JP2022026275A - Injection molding machine - Google Patents

Abstract

To provide an injection molding machine capable of further reliably detecting a belt breakage.SOLUTION: There is provided an injection molding machine having an injection device driving mechanism 23, in which a driving side timing belt 115 is hung on a driving pulley 110 and an intermediate pulley 114. A roller 122 is disposed so as to be in contact with a portion between the driving pulley 110 and the intermediate pulley 114 on an outer peripheral surface of the driving side timing belt 115. A support arm 121 rotatably supports the rollers, and a force to swing the roller 122 is applied into a direction in which the roller is pressed (pressing direction D1) to the driving side timing belt 115 by a spring member 123. An operation unit 130b is in contact with the support arm 121 so as to switch a limit switch 130 in between a closed state and an open state when the support arm 121 is swung in the pressing direction D1.SELECTED DRAWING: Figure 7

Description

The present invention relates to an injection molding machine having a drive mechanism for driving a movable body.

An example of a conventional injection molding machine is disclosed in Patent Document 1. The injection molding machine of Patent Document 1 has a limit switch arranged in the vicinity of the belt of the vertical tightening mechanism portion. In the limit switch, a rolling roller attached to the tip of the operation unit is pressed against the belt. When the belt breaks, the operation unit is displaced, the limit switch switches from the closed state to the open state, and the break of the belt is detected.

Japanese Unexamined Patent Publication No. 7-88922

In the injection molding machine described above, a belt is arranged between the rolling roller and the pulley. Therefore, if the broken belt is wrapped around the pulley, there is a possibility that the broken belt cannot be detected.

Therefore, an object of the present invention is to provide an injection molding machine capable of more reliably detecting a breakage of a belt.

In order to achieve the above object, the injection molding machine according to the present invention is an injection molding machine having a drive mechanism for driving a movable body, and the drive mechanism is a drive pulley attached to a rotating shaft of an electric motor. , A plurality of driven pulleys, an intermediate pulley coaxially fixed to the driven pulley of one of the plurality of driven pulleys, a drive side timing belt mounted on the drive pulley and the intermediate pulley, and the plurality of driven pulleys. A driven side timing belt mounted on the driven pulley, a roller arranged so as to be in contact with a portion between the drive pulley and the intermediate pulley on the outer peripheral surface of the drive side timing belt, and a roller rotatably supported. A support arm that can swing in the direction in which the roller is pressed against the drive-side timing belt (hereinafter referred to as "pressing direction") and a spring that applies a force to swing the support arm in the pressing direction. It is characterized by having a member and a limit switch arranged so as to switch between a closed state and an open state when the support arm is swung in the pressing direction.

According to the present invention, when the drive side timing belt breaks, the tension is loosened and the support arm swings in the pressing direction. Therefore, even if the belt is wound around the pulley, the support arm always swings, and the closed state and the open state of the limit switch are surely switched. Therefore, the breakage of the belt can be detected more reliably.

It is a front view of the injection molding machine which concerns on 1st Embodiment of this invention. It is a top view of the mold clamping device of the injection molding machine of FIG. 1 and its vicinity. It is a figure explaining the functional block of the injection molding machine of FIG. It is sectional drawing of the mold clamping device of the injection molding machine of FIG. 1 and the vicinity thereof. It is a perspective view of the injection device drive mechanism which the injection molding machine of FIG. 1 has. It is another perspective view of the injection device drive mechanism of FIG. It is a top view of the injection device drive mechanism of FIG. It is a perspective view of the injection device drive mechanism of FIG. 5 (belt break state). It is a top view of the injection device drive mechanism of FIG. 5 (belt break state). It is a perspective view of the injection device drive mechanism which the injection molding machine which concerns on 2nd Embodiment of this invention has. It is another perspective view of the injection device drive mechanism of FIG. It is a side view of the injection device drive mechanism of FIG. It is an enlarged perspective view of the main part of the injection device drive mechanism of FIG. It is another perspective view which enlarged the main part of the injection device drive mechanism of FIG. It is a top view of the injection device drive mechanism of FIG. It is an enlarged perspective view of the main part of the injection device drive mechanism of FIG. 10 (belt broken state). It is an enlarged plan view of the main part of the injection device drive mechanism of FIG. 10 (belt break state).

(First Example)
Hereinafter, the injection molding machine according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 9.

As shown in each figure, the injection molding machine 1 includes a mold clamping device 10, an injection device 20, a molded product take-out device 40, a display input device 60, and a control device 70. These devices are installed on the base 5.

The mold clamping device 10 includes a rotary table 11, a movable die plate 12, a rotary drive mechanism 13, and a mold clamping drive mechanism 14. A plurality of molds 80 are installed on the rotary table 11. The rotation drive mechanism 13 intermittently rotates the rotary table 11 in a clockwise direction by a predetermined angle (90 degrees in this embodiment).

The plurality of molds 80 are installed on the upper surface 11a of the rotary table 11 at equal angle intervals. In this embodiment, four molds 80 are installed on the upper surface 11a. These molds 80 are moved by the rotary table 11 in a closed state (a state in which the upper mold 81 and the lower mold 82 are overlapped). The plurality of molds 80 are positioned at the injection station P1, the first cooling station P2, the second cooling station P3, and the molded product take-out station P4.

The injection station P1 is an injection position for molding and filling the plasticized resin by molding the mold 80. The first cooling station P2 and the second cooling station P3 are cooling positions for cooling the resin injected into the mold 80, and are at the 3 o'clock and 6 o'clock positions when the injection station P1 is set to the 0 o'clock position. be. The molded product take-out station P4 is a molded product take-out position for opening the mold 80 and taking out the molded product, and is at the 9 o'clock position when the injection station is set to the 0 o'clock position. In the injection molding machine 1, both or one of the first cooling station P2 and the second cooling station P3 may be omitted, and two or three molds 80 may be installed on the upper surface 11a of the rotary table 11. ..

The mold clamping drive mechanism 14 moves the movable die plate 12 in the vertical direction so as to sandwich the mold 80 between the rotary table 11 and the movable die plate 12. Then, the mold clamping drive mechanism 14 vertically tightens the upper mold 81 and the lower mold 82 of the mold 80 to generate a mold clamping force. The mold clamping drive mechanism 14 includes an electric motor provided with an electromagnetic brake and an encoder for position detection, a ball screw mechanism that converts the rotational operation of the electric motor into a linear operation, and a toggle link mechanism for generating a mold clamping force. And have.

The injection device 20 is arranged above the movable die plate 12. The injection device 20 is movable in the vertical direction. The injection device 20 includes a heating cylinder 21 and a screw 22. The heating cylinder 21 is provided with a nozzle 21a facing downward at the tip thereof. The screw 22 is housed in the heating cylinder 21 so as to be rotatable and forward / backward. The forward / backward movement of the screw 22 is a movement in the vertical direction. The screw 22 has a stopper portion that abuts on the lower limit stopper and the upper limit stopper at the predetermined forward limit position J1 and the predetermined backward limit position J2. The injection device 20 regulates that the screw 22 moves downward from the forward limit position J1 when the stopper portion of the screw 22 comes into contact with the lower limit stopper.

Further, the injection device 20 has an injection device drive mechanism 23 and a screw drive mechanism 24. The injection device drive mechanism 23 moves the injection device 20 as a movable body in the vertical direction. The injection device drive mechanism 23 has a nozzle touch position K1 in which the nozzle 21a of the heating cylinder 21 passes through the through hole 12a of the movable die plate 12 and touches the upper mold 81, and the nozzle touch position K1 above the nozzle touch position K1. Move to the nozzle back position K2. When the injection device 20 is moved to the nozzle touch position K1, the nozzle 21a is connected to the cavity 84 through the resin flow path 85 of the mold 80 having a runner, a spool, a gate, and the like. The details of the injection device drive mechanism 23 will be described later.

The screw drive mechanism 24 rotates and advances the screw 22 in the heating cylinder 21. The screw drive mechanism 24 includes an electric motor provided with an electromagnetic brake and an encoder for position detection, and a ball screw mechanism that converts the rotational operation of the electric motor into a linear operation.

The molded product take-out device 40 includes a mold opening / closing device 41, an ejector device 42, and a take-out machine 43. The mold opening / closing device 41 moves the upper mold 81 in the vertical direction with respect to the lower mold 82. The ejector device 42 moves, for example, an ejector pin (not shown) provided on the lower mold 82 in the vertical direction. When the ejector pin protrudes into the cavity 84 of the mold 80, the molded product is pushed out from the cavity 84. The take-out machine 43 moves the molded product extruded from the cavity 84 to a predetermined place.

