JP2019136787A - Endless rubber elastic body, and manufacturing method of the same - Google Patents

Abstract

To provide an endless rubber elastic body which is excellent in width accuracy, and a manufacturing method which is excellent in the width accuracy and durability of a device component.SOLUTION: A manufacturing method of an endless rubber elastic body includes: a holding process of making a core material 13 hold a hose-like elastic body 12; and a cutting process of cutting the hose-like elastic body 12 by bringing a blade edge 14 close to a direction orthogonal to an outer peripheral surface of the hose-like elastic body 12 while rotating the held hose-like elastic body 12. The holding process includes a process of inserting the hose-like elastic body 12 from one end side of the core material 13 in an axial direction in a state that air is sent to an air introduction hole of the core material 13 and the air is blown out from a plurality of vent holes formed on an outer peripheral surface of the core material. The cutting process is a process of cutting the hose-like elastic body 12 by moving the blade edge 14 to a position close to the outer peripheral surface of the hose-like elastic body 12 at a first speed and moving from the close position at a second speed lower than the first speed.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an endless rubber elastic body and a method for manufacturing the same, and more particularly to a method for manufacturing an apron belt used in a draft device of a spinning machine.

  For example, a draft device of a spinning machine is provided with a plurality of roller pairs including a bottom roller and a top roller. An apron belt, which is an endless rubber elastic body, is bridged between the bottom rollers and between the top rollers. And a fiber bundle is drafted because a roller pair and an apron belt pair rotate in the advancing direction of a fiber bundle (patent document 1). The fiber bundle passing through the apron belt pair is drafted by the gripping force of the apron belt, and is drawn to a fiber bundle having a predetermined thickness. Since the apron belt is a rubber product, it wears due to friction and is replaced with a new one after a certain period of use.

  Conventionally, an apron belt is manufactured by cutting a hose-like rubber elastic body (hereinafter referred to as a hose-like elastic body) at predetermined lengths using a cutting device. A conventional method for manufacturing an apron belt will be described with reference to FIG. This manufacturing method includes a holding step of holding a hose-like elastic body and a cutting step of cutting the held hose-like elastic body with a blade blade. A cutting device 31 shown in FIG. 7A includes a mandle 33 that holds the hose-like elastic body 32, a blade blade 34 that cuts the hose-like elastic body 32, and a rotating device 35 that rotates the mandle 33. The mandle 33 is a member in which a cylindrical member is divided into a plurality in the circumferential direction, and has a plurality of movable portions 33a. Each movable portion 33a can move along the radial direction (in the direction of the arrow in the figure), and the outer diameter dimension of the mandrel 33 changes as these move together.

  In the conventional method, in the holding step, first, each movable portion 33a is moved in advance so that the outer diameter of the mandrel 33 is smaller than the inner diameter of the hose-like elastic body 32. Then, after the hose-like elastic body 32 is inserted into the mandrel 33, each movable part 33 a is moved radially outward to bring the mandrel 33 into close contact with the hose-like elastic body 32. As a result, the hose-like elastic body 32 is held by the mandle 33.

  In the subsequent cutting step, the mandrel 33 and the hose-like elastic body 32 are rotated by the rotating device 35. In this rotating state, the blade blade 34 is moved in a direction orthogonal to the outer peripheral surface of the mandrel 33 to cut the hose-like elastic body 32, whereby an apron belt having a predetermined width is obtained. The width W of the apron belt (see FIG. 1A) is appropriately set according to the dimensions of the bottom roller and the top roller.

JP 2002-193416 A

  In recent years, high performance has been advanced in spinning machines and other industrial equipment, and high precision design is required for various parts. Since the configuration of the draft device affects the quality of the yarn to be produced, high dimensional accuracy is also required for the width of the apron belt. Regarding the width accuracy of the apron belt, it is considered that there is room for improvement in the conventional method.

  As shown in FIG. 7, in the conventional method, since each movable part 33a of the mandrel 33 is moved in the holding step, the hose-like elastic body 32 may be distorted during holding. And since the hose-like elastic body 32 is cut in a state where distortion is generated, there is a concern that the width of the apron belt may vary.

