JPH03268982A - Thermal printing device - Google Patents

Abstract

PURPOSE:To ensure that the position of a thermal head can be automatically adjusted with ease and a thermal head can be prevented from becoming misaligned during printing by providing a guide groove on a bracket, then fixing a thermal head to the fastener so that a head heat generation part is located on the center line of the guide groove and engaging the guide groove with the core metal of a platen roller. CONSTITUTION:A bracket 11 is attached to a mounting arm 1 so that it moves finely in a free way using a lock pin 12. A guide groove 13 is provided on the bracket 11 and a thermal head 3 is fixed to the bracket 11 so that a head heat generation part 5 is located on the center line L of the guide groove 13. After that, the guide groove 13 is allowed to engage with the core metal 7 of a platen roller 6.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a thermal printing device, and particularly to a position regulating mechanism for a thermal head thereof.

(Prior Art) As is well known, in a thermal printing device, the thermal head is attached to a swingable mounting plate, and the thermal printing device is installed so that the head heat generating part is positioned at a predetermined position with respect to the platen roller. This is to adjust the position of the head.

FIG. 5 shows a conventional device of this kind, where 1 is a mounting plate which is swingable by a fulcrum shaft 2, 3 is a thermal head fixed to the mounting plate 1 with screws 4, and 5
is the heat generating part of the head.

6 is the platen roller, 7 is the core metal that is the center of rotation,
The platen roller 6 rotates around this.

In this configuration, when printing is performed on a trial basis first, and the printing result is defective, the thermal head 3 is placed against the mounting plate 1 so that the heat generating part 5 is located on the center line of the platen roller 6. , by making a slight movement in the print adjustment direction shown by arrow 8, and mvx the position.

Then, test printing is performed again, and when good printing results are obtained, attach the thermal head 3 to the mounting plate 1 with screws 4.
I am trying to fix it by.

(Problems to be Solved by the Invention) However, with this configuration, it takes a long time to adjust the position of the thermal head for printing, and the adjustment work is extremely troublesome.

An object of the present invention is to simplify the adjustment work by omitting the position adjustment of the thermal head.

(Means for Solving the Problems) This invention provides a method for attaching a mounting bracket to a mounting plate so as to allow slight movement.
A guide groove is provided in this mounting bracket, and the thermal head is fixed to the mounting bracket so that the head heating part is located on the center line of this guide groove, and this guide groove is fitted to the core metal of the platen roller. It is characterized by the following.

(Function) When printing, the mounting plate is rotated about its fulcrum shaft, thereby fitting the guide groove into the core of the platen roller. At the fitted position, the axis of the platen roller coincides with the center line of the guide groove. This allows the head heat generating portion to automatically match the precision of the platen roller.

Even if the thermal head is misaligned when the head is up, the mounting bracket will move slightly relative to the mounting plate when the guide groove is fitted to the core metal, and this will cause the head heating part to align with the axis of the platen roller. It will match automatically.

(Example) An embodiment of the invention will be explained with reference to FIG.

In addition, parts with the same reference numerals as in FIG. 5 indicate the same or corresponding parts.According to the present invention, the mounting bracket 11 is attached to the mounting plate 1 with a lock pin 12 so as to be slightly movable.

A guide groove 13 is provided in the mounting bracket 11, and this guide groove 13
The thermal head 3 is attached to the mounting bracket 11 so that the head heat generating part 5 is located on the center line L (see Fig. 4).
Fixed to. This guide groove 13 is adapted to fit into the core metal 7 of the platen roller 6.

When printing, the mounting plate 1 is rotated around its fulcrum shaft 2, thereby aligning the guide groove 13 with the platen roller 6.
The core bar 7 is fitted onto the core bar 7. At the fitted position, the axis of the platen roller 6 coincides with the center line L of the guide groove 13. As a result, the head heat generating section 5 is automatically brought into close alignment with the platen roller 6.

Even if the position of the thermal head 3 is shifted relative to the mounting plate 1, when the guide groove 13 is fitted to the core metal 7, the mounting bracket 11 will move slightly relative to the mounting plate 1, and this will cause the head The heat generating part 5 automatically matches the precision of the platen roller 6.

Even if the mounting mechanism of the thermal head is deformed during printing, the guide groove 13 is fitted into the core metal 7, so there is no possibility that the thermal head will be misaligned.

(Effects of the Invention) As described in detail above, according to the present invention, even if the position of the head heat generating part is misaligned with respect to the center line of the platen roller as in the conventional case, the guide groove can be connected to the platen for printing. By simply fitting it into the core of the roller, the position of the thermal head can be easily and automatically adjusted, and it also has the effect of preventing the thermal head from shifting its position during printing.

[Brief explanation of drawings]

Fig. 1 is a side sectional view showing an embodiment of the invention, Fig. 2 is a partial perspective view, Fig. 3 is a perspective view of the mounting bracket portion, Fig. 4 is a side view of Fig. 3, and Fig. 5 is a side view of a conventional example. DESCRIPTION OF SYMBOLS 1... Mounting plate, 3... Thermal head, 5... Head heating part, 6... Platen roller, 7... Core metal,
11...Mounting bracket, 13...Guide groove, L...Center line of guide groove,

Claims (1)

[Scope of Claims] A mounting bracket is attached to a mounting plate that is freely swingable about a fulcrum shaft so as to be able to move slightly, and a guide groove is provided in the mounting bracket, and the head heat generating part is located on the center line of the guide groove. A thermal printing device in which a thermal head is fixed to a mounting bracket, and the guide groove is fitted into a core bar serving as a rotation axis of a platen roller by swinging of the mounting bracket.