JPS6221633B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to an electronic device equipped with a printing device, and in particular a step motor for driving a printing head in forward and reverse directions can also be used for paper feeding. , relates to an electronic device that can continuously feed paper according to continuous paper feed instructions.

[Prior Art] There has been a desire for small, low-cost, and highly functional electronic devices.

[Purpose] The present invention is a device capable of moving a print head in forward and reverse directions, in which the step motor for driving the print head can also be used for paper feeding, and in addition, the step motor for driving the print head can also be used for paper feed. The purpose is to provide an electronic device that can continuously feed paper according to instructions.

An object of the present invention is to provide an electronic device having a print head that moves along the width direction of a printing machine, with a first key that instructs generation of a carriage return signal and a second key that instructs feeding of printing paper. a step motor for moving at least the print head in the forward and reverse directions, a counter section for rotationally driving the step motor, and the step motor is rotatable in the forward and reverse directions; a direction indicating section that indicates a direction; an excitation section that excites the step motor based on a signal from the counter section; and when an instruction is received from the first key or the second key, a signal generating section that generates a control signal so that the step motor is also used for paper feeding; and a signal generating section that generates a control signal based on continuous instructions from the second key, the counter section, and the direction indicating section. An object of the present invention is to provide an electronic device in which the step motor is driven by the excitation section to continuously feed paper.

[Example] An example of the present invention will be described in detail below with reference to the drawings.

Figures 1 to 5 show the drive mechanism in one embodiment of the present invention, and 1 indicates operations such as advancing and reversing the print head, advancing one line of print paper as a recording medium, and changing the print posture of the head. In this embodiment, a reversible step motor (pulse motor) is used as a driving means for performing the above operations using a single driving source.

The stator side of the step motor 1 is fixed to the middle plate 2, and its rotating shaft 3 is engaged with a gear 6 of a winding shaft 5. The winding shaft 5 is rotatably supported by a shaft 42 on the left side plate 4, and is driven to rotate intermittently by the rotating shaft 3. In addition, a wire 8 whose starting end and ending end are fixed is wound around the winding shaft 5 and can be freely unwound.
By winding and unwinding the wire 8, the intermittent rotational motion of the step motor 1 is converted into intermittent linear motion. A carriage (head holder) 10 in which a print head 9 is provided is attached to the wire 8 which makes intermittent linear motion. The attachment portion 11 between the wire 8 and the carriage 10 is held by various means such as screws, bent protrusions, and eyelets. The wire 8 whose starting and ending ends are fixed to the winding shaft 5 has an endless configuration, and a carriage 10 held at an appropriate position in the middle moves intermittently to print on the printing paper. In addition, the wire 8 is connected to rollers 12, 13, 1 so as to surround the main body of the printing device.
4, 15, etc., so as to be able to travel, the whole structure is made compact. Carriage 1
0 is held on the carriage support shaft 17 at an angle appropriate for printing and is held slidably in the axial direction in order to maintain the printing posture of the printing head 9 and printing paper 16. In this embodiment, a sliding member 20 made of plastic or the like is provided inside the carriage in order to provide sliding properties between the support shaft 17 and the carriage 10. The support shaft 17 is rotatably supported between the right side plate 21 and the middle side plate 2 at axial points 18 and 19, and one end of a dogleg-shaped lever 22 is set at the axial point 18 of the support shaft 17. A rotational force is applied to the support shaft 17 toward the printing paper side by the spring 25 pulling the support shaft 17, and the carriage 10 and print head 9 supported by the shaft 17 are pressed against the printing paper 16 and pad 58.

The other end of the spring 25 is fixed to a support rod 26 for supporting the middle side plate 2 and the left side plate 4. The left side plate 4 has a support shaft 42 for the winding shaft 5 and a roller 1.
2, 13, etc. are supported rotatably, and as will be described later, a switch 27 for detecting the end of reverse movement of the print head 9, a support shaft 39 of the paper feed lever 30, stopper pins 40 and 41 of the lever 30, etc. It is provided. One end 33 of the paper feed lever 30 is rotatably supported by a support shaft 39 fixed to the left side plate 4, and is biased downward by a coil spring 38 wound around the shaft 39 and stopped by a stopper pin 40. There is.

