JPH06292399A - Driving device for motor - Google Patents

Abstract

PURPOSE:To use one kind of motor driving device in common for plural kinds of facsimile devices without generating large vibrations in the facsimile device even in the case of using plural kinds of facsimile devices. CONSTITUTION:This motor driving device starts driving a motor within a period of time of outputting a reference pulse P1 after a motor driving command is received. A timing pulse P having a period of 1/N times of the reference pulse P1 is sequentially received or generated, and it has a timing pulse generation circuit 6 for outputting timing pulses Q1 to Q4 of the order which is selected in advance from the plural timing pulses P, and is constituted so that the driving of a motor is started by the timing of the pulse output delivered from the timing pulse generation circuit 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor drive device suitable for a drive device for moving a document in a sub-scanning direction when reading and scanning a document image in a facsimile machine, or for feeding and feeding a recording sheet at the time of printing output. Regarding

[0002]

2. Description of the Related Art In a facsimile apparatus, when scanning a document image, a motor for feeding a document is driven each time main scanning of one line of the document is completed to feed the document in the sub-scanning direction. Need to let. Therefore, conventionally, when the main scanning for one line is completed, a motor drive command is issued from the signal processing unit (CPU) of the facsimile apparatus at that time, so that the motor is driven thereafter. In all of the conventional motor drive devices, the time (delay time) from when the motor drive command is issued until the motor is actually started is determined by the hardware configuration of the motor drive device and fixed. It was the actual situation that had been converted.

[0003]

However, the above-mentioned conventional devices have the following problems. That is, in order to intermittently feed a facsimile original in the sub-scanning direction, it is necessary to intermittently drive and rotate the motor. However, intermittent intermittent driving of the motor not only vibrates the motor driving device, However, it is not preferable because it causes a mechanical vibration in each part of the facsimile device around it.
Furthermore, this vibration may develop into a vibration with a larger amplitude by resonating each part of the facsimile apparatus. In such mechanical vibration, the mechanical structure of each part of the facsimile machine (natural frequency of each part, etc.) and the drive cycle of the motor are closely related, and the drive start time of the motor depends on the facsimile machine. The mechanical vibration of the facsimile apparatus can be suppressed to some extent by adjusting the value to.

However, in the conventional motor drive device, the delay time from when the motor drive command is issued to when the motor drive is actually started is fixed. Is a suitable device that does not cause vibration, but when the motor drive device is applied to other types of facsimile machines, the delay time cannot be changed accordingly and large mechanical vibration may occur. is there. Therefore, conventionally, the unit of one type of motor driving device cannot be shared by the driving devices of many types of facsimile devices. As a result, conventionally, it is necessary to prepare the same number of motor drive devices in which the desired delay time is individually set according to the model of the facsimile device as many as the model of the facsimile device, and to incorporate this into each facsimile device individually. Therefore, its manufacturing efficiency was poor. Further, such a difficulty has occurred not only in the facsimile device but also in the scanner, printer device and the like.

The present invention has been proposed in view of the above points, and even when a plurality of types of facsimile machines and the like are used, those machines do not generate large vibration. The purpose is to enable one type of motor drive device to be commonly used by a plurality of types of facsimile devices and the like.

[0006]

SUMMARY OF THE INVENTION A motor drive device according to the present invention, which has been proposed to achieve the above object, is a motor in which motor drive is started after a reference pulse is output after receiving a motor drive command. The driving device includes a timing pulse generation circuit that sequentially receives or generates timing pulses having a cycle of 1 / N times the reference pulse, and outputs timing pulses in a preselected order among the plurality of timing pulses. The motor drive is started at the pulse output timing from the timing pulse generation circuit.

[0007]

In the motor drive device of the present invention having the above-mentioned structure, the motor drive is actually started.
After the reference pulse is output after the motor drive command is received, a predetermined timing pulse in a preselected order is generated among the timing pulse output timings having a 1 / N times cycle of the reference pulse. It is time to output from the circuit. Therefore, for the time (delay time) from when the motor drive command is received until the motor drive is actually started, the timing pulse of any order is selected from among the plurality of timing pulses and output from the timing pulse generation circuit. It is possible to arbitrarily increase or decrease the number depending on whether or not to do so. As a result, the motor drive device according to the present invention is
When used in multiple types of facsimile machines, it is possible to individually set the optimum motor drive start delay time that does not cause mechanical vibration in each of these machines, and one type of motor drive machine can be used in multiple types of facsimile machines. It becomes possible to share it with others.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an example of a hardware configuration of a motor drive device according to the present invention, and FIG. 2 is a time chart showing various signals. The motor drive device shown in FIG. 1 is, for example, a stepping motor 1 applied to document feeding or recording paper feeding of a facsimile machine, a driver 2 for supplying driving power to the stepping motor 1, and an exciting phase for the driver 2. Excitation phase generation circuit 3,
The excitation phase generation circuit 3 is composed of a pulse rate generation circuit 4 for supplying a pulse of a desired rate, a timing pulse generation circuit 6 for controlling a delay time of motor drive start, a data register 5, and the like. Here, the data register 5 receives a command signal from the CPU (signal processing unit) of the facsimile apparatus and transmits a control command to each of the above units.

