JP5385021B2 - Can making system - Google Patents

Description

The present invention relates to a can-making system for producing a pail with a handle continuously from an original metal plate or a processed product thereof by an automatic line.

  In a can-making system using an automatic line, a workpiece is positioned during various types of processing in the middle of the line. In some cases, a specific part of the workpiece needs to be detected as a positioning reference. For example, in the automatic production line of pail can bodies, sheet feeder (original plate supply) → slitter (divided into can sizes) → cylindrical forming → seam welding → clear coating (rust prevention on the outer surface side of seam welds) ) → Expander (tapered) → Curl beader (curl and bead formation on the upper edge) → Flanger (flange formed on the lower edge) → Ground plate seamer → Ear welder → Lot application → Dry tester (leakage test) → Inner seam blowing Processing is performed in the order of attachment → velmatic (attachment of handle). However, in the ear welder, the handle mounting ears (ears) are welded to the upper position of the seam welded part and the radial facing position. Normally, the feed posture of the workpiece (cylindrical can body part) is the same as during seam welding. Since the horizontal direction of the workpiece is changed to the inverted state after the expander, and the direction of the rotation direction of the workpiece varies variously during each intermediate processing, the seam before each of the workpieces enters the ear welder. It is necessary to adjust the orientation so that the position of the welded portion comes to the weld position of the ear portion.

  Conventionally, the orientation of the workpiece before the ear welder is adjusted by the operator visually checking the seam welded part and manually correcting the workpiece orientation, or by touching the thickness change or level difference occurring in the seam welded part. In general, a method of detecting by the above contact method and mechanically rotating the workpiece based on the detected position to obtain a desired orientation has been adopted. As another method, the position of the seam welded portion is detected by a change in the reflected magnetic field when a low-frequency magnetic field is applied to the workpiece, and the workpiece is mechanically rotated based on the detected position to have a desired orientation. This has also been proposed (Patent Document 1).

Japanese Patent Laid-Open No. 9-300080

However, in the conventional work orientation adjustment by the worker, in addition to poor efficiency by manual work, variations in the orientation are unavoidable, and the handle mounting accuracy is poor. In addition, the conventional means for detecting a seam weld by the contact method is liable to cause scratches on the workpiece surface due to the contact, and there is a concern that can quality and yield may be reduced, and false detection or non-detection due to vibration or the like occurs. There was a problem that the reliability of detection was inferior. On the other hand, the detection means according to a change in the reflection field of the proposed magnetic transmission mechanism, reflecting the magnetic field receiving mechanism, with equipment costs for the detection device incorporating the signal processing mechanism or the like is very expensive, work at the detector Since the reflected magnetic field is likely to be disturbed due to the position shift of the position and electromagnetic noise from peripheral devices, there is a problem that the detection accuracy of the seam weld is inferior.

In view of the above-described circumstances, the present invention can easily set a positioning reference for welding handle mounting ears by an automatic method with a small equipment cost burden in a can manufacturing system for a pail can with a handle by an automatic line. Another object of the present invention is to provide a means that can accurately and easily detect the positioning reference without contact.

