JP2009101429A - Long material cutting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the dimensional accuracy of long members of predetermined dimensions when the long members are sequentially formed by sequentially cutting long members fed out continuously. <P>SOLUTION: This cutting device 1 comprises: a movable base 18 reciprocatingly movable A, B forward; a chuck device 20 supported on the movable base 18 and capable of holding C and unholding a part 19 of the long member 2 in the longitudinal direction; a cutter 21 supported on the movable base 18, disposed near the rear of the chuck device 20, and cutting the long member 2; and a pneumatic cylinder 23 capable of biasing the movable base 18 forward. While the chuck device 20 holds C the part 19 of the long member 2 in the longitudinal direction of the long member, the air cylinder 23 biases the movable base 18 forward to prevent the portion 29 of the long member 2 extending from a feeder 7 to the part 19 of the long member 2 from being loosened for reciprocatingly moving A the movable base 18. During the movement A of the movable base 18, the portion 29 of the long member 2 is cut by the cutter 21. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a long material cutting apparatus for cutting long materials that are continuously fed out and forming long products of a predetermined length one after another in an extrusion molding device for long materials. Is.

  Conventionally, there is a long material cutting apparatus disclosed in Patent Document 1 below. According to this publication, there is provided an extrusion molding apparatus for molding a resin tube which is a long material. In addition, a cutter blade is provided that cuts long materials that are extruded from the extrusion molding apparatus and are continuously fed out to form long products of a predetermined length one after another. The cutter blade is driven to rotate around an axis parallel to the longitudinal direction at a predetermined timing to cut the long material one after another in a direction orthogonal to the longitudinal direction.

When the long material is a medical catheter, the diameter of the long material is generally 0.4 to 10 mm. The moving speed of the long material is substantially constant and is in the range of 5 to 20 m / min, and the cutter blade rotates 0.003 to 0.05 sec / times in the orthogonal direction with respect to the long material. The above cut is made by traversing at speed.
JP-A-8-118290

  By the way, at the time of cutting a long material as described above, the cutting is performed by the cutter blade crossing the long material in the orthogonal direction while the long material is moving in the longitudinal direction. For this reason, first, at the moment of cutting, the cutter blade prevents the long material from moving in the longitudinal direction for a very short time. At this time, a compressive force in the longitudinal direction of the long material is applied from the cutter blade to the cut surface of the long material, and the long material tends to be deformed so that its diameter is increased. Become. This is not preferable because it reduces the dimensional accuracy of the long material.

  Secondly, even at the moment of cutting, the long material moves in the longitudinal direction. For this reason, the cut surface of the long material by the cutter blade rotating in the orthogonal direction is slightly inclined with respect to the orthogonal direction, which also decreases the dimensional accuracy of the long product. It is not preferable.

  The present invention has been made paying attention to the above-mentioned circumstances, and the object of the present invention is to cut long materials continuously fed one after another and form long products of a predetermined size one after another. In this case, the dimensional accuracy of the long product is to be improved.

The invention of claim 1 is provided with a feeding device 7 for continuously feeding the long material 2 toward the front in the longitudinal direction, and the long material 2 to be fed is cut one after another to make a long product of a predetermined length. In the long material cutting apparatus which shape | molds 5,
A movable base 18 provided so as to be able to move forward and backward A and B, and a chuck device that is supported by the movable base 18 and that allows a portion 19 in the longitudinal direction of the long material 2 to be clamped C and released. 20, a cutting machine 21 that is supported by the movable base 18 and is disposed in the vicinity of the rear of the chuck device 20 and that cuts the long material 2, and enables the movable base 18 to be biased forward. A pneumatic cylinder 23;
In a state in which a part 19 in the longitudinal direction of the long material 2 is sandwiched by the chuck device 20, a portion 29 of the long material 2 from the delivery device 7 to the part 19 of the long material 2 is formed. The pneumatic cylinder 23 urges the movable table 18 forward so that no slack occurs, and the movable table 18 moves forward A. During the forward movement A of the movable table 18, the long material 2 The long material cutting apparatus is characterized in that the portion 29 is cut by the cutting machine 21.

  The invention according to claim 2 is characterized in that the cutting machine 21 has a nipper structure that cuts the long material 2 by clamping D from the direction perpendicular to the longitudinal direction thereof. A material cutting device.

