Elastic sheet punching device and elastic sheet punching system

Abstract

The elastic sheet punching device (1) is configured to make a first punch plate (13) approach the first punch plate (18) when an elastic sheet (2) is arranged on a first punch plate (18), and after the elastic sheet (2) is clamped between a first stripper plate (15) and the first punch plate (18), the elastic sheet (2) is punched out by a punch portion (12) protruding from the first stripper plate (15). A stripper plate side recess (27) and a punch plate side recess (28) are provided on the stripper plate surface (15a) and the first punch plate surface (18a) to define a space (29) of a transfer shape to which the shape of the elastic sheet (2) is transferred when the stripper plate surface (15a) and the first punch plate surface (18a) are in contact.

Description

Technical Field

[0001] The present invention relates to an elastic sheet punching device for punching an elastic sheet arranged on a punch plate by a punch of a punch plate, and also to an elastic sheet punching system for punching an elastic sheet by the elastic sheet punching device to manufacture an annular seal. Background Art

[0002] Patent document 1 describes a punching device for manufacturing a product by punching a plate-shaped workpiece with a punch head. The punching device of the document comprises: a punch component having a punch head; a stripper plate having a through hole through which the punch head can pass in the up-down direction and supported by the punch component in a state that it can move in the up-down direction; and a force applying component that applies force to the stripper plate toward the lower end position of the moving range. In addition, the punching device comprises a die, which is located below the stripper plate and has a hole portion that can receive the front end portion of the punch head at a position overlapping with the punch head when viewed from the up-down direction. The surface of the stripper plate and the surface of the die facing each other in the up-down direction are flat surfaces.

[0003] If the workpiece is placed on the surface of the die, the punching device performs a punching action to bring the punch member close to the die from above. Thus, first, the workpiece is clamped between the stripper plate and the die. Furthermore, if the punch member further approaches the die, the punch head protruding downward from the stripper plate punches the workpiece on the die, and the front end of the punch head is in a state of being inserted into the hole. Thereafter, the punch member separates upward from the die and returns to the original standby position. According to the punching device of the document, the workpiece is punched while being clamped by the stripper plate and the die. Therefore, during punching, the workpiece does not move on the die.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Publication No. 58-25946 Summary of the invention

[0007] Technical problem to be solved by the invention

[0008] Annular seals such as O-rings are manufactured by punching out an elastic sheet made of an elastomer. Here, when the punching out of the elastic sheet is performed using the punching device described above, the elastic sheet is crushed and deformed when it is clamped by the stripper plate and the punching die. If the elastic sheet is deformed before punching out, there is a problem that the punch head contacts a portion different from the portion to be punched out and damages that portion.

[0009] In addition, when the elastic sheet is punched out by the punching device described above, the elastic sheet may sometimes adhere to the punch portion during punching, causing the punch portion to pull the peripheral portion of the punched portion of the elastic sheet into the hole portion after punching. In this case, the peripheral portion of the punched portion of the elastic sheet is deformed and enters the gap between the punch portion and the inner peripheral wall surface of the hole portion. Therefore, scratches and the like may sometimes be formed on the peripheral portion of the punched portion. In addition, if the elastic sheet is pulled into the hole portion more, the deformation of the elastic sheet becomes larger, and therefore, a break may sometimes occur on the peripheral portion of the punched portion.

[0010] In view of the above, the technical problem of the present invention is to provide an elastic sheet punching device capable of preventing or suppressing deformation of an elastic sheet before and after punching. Another technical problem is to provide an elastic sheet punching system including such an elastic sheet punching device.

[0011] Technical solutions adopted to solve technical problems

[0012] In order to solve the above-mentioned problems, the present invention is an elastic sheet punching device, comprising: a punch plate, which has a plate portion and a punch portion protruding downward from the above-mentioned plate portion; a stripper plate, which has a through hole through which the above-mentioned punch portion can pass in the up-down direction and is supported by the above-mentioned plate portion in a state that it can move in the above-mentioned up-down direction; a force-applying member, which applies force to the above-mentioned stripper plate toward the lower end position of the lower end of its moving range; and a punch plate, which is located below the above-mentioned stripper plate and has a hole portion that can receive the front end portion of the punch portion at a position overlapping with the above-mentioned punch portion when viewed from the above-mentioned up-down direction, and if the above-mentioned punch plate is provided with an elastic sheet to be punched, the above-mentioned punch plate is contacted from above Near the above-mentioned punching plate, after the above-mentioned elastic sheet is clamped between the above-mentioned stripping plate and the above-mentioned punching plate, the above-mentioned elastic sheet is punched out by the above-mentioned punch head protruding from the above-mentioned stripping plate to the above-mentioned downward direction and the front end part of the punch head is inserted into the above-mentioned hole portion, and then the above-mentioned punch plate and the above-mentioned stripping plate are separated from the above-mentioned punching plate to the above-mentioned upward direction, and it is characterized in that the stripping plate surface of the above-mentioned stripping plate and the punching plate surface of the above-mentioned punching plate facing each other in the above-mentioned up and down directions are provided with stripping plate side recesses and punching plate side recesses, and when the above-mentioned stripping plate surface is abutted against the above-mentioned punching plate surface, the above-mentioned stripping plate side recesses and the punching plate side recesses divide a space of a transfer shape to which the shape of the above-mentioned elastic sheet is transferred.

[0013] In the present invention, the stripper plate and the punch plate that clamp the elastic sheet from the upper and lower directions during punching are provided with a stripper plate side recess and a punch plate side recess that divide a space of a transfer shape to which the shape of the elastic sheet is transferred when they are brought into contact. Therefore, when the elastic sheet is clamped between the stripper plate and the punch plate, the elastic sheet is accommodated in the space to which its own shape is transferred. Thus, it is possible to prevent or suppress the elastic sheet from being crushed and deformed before punching. Therefore, it is possible to prevent or suppress the first punch head from contacting a portion different from the portion of the elastic sheet to be punched.

[0014] In addition, when the stripper plate surface and the punch plate surface are in contact, the elastic sheet is embedded in the stripper plate side recess having a transfer shape corresponding to the shape of the upper surface of the elastic sheet, and is embedded in the punch plate side recess having a transfer shape corresponding to the shape of the lower surface of the elastic sheet. Therefore, the elastic sheet is in the following state: the deformation in the in-plane direction of the punch plate surface within the space divided between the stripper plate and the punch plate is restricted. Therefore, even if the elastic sheet adheres to the punch head when the punch head penetrates the elastic sheet, and the punch head intrudes into the hole portion and pulls the elastic sheet toward the hole portion, it is possible to prevent or suppress the elastic sheet from being pulled into the hole portion. That is, the deformation of the elastic sheet after the elastic sheet is punched can be prevented or suppressed.

[0015] In the present invention, the punch plate can be provided with a metal punch plate body and a fluorine-containing resin coating provided on the surface of the punch plate body, and the punch plate surface, the inner surface of the punch plate side recess, and the inner peripheral wall surface of the hole portion located radially outside the punch head portion when the punch head portion is inserted are covered with the coating. If the inner peripheral wall surface of the hole portion is covered with the fluorine-containing resin coating, it is easy to slide compared with the case where the inner peripheral wall surface of the hole portion is a metal surface. Therefore, when the punch head portion pulls the elastic sheet into the hole portion during punching, the elastic sheet slides on the inner peripheral wall surface of the hole portion. Thus, it is possible to prevent or suppress the speed of the punch head portion punching the elastic sheet from decreasing. Therefore, the elastic sheet can be punched out with high precision by the punch head portion. In addition, if the punch plate surface and the inner surface of the punch plate side recess are covered with the fluorine-containing resin coating, it is easy to slide compared with the case where these surfaces are metal surfaces. Therefore, when the elastic sheet is arranged on the punch plate side recess and the elastic sheet and the punch plate side recess are misaligned in the in-plane direction of the punch plate surface, the elastic sheet slides on the punch plate surface and the inner surface of the punch plate side recess, and is set in a state where its lower surface is embedded in the punch plate side recess. As a result, the elastic sheet is correctly arranged at a prescribed position on the punch plate. Therefore, when the elastic sheet is sandwiched between the punch plate and the stripper plate, the elastic sheet will not be crushed. In addition, the elastic sheet is correctly arranged at a prescribed position on the punch plate, so the elastic sheet can be correctly punched out by the punch head.

[0016] In the present invention, the punch plate can be provided with a punch plate body made of resin and a metal support plate supporting the punch plate body from below, and the punch plate surface, the inner surface of the punch plate side recess, and the inner peripheral wall surface of the hole portion located radially outside the punch head when the punch head portion is inserted are provided on the punch plate body. If the inner peripheral wall surface of the hole portion is provided on the punch plate body portion made of resin, it is easy to slide compared with the case where the inner peripheral wall surface of the hole portion is a metal surface. Therefore, when the punch head portion pulls the elastic sheet into the hole portion during punching, the elastic sheet slides on the inner peripheral wall surface of the hole portion. Thus, it is possible to prevent or suppress the speed of the punch head portion punching the elastic sheet from decreasing. Therefore, the elastic sheet can be punched out with high precision by the punch head portion. In addition, if the punch plate surface and the inner surface of the punch plate side recess are provided on the punch plate body portion made of resin, it is easy to slide compared with the case where these surfaces are metal surfaces. Therefore, when the elastic sheet is arranged on the punch plate side recess and the elastic sheet and the punch plate side recess are misaligned in the in-plane direction of the punch plate surface, the elastic sheet slides on the punch plate surface and the inner surface of the punch plate side recess, and is set in a state where its lower surface is embedded in the punch plate side recess. As a result, the elastic sheet is correctly arranged at a prescribed position on the punch plate. Therefore, when the elastic sheet is sandwiched between the punch plate and the stripper plate, the elastic sheet will not be crushed. In addition, the elastic sheet is correctly arranged at a prescribed position on the punch plate, so the elastic sheet can be correctly punched out by the punch head.

[0017] In the present invention, it is preferred that the surface of the punch plate and the inner surface of the recessed portion on the side of the punch plate are rough surfaces, and when the ten-point average roughness is set to D, the following conditional expression is satisfied: 5μm≤D≤20μm. If such a conditional expression is satisfied, the contact area between the surface of the punch plate and the inner surface of the recessed portion on the side of the punch plate and the elastic sheet is reduced. Here, when the ten-point average roughness D of each surface is lower than the lower limit of the conditional expression, the elastic sheet is easily attached to the punch plate, and thus, sometimes it is prevented from being taken out of the recessed portion on the side of the punch plate after punching. In addition, when the ten-point average roughness D of each surface is higher than the upper limit of the conditional expression, sometimes the elastic sheet is damaged due to the unevenness of each surface.

[0018] In the present invention, it can be configured that the front end portion of the punch portion includes a blanking portion and a column portion in sequence from the front end toward the upper side, and when viewed from the upper and lower directions, the column portion is located inside the blanking portion. Thus, when the front end portion of the punch portion is inserted into the hole portion of the punch plate, a gap is formed between the column portion and the inner peripheral wall surface of the hole portion. Therefore, even if the blanking portion pulls the elastic sheet into the hole portion when the front end portion of the punch portion intrudes into the hole portion, it is possible to prevent the elastic sheet from being closely attached to the column portion and the punch portion from further pulling the elastic sheet into the depth of the hole portion. Therefore, it is possible to prevent or suppress the elastic sheet from being damaged.

[0019] In the present invention, the front end surface of the punch head is preferably a rough surface. In this way, the contact area between the front end surface of the punch head and the elastic sheet can be reduced. Therefore, it is possible to prevent the punched portion of the elastic sheet from being attached to the front end surface of the punch head without falling off, and from moving upward together with the punch plate after punching.

[0020] In the present invention, the punch portion can be made of resin. This makes it easier to slide the punch portion than when the punch portion is made of metal. Therefore, it is easier to prevent the punch portion from pulling the elastic sheet into the hole.

[0021] In the present invention, it can be arranged that the punch portion has a central protrusion protruding toward the lower side more than the outer peripheral edge of the front end face at the center of the front end face, and the front end of the central protrusion is a plane perpendicular to the axis of the punch portion. In this way, when the punch portion contacts the portion of the elastic sheet to be punched, the plane of the front end of the central protrusion presses the portion of the elastic sheet to be punched and causes elastic deformation. Therefore, after being punched by the punch portion, the punched portion of the elastic sheet returns to its original shape by its own elastic restoring force. As a result, the punched portion of the elastic sheet is easily peeled off from the front end face of the punch portion. Therefore, it is possible to prevent the punched portion of the elastic sheet from sticking to the punch portion and not falling off, and from moving upward together with the punch plate after punching.

[0022] In the present invention, it can be configured to include: a lifting mechanism that lifts the punch plate between a standby position where the stripper plate separates from the punch plate surface toward the upper side and a punching end position where the front end portion of the punch head is inserted into the hole; and a punching control unit that drives and controls the lifting mechanism, and the punching control unit sets a second speed that returns the punch plate from the punching end position to the standby position to be slower than a first speed that moves the punch plate from the standby position to the punching end position. In this way, after the elastic sheet is punched, the moving speed of the stripper plate when it separates from the elastic sheet toward the upper side becomes slower. Therefore, it is possible to prevent or inhibit the elastic sheet from being pulled by the stripper plate that separates from the punch plate toward the upper side. Therefore, it is possible to prevent or inhibit the elastic sheet from moving on the first punch plate.

[0023] In the present invention, the surface of the stripper plate and the inner surface of the recessed portion of the stripper plate are preferably rough surfaces. In this way, the contact area between the elastic sheet and the stripper plate can be reduced. Therefore, when the stripper plate is separated upward from the punch plate, the elastic sheet can be prevented or suppressed from sticking to the stripper plate.

[0024] In the present invention, it can be configured to have a recovery mechanism for recovering the punched portion punched from the elastic sheet, the recovery mechanism having: a recovery box, which is arranged below the punch plate and connected to the hole; an air suction mechanism, which has an air suction port connected to the recovery box; and an air suction mechanism control unit, which drives and controls the air suction mechanism, and the air suction mechanism control unit drives the air suction mechanism during the period when the stripper plate is in contact with the punch plate. In this way, when the punch head punches the elastic sheet, an air flow toward the recovery box side is generated between the radially outer surface of the front end portion of the punch head and the inner circumferential wall surface of the hole portion. Thereby, it is possible to prevent or suppress the situation where the punched portion of the elastic sheet after being punched by the punch head sticks to the punch head and does not fall off. In addition, through the air flow toward the recovery box side, it is easy to recover the punched portion that falls off from the punch head to the recovery box.

[0025] In the present invention, it is preferred to have an elastic sheet removing mechanism that blows the elastic sheet disposed in the side recess of the punch plate outward from the punch plate. In this way, the elastic sheet disposed in the side recess of the punch plate can be removed from the punch plate in a manner that does not move on the surface of the punch plate after the punching is completed.

[0026] In the present invention, the elastic sheet may be made of an elastomer.

[0027] Next, the elastic sheet punching system of the present invention is characterized in that it comprises: the above-mentioned elastic sheet punching device; and an elastic sheet conveying device, which conveys the above-mentioned elastic sheet from the retention position where the above-mentioned elastic sheet is retained to the above-mentioned punching template side recess of the above-mentioned elastic sheet punching device, the above-mentioned retention position is set in a temperature tank, and the above-mentioned temperature tank has a temperature regulating mechanism for regulating the temperature in the tank.

[0028] Compared with iron and aluminum wires, elastic sheets have a higher coefficient of thermal expansion and their dimensions change greatly due to temperature. Therefore, sometimes the dimensions of the elastic sheets change from the designed dimensions depending on the temperature state of the environment in which the elastic sheet punching device is installed. Here, in order to embed the elastic sheet into the side recess of the punch plate, it is desired to make the elastic sheet consistent with the designed dimensions before the elastic sheet is supplied to the elastic sheet punching device. In contrast, in the elastic sheet punching system of the present invention, the elastic sheet is retained at a retention position set in a temperature tank having a temperature regulating mechanism before being supplied to the elastic sheet punching device. Therefore, by adjusting the temperature in the tank, the elastic sheet can be made consistent with the designed dimensions.

[0029] In addition, another form of the elastic sheet punching system of the present invention is characterized in that it has a first elastic sheet punching device and a second elastic sheet punching device as the above-mentioned elastic sheet punching device, and is equipped with: a first elastic sheet conveying device, which supplies the above-mentioned elastic sheet at a predetermined supply position to the above-mentioned punching plate of the above-mentioned first elastic sheet punching device, that is, the above-mentioned punching plate side recess of the first punching plate; and a second elastic sheet conveying device, which moves the above-mentioned elastic sheet on the above-mentioned first punching plate to the above-mentioned punching plate of the above-mentioned second elastic sheet punching device, that is, the above-mentioned punching plate side recess of the second punching plate. The punch head of the first elastic sheet punching device, i.e., the first punch head, and the punch head of the second elastic sheet punching device, i.e., the second punch head, have different contour shapes when viewed from the above-mentioned upper and lower directions. The above-mentioned elastic sheet comprises: an annular product portion that becomes an annular seal by punching and a burr portion other than the above-mentioned annular product portion. The first elastic sheet punching device punches out the inner burr portion of the inner side of the above-mentioned annular product portion in the burr portion by the above-mentioned first punch head, and the second elastic sheet punching device punches out the above-mentioned annular product portion by the above-mentioned second punch head.

[0030] In the elastic sheet punching system of the present invention, when manufacturing an annular seal, first, the inner burr portion of the elastic sheet is punched out by the first elastic sheet punching device. Next, the elastic sheet is transported from the first elastic sheet punching device to the second elastic sheet punching device. Thereafter, the annular product portion of the elastic sheet is punched out by the second elastic sheet punching mechanism. According to the present invention, in the first elastic sheet punching device, deformation of the elastic sheet before and after punching can be prevented or suppressed. Therefore, when the inner burr portion is punched out by the first elastic sheet punching device, the first punch head contacts the annular product portion located on the outer peripheral side of the inner burr portion and damages the annular product portion can be prevented or suppressed. In addition, the first punch head can be prevented or suppressed from pulling the annular product portion toward the hole side, forming abrasions and fractures on the annular product portion. Therefore, when the annular product portion is manufactured by two punchings using two elastic sheet punching devices, damage to the annular product portion that becomes the seal can be prevented or suppressed. In addition, in the second elastic sheet punching device, deformation of the elastic sheet during punching is prevented or suppressed. Therefore, the second elastic sheet punching device can punch out the annular product portion that will become the seal with high accuracy.

[0031] In the present invention, it can be configured that the above-mentioned first elastic sheet conveying device comprises: a first adsorption portion, which comprises a first adsorption surface and a first air suction port arranged on the first adsorption surface; a first air suction mechanism, which is connected to the above-mentioned first air suction port; a first adsorption portion moving mechanism, which moves the above-mentioned first adsorption portion; and a first conveying control portion, which drives and controls the above-mentioned first air suction mechanism and the above-mentioned first adsorption portion moving mechanism, the above-mentioned first conveying control portion makes the above-mentioned first adsorption surface and the above-mentioned elastic sheet in the predetermined above-mentioned supply position separated by a gap and facing each other, drives the above-mentioned first air suction mechanism to adsorb the above-mentioned elastic sheet to the first adsorption surface, and moves the above-mentioned first adsorption portion to configure the above-mentioned first adsorption surface above the above-mentioned recessed portion on the above-mentioned punching plate side of the above-mentioned first punching plate, and stops the above-mentioned first air suction mechanism.

[0032] In this way, the first adsorption portion does not attract the elastic sheet to the first adsorption surface while the first adsorption surface is pressed against the elastic sheet, but attracts the elastic sheet in the supply position upward and adsorbs it to the first adsorption surface while the first adsorption surface is separated from the elastic sheet. Therefore, the first adsorption surface is not pressed against the elastic sheet when the elastic sheet is adsorbed to the first adsorption surface. Therefore, the elastic sheet can be prevented from being deformed. In addition, the elastic sheet can be prevented from sticking to the first adsorption surface. Furthermore, the situation in which the elastic sheet is charged due to friction can be prevented or suppressed. Therefore, the situation in which the elastic sheet sticks to the first adsorption surface due to being charged can be prevented. As a result, when the first suction mechanism is stopped, the elastic sheet is easily separated from the first adsorption surface, and therefore, the elastic sheet is easily arranged in the plate side recess of the first punching plate.

[0033] In the present invention, it can be configured that the burr portion includes: a frame-shaped burr portion provided along the outer peripheral edge of the elastic sheet throughout the entire circumference, the annular product portion is located on the inner peripheral side of the frame-shaped burr portion, and the second elastic sheet conveying device includes: a second suction portion, which includes a second suction surface and a second suction port provided on the second suction surface; a second suction mechanism, which is connected to the second suction port; a second suction portion moving mechanism, which moves the second suction portion; and a second conveying control portion, which controls the second suction mechanism and the second suction portion The moving mechanism is driven and controlled, and the second conveying control unit makes the second adsorption surface and the elastic sheet arranged on the punch plate side recess of the first punch plate separated by a gap and facing each other, drives the second suction mechanism to adsorb the elastic sheet to the second adsorption surface, and moves the second adsorption unit to make the second adsorption surface located above the punch plate side recess of the second punch plate, and then stops the second suction mechanism, and the second suction port is provided in the second adsorption surface in a frame-shaped opposing area facing the frame-shaped burr portion.

[0034] In this way, the second adsorption part does not attract the elastic sheet to the second adsorption surface while pressing the second adsorption surface to the elastic sheet, but attracts the elastic sheet in the punching plate recess of the first punching plate upward and adsorbs it to the second adsorption surface while separating the second adsorption surface from the elastic sheet. Therefore, when the elastic sheet is adsorbed to the second adsorption surface, the second adsorption surface is not pressed to the elastic sheet. Therefore, the elastic sheet can be prevented from being deformed. In addition, the elastic sheet can be prevented from being attached to the second adsorption surface. In addition, the situation that the elastic sheet is charged due to friction can be prevented or suppressed. Therefore, the situation that the elastic sheet is attached to the second adsorption surface due to charging can be prevented. Therefore, when the second suction mechanism is stopped, the elastic sheet is easily separated from the second adsorption surface, so it is easy to arrange the elastic sheet in the plate side recess of the second punching plate. In addition, in the second elastic sheet conveying device, the second suction port is provided in the second adsorption surface in the opposing area facing the frame-shaped burr portion of the elastic sheet. Therefore, the second adsorption part can attract the outer peripheral edge portion of the elastic sheet to the second adsorption surface throughout the entire circumference. Therefore, even if a hole punched by the first elastic sheet punching device is formed on the inner peripheral side of the frame-shaped burr portion of the elastic sheet, the second suction portion can suck the elastic sheet. In addition, when the second suction portion sucks the outer peripheral edge portion of the elastic sheet over the entire circumference, the sucked elastic sheet can be prevented or suppressed from being bent. Therefore, the elastic sheet can be correctly arranged in the plate side recess of the second punching plate.

[0035] Effects of the Invention

[0036] According to the present invention, when the elastic sheet is clamped between the punch plate and the stripper plate during punching, it is accommodated in the space to which its own shape is transferred. Therefore, it is possible to prevent or suppress the elastic sheet from being crushed and deformed before punching. In addition, by accommodating the elastic sheet in the space to which its own shape is transferred, the deformation in the in-plane direction of the punch plate surface is limited or suppressed. Therefore, even if the punch head pulls the elastic sheet toward the hole portion during punching, it is possible to prevent or suppress the elastic sheet from being pulled toward the hole portion after punching. Therefore, it is possible to prevent or suppress the elastic sheet from being deformed after the elastic sheet is punched.

[0037] In addition, according to the elastic sheet punching system of the present invention, the first punching device can prevent or suppress the annular product portion located around the punched portion from being damaged. In addition, the second punching device can punch the annular product portion with high accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is the front view of the elastic sheet blanking system.

[0039] Figure 2 This is a top view of the elastic sheet punching system as viewed from above.

[0040] Figure 31 and 2 are a top view and a cross-sectional view of the elastic sheet.

[0041] Figure 4 It is an explanatory diagram of the first elastic sheet punching device.

[0042] Figure 5 This is an explanatory diagram of the first elastic sheet punching device immediately before punching the elastic sheet.

[0043] Figure 6 This is an explanatory diagram of the first elastic sheet punching device immediately after punching out the elastic sheet.

[0044] Figure 7 It is an explanatory diagram of the first punch portion of the first elastic sheet punching device.

[0045] Figure 8 It is an explanatory diagram of the second punch portion of the second elastic sheet punching device.

[0046] Fig. 9 This is an explanatory diagram of the supply mechanism.

[0047] Fig.10 It is an explanatory diagram of the elastic sheet moving mechanism and the conveying mechanism.

[0048] Fig.11 It is a three-dimensional diagram of the workbench and the positioning mechanism.

[0049] Fig.12 It is an explanatory diagram of the second elastic sheet conveying device.

[0050] Fig.13 It is a flow chart of the operation of the elastic sheet punching system.

[0051] Fig.14 It is an explanatory diagram of a punching plate of a modified example.

[0052] Fig.15 This is an explanatory diagram of the suction unit according to Modification 1.

[0053] Fig.16 This is an explanatory diagram of the suction unit of Modification Example 2. DETAILED DESCRIPTION

[0054] Hereinafter, an elastic sheet punching system to which the present invention is applied will be described with reference to the drawings.

[0055] (Overall structure)

[0056] Figure 1 It is the front view of the elastic sheet blanking system. Figure 2 This is an explanatory diagram when the elastic sheet punching system is viewed downward from a predetermined height. Figure 2 is from Figure 1 Observe the situation below by looking at the height position of the JJ line. Figure 3(a) is a top view of the elastic sheet. Figure 3 (b) is Figure 3 The elastic sheet punching system 1 of this example punches out the elastic sheet 2 in sequence by two elastic sheet punching devices 3 and 4 to produce an annular seal such as an O-ring.

[0057] like Figure 1 As shown, the elastic sheet punching system 1 includes: a first elastic sheet punching device 3 for punching the elastic sheet 2; and a second elastic sheet punching device 4 for further punching the elastic sheet 2 punched by the first elastic sheet punching device 3. In addition, the elastic sheet punching system 1 includes: a first elastic sheet conveying device 5 for supplying the elastic sheet 2 to the first elastic sheet punching device 3; and a second elastic sheet conveying device 6 for conveying the elastic sheet 2 from the first elastic sheet punching device 3 to the second elastic sheet punching device 4. In addition, the elastic sheet punching system 1 includes a control unit 7 for cooperatively driving the first elastic sheet punching device 3, the second elastic sheet punching device 4, the first elastic sheet conveying device 5, and the second elastic sheet conveying device 6.

[0058] The first elastic sheet punching device 3 and the second elastic sheet punching device 4 are arranged in one direction. Here, the arrangement direction of the first elastic sheet punching device 3 and the second elastic sheet punching device 4 is referred to as the X direction, the direction perpendicular to the X direction is referred to as the Y direction, and the direction perpendicular to the X direction and the Y direction is referred to as the Z direction. The Z direction is the up-down direction. In addition, in the X direction, the side where the second elastic sheet punching device 4 is located is referred to as the X1 direction, and the opposite side thereof is referred to as the X2 direction. One side of the Y direction is referred to as the Y1 direction, and the other side is referred to as the Y2 direction. In addition, the lower side is referred to as the Z1 direction, and the upper side is referred to as the Z2 direction.

[0059] (Elastic sheet)

[0060] like Figure 3 As shown, the outline shape of the elastic piece 2 when viewed from the thickness direction is a square. The outline of the elastic piece 2 includes: a first side 58a and a second side 58b extending in parallel to each other; and a third side 58c and a fourth side 58d extending in parallel to each other and in a direction orthogonal to the first side 58a and the second side 58b. In addition, there is also a case where the elastic piece 2 has a hexagonal shape. In this case, the elastic piece 2 includes: a first side 58a and a second side 58b extending in parallel to each other; a third side 58c and a fourth side 58d extending in parallel to each other and in a direction orthogonal to the first side 58a and the second side 58b; a fifth side extending in a direction intersecting the first side 58a and the third side 58c and connecting the first side 58a and the third side 58c; and a sixth side facing the fifth side and connecting the second side 58b and the fourth side 58d.

[0061] In addition, the elastic sheet 2 includes a plurality of annular product portions 60 that form an annular seal and a burr portion 61 excluding the plurality of annular product portions 60. The plurality of annular product portions 60 are arranged in a matrix at the central portion of the elastic sheet 2. When viewed from the thickness direction, each annular product portion 60 is annular. A cross section of each annular product portion 60 cut along the thickness direction along a portion of the circumference thereof is circular.

[0062] The burr portion 61 includes a frame-shaped burr portion 61a provided along the outer peripheral edge of the elastic sheet 2 over the entire circumference. The frame-shaped burr portion 61a is provided with a constant width. A plurality of annular product portions 60 are located on the inner peripheral side of the frame-shaped burr portion 61a. In addition, the burr portion 61 includes: an inner burr portion 61b located on the inner side of each annular product portion 60; and an outer burr portion 61c located on the inner peripheral side of the frame-shaped burr portion 61a and on the outer side of each annular product portion 60. The inner burr portion 61b has an annular inner protrusion protruding in the Z1 direction and the Z2 direction at a position adjacent to the annular product portion 60. The cross-sectional shape of the inner protrusion is rectangular, and the front end becomes thinner toward the Z1 direction and the Z2 direction. The outer burr portion 61c is continuous on the inner peripheral side of the frame-shaped burr portion 61a and is continuous with the frame-shaped burr portion 61a. The outer burr portion 61c includes an annular outer protrusion protruding in the Z1 direction and the Z2 direction at a position adjacent to the annular product portion 60. The outer protrusion has a rectangular cross-sectional shape and tapers toward the Z1 direction and the Z2 direction.

[0063] Here, the first elastic sheet punching device 3 punches the inner burr portion 61b from the elastic sheet 2. The second elastic sheet punching device 4 punches the annular product portion 60 from the elastic sheet 2 after the inner burr portion 61b is punched out. The annular product portion 60 punched out by the second elastic sheet punching device 4 becomes an annular seal. In this example, the seal is an O-ring.

[0064] The elastic sheet 2 is made of an elastomer. In this example, the elastic sheet 2 is made of a thermosetting elastomer. Thermosetting elastomers are elastic and easily bendable. In addition, thermosetting elastomers have adhesive properties. The linear expansion coefficient of thermosetting elastomers is 1×10 -4 / ℃~3×10 -4 / ℃. The linear expansion coefficient of thermosetting elastomer is 10 to 40 times larger than that of iron. Here, the elastic sheet 2 is manufactured by a rubber injection molding machine. That is, the elastic sheet 2 is molded by injecting a thermosetting elastomer into a mold at a predetermined molding temperature and applying pressure. The elastic sheet 2 has the same properties as the thermosetting elastomer. That is, the elastic sheet 2 has elasticity and adhesion. In addition, the linear expansion coefficient of the elastic sheet 2 is 10 to 40 times larger than that of iron.

[0065] (First elastic sheet punching device)

[0066] Figure 4It is an explanatory diagram of the first elastic sheet punching device 3 . Figure 4 In the process, the punch plate is in the standby position. Figure 5 It is an explanatory diagram of the first elastic sheet punching device 3 immediately before punching the elastic sheet. Figure 6 This is an explanatory diagram of the first elastic sheet punching device 3 immediately after the elastic sheet is punched out by the first punch portion. Figure 7 It is an explanatory diagram of the first punch portion.

[0067] like Figure 4 As shown, the first elastic sheet blanking device 3 has a first punch plate 13, and the first punch plate 13 includes a first plate portion 11 and a first punch portion 12 protruding from the first plate portion 11 in the Z1 direction. In addition, the first elastic sheet blanking device 3 includes: a first stripper plate 15 supported by the first plate portion 11 in a state that can move in the Z direction. The first stripper plate 15 includes: a first through hole 16 that allows the first punch portion 12 to pass through in the Z direction. The first stripper plate 15 is located at a lower end position 15A at the end of the Z1 direction of its moving range and an upper side position 15B (refer to Figure 5 , Figure 6 ) between the lower end position 15A and the lower end position 15A.

[0068] In addition, the first elastic sheet punching device 3 has a first punching plate 18 located in the Z1 direction of the first stripping plate 15. Figure 2 As shown, the first punch plate 18 includes a first hole 19 capable of receiving the front end portion 14 of the first punch portion 12 at a position overlapping the first punch portion 12 when viewed from the Z direction.

[0069] And, if Figure 1 As shown, the first elastic sheet punching device 3 has a first lifting mechanism 21 for lifting and lowering the first punch plate 13. The first lifting mechanism 21 lifts and lowers the first punch plate 13 between a standby position 13A where the first stripper plate 15 is separated from the punch plate surface 18a in the Z2 direction and a punching end position 13B where the front end portion 14 of the first punch head 12 is inserted into the first hole portion 19. Figure 4 The state shown is a state where the first punch plate 13 is arranged at the standby position 13A. Figure 6 The illustrated state is a state where the first punch plate 13 is arranged at the punching end position 13B.

[0070] The first punch portion 12 punches out the inner burr portion 61b from the elastic sheet 2. Figure 4 As shown, the first punch portion 12 protrudes from the first plate portion 11 in the Z1 direction. Figure 7As shown, in the first punch portion 12, the front end portion 14 of the first hole portion 19 that penetrates the first punch plate 18 when punching the elastic sheet 2 is provided with a punching portion 25 and a column portion 26 in sequence from the front end toward the Z2 direction. When viewed from the Z direction, the punching portion 25 and the column portion 26 are circular. When viewed from the Z direction, the column portion 26 is located on the inner side of the punching portion 25. In this example, the column portion 26 is coaxial with the punching portion 25, and the column portion 26 has a smaller outer diameter than the punching portion 25.

[0071] The front end face 12a of the first punch portion 12, i.e., the front end face 12a of the blanking portion 25, has an annular protrusion 25a protruding in the Z1 direction at the outer periphery. In addition, the front end face 12a of the blanking portion 25 has a central protrusion 25b protruding in the Z1 direction at the central portion. The central protrusion 25b has a truncated cone shape. The front end of the central protrusion 25b is a plane perpendicular to the axis of the first punch portion 12 extending in the Z direction. The annular protrusion 25a and the central protrusion 25b are separated in the radial direction. An annular recess is formed between the annular protrusion 25a and the central protrusion 25b in the radial direction. The central protrusion 25b protrudes in the Z1 direction more than the annular protrusion 25a.

[0072] In this example, the first punch portion 12 is made of a conductive metal. The entire surface of the front end portion 14 of the first punch portion 12 is subjected to sandblasting. As a result, the front end surface 12a of the first punch portion 12 becomes a rough surface. When the ten-point average roughness is set to P, the front end surface 12a of the first punch portion 12 satisfies the following conditional expression (1).

[0073] 5μm≤P≤20μm··(1)

[0074] Here, P more preferably satisfies the following conditional formula (2).

[0075] 8μm≤P≤12μm··(2)

[0076] In this example, P=10 μm, satisfying conditional expressions (1) and (2).

[0077] Secondly, the first stripping plate 15 is made of a conductive metal. Figure 4 As shown, when the punch plate 13 is arranged at the standby position 13A, the front end portion 14 of the first punch portion 12 is inserted into each first through hole 16 of the first stripper plate 15. The first force applying member 17 is four coil springs arranged between the four corners of the first plate portion 11 and the four corners of the first stripper plate 15. Figure 4 As shown in FIG. 1 , when the first stripper plate 15 is at the lower end position 15A, the front end of the central protrusion 25b of the front end surface 12a of the first punch portion 12 protrudes from the lower surface of the first stripper plate 15, i.e., the stripper plate surface 15a, in the Z1 direction. Figure 5As shown, when the stripper plate surface 15a contacts the punch plate 18, the front end of the central protrusion 25b of the first punch head 12 contacts the inner burr portion 61b of the elastic sheet 2 located on the punch plate 18. Figure 6 As shown, when the first stripper plate 15 is in the upper position 15B, the front end portion 14 of the first punch portion 12 protrudes from the stripper plate surface 15a in the Z1 direction.

[0078] Here, if Figure 4 As shown, the stripper plate surface 15a is provided with a stripper plate side recess 27. The stripper plate surface 15a and the inner surface 27a of the stripper plate side recess 27 are rough surfaces. When the ten-point average roughness is set to S, the stripper plate surface 15a and the inner surface 27a of the stripper plate side recess 27 satisfy the following conditional expression (3).

[0079] 5μm≤S≤40μm··(3)

[0080] Here, it is more preferable that S satisfies the following conditional expression (4).

[0081] 8μm≤S≤12μm··(4)

[0082] In this example, S=10 μm, satisfying conditional expressions (3) and (4).

[0083] The first punch plate 18 has a punch plate side recess 28 on the punch plate surface 18a as the upper surface thereof. The punch plate side recess 28 is formed at the first punching position A where the elastic sheet 2 to be punched is arranged. Figure 5 As shown, when the stripper plate surface 15a is brought into contact with the punch plate surface 18a, the punch plate side recess 28 faces the stripper plate side recess 27. In addition, between the first stripper plate 15 and the first punch plate 18, the punch plate side recess 28 and the stripper plate side recess 27 define a transfer shape space 29 to which the shape of the elastic sheet 2 is transferred.

[0084] Here, if Figure 4 As shown in the figure, the first punch plate 18 includes a first punch plate body 31 made of conductive metal and a first coating 32 of fluorine-containing resin provided on the surface of the first punch plate body 31. The first coating 32 is a PTFE-containing nickel plating layer, a Teflon (registered trademark) coating, etc. As a result, the punch plate surface 18a, the inner surface 28a of the punch plate side recess 28, and the inner peripheral wall surface 19a of the first hole portion 19 located radially outside the front end portion 14 when the punch head 12 is inserted are covered by the first coating 32.

[0085] The die plate surface 18a and the inner surface 28a of the die plate side recess 28 are rough surfaces. That is, the surface of the first coating 32 of these surfaces is a rough surface. When the ten-point average roughness is set to D, the die plate surface 18a and the inner surface 28a of the die plate side recess 28 satisfy the following conditional expression (5).

[0086] 5μm≤D≤40μm··(5)

[0087] Here, D more preferably satisfies the following conditional formula (6).

[0088] 8μm≤D≤12μm··(6)

[0089] In this example, D=10 μm, satisfying conditional expressions (5) and (6).

[0090] Secondly, if Figure 1 As shown, the first elastic sheet punching device 3 includes a first punching control unit 22 for driving and controlling the first lifting mechanism 21. When the first punching control unit 22 drives the first lifting mechanism 21 to lift the first punch plate 13, the first punch plate 13 is returned from the punching end position 13B to the standby position 13A at a second speed V2 (see Figure 6 ) is set to be faster than the first speed V1 (refer to Figure 4 , Figure 5 )slow.

[0091] In addition, the first elastic sheet punching device 3 includes a first recovery mechanism 23 for recovering the inner burr portion 61b punched by the first punch portion 12. Figure 4 As shown, the first recovery mechanism 23 includes: a first recovery box 24, which is arranged in the Z1 direction of the first punch plate 18 and communicated with the first hole portion 19; and a first suction mechanism 34, which includes a first suction port 34a communicated with the first recovery box 24. Figure 1 As shown, the first elastic sheet punching device 3 includes a first suction mechanism control unit 35 that controls the driving of the first suction mechanism 34. The first suction mechanism control unit 35 drives the suction mechanism 34 while the first stripper plate 15 and the first punch plate 18 are in contact.

[0092] Here, if Figure 1 As shown, the first elastic sheet punching device 3 includes a first control unit 10 for managing the operation of the first elastic sheet punching device 3. The first control unit 10 is provided integrally with or in a communicative manner with the control unit 7 of the elastic sheet punching system 1. The first punching control unit 22 and the first suction mechanism control unit 35 of the first recovery mechanism 23 are provided in the first control unit 10.

[0093] like Figure 4As shown, if the elastic sheet 2 to be punched is arranged on the first punch plate 18, the first punching control unit 22 makes the first punch plate 13 approach the first punch plate 18. Thus, the first elastic sheet punching device 3 makes the first stripper plate 15 contact the first punch plate 18 and clamp the elastic sheet 2 therebetween (see Figure 5 ). Thereafter, when the first punch plate 13 further approaches the first punch plate 18, the first elastic sheet punching device 3 punches the elastic sheet 2 by the first punch portion 12 protruding from the first stripper plate 15 in the Z1 direction, and inserts the front end portion 14 of the first punch portion 12 into the first hole portion 19 (refer to Figure 6 Then, the first elastic sheet punching device 3 moves the first punch plate 13 in the Z2 direction. As a result, the first punch plate 13 and the first stripper plate 15 are separated from the first punch plate 18 in the Z2 direction to form Figure 4 The inner burr portion 61 b ​​punched out by the first punch portion 12 is recovered by the first recovery mechanism 23 .

[0094] (Second elastic sheet punching device)

[0095] Figure 8 1 is an explanatory diagram of the shape of the front end portion 14 of the punch head 12 of the second elastic sheet punching device 4. The second elastic sheet punching device 4 has a structure corresponding to the first elastic sheet punching device 3. Therefore, in the description of the second elastic sheet punching device 4, the same reference numerals are attached to the structures corresponding to the second elastic sheet punching device 4, and the description thereof is omitted. In addition, in the description of the second elastic sheet punching device 4, the same as the description of the first elastic sheet punching device 3, the reference numerals are used. Figure 4 , Figure 5 , Figure 6 .

[0096] like Figure 4 As shown, the second elastic sheet blanking device 4 has a second punch plate 13, and the second punch plate 13 includes a second plate portion 11 and a second punch portion 12 protruding from the second plate portion 11 in the Z1 direction. In addition, the second elastic sheet blanking device 4 has: a second stripper plate 15 supported by the second plate portion 11 in a state that can move in the Z direction. In addition, the second elastic sheet blanking device 4 has a second force applying member 17 that applies force to the second stripper plate 15 toward the lower end position 15A. The second force applying member 17 is four coil springs. In addition, the second elastic sheet blanking device 4 has a second punch plate 18 located in the Z1 direction of the second stripper plate 15. And, as shown Figure 1 As shown, the second elastic sheet punching device 4 has a second lifting mechanism 21 for lifting and lowering the second punch plate 13. The second lifting mechanism 21 lifts and lowers the second punch plate 13 between a standby position 13A where the second stripper plate 15 is separated from the punch plate surface 18a in the Z2 direction and a punching end position 13B where the front end portion 14 of the second punch head 12 is inserted into the second hole portion 19.

[0097] The second punch portion 12 punches out the annular product portion 60 from the elastic sheet 2. Figure 8 As shown, the second punch portion 12 is cylindrical. The outer diameter of the second punch portion 12 is larger than the outer diameter of the blanking portion 25 of the first punch portion 12, and the front end face 12a of the second punch portion 12 is circular and is a tapered surface inclined in the Z2 direction from the outer peripheral edge toward the inner peripheral side. The front end face 12a is inclined at 30 degrees in the Z2 direction relative to a plane orthogonal to the central axis of the punch portion. In this example, the second punch portion 12 is made of a conductive metal. In addition, the front end face 12a of the second punch portion 12 is subjected to sandblasting. As a result, the front end face 12a of the second punch portion 12 becomes a rough surface. When the ten-point average roughness of the front end face 12a of the second punch portion 12 is set to P, P=10μm, which satisfies the above-mentioned conditional expressions (1) and (2).

[0098] The second stripper plate 15 is made of a conductive metal. In addition, the second stripper plate 15 has a second through hole 16 through which the second punch portion 12 can pass in the Z direction. The inner diameter of the second through hole 16 is larger than the inner diameter of the first through hole 16 of the first stripper plate 15. The tip portion 14 of the second punch portion 12 is inserted into each second through hole 16. When the second stripper plate 15 is in the upper position 15B, the tip portion 14 of the second punch portion 12 protrudes from the stripper plate surface 15a in the Z1 direction.

