JPS5872473A - Printer - Google Patents

Abstract

PURPOSE:To prevent the delay of the release of a printing hammer as well as raise the quality of print without causing any heating problems, etc., and without the need for complicated control by a method in which printing is made by driving a printing hammer for only odd-number figure or evennumber figure. CONSTITUTION:When exciting a solenoid coil 4, the attractive force of a permanent magnet 1 is counterveiled, and by the restoration force of a plate spring 5, a printing pin 6 is collided against a platen through a printing paper and an ink ribbon and the printing paper is printed. Whereupon, the solenoid coil 4 is wound around an even-number figure pole 30 but not around an odd-number figure pole 30, and also the printing pin 6 is provided only to an even-number figure plate spring 5. Thus, even when more than given number of solenoid coils 4 are excited, since magnetic flux flowing in the pole 30 can flow into the adjacent odd-number figure pole 30, the magnetic attractive force of the figure pole ready for releasing is not increased, and thereby the delay of the release does not occur and the letter aligning characteristics does not fall.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for reciprocating a printing hanoma that can be fully supported by an elastic support plate and held on a pole by the attraction force of a permanent magnet at a retracted position where the elastic support plate is elastically deformed along the printing position. The present invention relates to a printing device that prints by releasing the printing panel during this reciprocating movement.

As such a printing device, for example, Japanese Patent Application Laid-Open No. 51-40221
As disclosed in the above publication, there is a dot matrix splitter in which the printing panel is a printing pin for printing dots, and the explanation will be given below by taking a dot matrix printer as an example.

As shown in FIG. 1, the printing hammer drive device of a dot matrix printer includes a printing pin 6 which constitutes the printing hammer of the present invention, and a plate spring 5 which constitutes the elastic support plate of the present invention, on the front of which is attached a plunger 7 made of magnetic material. , a permanent magnet 1, a front yoke 2, a rear yoke 3, and a releasing electromagnetic coil 4 wound around the upper leg or ball portion 30 of the rear yoke 3. The lower end, that is, the fixed end of the leaf spring 5 is fixed to a spacer 8 provided on the front surface of the permanent magnet 1 via a screw 9 passing through the front door door 2. Note that 10 is a screw for fixing the leaf spring 5 to the spacer 8.

Further, the upper end of the front yoke 2 is provided with a groove through which the printing pin 6 and the plunger 7 pass.

The printing pin 6 is held by the ball portion 30 by the magnetic attraction force of the permanent magnet 1 at the retreated position where the leaf spring 5 is elastically deformed. When the electromagnetic coil 4 is excited, the magnetic attraction force is canceled out, and the plate nozzle 5 flies due to its restoring force, causing the oil printing pin 6 to collide with a platen (not shown) via a printing paper (not shown) and a quick rib (not shown). Dots are printed on this printing paper.

Therefore, the permanent magnet 1, yoke 2.5, etc. are extended along the printing position, and a plurality of leaf springs 5 supporting the printing pins 6 are provided at different intervals along the printing position to accommodate these components (not shown). The printing paper is moved reciprocatingly along the printing position 11 via a hammer bank, and the printing paper is fed step by step one dot line at a time, and during the reciprocating movement, the electromagnetic coil is energized and the printing pin 6 is released, thereby printing one line. It becomes possible. That is, the hammer bank is reciprocated by a distance corresponding to the number of digits printed by one printing pin/6.

The dot printer with the above configuration always had the following problems. That is, when more than a predetermined number of electromagnetic coils 4 are excited and the printing pins 6 are completely released, there is a problem that the release of the printing pins 6 is delayed and the character arrangement characteristics deteriorate. This phenomenon is also disclosed in Japanese Unexamined Patent Publication No. 56-56885, and there is a method in which the excitation time of the electromagnetic coil 4 is increased to prevent the release from being delayed, but the control becomes complicated and the electromagnetic There is a new problem that the heat generation of the coil 4 increases.

Further, if the central printing pin 6 is released after a predetermined time delay after the printing pins 6 on both sides have been released, the release is delayed and the character arrangement characteristics deteriorate as described above.

