JP6625335B2 - Bias cut device - Google Patents

Description

  The present invention relates to a bias cut device that cuts both ends of a belt into biases.

  In general, a V-belt, which is a power transmission belt, is manufactured by cutting both ends of a belt having a rectangular cross section, which is formed into a belt sleeve and vulcanized, into a trapezoidal cross section (cut into bias). If the bias cut surfaces (inclination angles) at both ends of the V-belt thus manufactured vary, the V-belt may vibrate and vary in tension when traveling between the pulleys, which may cause vibration of the machine. is there.

  In order to solve such a problem and secure a target dimension according to the product standard, Patent Document 1 discloses a method in which a cutter head having two fixed blades arranged in parallel is bridged between pulleys. One of the fixed blades fixed to the cutter head is moved to one side of the opposing inner peripheral surface of the belt to bias-cut one end of the belt. There is disclosed a bias cut device that moves the other fixed blade fixed to the other side to the other side of the inner peripheral surface of the opposed belt to bias-cut the other end of the belt. According to this, the bias cut surfaces (tilt angles) at both ends of the V-belt can be cut with high accuracy only by moving the cutter head having two fixed blades arranged in parallel in parallel.

JP 2006-205335 A

  However, the bias cut device described in Patent Literature 1 requires a high rigidity such as a low-edge V-belt (speed-change belt) used in a belt-type continuously variable transmission because the blade is fixed to the cutter head. When a belt (a belt using a rubber composition having high rigidity (for example, a rubber composition containing PBO short fibers) or a cord (for example, an aramid cord)) is cut with this apparatus, a blade (in particular, a belt and (The contact part) is severely worn, and the life of the blade may be relatively short.

  Further, in the bias cut device described in Patent Literature 1, since two blades are fixed to the cutter head, for example, the inner circumferential space of the belt when it is stretched between pulleys is reduced, and the circumferential length is reduced. For a short belt, there is a case where a space for disposing a cutter head having two blades cannot be secured, and bias cutting cannot be performed.

  Further, in the bias cut device described in Patent Literature 1, fine adjustment (position and angle correction) of the blade when replacing the blade or changing the position of the blade is troublesome. There is also a request.

  Therefore, an object of the present invention is to provide a bias cut device capable of reducing wear on the blade, making the blade compact, and simplifying fine adjustment (position and angle correction) of the blade.

The present invention is a bias cut device for cutting a belt having a rectangular cross section into a bias,
At least two shafts that can be extended in the belt circumferential direction while applying tension to the belt having the rectangular cross section;
An axis driving unit capable of driving at least one of the two axes;
A push roll that presses at least one of the tension side and the slack side of the belt,
A cutter head having one round blade disposed in the inner peripheral space of the belt stretched between the shafts,
A direction in which the round blade of the cutter head is directed toward the inner peripheral surface on one side of the opposing inner peripheral surface of the belt, and is inserted along the bias cut surface on one end side in the width direction of the belt. And the direction to move in the width direction of the belt, the direction toward the opposite inner circumferential surface of the belt inner circumferential surface in the other direction, and the bias cut surface on the other end side in the width direction of the belt. A moving mechanism that allows the robot to move along
It is characterized by having.

According to the above configuration, in a state where the belt is rotating between the shafts, one round blade provided on the cutter head is placed between the shafts on one side of the inner circumferential surface of the belt facing the shaft. By moving, the round blade can enter along the bias cut surface on one end side in the width direction of the belt. Further, after one round blade provided on the cutter head moves in the width direction of the belt, it is stretched across the shaft and moves to the opposite side of the one side of the inner peripheral surface of the belt facing the belt. Thereby, the round blade can be advanced along the bias cut surface on the other end side opposite to the one end side in the width direction of the belt. That is, it is possible to cut the side surfaces at both ends of the belt along the bias cut surface only by moving one round blade provided in the cutter head, and it is not necessary to provide a plurality of round blades. Cost reduction can be realized.
In addition, since the cutter head has only one round blade, the cutter head itself can be made more compact than a configuration in which the cutter head has multiple blades. It becomes possible to easily cut even a belt having a narrow circumferential space and a short circumferential length.

Further, the present invention provides the bias cut device, wherein the round blade is provided rotatably with respect to the cutter head,
Further, a round blade drive unit for rotating the round blade is provided.

  According to the above configuration, when cutting both ends of the belt that moves between the shafts, the cutting can be performed while rotating the round blade. According to this, compared to a configuration in which the round blade is fixed to the cutter head, wear of the round blade can be suppressed, and the life of the round blade can be improved.

Further, the present invention provides the bias cut device, wherein the bias cut device has an arc-shaped rail,
The cutter head is movable along the arc-shaped rail.

  According to the above configuration, by moving the cutter head along the arc-shaped rail, the inclination angle at which the round blade provided on the cutter head enters both ends of the belt can be changed. Thereby, the inclination angle of the bias cut surface of the belt can be freely adjusted.

Further, the present invention provides the bias cut device, wherein a rail drive unit and an input unit that allow the cutter head to move along the arc-shaped rail.
And a control unit,
The control unit controls the rail driving unit to move the cutter head along the arc-shaped rail so as to match an inclination angle of the bias cut surface input from the input unit. And

  According to the above configuration, the control unit automatically adjusts the round blade provided on the cutter head so as to match the inclination angle of the bias cut surface input from the input unit. This facilitates adjustment and correction of the inclination angle of the bias cut surface when cutting both ends of the belt, and further saves the trouble of adjusting the angle of the round blade every time the round blade is replaced or the position of the round blade is changed. The dimensional accuracy is improved.

  Further, the present invention is characterized in that the bias cut device further includes a guide roll provided on a side surface of the belt opposite to a side on which the round blade enters.

  According to the above configuration, when the inclined round blade enters the end of the belt and cuts the end of the belt, the belt shifts to the side opposite to the side where the round blade enters and escapes. Guide rolls can be stopped.

  It is possible to provide a bias cut device capable of reducing wear on the blade, making the blade compact, and simplifying fine adjustment (position and angle correction) of the blade.

FIG. 2 is a perspective view showing the overall configuration of the bias cut device according to the embodiment. FIG. 4 is an enlarged plan cross-sectional view showing a state of bias cutting by moving a cutter head. FIG. 2 is a perspective view of a cutter head and a support structure thereof. FIG. 4 is a cross-sectional perspective view of a V-belt manufactured by a bias cut device. Explanatory drawing of the fixed blade and the rotary blade used in the verification experiment.

(V belt 1)
First, the configuration of the V-belt 1 manufactured by the bias cut device of the present embodiment will be described with reference to FIG. In this V-belt 1, a cord 3 made of a fiber cord is embedded in an adhesive rubber layer 2, and an extension rubber layer 5 including a reinforcing cloth 4 is provided on an upper part of the adhesive rubber layer 2, and a reinforcing cloth is similarly provided on a lower part. The compressed rubber layer 6 including the rubber layer 4 is disposed. The compressed rubber layer 6 is provided with cog portions 9 in which cog valley portions 7 and cog ridge portions 8 are alternately arranged along the belt circumferential direction at a constant pitch.

  The shape of the belt side surface 10 has a right-angle cut surface 13 perpendicular to the back surface 12 of the stretched rubber layer 5 and a bias cut surface 15 formed by a bias cut device 20 described later. Specifically, assuming that the distance from the back surface 12 of the stretch rubber layer 5 to the upper end P of the core wire 3 is L, the distance from the back surface 12 of the stretch rubber layer 5 to the boundary position U corresponding to 90 to 100% of L The area is the right angle cut surface 13. On the other hand, a region from the boundary position U to the bottom surface 14 of the compressed rubber layer 6 is a bias cut surface 15.

  Polyester fiber, aramid fiber, and glass fiber are used as the core wire 3, and among them, the total denier number of the polyester fiber filament group having ethylene-2,6-naphthalate as a main constituent unit is 4,000 to 8 A 2,000 bonded cord is preferred to reduce the belt slip rate and extend belt life. In the present embodiment, the number of twists in the cord is 10 to 23/10 cm, and the number of twists in the cord is 17 to 38/10 cm. When the total denier number is less than 4,000, the modulus and strength of the core wire become low, and when it exceeds 8,000, the belt becomes thick and the bending fatigue property is not good.

  Examples of the rubber used for the compression rubber layer 6 and the extension rubber layer 5 include natural rubber, butyl rubber, styrene-butadiene rubber, chloroprene rubber, ethylene-propylene rubber, alkylated chlorosulfanated polyethylene, hydrogenated nitrile rubber, and hydrogenated rubber. A rubber material alone such as a mixed polymer of a nitrile rubber and a metal salt of an unsaturated carboxylic acid, or a mixture thereof is used.

  The short fibers 16 used for the compressed rubber layer 6 are made of fibers such as aramid fibers, polyamide fibers, polyester fibers, and cotton. The length of the fibers varies depending on the type of the fibers, but is about 1 to 10 mm. For example, aramid fibers of about 3 to 5 mm and polyamide fibers, polyester fibers and cotton of about 5 to 10 mm are used. When the direction of the short fibers 16 in the compressed rubber layer 6 is 90 ° in the direction perpendicular to the circumferential direction of the belt, most of the short fibers are in the range of 70 to 110 °. Preferably, they are oriented within.

  The stretched rubber layer 5 may not include the short fibers 16. The adhesive rubber layer 2 may include the short fibers, but preferably does not include the short fibers.

  The reinforcing cloth 4 is made of cotton, polyester fiber, nylon, or the like, and is a cloth woven in plain weave, twill weave, satin weave, or the like. After the reinforcement cloth 4 is subjected to the RFL treatment, the rubber composition is subjected to fiction coating to obtain a canvas with rubber. The RFL solution is obtained by mixing a latex with an initial condensate of resorcinol and formaldehyde, and the latex used herein includes chloroprene, styrene / butadiene / vinylpyridine terpolymer, hydrogenated nitrile, NBR and the like.

(Bias cut device 20)
Next, the configuration of the bias cut device 20 for manufacturing the V-belt 1 will be described with reference to FIGS.

  As shown in FIG. 1, the bias cut device 20 includes a drive shaft 21 and a driven shaft 22 which are parallel to each other, and on which a belt 40 having a rectangular cross section can be stretched. The two shafts 21 and 22 project from the front surface of the main body 23 toward the near side. In addition, at least one of the two shafts 21 and 22 is movable in a direction approaching or away from the other shaft so that belts 40 having various circumferential lengths can be stretched. Has become. In the present embodiment, the driven shaft 22 is movable in the vertical direction.

  The drive shaft 21 is connected to a prime mover (shaft drive unit) such as a motor built in the main body 23, and rotates by receiving a driving force from the prime mover so that the belt 40 can run. ing.

  The belt 40 having a rectangular cross section is manufactured by cutting a belt sleeve in which these are laminated and integrated so that the core wire 3 is interposed between the compression rubber layer 6 and the extension rubber layer 5 at a right angle to a predetermined width. Is done. Although the cog portion 9 of the belt 40 is not shown in FIG. 1, the belt 40 is set in the bias cut device 20 with the cog portion 9 directed to the inner peripheral side.

  Each of the driving shaft 21 and the driven shaft 22 has a ring-shaped accommodation groove 24, and the belt 40 can be accommodated in the accommodation groove 24. The width of the housing groove 24 is configured to be changeable by a cylinder (not shown) (a means for changing the width of the housing groove), so that the belt 40 can be stretched over both shafts 21 and 22 while the side surface of the belt 40 is sandwiched. Has become possible.

  In addition, as shown in FIGS. 1 and 2, the bias cut device 20 includes a first support portion 41 and a second support portion 42 that are arranged to face each other. Each of the support portions 41 and 42 is provided with a push roll 43 provided rotatably while contacting the back surface of the belt 40 on the tension side and the slack side of the belt 40, and rotatable while sandwiching both side surfaces of the belt 40. A guide roll 44 provided, and a guide roll 45 provided rotatably and provided on a side surface of the belt 40 opposite to a side on which a round blade provided on a cutter head 50 described later enters. ing. The guide roll 45 plays a role of preventing the belt 40 from shifting to the side opposite to the side surface of the belt 40 to be cut and running away when the side surface of the belt 40 is cut.

  Between the drive shaft 21 and the driven shaft 22 and between the two support portions 41 and 42 (the inner circumferential space of the belt 40), the side surface of the belt 40 is biased (oblique). The cutter head 50 is arranged. The cutter head 50 has one round blade 51. The round blade 51 is a circular blade having a blade portion formed around the entire circumference thereof, and is rotatably attached to the cutter head 50. The cutter head 50 is attached to the tip of one arm 53 that extends so as to be inserted into the inner circumferential space of the belt 40. The round blade 51 is rotatable by receiving a driving force from a prime mover (round blade driving unit) such as a motor built in the moving mechanism 60. The rotation direction of the round blade 51 is set to be the same as the traveling direction of the belt 40.

  The main body 23 of the bias cut device 20 includes a moving mechanism 60 for moving the cutter head 50. The moving mechanism 60 includes a first table 61, a fan-shaped second table 63 movably provided on the first table 61, and a third table 62 provided on the second table 63. And a movable body 64 movable on the third table 62. The connecting member 54 is fixed to the moving body 64, and the base end of the arm 53 is fixed to the distal end of the connecting member 54.

  More specifically, two rails are provided on the upper surface side of the first table 61 so as to be parallel to the width direction of the belt 40 stretched between the shafts 21 and 22. Further, on the lower surface side of the second table 63, two guide rails which are engaged with and slide on two rails provided on the upper surface side of the first table 61 are provided. The second table 63 is provided with a servo motor (not shown). By driving the servo motor, two guide rails provided on the lower surface of the second table 63 are provided on the upper surface of the first table 61. It is slidable on the two rails. That is, the second table 63 is movable with respect to the first table 61 in the width direction of the belt 40. Thus, the cutter head 50 can be freely moved in the width direction of the belt 40.

  Further, on the upper surface side of the second table 63, two rails arranged so as to be curved in an arc shape along the second table 63 having a fan shape are provided. On the lower surface side of the third table 62, two arcuate guide rails are provided which engage with and slide on two arcuate rails provided on the upper surface side of the second table 63. The third table 62 is provided with a servo motor (rail driving unit) (not shown). By driving the servo motor, two arc-shaped guide rails provided on the lower surface side of the third table 62 are moved to the third table 62. The two tables 63 are slidable on two arc-shaped rails provided on the upper surface side. That is, the third table 62 is movable in the arc direction with respect to the second table 63. Thereby, the angle of entry of the round blade 51 into the belt 40 can be adjusted.

  On the upper surface side of the third table 62, two rails arranged so as to be parallel to the thickness direction of the belt 40 stretched between the shafts 21 and 22 are provided. Further, on the lower surface side of the moving body 64, two guide rails which are engaged with and slide on two rails provided on the upper surface side of the third table 62 are provided. The moving body 64 is provided with a servo motor (not shown). By driving the servo motor, two guide rails provided on the lower surface side of the moving body 64 are provided on the upper surface side of the third table 62. It is slidable on two rails. That is, the moving body 64 is movable with respect to the third table 62 in the thickness direction of the belt 40. Thereby, the cutter head 50 can be freely moved in the thickness direction of the belt 40.

  The bias cut device 20 according to the present embodiment includes a computer (control unit), an input unit (operation buttons, a keyboard, a touch panel, etc.) and a storage device. Drive control can be performed by inputting information from. Thereby, in the bias cut device 20, the movement control of the cutter head 50 in the thickness direction of the belt 40, the movement control of the cutter head 50 in the width direction of the belt 40, and the movement of the round blade 51 of the cutter head 50 to the belt 40 are performed. Automatic adjustment of the approach angle is possible.

(Method of manufacturing V-belt 1)
Next, a method of manufacturing the V-shaped V belt 1 using the bias cut device 20 will be described.

