JP2019055578A - Tire formation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the attachment accuracy of a tire constituent member. SOLUTION: At a plurality of work stations 6 arranged along a track of a drum holding device 5, a tire constituent member is attached to a forming drum 7. The forming drum 7 is held by the drum holding device 5 so as to be vertically movable. Each work station 6 is provided with a work position P and a standby position Q vertically. When the work is completed in one work station 6, the drum holding device 5 moves the forming drum 7 from the work position P of the work station 6 where work has been completed to the next work while moving laterally to the next work station 6. It is moved up or down to the standby position Q of the station. [Selection diagram] FIG.

Description

  The present invention relates to a tire forming method for forming a green tire with high accuracy.

  Conventionally, a drum holding device that rotatably holds a forming drum is moved laterally in the drum axial direction, and tire constituent members are sequentially attached to the forming drum at each of a plurality of work stations arranged along the track. Thus, a forming method for forming a green tire has been proposed (see, for example, Patent Document 1 below).

  In this forming method, a member attaching device for attaching a tire constituent member to a forming drum is installed at each work station. The forming drum is held at a constant height by a drum holding device, and is sent to each work station in this constant height state. And in each work station, the member sticking apparatus side is moved up and down, and the sticking work of each member sticking apparatus is performed according to the said forming drum.

  However, when the member sticking apparatus side is moved up and down, vibration is applied to the tire constituent member, which causes a problem of lowering the sticking accuracy. In particular, in a member affixing device used in the strip wind method, the supply amount must be adjusted in accordance with the rotation of the molding drum while supplying the tire constituent members (rubber strips), and the supply angle and the like must also be adjusted. There is a case. At this time, adjustment control is difficult because these parameters change every moment according to the situation of the strip wind. However, when the member sticking device side is further moved up and down, the adjustment control becomes more difficult, and the sticking accuracy is more significantly reduced.

JP 2014-69563 A

  An object of the present invention is to provide a tire forming method that suppresses misalignment caused by vibration or the like and improves the accuracy of attaching a tire constituent member on the basis of holding the molding drum so as to be movable up and down.

According to the present invention, a drum holding device that rotatably holds a forming drum is moved laterally in a drum axial direction, and a plurality of work stations arranged along a track of the drum holding device are respectively connected to tire forming members on the forming drum. A tire forming method including a step of attaching
The molding drum is held by the drum holding device so as to be vertically movable,
In each of the work stations, a work position and a standby position for attaching the tire constituent members are provided above and below,
When the pasting work is completed at one work station, the drum holding device moves sideways to the next work station while moving the molding drum from the work position of the work station where the work is finished to the next work. Moved up or down to the standby position of the station.

  In the tire forming method according to the present invention, the ratio of the moving speed of the lateral movement and the moving speed of the upward movement or the downward movement is constant, so that the molding drum is operated at the work station where the work is completed. It is preferable to move diagonally at the shortest distance from the position to the standby position of the next work station.

  In the tire forming method according to the present invention, it is preferable that the forming drum moves with a downward inclination along the shortest distance.

  In the tire forming method according to the present invention, the tire constituent member includes a belt ply constituent member, and at least one of the plurality of work stations performs a belt forming step of attaching the belt ply constituent member to the forming drum. Is preferred.

In the tire forming method according to the present invention, the work station performing the belt forming step includes, as the work position, a first work position where a first belt ply constituent member is attached below the stand-by position, and the stand-by. A second working position for affixing the second belt ply component above the position,
Preferably, the molding drum moves down from the standby position to the first work position and then moves up from the first work position to the second work position.

  The tread contact width means the maximum width in the tire axial direction of the contact surface that comes into contact when a normal load is applied to a tire that is assembled with a normal rim and filled with a normal internal pressure.

  In the present invention, at each work station, the work position and the standby position are provided vertically, and the forming drum is held by the drum holding device so as to be vertically movable. Accordingly, by fixing the member sticking device side of each work station and moving the forming drum up and down, the tire constituent members can be stuck at each work position. Thereby, the position shift resulting from a vibration etc. can be suppressed and the sticking precision of a tire structural member can be improved.

  Further, the molding drum moves laterally from the working position of one work station to the standby position of the next work station while moving up or down. That is, when the work is completed at one work station and the drum holding device arrives at the next work station, the forming drum has already been moved to the standby position of the next work station.

  Therefore, at the next work station, the forming drum can be moved from the standby position to the work position and start the pasting work upon arrival. In addition, the molding drum is moved to the standby position of the next work station using the lateral movement time between the work stations. Therefore, it is possible to save time and shorten the work time.

