CN1291546A

CN1291546A - Self-driven wireless printing head

Info

Publication number: CN1291546A
Application number: CN 99126978
Authority: CN
Inventors: 赵舜培
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-12-23
Filing date: 1999-12-23
Publication date: 2001-04-18

Abstract

A wireless self-driven printing head is composed of buffer memory for storing the data to be printed on at least one line, motor to drive the printing head along track and power supply connector. For its implementation example, said guide track is two parallel metallic tracks connected to power supply and the printing head is a carriage with 4 metal wheels, one pair of which has an axle with brush connected to power supply.

Description

Self-driven wireless printing head

The present invention relates to a kind of printhead of printer, especially the printhead of ink-jet printer.

In recent years, ink-jet printer extensively is invested in printer market with its good print quality and cheap price.In addition, because laser printer is fit to small-sized business and the user of family uses, so in some large-scale printing projects, it is more suitable that ink-jet printer seems.

The ink gun of traditional ink-jet printer is installed on the print cartridge, and print cartridge is moving around in wide zone with printing paper, and delegation of delegation finishes printing.This print cartridge comprises ink gun, can spray mass colour, also comprises the parts of heating to institute's ink-jet look, paper inductor, and the position sensor of detection print cartridge position (with respect to the position of printer main body and printing paper).

The control signal of the printhead of this ink-jet printer, illustrate that where all what print cartridge printed and be printed on is the input that relies on external resource (for example PC), cable by a softness between this computer and the printer is connected, cable is transported to ink-cases of printers with print command, the printhead inkjet printing.According to the quantity of the inkjet mouth of print cartridge, this cable is made up of the independent electric wire of a lot of bars, almost wants 50 to 60, even more.So common way is that they are tiled side by side, this looks cable is a wide and flat flexible cord.

But this cable is relatively more expensive, again because it connects the mobile print head, enough length must be arranged, and printer will stay sufficient vacant lot side so that allow cable unhinderedly move around, and this must enlarge the printer volume, causes the increase of printer cost.

There is a more difficult problem in this pliable and tough cable, and every independently electric wire is all very thin, thereby fractures easily, and particularly when printhead moves around, they can be crooked, and frangibility more.And all necessary conductively-closed of every wire is in order to avoid interfering with each other, and shielding wire certainly will also can increase the cost of printer.

U.S. Pat .5567063 discloses a kind of solution to the problems described above, promptly adopts wireless signal transmission in the printhead control system, has saved cable.Invent in the described printhead at this and to be provided with internal storage, it has enough storage volumes to store the print data of delegation at least, and this memory can be collected up-to-date print data immediately after printhead is finished each line printing.

However, the disclosed invention of US.5567063 still can not solve all problems fully.Inventing described printhead as this is to drive a belt by motor, is moved around by this belt drive printhead and finishes printing.This structure has occupied the space of printer, and the volume of printer is increased, and has equally also increased the cost of printer; And needing independently the power cable line to provide energy to drive printhead prints.

It is less that purpose of the present invention aims to provide a kind of body, and designs simplification is printed freely printer with low cost.

Printer of the present invention comprises: dress paper equipment, printhead guider, printhead (comprising the equipment that extracts energy), motor and driving arrangement and the device that energy is provided.Self-driven wireless printing head of the present invention is not to drive belt drive printhead by motor to print, neither lean on cable to connect printhead and print, but lean on the driving arrangement of himself, energy is provided, utilize being connected between printhead and the guider, realize printing.

The present invention is particularly suitable for being applied to U.S. Pat, and in 5,567, the 063 described wireless printing head, still, the printhead in the printer of the present invention is a self-driven wireless printing head.This printhead comprises: guider and motor.This printhead drives without belt, and the power cable line that also need not connect printhead is carried signal, and under himself motive driving, prints.

Described guider comprises the metal guided way of pair of parallel, the printhead that wheel and motor are housed.Wheel is to be made of metallic conductor, and printhead relies on wheel to move to and fro on the metal guided way, when guided way is switched on, guided way contacts with metal wheel, and circuit is switched on, the motor rotation, drive wheel-mounted printhead and on guided way, move to and fro, print.

