JP2559637Y2 - Guide roller assembly structure for 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 assembly structure of a guide roller for guiding the running of an ink ribbon loaded in an ink ribbon cassette.

[0002]

2. Description of the Related Art Ink ribbons tend to vibrate in the width direction of the ribbon during running, and are unlikely to vibrate due to differences in the type of base material and ink, the slipperiness of the back side of the ribbon, and the like. There is a possibility that the ink ribbon which is easily vibrated may not be able to hold the relative position between the print head and the ink ribbon at an appropriate position.
A guide roller that guides the running of the ink ribbon is fixed non-rotatably to give resistance to the movement of the ink ribbon in the width direction. The aim is to reduce running resistance. In addition, since molding the cassette case members separately for two types of cassette cases only by the difference in the assembly structure of the guide rollers leads to an increase in the manufacturing cost, conventionally, there is provided a bearing hole capable of supporting the guide rollers. When the cassette case member and the guide roller are separately molded, and the cassette case member and the guide roller are used as a common member to manufacture a cassette case in which the guide roller is rotatably supported, the guide roller is used. When a cassette case in which a guide roller is fixed so as to be non-rotatable is supported by a bearing hole of a cassette case member, the guide roller is inserted into a bearing hole of the cassette case member and is adhesively fixed with an adhesive. .

[0003]

As described above, when manufacturing a cassette case in which a guide roller is non-rotatably fixed, the guide roller is inserted into a bearing hole of the cassette case member, and is fixed with an adhesive. Therefore, there is a disadvantage that the adhesive protruding from the bearing hole may be hardened as it is, and the running ink ribbon is easily caught by the hardened adhesive, which is likely to hinder the running of the ink ribbon. The present invention has been made in view of the above circumstances, and by devising a fixing structure of a guide roller, a guide roller set of an ink ribbon cassette that can smoothly run an ink ribbon even if the guide roller is fixed so as not to rotate. It is intended to provide a mounting structure.

[0004]

In order to achieve the above object, the guide roller assembly structure of the ink ribbon cassette according to the present invention is characterized by a rotating guide roller or a fixed guide having a locking member protruding from the outer peripheral surface. A bearing hole capable of selectively supporting a roller is integrally formed with the cassette case member, and the engaging portion capable of engaging the locking member in a position in which the fixed guide roller is supported by the bearing hole is formed by the bearing. It is formed integrally with the cassette case member outside the hole, and the following operation and effect can be obtained from this configuration.

[0005]

When manufacturing a cassette case in which a guide roller is rotatably supported, a rotary guide roller is supported by a bearing hole of the cassette case member, and a cassette case in which the guide roller is fixed so as not to rotate is manufactured. Sometimes, the fixed guide roller is pivotally supported in the bearing hole of the cassette case member while the locking member is engaged with the engagement portion, and the fixed guide roller is fixed in a detent state by the engagement between the locking member and the engagement portion. .

[0006]

According to the present invention, the fixing guide roller is fixed non-rotatably without using an adhesive, so that the adhesive protruding from the bearing hole is not solidified and hinders the running of the ink ribbon. In particular, since the engaging portion is formed outside the bearing hole, the engaging member of the fixed guide roller is engaged in the notch formed in the inner peripheral surface of the bearing hole. As compared with the case where the fixed guide roller is fixed so as not to rotate, when the rotary guide roller is rotatably supported by the bearing hole, the rotary guide roller is less likely to rattle in the radial direction.

[0007]

[First Embodiment]

3 and 4 show an ink ribbon cassette, in which a heat-sensitive ink ribbon is inserted into a cassette case 1 constituted by vertically fitting a main body cassette case member 1a made of ABS resin and a lid-side cassette case member 1b made of ABS resin. R is loaded. On one side of the cassette case 1, a pair of left and right concave portions 2 is formed to allow the print head H of the printer to enter when the printer case is mounted on the printer side. A ribbon core 3 that winds an ink ribbon R in which a hot-melt ink is provided on a base film such as a polyethylene terephthalate (PET) film or the like in a pancake shape is supported only rotatably. Engagement projections 3 that engage with the drive shaft on the printer side are respectively provided on the inner peripheral surfaces of the two ribbon cores 3.
a, and the two ribbon cores 3 are exchanged between the take-up side and the pay-out side by mounting the cassette case 1 upside down with respect to the printer, and the upper half and the lower half of the ink ribbon R in the width direction thereof. It is configured so that it can be used once at a time. The ink ribbon R is wound around a fixed guide roller 4, a fixed guide 5, a rotation guide roller 6 provided on each of the left and right sides of the recess 2, and a rotation guide roller 6 provided between the left and right recesses 2. By driving and rotating the ribbon core 3 to the winding side, these fixed guide rollers 4, fixed guides 5,
The vehicle travels while being guided by the rotation guide roller 6. A leaf spring 7 for holding the ink ribbon R between the fixed guide roller 4 and applying a back tension to the ink ribbon R is engaged with the side wall of the cassette case 1.

As shown in FIG. 1, the fixed guide roller 4 is formed of a polyacetal resin in a cylindrical shape separately from the main body cassette case member 1a, and is provided on the outer peripheral surface between the large-diameter portions 4a formed at the upper and lower ends. Has a plate-shaped locking member 4b projecting in the radial direction. The upper and lower large-diameter portions 4a of the fixed guide roller 4 are supported by bearing holes 8 formed in each of the main body cassette case member 1a and the lid side cassette case member 1b, and the locking member 4b is fixed together with the main body cassette case member 1a. The fixed guide roller 4 is fixed so as to be non-rotatably engaged with the integrally formed engaging portion 9. The engagement portion 9 is formed on the side of the entrance of the bearing hole 8 and is formed in a groove shape surrounded by the back surface of the fixed guide 5 and the walls 10 and 11. The cassette case 1 is, for example, an ink ribbon that is likely to vibrate in the ribbon width direction during traveling due to a difference in the type of the base material and the ink, the slipperiness of the back surface of the ribbon, and the like, such as an ink ribbon r that can be used repeatedly. r can be loaded,
In this case, instead of the fixed guide roller 4 described above,
As shown in FIG. 2, a cylindrical rotation guide roller 12 made of polyacetal resin is rotatably supported by the bearing hole 8.

[Second Embodiment] FIGS. 5 and 6 show a fixed guide roller 4 and its locking member 4.
Another embodiment of the engaging portion 9 capable of engaging the b is shown, and this fixed guide roller 4 is provided with an L-shaped bent locking member 4b instead of the locking member 4b shown in the first embodiment. The engaging portion 9 is provided with a hole integrally formed in the main body cassette case member 1a, into which the bent end portion of the locking member 4b is fitted along the ribbon width direction. Other configurations are the same as in the first embodiment.

[Other Embodiments] a. The shape of the fitting surface between the rotating guide roller and the fixed guide roller and the bearing hole may be formed as a tapered surface whose diameter decreases toward the shaft end. With such a configuration, the fitting operation of the rotating guide roller and the fixed guide roller into the bearing hole can be easily performed. I. The locking member may be formed by projecting a short columnar pin.

[0011] In the claims of the utility model registration, reference numerals are written for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

[Brief description of the drawings]

FIG. 1 is a view taken along line II of FIG. 3;

FIG. 2 is a sectional side view of a main part in a state where a rotation guide roller is assembled.

FIG. 3 is a partially cutaway plan view showing the inside of the ink ribbon cassette.

FIG. 4 is a side view of the ink ribbon cassette.

FIG. 5 is a sectional side view of a main part showing another embodiment.

FIG. 6 is a plan view taken along line VI-VI of FIG. 5;

[Explanation of symbols]

 1a Cassette case member 4 Fixed guide roller 4b Locking member 8 Bearing hole 9 Engagement part 12 Rotation guide roller

Claims (1)

(57) [Scope of request for utility model registration] A cassette case has a bearing hole (8) which can selectively support a rotating guide roller (12) or a fixed guide roller (4) having a locking member (4b) protruding from an outer peripheral surface. An engaging portion (9) integrally formed with the member (1a) and capable of engaging the locking member (4b) in a posture in which the fixed guide roller (4) is pivotally supported in the bearing hole (8) is provided on the bearing. The cassette case member (1) is provided outside the hole (8).
The guide roller assembly structure of the ink ribbon cassette integrally formed with a).