Abstract: Sheet feeding device (1) comprising an elevator (2) for a stack of sheets, and an air supply system (3) configured to supply and direct one of more air streams towards an upper region (4) of the sheet feeding device (1) for floating a plurality of upper sheets of the stack of sheets, wherein the elevator (2) comprises a vertically movable support (5) for supporting the stack of sheets from below, wherein the sheet feeding device (1) comprises a first side support member (6) and a second side support member (7) configured to sideways support respective opposite sides of the stack of sheets, wherein the sheet feeding device (1) further comprises a vacuum belt feeder (8) provided above the elevator (2) and configured to grab and feed an uppermost sheet of the floated sheets away from the floated sheets, and wherein an upper portion of each side support member (6, 7) is provided with at least one respective cam (9) comprising a respective guide surface extending obliquely upwards-inwards from the respective side

Abstract: A document stacker (1) for receiving documents from a document processing device (3), wherein the document stacker comprises: a document support (4), and a frame (5), wherein the document support is attached to the frame by a linear guide means configured such that the document support is linearly movable with respect to the frame along a predetermined path of movement (7) inclined to a horizontal plane, and wherein the document stacker further comprises a load cell (14) configured to resist relative movement between the frame and the document support along said predetermined path and to emit an output signal representative of the load applied to the load cell by the document support.

Abstract: A post-processing device (1) for simultaneously performing both square folding and trimming of a booklet (3), wherein the device (1) comprises a square folding assembly (8) and a cutting assembly (5) at least one of which is movably attached to the post-processing device (1), and a clamping assembly (17) for holding the booklet (3) static during operation of the square folding assembly (8) and the cutting assembly (5). Also, a method of operating such a device (1).

Abstract: Method for controlling a sheet feeding device (1) comprising an elevator (2) for a stack of sheets, and an air supply system (3) configured to supply and direct one of more air streams towards an upper region (4) of the sheet feeding device for floating a plurality of upper sheets of the stack of sheets, wherein the elevator comprises a vertically movable support (5) for supporting the stack of sheets from below, wherein the sheet feeding device comprises an optical sensor (6) positioned adjacent the floated sheets for measuring light reflected from the floated sheets at a plurality of different heights, wherein the method comprises the steps of: continuously deriving from the optical sensor a density reading (DR) indicating the density of sheets floated, continuously deriving an average density (AD) based on a plurality of density readings, continuously deriving an upper density limit (UDL) based on the average density multiplied by a predetermined upper density limit factor (UDLF), continuously deriving a l

Abstract: Disclosed is a paper feeding device (10) comprising a storage surface (14) for a stack of papers (12), with a leading edge (14a), a trailing edge (14b), and a first and a second side edge (14c, 14d). The surface (14) is adapted to be moved vertically. The device further comprises a vacuum feeder (16) for feeding papers from their position on the storage surface (14) and imparting on an uppermost sheet of paper (12a) a horizontal displacement, and a blower arrangement (18, 20) adapted to provide a curtain of air separating the uppermost sheet of paper (12a) from the rest of the stack of papers. The device further comprises a sensor arrangement (22) arranged to determine where the upper paper sheets in the stack of papers (12) start to separate from the rest of the paper sheets, the sensor arrangement (22) comprising a plurality of infrared reflective sensors (22a).

Abstract: A paper feeding device comprises a storage surface for a stack of papers and being adapted to be move vertically between a first, lower end position and a second, upper end position, and a feeding roll for feeding papers from their position on the storage surface and imparting an uppermost sheet of paper a horizontal displacement. A first mounting device comprises a first vertically movable, preferably pivotable housing adapted to mount or suspend a first end of the feeding roll, and a second mounting device comprises a second vertically movable, preferably pivotable housing adapted to mount or suspend a second end of the feeding roll opposite to the first end of the feeding roll. By providing the first and second housings pivotable independently of each other and an intermediate axle, the feeding roll adapts to a non-uniform stack of papers, improving the reliability of the feeding.

Abstract: A method for feeding sheets of paper comprises the following steps: providing a stack of papers on a storage surface of a paper feeding device; providing a flow of air for separating an uppermost sheet of paper from the rest of the stack of papers; determining the vertical position of the uppermost sheet of paper; adjusting the flow of air in dependence on the determined vertical position of the uppermost sheet of paper; and repeating the steps of determining the vertical position of the uppermost sheet of paper and adjusting the flow of air in dependence on the determined vertical position of the uppermost sheet of paper. During continuous operation, the flow of air is controlled in cycles with one part of the cycle, preferably the first part of the cycle, with a higher flow of air, and one part of the cycle, preferably the second part of the cycle, with a lower flow of air.

Abstract: A paper feeding device comprises a storage surface for a stack of papers and being adapted to be move vertically between a first, lower end position and a second, upper end position, and a feeding roll for feeding papers from their position on the storage surface and imparting an uppermost sheet of paper a horizontal displacement. A first mounting device comprises a first vertically movable, preferably pivotable housing adapted to mount or suspend a first end of the feeding roll, and a second mounting device comprises a second vertically movable, preferably pivotable housing adapted to mount or suspend a second end of the feeding roll opposite to the first end of the feeding roll. By providing the first and second housings pivotable independently of each other and an intermediate axle, the feeding roll adapts to a non-uniform stack of papers, improving the reliability of the feeding.

Abstract: A booklet making machine is provided, comprising a stapling arrangement (10) adapted for stapling a set of sheets, and a folding arrangement (30) adapted for folding a set of sheets following a paper path. At least one of the stapling arrangement and the folding arrangement comprises an adjustment device (12; 32) for adjusting the position of the set of sheets during operation of the booklet making machine. Thereby, the quality of the stapled and folded end products can be improved during operation of the booklet making machine, without interrupting the operation of any connected apparatuses, such as a printer.

Abstract: A booklet making machine is provided, comprising a stapling arrangement (10) adapted for stapling a set of sheets, and a folding arrangement (30) adapted for folding a set of sheets following a paper path. At least one of the stapling arrangement and the folding arrangement comprises an adjustment device (12; 32) for adjusting the position of the set of sheets during operation of the booklet making machine. Thereby, the quality of the stapled and folded end products can be improved during operation of the booklet making machine, without interrupting the operation of any connected apparatuses, such as a printer.

Abstract: A roller arrangement for booklet makers comprises at least a first (1) and a second (2) pair of rotatably driven rollers, between which booklets (4) are intended to pass successively for folding. The first pair of rollers comprises two rollers (1) that are arranged such that they can move towards and away from each other and having a spring loading towards each other, while the second pair of rollers (2) comprises two rollers with a mutual separation that can be adjusted. Mechanical means (3) are arranged to, following the insertion of a booklet between the rollers of the first pair of rollers, automatically adjust the mutual separation of the rollers of the second pair of rollers depending on the distance between the rollers of the first pair of rollers.

Abstract: A roller arrangement for booklet makers comprises at least a first (1) and a second (2) pair of rotatably driven rollers, between which booklets (4) are intended to pass successively for folding. The first pair of rollers comprises two rollers (1) that are arranged such that they can move towards and away from each other and having a spring loading towards each other, while the second pair of rollers (2) comprises two rollers with a mutual separation that can be adjusted. Mechanical means (3) are arranged to, following the insertion of a booklet between the rollers of the first pair of rollers, automatically adjust the mutual separation of the rollers of the second pair of rollers depending on the distance between the rollers of the first pair of rollers.

Abstract: A method and apparatus for automatically filling and sealing envelopes in a complete sequence starting with envelopes being placed in an initial position and terminating with filled envelopes being delivered fully prepared for being labelled and stamped. The novel feature is turning the envelopes from a position with their front sides facing downwards into a position with their reverse sides facing downwards, with the contents of the envelopes being introduced when they are in the last-mentioned position. In consequence of the invention a faster operating and considerably more compact apparatus can be attained than in the prior art.

Abstract: A sheet collating machine includes feed-up devices (7) disposed at bins (1) and having driven feed-up wheels (8), the feed-up devices being pivotal between a lowered position in which the feed-up wheels engage stacks (2) of paper sheets and a raised position in which the wheels are disengaged from the stacks. A conveying path (3) is defined by a plurality of conveyor and press rollers (4), along the upper side of which a corresponding number of backing rollers (6) are disposed, and a conveyor belt (5) runs between the rollers. A sensor (12) is actuated by a spring member (11) which extends crosswise over the conveyor path when no sheet protrudes between the press roller and the belt, and the spring member is lifted from its contact with the sensor when a sheet passes the latter. When no sheet is advanced within a predetermined period the sensor furnishes a signal to a control device which automatically causes a drive device to lift the feed-up device to its raised position.