JP5101949B2 - BACKUP ROLL USED FOR CORRECTION OF CAN CAN JOIN - Google Patents

Description

  The present invention relates to a backup roll used for correction of a can body joint and a correction device for a can body joint having the same, and in particular, from various cylindrical bodies such as a cylinder and a square tube joined by electric resistance seam welding. The present invention relates to a back-up roll used for correcting a can barrel joint suitable for correcting the joint portion of the can body, and a can barrel joint correcting apparatus including the backup roll.

  In general, when a metal can is manufactured, a bottom member and a lid member are wound and joined to openings at both ends of a cylindrical can or a rectangular tube. In manufacturing this type of can body, a thin metal plate is formed by bending or the like to form a cylindrical body, and the ends of the cylindrical body are butted together and joined. Conventionally, the joining of the cylindrical bodies has been performed with solder or an adhesive, but in recent years, welding has been frequently used for joining the cylindrical bodies in consideration of strength and cost. As this welding, electric resistance seam welding is mainly performed. Such welded joints are susceptible to oxidation under the influence of heat and are dangerous because burrs and the like are generated at the joints. Therefore, paints are applied to the joints or resin films are coated. It was essential to correct it.

  Therefore, for example, Patent Document 1 discloses a correction device that corrects a joint by pressing a correction tape against a joint by electrical resistance seam welding of a cylindrical can body. In this correction device, after heating each joint part of a plurality of can cylinders in order to enhance the adhesion to the correction tape, each can cylinder is sequentially conveyed to the pressure bonding position of the correction tape, and the inside of the can cylinder at the pressure bonding position. The crimping roll is positioned at a position facing the joint in the above from above, and the can body is held from below by a backup roll facing the crimping roll, and then the crimping roll is pressed against the joint via a correction tape. As a result, the correction tape is pressure-bonded to the joint. Then, the can body to which the correction tape is pressure-bonded is conveyed to the downstream side by the rotational drive of the backup roll, and the excess correction tape is cut and removed.

JP 2005-199328 A

  Some can bodies have a coating layer formed on the outer peripheral surface thereof by laminating a film or coating a paint.

  When this type of can body is applied to the correction device described above, the coating layer formed on the outer peripheral surface of the bonded portion is melted or softened (thermoplasticized) by heating the bonded portion before the correction tape is pressed. There are things to do. And, when the coating layer thus melted or softened is pressed against the backup roll via the pressing force of the pressing roll when the correction tape is pressed, the coating layer is deformed by the rigidity of the backup roll, There is a possibility that wrinkles reflecting the shape of the deformed coating layer may occur on the outer peripheral surface of the can body. Alternatively, when the coating layer melted or softened is transferred to the outer peripheral surface of the backup roll due to its viscosity, when the correction tape is pressure-bonded to a subsequent can body to which the correction tape is being pressed, Since the backup roll with the coating layer transferred is pressed against the outer peripheral surface of the subsequent can body, the shape of the coating layer transferred to the backup roll is reflected on the outer peripheral surface of the subsequent can body. There is a risk of the presser foot mark being generated.

  Such wrinkles and presser marks generated on the outer peripheral surface of the can body are, for example, a material that is excellent in elasticity and releasability (in other words, peelability from the coating layer) of the entire backup roll, such as silicone rubber. It may be possible to avoid this by forming the film.

  However, even in this case, for example, when the silicone rubber forming the backup roll is transferred to the pressure roll, for example, when the backup roll contacts the pressure roll, the following problems may occur. .

  That is, when silicone rubber is transferred to the crimping roll, the transferred silicone rubber is transferred to the inner peripheral surface of the can body this time when the correction tape is crimped thereafter. become. And when filling the filling (contents) with a poor compatibility with a liquefied substance in the can formed by the can body by which silicone rubber was transferred to the inner peripheral surface in this way, Due to the high liquid repellency of the transferred silicone rubber, the quality of the filling may be significantly degraded. In particular, when a coating material is filled as a filling material, the silicone rubber is mixed in the coating material, so that the coating property of the coating material is deteriorated, which may cause a phenomenon of so-called coating repelling.

  Therefore, conventionally, there is a problem that it is difficult to surely obtain a can that can maintain the quality of a filling material that has few wrinkles and press marks and is excellent in appearance and poor compatibility with a liquefied substance. It was happening.

  Therefore, the present invention has been made in view of such problems, and it is possible to reliably obtain a can that is excellent in appearance and can maintain the quality of a filling material that is poorly compatible with a lyophobic substance. It is an object of the present invention to provide a backup roll used for correcting a can barrel joint and a can barrel joint correcting apparatus including the backup roll.

  In order to achieve the above-mentioned object, the backup roll used for the correction of the can body joint portion of the present invention is formed in a cylindrical shape or a rectangular tube shape formed by joining the end portions of metal tubular bodies and joining them by seam welding. In addition, with respect to the can body in which a coating layer made of a film or a paint is formed on the outer peripheral surface so as to avoid the joint portion by seam welding, the joint portion is heated and then the inside of the can body When the correction tape is crimped to the joint using a pressure roll, the joint and the periphery thereof are held so as to face the pressure roll from the outside of the can body, and the correction tape In the back-up roll used for correcting the can body joining portion that transports the can body that has been subjected to the pressure bonding toward the position where the subsequent processing of the correction tape is performed, the pressure of the correction tape In this case, the joint portion has an outer peripheral surface that is press-contacted, and by rotating the outer peripheral surface in the circumferential direction, the can body is transported to the joint portion press-contacted to the outer peripheral surface. A metallic inner drive roll that acts on the conveying force and axially both outer positions on the same axis of the inner drive roll, and adjacent to the joint in the axial direction when the correction tape is crimped The peripheral portion of the joining portion has an outer peripheral surface that is press-contacted, and it is possible to follow the conveyance of the peripheral portion press-contacted to the outer peripheral surface and perform a driven rotation coaxial with the inner drive roll. A pair of free rolls made of metal and an axially outer position on the same axis of the pair of free rolls, respectively, are adjacent to the periphery of the joint in the axial direction when the correction tape is crimped. further The can body has an elastic outer peripheral surface with which the peripheral portion is pressed against the outer peripheral portion pressed against the outer peripheral surface by rotating coaxially and integrally with the inner drive roll. It is characterized by comprising a pair of outer drive rolls for applying a transport force for transporting the roller. In this case, it is preferable that the outer peripheral surface of the outer drive roll is formed by fluororubber lining. The outer peripheral surface of the inner drive roll is preferably formed by chrome plating. Furthermore, the outer peripheral surface of the free roll is preferably formed by chrome plating. Furthermore, the outer peripheral surface of the crimping roll is formed in a circular arc shape in which a cross-sectional outline cut along the radial direction of the crimping roll is convex outward toward the radial direction, and the inner drive roll The outer peripheral surface of the entire backup roll consisting of the outer peripheral surface of the pair, the outer peripheral surface of the pair of free rolls, and the outer peripheral surface of the pair of outer drive rolls is an outline of a cross section cut along the radial direction of the inner drive roll Is formed in a concave arc shape toward the outer side in the radial direction, and the radius of curvature of the cross section of the outer peripheral surface of the entire backup roll is slightly larger than the radius of curvature of the cross section of the outer peripheral surface of the press roll. Preferably it is formed.

  In addition, the can barrel joint correcting device of the present invention is formed in a cylindrical or rectangular tube shape having two openings formed by overlapping end portions of metal cylindrical bodies and joining them by seam welding, A can that pressure-bonds a correction tape from the inside of the can body to the joint portion on a can body that has a coating layer made of a film or paint so as to avoid the seam welded joint portion on its outer peripheral surface In the trunk joint correction device, the correction tape is pressure-bonded from the position where the heat treatment of the joint, which is the pre-stage processing of the pressure-bonding of the correction tape, is performed along the direction passing through the opening. An apparatus for transporting the can body, to which the correction tape is pressure-bonded, from a pressure-bonding position of the correction tape to a position where subsequent processing of pressure-bonding of the correction tape is performed, and the correction tape Correction tape A device for supplying the correction tape so as to pass through the opening, and a device for causing the correction tape to face the joint from the inside of the can body at the pressure bonding position of the correction tape; When the can body is transported to the crimping position, the correction tape is placed on the joint after the heat treatment as being positioned inside the can body through the opening. A pressure roll for pressure-bonding the correction tape to the joint, and a pressure-bonding roll disposed from the outside of the can body at the time of pressure-bonding the correction tape. The correction body is held along the direction penetrating the opening while holding the joining portion and its peripheral portion so as to face each other and the pressure-bonding of the correction tape. A backup roll that conveys toward a position where a subsequent process of pressure bonding of the tape is performed, and the backup roll has an outer peripheral surface to which the joint is pressed when the correction tape is pressure-bonded. A metal inner drive roll that applies a transport force for transporting the can body to the joint portion pressed against the outer peripheral surface by rotating the surface in the circumferential direction, and the inner drive roll The outer peripheral surface is disposed at both outer positions in the axial direction on the same axis, and the peripheral portion of the joint adjacent to the joint in the axial direction is pressed against the joint when the correction tape is crimped. A pair of metal free rolls that can be driven to be coaxially driven with the inner drive roll following the conveyance of the peripheral portion pressed against the outer peripheral surface, and the coaxial of the pair of free rolls An elastic outer peripheral surface that is disposed at an outer position in the axial direction on the upper side, and that is further press-contacted with the outer peripheral portion adjacent to the peripheral portion of the joint portion in the axial direction when the correction tape is crimped. A pair of outer drive rolls that apply a transport force for transporting the can body to the outer periphery pressed against the outer peripheral surface by rotating coaxially and integrally with the inner drive roll It is characterized by consisting of. In this case, it is preferable that the outer peripheral surface of the outer drive roll is formed by fluororubber lining. The outer peripheral surface of the inner drive roll is preferably formed by chrome plating. Furthermore, the outer peripheral surface of the free roll is preferably formed by chrome plating. Furthermore, the outer circumferential surface of the crimping roll has a circular arc whose cross-sectional outline cut by the radial cut surface of the crimping roll including the rotation axis of the crimping roll is convex outward in the radial direction. The outer peripheral surface of the entire backup roll formed of the outer peripheral surface of the inner drive roll, the outer peripheral surface of the pair of free rolls, and the outer peripheral surface of the pair of outer drive rolls is The outer contour line of the cross section cut along the outer periphery in the radial direction is formed in a concave arc shape, and the curvature radius of the cross section of the outer peripheral surface of the entire backup roll is the outer peripheral surface of the press roll. It is preferable that it be formed slightly larger than the radius of curvature of the cross section.

  According to the backup roll used for the correction of the can body joint portion of the present invention and the correction device for the can body joint portion provided with the roll, the quality of the filling material which is excellent in appearance and incompatible with the liquid-soluble substance can be obtained. A can that can be maintained can be reliably obtained. Specifically, when the correction tape is pressure-bonded to the joint using a pressure-bonding roll, even if the can body having a coating layer formed of a film or paint on the outer peripheral surface is pressed against the backup roller, Generation of wrinkles and press marks on the outer peripheral surface of the can body can be suppressed. In addition, a backup roll that can suppress the occurrence of such wrinkles and press marks can be realized without using silicone rubber with excellent elasticity and releasability. As a result, mixing of the silicone rubber into the filling in the can can be avoided, and deterioration of the quality of the filling due to the high liquid repellency of the silicone rubber can be avoided. In particular, when a paint (for example, a paint for automobiles) is used as the filler, paint repellency can be reliably suppressed.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a backup roll used for correcting a can barrel joint according to the present invention and a can barrel joint correcting apparatus including the backup roll will be described with reference to FIGS. 1 to 13.

  FIG. 1 shows an outline of one embodiment of a correction apparatus of the present invention, a seam welding apparatus and a reforming apparatus as a pre-processing apparatus for the correction apparatus.

  As shown in FIG. 1 a, these devices are arranged in the order of the seam welding device 100, the reforming device 110, and the correction device 90 in the order of processes. Each of the devices 100, 110, and 90 is an unjoined metal cylindrical body 15a that is formed into a substantially rectangular tube shape (in the present embodiment, a regular rectangular tube shape) by the respective transfer devices 100a, 110a, and 90a. Alternatively, the can body 15 having two openings made of the joined cylindrical body 15a is conveyed at regular intervals, and the can body 15 is formed by electrical resistance seam welding to the tubular body 15a. Correction of the joint portion of the cylinder 15 is performed. The can body 15 may be cylindrical.

  The seam welding apparatus 100 is formed in a conventionally known configuration, and the seam welding apparatus 100 is configured with respect to the overlapping portion of both ends in a state where both ends in the circumferential direction of the cylindrical body 15a are overlapped. A joining process by electrical resistance seam welding (hereinafter abbreviated as seam welding) is performed. The seam welding of the cylindrical body 15a may be performed by overlapping the end of the cylindrical body 15a by 0.3 to 1.2 mm. In the present embodiment, the cylindrical body 15a and the can body 15 are provided with coating layers 150 and 151 made of a resin film or paint on the outer peripheral surface and the inner peripheral surface (see FIG. 11). ). However, the covering layers 150 and 151 are formed so as to avoid the end portion of the cylindrical body 15a, that is, the joint portion 153 of the can body 15 from the viewpoint of appropriately performing seam welding.

  Similar to the seam welding apparatus 100, the reforming apparatus 110 is formed in a conventionally known configuration, and the reforming apparatus 110 has an appropriate corner shape formed by seam welding of the cylindrical body 15a. It is designed to correct into a cylindrical shape.

  The correction device 90 in the present embodiment performs a correction process for correcting the joint using a correction tape on the can body 15 conveyed from the reforming device 110 side, and the corrected can body 15 is subjected to the correction process. It is sent out to an attachment process of a lid member for closing the opening.

  In this embodiment, the conveying device 100a of the seam welding device 100 is formed by a chain conveyor with claws, and the conveying device 90a of the reforming device 110 is formed by a roller conveyor that is nipped and conveyed by a roll. The conveying device 90a is formed by a belt conveyor. In FIG. 1a, for convenience, the transport apparatuses 90a, 100a, and 110a are schematically shown directly below the can body 15 (the same applies to FIGS. 2, 3 and the like). , C, the lowermost part of the can body 15 having a square cross section can be opened, and the belt conveyor can be connected to the outer side of each of the four side walls having a straight cross section in the can body 15. Conveying devices 90 a and 100 a are arranged to convey the can body 15. The same applies to the conveyance of the cylindrical body 15a. In addition, you may make it each nail | claw (not shown) hold | maintain in the predetermined space | interval position on both sides of the cylindrical body 15a or the can body 15 in each conveyance apparatus 90a, 100a, 110a.

  In these apparatuses 90, 100, and 110, the conveyance speed of the can body 15 in the reforming apparatus 110 tends to vary. Therefore, in this embodiment, the conveyance state of the can body 15 in the correction apparatus 90 is changed to the adjacent can body. The distance between 15 (interval) is kept constant and is stably conveyed in order. Specifically, first, as shown in FIG. 1a, first, the rotation speed of the motor 90M that drives the conveying device 90a of the correction device 90 is set to the rotation speed of the motor 100M that drives the conveying device 100a of the seam welding apparatus 100. A control device 120 is provided for controlling to synchronize with the speed. The control device 120 detects the rotation speed of the motor 100M on the seam welding apparatus 100 side by a speed sensor 121 such as a pulse generator, and controls the rotation speed of the motor 90M on the correction apparatus 90 side. Each motor 90M, 100M is easy to control if it is a pulse motor. In particular, in the seam welding apparatus 100, since the conveyance speed may be changed in accordance with the welding processing capability, the conveyance speed in the correction device 90 needs to be varied and synchronized. Second, as shown in FIGS. 2 to 5, in the correction device 90, the can body 15 is transported while being supported from the outside by the transport device 90a. The center unit 130 for transporting the can body 15 while keeping the can body 15 in an appropriate posture, that is, a posture in which the joint portion of the can body 15 is at the lowest position, while being inserted into the can body 15 through the opening of the can body 15. Is provided. Details of the transfer device 90a and the center unit 130 will be described later.

  The correction device 90 will be described in more detail. As shown in FIGS. 2 and 3, the correction device 90 is transported by the transport device 90a while the can body 15 is transported in a direction penetrating the opening with the opening directed in the transport direction. The heating process 20 using the heating device 25 by high-frequency heating or the like, the laminating process 30 for pressing the correction tape 32 to the joined portion of the heated can cylinder 15, and the adjacent can cylinder 15, a correction process consisting of a series of steps such as a tape removal step 60 that removes the excess correction tape 62 that extends over 15 is performed.

  More specifically, first, the conveyance device 90a of the correction device 90 will be described. As shown in FIG. 2, the conveyance device 90a has a single pitch forcing over the entire length of the correction device 90 as a basic configuration. The pitch forced conveyor 10 has a conveyor 10 and is endlessly wound around a driving wheel 11 and a driven wheel 12 disposed at both ends of the correction device 90 in the conveying direction. Further, the pitch forced conveyor 10 has claw mechanisms 13 and 14 for gripping or positioning the can body 15 so that the can body 15 does not shift or drop off. Thus, the interval of the can body 15 in the tape removing process or the like can be kept constant. The claw mechanisms 13 and 14 may be formed integrally with the conveyor 10, or may be configured to be linked to the conveyor 10 as a separate device from the conveyor 10.

  Therefore, since the interval between the adjacent can cylinders 15 in the transport direction can be kept constant by the pitch forcing conveyor 10 and the claw mechanisms 13 and 14, the excess tape is stretched between the adjacent can cylinders 15 and discarded. 62 can be controlled to be equal in length, and the can body 15 can be transported without applying excessive tension to the correction tape 32. In addition, since the interval is always constant, the tape removing process can be performed by reliably inserting a means for removing the excess tape 62 into the interval.

