JPS5928189B2 - Anti-vibration type wheel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a type wheel, particularly a spoke type anti-vibration type wheel provided with anti-vibration plates for fingers.

Type wheels for so-called motor-controlled printers, in which a type wheel is directly connected to a motor to perform type selection operations, can be broadly classified into pallet type and spoke type.

The pallet type has a structure in which a large number of type characters are slidably fitted into a highly rigid support that houses them, and during printing, selected type characters are struck and pushed out by a printing hammer. has been done. Therefore, for all types of type, there are many sliding parts that increase the number of parts and cause wear to perform these operations.

Therefore, there were drawbacks such as low reliability and the need for complicated assembly work, making it difficult to reduce the price. on the other hand,
A conventional spoke-type wheel 1 has several wide spokes 3 extending radially from a boss 2 that receives the rotating shaft of a motor with the center of the rotating shaft as shown in FIG. It has a ring part 4 formed as follows.
The ring 4 is integrally provided with a large number of finger portions 5 extending outward at regular intervals, and 128 characters of all types 6 are formed at the tips of these finger portions 5.

In addition, when there are only a few types of type, fingers may extend radially directly from 1 and 2, but if all 128 types of characters are used in this shape, the moment of inertia will be large. Therefore, in order to reduce the rotational moment of inertia,
A shape as shown in Figure 1 has been devised. However, with these structures, there is no problem at low speeds during type selection operation, but as the speed increases, the vibrations in the rotational direction of the fingers and the vibrations in the direction of the print surface become larger, and the print quality deteriorates accordingly. Therefore, the strain generated at the base of the ring 4 and the finger 5 becomes large, which causes a decrease in fatigue strength. For this reason, some types had a rubber damper ring glued to the fingers of the type wheel to prevent vibrations.
However, the adhesive has the drawback of peeling or twisting of the fingers. In order to eliminate the drawbacks of the conventional art, the present invention includes a spoke part extending radially from a boss part fixed to a rotating shaft of a type selection motor, a ring part integrally connecting tips of the spoke part, and a ring part extending outward from the ring part. A type wheel having a plurality of fingers arranged at equal intervals to form a matrix type at an elongated tip, and a convex edge on the outer periphery of an annular member made of abrasion-resistant and elastic plastic, A stopper having a width corresponding to the finger gap is disposed in the shape of a gear on the convex edge, and a vibration prevention plate provided with a guide in contact with the ring part of the gap between the spokes is provided on the inner peripheral edge, and the spokes of the type wheel are provided with Insert the guide of the anti-vibration plate into the ring part between them, insert the caulking stud provided in the ring part of the type wheel into the hole bored in the anti-vibration plate, and connect the type wheel and anti-vibration plate to the caulking stud. The purpose of this is to prevent the finger from vibrating during printing, to improve fatigue strength without causing strain at the base of the ring, and to shorten the finger even at high speeds. It's to make it unnecessary.

The present invention will be explained based on the drawings.

Figure 2 is a front view of a vibration prevention type wheel according to an embodiment of the present invention, Figure 3 is a temporary vibration prevention type wheel according to the present invention, Figure A is a front view,
The opening diagram shows a plan view, the opening diagram in FIG.

In the figure, 7 is an anti-vibration type wheel with a boss 8 provided with a rotating shaft hole 25 in the center, a plurality of wide spokes 9 extending radially from the boss 8, and the tips of the spokes 9 connected to each other. The ring portion 10 is integrally formed, and the ring portion 10 is integrally provided with a number of fingers 11 extending outward at regular intervals.
A matrix type 12 is formed at the tip.

On the other hand, a hole 10-1 is bored in the ring part 10.
Insert the caulking stud 14 into the vibration prevention plate 1 from the back side.
3 is fixed by a caulking stud 14 provided on the ring part 10 on the center line of the spoke part 9, and the vibration prevention plate 13 has a stopper 15 having a gap width corresponding to the finger gap, which is aligned with the pitch of the finger part 11. . Reference numeral 16 denotes a guide portion that comes into contact with the inside of the ring portion 10.

The anti-vibration plate 13 of the present invention has a cutout in the center, a projecting edge 13-1 is provided on the outer peripheral edge, and a stopper 15 having a width corresponding to the finger gap is attached to the Z finger portion of the projecting edge 13-1. 11
It is set up according to the pitch.

Figure 4 A and Figure 4 show the X-X'M type wheel with the anti-vibration plate 13 attached. An enlarged view of a cross section taken along Y-Y'FfB is shown.

