JP2573099Y2 - Printer pressing mechanism and tape transport device using the same - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial application field] The present invention uses a torsion coil spring.
Related to the pressing mechanism of the printer
For tape transport devices of tape printers that print on recording media
Applied.

[0002]

2. Description of the Related Art A conventional torsion coil spring is used as a tape pressing spring of a tape feed mechanism. The torsion coil spring is mounted by passing a coil portion of a spring through a shaft and simultaneously holding a U-shaped portion at the center of the spring above a spring hook portion. It was set by moving to a predetermined position while bending.

[0003]

However, in the above-mentioned prior art, the U-shaped portion at the center of the torsion coil spring is set while being deflected beyond the position of the spring hook portion. In addition, there is a problem that the spring is plastically deformed in some cases, and the set tape pressing force cannot be obtained. Furthermore, since a considerable load is applied when setting the torsion coil spring,
There was also a problem that workability was very poor. Accordingly, the present invention has been made to solve such a drawback, and an object of the present invention is to provide a pressing mechanism of a printer which can easily attach a torsion coil spring and does not cause plastic deformation of the spring. Things.

Further, since a considerable load is applied when setting the torsion coil spring, there is a problem that workability is extremely poor.

[0005] The present invention has been made to solve such a drawback.
An object of the present invention is to provide a tape feeding mechanism that can easily attach a torsion coil spring and does not cause plastic deformation of the spring.

[0006]

Means for Solving the Problems Pressing of the printer of the present invention
In order to solve the above problem, the mechanism includes a torsion coil spring having a straight portion formed by a spring wire at both ends and a U-shaped portion formed by a spring wire at the center of the spring, and a torsionally supporting the torsion coil spring. a guide shaft for the
By rotating the torsion coil spring in the load generation direction
Compressing the U-shaped portion in the axial direction of the guide shaft or
After stretching, release the compression or stretching force again
Guide the U-shaped part so that the U-shaped part
The spring hook member to be inserted and the U-shaped portion
After that, the pressed portion is brought into contact with the linear portion and urged by a predetermined load.
And a pressure member . In addition, the pressed
Using a roller member for transporting a tape-shaped medium as the member
As a result, a tape feed mechanism that can solve the above-mentioned problems
Can be provided.

[0007]

According to the above configuration of the present invention, the torsion coil spring can be inserted into the guide shaft without load.
Further, it can be attached to the spring hook simply by rotating in the load generating direction.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a tape printer according to an embodiment of the present invention;

FIG. 1 is a diagram showing the structure of a tape printer having a tape feed mechanism according to the present invention. FIG.
FIG. 2 is a top view. 1 and 2 show a state in which the lid 20 is open.

Reference numeral 5 denotes a print head having a plurality of heating elements (not shown) at equal intervals and held by a head support 6, and 7 a head having a contact portion 7-1 with a release lever shaft 16. A head arm pivotally supported by the arm shaft 9, a head support shaft 8 for supporting the head support 6 on the head arm 7, and a head holder 10 for urging the head arm 7 in the direction of the arrow e. It is a spring. 11 is a tape feed roller fixed to the shaft 28-1 of the tape feed gear 28,
12 is a tape feed roller holder having a contact portion 12-1 and holding a tape feed gear 28, and 13 is a shaft portion 28-1.
And 29 is a tape feed roller holder shaft that supports the tape feed roller holder 12.

Reference numeral 14 denotes a release lever which is rotatably supported by a release lever support shaft 15 fixed to the main frame 1 and is rotatable in the direction indicated by a double arrow. Reference numeral 16 denotes a release lever shaft fixed to the release lever 14. Reference numeral 17 denotes a release lever which is guided by the sub-frame 2 and is movable in the double-headed direction and abuts on the release lever 14. Reference numeral 20 denotes a release cam shaft 21 which has a function of controlling the movement of the release lever 17. Is a printer case to which the main frame 1 is fixed. 3 is a motor gear 2
2, a motor 26 having a reduction gear 23 and a transmission gear A2
4, a ribbon take-up gear receiving rotation of the motor gear 22 via 4, a ribbon take-up shaft 4 having a friction clutch structure and driven by a ribbon take-up gear 26, and 27 via a reduction gear 23 and a transmission gear B25. A tape feed transmission gear receiving rotation of the motor gear 22;
1 is a platen roller shaft, and 2-1 and 2-2 are tape cassette positioning shafts provided on the subframe 2.

In FIG. 1 and FIG. 2, the release lever 17 is pushed in the direction of arrow A by the release cam 18. Therefore, the release cam 18 receives a reaction force in the direction indicated by the arrow A by the force of the head holding spring 10 and the tape feed roller spring 13, and is prevented from rotating in the direction indicated by the double arrow.

FIG. 3 is a detailed perspective view of the vicinity of the tape feed roller spring 13 using the tape feed mechanism of the present invention.
FIG. 4 is a top view as seen from the direction of arrow G in FIG. FIG. 5 is a cross-sectional view showing the shape of the spring hook portion of the main frame 1 as viewed from the direction of the arrow in FIG. Thus, the vicinity of the spring hook of the tape feed roller spring 13 (main frame 1)
The shape will be described. Contact portion 1 of main frame 1
Numeral 1 serves to position the tape feed roller spring 13 in the direction of the arrow N.
3 is smaller than the width A of the U shape. The groove dimension D of the groove section 1-4 and the groove section 1-5 is larger than the wire diameter of the tape feed roller spring 13, and the slope 1-2 and the slope 1-3 that come into contact when the tape feed roller spring 13 is inserted. It has a shape having.

