Injection molding machine

Abstract

The invention provides an injection molding machine, which is provided with a safety protection device for limiting invasion from a molded product taking-out area to a mold clamping area, and can enable a linear part to be surrounded in an upper space of a rotary table. A mold clamping device (100) of an injection molding machine (10) is provided with: an upper platen (110); a rotary table (114) on which the plurality of lower dies (820) are mounted; a linear member (170), one end of which is fixed to the rotating table; and a safety protection device (128) for restricting intrusion from the molded article removal region (A2) to the mold clamping region (A1), one end of the linear member (170) being fixed to the rotary table and surrounding from this position to the upper side, the safety protection device comprising: a movable protection device (130) that rotates together with the rotary table; and a fixed guard device (140) fixed to the frame (900), the fixed guard device being disposed at a position offset toward the mold clamping region side or the molded article removal region side with respect to a rotation center (140c) of the rotary table.

Description

Technical Field

[0001] This application claims priority based on Japanese Patent Application No. 2024-001473 filed on January 9, 2024. The entire contents of the Japanese application are incorporated herein by reference.

[0002] The present invention relates to an injection molding machine. Background Art

[0003] Patent Document 1 discloses an injection molding machine in which a plurality of mold devices are mounted on a turntable, and by the intermittent rotation of the turntable, the plurality of mold devices are respectively arranged in a mold clamping area and a molded product taking-out area in sequence. According to this injection molding machine, it is possible to simultaneously perform mold clamping of the mold device in the mold clamping area and injection of the molding material into the mold device, and taking out of the molded product in the molded product taking-out area, and the molding cycle can be shortened.

[0004] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2023-124941

[0005] In the injection molding machine described in Patent Document 1, in order to take out a molded product etc. during mold clamping while ensuring safety, a safety protection device is provided to restrict intrusion from the molded product taking-out area where the molded product is taken out etc. into the mold clamping area where mold clamping is performed. However, in the case where the safety protection device is provided, if linear components such as wiring and piping fixed at one end to the turntable surround the upper space of the turntable, the linear components interfere with the safety protection device every time the turntable makes an intermittent rotation. On the other hand, if the linear components surround the lower space of the turntable, it is difficult to arrange complex devices in the lower part of the turntable. Summary of the Invention

[0006] The present invention has been completed in view of such a situation, and one exemplary object of one aspect thereof is to provide an injection molding machine that has a safety protection device for restricting intrusion from the molded product taking-out area into the mold clamping area and can route linear components around the upper space of the turntable.

[0007] In order to solve the above problems, an injection molding machine according to an embodiment of the present invention is an injection molding machine equipped with a mold clamping device. The mold clamping device includes: an upper platen for mounting an upper mold; a turntable for mounting a plurality of lower molds; a lower platen for rotatably supporting the turntable from below; a linear member having one end fixed to the turntable; and a safety protection device for restricting intrusion from the molded product take-out area into the mold clamping area. The linear member is fixed at one end to the turntable and loops around to the upper side therefrom. The safety protection device includes: a movable protection device mounted on the upper surface of the turntable and rotating together with the turntable; and a fixed protection device provided above the movable protection device and fixed to the frame. The fixed protection device is arranged at a position offset toward the mold clamping area side or the molded product take-out area side with respect to the rotation center of the turntable.

[0008] In addition, any combination of the above components, and the components and expressions of the present invention, when mutually replaced between methods, devices, systems, etc., are also effective as embodiments of the present invention.

[0009] Effects of the Invention

[0010] According to the present invention, it is possible to provide an injection molding machine having a safety protection device for restricting intrusion from the molded product take-out area into the mold clamping area, and capable of looping a linear member around the upper space of the turntable. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a perspective view of the injection molding machine according to the embodiment.

[0012] Figure 2 is a view showing Figure 1 a perspective view of the mold clamping device of the injection molding machine and its surroundings.

[0013] Figure 3 is Figure 1 a perspective view of the injection molding machine.

[0014] Figure 4 is Figure 1 a top view of the injection molding machine.

