JPH08118438A - Screw mounting mechanism of injection molding machine - Google Patents

Abstract

PURPOSE: To provide a screw mounting mechanism, by which the attaching and detaching work of a large number of setscrews is unnecessary and the simple and quick attaching and detaching work can be performed even when no allowance is present between a screw mounting part and an injection cylin der. CONSTITUTION: All the operations necessary for attaching and detaching a screw 1 is made possible in the plane normal to the shaft of the screw 1 by providing a sliding member 11, which can move only in the plane normal to the shaft of the screw 1, at the screw mounting part 5 of a screw driving member and engaging a peripheral groove 2 at the basic part of the screw 1 with the tip part 15 of the sliding member 11 for fixing the screw 1, resulting in realizing the easy attaching and detaching work of the screw 1, even when no allowance is present between the screw mounting part 5 and an injection cylinder 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of a screw mounting mechanism of an injection molding machine.

[0002]

2. Description of the Related Art The screw mounting mechanism of an injection molding machine is
1A is a front view, FIG. 1B is a side sectional view, and FIG.
As shown in the rear view of the spline bush in (c), the split rings 3 and 3 which are split to fit in the circumferential groove 2 provided in the base of the screw 1, and the split ring fitted in the circumferential groove 2 A spline bush 4 for integrally fixing the screws 3, 3 to the base of the screw 1, and a screw mounting portion 5 of the screw drive member for the spline bush 4.
It is generally constituted by a set screw 6 for fixing to a screw, and normally, a small-diameter through hole 8 having a boss fitted to the spline 7 at the base of the screw 1 is provided at the center of the spline bush 4. A large-diameter hole 9 for axially supporting the base portion of the screw 1 into which the split rings 3, 3 are fitted by a step portion between the screw 1 and the through hole 8 is concentrically provided.

At the time of installation, the spline bush 4 is passed through the screw 1 in advance, the split rings 3 and 3 are fitted to the base of the screw 1, and then the spline bush 4 is displaced toward the base of the screw 1. By fixing the bush 4 to the screw mounting portion 5 of the screw driving member with the set screw 6, the rear end surface of the screw 1 is supported on the screw mounting portion 5 side,
At the same time, the spline bush 4 spline-fitted to the screw 1 and the set screw 6 for stopping the spline bush 4 prevent the screw 1 from rotating with respect to the screw mounting portion 5 and from coming off in the axial direction.

In general, since the screw mounting portion 5 of the screw driving member is not formed with a boss that fits into the spline 7 at the base of the screw 1, all the twisting force acting when the screw 1 is rotationally driven is the spline bush. 4 acts on the set screw 6 for fixing the screw mounting portion 5 to each other, and as a result, a large number of set screws 6 (usually 4 to 6) are provided on the outer peripheral portion of the spline bush 4 in order to maintain strength. It is necessary to deploy them along concentric circles.
Also, the tip of the set screw 6 must be screwed into the screw mounting portion 5 with a corresponding depth.

Of course, when removing the screw 1 for inspection or replacement, the split rings 3 and 3 connecting the base of the screw 1 and the spline bush 4 must be removed and the screw 1 must be pulled out from the spline bush 4. However, since the split rings 3 and 3 are constrained from the outside by the inner peripheral surface of the large-diameter hole 9 of the spline bush 4, first, the set screws 6 are removed and the spline bush 4 and the screw mounting portion 5 are removed. It is necessary to release the fastening and move the spline bush 4 to the tip side of the screw 1 to remove the split rings 3 and 3 from the circumferential groove 2 at the base of the screw 1.

As already mentioned, this work is very troublesome because of the large number of setscrews 6 and the fact that the tips thereof are deeply screwed into the screw mounting portion 5.

