JPS5919830B2 - Type guard - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing mechanism using a flexible disk-shaped type wheel in which a large number of type bodies are arranged on a ring, and in particular, during printing, the type body is displaced by impact. This relates to a type body guard that is interposed between the type body, the ribbon, and the tape in order to prevent the type, the type support, and the ribbon/tape from coming into direct contact at the interference portion, and to suppress the vibration of the type. be.

The printing mechanism for so-called motor-controlled printers, which is directly connected to a motor to perform type selection operations, uses a disk-type wheel in which a large number of type bodies are arranged around the circumference, supported by a flexible type support. However, in conventional printing mechanisms of this kind aimed at increasing speed, the type that is displaced by impact during printing and the vibration of the type support may come into contact with the ribbon/tape at the interference part, resulting in breakage of the type support. There were disadvantages such as abrasion of the ribbon and tape, and vibration of the type during printing, which adversely affected type selection.

This invention was made in order to eliminate the above-mentioned drawbacks, and by interposing a type card made of a thin plate between the type supported by the type support and the ribbon tape, it is possible to print. To suppress the type vibration that occurs during printing, prevent breakage of the type supporting part or wear of the ribbon/tape, extend the life of the type and ribbon/tape, and improve the reliability of the printing mechanism. The purpose is to

F This invention will be explained below. An example of a disc type wheel used in the present invention is shown in FIG.

In FIGS. 1a and 1b, numeral 1 is a typeface, which is arranged in large numbers on a ring supported by a typeface supporter 2. In FIGS.

Reference numeral 3 denotes an annular connecting portion on which the type body 1 is supported.

4 is a spoke, 5 is a drive motor shaft mounting portion, 6 is a torque pin hole, and T is a drive motor shaft mounting hole.

The above case constitutes a disc type wheel 8 having a lightweight structure.

FIGS. 2A and 2B are a perspective plan view and a side view of a type body guard showing an embodiment of the present invention as seen from the direction of arrow A, in which numeral 9 denotes a separate thin plate portion for separating the ribbon tape and the type body; 10 11 is a vibration suppressing thin plate portion for regulating the vibration of the typeface, and 11 is a support plate for fixing the vibration suppressing thin plate portion 10.

12 connects the support plate 11 to the carriage part (
13 is a fulcrum of a fitting part for opening and closing the support plate 11, and 14 is a space provided so as not to disturb the displacement of the type during printing impact. be.

The typeface guard 15 is thus constructed. FIG. 3 is a front view showing a state in which the type body guard 15 of FIG. 2 is interposed in the gap between the ribbon tape and the disc-shaped type wheel 8.

In FIG. 3, the same reference numerals as in FIGS. 1 and 2 indicate the same parts, 16 is a ribbon tape, and 17 is a ribbon tape when the type body 1 rotates left and right during the type selection operation.
This is an interference portion where the tape 16 and the typeface 1 interfere.

Next, the printing operation and the action of the type body guard will be explained mainly with reference to FIGS. 3 and 4.

First, to explain the printing operation, for type selection 2, the drive motor (not shown) rotates the type 1 to the left or right with respect to the paper surface in FIG. The blow for printing is performed by
The typeface 1 is attached to the front ribbon tape 1 as shown in Figure 4.
6 and collides with the platen 18 to print on the recording paper 19 on the platen 18.

By repeating the above operations, desired printing is performed. At this time, since the type body 1 and the type support portion 2 are located in the space 14, printing can be performed freely without any restrictions. Third, the function of the type guard 15 will be explained. (1) During the printing operation, the type body 1 is rotated by a drive motor (not shown) K, a selection operation is performed, and after the printing impact is applied and the type surface is scraped, that is, in FIG. Vibration occurs in the b direction, causing the ribbon 4 and tape 16
It becomes easier to get caught. In other words, an interference portion 17 is created where the ribbon tape 16 shown in FIG.
6, causing breakage, etc. Therefore, in this invention, the separate thin plate part 9 of the type body guard 15 is interposed between the type body 1 and the ribbon tape 16 to prevent the above-mentioned interference part 17 from occurring, thereby preventing breakage of the type support part 2. , the ribbon tape 16 is prevented from being worn out. (2) During printing impact, vibrations occur in the type body 1 and the type support portion 2.

A smaller vibration is advantageous in terms of type selection, but if this vibration is suppressed more than necessary, the life of the type support 2 will be adversely affected. (3) If the type body 1 and the type body guard 15 come into direct contact with each other during rotation during type selection, the face of the type will wear out and print quality will deteriorate, so it is desirable that they do not come into contact with each other.

Therefore, in this invention, as shown in FIG. 4 of the type body guard 151IC, the height difference 20
, the above contact can be prevented. (4) During the printing operation, the type support part 2 is displaced by printing impact, which causes bending strain, and this bending causes fatigue of the type support part 2.
It is necessary to reduce this bending strain in order to extend the life of the type support portion 2.

In the type body guard 15 of the present invention, in order to make the most of the distortion reduction structure due to the flexibility of the type body 1, there is a space 1 in the printing area.
4 is provided to be large, the life of the type support portion 2 can be extended. Therefore, in this invention, in order to suppress this vibration to an optimal amount, we have determined the optimal position for vibration suppression and the optimal curve shape for absorption of the contact portion of the vibrating body, which were obtained through experiments. Since the vibration suppressing thin plate part 10 designed with the optimum spring constant is provided, the rotation of the circular type wheel 8 causes the vibration suppressing thin plate part 10 to
The vibrations of the vibrating type support portion 2 are immediately suppressed when they come into contact with each other. In this way, the above-mentioned adverse effects due to vibration are eliminated. As explained above, in a printing mechanism using a flexible disc-shaped type wheel, this invention has a type body guard of a predetermined shape interposed in the gap between the type body and the ribbon/tape. Type support and ribbon
There is no part that interferes with the tape, so accidents such as breakage of the type supporting part are eliminated, and there is an advantage that stable and high quality printing can be realized.

[Brief explanation of the drawing]

FIGS. 1A and 1B are a plan view and a side view of a disc type wheel used in the present invention, and FIGS. 2A and 2B are a plane perspective view and an arrow A of a type guard showing an embodiment of the present invention.
3 is a front view of the type body guard shown in Figure 2 interposed between the disc type wheel and the ribbon tape, and Figure 4 is the type body guard shown in Figure 2. FIG. 4 is a schematic side view for explaining the printing operation of the printing mechanism using the printer and the action of the type body guard. In the figure, 1 is a type body, 2 is a type support part, 8 is a disc type wheel, 9 is a separate thin plate part for separating the ribbon/tape and the type body, and 10 is a vibration suppressor that regulates the vibration of the type body. Thin plate part, 11 is a support plate, 14 is a space part, 1
5 is a type guard, 16 is a ribbon tape, 17 is an interference part, and 20 is a step.

Claims (1)

[Claims] 1 Using a flexible disk-shaped type wheel in which a large number of type bodies supported by a type support part are arranged on a ring,
In the printing mechanism, which is rotated in forward and reverse directions by a drive motor, selects the typeface, and performs predetermined printing on a recording paper supported on a platen via a ribbon tape. has a space that does not impede the displacement of the type during printing operation, and has a portion that is separate from the type and comes into contact with the ring, and has a connection between the ribbon tape and the type. A type body guard characterized by having a separate thin plate portion interposed between the type body and a ribbon tape at an interference portion where the type body overlaps.