JP2011240678A - Device for sticking rubber sheet and method of sticking rubber sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for sticking rubber sheet capable of precisely sticking a rubber sheet to a molding drum in a short period of time while suppressing the occurrence of air remainder between layers.SOLUTION: The device for sticking rubber sheet includes: a conveyer 2 which conveys the rubber sheet 3; the molding drum 4 on which the rubber sheet 3 conveyed by the conveyer 2 is wound; an approximating/separating mechanism 8 which relatively approximates/separates the conveyer 2 and the molding drum 4; and a control part which controls the driving of the conveyer 2, the molding drum 4 and the approximating/separating mechanism 8, wherein the control part causes the approximating/separating mechanism 8 to operate to thereby hold the tip of the rubber sheet 3 on the conveyer 2 between the molding drum 4 and the conveyer 2, and in such a state, drives the conveyer 2 and the molding drum 4 simultaneously and performs the control such that the rotation circumferential speed of the molding drum becomes larger than the conveyance speed of the conveyer and, thereby, the rubber sheet 3 loaded on the conveyer 2 is stuck onto the molding drum 4.

Description

  The present invention relates to a rubber sheet sticking device for winding an unvulcanized rubber sheet around a molding drum, which is preferably used in the manufacturing process of manufacturing a rubber cylinder used as a diaphragm for an air spring or the like. And a rubber sheet attaching method.

  In general, the diaphragm for an air spring is configured such that a reinforcing rubber layer obtained by reinforcing rubber with a reinforcing cord is disposed between an inner rubber layer and an outer rubber layer. In order to form the reinforcing rubber layer, first, an inner rubber layer is formed on the molding drum, the reinforcing rubber sheet cut to a fixed size is placed on the conveyor and conveyed to the front of the molding drum, and then manually attached by the operator. I was pasting. That is, it is difficult to attach the reinforcing rubber sheet to the molding drum with high accuracy using a machine, and therefore, it has been assumed that the operator has to rely on manual pasting work by an operator.

  However, when the reinforcing rubber layer is formed by hand sticking, variation in sticking accuracy due to the skill level of the operator occurs, or air is involved between the layers when sticking the reinforcing rubber sheet. Therefore, as shown in FIG. It was necessary to improve the interlayer adhesion by performing the stitcher process using the stitcher roller and to release the air between the layers.

  The stitcher process will be described in detail with reference to FIG. 20. The stitcher roller 31 is composed of a rotatable roller, and with respect to the molding drum 32 so that the roller rotation axis direction and the rotation axis direction of the molding drum are parallel to each other. , And are slidable in the axial direction of the forming drum 32. The stitcher rollers 31 can be installed as a pair of left and right. In this case, the stitcher rollers 31 are arranged at the center in the axial direction of the forming drum 32 in contact with each other.

  Then, after the reinforcing rubber layer 33 is formed on the molding drum 32, the left and right stitcher rollers 31, 31 are moved in the left-right direction while pressing the stitcher roller 31 against the rotating molding drum 32, whereby the stitcher roller 31, 31 presses the reinforcing rubber layer 33 spirally from the center of the molding drum 32 toward the left and right ends. As a result, the air accumulated between the layers is pushed out from the left and right ends of the molding drum 32, and at the same time, both ends in the circumferential direction of the reinforcing rubber layer 33 are joined together.

JP 2008-105290 A

  However, there is a limit to shortening the work time by hand-pasting work by an operator, and further, it takes time to carry out the stitcher process. Therefore, further improvement in productivity by reducing the time has been desired. Moreover, in order to carry out the stitcher process, it is necessary to install a stitcher roller.

  Therefore, in the present invention, in view of the above problems, a rubber sheet sticking apparatus and a rubber sheet sticking method capable of sticking a rubber sheet to a molding drum in a short time with high accuracy and suppressing occurrence of air accumulation between layers. The purpose is to provide.

  In order to solve the above-described problems, a rubber sheet sticking apparatus according to the present invention includes a conveyor that conveys a rubber sheet, a molding drum that winds the rubber sheet conveyed by the conveyor, and the conveyor and the molding drum that are relatively separated from each other. And a control unit that controls driving of the conveyor, the forming drum, and the separation / contact mechanism, and the control unit drives the separation / contact mechanism so that the tip of the rubber sheet on the conveyor is moved. By sandwiching between the molding drum and the conveyor, and simultaneously driving the conveyor and the molding drum in that state, the rotational peripheral speed of the molding drum is controlled to be higher than the conveying speed of the conveyor. The rubber sheet placed on the conveyor is attached to a molding drum.

  According to the said structure, a tension | tensile_strength can be applied to a rubber sheet by making the rotational peripheral speed of a forming drum faster than the conveyance speed of a conveyor. Thereby, it becomes possible to stick the rubber sheet around the molding drum. Furthermore, it is possible to improve the adhesion between the rubber layer formed on the molding drum and the rubber layer, and to prevent air accumulation between the layers. Therefore, it is possible to obtain a rubber sheet sticking apparatus capable of sticking the rubber sheet to the molding drum in a short time with high accuracy.

  The controller is configured so that the speed ratio V2 / V1 between the conveying speed V1 of the conveyor and the rotational peripheral speed V2 of the forming drum is 1.000 <V2 / V1 ≦ 1.100. It is preferable to control the driving, and it is more preferable to control so that 1.000 <V2 / V1 ≦ 1.020.

  By making the speed ratio V2 / V1 larger than 1.000, a frictional force is generated in the rubber sheet. With this frictional force, an appropriate tension can be applied to the rubber sheet. Specifically, the tension applied to the rubber sheet is preferably in the range of 0.01 N / cm to 0.50 N / cm. Therefore, the speed ratio V2 / V1 may be adjusted within the above range so that the tension applied to the rubber sheet becomes an appropriate strength.

  When the rubber sheet to be attached to the molding drum is a reinforcing rubber sheet, the reinforcing rubber sheet has a parallelogram shape because the reinforcing cord needs to be arranged so as to be inclined with respect to the circumferential direction of the molding drum. In this case, the parallelogram is formed such that the upper side and the lower side are inclined with respect to the reinforcing cord so that both sides are parallel to the reinforcing cord. Then, the reinforcing rubber sheet is attached to the molding drum such that the upper side and the lower side of the parallelogram are along both axial ends of the molding drum.

  When a parallelogram rubber sheet is affixed to the molding drum, the sandwiching width L of the rubber sheet (reinforced rubber sheet) sandwiched between the molding drum and the conveyor changes. In this case, when the speed ratio V2 / V1 between the conveying speed V1 of the conveyor and the rotational peripheral speed V2 of the forming drum is fixed to a constant value, the sandwiching width L of the rubber sheet changes, so that the unit length of the rubber sheet The tension applied to the strike changes.

  That is, as the sandwiched width L of the rubber sheet is reduced, the tension applied per unit length of the rubber sheet width is increased, so that the rubber sheet may be deformed. Therefore, in the present invention, when the sandwiching width L of the rubber sheet changes, the drive of the conveyor and the forming drum is controlled so that the speed ratio V2 / V1 approaches 1.000 as L decreases. did.

  With the above configuration, even when the sandwiching width L of the rubber sheet changes, it is possible to suppress a variation in the tension per unit length of the rubber sheet sandwiched between the conveyor and the forming drum, thereby preventing deformation of the rubber sheet. As a result, fluctuations in the inclination angle of the reinforcing cord can be prevented.

  As described above, in the present invention, a rubber sheet attaching method for winding a rubber sheet placed and conveyed on a conveyor around a molding drum, the tip of the rubber sheet being sandwiched between the molding drum and the conveyor In this state, the conveyor and the forming drum are simultaneously driven, and the rotational peripheral speed of the forming drum is made faster than the conveying speed of the conveyor, thereby molding the rubber sheet placed on the conveyor. The present invention provides a rubber sheet sticking method characterized in that the rubber sheet is stuck on a drum.

  In the present invention, when the rubber sheet placed and conveyed on the conveyor is wound around the molding drum, the front end of the rubber sheet is sandwiched between the molding drum and the conveyor, and the conveyor and the molding drum are simultaneously driven in this state. At the same time, the rotating peripheral speed of the forming drum is faster than the conveying speed of the conveyor, so it is possible to apply tension to the rubber sheet and attach the rubber sheet to the forming drum in a short time with high accuracy. It becomes.

Schematic plan view showing a rubber sheet affixing device according to the present invention Side view of FIG. Partial enlarged view of FIG. The figure which shows the reinforcement rubber sheet conveyance completion state by a 2nd conveyor in FIG. Plan view of the second conveyor in FIG. The figure which shows a state when driving a 2nd conveyor in the reverse direction in FIG. The figure which shows the state immediately after the reinforcement rubber sheet of FIG. 6 transferred to the 2nd conveyor. Plan view of the second conveyor in FIG. The partially expanded view which shows the state which advanced the 2nd conveyor in FIG. The figure which shows the state which raised the downstream end part of the 2nd conveyor in FIG. A perspective view showing a reinforcing rubber sheet sandwiched between a forming drum and a second conveyor Sectional view showing unvulcanized green molded body of air spring diaphragm Sectional drawing which shows an example of the usage pattern of the diaphragm for air springs Partial enlarged view of air spring diaphragm Sectional view showing the cutter device Diagram showing reinforced rubber with reinforcing cords embedded in the length direction The figure which shows the condition of rejoining after cutting the reinforcement rubber of FIG. The figure which shows the relationship between the clamping width L of a reinforced rubber sheet, and speed ratio V2 / V1 The figure which shows the joint margin and gap width in the reinforced rubber layer Diagram showing the conventional stitcher process

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic plan view showing a rubber sheet sticking device according to the present invention, and FIG. 2 is a side view of FIG.

  The rubber sheet affixing device of the present invention forms a reinforcing rubber layer by adhering a reinforcing rubber sheet as a rubber sheet on the inner rubber layer formed on the outer peripheral surface of the molding drum in the manufacturing process of the diaphragm for the air spring. It is a device.

  As shown in FIGS. 1 and 2, the rubber sheet affixing device cuts the belt-like reinforcing rubber A into a predetermined size, and conveys the cut reinforcing rubber sheet 3 downstream, The second conveyor 2 that is disposed downstream of the conveyor 1 and conveys the reinforcing rubber sheet 3 supplied from the first conveyor 1, the forming drum 4 around which the reinforcing rubber sheet 3 is wound, and the second conveyor and the forming drum are relative to each other. And a separation / contact mechanism 8 for separating / contacting to / from.

  The 1st conveyor 1 and the 2nd conveyor 2 are arrange | positioned on a straight line so that the conveyance direction of the reinforcement rubber sheet 3 may turn into the same direction. Further, the second conveyor 2 and the forming drum 4 are configured such that the conveying direction of the reinforcing rubber sheet 3 is orthogonal to the rotation axis B direction of the forming drum 4 when the rubber sheet sticking device is viewed in plan. Are arranged close to each other.

  On the upstream side of the first conveyor 1, a reinforcing rubber raw fabric roll C in which the reinforcing rubber A is wound in a roll shape is installed, and the belt-shaped reinforcing rubber A drawn out from the raw fabric roll C passes over the first conveyor 1. Be transported. The reinforced rubber A is obtained by wrapping a slender cord in which a plurality of reinforcing cords 5 are connected with a weft thread with a thin sheet-like rubber. The reinforcing cord 5 is embedded in the rubber while being inclined at a predetermined inclination angle α with respect to the length direction X of the reinforcing rubber.

  A cutter device 6 for cutting the belt-like reinforcing rubber A is installed above the center of the first conveyor 1. The cutter device 6 can cut the reinforcing rubber at various angles with respect to the length direction X of the reinforcing rubber A. When the belt-shaped reinforcing rubber A is conveyed on the first conveyor 1 and moves forward to the position of the cutter device 6, the first conveyor 1 is temporarily stopped.

  Then, the belt-like reinforcing rubber A is cut by the cutter device 6 in a state where the cutter device 6 is inclined by an inclination angle α with respect to the direction along the reinforcing cord 5, that is, the length direction X of the reinforcing rubber A. Then, the first conveyor 1 is driven again to advance and stop by a predetermined distance, and the reinforcing rubber is cut by the cutter device 6 at the same inclination angle α. Thereby, the reinforcing rubber sheet 3 is cut into a parallelogram.

  An adsorption device 7 capable of adsorbing the belt-like reinforcing rubber A is installed on the upstream side of the cutter device 6. The suction device 7 is composed of a plurality of suction pads, and is normally arranged so as to be positioned above the first conveyor 1. However, the suction device 7 is lowered after the reinforcing rubber sheet 3 is cut by the cutter device 6. Then, the belt-like reinforcing rubber A on the upstream side of the reinforcing rubber sheet 3 is adsorbed.

  Then, the adsorption | suction apparatus 7 raises and makes it the state which floated the strip | belt-shaped reinforcement rubber A from the 1st conveyor 1. FIG. When the first conveyor 1 is driven in this state, only the reinforcing rubber sheet 3 is conveyed downstream on the first conveyor 1 without changing the position of the belt-like reinforcing rubber A. Then, after the reinforcing rubber sheet 3 is completely transferred to the second conveyor 2, the reinforcing rubber A is detached from the adsorption device 7 and placed on the first conveyor 1.

  A second conveyor 2 is disposed on the downstream side of the first conveyor 1. The second conveyor 2 is arranged at a position lower than the first conveyor 1 so that a part of the upstream side of the second conveyor 2 overlaps a part of the downstream side of the first conveyor 1. The 1st conveyor 1 and the 2nd conveyor 2 are arrange | positioned on a straight line so that the conveyance direction of the reinforcement rubber sheet 3 may become the same direction, and both the conveyors 1 and 2 drive at the same speed with a servomotor.

  Furthermore, in the second conveyor 2, not only can the conveyor be driven in the same direction as the first conveyor 1, that is, from the raw roll C side toward the forming drum 4 side (hereinafter referred to as the forward direction), the conveyor Can be driven in the direction opposite to the forward direction (hereinafter referred to as the reverse direction).

  By driving the first conveyor 1 in the forward direction, the reinforcing rubber sheet 3 is conveyed to the downstream end of the first conveyor 1 and bent downward by its own weight from the front end side protruding from the downstream end of the first conveyor 1. And contact the second conveyor (see FIG. 3). At this time, by driving the second conveyor 2 in the forward direction, the reinforcing rubber sheet 3 moves to the second conveyor 2 in the same direction as when it was placed on the first conveyor 1. Then, when the reinforcing rubber sheet 3 moves to a predetermined position on the downstream side of the second conveyor 2, the driving of the second conveyor 2 is stopped (see FIGS. 4 and 5).

  As shown in FIGS. 1 and 2, the separation / contact mechanism 8 includes a moving device 9 that enables the second conveyor 2 on which the reinforcing rubber sheet 3 is placed to reciprocate toward the molding drum 4, and the second conveyor 2. It is comprised from the raising / lowering apparatus 11 which can raise / lower the downstream edge part.

  The moving device 9 includes a rail 12 and a carriage 13 that can travel on the rail 12, and the second conveyor 2 is mounted on the carriage 13. The carriage 13 can be moved by driving a motor (not shown). Further, the carriage 13 is provided with a lifting device 11 capable of adjusting the height of the downstream side of the carriage 13. As the lifting device 11, a known mechanism such as a feed screw mechanism or a hydraulic mechanism can be employed. With this lifting device 11, the downstream end of the second conveyor 2 mounted on the carriage 13 can be lifted and lowered.