If the means for achieving the above object is shown with reference numerals in the drawings, the can-making system according to the invention of claim 1 is a cylindrical forming step from at least the upstream side of the line from a metal original plate or a processed product thereof. In an automatic line that manufactures a pail can PC by a continuous process including a seam welding process, a ground plate seamer process, an ear welder process, and a velmatic process,
A reference mark application step is added next to the seam welding step, and a rotational position adjustment step is provided before the ear welder step.
After forming the cylindrical can body 11 by seam welding the both ends of the strip bent in a circular shape in the cylindrical forming step in the seam welding step,
In the reference mark coat-step, in a predetermined position of the top of the can body portion 11 which the seam weld s conveyed sideways as the bottom, by injecting fluorescent ink substantially colorless and transparent by the ink jet printer 5 reference Apply the mark m,
After fixing the base plate 12 to the lower end of the can body portion 11 in the inverted state in the base plate seamer process,
Lifting the can body 1 that is transported in an inverted state in the rotational position adjustment step from the transport path,
As a primary adjustment, the can body 1 in a lifted state is rotated to one side in the circumferential direction, and the reference mark m that emits fluorescence by projecting ultraviolet rays from a fixed position onto the peripheral surface of the can body is detected. The orientation of the can body 1 is set so that the reference mark m is positioned in front of the rotation direction of the ultraviolet irradiation position in the next secondary adjustment by continuing the rotation by a specified angle from the orientation and stopping.
Subsequently, as the secondary adjustment, the can body 1 is rotated at a lower speed than the primary adjustment, and the reference mark m that is fluorescently emitted by projecting ultraviolet rays from a fixed position on the peripheral surface of the can body 1 is detected. The can body 1 is precisely set to the orientation of the processing posture in the next ear welder process by continuing to rotate by a specified angle from the direction of detection and stopping.
In the ear welder process, the handle mounting ear 13 is welded to the upper position of the seam welded portion s of the can body 11 of the can body 1 carried in the set direction and the radially opposed position thereof, A handle 14 is attached to the handle mounting ear 13 in the velmatic process.

The invention according to claim 2 is the can making system according to claim 1 or 2, wherein as the primary adjustment in the rotational position adjustment step, ultraviolet rays are projected from two different locations in the circumferential direction on the rotating can body 1 . Thus, the can body 1 is continuously rotated by a predetermined angle from the direction of the can body 1 where the reference mark m is previously detected, and is stopped.

According to a third aspect of the present invention, in the can making system according to the first or second aspect, in the primary adjustment of the rotational position adjustment step, the detected reference mark m is positioned at the radial rear end position along the conveying direction O. The main body 1 is stopped, and then the can main body 1 is rotated approximately 1/4 in the secondary adjustment.

The invention according to claim 4 is the can making system according to any one of claims 1 to 3, wherein the rotational position adjustment step includes a primary adjustment unit P1 that performs the primary adjustment and a secondary adjustment unit that performs the secondary adjustment. P2 and moving the can body 1 after the primary adjustment to the secondary adjustment portion P2.

Next, effects of the present invention will be described with reference numerals in the drawings. First, according to the can manufacturing system according to the first aspect of the present invention, in the fiducial mark application process next to the seam welding process , the can body part 11 conveyed sideways with the seam welded part s as the lowermost part. The reference mark m is applied by jetting a substantially colorless and transparent fluorescent ink by a jet printer 5 to a predetermined position on the top, and the can body 1 is irradiated with ultraviolet light in the rotational position adjustment process before the ear welder process. The reference mark m is emitted, detected by the fluorescent sensors 7A to 7C, and positioned by the detected reference mark m, and the handle mounting ear 13 is welded in the next ear welder process. In this case, since the detection of the reference mark m can be performed without contact, there is no fear of scratching the surface of the can, and the fluorescent color is detected by the fluorescent sensors 7A to 7C. In addition to being able to catch, even if various colored coatings are applied to the surface of the can body 11, the detection accuracy is not affected, and the reference mark m is applied by the ink jet printer 5, so that the reference is applied to the surface of the can. The mark m can be accurately and reliably expressed with a small size, and the position accuracy of detection can be improved. In addition, there is an advantage that the equipment cost burden can be reduced because a wide range of commercially available products can be used as fluorescent sensors and ultraviolet irradiation means without the need for separate dedicated specifications. Further, since the fluorescent ink is substantially colorless and transparent, the reference mark m is substantially invisible to the naked eye, and there is no concern that the design and appearance of the can may be impaired due to the presence of the reference mark m.

In addition, in the rotational position adjustment step, the can body 1 conveyed in an upright state is lifted from the conveyance path, and the position adjustment by the rotation of the can body 1 is performed in two stages of primary adjustment and secondary adjustment. High position accuracy is ensured. That is, in the primary adjustment, the can body 1 in the lifted state is rotated to one side in the circumferential direction, and the reference mark m that emits fluorescence is detected by projecting ultraviolet rays from a fixed position onto the peripheral surface of the can body. The rotation of the can body 1 is set so that the reference mark m is positioned in front of the rotation direction of the ultraviolet irradiation position in the next secondary adjustment by continuing the rotation by a specified angle from the direction of time and stopping. As the next adjustment, the can body 1 is rotated at a lower speed than the primary adjustment, and the reference mark m that is emitted by irradiating ultraviolet rays from a fixed position onto the peripheral surface of the can body 1 to detect the fluorescence is emitted. The can body 1 is precisely set to the orientation of the processing posture in the next ear welder process by continuing the rotation by a predetermined angle and stopping.

