JP3453213B2 - Reverse rotation prevention mechanism and ribbon cartridge - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reverse rotation preventing mechanism provided for preventing reverse rotation of a reel, for example, and a ribbon cartridge provided with this reverse rotation preventing mechanism.

[0002]

2. Description of the Related Art Generally, for example, a ribbon cartridge mounted on a printer such as a word processor has a reverse rotation preventing mechanism on a take-up reel which rotates in tandem with the printer to wind the ribbon in order to prevent the reverse feeding of the ribbon. It is provided.

The reverse rotation preventing mechanism provided on the ribbon cartridge forms a ratchet gear 2 on the take-up reel 1 as shown in FIG. 3, and engages with the ratchet gear 2 when the take-up reel 1 rotates in the reverse direction. The mating claw 3 is formed integrally with the body case 4 with elasticity.

[0004]

Although the above-described reverse rotation preventing mechanism has the advantage of being inexpensive and simple in construction,
When the take-up reel 1 rotates forward, the claw 3 vibrates and makes a vibration sound. Further, the claw 3 has elasticity so that the main body case 4
Since it is integrally formed on the body case 4, the body case 4 has a hole 4a.
The vibration sound of the claw 3 is transmitted from the hole 4a to the outside, which is uncomfortable.

Further, in recent years, a comfortable work environment is being promoted, and for example, operating noise generated when an OA device such as a word processor is operated is reduced. However, although the reduction of operating noise to the device body is being promoted, the present situation is that accessories such as ribbon cartridges are not considered for reducing operating noise. Therefore, there is a demand for reducing operating noise of accessories. In particular, since word processors and personal computers have been remarkably spread in recent years, there are many demands for reducing operating noise not only in word processors or personal computer bodies but also in ribbon cartridges mounted in printers.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a reverse rotation preventing mechanism capable of suppressing the generation of operating noise and a ribbon cartridge provided with this reverse rotation preventing mechanism.

[0007]

In order to achieve the above-mentioned object, a reverse rotation preventing mechanism of the present invention comprises a rotating member rotatably supported in a main body and having a ratchet gear at one end thereof. In a reverse rotation preventing mechanism having a claw formed elastically on the main body and engaging with the ratchet gear at the time of reverse rotation of the rotating member, a thin plate in which an adhesive is applied to the main body by hooking the claw It was attached, and the thin plate was made of plastic film.

Further, in the ribbon cartridge of the present invention, the above-described reverse rotation preventing mechanism is provided on the take-up reel.

[0009]

The reverse rotation preventing mechanism of the present invention comprises a rotating member having a ratchet gear at one end thereof and rotatably supported in the main body, and an elastic member formed in the main body. In a reverse rotation preventing mechanism having a pawl that engages with the ratchet gear at the time of reverse rotation, since the thin plate coated with the adhesive is attached to the main body by mounting the pawl, the adhesive applied to the thin plate is the rotating member. Suppresses the vibration of the claw that occurs during the normal rotation of the.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will now be described with reference to FIGS.
It will be described based on. FIG. 1 is a plan view showing a structure of a ribbon cartridge of the present invention, and FIG. 2 is a view showing a structure of a reverse rotation preventing mechanism provided on a take-up reel which is a component of the ribbon cartridge of the present invention. ) Is a plan view,
(B) is an AA arrow view of (a).

In FIG. 1, reference numeral 11 denotes a ribbon cartridge main body (hereinafter referred to as "main body"), which is sent from a supply reel 13 to a hole 11a into which a head of the printer is inserted by a take-up reel 12 which rotates in conjunction with the printer. The ribbon 14 is wound up after transferring the ink. Reference numeral 15 is a tape reel around which a tape 16 to which the ink of the ribbon 14 is transferred is wound and which is rotatably supported in the main body 11.