Moreover, since the tip of the set screw 6 is deeply screwed into the screw mounting portion 5, a corresponding working space is provided in front of the spline bush 4 in order to release the set screw 6 and remove the set screw 6. Although it is necessary to secure the space, the base of the injection cylinder 10 is actually located at this portion, so it is difficult to secure a sufficient working space. Naturally, by design, a minimum required space for removing the setscrew 6 is secured between the base of the injection cylinder 10 and the spline bush 4, but the screw 1 is kept moving forward. If the screw 1 is fixed to the injection cylinder 10 due to solidification of the residual resin in this state, the backward movement of the screw driving member having the screw mounting portion 5 becomes impossible, and as a result, it is necessary for the work. In many cases, it is necessary to heat the injection cylinder 10 to melt the resin and then retract the screw mounting portion 5 to restart the work, which is very inconvenient. .

Further, since the set screw 6, the spline bush 4, the split ring 3 and 3 are completely removed from the screw mounting portion 5 and the screw 1 to perform the detaching work, these parts are lost during the work. I was afraid.

[0009]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned drawbacks of the prior art and to eliminate the work of attaching and detaching a large number of setscrews, and to install the screw mounting portion of the screw driving member and the injection. To provide a screw mounting mechanism for an injection molding machine that enables easy and quick screw mounting / dismounting without worrying about loss of parts even when there is no space between the cylinder and the cylinder. is there.

[0010]

DISCLOSURE OF THE INVENTION The present invention comprises a sliding member which is provided in a screw mounting portion of a screw driving member, is movable in a plane orthogonal to the screw axis, and is disengaged from a recess or hole in the screw base. The above-mentioned object is achieved by a configuration characterized in that it is provided with a fixing means for fixing the sliding member at a position where the sliding member engages with the recess or hole.

Further, by providing the fixing means at the outer end of the screw mounting portion, the fixing work of the sliding member can be performed more easily.

In the screw mounting mechanism as one embodiment, the screw driving member has a shape that is slidably fitted in a guide groove in the screw radial direction provided in the screw mounting portion of the screw driving member and engages with the recess or hole of the screw base at its tip. A sliding member is formed by a rod-shaped body having the other end extended to the outer end of the screw mounting portion, and the sliding is performed at a position where the tip of the sliding member engages with the recess or hole. The fixing means was constituted by a set screw at the outer end of the screw mounting portion for non-slidably fixing the member to the screw mounting portion.

Further, by forming an elongated hole in the longitudinal direction at the other end of the sliding member, the sliding member can be slid with the set screw attached to the outer end of the screw mounting portion. In this way, the screw can be attached and removed more smoothly and the parts are reliably prevented from being lost.

The slot is formed to be narrower than the diameter of the head of the set screw, and a counterbore for embedding the head of the set screw is formed at the end of the slot so that the head of the set screw and the counterbore are formed. By the interference, the screw driving member is strongly rotated and centrifugal force is exerted by securely fixing the sliding member to the screw mounting portion at a position where the tip of the sliding member engages with the recess or hole. Even in this state, the engagement between the sliding member and the screw base can be ensured.

The sliding member and the screw base are engaged with each other by providing the other end of the sliding member with a sliding assist operation concave portion or a convex portion for hooking an L-shaped small diameter hexagon wrench or the like. Can be easily released.

Furthermore, by disposing a plurality of sets of the sliding member and the fixing means at a predetermined angular pitch in the screw rotation direction, the engagement state between the sliding member and the screw base portion can be more reliably maintained. .

[0017]

The sliding member is moved in the plane orthogonal to the screw axis to engage and disengage the sliding member with the recess or hole in the screw base, and the screw is detached. Since the sliding member can move only in the plane orthogonal to the screw axis, the screw does not move in the axial direction if the sliding member is moved to engage with the recess or hole in the screw base. After the sliding member is engaged with the recess or hole of the screw base, the position of the sliding member is fixed by the fixing means, and the screw is securely fixed to the screw mounting portion. Further, when removing the screw, the fixing means is released and the sliding member is moved, the sliding member is disengaged from the recess or hole of the screw base, and the screw is axially pulled out from the screw mounting portion. Since all the operations required for screw attachment / detachment are performed in a plane orthogonal to the screw axis, the screw attachment / detachment work can be easily performed even when there is no margin between the screw attachment portion and the injection cylinder. Further, the force for moving the sliding member for fixing the screw in the screw axial direction is received by the sliding member itself which can move only in the plane orthogonal to the screw axis, and is not transmitted to the fixing means. Therefore, the fixing means does not have to support a strong force acting in the screw axial direction, and it is not necessary to use a large number of bolts or the like to strengthen the fastening force. The required work can be done in a short time, and the screw can be easily attached and detached.

