WO1979000939A1 - A device for stretching and fixing a cloth on a frame - Google Patents

A device for stretching and fixing a cloth on a frame Download PDF

Info

Publication number
WO1979000939A1
WO1979000939A1 PCT/SE1979/000090 SE7900090W WO7900939A1 WO 1979000939 A1 WO1979000939 A1 WO 1979000939A1 SE 7900090 W SE7900090 W SE 7900090W WO 7900939 A1 WO7900939 A1 WO 7900939A1
Authority
WO
WIPO (PCT)
Prior art keywords
stand
border
cloth
frame
pressure plate
Prior art date
Application number
PCT/SE1979/000090
Other languages
French (fr)
Inventor
G Wadstein
Original Assignee
G Wadstein
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by G Wadstein filed Critical G Wadstein
Priority to DE19792947095 priority Critical patent/DE2947095A1/en
Publication of WO1979000939A1 publication Critical patent/WO1979000939A1/en
Priority to DK523479A priority patent/DK523479A/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/14—Details
    • B41F15/34—Screens, Frames; Holders therefor
    • B41F15/36—Screens, Frames; Holders therefor flat

Definitions

  • the present invention refers to a device for stretching and fixing a cloth such as a screen-, strainer-, bolting-, filter cloth or similar on a frame of the kind comprising a frame-shaped stand, a pressure plate being movable in the border of the stand and extendingover an essential part of said border and at least one member acting upon the pressure plate for displacing the pressure plate towards the cloth.
  • the purpose of the present invention is to provide a device, which facilitates the procedure of stretching and fixing the cloth and which by simple means and at a reasonable price gives a perfect result. It is ah important condition that the pressure plate can be adapted also to irregularly mounted cloths.
  • the frame-shaped stand is provided with a bottom
  • said member comprises at least one pad inflatable with a fluid and arranged between the bottom of the stand and the pressure plate, which is so much smaller than the border of the stand that the pressure plate is adjustable in different angles in relation to the bottom and that on the upper edge of the border of the stand a clamping device is attachable for clamping the cloth on all sides against the border, said clamping device comprising a frame, which by means of tightening means can be pressed against the stand.
  • Figure 1 is a plane view of the device according to the invention.
  • Figure 2 is a section according to the line II - II in figure 1.
  • the stretching and fixing device comprises a box-shaped stand 11 comprising a rectangular border 12, a perforated bottom plate 13 and an underframe 14.
  • a clamping device 16 can by means of tightening means 15 be pressed against the upper edge of the border 12, which is made by square tubes.
  • the clamping device 16 comprises a frame of substan- tially the same size as the border 12, said frame also being made by square tubes. At the pressure surfaces of the clamping device 14 and the border 12 facing and cooperating with each other a friction lining 17 and an elastic pressure lining resp. or vice versa are attached.
  • an expandable member 19 which according to the embodiment shown comprises a pneumatic pad of a plastic or rubber material.
  • the inflation and the discharge of air can be made by way of a flexible tube 20 connected with a pressure gauge 21 and a stop valve 22.
  • a pressure plate 23 rests against the pad 19, said pressure plate extending over a substantial part of the free space between the side edges of the border 12.
  • the cloth is stretched and fixed in the following way.
  • a frame 24. over which a cloth 25 is to be stretched is placed substantially in the middle of the pressure plate 23 and the cloth 25 is uncoiled from a supply roller 26 and is widened over the frame 24 and over the edge of the border 12.
  • the clamping device 16 is removed and the air is evacuated from the pad 19.
  • the clamping device is placed on the cloth 25 just opposite the upper edge of the border and the tightening means 15 are tightened, so that the clamping device 16 is pressed against the border and an effective fixing of the cloth 25 is achieved.
  • the pad 19 is inflated to an appropriate pressure, which can be read on the pressure gauge 21.
  • the pad 19 is expanded the pressure plate 23 with the frame 24 will be pressed against the fixed cloth 25 and if this is irregularly fixed the pad will compensate such irregularities, so that an absolute regular stretching is achieved.
  • the tightening means 15 of the clamping device 16 can be of another type, e.g. pneumatically or hydraulically operated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Sewing Machines And Sewing (AREA)

Abstract

A device for stretching and fixing a cloth (25) on a frame comprises a stand (11) with a rectangular border (12), a bottom (13) and an underframe (14). On the bottom an inflatable pad (19) is arranged, against which a pressure plate (23) rests. The pressure plate is somewhat smaller than the border (12) of the stand and is moveable in relation to that and adjustable into different angles relative to the bottom (13). A clamping device (16) can be placed above the border (12) and is by tightening means (15) pressed against the stand (11), thereby clamping the cloth (25) against the border.

