JP4962833B2 - Molding drum - Google Patents

Description

  The present invention relates to a forming drum that is formed into a cylindrical shape by winding a sheet-like member such as an inner liner member, a carcass member, or a sidewall member in a manufacturing process of a pneumatic tire for an automobile, for example.

  In general, this type of forming drum includes a plurality of drum members arranged in the circumferential direction of the forming drum and forming the outer peripheral surface of the forming drum, and a moving mechanism that moves each drum member in the radial direction of the forming drum. In addition, it is known that the outer peripheral surface of the forming drum is formed in a predetermined shape by providing each drum member with predetermined unevenness according to the winding position of the sheet-like member (see, for example, Patent Document 1). .

  By the way, the outer peripheral surface shape of the molding drum needs to be changed according to the type of tire to be molded, but in the molding drum, each drum member needs to be replaced to change the outer peripheral surface shape, Since replacement of each supported drum member takes time, there is a problem that the outer peripheral surface shape of the forming drum cannot be changed in a short time. In addition, since a plurality of types of drum members are required depending on the type of tire, there is a problem that the manufacturing cost is high.

Further, as other molding drums, a plurality of first drum members arranged in the circumferential direction of the molding drum and forming a part of the outer peripheral surface of the molding drum, and the outer side of the molding drum in the radial direction on each first drum member A plurality of second drum members fixed by bolts to form other portions of the outer peripheral surface of the molding drum, and a moving mechanism for moving each first drum member in the radial direction of the molding drum. It is known that the shape of the outer peripheral surface of the forming drum is changed by exchanging members to reduce the manufacturing cost (for example, see Patent Document 2).
JP 2003-71950 A Special table 2003-532566 gazette

  However, in the latter forming drum, since each second drum member is fixed to each first drum member by a bolt, it takes a long time to attach and detach the bolt, and the outer peripheral surface shape of the forming drum is changed in a short time. There was a problem that it was not possible.

  The present invention has been made in view of the above problems, and an object of the present invention is to form a molding drum capable of changing the outer peripheral surface shape of the molding drum in a short time and reducing the manufacturing cost. Is to provide.

  In order to achieve the above-mentioned object, the present invention provides an expandable / contractible molding drum in which a sheet-like member is wound and molded into a cylindrical shape, and is arranged in the circumferential direction of the molding drum to form a part of the outer peripheral surface of the molding drum. A plurality of first drum members, a plurality of second drum members that are attached to the first drum members so as to come into contact with each of the first drum members from the outside in the radial direction, and form other portions of the outer peripheral surface of the molding drum, Each of the first drum members is provided with an insertion hole extending from the outside in the radial direction toward the inside of the forming drum, and each second drum member is provided with the second drum member as the first drum member. When contacted from the outside in the direction, the second drum member is inserted into the insertion hole of the first drum member from the outside in the radial direction of the forming drum, and the second drum member is in contact with the first drum member in the state where the second drum member is in contact with the first drum member. If the first drum member is moved in one axial direction of the molding drum, the first drum member is locked to the first drum member, and the second drum member is locked to the first drum member. And a movement restricting mechanism capable of restricting movement of the second drum member relative to the first drum member in the axial direction of the forming drum.

  Thereby, the outer peripheral surface of the forming drum is formed by each first drum member and each second drum member, and the engaging portion of the second drum member is inserted into the insertion hole of the first drum member to engage with the first drum member. Since the second drum member is attached to the first drum member by restricting the axial movement of the second drum member relative to the first drum member by the movement restricting mechanism, the second drum member is attached to the first drum member. It can be easily attached to and detached from the first drum member. Moreover, since the outer peripheral surface shape of the forming drum can be changed by replacing each second drum member, for example, when used for manufacturing a tire, it is not necessary to change the first drum member according to the type of the tire.

  According to the present invention, since each second drum member can be easily attached to and detached from each first drum member, the outer peripheral surface shape of the forming drum can be changed in a short time by replacing each second drum member. Also, for example, when used in the manufacture of tires, there is no need to change the first drum member according to the type of tire. This is extremely advantageous for reduction.

  1 to 6 show an embodiment of the present invention. FIG. 1 is a perspective view of a forming drum, FIG. 2 is a perspective view of a main part of the forming drum, and FIGS. 3 to 5 are views for attaching a second drum member. FIG. 6 is a side cross-sectional view of the main part of the forming drum when the second drum member is removed.

