JP5173009B1 - Material supply equipment for injection molding machines - Google Patents

Abstract

An object of the present invention is to provide a material supply device for an injection molding machine in which the phase between a plurality of supply screws can be easily adjusted during assembly adjustment, and the phase between supply screws before and after disassembly can be easily restored.
First and second supply screws 12a and 12b are coupled to power shafts 26a and 26b having gears 28a and 28b coupled to a motor 30 via connecting members 24a and 24b, and screw grooves 16a. And the screw groove 16b have a structure with spiral grooves that are opposite to each other, and the screw flights 14a and 14b are arranged so as to protrude into the mating screw grooves 16a and 16b, and the respective rotation axes are parallel to each other. Two connecting members 24a and 24b are arranged side by side inside the material supply apparatus main body 10, and the connecting members 24a and 24b are connected to the supply screw or the power shaft at one end and a phase adjusting portion for coupling the power shaft to the other end and the power shaft at the other end. Or the material supply apparatus of the injection molding machine provided with the coupling | bond part which can be couple | bonded with this supply screw in the position where a phase is free.
[Selection] Figure 1

Description

  The present invention relates to an injection molding machine, and more particularly to a material supply apparatus that supplies resin to an injection molding machine.

FIG. 11 shows a general structure of a material supply apparatus that conveys a material using a supply screw to the injection molding machine main body, and FIG. 12 shows a structure of a material supply apparatus of another form. The material supply device 1 includes a material supply device main body 10 provided with a material supply port 6 and a material discharge port 18, and a rotatable supply screw 12 formed with a spiral groove formed in the main body. Reference numeral 12 is connected to a driving device such as a motor 30. The material supply port 6 is connected to the hopper 5 and the like, and the material discharge port 18 is connected to the material supply port 4 of the injection molding machine. 11 and 12 differ only in that the position where the motor 30 is installed is the material supply port 6 side or the material discharge port 18 side, and there is no functional difference.
Here, the material is mainly a pellet-shaped resin. The resin pellets supplied to the material supply port 6 of the material supply device 1 through the hopper 5 are conveyed to the material discharge port 18 through the groove of the supply screw 12 by the rotation of the supply screw 12 driven by the motor 30. It is supplied from the material discharge port 18 into the heating cylinder 2 through the material supply port 4 of the heating cylinder 2 in which the plasticizing screw 3 of the injection molding machine is inserted, and used for molding.

Normally, the material supply device 1 has one supply screw 12 and the resin is cut out as needed by the amount required for molding by the amount of rotation of the supply screw 12 of the material supply device 1. However, materials of various shapes are used for injection molding instead of pellet-shaped resin. For example, a pulverized material obtained by pulverizing a once molded product or runner into an appropriate particle size by a pulverizer may be reused. In some cases, a powdery resin is used as the material, or a plate-like rubber is used as the material.
In order to transport these various forms of materials, there is a limit to the supply screw having only one shaft, and it is effective to increase the material transport capability by using a plurality of shafts of the supply screw 12. For example, Patent Document 1 discloses a technique in which a supply screw is biaxial as a resin conveying device in which glass fibers are mixed.

Japanese Patent Publication No. 6-51330

  Here, in the case of a material supply device in which the supply screw is multi-axial and feeds the material using a spiral groove, the outer periphery of the supply screw enters the inner side of the outer periphery of the other supply screw for the purpose of conveying the material. It is thought that it is main that it is arranged. Therefore, the screw flight of the supply screw is arranged in such a way that it enters the screw groove of the other supply screw, and in order to avoid interference between the screw flights of the supply screw during operation, it is possible to drive the supply screws in synchronization with each other. Required. Further, it is necessary to adjust the phase of the supply screw in the rotation direction so that the supply screws do not interfere with each other during assembly.

On the other hand, the material supply apparatus often performs disassembly and cleaning in order to remove fine resin or the like that causes molding defects periodically or when changing the type of resin. It is necessary to remove the supply screw at the time of disassembly and cleaning, and to adjust and assemble again to avoid the aforementioned interference of the supply screw at the time of reassembly.
Even if the supply screws are assembled so that they do not interfere with each other, if the phase relationship between the supply screws changes before and after disassembly, the amount of resin fed per screw rotation will change. For example, in the case of a material supply apparatus that feeds a material while controlling the amount of resin fed, the supply state changes when the amount of resin fed changes, and it becomes necessary to adjust the molding conditions again. Therefore, it is desirable that the phase relationship between the plurality of supply screws before disassembly can be easily restored at the time of reassembly after disassembly described above.

  Therefore, the present invention can easily adjust the phase (rotation direction) of the rotation direction between supply screws during assembly adjustment in the above-described material supply apparatus using a plurality of supply screws, and supply screws for maintenance and the like. It is an object of the present invention to provide a material supply device for an injection molding machine having a structure in which the phase between supply screws can be easily restored before and after disassembly of the material supply device when adjustment of the phase between them is unnecessary.

The invention according to claim 1 of the present application is the material supply device of an injection molding machine that conveys the material supplied from the hopper to the injection cylinder by rotating a plurality of supply screws provided side by side. A connecting member connected to a power shaft that transmits a rotational force to the power supply shaft, the connecting member connected to one end of the supply screw or the power shaft in phase with each other in the rotational direction, and the other end of the power shaft. A material supply device for an injection molding machine, comprising: a shaft or a connecting portion that can be connected to the supply screw at a position where the phase is free.
The invention according to claim 2 is a structure in which the phasing portion includes a key and a key hole for inserting the key provided in correspondence with a key hole for inserting the key provided in the supply screw or the power shaft, A pin and the supply screw into which the pin is inserted or a structure including a hole penetrating the power shaft and the connection member, and a shape portion having a detent portion provided at one end of the supply screw or the power shaft. 2. The material supply device for an injection molding machine according to claim 1, wherein the material supply device has one of a structure including a fitting hole having a detent portion provided in the connection member. 3.
According to a third aspect of the present invention, each of the plurality of supply screws or the connection member is provided with a notch for adjusting the phase, and an auxiliary member is inserted into the notch to adjust the phase in the rotation direction of the supply screw. The material supply device for an injection molding machine according to any one of claims 1 and 2, characterized in that they are combined.
The invention according to claim 4 is characterized in that each of the power shafts is driven by one motor via a synchronization mechanism, and the material supply for the injection molding machine according to any one of claims 1 to 3 Device.
The invention according to claim 5 includes a motor for driving each of the power shafts, and the motor is synchronously controlled, The material supply for the injection molding machine according to any one of claims 1 to 3 Device.
The invention according to claim 6 includes a motor for driving each of the power shafts, and the power shafts are synchronized via a synchronization mechanism. It is the material supply apparatus of an injection molding machine.

  According to the present invention, in the material supply apparatus using a plurality of supply screws, the phase in the rotational direction between the supply screws can be easily adjusted during assembly adjustment, and the phase adjustment between the supply screws is not required during maintenance. It is possible to provide a material supply device for an injection molding machine having a structure in which the phase in the rotational direction between the supply screws can be easily restored before and after the material supply device is disassembled.

