JPH01269584A - Ribbon tension stabilizer - Google Patents

Abstract

PURPOSE:To ensure that the angle of winding of an ink ribbon on a wind slack- preventive spring can be maintained at a constantly fixed value, by providing a roller at an intermediate position between a pay-out spool and the wind slack- preventive spring for exerting a tension on the ribbon. CONSTITUTION:A pay-out spool 1, on which an ink ribbon 2 is wound and to which a central bent part of a substantially V-shaped wind slack-preventive spring 3 is attached, is fitted on a pay-out spool support shaft 5a projected from a casing 5. The ink ribbon 2 is taken up on a take-up spool similarly provided in the casing 5. A roller 6 is fitted over a roller support shaft 5b projected from a bottom surface of the casing 5, the ribbon 2 is brought into contact with an outer peripheral surface of the roller 6, and is sequentially supplied to an ink ribbon winding part 3a bent rectangularly, of the spring 3 for exerting a tension on the ribbon 2. With this construction, the positional relationship between the roller 6 and the ribbon winding part 3a of the spring 3 is substantially unchanged, so that the angle A of winding of the ribbon 2 on the ribbon winding part 3a can be maintained to be constant irrespective of the roll diameter of the ribbon 2, from beginning to end of winding.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a ribbon tension stabilizing device used in printing devices such as typewriters.

2. Description of the Related Art A conventional ribbon cassette, for example, shown in FIG.
The other end applies a tensile force to the ink ribbon 2 to prevent the ink ribbon 2 from becoming loose within the case.
Furthermore, the ink ribbon 2 is pulled out from the supply stall 1 and directly wrapped around the case 4 via the other end 3a of the loosening prevention spring 3.
It is designed to be sent to the drawer port 4a.

However, in such a ribbon cassette, as the winding diameter of the ink ribbon 2 wound around the supply spool 1 becomes smaller, the winding angle around the winding loosening prevention spring 3 increases, and the problem occurs near the end of winding. The problem was that the tension increased and winding became impossible.

The present invention solves these conventional problems.Even if the winding diameter of the ink ribbon changes, the ribbon tension is stabilized so that the winding angle around the winding loosening prevention spring is always constant, eliminating changes in tension. The purpose is to provide equipment.

Means for Solving the Problems In order to achieve the above object, the ribbon tension stabilizing device of the present invention is characterized in that a roller is provided at an intermediate position between the supply spool and the winding loosening prevention spring that applies tension to the ribbon. be.

According to the above structure, the ink ribbon is pulled out from the supply spool and is wound around the other end of the loosening prevention spring through a roller, so that the angle at which the ink ribbon wraps around the winding loosening prevention spring is always kept constant. can be kept.

As a result, it is possible to keep the tension acting on the ink ribbon constant from the start of winding to the end of winding.

EXAMPLE Hereinafter, an example of the present invention will be described based on the drawings. FIG. 1 is a perspective view of a main part of a ribbon tension stabilizing device according to an embodiment of the present invention, and FIG. 2 is a top view of the same.

As shown in FIG. 1, 6 is a case, and the ink ribbon 2 is wound around the supply spool holding shaft Sa protruding from the case 5, and the central bent part of the approximately V-shaped winding loosening prevention spring 3 is attached. A supplied supply spool 1 is inserted. The ink ribbon 2 is also wound up by a take-up spool (not shown) provided inside the case 6. In addition, a row 26 is inserted into the roller holding shaft 6b protruding from the bottom surface of the case 6, and the ink ribbon 2 is brought into contact with the outer peripheral surface of the roller 6, and the winding loosening prevention spring 3 that applies tension to the ink ribbon 2 is bent vertically. The ink ribbon 2 is sequentially supplied to the section 3a.

Next, the operation of this embodiment will be explained.

In FIG. 2, the ink ribbon 2 is wound around the ink ribbon winding portion 3a of the winding loosening prevention spring 3 via this roller 6, and is pulled out from the ink ribbon draw-out opening 51L.

As a result, the ink ribbon winding of the ink ribbon 2 is carried out at part 31.
Since the position of the roller 6 and the ink ribbon winding section 3& is almost unchanged, the winding angle around L can be kept constant regardless of the winding width of the ink ribbon 2 from the start of winding to the end of winding.

Effects of the Invention As described above, according to the ribbon tension stabilizing device of the present invention, the angle at which the ink ribbon is wound around the anti-loosening spring becomes constant through the use of the roller, so that the ink ribbon is It is possible to keep the tension acting on the ink ribbon constant, and it is possible to achieve the excellent effect that the ink ribbon can be run stably.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a main part of a ribbon tension stabilizing device according to an embodiment of the present invention, FIG. 2 is a plan view showing the state of the tension, and FIG. 3 is a perspective view of a conventional example. 1... Supply spool, 2... Ink ribbon, 3... Winding loosening prevention spring, 3a...
...Ink ribbon winding is part, 5...Case,
5a... Supply spool, holding shaft, 6b...
...Roller holding shaft, 6c...Ink ribbon drawer opening, 6...Roller. 1---G] 2-Fool 2--Isofurigono 3-71 Looseness 1 Stop spring 3α--Isikuriposo Shoulder-Monk a threat 5--Case 6--Fula 5cm--Infuri j: “Rada 1 Hatashiro 5--Roller C 1I 3 Fig.

Claims (1)

[Claims] A ribbon cassette case consisting of a supply spool with an ink ribbon wound thereon, a take-up spool for winding the ink ribbon, and a winding loosening prevention spring, the supply spool being rotatable only during winding by the winding loosening prevention spring. comprising a roller holding shaft protruding from the bottom of the case, and a roller inserted into the roller holding shaft and rotatably held, the roller abutting the ink ribbon;
A ribbon tension stabilizing device, characterized in that the ribbon tension stabilizing device is provided at an intermediate position between the supply spool and the winding loosening prevention spring so as to keep the tension applied to the ink ribbon constant.