DE151274C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

According to D. R. P. 118475 and 126219 The gelatine images produced are suitable for the extraordinary transparency of the gelatine color for the sake of excellent for multi-color prints. But it is not possible by means of these machines To make multi-color prints. So that the individual prints in multi-color images coincide, the paper must always be placed in the same place and afterwards when it is pressed onto the mold, it remains meticulously in its position.

The movement of the long metal plates that are beveled at the sides Counter pressure plate of the D.R.P. 118475 is a fluctuating; also takes place when rolling up a stretching of the endless belt takes place in the flat position.

Because of these inconveniences, it was necessary to moisten the paper strongly; the stretch Because of the paper, this is not possible with multi-color prints.

With the D. R. P. 126219 the paper suffers considerable friction during its movement under the rigid counter-pressure plate. In addition, when the form and the counter-pressure plate meet, creases easily form in the paper, since the same thing must not be clamped tightly over the rigid edge of the counter pressure plate.

Both machines inevitably have a slight stretch after printing of the paper and thus a displacement of the individual prints; it is also impossible Insert the sheet precisely into the machine.

To remedy these inconveniences, the following execution serves: To avoid any friction of the To eliminate paper on the counter pressure plate, the paper is fed through a roller to the Pressed printing form and the even load on the paper after printing causes a light roller system.

With the use of a 'pressure cylinder there is also the possibility of Color printing to achieve an exact matching of the individual prints; the first Designed as a pressure cylinder roller is for this purpose with the known application device Mistake.

To execute the print, as can be seen from the accompanying drawing (FIGS. 1 and 2), the printing forme α is placed on the adjusting screws c guided through the slide plate b and brought to the appropriate height by means of the adjusting screws. The slide plate b, which runs on rollers on the lower side, rests on the metal prisms d; the sheet of paper, tinfoil and the like to be printed is now first brought from the feed table f to the gripper g of the printing cylinder h and is held in the usual way by means of the same. If the crank i is rotated, then the slide plate b with the printing forme α is pulled over the prisms d by the gears k ¹ engaging the racks k. At the same time, the gears I ¹ and Z ^{2 set} the printing cylinder h in rotation, and after the front edge of the sheet has come into contact with the printing forme and has been released by the grippers, the sheet is pressed evenly onto the same as the printing forme moves on. By the

If the cylinder rolls vigorously over the sheet, he squeezes the excess of the liquid gelatin ink from the printing form; the rollers ^hl hold the paper firmly on the gelatine that has remained in the indentations of the mold until it has solidified. After the gelatine has hardened, the sheet with the gelatine image adhering to it is lifted off the form and the slide plate with the printing form is returned to the starting point. In the case of multi-color printing, the images are dried after the respective printing, coated with varnish and passed through the machine again while strictly observing the registration device.

When using a sheet that, because of its suppleness, remains tight on the printing forme after printing, such as, for. B. with wax paper sheets, thin sheets of tin and lead, the so-called tinfoil, etc., the load rollers h ¹ may be omitted in the machine. For this purpose, the tinfoil can be coated with white paint, silver-plated or gold-plated, or the images can be transferred from the waxed paper or tinfoil, which in this case must be greased, onto the paper using the known method.

Claims (2)

Patent claims: ■ 1. A device for the production of gelatin images, in particular also of multicolor images, characterized in that, instead of a counter-pressure plate, a roller (h) wiping off the excess of gelatin ink and a roller system (h ¹ ) which contains the in the depressions of the printing forme (a) remaining gelatin color loaded with the sheet adhering to the same during solidification, comes to use. 2. An embodiment of the device according to claim 1, characterized in that the rollers of the roller system (h ¹ ) are mounted in such a way that they 'can be removed from their bearings for the purpose of printing water-impermeable, pliable sheets, such as B. tinfoil to omit the unnecessary burdening roller system (h ^l ). 1 sheet of drawings.