The anti-vibration plate is made of abrasion-resistant and elastic plastic, and the caulking stud is fixed to the type wheel by caulking the tip or using adhesive. The type wheel 7 configured as described above is fixed to the rotating shaft 18 of the type selection motor 17 with a fixture 19 via the boss 8 as shown in FIG. 5, and the printing paper 21 is attached. It is arranged opposite to the platen 21.

22 is a print mark.

To fix the type wheel 7 to the rotating shaft 18, a disk-shaped flange 18-1 is provided on the rotating shaft 18, the rotating shaft hole 25 of the boss 8 is inserted into the rotating shaft 18, and the flange 18-1 allows the boss 8 to be fixed to the rotating shaft 18. The type wheel r is held, and an annular recess 18-2 is provided at the tip of the rotating shaft 18, and the fixture 19 is made of an elastic material such as rubber and has a cap shape, and the inner surface has a recess 18-2.
This is done by providing a convex portion 19-1 that fits with the fitting 19, and fitting the convex portion 19-1 of the fixture 19 into the concave portion 18-2. In addition to these structures, the type wheel 7 attached to the rotary shaft 18 of the type selection motor 17 stands still while the required type 12 faces the printing mark 22 as the motor rotates.

The vibrations generated during rotation and rest are suppressed by a stopper 15 provided on the vibration prevention plate 13. Therefore, before printing, there is no vibration in the 12 printed characters. In other words, the printing operation with zero hammer impact is accurate. Furthermore, during printing operations, there is no need to shorten the length of the finger 11 even at high speeds.

The action of the stopper 15 does not control the deformation in the rotational direction but in the longitudinal direction. Therefore, since the rigidity of the ring portion 10 is increased, the overall vibration with respect to the printing surface is reduced, and the strain generated at the root of the finger 11 with the ring portion 10 hardly changes as a result of the experiment. For these reasons, the strain generated at the base of the finger 11 during the selection operation and the printing operation is caused by stress acting only in the direction of the printing surface, which substantially reduces the strain and prevents the finger from breaking.
As explained above, a vibration prevention plate is provided from the back side of the type wheel, and the deformation force 1j of the fingers during rotation is reduced by the stopper provided on the vibration plate. Furthermore, during operation in the printing direction, the finger length does not change even at high speeds, and since the vibration prevention plate is fixed on the ring, the rigidity of the ring increases and Excessive vibration is reduced. Based on the above-mentioned configuration, the present invention produces significant effects such as high-speed and stable operation, improved fatigue strength of the finger portion, and high print quality.

It goes without saying that the technical means of the present invention can be applied not only to disc-shaped typefaces but also to matrix-shaped typefaces provided on comb-shaped fingers arranged in a straight line.

[Brief explanation of the drawing]

FIG. 1 is a front view of a conventional type wheel, FIG. 2 is a front view of an embodiment of the anti-vibration type wheel of the present invention, and FIG.
The figure shows the anti-vibration plate of the present invention, Figure A is a front view, the front view is a plan view, Figure 4, Figure A is an enlarged sectional view of Figure 2 X-XY, and the front view is an enlarged cross-sectional view of Y-YW. 7 shows a side view of the anti-vibration type wheel of the present invention attached to a selection motor for type. 7: Anti-vibration type wheel; 8: Boss; 9: Spoke; 10:
Ring part, 10-1: Hole, 11: Finger, 12: Matrix type, 13: Vibration prevention plate, 14: Caulking stud, 15
: Stoppa, 16 guide part.

Claims (1)

[Claims] 1. A matrix type is formed in a spoke part extending radially from a boss part fixed to a rotating shaft of a type selection motor, a ring part integrally connecting tips of the spoke part, and a tip extending outward from the ring part. a type wheel provided with a plurality of fingers arranged at equal intervals, and a convex edge on the outer peripheral edge of an annular member made of wear-resistant and elastic plastic, and the convex edge has a width corresponding to the gap between the fingers. A stopper having a shape of a gear is disposed in a gear shape, and a vibration prevention plate is provided with a guide on the inner periphery that contacts the ring portion in the gap between the spokes, and a vibration prevention plate is provided at the link portion between the spoke portions of the type wheel. A guide is inserted, a caulking stud provided on the ring portion of the type wheel is inserted into a hole bored in the vibration prevention plate, and the type wheel and vibration prevention plate are fixed to each other by the caulking stud. Anti-vibration type wheel.