JPS5913991B2 - Wire dot type line printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a wire dot type line that completes one line of dot printing by moving multiple rows of printing wires in the printing line direction and driving them multiple times using a fixed wire drive mechanism. Regarding printers.

1 and 2 are a schematic plan view and a schematic side view 10 showing a conventional wire dot type line printer.

In FIGS. 1 and 2, a plurality of wires and drive mechanisms 1 are fixed to a head bracket 2, and a plurality of printing wires 3, which are driven by the wire drive mechanisms 1 and move back and forth, are attached to a plurality of shuttle bars 4. guide holes 4
15 are inserted into each a. This shuttle bar 4
is driven in the negative direction by an eccentric cam 5 rotated by a drive source (not shown), and then driven in the opposite direction by a return spring 6 to reciprocate. Therefore, each time this shuttle bar 4 moves by a predetermined amount, the wire 20 drives the wire drive mechanism 1 to drive the printing wire 3 and move back and forth, thereby removing a medium such as pressure-sensitive paper placed in front of the shuttle bar 4. 7, equally spaced dots are printed. In this way, one line of dot printing is completed while the shuttle bar 4 reciprocates once25, but since the shuttle bar 4 only swings the relatively lightweight printing wire 3, it is possible to However, at this time, the printing wire 3 is bent as shown in FIG. There is a drawback that the printing force becomes unstable and weak due to resistance from There was a drawback that the printing wire 3 was not transmitted well and the printing wire 3 was subjected to a bending force, resulting in poor printing quality. In order to eliminate the above-mentioned drawbacks, the present invention provides a wire holding link that guides the printing wire straight, one end of which is swingably attached to the head bracket, and the other end is swingably attached to the guide hole of the shuttle bar. By fitting and inserting, the printing wire is driven without bending.It will be described in detail below according to the drawings.FIGS. 3 and 4 are partially cutaway schematic plan views showing one embodiment of the present invention. and in cross-sectional side view, the first
Elements that are the same as those in the figures and FIG. 2 are given the same reference numerals.

In FIGS. 3 and 4, 8 is a printing magnet of the wire drive mechanism 1, 9 is an armature that is attracted and rotated when the printing magnet 8 is excited, and 10 is fixed to the printing wire 3 and is struck by the armature 9. A hammer button 11 for driving the printing wire 3 is configured to guide the printing wire 3 straight through a rear wire guide 11a and a front wire guide 11b, and one end of the hammer button 11, that is, the rear wire guide, is swingably attached to the head bracket 2. The other end, that is, the front wire guide is a wire holding link that is swingably fitted into the guide hole 4b of the shuttle bar 14, and the front wire guide 11b has a spherical outer shape so that it can swing freely.

To explain the operation in the above configuration, first, a drive source (not shown) rotates the eccentric cam 5 to drive the shuttle bar 14 in one direction, and each time the shuttle bar 4 moves by a predetermined amount, the printing magnet of the wire drive mechanism 1 is rotated. 8 is excited to rotate armature 9.

When the shuttle bar 14 is driven, the wire holding link 11 fitted into the guide hole 4b of the shuttle bar 14 swings, and when the armature 9 is rotated, the hammer button 10 is hit and the printing wire 3 is moved. drive At this time, even if the wire holding link 11 swings, the wire holding link 11
Rear wire guide 11a and front wire guide 11
Since the printing wire 3 guided straight by b also swings together with the wire holding link 11, the printing wire 3 does not bend, and therefore, the printing wire 3 can be moved back and forth efficiently. Further, the frictional force that the printing wire 3 receives from the rear wire guide 11a and the front wire guide 11b of the wire holding link 11 is small.
In addition, since the pressure is constant, dots can be printed stably with sufficient printing pressure, resulting in improved printing quality. Next, when the eccentric cam 5 is further rotated, the shuttle bar 4 is moved to the return spring 6.
is driven in the opposite direction and returns to its original position. By the above operation, one line of dot printing is obtained. Note that each time the medium 7 is fed by one line, the same operation as described above can be repeated multiple times to print one line of characters. Note that the present invention is not limited to the above-described embodiment; for example, by arranging a plurality of rows of printing wires 3 in a plurality of stages, one
It can be similarly applied to a wire dot type line printer in which characters for a line are printed, and the wire holding link 11
Of course, it is possible to change the shape of the
Of course, it is possible to implement the same method even if the front wire guide 11b has a cylindrical outer shape.

As described above in detail, according to the present invention, a wire holding link is provided that guides the printing wire straight, one end of which is swingably attached to the head bracket, and the other end is swingably attached to the guide hole of the shuttle bar. By inserting the wire in a movable manner, it drives the printing wire without bending it, allowing the printing wire to move back and forth efficiently, and stably printing with sufficient printing pressure, resulting in improved printing quality. There is.

[Brief explanation of drawings]

1 and 2 are a schematic plan view and a schematic side view showing a conventional wire dot type line printer, and FIGS. 3 and 4 are a partially broken schematic plan view and a cross section showing an embodiment of the present invention. FIG. 1... Wire drive mechanism, 2... Head bracket, 3... Printing wire, 4...
・Shuttle bar 1, 5...Eccentric cam, 6...
...Return spring, 7...Medium, 8...
...Printing magnet, 9... Armature, 10... Hammer button, 11... Wire holding link.

Claims (1)

[Claims] 1. A shuttle bar that has a plurality of guide holes and moves back and forth, a plurality of printing wires corresponding to the guide holes of the shuttle bar, a plurality of wire drive mechanisms that respectively drive the plurality of printing wires, and a plurality of In a wire dot type line printer equipped with a head bracket that fixes a wire drive mechanism, a wire holding link is provided that has a rear wire guide and a front wire guide at both ends that guide the printing wire straight, and the rear wire guide is attached to the head. A wire dot type line printer characterized in that it is swingably attached to a bracket and a front wire guide is swingably fitted into a guide hole of a shuttle bar.