JPH0576916B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a printer device, and in detail,
The present invention relates to a method for driving a thermal head and a method for transporting an ink film.

<Summary of the Invention> The present invention provides a thermal head, a platen roller that transfers photographic paper and an ink film having a plurality of transfer ink surfaces between the thermal head, and a thermal head that presses and separates the thermal head from the platen roller. The driving means presses the thermal head against the platen roller so as to sandwich the photographic paper and ink film to perform printing, and moves the thermal head so that the ink film is slightly separated from the photographic paper to transport only the ink film. Then, the thermal head is further separated, and with the ink film separated from the thermal head, photographic paper is introduced.
The present invention provides a printer device in which ink film can be replaced and various types of maintenance can be performed.

<Prior Art> FIG. 4 shows the ink film transport state (solid line) and printing state (broken line) in a conventional printer device.

In this figure, 1 is an ink film, 2 and 3 are ink film bobbins, 4 is a thermal head, 5 is photographic paper, and 6 is a cam 7 is a platen roller.

First, when printing with this printer, as shown by the broken line, the cam 6 lifts the thermal head 4 and the ink film 1, and the photographic paper 5 and the ink film 1 are moved between the platen roller 7 and the thermal head 4. It is done in between.

Next, the transfer of the ink film 1, the replacement of the ink film 1, and various types of maintenance are all carried out in the same state shown by the solid line.

<Problems to be Solved by the Invention> In FIG. 4, the ink film 1 is pulled out from each bobbin 2 and 3 because the thermal head 4 is largely displaced between the transport state and the print state of the ink film 1. A large difference occurs in the total length of the ink film 1. Therefore, when the thermal head 4 is separated, the ink film 1 is greatly loosened, and when the thermal head 4 is pressed into contact with the ink film 1, the ink film 1 may be wrinkled.

<Means for Solving the Problems> The present invention includes a thermal head, a platen roller for transporting photographic paper and an ink film having a plurality of transfer ink surfaces between the thermal head, and a thermal head driving means for pressing the thermal head into contact with and separating from the platen roller; the thermal head driving means includes a cam; the cam brings the thermal head into pressure contact with the platen roller so as to sandwich the photographic paper and the ink film; A second state in which the thermal head is separated from the photographic paper so that the ink film is slightly separated from the photographic paper, and a second state in which the thermal head is further separated from the second state and the ink film is separated from the thermal head. The printer is configured to be able to enter a third state in which it is separated from the printer, perform printing in the first state, and print in the second
In this state, only the ink film is transferred, and the third
The printer device is configured so that photographic paper can be introduced, ink film replaced, and various maintenance operations can be carried out in this state.

<Function> According to the present invention, when the ink film 1 is transferred, the ink film 1 is only slightly separated from the photographic paper 5, and the displacement of the thermal head 4 between the transfer state and the printing state is small, so that each bobbin 2 ，
The difference in the total length of the ink film 1 pulled out from the ink film 3 is reduced. Therefore, there is little slack in the ink film 1, and wrinkles and the like can be prevented.

<Example> An embodiment of the present invention is shown in FIGS. 1 to 3.

In these figures, 1 is an ink film, 2 is an ink film, and 2 is an ink film.
3 is an ink film bobbin, 4 is a thermal head, 5 is photographic paper, 6 is a cam, and 7 is a platen roller.

The thermal head 4 is operated by an operation motor 9.
The cam 6, which is rotated by a driving means consisting of a transmission mechanism 8 and a transmission mechanism 8, is driven to press against and away from the platen roller 7. The cam 6 has a cam groove 6a that is approximately semicircular and has two stepped portions near the outer periphery of the cam 6 and a little inside thereof that have the same shape as the concentric circumference of the cam 6.
is engraved.

11 is an L-shaped lever;
is swingably supported by a fixed pin 14,
It drives a clamper 12 that fixes the photographic paper 5 to the platen roller 7, and a lever pin 13 at its lower end engages with a cam groove 6a of the cam 6.
Further, this lever pin 13 moves up and down to drive the thermal head 4 upward.

When introducing the photographic paper 5 shown in FIG.
In addition to being easy to introduce, the workability is good when replacing the ink film 1 and performing various maintenance.

When printing by winding the photographic paper 5 around the platen roller 7, position the cam 6 at an angle such that the lever pin 13 is at the outermost step of the cam groove 6a, as shown in FIG. The head 4 is pressed against the platen roller 7.

When the printing of the first color is completed, the ink film 1 is transferred to the next color, but at this time, the printing of the third color is completed.
As shown in the figure, the cam 6 is positioned at an angle such that the lever pin 13 comes to the second step from the outer periphery of the cam groove 6a.
When positioned, the thermal head 4 is slightly separated from the platen roller 7, and the ink film 1 is only slightly separated from the photographic paper 5, so that the displacement of the thermal head 4 from the printing state (the state shown in FIG. 2) is small. Therefore, the difference in the total length of the ink film 1 pulled out from each bobbin 2, 3 between the printing state and the time of transporting the ink film 1 is reduced, so that the ink film 1 is less likely to loosen.

<Effects> As described above, according to the present invention, the displacement of the thermal head between the ink film transport state and the printing state can be reduced, and therefore the difference in the total length of the ink film drawn out from the bobbin can be reduced. When the thermal head is separated, the slack of the ink film is reduced, which prevents wrinkles in the ink film when the thermal head is pressed into contact with the thermal head. It is possible to provide a printer device in which ink film can be replaced and various types of maintenance can be performed.

Furthermore, according to the present invention, by equipping a positive cam, it is possible to reduce the load and directly detect the rotation of the positive cam, ensuring repeatable position accuracy, improving the reliability of the drive unit, and Position accuracy can be improved.

[Brief explanation of drawings]

FIG. 1 is a side view showing a state in which photographic paper is introduced in an embodiment of the present invention, FIG. 2 is a side view showing a printing state in an embodiment of the present invention, and FIG. 3 is an ink in an embodiment of the present invention FIG. 4 is a side view showing the state of film transfer, and FIG. 4 is a side view of a conventional example. 1: ink film, 2, 3: bobbin, 4: thermal head, 5: photographic paper, 6: cam, 6a: cam groove, 7: platen roller, 13: lever pin.

Claims (1)

[Scope of Claims] 1. A thermal head, a platen roller for transporting photographic paper and an ink film having a plurality of transfer ink surfaces between the thermal head, and a thermal roller for pressing the thermal head against and separating the thermal head from the platen roller. a first state in which the thermal head is brought into pressure contact with the platen roller so as to sandwich the photographic paper and ink film; A second state in which the head is separated from the photographic paper so that the ink film is slightly separated; and a third state in which the thermal head is further separated from the second state and the ink film is separated from the thermal head. The printer is configured to perform printing in the first state, and print in the second state.
In this state, only the ink film is transferred, and the third
1. A printer device characterized in that photographic paper can be introduced, ink film replaced, and various maintenance operations can be carried out in this state.