Next, how to attach the tape feed spring 13 will be described with reference to FIGS.

The tape feed roller spring 13 and the tape feed roller 11 are set on the tape feed roller holder 12, and the tape feed roller spring 13 is inserted into the tape feed holder shaft 29 in a free state (dotted line). After the insertion, the tape feed roller spring 13 is rotated in the direction indicated by the arrow in FIG. 4 to come into contact with the slopes 1-2 and 1-3 of the main frame 1. When the tape feed roller spring 13 is further rotated in the direction indicated by the arrow H, the tape feed roller spring 13 moves along the slopes 1-2 and 1-3 (the U-groove advances along the slopes 1-2 and 1-3 while being widened in the te direction).
Further, when it is rotated in the direction H and reaches the grooves 1-4 and the grooves 1-5, it is set as shown in FIG. 5 by the restoring force of the U-groove in the direction of arrow D. Therefore, as described above, the tape feed roller 11 is urged in the direction shown in FIG.

FIG. 6 shows a cassette of a tape printer having a tape feeding mechanism according to the present invention. Numeral 34 is a tape cassette containing a transparent film 35, a double-sided tape 36 having a mount, and a thermal ink ribbon 37. Reference numeral denotes a plate holding roller and a tape pressing roller housed in a tape cassette. The transparent film 35 adheres to the double-sided tape 36 at the point of the tape pressing roller 32.

FIGS. 6 and 7 show the tape printer equipped with the tape feeding mechanism of the present invention with the tape cassette mounted and the lid 20 closed. FIG. 6 is a top view, and FIG. 7 is a left side view. FIG. Since the positioning of the head arm 7 and the tape feed roller holder 12 is released by rotating the lid 20 in the direction indicated by the arrow, the print head 5 is urged in the direction indicated by the arrow by the force of the head pressing spring 10. Positioning is performed in a state of contact with the platen roller 33. Further, the tape feed roller 11 is urged in the direction indicated by the arrow F by the force of the tape feed roller spring 13 and positioned in a state of contact with the tape pressing roller 32.

Next, a description will be given of a tape feeding mechanism according to another embodiment of the present invention. FIG. 8 is a detailed view of the vicinity of the spring hook portion. The contact portion 41-6 of the main frame 41 plays a role in positioning the tape feed roller spring 13 in the direction of the arrow. Is wider than the width F of the U-shape. The G dimension of the groove 41-9 and the groove 41-10 is larger than the linear shape of the tape feed roller spring 13, and has a slope 41-7 and a slope 41-8 that come into contact when the tape feed roller spring 13 is inserted. It has become.

Therefore, the tape feed roller spring 13 is rotated by rotating the tape feed roller spring 13 in the direction indicated by the arrow.
The state shown in FIG. 8 is set by using the deflection in the direction of arrow n.

[0020]

As described above, according to the present invention, the torsion coil spring is inserted into the shaft with no load, and then inserted into the shaft.
Since the torsion coil spring can be set by a simple operation of rotating the shape portion, workability is improved and assembly time is shortened.

Further, since no unnecessary stress is applied to the spring when setting the spring, the spring itself is not deformed, and the set load can always be obtained.

According to the present invention, a great effect as described above can be obtained.

[Brief description of the drawings]

FIG. 1 is a side view showing the structure of a tape printer having a tape feed mechanism according to an embodiment of the present invention;

FIG. 2 is a top view showing the structure of the tape printer having the tape feed mechanism according to the embodiment of the present invention;

FIG. 3 is a perspective view showing the structure of the tape feeding mechanism according to the embodiment of the present invention;

FIG. 4 is a top view showing the structure of the tape feeding mechanism according to the embodiment of the present invention;

FIG. 5 is a sectional view showing the shape and operation of a spring hook portion of the tape feed mechanism according to the embodiment of the present invention;

FIG. 6 is a top view showing a state in which a cassette is set in a tape printer having a tape feeding mechanism according to an embodiment of the present invention;

FIG. 7 is a side view showing a state where a cassette is set in a tape printer having a tape feeding mechanism according to an embodiment of the present invention;

FIG. 8 is a sectional view showing a tape feeding mechanism according to another embodiment of the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main frame 11 Tape feed roller 12 Tape feed roller holder 13 Tape feed roller spring 29 Tape feed roller holder shaft

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B41J 15/04 B41J 13/02-13/03 B65H 20/02-20/04

Claims (2)

(57) [Scope of request for utility model registration] And 1. A both ends torsion coil spring having a configured U-shaped portion by a spring wire rod spring center has a linear portion formed by a spring wire, the guide shaft for supporting the torsion coil spring, the Rotating the torsion coil spring in the load generation direction
Compresses the U-shaped part in the axial direction of the guide shaft.
Or after stretching, the compression or stretching force is again applied.
Guiding the U-shaped part to open,
After the U-shaped portion is fitted into the spring hooking member into which the U-shaped portion is fitted,
And a pressed member urged by a constant load.
Pressing mechanism of the printer. 2. The apparatus according to claim 1, wherein the pressed member transports a tape-shaped medium.
The pressing mechanism according to claim 1, which is a roller member for feeding.
A tape transport device.