JPH0129706B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing device having a hammer in a type wheel, and an object of the present invention is to provide a printing device that can be made extremely compact as a whole.

This will be explained below with reference to the figures.

Figures 1 to 4 show an embodiment of the present invention, in which a type ring unit 1 is formed by fitting the back protrusion 1D of the type belt 1 into the hole 2A of the cylindrical support member 2 and winding it around.
0 is rotated by a coin-type battery DB housed in its inner end and an outer rotor-type pulse motor PM, characters are selected during one revolution, and the built-in printing hammer 4 presses the protrusion 1D to form the type 1A. is projected and brought into contact with the roll-shaped paper P, and the ink on the type 1A applied by the ink roller IR is transferred and printed.

The outer rotor type pulse motor PM has a permanent magnet Mg (Fig. 14) which is the outer rotor.
is fixed to the end of the rotating shaft of the support member 2 as shown in the figure, and the toothed yokes F1-F2, F1'-
By energizing F2', a predetermined type is stopped at a printing position.

In addition, protrusions 1B, which are force transmitting parts, are provided on the outer periphery of both ends of the type wheel unit 10 at locations away from the ink roller IR, and after approximately one rotation, characters are selected, and one line is printed, the protrusions 1B are moved to the opposite position. The printing paper P guided by the platen 6 and the paper guide 9 is driven upward only while engaged with a pair of pinch rollers 7 provided at the platen 6 and the paper guide 9. That is, the protruding portion 1B is provided at the missing portion of the type character 1A of the type belt 1, and this missing portion is set in accordance with the paper feed timing after printing is completed, and is connected at the end portion 1C.

The type 1A, the protrusions 1B, and the protrusions 1D on the back side of the type 1A are made integrally, as shown in FIG. 7 and its presser spring 8, it is possible to feed the paper as desired without slipping.
In this way, the paper feeding mechanism does not require any complicated parts, takes up little space, and has an extremely simple structure that allows paper feeding.
Since the motor is housed, it can be made even more compact.

In addition, in conventional devices, the rubber roller for paper feeding and the pinch roller are always in contact with each other, so a mechanism is required to separate them when loading paper. However, as shown in FIG. 1, according to the present invention, the paper P is normally kept in the paper guide 9.
The protrusion 1B only touches the platen 6 lightly, and the protrusion 1B touches the pinch roller 7 only when feeding the paper.
There is also an advantage that the paper P can be corrected immediately even if it is slightly pressed against the guide 9 and the platen 6.

Furthermore, as shown in FIG. 1, the detection switch S of the paper cassette KK can also be installed at the location where the paper feeding rubber roller is located, making it possible to obtain a small calculator DT equipped with a smaller printing device.

In addition to driving the pulse motor PM, this battery DB is also used to drive the liquid crystal display LC, arithmetic chip LSI, and key pattern KP. These are connected by a flexible printed circuit board FC.
Because FC is thin and flexible, it is extremely effective for hammers, batteries, motors, and internal and external electrical connections in type wheels.

Furthermore, since the arithmetic chip LSI and other electronic components are housed within the type wheel unit as shown in FIG. 1, the overall size is extremely small.

Also, by surrounding this calculation chip LSI with a shielding material SD, noise from the hammer solenoid 3 can be prevented. It may also be a memory LSI.

Also, the liquid crystal display LC is as shown in the figure, LC1, LC
2. Multiple LC3, etc., and type wheel unit 10
It is easy to see because it is arranged so as to surround it, and it is also small. Also, since the hammer 4 is tilted upward at an angle of 20 to 30 degrees, the printed characters can be seen easily.

Also, since the top of the key pattern KP is only insulating, conductive rubber SG, DG, and key top KT, the keyboard KB is extremely thin, and also has a paper cassette.
Since there is no need for a paper feeding drive source in the KK, a large amount of roll paper LP can be stored, which is extremely preferable. S is a cassette detection switch.

Figure 4 shows a battery DB housed inside the ink roller IR.It is preferable to synchronize the battery DB replacement period with the ink roller IR replacement period so that the work can be done at the same time. Other electrical components, such as a small speaker, can be stored in the battery storage section shown in FIG.

Fig. 5 shows another embodiment of the present invention in which the hammer H in the type ring can be rotated, in which DT is a small desk calculator, K is its key group, LC1 to LC3 are numerical displays made of liquid crystal, etc., and IR. is an ink roller that supplies ink to the ink-impregnated type C, and H is a group of hammers housed in the type wheel.By switching their positions as shown by H', printing can be performed on the paper P2 on the desk.

KK is a paper cassette containing roll paper P1,
Since the type C contains ink and has the property that the ink can move inside, the ink roller IR can also be housed in the type ring and ink can be supplied from its contact portion to the type surface.

The paper cassette KK is configured to be detachable from the calculator DT. A switch S detects whether the cassette KK is attached or removed, and is turned on to hold the hammer H at the solid line position when it is loaded, and turned off and held at the dotted line position H' when the cassette KK is removed. 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 K.

FIG. 6 is a diagram showing an example of a circuit that can be considered when operating the printing device shown in FIG. 5, and is an example in which a DC motor is used as a drive source that is housed in the type wheel and rotates it. Key input circuit KI, calculation unit CAL,
The print control circuit PC and other logic elements are housed in the LSI in the type wheel described above.

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 PC of the first home position, and h2 is a hole that informs the PC of the second home position. be. CD,
h1D and h2D are detectors that detect Ca, h1, and h2, respectively, CC is a character counter, and the detector
It has a function to count the character pulse CA of CD and detect type and position of type. R indicates the reset input of CC. HS is an electromagnetic device that switches the position of hammer H, A1 and A2 are and gates,
11 is an inverter, and OR1 is an OR gate.

Assume that when the cassette KK is loaded, the switch S is on and the output of the OR gate OR1 is at a low level. Therefore, the AND gate A1 is open, A2 is closed, and the electromagnetic device HS is not energized, so the hammer H is at the solid line position in FIG. Place type C in cassette on platen on KK side.
Bring it into contact with the PL and print on the paper P1 between them. Next, the hammer position switching command from key K sets the signal PS to high level and gate A
Close 1 and open A2. Also, energize HS and switch the hammer to the dotted line position H'. As a result, the home position is switched from h1 to h2, and the control circuit PC
determines this, resets the character counter CC, etc., and changes the count contents. For example, in the illustrated example,
By shifting 3 characters from when h1 is the home position, h2 can be treated as the home position.
Therefore, for example, when AND gate A2 is open, when CC counts 3 characters, it is reset and counted again from 1, and the characters are correctly counted and printed on P2 with h2 as the home position. When removing the cassette KK as mentioned above, use the hammer as well.
Print on P2 at position H'.

In the example shown in Fig. 6, a special hole h2, detector h2D, etc. are required for switching control of the home position, but in the other example shown in Fig. 7, switching control is performed with one detector h1D as usual. I do.

In the figure, F1 is a flip-flop, KT is a counter that counts character pulses, and DK is a decoder that detects only a specific count value, for example, 3, of the counter KT.

When the cassette KK in Fig. 5 is loaded, the hammer H is at the position indicated by the solid line as described above, and the AND gate A3 is open and A4 is closed.
The character counter CC is reset by the output signal from the detector h1D at the home position h1 through the AND gate A3, and performs the same operation as the normal printing operation on roll paper. When AND gate A3 closes and A4 opens due to print switching command signal PS or cassette attachment/detachment signal S, AND gate A
CC is reset by the output timing from 4.

That is, the output of h1D causes flip-flop F1
Since the character pulse CA after is set passes through the AND gate A5 and is counted by the counter KT, when the specific value decoder DK detects, for example, 3, it outputs and is applied to the AND gate A4. As mentioned above, in this case, AND gate A4 is open, so immediately after CC counts 3, it is reset and CA starts counting again from 1. Therefore, the character position is shifted by 3, that is, the same state as when the second home position h2 in FIG. 6 was detected, and thereafter, the well-known printer operation of the character drum is performed, so that printing is performed correctly on the paper P2.

In contrast to FIGS. 6 and 7 above, FIGS. 8 and 9 are circuit diagrams when a pulse motor PM is used instead of the DC motor, and is used in the example shown in FIG. 5, which is an embodiment of the present invention.

As is well known, when using a pulse motor PM, there is no need to detect the position of the printed characters, and the type and position of the printed characters can be detected by counting the pulses SP that drive the pulse motor.

