JPS63216617A - Cutting method and device for pipe material - Google Patents

Abstract

PURPOSE:To reduce a pipe material cutting time by moving while revolving plural disk type cutters which are placed at the equal distance from the center axis of said pipe material and moving while revolving said cutters toward the center of the pipe material. CONSTITUTION:A doughnut shaped rotary support base 1 and a rotary base 2 having the same shape are rotatably supported by a support base 3 through the center of which a paper tube P passes, and rotated. Plural disk type cutters 6 are supported on the rotary support base 1 via swinging arms 7, at the equal distance in the radial direction. The swinging arm 7 is rotatably installed on the front face of the rotary support base 1 by means of a rotatable support pin 9 on its center part, and the cutter 6 is rotatably mounted on a support shaft 10 on one end part of the arm 7. Also, the other end of it is rotatably supported by an interlocking pin 11 which extends rearward through the long hole 12 of the rotary support base 1. The interlocking pin 11 is swung in the direction of a center line by means of a cam 14 provided on the rotary base 2 in the rear and due to the rotation of the rotary support base 1, and the cutter 6 is pressed against the paper tube P and retracted while being revolved, and this operation is repeated. Hence, the operation of the cutter is adjusted by controlling the rotation of each of the rotary support base 1 and the rotary base 2.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates primarily to a method and apparatus for cutting pipe materials such as paper tubes and plastic tubes.

(Prior art and its problems) For example, a paper tube is rolled up by a paper tube manufacturing machine, taken out in an endless shape while rotating, and then cut to a desired length by a disc-shaped cutter that moves along with the paper tube. be done. In this case, the disc-shaped cutter has conventionally been generally installed at one location on the outer periphery of the paper tube (usually at a position directly above the paper core), and when cutting, the disc-shaped cutter is rotated or rotated freely. In this state, it is moved in a direction perpendicular to the axis of the paper tube and is pressed against the outer peripheral surface of the paper tube while cutting.

According to this cutting method, the wall thickness of the paper tube is 5 to 6■■
This is not a problem if the thickness is relatively thin, but if the thickness exceeds g -10 mm or even 5 **, the time required for seven cuts becomes considerably long. In other words, the disc-shaped cutter, which moves along with the paper tube, remains stationary at a fixed position around the outer periphery of the paper tube, and cuts into the paper tube in the circumferential direction as the paper tube rotates. For example, if the paper tube has a wall thickness of 8 iris and the cutting depth per rotation of the paper tube is /■■, the cutting process will not be completed unless the paper tube rotates 8 times. Therefore, since the rotation speed of the paper tube is not that fast, it takes a considerable amount of time to cut seven times, and since the paper tube advances while rotating, it rotates eight times from the cutting starting point. During this time, the disc-shaped cutter also moves a considerable distance. Therefore, in the case of conventional thick-walled paper tubes, the moving stroke of the disc-shaped cutter becomes long as described above, making it difficult to cut efficiently and making the cut edges ugly. The rolled paper tube is first roughly cut into appropriate long lengths using a special rough cutting device, and then the rough cut material is gripped at both ends with chucks in another cutting device and cut into a cutter. However, if such rough cutting is performed, there will always be uncut portions when re-cutting the paper tube of each unit length individually, and it will also be caught by the chuck when re-cutting. Both ends have molds and cannot be used as a product, so they have to be cut off.

(Technical Means for Solving the Problems) In view of the above circumstances, the present invention is capable of cutting thick-walled pipe materials in an extremely short period of time, and is capable of cutting thick-walled pipe materials in a very short time. To provide a cutting method and device capable of shortening the moving stroke of a cutter when cutting a pipe material fed while rotating with a cutter that moves along with the pipe material. To achieve this objective, the cutting method of the present invention uses a plurality of disc-shaped cutters at equal distances in the radial direction from the central axis of the pipe material to be cut and at equal intervals from each other in the circumferential direction around the pipe material to be cut. The method is characterized in that the pipe material is cut by disposing the disc-shaped cutters at positions and rotating the disc-shaped cutters around the central axis of the pipe material, while moving each disc-shaped cutter from a predetermined position toward the center of the pipe material.

Further, the cutting device of the present invention includes a rotating support having a rotation center coaxial with the central axis of the pipe material to be cut, and a rotation support having a rotation center coaxial with the center axis of the pipe material to be cut, and a rotation support having a rotation center coaxial with the rotation support, and a rotation support having a rotation center that is equidistant from the rotation center of the rotation support in the radial direction and equidistant from each other in the circumferential direction. a plurality of disc-shaped cutters supported on the rotary support base at positions; a non-cutting position for these disc-shaped cutters; and a pipe material cutting position spaced from the non-cutting position toward the center of the rotary support base. It is characterized by comprising a cutter actuating means for reciprocating between the cutter actuating means and a driving means for controlling rotation of the rotary support and driving of the cutter actuating means.

Furthermore, another cutting device of the present invention includes a rotation support having a rotation center coaxial with the central axis of the pipe material to be cut, a driving means for rotationally driving the rotation support, and a rotation center of the rotation support. a plurality of disc-shaped cutters supported on the rotary support base at positions equidistant from each other in the radial direction and equidistant from each other in the circumferential direction; It is characterized by comprising a cutter actuating means for reciprocating the cutter actuating means to and from a tube material cutting position spaced apart from the center of the rotary support base, and a driving means for driving the cutter actuating means.

(Example) An embodiment of the present invention will be described below based on the drawings.

FIG. 1 shows an overall view of the thin tube cutting device, and FIGS. 2 and 3 show the main parts thereof in a front view and a separated perspective view.

In these figures, l is a donut-shaped rotating support, 2 is a rotating table of the same shape, and 3 is a support tube that supports these, which is wound into a spiral shape by a paper tube manufacturing machine (not shown). Paper tube P is fed in the direction of the arrow while rotating.
The rotary support base 1 and the rotary base 2 are arranged on the outer circumferential side of the paper tube P so as to have the same axis as the central axis β of the paper tube P, and the rotary support base 1 and the rotary base 2 are connected to the support tube 3 via bearings 4 and 5 at appropriate intervals in the axial direction. Therefore, the rotary support base 1 and the rotary base 2 are rotatable with their rotation centers coaxial with the central axis P of the paper 'IP'. 6゜6.6 are disc-shaped cutters of the same shape, and these are always mounted on the rotating support base 1.
and the rotation center of the rotary table 2 (i.e., the central axis p of the paper tube P)
The rotary supports 1 are respectively supported via swing arms 7 so as to be positioned equidistantly from each other in the radial direction and equally spaced from each other in the circumferential direction. It revolves around the central axis β of the pipe P. Further, these disc-shaped cutters 6.6.6 are moved to a predetermined non-cutting position (2 in FIG.
(the position shown by the dotted chain line) and the cutting position (the position shown by the solid line in FIG. 2) which can reach the inner circumferential surface of the paper tube P at a distance from this non-cutting position toward the center of the rotary support base 1. Each can be moved back and forth between the two. Therefore, while these disc-shaped cutters 6.6.6 revolve due to the rotation of the rotary support base 1, each cutter 6 is rotated by the cutter actuating means.
By moving from the non-cutting position to the cutting position,
The paper tube P is cut.

Each of the above-mentioned swing arms 7 has a substantially angular shape to form a hell crank, and its center portion is pivoted to a predetermined position on the front side of the rotary support base 1 by a pivot pin 9, so that the swing arm A cutter support shaft 10 is integrally provided at one end of the arm 7 and protrudes forward, and a disk-shaped cutter 6 is rotatably attached to the tip thereof, and an interlocking pin II is attached to the other end of the swing arm 7.
is provided protruding in the opposite direction to the cutter support shaft 10, and this interlocking pin 11 is inserted in the axial direction through an elongated hole 12 provided through the rotation support base l, and a cam driven rotor is attached to the tip of this interlocking pin 11. 13 is attached, and this cam driven rotor 13 is removably engaged with a force groove 14 provided on the front side of the rotary table 2. As shown in FIGS. 2 and 3, this cam groove 14 is an endless groove having a substantially triangular shape. The position where each cam driven rotor 13 is illustrated in FIGS. Accordingly, it has a shape that gradually approaches the rotation center and approaches the center at the trough at the other end. Moreover, as is clear from these FIGS. 2 and 3, each cam driven rotor 13
When the cam groove 14 is located at the crest of each groove 14a, each disc-shaped cutter 6 is located at the cutting position. Therefore, if the rotary base 2 is kept stationary and the rotary support base 1 is rotated clockwise from the positions shown in FIGS. 2 and 3, the rotary support base 1 will rotate approximately 30'. At this point, each cam driven rotor 13, which was initially located at the crest, reaches the trough of the next adjacent groove 14a, and as a result, each disc-shaped cutter 6 moves from the cutting position shown by the solid line in FIG. It retreats to the non-cutting position shown by the two-dot chain line in the figure. Each disc-shaped cutter 6 is always on standby at this non-cutting position. From this non-cutting position, the rotary support base 1
As the cam rotates clockwise, each cam driven rotor 13 moves from the trough of the groove 14a toward the crest, and as a result, each disc-shaped cutter 6 approaches the center of the rotary support 1. When the rotary support base 1 rotates approximately 90 degrees and each cam driven rotor 13 is located at the crest of the groove 14a, each disc-shaped cutter 6 reaches the cutting position. At this position, the paper tube P will be completely cut. Subsequently, the rotary support 1 further rotates approximately 30 degrees, and each cam driven rotor 13 reaches the trough of the adjacent groove 14a, so that each disc-shaped cutter 6 retreats to the non-cutting position in a short time. become.

