JPH07181601A - Driving device for linear motion - Google Patents

Abstract

PURPOSE:To execute speed control and to improve image quality by obtaining information on the positions of mirror bases with high accuracy while saving a space and reducing a weight. CONSTITUTION:An optical driving device 3 is composed of coil units 102, 102 respectively connected to the mirror bases 10, 11 and a guide shaft 101 which is freely slidably passed into the respective coil units 102 and of which the axial direction is set in the moving direction of a copying lamp. This guide shaft 101 has a magnet part 107 which is a magnet type stator of a linear motor and a magnetic scale 109 is integrated via a magnetic shielding member 108 in its groove part. A coil 102a for excitation is arranged in the coil units 102 and a pickup element 111 for the magnetic scale and a pickup element 110 for the stator are arranged near this coil.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear motion drive device using a linear motor as a drive source, which is applied to, for example, an optical system drive device of a copying machine.

[0002]

2. Description of the Related Art For example, in an electrophotographic copying machine or a digital copying machine, an original on a platen is scanned by a light source lamp, and the reflected light is guided to a photosensitive member by using a plurality of reflecting mirrors to be exposed. The body is exposed to form an electrostatic latent image, the electrostatic latent image is developed, and the developed image (toner image) is transferred onto the paper to obtain an image corresponding to the original image on the paper. It has become. In this case, the light source lamp and a part of the reflecting mirror are configured to be moved at a speed corresponding to the photoconductor by the driving device in order to scan the document on the document table.

As a drive source of such a drive unit, a stepping motor or the like whose rotation angle can be easily controlled has been widely used, and normally, a single main motor is usually used as a light source lamp or a reflecting mirror. Along with the driving of the optical system, the developing system, the paper feeding system, the paper discharging system and the like are driven. However, when each system is driven by a single main motor, the driving torque of the main motor varies with the driving of each system, and the rotation speed of the main motor also varies. If such speed fluctuations occur during image formation, the speeds of movement of the light source lamp and the reflecting mirror will of course have speed irregularities, which will lead to problems such as deterioration of image quality.

Therefore, in order to solve such a problem, a linear motor is used as a drive source of a drive unit of an optical system of a copying machine, and a stator member of the linear motor is attached to a mirror base shaft of a movable reflecting mirror of the optical system. A linear motion optical system drive mechanism is provided in which a linear motor moving member (movable member) is provided on a movably supported mirror base that is provided with a (stator). It is disclosed in Japanese Unexamined Patent Publication No. 56-167356.

The merit of using a linear motor as a drive source of an optical system of a copying machine is that the structure is simpler than that of other motors and direct drive is possible in a linear direction.

[0006]

However, in the copying machine of the above invention, there is no disclosure about the structure for obtaining highly accurate position information of the mirror base, which is the driven body, and its speed control. As disclosed in the above invention, when the two movable reflecting mirrors of the copying machine are linearly driven at a speed ratio of 1: 0.5, the depth of focus of the lens causes
If they are not driven within a position error of about ± 0.5 mm, a focus shift will occur, resulting in deterioration of image quality.

On the other hand, if it is a scanner type of a digital copying machine, one linear drive is sufficient, but recently, it is possible to use four linear drives.
Since a resolution of 00 to 600 dpi (63.5 to 42 μm) is required, highly accurate position information and speed control are required accordingly.

Therefore, the present invention has been made in view of the above problems, and an object thereof is to enable speed control by obtaining highly accurate position information of a driven body and save space. -To provide a linear motion drive device that can be made lightweight.

[0009]

In order to solve the above-mentioned problems, a linear motion drive device according to a first aspect of the present invention is provided.
A linear motor coil-type mover directly connected to the driven body, and a linear motor magnet slidably penetrating the coil-type mover and having its longitudinal direction aligned with the moving direction of the driven body. A mold stator, a magnetic scale for linear position detection is provided on a part of the magnet type stator via a magnetic shield part, and the magnet type stator, the magnetic shield part, and the magnetic scale are integrated. A magnetic sensor for a stator that detects the polarity of the magnet type stator, which serves as a guide shaft for the carrier of the driven body, and near the coil type mover, and a magnetic sensor for a magnetic scale that reads position information from the magnetic scale. It is characterized by the provision of.

According to a second aspect of the present invention, there is provided a linear movement drive device according to the first aspect of the present invention, which is based on the output of the magnetic sensor for a magnetic scale. Then, a speed control means for moving the driven body at a predetermined speed is provided.

According to a third aspect of the present invention, there is provided a linear movement driving device, wherein, in order to solve the above-mentioned problems, in the linear movement driving device according to the second aspect, a magnetic sensor output for a magnetic scale is output during driving. Duty ratio calculating means for determining the duty ratio of the waveform width of the waveform, duty ratio determining means for determining whether the duty ratio calculated by the duty ratio calculating means is within a specified range, and this duty ratio determining means When it is determined that the duty ratio is out of the specified range in (1), a first warning means is provided for performing a warning operation by determining a failure on the magnetic scale side.

According to a fourth aspect of the present invention, there is provided a linear movement driving device according to the second aspect of the present invention, wherein the linear scale driving device according to the second aspect responds to an output of the magnetic sensor for a magnetic scale. And a first frequency determining means for determining whether or not the frequency of the first pulse signal is within a specified range, and the first frequency determining means determines that the frequency of the first pulse signal is out of the specified range. Then, the frequency of the second pulse signal corresponding to the output of the magnetic sensor for the stator is monitored, and the second frequency determination means for determining whether or not this frequency is within the specified range, and the second frequency determination. If it is determined to be within the specified range by the means, it is determined to be a failure on the magnetic scale side, whereas if it is determined to be outside the specified range, it is determined to be a failure of the motor drive system, and each failure is determined. Responsive warning action It is characterized in that a second warning means for carrying out.

According to a fifth aspect of the present invention, in order to solve the above-mentioned problems, in the linear movement drive device according to the third aspect, the duty ratio is determined by the duty ratio determining means. If it is determined that the pulse signal is out of the specified range, the counting means counts the pulse signal with the abnormal duty ratio, and the first warning means determines that the magnetic scale side has a failure when the count number reaches a predetermined number. It is characterized by performing the warning operation.

According to a sixth aspect of the present invention, there is provided a linear motion driving device as set forth in the fifth aspect, wherein the duty ratio determining means calculates the duty ratio. It is determined whether the duty ratio calculated by the means is within the specified range, and if the duty ratio is outside the specified range, the first abnormality judgment range close to the specified range or further out of the first abnormality judgment range. It is determined whether it is within the second abnormality determination range,
When the duty ratio determination means determines that the first warning means is in the second abnormality determination range, the first warning means counts less than a reference count number for determining a failure on the magnetic scale side when the duty ratio determination means is in the first abnormality determination range. The feature is that the warning operation is performed by the number.

According to a seventh aspect of the present invention, in order to solve the above-mentioned problems, a linear motion drive device according to the second aspect,
In the drive device for linear movement according to 3, 4, 5 or 6,
It is characterized in that the driven body is a reflecting mirror carrying body carrying a light source lamp and a reflecting mirror with respect to a document placed on a document table.

[0016]

According to the structure of claim 1, since the magnetic stator is provided with the magnetic scale for linear position detection,
By using this magnetic scale, highly accurate position information of the linear motor can be obtained. And in this case,
By providing the speed control means having the structure of claim 2, it is possible to perform highly accurate speed control. For example, as in the structure of claim 7, the linear motion drive device can be applied to an optical system drive device of a copying machine. Thus, even when the above-mentioned two movable reflecting mirrors are linearly driven at a speed ratio of 1: 0.5, it is possible to effectively prevent deterioration of image quality without causing a focus shift or the like.

Moreover, since the magnet type stator and the magnetic scale are integrally used as the guide shaft for the carrier of the driven body via the magnetic shield portion, both are integrated by the interposed magnetic shield portion. Even when formed as an object, magnetic interference does not occur, and the magnetic sensor for a magnetic scale can detect a signal from the magnetic scale without being affected by the strong magnetic field of the magnet-type stator. Although the weight of the magnetic shield portion is increased as compared with the configuration in which the magnet is attached separately from the magnet type stator, further space saving and weight reduction can be achieved.

According to the third aspect of the present invention, the duty ratio calculation means obtains the duty ratio of the waveform width of the output of the magnetic sensor for the magnetic scale being driven, and the duty ratio determination means obtains the duty ratio within the specified range. If it is out of the specified range, the first warning means judges that the magnetic scale side is out of order, and performs a warning operation, for example, lighting a warning lamp or displaying a message on the display unit. Therefore, the magnetic scale is, for example, the contact of a magnetizing driver,
Even if the characteristics deteriorate due to magnetic interference due to some reason such as aging, an abnormality is predicted at the stage before the output from the magnetic sensor for the magnetic scale cannot be obtained at all and a serviceman call, etc. is made. It becomes possible to deal with it. Therefore, for example, when the present device is applied to the optical system driving device of the copying machine as in the structure of claim 7, it is possible to avoid the situation that the device function is stopped due to a failure and the copying operation cannot be performed, The downtime of the device can be reduced and the operating rate of the device can be improved.

According to the structure of claim 4, the first frequency judging means judges whether or not the frequency of the first pulse signal according to the output of the magnetic sensor for the magnetic scale is within the specified range, and the specified range is determined. If it is outside, the second frequency determination means monitors the frequency of the second pulse signal according to the output of the magnetic sensor for the stator, determines whether this frequency is within the specified range, and outputs the second warning. The means determines that the magnetic scale side is out of order when the second frequency determining means determines that it is within the specified range, and determines that the motor drive system is out of order when it is outside the specified range. In addition, since the warning operation corresponding to each failure, for example, lighting of the warning lamp corresponding to each failure point and displaying a message to that effect on the display unit, the failure point can be identified by self-diagnosis by the device itself. Limited. Therefore, for example, as in the structure of claim 7,
When this device is applied to the optical system driving device of a copying machine, even if the device function is stopped due to a failure, it can be easily repaired, reducing the burden on service personnel and reducing downtime of the device. While improving the operating rate of the device, and
Serviceability can also be improved.

According to the fifth aspect of the present invention, when the duty ratio determining means determines that the duty ratio is out of the specified range, the counting means counts the pulse signal having an abnormal duty ratio, and outputs the first warning. When the number of counts reaches a predetermined number, the means determines the failure on the magnetic scale side and performs a warning operation.Therefore, when issuing a warning, for example, a duty ratio abnormality due to an abnormality such as a failure. Can be distinguished from an abnormal duty ratio due to electrical noise or the like which is not a failure, and in addition to the operation of the configuration of claim 3,
A more accurate warning operation with less error can be implemented. Therefore, for example, by applying to the optical system driving device of the copying machine having the structure of claim 7, false alarm can be prevented, the reliability of the user's device can be improved, and the burden on the service person can be reduced. In addition, it is possible to suppress the occurrence of unnecessary downtime of the apparatus and further improve the operation rate of the apparatus.

According to the structure of claim 6, the duty ratio determining means determines whether or not the duty ratio calculated by the duty ratio calculating means is within the specified range, and the duty ratio is outside the specified range. If the first near the specified range
It is determined whether it is the abnormality determination range or the second abnormality determination range that is further out of the first abnormality determination range, and the first warning means is determined by the duty ratio determination means to be the second abnormality determination range. And the warning operation is performed with a count number smaller than the reference count number for determining a failure on the magnetic scale side in the first abnormality determination range, the duty ratio is largely deviated, that is, the failure state. When the stage immediately before is detected, the warning operation is executed without any delay, and in addition to the effect of the configuration of claim 5, the warning operation can be executed at a more excellent timing. . Therefore, by applying it to an optical system driving device such as a copying machine as in the structure of claim 7, for example, a device having higher reliability and less likely to break down can be realized.

[0022]

【Example】

[Embodiment 1] An embodiment of the present invention will be described with reference to FIGS.
The explanation is based on the following. In this embodiment, the linear motion driving device is applied to the optical system driving device 3 of the copying machine.

In FIG. 2, the main body 1 of the copying machine is provided with a document table 29 made of transparent glass or the like on the upper surface thereof and a document table cover 30, and the optical system 2 is provided below the document table 29. The optical system 2 includes a copy lamp (light source lamp) 4 including a halogen lamp or the like for irradiating a document (not shown) placed on the document table 29 with light, and a plurality of light guided from the document to the photoconductor 12. It is composed of reflecting mirrors 5 to 8 and a zoom lens 9 provided in the optical path of the reflected light from the document. The copy lamp 4 and the reflecting mirror 5 are attached to a first mirror base (reflecting mirror carrier) 10 and the reflecting mirrors 6 and 7 are attached to a second mirror base (reflecting mirror carrier) 11, respectively. It is adapted to be driven by the optical system driving device 3 shown in a).

A photoconductor 12 is rotatably supported below the optical system 2. Around the photoconductor 12, a photoconductor 12 is provided.
As is well known, the charging device 13, the developing unit 14, the transfer device 15, the static eliminator 16 and the like are arranged. Further, on the paper feed side of the photoconductor 12, a paper feed unit 17 having a plurality of paper feed cassettes is provided.
And a registration roller 18 for temporarily stopping the paper output from the paper supply unit 17 and sending the paper to the photoconductor 12 at a predetermined timing, while a toner image is printed on the paper on the paper discharge side. And a fixing unit 19 for fixing to
A transporting device 20 for transporting the sheet to and a discharge tray 21 are provided. In addition, a sheet conveying path 22, an intermediate tray 23, a reversing unit 27, a sheet feeding roller 28, etc. are provided in the lower portion of the copying machine main body 1 for synthetic copying / duplex copying. In the above-mentioned apparatus, when copying, the mirror bases 10 and 11 are moved in the direction A while the surface of the photoconductor 12 is charged to a predetermined potential by the charger 13, and the original table 2 is moved.
A document (not shown) placed on the document 9 and covered with the document cover 30 is sequentially scanned by the copy lamp 4 from the front end. Then, the reflected light from the document is exposed to the photoconductor 12 via the optical system 2, so that an electrostatic latent image is formed on the photoconductor 12.

