DE1660132A1 - Machine for punching out work pieces, for example shoe shafts - Google Patents

Description

Dipl.-Phys. Frifz Finally

Patent attorney "I 66 U

8034 Unferpfaffenhofen b. MOmften

Blumensfr, 5

Description of the patent application

of UNITED SHOE MACHINERY CORPORATION in Plemington, New Jersey, and Boston, Massachusetts, V.St.ν.America

concerning:

Machine for punching out workpieces, for example shoe uppers

Priority: November 16, 1966 - Great Britain

This invention relates to a machine for punching and stacking workpieces from an endless supply of sheet material, consisting of a punching arm provided with a punching knife holding and triggering device and a movable die block having a feed table for placing certain lengths of sheet material on the die block and for transferring punched workpieces from the punching block into a stacking device.

In such systems, it is not only necessary that they all directly connected with the punching work steps without human control are able to carry out trouble-free and without damaging the workpieces, but it is equally important to the performance and economy of the systems

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ORIQiNAt INSPECTEO

to ensure that they can be used without excessive physical effort on the part of the operator can be equipped with punching knives and that the knives are also returned automatically can be. The possibility of automatic knife pick-up and delivery is desirable for the reason that than that punching knives of automatic punching systems are much heavier than punching dies of conventional swing arm punching machines.

With the advent of leather substitutes, which are usually supplied in rolls, there are also punching machines of workpieces made from these materials. These are generally so-called cart beam punches or swivel arm punches equipped with two punching arms. Both types of machines are more or less satisfactory their purpose. Barrow punching machines are limited in the size of their punching carts with respect to the punching pad. This disadvantage is at the expense of the speed by the punching cart executing punching strokes one after the other across the width of the material to be punched Tried to balance. In addition, it is necessary with these machines that the punching knife is in each case by hand on the punching cart must be attached or detached from it. The swivel arm punches, which are equipped with two punching arms, are all adherent the disadvantage that after each punching stroke of each punching arm, the punching dies are redesigned on the material to be punched have to. This work is time consuming and allows too much waste.

ORlCKNAt INSPECTED

The invention has the object of providing an automatic System for punching out workpieces, e.g. shoe uppers, from sheet-shaped materials to create the ones with current Punching overcomes associated disadvantages by automatically introducing the material into the system and punching it the punched pieces are automatically removed from the punching bed and fed to a stacker and by using the punching knife can be automatically attached to and detached from the punch arm.

This object is achieved according to the invention in that the punch knife holding and release device from the combination of optionally operable clamping rails for holding or releasing the with them aligned punching knife and the feed table movable with respect to the clamping rails, provided with a holding device for Alignment of the punch knife with respect to the clamping rails.

According to a further characteristic of the invention, the feed table is between a retracted and an advanced one Movable position with respect to the punching block, with an aboriginal part of the table in the retracted position between the punching arm and Punching block and in the advanced position under a separating device away from the punching arm, the holding device holds a punched workpiece against movement with the feed table in its retracted position.

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The object of the invention is also achieved in that the stacking device consists of a during the movement of the punching block upward moving table against the punch arm, which is in contact with the top surface of the stacker sensors responding to the underside of the in-feed table to interrupt the upward movement of the stacker is provided.

An embodiment of the invention is shown in the drawings and is described in detail below. Show it:

Figure 1 is a left side elevational view of the invention Machine including punch, feed table, conveyor belt and stacker;

FIG. 2 is an enlarged front elevation of the machine of FIG front with parts of the device shown in Fig. 1 include ™ borrowed the device for holding and releasing the punch knife;

Figures 3, H and 5 show details of the punch knife holding and triggering device;

Fig. 6 is a rear elevation of the device shown in Fig. 1, in particular of the stacking device;

Fig. 7 is a front elevation and on an enlarged scale of the

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Feed table with a clamp arm for holding sheet material and means on the punch arm for controlling the amount of movement of the infeed table;

Pig. 8 is a left side elevation, partly in broken away Illustration of the parts shown in FIG. 7;