  As shown in FIGS. 3 to 5, the transport device 90 a actually crosses a plurality of predetermined length conveyors 10 a to 10 g having the same configuration as the pitch forcing conveyor 10 as a basic configuration with the joint portion at the bottom. The can body 15 is arranged so as to be opposed to the outer surfaces of the four side walls constituting the square can-shaped can body 15 so as to convey the can body 15. As shown in FIG. 4, these conveyors 10 a to 10 g are arranged symmetrically with respect to the vertical center line of the cross section of the can body 15. At the position facing the lower half of the two lower side walls of the can body 15, the conveyor is formed so that the length in the transport direction extends from the inlet of the correction device 90 to the end of the heating step 20. 10a and a conveyor 10b having a length in the conveying direction extending from the end of the laminating step 30 to the exit of the correction device 90 are arranged (see FIGS. 3 to 5). In addition, a conveyor 10c having a length in the transport direction extending from the inlet to the outlet of the correction device 90 is disposed at a position facing the upper half of the lower two side wall portions of the can body 15 from below. (See FIGS. 4 and 5). Further, at the position facing the lower half of the upper two side wall portions in the can body 15, the length in the conveying direction corresponds to the intermediate portions of the heating step 20 and the laminating step 30 of the correction device 90, respectively. The conveyors 10d and 10e formed in the length or the conveyor 10f formed in such a length that the length in the conveying direction extends from the end portion of the laminating process 30 to the exit of the correction device 90 is arranged (FIG. 3 to FIG. 3). 5). Furthermore, at the position facing the upper half of the upper two side wall portions in the can body 15, the length in the transport direction is the length from the start position of the heating step 20 of the correction device 90 to the outlet of the correction device 90. A conveyor 10g formed on the side is arranged (see FIGS. 4 and 5). The conveyors 10a to 10g are respectively wound around drive wheels 11a to 11g and driven wheels 12a to 12g (illustrated only in FIG. 3 and not shown in FIG. 5). It is driven by a motor 90M on the common correction device 90 side.

  The center unit 130 is actually formed as shown in FIGS. 3 and 6 to 8. That is, the center unit 130 is formed by attaching each component to a central body 131 having a long rectangular tube extending in the longitudinal direction of the correction device 90. A pair of lower support roll groups 132 are provided at both ends of the central body 131 in the transport direction, and a pair of upper support rolls 133 are provided near the inner side in the transport direction with respect to the pair of lower support roll groups 132. The center body 131 is supported in the can body 15 by the lower support roll group 132 and the upper support roll 133 when the correction tape is pressure-bonded to the joint.

  Further, the center body 131 is provided with a laminator roll 134 as a crimping roll for thermocompression bonding the correction tape 32 to the joint portion in the vicinity of the downstream side with respect to the upstream upper support roll 133. On the downstream side of 134, an air bubble removing roll 135 is disposed to remove air bubbles from between the joint portion and the correction tape 32 pressure-bonded to the joint portion in the laminating step 30. More specifically, as shown in FIG. 7, the lower support roll group 132 is attached to the left and right sides of the fixed stay 136 fixed to the lower surface of the center body 131 so that the swing stay 137 can swing about the shaft 137a. Four rolls 138 are rotatably attached to the swinging stay 137 so that the weight of the entire center unit 130 is supported by facing the conveyor 10a via the two lower side walls of the can body 15 described above. Is formed. In addition, a spring 139 that exhibits a damper function is extended between the swinging stay 137 and the fixed stay 136, and the spring 139 causes vibration and shaking of the center unit 130 itself when the can body 15 passes. Is to prevent. On the other hand, as shown in FIG. 8, the upper support roll 133 is attached to the left and right sides of the fixed stay 140 fixed to the lower surface of the center body 131. Opposite to the conveyor roll 141 via the upper two side wall portions, the press contact force at the time of laminating the correction tape 32 is maintained, and the center unit 130 is prevented from rotating in the vertical and horizontal directions. . The conveyor roll 141 is driven by a motor 90M on the correction device 90 side. By the conveyor roll 141, a conveying force is applied to the can body 15, and the can body 15 is stably conveyed. It has become so.

  As shown in FIG. 3, a laminator roll that is disposed at the pressure bonding position of the correction tape 32 in the laminating process 30 and performs a pressure bonding process 40 (see FIG. 2) for thermocompression bonding the correction tape 32 to the joint portion of the can body 15. 134 can be advanced and retracted in the vertical direction in FIG. 3 by a pressure cylinder 142 disposed on the lower surface side of the center body 131. And the backup roll 143 of this invention is arrange | positioned in the position which opposes this laminator roll 134 from the downward direction in FIG.

  Here, FIG. 9 shows a cross-sectional view of the backup roll 143 taken along line 9-9 in FIG. FIG. 10 is a schematic left side view of FIG. Further, FIG. 11 shows a schematic cross-sectional view along line 9-9 in FIG. 3 similar to FIG. 9 together with the can body 15 and the correction tape 32.

  As shown in FIG. 11, the backup roll 143 uses the laminator roll 134 to press the correction tape 32 against the heated joint portion 153 of the can body 15 that has undergone the heating process 20 shown in FIGS. 2 and 3. At this time, the joint portion 153 of the can body 15 and its peripheral portion are held from below as opposed to the laminator roll 134. As shown in FIG. 11, the correction tape 32 is supplied into the can body 15 through the opening of the can body 15 by a known tape feeding mechanism. On the other hand, it faces from the inside of the can body 15. At this crimping position, the correction tape 32 is crimped to the joint 153 and its peripheral part from the inside by a laminator roll 134. The supply of the correction tape 32 will be further described later.

