JPH0578563U - Ink ribbon cassette - Google Patents

Abstract

(57) [Summary] [Object] To provide an ink ribbon cassette capable of preventing an increase in the tension of the ink ribbon when the feed direction and the printing direction of the ink ribbon are opposite to each other and preventing the print wire from being bent or bent. An ink ribbon feeding chamber 2 and an ink ribbon feeding chamber 3 are arranged on both sides of an ink ribbon storage chamber 1, and the ink ribbon 4 exposed from the ink ribbon feeding chamber 2 to the outside and printed is printed. The ink ribbon 4 is guided to the ribbon feeding chamber 3 and moved from the ink ribbon feeding chamber 3 to the ink ribbon storage chamber 1.
Is again returned by the ink ribbon take-up device 5, and the inner wall 6 of the ink ribbon take-up chamber 3 is located at a position before the ink ribbon take-up device 5 in the ink ribbon take-up chamber 3.
The ribbon guide 8 is attached to the tip of the spring member 7 whose base end is fixed to the
And a tension adjusting device 9 for winding the ink ribbon 4 around the ribbon guide portion 8 is installed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an ink ribbon cassette used in a printing device such as a printer.

[0002]

[Prior Art]

 Conventionally, as shown in FIG. 4, an ink ribbon feeding chamber 11 and an ink ribbon feeding chamber 12 are arranged on both sides of the ink ribbon receiving chamber 10, and after the ink ribbon feeding chamber 11 is exposed to the outside and printed. There is an ink ribbon cassette that guides the ink ribbon 13 to the ink ribbon feeding chamber 12 and returns the ink ribbon 13 from the ink ribbon feeding chamber 12 to the ink ribbon storage chamber 10 again by the ink ribbon feeding device 14. ..

When this kind of ink ribbon cassette is used in, for example, a wire dot type printer, if the feed direction of the ink ribbon and the printing direction are the same, the tension applied to the ink ribbon does not increase so much. If the feeding direction and the printing direction of the ink ribbon are opposite, the tension applied to the ink ribbon will increase extremely and the load of the printing wire that digs into the ink ribbon will become excessive, causing a problem of bending or bending. ..

In order to solve this problem, the inner wall of the ink ribbon feeding chamber can be formed of a leaf spring to reduce the tension of the ink ribbon, as disclosed in Japanese Patent Application Laid-Open No. 1-291975. Ink ribbon cassettes made in this way are considered.

[0005]

[Problems to be solved by the device]

 However, if the inner wall of the ink ribbon feeding chamber is formed by a leaf spring as in the above-mentioned known example, the inner wall made of the leaf spring bends when the tension of the ink ribbon increases, so that the ink ribbon is fed from the print head. There was a problem that the running direction of the ink ribbon to the loading chamber was inclined, and a gap was created between the bent inner wall and the bottom surface or lid of the cassette case, and the ink ribbon was caught in the gap.

In view of the above, the present invention, without causing such a problem, can mitigate the increase in the tension of the ink ribbon when the feeding direction of the ink ribbon is opposite to the printing direction, and can prevent the printing wire from being bent or bent. The purpose is to provide a set.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the ink ribbon cassette of the present invention has an ink ribbon feeding chamber 2 and an ink ribbon feeding chamber 3 disposed on both sides of an ink ribbon storage chamber 1 and is exposed to the outside from the ink ribbon feeding chamber 2. The ink ribbon 4 after being printed is guided to the ink ribbon feeding chamber 3, and the ink ribbon feeding device 5 returns the ink ribbon 4 from the ink ribbon feeding chamber 3 to the ink ribbon storage chamber 1 again. At a position in front of the ink ribbon feeding device 5 in the ink ribbon feeding chamber 3, a ribbon guide portion 8 is provided at the tip of a spring member 7 whose base end is fixed to the inner wall 6 of the ink ribbon feeding chamber 3. A tension adjusting device 9 for winding the ink ribbon 4 around the ribbon guide portion 8 is installed.

[0008]

[Action]

 When the tension of the ink ribbon 4 increases, the spring member 7 is bent and the ribbon guide portion 8 is displaced, so that the tension of the ink ribbon 4 in the ink ribbon feeding chamber 3 is relaxed.

[0009]

【Example】

 The embodiment of the present invention shown in FIG. 1 will be described below. First, reference numeral 1 in the drawing denotes an ink ribbon storage chamber, in which an ink ribbon 4 is stored in a folded state. The ink ribbon 4 is an endless ring. An ink ribbon feeding chamber 2 and an ink ribbon feeding chamber 3 are arranged on both left and right sides of the ink ribbon storage chamber 1. An ink ribbon feeding device 5 including an ink ribbon feeding roller 15 and a pressing roller 16 is installed at the boundary between the ink ribbon feeding chamber 3 and the ink ribbon storage chamber 1. Further, the ink ribbon feeding chamber 2 is provided with a tension applying device 19 for pinching the ink ribbon 4 between the leaf spring 17 and the side wall of the case, while the ink ribbon feeding chamber 3 is provided with an ink ribbon feeding chamber. A ribbon guide portion 8 is provided at the tip of a spring member 7 whose base end portion is fixed to the inner wall 6 of 3, and the ribbon guide portion 8 is brought into contact with the ink ribbon 4 to make the traveling path of the ink ribbon 4 into a dogleg shape. The changed tension adjusting device 9 is installed.

The ink ribbon 4 pulled out from the ink ribbon storage chamber 1 passes through the ink ribbon feeding chamber 2 and is exposed to the outside from the front end opening of the ink ribbon, and is printed by the print head 20. After entering the inside from the tip inlet, the ribbon is wound around the ribbon guide portion 8 of the tension adjusting device 9 in the ink ribbon feeding chamber 3, and then folded again by the ink ribbon feeding device 5 into the ink ribbon storage chamber 1. It is rolled up while being played.

When the print head 20 prints and the print wire of the print head 20 bites into the ink ribbon 4, the tension of the ink ribbon 4 in the ink ribbon feeding chamber 3 is increased. Since the spring member 7 of 9 bends and the ribbon guide portion 8 is displaced toward the inner wall 6 side to try to relieve the tension of the ink ribbon 4, on the contrary, the tension of the ink ribbon 4 is prevented from increasing and printing is performed. Excessive load on the wire is avoided.

Incidentally, FIG. 2 shows another embodiment. As shown in FIG. 3, the spring member 7 is made of wire, and the roller 18 is attached to the ribbon guide portion 8 at the tip thereof. It is equipped with a tension adjustment device 9.

[0013]

[Effect of the device]

 The present invention is as described above, and when the feeding direction and the printing direction of the ink ribbon are opposite, the tension of the ink ribbon can be eased when the printing wire bites into the ink ribbon. This has the effect of reducing the load on the wire and preventing it from bending or bending. Further, since the inner wall of the ink ribbon feeding chamber does not bend as in the above-mentioned known example, the running direction of the ink ribbon from the print head to the ink ribbon feeding chamber is not inclined, and the inner wall and the bottom surface or lid of the cassette case are not tilted. Since there is no gap between them, there is no problem such as the ink ribbon being pinched. If the spring member is made of wire as in the above embodiment, the cost can be reduced, and the tension loss can be prevented by attaching a roller to the ribbon guide portion at the tip of the spring member.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is a plan view of another embodiment.

FIG. 3 is a perspective view of a tension adjusting device according to another embodiment.

FIG. 4 is a plan view of a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Ink ribbon storage chamber 2 Ink ribbon feeding chamber 3 Ink ribbon feeding chamber 4 Ink ribbon 5 Ink ribbon feeding device 6 Inner wall 7 Spring member 8 Ribbon guide portion 9 Tension adjusting device 10 Ink ribbon feeding chamber 11 Ink ribbon feeding chamber 12 Ink Ribbon feeding chamber 13 Ink ribbon 14 Ink ribbon feeding device 15 Ink ribbon feeding roller 16 Holding roller 17 Leaf spring 18 Roller 19 Tensioning device 20 Print head

Claims (1)

[Scope of utility model registration request] 1. An ink ribbon feeding chamber 2 and an ink ribbon feeding chamber 3 are provided on both sides of the ink ribbon receiving chamber 1, and the ink ribbon 4 is exposed from the ink ribbon feeding chamber 2 to the outside and printed. The ink ribbon feeding chamber 3, and the ink ribbon feeding device 5 returns the ink ribbon 4 from the ink ribbon feeding chamber 3 to the ink ribbon storage chamber 1 again. At a position before the ribbon feeding device 5, a ribbon guide portion 8 is provided at the tip of a spring member 7 whose base end is fixed to the inner wall 6 of the ink ribbon feeding chamber 3, and the ink ribbon 4 is wound around the ribbon guide portion 8. An ink ribbon cassette having a tension adjusting device 9 installed.