  First, the belt 40 having a rectangular cross section is hung around the accommodation groove 24 of both shafts 21 and 22. Thereafter, when a cylinder (not shown) is driven, the belt 40 can be stretched around the two shafts 21 and 22 with the side surface of the belt 40 sandwiched between the side surfaces of the housing groove 24. Further, by adjusting the movement of the driven shaft 22 in the vertical direction, it is possible to set the tension (tension) in accordance with the circumference of the belt 40. In the support portions 41 and 42, both sides of the belt 40 are sandwiched by guide rolls 44 and the back surface is pressed by push rolls 43. Thus, the setting of the belt 40 on the bias cut device 20 is completed (see FIG. 1).

  Next, the inclination angle of the bias cut surface 15 formed at both ends of the belt 40 is input by the input unit. In addition, information about the belt 40 such as the width, thickness, and circumference of the belt 40 is input from the input unit. The input information of the belt 40 is stored in the storage device.

  Thereafter, in response to a start command from the input unit, the bias cut device 20 uses the computer based on the information of the belt 40 (the inclination angle of the bias cut surface 15, the width / thickness / perimeter of the belt 40, etc.) stored in the storage device. Is program controlled by

  The following steps are executed as specific program control. First, the drive shaft 21 is rotationally driven by the prime mover, and the belt 40 travels while applying tension thereto. Then, the moving mechanism 60 is driven to cut the one side surface of the belt 40 obliquely with the round blade 51 of the cutter head 50, and subsequently, the oblique cut of the other side surface of the belt 40 with the round blade 51. .

  Specifically, as shown in FIG. 2, before moving to the inner circumferential space of the belt 40 spanned between the shaft 21 and the shaft 22, the round blade 51 of the cutter head 50 is biased by the bias of the belt 40. It is adjusted by tilting so as to match the tilt angle of the cut surface 15. This operation is performed by moving the third table 62 in the arc direction with respect to the second table 63 by controlling the servomotor under computer program control based on the inclination angle of the bias cut surface 15 stored in the storage device. Is

  Next, as shown in FIG. 2, the cutter head 50 is moved in the direction of the arrow A (to the inner circumferential space of the belt 40 stretched between the shafts 21 and 22), and the cutter head 50 is moved. Is disposed on an extension of the inclination angle of the bias cut surface 15 set at one end in the width direction of the belt 40 on the tension side (position 1). This operation is performed by moving the second table 63 in the width direction of the belt 40 by controlling the servomotor under computer program control.

  Next, as shown in FIG. 2, the circular blade 51 of the cutter head 50 is moved in the direction of arrow B while being rotationally driven (the inner circumference of the inner circumferential surface of the facing belt 40 on one side (tension side)). (The direction in which the belt 40 enters along the bias cut surface 15 at one end in the width direction of the belt 40), and the side surface at one end of the belt 40 is cut obliquely (the input inclination angle). The bias cut surface 15 is formed on one end side of 40. This operation is performed by controlling the servomotor under computer program control to move the moving body 64 in the thickness direction of the belt 40. In the support portion 42, the belt 40 is pressed by the push roll 43 and the other end of the belt 40 is restrained by the guide roll 45, so that the belt 40 is prevented from escaping when entering the round blade 51. .

  Next, the round blade 51 of the cutter head 50 is returned to the position 1 described above. After that, the cutter blade 50 is moved in the direction of arrow C (movement in the width direction of the belt 40), and the round blade 51 of the cutter head 50 is moved to the bias cut surface 15 set on the other end in the width direction of the slack side belt 40. It is arranged on the extension of the inclination angle (position 2). This operation is performed by moving the second table 63 in the width direction of the belt 40 by controlling the servomotor under computer program control.

  Next, as shown in FIG. 2, the round blade 51 of the cutter head 50 is moved in the direction of arrow D (the direction toward the inner circumferential surface on the other direction side (slack side) of the inner circumferential surface of the facing belt 40). In the direction in which the belt 40 enters along the bias cut surface 15 at the other end in the width direction of the belt 40), the side surface at the other end of the belt 40 is cut obliquely (input inclination angle), and A bias cut surface 15 is also formed on the other end side. This operation is performed by controlling the servomotor under computer program control to move the moving body 64 in the thickness direction of the belt 40. In the support portion 41, the belt 40 is pressed by the push roll 43, and one end of the belt 40 is stopped by the guide roll 45, so that the belt 40 is prevented from escaping when the round blade 51 enters.

