JP2706012B2 - Data processing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data processing device including an optional device having a motor, and a main device for outputting a pulse signal to the motor to drive and control the motor.

[0002]

2. Description of the Related Art A data processing device such as a personal computer or a word processor is provided with various optional devices in a detachable manner, and controls the type of the mounted optional device by determining its type. For example, in a word processor, a feeder for automatically feeding print paper is provided as an optional device, and the optional device is controlled by a control signal from a main device. In this case, the main unit needs to determine which option device is currently mounted. Conventionally, a detection signal line corresponding to each option device is provided in the main body device, a pull-up resistor is connected to each detection signal line, and a terminal to which the detection signal line is connected to each option device is grounded. Accordingly, when the optional device corresponding to each detection signal line is not connected, “H” is input to the detection unit, and when the optional device is connected, “L” is input. Was able to determine the presence or absence of wearing.

[0003]

However, according to the above-described detection method, a detection signal line must be provided for each optional device, and if a new optional device is to be mounted, a connector or the like must be provided. The shape must also be changed.

For example, in a conventional word processor or the like, an automatic sheet feeder for sequentially feeding cut sheets as a feeder for feeding print paper is detachably provided as an optional device. In this case, the roll sheet can be used and convenience is increased. In this case, it is necessary to determine whether the auto sheet feeder is connected, whether the auto cut feeder is connected, or whether nothing is connected.
With the conventional method for determining an optional device as described above, it is necessary to newly provide a detection signal line for determining the mounting state of the auto cut feeder, and the specification of the connector and the like is changed, so that the cost is increased. There was a problem.

Some optional devices such as an automatic sheet feeder and an automatic cut feeder are provided with a pulse motor. The pulse motor drives a motor by outputting a pulse signal to each winding of the motor through a plurality of control signal lines by a pulse generating means of a main body device. SUMMARY OF THE INVENTION It is an object of the present invention to provide a data processing device that can recognize a new optional device by using the control signal line and the detection signal line without providing a dedicated detection signal line.

[0006]

FIG. 1 is a block diagram showing the configuration of the present invention. The data processing device of the present invention comprises a main unit 31 and an optional unit 32 connected to the main unit. The optional unit 32 includes a plurality of control signal lines 33 on which control signals for driving a motor are provided. A control signal terminal 34 connected thereto, a motor 37 connected to the control signal terminal 34, a detection signal terminal 36 for outputting a detection signal indicating the connection state and type of the optional device 32, and one of the control signal terminals. A connection circuit 38 for connecting the detection signal terminal; the main unit 31 includes a pulse signal generation unit 39 that outputs a pulse signal to a control signal terminal 34 a to which the connection circuit 38 is connected; Terminal 36 has a detection signal line 3
A detection unit 40 connected via the control unit 5; a determination unit 41 that reads a state of a detection signal input to the detection unit 40 to determine a connection state and a type of the optional device;
It has.

[0007]

In the data processing apparatus according to the present invention, the optional device 3 (newly connectable) is connected to the main unit 31.
When the main unit 31 outputs a pulse signal to one of the control signal terminals to the option device 32, that is, the control signal terminal 34a to which the connection circuit is connected, the detection unit 40 Receives a pulse signal waveform corresponding to the pulse signal. This pulse signal waveform is read by the judging means 41, and it is judged that the optional device 32 is connected to the main device 31.

When the optional device 32 is connected to the main unit 31, a pulse signal is input to the detection unit 40 when a pulse signal is output to the specific control signal terminal 34a as described above. However, when a conventional optional device is connected to the main device 31, "L" is input to the detection unit 40. When the optional device is not connected, “H” is input to the detection unit 40. Thereby, the connection state of the optional device and the type of the connected optional device are determined.

[0009]

FIG. 2 is a system block diagram of a word processor which is an embodiment of the data processing apparatus of the present invention.

The main unit 13 of the word processor is provided with a drive unit for controlling the microcomputer 1 and each operation unit. The ROM 3 of the microcomputer 1 stores a control program for controlling a driving unit of each operation unit. The CPU 2 operates various operation units according to a program stored in the ROM 3, that is, an input unit 5, a display unit 6, a heating element energizing circuit 7, a printer driving circuit 8, a feeder driving circuit (motor driving circuit and pulse generating means) 9,
It controls the feeder sense (detection unit) 10 and the like.

In this case, the RAM 4 is used as a working area. The input unit 5 controls the keyboard, and a key input signal from the keyboard is input to the CPU 2 via the input unit. The display unit 6 is a part that controls a display screen such as a CRT or a liquid crystal screen, and a display signal is transmitted to the CRT, the liquid crystal screen, or the like via the display unit, and display processing is performed. A print signal and a print data signal are sent to the heating element energizing circuit 7, and the thermal head generates heat in a print pattern. At the time of printing processing, a printer drive signal is sent to the printer drive circuit 8 to drive the motor, so that the carriage supporting the thermal head is moved.

