JPH03278932A - Motor driven injection molding device - Google Patents

Abstract

PURPOSE:To decide back pressure to be applied to a screw by only output of a back pressure giving device, by a method wherein measurement is performed under a state where rotary driving system of the screw is separated completely from straight moving driving force by changeover device of a clutch. CONSTITUTION:A hollow ball screw 6 is raised and stopped at a measurement waiting position and measurement and kneading are performed under a state where an injection clutch is detached, that is, a state where a screw 2 is detached completely from a motor 19. In other words, at the time of the measurement and kneading, only rotary driving force is applied to the screw 2 and detached completely from a straight moving driving system (the motor 19 or the ball screw 6 or a ball nut 9) in a vertical direction. Therefore, only thrust of a vertical direction by measurement of a molding material is generated in the vertical direction of the screw 2 and along with progress of the measurement the screw 2 is raised away. In this instance, the back pressure to be applied to the screw 2 to control dispersion in the measurement is decided by only output of a back pressure cylinder 22. Capacity of a measured molding material is decided by a movement distance route length of the screw 2 to be detected by a measurement completion detecting sensor 25.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an injection molding apparatus using a motor, particularly an injection molding apparatus in which linear movement and rotational movement of a screw are performed by the driving force of the motor. The present invention relates to a technology for controlling transmission switching using a detection signal from a sensor.

[Conventional technology]

Conventionally, in the injection molding method in which a molded product is manufactured by injecting a molding material such as plastic into a mold, hydraulic and electric injection devices are mainly used.
It is being

First, a conventional hydraulic injection device will be described with reference to FIG. 5. This hydraulic injection device mainly includes a hopper 71, a screw 73 for kneading and measuring resin introduced from the hopper in a cylinder 72,
It is composed of a motor 51 that rotationally drives this screw, and a direct-acting cylinder 52 that injects the kneaded resin.
The motor 51 and the direct-acting cylinder 52 are generally hydraulically driven types that can easily provide a large output. Next, the electric injection device disclosed in Japanese Patent Publication No. 61-57168 will be explained using FIG. In the figure, 53 is a screw housed in a heating cylinder 66, and this screw is fixed to a driven gear 54 for rotating the screw disposed at the rear. Reference numeral 56 denotes a support body that is slidably guided by the guide bar 57, and this support body rotatably supports the driven gear 54 for rotating the screw, and also supports the ball screw 58 whose tip abuts on the axis of the gear 54. The fitted ball nut 55 is fixed. The ball screw 58 also includes a propulsion driven gear 5.
9 is fixed. Each of the screw rotation driven gear 54 and the propulsion driven gear 59 is connected to a motor 62.
The drive gear 63.64 is disposed on the rotating shaft of the motor and connected to a drive gear 63.64 connected by a clutch 60.61.

Further, this device is provided with a back pressure brake unit 65 behind the driven propulsion gear 59, and the screw 5
The backward movement of No. 3 is pressed from the rear of this gear 59. As a result, when the screw 53 retreats by kneading and measuring the resin put into the heating cylinder 66 from the hopper 74, the pole nut 55 retreats via the gear 54 and the support 56, causing the ball gear 58 to rotate. Accordingly, the gear 59 is rotated. The back pressure brake unit 65
When the screw 53 is pressed by
This is to apply back pressure to the

[Problem to be solved by the invention]

However, the conventional injection device described above has the following problems.

That is, in a hydraulic injection device as shown in FIG. 5, (1) peripheral devices such as a hydraulic pump and piping equipment are required, so a large installation space for the injection molding machine is required.

(2) It is difficult to use an injection molding machine in a clean environment due to oil mist etc. emitted from hydraulically driven equipment.

On the other hand, in an electric injection device as shown in Fig. 6,
Although the problems of hydraulic injection devices have been solved, (1) To apply back pressure, it is necessary to use a force to convert the linear motion of a pole nut, etc., into rotational motion of a ball screw, etc. when the screw retreats, and a gear, etc. This back pressure needs to be controlled by the sum of the force generated by the slip torque of the brake that presses against the end face of the generation output, etc.), the condition settings become complicated.

(2) Since the rotationally driven gear and the propulsively driven pole nut are supported by the same support and move simultaneously with the screw, a guide to stop the rotation of the support is required and arrangement around the drive system is required. This requires a large space and the configuration is complicated.

