JPS6235913B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention is a squeegee device for flat stencils, comprising two squeegee strips spaced apart from each other, the squeegee strips having two spaced apart squeegee strips. , of the type in which the squeegee strips are provided with a connectable/disconnectable magnetic beam which can be pivoted together about a pivot axis located between the squeegee strips and which crimps one of the squeegee strips to the stencil. related to things.

BACKGROUND OF THE INVENTION For flat stencils, it is known to provide the squeegee with a roller-type squeegee made of magnetizable material and pressed onto the stencil by means of a magnetic beam. A squeegee is also known which includes two squeegee plates that are spaced apart from one another and are pivotable about one axis.

It is often desirable to have the squeegee press the stencil with different forces at different stages of the operation. Furthermore, it is advantageous if this crimping force is adjustable.

OBJECTS OF THE INVENTION It is therefore an object of the present invention to provide a squeegee device that allows the pressure force of the squeegee on the stencil to be varied during different working stages.

Arrangement of the Invention In order to achieve this object, the arrangement of the invention includes:
In a squeegee device of the type mentioned at the outset, one of the squeegee strips has a magnetizable material located opposite the magnetic beam;
The center of gravity of the squeegee device is located on the side of the other squeegee strip, offset from a pivot axis common to both squeegee strips.

Example Next, embodiments of the present invention will be described with reference to the drawings.

As can be seen in the drawing, the squeegee device consists of squeegee strips 12, 13 connected to each other via side shields 4, the squeegee strips 12 being made of magnetizable material, such as steel or magnetizable plastic. The stencil has a squeegee 1 connected to the stencil 2 for sliding under pressure on the stencil. Opposed to the squeegee strip 12 is a magnetic beam 3 which, in operation, attracts the magnetizable material 2 and thereby moves the squeegee 1 onto the stencil 10.
Crimp it. By the movement of the magnetic beam 3 in the direction of the arrow 14, the squeegee device is entrained and likewise moved in the direction of the arrow 14. In this case, the material (for example ink) on the stencil 10 is passed through the holes in the stencil 10 and onto the printing strip.

The squeegee strip 13 has as a weight a substance 7 of a non-magnetizable material. A pivot shaft 5 is arranged between the two squeegee strips 12, 13 so that the center of gravity of the squeegee device is located on the side of the squeegee strip 13. Therefore, if no magnetic force is present, the squeegee device is tilted about the pivot axis 5 within an angle α in the direction of the arrow 15, and the squeegee 1 is lifted by a value H. The switch for magnet beam 3 is turned on,
When the magnetizable material 2 is attracted, the squeegee device is tilted in the direction of the arrow 16, so that the squeegee 1 is brought into contact with the stencil 10 and the squeegee strip 13 is lifted out of the stencil 10 together with the material 7. To change the height of the value H, the handle 9 on the squeegee strip 13 is rotated, thereby displacing the substance 7. Printing by the squeegee device of the present invention is performed as follows. That is, first of all, the stencil 10 is placed on a printing strip that rests on a blanket 11. In this case, the squeegee device is located above the stencil 10 in one rest position. When the magnetic beam 3 is switched on, the squeegee device is brought into the position shown in FIG. 1 against the weight of the material 7. The magnetic beam 3 and the squeegee device are now moved in the direction of the arrow 14 in a manner known per se, the material lying above the stencil 10 being squeegged through the stencil 10.
After the end of the squeegee movement, the magnetic beam 3 is switched off, so that the squeegee device pivots around the pivot axis 5 in the direction of the arrow 15 based on gravity, ie on the basis of the weight of the material 7;
A substance 7 is deposited on the stencil 10. At the same time, the stencil 10 is lifted off the printing strip or blanket 11 in the direction of the arrow 17. The squeegee device and the magnetic beam 3 are now moved relative to the stencil 10 in the direction of the arrow 18 and returned again to their starting position.

In other words, the swivel of the squeegee device is effected solely by gravity or magnetic force without mechanical aids. At the same time, a high pressure bonding force is obtained at the position shown in Fig. 1, whereas the position shown in Fig.
The crimping force at the position shown in the figure is small. Furthermore, not only the switching point but also the crimping force can be easily adjusted.