According to the invention of claim 2, as a primary adjustment in the rotational position adjustment step, the can which has previously detected the reference mark m by projecting ultraviolet rays from two different places in the circumferential direction to the rotating can body 1 Since the can body 1 is continuously rotated by a predetermined angle from the direction of the main body 1 and stopped, the amount of rotation of the can body 1 required to detect the reference mark m can be reduced, and the rotation position adjustment time can be shortened accordingly. Thus, the production efficiency of the automatic line can be increased.

According to the invention of claim 3, in the primary adjustment of the rotational position adjustment step, the can main body 1 is stopped so that the detected reference mark m comes to the radial rear end position along the transport direction O, and then in the secondary adjustment. Since the can body 1 is rotated approximately ¼, higher positional accuracy and manufacturing efficiency can be secured.

According to invention of Claim 4, in the rotation position adjustment process, since the can main body 1 which was primarily adjusted by the primary adjustment portion P1 is moved to the secondary adjustment portion P2, when primary adjustment and secondary adjustment are performed at the same position, Compared with this, the production efficiency of the automatic line is improved.

It is a perspective view which shows an example of the pail can to which the can making system of this invention is applied. It is a flowchart of the can making system which concerns on one Embodiment of this invention. It is a schematic side view which shows the reference mark application process in the embodiment. The application | coating situation in the same fiducial mark application | coating process is shown, (a) is a perspective view, (b) is a vertical front view. It is a schematic plan view which shows the rotation position adjustment process of the can main body in the embodiment. The rotation operation of the can main body in the same position adjustment is shown, (a) is a transverse plan view, (b) is a longitudinal side view.

In the pail can PC shown in FIG. 1, a steel can body 1 is composed of a substantially cylindrical can body portion 11 and a disk-shaped base plate 12 constituting a can bottom. Steel crown-shaped handle mounting ears 13 are welded to both sides in the direction, and an arc-shaped handle 14 made of a thick wire is attached to both ends so as to be rotatable up and down via both ear portions 13, 13. In addition, a lug top plate 2A is detachably fitted to the upper end opening of the can body 1 through a peripheral lug 21-. The can body 11 of the can body 1 is formed by bending a metal flat plate into a circular shape and performing seam welding. One ear portion 13 is located on the seam welded portion s and outward on the upper side. It has two upper and lower annular beads 11a, 11b that bulge, and the lower part of the lower bead 11b is slightly tapered downward as a taper pail can.

FIG. 2 shows a flowchart of an automatic line for manufacturing the can body 1, and the contents of each process are as follows.
Sheet feeder: A substantially square original plate (steel plate) is supplied to the conveyance line.
Slitter: Cut the original plate in half to make two strips.
Cylindrical forming ... Each strip is bent into a circle.
Seam welding ··· Weld both ends of the bent strip to make a cylindrical can body.
Clear coating: Apply rust prevention coating on the outer surface of the seam weld.
Expander: Expands the inner diameter of the can body to form a pail can.
Curl beader: curls the outer edge of the upper edge outward and forms a bead.
Flanger: An outward flange is formed around the lower edge.
Base plate seamer: A base plate manufactured in a separate line is fixed to the lower end of the can body.
Ear welder: Weld the handle mounting ears on both sides of the can body in the radial direction.
Lot marking ················································· Display the display item including the lot number.
Dry tester: Check for leaks by blowing air.
Inner surface seam spraying: Rust prevention coating on the inner surface of the seam weld.
Velomatic: Complete the can body by attaching the handle to the handle mounting ear.

