JPS6018347A - Type wheel - Google Patents

Abstract

PURPOSE:To install a type wheel at any angle to a drive means and interchange the wheel easily, by a method wherein reference position detecting unit is installed directly to the type wheel. CONSTITUTION:A type wheel 1 is provided at attaching surface side with a reference position detecting unit 3 of a metal and a first engaging member 4 having annular teeth at integer times to disassembling function of a servo motor 11. A second engaging member 5 is similarly engaging with the first engaging member 4 is mounted to a shaft 12 of the servo motor 11. If the type wheel 1 is mounted at any angle to the shaft 12, the first engaging member 4 and the second engaging member 5 are engaged with each other, and the type wheel 1 is adapted to disassembling point of the servo-motor 11, and each type portion 2 is accurately brought to printing position by driving of the motor 11. A metal detector 13 detects the reference position detecting unit 3, and at receiving output from a rotation position detector 14, a control unit controls the motor 11 and brings the prescribed type portion 2 to the printing position.

Description

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

As shown in Fig. 1.2, this conventional one-weight device has a type wheel 2 which has an annular type portion 22 around it and a positioning hole 23 formed therein, and a servo motor 1 The type wheel 2 is attached to the shaft 12 so that the protrusion 25 of the positioning bracket 24 fixed to the shaft 12 fits with the projection 25 of the positioning bracket 24.
The metal detector 3 detects the metal acid filling skewer position tab 26 provided on the positioning bracket 24, and receives the clock output for counting from the rotational position detector 14. This is a method in which the control device counts from the reference position detection position to the specified position.--By controlling the motor 11, the type wheel 21 rotates and the specified type portion 22 is brought to the printing position. There is. 15 is a 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, which makes the installation work troublesome. When installed, there were various drawbacks such as damage to the type wheel 21 or erroneous printing.

The present invention eliminates the drawbacks of the prior art and provides a type wheel in which a reference position detecting section for detecting a reference position is directly provided on the type wheel so that it can be attached to a printing device at any angle. This is the purpose.

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 has a metal reference position detecting section 3 on its mounting surface side and a servo motor 110 having a first engaging ring-shaped tooth having an integral multiple of the resolution. A similar second retaining member 5 that engages with the first engaging member 4 is attached to the shaft 2 of the servo motor 11. In the figure, reference numeral 2 denotes a type part, and its Shinkin Bank M detector 13, rotational position detector] 4, and bracket 15 are of the conventional type and +i+ type.

In such a printing device, when the type wheel ] is attached to the hl] 2 at an arbitrary angle, the first engaging member 4 and the second retaining member 5 engage, thereby causing the type wheel to be connected to the servo motor. Servo motor suitable for 11 decomposition points
] is driven, the valley printed portion 2 is brought to the printing position accurately, and the metal detector 13 detects the reference position detector 3 and receives the output from the one-rotation position detector 14, and is configured with a known circuit. The controlled control device controls the servo motor 11 to bring the designated character portion 2- to the printing position.

Here, as shown in FIGS. 3 and 4, the first engaging member 4
The teeth of the second engaging member 5 and the teeth of the second engaging member 5 each have an inclined surface, and these inclined surfaces abut each other and mesh with each other. Therefore, the type wheel 1 can be secured 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. The member 4.5 does not need to be as shown in the drawings, but may be of any other 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 mounted on the shaft 12. It goes without saying that various changes and modifications to the above embodiments are possible.

Since the present invention is configured as described above, the type wheel can be attached to the drive member at any angle, and therefore the type wheel can be replaced extremely easily. Furthermore, the present invention also has the advantage that it can be easily applied to ordinary type wheel printers by changing the respective engagement parts of the type wheel and printer.

[Brief explanation of the drawing]

1.2 is an explanatory diagram 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. ], 2]...Print wheel 2, 22...Print portion 3.26...Crystal level gong detection unit 4, 5...1st.
2 engaging member 11... servo motor 12... shaft] 3
...Metal detector 14...Rotation position detector state? Kasumi 4n -2゜

Claims (1)

[Claims] 1. A type wheel used in a printing device having a circular type part Z extending around the periphery, characterized by having a reference position detection part for indicating a reference position in the rotational direction and a plurality of engaging parts.