JPH0696320B2 - Ink ribbon drive device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] The present invention relates to an ink ribbon drive device of a printing device using an ink ribbon, and a roller is opened to either one of a pair of feeding rollers that nip and drive the ink ribbon. A lever is provided, and the roller release lever is driven when the printing apparatus is stopped, so that one of the feeding rollers is separated from the other feeding roller, thereby canceling unnecessary nipping of the ink ribbon and obstructing traveling ( It prevents the occurrence of jams and prevents the print quality from deteriorating.

[Industrial application field]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink ribbon driving device having an improved mechanism of an ink ribbon feeding roller.

In recent years, information processed by an electronic computer is temporarily stored in a storage device, and necessary information among the stored information is printed by a printing device. This printing apparatus often uses an embossing die that uses an ink ribbon as a medium, and since this ink ribbon is generally sandwiched between a pair of feeding rollers and fed, it is pinched by the feeding rollers when the printing apparatus is stopped for a long time. The ink that has impregnated the ink ribbon in the exposed part adheres to the feeding roller and has adhesiveness, which causes the travel obstruction (jam) of the ink ribbon and deteriorates the print quality. There is a demand for an improved ink ribbon drive device that prevents the deterioration of the ink ribbon.

[Conventional technology]

FIG. 2 is a front view of relevant parts for explaining a conventional ink ribbon driving method.

In the figure, an ink ribbon 4 impregnated with ink is sandwiched between an A feeding roller 1 and a B feeding roller 2 via a roller 3 and runs in the arrow direction.

[Problems to be solved by the invention]

However, the A feeding roller 1 and the B feeding roller 2 are operated even after the required printing operation is completed or when the power of the printing apparatus itself is turned off.
Stops while the ink ribbon 4 is sandwiched, the ink impregnated in the sandwiched portion of the ink ribbon 4 diffuses, and the ink adheres to the roller surface and becomes tacky. When printing is restarted in this state, the ink ribbon 4
While adhering to the part of the roller having adhesiveness, the part clogs in the gap between the A-feeding roller 1 and the ribbon guide 5 as shown in the figure, causing the traveling obstruction (jam) of the ink ribbon 4. Further, the following print quality is deteriorated.

That is, FIG. 3 is a plan view showing a printing state after the printing is restarted. As described in FIG. 2, the printing is stopped for a long time in a state where the ink ribbon is sandwiched between the feeding rollers and the printing is restarted. When printed on paper 10, the characters printed with the ink ribbon that is not sandwiched between the rollers become good characters 11, and the characters that are printed with the ink ribbon that is sandwiched between the rollers and where the ink has diffused become unclear characters 12. .

[Means for solving problems]

SUMMARY OF THE INVENTION The present invention provides an ink ribbon drive device that solves the above-mentioned problems, eliminates the obstruction of running of an ink ribbon, and prevents deterioration of print quality.

That is, in a printing apparatus that uses a belt-shaped ink ribbon that is nipped and driven by a pair of take-up rollers, one of the take-up rollers is rotatably supported by a movable roller release lever and the roller is released. When the lever is connected to the cam and the printing apparatus is powered off, or when the printing operation is not performed within a predetermined time after the printing operation,
Rotating the cam to move the roller release lever,
This is solved by providing means for separating the one feeding roller from the other feeding roller.

[Action]

In such an ink ribbon driving device, if the power of the printing device is not shut down or the printing operation is not started within a predetermined time, the cam is automatically rotated by the control unit and the roller release lever and one of the repeating units are repeated. Since the take-in roller can be separated from the other take-up roller to release the nipping of the ink ribbon, the ink is prevented from diffusing, the traveling obstruction (jam) of the ink ribbon is eliminated, and the print quality is prevented from being deteriorated.

〔Example〕

FIG. 1 is a diagram schematically showing an embodiment of the present invention.
The same parts as those in the figure are designated by the same reference numerals.

In the figure, an ink ribbon 4 impregnated with ink is sandwiched between an A feeding roller 1 and a B feeding roller 2 via a roller 3 so as to run in the direction of the arrow, and one A feeding roller Reference numeral 1 is rotatably shown on a base plate (not shown). So far, there is no difference from the previous one,
In this embodiment, the other B feeding roller 2 is configured as follows.

That is, the B feeding roller 2 is rotatably supported by a roller opening lever 7, and the roller opening lever 7 has one end pivotally attached to a pin 71 planted in the base plate and the other end. Is provided with a protrusion 72 that comes into contact with the cam 8, and a pressing spring 73 is attached to the opposite side of the protrusion 72. Therefore, the B feeding roller 2 is rotatable about the pin 71 as a fulcrum and is normally pressed against the cam 8 by the pressing spring 73.

On the other hand, the cam 8 is halved in the arrow direction by the ratchet mechanism 91.
The ratchet mechanism 91 is driven by the drive control unit 92 as follows.

That is, the drive control unit 92 drives the ratchet mechanism 91 before the start of the required printing operation and after a predetermined time has elapsed after the end of the required printing operation, and rotates the cam 8 by 1/2 rotation in the arrow direction. In this case, what is important is the stop position of the cam 8, which is set as shown during the printing operation so that the roller release lever 7 presses the B feed roller 2 against the A feed roller 1, It is set so that the projection 72 pressed by the pressing spring 93 of the roller opening lever 7 fits into the recess 81 of the cam 8 during non-printing. When the protrusion 72 fits into the concave portion 81 of the cam 8, the B feeding roller 2 separates from the A feeding roller 1 that has moved in the direction of arrow C.

Therefore, the ink ribbon 4 is released from the nipping of the roller pair. As a result, the ink ribbon 4 by the feeding roller 4
The adsorption phenomenon of is prevented.

In this embodiment, the roller release lever 7 is attached to the B feeding roller 2, but the present invention is not limited to the B feeding roller 2.
It may be attached to the A feeding roller 1.

〔The invention's effect〕

As is clear from the above description, according to the present invention, it is possible to prevent the traveling obstruction (jam) of the ink ribbon and to prevent the deterioration of the print quality.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing an embodiment of the present invention, FIG. 2 is a front view of a main part for explaining a conventional ink ribbon drive device, and FIG. 3 is a printing state after printing is restarted. It is a top view. In the figure, 1 is an A feeding roller, 2 is a B feeding roller, 3
Is a roller, 4 is an ink ribbon, 5 and 6 are ribbon guides, 7
Is a roller release lever, 8 is a cam, 10 is paper, 11 is good characters, 12 is unclear characters, 71 is a pin, 72 is a protrusion, 73 is a pressing spring, 81 is a recess, 91 is a ratchet mechanism, and 92 is a drive. A control part is shown, respectively.

Claims (1)

[Claims] 1. A printing apparatus using a belt-shaped ink ribbon which is nipped and driven by a pair of feeding rollers, wherein either one of the feeding rollers is rotatably supported by a movable roller release lever (7). In addition, the roller opening lever (7) is connected to the cam (8), and the power of the printing device is shut off, or when the printing operation is not performed within a predetermined time after the printing operation, the cam (8) ) To move the roller release lever (7) to separate one of the feeding rollers from the other feeding roller (91, 9).
2) An ink ribbon drive device characterized by being provided.