Abstract: For printing machines furnished with a Direct Imaging system for preparation of printing plates there is designed an equipment, comprising an auxiliary drive unit (23) coupled with the plate cylinder (1), which is coupled with the gear wheel assembly by disenagageable coupling means. In the preferred embodiment the plate cylinder (1) is at one end accommodated in a bearing (27) of a print unit side wall (4) by means of a carrier (3) which is axially shiftable seated at the neck (2) of the plate cylinder (1) and is in a direct engagement with the plate cylinder (1). The carrier (3) is further by means of a belt drive coupled with an auxiliary drive unit (23) and by an electrically operated clutch (7) with an output wheel (6) of the gear wheel assembly. In another preferred embodiment the plate cylinder (1) is furnished with a mechanism for angular displacement and a mechanism for axial shift.

Abstract: A device which performs the lifting and throw-off of an impression cylinder in a printing machine, comprises a first supporting pin (1) which carries a gate (2) that is provided with a run-out path (4) and stop (3). Upon disengagement of the impressional forces, the stop is in engagement with a first projection (6) on a first catch (7), which is swingably mounted on a second supporting pin (15), fixed in a side plate (16) of the machine. A connecting tie rod (9) is fastened to the first catch (7) by a pin (8), and another end of the connecting tie rod (9) is connected, by a second pin (10) to a second catch (11), mounted slightly turnably on a basic pin (28). The second catch is provided with a second projection (12), which becomes engaged with stop (3) of gate (2), upon engagement of impressional forces, and against the run-out path (4) which bears against an operating roller (13 ) of a driver (14).

Abstract: A dampening device for the continuous dampening of printing forms, particularly in offset printing machines has a supporting pin and a supporting sleeve, which are mounted in side walls of the printing machine. Holders are rotatably mounted on the pin and sleeve, and a transfer roller is removably mounted on the holders. The transfer roller, when mounted, is in permanent contact on one hand with a bathing cylinder, and on the other hand with a spreader roller. The holders are rotatable about the axis of the bathing cylinder.

Abstract: An improved suction feeder, particularly for printing machines is disclosed, wherein higher feeding and printing speeds are made possible.The main features of the invention is that in the body of the suction feeder is a small conduit channel and an air filling small channel which connect an inleading small channel for the bringing of pressurized air into an empty space over a small piston. In the said small conduit channel is formed a pressure spring in the upper part of said small conduit channel, and a seat in which a small ball is placed on the other end. The above described suction feeder works on the principle of the difference of air pressure above and below the small piston. While individual paper sheets are being lifted from a pile of sheets, the pressurized air is led into the empty space over the small piston, by which it instantaneously neutralizes the remaining depressurized air, leading to an instantaneous loosening of the paper sheets.

Abstract: Mechanism for the control of an inker unit, particularly on an accessory device for the numbering of sheets, for additional printing, and for the perforation of sheets on a printing machine. The mechanism provides an automatic control of the inker unit as well as a manual control thereof, and provides for the disengagement of the inker unit out of the working position in such a way as to form a convenient working space in the area around the numbering roller. On an eccentric shaft, which is arranged in the side walls of the printing machine, there are attached connecting levers which are slidably arranged on a carrier shaft which is provided with carriers which are rigidly connected with guides. On the guides there is adjustably arranged an accessory device including an inker unit, there being provided openings in the connecting levers in which are arranged slide elements which are located on pivots which are fixed in the side walls of the printing machine.

Abstract: Mechanism for the control of printing pressures in a printing machine, particularly the printing pressures exerted by accessory devices such as a unit for the numbering of the printing articles. A single mechanism controls the single functions of the printing mechanism, such as the bringing into pressure engagement and the disengagement of the printing cylinders, the control of the inking unit, the control of the numbering device, and also possibly of other mechanisms. Around the circumference of a double-cam, there are arranged a plurality of two-arm levers. A first two-arm lever, which is pivotally arranged on a fixed, pivot pin is connected by means of a first pull rod with the mechanism of the inker unit. A second two-arm lever is journalled on a second fixed pivot, the second two-arm lever being connected by means of a second pull rod with a mechanism for imposing printing pressure and releasing such printing pressure.

Abstract: Control device for the offset cylinder of an offset printing machine, said control device selectively governing the movement of the offset cylinder into printing engagement with the plate and impression cylinders of the printing machine and the movement of the offset cylinder away from said plate and impression cylinders to relieve them of printing pressure. The control device mounts the offset cylinder sufficiently stiffly in the frame of the printing machine so as to avoid faults in the printing as, for example, the formation of strips on the printed paper sheets. The offset cylinder is rotatably mounted on an eccentric shaft which is mounted in first adjustable bearings which are arranged in eccentric bushings. On said eccentric bushings there are mounted second adjustable bearings which are arranged in bearing flanges which are adjustably fastened in the side walls of the printing machine.

Abstract: The invention is a universal sucker element for a paper feeder unit which comprises a support tube on which is adjustably mounted a carrier provided with a swivably mounted body having a rotatable and movable piston. The body can be adjusted so that the piston moves obliquely to the plane of the paper. The position of the body and the piston are fixed by means of simple position locking means.

Abstract: The invention is a device for increasing the ink supply to the inking unit of a printing machine. The device provides a means for changing an intermittently rotating doctor roller to a continuously rotating doctor roller without changing the adjustments required to operate as an intermittently rotating doctor roller thereby increasing the supply of ink to the inking unit.