  The rubber sheet pasting device is provided with a control unit that controls driving of the first conveyor 1, the second conveyor 2, the separation / contact mechanism 8, the forming drum, and the like. The control unit is configured by a microcomputer including an input circuit, a CPU, a memory, an output circuit, and the like.

  The reinforcing rubber layer 14 in the air spring diaphragm is formed by laminating a plurality of reinforcing rubber sheets 3. At this time, the reinforcing cords 5 in the reinforcing rubber layer 14 are inclined at a predetermined inclination angle α with respect to the circumferential direction of the molding drum 4 by alternately turning the plurality of laminated reinforcing rubber sheets 3 in the opposite directions. It is arranged to cross each other alternately in an inclined state.

  In order to form the reinforced rubber layer 14 having the above-described configuration, first, as described above, the control unit drives the first conveyor 1 and the second conveyor 2 in the forward direction to move the reinforced rubber sheet 3 to the second conveyor 2. 4 and 5 (the signal from the position detector such as an optical sensor is detected and the driving of the second conveyor 2 is stopped at this position).

  Next, the control unit drives the separation / contact mechanism 8 to sandwich the tip of the reinforcing rubber sheet 3 between the molding drum 4 and the second conveyor 2. Specifically, the control unit moves the carriage 13 toward the forming drum 4 as shown in FIG. Thereafter, as shown in FIG. 10, the lifting device 11 is driven to raise the second conveyor 2, thereby sandwiching the tip of the reinforcing rubber sheet 3 between the molding drum 4 and the second conveyor 2. An inner rubber layer 15 is formed on the surface of the molding drum 4 in advance.

  In this state, the control unit drives the second conveyor 2 and the forming drum 4 at the same time, and controls the rotational peripheral speed of the forming drum 4 to be higher than the conveying speed of the conveyor. As a result, a force for pulling the reinforcing rubber sheet 3 is generated by the rotation of the molding drum 4. At the same time, a frictional force is generated in the reinforcing rubber sheet 3. Tension is applied to the reinforcing rubber sheet 3 by this frictional force.

  In this way, by applying tension to the reinforcing rubber sheet 3, no slack is generated between the second conveyor 2 and the reinforcing rubber sheet 3, and the reinforcing rubber sheet 3 is applied while the reinforcing rubber sheet 3 is stuck to the molding drum 4. The displacement of the sheet 3 can be restricted, and the first ply constituting layer 14a constituting the reinforcing rubber layer 14 can be formed while suppressing air accumulation between the layers.

  Subsequently, the control unit forms a second ply constituent layer 14 b that constitutes the reinforcing rubber layer 14. For this purpose, first, the reinforcing rubber A is cut in the first conveyor 1 as described above, and then the reinforcing rubber sheet 3 is conveyed in the forward direction. When the reinforcing rubber sheet 3 protrudes from the downstream end of the first conveyor 1 and curves downward due to its own weight and comes into contact with the second conveyor, the controller drives the second conveyor 2 in the reverse direction.

  As a result, the reinforcing rubber sheet 3 is placed on the second conveyor 2 in the opposite direction, as shown in FIG. As shown in FIG. 7, the controller stops driving the second conveyor 2 in the reverse direction when the reinforcing rubber sheet 3 is completely placed on the second conveyor 2. Then, the control unit drives the second conveyor 2 in the forward direction, and stops the driving of the second conveyor 2 when the reinforcing rubber sheet 3 reaches the broken line position in FIG. By the above operation, the reinforcing rubber sheet 3 set on the second conveyor 2 has a mirror image relationship with the first-ply reinforcing rubber sheet 3 as shown in FIG.

