CN2480161Y

CN2480161Y - Printer capable of self-adaption printed media having different thickness

Info

Publication number: CN2480161Y
Application number: CN 00263105
Authority: CN
Inventors: 邬成利; 黄志祥; 张铁; 庆保存
Original assignee: ZHIKAI OFFICE AUTOMATION EQUIPMENT CO Ltd BEIJING
Current assignee: ZHIKAI OFFICE AUTOMATION EQUIPMENT CO Ltd BEIJING
Priority date: 2000-11-28
Filing date: 2000-11-28
Publication date: 2002-03-06
Anticipated expiration: 2010-11-28

Abstract

A printer which is capable of self-adapting printing mediators of different thicknesses comprises a prior printer body and the constructed members thereof, and also a clutch gear set which comprises a clutch and an eccentric driving gear engaged and arranged between a drive gear of the printing head and a character axle shaft, wherein the driving wheel of the clutch is engaged with the prior drive gear of the printer, and the driven wheel of the clutch is engaged with the gears of the character axle shaft through the eccentric drive gear. The utility model is capable of self-adjusting the distance between the printing head and the printing paper, solving the printing problems of different paper thicknesses, guaranteeing the printing quality, and has the advantages of simple structure, convenient maintenance, and low cost.

Description

The printer of self adaptation different-thickness print media

The utility model relates to a kind of printer of self adaptation different-thickness print media.

In real work, because its specific use often runs into the situation that special paper is printed, as: bankbook, invoice, all kinds of certificates etc.The thickness disparity of these print media is usually bigger.General printer converts electric impulse signal control to corresponding angular by the GAP motor, thereby mainly is to be used for the lifting of control word car, reaches the gap of regulating between printhead and the print platform.The word car is the carrier of printhead, and the built-in print needle of printhead is carried out and printed.Gap between printhead and the printing paper is controlled by travelling gear by the GAP motor.In the course of work of printer, by software in advance the stepping step number of GAP motor is set, thereby reaches the purpose of regulating the printhead lifting.But the thickness of print media can not constantly be set in actual the use, and the thickness of print media changes in a printing sometimes.Such as at the 1st, 2 page printing, its thickness is bigger, and when continuing to print these certificate the last few pages, it is thinner that print media becomes again.In the printer course of work, because special printing paper variable thickness, and the stepping step number of the GAP motor of control printhead lifting is certain, so when beginning to print, printhead certain step number that can descend, if the gap between printhead and the printing paper is not enough, after printhead compresses printing paper, the step number of GAP motor is not also covered, then motor can drive travelling gear and makes printhead continue to walk downwards, just can occur that printhead constantly clashes into print platform or printhead presses the dead phenomenon of gnawing of print platform, not only make printhead be difficult to accurate location, the effect of printing, precision just can not guarantee, also can be difficult to finish print job because of printhead too presses print platform, also as easy as rolling off a log damage printhead sometimes.Therefore for the problem of printing paper variable thickness, people have sought multiple kind of solution, and wherein representational is that mechanical adjustment method and platform move method.

1, mechanical adjustment method.Its cardinal principle is that the printing end at printhead has increased by one and can regulate the axis of rolling, for different paper when thick, this axle can drive printhead and move up and down, thereby has guaranteed that this scroll end is certain to the distance between the printhead, and promptly printhead is certain apart from the distance between the printing paper.Its defective is that printhead determined by machinery apart from the distance between the printing paper, can't regulate, and therefore can't realize that some needs to increase/reduce the situation of the dynamics of printing; In addition, this full mechanical elements is damaged easily, and inconvenient maintenance, and maintenance cost is also than higher.

2, platform moves method.Its cardinal principle is that print platform is adjusted, and makes that the distance between print needle and the printing paper is certain, thereby guarantees print quality for the thick printing paper of different paper.Its shortcoming is the mechanical realization complexity, inconvenient maintenance; And, uneven about print platform in print procedure, influence printing precision; In addition, in delegation, when the thick different situation of paper was arranged, what also can appear at the thin and thick intersection lost the word phenomenon.

The purpose of this utility model is to provide a kind of printer of self adaptation different-thickness print media, and it can regulate printhead automatically apart from the distance between the printing paper, solves the printing problem under the thick situation of various different paper, guarantee print quality, and simple in structure, easy to maintenance, cost is lower.

The purpose of this utility model is achieved in that

A kind of printer of self adaptation different-thickness print media, it comprises existing printer body and each component parts thereof, engagement is provided with the clutch gear group between the travelling gear of printhead and word axletree.

Described clutch gear group comprises clutch and eccentric drive gear, the wherein former travelling gear engagement of the driving wheel of clutch and printer, and the driven pulley of clutch is by the gears engaged of eccentric drive gear and word axletree.