A paper feed pawl 46 is rotatably supported by a shaft 31 at the other end 32 of the lever 30, which is on the same plane as the one end 33. The projection position detection member 34 of the winding shaft 5, which is integral with the paper feed lever 30 and bent perpendicular to the surface of the lever 30, is pushed upward by the projection 7 provided on the winding shaft 5, and the contact piece 28 of the switch 27, 29 is contacted just before reaching the stopper pin 41, and the switch 27 notifies the control section 70 of FIG. 10, which will be described later, that the print head has reached the reverse end position.

The protrusion position detection member 34 has stoppers 40, 4.
Buffer members 35 and 36 for muffling the impact noise caused by the switch 1 and push-up members 37 made of an insulating material for bringing the contact pieces 28 and 29 of the switch into contact are provided. A paper feed pawl 46 rotatably supported on the paper feed lever 30 is moved to a pawl wheel 48 by a spring 45.
It is crimped to the claws 49, 50, etc. The pawl wheel 48 is fixed to the rotating shaft 51 of the paper feed roller 53, and the printed paper is fed one line with each pawl. The printed paper 16 is held between a paper feed roller 53 and a pressure roller 54. The pressure roller 54 is a part 62 of the guide member 60 for the printing paper 16.
Supported by The member 62 has a notch made in the middle of the member 60 near 61, and the natural elastic force of the member 60 presses the roller 53 to obtain a uniform pressure. Opposite platen (pattern) 5 of print head 9
8 is a support plate 5 made of a highly elastic material such as rubber.
Supported by 5. Reference numeral 59 denotes an intervening member, and in this embodiment, it is made of a film made of heat-resistant material such as Teflon and has a small coefficient of friction, and is fixed to one end 57 of the support plate 55, and is coated on the pad 58 without adhesion. , is stretched with an appropriate tension near the other end 56, and then fixed with an adhesive tape or the like.

In conventional parts, the membrane 59 was attached directly to the part 58, so it was prone to expansion and contraction due to changes in room temperature and humidity.
Frictional heat caused by the movement of the printing head and expansion and contraction caused by mechanical displacement caused wrinkles and distortions on the surface of the book membrane, making it impossible to maintain uniform contact between the printing head and the printing paper. Further, when inserting the printed paper, the horizontal end surface of the printed paper sometimes collides with the pad, causing inconvenience in loading. However, according to the printing device according to the present invention, as described above, the pad 58 and the book membrane 59 are brought into light contact with each other, but are not bonded together, and the printing paper is guided near the support plate 55, so the above-mentioned drawbacks are completely eliminated. I was able to do that.

As the printing head of a printing device having the above-mentioned pad, a thermal head is suitable, which performs printing by selectively energizing dot elements or segment elements to generate heat and cause a chemical change in the thermal paper.

An embodiment of the present invention will be described below using an example using a thermal head, but the present invention is not limited to a thermal head. FIG. 6 shows an example of a thermal head. 65 is a semiconductor substrate such as silicon,
A predetermined number of heating elements 66 each having a built-in resistor are formed on the substrate, and selected elements generate heat when energized to print letters, numbers, etc. on the thermal paper.

64 is a ceramic holding silicon 65 to diffuse the heat of the heat generating element 66, and a heat sink 9' made of aluminum or the like to dissipate the heat.

Reference numeral 67 denotes a lead wire made of a flexible wiring material and forming a current conduction path for selectively energizing the heating element 66. This lead wire 67 is inputted from a printing section 69 to a control section 70 and connected to a character generator 82, as shown in FIG. The step motor 1 has a four-phase configuration and performs intermittent motion for one rotation using four pulses. The driving pulse generator 71 generates sequential pulses ₀ , ₁ ,
When ₂ and ₃ occur, the rotor of motor 1 becomes
A ₃ L→A ₀ L, A ₀ L→A ₁ L, A ₁ L→A ₂ L, A ₂ L→A ₃ L
The coil position rotates intermittently every 90 degrees. With this intermittent rotation of 90 degrees, the wire 8 is wound around the winding shaft 5 by one character to be printed, and the carriage 10 is sent in the direction of the printing line by one character to print. And conversely _{, 3} , ₂ ,
When pulses are generated in the order of ₁ and ₀ , the rotor of motor 1 changes from A ₀ L to A ₃ L, A ₃ L to A ₂ L, A ₂ L to A ₁ L,
A ₁ L → A ₀ L, the carriage rotates in the opposite direction, and the carriage 10
will return. Further, the rotor of the motor 1 is set so as to stand still at the coil A ₀ L position when the carriage 10 is stopped at the printing start position.

An embodiment of the drive control means for driving the motor 1 is shown in FIGS. 11 and 12.