[0099] The stripper plate surface 15a is provided with a stripper plate side recess 27. The stripper plate surface 15a and the inner surface 27a of the stripper plate side recess 27 are rough surfaces. When the ten-point average roughness of the stripper plate surface 15a and the inner surface 27a of the stripper plate side recess 27 is denoted as S, S=10 μm, satisfying the above-mentioned conditional expressions (3) and (4).

[0100] The second punch plate 18 has a second hole 19 capable of receiving the second punch portion 12 on a punch plate surface 18a as its upper surface. The inner diameter of the second hole 19 is larger than the inner diameter of the first hole 19 of the first punch plate 18. Figure 4 Similar to the first punch plate 18 shown in the figure, a punch plate side recess 28 is provided in the punch plate surface 18a at the second punching position B where the elastic sheet 2 to be punched is arranged. Figure 5 In the same state as shown, when the stripper plate surface 15a of the second stripper plate 15 is brought into contact with the punch plate surface 18a of the second punch plate 18, the punch plate side recess 28 and the stripper plate side recess 27 face each other. In addition, between the second stripper plate 15 and the second punch plate 18, the punch plate side recess 28 and the stripper plate side recess 27 define a transfer shape space 29 to which the shape of the elastic sheet 2 is transferred.

[0101] Here, the second punch plate 18 includes: a second punch plate body 31 made of conductive metal and a second coating layer 32 of fluorine-containing resin provided on the surface of the second punch plate body 31. Thus, the punch plate surface 18a, the inner surface 28a of the punch plate side recess 28, and the inner peripheral wall surface 19a of the second hole 19 are covered by the second coating layer 32. In addition, the punch plate surface 18a and the inner surface 28a of the punch plate side recess 28 are rough surfaces. When the ten-point average roughness of the punch plate surface 18a and the inner surface 28a of the punch plate side recess 28 is D, D=10μm, and the above-mentioned conditional expressions (5) and (6) are satisfied. That is, the ten-point average roughness of the punch plate surface 18a and the inner surface 28a of the punch plate side recess 28 covered by the second coating layer 32 is 10μm.

[0102] Secondly, if Figure 1 As shown, the second elastic sheet punching device 4 has a second punching control unit 22 for driving and controlling the second lifting mechanism 21. When the second punching control unit 22 drives the second lifting mechanism 21 to lift the second punch plate 13, the second punch plate 13 is returned from the punching end position 13B to the standby position 13A at a second speed V2 (refer to Figure 6 ) is set to be faster than the first speed V1 (refer to Figure 4 , Figure 5 )slow.

[0103] In addition, the second elastic sheet punching device 4 has a second recovery mechanism 23 for recovering the annular product portion 60 punched by the second punch portion 12. Figure 4 As shown, the second recovery mechanism 23 includes: a second recovery box 24, which is arranged in the Z1 direction of the second punch plate 18 and communicated with the second hole portion 19; and a second suction mechanism 34, which includes a second suction port 34a communicated with the second recovery box 24. Figure 1 As shown, the second collecting mechanism 23 includes a second suction mechanism control unit 35 that drives and controls the second suction mechanism 34. The second suction mechanism control unit 35 drives the suction mechanism 34 while the second stripper plate 15 and the second punch plate 18 are in contact.

[0104] And, if Figure 1 As shown, the second elastic sheet punching device 4 includes: an elastic sheet removing mechanism 41 for blowing the elastic sheet 2 disposed on the die plate side recess 28 of the second die plate 18 outward from the second die plate 18. The elastic sheet removing mechanism 41 includes: a plurality of nozzles 42, which are located in the Z2 direction of the second die plate 18 and are arranged at positions separated from the second die plate 18 in the X2 direction; and an air supply pump 43, which is connected to the nozzles 42. In addition, the elastic sheet removing mechanism 41 includes an elastic sheet removing mechanism control unit 45 for driving and controlling the air supply pump 43.

[0105] The front end openings of the plurality of nozzles 42 face the end portion of the die plate side recess 28 in the X2 direction. When the punching of the elastic sheet 2 is completed and the second stripper plate 15 is separated from the second die plate 18 in the Z2 direction, the elastic sheet removal mechanism control unit 45 drives the air supply pump 43 to discharge compressed air from the nozzle 42. Thus, compressed air is blown obliquely from the Z2 direction from the nozzle 42 toward the end portion of the die plate side recess 28 in the X2 direction. As a result, the elastic sheet 2 arranged in the die plate side recess 28 flies out from the die plate side recess 28 in the Z2 direction toward the X1 direction and falls toward the second die plate 18 in the X1 direction. In addition, in the X1 direction of the second die plate 18, a recovery box (not shown) is arranged in order to recover the elastic sheet 2 after the annular product portion 60 is punched out.

[0106] Here, if Figure 1 As shown, the second elastic sheet punching device 4 includes a second control unit 40 for managing the operation of the second elastic sheet punching device 4. The second control unit 40 is provided integrally with or in a communicative manner with the control unit 7 of the elastic sheet punching system 1. The second punching control unit 22, the second suction mechanism control unit 35 of the second recovery mechanism 23, and the elastic sheet removal mechanism control unit 45 of the elastic sheet removal mechanism 41 are provided in the second control unit 40.

[0107] (First elastic sheet conveying device)

[0108] The first elastic sheet conveying device 5 includes a workbench 51 and a supply mechanism 52 for supplying the elastic sheet 2 to a loading area C. The loading area C is set on a workbench surface 51a of the workbench 51. Figure 2 As shown, the supply mechanism 52 includes a storage 53 for holding the elastic sheets 2 in a stacked state at a preset accumulation position E. In addition, the supply mechanism 52 includes an elastic sheet moving mechanism 54 for moving the elastic sheets 2 from the storage 53 to the stage 51 .

[0109] The first elastic sheet conveying device 5 is provided with a positioning mechanism 55 for positioning the elastic sheet 2 arranged in the loading area C of the table surface 51 a at the supply position D in the loading area C. The first elastic sheet conveying device 5 is provided with a conveying mechanism 56 for sucking and moving the elastic sheet 2 positioned at the supply position D, and for placing the elastic sheet 2 at the first punching position A of the first elastic sheet punching device 3 by releasing the suction.

[0110] Here, the workbench 51 is located in the X2 direction of the first elastic sheet punching device 3. The workbench 51, the first elastic sheet punching device 3, and the second elastic sheet punching device 4 are arranged in a row in the X direction. The workbench 51 and the storage 53 at the retention position E are arranged in the Y direction. The storage 53 is located in the Y1 direction of the workbench 51.

[0111] (Supply Agency)

[0112] Fig. 9 It is an explanatory diagram of the supply mechanism 52. Fig.10 (a) is a cross-sectional view of the adsorption portion of the elastic piece moving mechanism 54 . Fig.10 (b) is a perspective view of the adsorption portion of the elastic piece moving mechanism 54 when viewed from the Z1 direction. Fig.10 In (a), the state where the elastic sheet 2 is adsorbed by the adsorption portion is schematically shown. Fig. 9 As shown, in the storage 53, the elastic sheets 2 are stacked along the Z direction. The elastic sheet moving mechanism 54 moves the top elastic sheet 2 of the storage 53 to the loading area C (refer to FIG. 1 ) set on the workbench surface 51a of the workbench 51. Figure 2 )move.

[0113] like Fig. 9 As shown, the storage reservoir 53 includes a square tube portion 65 and a bottom plate portion 66 that closes the lower end opening of the square tube portion 65. The side plates of the square tube portion 65 that face each other in the X direction each have a slit 67 that extends in the Z direction. The elastic sheet 2 is stacked on the inner side of the square tube portion 65. The bottom plate portion 66 can be raised and lowered in the Z direction on the inner side of the square tube portion 65 by a lifting mechanism 68. Each time the elastic sheet moving mechanism 54 moves an elastic sheet 2, the lifting mechanism 68 raises the bottom plate portion 66 by a predetermined distance. The elastic sheet 2 is received in the storage reservoir 53 in a posture in which the first side 58a and the second side 58b are oriented in the X direction and the third side 58c and the fourth side 58d are oriented in the Y direction. Here, as shown in FIG. Figure 2 As shown, the retention position E is set in the temperature tank 70, and the temperature tank 70 has a temperature adjustment mechanism 70a for adjusting the temperature in the tank. Therefore, the storage 53 is located in the temperature tank 70. The elastic sheet 2 is retained in the temperature tank 70 for a predetermined time or longer.

[0114] like Figure 2 , Fig. 9 As shown, the elastic sheet moving mechanism 54 includes: a suction portion 73 including a suction surface 71 and an air suction port 72 provided on the suction surface 71; an air suction mechanism 74 connected to the air suction port 72; and a suction portion moving mechanism 75 that moves the suction portion 73 and the air suction mechanism 74.

[0115] like Fig. 9 As shown in FIG. 1 , the adsorption portion 73 includes a suction plate 81 having a rectangular shape when viewed from the Z direction. The suction plate 81 includes a cylindrical portion 82 protruding from its central portion in the Z2 direction. Fig.10As shown, the suction plate 81 has a square-shaped recess 83 in the central part of the lower surface. The size of the recess 83 when viewed from the Z direction is smaller than that of the elastic sheet 2. A communication port 84 is provided in the central part of the recess 83, which passes through the suction plate 81 in the Z direction. The communication port 84 is connected to the cylinder 82.

[0116] A sheet-like mesh member 85 is fixed to the lower surface of the suction plate 81. The mesh member 85 is rectangular and closes the recess 83 from below. In addition, a sheet-like frame 86 is attached to the outer periphery of the mesh member 85. In this example, the mesh member 85 is a metal mesh and has conductivity. The frame 86 uses crepe paper as a base material. More specifically, the frame 86 is formed by attaching a tape having a base material made of crepe paper and an adhesive layer provided on one surface of the base material to the outer periphery of the mesh member 85 in a frame shape. The surface of the tape, that is, the lower surface of the frame 86 is a rough surface. Here, the lower surface of the frame 86 and the lower surface of the mesh member 85 constitute the adsorption surface 71 for adsorbing the elastic sheet 2. Therefore, the adsorption surface 71 has a rough surface portion. In addition, the adsorption surface 71 has a conductive metal portion. The air inlet 72 provided on the adsorption surface 71 is a plurality of openings provided in the mesh member 85.

[0117] When the elastic sheet 2 is attracted to the suction surface 71, the frame portion 71a of the suction surface 71 formed by the frame body 86 contacts the outer peripheral edge of the elastic sheet 2. When the ten-point average roughness R is defined, the surface of the frame portion 71a satisfies the following conditional expression (7).

[0118] 8μm≤R··(7)

[0119] In this example, R=50 μm, which satisfies conditional expression (7).

[0120] like Fig. 9 As shown, the air intake mechanism 74 includes an ejector 88. The ejector 88 is a well-known structure including an air inlet 88a, a diffuser, a main body that communicates the diffuser with the air inlet 88a, and an airflow generating mechanism that causes a driving fluid to flow into the main body and generates an airflow from the air inlet 88a toward the diffuser. The air inlet 88a of the ejector 88 is connected to the cylinder 82 of the suction plate 81. Thus, the air inlet 88a of the ejector 88 is connected to the opening of the net member 85, that is, the air intake port 72, via the cylinder 82 of the suction plate 81, the communication port 84, and the recessed portion 83.

[0121] like Figure 1 As shown in FIG. 1 , the adsorption unit moving mechanism 75 includes: a support unit 91 that supports the adsorption unit 73 and a support unit moving mechanism 92 that moves the support unit 91 in the Y direction and the Z direction. The support unit moving mechanism 92 includes a driving source such as a motor. Figure 2 As shown, the suction unit moving mechanism 75 moves the suction unit 73 along a predetermined conveying path G1 that is set in advance.

[0122] Here, if Figure 1 As shown, the supply mechanism 52 includes a conveying control unit 93 for driving and controlling the suction mechanism 74 and the elastic sheet moving mechanism 54. The conveying control unit 93 is provided integrally with the control unit 7 of the elastic sheet punching system 1 or in a communication manner. When the conveying control unit 93 supplies the elastic sheet 2 from the storage 53 to the workbench 51, the conveying control unit 93 first drives and controls the adsorption unit moving mechanism 75 to move the adsorption unit 73 so that the adsorption surface 71 faces the elastic sheet 2 stacked on the storage 53 with a gap therebetween. Next, the conveying control unit 93 drives the suction mechanism 74 to suck up the elastic sheet 2 and adsorb it on the adsorption surface 71, and drives the adsorption unit moving mechanism 75 to move the adsorption unit 73 in the Y2 direction according to the prescribed conveying path G1. Thereafter, the conveying control unit 93 arranges the adsorption unit 73 at a position where its adsorption surface 71 faces the loading area C of the workbench surface 51a. Then, the conveying control unit 93 stops driving the suction mechanism 74. As a result, the elastic sheet 2 is dropped from the suction surface 71 and supplied to the placement area C.

[0123] (Workbench and positioning mechanism)

[0124] Fig.11 51 and the positioning mechanism. Figure 2 As shown in FIG. 1 , the workbench 51 is located in the Y2 direction of the storage 53. The workbench 51 is made of metal and has a horizontal workbench surface 51a. Fig.11 As shown, a coating 99 containing fluororesin is provided on the workbench surface 51a. In this example, the fluororesin contained in the coating 99 is PTFE. A loading area C for loading the elastic sheet 2 supplied from the supply mechanism 52 is set in the central part of the workbench surface 51a. The loading area C is an area larger than the plane shape of the elastic sheet 2 when viewed from the thickness direction. In addition, a supply position D for positioning the elastic sheet 2 is set in the central part of the loading area C. The supply position D is an area having a shape and size corresponding to the plane shape of the elastic sheet 2. A plurality of vents 101 are provided in the loading area C. The plurality of vents 101 are arranged in a matrix. In this example, the plurality of vents 101 are provided in a rectangular area including the supply position D.

[0125] The workbench 51 is provided with a second sensor 103 for detecting that the elastic sheet 2 is supplied to the workbench surface 51a. The second sensor 103 includes a light emitting portion, a light receiving portion, and a sensing detection portion 103a. The light emitting portion and the light receiving portion are connected by an optical fiber. The sensing detection portion 103a is provided between the light emitting portion and the light receiving portion in the optical fiber. The sensing detection portion 103a is provided in the center of the workbench surface 51a. The light emitting portion and the light receiving portion are arranged below the workbench 51. The second sensor 103 is connected to the control portion 7 of the elastic sheet punching system 1. If the elastic sheet 2 is supplied to the workbench surface 51a, the amount of light received by the light receiving portion changes. As a result, the output from the light receiving portion changes. Therefore, the control portion 7 can detect the presence of the elastic sheet 2 on the workbench surface 51a based on the output from the second sensor 103.

[0126] If the elastic sheet 2 is placed in the placement area C, the positioning mechanism 55 positions the elastic sheet 2 at the supply position D. Figure 1 As shown, the positioning mechanism 55 includes: a floating mechanism 105 that ejects air from a vent 101 provided in a loading area C of the table surface 51a to float the elastic sheet 2 from the table surface 51a; and an arrangement mechanism 106 that moves the floated elastic sheet 2 along the table surface 51a and arranges it at a floating position F located in the Z2 direction of the supply position D. The supply position D and the floating position F are areas of a planar shape facing the elastic sheet 2.

[0127] The floating mechanism 105 includes a compressor and an air supply pump (not shown). The air supply pump is connected to the vent 101 and ejects compressed air from the compressor from the vent 101. Here, the state in which the elastic sheet 2 is floated from the workbench surface 51a by the floating mechanism 105 includes a state in which the entire elastic sheet 2 is not separated from the workbench surface 51a but a part of the elastic sheet 2 is in contact with the workbench surface 51a. Therefore, the state in which the elastic sheet 2 is arranged at the floating position F includes a state in which a part of the elastic sheet 2 is in contact with the workbench surface 51a.

[0128] like Fig.11 As shown, the arrangement mechanism 106 includes: a first arrangement member 111, which can abut against the outer peripheral edge of the elastic sheet 2 floating in the loading area C from the X1 direction; a second arrangement member 112, which can abut against the outer peripheral edge of the elastic sheet 2 floating in the loading area C from the X2 direction; a third arrangement member 113, which can abut against the outer peripheral edge of the elastic sheet 2 floating in the loading area C from the Y1 direction; and a fourth arrangement member 114, which can abut against the outer peripheral edge of the elastic sheet 2 floating in the loading area C from the Y2 direction. The first arrangement member 111 and the second arrangement member 112 are plate-shaped members that stand up from the worktable surface 51a and extend in the Y direction. The third arrangement member 113 and the fourth arrangement member 114 are plate-shaped members that stand up from the worktable surface 51a and extend in the X direction.

[0129] In addition, the arrangement mechanism 106 includes, in the Z1 direction of the worktable 51, a first arrangement component moving mechanism 115 that moves the first arrangement component 111 in the X direction between a first separation position H1 that separates in the X1 direction of the loading area C and a floating position F; a second arrangement component moving mechanism 116 that moves the second arrangement component 112 in the X direction between a second separation position H2 that separates in the X2 direction of the loading area C and the floating position F; a third arrangement component moving mechanism 117 that moves the third arrangement component 113 in the Y direction between a third separation position H3 that separates in the Y1 direction of the loading area C and the floating position F; and a fourth arrangement component moving mechanism 118 that moves the fourth arrangement component 114 in the Y direction between a fourth separation position H4 that separates in the Y2 direction of the loading area C and the floating position F. Each of the arrangement component moving mechanisms 115 to 118 moves each of the arrangement components 111 to 114 along the slit 109 provided on the worktable surface 51a.

[0130] Here, if Figure 1 As shown, the positioning mechanism 55 includes a positioning control unit 120, which drives and controls the floating mechanism 105, the first arrangement component moving mechanism 115, the second arrangement component moving mechanism 116, the third arrangement component moving mechanism 117, and the fourth arrangement component moving mechanism 118 to position the elastic sheet 2 at the supply position D. More specifically, the positioning control unit 120 includes: a floating mechanism control unit 121 that drives and controls the floating mechanism 105; and a moving control unit 122 that drives and controls the first arrangement component moving mechanism 115, the second arrangement component moving mechanism 116, the third arrangement component moving mechanism 117, and the fourth arrangement component moving mechanism 118. The positioning control unit 120 is provided integrally with the control unit 7 of the elastic sheet punching system 1 or in a manner that allows communication.

[0131] When the elastic sheet 2 is supplied to the placement area C, the positioning control unit 120 drives the floating mechanism 105 to float the elastic sheet 2 from the table surface 51a, and drives the first arrangement component moving mechanism 115, the second arrangement component moving mechanism 116, the third arrangement component moving mechanism 117, and the fourth arrangement component moving mechanism 118 to simultaneously move the first arrangement component 111 at the first separation position H1, the second arrangement component 112 at the second separation position H2, the third arrangement component 113 at the third separation position H3, and the fourth arrangement component 114 at the fourth separation position H4 toward the floating position F. As a result, the elastic sheet 2 contacts the arrangement components 111 to 114 and moves to the supply position D. When the elastic sheet 2 is disposed at the floating position F, the floating mechanism control unit 121 stops the floating mechanism 105. As a result, the elastic sheet 2 descends from the floating position F and is disposed at the supply position D. If the elastic sheet 2 is arranged at the supply position D, the movement control unit 122 drives the first configuration component moving mechanism 115, the second configuration component moving mechanism 116, the third configuration component moving mechanism 117 and the fourth configuration component moving mechanism 118 to return the first configuration component 111, the second configuration component 112, the third configuration component 113 and the fourth configuration component 114 in the floating position F to the first separation position H1, the second separation position H2, the third separation position H3 and the fourth separation position H4 respectively.

[0132] (Transportation mechanism)

[0133] The conveying mechanism 56 conveys the elastic sheet 2 positioned at the supply position D to the first punching position A set in the first punching plate 18 of the first elastic sheet punching device 3. The conveying mechanism 56 has the same structure as the elastic sheet moving mechanism 54 of the supply mechanism 52. Therefore, in the description of the conveying mechanism 56, the same names and the same reference numerals are given to the structures corresponding to the elastic sheet moving mechanism 54, and the detailed description is omitted.

[0134] like Figure 1 As shown, the transport mechanism 56 includes: a suction portion 73 (first suction portion) including a suction surface 71 (first suction surface) and an air suction port 72 (first air suction port) provided on the suction surface 71; an air suction mechanism 74 (first air suction mechanism) connected to the air suction port 72; and an suction portion moving mechanism 75 (first suction portion moving mechanism) for moving the suction portion 73 and the air suction mechanism 74. Fig.10 As shown in (a), the adsorption part 73 includes a suction plate 81. The suction plate 81 includes a cylindrical portion 82 protruding from its central portion in the Z2 direction. In addition, the suction plate 81 includes a square-shaped recessed portion 83 in the central portion of the lower surface. A communication port 84 that penetrates the suction plate 81 in the Z direction is provided in the central portion of the recessed portion 83. The communication port 84 is connected to the cylindrical portion 82.

[0135] like Fig.10 As shown in (b), a sheet-like mesh member 85 that closes the recess 83 from below is fixed to the lower surface of the suction plate 81. A sheet-like frame 86 is attached to the outer periphery of the mesh member 85. The mesh member 85 is a metal mesh and has conductivity. The lower surface of the frame 86 is a rough surface. The lower surface of the frame 86 and the lower surface of the mesh member 85 constitute an adsorption surface 71 for adsorbing the elastic sheet 2. Therefore, the adsorption surface 71 has a rough surface portion. In addition, the adsorption surface 71 has a conductive metal portion. The air intake port 72 provided on the adsorption surface 71 is a plurality of openings provided by the mesh member 85. The frame-like portion 71a of the adsorption surface 71 constituted by the frame 86 contacts the outer periphery of the elastic sheet 2 when the elastic sheet 2 is adsorbed on the adsorption surface 71. When the ten-point average roughness of the surface of the frame-like portion 71a is set to R, R=50μm, which satisfies the above-mentioned conditional expression (7).

[0136] like Fig.10 As shown in (a), the air intake mechanism 74 includes an ejector 88. The air inlet 88a of the ejector 88 communicates with the opening of the net member 85, that is, the air intake port 72, via the cylinder 82, the communication port 84, and the recess 83 of the suction plate 81. Figure 1 As shown, the adsorption unit moving mechanism 75 includes a support unit 125 that supports the adsorption unit 73 and a support unit moving mechanism 126 that moves the support unit 125 in the X direction and the Z direction. The support unit moving mechanism 126 includes a driving source such as a motor.

[0137] Here, if Figure 1 As shown, the conveying mechanism 56 includes a conveying control unit 123 (first conveying control unit) for driving and controlling the suction mechanism 74 and the adsorption unit moving mechanism 75. The conveying control unit 123 is integrally provided with the control unit 7 of the elastic sheet punching system 1 or is communicatively provided. If the elastic sheet 2 is positioned at the supply position D on the workbench 51, the conveying control unit 123 drives and controls the adsorption unit moving mechanism 75 to move the adsorption unit 73 so that its adsorption surface 71 faces the elastic sheet 2 arranged at the supply position D with a gap therebetween. Next, the conveying control unit 123 drives the suction mechanism 74 to suck up the elastic sheet 2 and adsorb it on the adsorption surface 71, and drives the adsorption unit moving mechanism 75 to move the adsorption unit 73 in the direction X1 according to the prescribed conveying path G2. Thereafter, the conveying control unit 123 makes the adsorption unit 73 face the first punching position A set in the first punching plate 18 of the first elastic sheet punching device 3. Then, the conveying control unit 123 stops driving the suction mechanism 74. As a result, the elastic piece 2 is dropped from the suction surface 71 and arranged at the first punching position A.

[0138] (Second elastic sheet conveying device)

[0139] Fig.12(a) is a cross-sectional view of the suction portion 73 of the second elastic sheet conveying device 6 . Fig.12 (b) is a perspective view of the suction portion 73 of the second elastic sheet conveying device 6 as viewed from the Z1 direction. Fig.12 (a) schematically shows a state where the elastic sheet 2 is sucked by the suction portion 73. The second elastic sheet conveying device 6 conveys the elastic sheet 2 arranged at the first punching position A of the first elastic sheet punching device 3 to the second punching position B set at the second punching plate 18 of the second elastic sheet punching device 4. The second elastic sheet conveying device 6 has a structure corresponding to the elastic sheet moving mechanism 54 and the conveying mechanism 56 of the first elastic sheet conveying device 5. Therefore, in the description of the second elastic sheet conveying device 6, the same names and the same reference numerals are given to the structures corresponding to the elastic sheet moving mechanism 54 and the conveying mechanism 56, and detailed description is omitted.

[0140] like Figure 1 As shown, the second elastic sheet conveying device 6 includes: a suction portion 73 (second suction portion) including a suction surface 71 (second suction surface) and an air suction port 72 (second air suction port) provided on the suction surface 71; an air suction mechanism 74 (second air suction mechanism) connected to the air suction port 72; and an suction portion moving mechanism 75 (second suction portion moving mechanism) for moving the suction portion 73 and the air suction mechanism 74. Fig.12 As shown, the adsorption part 73 includes a suction plate 81. The suction plate 81 includes a cylindrical portion 82 protruding from its central portion in the Z2 direction. In addition, the suction plate 81 includes a square-shaped recessed portion 83 in the central portion of the lower surface. A communication port 84 that penetrates the suction plate 81 in the Z direction is provided in the central portion of the recessed portion 83. The communication port 84 is connected to the cylindrical portion 82.

[0141] like Fig.12 As shown, a sheet-like net member 85 is fixed to the lower surface of the suction plate 81 to close the recess 83 from below. A sheet-like frame 86 is attached to the outer peripheral edge of the net member 85. In addition, a sheet-like rectangular body 87 is attached to the inner peripheral side of the frame 86 of the net member 85. The lower surfaces of the rectangular body 87 and the frame 86 are rough surfaces. The rectangular body 87 and the frame 86 are separated in the radial direction, and the net member 85 is exposed downward from the gap between the rectangular body 87 and the frame 86. When the adsorption part 73 adsorbs the elastic sheet 2, the frame-like net portion 85a exposed from the gap between the rectangular body 87 and the frame 86 in the net member 85 faces the frame-like burr portion 61a of the elastic sheet 2. The multiple openings of the frame-like net portion 85a exposed from the gap between the rectangular body 87 and the frame 86 in the net member 85 are the air intake ports 72.

[0142] The lower surface of the rectangular body 87, the lower surface of the frame body 86, and the lower surface of the frame-shaped mesh portion 85a of the mesh member 85 exposed from the gap between the rectangular body 87 and the frame body 86 constitute the adsorption surface 71 for adsorbing the elastic sheet 2. Therefore, the adsorption surface 71 has a conductive metal portion. Here, the frame-shaped portion 71a and the rectangular portion 71b of the adsorption surface 71 constituted by the frame body 86 and the rectangular body 87 are in contact with the central portion and the outer peripheral edge of the elastic sheet 2 when the adsorption surface 71 adsorbs the elastic sheet 2. When the ten-point average roughness R is set to R, the surface of the frame-shaped portion 71a and the surface of the rectangular portion 71b satisfy the above-mentioned conditional expression (7).

[0143] The air intake mechanism 74 includes an ejector 88. An air inlet 88a of the ejector 88 communicates with the air intake port 72 which is an opening of the net member 85 via the cylindrical portion 82, the communication port 84, and the recessed portion 83 of the suction plate 81.

[0144] like Figure 1 As shown in FIG. 1 , the adsorption portion moving mechanism 75 includes: a support portion 127 that supports the adsorption portion 73; and a support portion moving mechanism 128 that moves the support portion 125 in the X direction and the Z direction. The support portion moving mechanism 128 includes a driving source such as a motor. In this example, the support portion moving mechanism 126 of the conveying mechanism 56 also serves as the support portion moving mechanism 128 of the second elastic sheet conveying device 6. That is, in this example, in the X direction, the supply position D, the first punching position A, and the second punching position B are set at equal intervals. In addition, the table surface 51a, the punching plate surface 18a of the first punching plate 18, and the punching plate surface 18a of the second punching plate 18 are set at the same height. Thus, the support portion moving mechanism 126 of the conveying mechanism 56 can move the elastic sheet 2 from the supply position D to the first punching position A and the elastic sheet 2 from the first punching position A to the second punching position B in parallel by simultaneously moving the support portion 125 of the conveying mechanism 56 and the support portion 125 of the second elastic sheet conveying device 6 at a constant interval.

[0145] Here, the second elastic sheet conveying device 6 includes: a conveying control unit 124 (second conveying control unit) for driving and controlling the suction mechanism 74 and the adsorption unit moving mechanism 75. The conveying control unit 124 is provided integrally with the control unit 7 of the elastic sheet punching system 1 or in a communication manner. When the punching operation of the inner burr portion 61b of the elastic sheet 2 is completed in the first elastic sheet punching device 3, the conveying control unit 124 drives and controls the adsorption unit moving mechanism 75 to move the adsorption unit 73 so that the adsorption surface 71 faces the elastic sheet 2 at the first punching position A on the punch plate surface 18a with a gap therebetween. Next, the conveying control unit 124 drives the suction mechanism 74 to suck up the elastic sheet 2 in the Z2 direction and adsorb it to the adsorption surface 71. In addition, the conveying control unit 124 drives the adsorption unit moving mechanism 75 to move the adsorption unit 73 in the X1 direction according to the prescribed conveying path G3. Thereafter, the transport control unit 124 makes the suction unit 73 face the second punching position B set in the second punching plate 18 of the second elastic sheet punching device 4. Then, the transport control unit 124 stops driving the suction mechanism 74. Thus, the elastic sheet 2 falls from the suction surface 71 and is disposed at the second punching position B.