When an electrostatic latent image is formed on the photoconductor 12,
Then, the electrostatic latent image is developed with the toner supplied from the developing unit 14 to form a toner image. After that, the paper is conveyed from the paper supply unit 17 to the registration rollers 18, and is temporarily stopped as necessary, and then supplied to the photoconductor 12 at a predetermined timing. Then, the toner image is transferred onto the paper supplied by the transfer device 15, is then peeled off from the photoconductor 12, and is conveyed to the fixing unit 19 by the conveying device 20, where the toner image is fixed on the paper. Then, if it is a one-sided copy, it is discharged to the discharge tray 21 as it is. On the other hand, in the case of synthetic copying / duplex copying, the fixing unit 1
The sheet that has passed 9 is sent to the sheet conveying path 22. If it is a composite copy, it is discharged to the intermediate tray 23 as it is, while if it is a double-sided copy, it is reversed by the reversing unit 27,
It is discharged to the intermediate tray 23. When a predetermined number of sheets are accumulated in the intermediate tray 23, the sheets on the intermediate tray 23 are sequentially fed by the sheet feeding roller 28 from the uppermost one,
It is sent to the photoconductor 12 via the registration roller 18 again,
Copying will continue.

Next, the structure of the optical system driving device 3 will be described in detail with reference to FIGS. 1 and 3 to 5.

As shown in FIG. 1A, the optical system driving device 3 includes the above-mentioned first and second mirror bases 10 and 11.
Coil units 102, 102 respectively connected to
Both ends are supported by the guide shaft holder 106, and slidably penetrates the coil units 102,
It is configured by a guide shaft (supporting member guide shaft) 101 whose axial direction is set to the moving direction of the copy lamp 4. still,
Coil unit 102 in mirror base 10/11
The other part on the side opposite to the side connected to is supported by a rail member 105 arranged parallel to the guide shaft 101 so as to be slidable.

As shown in FIG. 1B, the guide shaft 101 has a magnet portion 107 in which a plurality of horseshoe-shaped (internal cavity) magnets, each of which has a cutout, are arranged. There is. These magnet units 107 include a magnet 107a having an S pole inside and an N pole outside,
The magnets 107b having N poles inside and S poles outside are alternately arranged to form a magnet type stator of a linear motor. In addition, the guide shaft 10
In the groove portion of the magnet portion 107 formed by the notch of each magnet in No. 1, the N pole and the S pole are arranged at a pitch of several tens of μm via the magnetic shield member (magnetic shield portion) 108.
A magnetic scale 109 in which the poles are magnetized and absolute position information is stored is fitted, and the magnet unit 1
07 and the magnetic scale 109 are integrated.

In such a structure in which the magnet section 107 and the magnetic scale 109 are integrated, if the magnetic scale 109 is directly provided on the magnet section 107 without the magnetic shield member 108 interposed, magnetic interference occurs, which will be described later. The magnetic scale pickup element 111 has a problem that it cannot read a minute pulse signal which is a position signal corresponding to the absolute position information of the magnetic scale 109.
In this embodiment, since the magnetic shield member 108 is interposed, the magnet portion 107 and the magnetic scale 10 are included.
9 is magnetically cut off, and there is no fear of causing the above-mentioned problems. As the magnetic shield member 108, one having a strong magnetic permeability such as iron is suitable, and the magnetic shield member 1 having a strong magnetic permeability is used.
By covering the groove end surface of the magnet portion 107 at 08, the magnetic flux Φ leaking from the magnet portion 107 passes through the inside of the magnetic shield member 108 having high magnetic permeability (low magnetic resistance), as shown in FIG. , Now, the magnet part 10
7 and the magnetic scale 109 are magnetically cut off from each other.

On the other hand, the coil unit 102 is shown in FIG.
As shown in (a), it is arranged along the outside of the guide shaft 101, and inside thereof, an exciting coil 102a (hereinafter simply referred to as coil) as shown in FIG. It is distributed. That is, the coil forms a coil type mover, and the guide shaft 101 and the coil unit 102 form a linear motor 103.

For example, the guide shaft 101 and the coil unit 102 are now in the positional relationship shown in the figure (note that, in the figure, for the sake of convenience, the covering portion of the coil unit 102 is removed), and the current I is as shown in the figure. If flowing, according to Fleming's left-hand rule, an electromagnetic force is generated in the B direction, the coil unit 102 moves in the B direction, and as a result, the mirror base 10 connected to the coil unit 102.
11 moves in the B direction. By utilizing the electromagnetic repulsive attraction force generated between the coil 102a and the magnet unit 107, a propulsive force is applied to the first and second mirror bases 10 and 11, and the series of operations described above for scanning the document. Are to be implemented. Furthermore, in the vicinity of the coil 102a inside the coil unit 102,
A stator pickup element (magnetic sensor for stator) 110, which is a Hall element that detects and outputs the polarity of the magnet portion 107, is provided at a portion of the guide shaft 101 facing the magnet portion 107, and a coil is provided. In the vicinity of 102a and at a portion facing the magnetic scale 109, a magnetic scale pickup element (for magnetic scale), which is a Hall element that detects the polarity of the magnetic scale 109 and reads and outputs the stored absolute position information A magnetic sensor) 111 is provided.

These stator pickup elements 110
Output and magnetic scale pickup element 111
The output from each of them becomes a second pulse signal / first pulse signal via a waveform processing circuit 113 and a waveform processing circuit 112 shown in FIG. 6, which will be described later, and is input to the control unit 31.

The driving of the linear motor 103 composed of the coil unit 102 and the guide shaft 101 is as follows.
For example, it is configured by the drive circuit 32 to which the 3-phase brushless drive shown in FIG. 4 is applied. The drive circuit 32 comprises a general three-phase inverter circuit, and as shown in FIG. 5, the stator pickup element 1 built in the coil unit 102.
When 10 detects the polarity of the magnet portion 107 of the guide shaft 101 and outputs the pulse signal to the drive circuit 32,
Accordingly, the transistors X, Y, Z, U, V, and W are turned on / off to switch the directions of the currents flowing through the three coils U, V, and W, and the coil unit 102 is continuously operated. . Further, the present copying machine is provided with a control unit 31 including a CPU shown in FIG. 6, and the control unit 31 receives the first pulse input from the magnetic scale pickup element 111 via the waveform processing circuit 112. The distance data of the coil unit 102 (that is, the positions of the mirror bases 10 and 11) is obtained by counting the digital pulse V _OUT of the signal, and the velocity data is obtained by measuring the period (frequency) of the pulse signal. In addition, the acceleration is obtained from the change of the obtained speed data, and the mirror bases 10 and 11 are driven at a predetermined speed, that is, the function as speed control means is provided.

The waveform processing circuit 112 includes a comparator 112a as shown in FIG.
At a, a digital pulse V _OUT is generated by comparing the output from the magnetic scale pickup element 111 with the reference voltage (V _ref ).

Further, the control unit 31 of the present copying machine not only obtains various information such as the speed, position and acceleration of the coil unit 102 from the digital pulse V _OUT , but also operates abnormally from the duty ratio of the digital pulse V _OUT. Is detected,
A warning message such as "service required" is displayed on the display unit 33 provided in the copying machine main body 1.
That is, the duty ratio calculation means, the duty ratio determination means,
It also has a function as a first warning means.

FIG. 8A shows respective waveforms when the output from the magnetic scale pickup element 111 is normal and abnormal. FIG. 7B shows the digital pulse V _OUT (A) when the output from the magnetic scale pickup element 111 is normal, and FIG. 7C shows the case where the output from the magnetic scale pickup element 111 is abnormal. Digital pulse V _OUT (B). As can be seen from the figure, when the output of the magnetic scale pickup element 111 is normal, the H-level duty width D ₁ and the L-level duty width D ₂ have the same width, and the duty ratio (D ₁ / D
₂ ) is about 0.5.

On the other hand, the magnetic scale pickup element 1
When the output of 11 becomes unstable for some reason and is abnormal, the duty width D _{1 of} H level and the duty width D ₂ of L level are not the same width, and the duty ratio (D ₁ / D
₂ ) deviates greatly from about 0.5. Therefore,
As described above, in the control section 31 of the copying machine, the duty ratio (D ₁ / D ₂ ) is within the specified range when the duty ratio is 0.4 <D ₁ / D ₂ <0.6, and the duty ratio is within this range. When it deviates, it is determined to be a trouble, and an abnormal operation is detected from the duty ratio of the digital pulse V _OUT .

However, in this case, the digital pulse V
_In detecting the rising edge of _OUT and obtaining information such as speed and position, the cycle does not change in either V _OUT (A) or V _OUT (B), and the cycle of V _OUT (A) T = V _OUT
Since it becomes the period T'of (B), no direct trouble occurs. Therefore, by distinguishing from an important trouble such as stopping the copying operation, a "service man required" is displayed while performing the copying operation. You can deal with it.

As described above, in the copying machine of this embodiment, since the optical system driving device 3 is provided with the magnetic scale 109 for linear position detection, this magnetic scale 109 is used.
By using, it is possible to obtain highly accurate position information of the linear motor 103, and highly accurate speed control becomes possible.
Moreover, since the magnet portion 107 and the magnetic scale 109 are integrally used via the magnetic shield member 108 as the guide shaft 101 of the mirror bases 10 and 11, both are integrally formed by the interposed magnetic shield member 108. Magnetic pickup does not occur even when it is formed as, and the magnetic scale pickup element 111 can detect the signal from the magnetic scale 109 without being affected by the strong magnetic field of the magnet unit 107, and Although the weight of the magnetic shield member 108 is increased as compared with the configuration in which 109 is attached separately from the magnet portion 107, further space saving and weight reduction can be achieved.

Further, the duty ratio of the waveform width of the output of the magnetic scale pickup element 111 during driving is obtained, and it is judged whether or not the obtained duty ratio is within the specified range. In this case, since a message is displayed upon determining that the magnetic scale side is out of order, even if the magnetic scale 109 causes magnetic interference due to some reason such as contact with the magnetizing driver or change over time, characteristic deterioration will occur at all. At the stage before the output from the magnetic scale pickup element 111 is no longer obtained, it is possible to predict the occurrence of an abnormality and deal with a serviceman call or the like. Therefore, it is possible to avoid the situation in which the apparatus function is stopped due to a failure and the copying operation cannot be performed, the downtime of the apparatus is reduced, and the operation rate of the apparatus can be improved.

[Embodiment 2] Another embodiment of the present invention will be described below with reference to FIGS. 6, 9 and 10. For convenience of explanation, members having the same functions as the members shown in the above embodiment are designated by the same reference numerals,
The description is omitted.

The control unit 35 of the copying machine according to the present embodiment shown in FIG. 6 is the first unit from the magnetic scale pickup element 111, which is performed by the control unit 31 of the copying machine according to the embodiment.
In addition to the warning operation of detecting an abnormality from the duty ratio of the digital pulse V _OUT of the pulse signal and displaying "service required", the digital pulse V _OUT of the first pulse signal and the stator pickup element 110 The digital pulse V _OUT of the second pulse signal is read, an abnormality is detected as described below, and a warning message or the like is displayed on the display unit 33 to notify the user of the abnormality. Further, in this case, it is judged that the trouble is serious and the copying operation is stopped to maintain the copying machine. That is, the control unit 35 has a function as a first frequency determination unit, a second frequency determination unit, and a second warning unit.

For example, the first pulse signal from the magnetic scale pickup 111 as shown in FIG. 9A and the stator pickup element 11 as shown in FIG. 9B.
It is assumed that the second pulse signal from 0 is obtained. In the above, when outputting the pulse signal as shown in the section F,
Both the first and second pulse signals are normal, and the frequency is within the specified range. When such a pulse signal is detected, the control unit 35 determines that the machine is operating normally and continues the copying operation.

On the other hand, when the pulse signal as shown in the section G is output, the second pulse signal is normal, but the frequency of the first pulse signal is out of the specified range (the pulse signal is not output in the figure. State), that is, the linear motor 10
3 operates and the mirror bases 10 and 11 are moving, but the position information of the magnetic scale 109 cannot be read. When such a pulse signal is detected, the control unit 35 determines that the magnetic scale 109 has a failure, displays a message such as "magnetic scale side failure" on the display unit 33, and stops the copying operation. It is supposed to do.

When the pulse signal as shown in the section J is output, both the first pulse signal and the second pulse signal are abnormal, and the frequencies of both are out of the specified range (the pulse signal is not output in the figure. State), that is, a trouble on the motor drive unit such as a lock of the linear motor 103, for example. Therefore, when such a pulse signal is detected, the control unit 35 determines that the drive unit has a failure, displays a message such as "optical system drive unit failure" on the display unit 33, and copies it. It is supposed to stop working.

To carry out such a trouble check measurement mode, the copying operation is started, the mirror bases 10 and 11 start scanning, and the first pulse from the magnetic scale pickup 111 provided in each coil unit 102. The signal and the second pulse signal from the stator pickup element 110 start to rise and fall, and are formed only in a section where the period T ₁ · T _{2 of} each pulse signal is originally stable after a certain time has elapsed after the start of scanning. It

Next, the control procedure will be described with reference to the flowchart of FIG. 10. When the trouble check measurement mode is executed, first, the timer T _{1 is set} to 0 in order to measure the period of the first pulse signal. The first pulse signal is set (S1), the first pulse signal is detected (S2), and if it is detected, it is determined whether the measurement mode is not ended (S3). If the measurement mode is not ended, the process returns to S1.

On the other hand, if the first pulse signal cannot be detected in S2, it is judged whether it is within the specified time A (S4). If it is within the specified time A, the time is counted (S5), and S
Return to 2.

If the specified time A is exceeded in S4, the second
The pulse signal measurement routine is executed to measure the second pulse signal (S6). The measured value T of the obtained second pulse signal
₂ is compared with the specified time B of the second pulse signal (S
7) If it is within the specified time B, it is determined that there is a trouble on the magnetic scale side (S8), and a message such as "magnetic scale side abnormality" is displayed on the display unit to inform the abnormality on the magnetic scale side (S9). , Stop the copying operation (S1
2), the process ends.

If the specified time B is exceeded in S7,
It is determined that there is a trouble on the motor drive side (S1
0), a message such as "optical system drive unit side abnormality" is displayed on the display unit to inform the drive unit side abnormality (S11), the copying operation is stopped (S12), and the process is terminated.

Such measurement / judgment is repeated until the end of the measurement mode is confirmed in S3, and when the end of the measurement mode is confirmed in S3, the process ends. Normally, such a trouble check measurement mode is executed only when a stable speed is maintained during scanning, and the above-mentioned first pulse is used in each operation of variable magnification copy and feed / return. The specified times A and B of the signal and the second pulse signal may be set appropriately.

In general, during scanning of the optical system, rising immediately after start and braking (falling) immediately before stop.
At times, the speed is naturally not stable and the measurement mode cannot be executed.