In the figure, 83 is an inverter that inverts the print head return command (carriage return CR) signal from the calculation unit or calculation control unit of the computer, and 84 is the calculation result calculation command signal from the external control device of the computer, such as the keyboard. KF is a NAND logic gate to which an output signal of a NAND gate 99 (described later) and a set output SIG of a flip-flop 96 (described later) are applied; 85 is a paper feed command signal PFE from the keyboard and a set output SIG of the flip-flop 96 86 is a NAND logic gate to which is applied, and 86 is an inverter 8
3. A NAND logic gate receiving the outputs of the NAND logic gates 84 and 85. A NAND logic gate is a gate whose output becomes high level when at least one of its inputs is low level in positive logic. (The following explanations are all based on positive logic) 87
is a flip-flop and the NAND logic gate 86
A reverse signal is set in synchronization with the falling edge of the clock pulse CP to rotate the step motor 1 in the reverse direction and move the carriage 10 backward.
BACK (J side output of flip-flop 87 is high level) is generated. As is clear from FIG. 11, the K side of the flip-flop 87 is always in a reset state, so when the output from the NAND logic gate 86 is at a low level (J=0), the output terminal on the J side is at a low level. The output terminal on the K side becomes a high level, causing the step motor 1 to rotate forward, and a step signal FORW to move the carriage 10 forward.
is being generated. NAND logic gate 88 is
A NAND logic gate 89 for synchronizing the BACK signal with the next clock signal is a gate for outputting the FORW signal to a subsequent stage in response to a print command signal PRINT or the like.

90 is a NAND logic gate that receives the outputs of the NAND logic gates 88 and 89;

Reference numeral 91 is a flip-flop which is inverted by the fall of the output of the NAND logic gate 90 and constitutes the first stage of the quaternary counter, and is normally reset.

92 and 93 are the set signal T ₁ of the flip-flop 91, the reset signal ₁ and the FORW and
NAND logic gate opened and closed by BACK signal, 9
4 is a NAND logic gate that receives the outputs of the NAND logic gates 92 and 93; 95 receives the output of the gate 94 at its set and reset input terminals, and inverts it in synchronization with the fall of the output of the gate 90 and the simultaneous fall of the output of the NAND logic gate 94, and constitutes the latter stage of the quaternary counter. It is a flip-flop that always resets. 9
6 is FORW and RESET input terminal respectively.
These flip-flops receive the BACK signal and are inverted in synchronization with the fall of the set output _T2 of the flip-flop 95, and are normally reset. When the set output SIG of the flip-flop 96 is being generated, the print head is in the process of printing on the print paper, and information from the character generator 82 is applied to the print head 9 through the lead wire 67, allowing it to print. It's getting old.

When the reset output SIG signal is being generated, the head 9 is moving backwards by the clock pulse CP, and the head is returning incrementally from the head return end position to the print start position, and printing is not possible during this time. Don't do it. nand logic gate 97
receives the _T2 signal and the output of gate 94 and applies its NAND logic output to the input terminal of flip-flop 98. Flip-flop 98, like flip-flop 87, always has a reset output _{of 3.}
maintains a high level, and its output is input to NAND gate 99. 99 is the reset output of each of the flip-flops 91, 95, and 98.
This is a NAND logic gate for receiving signals ₁ , ₂ , and ₃ and outputting signals. 100 is print signal
an inverter for inverting PRINT; 101 is a NAND logic gate to which the signal and CP signal are applied; 1
02 is a NAND logic gate that receives the output of the inverter 100 and the output of the NAND logic gate 101. 103 is a calculation result calculation command key, 104 is a flip-flop that is set by a signal from the calculation result calculation command key and reset by a signal from the calculation control section 106, which will be described later, and 105 is a set output signal of the flip-flop 104 =KF. and an AND logic gate which receives an inverted signal o of the output signal of the NAND gate 99.

An AND logic gate is a gate whose output is at a high level when all of its inputs are at a high level. 106 is an arithmetic control unit that controls the arithmetic operations of the arithmetic unit; 107 is a function key that instructs to control devices such as +, -, ÷, It also outputs the command to do. 108 is a one-shot multivibrator, and 109 is an OR logic gate. An OR logic gate is a gate whose output is high when at least one of its inputs is high. 110 is a one-shot multivibrator.

Numerical keys 111 generate a numerical signal N.

The drive control circuit having the above configuration is a practical circuit configuration that is convenient for use when embodied as a chip such as an IC or LSI.

