JPS6099685A - Ink ribbon device - Google Patents

Abstract

PURPOSE:To enable to confirm a center-over state of a pressing spring and eliminate danger of making a cassette defective due to overpressing of a spring member, by providing an operating button at a specified part as a center-over means for the pressing spring. CONSTITUTION:A reversing pressing member for changing the pressing force between an ink-impregnated roller 28 and an ink-transferring roller 26 by utilizing a center-over state of the spring member 29 is provided, and the operating button 31 for bringing the pressing member into the center-over state is provided at a hole part 30 provided at a side surface of a main body 13 of the ink ribbon cassette. When printed images become unclear after the ribbon is used for a long period of time, a projected part 31b of the button 31 is pushed by a finger or the like to bring the spring member 29 into the center-over state, whereby the pressing force between the roller 28 and the roller 26 is increased, and the amount of the ink supplied to the ink ribbon 12 is increased, thereby enabling to clearly print.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an ink ribbon device used in printing devices such as dot impact printers and typewriters.

Conventional structure and its problems Conventionally, when ink is stored, λ1. Ink 1'! ,'i
An ink ribbon device having an ink-impregnated roller and configured to transfer ink from the ink-impregnated roller to an ink ribbon may be used if the ink decreases and print clarity is lost after long-term use. In order to make full use of the ink impregnated in ρJ1υ1 without replenishing the ink to the ink impregnation roller at an angle of . has been adopted.

FIG. 1 shows a conventional example of increasing the clarity of printing by increasing the pressing force of an ink transfer roller against an ink impregnation roller.

First, the ink ribbon 1 is given an arching force by the pulling cover 2, and the ink transfer roller 3 is moved in the B direction by the tension of the ink ribbon 1 in the A direction. At the same time, the ink transfer lawn 3C1 is guided by the ink transfer lawn guide 4, slides in the C direction, and comes into pressure contact with the ink impregnating roller 5, thereby rotating the ink impregnating roller 6 in the D direction, thereby removing the ink from the ink impregnating roller 5. is transferred onto the ink ribbon 1. If the ink decreases after long-term use and the clarity of printing is lost, the pressing spring 6 consisting of a spring part is passed through the hole 8 on the side of the ink ribbon cassette body 7, and the center is overturned in the direction of the arrow. The amount of ink transferred from the ink-impregnated roller 5 to the ink ribbon 1 is increased by creating the state indicated by the broken line. At this time, as a means for over-centering the suppression spring, this was accomplished by inserting the tip of a ballpoint pen 9 or the like from the outside into a hole 8 in the side surface of the ink ribbon cassette body 7.

However, as shown in FIG. 2, in the ink supply section 10, the ink ribbon cassette main body 7 and the ink ribbon cassette lid 11 are closed by boss fitting, so it is difficult to confirm the inverted position due to center over of the suppression spring 6. However, since the ink ribbon cassette is inserted with the tip of a ballpoint pen or the like, there is a risk that the ink ribbon cassette may be pushed without limit, resulting in a defective ink ribbon cassette.

OBJECTS OF THE INVENTION In view of the above-mentioned drawbacks, the present invention aims to provide a highly reliable ink ribbon device that does not push away the spring layer and allows confirmation of reversal of the spring member.

Structure of the Invention The present invention provides an operation button between the position before the center over of the spring member and the inner wall of the ink ribbon cassette main body as a means for center over of the spring portion 4A to increase the clarity of printing. The above purpose is achieved by pushing the .

Description of examples Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 3, the ink ribbon 12 has a drive gear 15 provided to be rotated by a rotation means (not shown), and is driven by a drive gear support member 14 fixed to the ink ribbon cassette body 13. One side is supported. The ink ribbon 12 is still in the ink ribbon cassette body 1.
It is supported by a driven gear support member 17 that is rotatable about a support lTl1116 provided inside the 3, and is supported by a driven gear pressing spring 18. The other side is supported by a rotatable driven gear 19 that is pressed against the drive gear 15. The ink ribbon 12 is then drawn into the ink ribbon storage chamber 20 by 150 rotations of the drive gear.
The ink ribbon is stored in the ink ribbon storage chamber 20 while being folded irregularly. The ink ribbon 12 sent out from the ink ribbon storage chamber 20 is stored in the ink ribbon cassette body 1.
3 and is guided to run through the first passage 21 within Further, the ink ribbon 12 is made of a spring member.
Tension is applied by a tension spring 22 that withstands tension to
The ink ribbon moves horizontally to the printing position 23 and enters the second passage 24 inside the ink ribbon cassette 1 body 13 again.

In the next step, the ink transfer roller 26 is rotated in the direction of arrow B' by the ink transfer roller guide 25 in the ink ribbon cassette body 13 due to the running tension of the ink ribbon 12 in the direction of arrow A', and the ink transfer roller 26 is rotated in the direction of arrow C'. The ink impregnation roller 28, which slides in the direction of arrow D' and allows the ink transfer roller 26 to freely rotate around a fixed shaft 27 formed integrally with the ink ribbon cassette body 13, is indicated by the arrow D'.
Rotate in the direction. The rotation of the ink-impregnated roller 29 causes the ink impregnated in the ink-impregnated roller 28 to adhere to the ink ribbon 12 via the ink transfer roller 26, so that ink is supplied to the ink ribbon 12. The ink ribbon 12 supplied with ink is moved again to the drive gear 16.
The ink ribbon is fed into the ink ribbon storage chamber 2o and separated by rotation between the ink ribbon and the driven gear 19. In addition, the ink ribbon cassette body 13 includes an ink transfer roller 26 and an ink impregnation roller 2.
In order to change the pressing force with respect to 8, a pressing spring 29 consisting of a spring portion is installed with both ends supported. Furthermore, as shown in FIG.
A flat plate 31 is provided between the hole 30 and the pressing spring 29.
An operation button 31 having a protrusion 31b is provided at a. That is, the protrusion 31b is inserted into the hole 30, and the ink ribbon is pressed! An operation button 31 is provided so that the ink ribbon is extended to the outside of the main body 13 and pressed against the inner wall of the main body 13 by the force of the ink ribbon 29.

In a configuration like '2', l! 7JJ! At the IJ stage, the pressing spring 29 is positioned so that the operation button 31 can be pressed against the inner wall of the ink ribbon cassette body 13, as shown in FIG. Replenishment is performed only by the pressing force between the ink transfer roller 27 and the ink impregnation roller 28, which is a component of the running tension of the ink ribbon 12. If the printing becomes unclear after long-term use, please contact the protrusion 3 of the operation button 31.
By pushing 1b in the direction of the arrow with a finger or the like, the suppression spring 3o is moved over the center as shown in FIG. When the amount of ink is increased and the supply of ink to the ink ribbon 12 is increased, the printing returns to a clear state. At this time, the operation button 31 is shaped like a circular arc with the flat plate part 31a convexing inside the ink ribbon cassette body 13 as shown in FIG. The shape is set so that ME does not return to its original state. Furthermore, a flat plate portion 31 having an arc shape with
It is assumed that the force P of a is smaller than the pressing force Q of the pressing spring 29. Note that the shape of the operation button 31 is merely an example, and various modifications may be made without departing from the above gist.

As described above, according to this embodiment, by using the operation button 31, the position of the pressing spring 29 can be confirmed, and furthermore, the risk of pressing the suppressing spring 29 too much can be eliminated.

Effects of the Invention As described above, the present invention increases the pressure contact force between the ink transfer roller and the ink impregnated roller to restore the print to a clear state after long-term use of the ink ribbon device.
An operation button is provided as a means for center-over of the suppression spring, which makes it possible to check the state of center-over of the suppression spring, and also eliminates the risk of the ink ribbon device becoming defective due to pushing the suppression spring too much. Therefore, it is possible to provide a highly reliable ink ribbon device, which has great practical effects.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a conventional ink ribbon device, FIG. 2 is an exploded perspective view of a main part of FIG. 1, FIG. 3 is a plan view of an ink ribbon device in an embodiment of the present invention, and FIG. FIG. 6 (2L) is an exploded perspective view of the main part of FIG. 3, and FIG. 6 (2L) is a plan view of the main part of FIG. 12... Ink ribbon, 26... Ink transfer roller, 28... Ink impregnation roller, 2
9. River... Push IE spring, 13... Ink ribbon cassette body, 3°... Hole, 31...
Operation button. Name of agent: lf Toshio Nakao, Physician, and one other person Figure 1 Figure 4 q

Claims (2)

[Claims] (1) When the ink contained in the ink impregnated roller is transferred to the ink ribbon by pressure contact between the ink transfer roller and the ink impregnated lawn, the ink impregnation roller and the ink transfer roller are brought into pressure contact using the center over of the spring member. An ink ribbon device comprising: a reversal suppressing member that changes force; and an operation button that causes the reversing pressing member to center over in a hole provided in a housing. (2) The ink ribbon device according to claim 1, which has an old force that resists the center over of the operation button id inversion suppressing part and is buried inside when the ink impregnation roller is pressed.