Since this fixing means is provided at the outer end of the screw mounting portion, there is no interference with the injection cylinder base and the like, and the fixing and releasing operations can be easily performed.

In the screw mounting mechanism as one embodiment, the sliding member is formed by a rod-shaped body having a shape that engages with the concave portion or hole of the screw base portion at the tip portion, and the sliding member is the screw mounting portion. It is slidably fitted in the guide groove and allowed to slide only in a plane orthogonal to the screw axis. Also, when installing the screw,
The other end of the sliding member is non-slidingly fixed to the screw mounting portion by a set screw provided at the outer end portion of the screw mounting portion. As described above, the force for moving the sliding member that fixes the screw in the axial direction of the screw is received by the sliding member itself that is movable only in the plane orthogonal to the screw axis. That is, in this embodiment, the force acting in the screw axial direction directly acts on the screw mounting portion via the sliding member,
There is no transmission to the set screw that constitutes the fixing means. Therefore, the set screw does not have any function required to have strength such as supporting the screw in the axial direction, and the number thereof may be small. The work is extremely easy and can be done in a short time.

Further, by forming an elongated hole in the longitudinal direction at the other end of the sliding member made of a rod-shaped member, the sliding member is slid with the set screw attached to the outer end of the screw mounting portion. Since it is possible, it is not necessary to remove the parts around the mounting part when attaching and detaching the screw,
The loss of parts is reliably prevented. In this case, the screw attachment / detachment work is performed by loosening the set screw and moving the sliding member.

Further, in the slotted hole provided with the counterbore for embedding the head of the setscrew at the end, in the state where the tip of the sliding member is engaged with the recess or hole of the screw base, The head of the set screw provided at the end is buried in the position of the counterbore, the position of the sliding member is completely regulated by the interference between the head of the set screw and the counterbore, and the rotation of the screw mounting portion It is possible to prevent the sliding member from being displaced due to centrifugal force or the like. When removing the screw, loosen the set screw, remove the head from the spot facing, and move the moving member along the slot to release the engagement between the sliding member tip and the screw base. Let

The concave portion or convex portion for sliding auxiliary operation provided on the other end of the sliding member can be pulled out or pushed in the screw radial direction outside by hooking an L-shaped small diameter hexagon wrench or the like. It is used when engaging and disengaging the screw base and the sliding member.

By disposing a plurality of sets of the sliding member and the fixing means at a predetermined angular pitch in the screw rotation direction, the engagement state between the sliding member and the screw base can be more reliably maintained. The reason why they are evenly arranged at a predetermined angular pitch is to prevent the generation of a biased force around the axis when the screw drive member rotates.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a screw mounting mechanism to which the present invention is applied will be described below with reference to FIG. Figure 2
(A) is a front view of the screw mounting mechanism of the present embodiment as seen along the screw 1, FIG. 2 (b) is a side sectional view thereof, and FIG. 2 (c) is a spline bush forming a part of the screw mounting mechanism. It is a rear view which shows 4'from a back side.

As shown in FIG. 2B, the main parts of the screw mounting mechanism of this embodiment are the screw mounting portion 5 of the screw driving member, the peripheral groove 2 provided in the base of the screw 1, and It is composed of rod-shaped sliding members 11, 11 for engaging with the circumferential groove 2 and fixing the base portion of the screw 1 to the screw mounting portion 5.

