JPH042799Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention is useful when forming paperboard, corrugated cardboard, etc. into a predetermined shape, for example, a packaging box, by forming a plurality of box outlines from a wide material, that is, a blank sheet. This invention relates to a slug removal unit, that is, a stripper device, of an automatic flat plate punching machine used when punching out sheets at once.

[Prior art]

Generally, this type of automatic flat plate punching machine has the structure shown in FIGS. 4 to 6. First, the fourth
The figure omits the male part of the stripper and shows a blank sheet 2 in which a cutting die with a predetermined outline is inserted on a female stripper die 1 made of plywood. A cutting die with the outline of the two rear row surfaces is inserted, and we would like to remove the scraps 3 (shaded area) between the two front row surfaces and the two rear row surfaces using a stripper device to save time in the subsequent process. In this case, in order to quickly remove and drop the scraps 3, the vertical bar 4 supporting the stripper female die 1 is disposed at a position that does not correspond to the scraps 3. However, with the arrangement of the vertical bar 4 in this manner, when the scrap part is pressed with a falling pin or plate, etc., depending on the shape of the outline, the female die of the stripper, especially the part indicated by the symbol A, may be damaged. This results in a cantilevered state, where the pressing force is concentrated and the stripper female die is likely to break, making it impossible to use the stripper female die formed in a predetermined contour shape for a long period of time.

Therefore, as shown in Fig. 5, we added a plurality of vertical bars 4' to strengthen the weak parts.
The stripper female mold 1 is supported.
At the position corresponding to the added vertical bar 4', a blade is attached to the cutting die in advance, and at the same time as the contour cutting die, the scrap part at the position corresponding to the vertical bar is also cut, so that it does not get caught on the vertical bar. This is taken into consideration.

[Problem that the invention attempts to solve]

However, as the work progresses, if gaps are created due to phenomena such as the cutting edge becoming dull or paper dust filling the contact point between the cutting blade and the cutting blade, the scrap 3 in that area will not be completely removed. As shown in FIG. 6, even if the male stripper die 5 falls off with the falling pin or plate 6, it will be caught on the vertical bar 4'. If the work continues in this state, the scraps 3 in that area will gradually accumulate, and the next blank sheet will collide with it and not be in the correct position.
Especially the rear row 2 of the processed blank sheets.
The surface may be left half-finished and damaged by the drop-off pin 6 of the male stripper, and these become further obstacles, causing a series of blank sheets to be stacked or left behind. There is a problem that many non-defective products are produced.

In addition, due to the above-mentioned overlapping state and the phenomenon of remaining parts, excessive force is applied to the drop-off pin 6, causing it to bend, and the work must be stopped to remove scraps and defective products or to correct the drop-off pin. There is also the problem that there is a loss of work time due to having to do so.

[Means for solving problems]

The present invention provides a stripper device comprising a male stripper plate equipped with a drop-off pin or plate and a female stripper die supported by a plurality of vertical bars, as a specific means for solving the problems of the conventional example.
To provide a stripper device for an automatic flat plate punching machine, characterized in that an auxiliary cutting blade is removably disposed on a vertical bar at a position corresponding to the cut scraps of a blank sheet, wherein the cut scraps are formed into a stripper female mold. The auxiliary cutting blade provided on the vertical bar that supports the blades ensures reliable cutting, so no scraps are caught on the vertical bar.

〔Example〕

Next, the present invention will be explained in more detail with reference to illustrated embodiments. In order to facilitate understanding, the same parts as in the conventional example will be described with the same reference numerals. In FIGS. 1 and 2, reference numeral 1 denotes a female stripper mold, and a supporting vertical bar 4' is provided on the lower surface of the female stripper mold so as to face the part where the scrap part is pushed down. A cutting blade 10 is detachably attached to this vertical bar 4'. The auxiliary cutting edge 10 has a substantially convex planar shape, and the convex top is the cutting edge 10.
A is a mounting base on both sides, and is mounted to the side surface of the vertical bar 4' by a pair of fixing blocks 11 via the base. This fixing block 11 has a substantially U-shaped cross section with a groove 12 into which the vertical bar 4' is fitted so that it can support the bases on both sides corresponding to the length of the auxiliary cutting edge 10, and has a substantially U-shaped cross section. It has a plurality of tightening bolts 13 that penetrate from the side surface to the groove 12.

When installing the auxiliary cutting blade 10 using this fixed block 11, the cutting edge 10a should face the part where the scraps are pushed down, and the fixing blocks 11 supporting the mounting bases on both sides should not come into contact with the scraps. The mounting base of the auxiliary cutting blade 10 and the vertical bar 4' are housed in the groove 12, and are firmly fixed by tightening each tightening bolt 13. The cutting edge 10a of the auxiliary cutting blade 10 installed in this manner is adjusted and installed so that it is at a slightly lower position than the upper surface of the female stripper mold 10.

As shown in FIG. 3, the stripper device of the present invention constructed in this way is configured to pass the scraps 3 of the blank sheet 2, which has been punched out into a predetermined contour using a cutting die and cut the scrap portion using a cutting blade, into the male stripper mold 5.
In the case of falling down with the falling pin 6, even if the cutting blade is not sharp and the scrap 3 is not completely cut,
The uncut portion due to the falling action is quickly cut by the auxiliary cutting blade 10 and falls, so that it does not get caught on the vertical bar 4'.

[Effect of idea]

As explained above, the stripper device of the automatic flat plate punching machine according to the present invention has an auxiliary cutting blade removably disposed on the vertical bar at a position that supports the stripper female mold and corresponds to the cut scraps of the blank sheet. Even if you cut the scraps at the position corresponding to the vertical bar with the step blade in order to remove the scraps in the same manner as in the die cutting process, even if the cutting is not completed completely for some reason, the stripper male mold will not work properly. Once the scraps were pushed down with the drop-off pin, the auxiliary cutting blade quickly cut off the uncut portion and dropped the scraps, preventing the scraps from getting caught on the vertical bar during work. There are various excellent effects such as no overlapping or left-over blank sheets, no defective products, and no loss of working time.

[Brief explanation of drawings]

Fig. 1 is a partial side view showing the main parts of the stripper device according to the present invention, Fig. 2 is a cross-sectional view taken along the - line in Fig. 1, and Fig. 3 is a schematic illustration of the main parts of the stripper device in use. 4 is a schematic plan view for explaining a conventional stripper device, FIG. 5 is a schematic plan view of a conventional example that is a further improvement of the device shown in FIG. 4, and FIG. FIG. 6 is an enlarged sectional view taken along line - in FIG. 5 in an operating state; 1... Stripper female mold, 2... Blank sheet, 3... Scraps, 4, 4'... Vertical bar, 5...
Stripper male type, 6... Falling pin or plate, 1
0...Auxiliary cutting edge, 10a...Blade tip, 11...Fixing block, 12...Groove, 13...Tightening bolt.

Claims (1)

[Claims for Utility Model Registration] (1) A stripper device consisting of a male stripper plate equipped with a drop-off pin or plate and a female stripper die supported by a plurality of vertical bars, capable of removing scraps from blank sheets. A stripper device for an automatic flat plate punching machine, characterized in that an auxiliary cutting blade is detachably arranged on a vertical bar at a position. (2) The stripper device for an automatic flat plate punching machine according to item 1 above, wherein the cutting edge of the auxiliary cutting blade is located at a slightly lower position than the upper surface of the female stripper die.