JPH06292395A - Driving device for motor - Google Patents

Abstract

PURPOSE:To use one kind of a motor driving device in common to plural kinds of facsimile devices and the like without generating vibrations in those devices even in the case where the plural kinds of facsimile devices are used. CONSTITUTION:This motor driving device is provided with a first excitation phase generating circuit 4 for generating 1-2 phase excitation phase S1 of a predetermined excitation ratio and a second excitation generating circuit 5 for generating 1-2 phase excitation phase S2 of a different excitation ratio from the excitation phase S1 on the basis of the excitation phase S1 outputted from the first excitation generating circuit 4, and is so constituted as to output any of the excitation phases to the driver side which is selected in advance from the excitation phases S1, S2 generated from both the first and the second excitation phase generating circuits 4, 5.

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 reading and scanning a document image in a fine mode, the document feed amount in the sub-scanning direction needs to be 1/2 of the document feed amount in the normal mode. Therefore, as the motor driving device for the stepping motor used for feeding the document, the two-phase excitation is applied in the normal mode of the facsimile, but the one-two phase excitation must be performed in the fine mode. Therefore,
In the conventional motor drive device, when performing the 1-2 phase excitation of the motor, the 1-phase excitation time and the 2-phase excitation time are set to the same time by the hardware configuration, such as the 1-phase excitation and the 2-phase excitation. The actual situation was that the time ratio was fixed.

[0003]

However, the above-mentioned conventional devices have the following problems. That is, it is necessary to suppress the mechanical vibration of the motor as much as possible so as not to hinder the image reading and scanning of the facsimile when the motor is driven and rotated. The mechanical vibration of the motor is caused by the facsimile in which the motor is incorporated. The mechanical structure of the device and the excitation time of the motor are closely related. Therefore, when a conventional motor in which the excitation time ratios of both phases of 1-2 phases are set at equal intervals of 1: 1 is used in a facsimile machine of a specific model, a large motor vibration does not occur. However, if it is applied to another type of facsimile machine having a different structure, a large vibration may occur in relation to the mechanical characteristics of the facsimile machine.

However, conventionally, since the excitation ratios of both phases of 1-2 phases are fixed by hardware, when used in a plurality of types of facsimile machines having different structures, the mechanical characteristics of each of the facsimile machines. Therefore, it is impossible to change the excitation ratio of the 1-2 phase. as a result,
Conventionally, due to the incompatibility between the mechanical characteristics and the excitation ratio of the facsimile machine, a large vibration is generated in the motor drive device and various parts around the motor drive device, which deteriorates the reading and scanning accuracy of the original image.
Alternatively, there have been problems such as deterioration of image quality printed on recording paper. Especially, in the facsimile machine, the 1-2 phase excitation of the motor is performed in the fine mode, which requires a better image quality than in the normal state.
There was an even greater need to prevent image quality deterioration due to vibration during -phase excitation.

In the past, as a measure for preventing motor vibration, the same number of motor drive devices as the model of the facsimile machine were prepared in which desired excitation ratios were individually set according to the model of the facsimile machine. It has also been applied to individually incorporate each facsimile apparatus, but this has a drawback that the manufacturing efficiency is poor and the manufacturing cost increases. 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 a large vibration, and The purpose is to enable a plurality of types of motor drive devices to be shared by a plurality of types of facsimile devices and the like.

[0007]

SUMMARY OF THE INVENTION A motor drive device according to the present invention, which is proposed to achieve the above object, generates a first excitation phase for generating an excitation phase for 1-2 phase with a predetermined excitation ratio. The circuit and the excitation phase output from the first excitation phase generation circuit, the excitation ratio of 1-
A second excitation phase generating circuit for generating an excitation phase for two phases, and for selecting any one of the excitation phases generated by the first and second excitation phase generating circuits. It is configured to output to the driver side.

[0008]

In the motor drive device according to the present invention having the above-mentioned structure, the first excitation phase generating circuit can generate the excitation phase for 1-2 phase excitation with the predetermined excitation ratio, and the second excitation phase. The phase generation circuit can generate an excitation phase for 1-2 phase excitation having an excitation ratio different from that based on the excitation phase,
Either one of these excitation phases will be supplied to the driver side. Therefore, when such a motor drive device is used for a plurality of types of facsimile devices, etc., among the excitation phases with different excitation ratios generated by the two excitation phase generation circuits, according to the mechanical characteristics of the respective devices,
By selecting the preferred excitation phase for vibration prevention,
It is possible to suppress motor vibration. As a result, one type of motor drive device can be shared by many types of facsimile devices and the like.

