JP2880677B2 - Electric injection molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric injection molding machine.

[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, filled into a cavity space of a mold, and cooled in the cavity space. After solidification, the mold is opened and the molded product is taken out.

The injection molding machine has a mold clamping device and an injection device, and the mold clamping device includes a fixed platen and a movable platen, and a mold clamping cylinder moves the movable platen forward and backward to move the mold toward and away from the mold. It has become. On the other hand, the injection device includes a heating cylinder for heating and melting the resin supplied from the hopper, and an injection nozzle for injecting the melted resin, and a screw is disposed in the heating cylinder so as to be able to move forward and backward. The resin can be injected by moving the screw forward, and can be measured by moving the screw backward.

Meanwhile, there has been provided an electric injection molding machine using an electric motor for moving the injection device forward and backward and for moving the screw forward and backward. FIG. 2 is a schematic view of an injection device in a conventional electric injection molding machine, and FIG. 3 is an enlarged view of a main part of the injection device in a conventional electric injection molding machine. In the figure, reference numeral 2 denotes an injection device, and 4 denotes an injection device frame. A heating cylinder 21 is fixed in front of the injection device frame 4 (to the left in the figure), and an injection nozzle 21a is arranged at the tip of the heating cylinder 21. Is established. And
A hopper 21b is provided in the heating cylinder 21, and a screw 20 is provided in the heating cylinder 21 so as to be able to advance and retreat and rotate freely, and the rear end of the screw 20 is rotatably supported by the support member 5. Is done.

[0005] A first servomotor 6 is attached to the support member 5, and the rotation of the first servomotor 6 is transmitted to the screw 20 via a timing belt 7a. The injection device frame 4 has 2
The guide bars 24 are provided, and the support members 5 are slidably supported by the respective guide bars 24. A ball screw shaft 8 is rotatably supported by the injection device frame 4 in parallel with a screw 20 via a bearing (not shown), and a rear end of the ball screw shaft 8 is connected to a timing belt 7b via a timing belt 7b. The ball screw shaft 8 can be rotated by driving the second servo motor 9 and connected to the second servo motor 9. The front end of the ball screw shaft 8 is
The ball nut 5a fixed to the rotation support plate 5b of the support member 5 is screwed.

Accordingly, by driving the second servomotor 9 and rotating the ball screw shaft 8 via the timing belt 7b, the ball nut 5a can be moved in the axial direction, and the screw 20 can be moved forward and backward.
Next, the operation of the injection device 2 having the above configuration will be described.
First, in the measuring step, the first servomotor 6 is driven, the screw 20 is rotated via the timing belt 7a, and the screw 20 is retracted to the predetermined position (moved rightward in the drawing). At this time, the resin supplied from the hopper 21b is heated and melted in the heating cylinder 21, and is stored (accumulated) in front of the screw 20 as the screw 20 retreats.

Next, in the injection step, the injection nozzle 21a is pressed against a mold (not shown), the second servomotor 9 is driven, and the ball screw shaft 8 is rotated via the timing belt 7b. At this time, the ball nut 5a and the rotation support plate 5b are moved with the rotation of the ball screw shaft 8 to advance the screw 20, so that the resin accumulated in front of the screw 20 is injected from the injection nozzle 21a. Is done.

In the injection step, the injection device 2
Is detected, and the pressure of the resin charged into the cavity space (not shown) is controlled based on the detected output. Therefore, usually, as shown in FIG.
A load meter 25 is disposed between the ball nut 5a and the rotation support plate 5b, a load applied to the ball nut 5a is detected by the load meter 25, and a firing force is detected based on the load. I have.

[0009]

However, in the injection device of the conventional electric injection molding machine, the load applied to the ball nut 5a is detected.
It is necessary to dispose the load meter 25 between the ball nut 5a and the rotation support plate 5b, which is not only troublesome for maintenance and management, but also increases the cost because the load meter 25 itself is expensive. .

The present invention can solve the problems of the conventional electric injection molding machine and can simplify maintenance and management.
It is an object of the present invention to provide an electric injection molding machine capable of reducing costs.