The display input device 60 includes a display device 61 for displaying information related to the injection molding machine 1 and an input device 62 for inputting an operation. The display device 61 and the input device 62 are connected to the control device 70. The display device 61 displays various screens in the display area. The input device 62 includes an input key, and transmits a signal corresponding to each input key to the control device 70. Further, the display input device 60 includes a touch panel as the input device 62, and has a software switch configured by combining a touch panel superimposed on the display area of the display device 61 and an icon displayed in the display area.

The control device 70 is composed of a microcomputer and controls the operation of the entire injection molding machine 1. The control device 70 controls each drive mechanism such as the rotation drive mechanism 13, the mold clamping drive mechanism 14, the injection device drive mechanism 23, the screw drive mechanism 24, the mold opening / closing device 41, the ejector device 42, and the ejector 43. "Controlling a drive mechanism" includes controlling an actuator such as an electric motor or an air cylinder included in the drive mechanism.

Next, an example of the molding operation of the injection molding machine 1 will be described.

(1) The control device 70 controls the rotation drive mechanism 13 to intermittently rotate the rotary table 11 in the clockwise direction to rotate the plurality of molds 80 into the injection station P1, the first cooling station P2, and the second cooling station P3. And move to the molded product take-out station P4 in order.

(2) The control device 70 controls the mold clamping drive mechanism 14, moves the movable die plate 12 downward at the injection station P1, and sandwiches the mold 80 between the rotary table 11 and the movable die plate 12. , The upper mold 81 and the lower mold 82 are molded.

(3) The control device 70 controls the injection device drive mechanism 23, and moves the injection device 20 to the nozzle touch position K1 where the nozzle 21a touches the upper mold 81 at the injection station P1.

(4) The control device 70 controls the screw drive mechanism 24, advances the screw 22 at the injection station P1, and injects and fills the cavity 84 of the mold 80 with resin. The screw 22 is then rotated and retracted for plastic weighing for the next molding.

(5) The control device 70 controls the injection device drive mechanism 23 to move the injection device 20 to the nozzle back position K2 above the nozzle touch position K1.

(6) The control device 70 controls the mold clamping drive mechanism 14 and moves the movable die plate 12 upward to release the mold clamping of the upper mold 81 and the lower mold 82.

(7) The control device 70 controls the mold opening / closing device 41, the ejector device 42, and the ejecting machine 43, and takes out the molded article from the mold 80 at the molded article taking out station P4. After that, the above operations (1) to (7) are repeatedly executed.

Here, the injection device drive mechanism 23 will be described with reference to FIGS. 5 to 9. 5 to 7 show a normal state (not broken) of the drive side timing belt 115, and FIGS. 8 and 9 show a state in which the drive side timing belt 115 is broken. In FIGS. 5 to 9, the ball screw mechanism 102 is not shown.

The injection device drive mechanism 23 includes a drive mechanism main body 101, a ball screw mechanism 102, an electric motor 105, a drive pulley 110, driven pulleys 111, 112, 113, an intermediate pulley 114, and a drive side timing belt 115. It has a driven side timing belt 116, a support arm 121, a roller 122, a spring member 123, a limit switch 130, a stopper body 140, and a cylinder device 150.

A heating cylinder 21 is fixed to the drive mechanism main body 101. The ball screw mechanism 102 (FIG. 1) has a ball screw shaft and a nut body (not shown). The ball screw shaft is arranged along the vertical direction. The nut body is screwed to the ball screw shaft. The nut body is rotatably arranged inside the drive mechanism main body 101. A plurality of ball screw mechanisms 102 (three in this embodiment) are provided.

The electric motor 105 is fixed to the drive mechanism main body 101. A drive pulley 110 is attached to the rotating shaft 105a of the electric motor 105. The rotation shaft 105a is arranged along the vertical direction. The driven pulleys 111, 112, and 113 are coaxially fixed to the nut bodies of the plurality of ball screw mechanisms 102. The nut body rotates together with the driven pulleys 111, 112, 113. The intermediate pulley 114 is coaxially fixed to the driven pulley 111 (one driven pulley). The driven pulley 111 rotates together with the intermediate pulley 114. A ball screw shaft is inserted through the driven pulleys 111, 112, 113 and the intermediate pulley 114.

The drive side timing belt 115 is hung on the drive pulley 110 and the intermediate pulley 114. The driven side timing belt 116 is hung on the driven pulleys 111, 112, 113 and the tension pulley 117.