[0146] (Action of the elastic sheet punching system)

[0147] Fig.13 FIG. 1 is a flow chart of the operation of the elastic sheet blanking system 1. Figure 2 As shown, when manufacturing the seal, first, the elastic sheet 2 is held in the storage 53 and arranged at the retention position E. Thus, the elastic sheet 2 is retained in the temperature tank 70 (step ST1). Next, the elastic sheet punching system 1 transports the elastic sheet 2 from the storage 53 to the workbench 51 (step ST2), and positions the elastic sheet 2 at the supply position D in the workbench 51 (step ST3). Thereafter, the elastic sheet punching system 1 transports the elastic sheet 2 from the supply position D to the first punching position A of the first elastic sheet punching device 3 (step ST4), and the inner burr portion 61b of the elastic sheet 2 is punched out by the first elastic sheet punching device 3 (step ST5). Then, the elastic sheet punching system 1 transports the elastic sheet 2 from the first punching position A to the second punching position B of the second elastic sheet punching device 4 (step ST6), and the annular product portion 60 of the elastic sheet 2 is punched out by the second elastic sheet punching device 4 (step ST7). Thus, the manufacturing of the seal is completed.

[0148] (Retention of elastic sheet in temperature tank)

[0149] The elastic sheet 2 manufactured by the rubber injection molding machine is loaded in the storage 53 and arranged at the retention position E in the temperature tank 70. Thus, the elastic sheet 2 is retained in the temperature tank 70 for a predetermined time or longer.

[0150] Here, the dimensions of the elastic sheet 2 may vary from one manufacturing batch to another due to the temperature and pressure conditions during manufacturing. Therefore, the dimensions of the elastic sheet 2 may not be consistent with the designed dimensions depending on the manufacturing batch. In order to solve this problem, in this example, the temperature in the temperature tank 70 can be adjusted to change the dimensions of the elastic sheet 2 stored in the storage 53 to be consistent with the designed dimensions.

[0151] When the size of the elastic sheet 2 is changed, the temperature in the tank is adjusted within the range of -50°C to 60°C. When the temperature in the tank is increased by 10°C, the size of the elastic sheet 2 increases by 0.1% to 0.3%. In addition, depending on the elastic sheet 2, the viscosity of the elastic sheet 2 is increased by adjusting the temperature in the tank to improve the rigidity of the elastic sheet 2. In addition, when the elastic sheet 2 is charged with static electricity, the temperature in the tank is sometimes set to 0° or less. When the temperature in the tank is set to 0° or less, condensation occurs on the surface of the elastic sheet 2 when the elastic sheet 2 is transported out of the temperature tank 70. In this way, static electricity is removed.

[0152] If the size of the elastic sheet 2 is set to the designed size, the elastic sheet 2 can be positioned on the workbench 51 with high accuracy in step ST3. In addition, if the size of the elastic sheet 2 is set to the designed size, the elastic sheet 2 can be arranged at the first punching position A of the first elastic sheet punching device 3 and the second punching position B of the second elastic sheet punching device 4 with high accuracy in steps ST5 and ST7, so that the desired portion of the elastic sheet 2 can be punched with high accuracy.

[0153] (Transfer of elastic sheets from storage to workbench)

[0154] When manufacturing the sealing member, the conveying control unit 93 drives and controls the suction mechanism 74 of the supply mechanism 52 and the elastic sheet moving mechanism 54 so that the elastic sheet 2 in the storage 53 is adsorbed on the adsorption surface 71 of the adsorption unit 73, and the adsorption unit 73 is moved along the prescribed conveying path G1 (see Figure 2 ) moves and is supplied to the loading area C set on the workbench 51 by releasing the adsorption.

[0155] Here, the air suction mechanism 74 that sucks air from the air suction port 72 of the suction surface 71 includes an ejector 88 that sucks a large amount of air per unit time. Therefore, after the suction surface 71 of the suction portion 73 and the elastic sheet 2 face each other with a gap therebetween, the conveyance control unit 93 can drive the air suction mechanism 74 to suck up the elastic sheet 2 and adsorb it to the suction surface 71. As a result, the elastic sheet 2 can be attracted to the suction surface 71 without pressing the suction surface 71 against the elastic sheet 2, so that when the elastic sheet 2 is adsorbed to the suction surface 71, it is possible to prevent the elastic sheet 2 from being deformed or damaged.

[0156] In addition, if Fig.10As shown, the adsorption surface 71 includes a frame-shaped portion 71a that contacts the outer peripheral edge of the elastic sheet 2 when the elastic sheet 2 is adsorbed. The air inlet 72 is located on the inner peripheral side of the frame-shaped portion 71a. The frame-shaped portion 71a is a rough surface. Therefore, when the adsorption portion 73 adsorbs the elastic sheet 2 to the adsorption surface 71 by driving the ejector 88, air flows between the frame-shaped portion 71a of the adsorption surface 71 and the outer peripheral edge of the elastic sheet 2 that contacts the frame-shaped portion 71a. In other words, when the elastic sheet 2 is adsorbed on the adsorption surface 71, an airflow from the outer peripheral side of the elastic sheet 2 toward the inner peripheral side of the frame-shaped portion 71a where the air inlet 72 is located is generated between the adsorption surface 71 and the elastic sheet 2. As a result, the adsorption surface 71 and the elastic sheet 2 are not in a close contact state, so when the drive of the ejector 88 is stopped, the elastic sheet 2 is easily separated from the adsorption surface 71. Therefore, it is easy to arrange the elastic sheet 2 in the loading area C of the workbench 51.

[0157] Furthermore, when the ten-point average roughness is defined as R, the surface of the frame-shaped portion 71 a has R=50 μm, and satisfies the following conditional expression (7).

[0158] 8μm≤R··(7)

[0159] Therefore, when the adsorption portion 73 adsorbs the elastic sheet 2 to the adsorption surface 71 by driving the ejector 88, air easily flows between the adsorption surface 71 and the elastic sheet 2. Here, when the ten-point average roughness R is lower than the lower limit value of the conditional expression (7), air is difficult to flow between the adsorption surface 71 and the elastic sheet 2.

[0160] Furthermore, the attraction surface 71 includes a metal portion (the mesh member 85 ) made of a conductive metal. Therefore, even if the elastic sheet 2 is charged by static electricity or the like, the charge can be released from the metal portion to the attraction portion 73 .

[0161] (Positioning of the elastic sheet supplied to the workbench)

[0162] When the elastic sheet 2 is supplied to the workbench 51, the positioning control unit 120 obtains the fact that the elastic sheet 2 is arranged in the loading area C through the output from the second sensor 103. If the elastic sheet 2 is arranged in the loading area C, the positioning control unit 120 drives the floating mechanism 105 to spray air from the vent 101 on the workbench surface 51a, so that the elastic sheet 2 floats from the workbench surface 51a. Fig.11As shown by the middle arrow, the positioning control unit 120 drives the first configuration component moving mechanism 115, the second configuration component moving mechanism 116, the third configuration component moving mechanism 117 and the fourth configuration component moving mechanism 118 in parallel so that the first configuration component 111 at the first separation position H1, the second configuration component 112 at the second separation position H2, the third configuration component 113 at the third separation position H3 and the fourth configuration component 114 at the fourth separation position H4 move toward the floating position F at the same time.

[0163] When the first arrangement member 111, the second arrangement member 112, the third arrangement member 113, and the fourth arrangement member 114 arrive at the supply position D, the elastic sheet 2 is arranged at the floating position F located above the supply position D. When the first arrangement member 111, the second arrangement member 112, the third arrangement member 113, and the fourth arrangement member 114 arrive at the supply position D, the positioning control unit 120 stops the floating mechanism 105. As a result, the elastic sheet 2 is lowered from the floating position F and arranged at the supply position D on the table surface 51a.

[0164] Here, the state in which the elastic sheet 2 floats from the table surface 51a includes a state in which the entire elastic sheet 2 is not separated from the table surface 51a but a part of the elastic sheet 2 is in contact with the table surface 51a. Even when a part of the elastic sheet 2 is in contact with the table surface 51a, the elastic sheet 2 floats, so the elastic sheet 2 moves on the table 51 without sticking. In addition, even when a part of the elastic sheet 2 is in contact with the table surface 51a, the coating layer 99 containing fluorine resin is provided on the table surface 51a, so the elastic sheet 2 is easy to move on the table 51.

[0165] Thereafter, if the elastic sheet 2 is arranged at the supply position D, the positioning control unit 120 drives the first arrangement component moving mechanism 115, the second arrangement component moving mechanism 116, the third arrangement component moving mechanism 117 and the fourth arrangement component moving mechanism 118, so that the first arrangement component 111, the second arrangement component 112, the third arrangement component 113 and the fourth arrangement component 114 at the supply position D return to the first separation position H1, the second separation position H2, the third separation position H3 and the fourth separation position H4 respectively.

[0166] (Transfer of elastic sheet from supply position to first elastic sheet punching device)

[0167] When the elastic sheet 2 is positioned at the supply position D on the table surface 51a, the transport control unit 123 drives and controls the suction mechanism 74 and the adsorption unit moving mechanism 75 of the transport mechanism 54 so that the elastic sheet 2 is adsorbed on the adsorption surface 71 of the adsorption unit 73, and the adsorption unit 73 is moved along the prescribed transport path G2 (see FIG. Figure 2 ) moves and is arranged at the first punching position A by releasing the adsorption.

[0168] Here, in the conveying mechanism 54, the suction mechanism 74 that sucks air from the suction mechanism 74 of the suction surface 71 includes an ejector 88 having a large suction amount of the sucked air per unit time. Therefore, after the suction surface 71 of the suction portion 73 and the elastic sheet 2 are facing each other with a gap therebetween, the conveying control unit 123 can drive the suction mechanism 74 to suck up the elastic sheet 2 and adsorb it to the suction surface 71. As a result, the elastic sheet 2 can be attracted to the suction surface 71 without pressing the suction surface 71 against the elastic sheet 2, so that the elastic sheet 2 can be prevented from being deformed when the elastic sheet 2 is adsorbed to the suction surface 71.

[0169] In addition, the suction surface 71 includes a frame-shaped portion 71a that contacts the outer peripheral edge of the elastic sheet 2 when the elastic sheet 2 is sucked. The suction mechanism 74 is located on the inner peripheral side of the frame-shaped portion 71a. When the ten-point average roughness of the surface of the frame-shaped portion 71a is set to R, R=50μm, which satisfies the above-mentioned conditional expression (7). Therefore, when the suction unit 73 sucks the elastic sheet 2 on the suction surface 71 by driving the ejector 88, air flows between the frame-shaped portion 71a of the suction surface 71 and the outer peripheral edge of the elastic sheet 2 in contact with the frame-shaped portion 71a. As a result, the suction surface 71 and the elastic sheet 2 are not in a close contact state, so when the ejector 88 is stopped and the suction is released, the elastic sheet 2 is easily separated from the suction surface 71. Therefore, it is easy to arrange the elastic sheet 2 at the first punching position A. Therefore, the elastic sheet 2 can be accurately arranged at the first punching position A.

[0170] Furthermore, the attraction surface 71 includes a metal portion (the mesh member 85 ) made of a conductive metal. Therefore, even if the elastic sheet 2 is charged by static electricity or the like, the charge can be released from the metal portion to the attraction portion 73 .

[0171] (Blanking of the Elastic Sheet by the First Elastic Sheet Blanking Device)

[0172] When the elastic sheet 2 is supplied to the first punching position A, the punch plate 13 is arranged at the standby position 13A. Figure 4 As shown in FIG. 1 , if the elastic sheet 2 is supplied to the first punching position A, the elastic sheet 2 is set in the punching plate side recess 28 of the first punching plate 18. If the elastic sheet 2 is set, the first punching control unit 22 lowers the first punch plate 13 from the standby position 13A toward the punching end position 13B. Thereafter, as shown in FIG. Figure 5 As shown in FIG. 1 , if the first punch plate 13 approaches the first punch plate 18, the first elastic sheet blanking device 3 makes the first stripper plate 15 contact the first punch plate 18 and clamp the elastic sheet 2 therebetween. Thereafter, if the first punch plate 13 further approaches the first punch plate 18, Figure 6As shown, the first elastic sheet punching device 3 punches the inner burr portion 61b of the elastic sheet 2 by the first punch portion 12 protruding from the first stripper plate 15 in the Z1 direction, and inserts the front end portion 14 of the first punch portion 12 into the first hole portion 19. Then, the first punching control unit 22 separates the first punch plate 13 and the first stripper plate 15 from the first punch plate 18 in the Z2 direction. Figure 4 As shown, the punch plate 13 returns to the standby position 13A.

[0173] Here, the suction mechanism control unit 35 drives the suction mechanism 34 while the first stripper plate 15 is in contact with the first punch plate 18. In addition, the first punch control unit 22 sets the second speed V2 for returning the first punch plate 13 from the punching end position 13B to the standby position 13A to be slower than the first speed V1 for moving the first punch plate 13 from the standby position 13A to the punching end position 13B.

[0174] In this example, the first stripper plate 15 and the first punch plate 18 that clamp the elastic sheet 2 from the Z direction during punching are provided with a stripper plate side recess 27 and a punch plate side recess 28 that define a space 29 of a transfer shape to which the shape of the elastic sheet 2 is transferred when they are brought into contact. Therefore, when the elastic sheet 2 is clamped between the first stripper plate 15 and the first punch plate 18, the elastic sheet 2 is accommodated in the space 29 to which its own shape is transferred. Thus, it is possible to prevent or suppress the elastic sheet 2 from being crushed and deformed before punching. Therefore, it is possible to prevent or suppress the first punch head 12 from contacting a portion different from the punching object of the elastic sheet 2, that is, the inner burr portion 61b.

[0175] In addition, when the stripper plate surface 15a and the punch plate surface 18a are in contact, the elastic sheet 2 is embedded in the stripper plate side recess 27 having a transfer shape corresponding to the shape of the upper surface of the elastic sheet 2, and is embedded in the punch plate side recess 28 having a transfer shape corresponding to the shape of the lower surface of the elastic sheet 2. Therefore, the elastic sheet 2 is in a state where deformation in the in-plane direction of the punch plate surface 18a within the space 29 defined between the first stripper plate 15 and the first punch plate 18 is restricted. Therefore, even if the elastic sheet 2 is adhered to the first punch portion 12 when the first punch portion 12 penetrates the elastic sheet 2, and the first punch portion 12 enters the first hole portion 19 and pulls the elastic sheet 2 toward the first hole portion 19, it is possible to prevent or suppress the elastic sheet 2 from being pulled into the first hole portion 19.