As described above, in the copying machine of this embodiment, it is determined whether or not the frequency of the first pulse signal, which is the output of the magnetic scale pickup element 111, is within the specified range, and the frequency is outside the specified range. Then, the frequency of the second pulse signal that is the output of the stator pickup element 110 is monitored to determine whether this frequency is within the specified range, and if it is within the specified range, the magnetic scale On the other hand, if it is outside the specified range, it is judged as a failure of the motor drive system, and a message to that effect is displayed according to each failure, so the device itself fails. The places are limited. Therefore,
Even if the device function is stopped due to a failure, repairs will be easier, the burden on the service person will be reduced, the downtime of the device will be reduced, the operating rate of the device will be improved, and the serviceability will be improved. it can. [Embodiment 3] Another embodiment of the present invention will be described with reference to FIGS.
The description will be made based on 1. For convenience of explanation, members having the same functions as the members shown in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the control section 31 of the copying machine of the above-mentioned embodiment, the output of the magnetic scale pickup element 111 is the first
When an anomaly is detected from the duty ratio of the digital pulse V _OUT of the pulse signal, the message “service man required” is displayed immediately. However, if this is done, the signal waveform will be misaligned even once even due to electrical noise or the like. Since "service person required" is displayed, the reliability of the user's device is reduced and a great burden is imposed on the service person.

Therefore, the copying machine of the present embodiment is constructed by paying attention to this point because the deviation of the duty ratio is repeated any number of times if there is a physical abnormality, not electrical noise or the like. The control unit 36 counts abnormalities in the duty ratio as will be described later, and when a predetermined number of times is reached, a warning operation is performed. As a result, it is possible to suppress the probability of erroneous display, that is, the control unit 36 also has a function as counting means.

Further, in the control section 36 of this copying machine, the abnormality determination range is set in two stages. For example, if it is within the first abnormality determination range where the abnormality is light, it is determined that there is a trouble after counting the pulse signals of the abnormal duty ratio of n ₁ times, "service man required" is displayed, and the first range is displayed. If the second abnormality determination range has a large abnormality exceeding n _2, it is sufficiently smaller than n ₁ which is the number of counts of the first abnormality range, n ₂
Just counting the number of times determines that there is a problem and displays "Service required". As a result, in the case where the sensor failure is progressing and there is no time to complete the failure, a serviceman can be called early and repair can be performed in the light failure.

In the copying machine of this embodiment, 0.4 <D ₁ /
Normal range when D ₂ <0.6, 0.2 <D ₁ / D ₂ ≤ 0.4
When 0.6 ≦ D ₁ / D ₂ <0.8, the first abnormality range (first abnormality determination range), further, 0.2 ≧ D ₁ / D ₂ and 0.8 ≦ D ₁ / D ₂
Is the second abnormality range (second abnormality determination range), and n ₁
The number of times is set to 10 times and the number of times n ₂ is set to 2 times.

As in the second embodiment, the trouble check measuring mode is executed only in a section where the copying operation is started and the periods T ₁ and T _{2 of the} pulse signals are originally stable. ing.

Explaining based on the flowchart of FIG. 11, when the trouble check mode is executed, first,
The timer D ₁ is set to 0 to measure the H level duty width (S21). Next, the rising edge of the pulse indicated by the arrow a in FIG. 8A is detected (S22), and the falling edge of the pulse indicated by the arrow b in the figure is detected in S23,
The timer D ₁ is counted up (S24).

When the trailing edge is detected in S23, the timer D ₂ is set to 0 to measure the duty width of the L level (S25), and the leading edge of the pulse indicated by the arrow a'in FIG. The timer D ₂ is counted up until it is detected (S27).

When the rising edge of the pulse is detected in S26, the duty ratio D ₁ / D ₂ , which is the ratio of the measured values D ₁ and D ₂ of the timer, becomes 0.4 <D ₁ / D ₂ <0.6. It is determined whether or not it is within the range (S28), and if it is within the range, the process returns to S21 and the next pulse is measured in the same manner.

On the other hand, if it is outside the range of 0.4 <D ₁ / D ₂ <0.6, in S29 and S30, 0.2 <D ₁ / D ₂ ≦ 0.4 and 0.4.
It is determined whether or not it is within the first abnormal range of 6 ≦ D ₁ / D ₂ <0.8, and if it is within the range, the counter of the abnormal pulse counter N ₁ is incremented by 1 (S31). As a result, it is determined whether or not the total count number N ₁ so far is 10 or less (S32), and if 10 or less, the process returns to S21,
If the number exceeds 10, the message "Service Required" is displayed (S35), and the process ends.

In the above S29 and S30, 0.2 <D ₁ / D ₂
If it is determined that the first abnormal range of ≦ 0.4 and 0.6 ≦ D ₁ / D ₂ <0.8 is not satisfied, that is, 0.2 ≧ D ₁ / of the second abnormal range.
Is either D ₂ and 8 ≦ D ₁ / D _2. Therefore, S
At 33, the counter of another counter N ₂ is incremented by 1 (S31). As a result, it is determined whether or not the total number of counts N ₂ so far is 2 or less (S 34), and if it is 2 or less, the process returns to S 21 and if it exceeds 2, “Service required” is displayed (S 35). ), The processing ends.

As described above, in the copying machine of the present embodiment, when the duty ratio judging means judges that the duty ratio is out of the specified range, the pulse signal with the abnormal duty ratio is counted, and the count number is counted. When the number of times reaches a predetermined number, the warning operation is performed by judging the failure on the magnetic scale side.Therefore, when issuing a warning, for example, a duty ratio abnormality due to an abnormality such as a failure, and a non-failure electrical It is possible to distinguish the duty ratio abnormality due to noise or the like, and it is possible to carry out a more accurate warning operation with less error. As a result, false alarms can be prevented, the reliability of the user's device can be improved, the burden on the service person can be reduced, and unnecessary downtime of the device can be suppressed, thereby increasing the operating rate. Can be improved.

Moreover, as described above, as the abnormal range of the duty ratio, two stages, that is, the first abnormal range close to the specified range and the second abnormal range further out of the specified range are set, and it is judged to be the second abnormal range. Then, the warning operation is performed with a count number smaller than the reference count number for determining a failure on the magnetic scale side in the first abnormal range, so that the duty ratio largely shifts, that is, the failure state. If the stage immediately before is detected, the warning operation will be carried out without any delay, and further, the warning operation can be carried out at a better timing, which is more reliable.
A device that does not easily break down can be realized.

[Embodiment 4] Another embodiment of the present invention will be described with reference to FIGS. 4, 12, 13, 14, 15, 15, 16 and 22.
The explanation is based on the following. For convenience of explanation, members having the same functions as the members shown in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the method according to the first aspect, the polarity of the magnet portion 107 of the guide shaft 101 is detected by the stator pickup element 110, and the pulse is applied to each of the transistors X, Y, Z by the distribution element in the drive circuit.
Three coils U, V, W by turning U, V, W ON / OFF
The direction of the current flowing through the coil unit 102 was switched to continuously operate the coil unit 102. However, in this embodiment, the current switching is performed by the magnetic scale pickup element 111 instead of the stator pickup element. Therefore, the stator pickup element 110 becomes unnecessary (see FIG. 12). The block diagram of the control system is as shown in FIG.