The support arm 121 is arranged at a position between the drive pulley 110 and the intermediate pulley 114. The support arm 121 extends linearly so as to intersect the drive side timing belt 115.

A roller 122 is arranged at one end 121a of the support arm 121. The roller 122 is rotatably supported by the support arm 121. The roller 122 is in contact with a portion on the outer peripheral surface of the drive-side timing belt 115 between the drive pulley 110 and the intermediate pulley 114.

The other end 121b of the support arm 121 is provided with a swing shaft 121c of the support arm 121. The swing shaft 121c is arranged so as to be parallel to the rotation shaft 105a of the electric motor 105. The support arm 121 can swing around the swing shaft 121c.

The spring member 123 is a coil spring. One end of the spring member 123 is attached to one end 121a of the support arm 121, and the other end is attached to the drive mechanism main body 101. The spring member 123 applies a force to the support arm 121 to swing in the direction in which the roller 122 is pressed against the drive side timing belt 115 (hereinafter, referred to as “pressing direction D1”). The pressing direction D1 is clockwise in FIG. 7.

The limit switch 130 is a position detection switch having a switch body 130a in which a microswitch is enclosed and an operation unit 130b connected to the microswitch. The limit switch 130 is arranged so that the operation unit 130b is in contact with the contact piece 121d provided at one end 121a of the support arm 121 when the drive side timing belt 115 is in a normal state (not broken). ing. When the drive side timing belt 115 breaks and the support arm 121 swings in the pressing direction D1, the limit switch 130 separates the contact piece 121d from the operation portion 130b and switches between the closed state and the open state. The limit switch 130 is connected to the control device 70.

The stopper body 140 has a rectangular parallelepiped shape and is fixed to the upper surface of the driven pulley 112 (another driven pulley). In this embodiment, four stopper bodies 140 are fixed to the driven pulley 112. The four stopper bodies 140 are arranged at 90 degree intervals.

The cylinder device 150 is an air cylinder having a cylinder body 150a and a piston 150b. The cylinder device 150 is connected to the control device 70. When the cylinder device 150 receives an operation command signal from the control device 70, the cylinder device 150 projects the piston 150b from the cylinder body 150a. The cylinder device 150 is arranged in the vicinity of the driven pulley 112, and the piston 150b is projected onto the rotation trajectory of the stopper body 140.

Next, an example of the operation of the injection device drive mechanism 23 will be described.

As shown in FIGS. 5 to 7, when the drive side timing belt 115 is in a normal state, the rotation of the electric motor 105 is transmitted from the drive pulley 110 to the intermediate pulley 114 via the drive side timing belt 115. Then, the driven pulley 111 rotates together with the intermediate pulley 114, and the rotation of the driven pulley 111 is transmitted to the driven pulleys 112 and 113 via the driven side timing belt 116. The nut body rotates together with the driven pulleys 111, 112, and 113, and the injection device 20 having the heating cylinder 21 moves in the vertical direction by the screw feeding action with the ball screw shaft. In FIG. 7, when the driven pulleys 111, 112, 113 (that is, the nut body) rotate clockwise, the injection device 20 moves downward, and when it rotates counterclockwise, the injection device 20 moves upward.

In the injection device drive mechanism 23, a force that swings in the pressing direction D1 is applied to the support arm 121, and the roller 122 is pressed against the outer peripheral surface of the drive side timing belt 115. Further, the operation unit 130b of the limit switch 130 is in contact with the contact piece 121d of the support arm 121, and the limit switch 130 is in the closed state. The piston 150b is housed in the cylinder body 150a.

Then, as shown in FIGS. 8 and 9, when the drive side timing belt 115 breaks for some reason, the driven pulleys 111, 112, and 113 become rotatable, and the injection device 20 starts to move downward due to its own weight. At this time, the tension of the drive side timing belt 115 is loosened, and the support arm 121 swings in the pressing direction D1. As a result, the contact piece 121d of the support arm 121 is separated from the operation unit 130b, and the limit switch 130 is switched from the closed state to the open state. When the control device 70 detects the change of the state of the limit switch 130, the control device 70 executes an operation for ensuring the safety of the operator (safety ensuring operation) such as stopping the operation currently being executed.

The control device 70 transmits an operation command signal to the cylinder device 150 in parallel with the safety assurance operation. Upon receiving this operation command signal, the cylinder device 150 causes the piston 150b to protrude from the cylinder body 150a. As a result, the piston 150b protrudes onto the rotation trajectory of the stopper body 140 and hits the stopper body 140, the rotation of the driven pulley 112 is stopped, and the downward movement of the injection device 20 is restricted.

