JP2005145522A - Capping method and apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform capping by preventing deformation and buckling of a flange / neck portion in which a lower end portion of a trunk portion is opened.
A metal cap rough profile is formed in the mouth portion of a metal container having an opening portion having a flange portion formed at a lower end and a mouth portion having a thread formed at an upper end. A capping method in which the cap rough shape member 35 is screw-formed by the screw forming roll 12 in a state where the top plate portion of the cap rough shape member 35 is pressed toward the mouth portion 34 by the pressure unit 9. The flange portion 42 is brought into contact with a support member 46 having a cross-sectional shape corresponding to the shape of the flange portion 42 and the top plate portion of the rough cap member 35 is pressed by the pressurizing unit 9. Thus, after the container 31 is sandwiched between the pressurizing unit 9 and the support member 46, the rough cap member 35 is screw-formed.
[Selection] Figure 1

Description

  The present invention is a bottomed cylindrical and threaded part formed as a cap at the mouth of a container in which a threaded part is formed in advance in a capping operation of a container having low rigidity such as a metal bottle-shaped can. The present invention relates to a capping method for covering a rough shape of a cap without a cap and forming a threaded portion on the peripheral surface of the rough shape of the cap, and an apparatus for carrying out the method.

  Usually, the metal cap of a container is comprised by the top plate part and the skirt part (or cylindrical part) drooping from the outer periphery. And the cap rough shape material is put on the mouth portion of the container, and then the skirt portion of the cap rough shape material is pressed from the outside by a screw forming roll, and has a female screw portion that matches the male screw portion of the container mouth portion. A cap is formed. The process of forming the top plate of the rough cap material covering the mouth portion of the container, screw forming, and skirt fastening is called roll-on capping, and examples of the capping device are disclosed in Patent Document 1 and Patent Document 2. Has been described. The capping device described in these patent documents is configured to perform capping by forming a screw portion on the outer surface of the skirt portion of the rough cap material covering the mouth portion of the container and by narrowing the skirt skirt portion inward. Has been. That is, the screw forming roll is pressed from the outside of the cap to form the female screw portion on the cap, while the hem fastening roll is pressed to the lower side of the annular convex portion of the container mouth portion to perform the skirt fastening.

  The screw forming roll and the skirt fastening roll are moved by a screw forming roll opening / closing mechanism and a skirt fastening roll opening / closing mechanism that raise and lower a conical cam (also referred to as a cone cam) and apply a controlled radial force. And a predetermined female screw part is shape | molded into a cap rough shape material by rolling the outer surface of a cap rough shape material so that a screw forming roll may follow the male screw part previously provided in the opening part of the container. . On the other hand, the hem fastening roll rotates along the lower surface of the annular convex portion formed in advance at the mouth portion of the container, and as a result, a predetermined hem fastening portion is drawn in the rough cap material.

  The molding head having the above-mentioned structure, which has been known so far, is tightened by narrowing the skirt skirt of the cap rough profile material inwardly, and two or more screw forming rolls for threading the rough profile profile. Two or more hem fastening rolls for forming are provided. And as above-mentioned, the movement of these rolls to the radial direction is comprised by raising / lowering a conical cam.

  As the rough cap material used in this type of apparatus, a material having good workability made of a thin plate made of aluminum alloy or steel is used. Therefore, the pressing force for pressing the screw forming roll and the skirt fastening roll against the rough cap member is generated by an elastic member such as a torsion spring. Accordingly, the screw forming roll opening / closing mechanism and the skirt fastening roll opening / closing mechanism are configured to guide the screw forming roll and the skirt fastening roll to the outer peripheral surface of the cap rough shape member and to retreat them. More specifically, the screw forming roll opening / closing mechanism and the bottom fastening roll opening / closing mechanism move the screw forming roll and the bottom fastening roll to the center side by moving the cone cam in the axial direction, and the screw forming roll and the bottom fastening roll are caps. After the abutting against the rough shape material at the same time, each roll presses the outer surface of the rough shape material of the cap by the elastic force of each torsion spring, so that the screw forming and the skirt fastening are simultaneously performed.

  On the other hand, as a bottle-shaped can made of such a thin metal plate, a cap is screwed into the mouth portion of the container body integrally formed with a small-diameter round portion, a shoulder portion, and a large-diameter barrel portion having a shape similar to that of a plastic bottle. A bottle-shaped can that has been molded and fixed, and that is configured so that the lower end opening of the body opposite to the mouth is sealed by fastening the separate bottom lid, has already been commercialized by the applicant. Has been.

  However, when the bottle-shaped can as described above is filled and sealed, it has a larger diameter (inner diameter is 45 mm) than that of a normal container (such as a two-piece can or a three-piece can having a wide opening). In order to fill the contents from the small-diameter mouth portion (the inside diameter of the mouth portion is 35 mm or less) instead of from the wide opening portion of the body portion described above, the nozzle diameter of the filling nozzle is reduced, the filling speed is reduced, and the filling efficiency is reduced. There is a disadvantage of lowering. Therefore, the production efficiency in the production line is lowered, and the equipment used for filling and sealing the container having a normal wide opening cannot be used as it is. Therefore, the container in which the cap is screwed around the container mouth is continuously transported in an inverted state with the screwed cap side down and the body opening is up, and each container in the inverted state On the other hand, Patent Document 3 has already proposed a method in which the bottom lid is fastened and fixed to the opening of the barrel by a can lid clamping machine of existing equipment after filling the contents from above through the opening of the barrel. Has been.

According to the filling / sealing method described in Patent Document 3, the equipment used for filling / sealing ordinary containers can be adjusted by using a holder having an appropriate height in the production line. As a result, it can be filled not from the small-diameter container opening side but from the wide opening side of the large-diameter barrel, and filling and sealing can be performed at high speed.
JP-A-1-99967 JP-A-47-41979 JP 2002-128193 A

  In general, as a container having a reseal mechanism that can be resealed after opening, such as a bottle-shaped can, a container in which a body part and a bottom part are formed as an integral wall, or a bottom cover in advance at the opening part of the body part. Although a container that has been tightly wound is known, the invention described in Patent Document 3 does not use a container having a bottom as described above, but uses a container in which an opening of a trunk is opened. The container is detachably inserted into the holder so that the cap is tightened with the cap tightening side down and the trunk opening is upside down. Then, the bottom lid is wound and fixed to the opening of the trunk by an existing can lid clamping machine and sealed. In addition, when the diameter of the container mouth part is close to the trunk part, the holder may not be used because it does not fall down.

  Therefore, in the above-described invention of Patent Document 3, the capping operation is performed with the lower end portion of the trunk portion being opened. Therefore, in the capping operation, screw molding and hem fastening are performed with the top plate of the cap pressed, so that an axial pressing force acts on the barrel, and this load is applied to the opening at the lower end of the barrel. It will be received in the department. As a result, the cap / pressing force during capping causes the flange / neck portion of the body opening to bend or cramp, and the necessary shape of the flange deforms when the bottom cover is tightened after filling the contents. As a result, there was a problem that the bottom cover could not be normally tightened.

  In addition, when the container body receives a forming load from the lateral direction by the screw forming roll in addition to the pressing force from above during capping, the bottom cover is not tightened on the bottom end of the body, The opening has a low rigidity, and the opening is likely to be distorted, so that there is a problem that a normal capping operation cannot be performed.

  The present invention has been made paying attention to the technical problems described above, and covers the mouth of the container with the open end of the container body covered with a rough cap material, and the peripheral surface thereof is screw-formed or skirted. When performing capping for processing such as fastening molding, the flange part at the lower end of the body part is prevented from being bent and deformed, and after filling the contents through the opening part of the body part from above, the body part is opened. It is an object of the present invention to provide a capping method and a capping device capable of normally tightening a bottom lid on a part.

  In order to achieve the above object, the invention of claim 1 is characterized in that the mouth portion of the metal container having an opening portion having a flange portion formed at the lower end and a mouth portion having a screw portion formed at the upper end. The cap rough shape material is covered with a metal cap, and the cap rough shape material is screw-formed by a screw forming roll in a state where the top plate portion of the cap rough shape material is pressed toward the mouth portion by the pressing member. In the method, the flange portion is brought into contact with a support member having a cross-sectional shape corresponding to the shape of the flange portion, and the top plate portion of the rough cap member is pressed by the pressing member, thereby pressing the container. In this method, the cap rough profile is screw-formed after being sandwiched between a member and the support member.

  Further, the invention of claim 2 has a metal cap rough shape in the mouth portion of a metal container having an opening portion having a flange portion formed at the lower end and a mouth portion having a screw portion formed at the upper end. In the capping method in which the cap rough shape material is screw-formed by a screw forming roll in a state in which the top plate portion of the cap rough shape material is pressed toward the mouth portion by a pressing member, A carrying-in process of carrying the container covered with the cap between a forming head for forming a screw part on the outer peripheral surface of the cap and a forming table; and lowering the forming head to press the cap top plate part with the pressing member. A pressing step of lowering the container from the molding table surface by the pressing force and holding the lower end of the container with a support member having a cross-sectional shape corresponding to the shape of the flange, and a molding roll of the molding head A screw forming step for forming a screw portion on the outer peripheral surface of the cap, a lifting step for raising the container to the molding table surface as the molding head rises after the screw molding, and a screw molding process for raising the container to the molding table surface An unloading step of unloading the container to the next step.

  Furthermore, the invention of claim 3 is the method of claim 2, wherein when the container is lowered from the molding table surface, the outer peripheral portion of the flange portion has an annular force that opposes the pressing force of the pressing member. It is a method characterized by supporting from below with a member.

  On the other hand, the invention of claim 4 has an opening having a flange portion formed at the lower end and a mouth of a metal container having a mouth portion formed with a screw portion at the upper end. Place the container on the molding table and press the top plate of the cap against the molding table by the molding head while rolling the molding roll provided on the molding head around the cap to the outer peripheral surface of the cap. In the capping device for forming a threaded portion, a support member provided on the forming table at a position facing the forming head and having a cross-sectional shape corresponding to the shape of the flange portion, and upward toward the outer peripheral portion of the support member And an annular member that is elastically biased and is arranged so as to be movable up and down and elastically supports the outer peripheral portion of the flange portion.

  According to the method of the present invention according to claim 1, a metal cap is provided at the mouth of a metal container having an opening with a flange formed at the lower end and a mouth formed with a screw at the upper end. In the capping method of rolling the screw forming roll around the cap while pressing the top plate portion of the cap with the pressing member, and forming the screw portion on the outer peripheral surface of the cap, the shape of the pressing member and the flange portion is After sandwiching the container with the supporting member having the corresponding cross-sectional shape, the threaded portion is formed on the outer peripheral surface of the cap, so that the body opening of the thin plate can be prevented from being distorted and the opening is opened. It is possible to prevent the flange / neck portion from being bent or deformed. Therefore, even if the container body part and the bottom part are not formed as an integral wall, that is, a container in which the bottom lid is not fixed in advance to the opening end of the container body part, the container mouth part is covered with a cap. The screw can be formed, and the contents can be filled at high speed from the opening side of the capped container. When the bottom cover is wound around the opening after filling, the winding failure is prevented. be able to.

  According to the invention of claim 2, a metal cap is placed on the mouth portion of a metal container having a mouth portion in which a flange portion is formed at the lower end opening of the container and a screw portion is formed at the upper end. A carrying-in step of carrying in between a forming head for forming a screw part on the surface and the forming table; and lowering the forming head to press the cap top plate part with a pressing member of the forming head, and the container is moved by the pressing force. Lowering from the molding table surface and holding a lower end portion of the container with a support member having a cross-sectional shape corresponding to the shape of the flange portion, and forming a screw portion on the outer peripheral surface of the cap with a molding roll of the molding head Next to the screw forming step, after the screw forming, a lifting step of raising the container to the forming table surface as the forming head rises, and a screw-formed container raised to the forming table surface And the unloading step for unloading, it is possible to prevent distortion of the body opening of the thin plate and to prevent the flange neck from being bent or deformed. Even an opened container can be screwed with a cap on the container mouth, and after being threaded, the contents are filled through the container opening, and then the opening is covered with a bottom lid. Can be tightened normally.

  Moreover, when the top plate portion of the cap is pressed by the pressing member, the container is lowered from the molding table by the pressing force of the pressing member, and the container is held by the support member having a cross-sectional shape corresponding to the shape of the flange portion. Then, the capping work can be performed, and the support member does not protrude above the molding table surface (feed line). Therefore, when the container is carried in / out along the feed line between the molding head and the molding table In addition, the flange portion is not caught by the support member, and the container can be smoothly put in and out of the molding table. As a result, it is possible to prevent a transport trouble at the time of capping.

  Furthermore, according to the invention of claim 3, in addition to the effect of claim 2, when pressing the top plate portion of the container with the pressing member and lowering the container by the pressing force of the pressing member, the flange neck portion By elastically supporting the outer peripheral part of the container with the annular member, it is possible to prevent the flange part from being deformed or buckled even if the container is pressed down by the pressing member. Further, there is an effect that the container can be easily detached from the support member after capping.