FIG. 15 shows an arrangement example of the coil unit 102 and the magnetic scale pickup element 111 (U, V, W3).
Phase), U-, V-, W-, X-, Y-, and Z-transistor ON timings in 2-phase excitation, UVW-phase motor currents, and magnetic scale output pulse timings. Here, in FIG.
The coil unit 102 located at the position a in FIG.
4 (b) shows the case of driving to the position b by two-phase excitation. In this case, the phase of the motor drive current is changed by changing the combination of ONTRs in the drive circuit 32 every N times the scale output pulse is counted. Switch over. Here, from the linear scale output pulse, the drive unit transistor U,
In order to turn on V, W, X, Y, and Z at a predetermined timing, the linear scale output pulse is fetched into the CPU 31 via the waveform shaping circuit 112 or the like, pulse counting is performed, and U, V, W is passed through a driver or the like at a predetermined timing. , X, Y,
There is a method of turning on the Z transistor (Fig. 16 (a)).
reference). In this method, the pulse count and timing are C
Since the PU 31 processes, the number of circuit components is reduced as compared with the conventional method. To reduce the software load and CPU processing, refer to FIG.
A counter circuit will be added as shown in (b). In this case, the CPU 31 can also directly control the motor.

An outline of the operation of this embodiment will be described with reference to the flowchart of FIG.

The circuit is of the type shown in FIG. 16A and is of a three-phase, two-pole and two-phase excitation method.

First, the pulse counter value C is cleared in (1-1), and the transistors U and Y are turned on in (1-2). Then, a current flows through the U-phase and V-phase coils. As a result, the U-phase coil becomes the N pole and the V-phase coil becomes the S pole.
The coil unit 102 moves due to the force in the arrow direction. Next, in (1-3), the output pulse from the linear scale 111 is read until the pulse count reaches N. In the example of FIG. 15, counting is performed in synchronization with the rising edge of the pulse. Next, in (1-5), the transistors U and Z in FIG. 4 are turned on. Then, as in the previous time, currents flow in the U-phase and W-phase coils and force is applied in the same direction to continue the movement. Similarly, V, Z → V, X →
The coil unit moves in the same direction by switching on the transistors W, X → W, Y every N pulse counts.

[Embodiment 5] Another embodiment of the present invention is shown in FIG.
7. The following is a description with reference to FIG.
For convenience of explanation, members having the same functions as the members shown in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In this embodiment, the linear scale 11
A case where an optical sensor is used as 09 is shown. In this case, the magnetic shield member becomes unnecessary, and the area occupied by the magnet in the guide shaft increases. The outline is shown in FIG.

In this embodiment, a linear scale (optical type) 1
This is a method in which the light is reflected by 109 and the light receiving and emitting elements (111a, 111b) to read, and in FIG.
A drive signal is output from 1 to the light emitting element 111a to cause the light emitting element 111a to emit light. Next, the light from the light emitting element 111a is transmitted to the linear scale 1109 on the magnet unit 107.
It is reflected by and is input to the light receiving element 111b. Light receiving element 11
A pulse signal of High / Low is output from 1b, shaped by the waveform shaping circuit 112, and input to the CPU 31. Although the linear scale pulse is obtained by reflection in this embodiment, a transmission type may be used. (The operation flowchart is the same as that in FIG. 22 and therefore its explanation is omitted.) [Embodiment 6] The following will describe another embodiment of the present invention in reference to FIG. For convenience of explanation, members having the same functions as the members shown in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The present embodiment is characterized in that the outer surface of the coil type mover is wrapped with a material having a high magnetic permeability to form a magnetic circuit to realize a highly efficient linear motor drive. 19 (a), (b), and (c) show the outline. As a structure, the guide shaft 101 has a U phase and a V phase.
There are respective phase and W-phase coil units 102, an optical linear scale 1109 is arranged, and a magnetic shield material 120 is provided so as to wrap the entire outer surface thereof. Magnetic shield material 1
20 is made of a material having a high magnetic permeability, and since a magnetic circuit is formed in the outer peripheral portion of the coil unit 102, leakage magnetic flux is eliminated, so that magnetic interference to the outside can be prevented and the magnetic flux can be effectively used. The linear scale sensor 1110 is an optical type. The operation flowchart and the circuit operation are the same as those in the fifth embodiment, and the description thereof will be omitted.

[Embodiment 7] Another embodiment of the present invention will be described with reference to FIG.
It will be described below based on 0. For convenience of explanation, members having the same functions as the members shown in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In this embodiment, at the boundary where the polarity of the magnet-type stator changes from the N pole to the S pole and from the S pole to the N pole, the magnet shape is made to be an oblique direction rather than a direction perpendicular to the longitudinal direction of the guide shaft. In the magnet type stator that is skew-magnetized, the linear scale 1109 is installed so as to pass through the center portion (the center portion of the guide axis width perpendicular to the longitudinal direction of the guide axis) of the boundary of the magnet type stator. It is characterized in that it is installed, and skew magnetization is performed with the stator magnet 107 side inclined.
A skew method in which the coil unit 102 side is inclined with respect to the stator magnet 107 may be used. FIG. 20 shows one of the present examples. The magnetization of the stator magnet 107 is inclined at an angle with respect to the longitudinal direction of the guide shaft 101. The linear scale 1109 may be a magnetic scale or an optical scale, and a pickup is arranged near the coil 102a. In addition, the linear scale 1109
It is installed so as to pass through the center of the width of the guide shaft 101 in the lateral direction. As a result, cogging torque is reduced, position accuracy is improved, phase switching timing deviation is prevented, and noise is reduced. Since the operation flow and circuit connection are the same as those in the fourth and fifth embodiments, description thereof will be omitted.

[Embodiment 8] Another embodiment of the present invention will be described with reference to FIG.
1, it will be described below with reference to FIG.
For convenience of explanation, members having the same functions as the members shown in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the present embodiment, the coil type mover reads out a pulse signal corresponding to the output of the linear scale sensor during the uniform linear motion, and the period (frequency) of the pulse in the previous measurement and the current measurement. Alternatively, it is characterized in that it has means for judging whether the duty ratio has changed by a predetermined value or more, and if it is judged by this judging means that the duty ratio has changed by more than a predetermined value, it is judged that the linear scale unit has failed and a warning operation is performed. The linear scale trouble detection method will be described.

21 (a) and 21 (b) show examples of output pulses from the linear scale pickup.

In the present embodiment, the pulse period is detected by detecting the rising edge of the pulse, the interval between them is measured by a timer, and the normal period is judged by comparing with the reference period.
Regarding the duty ratio, the rising edge and the next falling edge are detected, and the time between them is measured by a timer and compared with the reference period to determine whether the duty ratio is normal.
Next, the embodiment will be described with reference to FIG.

First, at (2-2), the rising edge of the output pulse from the linear scale pickup is detected, and at the same time, at (2-3), the timer is cleared. Immediately (2-
In 4), the timer is turned ON (start) to detect the next falling edge. If the respective times are T ₁ and T ₂ , the “H” level time is T ₂ −T ₁ , and if the reference period is T, then D _H = (T ₂ −T ₁ ) / T × 100 is at the “H” level. The duty ratio is. Even if it is confirmed whether _DH is within the predetermined range in (2-7), it is not within the predetermined range (2-14).
Trouble display, (2-15) stop, (2-1
Return in 6). If the predetermined range further 'to calculate the (T' period T performs rising edge detection = T ₃ -T _1).
Next, at 2-10, it is confirmed whether T'is within the predetermined range. If it is not within the predetermined range, the trouble is dealt with in the same manner. If it is within the predetermined range, the timer is cleared again (2-11), and the above operation is repeated until the end of the operation (2-13). Although here seeking D _H = T ₂ -T ₁ as duty calculation, which is performed by looking at the pulse width during High is in pulse period. In practice, the duty ratio at the time of _{High D H = (T 2 -T} 1) / (T 3 -
T ₁ ) × 100 Low 〃 D _L = (T ₃ −T ₂ ) / (T ₃ −
It is calculated as T ₁ ) × 100.