Therefore, printing is normally possible with just one detector at the home position, and the example in Figure 8 is an example in which detectors at home positions h1 and h2 are provided, similar to the example in Figure 6, and the home position is This can be realized with a simple configuration that only requires changing the reset timing of the character counter CC according to switching of h1 and h2.

The example in Figure 9 is similar to the example in Figure 7, with one detector h1.
This is an example of switching the printing position with D, and the operation is shown in the seventh
It is the same as the example shown.

The example in FIG. 5 shows a case where the hammer H is single and its position is switched to H' by mechanical or electromagnetic means (not shown). may not be aligned correctly and may fall out.

The hammer structure example shown in FIG. 10 is another embodiment of the present invention that solves this problem, and is an example in which hammers H1 and H2 are provided at each printing position and driven by a common coil C _p , and are connected to terminals P and Q. The printing position can be changed simply by switching the current direction, resulting in an extremely simple configuration.

In FIG. 10, H1 and H2 are printing hammers made of permanent magnets. C _p is a hammer driving coil that is wound around a circular yoke Y made of a soft magnetic material. Furthermore, since the inside of this annular yoke Y also becomes a dead space, it is possible to insert the aforementioned LSI or the elongated battery DB as shown in the figure. Now, when printing with printing hammer H1, terminal P of coil C _p
When a current i1 is applied to, the printing hammer H1 of the yoke Y
One end Y1 of the side becomes the north pole, and the other end Y4 of the printing hammer H1 side of the yoke Y becomes the south pole. Since the printing hammer H1 is made of a multi-pole permanent magnetization configuration as shown in the figure, as a result, the N pole of the yoke Y1 and the hammer H
The poles of permanent magnet 1 attract each other, and the N pole of Y1 attracts the N pole of Y1.
The S pole of yoke Y4 and the N pole of the permanent magnet of hammer H1 attract each other, and the S pole is repelled by Y4.
It repels the S pole of . 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 an S pole, and the other end Y3 of the yoke Y on the printing hammer H2 side becomes an N pole. The printing hammer H2 has a multi-pole permanent magnetization structure as shown in the figure. As a result, the S pole of yoke Y2 and the N pole of the permanent magnet of hammer H2 attract each other, the N pole repels the N pole of Y2, and the N pole of yoke Y3 and the S pole of the permanent magnet of hammer H2 attract each other. The Aimata N pole repels the N pole of Y3. As a result, Hammer H
2, 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 _Cp , the hammer H1 generates a printing force F and prints on roll paper, etc., 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 _p , hammer H2 generates a printing force F in the opposite direction, hammer H1 generates a counter printing force f, and the hammer H2 prints on the paper P2 etc. on the desk. . Hammer H again
1 and H2 are maintained at a stationary position at the minimum magnetic resistance position by the action of the yoke Y and attractive force during the normal standby state. Therefore, if it becomes de-energized at the time of return, it will return by itself due to its holding force, but the springs B1 and B
If 2 is provided, it becomes even more reliable. Furthermore, when printing on the paper P2 on the desk, the printing position may be difficult to see and may be printed at the wrong position.

To solve this problem, use a calculator as shown in Figures 5 and 11.
Make part of the DT case transparent. In this way, as shown in FIG. 11, the lines l1 to l on paper P2
4th prize can be seen through the TO. In addition, if the printing part is placed directly below the liquid crystal display LC1 as shown in Figure 5, it is possible to print directly below the number displayed on the display LC1 as shown in Figures 5 and 11, so the printing position can be adjusted. It is extremely easy to confirm.

Part TO of the main body case may be an extension of the glass substrate of the liquid crystal display, or may be made of translucent plastic material. It would be even more convenient if a scale or the like was provided there.

In addition to the transparent plate, various types of printing position confirmation means such as indicators, markers, marks, protrusions, etc. can be attached to the calculator body.

Alternatively, the substrate of the display device LC1 may be extended to provide a paper cutter N as shown in FIG. This can be done by providing teeth on a part of the reflecting plate, polarizing plate, glass substrate, etc., or by attaching it to the case of the type wheel unit.