It is sectional drawing which desires the material supply apparatus of the injection molding machine of the 1st Embodiment of this invention from the hopper side. It is a figure which expands and demonstrates the connection member shown by FIG. 1 seen from the supply screw side. It is a figure which expands and demonstrates the connection member shown by FIG. 1 seen from the power shaft side. It is a figure explaining the 2nd Embodiment of this invention. It is a figure explaining the 3rd Embodiment of this invention. It is a figure explaining the 4th Embodiment of this invention. It is AA sectional drawing of the notch part shown by FIG. It is a figure explaining the fastening method of a connection member and a supply screw. It is a figure explaining the 5th Embodiment of this invention. It is a figure explaining the 6th Embodiment of this invention. It is a figure explaining the conventional material supply apparatus used for an injection molding machine. It is a figure explaining the other conventional material supply apparatus used for an injection molding machine.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, about the structure which is the same as that of a prior art, or similar, it demonstrates using the same code | symbol.
<First Embodiment>
FIG. 1 is a cross-sectional view of a first embodiment of a material supply apparatus according to the present application as viewed from an upper surface on a hopper side. The positional relationship between the material supply device 1 of the first embodiment and the heating cylinder 2 of the injection molding machine is the same as that in FIG. In FIG. 1, a first supply screw 12 a and a second supply screw 12 b are provided side by side in parallel with two rotation center shafts 120 a and 120 b inside the material supply apparatus main body 10. The 1st supply screw 12a has each part of screw flight 14a, screw slot 16a, and supply screw base 22a. Moreover, the 2nd supply screw 12b has each part of the screw flight 14b, the screw groove | channel 16b, and the supply screw base 22b. The first supply screw 12a and the second supply screw 12b have a structure having a spiral groove in which the screw groove 16a and the screw groove 16b are opposite to each other, and each screw flight 14a, 14b The screw grooves 16b and 16a are provided so as to protrude from the screw grooves 16b and 16a.

The first supply screw 12a is coupled to the power shaft 26a via a connection member 24a. Similarly, the 2nd supply screw 12b is connected with the power shaft 26b through the connection member 24b. The power shafts 26a and 26b are provided with gears 28a and 28b, and are further connected to a rotation shaft (load shaft) of the motor 30. The power shaft 26a and the rotating shaft of the motor 30 are connected by a fixing means such as a bolt (not shown).
The connecting members 24a and 24b are parts such as so-called shaft couplings. The outer peripheral shape of the connecting members 24a and 24b is not limited to a circular cross section. One end of the connection member 24a is connected to the supply screw base 22a of the first supply screw 12a, and the other end is connected to the power shaft 26a. Similarly, one end of the connection member 24b is connected to the supply screw base 22b of the second supply screw 12b, and the other end is connected to the power shaft 26b.

  When the motor 30 as a driving device rotates, the rotational force of the motor 30 is transmitted through the power shafts 26a and 26b, the gears 28a and 28b, and the connecting members 24a and 24b, and the supply screws 12a and 12b are synchronized with each other. It rotates in the opposite direction (see reference numerals 66a and 66b in FIG. 10). The material is supplied into the material supply apparatus main body 10 from the material supply port 6 indicated by a one-dot chain line above the base side of the supply screws 12a and 12b, and is conveyed to the material discharge port 18 by the supply screws 12a and 12b. Supplied with. The molding machine main body means a heating cylinder (injection cylinder) 2 as shown in FIGS.

  A view of the connecting members 24a and 24b in FIG. 1 as viewed from the supply screws 12a and 12b is shown in FIG. 2, and a view of the connection members 24a and 24b as viewed from the power shafts 26a and 26b is shown in FIG. In addition, since the connection member 24a and the connection member 24b have the same structure, in FIG. 2, they are collectively referred to as the connection member 24 and described. Similarly, the supply screws 12a and 12b will be collectively referred to as the supply screw 12, and the supply screw bases 22a and 22b will be collectively referred to as the supply screw base 22. 3, 4, 5, and 8, as in FIG. 2, each symbol is described by omitting “a” and “b”. For example, in FIG. 3, the connecting member 24 means connecting members 24a and 24b, and the screw 40 means screws 40a and 40b. The same applies to other codes.