[0009]

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. The motor drive device shown in the figure includes, for example, a stepping motor 1 which is applied to document feeding of a facsimile machine or paper feeding of recording paper, a driver 2 which supplies driving power to the stepping motor 1, and a selector 3 to the driver 2. First and second excitation phase generation circuits 4 and 5 for supplying a desired excitation phase via the clock generation circuit 6 and a clock generation circuit 6 for supplying a clock having a desired pulse rate to the two excitation phase generation circuits 4 and 5,
It is composed of a variable excitation control signal generating circuit 7, a data register 8 and the like provided between both the clock generating circuit 6 and the second excitation phase generating circuit 5. Here, the data register 8 receives a command signal from the CPU (signal processing unit) of the facsimile apparatus and transmits various control commands described later to the above units.

The clock generating circuit 6 divides an internal clock signal supplied from another circuit by a frequency dividing counter 6a to generate a plurality of types of clock signals having different pulse rates. That is, by dividing the internal clock signal of FIG. 2A, the pulse rates differ as shown in, for example, FIGS.
The clock signals 1 to 7 of a kind (a part of the clock signal is omitted in the figure) are generated. Further, the clock generation circuit 6 outputs two kinds of clock signals out of the seven kinds of clock signals 1 to 7 from the selector 6b. The selection of the clock signal is made by a control command from the data register 8. The two selected signals are output as clock signals CLK1 and CLK2. As shown in FIGS. 3A and 3B,
The cycle of one clock signal CLK2 is, for example, C of the other.
The rate ratio is set in advance to be ¼ of the cycle of LK1. Therefore, one clock signal CLK
If 1 is selected, the other clock signal CLK2 is inevitably determined.

The first excitation phase generation circuit 4 generates a predetermined excitation phase based on the one clock signal CLK1. The types of the excitation phase are the excitation phases S for two phases, And two types of excitation phases S1 and 1-2 for excitation phase. FIG. 4 shows such a first
2 shows an example of each pulse A to D of the 1-2 phase excitation phase S1 output from the excitation phase generation circuit 4 of FIG. In the excitation phase S1 shown in the figure, the one-phase excitation time and the two-phase excitation time are equal, and the excitation ratio is 1: 1.

The variable excitation control signal generation circuit 7 is for generating a variable excitation control signal necessary for changing the excitation ratio of 1-2 phase excitation, and is a 2-bit counter 7a, a decoder 7b, and a selector 7c. Etc. In the variable excitation control signal generation circuit 7, for example, three types of variable excitation control signals 1 to 3 shown in FIGS. 3C to 3E are generated from the clock signal CLK2 shown in FIG.
Of these signals, only one type of variable excitation control signal of the order selected by the control command from the data register 8 is output from the selector 7c.
The variable excitation control signals 1 to 3 are clock signals CL.
1 of the cycle T of the clock signal CLK1 as compared with K1.
The delay amount is sequentially increased by / 4 cycle.

The second excitation phase generation circuit 5 comprises a D flip-flop circuit 5a and a variable excitation combination circuit 5b. The former D flip-flop circuit 5a selects the excitation phase S1 for the 1-2 phase output from the first excitation phase generation circuit 4 from the variable excitation control signal generation circuit 7 and outputs the predetermined variable excitation control. It is delayed in synchronization with the signal. On the other hand, the latter variable excitation combination circuit 5b is
A logical product (AND) or a logical sum (OR) of the excitation phase sampling signal output from the D flip-flop circuit 5a and the 1-2 phase excitation phase S1 output from the first excitation phase generation circuit 4. To generate the excitation phase S2,
One of these AND and OR is selected by a control command from the data register 8. As a result, as described later, the second excitation phase generation circuit 5 outputs the excitation phase S2 having an excitation ratio different from that of the 1-2 phase excitation phase S1 output from the first excitation phase generation circuit 4. To be done.

The selector 3 includes two-phase and one-two-phase excitation phases S, S1, which are generated by the first excitation phase generation circuit 4.
And any one of the 1-2 excitation phases S2 generated by the second excitation phase generation circuit 5 is selected by the control command from the data register 8 and sent to the driver 2 side. It is what is output.