[0176] Here, the die plate surface 18a and the inner surface 28a of the die plate side recess 28 are covered by the first coating 32 containing fluorine resin. Therefore, compared with the case where these surfaces are metal surfaces, the die plate surface 18a and the inner surface 28a of the die plate side recess 28 are easy to slide. Therefore, even if the elastic sheet 2 and the die plate side recess 28 are misaligned in the in-plane direction of the die plate surface 18a when the conveying mechanism 56 supplies the elastic sheet 2 to the die plate side recess 28, the elastic sheet 2 slides on the die plate surface 18a and the inner surface 28a of the die plate side recess 28, and is set in a state where its lower surface is embedded in the die plate side recess 28. As a result, the elastic sheet 2 is correctly arranged at the first punching position A on the first die plate 18. Therefore, when the elastic sheet 2 is clamped between the first die plate 18 and the first stripper plate 15, the elastic sheet 2 is not crushed. In addition, the elastic sheet 2 is correctly arranged at the first punching position A on the first die plate 18, so the elastic sheet 2 can be correctly punched by the first punch head 12.

[0177] In addition, before the elastic sheet 2 is conveyed from the storage 53 to the first punching position A, it is placed on the workbench 51 and positioned at the supply position D on the workbench 51. Thereafter, the elastic sheet 2 positioned at the supply position D is adsorbed and moved by the conveying mechanism, and is disposed at the first punching position A by releasing the adsorption. Therefore, the elastic sheet 2 is disposed at the first punching position A with the same accuracy as the positioning accuracy at the supply position D on the workbench 51. Therefore, the elastic sheet 2 is supplied to the first punching position A with high accuracy.

[0178] Furthermore, in this example, the inner peripheral wall surface 19a of the first hole portion 19 of the first punch plate 18 is covered by the first coating 32. Therefore, compared with the case where the inner peripheral wall surface 19a is a metal surface, the inner peripheral wall surface 19a of the first hole portion 19 is easy to slide. Therefore, when the first punch portion 12 pulls the elastic sheet 2 into the first hole portion 19 during punching, the elastic sheet 2 slides on the inner peripheral wall surface 19a of the first hole portion 19. Thus, it is possible to prevent or suppress a decrease in the speed of the first punch portion 12 punching the elastic sheet 2. Therefore, the elastic sheet 2 can be punched out with high precision by the first punch portion 12.

[0179] In addition, when the ten-point average roughness D is defined as D, the punch plate surface 18a and the inner surface 28a of the punch plate side recess 28 satisfy the following conditional expressions (5) and (6).

[0180] 5μm≤D≤40μm··(5)

[0181] 8μm≤D≤12μm··(6)

[0182] If conditional expression (5) is satisfied, the contact area between the elastic sheet 2 and the die plate surface 18a and the inner surface 28a of the die plate side recess 28 is reduced. Here, when the ten-point average roughness D is lower than the lower limit of conditional expression (5), the elastic sheet 2 is easily attached to the first die plate 18, and thus, sometimes it is difficult to remove the punched elastic sheet 2 from the die plate side recess 28. In addition, when the ten-point average roughness D is higher than the upper limit of conditional expression (5), sometimes the elastic sheet 2 is damaged by the unevenness of the rough surface. In this example, the ten-point average roughness of the die plate surface 18a and the inner surface 28a of the die plate side recess 28 satisfies conditional expression (6). Therefore, the elastic sheet 2 is not easily attached to the die plate surface 18a and the inner surface 28a of the die plate side recess 28. In addition, it is easy to suppress the elastic sheet 2 from being damaged by the die plate surface 18a and the inner surface 28a of the die plate side recess 28 being rough surfaces.

[0183] In addition, the front end portion 14 of the first punch portion 12 includes a punching portion 25 and a column portion 26 in order from the front end toward the Z2 direction. The column portion 26 is thinner than the punching portion 25 and is located inside the punching portion 25 when viewed from the Z direction. Therefore, when the front end portion 14 of the first punch portion 12 intrudes into the first hole portion 19 of the first punch plate 18, a gap is formed between the column portion 26 and the inner peripheral wall surface 19a of the first hole portion 19. Therefore, when the punching portion 25 pulls the elastic sheet 2 toward the first hole portion 19 when the front end portion 14 of the first punch portion 12 intrudes into the first hole portion 19, it is possible to prevent the elastic sheet 2 from being closely attached to the column portion 26 and the first punch portion 12 from further pulling the elastic sheet 2 into the depth of the first hole portion 19. In addition, since a gap is formed between the column portion 26 and the inner peripheral wall surface 19a of the first hole portion 19, it is possible to prevent or suppress the annular product portion 60 of the elastic sheet 2 located on the outer peripheral side of the first punch portion 12 from rubbing between the column portion 26 and the inner peripheral wall surface 19a of the first hole portion 19. Thus, it is possible to prevent the annular product portion 60 from being damaged.

[0184] In this example, the front end surface 12a of the first punch portion 12 is a rough surface. When the ten-point average roughness is P, the front end surface 12a of the first punch portion 12 satisfies the following conditional expressions (1) and (2), P=10 μm.

[0185] 5μm≤P≤20μm··(1)

[0186] 8μm≤P≤12μm··(2)

[0187] If conditional expression (1) is satisfied, the contact area between the front end face 12a of the first punch portion 12 and the elastic sheet 2 can be reduced. Therefore, it is possible to prevent the inner burr portion 61b of the elastic sheet 2 after punching by the first punch portion 12 from sticking to the front end face 12a of the first punch portion 12 without falling off, and from moving in the Z2 direction together with the first punch plate 13 after punching. That is, when the ten-point average roughness P is lower than the lower limit of conditional expression (1), the elastic sheet 2 is easily stuck to the front end face 12a of the first punch portion 12. When the ten-point average roughness P is higher than the upper limit of conditional expression (1), the elastic sheet 2 is sometimes easily damaged when the front end face 12a of the first punch portion 12 contacts the elastic sheet 2. In this example, the ten-point average roughness P of the front end face 12a of the first punch portion 12 satisfies conditional expression (2). Therefore, the burr portion 61b is easily detached from the first punch portion 12. In addition, it is easy to suppress the product portion 60 from being damaged due to the rough surface of the first punch portion 12 .

[0188] In addition, the first punch portion 12 has a central protrusion 25b protruding in the Z1 direction from the outer peripheral edge of the front end surface at the center of the front end surface. The front end of the central protrusion 25b is a plane perpendicular to the axis of the first punch portion 12. Therefore, when the first punch portion 12 contacts the inner burr portion 61b of the elastic sheet 2, the plane of the front end of the central protrusion 25b presses the inner burr portion 61b of the elastic sheet 2 to elastically deform it. Therefore, after the inner burr portion 61b is punched out by the first punch portion 12, the inner burr portion 61b returns to its original shape by its own elastic restoring force. As a result, the inner burr portion 61b is easily separated from the front end surface of the first punch portion 12. Therefore, it is possible to prevent or suppress the situation where the inner burr portion 61b of the elastic sheet 2 punched out by the first punch portion 12 sticks to the first punch portion 12 and does not fall off. Therefore, it is possible to prevent the inner burr portion 61b from moving in the Z2 direction together with the first punch portion 12 after punching.

[0189] Furthermore, the first punching control unit 22 sets the second speed V2 for returning the first punch plate 13 from the punching end position 13B to the standby position 13A to be slower than the first speed V1 for moving the first punch plate 13 from the standby position 13A to the punching end position 13B. As a result, the moving speed of the first stripper plate 15 when the first stripper plate 15 is separated from the elastic sheet 2 in the Z2 direction is slowed down. Therefore, it is possible to prevent or suppress the elastic sheet 2 from being pulled by the first stripper plate 15 that is separated upward from the first punch plate 18. Therefore, it is possible to prevent or suppress the elastic sheet 2 from moving on the first punch plate 18.

[0190] In addition, when the ten-point average roughness S is defined as S, the release plate surface 15a and the inner surface 27a of the release plate side recess 27 satisfy the following conditional expressions (3) and (4).

[0191] 5μm≤S≤40μm··(3)

[0192] 8μm≤S≤12μm··(4)

[0193] If the conditional expression (3) is satisfied, the contact area between the stripper plate surface 15a and the inner surface 27a of the stripper plate side recess 27 and the elastic sheet 2 can be reduced. Therefore, it is possible to prevent or suppress the elastic sheet 2 from sticking to the stripper plate surface 15a and the inner surface 27a of the stripper plate side recess 27. Here, when the ten-point average roughness S is lower than the lower limit of the conditional expression (3), the elastic sheet 2 is easy to stick to the first stripper plate 15. Therefore, when the first stripper plate 15 is separated from the first punch plate 18 in the Z2 direction, the elastic sheet 2 may be pulled by the first stripper plate 15 and move from the punch plate side recess 28 of the first punch plate 18. In addition, when the ten-point average roughness S is higher than the upper limit of the conditional expression (3), the elastic sheet 2 may be damaged due to the unevenness of the rough surface. In this example, the ten-point average roughness S of the stripper plate surface 15a and the inner surface 27a of the stripper plate side recess 27 satisfy the conditional expression (4). Therefore, it is easier to prevent the elastic sheet 2 from sticking to the first stripper plate 15. In addition, since the stripper plate surface 15 a and the inner surface 27 a of the stripper plate-side recess 27 are rough surfaces, it is easy to prevent the elastic sheet 2 from being damaged.

[0194] Furthermore, in this example, the suction mechanism control unit 35 of the first recovery mechanism 23 drives the suction mechanism 34 during the period when the first stripper plate 15 is in contact with the first punch plate 18. Therefore, when the first punch portion 12 punches out the elastic sheet 2, an airflow toward the first recovery box 24 side is generated between the radially outer surface of the front end portion 14 of the first punch portion 12 and the inner peripheral wall surface 19a of the first hole portion 19. Thus, it is possible to prevent or suppress the situation where the inner burr portion 61b of the elastic sheet 2 punched out by the first punch portion 12 sticks to the first punch portion 12 and does not fall off. In addition, by the airflow toward the first recovery box 24 side, the inner burr portion 61b that falls off from the first punch portion 12 is easily recovered to the first recovery box 24.

[0195] (Transfer of elastic sheet from first elastic sheet punching device to second elastic sheet punching device)

[0196] When the punching of the elastic sheet 2 by the first elastic sheet punching device 3 is completed, the conveying control unit 124 drives and controls the suction mechanism 74 and the suction unit moving mechanism 75 of the second elastic sheet conveying device 6 to suck the elastic sheet 2 onto the suction surface 71 of the suction unit 73, and moves the suction unit 73 along a predetermined conveying path G3 (see FIG. Figure 2 ) moves and is arranged at the second punching position B by releasing the adsorption.

[0197] Here, if Fig.12As shown, the adsorption portion 73 of the second elastic sheet conveying device 6 is provided with a suction port 72 in a frame-shaped opposing region of the adsorption surface 71 that is opposed to the frame-shaped burr portion 61a of the elastic sheet 2. Thus, the adsorption portion 73 can adsorb the outer peripheral edge portion of the elastic sheet 2 to the adsorption surface 71 over the entire circumference. Therefore, even if a hole punched by the first elastic sheet punching device 3 is formed on the inner circumference of the frame-shaped burr portion 61a of the elastic sheet 2, the adsorption portion 73 can adsorb the elastic sheet 2. In addition, the adsorption portion 73 adsorbs the outer peripheral edge portion of the elastic sheet 2 over the entire circumference, so that the adsorbed elastic sheet 2 can be prevented or suppressed from being bent. Therefore, the elastic sheet 2 can be accurately arranged at the second punching position B on the punch plate surface 18a.

[0198] In the second elastic sheet conveying device 6, the air suction mechanism 74 that sucks air from the second air suction port of the suction surface 71 includes an ejector 88 that sucks a large amount of air per unit time. Therefore, after the suction surface 71 of the suction portion 73 and the elastic sheet 2 are facing each other with a gap, the conveying control unit 124 can drive the air suction mechanism 74 to suck up the elastic sheet 2 and adsorb it to the suction surface 71. In addition, the suction surface 71 includes a frame-shaped portion 71a that contacts the outer peripheral edge of the elastic sheet 2 when the elastic sheet 2 is adsorbed, and a rectangular portion 71b that contacts the inner peripheral side of the frame-shaped burr portion 61a of the elastic sheet 2. The frame-shaped portion 71a and the rectangular portion 71b are rough surfaces. Therefore, when the elastic sheet 2 is adsorbed on the suction surface 71, air flows between the suction surface 71 and the elastic sheet 2. As a result, the suction surface 71 and the elastic sheet 2 are not in a close contact state, so when the drive of the ejector 88 is stopped, the elastic sheet 2 is easily separated from the suction surface 71. Therefore, it is easy to arrange the elastic piece 2 at the second punching position B. Therefore, the elastic piece 2 can be arranged at the second punching position B accurately.

[0199] In addition, when the ten-point average roughness of the surface of the frame-shaped portion 71a and the surface of the rectangular portion 71b is R, R=50 μm, which satisfies the above-mentioned conditional expression (7). Therefore, when the adsorption portion 73 adsorbs the elastic sheet 2 to the adsorption surface 71 by driving the ejector 88, air easily flows between the adsorption surface 71 and the elastic sheet 2.

[0200] Furthermore, the attraction surface 71 includes a metal portion (the mesh member 85 ) made of a conductive metal. Therefore, even if the elastic sheet 2 is charged by static electricity or the like, the charge can be released from the metal portion to the attraction portion 73 .

[0201] (Blanking of the Elastic Sheet by the Second Elastic Sheet Blanking Device)

[0202] If the elastic sheet 2 is supplied to the second punching position B, the elastic sheet 2 is set in the punch plate side recess 28 of the second punch plate 18. If the elastic sheet 2 is set, the second punching control unit 22 lowers the second punch plate 13 from the standby position 13A toward the punching end position 13B. Thereafter, if the second punch plate 13 approaches the second punch plate 18, the second elastic sheet punching device 4 brings the second stripper plate 15 into contact with the second punch plate 18 to clamp the elastic sheet 2 therebetween. Thereafter, if the second punch plate 13 further approaches the second punch plate 18, the second elastic sheet punching device 4 punches the annular product portion 60 of the elastic sheet 2 by the second punch portion 12 protruding from the second stripper plate 15 in the Z1 direction, and inserts the front end portion 14 of the second punch portion 12 into the second hole portion 19. Then, the second punching control unit 22 separates the second punch plate 13 and the second stripper plate 15 from the second punch plate 18 in the Z2 direction. Thus, the punch plate 13 returns to the standby position 13A.

[0203] Here, the suction mechanism control unit 35 drives the suction mechanism 34 while the second stripper plate 15 is in contact with the second punch plate 18. In addition, the second punch control unit 22 sets the second speed V2 for returning the second punch plate 13 from the punching end position 13B to the standby position 13A to be slower than the first speed V1 for moving the second punch plate 13 from the standby position 13A to the punching end position 13B.

[0204] When the punching of the elastic sheet 2 is completed and the second punch plate 13 and the second stripper plate are separated from the second punch plate 18 in the Z2 direction, the elastic sheet removal mechanism control unit 45 drives the air supply pump 43 to discharge compressed air from the nozzle 42. As a result, the elastic sheet removal mechanism 41 blows away the elastic sheet 2 disposed in the punch plate side recess 28 and drops it in the X1 direction of the second punch plate 18.

[0205] The second elastic sheet punching device 4 can also obtain the same effects as the first elastic sheet punching device 3. Here, in the second elastic sheet punching device 4, the front end surface 12a of the second punch portion 12 contacts the annular product portion 60, but the ten-point average roughness P of the front end surface 12a of the second punch portion 12 is 10 μm, which is smaller than the upper limit value of the conditional expression (1) and the upper limit value of the conditional expression (2). Therefore, it is possible to prevent or suppress the annular product portion 60 from being damaged due to the rough surface of the front end surface 12a of the second punch portion 12.

[0206] In the elastic sheet punching system 1 of this example, when manufacturing an annular seal, first, the inner burr portion 61b of the elastic sheet 2 is punched out by the first elastic sheet punching device 3. Next, the elastic sheet 2 is transferred from the first elastic sheet punching device 3 to the second elastic sheet punching device 4. Then, the annular product portion 60 of the elastic sheet 2 is punched out by the second elastic sheet punching device 4.

[0207] In this example, in each of the first elastic sheet punching device 3 and the second elastic sheet punching device 4, deformation of the elastic sheet 2 before and after punching can be prevented or suppressed. Therefore, in the first elastic sheet punching device 3, the first punch head 12 can be prevented or suppressed from contacting the annular product portion 60 adjacent to the inner burr portion 61b of the punching object and damaging the annular product portion 60. In addition, in the first elastic sheet punching device 3, scratches and fractures can be prevented or suppressed on the annular product portion 60 located around the inner burr portion 61b of the punching object. Therefore, when the annular product portion 60 is manufactured by punching twice using the two elastic sheet punching devices 3 and 4, damage to the annular product portion 60 that becomes a seal can be prevented or suppressed. In addition, in the second elastic sheet punching device 4, deformation of the elastic sheet 2 during punching can be prevented or suppressed. Therefore, the second elastic sheet punching device 4 can punch the annular product portion 60 that becomes a seal with high accuracy.

[0208] (Variation Example)

[0209] The first punch portion 12 of the first elastic sheet punching device 3 may be made of resin. In this case, the resin forming the first punch portion 12 may be polyacetal resin, high molecular weight polyethylene resin or fluororesin. Even so, the front end portion 14 of the first punch portion 12 is easy to slide. Therefore, the same effect as the first punch portion 12 described above can be obtained. Here, the second punch portion 12 of the second elastic sheet punching device 4 may also be made of resin.

[0210] (Deformation of the punch plate)

[0211] Fig.14 1 is an illustration of a modified die plate. Fig.14 As shown, in the first elastic sheet punching device 3, the first punch plate 18 can include a punch plate body 150 made of resin; and a metal support plate 151 that supports the punch plate body 150 from the Z1 direction. In this case, the punch plate surface 18a, the inner surface 28a of the punch plate side recess 28, and the inner peripheral wall surface 19a of the first hole 19 located radially outside the front end portion 14 when the first punch head 12 is inserted are provided in the punch plate body 150. The resin forming the punch plate body 150 can be set to polyacetal resin, high molecular weight polyethylene resin or fluororesin. Even so, the punch plate surface 18a, the inner surface 28a of the punch plate side recess 28, and the inner peripheral wall surface 19a of the first hole 19 located radially outside the front end portion 14 when the first punch head 12 is inserted are easy to slide. Therefore, the same effect as the above-mentioned first punch plate 18 can be obtained. Here, the second punch plate 18 of the second elastic sheet punching device 4 may also include a resin punch plate body 150 and a metal support plate 151 that supports the punch plate body 150 from the Z1 direction.

[0212] (Modification of the adsorption part)

[0213] Fig.15 (a) is a cross-sectional view of the adsorption portion of Modification Example 1. Fig.15 (b) is a perspective view of the adsorption portion of Modification 1 as viewed from the Z1 direction. Fig.15 (a) schematically shows a state where the elastic sheet 2 is sucked by the suction portion 73 . Fig.16 (a) is a cross-sectional view of the adsorption portion of Modification Example 2. Fig.16 (b) is a perspective view of the adsorption portion of Modification Example 2 as viewed from the Z1 direction. Fig.16 In (a), the state where the elastic sheet 2 is adsorbed by the adsorption portion 73 is schematically shown. Fig.15 The suction unit 73 of the modified example 1 shown is used as the suction unit 73 of the elastic sheet moving mechanism 54 and the suction unit 73 of the conveying mechanism 56 of the first elastic sheet conveying device 5. The suction unit 73 of this example has a conductive sheet metal member 130 instead of the mesh member 85 and the frame 86. Fig.15 As shown, the sheet metal component 130 is fixed to the lower surface of the suction plate 81 and closes the recess 83 from below. In addition, the sheet metal component 130 has a plurality of air intake ports 72 communicating with the recess 83 at a position overlapping with the recess 83 when viewed from the Z direction. The plurality of air intake ports 72 are formed in a matrix. When viewed from the Z direction, the area in which the plurality of air intake ports 72 are formed in the sheet metal component 130 is smaller than the recess 83. The air intake port 72 is communicated with the ejector 88 via the recess 83, the communication port 84, and the cylinder 82. The lower surface of the sheet metal component 130 is set as a rough surface.

[0214] Here, the lower surface of the sheet metal component 130 is the suction surface 71. In the sheet metal component, the area outside the area where the plurality of air inlets 72 are formed is the frame-shaped portion 71a with which the outer peripheral edge of the elastic sheet 2 contacts when the suction surface 71 suctions the elastic sheet 2. The frame-shaped portion 71a is a rough surface. In this way, the same effect as the suction portion 73 of the elastic sheet moving mechanism 54 and the suction portion 73 of the conveying mechanism 56 can be obtained.

[0215] In addition, if Fig.16As shown in the second modification example, when the elastic sheet 2 is adsorbed, if the suction port 72 is provided only in the opposing area corresponding to the frame-shaped burr portion 61a, it can be used instead of the suction port 73 of the second elastic sheet conveying device. That is, in the suction portion 73 of this example, the sheet metal member 130 that closes the recessed portion 83 has a rectangular portion 71b without the suction port 72 at the center of the adsorption surface 71, a frame-shaped portion 71a without the suction port 72 is provided on the outer peripheral side of the rectangular portion 71b, and the suction port 72 connected to the recessed portion 83 is provided in the rectangular area between the rectangular portion 71b and the frame-shaped portion 71a. The rectangular portion 71b and the frame-shaped portion 71a are rough surfaces. The suction portion 73 of this example can obtain the same effect as the suction portion 73 of the second elastic sheet conveying device 6.

Claims

1. An elastic sheet punching system, characterized in that: The invention provides an elastic sheet punching device, wherein the elastic sheet punching device comprises: a punch plate, wherein the punch plate comprises a plate portion and a punch portion protruding downward from the plate portion; a stripper plate, wherein the stripper plate comprises a through hole through which the punch portion can pass in the up-down direction and is supported by the plate portion in a state in which the punch portion can move in the up-down direction; a force applying member, wherein the force applying member applies force to the stripper plate toward a lower end position of the lower end of the moving range of the stripper plate; and a punching plate, wherein the punching plate is located below the stripper plate and comprises a hole portion capable of receiving a front end portion of the punch portion at a position overlapping with the punch portion when viewed from the up-down direction. If the punch plate is provided with an elastic sheet to be punched, the punch plate is brought close to the punch plate from above, and after the elastic sheet is sandwiched between the stripper plate and the punch plate, the elastic sheet is punched by the punch head protruding downward from the stripper plate, and the front end of the punch head is inserted into the hole, and then the punch plate and the stripper plate are separated upward from the punch plate. A stripping plate side recess and a punching plate side recess are provided on the stripping plate surface of the stripping plate and the punching plate surface facing each other in the up-down direction, and when the stripping plate surface and the punching plate surface are brought into contact with each other, the stripping plate side recess and the punching plate side recess divide a space of a transfer shape to which the shape of the elastic sheet is transferred. The elastic sheet punching system has a first elastic sheet punching device and a second elastic sheet punching device as the elastic sheet punching device, and is provided with: a first elastic sheet conveying device, which supplies the elastic sheet at a predetermined supply position to the punching plate of the first elastic sheet punching device, i.e., the punching plate side recess of the first punching plate; and a second elastic sheet conveying device, which moves the elastic sheet on the first punching plate to the punching plate of the second elastic sheet punching device, i.e., the punching plate side recess of the second punching plate. The punch head of the first elastic sheet punching device, i.e., the first punch head, has a different contour shape when viewed from the top and bottom than the punch head of the second elastic sheet punching device, i.e., the second punch head, when viewed from the top and bottom. The elastic sheet includes: an annular product portion that is formed into an annular seal by punching; and a burr portion other than the annular product portion. The first elastic sheet punching device punches out the inner burr portion of the inner side of the annular product portion in the burr portion by the first punch portion, The second elastic sheet punching device punches out the annular product portion by using the second punch portion.

2. The elastic sheet blanking system according to claim 1, characterized in that: The first elastic sheet conveying device comprises: a first adsorption portion, the first adsorption portion comprising a first adsorption surface and a first suction port provided on the first adsorption surface; a first suction mechanism, the first suction mechanism being connected to the first suction port; a first adsorption portion moving mechanism, the first adsorption portion moving mechanism moving the first adsorption portion; and a first conveying control portion, the first conveying control portion driving and controlling the first suction mechanism and the first adsorption portion moving mechanism. The first conveying control unit makes the first adsorption surface face the elastic sheet at the predetermined supply position with a gap therebetween, drives the first suction mechanism to adsorb the elastic sheet to the first adsorption surface, moves the first adsorption unit to configure the first adsorption surface above the recessed portion on the punch plate side of the first punch plate, and stops the first suction mechanism.

3. The elastic sheet blanking system according to claim 2, characterized in that: The burr portion includes: a frame-shaped burr portion provided along the entire periphery of the outer peripheral edge of the elastic sheet; The annular product portion is located on the inner circumference side of the frame-shaped burr portion, The second elastic sheet conveying device comprises: a second adsorption portion, the second adsorption portion comprises a second adsorption surface and a second suction port provided on the second adsorption surface; a second suction mechanism, the second suction mechanism is connected to the second suction port; a second adsorption portion moving mechanism, the second adsorption portion moving mechanism moves the second adsorption portion; and a second conveying control portion, the second conveying control portion drives and controls the second suction mechanism and the second adsorption portion moving mechanism. The second transport control unit makes the second adsorption surface face the elastic sheet arranged on the punch plate side recess of the first punch plate with a gap therebetween, drives the second suction mechanism to adsorb the elastic sheet to the second adsorption surface, moves the second adsorption unit to make the second adsorption surface be located above the punch plate side recess of the second punch plate, and then stops the second suction mechanism. The second air suction port is provided in a frame-shaped opposing region facing the frame-shaped burr portion on the second suction surface.

4. The elastic sheet blanking system according to claim 1, characterized in that: The punch plate includes a metal punch plate body and a fluorine-containing resin coating provided on a surface of the punch plate body. The punch plate surface, the inner surface of the punch plate side recess, and the inner peripheral wall surface of the hole portion located radially outside the punch head portion when the punch head portion is inserted are covered with the coating.

5. The elastic sheet blanking system according to claim 1, characterized in that: The punch plate includes a resin punch plate body and a metal support plate that supports the punch plate body from below. The punch plate surface, the inner surface of the punch plate side recess, and the inner peripheral wall surface of the hole portion located radially outward of the punch head when the punch head is inserted are provided on the punch plate body portion.

6. The elastic sheet blanking system according to claim 1, characterized in that: The punch plate surface and the inner surface of the punch plate side recess are rough surfaces, and when the ten-point average roughness is set as D, the following conditional expression is satisfied: 5μm≤D≤40μm.

7. The elastic sheet blanking system according to claim 1, characterized in that: The front end portion of the punch head includes a punching portion and a column portion in order from the front end toward the upper side, and the column portion is located inside the punching portion when viewed from the up-down direction.

8. The elastic sheet blanking system according to claim 1, characterized in that: The front end surface of the punch portion is a rough surface.

9. The elastic sheet blanking system according to claim 1, characterized in that: The punch portion is made of resin.

10. The elastic sheet blanking system according to claim 1, characterized in that: The punch head has a central protrusion at the center of the front end surface, which protrudes downward from the outer peripheral edge of the front end surface. The front end of the central protruding portion is a plane perpendicular to the axis of the punch portion.

11. The elastic sheet blanking system according to claim 1, characterized in that: have: a lifting mechanism that lifts the punch plate between a standby position where the stripper plate is separated from the punch plate surface toward the upper side and a punching completion position where the front end portion of the punch head is inserted into the hole; and a punching control unit, the punching control unit drives and controls the lifting mechanism, The punching control unit sets a second speed at which the punch plate is returned from the punching end position to the standby position to be slower than a first speed at which the punch plate is moved from the standby position to the punching end position.

12. The elastic sheet blanking system according to claim 1, characterized in that: The surface of the stripper plate and the inner surface of the recessed portion on the stripper plate side are rough surfaces.

13. The elastic sheet blanking system according to claim 1, characterized in that: A recovery mechanism is provided for recovering the punched portion punched from the elastic sheet, The recovery mechanism comprises: a recovery box, which is arranged below the punching plate and communicated with the hole; an air suction mechanism, which has an air suction port communicated with the recovery box; and an air suction mechanism control unit, which drives and controls the air suction mechanism. The suction mechanism control unit drives the suction mechanism while the stripper plate is in contact with the punch plate.

14. The elastic sheet blanking system according to claim 1, characterized in that: An elastic sheet removing mechanism is provided, and the elastic sheet removing mechanism blows the elastic sheet arranged in the recessed portion on the punch plate side outward from the punch plate.

15. The elastic sheet blanking system according to claim 1, characterized in that: The elastic sheet is made of elastic.

16. The elastic sheet blanking system according to claim 1, characterized in that: The elastic sheet is retained at a retention position before being supplied to the elastic sheet punching device. The retention position is set in a temperature tank, and the temperature tank has a temperature adjustment mechanism for adjusting the temperature in the tank.

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