JP3326408B2 - Belt width cutting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt width cutting device for cutting a wide belt formed body into a belt having a predetermined width by using a blade.

[0002]

2. Description of the Related Art Conventionally, as a belt width cutting device, for example, as shown in a schematic configuration in FIG. 16, a wide belt molded product after vulcanization is disposed between a main spindle roll 101 and a tension roll 102 arranged vertically. The belt 10 having a predetermined width is intermittently moved at a predetermined pitch while the belt forming body 103 is rotated.
One that cuts into five is known.

In such an apparatus, the cutting tool 104 is moved along the axial direction of the main spindle roll 101 to sequentially cut the belt 105 having a predetermined width. And the remaining belt compact 103 are mixed.

[0004]

However, if the cut belt 105 and the remaining belt compact 103 are mixed during the cutting operation, the belt tension changes between the first time and the last time of the cutting operation. do it,
When a belt with a narrow cut width (for example, a cut width: 4.0 mm or less) is cut, the cut width accuracy is reduced due to the influence, and defective products are generated. In addition, when the belt formed body is thin (for example, the belt thickness is 2.0 mm or less) and has low rigidity, so-called two-step breaking, which cannot be cut by one cutting operation, is likely to occur.

[0005] The present invention has been made in view of the above point, and it is an object of the present invention to provide a belt width cutting device capable of cutting with high accuracy regardless of the belt thickness and the cutting width.

[0006]

A belt width cutting device according to the present invention comprises:
A wide belt molded body is wound around with a predetermined belt tension, while rotating the wide belt molded body,
A cutting tool for sequentially cutting into a belt of a predetermined width by a cutting tool, wherein the cutting tool is moved between a cutting position for cutting a belt of a predetermined width from the belt formed body and a retracted position away from the cutting position. Position switching means, receiving a signal from the blade position switching means, after the belt of a predetermined width is cut, the main shaft roll is moved by a predetermined amount in the axial direction with respect to the tension roll, the cut of the predetermined width A roll moving means for removing the belt from the tension roll is provided. Here, “cut to a predetermined width” is not limited to the case where the widths of the belts to be cut are all the same, but includes the case where the widths are different, that is, the case where a plurality of types of belts having different widths are cut. Further, "moving the main spindle roll by a predetermined amount with respect to the tension roll in the axial direction" means a movement capable of removing the cut belt of a predetermined width from the tension roll, and the main spindle roll or the tension roll. This includes not only the case where only one of the rolls is moved, but also the case where both of the rolls are moved together. Further, "after the belt of the predetermined width is cut" means after the blade has cut the belt of the predetermined width at the cutting position, and is determined by the start of movement from the cutting position to the retreat position.

According to such an apparatus, first, the belt formed body is wound between the main spindle roll and the tension roll. In a state where the belt formed body is rotated, the blade is moved from the retracted position to the cut position by the blade switching means, a belt of a predetermined width is cut from the wide belt formed body, and after the cut, the blade is moved. Moved to the evacuation position. Each time it is cut, the main shaft roll is moved by a predetermined amount in the axial direction with respect to the tension roll by the roll moving means, and the cut belt is wound around the main shaft roll by the movement of the main shaft roll with respect to the tension roll. The hooked state is maintained and removed from the tension roll. That is, the cut belt is wound around only the main shaft roll. As described above, since the width of the belt is cut without moving the blade in the width direction of the belt molded body, the cut is accurately performed regardless of the thickness and the cut width of the belt. Further, since the cut belt is wound around only the main shaft roll, there is no adverse effect on the cutting operation of the remaining belt formed body.

[0008] The present invention further relates to a belt forming body having a belt formed around the main shaft roll and the tension roll after the cut belt having a predetermined width is removed from the tension roll. And a tension adjusting means for adjusting the belt tension according to the condition.

With this configuration, as the width of the belt molded body becomes shorter, the belt tension is adjusted by the tension adjusting means. For example, the tension per unit width becomes substantially constant throughout the width cutting operation. To be maintained. Therefore, without over tension
The adverse effect of a change in tension due to a change in the width of the belt molded body is avoided.

In this case, the tension roll has an air cylinder and is supported by roll support means capable of adjusting the distance between the tension roll and the main shaft roll by expansion and contraction of the air cylinder. If the amount of air supply to the air cylinder of the roll support means is controlled according to the remaining belt width of the belt molded body, the tension of the remaining belt molded body can be easily adjusted steplessly. be able to.