However, for the sake of simplicity, the following operation will be explained using the circuit shown in FIG. 13, which is a simplified version of the circuit configuration shown in FIG. 11. FIG. 13 shows a circuit configuration completely equivalent to FIG. 11. That is, FIG. 13 shows a modification of the circuit configuration of FIG. 11 using de Morgan's law a×b=a+b. In this case, it goes without saying that some changes will be required in FIG. 12, and the inverters 83 and 100 will be unnecessary. Components in FIG. 13 that are the same as those in FIG. 11 are designated by the same reference numerals. 112, 11
3,115,116,118,119 and 122
is Ungate, 114, 117, 120, 121
and 123 is an or gate. Figure 14 is the first
3 (FIG. 11) and the input/output signal waveforms of each element in FIG. 12 are shown.

Next, the specific operation of the printing apparatus of the present invention having the above-mentioned configuration will be explained below using the numerical value 123,456+ as an example. As shown in FIG. 9, the print head 9 on the carriage 10 is positioned at the print start position A ₀ on the print paper 16.
Assume that it is stationary at . Here, when the number 1 is entered from the keyboard's number key NK111,
Numerical information is stored in a storage device such as a register in character generator 82 of FIG. 10 and sent to print head 9 via lead 67. Further, this key signal is converted into a PRINT signal by the arithmetic control section 106 as shown in FIG. 12, and the print head 9 prints "1" at the print start position _A0 . On the other hand, the PRINT signal opens the OR gate 123 and the AND gate 11.
6. At this time, flip-flop 87
is from switch 27 in the state before the printing device.
The END signal is applied to the clear input terminal for resetting, and the FORW high level signal is applied to the AND gate 116. Therefore, AND gate 116 is opened, OR gate 117 is opened, and a high level signal is applied to flip-flops 91 and 95. However, since the flip-flops 91 and 95 are flip-flops that are inverted in synchronization with the falling edge of the signal, their states do not change and remain reset. Next, when the PRINT signal becomes low level, the OR gate 123 closes, and therefore the AND gate 11
Since the AND gate 115 cannot be opened, the OR gate 117 is also closed, and a low level signal is applied to the flip-flops 91 and 95.
Therefore, the flip-flop 91 is inverted and the set output is
_T1 signal is output. Therefore, AND gate 118 is opened, OR gate 120 is also opened, and a high level signal is applied to another input terminal of flip-flop 95. At this time, since the input signals to the flip-flop 95 do not match the synchronization, the flip-flop 95 does not invert its state. Therefore the first PRINT
The contents of the counter at the falling edge of the signal are T ₁ ,
When ₂ is at a high level, 1 is counted and inputted to the drive pulse generator 71 shown in FIG. 10, the AND gate 75 is opened, and pulse ₁ is applied to the coil _A1L of the step motor 1 to excite it. Therefore, the rotor (not shown), which was stationary at the coil A ₀ L position, rotates 90 degrees and comes to rest at the A ₁ L position. When the shaft 3 of the step motor 1 rotates 90 degrees, the winding shaft 5 shown in FIG. 1 rotates by a certain angle and winds the wire 8 by one character length. As a result, the print head 9 on the carriage 10 loaded on the wire 8 moves from the print start position _A0 to the next print position _A1 in the lateral direction by one digit. Next, when the numeric value 2 is input from the numeric key 111, "2" is printed, the OR gate 123 opens, and the AND gate 116 opens.
Therefore, OR gate 117 opens and a high level signal is applied to flip-flops 91 and 95. At this time, the flip-flop is not reversed and T ₁ ,
₂ remains at a high level. then
When the PRINT signal goes low, OR gate 123 closes, AND gate 116 closes, and therefore OR gate 117 closes and flip-flop 9 is closed.
A low level signal is applied to 1 and 95. Therefore, the flip-flop 91 is inverted and the reset output is
₁ signal appears. At this time, since the BACK signal is not applied, AND gate 119 does not open, and AND gate 118 cannot open, so OR gate 1
I can't even open 20. Therefore, the low level signal and the above low level signal are applied to the flip-flop 95, that is, the input signals fall at the same time, so the flip-flop 95 is inverted and the set output is
T ₂ signal appears. Therefore, the contents of the counter are ₁ ,
T ₂ becomes high level, counts 2, and pulse ₂ is generated by the AND gate 74. pulse
₂ advances the step motor further 90 degrees and moves to the third digit printing position _A2 . Furthermore, when the number 3 is entered from the keyboard, the same steps as above are performed.
Printing at high level of PRINT signal, printing at low level of PRINT signal
₃ occurs, and the carriage 10 is fed by intermittent rotation of the step motor.