When the driven side timing belt 116 is broken in the injection device drive mechanism 23, the electric motor 105 moves downward of the injection device 20 by stopping the rotation of the driven pulley 111 via the drive side timing belt 115. Is regulated.

From the above, the injection molding machine 1 of this embodiment has an injection device drive mechanism 23 that moves the injection device 20 in the vertical direction. The injection device drive mechanism 23 includes a drive pulley 110 attached to the rotating shaft 105a of the electric motor 105, a plurality of driven pulleys 111, 112, 113, an intermediate pulley 114 coaxially fixed to the driven pulley 111, and a drive pulley. It has a drive-side timing belt 115 hung on the 110 and the intermediate pulley 114, and a driven-side timing belt 116 hung on the driven pulleys 111, 112, and 113. Further, the injection device drive mechanism 23 rotatably supports the roller 122 arranged so as to be in contact with the portion between the drive pulley 110 and the intermediate pulley 114 on the outer peripheral surface of the drive side timing belt 115, and the roller 122. It has a support arm 121 that can swing in the pressing direction D1 and a spring member 123 that applies a force that swings in the pushing direction D1 with respect to the support arm 121. The injection device drive mechanism 23 has a limit switch 130 arranged so that the closed state and the open state are switched when the support arm 121 is swung in the pressing direction D1.

As a result, in the injection molding machine 1, when the drive side timing belt 115 breaks, the tension is loosened and the support arm 121 swings in the pressing direction D1. Therefore, even if the drive side timing belt 115 is wound around the drive pulley 110 or the intermediate pulley 114, the support arm 121 always swings, and the closed state and the open state of the limit switch 130 are surely switched. Therefore, the breakage of the drive side timing belt 115 can be detected more reliably.

Further, the injection device drive mechanism 23 has a stopper body 140 fixed to the driven pulley 112 and rotated together with the driven pulley 112, and a closed state of the limit switch 130 when the support arm 121 is swung in the pressing direction D1. It has a cylinder device 150 that projects the piston 150b onto the rotation trajectory of the stopper body 140 in response to switching from the opened state. By doing so, when the breakage of the drive side timing belt 115 is detected, the piston 150b of the cylinder device 150 protrudes and the rotation of the driven pulley 112 is stopped, so that the movement of the injection device 20 can be restricted.

(Second Example)
Hereinafter, the injection molding machine according to the second embodiment of the present invention will be described with reference to FIGS. 10 to 17.

The injection molding machine according to the second embodiment has the same configuration as the injection molding machine 1 according to the first embodiment described above, except that it has an injection device drive mechanism 23A having a different configuration from the injection device drive mechanism 23. Hereinafter, the injection device drive mechanism 23A will be described, and the description of the same configuration as that of the injection molding machine 1 will be omitted.

10 to 15 show a normal state (not broken) of the drive side timing belt 115, and FIGS. 16 and 17 show a state in which the drive side timing belt 115 is broken. In FIGS. 10 to 17, the ball screw mechanism 102 is not shown.

The injection device drive mechanism 23A includes a drive mechanism main body 101, a ball screw mechanism 102, an electric motor 105, a drive pulley 110, driven pulleys 111, 112, 113, an intermediate pulley 114, a drive side timing belt 115, and the like. It has a driven side timing belt 116, a support arm 121, a roller 122, a spring member 123, and a limit switch 130. Further, the injection device drive mechanism 23A has a rotation restricting arm 124 and a rotation restricting body 125. The injection device drive mechanism 23A does not have the stopper body 140 and the cylinder device 150, but may have the stopper body 140 and the cylinder device 150 as in the injection device drive mechanism 23.

The rotation restricting arm 124 is fixed to the other end 121b of the support arm 121. The rotation restricting arm 124 has an arc shape and extends from the other end 121b toward the driven pulley 111. The rotation restricting arm 124 is swung around the swing shaft 121c together with the support arm 121.

