CN2354748Y - Improved bill printer - Google Patents

Abstract

The utility model relates to an improved bill printer. The utility model is characterized in that the printer is additionally provided with a step motor and a corresponding driving mechanism; the driving mechanism drives a paper running mechanism to complete the paper running action and the line changing action in small spacing. The utility model can cause the paper running mechanism of an ordinary nine-pin bill printer to be controlled by the additionally provided step motor combined with software; each Chinese character is printed twice. The utility model can use the common cheap nine-pin printer core to print high-quality 16 * 16 lattice Chinese characters. Compared with the existing art, the utility model has the advantages of simple structure, low price, high definition of the printed Chinese character, compact lattice arrangement and proportional and beautiful font.

Description

A kind of improved bill printer

The utility model relates to a kind of printer Design technology, particularly a kind of a kind of improved bill printer that improves the Chinese character printing quality.

Bill printer is as the special peripheral apparatus of a kind of computer, and because of its volume is little, function is complete, and the characteristics that price is low win the favor of numerous domestic businessman, have obtained extensive use.Bill printer all is a dot matrix printer generally, contains the organic frame casing, prints draw point, the printhead stand, paper advance mechanism, colour band transmission mechanism, direct current generator, control circuit boards etc. by the printing draw point what, have seven pins, nine kinds of needles, 16 pins, 24 needle printers at present.The corresponding operatings such as line feed paper feed of ordinary bill printer prints colour band, printhead stand and paper advance mechanism all provide power to control by direct current generator.Because the miniature bill printer of domestic manufacturer's development mostly is the graphic printing function of the common nine kinds of needles printhead of direct usefulness Chinese character is carried out dot lattice printing, be example for example with NSK Epson printhead EPSON M-780 or M-U311S, its printhead is the single-row arrangement of nine kinds of needles, spot diameter is 0.29mm, dot spacing is 0.35mm, when printing a Chinese character, prints first row of chinese character dot matrix earlier, then print secondary series, so successively each row has been beaten.M-780 printhead prints Chinese character dot matrix is 9 * 16, because dot spacing is bigger, and spot diameter is relatively very little, and therefore the chinese character dot matrix that prints is very sparse, arrange compact inadequately, character sharpness extreme difference and seem very ugly.Though the nine kinds of needles bill printer that has in addition also can be printed 16 * 16 dot matrix Chinese characters, but its Chinese character that prints obviously has the vestige of piecing together, because this bill printer is that Chinese character is splitted into two halves up and down when printing Chinese character, the first half of Chinese character is printed in beginning earlier, then prints the latter half of Chinese character again.Be example still with the M-780 printhead, when printing a Chinese character, earlier this Chinese character is divided into 9 * 16 dot matrix and 7 * 16 dot matrix two parts up and down, the delegation of beginning prints 9 * 16 dot matrix (top) earlier, 7 * 16 dot matrix (lower part) are printed in line feed more then, because character height is 3.10mm, line-spacing is 4.75mm, the blank that one section 1.65mm is just arranged between two dot matrix up and down, and print the distance that a Chinese character will take two print lines, font is big, font is discrete serious, also misaligned with other non-chinese characters, thus make the Chinese character that prints more ugly.

Departments such as bank's post and telecommunications of domestic each big small city, market, hospital have been equipped with the POS machine mostly now, bill printer on these POS machines mostly is the nine kinds of needles printer, the Chinese character that prints often all is this 9 * 16 dot matrix Chinese characters, font is not attractive in appearance equally, all is a kind of defective concerning client to businessman.Though certain this miniature bill printer print speed of import at present is fast in addition, print quality is comparatively desirable, and import machine complex structure, price are high, and the numerous domestic user is hung back.

The purpose of this utility model provides a kind of novel bill printer that directly utilizes the ordinary bill printer port of printer to reequip, make and not only have characteristics such as simple in structure, that cost is low, have more superb print performance, the Chinese character definition of being printed is greatly improved, character pattern is arranged compact, font is well-balanced, and font is attractive in appearance.

The utility model is realized with following technical scheme: it still adopts the mechanical framework of common printhead, comprise the casing frame, printhead, the printhead stand, paper advance mechanism, colour band transmission mechanism, direct current generator, control circuit board is characterized in that being equipped with in addition a stepper motor and corresponding transmission mechanism on printer, and finishes big or small spacing paper feed action and line feed action by transmission mechanism drive paper advance mechanism.Why adopt technique scheme to be because will under the prerequisite of low-cost price, develop the product of high-quality performance, know from the aforementioned background art part, why the Chinese character that common printhead and high-grade printhead prints go out differs greatly, its key is the chinese character dot matrix difference that the two prints, 16 * 16 dot matrix that the Chinese character dot matrix of ordinary bill printhead is generally 9 * 16 dot matrix or pieces together, and the Chinese character dot matrix that the printhead prints of higher gears goes out can reach 16 * 16 dot matrix.So imagination directly utilizes the solution of common nine kinds of needles printhead prints 16 * 16 dot matrix Chinese characters as follows: common nine kinds of needles printhead is single-row arrangement, when printing non-chinese character (letter, numeral, symbol), still continue to use 7 * 9 original dot patterns; When printing chinese character, we only make eight pin work in the printhead nine kinds of needles at imagination, remain a pin and are in disarmed state, when printing 16 dot matrix Chinese characters, print at twice: print one 8 * 16 dot matrix for the first time earlier; Print for the second time one 8 * 16 dot matrix again, the dot matrix of printing is the odd-numbered line dot matrix of Chinese character for the first time, matrix of printed dots is the even number line dot matrix of Chinese character for the second time, before and after twice print position a bit of distance (less than pin spacing) that staggers a little up and down, such dot matrix that prints for twice is combined and has just been become high-quality 16 * 16 dot matrix Chinese characters.So on existing normal printer, add its paper advance mechanism of step motor control (in main frame, be furnished with again corresponding software be mated accurately control) in addition, when printing 16 * 16 dot matrix of a chinese character, print at twice, the position of twice printing, 8 * 16 dot matrix just is two print needle dot spacings (pin spacing) half (the M-780 printhead is 0.175mm) on paper feed before and after making, realize being connected naturally of two 8 * 16 dot matrix, constitute high-quality 16 * 16 dot matrix Chinese characters.

Below in conjunction with drawings and Examples concrete structure of the present utility model and operation principle are described in further detail.

Fig. 1 is a kind of assembly structure schematic diagram of the present utility model (the transmission mechanism sketch of printhead paper advance mechanism).

Fig. 2 is a perspective view of the present utility model.

Wherein: 1～frame (casing), 2～printhead, 3～paper web backplate (dividing plate), 4～belt pulley with tooth (with the engagement that cogs of paper web axle), 5～belt pulley, 6～belt, 7～direct current generator, 8～stepper motor, the stem gear on 9～stepper motor (driving gear), 10～driven pulley, 11～control circuit board.

With reference to accompanying drawing as can be known, when the utility model is made in specific design, be that the stepper motor that will be added is installed in a side of printhead frame, and can finish little spacing paper feed action and line feed action by the stem gear 9 and the belt gear drive paper advance mechanism of this stepper motor self.(is example with the M-780 printhead) its closely spaced dimensions length is controlled to be about 0.175mm, should be about half of print needle dot spacing (0.35mm).

The utility model stepper motor can adopt in Mechatronic control system widely used step pitch be 7.5 stepper motor of (be revolution move a step be 7.5 degree angles).Be example still with EPSON M-780 printhead, make this 7.5 degree angle be converted to the paper feed distance of 0.175mm, the motor stem gear that must select for use size to be fit to, stepper motor also will be installed in the appropriate location of frame simultaneously, (7.5 degree angle) makes paper advance mechanism paper advance 0.175mm just so that the stepper motor revolution moves a step, and this will adjust in practical operation as the case may be accordingly.After having printed the odd-numbered line dot matrix of Chinese character, only need make stepper motor change the even number line dot matrix of the printable Chinese character of seal that moves a step like this.Chinese character will be printed (odd-numbered line dot matrix and even number line dot matrix each once) twice, these, can be easily method by software control realize.

In sum, the utility model is controlled (the colour band transmission mechanism of printer and the motion of printhead stand are still by direct current generator in the original printhead and corresponding transmission mechanism control thereof) with the paper advance mechanism of printer by stepper motor that adds in addition and corresponding transmission mechanism thereof.Add stepper motor and have high output torque and reaction accurately, its control accuracy is much more accurate than direct current generator, thereby can satisfy quality requirement.When concrete the manufacturing, can directly utilize original belt gear to reequip, the feed belt that makes paper advance mechanism only passes through stepper motor and without the stem gear of direct current generator, the stem gear size of stepper motor will design just rightly simultaneously, can just be fit to little spacing, high-precision paper feed control requirement, control printhead according to above-mentioned principle establishment control corresponding software (can adopt MCS-51 series monolithic assembler language to write, program is placed in the program storage EPROM able to programme) simultaneously and finish these printings.Compared with the prior art, the utlity model has simple in structure, the Chinese character definition height that cost is low, print, dot matrix is arranged compact, the well-balanced advantage such as attractive in appearance of font, the utility model can be fit to son and utilize serial printhead repacking such as EPSON M-780, EPSON M-U311S to make.

Claims (2)

1, a kind of improved bill printer comprises the casing frame; Printhead, printhead stand, paper advance mechanism, the colour band transmission mechanism, direct current generator, control circuit board, it is characterized in that on printer, being equipped with in addition a stepper motor and corresponding transmission mechanism, and can drive paper advance mechanism by transmission mechanism and finish little of apart from paper feed action and line feed action.

2, bill printer according to claim 1, it is characterized in that the stepper motor that is added is mounted in a side of printhead frame, and can do little spacing paper feed action and line feed action by the stem gear and the belt gear drive paper advance mechanism of this stepper motor self, its little spacing dimension is about half of print needle dot spacing (pin is with distance).