JP2586789Y2 - 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 in which an ink ribbon runs smoothly and can perform stable printing.

[0002]

2. Description of the Related Art Generally, an ink ribbon cassette is provided with a pair of hubs 12, 13 for winding and supplying an ink ribbon 11, similarly to the ink ribbon cassette shown in FIG. 1 showing an embodiment of the present invention. And a case 14 for rotatably storing the casings 12 and 13. A print head (not shown) is provided on the front end wall of the case 14.
The print head insertion recess 15 into which the print head is inserted is formed. An outlet 16 and an inlet 1 through which the ink ribbon 11 enters and exits are provided at the left and right front ends of both side walls of the print head insertion recess 15.
For example, the ink ribbon 11 supplied from the supply-side hub 13 is guided by guide pins 18 disposed obliquely rearward of the outlet 16 and close to the side wall.
6, the ink ribbon 11 that has exited from the outlet 16 to the print head insertion recess 15 enters the case 14 through the inlet 17, and reaches the hub 12 on the winding side by a guide pin 19 disposed diagonally rearward. Is configured.

The case 14 has a lower half 14a.
And an upper half 14b. For example, the protruding edge from the lower half 14a of the peripheral wall formed integrally with the lower half 14a is welded to the inner surface of the upper half 14b to be integrated. The ink ribbon 11 is shown in FIG.
As shown in (a), the doors 16 of the case 14 are contacted with the tips (right ends in the figure) of both side walls 15a, 15b of the print head insertion recess 15 constituting the doors 16, 17 as shown in FIG.
17.

[0004]

However, in the conventional ink ribbon cassette 10, the lower half 14a and the upper half 14b are formed or both sides of the print head insertion recess 15 formed integrally with the lower half 14a due to variations in welding. 4 between the upper edge 14b and the protruding edge (upper end in the figure) of the walls 15a, 15b from the lower half 14a.
(A) and (b), the ink ribbon 11 travels by contacting the leading ends (right ends in the figure) of both side walls 15a and 15b of the entrances and exits 16 and 17. In such a case, there is a problem that the ink ribbon 11 enters the gap δ and cannot run, and printing cannot be performed.

For this reason, the print head insertion recess 15 is used.
A projection is provided on the edge (upper end in the figure) of the side wall 15a, 15b protruding from the lower half 14a and on the side where the ink ribbon 11 contacts, so that the ink ribbon 11 does not enter the gap δ. Ink ribbon cassette 1
However, in the case of this ink ribbon cassette, the projections are caught on the mold during molding, and the lower half 14a does not come off from the mold.

Accordingly, an object of the present invention is to provide a print head insertion concave portion which is a contact portion of the ink ribbon at the entrance and exit of the print head insertion recess so that the ink ribbon is easily inserted into the both side walls so that the ink ribbon runs smoothly. Another object of the present invention is to provide an ink ribbon cassette excellent in productivity.

[0007]

According to the present invention, when the ink ribbon housed in a case consisting of a pair of halves is wound from one hub to the other hub, the ink ribbon is formed at the front end of the case. In the ink ribbon cassette, the ink ribbon is supplied to the print head insertion recess by running through the entrance while contacting the front ends of both side walls of the print head insertion recess. The above-described ink ribbon cassette, characterized in that at least the front ends of both side walls of the print head insertion concave portion extending toward the half are fitted into the wall surfaces of the other half. The purpose has been achieved.

[0008]

According to the present invention, when the ink ribbon is wound from one hub to the other hub, the ink ribbon is transferred to the print head insertion recess through the entrances on both sides of the print head insertion recess formed at the front end of the case. At this time, for example, at least the front ends of both side walls of the print head insertion concave portion forming the entrance and exit of the ink ribbon are fitted into the inner wall surface of the upper half, and at the junction between the front ends of both side walls and the upper half. Since there is no gap, even when the ink ribbon runs while contacting the front ends of both side walls, it can run smoothly without being caught and stable printing can be performed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in FIGS. FIG. 1 is a plan view showing an embodiment of the ink ribbon cassette of the present invention with the upper half removed, and FIG. 2 is a plan view of the ink ribbon cassette II shown in FIG.
FIG. 3 is a sectional view showing a section taken along the line II, and FIG. 3 is a view corresponding to FIG. 2 showing another embodiment of the ink ribbon cassette of the present invention.

The ink ribbon cassette 10 of the present embodiment is
As shown in FIG. 1, it is configured to include a pair of hubs 12, 13 for winding and supplying the ink ribbon 11 and a case 14 for rotatably housing the hubs 12, 13. A print head insertion recess 15 into which a print head (not shown) is inserted is formed in the front end wall of the case 14. An outlet 16 and an inlet 17 through which the ink ribbon 11 enters and exits are formed on the left and right front ends of both side walls of the print head insertion recess 15. For example, the ink ribbon 11 supplied from the supply-side hub 13 is obliquely rearward of the outlet 16. Guided by a guide pin 18 disposed at a position close to the side wall, the guide pin 18 reaches the outlet 16, from which the print head insertion recess 15 is provided.
The ejected ink ribbon 11 enters the case 14 from the inlet 17 and is configured to reach the winding-side hub 12 by the guide pins 19 arranged diagonally rearward.

