JP2008162071A - Holding method of cylindrical rubber member and device thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To securely hold a cylindrical rubber member 17 which has small irregular shapes on the outer periphery and a short axial length from the outside while a structure is simple and small, and low in cost. <P>SOLUTION: The cylindrical rubber member 17 is held from the outside by a holding member 47 showing an annular shape as a whole. In that case, since the inner periphery of the holding member 47 (holding segment 46) is a mirror surface, an adhesive force or the like acts on a surface on which the holding member 47 and the cylindrical rubber member 17 are firmly attached to each other and the cylindrical rubber member 17 is surely held by the holding member 47, even though there are small irregular shapes on the outer periphery of the cylindrical rubber member 17 or a part of the holding member 47 is projected from the axial end of the cylindrical rubber member 17. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

    The present invention relates to a gripping method and apparatus for gripping a cylindrical rubber member from the outside.

As a conventional gripping method and apparatus for a cylindrical rubber member, for example, the one described in Patent Document 1 below is known.
JP 2000-202924 A

  This is supported by a ring-shaped frame, a plurality of holders that are movably supported in the radial direction on the frame, equidistant from each other in the circumferential direction, and the radial inner ends of these holders. A plurality of arcuate bodies that have an annular shape and are provided with a plurality of suction pads that can be connected to a vacuum source on the inner periphery, and a cylindrical shape in which the holder is synchronously moved radially inward and loosely fitted in a frame An approach means for approaching the rubber member to the arcuate body, the arcing body is brought close to the cylindrical rubber member by the approaching means, and the axial end portions of the cylindrical rubber member are sucked and held from the outside by the suction pads, respectively. It is a thing.

    However, in such a conventional method and apparatus for gripping a cylindrical rubber member, when small irregularities exist on the outer periphery of the cylindrical rubber member, for example, a ribbon-like piece extending in the axial direction is supplied to the molding drum. Since the cylindrical rubber member is formed by sticking one after another while shifting in the circumferential direction by a distance slightly shorter than the width of the ribbon-shaped piece on the outer periphery, a number of steps extending in the axial direction are formed on the outer periphery. In such a case, even if the suction pad is pressed against the cylindrical rubber member, a slight gap is generated between them, so that outside air flows from the gap during suction gripping. As a result, the suction gripping force by the suction pad is reduced. There has been a problem that the cylindrical rubber member is partially deformed, for example, the upper side portion hangs down, or the gripping may fail in some cases.

  In addition, when the axial length of the cylindrical rubber member to be gripped is short, a part of the suction pad may protrude outward from the axial end of the cylindrical rubber member. A slight gap occurs between the suction pad and the cylindrical rubber member, reducing the suction gripping force, and the axial end of the cylindrical rubber member is partially deformed or fails to grip as before. There was also a problem that sometimes happened. Furthermore, when the suction pad as described above is used, a vacuum source, a hose and the like are required, and there is a problem that the structure is complicated, large and expensive.

  The present invention provides a method for gripping a cylindrical rubber member that can be securely gripped from the outside even with a cylindrical rubber member that has a simple structure, is small and inexpensive, and has small irregularities on the outer periphery or a short axial length. And an object to provide an apparatus.

    The purpose of this is as follows. First, a cylindrical rubber member is loosely fitted in a gripping member that is supported by a frame and has an annular shape as a whole and is a mirror surface. A cylindrical rubber comprising a step of gripping the cylindrical rubber member from the outside by the gripping member by bringing the member relatively close to each other and bringing the outer periphery of the cylindrical rubber member into close contact with the inner periphery of the gripping member This can be achieved by the method of gripping the member.

  Secondly, the frame, the gripping member supported by the frame and having an annular shape as a whole and having a mirror inner surface, the cylindrical rubber member loosely fitted in the gripping member, and the gripping member relatively approach each other And holding the cylindrical rubber member with an approach means for gripping the cylindrical rubber member from the outside by the gripping member by closely contacting the outer periphery of the cylindrical rubber member and the inner periphery of the gripping member. This can be achieved with the device.

  In the present invention, the cylindrical rubber member is gripped from the outside by making the inner periphery of the gripping member having an annular shape as a mirror surface and closely contacting the inner periphery of the gripping member and the outer periphery of the cylindrical rubber member. Therefore, although the structure is simple, small and inexpensive, even if there are small irregularities on the outer periphery of the cylindrical rubber member, or even if a part of the gripping member protrudes from the axial end of the cylindrical rubber member, Since the adhesive force or the like acts on the surface where the gripping member and the cylindrical rubber member are in close contact with each other, the cylindrical rubber member can be reliably gripped from the outside by the gripping member.

  Further, in the cylindrical rubber member, the axial end portion is more easily deformed than the axial central portion, and if the portion is deformed, it becomes an obstacle in a later process. If the part is securely gripped, the above situation can be prevented. Furthermore, if comprised as described in Claim 4, a cylindrical rubber member can be firmly hold | gripped. Moreover, if comprised as described in Claim 5, durability of a holding member can be improved simply and cheaply.

  Furthermore, if comprised as described in Claim 6, the cylindrical rubber member from which size (diameter) differs can be hold | gripped easily. Further, according to the seventh aspect, even a cylindrical rubber member having a different size (diameter) or a slightly deformed shape can be easily gripped by the gripping member. it can. Furthermore, if comprised as described in Claim 8, each gripping segment can be swung easily and inexpensively.

  According to the ninth aspect of the present invention, the gripping of the cylindrical rubber member by the gripping member is performed auxiliary by suction using a vacuum, and the gripping is further ensured. Furthermore, if comprised as described in Claim 10, the cylindrical rubber member can be easily and reliably released from the gripping member. In addition, if the connection hole is shared for both adsorption and release as described in claim 11, the structure becomes simple and it can be manufactured at low cost.

Embodiment 1 of the present invention will be described below with reference to the drawings.
In FIGS. 1, 2 and 3, reference numeral 11 denotes a guide rail extending on the floor surface 12 and extending in the front-rear direction. A plurality of slide bearings 14 fixed to the lower surface of the drive unit 13 slide on the guide rail 11. Engagement possible. The driving portion 13 supports a base end portion (rear end portion) of a cylindrical forming drum 15 extending horizontally toward the front. The forming drum 15 receives a driving force from the driving portion 13 and rotates around its axis. Can be rotated.

  Further, the forming drum 15 incorporates expansion / contraction means as an approach means including a link or the like (not shown). When a driving force is applied to the expansion / contraction means (access means) from the drive unit 13, the forming drum 15 15 can be scaled. The drive unit 13 and the forming drum 15 can move in the front-rear direction while being guided by the guide rail 11 by receiving a driving force from a driving mechanism (not shown) such as a cylinder or a screw mechanism.

  Then, when the molding drum 15 is in a reduced diameter state, a rubber sheet configured by joining the unvulcanized rubber strips in advance while shifting in the width direction on the conveyor or the transfer drum is wound around the molding drum 15. After forming the cylindrical inner liner, a small number of reinforcing cords are coated with unvulcanized rubber, and an axially extending ribbon-like piece is supplied to the forming drum 15 and is slightly shorter than the width of the ribbon-like piece. A cylindrical carcass ply is formed by affixing one after another while shifting in the circumferential direction, thereby forming a cylindrical rubber member 17 called a carcass band consisting of these inner liner and carcass ply on the outer periphery of the forming drum 15. To do. Here, the cylindrical rubber member may be a band composed of only the inner liner or only the carcass ply.

  On the outer periphery of the cylindrical rubber member 17 formed in this way, especially the carcass ply, small unevenness, that is, a large number of steps extending in the axial direction, is formed due to the overlapping of both ends in the width direction of adjacent ribbon-like pieces. The After that, the cylindrical rubber member 17 is brought into close contact with a gripping member described later by the molding drum 15 being expanded in diameter by the expansion / contraction means (approaching means), and the outer periphery thereof is pressed against the inner periphery of the gripping member. .

  In addition, the cylindrical rubber member described above is formed by supplying and winding a sheet body made of unvulcanized rubber around a molding drum and joining the start and end of the inner liner to form an inner liner, and then a large number parallel to the axis of the molding drum. It may be configured by forming a carcass ply by feeding and winding a sheet body coated with a reinforcing cord of a rubber to a forming drum and joining the start and end ends thereof. It may be configured by winding and stacking one or more sheets. In this case as well, small irregularities are formed on the outer periphery of the cylindrical rubber member due to the above-described joints and disturbance of the reinforcing cord.

  18 is a transfer device installed in front of the forming drum 15. The transfer device 18 is a horizontal rectangular plate-like shape having a plurality of slide bearings 19 slidably engaged with the guide rail 11 fixed to the lower surface. A holding device 21 is provided on the base 20 for receiving the cylindrical rubber member 17 from the molding drum 15 at the receiving position U and holding it from the outside. The transfer device 18 can move in the front-rear direction while being guided by the guide rail 11 by receiving a driving force from a driving mechanism (not shown).

  A drive unit 22 is installed on the floor surface 12 in front of the receiving position U, and the drive unit 22 supports a base end portion (front end portion) of a forming drum 23 extending horizontally rearward. The molding drum 23 is coaxial with the molding drum 15 and can rotate around the axis line by receiving a driving force from the driving unit 22. When the gripping device 21 (transfer device 18) gripping the cylindrical rubber member 17 as described above moves to the delivery position M surrounding the molding drum 23 from the outside, the gripping device 21 moves the cylindrical rubber member 17 away. Delivered to molding drum 23.

  This gripping device 21 has a ring body 24 that is fixed to the upper surface of the front end portion of the base 20 and whose central axis is coaxial with the forming drums 15 and 23. In addition, a ring body 25 having the same shape and the same shape as the ring body 24 is fixed to the upper surface of the rear end portion of the base 20, and a storage groove 26 having a rectangular cross section is formed on the outer periphery of the ring bodies 24 and 25, respectively. Has been.

  A plurality of pairs of guide rails 28 extending in the radial direction are laid on the inner side surfaces 27 of the ring bodies 24 and 25 facing each other, and the pair of guide rails 28 are arranged at equal angles in the circumferential direction. On the other hand, a plurality of pairs of guide rails 30 similar to the guide rails 28 are laid on the outer surfaces 29 of the ring bodies 24 and 25, and the circumferential positions of these guide rails 30 are the same as those of the guide rails 28. 31 is a plurality of sliders that are fitted to the ring bodies 24, 25 from the inside in the radial direction, here the number of the guide rails 28, 30 is the same as the logarithm of the cross section, and the inner surface of each slider 31 is mutually connected A plurality of slide bearings 32 and 33 are slidably engaged with the guide rails 28 and 30 forming a parallel pair, respectively.

  As a result, like the guide rails 28 and 30, the sliders 31 are arranged at a plurality of equidistant distances in the circumferential direction, six in this case, and can move in the radial direction while being guided by the guide rails 28 and 30. it can. A ring-shaped rotating ring 35 is rotatably stored in each of the storage grooves 26 of the ring bodies 24 and 25, and the rotating rings 35 have inclined slits 36 penetrating the same in the radial direction. Are formed at equal distances in the circumferential direction, here, the same number as the slider 31 is formed.

  The ring bodies 24 and 25 are formed with a plurality of pairs of radial slits 37 extending in the radial direction and intersecting the inclined slits 36, here the same number of pairs as the inclined slits 36. The guide rails 28 and 30 that make a pair are disposed at a distance from each other. Reference numeral 38 denotes a plurality of pins inserted at the intersecting positions of the inclined slit 36 and the radiating slit 37 at the center, here the same number of pins as the slider 31, and both ends of these pins 38 are fixed to the slider 31. .

  As a result, the slider 31 is always located on the same circle centered on the central axis of the ring bodies 24 and 25, and when the rotating ring 35 rotates, it is synchronized with the pin 38 while being regulated by the inclined slit 36 and the radiation slit 37. And move in the radial direction by the same distance. In this embodiment, the sliders 31 may be connected to each other by a link mechanism, and the sliders 31 may be synchronized by the link mechanism and moved by an equal distance in the radial direction.

  At the inner end in the axial direction of the slider 31 fitted to the ring bodies 24 and 25, an arcuate adsorbing body 40 made of, for example, a magnet is fixed to the inner end in the radial direction. A bead 42 with a filler 41 is carried in and held by suction. When the pair of beads 42 are attracted and held by the adsorbing body 40 in this way, the inner periphery of the bead 42 protrudes radially inward from the inner periphery of the slider 31 and the adsorbing body 40.

  In addition, an arc-shaped support flange 44 is integrally formed at the center in the radial direction on the outer surface in the axial direction of each slider 31 fitted to the ring body 24. Then, the radially outer ends of the five springs 45 are fixed. A plurality of (here, five) gripping segments 46 made of metal, plastic, or the like are fixed to the inner end of the spring 45 in the radial direction. As a result, the gripping segments 46 are gripped by the spring 45. The head can be swung with a swing point (fixed position of the spring 45 with respect to the support flange 44) radially outward from the segment 46 as a fixed point.

  Here, the grip segments 46 have an arc shape having a radius of curvature substantially the same as the distance from the grip segment 46 to the center axis of the ring body 24, and are arranged side by side in the circumferential direction. The plurality of gripping segments 46, here 6 × 5 = 30, constitute a gripping member 47 as a whole, and the gripping members 47 are arranged side by side in the circumferential direction. As a result, it has a ring shape as a whole. The gripping member 47 is supported by a frame 48 including the ring body 24, the slider 31, and the support flange 44 via a spring 45. Further, the inner periphery of the grip member 47 (the grip segment 46) protrudes slightly inward in the radial direction from the inner periphery of the bead 42 sucked and held by the suction body 40.

  As a result, the molding drum 15 having the cylindrical rubber member 17 formed on the outer periphery and the drive unit 13 are moved forward by the drive mechanism, and the cylindrical rubber member 17 is gripped by the gripping device 21 stopped at the receiving position U. After loosely fitting into the member 47, when the diameter of the forming drum 15 is increased by the expansion / contraction means (approaching means) and the cylindrical rubber member 17 approaches the gripping member 47, the outer periphery of the front end in the axial direction of the cylindrical rubber member 17 Is pressed and brought into close contact with the inner periphery of the gripping member 47, whereby the axial front end of the cylindrical rubber member 17 is gripped from the outside by the gripping member 47.

  In this embodiment, the expansion / contraction means of the forming drum 15 is used as the approach means.In this invention, the slider 31 and the gripping member 47 are moved radially inward as the approach means, for example, A cylinder or a link mechanism may be used to bring the gripping member 47 closer to the molding drum 15 holding a constant diameter. In short, the access means includes a cylindrical rubber member loosely fitted in the gripping member. What is necessary is just to be able to make this holding member relatively approach.

  Here, since the inner periphery of the gripping member 47 (the gripping segment 46) protrudes slightly inward in the radial direction from the inner periphery of the bead 42 sucked and held by the suction body 40 as described above, the gripping member 47 The cylindrical rubber member 17 in the portion in contact with the ring slightly deforms (thinner thickness is reduced), so that the outer periphery of the cylindrical rubber member 17 is aligned with the inner periphery of the beads 42 supported by the ring bodies 24 and 25. Also, the cylindrical rubber member 17 is gripped from the outside at two locations apart in the axial direction at the central portion in the axial direction by the bead 42 in addition to the axial front end portion described above. Thereafter, when the molding drum 15 is reduced in diameter, the cylindrical rubber member 17 is delivered from the molding drum 15 to the gripping device 21.

  And since the inner periphery of the grip member 47 (grip segment 46) described above is a mirror surface, the structure is simple, small, and inexpensive, but as described above, small irregularities (steps) are formed on the outer periphery of the cylindrical rubber member 17. ) Or a part of the gripping member 47 protrudes from the axial front end of the cylindrical rubber member 17, the adhesive force on the surface where the gripping member 47 and the cylindrical rubber member 17 are in close contact, Since the anchor function or the like acts, the cylindrical rubber member 17 can be reliably gripped from the outside by the gripping member 47.

  Here, the mirror surface refers to a surface close to a glossy mirror formed by mirror finishing such as optical polishing, buffing, barrel polishing, electrolytic composite grinding, and mirror cutting. Note that the protruding amount of the gripping member 47 (grip segment 46) from the inner periphery of the bead 42 to the inside in the radial direction prevents the excessive deformation of the cylindrical rubber member 17 and prevents the cylindrical rubber member 17 from being deformed. In order to securely grip the member 17 prior to the bead 42, a range of 0.05 to 0.25 mm is preferable.

  As described above, the gripping member 47 grips the axial end of the cylindrical rubber member 17, here the axial front end, which is the downstream side of the conveyance, in the cylindrical rubber member 17, If the axial end is more easily deformed than the central portion in the axial direction, and if the portion is deformed, it becomes an obstacle in a later process, for example, if the upper portion of the axial front end is suspended, the transfer device 18 causes the cylindrical rubber member to be deformed. When the 17 is transported to the delivery position M and is externally fitted to the molding drum 23, a situation occurs in which the hanging portion interferes with the molding drum 23. As described above, the axial front end of the cylindrical rubber member 17 is If the gripping member 47 is securely gripped, the above situation can be prevented.

  In this embodiment, only the front end in the axial direction of the cylindrical rubber member 17 is gripped by the gripping member 47, but only the rear end in the axial direction of the cylindrical rubber member 17 is held by the gripping member as necessary. May be held, or both end portions in the axial direction may be held. In short, at least one of the end portions in the axial direction of the cylindrical rubber member 17 may be held. Furthermore, the cylindrical rubber member 17 may be gripped by at least two positions separated in the axial direction by the gripping member. At this time, the gripping of the cylindrical rubber member 17 by the bead 42 may be omitted.

  Here, the inner circumference of the gripping member 47 (grip segment 46), which is a mirror surface, preferably has a surface roughness of 20 μm or less. The reason is that the cylindrical rubber member 17 can be strongly held by the holding member 47 when the surface roughness is equal to or less than the above value. In this embodiment, in order to improve the durability of the gripping member 47 (grip segment 46) easily and inexpensively, hard chrome plating is applied to the inner periphery of the gripping member 47 (grip segment 46).

  In FIG. 4, a plurality of connection holes 50 are formed on the inner periphery of each gripping segment 46 described above, and connection passages 51 formed in the gripping segment 46 communicate with these connection holes 50. 52 is a first passage that connects the connection passages 51 of the adjacent gripping segments 46, and the connection passage 51 formed in any one of the gripping segments 46 and the switching valve 53. The switching valve 53 includes a second passage. A vacuum source 55 is connected via 54.

  As a result, the connection hole 50 can be connected to the vacuum source 55 via the first and second passages 52 and 54. When the cylindrical rubber member 17 is pressed against the inner periphery of the gripping segment 46 and gripped by the gripping member 47, when the switching valve 53 is switched to connect the connection hole 50 and the vacuum source 55, the inside of the connection hole 50 The holding member 47 sucks and holds the cylindrical rubber member 17 due to the vacuum. As a result, the gripping of the cylindrical rubber member 17 by the gripping member 47 is supplementarily performed by suction using a vacuum in addition to adhesion and the like, and the gripping is further ensured.

  The switching valve 53 is connected to a compressed air source 58 via a third passage 57. As a result, the connection hole 50 is further connected to the compressed air source 58 via first and third passages 52 and 57. can do. When releasing the gripped cylindrical rubber member 17 from the gripping member 47 (the gripping segment 46), the switching valve 53 is switched to connect the connection hole 50 and the compressed air source 58, whereby the compressed air source The compressed air 58 is ejected from the connection hole 50 toward the cylindrical rubber member 17, so that the cylindrical rubber member 17 is easily and reliably released from the gripping member 47.

  Here, as described above, the switching valve 53 is interposed between the connection hole 50 and the vacuum source 55 and the compressed air source 58, and the connection hole 50 is connected to the vacuum source 55 or the compressed air source 58 by switching the switching valve 53. If connected to either one, the connection hole 50 can be used for both suction and grip release, so the structure becomes simple and can be manufactured at low cost.

  2 and 3, one bracket 61 is integrally formed on the outer periphery of each rotating ring 35, and a base end portion of a screw case 62 extending in a substantially tangential direction is connected to the bracket 61 so as to be swingable. . The screw case 62 is formed with a screw hole 63 extending from the distal end surface toward the proximal end, and the screw shaft 64 is screwed into the distal end side of the screw shaft 64. Reference numerals 65 denote brackets fixed to the outer peripheries of the ring bodies 24 and 25, respectively, and a motor 67 having an output shaft 66 connected to the base end of the screw shaft 64 is swingably supported by these brackets 65. .

  As a result, when the motor 67 is operated to rotate the output shaft 66 and the screw shaft 64 and the rotating ring 35 is rotated with respect to the ring bodies 24 and 25, the slider 31, the adsorbing body 40, and the gripping segment 46 are inclined slits. 36, synchronously move by a radial slit 37 and move by an equal distance in the radial direction. When the slider 31 or the like moves outward in the radial direction, the adsorbent 40 and the gripping member 47 can be detached from the cylindrical rubber member 17 and the bead 42 outward in the radial direction. The rotating ring 35, the screw case 62, the screw shaft 64, and the motor 67 described above constitute moving means 68 that moves the adsorbent 40 and the plurality of gripping segments 46 in the radial direction in synchronization.

  Here, as described above, the gripping member 47 is constituted by a plurality of gripping segments 46 having an arc shape arranged side by side in the circumferential direction, and these gripping segments 46 are moved in the radial direction in synchronization by the moving means 68. By doing so, the cylindrical rubber members 17 having different sizes (diameters) can be easily gripped. At this time, since the adsorbent 40 also moves in the radial direction together with the gripping segment 46, the beads 42 having different sizes corresponding to the cylindrical rubber member 17 can be easily gripped. In the case where the size of the cylindrical rubber member 17 to be gripped is constant, the gripping member may be composed of an integral ring body that is continuous in the circumferential direction.

  Further, as described above, each gripping segment 46 is supported on the frame 48 so as to be swingable with a swing point radially outside the gripping segment 46 as a fixed point, so that the size (diameter) is different or the shape is different. Even the cylindrical rubber member 17 that is slightly deformed from the cylindrical shape can be easily grasped. At this time, as described above, the radial inner end portion of the spring 45 is fixed to each gripping segment 46, and the radial outer end portion of the spring 45 is fixed to the frame 48 (support flange 44). If the segment 46 can be swung, each gripping segment 46 can be swung easily and inexpensively.

  In the present invention, only the compressed air source 58 may be provided, and an open / close valve may be provided between the compressed air source 58 and the connection hole 50 so that they can be connected. Further, the gripping segment 46 may be swingable by using a swingable air cylinder instead of the spring 45 as described above.

Next, the operation of the first embodiment will be described.
When the reduced-diameter molding drum 15 is driven and rotated by the drive unit 13, an inner liner is formed by winding a rubber sheet formed by joining unvulcanized rubber pieces together as described above. After that, when the ribbon-like pieces extending in the axial direction are stuck one after another on the forming drum 15 to form the carcass ply, the cylindrical rubber member 17 composed of the inner liner and the carcass ply is formed on the outer periphery of the forming drum 15. Is done. At this time, the transfer device 18 is stopped at the receiving position U, and the beads 42 with fillers 41 are adsorbed and held on the pair of adsorbers 40, respectively.

  When the cylindrical rubber member 17 is molded on the outer periphery of the molding drum 15 as described above, the driving unit 13 and the molding drum 15 move forward while being guided by the guide rail 11 by the driving mechanism, and the molding drum 15 and the cylindrical shape The rubber member 17 is loosely fitted into the ring bodies 24 and 25 and the holding member 47. In the present invention, the cylindrical rubber member 17 may be loosely fitted in the gripping member 47 by moving the transfer device 18 rearward. Thereafter, when the diameter of the forming drum 15 is increased by the expansion / contraction means (approaching means) and the cylindrical rubber member 17 approaches the gripping member 47, the outer periphery of the cylindrical rubber member 17 is pressed against the inner periphery of the gripping member 47 and closely contacts. Thus, the front end portion in the axial direction of the cylindrical rubber member 17 is gripped from the outside by the gripping member 47.

  At this time, since the inner periphery of the gripping member 47 (grip segment 46) is a mirror surface, there are small irregularities (steps, etc.) on the outer periphery of the cylindrical rubber member 17, while the structure is simple, small and inexpensive. Even if a part of the gripping member 47 protrudes from the front end in the axial direction of the cylindrical rubber member 17, an adhesive force or the like acts on the surface where the gripping member 47 and the cylindrical rubber member 17 are in close contact with each other. Therefore, the cylindrical rubber member 17 can be reliably gripped from the outside by the gripping member 47. At this time, if the switching valve 53 is switched to connect the connection hole 50 and the vacuum source 55, the inside of the connection hole 50 becomes a vacuum, and the gripping member 47 sucks and holds the cylindrical rubber member 17. The cylindrical rubber member 17 is gripped by the auxiliary by vacuum-based suction in addition to adhesion, and the gripping is further ensured.

  Here, since the inner periphery of the grip member 47 (the grip segment 46) protrudes slightly inward in the radial direction from the inner periphery of the bead 42, the cylindrical rubber member 17 in contact with the grip member 47 is slightly By deforming, the outer periphery of the cylindrical rubber member 17 is also pressed against and closely adhered to the inner periphery of the pair of beads 42, so that the cylindrical rubber member 17 is axially supported by the beads 42 in addition to the above-described axial front end. Also in the central portion in the direction, the gripping is performed from the outside at two locations separated in the axial direction. Thereafter, when the diameter of the molding drum 15 is reduced, the cylindrical rubber member 17 is transferred from the molding drum 15 to the transfer device 18.

  Next, the drive unit 13 and the forming drum 15 move rearward and return to the initial positions. At this time, the cylindrical rubber member 17 gripped from the outside by the gripping device 21 and the bead 42 is moved to the outside of the reduced-diameter molding drum 23 by the transfer device 18 being moved forward to the delivery position M by the drive mechanism. Mated. At this time, since the cylindrical rubber member 17 is securely gripped from the outside over the entire circumference by the gripping member 47 and the bead 42, the upper portion thereof does not hang down and does not interfere with the molding drum 23. Easy to fit. In the present invention, the transfer device may be stationary and the forming drum 23 may move backward to the receiving position U.

  Next, the diameter of the bead lock portion of the forming drum 23 provided at a position overlapping the bead 42 is expanded, and the bead 42 is interposed between the bead lock portion and the cylindrical rubber member as a result. 17 is gripped from the radially inner side. Next, when the output shaft 66 and the screw shaft 64 are rotated by the operation of the motor 67 and the rotating ring 35 rotates clockwise in FIG. 2, the slider 31, the adsorbing body 40, and the gripping segment 46 are synchronously moved radially outward. The adsorbent 40 and the gripping member 47 are separated from the cylindrical rubber member 17 and the bead 42 by moving the same distance.

  At this time, the switching valve 53 is switched, and the compressed air supplied from the compressed air source 58 to the connection hole 50 is ejected from the connection hole 50 to the cylindrical rubber member 17, whereby the gripping member of the cylindrical rubber member 17 is obtained. Release from 47 is done easily and reliably. Thereafter, the transfer device 18 moves rearward and returns to the receiving position U, and the operation of the motor 67 moves the slider 31 and the like radially inward to return to the initial position.

  At this time, in the forming drum 23, the bead lock portion and the bead 42 move so as to approach each other, and the forming drum 23 between these bead lock portions expands in diameter, so that the cylindrical rubber member 17 between the beads 42 is formed. 1, the cylindrical rubber member 17 on the outer side in the axial direction from the beads 42 is folded back around the beads 42 by a bladder or the like. Thereafter, a belt layer formed in a cylindrical shape in advance on the outside of the cylindrical rubber member 17 is supplied and affixed, and a ribbon made of unvulcanized rubber is spirally wound in a spiral manner and wound side by side. A top tread is formed to produce a green tire.

  Here, when the size (diameter) of the cylindrical rubber member 17 and the bead 42 is changed, the motor 67 is operated to rotate the rotating ring 35 so that the slider 31, the adsorbing body 40, and the gripping member 47 are cylindrical. The rubber member 17 is moved to a radial position corresponding to the size of the bead 42. At this time, since the gripping segment 46 is swingably supported by the frame 48 by the spring 45, even if the size (diameter) of the cylindrical rubber member 17 and the bead 42 is changed as described above, the gripping segment 46 By swinging, the cylindrical rubber member 17 can be gripped without any problem.

  The present invention can be applied to the industrial field in which a cylindrical rubber member is gripped from the outside.

It is a schematic front view which shows Embodiment 1 of this invention. It is the II arrow directional view with which a part of FIG. 1 was fractured | ruptured. It is II-II arrow sectional drawing of FIG. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2.

Explanation of symbols

17… Cylindrical rubber member 45… Spring
46… Grip segment 47… Grip member
48 ... Frame 50 ... Connection hole
53 ... Switching valve 55 ... Vacuum source
58… Compressed air source

Claims (11)

    The step of loosely fitting the cylindrical rubber member into the gripping member which is supported by the frame and has an annular shape as a whole and the inner periphery is a mirror surface, and the cylindrical rubber member and the gripping member are relatively brought close to each other by the approach means, A method for gripping a cylindrical rubber member, comprising: a step of gripping the cylindrical rubber member from the outside by the gripping member by bringing the outer periphery of the cylindrical rubber member into close contact with the inner periphery of the gripping member.     A frame, a gripping member that is supported by the frame, has an annular shape as a whole, and has a mirror inner surface, a cylindrical rubber member that is loosely fitted in the gripping member, and the gripping member relatively close to each other to form a cylinder The cylindrical rubber member is provided with an approach means for gripping the cylindrical rubber member from the outside by the gripping member by bringing the outer periphery of the cylindrical rubber member into close contact with the inner periphery of the gripping member. Gripping device.     The cylindrical rubber member gripping device according to claim 2, wherein at least one of axial ends of the cylindrical rubber member is gripped by the gripping member.     4. The cylindrical rubber member gripping device according to claim 2, wherein the mirror surface has a surface roughness of 20 [mu] m or less.     The cylindrical rubber member gripping device according to any one of claims 2 to 4, wherein the inner periphery of the gripping member is subjected to hard chrome plating.     The cylinder according to any one of claims 2 to 5, wherein the gripping member is composed of a plurality of gripping segments having an arc shape arranged side by side in the circumferential direction, and the gripping segments can be moved in the radial direction in synchronization. -Like rubber member gripping device.     7. A gripping device for a cylindrical rubber member according to claim 6, wherein each gripping segment is supported by a frame so as to be swingable with a swing point radially outward from the grip segment as a fixed point.     The cylindrical rubber according to claim 7, wherein the inner radial end of the spring is fixed to each gripping segment, the outer radial end of the spring is fixed to the frame, and each gripping segment can be swung by the spring. A gripping device for members.     A plurality of connection holes that can be connected to a vacuum source are formed on the inner periphery of the gripping member, and when the cylindrical rubber member is gripped by the gripping member, the connection holes that are evacuated by being connected to the vacuum source The cylindrical rubber member gripping device according to any one of claims 2 to 8, wherein the cylindrical rubber member is adsorbed.     A plurality of connection holes that can be connected to a compressed air source are formed on the inner periphery of the grip member, and when the cylindrical rubber member is released from gripping by the grip member, the compressed air of the compressed air source is cylindrical from the connection hole. The cylindrical rubber member gripping device according to any one of claims 2 to 8, wherein the gripping device ejects toward the rubber member.     A compressed air source that can be connected to the connecting hole is further provided, and a switching valve is interposed between the connecting hole, the vacuum source, and the compressed air source, and the connecting hole is switched between the vacuum source and the compressed air by switching the switching valve. The cylindrical rubber member gripping device according to claim 9, wherein the gripping device is connected to any one of the sources.

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