Abstract: In order to improve mechanical positive synchronization in a sheet-fed printing machine between gripper carriages guided in wave-like fashion through printing units on endless chains and the associated impression cylinder, the impression cylinders (1) have twice the diameter of the plate and blanket cylinders (2, 3). Sprocket wheels (34), also of twice the diameter of the blanket cylinders, are fixed on the ends of the double-size impression cylinders (1) and on them there are disposed two diametrically opposite gripper carriage locating and fixing devices (24-32) which are adjustable both radially and tangentially and which can also be used to bring the different printing plates into register with one another on the printed sheet (38).

Abstract: The device has a transfer cylinder (2) with a drum (4) which is adjustable in the circumferential direction relative to its shaft (3) and which carries sheet grippers (8) with a front stop (8a) for the sheets (B). The diameter of the transfer drum (2) is equal to 1/N of the diameter of the plate cylinder which carries N printing plates. The shaft (3) of the transfer cylinder (2) rotates at a constant speed and executes N revolutions when the plate cylinder is executing one revolution. By means of a controllable setting device, the drum (4) is so displaced relative to the shaft (3) during each revolution that the front stop (8a), when its transfer position in which a sheet is transferred to the impression cylinder (D) is passed, assumes a position by which the exact register of this sheet in relation to the position of the printing plate printing it on the plate cylinder is set.

Abstract: A gripper device for manually adjusting the position of a pair of gripper rows disposed on opposite sides of the periphery of double-size sheet-guiding cylinders, to a work and turn angle of exactly 180.degree.. Each of the gripper rows includes a cam follower roller and at least one cam follower roller is adapted to have its center-line displaced relative to the axis of the gripper shaft so that the distance between the axes can be varied.

Abstract: A gripper device on a sheet-fed rotary printing machine formed of a sheet gripper seat and a sheet gripper, and having a gripper housing with a gripper arm swivellable about a gripper shaft, comprising an articulation point with an elastic restoring force on the gripper arm, the articulation point being disposed close to the start of a gripper finger having a pressure surface located on one side of a connecting line between a middle point of a gripper shaft and a front edge of the gripper-finger pressure surface, the articulation point being disposed at a location in an area starting from the connecting line and extending over a side of the connecting line located opposite to the side thereof in which the gripper finger is located.

Abstract: In an imbricated formation delivered by an infeed device in each case two printed products lie in pairs upon one another and, viewed in a predetermined product conveying direction, bear upon the upstream or trailing printed product pair. A suction roll is arranged downstream of the infeed device which causes the current lower printed product to be downwardly bent in a direction transverse to a product conveying plane. The leading edges of the printed products are introduced in such separated or fanned apart condition into a respective gripper, engaged by such respective gripper and outfed in a further predetermined conveying direction. The spacing between neighboring grippers is minimal at a product take-over region, so that when the grippers are open in each instance a leading gripper finger of a trailing gripper bears against a trailing gripper finger of the neighboring leading gripper.

Abstract: Flexible printing plates are produced by a printing plate producing machine and then transferred at a transfer station to a series of grippers mounted on an endless roller chain and which can be swiveled and opened by cooperating connecting links to engage the printing plates. The printing plates are then brought to an unloading station where the grippers are pneumatically opened in a receiving head and the printing plates are dropped into a plate stacker for guiding the printing plates into a series of bins.

Abstract: In a method and apparatus for withdrawing a selected number of consecutive copies of newspapers, for instance, from a series of said products travelling horizontally and arranged in overlapping formation (4), a gripper (10) in the form of a mechanical clamp is caused to engage with the desired number of copies by the front edge of the clamp being kept in contact with the formation along a selected distance, the clamp being driven with a speed difference in relation to the formation such that a selected number of copies enter the clamp along the selected distance. At the end of the distance the clamp is closed and its speed thereafter accelerated in relation to the formation, to a speed considerably higher than that of the formation, its direction deviating only marginally from the direction of movement of the formation. Only a few consecutive copies are withdrawn from the formation so that no gaps occur in the formation.

