JPS6154491B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure for connecting the ends of a band-shaped metal plate (hereinafter referred to as a strip), in particular, a method for manufacturing tabs of a predetermined shape for tearing score lines of an easy-opening lid by punching them at predetermined intervals. This relates to a structure in which one end of a strip used for this purpose is connected to one end of a strip of the same width.

FIG. 1 shows an example of a strip feeding situation in the case of such a tab structure. A shows a strip of aluminum material wound into a coil, and is supported by a strip support 1. As shown in FIG. The starting end of this strip is inserted into the feed rolls 3, 3' of the strip feed device 2, the rolls are rotated, and the strip is sent to the transfer press 5. At this time, the strip should form a loop 6. 4 is a detector for detecting the lower end position 7 of the hanging strip. The strip inserted into the transfer press advances a predetermined length during one stroke of the transfer press and then stops, and while it is stopped, it undergoes tab processing such as cutting and bending. The finished tab is separated from the strip and dropped from the transfer press. After the tabs have been separated, the strip becomes a perforated band and is delivered from a transfer press.

Thus, while the transfer press is in operation, the strip is advanced a predetermined length during one stroke of the press, and this is repeated to produce successive tabs. On the other hand, a can lid forming press (not shown) is installed near the transfer press, which operates in synchronization with the press and performs operations including the process of fixing the finished tab to the can lid. This can lid forming press is supplied with can lids that have undergone basic molding from one side, and tabs that have been formed by a transfer press from the other side. The can lid is formed into a predetermined shape while passing through the forming press, the tab is fixed, and the can lid is sent out as a finished product.

By the way, as long as the tabs are made into a predetermined shape from the strip and supplied, the finished can lid is delivered from the can lid forming press, but the last tab is made at the end of the strip and it is the final tab. If a tab is supplied to the next can lid, the tab will not be supplied to the next can lid for the reason described below, or an incomplete tab will be supplied to the can lid. There was a defect that would require manual attachment or replacement of a separately manufactured tab with a predetermined shape.

The reason for this will be explained with reference to FIGS. 2 and 3.

Figure 2 shows the tail of the leading strip B after the final punching, and the minimum spacing l between each punching hole, e.g. The distance must be approximately
It is said to be 1.5mm. After punching out the final tab, this strip B leaves a predetermined distance (approximately 1.5 mm in this case) from the punched hole 10 and is
- Cut with X-rays (otherwise, the part indicated by the dotted line will be separated from the strip, and the chips will enter between the processing dies, etc., causing problems in subsequent processing). Next, the starting edge 72 of the trailing strip C is
It is brought into contact with the edge formed by the cutting line XX of the preceding strip B (FIG. 3), and is advanced through the transfer press without separating both strips. Then, since the tabs are punched out at intervals of 1.5 mm, the first tab of the trailing strip C will be cut with a portion of its front periphery touching the edge 72; Since there is no metal part of the required width on the starting end side, it is impossible to cut cleanly, and therefore a tab of a predetermined shape cannot be formed. Therefore, tabs that do not have the specified shape are supplied. Also, if the work is carried out by bringing the starting edge of the trailing strip C into contact with the ending edge of the leading strip B without performing the above-mentioned cutting along the X-X line, the tab punching will span both strips B and C. If this happens, the chips will cause the press to malfunction, and the tab itself will not be supplied to the can lid.

In order to prevent the press from malfunctioning due to such chips, the terminal end of the preceding strip B is cut so that the minimum scrap width remains, and the starting end of the following strip C is punched out at the terminal end of that strip B. The sheets are then fed to the transfer press at intervals that are multiples of the tab forming pitch.
Then, starting just before the end of the leading strip B comes out of the transfer press, the press is rotated once and then stopped, and then the press is rotated once and then stopped, and the tab is removed from the transfer press. The current situation is to manually supply separately manufactured tabs to can lids that have not been supplied, to prevent unfinished can lids from being mixed in with a large number of completed can lids. . This manual work is done approximately every three hours in tab molding.