Description

A DEVICE FOR STRETCHING AND FIXING A CLOTH ON A FRAME
Background of the invention
The present invention refers to a device for stretching and fixing a cloth such as a screen-, strainer-, bolting-, filter cloth or similar on a frame of the kind comprising a frame-shaped stand, a pressure plate being movable in the border of the stand and extendingover an essential part of said border and at least one member acting upon the pressure plate for displacing the pressure plate towards the cloth.
When mounting cloths of the above mentioned kind it is important that the cloth is stretched regularly over the whole surface area. For small frames the stretching and fixing have been made manually and inevitable irregularities following such a manual operation had to be tolerated. For large frames including several square metres pneumatic frame stretching devices have been used, which by means of a great number of pneumatic stretching means stretches the cloth until the sufficient stretching force is obtained. With these machines a good result is obtained, but the fixing of a great number of stretching means is difficult and very time-requiring. Moreover such machines are very expensive and requires a large space.
An example of such a device is described in the Swiss patent specification 402.790.
In the German Auslegeschrift 2 . 020 . 958 is described a device of the kind mentioned in the introduction, which however has certain drawbacks. Thus the pressure plate can be displaced only perpendicular to the guides in the frame. By reason of that the pressure plate cannot compensate possible irregularities of the stretching of the cloth against the frame.
In the US patent specification 1.778.385 a device for stretching a skin against a stencil is described, at which pneumatic pads are used. The purpose is to make the stencil lie tightly against the skin, thus avoiding that the dye or other colouring material used is running underneath the stencil. This device is accordingly intended for a quite different pur pose and for a different technical field than the device according to the invention.
Description of the invention
The purpose of the present invention is to provide a device, which facilitates the procedure of stretching and fixing the cloth and which by simple means and at a reasonable price gives a perfect result. It is ah important condition that the pressure plate can be adapted also to irregularly mounted cloths.
This has according to the invention been achieved by the fact that the frame-shaped stand is provided with a bottom, that said member comprises at least one pad inflatable with a fluid and arranged between the bottom of the stand and the pressure plate, which is so much smaller than the border of the stand that the pressure plate is adjustable in different angles in relation to the bottom and that on the upper edge of the border of the stand a clamping device is attachable for clamping the cloth on all sides against the border, said clamping device comprising a frame, which by means of tightening means can be pressed against the stand.
Description of the drawings
The invention will now be further described with reference to an embodiment shown in the accompanying drawing.
Figure 1 is a plane view of the device according to the invention, and
Figure 2 is a section according to the line II - II in figure 1.
Description of an embodiment
The stretching and fixing device according to the invention comprises a box-shaped stand 11 comprising a rectangular border 12, a perforated bottom plate 13 and an underframe 14. A clamping device 16 can by means of tightening means 15 be pressed against the upper edge of the border 12, which is made by square tubes.
The clamping device 16 comprises a frame of substan- tially the same size as the border 12, said frame also being made by square tubes. At the pressure surfaces of the clamping device 14 and the border 12 facing and cooperating with each other a friction lining 17 and an elastic pressure lining resp. or vice versa are attached.
On the perforated bottom 13 of the stand 11 an expandable member 19 is placed, which according to the embodiment shown comprises a pneumatic pad of a plastic or rubber material. The inflation and the discharge of air can be made by way of a flexible tube 20 connected with a pressure gauge 21 and a stop valve 22. A pressure plate 23 rests against the pad 19, said pressure plate extending over a substantial part of the free space between the side edges of the border 12.
The cloth is stretched and fixed in the following way. A frame 24. over which a cloth 25 is to be stretched is placed substantially in the middle of the pressure plate 23 and the cloth 25 is uncoiled from a supply roller 26 and is widened over the frame 24 and over the edge of the border 12. At this initial working moment the clamping device 16 is removed and the air is evacuated from the pad 19. After having placed the cloth over the frame 24 and the border 12 of the stand the clamping device is placed on the cloth 25 just opposite the upper edge of the border and the tightening means 15 are tightened, so that the clamping device 16 is pressed against the border and an effective fixing of the cloth 25 is achieved. Then the pad 19 is inflated to an appropriate pressure, which can be read on the pressure gauge 21. When the pad 19 is expanded the pressure plate 23 with the frame 24 will be pressed against the fixed cloth 25 and if this is irregularly fixed the pad will compensate such irregularities, so that an absolute regular stretching is achieved.
At very large stretching and fixing devices several pneumatic pads could be used, or the pad could be divided into a number of sections communicating with each other.
The invention is not limited to the embodiment described above and shown in the drawing, but a number of variations are possible within the scope of the claims. Thus the tightening means 15 of the clamping device 16 can be of another type, e.g. pneumatically or hydraulically operated.

Claims

C L A I M S
1. A device for stretching and fixing a cloth such as a screen-, strainer-, bolting-, filter cloth or similar on a frame of the kind comprising a frame- shaped stand (11), a pressure plate (23) being moveable in the border (12) of the stand and extending over an essential part of said border and at least one member (19) acting upon the pressure plate for displacing the pressure plate towards the cloth, c h a r a c t e r i z e d i n, that the frame-shaped stand (11) is provided with a bottom (13), that said member(19) comprises at least one pad inflatable with a fluid and arranged between the bottom (13) of the stand and the pressure plate (23), which is so much smaller than the border (12) of the stand that the pressure plate is adjustable in different angles in relation to the bottom (13) and that on the upper edge of the border (12) of the stand (11) a clamping device is attachable for clamping the cloth (25) on all sides against the border, said clamping device (16) com prising a frame, which by means of tightening means (15) can be pressed against the stand (11).
2. A device according to claim 1, c h a r a c t e r i z e d i n, that the pressure surfaces of the clamping device (16) and the stand (11) cooperating with each other are provided with a friction lining (17) and an elastic pressure lining (18) resp.
3. A device according to claim 1 or 2, c h a r a ct e r i z e d i n, that said member (19) comprises a pad, which is inflated by pressure air, and being made of a plastic or rubber material, said pad being divided into a number of compartments communicating with each other.
PCT/SE1979/000090 1978-04-18 1979-04-12 A device for stretching and fixing a cloth on a frame WO1979000939A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19792947095 DE2947095A1 (en) 1978-04-18 1979-04-12 A DEVICE FOR STRETCHING AND FIXING A CLOTH ON A FRAME
DK523479A DK523479A (en) 1978-04-18 1979-12-10 DEVICE FOR CLOSING A FABRIC ON A FRAME

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE7804347A SE409674B (en) 1978-04-18 1978-04-18 DEVICE FOR TIGHTENING A CLOTH ON A FRAME
SE7804347 1978-04-18

Publications (1)

Publication Number Publication Date
WO1979000939A1 true WO1979000939A1 (en) 1979-11-15

Family

ID=20334642

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1979/000090 WO1979000939A1 (en) 1978-04-18 1979-04-12 A device for stretching and fixing a cloth on a frame

Country Status (8)

Country Link
EP (1) EP0015950B1 (en)
JP (1) JPS55500238A (en)
CH (1) CH642304A5 (en)
DK (1) DK523479A (en)
GB (1) GB2036118B (en)
IT (1) IT1116028B (en)
SE (1) SE409674B (en)
WO (1) WO1979000939A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0132305A1 (en) * 1983-06-23 1985-01-30 Maxwell W. Stokes Advertising Pty. Ltd. Tension device

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1778385A (en) * 1930-02-17 1930-10-14 Griess Pfleger Tanning Company Leather-working machine
CH280446A (en) * 1950-02-20 1952-01-31 Luescher Geb Device for stretching gauze on printing stencil frames, in particular for textile printing.
DE892582C (en) * 1951-12-20 1953-10-08 Ludwig Freiherr Von Holzschuhe Screen printing frame
DE1083218B (en) * 1957-05-23 1960-06-15 Artos Maschb Dr Ing Meier Wind Device for stretching metal or other fabrics on rigid frames, in particular film printing stencil frames
CH402790A (en) * 1963-09-23 1965-11-30 Luescher Ag Geb Device for stretching gauze on printing stencil frames
US3391635A (en) * 1966-12-12 1968-07-09 M & M Res Engineering Inc Screen stretcher for printing apparatus
US3608482A (en) * 1969-10-31 1971-09-28 American Screen Process Equip Locking bar for screen-printing frame
DE2202095B1 (en) * 1972-01-18 1973-07-05 Vaillant Joh Kg Circulation water heater

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1778385A (en) * 1930-02-17 1930-10-14 Griess Pfleger Tanning Company Leather-working machine
CH280446A (en) * 1950-02-20 1952-01-31 Luescher Geb Device for stretching gauze on printing stencil frames, in particular for textile printing.
DE892582C (en) * 1951-12-20 1953-10-08 Ludwig Freiherr Von Holzschuhe Screen printing frame
DE1083218B (en) * 1957-05-23 1960-06-15 Artos Maschb Dr Ing Meier Wind Device for stretching metal or other fabrics on rigid frames, in particular film printing stencil frames
CH402790A (en) * 1963-09-23 1965-11-30 Luescher Ag Geb Device for stretching gauze on printing stencil frames
US3391635A (en) * 1966-12-12 1968-07-09 M & M Res Engineering Inc Screen stretcher for printing apparatus
US3608482A (en) * 1969-10-31 1971-09-28 American Screen Process Equip Locking bar for screen-printing frame
DE2202095B1 (en) * 1972-01-18 1973-07-05 Vaillant Joh Kg Circulation water heater

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0132305A1 (en) * 1983-06-23 1985-01-30 Maxwell W. Stokes Advertising Pty. Ltd. Tension device

Also Published As

Publication number Publication date
JPS55500238A (en) 1980-04-24
IT7948771A0 (en) 1979-04-18
GB2036118A (en) 1980-06-25
GB2036118B (en) 1982-11-17
CH642304A5 (en) 1984-04-13
EP0015950B1 (en) 1982-06-16
SE409674B (en) 1979-09-03
IT1116028B (en) 1986-02-10
EP0015950A1 (en) 1980-10-01
DK523479A (en) 1979-12-10

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