JPS63288769A - Spacing mechanism - Google Patents

Abstract

PURPOSE:To simplify a spacing mechanism for transversely moving a carrier to which a printing head is attached in a serial printer, by enabling a slide screw to be axially moved by fitting the slide screw to a rotary shaft via a radial bearing abutting against the rotary shaft with a slant of a fixed angle to an axial direction. CONSTITUTION:Respectively three pieces of radial bearings on a left side and a right side of a slide screw attached to a carrier 4, i.e. six pieces of radial bearings in total are provided. These radial bearings 2 are positioned at intervals of about 120 degrees to one another to abut on a rotary shaft 3. Further, the radial bearing 2 is positioned by a slant of a comparatively small angle to an axial direction of the shaft 3. Therefore, the slide screw 1 is moved left or right by the rotation of the shaft 3, and the carrier 4 is also moved. A moving speed of the slide screw 1 can be regulated by changing a slant angle of the bearing 2. Then, rollers 4a, 4a provided to the carrier 4 touch a fixed shaft 7 provided to the rear of the carrier 4. Swing of the carrier 4 about the rotary shaft 3 is prevented thereby.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a spacing mechanism for laterally moving a carrier on which a print head is mounted in a serial printer.

[Conventional Technology J Conventionally, the spacing mechanism of serial printers is as follows:
In addition to mechanisms that use ropes or belts, there are mechanisms that rotate a shaft that guides the carrier. In this method of rotating a shaft, conventional shafts include a three-dimensional cam-shaped shaft with a groove 13 with a lead as shown in FIG. 4, and a shaft with a screw 14 as shown in FIG. It was used.

[Problems to be Solved] In the spacing mechanism of the conventional serial printer described above, the groove 13 with the lead as described above is replaced with a three-dimensional cam-shaped one or a screw 1 as a shaft for guiding the carrier.
4 is used, which has the disadvantage of being expensive.

[Means for Solving Problems] The spacing mechanism of the present invention which solves the above-mentioned conventional problems is a spacing mechanism of a serial printer that reciprocates a carrier to which a print head is attached. Equipped with a slide screw that is movably fitted in the axial direction and supports the carrier,
and the slide screw is fitted through at least three radial bearings that contact the rotary shaft at a predetermined angle with respect to the axial direction, and the slide screw moves in the axial direction as the rotary shaft rotates. It is configured so that it can be used.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

1 is a plan view of a spacing mechanism according to an embodiment of the present invention, and FIG. 2 is a side view thereof. In FIG. is slidably fitted onto the rotating shaft 3.

As shown in the figure, a total of six radial bearings 2, three each, are provided on the left and right sides of the slide screw l. The radial bearings 2 are located at an angle of approximately 120 degrees from each other and abut on the rotating shaft 3. Further, the radial bearing 2 is positioned at a relatively small angle with respect to the axial direction of the rotating shaft 3, as shown in FIG. Therefore, as the rotary shaft 3 rotates, the slide screw l moves to the left or right. This slide screw 1
The moving speed of the sub cylinder can be changed by changing the inclination angle of the radial bearing 2.

Further, the rotating shaft 3 is an ordinary cylindrical shaft, and the belt 5
In this embodiment, when the rotary shaft 3 rotates clockwise, the slide screw l moves to the right, and conversely, when it rotates to the left, it moves to the left. Moving.

The carrier 4 also has a thermal transfer head 10 positioned facing the platen 8 and a ribbon force set of the ink ribbon 11).
12 is installed. 9 is a printing paper. moreover,
A fixed shaft 7 is provided at the rear of the carrier 4, and rollers 4a, 4a provided on the carrier 4 are in contact with this fixed shaft 7 from above and below. This prevents the carrier 4 from swinging about the rotating shaft 3.

[Effects of the Invention] As explained above, the present invention includes a slide screw that is movably fitted in the axial direction with respect to the rotating shaft, and the slide screw is tilted at a constant angle with respect to the axial direction with respect to the rotating shaft. By fitting through the abutting radial bearing, the slide screw can move in the axial direction as the rotary shaft rotates, so the rotary shaft can be formed into a three-dimensional cam shape as in the past, or the screw can be Since there is no need to provide such a shaft and an ordinary cylindrical shaft can be used as is, it is possible to provide the shaft at a low cost.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a spacing mechanism according to an embodiment of the present invention, Fig. 2 is a side view of the spacing mechanism of Fig. 1, and Fig. 3 is an inclination angle between the radial bearing of the slide screw and the rotating shaft. 4 is a plan view of a rotary shaft with a conventional groove, and FIG. 5 is a plan view of a rotary shaft with a conventional screw. l Ni-Ride Screw 2 Ni-Rashiru Bearing

Claims (1)

[Claims] A spacing mechanism for a serial printer that reciprocates a carrier with a print head attached thereto, comprising a rotating shaft and a slide screw that is fitted to the rotating shaft so as to be movable in the axial direction and supports the carrier, and the slide screw are fitted through at least three radial bearings that contact the rotating shaft at a predetermined angle with respect to the axial direction, so that the slide screw can move in the axial direction as the rotating shaft rotates. A spacing mechanism characterized by: