JPS6143101B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention is directed to a method for forming a side lock seam on the inner surface of a can after a bumping process for forming a side lock seam in a process of making a body of a square can such as an 18l can. The present invention relates to a side seam inner surface conveyance correction device for square cans that coats the seam with a correction coating film.

[Conventional technology]

Conventionally, in the body-making process of this type of square can, the bent edges of both sides of the can body blank are hooked together, and the bent edge engagement portions are pinched and crushed to form side lock seams. During the bumping process, scratches occur on the inner and outer surfaces of the can at the side lock seam, and in particular, the scratches on the inner surface of the can come into direct contact with the contents (detergent, mirin, sauce, etc.) that are filled after the can is made, and the contents of the base metal are damaged. This results in elution into the product and deterioration of both the can and its contents due to oxidative corrosion.

In addition, the side lock seams are coated with varnish to ensure good soldering, so they are susceptible to corrosion.Furthermore, since the side lock seams are crushed by bumping (one punch), the top and bottom plates are tightened using a seamer. (In the case of the seam seam part, the surface coatings of the top and bottom plates and the can body touch each other, making it airtight, but in the side lock seam part, a penetration gap is formed due to soldering.) ), the weak points in the sealing performance of square can bodies are concentrated in the side lock seams, where corrosion is more severe than in the seam seams.

For this reason, for example, in the conventional correction method, after forming the can body and wrapping the base plate, the position of the nozzle is fixed so that the inner surface of the side lock seam is coated with a coating film.
Since the can body is moved up and down by a lifter to spray and apply correction paint, the application speed is slow, and it cannot keep up with this type of can making speed of 60 cans/minute, causing production problems. Due to fluctuations during vertical movement and uneven speed, the correction paint film applied to the inner surface of the sidelock seam becomes uneven, resulting in thinner parts of the paint film.To avoid this, increase the amount of paint applied. However, paint was consumed more than necessary and was uneconomical. As a result, due to the diversification of contents and the increase in consumption in recent years, the amount of square cans required has continued to increase, and in order to meet this demand, the speed of can manufacturing through an integrated can manufacturing process has increased dramatically. On the other hand, the conventional seam correction on the inner surface of the square can body is not only inefficient but also causes poor correction as mentioned above, and the total speed of the can manufacturing process has been reduced, making it difficult to streamline the can manufacturing process. , streamlining, efficiency, centralization, labor saving, and manpower saving.

Next, prior to explaining the present invention, a step-by-step schematic diagram showing the processing procedure flow of the conventional can manufacturing process [First
This will be explained with reference to the figure.

The first step is to feed the stacked blank sheets a one by one, the second step is to cut the edges b' and b'' on both parallel sides along the conveyance direction, and the conveyance direction is turned at right angles, and the remaining Parallel side edges c′, c″ and multiple body plates d′,
3rd step of cutting edges into pieces d'', 4th step of evenly cutting the four corners of body plate d, 5th process of making end folds g' and g'' at the same time as frame f, and both sides of body plate d. A sixth step is to bend the seam to a predetermined width l at right angles in the same direction, and then bend the center at right angles and engage the end folded edges g' and g'' with each other and bump them at the same time to form the side lock seam part h. In addition to the shell-making process, which consists of a seventh step and an eighth step of forming flanges j' and j'' on the opening edges at both ends of the square can body i, which is oriented horizontally in a direction perpendicular to the conveying direction, an inverted square can A ninth step of tightening the main plate k to the upper opening edge of the can body i, a tenth step of tightening the top plate m to the upper opening edge of the square can body i that is inverted upside down, and Flux is applied from the side to the two parallel sides of the four-side seamed part o, and then heated.
The first step of wire soldering p1 and d2, and the square can n
The twelfth step is turning 90 degrees and applying flux from the side to the remaining two parallel sides of the four-side seamed part o, and then heating and wire soldering p3 and p4. A 13th step of applying flux from the side to the two parallel sides of the seamed part d of the rectangular can n whose four corners have been spot-heated, heating and wire soldering p5 and p6, and rotating the rectangular can n by 90 degrees. After applying flux from the side to the remaining two parallel sides of the four-sided seamed part q, heat and wire solder p7 and p8.
The 15th step is to apply flux to the side lock seam h of the square can oriented downward along the transport direction from directly below, heat it, wire solder p9, and then wipe it, and the inverted corner. The 16th step of washing the mold can n with water and then draining the water, and the 17th step of inserting the test head S into the opening r of the top plate m of the rectangular can n that is inverted and upright, and performing a leakage test are carried out in a sequential manner. It is processed through systematic processes.

