JP4324947B2 - Cutting device - Google Patents

Description

  The present invention relates to a cutting apparatus for cutting a cut-off portion of a workpiece, for example, a rubber molded body after injection molding.

  As shown in the side view including a partial cross-section of FIG. 3, the processed molded body 1 to be cut is a conical cylindrical rubber molded body in which synthetic rubber is injection-molded. It is a drive boot that prevents leakage. It has elasticity, the bellows part can be bent freely with respect to the bending force, and the axial center in a free posture is kept substantially straight.

  Since this rubber molded body 1 uses a nest in the molding die, the lower end is a cap with a bottom (boot cap), and this boot cap, that is, the first cut-off portion 1d is an unnecessary part in use. Is truncated. Moreover, if the runner (2nd cut-off part 1d-1) shown with the dashed-two dotted line of the upper end has come out, this will also be cut off by the unnecessary part.

  Conventionally, a predetermined number of these rubber molded bodies have been once collected in a storage container after being punched, cooled to about room temperature, and then manually cut off at the cut-off portion. That is, the worker holds the rubber molded body in his hand and uses the scissors to remove the first cut-off portion (boot cap) 1d from the thin (about 2 mm) constricted groove 1e (see cutting position A in FIG. 3). It was separated.

  However, according to the conventional manual cutting, since the bellows portion of the rubber molded body is easily bent, it takes time to hold and cut the rubber molded body, and the cut surface cannot be made uniform, and further, the manual operation However, since the first cut-off portion (boot cap) and the second cut-out portion (runner) at both ends of the rubber molded body cannot be cut simultaneously, there are two separate steps, resulting in poor processing efficiency.

The prior art includes a cutting device disclosed in Japanese Utility Model Laid-Open No. 1-110092. Hereinafter, the technique of this publication will be described. (See FIGS. 1 and 4 of this publication)
The jig 1 is inserted into the rubber molded body 100, and the film gate portion of the cylindrical portion including the spool portion 101, the runner portion 102, and the film gate portion 103 is cut with the cutting blade 3 while the jig 1 is rotationally driven. The cylinder part is cut off.

  The length of the first holding portion 11 of the jig is larger than the depth of the cylindrical portion, and when the jig is inserted into the jig, the film gate portion is extended to hold the main body 104 in a state where a tensile stress is applied. A vacuum suction means and a holding device 4 (comprising a chuck 41 and a guide member 42) are provided for covering the jig with a rubber molded body to prevent vibration and noise when the spool portion 101 is cut.

  Another conventional cutting apparatus is a cutting apparatus disclosed in Japanese Patent Application Laid-Open No. 2006-159326. Hereinafter, the technique of this publication will be described. (Refer to FIGS. 1 and 2 of this publication)

  Two or more fixed arms 2 provided with a contact detection sensor 5 that is placed on the fixing device main body 1 and detects the elastic workpiece 4 are moved and placed on the fixing device main body 1. When the detection sensor 5 detects the elastic workpiece 4, it stops and grips the elastic workpiece 4. The fixing device main body 1 is driven to rotate, and the round cutting blade 4 provided in the movable arm 3a with a distance sensor of the cutting machine 3 is advanced and cut.

    Japanese Utility Model Publication No. 1-110092     JP 2006-159326 A

  However, in the configuration of Patent Document 1, in order to prevent the vibration and noise of the spool portion 101 during cutting by covering the rubber molded body 100 on the jig 1 with the vacuum suction means for extending and holding the film gate portion 103. The holding device 4 is required to be complicated in structure, and a series of operations of these elements requires a predetermined time before and after cutting, so that the cutting process takes time. Further, there is a problem that a workpiece that is difficult to stretch and has a shape that cannot be vacuum-sucked is difficult to cut according to the disclosed technical idea.

  Further, in the configuration of Patent Document 2, a contact detection sensor 5 is attached to the fixed arm 2 to hold the elastic workpiece 4, and a distance sensor is attached to the movable arm 3a of the cutting machine 3 to expand and contract the cutting blade 4. The structure to be processed is complicated, and a series of operations of these elements requires a predetermined time before and after cutting, and thus there is a problem that the cutting process takes time.

  As described above, in the configurations of Patent Documents 1 and 2, a complicated structure is required to hold the processed product in a severable manner, and a series of sequence control and operation for that purpose takes time, and the cutting process cannot be performed in a short time. There is. Further, the cutting with the saw-shaped cutting blade of Patent Document 2 has a problem that cutting waste is generated and processing is required thereafter.

  In view of the above-mentioned problems, the present invention holds a workpiece to be processed such as a rubber molded body with a simple structure, and can cut a cut-off portion of the workpiece to be cut in a short time without generating any cutting waste. An object of the present invention is to provide a cutting device in which the thickness becomes uniform.

In order to achieve the above object, the first problem-solving means opens the upper and lower ends so that the workpiece can be held in a severable manner with only the hollow case . a hollow portion of the space formed in accordance with the outer shape, the processed shaped body 該被processed compact when the charged from the top opening to the hollow portion is positioned in the axial direction a first of said object to be processed compact that holds out outside the cutting position of the truncated portion from to match the end face cleavably the lower open end of said lower open end, and a circular cylindrical hollow casing, the hollow on the outer periphery of said hollow casing A support means for supporting the rotation axis of the case in the vertical direction and rotatably guiding the hollow case; a rotation driving means for driving and rotating the molded body together with the hollow case on the outer periphery of the hollow case; and the molded object to be processed Cutter for cutting the first cut-off part of And attaching a IF is a side surface of the cutter knife what constitutes and a cutting means for advancing and retracting in sliding contact with the opening end face of the hollow casing.

According to a second aspect of the present invention, there is provided a configuration in which a second cutting device is provided for cutting the second cut-out portion protruding from the upper opening end of the hollow case in synchronism with the cutting means of the first cut-out portion. It is what.

  The operation of the first problem solving means is as follows. In other words, the hollow case that holds the workpiece to be processed is provided with a hollow portion having a volume that matches the outer shape of the workpiece to be processed, so that the workpiece to be processed is introduced into the hollow portion of the vertically supported hollow case from above. As a result, the workpiece and the hollow case can be automatically set concentrically with a simple structure of only a single hollow case without the need for other holding means.

  Further, the molded body can be held without being slipped due to the adhesion by being pressed against the wall surface of the hollow portion by the centrifugal force that rotates with the rotation of the hollow case and acts on the molded body. In addition, by cutting out the cut-out part from the opening end face of the hollow case and cutting it while sliding the cutter knife with the opening end face as a guide surface, the cutting surface can be cut evenly in a short time. Can do. Further, since the cutter knife is a straight blade, no cutting waste is generated as compared with a round cutting blade (see FIG. 1 of Patent Document 2).

[0023]
【The invention's effect】
As described above, according to the cutting device of the present invention , both the upper and lower ends are opened so that it can be configured with a very simple structure at low cost, and the workpiece can be held in a severable manner with only the hollow case. A hollow portion of a space formed in accordance with the outer shape of the workpiece to be processed is provided, and when the workpiece is inserted into the hollow portion from the upper end opening, the workpiece to be processed is positioned in the axial direction so that the workpiece is molded. Since the cutting position of the first cut-off part of the body matches the end face of the lower opening end so as to be cut out and held from the lower opening end , the cutting process can be performed in a short time, The cut surface can be made uniform. In addition, since it does not produce cutting waste, it exhibits an extremely useful effect in the industry that no post treatment is required.

  As described above, according to the cutting device of the present invention, it can be configured at a low cost with an extremely simple structure, and the molded object can be held immediately so that it can be cut only with a hollow case, so that the cutting process can be performed in a short time. And the cut surface can be made uniform. In addition, there is almost no vibration and noise, and since there is no cutting waste, an extremely useful effect in the industry that post treatment is unnecessary is exhibited.

Hereinafter, the gist of the present invention will be described in detail based on the embodiments shown in the drawings.
As shown in the side view of the main part including a partial cross section of FIG. 1, the processed molded body 1 is a rubber molded body injection-molded with synthetic rubber as shown in FIG.

  As shown in FIG. 3, the rubber molded body 1 is formed of a large-diameter upper end ring portion 1a, a small-diameter lower end ring portion 1b, and a conical cylinder-shaped bellows portion 1c connected therebetween. The connecting portion between the upper end ring portion 1a and the bellows portion 1c has a larger diameter at the upper end ring portion 1a than the bellows portion 1c to form a step 1a-1.

  At the connection portion between the lower end ring portion 1b and the bellows portion 1c, the lower end ring portion 1b has a smaller diameter than the bellows portion 1c to form a step 1c-1. A thin-walled narrow groove 1e is formed in the lower end ring portion 1b. This narrow groove 1e is a cutting position, and the tip is an unnecessary portion in the first cut-out portion 1d.

  The hollow case 2 into which the rubber molded body 1 is placed is cylindrical and is made of a synthetic resin material such as nylon. A space formed in accordance with the outer shape of the rubber molded body 1 is formed as a hollow portion 2a, and both upper and lower ends thereof are opened and penetrated. .

  The inner diameter of the upper and lower ends of the hollow portion 2a is set to be approximately 0.5 mm larger than the outer diameters of the upper end ring portion 1a and the lower end ring portion 1b of the rubber molded body 1 so that it can pass smoothly. The inner diameter of the intermediate portion corresponding to the bellows portion 1c is a conical shape with a margin (play). Thereby, the rubber molded body 1 can be easily put in from the upper opening of the hollow case 2 standing vertically.

  The hollow portion 2a of the hollow case 2 has a first step portion 2a-1 and a first step portion 2a-1 corresponding to the step 1a-1 of the upper ring portion 1a of the rubber molded body 1 and the step 1c-1 of the lower end of the bellows portion 1c. 2 step portions 2b-2. The rubber molded body 1 that has been put into the hollow case 2 standing vertically by hand from the upper opening is positioned in the axial direction.

  When positioned, the lower opening end face of the hollow portion 2a of the hollow case 2 and the constriction groove 1e are aligned with each other, thereby cutting the constriction groove 1e (see the cutting position A in FIG. 3) and exiting outside. One cut-off portion 1d can be cut off. At this time, the axial height of the hollow case 2 is designed so that the upper end surface of the hollow case 2 and the end surface of the upper end ring portion 1a are flush with each other. As a result, the runner 1d-1 protruding from the upper end surface of the hollow case 2 can also be cut simultaneously.

  The hollow case 2 is provided with a guide groove 2a-3 on the outer peripheral surface. The guide groove 2 a-3 engages with a guide roller described later that supports the hollow case 2 and guides the rotation of the hollow case 2. In addition, the hollow case 2 has a tooth profile integrally formed on the outer peripheral surface to form a gear 2a-4. The gear 2a-4 meshes with a pinion gear described later and rotates the hollow case 2.

  The support means 3 for supporting the hollow case 2 includes a bracket 3a fixed on the apparatus base 10 and a plurality (four) of guide rollers 3b (combination of thrust bearings and radial bearings) supported on the bracket 3a. . The guide roller 3b restrains and engages both the axial direction and the radial direction at the four circumferential points of the guide groove 2a-3 of the hollow case 2, thereby stably supporting the rotational axis of the hollow case 2 in the vertical direction. It can be rotated.

  The rotation driving means 4 for rotating the hollow case 2 is formed by fixing a DC motor 4b with a reduction head, on which the pinion gear 4a meshing with the gear 2a-4 of the hollow case 2 is fixed, on the apparatus base 10, and is not shown. Start and stop by the drive circuit. The drive circuit includes a rotation speed variable volume and a push button switch for starting and stopping.

  The cutting means 5 for separating the cut-off portion 1d of the rubber molded body 1 includes a base 5c fixed on the apparatus base 10, an air cylinder 5b fixed on the base 5c, and a cutter knife 5a attached to the air cylinder 5b. Prepare.

  As shown in FIG. 2, the cutter knife 5a (for example, using a commercially available KOKUYO cutter, Olfa cutter, etc.) has a straight blade and does not direct the cutting advance direction of the cutting edge 5a-1 toward the center of rotation, but a cutting portion. From the point of contact with 1d, it is decentered in the reverse rotation direction by a predetermined angle θ, that is, 5 ° to 7 ° with respect to the rotation axis of the hollow case. This angle θ depends on the material, hardness, and rotation speed, so it is set in a posture that makes it easy to actually cut and try to cut. The straight blade of the cutter knife is made to coincide with the forward / backward (reciprocating) direction of the air cylinder.

  Further, the air cylinder 5b is in a position when the cutting edge 5a-1 of the cutter knife 5a is in a standby (retracting) position, with the side surface of the cutting edge 5a-1 being brought into contact with the lower opening end face of the hollow case 2 and sliding the end face as it is. Set to advance and retreat.

  As a result, the cutting edge can be cut into the constriction groove of the rubber molded body so as to be along the rotation direction without hitting the peripheral side surface of the hollow case when moving forward. In addition, since the side of the cutter knife moves forward while making sliding contact with the lower opening end surface of the hollow case, blade blur due to cutting resistance can be suppressed, and the cutting surface matches the cutting end uniformly and cleanly cuts the cutting surface uniformly. Can do.

  The forward / backward (reciprocating) stroke of the air cylinder is selected in advance according to the cutting thickness at which the rubber molded body is turned. The air cylinder is connected to a high-pressure air supply source (not shown) and an electromagnetic valve that controls the reciprocation of the air cylinder, and the electromagnetic valve controls the forward and backward movement of the cutter knife in conjunction with the start and stop of the DC motor. In addition, a pressure control valve is provided in the high-pressure air passage so that the speed of each advancement and retreat of the cutter knife can be changed.

  A first light detection sensor 6 (photocoupler) for detecting the first cut-off portion 1d of the rubber molded body 1 held in the hollow case 2 in order to start and stop the DC motor 4b and the air cylinder 5b, and a rubber molded body And a second photodetection sensor 7 (a photocoupler) that detects the first cut-off portion 1d that is separated from the first halfway and falls.

The first light detection sensor 6 activates a start switch (not shown) based on the output signal, and turns on the start switch to start the DC motor 4b to rotate the hollow case 2 and drive the air cylinder 5b. The cutter knife 5a is advanced.
The second light detection sensor stops the DC motor 4b by the output signal and moves the air cylinder 5b backward.

Next, the operation of the cutting device will be described below.
The operator manually inserts the rubber molded body 1 collected in the storage container into the hollow portion 2a from the upper opening of the hollow case 2 with the first cut-out portion 1d facing downward. The inserted rubber molded body 1 is automatically positioned by receiving the first step 2a-1 and the second step 2a-2 of the hollow case 2. At that time, the first photodetection sensor 6 detects the first cut-off portion 1 d protruding from the lower opening of the hollow case 2.

  When an operator turns on a start switch (not shown), the DC motor 4b and the air cylinder 5b are started simultaneously. When the hollow case 2 rotates together with the rubber molded body 1, the processed molded body 1 is pressed against the inner wall surface of the hollow portion 2a by the centrifugal force acting on the processed molded body and is held without slipping due to the adhesion.

  In parallel, when the air cylinder 5b advances the cutter knife 5a in the standby (retracted) position and the cutting edge 5a-1 is cut into the constricted groove 1e, the first cut-off is performed while the rubber molded body 1 has one extra rotation. Part 1d is cut off. When the second photodetection sensor 7 detects the first cut-off portion 1d that is cut off and separated, the DC motor 4b is stopped and the cutter knife 5a is moved backward.

  As a result of trial tests, the rotational speed of the rubber molded body of this example is optimized to be about 350 RPM. However, the rotational speed can be adjusted to a rotational speed that can be satisfactorily cut according to rubber hardness, cutting thickness, etc. it can. Further, the pressure of the high-pressure air supplied to the air cylinder is regulated by a pressure regulating valve (not shown) so as to be optimal for the cutting operation, and the pressure also acts to buffer the resistance at the time of cutting at the cutting edge.

  Further, in the description of the present embodiment, the lower end portion (first cut-off portion 1d) of the rubber molded body 1 is cut by the cutting means 5, but as shown by the phantom line in FIG. 2 truncation part 1d-1) needs to be truncated. For this purpose, a second cutting means 51 similar to the cutting means 5 described above is provided in the apparatus base 10 as indicated by a virtual line in FIG.

  The cutter knife 5a is set in sliding contact with the upper end surface of the hollow case 2, and the second cutting means 51 is operated substantially simultaneously with the cutting means 5 to simultaneously operate the second cutting section 1d on the lower side. 2 cut-off portion 1d-1 is cut. According to this configuration, since the upper and lower first and second cut-off portions can be cut in one step, the efficiency of the cutting process can be significantly improved.

  In addition to the rubber molded body described above, this cutting device can also be applied to soft resin molded bodies such as vinyl chloride and polypropylene.

  It is a side view including the partial cross section of one Example by this invention.   It is a top view explaining the cutting angle of the cutter knife of FIG.   It is a side view including the partial cross section of the to-be-processed molded object of FIG.

Explanation of symbols

1 Processed molded body (Rubber molded body)
1a upper end ring part 1a-1 step 1b lower end ring part 1c bellows part 1c-1 step 1d first cut-off part 1d-1 second cut-off part (runner)
1e Constriction groove 2 Hollow case 2a Hollow portion 2a-1 First step portion 2b-1 Second step portion 2a-3 Guide groove 2a-4 Gear 3 Support means 10 Device base 3a Bracket 3b Guide roller 4 Rotation drive means 4a Pinion gear 4b DC motor 5 Cutting means 51 Second cutting means 5a Cutter knife 5a-1 Cutting edge 5b Air cylinder 5c Base 6 First light detection sensor (photocoupler)
7 Second light detection sensor (photocoupler)

Claims (2)

A hollow part of a space formed so as to be open and open at both ends and in accordance with the outer shape of the processed molded body so that the processed molded body can be held in a severable manner with only a hollow case is provided. 該被processed compact said cleavable by being positioned in the axial direction to match the cutting position of the first truncated portion of the object to be processed compact to the end face of the lower open end when the charged from the top opening to the that holds the lower open end out to the outer, and the circular cylindrical hollow casing,
Support means for supporting the rotation axis of the hollow case in the vertical direction on the outer periphery of the hollow case and guiding the hollow case in a rotatable manner;
Rotation drive means for driving and rotating a workpiece to be processed together with the hollow case on the outer periphery of the hollow case;
A cutting means for attaching a cutter knife for cutting the first cut-off portion of the workpiece, and for advancing and retracting the side surface of the cutter knife in sliding contact with the opening end surface of the hollow case;
A cutting apparatus comprising:   2. A second cutting device is additionally provided for cutting the second cut-out portion protruding from the upper opening end of the hollow case in synchronism with the cutting means of the first cut-out portion. The cutting device as described.

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