[0011]

For this purpose, in the electric injection molding machine according to the present invention, a heating cylinder, a screw disposed in the heating cylinder so as to be able to advance and retreat and rotate freely, and a rear portion of the heating cylinder are provided. A driving unit case connected to the driving unit case, an injection motor fixed to the driving unit case, and driven during an injection step, and connected between the injection motor and the screw to drive the injection motor. The rotational motion generated by the above is converted to linear motion, and the motion direction converting means for transmitting the linear motion to the screw, and fixed to the drive unit case, wherein the motion direction converting means converts the rotary motion to linear motion. A strain (strain) generating member that generates a strain when the strain is generated, and a strain gauge fixed to the strain generating member.

In another electric injection molding machine of the present invention,
Further, the injection motor includes a stator fixed to the drive unit case, and a rotor connected to the screw, the rotor being disposed on the same axis as the screw in the drive unit case, the rotor being a thrust bearing. Thus, it is rotatably supported by the drive unit case. Further, the distortion generating member includes a pressing portion that supports the thrust bearing.

[0013] In still another electric injection molding machine according to the present invention, the drive unit case further includes a first fixing plate disposed behind the heating cylinder, and a further rearward position of the first fixing plate. , And the injection motor is fixed to the second fixed plate. The distortion generating member includes a first bracket fixed to the first fixing plate and a second bracket fixed to the second fixing plate.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view of a main part of an electric injection molding machine according to a first embodiment of the present invention, FIG. 4 is a schematic diagram of the electric injection molding machine according to the first embodiment of the present invention, and FIG. It is a principal part side view of the electric injection molding machine in 1st Embodiment.

In FIG. 4, reference numeral 12 denotes a heating cylinder, and an injection nozzle 12a is provided at a front end (left end in the figure) of the heating cylinder 12. A screw 22 is provided in the heating cylinder 12 so as to be able to advance and retreat and rotate freely. The screw 22 has a screw head 22a at the front end, extends rearward (to the right in the drawing) in the heating cylinder 12, and is connected to the drive unit 31 at the rear end. A spiral flight 23 is formed around the screw 22, and a groove 2 is formed between the flights 23.
6 are formed.

A hopper (not shown) is provided at the rear of the heating cylinder 12 so that pellet resin can be supplied into the heating cylinder 12 from the hopper. Then, at the time of the weighing step, when the driving unit 31 is driven to retract while rotating the screw 22, the pellet-shaped resin in the hopper is
It falls, enters the heating cylinder 12, and is advanced in the groove 26.

A heater (not shown) is provided around the heating cylinder 12 so that the heating cylinder 12 can be heated by the heater and the resin in the groove 26 can be melted. Therefore, when the screw 22 is retracted to a predetermined position while rotating, one shot of the melted resin is accumulated in front of the screw head 22a.

Next, in the injection step, when the driving unit 31 is driven to advance the screw 22 without rotating, the resin stored in front of the screw head 22a is injected from the injection nozzle 12a. It is filled in a cavity space of a mold (not shown). Reference numeral 11 denotes a drive unit case surrounding the drive unit 31, and the drive unit case 11 is fixed to the rear of the heating cylinder 12. The drive unit case 11 includes a front support 14, a center support 15, a rear support 16, and the front support 1.
A front frame 41 connecting the center support 15 to the center support 15;
And a rear frame 42 connecting the two.

A metering motor 44 is provided on the front part of the drive unit case 11, and an injection motor 45 is provided on the same axis on the rear part. The metering motor 44 includes a stator 46 fixed to the front frame 41 and a rotor 47 disposed on the inner peripheral side of the stator 46, while the injection motor 45 is connected to the rear frame 42.
, And a rotor 49 arranged on the inner peripheral side of the stator 48.

The rotor 47 of the weighing motor 44 is rotatably supported by the drive unit case 11. To this end, a hollow first rotor shaft 56 is fitted and fixed to the rotor 47, and the first rotor shaft 56 is fixed.
The front end of the front support 14 is
The rear end of the center support 15
Respectively supported.

On the other hand, the rotor 49 of the injection motor 45
Is also rotatably supported by the drive unit case 11. Therefore, the hollow second rotor shaft 57 is attached to the rotor 49.
The front end of the second rotor shaft 57 is fixed to the center support 15 by a bearing 53, and the rear end of the second rotor shaft 57 is fixed to a bearing 54 through an annular connection flange 64.
Respectively supported by the rear support 16. The connecting flange 64 is connected to the second rotor shaft 57.
Fixed to the rear end.