[Problem that the invention seeks to solve]

In view of the above-mentioned problems, the present invention aims to provide an effective and appropriate conveyance correction device.

[Means for solving problems]

The present invention intervenes on the delivery route of the square can body from the seventh step of bumping process to the eighth process of flange forming process in the barrel forming process, which has been carried out according to the conventional procedure. It is characterized by the ability to smoothly carry out steps from the 1st to 17th steps of the can processing process, processing speed, and the functions of processing equipment.

〔Example〕

Embodiments of the invention will now be described with reference to FIGS. 2-6.

After the seventh step [bumping step] is completed, the square can body i that is shifted and discharged from the end of the body maker α is transferred to a flange (not shown) in the eighth step [flange step] in a right-angled horizontal state in the preceding stage. A speed change lever 3 and a speed change drive pulley 4 are attached to the shaft end 2 of a drive motor 1 fixed near the outside of a magnetic conveyor A, which is installed with its conveyance surface diagonally downward at an angle of 45 degrees over a magnetic turntable M to be converted and transported.
A speed change drive mechanism 5 equipped with a speed change drive pulley 6 is fixed, and a speed change driven mechanism 7 equipped with a speed change driven pulley 6 protruding parallel to the speed change drive pulley 4 near one side near the middle of the magnetic conveyor A is attached to an endless frame. A small transmission pulley 10 is fixed to the output shaft 9 of the speed change driven mechanism 7, which is variable in speed steplessly by adjusting the speed change lever 3, via a speed change V belt 8.
On the other hand, the above-described transmission is carried out via a transmission V-belt 13 stretched endlessly between a large transmission pulley 12 fixed to an end of a conveyor drive shaft 11 mounted on one drive side of the magnetic conveyor A and a small transmission pulley 10. The rotational torque from the output shaft 9 of the speed change driven mechanism 7 is transmitted to the conveyor drive pulley 14 fixed to the conveyor drive shaft 11. A conveyor belt 17 stretched endlessly over the conveyor drive pulley 14 and a conveyor driven pulley 16 attached to the conveyor driven shaft 15 mounted on the other end of the magnetic conveyor A so as to be freely rotatable is connected to the body maker α and the magnetic turntable. An electromagnetic or permanent magnetic block 1 is rotated endlessly at a constant speed between
Arrange and fix two pieces of 8 in parallel, body maker α
After completing the bumping process, the side lock of the can body i is hooked to the claw C' of the reciprocating carrier bar C and pushed out with the inside of the top corner d along the guide bar D cantilevered from the body maker α. The discharge posture with the seam part h facing straight down is maintained, the paper is adsorbed to prevent rolling, and the paper is fed to the magnetic turntable M at a constant speed. In addition,
A threaded rod 19 and a nut 20 fixed to the conveyor driven shaft 15 are for tensioning the conveyor belt 17.

Next, a correction device B that performs spray correction toward the inner side lock seam portion h of the can body i that is conveyed at a constant speed by the magnetic conveyor A is shown in FIGS. 2 to 4 and 6. The paint pipes p and The coating start point of the magnetic conveyor A is passed through the can body i during the bumping process via the compressed air pipe P'.
photoelectric sensors S _{1 and} S ₂ are installed at the coating start point x ₁ and at the coating end point x ₂ separated by a coating area It is installed on one side of the magnetic conveyor A that sends out the can bodies i, and the detection light sources L ₁ and L ₂ are passed from the spray unit U like the spray nozzles to the magnets through the inside of the can bodies i being bumped. Conveyor A coating start point
The photoelectric sensors S ₁ and S ₂ are installed opposite to the photoelectric sensors S ₁ and S ₂ at the coating end point x 1 and the coating end point x ₂ to detect the passage of the starting end of the can body i that has arrived at the coating area Upon detection by S ₁ , a spray start command signal is sent to the spray unit U, and the spray unit U receives the spray start command signal.
is the paint liquid to the paint pipe P and the compressed air pipe.
Compressed air starts to be supplied to P', but since the paint pipe p and the compressed air pipe p' are relatively long pipes, a predetermined time lag occurs before the spray paint is actually injected from the spray nozzle G. Since the can body i passes through the spray nozzle G by the area of the tip flange, the tip flange area becomes an uncoated area, and the passage of the starting edge of the can body i is detected by the sensor S ₂ by blocking the transmitted light from the detection light source L ₂ . Taking this as an opportunity, a spray stop command signal is sent to the spray unit U,
The spray unit U that receives the spray stop command signal stops the supply of paint liquid to the paint pipe P and the supply of compressed air to the compressed air pipe P', but does not actually spray paint from the spray nozzle G. Anticipating a predetermined time lag for stopping, the spraying operation of the spray nozzle G is ended when the inner surface of the side lock seam h of the can body i reaches a position leaving the flange area at the end, and spray correction is also performed as a non-coated area. That's how it happens.

In the embodiment of the present invention, the photoelectric sensors S ₁ and S ₂ have been described, but the present invention is not limited to this, and a proximity sensor that does not require the detection light sources L ₁ and L ₂ may be used.

Furthermore, in the embodiments of the present invention, the case in which a single magnetic conveyor A is installed and the processing target is a rectangular can with one side body (one side lock seam) has been explained, but the magnetic conveyor A is Two units can be stacked side by side to attract the two outer surfaces of can body i to further stabilize the delivery of can body i, and can be applied to square cans with two side bodies (two side lock seams). Needless to say.

The rectangular can side seam part conveyance correction device of the present invention constructed as described above is installed on a magnetic conveyor A on which bumped square cans i are conveyed at a constant speed.
Because it is firmly adsorbed to the conveying surface, there is no lateral movement during conveyance, and the sprayed paint from spray nozzle G is uniform and the applied edge is in a straight line.Also, as mentioned earlier, the flange processing part j' in the subsequent process is , j'', the installation positions of the spray nozzle G, detection photoelectric sensors S ₁ , S ₂ , and light sources L ₁ , L ₂ may be adjusted and set as appropriate to avoid coating the paint, saving paint and making the correction state uniform. The applied correction paint is then applied to the side lock seam area h in the 15th step.
The external heating of the can completely straightens and fixes the can, suppressing leakage from the inner seam of the can and deterioration of the contents as much as possible, and exhibits remarkable effects such as being able to make improvements without adding any large-scale equipment.

[Brief explanation of the drawing]

Fig. 1 is a step-by-step process schematic diagram showing the processing procedure of conventional can making processing, Fig. 2 is a step-by-step flowchart showing the work procedure before and after the device of the present invention is incorporated, and Figs. 3 and 4 are the steps according to the present invention. A plan view and a front view with some parts of the device omitted; FIG. 8 is a side view taken from the - line in FIG. 4;
FIG. 6 is a sectional view taken along the - line in FIG. 4. A...Magnetic conveyor, B...Correction device, C...Carrier bar, G...Spray nozzle, _L1 , _L2 ...Detection light source, M...Magnetic turntable, P...Paint piping, P '...Compressed air piping, _S1 , _S2 ...Photoelectric sensor, U...Spray unit, X...Application area, _x1 ...Application start point, _x2 ...Application end point, h...Side Lock seam part, i... Can body, α... Body maker.

Claims (1)

[Scope of Claims] 1. The side of the rectangular can body that is extruded and discharged from the body maker, which forms the rectangular can body by interlocking and connecting the end folds with each other, with the inside of the top corner along a guide bar that projects in a cantilever. at least one magnetic conveyor device that holds the lock seam portion in a constant position facing straight down and delivers the material at a constant speed; A pair of front and rear sensors each detect the passing of the starting end of the square can body and issue a spray start command signal and a spray stop command signal, respectively, and a side lock inside the square can body that is sent by the magnetic conveyor device. A square can side seam inner surface conveyance correction device comprising a spray nozzle facing the inner surface of the seam and whose spraying operation can be freely controlled by a spraying start command signal and a spraying stop command signal from the front and rear sensors. 2. The conveyor device extends along the rectangular can body delivery route between the body maker and the turntable disposed upstream of the flange. Conveyance correction device. 3. The square can side seam inner surface conveyance correcting device according to claim 1 or 2, wherein the conveyor device has a conveying surface for holding and conveying the square can bodies that is installed diagonally downward. 4. The pair of front and rear sensors can control the length of the application area on the inner surface of the side lock seam portion by adjusting the mutual spacing between them.
The square can side seam inner surface conveyance correction device according to item 2 or 3.