The rotation restricting body 125 is attached to the tip end portion (end portion on the driven pulley 111 side) of the rotation restricting arm 124. In this embodiment, the rotation restricting body 125 is made of metal or a hard synthetic resin. The rotation restricting body 125 has a protrusion 125a that meshes with the teeth on the outer peripheral surface of the driven pulley 111, and a protrusion 125b that meshes with the teeth on the inner peripheral surface of the driven side timing belt 116. The rotation restricting body 125 is arranged so as to enter between the driven pulley 111 and the driven side timing belt 116 when the rotation restricting arm 124 is swung in the pressing direction D1 together with the support arm 121. Specifically, the rotation restricting body 125 includes the teeth of the driven pulley 111 and the driven side timing belt 116 when the nut body of the ball screw mechanism 102 moves downward (that is, when the driven pulley 111 rotates clockwise). It is arranged so as to enter the portion C1 (FIGS. 13 and 15) which is the starting point of the meshing with the teeth. As the rotation restricting body 125, for example, a strip-shaped member having flexibility made of carbon fiber or the like that is resistant to breakage may be adopted.

Next, an example of the operation of the injection device drive mechanism 23A will be described.

As shown in FIGS. 10 to 15, the injection device drive mechanism 23A operates in the same manner as the above-mentioned injection device drive mechanism 23 when the drive side timing belt 115 is in a normal state.

Then, as shown in FIGS. 16 and 17, when the drive side timing belt 115 breaks for some reason, the driven pulleys 111, 112, and 113 become rotatable, and the injection device 20 starts to move downward due to its own weight. At this time, the tension of the drive side timing belt 115 is loosened, and the support arm 121 swings in the pressing direction D1. As a result, the contact piece 121d of the support arm 121 is separated from the operation unit 130b, and the limit switch 130 is switched from the closed state to the open state. When the control device 70 detects the change of the state of the limit switch 130, the control device 70 executes the safety ensuring operation.

Further, when the support arm 121 swings in the pressing direction D1, the rotation restricting arm 124 also swings in the pushing direction D1 together with the support arm 121, and the rotation restricting body 125 moves between the driven pulley 111 and the driven side timing belt 116. enter in. As a result, the protrusion 125a of the rotation restricting body 125 and the teeth of the driven pulley 111 mesh with each other, and the protrusion 125b and the teeth of the driven side timing belt 116 mesh with each other, the rotation of the driven pulley 111 stops, and the lower part of the injection device 20. Movement to is restricted.

The injection molding machine according to the second embodiment also has the same effect as the injection molding machine 1 according to the first embodiment described above.

Further, in the injection device drive mechanism 23A, the support arm 121 is arranged so as to intersect the drive side timing belt 115 at a position between the drive pulley 110 and the intermediate pulley 114. A roller 122 is arranged at one end 121a of the support arm 121. The other end 121b of the support arm 121 is provided with a swing shaft 121c parallel to the rotation shaft 105a of the electric motor 105 and a rotation control arm 124 extending toward the driven pulley 111. Then, at the tip of the rotation restricting arm 124, a rotation restricting body that enters between the driven pulley 111 and the driven side timing belt 116 when the rotation regulating arm 124 is swung in the pressing direction D1 together with the support arm 121. 125 is attached. By doing so, when the drive side timing belt 115 breaks, the rotation restricting body 125 mechanically enters between the driven pulley 111 and the driven side timing belt 116 without the control by the control device 70. As a result, the rotation restricting body 125 is engaged with the driven pulley 111 and the driven side timing belt 116, the rotation of the driven pulley 111 is stopped, and the downward movement of the injection device 20 can be more reliably regulated.

Further, the rotation restricting body 125 has protrusions 125a and 125b that mesh with the teeth of the driven pulley 111 and the teeth of the driven side timing belt 116. By doing so, the protrusions 125a and 125b mesh with the teeth of the driven pulley 111 and the teeth of the driven side timing belt 116, the rotation of the driven pulley 111 is stopped, and the downward movement of the injection device 20 is more reliable. Can be regulated.

Further, the injection device drive mechanism 23A has a plurality of ball screw mechanisms 102 having a ball screw shaft arranged along the vertical direction and a nut body screwed to the ball screw shaft. Each nut body of the plurality of ball screw mechanisms 102 is fixed to the driven pulleys 111, 112, 113. Then, the rotation restricting body 125 is arranged so as to enter the portion C1 which is the starting point of meshing between the teeth of the driven pulley 111 and the teeth of the driven side timing belt 116 when the nut body moves downward. By doing so, the driven pulley 111 and the driven side timing belt 116 rotate in the direction of pulling in the rotation restricting body 125 that has entered the location C1. Therefore, the rotation restricting body 125 can be reliably engaged by the driven pulley 111 and the driven side timing belt 116.

