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 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 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 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.

Abstract: Cylinder and rollers for printing machines such as offset cylinders, impression cylinders, form cylinders and dampening rollers. The cylinder or roller has a core or cylinder proper, and a layer thereon which is inseparable from the cylinder proper. This layer has a thickness of 0.05 to 0.6 mm.This layer may consist of a metal alloy selected from the group of nickel-chromium and nickel-chromium-boron-silicon.

Abstract: Cylinder and rollers for printing machines such as offset cylinders, impression cylinders, form cylinders and dampening rollers. The surface of the cylinder or roller consists of a layer inseparable from the cylinder proper. This layer has a thickness of 0.05 to 0.6 mm and consists of an oxide selected from the group of Al.sub.2 O.sub.3, TiO.sub.2, Cr.sub.2 O.sub.3, ZrO.sub.3 and Mgo and a combination of these oxides.This layer may also consist of a metal alloy selected from the group of nickel-chromium and nickel-chromium-boron-silicon.

Abstract: The drive of a rocking initial gripper of a sheet printing machine is derived from the shaft of the impression cylinder by a control cam by way of a control roller and a control lever fixed directly on the shaft of the rocking initial gripper without intermediate elements.

Abstract: The rocking motion of the transfer cylinder of an inking system of printing machines is derived in dependence on the turning of the ductor cylinder by a couple of cams, one of which is fixed, the other adjustable, by means of ratchet wheels and pawls, adjusting thereby the magnitude of turning of the ductor cylinder and thus also the length of mutual contact of the ductor cylinder with the transfer cylinder.

Abstract: In an offset printing apparatus the tripping into pressure contact as well as the tripping out of pressure contact of the printing cylinders and the operation of the paper feed apparatus are controlled by a multi-arm lever that is operated by a double disk cam. The multi-arm lever operates the various printing cylinders and the paper feed mechanism through a number of control rods.

Abstract: Apparatus for seizing and holding the trailing edge of a paper sheet for transfer and turn-over in a printing press. The sheet transfer cylinder is provided with a rotatable central shaft and a plurality of segment members arranged in spaced planes radial to the shaft in at least one set to provide a cylindrical circumferential surface for the paper. The apparatus comprises a first elongated rod extending through the segments of the set and journalled for rotation about its longitudinal axis, brackets fixed to the rod and extending toward the circumferential surface, and a second elongated rod journalled in the brackets for rotation about its longitudinal axis exterior of the segments. Gripper elements are carried by the second rod, and a counter-ledge or bar is carried by the brackets. The gripper elements are adapted to cooperate by mechanical action with the bar to seize the paper sheet on movement of the second rod.