JPS589598A - Recording device - Google Patents

Abstract

PURPOSE:To move a recording head accurately at a small pitch in an outgoing path and to return the recording head to the original position at a high speed by driving a pulse motor by a one phase and two phase excitation method. CONSTITUTION:A control circuit 7 controls the operation of the recording head and the pulse motor 2 in accordance with the instruction from an input means 8. The control circuit 7 comprises a CPU, an ROM, an RAM, and PIO. In the ROM, control programs and character pattern generating codes are stored. The control circuit 7 imparts forward rotation pulses and reverse rotation pulses to a pulse motor driving circuit 13 in order to control the pulse motor 2. The driving circuit 13 rotates the pulse motor 3 in the forward or reverse direction by every one step at every time it receives the forward rotation pulses or the reverse rotation pulses by the one phase and two phase excitation method.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording apparatus that reciprocates a recording head along a recording line by the driving force of a pulse motor and performs recording on recording paper during the forward movement.

It is clear from the following description that the present invention is preferably applied not only to such a thermal character printing device, but also to other recording devices such as a facsimile, although the present invention is preferably a serial thermal prescriptor. .

As described above, when moving a recording head consisting of one vertical row of recording dots using a pulse motor, it is necessary to reduce the head feed amount, that is, the step rotation angle of the motor. For this reason, pulse motors are driven in a 1-phase to 2-phase excitation format, but this excitation format cuts the excitation state and
It takes a long time to return the carriage, and therefore it is not suitable for high-speed carriage return of a recording head.

The present invention has been made in view of the above points, and will be described below with reference to Examples.

Figure 4s1 shows the recording head (1) in the recording apparatus of this embodiment.
and pulse motor (2). 1. The recording head +11 is locked to the drive wire (5) stretched between the gooley f3+ and L41,
By rotating the pulse smoke (2) directly connected to the , it moves forward along the line (horizontal direction in the figure), and by rotating it in the reverse direction, it moves backward.

FIG. 2 shows the recording surface of the recording head (1), on which seven heat-generating recording drums (6a) to (6g) are arranged in a vertical row.
are arranged. Therefore, by moving the cutting head (1) along the recording line by 5 pitches and selectively generating heat in each dot (6a) to (6g) at each pitch, 7 rows and 5 lines per character are printed on the heat-sensitive recording paper. A character consisting of a matrix of columns of dots will be printed.

FIG. 6 shows the character pattern obtained in this manner. The above recording head (f+) is waiting at the normal PO pitch position, and when printing one character starts, it moves through each pitch position of PI, P2...P5 by rotating the pulse motor (2) in 6 steps and reaches the final position. The next PO pitch position is reached. Recording drum) (6a) to (6g) generates heat in synchronization with passage of each pitch position of P1 to P5, and therefore one character pattern Ir1
Occurs within the Pl-P5 pitch position region.

As described above, the recording head (1) executes printing one character at a time during the forward movement along the recording line, and returns from the final digit position of the recording line or the intermediate printing digit position to the initial position at the left end of the recording line, i.e. Carriage return.

FIG. 4 shows an electrical circuit diagram of the recording device. Control circuit (
7) operates the recording head f according to instructions from the input means (8).
1) and the operation of the pulse motor (2). Such a control circuit (7) includes CPU, ROM, RAM and PIO.
(parallel input/output), and a control program and character pattern generation code are stored in its ROM. The input means (8) are key potato input devices and/or online input devices.

A control circuit (7) generates a print signal HT and character signals D1 to D7 to control the operation of the recording head (l).

Figure 5 shows recording head +1 controlled by these signals.
1 shows the peripheral circuit of No. 1. The recording head ill includes a heat generating resistor (9a) constituting the recording driver 1-(6a) to (6g).
~(9g) is provided. One end of each resistor is connected in common and connected to the DC power supply terminal (■l) via the switch part (lO), while the other end of each resistor is connected to the switch transistor (1
2a) to (12g) di connected. Therefore, the printing side J8HT is applied to the switch section (10) to make the switch section conductive, and each switch transistor (12a
) to (12g) are electrically connected through text signals 9Dt-D7, the corresponding heating resistors (9a) to (9g) generate heat.

The character signal DI-D7 corresponds to the character pattern in the ROM of the control circuit (7) according to the character content inputted by the input means (8), and therefore printing is performed in the format shown in FIG. 3.