However, in press work for continuous production, such manual intervention is a disadvantage in terms of both labor and time.

The present invention was developed with the aim of eliminating these losses, and its features include the terminal portion of the preceding strip where punching of a predetermined shape is performed at predetermined intervals, and the end portion of the preceding strip where the same punching is performed following the preceding strip. The end connecting structure is formed by overlapping and adhering the starting ends of the row strips, and the overlapping part has an alignment hole or notch that passes through both of the strips, and furthermore, The center portion of the end edge is close to, but does not contact, the front peripheral edge portion of the punched hole in the trailing strip when the final punching of the leading strip and the first punching of the trailing strip are performed across the overlapping portion. The center portion of the starting edge of the trailing strip is shaped to be close to, but not in contact with, the trailing peripheral edge of the final punched hole in the leading strip.

An example of the present invention will be explained below with reference to the drawings.

FIG. 4 is a plan view showing the end connecting structure of the present invention, FIG. 5 is a plan view showing the ends of each strip before polymerization, 20 is a preceding strip;
21 is the terminal end thereof, 23 is the terminal edge thereof, 22 is the final tab punching hole of the strip 20, 24 and 25 are alignment holes provided in the terminal end, 26 is the arc-shaped center part of the terminal end 23, and 30 is the trailing edge. In the strip, 31 is the starting end, 33 is the starting edge, 32 is the first tab punched hole of the strip 30, and 34 and 35 are alignment holes provided in the starting edge.
It has the same diameter as 25 and is provided at a position that matches the holes 24 and 25 when the terminal end portion 21 and the starting end portion 31 are overlapped. Reference numeral 36 indicates a wide arc-shaped central portion of the starting edge 33.

Starting end 31 of strip 30 and strip 2
The terminal end 21 of 0 is the alignment hole 24, 25, 3
4 and 35 are aligned, overlapped, and adhered to form an overlapping part (FIG. 4).

Thus, the center portion 36 of the starting edge 33 and the ending edge 23
The central part 26 of the strip is defined by the respective punched holes 2 that are formed when the final punching in the preceding strip and the first punching in the trailing strip are performed at predetermined intervals while sandwiching the overlapping portion thus created.
2 and 32, and the starting edge center part 3
6 is close to but not in contact with the rear peripheral portion 27 of the hole 22 and lies substantially parallel and outward;
The terminal edge center portion 26 is shaped so that it is close to, but not in contact with, the front peripheral portion 37 of the hole 32, and lies generally parallel and outward. In this example, the peripheries of the punched holes are approximately circular, so they each have an arc shape.

Thus, the width l at the closest point 11 between the holes 22 and 32 is approximately 1.5 mm.

Next, an example of a procedure for forming the above-mentioned end portion while performing a punching operation will be explained with reference to FIG.

In FIG. 5, the same reference numerals as in FIG. 4 indicate the same parts as in FIG. 12,
Reference numerals 13 and 14 indicate holes punched in the initial step of the tab forming process, and the holes of two adjacent tabs are simultaneously machined. Reference numerals 15 and 15' indicate gauge holes that are provided for every two punched holes in the tabs in order to advance the strip accurately by the pitch dimension of two tabs in the transfer press. It gets pulled out. When the pitch dimension for the above two tabs is 49 mm, from the distal end 50 of the preceding strip 20 to the gauge hole 1 closest to the distal end 50
When the remaining length up to 5 is about 550mm,
Stop the transfer press and the can lid forming press, and measure the pitch dimension (49 mm) from the center O of the gauge hole.
At the same time, punch out alignment holes (diameter 4 mm) 24 and 25 for the overlapping part at a length 11 times the length of O 1 and O 2 of both holes, and at the same time connect the line Y-Y connecting the centers O ₁ and O ₂ of both holes to the end edge. The final distance S from the center part 26 is slightly smaller than 1/2 of the minimum scrap width (approximately 1.5 mm) (approx.
The front periphery 3 of the punched hole 32 so that the diameter is 0.7 mm.
A terminal edge 23 is formed by punching an arcuate line of the rear edge central portion 26 running parallel to 7 and an edge passing 5 mm from the Y-Y line and parallel to the Y-Y line. Meanwhile, the leading edge 60 of the trailing strip 30 also has a terminal edge 23 and a symmetrical starting edge 3.
3. Cut or punch out alignment holes 34 and 35 corresponding to alignment holes 24 and 25.

