JP4254917B2 - Injection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an injection apparatus.
[0002]
[Prior art]
Conventionally, in an injection molding machine, a resin as a molding material heated and melted in a heating cylinder of an injection apparatus is injected and filled into a cavity space in a mold apparatus. A molded product can be obtained by cooling and solidifying.
[0003]
The injection molding machine has a mold device, a mold clamping device, and an injection device. The mold apparatus includes a fixed mold and a movable mold, and the mold closing, mold clamping, and mold opening are performed by moving the movable mold forward and backward by the mold clamping apparatus. The injection device includes an in-line injection device and a pre-plastic injection device. In the case of an in-line type injection device, a heating cylinder and a screw that is rotatably and reciprocally arranged in the heating cylinder are provided, and metering and injection are performed by a single screw. In addition, in the case of a pre-plastic injection device, a heating cylinder, a screw arranged rotatably in the heating cylinder, a pressure cylinder arranged in communication with the heating cylinder, and advancing and retreating in the pressure cylinder A freely disposed plunger is provided, and metering is performed by the screw and injection is performed by the plunger.
[0004]
[Problems to be solved by the invention]
However, in the conventional injection device, in the case of the in-line type injection device, the metering and the injection are performed by one screw, so that the screw having a predetermined length is moved by a predetermined stroke in order to perform the measurement. It is necessary to let Therefore, the axial dimension of the injection device is increased.
[0005]
In addition, when the screw is rotated in the weighing process and the screw is retracted accordingly, the pressure of the resin is detected by a pressure sensor disposed at the rear end of the screw, and the back pressure is adjusted in accordance with the detected pressure. Although the pressure is adjusted, if the resin bites between the inner peripheral surface of the heating cylinder and the outer peripheral surface of the screw, the detected pressure varies. Therefore, the weighing cannot be performed accurately.
[0006]
Furthermore, when a resin is injected, a backflow prevention device is required so that the resin does not flow backward, so that the shape of the front end of the screw is complicated, and the structure of the injection device is not only complicated. The pressure resistance performance of the device is lowered and the durability is lowered.
[0007]
And since it is necessary to make a screw into the shape which can measure resin, there exists a limit in reducing the diameter of a screw. Therefore, the ratio between the amount of resin to be injected and the amount of resin to be weighed cannot be greatly varied, and not only the maintenance and manageability deteriorate, but also variations in molded products are limited. .
[0008]
On the other hand, in the case of a pre-plastic type injection device, since the heating cylinder and the pressure cylinder are arranged in parallel, the dimension in the width direction or height direction of the injection device becomes large.
[0009]
Also, since the resin passes through the pressure cylinder after passing through the heating cylinder, the residence time of the resin becomes longer, causing the resin to burn, and making it difficult to replace the resin. Will fall.
[0010]
And since it is necessary to arrange | position many heaters for heating resin, the structure of an injection device will become complicated.
[0011]
The present invention solves the problems of the conventional injection apparatus, can reduce not only the axial direction but also the width and height dimensions, simplify the structure, and maintain and manage the apparatus. It is an object of the present invention to provide an injection device that can improve the performance, can accurately measure the weight, and can improve the durability.
[0012]
[Means for Solving the Problems]
For this purpose, in the injection device of the present invention, the metering drive unit and the drive device main body that supports the injection drive unit are provided on the frame, and are attached to the main body unit. A cylinder member that is relatively movably disposed via a biasing member and has a blocked portion formed on the inner periphery of the front end, an injection nozzle attached to the front end of the cylinder member, and a plasticizing movement A plasticizing movement device for moving the main body on the frame, and a drive unit, and the cylinder member is disposed within the cylinder member so as to be rotatable and movable back and forth with respect to the main body. A cylindrical member that is disposed so as not to advance and retract and has a blocking portion formed at the front end portion thereof, and an injection member that is disposed so as to freely advance and retract within the cylindrical member.
