JP4606266B2 - Capping device - Google Patents

Description

The present invention forms a screw groove along a screw thread on a peripheral surface of a cylindrical portion of a metal cap rough shape member (hereinafter sometimes simply referred to as a cap) to be put on a container mouth portion, and a metal cap. the skirt portion of the coarse profiles relate Kyapin GuSo location to hem clamping molding hem tightening roller.

  As a metal cap for a container, a cylindrical cap with a bottom provided with a top plate portion and a skirt portion depending from the outer periphery thereof is widely known. A roll-on-capping method is known as a method for attaching this type of cap to the container mouth. In this method, the container mouth is covered with a cap rough shape, and pressure is applied to the top surface of the cap rough shape to bring it into close contact with the open end of the container mouth. The thread forming roller is pressed against the peripheral surface of the skirt part of the skirt part to form a thread part that matches the thread of the container mouth part, and the skirt tightening roller is pushed into the skirt skirt part of the cap to lock the cap to the container mouth part. . An example of a forming head in a capping device for performing such capping is described in Patent Document 1.

  The roll-on-capping method for forming a threaded portion on the cap rough shape material after the cap rough shape material is covered on the container mouth portion in this way is provided with a screw portion in the cap in advance and screwed into the container mouth portion. Compared to the capping method, it is an excellent method in that it can always form a screw shape suitable for the container mouth, and has high working efficiency.

  By the way, the method of forming the screw part after covering the container mouth part with the metal cap in this way is to form the screw part suitable for the thread of the container mouth part with the screw forming roller. In general, a hem fastening roller is pushed into the lower end of the container and squeezed inward to be engaged with the convex bead of the container mouth. This is for providing a pilfer proof function so that the fact of opening can be understood once the container is opened.

Conventionally, as the structure of the hem tightening roller that performs the hem tightening molding, the outer peripheral portion of the hem tightening roller continues to the lower side of the convex beat of the container mouth, and corresponds to the locking groove that is dented inward in the radial direction. When forming a hem fastening portion by forming a concave curved surface on the outer periphery of the hem fastening roller, or a structure that increases the locking ability of the cap by forming it on a flat outer peripheral surface of a predetermined width (see, for example, Patent Document 2), A structure for preventing buckling of the container mouth, poor sealing, poor opening, etc. (see, for example, Patent Document 3) is known. In addition, in these Patent Documents 2 and 3, when performing hem fastening of a rough cap material, the hem fastening roller is pushed into the lower side of the convex bead formed in advance in the container mouth, and the cap is placed in the container mouth. Locking to the convex bead of the part.
JP-A-1-99967 Japanese Utility Model Publication No. 63-062400 JP 2001-270596 A

  However, in the conventional forming head, the screw forming roller and the skirt fastening roller are rotated around the cap by being pressed around the cap, and therefore slip easily occurs between the cap and the cap when the roller is pressed. In addition, when performing cap screw molding or hem fastening with a three-piece can container (for example, a reseal container that is roll-on-capped to one open end of a welded can body), there is a weld on the side of the container mouth. Due to the effect of the step of the welded part, the screw forming roller and the cuffing roller are likely to be damaged and the roll surface is roughened in a short time, and the durability is deteriorated or the rough surface is capped. There is a problem that the quality is deteriorated by being transferred to the container side.

  Further, as described in Patent Documents 2 and 3 above, if the skirt fastening roller is pushed down to the bottom of the convex bead, the skirt of the cap can be securely locked to the convex bead. Since the annular bead is formed inwardly in the radial direction following the convex bead at the container mouth, when the hem roller is pushed in as described above, the hem roller and the annular bead Contact with the outer peripheral surface of the container (the outer peripheral surface of the container mouth portion), and if slip occurs between them, the surface of the hem fastening roller is roughened, or the appearance of the hem fastening portion is scratched and the quality is deteriorated. The problem arises.

  Furthermore, according to Patent Document 1, the pressure block presses the top plate portion of the cap with a predetermined striking pressure until the cap is completely tightened. After the thread forming roller contacts the peripheral surface of the cap, it rotates around the cap until it engages with the thread and the thread starts to be molded, and follows the shape of the thread at the thread forming start position of the container mouth. The screw groove is formed by moving downward while rotating.

  However, when the cap is tightened at a high speed, it is easy to cause slipping or jumping at the beginning of contact because the rotatable screw forming roller starts rolling contact on the outer peripheral surface of the cap at the moment of contact with the outer peripheral surface of the cap. For this reason, the timing of moving downward along the screw thread is likely to be shifted, screw forming is not normally performed, and a screw forming defect (so-called headband phenomenon) is likely to occur. In order to suppress such screw forming failure (winding failure), the pressing force from the side surface of the screw forming roller has to be increased, which has been a cause of deformation of the container mouth and the cap.

The present invention has been made in view of the above-mentioned problems of the prior art, and its purpose is to prevent wear and roughening of the molding surface of the screw forming roller and the hem fastening roller to improve durability, and to form the screw. Prevents slipping at the start and start of hem fastening, prevents damage to the cap and dents, prevents poor thread formation, improves quality, and securely engages the cap with the container mouth It is to provide an advantageous capping GuSo location speeding to locked.

To accomplish the above object, a pressure unit for pressing the metal cap coarse profile which is put on the container mouth portion to the container opening, around the periphery of the pressurizing unit, in the capping device comprising a spindle unit having a screw shaped rows La close and away with respect to the cap coarse profile, the rotational force when close to the cap coarse profile, in advance in a forward direction to the screw forming roller screw forming roller rotating means Re et al provided the screw forming roller rotating means for imparting, the provided on the outer periphery of the pressurization unit, a contact member for transmitting rotational torque to the roller axis, wherein the screw forming roller is mounted, A pressure roller provided on the roller shaft and rotating in contact with the contact member, wherein the contact member is fluid pressure when approaching / separating from the rough cap member. Therefore, it is a capping device according to claim which is constituted by possible expansion and contraction mechanism.

The invention of claim 2, Oite to claim 1, and hem tightening roller toward and apart from to the metal cap roughness profile molding hem tightening the skirt portion of the metal cap coarse profile Hem fastening roller rotating means for applying a rotational force in the forward direction to the skirt fastening roller in advance when approaching the rough shape member of the cap is further provided. to further the roller shaft in which the skirt fastening forming roller is mounted is provided on the outer periphery, characterized in it to contain the other pressure roller which rotates in contact with the other provided on the roller shaft and the contact member It is a capping device.

  According to the present invention, each roller is rotated in advance and molding is performed. Therefore, slipping and jumping of each roller, which are likely to occur during cap tightening molding, can be prevented, and the durability of each roller can be improved and the cap can be formed. It is possible to prevent the screw forming part, the cap skirt fastening part and the container part from being damaged. Further, it is possible to prevent deformation of the container mouth portion and the cap while improving the molding speed without increasing the pressing force from the side surface more than necessary.

  Furthermore, since the screw forming roller contacts the cap after it has been rotated in advance, the contact rotation with the cap can be performed smoothly, preventing slipping and splashing between the roller and the cap at the start of screw forming or hem fastening forming. As a result, it is possible to prevent the occurrence of scratches, dents and the like on the cap, and to prevent the occurrence of defective thread formation, thereby improving the quality. In addition, since each roller that rotates positively rolls and contacts the peripheral surface of the cap and molding is performed, it is possible to equalize the pressing force and suppress variation in the depth of the screw groove due to the screw forming roller. Since the hem fastening is performed stably, the cap can be reliably locked to the container mouth portion even if the speed is increased.

  In addition, since the screw forming roller is rotated in advance and then brought into contact with the cap, slipping and splashing of the contacting roller can be suppressed, and wear and roughness of these roller forming surfaces can be prevented and durability can be improved. be able to.

  In addition, torque transmission is performed between the pressure unit and the rollers by the contact member that is expanded and contracted by the fluid, so that each roller can be rotated in advance before the cap contacts.

