JPS6324837B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing device such as a calculator, and more particularly to a printing device capable of printing on printing paper at different positions.

A printing device that has a type drum surrounding the type drum and a hammer fixedly housed inside the type drum, and prints by striking the type from the inside with the hammer, is disclosed in, for example, USP 3, 717, 234. It is known by the number etc. Such an inner hammer type printing device has a hammer housed within the type drum, so it is relatively quiet.

On the other hand, recently, for special purposes such as calculators, there is a demand for something that can print on the roll paper inside the calculator and also on a notebook on a desk. However, it is extremely difficult to achieve such a function with an inexpensive configuration.

The present invention has been made in view of the above points, and an object of the present invention is to provide a printing device that can accurately print on printing paper at different positions with an extremely simplified configuration.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a sectional view showing an example of the preliminary stage for carrying out the present invention, where DT is a small desk calculator, K is its key group, DS is a numeric display made of liquid crystal, etc., and CD is a typeface made of rubber, etc. The drum, C is the type group, IR is the ink roller that supplies ink to the type group C, H is the hammer group stored in the drum CD, and if you change the position as shown in H', it will print on the paper P2 on the desk. can. KA is a paper cassette that stores rolled paper LP.
It is configured to be detachable from the calculator DT. S is for cassette
This is a switch that detects whether the KA is attached or removed.For example, when it is loaded, it is turned on to hold the hammer H at the solid line position, and when it is removed, it is turned off and held at the dotted line position. Alternatively, even if it is in the loaded state, it can be switched to the H' position and used according to an instruction from the key group K. KB is the key input circuit, CAL is the calculation section,
PC is a printing control circuit.

FIG. 2 is an example circuit diagram of the calculator shown in FIG. 1, in which a DC motor is used as a drive source for rotating the type drum. In the figure, L is a lamp, DD
is a disk for generating a type position signal, Ca is a hole corresponding to the type position, h1 is a hole that informs the print control circuit PC of the first home position, and h2 is a hole that informs the print control circuit PC of the second home position. . CE, h1
D and h2D are detectors that detect holes Ca, h1, and h2, respectively, CC is a character counter, and detector CE
It has a function to detect the type and position of type by counting the character pulse CA. R indicates the reset input of the character counter CC. HS is an electromagnetic device that switches the position of the hammer H, A1 and A2 are AND gates, I1 is an inverter, and OR1 is an OR gate.

Assume that when cassette KA is loaded, switch S is on and the output of OR gate OR1 is at low level. Therefore, and gate A1
is open, and gate A2 is closed,
Since the electromagnetic device HS is not energized, the hammer H is at the solid line position in Figure 1, and as is well known, the hammer H is projected to the left and one of the type groups C is brought into contact with the platen PL on the cassette KA side. Then, printing is performed on the roll paper P1 in between.

Next, the hammer position switching command from key group K sets the signal PS to high level and gate A
1 and open AND gate A2. Also, the electromagnetic device HS is energized to switch the hammer to the dotted position H'. This changes the home position from h1 to h2
The control circuit PC determines this, resets the character counter CC, etc., and changes the counting contents. For example, in the illustrated example, by shifting three characters from when h1 is the home position, h2 can be treated as the home position. Therefore, for example, when the AND gate A2 is open, when the character counter CC counts three characters, it is reset and counted again from 1, and the characters are counted correctly and printed on the printing paper P2 with h2 as the home position. When the cassette KA is removed as described above, printing is similarly performed on the printing paper P2 at the position of the hammer H'.

Now, in the example in Figure 1, the hammer H is single,
Although the case is shown in which the position is switched to H' by electromagnetic means, an electromagnetic device HS may be required for this purpose, or the printing position may not be aligned correctly. The embodiment of the present invention solves this problem and has the hammer structure shown in FIG. This hammer structure is used in place of hammer H in FIG. That is, hammers H1 and H2 are provided at each printing position and driven by a common coil C. Therefore, the printing device can be changed simply by switching the direction of current supply to the terminals P and Q, resulting in an extremely simple configuration.

