JP2013043392A - Cutting device and cutting method for rubber strip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting method that prevents formed strip members from being varied in length and so on by effectively suppressing the unintended mutual bonding of cut surfaces after an intermittently fed rubber strip is cut to a predetermined length.SOLUTION: A cutting device includes a movable cutter 1 which is arranged on a top-surface side of a rubber strip 30 and displaceable toward a width direction, a pair of surface press members 2, 3 which are provided at the top-surface side on a front and a rear side in a feed direction across the movable cutter, and an elevation means 4 which is arranged at a reverse-surface side, and elevates and displaces the rubber strip to hold and fix the rubber strip with the surface press members. One of the pair of surface press members which are positioned across the movable cutter is arranged closer to a surface of the rubber strip in a feed attitude than the other surface press member, and a holding fixation position for the rubber strip between one surface press member and strip elevation means is made lower than a holding fixation position of the other surface press member.

Description

  The present invention relates to a rubber strip cutting device for cutting a rubber strip intermittently fed over a predetermined length in one direction into a predetermined length and a method for cutting the rubber strip. In particular, it proposes a technology that can effectively cut the rubber strip at the desired length by effectively suppressing mutual unintended adhesion of the cut surfaces after cutting the rubber strip. is there.

  For example, when manufacturing a pneumatic tire, a plurality of steel cords or organic fiber cords or the like are coated with unvulcanized rubber, and the inside of the formed rubber strip has a required angle with respect to the longitudinal direction thereof. A plurality of cords extending in a slanted manner are embedded, and the rubber strip is cut at a predetermined angle and a predetermined length with respect to the longitudinal direction to form a strip member having a predetermined length, and thereafter A belt layer material having a cylindrical shape may be formed by winding the strip member around the outer periphery of the belt-tread molding drum directly or indirectly.

  Here, for the above-described cutting of the rubber strip, as schematically shown in FIG. 5, the rubber strip 101 is intermittently fed over a predetermined length on the conveyor 100 toward the right side of the drawing. A movable cutter 102 that is disposed on the front surface side (upper surface side in the figure) and that can be displaced in the width direction of the rubber strip 101 for cutting the rubber strip 101, and a movable cutter on the front surface side of the rubber strip 101 A pair of surface pressing members 103a and 103b provided on the rear side and the front side in the feeding direction of the rubber strip 101 with a gap 102 therebetween, and disposed on the back surface side (lower surface side in the figure) of the rubber strip 101. The strip 101 is moved upwardly and directly below the movable cutter 102 toward the movable cutter 102 and the surface pressing members 103a and 103b, and the respective surface pressing members are moved. Member 103a, has been decided to use a cutting device comprising a strip lifting means 104 for pinching fixing the rubber strip 101 between 103b.

In order to cut the rubber strip 101 using this cutting device, first, the feeding of the rubber strip 101 fed toward the right side of the figure on the conveyor 100 is as shown in FIG. Stop at a predetermined position.
Next, the strip raising means 104 is operated, and the rubber strip 101 is displaced upwardly toward the movable cutter 102 and the surface pressing members 103a and 103b, as shown in FIG. The rubber strip 101 is sandwiched and fixed between 103b and the strip raising means 104, and the movable cutter 102 is displaced in the width direction of the rubber strip 101 while the movable cutter 102 is stuck into the rubber strip 101. Then, the rubber strip 101 is cut.

After that, the strip lifting means 104 is moved downward as shown in FIG. 5C to release the sandwiched and fixed state of the rubber strip between the surface pressing means 103a and 103b. Each of the strip member 101a formed on the front side in the feeding direction by cutting and the rubber strip 101b located on the rear side in the feeding direction are again arranged on the conveyor 100, as shown in FIG. 5 (d). Then, the feeding of the strip member 101a and the rubber strip 101b by the conveyor 100 is resumed.
Although illustration is omitted, after that, the strip member 101a is conveyed to the belt-tread molding drum by the conveyor 100, and is wound around the belt-tread molding drum in the conveying posture.

