US1693504A - Rotary printing machine - Google Patents

Description

New. 27, 1928. 1,6935% A. FALLOT ROTARY PRINTING MACHINE Filed Feb. '7, 1924 Invenior H F&//Of

Patented er. 2?, i928. lhll li fi a insane earsnr critics.

ALFRED FALLOT, OF PLAUEN, GERMANY; HARRY PRIESTER EXECUTOB OF SAID ALFRED FALLOT, DECEASED.

ROTARY PRINTING MACHINE.

Application filed February 7, 1924, Serial No 'This invention relates to rotary printing machines, and more particularly to offset printing machines. It is a recognized fact that ofiset printing grows in favour inthe e printers art on account of the excellent re sults obtained thereby, but it requires very much more skill on the part of the personnel, especially the machine-attendant, than does the ordinary letter press printing. The attendant must be able to constantly watch the printing process and supervise the machine.

He must in particular be able at any moment to examine the form plate for the proper amount of moisture, and according to the quality of the printing Work, hewill have to re ulate certain parts of the machine, especially thedamping mechanism and the inking mechanism and, if necessary, Wipe the cylinders by hand prior to the distribution of the ink. Thus an ,oflset printing machine is to a very much larger extent dependent on the skill and the alertness of the attendant than is the ordinary printing machine, and these are conditions to which the designer of such machine must pay due consideration. It is evident, therefore, that only such of the modern offset printing machines will be able to .answenall requirements of practical work as permitting the attendant to reach and control so all important parts from his stand, especially the cylinders, the inking and damping mechanism and the sheet deliverer. The machine,-

therefore, must not be too high but should be of as compact a construction as possible With- ,out the accessibility of the parts being interfered With. i

Apart from the aforesaid, the printing machine must ossess all such characteristics as can reasonably be expected of a modern machine, such as high eificiency for example.

The accompanying drawing illustrates one embodiment of the invention, the single figure being a longitudinal central section from front to rear of the machine.

In a machine according to the, invention all the usual disadvantages of the character re-- ferred to are entirely absent. The various cylinders are arranged in such a manner, that the'planes passing through the axis of the blanket cylinder and that of the plate cylinder on-the onepart, and through the'axis of the blanket cylinder and that of the impression cylinder on the other part, form an obtuse angle with one another. In this Way the height of the machine may be keptconsiderthe cylinder, and'it becomes possible,

- device.

691,268, and in Germany February 14, 19223.v

ably lower than would be the case if the axes of all three cylinders we-re'arranged in one common vertical plane.

If, now, it were desired directly to feed the sheets to the impression cylinder, which is thelowermost of the three, the feeding device would have such a position to leave not sufficient room for the damping mechanism. According to the invention, however, the sheets-are not fed directly from the feed table to the grippers of the impression cylinder, but they are first taken up by means of an auxillary gripper. Such auxiliary grippers are not new per se, but used in the aforesaid manner and in connection with the aforesaid arrangement of the cylinders they permit of the feed table being placed at a certain distance from to supply the sheets to the said cylinder at a considera'bly lower point of the impression cylinder. In this way room is gained for the damping mechanism and the inking mechanism, and there also remains sufficient free The delivery means at the other side of the impression cylinder may be arranged at about the same height as the feeding means. They are positioned just above the center of the cylinder and the drawing clearly shows, that a delivery pile may be used which is of approximately the same height as the feeding In addition, the course which the sheet takes during its passage through the machine is more satisfactory in the new machine than in the known, because it is not subjected to ve sharp bends. Finally, the machine according to the invention requires considerably less floor space since the delivery pile is arranged directlybelow the sheet deranged, that the plane passing through the axis of the impression cylinder (1. and the blanket cylinder 6 forms. an obtuse angle with the plane passing through theaxis of the blanket cylinder 12 and that of the plate cylinder Z. The damping mechanism we is disposed within this angle, and between this damping mechanism and the inking mechanism-n there is left a clearance of considerable width, at which the attendantmay, at any time, observe whether the plate c vlin der is sufficiently moist and, it' required, damp it by means of a sponge. There is also a clearance at the other side of the transfer cylinder which enables the attendant, who constantly has to supervise the distribution of the ink, to observe whether the blanket of the cylinder is always in the required condition for clean printing. Experience has shown that these features are of extraordinary importance in printing.

The new machine is of contracted design and of moderate height, so that it may be easily attended and supervised. Otherwise the machine is possessed of all the proven advantages of the machines heretofore used, to which must be added the restricted floor space which it requires.

I claim:- 1. In. an oil-set printing machine, a plate cylinder, a blanket cylinder and an imp-ression cylinder positioned so that the p"ane through the axes of the plate and blanket cylinders makes an obtuse angle with the plane through the axes of the blanket and impression cylinders, a feed table, an intermediate gripper for taking sheets from the feed table and passing them onto the impression cylinder, delivery. mechanism arranged at that side of the impression cylinder opposite to the feed table and positioned at approximately the height of the axis of the impression cylinder.

2. In an off-set printing machine according to claim 1 damping and inking mechanisms arranged on the plate cylinder to leave a substantial free space between the damping and inking mechanisms and also between the inking mechanism and the blanket cylinder, whereby constant easy inspection and regulation of damping is made possible.

In testimony whereof I aflix my signature.

ALFRED FALLOT.

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