  According to the invention of claim 3, the delivery device 7 continuously forms the long material 2 by passing the extruder 9 that melts and extrudes the resin 8 and the resin 8 extruded from the extruder 9. The die 10 for feeding the long material 2 forward, the take-up machine 11 for taking up the long material 2 fed from the die 10 from the die 10 side, and the die 10 and the take-up machine 11 are interposed between the die 10 and the take-up machine 11. The long material cutting device according to claim 1 or 2, further comprising a cooling device (12) which is provided and cools and solidifies the long material (2).

  According to a fourth aspect of the present invention, the long material 2 includes a metal wire 4 that extends in the longitudinal direction and is embedded in the long material 2. Cutting device.

  In addition, in this section, the reference numerals and drawing numbers appended to the above terms are not intended to limit the technical scope of the present invention to the “Example” section and the contents of the drawings described later.

  The effects of the present invention are as follows.

The invention of claim 1 includes a feeding device that continuously feeds the long material forward in the longitudinal direction thereof, and cuts the long material to be fed one after another to form a long product having a predetermined length. In a long material cutting device,
A movable base that can be moved forward and backward, a chuck that is supported by the movable base, and that can clamp and release a part of the long material in the longitudinal direction, and is supported by the movable base. And a cutting machine that is disposed in the vicinity of the back of the chuck device and cuts the long material, and a pneumatic cylinder that can bias the movable base forward.
The pneumatic cylinder so as not to sag in a portion of the long material from the feeding device to a part of the long material in a state where a part of the long material in the longitudinal direction is held by the chuck device. The movable table is urged forward to move the movable table forward, and the long material portion is cut by the cutting machine during the forward movement of the movable table.

  For this reason, at the time of cutting the long material continuously fed forward, the chuck device supported by the movable table sandwiches a part of the long material, and the movable table is separated from the long material. Move forward at the same speed. Therefore, the cutting machine supported by the movable table also moves forward at the same moving speed as the long material, that is, the relative speed between the long material portion and the cutting machine becomes zero. And in this state, the part of the said elongate material is cut | disconnected with a cutting machine, and a elongate article is shape | molded.

  As a result, first, at the time of cutting, due to the presence of the relative speed described in the prior art, a compressive force in the longitudinal direction of the long material is applied from the cutting machine to the cutting surface of the long material. For this reason, it is prevented that the diameter of the long material is increased due to the compressive force. Therefore, the dimensional accuracy of the long product is improved.

  Second, as described above, since the relative speed of the long material portion and the cutting machine is zero, the cutting surface of the long material by this cutting machine is inclined with respect to the orthogonal direction. Is prevented. Therefore, also in this respect, the dimensional accuracy of the long product is improved.

  In addition, the above-described configuration in which the relative speed between the long material portion and the cutting machine is made zero is preferable because the electric motor is not required, and thus the configuration and control of the cutting device are simpler.

  According to a second aspect of the present invention, the cutting machine has a nipper structure in which the long material is clamped and cut from a direction orthogonal to the longitudinal direction.

  For this reason, when the long material is cut, the long material is given an external force in the orthogonal direction from the cutting machine and is bent in the orthogonal direction, thereby generating a tensile force in the longitudinal direction. It is prevented by the nipper structure that the material is deformed so that the diameter of the material becomes small, by being clamped and cut from the orthogonal direction. Therefore, the dimensional accuracy of the long product is further improved.

  According to a third aspect of the present invention, there is provided an extruder in which the delivery device heats and extrudes the resin and the resin extruded from the extruder is continuously formed to form the long material. A die that feeds out the front, a take-up machine that takes out the long material fed from the die from the die side, and a cooling that is interposed between the die and the take-up machine to cool and solidify the long material Device.

  Here, the resin-made long material molded as described above is easily deformed by an external force at the time of cutting by a cutting machine, but since this long material is cut by the cutting device, it is long. Good dimensional accuracy is ensured for the scale.

  According to a fourth aspect of the present invention, the long material includes a metal wire that extends in the longitudinal direction and is embedded in the long material.

  Here, the metal wire is likely to have a large resistance when the long material is cut. For this reason, the long material may be greatly bent in the orthogonal direction by the cutting. However, since the cutting machine has a nipper structure, the dimensional accuracy of the long product is improved as described above.

  The long material cutting apparatus according to the present invention improves the dimensional accuracy of a long product that has been continuously fed and is continuously cut to form a long product of a predetermined size. The best mode for carrying out the present invention in order to realize the purpose of making it happen is as follows.