The force/7 force actuating means 8 is connected to each swinging arm 7 which is pivotally connected to the rotational support 1, and which is protruded from one end of each swinging arm 7 and is inserted through the rotational support 1 to the rotational support 1. Each interlocking pin 11 extending to the side, a cam driven rotor 13 provided at the tip end of each interlocking pin 11, and each cam driven rotor provided on the opposing surface of the rotary support base 1 on the rotary table 2. 13 engages with a cam groove 14, each swinging arm 7 is swung through a drive means 16, which will be described later, to reciprocate the disc-shaped cutter 6 between a non-cutting position and a cutting position. This is what I did.

Support pipe 3 supporting the rotation support table 1 and rotation table 2
are appropriately fixed on a movable table 15 schematically shown in FIG.
A drive means 16 is provided for driving the cutter actuating means 8 as well as the cutter actuating means 8. This driving means 16 is
As shown in FIG.
9, and the rotation of the first transmission shaft 20 is transmitted to the rotation support base 1 via a timing pulley 21 and a timing heald 22 provided on the first transmission shaft 20. On the other hand, this first transmission shaft 20 is connected to a bevel gear 23.
The output shaft 27 of the differential gear 25 is interlocked with the second transmission shaft 30 via bevel gears 28 and 29. The rotation of the second transmission shaft 30 is transmitted to the rotary table 2 via a timing pulley 31 and a timing heald 32 provided thereon (the rotary table 2 itself is used as a timing pulley). Yes.The above differential gear device 2
5 includes a gear box 33 rotatably supported on the input shaft 26 and the output shaft 27, a bevel gear 34 fixed to the input shaft 26, and a bevel gear 3 fixed to the output shaft 27.
5, bevel gears 36 and 37 are rotatably supported by support shafts 36a and 37a fixed to the gear box 33, respectively, and a bevel gear 38 is coaxially provided at one end of the gear box 33. and a bevel gear 40 that meshes with the servo motor 39 and is driven by a servo motor 39. According to this differential gear device 25, in normal times, that is, when not cutting, the servo motor 39 is stopped and the gear box 33 is braked by the bevel gear 40. Therefore, in this state, the drive main shaft 17 is rotated. is transmitted to the first transmission shaft 20 and the second transmission shaft 30 at the same rotational speed, so that the rotary support base l and the rotary base 2 rotate synchronously through the respective timing belts 22 and 32. Then, when cutting the paper tube P, the servo motor 39 is operated and the bevel gear 40 is cut.
When driven to rotate, the gear box 33 rotates around the input shaft 26 and the output shaft 27, and accordingly, the bevel gears 36.
37 revolves, thereby the input side shaft 26 and the output side shaft 2
7 (for example, the output shaft 27) is sped up and the other side (input shaft 26) is decelerated, and the rotary support table l and the rotary table 2, which were previously rotating synchronously, A difference in the rotational speed occurs between them, that is, the rotational speed of the rotary support table 1 becomes smaller and the rotational speed of the rotating table 2 becomes larger. In this case, the rotary support base 1 and the rotary base 2 are assumed to rotate in the counterclockwise direction with respect to FIGS. A phase difference of 120° is provided between the table 1 and the rotary table 2.

Therefore, when the servo motor 39, which is normally inactive, is activated to rotate the bevel gear 40 during the synchronous rotation of the rotary support base 1 and the rotary base 2, the rotary base 2 rotates 120 degrees with respect to the rotary support base 1. ° rotation movement, thereby causing each cam driven roller 13 of the cutter actuating means 8 to roll along each groove portion 14a from the trough portion to the crest portion thereof, and thereby each disk-shaped cutter 6 is moved via each swinging arm 7. , reciprocating between the non-cutting position and the cutting position.

The movable table 15 is configured to move at the same speed as the traveling speed of the paper tube P while being slid and guided by a guide shaft 42 by a ball screw 41 driven by, for example, a servo motor. Also, inside the paper tube P, there is a core metal 4 that supports the paper tube P from the inner peripheral surface side at a desired cutting location.
3 is a movable insert.

