JP2002144275A - Conveying device and injection molding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conveying device capable of reducing the power consumption by interrupting the power supply to a servo motor when the conveying device is in a standby state. SOLUTION: A resin injection molding device 1 comprising an injection device 2 for forming a molding 7, and the conveying device 11 for conveying the molding 7 from the injection device 2, has a control part 8, the conveying deice 11 has a chuck part 12 for conveying the molding 7 and a Z-axis servo motor 15 for vertically driving the chuck part 12, and a Z-axis servo control circuit 23 for driving and controlling the Z-axis servo motor 14 is composed of a mechanical brake 20 for braking a driving shaft to the vertical direction of the chuck part 12, a switch 17 located between a power source part 16 and the servo driver 19, and a switch 18 located between the power source part 16 and the mechanical brake 20. In the standby state of the conveying device 11, the mechanical brake 20 is operated by controlling the switches 17, 18, and the power supply to the servo driver 19 is interrupted. Whereby the power consumption can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer device for transferring a workpiece and an injection molding device.

[0002]

2. Description of the Related Art A resin molded product molded by a resin injection molding machine is conveyed to a predetermined position by a conveying device provided in the resin injection molding machine. As the driving means of the transfer device,
For example, a servomotor is used. The conveying device conveys the molded resin molded article to a predetermined position during the time when the resin molding is being performed by the resin injection molding machine. Then, the transfer device is on standby at the standby position until the next resin molded product is formed. While waiting at the standby position, a holding current is supplied to the servomotor to keep the transport device stationary.

[0003]

As described above, in the conventional transfer apparatus, the electric power is consumed because the holding current is supplied to the servomotor while waiting at the standby position. The present invention has been devised to solve such a problem, and when the transfer device is in a standby state, a transfer device capable of reducing power consumption by cutting off power supply to a servomotor. The purpose is to provide.

[0004]

According to a first aspect of the present invention, there is provided a transfer apparatus as set forth in claim 1. According to the first aspect of the present invention, there is provided a transport device in which a brake is applied to the transport unit and the power supply to the motor is shut off when the transport unit is on standby. For this reason,
The power consumption of the motor can be reduced. Also, the second
The present invention is a transfer device as described in claim 2. According to the second aspect of the present invention, when the transport means is stopped at the predetermined position for the predetermined time, the brake is applied to the transport means and the power supply to the motor is shut off. According to a third aspect of the present invention, there is provided a transfer device as described in claim 3. According to the third aspect of the present invention, when the transport means stops at the predetermined position for the predetermined time, the brake is applied to the transport means and the power supply to the motor is shut off. The use of the transfer device according to claims 2 and 3 reduces wear of the braking portion of the mechanical brake. A fourth invention is an injection molding apparatus as described in claim 4. According to the invention of claim 4, for example, during the time when molding is performed by the injection molding machine, the molded resin molded product is transported to a predetermined position, and the transport device is operated until the next molded product is molded. While waiting at the standby position, the power of the motor can be turned off. Therefore, when the transport device is set in the standby state, the power consumption of the motor can be reduced.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. 1 to 4 are diagrams showing an embodiment of the present invention. FIG. 1 is a schematic perspective view of a resin injection molding machine provided with a transfer device. FIG. 2 is a side view of the resin injection molding machine. FIG. 3 shows a resin injection molding machine shown in FIG.
FIG. 4 is a front view of the transport device as viewed from the direction of the arrow shown in FIG. FIG. 4 is a diagram illustrating a Z-axis servo control circuit of the transfer device.
The driving direction of the transport device is indicated by an arrow in FIG. 1 in the X-axis direction (track X) extending in the width direction of the resin injection molding machine, the Y-axis direction (track Y) extending in the longitudinal direction, and the Z-axis extending in the up-down direction. Direction (trajectory Z). The direction indicated by the arrow in FIG.

[0006] As shown in FIG. 1, an injection device 2 and a transport device 11 are mounted on the resin injection molding machine 1. The injection device 2 is provided with a hopper dryer 3, a heating cylinder 4, and a fixed mold (not shown). The fixed mold is attached to the fixed mold holder 5. The resin injected from the heating cylinder 4 is molded by a fixed mold to form a molded product 7. Transfer device 1
An X-axis servomotor 13, a Y-axis servomotor 14, and a Z-axis servomotor 15 are attached to 1 so that the chuck portion 12 can reciprocate along a trajectory X, a trajectory Y, and a trajectory Z. The transfer device 11 is mounted and fixed to the fixed mold holder 5 via the leg 6. The X-axis servo motor 13 is provided with an X-axis encoder (not shown), the Y-axis servo motor 14 is provided with a Y-axis encoder (not shown), and the Z-axis servo motor 15 is provided with a Z-axis encoder 21. The position of the chuck unit 12 is detected by an X-axis encoder and a Y-axis encoder.
The axis is detected by the axis encoder and the Z-axis encoder 21. The chuck portion 12 holds the molded product 7 with the claw 1
2a, and includes a rotation mechanism that changes the gripping direction of the claw 12a. The transfer device 11 includes the injection device 2
The claw 1 of the chuck portion 12 for taking out the molded product 7 molded by
2a, the molded article 7 is conveyed to a predetermined position,
The molded part 7 is opened by opening the chuck part 12.