By supplying a current having a predetermined frequency to the stator 46 of the metering motor 44, the screw 22 can be rotated backward while rotating. Therefore, the first rotor shaft 5
The first spline nut 62 is fixed to the front end of the first spline shaft 6, the first spline nut 62 and the first spline shaft 63 are spline-connected, and the screw 22 is fixed to the front end of the first spline shaft 63. In this case, the relative movement in the rotation direction is restricted by the first spline nut 62 and the first spline shaft 63, and the relative movement in the axial direction is allowed. The first spline shaft 63 has a length corresponding to the stroke of the screw 22.

Therefore, when the metering motor 44 is driven to rotate the rotor 47, the rotation of the rotor 47 is controlled by the first rotor shaft 56, the first spline nut 6
The rotation is transmitted to the screw 22 via the second and first spline shafts 63 and rotates the screw 22. The resin moves forward while the resin is melted in the groove 26, and the screw 2 is moved by the back pressure generated as the resin advances.
2 is retracted.

At this time, since the first spline nut 62 and the first spline shaft 63 are spline-connected, the first spline shaft 63 is relatively retracted with respect to the first spline nut 62. On the other hand, in the injection motor 45, the screw 22 can be advanced by supplying a current of a predetermined frequency to the stator 48. For this purpose, a connecting flange 64 is fixed to the rear end of the second rotor shaft 57, and a ball screw shaft 65 is fitted into the inner periphery of the connecting flange 64, and is stopped by a key 64a. The ball screw shaft 65 is rotatably supported by the drive unit case 11. That is, the ball screw shaft 65 is supported by the rear support 16 by the bearing 54 and the thrust bearing 66 via the connection flange 64, and by the angular bearing 67 disposed behind the thrust bearing 66. Reference numeral 16a denotes a bracket for rotatably supporting the angular bearing 67 with respect to the rear support 16.
Integrally or separately.

A ball nut 69 is provided inside the second rotor shaft 57 so as to be able to advance and retreat.
9 and the ball screw shaft 65 are screwed together to constitute a movement direction converting means. Therefore, the rotation of the rotor 49 is transmitted to the ball screw shaft 65 via the second rotor shaft 57 and the connection flange 64, and the rotational motion is converted into a linear motion, and the ball nut 69 moves forward and backward. At this time, a second spline shaft 71 is fixed to the front end of the ball nut 69 so that the ball nut 69 does not rotate together with the ball screw shaft 65, and a second spline nut 76 fixed to the center support 15. And the second spline shaft 71 are spline-connected. In this case, the relative movement in the rotation direction is restricted by the second spline nut 76 and the second spline shaft 71, and the relative movement in the axial direction is allowed. The second spline shaft 71 has a length corresponding to the stroke of the screw 22.

A bearing box 72 is fixed to the front end of the second spline shaft 71, and a thrust bearing 73 is provided in the bearing box 72 at the front.
A bearing 74 is provided rearward. In this case, the bearing box 72 restricts relative movement in the axial direction and allows relative movement in the rotation direction.
Therefore, the first spline shaft 63 is rotatably supported by the thrust bearing 73 and the bearing 74 with respect to the second spline shaft 71 and the ball nut 69.

Next, the operation of the driving unit 31 of the injection device having the above-described configuration will be described. First, in the injection step, when a current is supplied to the stator 48 of the injection motor 45, the rotor 49 is rotated, and the rotation of the rotor 49 is transmitted to the ball screw shaft 65 via the second rotor shaft 57 and the connection flange 64. Then, the ball screw shaft 65 is rotated. At this time, since the second spline nut 76 fixed to the center support 15 and the second spline shaft 71 are spline-connected, the ball nut 69 does not rotate. Therefore, a thrust is generated in the ball nut 69, and the ball nut 69 is advanced.

During this time, the metering motor 44 is not driven, and the rotor 47 is stopped. Therefore, the first spline shaft 63 disposed in front of the ball nut 69
Is advanced without rotating, the screw 2
Advance 2 In this manner, the rotational motion generated by the injection motor 45 is converted into a linear motion by the ball screw shaft 65 and the ball nut 69. As a result, the resin stored in front of the screw 22 can be injected from the injection nozzle 12a.

