JP2003266499A - Plastication moving apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately adjust the tension of an endless member, to prevent the occurrence of irregularity in nozzle touch force and to simplify maintenance/ control work. <P>SOLUTION: A plastication moving apparatus has a support plate, a mold holding member, an injection device main body part arranged in a freely advancing and retreating state and equipped with an injection device frame, a cylinder member and an injection nozzle, and a plastication moving unit arranged to the rear part of the injection device main body part to move the injection device main body part with respect to the support plate. The plastication moving unit is equipped with a nozzle touch drive part, a drive wheel, a follower wheel, an idler wheel receiving the rotation of the drive wheel to be rotated and a tension adjusting mechanism for moving the endless member and the idler wheel to adjust the tension of the endless member. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a plasticizing and moving device.

[0002]

2. Description of the Related Art Conventionally, in an injection molding machine, a resin heated and melted in a heating cylinder is injected at a high pressure to fill a cavity space of a mold device.
After cooling and solidifying in the cavity space, the molded product is taken out.

The injection molding machine comprises a mold device, a mold clamping device, and an injection device. The mold device includes a fixed mold and a movable mold. The mold clamping device includes a fixed platen, a movable platen, and a mold. A mold closing motor and the like are provided, and by driving the mold clamping motor to move the movable platen forward and backward relative to the fixed platen, mold closing, mold clamping and mold opening of the mold device are performed.

On the other hand, the injection device includes a heating cylinder that heats and melts the resin supplied from the hopper, an injection nozzle that injects the melted resin, and the like. Moreover, it is rotatably arranged. Then, the screw is moved forward by driving the injection motor, so that the resin is injected from the injection nozzle, is rotated by driving the measuring motor, and is retracted accordingly, whereby the resin is measured. .

When injecting resin from the injection nozzle, the main body of the injection device is advanced by the plasticizing and moving device, the front end of the injection nozzle is brought into contact with the fixed platen, and nozzle touch is performed.

FIG. 2 is a front view showing an outline of a conventional injection molding machine, FIG. 3 is a side sectional view showing an outline of a conventional injection apparatus, and is an XX sectional view of FIG.

In the figure, 11 is a base plate and 12
Is an injection device disposed on the base plate 11, 13
Is a mold clamping device disposed on the base plate 11, and the mold clamping device 13 includes a fixed platen 16, a movable platen (not shown) which is arranged so as to advance and retract with respect to the fixed platen 16, and a mold clamping device (not shown). It is equipped with a motor for use. Then, a fixed mold (not shown) is attached to the fixed platen 16, and a movable mold (not shown) is attached to the movable platen, and the fixed mold and the movable mold form a mold device. Therefore, by driving the mold clamping motor, moving the movable platen forward and backward, and bringing the movable mold into and out of contact with the fixed mold, it is possible to perform mold closing, mold clamping, and mold opening of the mold device. it can.

Further, the injection device 12 is arranged so as to be capable of advancing and retracting (moving to the left and right in FIG. 2) with respect to the base plate 11 and swingable with respect to the slide plate 22. 28, the injection device body 28 includes an injection device frame 31, a heating cylinder 14 attached to the injection device frame 31, an injection nozzle 15 attached to the front end of the heating cylinder 14 (the left end in FIG. 2), It consists of a metering motor, an injection motor 32, etc., which are not shown. In the heating cylinder 14,
The screw 14a is rotatably and movably arranged so that the screw 14a can be rotated or moved back and forth. A screw head (not shown) is arranged at the front end of the screw 14a.

The injection device frame 31 includes a front plate 34, a rear plate 35 disposed behind the front plate 34 (to the right in FIG. 2) with a predetermined distance, the front plate 34 and the rear plate 35. Four guide rods 36 installed between the plate 35 and
(Only two guide rods 36 are shown in FIG. 2) and the like, and the rear end (right end in FIG. 2) of the heating cylinder 14 is attached to the front plate 34, and the front plate 34 is provided with the weighing unit. A motor for driving is provided.

Reference numeral 37 is a ball screw. The ball screw 37 is rotatably arranged relative to the screw 14a, and is connected to the injection motor 32. A ball nut 39 is attached to the rear plate 35 by being screwed with the screw shaft 38. The ball screw 37 is generated by the injection motor 32, and the ball screw shaft 3
The rotary motion transmitted to 8 is converted into a linear motion involving rotation, that is, a rotary linear motion. And ball screw 3
7, the first motion direction changing portion is the ball screw shaft 38.
Constitutes a first conversion element, and the ball nut 39 constitutes a second conversion element. Therefore, when the injection motor 32 is driven to rotate the ball screw shaft 38, the ball screw shaft 38 is advanced and retracted and the screw 14a is advanced and retracted.

