Printing medium mechanism unit for printer

Abstract

The invention discloses a tension mechanism unit of printing medium for a printer, which comprises a pair of gear rack guiding devices and a tensile bar. Each gear rack guiding device is composed of a bracket, gear racks which are arranged on the bracket, and a clearance adjustment backup plate. The clearance adjustment backup plate and the gear racks are crosswise arranged along the axis of the tensile bar; both ends of the tensile bar are provided with gear wheels and guide bearings while the tensile bar is arranged in the gear rack guiding device and the gear wheel is engaged with the gear rack. A guiding working plane of the clearance adjustment backup plate is pressed against the guide bearing. After being set, the clearance adjustment backup plate can be adjusted when in equipment assembly, and then the distance between the gear racks and the clearance adjustment backup plate can be increased so as to be beneficial for the installation of the tensile bar. And then by adjusting working clearance between the gear wheel and the gear rack to a quite small clearance even no clearance, the ideal parallel states between the tensile bar and a feed roller and a wind-up roller of the printer can be realized, thus providing technical support for the improvement of the print quality of the printer.

Description

technical field [0001] The invention relates to the field of printers, in particular to a printing medium tension mechanism unit for a printer. Background technique [0002] Existing large-scale printers are generally equipped with a tension device, through which the printing medium is in a proper tension state, which not only helps to ensure the printing quality, but also enables the printed printing medium to be wound on the winding roller in parallel, Avoid deflection during winding. The tension device on the printer usually includes several tension mechanism units, as shown in Figure 1, each tension mechanism unit consists of a pair of rack guides symmetrically installed on the wall panels on both sides of the printer and a pair of rack guides floating on the rack. The guide device is composed of a tension bar, and each rack guide device is equipped with a rack and a baffle plate parallel to the rack, and a straight guide channel is formed between the rack and the baffl...

AI Technical Summary

Problems solved by technology

Since the purpose of setting up the tension mechanism unit is to make the printing medium move in parallel under the condition of proper tension, so as to ensure the printing quality of the printer, and whether the axis of the tension rod can be aligned with the paper feeding roller, winding roller and printing head of the printer The motion track of the machine is always kept in a good parallel state, which will directly affect the printing quality of the printer. Therefore, the tension mechanism unit on the existing printer has a large gap between the gear on the tension bar and the rack in the rack guide. Radial clearance, thus limiting the further improvement of the printing quality of the printer

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