The screw mounting portion 5 of the screw driving member comprises a screw sleeve 12 for supporting the rear end surface of the screw 1 and transmitting the injection pressure, and a screw rotation pulley 13 located on the outer periphery of the screw sleeve 12. It is substantially integrated with the screw rotating pulley 13 and is rotatably attached to a pusher plate (not shown) located behind it, that is, on the right side in FIG. 2B. That is, during the injection operation, the pusher plate is moved forward to integrally push out the screw sleeve 12 and the screw rotation pulley 13 to cause the screw 1 fixed to the screw mounting portion 5 to perform the injection operation. , Screw 1
When the rotation of the screw is required, the screw driving pulley 13 and the screw sleeve 12 are integrally rotated through a timing belt or the like by the rotation driving means integrally attached to the pusher plate, and the screw is rotated. The screw 1 fixed to the mounting portion 5 is rotated.

The external shape of the spline bush 4'is substantially the same as that of the spline bush 4 as described in the conventional example shown in FIG. 1, but the spline bush 4'is fitted to the spline 7 at the base of the screw 1. Only the small-diameter through hole 8 having the boss is provided, and the large-diameter hole for fixing the split ring and the like from the radial outside of the screw 1 is not provided.

Instead, on the back surface of the spline bush 4 ', as shown in FIG. 2 (c), guide grooves 14, 14 for holding the rod-shaped sliding members 11, 11 are provided in the diametrical direction thereof. , Are engraved in the radial direction of the screw 1. Similar to the conventional example shown in FIG. 1, the spline bush 4'is fixed to the front surface of the screw sleeve 12 of the screw mounting portion 5 by, for example, four setscrews 6, and further, the guide grooves 14 and 14 and the screw sleeve 1 are provided.
In the space formed between the front surface of 2 and the front surface of
Reference numerals 1 and 11 are slidably fitted as shown in FIG. That is, the sliding members 11 and 11 can move only in a plane orthogonal to the axis of the screw 1, and never move in the axial direction of the screw 1.

Unlike the conventional example shown in FIG. 1, the spline bush 4'is always fixed to the front surface of the screw sleeve 12 by four setscrews 6, and It should not be removed each time it is removed. It should be noted that the spline 7 of the screw 1 is fitted into a boss having a small-diameter through hole 8 to prohibit rotation of the screw 1 with respect to the spline bush 4 ', and the four set screws 6 are used to interpose the spline bush 4'. The rotational movement of the screw mounting portion 5 is transmitted to the screw 1 in the same manner as in the conventional example of FIG.

Further, the distal end portion 15 of the sliding member 11 is provided with a partial arcuate shape which engages with the circumferential groove 2 provided in the base portion of the screw 1, and the other end portion serves as a fixing means. A long hole 17 is formed in the longitudinal direction for loosely fitting the threaded portion of the set screw 16, and the outer end of the long hole 17 has
A counterbore 18 is provided for sinking the head of the set screw 16. A hexagon socket head cap screw is generally used as the set screw 16, but a short sleeve or the like suitable for the spot facing diameter is welded to the base of the hexagon head cap bolt and used in place of the hexagon socket head cap screw. You may do it. In short, the set screw 16 with the head of the set screw 16 or a short sleeve replacing the set screw fitted in the spot facing 18
It suffices that the fastening and unfastening operations can be performed. The front view of FIG. 2D and the side sectional view of FIG. 2E show the shapes of the slot 17 and the spot facing 18 with the set screw 16 removed.

In response to this, on the front surface of the screw rotating pulley 13 located at the outer end of the screw mounting portion 5,
As shown in FIG. 2B, the tip portion 1 of the sliding member 11
A female screw 19 for screwing the set screw 16 is threaded at a position corresponding to the position of the spot facing 18 when the screw 5 is completely engaged with the circumferential groove 2 of the screw 1. Sliding member 1
The through hole 20 provided at the extreme end of 1 is a through hole as a recess for sliding assist operation, and the alternate long and short dash line in FIG. 2B is located at the base of the cylinder 10, that is, in front of the screw mounting portion 5. Fig. 3 shows an obstacle on the detaching work.

In the operation of removing the screw 1 in the above construction, first, the set screw 1 as a fixing means is used.
Loosen the fastening of 6, 16 moderately and spot the head 18,
18 so that the sliding members 11 and 11 are guided into the guide groove 1.
4 and 14, the screw 1 is allowed to move freely in the radial direction, and the sliding members 11, 11 are pulled outward in the radial direction to engage the tips 15 and 15 thereof with the circumferential groove 2 of the screw 1. Solve At this time, the set screws 16 and 16 and the female screw 1
It is not necessary to completely unscrew the screws 9 and 19 and set screw 1
If even the heads of 6, 16 are removed from the spot facings 18, 18, the sliding operation of the sliding members 11, 11 becomes possible within a predetermined range regulated by the elongated holes 17, 17. Therefore,
After completely removing the set screws 16 and 16, the sliding member 1
There is no need to move 1, 11 and the set screws 16, 16
Can be prevented from being lost.

Further, the sliding member 11, the tip portion 15 of the 11,
Even if the sliding members 11, 11 are further pulled after the engagement between the screw 15 and the circumferential groove 2 of the screw 1 is released, the elongated holes 17, 1
At the position where the other end of 7 hits the screw part of the set screws 16, 16, further withdrawal operation is automatically prohibited.
The sliding members 11 and 11 themselves are not completely pulled out, and the sliding members 11 and 11 are prevented from being lost. Further, in the case where a sufficient force required for the disengagement movement cannot be obtained only by pinching the other end of the sliding members 11, 11, the through hole 20 as the recess for sliding assist operation is formed. Insert one end of an L-shaped small-diameter hexagon wrench or the like into this and pull it strongly to move the sliding members 11, 11.

Since the screw mounting portion 5 consisting of the screw sleeve 12 and the screw rotating pulley 13 can be manually rotated by holding the outer periphery of the pulley 13, any one of the sliding members 11 can be operated by the operator. If the operation is performed so that it comes to the front of the sliding member 1,
The disengagement work of 1 and 11 is easy. Sliding member 11,
11 is pulled outward in the radial direction to disengage the tips 15 and 15 thereof from the circumferential groove 2 of the screw 1, and then the screw 1 is screwed onto the screw sleeve 12 and the spline bush 4 '.
The screw 1 can be easily removed from the screw mounting portion 5 by pulling out the screw 1.

As described above, according to this embodiment, it is not necessary to remove the screw 1 after removing the spline bush 4'corresponding to the conventional spline bush 4. Therefore, it is not necessary to remove a large number of setscrews 6 whose effective screw portions are long and firmly fastened, and the screw 1
The removal work of can be performed extremely smoothly. Moreover, since the screw 1 can be freely pulled out only by moving the sliding members 11, 11 in the radial direction of the screw 1, a sufficient space is not secured between the screw mounting portion 5 and the injection cylinder 10. Even in such a case, the screw 1 can be easily removed (when using the spline bush 4 and the split rings 3 and 3, remove the set screw 6 and remove the spline bush 4 to remove the split rings 3 and 3. A sufficient working space is required in front of the screw mounting portion 5 because it needs to be taken out). Also,
Since the setscrews 16 and 16 which are fixing means are provided at the outer ends of the screw mounting portions 5, the setscrews 16 and 1 are
The work of loosening 6 can be easily performed without being interfered by the injection cylinder 10.

On the other hand, when the screw 1 is mounted, it is first confirmed that the tip portions 15, 15 of the sliding members 11, 11 are sufficiently retracted to the outside in the radial direction of the spline bush 4 '. If the other ends of the elongated holes 17, 17 in the sliding members 11, 11 are in contact with the threaded portions of the set screws 16, 16, the retracting of the tip portions 15, 15 is sufficient, but in other cases, the sliding members are newly anew. 11 and 11 are pulled outward in the radial direction, and the other ends of the long holes 17 and 17 are set screws 16 and 16 respectively.
The sliding members 11 and 11 are moved until they hit the threaded portion of.