  According to the capping device of the invention of claim 4, in the roll-on capping device, the support having a cross-sectional shape corresponding to the shape of the flange portion of the container on the side of the molding table facing the molding head that presses the cap top plate portion. An annular member disposed on the outer peripheral side of the member and the support member, biased upward, elastically supporting the outer peripheral portion of the flange portion, and capable of moving up and down on the outer peripheral side of the support member By providing the member, it is possible to withstand the load in the axial direction of the container even when the cap top plate portion is pressed, and to prevent the flange / neck portion from being deformed or buckled. Further, a complicated lifting mechanism such as a cam member is not required at the lower part of the container, and the container can be conveyed at a high speed with a simple mechanism.

  Next, the present invention will be described based on specific examples. First, a drive mechanism including a capping device that is the subject of the present invention will be described. The capping device is provided on a screwless cap (cap rough profile) that covers a mouth portion of a threaded container (hereinafter referred to as a container mouth portion). It is a roll-on capping device that performs screw forming, hem fastening, and the like.

  FIG. 5 schematically shows an example of the capping device 1, which includes a molding table 2 on which containers with caps are placed at regular intervals, and a cylindrical shaft 3 that supports the molding table 2 is arranged vertically. It is rotatably held by a fixed shaft 4 that is erected. The fixed shaft 4 includes an inner fixed shaft 4a and an outer fixed shaft 4b that can move up and down. On the upper surface of the molding table 2, a plurality of upper and lower body guides 5 for holding the container body are provided in accordance with the pitch of the container placement portion.

  A frame turret 6 that rotates integrally with the molding table 2 around the fixed shaft 4 is provided above the molding table 2. In the example shown in FIG. 5, the frame turret 6 is configured by three upper, middle, and lower disk portions 6A, 6B, and 6C. The frame turret 6 is held on the molding table 2 at the outer peripheral portion of the frame turret 6. The spindle unit 7 is held at a position corresponding to the vertical upper side of the container. As shown in FIG. 5, a molding head 8 is provided at the lower end of each spindle unit 7.

  As shown in FIG. 5, the spindle unit 7 is moved up and down with respect to the container and rotated, a non-rotating pressure rod 7b provided inside the hollow shaft 7a, The pressure unit 9 attached to the outer peripheral portion of the lower end of the pressure rod 7b protruding to the lower end portion side of the hollow shaft 7a and biased downward by an elastic material (not shown), and the top plate portion of the cap A rod-shaped push pin 10 that is lightly pressed to prevent oblique cover fogging, and a sleeve 11 that is disposed on the outer peripheral side of the hollow shaft 7a and has a cone cam 11a at the lower end thereof are provided.

  Further, a molding head 8 that rotates together with the hollow shaft 7a and moves up and down is attached to the lower end portion of the hollow shaft 7a.

  The forming head 8 has a conventionally known structure, and two or three screw forming rolls 12 for threading the cap, and a pilfer proof band provided at the lower end of the cap. Two or three skirt fastening rolls 13 for skirting the skirt are provided. These rolls 12 and 13 are respectively held by the forming head 8 by a torsion spring 14 having a predetermined elastic force so as to move back and forth in the radial direction toward the central axis of the forming head 8. The cone cam 11a moves up and down, and the cam follower 16 and the torsion spring 14 provided in the molding head 8 are in contact with the cone cam 11a.

  Here, the cam for moving the spindle unit 7 up and down and moving the cone cam 11a up and down will be described. Between the lower disc portion 6C and the intermediate disc portion 6B in the frame turret 6 described above. A frame body 17 extending radially outward from the fixed shaft 4 is provided. Two cam grooves 18 </ b> A and 18 </ b> B are formed along the circumferential direction at two locations above and below the outer peripheral surface of the frame body 17. In the drive mechanism shown in FIG. 5, the cam groove 18A on the opposite side (upper side) toward the molding table 2 is called an upper cam, and the cam groove 18B on the molding table 2 side (lower side) is called a lower cam.

  In FIG. 5, a cam follower 19A engaged with the cam groove 18A of the upper cam is connected to a cylindrical member 20 that rotatably holds the hollow shaft 7a. Further, the cam follower 19B engaged with the cam groove 18B of the lower cam in FIG. 5 is connected to the sleeve 11 integral with the cone cam 11a.