  In the first embodiment of the can manufacturing system of the present invention, in the automatic line for manufacturing the can body 1, a fiducial mark application process is interposed between the seam welding process and the clear coating process, and an ear welder process is performed. A rotational position adjustment process is added to the front.

As shown in FIG. 3 , the reference mark application process includes an inkjet printer 5 installed in a conveyance path 4 in which the can body 11 as a workpiece is conveyed in a sideways state during seam welding, and the printer A transmission sensor 6 is arranged on the side in front of the head 5b, and a controller 60 for controlling the operation of the ink jet printer 5 based on a detection signal from the transmission sensor 6 is installed at a lower position. The printer head 5 b is disposed immediately above the can body 11 that passes through a gate-shaped head mounting frame 51 that straddles the conveyance path 4. 5c is an ink tube for feeding fluorescent ink from the lower printer body 5a to the printer head 5b, 52 is a tube support frame for supporting the ink tube 5c, and 53 is a signal lamp for displaying the processing status.

In the reference mark application process, when the can body 11 conveyed from the seam welding process passes the position of the transmission sensor 6, a detection signal is output from the transmission sensor 6, and the controller 60 is based on the detection signal. more actuation signal of the ink jet printer 5 is issued, the reference mark m is assigned coated by fluorescent ink ejected from the printer head 5b at a predetermined position of the top of the can body 11. Thus, as shown in FIGS. 4A and 4B, the seam welded portion s of the can body portion 11 conveyed in a lateral direction from the seam welding process via the conveying roller 4a of the conveying path 4 has the lowermost portion. Therefore, the reference mark m applied to the top portion of the seam weld portion s faces the seam weld portion s in the radial direction. The applied reference mark m becomes a substantially invisible hidden mark with the naked eye by using a substantially colorless and transparent fluorescent ink.

On the other hand, in the rotational position adjustment process, the can main body 1 is conveyed from the main plate seamer process in an inverted state with the main plate 12 side, that is, the bottom side up . First, in the primary adjustment portion P1 shown in FIG. The can body 1 is lifted from the conveyance path 4, and the can body 1 is rotated to one side in the circumferential direction (arrow a direction) in this lifted state, and the can body 1 is provided by the fluorescence sensors 7A and 7B including the ultraviolet light projecting section and the fluorescence light receiving section. A reference mark m that emits fluorescence is detected by projecting ultraviolet rays onto the outer peripheral surface of the lens. And, if the reference mark m comes to the rear end position in the radial direction along the conveying direction O as shown in the figure, by continuing to rotate the can body 1 by a specified angle from the direction at the time of detection and stopping it, of course, Further, the seam welded portion s of the can body 1 is at the front end position in the same radial direction.

In the example of FIG. 5, the light projecting / receiving shafts 71 and 72 of both fluorescent sensors 7A and 7B of the primary adjustment unit P1 are both oriented toward the axis of the can body 1, but the rotation direction a of the can body 1 is used as a reference. The angle α of the fluorescent sensor 7A with respect to the conveying direction O of the light projecting / receiving shaft 71 is set to 50 °, and the light transmitting / receiving shaft 72 of the fluorescent sensor 7B is set to 130 °. In this case, if the reference mark m of the can body 1 that has reached the primary adjustment portion P1 is at the position of m1 shown in the drawing, for example, the fluorescence sensor 7A detects the rotation of the can body 1 first. The can body 1 is rotated by 130 ° and stopped, so that the reference mark m comes to the radial rear end position along the transport direction O. Similarly, if the reference mark m of the reached can body 1 is at, for example, the position of m2 shown in the drawing, it is detected by the fluorescent sensor 7B first. Accordingly, the reference mark m is similarly positioned at the radial rear end position.