The timing pulse generating circuit 6 is provided with D flip-flop circuits 6a and 6b, a shift register 6c, a selector 6d, etc., and receives a control command of a motor drive command from the data register 5 and It is provided so as to receive the reference pulse P1 and the timing pulse P from a separately provided pulse generation circuit (not shown). Of these, the reference pulse P1 is a pulse having a constant cycle S as shown in FIG.
Is the processing time for one line of the facsimile machine, that is, 1
This corresponds to the time required to read the original image for one line and then convert the read analog data into a digital binary image signal, or the printout time for the image for one line.

The motor drive command from the data register 5 is made valid after the timing pulse generating circuit 6 receives the drive command and after receiving a new reference pulse P1. Therefore, the period from the reception of the reference pulse P1a after receiving the motor drive command to the reception of the next reference pulse P1b is the effective period of the drive command. The timing pulse P is synchronized with the reference pulse P1 at a cycle that is, for example, 1/4 times the cycle S of the reference pulse P1, and any one of the pulses a to d of the timing pulse P selected in advance. One of them is output from the selector 6d of the timing pulse generation circuit 6, and the output timing becomes the drive start timing of the stepping motor 1.

The timing pulse generation circuit 6 is configured to process each of the above signals as follows. That is,
First, the output signal Q1 from the D flip-flop circuit 6a for inputting the motor drive command signal and the reference pulse P1, the output signal Q1 and the signal of the timing pulse P inverted by the NOT circuit (NOT) (P 'in FIG. 2). To input D
The output signal Q2 from the flip-flop circuit 6b is as shown in FIG. The signal Q1 among them is input to the selector 6d as it is, and the signal Q2 and the timing pulse P are input to the shift register 6c, so that the data is sequentially shifted and input to the selector 6d. Therefore, the selector 6d is similar to the case of sequentially receiving the four types of timing pulses Q1 to Q4 shown in FIG. Of these four types of timing pulses Q1 to Q4, Q1 has a delay time of 0 with respect to the reception timing of the reference pulse P1 a, Q2 has a delay time of S / 4, Q3 has a delay time of S / 2, and Q4 is The delay time is 3S / 4. Selector 6
d is configured to output one timing pulse selected in advance from the four types of timing pulses Q1 to Q4 to the pulse rate generation circuit 4 side by command setting made in advance on the facsimile device side. There is. The timing pulse is selected by a software program for controlling the facsimile machine.

The pulse rate generating circuit 4 generates a pulse having a desired rate based on the clock signal. The pulse rate generating circuit 4 receives a predetermined timing pulse selected from the timing pulse generating circuit 6 as a starting point. Is generated and transmitted to the excitation phase generation circuit 3.

The motor drive device according to this embodiment has the above-mentioned structure, and its operation will be described below. First, for example, when the reading and scanning of one line of the original image is completed by the facsimile device, the motor drive command is input from the data register 5 to the timing pulse generation circuit 6. Then,
As shown in FIG. 2, the timing pulse Q1 transmitted at the same time as the next reference pulse P1a and the timing pulses Q2 to Q4 transmitted thereafter are the selector 6d.
Entered in.

Therefore, if, for example, Q1 is selected in advance from these four types of timing pulses Q1 to Q4, this timing pulse Q1 will be output when the pulse selector 6d outputs it to the pulse rate generating circuit 4. The excitation phase is supplied from the pulse rate generation circuit 4 to the excitation phase generation circuit 3, and the stepping motor 1 starts its driving. In this case, the driving start timing of the stepping motor 1 is the same timing as the output timing of the reference pulse P1a, and the delay time is zero. On the other hand, for example, when the timing pulse Q2 is selected in advance, the stepping motor 1 is output at the output timing of this timing pulse Q2.
Even if the driving is started and the timing pulse Q1 is selected, it can be delayed by S / 4. Similarly, if the timing pulses Q3 and Q4 are selected,
The delay time for starting the driving of the stepping motor 1 is S /
It can be set to 2,3S / 4.

