JPS63262278A - Color ribbon change-over mechanism in printer - Google Patents

Abstract

PURPOSE:To conduct the fine adjustment of an initial height of a color ribbon with accuracy to enhance a printing quality, by providing a cam part, an elevater part consisting of a ribbon oscillator for vertically moving the color ribbon, and a phase adjusing gear consisting of two gears capable of changing a relative position relation in an angular direction. CONSTITUTION:A ribbon cartridge 8 held by a cassette holder 4 moves upwards when a position cam 2 rotates clockwise and downwards when it rotates counterclockwise. Gears 5A and 5B of a phase adjusting gear 5 engage with the position cam 2 and a drive gear 6, respectively, thereby transmitting the rotation of the position cam 2 to the drive gear 6. In the phase adjusting gear 5, the gear 5B is an integral part of a phase adjusting plate 5C having a slot. The gear 5A and the gear 5B are coaxially disposed. The phase of the gears 5A and 5B is adjusted by rotating the gears reversely to each other using a screw 5D, which allows the height of a ribbon 13 in a printing part 10 to coincide with the height of the ribbon 13 in the ribbon cartridge 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application 1] The present invention relates to a color ribbon switching mechanism for a printer, and more particularly to a color ribbon switching mechanism for a printer in which a cam portion and an elevator portion are connected so as to be able to adjust the phase.

C. Prior Art 1 Conventional color ribbon ν of this type of color printer device
) daJIIJ has a cam section consisting of a gear position cam with a cam, a cassette holder for swinging the color ribbon cartridge section up and down, and a cam section that moves the color ribbon in the printing section by changing the gear and shaft and moving the ribbon oscillator up and down. It has two structures: an elevator section for raising and lowering. As shown in FIG. 4, these two structures were connected using one gear 20, which was formed by integrally molding two gears 20a and 20b.

[Problems to be Solved] The color ribbon function mechanism of the conventional color printer device described above uses two gears 20 to connect the cam part and the elevator part.
Since this was done using a single gear 20 in which parts a and 20b were integrally molded, the initial height of the color ribbon in the color ribbon cartridge attached to the cassette holder of the cam part and the initial height of the color ribbon in the elevator part of the printing part were different. could only be adjusted within a limited range. As a result, the initial heights of the color ribbons at the two locations do not match, making it difficult to obtain high print quality.

[Means for Solving Problems] The color ribbon switching mechanism of the printer of the present invention, which solves the problems of the prior art described above, consists of a gear position cam having a cam and a cassette holder for swinging the color ribbon cartridge up and down. an elevator section consisting of a cam section, a ribbon oscillator for moving the color ribbon of the printing section up and down via a gear and a shaft, and a phase adjustment gear connecting the cam section and the elevator section, One phase adjustment gear made up of two gears whose positional relationship can be changed.

[Example] Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a perspective view of an embodiment of the present invention, and FIG. 2 is a perspective view of an embodiment of the present invention.
FIG. 3 is a left side view of FIG. 1, and FIG. 3(B) is a perspective view of the phase adjustment gear when disassembled and assembled.

In the color ribbon switching mechanism of the printer of this embodiment, a stepping motor 1 is used as a drive source for the color ribbon switching mechanism, and a gear is press-fitted into the stepping motor 1.

The cam part for moving the ribbon cartridge 8 up and down is
It is composed of a position cam 2, a cassette holder 4, and a spring 3. A gear press-fitted into the stepping motor 1 and a gear of the position cam 2 mesh with each other, and the cam portion of the position cam 2 is always in contact with the roller portion 2A of the cassette holder 4. That is, as shown in FIG. 2, the cassette holder 4 is tensioned by the spring 3 so that the roller portion is always in contact with the cassette holder 4. The ribbon cartridge 8 is held by the cassette holder 4, and moves upward when the position cam 2 rotates clockwise, and moves downward when the position cam 2 rotates counterclockwise. Also, phase: gear 5 of A adjustment gear 5
A is in mesh with the position cam 2, and a gear 5B is in mesh with the drive gear 6, transmitting the rotation of the position cam 2 to the drive gear 6. The drive shaft 7 is interlocked with the drive gear 6, and is connected to the slide torque gear 1 of the printing section 10.
1. Idle gear 12. The oscillator 9 is moved up and down via a timing belt, and the ribbon 13 of the printing section 10 is moved up and down. The ribbon 13 of the printing section 1O is connected to the position cam 2.
When rotated clockwise, it moves upward, and when rotated counterclockwise, it moves downward.

Next, the phase adjustment gear 5 will be explained below.

The phase adjustment gear 5 is composed of two gears and one adjustment plate. The gear 5B is integrated with a phase adjustment plate 5C, and the phase adjustment plate 5C is elongated. The gear 5A is coaxial with the gear 5B, and is made into one phase adjustment gear 5 using a screw 5D. Gear 5A and gear 5
By adjusting the phase of B by turning it in opposite directions,
The height of the ribbon 13 of the printing section 10 and the ribbon cartridge 8
The height of the ribbon 13 can be made to match the height of the ribbon 13.

[Effects of the Invention] As explained above, the present invention connects the cam part and the elevator part using a phase adjustment gear, thereby adjusting the initial height of the color ribbon of the color ribbon cartridge attached to the cam part and the printing part. You can fine-tune the initial height of the color ribbon in the elevator section. Therefore, it is possible to match the initial heights of the color ribbons at the two locations, resulting in high print quality.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing one embodiment of the present invention, Fig. 2 is a left side view of Fig. 1, and Fig. 3 (A) (11) shows phase adjustment during disassembly and assembly, respectively. FIG. 4 is a perspective view of a gear, and FIG. 4 is a perspective view of a conventional integrally molded gear. varnish-depping motor 2: position cam 3 spring 4: cassette holder 5: phase adjustment gear 6: drive gear 7: drive shaft 8: ribbon cartridge 9: oscillator IO: printing section 11 varnish slide torque gear 12: idle gear 13 : Ink ribbon 2A: Roller section 5A: Gear 5B: Gear 5C: Phase adjustment plate 5D = screw

Claims (1)

[Claims] a cam section consisting of a gear position cam having a cam and a cassette holder for swinging the color ribbon cartridge up and down; an elevator section consisting of a ribbon oscillator for moving the color ribbon of the printing section up and down via the gear and shaft; A printer comprising one phase adjustment gear that connects the cam part and the elevator part and is composed of two gears that can change the relative positional relationship in the angular direction. Color ribbon switching mechanism.