How to remove the rubber sheet

Abstract

To provide a technology that can promptly pull off the extruded rubber sheet from the calender roll and grasp it, as well as properly release the grasped rubber sheet.SOLUTION: The method of taking out a rubber sheet S consists of the processes of: bringing the pair of jaws 20 of the gripping mechanism 4 that grips the rubber sheet S into the first open state where the distance between the tips of the pair of jaws 20 is a first interval; sliding the tips of the pair of jaws 20 in the first open state against the outer circumferential surfaces of the pair of calender rolls 2a, 2b, and pulling a tip s1 of the rubber sheet S off the pair of calender rolls 2a, 2b; having the gripping mechanism 4 grip the tip s1 of the pulled off rubber sheet S; moving the gripping mechanism 4 to the upper part of the carrying out device 8; and placing the pair of jaws 20 in a second open state where the distance between the tips of the pair of jaws 20 is a second interval wider than the first interval when the gripping mechanism 4 reaches a target position, and releasing the rubber sheet S.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a method for removing a rubber sheet extruded from a calender roll device. [Background technology]

[0002] Patent Document 1 discloses a rubber sheet take-out device that takes out a rubber sheet extruded from a calender roll device and guides the rubber sheet to a carry-out device provided downstream of the calender roll device. This rubber sheet take-out device includes a gripping device having a pair of upper and lower claws. The pair of claws can be opened and closed by selectively adopting either a closed leg state in which the tips of the pair of claws are closed, or an open leg state in which the tips of the pair of claws are separated from each other. In the closed leg state, the pair of claws can grip the rubber sheet.

[0003] To take out a rubber sheet using the rubber sheet take-out device, first, the pair of claws are opened and the tips of the pair of claws in the opened state are brought into sliding contact with the outer circumferential surfaces of a pair of calendar rolls. Thereafter, the rubber sheet is extruded from the gap between the pair of rotating calendar rolls, with the leading end of the rubber sheet in the initial stage of extrusion adhering to one of the pair of calendar rolls.

[0004] In contrast, in the above-mentioned rubber sheet removal device, the tips of a pair of claws are brought into sliding contact with the outer peripheral surface of the rotating calendar roll, so that the tip of the rubber sheet adhering to the calendar roll can be pulled off by the pair of claws.

[0005] When the leading end of the rubber sheet is peeled off by the pair of claws, the pair of claws are brought into a closed state, causing the gripping device to grip the leading end of the rubber sheet. Thereafter, the gripping device is moved above the carrying-out device, and the pair of claws is opened to release the leading end of the rubber sheet above the carrying-out device. In this manner, the rubber sheet is guided to the carrying-out device. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2002-52557 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, if the portion of the rubber sheet that adheres to the calendar roll and is pulled off becomes long, there is a high possibility that the tip of the rubber sheet will become curled or folded, which creates a risk that the tip of the rubber sheet will not be able to be securely gripped by the pair of claw portions. For this reason, in order to shorten the portion of the rubber sheet that is attached to the calender rolls as much as possible, it is necessary to peel the rubber sheet extruded from the calender roll device from the calender rolls as quickly as possible.

[0008] In contrast, by narrowing the distance between the tips of the pair of claws in the open state, the positions of the pair of claws when they are in sliding contact with the outer circumferential surfaces of the pair of calendar rolls can be brought closer to the gap between the pair of calendar rolls, and the extruded rubber sheet can be quickly peeled off from the calendar rolls. This allows the rubber sheet to be peeled off from the calendar rolls while the circumferential distance of the rubber sheet adhering to the calendar rolls is relatively short, and curling or folding that occurs at the tip of the rubber sheet can be suppressed.

[0009] On the other hand, if the distance between the tips of the pair of claws in the open leg state is narrowed, the tip of the rubber sheet may get caught on the pair of claws when releasing the tip of the rubber sheet. If such a catch occurs, the rubber sheet may not be released or the released rubber sheet may be unnecessarily bent on the discharge device, resulting in the risk of not being released properly.