One specific example of an instrument for forming the ends and beginnings of these strips will be described with reference to FIG.

In Figure 6, D is the lower mold, E is the upper mold, and 69
61 is a semicircular notch provided at the tip of the substrate and fitted with a gauge pin for positioning the strip in advance in a transfer press. As a die part for cutting the end portion 50 of the preceding strip, the center 62 of the arc of the notch 61
From the tab punching pitch (49) in the longitudinal direction of the board 69
A line W-W passing through a point 11 times the length L (539 mm) and perpendicular to the longitudinal direction of the substrate 69, and a line V passing through the center 62 of the notch 61 and parallel to the longitudinal direction of the substrate 69.
- A first hole 63 of the lower mold for punching a hole with a diameter of 4 mm centered at the intersection 64 with V, at a distance equal to the distance from the hole 63 to the alignment holes 24, 25 (FIG. 4) on the line W-W. The lower die has a second hole 63' for punching a hole with a diameter of 4 mm centered at the hole 63,
63' to the left of the figure, 5mm from line W-W
The part of the blade that lies on the line R-R parallel to the line W-W and the part that is on the right side of the figure from the line R-R and that is parallel to the line W-W
A part with a cutting blade 65 having a blade portion located on an arc 67 (which corresponds to the arc line of the central part 26 of the terminal edge of the strip 20 described above) with a distance of 0.7 mm at the narrowest point from W. use. or,
As a die part for cutting the tip end 60 of the trailing strip, the intersection point 74 of the line T-T and the line V-V, which are parallel to the line W-W with an interval of about 75 mm from the line W-W, and the intersection point 74, the third and fourth holes 73 and 73' of the lower mold are punched with holes having a diameter of 4 mm, respectively, centered at positions equidistant from the alignment holes 24 and 25, and from the line T-T. A component having a cutting blade 75 symmetrical to the cutting blade 65 described above is used on the right side.

In addition, guide plates 68, 6 are provided for guiding the strip.
8' and 78, 78' are provided on the outside of each of the above-mentioned parts, and the cutting blades 65, 7 are provided between the two cutting blades 65, 75.
Pins 80 and 80' for guiding the upper mold are provided on both outer sides of the mold. Note that there is a space between the two cutting blades 65 and 75 that penetrates to the bottom surface of the substrate 69.

In order to cooperate with each part of the lower mold D, the upper mold E has through holes 90 and 90' that can be slid up and down on the upper mold guide pins 80 and 80', and a hole 63 in the lower mold for punching a positioning hole. Upper cutters 92, 92' and 93, 93' that fit into 63' and 73, 73', cutting blade 6
It has upper cutting blades 94, 95 and a base 100 which cooperate with 5, 75 to cut the strip.

Therefore, the end portion of the leading strip 20 is placed on the substrate 69, and the substrate is placed on a transfer press, the notch 61 at the tip is brought into contact with the side surface of the gauge pin of the transfer press, and the end portion of the strip 20 is placed on the substrate 69. 50 to guide plates 68, 68'
It passes through the gap and faces above the cutting blade 65. Needless to say, at this time, the strip should be kept in a state with no slack.

On the other hand, the leading edge 60 of the trailing strip 30 is inserted between the guide plates 78, 78' until its leading edge extends beyond the straight portion of the cutting blade 75.