The control circuit (7) provides a forward rotation pulse MFP and a reverse rotation pulse MBP to a pulse motor drive circuit (A3) in order to control the pulse motor (2), and the drive circuit applies a forward rotation pulse MF to a pulse motor drive circuit (A3).
P or reverse pulse MBP, the pulse motor (2
) is rotated forward or reverse one step at a time in a 1-phase-2-phase excitation format.

FIG. 6 shows a specific circuit of the pulse motor drive circuit (113, l) and the pulse motor (2).
) is a theoretical diagram, but it essentially shows the
A four-phase motor with fourth windings (14a) to (14d) is shown. Pulse motor drive circuit (+ field is the first input terminal 05 that inputs the forward rotation pulse MFP) and the reverse rotation pulse M
Counter O? with @2 input terminals that input BP?
), and a decoder state that decodes the output of the counter.
The first to fourth windings (14a) to (14d) are output from the decoder.
) to excite and energize the driver transistors (19a) to (
19d). Kakunta αηI/i has a 3-bit output, is an octal upda kunkakunta, and has a forward rotation pulse M
Every time you input FP, the counter content 1 changes from 0 → 1 → 2 → 3
→... 7 → 0 → 1 →... and so on,
Also, every time the reverse pulse MBP is input, the counter contents are changed to 7→
6→5→...2→1→0→7→6→... Dakunkakunt. The contents of the above counter (l?) represented by the decoder state Vi3 bits are transferred to the 4-phase pulse motor (2
) is converted into 4-pit outputs A, B, A, and B in order to energize each history line in a 1-phase-2-phase excitation format. FIG. 7 shows a conversion logic table.

FIG. 8 shows a time chart of the forward rotation pulse MFP, reverse rotation pulse MBP, and printing pulse. As mentioned above, in the print standby state, the recording head (1) is at the PO pitch position, and when a print command is input from the input means (8), the forward rotation pulse MFPI is first generated, and the recording head 141 is at the PO pitch position.
Move to the 1 pitch position (Fig. 3) and print signal 9HT1 there.
occurs. At this time, since the character signal DI-D7 is selectively generated, dot recording is performed at the P1 pitch position. Thereafter, in the same way, MFP 2, HT2, MFP
a, HT3...MFPIS, HT6, MFPa
occurs in sequence, one character printing is completed, and the recording head (1)
F′iPo reaches the pitch position.

FIG. 9 shows a control program for the above-mentioned printing operation held by the control circuit (7), and this program is executed for each character printing command. First, the counter contents in RAM [
"5#" is set in the counter A (hereinafter simply referred to as counter A). This value corresponds to the number of pitches that advance the recording head (1) to the pl-pg pitch position. Next, the normal rotation pulse M
Outputs one FP. This output period, that is, the pulse width is 1
It is about 0 mesee. After that, output of the print signal HT and character signals D1 to D7 is started, and after 1 millisecond, these outputs are extinguished.
The pulse width of 1-Dt is 1 millisecond. then 0.5
After waiting for a time of m5ec, the contents of the counter A are decremented by 1, and the contents of the counter A are determined. If the contents are not "0", the process returns to the first normal rotation pulse output step.

When the content of counter A becomes "0", it is the time when recording head +11 has finished printing at the P5 pitch position.
Therefore, in order to further advance the recording head fl) to the PO pitch position, one normal rotation pulse MFP is outputted again, and finally the contents of the character counter area of the RAM (hereinafter simply referred to as character counter) are incremented by +1. One character printing operation is completed. The character counter stores the print digit position of the recording head, and if the content is expressed as "N" in decimal notation, the character counter will be located at the full (N+1)th digit of the recording head. Therefore, when the content of the character counter is "0", the recording head is at the initial position, that is, the first digit. Further, in this apparatus, the last printing digit of the recording line is set as the 80th digit, so when the recording head is at the 80th digit, the content of the character counter is "79".