This phenomenon is thought to be because the magnetic flux flowing through the adjacent ball portions 0 flows into the center ball portion 50, making the magnetic attraction force at the center stronger and canceling out by the excitation of the electromagnetic coil 4 delayed. In this case as well, it is possible to prevent the release from being delayed by increasing the excitation time of the electromagnetic coil 4 as described above, but the same problem as described above occurs.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to prevent deterioration in print quality. Delay in releasing the printing knob when more than one printing hammer is driven, or the central printing knob/
This system is characterized by preventing delays in the release of prisoners.

FIG. 2 shows an embodiment of the present invention, in which the electromagnetic coil 4 is wound around even-numbered ball portions 50, and the odd-numbered ball portions 30Kl'j are not wound in the same manner. Further, the printing pins 6 are not provided in the plate holes 5 which are sucked and held by the ball portions 50 of the odd-numbered digits. That is, the printing pins 6 are provided only on the leaf springs 5 of even number digits.

As a result, even if more than a predetermined number of electromagnetic coils 4 are excited,
Since the magnetic flux flowing through the ball portion 50 can flow into the adjacent ball portion 5θ of the odd-numbered digit, the magnetic attraction force of the ball portion 50 of the digit to be released will not increase, and the release will not be delayed. It disappears. In other words, the character arrangement characteristics do not deteriorate. Furthermore, there is no delay in the release of the central digit, and the character arrangement characteristics do not deteriorate. In addition,
According to this embodiment, the ball portions of odd-numbered digits act as cooling fins to dissipate heat generated in even-numbered digits by thermal conduction, so the cooling capacity is increased and high-load printing is possible.

Although the printing pins 6 are driven only for even-numbered digits, it may be possible to drive only odd-numbered digits, and although the printing pins 6 are provided only for even-numbered digits, they may be provided for all digits. Good (although half of it is never used).

In the above embodiment, the printing pins 6 of only odd numbered digits or only even numbered digits are driven and printed by the mechanical structure, but the electromagnetic coil 4 and the printing pins 6 are provided for all digits, and electrically only the odd numbered digits or only the even numbered digits are driven. It may be controlled to drive only the printing pins 6 of even-numbered digits. In this case, it is also possible to alternately drive the printing pins 6 for only odd-numbered digits or only for even-numbered digits, and the life of the printing pins 6 and the like can be extended. Further, although the embodiment has been described as a dot matrix printer, it is also possible to use the printing pin 6 as a normal printing hammer and apply it to a line printer that prints by colliding with the type on the type carrier.

As described above, according to the present invention, it is possible to prevent a delay in the release of the printing hammer without requiring complicated control or causing problems such as new heat generation, and to improve printing characteristics such as character arrangement characteristics. Quality can be improved.

[Brief explanation of the drawing]

The figures show an IJ printer which is an embodiment of the device of the present invention, in which Fig. 1 is a cross-sectional side view showing an example of a printing hammer drive device, and Fig. 2 is an exploded perspective view showing one embodiment. It is a diagram. In the figure, 1 is a permanent magnet, 2 is a front yoke, 5 is a rear yoke, 50 is a pole part, 4 is a release electromagnetic coil, 5, . is a leaf spring (elastic support plate), 6
is a printing pin (printing hammer), 7 is a plunger, 8Fi spacer, 9° and 10 are fixing screws.

Claims (1)

[Claims] 1. A permanent magnet extending along the printing position, a yoke having a plurality of poles arranged in parallel along the printing position, and supported by an elastic support plate, the elastic support plate being elastically deformed. A printing tab which is attracted and held on the pole in the retracted position, a releasing electromagnetic coil attached to the pole, and a printing tab that accommodates these permanent magnets, a yoke, an elastic support piece, a printing tab, etc. The printing device comprises: a printing device which reciprocates the knob pack along a printing position, excites the releasing electromagnetic coil during this reciprocating movement, releases the elastic support plate, and prints with the printing knob; A printing device characterized in that, among the plurality of printing hammers provided along the printing position, printing is performed by driving printing hammers for only odd numbered digits or only for even numbered digits. 2. The printing device according to claim 1, wherein the release electromagnetic coil is attached only to odd-numbered digits or only to even-numbered digits of the pole. 2. The printing device according to claim 1, wherein the printing panel is supported only by odd-numbered digits or only by even-numbered digits of the elastic support. 4. The printing device according to claim 1, wherein the release electromagnetic coil is excited only for odd number digits or only for even number digits.