JP2013082026A - Cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting device which has a changeable cutting amount per rotation thereby performing the cutting operation of a high frequency and can be made compact in size.SOLUTION: The cutting device 1 includes: a rotor pulley 3 having a cutter 40; a cam pulley 2 which has a cam groove 21 and a rotary shaft A coincident with that of the rotor pulley 3; and a cam follower 38 which is connected to the cutter 40, comes in slide contact with the cam groove 21 and rotates together with the rotor pulley 3 where a cutting-target object inserting hole 7a penetrating the rotor pulley 3 and the cam pulley 2 is provided, and where the cam follower 38 is guided to the cam groove 21 and moved by a difference between the number of revolutions of the rotor pulley 3 and the cam pulley 2, and the cutter 40 is moved and pushed to the cutting-target object inserted in the cutting-target object inserting hole 7a to cut the cutting matter. In the cutting device 1, the rotor pulley 3 and the cam pulley 2 are independently rotated by first and second driving motors 11 and 12 which separate form each other and have the variable number of revolutions.

Description

  The present invention relates to a cutting apparatus for cutting an object to be cut such as a synthetic resin pipe continuously formed by a pipe forming machine.

  As a synthetic resin pipe cutting device, those described in Patent Documents 1 and 2 below are known.

  The cutting device described in Patent Document 1 has a cam ring and a rotating body each having a differential gear formed on the outer peripheral surface, both differential gears have slightly different numbers of teeth, and both differential gears are simultaneously used for the same input. By being engaged with the gear and being driven to rotate, the cam ring and the rotating body are differentially rotated at slightly different rotational speeds due to the difference in the number of teeth. A cam shaft attached to the tool post is passed through the hole of the flange portion of the rotating body, and a cam follower attached to the tip of the cam shaft is fitted into a cam groove formed in the cam ring. The cam follower moves along the cam groove by the differential rotation of the turret so that the tool post swings and cuts the pipe.

  The cutting device described in Patent Literature 2 includes a first timing pulley and a second timing pulley, and gives a phase difference to both pulleys, thereby allowing a second cam follower provided in the first timing pulley to be moved to a second timing. It moves along the 2nd cam groove formed in the pulley, and it is set as the structure where a cutting blade is pressed on the outer peripheral surface of a pipe with this movement, and a pipe is cut. The drive mechanism that gives a phase difference to both pulleys includes a main motor, a first drive pulley that is directly connected to the main motor and rotates, a differential device for giving a phase difference, and a sub-motor for operating the differential device And a second drive pulley provided on the output shaft of the differential, and the first drive pulley and the first timing pulley, and the second drive pulley and the second timing pulley are connected by belts, respectively. . The differential device includes a first internal gear on the first drive pulley side, a second internal gear on the second drive pulley side, and an internal gear that meshes with both internal gears. A sub-motor is connected to the gear. The first internal gear and the second internal gear have the same diameter and a slightly different number of teeth, and the auxiliary motor is operated to make the internal gear relatively to the first internal gear. When it is rotated once, the phase of the second internal gear is shifted by the difference in the number of teeth with respect to the first internal gear, and a phase difference is given to both pulleys.

JP 7-136981 A JP-A-11-300690

  As in the cutting device described in Patent Document 1, in a cutting device that swings the tool post due to the difference in the number of teeth between the gear provided with the cam groove and the gear provided with the cam follower, the cutting amount per rotation Since it is determined by the difference in the number of teeth of both gears and the shape of the cam groove, it cannot be changed, and there is a problem that it cannot flexibly cope with the change of the workpiece.

  On the other hand, in a cutting device using a differential device, such as the cutting device described in Patent Document 2, the phase difference given to both pulleys can be changed by changing the rotational speed of the internal gear. The amount of insertion is variable, and if the differential is stopped at the time of cutting standby, it is not necessary to stop both pulleys, so that a high-frequency cutting operation is also possible. However, since the differential device has a large number of parts and is large and heavy, there is a problem that the cutting device cannot be reduced in size.

  An object of the present invention is to solve the above-described problem, and to provide a cutting device that can change the cutting amount per rotation, perform a high-frequency cutting operation, and can be miniaturized. To do.

  The cutting device according to the present invention includes a first rotating body provided with a processing tool, a second rotating body provided with a cam so that the first rotating body and a rotating shaft coincide with each other, and the processing tool. And a cam follower that is slidably in contact with the cam and provided to rotate together with the first rotating body, and to insert an object to be cut through the first rotating body and the second rotating body. A hole is provided, and the cam follower is guided and moved by the cam due to a difference in rotational speed between the first rotating body and the second rotating body. In the cutting device that cuts the workpiece by being pressed against the workpiece inserted through the workpiece insertion hole, the first rotating body and the second rotating body are respectively separated from each other. It is configured to rotate independently of each other by a drive device with variable rotation speed. Characterized in that it was.