Abstract: The transport apparatus comprises an endless guide device extending in a closed path and at which there are guided a number of entrainment elements. These entrainment elements are interconnected by a toothed belt deformed into a substantially wave-shaped configuration by attachment elements secured at the entrainment elements. At each of the starting region and terminal region of the conveying-active path of the transport apparatus, there are rotatably mounted two parallel cam discs rotatable in a predetermined direction of rotation by related drives. Recesses in the cam discs act upon the entrainment elements such that the latter are driven at the starting region and terminal region of the conveying-active path and are dispositioned in a predetermined mutual position. The spacing between the entrainment elements at the conveying-active path and at the non-conveying active path is compensated by the resilient action of the wave-shaped deformed toothed belt.

Abstract: A sheet transfer conveyor for rotary sheet feed printing press comprising a pair of chains which support and transport a plurality of gripper carrying trolleys which successively engage the leading edge of a sheet from a printing press cylinder, such as an impression cylinder, for removing the sheet from the cylinder and transferring it to the next printing unit or to a delivery unit. The trolleys are supported on the chains by resilient mountings which, following engagement of a sheet by the gripper, pivot the trolley under a spring biasing force to maintain substantially constant tension on the sheet throughout the period the sheet is being removed from the cylinder. Guide rails are provided which define a guide channel for guiding the trolleys into predetermined relation to the cylinder for engaging the sheet, and at such point, the guide rails are recessed to permit pivotal movement of the trolley under the biasing force of the spring mounting.

Abstract: A conveying apparatus for panels is equipped with two revolving endless conveyor belt members such as chains etc. The chains are connected with each other with successively arranged transverse organs such as cross bars. On each cross bar there are mounted displaceably with braking two panel-engaging devices comprising clamping springs for gripping and transferring panels from a charging to a discharging station past a random number of intermediate processing stations. Two pneumatically operable pusher members push the panel-engaging devices into contact with the lateral edges of an arriving panel and cause the clamping springs to grip the panel. At the discharging station, two separating pusher members of similar construction open the clamping springs and push the panel-engaging devices apart toward their terminal positions at opposite ends of their cross bar, thus setting the panel free to be discharged from the apparatus.

Abstract: A gripper device for a printing machine for handling sheet-shaped material with a gripper shaft swivellable about its longitudinal axis and a gripper finger firmly connected to the gripper shaft so that a gripper point thereof is movable away from a gripper support when the gripper shaft is swivelled in a first direction, is initially displaceable into contact with the gripper support when the gripper shaft is swivelled in a second direction opposite to the first direction, and is capable of exerting a holding force on the gripper support when the gripper shaft is swivelled farther in the second direction, and a device for adjusting contact between the gripper point and the gripper support includes a resilient section forming a part of the gripper finger and connected to the gripper point, the resilient section having neutral fibers and formed as at least one resilient rod extending substantially in the direction of a plane determined by the longitudinal axis of the gripper shaft and by the gripper point.

Abstract: Sheet transfer drum located between two printing units of a multicolor sheet-fed rotary printing press and having a cylindrical surface formed of a plurality of sheet-carrying elements arranged in succession around the circumference of the drum, including a suction means applicable to the trailing edge of a sheet of paper to be printed, mountings located at ends of the sheet transfer drum for carrying the sheet to be printed, each of the end mountings being formed by a respective guide channel oriented in circumferential direction of the sheet transfer drum, the guide channel having a radially outer portion and a radially farther inward portion, at least the outer of the radial portions being substantially equal in length to a maximum format of the sheet.

Abstract: A gripper assembly includes a movable clamp member which is rotatable relative to a stationary clamp member from a fully open position to any one of a plurality of closed positions to grip an article of a selected size between clamp members. When a releasable clutch or retainer assembly is in an engaged condition, the clutch prevents rotation of the movable clamp member from any one of the closed positions back to the fully open position. An actuator assembly is operable to release the clutch to enable the movable clamp member to rotate back to the fully open position. The clutch includes a coil spring having a plurality of turns which grip surfaces connected with the stationary and movable clamp members when the clutch is in the engaged condition. The actuator assembly operates the clutch from the engaged condition to the release condition by applying a force to the turns of the coil spring urging the turns to flex in a direction tending to increase the diameter of the coil spring.