Then, the concavity and convexity of the spline 7 in the screw 1 are matched with the concavity and convexity of the boss of the spline bush 4'and the base of the screw 1 is inserted into the spline bush 4 ', and the rear end surface of the screw 1 is screw sleeve 1
Push in until it touches 2. Then, the positioning of the screw 1 in the axial direction is completed, and the positions of the circumferential groove 2 on the screw 1 and the positions of the tip portions 15, 15 of the sliding members 11, 11 match within a plane orthogonal to the axis of the screw 1. . Therefore, the operator holds the other end of the sliding member 11, 11 and pushes it toward the screw 1 to engage the partially arcuate portion of the tip end 15, 15 with the circumferential groove 2 of the screw 1. After fixing the screw 1 in the axial direction, the set screws 16 and 16 as fixing means are completely screwed into the female screws 19 and 19 of the screw rotation pulley 13 to set screws 16 and 16.
The head of the slide member 11 is buried in the counterbore 18, 18 of the slide member 11, 11 to fix the slide member 11, 11 to the screw mounting portion 5 in a non-sliding manner.

As a result of the positions of the spot facings 18, 18 being restricted by the heads of the set screws 16, 16, the sliding members 11, 1 are
The sliding members 11, 11 do not move even if a force for moving the screw 1 outward in the radial direction acts during screw rotation, and the tip portions 15, 15 of the sliding members 11, 11 and the circumferential groove of the screw 1 are not moved. The engagement relationship with 2 can be reliably retained. The fixing of the screw 1 in the axial direction when using the injection molding machine is extremely firm.

Further, the force acting in the axial direction of the screw 1 is directly transmitted to the rear surface of the spline bush 4'or the front surface of the screw sleeve 12 through the tip portions 15 and 15 of the sliding members 11 and 11, so that the sliding force is reduced. In any case, the force that pulls the other end of the moving members 11, 11 away from the front surface of the screw rotation pulley 13 does not act at all. Therefore, the set screws 16 and 1 as fixing means
It is not necessary to firmly fix the sliding members 11, 11 to the screw rotation pulley 13 by means of 6, and it is possible to simply prevent the sliding members 11, 11 from moving in the radial direction by the rotation of the screw mounting portion 5 during measurement. Since it is sufficient to have the strength to the extent possible, naturally the number of deployment is also small (in the embodiment, one is provided on one side). As a result, the number of setscrews that must be manipulated when removing and installing the screw 1 is small, and the overall working time required for removing and installing the screw 1 is greatly reduced.

That is, in this embodiment, the sliding member 1
Spline bush 4'with tip parts 15 and 15 of 1 and 11
A large number of setscrews 6 and sliding members 11, 11 required to support a strong force received from the screw 1 via
Since the set screw 16 as the fixing means for fixing the position of is completely different from the set screw 16, the number of the set screws 16 for fixing the positions of the sliding members 11, 11 is small, and the work efficiency is improved. (In the conventional example shown in FIG. 1, since a large number of setscrews 6 required to have strength also serve as both, it is required to remove and attach all setscrews 6 when attaching and detaching the screw 1, and work efficiency deteriorates).

As described above, according to this embodiment, even when the screw 1 is attached, the set screw 6 for fixing the spline bush 4'is not required to be attached or detached, and the screw attachment portion 5 and the injection cylinder 10 are not required. Even if you don't have enough space between
The screw 1 can be easily attached.

Some examples of the present invention will be listed below as examples. First, the sliding member 11 and the guide groove 1 are applied by applying the same configuration as that of the embodiment shown in FIG.
4, a large number of sets of setscrews 16 and female screws 19 as fixing means can be arranged on the screw mounting portion 5 at a predetermined angular pitch in the rotation direction of the screw 1, 3, 4 ,. There is no particular advantage in providing only one set of the sliding member 11, the guide groove 14, the set screw 16, and the female screw 19, but an appropriate mass balance (counterweight) is provided on the screw mounting portion 5. By doing so, the implementation itself is possible.