In the injection device 12 having the above structure, when the screw 14a is rotated in the forward direction by driving the measuring motor during the measuring step, the pellet-shaped resin in the hopper (not shown) is heated by the heating cylinder 14.
It enters inside, is advanced in a groove (not shown) formed in the screw 14a, is heated and melted by a heater (not shown) arranged on the outer periphery of the heating cylinder 14, and is stored in front of the screw head. At this time, the screw 14a is retracted by the pressure of the resin.

Further, during the injection process, the injection motor 3 is used.
When 2 is driven and the screw 14a is moved forward (moved to the left in FIG. 2), the resin accumulated in front of the screw head is injected from the injection nozzle 15 and is filled in the cavity space in the mold device. It

Subsequently, when the filling of the cavity space with the resin is completed, cooling water is caused to flow through the cooling flow path formed in the mold apparatus to cool the resin. When the resin solidifies, the mold is opened and the molded product is taken out.

By the way, while the cavity space is being filled with resin, unless the front end of the injection nozzle 15 and the fixed mold are in contact with each other by a predetermined pressing force, that is, the nozzle touch force, the injection nozzle 15 is fixed. Resin leaks from between the mold.

Therefore, the injection device 12 is arranged so as to be movable back and forth with respect to the base plate 11, and the injection device 12 is advanced before the injection is started, and the front end of the injection nozzle 15 is a fixed mold. Contact is made and nozzle touch is performed.

Therefore, two rails 18 are provided on the base plate 11 along the moving direction of the injection device 12.
(Only one of the rails 18 is shown in FIG. 2) is arranged in parallel with each other, and the support unit 21 and the injection device main body 28 are mounted on the rail 18 so as to be movable back and forth. The support unit 21 is a slide plate 2
2 and slide plates 23 and 24 for moving the injection device main body 28 with respect to the slide plate 22 so as to swing about the swing shaft 25. The rails 18 are moved forward and backward via the support blocks 29 attached to the lower portions of the left and right edges at a predetermined distance in the longitudinal direction.

A flange 41 is attached to the side wall of the front plate 34, and two connecting rod units 4 are provided between the flange 41 and the fixed platen 16.
3,44 are erected. The connecting rod units 43, 4
4 comprises a ball screw shaft portion 51 formed in a predetermined portion on the flange 41 side, and a rod portion 52 connected to the ball screw shaft portion 51 on the remaining portion on the fixed platen 16 side. The front end of the ball screw shaft portion 51 and the rod portion 5
2 is connected to the rear end by screwing, and the ball screw shaft portion 5
The lengths of the connecting rod units 43 and 44 can be adjusted by relatively rotating 1 and the rod portion 52. Further, a connecting member 5 for connecting the connecting rod units 43, 44 and the fixed platen 16 relatively movably to the front ends of the connecting rod units 43, 44.
3, 54 are respectively arranged, and the connecting members 53, 54
Is the block 55 fixed to the fixed platen 16 by the bolts b1 and b2, and the connecting rod units 43, 4
4 is provided with a spring 56 for urging the fixed platen 16 side, and the front end portion (left end portion in FIG. 2) of the rod portion 52 extending through the block 55 penetrates the spring 56. Further, a detent means is disposed between the front end portion of the rod portion 52 and the block 55 so that the connecting rod units 43 and 44 do not rotate with respect to the connecting members 53 and 54, respectively. .

On the front end face (left end face in FIG. 2) side of the flange 41, a motor 45 with a brake is fixed at a position on the front side of the lower edge of the flange 41, and the upper edge of the flange 41 is fixed. A first driven pulley 46 is rotatably arranged at a position on the front side, and
A second driven pulley 49 is rotatably disposed at a position on the rear side of the lower edge of the first idler pulley 42, and an idler pulley 42 is rotatably disposed at a position on the rear side of the upper edge of the flange 41. Drive pulley 4 attached to the output shaft of the motor 45
7, a timing belt 50 as a belt member between the first and second driven pulleys 46 and 49 and the idler pulley 42.
Is stretched. The drive pulley 47, the first and second driven pulleys 46 and 49, and the idler pulley 42 constitute a rotation transmission mechanism. In addition, the injection device body 2
8, the flange 41, the connecting rod units 43 and 44, and the motor 45 constitute a plasticizing moving device.

