DE1907717A1 - Trimming scissors for rolled sheets with cross knife to cut off the hem strips - Google Patents

Description

1307717

MOELLER & NEUMANN GMBH 667 St, Ingbert, 12, 2, 1969

Pa 358 - 396 / He.

Trimming shears for rolled sheets with transverse knives to cut the edge strips

The invention relates to a trimmer for rolled sheets with a pair of long knives for trimming the sheet edge and cross knives for cutting the Saumstreι fen already separated from the sheet, the upper cross knife has its own drive and the λ cutting edge of the lower cross knife is lower than the cutting edge of the fixed lower long knife, This is a pair of trimmers with a pair of transverse knives on the outlet side, which cuts off the edge strips cut off in the previous trimming cut, (French patent 1,392,140, utility model 1,980,004)

The previously known types of trimming shears with a pair of transverse knives on the outlet side have in common that the moving upper transverse knife must be guided past the trimmed sheet metal edge as closely as possible in order to press the hinge strip still hanging on the sheet down against the lower transverse knife, which enables the upper transverse knife to be precisely adjusted every knife change required. If the cross knife is set too far towards the sheet, the trimmed sheet edge can be damaged. On the other hand, if it is set too short, its cutting edge does not cover the entire width of the hem strip. "But even if the upper transverse knife is properly adjusted, the scrap cut can be impaired, namely if a narrow hem strip becomes twisted and partly utiter ä & B trimmed sheet metal achieved. These difficulties "will-also. «Lent remedied ^ the upper transverse knife rältlv -to make the upper Laag knife movable and give it its own drive; They give what is also known as the cross- knife and has a quick advance of the sheet.

BATH ORIGINAL

"- - 19D7717

The problem at hand is solved according to the invention in that the upper transverse knife is carried in the manner of a so-called jaw scissors by a pivot lever which is mounted on a pivot axis which is arranged below the cutting edge of the lower long knife and runs approximately parallel to the long knives
is. In conjunction with the well-known feature of a deeper than
the lower long knife located lower transverse knife is here-. achieved by the fact that the upper, guided with its outer cutting edge end on an arch cross knife is able to reach under the trimmed sheet metal edge, so that it is together with the to under the

fl | Sheet metal reaching lower cross knife can grasp every seam strip in full width. The upper transverse knife does not need to be set so precisely after a knife change in order to get past the trimmed sheet metal edge, since a sufficiently large distance to the trimmed sheet metal edge can be set through the position of the pivot axis of the pivot lever carrying the transverse knife. The use of a known pair of scissors for the
A pair of transverse knives of a trimmer also has the advantage that - the thicker the sheet to be trimmed - the greater the cutting angle at which the upper transverse knife engages the seam strip. This benefits the force required when cutting a hem strip. The drive for moving the pivot lever with the upper transverse knife is expediently via a pull rod from

™ derived from the crankshaft, which is also the knife carrier for the top Long knife operated. V

The upper transverse knife is expediently arranged opposite the lower transverse knife so that it lies behind the lower transverse knife in the direction of advance of the sheet metal »-The cutting surface of the seaming strip · = · ■ fens.- ,, which results after the transverse knife cut nnä an der.- Me.s-fserbrust of the upper cross knife-attached _t required-an "own Masserruoksug in the direction of advance of-the-sheet *, do that. Upper cross - *" -knife with the Rüekhufo not on the cutting edge of the Sausi, which is still hanging on the sheet very much fans. Let ¥ orbeigi © iten sa. «A, special ·. - M © s @ © rrückg «g - for üß, a ob © re Qu © rm © sser- .vermsiöet- the invention
. by the fact that the upper transverse knife is in simer-tron of the vertical

4th BADORIGiNAt.

different level is performed in such a way that the knife face of the ■ » Cross knife forms an angle of more than 90 ° with the horizontal. For one. MaulScherenbauart of the cross knife pair this means that the pivot axis of the pivot lever in the feed direction of the sheet metal is sloping downwards. As a result, a seam strip is cut off in a plane that deviates slightly from the vertical, in the plane of seen from the upper limit of the cutting surface - that upper cross knife the upper edge of the hem strip still hanging on the sheet metal undercut something. Since the one level with the sheet metal still with this uniform seam strip through the upper 'cross knife until the lower cross knife is bent, * it will try to spring back to its original position after the cut. Due to the inclination of the cutting plane of the cross knife assembly by a few degrees when the hem strip springs back between its cutting surface and the chest of the a small distance between the upper transverse knife, which makes any knife retraction unnecessary for this knife.

In the drawing is. a trimmer according to the invention in an embodiment shown, namely show:

Fig. 1 is a partial front view,

Fig. 2 is a vertical section through the transverse knife arrangement according to the line IT-II in Fig.1 / and

Fig. 3 is a section along the line III-III in Fig.2.

