Device for holding tensioned sheet-like material and process for

Details Device for holding tensioned sheet-like material and process for Device for holding tensioned sheet-like material and process for

1995-12-27

1998-08-18

Yan, Ren

Printing

Stenciling

Stencils

101129, 3810291, B05C 1706

Patent

active

057945284

DESCRIPTION:

BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS

This application is a national phase application corresponding to PCT/DE94/00722 filed 24 Jun. 1994 and based in turn on Swiss national application 1947/93-7 filed 29 Jun. 1993.


FIELD OF THE INVENTION

The invention relates to a device for holding tensioned and sheet-like material, particularly fabric, in a stretching frame wherein, in each of the limbs of the frame a groove, running along the longitudinal direction of each frame section, is provided in the surface adjacent to the sheet-like material, whereby holding means can be inserted in the groove which maintain the sheet-like material in a stressed state.
Stretching frames are used especially in the screen printing field for supporting the fabric printing screen. The stretching of this fabric must be done to a preselected tension and must be very even.
A known solution for meeting these requirements consists in stretching the fabric by means of a known stretching device over a stretching frame, the fabric being then glued to the same in its stressed state and subsequently dried. After that the stretch frame with the stressed fabric is removed from the stretching device. This method has the disadvantage that when the stretching frame has to be reused, the glued-on fabric has to be removed, after which the stretching frame must be cleaned, this being done with corresponding solvents, which requires proper waste disposal. Further not all fabrics used for screen printing processes are suitable for gluing. This is the case especially for fabrics which have been treated prior to stretching, for instance fabrics which have been coated.
In the DE-A-32 39 319 a clamping device for screen printing frames is shown. The sections forming the frame are provided at their surface with a continuously running groove, into which a concavely shaped, band-like clamping body can be pressed, whereby the fabric is pressed into the groove together with the clamping body. With this system it is hard to achieve an even tensioning with the required stressing force, particularly also because a tensioning once the clamping body has been inserted, with the inserted clamping body is not possible. The clamping body serves rather for holding the fabric in place.
From U.S. Pat. No. 3,553,862 a stretch frame is known, which has adjustable sections. These adjustable sections are provided with a longitudinal groove, into which the fabric to be stretched is introduced and in which the fabric is clamped in place with one or two bars. These bars are made of an elastic material, whose deformation causes the pressure force exerted on the fabric. After the fabric has been clamped in place, the required stressing force can be produced by displacing the corresponding sections within the frame. With this frame it is possible to produce an even stretching of the fabric. The fastening to the frame can be done without adhesives. However due to the stressing possibility within the stretch frame this stretch frame becomes very difficult and expensive to produce.


OBJECT OF THE INVENTION

It is the object of the present invention to provide a stretch frame on which a fabric can be evenly stretched, on which the fabric is held with simple means and whose production is simple and inexpensive.
The device for holding a tensioned and sheet-like material, particularly fabrics, comprises sections forming a stretching frame, wherein in each running along the longitudinal direction of each of the sections is provided in the surface adjoining the sheet-like material, and in the groove holding means which maintain the sheet-like material in a stressed state can be inserted. According to the invention the holding means consist of rigid bars with a basically round cross section acting in pairs, which extend at least over a segment of the length of the groove, in its stretched state the sheet-like material runs around the first bar which in the groove rests against a projection, a region of the surface of the first bar and a region of the groove form a channel with a wedge

REFERENCES:
patent: 3553862 (1971-01-01), Hamu
patent: 3908293 (1975-09-01), Newman
patent: 3962805 (1976-06-01), Hamu
patent: 4539734 (1985-09-01), Messerschmitt
patent: 5097761 (1992-03-01), Hamu
patent: 5271171 (1993-12-01), Smith
patent: 5555653 (1996-09-01), Morgan

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