  By the way, in the above-described conventional cutting device, when the movable cutter 102 is displaced in the width direction of the rubber strip 101 and the rubber strip 101 is cut, as shown in FIG. 103b and the strip raising means 104, the rubber strip portions positioned on the front side and the rear side in the strip feeding direction with the movable cutter 102 interposed therebetween are sandwiched and fixed at the same height from the conveyor 100. Therefore, after cutting with the movable cutter 102, the respective cut surfaces of the rubber strip 101b and the strip member 101a which are located in close proximity to each other are caused by the adhesive force inherent to the unvulcanized rubber material. It may adhere without.

  In this case, it is necessary to perform the work of peeling the cut surface of the strip member 101a from the cut surface of the rubber strip 101b on the conveyor 100. As a result of the rubber strip 101b being dragged, the rubber strip 101b is displaced on the conveyor 100. As a result, the conveyor 100 intermittently feeds the rubber strip 101b over a predetermined length. Therefore, there is a possibility that the length of the strip member to be formed may vary.

Further, due to the positional deviation of the rubber strip 101b on the conveyor 100, a strip member which is conveyed by the conveyor 100 after being cut by the above-described cutting device and wound around the belt-tread molding drum in the conveying posture is provided. The belt / tread molding drum may not be disposed at a predetermined position in the axial direction.
As a result, there is a problem that the quality of the tire to be manufactured is inevitably deteriorated.

  The present invention aims to solve such problems of the prior art, and the object of the present invention is to intermittently feed a predetermined length in one direction. When cutting the rubber strip to a predetermined length, it is possible to effectively suppress unintentional bonding between the cut surfaces after cutting the rubber strip, and to peel the bonded cut surfaces apart. It is another object of the present invention to provide a rubber strip cutting device and a cutting method capable of preventing the occurrence of variations in length of strip members formed by subsequent cutting.

The rubber strip cutting device of the present invention is provided on the surface side of a rubber strip that is intermittently fed over a predetermined length in one direction, and is used for cutting the rubber strip. A movable cutter displaceable in the width direction, a pair of surface pressing members provided on the front side and the rear side in the feeding direction of the rubber strip across the movable cutter on the surface side of the rubber strip, and rubber The strip ascending is arranged on the back side of the strip so that the rubber strip is displaced upwardly and directly below the movable cutter toward the movable cutter and the surface pressing member, and the rubber strip is sandwiched and fixed between the respective surface pressing members. Comprising means,
Either one of the pair of surface pressing members positioned across the movable cutter is disposed closer to the rubber strip surface than the other surface pressing member with respect to the rubber strip in the feeding posture. And the strip lifting means, the sandwiching and fixing position of the rubber strip is made lower than the sandwiching and fixing position of the other surface pressing member.

  Preferably, the one surface pressing member arranged close to the surface of the rubber strip is a surface pressing member located on the front side in the feeding direction of the rubber strip among the pair of surface pressing members.

Further, here, the strip raising means includes a back surface pressing plate facing one surface pressing member, a supporting portion for supporting the back surface pressing plate from the lower side, and a back surface pressing portion facing the other surface pressing member. It is preferable to include a lifting member and an elastic body interposed between the back surface pressing plate and the support portion.
In this case, it is preferable that the back surface pressing plate is disposed on the front side in the feeding direction of the rubber strip with respect to the back surface pressing portion of the elevating member with a movable cutter therebetween.

  Further, the movable cutter has a pair of blades that are spaced apart from each other from a posture that pierces the intermediate region in the width direction of the rubber strip, and cuts the rubber strip from the intermediate region toward each side edge of the rubber strip. It is preferable to have a part.

  Preferably, the contact surface of the one surface pressing member disposed close to the surface of the rubber strip is set to be 2.0 mm to 6.6 more than the similar contact surface of the other surface pressing member. Position 0 mm lower.

  By the way, in the position adjacent to the front side or the rear side in the feeding direction of the rubber strip, of the other surface pressing member arranged apart from the rubber strip surface among the pair of surface pressing members, It is preferable to provide an adsorption holding means for adsorbing and fixing the rubber strip in the upward displacement posture based on the operation, for example, by negative pressure adsorption or magnetic adsorption.

  Here, when any one of the above-described cutting devices is used for cutting a rubber strip having a steel cord embedded therein, the suction holding means includes a magnet member that magnetically attracts the rubber strip, It is preferable that the magnet member is housed inside and the magnet member is constituted by an adsorption release sleeve that moves forward and backward with respect to the rubber strip.

Further, the rubber strip cutting method of the present invention cuts a rubber strip intermittently fed over a predetermined length in one direction into a predetermined length.
In a state where the feeding of the rubber strip is temporarily stopped, the rubber strip is lifted from the back surface side, and the rubber strip is lifted and displaced toward the movable cutter provided on the front surface side thereof,
The rubber strip portions positioned on the front side and the rear side in the feeding direction across the movable cutter are sandwiched and fixed at different heights from the front side and the rear side of the rubber strip, and the movable cutter is fixed. The rubber strips are displaced in the width direction of the rubber strips to cut the rubber strips. Thereafter, the sandwiched and fixed state of the respective rubber strip portions is released, and the feeding of the rubber strips is resumed.

According to the rubber strip cutting device of the present invention, either one of the pair of surface pressing members positioned across the movable cutter is brought closer to the rubber strip surface than the other surface pressing member with respect to the rubber strip in the feeding posture. By placing the rubber strip between the one surface pressing member and the strip lifting means, the rubber strip is fixed at a lower position than the pinching fixed position at the other surface pressing member. After the rubber strip is cut by the movable cutter displaced in the width direction, the cutting surface of the strip member on the front side in the strip feeding direction and the cutting surface of the rubber strip on the rear side in the feeding direction are Based on the fact that the heights of the pinching and fixing positions are different from each other, they are located apart from each other, so that the cut surfaces after the rubber strip are cut can be bonded together. It is possible to prevent the.
Therefore, in this cutting device, the peeling work of the bonded cut surface becomes unnecessary, and the positional deviation of the rubber strip on the conveyor due to the peeling work can be surely prevented. The rubber strip can always be cut to the expected length, and the winding position of the formed strip member, which is conveyed by a conveyor, etc., around the belt-tread molding drum is always appropriate. can do.

  Here, when the one surface pressing member arranged close to the surface of the rubber strip is a surface pressing member located on the front side in the feeding direction of the rubber strip of the pair of surface pressing members, After the strip is cut, when the sandwiched state of the rubber strip is released, for example, the strip on the front side in the strip feeding direction arranged on the conveyor before the rubber strip on the rear side in the strip feeding direction. Since the member does not come into contact with the rubber strip on the rear side, it is possible to more effectively prevent the unintended adhesion between the cut surfaces.

Here, the strip raising means includes a back surface pressing plate facing one of the front surface pressing members, a support portion for supporting the back surface pressing plate from the lower side, and a back surface pressing portion facing the other front surface pressing member. And an elastic body interposed between the back surface pressing plate and the support portion, by interposing an elastic body such as a coil spring between the back surface pressing plate and the support portion, The rubber strip in the upward displacement posture by the strip lifting means is sandwiched between one surface pressing member and the back surface pressing plate from the beginning when the movable cutter is pierced to effectively prevent displacement of the rubber strip. When the elastic body is further compressed by further upward displacement, each of the pair of front surface pressing members and each of the back surface pressing plate and the back surface pressing portion A, it is possible to firmly pinching fixing the rubber strip, during the cutting of the rubber strip by the movable cutter, it is possible to effectively prevent displacement of the rubber strip.
Further, in this case, based on the elastic deformation of the elastic body interposed between the back surface pressing plate and the support portion, it is possible to realize a strong and reliable pinching and fixing state regardless of variations in the thickness of the rubber strip to be pinched. it can.

In particular, when the back surface pressing plate is disposed on the front side in the feeding direction of the rubber strip with respect to the back surface pressing portion of the elevating member with the movable cutter interposed therebetween, the cut surfaces are bonded to each other after cutting the rubber strip. The rubber strip can be cut sufficiently and properly by the movable cutter while effectively preventing the above.
That is, in order to effectively prevent the adhesion of the cut surface, as described above, the pair of surface pressing members located on the front side in the strip feeding direction are placed close to the rubber strip surface. In this case, the back surface pressing plate is disposed on the rear side in the strip feeding direction with respect to the back surface pressing portion of the elevating member, and the rubber strip is securely disposed between the front surface pressing members. When the back surface pressing plate is positioned higher than the back surface pressing portion so as to be sandwiched and fixed, the movable cutter is inclined to the rubber strip in a posture inclined from the direction perpendicular to the surface of the rubber strip when the strip lifting means is displaced upward. The rubber strip cannot be cut at the desired position and the length of the strip member will vary. There are, also, there is a possibility that the movable cutter is damaged.

By the way, in a movable cutter having a single blade portion that is displaced from one side edge side of the rubber strip toward the other side edge side and cuts the rubber strip, the surface presser is used to reliably cut the rubber strip. The structure is such that only one side edge part of the rubber strip is sandwiched between the members, but in this case, every time it is used for cutting a rubber strip having a different strip width or inclination angle of the cord embedded therein, it is cut by a movable cutter. It is necessary to adjust the angle and the arrangement position of the surface pressing member.
On the other hand, the movable cutter is spaced apart from the posture pierced in the intermediate region in the width direction of the rubber strip, and the rubber strip is cut from the intermediate region toward each side edge of the rubber strip. When having a blade portion, for example, without changing the arrangement position of the surface pressing member arranged in the middle region of the rubber strip, according to the rubber strip of various strip widths and cord inclination angle, By changing only the cutting angle of the movable cutter, the rubber strip can be cut with high accuracy.

The contact surface of the one surface pressing member arranged close to the surface of the rubber strip is 2.0 mm to 6.0 mm lower than the similar contact surface of the other surface pressing member. When the rubber strip is positioned, it prevents the mutual contact between the cut surfaces after cutting the rubber strip more effectively, and clamps and fixes between the pair of surface pressing members and the strip lifting means. It is possible to prevent the deterioration of the properties of the rubber strip due to the above.
That is, when the difference in height between the contact surfaces of the pair of surface pressing members is less than 2.0 mm, the cut surface of the rubber strip and the cut surface of the strip member after cutting are cut off. Since they are located close to each other, there is a possibility that the contact of the cut surfaces cannot be effectively prevented. On the other hand, the difference in height between the contact surfaces exceeds 6.0 mm. In this case, the sandwiching and fixing position of the rubber strip is largely separated in the height direction between the one surface pressing member and the other surface pressing member. There is a concern that the rubber strip sandwiched and fixed between the means may be greatly deformed.

  By the way, operation of the strip raising means is performed at a position adjacent to the front side or the rear side in the feeding direction of the rubber strip of the other surface pressing member arranged apart from the rubber strip surface among the pair of surface pressing members. When the suction holding means for sucking and fixing the rubber strip lifted and displaced by is cut by the movable cutter, the rubber strip is released from the pinched and fixed state, and then, based on the suction fixing by the suction holding means, Since the rising displacement posture of either the rubber strip or the strip member can be maintained, it is possible to sufficiently prevent the cutting surface of the rubber strip and the cutting surface of the strip member from approaching. The possibility of surface adhesion can be more reliably removed.

  Here, the adsorption holding means includes a magnet member that magnetically adsorbs a rubber strip in which a steel cord is embedded, and an adsorption release sleeve that accommodates the magnet member therein and moves the magnet member forward and backward with respect to the rubber strip. When configured as described above, it is possible to perform the above-described adsorption fixation of the rubber strip and the release of the adsorption fixation state by the adsorption holding means under a simple structure as compared with the case of negative pressure suction.

  According to the rubber strip cutting method of the present invention, the respective rubber strip portions located on the front side and the rear side in the feeding direction with the movable cutter being separated from the front side and the back side of the rubber strip, As described above, the cut surface after cutting the rubber strip by cutting the rubber strip by sandwiching and fixing at different heights and displacing the movable cutter in the width direction of the rubber strip. Can be effectively prevented from adhering to each other.

It is a front view which shows one Embodiment of the cutting device of this invention in the state which has arrange | positioned the rubber strip on the conveyor. It is a perspective view which expands and shows the principal part of the apparatus of FIG. It is a schematic diagram which shows the cutting process of a rubber strip using the apparatus of FIG. FIG. 4 is a schematic diagram showing a step following FIG. 3. It is a schematic diagram which shows the cutting process of the rubber strip by the conventional cutting device.

