Abstract:
The invention concerns printing or copying equipment in which a sensor (CCD) is fitted at a point along the path of the print medium to detect the position of the print medium as it is moved. The position data are processed by a processor (UP). The processor (UP) controls a position-adjustment unit (SH). In the position-adjustment unit (SH), the print image provided by an auxiliary page-storage unit (MEP) is shifted as a function of the print-medium position data. The repositioned print image is output to a character generator (ZG). The invention ensures high accuracy and repeatability for the positional fit of the print image on the print medium.
Abstract:
A web-shaped printing medium is conveyed from the output area of an electrographic printing or copying machine (1) to the stacking device. The stacking device has a rider (7, 12) that receives the stack (15) in the area of the stacking surface on a centrally arranged receiving profile. A controlling device (HE) is associated to the rider (7, 12) to adjust the curvature of the receiving profile. A data entry unit (TAS) is further provided for inputting the height of the stack, as well as characteristic parameters of the printing medium (2), such as format and paper weight. The data inputted through the data entry unit are supplied to a controller (ST) that modifies the receiving profile of the rider (7, 12) by means of the controlling device (HE).
Abstract:
An electrophotographic printing or copying machine contains as image source a laser diode array (10) with a plurality of individually excitable laser diodes (11) arranged in a predetermined grid for forming an excitation pattern. A deflection unit (13) deflects the light beams from the laser diode array (10) and a projection lens arranged between the laser diode array (10) and the photoconductor (17) projects the excitation pattern of the image source without optical distortions onto the photoconductor (17) as a pattern of picture elements.
Abstract:
A device for transporting print media (12) in printing or copying apparatus has rotary transport elements (36) arranged in a print media transport channel at a distance from the print medium (12) that act as feeding aids for an automatic paper feeding device. Friction elements (40) designed as striking elements with friction surfaces (41) and arranged at the periphery of the transport elements (36) are bound to the axis bolt of rotation (38) of the transport element (36) so that they can swivel. When the transport elements (36) are rotated, the friction elements (40) are brought by the centrifugal force out of a rest position, against a restoring force, and their friction surfaces (41) are brought into frictional contact with the print medium (12) and transport the same. When the transport element (36) is at a standstill, the friction elements (40) release the print medium (12).
Abstract:
An electrographic printing device is designed to print recording media (10) shaped as tapes of various widths in various printing modes, such as one-colour and multi-colour simplex and duplex printing and simultaneous printing of two recording tapes in parallel. For that purpose, the units of the printing device, such as intermediate support (11), duplicating station (15) and fixing station (18), have a useful width at least twice the width of a narrow recording medium. The printing device further has a deflecting device (28) downstream of the fixing station (18) which may be switched on if required and to which is associated a return channel to the duplicating station (15). The recording medium (10) is turned and supplied back to the duplicating station (15) through said return channel in the one-colour and multi-colour duplex printing modes.
Abstract:
In a system having modules (20), power supply (15), signal transmision via closed signal lines (13) and signal earthing (14), the impedance of the signal lines (13) is equal with respect to both the signal earthing (14) and the power supply (15), with the contacts for signal earthing and power supply being coupled in alternating current on the modules and near the end of the signal lines.
Abstract:
An automatic cheque issuing device used as a document printer contains a device for print monitoring (GS, AE). The print monitor makes it possible to print a print monitor symbol (15) in a blank section of the document (12) when the latter is printed. This print monitor symbol (15) is scanned by means of a light barrier (26), which is used to place the documents (12) in a printing position, and checks the presence and condition of the print via a program-controlled assessment unit (AE). It is thus possible to monitor the operation of the printing mechanism of the printing device and ensure that only printed and checked documents (12) are produced by the automatic document issuing device.
Abstract:
A document processing device, especially a document printer (10, 110) with a document issuing section having a slot-like document issuing aperture (28) and a downstream document support (16, 116) in the document issuing direction. On the document support (16, 116) there is a region (50, 150) parallel to the document issuing aperture (28) which prevents a ticket from sliding and projects beyond at least parts (42, 142) of the document support (16, 116).
Abstract:
The separating agent metering device (30) contains a separating agent feed roller (1), which rolls off tangentially on the fuser roller (8). In the process the separating agent coming from the inside to the surface of the separating agent feed roller (1) is transferred onto the fuse roller (8). The separating agent feed roller (1) contains a support tube (6) rotatably mounted on a separating agent metering tube (5) and has a replaceable application roller (7) arranged thereon. Having an applicator core (4) with an attaching layer of material (13) that is permeable to the separating agent, the application roller (7) can be slid axially over the support tube (6).
Abstract:
A developer station for an electro-photographic printer or copier has a developer chamber (12), a mixing chamber (13) and a developer station basin (14) connected to both chambers. Two developer mixture circuits are generated in the developer station, viz: one circuit to accept fresh toner and one for the actual development in a developer slit (18). A paddle roller (37) arranged in the developer station basin (14) generates a vortex in the mixture in the outlet region of the mixing chamber (13) which is enriched with fresh toner and is taken from the continuous developer mixture for the development process. The vortex essentially acts as a buffer store to compensate for heavy toner requirements in development and, in conjunction with the mixing chamber (13), for the tribo-electric activation of the developer mixture.