  Further, in the conventional method, a gap along the mandrel axial direction is generated between the movable parts. FIG. 7B is a cross-sectional view showing a state in which the hose-like elastic body is in close contact with the mandle. In this case, since the hose-like elastic body 32 held by the mandrel 33 partially enters the gap g, the hose-like elastic body 32 is indented radially inward in the gap g. And when cutting with the blade blade 34, it is necessary to press the blade blade 34 against the movable portion 33a in order to cut in consideration of the dent. Therefore, early wear of the blade blade 34 is likely to occur, and the cutting ability is reduced. Further, since the mandrel 33 contacts the blade blade 34, a flaw of a few millimeters is generated on the surface of the mandrel 33. Therefore, the blade blade tip enters the surface flaw at the time of cutting, and the blade blade is not located at the intended location. This leads to a deterioration in cutting accuracy. Further, the cutting at the gap g may cause the tip of the blade blade 34 to shake, and there is a concern that the apron belt width accuracy may be further deteriorated.

  On the other hand, as a method of not using the movable mandrel in the holding step, for example, there is a method of directly fitting a hose-like elastic body into a cylindrical core member. However, since the resistance at the time of insertion is large, the held hose-like elastic body is likely to be distorted. As a result, there is a concern that the width of the apron belt may vary.

  The present invention has been made to cope with such problems, and provides an endless rubber elastic body excellent in width accuracy and a manufacturing method excellent in width accuracy and in durability of apparatus parts. With the goal.

  In the method for producing an endless rubber elastic body of the present invention, a holding step of holding a hose-like elastic body, which is a hose-like rubber elastic body, is rotated on a cylindrical core, and the held hose-like elastic body is rotated. A cutting step in which the cutting blade is moved in a direction orthogonal to the outer peripheral surface of the hose-like elastic body to cut the hose-like elastic body, and the holding step includes the columnar core material. The hose-like elastic body is fed from one axial end side of the cylindrical core member in a state where air is supplied to the air introduction hole and air is blown out from a plurality of vent holes formed on the outer peripheral surface of the cylindrical core member. The cutting step moves the cutting blade to a position close to the outer peripheral surface of the hose-like elastic body at a first speed, and from the close position, the cutting speed is lower than the first speed. Work to cut the hose-like elastic body by moving it at 2 speeds And characterized in that.

  The vent holes are formed in a plurality of rows at equal intervals in the axial direction of the cylindrical core member, and are formed at equal angular intervals in each row with respect to the axis center.

  The vent hole and the cutting blade are arranged so as not to overlap in a direction orthogonal to the outer peripheral surface of the hose-like elastic body.

  The vent hole formed on the one axial end side of the columnar core is formed larger than the hole diameter of the vent hole formed on the other axial end side of the columnar core.

  The endless rubber elastic body includes a plurality of layers, and includes a base material layer and a rubber elastic layer laminated on a radially inner side of the base material layer. In the cutting step, the cutting blade is moved at the second speed. When moving, the tip of the cutting blade is not moved to the outer peripheral surface of the cylindrical core material, but is moved to the rubber elastic layer to cut the hose elastic body.

  The endless rubber elastic body of the present invention is a substantially columnar member in which the outer peripheral surface side is divided by a cut portion and the inner peripheral surface side is connected, and a plurality of the cut portions are provided at predetermined intervals along the axial direction. Each of the endless rubber elastic bodies is formed by being gripped and pulled by a user, and the part can be separated. .

  The manufacturing method of the present invention includes a holding step and a cutting step, and the holding step feeds air to the air introduction hole of the cylindrical core member, and a plurality of vent holes formed on the outer peripheral surface of the core member. Since the hose-like elastic body is inserted from one axial end of the cylindrical core material in the state where air is blown from, the inner diameter of the hose-like elastic body is widened by the air pressure, and the resistance during insertion is reduced. The elastic body can be held without causing distortion in the core material. Further, in the cutting step, the cutting blade is moved at a first speed to a position close to the outer peripheral surface of the hose-like elastic body, and is moved at a second speed slower than the first speed from the close position, so that the hose-like elasticity is obtained. Since the body is cut, it is possible to suppress the blurring of the tip of the cutting blade during cutting, and the cutting blade and the core material are less likely to be damaged.

  The vent holes are formed in a plurality of rows at equal intervals in the axial direction of the cylindrical core material, and are formed at equal angular intervals with respect to the axis center in each row, so that the outer peripheral surface of the cylindrical core material The air is blown out almost evenly and the workability when holding the hose-like elastic body is excellent.

  Since the ventilation hole and the cutting blade are arranged so as not to overlap in the direction orthogonal to the outer peripheral surface of the hose-like elastic body, it is possible to suppress the shake of the tip of the cutting blade during cutting.

  The endless rubber elastic body of the present invention is a substantially columnar member in which the outer peripheral surface side is divided by a cut portion and the inner peripheral surface side is connected, and a plurality of cut portions are formed at predetermined intervals along the axial direction. In addition, each part is formed over the entire circumference in the circumferential direction, and a part of the endless rubber elastic body can be separated by the user by grasping and pulling it. It is easier to transport and maintain its shape when in use than when separated into two. Therefore, distortion when attached to various rollers can be suppressed. In addition, the workability of the user can be improved.

It is a figure which shows the endless rubber elastic body obtained with the manufacturing method of this invention. It is the schematic of the cutting apparatus used for the manufacturing method of this invention. FIG. 3 is a perspective view of a core material of the cutting apparatus of FIG. 2. It is a figure which shows the outline of a movement of a blade blade. It is a figure which shows another form about the movement of a blade blade. It is a figure etc. which show one form of the endless rubber elastic body of this invention. It is the schematic etc. of the cutting apparatus used for the conventional manufacturing method.

  An embodiment of an endless rubber elastic body manufactured by the manufacturing method of the present invention will be described with reference to FIG. FIG. 1A shows a perspective view of an apron belt, and FIG. 1B shows a partially enlarged view of a cross section when the apron belt is cut in the radial direction. As shown in FIG. 1A, the apron belt 1 is an endless rubber elastic body, and is an annular structure of a sheet material. When the apron belt 1 is attached to various rollers, the outer peripheral surface 1a is in contact with the woven yarn, and the inner peripheral surface 1b is in contact with the roller base material. The width W (length in the axial direction) and the thickness L (length from the outer peripheral surface 1a to the inner peripheral surface 1b) of the apron belt 1 are appropriately set depending on the application. For example, the width W of the apron belt is 10 to 100 mm, and the thickness L is 0.5 to 3 mm.

  The apron belt has a plurality of layers, and the apron belt shown in FIG. 1 has a three-layer structure. The apron belt 1 has a structure in which a yarn layer 3 as a base material layer is sandwiched between two rubber elastic layers (an outer layer 2 and an inner layer 4). The thread layer 3 and each rubber elastic layer are joined through an adhesive or the like, for example.

  As a rubber elastic composition constituting the outer layer 2 and the inner layer 4, ethylene-propylene-diene copolymer (EPDM), acrylonitrile butadiene rubber (NBR), polyurethane, butyl rubber, polyvinyl chloride (PVC), etc. are used. Can do. In addition, the outer layer 2 and the inner layer 4 may be comprised with the mutually different composition, and may be comprised with the same composition. Further, the thickness of the outer layer 2 and the thickness of the inner layer 4 may be the same or different.

  The thread layer 3 is a layer formed by spirally winding a thread material on the inner layer 4. Although the space | interval (pitch) between adjacent thread materials is not specifically limited, For example, it forms so that a clearance gap may not arise. As the thread material, natural fibers such as cotton, hemp, and silk, and synthetic fibers such as nylon, polyamide, and polyester can be used.

  A cutting apparatus used for manufacturing the apron belt described above will be described with reference to FIG. As shown in FIG. 2, the cutting device 11 cuts the substantially cylindrical core material 13 that holds the hose-like elastic body 12, the air supply device 16 that pumps air to the core material 13, and the hose-like elastic body 12. A blade blade 14 that rotates, and a rotating device 15 that rotates the core member 13.

  The configuration of the core material will be described with reference to FIG. The core member 13 includes an air introduction hole 13a formed along the axial direction in the center of the circle, and a plurality of vent holes 13b formed in the outer peripheral surface of the core member 13 and communicated with the air introduction hole 13a. The air introduction hole 13a is formed by closing one end side in the axial direction and opening the other end side, and an air supply device is connected to the opened side. In the core member 13, the air holes 13 b are formed in a plurality of rows (three rows in FIG. 3A) at equal intervals in the axial direction of the core member 13, and are formed at equal angular intervals with respect to the center of the circle in each row. The As shown in FIG. 3 (b), three vent holes 13b are formed in each row, and their angular interval θ is 120 °. In this case, the air holes in each row overlap each other in the circumferential direction. Note that the air holes in each row may be formed so as not to overlap each other in the circumferential direction. The hole diameter of the vent hole 13b is, for example, 1 mm. In addition to the configuration of FIG. 3, the number of rows of vent holes, the number in each row, the hole diameter, and the like are appropriately set according to the length of the core material and the like.

  The core material is made of a metal material such as steel. The outer diameter of the core material is the same as or slightly larger than the inner diameter of the hose-like elastic body to be held. Thereby, it can hold | maintain firmly to a core material with the contraction force of a hose-like elastic body.

  As shown in FIG. 2, a plurality of blade blades 14 are arranged at predetermined intervals along the axial direction (x-axis direction) of the core member 13. The interval between the blade blades is an interval corresponding to the width W of the apron belt (see FIG. 1). The blade blade 14 can move in a direction orthogonal to the outer peripheral surface of the core member 13 (y-axis direction). In FIG. 2, the blade blade 14 moves in the horizontal direction. At this time, the plurality of blade blades integrally move in the y-axis direction.

  The method for producing an apron belt of the present invention is a method for producing an apron belt using the cutting device. The production method of the present invention includes at least (a) a holding step for holding the hose-like elastic body on the core material, and (b) a cutting step for cutting the held hose-like elastic body. Below, each process is demonstrated.

<Holding process>
In the holding step, first, air is supplied to the air introduction hole 13 a of the core member 13 by the air supply device 16. The supplied air is blown out of the core material through the plurality of air holes 13b. In this state, when the hose-like elastic body 12 is inserted from the end on one axial end side of the core member 13 (the non-connection side of the air supply device 16 in FIG. 2), the hose-like elastic body is blown by the air blown out from the vent hole 13b. The inner diameter of the lens slightly expands radially outward. Thereby, a slight gap is generated between the inner peripheral surface of the hose-like elastic body 12 and the outer peripheral surface of the core member 13, and the hose-like elastic body 12 can be inserted without resistance. Note that the end portion of the core member on the non-connecting side of the air supply device is the end portion on the side where the air introduction hole 13a is not opened in FIG.

  When the air supply is stopped in a state where the hose-like elastic body 12 is inserted into the core material 13, the inner diameter of the hose-like elastic body is reduced, and the air interposed between the inner peripheral surface of the hose-like elastic body 12 and the outer peripheral surface of the core material 13. Extrude to adhere. By the holding step, the hose-like elastic body can be easily inserted, and the hose-like elastic body can be stably held after the insertion. Thereby, a hose-like elastic body can be held without distortion.

  In the core member 13 shown in FIG. 3, all the hole diameters of the air holes are formed to be the same, and the intervals between the rows are equal. This point is not limited to this, and the hole diameter may be different depending on the formation position of the vent hole, and the interval between the rows may be different from each other. In the former case, for example, the hole diameter of the vent hole formed on the side where the hose-like elastic body 12 is inserted can be made larger than the hole diameter of the vent hole formed on the opposite side. Thereby, the resistance at the time of the insertion initial stage of the hose-like elastic body 12 considered to have the largest resistance can be reduced.

<Cutting process>
In the cutting step, first, the held hose elastic body is rotated by the rotating device 15. In this rotation state, the blade blade 14 is moved in the y-axis direction and brought into contact with the hose elastic body, thereby cutting the hose elastic body. “Cutting” in this cutting step includes partially cutting the member of the hose-like elastic body and cutting the member so that the member is completely cut off. The present invention is characterized in that the blade blade 14 is moved and cut at a first speed and then a second speed slower than the first speed with respect to the rotating hose-like elastic body. This point will be described with reference to FIG.

  As shown in FIG. 4, on the y-axis, the blade blade 14 is moved at a first speed V1 to a position P close to the outer peripheral surface of the hose-like elastic body 12. The “close position” is a position where the tip of the blade blade does not contact the outer peripheral surface of the rotating hose-like elastic body and is a close position. 1 to 10 mm, preferably 0.5 to 5 mm, more preferably 0.5 to 3 mm apart. Moreover, you may set this separation distance as ratio with respect to the curvature radius of the core material with which the hose-like elastic body was mounted | worn, for example. For example, the separation distance can be 1/50 to 1/10 of the radius of curvature of the core material including a hose-like elasticity. The first speed V1 can employ a moving speed of the blade blade in a conventional cutting device, and is, for example, 500 mm / s.

  In FIG. 4, the blade blade 14 moved to the position P is temporarily stopped, and subsequently moved from the position P at the second speed V2. The second speed V2 is a speed that is slower than the first speed V1, specifically a speed that is 1/50 to 1/5 of the first speed V1, and preferably a speed that is 1/30 to 1/10. It is. At this time, the hose-like elastic body is cut by the repulsive force against the load of the blade blade 14 moving at the second speed V2. Further, in this case, the plurality of blade blades 14 are arranged so as not to overlap with the air holes 13b in the y-axis direction (positions on the x-axis are different). That is, at the time of cutting, the tip end portion of the blade blade 14 does not reach the vent hole 13b, so that the tip end portion of the blade blade can be prevented from shaking in the gap g (see FIG. 7B) as in the prior art.

  In the manufacturing method of the present invention, the hose-like elastic body is inserted and held in a state where the air is press-fitted, and the hose-like elastic body is cut at a second speed slower than the first speed. The distortion of the elastic body can be prevented and the movement of the tip of the blade blade can be controlled with high accuracy, so that the width accuracy of the apron belt can be improved. Moreover, since the cutting surface by the blade blade and the air hole do not overlap, it is possible to suitably suppress the shake of the tip portion of the blade blade as in the conventional case. Furthermore, since the blade blade is moved at a second speed that is slower than the first speed, the blade blade and the core material are hardly damaged, and the durability of these members is excellent.

  In the manufacturing method of the present invention, since the blade blade is moved at the second speed V2, which is a slow speed in the cutting process, the position of the tip portion of the blade blade on the y-axis can be strictly controlled during cutting. For example, as shown in FIG. 5, the tip of the blade blade is moved to the inner layer 12c (rubber elastic layer) of the hose-like elastic body 12 without moving to the outer peripheral surface of the core member 13, and the hose-like elastic body is moved. 12 can be cut. That is, it does not penetrate the front-end | tip part of the blade blade 14, but is carried out to the inside layer of a hose-like elastic body. If it does so, each apron belt will not be separated completely, but it will be obtained as an apron belt connection body in the state where it was connected with a part of inner layer.

  The endless rubber elastic body of the present invention obtained in the cutting step shown in FIG. 5 will be described with reference to FIG. As shown in the upper part of FIG. 6, the apron belt coupling body 21 a is an endless rubber elastic body, and is a substantially columnar member in which the outer peripheral surface side is divided by the cut portion 22 and the inner peripheral surface side is connected. A plurality of the notches 22 are formed at predetermined intervals along the axial direction of the apron belt coupling body 21a, and are formed over the entire circumference in the circumferential direction.

  When the apron belt is used, a part of the apron belt coupling body 21a (for example, a part corresponding to one apron belt) is gripped and pulled by the user, so that part of the apron belt coupling body 21a is cut along the notch 22; An apron belt 1 is obtained (see the lower part of FIG. 6). In this case, the apron belt connecting body 21b as the remaining portion is in a state where the inner peripheral side is connected, and thereafter, the user tears it off by hand and uses it as individual apron belts. As described above, the apron belt coupling bodies 21a and 21b are precursors of the apron belt, and the intervals between the cut portions 22 correspond to the width W of the apron belt.

  In general, apron belts are packaged and transported with the individual parts completely separated. However, when packed and transported in such a state, the apron belt may be separated, and the shape may be difficult to maintain due to being crushed. On the other hand, since the apron belt coupling body does not disperse at the time of transportation or the like and its shape is easy to maintain, it is possible to suppress distortion when it is attached to various rollers as an apron belt. Moreover, since the apron belt is not separated and can be used by the user by tearing it from the apron belt coupling body as required, it is excellent in workability.

  The cut portion 22 may be formed so that at least a part of the inner peripheral surface side is connected to such an extent that each apron belt can be separated by gripping and pulling by the user. For example, when the tip of the blade blade is moved as shown in FIG. 5 in the cutting step, the cut portion is formed from the outer peripheral surface to a part of the outer layer 12a, the thread layer 12b, and the inner layer 12c. In this case, the apron belts are connected in the remaining part of the inner layer 12c. In the cutting step of FIG. 5, it is preferable to cut up to the thread layer 12b as the base material layer in order to improve workability when the user's apron belt is torn off.

  As described above, the width accuracy of the apron belt can be improved by the manufacturing method of the present invention in which the holding process and the cutting process are improved as compared with the conventional manufacturing method.

  The production method of the present invention is excellent in the width accuracy of an endless rubber elastic body and excellent in the durability of apparatus parts, and is therefore widely used for the production of endless rubber elastic bodies. Suitable for the manufacture of apron belts used in

DESCRIPTION OF SYMBOLS 1 Apron belt 2 Outer layer 3 Yarn layer 4 Inner layer 11 Cutting device 12 Hose-like elastic body 13 Core material 14 Blade blade 15 Rotating device 16 Air supply device 21a, 21b Apron belt coupling body 22 Cut part

Claims (6)

A method for producing an endless rubber elastic body,
A holding step for holding a hose-like elastic body that is a hose-like rubber elastic body on a columnar core, and a cutting blade in the state of rotating the held hose-like elastic body, the outer periphery of the hose-like elastic body Cutting the hose-like elastic body by moving in a direction orthogonal to the surface,
In the holding step, air is supplied to the air introduction hole of the cylindrical core material, and the cylindrical core material is blown out from a plurality of ventilation holes formed on the outer peripheral surface of the cylindrical core material. Including the step of inserting the hose-like elastic body from one axial end side of
In the cutting step, the cutting blade is moved at a first speed to a position close to the outer peripheral surface of the hose-like elastic body, and is moved at a second speed slower than the first speed from the close position, A method for producing an endless rubber elastic body, characterized by being a step of cutting the hose elastic body.   2. The vent holes are formed in a plurality of rows at predetermined intervals in the axial direction of the cylindrical core member, and are formed at equiangular intervals with respect to the axis center in each row. A method for producing the endless rubber elastic body according to the description.   3. The endless shape according to claim 1, wherein the vent hole and the cutting blade are arranged so as not to overlap in a direction orthogonal to an outer peripheral surface of the hose-like elastic body. A method for producing a rubber elastic body.   The vent hole formed on one end side in the axial direction of the columnar core member is formed larger than the hole diameter of the vent hole formed on the other end side in the axial direction of the columnar core member. The method for producing an endless rubber elastic body according to any one of claims 1 to 3. The endless rubber elastic body is composed of a plurality of layers, and has a base material layer and a rubber elastic layer laminated on the inside in the radial direction of the base material layer,
When the cutting blade is moved at the second speed in the cutting step, the tip of the cutting blade is moved to the rubber elastic layer without moving to the outer peripheral surface of the columnar core, and the hose shape is moved. The method for producing an endless rubber elastic body according to any one of claims 1 to 4, wherein the elastic body is cut. An endless rubber elastic body,
The endless rubber elastic body is a substantially cylindrical member in which the outer peripheral surface side is divided by a cut portion and the inner peripheral surface side is connected,
A plurality of the cut portions are formed at predetermined intervals along the axial direction, and each is formed over the entire circumference in the circumferential direction.
An endless rubber elastic body, wherein a part of the endless rubber elastic body is separable by a user holding and pulling the endless rubber elastic body.

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