Printer

Abstract

The present invention provides a printer which performs release action of a conveying roller pair at the paper discharge side with a simple mechanism through a driving source shared with a pressing plate gap adjustment mechanism. The pressing plate gap adjustment mechanism (70) of the printer (1) utilizes a synchronous rotation mechanism which uses one rotation shaft to enable a first guide shaft (57) and a second guide shaft (58) to synchronously rotate. In addition, the printer (1) has a first release mechanism for releasing the clamping state of a paper feeding roller pair (21), as well as a second release mechanism (200B) for releasing the clamping states of a first paper discharge roller pair (23) and a second paper discharge roller pair (24), and enables the release mechanisms to synchronously perform release actions. The second release mechanism (200B) for performing release of the paper discharge side enables a first release rod (210) and a second release rod (220) to swing based on rotation of the second guide shaft (58) which is arranged at the same side with the first paper discharge roller pair (23) and the second paper discharge roller pair (24) relative to a printing head (22), so as to lift a supporting frame (201) supporting driven rollers (23b) and (24b).

Description

technical field [0001] The present invention relates to a printer provided with a conveying mechanism, wherein the conveying mechanism conveys a recording medium that is clamped by conveying rollers along a medium conveying path passing between a print head and a platen. Background technique [0002] In a printer such as an inkjet printer, as a conveyance mechanism for conveying a recording medium along a medium conveyance path passing through a printing position, there is a pair of rollers that convey the medium by sandwiching it between a conveyance roller and a driven roller as a driving roller. the conveying mechanism. For example, conveying roller pairs are respectively arranged on the upstream side and downstream side of the print head, the recording medium is fed to the printing position by the upstream roller pair, and the recording medium passing the printing position is conveyed and discharged by the downstream conveying roller pair. [0003] Here, when a paper ja...

AI Technical Summary

Problems solved by technology

[0008] That is, in Patent Document 1, although the same drive source can be used to perform the releasing operation of the first conveying part and the second conveying part in conjunction with the operation of expanding the platen gap, in order to realize such a mechanism, it will be necessary to use many flat In addition to the synchronous rotation mechanism of the gears, a complex structure of a power transmission mechanism such as a gear train constituting the release mechanism is also provided.

In particular, since the second transport unit (exit roller pair) is far away from the gap adjustment motor, the power transmission mechanism that transmits power to the release mechanism has a complicated structure using many gears.

Therefore, the number of parts is large, and it is necessary to ensure a large installation space

In addition, in the gear train of the release mechanism, backlash will also cause rotation errors, so it is difficult to perform the release operation at an accurate timing.

Images