Abstract: A control and regulating apparatus for a sheet-delivery device for sheet-processing machines, and in particular, for sheet-printing machines, is provided.Several of the adjustable elements of the delivery device have separate control motors with feedback of the setting attained to a reference-value-setting meansor they have electromagnetic valves. The reference-value-setting means is provided with a respective input means for paper weight, sheet format and speed of rotation of the machine, and it is connected to or integrated with a computer which supplies to the reference-value-setting means the reference values in respect of all settings of the feeder, such reference values being empirically determined for each operating condition and stored in the form of a family or characteristics.

Abstract: A device for withdrawing printed sheets from a delivery of a sheet-fed rotary printing machine for examination and sorting purposes, the delivery being a chain delivery with gripper rows attached to the chain and having grippers operable by cam control, withdrawal of the printed sheets being initiated by a delayed opening of the respective grippers, includes a first gripper-opening cam, means for releasing the first gripper-opening cam from a locked position thereof so that it is engageable with a rotating control cam for bringing the first gripper-opening cam into a position wherein opening of the grippers is effected and is prevented, a second gripper-opening cam for initiating a delayed opening of the grippers, the second gripper-opening cam being disposed downstream from the first gripper-opening cam in travel direction of the printed sheets, and means for feeding the printed sheets released from the grippers, when the grippers are opened, directly to a conveyance device for further transporting the print

Abstract: The printer is constructed for multiple merging feed paths sharing a pivotable brake and by means of adjustably mounted different sets of rolls different combinations in the disposition of the rolls and the brake vis-a-vis the platen drum different modes of transportation are attainable.

Abstract: A sheet handling mechanism for use in a duplicating machine for duplicating images on both sides of copy sheets including a first printing couple for transferring a first image to a first side of a copy sheet and a second printing couple for transferring a second image to a second side of the sheet. The sheet handling mechanism includes a conveyor movable between the first and second printing couples. Gripper mechanism are operatively associated with the conveyor for gripping the lead end of a copy sheet issuing from the first printing couple and rotating the sheet about an axis generally parallel to the direction of movement of the conveyor to present the second side of the sheet, lead end first, to the second printing couple.

Abstract: A strip conveyor transports a strip by the edge thereof with a guide clip, the ends of which are coupled to chains of the conveyor. Sensors are arranged at a position where the clip becomes disengaged from the conveyor, and upon both ends of the clips reaching this position, a holding and transporting device engages the strip, and then conveys it for cutting along lines perpendicular to edges of the strip.

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 apparatus for individually conveying printed products arriving in an imbricated product stream, comprising a number of driven controlled grippers revolving and guided in a closed path of travel for engaging the leading edge of the printed products. The gripper drive contains means for temporarily restraining the grippers. The gripper drive has at least one continuously driven sluice for the cycled recall of the restrained or stopped grippers. Operatively associated with the sluice is an endless revolving conveyor element equipped with entrainment members engaging the trailing edge of the products, the entrainment members being provided at a uniform spacing at the conveyor element. The conveyor element, as concerns the entrainment members, is driven in cycle with the sluice and opposite in sense to the sense of rotation or revolution of the grippers. There is also provided an infeed device having a drive operatively coupled with the drive of the sluice by a synchronous control.

Abstract: An image transfer device for transferring an electro-photographically formed image onto a transfer medium comprises grip means for gripping the transfer medium, supporting and moving means for supporting the grip means and moving it cyclically in an endless form, feed means for feeding the transfer medium to be gripped by the grip means, the feed means having a movable paper guide plate disposed adjacent to the path of cyclical movement of the grip means, corona transfer means for transferring the image onto the transfer medium gripped by the grip means, separator means for separating the transfer medium from the grip means, transport means for transporting the separated transfer medium, and control means for causing all of the above-mentioned means to cooperate with one another.

Abstract: A chain delivery sheet feeding device, including a sheet size selector switch for selecting a desired sheet size among paper sheets of different sizes which are separately carried on a plural number of paper trays located within the apparatus. A plurality of grippers are provided on chain members for gripping the paper sheets. A sheet releasing device is also provided for separating the paper sheets from the grippers. The sheet releasing device comprises a switching member having a movable gripper-releasing cam member which is adapted to operate under the control of a solenoid device which determines the sheet releasing point for the grippers. A size selector switch and the sheet releasing point determining solenoid device are opreated in relation to each other by means of a delay circuit in such a manner that a current sheet releasing point is retained until the last one of a number of copy sheets for a preceeding original size is released.