[0013]
Then, in the weighing step, the plasticizing movement driving unit is driven, and the main body unit is retracted in a state where the injection nozzle is in contact with the fixed mold. A gap is formed between the portion to be cut off, the metering drive unit is driven, and the molding material is metered by the cylindrical member.
Further, in the injection step, the driving unit for plasticizing movement is driven, and the main body is advanced in a state where the injection nozzle is in contact with a fixed mold, The cut-off portion is brought into contact, the injection driving portion is driven, and the molding material is injected by the injection member.
[0014]
In another injection device of the present invention, the cylinder member is disposed so as to be movable forward and backward with respect to the main body portion, and is advanced with respect to the main body portion in the measuring step, and is moved relative to the main body portion in the injection step. It is made to retreat.
[0015]
In still another injection device of the present invention, the cylindrical member is a screw that is rotatably disposed and advances the molding material as it rotates.
[0016]
In still another injection device of the present invention, the injection member is a plunger that is disposed so as to freely advance and retract and injects a molding material as it advances.
[0017]
In still another injection device according to the present invention, in the injection step, the blocking portion is fitted into the blocked portion with contact.
[0018]
In still another injection device of the present invention, in the injection step, the blocking portion is brought into contact with the blocked portion in accordance with the contact.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0020]
FIG. 1 is a conceptual diagram of an injection molding machine according to the first embodiment of the present invention, and FIG. 2 is a diagram for explaining an injection process according to the first embodiment of the present invention.
[0021]
In the figure, 11 is a frame, 12 is a stationary platen fixed to the frame 11, and 13 is a stationary mold attached to the stationary platen 12. A movable platen (not shown) is movably disposed so as to face the fixed platen 12, and a movable mold is attached to the movable platen. A mold apparatus is constituted by the fixed mold 13 and the movable mold, and a mold clamping apparatus is constituted by the fixed platen 12, the movable platen, and a mold clamping mechanism such as a toggle mechanism (not shown). By closing and moving the movable platen by the mold clamping device and by moving the movable mold back and forth, mold closing, mold clamping and mold opening are performed.
[0022]
An injection device 14 as a plasticizing device is disposed on the frame 11 so as to be able to advance and retract in the direction of arrow A. The injection device 14 moves forward and backward with respect to the main body 15 via a spring 16 as a biasing member at the front end (left end in FIG. 1) of the main body 15 (moving in the left-right direction in FIG. 1). ) A heating cylinder 18 as a freely arranged cylinder member, a cylindrical member disposed in the heating cylinder 18 so as to be rotatable with respect to the heating cylinder 10, and a screw as a measuring member. 19 and a plunger 21 serving as an injection member disposed in the screw 19 so as to be movable forward and backward in the direction of arrow B. The heating cylinder 18 is disposed so as to be movable back and forth with respect to the main body 15, and the screw 19 is disposed so as not to be able to advance and retract relative to the main body 15, so that the screw 19 is rotatable relative to the heating cylinder 18, and Therefore, it is arranged so as to freely advance and retract.
[0023]
A guide g projects from the main body 15 toward the front (left side in FIG. 1), and the guide g slides on the flange 18a at the rear end (right end in FIG. 1) of the heating cylinder 18. It can be penetrated freely. The spring 16 surrounds the guide g and urges the heating cylinder 18 forward by a predetermined urging force. The heating cylinder 18 can be moved back and forth with respect to the main body 15 by using an air cylinder instead of the spring 16 and driving the air cylinder.
[0024]
An injection nozzle 26 is attached to the front end of the heating cylinder 18, a nozzle port 27 is formed at the front end of the injection nozzle 26, and a hopper 23 is arranged at the rear end (right end in FIG. 1) of the heating cylinder 18. A resin (not shown) as a molding material is accommodated in the hopper 23. A heater (not shown) as a heating member is disposed on the outer periphery of the heating cylinder 18 and the injection nozzle 26. The screw 19 includes a main body 10, and a spiral flight 31 is formed on the outer periphery of the main body 10, and a spiral groove 32 is formed along the flight 31.
[0025]
An insertion portion P1 as a blocking portion is formed on the outer periphery of the front end portion (left end portion in FIG. 1) of the screw 19 so that the insertion portion P1 is inserted into the inner periphery of the front end portion of the heating cylinder 18. The insertion part P2 as a to-be-shielded part is formed. The inner diameter of the insertion portion P2 is slightly larger than the outer diameter of the insertion portion P1, and the inner diameter of the portion behind (to the right in FIG. 1) the insertion portion P2 is the outer diameter of the flight 31. Made slightly larger.
[0026]
In addition, a plasticizing moving device 20 is disposed to move the injection device 14 and the main body 15. The plasticizing moving device 20 is fixed to the frame 11 and is engaged with a motor 51 as a driving unit for plasticizing movement, a driving gear 52 fixed to an output shaft of the motor 51, and the driving gear 52. A driven gear 53 to be driven, a ball screw shaft 54 fixed to the driven gear 53, and a ball nut 55 screwed to the ball screw shaft 54 and fixed to the main body portion 15. The ball screw shaft 54 and the ball nut 55 constitute a ball screw as a first motion direction converting portion that converts a rotational motion into a straight motion, and the ball screw shaft 54 serves as a first conversion element as a ball screw. The nut 55 constitutes a second conversion element.
[0027]
When the motor 51 is driven in the forward direction with the spring 16 fully extended, the entire injection device 14 is first moved forward (moved to the left in FIG. 1), and the front end of the injection nozzle 26 is moved. When abutting against the fixed mold 13, the heating cylinder 18 is stopped. Thereafter, the main body 15 is advanced against the urging force of the spring 16, and the spring 16 is contracted accordingly. Further, when the motor 51 is driven in the reverse direction with the spring 16 contracted, first, the main body portion 15 is retracted (moved to the right in FIG. 1) by the urging force of the spring 16, and accordingly, The spring 16 is extended. Subsequently, when the spring 16 is fully extended, the entire injection device 14 is retracted, and the front end of the injection nozzle 26 is separated from the fixed mold 13.
[0028]
The main body 15 includes a metering motor 22 as a first drive for rotating the screw 19 and an injection motor 24 as a second drive for moving the plunger 21 back and forth.
[0029]
A drive gear 33 is fixed to the output shaft of the metering motor 22, the drive gear 33 and the intermediate gear 34 are engaged with each other, and a follower formed at the rear end of the intermediate gear 34 and the screw 19. The gear 36 is meshed. The rotation generated by driving the metering motor 22 is transmitted to the screw 19 through the drive gear 33, the intermediate gear 34 and the driven gear 36. In this case, the measuring motor 22 is arranged with the output shaft protruding forward, and when the measuring motor 22 is driven in the forward direction, the screw 19 is rotated in the forward direction (counterclockwise) When driven in the reverse direction, the screw 19 is rotated in the reverse direction (clockwise). The drive gear 33, the intermediate gear 34, and the driven gear 36 constitute a first rotation transmission system.
[0030]
In addition, a drive gear 37 is fixed to the output shaft of the injection motor 24, the drive gear 37 and the intermediate gear 38 are meshed, and a spline formed at the rear end of the intermediate gear 38 and the plunger 21. 39 is meshed. The drive gear 37, the intermediate gear 38 and the spline 39 constitute a second rotation transmission system.
[0031]
Then, the spline 39 and the ball screw shaft 41 are integrally connected, and the ball screw shaft 41 and the ball nut 42 fixed to the main body portion 15 are screwed together. The ball screw shaft 41 and the ball nut 42 constitute a ball screw as a second motion direction converting portion that converts a rotational motion into a linear motion with rotation, that is, a rotational linear motion, and the ball screw shaft 41 The first conversion element and the ball nut 42 constitute a second conversion element. A roller screw can be used in place of the ball screw.
