JPH08205591A - Facsimile unit - Google Patents

Abstract

PURPOSE: To prevent a scanning motor from heating by a current carried continuously in an inner winding when a reading buffer is full of reading data of manuscripts and the scanning motor is stopped for a while. CONSTITUTION: A pulse generator circuit includes a main control unit 1 for carrying a manuscript under control, a speed setting means 21 for generating a drive clock on the basis of a control signal from the main control unit 1, a motor drive means 22 for generating an exciting current on the basis of the drive clock from the speed setting means 21 and the control signal from the main control unit 1, and a scanning motor (M) driven by the exciting current form the motor drive means 22 and carrying the manuscript. When the scanning motor (M) is temporarily stopped, the exciting current is stopped under control or the excitation current is stopped just after a previously set time goes by.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile machine, and more particularly, to control of a scanning motor in a facsimile machine which conveys a read original by a scanning motor during a temporary stop during the original conveyance.

[0002]

2. Description of the Related Art Generally, a facsimile apparatus is provided with a mechanism for conveying an original including a scanning motor, drives the scanning motor to convey the original to a reading apparatus, and completes main scanning for one line of the original. Then, the document is conveyed by one line in the sub-scanning direction, and is discharged after the reading is completed.

Image data read by the reading device is sequentially stored in a read buffer, and when the read buffer stores a predetermined number of lines of image data, a process corresponding to the operation mode is performed on the stored data. Be seen. That is, the stored data is encoded and transmitted by the modem at the time of scanner transmission, the stored data is subjected to necessary image processing and outputted to the printing means at the time of scanner / copy, and the stored data is encoded at the time of memory storage. Stored in storage memory.

If the processing speed of the transmission processing by the modem, the printing processing by the printing means, etc. is slower than the document conveying speed and the reading speed of the reading device, the reading buffer becomes full during reading of the original, and the read image is read. Since the data cannot be stored in the reading buffer, the scanning motor needs to be temporarily stopped to stop the reading.

Since the scanning motor is composed of a stepping motor, it is driven by the exciting current supplied from the motor driving means, and its rotation speed is determined by the speed at which the current flowing through the motor winding is switched. Therefore, the scanning motor can be temporarily stopped by temporarily stopping the switching of the exciting current flowing through the motor winding.

[0006]

However, when the reading buffer becomes full during the reading of the original and it is necessary to temporarily stop the scanning motor, and when the switching of the exciting current flowing through the motor winding is stopped, the motor winding is stopped. There was a problem that the current would continue to flow in the line, and the current would cause the scan motor to generate heat.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to prevent heat generation of a scanning motor when the scanning motor can be temporarily stopped during reading an original.

[0008]

According to another aspect of the present invention, a facsimile apparatus according to the present invention has a main control section for controlling the conveyance of a document and a drive clock based on a control signal from the main control section. A speed setting means for generating, a motor driving means for generating an exciting current based on a control signal from the main control section and a driving clock from the speed setting means, and rotationally driven by the exciting current supplied from the motor driving means,
It is composed of a scanning motor that conveys a document.

[0009]

In the facsimile apparatus according to the present invention as set forth in claim 1, when the scanning motor is temporarily stopped during the reading of the original, the main control section outputs a control signal for instructing the speed setting means to stop the rotation. A control signal for instructing to stop the excitation is output to the motor driving means. The speed control means stops the output of the drive clock based on the rotation stop signal, and stops the rotation of the scanning motor. On the other hand, the motor drive means stops the supply of the exciting current to the scanning motor based on the exciting stop signal, and the exciting current supplied to the scanning motor stops.

In the facsimile apparatus according to the second aspect of the present invention, when the scanning motor is temporarily stopped during the reading of the original, the main controller outputs a control signal for instructing the speed setting means to stop the rotation. Upon receiving the control signal, the speed control means stops the output of the drive clock, and the rotation of the scanning motor stops. After that, after a lapse of a predetermined time, the main control unit outputs a control signal for instructing the motor drive means to stop the excitation, and the motor drive means receiving this control signal stops the supply of the excitation current to the scanning motor.

