JPH04276460A - Thermal line printer - Google Patents

Abstract

PURPOSE:To make it easy to hang springs and to position and install a shaft by providing spring fit-up mechanism on a head mounting plate and a guide groove for inserting the shaft in one side plate. CONSTITUTION:Torsion springs 13a and 13b are fixed, temporarily with its supporting point at a shaft 6, to spring fit-up pieces 11a and 11b of which each one end is transformed and held previously to a height of spring pegs of side plates 1a and 1b at the time of installation. The shaft 6 is arranged being deviated to the torsion spring 13b so as not to abut against the side plate 1b at the time of mounting on a printer body. For mounting on the printer body, the torsion spring 13a of the shaft 6 is inserted slidably along a groove 7 of the side plate 1a, and hanging parts of the torsion springs 13a and 13b which are transformed and held previously to the height of the spring pegs of the side plates 1a and 1b by the spring fit-up pieces 11a and 11b are slid to the side plates 1a and 1b respectively.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal line printer.

0002

2. Description of the Related Art A thermal line printer having a mechanism for applying pressure to a head using a conventional torsion spring has a head section that includes a thermal head and a head mounting plate for attaching the thermal head to a shaft for supporting the thermal head in the printer body. A torsion spring for obtaining head pressure was passed through the shaft, the shaft was fixed to both side plates with screws, and the ends of the torsion spring were hooked to the both side plates.

0003

However, with the above-mentioned conventional configuration, when hooking the spring to the side plates, the hook at the end of the spring must be deformed to be higher than the side plate. There is a risk of causing unreasonable deformation. Furthermore, fixing both ends of the head shaft with screws makes the positioning inconsistent and laborious.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and aims to provide a thermal line printer that is easy to spring, position, and install a shaft.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the thermal line printer of the present invention includes a printer main body in which a platen roller is rotatably supported on a housing having side plates on both sides; a thermal head that is detachable from the platen roller; a head mounting plate that is attached to the thermal head and has a shaft that is supported at both ends by the side plate; and a head mounting plate that is disposed on the shaft and has one end that is attached to the side plate of the housing. a spring for head pressure contact that is hooked on the spring and whose other end abuts the head mounting plate; and a spring temporary fixing piece that is provided on the head mounting plate and that temporarily holds one end that is hooked on the side plate of the spring for head pressure contact. A guide groove is provided in one of the side plates and reaches a shaft hole that supports the shaft.

[0006]

[Operation] With this structure, the thermal line printer of the present invention can easily attach the shaft by providing a guide groove that reaches the shaft hole in one side plate, and can ensure positioning. Further, it is possible to attach the spring to the printer main body while passing it through the shaft, and the spring temporary fixing mechanism makes it easy to hook the spring to the side plate.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A thermal line printer according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of the thermal line printer of the present invention, and FIG. 2 is an enlarged view of the vicinity of the guide groove. Also, Figures 3(a) and (b)
) are a plan view and a side view of the head assembly of the thermal line printer.

In the figure, reference numeral 1 denotes a housing with side plates 1a and 1b on both sides, and a platen roller (not shown) is installed at the bearing part of a paper guide block 1c integrated with the paper insertion part.
The printer main body is constructed by rotatably supporting the printer.

An operation knob 2 is attached to one end of the platen roller, and a gear 3 is attached to the other end. The gear 3 at the other end is coupled to a motor 5 via a reduction gear group 4 so that rotational force can be transmitted, and the rotation of the motor 5 rotates the platen roller and feeds the paper. Further, as shown in FIGS. 1 and 2, the side plate 1a is provided with a shaft hole portion for positioning and supporting the shaft 6, and a guide groove 7 for insertion that reaches this hole, and the side plate 1b is provided with a shaft hole portion for positioning and supporting the shaft 6. A shaft hole 8 for positioning and supporting is provided. As shown in FIG. 3, the head section includes a line-type thermal head 9 that is detachable from the platen roller, and a holding piece 10 that is fixed to the back side of the thermal head 9 and holds the shaft 6.
and a head mounting plate 12 with spring temporary fixing pieces 11a and 11b, a shaft 6, and torsion springs 13a and 1 for head pressure contact.
3b.

The structure of the head assembly of this embodiment and its attachment to the printer body will be explained in detail. Figure 3
As shown in , one end of each of the torsion springs 13a, 13b is a spring temporary fixing piece 11a, 11b that is deformed and held to the height of the spring hanging part of the side plate 1a, 1b at the time of installation.
It is temporarily fixed on a shaft 6 as a fulcrum. Further, the shaft 6 is shifted toward the torsion spring 13b so as not to hit the side plate 1b when attached to the printer main body. To attach it to the printer body, use the torsion spring 13 of the shaft 6.
Insert the a side by sliding it along the guide groove 7 of the side plate 1a, and hook the torsion springs 13a and 13b, which have been deformed and held in advance to the height of the spring hanging portion of the side plates 1a and 1b by the spring temporary fixing pieces 11a and 11b. the side plates 1a,
Spring loading is performed by sliding it to the 1b side.

Further, the shaft 6 is slid until it is held in the shaft hole of the side plate 1b, and the side plate 1a side of the shaft 6 is attached to the hook 14.
It can be attached to the printer body by fixing it with screws.

0012

As described above, the thermal line printer of the present invention has a structure in which a spring temporary fixing mechanism is provided on the head mounting plate and a guide groove 7 for shaft insertion is provided in one side plate. This is extremely effective in practical terms because it allows the spring attachment work to be carried out safely and easily, and also allows for easy insertion and attachment of the shaft.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a thermal line printer according to an embodiment of the present invention.

[Figure 2] Enlarged view of the guide groove of the same thermal line printer

[Figure 3] (a) and (b) are a plan view and a left side view of the head assembly of the same thermal line printer.

[Explanation of symbols]

1 Housing 1a, 1b side plate 6 axis 7 Guide groove 9 Thermal head 11a, 11b Spring temporary fixing piece 12 Head mounting plate 13a, 13b Torsion spring

Claims (1)

[Claims] Claims: 1. A printer main body in which a platen roller is rotatably supported on a housing having side plates on both sides, a thermal head that is detachable from the platen roller, and a printer body that is attached to the thermal head. a head mounting plate having a shaft having both ends supported by the side plate; a head pressure contact spring disposed on the shaft and having one end hooked on the side plate of the housing and the other end abutting the head mounting plate; a spring temporary fixing piece provided on the head mounting plate for temporarily holding one end of the head pressure welding spring hooked on a side plate, and reaching a shaft hole that supports the shaft in one of the side plates; Thermal line printer with guide grooves.