  Hereinafter, the present invention will be described with reference to specific examples. First, the container which is the object of the present invention is a so-called resealable metal container having a cap attached to its mouth with a screw. The metal plate as the material includes an aluminum plate, an aluminum alloy plate, and tin-free. Surface-treated steel sheets such as steel, tinplate, chrome-plated steel sheets, aluminum-plated steel sheets, nickel-plated steel sheets, and other various alloy-plated steel sheets can be used. Moreover, the raw material which coat | covered the surface which should become the can inner surface side of a metal plate with a thermoplastic resin can also be used. This can body is a three-piece can reseal can consisting of a can body, a cap and a bottom lid, or a can, re-drawn can, stretch can, squeezed iron can, impact can, etc. It is possible to make a two-piece can type reseal can in which a cap is attached to a seamless can body formed by a screw. Alternatively, the top dome is molded at the bottom of the seamless can body, the neck and shoulders are molded, the cap is wrapped around the screw formed on the mouth and neck, and the neck is at the opening at the bottom of the can body Other containers such as bottle-shaped cans that are subjected to in processing and flange processing and whose bottom lid is wound can be used.

  On the other hand, the cap is made of metal, is roll-on molded by a capping device to be described later on the container mouth, forms a screw groove in the cylindrical portion of the skirt portion of the cap, and skirts the skirt hem portion, A so-called pilfer proof function is provided.

  The material of the cap is not particularly limited. For example, a metal material such as an aluminum alloy plate coated with an epoxy-phenol resin in which an olefin resin powder is dispersed on the inner surface side is used. Also, as the material of the liner, for example, a conventionally known resin material such as a blend material of low density polyethylene and ethylene-propylene copolymer synthetic rubber, a blend material of polypropylene and a styrene elastomer, a polyester elastomer is used. .

  In the rough cap material, the part where the screw part is formed is left as a cylindrical part on the skirt part that hangs downward from the peripheral edge of the top plate part through the corner part. A pilfer proof band is formed at the hem so as to be separable by the weakened portion. A sealing resin liner member is integrally attached to the inner surface of the top plate portion of the cap.

  On the other hand, as shown in FIG. 6, a container 9 to which the cap 1 is attached is a can container 9 having a screwed mouth portion 10 that can be resealed by the cap 1, and is manufactured from a thin metal plate. The end portion of the mouth portion 10 of the can container 9 is formed with a curled portion 11 having a circular cross-section or a multilayer bent structure at the upper end, and an inclined wall 12 that extends downward below the curled portion 11. A male thread portion 13 that is a screw thread for screwing the cap 1 is formed, and a convex bead 14 is formed below the male thread portion 13. An annular bead 15 that is recessed inward in the radial direction is formed in the lower portion. Therefore, the lower end portion of the pilfer proof band 7 is engaged with the inclined surface that is a boundary portion between the convex bead 14 and the annular bead 15.

  By the way, as shown in FIG. 6, when the cap 1 is attached to the container mouth portion 10, the cap 1 is put on the container mouth portion 10 from above and a capping device as described later is used. While applying the stopper pressure to the top plate 2 of 1, the female screw portion 45 (so as to match the cylindrical portion of the skirt portion of the cap 1 and the male screw portion 13 of the container mouth portion 10 by roll-on molding with a screw forming roller. The lower end portion of the pill fur proof band 7 formed at the skirt portion of the skirt portion of the cap 1 is locked to the inclined surface of the convex bead 14 of the container mouth portion 10 by a skirt fastening roller. The hem is tightened.

  A cross-sectional view of the main part of the capping apparatus of the present invention is shown in FIG. As described above, the two or more screw forming rollers 16 and the two or more hem fastening rollers 17 are alternately arranged, and each of the rollers 16 and 17 moves along the central axis of the forming head 20 by the vertical movement of the operation cam 27. The stainless steel material is generally used as the material, and a durable super hard material is also used. Further, the screw forming roller shaft 28 and the bottom fastening roller shaft 29 are rotatably held by a spindle unit 18 (to be described later) with their respective axis lines directed vertically. A cam follower (driven member) that contacts the operating cam 27 at the tip of the upper arm portion 30 is attached to the upper and lower ends of the screw forming roller shaft 28 in a state of protruding in the radial direction. ) 32 is attached. Further, a screw forming roller 16 is held at the tip of the lower arm portion 31 so that its axis is directed in the vertical direction and is rotatable. Similarly, arm portions 33 and 34 are attached to both upper and lower end portions of the hem fastening roller shaft 29 in a state of projecting in the radial direction, and a cam follower ( A driven member 35 is attached. Further, the bottom fastening roller 17 is held at the tip of the lower arm portion 34 so that its axis is directed in the vertical direction and is rotatable.

  Further, between the screw forming roller shaft 28 and the bottom fastening roller shaft 29 and the spindle unit 18, the cam followers 32 and 35 are arranged in a direction approaching the operation cam 27, and the screw forming roller 16 and the bottom fastening roller 17 are respectively provided. Torsion coil springs 36 and 37 for applying a twisting force to the screw forming roller shaft 28 and the stationary roller shaft 29 are provided in the direction approaching the cap 1, respectively.

  On the other hand, as shown in FIG. 5, the operation cam 27 is a so-called drum-shaped three-dimensional cam having a curved constricted portion 38 at the center, and the cam followers 32 and 35 enter the constricted portion 38. Thus, each of the rollers 16 and 17 approaches the cap 1 side. The minimum outer diameter of the constricted portion 38 is preferably set so that the cam followers 32 and 35 are separated from the constricted portion 38 when the rollers 16 and 17 are forming the cap 1. With such a configuration, the elastic forces of the torsion coil springs 36 and 37 can be effectively and uniformly applied even if the axes of the operating cam 27 and the cap 1 do not completely coincide.

  4 and 5, an upper cam 39 that is a cylindrical cam for raising and lowering the molding head 20 including the pressurizing unit 19 and the spindle unit 18 and cam followers 32 and 35 attached to the spindle unit 18 are provided. A lower cam 40 for moving the operating cam 27 up and down for moving the rollers 16 and 17 in the radial direction is provided around a fixed portion (not shown) of the apparatus. These cams 39 and 40 are cylindrical groove cams. Cam followers 42 and 43 are engaged with the cams 39 and 40, respectively. The molding head 20 is moved up and down in accordance with the movement of the upper cam follower 42, and the sleeve 26, that is, the operating cam 27 is moved up and down in accordance with the movement of the lower cam follower 43.

  The upper cam 39 and the lower cam 40 will be further described. The upper cam 39 has an elevating orbit part (AB, GH) for raising and lowering the molding head 20 and a stoppering orbit part (BG) for pressing the top plate part 2 of the cap 1. Note that the corner portion of the cap 1 may be deformed in the molding process corresponding to the plugging track portion. One lower cam 40 is arranged side by side with the upper cam 39, and its track portion is operated with an elevating track portion (AB, GH) that moves the operating cam 27 up and down as the forming head 20 moves up and down. Only the cam 27 is moved up and down to move the cam followers 32 and 35 in the radial direction, and the screw forming roller 16 and the hem fastening roller 17 that move integrally with the cam followers 32 and 35 are pressed against the circumferential surface of the cap to form the screw and hem. It has a screw for tightening and a hem tightening orbiting portion (CF).

  FIG. 6 is an enlarged view of a portion of the hem fastening roller 17 described above. The hem fastening roller 17 is a disk-shaped member formed integrally with the lower end portion of the shaft portion 17A, and the outer peripheral portion thereof is The inclined portion 17B is inclined so as to gradually become thinner so as to enter the lower side of the convex beat 14 in the mouth portion 10. Further, the outer peripheral surface has a shape that follows the outer peripheral surface of the annular bead 15 in the mouth portion 10, and specifically, it is a substantially flat cylindrical surface in the axial direction. Such a shape is a shape for increasing the contact width or area when the skirt roller 17 contacts the annular bead 15 during the hem forming process, but an upper limit and a lower limit are set. It is preferable. Specifically, the contact width L of the skirt roller 17 with respect to the outer peripheral surface of the annular bead 15 is preferably set in the range of 0.2 to 1.5 mm in consideration of the durability of the roll.

It will be explained for action of the above forming head 20 and capping device. As shown in FIG. 4, the molding head 20 is pulled up above the container 9 at the time when the container 9 with the cap rough profile 1 covered by the mouth portion 10 is supplied onto the molding table 24. Subsequently, the entire forming head 20 is lowered by the action of the upper cam 39 and the lower cam 40, and the pressure unit 19 is pressed against the top plate portion 2 of the cap 1. In that case, the top plate portion 2 and the corner portion of the cap 1 are deformed by a pressure unit (described later) constituting the pressurizing unit 19, and the liner member 8 is brought into close contact with the curled portion 11.