  Next, in the same manner as described above, the control unit drives the separation / contact mechanism 8 to sandwich the tip of the reinforcing rubber sheet 3 between the molding drum 4 and the second conveyor 2, and in this state, the second conveyor 2 and The molding drum 4 is driven simultaneously, and the rotational peripheral speed of the molding drum 4 is controlled to be faster than the conveyor conveyance speed. In this way, the second ply constituent layer 14b constituting the reinforcing rubber layer 14 can be formed.

  Hereinafter, the constituent layers of the reinforcing rubber layer 14 are sequentially formed in the same manner as in the first ply when the constituent layers to be formed are odd, and in the same manner as in the second ply when the constituent layers to be formed are even. Is formed. The reinforcing rubber layers 14 formed by the above operation are arranged so that the reinforcing cords 5 are alternately intersected in a state where the reinforcing cords 5 are inclined at a predetermined inclination angle α with respect to the circumferential direction of the molding drum 4.

  In this embodiment, since the reinforcing rubber sheet 3 is formed in a parallelogram, when the reinforcing rubber sheet 3 is attached to the forming drum 4, as shown in FIG. The sandwiching width L in the width direction of the reinforcing rubber sheet 3 to be sandwiched changes. In this case, when the speed ratio V2 / V1 between the conveyance speed V1 of the second conveyor 2 and the rotational peripheral speed V2 of the forming drum 4 is fixed to a constant value, the sandwiching width L of the reinforcing rubber sheet 3 changes, The tension applied per unit length of the reinforced rubber sheet 3 changes.

  That is, as the sandwiching width L of the reinforcing rubber sheet 3 is reduced, the tension applied per unit length of the reinforcing rubber sheet 3 is increased, so that the reinforcing rubber sheet 3 may be deformed. Therefore, in the present embodiment, when the sandwiching width L of the reinforcing rubber sheet 3 changes, the second conveyor 2 and the molding are performed in the control unit so that the speed ratio V2 / V1 approaches 1.000 as L decreases. The driving of the drum 4 is controlled. As a result, the reinforcing rubber sheet 3 can be attached to the molding drum 4 without being deformed.

  As described above, it is possible to form the reinforced rubber layer 14 with high accuracy while suppressing the accumulation of air between layers, and the defect rate can be reduced. In addition, it is not necessary to perform a stitcher process after the reinforcing rubber layer 14 is formed, so that the molding time can be shortened.

  After forming the reinforced rubber layer 14, an outer rubber layer 16 is formed on the surface of the reinforced rubber layer 14 to obtain a cylindrical body made of unvulcanized rubber. Furthermore, as shown in FIG. 12, the cylindrical body is subjected to steps such as increasing the diameter at one end in the axial direction, attaching the bead ring 17, and turning back the end in the axial direction of the cylindrical body. An unvulcanized green molded body 18 of the diaphragm can be obtained.

  The obtained green molded body 18 is installed in a mold, a rubber bag is incorporated inside the green molded body 18, the mold is closed, and then air vulcanization is performed by pressurizing air into the bag to thereby form an air spring. A diaphragm can be obtained.

  FIG. 13 is a cross-sectional view showing an example of a usage pattern of the air spring diaphragm. As illustrated, the air spring diaphragm 21 is hermetically joined between an upper plate 22 on the vehicle body side and a piston 23 on the wheel side as a component of the air spring. FIG. 14 is a partially enlarged view of the air spring diaphragm. The air spring diaphragm 21 includes an inner rubber layer 15, a reinforcing rubber layer 14, and an outer rubber layer 16, and bead rings 17 are embedded at both ends in the axial direction.

  Here, the cutter device 6 in the present embodiment will be described in detail. As shown in FIG. 15, the cutter device 6 includes a pair of cutter blades 24, 24 and a guide member 25 that suspends and supports the cutter blades 24, 24 slidably in the horizontal direction.

  The guide member 25 is a straight plate-like body, and is provided rotatably so as to be inclined at various angles with respect to the reinforcing rubber length direction X of the first conveyor 1. A pair of cutter blades 24, 24 are attached to the center of the bottom surface of the guide member 25 so as to be slidable and movable up and down. Further, presser plates 26 and 26 for pressing the reinforcing rubber A are attached to the guide member 25 so as to be movable up and down so as to surround the cutter blades 24 and 24 from the upstream side and the downstream side.

  When the reinforcing rubber A is cut in the cutter device 6 having the above configuration, first, the first conveyor 1 conveys the reinforcing rubber A to a predetermined position and stops. Thereafter, the presser plates 26, 26 are lowered to fix the reinforcing rubber A. Thereafter, the cutter blades 24 and 24 are lowered, and the cutting edge is pierced into the reinforcing rubber to a depth just before the cutting edge penetrates the reinforcing rubber. In this state, the reinforcing rubber A is cut by the cutter blades 24, 24 sliding to the left and right.

  Moreover, the raw material C of the reinforcing rubber embedded in the rubber with the reinforcing cord 5 inclined at a predetermined inclination angle α used in the present embodiment can be manufactured as follows. That is, first, as shown in FIG. 16, a plurality of reinforcing cords 5 are embedded along the length direction of the reinforcing rubber by sandwiching the reinforcing cord 5 with a thin sheet of rubber and pressing it with a pressure roll. A band-shaped reinforcing rubber D is prepared.

  Next, the reinforcing rubber D is cut at an inclination angle α at regular intervals with respect to the length direction of the belt-shaped reinforcing rubber D. Then, as shown in FIG. 17, by rotating the cut reinforcing rubber sheet E by an angle α and rejoining the portions that were both ends in the width direction of the belt-like reinforcing rubber, the length direction X of the reinforcing rubber On the other hand, it is possible to obtain a raw material C of a roll-shaped reinforcing rubber in which a reinforcing cord is embedded in the rubber while being inclined at an inclination angle α.

  Hereinafter, the present invention will be described in more detail with reference to examples. In this example, the reinforcing rubber layer of the diaphragm for the air spring was actually formed using the rubber sheet sticking device described in the above embodiment.

  Specifically, the drum diameter of the molding drum 4 is 176 mm, the raw fabric width of the reinforcing rubber C is 640 mm, the inclination angle α of the reinforcing cord 5 is 53 °, and the rotational peripheral speed V2 of the molding drum is constant at 1000.0 cm / min. did.

  On the other hand, the conveyance speed V1 of the second conveyor 2 was adjusted as shown in FIG. 18 in accordance with the change in the sandwiching width L of the reinforcing rubber sheet. That is, the conveyance speed V1 of the second conveyor 2 at this time was set to 997.0 cm / min so that the speed ratio V2 / V1 at the front end and the rear end of the reinforcing rubber sheet 3 was 1.003.

  On the other hand, when the sandwiching width L of the reinforcing rubber sheet 3 is the maximum 640 mm, the conveyance speed V1 of the second conveyor 2 at this time is set to 990.0 cm / min so that the speed ratio V2 / V1 is 1.010. . The second conveyor 2 is configured so that the speed ratio V2 / V1 changes proportionally from the front end of the reinforcing rubber sheet to the maximum width and from the maximum width of the reinforcing rubber sheet to the rear end. The conveyance speed V1 was adjusted (Example 1). Specifically, the conveyance speed V1 of the second conveyor with respect to the movement amount of the second conveyor 2 is controlled by the sequencer.

  As another condition (Example 2), the rotational speed V2 of the forming drum is 1000.0 cm / min, so that the speed ratio V2 / V1 at the front and rear ends of the reinforcing rubber sheet is 1.080. In addition, the conveyance speed V1 of the second conveyor was 926.0 cm / min.

  On the other hand, the conveyance speed V1 of the second conveyor at this time was set to 917.5 cm / min so that the speed ratio V2 / V1 was 1.090 when the sandwiched width of the reinforcing rubber sheet was 640 mm at the maximum. The speed ratio V2 / V1 is the same as in the first embodiment so that the speed ratio V2 / V1 changes proportionally from the front end of the reinforcing rubber sheet to the maximum width and from the maximum width of the reinforcing rubber sheet to the rear end. The conveyance speed V1 of the second conveyor was adjusted.

