JPH0939032A - Injection unit turning mechanism of injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection unit turning mechanism wherein a wide working space is not required when an injection screw is exchanged. SOLUTION: A pin 19 which connects an injection unit 1 to an extruder base 10, and an arcuate groove 18 are provided on a lower surface of a rear plate 3 positioned to a rear end part side of the injection unit 1 and on an upper surface of the extruder base 10 to lengthen a distance from a center of turning to a tip of an injection cylinder 7. Thereby, an angle of rotation of the injection unit 1 required for separation of a tip of the injection cylinder 7 from a rear surface of a stationary platen 9 to its side direction is decreased, and when an injection screw 6 is drawn out from the tip of the injection cylinder 7, a tip of the injection screw 6 comes not to be largely projected to a side of an injection molding machine. Since the injection screw 6 can be exchanged in a narrow space, closely contact arrangement of the injection molding machine can be carried out.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art An injection unit is rotatably mounted on an extruder base, and the injection unit is rotated to disengage the tip of the injection cylinder laterally from the rear surface of the stationary platen to attach and detach the injection screw from the tip side of the injection cylinder. An injection molding machine adapted to perform is already known.

FIG. 4 and FIG. 5 show the outline of the structure.
FIG. 4 is a side view showing a conventional injection unit turning mechanism, and FIG. 5 is a plan view thereof.

As shown in FIGS. 4 and 5, an injection unit 100 of an injection molding machine is generally provided with a front plate 102, a rear plate 103, and a screw which integrally fixes the front plate 102 and the rear plate 103. The pusher plate 104 is slidably attached to the tie rod 105, and the front plate 102 has an injection cylinder 101 fixed thereto.

Of course, the screw pusher plate 10
4 is equipped with a screw rotation mechanism that rotationally drives the injection screw 106, and the rear plate 103 is provided with an injection drive mechanism that linearly drives the screw pusher plate 104 along the tie rod 105.
Here, the ball screw 1 that constitutes a part of the injection drive mechanism
07 is described but the description of other parts is omitted.

A pivot pin 109 is provided between the center of the tip of the injection unit 100 and the extruder base 108, that is, between the center of the lower surface of the front plate 102 and the upper surface of the extruder base 108, and the extruder base 108 is provided. Injection unit 10 on
The structure is such that 0 can freely rotate.

The turning function of the injection unit 100 is such that fine adjustment of the left and right when the center of the nozzle 110 attached to the tip of the injection cylinder 101 is aligned with the sprue bush of the mold, and the tip of the injection cylinder 101 is the stationary platen 111. It is used when the injection screw 106 is detached from the back surface of the injection roller sideways and the injection screw 106 is attached and detached from the tip side thereof. Of course, it is necessary to remove the nozzle 110 from the injection cylinder 101 when attaching and detaching the injection screw 106.

Normally, the injection unit 100 is integrally fixed on the extruder base 108 by a bolt 113 which is passed through a through hole of a stay 112 provided at the base of the front plate 102 from above, and is attached to the main body of the injection molding machine. The injection unit 100 is moved to the extruder base 108 by the feeding operation of the nozzle touch mechanism 114 provided.
The nozzle touch or sprue break operation is performed by moving integrally with the injection axis direction.

Further, the through hole of the stay 112 has a bolt 11
3 is in a loosely fitting relationship with the male screw portion, and even if the bolt 113 is inserted into the stay 112, the pivot pin 1
It is possible to finely rotate the injection unit 100 around the center of 09, that is, finely adjust the center of the nozzle 110 to the sprue bush of the mold. After the completion of this fine adjustment, the stay 112 is pressed against the extruder base 108 by the head of the bolt 113 by tightening the bolt 113, and the injection unit 100 and the extruder base 108.
And are completely fixed, and the nozzle touch or sprue break operation described above is performed in this state.

As described above, when replacing the injection screw 106, it is necessary to separate the tip of the injection cylinder 101 laterally from the rear surface of the stationary platen 111 to pull out the injection screw 106. Thus, the injection unit 100 must be swung largely. Therefore, in this case, the bolt 113
Remove the stay 112 and the extruder base 10
After releasing the engagement of 8, the injection unit 100 is swung largely by swinging the injection cylinder 101 to the side.

However, as shown in FIGS. 4 and 5, in the structure in which the pivot pin 109 is provided in the center of the lower surface of the front plate 102 to rotate the injection unit 100, the injection cylinder 10 is moved from the position of the pivot pin 109.
Since the distance L to the tip of No. 1 is short, in order to laterally separate the tip of the injection cylinder 101 from the back surface of the stationary platen 111, the injection unit 100 must be rotated considerably considerably. The rotation angle at this time is shown in FIG.
Is indicated by θ.

When the injection screw 106 is actually attached or detached, a working space equal to the entire length of the injection screw 106 is required in front of the injection cylinder 101 with reference to the tip of the injection cylinder 101. .
Briefly, the substantial working space required at this time is a rectangular region formed on the side of the injection molding machine with the sum of the entire lengths of the injection cylinder 101 and the injection screw 106 being one of the diagonal lines, In short, it is a space as shown by the chain double-dashed line in FIG. Injection cylinder 101 and injection screw 1
If the sum of the total length of 06 is X, the length of one side a of this region is approximately X sin θ, and the length of the other side b is X cos θ.

Therefore, the larger the value of θ, the larger the value of a in proportion to this, and in the case where a plurality of injection molding machines are arranged side by side, the injection screw 10
When 6 is removed, there is a risk that the tip of the injection screw 106 interferes with the adjacent injection molding machine, and there arises a problem that the arrangement pitch of the injection molding machine at the molding work site is limited.

[0014]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned drawbacks of the prior art and to replace a large number of injection molding machines at the molding work site without requiring a large working space when replacing the injection screw. It is to provide an injection unit turning mechanism that can be installed and deployed.

[0015]

SUMMARY OF THE INVENTION According to the present invention, the center of the tip of an injection unit is pivotally supported on an extruder base via a removable pivot pin, and the rear end of the injection unit and the extruder base are provided. Between the two are connected by a fitting means that allows the turning operation of the injection unit about the rear end of the injection unit and the minute turning operation of the injection unit about the pivot pin position. The above-mentioned object was achieved by.

First, in fine adjustment when aligning the center of the nozzle attached to the tip of the injection cylinder with the sprue bush of the mold, the center of the tip of the injection unit is pivotally supported on the extruder base via the pivot pin. The injection unit is slightly swung around the pivotal position to swing the tip of the injection cylinder laterally, and the center of the nozzle is aligned with the sprue bush of the mold. Since the fitting means provided on the rear end side of the injection unit is configured to allow the micro-rotation operation of the injection unit about the pivot pin position, the rotation of the injection unit about the pivot pin position. It does not interfere with the operation. In addition,
This pivot pin is located in the center of the tip of the injection unit because it is necessary to hold the injection unit on the extruder base against the nozzle touch force and resin reaction force transmitted to the injection unit via the injection cylinder and the injection screw. It must be provided and cannot be omitted.

When the injection screw is removed from the injection cylinder, the pivot pin is removed from between the center of the tip of the injection unit and the extruder base, and the pivot pin is provided between the rear end of the injection unit and the extruder base. The injection unit is swung largely around the fitting means, and the tip of the injection cylinder is laterally disengaged from the back surface of the stationary platen. Since the fitting means that serves as the center of rotation is provided on the rear end side of the injection unit, the distance from the center of rotation to the tip of the injection cylinder becomes long, and the injection unit is centered around the pivot pin at the center of the tip of the injection unit. The rotation angle of the injection unit required to laterally separate the tip of the injection cylinder from the back surface of the stationary platen can be made smaller than in the case of turning. As a result, when the injection screw is replaced, the injection cylinder and the injection screw do not largely project to the side of the injection molding machine, and the work space required is reduced. It becomes possible to laterally deploy the injection molding machine (above, claim 1).

The fitting means provided between the rear end of the injection unit and the extruder base is an arcuate groove formed on one of the lower surface of the rear end of the injection unit or the upper surface of the extruder base with the pivot pin position as the center of curvature. It can be configured with a protrusion formed on the other side.

Since the arcuate groove is formed with the pivot pin position as the center of curvature, the turning operation of the injection unit with the pivot pin position as the turning center is allowed to some extent between the projection and the arcuate groove, and the injection is performed. The fine turning operation of the unit enables fine adjustment work of the tip end position of the injection cylinder.

Since the position of the pivot pin is provided at the center of the tip of the injection unit and the arcuate groove is provided at the rear end of the injection unit, the direction of the arcuate groove with the position of the pivot pin as the center of curvature is horizontal. Inside, the direction is substantially orthogonal to the axis of the injection cylinder, that is, it coincides with the lateral width direction of the injection molding machine. Therefore, if you remove the pivot pin,
It becomes possible to translate the injection unit on the extruder base to some extent in the lateral direction of the injection molding machine.
Therefore, if the injection unit is moved in parallel on the extruder base in the direction opposite to the swinging direction of the tip of the injection cylinder to the position where the protrusion and one end of the arcuate groove are in contact, the injection unit is swung. When the injection unit is swung, it is possible to prevent the tip end side of the injection unit from overhanging in the swinging direction from above the extruder base more than necessary, which is effective for maintaining the balance of the injection unit.

Further, the injection unit is moved in parallel on the extruder base in the direction of the swinging direction of the tip of the injection cylinder to a position where the projection contacts the other end of the arcuate groove, and then the injection unit is turned. If this is done, this parallel movement can cover a part of the movement amount of the injection cylinder tip required to separate the tip of the injection cylinder laterally from the back surface of the stationary platen, so that the tip of the injection cylinder can be covered. The rotation angle of the injection unit required for separating the stationary platen from the back side to the side can be further reduced, which is more effective in saving the working space (the above claims).

[0022]

DETAILED DESCRIPTION OF THE INVENTION An example of an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing an example of an injection unit turning mechanism to which the present invention is applied, and FIG. 2 is a plan view thereof.

A front plate 2, a tie rod 5, a rear plate 3, and a ball screw 1 which constitute the injection unit 1.
2, the stay 13, the bolt 14, the screw pusher plate 4, the injection screw 6, the injection cylinder 7, the nozzle 8, the stationary platen 9, the extruder base 10, and the nozzle touch mechanism 11 except for the details, and FIG. And a front plate 102, a tie rod 105, a rear plate 103 in the injection unit 100 of the conventional injection molding machine described in FIG.
Ball screw 107, stay 112, bolt 113, screw pusher plate 104, injection screw 106, injection cylinder 101, nozzle 110, stationary platen 111, extruder base 1
08, the nozzle touch mechanism 114 has the same configuration as that of the nozzle touch mechanism 114.

The injection unit swivel mechanism in this embodiment differs from the conventional example shown in FIGS. 4 and 5 in that the pivot pin 15 provided at the center of the tip of the injection unit 1 is removable. The rear end side of the injection unit 1, that is, between the lower surface of the rear plate 3 and the extruder base 10, the swiveling operation of the injection unit 1 around the rear end of the injection unit 1 and the position of the pivot pin 15 are performed. The point is that a fitting means is provided which allows a minute turning motion of the injection unit 1 centered on.

First, the simplest structure that enables the attachment / detachment of the pivot pin 15 is a method in which the pivot pin 15 is an external type and, if necessary, the pivot pin 15 is attached / detached to / from the hand. Therefore, in the present embodiment, the lower portion of the front plate 2 is formed into a substantially L-shaped bent shape, a through hole 16 is bored in the center of the bent portion, and the pivot pin 15 with a collar is inserted from above. The extruder base 10 is made to project into the hole 17 at the center of the tip.