By above to analysis of the present invention as can be seen: printer of the present invention comprises one through improved printhead, and this printhead comprises: guider and motor apparatus, this printhead prints in the guiding of the driving force lower edge of motor guider.

Further specify printer of the present invention below in conjunction with drawings and Examples.

Schematic diagram when Fig. 1 is in initial state for the printhead of printer of the present invention;

Fig. 2 is consistent with Fig. 1, the schematic diagram when being this printhead by printing paper;

Fig. 3 is similar with Fig. 2 to Fig. 1, is the perspective view to the printhead end structure;

Fig. 4 is the detail exploded view of printhead;

Fig. 5 is power circuit figure;

Fig. 6 is the synchronous operation figure of printhead;

Fig. 7 has described the circular chart of printing delegation;

Fig. 8 is the data module schematic diagram of motor control system.

In the above-mentioned accompanying drawing, Fig. 1-3 has described printer of the present invention, and Reference numeral 1 refers to the printer body, and Reference numeral 2 is coil paper rods, and the 3rd, ink gun, coil paper rod 2 is by driver 4 (Fig. 3) control running.Reference numeral 5 is a dolly, and 6 is four wheels of this dolly, and ink gun 3 just is installed on this dolly.Reference numeral 7 is the guided way of two parallel metal quality, and its end links to each other with power supply.Reference numeral 8 (Fig. 3) is a power lead, and in described embodiment, they are connected with guided way.Wheel 6 also is to be made of metal, and in the present invention, they play a part to extract energy from guided way.It is to be noted, lorry comprises an electro-motor, and electro-motor relies on electronic rail that energy operation is provided, and also comprises turning gear wheels, this gear train promotion wheel 6 turns round to and fro and impels lorry to move to and fro on guided way 7, prints.Printhead 3 can rely on cable to carry the instruction of print control unit in principle, print, but in the present invention, printhead includes internal memory buffer, and internal memory buffer can store delegation's print data at least.When dolly turned back to its " terminal point " position, the print data of delegation that this store buffer is downloaded and the storage print head is printed or two row passed to printhead by data transmission point 9.The data transmission point 9 of printhead of the present invention has been continued to use some feature of U.S. Pat .5567063.

In Fig. 4, Fig. 5,10 is the metal shaft of trundle, and 11 is brush, and in Fig. 5, each wheel of dolly all is furnished with metal shaft, and metal shaft is connected with brush.Owing to exist electromotive force between the described guided way, this electromotive force is used as the power supply transmission by brush, thereby the motor 12 in the unlatching dolly, the brush circuit here indicates: power supply described herein is very responsive to noise and interim power interruptions, can reduce print quality in theory, in order to improve print quality, embodiments of the invention provide a kind of smoothing circuit.As shown in Figure 5.This smoothing circuit comprises filter 13, works to reduce mechanicalness noise; Also comprise capacitor 14, power interruptions is played repair, Reference numeral 15 is a rechargeable battery, and is longer in the interim power interruptions time specially, uses when capacitor is short of power.Reference numeral 16 is a calibrator, and 17 is transformer.

Among Fig. 4, Reference numeral 19 is a gear train, and this gear train relies on the power that is installed in the motor 12 on the lorry to drive wheel and moves along guided way.Specifically, a pair of wheel in the front of dolly serves as the effect that dolly moved and extracted energy of ordering about.The a pair of wheel in the back of dolly then serves as induction system and surveys the speed that dolly moves.This induction system includes rotating disc 20 (Fig. 6), and rotating disc 20 is fixed on the hind axle, and optical pickocff can detect this rotating disc, measures the speed of dolly and the number of turns that wheel shaft turns over thus, and then grasps the range ability of dolly.

In Fig. 1, Fig. 2, Fig. 3 and Fig. 6, Reference numeral 22 is position indicator (grating), and it is arranged along the inboard of printer casing, and parallel with guided way 7.Optical identification sign indicating number or electromagnetism identification code are arranged on the described grating, and this grating provides position signalling with position sensor 21 to printhead.Described position sensor can be optical pickocff, electromagnetic sensor or other similar sensors.Certainly, the information of position sensor is to be provided by grating.Reference numeral 23 is " terminal point " position indicator, and when dolly arrived " terminal point " position, the final position indicator sent indication.Velocity sensor, position sensor and " terminal point " position sensor provide dolly the Position And Velocity data, the feedback of these data and the running of printhead are synchronous.Specifically describe as follows:

Fig. 8 is the data module schematic diagram of the control system that moves of control printhead.This control system comprises: the direction logic device 30 of beginning/termination, it controls the electric current of supply orientation rail by motor speed controller 31, thereby controls speed and the direction that printhead moves.The data-signal that logic device 30 assembling position sensors 21, " terminal point " position indicator 23 transmit.Its also collects simultaneously computer control printer and the initial control data signal imported.These data-signals comprise: original position signal, printing paper and print span signal etc.Logic device 30 output signals are controlled the speed of motor and the direction of rotation by motor controller, and the signal that motor controller is collected comes from velocity sensor 20 feedbacks.

Among Fig. 7, T1 and the data that produce between this section of T2 period download in the buffer of printhead, and this has followed the disclosed mode of U.S. Pat .5567063.Being motor of the present invention between T2 and the T3 reaches the process of constant speed from inactive state, is that motor reaches constant speed and prepares to accept print signal, the preproduction phase that begins to print between T3 and the T4.Thin film circuit in the printhead passes to ink gun with the print command that position sensor sends, and prints.As seen from the figure, during printing, the pulse of position and velocity sensor output is fully synchronous.When the last position that runs to print wire when ink gun was put, motor was parked in the T5 point, and according to the instruction that position sensor provides, motor changes direction, drives the dolly correcting action, and dolly can carry out the printing of next line in return course in the same way.If print area is less, then prints and to carry out in one direction.

Printer of the present invention is compared with traditional printer and is had many good qualities, and it has omitted cable and skin Band can reduce cost, and saves the printer space; Motor is contained in the printhead dolly, realized printhead Self-driven. These advantages are more suitable for being used on the very wide printer of printing amplitude. The in addition modularization of printhead Design more is conducive to assembling and maintenance; Also be conducive to the replacing of ink gun; A plurality of ink guns are all right simultaneously Use simultaneously.

Claims

1. printer, the paper feed port that comprises printer, the printhead consistent with this paper feed port direction, it is characterized in that: described printhead has guider, this guider instructs ink gun printing on wide common direction with printing paper, described printhead comprises the equipment that extracts energy, motor and drive unit, and power supply provides power for described guider.

2. printer according to claim 1 is characterized in that: this guider comprises the guided way that pair of parallel equidistantly distributes, and this guided way is that conductive metallic material is made.

3. printer according to claim 2 is characterized in that: on the printhead dolly, 4 metallic wheels that adapt with described guided way are arranged.

4. printer according to claim 3 is characterized in that: have at least in the described wheel brush that combines with described motor and power supply has been installed on two wheels.

5. printer according to claim 1 is characterized in that: described printhead comprises a position sensor.

6. printer according to claim 5 is characterized in that: the described position sensor position indicator of described printer is by reference surveyed the position of described printhead.

7. printer according to claim 1 is characterized in that: described printhead comprises a velocity sensor.

8. printer according to claim 7 is characterized in that: described printhead dolly wheel all has wheel shaft to connect, and described velocity sensor can detect the rotation situation of this wheel shaft, thereby obtains the speed parameter of dolly.

9. printer according to claim 1 is characterized in that: described print data comprises data such as synchronous print speed and print position.

10. printer according to claim 1, its printhead also comprises controller for motor, be used for controlling the speed of described motor and direction of rotation and provide the equipment of initial data to described motor, it is characterized in that: this controller for motor can receiving position sensor and the twinkling signal about print head position and speed of velocity sensor input.

11. self-driven wireless printing head of the present invention moves at printing paper upper edge guider, it is characterized in that: motor is installed in this printhead inside, directly provides the power drive printhead to move along the guiding of guider internally.