9 shows a plan view, partly in a broken representation, a part of the device shown in Fig. 1;

Fig. 10 is a left elevational view, on an enlarged scale, of the part shown in Fig. 9;

Fig. 11 is a rear elevational view of the portion shown in Fig. 10, partially broken away;

12 shows in detail and on an enlarged scale a sensor head of the device shown;

13 shows the pneumatic or hydraulic control circuit in a diagram the machine's stacking device;

1h shows, on an enlarged scale, a side elevation of the separating device of the machine;

15 and 16 the separating device in different stages

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during an operation;

Fig. 17 shows on an enlarged scale and partly in section the devices for aligning the punch knife;

18 shows the electrical control circuit of the device in the diagram.

The machine shown in Fig. 1 is composed of a punch 30, the punching block 38 with respect to a fixed Punch arm 42 is movable, a feed table 32 which can be moved back and forth with respect to the punch 30, a conveyor belt 34 for placing punched material on the feed table 32 and a Stacking device 36 for stacking punched workpieces.

The punching block 38 can be moved up and down on four columns 40 with respect to the punching arm 42. The punch arm 42 carries a punch knife K, consisting of a back plate 44, e.g. made of steel, a wooden template 46 and a blade 48 attached to it The area circumscribed by the blade 48 is provided with an ejector 50 made of resilient material. On both sides of the Brackets 52 are provided on the punching arms 42 and are as long as the punching arm 42. Screws 56 are attached to the brackets 52 a ground steel plate 54 attached to the punch arm surface covered and which serves to give the punch knife K support. The screws 56 at the same time each carry one of the "

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Plate 54 protruding truncated cone peg 58. The pegs 58 fit into correspondingly designed bores 60 in the plate 44, so that the punch knife K is in a certain position on the punch arm 42 is recorded.

Device for holding and releasing the punch knife.

The punch knife K is carried by clamping rails 62 on the punch arm 42. A clamping rail 62 is slidably attached to each of the holders 52, specifically slots 6 * 1 are provided in the clamping rails 62, each of which receives a screw 66 connected to the plate 54 and the holder 52. Each screw 66 is screwed to a block 68 against which the clamping rail 62 rests. In the holders 52 openings 70 are provided which receive springs 72, so that the clamping rails 62 are pressed upwards against the blocks 68 with respect to the holders 52.

A piston-cylinder unit CcI is attached to the punching arm 42, its piston rod 74 via a bracket 76 with one of the two Clamping rails 62 is connected. Another piston-cylinder unit Cc2 on the opposite side of the punching arm 42 is connected with its piston rod 78 via a second bracket 80 to the other clamping rail 62.

Each Klenun rail 62 has several, for example four slots 82, which are open towards the punching block. The slots 82 are in

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the clamping rails 62 designed so that they are with the punching knife plate 44 protruding lugs 84 coincide locally. Accordingly, the noses 84 become one on the punching block 38 correctly designed knife K penetrate into the slots 82 during an upward movement of the punching block.

Some of the slots 82 in the two clamping ^{rails 62 are equipped with microswitches LS6, LS7, Ls8 and LS} ? (Fig. 18) provided. Each switch has a downwardly projecting spring-loaded piston 86. The pistons 86 run through openings 88, in the rails 62 and through openings in the mountings 52 and the plate 54 into the slots 82. The piston 86 protrudes from the plate 54 so that the back plate 44 of the punch knife K can place against it.

If a punching knife is to be attached to the punching arm, the microswitches LS6, LS7, LS8 and LS9 of the punching knife K switched, which is moved from the punching block 38 to the punching arm 4 2. As a result, the piston-cylinder units CeI and Gc2 switched on and the clamping rails 62 moved to the left or to the right, with beveled edges 82a below

put in the slots 82 penetrated lugs 84 and the punch knife Clamp K against plate 54.

contraption for aligning of Punching knife «

So that the punch knife K on the punching block 32 before loading on the punching arm 42 with respect to the clamping rails 62 exactly

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can be designed, a holding device 90 is provided to which devices necessary for aligning the knife can be attached. The holding device 90 is _{/ v} transverse over the feed table 32 role ^ grooves is provided 92nd The grooves 92 are at the same distance from one another as the lugs 84 on the punching knife holding plate 44.

