Upper paper guider of printer

Abstract

The invention discloses an upper paper guider of a printer, which comprises a mainboard and a star wheel. The star wheel consists of a toothed wheel and a smooth wheel arranged on the toothed wheel by means of injection molding, an elastic shaft penetrates through the star wheel, the star wheel is placed in a mounting groove on the mainboard via the elastic shaft, a press cake is connected onto the smooth wheel of the star wheel in an abutted manner, a groove for holding the toothed wheel is arranged on an end surface of the press cake, which contacts with the star wheel, a compression spring is connected to the top end of the press cake, one end of a compression spring is connected to the top end of the press cake, the other end of the compression spring is connected to the lower side of a pressure plate in an abutted manner, and the pressure plate is fixedly mounted onto the mainboard. The star wheel is elastically fixed onto the mainboard of the upper paper guider, accordingly, the star wheel can be automatically lifted up according to the thickness of a printed medium under the wheel, squeezing force and friction force of a lower paper guiding roller pressing on the printed medium are uniform, abrasion of a rubber ring on the surface of the lower paper guiding roller is reduced, and the upper paper guider is simple in structure, convenient in installation and applicable to equipment such as a laser or ink-jet printer, a copier, a scanner and the like required in printing.

Description

technical field [0001] The invention relates to a paper guide on a printer, belonging to the technical field of printer design and manufacture. Background technique [0002] With the improvement of office automation, more and more documents are electronically printed instead of handwritten. The printer plays an irreplaceable role in the process of converting from electronic to paper. The printer will feed the paper The printing media such as paper at the outlet is delivered to the inside of the printer for printing through the upper paper guide and the lower paper guide roller corresponding to the upper paper guide. The lower paper guide roller of the paper guide is output. In the prior art, the upper paper guide is generally composed of a main board and a star wheel installed on the main board. The lower paper guide roller is formed with a lower paper guide roller corresponding to the star wheel. The printing medium is between the star wheel and the lower paper guide rolle...

AI Technical Summary

Problems solved by technology

[0002] With the improvement of office automation, more and more documents are electronically printed instead of handwritten. The printer plays an irreplaceable role in the process of converting from electronic to paper. The printer will feed the paper The printing media such as paper at the outlet is delivered to the inside of the printer for printing through the upper paper guide and the lower paper guide roller corresponding to the upper paper guide. The lower paper guide roller of the paper guide is output. In the prior art, the upper paper guide is generally composed of a main board and a star wheel installed on the main board. The lower paper guide roller is formed with a lower paper guide roller corresponding to the star wheel. The printing medium is between the star wheel and the lower paper guide roller, and the star wheel is used to compress the printing medium so that the delivery guide of the printing medium can be realized by the rotational friction of the lower paper guide roller, but the star wheel is completely rigidly fixed It is installed on the main board of the paper guide on the printer, which causes the star wheel to not be lifted up automatically. When delivering printing media of different thicknesses, it is easy to cause a large difference in the pressing force of the printing media on the lower paper guide roller, thus Accelerate the wear of the rubber ring on the surface of the lower paper guide roller, shorten the service life of the printer's lower paper guide, and for printing media with uneven thickness, the thickness span is relatively large. The uneven delivery force in the same axial direction (elastic shaft axial direction) causes oblique displacement, which will eventually lead to printing skew; in addition, because the star wheel is rigidly fixed and installed, in order to be able to adapt to different thicknesses of printing media Delivery printing, and considering the wear life of the lower paper guide roller, generally the pressure between the star wheel and the lower paper guide roller is relatively small, and in order to ensure the friction during delivery, it is usually used to increase the star wheel and the lower paper guide roller. This will increase the manufacturing material and cost, and also increase the weight of the printer. When the paper that has just been inkjet printed is out, because the ink on the paper is not dry, too many star wheels and the bottom The number of paper guide rollers will also scratch the ink, which will affect the printing quality

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