  Female screw holes (holes 38, 42) for screwing screws 34, 40 are processed in the connecting member 24. Further, a key groove 242 that is a key hole for inserting the key 32 provided in the hole 240 on the supply screw connection side (connection side of the supply screw base 22) of the connection member 24, and a supply screw corresponding to the key groove 242 The phase (relative position in the rotational direction) of the connecting member 24 and the supply screw 12 is uniquely determined by the key groove 220 and the key 32 which are key holes provided in the base portion 22. On the other hand, the hole 244 provided on the power shaft 26 side of the connection member 24 is a concentric circular hole with the rotation center shaft 120 as the center, and the connection member 24 and the power shaft 26 can be freely attached in phase. That is, the hole 244 and the power shaft 26 constitute a coupling portion that can connect the supply screw 12 and the power shaft 26 at a position where the phase is free.

  One end of the connection member 24 is connected by contact friction generated by the structure of the supply screw base 22 of the supply screw 12, the bolt (screw 34), the slit 36, and the hole 38, and the power shaft 26, the bolt (screw 40), and the slit. The other end is connected by contact friction generated by the structure of 44 and the hole 42. The contact friction is generated by tightening the bolts (34, 40), narrowing the gap between the slits 36, 44 and pressing the inner peripheral surface of the connecting member 24 against the outer peripheral surface of the supply screw base 22 and the outer peripheral surface of the power shaft 26. The supply screw 12, the connecting member 24, and the power shaft 26 are connected so that their rotation center axes coincide.

Here, the assembly method of the material supply apparatus using the connection member of this embodiment is demonstrated. First, when the material supply apparatus 1 is assembled from scratch, first, the connecting members 24a and 24b and the first and second supply screws 12a and 12b are assembled to the material supply apparatus main body 10. At this time, the screw 34 may be screwed into the hole 38. And after adjusting the phase of the 1st supply screw 12a and the 2nd supply screw 12b so that it may become a target state, the connecting members 24a and 24b and the power shafts 26a and 26b are fixed by screwing in the screw 40.
Since the connecting members 24a, 24b and the power shafts 26a, 26b can be freely attached in phase, the shafts on the supply screw 12 side can be fixed without shifting by the meshing of the teeth of the gears 28a, 28b. Since the phase adjustment of the supply screw 12a and the second supply screw 12b is not influenced by the structure of the other mechanism, the assembling work is easy.

On the other hand, when disassembling and cleaning, the connection members 24a and 24b and the supply screw bases 22a and 22b are fixed, and the power shafts 26a and 26b of the connection members 24a and 24b are not removed. To remove the connection members 24a, 24b and the supply screw bases 22a, 22b from each other, loosen the screws 34 so that no contact friction occurs, and the supply screws 12a, 12b are pulled out in the direction of the screw tips 20a, 20b. Good. As a result, only the supply screws 12 a and 12 b can be detached from the material supply apparatus main body 10. By disassembling in this way, the position of the key groove 220 for the key 32 provided on the supply screw bases 22a and 22b of the supply screw 12a and 12b and the key groove 242 provided on the connecting member 24 at the time of reassembly. If the key 32 is inserted into the key groove 220 and the key groove 242, and the screw 34 is screwed into the hole 38, the phase state of the first supply screw 12a and the second supply screw 12b before disassembly can be easily achieved. Restored.
As described above, when the phase adjustment of the supply screws 12a and 12b is necessary, such as when the material supply apparatus 1 is assembled, the phase can be easily adjusted without being influenced by the meshing of the teeth of the gears 28a and 28b. When phase adjustment of the supply screws 12a and 12b is not necessary, such as during disassembly and cleaning, the material supply device 1 in which the supply screws 12a and 12b can be removed is realized so that the phase state before disassembly can be easily restored.

  In the first embodiment, key grooves (key grooves 242a and 242b) are provided on the side surfaces of the holes 240a and 240b on the supply screw base portions 22a and 22b side of the connection members 24a and 24b, and the side surfaces of the supply screw base portions 22a and 22b. Key grooves 220a and 220b are provided, and the key 32 is inserted into the key grooves 242a and 242b and the key grooves 220a and 220b, and the holes 244a and b on the power shafts 26a and 26b are provided with round holes. However, not limited to this, conversely, round holes are provided as the holes 240a, b on the supply screw bases 22a, 22b side, key holes (notches) are provided in the holes 244 on the power shafts 26a, 26b side, and a key is provided on the power shaft side. You may use the keyway which inserts.