The operator inserts blocks 94 into these grooves 92 in the form an upside-down U, the feet 102 of which are magnetized. The blocks 94 have lugs 96 from which pins 98 protrude. Since in the lugs 84 holes 100 are gone, which on the Pins 98 can be inserted, a knife K to be fastened to the punching arm 42 can be attached to the clamping member 90 with respect to the clamping rails 62 are precisely aligned on the feed table 32 before it is driven onto the punching block 38 and with the knife against the Punch arm 42 is raised. After the knife K has jammed against the plate 54 on the punching arm 42 in the manner described above has been, the punching block 38 is lowered from the punch arm. The pins 98 slide out of the openings 100 before the Feed table 38 returns to its initial position.

Infeed table

The feed table 32 has an insertion part consisting of a hardened steel plate 104, which during a punching stroke the

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Sheet material carries, a discharge part made of a plastic plate 106, which receives the punched parts and feeds them to the stacking device 36, and a separating member in the form of a transparent plastic disc 108. The three plates 10 ¹ I, 106 and 108 form a unit and are on two Support bars 110 ae attached and form an uninterrupted surface. The rods 110 lie in grooves 112 embedded in the punching block 38, with rollers 114 being provided in recesses 116 provided in the grooves 112, which rollers protrude into the grooves under the pressure of springs 118. The feed table 32 thus runs freely during its movement onto the punching block 38 and away from it, but is pressed against the punching block during a punching stroke.

At the front of the two support rods 110 (FIGS. 7 and 8) there is a plate 120 supported by a hollow rod 122. To both A flat iron piece 124 is attached to the ends of the rod 122. To it two rollers 126 are supported, which run in rails 128 in carriers 130. The carriers 130 run in the punching block 38 from the front to the rear.

A holder 132 with a roller 13 ^ is provided on the rear part of each support rod 110. The rollers 13 ** are designed in such a way that that they run in rails 136 on further carriers 138. The carriers 138 protrude from the rear part of the punching block 38.

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The feed table 32 is also carried in its center by four twin rollers I ¹ IO, two of which are attached to brackets at the front and two to brackets at the rear of the punching block 38.

The feed table 32 is thus always supported during its movements in the machine. When the table 32 rests in its front position, the steel plate 1O ¹ I lies under the punching arm ^ 2, while the plate 106 lies above the stacking device 36. When the table rests in its retracted position, the plate 106 is under the punch arm * J2. In order to move the feed table 32, a piston-cylinder unit CH1 is provided. Its piston rod I ¹ J ¹ J is articulated to an extension piece I ¹ Jo which protrudes from the rod 122.

The amount of movement of the feed table 32 can be changed. Since the front position of the feed table 32 under the punching arm k2 is always the same, the retracted position must be changed according to the desired length of the feed tube Valve VHl. The valve VH1 is switched by a cam 1 ^ 8 attached to a rotary bushing 150. The rotary bush 150 is housed in a bore 152 in the punching block 38 and is screwed onto one end of a spindle 15 ¹ * , the other end of which is rotatably anchored in the plate 146

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and is provided with a hand wheel 156. The respective location of the cam 148 can be changed by turning the wheel 156, by changing the position of bushing 150 on rod 154.

The rotary sleeve 150 lies in a square opening 158 in a flanged bushing l60. The bushing l60 is attached to the front of the punching block 38 and can be shaped around the length of an arcuate one Slot 164 in the clamping screw «Kl62 are rotated, for what purpose there is a handle 166 which is connected to the splash via a handlebar 168. By rotating the Flange can be the cam 148 from a working position in which he during a movement of the feed table 32 a piston 151 of the Valve VHl actuated, and an empty position, in which it does not impinge on the piston 151, adjusted.

