JPS59143668A - Printer - Google Patents

Abstract

PURPOSE:To reduce the number of parts, raise the productivity and assembling operability, cut down the cost and lessen noise during the working period of a printer by a method in which the cross section of a carriage shaft is shaped into a polygonal or oblong form and a head is allowed to be vertically driven by the rotation of the carriage shaft. CONSTITUTION:The cross section of a carriage shaft is shaped into an oblong form, and the shape of the carriage shaft insertion hole of a carriage 9 is also of the same as the carriage shaft 10. The carriage shaft 10 is rotatably attached to a chassis 11, and a lever 12 is attached to one end of the carriage shaft 10 and also to a plunger 6. By a coil spring 13, the lever 12 is energized in the opposite direction to the suction direction of the plunger. During the printing period, the lever 12 is pulled down by the coil spring 13, and the carriage shaft 10 fixed to the lever 12 is turned in the direction of arrow A. Since the sectional shape of the carriage shaft 10 is of an oblong form, the carriage 9 is not slided toward the turning direction of the carriage shaft 10, and the printing head 1 is pressed on the recording paper 2 by the carriage 9.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to, for example, a thermal printer that performs printing with a print head in contact with recording paper.

Conventional configuration and its problems Hereinafter, a conventional example will be explained with reference to FIGS. 1 and 2.

Reference numeral 1 denotes a print head, and a large number of heating elements (not shown) are provided on the surface facing the paper 2. A carriage 3 is slidable on a carriage shaft 4 and is driven by a timing belt 5. Still b is the plunger and link 7A.

The guide rail 8 is driven up and down via 7B.

It is a 3' roller and protrudes from the carriage 3. Here, the carriage shaft 4 is a member that has only the role of guiding the carriage 3 in the left and right printing direction and the valley mark x-x' direction, and has a head-up function to separate the head 1 from the recording paper 2. It needs to be provided separately. Therefore, it is necessary to provide guide rails 8 and rollers 9 that are operated by the plunger 6, which increases the number of parts, resulting in high costs, deterioration of productivity and assembly workability, and damage to each part, friction, etc. There is a problem with noise.

Purpose of the Invention The present invention eliminates the above-mentioned conventional drawbacks, and can reduce the number of parts, reduce costs, improve productivity, improve workability, and reduce noise during operation. It provides printers.

Structure of the Invention The present invention provides a structure in which the cross section of the carriage shaft attached through the gear ridge is polygonal, elliptical, etc., so that the carriage not only slides in the longitudinal direction of the carriage shaft, but also allows the carriage, nozzle, and shaft to slide in the longitudinal direction of the carriage shaft. By rotating it, you can also move the head up and down.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is a print head, 2 is paper, 4 is a plunger, and 5 is a timing belt, which are the same as those in the conventional example shown in FIGS. 1 and 2. Reference numeral 9 supports the print head 1 with a carriage nozzle, and is provided slidably on the carriage shaft 10. The carriage shaft still has a rectangular cross section, and the carriage shaft insertion hole of the carriage 9 also has the same shape as the carriage shaft 10. The carriage shaft 10 is still rotatably attached to the chassis 11. A lever 12 is attached to one end of the cartridge shaft 10 and connected to the plunger 6.

Further, 13 is a coil spring which urges the lever 12 in a direction opposite to the suction direction of the plunger. Therefore, during printing, the coil spring 13 pulls down the lever 12 and rotates the carriage shaft 10 fixed to the lever 12 in the direction of the arrow. Since the cross-sectional shape of the carriage shaft 10 is rectangular, the carriage shaft 10 and the carriage 9 do not slip in the rotational direction of the carriage shaft 10, and the carriage 9 presses the print head 1 against the recording paper 2. Conversely, when the head is raised upwards, such as when feeding paper, the plunger 6 is moved by the coil spring 13.
As a result, the carriage shaft 10 and the carriage 9 are rotated in the direction of arrow B, and the print head 1 is separated from the recording paper 2. In this way, the functions of suppressing and separating the print head 1 from the recording paper 2 are no different from those of the prior art, and the number of parts can be reduced as a result.

In the above embodiments, the cross section of the carriage shaft 10 may be rectangular, or the cross section of the carriage shaft may be polygonal or elliptical other than rectangular.

Effects of the Invention As described above, the present invention makes the cross-sectional shape of the carriage nozzle shaft polygonal or elliptical, so that the carriage shaft, which conventionally only served as a guide in the left and right printing directions of the carriage, can be used for printing. It can also be used as one of the components that has the function of driving the head up and down, reducing the number of parts, reducing costs, improving productivity and assembly workability, and reducing noise during operation. This is extremely advantageous.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a conventional printer, Fig. 2 is a side view of the main parts, Fig. 3 is a side view of main parts of a 7° linter according to an embodiment of the present invention, and Fig. 4 is a perspective view of the same. be.

Claims (1)

[Claims] A platen on which recording paper is placed, a printing nozzle that slides along the platen, a carriage on which the print head is mounted, and a polygonal or elliptical shape that guides the movement of the carriage and is relative to the chassis. A printer comprising: a rotatably mounted carriage shaft; a lever fixed to one end of the carriage shaft for rotating the carriage shaft; and a plunger for operating the lever.