JPH0558399B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is a printer that is mounted on a carriage that reciprocates in parallel with a platen,
The present invention relates to an ink ribbon cassette in which a contact friction member is provided on the running path of the ink ribbon to provide back tension to the ink ribbon in order to stabilize the running performance of the ink ribbon as it runs in accordance with printing.

(Prior Art) In a conventional ink ribbon cassette of this kind, for example, a felt or the like is attached to a plate spring as a contact friction member, and the felt or the like is brought into contact with the ink ribbon by the elasticity of the plate spring, so that the ink ribbon is Back tension was given.

(Problem to be Solved by the Invention) By the way, when a contact friction member is brought into contact with an ink ribbon, static electricity is generated between the ink ribbon and the contact friction member as the ink ribbon runs, and the ink ribbon on the contact friction member is damaged. Ink scum and dust adhere to the contact surface of the ink ribbon, and the ink scum stains the printing surface of the ink ribbon and increases the back tension of the ink ribbon. When the back tension of the ink ribbon increases, the feed of the ink ribbon is impaired and the ink ribbon and paper rub together with only a portion of the ink ribbon in contact with the paper, resulting in paper stains and decreased print density. This has resulted in problems such as a so-called sticking phenomenon or breakage of the ink ribbon. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an ink ribbon cassette that allows static electricity to easily escape, reduces the adhesion of ink scum, etc., suppresses an increase in the coefficient of friction, and prevents an increase in back tension of the ink ribbon.

[Means to solve the problem]

In order to achieve the above object, the ink ribbon cassette of the present invention is provided with a contact friction member that applies back tension to the ink ribbon on the traveling path of the ink ribbon, and which contacts the ink coated surface of the ink ribbon. The invention is characterized in that a contact friction member such as felt is provided with a slit parallel to the running direction of the ink ribbon.

(Function) By providing a slit parallel to the running direction of the ink ribbon in the contact friction member such as felt that contacts the ink-applied surface of the ink ribbon, static electricity generated between the ink ribbon and the contact friction member is discharged in the air at the slit. This makes it easier to escape,
Therefore, the adhesion of ink scum, etc. is reduced, and even if some adhesion occurs, it is not discharged to the slit and accumulated, so information on the coefficient of friction is suppressed and an increase in back tension of the ink ribbon is prevented. be done.

(Example) Examples will be described with reference to the drawings.

First, as shown in FIG. 1, a delivery spool 2 and a take-up spool 3 are placed side by side in a cassette case 1. The ink ribbon 4 wound around the delivery spool 2 is guided by a guide roller 5 placed at a predetermined position, and reaches the take-up spool 3 while being exposed to a recess 6 on the outer surface of the side wall through which the thermal printing head of the carriage is inserted. ing. At a predetermined position on the running path of the ink ribbon 4 before it contacts the printing head, insert the base end hook 7 into the cassette case 1.
A leaf spring 9 is engaged with a boss portion 8 protruding from the bottom surface of the
Contact friction member 1 made of felt attached to the tip of
0 is attached to the ink ribbon 4 by the elasticity of the leaf spring 9.
The ink ribbon 4 along with the guide roller 5
The required back tension is applied to the ink ribbon 4 by pinching the ink ribbon. And this contact friction member 1
As shown in FIG. 2, the ink ribbon 4 is provided with several slits 11 parallel to the running direction of the ink ribbon 4.

(Effects of the Invention) The present invention is as described above, and by providing a contact friction member such as felt that contacts the ink-applied surface of the ink ribbon with a slit parallel to the running direction of the ink ribbon, the contact friction member and the ink Static electricity generated by the friction of the ribbon is discharged in the air at the slit, making it easier to escape.
The adhesion of ink scum, etc. to the contact friction member is reduced, and even if some adhesion occurs, it is not discharged to the slit and accumulated, so the increase in the friction coefficient of the contact friction member is suppressed, and the back tension of the ink ribbon is reduced. This has the effect of eliminating problems such as stains on the printed surface of the ink ribbon, the occurrence of sticking phenomena, and bending of the ink ribbon.

[Brief explanation of drawings]

FIG. 1 is a plan view of the interior, and FIG. 2 is an enlarged perspective view of the contact friction member. 1... Cassette case, 2... Delivery spool,
3... Take-up spool, 4... Ink ribbon, 5...
... Guide roller, 9 ... Leaf spring, 10 ... Contact friction member, 11 ... Slit.

Claims (1)

[Claims] 1. In an ink ribbon cassette in which a contact friction member that applies back tension to the ink ribbon is disposed on the ink ribbon running path, the contact friction member such as felt, which contacts the ink application surface of the ink ribbon, is connected to the ink ribbon running direction. An ink ribbon cassette characterized by having parallel slits.