Furthermore, in recent years, electronic devices equipped with voice generating devices have been put into practical use, but in the case of a small calculator like the one in this embodiment, the location of the device is also an issue. However, the fifth
If the speaker SP is placed in the dead space between the type ring and the keyboard as shown in the figure, it is very preferable to make the sound emitted from the position shown in FIG. 11.

FIG. 12 is still another example of FIG.
In the figure, hammer H3 has multi-pole magnetized magnets M1 and M2 embedded and fixed therein, and hammer H3 has a pair of semicircular yokes Y sandwiched between them with a slight gap. 'Y'1~
Y'4 and each yoke has a series of coils C _p wound around it.

Arrow direction A in FIG. 12 is the non-printing direction, and arrow direction B is the printing direction. In order to bias the hammer H3 in the A direction, the Y'1 to Y'4 of the yoke are
3. It is sufficient to pass current through the coil C _p so that it has the polarity as shown in Figure 2. In addition, in order to bias in the opposite direction B, the first
3 Excite the yoke as shown in Figure 4.

More specifically, Fig. 13 shows the positional relationship between each yoke and magnets M1 and M2 and the state of magnetic flux in a stationary state. length l
Then, the structure is such that the polarization line of the magnet is located above 1/2). The magnetic flux due to each yoke and magnet in this state is as shown in the diagram.
Since the hammer receives equal suction force from both yokes, it does not receive unbalanced force. Also, when the hammer is moved from this resting state in the direction of arrow A or B, the magnetic resistance increases, and a force is applied in the direction C that reduces the magnetic resistance, causing the hammer to return to its resting state. act.

Therefore, the resting state is an extremely stable state,
No elastic member such as a spring is required to return the hammer to a stationary state. FIG. 13 shows a state in which the hammer H6, which is biased in the direction of the arrow A, is stopped by a stopper (not shown), and the magnets M1,
The polarization line of M2 is on each surface of the yoke 5a, 5b, 5'a,
It is regulated at a position that does not deviate from 5'b. When the current in the coil _Cp is cut off in this state, a restoring force C acts on the hammer H3 to return it to its resting state. When a signal is applied to the coil so that the yoke has the polarity shown in FIG. 13 to perform printing, the above-mentioned return force is increased and the hammer H3 moves in the printing direction B.
FIG. 13 5 is a diagram showing the state during printing, and in this case,
The polarization lines of magnets M1 and M2 are on each side 5 of the yoke.
Printing is performed by bringing the aforementioned type 1A into contact with the paper P at a position that does not deviate from a, 5b, 5'a, 5'b. When the current in the coil C _p is cut off, the hammer quickly returns to its resting state due to the return force C. Here, if the type belt 1 is provided with twice the number of normal type characters as shown in Fig. 12, and the hammer H3 is used to print in both directions A and B, the same content can be printed almost simultaneously on multiple printing papers, and the number of characters can be printed at the store. It is preferable that the customer receipt and the roll paper for storage can be printed at almost the same time, such as in a cash register at a store. Also, in the configuration shown in FIG. 1, the pinch roller 7 is elastically supported by the spring 8, so when the receipt paper is inserted onto the roll of paper P, the pinch roller 7 can easily retreat backwards, so that the receipt It is also easy to print on. That is, since the printing is performed by bringing the ink on the type into contact with the paper, another advantage of this embodiment is that printing can be performed without any problem even if the thickness of the printing paper varies to some extent.

Also, Figure 12 shows that it is possible to print almost simultaneously on two sheets of printing paper in a 180° direction;
To change the direction to 90 degrees, that is, to the type shown in FIG. 10, the center part of the hammer H3 in FIG. Just do it. Also, not only 90°
It is extremely preferable to bend the hammer at an angle of about 110° to 120°, as shown in FIG. 1, so that the horizontal hammer can be tilted upward by 20° to 30°, thereby improving the visibility of the print and printing on paper on a desk.

In addition, in the case shown in Fig. 12, the paper feeding protrusion 1B
When using this, the direction of rotation may be reversed, or a well-known paper feeding mechanism may be used.

Fig. 14 shows details of the outer rotor pulse motor PM shown in Fig. 2, in which the permanent magnet Mg serving as the outer rotor is annular, and N poles and S poles are provided alternately. Saha 2
It corresponds to printed text. That is, for example, to make 32 characters, 8 S poles and 8 N poles are formed in a circular ring, and two pairs of comb-shaped yokes F1-F2, F1'- are installed inside.
F2' are opposed to each other so as to mesh with each other, and coils C1 and C2 are respectively wound therein.

The yokes F1-F2 are formed by a semicircular integral yoke F as shown in FIG.

Further, semicircular yokes F' having the same structure are placed opposite each other as shown in FIG. 14, and F and F' are arranged in a positional relationship with a 1/2 magnetic pole shift.

Figure 16 is a developed view of Figure 14, and when a current is passed through coil C1 in a certain direction as shown in Figure 17, F1 becomes the N pole and F2 becomes the S pole, and the N pole of the outer rotor permanent magnet and the N pole of F1 are It is repelled and attracted between the S pole of F2 and the N pole of the permanent magnet, and the S pole of the permanent magnet and the N pole of F1 are attracted.
The poles are attracted and repelled between the S pole of the permanent magnet and the S pole of F2, and as a result, the outer rotor permanent magnet moves downward in the drawing by 1/2 magnetic pole. Next, when a similar current is applied to C2, F1' becomes the S pole and F2' becomes the N pole, and as before, attractive and repulsive forces are generated between the permanent magnet and F1' and F2', and further downward in the drawing. It advances by /2 magnetic poles and then repeats this to perform intermittent rotation. If you want to move it in the opposite direction, change F1' to the N pole.
A current is passed in the opposite direction to coil C so that 2' becomes the S pole.
1, just let it flow to C2.

As described above, although the type wheel unit 10 detects the home position, it is possible to rotate the desired type so as to face the printing position simply by applying a pulse.

FIG. 18 shows an example in which the coils C1, C2, permanent magnets Mg, Mg', F1, F1', etc. shown in FIG. 14 are arranged on both sides of the type wheel, and a stronger torque can be obtained.

As described above, the printing device of the present invention has a hammer inside, and a type belt is wound around the type ring unit, and the type belt has a force transmitting portion at its end. An outer rotor type pulse motor is installed in the section, and this pulse motor directly rotates the type wheel unit, and the rollers are rotated via the type wheel unit, so transmission mechanisms such as gears, including the paper feed mechanism, are minimized as much as possible. It can be removed, making it much smaller and more compact.
Further, the rotational position of the support member can be accurately controlled by pulses applied to the motor without using a code plate or the like, and the control system is also simplified.

[Brief explanation of drawings]

Figure 1 is an embodiment of the present invention, Figures 2 and 3 are partial perspective views, Figure 4 is an example of a battery stored in an ink roller, and Figure 5 is another example of Figure 1. Figures 6, 7, 8, and 9 are drive circuit example diagrams, and Figure 10.
11 is a top view of the hammer shown in FIG. 5, FIG. 12 is another example of the hammer in FIG. 10, FIG. 13 is an explanatory diagram of its operation, and FIG. FIG. 15 is a partial perspective view, FIG. 16 is a developed view of FIG. 14, FIG. 17 is a drive waveform diagram, and FIG.
The figure is another example diagram of FIG. 16. 4...Hammer, 10...Type wheel unit,
PM……Outer rotor pulse motor, DB
...Battery, LC1 to LC3...Numeric display.

Claims (1)

[Claims] 1. A cylindrical support member having a plurality of holes around the periphery, a plurality of protrusions on the back surface, a plurality of letters corresponding to each protrusion on the front surface, and each protrusion fitted into the hole of the support member. A type wheel unit consisting of a type belt wrapped around a supporting member and having a protruding force transmitting portion at the end of the type belt in the missing portion of the type, and a method for applying ink to the type while avoiding the force transmitting portion of the type wheel unit. an ink roller arranged therein, a hammer which is housed inside the type wheel unit and which hits a protrusion of the type belt to project the type corresponding to the protrusion from the support member toward the printing paper; and the type wheel. an outer rotor type pulse motor which is disposed on the rotation axis of the unit and at the end of the type wheel unit, and whose rotor is fixed to the support member so as to rotate integrally therewith; and a protruding force transmitting motor of the type wheel unit. The type wheel unit is directly rotated by the outer rotor type pulse motor, and each time the type wheel unit rotates once, the protruding force transmitting portion is applied to the pinch roller. A printing device characterized in that paper is fed only while engaged.