  That is, the long material cutting device includes a feeding device that continuously feeds the long material toward the front in the longitudinal direction, and cuts the long material to be sent out one after another to obtain a long product having a predetermined length. Is molded.

  The cutting device includes a movable base that can be moved forward and backward, a chuck device that is supported by the movable base and that can sandwich and release a part of the long material in the longitudinal direction; and A cutting machine that is supported by the movable base and is disposed in the vicinity of the rear of the chuck device, and that cuts the long material, and a pneumatic cylinder that can bias the movable base forward.

  The pneumatic cylinder so as not to sag in a portion of the long material from the feeding device to a part of the long material in a state where a part of the long material in the longitudinal direction is held by the chuck device. The movable table is urged forward to move the movable table forward, and the long material portion is cut by the cutting machine during the forward movement of the movable table.

  In order to explain the present invention in more detail, an embodiment thereof will be described with reference to the accompanying drawings.

  In the figure, reference numeral 1 denotes a cutting device for the long material 2. An arrow Fr indicates the front of the long material 2 in the moving direction. The long material 2 is a medical catheter material, and can be embedded in a resin-made multiple circular tube 3 and the axial center of the circular tube 3 extending in the longitudinal direction of the long material 2. And a flexible metal wire 4. For example, the circular tube 3 has a diameter of 0.4 to 10 mm, and the metal wire 4 has a diameter of 0.2 to 3 mm.

  The cutting device 1 cuts the long material 2 to form long products 5 having a predetermined length one after another. And if the said metal wire 4 is extracted from this elongate article 5 and given predetermined process, a catheter will be obtained.

  The cutting device 1 includes a feeding device 7 that feeds the long material 2 toward the front in the longitudinal direction at a substantially constant speed. The delivery device 7 is specifically an extrusion molding device for continuous molding of the long material 2, and the moving speed of the long material 2 after being delivered is in the range of 5 to 20 m / min.

  The delivery device 7 introduces different types of thermoplastic resins 8 from each other, while a plurality of screw type extruders 9 that melt and extrude the resins 8 and the resins 8 extruded from the extruders 9 respectively. At the same time, the metal wire 4 is sequentially embedded in the resin 8 to form the long material 2, the die 10 for feeding the long material 2 forward, and the long length fed from the die 10. A take-up machine 11 for picking up the material 2 from the die 10 side, a cooling device 12 interposed between the die 10 and the take-up machine 11 to cool and solidify the long material 2 with water, and the above devices The base 13 which supports 9-12 is provided.

  The cutting device 1 is provided in the vicinity of the front of the take-up machine 11 of the delivery device 7 and a support base 16 projecting from the front end of the base 13 and projecting in parallel from the support base 16 toward the front. A pair of upper and lower guide shafts 17 and 17 and a predetermined stroke S in the longitudinal direction of the elongate material 2 are supported by the guide shafts 17 and 17 so that they can move forward and move backwards A and B within a predetermined stroke S. And a pneumatically operated chuck device 20 that is supported by the movable table 18 and that allows the portion 19 in the longitudinal direction of the long material 2 to be clamped C and released (in the opposite direction to the clamp C). And.

  The cutting device 1 is supported by the movable base 18 and is disposed in the vicinity of the rear of the chuck device 20, and a pneumatically operated cutting machine 21 for cutting the long material 2 and the movable base 18. And a guide body 22 that is supported and disposed near the rear of the cutting machine 21 and guides the long material 2 so as not to be displaced in the radial direction. The cutting machine 21 includes the long material 2 in its longitudinal direction. It is set as the nipper structure cut | disconnected by the clamping pressure D from the orthogonal direction to a direction.

  Further, the cutting device 1 includes a pneumatic cylinder 23 that can be energized so as to move the movable table 18 forward and backward. The pneumatic cylinder 23 includes a piston rod as the guide shaft 17, a cylinder tube as the movable base 18, and a piston 24 supported by the guide shaft 17. And the piston 24 are externally fitted so that the movable table 18 can be moved back and forth. The movable table 18 is partitioned into two pneumatic chambers 25 and 26 by the piston 24.

  And by operation | movement of the said delivery apparatus 7, the elongate material 2 is continuously sent out toward the front of the longitudinal direction from this delivery apparatus 7 toward the front. In this case, as shown in each drawing, the chuck device 20 is in a released state of the clamping C and is in an open state. The cutting machine 21 is also in a released state of the clamping pressure D and is in a state where the nipper is opened. For this reason, regardless of the chuck device 20 or the cutting machine 21, the long material 2 is fed forward. The movable table 18 is positioned at the rear end of the predetermined stroke S, which is the starting point of the forward movement A, and is in a standby state.

  When the long material 2 is cut, the chuck device 20 sandwiches a part 19 in the longitudinal direction of the long material 2 at a predetermined timing. At this time, the pressurized air E is introduced into one of the pneumatic chambers 25 and 26 in the movable table 18 of the pneumatic cylinder 23, and the other pneumatic chamber 26 is opened to the outside. Then, the movable table 18 is urged by the pressurized air E and moves forward A.

  At this time, the chuck device 20 supported by the movable table 18 sandwiches a part 19 of the long material 2, and the movable table 18 moves forward A at the same movement speed as the long material 2. . Further, due to the forward movement A of the movable table 18, the chuck device 20 supported by the movable table 18 pulls a part 19 of the long material 2 forward. Then, a slight tensile force is applied to the portion 29 of the long material 2 from the outlet portion of the take-up machine 11 of the delivery device 7 to the portion 19 of the long material 2, and the portion 29 is slackened. Is prevented from occurring.

  In the state where the chuck device 20 supported by the movable base 18 holds the part 19 of the long material 2 as described above, the cutting is performed together with the long material 2, the movable base 18, and the chuck device 20. The machine 21 also moves forward A. At this time, the relative speed between the portion 29 of the long material 2 and the cutting machine 21 becomes zero. Then, during the forward movement A of these 2, 18, 20, and 21, the portion 29 of the long material 2 is cut and clamped by the cutting machine 21 to form the long product 5.

  When the movable table 18 reaches the front end portion of the predetermined stroke S after the long material 2 is cut by the cutting machine 21, the chuck device 20 and the cutting machine 21 are both opened as shown in the drawings. The Further, the pressurized air F is introduced into the other pneumatic chamber 26 in the movable table 18 of the pneumatic cylinder 23, and the one pneumatic chamber 25 is opened to the outside. As a result, the movable table 18 is returned to the rear end portion of the predetermined stroke S and returned to the standby state.

  Thereafter, by repeating the above operation, the long product 5 is formed one after another.

According to the above configuration, the movable base 18 provided so as to be able to move forward and backward A and B, and the part 19 in the longitudinal direction of the long material 2 are sandwiched C and sandwiched by the movable base 18. A chuck device 20 that can be released, a cutting device 21 that is supported by the movable table 18 and is disposed in the vicinity of the rear of the chuck device 20 to cut the long material 2, and the movable table 18 is directed forward. A pneumatic cylinder 23 that can be biased,
In a state in which a part 19 in the longitudinal direction of the long material 2 is sandwiched by the chuck device 20, a portion 29 of the long material 2 from the delivery device 7 to the part 19 of the long material 2 is formed. The pneumatic cylinder 23 urges the movable table 18 forward so that no slack occurs, and the movable table 18 moves forward A. During the forward movement A of the movable table 18, the long material 2 This portion 29 is cut by the cutting machine 21.

  For this reason, at the time of cutting the long material 2 that is continuously fed forward, the chuck device 20 supported by the movable base 18 sandwiches a part 19 of the long material 2 and holds the movable material. The stage 18 moves forward A at the same movement speed as that of the long material 2. Therefore, the cutting machine 21 supported by the movable table 18 also moves forward A at the same movement speed as the long material 2, that is, the relative speed between the portion 29 of the long material 2 and the cutting machine 21 is zero. Become. In this state, the portion 29 of the long material 2 is cut by the cutting machine 21 to form the long product 5.

  As a result, first, at the time of cutting, due to the presence of the relative speed described in the prior art, the cutting machine 21 heads in the longitudinal direction of the long material 2 with respect to the cut surface of the long material 2. It is prevented that a compressive force is applied. For this reason, the compressive force is also prevented from being deformed so that the diameter of the long material 2 is increased. Therefore, the dimensional accuracy of the long product 5 is improved.

  Second, since the relative speed of the portion 29 of the long material 2 and the cutting machine 21 is zero as described above, the cutting surface of the long material 2 by the cutting machine 21 is in the orthogonal direction. Inclination is prevented. Therefore, also in this respect, the dimensional accuracy of the long product 5 is improved.

  In addition, since the configuration in which the relative speed between the portion 29 of the long material 2 and the cutting machine 21 is zero is achieved without the need for an electric motor, the configuration and control of the cutting device 1 become simpler. preferable.

  In addition, as described above, the cutting machine 21 has a nipper structure that cuts the long material 2 by clamping D from the direction orthogonal to the longitudinal direction.

  For this reason, when the long material 2 is cut, the long material 2 is given an external force in the orthogonal direction from the cutting machine and bends in the orthogonal direction, thereby generating a tensile force in the longitudinal direction. The deformation of the long material 2 so as to reduce the diameter is prevented by the nipper structure in which the long material 2 is cut with the clamping pressure D from the orthogonal direction. Therefore, the dimensional accuracy of the long product 5 is further improved.

  Further, as described above, the delivery device 7 continuously forms the long material 2 by passing the extruder 9 that melts and extrudes the resin 8 and the resin 8 that is extruded from the extruder 9. The die 10 for feeding the long material 2 forward, the take-up machine 11 for taking up the long material 2 sent from the die 10 from the die 10 side, and the interposition between the die 10 and the take-up machine 11 And a cooling device 12 for cooling and solidifying the long material 2.

  Here, the resin-made long material 2 molded as described above is easily deformed by an external force at the time of cutting by the cutting machine 21, but the long material 2 is cut by the cutting device 1. Therefore, good dimensional accuracy is ensured for the long product 5.

  Further, as described above, the long material 2 includes the metal wire 4 that extends in the longitudinal direction and is embedded in the long material 2. Cutting device.

  Here, the metal wire 4 is likely to have a large resistance when the long material 2 is cut. Therefore, the long material 2 may be greatly bent in the orthogonal direction by the cutting. However, since the cutting machine 21 has a nipper structure, the dimensional accuracy of the long product 5 is improved as described above.

  In addition, although the above is based on the example of illustration, the elongate material 2 is not limited to a catheter, The thing of another use may be sufficient. Further, the metal wire 4 may be omitted. The cutting machine 21 may be a rotary cutter blade.

FIG. 4 is a side view of what is shown in FIG. 3. It is a whole top view of a cutting device. FIG. 3 is a partially enlarged detail view of FIG. 2. It is a fragmentary perspective view of a chuck device and a cutting machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cutting device 2 Long material 3 Circular tube 4 Metal wire 5 Long product 7 Delivery device 8 Resin 9 Extruder 10 Die 11 Take-out machine 12 Cooling device 16 Supporting stand 17 Guide shaft 18 Movable stand 19 Part 20 Chuck device 21 Cutting Machine 22 Guide body 23 Pneumatic cylinder 29 Part A Forward movement B Reverse movement C Clamping D Clamping pressure E Pressurized air F Pressurized air S Predetermined stroke

Claims (4)

In a long material cutting apparatus comprising a feeding device for continuously feeding a long material toward the front in the longitudinal direction, and cutting the long material to be fed one after another to form a long product of a predetermined length ,
A movable base that can be moved forward and backward, a chuck that is supported by the movable base, and that can clamp and release a part of the long material in the longitudinal direction, and is supported by the movable base. And a cutting machine that is disposed in the vicinity of the back of the chuck device and cuts the long material, and a pneumatic cylinder that can bias the movable base forward.
The pneumatic cylinder so as not to sag in a portion of the long material from the feeding device to a part of the long material in a state where a part of the long material in the longitudinal direction is held by the chuck device. The movable table is urged forward to move the movable table forward, and the long material portion is cut by the cutting machine during the forward movement of the movable table. Long material cutting device.   2. The long material cutting apparatus according to claim 1, wherein the cutting machine has a nipper structure that clamps and cuts the long material from a direction orthogonal to the longitudinal direction thereof.   An extruder that heats and extrudes the resin to extrude, and a die that continuously forms the long material through the resin extruded from the extruder, and sends the long material forward, A take-up machine that takes out the long material fed from the die from the die side, and a cooling device that is interposed between the die and the take-up machine to cool and solidify the long material. The long material cutting device according to claim 1 or 2, wherein   The long material cutting apparatus according to claim 2, wherein the long material includes a metal wire extending in the longitudinal direction and embedded in the long material.

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