JP5903849B2 - Method and apparatus for cutting adhesive rubber - Google Patents

Description

  The present invention relates to an adhesive rubber cutting method and apparatus capable of efficiently cutting an adhesive rubber and allowing it to be reliably dropped to a predetermined place.

  Conventionally, when a flexible material extruded with a constant cross-sectional shape is continuously cut with a cutter, the cutter is provided so as to extend on a plane perpendicular to the direction in which the flexible material is extruded, and on this plane. A method is known in which the cutter is rotated to move the flexible material continuously.

Japanese Patent Laid-Open No. 48-100811

However, when the object to be cut is an adhesive rubber, this cutting method causes various problems due to the adhesiveness of the rubber.
For example, if the surface where the cutter contacts the extruded rubber is the front surface and the back surface is the back surface, the rubber is moved when the cutter is moved on a plane perpendicular to the direction in which the flexible material is extruded. Since a thread is pulled between the surface of the cutter and the adhesive rubber after cutting, it is disadvantageous in continuously cutting the adhesive rubber.
Further, after the rubber is cut, the cut rubber adheres to the back surface of the cutter because it has adhesiveness. Thus, when the rubber | gum which has adhesiveness adheres to the back surface of a cutter, how to peel off rubber | gum from the back surface of a cutter and collect | recover becomes an important problem. That is, the rubber adhering to the back surface of the cutter every time it is cut is difficult to peel off because it has adhesiveness, and if it is not peeled off properly, the rubber adhering to the back surface of the cutter will be scattered in different directions every time it is cut.

The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide a method for cutting an adhesive rubber that can efficiently and continuously cut the adhesive rubber.
Another object of the present invention is to provide a method and an apparatus for cutting an adhesive rubber that can continuously and efficiently cut the adhesive rubber and that can reliably recover the cut rubber body.

In order to achieve the above object, the adhesive rubber cutting method according to the present invention includes extruding a sticky rubber in a horizontal direction from a die forming hole in a horizontal direction, and a die end surface around the molding hole. A razor blade extending on a vertical plane orthogonal to the axis of the molding hole in a state of facing the molding hole, so that the distance from the die end surface in the horizontal direction is increased after passing through the molding hole. It is rotated around a rotating shaft extending in the horizontal direction on a surface orthogonal to the axis of the molding hole, and is pushed out of the molding hole while bringing the razor blade close to the die end surface around the molding hole. The razor blade is positioned on the opposite surface to the surface facing the die end surface in a state of extending on the vertical surface facing the die end surface around the molding hole. And the molding hole Also provided at the front portion in the rotational direction of the razor blade is provided with a peeling portion arm that is suspended vertically downward by a swing shaft parallel to the rotation shaft and can be swung in a vertical plane around the swing shaft, A support shaft protrudes in parallel to the rotation shaft at the lower end of the peeling portion arm, and has a center hole with an inner diameter larger than the support shaft, and is supported by the support shaft being inserted into the center hole. The front end of the rubber body cut by the razor blade and attached to the back surface is brought into contact with the outer peripheral surface of the ring plate member as the razor blade rotates, and the impact, the outer peripheral surface and the rubber body The rubber body is peeled off from the back surface by the frictional force of the tip, and the rubber is between the razor blade and the razor blade is positioned at a location where the razor blade extends on the vertical surface on the side away from the molding hole. The rubber body is dropped by its own weight .
Further, the adhesive rubber cutting device of the present invention includes a supply unit that extrudes adhesive rubber in a horizontal direction from a die forming hole in a horizontal direction, and a rubber extruded from the forming hole. A cutting part that is cut to a predetermined length by a razor blade, a peeling part that is cut by the razor blade and is attached to the razor blade by the adhesiveness of the rubber, and the peeling part removes the rubber body from the razor blade. A recovery part for recovering the rubber body peeled off from the razor blade, and the cutting part rotates around a rotation axis extending in a horizontal direction through a location on the extension of the axis of the molding hole. The razor blade is attached to the tip of the cutting portion arm, and the cutting hole arm extends in a horizontal direction toward the forming hole. The forming hole extending on a vertical plane perpendicular to the center The razor blade has a surface opposite to the peripheral die end surface and a reverse surface located on the opposite side, and the razor blade is in close proximity to the peripheral die end surface of the molding hole as the cutting portion arm rotates. The rubber extruded from the molding hole is cut, and the peeling part is suspended vertically by a swinging shaft parallel to the rotation shaft, and can be moved in a vertical plane around the swinging axis. An arm, a support shaft projecting parallel to the rotation shaft at a lower end of the peeling portion arm, a center hole having an inner diameter larger than the support shaft, and an outer peripheral surface, and the support shaft is disposed in the center hole. The rubber body is supported by being inserted and cut by the razor blade and can be brought into contact with the front portion of the rubber body attached to the back surface of the razor blade, and the rubber body is peeled off from the back surface by contacting the front portion of the rubber body. An annular plate member, and the recovery part is separated from the cutting part It provided with downwardly, characterized in that is provided to be housed a rubber body to fall from the back of the razor blade.