Embodiments of the present invention will be described below with reference to the drawings.
The cutting apparatus illustrated in FIG. 1 is directed to the surface side of an unvulcanized rubber strip 30 that is intermittently fed over a predetermined length, for example, on the conveyor 20 in one direction, that is, on the right side in the figure (see FIG. The movable cutter 1 disposed on the upper surface side and displaceable in the width direction of the rubber strip 30 for cutting the rubber strip 30 is separated from the movable cutter 1 on the surface side of the rubber strip 30. The pair of surface pressing members 2 and 3 provided on the front side and the rear side in the strip feeding direction and the back surface side (the lower surface side in the figure) of the rubber strip 30 are arranged so that the rubber strip 30 is movable. Strip raising means 4 for raising and moving the cutter 1 and the surface pressing members 2 and 3 directly below the movable cutter 1 is provided.

Here, the strip raising means 4 raises and displaces the rubber strip 30 based on its own upward displacement, and the respective rubber strip portions located on the front side and the rear side in the strip feeding direction with the movable cutter 1 therebetween. Is sandwiched and fixed between each of the pair of surface pressing members 2 and 3.
Note that, under the sandwiched and fixed state of the rubber strip 30 caused by such an operation of the strip raising means 4, the movable cutter 1 is stuck into a predetermined position of the rubber strip 30.

And here, the strip raising means 4 is, for example, a back surface pressing plate 5 positioned facing the front surface pressing member 2 on the right side of the figure, a support portion 6a for supporting the back surface pressing plate 5 from below, and in the figure. An elevating member 6 having a back surface pressing portion 6b positioned facing the left surface pressing member 3, an elastic body such as a coil spring 7 and an elevating member 6 interposed between the back surface pressing plate 5 and the support portion 6a. And a drive source (not shown) that moves up and down.
Although not shown in the figure, the strip raising means has a back pressure plate disposed on the rear side in the strip feeding direction across the movable cutter, and a back surface pressing portion disposed on the front side in the feeding direction. It can also be.

  Here, in the present invention, as shown in FIG. 1, for example, on the front side in the strip feeding direction, in order to prevent unintended adhesion of the cut surfaces to each other after the rubber strip 30 is cut by the movable cutter 1. The front surface pressing member 2 is disposed closer to the rubber strip surface than the front surface pressing member 3 positioned on the rear side with respect to the rubber strip 30 in the feeding posture shown in the drawing. 2 and the strip fixing means 4 are set so that the pinching fixing position of the rubber strip 30 is lower than the pinching fixing position of the rear surface pressing member 3.

According to this, when the rubber strip 30 is cut using the illustrated cutting apparatus, the surface holding members 2 and 3 having different heights and the strip raising means 4 are sandwiched and fixed. After the rubber strip 30 is cut by the movable cutter 1, the cut surfaces are spaced apart from each other in the height direction, so that the cut surfaces by the inherent adhesive force of the unvulcanized rubber. Can be effectively prevented.
Note that the surface pressing member positioned on the rear side in the strip feeding direction can be disposed closer to the surface of the rubber strip than the surface pressing member positioned on the front side in the feeding direction.

  Here, in order to sufficiently separate the cut surfaces after the rubber strip is cut by the movable cutter 1, the surface pressing member 2 disposed close to the rubber strip 30 in the feeding posture is contacted with the contact surface 2 a to the rubber strip 30. The height difference H with respect to the contact surface 3a of the surface pressing member 3 arranged separately from the rubber strip 30 is preferably in the range of 2.0 mm to 6.0 mm.

  In the place shown in FIG. 1, the rubber strip which has been displaced upwardly by the strip lifting means 4 further on the rear side of the surface pressing member 3 positioned on the rear side in the strip feeding direction and adjacent to the surface pressing member 3. An adsorbing and holding means 8 for adsorbing and fixing 30 is provided. Here, the adsorbing and holding means 8 includes, for example, a magnet member 9 for magnetically adsorbing a rubber strip 30 in which a steel cord is embedded, and an internal magnet member. 9, and the magnet member 9 is constituted by an adsorption release sleeve 10 that moves forward and backward with respect to the rubber strip 30.

