Injection molding machine

Abstract

To provide an injection molding machine capable of dividing thermoplastic resin discharged through a conveyor.SOLUTION: An injection molding machine comprises a mold clamping device that opens and closes a metal mold and clamps the metal mold, and an injection device that injects thermoplastic resin. The injection device moves between an injection position in which a heating cylinder with a nozzle at a tip that injects the thermoplastic resin is connected to a cavity in the clamped metal mold, and a standby position in which it is separated from the metal mold. The injection molding machine comprises a conveyor that is provided on a path for discharging the plasticized resin from the heating cylinder in the standby position and transports the thermoplastic resin discharged from the nozzle to the outside of the injection molding machine, a reservoir movable between a reservoir position in which the thermoplastic resin transported by the conveyor is accumulated and a drop position in which the thermoplastic resin accumulated at the reservoir position is dropped, and a control device that moves the reservoir from the reservoir position to the drop position at predetermined intervals while the thermoplastic resin discharged from the nozzle is being transported on the conveyor.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to an injection molding machine for manufacturing an injection molded product by injecting a plasticized resin into a mold.

Background Art

[0002] In an injection molding machine, a purge operation for discharging the plasticized resin at a predetermined timing is performed to maintain the quality of the plasticized resin in the heating cylinder. In a conventional purge operation, it is common to discharge the plasticized resin from the heating cylinder toward a tray set in a locate portion directly below the nozzle.

[0003] On the other hand, in order to reduce the burden on the operator of setting the tray every time the purge operation is performed, an injection molding machine equipped with a conveyor for transporting the plasticized resin discharged from the heating cylinder to the outside of the injection molding machine has been developed (for example, see Patent Documents 1 and 2).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the injection molding machines described in Patent Documents 1 and 2, the plasticized resin discharged from the heating cylinder is transported continuously on the conveyor. As a result, there is a problem that the handling of the plasticized resin discharged to the outside of the injection molding machine in a continuous state becomes complicated.

[0006] The present invention has been made to solve such problems of the prior art, and an object thereof is to provide an injection molding machine capable of dividing the plasticized resin discharged through a conveyor. [Means for solving the problem]

[0007] To solve the aforementioned problems, the present invention provides an injection molding machine comprising a mold clamping device for opening and closing a mold and clamping the mold, and an injection device for injecting a plasticizing resin, wherein the injection device includes a heating cylinder with a nozzle for injecting a plasticizing resin formed at its tip, which moves between an injection position in which it communicates with the cavity of the clamped mold and a standby position where it is separated from the mold, and a conveyor positioned on the discharge path of the plasticizing resin from the heating cylinder at the standby position to transport the plasticizing resin discharged from the nozzle to the outside of the injection molding machine, a storage section that is movable to a storage position for storing the plasticizing resin transported by the conveyor and a drop position for dropping the plasticizing resin stored at the storage position, and a control device that moves the storage section from the storage position to the drop position at predetermined intervals while the plasticizing resin discharged from the nozzle is being transported to the conveyor. The control device causes the conveyor to transport the plasticizing resin at a first speed when the reservoir is at the reservoir position, and causes the conveyor to transport the plasticizing resin at a second speed faster than the first speed when the reservoir is at the drop position. It is characterized by the following: [Effects of the Invention]

[0008] According to the present invention, plasticizing resin discharged through a conveyor can be divided. [Brief explanation of the drawing]

[0009] [Figure 1] This is a front view of a vertical injection molding machine according to the first embodiment. [Figure 2] This is an enlarged schematic diagram of the injection device. [Figure 3] This is a hardware block diagram of an injection molding machine. [Figure 4] This is a flowchart of the purge control process. [Figure 5] This figure shows the state of the plasticizer resin during the purging control process. [Figure 6] This is a side view of a horizontal injection molding machine according to the second embodiment. [Figure 7] This is a front view of the heating cylinder, seen from the tip side.

[0010] The injection molding machine 10 according to the present invention will be described below with reference to the drawings. The embodiments of the present invention described below are merely examples of how the present invention can be implemented, and do not limit the scope of the present invention to the scope described in the embodiments. Therefore, the present invention can be implemented by making various modifications to the embodiments.

[0011] (First Embodiment) Figure 1 is a front view of the injection molding machine 10 according to the first embodiment. Figure 2 is an enlarged schematic diagram of the injection device 30. Figure 3 is a hardware block diagram of the injection molding machine 10. The injection molding machine 10 is a device that injects plasticizing resin into a mold to form an injection molded product. The injection molding machine 10 according to the first embodiment is a so-called "vertical type". As shown in Figures 1 to 3, the injection molding machine 10 mainly comprises a mold clamping device 20, an injection device 30, a display input device 40, and a control device 50.

[0012] The mold clamping device 20 opens and closes the mold 21 and clamps it. Specifically, the mold clamping device 20 mainly comprises a fixed die plate 23 that supports the fixed side mold 22, a movable die plate 25 that supports the movable side mold 24 directly above the fixed side mold 22, and a mold opening / closing motor 61 that moves the movable die plate 25 in the vertical direction.

[0013] The mold opening / closing motor 61 is a servo motor that moves the movable die plate 25 in the vertical direction. The driving force of the mold opening / closing motor 61 is transmitted to the movable die plate 25, for example, through a toggle link mechanism (not shown). As shown in Figure 1, when the movable die plate 25 rises, the fixed mold 22 and the movable mold 24 separate. On the other hand, when the movable die plate 25 lowers, the fixed mold 22 and the movable mold 24 come into contact, forming a cavity (internal space) inside the mold 21. Then, when further downward pressure is applied to the movable die plate 25, the fixed mold 22 and the movable mold 24 are clamped together.

[0014] The injection device 30 plasticizes, measures, and injects resin supplied from a hopper (not shown). The injection device 30 according to the first embodiment is located above the mold clamping device 20. The injection device 30 mainly comprises a heating cylinder 31, a screw 32, a conveyor 33, a reservoir 34 (reservation section), a nozzle touch motor 62, a metering motor 63, an injection motor 64, a conveyor reciprocating motor 65, a conveyor drive motor 66, and a reservoir cylinder 67.

[0015] The heating cylinder 31 is a cylindrical member extending in the vertical direction. The heating cylinder 31 has a nozzle hole 36a for injecting plasticizing resin formed at its tip (lower end), and a supply port (not shown) for receiving resin from the hopper formed at its base (upper end). Inside the heating cylinder 31, a linear internal space is formed from the supply port to the nozzle 36. A band heater (not shown) for heating the heating cylinder 31 may also be attached to the outer circumferential surface of the heating cylinder 31.

[0016] The nozzle touch motor 62 is a servo motor that moves the injection device 30 in the vertical direction. The injection device 30 moves vertically between the injection position (Figure 2(A)) and the standby position (Figures 2(B) to (D)) by the driving force transmitted from the nozzle touch motor 62. The injection position is the position where the nozzle 36 at the tip of the heating cylinder 31 enters an opening (not shown) provided in the movable die plate 25, and the internal space of the heating cylinder 31 and the cavity of the mold 21 are in communication. The standby position is the position where the nozzle 36 at the tip of the heating cylinder 31 exits from the opening of the movable die plate 25, and the heating cylinder 31 and the mold 21 are separated. In the first embodiment, the standby position is vertically above the injection position.

[0017] The screw 32 is a long rod-shaped member with spiral grooves formed on its outer peripheral surface. The screw 32 is accommodated in the internal space of the heating cylinder 31 in a state where it can advance, retreat, and rotate. The metering motor 63 is a servo motor that rotates the screw 32 within the heating cylinder 31. The injection motor 64 is a servo motor that advances and retreats (moves forward and backward) the screw 32 within the heating cylinder 31. The injection device 30 performs a metering operation, an injection operation, and a purge operation by advancing or rotating the screw 32 within the heating cylinder 31.