[0032]
Accordingly, the rotation generated by driving the injection motor 24 is transmitted to the spline 39 via the drive gear 37 and the intermediate gear 38, and the rotation of the spline 39 is transmitted to the ball screw shaft 41. . As a result, the ball screw shaft 41 is advanced and retracted, and accordingly, the plunger 21 is advanced and retracted while rotating. In this case, the injection motor 24 is disposed with the output shaft protruding rearward. When the injection motor 24 is driven in the forward direction, the ball screw shaft 41 is also rotated in the forward direction (counterclockwise). Then, the ball screw shaft 41 and the plunger 21 are advanced. On the other hand, when the injection motor 24 is driven in the reverse direction, the ball screw shaft 41 is also rotated in the reverse direction (clockwise), and the ball screw shaft 41 and the plunger 21 are retracted. In this case, the metering motor 22 is disposed with the output shaft projecting forward, and the injection motor 24 is disposed with the output shaft projecting rearward. The axial dimension can be reduced.
[0033]
In addition, by disposing a thrust bearing (not shown) between the ball screw shaft 41 and the plunger 21, the rotational movement of the ball screw shaft 41 may be converted into the linear movement without the rotation of the plunger 21. it can.
[0034]
In addition, a pressure sensor 45 as a pressure detection unit is disposed at the rear end of the spline 39. The pressure sensor 45 includes a load cell, and measures the pressure of the resin accumulated in the front of the plunger 21. Detect and send a detection signal to a control unit (not shown). Instead of the pressure sensor 45, a pressure sensor that is disposed in the injection nozzle 26 and detects the pressure of the resin in the nozzle port 27 may be used.
[0035]
Next, the operation of the injection apparatus 14 having the above-described configuration will be described. In this case, a molding method in which the front end of the injection nozzle 26 is always brought into contact with the fixed mold 13 will be described.
[0036]
First, when the weighing process is started, the weighing processing unit of the control unit drives the motor 51 in the reverse direction to move the main body unit 15 backward before performing the weighing process. At this time, the heating cylinder 18 is advanced with respect to the main body portion 15 by the urging force of the spring 16, and the front end of the injection nozzle 26 is kept in contact with the fixed mold 13. Further, as the main body portion 15 is retracted, the screw 19 is retracted with respect to the heating cylinder 18, and the insertion portion P1 is extracted from the insertion portion P2. A predetermined gap is formed between the front end of the insertion portion P1 and the rear end of the insertion portion P2 in a state where the front end of the injection nozzle 26 is in contact with the fixed mold 13, and the insertion portion P1 and the plunger When the front side from 21 and the rear side from the fitting portion P <b> 1 are communicated, the weighing processing means stops driving the motor 51 and stops the main body part 15.
[0037]
Subsequently, the weighing processing means drives the weighing motor 22 in the forward direction to rotate the screw 19 in the forward direction. Along with this, the resin in the hopper 23 enters the heating cylinder 18 and is advanced in the groove 32, while being heated and melted by the heater. The resin is stored in front of the screw 19 in the heating cylinder 18 and is stored in front of the plunger 21 in the screw 19.
[0038]
At this time, since the pressure of the resin accumulated in front of the plunger 21 is applied to the pressure sensor 45 via the plunger 21, the ball screw shaft 41 and the spline 39, the measurement processing means detects the pressure by the pressure sensor 45. The injection motor 24 is driven in the reverse direction so that the pressure becomes a set value. Accordingly, the ball screw shaft 41 is rotated in the reverse direction, and the plunger 21 is moved backward while applying a predetermined back pressure to the plunger 21. When the plunger 21 reaches a preset measurement end position, the measurement processing means stops the measurement motor 22 and stops the rotation of the screw 19 and stops the injection motor 24. And the plunger 21 is stopped.