Thereafter, printing and head feeding are performed in order up to the number 6 in the same manner. Next, the facsion key FK10
When the + key 7 is pressed, the signal is input to the arithmetic control unit 106 in the same way as a numerical value, and a + sign is printed.
Further, this key signal is delayed for a predetermined time by the one shot multi vibrator OS ₁ , and further activates the one shot multi vibrator OS ₂ . The output of this _OS2 becomes the carriage return signal CR shown in FIG. 14, and the set side input terminal of the flip-flop 87 becomes high level. The flip-flop 87 whose set side input terminal has become high level is set in synchronization with the fall of the clock pulse CP applied to the synchronization input terminal, and applies a BACK signal to the AND gate 115. At the same time, the reset output FORW signal becomes low level and the AND gate 116 is closed.

AND gate 115 causes clock pulse CP to be input to flip-flop 91 via OR gate 117. Also, the AND gate 118 closes,
119 opens. Therefore, when the print head returns, the counter counts the falling edge of the clock pulse in a subtractive manner, and if this is decoded, ₃ → ₂ → ₁
→ A sequential pulse of ₀ is generated from 71, and the step motor 1 begins to rotate in reverse intermittently. Since the clock pulse CP has a much higher frequency than the PRINT signal, the wire 8 is rewound onto the winding shaft 5 at high speed and almost continuously, and the carriage 10 is quickly reversed. Here, Kimaritsuji 10 is the initial printing start position
It passes _A0 and moves further in reverse until it reaches the final position where switch 27 is closed. When the carriage 10 is at rest at the printing start position, the protrusion 7 of the winding shaft 5 and the protrusion position detection member 34 are in the position shown by the solid line in FIG. Also, one end 23 of the dogleg-shaped lever 22
is open and the other end 24 is tensioned by a spring 25, so that the head 9 on the carriage 10 presses the pad 58 through the printing paper 16. Further, the detection member 34 is biased downward by a coil spring 38 and further stopped by a stopper pin 40, and is located at the lowermost end at the bent portion 47 of the paper feed pawl 46.
is engaged with the pawl 49 of the ratchet wheel 48. At this point, the printing head 9 is energized with numerical information as described above, and after one character is printed, the shaft 3 of the step motor 1 is rotated to 90°.
The winding shaft 5 is rotated to the left by a certain angle to wind the wire 8 by a certain amount, so that the printing head 9 on the carriage 10 is moved to the right by one digit. In this way, as the step motor 1 rotates intermittently to the right, the winding shaft 5 rotates intermittently to the left to feed the head, and when the position of the protrusion 7 rotates to the maximum angle in the range B, the maximum number of printed digits is achieved. is set to . When the printing head 9 is being fed in the printing direction, the movable parts are extremely simply comprised of only the winding shaft 5, the wire 8, and the carriage 10, as described above.

Next, a carriage return signal CR is generated by the function signal + from the function key 107, and when the contents of the counter are counted in the subtractive direction, the shaft of the step motor 1 begins to rotate counterclockwise, causing the carriage 10 to move backward. It is done. For this operation, it is sufficient to simply rotate the sputter motor 1 in the reverse direction and completely reverse the printing case. That is, even when the carriage 10 moves in reverse, the tension of the spring 25 is applied to the other end 24 of the lever 22, so that the pressing force to the pad 58 continues to be applied in the same way as in the case of printing. With this configuration, an automatic head cleaning effect can be expected in the case of a thermal printer in which the printing head 9 on the carriage 10 is a thermal head and the printing paper 16 is thermal paper. In other words, in a mechanism in which the thermal head 9 prints while pressing the thermal paper at high temperatures, it is inevitable that paper fibers, combustion debris, physicochemical deposits, etc. will adhere to the head during printing. Traditional thermal printers sometimes require the operator to clean the head using specialized cleaning means. In order to overcome the above-mentioned drawbacks, the printing device of the present invention is constructed so that impurities adhering to the head during printing can be wiped away by using the pressure applied to the pad when the head returns. . When the printing head is returned while being pressed in this manner and moved backward to the printing start position _A0 , the state before printing returns and the protrusion 7 of the winding shaft 5 returns to the position indicated by the solid line in FIG. 2. The counter now counts several more clock pulses and continues to move the carriage 10 backwards.

In this embodiment, the positional relationship of the heads is set so that, for example, four clocks are counted after reaching _A0 . That is, while the printing head 9 moves backward to the position _-A0 as shown in FIG. 9, the protrusion 7 of the winding shaft 5 rotates clockwise through the range A in FIG. The protrusion position detection member 34 engaged with the protrusion 7 is gradually pushed upward until the buffer member 36 provided on the member 34 hits the stopper pin 41. Further, the contact piece pushing up member 37 provided on the member 34 closes the contact pieces 28 and 29 of the switch, and notifies the control section 70 through the lead wire 44 that the head 9 has reached the terminal position. This signal serves as an END signal and resets the flip-flops 87, 96, and 98 in the drive control means to generate FORW, . . . ₃ signals, respectively, and switch the counters. During the same time period, when the projection 7 brings the detection member 34 to a substantially horizontal position, the horizontal upper surface of the member 34 contacts and engages one end 23 of the lever 22, and further pushes up the one end 23 against the tension of the spring 25. . Since the lever 22 is fixed to the axis point 18 of the support shaft 17, the shaft 17 rotates clockwise as the lever 22 rotates. Axis 17
As mentioned above, the carriage 10 is moved by the sliding member 20.
Since the printing head 9 is slidably supported, the printing head 9 is released from the printing paper 16 as the shaft 17 rotates clockwise, and is released to the maximum extent when the detection member 34 is stopped by the stopper pin 41. Furthermore, during this same time, the paper feed lever 30, which is formed by vertically bending the horizontal surface of the member 34, is also pushed up together with the member 34 by the rotation of the projection 7. This pushing up force is sufficient to resist the downward urging force of the lever 30 by the coil spring 38. Fulcrum 3 of one end 32 of paper feed lever 30
Paper feed claw 4 rotatably supported and suspended at 1
The bent portion 47 of No. 6 engages the pawl 49 of the ratchet wheel 48 when lifted by the left rotational force of the lever 30.
Rotate 8 to the left. Therefore, the shaft 51 integrally formed with the ratchet wheel 48 also rotates to the left, and the paper feed roller 53 connected to the shaft 51 rotates to gradually feed the paper. As mentioned above, the member 34 is the stopper pin 41.
When it hits, the paper feed reaches its maximum height and stops. At this time, just before the member 34 reaches the pin 41, the push-up member 37 closes the switch 27, and the counter in the drive control means is set to the FORW side for incrementally calculating the clock pulse CP. That is, the reset output signal of flip-flop 96 and the clock pulse CP open AND gate 122 and also open OR gate 123, so that it is already applied to AND gate 116.
The FORW signal and the output signal of the OR gate 123 open the AND gate 116 and the counter begins counting incrementally, similar to the PRINT signal. Therefore, the step motor 1 again starts to rotate intermittently to the right, the winding shaft 5 also rotates to the left again, and the projection 7 starts to descend from the maximum point of the range A. When the protrusion 7 begins to descend, the member 34 is tilted downward by the coil spring 38 and stopped by the stopper pin 40, returning to the initial state. The paper feed pawl 46 of the paper feed lever 30 also moves downward, and the bent portion 47 of the pawl 46 slides along the longitudinal slope of the pawl 50 due to the force of the spring 45, and finally engages with the bent portion 47 and comes to a rest, and the next paper is moved. Set the feed. The lever 22 is also returned to its original state by the spring 25, and the printing head 9 is pressed onto the pad 58 via the printing paper 16. Printing start position of head 9
The number of stepping pulses to A ₀ is 4, and from the A ₀ position -A ₀
The number is the same as the number of pulses to reach the position. This means that the counter in the drive control circuit accurately converts the clock pulses into four clock pulses.
By counting only the number of shots and then stopping. As is clear from the waveform diagram in FIG. 14, the flip-flop 87 is set during the high level time of the signal.
From the first fall of the set output _T2 of the flip-flop 95 after the BACK signal is generated to the first fall of _T2 after the reset output FORW signal of the flip-flop 87 is generated by the signal of the switch 27. It can be specified as appropriate. With this configuration, the counter counts exactly 4 clock pulses CP, continues to memorize this, and moves the print head 9 to the printing start position.
It can be stopped at A ₀ . In this manner, the printing apparatus of the present invention is capable of stopping the print head 9 at the printing start position very accurately.

