JP2008043965A - Apparatus for manufacturing bottle-shaped can - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make various forming work and stable forming work possible by making the stroke of a forming tool for forming a bottle-shaped can differnt from the stroke of a supporting plate. <P>SOLUTION: In a forming apparatus A for forming the opening part D of a can body B which is held with a can holder turret 20 by moving a supporting plate 32 back and forth whenever the can holder turret 20 is intermittently revolved, the forming tool 31 is held with a spindle part 40 so as to be stroked in the same direction as the spindle part and a stroke changing means 50 for making the stroke of at least one forming tool of a plurality of forming tools differ from the stroke of the supporting plate is provided in the spindle part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a bottle-shaped can manufacturing apparatus that manufactures a metal bottle-shaped can by forming an opening of the bottomed cylindrical can body in a state where the bottom portion is held by a can holder.

  Conventionally, as a bottle-shaped can manufacturing apparatus, a bottomed cylindrical can body is formed from a metal plate, and the can body is held by a can holder turret provided with a plurality of holders arranged in an annular shape. There is known an apparatus configured to rotate the can body by intermittently rotating. In this type of apparatus, a support plate that reciprocates toward the holder is provided on the side facing the can holder turret, and a plurality of molding tools for processing the can body are provided in the apparatus main body.

  The molding tool at a position corresponding to the can body reciprocates with respect to the opening of the can body, so that the upper opening portion of the can body is necked in, and a mouth portion having a smaller diameter than the body portion of the can body is formed. It is formed. In this case, since the neck portion is subjected to multiple neck-in processes to reduce the diameter, the tip of the mouth becomes uneven, so the tip is trimmed to align the height (length) of the mouth. Height is aligned.

  Next, after trimming, when the can body is further rotated and moved by the can holder turret, a thread for attaching the cap is formed on the mouth by a screw forming tool, and then the tip of the mouth is formed by the curl forming tool. The curled portion is formed by bending the curled portion outward, and then, if necessary, the curled portion is formed by a curled step that crushes the curled portion, and a bottle-type can is manufactured.

  Such a bottle-shaped can is then filled with contents such as drinking water, and a cap is put on the mouth, and a molding roll is pressed from the outer periphery of the covered cap to correspond to the screw thread of the mouth. A thread groove is formed on the peripheral surface of the cap to be capped and sealed.

  In this bottle-type can manufacturing apparatus, when the can body held by the holder on the can holder turret side intermittently rotates as described above, the can can be placed at a position corresponding to the can body while the rotation is stopped. A forming tool suitable for the process applied to the body moves forward. Then, the can body is sequentially processed in a predetermined process by a necking forming tool, a screw forming tool, a trimming forming tool, a curl forming tool, a bead forming tool, etc. to form a can body having a predetermined shape (Patent Documents 1 and 2). reference).

  According to this bottle-shaped can manufacturing apparatus, a molding tool having a form in which the stroke range used for molding is narrow out of the total stroke amount accompanying the forward movement of the support plate, in other words, molding starts at a position near the bottom dead center of the stroke. For example, in the case of a screw forming tool, the cam is operated near the bottom dead center of the stroke, and the mouth is formed by moving it toward or away from the center of the can with the forming tool rotated. Since molding is performed by the process, there is a problem that the molding time in which the molding tool can be moved toward and away from the center of the can is short, and therefore the processing accuracy of the dimensions of the can mouth (such as the thread dimensions) cannot be improved. is there. It has been proposed that such a molding tool is stroked from another drive source to ensure molding time (see Patent Document 3).

JP 2003-251424 A JP 2003-290855 A JP 2005-329423 A

  As described above, in a molding tool having a narrow stroke range used for molding, there is a problem that when the molding speed is increased, the molding time is further shortened, the molding dimensions of the can mouth portion are not constant, and capping defects are easily caused. Moreover, in the manufacturing apparatus proposed in the above-mentioned Patent Document 3, the drive system needs to be separately controlled, and the apparatus becomes complicated. In addition, the use of existing presses is difficult, and there is a problem that the equipment is expensive.

  The present invention has been made in view of the above technical problem, and without changing the stroke amount of the press body, without changing the stroke amount of the existing press body, and without requiring a separate drive source for the stroke. In addition, it is possible to change the stroke amount with a simple mechanism, and it is possible to use processes with different stroke amounts together in a single bottle-type can manufacturing device, even when manufacturing at a higher stroke speed. It is an object of the present invention to provide a highly versatile bottle-shaped can manufacturing apparatus that can secure sufficient time to stabilize the molding dimensions of a bottle-shaped can.