  According to this, since the first rotating body and the second rotating body rotate independently from each other by separate drive devices having variable rotation speeds, the first rotating body and the second rotating body can be operated without using a large and heavy differential. The number of rotations of the first rotating body and the second rotating body can be made different, and the apparatus size can be reduced. Moreover, since the rotational speed difference between the first rotating body and the second rotating body can be changed by changing the rotational speed of each driving device, the cutting amount per one rotation of the first rotating body can be changed. Yes, if the rotational speeds of the respective driving devices are the same and the rotational speed difference between the first rotating body and the second rotating body is eliminated, the first rotating body and the second rotating body can be added while rotating. Since the movement of the tool can be stopped, it is not necessary to stop the rotation when waiting for cutting, and a high-frequency cutting operation is possible.

  According to the cutting device of the present invention, the cutting amount per rotation can be changed, a high-frequency cutting operation is possible, and the size can be reduced.

It is a schematic longitudinal cross-sectional view which shows the principal part which concerns on one Embodiment of this invention. It is a partially broken front view which concerns on the same embodiment. It is a front view of the rotor pulley which concerns on the same embodiment. It is a front view of the cam pulley which concerns on the same embodiment.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, the cutting device 1 according to the embodiment uses a synthetic resin pipe as an object to be cut, and includes a base plate 4 and a motor bracket 5 attached to the lower surface of the base plate 4. The first drive motor 11 and the second drive motor 12 supported by the motor bracket 5 and provided below the base plate 4, and the first drive pulley 13 attached to the rotational drive shaft 11 a of the first drive motor 11 The second drive pulley 14 attached to the rotary drive shaft 12a of the second drive motor 12, the rotor pulley 3 corresponding to the first rotary body, the cam pulley 2 corresponding to the second rotary body, and the first drive pulley 13 and the first timing belt 15 spanned between the rotor pulley 3 and the second timing belt 16 spanned between the second drive pulley 14 and the cam pulley 2. The first drive motor 11 and the second drive motor 12 are both servo motors, and the number of rotations is variable. In the following description, the traveling direction of the pipe that is the object to be cut is defined as the front (see FIG. 1).

  The 1st drive pulley 13 and the 2nd drive pulley 14 are formed in the disk shape of the same diameter, and the tooth | gear (not shown) formed in the internal peripheral surface of the 1st timing belt 15 and the 2nd timing belt 16, respectively. The first drive pulley 13 and the second drive pulley 14 have the same number of teeth.

  The rotor pulley 3 and the cam pulley 2 are disposed above the base plate 4, and the first timing belt 15 and the second timing belt 16 pass through a through hole 4a formed in the base plate 4 and are respectively driven by the first drive. The pulley 13 and the rotor pulley 3, the second drive pulley 14 and the cam pulley 2 are connected. The rotor pulley 3 and the cam pulley 2 have a circular shape with the same outer diameter when viewed from the front, and teeth that mesh with the teeth formed on the inner peripheral surfaces of the first timing belt 15 and the second timing belt 16, respectively. The rotor pulley 3 and the cam pulley 2 have the same number of teeth.

  The rotor pulley 3 includes a cylindrical cam pulley support portion 31 and a tool attachment portion 32 that spreads in an annular shape around a circular opening at the front end of the cam pulley support portion 31. Through a ball bearing 9 and a bush bracket 8, a cylindrical workpiece insertion part 7 is inserted into a central through hole 33 of the rotor pulley 3 corresponding to a through hole in the cam pulley support part 31. The periphery of the workpiece insertion portion 7 is rotatable, and the rotation axis A thereof coincides with the central axis of the workpiece insertion hole 7 a formed by the workpiece insertion portion 7. The workpiece insertion part 7 is supported by a support member 6 erected on the upper surface of the base plate 4.

  As shown in FIG. 3, the tool attachment portion 32 is formed with a plurality of sets of shaft insertion holes 32 a and connection pin insertion holes 32 b that are separated from the shaft insertion holes 32 a by a predetermined distance. As shown in FIGS. 1 and 2, the rotor pulley 3 is provided with a cutter 40 corresponding to a processing tool using one of the sets of the shaft insertion hole 32 a and the connection pin insertion hole 32 b, A cam follower 38 is connected. Specifically, as shown in FIG. 1, a cutter arm 43 is disposed on the front surface side of the tool mounting portion 32, and an elongated plate-like connecting member is disposed on the rear surface side of the tool mounting portion 32 (that is, the side facing the cam pulley 2). 36 is disposed, and the cutter arm 43 and the connecting member 36 are connected by a fulcrum pin 34 inserted through the shaft insertion hole 32a. The fulcrum pin 34 is rotatably inserted into the shaft insertion hole 32a via the ball bearing 35, and the cutter arm 43 can swing around the fulcrum pin 34 as an axis. A cutter 40 is attached to an end portion of the cutter arm 43 opposite to the fulcrum pin 34 side. The cutter 40 includes a cutting blade 41 and a holder 42 that holds the cutting blade 41. A cam follower 38 is attached to an end of the connecting member 36 opposite to the fulcrum pin 34 side. The cam follower 38 is fitted into a cam groove 21 described later and is in sliding contact with the cam groove 21. Since the cam follower 38 is connected to the fulcrum pin 34 inserted through the rotor pulley 3 via the connecting member 36, the cam follower 38 rotates together with the rotor pulley 3 when the rotor pulley 3 rotates.

  The connecting member 36 and the cutter arm 43 are connected to each other by a connecting pin 39 in the vicinity of the central portion thereof. The front end of the connection pin 39 is inserted into a long hole 43a formed in the cutter arm 43 as shown in FIG. 2, and the rear end is attached to the connection member 36 through the connection pin insertion hole 32b. The connecting pin 39 holds the angle formed by the connecting member 36 and the cutter arm 43. The angle formed by the connecting member 36 and the cutter arm 43 is obtained by loosening the connecting pin 39 and moving it within the elongated hole 43a. The initial position of the cutter 40 can be adjusted, and the angle formed by the connecting member 36 and the cutter arm 43 can be maintained by tightening the connecting pin 39.

  In addition, a pressing roller 45 is disposed in the set of the other shaft insertion hole 32a and the connecting pin insertion hole 32b. The attachment structure of the presser roller 45 is the same as the attachment structure of the cutter 40 described above, and the presser roller 45 is attached instead of the cutter 40.

  The cam pulley 2 is a front cam having a cam groove 21 formed on the front surface, and is formed in a disk shape having a through hole 22 in the center as shown in FIG. The cam groove 21 is formed so as to approach the center of the cam pulley 2 or to move away from the center of the cam pulley 2. As shown in FIG. 1, a cam pulley support portion 31 of the rotor pulley 3 is inserted into the through hole 22 via the bush 10, and the cam pulley 2 is independent of the rotor pulley 3 about the rotation axis A like the rotor pulley 3. It is possible to rotate. Since the workpiece insertion portion 7 is inserted into the cam pulley support portion 31 as described above, the workpiece insertion portion 7 penetrates the cam pulley 2, that is, the workpiece in the workpiece insertion portion 7. The insertion hole 7 a passes through the cam pulley 2 and the rotor pulley 3.

  On the base plate 4, a chuck device (not shown) for gripping a pipe (not shown) as an object to be cut is disposed in front of the rotor pulley 3 and behind the cam pulley 2. ing. Further, since the pipe that is the object to be cut is continuously formed by the pipe forming machine and advances, the cutting device 1 and each chuck device are moved forward together with the base plate 4 at the same speed as the pipe moving speed from the initial position. A moving mechanism (not shown) that moves and returns to the initial position is provided.

  Next, the operation of the cutting apparatus 1 configured as described above will be described.

  The pipe that is the workpiece is inserted into the workpiece insertion hole 7a and advances forward at a predetermined speed. When waiting for cutting, the first drive motor 11 and the second drive motor 12 are driven at the same rotational speed (rotational speed) while the cutter 40 is in the initial position. Then, the first drive pulley 13 and the second drive pulley 14 have the same number of teeth, and the rotor pulley 3 and the cam pulley 2 have the same number of teeth, so there is no difference in the rotation speed between the rotor pulley 3 and the cam pulley 2. . Accordingly, the relative positional relationship between the rotor pulley 3 and the cam pulley 2 does not change, and the cam follower 38 stays at the same position in the cam groove 21, so that the cutter 40 does not move.

