Abstract: For transporting finely powdered toner material from a reservoir to a delivery opening, a porous bed that forms a down grade is charged with compressed air proceeding from below, whereby the toner material mixes with air to form a liquid-like mixture. This mixture flows along the down grade from the reservoir to the delivery opening.

Abstract: A method for operation of a printing mechanism in an electrographic printer or copier, whereby a charge image is applied at a surface region of a toner image carrier. The surface region provided with the charge image is conveyed past at the transfer surface of a transfer element at a spacing of a developing gap. The actual width of the gap is controlled with a loop control circuit.

Abstract: An electrophotographic printer has an electro-thermally operating fixing station (23) with a heated fixing roller (86) and a feed roller (87) which can be pivoted on and away. With the aid of an unheated, pivoting paper guide saddle (93), the reel paper is guided around the fixing roller (86) at a predeterminable wrapping angle (U) for the purpose of preheating before the actual fixing. In order to fix the printed image on the reel paper (12) in an offset-free and smudge-free manner during the starting and stopping process, the movements of the elements of the fixing station (23) and the transport of the paper are coordinated in such a way that there is no relative movement between the fixing roller (86) and toner image on the reel paper (12) when the reel paper is placed against the fixing roller (86) and when the reel paper (12) is stripped off the fixing roller (86).

Abstract: A printer for selectively printing on one or both sides of a web-shaped recording medium includes a paper turn-over apparatus in the paper conveying channel. The turn-over apparatus is a removable unit and can be changed from a turn-over operation for two sided printing to a parallel conveyance for one sided printing of two recording mediums. A conveyor that moves the recording medium through the printer has an adjustable width to adapt to different recording medium widths. The conveyor includes a return which returns the recording medium to the turn-over apparatus after being printed on one side. The return includes a traction roller pair and a lever to swivel one of the rollers in and out. A connecting channel leads from the traction rollers and includes guide baffles. Conveyor rollers are arranged along the connecting channel at less than the spacing of the folds in the folded recording medium.

Abstract: A printing station includes pins for engaging into edge perforations of continuous paper. The pins are mounted on a toothed belt at the gaps between the belt teeth. A two part pin mounting has a portion engaged between the teeth of the belt.

Abstract: An electrophotographic printer device for both-sided printing of a tape-shaped, narrow recording medium (10) and for single-sided printing of a wide recording medium or a plurality of parallel, narrow recording media (10/1,10/2,10/3) contains a printer module that is designed for printing recording media differing in width. A delivery module and a turn-over module (28) are removably arranged in the printer module, the narrow recording medium (10) being turned over after the printing of the front side and being reconducted through the printer module for printing the back side via said delivery module and turn-over module.

Abstract: In a thermal fixing system for fixing toner images on the front side of a recording medium in an electrographic printer or copier device, wherein the back side of the recording medium can already have a fixed toner image. The thermal fixing means contains a heat transfer fixing station that fixes the toner images on the recording medium, and contains a pre-heating saddle that precedes the heat transfer fixing station in a running direction of the recording medium. A sliding surface that accepts the recording medium over its back side is allocated to the pre-heating saddle. The sliding surface is constructed of a toner-repellant material at least in a contact region with the recording medium. The preheating saddle is designed as a low temperature saddle with the largest possible constructional length, so that a temperature difference between recording substrate and saddle surface is as small as possible. The preheating saddle has, in the recording substrate running direction, a plurality of heating zones.

Abstract: An electrographic printing or copying machine contains, by way of example, a preheating saddle (20,21) positioned upstream of a pair of fixing rollers in the recording substrate running direction and a braking element (10). The preheating saddle (20,21) and braking elements (10) form a gliding surface (23). Suction openings (18,19) in fluid communication with a vacuum-generating device ensure good contact between gliding surface (23) and recording substrate. With the aid of a valve (1), the vacuum can be matched to the operating parameters of the printing and copying machine, or to the parameters of the recording substrate.

Abstract: A thermofixiug device for fixing toner images on a strip-shaped or sheet-like recording substrate (17) of an electrophotographic printing or copying machine contains a thermoprinting fixing station (11, 12) and a heated preheating saddle (15) located upstream of the thermoprinting fixing station in the recording substrate running direction. The preheating saddle (15) is designed as a low temperature saddle with the largest possible constructional length, so that the temperature difference between recording substrate (17) end saddle surface (24) is as small as possible. The preheating saddle has, in the recording substrate running direction, a plurality of heating zones (21, 23). A control device controls the heating zones (21, 23) in such a manner that, along the preheating saddle (15), an approximately constent thermal energy flow occurs on the saddle surface (24) to the recording substrate (17).

Abstract: A printing or copying apparatus is provided having a thermofixing device for fixing a toner image to a sheet recording medium or substrate, such as paper. The apparatus has at least one cooling device operable to cool the substrate after it passes through the thermofixing device and before the substrate is stacked. The cooling performed by the cooling device prevents the toner image from undesirably sticking to an adjacently overlying substrate surface after stacking.

Abstract: In a thermal fixing system for fixing toner images on the front side of a recording medium in an electrographic printer or copier device, the back side of the recording medium already having a fixed toner image. The thermal fixing means contains a heat transfer fixing station that fixes the toner images on the recording medium, and contains a pre-heating saddle that precedes the heat transfer fixing station in a running direction of the recording medium. A sliding surface that accepts the recording medium over its back side is allocated to the pre-heating saddle. The sliding surface is constructed of a toner-repellant material at least in a contact region with the recording medium. A separating device can separate the recording medium from the saddle.