  Accordingly, when the spindle unit 7 revolves around the fixed shaft 4, each cam follower 19A, 19B travels along the cam grooves 18A, 18B. As a result, the cam follower 19A is configured such that the spindle unit 7 and the molding head 8 move up and down according to the shape of the cam groove 18A, and the cam follower 19B moves up and down according to the shape of the cam groove 18B.

  Next, a mechanism for rotating the molding head 8 through the spindle unit 7 will be described. In the example shown in FIG. 5, in order to simplify the overall configuration of the apparatus, a single power source (not shown) is configured to perform all operations, and the frame turret 6 is rotated together with the molding table 2. Accordingly, the hollow shaft 7a and the molding head 8 attached thereto are rotated. Specifically, the sun gear 21 is fixed to the upper part of the fixed shaft 4 slightly below the upper disk part 6A. The planetary gear 22 meshed with the sun gear 21 is rotatably held by the upper disk portion 6A of the frame turret 6.

  A first rotating shaft 23 penetrating the upper disk portion 6A is provided at a position adjacent to the planetary gear 22, and a lower end portion of the rotating shaft 23 is an intermediate portion engaged with the planetary gear 22. A drive timing pulley 25 is attached to an end portion to which the gear 24 is attached and projects upward from the disc portion 6A. Further, at a position close to each spindle unit 7 on the outer peripheral portion of the upper disc portion 6A, the end portion is rotatably held by the intermediate disc portion 6B through the upper disc portion 6A. Two rotating shafts 26 are provided. A driven timing pulley 27 that is paired with the drive timing pulley 25 is attached to the end of the second rotating shaft 26 protruding above the upper disc portion 6A. A driven gear 28 is attached to an intermediate portion of the second rotating shaft 26, that is, a portion located between the upper disc portion 6A and the intermediate disc portion 6B. The driven gear 28 meshes with the elongated gear 29 provided on the outer peripheral portion of the hollow shaft 7a.

  As shown in FIG. 5, a timing belt 30 is wound around one predetermined driving timing pulley 25 and two driven timing pulleys 27 adjacent to each other.

  FIG. 1 shows a detailed configuration of the screw forming roll 12, the hem fastening roll 13, and the pressurizing unit 9, and a detailed configuration of a placement portion on which the container 31 is placed. The screw forming roll 12 is rotatably held at the distal end portion of the open / close arm 32 with the central axis line directed in the vertical direction. The open / close arm 32 is attached to a lower end portion of a pivot shaft (not shown) provided in the molding head 8, the torsion spring 14 is incorporated in the pivot shaft, and the cam follower 16 It is designed to rotate by moving in the radial direction. Such a configuration is the same for the hem fastening roll 13, and the hem fastening roll 13 is held at the tip of the opening / closing arm 33 so that its axis is rotatable in the vertical direction, and the opening / closing arm 33 is molded. A pivot shaft (not shown) provided on the head 8 is attached to the lower end of the pivot shaft. The torsion spring 14 is incorporated in the pivot shaft, and the cam follower 16 moves in the radial direction. It is supposed to be.

  The pressurizing unit 9 prevents the deformation of the pressure block 36 for forming the corner portion of the top plate portion of the rough cap member 35 placed on the mouth portion 34 of the container 31 and the top plate portion during the forming. The pressing pad 37 is provided. The pressure block 36 is attached to the pressure rod 7b by screwing a female screw portion formed on the inner peripheral surface of the upper end portion and a male screw portion formed on the lower end portion of the pressure rod 7b. Therefore, the push pin 10 and the pressing pad 37 correspond to the pressing member of the present invention.

  Further, the lower end portion of the pressure block 36 is formed in a cylindrical shape, and the pressing pad 37 is accommodated therein so that it can move up and down within a predetermined range. The pressing pad 37 is configured to press the top plate portion of the cap by elastic force. A spring pin 38 is provided for preventing the pressing pad 37 from coming out of the pressure block 36. Prior to the substantial forming process, the push pin 10 that holds the rough cap member 35 is held inside the pressure rod 7b. The tip of the push pin 10 has a pressure block 36 and a pressure pad 37. Through the central axis. The push pin 10 may be provided as necessary, and the tip shape may be a disc shape in accordance with the diameter of the cap.