Then, the first and second driven pulleys 4
6, the ball nut 48 is attached to the ball nut 48, and the ball screw shaft portion 51 is screwed into the ball nut 48. The ball nut 48 causes the rotary motion generated by the motor 45 to be connected to the connecting rod units 43 and 44. It is converted into a rectilinear motion. The ball screw comprising the ball nut 48 and the ball screw shaft portion 51 serves as a second motion direction conversion portion, and the ball nut 48 serves as a first conversion element.
The ball screw shaft portion 51 constitutes a second conversion element.

Therefore, the motor 45 is driven to drive the first,
Ball nut 48 via the second driven pulleys 46, 49
When is rotated, the connecting rod units 43 and 44 are moved back and forth with respect to the ball nut 48. That is, when the motor 45 is driven in the forward direction, the ball nut 48 is rotated in the forward direction, and the connecting rod units 43 and 44 are moved backward (moved to the right in FIG. 2) against the biasing force of the spring 56. And the flange 41
Is advanced and a nozzle touch is performed.

When the spring 56 bends (deflects) by a predetermined amount and the nozzle touch force reaches a predetermined value,
The driving of the motor 45 is stopped and the rotational position is held by the brake. As a result, the injection device 12 is stopped at a predetermined position while the nozzle touch force is being generated.

When the motor 45 is driven in the reverse direction,
The ball nut 48 is rotated in the opposite direction, the connecting rod units 43 and 44 are moved forward, the flange 41 is moved backward accordingly, and the nozzle touch is released.

The motor 45 is attached to the flange 41 via the motor bracket 101, and the adjusting bolts b4 and b5 arranged between the motor bracket 101 and the motor 45 are rotated to rotate the timing. The tension of the belt 50 can be adjusted to prevent the nozzle touch force from varying. That is, the motor bracket 1
The reference numeral 01 designates a surrounding portion 102 surrounding the motor 45 on three sides, and a stopper portion 10 formed at an end portion of the surrounding portion 102.
3 and 104, the motor 45 is movably arranged in the surrounding portion 102. Then, the bolts b4 and b5 are screwed into the surrounding portion 102, and the bolts b4 and b5 are screwed together.
The front end (left end in FIG. 3) of the motor is brought into contact with the motor 45. Therefore, the bolts b4 and b5 are rotated leftward to bring the motor 45 closer to the flange 41 to reduce the tension, and the bolts b4 and b5 are rotated rightward to increase the tension by moving the motor 45 away from the flange 41. can do.

[0024]

However, in the conventional plasticizing moving device, the tension of the timing belt 50 is adjusted by moving the motor 45 within the surrounding portion 102. While the motor 45 is being moved, the motor 45 is stopped and the rotation position is held by the brake, so that the tension is adjusted while the rotation of the drive pulley 47 is blocked. Therefore, the tension after adjustment varies, and the nozzle touch force also varies.

Further, the timing belt 50 has the drive pulley 47, the first and second pulleys on the front end face side of the flange 41.
Since it is stretched between the driven pulleys 46 and 49 and the idler pulley 42, it is necessary to remove the connecting members 53 and 54 from the fixed platen 16 when replacing the timing belt 50. Is troublesome.

According to the present invention, the problems of the conventional plasticizing and moving device can be solved, the tension of the endless member can be accurately adjusted, and the nozzle touch force can be prevented from varying. An object of the present invention is to provide a plasticizing moving device that can simplify maintenance and management work.

[0027]

Therefore, in the plasticizing and moving apparatus of the present invention, there is provided a support plate, a mold holding member arranged on the support plate for holding a mold device, and the support plate. An injection device main body provided with an injection device frame, a cylinder member attached to the injection device frame, and an injection nozzle attached to the front end of the cylinder member, and the injection device main body part And a plasticizing moving unit for moving the injection device main body with respect to the support plate and performing a nozzle touch.

The plasticizing movement unit includes a nozzle touch drive section, a drive wheel rotated by driving the nozzle touch drive section, a driven wheel rotated by receiving the rotation of the drive wheel, An idler wheel that is rotated by the rotation of a drive wheel, an endless member that is stretched between the drive wheel, a driven wheel, and an idler wheel, and a tension adjusting mechanism that moves the idler wheel and adjusts the tension of the endless member. Equipped with.

In another plasticizing transfer device of the present invention,
Further, the driven wheel transmits rotation to a movement direction conversion unit for moving the injection device body with respect to the support plate.

In still another plasticizing movement device of the present invention, the drive wheel is a drive pulley, the driven wheel is a driven pulley, the idler wheel is an idler pulley, and the endless member is a belt. It is a member.

In still another plasticizing movement device of the present invention, the drive wheel is a drive sprocket, the driven wheel is a driven sprocket, the idler wheel is an idler sprocket, and the endless member is a chain. It is a member.

[0032]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a side view showing an outline of an injection apparatus according to an embodiment of the present invention, FIG. 4 is a front view showing an outline of an injection molding machine according to an embodiment of the present invention, and FIG. 6 is a perspective view of the plasticizing movement unit in the embodiment, FIG. 6 is a cross-sectional view showing an attached state of the plasticizing movement unit in the embodiment of the present invention, and FIG. 7 is a front view showing a main part of the injection device in the embodiment of the present invention. It is a figure.

In the figure, 11 is a base plate as a support board, 12 is an injection device arranged on the base plate 11, 13 is a mold clamping device arranged on the base plate 11, and the mold clamping device 13 is shown. Is a fixed platen 16 as a first mold holding member arranged on the base plate 11, and a movable platen (not shown) as a second mold holding member arranged so as to be movable back and forth with respect to the fixed platen 16. , And a mold clamping motor (not shown) as a mold clamping drive unit. Then, the fixed platen 16
A fixed mold (not shown) is attached and held by a movable mold (not shown) on the movable platen, and the fixed mold and the movable mold form a mold device. Therefore, by driving the mold clamping motor, moving the movable platen forward and backward, and bringing the movable mold into and out of contact with the fixed mold, it is possible to perform mold closing, mold clamping, and mold opening of the mold device. it can.

Further, the injection device 12 is arranged so as to be capable of advancing and retracting (moving to the left and right in FIG. 4) with respect to the base plate 11 and swingable with respect to the slide plate 22. 28, the injection device main body 28 is attached to the injection device frame 31, the heating cylinder 14 as a cylinder member attached to the injection device frame 31, and the front end (the left end in FIG. 4) of the heating cylinder 14. The injection nozzle 15, a metering motor (not shown) as a metering drive unit, an injection motor 32 as an injection drive unit, and the like. In the heating cylinder 14, a screw (not shown) as an injection member is rotatably and movably arranged so that the screw can be rotated or moved back and forth. A screw head (not shown) is arranged at the front end of the screw.

The injection device frame 31 includes a front plate 34, a rear plate 35 disposed behind the front plate 34 (to the right in FIG. 4) with a predetermined distance, the front plate 34 and the rear plate. Four guide rods 36 installed between the plate 35 and
(Only two of the guide rods 36 are shown in FIG. 4) and the like, and the rear end (right end in FIG. 4) of the heating cylinder 14 is attached to the front plate 34, and the front plate 34 is provided with the weighing unit. A motor for driving is provided.

Further, 37 is a ball screw, and the ball screw 37 is provided so as to be rotatable relative to the screw, and is connected to the injection motor 32, and a ball screw shaft 38 and the ball screw. A ball nut 39 screwed onto the shaft 38 and attached to the rear plate 35 is provided. The ball screw 37 is used for the injection motor 3
The rotary motion generated by 2 and transmitted to the ball screw shaft 38 is converted into rotary linear motion. The ball screw 37 constitutes a first movement direction converting portion, the ball screw shaft 38 constitutes a first converting element, and the ball nut 39 constitutes a second converting element. Therefore, when the injection motor 32 is driven to rotate the ball screw shaft 38, the ball screw shaft 38 is advanced and retracted, and
The screw is moved back and forth.

In the injection device 12 having the above structure, when the screw is rotated in the forward direction by driving the metering motor during the metering process, the pellet-shaped resin in the hopper (not shown) is heated in the heating cylinder 14. , Is advanced in the groove formed in the screw, is heated and melted by a heater (not shown) arranged on the outer periphery of the heating cylinder 14, and is stored in front of the screw head. At this time, the screw is retracted by the pressure of the resin.

In the injection process, the injection motor 3 is also used.
When 2 is driven to move the screw forward, the resin stored in front of the screw head is injected from the injection nozzle 15 and is filled in the cavity space in the mold device.

Subsequently, when the filling of the cavity space with the resin is completed, cooling water is caused to flow through the cooling flow path formed in the mold apparatus to cool the resin. When the resin solidifies, the mold is opened and the molded product is taken out.

By the way, if the front end of the injection nozzle 15 and the fixed mold are not in contact with each other by a predetermined nozzle touch force while the cavity space is filled with the resin, the injection nozzle 15 and the fixed mold are separated from each other. The resin leaks from.

Therefore, the injection device 12 is disposed so as to be movable back and forth with respect to the base plate 11, and the injection device 1
The front end of the injection nozzle 15 is brought into contact with and separated from the fixed mold as the number 2 advances and retreats. And before the injection starts
The injection device 12 is moved forward (moved to the left in FIG. 4), the front end of the injection nozzle 15 is brought into contact with the fixed mold, the nozzle is touched, and at a predetermined timing after injection is completed, The injection device 12 is retracted (moved to the right in FIG. 4), and the front end of the injection nozzle 15 separates from the fixed mold.

