JPS6023036B2 - Collection ribbon tension adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a collection ribbon tension adjustment device in a typewriter.

Conventionally, eraser ribbons have been developed to erase erroneously printed characters.

There are two types of erasing ribbons: erasing ribbons that have an adhesive surface that transfers the carbon forming the printed characters, and concealing erasing ribbons that overprint and cover up erroneous characters.
In particular, adhesive eraser ribbons are prone to dust that can adhere to the paper or machine and cause them to malfunction or be damaged if they become loose due to the vibrations of the typewriter or the creep of the bong itself, so they must always be kept taut and kept away from the platen, etc. It is necessary to maintain the interval between In view of this, tension adjustment devices for eraser ribbons, ie, collect ribbons, have been developed, but these devices have the drawbacks of complicated mechanisms and unstable tension effects.

The present invention has been made to eliminate the above-mentioned drawbacks, and its purpose is to provide a tension adjusting device which has an extremely simple and compact mechanism, and whose tension action is always constant and stable. Hereinafter, one embodiment of the tension adjustment diamond pupil of the collection ribbon of the present invention will be described with reference to the drawings.

In FIG. 1, a typewriter side wall 1 is fitted with a platen 2 for performing the required line feeding, as well as a rotatable main shaft 3 and a shift shaft 4. The carrier 5 is supported by the main shaft 3 and is movable along the platen 2. A type element 6 having type characters provided on its circumferential surface is attached to the carrier 5, and is adapted to be struck against the two surfaces of the platen during printing. 7, a ribbon cartridge 7 is provided on the carrier 5, and an adjustment device is installed at a predetermined location via a mounting portion 13.

The collector ribbon 8 is stretched between the left and right guide members 9, and is raised to the printing position when erasing is performed. The collection ribbon 8 is conveyed intermittently by a take-up subroutine 10 every time an erasing operation is performed, and is removed from a supply roll 12. The supply roll 12 is attached to a tension adjustment device 11 as shown in FIG. That is, a disc-shaped support disc 14 is attached to the ribbon cartridge 7, and a rotary disc 16 is rotatably iron-coupled to a support shaft 15 that is milled upward from the center thereof. A spindle 17 is integrally formed on the upper side of the rotating disk 16, and a rotating drum 18 is integrally formed on the lower side. A helical spline 19 is formed on the outer periphery of the spindle 17, and is adapted to mesh with the helical spline 19 provided on the inner surface of the lateral alignment hole of the V-supply roll 12. On the other hand, rotating drum 1
As is clear from FIG. 3, a brake belt 20 is wrapped around the outer peripheral surface of the brake belt 8, and one end of the brake belt 20 is bent to project outward to form a locking piece 21. . Rotating drum 1 with a predetermined friction force between brake belt 2
8, so that the rotary disk 16 and the locking piece 21 can rotate together unless a force greater than the above-mentioned frictional force is applied between them. The rotation of the brake belt 20 is maintained at a constant rotation angle by the stop pieces 21 resting on the two stoppers 22 and 23 bent and protruding from the outer periphery of the support plate 14 to the outside of the rotary drum 18. is limited to. One end of a tension spring 24 is further engaged with the engagement piece 21 of the brake belt 20, while the other end of the tension spring 24 is fixed to the support plate 14. Next, the operation of the apparatus of the above embodiment will be explained.

First, when the erasing key or bar is operated, the collection ribbon 8 stretched between the two guide members 9 is raised to the front of the printing position.

Next, when the character key to be written is hit, the type element 6 is activated and the collection ribbon 8 is pressed onto the characters printed on the paper, and the carbon forming the characters is removed from the collection ribbon 8. Transferred to the paper and erased from the paper. When the erasing operation as described above is completed, the collection ribbon 8 is wound up by the take-up spool 10 with a feed amount corresponding to one character.

The collection ribbon 8 is pulled with a constant tension by a tension spring 24 via the rotary disk 16, the rotary drum 18, and the brake belt 20.
When the first roll is wound, the supply V supply roll 12 is rotated, and the spline 19, spindle 17, and rotating drum 1 are rotated.
8 and the brake belt 20, the locking piece 21 is rotated counterclockwise in FIG. 3 against the tension spring 24. As the winding of the take-up spool 1 progresses, the locking piece 21 comes into contact with the stopper 22, making it impossible for the brake belt 20 to rotate any further. As a result, the rotary disk 16 is rotated with a constant braking force by the brake belt 20, and the collection ribbon 8 is unwound from the collection roll 12. When the winding spool 10 stops winding, the rotary disk 16 is urged to rotate clockwise in FIG. 3 by the tension spring 24 via the brake belt 20.
The collection ribbon 8 is again held under tension with a predetermined tension.

As described above, the present invention uses a tension spring to constantly bias the brake belt in the direction of pulling the ribbon, which frictionally engages with the rotating drum integrated with the rotating disk that holds the collection ribbon supply connecting roll. , a constant tension is always applied to the ribbon, the mechanism is simple and compact, and an inexpensive tension adjustment device can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the main points of a marking machine equipped with an embodiment of the collection ribbon tension adjustment device of the present invention, Fig. 2 is a perspective view of the tension adjustment device, and Fig. 3 is a partially cutaway plan view thereof. It is a diagram. 8...Collection ribbon, 12...Supply roll, 14...
・...Support plate, 16... Rotating disk, 18... Rotating drum, 20... Brake belt, 24... Tension spring. Figure Boat Figure N Whale Figure 3

Claims (1)

[Claims] 1 A rotary disk that holds a collection ribbon supply roll;
a support plate that rotatably supports the rotary disk; a rotating drum integrally formed with the rotary disk; a brake belt surrounding and frictionally engaged with the rotating drum; one end of the brake belt and the support plate; a spring that is tensioned between the brake belt and the spring that tensions the collection ribbon by applying a rotational force in a direction opposite to the collection ribbon feeding direction to the rotary drum via the brake belt; and the brake belt relative to the support plate. and a stopper that limits the rotation of the collector ribbon to a fixed rotation angle.