  As a result of the above operation being performed by the automatic control, the side surfaces at both ends of the belt 40 are cut obliquely, and the bias cut surfaces 15 can be formed on both side surfaces of the belt 40 as shown in FIG. Thus, the V belt 1 having a V-shaped cross section is completed.

According to the bias cut device 20, in the state where the belt 40 is rotating between the shaft 21 and the shaft 22, one round blade 51 provided on the cutter head 50 is connected to the shaft 21 and the shaft 22. The round blade 51 moves along the bias cut surface 15 at one end in the width direction of the belt 40 by moving in one direction side (stretching side) of the inner peripheral surface of the belt 40 facing the belt 40. Can be done. Further, after one round blade 51 provided on the cutter head 50 moves in the width direction of the belt 40, it is stretched between the shafts 21 and 22 and one direction of the inner peripheral surface of the belt 40 facing the same. By moving to the opposite side (slack side) to the side (tension side), the round blade 51 enters along the bias cut surface 15 on the other end side opposite to the one end side in the width direction of the belt 40. be able to. That is, it is possible to cut the side surfaces at both ends of the belt 40 along the bias cut surface 15 only by moving one round blade 51 provided in the cutter head 50, and it is not necessary to provide a plurality of round blades 51, and the configuration of the apparatus is simplified. Thus, compactness and low cost can be realized.
Further, since the cutter head 50 has only one round blade 51, the cutter head 50 itself can be made more compact than a configuration in which the cutter head 50 has a plurality of blades. The inner circumferential space of the belt 40 when it is stretched between the belts becomes narrower, and the belt 40 can be easily cut even with a short circumferential length.

  Further, when cutting both ends of the belt 40 that moves between the shaft 21 and the shaft 22, the cutting can be performed while rotating the round blade 51. According to this, as compared with a configuration in which the round blade 51 is fixed to the cutter head 50, the wear of the round blade 51 can be suppressed, and the life of the round blade 51 can be improved.

  Further, by moving the cutter head 50 along an arc-shaped rail arranged on the second table 63, it is possible to change the inclination angle at which the round blade 51 provided on the cutter head 50 enters both ends of the belt 40. it can. Thereby, the inclination angle of the bias cut surface 15 of the belt 40 can be freely adjusted.

  In addition, the computer automatically adjusts the round blade 51 provided on the cutter head 50 so as to match the inclination angle of the bias cut surface 15 input from the input unit. This facilitates the adjustment and correction of the inclination angle of the bias cut surface 15 when cutting both ends of the belt 40, and furthermore, the angle adjustment of the round blade 51 every time the round blade 51 is replaced or the position of the round blade 51 is changed. And the dimensional accuracy is improved.

  In addition, when the inclined round blade 51 enters the end of the belt 40 and cuts the end of the belt 40 obliquely, the belt 40 shifts to the side opposite to the side where the round blade 51 enters and escapes. This can be prevented by the guide roll 45.

(Verification experiment)
Verification experiments were conducted to determine how much wear of the round blade 51 was suppressed when the round blade 51 was fixed to the cutter head 50 and when the round blade 51 was rotated by the cutter head 50.

  Specifically, as shown in FIG. 5, a case where the round blade 51 is fixed to the cutter head 50 of the bias cutting device 20 (fixed blade), and a case where the round blade 51 is driven to rotate in the cutter head 50 ( And the number of uses until the end of the belt 40 could not be cut.

  As the verification conditions, the tension of the belt 40 stretched over the shaft 21 and the shaft 22 was set to 1000 N, the circumferential speed of the belt 40 stretched over the shaft 21 and the shaft 22 was set to 3.6 m / s, The rotation speed was 4.0 m / s (the peripheral movement speed of the belt 40: the rotation speed of the round blade 51 = 1: 1.1), and the rotation direction of the round blade 51 was the same as the running direction of the belt 40. The round blades 51 have the same specifications. In addition, when the round blade 51 was fixed (fixed blade), as shown in FIG. 5, the number of times of use was counted as being rotated every 90 ° and used four times.