Therefore, two rails 18 are provided on the base plate 11 along the moving direction of the injection device 12.
(Only one of the rails 18 is shown in FIG. 4) is arranged in parallel with each other, and the support unit 21 and the injection device main body 28 are mounted on the rail 18 so as to be movable back and forth. The support unit 21 is a slide plate 2
2, and slide plates 23 and 24 for moving the injection device main body 28 with respect to the slide plate 22 so as to be swingable about a swing shaft 25. The support block 29 is attached to the lower part of the edge at a predetermined distance in the longitudinal direction,
The support unit 21 is moved back and forth on the rail 18 via a support block 29.

Further, a plasticizing movement unit 58 for advancing and retracting the injection device 12 from the rear plate 35 to the fixed platen 16 and for generating a nozzle touch force includes a rear end of the injection device main body 28 and the fixed platen 16. It is arranged to be detachable with respect to. The plasticizing movement unit 58 is a rectangular flange 59 detachably attached to the rear end of the injection device frame 31,
A motor 45 with a brake that is attached to the flange 59 and serves as a nozzle touch drive unit, and the flange 5
9, a plurality of connecting rod units 64, 6 are provided between the fixed platen 16 and the fixed platen 16.
5 and the like, by driving the motor 45,
The injection device main body 28 can be moved with respect to the base plate 11 to perform nozzle touch or release. The stationary platen 16, the injection device main body 28, the plasticizing moving unit 58 and the like constitute a plasticizing moving device.

An opening is formed in the center of the flange 59, and the rear end surface of the rear plate 35 (in the state where the injection motor 32 penetrates the opening and is floated with respect to the rear plate 35). It is removably attached to the right end surface in FIG. Therefore, the implanting pins 66 are attached to the rear end surface of the rear plate 35 at four positions by screwing. The implanting pin 66 has a male screw portion 67 for attaching to the rear plate 35, a pin body portion 68 integrally formed with the male screw portion 67, and having a smooth sliding surface on the outer periphery, and the pin body portion 68. Nut 71 formed integrally
And a rectangular head 70 formed integrally with the male screw portion 69. On the other hand, a screw hole 30 is formed in the rear plate 35 at a position corresponding to each implant pin 66, and the female pin of the screw hole 30 and the male screw portion 67 are screwed together to form the implant pin 66.
Can be attached to the rear plate 35.

Further, a pin insertion hole 73 for penetrating the implanting pin 66 is formed at a position of the flange 59 corresponding to each implanting pin 66, and the flange 59 is movable with respect to the rear plate 35. In addition, the outer peripheral surface of the pin body 68 and the inner peripheral surface of the pin insertion hole 73 are attached so as to slide. A coil spring 72 as an urging member is arranged between the rear plate 35 and the flange 59, and the pin body portion 68 penetrates the coil spring 72. The front end (left end in FIG. 6) of the coil spring 72 is brought into contact with the rear end face (right end face in FIG. 6) of the rear plate 35, and the rear end (right end in FIG. 6) is in front of the flange 59 (FIG. 6). 6, and the flange 59 is urged by a predetermined urging force in a predetermined direction, in the present embodiment, rearward (rightward in FIG. 6). The nut 71 is screwed with the male screw portion 69 so as to come into contact with the nut abutment portion 74 integrally fixed to the rear end surface of the flange 59, and functions as a stopper of the flange 59. The implanting pin 66, the nut 71, and the coil spring 72 form a floating support mechanism.

On the front end surface of the flange 59, there is provided a cam 75 as an object to be detected which is projected toward the rear plate 35, and on the rear end surface of the rear plate 35 is the cam 7.
A sensor 76 such as a proximity switch is attached as a detection unit that detects the position of the flange 59 with respect to the rear plate 35 by detecting the position of 5.

The connecting rod units 64 and 65 are arranged near the lower end on the front side and the upper end on the rear side of the injection device 12, and extend from the flange 59 to the front (left in FIG. 5). A ball screw shaft 78 rotatably arranged with respect to the flange 59 at a rear end (right end in FIG. 5), a ball nut 79 screwed at a front end (left end in FIG. 5) of the ball screw shaft 78, Two guide bars 82, 83 which extend from the ball nut 79 forward (to the left in FIG. 5) in parallel to each other, are fixed to the ball nut 79 at the rear end, and are fixed to the connecting member 81 at the front end. And extending from the connecting member 81 toward the front, and being connected to the guide bars 82 and 83 at the rear end through the connecting member 81, and at the front end. Connecting block 84 as a connecting part
And a connecting rod 85 fixed to.