Further, air is blown from one side of the main roll to the cut end of the main belt roll, and the belt is moved toward the front end of the roll by the rotational force of the main shaft roll. It is desirable to provide an air blowing means for providing

With this configuration, air is blown from the base end of the roll to the cut belt by the air blowing means, and the belt is twisted. As a result, the cut belt is sent to the roll tip side by the rotational force of the spindle roll, and is automatically released from the tip of the spindle roll.

Further, when the belt compact wound around the main spindle roll and the tension roll is rotated, the amount of deflection of the tension roll is adjusted so that the belt compact moves to the roll base end side of the main spindle roll. It is desirable to provide a roll runout amount adjusting means that can be adjusted.

With this configuration, the deflection amount of the tension roll is adjusted by the roll deflection amount adjusting means, and the belt formed body is prevented from being shifted to the roll tip side due to the rotation of the main shaft roll. .

In this case, the belt runout adjusting means includes a bearing housing rotatably supporting the base end of the tension roll, a support housing rotatably supporting the bearing housing, and a support housing. An operating member provided on the support housing for pressing the bearing housing at a contact portion to horizontally turn to one side, and biasing the bearing housing provided on the support housing to a side contacting the contact portion of the operating member. And a biasing member to be provided.

With this configuration, by rotating the operation member by a predetermined amount, the bearing housing and thus the tension roll are horizontally turned by a required amount, and the deflection amount of the tension roll is adjusted. Also, when the operation member is rotated back to its original position,
By the biasing by the biasing member, the bearing housing and thus the tension roll are returned to the original state.

Further, the blade is configured as a circular blade, and is further associated with the blade, and when the belt is moved to a retracted position after cutting a belt of a predetermined width from the belt formed body, the blade is moved. It is desirable to provide a blade rotating means for rotating. In this case, the blade is, for example, 6 to 18
It is desirable to rotate by °.

In this way, the portion to be cut in the belt width by the circular blade is changed sequentially for each cut, so that each portion of the circular blade is used evenly and is effectively used over the entire circular blade. You.

Further, the roll moving means includes a movable base rotatably supporting the main spindle roll, and a belt receiver provided on the movable base and receiving the cut belt of a predetermined width from the main spindle roll. You can do so.

In this way, the cut belt is received by the belt receiver irrespective of the position of the main shaft roll.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 are a front view, a plan view and a side view, respectively, showing a schematic configuration of a belt width cutting device.

As shown in FIGS. 1 to 3, the belt width cutting device 1 includes a main shaft roll 2 having a fixed vertical position.
And the main spindle roll 2 disposed below the main spindle roll 2.
And a tension roll 3 capable of adjusting an interval in the vertical direction with the tension roll 3. The spindle roll 2 and the tension roll 3
As described later, a wide belt formed body 5 that is sequentially cut from the roll tip side of the main shaft roll 2 into a belt 4 having a predetermined width is wound around with a predetermined belt tension (see FIGS. 11 and 12). 12).

The main spindle roll 2 is rotatably supported by a first movable base 11, and the first movable base 11 is
It is provided movably in the axial direction of the main spindle roll 2 above. The first movable base 11 has a rectangular plate-shaped horizontal substrate portion 11a on which a first drive motor 13 for rotating and driving the main shaft roll 2 is mounted, and is provided vertically on one side of the horizontal substrate portion 11a. And a vertical plate portion 11b extending to the right side.

On the upper surface of the base 12, a pair of first guide rails 14 are provided so as to extend in parallel with the axial direction of the main spindle roll 2, while the first movable base 11 is provided.
A slider 15 slidably engaged with the first guide rail 14 is provided in parallel on the lower surface of the horizontal substrate portion 11a. A screw rod 17 extending in parallel with the first guide rails 14 of the base 12 and driven to rotate by a servo motor 16 is provided. A female screw member 18 fixed to the first movable base 11 is screwed to the screw rod 17 so as to be relatively rotatable, and the screw rod 17 is driven to rotate by the servo motor 16 so that the first movable base 11 is rotated. Move along the first guide rail 14, whereby the main spindle roll 2 moves accurately in the axial direction (see FIG. 6).

A second movable base 2 in the form of a rectangular plate for supporting the tension roll 3 is provided immediately before the lead of the base 12.
1 is provided movably in the vertical direction. The second movable base 21 has a protruding portion 21a extending rearward through a vertically long opening 12a on a surface immediately before the lead of the base 12, and the cylinder main body 22a is attached to the protruding portion 21a.
Piston rod 22b of air cylinder 22 fixed to
Are connected to each other.