[0018] The metering operation is an operation of metering a predetermined amount of plasticized resin on the tip side (nozzle 36 side) of the heating cylinder 31 by rotating the screw 32. At this time, the resin supplied to the heating cylinder 31 is plasticized by the frictional heat and shear heat generated between the heating cylinder 31 and the screw 32, and the heat generated by the band heater. Also, the plasticized resin moves along the spiral grooves of the screw 32 to the tip side of the heating cylinder 31 and accumulates on the tip side of the heating cylinder 31. As a result, the screw 32 retreats while rotating within the heating cylinder 31.

[0019] The injection operation is an operation of injecting the plasticized resin metered on the tip side of the heating cylinder 31 from the heating cylinder 31 through the nozzle 36 by advancing the screw 32 when the injection device 30 is at the injection position. Thereby, the plasticized resin injected from the nozzle 36 is filled into the cavity of the mold 21.

[0020] The purging operation is the operation of discharging the plasticizing resin from the heating cylinder 31 when the injection device 30 is in the standby position. The purging operation is, for example, the operation of rotating the screw 32 in a direction that moves the plasticizing resin toward the nozzle 36, with the screw 32 positioned closest to the nozzle 36 (hereinafter referred to as the "forward position"). In the purging operation, back pressure is applied to the screw 32 by the injection motor 64 in order to hold the screw 32 in the forward position. However, the purging operation may also be achieved by advancing the screw 32 within the heating cylinder 31, thereby discharging the plasticizing resin metered at the tip of the heating cylinder 31 through the nozzle 36.

[0021] The conveyor 33 is responsible for transporting the plasticizing resin discharged from the heating cylinder 31 when the injection device 30 is in the standby position to the outside of the injection molding machine 10. In other words, the conveyor 33 is positioned on the discharge path of the plasticizing resin from the heating cylinder 31 in the standby position (directly below the nozzle hole 36a). Furthermore, the surface of the conveyor 33 is mesh-like in order to reduce the contact area with the plasticizing resin.

[0022] The conveyor 33 moves back and forth between a forward position (Figure 2(C), (D)) and a retracted position (Figure 2(A), (B)) by the driving force transmitted from the conveyor forward / retraction motor 65. The forward position is the position where the conveying surface (upper surface) of the conveyor 33 is positioned directly below the nozzle 36 (nozzle hole 36a) at the tip of the heating cylinder 31 in the standby position. The retracted position is the position where the conveyor 33 is out of the movement path of the heating cylinder 31. The forward and retracted positions are separated in the direction of conveyance of the plasticizing resin by the conveyor 33 (i.e., the left-right direction in Figure 2). In other words, the conveyor 33 moves back and forth along the direction of conveyance of the plasticizing resin.

[0023] When the conveyor 33 is in the forward position, the plasticizing resin discharged from the nozzle 36 (nozzle hole 36a) at the tip of the heating cylinder 31 in the standby position reaches the conveying surface of the conveyor 33, and the injection device 30 (heating cylinder 31) cannot move from the standby position to the injection position. On the other hand, when the conveyor 33 is in the retracted position, the plasticizing resin discharged from the nozzle 36 (nozzle hole 36a) at the tip of the heating cylinder 31 in the standby position does not reach the conveying surface of the conveyor 33, and the injection device 30 (heating cylinder 31) can move between the injection position and the standby position.

[0024] Furthermore, the conveyor 33 is driven by the conveyor drive motor 66 and rotates in a direction (counterclockwise in Figure 2) that discharges the plasticizing resin that has reached the conveying surface to the outside of the injection molding machine 10. The conveyor 33 may also be configured to allow switching of the conveying speed. The conveyor 33 according to the first embodiment is switchable to at least a first speed (low speed) and a second speed (high speed). The second speed is faster than the first speed.

[0025] The collection tray 34 plays the role of temporarily collecting the plasticizing resin discharged to the outside of the injection molding machine 10 by the conveyor 33. The collection tray 34 also plays the role of allowing the temporarily collected plasticizing resin to fall using gravity. The specific shape of the collection tray 34 is not particularly limited, but for example, the part that collects the plasticizing resin is flat.

[0026] The collection tray 34 is positioned directly below the downstream side of the conveyor 33 in the transport direction (the side exposed from the box body 37, which will be described later). The collection tray 34 also moves together with the conveyor 33, which moves between the forward position and the retracted position. Furthermore, the collection tray 34 moves (rotates) between the collection position (Figure 2(A), (B), (C)) and the drop position (Figure 2(D)) by the driving force transmitted from the collection tray cylinder 67. Note that the specific example of the drive source for moving the collection tray 34 is not limited to an air cylinder, but may also be an electric motor or the like.

[0027] The collection position is a location where the plasticizing resin transported by the conveyor 33 (more specifically, the resin that spills out from the downstream end in the conveying direction of the conveyor 33) can be collected. That is, as shown in Figures 2(A) to 2(C), the collection tray 34 at the collection position is held horizontally directly below the downstream end in the conveying direction of the conveyor 33. The drop position is the location where the plasticizing resin accumulated in the collection tray 34 at the collection position is dropped. The drop position is also a location outside the path of the plasticizing resin spilling out of the conveyor 33. That is, as shown in Figure 2(D), the collection tray 34 at the drop position is inclined downwards at a location outside the path of the plasticizing resin spilling out of the conveyor 33, with its tip pointing downwards.

[0028] As shown in Figure 2, the injection device 30 includes a box 37 that houses a heating cylinder 31 and a conveyor 33. The box 37 has slits 37a and 37b through which the heating cylinder 31 and the conveyor 33 are inserted, respectively. That is, the heating cylinder 31 and the conveyor 33 move back and forth within the internal space of the box 37 through the slits 37a and 37b.

[0029] Furthermore, the nozzle 36 at the tip of the heating cylinder 31 is always located inside the box 37. This prevents the operator from coming into contact with the plasticizing resin injected from the nozzle 36. However, the box 37 may have a door (not shown) or the like to expose the internal space for maintenance. Also, part of the conveyor 33 on the upstream side in the direction of transporting the plasticizing resin is located inside the box 37, and part of the conveyor 33 on the downstream side in the direction of transporting the plasticizing resin is located outside the box 37.

[0030] The display input device 40 is a user interface that includes a display for displaying various information to be notified to the operator, and buttons, switches, dials, etc. for receiving operations from the operator. The display input device 40 may also include a touch panel superimposed on the display. For example, the display input device 40 receives an operator's operation to instruct the start of an injection operation and an operator's operation to instruct the start of a purge operation, and outputs an operation signal corresponding to the received operation to the control device 50.

[0031] The control device 50 controls the operation of the entire injection molding machine 10. The control device 50 acquires operation signals output from the display input device 40 and encoded signals output from the encoders (not shown) of each motor 61-66. Based on the acquired signals, the control device 50 drives each motor 61-66 and the reservoir cylinder 67.

[0032] The control device 50 includes, for example, a CPU (Central Processing Unit) 51 which is a calculation means, a ROM (Read Only Memory) 52 which stores various programs, and a RAM (Random Access Memory) 53 which serves as a work area for the calculation means. The CPU 51 may then read and execute the programs stored in the ROM 52 to realize the processes described later.

[0033] However, the specific configuration of the control device 50 is not limited to this and may be implemented using hardware such as an ASIC (Application Specific Integrated Circuit) or FPGA (Field-Programmable Gate Array).

[0034] Next, the operation of the injection molding machine 10 according to the first embodiment will be described with reference to Figures 4 and 5. Figure 4 is a flowchart of the purge control process. Figure 5 is a diagram showing the state of the plasticizer resin during the purge control process. The purge control process is started, for example, when injection molding is completed. As shown in Figure 2(A), at the start of the purge control process, the injection device 30 (heating cylinder 31) is positioned at the injection position, the screw 32 is positioned at the furthest forward position, the conveyor 33 is positioned at the retracted position, and the reservoir 34 is positioned at the reservoir position.

[0035] First, the control device 50 drives the nozzle touch motor 62 to raise the injection device 30 (heating cylinder 31) from the injection position to the standby position (S11). As a result, as shown in Figure 2(B), the heating cylinder 31 rises and moves away from the mold 21, exposing the nozzle hole 36a of the nozzle 36.

