Abstract: In the case of a sheet feeder comprising a suction head which is arranged over a rising table for a stack of sheets and bears at least one sucker able to be connected with a source of vacuum and with air synchronously in steps with the operation of the equipment, a cam predetermined such steps and, following the suction head, a sheet conveyor, it is possible to achieve a more precise operation and more gentle handling of the products by providing an air supply duct and a vacuum duct, which are associated with the at least one sucker provided, and alternately switched on and off by a switching valve arranged near the sucker. For its part, the valve is operated by a control valve, actuated by the cam.

Abstract: In the context of a sheet feeder comprising a stack carrying table able to be moved by a lifting device and having front and side abutments, precise positioning of the stack is facilitated inasfar as the stack carrying table is composed of a supporting table adapted to be connected with a lifting member of the lifting device and of a loading stage supported on the carrying table for free movement in its own plane in substantially all directions within the plane. The sheet feeder furthermore has a clamping device which is able to detachably clamp the stage to the supporting table.

Abstract: In order to achieve a mechanical retraction of piles in a sheet feeding apparatus with a lifting table, the lifting table can be lowered to the level of the floor and serves to take up, one at a time, a pile supporting surface loaded with a pile of sheets. Each of the pile supporting surfaces is in the form of a mobile carriage and there is a carriage retracting mechanism with a tugging device which is located on the floor. The tugging device has a reversible driving device, bridges a distance of at least one length of a carriage, is situated outside the surface area of the lifting table, and has at least one dog able to engage and disengage by the lifting or respectively lowering motion of the lifting table, with a coupling element. The coupling element has edges of contact parallel to the lifting or respectively lowering direction of the lifting table, is fixed to the carriage, and projects over the surface area of the lifting table when the carriage is on the lifting table.

Abstract: In the case of an apparatus for forming a stack of sheets comprising a brake means placed at (in terms of sheet motion) the leading edge of the stack and downstream from a sheet transport means, the brake means having at least one brake roller driven at a lower peripheral speed than the speed of transport of the sheets and a timed sheet nip member adapted to engage a sheet and move it towards the brake roller, one aim of the invention is to ensure reliable retardation and straightening of the sheets without damage to them.

Abstract: The invention relates to a sheet feeding apparatus for supplying a sheet fed processing machine having a continuously running intake with successive sheets, preferably without any gaps between their leading and trailing edges and comprising retractable front sheet guides for halting the sheets and sheet advancing means adapted to operate in step with the feeding operation, said advancing means being driven from a one-turn shaft, that times the feed operation and drives the advancing means through a transmission responsible for advancing or retarding the sheets in relation to the rotation of the one-turn shaft as a function of the size of the sheets, said transmission having an output shaft moving in steps. In order to make it possible for the processing machine to be supplied with two superposed sheets at a time the apparatus comprises two superposed sheet advancing means operating in step and having superposed front sheet guides and able to be moved in step and at the same speed.

Abstract: The present specification discloses an apparatus for washing a rubber blanket cylinder of a printing machine. The apparatus comprises a cleaning cloth which extends between a supply roll and a take-up roll, with control and drive means adapted to rotate the take-up roll in a step-wise manner to thus take up uniform lengths of cleaning cloth. A rotatable guide roller is arranged to press the cleaning cloth between said rolls, against the rubber blanket cylinder, the rotatatable guide roller having a resiliently deformable outer surface across which the cleaning cloth is guided. A reversible brush roller is located upstream of the rotatable guide roller in the direction of rotation of the rubber blanket cylinder, and is in contact with said cylinder, and a cleaning agent supply and a water supply are arranged to feed said brush roller.

Abstract: A sheet accelerating device driven by the single-revolution shaft of a feeding attachment with a front-feed unit which runs faster or slower than the single-revolution shaft is constructed in such a way that high feeding accuracy is also guaranteed at high operating speeds, and this is achieved by the provision of an intermediate gear between the advancing unit and the single-revolution shaft, the intermediate gear having a step-by-step motion gear and control gear which allows adjustment of the speed of the rotating element of the step-by-step motion gear for a part of its rotation in relation to the speed of the single-revolution shaft.

