JPH0736766Y2 - Ink ribbon cartridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an ink ribbon cartridge used in a typewriter or a computer printer.
The present invention relates to an ink ribbon cartridge, which is provided with a ribbon storage portion for storing an ink ribbon in a bent posture, and in which the ink ribbon is wound so as to be fed out from the ribbon storage portion and run.

[Conventional technology]

Conventionally, in the above-mentioned ink ribbon cartridge, the ink ribbon fed from the ribbon storage part is sandwiched in the thickness direction at the midway position to provide a resistance force that opposes the ink ribbon running force. Apply a predetermined tension to the ink ribbon on the side,
The ink ribbon stored in a bent posture is configured to be wound along a predetermined path in a posture without slack.

[Problems to be solved by the device]

The ink ribbons stored in the ribbon storage portion in a bent posture are easily adhered to each other due to the stickiness of the ink components or the static electricity charged in the ink ribbon. When the ink ribbons are unwound, the tension applied to the ink ribbons causes the ink ribbons to lose contact and loosen on the side below the holding position that gives resistance to the ink ribbon running force. Is likely to occur.

To solve this problem, for example, a gate with a space slightly wider than the thickness of the ink ribbon is provided in the middle of the ink ribbon feeding path from the ribbon storage section to the holding position, and It is conceivable that the gate is forcibly released at this gate when the ink ribbons whose side surfaces are in close contact with each other are unwound so that the ink ribbons are wound so as to pass through the space and are unwound. . However, the thickness of the ink ribbon is usually several 10μ.
Since the cartridge case is extremely thin, high accuracy is required for processing and assembling the cartridge case, and the ink ribbon must be inserted and installed within a narrow gate interval, which causes a new problem of lowering productivity.

The present invention has been made in view of the above situation, and by devising a gate-like structure for forcibly releasing the contact between the ink ribbons, slack in the ink ribbons and defective printing or clogging due to it can be prevented. It is an object of the present invention to easily attach an ink ribbon cartridge that can be effectively prevented.

[Means for Solving the Problems]

In order to achieve the above object, the present invention is characterized in that, in the ink ribbon cartridge described above, a scraper portion that acts on one side surface of the ink ribbon and a side surface on the other side of the ink ribbon feeding side of the ribbon storage portion. And a scraper section that acts on the ink ribbons are provided separately in a state of elastically sandwiching the ink ribbons.

Further, when both of the scraper parts are elastically biased in a state of pressing the ink ribbon in the thickness direction, even if the ink ribbon fluctuates as it is fed out, excessive tension is applied to the ink ribbon. The close contact can be effectively released without causing it.

[Action]

If both sides of the ink ribbon fed out from the ribbon storage section are sandwiched by the scraper section at the midway position of the running, and the ink ribbons whose sides are in close contact with each other are drawn out, It is difficult to cause looseness of the ink ribbon and printing defects and clogging due to the looseness of the ink ribbon by contacting either or both of the scraper parts, but disposing the two scraper parts at a narrow interval. Instead of fixing, since the ink ribbon is elastically sandwiched between the scraper portions that act on each of the ink ribbon side surfaces, each of the scraper portions can be brought close to the ink ribbon side surface, High accuracy is not required for the scraper assembly, and when installing the ink ribbon between the scraper parts, And spread against the between over path portion to the elastic force can be easily mounting the ink ribbon therebetween.

Further, since both sides of the ink ribbon are elastically sandwiched by the scraper portion, even if the loose ink ribbon is fed out from the ribbon storage portion, the scraper portion can act on both sides of the ink ribbon. it can.

If both scraper parts are elastically urged to press the ink ribbon in the thickness direction, even if the ink ribbon fluctuates slightly in the direction intersecting with the drawing direction, both scraper parts Can be made to follow the fluctuation.

[Effect of device]

According to the ink ribbon cartridge of claim 1, each of the scraper portions can efficiently act on the side surface of the ink ribbon, so that the slack of the ink ribbon and the defective printing or clogging caused thereby can be effectively prevented. The scraper portion does not need to be assembled with high precision, and the ink ribbon can be easily mounted between the scraper portions, so that the scraper portion can be easily assembled.

Further, even if the ink ribbon fed from the ribbon storage portion is slack, the scraper portion can be made to act on both side surfaces of the ink ribbon, and the close contact of the ink ribbon can be reliably released.

In the ink ribbon cartridge according to the present invention, even when the ink ribbon swings in a direction intersecting with the feeding direction of the ink ribbon, both scraper parts can follow the swing, so that excessive tension is applied to the ink ribbon. The close contact between the ink ribbons can be reliably released without causing any trouble.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an ink ribbon cartridge of an endless ink ribbon (R) coated with a liquid or gel oily ink, which integrally forms a pair of left and right ribbon guide arms (1A) and (1B). The main body case (1) comprises a synthetic resin main body case (1) and a synthetic resin cover plate (2) for closing the upper opening of the main body case (1), The impact dot head (H) is capable of printing the ink ribbon (R) that is stretched between the pair of arms (1A) and (1B).

