JPS6150783B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing wheel used in printers and the like.

A printing wheel that has a number of fingers at its tip to support printed characters such as letters and symbols, and by bending the fingers, hits the area where the printed characters are to be printed.For example, in the case of a petal-shaped printing wheel, the printing wheel is used after printing or for selecting the type. When moving the finger, vibration remains. Residual vibration in the finger has an adverse effect on both the quality of printing and the printing operation.

In order to prevent residual vibration, a method has been proposed in which a gum damper is attached to the finger to absorb the vibration, but in this method, when the finger returns to its original position after printing, the type part vibrates toward the hammer side. There was a risk that the type would come into contact with the hammer when the wheel rotated during type selection.

A method has also been proposed in which the fingers are separated from each other and no damper is provided, but in this case, maximum bending stress is generated at the root of the fingers, which is not preferable in terms of durability against bending fatigue.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a printing wheel in which no residual vibration remains and the bending stress acting on the base is alleviated.

The details of the present invention will be explained based on embodiments shown in the drawings.

Substrate 1 as a base in FIGS. 1 and 2
A large number of fingers 2 are attached in a radial manner, and a type portion 3 is attached to the tips of the fingers 2. In the type part 3, type characters 4 are formed in two stages, for example.

A front stopper 5 is provided on the front side of the finger 2, that is, on the side facing the type 4, and the finger 2
Alternatively, a rear stopper 6 is provided on the rear surface of the type portion 3.

Individual fingers 2 as rear stopper 6
Even if you attach individual elastic plates to the finger 2
A common annular elastic plate may be installed for both. Finger 2 and type part 3 by rear stopper 6
Prevents head vibration when the printer returns to its original position after printing. Therefore, the risk of contact with the hammer or ribbon during printing selection is avoided.

As the rear stopper 6, a rigid plate is used, which can be either a plastic plate or a metal plate, and is formed as an annular flat plate. Note that the rear stopper 6 can also be formed as a protrusion whose tip extends along the finger 2 instead of being a different annular flat plate.

The front stopper 5 and rear stopper 6 of the finger 2 are fixed by caulking or the like.

The base plate 1 is not directly fixed to the finger 2, but may be fixed to the rear stopper 6 instead, for example.

By providing the rear stopper that reaches from the base to the type part, the present invention can directly suppress vibrations in the type part where the residual vibration is the strongest in the finger. Further, according to the present invention, a high-speed printing printer can be provided by effectively suppressing finger vibrations that greatly affect printing speed in this type of printer.

[Brief explanation of the drawing]

FIG. 1 is a front view of a printing wheel according to the present invention;
FIG. 2 is a longitudinal sectional view with the lower half omitted. 1... Board, 2... Finger, 3... Printing section, 5... Front stopper, 6... Rear stopper.

Claims (1)

[Scope of Claims] 1. A plurality of flexible fingers extending radially from a base, a printed portion having printed characters such as letters and symbols formed at the tips of the fingers, and a length extending from the base to the printed portion of the fingers. 1. A printing wheel comprising: a rear stopper having a width, the vibration of the finger being effectively suppressed by directly controlling the vibration of the type part with the rear stopper.