[0010] The present invention has been made in consideration of the above circumstances, and aims to provide a technology that can quickly peel off and grip an extruded rubber sheet from a calendar roll, and also can properly release the gripped rubber sheet. [Means for solving the problem]

[0011] The present invention relates to A method for extracting a rubber sheet extruded from a gap between a pair of upper and lower calendar rolls, comprising the steps of: a step of setting a pair of upper and lower openable claw portions of a gripping mechanism that grips the rubber sheet in a first open state in which a distance between tips of the pair of claw portions is a first distance; a step of moving the gripping mechanism to bring the tips of the pair of claw portions in the first open state into sliding contact with the outer circumferential surfaces of the pair of calendar rolls, and peeling off the tip portions of the rubber sheet, which are pushed out through the gaps and attached to the pair of calendar rolls, from the pair of calendar rolls; a step of causing the pair of claw portions to be in a closed state with tips of the pair of claw portions being closed, thereby causing the gripping mechanism to grip the tip portion of the peeled rubber sheet; a step of moving the gripping mechanism gripping the leading end of the rubber sheet to above a conveying device provided downstream of the pair of calendar rolls; when the gripping mechanism reaches a target position above the discharge device, the pair of claws are brought into a second open state in which a distance between tips of the pair of claws is a second distance wider than the first distance, thereby releasing the tip portion of the rubber sheet; Includes.

[0012] According to the above configuration, the distance between the tips of the pair of claw portions in the process of peeling the tip portion of the rubber sheet from the pair of calendar rolls is set to a first distance, and the distance between the tips of the pair of claw portions in the process of releasing the tip portion of the rubber sheet is set to a second distance wider than the first distance, so that the first distance can be made as narrow as possible without considering the process of releasing the tip portion of the rubber sheet. As a result, in the process of peeling off the leading end of the rubber sheet from the pair of calendar rolls, the position of the leading ends of the pair of claw portions when they are brought into sliding contact with the outer peripheral surfaces of the pair of calendar rolls can be brought closer to the gap between the pair of calendar rolls, and the extruded rubber sheet can be quickly peeled off from the calendar rolls. In addition, in the step of releasing the leading end of the rubber sheet, the second interval can be set as wide as possible without considering the step of peeling the leading end of the rubber sheet from the pair of calendar rolls. Therefore, when releasing the leading end of the rubber sheet, the leading end of the rubber sheet can be prevented from being caught by the pair of claws, and the rubber sheet can be appropriately released. In this manner, according to the above-described configuration, the extruded rubber sheet can be quickly peeled off from the calendar rolls and gripped, and the gripped rubber sheet can be appropriately released.

[0013] In the above method, The step of releasing the tip portion of the rubber sheet includes: It is preferable that the method further includes, when the gripping mechanism reaches the target position, a step of holding the rubber sheet between the pressure roller and the discharge device by the pressure roller pressing the rubber sheet from above toward the discharge device before the pair of claw portions are brought into the second open state. In this case, before the leading end of the rubber sheet is released, the rubber sheet is held between the pressure roller and the carrying-out device, so that the released rubber sheet can be reliably placed on the carrying-out device and the rubber sheet can be carried out by the carrying-out device.

[0014] In the above method, When the radius of the pair of calender rolls is r, the first gap is preferably 0.6r or less. If the first gap is larger than 0.6r, the distance from the tips of the pair of claws to the gap between the pair of calendar rolls when the rubber sheet is in sliding contact with the outer circumferential surfaces of the pair of calendar rolls becomes large, and the portion of the rubber sheet that adheres to the calendar rolls becomes long, and therefore the portion that is peeled off also becomes long, increasing the possibility that the tip of the rubber sheet will be curled or folded. By setting the first interval to 0.6r or less, the positions of the tips of the pair of claws when they are in sliding contact with the outer circumferential surfaces of the pair of calendar rolls can be brought sufficiently close to the gap between the pair of calendar rolls, and the length of the portion of the rubber sheet that adheres to the calendar rolls and is peeled off can be shortened. As a result, the tip of the rubber sheet can be effectively prevented from curling or folding, and the tip of the rubber sheet can be reliably gripped by the pair of claws. Effect of the Invention

[0015] According to the present invention, the extruded rubber sheet can be quickly peeled off from the calendar rolls and gripped, and the gripped rubber sheet can be appropriately released. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a perspective view showing an example of a rubber sheet take-out device according to an embodiment. [Diagram 2] FIG. 2 is a side view of the rubber sheet take-out device. [Diagram 3] FIG. 3(a) is a side view of the gripping mechanism, and FIG. 3(b) is a top view of the gripping mechanism. [Figure 4] FIG. 4 is a diagram showing a main part of the gripping part. [Diagram 5] FIG. 5 is a flow chart showing the contents of the removal operation. [Figure 6] FIG. 6(a) is a diagram showing a state in which a pair of claw portions are in sliding contact with a pair of calendar rolls, which is the first open state, and FIG. 6(b) is a diagram showing a state in which the leading end of a rubber sheet is gripped by the gripping portion. [Figure 7]FIG. 7 is a side view of the take-out device when the gripping mechanism has been moved to the target position. [Figure 8] FIG. 8 is a diagram showing the gripping mechanism in the second open state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, preferred embodiments will be described with reference to the drawings. [Overall configuration of the rubber sheet take-out device] FIG. 1 is a perspective view showing an example of a rubber sheet take-out device according to an embodiment, and FIG. 2 is a side view of the rubber sheet take-out device. This rubber sheet removal device 1 (hereinafter also referred to as the removal device 1) is a device that removes a rubber sheet extruded from a calendar roll device 2, and is equipped with a gripping mechanism 4 that grips the tip portion s1 of the rubber sheet S, a moving mechanism 6 that moves the gripping mechanism 4, and a discharge device 8 for discharging the rubber sheet S.

[0018] The calender roll device 2 includes a pair of upper and lower calender rolls 2a and 2b. The pair of calender rolls 2a and 2b have the same outer diameter and longitudinal dimensions, and are arranged parallel to each other. The pair of calender rolls 2a and 2b are rotatable about their central axes, and are driven by a driving mechanism (not shown). A small gap T is provided between an outer circumferential surface 2a1 of the calendar roll 2a and an outer circumferential surface 2b1 of the calendar roll 2b. The calendar roll device 2 is supplied with kneaded rubber from, for example, a rubber extruder G installed on the left side of the page in Fig. 2. The kneaded rubber is supplied to the gap T between the pair of calendar rolls 2a and 2b, and is rolled and extruded as a rubber sheet S.

[0019] In this embodiment, the rubber sheet S extruded from the calender roll device 2 is discharged from the left side to the right side of the paper in Fig. 2. In the following description, the direction from the left side to the right side of the paper is also referred to as the discharge direction. In FIG. 2, the direction in which the rubber sheet S is extruded by the calender roll device 2, indicated by an arrow Y, is inclined downward from the calender roll device 2 toward the downstream side in the discharge direction.

[0020] The discharge device 8 is a conveyor having an endless mesh belt 8a, and is provided after the calendar roll device 2 (downstream in the discharge direction). The discharge device 8 extends almost horizontally along the discharge direction. The discharge device 8 extends from the vicinity of the calendar roll device 2 to the next process line, and discharges the rubber sheet S to the next process line by running the mesh belt 8a along the discharge direction. The running speed of the mesh belt 8 a is controlled so as to coincide with the extrusion speed of the calender roll device 2 .

[0021] The moving mechanism 6 includes a pair of rails 12 and a drive unit 14 for moving the gripping mechanism 4 along the pair of rails 12. The pair of rails 12 extend in an upward inclination toward the downstream side in the unloading direction. The pair of rails 12 are supported by supports 13 erected on the installation surface, and are disposed above the unloading device 8. One end 12a of the pair of rails 12 is located between the calendar roll device 2 and one end of the discharge device 8. When the gripping mechanism 4 is in the gripping position of one end 12a of the pair of rails 12, it grips the leading end s1 of the rubber sheet S. The gripping mechanism 4 can move along a pair of rails 12 between a gripping position and above the discharge device 8 .

[0022] The drive unit 14 includes a pair of sprockets (not shown) provided on both ends of each of the pair of rails 12, an endless chain (not shown) stretched between the pair of sprockets, and a motor M that drives the chain. The gripping mechanism 4 is fixed to the chain. The chain is driven by a torque output by a motor M and travels between a pair of sprockets. In this way, the drive unit 14 moves the gripping mechanism 4 along the pair of rails 12.

[0023] The gripping mechanism 4 includes a carriage portion 16 that runs on a pair of rails 12 and a gripping portion 18 that grips the rubber sheet S. FIG. 3(a) is a side view of the gripping mechanism 4, and FIG. 3(b) is a top view of the gripping mechanism 4. As shown in FIG. As shown in Fig. 3(a) and Fig. 3(b), the carriage unit 16 has a frame-shaped frame 16a made of metal. The frame 16a has a pair of girder parts 16a1 and a beam part 16a2 connecting the pair of girder parts 16a1. Wheels 16b for running on the pair of rails 12 are provided on the side surfaces of the pair of girder parts 16a1. As described above, the frame 16a is fixed to the chain of the driving unit 14. As a result, the frame 16a runs along the pair of rails 12 by the driving unit 14. The frame 16a runs such that the longitudinal direction of the girder 16a1 is aligned with the longitudinal direction of the rail 12.

[0024] A support shaft 16c is provided at one end of the girder 16a1 in the longitudinal direction, supporting the grip portion 18. The axis of the support shaft 16c is parallel to a direction perpendicular to the longitudinal direction of the girder 16a1, and the support shaft 16c is rotatable about the axis. The gripping portion 18 is fixed to the support shaft 16c and rotates integrally with the support shaft 16c. An air cylinder 16d is provided above the frame 16a. The air cylinder 16d connects the beam 16a2 of the frame 16a to the support shaft 16c, and rotates the support shaft 16c by expanding and contracting. As a result, the gripping portion 18 rotates around the axis of the support shaft 16c by the expansion and contraction of the air cylinder 16d. In this way, the inclination of the arm 18a1 of the gripping portion 18 in the longitudinal direction can be adjusted by the air cylinder 16d.

[0025] The gripping portion 18 includes a frame 18a made of metal, an air cylinder 18b fixed to the frame 18a, and a pair of claw portions 20. The frame 18a has a pair of arms 18a1 and a beam 18a2 connecting the pair of arms 18a1. The beam 18a2 extends in a width direction perpendicular to the longitudinal direction of the pair of arms 18a1. The air cylinder 18b includes a main body 18b1 and a cylinder rod 18b2 that extends and retracts from the main body 18b1 along the longitudinal direction of the arm 18a1. The main body 18b1 is fixed to the support shaft 16c of the cart 16. The tip of the cylinder rod 18b2 is fixed to the beam 18a2. Thus, when the cylinder rod 18b2 of the air cylinder 18b is extended and retracted, the gripper 18 moves along the longitudinal direction of the arm 18a1 relative to the cart 16. In this manner, the position of the gripper 18 relative to the cart 16 can be adjusted by the air cylinder 18b.

[0026] The pair of claws 20 are provided protruding from one end of the pair of arm portions 18a1 in the longitudinal direction. The pair of claws 20 are provided on a pair of upper and lower shafts 26 provided at one end of the pair of arm portions 18a1 in the longitudinal direction. The pair of shafts 26 are provided so as to extend parallel to the width direction. The axial centers of the pair of shafts 26 are parallel to the width direction, and the pair of shafts 26 are rotatable around the axial centers. Of the pair of claw portions 20, the upper claw portion 20 is provided on the upper shaft 26, and the lower claw portion 20 is provided on the lower shaft 26.

[0027] Each of the claw portions 20 has a rectangular claw body 22 and four arms 24 connecting the claw body 22 to a shaft 26 . The arm 24 is provided along the longitudinal direction of the arm portion 18a1 and protrudes from the shaft 26. The claw body 22 is provided at the tip of the arm 24. The pair of claws 20 can be rotated by the pair of shafts 26. Therefore, the tips of the pair of claws 20 can be opened and closed up and down.

[0028] The long sides of the claw body 22 are parallel to the width direction. The claw portion 20 further has a tip member 22a provided on the claw body 22. The tip member 22a is a plate-like member made of, for example, rubber, resin, or the like. The tip member 22 a of the upper claw portion 20 is provided on the lower surface of the claw body 22 , and the tip member 22 a of the lower claw portion 20 is provided on the upper surface of the claw body 22 . The tip member 22a is provided to slightly protrude from the tip edge of the long side of the claw body 22. The tip member 22a protrudes from the claw body 22 and has a tip portion 22a1 that constitutes the tip of the claw portion 20 and is formed sharp.

[0029] The gripping portion 18 further includes a pair of pinions 28 provided on the pair of shafts 26, a rack 30 disposed between the pair of pinions 28, and an air cylinder 32. The pair of pinions 28, the rack 30, and the air cylinder 32 have the function of opening and closing the pair of claw portions 20 by driving the pair of shafts 26 to rotate.

[0030] FIG. 4 is a diagram showing the main parts of the gripping portion 18, and shows the pair of claw portions 20, the pair of pinions 28, the rack 30, and the air cylinder 32. 4, a center line C is a straight line that is parallel to the longitudinal direction of the arm portion 18a1 and passes through a midpoint P0 between the centers of the pair of shafts 26. The pair of claw portions 20 rotate symmetrically about the center line C to open and close.

[0031] In FIG. 4, a pair of pinions 28 are fixed to a pair of shafts 26 and rotate integrally with the pair of shafts 26. The rack 30 has teeth on both its upper and lower surfaces, and meshes with both of the pair of pinions 28. The rack 30 is provided on a cylinder rod 32a of an air cylinder 32. The air cylinder 32 is provided on the beam portion 18a2, and causes a cylinder rod 32a to expand and contract in a direction parallel to the center line C toward the pair of claw portions 20 side. Therefore, the air cylinder 32 can move the rack 30 back and forth parallel to the center line C. When the rack 30 moves back and forth, the pair of pinions 28 that mesh with the rack 30 rotate in opposite directions by the same angle. When the pair of pinions 28 rotate in opposite directions by the same angle, the pair of claws 20 open and close symmetrically with respect to the center line C. In this manner, the pair of claws 20 are opened and closed symmetrically with respect to the center line C by the air cylinder 32 .

[0032] 4 shows a case where the pair of claws 20 are in a closed state in which they are close to each other. In the closed state, the tip portions 22a1 of the pair of claws 20 are almost closed. A gap is provided between the pair of claw bodies 22 to the extent that the rubber sheet S can be gripped. As will be explained later, the pair of claws 20 can select two open states: a first open state in which the distance between the tips of the pair of claws 20 is a first distance, and a second open state in which the distance between the tips of the pair of claws 20 is a second distance that is wider than the first distance.

[0033] Returning to FIG. 1, the take-out device 1 includes a pressure roller 40 and an air cylinder 42 for moving the pressure roller 40 back and forth. The pressure roller 40 and the air cylinder 42 are mounted on an upper stand 44 which is attached to the support 13 . The pressure roller 40 is disposed above the mesh belt 8a of the discharge device 8, and holds the rubber sheet S on the mesh belt 8a by pressing down from above the rubber sheet S extended from the calender roll device 2. The air cylinder 42 moves the pressure roller 40 back and forth in the vertical direction.

[0034] [About removal work] Next, the operation of taking out the rubber sheet S extruded from the calender roll device 2 will be described. FIG. 5 is a flow chart showing the contents of the removal operation. First, an operator moves the gripping mechanism 4 to grip the rubber sheet S extruded from the calender roll device 2 (step S1 in FIG. 5). As shown in FIG. 2, the worker moves the gripping mechanism 4 to the gripping position and operates the air cylinder 16d to adjust the inclination of the gripping portion 18 of the gripping mechanism 4 so that the center line C (FIG. 4) of the gripping portion 18 is aligned with the extrusion direction of the rubber sheet S by the calendar roll device 2.

[0035] Next, the worker operates the gripping mechanism 4 so that the pair of claw portions 20 is in the first open state (step S2 in FIG. 5). Furthermore, the worker operates the calender roll device 2 and the discharge device 8, and moves the gripping portion 18 of the gripping mechanism 4 to bring the tips of the pair of claws 20 into sliding contact with the outer circumferential surfaces 2a1, 2b1 of the pair of calender rolls 2a, 2b. At this time, the worker operates the air cylinder 18b to move the gripping portion 18 parallel to the longitudinal direction of the arm portion 18a1, and brings the gripping portion 18 close to the pair of calender rolls 2a, 2b, and brings the tips of the pair of claws 20 in the first open state into sliding contact with the outer circumferential surfaces 2a1, 2b1.

[0036] FIG. 6(a) is a diagram showing a state in which the pair of claw portions 20 are in sliding contact with the pair of calender rolls 2a, 2b, which is the first open state. As shown in Fig. 6(a), the rubber sheet S extruded between the pair of calendar rolls 2a and 2b is extruded while adhering to the outer circumferential surfaces 2a1 and 2b1 of the pair of rotating calendar rolls 2a and 2b. Fig. 6(a) shows a state in which the rubber sheet S is adhered to the upper calendar roll 2a. As shown in Figure 6(a), the worker slides the pair of claw portions 20, which are in the first open state, against the outer peripheral surfaces 2a1, 2b1 of the pair of calendar rolls 2a, 2b to peel off the leading end portion s1 of the rubber sheet S from the calendar roll 2a (step S3 in Figure 5).