The most essential. Parts of the trimming shears are, according to Fig. 1, the scissors stand IO with lower cutter bar 11, the pivotable upper cutter carrier 12 with upper cutter 13 and the transverse knife arrangement on the outlet side with the pivot lever 24 for the upper transverse knife 15 and the fixed lower transverse knife 16, which is well below the upper edge 17 of the lower long knife 18 is arranged . . '■; - ..

. 009836/0713

BAOORHStNAL *

The direction of advance of the sheet is indicated by arrow 20. Fig. 1 reveals the inclined cutting plane of the transverse knife assembly 14 to 16, whereby the knife face 15a of the upper Cross knife · 15 on the return stroke from the cutting surface of one still on Sheet metal hanging seam strip comes free if this after the Separation of a pushed-through piece of the hem strip naGfh springs back at the top. The separated seam strips fall onto one Slide 21, which conveys the seam strips onto a scrap transport located below the scissors,.

In the section according to FIG. 2, a double-armed pivot lever 24 can be seen with the knife saddle 25 for the upper transverse knife 15 and the lower transverse knife 16. The pivot lever; is on. a pivot axis 26 which is parallel to the long knives. , 13, 18, but according to FIG. 3 it is inclined in the scissors frame 10, specifically inclined downwards in the direction of the sheet metal feed 20, in order to set the inclined position of the cutting plane of the transverse knives 15 and 16 shown in FIG.

Since, according to the invention, the pivot axis 26 lies below the cutting edge of the lower long knife 18, the outermost tip of the upper transverse knife 15 describes an arc 27 during the cut, which runs at a distance from the trimmed edge of the sheet 30. The upper transverse knife 15 does not need to be retracted in the horizontal direction during the return stroke, as can the cutting area of the two transverse knives extend into the vertical projection of the trimmed sheet metal 30; '' ■ '* -_-

The rear end of the double-armed pivot lever, 24 is forked and. carries a pivot pin 28 to which a pull rod 40 is connected via a spherical bushing 29. The pull rod 40 is actuated by a large eccentric 42 of the crankshaft 41, also with the interposition of a spherical sleeve 43, "_;

- 5 - '■ "' -"

. OQ9836 / 0713

bad mt ^JsU * ^WU

The eccentric 42 is so that the upper transverse knife 15 from the Sheet metal 30 separated and up to the level of the lower transverse knife 16 downwardly tsdrüclct hem strip 31 begins to cut off. The direction of rotation of the eccentric 42 is indicated in FIG. 2 by an arrow. The crankshaft 41 is also the main crankshaft, which also actuates den.schwenkbaren knife carrier 12,

The mode of operation of the trimmer according to the invention is as follows:

When a sheet 30 by the Trelbrollen, not shown is advanced between the trimming knives 13 and 18, the "drive of the scissors is switched on, so that the upper long knife 13 goes downwards and cuts a seam strip 31. As shown in Fig, I. As can be seen, the cutting edge of the upper long knife 13 is curved at the inlet end, since this cutting edge in the lower Step out of the sheet metal cross-section at the dead point of the knife carrier 12 got to. The drives for the knife carrier 12 and the cross knife 15 are angularly offset from one another in such a way that the upper transverse knife 15 comes to the cut later than the upper long knife 13, but still cuts off the hem strip 31 during the hem cut. When both the knife carrier 12 and the Pivoting lever 24, the upper transverse knife 15 overtakes the upper long knife 13 because of the considerably greater eccentricity of the eccentric j ters 42 of the scrap knife arrangement compared to the eccentric, not shown, of the trimming knife drive. This got through the upper transverse knife 15 quickly in a top dead center position ', in which the hem strip 31 hanging on the sheet metal 30, although it is about is sprung back to the level of the plate 30, not hindered is. When a feed step is finished, the pivot lever 24 is already run through its top dead center position and approaching the shown gate position,

- patent claims -

0098 3S / 07 1 3

^BAD "%« "0A3

Claims (1)

MOELLER & NEUMANN GMBH 66 7 st. Ingbert, -den 12 ... 2-, 1969 Pa 358 - 396 / He. ":; Claims - l.J Trimming shears for rolled sheets with a pair of long knives for trimming the edge of the sheet and cross knives for cutting off the seam strips that have already been separated from the sheet, whereby α the upper cross knife has its own drive and the cutting edge of the lower transverse knife is lower than the cutting edge of the fixed lower long knife ', characterized in that the upper transverse knife (15) is carried by a pivot lever (24), äer on one below the cutting edge of the lower long knife (16) arranged, running approximately parallel to the long legs Pivot axis (26) is mounted, 2 "Trimming shears according to claim 1, characterized in that that the upper transverse knife (15) in a deviating from the vertical Level is guided in such a way that the knife face. (15a.) of the transverse knife forms an angle of more than 90 with the horizontal. 3. Trimming shears according to part 2, characterized in that that the pivot axis (26) of the pivot lever (24) in Vorsehubrichtung of the plate (30) is inclined downwards. : 0098 36/0713 BATH ORIGINAL