Abstract: A sheet delivery device is provided that allows for high output and accurate operation during changing of the main stack. The device includes two secondary stack carriers which are normally disposed on opposite sides of the main stack in a first lateral waiting position. The secondary stack carriers are reciprocally moveable between the first lateral waiting position and an operative position. In the operative position, the secondary stack carriers accumulate a secondary stack while the main stack is being changed. This secondary stack is later deposited on the new main stack. Cooperating with the secondary stack carriers are separating elements normally disposed above the secondary stack carriers in a second lateral waiting position. The separating elements are reciprocally moveable between the second lateral waiting position and a separating position. In the separating position, the elements accumulate a temporary stack to form an entry gap above the main stack.

Abstract: In the context of a sheet feeder comprising a suction head, which is provided with separating suckers arranged on a vertically movable support, and at least one row of drag suckers mounted on a support, which is adapted to be reciprocated partly at the same rate as conveyor means for further transport and is preferably able to be pivot for righting oblique sheets, such drag suckers being adapted to be supplied with vacuum on the transfer of a sheet from the separating suckers and to be vented on the release of the sheet to such means for further conveyance thereof, it is possible to ensure a more rapid decrease in the vacuum level on sheet transfer if the drag sucker support, which is able to be reciprocated and is provided with at least one venting opening and a closing member associated with it, such closing member is able to be lifted from its seat within the constant rate range of the drag suckers and the further conveyor means, by means of a control member secured to the suction head.

Abstract: In the context of a feeder, more especially a sheet feeder, comprising firstly a suction device which is placed over a stack of items to be fed, and has a separating devicre with at least one telescoping and preferably vertically reciprocable lifting suction holder, which when a sucker is covered over is able to be retracted against the action of a returning force by the action of vacuum present at such sucker, and secondly a conveyor device which has at least one reciprocating entraining sucking device and is adapted to have such item transferred to it from the separating device lifting such item from said stack, the invention seeks to achieve trouble-free operation and simplicity of operation by the provision of on the one hand at least one vacuum hold nozzle adjacent to overlapping surfaces of the telescopically engaging parts of each lifting suction holder and adapted to be turned on and off in accordance with the entraining suction motion in a manner independent of the sucker, and there is furthermore an

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 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: An arrangement for forming a sequence of underlapping sheets when conveying sheets that are cut off a paper web by a sheeter located in front thereof, to the feed table of a machine working the sheets. Suction equipment is located above the sheet web in the area between two draw-off equipments which are driven at different feed rates. A lifting device is located below the sheet web to bring the rear zone of every sheet into action with the suction equipment, so as to form a guide gap for the following sheet. The suction equipment is provided with a suction box connected to a vacuum supply that may be adjusted stationary during operation. The suction box has at the bottom a punched plate which is provided with a width corresponding to the maximum workable sheet width.

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: An arrangement for metering a blast of air delivered to a driven machine, particularly a sheet separation device of a sheet feeder. A control slide is connected via an air intake opening to a pressure source, and the control slide has an air discharge opening connected to the driven machine and leading into the open. The latter opening is controlled or disconnected during upward movement or stoppage of the machine coupled to the driven machine by means of a control element actuated as a function of the machine speed. The air intake opening and the air discharge opening leading to the driven machine, face each other coaxially, and upon reaching a set final speed, these openings are connectable by means of a coaxial recess passing through the control element. A rotary valve plug with a through-bore is provided to form the control element.