In FIG. 3, H1 and H2 are printing hammers that are permanently magnetized with a plurality of magnetic poles at positions facing a yoke Y, which will be described later. B1 and B2 are springs for generating hammer return force after printing. CI is a hammer drive coil that is wound around a circular yoke Y made of soft magnetic material. York Y
has notches facing in the radial direction at different positions in the circumferential direction, and hammers H1 and H2 are movably inserted into the notches, respectively. now,
When printing with the printing hammer H1, when a current i1 is applied to the terminal P of the coil C, one end Y1 of the yoke Y on the printing hammer H1 side becomes the north pole, and the other end Y4 of the yoke Y on the printing hammer H1 side becomes the south pole. Become. As mentioned above, the printing hammer H1 is made of a multi-pole permanent magnet structure, so as a result, the north pole of the yoke Y1 and the south pole of the permanent magnet of the hammer H1 attract each other, and the north pole repels the north pole of Y1. Further, the S pole of the yoke Y4 and the N pole of the permanent magnet of the hammer H1 attract each other, and the S pole repels the S pole of Y4. As a result, the hammer H1 generates a moving force F.

On the other hand, due to the current i1, one end Y2 of the yoke Y on the printing hammer H2 side becomes the S pole, and the yoke Y
The other end Y3 on the printing hammer H2 side becomes the north pole.
The printing hammer H2 also has a multi-pole permanent magnetization configuration. As a result, the S pole of yoke Y2 and the N pole of the permanent magnet of hammer H2 attract each other, and the N pole of Y2
The N pole of the yoke Y3 and the S pole of the permanent magnet of the hammer H2 attract each other, and the N pole repels the N pole of Y3. As a result, Hammer H2
, a force f in the opposite printing direction is generated.

That is, when a current i1 is applied to the terminal P of the coil C, the hammer H1 generates a printing force F and presses the type against the roll paper P1 to print, but the hammer H2 does not print due to the counterprinting force f.

Also, when current i2 is applied to terminal Q of coil C, hammer H2 generates printing force F in reverse, hammer H1 generates counterprinting force f, and hammer H2 presses the type against printing paper P2 on the desk. and print.

As described above, the printing device of the present invention includes a type drum having a group of type characters around it, and a hammer mechanism that is housed in the type drum and performs printing by protruding the type outward from the inside. a yoke having an annular shape and having first and second notches facing in the radial direction at different positions in the circumferential direction; a coil wound around the yoke;
a first hammer that is movably inserted into the notch and is magnetized with a plurality of magnetic poles at a position facing the first notch so as to protrude outside the yoke when the coil is energized in a predetermined direction; The coil is movably inserted into the second notch, and the position facing the second notch is magnetized with a plurality of magnetic poles so that it protrudes outside the yoke when the coil is energized in a direction opposite to the predetermined direction. The first hammer and the second hammer are configured by switching the current direction to the coil.
Since the hammers are made to alternatively protrude in the direction of the type on the type drum, it is possible to accurately print on type sheets at different positions, although the configuration is extremely simplified.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of a preliminary stage for implementing the present invention, FIG. 2 is an example of a control circuit thereof, and FIG. 3 is an explanatory diagram of a hammer structure used in an embodiment of the present invention. CD...Type drum, H, H1, H2...Hammer, P1, P2...Print paper.

Claims (1)

[Scope of Claims] 1. A printing device having a type drum having a group of type characters around its periphery, and a hammer mechanism housed in the type drum for printing by protruding type characters outward from the inside, wherein the hammer mechanism is annular. and a first and a second radially located at different positions in the circumferential direction.
a yoke provided with a notch; a coil wound around the yoke; and when the coil is movably inserted into the first notch and is energized in a predetermined direction;
A first magnetized with a plurality of magnetic poles is located at a position facing the first notch so as to protrude outside the yoke.
a hammer that is movably inserted into the second notch and faces the second notch so as to protrude to the outside of the yoke when the coil is energized in a direction opposite to the predetermined direction; a second hammer magnetized by a plurality of magnetic poles, and by switching the direction of energization to the coil, the first hammer and the second hammer can be used to selectively press the type on the type drum. A printing device characterized in that the printing device is made to project in different directions so as to be able to print on printing paper at different positions.