JP2012040797A - Apparatus and method for manufacturing annular member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To certainly hold and wind a winding member around a molding drum, while inhibiting the constitution of the molding drum becoming complicated.SOLUTION: A manufacturing apparatus 1 supplies a non-vulcanizing tread 70 which is a winding member to the molding drum 2 from a feeder 3, moves a pressing member 40 by a mover 60, and fixes the pressing member 40 to a fixed position of the molding drum 2. A tip end of the non-vulcanizing tread 70 supplied to the molding drum 2 is pressed down by the pressing member 40, the molding drum 2 is rotated, and the non-vulcanizing tread 70 of which tip end is pressed down by the pressing member 40 is wound around the molding drum 2. When winding of the non-vulcanizing tread 70 is finished, the pressing member 40 is moved to a separate position separated from the molding drum 2 by the mover 60. A tread member 71 which is an annular member is manufactured by annularly winding the non-vulcanizing tread 70 around the molding drum 2.

Description

  The present invention relates to an annular member manufacturing apparatus and method for manufacturing an annular member on the outer periphery of a molding drum by winding a winding member around the molding drum in an annular shape.

  When a tire is manufactured, a tire component such as a belt or an unvulcanized tread is wound around a molding drum as a winding member, and an uncured tire is formed by placing the manufactured annular member on a molded body. Has been done.

FIG. 7 is a side view of an essential part showing a conventional unvulcanized tire molding process.
When molding an unvulcanized tire, a belt 111 (see FIG. 7A) is first wound around the outer periphery of the molding drum 100 as shown. The belt 111 is held by the forming drum 100 with an internal steel cord attracted to a magnet (not shown) in the forming drum 100.

  Next, the strip-shaped unvulcanized tread 112 is supplied from the supply device 101 to the forming drum 100, and the tip of the unvulcanized tread 112 is pressed against the belt 111 and pressure-bonded. Is held by the belt 111. Subsequently, the molding drum 100 is rotated (see FIG. 7B), the unvulcanized tread 112 is wound around the molding drum 100 once, and the ends of the unvulcanized tread 112 are joined together (see FIG. 7C). The belt tread member 110 is manufactured. Thereafter, the belt tread member 110 is removed from the forming drum 100 while being held by a holding device, and is placed on the outer periphery of the molded body to form an unvulcanized tire.

  On the other hand, for example, when manufacturing a tire for a motorcycle, an annular tread member may be formed by directly winding the unvulcanized tread 112 around the forming drum 100 without winding the belt 111 around the forming drum 100. In this motorcycle tire, the diameter of the forming drum 100 is expanded to expand the annular tread member, and the tread member is adsorbed and held from the outer periphery. Further, the tread member is conveyed while maintaining an annular shape, and is placed on a molded body to form an unvulcanized tire. However, since the unvulcanized tread 112 is made of unvulcanized rubber having no steel cord inside, even if a magnet is provided on the molding drum 100, it cannot be held on the molding drum 100. Therefore, it is difficult to wind the unvulcanized tread 112 around the molding drum 100 without arranging other tire constituent members such as the belt 111 on the molding drum 100.

  On the other hand, by imparting viscosity (tack) to the surface of the forming drum 100, the unvulcanized tread 112 can be held and wound around the forming drum 100. However, if it does in this way, the unvulcanized tread 112 will adhere strongly to the molding drum 100, and it will become difficult to remove an annular tread member from the molding drum 100. At the same time, when the tread member is expanded, the elongation accompanying expansion of the tread member is partially changed according to the degree of adhesion, and there is a possibility that the elongation of the tread member may vary. Therefore, it is desirable to form the unvulcanized tread 112 in an annular shape by using the non-viscous forming drum 100 from the viewpoint of securing the peelability from the forming drum 100 while suppressing variation in elongation. .

On the other hand, conventionally, a molding drum has been known in which a plurality of locking claws are protruded from the inside to the outside, and the tire constituent member is pierced by the locking claws to hold the sheet-like tire constituent member. (See Patent Document 1).
However, the conventional molding drum has a complicated configuration, and the tire component members that can be held are restricted, and the versatility of the molding drum tends to be reduced. Further, the unvulcanized tread 112 is difficult to stab and hold the locking claws because of characteristics such as thickness, weight, and hardness.

Further, conventionally, there is known a molding drum in which a tire-constituting member is wound around an outer peripheral surface in a state where a fixing member attached to the molding drum is rotated and the tire-constituting member is sandwiched and fixed by a fixing member (see Patent Document 2). ).
However, in this conventional molding drum, the configuration of the molding drum is complicated, and there is a possibility that the manufacturing apparatus main body including the molding drum is enlarged. In addition, when applied to an existing apparatus, remodeling is required for each molding drum, so that the cost for implementation also increases.

Furthermore, conventionally, a molding drum that sucks and holds a tire constituent member by a plurality of suction holes formed on the outer peripheral surface and winds the tire constituent member around the outer periphery is also known (see Patent Documents 3, 4, and 5).
However, in these conventional molding drums, it is difficult to reliably hold a member such as the unvulcanized tread 112, and the tire constituent members to be wound are limited. Moreover, since it is necessary to provide a suction device, piping, etc., the structure of a shaping | molding drum becomes complicated and it is difficult to ensure sufficient versatility for a shaping | molding drum. In addition, the entire apparatus is enlarged, and when applied to an existing apparatus, it is difficult to implement the apparatus because a large modification of a molding drum or the like is required.

  The forming drum is also used when various types of annular members are manufactured by winding various types of winding members in the same manner as the unvulcanized tread 112. Also when manufacturing such an annular member, it is necessary to realize the manufacture of a smooth and accurate annular member while coping with each of the problems described above. Therefore, the winding member is required to be securely held and wound around the forming drum without being restricted by the type and shape thereof.

JP 2006-264049 A JP 2006-289704 A JP 2003-154580 A JP 2006-192895 A Japanese Patent Laid-Open No. 2007-223088

  The present invention has been made in view of such a conventional problem, and the object thereof is to ensure the versatility of the forming drum by suppressing the complexity of the structure of the forming drum, and to ensure the winding member. An annular member is manufactured smoothly and accurately by being held and wound on a molding drum.

The present invention includes an annular member that includes a molding drum and a supply unit that supplies a winding member to the molding drum, and manufactures an annular member by annularly winding the winding member supplied from the supply unit around the molding drum from the tip portion. A pressing member that is fixed to a forming drum and presses the leading end of the winding member against the forming drum, and a winding member that rotates the forming drum and has the leading end pressed by the pressing member. Rotating means for winding around the drum, moving means for moving the pressing member between a fixed position on the forming drum that holds the tip of the winding member and a separated position away from the forming drum, and controlling the moving means, Control means for moving the holding member to a fixed position when the leading end of the winding member is supplied to the forming drum, and to move to a separated position when the winding of the winding member is completed. The features.
The present invention also relates to a method of manufacturing an annular member by annularly winding a winding member around a forming drum, the step of supplying the winding member to the forming drum, and fixing the pressing member to the forming drum. A step of pressing the leading end portion of the winding member supplied to the forming drum by the pressing member, and a winding member whose tip portion is pressed by the pressing member by rotating the forming drum. And a step of moving the pressing member to a separated position away from the forming drum when the winding of the winding member is finished.

  According to the present invention, the winding member can be securely held and wound around the forming drum while the versatility of the forming drum is ensured by preventing the structure of the forming drum from becoming complicated, and the annular member can be smoothly wound. Can be manufactured with high accuracy.

It is a side view which shows schematic structure of the manufacturing apparatus of the tread member of this embodiment. It is a figure which expands and shows the joining means of an unvulcanized tread. It is a side view which shows the manufacturing apparatus of the tread member which rotated the movable member. It is the front view which looked at the holding | maintenance means of the unvulcanized tread from the arrow X direction of FIG. It is the side view which looked at the position correction means of a pressing member from the arrow Z direction of FIG. It is a side view which shows the manufacture process of a tread member in order. It is a principal part side view which shows the formation process of the conventional unvulcanized tire.

Hereinafter, an embodiment of a manufacturing apparatus and a manufacturing method of an annular member of the present invention is described with reference to drawings.
The manufacturing apparatus and the manufacturing method of the annular member of the present embodiment use a forming drum, wind the winding member around the forming drum from the tip portion, and form the annular member on the forming drum. To manufacture. In the present embodiment, the case where the winding member is an unvulcanized tread and the annular member is an annular tread member will be described as an example. That is, this annular member manufacturing apparatus is a tread member manufacturing apparatus, in which a belt-shaped unvulcanized tread is directly wound around a forming drum to manufacture an annular tread member made of an unvulcanized tread.

FIG. 1 is a side view illustrating a schematic configuration of a tread member manufacturing apparatus (hereinafter, simply referred to as a manufacturing apparatus) according to the present embodiment, and a part of the apparatus is shown by dotted lines.
As shown in the figure, the manufacturing apparatus 1 includes a forming drum 2 having an axis disposed horizontally, a supply means 3 for an unvulcanized tread 70 disposed above the forming drum 2, and a control device 10 for controlling the entire apparatus. And. In addition, the manufacturing apparatus 1 includes a joining unit 20 that joins the front end portion and the rear end portion of the unvulcanized tread 70, and a holding unit 30 that holds the front end portion of the unvulcanized tread 70 on the molding drum 2. ing. The joining means 20 and the holding means 30 are installed at the distal end portion of the supply means 3, move integrally with the supply means 3, and are disposed above the molding drum 2.