According to the above motor drive device, the delay time capable of suppressing the mechanical vibration of each part of the facsimile machine due to the intermittent rotation of the stepping motor 1 to a minimum is arbitrarily selected according to the model of the facsimile machine. It can be set, and it is possible to suppress mechanical vibration of various facsimile machines. Moreover, when the motor driving device is applied to the document feeding of the reading / scanning section of the facsimile device, the timing of the motor driving can be matched with the timing of the image processing by setting the delay time. The image quality of the read scan can be improved. Also, when applied to paper feeding of recording paper in the print output unit, the motor drive timing and the print output timing can be matched, and the image quality of the print output can be improved. Furthermore, when the stepping motor 1 is used at each of the two positions of the reading and scanning section and the printing output section of one facsimile apparatus, the reference pulse P1 is shared so that the two stepping motors can be synchronized. it can. Therefore, it becomes possible to execute both the reading and scanning processing and the printing output processing when both the two stepping motors are stopped and the mechanical vibration is suppressed.

In the present invention, the delay time for starting the motor drive does not have to be constant, and the delay time is sequentially selected according to the specific paper feed status of the original or recording paper. , May be set. Delay time,
It is also possible to control each line of the original image. In the above embodiment, the reference pulse P1 and the timing pulse P generated outside the timing pulse generating circuit 6 are also included.
However, the present invention is not limited to this. For example,
In the timing pulse generation circuit 6, the reference pulse P1
Alternatively, the timing pulse P may be generated and processed.

Further, in the present invention, the shorter the cycle of the timing pulse P is compared with the reference pulse P1, the finer the delay time can be adjusted in multiple stages. It does not ask for the value of the cycle. The point is that the cycle may be 1 / N times as long as the reference pulse P1. Other,
The use of the motor drive device according to the present invention is not limited to the use in a facsimile machine. It can also be applied to other devices that need to suppress mechanical vibrations due to motor driving, such as scanners and printers.

[0018]

As can be understood from the above description, the motor drive device according to the present invention is suitable for a plurality of types of facsimile machines and the like, even if they are intended for use. Since each motor drive start delay time can be individually set, a large vibration is not generated in the device, and one type of motor drive device can be commonly used for a plurality of types of facsimile devices and the like. As a result, it is possible to eliminate the inconvenience of separately manufacturing a motor drive device suitable for each model and incorporating the motor drive device into the model, thereby improving the productivity. In addition, since the motor drive start timing and hence the motor drive rotation timing can be variably set by variably setting the delay time, the motor drive is stopped at the time of reading and scanning of a document image or printing output in a facsimile machine or the like, so that mechanical vibration does not occur. It is possible to bring the image into the state, and it is possible to obtain the advantage that the scanning accuracy of the image or the quality of the printed image can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a hardware configuration of a motor drive device according to the present invention.

FIG. 2 is a time chart showing various signals.

[Explanation of symbols]

 1 Stepping motor 2 Driver 3 Excitation phase generation circuit 4 Pulse rate generation circuit 5 Data register 6 Timing pulse generation circuit P1 Reference pulse P, Q1-Q4 Timing pulse

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[Procedure amendment]

[Submission date] May 20, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

Therefore, if, for example, Q1 is selected in advance from these four types of timing pulses Q1 to Q4, this pulse is output when the timing pulse Q1 is output from the selector 6d to the pulse rate generating circuit 4. The excitation phase is supplied from the rate generation circuit 4 to the excitation phase generation circuit 3, and the stepping motor 1 starts its driving. In this case, the driving start timing of the stepping motor 1 is the same timing as the output timing of the reference pulse P1a, and the delay time is zero. On the other hand, for example, the timing pulse Q
When two advance selected, the stepping motor 1 starts to drive the output timing of the timing pulse Q2, than when selecting the timing pulse Q1
It can also, delaying S / 4. And so on
If the timing pulses Q3 and Q4 are selected, the drive start delay time of the stepping motor 1 can be reduced to S / 2, 3S.
It can be set to / 4.

Claims (1)

[Claims] 1. A motor drive device in which motor drive is started after a reference pulse is output after receiving a motor drive command, wherein timing pulses having a cycle of 1 / N times the reference pulse are sequentially received or generated. A motor drive device having a timing pulse generation circuit for outputting a timing pulse of a preselected order among the plurality of timing pulses, and configured to start the motor drive at the pulse output timing from the circuit.