Even if the can body 1 is stopped by rotation of 50 ° from the detection by the fluorescent sensor 7B, the reference mark m should be at the rear end position in the radial direction as well, but the rotation amount until the stop is too small. Since it suddenly stops, the stop position is easily shifted by inertial force. Further, even if only one fluorescent sensor of the primary adjustment unit P1 is used, the detection of the reference mark m and the rotational position adjustment can be performed in the same manner. For example, when only the fluorescent sensor 7A is used, the reference mark m of the reached can body 1 is m2. If it is a position, the can main body 1 needs to make approximately one rotation before the detection, so that it takes time to adjust the rotation position and the production efficiency of the automatic line is lowered. Therefore, it is desirable to arrange the two fluorescent sensors 7A and 7B from the viewpoint of production efficiency, but in the example, both fluorescent sensors 7A and 7B are arranged with a phase difference of 80 ° to reach the primary adjustment unit P1. This is because the positional fluctuation of the reference mark m of the can main body 1 is normally within an angular range of ± several tens of the light projecting / receiving shaft 71 of the fluorescent sensor 7A. Of course, if the position variation of the reference mark m is large, the phase difference of both fluorescent sensors 7A and 7B may be increased accordingly, and if the reference mark m varies over the entire circumference, both fluorescent sensors 7A and 7B. Is recommended to be placed on both sides in the radial direction (180 ° phase difference).

In the rotational position adjustment process illustrated in FIG. 5 , the can main body 1 whose rotational position is adjusted by the primary adjustment part P1 is further rotated approximately 1/4 by the secondary adjustment part P2, thereby processing in the next ear welder process. The orientation is set to the orientation (ear welding from both sides in the width direction of the conveyance path 4). And in this secondary adjustment part P2, the can main body 1 is rotated in the circumferential direction one side (arrow a direction) in the state where it lifted from the conveyance path 4 similarly to the primary adjustment part P1. The fluorescent sensor 7C having a light receiving unit detects the reference mark m that is emitted by projecting ultraviolet rays onto the outer peripheral surface of the can body 1, and continues to rotate the can body 1 by a specified angle from the direction of detection and stops. By doing so, the fine adjustment is made so that the reference mark m and the seam welded portion s are precisely located on both sides in the radial direction along the width direction Q of the conveyance path 4. That is, the direction of the can body 1 may change slightly while moving from the primary adjustment section P1 to the secondary adjustment section P2. Therefore, the secondary adjustment section P2 simply rotates the can body 1 by 90 °. Rather, this rotational operation corrects the change in orientation accompanying the movement.

  Thus, the light projecting / receiving shaft 73 of the fluorescent sensor 7C in the secondary adjustment section P2 is oriented at the axis of the can body 1 at an angle γ of −20 ° with respect to the width direction Q of the transport path 4 and can rotate at a low speed. When one reference mark m is detected, the can body 1 is stopped by rotation of 20 ° from the time of detection, so that the reference mark m and the seam welded portion s are precisely in the radial direction along the width direction Q of the conveyance path 4. I try to come to both sides. In addition, since rotation of the can main body 1 in this secondary adjustment part P2 is set to low speed, even if the rotation amount until a stop is small, high stop position accuracy can be ensured. Thus, the can body 1 whose direction is precisely set by the secondary adjustment unit P2 is chucked in the rotational posture and carried into the ear welder process.

As shown in FIGS. 6 (a) and 6 (b), the rotating operation of the can body 1 in the primary and secondary adjusting portions P1 and P2 of the rotational position adjusting process is performed by first moving the can body 1 carried in an upside down state. A plurality of (four in the figure) circumferentially rotatable lifting cones 81 arranged in the vertical direction are lifted by supporting and lifting the upper peripheral edge 11c (arranged at the lower end by handstand) by the flange portions 81a of the lifting cones 81. . And the outer peripheral part between the upper end peripheral edge 11c of the can body 1 in the lifted state and the upper bead 11a is sandwiched between the driving roller 82 and the backup roller 83 from both sides in the radial direction, and the lifting type disposed above. The can retainer 9 is lowered, and a plurality (four in the figure) of idle rollers 91 attached to the lower surface side of the base plate 90 in the circumferential direction are attached to the lower end of the can main body 1 (the upper end is turned upside down). In this state, the drive roller 82 is rotationally driven to rotate the can body 1. Then, when the reference mark m of the can body 1 is detected by the fluorescent sensors 7A to 7C, the driving roller 82 has a predetermined rotation amount for each of the fluorescent sensors 7A to 7C from the detection point through a control device (not shown). Stop. In addition, the can body 1 is in a stable rotation state from the start to the stop of the rotation, by preventing the core swing from being caused by the elevating cone 81 and by preventing the upper can lift 9 from jumping upward. Retained.