Next, as shown in FIG. 4, the control section 8 is provided with a central processing unit (CPU) 9, and storage means such as a RAM and a ROM. The CPU 9 controls the injection device 2 based on the control program stored in the storage unit.
And the transfer device 11 are controlled. As shown in FIG. 4, the Z-axis servo control circuit 22 that drives the chuck unit 12 in the Z-axis direction includes a power supply unit 16, a switch 17, a switch 18,
It has a servo driver 19 and a Z-axis servo motor 15. The servo driver 19 drives and controls the Z-axis servo motor 15 by, for example, a PWM control circuit. A mechanical brake 20 is provided on a drive shaft of the chuck section 12 driven by the Z-axis servo motor 15. here,
Supplementary information on the mechanical brake 20 is provided. The mechanical brake 20 is a brake that brakes a drive shaft and a transport shaft of a transport device using friction. Further, for example, a braking device that decelerates or stops using the friction with respect to the rotational drive of the servomotor normally mounted on the servomotor can be used as the mechanical brake 20. Power supply unit 16
Are connected to a servo driver 19 via a switch 17. The power supply unit 16 is connected to a mechanical brake 20 via a switch 18. The switches 17 and 18 are controlled to open and close by the control unit 8. The X-axis servo motor 13 and the Y-axis servo motor 14 have an X-axis servo control circuit and a Y-axis servo control circuit, similarly to the Z-axis servo motor 15. However, the switch 1 is provided for the X-axis servo control circuit and the Y-axis servo control circuit.
8 is not provided. The operation unit 23 inputs an operation signal and the like.

Next, the operation of the transport device 11 will be described with reference to FIGS. FIG. 5 is a process chart showing a basic operation of transporting the molded article 7 by the transport device 11. FIG.
FIG. 5 is a flowchart illustrating an operation including a standby process of the transport device 11. Here, the standby processing refers to the transfer device 11
During standby, the control unit 8 operates the mechanical brake 20 at the standby position A and shuts off power supply to the Z-axis servomotor 15. As shown in FIG. 5, the basic operation of the transfer device 11 includes a total of seven steps from a transfer step to an opening step. The operation origin of the chuck portion 12 is set at the moving end which is the open position in the X-axis direction, the moving end at the pickup standby position A side of the molded article 7 in the Y-axis direction, and the highest moving end in the Z-axis direction. In the operation preparation state of the resin injection molding machine 1 (before the molding starting state), the operation unit 23 is operated, and the control unit 8 automatically moves the chuck unit 12 to the operation origin position. In the present embodiment, for example, when the position of the chuck unit 12 is adjusted to the operation origin, the operation origin is set as an operation start point at which the operation of the transfer device 11 starts.

In the standby position A, when the chuck portion 12 is
The position to wait to take out. The take-out position B, as shown in FIG. 2, refers to the position of the chuck portion 12 where the claw 12 a of the chuck portion 12 can grab and remove the molded product 7 from the injection device 2. The retreat position C refers to the position of the chuck portion 12 which retreats with the chuck portion 12 gripping the molded product 7 and rises from the stopped position. The descent start position D refers to a position where the chuck part 12 can be lowered to release the molded product 7. The release position E is a position where the claw 12a of the chuck portion 12 is released to release the molded product 7. When the processing of the molded article 7 is started by the injection device 2, the transfer device 11 moves the chuck portion 12 from the operation start point to the standby position A shown in FIG. 2 (transfer step). The transport device 11 waits at the standby position A from when the chuck unit 12 stops at the standby position A until the injection device 2 completes molding. At this time, if the direction in which the chuck unit 12 grips the molded product 7 is restricted, the chuck unit 12 is rotated to set the direction in which the gripping mechanism of the chuck unit 12 can grip the molded product 7 (a standby process). ). When the molded article 7 is molded, the chuck unit 12 is moved from the standby position A to the unloading position B (entering step). After the movement is stopped, the molded product 7 is gripped by the chuck unit 12 and the molded product 7 is taken out from the injection device 2 (a take-out step). The chuck portion 12 holding the molded product 7 is
It is moved from the extraction position B to the exit position C (exit step). Here, when it is necessary to change the direction of the molded product 7, the gripping mechanism of the chuck unit 12 is rotated. After that, it is moved from the retreat position C to the lowering start position D (opening side traveling step). After lowering the chuck portion 12 from the lowering start position D to the opening position E, the molded product 7 is opened.
(Opening process).

Next, the Z-axis servo motor 1 of the transfer device 11
The drive control of No. 5 will be described with reference to the flowchart of FIG. Here, the operation of the resin injection molding machine 1 is completed, and the chuck portion 12 is adjusted to the operation origin. When the chuck unit 12 is returned to the operation origin, the operation of the chuck unit 12 starts from the operation origin. Next, when the start of molding is operated in this state, the chuck portion 12 is
It is moved from the operation start point to the standby position A (extraction standby position movement). Next, in step S2, when it is determined that the chuck unit 12 has moved to the standby position A, the control unit 8 closes the switch 18 to cut off the power supply to the mechanical brake 20, and stops the mechanical brake 20. Operation (brake-on)
Let it. Then, in step S3, the control unit 8 issues a cutoff command to the servo driver 19 to cut off the power supply to the Z-axis servomotor 15.

Next, in step S4, it is determined whether a predetermined time from the start of molding to the completion of molding has elapsed. If the predetermined time has elapsed, the process proceeds to step S5. On the other hand, if the predetermined time has not elapsed, step S8
Proceed to. Next, in step S5, the control unit 8 outputs a control signal to the servo driver 19 to supply power to the Z-axis servo motor 15. In step S6, the control unit 8
Opens the switch 18 to supply power to the mechanical brake 20 to stop the operation of the mechanical brake 20 (brake off). Further, in step S7, the injection device 2
It is determined whether or not a molding completion signal has been output from. If the molding completion signal has been output, the process proceeds to step S11, and a process of transporting the molded product 7 molded by the injection device 2 is executed. In step S7, the chuck unit 12 waits at the standby position A until the molding completion signal is output.

On the other hand, in step S8, it is determined whether or not a molding completion signal has been output from the injection device 2. If the molding completion signal has been output, the process proceeds to step S9. If no molding completion signal is output, the process returns to step S4.
In step S9, the control unit 8 closes the switch 17, outputs a control signal to the servo driver 19, and supplies power to the Z-axis servo motor 15. Step S10
Then, the controller 8 opens the switch 18 to supply power to the mechanical brake 20 to stop the operation of the mechanical brake 20 (brake off).

Next, in step S11, the control unit 8
The chuck unit 12 is lowered from the standby position A (down).
Next, in step S12, the control unit 8 controls the chuck unit 1
2 is advanced from the lowered position to the removal position B (forward).
Next, in step S13, the control unit 8
After moving 2 to the removal position B, the gripping mechanism of the chuck section 12 is driven to grip the molded product 7 with the claw 12a (molded product gripping <chuck>).

Next, in step S14, the control unit 8
With the molded product 7 held by the claws 12a of the chuck portion 12, the chuck portion 12 is retracted from the extraction position B to the lowered position (retreat). Next, in step S15, the control unit 8
Raises the chuck portion 12 from the lowering position to the retreat position C (up). Next, in step S16, the control unit 8
Moves the chuck unit 12 from the retreat position C to the descent start position D (descent start position movement).

Next, in step S17, the control unit 8
The chuck unit 12 is lowered from the lowering start position D to the open position E (down). Next, in step S18, the control unit opens the molded product 7 by releasing the claws 12a of the chuck unit 12 at the release position E (mold product release). Next, in step S19, the control unit 8 raises the chuck unit 12 from the open position E to the lowered open position D in order to transport the next molded article 7. After the upward movement, the chuck unit 12 is moved to the standby position A, and the processing from step S1 is continued (orbit Y upward).

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 7 is a flowchart illustrating a standby process of the transport device. In the step illustrated in FIG. 7, the predetermined operation has been started, and the standby process of the chuck unit 12 is started. First, in this state, in step S21, the chuck unit 12 is moved to a predetermined position. Next, in step S22, the time from the start of the predetermined operation is measured by a timer, and it is determined whether the predetermined time has elapsed. If the predetermined time has elapsed, the process proceeds to step S23. If the predetermined time has not been reached, the process waits in step S22 until the predetermined time has elapsed.

Next, in step S23, the control unit 8
The switch 18 is closed to shut off the power supply to the mechanical brake 20, and the mechanical brake 20 is operated (brake-on). Then, in step S24, the control unit 8
Issues a cutoff command to the servo driver 19 to cut off the power supply to the Z-axis servomotor 15. Next, in step S25, the control unit 8 determines whether the predetermined operation has been completed. When the predetermined operation is completed, step S26
Proceed to. If the predetermined operation has not been completed, the process waits in step S25 until the predetermined operation is completed. Next, in step S26, the control unit 8 outputs a control signal to the servo driver 19 to supply power to the Z-axis servo motor 15. Next, in step S27, the control unit 8 opens the switch 18, supplies power to the mechanical brake 20, and stops the operation of the mechanical brake 20 (brake off), and the process ends.