Further, sliding members 11 and 1 as shown in FIG.
1 is provided as a slide member, and a keyhole-shaped through hole is formed in the central portion thereof, the groove 2 of the screw 1 is supported by the small diameter portion of the through hole, and the sliding member is slid. In this state, the base portion of the screw 1 can be configured to be removed through the large diameter portion of the through hole. Obviously, the outer shape is similar to that shown in FIG. 2A when viewed from the front, but in this case, since the sliding member is integrated, the elongated hole 17, the through hole 20, the set screw 16, and the female screw 19 are slid. It is sufficient if it is installed on one end side of the moving member. In the embodiment shown in FIG. 2, the two sliding members 11, 11 located at 180 ° opposite positions.
However, according to the embodiment presented here, the operation is required only once, which is convenient in terms of work. Of course, all that has to be manipulated is one set screw 16 as a fixing means. The sliding member 1
Even in the example shown in FIG.
By disposing a linkage mechanism including a bell crank and the like on the screw mounting portion 5 and engaging the sliding members 11 and 11, the sliding member 11 on one side is operated to synchronize the sliding member 11 on the other side. It is possible to move it.

Further, instead of the set screw 16 as the fixing means, a biasing means such as a spring is provided between each of the sliding members 11 and 11 and the spline bush 4 ', so that the sliding members 11 and 11 are fixed. You may make it always urge inward in the radial direction to prevent movement due to centrifugal force. In this case, the sliding members 11, 11 are formed to be relatively short, and click stop means composed of a ball, a spring, etc. are provided at the outer end portion of the front surface of the screw rotating pulley 13, while the sliding member 1
A center hole-shaped concave portion that fits the ball is formed on the back surface of the outer end portions of the sliding members 1 and 11 so that their positions can be maintained when the sliding members 11 and 11 are pulled out radially outward. deep. This is to maintain the disengaged state between the tip portion 15 and the circumferential groove 2 when the screw 1 is attached and detached. Although the manufacturing cost increases, there is an effect that the operation of the set screw becomes unnecessary.

Of course, other concave shapes or holes may be used instead of the circumferential groove 2 as a means for fixing the screw 1, and the shape of the tip portion 15 of the sliding member 11 may be arbitrarily changed in accordance with it. You can do it. The sliding member 11 is the screw 1
It is necessary to be able to move only in a plane orthogonal to the axis of, but the moving direction does not necessarily have to be the direction along the radial direction of the screw 1. Alternatively, the tip end portion 15 side of the sliding member 11 may be disposed so as to be displaced from the center of the screw mounting portion 5, and the tip end side portion of the sliding member 11 may be engaged with the groove 2 to secure the screw 1. It may be fixed.

[0046]

The screw mounting mechanism of the injection molding machine according to the present invention fixes the screw by engaging the sliding member movable only in the plane orthogonal to the screw axis with the recess or hole of the screw base. Since all the operations required for screw attachment / detachment can be performed in the plane orthogonal to the screw axis, screw attachment / detachment is possible even when there is no space between the screw mounting part and the injection cylinder. Work can be performed easily.

Since a strong force acting in the screw axial direction does not act on the fixing means for fixing the sliding member, it is not necessary to use a large number of bolts or the like as the fixing means, and the spline bush is fixed. Therefore, the screw attaching / detaching work can be performed in a much shorter time than the conventional screw mounting mechanism in which a large number of set screws required for removing the screws are attached and detached. Moreover, since the fixing means is provided at the outer end of the screw mounting portion, there is no interference with the injection cylinder base and the like, and the fixing and releasing operations can be performed easily.