1 is a side view schematically showing one embodiment of a tread forming line in which a tire forming method of the present invention is implemented. It is a side view which shows a drum holding device schematically. (A), (B) is the conceptual diagram which looked at the belt formation process from the one side of the drum axial direction. (A), (B) is the conceptual diagram seen from the upper side which shows a belt formation process. (A) is the conceptual diagram which looked at the band formation process from the one side of the drum axial direction, (B) It is the conceptual diagram seen from the upper side. (A) is the conceptual diagram which looked at the tread rubber formation process from the one side of a drum axial direction, (B) It is the conceptual diagram seen from the upper side.

Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 shows a case where the tire forming method of the present invention is employed in a tread forming line TL to form a tread ring T of a raw tire. As is well known, the tread ring T forms a tread portion of the tire. In this example, the tread ring T includes the first and second belt plies 2L and 2U, the band ply 3, and the tread rubber 4. . These are arranged in this order from the inner side to the outer side in the tire radial direction.

  The tread formation line TL includes a drum holding device 5 that moves laterally in the drum axial direction F, and a plurality of work stations 6 that are arranged in the drum axial direction F along the trajectory of the drum holding device 5. At each work station 6, the tread ring T is formed by attaching a tire constituent member to the forming drum 7 held by the drum holding device 5.

  In each work station 6, a work position P and a standby position Q for attaching tire constituent members to the forming drum 7 are provided. The work position P and the standby position Q are spaced apart from each other. When the forming drum 7 is at the work position P, the tire constituent member is attached. When the molding drum 7 is in the standby position Q, the molding drum 7 is in a standby state. For convenience, in the drawings, the working position P is indicated by the axial position of the molding drum 7 at the working position P, and the standby position Q is indicated by the axial position of the molding drum 7 at the standby position Q. ing.

  In this example, the work station 6 forms a belt forming station 6A for forming the first and second belt plies 2L, 2U, a band forming station 6B for forming the band ply 3, and a tread rubber 4. A tread rubber forming station 6C. In this example, as tire constituent members, first and second belt ply constituent members 10L and 10U for forming first and second belt plies 2L and 2U, and band ply constituent members for forming band plies. 13 and a tread rubber component 16 for forming the tread rubber 4 are used.

  As shown in FIG. 2, the drum holding device 5 includes a lateral movement table 20 and a lifting table 21, and the molding drum 7 is rotatably held on the lifting table 21.

  The lateral movement table 20 can be laterally moved in the drum axial direction F while being guided by, for example, a rail 22 installed on the floor surface. The lateral movement table 20 is driven and controlled by appropriate driving means (not shown) including, for example, a servo motor. As a result, the molding drum 7 can be moved and stopped at the position of each work station 6.

  The elevator 21 is guided by a vertical guide 23 provided on the laterally movable table 20 and is supported so as to be vertically movable. The elevator 21 is driven and controlled by appropriate driving means (not shown) including, for example, a servo motor. As a result, the forming drum 7 can be moved and stopped to an arbitrary height position including the work position P and the standby position Q determined for each work station 6.

  The forming drum 7 is a cylindrical drum capable of expanding and contracting and having a known structure.

  In the belt forming station 6A, a belt sticking device 9A is installed, and a belt forming process is performed. In the belt forming step, the first and second belt ply constituent members 10L and 10U are sequentially attached to the forming drum 7 by the belt attaching device 9A, whereby the first and second belt plies 2L and 2U are attached. It is formed.

  As shown in FIG. 4, the first and second belt ply constituting members 10L and 10U are made of rubber belts, which are inclined at an angle of, for example, 10 to 40 ° with respect to the length direction. Forms a wide belt-like sheet with topping. Then, the first and second belt plies 2L and 2U are formed by being wound once around the forming drum 7. The first belt ply constituent member 10L and the second belt ply constituent member 10U are substantially the same except that the inclination direction of the belt cord is reversed and the width is slightly different.

  As shown in FIGS. 3 (A) and 3 (B), the belt sticking device 9A of the present example has a first conveyor 11 on the lower side for sticking the first belt ply constituting member 10L, and a second belt ply construction. For example, the second conveyor 12 on the upper side is attached to the member 10U.