While inserting these strips 20, 30, the upper mold E is above the lower mold D, and when the positions of both strips are determined, the upper mold E is lowered and the upper surface of the upper mold is lightened, preferably with a hammer. Hit it,
Cut the ends of both strips. Thereafter, the upper mold is raised and both strips are separated from the lower mold and taken out.

Next, the overlapping portions of the ends 21 and 31 of both strips are aligned using a strip end alignment component as shown in FIG. The parts in Figure 7 are:
Board 110, guide pins 111, 111' set up on board 110 in accordance with the spacing between alignment holes 24, 25 (FIG. 4), and guide pins 111, 11.
1', guide plates 112, 1 having parallel surfaces and fixed at intervals equal to the width of the strip.
12'.

Insert the alignment holes in the ends of either of the cut strips into the guide pins 111, 111', and then polish the ends of the other strips, preferably about 10 mm from the edges; A metal adhesive (preferably instantaneous adhesive) is applied there, the positioning holes at the ends are inserted into the guide pins 111, 111', and the overlapping portions are pressed by appropriate means. After the bonding is complete, the part (Figure 7) is removed and the press is started.

Since the overlapping location is formed exactly in the middle between the tab punched holes, the tabs can be continuously formed and supplied without chipping.

In the above example, the alignment holes are 24, 25 and 3.
4 and 35, but the strip side guide plates 68, 68' and 78, 78' (Fig. 6)
and 112, 112' (FIG. 7), one each may be used. Also, for alignment,
In addition to the holes of the above-described specific example, notches 113 and 113' as shown in FIG. 8 can also be used.

In the above specific example, the cutting position of the end portion 50 of the strip (preceding) was set at a distance 11 times from the initial processing position of tab forming, but this is just one example, and the pitch of the punched tab It can be any multiple of . Also, although both strips were cut at the same time, they may be cut separately.

When using the connecting structure of the present invention, the positioning of both strips is performed quickly and reliably, the bonding area is sufficient, the bonding strength is high, and it can withstand automatic feeding. Moreover, the tabs can be manufactured without interruption. Since the tabs are supplied, work efficiency is improved, and there is also the advantage that there is no need to separately manufacture the tabs in advance.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the feeding status of the strip, Fig. 2 is a plan view showing the state after the tab has been punched out from the strip, and Fig. 3 is a plan view showing the state after the tab is punched out from the strip. FIG. 4 is a plan view showing the end connecting structure of the present invention; FIG. 5 is a plan view showing the cut shape of the ends of both strips to form the connecting structure of the present invention; Fig. 6 is an isolated perspective view of a device for forming the ends of both strips (one example), Fig. 7 is a perspective view of a component for overlapping and positioning the ends of both strips, and Fig. 8 shows other positioning means for both strips. FIG. In the figure, 20: leading strip, 21: its terminal end, 23: its terminal edge, 26: central part of its terminal edge,
30: trailing strip, 31: its starting end, 3
3: its starting edge, 36: central part of the starting edge, 22,
32: punched hole, 37: front peripheral part of hole 32,
27: Rear peripheral edge portion of hole 22, 24, 25, 3
4, 35: Positioning holes; 113, 113': Positioning notches.

Claims (1)

[Scope of Claims] 1. Overlapping the terminal end of a leading strip (band-shaped metal plate) that is punched in a predetermined shape at a predetermined interval and the starting end of a trailing strip that is punched in the same way following the leading strip, The end connecting structure is formed by adhesion, and the overlapping portion has an alignment hole or notch passing through both of the strips, and the central portion of the terminal edge of the leading strip is connected to the overlapping portion. When the final punching of the leading strip and the first punching of the trailing strip are performed, the shape is close to but not in contact with the front peripheral edge of the punched hole in the trailing strip. The central portion of the starting edge of the row strip is shaped to be close to, but not in contact with, the rear peripheral edge portion of the final punched hole in the preceding strip. A structure for connecting the ends of band-shaped metal plates.