[0037] The tip portion s1 of the peeled rubber sheet S is pushed out along the pushing direction and advances between the pair of claw portions 20. In FIG. 6(a), the lower limit of the first interval k1 between the tips (tip 22a1 of tip member 22a) of the pair of claws 20 in the first open state is set to a dimension that allows the tip s1 of the rubber sheet S peeled off from the pair of calendar rolls 2a, 2b and extruded to advance between the pair of claws 20. More specifically, in consideration of the clearance between the pair of claws 20 and the rubber sheet S, it is preferable that the lower limit of the first interval k1 is twice the thickness of the rubber sheet S. If the first interval k1 is smaller than twice the thickness of the rubber sheet S, there is a risk that the extruded rubber sheet S cannot advance between the pair of claws 20. By setting the lower limit of the first interval k1 to twice the thickness of the rubber sheet S, it is possible to prevent the advance of the extruded rubber sheet S from being hindered. In addition, when the radius of the calendar rolls 2a and 2b is r, the first interval k1 is set to 0.6r or less. This allows the tips of the pair of claw portions 20 to be sufficiently close to the gap T between the pair of calendar rolls 2a and 2b when the pair of claw portions 20 is brought into sliding contact with the pair of calendar rolls 2a and 2b.

[0038] More specifically, when the first interval k1 is 0.6r, the angle θ between a straight line L1 passing through the axial centers P1, P2 of the pair of calendar rolls 2a, 2b and a straight line L2 passing through the axial center P2 and a contact point P3 between the tip of the lower claw portion 20 and the outer circumferential surface 2b1 of the calendar roll 2b is about 45 degrees. As a result, the arc distance along the outer circumferential surfaces 2a1, 2b1 of the calendar rolls 2a, 2b from the tip of the pair of claw portions 20 when they are in sliding contact with the pair of calendar rolls 2a, 2b to the gap T between the pair of calendar rolls 2a, 2b is about 1 / 8 of the circumference of the calendar rolls 2a, 2b. By setting the first interval to 0.6r or less, the arc distance along the outer peripheral surfaces 2a1, 2b1 of the calendar rolls 2a, 2b from the tips of the pair of claw portions 20 when they are in sliding contact with the pair of calendar rolls 2a, 2b to the gap T between the pair of calendar rolls 2a, 2b is 1 / 8 or less of the circumference of the calendar rolls 2a, 2b, and the length of adhesion of the rubber sheet S to the calendar rolls 2a, 2b can be kept to 1 / 8 or less of the circumference of the calendar rolls 2a, 2b.

[0039] If the first interval k1 is larger than 0.6r, the arc distance from the tips of the pair of claw portions 20 to the gap T between the pair of calendar rolls 2a, 2b when the pair of calendar rolls 2a, 2b are in sliding contact with the outer circumferential surfaces 2a1, 2b1 of the pair of calendar rolls 2a, 2b becomes large, and the portion of the rubber sheet S that adheres to the calendar rolls 2a, 2b becomes long. Therefore, the portion that is peeled off also becomes long, and the tip portion s1 of the rubber sheet S is likely to be curled or folded. By setting the first interval to 0.6r or less, the positions of the tips of the pair of claw portions 20 when they are in sliding contact with the outer circumferential surfaces 2a1, 2b1 of the pair of calendar rolls 2a, 2b can be brought sufficiently close to the gap T between the pair of calendar rolls 2a, 2b, and the length of the portion of the rubber sheet S that adheres to and is peeled off from the calendar rolls 2a, 2b can be shortened. As a result, the tip portion s1 of the rubber sheet S can be effectively prevented from curling or folding.

[0040] When the leading end portion s1 of the rubber sheet S peeled off from the calendar roll 2a is pushed out and advances between the pair of claw portions 20, the worker closes the pair of claw portions 20 and causes the leading end portion s1 of the rubber sheet S to be gripped by the gripping portion 18, as shown in FIG. 6(b) (step S4 in FIG. 5).