Above you facilities embodiment, the automatic line for fabricating a can body 1 of the pail PC, feeding posture of the can body 1 (the can body 11), converted from landscape state when seam welding headstand state after the expander And, since the direction of the rotation direction varies variously during each intermediate processing, it is not constant, but the rotational position of the can body 1 can be precisely adjusted using the reference mark m before entering the ear welder. In the ear welder, the handle mounting ear 13 can be accurately welded to the seam welded portion s and its radially opposing position, and the can body 1 having no variation in the handle mounting position can be stably provided. Further, since the reference mark m can be detected without contact, there is no fear of scratching the surface of the can, and since the fluorescent color is detected by the fluorescence sensors 7A to 7C, the reference mark m is surely easily even if the reference mark m is small. It can be captured and there is no decrease in detection accuracy due to various colored coatings usually applied to the surface of the can body 11, and the reference mark m can be accurately and reliably expressed in a small size by the ink jet printer 5. The position accuracy of detection can be further increased.

1 can of body 11 can body 13 for bail ears 14 handle 5 inkjet printer 7A~7C fluorescence sensor PC pail m reference marks s seam weld

Claims (4)

In an automatic line that manufactures a pail can from a metal original plate or a processed product thereof by a continuous process including at least a tubular forming process, a seam welding process, a ground plate seamer process, an ear welder process, and a velmatic process from the upstream side of the line,
A reference mark application step is added next to the seam welding step, and a rotational position adjustment step is provided before the ear welder step.
After forming the cylindrical can body part by seam welding the both ends of the strip bent in the cylindrical forming process in the seam welding process,
In the reference mark coat-step, the seam weld at a predetermined position of the top of the can barrel which is conveyed sideways as the bottom, coating the reference mark by injecting fluorescent ink substantially colorless and transparent by the ink jet printer Attached,
After fixing the base plate to the lower end of the can body portion in the inverted state in the base plate seamer process,
Lift the can body that is conveyed in an inverted state in the rotational position adjustment step from the conveyance path,
As a primary adjustment, the can body in a lifted state is rotated to one side in the circumferential direction, and the reference mark that emits fluorescent light by projecting ultraviolet rays from a fixed position on the peripheral surface of the can body is detected, and the direction at the time of detection is detected. By continuing the rotation from the specified angle and stopping it, the orientation of the can body is set so that the reference mark comes before the rotation direction of the ultraviolet irradiation position in the next secondary adjustment,
Subsequently, as a secondary adjustment, the can body is rotated at a lower speed than the primary adjustment, and the reference mark that emits fluorescence by projecting ultraviolet rays from a fixed position onto the peripheral surface of the can body is detected. By continuing to rotate by a specified angle from the direction and stopping, the can body is precisely set to the orientation of the processing posture in the next ear welder process,
In the ear welder process, the handle mounting ears are welded to the upper position of the seam welded portion of the can body portion of the can body carried in the set direction and the radially opposed position, A can manufacturing system, wherein a handle is attached to the handle mounting ear.
As a primary adjustment in the rotational position adjustment step, the can body is projected by a specified angle from the direction of the can body that previously detected the reference mark by projecting ultraviolet rays from two different locations in the circumferential direction to the rotating can body. The can-making system according to claim 1, wherein the rotation is stopped by continuing the rotation . In the primary adjustment of the rotational position adjusting process, the can body is stopped so that the detected reference mark is positioned at the radial rear end position along the transport direction, and then the can body is rotated approximately ¼ in the secondary adjustment. The can-making system according to claim 1 or 2. The rotational position adjustment step includes a primary adjustment unit that performs the primary adjustment, and a secondary adjustment unit that performs the secondary adjustment, and moves the can body after the primary adjustment to the secondary adjustment unit. The can-making system according to any one of claims 1 to 3.

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