CN1066418A

CN1066418A - Scanning/printing machine

Info

Publication number: CN1066418A
Application number: CN 92103804
Authority: CN
Inventors: 方岩; 刘强
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-05-28
Filing date: 1992-05-28
Publication date: 1992-11-25

Abstract

The invention discloses a kind of printer that makes existing output picture and text become can to the photo scanning input again can the printout dual-use function the technology implementation method of " scanning/printing machine ".Its principle is that photo-electric probe on the printhead moves with printhead and the paper feed that enters a new line is realized lining by line scan to picture and text by being contained in.Its exchanges data is undertaken by the parallel or serial line interface between scanning/printing machine and the computer.Realized the integrated of large format, the input of middle precision low speed picture and text and printout by common control circuit and frame for movement with low cost, for graphics process and literal identification provide a kind of popularization hardware platform.

Description

Scanning/printing machine

The present invention scans input technology with photo-electric and this picture and text output equipment of printer creatively combines, and makes move duplicate pin type and this picture and text output printing device of ink-jet printer of printhead motion and paper feed become this novel picture and text input-output apparatus of scanning/printing machine with picture and text input and output dual-use function.

Existing scanning loader generally adopts the CCD photoelectricity electric charge coupling linear array more than 1024, in inside is under the circuit control of core with the microprocessor, realize scanning to picture and text by the accurate mechanical transmission mechanism of a cover, data are generally sent into computer by plug-in card or serial line interface.And existing printer generally receives data by the parallel interface on the computer, contain under the microprocessor circuit control in inside, drive printhead transverse movement and vertical paper feed by motor and precision mechanical transmission, by print needle bump colour band or nozzle ink jet output picture and text.The two has similar control circuit and frame for movement as can be seen from last, and one is picture and text input and another is the picture and text outputs, and both combine and can reduce cost greatly, reduce number of devices and area occupied, and are easy to use, task of the present invention that Here it is.

The present invention is based on that following principle finishes: computer and scanning/printing machine be generally the parallel interface swap data (also can adopt serial port, but only need) by input buffering and output latch ability and contact handshake are arranged on the computer.Electromechanical structure and control circuit are all based on the most universal present 24 pin impact types or the similar ink-jet printer that moves.The probe of the photoelectric receiving transducer array that contains light source and vertically arrange is installed in and forms scanning/printing composite head on the printhead, and composite head links to each other with motherboard circuit by grout cable.When scanning print needle be failure to actuate, composite head moves once in the horizontal direction to the photo scanning delegation between marking roll and scan roller, then next line is scanned again in paper feed delegation.Line by line scan like this and can obtain width and depend on the printer line width, length depends on and is scanned picture and text, resolution ratio depends on the printer picture and text of step pitch and scanning sensor figure place and bit area in length and breadth, and sweep speed depends on printhead and paper feed movement velocity and sensor array length.The signal that scanning obtains is put into buffer storage by the mainboard microprocessor, gives computer by the interface on the printer through cable.Sweep test can not worked during printing, and the course of work is the same with existing printer.The present invention adopts the technical method that describes in detail below, and cost only increases by 1%～5% on existing printer basis, and use value doubles.

Below with reference to accompanying drawing technical problem of the present invention is further elaborated.

Fig. 1 is the structural representation of scanning/printing composite head among the present invention.

Fig. 2 is the schematic diagram of probe part among the present invention.

1) structural requirement of composite head:

With reference to Fig. 1, probe is positioned at the top of printhead, for fear of the CCD linear array of making arc, has set up a scan roller [1], is scanned picture and text [2] on plane between scan roller and marking roll [6], and probe [4] forms an angle with printhead [5], is beneficial to paper delivery.The scanning mouth should be too not far away from paper.

2) the probe scheme in the composite head:

With reference to Fig. 2, probe just forms light source [1] and photoelectric receiving transducer linear array [3] two parts of reflecting at paper [2] by angle and forms.Light source can adopt semiconductor laser, super bright light emitting diode and various novel light bulb, but black and white scanning is the most simple and reliable with super bright light emitting diode, and chromoscan can be used bulb.Can adopt linear array and CCD linear arrays such as photosensitive two, triode and photocell to the reception of light, be the best with the CCD linear array at present.Because present 24 needle printers positioning accuracy in length and breadth mostly are 1/180 or 1/360 inch (ink-jet printer mostly is 1/300 inch), the linear array figure place is good with 24,32,48,64, and bit is better with 0.141 * 0.141,0.141 * 0.07,0.07 * 0.07 area.The scanning seam needn't be too wide, and the light shield inwall is answered antireflective.

3) circuit requirement:

The output of CCD can be adopted pulse or parallel organization, and pulse output can receive with shift register at mainboard; And line output can realize by a plurality of 374 ternary latch and decoding circuit are made a chip with the ASIC form with CCD.Should add a slice 74LS374 to the printer that does not contain output circuit in the CENTRONIC interface exports.

4) additional function:

On probe, add near switch [3] with reference to Fig. 1, scanning paper bail two ends add a pair of can conveniently move and lock about define bit slice, can be easy to setting scanning/printing circle and improve bilateral scanning/printing precision.Also should be provided with scanning and print first-line sign, the paper feed key should be able to pursue the line stepping, is beneficial to aim at vertical start line.There is the type of off line hard copy function should join the above internal memory of 1M byte to hope.Increase some correspondent button on the panel.

5) machine inner control sign indicating number:

Increase the scan command group, to set sweep length, length, position, speed, mode etc.

6) cooperation of computer aspect development:

Increase and the similar scanner driver of print driver.Development graph is handled and software for discerning characters.Parallel interface inserts DMA when abdicating machine, is not subjected to the restriction of IBM PC/XT parallel port per second input 1K byte, strengthens real join internal memory and hard-disk capacity, for graphics process and literal identification provide good platform.

Claims

Scanning/printing machine is a kind of novel computer external equipment that photo scanning input and figure message printing output dual-use function are arranged.Feature of the present invention is that the electro-optical pickoff array is installed on the printhead, by transverse movement and vertical paper feed of printhead, finishes the input of lining by line scan to picture and text.