  Returning to FIG. 9, the backup roll 143 has a substantially cylindrical rotary shaft 155 that is long in the horizontal direction in FIG. 9 (the vertical direction in FIG. 3), and the right end of the rotary shaft 155 in FIG. 9. A gear 156 is fixed to the part. A motor 90M on the correction device 90 side shown in FIG. 3 is connected to the gear 156 via another gear 167 (see FIG. 10), and the driving force of the motor 90M is transmitted to the gear 156. The backup roll 143 is driven to rotate. Then, by this rotational drive, the backup roll 143 conveys the can body 15 on which the correction tape 32 has been pressure-bonded toward a position where a later-described bubble removing step 50 (see FIG. 2) is performed. It is supposed to be.

  The backup roll 143 has a frame 160 of the correction device 90 via a holding portion 158 that rotatably holds the rotating shaft 155 via a bearing 157 and a columnar body 159 that is connected to the lower end portion of the holding portion 158. It is fixed on the top.

  Furthermore, in this embodiment, the roll body of the backup roll 143 is divided into five along the rotation shaft 155.

  That is, the backup roll 143 has a metal inner drive roll 161 fixed to the rotary shaft 155, and the correction tape 32 is provided on the outer peripheral surface 161a of the inner drive roll 161 as shown in FIG. When the laminator roll 134 is pressed by the pressurizing cylinder 142, the joint 153 is pressed. In addition, as shown in FIG. 11, the coating layer 150, 151 which consists of a film or a coating material is not formed in the junction part 153 in the outer peripheral surface and inner peripheral surface. Then, the inner drive roll 161 can rotate with respect to the joint portion 153 by rotating around the rotation shaft 155 via the driving force of the motor 90M in a state where the joint portion 153 is pressed against the outer peripheral surface 161a. A conveying force for conveying the body 15 is applied.

  A pair of metal free rolls 162 and 163 are rotatably attached to the rotary shaft 155 via bearings 162b and 163b, respectively, at both axial positions on the inner drive roll 161 (left and right in FIG. 9). It has been. As shown in FIG. 11, the outer peripheral surfaces 162 a and 163 a of the pair of free rolls 162 and 163 are joined together with the laminator roll 134 pressed by the pressure cylinder 142 when the correction tape 32 is pressed. Peripheral portions (hereinafter referred to as inner peripheral portions) of a pair of joint portions 153 adjacent to the portion 153 on both outer sides in the axial direction (left and right in FIG. 11) are respectively pressed. The free rolls 162 and 163 are driven to be driven coaxially with the inner drive roll 161 by following the conveyance of the inner peripheral portions pressed against the outer peripheral surfaces 162a and 163a.

  Further, a pair of outer drive rolls 164 and 165 that are coaxial with the free rolls 162 and 163 are respectively fixed at both axial positions (left and right in FIG. 9) with respect to the pair of free rolls 162 and 163 on the rotating shaft 155. It is installed. Most of the pair of outer drive rolls 164 and 165 are made of metal, but the outer peripheral edge portions 164b and 165b are formed flexibly by an elastic body. As shown in FIG. 11, the outer peripheral surfaces 164a and 165a of the pair of outer drive rolls 164 and 165, that is, the outer peripheral surfaces 164a and 165a of the outer peripheral edge portions 164b and 165b, Along with the press contact of the laminator roll 134 by the pressure cylinder 142, the outer peripheral portion (hereinafter referred to as the outer peripheral portion) further outside the inner peripheral portion adjacent to the inner peripheral portion on both outer sides in the axial direction (left and right in FIG. 11). ) Are pressed against each other. And the outer side drive rolls 164 and 165 are coaxial with the inner side drive roll 161 centering on the rotating shaft 155 via the drive force of the motor 90M in the state which the outer peripheral part was press-contacted to each outer peripheral surface 164a and 165a. By performing the rotation, a conveying force for conveying the can body 15 is applied to the outer peripheral portion.

  Furthermore, the outer peripheral surface of the entire backup roll 143 including the outer peripheral surface 161a of the inner drive roll 161, the outer peripheral surfaces 162a and 163a of the free rolls 162 and 163, and the outer peripheral surfaces 164a and 165a of the outer drive rolls 164 and 165 is shown in FIG. A cross-sectional outline, that is, a cross-sectional outline cut along the radial direction of the inner drive roll 161 (hereinafter referred to as a radial cross-sectional outline) is formed in a concave arc shape toward the outside in the radial direction. ing. As shown in FIG. 11, the outer peripheral surface of the laminator roll 134 has a cross-sectional outline in FIG. 11, that is, a cross-sectional outline cut along the radial direction of the laminator roll 134 (hereinafter referred to as a radial cross-sectional outline). Is formed in a convex circular arc shape toward the outside in the radial direction.

  And according to the backup roll 143 divided | segmented into five rolls 161, 162, 163, 164, 165 in this way, even if the coating layer 150 formed in the outer peripheral surface of the can body 15 is by the heat in the heating process 20 Even if it has been softened, the coating layer 150 is not originally formed on the outer peripheral surface of the joint portion 135, so the inner drive roll 161 with which the joint portion 135 is in pressure contact does not adversely affect the coating layer 150 at all. A sufficient conveying force can be applied to the barrel 15. On the other hand, as shown in FIG. 11, a coating layer 150 is formed on the inner periphery that is in pressure contact with the pair of free rolls 162 and 163. However, since the free rolls 162 and 163 do not rotate spontaneously but rotate following the conveyance of the can body 15, the free rolls 162 and 163 are large in the conveyance direction with respect to the coating layer 150 softened by the heating process 20. A force is not applied, and the large deformation of the coating layer 150 can be suppressed. Moreover, since such free rolls 162 and 163 are easily peeled off from the coating layer 150, the transfer of the coating layer 150 to the outer peripheral surfaces of the free rolls 162 and 163, that is, the pressure bonding of the correction tape 32 is currently performed. The cause of pressing marks on the outer peripheral surface of the succeeding can body 15 with respect to the can body 15 can be suppressed. Furthermore, as shown in FIG. 11, a coating layer 150 is also formed on the outer peripheral portion that is in pressure contact with the pair of outer drive rolls 164 and 165. However, since the outer peripheral surfaces 164a and 165a of the outer driving rolls 164 and 165 have elasticity, a large force in the transport direction is not applied to the coating layer 150, and the coating layer 150 is greatly deformed. Can be prevented. Further, if the can body 15 is heated mainly (locally) to the joint portion 135 in the heating step 20, the outer peripheral portion can be maintained at a relatively low temperature. Softening of the coating layer 150 formed on the outer drive rolls 164 and 165 can be suppressed, and in other words, the cause of the press marks can be suppressed.

