JPS6354276A - Ribbon feeder of electro-resistance-type printer - Google Patents

Abstract

PURPOSE:To enable a clear printing operation without constituting any hindrance in winding by making ribbon slippage hard to occur, by a method wherein in a ribbon feeder a feed roller and a pinch roller are joined with a gear, and the rotation driving force of the feed roller is transmitted to the pinch roller. CONSTITUTION:A pinch roller 6 is pressed to be contacted with a feed roller 5 pinching a ribbon 4 between them, and a gear 5a is engaged with a gear 6a. Then, the rotation driving force of the feed roller 5 is transmitted to the pinch roller 6. The pinch roller 6 consists of a elastic rubber material having a large friction resistance to the ribbon 4. Therefore, any slip is hard to occur.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a ribbon feeding device for a current-carrying resistor type printer, and more particularly to a ribbon feeding device for a current-carrying resistive printer equipped with a feed roller functioning as a return electrode.

[Conventional technology]

Conventionally, this type of current-carrying resistive printer has a circuit configuration in which a predetermined signal current is passed from the print head side toward the current-carrying layer of the ribbon, and this signal current flows into the return electrode that is the end of the current-carrying path. In this case, the feed roller that applies running force to the ribbon also functions as a return electrode. The ribbon is pressed against the print paper on the platen side by the print head. In this state, the circuit configuration described above is energized, thereby printing predetermined characters and the like on the paper. In order to reduce ground resistance, the feed roller is generally formed of a cylindrical cola made of copper, which has high conductivity. Another conventional example of a feed roller is one that has numerous protrusions around which metal pieces are welded (US Pat. No. 4,329,071).

This feed roller is excellent in that it ensures conduction between the ribbon and the return electrode and smoothly winds the ribbon.

[Problems to be solved]

In the above-mentioned conventional current-carrying resistance printer, the feed roller, which is simply a cylindrical roller, has a smooth surface, which tends to cause the ribbon to slip, which hinders ribbon winding. This method not only causes problems, but also has the drawback of not being able to print clearly.

On the other hand, in the case of a feed roller with numerous metal protrusions welded around its periphery, the manufacturing process is complicated and productivity is low, and the protrusions are small, making it easy for welding defects to occur and resulting in poor durability. Ta.

[Means for solving problems]

The present invention has been made in order to solve the above-mentioned conventional problems, and as a means for solving the problem, a ribbon having a current-carrying layer is provided, and a predetermined current is applied to the ribbon by pressing this ribbon against printing paper on the platen side. A ribbon feeding device for a current-carrying resistance type printer, comprising a print head that carries electricity, a feed roller that is located on the winding side of the ribbon and serves as a return electrode for the current passed through the ribbon, and a pinch roller that presses against the feed roller. In the present invention, the feed roller and the pinch roller are connected by a gear, and the rotational driving force of the feed roller is transmitted to the pinch roller.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view showing one embodiment of the present invention. This current-carrying resistance type printer has a platen l.

A print head 3 for printing predetermined characters, etc. on the paper 2 on the platen L side, a ribbon 4 running on the paper 2 side of the print head 3, and a feed roller installed on the winding side of the ribbon 4. 5, and a pinch roller 6 for making the winding function of the ribbon 4 by the feed roller 5 more effective. The printing pad 3 has a plurality of current-carrying electrodes (not shown) in a direction perpendicular to the running direction A of the ribbon 4.
It is equipped with Each of the current-carrying electrodes is externally controlled so that it can individually output a predetermined level of current to the ribbon 4 side. In this case, the current applied separately to each electrode from the printing pad 3 passes through the current-carrying layer (not shown) of the running ribbon 4, as shown by the dotted arrow B, and is installed on the ribbon winding side. The feed roller 5 is configured to flow into the feed roller 5. And the ribbon 4 is placed on the paper 2 on the platen l.
Electricity is applied while the paper 2 is pressed against the paper 2, and thereby predetermined characters and the like are printed on the paper 2.

The pinch roller 6 pinches the ribbon 4 and transfers it to the feed roller 5.
It is designed to be pressed against the In this state, as shown in FIG. 2, the gear 5a attached to the feed roller 5 and the gear 6a attached to the pinch roller 6 mesh with each other, and the rotational driving force of the feed roller 5 is transmitted to the pinch roller 6. It is supposed to be done. Furthermore, the pinch roller 6 is made of a rubber elastic material that has high frictional resistance with the ribbon 4.

In this way, the feed roller 5 and the pinch roller 6 are connected by the gears 5a and 6a, and the rotational driving force of the feed roller 5 is transmitted to the pinch roller 6, so that the ribbon 4 is moved between the feed roller 5 and the pinch roller 6. It is fed not only by the pressure contact force but also by the frictional resistance force with the pinch roller 6, making it difficult for slips to occur.

Further, the pinch roller 6 may be formed of a rubber elastic body.
This allows for further prevention of slippage.

〔Effect of the invention〕

As explained above, in the present invention, the feed roller and the pinch roller are connected by a gear, and the rotational driving force of the feed roller is transmitted to the pinch roller. The ribbon is fed by the frictional resistance force between the ribbon and the ribbon, making it difficult for slips to occur, resulting in a clear printing operation without hindrance to ribbon winding.

Furthermore, compared to the case where metal protrusions are welded, the manufacturing process can be simplified, productivity can be improved, and durability can be improved.

[Brief explanation of drawings]

Fig. 1 is a plan view showing one embodiment of the present invention, and Fig. 2 is a plan view showing an embodiment of the present invention.
FIG. 3 is a plan view showing an enlarged portion of the feed roller and pinch roller shown in the figure. l Nibraten 2: Paper 3: Print head 4: Ripon 5: Feed roller 5a, 6a: Gear 6: Pinch roller

Claims (1)

[Claims] A ribbon having a current-conducting layer, a print head that presses the ribbon against printing paper on a platen side to apply a predetermined current to the ribbon, and a return electrode for the current applied to the ribbon on the winding side of the ribbon. feed roller,
A ribbon feeding device for a current-carrying resistance printer, which is equipped with a pinch roller that presses against the feed roller, is characterized in that the feed roller and the pinch roller are coupled by a gear, and the rotational driving force of the feed roller is transmitted to the pinch roller. Ribbon feeding device for current-carrying resistance printers.