JPH072354B2 - Gate cut 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 many cases, a plastic molded product molded by an injection molding machine must be taken out with the runner or sprue still attached, and after molding, the gate must be cut to separate the product part from the runner. . Conventionally, such gate cutting was done manually, but recently, for the purpose of labor saving, the use of a gate cutting robot that automatically cuts off the product part from the molded product with runner taken out from the molding machine has become popular. is there.

In the latest example of a gate cut robot, a chuck means for gripping a molded product can be operated in four axis directions by providing a moving means in orthogonal three axis directions and a rotating means composed of a two-phase or five-phase stepping motor. The ones that have been constructed are in circulation. That is, in this type of gate cutting device, after the chuck member receives the molded product taken out from the molding machine by the take-out machine, it moves in three axial directions to the cutting position of the gate cutter provided at the fixed position. Insert one gate of the molded product in a positioning state, rotate the molded product every time the gate cutter cuts the gate, and normally, the gates of the molded product in which a plurality of products are taken in a symmetrical arrangement are continuous. It is designed to cut.

[0004]

However, the following problems are recognized in the above-mentioned existing gate cutting device.

The first problem is that the introduction cost is high. This complicates the operation control mechanism for operating the chuck member for grasping the molded product in the four-axis directions, and in particular, the stepping motor is mounted as the rotational positioning means, which inevitably makes the apparatus expensive. This is because.

The second problem is that it is generally difficult to operate. At the molding site for plastic products, there are many cases where high-mix low-volume production is performed in which the molds of the molding machine are frequently replaced.
Each time the type of molded product changes, the terminal device must be operated to input the necessary gate cut conditions into the control unit, which makes this teaching operation difficult and troublesome for operators on site.

The present invention proposes a new type of gate cutting device which pays attention to the above problems at present and can be provided at a low cost with a simple structure, and which does not require troublesome teaching. .

[0008]

In a gate cutting device according to the present invention, a chuck member movable in orthogonal biaxial or triaxial directions, a cutter support plate made of a magnetic material which is upright in the moving direction of the chuck member, This support plate is provided with a cutter that is detachably attached via a magnet.

[0009]

In this gate cutting device, since the cutter has a mounting structure in which the cutter is detachably attracted to the cutter supporting plate via the magnet, the arrangement of the cutter on the supporting plate can be easily changed. Therefore, if a plurality of cutters are placed in advance on the support plate that is upright in the moving direction of the chuck member according to the gate layout of the molded product with a runner to be gate-cut in advance, the chuck member will support the molded product on the front surface of the support plate. When it is carried in to the fixed position, the respective gates of the molded product are simultaneously set at the cutting positions of the cutter, and in that state, a plurality of product parts of the molded product can be gate-cut simultaneously. That is, according to the present apparatus, it is not necessary to rotate the molded product to sequentially position the gate at the cutting position of the cutter, and therefore, the chuck member does not need a rotation mechanism, and it is sufficient if it can move in at least two orthogonal axes. No need for troublesome teaching.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a gate cutting device according to the present invention.

In this gate cutting device, a chuck member 2 which is movable in two orthogonal biaxial directions is provided on a frame 1. That is, a pair of left and right support brackets 3 and 3 are erected on one side of the pedestal 1, and rods 4 and 4 erected between the support brackets 3 and 3 are reciprocally moved in the X-axis direction. 5, a Y-axis air cylinder 6 is mounted on the X-axis air cylinder 5 in the Y-axis direction orthogonal to the X-axis, and a rod 7 reciprocated in the Y-axis direction by the Y-axis air cylinder 6. A chuck member (air chuck) 2 is attached to the tip of 7. This chuck member 2 is usually
The sprue portion of the molded product with a runner 20 to be gate-cut is gripped and a predetermined carrying operation is performed.

On the other hand, on the opposite side of the gantry 1, a positioning bracket 8 is provided on the right side and a cutter support plate 12 is provided on the left side.
Are provided upright in the uniaxial movement direction (Y axis) of the chuck member 2.

On the front surface of the positioning bracket 8,
A U-shaped positioning guide 9 having V grooves on both sides is attached in a horizontal posture. The mounting height of the positioning guide 9 can be freely adjusted by sliding the holder 10 along a vertical groove 11 provided in the positioning bracket 8 and tightening it at a desired height position. . The attachment position of the positioning guide 9 with respect to the positioning bracket 8 can be replaced with a magnet attraction method like the gate cutter described below. The positioning guide 9 may be replaced according to the type of the runner-formed product 20 that is gate-cut by the present device.

The cutter support plate 12 is formed of a magnetic material such as an iron plate, and has a pair of left and right bite blades 1 on its front surface.
A cutter (air nipper) 13 having 4 is attached. The cutter 13 has a magnet 15 on its back side.
The magnet 15 is attracted to the front surface of the cutter support plate 12 and is detachably attached to the support plate 12. This cutter 13 is prepared in the number of units corresponding to the number of gate-cut molded products 20 with a runner.
It is mounted on the cutter support plate 12 in a positional relationship corresponding to a gate layout of zero. Coordinates 16 for facilitating the positioning of the cutter 13 are attached to the attachment surface of the front surface of the cutter support plate 12.