  Therefore, according to the present embodiment, when the correction tape 32 is pressure-bonded to the joint portion 153 by the backup roll 143 divided into the five rolls 161, 162, 163, 164, 165, the covering layer of the can body 15 It is possible to suppress the occurrence of wrinkles and press marks that impair the appearance of the can body 15 in 150.

  Further, if the backup roll 143 having such a divided structure is used, it is not necessary to use silicone rubber in order to ensure elasticity and releasability, so that the can formed using the can body 15 is filled. It can be avoided in advance that the quality of the filler is deteriorated due to the high liquid repellency of the silicone rubber. In particular, when a paint is used as the filler, so-called paint repellency can be prevented and coating can be performed appropriately.

  More preferably, the outer peripheral edge portions 164b and 165b of the outer drive rolls 164 and 165 are formed by a fluororubber lining. By doing so, the liquid-repellent property can be suppressed as compared with the silicone rubber, so that the quality of the filler can be maintained more effectively.

  More preferably, at least the outer peripheral surface of the inner drive roll 161 is formed by chrome plating. By doing so, the wear of the inner drive roll 161 due to the pressure contact of the joint portion 153 can be suppressed, and the product life can be improved.

  More preferably, at least the outer peripheral surfaces of the free rolls 162 and 163 are formed by chrome plating. By doing so, the releasability of the free rolls 162 and 163 with respect to the coating layer 150 formed in the inner peripheral portion can be further ensured. For this reason, the transfer of the coating layer 150 to the outer peripheral surfaces of the free rolls 162 and 163 can be further reliably suppressed, and the outer periphery of the succeeding can body 15 with respect to the can body 15 to which the correction tape 32 is currently crimped. Generation of press marks on the surface can be further effectively suppressed.

  Further preferably, the radius of curvature (R in FIG. 11) of the outer circumferential surface of the entire outer peripheral surface of the backup roll 143 formed in an arc shape as described above is set to the radius of the laminator roll 134 formed in an arc shape. It is formed slightly larger than the radius of curvature (r in FIG. 11) of the radial cross-sectional outline of the outer peripheral surface. By doing so, it is possible to prevent the can body 15 from being deformed due to the radius of curvature of the radial cross-sectional outline of the outer peripheral surface of the backup roll 143 being too large. It is possible to prevent the backup roll 143 from being damaged by the curvature radius of the line being too small. More preferably, it is desirable that the radius of curvature of the outer circumferential surface of the backup roll 143 on the outer circumferential surface is about 4 mm larger than the radius of curvature of the outer circumferential surface of the laminator roll 134.

  Returning to FIG. 3, similarly to the laminator roll 134, the air bubble removing roll 135 is also disposed on the lower surface side of the center body 131 so as to be able to advance and retract in the vertical direction toward the backup roll 145 facing the pressure cylinder 144. . Both backup rolls 143 and 145 are both driven by a motor 90M on the correction device 90 side.

  Next, the heating step 20 will be described in more detail. In the heating step 20, the can body 15 conveyed by the conveying device 90a is heated from below by the high-frequency heating device 25. At this time, the can body 15 is heated to near the melting temperature of the resin forming the correction tape 32 for thermocompression bonding of the correction tape 32 in the next laminating step 30. In this case, it is desirable that the heating range is the bonding portion and its periphery from the viewpoint of suppressing the transfer of the coating layer 150 formed on the outer peripheral portion to the outer drive rolls 164 and 165 described above.

  Next, as shown in FIG. 12, the correction tape 32 is fed from a feed position (not shown) by a known feeding mechanism, and then in the seam welding process 100 provided in the previous stage of the correction device 90, the cross section Z After entering the inside of the cylindrical body 15a through the opening 102 provided in the letter-shaped (generally referred to as Z-bar) welding mechanism 101, the cylindrical body 15a extends along the conveying direction of the cylindrical body 15a. The inside of the can body 15 enters the inside of the can body 15 which is conveyed further downstream than this through the opening of the can body 15. Then, the correction tape 32 that has entered the inside of the can body 15 proceeds toward the crimping position side along the conveyance direction of the can body 15, and is then supplied to the crimping position via the tape guide 33, as described above. In addition, it is used for pressure bonding by a laminator roll 134. The correction tape 32 may be wound and accommodated in a roll shape at the start position of the feeding.

  Next, the seam welding process 100 will be described in more detail. First, in the seam welding process 100, the cylindrical body 15a in which the end portion is not yet seam welded is formed at the inlet end portion (see FIG. 12a) of the Z bar 101. The left ends are supplied so that both ends are aligned with the grooves of the Z bar 101 (see FIG. 12b). Next, when the cylindrical body 15a is transported in the longitudinal direction of the Z bar 101 and unloaded from the outlet end (the right end in FIG. 12a), both ends are overlapped to enable seam welding. (See FIG. 12c). Thereafter, the cylindrical body 15 a is formed in the can body 15 by seam welding the overlapping portion of the end portion at the welded portion 104. The can body 15 is transported to the next correction step 90 after the can shape is corrected in the reforming step 110. The supply of the correction tape 32 can be handled by providing a tape coil (not shown) disposed on the inner surface through which the can body 15 passes.

  By the way, in the lamination process 30, since the correction tape 32 is supplied as a continuous tape, an unnecessary correction tape 62 remains between the can bodies 15 adjacent in the transport direction after the lamination process 30 or the pressure bonding process 40. It becomes. Therefore, in the next tape discharge processing step 60, the excess correction tape 62 remaining between the can bodies 15 is removed. The tape discharge processing step 60 is formed by a tape separation step having a tape separation mechanism and a tape discharge step having a tape discharge mechanism. As shown in FIG. 2, the tape separation mechanism is formed by a clamp mechanism 70 having a tape holding portion that holds the correction tape 62 and a clamp moving mechanism 80 that pulls the correction tape 62 outward from the can body. More specifically, as shown in FIG. 13, the clamp mechanism 70 includes a lower presser 71 and an upper presser 72. These lower presser 71 and upper presser 72 first clamp the excess correction tape 62 between adjacent can bodies 15 as shown in FIGS. 13a and 13b, and then as shown in FIGS. 13c and 13d. The excess correction tape 62 is mechanically separated by tearing the correction tape 62 that has been clamped by parallel translation (may be rotated) downward. The clamp mechanism 70 can be achieved by using an air cylinder device such as an air chuck. The clamp moving mechanism 70 can be achieved by causing the clamp mechanism 70 to perform a linear reciprocating motion or a rotational reciprocating motion within a predetermined angle range by an air cylinder or an actuator. Further, as shown in FIG. 3, the residual tape 62 separated by the clamp mechanism 70 is discharged by a tape discharge mechanism such as a collecting device including a suction duct 77 provided at the lower portion of the device. . As the collecting device, a belt conveyor, a vacuum device, or the like can be used for collecting the separated or conveyed separation tape. For example, when a surplus tape 62 does not adhere to the tape holding portion of the clamping device 70 and cannot be separated, forcible means such as a vacuum device can be used.

  In the present embodiment, the inner drive roll 161 shown in FIG. 9 has a diameter of 170 mm, the lateral dimension of the outer peripheral surface 161a in FIG. 9 is 10 mm, and the right end of the free roll 162 on the right side in FIG. The dimension from the right end of the right outer drive roll 164 in FIG. 9 to the left end of the left outer drive roll 165 in FIG. 9 was 45 mm. In this embodiment, the radius of curvature R of the outer circumferential surface of the backup roll 143 in the radial direction is 30 mm, and the radius of curvature r of the outer circumferential surface of the laminator roll 134 is 26 mm. Further, in this embodiment, the inner drive roll 161 is made of steel with chrome plating, and similarly, the free rolls 162 and 163 are made of steel with chrome plating. Furthermore, in this embodiment, the outer peripheral edge portions 164b and 165b of the outer drive rolls 164 and 165 are made of fluoro rubber, and the portions other than the outer peripheral edge portions 164b and 165b are made of steel.

  By manufacturing the can body 15 in which the joint portion 153 is corrected using the backup roll 143 of this embodiment, the can having a good appearance with few wrinkles and press marks on the coating layer 150 around the joint portion 153 Could get. More specifically, to obtain a can whose appearance is far superior to the case where the entire backup roll is made of chrome-plated steel, fluororubber lining, or Teflon (registered trademark) resin. I was able to. Moreover, the coating material filled in such a can was able to exhibit excellent paintability.

  In the backup roll used for the correction of the can body joint portion of the present invention and the correction device for the can body joint portion provided with the same, the backup roll divided into five of an inner drive roll, a pair of free rolls and a pair of outer drive rolls By using a roll, it is possible to obtain a can having an excellent appearance, which can improve the yield and maintain the quality of the filling.

(A) is a schematic sectional drawing which shows the whole welding can manufacturing apparatus using one Embodiment of the correction | amendment apparatus of the welding can seam welding part of this invention, (b) is the cross section along the 1b-1b line of (a). Figure, (c) is a cross-sectional view taken along line 1c-1c in (a) 1 is a schematic cross-sectional view showing an embodiment of a correction device for a weld can seam weld according to the present invention. Sectional drawing which shows one Embodiment of the correction apparatus of the welding can seam weld part of this invention in detail (A) is a cross-sectional view taken along line 4a-4a in FIG. 3, (b) is a cross-sectional view taken along lines 4b-4b and 4f-4f in FIG. 3, and (c) is 4c-4c and 4e in FIG. 4D is a cross-sectional view taken along line 4e, and FIG. 4D is a cross-sectional view taken along line 4d-4d in FIG. Development view developed in the cross-sectional direction of the can body showing the arrangement of the conveyor of the transport device 1 shows an embodiment of a center unit, (a) is a schematic side view, (b) is a cross-sectional view taken along line 6b-6b in (a), and (c) is taken along line 6c-6c in (a). Cross section Partial perspective view showing the lower support roll group of the center unit Partial perspective view seen from below showing the upper support roll of the center unit Sectional drawing along line 9-9 in FIG. 3 in the embodiment of the backup roll of the present invention. Schematic left side view of FIG. The figure which shows schematic sectional drawing in alignment with line 9-9 in FIG. 3 of a backup roll with a can body and a correction tape. The process of seam welding the can body is shown, (a) is a schematic side view, (b) is a sectional view taken along line 12b-12b in (a), and (c) is taken along line 12c-12c in (a). Cross section 1 shows an embodiment of a clamp mechanism for cutting off an excess correction tape, (a) and (b) are a sectional view and a side view showing a state before the correction tape is clamped, and (c) and (d) are states where the correction tape is cut off. Sectional view and side view showing

Explanation of symbols

90 Correction device 134 Laminator roll 143 Backup roll 161 Inner drive roll 162, 163 Free roll 164, 165 Outer drive roll

Claims (10)

It is formed into a cylindrical or rectangular tube shape formed by joining the end portions of a metal cylindrical body by seam welding, and from the film or paint so as to avoid the seam welding joint portion on its outer peripheral surface. When the correction tape is pressure-bonded to the joint using a pressure roll from the inside of the can body after the joint portion is heated with respect to the can body formed with the coating layer, the can body The joining portion and its peripheral portion are held so as to face the pressure-bonding roll from the outside, and the can body, to which the correction tape has been pressure-bonded, is subjected to processing subsequent to the pressure-bonding of the correction tape. In the backup roll used for the correction of the can barrel joint transported toward the position,
The can body has an outer peripheral surface to which the joint is pressed when the correction tape is crimped, and the outer periphery is rotated in the circumferential direction so that the can body is pressed against the joint pressed against the outer peripheral surface. A metal inner drive roll that exerts a conveying force for conveying
An outer peripheral surface that is disposed at both axially outer positions on the same axis of the inner drive roll and presses the periphery of the joint adjacent to the joint in the axial direction when the correction tape is crimped. A pair of metal free rolls that can be driven coaxially with the inner drive roll by following the conveyance of the peripheral part pressed against the outer peripheral surface,
The pair of free rolls are disposed at the axially outer positions on the same axis, respectively, and the outer peripheral portion adjacent to the peripheral portion of the joint portion in the axial direction is pressed into contact with the peripheral portion of the joint when the correction tape is crimped. By having an elastic outer peripheral surface and rotating coaxially and integrally with the inner drive roll, a conveying force for conveying the can body to the outer peripheral portion pressed against the outer peripheral surface is provided. A backup roll used for correcting a can barrel joint, comprising: a pair of outer drive rolls that act.   The backup roll used for correction of a can body joint part according to claim 1, wherein the outer peripheral surface of the outer drive roll is formed by fluorine rubber lining.   The backup roll used for the correction of the can body joint part according to claim 1 or 2, wherein the outer peripheral surface of the inner drive roll is formed by chrome plating.   The backup roll used for correction of a can body junction part according to any one of claims 1 to 3, wherein an outer peripheral surface of the free roll is formed by chrome plating. The outer circumferential surface of the crimping roll is formed in an outer shape of a cross section cut along the radial direction of the crimping roll, and is formed in a convex circular arc shape toward the outside in the radial direction,
The outer peripheral surface of the entire backup roll consisting of the outer peripheral surface of the inner drive roll, the outer peripheral surface of the pair of free rolls, and the outer peripheral surface of the pair of outer drive rolls was cut along the radial direction of the inner drive roll. The outline of the cross section is formed in a concave arc shape toward the outside in the radial direction,
The radius of curvature of the cross section of the outer peripheral surface of the entire backup roll is formed slightly larger than the radius of curvature of the cross section of the outer peripheral surface of the press roll. The backup roll used for correction | amendment of the can trunk | joint part as described in a term. It is formed in the shape of a cylinder or a square tube having two openings formed by overlapping the ends of a metal tubular body and joined by seam welding, and avoids the joint by seam welding on the outer peripheral surface thereof. In the correction device of the can body joint portion for performing pressure bonding of the correction tape to the joint portion from the inside of the can body to the can body formed with a coating layer made of a film or paint,
The can body is transported from a position where the heat treatment of the joining portion, which is a pre-process of pressure bonding of the correction tape, along a direction penetrating the opening to the pressure bonding position of the correction tape. An apparatus for transporting the can body, to which the tape is pressure-bonded, from a pressure-bonding position of the correction tape to a position where a subsequent process of pressure-bonding of the correction tape is performed;
An apparatus for supplying the correction tape to the correction tape pressure-bonding position so as to pass through the opening, and causing the correction tape to face the joint from the inside of the can body at the correction tape pressure-bonding position. When,
When the can body is disposed at the pressure bonding position of the correction tape and is transported to the pressure bonding position, the state is located on the inner side of the can body through the opening. A pressure-bonding roll for pressure-bonding the correction tape to the joint by press-contacting via the correction tape;
The correction tape is disposed at the pressure-bonding position of the correction tape, and when the correction tape is pressure-bonded, the bonding portion and its peripheral portion are held from the outside of the can body so as to face the pressure-bonding roll, and the correction is performed. A backup roll that conveys the can body on which the tape has been pressure-bonded to a position where a subsequent process of pressure-bonding of the correction tape is performed along a direction passing through the opening;
The backup roll is
The can body has an outer peripheral surface to which the joint is pressed when the correction tape is crimped, and the outer periphery is rotated in the circumferential direction so that the can body is pressed against the joint pressed against the outer peripheral surface. A metal inner drive roll that exerts a conveying force for conveying
An outer peripheral surface that is disposed at both axially outer positions on the same axis of the inner drive roll and presses the periphery of the joint adjacent to the joint in the axial direction when the correction tape is crimped. A pair of metal free rolls that can be driven coaxially with the inner drive roll by following the conveyance of the peripheral part pressed against the outer peripheral surface,
The pair of free rolls are disposed at the axially outer positions on the same axis, respectively, and the outer peripheral portion adjacent to the peripheral portion of the joint portion in the axial direction is pressed into contact with the peripheral portion of the joint when the correction tape is crimped. By having an elastic outer peripheral surface and rotating coaxially and integrally with the inner drive roll, a conveying force for conveying the can body to the outer peripheral portion pressed against the outer peripheral surface is provided. A correction device for a can barrel joint, comprising: a pair of outer drive rolls that act.   The can body joint correction device according to claim 6, wherein an outer peripheral surface of the outer drive roll is formed of a fluororubber lining.   The can body joint correction device according to claim 6 or 7, wherein an outer peripheral surface of the inner drive roll is formed by chrome plating.   The can body joint correction apparatus according to any one of claims 6 to 8, wherein an outer peripheral surface of the free roll is formed by chrome plating. The outer circumferential surface of the crimping roll is formed in an outer shape of a cross section cut along the radial direction of the crimping roll, and is formed in a convex circular arc shape toward the outside in the radial direction,
The outer peripheral surface of the entire backup roll consisting of the outer peripheral surface of the inner drive roll, the outer peripheral surface of the pair of free rolls, and the outer peripheral surface of the pair of outer drive rolls was cut along the radial direction of the inner drive roll. The outline of the cross section is formed in a concave arc shape toward the outside in the radial direction,
The radius of curvature of the cross section of the outer peripheral surface of the entire backup roll is formed to be slightly larger than the radius of curvature of the cross section of the outer peripheral surface of the pressure-bonding roll. The correction apparatus of the can trunk | joint part of description.

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