Next, in the measuring step, the measuring motor 4
When the current is supplied to the stator 46 of the fourth spline, the rotor 47 is rotated, and the rotation of the rotor 47 is transmitted to the first spline shaft 63 via the first rotor shaft 56 and the first spline nut 62, and the first spline The shaft 63 is rotated. Then, the rotation of the first spline shaft 63 is transmitted to the screw 22, and the screw 22 is rotated. Along with this, the resin advances in the groove 26 while being melted, and the screw 22 is retracted by the back pressure generated as the resin advances.

At this time, since the first spline nut 62 and the first spline shaft 63 are spline-connected, the first spline shaft 63 is relatively retracted with respect to the first spline nut 62. As described above, since there is no need to use the timing belt to move the screw 22 forward or backward, or rotate the screw 22, no noise is generated at the time of driving, maintenance and management are easy, and speed, position, etc. Control accuracy can be improved.

By the way, in the injection step, the screw 22 is pushed by the resin stored in front of the screw head 22a.
Receives a reaction force corresponding to the load. The reaction force is received by the thrust bearing 66 from the ball screw shaft 65 via the connection flange 64. Therefore, the reaction force received by the thrust bearing 66, that is, the thrust force can be detected as the firing force. Therefore, as shown in FIGS. 1 and 5, an annular strain plate 77 as a strain generating member is fixed to the rear end surface of the rear support 16 by bolts 79.

An annular pressing portion 80 protruding forward is formed on the inner peripheral edge of the front end face of the strain plate 77, and when the strain plate 77 is fixed to the rear end face of the rear support 16. Then, the pressing portion 80 is pressed against the ring 81. Therefore, the strain plate 77 not only generates the strain by further receiving the thrust force received by the thrust bearing 66, but also supports the thrust bearing 66 as a support member and positions the thrust bearing 66. Then, a strain gauge 82 is fixed to a predetermined location on the end face of the strain plate 77, and the strain gauge 82 can detect the strain and further detect the radiation output. In addition, 65a is a screw part, 83 is a bearing nut.

Next, the operation of the strain gauge 82 will be described. FIG. 6 is a first diagram illustrating the operation of the strain gauge according to the first embodiment of the present invention, and FIG. 7 is a second diagram illustrating the operation of the strain meter according to the first embodiment of the present invention. In the figure,
16 is a rear support, 77 is a strain plate, and 79 is a bolt. The strain plate 77 is fixed to the rear support 16 by bolts 79 only in the vicinity of the outer peripheral edge.
2 is fixed near the inner peripheral edge of the strain plate 77.

In this case, when the strain plate 77 receives a thrust force F from the thrust bearing 66 (FIG. 1), a strain is generated as shown by a broken line, and the strain is generated by the strain plate 7.
7 is closer to the inner peripheral edge. Therefore, strain gauge 8
2 is arranged near the inner peripheral edge of the strain plate 77. The strain gauge 82 receives a tensile force in the direction of arrow G by the strain generated in the strain plate 77, and generates a voltage calibrated corresponding to the strain. Therefore, by sending a signal of the calibrated voltage to a control device (not shown) and converting the signal into a radiation output, not only can the radiation output be accurately detected,
The injection device can be feedback-controlled by the injection power. Since the strain gauge 82 itself is low in price,
The cost of the electric injection molding machine can be reduced.

Then, the thrust force F is not directly received by the strain gauge 82, and the strain plate 77 is fixed to the rear end face of the rear support 16, and the strain plate 7
Since the strain gauge 82 is attached to the base 7, the work of attaching the strain gauge 82, the wiring process, and the like are facilitated, so that not only the assemblability can be improved, but also the maintenance and management can be simplified. .

Further, not only the radiation output can be detected by the distortion generated in the distortion plate 77, but also
Since the thrust bearing 66 can be supported by the strain plate 77, the ball nut 69 (FIG. 4) can be stably supported, and the positional accuracy of the screw 22 can be increased. In general, it is necessary to apply a preload to the thrust bearing 66 and the angular bearing 67. To this end, a screw portion 65a is formed at the rear end of the ball screw shaft 65,
A preload is applied to the thrust bearing 66 and the angular bearing 67 by tightening the bearing nut 83 to a at a predetermined torque.

