DE1232698B - Punching machine, perforating machine or the like. - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Ci .:

C14b

German KL: 28 b-11/01

Number: 1232 698
File number: U 3979 VII a / 28 b

Filing date: June 21, 1956

Opened on: January 19, 1967

The invention relates to a punching machine, perforating machine or the like with a work surface own, electrically conductive workpiece carrier provided with an underlay and a pressed part, perform a relative movement to each other to a tool, for example a punch, through a to press the workpiece lying on the workpiece carrier, the punching arm by an electrical Control containing gear is operated by the impact of the tool on the Electrically conductive workpiece carrier surface for ending the relative movement of the pressed part and the workpiece carrier is switched towards each other and to move these parts apart.

Such a machine is intended to enable a workpiece to be completely, i.e. H. along its entire cutting surface, is penetrated without due to incomplete penetration of the Punching knife through the workpiece a return movement of the machine punching stroke prematurely, i.e. ao before the workpiece is completely punched through. Furthermore, the field of work of this The machine should not be limited to non-conductive stamping materials, but the machine should also be for punching or perforating electrically conductive workpieces, e.g. B. of sheet metal, are suitable.

It is known to control the punching stroke of a punching machine via an electrical circuit. This well-known The machine has a workpiece carrier in the form of a punching block with an electrically conductive surface and a hydraulic transmission for moving the punch arm with respect to the workpiece carrier, and although under the control of a circuit that includes the workpiece carrier. After the punch arm If a punching knife has driven through the material to be punched on the workpiece carrier, the heated one becomes the heated one Circuit closed over the punch knife. The hydraulic punch arm gear is with a solenoid valve provided, the position of which determines the punch arm movement direction. The solenoid is powered by the Circuit energized. The extent of the punch arm stroke is controlled so that after the punch is driven through the workpiece, the punch arm is moved back on the punch block. Thus regulates itself in the machine the punch arm stroke independent of both the thickness of the workpiece and the Height of the punching knife. It is true that this punching machine does and will do a fast and good job the punching dies and the punching block used are less stressed than in conventional, mechanical ones controlled punching, so that their service life increases, namely because the punch knife because of Punching machine, perforating machine or the like.

Applicant:

United Shoe Machinery Corporation,

Flemington, N.L, and Boston, Mass. (V. St. A.)

Representative:

Dr.-Ing. H. Fincke, Dipl.-Ing. H. Bohr
and Dipl.-Ing. S. Staeger, patent attorneys,
Munich 5, Müllerstr. 31

Named as inventor:
Joseph William Pokorski,
Lynnfield Center, Mass. (V. St. A.)

Claimed priority:

V. St. v. America July 26, 1955 (524 516)

of the automatically controlled punching stroke does not penetrate as deeply into the punching block as it does in mechanically controlled ones Punching is the case. However, these machines do not allow electrically conductive workpieces, for example Sheet metal to punch. In addition, they have the disadvantage that if the separation is incomplete of a workpiece because of a punch knife that has penetrated incompletely through the workpiece The punching stroke with the punching knife cannot be repeated in the same position. It must therefore be at the Punching electrically conductive workpieces or in the event of a possibly necessary repetition of the punching Delay elements are set in the control of the machine, which is of course disadvantageous.

The invention is therefore based on the object of also providing a punching or perforating machine for punching of electrically conductive workpieces.

This object is achieved according to the invention in that the underlay is on the workpiece carrier is a dielectric layer to be penetrated by the punch on each working stroke, which is on the electrically conductive surface of the workpiece carrier is attached and the punching iron from this electrically conductive Surface isolated. As is known per se, the dielectric layer consists of a fiber material and, according to a further feature of the invention, consists of at least two pressure-sensitive

609 758/73

Claims (1)

