JPS634799B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a type wheel for a printing device.

As shown in FIGS. 1 and 2, in the conventional type wheel 21, a positioning hole 23 is formed in a type wheel 21 having an annular type portion 22 around the periphery. The type wheel 21 is attached to the shaft 12 so that the protrusion 25 of the positioning bracket 24 fixed to the positioning bracket 24 is fitted into the type wheel 21, and the metal detector 13 detects the metal reference position tab 26 provided on the positioning bracket 24, and the rotation is detected. Upon receiving the counting clock output from the position detector 14,
A control device configured with a known circuit controls the servo motor 11 by counting from a reference position detection position to a specified position, thereby rotating the type wheel 21 and placing the specified type portion 22 at the printing position. It is becoming more and more popular. 15
is the mounting bracket.

However, when attaching the type wheel 21 to the shaft 12, the hole 23 must be aligned and fitted with the protrusion 25, making the installation work cumbersome. However, there have been various drawbacks such as damage to the type wheel 21 and erroneous printing.

An object of the present invention is to eliminate the drawbacks of the above-mentioned conventional type wheel, and to provide a type wheel in which a reference position detecting section for indicating a reference position is directly provided on the type wheel, thereby allowing the type wheel to be attached to a printing device at any angle. That is.

The present invention will be described with reference to embodiments shown in the drawings.

The type wheel 1 in the printing device of the present invention shown in FIGS. 3 and 4 includes a central disk portion 7 having a center hole 6, and a metal reference position detecting portion 3 on the mounting surface side thereof.
and a first engaging member 4 having annular teeth having an integral multiple of the resolution of the servo motor 11, and a second engaging member 5 similar to the first engaging member 4 that engages with the servo motor 11. It is attached to the shaft 12 of 11.
That is, the first engaging member 4 has annular teeth having an integral multiple of the resolution of the second engaging member 5, which is a rotating body that engages with the first engaging member 4 to apply rotational force to the type wheel 1. Become. 2 in the figure is the printed part,
The other metal detector 13, rotational position detector 14 and mounting bracket 15 are the same as those of the conventional ones.

In such a printing device, when the type wheel 1 is attached by fitting the shaft 12 into the center hole 6 at an arbitrary angle, the first engaging member 4 and the second engaging member 5 engage with each other, thereby causing the type Wheel 1 is servo motor 1
Since it is adapted to the decomposition point of 1, the servo motor 11
The metal detector 13 detects the reference position detector 3, receives the output from the rotational position detector 14, and is configured with a known circuit. The controlled controller controls the servo motor 11 to bring the designated type portion 2 to the printing position.

Here, as shown in FIGS. 3 and 4, the teeth of the first engaging member 4 and the teeth of the second engaging member 5 each have an inclined surface, and the inclined surfaces are brought into contact with each other. They are starting to fit together. For this reason,
The type wheel 1 can be engaged very smoothly when attached.

In the above embodiment, the reference position detection section 3 is made of metal, but it may be replaced with one that reflects light, and the metal detector 13 may be replaced with a reflective optical detector. 4 and 5 do not need to be as shown in the drawings, but may be of any type as long as the type wheel 1 can be adapted to the disassembly point of the servo motor 11 when the type wheel 1 is attached to the shaft 12; It goes without saying that various changes and modifications to the above embodiments are possible.

Since this invention is configured as described above, the type wheel can be attached to the rotating body that applies rotational force to the type wheel at any angle, and in this case, the engaging portion provided on the type wheel and the rotating body are engaged. Together,
Since the type wheel is adapted to the point of separation of the rotating body, the type is brought into exact printing position. Therefore, the present invention has excellent effects such as the ability to replace the type wheel extremely easily without the type being displaced from the predetermined printing position. It also has the advantage that it can be easily applied by changing the respective engaging parts of the type wheel and printer.

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams of the conventional type, FIG. 3 is a schematic front view showing an embodiment of the present invention, and FIG. 4 is a schematic perspective view of the type wheel shown in FIG. 3. 1, 21...Print wheel, 2, 22...Print portion, 3,26...Reference position detection section, 4, 5...
First and second engaging members, 11... Servo motor, 12
...Axis, 13...Metal detector, 14...Rotational position detector.

Claims (1)

[Claims] 1 A type wheel used in a printing device and provided with type in a ring shape, which includes a central disk portion, a center hole provided at the center of the center disk portion, and a type wheel arranged in a ring shape outside the center hole. an engaging portion consisting of a plurality of teeth; and a reference position detecting portion provided outside the engaging portion to indicate the reference position of the type wheel; A sloped surface for leveling is provided, and the engaging portion has annular teeth having an integral multiple of the resolution of the rotating body for engaging with the engaging portion and applying rotational force to the type wheel. Features a type wheel.