JPH036412Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a turning mechanism of an injection device in an injection molding machine.

[Technical background of the invention and its problems]

The basic structure of the rotation mechanism in a conventional injection molding machine is, as schematically shown in FIGS. 8 and 9, a bracket 2 is provided on a fixed die plate 1, and a bracket is also provided on the side of the injection device 3 opposite to this. 4 is provided, the base of the moving cylinder 5 is rotatably supported on the bracket 2 of the fixed die plate 1 by a pin 6, and the tip of the rod 7 is connected to the bracket 4 of the injection device 3 by inserting and removing the pin 8. It is said to be removable.

The injection device 3 has a guide groove 9 formed on the sliding table side.
The range of movement is regulated by the fitting of the pivot pin 10 on the injection device 3 side.

Therefore, when rotating the injection device 3,
The movable cylinder 5 is operated to move the injection device 3 backward over the stroke A to the retract limit, and at the retract limit position, the rod 7 of the movable cylinder 5 is removed from the bracket 4, and the turning pin 10 is located at the right end of the guide groove 9 in the figure. Therefore, by pulling the injection device 3 toward you, it can be rotated around the rotation pin 10 as shown in FIG. 9.

However, in the case of a conventional small-sized injection molding machine, since the injection device 3 is relatively lightweight, the operator can push and pull it by hand to rotate it, and therefore the mechanism shown in the first diagram is However, in order to meet the diverse molding conditions of today, hopper dryers, inspection steps, etc. are often directly attached to the injection equipment of small molding machines.
As the weight of injection devices has increased, it has become difficult for workers to turn them by hand.

Therefore, a turning mechanism (Japanese Utility Model Application Publication No. 16063/1983) has been proposed in which the above-mentioned problems are solved by utilizing a moving cylinder for turning the injection device. This product uses a long stroke type in which the guide groove formed on the sliding table side is bent into a dogleg shape, and the moving cylinder allows for a swing stroke, and the injection device swings at the backward limit position. When the rod is to be rotated, hydraulic pressure is further applied to the moving cylinder and the rod is actuated by the stroke required for the rotation, thereby causing the rod to rotate.

However, according to the above configuration, the first problem is that when the injection device is pulled back by the movable cylinder when returning from the swinging state, the injection device does not return and moves toward the movable cylinder while remaining in the swinging position. The second problem is that the injection device moves forward,
In addition to the stroke required to move the injection device backward, a moving cylinder is required that has a stroke required to rotate the injection device, and therefore a cylinder whose total length is longer than that of conventional moving cylinders is required. When using a movable cylinder with a long stroke like this, if the distance between the fixed die plate and the injection device is not large enough to mount the above cylinder due to other conditions, the mounting position of the movable cylinder mounting bracket may change. must be installed inside a fixed die plate or injection bracket, which poses major structural and assembly problems.A third problem is that the retraction limit of the injection device and the subsequent pivoting movement are moved. Because it only depends on the stroke amount of the cylinder, electrical or hydraulic problems may cause a sudden turning operation while reversing, which may damage the guide plate or, in some cases, cause damage to the operator. may pose a danger to

[Purpose of invention]

The present invention focuses on the above-mentioned drawbacks of the prior art, and was developed with the aim of improving them.The present invention enables the injection device to reliably rotate without extending the stroke of the movable cylinder. An object of the present invention is to provide a turning mechanism for an injection device in an injection molding machine, which can eliminate complicated configurations and difficulties in assembly, and improve work safety.

[Summary of the idea]

In order to achieve the above object, the turning mechanism according to the present invention has a turning roller that becomes the center during turning on one of the lower surface of the injection device and the upper surface of the sliding table that slides thereon, and a turning roller on the other side. In an injection molding machine, the injection molding machine is provided with a guide groove that is fitted into the guide groove and guides the injection device in the moving direction, and a moving cylinder that moves and rotates the injection device, and a fixed die plate that rotates one end of the moving cylinder. a bracket for possible attachment, and an insertion hole for the pin located at a position offset from the center line of the injection device for connecting the tip end member of the rod of the movable cylinder via a pin for moving the injection device. The present invention is characterized by a structure comprising a connecting member having the following structure, and a forward movement preventing means that prevents the injection device from moving forward during the return rotation operation and guarantees the return rotation operation at that position.

[Example of idea]

Hereinafter, the present invention will be explained with reference to the embodiments shown in FIGS. 1 to 7, and parts common to those in FIGS. 8 and 9 are denoted by the same reference numerals.

On the left side and lower side in the figure of the injection device 3,
A connecting member 11 is provided protrudingly provided, and a hole 12 is bored near the tip of this connecting member 11 for connecting the tip member 7A of the rod 7 of the movable cylinder 5 with a pin 8 when the injection device 3 rotates. .

Connecting member 11 to bracket 4 of injection device 3
An attachment member 13 is fixed to the opposite side of the tip member 17A, and a limit switch 14 is attached to the attachment member 13 in contact with the tip member 17A to control its movement.

A turning roller 10, which serves as a center of rotation, is provided at the bottom of the injection device 3 and protrudes downward, and this turning roller 10 is fitted into a guide groove 9 formed on the sliding table side to guide its movement. It's becoming like that.

At the rear of the injection device 3, there is a forward movement prevention means 1 that prevents the injection device 3 from moving forward during the turning return operation.
5 is provided.

In the illustrated embodiment, the forward movement prevention means 15 includes a rotating body 17 rotatably supported via a fixture 16 at a position protruding toward the sliding base from the sliding surface at the rear of the injection device 3; Injection device 3 provided on the moving table side
and a turning guide 18 having a guide surface 18A with which the periphery of the rotating body 17 comes into contact to limit the turning locus when the rotating body 17 turns. Note that the configuration of the forward movement prevention means 15 is not limited to the above-mentioned embodiment, and may be any other configuration as long as it performs the same function.

Next, the operation of the above embodiment will be explained.

FIG. 1 shows a state in which the injection device 3 is retracted to the retraction limit by the movable cylinder 5 during normal molding, and the movable cylinder 5 is advanced by a stroke A.

In this state, the pin 8 is removed and the rod 7 of the moving cylinder 5 is moved back by a distance B as shown in the second figure. This backward movement of the rod 7 causes the tip member 7 to
A contacts the limit switch 14, and the moving cylinder 5 is automatically stopped by a signal from the limit switch 14.

Next, as shown in the third figure, the movable cylinder 5 is drawn toward the user, and when the hole in the tip member 7A matches the hole 12 in the connecting member 11, the pin 8 is inserted to connect the two.

After doing this, the rod 7 of the moving cylinder 5
When the injection device 3 is moved forward again by a distance B, the turning roller 10 of the injection device 3 comes into contact with the right end of the guide groove 9, as shown in FIG. 4, and the injection device 3 turns by a predetermined angle.

In the above, a case has been described in which the rotating roller 10 is provided on the lower surface of the injection device 3 and the guide groove 9 is provided on the sliding table side. When provided on the lower surface, the turning roller 10 comes into contact with the left end of the guide groove 9 and turns when turning, and there is no rule for the forward side of the injection device 3.
Therefore, a problem arises in that the injection device 3 moves forward when returning from the pivoted position to the normal position, which will be described later.

Next, in order to return the rotation position to the normal position, the injection device 3 must be
The turning roller 10 tries to move toward the moving cylinder 5 along the guide groove 9, but as shown in FIGS. 5, 6, and 7, the rotating body 17 at the rear end of the injection device 3 Since it is in contact with the guide surface 18A of the swing guide 18 on the sliding table side, the injection device 3 is guided along the guide surface 18A of the swing guide 18 without moving until the rotating body 17 returns to the machine center position. As a result, a turning return operation is performed and the state shown in the third figure is reached.

Note that, as shown in FIG. 6, the rotating body 17 of the injection device 3 does not come into contact with the rotation guide 18 attached to the sliding table during normal molding operation, so there is no problem.

[Effect of idea]

As explained above, the present invention allows the injection device to rotate and return without extending the stroke of the movable cylinder, so even if the weight of the injection device increases, there is no need to rely on manual operation. Work efficiency can be significantly improved, and since there is no need to increase the length of the moving cylinder, the moving cylinder can be installed without being restricted by the distance between the fixed bracket and the injection device.
It does not become structurally complicated. In addition, during the turning operation, the operator switches the connection position of the rod tip of the moving cylinder, which makes the normal nozzle touch operation and the turning operation clearly different, which has various effects such as being effective in terms of safety measures. There is.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view showing an embodiment of the turning mechanism of the injection device in the injection molding machine according to the present invention, and FIGS. 2 to 4 are schematic plan views showing the same operating state.
5 to 7 are explanatory diagrams showing specific examples of the advance prevention means in FIG. 1, and FIGS. 8 and 9 are operational explanatory diagrams showing a conventional turning mechanism. 1... Fixed die plate, 2, 4... Bracket, 3... Injection device, 5... Moving cylinder, 6,
8... Pin, 7... Rod, 9... Guide groove, 10
...Turning roller, 11...Connecting member, 12...
Hole, 14...Limit switch, 15...Advance prevention means, 17...Rotating body, 18...Swivel guide.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A turning roller that becomes the center when turning is placed on one of the lower surface of the injection device and the upper surface of the sliding table that slides thereon, and this turning roller is fitted on the other side. In an injection molding machine provided with a guide groove for guiding the injection device in a moving direction, the injection molding machine includes a moving cylinder for moving and rotating the injection device, and a movable cylinder for rotatably attaching one end of the moving cylinder to a fixed die plate. a bracket; a connecting member located at a position offset from the center line of the injection device and having an insertion hole for the pin to connect the tip end member of the rod of the moving cylinder via a pin in order to move the injection device; A turning mechanism for an injection device in an injection molding machine, comprising: a forward movement prevention means for preventing the injection device from moving forward during a turning return operation and ensuring a return turning operation at that position. 2. The forward movement prevention means is comprised of a rotating body protruding from the rear end of the injection device and a turning guide provided on the sliding table side.
A turning mechanism of an injection device in the injection molding machine described in 1.