The case 14 has a lower half 14.
a and the upper half 14b, and a side wall or the like formed vertically upward from the inner wall surface of the lower half 14a.
4b is integrally formed by welding to the inner surface. Also, both side walls 1 of the print head insertion recess 15 are provided.
As shown in FIG. 2, 5a and 15b extend from the inner wall surface of the lower half 14a toward the upper half 14b, and extend so that at least their front ends fit into the wall surfaces of the upper half 14b. . That is, the protrusions 20a and 20b are formed on the front ends of the side walls 15a and 15b of the print head insertion concave portion 15, that is, on the upper half 14b side of the portion (the right end in the figure) where the running ink ribbon 11 contacts. In addition, fitting grooves 21a and 21b corresponding to the projections 20a and 20b are formed on the inner wall surface of the upper half 14b, respectively. When the lower half 14a and the upper half 14b are integrated, the protrusions 20a and 20b are fitted into the fitting grooves 21a and 21b, and the two wall surfaces 15a and 21b are fitted together.
a, 15b are configured such that no gap is formed on the upper half 14b side of the front end portion. Also, a recess 1 for inserting a print head.
Similarly to the fitting wall 21a and 21b, the fitting edge formed on the upper half 14b of the peripheral wall surface integrally formed with the lower half 14a similarly to the fitting grooves 21a and 21b. It can be fitted into a groove (not shown) so that no gap is formed at the joint between the lower half 14a and the upper half 14b.

Next, the operation will be described. When the ink ribbon 11 is taken up from the supply side hub 13 to the take-up side hub 12 at the time of printing, the ink ribbon 11 is passed through the entrances 16 and 17 on both sides of the print head insertion recess 15 at the front end of the case 14. At this time, the projections 20a and 20b at the front ends of the side walls 15a and 15b of the print head insertion recess 15 forming the entrances and exits 16 and 17 of the ink ribbon 11 are connected to the inner wall surface of the upper half 14a. Into the fitting grooves 21a, 21b, and the side walls 15a, 15b
Since there is no gap at the front end of the ink ribbon 11, even when the ink ribbon 11 runs while contacting the front ends of the side walls 15a and 15b, the ink ribbon 11 can run smoothly without being caught and stable printing can be performed.

As described above, according to the present embodiment, the projections 20a, 20b are provided on the upper half 14b side of the front ends of both side walls 15a, 15b of the print head insertion recess 15, and the inner wall surface of the upper half 14b is provided. These projections 20a,
Since the fitting grooves 21a and 21b into which the 20b is fitted are provided,
There is no gap on the upper half 14b side of the front end portions of both side walls 15a, 15b, and the ink ribbon 11 can run smoothly without being caught in the entrances 16, 17, and stable printing can be performed. In this embodiment, the protrusions 20a and 20b of the print head insertion recess 15 are
The protrusions 20a and 20b can be easily extended as in the prior art because they extend in the direction in which the molds 15a and 15b extend, that is, the direction in which the mold is removed.
b can be formed, the lower half 14a can be easily formed, and the ink ribbon cassette 10 excellent in productivity can be provided.

Further, the ink ribbon cassette of the present invention comprises:
As shown in FIG. 3, instead of the fitting grooves 21a, 21b, fitting holes 22a, 22b penetrating the upper half 14b are formed in the upper half 14b, and the projections 20a, 20b are formed.
May be adjusted to a length that does not protrude from the fitting holes 22a, 22b to the outer surface of the upper half 14b. The embodiment shown in FIG. 3 can expect the same operation and effect as the above embodiment.

Incidentally, the present invention is not limited to the above embodiments. The portion of the side wall of the case where the ink ribbon 11 contacts during traveling, ie, at least the side walls of the print head insertion recess. May be extended so that the front end of one of them extends from one half into the wall surface of the other half, and other configurations can be changed as appropriate in accordance with the conventional ink ribbon cassette.

[0016]

According to the ink ribbon cassette of the present invention, there is provided a gap in which the ink ribbon can easily enter into both side walls of the print head insertion concave portion which is a contact portion of the ink ribbon at the entrance and exit so that the ink ribbon runs smoothly. And high productivity.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of an ink ribbon cassette according to the present invention with an upper half removed.

FIG. 2 is a perspective view of the ink ribbon cassette shown in FIG.
It is sectional drawing which shows the cross section of a line direction.

FIG. 3 is a view corresponding to FIG. 2, showing another embodiment of the ink ribbon cassette of the present invention.

FIGS. 4A and 4B are views showing a conventional ink ribbon cassette, in which FIG. 4A shows a state in which the ink ribbon is running normally, and FIG. It is a figure which shows the state which became impossible.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Ink ribbon cassette 11 Ink ribbon 12 Take-up side hub 13 Supply side hub 14 Case 14a Lower half 14b Upper half 15 Print head insertion recess 15a Side wall of print head insertion recess 15b Side wall of print head insertion recess 16 Exit 17 Entrance 20a Projection 20b Projection 21a Fitting groove 21b Fitting groove 22a Fitting hole 22b Fitting hole

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-55-87592 (JP, A) JP-A-3-118672 (JP, U) JP-A-6-57659 (JP, U) JP-A 7- 40151 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) B41J 32/00-32/02 B41J 17/22-17/26 B41J 17/32

Claims (1)

(57) [Scope of request for utility model registration] When winding an ink ribbon housed in a case consisting of a pair of halves from one hub to another hub, the ink ribbon is placed on both sides of a print head insertion recess formed at the front end of the case. In the ink ribbon cassette, which runs while contacting the front end of the wall to supply the ink ribbon to the print head insertion recess, the printing extending from the inner surface of one of the halves to the other half. An ink ribbon cassette characterized in that at least the front ends of both side walls of the head insertion recess are fitted into the wall surfaces of the other half.