JPH0536690Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an impact type printer head that prints characters, symbols, etc. in a dot matrix.

[Prior Art and Problems to be Solved] As a first conventional example of a conventional printer head, the rear end of a printing lever that drives a printing element is swung by the end surface of a side wall of a yoke that constitutes an electromagnetic drive device. There are things that are accepted freely.

According to the first conventional example, the rear end of the printing lever extends to the side wall of the yoke of the electromagnetic drive device, so the overall length of the printing lever is long, the inertia of the printing lever is large, and the printing This is becoming an impediment to faster speeds.

A second conventional example of a conventional printer head is disclosed in Japanese Utility Model Application No. 60-42638. This is an example of a head in which the rear end of the printing lever is not supported by the end surface of the side wall of the yoke, and a coil is wound around the central leg of the three legs of the E-shaped yoke.
These legs swingably support the rear end of the amatia, and the leg closest to the center of the head among the three legs attracts and drives the amatia.

However, according to the above-mentioned second conventional example, in addition to the leg part which is the receiving part of the rear end of the amatia, the leg part as the suction part of the amatia is separately provided. In addition to the part that faces the leg that serves as the receiving part, a part that faces the leg is required as a suction part, which increases the overall length of the amatia, increases the inertia of the print lever, and increases the speed of printing. It becomes a hindrance. Moreover, the configuration is complicated, the head becomes large, and the cost increases.

[Purpose of the invention] The purpose of the invention is to simplify the configuration of the print head, reduce costs, shorten the overall length of the print lever, reduce its inertia, and realize faster printing.

[Means for Solving the Problems] The printer head according to the present invention includes a printing lever that drives a printing element at the tip, an electromagnetic drive device that drives the printing lever, and a return spring that applies a returning force to the printing lever. In the printer head, the electromagnetic drive device has a core having a U-shaped cross section and a pair of legs extending substantially parallel to each other, the inner leg of the pair of legs extending substantially parallel to each other. is an iron core facing the printing lever and around which a driving coil is wound.A receiving part is provided near the outer edge of the end face of the iron core to swingably receive the rear end of the printing lever. The printing lever is driven by energizing the coil and attracting the iron core or the printing lever.

[Function] A receiving portion for the rear end of the printing lever is provided near the outer edge of the end face of the iron core near the center of the head for attracting the printing lever.

Therefore, since the receiving part of the rear end of the print lever is located near the iron core near the center of the head,
This receiving portion is provided near the center of the head.
Therefore, the rear end of the print lever also moves toward the center of the head. Further, since there is no need to provide the suction portion of the print lever in addition to the above-mentioned iron core with the receiving portion provided nearby, the print lever does not require any extra length.

Therefore, the overall length of the print lever can be made as short as possible, the inertia of the print lever can be reduced, and high-speed printing can be achieved.

[Example] An example of the present invention will be described based on FIG. In the present invention, the electromagnetic drive device includes a core 2 having a U-shaped cross section and a pair of legs 2a and 2b extending parallel to each other, and a core 2 wound around the inner leg 2a of the pair of legs. It is composed of a drive coil 1 and a drive coil 1. That is, the inner leg 2a of the pair of legs is an iron core, and a plurality of cores 2 are arranged radially with the leg 2b on the outside and the iron core 2a on the inside. The leg portion 2b of the core 2 is provided with a yoke plate 3 which is constructed by laminating three magnetic plates. The yoke plate 3 is held between a head cover 4 and a core 2. The same number of pressing springs 5 as the cores 2 are radially housed in the inner surface of the head cover 4 in correspondence with the cores 2. In addition, a ring-shaped damper 6 is provided on the inner surface of the head cover 4.
is stored. A printing lever 7 is opposed to the end face of the pressing spring 5. This printing lever 7 also has core 2
They are arranged radially in the same number as the cores 2, with the rear end facing outward and the tip end facing inside. The rear end of a wire 8 as an example of a printing element is integrally attached to the tip of the printing lever 7. A return spring 9 is opposed to the print lever 7, which causes the wire 8 to
is biased backwards. A protrusion 7a is formed in the middle of the printing lever 7 and can come into contact with the iron core 2a. The yoke plate 3 has holes radially formed inside thereof corresponding to the printing lever 7, and the printing lever 7 is inserted therein. The receiving portion 10 is provided at the outer edge of the end face of the iron core 2a, and faces the rear end face of the printing lever 7. The end surface of the rear end of the printing lever 7 is pushed by the pressing spring 5, and the other end surface of the rear end comes into elastic contact with the receiving part 10, so that the printing lever 7 is moved against the plate surface using the rear end as a fulcrum. It is supported so that it can swing freely in the direction along the line.

While a drive signal is not supplied to the drive coil 1, the tip of the printing lever 7 is pushed backward by the spring force of the return spring 9 and comes into elastic contact with the damper 6, and the iron core 2a and the protrusion 7a are separated. .

A drive signal is supplied to the drive coil 1, and the iron core 2a
When energized, the protrusion 7a of the printing lever 7
a, and the wire 8 is attracted and joined, and the tip of the print lever 7 moves forward to push the wire 8 forward.

Further, the installation form of the receiving portion is not limited to the above embodiment, and various changes are possible. For example, in the second embodiment shown in FIG. 2, the receiving portion 10A is provided on the coil bobbin 11, and is positioned by a wire guide 12 so as not to move.

In FIG. 2, parts corresponding to those in the embodiment shown in FIG. 1 are given the same reference numerals, and individual explanations will be omitted. Furthermore, it is also possible to form the receiving part integrally with the iron core 2a.

[Effects of the invention] According to the invention, a receiving portion for the rear end of the printing lever is provided near the outer edge of the end face of the iron core near the center of the printing head for attracting the printing lever.

Therefore, since there is a receiving portion for the rear end of the print lever near the iron core located near the center of the print head, this receiving portion is provided near the center of the head. Therefore, the rear end of the print lever also moves toward the center of the head. Further, since there is no need to provide a special suction portion of the print lever in addition to the iron core in which the receiving portion of the rear end of the print lever is provided nearby, the print lever does not require any extra length.

Therefore, the overall length of the print lever can be made as short as possible, the inertia of the print lever can be reduced, and high-speed printing can be achieved.

[Brief explanation of the drawing]

The drawings show an embodiment of a printer head to which the present invention is applied. FIG. 1 is a cross-sectional view of the first embodiment of the present invention, and FIG. 2 is a cross-sectional view of the second embodiment of the present invention. 1... Drive coil, 2... Core, 2a... Leg (iron core), 2b... Leg, 7... Printing lever, 8...
... wire (printing element), 9 ... return spring, 10,
10A... Receiving part.

Claims (1)

[Claims for Utility Model Registration] A printer head having a print lever that drives a print element at its tip, an electromagnetic drive device that drives the print lever, and a return spring that applies a return force to the print lever, The electromagnetic drive device has a core having a U-shaped cross section and a pair of legs extending substantially parallel to each other, and the inner leg of the pair of legs is connected to the printing lever. an iron core facing the drive coil and around which a drive coil is wound; a receiving part that swingably receives the rear end of the printing lever is provided near the outer edge of the end face of the iron core; the drive coil A printer head characterized in that the printing lever is driven by applying electricity to the iron core and attracting the printing lever.