JPH02120077A - Ribbon slack winding preventing mechanism in ribbon cassette - Google Patents

Abstract

PURPOSE:To prevent the slack winding of a ribbon by providing a roller for feeding the ribbon, a guide for guiding the rotation of the roller which is fitted into the guide, and a spring for applying a pressing force against the guide from inside a ribbon cassette. CONSTITUTION:A ribbon 1 is fed to a feed roller 3 through a roller 2. At this time, a spring 5 for applying a slight force is provided between the guide 4 provided with the roller 2 and the inside of a ribbon cassette, whereby the slack in winding the ribbon 1 is prevented by the application of the force in the tensile direction of the ribbon 1. Because the ribbon slack preventive mechanism is mounted before a feed roller 3, the slack in winding the ribbon 1 is prevented, the ribbon is payed out with a constantly stable feed torque, and an unsatisfactory running of the ribbon can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a ribbon cassette, and more particularly to a ribbon winding loosening prevention mechanism.

[Conventional technology]

Conventionally, the ribbon winding loosening prevention mechanism of this type of ribbon cassette was implemented by inserting a sponge in the middle of the ribbon path at the upper left of the ribbon cassette to increase the feeding force of the ribbon and prevent winding loosening (see Figure 3). ).

[Problem to be solved by the invention]

The ribbon winding loosening prevention mechanism of the conventional ribbon cassette described above always maintains a constant tension and does not cause loosening until the ribbon is fed into the sponge. The disadvantage is that the ribbon gets tangled with the idle roller, causing poor running of the ribbon.

[Means to solve the problem]

The ribbon winding loosening prevention mechanism of the ribbon cassette of the present invention is as follows:
It has a roller for smoothly feeding the ribbon, a guide for stabilizing rotation by fitting the roller into it, and a spring for applying a minute force to the guide from inside the ribbon cassette to prevent the ribbon from loosening.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a mechanical diagram of an embodiment of the present invention, and FIG. 2 is an enlarged view of section A in FIG. 1. The ribbon is sent via roller 2 to feed roller 3. At this time, in order to apply force in the direction in which the ribbon is stretched and prevent the ribbon from loosening, a spring 5 is provided to apply a small force between the guide 4 having the roller 2 and the inside of the ribbon cassette.

〔Effect of the invention〕

As explained above, in the present invention, by inserting a ribbon loosening prevention mechanism in front of the feed roller, it is possible to prevent the ribbon from loosening, and to always feed the ribbon with stable feed torque to prevent running defects. effective.

[Brief explanation of the drawing]

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.
FIG. 3, an enlarged view of part A in the figure, is a diagram showing a conventional mechanism. ■・・・Ribbon, 2...Roller, 3...
...Feed roller, 4...Guide, 5.
...Spring, 6...Sponge. Agent: Susumu Uchihara, Patent Attorney, 3rd Closed (0 to B Suburbs, 2nd FFI (Master A)

Claims (1)

[Claims] A ribbon loosening prevention mechanism for a ribbon cassette, which includes a roller for feeding the ribbon, a guide that engages the roller and guides the rotation of the roller, and a spring that applies a pressing force to the guide from inside the ribbon cassette.