JP2554503Y2 - Gate cutting device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gate cutting device used for a gate cutting operation of a plastic molded product.

[0002]

2. Description of the Related Art In general, a plastic molded product molded by an injection molding machine is taken out with a runner or a sprue adhered thereto, and after molding, a gate is cut and a product part is usually separated from the runner. However, recently, for the purpose of labor saving, various gate cutting devices for automatically cutting off a product portion from a molded product with a runner taken out of a molding machine have been proposed and are becoming popular.

In general, a gate cut device includes a chuck member for gripping a sprue portion of a work (molded product with a runner) taken out of a molding machine and moving and rotating the work, and a work gripped by the chuck member. And a cutter for cutting a gate portion of a work carried into a predetermined cutting position by a chuck member.

In this type of gate cutting apparatus, when a work taken out of a molding machine by a take-out machine is carried into a delivery position on a gantry, a chuck member grabs a sprue portion of the work and receives the work. A re-gripping operation is performed in which the sprue portion of the work is centered and chucked by contacting the positioning guide, and when the work is carried into the cutting position on the front of the cutter, the gate portion of the work gripped by the chuck member is preliminarily gate-laid. Are positioned accurately at the cutting positions of the respective cutter units arranged in accordance with the above.

[0005]

By the way, there are various types of workpieces formed by a molding machine, and some of them have a considerably long runner portion. However, when the gate cutting device attempts to cut a workpiece having such a long runner, the following problem may occur.

FIG. 6 shows a state where the sprue portion S of the work W is chucked by the chuck member 6 of the gate cutting device. At this time, if the runner portion R of the work W is long as shown in the figure, the runner portion R moves forward and backward, left and right (arrows a and b) with the movement and rotation of the work W by the chuck member 6. ) And easily oscillate. If the runner portion R oscillates, the relative position of the gate portion g with respect to the cutter unit will be deviated, causing a problem that adversely affects the cutting accuracy of the gate cut.

The present invention is to provide an improved gate cutting device capable of solving the problem of poor gate cutting accuracy caused by the runout of the runner.

[0008]

In the gate cutting device according to the present invention, as a means for achieving the above object, a chuck member which grips a sprue portion of a work and moves and rotates around the chuck member is provided. And a runner holder for supporting the runner portion of the work gripped by the step.

[0009]

If the runner holder is added around the chuck member, the runner part of the work gripped by the chuck member is supported by the runner holder, and the runner part swings due to the movement and rotation of the work. Will be restricted.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.
First, the outline of the gate cut device to which the present invention is applied will be briefly described with reference to an example shown in FIG.

This gate cutting device is mounted on a gantry 1
A guide support plate 3 provided with a positioning guide 2 on one side and a cutter support plate 5 provided with an air nipper 4 forming a gate cutter are arranged, and on the opposite side, parallel to the orthogonal X, Y2 and Y axes on a gate cutting device. Move around one axis (θ axis)
A rotating chuck member (chuck pawl) 6 is arranged. In this apparatus, when a work is carried into a predetermined delivery position by a take-out machine (not shown), the chuck member 6 grasps the sprue portion and works (not shown).
First, the work is brought into contact with the positioning guide 2 provided on the guide support plate 3 at the opposing position to correct the gripping posture, and then the work is transferred to the cutting position on the front surface of the cutter support plate 5, A series of cycle operations combining movement and rotation of the product portion by gate cutting by the air nipper 4 while rotating the work as necessary are performed, and the gate cutting work of the work can be automatically and continuously performed.

In addition, in FIG. 5, reference numeral 8 denotes a rodless X-axis air cylinder which is installed on the gantry 1 and moves the chuck member 6 straight in the X-axis direction. A Y-axis air cylinder 10 that moves the member 6 in the Y-axis direction is a step high rotor that is mounted on the Y-axis air cylinder 9 and rotates the chuck member 6 in the θ-axis direction. The chuck member 6 is mounted on a pair of operating claws of the supported chuck actuator 7. Reference numeral 11 denotes a work detection sensor which is provided at a work loading position by a flexible holder 12.

Next, with reference to FIGS. 1 to 4, the chuck member 6 of the gate cutting device and the runner holder 24 disposed around the chuck member 6 will be described in detail.

The chuck member 6 includes a pair of upper and lower claws, and is mounted on the operating claws 7a of the chuck actuator 7, respectively. Around the chuck member 6,
Runner holder 2 via an inner ring member and an outer ring member described later
A pair of upper and lower support brackets 13 for supporting the support bracket 4 are attached. The support bracket 13 is attached by clamping the base end thereof above and below the actuator 7 via a holding plate 14.

An outer ring member 16 is fixed to the outer end of each support bracket 13 so as to concentrically surround the outer end of the chuck member 6.
An outer ring member 18 is attached to the outer periphery of 6. The outer ring member 18 is attached to the inner ring member 16 so as to be rotatable (arrow B in FIG. 2) and is immovably mounted in the front-rear direction by attaching a separate pressing ring 19 to the back surface. A set bolt 20 for positioning the rotation stop position is inserted and attached.

A pair of holder mounting plates 21 are mounted on the outer ring member 18 at opposing positions.
The runner holder 24 according to the present invention is attached to the front surface of the outer case 1. Here, the holder mounting plate 21 is screwed 23 so as to be able to advance and retreat in the front-rear direction with respect to the outer ring member 18 via the elongated hole 22 (arrow C in FIG. 3). Further, the runner holder 24 made of an L-shaped member has a V-shaped notch 24a for receiving the runner portion R of the work W and supporting the runner portion R at a tip end protruding from the holder mounting plate 21. An elongated hole 25 is provided at a base end portion in contact with the front surface of the holder mounting plate 2 through the elongated hole 25.
1 is screwed 26 so that it can be opened and closed in the radial direction (arrow A in FIG. 1).

Thus, as long as the runner holder 24 is provided around the chuck member 6, when the sprue portion S of the work W is gripped by the chuck member 6, as indicated by a two-dot chain line in each drawing, The runner R of the work W enters the bottom of the V-shaped notch 24a of the runner holder 24 provided around the chuck member 6, and the runner R is supported in the front-rear and left-right directions by both side edges of the V-shaped notch 24a. It will be something that can be done.

Therefore, even when the runner R of the work W is long and lacks rigidity, the runner R moves forward and backward as indicated by arrows a and b in FIG. And the relative positional relationship between the gate unit and each cutter unit when the workpiece W is carried into the gate cutting position is not disturbed. Will be secured.

Further, as shown in the illustrated embodiment, a pair of runner holders 24 disposed around the chuck member 6 are opened and closed.
In the case of adopting a mounting structure that can be moved forward / backward and back and rotate (arrows A, B, and C), various conditions such as a type and a size of the work W, specifically, a runner length, a sprue length, and a work receiving posture, etc. The convenience of being able to change and adjust the mounting state of the runner holder 24 in response to the change is obtained.

However, it goes without saying that the mounting structure of the runner holder 24 provided around the chuck member 6 is not limited to that shown in the embodiment. Further, the form of the runner holder 24 that supports the runner portion R of the work W can be changed as appropriate.

[0021]

As described above, in the gate cutting device of the present invention, the runner holder is provided around the chuck member to support the runner portion of the work gripped by the chuck member, so that the length of the runner is long. In this case, the runout of the runner portion can be prevented, and the problem that adversely affects the cutting accuracy of the gate cut due to the runout of the runner portion can be properly solved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a chuck portion of a gate cutting device according to an embodiment.

FIG. 2 is a front view of FIG.

FIG. 3 is a plan view of FIG. 1;

FIG. 4 is a perspective view showing an outline of the gate cutting device shown in FIGS.

FIG. 5 is a perspective view showing an outline of the entire gate cutting device to which the present invention is applied.

FIG. 6 is a cross-sectional view showing a state in which a long runner work is chucked by a chuck member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mounting stand 2 Positioning guide 3 Guide support plate 4 Air nipper 5 Cutter support plate 6 Chuck member 7 Actuator for chuck 7a Working claw 8 X-axis air cylinder 9 Y-axis air cylinder 10 Step high rotor 12 Flexible holder 13 Support bracket 14 Pressing plate 15 Clamp Reference Signs List 16 inner ring member 17 fixing member 18 outer ring member 19 holding ring 20 set bolt 21 holder mounting plate 22 long hole 23 screw 24 runner holder 24a V-shaped notch 25 long hole 26 screw W Work (molded product) S sprue R runner

Claims (1)

(57) [Scope of request for utility model registration] 1. A gate cutting device, comprising: a runner holder for supporting a runner portion of a work gripped by a chuck member provided around a chuck member that moves and rotates while gripping a sprue portion of the work. .