[0015] Figure 5 is a view showing Figure 1 a flowchart of the molding operation of the injection molding machine.

[0016] Description of Reference Numerals:

[0017] 10 - injection molding machine, 100 - mold clamping device, 110 - upper platen, 114 - turntable, 120 - lower platen, 128 - safety protection device, 130 - movable protection device, 140 - fixed protection device, 170 - linear member, A1 - mold clamping area, A2 - molded product take-out area. Detailed Implementation Manner

[0018] Hereinafter, the same or equivalent constituent elements, components, and processes shown in each drawing are labeled with the same reference numerals, and repeated descriptions are appropriately omitted. Also, for ease of understanding, the sizes of the components in each drawing are shown enlarged or reduced as appropriate. Further, in each drawing, a part of the components that are not important in terms of explaining the embodiment is omitted from display.

[0019] Reference Figures 1 to 4 . In Figure 2 , Figure 3 , the display of the four panels 101 to 104 is omitted. Also, in Figures 1 to 3 , the display of the upper mold 810 and the lower mold 820 is omitted. Also, in Figure 4 , the display of the injection device 200 is omitted.

[0020] Figure 1 , 2 , 4 indicates the state where the rotation stop position of the turntable 114 is the first rotation stop position, Figure 3 indicates the state where the rotation stop position of the turntable 114 is the second rotation stop position. The first rotation stop position is the rotation stop position where the first mounting portion 115_1 is at the mold clamping position P1 and the second mounting portion 115_2 is at the molded product take-out position P2. In other words, the first rotation stop position is the position where the lower mold 820 mounted on the first mounting portion 115_1 faces the upper mold 810. The second rotation stop position is the rotation stop position rotated 180° from the first rotation stop position, and is the rotation stop position where the second mounting portion 115_2 is at the mold clamping position P1 and the first mounting portion 115_1 is at the molded product take-out position P2. In other words, the second rotation stop position is the position where the lower mold 820 mounted on the second mounting portion 115_2 faces the upper mold 810.

[0021] Hereinafter, an explanation will be given based on the XYZ rectangular coordinate system. For convenience, the X-axis direction corresponds to the horizontal front-rear direction, the Y-axis direction corresponds to the horizontal left-right direction, and the Z-axis direction corresponds to the vertical up-down direction. In the X-axis direction, the side indicated by the arrow is referred to as the front side or the near-front side, and the opposite side is referred to as the rear side or the inner side. In the Y-axis direction, the side indicated by the arrow is referred to as the right side, and the opposite side is referred to as the left side. In the Z-axis direction, the side indicated by the arrow is referred to as the upper side, and the opposite side is referred to as the lower side. The X-axis direction is consistent with the direction opposite to the mold clamping area A1 and the molded product take-out area A2. Also, the X-axis direction is consistent with the direction opposite to the mounting portion 115 and further the lower mold 820 located in the molded product take-out area A2 and the mounting portion 115 and further the lower mold 820 located in the mold clamping area A1.

[0022] The injection molding machine 10 includes a mold clamping device 100, an injection device 200, an ejection device 300, and a frame 900.

[0023] The mold clamping device 100 performs mold closing, clamping, and mold opening of the mold device 800. The mold clamping device 100 has a vertical mold clamping direction and includes: an upper platen 110; a rotating table 114 provided below the upper platen 110 and spaced apart from the upper platen 110; a lower platen 120 that rotatably supports the rotating table 114 from below; four panels 101 to 104 that surround the upper platen 110, the rotating table 114, and the lower platen 120; a safety protection device 128 provided in the area surrounded by the four panels 101 to 104; an intrusion detection unit 160 that detects the intrusion of an object into the corresponding area; and a linear member 170 with one end fixed to the rotating table 114. Additionally, the mold clamping device 100 may be a horizontal type with a horizontal mold clamping direction.

[0024] The upper platen 110 is driven by a drive unit (not shown) and moves up and down relative to the rotating table 114 and further relative to the frame 900. An upper mold 810 is mounted on the opposing surface (lower surface) of the upper platen 110 that faces the rotating table 114.

