JP2012179854A - Rubber sheet cutting device, and method for manufacturing raw tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cut a rubber sheet precisely and reliably by preventing cords from being exposed out of cut surfaces to be made while keeping manufacturing costs and running costs low.SOLUTION: A rubber sheet cutting device 1 that cuts a long rubber sheet W in which several cords extending in a direction perpendicular to the length direction are embedded in the perpendicular direction includes: a mounting table 13 having a mounting surface 11 on which the rubber sheet W is placed and a groove 12 which is formed in the mounting surface 11 and extends in the perpendicular direction; and a cutting blade 14 which is arranged so that it can move back and forth with respect to the mounting surface 11 and goes into the groove 12 and goes over the mounting surface 11 when it moves forward. A clearance is made between the other side of the cutting blade 14 across the mounting surface 11 and the rubber sheet W placed on the mounting surface 11 and a pair of support walls 24 between which the cutting blade 14 positioned at the end of its forward movement goes are arranged.

Description

  The present invention relates to a rubber sheet cutting apparatus and a green tire manufacturing method.

As a rubber sheet cutting device that cuts a long rubber sheet in which a plurality of cords extending in the crossing direction intersecting in the longitudinal direction are embedded in the crossing direction, as shown in, for example, the following Patent Document 1 Further, a mounting surface on which the rubber sheet is mounted, a mounting table formed on the mounting surface and having a concave portion extending in the intersecting direction, and disposed so as to be movable forward and backward with respect to the mounting surface. There is known a configuration including a cutting blade that enters into the concave portion when moving and exceeds the placement surface, and the cutting blade is movably disposed in an orthogonal direction orthogonal to the intersecting direction.
And at the time of a cutting | disconnection of a rubber sheet, it can suppress that a code | cord | chord is exposed to the cut surface produced | generated by moving a cutting blade to the said orthogonal direction according to the position of the code | cord | chord in a rubber sheet.

JP 2002-113688 A

  However, in the conventional rubber sheet cutting device, the cutting blade may move in the orthogonal direction in accordance with the position of the cord in the rubber sheet when cutting the rubber sheet. A mechanism for returning the position along the orthogonal direction with respect to the mounting table to the original position before cutting is required, which may increase the manufacturing cost and running cost of the apparatus.

  The present invention has been made in consideration of such circumstances, and while suppressing manufacturing cost and running cost, it is possible to suppress the cord from being exposed to the generated cut surface, and to accurately remove the rubber sheet. An object of the present invention is to provide a rubber sheet cutting device and a method for producing a green tire that can be reliably cut.

In order to solve the above-mentioned problems and achieve such an object, the rubber sheet cutting apparatus of the present invention is a long rubber sheet in which a plurality of cords extending in the crossing direction intersecting the longitudinal direction are embedded. A rubber sheet cutting device that cuts the rubber sheet in the crossing direction, and a mounting table that has a mounting surface on which the rubber sheet is mounted, and a recess that is formed on the mounting surface and extends in the crossing direction. A cutting blade that is disposed so as to be capable of advancing and retreating with respect to the mounting surface, and that enters the concave portion during forward movement and exceeds the mounting surface, and the cutting blade sandwiching the mounting surface On the opposite side, a gap is provided between the rubber sheet placed on the placement surface and a pair of support wall portions into which the cutting blade positioned at the forward end position enters. It is characterized by.
The raw tire manufacturing method of the present invention also includes a raw tire obtained by winding a fixed-length rubber sheet cut by cutting a long rubber sheet using a rubber sheet cutting device of the present invention on a molding drum. It is characterized by molding.

According to this invention, when the cutting blade is moved forward and the rubber sheet on the mounting surface is pushed toward the pair of support wall portions, the pair of support wall portions are initially not in contact with the rubber sheet. Therefore, the rubber sheet is not restrained by the pair of support walls.
Therefore, during the forward movement of the cutting blade, even if the cutting blade comes into contact with the hard part of the rubber sheet surface where the cord is embedded immediately inside, the hardness of the cutting blade is increased in the process of moving forward. Becomes a resistance, the hard part of the surface of the rubber sheet slides on the cutting blade, and on the cutting blade, the soft part of the surface of the rubber sheet in which the cord is not embedded immediately inside. It becomes possible to make it easy to pull in.
This makes it possible to cut the rubber sheet by inserting a cutting blade into the soft portion of the surface of the rubber sheet, and to suppress the cord from being exposed to the generated cut surface.
Further, when the cutting blade is positioned at the forward end position, the cutting blade enters between the pair of support wall portions. Therefore, when the cutting blade pierces the rubber sheet and starts cutting, the rubber sheet is attached to the pair of support walls. It is possible to suppress the positional deviation of the rubber sheet with respect to the cutting blade by contacting and supporting the portion.
Thereby, it becomes possible to apply a force efficiently from a cutting blade to the part located between a pair of support wall parts among rubber sheets, and can cut a rubber sheet accurately and reliably.
Furthermore, since the rubber sheet is moved on the cutting blade instead of the cutting blade in order to suppress the code from being exposed to the generated cut surface, for example, after the rubber sheet is cut, the mounting table of the cutting blade A mechanism or the like for returning the position in the direction perpendicular to the crossing direction to the original position before cutting is not required, and the above-described effects can be achieved while suppressing the manufacturing cost and running cost of this apparatus.

  Here, the pair of support wall portions may be arranged on the opposite side of the recessed strip portion sandwiching the mounting surface, with a gap larger than the thickness of the rubber sheet between the mounting surface and the mounting surface. Good.

  In this case, since the pair of support wall portions are disposed on the opposite side of the cutting blade that sandwiches the placement surface and on the opposite side of the concave portion that sandwiches the placement surface, the cutting blade faces the placement surface. Then, when the blade is moved forward, the cutting blade reaches the rubber sheet placed on the placement surface when projecting from the inside of the concave portion toward the outside thereof. Therefore, the rubber sheet is pushed toward the pair of support wall portions while being deformed or displaced toward the outer side of the concave portion along with the forward movement toward the mounting surface of the cutting blade. This makes it possible to avoid the deformation and displacement of the rubber sheet from being constrained by the wall surface that defines the recess, and after the cutting blade is moved forward, the cutting blade pierces the rubber sheet. Until the cutting is started, the hard portion of the surface of the rubber sheet can be reliably slid on the cutting blade.

  In addition, the holding means is provided so as to be able to advance and retreat with respect to the opening peripheral edge of the concave portion on the mounting surface, and the pressing means cuts the rubber sheet on the mounting surface by the cutting blade. Prior to this, the rubber sheet may be configured such that a portion of the rubber sheet positioned at the opening peripheral edge of the concave strip is pressed onto the mounting surface until the cutting of the rubber sheet is completed.

  In this case, since the pressing means is provided, it is possible to prevent the rubber sheet from being displaced with respect to the cutting blade between the start of cutting and the completion of cutting. Can be cut into pieces.

  Further, the front end portion of the long rubber sheet can be held, and is disposed so as to be able to advance and retreat in the longitudinal direction across the concave stripe portion, and is disposed so as to be able to advance and retreat with respect to the mounting surface. The first holding member and the rear end portion of the fixed-length rubber sheet cut by the cutting blade from the long rubber sheet can be held, and advance and retreat in the longitudinal direction across the recess And a second holding member arranged to be capable of moving back and forth with respect to the mounting surface, and the second holding member may also serve as the pressing means.

In this case, first, the first holding member and the second holding member are positioned behind the concave strip portion, and then the first holding member is moved forward toward the placement surface to be long by the first holding member. After holding the front end portion of the scale-shaped rubber sheet, the first holding member is moved backward from the placement surface together with the front end portion of the rubber sheet, and is moved to the front of the recess. As a result, the long rubber sheet is pulled forward by a fixed amount from the recess on the mounting surface.
Next, the second holding member is moved forward toward the placement surface, and the corresponding portion located at the opening peripheral edge of the concave portion of the rubber sheet on the placement surface is placed by the second holding member. Press down on.
Then, as described above, the long rubber sheet is cut by the cutting blade to cut out the fixed length rubber sheet.
Here, the second holding member holds the corresponding portion of the rubber sheet between the time when the corresponding portion of the long rubber sheet is pressed onto the mounting surface and the fixed length rubber sheet is cut off. Hold.
Next, among the fixed length rubber sheets, the front end portion is held by the first holding member, and the rear end portion corresponding to the corresponding portion is held by the second holding member. As long as the rear end portion of the fixed length rubber sheet is moved backward from the mounting surface, both the first holding member and the second holding member are moved forward to convey the fixed length rubber sheet forward. It becomes possible.
From the above, coupled with the fact that the second holding member also serves as a pressing means, while avoiding the increase in size and cost of the apparatus, the rubber sheet can be cut more accurately and reliably, Cutting and conveying efficiency can be improved.

  According to the rubber sheet cutting device and the raw tire manufacturing method according to the present invention, it is possible to suppress the cord from being exposed to the generated cut surface while suppressing the manufacturing cost and the running cost, It can be cut accurately and reliably.

It is a rubber sheet cutting device shown as an embodiment according to the present invention, and is a view showing a first step. It is a rubber sheet cutting device shown as an embodiment according to the present invention, and is a view showing a second step. It is a rubber sheet cutting device shown as an embodiment according to the present invention, and is a view showing a third step.

Hereinafter, an embodiment of a rubber sheet cutting device according to the present invention will be described with reference to FIGS. 1, 2, and 3.
The rubber sheet cutting device 1 is configured to cut, in the intersecting direction, a long rubber sheet W in which a plurality of cords extending in the intersecting direction intersecting the longitudinal direction are embedded, and the rubber sheet W is placed thereon. And a mounting table 13 having a mounting surface 11 formed on the mounting surface 11 and a recess 12 formed in the mounting surface 11 and extending in the crossing direction. And a cutting blade 14 that enters the recess 12 and exceeds the mounting surface 11.

  The cutting device 1 further rotates the roll body R in which the long rubber sheet W is wound in a roll shape along with the liner L along the longitudinal direction, thereby rotating the rubber sheet W around the mounting table 13 side. A feeding device 15 that feeds the rubber sheet W between the feeding device 15 and the mounting table 13 and guides the rubber sheet W from the feeding device 15 onto the mounting surface 11 of the mounting table 13. Conveying means 17 for conveying the upper rubber sheet W in the longitudinal direction opposite to the feeding device 15 side is provided.

In the illustrated example, the mounting surface 11 extends along the horizontal direction, faces upward in the vertical direction, and displays the long rubber sheet W fed out from the feeding device 15 in the longitudinal direction. It is comprised so that it may support from the downward direction of a perpendicular direction in the state which orient | assigned the back surface to the perpendicular direction.
Hereinafter, the direction from the feeding device 15 side toward the mounting table 13 side is referred to as the front, and the opposite direction is referred to as the rear.
Furthermore, in the present embodiment, the intersecting direction coincides with the left-right direction orthogonal to the front-rear direction in the horizontal direction.

The mounting table 13 extends along the front-rear direction and has a rear end portion that is adjacent to the delivery roller 16 from the front and a supply stand 18 that extends along the front-rear direction and the rear end portion of the mounting table 13 at the supply stand 18. A fixed length base 19 adjacent from the front, and the upper surfaces of the two bases 18 and 19 form the mounting surface 11 described above.
In the present embodiment, the concave strip 12 is a gap in the front-rear direction between the supply base 18 and the fixed length base 19 and penetrates the mounting base 13 in the vertical direction. The length in the left-right direction of each of the mounting surface 11 and the concave strip portion 12 is wider than the width of the rubber sheet W.

  The cutting blade 14 is disposed so as to be able to advance and retreat with respect to the mounting surface 11 in a direction orthogonal to the creeping direction along which the mounting surface 11 extends, that is, in the illustrated example, along the vertical direction. Further, the cutting blade 14 is disposed below the mounting surface 11 in the vertical direction, and when the cutting blade 14 moves forward toward the mounting surface 11, the distal end portion of the cutting blade 14 is moved from the inside of the concave portion 12. By projecting upward on the outer side, the mounting surface 11 is disposed so as to extend from below to above.

  Furthermore, in the present embodiment, the size in the left-right direction of the cutting blade 14 is smaller than the width of the rubber sheet W, and the cutting blade 14 can travel in the concave portion 12 along the left-right direction. By being arranged, the rubber sheet W can be cut over its entire width. In addition, the cutting blade 14 is divided into two in the left-right direction, and is positioned at the center in the left-right direction of the mounting surface 11 and the recessed strip portion 12 during standby before cutting, and each of the cutting blades 14 is divided. The body is disposed so as to approach and separate by traveling in the left and right directions in the concave strip portion 12 in opposite directions.

The feeding device 15 is disposed rotatably on the drive shaft 20 that supports the roll body R so as to be rotatable about the axis thereof, and is rotated above the drive shaft 20 while peeling the liner L of the roll body R from the rubber sheet W. A take-up shaft 21 for winding. Each axis of the drive shaft 20 and the take-up shaft 21 extends along the left-right direction.
The supply rollers 16 are rotatably arranged around the rotation axis extending in the left-right direction, and a pair of supply rollers 16 are arranged at intervals in the front-rear direction. A festoon F is provided between the supply rollers 16. It is arranged.

  The conveying means 17 is disposed so as to be able to hold the front end portion of the long rubber sheet W and to be able to advance and retreat in the front-rear direction across the concave strip portion 12, and in the vertical direction with respect to the placement surface 11. The first holding member 22 disposed so as to be able to advance and retreat, and the rear end portion of the fixed-length rubber sheet W1 cut from the long rubber sheet W by the cutting blade 14 can be held, and the recess 12 The second holding member 23 is disposed so as to be able to advance and retract in the front-rear direction across the straddle, and to be able to advance and retract in the vertical direction with respect to the placement surface 11.

  The first holding member 22 is located in front of the second holding member 23. In each of the holding members 22 and 23, vacuum pads 22a and 23a are disposed on the suction surface facing the lower mounting surface 11, and the rubber sheet W is held by the suction force from the vacuum pads 22a and 23a. It has become so. The suction surfaces of both the holding members 22 and 23 extend over the entire region in the left-right direction of the concave portion 12, and a large number of vacuum pads 22a and 23a are disposed over the entire region of the suction surface. Both end portions in the front-rear direction of the rubber sheet W1 can be sucked and held over the entire region in the left-right direction.

Both holding members 22, 23 are installed on a pair of left and right guide rails (not shown) extending above the mounting table 13 in the front-rear direction so as to be able to advance and retreat in the front-rear direction. Further, the holding members 22 and 23 are configured to convey the fixed-length rubber sheet W1 forward in a state in which both end portions in the front-rear direction are held, and at least the first of the holding members 22 and 23 is the first. The holding member 22 reaches a molding drum (not shown) positioned in front of the mounting table 13 and directly arranges the front end portion of the fixed-length rubber sheet W1 on the molding drum.
Further, in the present embodiment, the second holding member 23 is formed on the peripheral edge of the opening of the recess portion 12 in the rubber sheet W before the cutting blade 14 cuts the rubber sheet W on the placement surface 11. The corresponding portion located is pressed onto the mounting surface 11 until the cutting of the rubber sheet W is completed.

And in this embodiment, as FIG. 2 shows, a clearance gap is provided between the rubber sheet W mounted on the mounting surface 11, on the opposite side of the cutting blade 14 which pinches | interposes the mounting surface 11, A pair of support wall portions 24 through which the cutting blade 14 located at the forward end position enters are disposed.
The pair of support wall portions 24 are disposed on the opposite side of the concave strip portion 12 sandwiching the placement surface 11 in the vertical direction with a gap larger than the thickness of the rubber sheet W between the placement surface 11. .

In the illustrated example, the pair of support wall portions 24 are attached to the second holding member 23 and move together with the second holding member 23.
The pair of support wall portions 24 are configured so that the second holding member 23 presses the corresponding portion of the rubber sheet W on the placement surface 11 onto the placement surface 11 as will be described later. And is opposed to the concave strip portion 12 and the cutting blade 14 in the vertical direction with the rubber sheet W interposed therebetween.

Further, a pair of support wall portions 24 are disposed above the placement surface 11 with a space in the front-rear direction. Moreover, the upper ends of a pair of support wall part 24 are connected by the top wall part 24a from which front and back extend along a horizontal direction. Further, of the pair of support wall portions 24, the support wall portion 24 positioned forward is attached to the rear end portion of the second holding member 23.
The space | interval of the front-back direction of a pair of support wall part 24 is smaller than the magnitude | size of the front-back direction of the groove part 12, and is the space | interval of the cords adjacent in the longitudinal direction in the rubber sheet W, or the front-back direction of the cutting blade 14 It is larger than the size of. The size of the pair of support wall portions 24 in the left-right direction is smaller than the size of the concave portion 12 in the left-right direction and the width of the rubber sheet W, and larger than the size of the cutting blade 14 in the left-right direction. .

  Here, the pair of support wall portions 24 are not extended over the entire region in the left-right direction of the concave strip portion 12, but the cutting blade 14 moves forward toward the placement surface 11 and pierces the rubber sheet W. It is limited to the cutting start position. In the illustrated example, the cutting start end position is the center portion in the left-right direction of the mounting surface 11 and the recessed strip portion 12 on which the two cutting blades 14 are positioned at the time of standby before cutting. .

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

  First, in a state where the front end edge of the long rubber sheet W is positioned on the concave strip portion 12 and the first holding member 22 is positioned at the front end portion of the supply base 18 (FIG. 1), the first holding member. 22 is moved forward toward the mounting surface 11, and the front end portion of the rubber sheet W is sucked and held by the first holding member 22. Next, after the first holding member 22 is moved backward from the placement surface 11, the reel L of the roll body R is peeled off from the rubber sheet W by the take-up shaft 21 and wound up in the feeding device 15. The rubber sheet W is fed forward from the roll body R on the drive shaft 20 via the supply roller 16 and the festoon F, and the first holding member 22 is straddled forward along the recess 12 with the front end portion of the rubber sheet W. Then, it is moved onto the front end of the fixed length table 19. As a result, the long rubber sheet W is withdrawn in a predetermined amount forward from the recess 12 on the mounting surface 11.

On the other hand, the second holding member 23 is moved onto the rear end portion of the fixed length base 19 with the concave strip portion 12 straddling forward. Then, the second holding member 23 is moved forward toward the placement surface 11, and the corresponding portion of the rubber sheet W on the placement surface 11 is pressed onto the placement surface 11 by the second holding member 23. At the same time, it is sucked and held (FIG. 2).
At this time, the pair of support wall portions 24 are opposed to the concave portion 12 and the cutting blade 14 in the vertical direction with the rubber sheet W interposed therebetween, and are spaced upward from the rubber sheet W. In the illustrated example, the second holding member 23 presses a portion of the corresponding portion of the rubber sheet W positioned in front of the concave strip portion 12 on the placement surface 11.

Then, the rubber blade W is moved by the cutting blade 14 by moving the cutting blade 14 forward toward the mounting surface 11, projecting upward from the inside of the concave portion 12 and reaching the mounting surface 11 from below. Breaking down while pushing between the pair of support wall portions 24 from below to above.
Next, each divided body of the cutting blade 14 travels separately inside the concave portion 12 toward the outer side in the left-right direction, is separated from each other, and the rubber sheet W is cut over its entire width, whereby a fixed length rubber is obtained. Cut the sheet W1.

  Then, after the cutting blade 14 is moved backward from the placement surface 11 and the second holding member 23 is moved backward from the placement surface 11 together with the rear end portion of the fixed length rubber sheet W1 as the corresponding portion, both By moving the holding members 22 and 23 forward, the fixed length rubber sheet W1 having the front end held by the first holding member 22 and the rear end held by the second holding member 23 is conveyed forward. (FIG. 3). Thereafter, when the first holding member 22 is made to reach the forming drum together with the front end portion of the fixed length rubber sheet W1, the fixed length rubber sheet W1 is released from both the holding members 22 and 23 and wound around the forming drum. Mold the tire.

As described above, according to the rubber sheet cutting device 1 according to the present embodiment, the cutting blade 14 is moved forward to push the rubber sheet W on the mounting surface 11 toward the pair of support wall portions 24. Accordingly, since the pair of support wall portions 24 are initially not in contact with the rubber sheet W, the rubber sheet W is not restrained by the pair of support wall portions 24 at all.
Therefore, when the cutting blade 14 moves forward, even if the cutting blade 14 abuts against a hard portion of the surface of the rubber sheet W in which the cord is embedded immediately inside, the cutting blade 14 moves forward. When the hardness becomes resistance, the hard portion of the surface of the rubber sheet W slides on the cutting blade 14, and the cord is placed on the cutting blade 14 immediately inside the surface of the rubber sheet W. It becomes possible to make it easy to draw in a soft part in which no is embedded.
Thereby, it becomes possible to cut the rubber sheet W by inserting the cutting blade 14 into the soft part of the surface of the rubber sheet W, and it is possible to suppress the code from being exposed to the generated cut surface.

Further, when the cutting blade 14 is positioned at the forward end position, the cutting blade 14 enters between the pair of support wall portions 24. Therefore, when the cutting blade 14 pierces the rubber sheet W and starts cutting, the rubber sheet W It is possible to support the rubber sheet W with respect to the cutting blade 14 by abutting against the pair of support wall portions 24 to suppress the positional deviation of the rubber sheet W.
Thereby, it becomes possible to apply force efficiently from the cutting blade 14 to a portion located between the pair of support wall portions 24 in the rubber sheet W, and the rubber sheet W can be cut accurately and reliably. it can.

  Furthermore, since the rubber sheet W is moved on the cutting blade 14 instead of the cutting blade 14 in order to suppress the code from being exposed to the generated cut surface, for example, after the rubber sheet W is cut, the cutting blade 14, the mechanism for returning the position in the front-rear direction with respect to the mounting table 13 to the original position before cutting is unnecessary, and the above-described effects can be achieved while suppressing the manufacturing cost and running cost of the apparatus 1.

In addition, since the pair of support wall portions 24 are disposed on the opposite side of the cutting blade 14 sandwiching the placement surface 11 and on the opposite side of the concave strip portion 12 sandwiching the placement surface 11, the cutting blade 14 is provided. When moving forward toward the mounting surface 11, the cutting blade 14 reaches the rubber sheet W mounted on the mounting surface 11 when protruding from the inside of the concave portion 12 toward the outside thereof. It becomes.
Therefore, the rubber sheet W is pushed toward the pair of support wall portions 24 while being deformed or displaced toward the outside of the concave strip portion 12 as the cutting blade 14 moves forward toward the mounting surface 11. Will be. Thereby, it becomes possible to avoid that the deformation | transformation and displacement of this rubber sheet W are restrained by the wall surface which defines the groove part 12, and after moving the cutting blade 14 forward, the cutting blade 14 is moved forward. Until the rubber sheet W is pierced and cutting is started, the hard portion of the surface of the rubber sheet W can be reliably slid on the cutting blade 14.

  Furthermore, in the present embodiment, the second holding member 23 cuts the corresponding portion of the rubber sheet W by cutting the rubber sheet W before the cutting blade 14 cuts the rubber sheet W on the placement surface 11. Since the sheet is pressed onto the mounting surface 11 until the completion of the cutting, the rubber sheet W can be prevented from being displaced with respect to the cutting blade 14 between the start of the cutting and the completion of the cutting. W can be cut more accurately and reliably.

Furthermore, since the conveying means 17 includes the second holding member 23, the rubber sheet W can be cut more accurately and reliably while avoiding an increase in size and cost of the apparatus.
Further, after the cutting, if the second holding member 23 is moved backward from the placement surface 11 together with the rear end portion of the fixed length rubber sheet W1, both the first holding member 22 and the second holding member 23 are moved forward. By moving it, the fixed length rubber sheet W1 can be conveyed forward, so that the cutting and conveying efficiency can be improved.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, in the said embodiment, although the structure which penetrates the mounting base 13 in the perpendicular direction was shown as the concave strip part 12, it is not restricted to this, The non-penetrating to the mounting base 13 may be sufficient. In this configuration, the cutting blade 14 may be disposed in a non-penetrating recess.
Moreover, although the structure which has the supply stand 18 and the fixed length stand 19 was shown as the mounting base 13, these 18 and 19 are integrally formed, and the groove-shaped recessed strip part extended in the said cross direction on the surface is shown. You may employ | adopt the formed structure.

Furthermore, the feeding device 15 and the supply roller 16 need not be arranged.
Moreover, the mounting surface 11 may extend in a direction intersecting the horizontal direction, and may be further directed downward in the vertical direction.
Further, the size of the cutting blade 14 in the left-right direction may be equal to or greater than the width of the rubber sheet W. In this case, the cutting blade 14 does not have to travel in the left-right direction within the concave strip portion 12. Furthermore, although the structure divided | segmented into the said left-right direction as the cutting blade 14 was shown, it may be integral.

Further, the second holding member 23 presses the corresponding portion of the rubber sheet W onto the mounting surface 11 before the cutting blade 14 cuts the rubber sheet W on the mounting surface 11. It may be after the blade 14 starts moving forward toward the placement surface 11.
Further, the second holding member 23 sucks and holds the corresponding portion of the rubber sheet W from the time when the second holding member 23 presses the corresponding portion onto the placement surface 11. Any time from when the cutting of W is completed to before the backward movement of the mounting surface 11 may be used.

  Further, the first holding member 22 and the second holding member 23 are not limited to the configuration in which the rubber sheet W is held by the suction force from the vacuum pads 22a and 23a, but when the cord in the rubber sheet W is, for example, steel or the like. The rubber sheet W may be magnetically attached by the magnetic force of the magnet. In addition, when a code | cord is steel etc., you may embed a magnet in the mounting surface 11, for example.

  Further, separately from the second holding member 23 or without providing the second holding member 23, a pressing means capable of moving forward and backward with respect to the opening peripheral portion of the concave portion 12 on the mounting surface 11 is provided, Prior to the cutting blade 14 cutting the rubber sheet W on the mounting surface 11, the pressing means is moved forward toward the mounting surface 11, and the corresponding portion of the rubber sheet W is moved to the rubber sheet. You may make it hold on the mounting surface 11 by this pressing means until the cutting | disconnection of W is completed.

Furthermore, the cutting blade 14 may be positioned above the mounting surface 11 in the vertical direction, and the support wall portion 24 may be positioned below the vertical direction. In this configuration, the support wall portion 24 may be disposed in the recessed strip portion 12.
The support wall portion 24 may be separated from the second holding member 23, the pair of support wall portions 24 may not be connected to each other by the top wall portion 24a, and the pair of support wall portions 24 The position may be fixed with respect to the mounting table 13.
The conveying means 17 and the pressing means may not be provided.
The mounting table 13 may be a belt conveyor without providing the conveying means 17.

Moreover, in the said embodiment, although the said left-right direction was shown as the said crossing direction where the code | cord | chord in the rubber sheet W extends, you may change suitably not only this.
Furthermore, although a part of the apparatus which shape | molds a raw tire was shown as the cutting apparatus 1 of the rubber sheet W, you may apply to other uses not only this.

  In addition, it is possible to appropriately replace the constituent elements in the above-described embodiments with well-known constituent elements without departing from the gist of the present invention, and the above-described modified examples may be appropriately combined.

  While suppressing manufacturing cost and running cost, it can suppress that a cord is exposed to the cut surface generated, and can cut a rubber sheet accurately and reliably.

DESCRIPTION OF SYMBOLS 1 Rubber sheet cutting device 11 Mounting surface 12 Recessed section 13 Mounting table 14 Cutting blade 22 First holding member 23 Second holding member (pressing means)
24 Supporting wall W Long rubber sheet

Claims (5)

A rubber sheet cutting device for cutting a long rubber sheet in which a plurality of cords extending in the cross direction intersecting the longitudinal direction are embedded in the cross direction,
A mounting surface on which the rubber sheet is mounted, and a mounting table having a concave portion formed on the mounting surface and extending in the intersecting direction;
A cutting blade that is disposed so as to be capable of advancing and retreating with respect to the placement surface and that enters the concave portion during forward movement and exceeds the placement surface;
With
On the opposite side of the cutting blade across the mounting surface, a gap is provided between the cutting blade and the rubber sheet placed on the mounting surface, and the cutting blade positioned at the forward end position enters between A rubber sheet cutting device, wherein a pair of supporting wall portions are disposed. The rubber sheet cutting device according to claim 1,
The pair of support wall portions are arranged on the opposite side of the concave portion sandwiching the mounting surface, with a gap larger than the thickness of the rubber sheet between the mounting surface and the mounting surface. A rubber sheet cutting device. The rubber sheet cutting device according to claim 1 or 2,
Comprising pressing means disposed so as to be capable of advancing and retreating with respect to the opening peripheral edge portion of the concave strip portion on the placement surface,
Prior to the cutting blade cutting the rubber sheet on the mounting surface, the pressing means is configured to cut a portion of the rubber sheet positioned at the peripheral edge of the opening of the concave strip. A rubber sheet cutting device characterized by being configured to be pressed onto the mounting surface until completion. The rubber sheet cutting device according to claim 3,
The front end of the long rubber sheet can be held, and is disposed so as to be able to advance and retreat in the longitudinal direction across the recess, and is disposed so as to be able to advance and retreat with respect to the mounting surface. A first holding member;
While being able to hold the rear end portion of the fixed length rubber sheet cut by the cutting blade from the long rubber sheet, and disposed so as to be able to advance and retreat in the longitudinal direction across the concave strip portion, A second holding member disposed so as to be movable back and forth with respect to the placement surface;
Is provided,
The rubber sheet cutting device, wherein the second holding member also serves as the pressing means.   A raw tire is formed by winding a fixed-length rubber sheet obtained by cutting a long rubber sheet using the rubber sheet cutting device according to claim 1 on a molding drum. Production method.

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