The printing head is not limited to the thermal head as described above, but can be applied to many other types such as discharge printing needle heads, wire matrix heads, ball type heads, electric field printing heads, and inkjet type heads. Furthermore, if the structure of the printing head (for example, a thermal head) is changed to an example in which a notch 68 is provided as shown in FIG. 7, the printing posture changing mechanism of the head can be omitted from the embodiments shown in FIGS. 1 to 5. be.

Further, in the printing apparatus of the present invention, since the print head 9 moves to a position away from the print start position, it is possible to provide special means for cleaning the print head, heat dissipation promoting means, etc., an example of which is shown in FIG. Print head 9
In the case of a thermal head having a heat generating element 66, a means for cleaning the heat generating element 66 (for example, felt containing silicone oil, monoethyl diphenyl, diethyl diphenyl, etc.) is provided on the middle side plate 2. A cleaning effect on the printing head 9 can be expected. In other words, the print head 9 moves backward to the left from the print start position, and further moves the print head 9 to the position where it leaves the printing paper 16.
When the heat generating element 66 moves, it comes into contact with the cleaning means 52, and is further moved backward while contacting and engaging with the cleaning means 52, thereby cleaning the heat generating element 66. This cleaning means is particularly effective when the heating element 66 is easily soiled, such as in a thermal head.

Furthermore, the present invention is most suitable for printing heads that are heavily soiled, such as other electric field printing heads and inkjet heads. In this case, cleaning means suitable for each print head may be provided on the middle plate 2, and the cleaning action may be performed when the heating element 66 comes outside the printing paper. In the case of the example shown in FIG. 8, the print head having the notch 68 shown in FIG. can be done. Therefore, it is convenient that the pressure force of the print head 9 against the print paper 16 can be used as is. In this case, the paper is fed using the gap in the notch 68 as described above. However, in the case of the example shown in FIG. 1, the printing posture of the head is changed and the paper is fed, so in this case the cleaning means may be provided at a location depending on the posture of the head.
Furthermore, if the printing head 9 is brought into light contact with the cleaning means 52 intermittently by utilizing the reciprocating movement of changing the posture and position, a remarkable cleaning effect can be expected depending on the type of head. Furthermore, for heads such as thermal heads whose printing portions are subject to high temperatures, a cooling effect can be expected from this cleaning means, and heat dissipation by conduction is promoted. Furthermore, if heat dissipation promoting means made of a good thermal conductor such as aluminum is provided at 52, in the case of a thermal head, the heat dissipation effect can be further promoted, and the durability and lifespan can be favorably affected. In addition, when it is necessary to feed paper continuously in the printing apparatus of the present invention, if the paper feed key (not shown) is held down, the AND gate 113 will open and close intermittently intermittently, allowing the desired number of lines to be fed. You can feed the paper in minutes. In other words, head 9 is the printing start position.
One line of paper is fed while reversing from A ₀ to -A ₀ , so if you AND the PFE signal from the paper feed key and the SIG signal, you can feed one line of paper with the same operation as the CR signal described above. will be held. If you continue to hold down the paper feed key, this cycle repeats and you can send as many lines as you like. In this way, by operating the printing paper feeding mechanism provided in the mechanical sequence even when the paper feed key is operated, a special feeding motor, plunger, etc. can be omitted, which is the most distinctive feature of the present invention. This is the place to do it.

Furthermore, another feature of the present printing device is that in the printing format on the printing paper 16, only the equal sign = is always printed at the leftmost print opening position A ₀ , so that a very favorable effect can be obtained in terms of arrangement. be.
In other words, the calculation result calculation command key 103 in FIG.
When is pressed down, the flip-flop 104 is set and an operation result calculation command signal is sent to the AND gate 112 (NAND gate 84) and AND gate 105.
KF is applied. When the print head 9 is located at a location other than the print start position _A0 , that is, during the stepwise printing process, both the SIG signal and the output signal of the off gate 121 are at a high level. Accordingly, the AND gate 112 opens, and in order to bring the head to the print start position in the same manner as described above, the counter switches to subtraction, moves backward, and then switches forward and stops at the print start position _A0 .