Abstract: An electrophotographic printer for printing on front & rear sides of reel paper has an electro-thermally operating fixing station (23) with a heated fixing roller (86) and a feed roller (87) which can be pivoted between at least one position against the fixing roller and another position away from the fixing roller. With the aid of an unheated, pivoting paper guide saddle (93), the reel paper is guided around the fixing roller (86) at a predeterminable wrapping angle (U) for the purpose of preheating before the actual fixing.

Abstract: An electrophotographic printer has an electro- thermally operating fixing station (23) with a heated fixing roller (86) and a feed roller (87) which can be pivoted between at least one position against the fixing roller and another position away from the fixing roller. With the aid of an unheated, pivoting paper guide saddle (93), the reel paper is guided around the fixing roller (86) at a predeterminable wrapping angle (U) for the purpose of preheating before the actual fixing. In order to fix the printed image on the reel paper (12) in an offset-free and smudge-free manner during the starting and stopping process, the movements of the elements of the fixing station (23) and the transport of the paper are coordinated in such a way that there is no relative movement between the fixing roller (86) and toner image on the reel paper (12) when the reel paper is placed against the fixing roller (86) and when the reel paper (12) is stripped off the fixing roller (86).

Abstract: The device for transporting recording media (100), used especially in a fuser station of a printer or photocopier, comprises a counter-roll (201) and a feed roll (205), mounted movably relative to the counter-roll (201), between which rolls the recording medium (100) is transported by friction. Furthermore, a guide bar (214) is arranged in the manner of a balance beam with spacing parallel to the feed roll (205) and so as to be pivotable about an axis of rotation (216) relative to the feed roll (205). In order to press the feed roll (205) against the counter-roll in a force-compensating manner, as required, spring elements (218) are arranged on the guide bar (214) on both sides of the axis of rotation and are coupled to bearing elements (206) of the feed roll (205). The guide bar can be deflected via an adjusting motor (224) for controlling the position of the recording medium (100) between the rolls (201, 205).

Abstract: An arrangement for the lateral positioning of a recording medium (100) in a printer or photocopier comprises a scanning arrangement (S) for establishing the ACTUAL position of the recording medium and a motor-drivable roll arrangement consisting of a counter-roll (201) and a pressure roll (205) which can be pivoted onto and away from the counter-roll (201), between which rolls the recording medium is guided. Furthermore, an apparatus (E) is provided for the controllable adjusting of the pressing force at the feed roll (205) on the counter-roll (201) along its roll length, and a control arrangement (P) which registers the ACTUAL position of the recording medium (100) via the scanning arrangement (S) and adjusts the pressing force of the feed roll (205) via the said apparatus (E) as a function of a predeterminable REFERENCE position. The arrangement is used preferably in the fuser station of an electro-photographic printer for the controllable lateral positioning of the recording medium (100).

Abstract: A variable piston arrangement is provided which is especially adapted for use in roll and bread dividing and shaping machines and includes one or more separate pistons each selectively and operably arranged in a single piston-housing used to size and shape baking dough to predetermined specifications. The piston-housing itself is disposed in a separate housing and as such may function as a separate piston in the following manner. Each of the separate pistons and piston-housing are arranged and controlled so that at least partial removal or withdrawal of one or more of the separate pistons from the piston-housing or withdrawal of the piston-housing from the separate housing will produce a predetermined vacated area or space which conforms to the size and shape of the rolls or bread to be baked.

Abstract: A device for arc welding having one or more fusible electrodes (15) which are in each case supplied from an alternating-current source (14) having a falling characteristic. The feed rate of the electrode (15) is regulated for constant arc length as a function of the arc voltage. Via a further regulator (37), the deposition efficiency is regulated by supplying the regulator (37) with the feed rate as actual value and changing the welding-current intensity as a function of this value. The change in welding-current intensity leads to an increase or decrease in arc length which, in turn, is compensated via the first regulator by changing the feed rate.

Abstract: Developer mix is regenerated in a manner which removes toner crust from carrier particles in order to extend the useful time of a developer mix within a developer station of an electrophotographic printing or copying machine. A portion of developer mix is continuously or periodically removed from the main body of developer mix in the developer station and supplied to a regenerator device where the developer particles are exposed to impacts flaking off the toner crust formations. The regenerated developer mix is then recycled back to the main body of mix at the developer station. This regeneration and recycling of developer mix serves to hold substantially constant the efficacy of the developer mixture.

Abstract: In a developer station for an electrophotographic printing or copying machine, there is provided apparatus which effects a more reliable uniform inking of charge images contained on a charge image carrier and which prevents spotting of printed images due to the unintended presence of carrier particles on the charge image carrier. The apparatus includes an evacuator device disposed at the air gap between the developer drum and charge image carrier preceding the inking gap formed therebetween for removing toner deposits which may accumulate at that portion of the developer station housing. A magnetic drum is disposed at the carrier exit end of the station housing for removing carrier particles from the charge image carrier which may have unintentionally become attached to the carrier surface in the area of the inking gap.

Abstract: A central drive system for a nonmechanical printing or copying device such as a photocopier has a central drive system with one motor which is subdivided into a main drive system with high precision for driving elements requiring a high degree of synchronization and a subsystem with less precision for driving elements requiring a lesser degree of synchronization. The main drive system drives the photoconductor drum, the slide scanning roller and a feed crawler in the paper transport unit. The subsystem drives a cleaning brush, the developer roller and mixing screws in the developer station.