Further, by forming an elongated hole in the longitudinal direction at the end of the sliding member, the sliding member is slid with the set screw provided as a fixing means attached to the outer end of the screw mounting portion. Since this is possible, it is not necessary to remove the parts around the screw mounting portion when the screw is attached and detached, and the parts are reliably prevented from being lost. Also,
Since the end of the long hole is provided with a spot facing for embedding the head of the set screw to fix the position of the sliding member, the sliding member should be engaged with the recess or hole of the screw base. The position of the sliding member can be reliably regulated, and the displacement of the sliding member due to the centrifugal force or the like caused by the rotating operation of the screw mounting portion can be completely prevented.

Further, since the slide assisting operation concave portion or convex portion is provided at the end portion of the sliding member so that an auxiliary tool such as an L-shaped small diameter hexagon wrench can be hooked, the hand slips with oil or the like. Even when it is difficult to grip the sliding member, the sliding member can be easily moved to engage and disengage with the recess or hole of the screw base.

Since a plurality of sets of the sliding member and the fixing means are arranged at a predetermined angular pitch in the screw rotation direction, the engagement state between the sliding member and the screw base can be more surely maintained. Moreover, even if the screw mounting portion is rotated, there is no fear of causing eccentric movement due to the deviation of the center of gravity.

[Brief description of drawings]

FIG. 1 is a diagram showing a conventional example of a screw attachment mechanism.

FIG. 2 is a diagram showing a screw attachment mechanism according to an embodiment of the present invention.

[Explanation of symbols]

 1 Screw 2 Circumferential Groove 4'Spline Bushing 5 Screw Mounting Part 6 Set Screw 7 Spline 8 Through Hole 10 Injection Cylinder 11 Sliding Member 12 Screw Sleeve 13 Screw Rotating Pulley 14 Guide Groove 15 Tip Part 16 Set Screw as Fixing Means 17 Slotted hole 18 Counterbore 19 Female screw 20 Through hole

Claims (8)

[Claims] 1. A sliding member, which is provided in a screw mounting portion of a screw driving member, is movable in a plane orthogonal to a screw axis and engages and disengages with a recess or hole in a screw base, and the sliding member has the recess or hole. A screw mounting mechanism for an injection molding machine, comprising: a fixing unit that fixes the sliding member at a position that engages with the screw. 2. The screw mounting mechanism for an injection molding machine according to claim 1, wherein the fixing means is provided at an outer end portion of the screw mounting portion. 3. The screw drive member is slidably fitted in a screw radial guide groove provided in a screw mounting portion of the screw drive member, and has a shape in which a tip end thereof is engaged with a recess or hole of a screw base portion, and the other end is screwed. A rod-shaped sliding member that extends to the outer end of the mounting portion, and the sliding member is non-slidingly fixed to the screw mounting portion at a position where the tip of the sliding member engages with the recess or hole. A screw mounting mechanism for an injection molding machine, comprising a fixing means. 4. The screw mounting mechanism for an injection molding machine according to claim 3, wherein the fixing means is constituted by a set screw provided at an outer end portion of the screw mounting portion. 5. The sliding member can be slid with the set screw attached to the outer end of the screw mounting portion by forming a long hole in the longitudinal direction at the other end of the sliding member. The screw mounting mechanism of the injection molding machine according to claim 4, wherein 6. The slotted hole is formed to be narrower than the diameter of the head of the setscrew, and a counterbore for embedding the head of the setscrew is formed at the end of the slot, and the head of the setscrew and the counterbore are formed. The injection molding machine according to claim 5, wherein the sliding member is securely fixed to the screw mounting portion at a position where the tip of the sliding member engages with the recess or hole due to interference. Screw mounting mechanism. 7. The sliding assist operation concave portion or convex portion for hooking an L-shaped small diameter hexagon wrench or the like is provided on the other end portion of the sliding member. The screw mounting mechanism of the injection molding machine according to claim 5 or 6. 8. A plurality of sets of the sliding member and the fixing means are arranged at a predetermined angular pitch in the screw rotation direction, claim 1, claim 2, claim 3, claim 4, claim 4. 5, The screw mounting mechanism of the injection molding machine according to claim 6 or 7.