[0036] Next, the control device 50 drives the conveyor advance motor 65 to move the conveyor 33 forward from the retracted position to the forward position (S12). As a result, as shown in Figure 2(C), the conveyor 33 is positioned directly below the heating cylinder 31 in the standby position. In other words, the control device 50 moves the injection device 30 (heating cylinder 31) to the standby position and then moves the conveyor 33 to the forward position. The control device 50 also drives the conveyor drive motor 66 to rotate the conveyor 33 at a first speed (S13).

[0037] Next, the control device 50 performs a purge operation (S14). That is, the control device 50 rotates the screw 32 in the heating cylinder 31 by driving the metering motor 63. The control device 50 then continues to rotate the screw 32 until a predetermined time has elapsed since the start of the purge operation (S15: No). In step S15, the control device 50 may monitor the time using a timer, or it may determine whether the rotation speed of the screw 32 has reached a threshold.

[0038] As a result, as shown by the thick line in Figure 5(A), the plasticizing resin discharged from the heating cylinder 31 is transported to the outside of the box body 37 (injection molding machine 10) by the conveyor 33, which rotates at the first speed, in a continuous, uninterrupted state. The plasticizing resin that spills out from the downstream end of the conveyor 33 then accumulates on the collection tray 34 at the collection position.

[0039] Next, the control device 50 drives the collection tray cylinder 67 to move the collection tray 34 from the collection position to the drop position (S16) in response to a predetermined time having elapsed since the start of the purging operation (or the rotational speed of the screw 32 reaching a threshold) (S15: Yes). As a result, as shown in Figure 5(B), the mass of plasticizer resin accumulated in the collection tray 34 falls due to its own weight. In addition, the plasticizer resin on the conveyor 33 is pulled by the mass of plasticizer resin accumulated in the collection tray 34. As a result, the continuous mass of plasticizer resin is interrupted at the position of the nozzle hole 36a.

[0040] Furthermore, the control device 50 moves the collection tray 34 to the drop position and simultaneously causes the screw 32 to suck back (S17). "Suck back" is the process of moving the screw 32 backward (away from the nozzle 36) within the heating cylinder 31 by driving the injection motor 64. As a result, the space on the nozzle 36 side of the tip of the screw 32 becomes negative pressure, and the discharge of plasticizing resin from the nozzle 36 stops.

[0041] Furthermore, in parallel with moving the collection tray 34 to the drop position, the control device 50 increases the conveying speed of the conveyor 33 from the first speed to the second speed (S18). As a result, the plasticizing resin on the conveyor 33 is pulled, and the continuous plasticizing resin is interrupted at the position of the nozzle hole 36a. In other words, when the collection tray 34 is in the collection position, the control device 50 causes the conveyor 33 to convey the plasticizing resin at the first speed. Also, when the collection tray 34 is in the drop position, the control device 50 causes the conveyor 33 to convey the plasticizing resin at the second speed.

[0042] Next, the control device 50 determines whether or not a predetermined amount of plasticizing resin has been discharged (S19). If the control device 50 determines that a predetermined amount of plasticizing resin has not yet been discharged (S19: No), it drives the collection tray cylinder 67 to move the collection tray 34 from the drop position to the collection position (S20). The control device 50 also drives the injection motor 64 to advance the screw 32 to its furthest forward position within the heating cylinder 31 (S21). Furthermore, the control device 50 repeats the process from step S13 onward.

[0043] In other words, the control device 50 executes steps S16 to S18 at predetermined intervals during the repeatedly performed steps S13 to S21 (i.e., while the plasticizing resin discharged from the nozzle 36 is being transported to the conveyor 33). In other words, the plasticizing resin continuously discharged from the nozzle 36 during the purging operation is divided and discharged at predetermined intervals. When the control device 50 determines that a predetermined amount of plasticizing resin has been discharged (S19: Yes), it stops the conveyor 33 (S22) and terminates the purging control process.

[0044] According to the first embodiment, for example, the following effects are achieved.

[0045] According to the first embodiment, by moving the collection tray 34 from the collection position to the drop position at predetermined intervals during the purging operation, the plasticizing resin discharged in a continuous stream on the conveyor 33 can be divided at predetermined intervals. Furthermore, since the division is performed using the weight (i.e., gravity) of the plasticizing resin accumulated in the collection tray 34, the aforementioned effects can be achieved with a simpler configuration compared to mounting a cutter or the like to cut the plasticizing resin.

[0046] Furthermore, according to the first embodiment, the plasticizing resin can be more reliably separated by sucking back the screw 32 in parallel with moving the collection tray 34 to the drop position.

[0047] Furthermore, according to the first embodiment, by temporarily increasing the conveying speed of the plasticizing resin by the conveyor 33 in parallel with moving the collection tray 34 to the drop position, the plasticizing resin can be divided more reliably.

[0048] Note that some of the processes in steps S16 to S18 in Figure 4 can be omitted. More specifically, in the purge control process, it is sufficient for at least one of steps S16 and S18 to be executed. As an example, the control device 50 may move the collection tray 34 from the collection position to the drop position at predetermined intervals while the plasticizing resin discharged from the nozzle 36 is being transported to the conveyor 33. As another example, the control device 50 may switch the transport speed of the plasticizing resin by the conveyor 33 between a first speed and a second speed at predetermined intervals while the plasticizing resin discharged from the nozzle 36 is being transported to the conveyor 33.

[0049] (Second Embodiment) Next, the injection molding machine 10A according to the second embodiment will be described with reference to Figures 6 and 7. Figure 6 is a side view showing the schematic configuration of the injection molding machine 10A. Figure 7 is a front view seen from the tip side of the heating cylinder 31. Components that perform functions common to the first embodiment are given the same reference numerals, and detailed descriptions are omitted.

[0050] The injection molding machine 10A according to the second embodiment is a so-called "horizontal type" in which the injection device 30 (heating cylinder 31) moves horizontally between an injection position and a standby position that are spaced apart horizontally. In other words, the injection molding machine 10A according to the second embodiment differs from the injection molding machine 10 according to the first embodiment in that the positional relationship of the main components 22-25 and 31-32 is reversed by 90°.

[0051] Furthermore, the injection molding machine 10A according to the second embodiment is equipped with a guide plate 38. The guide plate 38 is responsible for guiding the plasticizing resin discharged from the heating cylinder 31 during the purging operation to the conveying surface of the conveyor 33. The guide plate 38 moves between a retracted position (Figure 7(A)) and a guide position (Figure 7(B)) by the driving force transmitted from a guide plate advance / retract motor (not shown).

[0052] The retracted position is a position outside the movement path of the heating cylinder 31. The guide position is a position on the movement path of the heating cylinder 31. That is, when the guide plate 38 is in the retracted position, the plasticizing resin discharged from the heating cylinder 31 in the standby position does not reach the guide plate 38, and the injection device 30 (heating cylinder 31) can move between the standby position and the injection position. On the other hand, when the guide plate 38 is in the guide position, the plasticizing resin discharged from the heating cylinder 31 in the standby position reaches the guide plate 38, and the injection device 30 (heating cylinder 31) cannot move from the standby position to the injection position.

[0053] Furthermore, the conveyor 33 according to the second embodiment is fixed directly below the nozzle 36 at the tip of the heating cylinder 31 in the standby position, and directly below the guide plate 38 in the guide position. That is, both the plasticizing resin that leaks out little by little from the heating cylinder 31 in the standby position, and the plasticizing resin that is forcefully discharged from the heating cylinder 31 in the standby position and reaches the guide plate 38, reach the conveying surface of the conveyor 33 and are transported to the outside of the injection molding machine 10A.

[0054] The injection molding machine 10A according to the second embodiment performs the purge control process shown in Figure 4. However, the control device 50 according to the second embodiment moves the guide plate 38 from the retracted position to the guide position after moving the injection device 30 (heating cylinder 31) from the injection position to the standby position. Furthermore, the control device 50 according to the second embodiment moves the guide plate 38 from the guide position to the retracted position before moving the injection device 30 (heating cylinder 31) from the standby position to the injection position.

[0055] According to the second embodiment, the plasticizing resin, which is forcefully discharged from the nozzle 36 at the tip of the heating cylinder 31 by the purging operation, hits the guide plate 38 at the guide position and is guided to the conveying surface of the conveyor 33. As a result, in the horizontal injection molding machine 10A, the plasticizing resin discharged by the purging operation can be reliably and efficiently discharged to the outside of the injection molding machine 10A via the conveyor 33. [Explanation of Symbols]

[0056] 10, 10A…Injection molding machine, 20…Clamping device, 21…Mold, 22…Fixed mold, 23…Fixed die plate, 24…Movable mold, 25…Movable die plate, 30…Injection device, 31…Heating cylinder, 32…Screw, 33…Conveyor, 34…Collection tray, 36…Nozzle, 36a…Nozzle hole, 37…Box body, 37a, 37b…Slit, 38…Guide plate, 40…Display input device, 50…Control device, 51…CPU, 52…ROM, 53…RAM, 61…Mold opening / closing motor, 62…Nozzle touch motor, 63…Measuring motor, 64…Injection motor, 65…Conveyor advance / reverse motor, 66…Conveyor drive motor, 67…Collection tray cylinder

Claims

1. In an injection molding machine equipped with a mold clamping device for opening and closing the mold and clamping the mold, and an injection device for injecting plasticizing resin, The injection device moves a heated cylinder, with a nozzle formed at its tip for injecting plasticizer resin, between an injection position where it is connected to the cavity of the clamped mold and a standby position where it is separated from the mold. A conveyor is positioned on the discharge path of the plasticizing resin from the heating cylinder at the standby position, and transports the plasticizing resin discharged from the nozzle to the outside of the injection molding machine. A collection section that can move to a collection position for collecting the plasticizing resin transported by the conveyor, and a collection section that can move to a collection position for dropping the plasticizing resin collected at the collection position, The system includes a control device that moves the reservoir from the reservoir position to the drop position at predetermined intervals while the plasticizing resin discharged from the nozzle is being transported to the conveyor, The control device is When the reservoir is in the reservoir position, the plasticizing resin is transported by the conveyor at a first speed. An injection molding machine characterized in that, when the reservoir is at the drop position, the plasticizing resin is transported on the conveyor at a second speed faster than the first speed.

2. The heating cylinder is equipped with a screw that can move forward and backward and rotate, The injection molding machine according to claim 1, characterized in that the control device moves the reservoir to the drop position while simultaneously retracting the screw within the heating cylinder.

3. In an injection molding machine equipped with a mold clamping device for opening and closing the mold and clamping the mold, and an injection device for injecting plasticizing resin, The injection device moves a heated cylinder, with a nozzle formed at its tip for injecting plasticizer resin, between an injection position where it is connected to the cavity of the clamped mold and a standby position where it is separated from the mold. A conveyor is positioned on the discharge path of the plasticizing resin from the heating cylinder at the standby position, and transports the plasticizing resin discharged from the nozzle to the outside of the injection molding machine. An injection molding machine characterized by comprising a control device that, while the plasticizing resin discharged from the nozzle is being transported to the conveyor, switches the transport speed of the plasticizing resin by the conveyor between a first speed and a second speed faster than the first speed at predetermined intervals.

4. The injection molding machine is of a vertical type in which the standby position is located vertically above the injection position. The aforementioned conveyor is After the injection device moves to the standby position, it moves to the forward position directly below the heating cylinder. The injection molding machine according to claim 1 or 3, characterized in that the injection device moves to a retracted position away from the movement path of the heating cylinder before moving to the injection position.

5. The injection molding machine is a horizontal type in which the injection position and the standby position are separated horizontally. The injection molding machine according to claim 1 or 3, characterized in that the conveyor is fixed directly below the nozzle of the heating cylinder in the standby position.

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