  Next, the configuration of the mounting portion in the molding table 2 which is a characteristic configuration of the present invention will be described. A concave portion 39 is formed in a peripheral portion of the molding table 2, that is, a position facing the molding head 8, and a disk-like container mounting table 40 that holds the container 31 in an upright state is formed on the inner surface of the concave portion 39. Is provided. As shown in FIG. 1, a container 31 placed on the container mounting table 40 has a welded can body 41 having a seam portion on the side surface and an opening diameter close to the body 41 at the upper end and a male surface on the outer peripheral surface. It has the mouth part 34 in which the screw part was formed, and the flange part 42 formed by projecting outward from the lower end opening of the body part 41.

  The container mounting table 40 has a disk shape having an annular hollow portion (concave portion) slightly larger than the outer diameter of the flange portion 42 on the center side, and is a donut shape fitted to the outer peripheral side of the concave portion 39. The pad 43 is provided. The pad 43 is detachably fitted into the recess 39, and the upper surface thereof and the upper surface of the molding table 2 are provided so as to be substantially the same surface, and form a substantially continuous plane. Yes.

  On the inner peripheral side of the pad 43, a knockout member 44 corresponding to an annular member in the present invention is fitted so as to be movable up and down with a clearance of about 0.02 to 0.05 mm. The knockout member 44 has a cylindrical portion whose inner diameter is slightly smaller than the outer diameter of the flange portion 42, and a bottom plate portion bent toward the inner peripheral side at the lower end portion of the cylindrical portion. Is a spring seat, and a plurality of springs 45 that are pressed upward are arranged on the lower side. That is, the knockout member 44 is urged upward by these springs 45.

  Further, a support member 46 is disposed on the inner peripheral side of the knockout member 44. The support member 46 is a member for supporting the flange portion 42 in cooperation with the knockout member 44, and has a flat plate shape as a whole, and has a cross-sectional shape corresponding to the flange portion 42 at the outer periphery of the upper end thereof. A flange receiving portion 47 that is recessed is formed. The bottom plate portion of the knockout member 44 is engaged with the lower portion on the outer peripheral side of the support member 46, and the knockout member 44 pushed up by the spring 45 engages the bottom plate portion with the support member 46. It has been prevented from coming off. In this state, the upper end surface of the knockout member 44 is substantially flush with the upper surface of the pad 43. The container mounting table 40 including the pad 43, the knockout member 44, the support member 46, and the like has a bolt (not shown) screwed into a screw hole 48 formed in the center portion of the support member 46, and is moved upward from the molding table 2. Can be extracted. Therefore, so-called mold change according to the target container 31 is easy.

  Here, the details of the support member 46 and the knockout member 44 will be further described. As shown in FIG. 4, the inner wall surface of the lower end opening of the container 31 and the outer periphery of the central convex portion of the support member 46 with which the container 31 is fitted. The angle θ1 formed with the surface may be 0 degrees in principle, but it is preferable to give a slight insertion angle (for example, about 3 degrees) in consideration of the positioning effect of the container 31. The flange receiving portion 47 has a concave curved surface corresponding to the shape of the flange portion 42, and the radius of curvature R may be equal to or larger than the radius of curvature r of the flange portion 42 (R ≧ r). In order to improve the detachability of the container 31 from the container and maintain the flange shape, it is preferable that R> r. Further, since the lower end opening of the container 31 rubs against the support member 46, the surface of the support member 46 is preferably subjected to an appropriate curing treatment, such as titanium nitride (TiN) or titanium carbide (TiC). The surface treatment is preferably performed by ion plating.

  The difference between the inner diameter of the cylindrical portion of the knockout member 44 and the outer diameter of the flange portion 42 is about 1.0 to 2.0 mm. Therefore, the hook allowance W for the cylindrical portion (knockout member 44) of the flange portion 42 is zero. .5 to 1.0 mm. Further, in order to ensure the vertical movement of the knockout member 44 relative to the pad 43, the clearance between the two is set to 0.02 to 0.05 mm.

  The inclination angle θ2 on the distal end side (outer peripheral end side) of the flange portion 42 of the container 31 is 0 to 10 degrees. This is to protect the can inner surface resin coating. Therefore, since the inclination angle of the outer peripheral surface of the flange receiving portion 47 is set to the same angle as that of the flange portion 42, the upper end surface of the knockout member 44 that forms the subsequent portion is the outer peripheral end of the flange portion 42. In order to prevent the deformation of the flange receiving portion 47, it is preferable that the inclination angle is the same as that of the outer peripheral end of the flange receiving portion 47. That is, it is set to about 0-10 degrees.