Not only does the process of moving the valve VHl: de ^ Infeed table stopped in its retracted position, but it is also the clamping member 90 out of its from the upper Area of the feed table 32 remote empty position moved away into the working position.

The already mentioned clamping member 90 is a roller rotating about a shaft 170. The shaft 170 is supported at both ends by arms of two angle levers 172 which are pivotable about pin 174 ver. The pins 17 ^ are stored in the flat iron pieces. The other arm of both angle levers 172 is attached to handlebar 176.

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directs that for a with respect to the feed table 32 transversely Movement are supported in bearings 178 which protrude from the lower surface of the plate 120. Left of center of the plate 146 and depending on the hollow rod 122 a piston-cylinder unit CH2. A piston rod 179 of the same carries a transverse pin 180 on the opposite one A chain 18l is attached to each end, the other ends of which are attached to the links 176. By extending the Piston rod 179 can be lifted via the chain 181, the clamping member 90 into its idle position, with springs 177 between the bearings 178 and the links 176 move the piston rod 179 upwards again and the clamping member into its working position drive back when the pressure in the piston-cylinder unit CH2 is released. The clamping member 90 lies during the punching process during a movement of the feed table 32 into its advanced Position in the working position, while with counter-rotating movement of the feed table 32 a valve, not shown, the Clamping member 90 stops in its empty position.

Stacking device

The stacking device 36 has a frame of two vertical ones Posts 182 held by brackets 138 and struts 184 attached therebetween. The posts 182 can be in sockets be moved to brackets 188 on the substructure 190 of the

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Punch are attached. A piston-cylinder unit is attached to the struts 184 CsI attached, the piston rod 192 of which carries a sprocket 194. Two horizontal arms 196 store for vertical movements in rails 182s, which are in the Post 182 are embedded. There is one on each of the I96 arms Plate 200 is provided. The plates 200 support four rollers 202, two of which are on either side of the Rails run 182s. The outriggers 196 are supported by a strut 198 held together and form the stacking table. A chain is with one end on one of the struts I98 and with the other End attached to the substructure 90 of the punch. Thus, when the punching block 38 moves upward, the frame of the stacking device becomes 56 raised, with the chain wheel 194 and the meshing chain 204 of the stacking table is raised with respect to the frame.

The upward movement of the stacking table is achieved by abutting the upper surface of a pallet P or a stack lying thereon S-cut pieces, delimited against the lower surface of the feed table 32 plate. The plate I06 is in each case their front position when the punching block 38 is raised. To be able to control the movement of the stacking table are (Fig. 9) into the lower surface of the plate IO6 flow resistance switch or sensor 206 embedded. Each of these switches 206 consists of a block 208 (FIG. 12) with one

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Inlet bore 210 and an outlet bore 212, both of which open into a chamber 214, which opens at 216 to the atmosphere is. The inlet bores 210 of the switches 206 are connected to a connector 220 via lines 218 of small diameter connected to the lower surface of the plate 106. The fitting is connected to a source of compressed air via lines 222 and 224 connected. The outlet bores 212 of the switches 206 are via lines 226 of small diameter that go through together a rigid line 228 and 230 are connected to each other. The lines 226 are connected to a turbulence intensifier TA and through it they are connected to an amplifier transformer SUT, which has a valve VsI in the pneumatic Control circuit of the stacking device 36 shaded.

Fig. 13 indicates that compressed air is flowing through the lines PsI and Ps2 the valve VsI and a manual valve Vs2 is supplied. Retired the machine does not have air flowing through either valve. On the other hand, if the top surface of a pallet P or a When the stack S of punched-out parts comes into contact with the plate 106, the openings 216 of the flow resistance switches close 206 so that an air signal is given to the turbulence intensifier TA via the outlet lines 212. This directs the signal to the amplification transformer SUT. It will the gwftobe-ncte signal to the transformer when the machine is idle disturbed. If no signal is given to the transformer SUT, it opens

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the valve VsI so that compressed air is supplied to the lines Ps3j Ps4 and a three-way valve Vs3 to the right (Fig. 12) and a valve VsU to the left (Fig. 12). As a result of this switching of valve Vs4, line Ps5, which is connected to the other side of valve Vs3, is drained. Normally the right side of the valve Vs ^ is kept open under spring pressure, so that the line Ps5 is connected to the manual valve Vs2 via a line Ps6.