  As a result, when the round blade 51 was fixed (fixed blade), the belt 40 could be cut 150 times by using the round blade 51 for 90 °. Therefore, since one fixed blade can be used four times, 150 × 4 = 600 times were counted as the number of times of use. On the other hand, when the round blade 51 was driven to rotate (rotary blade), the belt 40 could be cut 1500 times.

  Therefore, according to the verification experiment, when the belt 40 is cut by rotating the round blade 51, the wear of the round blade 51 is suppressed as compared with the case where the belt 40 is cut by fixing the round blade 51, It was found that the life of the round blade 51 could be extended 2.5 times.

(Other embodiments)
The preferred embodiment of the present invention has been described above, but the above embodiment can be further modified as follows.

  In the above-described embodiment, the bias cut device 20 is configured to include the two shafts of the drive shaft 21 and the driven shaft 22. However, the configuration is not limited thereto. For example, three or more may be arranged.

  Further, the configuration of the support portions 41 and 42 is not limited to the configuration of the above embodiment. For example, the number and arrangement of the push rolls 43 and the guide rolls 44 may be changed.

  Further, the configuration of the moving mechanism 60 of the cutter head 50 may be a dial-driven rotary table that enables the third table 62 to rotate with respect to the second table 63.

Reference Signs List 1 V belt 3 core wire 5 stretch rubber layer 6 compression rubber layer 20 bias cut device 21 drive shaft 22 driven shaft 40 belt with rectangular cross section 43 push roll 44 guide roll 45 guide roll 50 cutter head 51 round blade 60 moving mechanism

Claims (5)

A bias cut device that cuts a belt having a rectangular cross section into a bias,
At least two shafts that can be extended in the belt circumferential direction while applying tension to the belt having the rectangular cross section;
An axis driving unit capable of driving at least one of the two axes;
A push roll that presses at least one of the tension side and the slack side of the belt,
A cutter head having one round blade disposed in the inner peripheral space of the belt stretched between the shafts,
A round blade drive unit configured to rotate the round blade with respect to the cutter head;
A direction in which the round blade of the cutter head is moved toward the inner circumferential surface on one side of the opposed inner circumferential surface of the belt, and enters along the bias cut surface on one end side in the width direction of the belt. One direction, a second direction to move in the width direction of the belt, and a direction toward the opposite inner circumferential surface of the belt inner circumferential surface in the other direction, and the other end in the width direction of the belt. A moving mechanism that is freely movable in a third direction that enters along the bias cut surface;
And a control unit,
When the belt stretched over the two shafts is driven by the shaft drive unit to run, the belt is rotated by the round blade drive unit. The rotation direction of the round blade is the running direction of the belt. It is set to be in the same direction as
The control unit moves the round blade in the first direction, cuts one end of the belt in the width direction along the bias cut surface, and then moves the round blade in the second direction. Then, after moving the round blade from one end side in the width direction of the belt to the other end side, the round blade is moved in the third direction to cut the other end side in the width direction of the belt with the bias cut. A bias cut device, wherein the moving mechanism is controlled so as to cut along a surface. It has an arc-shaped rail,
The bias cutter according to claim 1, wherein the cutter head is movable along the arc-shaped rail. A rail drive unit and an input unit that allow the cutter head to move along the arc-shaped rail,
The control unit controls the rail drive unit so as to match the inclination angle of the bias cut surface input from the input unit, and controls the cutter head to move along the arc-shaped rail. The bias cut device according to claim 2 , wherein the bias cut is performed. The bias cut device according to any one of claims 1 to 3 , further comprising a guide roll provided on a side surface of the belt opposite to a side on which the round blade enters.   The bias cut device according to any one of claims 1 to 4, wherein a ratio between a running speed of the belt and a rotation speed of the round blade is 1: 1.1.

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