In this way, the print head 9 moves to the printing start position.
When stopped at A ₀ , the flip-flop 104 remains set, and the output signal of the OR gate 121 becomes low level, and conversely, the signal 0 becomes high level. The set output of 104=KF signal is input. Therefore, in the same way as the numerical key action key signal, the calculation control unit 106 prints a calculation result display symbol, for example, an equal sign = at the print start position _A0 , and further calculation results, etc. are printed successively. The arithmetic control unit 106 also generates a detection signal for the number of effective print digits in a register (not shown) or the end of one register word length, and applies it to the OR gate 109 to activate the one-shot multi 110 and output the carriage return signal CR. to occur. At the same time, the sense signal resets flip-flop 104. Therefore, the print head 9 is again brought to the print start position _A0 and stopped to prepare for the next print.
As mentioned above, on the printing paper 16, as shown in Fig. 9, ordinary arithmetic symbols ×, ÷, +, -, etc. are printed in the next digit of the numbering process, and arithmetic result display symbols, such as the equal sign =, are always printed. Since it is configured so that the result number is printed at the position and the result number is printed after the next digit, it is possible to obtain a printing format that is extremely easy to read.

As described above, the printing device of the present invention has a simple configuration and has many effects by moving the print head further than the printing start position of the printing paper, and also by detecting the end position of the print head that has been moved further. Since the drive control means is energized and the print head is driven to the print start position _A0 with a small drive signal, the print start position of the head can be ensured extremely accurately, and the disadvantage of uneven print start positions can be avoided. This was something that could be resolved. Further, in this case, it is only necessary to move the printing head 9 at least to a position where it deviates from the printing start position, and it is not necessarily necessary to move it until it deviates from the printing paper 16.

[Effects] As detailed above, according to the present invention, the print head can be moved in forward and reverse directions, and the step motor for moving the print head can also be used for paper feeding. In addition, it is possible to provide an electronic device that can continuously feed paper by continuously instructing the paper feed.
In electronic equipment with a moving print head,
a first key for instructing generation of a carriage return signal; a second key for instructing feeding of printed paper;
At least a step motor for moving the print head in forward and reverse directions, a counter section for rotationally driving the step motor, and a counter section for rotationally driving the step motor; a direction indicating section; an excitation section that excites the step motor based on a signal from the counter section; and an excitation section that excites the step motor when an instruction is given from the first key or the second key. A signal generating section that generates a control signal to be used also for paper feeding, and based on continuous instructions from the second key, the signal generating section, the counter section, the direction indicating section, and the excitation section. It has now become possible to provide an electronic device that continuously feeds paper by driving the step motor.

According to the present invention, it has become possible to provide a compact, low-cost, highly functional electronic device that has a paper feeding function.

[Brief explanation of the drawing]

FIG. 1 is an embodiment of a printing device according to the present invention, FIG. 2 is a cross-sectional view taken along line A-A' of the device shown in FIG. 1, FIG. 3 is a cross-sectional view taken along line B-B', and FIG. 1 is a diagram showing the paper feeding section of the device, FIG. 5 is a sectional view of the print head shown in FIG. , FIG. 7 shows another embodiment of the print head, FIG. 8 shows still another embodiment of the present invention using the print head of FIG. 7, and FIG. 9 shows a print head in a printing device according to the present invention. Diagram representing the movement principle of , No. 10
11 is a diagram showing the combination of the printing section and the control section of the printing device of the present invention, FIG. 12 is a diagram showing another part of the control section in FIG. 10, FIG. 13 is a diagram showing a circuit equivalent to that in FIG. 11, and is a diagram for explaining the operation of the counter component, and FIG. 13 and 12 are shown respectively. In the drawings, 1... reversible step motor, 8
... wire, 9 ... print head, 16 ... print paper, 25 ... spring, 27 ... switch, 4
4...Lead wire, 52...Cleaning means or heat dissipation promoting means, 58...Elastic member, 59...Thin film, 71
... Drive pulse generator, 82 ... Character generator, 8
7, 91, 95, 96, 98, 104... flip-flop, 106... arithmetic control unit.

Claims (1)

[Scope of Claims] 1. In an electronic device having a print head that moves along the width direction of printing paper, a first head that instructs generation of a carriage return signal;
a second key for instructing the feeding of printing paper; a step motor for moving at least the print head in the forward and reverse directions; a counter section for rotationally driving the step motor; and the step motor. is rotatable in forward and reverse directions, and includes a direction indicating section that indicates the direction of rotation; an excitation section that excites the step motor based on a signal from the counter section; and the first key or a signal generating section that generates a control signal to use the step motor also for paper feeding when an instruction is received from the second key; An electronic device characterized in that the step motor is driven by a counter section, the direction indicating section, and the excitation section to continuously feed paper.