DE1522782A1 - Copy machine for transferring originals onto plates using the photocopying process - Google Patents

Description

",. Patent attorney, .-, .-

Dipl.-Ing. Walter Jackisch '' ■ ·· * ■ '·· Stuttgart N. Menzelstrasse 40 - " :

Sep 9 1969

G. Matthaea A 28 272

Copy machine for transferring originals on plates in the photocopying process

The invention relates to an automatic copying machine for transferring originals to plates in the photocopying process · The machine is used in particular for the manufacture of printed electrical circuits as well as for the manufacture of plates and Signs, e.g. advertising signs, of all kinds.

The photocopying process has several advantages over other copying and printing processes greater fineness of the reproduction of the drawing to be copied, adherence to narrow tolerances, lower costs the stencil, which only consists of a negative of the drawing consists. The major disadvantage of this procedure was so far in the high expenditure of manual labor, in the wear and tear of photosensitive material, as well as the impossibility of to produce larger quantities economically. the The operations required for photocopying are as follows:

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1) cleaning the panels to be treated;

2) coating with a photosensitive varnish;

3) drying;

4) cooling down;

5) exposing the sensitized plates to ultraviolet light through a negative;

6) developing, i.e. dissolving the lacquer where it was not exposed;

7) post-development;

8) Coloring to make the drawing visible for possibly corrections;

9) washing and drying.

To solve the problem of automatic manufacturing of printed circuit boards in the photocopying process, the machine according to the invention consists of a Karuaaell with radial support arms for the plates and with around the rotating column of the carousel, processing stations arranged below the radial support arms, wherein the carousel with the support arms in each case by the distance is rotated between the stations and the support arms on the rotating column can be moved up and down. The most important problem here is that the plates for the exposure with the greatest accuracy be aligned with the negative. For this purpose, there are specially designed suspension devices on the support arms Centering devices are provided for the plates to be exposed and in the exposure chambers, which always ensures the same exact position in relation to the negative for all plates to be exposed is. Another important problem is the coating of the plates to be exposed with the

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photosensitive paint. This is expensive. It is also required that the paint layer be uniform is applied to the area to be exposed. The coating station of the invention Machine also solves this problem.

An exemplary embodiment of the machine according to the invention is shown in the drawings. Show it

Pig. 1 the machine in plan view,

FIG. 2 shows the section along the line A-A of FIG. 1,

Fig. 3 the suspension device for the to be exposed Plates on the support arms,

Fig. A the centering device in the exposure chamber.

The machine essentially consists of the rotating column C. with radial support arms and the workstations 1 to 12 underneath Consider the number of radial arms B and the number of work stations 1 to 12 as an example. Im shown Examples are the following workstations:

1 Remove the plates with the copy image

2 Insertion of the plates to be exposed

3 Cleaning the plates to be exposed

4 tub for coating the panels with photosensitive paint

5 drying with ultraviolet rays

6 cooling

7 first exposure chamber for exposing one side of the plate

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ORIGINAL iHSPEGTED

8 second exposure chamber for exposing the other side of the plate

9 development chamber

10 staining chamber

11 Wash the panels

12 drying the plates.

The Pig. 2 and 3 show the suspension device for the plates on the radial transport arms B with a centering device on the support arms and on the tray below. The suspension device consists of a plate 13 'which ^{is suspended on the radial arm by means of two lateral springs 14, 14 f} and a central pin 15 * so that its position can be adjusted vertically by means of the micrometer screw 17 and horizontally by means of the micrometer screw 18. The plate 13 can be rotated about a pin 16 and it also has two lateral support surfaces 19 '19' which work together with corresponding support planes 2o, 2o 'on the chambers below. By means of this suspension device and support device, the exact position of the plates L to be exposed in the chambers is ensured, which is particularly important for the exposure chambers 7 and 8 and for the coating chamber 4.

The plates I are on the plate 13 by means of a ledge 21 suspended with hooks 22 »where the bar 21 of. can be inserted on the outside and withdrawn to the outside. When inserting and removing the plates, the worker can therefore outside the circle described by arms B.

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stand. The coating station 4 includes _a nne of the W 4 a container and a pump to pump the paint out of the container into the tub. 4 From the tub 4, the paint runs back into the container via an adjustable valve (not shown). The plates are immersed in the tub filled with photoresist and after they have been completely immersed, the adjustable valve is opened, through which the lacquer flows into the container underneath, leaving a thin layer on the plate due to the surface tension of the liquid and pulling off all drops. The adjustable valve ensures that the paint initially flows off faster and then increasingly slower, so that the layer that collects in the lower part of the plate is better pulled off and thus the smoothness of the layer is guaranteed over the entire plate.

When flowing off, the paint runs through the filter, so that Any foreign bodies from the immersed plate are removed so that the paint remains clean. After the plate has left the immersion station, the paint is pumped back into the tub by the pump. A maintenance system and an overflow device ensure that an exact paint level is maintained.

