JP2563246Y2 - Thermal head support for thermal transfer printer - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal transfer type color printer, and more particularly to a thermal head supporting device for printing a plurality of colors on a single sheet of paper.

[0002]

2. Description of the Related Art FIGS.
No. 54 shows a perspective view, a side view, and an exploded perspective view of a thermal head supporting device in a conventional thermal transfer type color printer. The thermal head 1 is rotatably held by a supporting shaft 9, One end is fitted to the rotating shaft 7 to hold the thermal head 1 at a fixed position. The thermal head 1 is moved up and down by a predetermined amount by the force of a double-headed arrow F applied by a thermal head vertical movement mechanism (not shown) from a thermal head holding plate 5 attached to a rotating shaft 7 via a guide plate 3. The roller 2 is pressed against or separated from the roller 2.

Next, the operation of the above-described conventional structure will be described. FIG. 4 shows a state in which the thermal head 1 is pressed against the platen roller 2, and the pressing on the platen roller 2 is performed by a thermal head pressing spring provided between the thermal head pressing plate 5 and the central portion of the thermal head 1. 6 is applied by the generated force P. The relative position between the thermal head 1 and the platen roller 2 is maintained by the contact between the abutting portion 3a of the guide plate 3 and the collar 4 rotatably provided on the platen roller core 2a. The contact pressure is obtained by a force generated by a compression spring 10 provided on the support shaft 9.

As described above, the thermal head 1 is pressed against the platen roller 2 by a predetermined pressure, the relative positions of the two are also maintained, and the print head is ready for printing. 1a is a support hole, 1b is an arm, 8
Denotes a bearing, 11 denotes a thermal head fixing washer, and 12 denotes a thermal head fixing pin.

[0005]

The conventional thermal head support device is constructed as described above. As shown in FIG. 4, the force of the pressing spring during printing is applied to the platen roller 2 and the head support shaft 9. It is divided. When the force is divided into the support shaft 9, a frictional force is generated between the support shaft 9 and the support hole 1 a of the thermal head 1 through which the support shaft 9 is rotatably inserted. If the processing accuracy is poor, the pressing force of the thermal head 1 by the compression spring 10 cannot be sufficiently obtained. In such a state, the relative position between the thermal head 1 and the platen roller 2 is not ensured, and printing problems such as uneven density and blurring occur. In addition, since the replacement of the thermal head 1 is performed as a whole including the arm portion 1b by removing the fixing pin 12 and the fixing washer 11, as shown in FIG. 5, unnecessary cost increase occurs.

The present invention has been made to solve the above-mentioned problems, and it is necessary to secure a relative position between a thermal head and a platen roller to prevent a printing problem and to replace a thermal head. An object of the present invention is to provide a thermal head supporting device for a thermal transfer printer which can be easily performed.

[0007]

SUMMARY OF THE INVENTION A thermal head supporting device for a thermal transfer printer according to the present invention includes a thermal head.
Pressing or separating from the platen roller, and printing paper
Thermal transfer printer that transfers ink to the
Head arm holder rotated by the head drive mechanism
Fixed to the holding shaft and this head arm holding shaft,
A head arm formed over the head side,
With the platen roller attached to both ends of the round head
A guide plate that abuts and a head support that stands upright on this guide plate
Moveable back and forth with respect to the pin and the platen roller, and
It has a groove for detachably supporting the head support pin.
Rotatably supported by the head arm holding shaft,
From a pair of parallel holding plates provided on both sides of the
The thermal head side of the head arm and the thermal head.
With the thermal head and detachably attached to the thermal head
And the head arm support spring
The thermal head provided between the thermal head and the thermal head
And a multi-head pressing spring .

[0008]

In this invention, the relative position between the thermal head and the platen roller is ensured by the head holding spring connecting the thermal head and the head arm, and the parallelism of the thermal head to the platen roller is ensured by the parallel holding plate. You. Further, the thermal head can be easily removed from the head holding spring and the parallel holding plate.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 are a perspective view and a side view of a thermal head support device of a thermal transfer printer according to this embodiment.
In the figure, 1 is a thermal head, 2 is a platen roller, between which a printing paper and an ink sheet are arranged,
The ink on the ink sheet is thermally transferred to the printing paper. 3 is a guide plate provided at both ends of the thermal head 1, 3a is a contact portion of the guide plate 3, 16 is a head support pin with a color erected on the guide plate 3, and 4 is a core 2a of the platen roller 2. A collar 17 rotatably provided is a head arm holding shaft, and one end of the head arm 13 is firmly fixed by a fixing bolt 18. In addition, 1c shows the thermal head in a detached state.