  The knockout member 44 is lowered when the container 31 is pressed by the pressurizing unit 9, and as a result, the container 31 is sandwiched between the pressurizing unit 9. Accordingly, the elastic force of the spring 45 urging the knockout member 44 upward is set to a strength that does not deform the container 31 or its flange portion 42 and is weaker than the pressing force by the pressurizing unit 9. Specifically, it is set to about 10 to 100N.

  Next, the operation of the above-described capping device, that is, the method of the present invention will be described. The container 31 is molded into a predetermined shape in advance, and the cap portion 34 is covered with the mouth portion 34, and is carried onto the molding table 2 in an upright state with the flange portion 42 on the lower side. This is the carrying-in process in the present invention and can be performed by a conventionally known infeed turret or star wheel (not shown). The container 31 is fed between the body guides 5 described above and positioned on the container mounting table 40. This state is shown in FIGS.

  In this state, the flange portion 42 of the container 31 is placed on the upper surface of the knockout member 44 pushed up to the upper end, and the molding head 8 is positioned above the container 31. Then, the molding head 8 and the pressure unit 9 are lowered in accordance with the turning of the molding table 2, and the push pin 10 and the pressing pad 37 sequentially contact the top plate portion of the cap rough shape member 35 to press the container 31. As a result, the knockout member 44 is lowered while compressing the spring 45 disposed on the lower side thereof, and the support member 46 is fitted inside the flange portion 42. In other words, the flange portion 42 descends with respect to the flange receiving portion 47 of the support member 46, and the flange portion 42 abuts on the upper surface of the flange receiving portion 47, where the flange portion 42 is moved by the support member 46 and the knockout member 44. Supported. This is the reduction step in the present invention.

  Thus, the container 31 is sandwiched between the pressing pad 37 and the support member 46, and as a result, the lower limit position of the container 31 is determined. Further, the pressure unit 9 and the molding head 8 are further lowered. As a result, the pressure block 36 pressurizes the outer peripheral corner portion of the rough cap member 35 while the pressing pad 37 is moved backward relative to the pressurizing unit 9, and is drawn into a predetermined shape. This state is shown in FIGS.

  In this state, the screw forming roll 12 is lowered to a position facing the outer peripheral surface of the rough cap member 35, and the skirt fastening roll 13 is lowered to a position corresponding to the skirt skirt portion of the rough cap member 35. Then, when the cone cam 11a is further lowered, the cam follower 16 in contact with the cone cam 11a moves inward in the radial direction, and the open / close arms 32 and 33 are rotated in accordance with this, and screw forming is performed. The roll 12 and the skirt fastening roll 13 move toward the outer peripheral surface of the rough cap member 35. In addition, since the forming head 8 rotates together with this, each roll 12, 13 rolls around the cap rough profile 35, and as a result, the screw forming roll 12 moves against the cap rough profile 35. Screw forming is performed, and the skirt skirt is skirt tightened by the skirt tightening roll 13. This is the screw forming step in the present invention.

  Since the top plate portion of the rough cap member 35 is pressed by the pressurizing unit 9 until the screw forming step is reached, a load is applied to the container 31 to compress it in the axial direction. . On the other hand, since the flange part 42 in the lower end opening part of the container 31 is supported by the flange receiving part 47 having a cross-sectional shape corresponding to the shape, deformation of the flange part 42 is prevented. Further, the flange portion 42 is fitted to the support member 46, so that the container 31 does not shift in the lateral direction even when a so-called lateral load is applied by screw molding or hem fastening. Fastening can be performed as expected. That is, since the support member 46 acts as a substitute for the bottom lid even though the bottom lid is not wound around the opening, it is possible to prevent the opening and the can body from being distorted.

  While the above-described screw forming and skirt fastening forming are completed while the forming table 2 is rotated by a predetermined angle, the rolls 12 and 13 are separated from the cap in the radial direction by the action of the cams described above. As the molding head 8 and the pressure unit 9 are raised, the pressing pad 37 and the push pin 10 are separated from the top plate portion of the cap. As a result, the pressing force acting on the container 31, that is, the pushing-down force toward the molding table 2, does not act, so that the knockout member 44 is raised by the elastic force of the spring 45 disposed below it, The finished container 31 is pushed up to the upper surface of the molding table 2, that is, the feed line. This is the lifting step in the present invention.

  Almost simultaneously with or immediately after the end of the lifting process, the molded container 31 is moved to the carry-out position with the rotation of the molding table 2, and the container 31 is sent to the next process at the carry-out position. This is performed, for example, by an unloading turret or a star wheel (not shown) arranged close to the molding table 2. In that case, the container 31 slides on the upper surface of the molding table 2, but the upper surface of the support member 46 and the upper surface of the knockout member 44 are substantially flush with the upper surface of the molding table 2. It is carried out without being caught or overturned.

  The present invention is not limited to the above-described specific example, and a member that elastically supports the knockout member 44 corresponding to the annular member of the present invention may be an elastic block such as rubber, in addition to the spring 45, or An appropriate elastic actuator such as an air cushion can be used. Further, when deformation such as buckling at the time of capping cannot be prevented due to rationalization of the container material, the pressurized gas may be sent into the container to prevent deformation. Alternatively, the protrusion height of the central convex portion of the support member 46 may be increased by about 10 mm, and the support member 46 may be moved up and down by a lifting device (not shown). In that case, the knockout member 44 is integrated with the pad 43.

It is a fragmentary longitudinal cross-sectional view which shows an example of this invention, Comprising: It is a longitudinal cross-sectional view which shows the state in which the flange part is mounted in the knockout member. It is a fragmentary sectional view which shows the state of the lower end part of the flange part in the state shown in FIG. It is a longitudinal cross-sectional view similar to FIG. 1 which shows the state which the container was pressed and descended with the knockout member. It is a fragmentary sectional view which shows the state of the lower end part of the flange part in the state shown in FIG. It is a fragmentary longitudinal cross-section which shows a part of example of the capping apparatus based on this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Capping apparatus, 2 ... Molding table, 8 ... Molding head, 9 ... Pressing unit, 10 ... Push pin, 12 ... Screw molding roll, 13 ... Hem fastening roll, 31 ... Container, 34 ... Mouth part, 35 ... Cap Coarse shape, 36 ... Pressure block, 37 ... Pressure pad, 39 ... Recess, 40 ... Container mounting table, 41 ... Body, 42 ... Flange, 43 ... Pad, 44 ... Knockout member, 45 ... Spring, 46 ... Support Member, 47 ... flange receiving part.

Claims (4)

A metal cap rough shape is placed on the mouth of a metal container having an opening having a flange formed at the lower end and a mouth formed with a screw at the upper end. In the capping method of performing screw molding of the rough cap material with a screw forming roll in a state in which the top plate portion is pressed toward the mouth by a pressing member,
By bringing the flange portion into contact with a support member having a cross-sectional shape corresponding to the shape of the flange portion, and pressing the top plate portion of the rough cap material with the pressing member, the container is moved with the pressing member. A capping method, wherein the cap rough profile is screw-formed after being sandwiched between the support member and the support member. A metal cap rough shape is placed on the mouth of a metal container having an opening having a flange formed at the lower end and a mouth formed with a screw at the upper end. In the capping method of performing screw molding of the rough cap material with a screw forming roll in a state in which the top plate portion is pressed toward the mouth by a pressing member,
A carrying-in step of carrying the container with the cap over the mouth part between a molding head and a molding table for forming a screw part on the outer peripheral surface of the cap;
Lowering the molding head and pressing the cap top plate portion with the pressing member, the container is lowered from the molding table surface by the pressing force, and the cross-sectional shape corresponding to the shape of the flange portion is the lower end of the container. A reduction step of holding the support member with
A screw forming step of forming a screw portion on the outer peripheral surface of the cap with a forming roll of the forming head;
After screw molding, a lifting step of raising the container to the molding table surface as the molding head rises;
A capping method comprising: an unloading step of unloading the thread-formed container raised to the surface of the forming table to the next step.   The lower surface of the flange portion is supported by an annular member having an elastic force that opposes the pressing force of the pressing member when the container is lowered from the molding table surface. The capping method described. An opening having a flange portion formed at the lower end, a metal cap having a mouth portion having a screw portion formed at the upper end, a metal cap is placed on the molding table, In a capping device that forms a threaded portion on the outer peripheral surface of the cap by rolling the molding roll provided on the molding head around the cap while pressing the top plate portion of the cap toward the molding table by the molding head.
A support member provided on the molding table at a position facing the molding head and having a cross-sectional shape corresponding to the shape of the flange portion;
A capping member that is arranged to be movable up and down in a state of being elastically biased upward on the outer peripheral portion of the support member, and to support the outer peripheral portion of the flange portion elastically. apparatus.

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