In the example shown in FIG. 1, since interference occurs between the lower surface of the base of the injection cylinder 7 and the upper surface of the flange of the pivot pin 15, the pivot pin 15 cannot be completely removed from the through hole 16, but the injection is performed. Between the lower surface of the base of the cylinder 7 and the upper surface of the flange of the pivot pin 15, the tip of the pivot pin 15 has a hole 17 on the side of the extruder base 10.
It suffices to have a clearance that allows the front plate 2 to be detached from the front plate 2 (when assembling, the pivot pin 15 is passed through the through hole 16 of the front plate 2 and then the front plate 2).
To attach the injection cylinder 7). This pivot pin 15 pivotally supports the injection unit 1 for fine adjustment when aligning the center of the nozzle 8 attached to the tip of the injection cylinder 7 with the sprue bush of the mold, and the nozzle during injection molding work. Since it also has a function of holding the injection unit 1 on the extruder base 10 against the touch force and the resin reaction force, it is necessary to provide the injection unit 1 at the center of the tip of the injection unit 1, that is, at the center of the lower surface of the front plate 2. It is suitable and not desirable to install laterally offset from the injection cylinder 7.

Of course, in addition to this, a hole 17 which is a blind hole is formed in the extruder base 10 which is relatively thick, and a coil spring is provided at the bottom of the hole so that the straight pivot pin 15 is inserted. The pivot pin 15 is made to project from the hole 17 toward the through hole 16 of the front plate 2 by the elastic force of the coil spring, and the pivot pin 15 is contracted downward by the hand inserted from above the through hole 16 to pivot the pin. There is also a method of releasing the engagement between the hole 15 and the through hole 16, but such an option is only a design problem, and in short, the hole 17 and the pivot pin 1
As long as it can be freely engaged with and disengaged from 5, the through hole 16 and the pivot pin 15, or the hole 17 and the through hole 16 and the pivot pin 15, the structure thereof does not matter.

Further, the fitting means in the present embodiment has the arcuate groove 18 formed on the upper surface of the extruder base 10 with the position of the pivot pin 15 as the center of curvature and the rear corresponding to the position of the arcuate groove 18. The pin 19 is integrally formed on the lower surface of the plate 3. Of course, the arcuate groove 18 may be engraved on the lower surface of the rear plate 3 and the pin 19 may be implanted on the upper surface of the extruder base 10. However, in the case where the rear plate 3 has a small thickness, it is necessary to improve the strength. As seen, it is more advantageous to engrave the arcuate groove 1 on the side of the extruder base 10. Further, instead of the arcuate groove 18, a simple round hole having a loose fitting relation with the pin 19, that is, a so-called stupid hole may be used.

As shown in FIG. 2, with the pivot pin 15 as the center of rotation, the injection cylinder 7 is made perpendicular to the stationary platen 9, and the pin 19 has the arc-shaped groove 1.
Since the relative disposition position of the pin 19 and the arcuate groove 18 is determined so as to be located in the central portion of the injection cylinder 8, the injection unit 1 is slightly swung from the neutral position around the pivot pin 15 to inject the injection cylinder 7 Can be shaken to some extent in the width direction of the injection molding machine. This function is exclusively used for fine adjustment when aligning the center of the nozzle 8 attached to the tip of the injection cylinder 7 with the sprue bush of the mold. Needless to say, this fine adjustment must be performed by loosening the bolt 14 to some extent as in the conventional case. Since the through hole of the stay 13 is in a loose fitting relation with the threaded portion of the bolt 14, even if the tip of the bolt 14 remains screwed into the female screw on the side of the extruder base 10, the bolt 14 is fixed to some extent. The rotating operation of the injection unit 1 around the pivot pin 15 is allowed only by loosening it.

On the other hand, when the nozzle 8 is removed and the injection screw 6 is detached from the tip side of the injection cylinder 7,
It is necessary to shake the tip of the injection cylinder 7 largely to the side and separate the tip of the injection cylinder 7 from the back surface of the stationary platen 9 to the side. This is because the stationary platen 9 interferes and the injection screw 6 cannot be pulled out. However, if the injection unit 1 is swung more than necessary at this time, the distance a of the work area as shown in FIG. 6 is increased, and therefore the tip of the injection screw 6 which is about to be pulled out from the injection cylinder 7. May interfere with the next injection molding machine. As already described in the section of the prior art, the smaller the rotation angle θ of the injection unit 1 required at this time, the better.