In the squeegee device shown in FIG. 3, a roller type squeegee 19 is used in place of the squeegee 1 shown in FIGS. 1 and 2. This roller type squeegee 19 is made of a magnetizable material, and the stencil 10 is
be forced to. When the magnet beam 3 is turned off, the roller squeegee 1
In order to reliably lift the stencil 9 from the stencil 10, a lifting magnet 20 having a magnetic force smaller than that of the magnetic beam 3 is provided. The squeegee strip 12 has a magnetizable material 2 as in the embodiment shown in FIGS. That is, the magnet beam 3, which is not shown in FIG.
It affects both. As can be seen from the drawing, the substance 2 is in this case separated from the roller-type squeegee 19 by an insulating layer 21 . If the insulating layer 21 is not provided in this case, the substance 2 and the roller squeegee 19 will come into contact with each other.
Roller type squeegee 19 along stencil 10
rolling is no longer possible or is significantly hindered. Any magnetic insulator can be used as the insulating layer 21 between the material 2 and the roller squeegee 19, but in many cases a plastic, such as Teflon or the like, will suffice. In the embodiment of FIG. 3, when the magnet beam 3 located below the stencil 10 is switched on, the roller squeegee 19 is moved away from the lifting magnet 20 and pressed against the stencil 10, as already mentioned. At the same time, the magnetic beam 3 also acts on the material 2, so that this material 2 is pivoted about the pivot axis in the direction of the stencil 10 (see FIG. 1). In this case, the insulating layer 21 is applied to the roller type squeegee 1 as described above.
9 and substance 2 are prevented from coming into direct contact with each other. After the squeegee device has been moved in the direction of arrow 14 in FIG. 1 to squeegee the material on stencil 10 through the holes in the stencil,
When the magnetic beam 3 is switched off, the squeegee device pivots back to its starting material under the force of gravity as described for the embodiment of FIGS. 1 and 2 (see FIG. 2). In other words, the substance 2 is lifted off the stencil 10, and the roller squeegee 19 is likewise lifted off the stencil 10 by means of the lifting magnet 20.

It is also possible to provide the roller type squeegee with a special holder fixed on the squeegee strip 12 or with an axle pin supported on the side shield 4. In other words, the roller squeegee 19 may be held at both ends thereof to prevent the roller squeegee 19 from moving away from its desired position for any reason. However, in this case the movement of the roller-type squeegee 19 in a direction perpendicular to the stencil 10 must be guaranteed. For example, the side shield 4 of the squeegee device is provided with a slit extending perpendicularly to the stencil 10, and the support pins provided at both ends of the roller-type squeegee 19 can move up and down within the slit. This can be achieved by being guided by. When the magnet beam 3 is turned on, the squeegee device rotates around the pivot shaft 5, and at this time the roller-type squeegee 19 is pulled away from the lifting magnet 20 and placed on the stencil 10; Type squeegee 19 is side shield 4
guided by said slit in. In this case, the arrangement must be such that the roller-type squeegee 19 projects somewhat beyond the squeegee strip 12 when viewed in the vertical direction.

Effects of the Invention When the squeegee device is configured as in the present invention,
During one working phase the squeegee strip is attracted by the magnetic beam together with the magnetizable material, but when the magnetic beam is switched off, the squeegee device moves between the two squeegee strips based on the position of its center of gravity. Rotate around a common pivot axis. This makes it easy to press the squeegee against the stencil with different pressure forces at different working stages.

[Brief explanation of the drawing]

1 and 2 show the squeegee device according to the first embodiment, FIG. 1 shows the squeegee device in a working position where magnetic force is generated, and FIG. 2 shows the squeegee device in a working position where magnetic force is generated. FIG. 3 shows a squeegee device according to a second embodiment with a roller type squeegee. 1... Squeegee, 2... Material, 3... Magnetic beam, 4... Side shield, 5... Rotating axis, 7... Material, 9... Handle, 10... Stencil, 11... Blanket, 12 ,13...
Squeegee strips, 14, 15, 16, 17, 18
...Arrow, 19...Roller type squeegee, 20...
...Lifting magnet, 21...Insulating layer, α...Angle, H
……value.

Claims (1)

Claims: 1. A squeegee device for flat stencils, comprising two squeegee strips spaced apart from each other, the squeegee strips being positioned between the squeegee strips. one squeegee strip 12 is provided with a connectable and disconnectable magnetic beam which crimps one squeegee strip 12 to the stencil; has a magnetizable material 2 located opposite the magnet beam 3, and the center of gravity of the squeegee device is located off the axis of rotation and on the side of the other squeegee strip 13. A squeegee device for flat stencils, featuring: 2. A substance 7 made of a non-magnetizable material is provided as a weight on the other squeegee strip 13, and the position of the center of gravity of the squeegee device is variable by operating the handle 9 for moving the substance. A squeegee device according to claim 1. 3. A squeegee device according to claim 1 or 2, wherein both squeegee strips 12, 13 are each provided with means for displacement adjustment of the position of the squeegee strips. 4. A squeegee device according to any one of claims 1 to 3, wherein the magnetizable material or at least a part of the material is formed by a roller-type squeegee 19. 5 The shaft pin of the roller squeegee 19 is held by one of the squeegee strips 12, and the roller squeegee 19 is removed from the end of the squeegee strip 12.
5. The squeegee device according to claim 4, wherein the outer peripheral surface of the squeegee device is protruding. 6. Squeegee device according to claim 4, in which one of the squeegee strips 12 has a lifting magnet 20 for a roller-type squeegee 19.