JPS595086A - Cleaning mechanism for type drum - Google Patents

Abstract

PURPOSE:To automatically clean a type drum interlockedly with reversing of an ink ribbon and maintain a drum surface to be always clean, by connecting an arm of a type drum cleaning brush to a reversing lever for reversing the ink ribbon. CONSTITUTION:When the ink ribbon 2 placed along a ribbon guide 21 provided at the outside periphery of the type drum 1 is gradually wound around a roll 23 on one side so that an end of the ribbon 2 is approached, a reversing bar 24 is let out, whereby the reversing lever 25 is pulled up to operate a microswitch 26 for driving a reverse running. Interlockedly with the pulling-up of the bar 25, the brush arm 28 is moved to the side of the drum 1, and the cleaning brush 27 is slidden against the surface of the rotating type drum 1 through a brushing port 30, whereby ribbon dusts and the like adhered to the drum 1 are scraped off and are received into a dust receiver 31.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a type drum cleaning mechanism in a flying drum type line printer.

(b) Prior Art and Problems A flying drum type line printer is a type of print output device used in information processing devices and the like. As shown in FIG. 1, the line printer rotates a type drum 1, on which a large number of type characters are embedded on the outer peripheral surface, at a predetermined speed.
Printing is performed by selectively hitting the printing characters on the printing drum 1 with a printing hammer 4 in response to a printing timing signal from behind the ink ribbon 2 and the recording paper 3 which are arranged opposite to the printing drum 1. .

By the way, in the line printer as mentioned above, as the printing operation progresses, ribbon waste, which becomes fluffy due to the friction between the ink ribbon 2 and the type drum 1, adheres to the type drum 1, which deteriorates the print quality. There was an inconvenience. Conventionally, the ribbon debris adhering to the type drum 1 of the line printer has been periodically removed by hand, but cleaning and setting up the type drum 1 requires a considerable amount of time and effort. This had the disadvantage of reducing the printer's operating rate.

(C) Object of the Invention In order to eliminate the above-mentioned conventional drawbacks, the present invention provides a novel type drum cleaning mechanism that can automatically clean the type drum in conjunction with the reversal drive of the ink ribbon. The purpose is to provide

(d) @Akira's configuration and the above object is, according to the present invention, a printing device that rotates a type drum, drives a printing hammer in response to a timing signal, and prints on recording paper via an ink ribbon.
The ink ribbon has a reversing lever drive unit which reverses the running direction of the ribbon by being engaged with a reversing control bar provided at the end of the ink ribbon, and a brush arm having a type drum cleaning brush is connected to the reversing lever. This is achieved by providing a type drum cleaning mechanism characterized in that the brush is brought into sliding contact with the type drum surface in conjunction with the driving of the reversing lever.

(e) Embodiments of the Invention Preferred embodiments of the invention will now be described in detail with reference to the drawings.

2 and 8 are a sectional view of a main part and a top view with four parts cut away, showing an embodiment of a type drum cleaning mechanism according to the present invention. In the following drawings, parts that are equivalent to those in FIG. 1 are given the same reference numerals. In both of these figures, the ink ribbon 2 disposed along the ribbon guide 21 disposed around the outer periphery of the type drum l is sequentially wound at a constant speed from one ribbon roll 22 to the other ribbon roll 28, and then ends. When the ink ribbon 2 is near, the reversing bar 24 attached to the terminal end of the ink ribbon 2 is fed out, and the reversing lever 25 is pulled up by the reversing bar 24 and the micro switch 26 is pulled up.
The ink ribbon 2 is actuated to release the unillustrated drive clutch for the ribbon row/L/2B and connect the unillustrated drive clutch for the one ribbon roll 22 to cause the ink ribbon 2 to travel in reverse. . Therefore, in the present invention, a brush arm 28 equipped with a cleaning brush 27 having a length along the surface of the type drum 1 is attached to the driving portion of the reversing lever 25 using a reversing drive mechanism for the ink ribbon 2. . 8o is a brushing window bored in the ribbon guide 21, and 81 is a debris receiver. Further, the cleaning brush 27 has a fixing screw 29
This makes it possible to adjust the degree of contact with the type drum l.

By providing the cleaning brush 27 in this manner, the brush arm 28 moves toward the type drum in conjunction with the movement in which the reversing lever 26 is pulled up by the reversing bar 24, which is fed out together with the ink ribbon 2 from the ribbon row/L'22. The cleaning brush 27 moves to the l side and the cleaning brush 27 touches the brushing window 8.
0, the ribbon is brought into sliding contact with the surface of the rotating type drum 1, and until the reversing lever 25 operates the microswitch 26, the ribbon debris adhering to the type drum 1 is scraped out and placed in the debris receiver. I can be placed in 31.

When the microswitch 26 is operated to rewind the ink ribbon 2, the reversing lever 25 is returned to its original position and the cleaning brush 27 is separated from the type drum l. That is, since the type drum 1 is automatically cleaned every time the ink ribbon 2 is reversed, the type drum 1 is automatically cleaned.
The surface is always clean (f) Effects of the Invention As is clear from the above explanation, according to the type drum cleaning mechanism according to the present invention, the print drum is automatically cleaned in conjunction with the reversal drive of the ink ribbon. Because you can
The type drum surface is constantly cleaned and good print quality can be maintained.

In addition, the number of man-hours required for cleaning the printing drum can be greatly reduced, and a printing device equipped with such a mechanism has many excellent advantages, such as improved operating efficiency, and is extremely advantageous when applied to this type of impact printer. .

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing a printing mechanism of a general flying drum type line printer, FIGS. 2 and 8 are sectional views showing essential parts of an embodiment of a type drum cleaning mechanism according to the present invention, and FIG. FIG. 3 is a top view with main parts cut away. In the drawing, l is a type drum, 2 is an ink ribbon, 8
21 is a recording paper, 21 is a ribbon guide, 22° lever, 26 is a micro switch, 27 is a cleaning brush, 28 is a brush arm, 80 is a brushing window, and 31 is a debris receiver. Figure 1 Figure 2

Claims (1)

[Claims] In a printing device that rotates a type drum and drives a print hammer in response to a timing signal to print on a recording paper via an ink ribbon, a reversal control bar provided at the end of the ink ribbon engages to rotate the ribbon. It has a reversing lever drive unit that reverses the running direction, a brush arm equipped with a type drum cleaning brush is connected to the reversing lever, and the brush is brought into sliding contact with the type drum surface in conjunction with the driving of the reversing lever. A type drum cleaning mechanism characterized by: