JPH0221241Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention mainly relates to technology for a small portable thermal printer.

(Prior Art) Conventionally, in order to move the thermal head parallel to the platen while pressing it against the platen, a mounting bed is screwed onto one screw shaft and attached to another guide shaft. These two axes were used in tandem.

Therefore, there are disadvantages in that a large number of parts are required, which increases costs, requires extra space, and makes the entire device bulky. (No particular literature) (Technical problem) The present invention was made in view of the shortcomings of the prior art.Instead of the extra guide shaft, a roller is attached to the head feeder, and the roller is moved along the paper guide. The technical challenge is to move it around.

(Technical Means) In order to solve the above-mentioned technical problem, in the present invention, the screw shaft and the roller guide path integrally molded on the paper guide member are positioned parallel to each other, and the guide roller mounted on the head carriage is The head carriage is brought into contact with the vertical wall surface of the roller guide path so as to reciprocate in the longitudinal direction along the screw axis together with the guide roller.

(Example) Specifically, as shown in FIGS. 1 to 5, the following configuration is provided.

Reference numeral 1 denotes a screw shaft having a lead screw, which is positioned in the longitudinal direction parallel to a roller guide path 3 integrally molded with a paper guide member 2 made of synthetic resin.

Reference numeral 4 denotes a head carriage attached to the screw shaft 1, which is configured to reciprocate in the longitudinal direction (in the directions of arrows A and B) as the screw shaft 1 rotates.

A guide roller 5 is rotatably mounted on a roller shaft 8 hanging from the head carriage 4, and the guide roller 5 is in contact with a vertical wall surface 9 of the roller guide path 3 having a length l.

Therefore, the guide roller 5 is connected to the head carriage 4.
It moves in the same direction while rotating as it moves in the longitudinal direction.

A platen 6 is disposed in the paper guide recess 7 in the paper guide member 2 in the longitudinal direction.

The vertical wall surface 9 of the roller guide path 3 described above is formed parallel to the longitudinal direction along the screw axis 1.

Further, the screw shaft 1 and the platen 6 are arranged parallel to each other.

10 is an inverted U-shaped groove provided between the roller guide path 3 and the back side support wall 11 having a length L, and is formed along the longitudinal direction to prevent the roller guide path 3 from curving. This is effective for obtaining parallelism with the screw axis 1.

In general, synthetic resin molded products tend to have curvature and unevenness, but this can be prevented by forming the grooves 10.

Reference numeral 12 denotes a head holder designed to apply a pressing force to the platen 6 via the spring 14 on the head carriage 4, and keeps the head 13 in direct pressure contact with the platen 6 at all times.

15 is a flexible cable connected to the head 13.

16 is a top lid, 17 is a bail cover, 18 is a printer main body, and 19 is a bottom lid.

(effect) The above technical means works as follows.

As the screw shaft 1 rotates, the head carriage 4 moves linearly reciprocally in the direction of arrow A or B, and the guide roller 5 also moves in the same direction while rotating along the roller guide path 3, thereby adjusting the pressure position of the head 13 against the platen 6. Be variable.

(Effects) Since the present invention has the structure and operation as described above, it has the following unique effects.

(a) Since the head carriage is moved using a single screw shaft and guide roller, compared to the conventional two-wheel support rail system,
The entire device can be made extremely compact.

(b) Vertical wall surface 9 of synthetic resin roller guide path 3
Since the back side support wall 11 having a length L longer than the length L of the vertical wall surface 9 is formed in the longitudinal direction parallel to the vertical wall surface 9 through the inverted U-shaped grooves 10, curves and unevenness are generally avoided in synthetic resin molded products. It is possible to overcome the conventional drawbacks that tend to occur, to prevent the roller guide path 3 from curving, and to accurately maintain parallelism with the screw shaft 1.

(c) When the guide roller 5 is brought into contact with the vertical wall surface 9, the horizontal pressing force on the vertical wall surface 9 is determined by the vertical wall surface 9 having a length l, the groove 10, and the length L longer than the length l. Due to the combined structure of the back side support wall 11, there is no fear that the parallelism between the vertical wall surface 9 and the screw shaft 1 will be out of order and rattling will occur.

(d) The guide roller 5 is attached to the roller shaft 8 hanging from the head carriage 4, and the vertical wall surface 9 is
Since it came into contact with the guide roller 5 and the vertical wall surface 9
Since the contact area with the guide roller 5 becomes large, a stable contact state is obtained, and the rotational movement of the guide roller 5 can be performed smoothly.

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view showing the entire invention;
The figure is a plan view of the printer body, and FIG. 3 is a side view of the main parts of the invention, showing the relationship between the guide rollers and the roller guide path. FIG. 4 is a perspective view showing the relationship between the guide roller and the roller guide path, and FIG. 5 is a perspective view showing the relationship between the screw shaft, the printer bed body, and the platen. DESCRIPTION OF SYMBOLS 1... Screw shaft, 2... Paper guide member, 3... Roller guide path, 4... Head carriage, 5... Guide roller, 6... Platen, 1
0... Groove, 12... Head holder, 13...
Head.

Claims (1)

[Scope of utility model registration request] A roller guide path 3 having a vertical wall surface 9 in the longitudinal direction is integrally molded onto a paper guide member 2 made of synthetic resin having a paper guide recess 7 in the longitudinal direction to receive the platen 6, and a roller guide path 3 having a longitudinal wall surface 9 in parallel with the vertical wall surface 9 is integrally molded. A back side support wall 11 having a length L longer than the length L of the vertical wall surface 9 is formed through an inverted U-shaped groove 10, while a screw is inserted in the roller guide path 3 along the longitudinal direction. A shaft 1 is disposed, a head carriage 4 is mounted on the screw shaft 1 so as to be movable in the longitudinal direction, and the head carriage 4
The guide roller 5 is attached to the roller shaft 8 which is made to hang down more.
The printer is attached to the vertical wall surface 9 and is in contact with the vertical wall surface 9.