As described above, in the present embodiment, while the chuck unit 12 is waiting at the standby position, the control unit 8 activates the mechanical brake 20 and turns off the servo driver 19 to turn off the Z-axis servo. The power supply to the motor 15 is cut off. Therefore, power consumption when the transport device 11 is in the standby state can be reduced.

The present invention is not limited to the above-described embodiment, and may be appropriately changed without departing from the gist of the present invention. For example, in the present embodiment, a brake is actuated for driving in the Z-axis direction (vertical direction),
Although the supply of power to the Z-axis servomotor 15 is cut off, the present invention can be applied to, for example, driving in the X-axis and Y-axis directions. The block diagram shown in FIG. 5 and the flowchart shown in FIG. 6, and the control method of the injection device 2 and the transport device 11 can be variously changed. Further, the structure, configuration, operation, and the like of the injection device 2 and the transport device 11 can be variously changed. Further, the X-axis servomotor 13, the Y-axis servomotor 14, and the Z-axis servomotor 1
5, the motor for driving the transport device 11 can be variously changed. The basic operation and operation of the transport device 11 can be variously changed. In addition, PWM
The control circuit may be provided in the servo driver or in the control unit. In addition, although the supply of power to the Z-axis servomotor 15 is cut off by controlling the switch 18, a control for cutting off the supply of power to the Z-axis servomotor 15 inside the servo driver 19 may be used. The standby state of the transport unit can be determined, for example, by the transport unit being stopped at a predetermined position for a predetermined time. In the embodiment, the transfer device 11 waits at the standby position when the transfer device 11 stops at the standby position A for a certain period of time. However, for example, the transfer device 11 may stop at a position other than the standby position A for a certain period of time. The interpretation of the concept of the standby of the device 11 can be changed as appropriate. The mechanical brake 20 is operated when the transfer device 11 is made to stand by at the standby position.
0 may be activated. In the embodiment, the injection molding machine 1 and the transfer device 11 are described as an injection device. However, the present invention can be configured as a processing device including a processing machine and a transfer device.

[0020]

As described above in detail, in the transfer apparatus and the injection molding apparatus according to the present invention, the power supply to the motor can be temporarily cut off when the transfer means is on standby, thereby reducing power consumption. Can be.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a resin injection molding machine provided with a transfer device according to the present embodiment.

FIG. 2 is a side view of the resin injection molding machine.

FIG. 3 is a front view of the transfer device when the resin injection molding machine is viewed from a direction of an arrow shown in FIG. 1;

FIG. 4 is a block diagram illustrating a Z-axis servo control circuit of the transfer device.

FIG. 5 is a process chart showing a basic operation of transporting a molded article by a transport device.

FIG. 6 is a flowchart illustrating an operation of the transport device according to the first embodiment.

FIG. 7 is a flowchart illustrating an operation of the transport device according to the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Resin injection molding machine 2 ... Injection apparatus 11 ... Conveying apparatus 15 ... Z-axis servomotor 17 ... Switch 18 ... Switch 20 ... Mechanical brake 22 ... Z-axis servo control circuit A ... Standby position B ... Extraction position

Continued on the front page (72) Inventor Masanori Yokoi 2-36, Shimosaka-cho, Mizuho-ku, Nagoya-shi, Aichi Prefecture Inside Star Seiki Co., Ltd. F-term (reference) in Taitec Corporation 3C007 AS05 BS03 HS27 HT40 KV01 LV00 LV21 MT13 4F202 CA11 CB01 CM11 4F206 JA07 JM06 JN41 JT06 JT33

Claims (4)

[Claims] 1. A transport device for transporting a workpiece, a motor for driving the transport device, a mechanical brake for braking the transport device, and a control device, wherein the control device includes a mechanical brake when the transport device is on standby. A transfer device that activates and shuts off power supply to the motor. 2. The transfer device according to claim 1, wherein the control unit activates the mechanical brake and shuts off power supply to the motor when stopping the transfer unit at a predetermined position for a predetermined time. Transport device. 3. The transport device according to claim 1, wherein the control unit activates the mechanical brake and shuts off power supply to the motor when the transport unit stops at a predetermined position for a predetermined time. Transport device. 4. An injection molding apparatus comprising: an injection molding machine; and a conveying device for conveying a workpiece processed by the injection molding machine, wherein the conveying device according to claim 1 is used as the conveying device. Injection molding equipment.