Although the embodiments of the present invention have been described above, the present invention is not limited to these examples. Those skilled in the art can practice the invention in various other embodiments without departing from the gist of the invention.

1 ... Injection molding machine, 5 ... Base, 10 ... Mold clamping device, 11 ... Rotary table, 11a ... Top surface, 12 ... Movable die plate, 12a ... Through hole, 13 ... Rotation drive mechanism, 14 ... Mold clamping drive mechanism, 20 ... Injection device, 21 ... Heating cylinder, 21a ... Nozzle, 22 ... Screw, 23 ... Injection device drive mechanism, 24 ... Screw drive mechanism, 40 ... Molded article take-out device, 41 ... Mold opening / closing device, 42 ... Ejector device, 43 ... Extractor, 60 ... Display input device, 61 ... Display device, 62 ... Input device, 70 ... Control device, 80 ... Mold, 81 ... Upper mold, 82 ... Lower mold, 84 ... Cavity, 101 ... Drive mechanism body, 102 ... Ball screw mechanism, 105 ... Electric motor, 105a ... Rotating shaft, 110 ... Drive pulley, 111, 112, 113 ... Driven pulley, 114 ... Intermediate pulley, 115 ... Drive side timing belt, 116 ... Driven side Timing belt 117 ... Tension pulley, 121 ... Support arm, 121a ... One end, 121b ... The other end, 121c ... Swing shaft, 121d ... Contact piece, 122 ... Roller, 123 ... Spring member, 124 ... Rotation control arm, 125 ... rotation control body, 125a, 125b ... protrusion, 130 ... limit switch, 130a ... switch body, 130b ... operation unit, 140 ... stopper body, 150 ... cylinder device, 150a ... cylinder body, 150b ... piston , D1 ... Pushing direction, P1 ... Injection station, P2 ... First cooling station, P3 ... Second cooling station, P4 ... Molded article take-out station

Claims (6)

An injection molding machine having a drive mechanism for driving a movable body.
The drive mechanism
The drive pulley attached to the rotating shaft of the electric motor,
With multiple driven pulleys,
An intermediate pulley coaxially fixed to one of the plurality of driven pulleys,
A drive-side timing belt mounted on the drive pulley and the intermediate pulley,
The driven side timing belts hung on the plurality of driven pulleys,
A roller arranged so as to be in contact with a portion between the drive pulley and the intermediate pulley on the outer peripheral surface of the drive side timing belt.
A support arm that rotatably supports the roller and swings in a direction in which the roller is pressed against the drive-side timing belt (hereinafter referred to as "pressing direction").
A spring member that applies a force to swing the support arm in the pressing direction, and
An injection molding machine comprising: a limit switch arranged so as to switch between a closed state and an open state when the support arm is swung in the pressing direction. A stopper body fixed to another driven pulley among the plurality of driven pulleys and rotated together with the other driven pulley.
It has a cylinder device that projects a piston onto the rotation trajectory of the stopper body in response to switching between the closed state and the open state of the limit switch when the support arm is swung in the pressing direction. The injection molding machine according to claim 1. The support arm is arranged at a position between the drive pulley and the intermediate pulley so as to intersect the drive side timing belt.
The roller is arranged at one end of the support arm.
At the other end of the support arm, a swing shaft parallel to the rotation shaft of the electric motor and a rotation control arm extending to the driven pulley side are provided.
At the end of the rotation restricting arm on the driven pulley side, the one driven pulley and the driven side timing belt are attached to the end of the rotation restricting arm when the rotation restricting arm is swung in the pressing direction together with the support arm. The injection molding machine according to claim 1 or 2, wherein a rotation restricting body that enters between the injection molding machines is attached. The injection molding machine according to claim 3, wherein the rotation restricting body has a protrusion that meshes with the tooth of the driven pulley and the tooth of the driven side timing belt. The injection molding machine according to claim 3, wherein the rotation restricting body is a strip-shaped member having flexibility. The drive mechanism has a plurality of ball screw mechanisms having a ball screw shaft arranged along the vertical direction and a nut body screwed to the ball screw shaft.
The nut body is fixed to the driven pulley,
3. The rotation restricting body is arranged so as to enter a position that becomes a starting point of engagement between the teeth of the driven pulley and the teeth of the driven side timing belt when the nut body moves downward. The injection molding machine according to any one of claims 5.

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