By the way, in view of the above-mentioned conventional problems, the present inventors have proposed an electric injection device in which an electric motor performs rotational movement and linear movement of a screw housed in a heating cylinder. At the rear end, each of the rotating mechanism, the linear mechanism, and the back pressure mechanism is arranged in the order of the rotation mechanism, the linear mechanism, and the back pressure mechanism, or the order of the linear mechanism, the rotation mechanism, and the back pressure mechanism, and the rotation mechanism has a rotating shaft that rotates the screw, and a first rotational driving force transmission mechanism that transmits the rotational driving force from the motor to the rotating shaft, and the linear mechanism includes a guide having locking parts at both ends. a shaft, a hollow ball screw that is slidably fitted to the guide shaft and locked at each locking portion, a hole nut that is screwed into the hollow ball screw, and a rotation drive from the motor to the pole nut. a second rotational driving force transmission mechanism for transmitting force, and the back pressure mechanism includes a back pressure cylinder and a cylinder rod that presses the guide shaft or the rotation shaft. It was an idea.

With such a device, the device for controlling the back pressure can be configured with a simple mechanism, and this mechanism can be easily adjusted, and furthermore, the screw propulsion mechanism and the rotation mechanism can be made smaller.

In the above-mentioned electric injection device, when molding material such as resin is fed into the heating cylinder while rotating the screw, the molding material in the cylinder is kneaded and the screw is moved back, causing the kneaded molding to be carried out in front of the screw. Material accumulates.

In the present invention, between the screw that injects the molten molding material into the mold and the back pressure cylinder that applies back pressure to the screw,
Clutch switching operation in an injection molding machine equipped with clutch means for transmitting rotational motion for measuring and kneading molding materials in the screw and for transmitting linear motion for imparting injection force to the screw. To provide a device that can perform the process accurately.

[Means and actions for achieving the task]

In order to achieve the above-mentioned problems, the present invention provides a rotary motion transmitted means for a motor and a screw, a linear motion transmitted means for the screw, a back pressure applying means for applying back pressure to the screw, and a rotary motion transmitted means for the screw. comprising a clutch means for transmitting the driving force from the motor to the transmission means and the linear movement transmitted means;
The switching operation of the clutch means is performed in response to a detection signal from a detection means for detecting a travel path of the linear motion transmitted means.

In the configuration of the present invention, the operation of the clutch means is controlled by the detection signal of the detection means, and switching between the motor, the rotary motion transmitted means, and the linear motion transmitted means is performed.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1(a) is a schematic sectional view of the electric injection device according to this embodiment, FIG. 1(b) is a sectional view taken along line nn in FIG. 1(a), and FIG. 1(a), FIG. 2 is a perspective view of the rotation mechanism, linear mechanism, back pressure mechanism, clutch, and electric motor in FIG. 1, and FIG. 3 (
4A to 4E are explanatory views of the operation of this embodiment, and FIGS. 4A and 4B are flow charts and control block diagrams of injection molding by the apparatus of this embodiment.

As shown in FIGS. 1 and 2, the electric injection device of this embodiment has a screw 2 housed in a superheated cylinder l.
, a spline shaft 3 fixed to the screw 2 with a pin 4, a hollow ball screw guide shaft 5 connected above the spline shaft 3 with a bolt (not shown), and a stopper plate 7 fixed to the upper end, and a pole screw guide shaft. The hollow ball screw 6 that is slidably fitted into the cylinder rod 33 and the stopper plate 7 of the guide shaft 5, which is provided above the guide shaft 5, and the cylinder rod 33 that abuts through the thrust bearing 35 are aligned vertically in the same line. It is arranged in a shape.

A hopper 29 is connected to the superheated cylinder 1 via a pipe 28 for supplying molding material into the superheated cylinder l.

Reference numeral 19 denotes an electric motor that is arranged in parallel with these components and is controlled by a control device 30, and is fixedly installed on the injection unit base 21 that fixedly holds the superheated cylinder 1. This electric motor 19 has a joint sleeve 20.
An input shaft 18 is connected via. Two clutches 16 and 17 (the clutch 16 is referred to as a metering/mixing clutch, and the clutch 17 is referred to as an injection clutch) are fixedly attached to the input shaft 18, upper and lower. The metering/mixing clutch 16 can be connected to the input timing pulley 14, and this pulley is connected to the spline shaft 3 via the timing belt 12.
The output timing pulley 10 is connected to an output side timing pulley 10 fixed to the outer periphery of a spline nut 8 fitted to the spline nut 8. Therefore, when the clutch 16 is connected to the pulley 14, the electric motor 19
The rotational drive of the pulley 14, timing belt 12,
Timing pulley 10. The spline shaft 3 rotates via the spline nut 8, thereby causing the screw 2 to rotate. The clutch 17 is connectable to an input timing pulley 15, and the pulley 15 is connected to an output timing pulley 11 fixed to a pole nut 6 via a timing belt 13. Therefore, when the clutch 17 is connected to the pulley 15, the pole nut 9 rotates via the pulley 15, the timing belt 13, and the timing pulley 1 due to the rotational drive of the electric motor 19, and the hollow ball screw 6 moves up and down accordingly.

Note that the hollow ball screw 6 is provided with a protruding piece 31 whose cross section is shown in FIG.
By fitting the guide rod 32 (not shown), the hollow ball screw 6 does not rotate as the pole nut 9 rotates, and can only move linearly relative to the guide shaft 5.

As described above, the hollow ball screw 6 is slidably provided on the guide shaft 5 and is configured to move up and down as the ball nut 9 rotates. A large-diameter stopper plate 7 is fixed, and the lower end of the guide shaft 5 is also fixed to the spline shaft 3, which has a larger diameter than the hollow ball screw 6. Therefore, when the hollow ball screw 6 moves up and down, the stopper plate 7 moves upward. The spline shaft 3 contacts the spline shaft 3 at the bottom. Therefore, since the stopper plate 7, guide shaft 5, spline shaft 3, and screw 2 are integrally fixed to each other as described above, the hollow ball screw 6 rotates as the pole nut 9 interlocks with the rotational drive of the electric motor 19. By moving up and down and pushing out the upper stopper plate 7 or spline shaft 3, the screw 2 can be moved up and down within the heating cylinder 1.

The back pressure cylinder 22 is attached to the injection unit base 21 (not shown), is arranged in the same straight line as the stopper plate 7, the guide shaft 5, the spline shaft 3, and the screw 2 as described above, and moves the cylinder rod 33 up and down. Make it move.

Thereby, the cylinder rod 33 can be lowered to press the stopper plate 7 and apply back pressure to the screw 2. Note that 23 is a pressure regulator for the back pressure cylinder, which is connected to the back pressure cylinder 22 via a tube 34 and to a compressed fluid (air, etc.) supply source (not shown). Pressure control of the back pressure cylinder 22 is performed by controlling the pressure of compressed fluid using a pressure regulator 23.

With the back pressure mechanism configured as described above, thrust can be applied to the screw 2 against the pressure generated in the molten molding material accumulated in front of the screw by measuring and kneading the molding material, thereby reducing the back pressure. It is possible to prevent the generation of air bubbles, etc. that occur in the molten molding material when it is not applied. Further, the back pressure mechanism of this embodiment has the back pressure cylinder 2 as described above.
Since it is configured to be performed by the extrusion operation of 2,
The configuration is simple, the control source can be configured with a simple mechanism, and adjustment can be easily performed.

A stopper plate 7 provided at the lower end of the cylinder rod 33
The thrust bearing 35 is arranged so as to come into contact with the first
As shown in figure (C), two angular bearings 3
6.37 are stacked symmetrically, and the inner race of the bearing 36 and 37 is fixed by a nut 38 screwed into the stepped part of the cylinder rod 33 and the tip of the cylinder rod 33, and the outer race is a cylindrical member having a shoulder part 39. 40 and protrusion 4
1, and when the cylinder rod 33 comes into contact with the stopper plate 7, the cylindrical members 40, 42 rotate, and the cylinder rod 33 has bearings 36, 37 interposed therebetween. It doesn't rotate. 24,
25, 26, and 27 are sensor groups for detecting the stroke of the screw 2 or the hollow ball screw 6, 24 is a suckback completion detection sensor, 25 is a metering completion detection sensor, 26 is a screw overrun detection sensor, and 27 is a hollow This is a ball screw standby position sensor. Each of the above-mentioned sensors 24, 25, 26, and 27 is mounted so as to be able to move appropriately about the injection unit base 21 and adjust the detection position.

In this configuration, each sensor is a reflective photoelectric sensor, and the suckback completion detection sensor and the measurement completion detection sensor use the side surface of the stopper plate 7 as a sensor dog, and the hollow ball screw standby position sensor uses the side surface of the hollow ball screw 6 as a sensor dog. Each sensor is turned on when the stopper plate or hollow ball screw moves to a position where the light of each sensor hits, acting as a sensor dog. Also, for overrun, use the side surface of the hollow ball screw 6 as a sensor dog,
The sensor is configured to turn on when the hollow ball screw moves to a position where it is not exposed to light from the sensor.

Although not shown in FIG. 1(a), when actually performing injection molding, a mold for molding is placed at the tip of the heating cylinder 1, and the mold is opened/closed or clamped. Equipment, etc. for this purpose are installed.

Further, in this embodiment, it is assumed that the control device 30 is equipped with a pressure holding timer and a cooling timer in order to measure the pressure holding time and cooling time of the molded product in the mold cavity.

Next, the operation of the electric injection device of this embodiment configured as described above will be explained as shown in FIGS.
This will be explained with reference to the flowchart in FIG. A and the block diagram in FIG. 4B. Note that the symbol S in parentheses indicates a step in the flowchart of FIG.

i) Measuring/kneading mode In FIG. 3(a), the hollow ball screw 6 is in a position where the hollow ball screw standby position sensor 27 is turned ON, and at the same time, the back pressure cylinder 22 and the metering clutch 16 are also in the ON state (
Step Sl). At this time, the drive means 19A of the motor 19 inputs the output signal of the first logic means 40A, and the motor 19 rotates clockwise (step S2).

The first logic means 40A is a measuring/kneading detection sensor S2.
5, a ball screw standby position detection sensor 27, an AND circuit 1 which inputs a signal from an operation switch SW1 indicating that the device is in operation, and an inverter (negation) circuit INV-I which receives a signal from a weighing sensor 25. .

That is, in the state shown in FIG. 3(a), when the ball screw standby position detection sensor 27 is ON, the weighing sensor 25 is OFF, and the switch SW is ON, the logic means 40A causes the motor drive circuit 19A to rotate the motor 19 clockwise. At the same time, the metering/kneading clutch 16 is turned on so that the rotation of the motor 19 can be transmitted to the rotational motion transmitted means of the spline shaft 3 via the belt 12.

Furthermore, the output signal of the first logic means activates the pressure regulator 23. In this way, the motor 19 rotates clockwise (C
W; clockwise) (step S2),
The screw 2 is rotated via a timing belt 12, a spline nut 8, and a spline shaft 3, and moves up inside the overheating cylinder 1 while measuring and kneading the molding material supplied into the overheating cylinder 1.

At the same time, the back pressure cylinder 22 causes the stopper plate 7 to
Back pressure is applied to the screw 2 via the guide shaft 5 and the spline shaft 3.

ii) Metering/kneading end mode Next, when the screw 2 rises to the state shown in FIG. 3(b), the metering completion detection sensor 25 receives an ON signal (step S3).

ON signal of the metering completion detection sensor 25 and ball screw standby position detection sensor 27 as the screw 2 rises.
The ON signal is input to the second logic means 40B, and the output signal from the second logic means 40B turns off the power to the motor drive means 19A to stop the motor 19 (step S4).

Further, the metering clutch 16 and the pressure regulator are turned off by a signal from the second logic means 40B, thereby releasing the clutch and releasing the back pressure. This ends the weighing/kneading mode (step S5).

On the other hand, when the molding material is being weighed and kneaded in the cylinder 1 as described above, the molding material weighed and kneaded in the previous step is placed in a mold (not shown) provided below the cylinder 1. The molded product is cooled and the molded product is taken out. However, at this time, it is necessary to perform suckback in order to prevent the molding material kneaded in the cylinder 1 from leaking from the injection port of the cylinder 1.

1ii) Suckback mode In the aforementioned step S5, when the motor 19 is stopped and the back pressure is released, the injection clutch 17 is actuated by the output signal from the second logic means 40B, and the motor 1
9 and the ball nut 9/ball screw 6 (step S6).

A signal 17a representing the injection clutch operating state of the injection clutch 17 is output, and based on this signal 17a, a signal for rotating the motor 19 clockwise is output from the motor drive means 19A (step S7).

As a result, when the hollow ball screw 6 rises via the timing belt 13 and the pole nut 9, the stopper plate 7 is pushed up and suckback is performed.

This sack barrack is made of hollow ball screw 6 as described above.
is the suckback completion detection sensor 24 shown in FIG. 3(C).
The process continues until the switch is raised to the ON position (S8).

The ON signal of the suckback completion detection sensor 24 and the signal 17a representing the operating state of the injection clutch 17 are input to the third logic means 40c, and the third logic means 40c sends a signal to the motor drive means 19A to stop the motor 19. enters. As a result, the motor 19 stops and step S9) suckback is completed. In FIG. 3(C), a is the suckback stroke, and b is the hollow ball screw movement stroke during the suckback.

