JPS6013659Y2 - Ink ribbon switching device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an ink ribbon switching device.

Specifically, the present invention relates to an ink ribbon switching device that switches between ink ribbons impregnated with two colors of ink as necessary.

Ink ribbon cartridges used in typewriters impregnate one ink ribbon with two colors of ink, red and black, and generally print black for normal printing and red for corrections, deletions, etc. ing.

For this purpose, it is conceivable to change the print color between red and black by swinging the ink ribbon cartridge, but
In a printer where the distance between the print head and the platen is small, such as a wire dot printer, the ink ribbon comes into contact with the print head or paper, making it impossible for the ink ribbon to follow the swinging of the ink ribbon cartridge.

On the other hand, it is conceivable that the ink ribbon cartridge can be directly switched without shaking the ink ribbon cartridge, and only the part exposed to the outside of the cartridge can be directly switched.However, as mentioned above, when the distance between the print head and the platen is small, the switching operation is possible. It is difficult to insert a component into the gap.

Therefore, in the present invention, the ink ribbon cartridge is oscillated and a guide member is provided to guide the exposed ink ribbon, and this guide member is configured to be switched in relation to the oscillation of the cartridge. .

The ink ribbon switching device according to the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic side view of the ink ribbon switching device.

1 indicates a platen, which has a cylindrical shape. 2 is an ink ribbon cartridge, which is approximately C-shaped as shown in FIG.

This cartridge 2 can swing around the protrusions 5 by setting the protrusions 5 provided on both sides into the receiving portions 4 provided on the base 3.

6 is a plunger type magnet, which is fixed to the base 3.

This magnet 6 has a plunger 6a facing the lower surface of the cartridge 2, and by exciting this magnet 6, the cartridge 2 is swung, and the red portion 7a of the ink ribbon 7 is moved to the first position, that is, the printing position a. lead to.

Reference numeral 8 denotes a plate, one end of which is fixed to the base 3, and its free end facing the rear end of the cartridge 2.

When the excitation of the magnet 6 is stopped, the leaf spring 8 swings the cartridge 2 with its restoring force to bring the black portion 7b of the ink ribbon 7 to the second position, that is, the printing position a.

The stoppers 9 and 10 are for regulating the red position and the black position, respectively, and abut against the lower surface of the cartridge 2.

11 is an adjustment mechanism, and by adjusting the position of the stopper 10 with a screw, the swing range of the cartridge 2 can be adjusted.

Reference numeral 11 denotes a holding member, which is fixed to the base 3.

This holding member 11 has a holding plate 11a, which prevents the paper from floating up from the platen 1.

Further, the holding member 11 includes guide rods 11b and ll extending in parallel.
It has c.

A guide member 12 is fitted into the guide rods 11b, llc so that it can move along the longitudinal direction of the guide rods 11b, llc.

Reference numeral 13 denotes a spring, one end of which is set at the attachment part of the presser member 11 to the base 3, and the other end is set to the lower end of the guide member 12, so that the guide member 12 is always directed upward, that is, toward the free end of the guide rods flb and llc. It's pushing up.

The relationship between the presser member 11 and the guide member 12 is shown in FIGS. 3 and 4.
This will be explained according to the diagram.

As shown in detail in FIG. 4, the guide member 12 includes pedestals 12a and 12 for mounting the two ends of the cartridge 2.
b, a protrusion 12c for guiding the ink ribbon 7,
12d and the guide rod 11b of the presser member 11.

It has grooves 12e and 12f for fitting into 11c.

Therefore, the holding member 11 and the guide member 12 are connected as shown in FIG.
lc fits into one end of the spring 13 and the lower part of the holding member 11, and the other end is attached to the connecting portion 1 of the guide member 12.
Set it so that it touches the bottom edge of 2g.

Next, an outline of the red/black switching operation will be explained with reference to FIG.

First, in the case of black printing, the magnet 6 is not excited.

For this purpose, the cartridge 2 is positioned by the leaf spring 8 so that its lower end is in contact with the stopper 9.

Therefore, the black portion 7b faces the printing position a.

In this state, due to the spring pressure of the leaf spring 8, the guide member 12
is in the lower position compressing the spring 13.

FIG. 1 shows this state. Next, the case of switching from black printing to red printing will be explained.

At this time, the magnet 6 is excited.

This causes the plunger 6a to push up the bottom surface of the cartridge 2.

As a result, the cartridge 2 swings clockwise about the projection 5 against the spring 8, and its lower end abuts against the stopper 10.

In this state, the red portion 7a faces the printing position a.

As the cartridge 2 swings clockwise, the guide member 12 is also pushed upward by the spring 13.

At this time, the ink ribbon 7 is attached to the protrusion 12c of the guide member 12.
, 12d, the ink ribbon 7 is also switched from the black portion 7b to the red portion 7a as the cartridge 2 swings, that is, the guide member 12 moves, and the ribbon 7 facing the printing position a is switched from the black portion 7b to the red portion 7a.

As explained above, according to the present invention, a guide member is provided to guide the ink ribbon, and this guide member is moved in relation to the swinging of the cartridge, so that the ink ribbon is not exposed to the outside of the cartridge. The changed part also follows the cartridge switching operation, which improves print quality and
An improvement in printing speed can be achieved.

By making the dimensions of the print head tip and ribbon guide part highly accurate, the ribbon wrapping angle at the print head tip can be reduced.

As a result, ■ the frictional force during ribbon switching is reduced;

■ The print wire comes out easily and the wire is less likely to get caught in the grain of the ink ribbon.

Another advantage is that the ribbon cassette, print head, phone guide, mask, etc. can be moved forward and backward separately on a plane.

[Brief explanation of the drawing]

FIG. 1 is a side view of the main parts of the ink ribbon device according to the present invention.
Fig. 2 is a top view showing the assembled state of the cartridge, holding member, and guide/guide member; Fig. 3 is an exploded view of the holding member, spring, and guide member; Fig. 4 shows the guide member; a is a top view; b shows a side view. In the figure, 2 is a cartridge, 6 is a magnet, 7 is an ink ribbon, 8 is a leaf spring, 11 is a holding member, 12 is a guide member, and 13 is a spring.

Claims (1)

[Scope of utility model registration request] an ink ribbon cartridge containing an ink ribbon and fitted to a base so as to be able to swing between first and second positions, the ink ribbon cartridge being selectively brought into the two positions; a drive mechanism that is fitted to a guide rod fixed to the base to move between positions corresponding to the two positions of the ink ribbon cartridge, and for guiding the ink ribbon exposed to the outside from the ink ribbon cartridge; A guide member having a protrusion and a pedestal for mounting the tip of an ink ribbon cartridge, one end of which acts on the guide member and the other end of which acts on a base, and the guide member is arranged to correspond to the two positions. Contains a spring that is always in pressure contact with one position,
An ink ribbon switching device characterized in that the guide member is moved by a spring as the cartridge swings.