According to the adhesive rubber cutting method and apparatus of the present invention, the razor blade moves away from the end face of the die so that the distance from the end face of the die in the horizontal direction increases after cutting the rubber. Pulling the thread between the razor blade and the rubber in the molding hole is prevented. Therefore, it becomes possible to continuously cut the sticky rubber in a stable state.
Further, according to the adhesive rubber cutting device of the present invention, the base of the rubber body is reliably peeled off from the back surface of the razor blade by the impact received from the ring plate member and the frictional force received from the ring plate member. There is no variation with the rotation of the arm, and it falls reliably at its predetermined location due to its own weight.
Therefore, the cut rubber body having adhesiveness can be reliably recovered, and it is advantageous for efficiently transporting to the next step and molding the rubber body efficiently.

It is the figure which showed the state before this which cut | disconnects rubber | gum with a razor blade with the front view of a cutting device. It is the figure which showed the state which cut | disconnected rubber | gum with the razor blade with the front view of the cutting device. It is the front view of a cutting device, and is the figure which showed the state which the front part of the rubber body attached to the back surface of a razor blade contact | abutted to the annular plate member. It is the front view of a cutting device, and is the figure which showed the state by which the rubber body attached to the back surface of the razor blade was peeled off by the ring-plate member. It is the front view of a cutting device, and is the figure which showed the state by which the rubber body attached to the back surface of the razor blade was peeled off by the ring-plate member. It is the front view of a cutting device, and is the figure which showed the state by which the rubber body attached to the back surface of the razor blade was peeled off by the ring-plate member. It is the front view of a cutting device, and the figure which showed the state which the rubber body fell from the back surface of the razor blade with dead weight. It is the front view of a cutting device, and the figure which showed the state in which the rubber body which fell from the back surface of the razor blade was collect | recovered. FIG. 3 is a view as seen from an arrow A in FIG. It is A arrow directional view of FIG. It is A arrow directional view of FIG.

Hereinafter, the cutting method of the adhesive rubber of this invention is demonstrated according to drawing with a cutting device.
The adhesive rubber cutting device 10 includes a supply unit 12, a cutting unit 14, a peeling unit 16, and a recovery unit 18.

In the supply unit 12, for example, the adhesive rubber 20 that is discharge-molded by an extruder is extruded from the forming hole of the die 22 in a constant cross-sectional shape in the horizontal direction.
The axis CL1 of the molding hole extends in the horizontal direction, the die end surface 2202 around the molding hole extends on the vertical surface, and the rubber 20 having a circular cross section is extruded from the molding hole.

The cutting part 14 cuts the rubber 20 extruded from the molding hole into a predetermined length.
The cutting unit 14 includes a cutting unit arm 24, a razor blade 26, and a rotation drive mechanism 30 for the cutting unit arm 24.
As shown in FIG. 1, the cutting portion arm 24 is vertically centered on a hollow rotating shaft 28 that extends in a horizontal direction perpendicular to the axis CL1 through a portion on the extension of the axis CL1 of the forming hole. It is provided so as to rotate on the surface, and in FIGS. 9 to 11, reference numeral CL <b> 2 indicates the axis of the rotation shaft 28.
The razor blade 26 cuts the rubber 20 extruded from the molding hole while approaching the die end surface 2202 around the molding hole as the cutting portion arm 24 rotates.
As shown in FIG. 9, the razor blade 26 is attached to the tip of the cutting portion arm 24 via a screw N1.
The razor blade 26 has a uniform thickness of 0.1 mm to 0.5 mm, and the blade portion is formed so as to gradually become thinner toward the tip.
The razor blade 26 has a front surface 26A positioned on the molding hole side and a back surface 26B in a state where the tip of the cutting section arm 24 is positioned on the molding hole side and the cutting section arm 24 extends in the horizontal direction. Is provided on the rotary shaft 28 side so as to extend on the vertical plane.
As shown in FIGS. 9 to 11, the rotary drive mechanism 30 of the cutting portion arm 24 is attached to the hollow rotary shaft 28, a bearing 3002 that rotatably supports the rotary shaft 28, and the rotary shaft 28. A gear 3004, a gear mechanism (not shown) that meshes with the gear 3004, and a motor (not shown) that rotationally drives the gear mechanism are provided, and the rotation speed of the motor is controlled by the control unit. 9 to 11, reference numerals 3010 and 3012 denote support walls.
The rubber 20 extruded in a cylindrical shape from the molding hole is cut by a razor blade 26 with a predetermined length, and the cut cylindrical rubber 20 with the predetermined length is called a rubber body 20A.

The peeling part 16 peels off the rubber body 20A attached to the back surface 26B of the razor blade 26 by the adhesiveness of the rubber 20 after being cut by the razor blade 26 from the razor blade 26.
The peeling portion 16 includes a peeling portion arm 32, a support shaft 34, and an annular plate member 36.
As shown in FIGS. 9 to 11, the peeling portion arm 32 is swingably supported by a swing shaft 38 coaxial with the rotary shaft 28 of the cutting portion arm 24, and the swing shaft 38 is supported by the rotary shaft 28. The rotary shaft 38 and the rotary shaft 28 are coaxially positioned. The swing shaft 38 and the rotary shaft 28 are coaxially positioned.
The peeling portion arm 32 is suspended vertically downward by its own weight, and can swing within a vertical plane about the swing shaft 38.
The support shaft 34 projects from the lower end of the peeling portion arm 32 in parallel with the rotation shaft 28 of the cutting portion arm 24.
The ring plate member 36 is disposed at a position where it can be abutted against the front portion of the rubber body 20A, which is cut by the razor blade 26 and attached to the back surface 26B of the razor blade 26. The rubber body 20A is peeled off from the back surface 26B of the razor blade 26 by the frictional force.
The ring plate member 36 has a center hole 3602 having an inner diameter larger than that of the support shaft 34 and an outer peripheral surface 3604 centered on the center hole 3602, and is supported by the support shaft 34 being inserted into the center hole 3602. .
As shown in FIGS. 3 to 6, the outer peripheral surface 3604 of the ring plate member 36 can contact the tip of the rubber body 20 </ b> A attached to the back surface 26 </ b> B of the razor blade 26, and the tip of the rubber body 20 </ b> A is the outer peripheral surface. The ring plate member 36 is moved in the radial direction of the support shaft 34 in contact with 3604, and the support shaft 34 is in contact with the inner peripheral surface of the center hole 3602 and is in contact with the tip of the rubber body 20A. ing.
As shown in FIGS. 9 to 11, the annular plate member 36 is provided in a plurality with a thickness smaller than the diameter of the rubber body 20 </ b> A, and is disposed on the support shaft 34 so as to overlap each other. 34 is movable in the radial direction, and of course, can be rotated around the support shaft 34.

The collection unit 18 collects the rubber body 20 </ b> A peeled off from the razor blade 26 by the peeling unit 16.
The collection unit 18 is provided below the supply unit 12, the cutting unit 14, and the peeling unit 16, and a guide plate 40 that guides the rubber body 20 </ b> A falling from the back surface 26 </ b> B of the razor blade 26 in an obliquely downward direction, and the guide plate 40. The conveyor belt 42 is provided below the conveyor belt 42 and the like.

Next, the operation of the cutting device 10 will be described.
The adhesive rubber 20 discharged and molded by the extruder is extruded in a cylindrical shape from the molding hole of the die 22 in the horizontal direction.
Then, the rotational speed of the cutting portion arm 24 is adjusted in accordance with the speed at which the rubber 20 is pushed out so that the rubber 20 to be cut has a predetermined length, and the cutting portion arm 24 is moved around the rotation shaft 28. Rotate in a vertical plane.

The razor blade 26 is also rotated by the rotation of the cutting portion arm 24, and the rubber 20 pushed out from the molding hole is cut while the razor blade 26 is brought close to the die end surface 2202 around the molding hole. In the present invention, the approach of bringing the razor blade 26 close to the die end surface 2202 around the molding hole includes bringing the razor blade 26 into contact with the die end surface 2202 around the molding hole.
The cut rubber body 20A adheres to the back surface 26B of the razor blade 26 due to the adhesiveness of the rubber 20.
When the cutting portion arm 24 rotates with the rubber body 20A attached to the back surface 26B of the razor blade 26, as shown in FIG. 3, the cutting portion arm 24 is in a state before it extends along the vertical direction. The front part of the rubber body 20 </ b> A comes into contact with the outer peripheral surfaces 3604 of the plurality of ring plate members 36.

When the front portion of the rubber 20 comes into contact with the outer peripheral surfaces 3604 of the plurality of ring plate members 36, the ring plate member 36 moves in the radial direction of the support shaft 34, and a gap between the support shaft 34 and the center hole 3602 becomes A location on the inner peripheral surface of the center hole 3602 located on the opposite side of the rubber body 20A and located on the front side of the rubber body 20A collides with the support shaft 34.
The impact at that time is transmitted to the rubber body 20 </ b> A, and the base portion of the rubber body 20 </ b> A on the front side in the rotational direction of the cutting portion arm 24 is peeled off from the back surface 26 </ b> B of the razor blade 26.
On the other hand, the part of the inner peripheral surface of the center hole 3602 of the annular plate member 36 located on the front side of the rubber body 20A collides with the support shaft 34, and at the same time, the peeling portion arm 32 swings by the front part of the rubber body 20A. Is done.

Since the front portion of the rubber body 20A is in contact with the outer peripheral surfaces 3604 of the plurality of ring plate members 36, the plurality of ring plate members are rotated while the peeling portion arm 32 is rotated in accordance with the rotation of the cutting portion arm 24. The base of the rubber body 20 </ b> A is peeled off from the back surface 26 </ b> B of the razor blade 26 by friction with the outer peripheral surface 3604 of 36 and rotates together with the razor blade 26.
As shown in FIGS. 5, 6, and 7, the rubber body 20 </ b> A is inserted into the razor blade 26 until the cutting portion arm 24 swings from the vertically extending state to the horizontally extending state. Is peeled off from the back surface 26B and falls downward due to its own weight.
The dropped rubber body 20A is guided by the guide plate 40, falls on the transport belt 42, and is transported to the next process by the transport belt 42.
By the rotation of the cutting portion arm 24, the above-described operations of cutting the rubber body 20A, peeling, dropping, and conveying the rubber body 20A are continuously repeated.

According to the present embodiment, the razor blade 26 rotates about the rotating shaft 28 that extends in the horizontal direction perpendicular to the axis CL1 through the location on the extension of the axis CL1 of the forming hole. After cutting the rubber 20, the razor blade 26 moves away from the end surface of the die 22 so that the distance from the die end surface 2202 in the horizontal direction increases, and accordingly, the razor blade 26 and the molding hole are moved. It is possible to prevent the thread from being pulled with the rubber 20 inside.
Therefore, it becomes possible to cut | disconnect the rubber | gum 20 which has adhesiveness continuously in the stable state.

Further, the rubber body 20 </ b> A attached to the back surface 26 </ b> B of the razor blade 26 comes in contact with the outer peripheral surface 3604 of the ring plate member 36 and rotates while being in contact with the ring plate member 36. Due to the impact and the frictional force received from the ring plate member 36, the base portion of the rubber body 20A is surely peeled off from the back surface 26B of the razor blade 26, and does not vary with the rotation of the cutting portion arm 24. It falls reliably due to its own weight.
Therefore, the cut rubber body 20A having adhesiveness can be reliably recovered, and it is advantageous for efficiently transporting to the next step and molding the rubber body 20A efficiently.

Further, since the front portion of the rubber body 20A is not the flat surface but the rubber 20, it has a gentle uneven shape.
In the present embodiment, a plurality of the annular plate members 36 are provided with a thickness smaller than the diameter of the rubber body 20A and overlapped, so that the rubber body 20A is brought into contact with the annular plate member 36 when the front portion of the rubber body 20A contacts. A plurality of ring plate members 36 move separately in the radial direction of the support shaft 34 in accordance with the unevenness of the tip portion.
Accordingly, the impact of the rubber body 20 when the front portion of the rubber 20 abuts against the plurality of annular plate members 36 and the location of the inner peripheral surface of the center hole 3602 located on the front portion side of the rubber body 20A collides with the support shaft 34. This can be distributed over the entire region of the tip portion of 20A, which is advantageous in reliably peeling the base portion of the rubber body 20A on the front side in the rotational direction of the cutting portion arm 24 from the back surface 26B of the razor blade 26.

  Further, if the swing shaft 38 is provided coaxially with the rotation shaft 28 as in the embodiment, it is not necessary to secure a space for disposing the swing shaft 38 separately from the space of the rotation shaft 28, and the cutting device This is advantageous in achieving 10 compactness.

  DESCRIPTION OF SYMBOLS 10 ... Cutting device, 12 ... Supply part, 14 ... Cutting part, 16 ... Stripping part, 18 ... Recovery part, 20 ... Rubber, 20A ... Rubber body, 22 ... Dies, 2202 ... Dies End face, 24... Cutting part arm, 26... Razor blade, 26 A... Razor blade surface, 26 B .. razor blade back surface, 32 .. peeling part arm 32, 34. Ring plate member, 3602 ... center hole, 3604 ... outer peripheral surface, 38 ... swing shaft, 40 ... guide plate, 42 ... transport belt, CL1 ... axis of molding hole, CL2 ... rotation axis Axis of

Claims (7)

Extrude rubber with adhesive in a certain cross-sectional shape in the horizontal direction from the die forming hole,
A razor blade extending on a vertical plane perpendicular to the axis of the molding hole in a state of being opposed to the die end surface around the molding hole, from the die end surface in the horizontal direction after passing through the molding hole. The razor blade is moved close to the die end surface around the molding hole by rotating about a rotation axis extending in a horizontal direction on a plane orthogonal to the axis of the molding hole so that the distance of the molding hole is increased. While cutting the rubber extruded from the molding hole ,
The razor blade has a surface facing the die end surface and a back surface located on the opposite side thereof, in a state of facing the die end surface around the forming hole and extending on the vertical surface.
A peeling portion that is suspended vertically below a rocking shaft parallel to the rotation shaft at a position ahead of the shaping hole in the rotation direction of the razor blade and can be swung in a vertical plane around the rocking shaft. For arm,
A support shaft protrudes in parallel to the rotation axis at the lower end of the peeling portion arm,
A rubber body having a center hole with an inner diameter larger than that of the support shaft and cut by the razor blade on the outer peripheral surface of the annular plate member supported by the support shaft being inserted through the center hole. The tip of the razor blade is brought into contact with the rotation of the razor blade, the rubber body is peeled off from the back surface by the impact and the frictional force of the outer peripheral surface and the tip of the rubber body,
The rubber body is dropped by its own weight while the razor blade rotates and is positioned at a position where the razor blade extends on the vertical surface on the side away from the molding hole,
A method for cutting adhesive rubber, characterized in that: The razor blade is attached to the tip of a cutting arm that rotates in a vertical plane around a rotation axis that extends in a horizontal direction perpendicular to the axis of the molding hole,
The razor blade is rotated by rotating the cutting portion arm.
The method for cutting an adhesive rubber according to claim 1 . The outer peripheral surface of the annular plate member can contact the tip of the rubber body attached to the back surface of the razor blade, and the annular plate member can be in contact with the outer peripheral surface by contacting the distal end of the rubber body. In a state where the inner peripheral surface of the central hole is moved in the radial direction of the support shaft and is in contact with the support shaft, it is formed with a size in contact with the tip of the rubber body.
The method for cutting an adhesive rubber according to claim 1 or 2, wherein the adhesive rubber is cut. A supply unit for extruding rubber having adhesiveness in a certain cross-sectional shape in a horizontal direction from a die forming hole;
A cutting portion for cutting the rubber extruded from the molding hole into a predetermined length with a razor blade;
A peeling portion for peeling off the rubber body attached to the razor blade by the adhesiveness of the rubber cut by the razor blade;
A recovery unit for recovering the rubber body peeled off from the razor blade by the peeling unit;
The cutting portion includes a cutting portion arm that rotates about a rotation axis that extends in a horizontal direction through a location on an extension of the axis of the molding hole,
The razor blade is attached to a tip portion of the cutting portion arm, and a vertical plane perpendicular to the axis of the forming hole in a state where the cutting portion arm extends in a horizontal direction toward the forming hole. A surface extending above and facing the die end surface around the molding hole, and a back surface located on the opposite side thereof,
The razor blade cuts the rubber extruded from the molding hole while approaching the die end surface around the molding hole as the cutting portion arm rotates.
The peeling portion is suspended vertically downward by a swinging shaft parallel to the rotation axis and can swing in a vertical plane about the swinging shaft, and the peeling portion arm is provided at the lower end of the peeling portion arm. A support shaft projecting in parallel with the rotation shaft, a center hole having an inner diameter larger than the support shaft, and an outer peripheral surface, and supported by the support shaft being inserted through the center hole and cut by the razor blade. And an annular plate member that can come into contact with the front portion of the rubber body attached to the back surface of the razor blade and peels the rubber body from the back surface by contacting the front portion of the rubber body,
The recovery part is provided below the cutting part and the peeling part, and is provided so as to accommodate a rubber body falling from the back surface of the razor blade.
A sticky rubber cutting device. The rubber body has a circular cross section,
A plurality of the annular plate members are provided with a thickness smaller than the diameter of the rubber body, and are arranged to overlap each other so as to be movable in the radial direction of the support shaft.
The adhesive rubber cutting device according to claim 4 . The swing shaft is provided coaxially with the rotation shaft.
The adhesive rubber cutting device according to claim 4 or 5 , characterized in that The outer peripheral surface of the ring plate member can contact the tip of the rubber body attached to the back surface of the razor blade, and the ring plate member is brought into contact with the ring plate member by contacting the tip of the rubber body. The outer peripheral surface of the ring plate member is formed in a size in contact with the tip of the rubber body in a state where the inner peripheral surface of the center hole is moved in the radial direction of the support shaft and is in contact with the support shaft.
The adhesive rubber cutting device according to any one of claims 4 to 6 , wherein the adhesive rubber is cut.

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