In the facsimile apparatus according to the present invention as defined in claim 3, the main control section outputs a control signal for instructing the speed setting means to stop the rotation while the document is being read, and the speed control means which has received the control signal outputs the control signal. When the output of the drive clock is stopped and the rotation drive of the scanning motor is temporarily stopped, and when there is a drive command after the output of the drive clock has been stopped and before the predetermined time has elapsed, the main control unit causes the motor drive means. Output a control signal for instructing re-driving to the speed setting means without outputting a control signal for instructing to stop the excitation of the scanning motor, so that the scanning motor is driven to rotate without stopping the supply of the excitation current to the scanning motor. Start.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of the overall construction of a facsimile apparatus according to the present invention. This facsimile apparatus includes a main controller 1 for controlling the entire facsimile apparatus, a scanning motor M,
Connected to the document sensor S, the transmitted stamp St and the reading head H, the reading control unit 2 for controlling the feeding of the document and reading the image data thereof, the control program of the main control unit, various data, and the like are stored. Storage means 3,
It is composed of a recording unit 4 for printing image data, a modem 5 for transmitting and receiving data, and a scanning unit 6 for input by an operator.

When the main controller 1 issues an instruction to convey and read an original, the reading controller 2 drives the scanning motor M to convey the original, and the image data read by the reading head H is read by a reading buffer (not shown). ).
When a predetermined number of lines of image data is stored in the reading buffer, the stored data is processed according to the operation mode. When the reading buffer becomes full during the reading of the document, the main control unit 1 outputs a control signal for instructing the reading control unit 2 to stop driving the scanning motor M.

The reading control unit 2 of the above facsimile apparatus
FIG. 2 shows an example of the configuration of the motor control unit 20 that controls the scanning motor M provided therein. This motor control unit 20
Includes a motor speed setting register 21a and a clock divider 21b, and outputs a drive clock speed setting means 2
1 and a motor driving unit 22 that generates an exciting current to be supplied to the scanning motor based on the driving clock.

The main controller 1 uses the motor speed setting register 21.
Set the motor speed to a and set the frequency divider 2 based on this setting.
1b divides the system clock and outputs a drive clock. The motor driving means 22 supplies an exciting current to the stepping motor M based on the driving clock, and the stepping motor M rotates. When the main control unit 1 outputs the drive stop control signal, the speed control means 21 stops the drive clock, so that the motor drive means 22 causes the scan motor M to operate.
For this reason, a constant excitation will be continuously performed. Therefore, the exciting current acts as a holding force for the rotating shaft of the scanning motor M, but the current continues to flow in the same winding of the scanning motor M, so that the scanning motor M generates heat.

On the other hand, when the main controller 1 outputs a control signal for stopping the excitation to the motor driving means 22, the motor driving means 22
Stops the supply of the exciting current to the scanning motor M. Therefore, although the holding force does not act on the rotary shaft of the scanning motor M, the exciting current does not flow, so that the heating of the scanning motor M can be prevented. A flowchart showing the basic operation of the facsimile apparatus according to the present invention is shown in FIG.
Shown in

When the document reading for one page is started, the image is read and the document is conveyed in the sub-scanning direction for each line of the document in the main scanning direction (10).
0) is encoded (101). It is checked whether the encoded image data has reached the storage memory capacity of 64 Kbytes (102). As a result, if it has not reached 64 Kbytes, it is checked whether or not the encoding of the read data for one page is completed (103). If not, the encoding of the image data is continued. (10
1).

On the other hand, when 64 Kbytes are reached and the storage memory is full, or when the encoding of the read data for one page is completed, the reading is stopped (104). To stop reading, the main control unit 1 outputs a drive stop control signal to the motor control unit 2, the speed control unit 21 stops the drive clock based on the drive stop signal, and the motor drive unit 22 Switching of the exciting current flowing through the motor winding is stopped (105).

At this time, a predetermined value corresponding to the delay time until the excitation is stopped is set in the excitation stop counter of the scanning motor M (106). Then, it is checked whether or not reading and coding for one page are completed (10
7) If not completed, a scan motor drive command is issued at the time when the memory capacity of the reading buffer becomes available, and the original is read (100) and encoded (10) again.
1) is performed.

Here, the stop of the excitation of the motor is processed by the interrupt routine based on the value of the above-mentioned counter for stopping the excitation. This interrupt routine is shown in FIG.
203. This interrupt routine is activated by a timer interrupt every 10 msec, and checks whether the value of the excitation stop counter is zero (200). If the result of the counter is zero, the interrupt processing is ended, but if it is not zero, subtraction is performed (201),
As a result, it is checked whether the value of the excitation stop counter has become zero (202). When it becomes zero, the excitation of the motor is stopped (203), and when it does not become zero, the interrupt processing is ended. With this interrupt routine, it is possible to stop the excitation of the motor after a predetermined time has passed since the predetermined value was set in the excitation stop counter (106).

Further, in the flow chart 1 shown in FIG.
In 00, when the scanning motor drive command is issued at the time when the memory capacity of the reading buffer becomes available and the original is read and encoded again, the value of the excitation stop counter is reset to zero. With this setting, the excitation will not be stopped by the interrupt routine thereafter.

[0022]

As can be understood from the above description, in the facsimile apparatus according to the present invention as set forth in claim 1, the excitation current does not continue to flow because the excitation is stopped when the scanning motor is temporarily stopped. It is possible to prevent heat generation of the scanning motor at the time of temporary stop.

In the facsimile machine according to the second aspect of the present invention, since the exciting current is supplied only for a fixed time after the scanning motor is stopped, the holding force by the exciting current acts on the scanning motor. Therefore, the motor can be stopped with high accuracy, and heat generation of the scanning motor can be prevented. That is, when the motor excitation is stopped at the same time as the motor driving is stopped, the holding force of the motor due to the excitation current is also lost at the same time, so that the scanning motor is completely accurately stopped due to the inertia and mechanical vibration of the motor. Therefore, an error will occur, but as the time sufficient for the scanning mechanism to completely stop, the motor is accurately stopped by stopping the excitation after the elapse of a predetermined time, and It is possible to prevent heat generation during suspension.

In the facsimile apparatus according to the present invention, the excitation is stopped after the driving clock is stopped by temporarily stopping the scanning motor and when the driving command of the scanning motor is given before the elapse of the predetermined time. Since the driving clock is restarted without causing the above, the reading and encoding of the original can be started quickly.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration example of an entire facsimile apparatus according to the present invention.

FIG. 2 is a diagram showing a configuration example of a motor control unit of the facsimile apparatus shown in FIG.

FIG. 3 is a flowchart showing a basic operation of the facsimile apparatus according to the present invention.

FIG. 4 is a flowchart showing an interrupt process of the facsimile apparatus according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Facsimile apparatus having a departmental communication aggregation function 10 ... Signal processing unit 11 ... Storage means

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G06F 15/64 325 E

Claims (3)

[Claims] 1. A facsimile apparatus which conveys a read original by a scanning motor, wherein the scanning motor is constituted by a stepping motor, and when the scanning motor is temporarily stopped during the reading of the original, the excitation of the scanning motor is performed. A facsimile machine characterized by being stopped. 2. When the scanning motor is temporarily stopped during the reading of a document, after the driving clock for the scanning motor is stopped, a predetermined time is set as a time sufficient for the scanning mechanism to be completely stopped. The facsimile apparatus according to claim 1, wherein the excitation is stopped after a lapse of time. 3. The driving clock is restarted without stopping the excitation when a driving command of the scanning motor is issued after the driving clock is stopped by the temporary stop of the scanning motor and before the elapse of the predetermined time. The facsimile apparatus according to claim 2.