The motor drive device according to this embodiment has the above-described structure, and its operation will be described below. First, when a desired clock signal CLK1 selected in advance is output from the clock generation circuit 6 and input to the first excitation phase generation circuit 4, the first excitation phase generation circuit 4 uses for two-phase excitation. And two types of excitation phases S and S1 for 1-2 phase excitation are generated, and these excitation phases S and S1 are both input to the selector 3. Therefore, the facsimile machine is set to the normal mode instead of the fine mode, and the stepping motor 1
When the normal one-step rotation operation of 1 is performed, the former excitation phase S for two phases may be selected by a control command from the data register 8 and output from the selector 3 to the driver 2 side.

On the other hand, the latter excitation phase S1 for 1-2 phases has the same one-phase excitation time and two-phase excitation time as shown in FIGS. 4 (b) to (e). Therefore, in the fine mode of the facsimile apparatus that causes the stepping motor 1 to perform the half-step operation, if it is preferable to drive the motor with the 1-2 phase excitation ratio of 1: 1 to prevent vibration, the 1-2 It suffices to select the excitation phase S1 for the phase and output it from the selector 3 to the driver 2 side. The excitation phase S1 also serves as a basic excitation phase for generating the excitation phase S2 having a different excitation ratio in the second excitation phase generation circuit 5.

On the other hand, in parallel with the output of each excitation phase S, S1 from the first excitation phase generation circuit 4, in the variable excitation control signal generation circuit 7, another clock signal CLK2 output from the clock generation circuit 6 is outputted. Based on FIG. 3, (c) to (e) of FIG.
The variable excitation control signals 1 to 3 are generated. Then, one of these variable excitation control signals selected by the control command is output from the selector 7c and input to the D flip-flop circuit 5a of the second excitation phase generation circuit 5. The D input of the D flip-flop circuit 5a is the first
Since it is the excitation phase S1 for the 1-2 phase from the excitation phase generation circuit 4, the excitation phase S1 for the 1-2 phase is delayed by the pulse timing of the variable excitation control signal. That is, when the variable excitation control signal generation circuit 7 outputs the variable excitation control signal 2 shown in (b) of FIG. 5, for example, 1 of FIG. The pulse A of the excitation phase S1 for the −2 phase is delayed as shown in FIG. Further, such a delay process is not limited to the pulse A of the excitation phase S1 and is similarly performed for the other pulses B to D (the D flip-flop circuit 5a of the pulses A to D of the excitation phase S1). A total of four are provided to correspond to each).

Next, the D flip-flop circuit 5a
Each sampling signal of the excitation phase S1 output from the variable excitation combination circuit 5b is set by a control command among AND and OR with the excitation phase S1 output from the first excitation phase generation circuit 4. Or processing. Therefore, for example, when OR is selected, the variable excitation combination circuit 5
Each pulse of the excitation phase S2 generated in b is (e) of FIG.
To (h), and the pulses A (OR) and B (O
Excitation phases S2 of R), C (OR), and D (OR) are input to the selector 3. Thus, such excitation phase pulses A (OR), B (O
R), C (OR), and D (OR) are pulses A to D of the basic excitation phase S1 for the 1-2 phase generated by the first excitation phase generation circuit 4.
In the D flip-flop circuit 5a, the T / 4 shown in FIG.
And the delayed pulse is OR-processed with the original basic excitation phase pulses A to D in the variable excitation combination circuit 5b. Therefore, the excitation phase pulse A (O
The waveforms of R), B (OR), C (OR), and D (OR) are different from A to D of the basic excitation phase S1 and are different from the excitation phase A'to FIG.
Like D ', the excitation phase of two phases is longer than that of one phase. Further, when the AND process is performed by the variable excitation combination circuit 5b, unlike the above, the excitation time of one phase rather than two phases is increased, as in the case of the pulses A ′ to D ′ of the excitation phase S2 shown in FIG. Will be long.

In this embodiment, any one of the three types of variable excitation control signals 1 to 3 generated by the variable excitation control signal generating circuit 7 can be selected. The excitation phase S1 for the two phases is set to the D flip-flop circuit 5
In the variable excitation combination circuit 5b, it can be delayed in three stages by a.
Two types of processing, ND or OR, can be selected. Therefore, in the second excitation phase generation circuit 5, 1-2 of the excitation ratios of 6 types are used.
It is possible to generate the excitation phase S2 for the phase. Therefore, when vibration occurs in the motor at the output of the 1-2 phase excitation phase S1 output from the first excitation phase generation circuit 4, it is desired to be generated by the second excitation phase generation circuit 5 from the selector 3. By outputting the excitation phase S2 for the 1-2 phase with the excitation ratio of 2 to the driver 2 side, it becomes possible to prevent the motor vibration.

In the above embodiment, since the second excitation phase generation circuit 5 is configured to generate the excitation phases for 1-2 phases with a total of 6 types of excitation ratios, among the 6 types of excitation ratios. From here, you can select the most suitable excitation phase to prevent motor vibration.
Although practically preferable, the present invention is not limited to this. The second excitation phase generation circuit 5 according to the present invention may be capable of generating only one type of excitation phase S2 having an excitation ratio different from the excitation phase S1 generated by the first excitation phase generation circuit 4. . Even in such a case, of the two types of excitation phases S1 and S2 generated by the first and second excitation phase generation circuits 4 and 5 and having different excitation ratios, the excitation phase on the side preferable for preventing motor vibration This is because, can be selectively used, and the effect intended by the present invention can be obtained.

Further, in the above embodiment, the second excitation phase generation circuit 5 is connected to the D flip-flop circuit 5a and AND and O.
Although the case where it is configured with the variable excitation combination circuit 5b that selectively performs the R process has been described, the specific hardware configuration of the second excitation phase generation circuit 5 according to the present invention is by no means limited to this. The point is that it has a function of generating an exciting phase having an exciting ratio different from the exciting phase based on the exciting phase output from the first exciting phase generating circuit. Furthermore, in the above embodiment, the first excitation phase generation circuit 4 also generates excitation phases for two phases, but the present invention is not limited to this. The first excitation phase generation circuit 4 may be a generation circuit dedicated to the 1-2 phase. Further, the excitation ratio of the 1-2 phase excitation phase generated by the first excitation phase generation circuit 4 is not always 1: 1.
Does not have to be.

Further, according to the present invention, when the motor driving device is incorporated into one facsimile machine and used, the
It is not always necessary to fix the excitation ratio of the excitation phase for each phase. The excitation phase for the 1-2 phase may be sequentially reselected in accordance with the specific paper feed status of the original or recording paper according to the status. It is also possible to control the selection and setting of the excitation ratio for each line of the document image.

Further, the present invention can be applied to both cases of constant voltage and constant current, and the kind thereof is not limited. In addition, the motor drive device according to the present invention is not limited to use as a facsimile device.
The present invention can also be applied to other devices such as scanners and printer devices that need to suppress mechanical vibrations caused by driving a 1-2 phase excitation motor.

[0024]

As can be understood from the above description, according to the motor drive device of the present invention, even when a plurality of types of facsimile machines are intended for use, the machine of each device Since the excitation ratio of the excitation phase for the 1-2 phase can be changed according to the characteristics, it is possible to appropriately suppress the motor vibration caused by the incompatibility of the excitation ratio. As a result, it is possible to perform image reading scanning and printing output in a facsimile device or the like without undue mechanical vibration, and it is possible to obtain the advantages that the image reading scanning accuracy or the image quality of a printed image can be improved. Further, since one type of motor drive device can be shared by a plurality of types of facsimile devices, etc., it is necessary to manufacture a motor drive device suitable for each model individually and to incorporate this into the model individually. Inconvenience can be eliminated and there is a real benefit that contributes to productivity improvement.

[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 an internal clock and clock signals of various pulse rates generated based on the internal clock.

FIG. 3 is a time chart showing a clock signal and a variable excitation control signal.

FIG. 4 is a time chart showing a clock signal and a 1-2 phase excitation phase generated by a first excitation phase generation circuit.

FIG. 5 is a time chart showing a basic excitation phase and an excitation phase for the 1-2 phase generated in the second excitation phase generation circuit based on the basic excitation phase.

FIG. 6 is a time chart showing an example of an excitation phase generated by a second excitation phase generation circuit.

FIG. 7 is a time chart showing another example of the excitation phase generated by the second excitation phase generation circuit.

[Explanation of symbols]

 1 Stepping Motor 2 Driver 3 Selector 4 First Excitation Phase Generation Circuit 5 Second Excitation Phase Generation Circuit 5a D Flip-Flop Circuit 5b Variable Excitation Combination Circuit 6 Clock Generation Circuit 7 Variable Excitation Control Signal Generation Circuit 8 Data Register S1, S2 Excitation phase for 1-2 phase

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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]

Claims (1)

[Claims] 1. A first excitation phase generation circuit for generating an excitation phase for 1-2 phase with a predetermined excitation ratio, and an excitation phase based on the excitation phase output from the first excitation phase generation circuit. A second excitation phase generation circuit for generating an excitation phase for 1-2 phase having an excitation ratio different from that of the first and second excitation phase generation circuits. A motor drive device configured to output any of the excited phases to the driver side.