Then, the ball screw shaft 78 and the ball nut 79 constitute a ball screw as a second movement direction converting portion, and the rotational movement of the ball screw shaft 78 is
The ball screw shaft 78 is converted into a rotation rectilinear motion. In addition,
The ball screw shaft 78 constitutes a first conversion element, and the ball nut 79 constitutes a second conversion element. Also,
The connecting block 84 includes a block 86 fixed to the fixed platen 16 by bolts b11 and b12, and a length adjusting mechanism 87 for adjusting the effective length of the connecting rod 85.

By the way, on the rear end surface side of the rear plate 35, the motor 45 is fixed at a position on the rear surface side of the lower edge of the flange 59, and a drive pulley as a drive wheel is attached to an output shaft (not shown) of the motor 45. 92 is rotatably arranged through a bearing (not shown), and a first driven pulley 88 as a first driven wheel is rotatably provided through a bearing (not shown) at a position on the front side of the lower edge of the flange 59. And a second driven pulley 89 as a second driven wheel is rotatably disposed via a bearing (not shown) at a position on the back side of the upper edge of the flange 59. At the position on the front side of the rim, an idler pulley 91 as an idler wheel is mounted on the bearing 90.
Is rotatably disposed through the drive pulley 92, the first and second driven pulleys 88 and 89, and the idler pulley 9.
A timing belt 93 is stretched between the belts as an endless member and a rotation transmitting member. The ball screw shaft 78 is attached to the first and second driven pulleys 88 and 89. The drive pulley 92, the first and second driven pulleys 88 and 89, and the idler pulley 9
1, the motor 45 and the connecting rod unit 6
4 and 65, a rotation transmission mechanism configured to transmit the rotation generated by the motor 45 to the ball screw shaft 78 is configured.

Therefore, the rotation generated by the drive pulley 92 by driving the motor 45 is controlled by the timing belt 9
3 to the first and second driven pulleys 88 and 89 and the idler pulley 91, and the connecting rod units 64 and 6
When each ball screw shaft 78 of No. 5 is rotated, the ball screw shaft 78 is moved back and forth with respect to the base plate 11. That is, when the motor 45 is driven in the positive direction, the ball screw shaft 78 is rotated in the positive direction, and the ball screw shaft 7 is rotated.
8 is advanced, the flange 59 is advanced against the biasing force of the coil spring 72, and with this,
The injection device 12 is moved forward and a nozzle touch is performed.

When the coil spring 72 bends by a predetermined amount and the nozzle touch force reaches a predetermined value, the position of the flange 59 is detected by the sensor 76, and a detection signal is sent to a control unit (not shown) and the control is performed. The unit stops the drive of the motor 45 and holds the rotational position by the brake. As a result, the injection device 12 is stopped at a predetermined position while the nozzle touch force is being generated.

When the motor 45 is driven in the reverse direction,
The ball screw shaft 78 is rotated in the opposite direction, the ball screw shaft 78 is retracted with respect to the base plate 11, and the flange 59 is retracted. Along with this, the injection device 12 is retracted, and the nozzle touch is released.

By the way, the idler pulley 91 is rotatably supported by the bearing 90 with respect to the adjusting plate 95 so that the tension of the timing belt 93 can be adjusted.
It is attached to the flange 59 movably in the horizontal direction via. Therefore, two elongated holes 96 which are parallel to each other are formed in the adjusting plate 95, and the bolts b13 are attached to the flange 59 by penetrating the elongated holes 96.
Therefore, each of the bolts b13 is loosened and the bolts b13 are moved along the elongated holes 96 so that the adjustment plate 9
When 5 is slid horizontally and moved and the bolt b13 is tightened at a predetermined position, the tension of the timing belt 93 can be adjusted and a tension corresponding to the position of the idler pulley 91 can be generated on the timing belt 93. The adjusting plate 95 and the bolt b13 form a tension adjusting mechanism.

In this case, when the adjusting plate 95 is moved and the idler pulley 91 is moved in the horizontal direction to adjust the tension of the timing belt 93, the idler pulley 91 can be freely rotated. Therefore, the motor 45 placed at a symmetrical position with respect to the idler pulley 91 about the axis of the screw is stopped, the rotational position is held by the brake, and the rotation of the drive pulley 92 is blocked. Even if the tension of the belt 93 is adjusted, the tension after adjustment does not vary, and it is possible to prevent variation in the nozzle touch force.