  Next, since the lower cam 40 is a track portion (C-D) that descends relative to the upper cam 39, the sleeve 26 and the operating cam 27 integral therewith are lowered, and as a result, each cam follower. 32 and 35 move inward in the radial direction according to the shape of the operating cam 27, and the rollers 16 and 17 move accordingly. The spindle unit 18 holding the rollers 16 and 17 is rotated around the central axis of the forming head 20, and the rollers 16 and 17 revolve around the cap 1 accordingly. 16 and 17 begin to form while rolling and contacting the cap 1.

  On the other hand, each of the rollers 16 and 17 is suppressed (pressed) against the cap 1 by the elastic force of the torsion coil springs 36 and 37 attached to the roller shafts 28 and 29, so that the cap 1 is deformed by the elastic force. To form. That is, the screw forming roller 16 deforms the cylindrical portion 5 of the cap 1 so as to enter the portion corresponding to the valley of the male screw portion 13 formed in the mouth portion 10, and revolves around the cap 1 in this state. Therefore, the screw turns spirally so as to be guided by the male screw portion 13, and as a result, a screw groove along the male screw portion 13, that is, a female screw portion 45 is formed in the cylindrical portion 5 of the cap 1.

  On the other hand, the skirt fastening roller 17 performs the skirt fastening of the pilfer proof band 7 by gradually approaching the cap 1 while revolving around the cap.

  The operating cam 27 is pulled up on the track portion from the symbol E to the symbol F in FIG. As a result, the cam followers 32 and 35 are moved outward in the radial direction, and the rollers 16 and 17 are moved outward in the radial direction and separated from the cap 1. Thereafter, the upper cam 39 and the lower cam 40 both rise to a track portion (GH). As a result, the molding head 20 is pulled up from the container 9 and a series of capping steps is completed.

  As described above, in the forming head or capping device according to the present invention, torque for rotating the screw forming roller 16 and the bottom fastening roller 17 is applied between the non-rotating pressure unit 19 and the rotating spindle unit 18. Although it is configured to be generated by relative rotation, in addition to such a configuration, in the present invention, before the screw forming roller 16 and / or the cuff roller 17 contacts the cap 1, the roller is moved in the forward direction. The screw forming roller 16 and / or the bottom tightening roller 17 are rotated in advance by providing a rotation means for rotating the screw forming roller 16 and / or the hem fastening roller 17. FIG. 1 shows an example of the pressure unit 19, the screw forming roller 16, and the bottom tightening roller 17 when the roller is synchronously rotated in the forward direction in advance.

  As shown in FIG. 1, a sleeve 47 whose axis is directed in the vertical direction is provided on the lower arm portion 34 that receives elastic force so as to move toward the cap 1 side by the above-described configuration. It is attached so that it can move up and down relatively, and the height position of the bottom fastening roller 17 can be adjusted with respect to the position with the annular bead 15 in the mouth part 10. Inside the sleeve 47, the shaft portion 17A of the bottom fastening roller 17 is inserted from below and is held rotatably. The shaft portion 17A protrudes upward from the sleeve 47. At the protruding portion, the spline or the press roller 48 can slide in the axial direction with respect to the shaft portion 17A and rotate integrally with the shaft portion 17A. Attached via serrations.

  The pressure block 19 </ b> A constituting the pressurizing unit 19 is attached to the lower end portion of the pressure rod 21 that is disposed inside the spindle shaft 22 so as to be reciprocally movable in the vertical direction. In addition, a push pin 61 is provided at the central portion of the pressure unit 19. The push pin 61 is urged downward by a spring 61 </ b> A so that the cap 1 is not obliquely covered with the container mouth portion 10.

  Further, a contact member 49B is provided around the pressure unit 19 as a rotating means. The contact member 49B and the air supply port 52 communicate with each other via an air hole 53, and the air supply port 52 is connected to an air pressure source such as an air compressor (not shown). The contact member 49B is configured such that a cylindrical rubber hollow body can expand and contract in response to the inflow / outflow of air. For the contact member 49B, a pneumatic holder “Air Picker” (registered trademark) or the like that is expanded outward from Bridgestone Corporation can be used.

The pressure roller 48 is in contact with the contact member 49B to transmit torque by a frictional force, and they change the distance between the center axis of the contact member 49B and hem tightening roller 17, can be maintained contact with it. The outer peripheral portion is formed of an elastic body 49A such as rubber. The elastic force of the elastic body 49A may be in a range where torque can be transmitted. As an example, the hardness is preferably about JIS Hs60. The outer diameter of the pressure roller 48 is such that the pressure roller 48 comes into contact with the outer peripheral surface of the contact member 49B before the bottom roller 17 contacts the lower edge of the cap 1 when the contact member 49B is expanded. The outer diameter to be transmitted is set.