The drive sprocket axle of described clutch is to extending to round barrel shape, and the inside of drum is provided with mandrel, and the cover drum inwall top, end top of mandrel is provided with the frictional drive spring between mandrel and the drum, and the other end of mandrel is affixed with the driven pulley that is set in the driving wheel outside.

Described frictional drive spring is arranged in the retaining hole, can be two and is provided with at interval with branches such as upper edge circumference.

Adopt the utility model not only to overcome above-mentioned various shortcomings, and make the printer can be thick in the automatic test paper of printing of any time, can regulate the printhead height automatically to different paper are thick, can prevent that printhead that printing paper thickness does not occur simultaneously from constantly clashing into print platform or printhead presses the dead phenomenon of gnawing of print platform, thereby guarantee print quality.

Below in conjunction with accompanying drawing and the fragrant case of concrete enforcement the utility model is described in further detail.

Fig. 1 cooperates schematic diagram for the position of the utility model device on printer is provided with transmission;

Fig. 2 is the structural representation of the utility model clutch;

Fig. 3 is Fig. 2 cross-sectional view.

Referring to Fig. 1,2,3, the utility model is a kind of printer of self adaptation different-thickness print media, and it comprises existing printer body and each component parts thereof, and engagement is provided with the clutch gear group between the travelling gear 1 of printhead and word axletree 4.The clutch gear group comprises clutch and 2 eccentric drive gears 3, and wherein the driving wheel 21 of clutch 2 meshes with the former travelling gear 1 of printer, and the driven pulley 22 of clutch 2 is by the gears engaged of eccentric drive gear 3 with word axletree 4.The driving wheel 21 of clutch 2 extends axially and is round barrel shape, the inside of drum is provided with mandrel 23, the cover drum inwall top, one end top of mandrel 23 is provided with frictional drive spring 24 between mandrel 23 and the drum, the other end of mandrel 23 is affixed with the driven pulley 22 that is set in driving wheel 21 outsides.Frictional drive spring 24 is arranged in the retaining hole 25, can be two and be provided with at interval with branches such as upper edge circumference so that stressed evenly.When certain step number is rotated in the driving that is subjected to motor when former travelling gear 1, the driving wheel 21 of clutch 2 drives driven pulley 22 by frictional drive spring 24 and rotates, drive eccentric drive gear 3 and carry out normal transmission, and word axletree 4 is rotated, drive printhead to bottom offset.When printhead itself pressed contact print media after, clutch 2 begins action, be subjected to, no longer the rotation with former travelling gear 1 passes to word axletree 4, driving wheel 21 rotates, and driven pulley 22 owing to be subjected to comes from frictional force word axletree 4, eccentric drive gear 3, that produce greater than frictional drive spring 24, and no longer rotates, therefore, word axletree 4 is not rotating

Present embodiment is 6 driving springs 24, and driving spring 24 is provided with for a long time, and the action clutch is tighter, is provided with after a little while, and clutch action is pine.

Therefore, use the utility model before each the printing, printhead can be provided with according to software and walk certain step number S downwards, and after printhead compressed printing paper, printhead just no longer descended, at this time, because the effect of clutch is no longer moved travelling gear, in order to avoid damage printhead, simultaneously, the GAP motor is covered the S step that should walk as before.Then, printhead begins to come back the P step (suitable printing height), after adjusting, begins to print.This shows,,, make print quality can not change always last printing interval remains the P height in step no matter how printing paper thickness changes.And, by regulating the P value, can also change the printing dynamics.

Claims

1, a kind of printer of self adaptation different-thickness print media, it comprises existing printer body and each component parts thereof, it is characterized in that: engagement is provided with the clutch gear group between the travelling gear of printhead and word axletree.

2, the printer of self adaptation different-thickness print media according to claim 1, it is characterized in that: described clutch gear group comprises clutch and eccentric drive gear, the wherein former travelling gear engagement of the driving wheel of clutch and printer, the driven pulley of clutch is by the gears engaged of eccentric drive gear and word axletree.

3, the printer of self adaptation different-thickness print media according to claim 2, it is characterized in that: the drive sprocket axle of described clutch is to extending to round barrel shape, the inside of drum is provided with mandrel, the cover drum inwall top, one end top of mandrel, be provided with the frictional drive spring between mandrel and the drum, the other end of mandrel is affixed with the driven pulley that is set in the driving wheel outside.

4, the printer of self adaptation different-thickness print media according to claim 3 is characterized in that: described frictional drive spring is arranged in the retaining hole independently spaced reciprocally, can be two and is provided with at interval with branches such as upper edge circumference.