Further, a guide bar receiver 94 as a rotation stopping member is attached to the front plate 34 so that the ball nut 79 is not rotated when the ball screw shaft 78 is rotated. Grooves (not shown) for accommodating the guide bars 82 and 83 are formed in 94.

By the way, the first driven pulley 88 is arranged at the front side of the lower edge of the flange 59, and the second driven pulley 89 is arranged at the rear side of the upper edge of the flange 59. The ball screw shafts 78 of the connecting rod units 64 and 65 are also rotated at the position on the front side of the lower edge of the flange 59 and the position on the rear side of the upper edge of the flange 59. Then, at the position on the front side of the lower edge of the flange 59, one implant pin 66, one nut 71, and one coil spring 72 are disposed above and below the first driven pulley 88, respectively. Driven pulley 89
An implanting pin 66, a nut 71, and a coil spring 72 are provided one by one above and below with sandwiching therebetween.

Therefore, the flange 59 has the first and second flanges.
Of the driven pins 88 and 89 at two locations near the
Since it is supported by the coil spring 72 and is biased rearward by the coil spring 72, the coil spring 72 can be mounted in parallel with the rear plate 35 and in the vertical direction with high accuracy. As a result, the ball screw shaft 78 is surely attached to the injection device 1.
2 extends parallel to the moving direction of the ball screw shaft 7
8 and the ball nut 79 can be smoothly screwed together, and the variation in the nozzle touch force can be reduced.

When the timing belt 93 is replaced in the plasticizing movement device having the above-mentioned structure, the block 86 is removed from the stationary platen 16 because the plasticizing movement unit 58 is attached to the rear end of the injection device main body 28. Instead, the timing belt 93 can be attached and detached only by operating the adjusting plate 95 and the bolt b13. That is, the bolt b13 is loosened, and the adjustment plate 9
Just move 5 to the back side and the shaft side of the screw,
The timing belt 93 is removed from the drive pulley 92, the first and second driven pulleys 88 and 89, and the idler pulley 91, and the drive pulley 92, the first and second driven pulleys 8 are
It can be attached to 8, 89 and idler pulley 91.

Moreover, since the plasticizing moving unit 58 is detachably attached to the rear end of the injection device main body 28, the motor 45, the driving pulley 92, the first and second driven pulleys 88, 89 ,. It is possible to simplify work such as replacement and repair of attachment parts such as the idler pulley 91.

Therefore, the plasticizing and moving device can be easily maintained and managed.

When the plasticizing moving unit 58 is attached to the main body 28 of the injection device and the fixed platen 16, the guide bars 82 and 83 are inserted into the grooves of the guide bar receiver 94, and the front end surface of the flange 59 is fixed. Rear plate 3
5 and the respective male screw portions 67 are opposed to the screw holes 30, respectively, and a tool such as a wrench (not shown) is applied to the head 70 to rotate the implanting pin 66. It can be attached to the stationary platen 16. Then, the bolts b11 and b1
The plasticizing movement unit 58 can be attached to the stationary platen 16 by rotating 2. Therefore, the plasticizing movement unit 58 can be assembled very easily.

Further, since the connecting rod units 64 and 65 are installed between the rear plate 35 and the fixed platen 16 and the timing belt 93 is stretched on the rear end face side of the flange 59, the timing belt 93 is It is not necessary to remove the connecting block 84 from the stationary platen 16 when trying to replace it. Therefore, the work for maintenance and management of the plasticizing moving device can be simplified.

The idler pulley 91 may be supported as shown in FIG.

FIG. 8 is a diagram showing another support structure of the idler pulley according to the embodiment of the present invention.

In this case, the idler pulley 91 is rotatably supported by the idler support plate 100, and the idler support plate 100 is attached to the fixed plate 102 by the guide pin 101.
02 is attached to the flange 59 (FIG. 1). The guide pin 101 includes a head portion 101a, the guide pin 101 penetrates the first spring 103 between the head portion 101a and the fixed plate 102, and between the idler support plate 100 and the fixed plate 102,
The guide pin 101 penetrates the second spring 104. And 105 is a limit switch for detecting the position of the idler support plate 100.
5 is turned off when the distance between the idler support plate 100 and the limit switch 105 exceeds a threshold value. Therefore, the expansion of the timing belt 93 can be detected based on the position of the idler support plate 100, an alarm can be generated, and the operator can be prompted to replace the timing belt 93. Instead of the limit switch 105, a switch that turns on when the distance exceeds a threshold value can be used. Further, instead of the limit switch 105, the idler support plate 100
It is also possible to use a switch for detecting the movement amount of the.