A slider 24 is provided on the lower surface of the second movable base 21 so as to slidably engage with a second guide rail 23 provided in parallel with the front surface of the base 12 in front of the lead. Thereby, the second movable table 21 is moved in the vertical direction by the expansion and contraction operation of the air cylinder 22. Due to the movement of the second movable base 21, the distance between the main spindle roll 2 and the tension roll 3 is changed,
The belt tension of the wide belt molded body 5 wound around them is adjusted.

By the way, the belt 4 cut to a predetermined width on the main spindle roll 2 is displaced in the axial direction by the main spindle roll 2 so that the belt 4 comes off from the tension roll 3 and the width of the remaining belt molding 5 is reduced. Is gradually shortened, so that the amount of movement of the main shaft roll 2 in the axial direction is converted into a voltage, and an electro-pneumatic proportional valve (electro-pneumatic conversion valve) (not shown) is used. , The pressure of the air cylinder 22 is gradually reduced.
The tension can be adjusted based on the number of rotations of the servo motor 16 corresponding to the width of the belt to be cut without using the movement of the main shaft roll 2 in the axial direction. FIG. 4 shows an example of the relationship between the belt width of the belt formed body 5 and the belt tension (belt tension). Here, when adjusting the belt tension, the relationship between the belt thickness and the belt tension shown in Table 1 below is also considered.

[0029]

[Table 1]

As shown in FIGS. 5 to 7, the tension roll 3 has a base end rotatably supported by a bearing housing 31. The bearing housing 31 has a base end vertically supported by a support housing 32. It is supported so as to be able to turn horizontally around the rotation axis 29. The support housing 32 is provided movably in the axial direction of the tension roll 3 with respect to the second movable table 21. An operation member 33 is provided on the support housing 32 on the tip end side of the bearing housing 31. The operating member 33 has a disc-shaped operating portion 33a provided with a scale, and a contact portion 33b which is connected to the operating portion 33a, penetrates the support housing 32, and has a distal end portion abutting on the bearing housing 31. . The contact portion 33b
Is engraved with a screw on the peripheral surface and is rotatably screwed to the support housing 32.

The operation member 33 has a predetermined angle (a predetermined number of scales engraved on the operation section 33a) according to the type of the belt.
By rotating the tension roll 3 by a predetermined amount in the horizontal plane, the tension roll 3 is swung by a predetermined amount in the horizontal plane, and the axes of the main spindle roll 2 and the tension roll 3 are set in a twisted positional relationship.
The belt formed body 5 is not offset to the front end side of the roll. That is, the run-out amount of the tension roll 3 is adjusted such that the belt molded body 5 moves toward the base end of the roll (the right side in FIG. 5) at a speed of 0.8 to 2.3 mm / s.

The support housing 32 is formed with an arc-shaped long hole 32a centered on the rotation shaft 29, and an engagement pin 35 provided in the bearing housing 31 can be moved in the long hole 32a. And the range in which the vehicle can turn horizontally is restricted. In addition, a compression spring 36 that urges in a direction opposite to the pressing direction of the operation member 33 is interposed between the bearing housing 31 and the support housing 32, and elastically prevents the bearing housing 31 from being accidentally moved. The state is maintained.

The support housing 32 has a protruding portion 32b having a female screw portion 32a below.
A screw rod 37 provided on the second movable table 21 is screwed into the female screw portion 32a of b in such a manner as to be relatively rotatable. The screw rod 37 is connected to the drive motor 3 provided on the second movable base 21.
8 is driven to rotate. Therefore, by rotating the screw rod 37, the support housing 3 is rotated.
2 moves back and forth in the axial direction of the tension roll 3.

In the vicinity of the front end of the base 12, a wide belt molding 5 is provided with a belt 4 having a predetermined width from the front end.
The cutter means 41 for sequentially cutting is provided. The cutter means 41 has a circular blade 42 and is supported so as to be vertically movable, and rotates the circular blade 42 intermittently by 6 to 18 ° every time the belt 4 is cut. The rotation of the circular blade 42 is not performed during the belt width cutting operation.

As shown in detail in FIGS. 8 to 11, the circular blade 42 is supported by a lifting table 51. Elevator 5
1 has a main body 51a that supports the rotary blade 42, and a rod 51b that protrudes upward from the main body 51a,
The upper end of the rod portion 51b contacts an eccentric cam member 53 driven to rotate by a driving motor 52, and the eccentric cam member 53 causes the circular blade 42 to move up and down. The eccentric cam member 53 is configured to make one rotation after the main shaft roll 2 is fed by a predetermined amount by the servo motor 16. The main body 51a includes a cover member 5
4 are provided so that the exposed portion of the rotary blade 42 is reduced.

The motor mounting base 61 for supporting the drive motor 52 has a vertical slider 62 which is slidably engaged with a guide rail 64 provided on the base 63 in the vertical direction. ing. Motor mount 61
Is adjusted by the screw member 65 in accordance with the thickness of the belt molded body 5 and the like, and is fixed.

The motor mount 61 is provided with a guide member 66 having a vertical through hole 66a.
The rod portion 51 is inserted into the through hole 66a of the guide member 66.
b is movably inserted into the rod portion 51b, and a spring member 67 is provided in the rod portion 51b so as to urge the distal end portion in a direction in which the end portion contacts the eccentric cam member 53.

The lifting table 51 is provided with a ratchet pawl 55 which engages with a ratchet wheel 42a which is a part of the shaft of the circular blade 42 to stop the circular blade 42 during cutting. I have. When the circular blade 42 descends and rises, the circular blade 42 hits the claw portion of the ratchet wheel 42a, and
A spring plate 56 that rotates by 18 ° is provided. The rotation direction of the circular blade 42 is opposite to the rotation direction of the main spindle roll 2.

Further, the first movable table 11 includes a drive motor 13 for driving the main shaft roll 2 to rotate, a support member 73 for rotatably supporting a belt receiver 72 for receiving the belt 4 cut to a predetermined width. Is provided. The drive motor 13 is provided on the first movable base 11 via a motor base 74, and a drive pulley 74, which is rotationally driven by the drive motor 13, is attached to a driven pulley 75 fixed to the main shaft roll 2 by a synchro belt 76. Are linked through. The support member 73 includes a base 73a extending beyond the base 12 in parallel with the main shaft roll 2 on the side opposite to the main shaft roll 2, and a base end connected to a front end of the base 73a.
Horizontal portion 73b extending toward the main shaft roll 2 at right angles to
And a mounting portion 73c extending vertically downward from the tip of the intermediate horizontal portion 73b.

On the other hand, the belt receiver 72 is
The shaft portion 72a rotatably supported by the third mounting portion 73c.
And a receiving portion 72b that extends from the lower end of the shaft portion 72a to the distal end portion of the main shaft roll 2. This receiving part 7
2b, the belt 4 cut to a predetermined width and removed from the main shaft roll 2 is received.

Accordingly, the first movable base 11, the main shaft roll 2, the drive motor 71, the support member 73, and the belt receiver 72
Are supposed to move together.

Then, as shown in FIG. 12, air is blown from one side of the main spindle roll 2 to the thus-cut belt 4 of a predetermined width, from the roll base end side. Air blowing means 81 for imparting a twist for moving to the roll tip side by the rotational force of
Is provided. Here, the rotation direction T of the spindle roll 2
Is clockwise when viewed from the roll tip side of the main spindle roll 2.

As shown in FIG. 12, a plurality of rows of air nozzles 82 constituting the air blowing means 81 are arranged in a horizontal direction, and the air nozzles 82 are viewed from the roll tip side of the main spindle roll 2 with respect to the main spindle roll 2. In such a case, the peripheral surface of the belt molded body 5 is disposed on
Air of about / cm is blown out.

Next, a description will be given of a belt width cutting operation performed by the apparatus 1.

First, as shown in FIG.
A wide-width vulcanized belt formed body 5 is wound between the tension roll 3 and the tension roll 3, and the main shaft roll 2 is rotated, whereby the entire belt formed body 5 is rotated in the circumferential direction. The circular blade 42 is moved from the retracted position to the cutting position to enter the rotating belt molded body 5 by cutting, and the belt 4 having a predetermined width is cut. After cutting the belt 4, the circular blade 42 is moved to the retracted position. Therefore, the circular blade 42 only moves forward and backward in the direction perpendicular to the axis of the main spindle roll 2.

When the belt 4 having a predetermined width is cut, as shown in FIG. 14, by rotating the servo motor 16 by a predetermined amount, the main spindle roll 2 is maintained in the rotating state by a predetermined amount in the axial direction. Just move. At this time, the tension roll 3 does not move in the axial direction, and the main spindle roll 2 and the tension roll 3 are shifted in the axial direction. Due to the movement of the main shaft roll 2, the cut belt 4 is pulled by the moving force of the main shaft roll 2,
The state of being wound around the main shaft roll 2 is maintained, and the tension roll 3 is detached from the leading end.

In this way, the belt 4 can be moved only linearly between the retracted position and the cut position, that is, without moving the circular blade 42 in the width direction of the belt formed body 5.
Width cutting is performed accurately, so that cutting is performed accurately regardless of the belt thickness and the cutting width.

Thereafter, the amount of air supplied to the air cylinder 22 for controlling the position of the tension roll 3 according to the remaining belt width of the belt formed body 5 wound between the main spindle roll 2 and the tension roll 3 Is controlled to adjust the belt tension. This adjustment is performed, for example, so that the tension per unit width is constant throughout the width cutting operation. Therefore, an adverse effect of a change in tension due to a change in the width of the belt molded body 5 is avoided without being in an over-tension state.

On the other hand, the belt 4 having the predetermined width
On the other hand, air is blown from the base end of the roll through the air nozzle 82 to give a twist, as shown in FIG. 15, so that the rotational force of the main shaft roll 2 sends the cut belt 4 to the front end of the roll. Is automatically removed from the leading end of the spindle roll 2 and is received by a belt receiver 72 located at the leading end side of the roll and moving together with the spindle roll 2.

Further, by rotating the operation member 33 by a predetermined amount, the bearing housing 31 and the tension roll 3 are horizontally turned by a required amount, the amount of deflection of the tension roll 3 is adjusted, and the belt formed body 5 is moved to the roll base end side. It is controlled to move to. When the operating member 33 is rotated and returned to the original state, the bearing housing 31 and thus the tension roll 3 are returned to the original state by the bias of the compression spring 36.

The circular blade 42 for cutting the belt 4 having a predetermined width is rotated every time one cut is completed.
Since the width-cut portions are sequentially changed, the respective portions of the circular blade 42 are used equally, and the entire peripheral edge portion of the circular blade 42 can be effectively used. In addition, compared with the case where a blade having only a single blade portion is used, the blade can be used for a long period of time, and the circular blade 4 can be used.
It is also possible to reduce the replacement frequency of 2.

[0052]

The present invention is embodied in the form described above, and has the following effects.

In the belt width cutting device according to the present invention, each time a belt having a predetermined width is cut by the roll moving means, the main shaft roll is moved in the axial direction so that the cut belt is removed from the tension roll. As a result, the width of the belt can be cut without moving the blade, and a belt having a predetermined width can be cut accurately from a wide belt formed body. In addition, since the cut belt is wound around only the main shaft roll, it does not adversely affect the cutting operation of the remaining belt formed body.

Further, after the belt cut to a predetermined width comes off the tension roll, the belt tension is adjusted according to the belt width of the remaining belt formed body wound around the main spindle roll and the tension roll. If the adjusting means is provided, the belt tension can be adjusted according to the width change of the belt molded body, and the adverse effect of the tension change caused by the width change of the belt molded body can be avoided.

In this case, the tension roll has an air cylinder and is supported by roll support means capable of adjusting the distance between the tension roll and the main shaft roll by expansion and contraction of the air cylinder. By controlling the amount of air supply to the air cylinder of the roll support means according to the remaining belt width of the belt molded body,
It is possible to easily adjust the tension in a stepless manner.

Further, air is blown from one side of the main shaft roll to the cut belt having a predetermined width from a roll base end side, and a twist for moving the belt toward the roll tip side by the rotational force of the main shaft roll is provided. If air blowing means for applying is provided, air is blown from the base end of the roll to the cut belt to give a twist, and the rotational force of the main shaft roll causes one cut belt to move toward the front end of the roll. Can be sent.

When the belt compact wound around the main spindle roll and the tension roll is rotated, the amount of deflection of the tension roll can be adjusted so that the belt compact moves to the roll base end side of the main spindle roll. If the roll runout amount adjusting means is provided, the runout amount of the tension roll is adjusted by the roll runout amount adjusting means, and the belt molded body moves to the roll tip side by the rotation of the main shaft roll. Can be prevented.

In this case, the belt runout amount adjusting means includes:
A bearing housing rotatably supporting the base end of the tension roll, a support housing rotatably supporting the bearing housing, and pressing the bearing housing provided on the support housing with an abutting portion so that An operating member for horizontally turning the operating member, and an urging member provided on the support housing, for urging the bearing housing toward a side that comes into contact with a contact portion of the operating member. By operating the bearing housing horizontally by the required amount, the deflection amount of the tension roll can be easily adjusted.

The blade is configured as a circular blade, and the fixed blade is moved up and down by blade vertical movement means to cut a belt having a predetermined width from the belt formed body. If the blade is rotated by the blade rotating means, the portion to be cut in the belt width can be changed by the circular blade, and each portion of the circular blade can be used equally, and the entire circular blade can be used effectively.

Further, the roll moving means may include a movable base rotatably supporting the main spindle roll, and a belt receiver provided on the movable base and having the cut predetermined width and received by the main spindle roll. With this arrangement, the cut belt can be received in the belt receiver regardless of the position of the main shaft roll.

[Brief description of the drawings]

FIG. 1 is a front view of a belt width cutting device according to the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a side view of the same.

FIG. 4 is a diagram showing a relationship between a belt formed body and belt tension.

FIG. 5 is a plan view showing a roll deflection amount adjusting means of the tension roll according to the present invention.

FIG. 6 is a side view of the same.

FIG. 7 is a front view of the same.

FIG. 8 is a front view showing a schematic configuration of a lifting mechanism of the cutter means according to the present invention.

FIG. 9 is a side view of the same.

FIG. 10 is a rear view of the same.

11 is a sectional view taken along line AA in FIG.

FIG. 12 is a diagram showing a position of an air nozzle according to the present invention.

FIG. 13 is an explanatory diagram of a belt width cutting operation.

FIG. 14 is an explanatory diagram of a belt width cutting operation.

FIG. 15 is an explanatory diagram of a belt width cutting operation.

FIG. 16 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 belt width cutting device 2 main shaft roll 3 tension roll 4 belt 5 belt formed body 11 first movable base 22 air cylinder 31 bearing housing 32 support housing 36 compression spring 41 cutter means 42 circular blade 42a ratchet wheel 55 ratchet pawl 56 spring plate 72 belt receiver

Claims (8)

(57) [Claims] A wide belt formed body is wound between a main spindle roll and a tension roll with a predetermined belt tension, and the wide belt formed body is rotated by a blade to sequentially form a belt having a predetermined width. A belt width cutting device for cutting, the blade, a blade position switching means for moving between a cutting position for cutting a belt of a predetermined width from the belt formed body, and a retracted position away from the cutting position, After receiving a signal from the blade position switching means and cutting a belt of a predetermined width, the main shaft roll is moved by a predetermined amount in the axial direction with respect to the tension roll, and the cut belt of a predetermined width is moved from the tension roll. A belt width cutting device comprising a roll moving means for removing. 2. The method according to claim 2, wherein the cut belt having a predetermined width is removed from a tension roll, and then the belt is wound according to a remaining belt width of a belt formed body wound between the main spindle roll and the tension roll. The belt width cutting device according to claim 1, further comprising a tension adjusting unit that adjusts a belt tension. 3. The tension roll has an air cylinder, and is supported by roll support means capable of adjusting an interval between the tension roll and the main spindle roll by an expansion and contraction operation of the air cylinder. 3. The belt width cutting device according to claim 2, wherein the amount of air supplied to the air cylinder of the roll supporting means is controlled according to the remaining belt width of the formed body. 4. A method for blowing air from a roll base end side on one side of the main spindle roll to the cut belt having a predetermined width to move the belt to a roll tip end side by a rotational force of the main spindle roll. The belt width cutting device according to any one of claims 1 to 3, further comprising air blowing means for imparting a twist. 5. The swing of the tension roll so that the belt formed body moves to the roll base end side of the main shaft roll when the belt formed body wound around the main spindle roll and the tension roll is rotated. The belt width cutting device according to any one of claims 1 to 4, further comprising a roll runout amount adjusting means capable of adjusting the amount. 6. The belt run-out amount adjusting means is provided on the bearing housing for rotatably supporting a base end of the tension roll, a support housing for horizontally supporting the bearing housing, and provided on the support housing. An operating member which presses the bearing housing at a contact portion to horizontally turn the bearing housing to one side; and an urging member which is provided on the support housing and urges the bearing housing to a side contacting the contact portion of the operating member. The belt width cutting device according to claim 5, comprising a member. 7. The cutting tool is configured as a circular cutting tool. Further, when the cutting tool is moved to a retracted position after cutting a belt having a predetermined width from the belt molded body, the cutting tool is associated with the cutting tool. The belt width cutting device according to any one of claims 1 to 6, further comprising a blade rotating means for rotating. 8. The roll moving means includes a movable base rotatably supporting the main spindle roll, and a belt receiver provided on the movable base and receiving the cut belt having a predetermined width from the main spindle roll. A belt width cutting device according to claim 1.