In the case of such a structure, when phase adjustment of the supply screws 12a and 12b is not necessary, such as during disassembly and cleaning, the supply screws 12a and 12b and the connection members 24a and 24b are connected to the power shafts 26a and 26b while being integrated with each other. If the supply screws 12a and 12b are removed together with the connection members 24a and 24b at the connection portions of the members 24a and 24b, the same effect as that of the first embodiment can be obtained. However, considering the ease of cleaning and assembling of the supply screws 12a and 12b, it is better to remove the supply screws 12a and 12 alone, and it is preferable to provide the key holes in the direction as in the first embodiment.
In addition, although the key 32 is used in the first embodiment as a method for determining the phases of the supply screws 12a and 12b and the connecting members 24a and 24b, the present invention is not limited to this. The configuration shown in FIG. 4 is shown in FIG. 5 as a third embodiment. In the second and third embodiments, the entire material supply apparatus 1 is the same as the configuration shown in FIG. 11 and the configuration shown in FIG. 1, and only the fixing method of the supply screw and the connecting member is different.

<Second Embodiment>
FIG. 4 is a diagram for explaining the second embodiment. The supply screw 12 used in the second embodiment has a supply screw base 46 instead of the supply screw base 22 as a supply screw base. In the second embodiment, the phases of the supply screw 12 and the connection member 48 are determined using the configuration of the pin hole 482 provided in the pin 50 and the connection member 48 and the pin hole 460 provided in the supply screw base 46. ing. The configuration of the connection member 48 is the same as that of the connection member 24 except for a configuration in which a pin hole for inserting the pin 50 is provided instead of the phase adjustment configuration by the key 32 of the connection member 24.
It is desirable that the pin hole penetrates as shown in FIG. 4 so that the pin 50 can be easily removed when the supply screw 12 is detached from the material supply apparatus main body 10. Further, in the case where the pin 50 is a parallel pin, there is a possibility that the pin 50 may be shifted by 180 degrees with respect to the through hole. Further, since the taper pin is corrected if the pin is inserted even if the center of the taper pin is slightly deviated from the center, it can be expected that the taper pin is easy to assemble.

<Third Embodiment>
FIG. 5 is a diagram for explaining the third embodiment. The supply screw 12 used in the third embodiment has a supply screw base 52 instead of the supply screw base 22 as a supply screw base. In the third embodiment, the outer periphery of the supply screw base 52 is formed into a shape portion having a detent portion, and the inner circumference of the fitting hole provided in the connection member 54 is formed into a shape having a detent portion so that the phase is determined only by fitting. To be. In order to obtain a shape having a detent portion, as shown in FIG. 5, a portion having a cross-sectional shape having a different radius with respect to the rotation center shaft 120 is provided, thereby forming a shape portion having a detent portion or a fitting hole. be able to.
The configuration of the connecting member 54 is provided in the connecting member 54 and the shape portion having a rotation preventing portion around the outer periphery of the supply screw base 52 instead of the phase adjustment configuration by the key 32 of the connecting member 24 in the first embodiment. The rest of the configuration is the same as that of the connecting member 24 except for a configuration in which the fitting hole has a shape having a rotation preventing portion and the phase is determined only by the fitting.

In the third embodiment, since the phase is determined only by the supply screw 12 and the connection member 54, the number of parts can be reduced. In both the second and third embodiments, when adjustment of the supply screw is required, such as when assembling the material supply device, for the same reason as in the first embodiment, it is not affected by the meshing of the teeth of the gear 28 or the like. When the phase can be adjusted and phase change is not necessary, such as during disassembly cleaning, a material supply device is realized in which the supply screw can be removed so that the phase state before disassembly can be easily restored.
In both the second and third embodiments, the screw shaft side is a round hole for the same reason as the first embodiment described above, and the phase is adjusted using a hole shape having a pin or a detent portion on the power shaft side. A connecting member to be determined may be used.

<Fourth Embodiment>
FIG. 6 shows a fourth embodiment of the present invention, and FIG. 7 shows an AA cross section of FIG. The positional relationship between the material supply device 1 and the heating cylinder 2 of the molding machine is the same as in FIG. 1, and the connection between the supply screw 12 and the connection member is any one of the first to third embodiments. To do. In the fourth embodiment, notches are provided in the supply screw bases of the supply screws 12a and 12b in the first to third embodiments. Supply screws 12a and 12b used in the fourth embodiment include supply screw bases 58a and 58b in place of the supply screw bases 22a and 22b of the first embodiment. The supply screw bases 58a and 58b are provided with notches 60a and 60b. The cutouts 60a and 60b are provided at positions where the respective supply screws 12a and 12b are in a target phase to be adjusted when the cutouts face each other.

  When adjusting the phase of the supply screws 12a and 12b (relationship between rotational positions in the rotational direction) during assembly of the material supply apparatus 1, the distance between the facing notches 60a and 60b is set to L2 as shown in FIG. Then, the auxiliary member 62 having a width L1 slightly smaller than L2 is inserted as shown by an arrow at a location where the notches 60a and 60b face each other, so that the notches 60a and 60b are supplied following the auxiliary member 62. The screws 12a and 12b are adjusted to the target phase.

  After the adjustment, the connecting members 24a and 24b are fixed and the auxiliary member 62 is removed. By this operation, the adjustment can be performed more easily and accurately than the adjustment using visual observation or a measuring instrument. In addition, since the supply screws 12a and 12b can be phase-matched at the same position between the material supply apparatuses 1, individual differences between the apparatuses during assembly can be suppressed.

In the fourth embodiment, square cutouts and square blocks are used. However, the present invention is not limited to this, and V-grooves, circular cutouts with less stress concentration, round holes, etc., blocks corresponding to the respective cutout shapes, A pin or the like may be used, and the shape may be selected in consideration of processing accuracy and convenience of adjustment. Moreover, you may prepare the place of a notch in a connection member. For the same reason as in the first to third embodiments described above, the screw shaft side is a round hole, and the phase is determined using a hole shape having a key, a pin, or a detent portion on the power shaft side. A connecting member may be used. However, in the case of the above structure, the notch for determining the phase needs to be provided in the supply screw bases of the supply screws 12a and 12b.
When the cutout 60 is provided in the supply screw 12, the phase at the time of disassembly and cleaning described above can be restored by using the cutout 60 and the auxiliary member 62 without providing the key 32 and the key grooves 220 and 242. However, in the method using the auxiliary member 62, there is a risk of losing the auxiliary member, or there is a fear of damaging the device by starting the device without removing the auxiliary member. A structure that can restore the phase without using it is desirable.

In the first to fourth embodiments described above, the connecting member and the supply screw or the power shaft connecting means have been described as slits and bolts. However, the present invention is not limited to this, and a fastening method used for a general shaft coupling is used. Can be used. For example, as an example of a fastening method corresponding to FIG. 2, the fastening may be performed by contact friction using the connection member 64 and the set screw 66 as shown in FIG. 8. The fastening method may be selected appropriately according to the magnitude of torque to be transmitted and the size of the connecting member.
In the first to fourth embodiments, the motor and the gear are used for power transmission of the supply screw. However, the effect of the present invention is not affected by the power transmission means. For example, even if a pulley, a belt, a gear, and a chain are used instead of the gear 28, the effect does not change (synchronous mechanism according to claim 4). Further, the same effect can be obtained by adopting the same structure even in a configuration in which the motor is directly connected to each power shaft and the motor is synchronously controlled (synchronous control according to claim 5) (see FIG. 9). A configuration in which the synchronization mechanism and the motor are directly connected to the respective power shafts, and a configuration in which a plurality of supply screws are driven in synchronization (synchronization mechanism of claim 6) may be employed (see FIG. 10).

