JPH0646705Y2 - Ink ribbon ink supply structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is characterized in that a resin transfer roll is interposed between an ink ribbon formed by impregnating a liquid ink at room temperature and an ink impregnation supply member, The present invention relates to an ink replenishing structure for an ink ribbon, which is configured to transfer the ink supplied from the impregnation supply body to the transfer roll to the ink ribbon and replenish the ink to the ink ribbon.

[Conventional technology]

In this type of ink replenishing structure of the ink ribbon, the ink from the ink impregnation supply body adheres to the surface of the transfer roll more than necessary, excessive ink is transferred to the ink ribbon, and abnormal bleeding occurs in the printed image. In addition to being easy, the ink impregnated in the ink impregnation supply body is wasted, and printing cannot be performed at a predetermined density in an early stage.

In particular, even when the running of the ink ribbon is stopped, the ink impregnation supply body and the transfer roll are elastically pressed against each other. A large amount of ink accumulates due to the wetting force of the ink in the ink-impregnated supply body between the body and the transfer roll portion that is in contact with the body, and when the running of the ink ribbon resumes, the ink that has accumulated on the transfer roll portion Therefore, the above-mentioned defects are prominently apt to occur due to abnormal bleeding of the printed image.

Therefore, in order to solve this drawback, a transfer roll is conventionally made of a resin material in which a general resin such as an acrylic resin, polystyrene, or polypropylene is blended with a resin having a high ink repellency such as a fluorine resin or a silicone resin. It has been proposed to mold and impart ink repellency to the surface of the transfer roll to repel ink, thereby suppressing excessive supply of ink from the ink-impregnated supply body to the transfer roll (for example, Japanese Utility Model Laid-Open No. 58-42066). (See the official gazette).

[Problems to be solved by the device]

However, according to the above-mentioned conventional technique, a transfer roll is molded with a resin material in which a resin having high ink repellency is blended, and ink repellency is imparted to the surface of the transfer roll. As the amount of ink repellent is increased by increasing the amount, there is a problem that resin molding becomes difficult or impossible due to such a blend of resins having high ink repellency. Since there is a limit to this, measures such as adjusting the ink supply amount by combining a smooth roll and a knurled roll are taken.

As is clear from this, when imparting ink repellency to the transfer roll surface by molding the transfer roll with a resin material in which a resin having high ink repellency is blended, the transfer roll is transferred from the ink impregnation supply body. Although it is possible to suppress the excessive supply of ink to the transfer roll, it is unavoidable that a certain amount of excess ink is supplied to the transfer roll depending on the strength of the ink repellency that can be applied, and abnormal bleeding occurs in the printed image. It is difficult to control the ink supply amount from the ink-impregnated supply body such as the above-mentioned knurling roll in order to make it possible to print at a predetermined density for a long time without wasting ink. It is necessary to separately provide a means for doing so, and there is a drawback that the ink supply structure becomes complicated.

The present invention has been made in view of the above circumstances, and by devising the structure of the ink repellent film formed on the surface of the transfer roll, abnormal bleeding is less likely to occur in the printed image, and moreover, it is possible to maintain a predetermined value for a long period of time. An object of the present invention is to make it possible to configure an ink supply structure of an ink ribbon that can be printed with a density with a simple structure.

[Means for Solving the Problems] A characteristic configuration of the present invention for achieving the above object is an ink replenishing structure of an ink ribbon described above, in which a predetermined amount or more of ink adheres to the surface of the transfer roll. In order to prevent such a phenomenon, an ink-repellent film made of a resin surface modifier is formed on the surface of the transfer roll, and such a configuration has the following effects.

[Action]

Rather than molding a transfer roll with a resin material having a high ink repellency blended to impart ink repellency to the surface of the transfer roll, a resin surface modifier is applied to the surface of a resin transfer roll that has been molded in advance. Since the ink-repellent film formed by means of the above is provided to impart the ink-repellency to the transfer roll surface, the ink-repellency having a desired strength can be imparted to the transfer roll surface without giving special consideration to moldability.

[Effect of device]

Therefore, it is possible to adjust the ink supply amount without separately providing a device for adjusting the ink supply amount from the ink impregnated supply member as in the related art, and it is difficult for abnormal bleeding to occur in the printed image, and for a long period of time. The ink replenishing structure of the ink ribbon that can print at a predetermined density can be configured with a simple structure.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

(C) is a pair of left and right ribbon guide arms (1A), (1A).
Body case (1) made of synthetic resin integrally formed with B)
And a lid (2) made of synthetic resin for closing the upper opening of the main body case (1), which is an ink suspended between the pair of arms (1A), (1B). The ribbon (R) can be printed by an impact dot head (not shown).

The ink ribbon (R) is made of cloth, non-woven fabric, or a resin film having a resin film on the surface of which a porous resin layer for ink impregnation is formed, and is impregnated with a liquid ink at room temperature.

Reference numeral (3) is a U-shaped partition wall that forms an elongated rectangular ribbon storage space (4) in the left and right in the main body case (1).

(5) and (6) are feed rolls for driving a pair of large and small ink ribbons provided on the inlet (3a) side of the U-shaped partition wall (3). These feed rolls (5),
The outer peripheral surface of (6) is roughened in a gear shape so as to form a large number of triangular protrusions parallel to the rotation axis on the outer peripheral surface.

(7) is a backup member that receives the rotating shaft (5a) of the large diameter feed roll (5), and (8)
Is the rotary shaft (6a) of the feed roll (6) on the small diameter side.
This is a support arm that is swingable around the axis of the pin (9) that supports. A compression coil spring (between the support arm (8) and an ink storage case (10) described later that elastically presses the small-diameter side feed roll (6) toward the large-diameter side feed roll (5). 11) is interposed.

The feed roll (6) on the small diameter side is arranged between the ink ribbon (R) and the ink impregnation supply body (A) provided in the main body case (1), and the ink impregnation supply body ( Ink from (A) is added to the ink ribbon (R)
And a transfer roll for replenishing the ink ribbon (R) with ink. The transfer roll (6) is made of a plastic material or the like, and has an ink non-impregnation property so that the ink received from the ink impregnation supply body (A) does not penetrate into the transfer roll (6).

Further, in order to prevent the predetermined amount or more of ink from adhering to the surface of the transfer roll (6), the transfer roll (6)
Even if the running state of the ink ribbon (R) is continued for a long time, the transfer roll (6) has a surface property of ink repellent to repel a predetermined amount of ink or more.
Excess ink is prevented from adhering to the surface of the. Specifically, by immersing the transfer roll (6) in a solution of a fluorine-based resin surface modifier (trade name Surflon SR-100 of Asahi Glass Co., Ltd.), as shown in FIG. By forming a thin ink-repellent film (S) on the surface of the transfer roll (6), ink-repellency is imparted to the surface thereof.

The ink-impregnated supply body (A) is an ink storage case (10) having a rectangular shape elongated to the left and right, provided between the partition wall (3) and the side wall (1a) of the main body case (1), and the ink. First porous member (14) filled in the storage case (10)
And a second porous member (15) inserted between the one end face (14a) of the first porous member (14) and the side wall (1a) of the ink storage case (10) facing the one end face (14a). It consists of

The first porous member (14) is made of a non-woven fabric that can be impregnated with ink, a fiber bundle, a sponge, or the like.
The porous member (15) is made of felt, glass wool bundle, or the like that can be impregnated with ink.

One end side of the second porous member (15) is extended to the outside of the case through an ink delivery port (10A) formed in the ink storage case (10), and the transfer roll ( It is bent in a V shape so as to come into contact with 6).

(16) is a compression tool capable of adjusting the compression of the first porous member (14) in the ink storage case (10) toward the second porous member (15). The compression tool (16) includes a pressing plate (16) slidably provided in the ink storage case (10).
a) and a side wall (10c) of the ink storage case (10), which is rotatably attached to the pressing plate (16a).
And a screw member (16b) screwed to the.

Then, by rotating the screw member (16b) with a driver or the like through the through hole (1d) formed in the side wall (1c) of the main body case (1), the pressing plate (16a).
Is slid to the side of the second porous member (15), the first porous member (14) is compressed, and the ink impregnated in the first porous member (14) is replenished to the second porous member (15). There is.

(17) is a leaf spring that applies back tension to the ink ribbon (R).

[Another embodiment]

The ink impregnation supply body (A) may be composed of an ink roll which is rotated by being in contact with the transfer roll (6).

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the structure of the accompanying drawings by the entry.

[Brief description of drawings]

1 and 2 show an embodiment of an ink replenishing structure for an ink ribbon according to the present invention. FIG. 1 is a sectional view of a transfer roll, and FIG. 2 is a sectional view of an entire ink ribbon cartridge. (S) ... Film, (6) ... Transfer roll, (A) ... Ink impregnation supply body, (R) ... Ink ribbon.

Continuation of the front page (56) Reference JP-A-60-44384 (JP, A) JP-A-61-114852 (JP, A) JP-A-59-46236 (JP, A) JP-A-61-10534 (JP , A) Actual opening 58-42066 (JP, U) Actual opening 57-128456 (JP, U) Actual opening 56-39265 (JP, U) Actual opening 61-120560 (JP, U)

Claims (2)

[Scope of utility model registration request] 1. A resin transfer roll (6) is interposed between an ink ribbon (R) formed by impregnating a liquid ink at room temperature and an ink impregnation supply body (A), and the ink impregnation supply body ( An ink replenishing structure of an ink ribbon configured to transfer the ink supplied from A) to the transfer roll (6) to the ink ribbon (R) and replenish the ink to the ink ribbon (R). Then, an ink-repellent film (S) made of a resin surface modifier is formed on the surface of the transfer roll (6) in order to prevent a predetermined amount or more of ink from adhering to the surface of the transfer roll (6). The ink replenishment structure of the resulting ink ribbon. 2. The transfer roll (6) is constituted by one of a pair of gear-shaped ribbon drive rolls which mesh with each other through the ink ribbon (R), and the ink. The ink supply structure for an ink ribbon according to claim 1, wherein the ribbon (R) is an endless ink ribbon.