JPS62183373A - Ribbon feeder for current-sensitized resistor type printer - Google Patents

Abstract

PURPOSE:To contrive a lower electric resistance of a current-passing part and a smoother take-up and feeding of a ribbon, by firmly fitting rings formed from a conductive material and provided with projections, to outer peripheral parts of a feeding roller. CONSTITUTION:A head part 5A of a feeding roller 5 is provided with four annular recessed grooves 5B, in each of which is fitted a ring 5C provided with projections and having a part cut away. The rings 5C are formed of a conductive material. While the roller 5 is rotated in the direction of an arrow C, the projections 7 on the rings 5C break through a resistor layer 4A of a ribbon 4 to reach a current-passing layer 4B, whereby an electric current flowing through the layer 4B is permitted to flow directly into the roller 5 through the projections 7. As a result, the electric resistance between the current-passing layer 4b of the ribbon 4 and the roller 5 is markedly reduced, and the ribbon is smoothly fed to the take-up side under the fastening actions of the projections 7. Further, the projections 7 can be extremely easily provided by a blanking operation.

Description

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

C. Prior Art] Current-carrying resistive printers employ 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 a return electrode that forms the end of the current-carrying path. ing. 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 paper on the platen side by the print head. Under this state, the circuit configuration described above is energized, thereby printing predetermined characters and the like on the paper.

The feed roller is generally formed of a highly conductive copper-based cylindrical roller in order to reduce ground resistance. Another conventional example of a feed roller is one with numerous protrusions made by welding metal pieces around the periphery (U
, S, Pachin) 隘4329071).

This feed roller is excellent in ensuring continuity between the ribbon and the return electrode and in smoothly winding the ribbon.

[Problem that the invention seeks to solve]

However, in the conventional feed roller consisting of a roller simply formed in a cylindrical shape, the current applied from one print head flows to the feed roller through the resistance layer of the ribbon, so that the entire current-carrying circuit is This has the disadvantage that the electrical resistance value becomes higher than necessary. Also,
Since the surface is smooth, slippage is likely to occur, and this has the disadvantage that a clear printing operation cannot be achieved without causing any bumps that may interfere with the winding of the revoi.

On the other hand, a feed roller with numerous metal protrusions welded around its periphery complicates the manufacturing process, resulting in problems such as poor productivity and poor durability due to the small protrusions that tend to cause poor welding.

[Purpose of the invention]

The present invention improves the disadvantages of the conventional example, reduces the electrical resistance of the current-carrying part for printing, allows smooth winding of the ribbon, and at the same time improves the durability of the entire device. The object is to provide a ribbon feeding device for a printer.

[Means for solving problems]

The present invention includes a ribbon having a current-conducting layer, a print head that applies a predetermined current to the ribbon while the ribbon is pressed against paper on a platen side, and a print head that is installed on the winding side of the ribbon and that applies a predetermined current to the ribbon. and a feed roller that functions as a return path electrode for the current. Among these, the feed roller has a plurality of protrusions on the outside and a ring with protrusions formed of a conductive member is fixedly attached to the outer peripheral portion of the feed roller.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

The embodiment shown in FIG.
A print head 3 for printing predetermined characters etc. on the paper 2 on the side, and a ribbon 4 running on the paper 2 side of the print head 3.
It has a feed roller 5 installed on the winding side of the ribbon 4, and a pressure roller 6 for making the function of winding the ribbon 4 by the feed roller 5 more effective.

The ribbon 4 has a resistive layer 4A and a conductive layer 4 as shown in FIG.
B and a solid ink film 4C, and is arranged so that the solid ink film 4C can run and move toward the paper 2 side.

The print head 3 includes a plurality of current-carrying electrodes (not shown) in a direction perpendicular to the running direction A of the ribbon 4. 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 print head 3 is applied to the running ribbon 4 as shown by the dotted arrow B in FIG.
The ribbon 4 passes through the current-carrying layer 4B and flows into the feed roller 5 installed on the ribbon winding side, and the ribbon 4 is energized while being pressed against the paper 2 on the platen 1.
As a result, predetermined characters and the like are printed on the paper 2 in the same manner as in the conventional example described above.

As shown in FIG. 3, the feed roller 5 has four
It has an annular groove 5B. As shown in FIG.
C is inserted. The protruded ring 5C is made of a conductive member and has a spring effect in the inner diameter direction.

FIG. 5 shows a completed assembly diagram when the protruding ring 5C is fitted into each annular groove 5B.

When the printing operation is started with the arrangement shown in FIG. 1, the feed roller 5 rotates in the direction of arrow C as shown in FIG. The current flows through the resistance layer 4A and reaches the energized Ji4B. The current flowing through the current-carrying layer 4B flows directly into the feed roller 5 through the protrusion 7 of the protruded ring 5C. As a result, there is an advantage that the electrical resistance between the current-conducting layer 4B of the ribbon 4 and the feed roller 5 is significantly reduced, and the ribbon 4 is smoothly fed to the winding side by the locking action of the protrusion 7. Furthermore, the protrusion 7 is connected to the ring 5
Since it is integrated into C, accidents such as detachment of the protrusion 7 are eliminated, and overall durability can be improved. performance has been significantly improved.

In addition, in the said Example, although the case where the number of protrusion rings 5C is four was illustrated, the case where there is one or two may be sufficient. Furthermore, in the above embodiment, the protrusion ring 5C
Although the case where the annular groove 5B is equipped is illustrated,
The present invention is not necessarily limited to this, but by providing a suitable locking means, the protruded ring 5C can be attached to the feed roller 5.
It is also possible to have a structure where it is installed directly on the outer periphery of the

Further, as shown in FIG. 6, if a structure is adopted in which bent portions 8 directed inward are provided at both ends of the ring with protrusions 5C, and the bent portions 8 are locked at most portions 9 within the annular groove 5B, This has the advantage that rotation can be reliably suppressed and durability can be further improved.

〔Effect of the invention〕

In the present invention, since the feed roller is fixedly equipped with a ring with a protrusion, the ribbon can be reliably retained and run. When the ribbon is rolled up, the protrusions are embedded into the current-carrying layer, so the electrical resistance of the return electrode portion of the current-carrying circuit can be significantly reduced, thereby reducing the overall resistance of the current-carrying circuit and increasing the power consumption. losses can be reduced. Furthermore, since the ribbon locking protrusions are integrally formed on the ring member by pressing or the like, there is no need to weld the protrusions, and therefore productivity and durability can be significantly improved. In the event of damage during use, it is possible to easily replace only the protruding ring and continue using the ribbon feed device for a current-carrying resistance type printer, which is unprecedented and excellent.

[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.
3 is a perspective view showing the head of the feed roller before attaching the ring with projections; FIG. 4 is a perspective view showing an example of the ring with projections; FIG. 5 is a front view showing the feed roller with a protruding ring attached thereto, and FIG. 6 is a sectional view showing another example of the feed roller. l°°゛...°Platen, 2...Paper, 3...
...Go to printing. 4... Ribbon, 4B... Current carrying layer,
5...°/°° feed roller, 5C... ring with protrusion, 7... protrusion. Patent applicant: Japan Electric Co., Ltd. Figure 2

Claims (1)

[Claims] (1) A ribbon having a current-conducting layer, a print head that applies a predetermined current to the ribbon while pressing the ribbon against the paper on the platen side, and a print head that is installed on the winding side of the ribbon and applies the current to the ribbon. A ribbon feeding device for a current-carrying resistive printer, which is equipped with a feed roller that functions as a return path electrode for a current flowing through the feed roller; A ribbon feed device for a current-carrying resistance type printer, characterized by being fixedly equipped with.