JP2591237Y2 - Ink ribbon cassette - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink ribbon cassette which can be used in a reversible manner. More specifically, the ink ribbon is caught on a recording sheet during printing, which may cause printing failure, meandering or sagging of the ink ribbon. Not with regard to ink ribbon cassette.

[0002]

2. Description of the Related Art An ink ribbon cassette which can be normally used for reversing has a pair of take-up / supply hubs in a main body. The respective winding and feeding functions at the hub are also reversed.

Usually, such a cassette is provided with a slack removing spring for removing the slack of the ink ribbon and a back tension applying spring for applying a back tension from the supply side of the ink ribbon during winding to prevent the ink ribbon from meandering. I have. And, among the above-mentioned ink ribbon cassettes, the ink ribbon cassette which can be used for reversing is
Since the pair of hubs arranged in the cassette are used as winding hubs, the back tension applying springs are arranged on the left and right side walls of the cassette and beside the respective winding / supplying hubs. The back tension acts on the ink ribbon on the supply side even when the ink ribbon is wound up by the hub.

[0004]

However, in the above-described reversible ink ribbon cassette, since the back tension applying springs are respectively disposed at the left and right positions in the cassette, not only the necessary supply side but also the winding side are required. Back tension also acts on the ink ribbon on the take-up side, reducing the take-up torque on the take-up side hub, causing the ink ribbon to be picked up on the recording paper and causing printing failure, or the ink ribbon meandering or sagging. There was a fear.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an ink ribbon cassette which does not cause a printing failure due to the ink ribbon being caught on recording paper during printing, and the ink ribbon does not meander or sag.

[0006]

SUMMARY OF THE INVENTION According to the present invention, there is provided a back tension applying means for applying a back tension to the ink ribbon in a cassette accommodating a pair of winding and supply hubs for the ink ribbon, and a slack of the ink ribbon. And a reversing-use ink ribbon cartridge in which the winding function and the supply function of the pair of winding / supply hubs are reversed by mounting the cassette in a reversed state. in the set, the back tension applying means is a friction imparting means formed by the contact portion with the wafer-safe inner surface of the cassette that faces the lower surface and the lower surface of the take-up and supply hub one to be on the supply side, When the cassette is used, the pair of take-up / supply hubs are in a non-contact state on the upper surface side of the cassette and in a contact state on the lower surface side. Haise is and, contact area of the contact portion of the half inner surface of the cassette that faces the lower surface and the lower surface towards the hub comprising the supply side, and the lower surface towards the hub to be wound side
The above object has been attained by providing an ink ribbon cassette characterized by having a contact area larger than a contact area of a contact portion with a half inner surface of the cassette opposed to the lower surface .

[0007]

[Action] ink ribbon cassette of the present invention is its use during, in the non-contact state and becomes and the lower surface side in a pair of take-up and supply hub both cassette upper surface becomes contact state, this time, one to be supply-side And the lower surface of the hub
The contact area of the contact part with the inner half of the cassette half
The lower surface of the hub on the winding side and a cassette facing the lower surface
The back tension acts on the ink ribbon on the supply hub side during the running of the ink ribbon and during the reverse running, since the contact area is larger than the contact area of the contact portion with the inner surface of the half.
The back tension hardly acts on the ink ribbon on the winding hub side. Therefore, according to the ink ribbon cassette of the present invention, the winding torque of the winding hub is not weakened, and there is no possibility that the ink ribbon is caught on the recording paper to cause printing failure, and the ink ribbon meanders or sags. There is no fear.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the ink ribbon cassette of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of the ink ribbon cassette of the present invention. FIG. 1 is a perspective view showing the appearance of the ink ribbon cassette, FIG. 2 is a plan view showing the inside of the ink ribbon cassette shown in FIG. 1, and FIG. FIG. 4 is a cross-sectional view taken along line X-X of the embodiment shown in FIG. 2 when used.
It is X-ray arrow sectional drawing.

The ink ribbon cassette of the present embodiment is shown in FIG.
As shown in FIG. 2, a back tension applying means 5 for applying a back tension to the ink ribbon 1 in a cassette 4 accommodating a pair of take-up / supply hubs 2 and 3 of the ink ribbon 1; The cassette 4 is provided with a slack removing spring 7 of a slack removing means for removing the slack, and the cassette 4 is mounted on the apparatus by inverting the front and back thereof.
The respective winding and supply functions of the pair of winding and supply hubs 2 and 3 are reversed so that they can be used in reverse.

As shown in FIG. 3, the back tension applying means 5 of the ink ribbon cassette of the present embodiment comprises a lower surface 3b of the supply-side winding / supply hub 3 and a lower surface 3b.
42a on the inner surface of the lower half 42 of the cassette 4 facing the
And a friction applying means formed by the abutting portion 5. When the cassette is used, the pair of take-up / supply hubs 2 and 3 are arranged so as to be in a non-contact state on the cassette upper surface side and in a contact state on the lower surface side. The contact area of the contact portion 5 between the lower surface 3b and the protrusion 42a on the inner surface of the lower half 42 is smaller than the hub 2 on the winding side.
Is larger than the contact area of the contact portion 6 between the lower surface 2b of the lower half 42 and the projection 42b on the inner surface of the lower half 42.

To explain this embodiment further, the projection 42a on the inner surface of the lower half 42 in FIG. 3 is formed in an annular shape around a hub hole in which the winding / supply hub 3 is mounted. The protrusion 42b on the inner surface of the lower half 42
Is also formed in an annular shape around the hub hole in which the winding / supply hub 2 is mounted. Then, the protrusion 42a
Is formed such that its diameter L is larger than the diameter M of the protrusion 42b, and the area of the upper surface of the protrusion 42a is larger than the area of the upper surface of the protrusion 42b. The diameter L of the projection 42a is equal to the diameter of the winding / supplying hub 2,
3 is formed to be smaller than the diameter N.

Therefore, the contact area of the contact portion 5 of the hub 3 on the supply side is larger than the contact area of the contact portion 6 of the hub 2 on the winding side. The upper half 41 in FIG.
The relationship between the protrusion 41a of the upper half 41 and the protrusion 41b of the upper half 41 is the same as the relationship between the protrusions 42a and 42b. In this case, the above-mentioned back tension applying means 5 comprises an upper surface 2a (which becomes a lower surface when inverted) of the winding / supplying hub 2 and a projection 41a on the inner surface of the upper half 41 of the cassette 4 facing the upper surface 2a. Are formed also by the contact portions.

As shown in FIG. 3, the length H of the take-up / supply hubs 2, 3 is shorter than the separation distance I between the upper half 41 and the lower half 42, and when the cassette is used, the upper surface of the cassette A non-contact state is formed on the side. The ink ribbon cassette of the present embodiment configured as described above has the A
In use with the surface facing up, the pair of take-up / supply hubs 2 and 3 are both in a non-contact state on the upper surface side of the cassette and in a contact state on the lower surface side.
The contact area of the contact portion 5 between the lower surface 3b of the lower half and the projection 42a of the lower half inner surface is larger than the contact area of the contact portion 6 between the lower surface 2b of the winding side hub 2 and the projection 42b of the lower half inner surface. Therefore, the back tension acts on the ink ribbon 1 on the supply hub 3 side and the back tension hardly acts on the ink ribbon 1 on the winding hub 2 side, so that the winding torque on the winding hub side is not weakened. There is no risk that the ink ribbon 1 will be picked up on the recording paper to cause printing failure, and there is no risk that the ink ribbon 1 will meander or sag.

In addition, when the cassette 4 is used upside down with the surface B facing upward, as shown in FIG. 4, an operation completely opposite to the above-described operation shown in FIG. 3 occurs. That is, in the state shown in FIG. 4, the lower surfaces 3a and 2a of the winding / supply hubs 3 and 2 come into contact with the protrusions 41b and 41a on the inner surface of the upper half 41, so that back tension acts on the supply side hub 2, Take-up side hub 3
Has little back tension.

The ink ribbon cassette of the present invention is not limited to the one shown in the above embodiment. For example, in the embodiment, the shape of the projection is such that the contact between the lower surface of the supply-side hub and the inner surface of the lower half is formed. It is only necessary that the contact area be larger than the contact area of the contact portion between the lower surface of the hub on the winding side and the inner surface of the lower half.

[0016]

According to the ink ribbon cassette of the present invention, there is no possibility that the ink ribbon is caught on the recording paper at the time of printing to cause printing failure, that the ink ribbon meanders or sags.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an appearance of an ink ribbon cassette according to an embodiment of the present invention.

FIG. 2 is a plan view of the inside of the ink ribbon cassette of the embodiment shown in FIG.

FIG. 3 is a graph showing X when the ink ribbon of the embodiment shown in FIG. 2 is used.
-It is an X-ray arrow sectional drawing.

FIG. 4 is a cross-sectional view taken along the line XX when the ink ribbon of the embodiment shown in FIG. 2 is used in reverse.

[Explanation of symbols]

 Reference Signs List 1 Ink ribbon 2 Take-up / supply hub (take-up hub) 2a Upper surface of take-up hub 2b Lower surface of take-up hub 3 Take-up / supply hub (supply hub) 3a Upper surface of supply-side hub 3b Supply-side hub Lower surface 4 cassette 41 upper half 42 lower half 42a lower half inner surface (projection) 42b lower half inner surface (projection) 5 back tension applying means

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-49473 (JP, A) JP-A-3-295677 (JP, A) JP-A-3-49978 (JP, A) 24372 (JP, U) JP-A 64-44153 (JP, U) JP-A 1-158153 (JP, U) JP-A 3-114354 (JP, U) "Trilogy" 4th edition, Sangyo Tosho Co., Ltd. Company, published March 15, 1985, pp. 31-34 (58) Fields investigated (Int. Cl. ⁶ , DB name) B41J 32/00 B41J 35/08

Claims (1)

(57) [Scope of request for utility model registration] 1. A cassette accommodating a pair of winding and supply hubs for an ink ribbon, comprising: back tension applying means for applying a back tension to the ink ribbon; and slack removing means for removing slack of the ink ribbon. A back-tension applying means, wherein the cassette is turned upside down and mounted on the apparatus so that the winding function and the supply function of the pair of winding / supply hubs are reversed. is a friction imparting means formed by the contact portion with the wafer over <br/> off the inner surface of the cassette that faces the lower surface and the lower surface of the take-up and supply hub direction to the supply side, a pair of winding The supply hubs are arranged so that, when the cassette is used, all the supply hubs are in a non-contact state on the upper surface side of the cassette and are in a contact state on the lower surface side. ~ side
The contact area of the contact portion between the lower surface of the hub that becomes the lower surface and the inner surface of the cassette facing the lower surface is opposite to the lower surface of the hub that becomes the winding side and the lower surface. An ink ribbon cassette characterized in that the contact area is larger than the contact area of the contact portion with the inner half of the cassette .