JPS62932Y2 - - Google Patents

Description

[Detailed description of the invention] This invention prints a dot matrix pattern on printing paper by attracting and driving a movable piece using the suction action of an electromagnet and activating the printing wire that is in contact with this movable piece. The present invention relates to a wire guide suitable for use in a wire dot printer capable of performing.

In conventional wire dot printers, each print wire that performs printing has various parts such as wire holders attached to the root end, so these must be installed inside the print head at specified intervals. The printed wire must be inserted into the guide hole of each wire guide from the rear towards the guide hole of the tip guide attached to the tip of the head, and it is very difficult even for an expert to smoothly insert it all the way to the tip guide. The insertion work was extremely troublesome, and the guide hole of the tip guide or the tip of the printed wire were often damaged due to failure in the insertion work. Other printed wire attachment methods include using tubes and other tubing as wire guides, but this method requires difficult technology to hold the tube inside the head, and requires more parts and man-hours to hold the wire. However, there has been a strong desire to develop a technique that allows anyone to easily and accurately attach printed wires.

In view of the above-mentioned points, the present invention aims to provide a wire guide for a wire dot printer that is devised so that anyone can easily and quickly attach the print wire to the print head. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

The printing head of a wire dot printer embodying the present invention, generally indicated by the reference numeral 1 in FIG. The members 2, 3, 4 are integrally assembled as shown in the figure by tightening several tightening bolts 5. The housing frame 2 includes a top plate 2a with a large window hole 2b in the center.
On the surface side of a, there are a total of seven (in some cases nine) mounting grooves 2c into which movable pieces 6 formed of silicon iron or the like as shown in FIGS. 1 and 3 can be respectively fitted.
are recessed approximately radially around the window hole 2b. 2d... is a bearing groove connected to the root end of each of these mounting grooves 2c, and a support shaft 6a connected to the root end of the movable piece 6 is rotatably fitted into the groove 2d. Moreover, the inner bottom surface of each bearing groove 2d is slightly inclined as shown by the dotted line in FIG. Therefore, the movable piece 6 fitted into each mounting groove 2c can be moved upwardly and downwardly (see FIG. (left and right)
Further, each of the mounting grooves 2c has a core hole 2e in the bottom into which each core of an electromagnet, which will be described later, is inserted.

Reference numeral 7 designates a leaf spring that presses against the upper surface of the root end of each movable piece 6 that is fitted into the mounting groove 2c, and prevents the movable piece 6 from springing up. As shown, it is formed into a multi-legged shape and is interposed and fixed within the gap 3' between the cover plate 3 and the housing frame 2.

The electromagnet that attracts and operates each of the movable pieces 6 has a cylindrical center yoke 9 fixed at its center, and an iron core in which leg-like iron cores 8a, the same number as the movable pieces 6, are bent and connected in the same direction as the center yokes 9 on the periphery. The core body 8 is composed of a main body 8 and a coil 10 wound around each leg-like core 8a, and the core main body 8 has a tip end of each leg-like core 8a as shown in FIGS. 1 and 3. Screws 4' are fixed to the inner surface of the protector plate 4 so as to be inserted into core holes 2e opened at the bottom of each mounting groove 2c.

