JPH0642851Y2 - Printer - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to a thermal transfer type printing apparatus, for example.

[Prior art and its problems]

Conventionally, for example, a transfer paper provided with a heat-melting or heat-subliming ink on a base film and a cut recording paper are supplied between a platen roller and a thermal head, and a predetermined heating resistor of the thermal head is provided. There is provided a printing apparatus of a system in which the signal current of (3) is flowed to heat the thermal head to melt or sublimate the ink on the transfer paper and transfer the ink to the recording paper. FIG. 4 is a schematic side view of such a printing device. In the figure, 1 is a platen roller, 2 is a thermal head provided so as to come into contact with and separate from the platen roller 1 by being rotated by a predetermined driving means (not shown), and 3 is a supply head. The transfer paper 4, which is stretched between the side roller 3a and the winding side roller 3b and runs between the platen roller 1 and the thermal head 2 by a predetermined running means (not shown), has a predetermined size. This is a paper feed cassette capable of storing a large number of cut cut recording papers 5. When the paper feed cassette 4 containing the cut recording papers 5 is mounted in the paper feed cassette mounting portion of the printing apparatus and the paper feed roller 6 is operated. the paper feed roller 6, by the cooperative action of the spring biasing the cut recording paper 5 to the paper feed roller 6 side is provided to the separation claw 4 ₀ and the paper feed cassette 4 (not shown), the cut recording sheet 5 is in the paper feed cassette 4 Further, it is guided by the paper feed guides 7 and 8 and supplied to the platen roller 1 as indicated by an arrow A, and the tip of the cut recording paper 5 is clamped by the clamper 9 provided on the platen roller 1. When it is detected that the leading edge of the cut recording paper 5 is clamped to the platen roller 1 by the clamper 9, the platen roller 1 starts to rotate counterclockwise as indicated by an arrow B in FIG. Platen roller 1
When it is detected that the contact position between the thermal recording head 2 and the thermal head 2 is exceeded, the thermal head 2 comes into pressure contact with the platen roller 1 with the cut recording paper 5 and the transfer paper 3 interposed therebetween. A predetermined signal current is applied to the second heating resistor to perform printing. When the printing is completed and it is detected that the clamper 9 has come into contact with the position in front of the separation claw 10, the clamper 9 is separated from the surface of the platen roller 1 by this, and the cut recording paper 5
Since the clamp at the tip of the paper is released, cut recording paper 5
The tip end of the cut recording paper 5 is lifted by the elastic force of the platen roller 1 from the surface of the platen roller 1, and the platen roller 1 rotates in the same direction (counterclockwise direction in the figure). The platen roller 1 is separated in the direction indicated by the arrow C, and is discharged to the outside by the discharge rollers 11 ₁ and 11 ₂ rotating in the directions of the arrows D ₁ and D ₂ . However, this type of conventional printing apparatus is limited in the types of recording papers that can be used, and cannot print on cut recording papers of various sizes according to preference.

[Means for solving problems]

The present invention has been made in view of the above problems, and includes a platen roller that can be attached to and detached from an apparatus, and a thermal head that can contact the platen roller at a fixed position with respect to the apparatus and can be separated from the apparatus. A plurality of platen rollers having different diameters, each of which holds the central axis of the platen roller at a position equal to the radius of each of the platen rollers from the certain position on the same straight line passing through the certain position. The present invention provides a printing apparatus, which is provided with the bearing portion of

【Example】

1 to 3 are schematic side views of a main part showing one embodiment of a printing apparatus according to the present invention, FIG. 1 shows a case where a platen roller having a diameter of 160 mm is used, and FIG. 2 shows a diameter. Fig. 3 shows the case where a 140 mm platen roller is used.
It shows the case where a 120 mm platen roller is used. In each figure, 1a, 1b and 1c indicate platen rollers, and 1a has a diameter.
A platen roller having a diameter of 160 mm, a platen roller 1 b having a diameter of 140 mm, and a platen roller 1 c having a diameter of 120 mm. The platen rollers 1a, 1b, 1c are configured so that the axial center positions of the central axes of the platen rollers 1a, 1b, 1c can be replaced with the chassis 12 of the printing apparatus so that they are 0a, 0b, 0c, respectively. There is. That is, when it is desired to use the platen roller 1a having a diameter of 160 mm, the platen roller arranging mechanism 13 having the platen roller 1a is arranged as shown in FIG.
If you want to set the shaft center position of the central axis of 1a to 0a in the bearing portion 14a of the chassis 12 and use the platen roller 1b with a diameter of 140 mm, install the platen roller 1b. As shown in FIG. 2, the mechanism 13 is set on the bearing portion 14b of the chassis 12 so that the central axis position of the central axis of the platen roller 1b is 0b, and when the platen roller 1c having a diameter of 120 mm is used, The platen roller
As shown in FIG. 3, the platen roller arranging mechanism 13 in which 1c is arranged can be set in the bearing portion 14c of the chassis 12 so that the axial center position of the central axis of the platen roller 1c becomes 0c. Reference numeral 2 denotes a thermal head configured to be able to contact / separate with respect to the platen rollers 1a, 1b, 1c. The contact position between the thermal head 2 and the platen rollers 1a, 1b, 1c is
Regardless of the type of the platen rollers 1a, 1b, 1c, the point T is configured in any case. Therefore, the line connecting the points 0a, 0b, 0c, T should be straight.
b, 0c, and T are preset, and OcT is 60
mm, ObT is set to 70 mm, OaT is set to 80 mm, and Ob point and Oc point are set to be on the OaT line, and they are rotated by a predetermined driving means (not shown). ,
When the thermal head 2 is pressed against the platen roller, the thermal head 2 is pressed against the platen rollers 1a, 1b and 1c at the point T. 4a, 4b, 4c are paper feed cassettes capable of storing a large number of cut recording papers (not shown) cut into predetermined dimensions,
The paper feed cassettes 4a, 4b, 4c accommodating the cut recording paper can be mounted in the paper feed cassette mounting portion of the printing apparatus. The paper feed cassettes 4a, 4b, 4c may have the same shape, and the partition wall can be adjusted according to the length (dimension) of the cut recording paper. 7a, 8a, 7b, 8b, 7c, 8c are platen rollers 1a, 1b, 1c
It is a paper feed guide when using. It should be noted that the paper feed guides 7b and 7c and the paper feed guides 8b and 8c are the same parts in this embodiment, and as can be seen from the comparison between FIG. 2 and FIG. It is nothing more than a thing. Then, these paper feed guides 7a, 8a, or 7b, 8b, or
7c and 8c are configured so that they can be changed and set on the chassis 12 according to the platen roller 1a, 1b, or 1c, respectively. 10 is a separation claw, and the separation claw 10 is configured so as to be able to extend along the direction of the claw, and the platen roller 1
The tip position of the separation claw 10 can be adjusted according to a, 1b, 1c. It should be noted that instead of the separating claw 10, platen rollers 1a, 1b, 1c in which the total length of the separating claw is changed corresponding to the platen rollers 1a, 1b, 1c
It is also possible to use dedicated separation claws so that these separation claws can be changed and set with respect to the chassis 12. Although not shown, when changing a platen roller of a certain diameter to a platen roller of another diameter, the driving force from the platen roller drive motor is transmitted to the platen roller to rotate the platen roller. The mechanism can be replaced. That is, by changing a part of the driving force transmission mechanism, for example, a gear, the peripheral speed of the platen roller surface rotated by the platen roller driving motor is made constant regardless of the type of the platen roller, and the printing interval is set to the platen roller. It is configured to be constant regardless of the type of roller. When the printing apparatus is configured as described above, the platen roller can be replaced with another platen roller as necessary, and therefore, the number of types of cut recording paper applicable to one printing apparatus increases, and many types of recording paper can be used. Can be used. In particular, the printing apparatus of the present invention is not only configured so that the platen roller can be replaced, but even when the platen roller is replaced, the contact point between the platen roller and the thermal head at the time of recording and printing is the same. By doing so, it is possible to make the change of the other parts necessary when the platen roller is replaced to the minimum necessary, and therefore the cost of the printing apparatus becomes low. It should be noted that although the above embodiment does not describe the change setting mechanism of the parts such as the paper feed guide, it may be arranged such that mounting holes corresponding to each of them are provided on the chassis 12 side and the mounting holes are arranged in the mounting holes. is there.

【effect】

A printing apparatus according to the present invention comprises a platen roller detachable from the apparatus, and a thermal head capable of abutting on and separating from the platen roller at a fixed position with respect to the apparatus. Since a plurality of bearing portions for respectively holding the central axes of the plurality of different platen rollers at the positions equal to the respective radii of the plurality of platen rollers from the certain position on the same straight line passing through the certain position are provided, the platen is provided. When replacing the roller, the contact position between the platen roller and the thermal head can be made constant regardless of the diameter of the platen roller, the thermal head drive system can be shared, and necessary parts can be changed easily. The parts are easy to adjust when the platen roller is replaced, and there is a feature that printing misalignment does not easily occur.

[Brief description of drawings]

1 to 3 are schematic side views of essential parts showing one embodiment of a printing apparatus according to the present invention. FIG. 1 shows a case where a platen roller having a diameter of 160 mm is mounted, and FIG. FIG. 3 shows the case where the platen roller is mounted, FIG. 3 shows the case where the platen roller having a diameter of 120 mm is mounted, and FIG. 4 is a schematic side view of the conventional transfer printing apparatus. 1a, 1b, 1c ... Platen roller, 2 ... Thermal head, 4a, 4
b, 4c ... Paper feeding cassette, 7a, 8a, 7b, 8b, 7c, 8c ... Paper feeding guide, 10 ... Separation claw, 14a, 14b, 14c ... Bearing portion.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Nagata 3-12 Moriya-cho, Kanagawa-ku, Yokohama, Kanagawa Nihon Victor Co., Ltd. (72) Toshikatsu Ichihigashi 3-12 Moriya-cho, Kanagawa-ku, Yokohama, Japan Victor Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A printing apparatus comprising: a platen roller detachable from the apparatus; and a thermal head capable of contacting the platen roller at a fixed position with respect to the apparatus and being separable from the apparatus, the plurality of printing apparatuses having different diameters. A printing method characterized in that a plurality of bearing portions are provided for holding the central axis of the platen roller at a position equal to the radius of each of the plurality of platen rollers from the certain position on the same straight line passing through the certain position. apparatus.