JPS63125354A - Printer - Google Patents

Abstract

PURPOSE:To simplify assembling and adjustment, by a method wherein notches formed so that the introducing part thereof is thin and the central part thereof is thick are provided to both ends of a mount member and a part of an engaging pin is made slightly smaller than the width of the introducing part of the mount member. CONSTITUTION:A thermal head 2 having a mount member 3 fixed thereto is inserted in a housing 6. Thereafter, the introducing part 30a of the notch 30 of the mount member 13 is inserted in the flat part of a pin 4 to be allowed to arrive at the central part 30b of the notch 30 and, thereafter, the head 2 is rotated in the direction shown by an arrow A. Next, a spring 8 being an elastic means is placed between the mount member 3 and a lid 7 to close the lid 7 and assembling is completed. Further, the central part 30b of one of the left and right notches 30 of the mount member 3 is formed into a slot so as to become long by a dimension (t) in an up-and-down direction. Therefore, with the help of the two springs provided left and right, the head 2 is placed at a proper position with respect to a platen 1 without requiring adjustment work. By this mechanism, uniform printing pressure is obtained over the entire region of the head.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printing device, and particularly to improvements in its assembly structure.

[Conventional technology] FIG. 5 shows the structure of a conventional thermal head.

A platen 1 is rotatably fixed between frames 5a and 5b. The thermal head 2 is mounted on the jig 6 and then rotated by 1 degree on the arm 4 by the shaft 10.
installed on. Therefore, by rotating the jig 6 around the shaft 10, the platen 1 is mounted.
It is possible to correct the inclination of the head 2 with respect to the angle. The arm 4 is rotatably attached to a shaft 3 fixed to frames 5a, 5b. Therefore, by rotating the arm 4 about the shaft 3, the height of the head 2 relative to the platen 1 can be adjusted.

During assembly, the position of the head 2 is adjusted as described above.

[Problems to be Solved by the Invention] However, the conventional printing device as described above has the following problems.

Thirdly, in order to adjust the position of the head 2, a jig 6, an arm 4, a shirt I/3, etc. are required for attachment, making the structure complicated.

Therefore, secondly, it was difficult to assemble.

Third, the position of the head 2 is adjusted using the jig 6 and the arm 40.
It had to be done by rotation, and the adjustment work was complicated.

This invention solves the above problems and has a simple structure.
The purpose is to provide a printing device that is easy to assemble and adjust.

[Means for Solving the Problems] In the printing device according to the present invention, a member is fixed to the print head, and this mounting is done by forming a notch at both ends of the member, which has a narrow introduction part and a thick center part. At the same time, a pin is provided in the housing so as to engage with this notch, and a part of this pin is formed flat in the vertical direction so that the width of the mounting part is slightly smaller than the width of the introduction part of the member.

[Function] The introduction part of the notch of the mounting member passes through the flat part provided on the pin and has the function of guiding the pin to the center of the notch.

[Embodiment] FIG. 1 shows the structure of a thermal printer according to an embodiment of the present invention, in which a platen 1 is fixed to a frame 6. L-shaped mounting members 3 are screwed to both ends of the thermal head 2, which is a print head. For installation, use component 3
is provided with a cutout 30, and the cutout 30 consists of an introduction part 3Qa and a center part 30b. Introduction part 30
The width of a is narrower than the width of the center portion 30b.

A pin 4 having a flat portion 4a is fixed to the housing 6. The flattened portion 4a is vertically flattened, and the width of the flattened portion is smaller than the width of the introduction portion 30a of the notch 30.

The assembly of the printer according to this embodiment will be explained using FIG. 4. First, for installation, the thermal head 2 with the member 3 fixed thereon is inserted into the housing 6. Thereafter, as shown in FIG.
After reaching 0b, the head 2 is rotated in the direction of arrow A, and the assembly is completed by placing a spring 8, which is a resilient means, between the member 3 and M7 and closing M7.

FIG. 2 shows this state.

In this embodiment, the center portion 30b of one of the left and right notches 30 is formed into a long hole so as to be elongated vertically by a dimension t. Therefore, two springs 8 are provided on the left and right sides.
Combined with this, the head 2 can be placed at an appropriate position relative to the platen 1 without requiring any adjustment work. That is,
Uniform printing pressure can be obtained over the entire area of the head.

In the above embodiment, the introduction portion 30a of the notch 30 is provided in the upper direction of the pin 4, but it may be provided in the lower direction.

In addition to the pin having a circular cross section, a pin having a rectangular cross section may also be used.

Further, in the above embodiments, a thermal printer has been described, but the present invention can also be applied to a wire dot printer.

[Effects of the Invention] The printing device according to the present invention is installed by providing a notch at both ends of the member with a thin introduction part and a thick center part, and inserting a pin into the housing so as to engage with this notch. A part of this pin is formed flat in the vertical direction so that the width is slightly smaller than the width of the introduction part of the member. Therefore, assembly and head position adjustment can be performed simply by engaging the pin and the mounting members.

That is, according to the present invention, it is possible to provide a printing device that has a simple structure and is easy to assemble and adjust.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the structure of a thermal printer according to an embodiment of the present invention, FIG. 2 is a sectional view of the printer shown in FIG. 1, and FIG. 3 is a diagram showing details of part I■ in FIG. FIG. 4 is a diagram showing the assembly of the printer shown in FIG. 2, and FIG. 5 is a perspective view showing the structure of a conventional thermal printer. 1 is a platen, 2 is a thermal head, 3 is a mounting member,
4 is a pin, 8 is a spring, 30 is a notch, 30a is an introduction part, and 30b is a central part. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (2)

[Claims] (1) A print head that performs printing operations on a print medium on a platen, having a notch with a narrow introduction part and a thick center part;
a mounting member fixed to the print head so that the notches are on both sides of the print head; a flat part formed flat in the vertical direction so as to be slightly smaller than the width of the introduction part of the mounting member; A printing device comprising: a pin fixed to the platen; and elastic means for pressing the print head toward the platen. (2) The printing device according to claim 1, wherein at least one of the notches of the attachment member has an elongated hole in the center.