The main body case (1) is provided with elongated rectangular ribbon storage portions (3) on the left and right sides capable of folding and storing a main portion of the endless ink ribbon (R) in a fan-hold shape. On the inlet side of the ribbon storage section (3) and on both sides of the running path of the ink ribbon (R), there are a large-diameter drive feed roll (4) driven by power from a printer and a small-diameter drive feed roll (4). A driven feed roll (5) is attached, and by driving these feed rolls (4) and (5),
The ink ribbon (R) fed from the outlet of the ribbon storage section (3) is caused to travel along the ribbon traveling path, and the ink ribbon (R) is stored in the ribbon storage section (3) while being folded into a fan-hold shape. It is configured to do so.

A fixed wall (7) having a ribbon passage (6) for passing the ink ribbon (R) is provided on the outlet side of the ribbon storage portion (3), and the ink ribbon (R) is directed toward the ribbon passage (6). 2) is provided with a guide member (3a) for smooth movement, and a leaf spring (8) and a receiving member (9) formed on the side wall of the main body case (1) to receive the biasing force of the leaf spring (8). In addition, a scraper portion (8a) acting on one side surface side of the ink ribbon (R) fed out from the ribbon passage (6) and a scraper portion (9a) acting on the other side surface side thereof are provided with a leaf spring (8). ), The ink ribbons (R) are elastically sandwiched between each other, and are separately provided.

As shown in FIG. 2, the leaf spring (8) is provided with a scraper portion (8a) capable of contacting the side surface of the ink ribbon (R) over its entire width, and the receiving member. (9) is a flat plate whose cross-sectional shape when viewed in the ink ribbon width direction intersects an arcuate surface (9b) and this arcuate surface (9b), and the intersecting part (9a) functions as a scraper part. A flat surface (9c) and a curved surface (9d) continuous with the flat surface (9c), and the flat surface (9c) is formed.
The leaf spring (8) is received almost entirely in (c), and the biasing force of the leaf spring (8) acts in a distributed manner on the ink ribbon (R).

Then, the ink ribbon (R) is clamped in the thickness direction by the biasing force of the leaf spring (8) to give a resistance against the running force of the ink ribbon, and the ink ribbons (R) are in close contact with each other. The ink ribbon (R) that forms the close contact portion directly or when the close contact portion forms the scraper portions (8a) and (9b) over the entire width of the ink ribbon (R).
Either or both of them are brought into contact with each other to forcibly release the close contact.

[Another embodiment]

3 and 4 show that both the scraper portion (10a) acting on one side surface of the ink ribbon (R) and the scraper portion (11a) acting on the other side surface of the ink ribbon (R) have the ink ribbon (R). Another embodiment is shown in which the plate is elastically urged in the thickness direction, and the two pressing members (10) and (11) in which the leaf springs are bent in a dogleg shape are pressed against each other. These two pressing members (10) and (11) are pivotally supported by the fixed wall (7).
Then, the ink ribbon (R) is elastically held by a holding force equal to or less than the pressing force of a leaf spring (8) described later, and the tip end portions of these pressing members (10) and (11) are scraper parts. When the ink ribbons (R) formed on (10a) and (11a) are drawn out in a state in which they are in close contact with each other, the close contact portion is directly or the ink ribbon (R) forming the close contact portion is the entire ribbon. Scraper part (10
It is configured such that the contact is forcedly released by contacting either or both of a) and (11a).

The ink ribbon (R) that has passed through the scraper parts (10a) and (11a) is once fed by the guide member (12) in a direction substantially orthogonal to the pressing direction of the pressing members (10) and (11). After that, it is held by the leaf spring (8) and a resistance force against the running force of the ink ribbon is given, and it is guided to the ribbon guide arm portion (1A).

Further, as shown in FIG. 5, when the ink ribbon (R) housed in a bent posture moves while fluctuating in a direction crossing the side surface of the ink ribbon (R),
Corresponding to the fluctuation, the pressing positions of the pressing members (10) and (11) are elastically displaced and follow, and the ink ribbon (R) is surely applied without applying an excessive pulling force. R) It is configured so that the close contact between them can be released.

In the above another embodiment, when the holding force of the pressing members (10) and (11) can give a resistance force against the ink ribbon running force to the ink ribbon (R), the leaf spring (8) described above is used.
You may omit the holding structure by.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the structure of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of the ink ribbon cartridge according to the present invention. FIG. 1 is a partially cutaway overall plan view, and FIG. 2 is an enlarged view of essential parts. FIG. 3, FIG. 4 and FIG. 5 show another embodiment, FIG. 3 is a partially cutaway overall plan view, and FIG. 4 and FIG. 5 are enlarged views of essential parts. (3) ... Ribbon storage, (8), (9), (10),
(11) …… Pressing member, (8a), (9a), (10a), (11
a) …… Scraper part, (R) …… Ink ribbon.

Claims (2)

[Scope of utility model registration request] 1. A ribbon container (3) for accommodating an ink ribbon (R) in a bent posture is provided, and the ink ribbon (R) is wound from the ribbon container (3) so as to run and run. In the ink ribbon cartridge, the scraper portions (8a), (10a) acting on one side surface side of the ink ribbon (R) and the other side surface side of the ribbon storage portion (3) on the ink ribbon feeding side. An ink ribbon cartridge characterized in that scrapers (9a) and (11a) that operate are provided separately in a state of elastically sandwiching the ink ribbon (R) with each other. 2. The ink ribbon cartridge according to claim 1, wherein both of the scraper portions (10a) and (11a) are elastically biased to press the ink ribbon (R) in the thickness direction.