  In order to achieve the above object, the invention of claim 1 includes a can holder turret that rotates intermittently, and a support plate that is disposed opposite to the can holder turret to perform reciprocating motion, and a plurality of molding tools are attached to the periphery. Each time the can holder turret rotates intermittently, the support plate is reciprocated, and the opening of the can body is engaged with the opening of the can body held by the can holder turret. In the apparatus for manufacturing a bottle-shaped can, in which at least one of the plurality of molding tools is held on the support plate via the spindle portion so that the stroke can be performed in the same direction as the reciprocating direction of the support plate. The spindle section is provided with stroke variable means for making the stroke amount of the molding tool different from the stroke amount of the support plate. It is intended to.

  According to a second aspect of the present invention, there is provided a bottle-type can characterized in that the spindle portion according to the first aspect of the invention is configured to be reciprocally guided and rotatable with respect to the support plate. It is a manufacturing device.

  According to a third aspect of the present invention, the stroke variable means according to the first or second aspect of the invention is fixed to a movable rack that reciprocates integrally with the support plate and a common base that supports the support plate. A rack, and a two-stage pinion gear with a different number of teeth arranged between the movable rack and the fixed rack, and a small gear with a smaller number of teeth of the pinion gear engages with the movable rack. The large gear having a large number of teeth is engaged with the fixed rack, and is constituted by a direct-acting gear device that varies the stroke amount of the at least one molding tool to a stroke amount smaller than the stroke amount of the support plate. It is the manufacturing apparatus of the bottle-type can characterized by the above-mentioned.

  Further, the invention according to claim 4 is the spindle housing according to claim 3, wherein the spindle portion rotatably supports the two-stage pinion gear, and the spindle housing is orthogonal to the axis of the pinion gear. A sleeve mounted rotatably around a central axis of the can body, a support block provided on an outer periphery of the support plate, and a drive source pivotally supported by the support block and attached to the support plate A rotary carrier that rotates integrally with the sleeve, a cam spindle that rotates integrally with the rotary carrier and that can reciprocate within the rotary carrier, and a cam that is attached to the front end of the cam spindle and cams on the inner periphery A cylindrical cam having a surface, and penetrating the cam spindle and facing the cam spindle. The shaft is mounted with a resilient force applied to the front end side and rotates integrally with the rotary carrier, and is engaged with the cam surface of the cylindrical cam and is associated with the relative movement of the cylindrical cam. A molding tool head attached to the front end of the shaft so as to perform a molding operation, and a stopper provided at the rear end of the shaft so as to stop the movement of the shaft near the bottom dead center of the support plate; It is the manufacturing apparatus of the bottle-shaped can characterized by having.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the forming tool is at least one of a thread cutting forming tool, a force forming tool, and an annular bead forming tool. It is a manufacturing apparatus of the bottle-type can characterized by the above-mentioned.

  According to the first or second aspect of the present invention, when the support plate is moved forward toward the can holder turret, the spindle portion is stroked together with the support plate. In that case, the stroke amount of the at least one forming tool can be made to be either longer or shorter than the stroke amount of the support plate by the stroke varying means. Therefore, it is possible to set the stroke amount of multiple molding tools to an arbitrary stroke amount for each molding tool without changing the stroke amount of the support plate. As a result, the degree of freedom in the molding process is improved. And a versatile manufacturing apparatus. Further, in the invention of claim 1, it is possible to shorten the stroke amount of the forming tool without changing the stroke of the existing press, not only increasing the versatility of the press, but also by doing this, The impact when the molding tool comes into contact with the molding object can be mitigated, and the durability of the parts can be improved accordingly. Furthermore, by shortening the stroke amount of the molding tool, the molding time that can be used for the molding process can be lengthened, the dimension of the molded product can be stabilized, in other words, the processing accuracy can be improved. .

  According to the third aspect of the present invention, the stroke amount of the press can be easily shortened with a simple mechanism of changing the gear ratio of the stroke variable means constituted by the two-stage gear without providing a separate stroke drive source. Therefore, it is possible to eliminate restrictions on design of the can type that can be molded and the shoulder portion of the can body.

  Further, according to the present invention according to claim 4 or 5, in the molding tool that needs to be rotated, the molding amount can be sufficiently secured by varying the stroke amount by the stroke variable means. It is possible to stabilize the molding dimensions and to eliminate the cause of capping defects.

  The outline of the configuration of the bottle-shaped can manufacturing apparatus A according to the embodiment of the present invention will be described below with reference to FIGS. 1 and 2, the state shown in these figures is the actual installation state in the present embodiment, and the "front-rear" direction indicates the direction of the arrow X in FIG. And The main components of the manufacturing apparatus A are provided on a common base (machine base) 10, a can holder turret 20 that rotates intermittently, and similarly provided on the common base 10, and is disposed opposite to the can holder turret 20 to reciprocate. And a support plate 32 to which a molding tool 31 (referred to collectively as a plurality of types of molding tools) is attached, and at least one of the plurality of molding tools 31 is held, and the support plate 32 is reciprocated. The spindle unit 40 is configured to be able to stroke in the same direction as the reciprocating direction of the support plate in accordance with the movement, and the stroke varying means 50 that varies the stroke of the spindle unit 40. Then, every time the can holder turret 20 rotates intermittently by the bottle-shaped can manufacturing apparatus, the support plate 32 is reciprocated in the X direction to open the opening D of the can body B held by the can holder turret 20 (FIG. 1 (see FIG. 7).

  Here, before describing the bottle-shaped can manufacturing apparatus according to the present embodiment, an example of a procedure for forming the can body B manufactured by the manufacturing apparatus will be described with reference to FIG. That is, the bottle-shaped can (also referred to as a bottle can) is filled with a carbonated beverage, a fruit juice beverage, or the like, and the material thereof is a metal material made of, for example, aluminum, an aluminum alloy, or steel. After the bottomed cylindrical can body B as shown in FIG. 7 (a) was formed from the flat metal material, the opening side of the can body B was reduced in diameter than the can body as shown in FIG. 7 (b). The mouth E is neck-formed. Further, the mouth portion E is subjected to drawing processing a plurality of times to form a mouth portion F having a step shown in FIG. Next, as shown in FIG. 4D, after a threaded portion (thread) G is threaded in the mouth F, the opening side of the threaded portion G is neck-formed and the neck as shown in FIG. Part H is formed. Thereafter, as shown in FIG. 5 (f), a curled portion I is formed in which the opening edge of the neck portion H is folded outward (the curled portion I is pressurized from the side if necessary). Crushed). After the curled portion I is formed, a bead processing is performed on the lower neck portion of the screw portion G to form a bead portion J as shown in FIG. It has come to be. Below, each component of the manufacturing apparatus A of the bottle type can in this embodiment is demonstrated in detail one by one.

  As shown in FIG. 1, the can holder turret 20 has a disk-like turntable 22 that is rotatably supported on a main body 21 in a plane perpendicular to the plane of the common base 10. A circular spur gear 23 is integrally provided on the back side of the gear, and meshes with an output gear 25 of an index drive 24 that is an intermittent indexing device provided on the common base 10. The output gear 25 is intermittently rotated at a reduced speed by meshing with the spur gear 23 having more teeth than this, and the turntable 22 is intermittently rotated clockwise (in the direction of arrow Y). ing. Further, around the front side of the turntable 22, can holders 26 for chucking (gripping) the can body B in a horizontal state are arranged at equal intervals and in an annular shape.

  In addition, as shown in FIG. 2, the bottle-shaped can manufacturing apparatus A includes a part between the turntable 22 and the support plate 32 so as to form a part of the manufacturing line of the can body B. Further, a supply means 27 which is a conveyance device such as a chute or a belt conveyance device and a discharge means 28 are provided, and the can body B which has flowed from the upstream process is supplied to the can holder of the turntable 22 in the supply means 27. The can holder 26 that has received the can body B chucks the bottom of the can body B and holds it in a horizontal state. In this way, the bottle can be rotated and conveyed integrally with the turntable 22 while being held by the can holder 26 until the process of manufacturing the bottle can is completed. The completed can B (bottle can) is detached from the can holder 26 and delivered to the discharge means 28, and is supplied to a subsequent process (for example, an inspection process, a product shipping process, etc.) by a conveying device. It is like that.

  On the other hand, a crank motion drive source 29 is provided on the main body 21 side of the can holder turret 20. The crank motion drive source 29 has, for example, a crankshaft that is rotationally driven by a motor and a connecting rod (connecting rod), not shown, and is coupled to transmit the output of the connecting rod to the slide shaft 29A. Yes. The slide shaft 29A passes through a hole 22A formed in the center of the turntable 22 instead of a bearing and extends to the right. The slide shaft 29A is directly connected to the central portion of the disc-shaped support plate 32 at the right end thereof. It is supported like a cantilever. When the crank motion drive source 29 is driven, the slide shaft 29A reciprocates linearly in the arrow X direction (front-rear direction). As a result, the support plate 32, that is, the forming tool 31 such as the spindle portion 40 can reciprocate while moving close to or away from the can body B of the can holder turret 20.

  The support plate 32 is provided on the common base 10 so as to face the can holder turret 20. That is, it is integrally coupled to the right end of the slide shaft 29A coupled to the crank motion drive source 29 in a cantilever shape. The support plate 32 has a disk-like shape that is substantially the same size as the turntable 22, and the can holder on the turntable 22 is located near the outer peripheral edge of the surface of the support plate 32 facing the turntable 22. A predetermined molding tool 31 is installed so as to face each can B gripped by 26. The support plate 32 is configured to have rigidity capable of supporting a load of a molding tool 31 to be mounted, a spin motor 60 described later, and the like.

  By the way, although the type of the molding tool 31 varies depending on the type of the bottle-shaped can to be molded, the bottle-shaped can of this embodiment can be molded by, for example, a neck molding tool (having 10 or more processes in order). ), A plurality of forming tools 31 such as a trim forming tool, a thread cutting forming tool, a curl forming tool, and an annular bead forming tool are arranged around the support plate 32. That is, the forming tool 31 corresponding to the order of the forming process is sequentially arranged in the peripheral portion of the support plate 32 from the upstream side to the downstream side in the rotation direction Y of the turntable 22. Of these, in the case of neck molding as shown in FIGS. 7B and 7C, that is, die neck molding is performed with a long and long stroke with respect to the can B (b) and (c). In the case of such neck forming (for example, a taper type bottle can with a long shoulder inclination, a crane neck type bottle can with a long neck, etc.), it is like a forming tool that rotates the forming tool 31 to perform spin forming. A relatively long stroke amount is required as compared with a neck forming die forming tool such as (e) which is not a long rotating tool or a long forming length. In the present embodiment, these molding steps can be mixed and molded in a single manufacturing apparatus. Further, both the non-rotating form and the rotating form forming tool 31 can be incorporated into the support plate 32 so that they can reciprocate with different stroke amounts.

  As shown in FIG. 1, these rotating forming tools 31 are provided with a spindle portion 40 to be described later on the back surface (right side surface in FIG. 1) of the support plate 32, and a rotational driving force is applied to the spindle portion 40. A spin motor 60 to be applied is provided via a bracket 62. The driving force of the spin motor 60 is transmitted to the spindle unit 40 via a timing belt 61 that is a winding transmission.

  That is, a separate stand 51 is fixed to the common base 10 as a machine base of the bottle-shaped can manufacturing apparatus A, and a fixed rack 52 of a stroke varying means 50 described later is attached to the separate stand 51. The fixed rack 52 meshes with a large gear 53 that constitutes one component of the stroke varying means 50, and the large gear 53 rotates while meshing with the fixed rack 52 in accordance with the reciprocation of the support plate 32. By moving, the spindle portion 40 is guided so as to reciprocate with respect to the support plate 32, and is configured to be received and supported rotatably. Thus, when the support plate 32 reciprocates in the X direction via the slide shaft 29A, the spindle portion 40 synchronizes with the support plate 32, and the stroke is varied to reciprocate. Therefore, for example, when threading is performed with the thread cutting tool 31, the support plate 32 is reciprocated in the X direction with respect to the can holder turret 20 each time the can holder turret 20 is intermittently rotated, and the can holder turret The mouth part F of the can body B held at 20 is molded by the molding tool 31 provided on the spindle part 40 described later.

  An example of the above screw forming process will be further described. That is, the configuration of the spindle unit 40, which is one of the main components of this embodiment, is mounted on the back surface of the support plate 32 as shown in FIGS. 3 (a), 3 (b), and 3 (c). A rotary carrier 41 that is rotationally driven by a spin motor 60 that is a driven source, a sleeve 42 that is provided on the outer periphery of the rotary carrier 41 so as to be able to reciprocate and that can be rotated together with the rotary carrier 41, and A spindle housing 43 provided on the outer periphery of the sleeve 42 and pivotally supported so as to reciprocate (slide) along the outer periphery of the rotary carrier 41 integrally with the sleeve 42, and provided in the rotary carrier 41. Cam spindle that can rotate integrally, slides back and forth integrally with the sleeve 42, and has a cylindrical cam 47 at the front end 45 and a center shaft 48 provided in the cam spindle 45 so as to be capable of reciprocating movement, formed so as to be integrally rotatable with the rotary carrier 41, and having a forming tool head 49 (corresponding to the forming tool 31) at the front end. It is configured. Hereinafter, each of the above-described elements constituting the spindle unit 40 will be specifically described sequentially.

  A cylindrical support block 46 is fitted into a hole 32a formed in the vicinity of the outer periphery of the support plate 32, and a flange of the support block 46 is fastened to the support plate 32 with a bolt. In the support block 46, a cylindrical rotation support cylinder 46a is provided concentrically with the support block 46 via a bearing. Thus, the rotation support cylinder 46a is rotatable within the support block 46 in a state where movement in the front-rear direction is restricted.

  A cylindrical driving force transmission cylinder 41a is fitted to the right outside of the rotation support cylinder 46a via a key 41b, and a lock nut 41c is attached to the end of the rotation support cylinder 46a. The driving force transmission cylinder 41a is screwed and fixed to the rotation support cylinder 46a. The driving force transmission cylinder 41 a is formed with teeth 61 a that engage the timing belt 61 that is spanned between the driving force transmission cylinder 41 a and the driving force of the spin motor 60 via the timing belt 61. The driving force transmission cylinder 41a is rotated. Thus, when the spin motor 60 is driven, the driving force is transmitted to the driving force transmission cylinder 41a, and can rotate integrally with the rotation support cylinder 46a.

  Further, a cylindrical rotary carrier 41 is bolted to the right side of the driving force transmission cylinder 41a with a bolt. On the inner peripheral surface of the rotary carrier 41, a spline groove 41e and a long hole 41f that allow a key block 45d fitted in a sleeve 42 described later to stroke in the front-rear direction are formed along the front-rear direction. Yes. Thus, the torque of the spin motor 60 is transmitted to the rotary carrier 41 via the driving force transmission cylinder 41a. That is, the rotary carrier means, the driving force transmission cylinder 41a, and the rotation support cylinder 46a constitute a rotary carrier means.

  A cylindrical sleeve 42 is slidably provided on the outer periphery of the rotary carrier 41, and a spindle housing 43 is provided on the outer periphery of the sleeve 42 via a bearing (ball bearing) 42a. Yes. Thus, the sleeve 42 and the rotary carrier 41 can be rotated while being integrally supported by the spindle housing 43.

  By the way, inside the rotary carrier means constituted by the rotary carrier 41, the driving force transmission cylinder 41a, and the rotation support cylinder 46a, the rotation axis L of the rotary carrier means, that is, the center shaft 48 A cylindrical cam spindle 45 is provided coaxially with the rotation axis L. The front of the cam spindle 45 is slidably supported by the rotary support cylinder 46a via the bush 45a. On the other hand, a square spline (hereinafter referred to as “first spline”) 45c is provided on the outer periphery behind the cam spindle 45 via a key 45b. The first spline 45c can transmit the torque of the spin motor 60 transmitted to the rotary carrier 41 to the cam spindle 45 by spline engagement with a spline groove 41e formed on the inner peripheral surface of the rotary carrier 41. ing. A plurality of key blocks 45d are fitted to the first spline 45c in a direction perpendicular to the rotation axis L, and connect the sleeve 42 and the first spline 45c. Thus, when the sleeve 42 slides back and forth on the outer peripheral surface of the rotary carrier 41 in conjunction with the spindle housing 43 (reciprocating), the cam spindle 45 is integrated with the sleeve 42 while the key block 45d moves in the long hole 41f. Thus, it is possible to make a stroke in the rotary carrier 41 along the spline groove 41e, that is, along the center line (rotation axis) L.

  The center shaft 48 is formed of a shaft 48a and a pipe portion 48b that is integrally fitted to the outside thereof. In the vicinity of the right end of the pipe portion 48b of the center shaft 48, a ring-shaped square spline (hereinafter referred to as "second spline") 48d is positioned and fixed by tightening a lock nut 48e via a key 48c. The spline is fitted into a spline groove 41e formed on the inner periphery of the rotary carrier 41. A molding tool head 49 is attached to the front end of the pipe portion 48b so that the cam contact with the cylindrical cam 47 is possible. Further, a spring S is provided in a compressed state between the pipe portion 48 b and the cam spindle 45. The rotation of the spin motor 60 is transmitted to the center shaft 48 via the rotary carrier 41 and the second spline 48d.

  Thus, the rotation of the spin motor 60 transmitted to the rotary carrier 41 is transmitted to the cam spindle 45 via the first spline 45c and to the center shaft 48 via the second spline 48d. That is, the cam spindle 45 and the center shaft 48 rotate integrally with the rotary carrier 41 in synchronization. On the other hand, when the first spline 45c slides back and forth due to the presence of the spring S, the molding attached to the tip of the center shaft 48 during the initial stroke of moving forward from the initial position shown in FIG. The tool head 49 can move together with the cylindrical cam 47 via the spring S.

  A stopper 48f is provided on the right end (rear end) of the center shaft 48 through a bearing 48e so as to come into contact with a stopper collision portion 51a fixed to the separate mount 51. By providing this bearing 48e, rubbing with the stopper collision portion 51a is prevented. The distance V between the stopper collision portion 51a and the stopper 48f in the initial state of FIG. 3 (a) is such that the stopper 48f stops before the bottom dead center when the support plate 32 strokes forward (leftward in FIG. 1). Abutting on the collision portion 51a, the center shaft 48 is forcibly stopped from moving forward while being rotatable. Thereafter, as shown in FIG. 3B, only the cam spindle 45 is set to move forward with respect to the center shaft 48 while rotating.

  FIG. 5 shows the configuration of the cylindrical cam 47 and the forming tool head 49, and is an enlarged cross-sectional view of the main part corresponding to the state shown in FIG. 3 (b). On the inner peripheral surface of the cylindrical cam 47, a cam surface 47 a is formed which forms a gentle inclined surface from a position slightly recessed backward from the front opening end to increase the wall thickness. On the other hand, on the forming tool head 49, a threaded inner roller 49a inserted into the mouth of the can body B and a threaded outer roller 49b arranged outside the mouth are supported by bearings 49c and 49d. . The bearing 49c has a first cam roller 49e as a threading roller, and the bearing 49d has a second cam roller 49f having the same size as the first cam roller 49e, symmetrical with respect to the rotation axis L (center line of the can body B). Is attached.

  As each cam roller 49e, 49f rolls on the cam surface 47a and rides on, the threaded inner roller 49a that has been located on the center line L of the can body B until then is offset biased radially outward, and The threaded outer roller 49b is offset in the direction of the center line L so that the threaded outer roller 49b and the threaded inner roller 49a approach each other on both sides of the mouth F and can be threaded (threaded). To do. Thus, the cylindrical cam 47 advances from the cam open position (position corresponding to FIG. 3A) indicated by a two-dot chain line in FIG. 5, and the outer side of the molding tool head 49 is relatively moved along with the stop of the stopper 48f. Move to.

  When the cam rollers 49e and 49f run on the cam surface 47a near the bottom dead center of the stroke, the threaded outer roller 49b and the threaded inner roller 49a approach each other to form the thread G in the mouth F. . That is, the cam rollers 49e and 49f do not operate until near the bottom dead center, and the height of the threaded inner roller 49a is reached before the bottom dead center when the forming tool head 49 moves forward toward the mouth of the can body B. After the position in the direction (rotation axis L direction) is determined by colliding with the stopper collision portion 51a, the cam rollers 49e and 49f are operated by the cylindrical cam 47 that moves forward with the forward movement of the support plate 32.

  As described above, when the cylindrical cam 47 reaches the point R before the bottom dead center, the threaded outer roller 49b is moved toward the center line L by the cam roller and is set so as not to operate until then. Needless to say, the mechanism according to the present embodiment is also used for the forming tool 31 in a rotating form other than the screw forming process, such as a curl forming process and a bead forming process.

  1 to 4, the stroke varying means 50 includes an arm bracket 50 a fixed to the support plate 32, and a movable rack 55 that is fixed to the lower rear side of the arm bracket 50 a and reciprocates integrally with the support plate 32. And a fixed rack 52 attached to a separate stand 51 fixed on the common base 10, and two-stage pinion gears 53 and 54 arranged between the movable rack 55 and the fixed rack 52 and having different numbers of teeth. Has been. Thus, among the pinion gears, the small gear 54 having a small number of teeth engages with the movable rack 55, and the large gear 53 having a large number of teeth engages with the fixed rack 52. A direct-acting gear device that is variable to a stroke amount smaller than the stroke amount is configured, and the spindle portion 40 is attached to the stroke variable means 50 so as to be slidable and rotatable back and forth.

  The pinion gear (two-stage gear) is pivotally supported on the spindle housing 43 via a bearing 56 so as to be rotatable. The sleeve 42 is mounted in the spindle housing 43 so as to be rotatable on the axis of the can body B (on the central axis L of the forming tool) so as to be orthogonal to the axis of the pinion gears 53 and 54. The two-stage gears 53 and 54 are detachable from the spindle housing 43 and are attached so that the stroke variable amount can be easily changed.

  The stroke varying means 50 is provided so that at least one of the forming tools in the threading step, the curl forming step, and the bead forming step has a short stroke. Thus, when the support plate 32 moves forward, the movable rack 55 fixed to the arm bracket 50a moves forward, so that the two-stage gears 53 and 54 rotate. Thereby, the cylindrical cam 47 and the forming tool head 49 are stroked forward. In the present embodiment, the gear ratio of the two-stage gear, that is, the stroke ratio (stroke amount of the support plate 32: stroke amount of the cam spindle 45) is set to be 4: 3. That is, the stroke amount of the cylindrical cam 47 is set to (3/4) N with respect to the stroke amount N of the support plate 32. For this reason, when the support plate 32 strokes forward (V) and the stopper 48e provided at the rear end of the center shaft 48 collides (contacts) with the stopper collision portion 51a, the stroke of the molding tool head 49 stops. At this time, the molding time can be increased by 10% or more, and the speed at the time of collision of the stopper can be reduced by 10% or more by the stroke variable means 50 compared with the case where the stroke variable means 50 is not provided. It was.

  The operation of this embodiment will be described. Among the two-stage pinion gears 53 and 54, stroke variable means 50 is provided in which the small gear 54 is engaged with the movable rack 55 and the large gear 53 is engaged with the fixed rack 52, and the rotation shaft 57 of the pinion gear is connected to the spindle housing 43. Are coupled to each other through a bearing 56. For this reason, when the index drive 24 stops intermittent driving and the feeding of the can body B is stopped, the can body B set on the can holder turret 20 is threaded. That is, when the slide shaft 29A slides forward from the state of FIG. 3A by driving the crank motion drive source 29, the support plate 32 moves forward. In parallel with this, the spindle portion 40 approaches the can holder turret 20 side in conjunction with the front stroke of the support plate 32. Since the driving force of the spin motor 60 is transmitted to the driving force transmission cylinder 61a via the timing belt 61, the rotary carrier 41 and the sleeve 42 spin (rotate), and the cam spindle 45 and the center shaft 48 move forward. Move. At this time, the moving rack 55 fixed to the support plate 32 side meshes with the small gear 54, and the fixed rack 52 meshes with the large gear 53, while the spindle unit 40 strokes forward. In the process in which the support plate 32 strokes the forward stroke, the stopper 48f of the center shaft 48 is moved while the cylindrical cam 47 at the front end of the cam spindle 45 and the molding tool head 49 are moving forward while rotating synchronously. When colliding with the stopper collision part 51a, the molding tool head 49 stops at a position (point R) before reaching the bottom dead center as shown in FIG. 3B or FIG. Is placed in the molding tool head 49 and becomes a standby position for thread cutting.

  Further, the support plate 32 strokes forward, and the cylindrical cam 47 advances while compressing and deforming the spring S. Then, when the cylindrical cam 47 and the forming tool head 49 move relatively, as shown in FIG. 5, the cam roller 49e and the like that are in the state of the two-dot chain line ride on the cam surface 47a and change to the state shown by the solid line. Be biased. As a result, the threaded inner roller 49a is biased radially outward, the threaded outer roller 49b is biased radially inward, and rotates while sandwiching the mouth D with the threaded inner roller 49a on the other side. Then, threading is performed on the mouth portion D. Then, the cylindrical cam 47 strokes to reach the bottom dead center, and after the bottom dead center is reached, the recovery process is started, the support plate 32 strokes backward, and the spindle unit 40 and the stroke variable means 50 are The operation is reversed to that described in the above, and the state returns to the state of FIG.

  The above process is shown in a timing chart in FIG. 6. The index drive 24 stops feeding the can body B at timing T1, molding starts at timing T2, and molding ends at T3. Thereafter, the index drive starts operating again at timing T4, and the can holder turret 20 is intermittently driven. Therefore, according to this embodiment, there are the following advantages. That is, in the conventional apparatus, as shown by the curve Q in FIG. 6, the timing of the intermittent transfer of the can body is kept as it is, and the support plate 32 is stroked by the stroke amount N without the stroke varying means 50 described above. If it does, when carrying out threading shaping | molding with a rotary tool, shaping | molding will be performed in the vicinity of a bottom dead center. In the case of die neck molding or the like, the molding time from point R to bottom dead center is (t3-t2).

  On the other hand, according to the present embodiment, since the stroke varying means 50 is provided, the stroke amount of at least one molding tool among the plurality of molding tools is changed without changing the stroke amount N of the press itself. Can be easily changed to a small stroke amount. As a result, it is possible to make the cylindrical cam 47 and the molding tool head 49 have a short stroke ((3/4) N in this example), and the molding time is (T3-T2), which is 10% compared with the conventional apparatus. Since it can be increased as described above, there is an advantage that the processing accuracy can be improved, the molding dimension of the product can be stabilized, and capping can be performed smoothly.

  Conventionally, depending on the stroke amount, it is necessary to separate the bottle-shaped can molding process from the neck molding process and the rotary tool molding process using separate presses with different stroke amounts. However, in this embodiment, the molding tool that performs molding with the normal stroke amount of the press and the molding tool that performs molding with a different stroke amount are included in the same manufacturing apparatus A. There is an advantage that the range of combinations of processes can be expanded.

  Further, the molding time can be increased, and as a result, there is an advantage that a product with good processing accuracy can be manufactured even if the speed is increased.

  In addition, for example, taper type bottle cans and crane neck type bottle cans with long necks are manufactured in the same manufacturing equipment. It becomes possible to do.

  In addition, the can holder is intermittently rotated in a certain direction, and each forming tool is reciprocated in conjunction with the can holder to deform the opening of the can body held by the can holder. Tool collision speed increases. Therefore, the impact at the time of collision is likely to increase, and the machining accuracy is also likely to decrease.However, according to this embodiment, the maximum operating speed of the conventional one can be greatly reduced by shortening the stroke in this embodiment. In addition, the instability of the molding dimension can be eliminated, and the problem of easily leading to early breakage of parts can be eliminated at the same time.

  Although the present invention has been described in detail with reference to one embodiment, the specific configuration is not limited to this embodiment, and the scope of the present invention can be changed even if there is a design change or the like without departing from the gist of the present invention. include. For example, it is possible to change only the stroke amount without rotating the spindle portion, and it is also possible to replace the gear ratio of the stroke varying means 50 by reversing and to make the stroke longer than usual. Therefore, even if the stroke of the existing press is used as it is, it can be applied to, for example, neck formation of a long can having a high can height.

  In the present embodiment, the two-stage gear is used as the stroke varying means, but is not limited to this. For example, the stroke of the cylindrical cam 47 and the molding tool head 49 can be controlled using a ball screw mechanism instead of the two-stage gear.

It is a layout view showing a bottle-shaped can manufacturing apparatus of the present invention. It is a front view of the manufacturing apparatus of the bottle-shaped can of this invention. It is a schematic mechanism explanatory drawing of the stroke variable apparatus in the state in which the support plate of this invention is located in a top dead center. It is a schematic mechanism explanatory drawing of the stroke variable apparatus in the state in which the support plate of this invention is located in a bottom dead center. It is a partial expanded sectional view which shows the mechanism around the spindle part in this invention. It is a perspective view of the stroke variable device of the present invention. It is a state figure at the time of the cam open of the thread cutting tool of a bottle type can, and a cam shaft. It is a timing chart comparison figure by stroke variable of the present invention. It is the shaping | molding schematic by the manufacturing apparatus of the bottle-shaped can of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Common base (machine base), 20 ... Can holder turret, 22 ... Turntable, 24 ... Index drive, 26 ... Can holder, 29 ... Crank motion drive, 29A ... Slide shaft, 31 ... Molding tool, 32 ... Support plate 40 ... spindle part, 41 ... rotary carrier, 42 ... sleeve, 43 ... spindle housing, 45 ... cam spindle, 48 ... center shaft, 48f ... stopper, 50 ... stroke variable means, 51a ... stopper collision part, 52 ... fixed rack 53 ... Large gear, 54 ... Small gear, 55 ... Moving rack, 60 ... Spin motor, 61 ... Timing belt, A ... Bolt-shaped can manufacturing device, B ... Can body, G ... Threaded portion, thread, L ... Center line (rotation axis), S ... Spring.

Claims (5)

A can holder turret that rotates intermittently, and a reciprocating motion arranged opposite to the can holder turret, and a molding tool is provided with a plurality of support plates attached to the periphery, each time the can holder turret rotates intermittently, In a bottle-type can manufacturing apparatus that reciprocates a support plate and sequentially forms the opening of the can body by engaging the forming tool with the opening of the can body held by the can holder turret,
At least one molding tool among the plurality of molding tools is held on the support plate via the spindle portion so as to be able to stroke in the same direction as the reciprocating direction of the support plate, and the stroke amount of the molding tool is held on the spindle portion. An apparatus for producing a bottle-shaped can, characterized in that stroke variable means for varying the stroke amount of the support plate is provided.   2. The bottle-type can manufacturing apparatus according to claim 1, wherein the spindle portion is guided so as to be reciprocally movable with respect to the support plate and is configured to be rotatable.   The stroke varying means includes a movable rack that reciprocates integrally with the support plate, a fixed rack that is attached to a common base that supports the support plate, and a tooth that is disposed between the movable rack and the fixed rack. Two-stage pinion gears having different numbers, and among the pinion gears, a small gear with a small number of teeth is engaged with the movable rack, and a large gear with a large number of teeth is engaged with the fixed rack, 3. The bottle-shaped can according to claim 1, wherein the bottle-shaped can has a linear motion gear device that can change a stroke amount of the at least one forming tool to a stroke amount smaller than a stroke amount of the support plate. Manufacturing equipment.   The spindle portion is rotatably mounted about a central axis of the can body perpendicular to the axis of the pinion gear in the spindle housing, and a spindle housing that rotatably supports the two-stage pinion gear. A sleeve, a support block provided on an outer periphery of the support plate, a rotary carrier pivotally supported by the support block and rotated integrally with the sleeve by a drive source attached to the support plate, and the rotary carrier A cam spindle that rotates integrally with the rotary carrier and that can reciprocate in the rotary carrier, a cylindrical cam that is attached to the front end of the cam spindle and has a cam surface on the inner periphery, and penetrates the cam spindle And mounted with a resilient force applied to the front end side of the cam spindle, A shaft that rotates integrally with the rotary carrier, and is attached to the front end of the shaft so as to engage with the cam surface of the cylindrical cam and to perform a molding operation in association with the relative movement of the cylindrical cam. 4. The bottle mold according to claim 3, further comprising: a molding tool head; and a stopper provided at a rear end of the shaft so as to stop the movement of the shaft near the bottom dead center of the support plate. Can manufacturing equipment.   5. The bottle mold according to claim 1, wherein the forming tool is at least one of a thread cutting tool, a force-forming tool, and an annular bead forming tool. Can manufacturing equipment.

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