[0025] The lower platen 120 is fixed to the frame 900. The rotating table 114 is rotatably supported on the opposing surface (upper surface) 120a of the lower platen 120 that faces the upper platen 110 in the vertical direction.

[0026] The rotating table 114 has a first mounting portion 115_1 and a second mounting portion 115_2 (collectively referred to as "mounting portion 115" when not specifically distinguished) on its upper surface 114a. The two mounting portions 115 are provided on opposite sides of 180° with respect to the rotation center 140c of the rotating table 114. Lower molds 820 are respectively mounted on the first mounting portion 115_1 and the second mounting portion 115_2. The mold device 800 is composed of the upper mold 810 and the lower mold 820.

[0027] A rotation motor (not shown) intermittently rotates the rotating table 114 180° alternately in the clockwise and counterclockwise directions, whereby the two lower molds 820 are alternately moved to the mold clamping position P1 and the molded product ejection position P2. When one of the two lower molds 820 is located at the mold clamping position P1, the other lower mold 820 is located at the molded product ejection position P2.

[0028] The mold clamping position P1 is the position where the mold device 800 is clamped. The molded product ejection position P2 is the position where the molded product is ejected from the lower mold 820.

[0029] The mold closing, clamping, and mold opening of the mold device 800 are performed by moving the upper platen 110 up and down relative to the rotating table 114.

[0030] The front surface panel 101, the rear surface panel 102, the left side panel 103, and the right side panel 104 are fixed to the frame 900. The side panels 103, 104 are respectively provided with doors 103a, 104a. The user can open the doors 103a, 104a to perform maintenance on the die device 800. When the doors 103a, 104a are opened, the lowering of the upper platen 110 is mechanically locked.

[0031] An opening 101a is provided on the front surface panel 101. The user can access the lower die 820 located at the molded product take-out position P2 from the opening 101a, and set an insert in the lower die 820, or take out the molded product from the lower die 820.

[0032] The opening 101a is not provided with a door and is always open. This is because it is cumbersome to open and close the opening 101a every time an insert is set in the lower die 820 or the molded product is taken out from the lower die 820, and it will cause the molding cycle to become longer.

[0033] The safety protection device 128 divides the area surrounded by the four panels 101 to 104 into a mold clamping area A1 having a mold clamping position P1 and a molded product take-out area A2 having a molded product take-out position P2. The safety protection device 128 restricts an object such as the hand of an operator who intrudes into the molded product take-out area A2 from the opening 101a from further intruding into the mold clamping area A1 from the molded product take-out area A2.

[0034] The intrusion detection unit 160 detects the intrusion of an object such as the hand of an operator into the molded product take-out area A2. In the illustrated example, the intrusion detection unit 160 is a light curtain, including a light projecting unit 161 and a light receiving unit 162. When at least a part of the plurality of parallel light rays emitted from the light projecting unit 161 does not reach the light receiving unit 162, the intrusion detection unit 160 detects that there is an object blocking the light rays between the light projecting unit 161 and the light receiving unit 162, that is, an object has intruded into the molded product take-out area A2.

[0035] As described above, since the opening 101a is always open, even when the mold clamping device 100 performs a dangerous action for the operator, the operator can intrude into the molded product take-out area A2. Therefore, when the intrusion detection unit 160 detects the intrusion of an object, the mold clamping device 100 does not perform a dangerous action. Specifically, when the intrusion detection unit 160 detects the intrusion of an object during the execution of a dangerous action by the mold clamping device 100, the mold clamping device 100 stops the dangerous action. And even when the execution timing of the dangerous action arrives, during the period when the intrusion detection unit 160 detects the intrusion of an object, the mold clamping device 100 does not start the dangerous action.

[0036] On the other hand, even when the intrusion detection unit 160 detects the intrusion of an object, if it is not a dangerous operation for the operator, the mold clamping device 100 also performs the operation. Specifically, during the process of the mold clamping device 100 performing a non-dangerous operation, when the intrusion detection unit 160 detects the intrusion of an object, the control device 700 causes the mold clamping device 100 not to stop its operation but to continue performing. Moreover, when the execution timing of the non-dangerous operation arrives, even during the period when the intrusion detection unit 160 detects the intrusion of an object, the mold clamping device 100 starts the operation.

[0037] For example, a dangerous operation is the rotation of the rotary table 114. This is because if a hand or the like is inserted into the molded product take-out area A2 during the rotation of the rotary table 114, it may be pinched between a component that rotates with the rotary table 114 and a component that does not rotate with the rotary table 114. Therefore, when the intrusion detection unit 160 detects the intrusion of an object during the rotation of the rotary table 114, the mold clamping device 100 stops the rotation of the rotary table 114. Moreover, even when the timing to rotate the rotary table 114 arrives, the mold clamping device 100 does not start the rotation of the rotary table 114 during the period when the intrusion detection unit 160 detects the intrusion of an object.

[0038] Moreover, for example, a dangerous operation is the lowering of the rod of the ejector device 300 that protrudes into the cavity space of the lower mold 820, which will be described later. This is because if a hand or the like is inserted into the molded product take-out area A2 during the lowering of the rod, it may be pinched between the ejector plate that descends with the rod and the lower mold 820. Therefore, when the intrusion detection unit 160 detects the intrusion of an object during the lowering of the rod, the mold clamping device 100 stops the lowering of the rod. Moreover, even when the timing to lower the rod arrives, the mold clamping device 100 does not start the lowering of the rod during the period when the intrusion detection unit 160 detects the intrusion of an object.

[0039] In addition, the intrusion from the molded product take-out area A2 to the mold clamping area A1 is restricted by the safety guard device 128. Therefore, the operations of the mold clamping device 100 performed in the mold clamping area A1, such as mold clamping, closing the mold, and opening the mold, are not dangerous operations in the present embodiment.

[0040] The linear member 170 is wiring and piping. The number of the linear members 170 is not particularly limited. One end of the linear member 170 is connected (i.e., fixed) to the connector 164, and the connector 164 is fixed to the upper surface 114a of the rotary table 114 on the near side of the safety guard device 128. That is, one end of the linear member 170 is fixed to the rotary table 114 via the connector 164 on the near side of the safety guard device 128. Therefore, the one end side of the linear member 170 rotates with the rotary table 114. Specifically, the one end side of the linear member 170 is on the left inside of the molded product take-out area A2 (refer to Figure 2) and the right inner side of the molded product take-out area A2 (see Figure 3 ) and reciprocates between them. The other end side of the linear member 170 is fixed to a non-movable member in the molded product take-out area A2. The non-movable member is a member that does not rotate together with the rotary table 114 and does not move up and down together with the upper platen 110.

[0041] The wiring is, for example, a strong wire for supplying power to the heater of the heating lower mold 820 and a weak wire for transmitting the electrical signal of the thermocouple that measures the temperature of the lower mold 820.

[0042] The piping is, for example, a supply pipe for supplying a heat medium (refrigerant or heat medium) such as water that adjusts the temperature of the lower mold 820 to the inside of the lower mold 820 and a discharge pipe for discharging the heat medium from the inside of the lower mold 820 to the outside.

[0043] In addition, in Figures 1 to 4 the display of the linear member between the connector 164 and the lower mold 820 is omitted.

[0044] The injection device 200 is a vertical type with the axial direction of the cylinder (not shown) being vertical and is arranged above the upper platen 110. In addition, the injection device 200 can also be a horizontal type with the axial direction of the cylinder being horizontal. And the mold clamping device 100 combined with the vertical injection device 200 can be vertical or horizontal. Similarly, the mold clamping device 100 combined with the horizontal injection device 200 can be horizontal or vertical.

[0045] The injection device 200 has a cylinder (not shown) with a nozzle provided at the front end. The injection device 200 is driven by a drive unit (not shown) and moves up and down relative to the upper platen 110 and further relative to the mold device 800 arranged at the mold clamping position P1. The injection device 200 descends to bring the nozzle into contact with the mold device 800 arranged at the mold clamping position P1 and injects the molding material into the cavity space of the mold device 800. The molded product is obtained by curing the molding material filled in the cavity space. The number of cavity spaces is, for example, multiple, and multiple molded products are obtained simultaneously. The number of cavity spaces can be one.

[0046] The ejector device 300 peels the molded product from the lower mold 820 arranged at the molded product take-out position P2. The ejector device 300 is not particularly limited, but in this embodiment, the rod is raised to make the rod protrude into the cavity space of the lower mold 820, thereby peeling the molded product from the lower mold 820.

[0047] The above is the basic structure of the injection molding machine 10. Next, its operation will be described.

[0048] See Figure 5 . Figure 5The processing is repeatedly executed. The mold clamping device 100 rotates the rotary table 114 (S101). In addition, the mold clamping device 100 rotates the rotary table 114 in the direction opposite to that of the previous processing. That is, when it was rotated in the clockwise direction in the previous processing, it is rotated in the counterclockwise direction in the current processing. And when it was rotated in the counterclockwise direction in the previous processing, it is rotated in the clockwise direction in the current processing. Specifically, when the rotation stop position of the rotary table 114 is the first rotation stop position ( Figure 1 , 2 and the rotation stop position of 4), the rotary table 114 is rotated 180° in the counterclockwise direction. When the rotation stop position of the rotary table 114 is the second rotation stop position ( Figure 3 rotation stop position), the rotary table 114 is rotated 180° in the clockwise direction. By rotating the rotary table 180°, the lower mold 820 on which the molded product is placed at the mold clamping position P1 and the lower mold 820 at the molded product take-out position P2 are interchanged.

[0049] The mold clamping device 100 sequentially performs mold closing (S102), mold clamping (S103), filling of the molding material (S104), and mold opening (S105).

[0050] The ejector device 300 projects the rod into the cavity space of the lower mold 820 (S201). Thereby, the molded product is peeled off from the lower mold 820. The operator takes out the molded product from the lower mold 820 (S301). The ejector device 300 lowers the rod, that is, returns it (S202). The operator sets the insert into the lower mold 820 (S302).

[0051] If an object is detected to invade the molded product take-out area A2 during the rotation of the rotary table in S101, the rotation of the rotary table in S101 stops. And during the period when an object is detected to invade the molded product take-out area A2, the rotation of the rotary table in S101 does not start.

[0052] If an object is detected to invade the molded product take-out area A2 during the return of the rod in S202, the return of the rod in S202 stops. And during the period when an object is detected to invade the molded product take-out area A2, the return of the rod in S202 does not start. In addition, even when the return of the rod is stopped, etc., the mold closing in S102, the mold clamping in S103, the filling of the molding material in S104, and the mold opening in S105 in the mold clamping area A1 are executed.

[0053] Next, the safety protection device 128 will be described in more detail.

[0054] Refer to Figures 1 to 4。The safety protection device 128 includes two movable protection devices 130, two fixed protection devices 140, and a central protection device 150. The two fixed protection devices 140 and the central protection device 150 are held by a holding frame 129. The holding frame 129 is fixed to the side panels 103, 104. Accordingly, the two fixed protection devices 140 and the central protection device 150 are fixed to the side panels 103, 104 via the holding frame 129 and thus fixed to the frame 900. The protection devices 130, 140, 150 are not particularly limited and may be formed to be transparent or translucent. At this time, the state of the mold clamping area A1 can be visually recognized.

[0055] The central protection device 150 is a plate-shaped member that is V-shaped in a top view. The central protection device 150 is configured such that the vertex of the V-shape is located in the front side near the rotation center 140c of the turntable 114, and both ends of the V-shape are located at positions more rearward than the rotation center 140c of the turntable 114. The central protection device 150 is configured to avoid the upper platen 110.

[0056] The two fixed protection devices 140 are plate-shaped members that extend from both ends of the central protection device 150, respectively. The fixed protection device 140 is arranged such that the main surface faces the X-axis direction. Accordingly, in a top view, the fixed protection device 140 extends in the Y-axis direction.

[0057] The two fixed protection devices 140 are arranged at positions more rearward than the rotation center 140c of the turntable 114. In other words, the two fixed protection devices 140 are arranged at positions shifted rearward, i.e., toward the mold clamping area A1 side, with respect to the rotation center 140c of the turntable 114.

[0058] More specifically, the two fixed protection devices 140 are arranged in a top view at positions more inward than a straight line L that passes through the rotation center 140c of the turntable 114 and extends in the Y-axis direction. In other words, the two fixed protection devices 140 are arranged at positions shifted rearward, i.e., toward the mold clamping area A1 side, from the straight line L.

[0059] In addition, the two fixed protection devices 140 are of course arranged at positions that do not interfere with the lifting of the upper platen 110.

[0060] The fixed protection device 140 is provided above the movable protection device 130. The fixed protection device 140 is formed such that when the turntable 114 rotates, the movable protection device 130, the lower mold 820, and the molded product can pass under the fixed protection device 140.

[0061] It can also be as Figure 2 、 3As in the example, the fixed protection device 140 includes an upper protection device 141 and a lower protection device 142. The lower protection device 142 is disposed between the upper protection device 141 and the movable protection device 130 in the vertical direction. The lower protection device 142 is fixed to a non-movable member. The non-movable member may be the upper protection device 141. That is, as in Figure 2 , 3 's example, the lower protection device 142 is fixed to the upper protection device 141.

[0062] The lower protection device 142 is detachably fixed. "Detachably fixed" means being fixed so that the operation of fixing the lower protection device 142 and the operation of releasing the fixing can be repeatedly performed. Alternatively, the lower protection device 142 is fixed to the upper protection device 141 by a hinge or the like. That is, the lower protection device 142 is foldably (retractably) fixed to the upper protection device 141. Alternatively, the lower protection device 142 is slidably fixed to the upper protection device 141 in the vertical direction.

[0063] Here, when the upper die 810 is mounted on the upper platen 110, the upper die 810 and the lower die 820 are disposed at the molded product take-out position P2 in the molded product take-out area A2 by a crane or the like, the turntable 114 is rotated to dispose them at the mold clamping position P1 in the mold clamping area A1, the upper platen 110 is lowered so that the upper platen 110 contacts the upper die 810, and the upper die 810 is fixed to the upper platen 110 by a fixing tool. The fixed protection device 140 is not formed so that the upper die 810 can pass under the fixed protection device 140. Therefore, when the turntable 114 is rotated with the fixed protection device 140 remaining as it is, the upper die 810 contacts the fixed protection device 140.

[0064] In contrast, by removing the lower protection device 142 or the like, contact between the upper die 810 and the fixed protection device 140 can be avoided.

[0065] At the lower end of the fixed protection device 140, in the example shown in the figure, at the lower end of the lower protection device 142, a notch 140a is formed for allowing the gate attached to the molded product to pass through.

[0066] Here, if the distance D in the vertical direction from the rotary table 114 to the fixed protection device 140 is short, when the mold thickness of the mold device 800 is thick, the lower mold 820 on which the molded product with a gate is placed cannot pass under the fixed protection device 140. That is, the mold device 800 with a thick mold thickness cannot be used. Moreover, if the distance D is long, in other words, if the height of the movable protection device 130 is high, even when using a mold device 800 with a thin mold thickness, when the mold is opened, the upper platen 110 needs to be raised relatively high corresponding to the height of the movable protection device 130 so that the movable protection device 130 can pass under the upper platen 110 and the upper mold 810. This will prevent shortening of the molding cycle.

[0067] In contrast, since the fixed protection device 140 has a notch 140a for the gate to pass through, compared with the case where the notch 140a is not formed, even if the distance D is the same, a mold device 800 with a thicker mold thickness can be used. Or, when the mold thickness of the mold device 800 that can be used remains the same, the distance D can be shortened.

[0068] The two movable protection devices 130 are arranged so as to sandwich the rotation center 140c of the rotary table 114. The two movable protection devices 130 are fixed to a connector 164, and the connector 164 is fixed to the upper surface 114a of the rotary table 114. That is, the two movable protection devices 130 are fixed to the rotary table 114 via the connector 164. Therefore, the two movable protection devices 130 rotate together with the rotary table 114.

[0069] Each of the two movable protection devices 130 includes: a first movable protection device 131 that, when the rotary table 114 stops rotating at the first rotation stop position ( Figure 1 , 2 and the rotation stop position 4), cooperates with the fixed protection device 140 to restrict the intrusion of an object; and a second movable protection device 132 that, when the rotary table 114 stops rotating at the second rotation stop position ( Figure 3 rotation stop position), cooperates with the fixed protection device 140 to restrict the intrusion of an object.

[0070] The first movable protection device 131 has a main body portion 131a. When the rotary table 114 stops rotating at the first rotation stop position, the main surface of the main body portion 131a faces the X-axis direction, that is, extends in the Y-axis direction in a plan view.

[0071] The second movable protection device 132 has a main body portion 132a. When the rotary table 114 stops rotating at the second rotation stop position, the main surface of the main body portion 132a faces the X-axis direction, that is, extends in the Y-axis direction in a plan view.

[0072] Preferably, when the rotation stop position of the rotary table 114 is the first rotation stop position, the first movable protection device 131 overlaps with the fixed protection device 140 in a top view, and when the rotation stop position of the rotary table 114 is the second rotation stop position, the second movable protection device 132 overlaps with the fixed protection device 140 in a top view.

[0073] In any case, when the rotation stop position of the rotary table 114 is the first rotation stop position and the second rotation stop position, the gap between the movable protection device 130 and the fixed protection device 140 only needs to be such that a worker's finger cannot reach a dangerous part (for example, directly below the upper pressing plate 110) from this gap. For example, the size of the gap and the distance from the gap to the upper pressing plate 110 only need to meet the specified safety standards.

[0074] When the rotation stop position of the rotary table 114 is the first rotation stop position or the second rotation stop position, one end of the linear member 170, that is, the end fixed to the rotary table 114, is located at a position offset inward or forward with respect to the straight line L by an offset Q2 smaller than the offset Q1 of the fixed protection device 140. In addition, when the offset Q2 is smaller than the offset Q1, the case where the offset Q2 is 0 is also included. That is, the case where one end of the linear member 170 is located on the straight line L is also included.

[0075] And the linear member 170 is connected to the connector 164 between the first movable protection device 131 and the second movable protection device 132. In the illustrated example, there are a plurality of linear members 170, and the plurality of linear members 170 are connected to the connector 164 on one of the two movable protection devices 130. That is, the plurality of linear members 170 are fixed to the rotary table 114 on the same side with respect to the rotation center 140c of the rotary table 114.

[0076] The linear member 170 surrounds upward from the connecting portion connected to the connector 164. That is, the linear member 170 does not surround downward the lower side of the lower pressing plate 120. Thereby, a complex device can be arranged below the lower pressing plate 120.

[0077] According to the present embodiment described above, since the fixed protection device 140 is arranged at a position offset with respect to the rotation center 140c of the rotary table 114, when the rotary table 114 is intermittently rotated alternately in the clockwise direction and the counterclockwise direction between the first rotation stop position and the second rotation stop position, that is, when the rotary table 114 is intermittently rotated 180° alternately in the clockwise direction and the counterclockwise direction, interference between the linear member 170 and the fixed protection device 140 can be avoided.

[0078] Moreover, according to the present embodiment, when the rotation stop position of the turntable 114 is the first rotation stop position or the second rotation stop position, one end of the linear member 170 is located at a position offset inward or forward with respect to the straight line L by an offset smaller than that of the fixed protection device 140. At this time, interference between the linear member 170 and the fixed protection device 140 can be more reliably avoided.

[0079] Moreover, according to the present embodiment, when there are a plurality of linear members 170, the plurality of linear members 170 are fixed to the turntable 114 on the same side with respect to the rotation center 140c of the turntable 114. Thereby, even when there are a plurality of linear members 170, interference with the fixed protection device 140 can be avoided.

[0080] The present invention has been described based on the embodiments. Those skilled in the art can understand that these embodiments are illustrative, and various modifications can be achieved by combining these respective constituent elements and respective processing steps, and such modifications are also included within the scope of the present invention. Hereinafter, the modifications will be described.

