JP2007000980A - Wire type cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wire type cutter used for cutting a continuously fed plastic material to a fixed size, preventing shape collapse in section and rough surface of a cut surface by feeding the wire under tension in the direction of tension in addition to the action of pressing the tensed wire to a material to be cut. <P>SOLUTION: A cutter frame 4 is constructed on two struts 3a, 3b. The wire 10 is wrapped around in a loop shape from a first pulley 6 provided on the upside of one strut 3a through a third pulley 8 provided on an extension part 4a connected to the lower side of one strut side in a cutter holder 4, a second pulley 7 provided on the lower part of the other side strut 3b and a fourth pulley 9 provided on the other strut side in the cutter holder 4 to return to the first pulley 6. The cutter frame 4 is forcibly moved vertically by a cylinder 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a wire-type cutting machine that can be suitably used for cutting plastic materials such as clay, a raw material for ceramics, a raw material for food such as bread and noodle dough, and a raw material for plastic products.

  In a cutting machine that cuts a plastic material, as described in Patent Document 1, a wire is tensioned to a cutter holder, and a cutter blade configured by the tensioned wire is widely used. For example, as described in Patent Document 2 In addition, the cutter blade is fixedly arranged on the moving path of the object to be cut, and the object to be cut is cut in the moving direction of the object to be cut. Two types of cutting methods are known that move in a crossing direction and cut into a predetermined length.

  The cutter blade uses an extremely fine and strong wire like a piano wire, and both ends of the wire are firmly fixed so that they do not loosen in any cutting method. It is possible to reuse the holder by replacing it.

JP 2002-234027 A JP 2001-315187 A JP 2000-117732 A JP-A-9-136320

In conventional wire-type cutting machines, in any cutting method, the wire is in a fixed state pulled on both sides, and there is a relative difference in which of the wire and the workpiece to be moved, but only the pressing action The cut surface was crushed and deformed, and the cut surface was rough.
When the accuracy of the cut surface is required, for example, in a product having a honeycomb-shaped cut surface, the shape loss is fatal.
Also, since the same portion of the wire repeatedly contacts the object to be cut, the contacted portion is severely worn and must be frequently replaced.
Furthermore, if the chips adhering to the wire harden in a scab shape, the cut surface may be damaged by the solid scab-like chips.
In addition, as a wire-type cutting machine, there exists a type which runs a wire as described in patent document 4, However, In such a type, a drive means is separately required.

  The present invention is a wire-type cutting machine that has succeeded in effectively eliminating the drawbacks in view of the above-mentioned drawbacks that have occurred in the conventional wire-type cutting machines, and the configuration thereof is composed of two installed uprights. The cutter frame can be forcibly moved up and down between the struts, and first and second pulleys are provided on the upper part of one of the two struts and the lower part of the other strut, and the cutter Third and fourth pulleys that move up and down together with the cutter frame are provided at a lower position on one strut side of the frame and an upper position on the other strut side, respectively, and the first pulley provided on the upper side of the one strut A third pulley provided at a lower position on one post side in the cutter holder, a second pulley provided at a lower part of the other post, and a fourth pulley provided at an upper position on the other post side in the cutter holder. of Through and over Li, it lies in the multiplied loop wires in order to return to the first pulley provided to the strut top of the one.

  And, the cutter frame is provided with an extension portion continuously below one of the support columns, and a third pulley is attached to the connection portion, or a wire feed path that moves along the support column contacts the wire, A cleaner that removes chips adhering to the wire during the wire feeding operation is installed, or the current state between different pulleys or between the pulley and the cutter wire is monitored. It is possible to provide a disconnection detecting means for warning.

