JPH04182174A - Ink coating roller - Google Patents

Abstract

PURPOSE:To ensure the positional accuracy of a type and an ink roller body in the axial direction of said roller body to prevent the coating insufficiency and color mixture of ink as a result by providing grooves holding the large diameter parts of the ink roller body to the cover supporting an ink roller shaft. CONSTITUTION:An ink roller body 1 is constituted of material quality such as rubber having many minute voids and supported on an ink roller shaft 2 so as to be movable in the axial direction. A cover 3 supports the ink roller shaft 2 and the grooves 3a of the cover 3 hold the large diameter parts 1a of the ink roller body 1 to position the ink roller body 1 in the axial direction. The ink rollers 1 has such a shape that the large diameter parts 1a and small diameters 1b are alternately provided in parallel and the large diameter parts 1a come into contact with types 5a but the small diameter parts 1b do not come into contact with types 5b. Therefore, the ink infiltrated in the ink roller body 1 is only applied to the types 5a and not applied to the types 5b.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ink application roller for applying ink to type, etc. of a type printer.

[Prior Art] Conventionally, this type of ink application roller and printer using the same have been known as shown in Japanese Patent Laid-Open No. 60-141579, and more specifically, as shown in FIG. 2 of this specification. . In this type of device, in FIG. 2, type 5a,
5b and the large diameter portion 1a of the ink roller body in the axial direction, the printing type 5a and the large diameter portion 1a are surely in contact, while the printing type 5b and the large diameter portion 1a are never in contact with each other. This is a necessary condition to prevent insufficient ink application or ink color mixing.

[Problems to be Solved by the Invention] However, in the above-mentioned prior art, although the positional relationship between the shaft 6 of the type drum 4 and the ink roller shaft 8 can be ensured with precision through the perforation member 7, the ink roller shaft 8 and the ink roller body 1, and if slippage occurs in the axial direction, the result is the printing type 5a.

5b and the large diameter portion La of the ink roller body 1 will be out of alignment in the axial direction. Even if there is no slippage between the ink roller shaft 8 and the ink roller body 1, the same result can occur if the accuracy of step machining of the ink roller body 1 is poor or if dimensional changes occur in the ink roller body 1 over time. becomes.

Therefore, the contact between the printed characters 5a and the large diameter portion 1a is incomplete, or the printed characters 5b and the large diameter portion 1a come into contact with each other, resulting in insufficient ink application or color mixing of the inks, which is a very serious drawback. But how.

The present invention has been made to solve these drawbacks, and aims to ensure the axial positional accuracy between the type and the ink roller body, thereby preventing insufficient ink application and color mixing of the inks. purpose.

[Means for Solving the Problems] The ink applying roller of the present invention includes an ink roller body having a plurality of fine pores and a shape in which large diameter parts and small diameter parts are arranged alternately in parallel, and the ink roller. The ink roller body is characterized in that it comprises an ink roller shaft that penetrates and supports the ink roller body, and a cover that pivotally supports the ink roller shaft, and that the cover is provided with a groove that holds the large diameter portion of the ink roller body.

[Operation] According to the above configuration of the present invention, the axial positional accuracy of the large diameter portion of the ink roller body is determined by the positional accuracy of the groove of the cover.

[Example] FIG. 1 is a sectional view of a printer using the ink application roller of the present invention. Reference numeral 1 denotes an ink roller body, which is made of a material such as rubber having a plurality of fine pores, and is impregnated with ink. Reference numeral 2 denotes an ink roller shaft, which supports the ink roller body 1 through it. Here, the ink roller body 1 is supported so as to be movable in the axial direction with respect to the ink roller shaft 2. 3 is a cover, and the ink roller shaft 2
At the same time, the grooves 3a sandwich the large diameter portion 1a of the ink roller body 1 and position the ink roller body 1 in the axial direction. 4 is a type drum, on the outer periphery there are type characters 5a,
5b is installed. The ink roller body l has a shape in which large diameter portions 1a and J1 diameter portions 1b are alternately arranged in parallel,
The large diameter portion 1a is in pressure contact with the type 5a, and the type 5b and the small diameter portion 1b are not in contact with each other. Therefore, the ink impregnated into the ink roller body 1 is applied only to the type characters 5a and not to the type characters 5b. JP-A-60-14157
As shown in Fig. 9, another ink roller body is provided in which the positions of the large diameter part and the small diameter part are reversed, and each ink roller body is impregnated with ink of a different color. Different colors of ink can be applied alternately every other time, making a two-color printer possible. 6 is a type drum shaft, and 7 is a perpendicular member. The type drum 4 comes into contact with the perpendicular member 7 via the type drum shaft 6, and the cover 3
By abutting against the contact member 7, the axial positional relationship between the type drum 4 and the cover 3 is secured. Therefore, even if there is a slight deviation in the step machining accuracy of the ink roller body 1, or even if the dimensions of the ink roller body change over time, the positional accuracy of the groove 3a of the cover 3 can be maintained. For example, the positional accuracy in the axial direction between the large diameter portion 1a of the ink roller body 1 and the type 5 can be ensured.

[Effects of the Invention] As described above, when the ink application roller of the present invention is used in a printer, the axial positional accuracy between the large diameter portion of the ink roller body and the type can be ensured. ,
This can solve fatal printer problems such as insufficient ink application and ink color mixing.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of a printer using an ink application roller according to the present invention, and FIG. 2 is a sectional view of a printer using a conventional ink application roller. 1...Ink roller body 2...Ink roller shaft 3...Cover 4...Type drum 5...More than type Applicant Seiko Epson Co., Ltd. Agent Patent attorney Kizobe Suzuki and 1 other person

Claims (1)

[Claims] An ink roller body having a plurality of fine pores and a shape in which large diameter parts and small diameter parts are arranged in parallel alternately, an ink roller shaft that penetrates and supports the ink roller body, and a shaft that supports the ink roller shaft. 1. An ink application roller comprising: a cover, the cover being provided with a groove for sandwiching a large diameter portion of the ink roller body.