One method for reducing the rotation angle θ of the injection unit 1 is to drive the nozzle touch mechanism 11 and retract the extruder base 10 to separate the injection unit 1 itself from the stationary platen 9. . However, in order to largely retract the injection unit 1, it is necessary to increase the length of the main body of the injection molding machine, and it is not rational to extend the entire length of the main body of the injection molding machine to earn the retracted amount of the injection unit 1. . Also,
Another method is to move the injection unit 1 laterally in parallel on the extruder base 10 to disengage the tip of the injection cylinder 7 laterally from the back surface of the stationary platen 9. Then, most of the injection unit 1 is removed. Will overhang to the side of the extruder base 10, which will be a problem in terms of balance and the like. Of course, it is not technically impossible to provide a special guide means between the injection unit 1 and the extruder base 10 to perform such parallel movement, but the structure becomes complicated and the strength is maintained. The problem remains.

Therefore, in this embodiment, the pivot pin 15 is removed from the hole 17 to remove the bolt 14 from the female screw of the extruder base 10, and as shown in FIG. As a result, by rotating the injection unit 1 on the extruder base 10, the rotation angle θ required to separate the tip of the injection cylinder 7 from the back surface of the stationary platen 9 is reduced.

According to this structure, the distance from the center of rotation of the injection unit 1 to the tip of the injection cylinder 7 is much longer than the distance from the pivot pin 15 to the tip of the injection cylinder 7. In comparison with the case where the injection unit 1 is swung to separate the tip of the injection cylinder 7 from the back surface of the stationary platen 9, the rotation angle θ can be significantly reduced. If the tip movement of the injection cylinder 7 required to disengage the tip of the injection cylinder 7 from the rear surface of the stationary platen 9 is A, the distance from the pivot pin 15 to the tip of the injection cylinder 7 is B, and the pin 19 ejects. The rotation angle required to separate the tip of the injection cylinder 7 from the back surface of the stationary platen 9 by rotating the injection unit 1 about the distance to the tip of the cylinder 7 as C and the position of the pivot pin 15 as the center of rotation is θ1. , If the rotation angle required to disengage the tip of the injection cylinder 7 from the back surface of the stationary platen 9 by rotating the injection unit 1 around the position of the pin 19 is θ2, then A = B sin θ1, A = C sin θ2 and C> B, the value of θ2 may be smaller than the value of θ1. The value of 2 is the rotation angle of the injection unit 1 required to separate the tip of the injection cylinder 7 from the back surface of the stationary platen 9 in this embodiment.

As a result of the smaller rotation angle θ, the value of “a” in FIG. 6, that is, the value of X sin θ becomes smaller, and the working space required for the attachment and detachment of the injection screw 6 is especially large. It is possible to save a lot in the lateral direction, and it becomes possible to laterally deploy a large number of injection molding machines at the molding work site. Although the value of b in FIG. 6 increases as the value of θ decreases, adding the entire length of the injection screw 6 to the tip of the injection cylinder 7 does not reach the length of the injection molding machine body. Increasing the value of does not penalize the injection molding machine arrangement at all.

Further, as shown in FIG. 2, the pin 19, which is the center of rotation, is arranged so as to be positioned at the center of the arcuate groove 18 with the injection cylinder 7 perpendicular to the stationary platen 9. Therefore, the injection unit 1 can be moved parallel to the width direction of the injection molding machine within a certain range from the neutral position with respect to the extruder base 10. The example of FIG. 2 shows an example in which the arcuate groove 18 is formed not near the central axis of the extruder base 10 but at one corner of the extruder base 10.
Since the lateral width of the rear plate 3 is formed to be shorter than the distance between the pivot pin 15 and the rear plate 3, the arcuate groove 18 is formed on the lower surface of the rear plate 3 by overlapping so that it is located at that position. However, the directionality of the arcuate groove 18 substantially coincides with the width direction of the injection molding machine.