[0041] Next, the worker moves the gripping mechanism 4 gripping the rubber sheet S to above the carry-out device 8 (step S5 in FIG. 5). The worker moves the gripping portion 18 parallel to the longitudinal direction of the arm portion 18a1 to move the gripping portion 18 away from the pair of calendar rolls 2a, 2b, and adjusts the inclination of the gripping portion 18 so that the longitudinal direction of the arm portion 18a1 of the gripping portion 18 is approximately parallel to the longitudinal direction of the pair of rails 12. Thereafter, the worker moves the gripping mechanism 4 along the pair of rails 12. The worker moves the gripping mechanism 4 to a preset target position above the carry-out device 8. At this time, the gripping mechanism 4 moves at approximately the same speed as the extrusion speed of the rubber sheet S.

[0042] FIG. 7 is a side view of the take-out device 1 when the gripping mechanism 4 has been moved to the target position. The target position is a position on the pair of rails 12 where the gripping mechanism 4 is on the mesh belt 8a of the discharge device 8. The rubber sheet S is extended from the calender roll device 2 to a gripping mechanism 4 located at a target position.

[0043] Next, the worker holds the rubber sheet S on the mesh belt 8a of the discharge device 8 by the pressing roller 40, and then releases the rubber sheet S (step S6 in FIG. 5). The worker operates the air cylinder 42 to move the pressure roller 40 downward, thereby pressing the rubber sheet S from above against the mesh belt 8a. As a result, the rubber sheet S is pressed by the pressure roller 40 and bent downward as indicated by the dashed line H in FIG. 7, and is sandwiched between the pressure roller 40 and the mesh belt 8a and held on the mesh belt 8a. Thereafter, the worker operates the gripping mechanism 4 so that the pair of claw portions 20 is in the second open state. As a result, the gripping mechanism 4 releases the tip portion s1 of the rubber sheet S. In this embodiment, before the leading end portion s1 of the rubber sheet S is released, the rubber sheet S is held between the pressure roller 40 and the discharge device 8, so that the released rubber sheet S can be reliably placed on the mesh belt 8a of the discharge device 8.

[0044] As described above, the running speed of the mesh belt 8a is controlled so as to match the extrusion speed of the calender roll device 2. Thus, the rubber sheet S is carried out by the carry-out device 8 to the next process while being extruded from the calender roll device 2.

[0045] FIG. 8 is a diagram showing the gripping mechanism 4 in the second open state. The second distance k2 between the tips (tip portion 22a1 of tip member 22a) of the pair of claw portions 20 in the second open state is set wider than the first distance k1 in the first open state, and is set to a value that can reliably release the tip portion s1 of the gripped rubber sheet S.

[0046] In this embodiment, the distance between the tips of the pair of claw portions 20 in the process of peeling the tip portion s1 of the rubber sheet S from the pair of calendar rolls 2a, 2b (step S3 in Figure 5) is set to a first distance k1, and the distance between the tips of the pair of claw portions 20 in the process of releasing the tip portion s1 of the rubber sheet S (step S6 in Figure 5) is set to a second distance k2 wider than the first distance k1.Therefore, the first distance k1 can be made as narrow as possible without considering the process of releasing the tip portion s1 of the rubber sheet S. As a result, in the process of peeling off the tip portion s1 of the rubber sheet S from the pair of calendar rolls 2a, 2b, the positions of the tips of the pair of claw portions 20 when they are brought into sliding contact with the outer peripheral surfaces 2a1, 2b1 of the pair of calendar rolls 2a, 2b can be brought closer to the gap T between the pair of calendar rolls 2a, 2b, and the extruded rubber sheet S can be quickly peeled off from the calendar rolls 2a, 2b. Therefore, the portion of the rubber sheet S that is attached to the calendar roll 2a and peeled off can be shortened, and curling or folding that occurs at the tip portion s1 of the rubber sheet S can be suppressed. As a result, the tip portion s1 of the rubber sheet S can be securely gripped by the pair of claw portions 20.

[0047] Furthermore, in the process of releasing the leading end portion s1 of the rubber sheet S, the second interval k2 can be set as wide as possible without considering the process of peeling the leading end portion s1 of the rubber sheet S from the pair of calendar rolls 2a, 2b. Therefore, when releasing the leading end portion s1 of the rubber sheet S, it is possible to prevent the leading end portion s1 of the rubber sheet S from being caught by the pair of claw portions 20, and the leading end portion s1 of the rubber sheet S can be appropriately released.