4 again! Please refer to Figure J4 and Figure 8. Input means (8)
When a carriage return command is input from , or the printing up to the 80th digit is completed, the control circuit (7)
When a carriage return command is automatically output within
Each set is generated sequentially with P 1 and MBP 2 as a set. The pulse motor drive circuit (l advances the excitation state of the pulse motor (2) by two sets by one set of reverse pulses MBPI and MBP2, but since the time interval between MBPl and MBPz is extremely short (about several psec), The corresponding excitation state has no effect on the pulse motor (2).That is, the reversing pulse MBP1 decrement the content of the counter θη of the pulse drive circuit by 1, but the content is immediately changed by the following reversing pulse MBP2. Since the value changes to a value that is further subtracted by K "1", the excitation state of the first to fourth windings (14a) to (14d) corresponding to the reverse pulse MBPI does not substantially exist.

In this way, when the carriage returns, based on the 1-phase-2 set excitation format, excitation is performed skipping one phase, and the 7th
In terms of the counter contents in the diagram, it is essentially 7 → 5 → 3 → 1 →
7→5→...also I/'i6→4→2→0→6→4→・
A change in the excitation state corresponding to ... appears. The former is a 2-phase excitation type, and the latter is a 1-phase excitation type.

In the 1-phase - 2-set excitation format, the motor step rotation angle is smaller than in the 1-phase excitation format or the 2-set excitation format, so if you try to rotate the motor by the same angle in the same amount of time with each of the above excitation formats, For example, in the case of the 1-phase-2-set excitation type, the number of steps required is larger, so the first to fourth windings (14a) to
The excitation switching (14d) must be performed sooner. However, if the excitation is switched quickly due to the inductance of each winding, the excitation will shift to the next phase before the winding current reaches its rated value, resulting in a decrease in the generated torque.
In addition, due to the cut-off delay of the switch transistors (19a) to (19d), the excitation phase current continues to flow despite the phase switching, so it is necessary to use W once to speed up the excitation switching. be. Therefore, the one-phase-two-phase excitation type cannot sufficiently increase the rotational speed of the motor, and the negative excitation type is unsuitable for carriage returns that require high speed. .

In this device, during printing operation, the pulse motor (2) is driven in a 14ji-2 phase excitation format, so the recording blade (white l) can be sent at a small pitch, and the carriage return side is substantially 1-phase or 2-phase excitation. Pulse motor in excitation format (2)
This enables high-speed carriage return.

Whether the "above-mentioned phase at the time of the runner's return" becomes the t-magnetic type or the 2-phase excitation type depends on the pulse motor in the initial state of the device (for example, the reset state at power-on). Determined by the contents of counter 0η of circuit Q3.
However, if the initial value of the lFr filter counter (assuming that the recording head is at PO position 1 at this time) is set accordingly, it will become a two-phase excitation mode when the carriage returns, and a larger torque than the one-phase excitation mode can be obtained. It's a good rice bowl because it's delicious.

In this apparatus, in order to perform the carriage return at a higher speed and to quickly stop the recording head (1) at the initial position, if the recording head is far away from the initial position, after starting the carriage return, As shown in the figure, the generation interval of the set of reverse pulses MBP1 and MBP2 is gradually shortened, and when the recording head (1) approaches the initial position to some extent, the generation interval is gradually lengthened. More specifically, when the recording head (1) is at the 16th digit or above, the above-mentioned generation interval, that is, the motor drive frequency is increased to the highest drive frequency until it returns to the 8th digit, and thereafter decreases. On the other hand, when the recording head (1) is at a position below 16 digits, the driving frequency is increased until the recording head returns to a lower digit position approximately half of that position, and thereafter is decreased.

FIG. 10 shows a control program for the carriage return operation, which is held by the control circuit (7), and this program is executed when the carriage return command is output as described above.

First, check the contents of the character counter that stores the position of the recording head, and if the value is ``16'' or more, the value ``8'' is stored in the RAM counter B area (hereinafter simply referred to as counter B).
is set, and if it is smaller than "16", half the value of the content of character power is set in counter B. In the latter case, if the content of the character counter is not divisible by half, the value obtained by rounding up the decimal point after division is set.

Next, an initial value is set in a delay counter area (hereinafter simply referred to as delay counter) of the RAM. This value determines the generation interval of a set of reverse pulses, and in this embodiment, H"100" is selected.

In addition, the unit value "1" of this counter content is 0.016m
It corresponds to 5ec, so the above value “100” is 1
,6m5ec. Furthermore, the RAM counter C
A numerical value "6" is set in the area (hereinafter simply referred to as counter C). This value represents the number of pitches necessary to cause the recording head to move backward by one digit (ft).

