US1814498A - Surface-printing, rotary sheet-printing-press - Google Patents

Description

A. TRUTZEL J ly 14; 1931.

SURFACE PRINTING, ROTARY SHEET PRINTING PNESS Filed Dec. 22, 1928 m/Vs/vme 1? 722 02-25 Patented July 14, 1931 UNITED STATES PATENT OFFICE ALBERT TRUTZEL, OF STE'NDAL, GERMANY, ASSIGNOR TO THE FIRM SCHWARZ-PRESSE, AKTIENGESELLSCHAFT, OF STENDAL, GERMANY SURFACE-PRINTTNG, ROTARY SHEET-PBINTING-PRES Application filed December 22, 1928, Serial No. 327,880, and in GermanyJanuary 2,1928.

. table. Arranging and changing ofthe way of-example.

printing-form can in this type of machines easily be done, as the form is clamped to the cylinder from the 'front and it is only necessary to raise the'feeding-table, carrying the furniture, for placing and exchanging the printing-form. Perfectly clear space is hereby provided for placing the printingform and injury, or displacement of the furniture by a shock, is perfectly excluded. The machine can easily be operated. Besides, it is very simple in construction,

cheap in manufacturing-cost and producing strong prints, as the pressure is not split-up. The negative picture can be transferred upon the printing-form sharp-edged, as the character-picture, made of any kind of material, is, directly transferred with the picturelayer upon the layer ofithe printing-form sensitive to light. Sharp-edged, exact printing-form-negativ-es are hereby produced, as the thickness of the paper, or any other support receiving the picture, is of no consequence.

The printing-cylinder is fitted with papercatchers within .a recess. The paper is only arranged under vertically disposed furniture. To obtain a softer pressure, two rubber blankets placedupon one another, can be provided instead of the one stretched upon the rubber printing-cylinder, producing thereby a soft support. a

The subject of invention has been illustrated in the drawings diagrammatically by Figure 1 is a generalview of" the machine with front shield removed.

Figure 2 illustrates 'the -meshing of the gears providedon the equally large cylinders under relieved pressure. Y

1 indicates the plate-printing-cylinder car.- rying the negative printing-form 3 and 2 the .spectively I always unchanged.

-5. The feeding-table 5 is connected with the table-part 15 by hinges and can be moved with the furniture into the position indicated in Fig. 1 by dotted lines. form is to be inserted or exchanged, the feeding-table 5 is lifted into this position.

The sheet is If the printing- 7 At the moment, when catchers 9, on the per- Inanently rotating printing-cylinder, grip the sheet, the .furnitures 4 will be-deflected and the sheet is passed between the plate-cylinders 1 and the printing-cylinder 2, both being in printing-position, and receives the print from'the printing-form or plate 3, which has meanwhile been inked-in by the inking-device 7 The sheet is thereupon removed with the printed side upwards by a chain-lifter 6. Instead of the chain-lifter 6, any other suitable device can be used. The printing-process is repeated at each cylinder-revolution. I Believing the pressure is effected in such a manner, that the eccentric bearing 16, under the influence of the regulating-rod 17, is turned, until both cylinders'are brought out of contact. This is however only done so far, that the gears 12 and 13 (Fig. 2), mounted'upon the shaft of thecylinders 1 and 2 and firmly connected with the-same, are still in engagement.. Rotation of the cylinders is conse-.

quently not interrupted, so that the position of the two cylinders towards each other, re-

their printing-elements, remains I claim: In a rotary sheet-printing press designed for surface printing, the combination of relatively large cylinders ofequal size, one 'carrying the printing form and the other serving as an impression cylinder, of a feed table including a fixed part arranged in spaced relation 'to said cylinders, and a movable part hinged to the fixed part remote from said cylinders with its free edge positioned immediately adjacent said cylinders for sheet feeding purposes and furniture carried by the free edge of and mov ble with said movable table part, the hinged mounting of the movable part permitting such part to be arranged bodily and wholly beyond a vertical plane passing through the hinge in a direction away from the cylinders, the movable part having such length that when swung upwardly on its hinged connection ample space is provided between the fixed part and the cylinders to, permit a workman to operate directly on the press.

In testimony whereof I aflix my signature.-

1 ALBERT TRUTZEL.

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