[Embodiment 9] Another embodiment of the present invention will be described with reference to FIG.
The following is a description based on item 4. For convenience of explanation, members having the same functions as the members shown in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In this embodiment, the judging means of the eighth embodiment can judge whether it is the first abnormality judgment range close to the specified range or the second abnormality judgment range further out of the first abnormality judgment range.
The first warning means, when the determination means determines that the range is the second abnormality determination range, performs a warning operation with a count number smaller than the count number that is determined to be a failure of the linear scale when the determination range is within the first abnormality determination range. A linear scale trouble detection method characterized by being carried out will be described.

The operation will be described with reference to FIG. C is the count value of the number of times the pulse cycle is in the first abnormal range.
₁ and the limit value of the count value is C ₁ ′ (that is, C _1).
Trouble occurs when ≧ C ₁ ′). The count value of the number of times in the second abnormal range is C _2, and the limit value of the count value is C ₂ ′.
And Similarly, the number of times the pulse duty (here, for simplicity, obtained by D _H = T ₂ −T ₁ as described above) is within the first abnormal range is C ₃ , the limit value is C ₃ ′, and the second is The count value in the abnormal range of C ₄ is C ₄ , and the limit value is C ₄ ′.

From the contents of the claims, C ₁ ′> C ₂ ′, C ₃ ′
> C ₄ ′.

First, in 3-2, C _{1 to} C ₄ are set to 0, and rise detection is performed in 3-3. As soon as it is detected, the timer is cleared and the timer is started. Next, by detecting the falling edge, the duty D _H = T ₂ −T ₁ is obtained (3-5, 3
-6), and compare whether _DH is within a predetermined range (3-7). If it is within the predetermined range, the next rising edge is detected and the pulse cycle is calculated (3-8, 3-9). (3-
In 10), it is compared whether the cycle T is within a predetermined range. If it is within a predetermined range, the timer is cleared and the above operation is performed until the operation of the linear motor is completed. In (3-7), if _DH is not within the predetermined range, it is classified in (3-14, 3-20) whether it is the first or second abnormal range. If within each range, count up C ₃ and C ₄ (3-16, 3-2
In 2), check whether each count limit has been reached. If the limit value is not reached, move to (3-8) and continue the operation. In addition, when each becomes more than the limit value,
The trouble display is stopped at (3-26, 3-27, 3-28), and the process returns.

The operation of (3-10, 3-17, 3-23) is similar to the above operation, and therefore its explanation is omitted.

[Embodiment 10] Another embodiment of the present invention will be described below with reference to FIGS.
For convenience of explanation, members having the same functions as the members shown in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In this embodiment, the linear scale sensor output corresponding to the linear motor drive current phase switching portion of the linear scale and the intermediate point therebetween is not subjected to the trouble detection described in the eighth and ninth embodiments. The linear motor drive trouble detection method is characterized in that the trouble is detected only in a portion excluding the above position.

The operation will be described with reference to FIG. This flowchart is shown in FIG. 22. When the output pulse from the linear scale pickup 1110 is counted and the U, V and W phase coils are energized, the pulse count value is N times or N / 2 times. The pulse trouble detection in 9 is not performed. In this embodiment, N, N
The control is performed only with / 2, but it may have a width such as N times pulse ± 5 times pulse. In FIG. 25, (4-28,
Trouble detection in 4-29, 4-30, 4-31, 4-32) indicates trouble detection in the eighth and ninth embodiments. First, C = 0 in (4-1), TRU in (4-2),
Turn Y on and perform pulse counting. C at (4-4)
If it is not = N, it is judged in (4-23) whether C = N / 2. If it is not C = N / 2, pulse trouble is detected in (4-28) and the process returns to (4-3). .

In (4-4, 4-23), C = N or C =
If it is N / 2, 4-28 trouble detection is not performed. As a result, the pulse trouble detection is performed by excluding the minimum and maximum torque portions in the torque ripple shown in FIG. The same processing is performed below for TRU / ZON and TRV / Z.
ON, TRV / XON, TRW / XON, TRW / YO
The operation of FIG. 25 is completed by performing the operation even when N is set.

The description of the same processing (4-5) and subsequent steps will be omitted.

[Embodiment 11] Another embodiment of the present invention will be described below with reference to FIG. For convenience of explanation, members having the same functions as the members shown in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the present embodiment, the output pulse from the linear scale is changed by changing the scale pitch on the linear scale corresponding to the phase switching portion of the linear motor drive current for energizing the movable element coil to the scale pitch other than that. It is a linear motor drive method that detects the phase switching timing from the linear motor drive control, and the driven body is a reflector holder that carries a light source lamp and a reflector for the original placed on the original table. It is characterized by being.

The operation will be described with reference to FIG. This flow realizes the same operation as in FIG. 22 by detecting the pulse width from the linear scale pickup 1110. (Pulse at the time of phase switching is changed to other) Therefore, the difference from FIG. 22 is that the phase switching of the currents to be passed through the U, V and W phase coils is performed by (5-3 to 5-5, 5-10).
5-12, 5-14 to 5-16, 5-18 to 5-20,
This is performed by detecting the pulse width in 5-22 to 5-24). First, start with (5-1) (5-2)
Then TRU, YON. Next, in (5-3), the pulse width of the linear scale pickup 1110 is detected. Next, it is checked whether the pulse width detected in (5-4) is the pulse width in standard time. If the pulse width is the above pulse width, (5-
Return to 3). If the pulse width is not the above pulse width, it is detected whether the pulse width is the pulse width at the time of phase switching. If it is not the pulse width at the time of phase switching, it is judged as a trouble and trouble display, stop, and return. If the pulse width is for phase switching, TRU and TRZ are turned on in (5-9).

Similarly, TRV, Z-TRV, X-TR
It becomes W, X-TRW, YON and returns to (5-2) if the operation is not completed. The pulse width for phase switching is preferably 40% to 60% of the standard pulse width as the phase switching detection width.

[0098]

As described above, the linear motion drive device according to the first aspect of the present invention is capable of sliding the coil type mover of the linear motor directly connected to the driven body and the coil type mover. And a magnet type stator of a linear motor which is set to match the longitudinal direction to the moving direction of the driven body, and a linear position is provided to a part of the magnet type stator via a magnetic shield part. A magnetic scale for detection is provided, and the magnet type stator, the magnetic shield part, and the magnetic scale are integrated to form a guide shaft for the carrier of the driven body, and the magnet type stator is provided in the vicinity of the coil type mover. The magnetic sensor for the stator that detects the polarity of the magnetic sensor and the magnetic sensor for the magnetic scale that reads the position information from the magnetic scale are provided.

As described above, the linear motion drive device according to the second aspect of the present invention is the linear motion drive device according to the first aspect, wherein the driven device is driven based on the output of the magnetic sensor for the magnetic scale. This is a configuration provided with speed control means for moving the body at a predetermined speed.