Abstract: For designing an automatic reel change system for use in connection with the processing of a web from a reel (7, 8) on a reel support (2), the web being sheeted in a transverse cutter (3), the invention takes the form of a system which makes do with a very narrow web part having a greater-than-normal thickness, but, nevertheless, safely joining the two webs together; the reel stand (or support) (2) has support parts (9 and 10) for at least two reels (7 and 8), from which, on reel change-over, a double web, made up of old web (11) (web coming to an end) and new web (12) (web from the new reel), may be taken, and near the path of the web, a cutting station (14) is present, able to be put into operation for cutting through the double web, a joining station (15), able to be put into operation the necessary time after operation of the cutting station (14), for joining the end (30), produced on cutting operation, of the old web (11) with the leading edge (31), produced on cutting operation, of the new web (12), usi

Abstract: The rear cross rod that supports the carrier rods insertable in grooves in a stacking table for continuing the lifting of a residual stack while the table is lowered for loading a fresh stack without interrupting operations from the top of the residual stack, supports the cross rods from hanging collar brackets on its underside so that the rear cross rod has its body above the carrier rod and is adjustable along the length of the carrier rod and can function as an effective rear stack stop to stabilize the stack position. In one embodiment the rear cross rod is fixed in its position for a particular stack size by clamping sliding brackets on lateral rods that run from the respective ends of the front cross rods back to an extremity at which the rear chains of the hoist are connected.

Abstract: A sheet feeding arrangement with a side pulling mark for subsequent sheet alignment, in which at least one pulling element actuated cyclically with the sheet feeder and moving back and forth transversely to the direction of sheet movement, grasps the sheet to be aligned and pushes it against a stop strip. The pulling element is in the form of a suction grip located beneath the sheet to be aligned. The suction grip is kept movable on a bearing member moving back and forth transversely to the sheet feeding direction. The bearing member has a stop located forward in the pull direction, and is assigned to the suction grip. The latter can be returned to its stop position after each deflection by a spring acting in the pull direction. This spring is adjustable, and the suction grip has a suction cup which is rotatable about its axis. The suction cup is also movable perpendicular to the plane of the sheet. The suction grip is pivotably mounted on the bearing member.

Abstract: A sheet feeding apparatus with a cross-cutter in front and an arrangement, following the cross-cutter, for forming a series of underlapping sheets with lifting and holding elements in a region between two withdrawal devices driven at different feed speeds. These elements lift the rear end of each sheet to form a lead-in gap for the following sheet. The lift and holding elements are fastened, furthermore, to continually driven transport elements and are kept on a straight path in the engagement area slightly delayed relative to the following withdrawal device. The lift and holding elements are uniformly distributed across the width of the sheet, and are fastened to a strip picked up by chains located on the side. Several strips are provided spaced at sheet-to-sheet spacing. The track of the lift and holding elements descends slightly in the transport direction. The strips connected to the lateral chains are guided in lateral rails which are adjustable.

Abstract: Suction-pulling devices for engaging the underside of a lifted top sheet of a stack of sheet material are carried on short carrier pieces inwardly extending from the respective front ends of two swing rods suspended above the stack near its sides. The swing rods are suspended on two crank arms, the most rearward of which is continuously driven to cause the front ends of these rods to describe an oval path in the vertical plane. The upper part of this path, which provides the forward motion, matches the speed of a suction lifter for the top sheet in a rear path portion and matches the linear speed of the drive rolls of a succeeding transport device in a forward portion. The suction-pullers are rotatable about a horizontal axis to fit the lay of the sheet being transferred and a control cam on a bearing of the rear supporting crank arm also produces a slight outward pull of the suction lifters during the forward motion to stretch the front edge of the sheet.

Abstract: A top-sheet feeder in which the feed table comprising suckers engaging a sheet fed from the top of the stack, is pivotable to position the input end of the feed table at any offset position the sheet may have occupied at the top of the stack; the feed table comprising an end portion to direct the suckers upstream of the pivot normal to the leading edge of the sheet and thus align them correctly for output from the feeder.

Abstract: A device for feeding sheets to another machine, said device having conveying rollers continuously rotating at the same peripheral speed as the receiving rollers of the fed machine. Gripper devices reciprocate toward and away from the conveying rollers to pick up a sheet and accelerate it to the peripheral speed of the rollers. The gripper devices are disengageably coupled to the conveying rollers to be driven thereby and to be actuated in time sequence with the fed machine.

Abstract: An automatic adjusting device for stack changers in a sheet feeding device which compensates for the progressive drop formed on the residual stack as the auxiliary stack table is withdrawn.

Abstract: A fork-like stack changing table arranged to support a residual stack and to be withdrawn when the next stack is raised to it. Sealing strips seal the space between the stacks and the fork rods and means are provided for applying compressed air to the space between stacks. In this way, the residual stack bears lightly upon the auxiliary table and it can be withdrawn permitting the main stack to join the residual stack.