Abstract: A sheet feeder device for a printing machine, having a pneumatic feeder head including a regulating screw mounted therein and provided with a pressure spring which is arranged between a shoulder of the regulating screw and a rest which is attached to a two-arm lever. To the frame of the printing machine is fixed a spacer on which are adjustably arranged straightening elements provided with rigidly attached eccentrics. The eccentric is turnably mounted in a body, in which is also turnably arranged, a connecting screw which is provided with a centering ring and a catch which seats on a bar fixed to the side wall of the printing machine. The straightening element is provided with a stop, on which bears a lever which is attached to the eccentric. A guide piece is also fixed to the straightening element. The device according to the invention enables the feeding of letter envelopes without the need of a special auxiliary device to be mounted to the printing machine.

Abstract: The invention relates to a sheet transfer device, for offset printing machines which print on one side of the sheet or on both sides of the sheet of paper, having a means for adjustment to accommodate sheets of different sizes, achieving thereby an accurate register printing.The feature of the device according to the invention is a reset wheel of the sheet transfer drum which is adjustably mounted on a centering flange, on rollers rotatably mounted on eccentric pins mounted in the centering flange. The centering flange has rotatably mounted eccentrics, which bear on carrying projections of the transfer drum body, while the transfer drum reset wheel is fastened to the flange. The clearance between the reset wheel and the flange centering diameter is adjusted by eccentric pins, while at the same time the reset wheel is centered so that its gearing is precisely centered with the transfer drum axis. The clearance of the toothing of the reset wheel is taken up by take-up segments.

Abstract: The present invention is a device for a multicolor printing machine which permits continuous and precise axial setting of a form cylinder to obtain quality register printing during the printing operation of the machine. After setting of the form cylinder, it is also possible to eliminate clearance between the elements of the setting mechanism. The control elements are advantageously arranged on one side of the machine in such a manner as to be easily accessible for the operator. The device enables the elimination of clearance between the elements necessary for the axial setting by means of securing elements and the coupling of the drive gear with the form cylinder by means of a carrier in which the radial clearance has been eliminated and as a result, the shifting of the drive gear is made possible without introduction of radial clearance.

Abstract: The invention is a photoelectric sensing device, in the body of which is rotatably mounted a photoelectric sensing element, the sight opening of which is arranged in a plane with the front stops and bears on the vertical front plane of the pile of paper sheets. The body of the photoelectric sensing device can be mounted on the carrier rod of the front stops. The sensing device provides an advantage in that the device works with daylight and also with artificial light so that a special source of light is not necessary for operation of the sensing device. As a result of arranging the photoelectric sensing element in the plane of the front or lateral stops, the sight opening glass is continually wiped by falling paper sheets and is not obscured by dust. The photoelectric sensing device is simple to manufacture and is reliable.

Abstract: The invention relates to a drive device, particularly for offset printing machines, in which a control lever is mounted on a pin fixed in the side wall of the printing machine and is connected by means of an adjustable bar to a swing fork, in which a variable speed gear box is mounted, joined by means of a drive belt to a common pulley, which is linked intermediate of a V-belt to a free part of an electromagnetic clutch which is electromagnetically connected with the stationary part of said clutch. The stationary part of the clutch is mounted on a worm gear which engages a worm joined with an electric motor for the tip - motion of the printing cylinders.The device provides the advantage, that the control of the variable speed gear box ratio is accomplished by a separate mechanism and the impulses for increasing or decreasing the number of revolutions of the printing machine is effected electrically.

Abstract: A technique for correcting backlash in gears utilized in printing machines. The backlash is corrected by means of toothed segments, i.e. sections of a gear, with each segment having gear teeth of varying width, with the teeth at the center of the segment having greatest width and the width of successive teeth decreasing by 0.005 to 0.6 mm to minimum values at both ends of the segment. Each segment is positioned so that the gear teeth of proper diameter to reduce backlash are disposed next to the teeth of the gear on which the segment is mounted.

Abstract: A control mechanism for grippers of a sheet delivery device particularly on a printing machine, is disclosed. A chain delivery device is provided with a gripper mechanism whereby printed paper sheets coming from a printing unit are grabbed by the grippers, then carried to a delivery area at which point the grippers are opened and the paper sheets are released by the grippers and fall onto a pile of sheets.

Abstract: An arrangement for adjusting the rotational phase angle of the form cylinder of a printing machine to obtain proper image registration, for example for multicolor printing operations. Adjustment is accomplished by a toothed ring which can be rotationally adjusted and which is slidably engaged with a connecting gear affixed to a drive gear. A control shaft may be rotated to axially move the drive gear with respect to the toothed ring, and an expandable radial bearing is coupled between the control shaft and the drive gear.

Abstract: A sheet feeder drive for transferring paper sheets from a pile to a feeder device which is driven by a common drive shaft which enables adjustment of the feeder according to paper size and also enables the vertical setting of the feeder.

Abstract: A gripper mechanism for seizing the trailing edges of paper sheets on a transfer drum of a printing machine. A plurality of rollers are resiliently mounted so as to be rotationally shiftable toward the direction of movement of the paper sheet. The rollers are oriented at various oblique angles with respect to the movement direction, with rollers further from the middle axis of the transfer drum being oriented at a greater oblique angle than rollers closer to said axis.

Abstract: An apparatus for tripping into pressure contact and release an offset cylinder utilizing a worm-shaped body firmly mounted on the cylinder shaft and provided with a worm in engagement with a worm wheel rotatably mounted on the shaft and provided with an integrally formed lever connected by a carrier pivot with a pull rod for tripping the pressure cylinder. The worm-shaped body is divided by an adjustable clamping recess, while the carrier pivot is shiftably arranged on one end of a pull spring, the other end being attached to a wall of the printing machine.