JPS61158489A - Ink ribbon cassette - Google Patents

Abstract

PURPOSE:To prevent an ink ribbon cassette from being electrically charged, by a simple and inexpensive method wherein a conductive sheet is laid between an inner surface of a cassette casing and an ink ribbon, and the casing and a cassette cover are provided with a plurality of ports for electric discharge. CONSTITUTION:The conductive sheet 9 is laid between the inner surface of the cassette casing 2 and the ink ribbon 6, and the bottom surface of the casing 2 and the cassette cover 3 are provided with relatively small diameter ports 10, 11 for electric discharge over substantially entire areas thereof. When the ink ribbon cassette is fitted to a carriage and printing is conducted, electrostatic charges are generated due to friction of a printing head with the ink ribbon 6 or friction of the casing 2 with reels 4, 5, and the interior of the cassette tends to be electrically charged to a high voltage. However, the electrostatic charges inside the cassette are easily discharged toward the conductive sheet 9, and can be discharged to the exterior through the ports 10, 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to the structure of an ink ribbon cassette used in thermal transfer printers, wire dot printers, typewriters, etc.

[Prior art]

Recording devices such as gritters and facsimiles, as well as typewriters, have an ink ribbon cassette mounted on a carriage that moves along the paper, and are configured to transfer ink while feeding the ink ribbon between the print head and the paper. ing.

The ink ribbon cassette has a structure in which a supply reel and a take-up reel are provided in a cassette case, and the ink ribbon P on the supply reel is wound onto the take-up reel through the print head insertion part during printing operation. . The take-up reel is driven by a drive shaft provided in the middle
Rotation drive drive. Further, the cassette case is closed by attaching a cassette lid.

The cassette case ε and the cassette lid are generally made of a non-conducting material such as gelastec, and during the printing operation, the cassette, ink ribbon, etc. are bound due to the following reasons.

1) Friction between the print head and 1 ton of ink 11) Friction between the cassette case and each reel 1) Friction between the cassette case and the ink ribbon Iv) Transfer process of ink to paper ■) 91 ink is on the supply reel Due to the process of peeling off from above, the following problems occur.

1) A rider touches the cassette and gets an electric shock.

11) Data signals and operation signals from the CPU may be disturbed due to the cassette band, causing the device to malfunction or stop.

111) Satin elements such as the CPU may be damaged depending on the band of the cassette.

Therefore, in order to eliminate this charging problem, conventionally,
Various countermeasures have been proposed, including a method to dissipate the charge by installing a static elimination pusher. However, with this method,
There is a problem with appearance processing K1.1, and furthermore, the equipment becomes larger and the cost increases.

Another method is to add a ground wire, capacitor, or shield plate to the control circuit for electrical processing. However, this method also results in a complicated and large circuit configuration, which increases costs.

〔the purpose〕

An object of the present invention is to solve the above-mentioned conventional problems and to prevent charging of an ink IJ yjf cassette with a simple and inexpensive method.

CfjA Kei] The present invention achieves the above object by installing a conductive sheet between the inner surface of the cassette case and the ink hole, and forming a plurality of discharge holes in at least one of the cassette case and the cassette lid. The goal is to achieve the following.

〔Example〕

The present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an embodiment in which the present invention is applied to a thermal transfer recording device.

In FIG. 1, an incremental cassette 1 has a complete housing including a cassette case 2 and a cassette lid 3, and a supply reel 4 and a take-up reel 5 are disposed inside the cassette case 1.
is pivoted and increments on the supply reel? Winding /6? )
+)- It is configured to be wound onto a roll 5. A recess 7 for inserting a print head (a thermal head in the illustrated example) is formed on the front side of the cassette case 2, and the ink printer ♂/6 is guided to pass through the recess.

When the cassette 1 is mounted on the cassette, the drive shaft on the carriage engages the take-up reel 51C, and the print head is inserted into the recess 7, driving the take-up reel 51C. The IJ'n 6 travels through the recess 7 from above the supply reel 4 and is wound onto the take-up reel 5.

In addition, the cassette lid 3 is used to store the cassette when transporting the cassette. A hole 8 is formed for inserting a loosening stopper to prevent the screw from loosening.

As shown in FIGS. 2 and 3, a conductive sheet 9 is provided between the inner surface of the cassette case 2 and the ink tank 6. As shown in FIGS.

As the sheet 9, a metal foil, metal grains, or a conductive glass sheet mixed with carbon can be used.

In addition, the cassette case 2 and the cassette lid 3 include:
As shown in FIGS. 4 and 5, a plurality of discharge ports 10 and 11 are respectively formed.

In the illustrated example, a large number of relatively small diameter openings 10 are formed across the entire bottom surface of the cassette case 2, while the cassette lid 3 also has a large number of relatively small diameter openings 10. A large number of relatively small diameter ports 11 are formed throughout the entire area.

When printing with the ink ribbon cassette 1 mounted on the carriage, the print head and ink cartridge are connected to each other. 76 and the friction between the cassette case 2 and each reel 4.5, static electricity is generated and the inside of the cassette 1 tends to become charged at a high voltage, but according to the illustrated embodiment, Since the conductive sheet 9 is laid between the cassette case 2 and the ink clip pin 6, and a plurality of discharge holes 10 and 11t are formed, the electric charge inside the cassette 1 can easily flow toward the conductive sheet 9. It can be discharged and further discharged to the outside through the ports 10 and 11. In this way, charging inside the cassette 1 can be easily prevented.

Therefore, if problems occur due to charging, such as electric shock to the user or malfunction of the device due to disturbance of electrical signals,
Furthermore, the problem of damage to components such as the CPU can be easily solved.

In the illustrated example, a large number of ports 10 and 11 are formed in both the cassette case 2 and the cassette lid 3, but in some cases, a sufficient discharge effect can be obtained by forming ports only in either one. It is possible to achieve the same effect.

Regarding the number of ports 10 and 11, in addition to providing a large number of small diameter ports as shown in the figure, relatively large diameter ports may be provided at several locations.

Furthermore, the shape of the one-way opening 10.11 is not limited to a circular shape, but can be polygonal or elongated, and can also be shaped like a slit.

〔effect〕

As is clear from the above description, according to the present invention, a dosing sheet is provided between the inner surface of the cassette case and the ink ribbon, and an atO port for discharging is provided in at least one of the cassette case and the cassette lid. Therefore, charging inside the cassette can be easily prevented.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the ink lipin cassette according to the present invention with the cassette lid separated, Fig. 2 is a plan view of the cassette case and conductive sheet shown in Fig. 1, and Fig. 3 shows the central part of Fig. 1. Longitudinal cross-sectional view. 4 is a plan view of the cassette case shown in FIG. 1, and FIG. 5 is a plan view of the cassette lid shown in FIG. 1. 11...Ink soge/cassette. 2...Cassette case. 3...@1 cassette lid. 9... Conductive sheet. 10.11... Entrance. -Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Procedure amendment writing method) May 10, 1985

Claims (1)

[Claims] (1) An ink ribbon cassette in which a conductive sheet is provided between the inner surface of the cassette case and the ink ribbon, and a plurality of discharge ports are formed in at least one of the cassette case and the cassette lid.