[0048] In this manner, according to the above-described configuration, the extruded rubber sheet S can be quickly peeled off from the calendar rolls 2a and 2b and gripped, and the gripped rubber sheet S can be appropriately released.

[0049] 〔others〕 It should be noted that the embodiments disclosed herein are illustrative in all respects and are not restrictive. The scope of the present disclosure is defined by the claims, not by the meaning described above, and is intended to include all modifications having a meaning equivalent to the claims and within the scope thereof. [Explanation of symbols]

[0050] 1 Rubber sheet removal device 2. Calendar roll device 2a Calendar roll 2a1 Outer surface 2b Calendar roll 2b1 Outer surface 4 Gripping mechanism 6 Moving mechanism 8 Unloading device 8a Mesh belt 12 Rail 12a One end 13 Posts 14 Drive unit 16 Bogie section 16a Frame 16a1 girder part 16a2 Beam section 16b wheels 16c support shaft 16d Air Cylinder 18 Gripping part 18a Frame 18a1 Arm 18a2 Beam section 18b Air cylinder 18b1 Main body 18b2 Cylinder rod 20 Claw part 22 Claw body 22a Tip member 22a1 Tip 24 Arm 26 Shaft 28 Pinion 30 racks 32 Air Cylinder 32a Cylinder rod 40 Presser roller 42 Air Cylinder 44 Upper frame C center line H dashed line k1 First interval k2 Second interval L1 straight line L2 straight line Medium motor P0 midpoint P1 axis center P2 axis center P3 contact point S rubber sheet s1 tip T Gap Y Arrow θ angle

Claims

1. A method for extracting a rubber sheet extruded from a gap between a pair of upper and lower calendar rolls, comprising the steps of: a step of setting a pair of upper and lower openable claw portions of a gripping mechanism that grips the rubber sheet in a first open state in which a distance between tips of the pair of claw portions is a first distance; a step of moving the gripping mechanism to bring the tips of the pair of claws in the first open state into sliding contact with the outer circumferential surfaces of the pair of calendar rolls, and peeling off the tip portions of the rubber sheet, which are pushed out through the gaps and attached to the pair of calendar rolls, from the pair of calendar rolls; a step of causing the pair of claw portions to be in a closed state with tips of the pair of claw portions being closed, thereby causing the gripping mechanism to grip the tip portion of the peeled rubber sheet; a step of moving the gripping mechanism gripping the leading end of the rubber sheet to above a conveying device provided downstream of the pair of calendar rolls; when the gripping mechanism reaches a target position above the discharge device, the pair of claws are brought into a second open state in which a distance between tips of the pair of claws is a second distance wider than the first distance, thereby releasing the tip end of the rubber sheet; Including, The step of releasing the tip portion of the rubber sheet includes: When the gripping mechanism reaches the target position, before the pair of claw portions are brought into the second open state, the method further includes a step of holding the rubber sheet between the pressure roller and the discharge device by a pressure roller that presses the rubber sheet from above toward the discharge device. How to remove the rubber sheet.

2. A method for removing a rubber sheet extruded from a gap between a pair of upper and lower calendar rolls, comprising the steps of: a step of setting a pair of upper and lower openable claw portions of a gripping mechanism that grips the rubber sheet in a first open state in which a distance between tips of the pair of claw portions is a first distance; a step of moving the gripping mechanism to bring the tips of the pair of claws in the first open state into sliding contact with the outer circumferential surfaces of the pair of calendar rolls, and peeling off the tip portions of the rubber sheet, which are pushed out through the gaps and attached to the pair of calendar rolls, from the pair of calendar rolls; a step of causing the pair of claw portions to be in a closed state with tips of the pair of claw portions being closed, thereby causing the gripping mechanism to grip the tip portion of the peeled rubber sheet; a step of moving the gripping mechanism gripping the leading end of the rubber sheet to above a conveying device provided downstream of the pair of calendar rolls; when the gripping mechanism reaches a target position above the discharge device, the pair of claws are brought into a second open state in which a distance between tips of the pair of claws is a second distance wider than the first distance, thereby releasing the tip end of the rubber sheet; Including, When the radius of the pair of calender rolls is r, the first interval is 0.6r or less. How to remove the rubber sheet.

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