Therefore, when the injection unit 1 is swung to disengage the tip of the injection cylinder 7 from the back surface of the stationary platen 9 to attach and detach the injection screw 6, first, the pin 19 and one end of the arc-shaped groove 18 are When the injection unit 1 is swung, the injection unit 1 is swung after the translation is performed on the extruder base 10 in the direction opposite to the swinging direction of the injection cylinder 7 to a position where In addition, it is possible to prevent the tip end side of the injection unit 1 from overhanging from above the extruder base 10 more than necessary in the swinging direction, and it is effective in maintaining the balance of the injection unit 1. In the example of FIG. 2, since the swinging direction of the injection cylinder 7 is counterclockwise, the position where the pin 19 and the upper end of the arc-shaped groove 18 contact each other when the holding balance of the injection unit 1 is important. The injection unit 1 is moved upward in FIG. 2 and then the injection unit 1 is turned counterclockwise around the pin 19.

The injection unit 1 is moved to the position where the pin 19 and the other end of the arcuate groove 18 come into contact with each other.
If the injection unit 1 is swung after the translation is performed on the extruder base 10 in the direction of the swinging direction of the tip, the translation moves the tip of the injection cylinder 7 laterally from the rear surface of the stationary platen 9. The rotation angle of the injection unit 1 required for detachment can be further reduced, which is more effective in saving the working space. In the example of FIG. 2, since the swinging direction of the injection cylinder 7 is counterclockwise, the position where the pin 19 and the lower end of the arc-shaped groove 18 come into contact with each other when it is important to save space in the working space. The injection unit 1 is moved to the lower side in FIG. 2 and then the injection unit 1 is turned counterclockwise around the pin 19. FIG. 3 shows a state when the turning is completed.

In short, according to such an operation, the injection unit 1 itself moves downward in FIG. 2 and the tip of the injection cylinder 7 is displaced from the central axis of the stationary platen 9 downward in FIG. A part of the movement amount of the tip of the injection cylinder 7 required to separate the tip end of the cylinder 7 from the back surface of the stationary platen 9 is covered by the above-mentioned parallel movement amount, and the injection unit 1 is moved by an amount corresponding to the remaining movement amount. Since it is sufficient to rotate the injection unit 1, the rotation angle θ of the injection unit 1 is reduced as a whole. Of course, the injection cylinder 7
In the case where the tip of the injection cylinder 7 is located near the back surface of the stationary platen 9, the tip of the injection cylinder 7 must be separated to the side of the stationary platen 9, so even if the value of θ is different, Although there is no difference in the substantial tip position of the cylinder 7 itself, in reality, since the injection screw 6 needs to be further pulled out from the tip of the injection cylinder 7 and replaced, the tip position of the injection cylinder 7 remains the same. Even if there is, the tip position of the injection screw 6 when the extraction of the injection cylinder 7 is completed greatly differs depending on the magnitude of the angle θ. The tip of the injection cylinder 7 must be separated to the side of the stationary platen 9 because the tip of the injection cylinder 7 is located on the stationary platen 9.
However, when the tip of the injection cylinder 7 is far away from the back surface of the stationary platen 9 (when the extruder base 10 is retracted), this is not the case. Absent.

[0039]

The injection unit swivel mechanism of the present invention is provided with a fitting means for connecting the injection unit and the extruder base on the rear end side of the injection unit, and the injection unit of the injection unit required for replacing the injection screw or the like is provided. In the case of a large turning operation, the injection unit is made to turn about the fitting means as a rotation center. Therefore, regardless of the case, the conventional injection unit turning in which the injection unit is turned about the pivot pin at the center of the tip of the injection unit The distance from the turning center to the tip of the injection cylinder can be made longer than that of the mechanism. As a result, compared with the conventional injection unit swivel mechanism that swivels the injection unit around the pivot pin at the center of the tip of the injection unit, the injection unit required to disengage the tip of the injection cylinder laterally from the back surface of the stationary platen. The rotation angle of can be reduced,
Even when the injection unit is rotated to a position where the injection screw can be replaced, the injection cylinder and the injection screw do not protrude significantly to the side of the injection molding machine, and are necessary for the replacement of the injection screw. The working space required is much smaller than that of the conventional injection unit turning mechanism. As a result, a large number of injection molding machines can be easily installed horizontally at the molding work site.