  The hem fastening roller 17 having the configuration shown in FIG. 1 is moved toward and away from the cap 1 by the lower cam 40 described above. When approaching the cap in order to perform skirt tightening, first, the press roller 48 contacts the outer peripheral surface of the contact member 49B before the skirt roller 17 contacts the cap.

  The pressurizing unit 19 provided with the contact member 49B is for pressing the top plate portion 2 of the cap 1 or molding the corner portion 3, and is not rotated. The spindle unit 18 holding the hem fastening roller 17 rotates around the central axis of the forming head 20, and the hem fastening roller 17 revolves around the pressure unit 19. By contacting the outer peripheral surface of the member 49B, torque is transmitted by the frictional force between them, and the pressure roller 48 rotates and rotates in the same direction as the rotation direction of the spindle unit 18, that is, in the forward direction ((a in FIG. 2). )).

  When the skirt tightening roller 17 further approaches and hem tightening is started, the air of the contact member 49B is removed and the contact member 49B contracts. Then, the torque is transmitted from the rotating cap 1 to the bottom fastening roller 17, and the rotation of the bottom fastening roller 17 is maintained ((b) in FIG. 2).

  Since the press roller 48 is configured to rotate integrally with the shaft portion 17A of the skirt roller 17, the skirt roller 17 to which torque has been transmitted to the hem roller 17 via the press roller 48 is eventually When the hem fastening roller 17 is further moved inward in the radial direction and comes into contact with the cap, it rotates relatively synchronously depending on the contact with the cap 1. Therefore, there is almost no rotational deviation between them, and as a result, there is no slip between the bottom fastening roller 17 and the lower end edge portion of the cap, and wear and roughness of the molding surface of the bottom fastening roller 17 can be prevented in advance. Further, it is possible to perform skirt fastening of the cap with excellent appearance by suppressing the occurrence of scratches and dents on the cap.

  On the other hand, the thread forming roller 16 can be similarly configured. That is, in addition to the configuration in which the torque for rotating the screw forming roller 16 is generated by the relative rotation between the non-rotating pressurizing unit 19 and the rotating spindle unit 18, the screw forming roller 16 has a cap. It is also possible to provide a rotating means for positively rotating the screw forming roller 16 before contacting the screw 1, so that the screw forming roller 16 and the cap 1 are rotated in advance. An example is shown in FIG.

  As shown in FIG. 1, a sleeve 54 whose axis is directed in the vertical direction is attached to the lower arm portion 31 receiving elastic force so as to rotate toward the cap 1 side. A shaft portion 16A of the screw forming roller 16 is inserted into the inside from below and is held rotatably. The shaft portion 16A protrudes upward from the sleeve 54, and the pressing roller 51 is configured to slide in the axial direction and rotate integrally with the protruding portion. The shaft portion 16A and the pressure roller 51 are configured to rotate together (details will be described later). Further, as shown in FIG. 3, the shaft portion 16 </ b> A may be screwed into the pressure roller 51.

  The pressure contact roller 51 contacts the contact member 49B to transmit torque by frictional force, and can maintain the contact state even if the distance between the contact member 49B and the center axis of the screw forming roller 16 changes. Further, the outer peripheral portion is formed by an elastic body 50 such as rubber, and the elastic force of the elastic body 50 may be in a range where torque can be transmitted. As an example, the hardness is preferably about JIS Hs60. The outer diameter of the pressure roller 51 is set to an outer diameter that transmits the torque by the pressure roller 51 contacting the outer peripheral surface of the contact member 49B before the screw forming roller 16 contacts the cap 1 when the contact member 49B is expanded. Is set.

  The screw forming roller 16 having the configuration shown in FIG. 1 is moved toward and away from the cap 1 by the lower cam 40 described above. When approaching the cap in order to perform screw forming, first, the pressure contact roller 51 contacts the outer peripheral surface of the contact member 49B before the screw forming roller 16 contacts the cap.