The 1st conveyor 11 is a belt conveyor, Comprising: The 1st belt ply structural member 10L is conveyed in the length direction by the upper surface 11s. And the 1st belt ply structural member 10L is affixed when the forming drum 7 press-contacts with the 1st belt ply structural member 10L on the upper surface 11s. Accordingly, the forming drum 7 to the position of the first belt ply component 10L and pressure capable forming drum 7 on the upper surface 11s, a first working position PA ₁ is set.

The second conveyor 12 includes first and second conveyor portions 12a and 12b that are arranged to be connected. The 1st conveyor part 12a conveys the 2nd belt ply structural member 10U in the length direction on the upper surface. The second conveyor portion 12b attracts and receives the second belt ply constituting member 10U from the first conveyor portion 12a by its lower surface 12s and conveys it in the length direction. Then, the second belt ply constituent member 10U is affixed by the forming drum 7 being in pressure contact with the second belt ply constituent member 10U adsorbed on the lower surface 12s. Accordingly, the forming drum 7 to the position of the second belt ply component 10U and pressure capable forming drum 7 adsorbed at the lower surface 12s, a second working position PA ₂ is set.

The standby position QA is set between the first working position PA ₁ and the second and working position PA _2. That is, the first working position PA ₁ is located below the waiting position QA, also the second working position PA ₂ is positioned above the standby position QA.

  As shown in FIGS. 5A and 5B, the band forming station 6B is provided with a band sticking device 9B, and a band forming process is performed. In the band forming step, the band ply constituting member 13 is attached to the forming drum 7 by the band attaching device 9B, whereby the band ply 3 is formed.

  As the band ply constituting member 13, in this example, a narrow tape-shaped cord strip 13A obtained by rubber-topping an array of band cords aligned in the length direction is used. Then, the band ply 3 is formed by continuously winding the cord strip 13 </ b> A spirally in the tire circumferential direction on the forming drum 7.

  The band sticking device 9B of this example includes an actuator 15 including a belt conveyor portion 15A and a pressure roller 15B. The belt conveyor unit 15A sends, for example, a cord strip 13A that is rewound from a reel (not shown) from the feed roller 15a at the tip to the forming drum 7. The pressure roller 15B is supported so as to be able to move up and down, and the cord strip 13A that has been fed out can be pressed against the forming drum 7 and attached by lowering. The actuator 15 moves in the drum axial direction F in synchronization with the rotation of the forming drum 7. Accordingly, the work position PB is set at the position of the forming drum 7 that can be pressed against the cord strip 13A by the lowering of the pressure roller 15B. A standby position QB is set at an arbitrary height position below the work position PB.

  As shown in FIGS. 6A and 6B, the tread rubber forming station 6C is provided with a tread rubber attaching device 9C to perform a tread rubber forming step. In the tread rubber forming step, the tread rubber constituting member 16 is attached to the forming drum 7 by the tread rubber attaching device 9C, whereby the tread rubber 4 is formed.

  In this example, a narrow tape-shaped rubber strip 16A is used as the tread rubber constituent member 16, and the tread rubber 4 having a predetermined cross-sectional shape is formed by a strip wind method. Specifically, the rubber strip 16 </ b> A is continuously wound spirally in the tire circumferential direction on the molding drum 7, whereby the tread rubber 4 is formed.

  The tread rubber pasting device 9C of this example includes an actuator 17 including a belt conveyor portion 17A and a pressure roller 17B. The belt conveyor unit 17A sends, for example, a rubber strip 16A pushed out from a rubber extruder (not shown) from a feed roller 17a at the tip to the molding drum 7. The pressure roller 17B is supported so as to be movable up and down, and the lowered rubber strip 16A can be pressed against the molding drum 7 and attached by lowering. The actuator 17 moves in the drum axial direction F in synchronization with the rotation of the forming drum 7. Accordingly, the work position PC is set at the position of the molding drum 7 that can be brought into pressure contact with the rubber strip 16A by the lowering of the pressure roller 17B. The standby position QC is set at an arbitrary height position below the work position PC.

  As shown in FIG. 1, a tread ring T formed on a forming drum 8 is used as a work station 6 on a tread formation line TL in the next step (for example, the tread ring T is joined to a base tire to form a raw tire. An unloading station 18 for unloading is arranged in the assembling step. In the carry-out station 18, the tread ring T on the forming drum 8 is transferred to a known tread transfer device 19 and carried out at the standby position Q.

  Next, as shown in FIG. 1, in the tread formation line TL, when the pasting operation is completed at one work station 6, the drum holding device 5 moves sideways to the next work station 6. The upward movement or downward movement of the molding drum 7 is performed simultaneously. As a result, the forming drum 7 is moved laterally from the work position P of the work station 6 where the work has been completed to the standby position Q of the next work station 6 while moving upward or downward.

  In particular, in this example, the ratio Vx / Vy between the movement speed Vy of the lateral movement and the movement speed Vx of the upward movement or the downward movement is constant, so that the molding drum 7 is operated at the work position of the work station 6 where the work is finished. From P to the standby position Q of the next work station 6, it is moving diagonally at the shortest distance.

  In this way, when the work is completed at one work station 6 and the drum holding device 5 arrives at the next work station 6, the forming drum 7 is already in the standby position of the next work station 6. Moved to Q. Accordingly, at each work station 6, the forming drum 7 can be moved from the standby position Q to the work position P as soon as it arrives, and the pasting work can be started. In addition, since the forming drum is moved to the standby position Q of the next work station 6 using the lateral movement time between the work stations 66, time is wasted and the work time is shortened. You can also.

  In particular, when the molding drum 7 is moved by the shortest distance, the movement can be performed more efficiently, and the movement can be performed in a shorter time within the limited movement speeds Vy and Vx.

  From the viewpoint of ease of movement control, it is preferable that the forming drum 7 is moved laterally while moving downward from the work position P of the work station 6 where the work has been completed to the standby position Q of the next work station 6. That is, it is preferable to move the molding drum 7 with a downward inclination.

  In this case, the work position P of the previous work station 6 is sequentially set higher than the standby position Q of the next work station 6.

As shown in FIGS. 1 and 2, in each work station 6, the work position P is set higher than the standby position Q and is moved upward from the standby position Q to the work position P. When the two work positions PA ₁ , PA ₂ (that is, the first and second work positions PA ₁ , PA ₂ ) are arranged up and down in one work station 6 as in the belt forming station 6A. , after down moves the forming drum 7 from the standby position Q to the first working position PA _1, is moved on from the first working position PA ₁ to a second working position PA _2.

  In the tread formation line TL, various work stations such as a work station 6 can be formed such that a tread groove forming station can be formed on the outer surface of the tread rubber 4 on the downstream side of the tread rubber forming station 6C. Can be provided.

  In this example, the case where the tread ring T is formed on the forming drum 7 is shown. However, as the forming drum 7, a core having substantially the same configuration as the rigid core described in Patent Document 1 (having an outer shape substantially the same shape as the inner surface of the tire) can be employed. And, tire components such as inner liner rubber, carcass ply, bead core, belt ply, band ply, tread rubber, and sidewall rubber are affixed to the outer surface of the core at each work station to form a raw tire. It can also be configured as described.

  As mentioned above, although especially preferable embodiment of this invention was explained in full detail, this invention is not limited to embodiment of illustration, It can deform | transform and implement in a various aspect.

5 drum holding device 6 work station 7 forming drums 10L, 10U first and second belt ply constituent members F drum axial direction P work position PA ₁ first work position PA ₂ second work position Q standby position

Claims (5)

A step of laterally moving the drum holding device holding the forming drum rotatably in the axial direction of the drum, and affixing the tire constituent member to the forming drum at each of a plurality of work stations arranged along the track of the drum holding device. A tire forming method comprising:
The molding drum is held by the drum holding device so as to be vertically movable,
In each of the work stations, a work position and a standby position for attaching the tire constituent members are provided above and below,
When the pasting work is completed at one work station, the drum holding device moves sideways to the next work station while moving the molding drum from the work position of the work station where the work is finished to the next work. A tire forming method in which the station is moved up or down to the standby position of the station.   Since the ratio of the moving speed of the lateral movement and the moving speed of the upward movement or the downward movement is constant, the molding drum is moved from the work position of the work station where the work is completed to the standby position of the next work station. The tire forming method according to claim 1, wherein the tire is moved obliquely at the shortest distance.   The tire forming method according to claim 2, wherein the forming drum moves with the downward slope at the shortest distance. The tire constituent member includes a belt ply constituent member,
The tire forming method according to claim 1, wherein at least one of the plurality of work stations performs a belt forming step of attaching the belt ply constituent member to the forming drum. The work station that performs the belt forming step includes, as the work position, a first work position for attaching a first belt ply constituent member below the standby position, and a second belt ply above the standby position. A second working position for pasting the constituent members;
The tire forming method according to claim 4, wherein the molding drum moves down from the standby position to the first work position and then moves up from the first work position to the second work position.

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