After the above-described suckback is completed, the cooling counter C1 ends counting (step 5IO). In response to the signal C1 indicating the end of counting from the cooling counter C1, the operation of the mold clamping means (not shown) of the mold is released, the mold is unclamped (step 511), the mold is opened (step 512), and the molded product is removed. After taking it out (step 513), close the mold again (
Step 514) Perform mold clamping (Step 515).

iv) Injection mode The kneaded molding material is injected into the mold clamped as described above. The injection operation is performed by rotating the motor 19 and pushing the linear movement transmitted means of the hollow ball screw 6 downward.

That is, the mold clamping signal of the mold clamping means (not shown) and the operation state signal 17a of the injection clutch 17 are input to the fourth logic means 40D, and the motor 19 is rotated counterclockwise ( CCW H counter clock
width) (step 516). At this time, since the injection clutch 17 is still in the ON state, when the motor 19 is rotated counterclockwise, a downward thrust is applied to the hollow ball screw 6. At this time, the hollow ball screw 6 is first fed, and then, as shown in FIG. 3(d),
The lower end of the hollow ball screw 6 hits the spline shaft shoulder 3a, pushing the screw 2 downward and injecting it into the mold. Note that since the back pressure cylinder 22 is turned off, the cylinder rod 33 remains in the position shown in FIG. 3(c). The control device 30 controls the motor 19 during injection, detects a change in the current consumption value of the motor 19 at the time of completion of injection (318), and controls the motor for injection by changing the current value from speed control (S17). The control (S19) is switched, thereby completing the injection and shifting to a holding pressure state in which a constant pressure is applied to the molding material. That is, the rotation speed of the motor 19 is kept constant, the descending speed of the ball screw 6 is kept constant, and injection is performed at a constant speed. However, during this injection,
As the mold cavity is filled with molding material, the pressure of the molding material increases, so to maintain a constant injection speed as described above, progressively more current is applied to the motor 19.
must be passed to. Therefore, in order to determine a constant current value, a detection means 42 is provided for detecting the current value flowing through a coil (not shown) of the motor 19, and the detection means 42 is inputted to a comparison means 44 for comparing it with a constant comparison value.

(2) The time when the holding pressure consumption current value reaches the comparison value is the completion of the injection stroke. Then, in response to the comparison signal from the comparison means 44, the constant current circuit 46 maintains the current supply to the motor 23 at a constant level, so that a constant pressure is applied to the resin material in the mold cavity.

The comparison signal from the comparison means 44 starts counting the pressure holding counter C2 that controls the pressure holding time (step E).
b19).

When the injection is completed as shown in FIG. 3(d), C is the hollow ball screw movement stroke and d is the injection stroke. In addition, 26 is a screw overrun detection sensor,
In normal operation, the injection is completed at a position above the sensor 26.

Next, when the pressure holding timer counts up (S20
), the motor 19 is stopped to complete pressure holding, and the cooling timer starts counting (step 521).

When the pressure retention is completed as described above, in preparation for the next metering and kneading, the motor 19 is rotated clockwise while keeping the injection clutch 17 in the ON state (step 522), and the hollow ball screw 6 is placed in the hollow ball screw standby state. The hollow ball screw standby position sensor 27 was pulled up until the position sensor 27 was turned ON (step 523). By the way, the motor 19 stopped, so in step 524) the hollow ball screw 6 was moved as shown in FIG. 3(e). and wait in that position. Also, at this time, the injection clutch 17 is turned off (
Step 525). In addition, in FIG. 3(e), e is the hollow ball screw movement stroke.

After going through the above steps, the metering clutch 16 is turned on again.
and the back pressure cylinder to 0NL (step Sl), and by repeating the above steps, kneading and measuring the molding material,
Back pressure, suck back and injection can be performed.

As shown in the above operation description, in the present invention, the hollow ball screw 6 is raised to the metering standby position and stopped, and the injection clutch 17 is disengaged, that is, the screw 2
Measuring and kneading are performed in a state completely disconnected from the drive source of the motor 19 that moves straight ahead. In other words, during metering and crosstalk, only the rotational driving force is applied to the screw 2,
Since the vertical direction is completely separated from the linear drive system (motor 19, ball screw 6, pole nut 9, etc.),
Only an upward thrust is generated in the vertical direction of the screw 2 due to the metering of the molding material, and the screw 2 rises as the metering progresses. At this time, the back pressure applied to the screw 2 in order to suppress measurement variations is determined only by the output of the back pressure cylinder 22, and the volume of the measured molding material is determined by the screw pressure applied to the screw 2, which is detected by the measurement completion detection sensor 25. It is determined by the travel path length of 2.