The main body device 13 is provided with an auto sheet feeder 11 or an auto cut feeder 12 as an optional device 14 in a detachable manner. The optional device 14 connected by connecting the connector of the automatic sheet feeder 11 or the connector of the automatic cut feeder 12 to the connector provided in the main device 13 is controlled by the main device 13. In this apparatus, since the mounting of the automatic cut feeder is detected by also using the control signal line, it is not necessary to add a line for detecting the type of feeder as compared with a state in which only a conventional automatic sheet feeder can be connected. FIG. 3 is a partial circuit diagram when the auto cut feeder 12 is connected to the main body device 13 as an optional device.

The automatic cut feeder 12 is provided with a pulse motor 21. The main unit 13 and the automatic cut feeder 12 are connected by control signal lines 23a to 23d, a detection signal line 24, a power supply line 25, a ground line 26, and the like. Control signal line 23a
23d are the control signals output from the feeder driving unit 9 and the windings 2 of the pulse motor 21 of the auto cut feeder.
This is a signal line for transmitting to 1a to 21d. The feeder driving section 9 is a circuit that generates control signals AFM1 to AFM4 composed of pulse signals, and the output circuit 20 is an open collector circuit. The control signal lines 23a to 23d are connected to the control signal terminal 22 of the automatic cut feeder.

A control signal terminal 22a to which the control signal line 23a is connected is connected to a feeder sense (AFS) 10 via a connection circuit 27. A pull-up resistor R5 is connected to the control signal line 23a. The connection circuit 27 is a circuit for outputting a detection signal pulse corresponding to the control signal pulse to the control signal terminal 22a when the control signal pulse is input to the control signal terminal 22a.
1 to R4, transistors Q1 and Q2, and a diode D1. The operation of the connection circuit 27 is as follows. FIG. 5 is a time chart showing the waveforms of the output pulse AFM1 to the control signal line 23a and the input pulse to the AFS10.

When the output of the feeder driving section 9 is at "H" level, "L" level is inputted to the control signal terminal 22 by the output circuit 20 composed of an open collector.
Then, a current flows from the power supply VA through R1 → R2 → D1, the voltage dividing resistors of R1 and R2 are applied between the base and the emitter of Q1, and Q1 is turned on. When Q1 turns on, Q
2 turns on. As a result, the input signal to the AFS 10 becomes "L" level (ground potential). On the other hand, when the output of the feeder driving unit 9 is at the "L" level, Q1 and Q2 are turned off, so that the input signal to the AFS 10 is at the "H" level (+ Vcc).

Therefore, when the pulse signal AFM1 is output to the control signal line 23a as shown in FIG.
The inverted pulse waveform is input to FS10.

The main sheet device 13 includes an auto sheet feeder 1.
1 can also be connected. FIG. 4 is a partial circuit diagram when the automatic sheet feeder 11 is connected to the main body device 13. Winding 21 of pulse motor 21 of auto sheet feeder 11
a to 21 d are excited by a pulse signal output from the feeder driving unit 9. A ground line 26 is directly connected to the detection signal line 24 input to the AFS 10, whereby the “L” level is always input to the AFS 10.

Therefore, in this embodiment, when the connection state of the feeder is distinguished, when the auto sheet feeder (ASF) 11 is connected to the main unit 13, the control signal line 23a as shown in FIG. Output signal AF to ｄ23d
An “L” level is input irrespective of M1 to AFM4,
When an automatic cut feeder (ACF) 12 is connected, when a pulse signal is output to the AFM 1, a pulse signal corresponding to the pulse waveform is input to the AFS 10. This makes it possible to determine whether the main unit 13 is connected to the ASF 11 or the ACF 12. When no optional device is connected to the main unit, an "H" level (Vcc) is always input to the AFS 10 as shown in FIG. 5, thereby detecting whether or not the optional device is connected. You.

The detection of the connection state of the type of the optional device and the detection are performed while the printer is stopped. The pulse generating means in the feeder driving section 9 outputs a pulse signal having a width which does not affect the motor 21. Since the pulse motor 21 is driven by exciting the winding only when a pulse having a predetermined width or more is given, the type of the optional device is detected without operating the motor 21 with a pulse not exceeding the predetermined width. be able to. In this embodiment, both the motor driving circuit and the pulse generating means are provided in the feeder driving circuit 9, but the motor driving circuit may be used as the pulse generating means. That is, the connection state and the type of the optional device are detected using the drive pulse of the motor. In this case, there is no need to separately provide the pulse generating means 39 shown in FIG.

Next, a method for detecting the home position of the cutter using the control signal line in the automatic cut feed 12 will be described.

In FIG. 3, a home position switch HP is provided between the connection circuit 27 and the control signal line 23d.
A cutter detection circuit including Sw, a diode D2, and a resistor R6 is connected. HPSw is an auto cut feeder 1
2, a sensor disposed at the home position of the cutter for cutting the roll sheet, which is turned on when the cutter is not at the home position and turned off when the cutter returns to the home position. The operation of this circuit is as follows, and FIG. 6 is a time chart showing the state of the cutter position when the printer stops.

First, when the cutter is not at the home position,
When PSw is on (“H” level) and the control signal line 23d is at “H” level, from + VA to R1 → R6
→ D2 → Current flows via HPSW and Q1 turns on. Then, Q2 is also turned on and “L” level is input to AFS10. However, when the cutter is at the home position and HPSw is off ("L" level), Q
1 and Q2 remain off, so the AFS 10 has "H"
The level is entered. Therefore, a pulse is output to the control signal line 23d as shown in FIG.
By detecting the input level to the AFS 10 at the level, it is possible to detect whether or not the cutter is at the home position. When detecting the cutter position when the motor is stopped, a pulse having a width that does not affect the driving of the motor 21 is given to the control signal line 23d by the pulse generating means in the feeder driving unit 9. Also, when detecting the cutter position, to prevent erroneous detection,
When the "H" level is detected three consecutive times, it is determined that the cutter is at the home position.

When it is determined that the cutter is not at the home position when the motor 21 stops, the motor 21 is driven to return the cutter to the home position. This operation will be described below. FIG. 7 is a time chart showing the cutter position detection processing when the motor is driven.

In this case, the control signal lines 23a to 23d
Is a pulse AF having a width necessary to drive the motor 21.
M1 to AFM4 are provided. In this case, the pulse AFM
Pulse signals for driving the motor output from the motor driving circuit are also used for 1 to AFM4. Here, output signals AFM1 to AFM4 from the feeder control unit 9 and AFS10
The relationship of the input signal to is as follows.

When AFM1 is at "H" level, the input to AFS is at "L" level.

When the AFM 4 is at the "H" level and the HPS
When w is at the “H” level, the input to the AFS is at the “L” level.

When the AFM 4 is at the "H" level and the HPS
When w is at the “L” level, the input to the AFS is at the “H” level.

The levels of AFM2 and AFM3 do not affect the input level of AFS.

From the above relationship, AFM1 at the time of cutter detection
In order to prevent the influence of the level, the input level of the AFS 10 is detected a predetermined time after the AFM 3 generates a pulse. That is, in FIG. 7, the timing is indicated by. At this timing, the input level of the AFS 10 is detected, and from the “L” level (the cutter is not at the home position) to the “H” level (the cutter is at the home position), three consecutive “H” levels When the detection is continued, the control signal is stopped and the rotation of the motor 21 is stopped. Thus, the cutter can be returned to the home position.

In this embodiment, the position of the cutter is detected by the pulse signal generated by the pulse generating means in the feeder driving section 9 while the motor is stopped, and the motor driving circuit in the feeder driving section 9 is driven while the motor is being driven. Although the position of the cutter is detected using the pulse signal for driving the motor generated in the above, it is possible to completely use the pulse generating means for the motor driving circuit, and to detect the cutter position only during driving of the motor. Good.

[0031]

According to the present invention, one of the control signal lines can be used.
Since the connection state and type of the optional device can be determined using the book, there is no need to separately provide a dedicated line. Therefore, there is no need to change the connector specifications.

[Brief description of the drawings]

FIG. 1 shows a configuration of the present invention.

FIG. 2 is a system configuration diagram of a word processor according to an embodiment of the present invention;

FIG. 3 is a partial circuit diagram when an auto cut feeder is connected.

FIG. 4 is a partial circuit diagram when an automatic sheet feeder is connected.

FIG. 5 is a time chart showing a determination process of an optional device in a stopped state.

FIG. 6 is a time chart showing a cutter position determination process in a stopped state.

FIG. 7 is a time chart showing a cutter position determination process when the motor rotates.

[Explanation of symbols]

Reference Signs List 9 feeder drive unit (motor drive circuit and pulse generation means) 10 feeder sense (detection unit) 12 auto cut feeder 13 main unit 21 pulse motor 22 control signal terminals 23a to 23d control signal line 24 detection signal line 25 power supply line 26 ground Line 27 connection circuit

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location B65H 3/00 310 B41J 29/00 B

Claims (1)

(57) [Claims] A control signal terminal connected to a plurality of control signal lines on which a control signal for driving a motor is mounted; and a control signal terminal connected to the control device. A motor connected to the control signal terminal, a detection signal terminal that outputs a detection signal indicating the connection state and type of the optional device, a connection circuit that connects one of the control signal terminals and the detection signal terminal, The main unit comprises: a pulse signal generating means for outputting a pulse signal to a control signal terminal to which the connection circuit is connected; a detection unit connected to the detection signal terminal via a detection signal line; A determination unit configured to read a state of a detection signal input to the unit and determine a connection state and a type of the optional device.