However, in this case, since the thrust bearing 66 and the strain plate 77 are in contact with each other, a preload is also applied to the strain plate 77, and the zero point of the strain gauge 82 is shifted. Therefore, the control device performs calibration in the pressure control during the injection process, and resets the zero point.

Next, a second embodiment of the present invention will be described. FIG. 8 is a first diagram illustrating the operation of the strain gauge according to the second embodiment of the present invention, and FIG. 9 is a second diagram illustrating the operation of the strain meter according to the second embodiment of the present invention. In the drawing, 101 is a rod connected to the rear end of a screw (not shown), 102 and 103 are fixed to an injection device frame (not shown) behind a heating cylinder (not shown), and are disposed facing each other at a distance from each other, The first and second fixing plates 104 constituting the driving unit case are guide bars erected between the first and second fixing plates 102 and 103, and 105 is fixed to the rear end of the rod 101. It is a slide plate slidably provided along the guide bar 104.

Reference numeral 107 denotes a ball screw shaft having a rear end fixed to the second fixing plate 103, and reference numeral 108 denotes a ball nut screwed with the ball screw shaft 107. The movement direction changing means is constituted by the nut 108 and the ball screw shaft 10.
7 is converted into a linear motion of the ball nut 108.

An injection motor 109 is fixed to the second fixing plate 103 and connected to one end of the ball screw shaft 107. Therefore, in the injection step, when the ball screw shaft 107 is rotated by driving the injection motor 109, the ball nut 108 and the slide plate 105 are advanced. As a result, the screw is advanced through the rod 101.

Incidentally, the first fixing plate 102
The first bracket 112 is attached to the second fixing plate 10.
3 are provided with second brackets 113, respectively, and the first bracket 112 and the second bracket 113 constitute a strain generating member. A strain gauge 114 is installed between the first and second brackets 112 and 113. In this case, in the injection process, the ball nut 10
8 moves forward, the second fixing plate 103 tries to retreat, so that the second bracket 113 tries to move away from the first bracket 112, and the first bracket 112 and the second bracket 113 Is generated in the direction of arrow H, and the strain gauge 114 generates a voltage calibrated corresponding to the strain. Therefore, by sending a signal of the calibrated voltage to a control device (not shown) and converting the signal to an emission power, not only the emission power can be accurately detected, but also the feedback control of the injection device by the emission power. can do. In addition, strain meter 1
Since the price of the motor 14 itself is low, the cost of the electric injection molding machine can be reduced.

The thrust force is no longer directly received by the strain gauge 114, and the first and second brackets 112 and 113 are fixed to the first and second fixing plates 102 and 103, respectively. Since the strain gauge 114 is mounted between the second brackets 112 and 113, the work of mounting the strain gauge 114, the wiring process, and the like are facilitated, so that not only can the assemblability be improved, but also maintenance and maintenance can be performed. Management can be simplified.

It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified based on the gist of the present invention, and they are not excluded from the scope of the present invention.

[0044]

As described above in detail, according to the present invention, in an electric injection molding machine, a heating cylinder, a screw disposed in the heating cylinder so as to be able to advance and retreat and rotate freely, and A drive unit case connected to the rear of the heating cylinder, an injection motor fixed to the drive unit case and driven during an injection process, and an injection motor connected between the injection motor and the screw; The rotary motion generated by driving the motor is converted into a linear motion, the motion direction converting means for transmitting the linear motion to the screw, and fixed to the drive unit case, the motion direction converting means converts the rotary motion. It has a distortion generating member that generates distortion when converted to linear motion, and a strain gauge fixed to the distortion generating member.

In this case, when the injection motor is driven, the rotation direction is converted by the movement direction converting means into a linear movement, and the linear movement is transmitted to the screw. As a result, the screw is advanced and injection is performed. At this time, since the strain is generated in the strain generating member fixed to the drive unit case, the emission power of the injection device can be detected by the strain gauge fixed to the strain generating member.

Further, since the thrust force is not directly received by the strain gauge, the strain generating member is fixed to the drive section case, and the strain gauge is attached to the strain generating member. Work, wiring processing, and the like are facilitated, and not only can assemblability be improved, but also maintenance and management can be simplified. Further, since the strain gauge itself is low in cost, the cost of the electric injection molding machine can be reduced.

In another electric injection molding machine of the present invention,
Further, the injection motor includes a stator fixed to the drive unit case, and a rotor connected to the screw, the rotor being disposed on the same axis as the screw in the drive unit case, the rotor being a thrust bearing. Thus, it is rotatably supported by the drive unit case. Further, the distortion generating member includes a pressing portion that supports the thrust bearing.

In this case, since the strain generating member pushes and supports the thrust bearing, the movement direction changing means can be stably supported, and the positional accuracy of the screw can be increased. In still another electric injection molding machine of the present invention, the drive unit case is further provided with a first fixed plate disposed behind the heating cylinder, and further disposed behind the first fixed plate. The injection motor is fixed to the second fixed plate.

The distortion generating member includes a first bracket fixed to the first fixing plate, and a second bracket fixed to the first fixing plate.
And a second bracket fixed to the fixing plate of the second bracket. In this case, since the thrust force is not directly received by the strain gauge, the strain generating member is fixed to the first fixing plate, and the strain gauge is attached to the strain generating member. Work, wiring processing, and the like are facilitated, and not only can assemblability be improved, but also maintenance and management can be simplified.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of an electric injection molding machine according to a first embodiment of the present invention.

FIG. 2 is a schematic view of an injection device in a conventional electric injection molding machine.

FIG. 3 is an enlarged view of a main part of an injection device in a conventional electric injection molding machine.

FIG. 4 is a schematic view of the electric injection molding machine according to the first embodiment of the present invention.

FIG. 5 is a side view of a main part of the electric injection molding machine according to the first embodiment of the present invention.

FIG. 6 is a first diagram showing an operation of the strain gauge according to the first embodiment of the present invention.

FIG. 7 is a second diagram illustrating the operation of the strain gauge according to the first embodiment of the present invention.

FIG. 8 is a first diagram illustrating an operation of a strain gauge according to the second embodiment of the present invention.

FIG. 9 is a second diagram illustrating the operation of the strain gauge according to the second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Drive part case 12 Heating cylinder 22 Screw 45,109 Injection motor 48 Stator 49 Rotor 65,107 Ball screw shaft 66 Thrust bearing 69,108 Ball nut 77 Strain plate 80 Pressing part 82 Strain meter 102 First fixing plate 103 Second fixing plate 112 First bracket 113 Second bracket

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-197595 (JP, A) JP-A-9-174625 (JP, A) JP-A-61-266218 (JP, A) JP-A-61-266218 266219 (JP, A) JP-A-62-97818 (JP, A) JP-A-5-345337 (JP, A) JP-A-4-77226 (JP, A) (58) Fields investigated (Int. ⁶ , DB name) B29C 45/17 B29C 45/46-45/52 B29C 45/57-45/58 B29C 45/76-45/77

Claims (3)

(57) [Claims] (A) a heating cylinder; (b) a screw disposed in the heating cylinder so as to advance and retreat and rotate freely; and (c) a driving unit case connected to the rear of the heating cylinder. (D) an injection motor fixed to the drive unit case and driven during the injection process; and (e) connected between the injection motor and the screw and generated by driving the injection motor. A direction-of-motion converting means for converting the rotated motion into a linear motion and transmitting the linear motion to the screw; and (f) fixed to the drive unit case, wherein the motion-direction converting means converts the rotary motion into a linear motion. An electric injection molding machine comprising: a strain generating member that generates a strain when converted; and (g) a strain gauge fixed to the strain generating member. 2. (a) The injection motor includes a stator fixed to the drive unit case and disposed on the same axis as the screw in the drive unit case, and a rotor connected to the screw. (B) The rotor is rotatably supported by a drive unit case by a thrust bearing, and (c) the distortion generating member includes a pressing portion that supports the thrust bearing.
3. The electric injection molding machine according to 1. 3. A drive unit case comprising: a first fixed plate disposed behind the heating cylinder; and a second fixed plate disposed further behind the first fixed plate. (B) the injection motor is the second motor
(C) the strain generating member is
The electric injection molding machine according to claim 1, comprising a first bracket fixed to the first fixing plate, and a second bracket fixed to the second fixing plate.