In this embodiment, photoelectric sensors are used for the sensors 24, 25, 26, and 27, but the switches may also be switched by using a microswitch and bringing the end of the stopper plate 7 into contact with the microswitch. good.

Note that the electric injection device to which the present invention is applied can be modified in various ways.

For example, in the above embodiment, the spline shaft 3 was provided at the rear end of the screw 2, and the hollow ball screw guide shaft 5 was provided at the rear end. It is also possible to provide a shaft and use a linear mechanism and a rotation mechanism in that order. In this case, the back pressure cylinder is provided to press the rear end of the spline shaft. In the above embodiment, the guide shaft 5 has a smaller diameter than the spline shaft 3, and the boundary between the guide shaft 5 and the spline shaft 3 is a locking portion below the hollow ball screw 6. In the case of a large diameter, the locking portion of the hollow ball screw is formed by providing a flange portion or the like having a diameter larger than the diameter of the hollow ball screw at the boundary portion.

Further, in the above embodiment, the rotating shaft of the rotating mechanism is a spline shaft, and the rotational driving force transmission mechanism timing pulley 14, timing belt 12, timing pulley 10, and spline nut 8 are used. However, the rotating shaft is a wide gear, and the input A configuration may be adopted in which a gear that meshes with the shaft 18 is attached to the input shaft 18, and the gear attached to the input shaft 18 slidably transmits rotational force to the wide gear.

Also, in the linear mechanism, instead of using the timing belt 13, a gear may be attached to the pole nut 9, and a gear that meshes with the pole nut 9 may be attached to the input shaft 18, and this may be used as a rotational driving force transmission mechanism in the linear mechanism.

Furthermore, although the above embodiment is configured to drive the rotating mechanism and the linear mechanism with one motor 19 and two clutches 16 and 17, the clutches are eliminated and one motor is provided for each of the rotating mechanism and the linear mechanism. An electric motor may also be used.

Furthermore, although the above embodiment is a vertical molding machine, the present invention can be easily applied to a horizontal molding machine.

〔Effect of the invention〕

As explained above, since metering is performed with the rotational drive system of the screw completely separated from the linear driving force of the screw by the clutch switching means, the back pressure applied to the screw is controlled by the back pressure applying means. The operation of each drive system can be accurately performed by switching control of the switching means.

[Brief explanation of the drawing]

FIG. 1(a) is a conceptual explanatory diagram of an electric injection device to which a measuring method according to an embodiment of the present invention is applied, FIG. 1(b) is a sectional view taken along line nn in FIG. 1(a), Figure 1 (C) is the first
2 is a perspective view of the rotating mechanism, linear mechanism, back pressure mechanism, clutch, and electric motor in FIG. 1; FIGS. 3 and 4 A-B are respectively FIG. 5 is a configuration diagram of a conventional hydraulic injection device, and FIG. 6 is a configuration diagram of a conventional electric injection device. 〃v 1... Food and heat cylinder 2... Screw 3... Spline shaft 3a... Spline shaft shoulder 5... Hollow ball screw guide shaft 6... Hollow ball screw 7... Stopper plate 8. ...Spline nut 9...Ball nut 10.11...Output side timing pulley 12.13
...Timing belt 14.15...Input side timing pulley 16.17
... Clutch 18 ... Input shaft 19 ... Electric motor 21 ... Injection unit base 22 ... Back pressure cylinder 23 ... Pressure regulator 24 ... Suckback completion detection sensor 25 ... Metering completion detection sensor 26...Screw overrun detection sensor 27...
... Hollow ball screw standby position sensor 30 ... Control device 33 ... Cylinder rod 43 ... Space 2 where melt molding material is accumulated

Claims (1)

[Claims] (1) A motor, a rotary motion transmitted means of the screw, a linear motion transmitted means of the screw, a back pressure applying means for applying back pressure to the screw, the rotary motion transmitted means and the linear motion transmitted means. An electric motor, comprising a clutch means for transmitting the driving force from the motor to the transmission means, and a switching operation of the clutch means is performed by a detection signal of a detection means for detecting a travel path of the linear motion transmitted means. type injection molding equipment.