DE344097C - Tin snips - Google Patents

Description

BEBLIÖTHEEKV

. EUREAU V ". ··? JEH

5, INOlfcTfc: ■; ■;. · -GEHOOM J

ISSUED NOVEMBER 14, 1921

The invention relates to sheet metal shears, which are used for dividing, trimming and splitting of sheet metal is used. The novelty of the invention is "that the inclination win-S angle of the cutting edge of the upper knife against the lower knife by raising or lowering one The end of the upper knife holder can be changed. This raising and lowering of one end of the upper knife holder can be

ίο can be reached in different ways: For example by adjusting the angle of the associated end of the upper knife holder, acting on the pressure stilt of the upper knife holder or by the fact that

»5 the pivot point of the rocker is relocated, e.g. through an eccentric on which the Swing arm is mounted.

In the case of the tin snips according to the invention, an upper knife holder that moves in a straight line is provided

ao upper knife and cross knife provided, which act against a lower knife with cross knife.

Sheet metal shears, which are used for dividing, trimming and splitting sheet metal and upper

a5 knife and bottom knife with one each Have cross knives are known.

With these well-known machines that will

Dividing, trimming and splitting of the work

. pieces _ caused by parallel displacement of the upper knife holder so that the upper knife in addition to the transverse knife, opposite the lower knife and its transverse knife, can be brought to different heights ■ can. There are also tin snips that keep the cut strips from each Cut off the scissor stroke using transverse knives for splitting sheet metal made usable in that one for the purpose of switching off the cross knife or knives the tin snips has given double stroke, in the following way: During the larger of the two strokes guides the movable knife so far against the fixed one that the When the cross knife comes into operation, the smaller stroke does not guide the movable knife as much * 5 far down, but brings it up again before the transverse top knife does Touches sheet metal. There are then two eccentrics and two push rods for each stroke.

In the case of the machines mentioned above, splitting is made possible by the fact that the upper knife be brought to different heights with the transverse knife and that, if necessary, the lower transverse knife is higher or can be set lower.

According to the present invention, the purpose is achieved in that the inclination angle the cutting edge of the Obennessers by raising or lowering one end of the upper knife holder is changed. This \ '"explanation of the angle of inclination of the upper knife, which is provided in a known manner with a transverse knife, has opposite the height adjustment essential advantages of the upper knife holder. When cutting through large. Metal sheets of normal thickness will have the upper knife at the normal angle of inclination set, the condition is that the front cutting edge of the upper knife is not in The sheet metal to be cut penetrates. At this angle of inclination, the largest possible

he cutting length when cutting through splits «) of panels that have been I require pushing, achieved. Should be cut off strips from long panels be, so the metal sheets "be-.unted" are, the inclination angle s of the upper knife is reduced by so much that ch inmt the upper cross knife to the effect. Then it separates with every cut ti cut off strips, so that a hindered further pushing of the sheet ne stripe is achieved. The highest point of one end of the cutting edge of the > discretionary, so the largest angle of inclination nn used to be stronger than norile To cut sheets, but then with a much shorter cutting length. The setting of the upper knife holder, so ß the upper knife different, within .'eier extreme borderlines lying angles of inclination forms with the lower blade, ch has the advantage that the tin snips are advantageously used for cutting thin sheets : can rden. You can z. B. with echers, which are built for 16 mm sheets, Reduce the angle of inclination, e.g. cut 8 mm thick sheets, When a greater cutting length is achieved by reducing the angle of inclination the advantage that the sloping echstück undergoes fewer changes in shape is still growing.

It is thus compared to the known such machines by the present invention the purpose of use is essentially increased and generalized.

As already stated, the change in the angle of inclination of the upper knife lrch raising or lowering the upper knife filter at one end of the same by lying Means to be achieved. Then the upper knife holder is raised and lowered ι one end of this upper knife holder receives ne inclination, so would have to if e guide of the knife holder would be placed on the two ends of the same, this adapted to the inclined position of the upper knife neck and specially designed for each inclined position : rs to be set. To avoid this disadvantage; s constant adjustment of the leadership, carries with the present metal shears e fixed, the upper knife holder as Guide serving traverse a rotatable guide piece, which is due to its Mounting on a pivot according to: m changed angle of inclination of the obcress holder adjusts, whereby the latter ι keeps a safe guidance in all its positions. A well-known adjustable bar : lifts what is caused by wear and tear

Tin snips of this type are shown in the drawing.