  At the time of cutting, the first drive motor 11 and the second drive motor 12 are driven at different rotational speeds while moving the cutting device 1 forward at the same speed as the pipe traveling speed. Then, a difference occurs in the rotational speeds of the rotor pulley 3 and the cam pulley 2, and the relative positional relationship between the rotor pulley 3 and the cam pulley 2 is changed by this difference. Or move away from the center of the cam pulley 2. As the cam follower 38 moves, the connecting member 36 and the cutter arm 43 swing around the fulcrum pin 34, the cutter 40 moves in the radial direction, and the cutting blade 41 of the cutter 40 moves the workpiece insertion hole 7a. It is pressed against the pipe inserted in or removed from the pipe. The pipe is cut by pressing the cutting blade 41. Each time the pipe is cut, the cutting device 1 is returned to the initial position.

  The cutting amount (cutting depth) of the cutting blade 41 per one rotation of the rotor pulley 3 (while the rotor pulley 3 makes one rotation) is the rotation amount of the cam pulley 2 during one rotation of the rotor pulley 3, that is, the rotor pulley 3 It is determined by the difference in the rotational speed of the cam pulley 2. Therefore, if the rotational speed difference between the rotor pulley 3 and the cam pulley 2 is changed by changing the rotational speed difference between the first drive motor 11 and the second drive motor 12, the amount of cut per rotation of the rotor pulley 3 changes. If the rotational speed difference between the rotor pulley 3 and the cam pulley 2 is increased, the amount that the cam follower 38 moves through the cam groove 21 during one rotation of the rotor pulley 3 increases, and the amount of cut increases. On the other hand, if the rotational speed difference between the rotor pulley 3 and the cam pulley 2 is reduced, the cutting depth is reduced.

  As described above, according to the cutting device 1, the rotor pulley 3 and the cam pulley 2 rotate independently of each other by the first drive motor 11 and the second drive motor 12 with variable rotation speeds, respectively, so that they are large and heavy. The rotational speed of the rotor pulley 3 and the cam pulley 2 can be made different without using a differential device, and the device size can be reduced.

  The differential device requires overhaul and requires a large maintenance load. However, the cutting device 1 does not use the differential device, and the first drive motor 11 and the second drive motor 12 are independent of each other from the rotor pulley 3 and the cam pulley 2. Since the structure rotates, the maintenance burden is small and it can be said that it is substantially maintenance-free.

  Further, if the rotational speeds of the first drive motor 11 and the second drive motor 12 are the same and the rotational speed difference between the rotor pulley 3 and the cam pulley 2 is eliminated, the cutting blade 41 is moved while the rotor pulley 3 and the cam pulley 2 are rotated. Therefore, it is not necessary to stop the rotation when waiting for cutting, and a high-frequency cutting operation is possible.

  Further, since the rotational speed difference between the rotor pulley 3 and the cam pulley 2 can be changed by changing the rotational speed of the first drive motor 11 and / or the second drive motor 12, the cut amount per rotation of the rotor pulley 3 (cutting speed). Speed).

  In the above embodiment, the cam pulley 2 is provided with the front cam. However, the cam pulley 2 may be provided with another cam such as a plate cam other than the front cam.

  Moreover, the 1st drive motor 11 and the 2nd drive motor 12 should just be a drive device which can change rotation speed not only with a servomotor.

  Moreover, in the said embodiment, although the cutter 40 was used as a processing tool, the processing tool should just be a thing which can cut | disconnect a to-be-cut object, For example, a bite may be sufficient.

  Moreover, in the said embodiment, although the center axis | shaft of the to-be-cut object insertion hole 7a corresponds to the rotating shaft A, the center axis of the to-be-cut object insertion hole 7a does not necessarily need to correspond to the rotating shaft A. .

DESCRIPTION OF SYMBOLS 1 ... Cutting device 2 ... Cam pulley (2nd rotary body)
3 ... Rotor pulley (first rotating body)
7a ... object insertion hole 11 ... first drive motor (drive device)
12 ... Second drive motor (drive device)
38 ... Cam follower 40 ... Cutter (processing tool)

Claims (1)

A first rotating body provided with a processing tool, a second rotating body provided with a cam and having a rotating shaft coincided with the first rotating body, and connected to the processing tool and slid on the cam. A cam follower provided so as to contact and rotate with the first rotating body, and a workpiece insertion hole penetrating the first rotating body and the second rotating body is provided. The cam follower is guided and moved by the cam due to a difference in rotational speed between the first rotating body and the second rotating body, and the processing tool moves along with the movement to be inserted into the workpiece insertion hole. In the cutting device for cutting the object to be cut by being pressed against the object to be cut,
A cutting apparatus, wherein the first rotating body and the second rotating body are configured to rotate independently of each other by separate drive devices having variable rotation speeds.

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