JP2831040B2 - Ink ribbon cassette - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink ribbon cassette used for a wire dot printer, for example.

[Prior art]

Ink ribbon cassettes are frequently used in wire dot printers and the like because of their low printing cost and easy replacement. FIG. 1 shows an overall view of the ink ribbon cassette. In this ink ribbon cassette, a long ink ribbon 2 is stored in a case 20 in which a ribbon storage section 22, a ribbon delivery path 23, and a ribbon receiving path 24 are integrated.
The end portion of the ink ribbon 2 is endless, and most of the ink ribbon 2 is accommodated in a folded state in a ribbon accommodating portion 22, and a part of the ink ribbon 2 passes through a ribbon delivery passage 23 and a ribbon receiving passage 24 and passes through a case 20. Has made a round inside. A printing portion 25 exposed to the outside is provided between the ribbon sending passage 23 and the leading end of the ribbon receiving passage 24. A feed mechanism 3 for moving the ink ribbon 2 is disposed on the ribbon receiving passage 24 side of the ribbon storage section 22. FIG. 2 is an enlarged view of the feed mechanism 3. As shown in the figure, the main part of the feed mechanism 3 is composed of a driving roll 5 and a driven roll 6. The driving roll 5 has an annular roll drum 5b and 5c on a rotating shaft 5a, and the driven roll 6 has an annular roll drum 6b on a rotating shaft 6a.
・ 6c are fitted together. The drive roll 5 is supported by a case 20 and a lid 21 and connected to a rotary drive source (not shown). The driven roll 6 has a U-shaped support member 9.
The supporting member 9 is loosely fitted in the groove 26 of the case 20 and the lid 21. Driven roll 6
Is pressed toward the drive roll 5 by a leaf spring 11 on the back surface of the support member 9, and sandwiches the ink ribbon 2 together with the drive roll 5. On the side of the ribbon storage section 22 between the roll cylinders 5b and 5c and between the roll cylinders 6b and 6c, rod-shaped separators 12 and 13 are provided, respectively.
Is provided. This ink ribbon cassette operates as follows.
When the drive roll 5 rotates in the direction of the arrow, the ribbon 2 is pulled out of the ribbon storage section 22, and the ribbon delivery path 23,
The print unit 25 and the ribbon receiving passage 24 make a round in the case 20 in this order, and are sent to the ribbon storage unit 22. The ribbon 2 sent to the ribbon storage section 22 bends according to the direction of the preceding ribbon 2, changes its direction when it touches the separator 12 or 13, and is folded in a zigzag manner.

[Problems to be solved by the invention]

Although the ink ribbon cassette is convenient as described above, the materials of the driving roll 5 and the driven roll 6 have some disadvantages. Roll drums 5b, 5c of the driving roll 5 and the driven roll 6
For 6c, NBR (butadiene acrylonitrile rubber) or sponge-like urethane is used. But NB
The roll cylinder made of R is susceptible to temperature, and in a low-temperature environment, the elasticity is reduced and the ribbon feeding becomes unstable, or the oil resistance is poor, and the oil component in the ink may swell or distort. On the other hand, sponge-like urethane is soft and cannot achieve dimensional accuracy. Since there are relatively large bubbles inside, they are easily distorted by a load, and there is a problem in driving stability.
Then, a compressed body of a sponge-like material was considered. The roll body using the compressed body of sponge-like urethane is dense and has excellent dimensional stability, and does not generate distortion due to load. However, in order to manufacture a roll cylinder, it is necessary to compress a low-density urethane foam into a flat plate to obtain a dense material, punch it, and then grind it to improve roundness. And the material cost is high. SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide an ink ribbon cassette which is easy to manufacture and has high reliability.

[Means for Solving the Problems]

An ink ribbon cassette of the present invention for achieving the above object will be described with reference to the drawings corresponding to the embodiments. As shown in FIG. 1 and FIG. 2, the ink ribbon cassette of the present invention
And a case 20 in which the ribbon receiving passage 24 is integrated,
The endless ink ribbon 2 that is mostly stored in the ribbon storage portion 22 in a folded state, a part of which passes through the inside of the case 20 through the ribbon delivery passage 23 and the ribbon reception passage 24, and the ink is stored in the ribbon storage portion 22. This is an ink ribbon cassette provided with a feeding mechanism 3 for holding and feeding the ribbon 2. The feed mechanism 3 includes a driving roll 5 and a driven roll 6 connected to a driving source.
Roll cylinders 5b, 5c, 6b
6c is formed of a foam of a composition comprising chlorosulfonated polyethylene. The composition containing chlorosulfonated polyethylene is obtained by adding, for example, dioctyl phthalate (DOP) or dibutyl sebacate (DBS)
And a plasticizer such as In order to produce the roll cylinders 5b, 5c, 6b and 6c, for example, a composition containing chlorosulfonated polyethylene is continuously foamed while being extruded into a cylindrical shape. When the obtained cylindrical molded product is cut at a fixed length, the roll cylinders 5b, 5c, 6b, and 6c are obtained.

【Example】

Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is a plan view of an embodiment of an ink ribbon cassette to which the present invention is applied. This ink ribbon cassette
Other than the driving roll 5 and the driven roll 6 of the feed mechanism 3, the configuration is the same as that of the above-described ink ribbon cassette. The outer shapes of the drive roll 5 and the follower roll 6 are the same as those described above, but the roll drums 5b, 5c, 6b, and 6c are provided with chlorosulfonated polyethylene (Showa Denko DuPont Co., Ltd.).
Extruded sponge manufactured by Hypalon. The extruded sponge is obtained by continuously foaming a composition containing chlorosulfonated polyethylene to which a blowing agent has been added while extruding the composition into a cylindrical shape using an extruder. If the molded product is cut to a certain length, the roll cylinder 5b ・ 5c ・ 6b ・ 6c
Is obtained. When the roll cylinders 5b and 5c are fitted on the rotating shaft 5a and the roll cylinders 6b and 6c are fitted on the rotating shaft 6a, the driving roll 5 and the driven roll 6 are completed. This ink ribbon cassette operates as follows.
When the drive roll 5 rotates in the direction of the arrow, the driven roll 6
The ribbon 2 narrowed by (1) and (2) is pulled out from the ribbon storage section 22, and travels around the inside of the case 20 in the order of the ribbon delivery path 23, the printing section 25, and the ribbon receiving path 24, and is sent to the ribbon storage section 22. The ribbon 2 sent to the ribbon storage section 22 bends according to the direction of the preceding ribbon 2, and
Touching 13 changes the direction and folds in a zigzag path. The roll cylinders 5b, 5c, 6b, and 6c of this cassette can be easily formed by simply cutting a continuously foamed composition while extruding a composition containing chlorosulfonated polyethylene into a cylindrical shape. Is simplified. The roll cylinders 5b, 5c, 6b, and 6c have a small degree of temperature dependence and have appropriate elasticity even in a low-temperature environment, and are not distorted by load.
Constant dimensions are maintained. In addition, chlorosulfonated polyethylene has excellent chemical resistance and does not swell with the oil component in the ink. Therefore, it is possible to make the ink ribbon run reliably. The ink ribbon cassette shown in FIG. 3 is a modification of the feed mechanism 3 of the embodiment described with reference to FIG. 1 and FIG.
The drive roll 5 and the driven roll 6 are formed as a single wheel. The roll cylinders 5b and 6b are made of the same material as in the above-described embodiment. In the ink ribbon cassette, separators 12 and 13 facing the peripheral edges of the roll cylinders 5b and 6b are arranged on the side of the ribbon storage section 22 of the driving roll 5 and the driven roll 6. Separator
The case 12 is supported by a case 20, and its end face is provided with two projections 12a and 12b crossing the outer circumference of the roll drum 5b. Protrusion
12a and 12b are close to the upper surface and the lower surface of the drive roll 5 with a slight gap, and the interval between the protrusions 12a and 12b is smaller than the width of the ink ribbon 2. The separator 13 is formed integrally with the support member 9, and the two projections 13a and 13b are close to the upper surface and the lower surface of the roll cylinder 6b with a slight gap. The protrusions 12a, 12b, 13a, and 13b prevent the ink ribbon 2 from being caught between the driving roll 5 or the driven roll 6 and the separators 12 and 13. This ink ribbon cassette operates similarly to the cassette described above.

Function and Effect of the Invention

As described in detail above, the ink ribbon cassette of the present invention uses the composition containing chlorosulfonated polyethylene for the roll cylinder of the driving roll and the driven roll. Since the roll cylinder can be easily obtained by simply cutting a cylindrical molded product that is continuously foamed while being extruded, the production of the cassette is simplified, and the production cost is reduced. In addition, since the roll cylinder has excellent chemical resistance and dimensional accuracy, and has appropriate elasticity, the running reliability of the ink ribbon is high.

[Brief description of the drawings]

FIG. 1 is an overall view of an ink ribbon cassette to which the present invention is applied, FIG. 2 is a partially sectional perspective view showing a feed mechanism thereof, and FIG.
The figure is a partial sectional perspective view showing a feed mechanism of another embodiment. 2 ... Ink ribbon 3 ... Feed mechanism 5 ... Driving roll 6 ... Driving roll 5a / 6a ... Rotating shaft 5b / 5c / 6b / 6c ... Roll cylinder 9 ... Support member, 11 ... Plate Spring 12/13 Separator 12a / 12b / 13a / 13b Projection 20 Case / 21 Lid 22 / Ribbon storage unit / 23 Ribbon delivery path 24 / Ribbon receiving path 25 / Printing section , 26 ... groove

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hajime Nishimura 3-1-1 Higashi-Ikebukuro, Toshima-ku, Tokyo Dynick Co., Ltd. Tokyo Head Office (56) References JP-A-62-134764 (JP, A) JP-A-62-134764 JP-A-1-95087 (JP, A) JP-A-1-127858 (JP, A) JP-A-61-243809 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B41J 32 / 00-32/02 B41J 33/16-33/28

Claims (1)

(57) [Claims] 1. A case in which a ribbon storage section, a ribbon delivery path, and a ribbon reception path are integrated, and a large part of the case is stored in the ribbon storage section in a folded state, and a part is passed through the ribbon delivery path and the ribbon reception path. An endless ink ribbon that loops around the inside of the case, and an ink ribbon cassette provided with a feed mechanism that nips and feeds the ink ribbon to the ribbon storage section, wherein the feed mechanism includes a drive roll and a driven roll connected to a drive source, An ink ribbon cassette, wherein a roll cylinder constituting at least one of a driving roll and a driven roll is formed of a foam of a composition containing chlorosulfonated polyethylene.