DE8008030U1 - PUNCHING FOR SURFACE AREA, ESPECIALLY FOR SKIN AND SKIN, WITH UNIFORM PRINTING ON THE WHOLE PUNCHING SURFACE - Google Patents

Description

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Applicant: SITPA S.P.A.

GAMBOLO «(PV), Italy

"Punch for tarpaulin structures, especially for skins and Pelle, with even pressure on the entire Stanjz area"

DESCRIPTION.

The present innovation relates to a punch for tarpaulin structures, in particular for hides and skins, the per se known type, which comprises a stationary lower track intended to support the item to be punched, over which "a suitably designed punch knife is provided, and an upper pressure head, which a pair of

arranged hydraulic cylinder controls if required * to approach the punching knife underneath and to unite with it in order to carry out the desired operation of punching.

With the punching of this type there is the problem of the punching pressure on the entire extension of the pressure head to be compared and so that otherwise caused by a possible different behavior of the two cylinders Fix imbalance as it can happen even if the two cylinders are uniform and at the same time be fed.

At present there are mostly solutions to solve this problem that strive to make the behavior of the two cylinders more uniform from the hydraulic point of view, by throttling the supply of the more active cylinder and the supply of the less active cylinder The result is, however, that the punching pressure, although uniform, is reduced in relation to the maximum value otherwise available from the more active cylinder.

The purpose of the present innovation, however, is this To solve the problem in such a way that the highest of the possibly more active cylinder of the entire contact surface can be reached Pressure will be secured.

According to the innovation, this purpose is achieved in that the two ends of the pressure head, which affect the hydraulic cylinder, with corresponding ones Ends of a torsion bar are kinematically connected.

The torsion bar obviously allows one of the end de of the pressure head to the other the highest one end of the base head of a possibly more active cylinder to transmit the given thrust and thus to compare the thrust, hence the punching pressure at the maximum value to be evened out over the entire extension of the pressure head.

A punch according to the innovation is of greater clarity but for the sake of purely by way of example in a non-limiting sense shown in the accompanying drawings, as follows:

FIG. 1 shows the external structure of the punch in a perspective view;

FIG. 2 shows the same punch in axial section;

FIG. 3 shows the said punch in cross section along the section line III - III of FIG. 2. ^s

The punch shown in the drawings comprises a stationary lower web 1 which is supported by the floor box 2 rigidly vefbun with it and is intended to support a sheet 3 of material to be punched, over which a punching knife k of suitable design is arranged.

In an elevated position with respect to the stationary web 1, at a suitably selected distance, a pressure head 5 is arranged, which is laterally supported at both ends by a pair of slidable columns 6, one below the other

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and helps the moving parts of the two δ! dynamic Cylinders 7 are rigidly connected by a cross bar 8.

Via a pair of push rods ° i hinged to the two ends of said beam 8 /, said beam 8 is kinematically connected to just as many pairs of brackets IO, which are rigidly connected to the ends of a torsion bar 11, which in turn is eccentric in 12 to stationary Camp 13 is bound _o

In FIGS. 1, 2 and 3 the punch is shown in the rest position, "with a wide space left between the stationary track 1 and the movable head 5 for the introduction of the item to be punched and the punching knife. In order to carry out the punching, both cylinders 7 are controlled to lengthen themselves in such a way that they cause the two columns 6 and consequently the pressure head 5 to be lowered via the crossbeam 8 until they come into contact with the punching knife h . During this operation, the torsion bar 11 ensures that the entire extension of the head 5 is exposed to the highest pressure available from the single and / or the other cylinder 7.

Claims (1)

Protection claim Punch for flat structures, in particular for hides and skins, with a stationary lower track and a pressure head, which is controllable by two hydraulic cylinders acting on its lateral ends, characterized in that the pressure head (5) is supported by columns (6), the ends of which each have a push rod (9) with at the ends of a Torsion bar (11) attached brackets (1Q) are connected, and that the torsion bar (11) eccentrically in place fixed bearings (13) is mounted. t (089) 988272 988273 988274 983310 Vl / Sc Telegrams: BERGSTAPFPATENT Munich . ".: 0} 2» 5KtBJEKGd Bank accounts: Hypo-Bank Manchen 4410122850 (BLZ 70020011) SwiR Code: HYPO DE MM Bayec Veieinsbank Munich 453100 (BLZ 70020270) Post check Munich 65343-808 (BLZ 70010080)