Thereafter, the contents of the character counter and counter B are compared, and if the character counter is larger, it is checked whether the drive frequency of the pulse motor has reached the highest drive frequency. The maximum drive frequency mentioned above means the upper limit that the pulse motor can follow, and in this example, the period (reverse pulse MB
P l, MBP2 as a set, the interval between each set) is 0.2
It is 56m5ec. Therefore, when determining whether the maximum drive frequency has been reached or not, the content of the delay counter is 0.2.
A check is made from K to see if the value is "16" which corresponds to 56m5ec.゛If the above-mentioned failure has not been achieved, the content of the delay counter is set to -2, and after waiting for a time corresponding to the value of the delay counter in this state, a reverse pulse MBP1 with a pulse width of approximately zsec is generated.
Occurs by inheriting MBP2. This generation interval is several zsec, which is almost equal to the internal maximum processing speed of the control circuit (7).
That's about it.

It has already been mentioned that such short intervals result in a single-phase or two-phase excitation format. Furthermore, the contents of counter C are decremented by 2.

This is a process in which the recording head moves backward by two pitches due to the output of two reverse pulses.

After that, if the content of counter C is not "0-", return to ■ in the figure and repeat the above operation.
When it becomes ",", the content of the character counter is decremented by 1, and then the content of the character counter is checked. If it is not "0", the process returns to (-) in the figure and the counter C is set to "6" again. Then, the content of the delay counter is -2 until the maximum drive frequency is reached.
and repeat the above operation. When the maximum drive frequency is reached, the content of the delay counter (d becomes constant, and ■
Repeat between ~■. In this way, as the recording head approaches the initial position, the content of the character counter becomes smaller than that of counter B.

In this case, the reverse pulse MBP is applied in order to stably stop the recording head at the initial position.1. It is necessary to gradually lengthen the interval between occurrences of the MBP 2 set. Therefore, the delay counter is incremented by 2 each time it passes through sections 1 to 2 in the figure.

The above operation is repeated and the content of the character counter becomes "0".
In this case, the carriage return operation is completed after waiting for 20 m5ec, which is the time required for the recording head to come to a complete standstill at the initial position. Although the numerical values have been given, these numerical values are merely examples, and it goes without saying that they can be changed to appropriate values.

Furthermore, although the above embodiment is directed to a serial multi-printer, the present invention is also applicable to other recording apparatuses such as facsimiles, etc., in which the forward movement of the recording head by a pulse motor is performed in accordance with a 1-phase to 2-phase excitation format. Validly applied.

As is clear from the above explanation, according to the present invention, one phase -
Since the pulse motor is driven in a two-phase excitation format, it is possible to accurately transfer the recording/rad in the forward direction at a small pitch, and when the recording head returns to its initial position, the pulse motor is driven in a one-phase or two-phase excitation format. Therefore, the recording head can be restored with good luck. Furthermore, according to the present invention, since the excitation format for returning the recording head to its initial position can be obtained simply by controlling the generation interval of the reversal pulse, a special excitation format switching circuit is provided in the pulse motor drive circuit. There is no need to incorporate it, and the circuit configuration becomes simple.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, FIG. 1 is a schematic diagram of the recording head movement system, FIG. 2 is a front view of the recording head, FIG. 6 is a diagram showing the recording format, and the fourth factor is an electric circuit diagram. 5 and 6 are detailed circuit diagrams of the JJL section, FIG. 7 is a conversion logic diagram, FIG. 8 is a signal time chart, and FIGS. 9 and 10 are program Ω flow charts. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] (11) A recording apparatus that moves a recording head reciprocally along a recording line by the driving force of a pulse motor and records on recording paper during the forward movement, which has a first input terminal, a second input terminal, and a second input terminal. A pulse motor drive that moves the excitation state of the pulse motor forward or backward according to a 1-phase-2-phase excitation format when a forward rotation pulse is input to the terminal or when a reverse rotation pulse is input to the I/I second input terminal. v1 circuit, and a control circuit that supplies the forward rotation pulse or reverse rotation pulse to the pulse motor drive circuit in accordance with the forward or backward movement of the recording head, and the control circuit supplies the reverse rotation pulse to the pulse motor drive circuit at short intervals. A recording device characterized in that two pulses are generated as a set.