Next, to briefly explain the cutting operation of cutting the paper tube P using the above-mentioned cutting device, the support tube 3 is externally fitted coaxially onto the paper tube P that is wound and sent out while rotating from the paper tube manufacturing machine. In this state, the moving table 15 is made to follow this paper tube P. At this time, the rotary support table 1 and the rotary table 2 are rotated synchronously by the operation of the driving means 16. When the paper tube P moves a predetermined amount and the moving base 15 moves at the same speed as the paper tube P, the servo motor 39 drives the bevel gear 40 to rotate the differential gear. 25 to provide a phase difference between the rotary support table 1 and the rotary table 2, thereby actuating the cutter actuating means 8 to move the three disc-shaped cutters 6 revolving at high speed to the second position. The cutting operation is instantaneously performed by cutting while approaching the paper tube P from the non-cutting position shown by the two-dot chain line in the figure, and returning to the non-cutting position of the halo after reaching the complete cutting position shown by the solid line in the figure. let In this case, the direction of revolution of each disc-shaped cutter 6 is opposite to the direction of rotation of the paper tube P. When the cutting is completed in this way, the movable table 15 is retreated to its original position, enters the next cutting position, and performs the above-mentioned operation again.

In the illustrated embodiment described above, three disc-shaped cutters are used, but two or more disc-shaped cutters can also be used. Moreover, although each disk-shaped cutter is made to revolve in a state in which it can rotate, it may be made to revolve in a state in which it cannot rotate itself. Furthermore, the blade portion of each disk-shaped cutter is not limited to the so-called knife-like one shown in the embodiment, but can also be serrated, and in this case, the cutter itself is driven to rotate. You may also do so.

Furthermore, in the illustrated embodiment, a so-called cam mechanism is employed as the cutter operating means, and the drive of this cam mechanism and the drive of the rotary support base that supports each disc-shaped cutter are
Although the cutting is performed by the drive means 16 including a differential gear device, according to the cutting device of the present invention, a screw mechanism or the like that reciprocates each disk-shaped cutter by so-called screw action can be used as the cutter actuating means. According to the device of the present invention, the cutter actuating means and the rotary support base may be driven by separate driving means.

Further, in the embodiments, only the tube material that moves while rotating has been described, but the present invention can also be applied to cutting a tube material that remains fixed in a fixed position.

(Effects of the Invention) According to the present invention, a plurality of disc-shaped cutters arranged at equal intervals in the circumferential direction and equidistant from the central axis of the pipe material rotate and move toward the center of the pipe material to cut the pipe material. Therefore, it is possible to cut even a considerably thick pipe material in a very short time, and even when cutting a rotating and moving pipe material such as a paper tube, it is possible to cut it in a very short time regardless of the rotational action of the pipe material. Since cutting can be done in a short time, the travel stroke of the cutter can be significantly shortened. In addition, since the cutter stroke per second can be shortened in this way, when cutting thick-walled paper tubes, it is no longer necessary to make rough cuts as in the past, and the paper tube that comes out of the paper tube manufacturing machine can be cut directly. It can be cut to a desired length, which shortens cutting time, and there is no uncut portion, allowing almost 100% effective use of the paper tube.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional plan view of a cutting device showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view taken along the line ■-■ in FIG. 1, and FIG. FIG. 2 is an exploded perspective view showing the arrangement of a rotary table, a disc-shaped cutter, a cutter operating means, a paper tube, a support tube, and the like. ■... Rotating support base, 2... Rotating base, P... Paper tube,
6... Disc-shaped cutter, 7... Swinging arm, 8...
・Cutter operating means, 10...Cutter support shaft, 11.
...Interlocking pin, 12...Elongated hole, 13...Interlocking pin,
14... Cam groove, 14a... Groove portion, 15... Moving table, 16... Driving means, 25... Differential gear mechanism.

Claims (1)

[Claims] 1. A plurality of disc-shaped cutters are arranged around the pipe material to be cut at equal distances in the radial direction from the central axis of the pipe material and at equal intervals from each other in the circumferential direction; A method for cutting a pipe material, comprising: rotating the disc-shaped cutter around the central axis of the pipe material, and cutting the pipe material while moving each disc-shaped cutter from a predetermined position toward the center of the pipe material. 2. A rotary support whose rotation center is coaxial with the central axis of the pipe material to be cut, and a rotary support at positions equidistant from the rotation center of the rotary support in the radial direction and equidistant from each other in the circumferential direction. a plurality of disc-shaped cutters supported by;
cutter actuating means for reciprocating these disc-shaped cutters between a non-cutting position and a tube cutting position spaced from the non-cutting position toward the center of the rotary support; and a cutter actuation means for rotationally driving the rotary support and actuating the cutter. A pipe material cutting device comprising: a drive means for controlling the drive of the means. 3. A rotary support having a rotation center coaxial with the central axis of the pipe material to be cut, a driving means for rotationally driving this rotation support, and a rotary support having an equal distance in the radial direction from the rotation center of the rotation support; A plurality of disc-shaped cutters are supported by the rotary support base at positions equidistant from each other in the circumferential direction, and these disc-shaped cutters are moved to a non-cutting position and from the non-cutting position to the center of the rotary support base. A tube material cutting device comprising: a cutter actuating means for reciprocating between separated tube material cutting positions; and a driving means for driving the cutter actuating means.