  The molding drum of the present embodiment has a first drum member 10 arranged in the circumferential direction so as to form a part of the outer peripheral surface of the molding drum, and each first drum member 10 is contacted from the outside in the radial direction of the molding drum. A plurality of second drum members 20 that are attached so as to be in contact with each other and form other portions of the outer peripheral surface of the molding drum, and the movement of the second drum member 20 relative to the first drum member 10 in the axial direction of the molding drum can be regulated. The movement restriction mechanism 30 is provided. Examples of the forming drum include a band forming drum that forms a band member by winding an inner liner member, a carcass member, and a sidewall member, and a belt forming drum that forms a belt member by winding a belt member and a tread member.

  Each first drum member 10 is composed of a plate-like member extending in the axial direction of the molding drum, and is supported by a moving mechanism (not shown) on the radially inner side of the molding drum. The moving mechanism can move each first drum member 10 in the radial direction of the molding drum, and the molding drum expands and contracts by the movement of each first drum member 10. Each first drum member 10 is provided with an insertion hole 11 penetrating the first drum member 10 in the radial direction of the molding drum and a locking groove 12 extending from the insertion hole 11 in the axial direction of the molding drum. The insertion hole 11 is a rectangular hole formed long in the axial direction of the forming drum. The locking groove 12 opens to the inside in the radial direction of the molding drum and opens to the insertion hole 11 side.

  Each second drum member 20 is composed of a plate-like member extending in the axial direction of the molding drum, and both axial end portions of the molding drum are inclined inward in the radial direction of the molding drum toward the outer side in the axial direction. Each second drum member is provided with a locking member 21 on the radially inner side of the forming drum. The locking member 21 includes a radially extending portion 21a that extends inward in the radial direction of the molding drum, and an axially extending portion 21b that extends from the tip of the radially extending portion 21a toward one axial direction of the molding drum. Have The axially extending portion 21b extends toward one axial direction of the forming drum at a predetermined interval from the second drum member 20. The tip end portion of the axially extending portion 21b is inclined inward in the radial direction of the forming drum toward the tip end. Each second drum member 20 is provided with an engagement hole 20a penetrating in the vertical direction.

  The locking member 21 can be inserted into the insertion hole 11 of the first drum member 10 from the outside in the radial direction of the forming drum. The engaging member 21 is inserted into the insertion hole 11 (see FIG. 3), and the second drum member 20 is moved in one axial direction of the forming drum with respect to the first drum member 10 (see FIG. 4). The stop member 21 is inserted into the locking groove 12 of the first drum member 10. The axially extending portion 21 b of the locking member 21 is formed along the locking groove 12 of the first drum member 10. When the locking member 21 is inserted into the locking groove 12, the locking member 21 is in contact with the first drum member 10 so that the second drum member 20 contacts the first drum member 10 from the outside in the radial direction of the forming drum. (See FIG. 5). Further, the locking member 21 and the locking groove 12 are locked in the circumferential direction of the forming drum.

  The movement restricting mechanism 30 is provided in each first drum member 10. Each movement restricting mechanism 30 is a well-known engagement pin 31 as an engagement member for inserting the first drum member 10 in the radial direction of the molding drum, and urging the engagement pin 31 outward in the radial direction of the molding drum. And a case 33 for supporting the spring 32 from the radially inner side of the forming drum.

  The engaging pin 31 passes through the first drum member 10 in the radial direction of the molding drum, and one end thereof protrudes from the first drum member 10 to the outer side in the radial direction of the molding drum, and the other end of the cylindrical portion 31a. A spring 32 and a flange portion 31b that abuts in the radial direction of the forming drum are provided. When the engagement pin 31 is biased by the spring 32, one end of the cylindrical portion 31 a protrudes from the first drum member 10 to the outside in the radial direction of the forming drum. When the locking member 21 of the second drum member 20 is inserted to a predetermined position in the locking groove 12, the engagement pin 31 is inserted into the engagement hole 20 a of the second drum member 20.

  The case 33 is fixed to the first drum member 10 from the inside in the radial direction of the forming drum.

  In the molding drum configured as described above, when attaching the second drum member 20 to the first drum member 10, first, the locking member 21 of the second drum member 20 is inserted into the insertion hole 11 of the first drum member 10. The second drum member 20 is brought into contact with the first drum member from the outer side in the radial direction of the molding drum so as to be inserted from the outer side in the radial direction of the molding drum (see FIG. 3). Next, the second drum member 20 is moved in one axial direction of the forming drum with respect to the first drum member 10. As a result, the axially extending portion 21b of the locking member 21 is inserted into the locking groove 12, and the axially extending portion 21b of the locking member 21 is engaged with the first drum member 10 from the inside in the radial direction of the forming drum. Stop (see FIG. 4). When the axially extending portion 21 b of the locking member 21 is inserted to a predetermined position in the locking groove 12, the engagement pin 31 of the movement restricting mechanism 30 is inserted into the engagement hole 20 a of the second drum member 20. The movement of the second drum member 20 relative to the first drum member 10 in the axial direction of the forming drum is restricted (see FIG. 5).

  Next, when removing the second drum member 20 from the first drum member 10, the second drum member 20 is moved to the first drum while pushing the engaging pin 31 of the movement restricting mechanism 30 toward the inside in the radial direction of the forming drum. The member 10 is moved to the other axial direction of the forming drum (see FIG. 6). The engagement pin 31 can be pushed by the shaft 22 having an outer diameter smaller than the inner diameter of the engagement hole 20 a of the second drum member 20. Accordingly, the engagement between the engagement pin 31 and the engagement hole 20a is released, and the second drum member 20 can be detached from the first drum member 10.

  Thus, according to this embodiment, the outer peripheral surface of the forming drum is formed by the first drum member 10 and the second drum member 20, and the locking member 21 of the second drum member 20 is connected to the first drum member 10. The first drum member 10 is inserted into the insertion hole 11 to be locked from the inside in the radial direction of the molding drum, and the movement of the first drum member 10 and the second drum member 20 in the axial direction is restricted by the movement restriction mechanism 30. Thus, since the second drum member 20 is attached to the first drum member 10, each second drum member 20 can be easily attached to and detached from each first drum member 10, and each second drum member 20 can be replaced. Thus, the outer peripheral surface shape of the forming drum can be changed in a short time. Moreover, since the outer peripheral surface shape of the forming drum can be changed by replacing the second drum member 20, it is not necessary to change the first drum member according to the type of tire. Therefore, it is extremely advantageous to improve productivity and reduce the manufacturing cost of the molding drum when a large variety of tires are produced in small quantities.

  Further, the locking member 21 extends in one axial direction of the forming drum at a predetermined interval from the second drum member 20 and can be locked to the first drum member 10 from the inside in the radial direction of the forming drum. Since the extending portion 21b is provided, the locking member 21 can be simplified in structure, which is advantageous in reducing the manufacturing cost of the forming drum.

  In addition, the movement restricting mechanism 30 is provided so that one end thereof can project radially outward from the first drum member 10, and is formed from the engagement hole 20 a of the second drum member 20 by projecting from the first drum member 10. Since the engagement pin 31 that can be engaged in the axial direction of the drum and the spring 32 that urges the engagement pin 31 toward the outside in the radial direction of the forming drum are configured, The movement of the second drum member 20 in the axial direction can be reliably restricted, which is advantageous in reducing the manufacturing cost of the forming drum.

  In the present embodiment, the first drum member 10 is provided with the insertion hole 11 penetrating in the radial direction of the forming drum, but even when the insertion hole 11 does not penetrate the first drum member 10, If the insertion hole 11 is provided so as to extend from the outer side in the radial direction of the molding drum to the inner side, and the locking groove 12 is provided so as to extend from the insertion hole 11 in the axial direction of the molding drum, the second drum member Twenty locking members 21 can be locked to the first drum member 10.

  In the present embodiment, the movement restricting mechanism 30 is provided on the first drum member 10. However, as shown in FIGS. 7 and 8, the movement restricting mechanism 40 may be provided on the second drum member 20. Is possible.

  In this case, the movement restricting mechanism 40 has an engagement pin 41 as an engagement member whose one end can protrude from the second drum member 20 to the inside in the radial direction of the forming drum, and the engagement pin 41 at the inside in the radial direction of the forming drum. And a spring 42 as a biasing member made of a well-known coil spring that biases toward the front. On the other hand, the first drum member 10 is provided with an engagement hole 10a into which one end of the engagement pin 41 can be inserted from the outside in the radial direction of the forming drum. When the locking member 21 of the second drum member 20 is inserted to a predetermined position in the locking groove 12, one end of the engagement pin 41 is inserted into the engagement hole 10a, and the engagement pin 41 is engaged with the engagement hole 10a. To the axial direction of the forming drum. Thereby, the movement of the first drum member 10 and the second drum member 20 in the axial direction of the molding drum can be reliably restricted by a simple structure, which is advantageous in reducing the manufacturing cost of the molding drum. is there.

  Further, it is possible to provide the second drum member 20 with a movement restricting mechanism 50 constituted by a known ball plunger 51.

  In this case, the ball plunger 51 is fixed to the second drum member 20, and the ball 51 a of the ball plunger 51 can protrude from the second drum member 20 to the inside in the radial direction of the forming drum. On the other hand, the first drum member 10 is provided with a concave portion 10b that can be engaged with the ball 51a of the ball plunger 51 in the axial direction of the forming drum. When the locking member 21 of the second drum member 20 is inserted to a predetermined position in the locking groove 12, the ball 51a of the ball plunger 51 is engaged with the concave portion 10b. Thereby, the movement of the first drum member 10 and the second drum member 20 in the axial direction of the molding drum can be reliably restricted by a simple structure, which is advantageous in reducing the manufacturing cost of the molding drum. is there.

  Further, when a force in the axial direction of the forming drum is applied to the second drum member 20, the ball 51 of the ball plunger 51 moves outward in the radial direction of the forming drum by the inclined surface of the concave portion 10b, and the ball 51a and the concave portion 10b. And the second drum member 20 can be exchanged in a shorter time.

The perspective view of the forming drum which shows one Embodiment in this invention Perspective view of main part of molding drum Side sectional view of the main part of the forming drum when the second drum member is attached Side sectional view of the main part of the forming drum when the second drum member is attached Side sectional view of the main part of the forming drum when the second drum member is attached Side surface sectional view of the main part of the forming drum when the second drum member is removed Side surface sectional drawing of the principal part of the forming drum which shows the modification of the movement control mechanism in this embodiment. Side surface sectional drawing of the principal part of the forming drum which shows the modification of the movement control mechanism in this embodiment. Side surface sectional drawing of the principal part of the forming drum which shows the other modification of the movement control mechanism in this embodiment. Side surface sectional drawing of the principal part of the forming drum which shows the other modification of the movement control mechanism in this embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... 1st drum member, 10a ... Engagement hole, 10b ... Recessed part, 11 ... Insertion hole, 12 ... Locking groove, 20 ... 2nd drum member, 21 ... Locking member, 21a ... Radially extending part, 21b: Axial extending portion, 30: Movement restriction mechanism, 31 ... Engagement pin, 31a ... Columnar part, 31b ... Flange part, 32 ... Spring, 33 ... Case, 40 ... Movement restriction mechanism, 41 ... Engagement pin, 42 ... Spring, 50 ... Movement restriction mechanism, 51 ... Ball plunger, 51a ... Ball.

Claims (4)

In an expandable / contractible forming drum that winds a sheet-like member and forms it into a cylindrical shape,
A plurality of first drum members arranged in a circumferential direction of the molding drum and forming a part of an outer circumferential surface of the molding drum;
A plurality of second drum members that are attached to the respective first drum members so as to come into contact with each other from the outside in the radial direction of the molding drum, and form other portions of the outer peripheral surface of the molding drum;
An insertion hole provided in each first drum member, extending from the outside in the radial direction of the forming drum toward the inside;
Provided in each second drum member, and when the second drum member is brought into contact with the first drum member from the outside in the radial direction of the molding drum, the insertion hole of the first drum member is inserted from the outside in the radial direction of the molding drum, When the second drum member is moved in one axial direction of the molding drum with respect to the first drum member while the second drum member is in contact with the first drum member, the first drum member is moved from the radially inner side of the molding drum. A locking portion for locking;
A movement restricting mechanism capable of restricting movement of the second drum member relative to the first drum member in the axial direction of the forming drum in a state where the engaging portion of the second drum member is engaged with the first drum member; A forming drum characterized by that. The locking portion is provided with an axially extending portion that extends in one axial direction of the forming drum at a predetermined interval from the second drum member, and that can be locked to the first drum member from the radially inner side of the forming drum. The forming drum according to claim 1. The movement restricting mechanism is provided so as to be able to protrude from the first drum member toward the outside in the radial direction of the forming drum, and when the protrusion is protruded from the first drum member, the second drum member and the forming drum can be engaged in the axial direction. The forming drum according to claim 1 or 2, comprising a member and an urging member that urges the engaging member toward a radially outer side of the forming drum. The movement restricting mechanism is provided so as to be able to protrude from the second drum member toward the inside in the radial direction of the forming drum, and when it protrudes from the second drum member, the first drum member and the forming drum can be engaged in the axial direction. The forming drum according to claim 1 or 2, comprising a member and an urging member that urges the engaging member toward a radially inner side of the forming drum.

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