Next, the wire guide of the present invention to be attached to the print head 1 constructed as described above will be explained. 11 in the diagram
1 shows a wire case configured such that its root end side 11' can be inserted into the center yoke 9 and fixed therein, and the root end of this case 11, which has an open upper surface, is provided with a first guide wall 11a. Reference numeral 11b denotes a first fitting chamber having a substantially U-shaped cross section, which is recessed horizontally in the substantially middle part of the wire case 11;
It shows the fitting groove recessed in the tip. Further, 11d is a small second fitting chamber recessed between the first fitting chamber 11b and the fitting groove 11c, and these chambers 11b,
11d and the fitting groove 11c are the communication grooves 11e and 1, respectively.
Continuous by 1e'. Reference numeral 12 denotes a double leg-shaped root end guide with a second guide wall 12a and a third guide wall 12b connected to each other on both sides, and this guide 12 is inserted into the first fitting chamber 1 of the wire case 11 which has an open top surface.
1b from above, and then insert the second
The guide wall 12a can be slid to the left in the drawing until the lower edge of the guide wall 12a is locked with the root end locking edge 11b' of the first fitting chamber 11b, and approximately half of the guide wall 12a can be positioned inside the center yoke 9. Reference numeral 13 denotes an intermediate guide fitted into the second fitting chamber 11d from above, and 14 denotes a distal end guide fitted into the fitting groove 11c from above, respectively. 14 is a mechanism in which each fitted state is maintained by a cover plate 15 attached to the upper surface of the wire case 11 after being fitted, and can be freely removed from the inside of the wire case 11 by removing this cover plate 15. It's getting old.

Further, as shown in FIG. 6A, the first guide wall 11a is provided with guide holes 11a' of the same number (7 or 9) as the number of movable pieces 6 arranged in a circular manner. In the second guide wall 12a of the root end guide 12, as shown in FIG. 6B, the same number of guide holes 12a' as the guide holes 11a' are arranged in an elliptical shape that is slightly smaller than the arrangement of the guide holes 11a'. It is perforated. Furthermore, the third guide wall 12 of this root end guide 12
b, as shown in FIG. 6c, the second guide wall 12a
The intermediate guide 13 has the same number of guide holes 12b' which are smaller in diameter than the guide holes 12a' and arranged in a vertically elongated oval shape, and the intermediate guide 13 has a width with an open bottom as shown in FIG. 6D. Narrow vertical guide groove 1
3a are arranged vertically. Further, as shown in FIG. 6E, the tip guide 14 is provided with extremely small guide holes 14a, the same number of which are vertically arranged in close proximity to each other. The root end guide 12 described above has a double guide structure including the second and third guide walls 12a and 12b, but it is also possible to form the entire body in an open state and drill a long and narrow guide hole therein. Of course it's fine.

In FIG. 1 and FIG. 5, 16 is the guide hole 12a', 12b', 14a and the guide groove 13a.
A wire receiver 17 having a stopper 17a is fixed to the root end of each wire 16 by caulking, and the stopper 17a of each wire receiver 17 and the first guide of the root end guide 12 The tip of each wire receiver 17 fitted into the guide hole 11a' of the first guide wall 11a is connected to the tip 6' of the movable piece 6, respectively, between the wall 12a and the first guide wall 11a, as shown in FIG. A coil-shaped spring 18 is attached which abuts the movable piece 6 in a direction opposite to the printing direction as shown in FIG. In FIGS. 1 and 2, 19 indicates the coil board, and 20 indicates the wire case 1.
1 shows the fixed plate connected in series. This fixing plate 20 is fixed to the front surface side of the protector plate 4 by the screws 4' mentioned above.

Since the wire guide of the present invention has the structure described above, in order to assemble it into the print head 1 assembled as shown in FIG. Each guide hole 12 provided in the guide plates 12a and 12b of 2
a' and 12b', and then the distal end side of the wire 16 is passed through the guide hole 14a of the distal guide 14.
Next, the guides 12 and 14 through which the printed wire 16 has been passed are fitted into the first fitting chamber 11b and the fitting groove 11c at the tip of the wire case 11, respectively, and the root end guide 12 is inserted into the root end of the wire case 11. slide to the side. When the root end guide 12 is slid in this manner, the tip of the wire receiver 17 attached to the root end of each printed wire 16 is pushed by the spring 18 and protrudes to the rear of the first guide wall 11a through the guide hole 11a'. do. Next, the intermediate guide 13 is inserted into the second fitting chamber 11d of the case 11, and each of the printed wires 16 is inserted into the longitudinal guide groove 13a.
Then, the cover plate 15 is attached to the upper surface of the wire case 11 to fix each guide 12, 13, 14. After completing the above work, close the root end side 11' of the wire case 11.
are inserted into the center yoke 9 so that the tips of the wire receivers 17 are pressed against the tips 6' of the movable pieces 6 attached to the housing frame 2, and the fixing plate 20 is secured to the protector plate 4 with screws 4'. Once it is fixed on the front side, all assembly work is completed.

When a print command signal is selectively energized from a print command device (not shown) to each coil 10 of the print head 1 with the wire case 11 assembled as described above, a magnetic force is applied to the iron core 8a of the energized coil 10. occurs, and the corresponding movable piece 6 rotates the distal end 6' side in the right direction in FIG. 1 using the support shaft 6a on the root end side as a fulcrum.
The wire 1 is in elastic contact with the wire receiver 17 by
6 resists the elasticity of the spring 18 to open each guide hole 12a', 12b' and 14a as well as the guide groove 13.
The wire 16 moves to the right in FIG. 1 while being guided by a, and the tip of the wire 16 is projected from the tip guide 14 toward the printing ribbon 21 and printing paper 22 to perform printing.

The wire guide of the present invention has the above-described configuration, and the work of passing the printed wire through the guide holes provided in both the rear and tip guides is extremely easy as it can be done with both guides removed from the wire case. In addition, the installation of both guides to the wire case is easy as it is sufficient to simply fit them in from above, and the installation of the intermediate guide is also extremely easy since the vertical guide groove is open at the bottom. In addition, the guide groove of the intermediate guide has the function of arranging each print wire in a vertical line and smoothly guiding the printing operation of each wire inserted into the guide hole of the tip guide. Furthermore, with the present invention, by attaching a cover plate to the top surface of the wire case, each of the rear end, middle and front guides fitted into the wire case can be fixed at once, so the work of fixing each guide is extremely simple. This has the advantage that the cost of the wire dot printer can be greatly reduced by reducing the number of man-hours required for machining and assembling the wire guide part, which has conventionally been extremely troublesome to structure and assemble.

In addition, with this invention, the tip guide can be freely replaced according to the printer's purpose, so there is no need to replace the wire guide or the entire printer every time the purpose is changed, and there is no need to replace the wire guide or the entire printer each time the purpose is changed. The guide and print wire have the advantage of being extremely easy and quick to replace by removing the wire case from the print head side.
Although the configuration is simple, it is highly practical for use with various dot printers.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is a front sectional view of a print head for a wire dot printer implementing the present invention, Fig. 2 is a side view thereof, and Fig. 3 is an internal structure of the print head. Fig. 4 is a plan view of the wire case, Fig. 5 is a front view of the printed wire, and Fig. 6 is a partially cutaway side view with the lid removed.
Figures A, B, C, D, and E are exploded side views of each guide member that guides the print wire. DESCRIPTION OF SYMBOLS 1... Printing head, 2... Housing frame, 6... Movable piece, 8... Core body, 8a... Leg-shaped core, 9... Center yoke, 10... Coil, 11... Wire case, 11 '... Root end side, 12... Root end guide, 12a', 12b'... Guide hole, 13... Intermediate guide, 13a... Vertical guide groove with an open bottom, 14... Tip guide,
14a...Guide hole, 15...Cover plate, 16...
...Printed wire.

Claims (1)

[Scope of utility model registration request] In a wire dot printer that performs printing by attracting and driving a plurality of movable pieces with a plurality of electromagnets, the print wire that is in contact with each movable piece is actuated to print, and the electromagnets and movable pieces are housed in the wire dot printer. The root end side of a wire case with an open top surface is removably inserted into the inside of the head body. Each guide can be inserted freely through the upper surface opening, and among these guides, both the root and tip guides are provided with a plurality of guide holes through which the printed wires are inserted, and A vertical guide groove with an open bottom is formed in the intermediate guide, into which each of the above-mentioned printed wires is inserted in a vertical line, and each guide is inserted into the upper opening of the wire case into which each of the guides is inserted. A wire guide for a wire dot printer, characterized in that a cover plate that presses down from above can be removed and freely covered.