JPS5833828B2 - Ink ribbon feed mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ink ribbon feed mechanism in which an ink ribbon cartridge containing an ink ribbon is detachably attached to a ribbon feed roller and a pressure roller.

In order to simplify the explanation, the dot line printer shown in FIGS. 1a and 1 will be described below.

A dot line printer has many dot printing elements arranged in parallel in the row direction mounted on a shuttle bar, and drives the dot printing elements while swinging the shuttle bar in the row direction to print dots on printing paper one line at a time. Each time printing is completed, the printing paper is fed in the column direction to print one line of characters.

The ink ribbon used in this dot line printer is usually a relatively narrow endless ink ribbon, which is folded regularly and stored in a ribbon cartridge.

However, when replacing the ribbon cartridge in the conventional ink ribbon feed mechanism, the ink ribbon gets stuck between the ribbon feed roller that drives the ink ribbon and the pressure roller, so it is necessary to remove the ribbon cartridge. Thereafter, it is necessary to remove the ink ribbon by separating the pressure roller from the ribbon feed roller, resulting in poor operability.

Therefore, the present invention eliminates the above-mentioned drawbacks and will be explained below using examples.

Figure 1a> and Figure 1 are a plan view and a side view of a dot line printer equipped with an embodiment of the ink ribbon feed mechanism according to the present invention, and Figure 2 is a drive mechanism for the ribbon feed roller in Figure 1. Cross-sectional side view showing Figure 3a
FIG. 3 is a partially detailed plan view and side view showing an embodiment of the ink ribbon feed mechanism according to the present invention.

In the figure, reference numeral 1 denotes a motor used as a drive source for swinging a shuttleper 4, which will be described later, and also as a drive source for feeding an ink ribbon.
a rotating shaft, 1b is a wheel fixed to this rotating shaft 1a,
1C is a belt that transmits the rotation of this wheel 1b, 2a
2b is an eccentric cam connected to the shaft 2c of this flywheel 2a, 2d is a pulley fixed to this shaft 2c, and 28 is a transmission of the rotation of this y-IJ 2a. 3 is a driven pulley driven by the belt 2e, 4 is a shuttleper oscillated by the eccentric cam 2b, 5 is a dot printing element mounted on the shuttleper 4, and 6 is a printing paper (not shown). As shown in FIG. 2, a sheet feeder 7 that feeds sheets in a direction perpendicular to the swinging direction of the shuttleper 4 has the driven pulley 3 rotatably attached to a lower frame 8, and is driven via a bearing 7a. A pulley bracket supports the shaft 9 obliquely at a predetermined angle, a driven pin 10 is fixed to the drive shaft 9, and a driven pin 11 is fixed to the driven pulley 3 and restrained in the rotational direction with respect to the driven pin 10. is a drive pin supported slidably in the vertical direction, 12 is a sliding bearing fixed to a ribbon feed roller 14, which will be described later, and 13 is bearing 1.
The upper frame 3a prevents the drive shaft 9 from falling downward and supports it obliquely at a predetermined angle, and is inclined at a predetermined angle with respect to the lower frame 8.

14 is a ribbon feed roller that is connected to the drive shaft 9 via a one-way clutch 15 and whose outer peripheral surface is covered with a high-friction material such as rubber; 16 is an ink ribbon as shown in FIG. 3; 1T is this ink ribbon. 16 is a ribbon cartridge that folds and stores the ink ribbon 16, and 19 is a ribbon car. groove,
20 is a post that fits into this oblique groove 19, and 21 is a shaft 21a.
It has a rotating arm 21b button and 21e with a rotating axis of
A pressure roller 17 and a post 20 are attached to one rotating arm 21b, and an arm lever 22 has a handle 21d on the other rotating arm 21c.
a spring biasing 1, 23 a ribbon cartridge 1;
Tab formed on the back side of 8, 24 is ribbon cartridge 1
By sliding the ribbon cartridge 18
For example, the upper frame 1 is a tongue piece that engages with a tab 23 formed on the back side of the upper frame 1 to prevent the ribbon cartridge 18 from floating up.
It can be made by pressing 3.

The operation in the above configuration will be explained.

First, the motor 1 is driven to rotate the rotary shaft 1a, and the flywheel 2a is driven through the wheel 1b and belt 1c.

When the eccentric cam 2b and the pulley 2d rotate, the eccentric cam 2b causes the shuttleper 4 to swing in the row direction.

Further, when the driven pulley 3 rotates via the belt 2e, the drive pin 11 attached to the driven pulley 3
The drive shaft 9 is rotated via the drive pin 10.

Each time the shuttleper 4 swings by a predetermined amount, a large number of dot printing elements 5 mounted on the shuttleper 4 are selectively driven to print dots on a printing paper (not shown).

When printing of one dot line is completed, the sheet feeder 6 feeds the printing paper (not shown) by one dot line, and when one character line consisting of multiple dot lines has been printed in this way, the sheet feeder 6 adjusts the line spacing between the character lines. feed and start printing the next character line.

At this time, since the rotational moment of the flywheel 2a is large, the shuttleper 4 swings smoothly.

Further, when the drive shaft 9 is rotated, the ribbon feed roller 14 is rotated via the one-way clutch 15, and the ink ribbon 16 held between it and the pressure roller 17 is driven.

As a result, the ink ribbon 16 is transferred to the ribbon cartridge 1B.
It is fed out from one side and fed in from the other.

At this time, since the ribbon cartridge 18 is mounted on the inclined upper frame 13 as shown in FIG. It can be used effectively across all areas.

i The drive shaft 9 is supported perpendicularly to the upper frame 13, so that the driven pulley 3
It is inclined at a predetermined angle with respect to the rotation axis of.

Therefore, although the driven pin 10 moves up and down with respect to the drive pin 11, it rotates without any trouble because it is restricted only in the direction of rotation.

Next, the motor 1 is stopped and the ribbon cartridge 18 is replaced.

First, the ribbon cartridge 18 is slid away from the ribbon feed roller 14, and the post 20 fitted in the diagonal groove 19 is hooked by the wall 19b of the diagonal groove 19 formed on the back side of the ribbon cartridge 18. The arm lever 21 is rotated clockwise against the biasing force of the spring 22.

When the arm lever 21 rotates sufficiently, the biasing force of the spring 22 switches to bias the arm lever 21 clockwise as shown in FIG. 14.

Also, at the same time or slightly before and after this, ribbon cartridge 1
Since the tab 23 formed on the back surface of the ribbon cartridge 8 is separated from the tongue piece 24 formed on the upper frame 13, etc., the ribbon cartridge 18 can be lifted freely.

Therefore, as shown by the broken line in Fig. 4, 17', 1 B
', 19', 20', 21', 22', so the ribbon cartridge 18 and the ink ribbon 16
can be easily replaced.

Next, a new ribbon cartridge 18 is mounted on the upper frame 13 and slid so as to approach the ribbon feed roller 14.

At this time, the wall 19a of the oblique groove 19 formed on the back surface of the ribbon cartridge 18 moves the post 20, and the arm lever 21 is rotated counterclockwise against the biasing force of the spring 22.

When the arm lever 21 rotates sufficiently, the biasing force of the spring 22 is switched to bias the arm lever 21 counterclockwise, so that the pressure roller 17, which is supported by the arm lever 21 and rotates, is pressed against the ribbon feed roller 14. You can leave it as is.

Furthermore, when the ribbon cartridge 18 is slid closer to the ribbon feed roller 14, the tab 23
is fitted into the tongue piece 24, so that the ribbon cartridge 1
8 will not come off and come off.

In this way, the arm lever 21 can be rotated simply by attaching and detaching the ribbon cartridge 18, and the pressure roller 17 can be pressed against or separated from the ribbon feed roller 14, resulting in good operability.

In the above-mentioned embodiment, if a part of the wall 19b of the diagonal groove 19 is missing, the post 20 can be moved in and out from this missing part, increasing the operability.
If the width of the ink ribbon 9 is made larger than the outer diameter of the post 20, the arm lever 21 can be rotated a little even after the ribbon cartridge 18 is loaded, which is convenient for correcting the disorder of the ink ribbon 16.

Further, since the drive shaft 9 and the ribbon feed roller 14 are connected via a one-way clutch 15, after loading the ribbon cartridge 18, a knob 25 fixed to the ribbon feed roller 14 is rotated to take up the slack of the ink ribbon 16. Even if the ribbon feed roller 14 is rotated in this manner, the drive shaft 9 is not rotated.

Therefore, the knob 25 can be rotated with a small force,
The ink ribbon 16 can be easily driven manually.

Furthermore, if there is at least one drive pin 11, the drive shaft 9 can be rotated in one direction via the driven pin 10, but by sandwiching the driven pin 10 between two drive pins, play is eliminated and the motor The ink ribbon 16 can be driven in response to the rotation of the ink ribbon 16 quickly.

As described in detail above, according to the present invention, the pressure roller can be pressed against or separated from the ribbon feed roller simply by attaching and detaching the ribbon cartridge.
This has the effect of improving operability.

[Brief explanation of the drawing]

1a and 1 are a plan view and a side view of a dot line printer equipped with an embodiment of the ink ribbon feed mechanism according to the present invention, and FIG. A cross-sectional side view showing the drive mechanism, FIG. FIG. 3 is a partially detailed plan view of FIG. 1... Motor, 1a... Rotating shaft, 1b... Wheel, 1c... Belt, 2a... Flywheel, 2
b... Eccentric cam, 2c... Shaft, 2d... Pulley,
2e...Belt, 3...Driven pulley, 4...
Shuttle bar, 5... Dot printing element, 6... Sheet feeder, 7... Pulley bracket, 8... Lower frame, 9... Drive shaft, 10... Driven pin, 11... Drive pin, 12...Sliding bearing, 13...Upper frame, 14...Ribbon feed roller, 15...One-way clutch, 16...Ink ribbon, 17...Pressure roller, 18...・Ribbon cartridge, 19... diagonal groove, 19a and 19
b...Slanted wall, 20...Post, 21...Arm lever, 22...Spring, 23...Tab, 2
4... tongue piece, 25... whelk.

Claims (1)

[Claims] 1. A ribbon feed roller, a rotatably supported arm lever, a pressure roller that is attached to one end of the arm lever and comes into contact with the ribbon feed roller when the arm lever rotates, and the ribbon feed roller and the pressure roller. In an ink ribbon feed mechanism, the ink ribbon cartridge is provided with an ink ribbon cartridge that is removably attached to and stores an ink ribbon. By providing a post at the other end of the arm lever, when the ribbon cartridge is moved for attachment or detachment, the post slides on the wall of the oblique groove, rotates the arm lever, and brings the pressure roller into contact with or against the ribbon feed roller. An ink ribbon feed mechanism characterized by being opened.