  The molding drum 2 is a support that supports the unvulcanized tread 70 when the tread member is manufactured. The molding drum 2 holds the unvulcanized tread 70 arranged in a ring shape (cylindrical in this case) on the outer periphery, and holds the tread member. Molded into a ring. The forming drum 2 is supported by a driving device (not shown) which is a rotating means, and is rotationally driven by a driving source such as a motor provided in the driving device and a transmission mechanism of the rotational power. Thereby, the forming drum 2 rotates around the axis line at a predetermined rotation speed (arrow R in FIG. 1) and stops at an arbitrary rotation angle. The outer periphery of the forming drum 2 is composed of a plurality of segments (not shown) that can be displaced in the radial direction, and the plurality of segments are driven by an internal expansion / contraction mechanism to synchronize with the outer side and the inner side in the radial direction. Move. Thereby, as for the shaping | molding drum 2, an outer periphery expands and reduces a diameter, and is set to arbitrary outer diameters.

  The supply means 3 includes a transport device 3A that transports the long unvulcanized tread 70 in the longitudinal direction, and a drive device (not shown) that drives the transport device 3A to transport the unvulcanized tread 70. The conveying device 3A is composed of, for example, a belt conveyor in which an endless belt is circulated by a driving device, and is driven by the driving device to convey the unvulcanized tread 70 placed on the upper surface at a predetermined speed. Further, the conveying device 3A is installed at one end above the forming drum 2 and with a gap through which the unvulcanized tread 70 and a pressing member 40 described later can pass between the forming drum 2 and the conveying device 3A. It arrange | positions diagonally upward from one end part. The supply means 3 conveys the unvulcanized tread 70 toward the molding drum 2 by the conveying device 3A, and supplies the unvulcanized tread 70 to the molding drum 2 (arrow K in FIG. 1). At that time, the supply means 3 supplies the unvulcanized tread 70 obliquely from above along the tangential direction of the outer periphery of the molding drum 2, and synchronizes the unvulcanized tread 70 with the winding operation around the molding drum 2. And supply.

  Here, the unvulcanized tread 70 is an unvulcanized rubber member formed in a band shape, and is formed in advance in a predetermined shape and size and sent to the supply means 3. The unvulcanized tread 70 is formed into a shape and length corresponding to the shape and circumferential length of the tread member to be manufactured, for example, by cutting unvulcanized rubber extruded by an extruder with a cutter. The manufacturing apparatus 1 rotates the molding drum 2 while rotating the unvulcanized tread 70 supplied from the supply means 3 in order from the leading end of the supply to the outer periphery of the rotating molding drum 2 along the circumferential direction. Deploy. The manufacturing apparatus 1 manufactures an annular tread member by winding the unvulcanized tread 70 around the molding drum 2 in an annular shape and then joining the front end portion and the rear end portion of the unvulcanized tread 70 by the joining means 20. To do.

  The manufacturing apparatus 1 includes a pair of fixing members (side plates) 4 fixed to both side surfaces of the conveying device 3 </ b> A and a connecting member 5 fixed between the pair of fixing members 4 at the tip of the supply unit 3. Have. The connecting member 5 protrudes from between the pair of fixing members 4 toward the upper side of the forming drum 2, and the joining means 20 is attached to the tip portion to connect the joining means 20 to the fixing member 4. The joining means 20 is disposed away from the outer periphery of the molding drum 2 so as to face the outer periphery of the molding drum 2 by the connecting member 5 and not to contact the unvulcanized tread 70 supplied to the molding drum 2. Here, the joining means 20 is disposed above the axis of the molding drum 2 and at the center in the axial direction (width direction) of the molding drum 2. The joining means 20 has a pressing mechanism that presses and joins the unvulcanized tread 70 from the outside in the radial direction of the forming drum 2.

2 is an enlarged view showing the joining means 20 of the unvulcanized tread 70, FIG. 2A is a side view corresponding to FIG. 1, and FIG. 2B is a front view seen from the direction of arrow Y in FIG. 2A. FIG. 2 also shows a cross section of the forming drum 2 and an unvulcanized tread 70 (annular tread member 71) at the stage where the winding around the forming drum 2 is completed and joined.
As shown in the figure, the joining means 20 has a piston / cylinder mechanism 21 including a cylinder 22 attached to the connecting member 5 and a piston rod 23 that advances and retreats from the cylinder 22. Further, the joining means 20 includes a rectangular plate-like pressing member 24, and the pressing member 24 is fixed to the tip of the piston rod 23 and is disposed to face the joining portion 72 of the unvulcanized tread 70.

  The unvulcanized tread 70 is wound around the molding drum 2 once, and at the joining portion 72, the front end portion and the rear end portion are arranged so as to overlap or abut each other and are opposed to each other by the joining means 20. Are joined. Here, the unvulcanized tread 70 is disposed such that end surfaces formed by inclining in opposite directions abut each other and are superposed on each other. The joining means 20 moves the pressing member 24 by the piston / cylinder mechanism 21 to approach and separate the unvulcanized tread 70, and presses the pressing member 24 around the molding drum 2. Press against the joint 72 with a predetermined pressure. By this pressing member 24, the entire joining portion 72 of the unvulcanized tread 70 is sandwiched between the molding drum 2 and the front end portion and the rear end portion facing each other of the unvulcanized tread 70 are pressed and pressure-bonded. Join each other. The joining means 20 joins the end portions of the unvulcanized tread 70 over the whole to form the annular tread member 71, then separates the pressing member 24 from the joining portion 72 and ends the joining operation.

  The manufacturing apparatus 1 (see FIG. 1) includes a rectangular bar-like movable member 6 and a drive mechanism 7 that moves the movable member 6 provided in each of the pair of fixed members 4 described above. One end of the movable member 6 is fixed to a rotary shaft 8 that is rotatably attached to the tip of the fixed member 4, and is disposed above the molding drum 2 from the fixed member 4. The movable member 6 rotates in both directions around the rotation shaft 8 at one end, and the other end (free end) approaches and separates from the outer periphery of the forming drum 2. The drive mechanism 7 includes a piston / cylinder mechanism, and an end of the cylinder 7A is fixed to a rotating shaft 9A that is rotatably attached to a protruding piece 4A that protrudes above the fixing member 4. The drive mechanism 7 is disposed on the upper side of the molding drum 2 from the projecting piece 4A, and the tip of the piston rod 7B is fixed to a rotating shaft 9B that is rotatably attached to the protrusion 6A of the movable member 6. .

  When the piston / cylinder mechanism is actuated so that the piston rod 7B comes out of the cylinder 7A, the drive mechanism 7 pushes the projection 6A to rotate the movable member 6 around the rotation shaft 8, and the free end of the movable member 6 is moved to the forming drum. Approach 2 Further, when the piston rod 7B enters the cylinder 7A, the drive mechanism 7 pulls the protrusion 6A, rotates the movable member 6 around the rotation shaft 8, and separates the free end of the movable member 6 from the molding drum 2. At that time, in the drive mechanism 7, the rotation shafts 9 </ b> A and 9 </ b> B on both sides rotate according to the rotation of the movable member 6, and the arrangement angle continuously changes.

FIG. 3 is a side view showing the manufacturing apparatus 1 in which the movable member 6 is rotated with respect to the manufacturing apparatus 1 of FIG.
As shown in the figure, the drive mechanism 7 drives the movable member 6 to rotate around the rotation shaft 8, and causes the free end of the movable member 6 to approach and separate from the forming drum 2. In this manufacturing apparatus 1, the drive mechanism 7 is provided on the pair of fixed members 4, and operates in synchronization to rotate the movable member 6 of the pair of fixed members 4 in the same state. Further, the end portions of the holding means 30 are fixed to the free ends of the pair of movable members 6, respectively, and the holding means 30 approaches and separates from the forming drum 2 according to the rotation of the pair of movable members 6. To do. The pair of movable members 6 and the holding means 30 are disposed so as to surround the joining means 20 and the connecting member 5, and do not contact the joining means 20 and the connecting member 5, but rotate or displace outside them to change the state. .

4 is a front view of the holding means 30 for the unvulcanized tread 70 as seen from the direction of the arrow X in FIG.
As shown in the figure, the holding means 30 includes a horizontally long plate-like base member 31 fixed to the movable member 6, a pressing member 40 that holds the tip of the unvulcanized tread 70, and a supporting means 32 for the pressing member 40. The position correction means 50 of the pressing member 40 is provided. In FIG. 4, the forming drum 2 at the position where the pressing member 40 is disposed and the tip of the unvulcanized tread 70 pressed by the pressing member 40 are shown in cross section. In FIG. 4, the pressing member 40 in a state where the unvulcanized tread 70 is pressed is also indicated by a dotted line.

  The pressing member 40 is a member for sandwiching the tip of the unvulcanized tread 70 between the molding drum 2 and pressing it against the molding drum 2, and is formed in a square bar shape longer than the axial width of the molding drum 2. ing. In addition, the pressing member 40 includes a rectangular recess 41 formed in the central portion in the longitudinal direction, and block-shaped contact portions 42 that are provided at both ends and come into contact with the molding drum 2. The recess 41 is formed on the lower surface of the pressing member 40 in a size that matches the thickness of the unvulcanized tread 70 and wider than the width of the unvulcanized tread 70. The pressing member 40 accommodates the unvulcanized tread 70 in the recess 41 and sandwiches the unvulcanized tread 70 between the molding drum 2. The contact portion 42 is provided with a projection 43 that defines an arrangement position on the molding drum 2 and a magnet 44 that is a fixing means to the molding drum 2 on a contact surface (here, a lower surface) that contacts the outer periphery of the molding drum 2. ing.

  On the other hand, the forming drum 2 has guide holes (or guide grooves) 2A in which the projections 43 are fitted on both sides in the axial direction, and a magnetic member 2B made of an iron-based material to which the magnet 44 is attached, They are arranged adjacent to each other in the axial direction. In the molding drum 2, the circumferential position where the guide hole 2 </ b> A and the magnetic member 2 </ b> B are provided is a fixed position where the pressing member 40 is fixed, and contacts the pressing member 40 at the fixed position on the outer periphery.

  The pressing member 40 is inserted into the guide hole 2 </ b> A of the molding drum 2 when the contact portion 42 contacts the molding drum 2. Therefore, the protrusion 43 and the guide hole 2A constitute a guide means for the pressing member 40. When the pressing member 40 is moved to the fixing position of the molding drum 2, the moving pressing member 40 is moved to a predetermined position on the molding drum 2. Guide to the fixed position. In addition, the pressing member 40 is detachably fixed at a fixed position on the outer periphery of the forming drum 2 by the magnet 44 embedded in the contact portion 42 being attached to the magnetic member 2B embedded in the forming drum 2 by magnetic force. . The pressing member 40 is fixed to the forming drum 2 via the contact portion 42, and presses the leading end portion of the unvulcanized tread 70 supplied from the supply means 3 to the forming drum 2. The front end portion of the unvulcanized tread 70 is pressed by the pressing member 40 in the recess 41 and held by the molding drum 2.

  In addition, the pressing member 40 is provided with concave support portions 45 for the support means 32 to support at both end portions arranged on the outer side in the axial direction of the forming drum 2. The pressing member 40 is disposed on the molding drum 2 side (here, the lower side) of the base member 31 and is supported from below by the support means 32. The support means 32 is disposed on both outer sides of the pressing member 40 in the longitudinal direction, and is provided as a pair with the pressing member 40 interposed therebetween, and supports the pressing member 40 from both sides in the longitudinal direction. The support means 32 is composed of a piston / cylinder mechanism fixed to the end of the base member 31, and a plate-like support member 33 fixed to the piston rod is displaced in the vertical direction so that the support member 33 is held by the pressing member 40. To contact and separate. The support member 33 extends from the support means 32 to the contact portion 42 of the pressing member 40, and has an engagement protrusion 34 on the upper surface of the end portion that contacts the contact portion 42.

  The engagement protrusion 34 is an engagement means that enters and engages in the support portion 45 of the contact portion 42. The engagement protrusion 34 enters and exits the support portion 45 as the support member 33 is displaced, and engages with the support portion 45. The engagement is released. Thereby, the engaging protrusion 34 connects the support member 33 to the contact portion 42 or releases the connection between the support member 33 and the contact portion 42. A pair of support means 32 operate | moves synchronously, raises the support member 33, makes the support member 33 of both sides contact the contact part 42, and connects, The support member 33 supports the pressing member 40 from both sides. The support means 32 further raises the support member 33 while supporting the pressing member 40, and lifts the pressing member 40 away from the forming drum 2. On the other hand, when the pressing member 40 is disposed on the molding drum 2, the pair of support means 32 lowers the support members 33 on both sides to separate them from the contact portion 42 and releases the support of the pressing member 40.

  In the state where the pressing member 40 is supported by the support means 32, the manufacturing apparatus 1 displaces the holding means 30 as described above by the drive mechanism 7 and the movable member 6 to approach and separate from the molding drum 2. Further, the rotation of the molding drum 2 is stopped, and the holding means 30 is moved closer to the molding drum 2 (see FIG. 3) from a position away from the molding drum 2 (see FIG. 1). Along with this, the holding means 30 contacts the molding drum 2 with the contact portion 42 of the pressing member 40 (see FIG. 4), and the pressing member 40 is fixed to the fixing position of the molding drum 2. Subsequently, the holding unit 30 releases the support of the pressing member 40 by the supporting unit 32 by separating the support member 33 from the pressing member 40. As a result, the pressing member 40 is separated from the holding means 30 and disposed on the outer periphery of the molding drum 2. Thereafter, the pressing member 40 is integrated with the molding drum 2 while pressing and holding the tip of the unvulcanized tread 70 by the concave portion 41. Rotate.

  The manufacturing apparatus 1 rotates the molding drum 2 by the rotating means described above, and winds the unvulcanized tread 70 whose tip is pressed by the pressing member 40 around the molding drum 2. Thereby, the unvulcanized tread 70 supplied in order from the supply means 3 is wound around the forming drum 2 from the tip portion and arranged in an annular shape, and the tread member 71 is formed in an annular shape. Further, the manufacturing apparatus 1 returns the holding means 30 to the position (see FIG. 1) away from the molding drum 2 when the molding drum 2 rotates and the pressing member 40 is separated from the support member 33, and the unapplied Wait until the winding of the sulfur tread 70 is completed.

  When the winding of the unvulcanized tread 70 is completed, the manufacturing apparatus 1 brings the holding means 30 close to the forming drum 2 and returns to the position before separation, and the positions of the support member 33 and the pressing member 40 overlap. Sometimes, the rotation of the forming drum 2 is stopped. The holding unit 30 raises the supporting member 33 to contact the pressing member 40, lifts the pressing member 40 by the supporting member 33 and separates it from the molding drum 2, and supports the pressing member 40 by the supporting unit 32. Thereby, the holding means 30 separates the pressing member 40 from the unvulcanized tread 70 and collects it from the molding drum 2 to release the holding of the unvulcanized tread 70. Thereafter, the manufacturing apparatus 1 separates the holding means 30 from the molding drum 2 again and waits until the next unvulcanized tread 70 is wound.

  As described above, the movable member 6, the drive mechanism 7, the support means 32, and the like constitute a moving means for moving the pressing member 40 so as to dispose it on the molding drum 2 and collect it from the molding drum 2. . The manufacturing apparatus 1 uses this moving means to move the pressing member 40 between a fixed position on the molding drum 2 that presses the tip of the unvulcanized tread 70 and a separation position that is away from the molding drum 2. The fixing position is a position where the pressing member 40 is fixed to the forming drum 2 and the front end portion of the unvulcanized tread 70 is pressed by the pressing member 40. For example, a predetermined circumferential position of the forming drum 2 (FIG. 4). Reference) is set. Further, the separation position is a position where the pressing member 40 is disposed when the pressing member 40 is separated from the forming drum 2 and the pressing of the front end portion of the unvulcanized tread 70 is released. As the separation position, a position where the pressing member 40 does not come into contact with the unvulcanized tread 70 or the tread member 71 is set, for example, a standby position of the holding unit 30 (see FIG. 1).

  The manufacturing apparatus 1 corrects the position of the pressing member 40 by the position correcting unit 50 (see FIG. 4) after moving the pressing member 40 to the separated position by the moving unit. A pair of position correction means 50 are provided on the holding means 30 and are arranged at both ends in the longitudinal direction of the pressing member 40 and are fixed to the base member 31 so as to sandwich the contact portions 42 of the pressing member 40, respectively.

FIG. 5 is a side view of the position correction means 50 as viewed from the direction of the arrow Z in FIG. 4, and the base member 31 and the pressing member 40 are also shown in cross section.
As illustrated, the position correction means 50 includes a pair of sandwiching members 51 that sandwich the contact portion 42 of the pressing member 40 and a drive mechanism 52 to which the pair of sandwiching members 51 are connected. The pair of sandwiching members 51 are arranged on both sides of the contact portion 42, move symmetrically with the contact portion 42 interposed therebetween, and approach and separate from the contact portion 42. Further, the pair of sandwiching members 51 are arranged at the center between the projections 51 </ b> A by causing the lower end projection 51 </ b> A to contact the contact portion 42, sandwiching the contact portion 42 from both sides, and displacing the pressing member 40. The drive mechanism 52 is fixed to the upper surface of the base member 31, moves the pair of sandwiching members 51 symmetrically, and causes the sandwiching members 51 on both sides to approach and separate from the contact portion 42.

  The position correction means 50 adjusts the position of the pressing member 40 by sandwiching the pressing member 40 from both sides by a pair of clamping members 51 at both ends of the pressing member 40 and displacing the pressing member 40 toward a specified position (reference position). . Thereby, the position correction means 50 displaces the pressing member 40 at the separated position, and corrects the position of the pressing member 40 to the specified position. This specified position is a position where the pressing member 40 moved to the separation position when the pressing member 40 is separated from the molding drum 2 is set in the holding means 30 as a reference position of the separation position. .

  Next, the steps and operations for manufacturing the tread member 71 and each process of the method for manufacturing the tread member 71 will be described using the manufacturing apparatus 1 described above. The following procedures are controlled by the control device 10 (see FIG. 1), which is a control means, and executed by operating each part of the device connected to the control device 10 at preset timings and conditions. The control device 10 includes a microprocessor (MPU) 11, a ROM (Read Only Memory) 12 that stores programs for various control processes, and a RAM (Random Access Memory) 13 that temporarily stores data that the MPU 11 directly accesses. Having a microcomputer. The control device 10 controls, for example, the moving means of the pressing member 40 described above, and when the tip of the unvulcanized tread 70 is supplied to the forming drum 2, the pressing member 40 is moved from the separation position to the fixed position. (See FIG. 4). Further, when the winding of the unvulcanized tread 70 around the forming drum 2 is finished, the control device 10 removes the pressing member 40 from the forming drum 2 by the moving means and moves it from the fixed position to the separated position.

FIG. 6 is a side view sequentially illustrating the manufacturing process of the tread member 71, and schematically shows the main part of the manufacturing apparatus 1. Moreover, in FIG. 6, the manufacturing apparatus 1 is simplified and the joining means 20 is omitted. Further, in FIG. 6, a configuration for moving the pressing member 40 is also shown as a simplified moving means 60.
The manufacturing apparatus 1 first rotates the molding drum 2 and rotates the molding drum 2 when the fixing position of the molding drum 2 matches the position where the unvulcanized tread 70 is supplied from the supply means 3. Stop. Subsequently, as shown in the figure, the unvulcanized tread 70 is supplied from the supply means 3 to the forming drum 2 (see FIG. 6A), and when the tip of the unvulcanized tread 70 reaches the fixing position of the forming drum 2. Then, the conveyance of the unvulcanized tread 70 by the supply means 3 is stopped.

  Next, the pressing member 40 at the separated position is moved toward the molding drum 2 by the moving means 60 (see FIG. 6B), and the pressing member 40 is fixed to the fixing position of the molding drum 2. After the front end portion of the unvulcanized tread 70 supplied to the molding drum 2 is pressed against the molding drum 2 by the pressing member 40, the moving means 60 is returned to the original state and waited. Subsequently, the conveyance of the unvulcanized tread 70 by the supply unit 3 is restarted, and at the same time, the molding drum 2 is rotated (see FIG. 6C). At that time, the supply speed of the unvulcanized tread 70 and the speed of the outer peripheral surface of the molding drum 2 are matched. Thereby, the pressing member 40 is rotated and moved integrally with the molding drum 2, and the unvulcanized tread 70 whose tip is pressed by the pressing member 40 is wound around the molding drum 2. The unvulcanized tread 70 is wound in the circumferential direction of the molding drum 2 and is annularly arranged on the outer periphery of the molding drum 2.

  When the winding of the unvulcanized tread 70 around the molding drum 2 is completed, the manufacturing apparatus 1 moves the pressing member 40 at the fixed position to the separated position away from the molding drum 2 by the moving means 60 (see FIG. 6D). ). However, here, the end portions of the annular unvulcanized tread 70 wound around the forming drum 2 are arranged so as to face each other, and the joining means 20 (see FIG. 2) and the facing tip portion of the unvulcanized tread 70 are opposed to each other. The rear ends are pressed to join the ends together. Subsequently, the pressing member 40 that has made one round is moved to the separation position and is separated from the unvulcanized tread 70. Further, the position correction means 50 (see FIG. 5) displaces the pressing member 40 moved to the separated position, and corrects the position of the pressing member 40 to the specified position. Thereafter, the pressing member 40 is kept waiting at the separated position until the next unvulcanized tread 70 is wound.

  In this way, the manufacturing apparatus 1 manufactures the annular tread member 71 by winding the unvulcanized tread 70 around the molding drum 2 in an annular shape. When manufacturing a tire for a motorcycle, the diameter of the forming drum 2 is expanded to expand the tread member 71 to a predetermined diameter, and the tread member 71 is held from the outer periphery by a tread holding device (not shown). Remove from. The tread member 71 is conveyed while maintaining an annular shape, placed on a molded body to form an unvulcanized tire, and the unvulcanized tire is vulcanized to produce a tire.

  As described above, in the manufacturing apparatus 1 of the present embodiment, when the unvulcanized tread 70 is wound around the molding drum 2, the pressing member 40 that is movable between the fixing position and the separation position of the molding drum 2 is not used. Press the tip of the vulcanized tread 70. Therefore, the unvulcanized tread 70 can be easily and reliably held on the molding drum 2 without imparting viscosity or the like to the surface of the molding drum 2, and the unvulcanized tread 70 being wound is prevented from falling from the molding drum 2. it can. Accordingly, since the unvulcanized tread 70 is directly and accurately wound around the outer periphery of the forming drum 2, the tread member 71 having a high accuracy such as a shape can be manufactured smoothly.

  Further, the pressing member 40 can be reliably fixed to the molding drum 2 simply by providing the guide hole 2A (see FIG. 4) and the magnetic member 2B at the fixing position of the molding drum 2. Therefore, the configuration of the molding drum 2 becomes complicated, or the molding drum 2 and the manufacturing apparatus 1 can be prevented from being enlarged, and sufficient versatility can be secured for the molding drum 2. In addition, when applied to an existing apparatus, the molding drum 2 can be easily remodeled, and the holding means 30 and the like need only be added to the supply means 3, for example. Cost can be reduced.

  Therefore, according to the present embodiment, the unvulcanized tread 70 that is a winding member is securely attached to the molding drum 2 while suppressing the complexity of the configuration of the molding drum 2 to ensure versatility of the molding drum 2. Can be held and wound. Moreover, the tread member 71 which is an annular member can be manufactured smoothly and accurately. Furthermore, since it is possible to prevent the unvulcanized tread 70 from strongly adhering to the forming drum 2, it is possible to secure the peelability of the tread member 71 and to easily remove the tread member 71 from the forming drum 2. When the tread member 71 is expanded as described above, the uniformity of elongation associated with the expansion of the tread member 71 is increased, and variation in elongation can be suppressed.

  In this manufacturing apparatus 1, since the pressing member 40 is guided to the fixed position on the molding drum 2 by the guide means including the protrusion 43 of the pressing member 40 and the guide hole 2 </ b> A of the molding drum 2, the pressing member 40 is accurately positioned at the fixed position. Can be fixed. As a result, the front end portion of the unvulcanized tread 70 can be reliably pressed and held by the pressing member 40. Moreover, since the pressing member 40 can be repeatedly fixed to the forming drum 2 in the same state, the tip of the unvulcanized tread 70 can be pressed repeatedly and accurately. However, the guide means may be configured to be different from the above, such as configured by a guide hole formed in the pressing member 40 and a protrusion formed in the molding drum 2.

  The joining means 20 presses and joins the end portions of the unvulcanized tread 70 to increase the joining strength and stably maintain the tread member 71 in an annular shape. By providing the position correction means 50 in the manufacturing apparatus 1 and correcting the position of the pressing member 40 as described above, when the pressing member 40 is repeatedly arranged on the molding drum 2, the position of the pressing member 40 is set. The accuracy can be increased and the unvulcanized tread 70 can be accurately pressed.

  The example in which the unvulcanized tread 70 is wound around the forming drum 2 has been described above. However, according to the annular member manufacturing apparatus of the present invention, various winding members can be securely attached without being restricted by type, shape, or the like. And can be wound around the forming drum 2. As the winding member, various members wound around the forming drum 2 in the same manner as described above, such as a member constituting a part of the tread rubber and other tire constituent members, can be employed. Therefore, in addition to the tread member 71, the annular member manufacturing apparatus can manufacture various annular members that are formed into an annular shape (for example, a circular shape, a cylindrical shape, or a cylindrical shape) by the winding member. Even in this case, the above-described effects can be obtained, and each annular member can be manufactured smoothly and accurately. Moreover, since the restriction | limiting of a winding member and an annular member reduces, the versatility of a forming drum can be made high.

  DESCRIPTION OF SYMBOLS 1 ... Manufacturing apparatus of a tread member, 2 ... Forming drum, 2A ... Guide hole, 2B ... Magnetic member, 3 ... Supply means, 3A ... Conveying device, 4 ... Fixed Member, 4A ... projecting piece, 5 ... connecting member, 6 ... movable member, 7 ... drive mechanism, 7A ... cylinder, 7B ... piston rod, 8, 9 ... rotation Axis, 10 ... control device, 11 ... MPU, 12 ... ROM, 13 ... RAM, 20 ... joining means, 21 ... piston / cylinder mechanism, 22 ... cylinder, 23 ... Piston rod, 24 ... Pressing member, 30 ... Holding means, 31 ... Base member, 32 ... Supporting means, 33 ... Support member, 34 ... engaging protrusion, 40 ... holding member, 41 ... concave portion, 42 ... contact portion, 43 ... projection, 44 ... magne , 45... Support part, 50... Position correction means, 51... Pinching member, 51 A... Projection, 52 ... drive mechanism, 60. Vulcanized tread, 71... Tread member, 72.

Claims (7)

An apparatus for manufacturing an annular member, comprising: a forming drum; and a supply means for supplying a winding member to the forming drum, wherein the winding member supplied from the supply means is wound around the forming drum in an annular shape from the tip portion. There,
A holding member fixed to the forming drum and holding the leading end of the winding member against the forming drum;
Rotating means for rotating the molding drum and winding the winding member whose tip is pressed by the pressing member around the molding drum;
Moving means for moving the pressing member between a fixed position on the molding drum that presses the tip of the winding member and a spaced position away from the molding drum;
Control means for controlling the moving means to move the pressing member to a fixed position when the leading end of the winding member is supplied to the forming drum and to move to the separation position when the winding of the winding member is completed; ,
An apparatus for manufacturing an annular member, comprising: In the manufacturing apparatus of the annular member according to claim 1,
An apparatus for manufacturing an annular member, comprising position correction means for displacing a pressing member at a separation position to correct the position of the pressing member to a specified position. In the manufacturing apparatus of the annular member according to claim 1 or 2,
An annular member manufacturing apparatus comprising guide means for guiding the pressing member toward a fixed position on the molding drum. In the manufacturing apparatus of the annular member according to any one of claims 1 to 3,
An apparatus for manufacturing an annular member, comprising joining means for joining the ends by pressing the front end and the rear end facing each other of the winding member wound around the forming drum. An annular member manufacturing method for manufacturing an annular member by annularly winding a winding member around a forming drum,
Supplying a winding member to the forming drum;
Fixing the pressing member to the fixing position of the molding drum, and pressing the tip of the winding member supplied to the molding drum by the pressing member;
A step of rotating the molding drum and winding the winding member, the tip of which is pressed by the pressing member, around the molding drum;
When the winding of the winding member is finished, the step of moving the pressing member to a separated position away from the forming drum;
The manufacturing method of the annular member characterized by having. In the manufacturing method of the annular member according to claim 5,
A method of manufacturing an annular member, comprising: a step of displacing the pressing member moved to the separation position to correct the position of the pressing member to a specified position. In the manufacturing method of the annular member according to claim 5 or 6,
The manufacturing method of the annular member characterized by having the process of pressing the front-end | tip part and rear-end part which the winding member wound around the forming drum opposes, and joining edge parts.

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