Further, since the directionality of the arcuate groove forming a part of the fitting means substantially coincides with the lateral width direction of the injection molding machine,
The injection unit can be translated to some extent in the width direction of the injection molding machine on the extruder base. Therefore, if the injection unit is rotated in the direction opposite to the swinging direction of the tip of the injection cylinder on the extruder base, and then the injection unit is swung, the tip side of the injection unit is rotated when the injection unit is swung. It is possible to prevent excessive overhang from the base, which is effective in maintaining the balance of the injection unit. In addition, if the injection unit is rotated in the swing direction of the tip of the injection cylinder on the extruder base and then the injection unit is turned, the translation moves the tip of the injection cylinder from the rear surface of the stationary platen. Since it can cover a part of the amount of movement of the tip of the injection cylinder that is required to separate it sideways, the rotation of the injection unit that is necessary to separate the tip of the injection cylinder laterally from the rear surface of the stationary platen. The corner can be further reduced, and the work space can be saved more effectively.

[Brief description of drawings]

FIG. 1 is a side view showing an outline of a configuration of an injection unit turning mechanism of an embodiment to which the present invention is applied.

FIG. 2 is a plan view showing an outline of a configuration of an injection unit turning mechanism of the same embodiment.

FIG. 3 is a conceptual diagram showing the operation of the injection unit turning mechanism of the same embodiment.

FIG. 4 is a side view showing a schematic configuration of a conventional injection unit turning mechanism.

FIG. 5 is a plan view showing the outline of the configuration of a conventional injection unit turning mechanism.

FIG. 6 is a conceptual diagram showing a problem of a conventional injection unit turning mechanism.

[Explanation of symbols]

 1 Injection Unit 2 Front Plate 3 Rear Plate 4 Screw Pusher Plate 5 Tie Rod 6 Injection Screw 7 Injection Cylinder 8 Nozzle 9 Stationary Platen 10 Extruder Base 11 Nozzle Touch Mechanism 12 Ball Screw 13 Stay 14 Bolt 15 Pivot Pin 16 Through Hole 17 Hole 18 Arc Groove (fitting means) 19 Pin (fitting means) 100 Injection unit 101 Injection cylinder 102 Front plate 103 Rear plate 104 Screw pusher plate 105 Tie rod 106 Injection screw 107 Ball screw 108 Extruder base 109 Pivot pin 110 Nozzle 111 Stationary platen 112 Stay 113 Bolt 114 Nozzle touch mechanism

Claims (2)

[Claims] 1. An injection unit having an injection cylinder fixed thereto is rotatably mounted on an extruder base, and the injection unit is rotated to disengage the tip of the injection cylinder laterally from the back surface of the stationary platen to the tip side of the injection cylinder. In an injection unit swivel mechanism of an injection molding machine configured to perform the attachment / detachment work of the injection screw from, the center of the tip of the injection unit is pivotally supported on the extruder base via a detachable pivot pin, and Fitting means for allowing a swinging motion of the injection unit around the rear end of the injection unit and a minute swinging motion of the injection unit around the pivot pin position between the rear end of the injection unit and the extruder base. The injection unit turning mechanism of the injection molding machine, which is characterized by being connected by. 2. The fitting means is composed of an arcuate groove formed on one of the lower surface of the rear end of the injection unit or the upper surface of the extruder base and the projection formed on the other with the pivot pin position as the center of curvature. The injection unit swivel mechanism of the injection molding machine according to claim 1, wherein: