JPS61160274A - Ink ribbon cassette - Google Patents

Abstract

PURPOSE:To dispense with the fixation of a knob by a jig and, at the same time, to improve assembling workability, by providing a flange for preventing a cassette knob from falling to a wind-up lever. CONSTITUTION:A cassette knob takes a state receiving load from a wind-up hub 25 and receives force in a direction falling to the opposite side. In order to prevent this falling, the flange 22a for preventing the falling of the cassette knob is provided to a wind-up lever 22. Herein, the wind-up lever 22 is energized to the cassette knob direction by a spring 21 to more certainly perform the prevention of the cassette knob from falling.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an ink ribbon cassette containing an ink ribbon.

(Conventional Example) Conventionally, when installing a cassette knob that fits into a cassette case, it was necessary to use an assembly jig to secure the knob in advance to prevent it from falling over, which was disadvantageous in terms of workability. .

(the purpose) The present invention aims to eliminate the above-mentioned drawbacks.

(Embodiment) As shown in FIG. 1, a printer to which an ink ribbon cassette of the present invention is installed is formed of a control section 1 and a printing mechanism section 2, and the printing mechanism section 2 further includes a platen 3, a printing carriage 5, and the like. and a driving part 6. The printing carriage 5'' has a type wheel 8. A printing hammer 9 and an ink ribbon cassette 7 for supplying ink are attached.

The ink ribbon cassette 7 is shown in FIG.

The cassette is divided into a winding side B that engages with the printing carriage and winds the ink ribbon, and a supply side A that supplies the ink ribbon so as not to interfere with the winding and printing operations. . The example shown in FIG. 2 will be explained from the supply side. Lower case 1
1 and the upper case 27, the ink ribbon 18 is wound around a core 19 that rotates around a rotating post 17 provided in the lower case.

It rotates in the direction of unwinding due to the pulling force from the winding side. At that time, a detent plate 16 attached to the core 19 in order to regulate the amount of unraveling engages with the detent pawl 15 that freely rotates around the detent pawl boss 12 provided on the lower case. The engagement force is generated by the spring 14.

The ink ribbon pulled out through the detent is conveyed to the winding side via a tension spring 20 that takes up the slack when the detent is opened. On the other hand, on the winding side, a ribbon feed dog 24 sandwiched between a winding lip 26 that engages with the winding drive section of the carriage body and a manual winding knob 23 winds the ink ribbon onto a winding hub 25. . At this time, the winding hub 25 is rotatably attached to the winding lever 22, which rotates freely on the lower case using the winding lever boss 2B provided on the lower case 11-A as a fulcrum.

The ribbon feeding dog 24 and the winding lubricant 25 are pressed into contact with each other by a winding lever spring 21.

FIG. 3 shows the relationship between the thousand-turn knob 23 and the winding lever 22.

The procedure for assembling this part is as follows: (1) Lower case 1
1, a cassette knob composed of a winding lip 26, a ribbon feed dog 24, and a manual turning knob 23 is fitted.

(2) Winding hub 25 around which ink ribbon 18 is wound
Attach the winding lever 22 to the winding lever 22.
is attached to the rotating post 17 provided in the lower case 11. (
3) Attach the take-up lever spring 21 to the take-up lever 22. As described above, in the state (3), the cassette knob receives a load from the take-up hub 25, and a force is applied in the direction of falling to the opposite side. In order to prevent this fall, the take-up lever 22 is provided with a collar 22a for preventing the cassette knob from falling.

This collar 22a presses the stepped portion of the winding lip 26 to prevent it from falling down. Here, as mentioned above, the winding lever 22
is biased toward the cassette knob by a spring 21, thereby more reliably preventing the cassette knob from falling.

(Effects) As explained above, by providing the take-up lever with the flange for preventing the cassette knob from falling down, there is an effect that it is not necessary to fix the cassette knob with a jig, and at the same time it is advantageous in terms of ease of assembly.

[Brief explanation of drawings]

Fig. 1 is an external view of an electronic typewriter, which is an example of a printer, Fig. 2 is an internal mechanism diagram of an ink ribbon cassette, which is an embodiment of the present invention, and Fig. 3 is a detailed view of the vicinity of the cassette knob of the ink ribbon cassette. be. 11 is the lower case, 22 is the take-up lever, 22-a is the cassette knob falling prevention collar on the take-up lever, 23 is the manual knob that constitutes the cassette knob, 24 is the ribbon feed dog, and 26 is the take-up lip. 1.25 indicates the take-up hub.

Claims (1)

[Claims] It has a cassette knob that is rotatably fitted into the cassette case, a lever that presses the ribbon winding hub against the hand-cranked knob, and the lever is provided with a collar that prevents the cassette knob from falling. Ink ribbon cassette.