Further, in the present embodiment, the drive pulley is used as the drive wheel, the driven pulley is used as the driven wheel, the idler pulley is used as the idler wheel, and the belt member is used as the endless member, but the drive sprocket is used as the drive wheel. It is also possible to use a driven sprocket as the driven wheel, an idler sprocket as the idler wheel, and a chain member as the endless member.

The present invention is not limited to the above-mentioned embodiments, but can be variously modified within the scope of the present invention, and they are not excluded from the scope of the present invention.

[0069]

As described in detail above, according to the present invention, in the plasticizing and moving device, the supporting plate and the mold holding member which is disposed on the supporting plate and holds the mold device, An injection device main body portion that is disposed so as to be movable back and forth with respect to the support board, and includes an injection device frame, a cylinder member attached to the injection device frame, and an injection nozzle attached to the front end of the cylinder member; It has a plasticizing moving unit which is disposed at the rear of the injection device main body and which moves the injection device main body with respect to the support plate to perform a nozzle touch.

The plasticizing movement unit includes a nozzle touch drive unit, a drive wheel rotated by driving the nozzle touch drive unit, a driven wheel rotated by receiving the rotation of the drive wheel, An idler wheel that is rotated by the rotation of a drive wheel, an endless member that is stretched between the drive wheel, a driven wheel, and an idler wheel, and a tension adjusting mechanism that moves the idler wheel and adjusts the tension of the endless member. Equipped with.

In this case, when the idler wheel is moved and the tension of the endless member is adjusted, the idler wheel can be freely rotated. Therefore, the tension after adjustment does not vary, and it is possible to prevent variation in the nozzle touch force.

Further, since the plasticizing moving unit is attached to the rear portion of the main body of the injection apparatus, the endless member can be attached / detached only by operating the tension adjusting mechanism.
Moreover, since the plasticizing movement unit is arranged at the rear part of the main body of the injection apparatus, it is possible to simplify operations such as replacement and repair of attachment parts such as the nozzle touch drive section and the rotation transmission mechanism.

As a result, the plasticizing and moving device can be easily maintained and managed.

[Brief description of drawings]

FIG. 1 is a side view schematically showing an injection device according to an embodiment of the present invention.

FIG. 2 is a front view showing an outline of a conventional injection molding machine.

FIG. 3 is a side sectional view showing an outline of a conventional injection device.

FIG. 4 is a front view showing the outline of the injection molding machine according to the embodiment of the present invention.

FIG. 5 is a perspective view of a plasticizing movement unit according to the embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a mounted state of the plasticizing moving unit according to the embodiment of the present invention.

FIG. 7 is a front view showing a main part of the injection device according to the embodiment of the present invention.

FIG. 8 is a diagram showing another support structure of the idler pulley according to the embodiment of the present invention.

[Explanation of symbols]

11 base plate 14 Heating cylinder 15 injection nozzle 16 Fixed platen 28 Injection device body 31 injection device frame 37 ball screw 45 motor 58 Plasticizing Transfer Unit 88, 89 First and second driven pulleys 91 idler pulley 92 Drive pulley 93 Timing belt 95 Adjustment plate b13 bolt

Claims (4)

[Claims] 1. (a) a support board, (b) a mold holding member which is provided on the support board and holds a mold device, and (c) which is provided so as to be movable back and forth with respect to the support board. An injection device frame, an injection device body provided with an injection device frame, a cylinder member attached to the injection device frame, and an injection nozzle attached to the front end of the cylinder member; and (d) disposed at the rear part of the injection device body portion. And (e) the plasticizing moving unit includes a plasticizing moving unit for moving the injection device main body with respect to the support board to perform a nozzle touch, and the plasticizing moving unit includes a nozzle touch drive unit and the nozzle touch. Drive wheels that are rotated by driving the drive unit, driven wheels that are rotated by the rotation of the drive wheels, idler wheels that are rotated by the rotation of the drive wheels, and the drive wheels,
A plasticizing moving device comprising: an endless member stretched between a driven wheel and an idler wheel; and a tension adjusting mechanism for moving the idler wheel to adjust the tension of the endless member. 2. The plasticizing movement device according to claim 1, wherein the driven wheel transmits the rotation to a movement direction conversion portion for moving the injection device main body portion with respect to the support plate. 3. The driving wheel is a driving pulley, the driven wheel is a driven pulley, the idler wheel is an idler pulley, and the endless member is a belt member.
The plasticizing transfer device described in 1. 4. The drive wheel is a drive sprocket,
The plasticizing movement device according to claim 1, wherein the driven wheel is a driven sprocket, the idler wheel is an idler sprocket, and the endless member is a chain member.