  After the strip raising means 4 is lowered to release the sandwiched and fixed state of the rubber strip 30 cut by the movable cutter 1 by the suction holding means 8, the cut rubber strip located on the rear side in the drawing is removed. Since it can be held at the height of the pinching and fixing position, it is possible to sufficiently prevent the rubber strip cut surfaces from approaching each other after cutting, and to more effectively suppress adhesion of the cut surfaces. .

  The surface of the rubber strip 30 is sucked with a negative pressure, although the illustration is omitted together with or in place of the suction holding means 8 of the magnetic suction type comprising the magnet member 9 and the suction release sleeve 10. Thus, negative pressure suction type suction holding means for sucking and fixing the rubber strip 30 can be provided.

Incidentally, the movable cutter 1 used for cutting the rubber strip 30 preferably has a pair of blade portions 1a and 1b as shown in a perspective view in FIG.
Each of the illustrated blade portions 1a and 1b is stuck in the intermediate region in the width direction of the rubber strip 30 lifted by the strip raising means 4 in a mutually overlapping posture, and in this state, is separated from the intermediate region. Thus, as indicated by arrows in the figure, the rubber strip 30 functions to be cut by being displaced toward each of the side edges of the rubber strip 30.

When the rubber strip 30 is cut using the apparatus described above, the rubber strip 30 is fed intermittently over a predetermined length in one direction on a conveyor, for example. As shown in FIG. 3 (a), it is stopped at a predetermined position.
Next, the strip raising means 4 is operated to raise and displace the rubber strip 30, and as shown in FIG. 3B, the rubber strip 30 is moved to the front surface pressing member 2 in the strip feeding direction and the strip raising portion. Further, the rubber strip 30 is lifted and displaced so as to sandwich the rubber strip 30 with the surface pressing member 3 on the rear side in the strip feeding direction as shown in FIG. However, the rubber strip 30 is sandwiched and fixed between each of the pair of surface pressing members 2, 3 and the strip raising means 4.
Here, the movable cutter 1 positioned between the pair of surface pressing members 2 and 3 is inserted into the rubber strip 30 in the upward displacement posture, for example, in an intermediate region in the width direction thereof.

At this time, in the illustrated apparatus, the front surface pressing member 2 in the strip feeding direction is disposed closer to the rubber strip surface than the rear surface pressing member 3 with respect to the rubber strip 30 in the feeding posture. As a result, the rubber strip 30 is exaggerated and shown in FIG. 3C in a posture in which the coil spring 7 between the back surface pressing plate 5 and the support portion 6a of the strip raising means 4 is compressed. The movable cutter 1 is sandwiched and fixed at mutually different heights on the front side and the rear side in the strip feeding direction.
Further, here, the rubber strip 30 in which the steel cord is embedded by the magnet member 9 of the suction holding means 8 arranged adjacent to the surface pressing member 3 is displaced toward the rubber strip 30 inside the suction release sleeve 10. The part on the rear side in the feeding direction is fixed by suction.

  In this state, the movable cutter 1 is operated, for example, by displacing the pair of blade portions 1a and 1b pierced in the intermediate region in the width direction of the rubber strip 30 toward the side edge side of the rubber strip 30, etc. As shown in FIG. 3D, when the rubber strip is cut, the strip member 30a on the front side in the strip feeding direction and the rubber strip 30b on the rear side are sandwiched and fixed at different heights. For this reason, the cut surfaces are located apart from each other in the height direction, and thus the mutual adhesion of the cut surfaces can be prevented sufficiently reliably.

After that, the strip raising means 4 is lowered as shown in FIG. 4A to release the sandwiched and fixed state of the rubber strip 30. Here, the strip feeding means magnetically attracted to the magnet member 9 is used. The rubber strip 30b on the rear side in the direction is held at the pinched and fixed position, while the strip member 30a on the front side in the feeding direction is disposed on the conveyor 20.
In this case, as shown in FIG. 4B, the strip member 30a on the conveyor 20 is indicated by an arrow in the figure while the rubber strip 30b on the rear side in the feeding direction is sucked and fixed by the suction holding means 8. Since it is conveyed, the cut surface of the rubber strip 30b and the cut surface of the strip member 30a do not approach each other, so that the risk of adhesion of the cut surface can be reliably removed.

  Thereafter, the magnet member 9 having magnetically attracted to the rubber strip 30b is moved backward with respect to the rubber strip 30b by the attraction release sleeve 10 as shown in FIG. The magnet member 9 is released from being attracted to the rubber strip 30b, the rubber strip 30b is placed on the conveyor 20, and the feeding of the rubber strip 30b is resumed.

DESCRIPTION OF SYMBOLS 1 Movable cutter 1a, 1b Blade part 2, 3 Surface pressing member 2a, 3a Contact surface 4 Strip raising means 5 Back surface pressing plate 6 Lifting member 6a Back surface pressing portion 6b Supporting portion 7 Coil spring 8 Adsorption holding member 9 Magnet member 10 Adsorption Release sleeve 20 Conveyor 30 Rubber strip H Height difference

Claims (9)

Moveable displaceable in the width direction of the rubber strip, disposed on the surface side of the rubber strip that is intermittently fed over a predetermined length in one direction, and used for cutting the rubber strip A pair of surface pressing members provided on the front side and the rear side of the rubber strip in the feeding direction across the movable cutter on the front side of the cutter and the rubber strip, and disposed on the back side of the rubber strip; A rubber strip cutting device comprising strip lifting means for moving the rubber strip toward the movable cutter and the surface pressing member and moving the rubber strip upward just below the movable cutter, and sandwiching and fixing the rubber strip between the respective surface pressing members. Because
Either one of the pair of surface pressing members positioned across the movable cutter is disposed closer to the rubber strip surface than the other surface pressing member with respect to the rubber strip in the feeding posture. A rubber strip cutting device in which the pinching and fixing position of the rubber strip between the tape and the strip raising means is lower than the pinching and fixing position of the other surface pressing member.   2. The rubber according to claim 1, wherein the one surface pressing member arranged close to the surface of the rubber strip is a surface pressing member located on the front side in the feeding direction of the rubber strip of the pair of surface pressing members. Strip cutting device.   The strip raising means includes a back surface pressing plate facing one surface pressing member, a support portion for supporting the back surface pressing plate from below, and a lifting member having a back surface pressing portion facing the other surface pressing member, The rubber strip cutting device according to claim 1 or 2, comprising an elastic body interposed between the back surface pressing plate and the support portion.   The rubber strip cutting device according to claim 3, wherein the back surface pressing plate is disposed on the front side in the feeding direction of the rubber strip with respect to the back surface pressing portion of the elevating member with a movable cutter therebetween.   A pair of blade portions for cutting the rubber strip from the intermediate region toward each side edge of the rubber strip, spaced apart from each other from the posture in which the movable cutter pierces the intermediate region in the width direction of the rubber strip. The rubber strip cutting device according to any one of claims 1 to 4, wherein the rubber strip cutting device is provided.   The contact surface of the one surface pressing member disposed close to the surface of the rubber strip is positioned 2.0 mm to 6.0 mm lower than the similar contact surface of the other surface pressing member. The rubber strip cutting device according to any one of claims 1 to 5.   Based on the operation of the strip raising means, at the position adjacent to the front side or the rear side in the rubber strip feeding direction of the other surface pressing member arranged apart from the rubber strip surface among the pair of surface pressing members. The rubber strip cutting device according to any one of claims 1 to 6, further comprising suction holding means for sucking and fixing the rubber strip in the upward displacement posture. It is used for cutting rubber strips with steel cords embedded inside,
8. The suction holding means comprises a magnet member that magnetically attracts the rubber strip, and a suction release sleeve that houses the magnet member therein and moves the magnet member forward and backward relative to the rubber strip. A rubber strip cutting device according to claim 1. In cutting a rubber strip that is intermittently fed over a predetermined length in one direction into a predetermined length,
In a state where the feeding of the rubber strip is temporarily stopped, the rubber strip is lifted from the back surface side, and the rubber strip is lifted and displaced toward the movable cutter provided on the front surface side thereof,
The rubber strip portions positioned on the front side and the rear side in the feeding direction across the movable cutter are sandwiched and fixed at different heights from the front side and the rear side of the rubber strip, and the movable cutter is fixed. The rubber strip is cut by displacing the rubber strip in the width direction of the rubber strip, and then releasing the sandwiched and fixed state of each rubber strip portion to resume the feeding of the rubber strip. Method.

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