JPH11115291A - Ink ribbon cassette - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the repulsive force of felt, and prevent felt from being liable to separate from a leaf-spring by providing a slit being approximately at right angles with the curved surface of the leaf-spring, on the surface of the felt on the curved surface of the leaf-spring for preventing sagging. SOLUTION: A leaf-spring 11 having an ink ribbon urging curved surface for winding up a used printing ribbon in one direction is adhered with a belt 12 along its curved surface. The felt 12 is given a slit 12a approximately at right angles relative to the curves surface of the leaf-spring 11. During printing operation, an A portion of the felt 12, but a B portion thereof during its standstill, comes in contact with the ink ribbon mainly; however, since a slit 12a is made on the surface of the felt 12, an adhesiveness of the curved leaf-spring 11 of the felt 12 can be maintained steadily in accordance with rigidity and variation of material of the felt, resulting in stable printing operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink ribbon cassette in which a printed ink ribbon is wound in one direction when printing is performed by a printer.

[0002]

2. Description of the Related Art In recent years, an ink ribbon cassette used in a thermal printer used in a word processor or the like has been developed.
As printing speeds of printers have been increased and ribbons have been further diversified, more stable printing operations have been required.

A conventional ink ribbon cassette will be described below. 2 to 4 show a conventional ink ribbon cassette. FIG. 2 shows the overall view, and FIG.
FIG. 3A shows the relationship between the ink ribbon and the leaf spring in the printing operation. FIG. 3A shows the state at rest and FIG. 3B shows the state at the time of printing. FIG. 4 is a detailed view showing a state where the felt is attached to the leaf spring.

In the drawing, reference numeral 1 denotes an ink ribbon, 2 denotes a winding core of an ink ribbon cassette, and 3 denotes an ink ribbon.
Reference numeral 4 denotes a felt bonded to the leaf spring 3, reference numeral 4 denotes a print head of the printer, and reference numeral 6 denotes a guide wall for guiding the ink ribbon.

The operation of the ink ribbon cassette configured as described above will be described below. First, after the ink ribbon 1 of the ink ribbon cassette is printed by the print head 5 of the printer, it is wound up by the take-up core 2. During the printing operation, the ink ribbon 1 is pulled by the take-up of the take-up core 2. Works, the tip of the slack prevention spring 3 moves around the spring fulcrum 7 and moves from the position of FIG. 3A to the position of FIG. 3B. At this time, the ink ribbon 1 is urged so as not to sag. Then, at the same time when the printing operation is completed, the leaf spring 3 presses the ink bond 1 against the guide wall 6 in a direction to remove the slack of the ribbon. Here, the ink ribbon 1 of the leaf spring 3
As shown in FIG. 4, the contact portion between the ink ribbon 1 and the stationary portion is curved because the contact portion between the printing operation and the stationary state is different, and the contact surface with the ink ribbon 1 protects the ink surface and reduces the frictional load due to the contact. The felt 4 is adhered along the curvature of the leaf spring 3. The part A of the felt is in contact mainly with the ink ribbon 1 during the printing operation, and the part B of the felt is stationary during the printing operation.

[0006]

However, in the above-mentioned conventional construction, since the felt is adhered along the curved surface of the leaf spring for preventing the slack, a repulsive force is generated due to the rigidity of the felt and a change in the material. However, there was a problem that it was easily peeled off from the curved surface of the leaf spring.

The present invention solves the above-mentioned conventional problems, and provides an ink ribbon cassette in which the repulsive force of felt against a curved surface of a leaf spring for preventing slack is reduced, and the felt is less likely to be peeled off than the leaf spring. The purpose is to:

[0008]

In order to achieve this object, an ink ribbon cassette according to the present invention is provided with a slit on the surface of a felt which is substantially perpendicular to the curved surface of the leaf spring.

With this configuration, the repulsive force of the felt against the curved surface of the leaf spring can be reduced, and the felt attached to the ink ribbon contact surface can be curved while maintaining the adhesiveness to the leaf spring stably. The shape can be maintained.

[0010]

The invention according to claim 1 of the present invention is directed to an ink ribbon cassette for winding a printed ink ribbon in one direction, a leaf spring having a curved surface for urging the ink ribbon, The felt attached along the curved surface is provided with a slit for stabilizing the adhesiveness with the curved surface, and has an effect that the felt is hardly peeled off from the curved surface of the leaf spring.

An embodiment of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 is a detailed view showing a state in which a felt of an ink ribbon cassette according to an embodiment of the present invention is attached to a leaf spring. Other configurations are the same as in the conventional example. In the figure, 11 is a leaf spring, 12 is felt, 12
a shows the slit made on the felt surface. Slit 1
2a is provided in a direction substantially perpendicular to the curved surface of the leaf spring 11.

The operation of the ink ribbon cassette configured as described above will be described below. Similar to the operation of the conventional example, the portion A of the felt during the printing operation and the portion B of the felt during the stationary operation mainly contact the ink ribbon (not shown), but the slit 12 a is provided on the surface of the felt 12. Therefore, the adhesiveness between the felt and the curved leaf spring can be stably maintained in accordance with the change in the rigidity and the material of the felt.

Further, since the felt is formed as a slit without being divided, the number of steps for bonding does not increase.

Since a plurality of slits are provided in close contact with the curved surface of the leaf spring, it is more effective to provide a plurality of slits. The depth of the slit can be freely changed according to the rigidity of the felt, the degree of curvature of the leaf spring, and the like.

[0015]

As described above, according to the present invention, after printing, the printed ink ribbon is wound in one direction, and is adhered along the curved portion of the plate spring for preventing the slack of the ink ribbon cassette to protect the ribbon ink surface. By providing a slit in the felt for the purpose of (1), it is possible to realize an ink ribbon cassette capable of performing a stable printing operation while maintaining a rigid felt on a curved leaf spring surface.

[Brief description of the drawings]

FIG. 1 is a detailed view showing a state in which a felt of an ink ribbon cassette according to an embodiment of the present invention is attached to a leaf spring.

FIG. 2 is an overall view of a conventional ink ribbon cassette.

FIG. 3 is a diagram illustrating a relationship between an ink ribbon and a leaf spring in a printing operation.

FIG. 4 is a detailed view showing a state in which a conventional felt is attached to a leaf spring.

[Explanation of symbols]

 11 leaf spring 12 felt 12a slit

Claims (1)

[Claims] 1. An ink ribbon cassette for winding a printed ink ribbon in one direction, a leaf spring having a curved surface for urging the ink ribbon, and a felt attached to the curved surface along the curved surface. An ink ribbon cassette provided with a slit for stabilizing adhesiveness with the ink ribbon cassette.