Further, in any of the first to fourth embodiments, the positional relationship between the material supply device 1 and the heating cylinder 2 of the molding machine has been described as being the same as that in FIG. 11, but the installation position of the motor is not affected by the function. For example, even when a motor is installed on the material discharge port 18 side as shown in FIG. 12, the same effect can be obtained by adopting the same structure.
Further, in all of the first to fourth embodiments, the number of supply screws 12 has been described as two. However, the present invention is not limited to this, and the same effect can be obtained by adopting the same structure even when three or more supply screws 12 are arranged. Is obtained. In general, as the number of axes of the supply screw 12 increases, the phase adjustment for avoiding the interference of the supply screw becomes more difficult. Therefore, the effect provided by the material supply device of the injection molding machine according to the present invention increases.

DESCRIPTION OF SYMBOLS 1 Material supply apparatus 2 Heating cylinder 3 Plasticizing screw 4 Material supply port 5 Hopper 6 Material supply port

DESCRIPTION OF SYMBOLS 10 Material supply apparatus main body 12 Supply screw 12a 1st supply screw 12b 2nd supply screw

14 Screw flight 14a, 14b Screw flight

16 Screw groove 16a, 16b Screw groove

18 Material outlet

20a, 20b Screw tip

22, 22a, 22b Supply screw base

24, 24a, 24b Connecting member 26, 26a, 26b Power shaft

28, 28a, 28b Gear

30 Motor 32 Key 34 Screw 36 Slit 38 Hole 40 Screw 42 Hole 44 Slit 46 Supply Screw Base 48 Connection Member 50 Pin 52 Supply Screw Base 54 Connection Member

58a, 58b Supply screw base 60a, 60b Notch 62 Auxiliary member 64 Connection member 66 Set screw

120a, 120b Rotation center axis

240 holes 242 keyway 244 holes

460 pin hole 480 hole 482 pin hole

540 holes

Claims (6)

In a material supply apparatus for an injection molding machine that conveys material supplied from a hopper to an injection cylinder by rotating a plurality of supply screws provided side by side,
A connecting member that connects the supply screw to a power shaft that transmits rotational force to the supply screw;
The connecting member includes a phase matching unit that connects one end of the supply screw or the power shaft in phase with each other in a rotational direction, and a coupling that can be connected to the other end of the power shaft or the supply screw at a position where the phase is free. A material supply device for an injection molding machine.   The phase matching unit has a key hole for inserting the key provided corresponding to a key and a key hole for inserting the key provided in the supply screw or the power shaft, and the supply for inserting the pin and the pin. A screw or a structure comprising a hole penetrating the power shaft and the connection member, a rotation provided in the connection member fitted into a shape portion having a detent portion provided at one end of the supply screw or the power shaft 2. The material supply device for an injection molding machine according to claim 1, wherein the material supply device has any one of a structure including a fitting hole having a stop portion.   A notch for adjusting the phase is provided in each of the plurality of supply screws or the connection member, and the phase in the rotation direction of the supply screw is adjusted by inserting an auxiliary member into the notch. The material supply apparatus of the injection molding machine as described in any one of 1 or 2.   4. The material supply apparatus for an injection molding machine according to claim 1, wherein each of the power shafts is driven by a single motor via a synchronization mechanism. 5.   The material supply device for an injection molding machine according to any one of claims 1 to 3, further comprising a motor for driving each of the power shafts, wherein the motors are synchronously controlled.   The material supply device for an injection molding machine according to any one of claims 1 to 3, further comprising a motor for driving each of the power shafts, wherein the power shafts are synchronized via a synchronization mechanism.

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