[0039]
Next, when the injection process is started, the injection processing means of the control unit performs an injection process, drives the motor 51 in the forward direction, and advances the main body unit 15. At this time, the heating cylinder 18 is retracted against the main body 15 against the urging force of the spring 16, and the front end of the injection nozzle 26 is kept in contact with the stationary mold 13. Further, as the main body portion 15 advances, the screw 19 is advanced, and the insertion portion P1 is inserted into the insertion portion P2, as shown in FIG. Then, with the front end of the injection nozzle 26 in contact with the fixed mold 13, the gap formed between the front end of the insertion portion P1 and the rear end of the insertion portion P2 disappears, and the insertion portion P1 and When the front side from the plunger 21 and the rear side from the fitting part P1 are blocked, the injection processing means stops the driving of the motor 51 and stops the main body part 15.
[0040]
At this time, the resin is pushed away as much as the insertion portion P1 is inserted into the insertion portion P2, and accordingly, the injection processing means controls the pressure of the resin so that the pressure of the resin does not increase. Detect and adjust by.
[0041]
Subsequently, when the injection motor 24 drives the injection motor 24 in the forward direction, the ball screw shaft 41 is rotated in the forward direction and the plunger 21 is advanced. When the plunger 21 reaches a preset injection end position, the injection processing means stops driving the injection motor 24 and stops the plunger 21. Meanwhile, the resin stored in front of the fitting portion P1 and the resin stored in front of the plunger 21 are injected by the injection nozzle 26 and filled in a cavity space (not shown) in the mold apparatus.
[0042]
Thus, when injection is performed, a pressure holding process is started, and the pressure holding processing means of the control unit performs pressure holding processing so that the pressure detected by the pressure sensor 45 becomes a constant value. The injection motor 24 is continuously driven. Subsequently, the mold apparatus is cooled, and the resin in the cavity space is cooled and solidified to form a molded product.
[0043]
Thus, since the plunger 21 is disposed in the screw 19 so as to be able to advance and retract, and the screw 19 and the plunger 21 are overlapped, the dimensions of the injection device in the axial direction, the width direction, or the height direction can be reduced. Not only can the gas generated in the metering step be released from the rear part of the plunger 21 (right part in FIG. 1).
[0044]
Further, since the rotation of the screw 19 and the retraction of the plunger 21 are performed independently, when the screw 19 is rotated and the resin is moved forward in the measuring step, the inner peripheral surface of the heating cylinder 18 and the outer periphery of the screw 19 are moved. Even if the resin bites into the surface, the resin pressure detected by the pressure sensor 45 does not vary. Accordingly, the back pressure can be adjusted in accordance with the detected pressure, so that the weighing can be performed accurately.
[0045]
In the injection process, the insertion part P1 is inserted into the insertion part P2, and the front part from the insertion part P1 and the plunger 21 and the rear part from the insertion part P1 are blocked. Does not flow backwards. Therefore, since it is not necessary to provide a backflow prevention device, the shape of the front end portion of the screw 19 can be simplified, and the structure of the injection device can be simplified. In addition, the pressure resistance performance of the injection device can be increased, and the durability can be improved.
[0046]
Furthermore, there is no limit to reducing the diameter of the plunger 21 because it is not necessary to make the plunger 21 in a shape that can measure the resin. Accordingly, the ratio between the amount of resin injected by the plunger 21 and the amount of resin measured by the screw 19 can be greatly varied, improving maintenance and manageability, and various molding variations. Can be realized.
[0047]
In addition, since the metering and injection can be performed in the heating cylinder 18, the residence time of the resin is shortened, and it is possible to prevent the resin from being burnt or making it difficult to replace the resin. Manageability can be improved.
[0048]
And since it is not necessary to arrange many heaters for heating resin, the structure of an injection device can be simplified.
[0049]
In the present embodiment, the molding method in which the front end of the injection nozzle 26 is always brought into contact with the fixed mold 13 has been described. However, in the molding method in which the injection nozzle 26 is separated from the fixed mold 13, the measuring step Is started, the measurement processing means drives the motor 51 in the reverse direction before performing the measurement process, and retracts the main body 15 until the front end of the injection nozzle 26 is separated from the fixed mold 13. Next, the drive of the motor 51 is stopped, and the main-body part 15 is stopped. At this time, a gap is formed between the front end of the insertion portion P1 and the rear end of the insertion portion P2, and the front side from the insertion portion P1 and the plunger 21 and the rear side from the insertion portion P1 are communicated. Subsequently, the weighing processing means drives the weighing motor 22 in the forward direction to perform a weighing process.