lichen adhesive-connected lamellae made of tough, which are torn off, embedded in the adhesive fibrous fabric. and the cutting property of layer 14 An embodiment of the invention is in the improvements. Drawings shown. It advantageously shows the layer 14 or 14 ' 1 is a side view of the die cutting machine, partly through a pressure sensitive adhesive layer 28 wise in section, and also part of the hydraulically connected to the electrically conductive surface 12 lischen transmission of the machine as well as an electrical den. Here, too, the ones just mentioned appear Control for the gearbox, advantages. Furthermore, when applying this Fig. 2 shows a fraction of the job, partially pressure-sensitive adhesive with wear of the in section and on an enlarged scale, ίο layer 14 or 14 'a peeling off of the same for the purpose F i g. 3 relieved a fraction of a workpiece carrier after renewal. Another embodiment, enlarged. Suitable adhesives can be used on a rubber scale, and basic adhesives, you can use any Fig. 4 is a vertical sectional view in enlarged but also water-soluble, pressure-sensitive adhesive system scale, according to the line IV-IV of Fig. 3. 15 substances such. B. Polyvinylrnethyläther use. The present machine has a workpiece such adhesives exert the desired strong adhesive carrier, the one with an electrically conductive upper effect and have the additional advantage of being Surface 12 provided workpiece plate 10 and of which is glued to the electrically conductive surface of the workpiece * a dielectric carrier attached to the surface 12 using what layer 14 is. The surface 12 can consist of a plate 102 (FIG. 2) made of soft metal or the like to soften the adhesive quickly. can be constantly removed. On this Oberfläehi A punched material 16, the z. B. leather, cloth, paper, possibly remaining adhesive parts of a metal foil or the like. Is on the surface can be easily removed by washing,
or the cut 14 of the workpiece carrier is placed. The lamellae 24 (FIGS. 3 and 4) consist of crepe paper, approximately 0.25 mm thick, for punching workpieces out of the material to be punched. The adhesive, is a punch 18, which as desired on the layer 26 is approximately 0.125 mm thick and consists of punched material 16 can be moved from a polyvinyl methyl ether. The adhesive layer 28 is pressed part or punch arm 20 through the material to be punched 16 and also approximately 0.125 mm thick. The dielectric layer 14 has been pressed firmly until it is made to engage thousands of cuts in the layered panel surface 12. The punch arm 3 ° can be formed before it is replaced. ^: 20 is mounted on a vertical support post 22 in a punching arm and the electrical control for the counter-bearing. Because the upward and downward movement of the wake is known per se, it is not at least 22 that the desired punching stroke is described to the arm 20 in detail. To understand their Wirbimg -H granted. 35 only the following is given: At the bottom Ae $ The workpiece carrier layer 14 is completely connected to the post 22 is a fully electrically conductive surface 12 movable in a cylinder 32, so that the piston 30 (FIG. 1) is attached. The cylinder is connected to the fractions 15 of this layer which are connected to a valve housing 38 during the upper and lower end of the punching process when cutting through the layer. That. Above by means of the punching iron from the remaining layer parts 40 and the lower end of the housing is separated by lines "4 * ^", they do not become detached and the layer 42 and 42 combine with a pressure fluid supply 44 - '* always a relatively flat and underneath, and the middle one Part of the housing is formed with a broken plane. This layer 14 can be provided with drainage line 46. In the valve housing there is a slide valve 48 of various types of solid, dielectric, punched, which consist of materials that can be penetrated by iron. Electronically controlled solenoid 60 can be actuated for this purpose foil or plate. Solenoid 60 is energized by indenting shaped fibrous materials such as solid papers and various of a contact button 100 to use a downward "plate-shaped plastic material. To bring about movement of the punching arm, the layer 14 can also consist of a top layer adhering to the surface of the contact button 100 in a circuit 12, which is in liquid 50, which is applied when the punching iron hits the work or molten form. Such piece support surface 12 is closed in order to initiate an on-top layer consisting of natural or artificial upward movement of the punching arm,
rubber solutions, such as rubber adhesives, varnish, shell ^ ₁₁ * ..,
varnish and resins. Patent claims: In Fig. 3 and 4, a layer 14 'is shown, the 55 1st punching machine, perforating machine or the like. by several, for example two, slats 24 from with one having a work surface with strong, sturdy paper is formed, the lamella being provided with an undercoat, electrically conductive len through a pressure-sensitive adhesive layer 26 workpiece carrier and a pressing part, the one are connected to each other. Perform a pressure-sensitive movement relative to one another in order to achieve a Adhesive prevents or reduces the crumbling 60 tool, for example a punch of lamellar parts in such places where punching strokes a workpiece lying on the workpiece carrier close one after the other and thereby gives the work to press, with the punching arm through a Piece layer has a significantly longer service life than gearboxes containing electrical controls usually when using a single layer, which is effected by the impact of the work layer the case is. In addition, the Druckemp- 65 brings tools to the electrically conductive workpiece carrier Adhesive 26 has the additional advantage of having a flat surface to end the relative movement of the that when punching leather z. B. fibers 27, the pressed part and the workpiece carrier on each other through the punch from the cut edges of the Le- to and to move these parts apart g © -