In order to prevent the ribbon 14 from being fed backward, as shown in FIG. 2, a ratchet gear 17 is formed on one end of the outer peripheral surface of the take-up reel 12 and the main body 11 is formed.
Is a reverse rotation preventing mechanism for the take-up reel 12 in which two claws 11b that engage with the ratchet gear 17 when the take-up reel 12 rotates in the reverse direction are elastically formed at 180 ° opposite positions. ing. Further, a thin plate 18 to which an adhesive is applied and a hole larger than the ratchet gear 17 is formed in the center is attached to the inner surface of the main body 11 coaxially with the take-up reel 12 by hooking the claw 11b.

The ribbon cartridge of the present invention has the above-mentioned structure. When the ribbon cartridge is used by being installed in a word processor printer, the take-up reel 12 winds the ribbon 14 and prints when the printer is operated. The tape 16 thus produced is sent out of the main body 11. At this time, the pawl 11b vibrates by the ratchet gear 17 that rotates normally with the take-up reel 12, but the vibration of the pawl 11b is suppressed and attenuated by the adhesive force of the adhesive applied to the thin plate 18.
Then, the printed tape 16 is attached to, for example, a binder or the like.

In this embodiment, the take-up reel 12 and the ratchet gear 17 are integrally formed, but if the take-up reel and the ratchet gear rotate integrally, the take-up reel and the ratchet gear are provided. May be configured separately. Further, although the thin plate 18 is attached to the inner surface side of the main body 11 in the present embodiment, the thin plate may be attached to the outer surface side of the main body.

In this embodiment, the tape reel 15 around which the tape 16 to which the ink of the ribbon 14 is transferred is wound is used as the main body 1.
Although the ribbon cartridge arranged in the first embodiment is shown, a ribbon cartridge in which ink is transferred to a paper sent by a printer without arranging a tape reel may be used.

Further, when the thin plate 18 is made of a plastic film such as PET or PP, the vibration of the pawl 11b generated when the take-up reel 12 is normally rotated can be more effectively suppressed by the elasticity of the thin plate 18 itself. is there.

[0017]

As described above, according to the present invention, a rotating member having a ratchet gear at one end thereof and rotatably supported in the main body, and the main body having elasticity is formed. In a reverse rotation preventing mechanism having a claw that engages with the ratchet gear when the rotating member rotates in the reverse direction, the claw is hung and a thin plate coated with an adhesive is attached to the main body. Suppresses the vibration of the pawl that occurs when the rotating member rotates in the normal direction, and thus the vibration sound of the pawl due to the rotating member is reduced.

Further, when the thin plate is made of a plastic film, the vibration of the nail can be more effectively suppressed by the elasticity of the thin plate itself, and the vibration noise of the nail is further reduced.

Further, in the ribbon cartridge of the present invention, since the above-described reverse rotation preventing mechanism is provided on the take-up reel, the operating noise of the ribbon cartridge is reduced, and the operating noise of the main body of the device is reduced, and a comfortable working environment is created. Is promoted.

[Brief description of drawings]

FIG. 1 is a plan view showing a configuration of a ribbon cartridge of the present invention.

2A and 2B are views showing a configuration of a reverse rotation preventing mechanism provided on a take-up reel which is a component of the ribbon cartridge of the present invention, FIG. 2A being a plan view and FIG. FIG.

FIG. 3 is a diagram showing a configuration of a conventional reverse rotation prevention mechanism,
(A) is a top view, (b) is a BB arrow line view of (a).

[Explanation of symbols]

11 body 11b nail 12 take-up reel 17 Ratchet Gear 18 thin plate

─────────────────────────────────────────────────── ───Continued from the front page (56) References JP-A-6-122239 (JP, A) JP-A-61-112830 (JP, A) Practical development Sho-60-137236 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) B41J 33/52 F16D 41/12

Claims (3)

(57) [Claims] 1. A rotating member having a ratchet gear at one end thereof and rotatably supported in a main body, and an elastic member formed in the main body, the ratchet gear being formed when the rotating member is reversely rotated. A reverse rotation preventing mechanism having engaging claws, characterized in that a thin plate coated with an adhesive is attached to the main body by hooking the claws. 2. The reverse rotation preventing mechanism according to claim 1, wherein the thin plate is made of a plastic film. 3. A ribbon cartridge comprising a take-up reel provided with the reverse rotation preventing mechanism according to claim 1 or 2.