[0050]
Next, a second embodiment of the present invention will be described.
[0051]
FIG. 3 is a cross-sectional view of the front end portion of the injection apparatus according to the second embodiment of the present invention.
[0052]
As shown in the drawing, the abutting portion P3 as a blocking portion having a tapered surface at the front end (left end in the drawing) of the screw 19 as the cylindrical member and the measuring member is behind the injection nozzle 26 (right in the drawing). In addition, a contacted portion as a blocked portion including a tapered surface corresponding to the tapered surface of the contact portion P3 is provided on the inner periphery in the vicinity of the front end portion (left end portion in the drawing) of the heating cylinder 18 as a cylinder member. A portion P4 is formed, and the contact portion P3 is brought into contact with the contacted portion P4 in the injection process, thereby causing the contact portion P3 and the plunger 21 as the injection member to be in front and behind the contact portion P3. Is cut off. A resin reservoir 61 having an inner diameter larger than the inner diameter of the nozzle port 27 is formed between the injection nozzle 26 and the contacted portion P4. Further, the inner diameter of the resin reservoir 61 is preferably formed larger than the outer diameter of the plunger 21.
[0053]
Next, a third embodiment of the present invention will be described.
[0054]
FIG. 4 is a cross-sectional view of the front end portion of the injection apparatus according to the third embodiment of the present invention.
[0055]
As shown in the drawing, the abutting portion P5 as a blocking portion formed of a vertical surface at the front end (left end in the drawing) of the screw 19 as the cylindrical member and the measuring member is behind (rightward in the drawing) from the injection nozzle 26. In addition, on the inner periphery in the vicinity of the front end portion (the left end portion in the drawing) of the heating cylinder 18 as a cylinder member, the contacted portion as a blocked portion formed of a vertical surface corresponding to the vertical surface of the contact portion P5 A part P6 is formed, and the contact part P5 is brought into contact with the contacted part P6 in the injection process, thereby causing the contact part P5 and the plunger 21 as the injection member to be in front and behind the contact part P5. Is blocked. Reference numeral 27 denotes a nozzle port, and 61 denotes a resin reservoir.
[0056]
In addition, this invention is not limited to the said embodiment, It can change variously based on the meaning of this invention, and does not exclude them from the scope of the present invention.
[0057]
【The invention's effect】
As described above in detail, according to the present invention, in the injection device, the metering drive unit disposed on the frame so as to freely move back and forth, and the drive device main body unit supporting the injection drive unit, A cylinder member which is arranged to be movable relative to the main body part via a biasing member, and has a blocked part formed on the inner periphery of the front end part, and an injection attached to the front end of the cylinder member A nozzle, a plasticizing movement drive unit, a plasticizing movement device for moving the main body unit on the frame, and a cylinder member that is rotatable with respect to the cylinder member and can be moved back and forth within the cylinder member A cylindrical member that is disposed so as not to advance and retreat relative to the main body and has a blocking portion formed at a front end portion; and an injection member that is disposed so as to be movable back and forth within the cylindrical member.
[0058]
Then, in the weighing step, the plasticizing movement driving unit is driven, and the main body unit is retracted in a state where the injection nozzle is in contact with the fixed mold. A gap is formed between the portion to be cut off, the metering drive unit is driven, and the molding material is metered by the cylindrical member.
Further, in the injection step, the driving unit for plasticizing movement is driven, and the main body is advanced in a state where the injection nozzle is in contact with a fixed mold, The cut-off portion is brought into contact, the injection driving portion is driven, and the molding material is injected by the injection member.
[0059]
In this case, since the injection member is disposed in the cylindrical member so as to be movable back and forth, and the cylindrical member and the injection member are overlapped, the axial direction, the width direction, or the height direction of the injection device is reduced. Not only can the gas generated in the metering process escape from the rear part of the injection member.
[0060]
In addition, since the rotation of the cylindrical member and the retraction of the injection member are performed independently, when the cylindrical member is rotated and the molding material is moved forward in the measurement process, the inner peripheral surface of the cylinder member and the cylindrical shape are moved. Even if the molding material is caught between the outer peripheral surface of the member, the pressure of the molding material detected by the pressure detection unit does not vary. Accordingly, the back pressure can be adjusted in accordance with the detected pressure, so that the weighing can be performed accurately.
[0061]
And since the interruption | blocking part and a to-be-shielded part are contacted in an injection | pouring process, the molding material ahead of a interruption | blocking part and an injection member does not flow backward. Therefore, since it is not necessary to provide a backflow prevention device, the shape of the front end portion of the cylindrical member can be simplified, and the structure of the injection device can be simplified. In addition, the pressure resistance performance of the injection device can be increased, and the durability can be improved.
[0062]
And since it is not necessary to make an injection member into the shape which can measure a molding material, there is no limit in making the diameter of an injection member small. Therefore, the ratio between the amount of the molding material injected by the injection member and the amount of the molding material to be measured by the cylindrical member can be greatly different, and the maintenance and manageability can be improved.
[0063]
In addition, since the metering and injection can be performed in the cylinder member, the residence time of the molding material is shortened, and it can be prevented that the molding material is burned or the molding material is difficult to be changed. Maintenance and manageability can be improved.
[0064]
And since there is no need to arrange many heating members for heating the molding material, the structure of the injection apparatus can be simplified.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram of an injection molding machine according to a first embodiment of the present invention.
FIG. 2 is a diagram for explaining an injection process in the first embodiment of the present invention.
FIG. 3 is a cross-sectional view of a front end portion of an injection device according to a second embodiment of the present invention.
FIG. 4 is a sectional view of a front end portion of an injection apparatus according to a third embodiment of the present invention.
[Explanation of symbols]
14 Injection device
15 Body
18 Heating cylinder
19 Screw
21 Plunger
P1 insertion part
P2 insertion part
P3, P5 contact part
P4, P6 Contacted part

Claims (5)

(A) a main body portion of a driving device which is disposed on the frame so as to freely move back and forth and supports the driving portion for measurement and the driving portion for injection;
(B) a cylinder member that is disposed so as to be relatively movable with respect to the main body portion via a biasing member, and in which a blocked portion is formed on the inner periphery of the front end portion;
(C) an injection nozzle attached to the front end of the cylinder member;
(D) a plasticizing movement device that includes a driving unit for plasticizing movement, and moves the main body on the frame;
(E) in the cylinder member, rotatably relative to the cylinder member and is movably arranged, is arranged so as not to advance and retreat with respect to the body portion, cylindrical shape blocking portion is formed in a front end portion Members,
(F) In the cylindrical member, and having an injection member disposed so as to freely advance and retract,
(G) In the metering process, the plasticizing driver for moving is driven, in a state in which the injection nozzle has been brought into contact with the fixed mold, and before Symbol Main body portion with for provoking retraction, the wherein the blocking portion gap between the to-be-shutdown portion is formed, the driving unit for the metering is driven, the molding material is metered by the tubular member,
(H) In the injection step, as the main body is moved forward in a state where the driving unit for plasticizing movement is driven and the injection nozzle is in contact with the fixed mold, the blocking unit said and the object to be cut off portion is canceller contact, the driving unit for injection is driven, an injection device, characterized in that the molding material is injected by the injection member. Before SL tubular member is rotatably disposed, the injection device according to claim 1 is a screw for advancing the molding material in accordance with the rotation.   The injection device according to claim 1, wherein the injection member is a plunger that is disposed so as to be movable forward and backward, and that injects a molding material as it advances.   The injection device according to claim 1, wherein in the injection step, the blocking portion is inserted into the blocked portion with contact.   The injection device according to claim 1, wherein, in the injection step, the blocking portion is brought into contact with the blocked portion with contact.

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