JPS6325170Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ink ribbon cassette for storing an endless ink ribbon used in measurement recording printers, typewriters, and other printing devices.

Ink ribbon cassettes used in conventional printing devices are designed to prevent accidents such as the ink ribbon being pulled out at the ink ribbon outlet, getting tangled around the outlet, getting stuck at the outlet and not being pulled out smoothly. Various efforts have been made. For example, attaching a lever to the outlet, or designing the outlet itself into a comb-like or maze-like shape,
The ink ribbon cassette may have a complicated structure, such as a complex combination of walls and protrusions near the outlet to apply tension to the ink ribbon, or a built-in magnet in the outlet, or may be too large compared to the overall size of the ink ribbon cassette. However, there were drawbacks such as the size of the ink ribbon storage chamber becoming smaller. The present invention eliminates these drawbacks.

Hereinafter, it will be explained in detail using the drawings.

The drawing is a configuration explanatory diagram showing one embodiment of the present invention, and shows an example used in a measurement recording printer.

In the drawings, CST is the ink ribbon cassette according to the present invention, WDA is the dotting mechanism, PT is the platen, and PR is the recording paper.

In the ink ribbon cassette CST, 1 is the endless ink ribbon, 2 is the ribbon introduction port, and 3 is the endless ink ribbon.
4 is a feed roll, 4 is a ribbon storage chamber, 5 is a ribbon outlet provided at one corner of the deep end of the ribbon storage chamber 4, 6 is a side wall facing the feed roll 3, 7 is a ribbon outlet path, and 8 is a ribbon outlet. A cylindrical projection 9 with a height approximately equal to the width of the ribbon 1 provided near the side wall 6
10 is an end of the side wall 9; 11 is a side wall adjacent to the side wall 6 and facing the side wall 9; and 12 is a presser spring fitted in the lead-out path 7.

Ink ribbon cassette configured in this way
Explain the operation of CST.

The endless ribbon 1 has an ink ribbon introduction port 2
The ink ribbon is guided into the ink ribbon cassette by the feed roll 3 and stored in the ribbon storage chamber 4 in a folded state. The folded ink ribbon 1 is
The ribbon passes through an outlet 5 provided at one corner of the deep end of the ribbon storage chamber 4 and is drawn out from the ribbon storage chamber 4 substantially along the folding direction. That is, the ink ribbon 1 stored in the ribbon storage chamber 4 in a folded state by the feed roll 3 is sequentially moved to the side wall 6.
The ink ribbon is pressed against a protrusion 8 provided near the ink ribbon cassette CST, and is sent out of the ink ribbon cassette CST from the outlet 5 through the outlet path 7. Here, when the ink ribbon is guided to the outside of the ribbon cassette CST through the outlet 5, the protrusion 8 applies an appropriate tension to the ink ribbon 1, so that the folded ink ribbon 1 is guided to the outlet 5 one layer at a time. It not only prevents the transported ribbon 1 from clogging, but also plays a role in ensuring that the folded ink ribbon 1 is stored in the storage chamber 4 while maintaining an appropriate balance. Note that the attachment position of the protrusion 8 is preferably farther from the side wall 6 than the position of the end 10 of the side wall 9 forming the gap between the outlet port 5. Also, if it is too far away from the side wall 6, the folded ink ribbon 1 may get tangled with the protrusion 8, and the space in the ribbon storage chamber 4 will be reduced. It is desirable to make the interval smaller than 1/2 of the folded length of the ink ribbon 1. Furthermore, since the ink ribbon 1 folded on the projection 8 is pressed against the ribbon feed roll 3 side, if the position of the projection 8 is too biased toward the side wall 9 or the side wall 11, the ink ribbon 1 cannot maintain proper balance. Therefore, it will not fit in the storage chamber 4. Therefore, the protrusion 8 may be located near the center of the side wall 9 and the side wall 11.

As described in detail above, the present invention allows the ink ribbon 1 to be guided out from the outlet 5 very smoothly by the frictional force applied to the ink ribbon 1 by the protrusion 8. Although the effect is quite remarkable, it is also possible to further provide a pressing spring 12 in the lead-out path 7 to lightly press the ink ribbon 1 passing through the lead-out path 7. According to this, a constant tension can always be applied to the ink ribbon 1 drawn out from the ink ribbon cassette CST, and the effect of the protrusion 8 can be further enhanced.

In the drawing, for example, a metal pressing spring 12 is separately provided in the lead-out path 7, but this can be omitted by providing the side wall 9 in the drawing with a function as a pressing spring.

Furthermore, the protrusion 8 may be formed in a predetermined shape beforehand and may be attached, or may be integrally molded together with the storage chamber 4. Further, the protrusion 8 may be integrated with the side wall 6 so that the end thereof is located at a predetermined location. Furthermore, a rotating body may be used as the protrusion 8. In this case, the cylindrical body may be loosely fitted into the cylindrical protrusion 8 as shown in the embodiment, or the member to which the rotating roller is attached may be attached so that the rotating roller is located at a predetermined location. By using such a rotating body, it is also possible to reduce the amount of dust attached to the projections 8.

[Brief explanation of the drawing]

The drawings are configuration explanatory diagrams showing one embodiment of the present invention. CST... Ink ribbon cassette, 1... Ink ribbon, 2... Inlet, 3... Ribbon feed roll, 4... Ribbon storage chamber, 5... Outlet, 6,
9, 11... side wall, 7... lead-out path, 8... protrusion,
12...If you press it.

Claims (1)

[Scope of utility model registration request] The endless ink ribbon 1 is folded and stored in the ribbon storage chamber 4 by the ribbon feed roll 3.
In the ink ribbon cassette which is pulled out along the folding direction from the outlet 5 provided at one corner of the deep end of the ribbon storage chamber 4, the ink ribbon cassette is located approximately midway between the side walls 9 and 11 along the folding direction of the ink ribbon 1. At the same time, the ribbon feed roll 3 is located closer to the ribbon feed roll 3 than the end of the outlet port 5, and the ribbon feed roll 3
A protrusion 8 is provided so that the distance between the opposite side wall 6 and the side wall 6 is smaller than 1/2 of the distance between the side walls 9 and 11, and this protrusion 8 applies a constant frictional force to the ink ribbon 1. An ink ribbon cassette characterized by: