JPS6295231A - Printing head - Google Patents

Abstract

PURPOSE:To make the positioning of a printing wire easy, by positioning the position of the printing wire by the contour by the printing unit in which a printing hammer itself is assembled and the contour of the printing unit adjacent to this printing unit. CONSTITUTION:A permanent magnet 1 is pinched by yokes 2 and 3, a coil spool 6 is inserted along the yoke 5 corresponding to a printing hammer 4 and the coil 7 in which the current for releasing the printing hammer 4 flows in wound around the spool 6. The printing wire 8 printing a dot is attached onto the free end side of the printing hammer 4 and the other end thereof is positioned by the contour of the printing hammer itself and the contour of the printing hammer adjacent thereto and fixed to the yoke 3 with a screw 10. Because the printing wire is thu positioned by the contour of the printing hammer itself and the adjacent printing hammer, or otherwise by a side yoke and an adjacent side yoke, a positioning pin can be omitted, the number of parts becoming less and the damage failure of the positioning pin can be removed.

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a printing method for a dot matrix line printer in which a plurality of printing units are assembled which use strain energy accumulated in a printing hammer bent by a permanent magnet or an electromagnet as printing energy. Regarding the head.

Prior Art A conventional print head of this type is composed of a plurality of print units having the same structure, as shown in FIG.

In FIG. 3, a permanent magnet 1 is sandwiched between yokes 2 and 3, and a spool 6 is inserted into the yoke 5 corresponding to the printing hammer 4, around which a current is applied to release the printing hammer 4. A coil 7 is wound around which a current flows.

The printing hammer 4 is a kind of cantilever leaf spring, and a printing wire 8 for printing dots is attached to the free end side of the leaf spring. The position of the printing wire 8 is determined by a positioning pin 9 embedded in the yoke 3 and a positioning hole of the printing hammer 4 located at a position associated with the printing wire 8, and is fixed to the yoke 3 with a screw 10. ing.

Normally, the printing hammer 4 is moved to the third position by the attractive force of the permanent magnet 1.
As shown in Figure (b), it is bent and adsorbed to the yoke 5. By applying current to the coil 7 during printing to cancel the magnetic flux of the permanent magnet 1, the printing hammer 4 is released from the yoke surface, and the strain energy accumulated in the printing hammer 4 itself is converted into kinetic energy. The printer moves and prints.

In this conventional print head, the print wire is positioned using the positioning pin 9 attached to the yoke, which increases the number of parts in the print head and prevents the positioning pin 9 from being damaged when the print hammer is removed. be. In addition, it is difficult to adhesively fix the positioning pin 9 to the yoke with high precision, and even if the method of drilling a hole on the yoke with a jig polar and press-fitting the positioning pin in order to embed the positioning pin in the yoke with high precision is used, the cost is high. become.

OBJECTS OF THE INVENTION Accordingly, it is an object of the present invention to provide a print head for a dot matrix line printer in which positioning of the print wire can be easily performed.

Structure of the Invention According to the present invention, there is provided a print head for a dot matrix line printer in which a plurality of printing units are assembled, each of which uses, as printing energy, strain energy accumulated in a printing hammer bent by the attractive force of a magnet. , for a dot matrix line printer, characterized in that the position of a printing wire provided on a printing hammer is determined based on the outer shape of a printing unit in which the printing hammer itself is incorporated and the outer shape of a printing unit adjacent to this printing unit. A print head is obtained.

153 Next, the present invention will be described in more detail with reference to the drawings showing embodiments of the present invention.

Referring to FIG. 1, in the first embodiment of the present invention, a permanent magnet 1 is sandwiched between yokes 2 and 3, and a coil spool 6 is inserted into a yoke 5 corresponding to a printing hammer 4. A coil 7 is wound around the print hammer 4 to supply a current for releasing the print hammer 4. A printing wire 8 for printing dots is attached to the free end side of the printing hammer 4, and the other end is fixed to the yoke 3 with a screw 10, positioned by the outer shape of the printing hammer itself and the outer shape of an adjacent printing hammer.

Referring to FIG. 2, in a second embodiment of the invention, instead of using the contour of the printing hammer for positioning, the contour of the side yoke 11 joined to the printing hammer and the contour of the adjacent side yoke are used for positioning. Position the printing bin with and.

As described in the detailed description of the invention, the present invention positions the printing wire by the outer shape of the printing hammer itself and the neighboring printing hammer, or by the side yoke and the adjacent side yoke, so the positioning pin is eliminated. This reduces the number of parts and eliminates accidents involving damage to positioning pins. Therefore, a highly reliable print head for a dot matrix line printer can be obtained.

[Brief explanation of drawings]

FIGS. 1(a) and (b) are a front view and a side view of a first embodiment of the present invention, FIG. 2 is a front view of a second embodiment of the present invention, and FIGS. 3(a) and ( 1)) is a front view and a side sectional view of a conventional print head. Explanation of symbols of main parts 1... Permanent magnet 2.3.5... Yoke 4... Printing hammer 7... Coil 8...・Printing wire 11...Side yoke

Claims (3)

[Claims] (1) A print head for a dot matrix line printer in which a plurality of printing units are assembled that use strain energy accumulated in a printing hammer bent by the attraction force of a magnet as printing energy, and the printing head is provided in the printing hammer. A print head for a dot matrix line printer, characterized in that the position of the printed printing wire is determined based on the outer shape of a printing unit in which the printing hammer itself is incorporated and the outer shape of a printing unit adjacent to this printing unit. (2) The print head according to claim 1, wherein the outer shape of the print unit is the outer shape of a print hammer constituting the print unit. (3) The print head according to claim 1, wherein the outer shape of the print unit is the outer shape of a side yoke that constitutes the print unit.