Next, the operation of this apparatus will be described. In this device, when a take-out machine (not shown) installed on the right side of the gantry 1 carries in the runner-formed product 20 taken out from the molding machine to the position indicated by the chain double-dashed line in FIG. The chuck member 2 waiting on the origin side where the cylinder 5 is displaced to the right side grips the sprue portion of the molded product with runner 20 and receives it.

Thereafter, the Y-axis cylinder 6 is first extended to advance the chuck member 2, and as shown in FIG. 2, the runner portion of the molded product with runner 20 is positioned on both sides V of the positioning guide 9 arranged in front of the runner portion. Abut the groove. At this time,
The grip of the chuck member 2 holding the sprue portion of the molded product with runner 20 is momentarily released free, and the picking-up operation of the molded product with runner 20 is performed. That is, by this, the inclination of the molded product 20 that occurs when the molded product 20 is delivered to the unloader is corrected, and the posture of the molded product 20 with the runner held by the chuck member 2 is corrected.

After the gripping posture of the molded product 20 is corrected in this way, the chuck member 2 is once returned to the original position and then moved in parallel to the left side, and conveyed to the gate cut standby position shown in FIG. To do. From this state, the Y-axis air cylinder 6 is extended to advance the chuck member 2 holding the molded product 20 to a fixed position near the front surface of the cutter support plate 12. FIG. 3 shows the operation at this time, and the respective gates of the molded product with runner 20 carried in by the chuck member 2 are simultaneously set at the cutting position of the cutter 13. Therefore,
If the cutters 13 are simultaneously cut in this state, a plurality of (four in the illustrated example) product portions branched from the molded product 20 are simultaneously gate-cut. In addition, the occlusal blade 14 of each cutter 13 is finely moved upward for those arranged above the runner and downward for those arranged below the runner during the cutting operation to attach the product respectively. The operation is controlled so that the gate is cut at the part.

Next, after the product portion is cut off from the molded product 20, the chuck member 2 operates in the opposite manner to the above and is returned to the origin side, and when the grip is opened in the meantime, the molding member still held by the chuck member 2 is formed. The scrap of the product 20 is released and returned to the original standby position in a hands-free state.

In the above-described gate cutting device, when the chuck member 2 carries the molded product 20 into a predetermined position on the front surface of the cutter support plate 12, the gates of the molded product 20 are simultaneously set to the cutting position of the cutter 13, and the state is maintained. Thus, a plurality of product parts of the molded product 20 can be gate-cut simultaneously.
That is, according to the present device, the molded article 20 is rotated to rotate the cutter 1.
It is not necessary to sequentially position the gates at the cutting position of 3,
Therefore, the chuck member 2 does not need a rotating mechanism, and it is sufficient if the chuck member 2 can move in at least two orthogonal biaxial directions. Therefore, the operating mechanism can be simplified, and the entire device can be provided at a low cost that can be easily installed in a small factory or the like.

Further, since the cutter 13 has a mounting structure which is detachably attached to the cutter support plate 12 via the magnet 15, when the type of the molded product 20 to be gate-cut is changed, the support plate is used. It is possible to easily and quickly rearrange the plurality of cutters 13 on the switch 12 according to the gate layout. Therefore, no troublesome teaching is required in the existing device, and the setup change time is shortened.

The types of the chuck member 2 and the cutter 13, the moving means of the chuck member 2 and the like are not limited to those exemplified in the embodiments. Further, in the present apparatus, it is functionally sufficient if the chuck member 2 can be moved in two orthogonal axes, but if necessary, a moving mechanism in the height direction (Z axis) can be added to operate in three orthogonal axes. It is also possible to do so.

[0022]

As described above, in the gate cutting device of the present invention, the magnet attraction method is adopted for attaching the cutter to the cutter support plate, so that the arrangement of the cutter on the support plate can be easily changed. Therefore, the moving mechanism of the chuck member for gripping the molded product is simplified, and the cost of the entire apparatus can be greatly reduced.
In addition, even if the type of molded product changes, you can easily and quickly respond by changing the placement of the cutter on the support plate,
Troublesome teaching in the existing equipment is not necessary at all, and the improvement effect can be achieved in shortening the setup change time.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a gate cutting device showing an embodiment.

FIG. 2 is a partially enlarged view showing the operation of the apparatus shown in FIG.

FIG. 3 is an enlarged view of a main part showing the operation of the apparatus of FIG.

[Explanation of symbols]

 1 Stand 2 Chuck Member (Air Chuck) 3 Support Bracket 4 Rod 5 X Axis Air Cylinder 6 Y Axis Air Cylinder 7 Rod 8 Positioning Bracket 9 Positioning Guide 10 Holding Tool 11 Vertical Groove 12 Cutter Support Plate 13 Gate Cutter (Air Nipper) 14 Bite Blade 15 Magnet 16 Coordinates 20 Molded product with runner

Claims (1)

[Claims] 1. A chuck member movable in orthogonal two-axis or three-axis directions, a cutter support plate made of a magnetic material which stands upright in the moving direction of the chuck member, and a magnet which is detachably attracted to this support plate via a magnet. A gate cutting device, which is provided with a cutter.