When the first pulley and the third pulley are moved downward by the lowering of the cutter holder, the looped wire is pulled downward while the portion wound around the third pulley is pulled down. The part that is wound around the pulley is loosened downward, so that the part is deformed while the tension is kept constant, and the part that spans between the third and second pulleys (the part that functions as the cutter blade) The portion wound around the third pulley is moved downward with the portion wound around the second pulley as a fulcrum, and is sent out from the third pulley side to the second pulley side.
As a result, the cutter wire is sequentially sent out each time a cutting operation is performed, and the portion used as the cutter blade is rotated.
Therefore, the object to be cut is cut while being pulled (pressed) like a saw, and is less likely to lose its shape than a simple push cut, and the cut surface is smooth.

A wire cutting machine according to the present invention will be described with reference to the drawings.
FIGS. 1 and 2 show a wire-type cutting machine that is placed on the extension of the extrusion port of the kneading extruder and cuts the plastic material continuously extruded from the kneading extruder. Is provided with a roller conveyor 2, and a portal frame 3 is attached so as to straddle the roller conveyor 2.
The portal frame 3 is configured by connecting the upper ends of a pair of left and right support columns 3a and 3b with a horizontal beam 3c, and a cutter frame 4 is assembled between the support columns 3a and 3b so as to be movable up and down.

The cutter frame 4 has a lateral L-shape in which an extension 4a is continuously provided on the lower side of one column 3a. The cutter frame 4 is forcibly moved up and down by a cylinder 5.
A first pulley 6 is provided on the upper side of one of the two columns 3a and 3b, and a second pulley 7 is provided on the lower side of the other column 3b. A third pulley 8 is provided below the extension portion 4a on the column 3a side, and a fourth pulley 9 is provided on the other column 3b side. 7yh8
Since the third pulley 8 is provided below the extension portion 4a, and the fourth pulley is provided at a portion that is not the extension portion of the cutter holder 4, the position of the third pulley 8 and the fourth pulley 9 are provided. These positions are attached to the same cutter frame 4 but are in a vertical relationship with each other.

The first, second, third, and fourth pulleys 6, 7, 8, and 9 include the first pulley 6, the third pulley 8, the second pulley 7, and the fourth pulley 9. The stainless steel wire 10 is looped in the order of returning to the first pulley 6 through the above.
For the attachment of the second pulley 7, an insulating structure is adopted for the portal frame 3.
Reference numeral 11 shown in FIG. 2 is a movable stopper for detecting the tip position of the workpiece 12 that is a plastic material that has been conveyed on the roller conveyor 2 and temporarily stopping the conveyance of the workpiece. Used when cutting a fixed size.

  When the cutter frame 4 is moved up and down by the operation of the cylinder 5, the third pulley 8 and the fourth pulley 9 move up and down together with the cutter frame 4, but the second pulley 7 and the third pulley 8 are different. Since the wire 10 looped around the first, second, third and fourth pulleys 6, 7, 8 and 9 is kept at a fixed position, it does not move. In this state, the first and second pulleys 6 and 7 are deformed according to the movement.

Next, the cutting operation will be described.
When the cutter frame 4 is lowered by the operation of the cylinder 5 with respect to the workpiece 12 continuously sent out on the roller conveyor 2, the wire 10 has a third as shown in FIGS. Pulling force acts downward by the pulley 8, while the fourth pulley 9 follows the movement of the third pulley 8, so that the wire 10 passes through the fourth pulley 9 from the second pulley 7. It is dragged in the direction of one pulley 6 and deforms while moving counterclockwise in the drawing.

Accordingly, the portion of the looped wire 10 that is tensioned between the second pulley 7 and the third pulley 8 (the portion that functions as a cutter blade) is connected to the second pulley 8 side from the third pulley 8 side. While moving to the side 7, the portion wound around the second pulley 7 is moved toward the fulcrum so that the portion wound around the third pulley 8 is lowered and pressed against the workpiece 12.
In other words, if this action is compared to a kitchen knife, it corresponds to a case where the blade is pressed while sliding, so that the cut end does not lose its shape and the cut surface becomes smooth.
Moreover, since the contact part with the to-be-cut object 12 also moves when the wire 10 moves to a tension | tensile_strength, rotation of the part which functions as a cutter blade is also performed.

When the cutter frame 4 is pulled up, the wire 10 is pulled upward by the fourth pulley 9, and the third pulley 8 rises following the movement of the fourth pulley 9 at that time. In the same manner as when the cutter frame 4 is moved down from the pulley 8 through the second pulley 7 toward the fourth pulley 9, it is deformed while moving counterclockwise in the drawing.
That is, the wire 10 is circulated counterclockwise each time the cutter frame 4 moves up and down.

  The cutter frame of the embodiment is operated so as to descend directly like a guillotine. However, the cutter frame can be moved horizontally, or can be pulled in a fixed position to cut a workpiece to be passed. In addition, it can be employed only for the purpose of rotation.

  In addition to the cylinder, the cutter frame can be moved up and down by using a rack and pinion mechanism or a screw feed mechanism, or by hanging the suspended cutter frame by its own weight.

The wire-type cutting machine shown in the embodiment is made of a sponge that contacts the wire 10 on the delivery path of the wire 10 that moves along the column 3a, and removes chips attached to the wire by the delivery operation of the wire 10. A cleaner 13 is attached so that when the wire 10 passes, chips attached to the wire 10 are wiped off.
The cleaner 13 can be provided at a plurality of locations, or a brush can be employed in addition to the sponge.

Further, in this wire type cutting machine, the second pulley 7 is insulated from the portal frame 3 as described above, but the wire 10 is interposed between the second pulley 7 and the third pulley 8. Since it is tensioned, the second pulley 7 and the third pulley 8 are energized by the wire 10.
Therefore, in this embodiment, a disconnection detecting means for monitoring the energization state between the second pulley 7 and the third pulley 8 and warning that there is a possibility of disconnection when the energization interruption is detected is installed. When the disconnection is detected, the cutting operation is automatically stopped.
Note that the disconnection detecting means can be similarly installed between the pulley and the wire.

The wire type cutting machine of the present invention not only pushes the wire but also feeds it by moving the cutter frame, so that rotation is achieved without providing a wire feed mechanism, and a clean cut surface is obtained. be able to.
A metal other than stainless steel or a synthetic resin can be used for the wire of the wire type cutting machine of the present invention, and the object to be cut is not limited to a plastic material, and a tension pulley can be added.

It is a front view of the wire type cutting machine concerning the present invention. It is a side view of the wire type cutting machine concerning the present invention. It is explanatory drawing of cutting | disconnection operation | movement. It is explanatory drawing of cutting | disconnection operation | movement.

Explanation of symbols

  1 ·· Base, 2 ·· Roller conveyor, 3 ·· Gate frame, 3a, 3b ·· Post, 3c ·· Horizontal beam, 4 ·· Cutter frame, 5 ·· Cylinder, 6 ·· First pulley 7... Second pulley 8.. Third pulley 9.. Fourth pulley 10.. Wire 11. Stopper 12.

Claims (4)

A cutter frame can be forcibly moved up and down between two upright posts, and the first and second are attached to the upper part of one of the two supports and the lower part of the other support. And a third pulley and a fourth pulley that move up and down together with the cutter frame at the lower position on one pillar side and the upper position on the other pillar side of the cutter frame, respectively, From the first pulley provided at the top, a third pulley provided at a lower position on one column side in the cutter frame, a second pulley provided at the bottom of the column on the other side, and the other pulley in the cutter frame A wire-type cutting machine in which a wire is looped in the order of returning to the first pulley provided on the upper side of the one column through a fourth pulley provided at an upper position on the column side. The wire-type cutting machine according to claim 1, wherein the cutter frame has an extension portion continuously provided below one of the support columns, and a third pulley is attached to the extension portion. The wire type cutting machine according to claim 1 or 2, wherein a cleaner that attaches to the wire delivery path of the wire that moves along the support and removes chips attached to the wire by the wire delivery operation is attached. The disconnection detection means which monitors the energization state between mutually different pulleys or between a pulley and a wire, and warns that there is a possibility of disconnection when detecting the interruption of energization is provided. Wire cutting machine.

Images