Fig. Ι shows the essential parts of the same in longitudinal section, Fig. 2 in horizontal section,

Fig. 3 to 8 show means for adjusting the angle of the upper knife holder.

The upper knife holder 1 of the tin snips is moved up and down by means of pressure stilts 2 7 »and rockers 3, 4. The latter are coupled to one another by a rod 5 and are moved back and forth by the drive eccentric 6. The upper knife is denoted by 7, the fixed lower blade 8, the upper Ouermesser with 9, and "the lower Ouermesser with 10: If the m to be cut metal sheet in a position, the upper knife is below the normal angle of inclination against the lower blade, the 0th is the top, κ the bottom position of the upper knife.

To now the rocker 4, which acts on that end of the upper knife holder, on which the transverse upper cutter 9 is arranged, to be adjusted at an angle, it is to ·. the eccentric 12 of the bolt 13 is mounted. In the device shown in Fig. 3 and 4 the eccentric 12 is rotated and locked by means of a worm gear 15, 14. The other rocker 3, on the other hand, is mounted centrally on a bolt 16. By their storage on an eccentric, the rocker 4 can be placed such that the Oberinesserhalter 1 can be brought into the upper, lower or middle position.

In the embodiment according to Fig. 5 and 6, the eccentric 12 is adjusted and fixed relative to the frame 17 by a locking pin 18, which can be inserted into various holes of the disc 19 firmly seated on the bolt 13: The same adjustment of the rocker 4 against the Rocker 3 can also be achieved according to Fig. 7 and 8 in that the connecting rod 5 can be lengthened or shortened by the screw spindle Sb.

Instead of the devices shown, however, any other known devices can also be used Alechanisms are applied to the adjustment of the angle of inclination between the upper lind and the lower knife bring about.

The guide of the upper knife holder is carried out in the following way: In the 1 * 5 Upper knife holder serving as a guide traverse 20 is a rotatable guide piece 2t used, which then gives the upper knife holder 1 at 22 guidance when the latter has been rotated according to the changed angle of inclination. To this end is the guide piece with a pivot

stored in the traverse. The guide is through the wedge-shaped guide bar 24, which sits on the upper knife holder 1, adjustable. By adjusting the upper eater holder 1 at a correspondingly large angle of inclination, the effect of the upper Ouermesscrs 9 switched off; it can then 7 long metal sheets by means of the upper knife be cut up ("split> or split") with several cuts.

Claims (6)

Patent Claims: ι. Tin snips with a straight »5 moving upper knife holder and attached Cross knife for dividing, trimming and splitting of sheet metal, characterized in that that the angle of inclination of the cutting edge of the upper knife (7) by raising or lowering the upper knife holder (1) can be changed at the end associated with the transverse knife (9). 2. Sheet metal shears according to claim 1, characterized in that for the purpose of straight guidance of the upper knife holder (1) which can be raised and lowered at one end, the fixed, the upper knife (7) serving as a guide traverse (20) has a rotatable guide piece (21, 22, 23) carries, [\ v.which gives the upper knife holder (1) safe guidance even when the angle of inclination j changes.
3. embodiment of the tin snips ■ according to claim 1, characterized in that! that the lifting and lowering of the upper knife holder by relocating the axis of rotation! the rocker arm (4) associated with this upper knife holder end.
j 4th embodiment of the tin snips according to claim 3, characterized in that the relocation of the axis of rotation Swing arm (4) is carried out by an eccentric (13) serving as a bearing pin for the swing arm. 5. embodiment of the tin snips according to claim 1, characterized in that that the one-sided raising and lowering of the upper knife holder by angle adjustment the rocker arm (4) associated with this upper knife holder end. 6. embodiment of the tin snips according to claim 1, characterized in that that the angle adjustment of the rocker (4) by changing the length of the two rockers (3 and 4) connecting rod (5) takes place. 1 sheet of drawings.