By switching the valve Vs3 to the right, the pressure medium flows into the piston-cylinder unit CsI above the piston. The piston and therefore the sprocket 19 ^ on the piston rod 192 are therefore lowered. If another signal is given to the transformer SUT and no compressed air is supplied to the valve VsI the valve Vs3 assumes the position shown in FIG. 13, in which neither the one nor the other side of the piston is supplied with pressure medium.

When the stack S is full, it is removed. The stacking table can then be brought back into its uppermost lape by actuating the manual valve Vs2. Compressed air is also used the line Ps6, the valve Vs4 and the line Ps5 of therechton Page (Fig. 13) of the valve Vs3 supplied, this after toggles left. Thus, compressed air is let into the piston-cylinder unit CsI under the piston, causing the piston rod

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192 and the chain wheel 194 are raised, and the stacking table is moved upwards ^{via the chain 20 1 I.}

The flow resistance or sensor system acts so that when there is a signal from one of the switches 206 the transformer SUT receives no signal.

If the stacking table is to be lowered, a manual valve Vs7 is provided in the sensor system Turbulence intensifier TA in the same way as a signal is given via the sensors 206.

Separator

The punch arm 42 is provided with a boom consisting of four arms 232 (two of them are shown in FIG. 9), supported by supports 234. There the four arms are equal to each other, only one is described below.

The arm 232 has an inverted U shape in cross section and receives eleven hollow support members 236 therein. For each of the elements 236, a stop 238 is provided on the arm 232, which protrudes upwards and receives a pin 240 which penetrates the element 236. A screw 242 with a The countersunk head runs through an opening in the bottom of the element 236 and is screwed into the pin 240 so that the

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Element 236 is held. A compression spring 244 between arm 232 and element 236 ensure that element 236 is pushed downward. In addition, every element is v / e 236 on a guide pin 246 which extends from the arm 232 downwards protrudes and surrounded by a sleeve 248 in the element 236 is. The elements 236 are therefore fastened in the arms 232 in a vertically flexible manner and independently of one another.

The arms 232 hold a separating member 250 having a separating edge 250a (FIGS. 15 and 16), the shape of which follows the edge of a stamped Adjusts workpiece. The shape of the edge 250a also corresponds to the edge 108a of the plate 108. The link 250 is of four hooks 252 held on arms 232, i.e. H. on four elements 236.

To the plate IO8 not only with respect to the separating member 250, but also to precisely align the amount of movement of the feed table, the front and rear position of the feed table can be changed in the machine. For this purpose, the front end of the feed table are used as a slide serving flat iron pieces 124 with outwardly protruding Approaches 254 provided, on which terminals 256 to limit the Extent of movement can be attached.

During an operation of the machine, a punched-out workpiece lying on the plate 106 is pushed forward

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of the table 32 brought into a position above the stacker. Then the punching block and the stacking table are raised until the punching arm and the punching block meet, the feed table also being raised and the workpiece on it being pressed against the separating member 250, which, together with the elements 236 sweep ^{, yields the pressure of the springs 2 1} I ¹ J upwards. After a further workpiece has been punched out on the steel plate 10 ¹ I, the stamping pad is lowered geringfüfir 38, so that when the feed table is moved to its retracted position 32, the workpiece is not moved with it. When the plate IO8 is advanced, the elements 236 return to their lower position under the pressure of the spring, the punched workpiece being gradually pushed from the plate 108 onto the stack S. When the plate 108 is pulled past the separating member 250, the latter is held in its retracted lens until the plate 108 is completely pulled away from it. Then the separating member 250 is pressed downwards under the action of a spring, its edge rubbing against the edge of the plate 10B, so that there? punched workpiece is completely separated from the next piece of material (Fig. IA and 15).

Conveyor

The conveyor device 3 ¹ I (FIG. 1) has an endless conveyor belt 258 , which runs on driven rollers 260, which in

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store a sloping frame 262. Ten holding devices 262 are attached to both sides of the frame, in pairs, with each pair carrying a role R with su -3danzendem material .

The frame 2e0 wi.i * ä is carried by two pieces of 266. In addition, a roll of paper is provided, which is inserted into the punch * = together with the material to be supplied. Punching a La.ee; has as many layers as there are pollen in the holders, whereby the layer is always covered with the paper running off the roll Pb. Rails 272 are embedded in supports 266, in which an empty roller 268 held on blocks 270 can be moved vertically. The sheet of material to be punched runs around roller 268, so that unequal tensions in the individual layers are compensated for. In addition, the mass of the rollers can be overcome by lifting the roller 268 when material is being introduced into the punches. On the folding bars 130 there is a roller 27 ^ which facilitates the introduction of material into the punch. If the roller 268 is in its lowest position, a microswitch LSI 4 is switched. This switch LS1 has a normally closed contact LSl ^ a and a normally open contact LSl4b. At the beginning of an operation, the feed table 32 moves into its advanced position and pulls material from the supply rolls R, the roll 268 being raised, the switch LSI ¹ »opens and a motor M3, which drives the conveyor belt, switches off. As soon as the microswitch LS14 is closed again, the motor M3 remains

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Should the conveyor not begin to run, idler roller 268 will crash against one at the top of rails 272 Provided switch LS16 pulled, which allows the feed table 32 to return to its retracted position.

The operation of the machine is explained below:

If you want to punch with simple strokes, the operator sets a selector switch SIa, SIb, Sie to (1) (see Fig. 18). By actuating a start switch Pbh provided with two contacts Pb ¹ Ia and Pb ^ Ib, the contact Pb4a is opened, while the contact Pb4b is closed and a relay RLIa connects to a solenoid SOL3. This circuit formed by a limit switch LS3, a contact RL2b, the normally closed limit switch LSl6, the closed contact LSl ¹ Ib and another normally closed limit switch LS15 is used to move the feed table 32 into its advanced position. By energizing the relay RLl normally open contacts RLIa, RLIb are closed, so that the limit switches LSl ^ b and LS15 and also the start switch Pb4b are bypassed. The latter can then be opened. Since the limit switch LSl ¹ Jb is bypassed, the movement of the feed table cannot be interrupted if the switch is opened when the roller is raised.

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When the in-feed table is close to its advanced position has reached, a relay RL3 is temporarily energized by closing a normally open switch LSI, which two solenoids SOLlO, SOLIl shaded, which have a punching stroke counter turn on. While relay RL3 is energized, contacts RL3a and RL3b shadow from their positions shown in FIG around. The contact RL3a, the selector switch SIa and a closed switch LS5, the relay RL3 placed on a hold circuit. As well as the feed table 32 its advanced Has reached position, a switch LS2 is closed and energized a solenoid SOLI, whereby the punching block 38 is raised. A switch LS ^ is used to limit the punching block stroke from his in Pig. 18 adjusted position.

If the punching block has reached the upper limit of its movement, the closed switch LS5 opens and switches it on SOLI solenoid off. The punching block 38 thus remains. Since the relay RL3 is also switched off, the shadows Contacts RL3a and RL3b back into their position shown in FIG. The switch LS3, contact RL3a, Switch LS4 and selector switch SIb energizes solenoid S0L2, and the punching block is lowered.

After the punching block has been lowered so far that the Sheet material with the punching knife K attached to the punching arm 42 is still in frictional engagement, the limit switch switches LS3 from its position shown in Fig. 18 ^ ***,

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so that the solenoid SOL2 is switched off and the downward movement of the punching block is interrupted. In addition , a delay relay TMR is switched on in the circuit _3, which overruns the over-the-limit range. In addition, switching to -, ■ £;?. .? £ 3r2 to? Switch LS3-, £ sr via the Kent clock HLIb ₁₁ Be, ■; ren2i: r. _: ~ 2S'2hold? LSIb and liontakt ELIa gstildste electric circuit u ^ s relais IiLl and de ^ adenoids SOL3 switched off _s so that the ■■ 'u ^ ührtissh? S supüexverts in its rarOckseso-sne situation. When the cam 148 hits the valve VH1, the movement of the feed table is interrupted, since the pressure in the piston-cylinder unit CH1 is shaded; in addition, the pressure from the piston-cylinder unit CH2 is released so that the clamping member QO can clamp the material on the feed table 32 under the pressure of the springs 177. The delay relay TMR is set so that the feed table 32 returns to its starting position and the material is clamped before the punching block 3P is lowered further.

After the delay period has expired, the switch TMRl closes; this will re-energize the solenoid S0L2 and the downward movement of the punch block 38 can be terminated. The switch LS3 then switches to its position shown in FIG. The limit switch also takes LSlJ again to its position shown in Fig. 18, so that the solenoid SOL2 is shaded.

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If automatic punching is to take place, the selector switch 5 ¹ Ia, SIb, Sie is set to (2). In addition, the required number of punching strokes is set on the counter. The machine is started with the start switch Pb4.

A relay IUJ1 and a lamp LP3, which indicates that punching is taking place automatically, are switched on via the limit switch. When the relay RL ^ is energized, normally open contacts RL ² Ja and RL ¹ Jb close, whereby the relay RL ¹ J is connected to a holding circuit that bypasses the start switch via contact RL ^{1 Ja. This holding circuit remains during the automatic punching process} In addition, every time the punching block 38 is lowered,

In the limit switch LS ^ / its position shown in Fig. 18 switches over, with ^{one of the punching stroke counter actuated via the limit switch LS3, contact RL3a, contact RL 1} Ib, normally the one in Fir :. 18 and the limit switches LS16, LSl ¹ Jb and LS15, the solenoid SQL3 is energized and this initiates a new punching stroke each time.

Every time the switch LSI toggles the punch stroke counter a pulse is issued and as soon as the preselected number of pulses has been received at the counter, the switch BS10 switches off its in Fig. 18, whereby the solenoid S0L3 turns off and the punching is terminated, which is indicated by a lamp LP2 is shown.

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If the punching knife K attached to the arm 42 is to be put down, the selector switch SIa, SIb and you are set to (3). The machine then runs until the punching block 38 is in its upper position, the limit switch LS5 being opened and the relay RL3 being switched off. The contact RL3a thus switches to the position shown in FIG. 18, the relay RL2 and solenoid SOL5 being energized via the limit switch LS4 and the selector switch SIb. By energizing the solenoid SOL5, the clamping rails 62 are moved to the right or to the left, so that (FIG. 2) the punching knife K is released in that its lugs 84 slide out of the slots 82. The piston rod 74 of the piston-cylinder unit CCl, which _{drives A} clamping rails 62, closes the contact LS17a of a switch LSI7 located on the punching arm 42 when it moves. At the same time becomes a contact

an LS17b opened. In addition, switches in / switch LSlO, whereby the solenoid S0L2 is energized and the punching block 38 is lowered. When the punching knife K is released from the clamping rails 62, the switches LS6, LS7, LS8, LS9 switch to their position in FIG. 18 position shown.

When relay LR2 is energized, a normally open contact RL2a is closed and contact RL2b switches as in FIG 18 shown at. This bypasses switch LS3. The solenoid S0L2 is now via the contact RL2b, contact RL3a, Switch LS4, selector switch SIb and the switches LS17a and LSlO excited. When the contact RL2b is out of its position shown in FIG

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Position switches, the circuit in which the solenoid SOL3 is switched off, but via the contacts RL2b and RL3a, the switch LS4, and the contact PL2a another circuit educated. As soon as the punching block 38 has reached its lower position, the switch LS4 is in its Pig. 18 switches to the position shown, the circuit and the feed table 32 moved into its retracted position. The relay RL2 switches off, and the Contacts RL2a and RL2b resume their position shown.

If a punching knife K is to be attached to the punching arm 42, the Switch SIa, SIb, they are set to (4) in Fig. 18. When the punch knife K is moved against the punch arm 42, lays the back plate 44 of the knife K moves against the switches LS6, LS7, LS8 and LS9, and closes normally open contacts LS6a, LS7a, LS8a, LS9a. This energizes a solenoid SOL6, and this moves the clamping rails 62 to the left or to the right, so that the punch knife K is clamped. At the same time, closed contacts LS6b, LS7b, LS8b, LS9b open, whereby the Solenoid SOLI switches off and the upward movement of the punching block is interrupted. In this way it is avoided that the punch knife K is damaged. In addition, the switches switch LS10, LS17a, and LS17b as shown in Fig. 18 so that solenoid SOL2 is energized and the punching block 38 is lowered.

109835/0368 _0R1G1NAt

IHBQ132

The advantages achieved with the invention ran in particular in that the punching knife is automatically attached to the punching arm or can be detached from it. In addition, the invention enables Machine a punching and stacking of T -. 'Pieces, without human intervention being necessary.

KHH / AFP

1 0 9 8 3 - / 0 3 H ß

Claims (4)

16R0132 ze claims 1.] iüascnine for punching out and stacking workpieces from an endless supply of sheet material; Consists of a decal of a punching arm provided with a knife holder and a release device to move back and forth with a feed table for placing certain lengths of sheet material on the punching block and for transferring punched workpieces from the dancing block m a tape device; e η η-z eic i \ η et, oaös the punching ncoscrhalte- und / iusjösevorricJitung from the combination v / ahlwc-ise jjctütig.ijarar dieriaaöchic-nen [L ^] to the Laiton unc. Release oes / niL himon -., Ericnteten btanzmessers [K] unu ocin with respect to the Klcmrriscnie-nen [o <i] movable feed table [32], do not provide a lialtcvorrintung [ju] for;, align the Si [t \] uezü.; licrj uer Kleiumschienen, consists. ; .ascnine 'JGr ₁ Uu-S nns,; ruch 1, thereby gck ο η η- z eic ii i. s ^ c, caas in the IClemifSchianen [62] on contact i.iit oei.i punch knife [K] respondae switch [LS6, LS7, Loo, LoiiJ zuhi trigger one that btanznesoor [. ] vergeung uer Klei.imscaicmen [t> 2] vorgesel; en .sint ·. 3. machine gomäss Ansprucn 1 j UNU 2, characterized ^r i ekennzeic'nnet that responsive to contact with the punching blade [K] switch [LS6, LS7, CBM, lo9] zura interrupting the movement of the stamping pad [3EI] against aen ütanzarm [ 38] are provided. 1 0 9 8 3 S / 0 3 5 ö BATH ORIGINAL 4.] Machine according to claim 1, characterized in that the feed table [32] between a retracted and an advanced position with respect to ues ritanzklotzes [3d] is indispensable, with a delivery part [luö] of the table [32] in the retracted position between otanzariu [42] and dance block [33] and in the advanced position under a separating device [232] away from the punching tool [42], the holding device [90] holding a punched workpiece against movement with the feed table in its retracted position holds. According to claim 1 and = 1, α adurchg e-Jc e η η draws that the stacking device [36] consists of a table that extends outwards during the movement of this punching block [3 8] against the otanzarm [42] is provided with sensors [206] responding to a contact UeB upper surface uor ijfc.t.ij-.alvorrichtuny [36] with the underside of the feed disk to interrupt the upward movement of the stacking device [36]. ^fiAD Lee side