  The state when 1 ply of the reinforcing rubber sheet 3 was wound around the molding drum 4 under the above conditions (Examples 1 and 2) was evaluated. As evaluation items, as shown in FIG. 19, the joint margin “a” in the circumferential direction of the reinforcing rubber sheet 3, the shift width “b” in the axial direction, and the required time were measured. As a comparison, the joint allowance a, the displacement width b, and the required time when the reinforced rubber layer was formed by the conventional manual pasting method were measured. The results are shown in Table 1.

  As shown in Table 1, the reinforced rubber layer (product of the present invention) formed using the rubber sheet sticking device according to the present invention has a smaller joint margin and displacement width than the reinforced rubber layer formed by the conventional method, It can be seen that there is little variation. The work in the conventional method needs to be performed by a skilled person, but the skill of the worker is unnecessary in the present invention, and it is possible to reduce the quality variation regardless of the worker.

  Furthermore, since the stitcher process is not required in the present invention, the overall work time can be significantly reduced to 1/3 of the conventional method.

  Further, in the present invention, when Example 1 and Example 2 are compared, Example 1 can be applied with higher accuracy, and the speed ratio V2 / V1 in Example 2 is close to 1.100. Although there is no problem, it is more preferable that V2 / V1 is used in a range close to 1.000, that is, in a range of 1.000 <V2 / V1 ≦ 1.020.

DESCRIPTION OF SYMBOLS 1 1st conveyor 2 2nd conveyor 3 Reinforcement rubber sheet 4 Molding drum 5 Reinforcement cord 6 Cutter device 7 Suction device 8 Separation device 9 Moving device 11 Lifting device 12 Rail 13 Cart 14 Reinforcement rubber layer 15 Inner rubber layer 16 Outer rubber layer 17 Bead Ring 18 Green Molded Body 21 Air Spring Diaphragm 22 Upper Blade 23 Piston 24 Cutter Blade 25 Guide Member 26 Presser Plate A Band-shaped Reinforcement Rubber B Shaft Rotating Shaft C Reinforcement Rubber Roll X Reinforcement Rubber Length direction

Claims (4)

A conveyor for conveying a rubber sheet, a forming drum for winding the rubber sheet conveyed by the conveyor, a separation / contact mechanism for relatively separating and contacting the conveyor and the forming drum, and driving of the conveyor, the forming drum and the separation / contact mechanism A control unit that controls the control unit, the control unit driving the separation / contact mechanism to sandwich the tip of the rubber sheet on the conveyor between the molding drum and the conveyor, and in that state the conveyor The rubber sheet placed on the conveyor is affixed to the molding drum by simultaneously driving the molding drum and simultaneously controlling the rotational peripheral speed of the molding drum to be higher than the conveying speed of the conveyor. A rubber sheet affixing device characterized by that. The controller includes the conveyor and the forming drum so that a speed ratio V2 / V1 between the conveying speed V1 of the conveyor and a rotational peripheral speed V2 of the forming drum is 1.000 <V2 / V1 ≦ 1.100. The rubber sheet sticking device according to claim 1, wherein the driving of the rubber sheet is controlled. When the width L of the rubber sheet sandwiched between the forming drum and the conveyor changes, the control unit drives the conveyor and the forming drum so that the speed ratio V2 / V1 approaches 1.000 as L decreases. The rubber sheet sticking device according to claim 2, wherein the rubber sheet sticking device is controlled. A rubber sheet affixing method in which a rubber sheet placed on a conveyor and conveyed is wound around a molding drum, the tip of the rubber sheet being sandwiched between a molding drum and a conveyor, and the conveyor and molding in that state The rubber sheet placed on the conveyor was attached to the molding drum by simultaneously driving the drum and making the rotational peripheral speed of the molding drum faster than the conveying speed of the conveyor. A rubber sheet sticking method characterized by the above.

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