  As described above, the contact member 49B does not rotate. On the other hand, the spindle unit 18 holding the screw forming roller 16 rotates about the central axis of the forming head 20, and the screw forming roller 16 is rotated. Is revolving around the pressure unit 19, the pressure roller 51 comes into contact with the outer peripheral surface of the contact member 49B, whereby torque is transmitted by the frictional force between them, and the pressure roller 51 rolls and rotates. ((A) of FIG. 2).

  When the screw forming roller 16 further approaches and screw forming is started, the air of the contact member 49B is extracted, the contact member 49B contracts, and the screw forming roller rotates and rolls without slipping around the cap. . ((B) of FIG. 2).

  Since the press roller 51 is configured to rotate integrally with the shaft portion 16A of the screw forming roller 16, the screw forming roller 16 that has been transmitted with torque to the screw forming roller 16 through the press roller 51 eventually becomes When the screw forming roller 16 is further moved inward in the radial direction and comes into contact with the cap, it rapidly rotates synchronously depending on the contact with the cap. Therefore, there is almost no rotational deviation between them, and as a result, there is no slip between the screw forming roller 16 and the cap 1, wear and roughness of the forming surface of the screw forming roller 1 can be prevented, and scratches and dents can be prevented. Cap formation can be performed while suppressing the occurrence of scratches.

  In FIG. 4, the expansion of the contact member 49 </ b> B is started between the top surface molding and the screw / hem fastening, and the press roller 51 comes into contact with the outer peripheral surface of the contact member 49 </ b> B immediately before the screw / hem fastening molding is started. Then, torque is transmitted and rotation of the screw forming roller 16 is started ((a) in FIG. 2). Then, when screw forming is started and screw / hem fastening is started, the contact member 49B contracts (FIG. 2 (b)), and this time, depending on the contact with the cap, the screw forming rollers 16, 17 The rotation of is maintained.

  Note that the rotating means for rotating the skirt roller 17 before the start of the hem fastening molding is such that the circumference of the cap is short when the diameter of the container mouth, that is, the outer diameter of the cap is smaller than 30 mm. Although there is no problem, if the outer diameter of the cap is larger than that, it is easier to make the hem tightening of the container mouth part by making the hem tightening while applying the rotational force to the hem tightening roller 17 in advance. It is possible to reduce the processing loss due to slip. In particular, when the weld can body is a container 9 and the cap is covered with a cap having a large diameter of 40 mm or more and the cap is rolled on, the contact length becomes long and the durability of the rollers 16 and 17 is increased. And is effective in terms of molding stability. As the rotating means, a rotating mechanism such as a gear can be used in addition to the above-mentioned pressure contact roll.

In the molding head 20 shown in FIG. 1 or FIG. 2 described above, torque is transmitted from the pressure unit 19 to the shaft portion 17A of the bottom fastening roller 17 via the contact member 49B to forcibly rotate the bottom fastening roller 17. It will be . Therefore, even when the hem fastening roller 17 is brought into contact with the outer peripheral surface of the annular bead 15 by the abutting portion 44 and the skirt fastening molding is performed, the container mouth is prevented from being deformed due to the rotation failure of the hem fastening roller 17, and the cap Can be reliably engaged.

  On the other hand, as shown in FIG. 3, you may comprise so that rotation of the press-contact roll 51 may be performed also during screw shaping | molding. A sleeve 54 with the axis line directed in the vertical direction is attached to the lower arm portion 31 receiving elastic force so as to rotate toward the cap side by the torsion coil spring described above, and inside the sleeve 54, A shaft portion 16A of the screw forming roller 16 is inserted from below and is rotatably held. An upper pin shaft 71 is coupled to the shaft portion 16 </ b> A by a screw, and is configured to be able to slide in the axial direction while rotating integrally with the press contact roll 51. The upper pin shaft 71 and the pressure roller 51 are supported on the arm 31 by a support 72.

  The upper pin shaft 71 is not a complete cross-section round shaft but a D-axis with a part cut away. On the other hand, a hole 76 through which the upper pin shaft 71 provided in the pressure roller 51 passes is also a perfect circular hole. It is a D hole that is partially missing. Accordingly, the pressure roller 51 and the upper pin shaft 71 are D-coupled and rotate together. Further, since the upper pin shaft 71 and the screw forming roller 16 are connected via the shaft portion 16A, the upper pin shaft 71 and the screw forming roller 16 are integrally rotated and moved in the vertical direction. A buffer material 70 is provided around the pressurizing unit 19.

  The screw forming roller 16 having the configuration shown in FIG. 3 is a process in which the screw forming roller 16 approaches the cap in order to perform screw forming. It contacts the outer peripheral surface of the cushioning material 70.

  The pressure unit 19 provided with the cushioning material 70 is for pressing the top plate portion 2 of the cap or molding the corner portion 3 and is not rotated. The spindle unit 18 holding the forming roller 16 rotates around the central axis of the forming head 20, and the screw forming roller 16 revolves around the pressure unit 19. The outer peripheral surface of the roller 70 comes into rolling contact, and torque is transmitted by contact friction between the two, and the press roller 51 rotates. Since the pressure roller 51 rotates integrally with the screw forming roller 16, the screw forming roller 16 also rotates before contacting the cap.

  Even when the screw forming by the screw forming roller 16 is started, the contact between the pressure contact roller 51 and the cushioning material 70 is maintained. Since the upper pin shaft 71 is configured to be movable in the axial direction with respect to the sleeve, the upper pin shaft 71 rotates as the screw forming roller 16 moves downward as the screw forming proceeds. It moves downward and a screw is formed.

  Even when the screw forming is started, the contact between the pressure contact roller 51 and the cushioning material 70 is maintained, and torque is positively transmitted to the screw forming roller 16 during the screw forming of the cap. For this reason, the fluctuation | variation of the rotation speed by the resistance at the time of shaping | molding of a screw | thread, a slip, etc. can be suppressed.

  In addition to the capping of reseal cans using a welded can body, the present invention can also be applied to capping bottle-type cans that have no seams on the side of the can body. Further, it can be applied to at least one of a hem fastening roller and a screw forming roller, and is effective when speeding up the screw forming operation. Furthermore, although the number of hem fastening rollers is generally two or more in the forming head, the present invention is not limited to this and may be three or more.

  Similarly, when winding twice, it is also possible to apply.

It is sectional drawing which shows the example of the shaping | molding head using a pressure roller. It is a fragmentary figure which shows the process of the skirt fastening molding by the skirt fastening roller. It is sectional drawing which shows the example which provided the elastic body which transmits a torque to a skirt fastening roller in the pressurization unit. 1 is a capping device according to the present invention configured to perform screw / hem fastening once. It is a schematic diagram of the principal part in the capping apparatus of this invention. It is sectional drawing which expands and shows a part of skirt fastening molding part which concerns on this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Cap (rough cap shape material), 9 ... Can container, 10 ... Container mouth part, 13 ... Male screw part, 14 ... Convex bead, 15 ... Annular bead, 16 ... Screw forming roller, 17 ... Hem fastening roller, 17B DESCRIPTION OF SYMBOLS ... Inclination part, 19 ... Pressure unit, 20 ... Forming head, 44 ... Contact part, 45 ... Female thread part, 48 ... Pressure contact roller, 49B ... Contact member, 51 ... Pressure contact roller, 70 ... Buffer material.

Claims (2)

A pressurizing unit for pressing the covered et a metallic caps coarsely shaped member to the container mouth portion toward the container opening, around the periphery of the pressurizing unit, toward and away from the said cap coarse profile In a capping device including a spindle unit with a thread forming roller
A screw forming roller rotating means for applying a forward rotational force to the screw forming roller in advance when the cap rough shape is approached;
The screw forming roller rotating means is provided on the outer periphery of the pressure unit and transmits a rotational torque to a roller shaft to which the screw forming roller is attached. The screw forming roller rotating means is provided on the roller shaft and is in contact with the contact member. And a pressing roller that rotates.
The capping device is characterized in that the contact member is configured by a mechanism that can be expanded and contracted by fluid pressure when approaching and separating from the rough cap member. A hem fastening roller that skirts and forms a skirt portion of the metal cap rough shape material close to and away from the metal cap rough shape material, and the hem fastening roller when close to the cap rough shape material And a hem fastening roller rotating means for applying a forward rotational force in advance to
  The skirt tightening roller rotating means is provided on the outer periphery of the pressure unit and is rotated on the other roller shaft on which the hem tightening forming roller is attached and the other roller shaft in contact with the contact member. Including other pressure roller
The capping device according to claim 1, wherein:

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