Abstract:
In order to reduce power losses and to protect and hence increase the service life of a vacuum-tube screen device with a stand-by control function, the filament current (Ih) to the screen heater (Hh) is reduced and the beam-deflection unit (VA, HA) in the vacuum-tube (BR), as well as the video amplifier (VV), are switched off. At the same time, the cathode (K) and a given electrode (G2) in the vacuum-tube (BR) are supplied with a given amount of power. During intervals between use of the device, a significant reduction in power consumption results, while the instantaneous-picture capability is maintained and the risk of cathode poisoning is avoided.
Abstract:
A thermal print fixing station for electrophotographic printing devices contains a heating roller (12) with a core of heat-conductive material which is surrounded, at least in a contact region with the substrate (11), by a heat-resistant, toner-repellant coating (16) of PTFE. 10 to 25% wt of graphite particles are embedded in the coating (16). A pressure roller (14) spring-loaded against the heating roller (12) has an elastic outer coating. There is a cleaning device with a doctor roller (20) and doctor blade (22), separate from a lubrication device (19), to remove particles of dirt adhering to the heating roller (12).
Abstract:
An electrophotographic printing device for the simultneous printing of both sides of a substrate contains two printing modules (10/1 and 10/2) with appropriate electrophotographic processing means (11 to 15) which are secured opposite each other in the printing device in such a way that a conveyor channel (25) for the substrate (21) is opened between the printing modules (10/1 and 10/2). The substrate (21) is guided over conveyors in the form of pairs of rollers to that its front and/or back can be brought into contact with the appropriate intermediate substrate (14) of the appropriate printing module (10/1 and 10/2). The pairs of rollers used are the reversing rollers for the intermediate substrate (14) co-operating with a counter-roller (23) or the opposed reversing rollers (22) for the intermediate substrate (14).
Abstract:
A parallel interface is disclosed for connecting data processing machines to each other or to peripherals, in particular for connecting a personal computer to a printer. The parallel interface has two status information lines, disconnectable line drives and control lines (SLCT, SLCTIN). For a predetermined direction of data transmission, the beginning of data transmission at the emitting machined is signalled on a first control line (STBN) in a predetermined direction of data transmission and the end of data transmission at the receiving machine is signalled on a second control line (ACKN). In order to achieve a high transmission speed bidirectional interface, both status information lines (SLCT, SLCTIN) are able to disconnect the line driver of the machine which is at the receiving side at any given moment, switching over the data transmission direction. Once the data transmission direction has been switched over, the second control line (ACKN) at the now emitting machine is used in the same way as the first control line before the data transmission direction was switched over, and the first control line (STBN) of the now receiving machine is used in the same way as the second control line before the data transmission direction was switched over.
Abstract:
An electrophotographic printer or copier with an illumination correcting device for the optical character generator (ZG) contains means, e.g. a filter (FT), to compensate for the wavelength-dependent light sensitivity of the charge image substrate (FL) by controlling the lighting energy of the lighting devices (LED) dependently upon the wavelength of the light emitted by them and the light sensitivity of the charge image substrate (FL). This prevents the formation of undesired colour differences in the form of stripes when colouring large areas.
Abstract:
A printer or copier working according to the transfer printing process has an arrangement for printing the front and/or the back of a recording medium (29). The arrangement has a photoconductive drum (10) and a thermoadhesive transfer band (12) coupled to the photoconductive drum. A transfer printing and fixing station (18) associated to the transfer band (12) has a fixing gap (23) on the one side of which is arranged the transfer band (10) and on the other side of which is arranged a transfer printing and fixing element (22) designed as a heated transfer printing roller. The transfer band (10) and the transfer printing and fixing element (22) are elastically supported on each other. In order to print at the same time the front and the back of a recording medium (29), a first toner image (39/1) associated to the back of the recording medium (29) and a second toner image associated to the front (39/2) of the recording medium (29) are generated on the photoconductive drum and transferred in this order to the transfer band (12). The heated images heated to a pasty state are brought to the fixing gap (23). The heated transfer printing and fixing roller (22) takes up at first the toner image (39/1) of the back side. Then the recording medium (29) is brought to the fixing gap (23) and the transfer band (12) and the printing roller (2) turn on the individual sheet (29), transferring and fixing at the same time the toner images on both sides of the recording medium.
Abstract:
The innovation relates to a flat module composed of a printed circuit board upon the surface of which are mounted housing-free components with an elastic pressure member arranged between the printed circuit board and the components. In order to achieve an adequate cushioning effect, the thickness of the elastic pressure member must be correspondingly set. Consequently, the Z-flexure of the contact pad is higher than actually required to compensate the thermoelectric voltage. In order to avoid this disadvantage, recesses are shaped in the surface of the printed circuit board, in which the pressure members are laid, thus reducing the range of tolerance in the surface soldering area.
Abstract:
Digitally coded signal value (SWY, SWM, SWC, SWK) separated according to the colour intensities (IY, IM, IC, IK) of colour pixels of a pattern (V) are converted by the process and device by means of sets (k) of conversion matrices (KMY, KMM, KMC, KMK). The converted signal values (SWY, SWM, SWC, SWK) are then arranged in lines and columns with the aid of a modulo calculation for a colour print (Y, M, C, K) in a graphic format (GFY, GFM, GFC, GFK) in such a way that a screen angle for the colour print (Y, M, C, K) concerned is set in line and column-overlapping combination of the converted signal values (SWY, SWM, SWC, SWK).
Abstract:
For the purposes of the recording and reproduction of data and command protocols in EDP system (2) peripherals, e.g. high-powered electrophotographic printers, a storage device (3, 104) is arranged in the peripheral (1) and connected to a central unit (100) of a control device (10) of the peripheral (1) via bus system (101). The storage device (3, 104) can thereby take the form of a micro-computer (3) with an internal hard disc store (30) which is connected to the central unit (100) of the peripheral (1) via a bidirectional parallel interface (103) or of an internal mass store (104) of the peripheral (1).
Abstract:
A dispenser for sheet material, especially notes, consists of a storage container (14) for a stack of sheets (12), an extraction and separation device allocated to the storage container (14) with at least two extractor rollers (18) at an axial distance apart intended to bear on the sheet (22) to be extracted from the stack of sheets (22) and a swinging shaft (42) parallel to the plane of the sheets and bearing the extractor rollers (18). Said shaft consists of a tubular body, the central section of which is borne with radial clearance via a universal joint (48) on a drive shaft (20) transfixing it longitudinally and rotatably joined with it, whereby the drive shaft (20) is fitted in bearings fixed in position in relation to the storage container (14). The hollow body is adjustably guided between tines (70) of a guide fork (72) directed perpendicularly to the plane of the sheet.