[0081] (Modification 1)

[0082] In the embodiment, the case where the movable protection device 130 includes the first movable protection device 131 and the second movable protection device 132 has been described, but the movable protection device 130 may also be formed as a single thick block along the X direction. That is, the single movable protection device 130 can function as both the first movable protection device 131 and the second movable protection device 132. At this time, the movable protection device 130 is preferably formed to overlap the fixed protection device 140 in a plan view when the rotation stop position of the turntable 114 is the first rotation stop position and the second rotation stop position. To achieve this, the thickness of the movable protection device 130 in the X direction can be twice or more the offset Q1 of the fixed protection device 140.

[0083] (Modification 2)

[0084] The two fixed protection devices 140 can be arranged at a position more forward than the rotation center 140c of the turntable 114. In other words, the two fixed protection devices 140 can be arranged at a position offset forward with respect to the rotation center 140c of the turntable 114, that is, on the side of the molded product take-out area A2. More specifically, the two fixed protection devices 140 can be arranged at a position closer to the front side in a plan view than the straight line L passing through the rotation center 140c of the turntable 114 and extending in the Y-axis direction. In other words, the two fixed protection devices 140 can be arranged at a position offset forward from this straight line L, that is, on the side of the molded product take-out area A2. At this time, it is only necessary to surround the linear member 170 in such a way that it is not clamped between the upper mold 810 and the lower mold 820 or the like.

[0085] Any combination of the above-described embodiments and modification examples also functions as an embodiment of the present invention. The new embodiment produced by the combination has the effects of the combined embodiments and modification examples respectively. And those skilled in the art can understand that the functions to be performed by the respective constituent elements described in the technical solution are achieved by the individual constituent elements shown in the embodiments and modification examples or their cooperation.

Claims

1. An injection molding machine, which is provided with a mold clamping device, wherein, the mold clamping device includes: an upper platen for mounting an upper mold; a rotating table for mounting a plurality of lower molds; a lower platen for rotatably supporting the rotating table from below; a linear member having one end fixed to the rotating table; and a safety protection device for restricting intrusion from the molded product taking-out area into the mold clamping area, the linear member is such that one end is fixed to the rotating table and is wound around to the upper side therefrom, the safety protection device includes: a movable protection device mounted on the upper surface of the rotating table and rotating together with the rotating table; and a fixed protection device provided above the movable protection device and fixed to a frame, the fixed protection device is arranged at a position offset toward the mold clamping area side or the molded product taking-out area side with respect to the rotation center of the rotating table.

2. The injection molding machine according to claim 1, wherein, when the rotating table stops at the rotation stop position where the lower mold faces the upper mold, the one end of the linear member fixed to the rotating table is located at a position offset inward or forward with respect to the rotation center with an offset amount smaller than that of the fixed protection device.

3. The injection molding machine according to claim 1, wherein, a plurality of the linear members are provided, the plurality of linear members are fixed to the rotating table on the same side with respect to the rotation center.

4. The injection molding machine according to claim 1, wherein, when the rotating table stops at the rotation stop position where the lower mold faces the upper mold, the fixed protection device overlaps the movable protection device in a top view.

5. The injection molding machine according to claim 1, wherein, the plurality of lower molds are two lower molds, the injection molding machine includes: a first movable protection device that overlaps the fixed protection device in a top view when the rotating table stops at the rotation stop position where one of the two lower molds faces the upper mold; and a second movable protection device that overlaps the fixed protection device in a top view when the rotating table stops at the rotation stop position where the other of the two lower molds faces the upper mold.

6. The injection molding machine according to claim 5, wherein, the linear member is fixed to the rotating table between the first movable protection device and the second movable protection device.

7. The injection molding machine according to claim 1, wherein, the fixed protection device includes an upper protection device and a lower protection device provided between the upper protection device and the movable protection device, the lower protection device is fixed in a detachable manner, foldable with respect to the upper protection device, or slidable with respect to the upper protection device.

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