In a further embodiment of the invention is in the exposure chambers 7 and 8 a further centering device for the plates and a pressing device of the to exposing plates provided on the lying support plates; this device is shown in FIG. The negative 24 of the transferring drawing

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is attached to a glass plate 31. A flexible wall 23 (for example made of rubber) is attached to a frame 26. At _Ra hmen 26 are centering pins. A connection for a vacuum pump and a connection for a vacuum meter 29 are attached to the flexible wall 23. With a starter switch for the vacuum pump is designated, 28 are the exposure lamps. Hit 3o is the plate to be exposed, which is the plate 1 in the Pig. 3 corresponds. The device works as follows: After the radial arms B have lowered onto the rotating column C until the bearing surfaces 19 »19 * sit on the prisms 20, 20 ^f , the plate to be exposed is located

30 in the in Pig. 4 position shown. Now the Frame 26 moved against the plate 31 too. Included the centering pins 27 push through corresponding holes in the plates 3o and 31. The plate retains 3o during this movement, thanks to the suspension device 14, 14 ″, 15 freedom of movement and is ensured by the Pins 2? with the greatest accuracy compared to the plate

31 adjusted. Only after the pins 27 through both Plates are through, one of the pins 27 closes the Switch 25 and thus sets the vacuum pump in motion, which in the by the frame 26 * the wall 23 and the Plate 31 formed chamber creates a vacuum, whereby the two plates are firmly pressed together. By the vacuum gauge 29 provided with contacts are according to When a vacuum is reached that is sufficient for the two plates to be pressed firmly together, the lamps 28 are switched on and thus the plate 3o exposed over the negative.

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For a more detailed description of the various movement and switching devices as well as the rest Work stations tann be warped as it is are known facilities that are not claimed here.

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Claims (8)

Patent attorney; ; ■; ·; -,; ··; Stuttgart H. Menrcirir ^ iO S. S6P. 1969 G. Mattfcaes A 28 272 claims 1. Copying machine for transferring templates on plates in the photocopying process, consisting of a carousel with radial support arms arranged on a rotating column and stationary work stations arranged below the same, the carousel with the support arms being rotated by the distance between the stations and the support arms at the Rotating columns can be moved up and down, characterized in that support plates (13) with bearing surfaces (19, 19 ¹ ) and bearing surfaces (19, 19 1), which can be adjusted horizontally and vertically by means of micrometers (17, 18), and the exposure chambers (7, 8) arranged underneath them, can be moved up and down on the support arms (B) ) Support prisms (2o, 2o ') are provided; 2. Machine according to claim 1, characterized in that the support plates (13) on a central pin (15) rotatable about a horizontal axis (16) and attached to the Sides are suspended by means of springs (14, 14 ·). 3. Machine according to claim Ϊ, characterized in that that the plates (L) on the support plate by means of a can be pushed in and pulled out from the side Bar (21) are suspended. -2 - 00980.9 / 0450- 4. Machine according to claim!, Characterized in that that the work station (4) for coating the plates (L) with photosensitive material from a Tub (4), a container arranged below, a pump and an adjustable Yentil between Tub and container. 5. Machine according to claim 1 and 4, characterized in that a dafl between the tub and container The filter is arranged to keep the photosensitive paint flowing back from the tub into the container clean. 6. Machine according to claim T, characterized in that that in the exposure cameras (7, 8) the negative (24) of the template is attached to a glass plate (31) and that a frame (26) with centering pins (27) is doorway, the centering pins (27) through corresponding holes in the Plate (3o) and in the glass plate (31). Be pushed through to the relative position between the negative plate (31 »24) and the one to be exposed Specify plate (3o) precisely. 7. Machine according to claim 6, characterized in that in the exposure canisters (7, 3) a frame (26) slt bitg "a *" Vend (23) is Torgeieaen, which together slt <Ur 9 "fativträg" rplatt ( 31) forms a τβτ-schlieöb «!? Xrnwr into which the plate (3o) to be exposed is inserted and that an dl · bieg · «« · wall »in · VakuuapuMje ang · schloss ·» is. - 3 " 009809/0450 SAD ORfGJNAL 8. machine according to claims 6 and 7, characterized characterized in that the vacuum pump is switched on by one of the centering pins (27), namely only after the pins (27) have pushed through both plates (3o, 31) and the see below exposing plate (3o) has taken the exact position opposite the NegatiTträgerplatte (31). 9 * machine according to claims 6, 7 and 8, thereby characterized in that a contact vacuum gauge (29) is connected to the flexible wall (23), which the exposure (28) only switches on when the two plates (3o, 31) are firmly checked against one another are. Ίο. Machine according to one of Claims 1 to 9 thereby characterized in that the negative carrier plates (31) are adjustable in the exposure chambers (7, 9) by means of micrometer screws. 9,, ft. if QÖ9809 / Q450 BATH ORIGINAL Blank page