[0010] 15 is a pair of parallel holding plates disposed on both ends of the thermal head 1, a head arm holding shaft 1 that
7 is rotatably mounted on a head arm holding shaft 17 via a bearing 8, and a groove 1 is formed on the thermal head 13 side.
5a, and the groove 15a is provided with a head support pin 1a.
6, the head support pin 16 moves smoothly in the front-rear direction, but play is minimized. 6 is a thermal head pressing spring, Sir of the head arm 13
It is provided between the round head 1 and the thermal head 1.

Reference numeral 19 denotes a holding shaft rotating lever fixed to the head arm holding shaft 17, which is driven in the directions of arrows A and B by a head vertical movement mechanism (not shown). Reference numeral 14 denotes a head-up holding plate whose lower end is attached to the thermal head 1 by an attachment screw 20, and whose upper end becomes an engagement portion with the head arm 13 when the thermal head 1 is separated from the platen roller 2. Reference numeral 23 denotes a head holding spring composed of a leaf spring, which is attached to the tip of the head arm 13 and the head-up holding plate 14 by mounting screws 21 and 22. Thus, the thermal head 1 is restricted in the left-right direction, and is relatively free in the up-down direction and the front-back direction.

Next, the operation of the above configuration will be described.
In FIG. 2, the thermal head 1 is in pressure contact with the platen roller 2, and this pressing force is applied to the thermal head 1 from the head arm 13 via the pressing spring 6. At this time, the contact portion 3a of the guide plate 3 attached to the thermal head 1 is in contact with the collar 4 by the force from the head holding spring 23 and the rotation of the platen roller 2 in the direction of arrow B. The relative position with respect to the platen roller 2 is maintained.

A head support pin 16 is inserted into the groove 15a of the parallel holding plate 15, so that the parallelism of the thermal head 1 with respect to the printer main body on which the platen roller 2 is mounted is maintained. Further, since the force of the pressing spring 6 is received by the platen roller 2 on the straight line, only a light load is structurally applied to the head support pin 16 and the rotating collar 4 is provided, so that the thermal head The frictional force that hinders the back-and-forth movement of 1 is extremely small. Further, the thermal head 1 is detached from the groove 15a of the parallel holding plate 15 by removing the mounting screw 20, which simplifies the mounting and removal, and the head arm 13 remains on the printer main body side, so that it is inexpensive. can do.

[0014]

As described above, according to the present invention, the thermal head is separated from the head arm, the thermal head is connected to the head arm by a plate spring, and the thermal head is supported by the parallel holding plate so as to be movable back and forth. Therefore, the frictional force that adversely affects the positioning between the thermal head and the platen roller is reduced, and the occurrence of printing defects such as uneven density and blurring can be prevented. Also, the removal of the thermal head is extremely simple, and its replacement can be performed easily and inexpensively.

[Brief description of the drawings]

FIG. 1 is a perspective view of the invented device.

FIG. 2 is a side view of the invented device.

FIG. 3 is a perspective view of a conventional device.

FIG. 4 is a side view of a conventional device.

FIG. 5 is an exploded perspective view of a conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thermal head 2 Platen roller 3 Guide plate 4 Collar 6 Thermal head pressing spring 13 Head arm 15 Parallel holding plate 15a Groove 16 Head support pin 17 Head arm holding shaft 18 Fixing bolt 20-22 Mounting screw 23 Head holding spring

Claims (1)

(57) [Scope of request for utility model registration] 1. A is pressed against or disengaged thermal head to the platen roller, the thermal transfer printer for thermally transferring the ink during this time of the printing paper, and the head arm holding shaft which is rotated by a driving mechanism of the thermal head, holding the head arm The thermal head is fixed to the shaft.
A head arm which is formed across the de side, the platen attached to both ends of the thermal head
It includes a guide plate which abuts on the roller, and a head support pin erected on the guide plate, a groove for supporting the back-and-forth movement movably and removably said head support pin against the platen roller, the upper
Rotatably supported by the head arm holding shaft,
A pair of parallel holding plates provided on both sides of the thermal head, a plate spring, the head arm above Samaruhe'
Connecting the de-side and the thermal head, and a thermal head holding spring mounted detachably to the above Therma <br/> heads or others, the thermal head side of the head arm and the above Thermal <br/> heads or others thermal head supporting apparatus of the thermal transfer printer, characterized in that it comprises a thermal head pressing spring provided <br/> between.