According to a seventh aspect of the present invention, there is provided the linear movement driving device according to the second aspect, wherein the driven body is an original document. This is a configuration of a reflecting mirror carrier that carries a light source lamp and a reflecting mirror for a document placed on a table.

Therefore, highly accurate position information of the linear motor can be obtained, and highly accurate speed control can be performed. Further, the magnet type stator and the magnetic scale can be used as a guide shaft for the carrier of the driven body. Since it is used integrally via the shield part, it is possible to detect the signal from the magnetic scale without being affected by the strong magnetic field of the magnet type stator, and to save space and reduce weight. It has the effect of being able to. Further, by applying the drive device for linear motion to the drive device of the optical system of the copying machine as in the structure of claim 7, it is possible to effectively prevent the deterioration of the image quality without causing the out-of-focus. There is an effect that can be.

As described above, the linear motion drive device according to claim 3 of the present invention is the linear motion drive device according to claim 2, wherein the waveform width of the output of the magnetic sensor for the magnetic scale is changed during driving. A duty ratio calculation means for obtaining the duty ratio, a duty ratio determination means for determining whether the duty ratio calculated by the duty ratio calculation means is within a specified range, and the duty ratio determination means for determining the duty ratio. When it is determined that is out of the specified range, it is determined that it is a failure on the magnetic scale side and a first warning means for performing a warning operation is provided.

Therefore, even when the magnetic scale causes magnetic interference due to contact with the magnetizing driver, magnetic interference due to some cause such as change with time, no output from the magnetic sensor for the magnetic scale can be obtained. At the previous stage,
It is possible to predict the occurrence of anomalies and take measures such as calling a service person. Therefore, for example, when the present device is applied to the optical system driving device of the copying machine as in the structure of claim 7,
There is an effect that it is possible to reduce the downtime of the apparatus and improve the operation rate of the apparatus by avoiding the situation that the apparatus function is stopped due to the failure and the copying operation cannot be performed.

As described above, the linear motion drive device according to claim 4 of the present invention is the linear motion drive device according to claim 2, wherein the first pulse corresponding to the output of the magnetic sensor for the magnetic scale is used. First frequency determining means for determining whether or not the frequency of the signal is within a specified range, and the first frequency determining means.
When the frequency determining means determines that the frequency of the first pulse signal is out of the specified range, the frequency of the second pulse signal according to the output of the magnetic sensor for the stator is monitored, and the frequency is within the specified range. If the second frequency determining means determines that the magnetic scale side is out of the specified range, the second frequency determining means determines whether the magnetic scale is out of the specified range. When the determination is made, it is determined that the motor drive system has failed, and the second warning means for performing a warning operation according to each failure is provided.

Therefore, the failure location is limited by self-diagnosis by the apparatus itself. Therefore, for example, when the present device is applied to the optical system driving device of the copying machine as in the structure of claim 7, even if the device function is stopped due to a failure, the repair is facilitated and the burden on the service person is reduced. In addition to reducing the downtime of the device and improving the operating rate,
Moreover, there is an effect that the serviceability can be improved.

As described above, the linear motion drive device according to the fifth aspect of the present invention is the linear motion drive device according to the third aspect, wherein the duty ratio is outside the specified range by the duty ratio determination means. If it is determined that there is a counting means for counting pulse signals with an abnormal duty ratio, the first warning means, when the count number reaches a predetermined number, determines that the magnetic scale side has failed and performs a warning operation. Is a configuration for implementing.

Therefore, when issuing a warning, it is possible to distinguish between an abnormality in the duty ratio due to an abnormality such as a failure and an abnormality in the duty ratio due to an electrical noise that is not a failure, and in addition to the effect of the configuration of claim 3, more accurate A warning operation with few mistakes can be implemented. Therefore, for example, by applying to the optical system driving device of the copying machine having the structure of claim 7, false alarm can be prevented, the reliability of the user's device can be improved, and the burden on the service person can be reduced. ,
Moreover, by suppressing the occurrence of unnecessary downtime of the device,
The effect is that the operating rate can be improved.

As described above, the linear motion drive apparatus according to the sixth aspect of the present invention is the linear motion drive apparatus according to the fifth aspect, wherein the duty ratio determining means calculates the duty ratio by means of the duty ratio calculating means. It is determined whether or not the determined duty ratio is within the specified range, and if it is outside the specified range, the first abnormality determination range close to the specified range or the second abnormality further outside the first abnormality determination range. The first warning means determines whether the magnetic field is within the first abnormality determination range when the duty ratio determination means determines that it is within the second abnormality determination range. This is a configuration in which the warning operation is performed with a count number smaller than the reference count number for determining a failure on the scale side.

Therefore, the duty ratio is greatly deviated,
That is, when the step immediately before the failure state is detected, the warning operation is executed without any delay, and in addition to the effect of the above-mentioned claim 5, the warning is issued at a more excellent timing. The operation can be performed. Therefore,
For example, by applying the present invention to an optical system driving device such as a copying machine as in the case of the structure of claim 7, it is possible to realize a device having higher reliability and less likely to break down.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, in which (a) is a perspective view showing a schematic configuration of an optical system driving device,
(B) is a partial cross-sectional side view showing a main part of a driving unit of the optical system driving device.

FIG. 2 is a schematic configuration diagram of a copying machine including the optical system driving device.

FIG. 3 is a sectional view of a guide shaft that constitutes the optical system driving device.

FIG. 4 is a circuit diagram of a drive circuit of the optical system drive device.

FIG. 5 is an explanatory diagram showing a positional relationship between a coil and a magnet section in the optical system driving device.

FIG. 6 is a block diagram showing a control system provided in the copying machine.

FIG. 7 is a circuit diagram showing a part of a waveform processing circuit.

8A to 8C are waveform diagrams,
(A) shows respective waveforms when the output from the magnetic scale pickup element is normal and abnormal, and (b) is
The waveform of the digital pulse V _OUT (A) when the output from the magnetic scale pickup element is normal, and the waveform (c) of the digital pulse V _OUT (B) when the output from the magnetic scale pickup element is abnormal. Is.

9A and 9B are diagrams showing waveforms of pulse signals, in which FIG. 9A is a first pulse signal from a stator pickup element, and FIG. 9B is a second pulse signal from a magnetic scale pickup element. belongs to.

FIG. 10 is a flowchart showing a processing procedure of a trouble check mode according to a second warning operation.

FIG. 11 is a flowchart showing a processing procedure of a trouble check mode according to a first warning operation.

FIG. 12 is a partial cross-sectional side view showing a main part of a driving unit of an optical system driving device showing another embodiment of the present invention.

FIG. 13 is a block diagram of a control system showing another embodiment of the present invention.

FIG. 14A is an explanatory diagram showing a positional relationship between a coil and a magnet section in the optical system driving device. (B) It is explanatory drawing which shows the positional relationship of the coil and magnet part in the said optical system drive device.

FIG. 15 is an explanatory diagram showing a relationship between an ON timing of a transistor and a magnetic scale output pulse.

16 (a) is a block diagram of driving a transistor from a linear scale output pulse. FIG. (B) It is a block diagram which drives a transistor from a linear scale output pulse.

FIG. 17 is a partial cross-sectional side view showing a main part of a driving unit of an optical system driving device showing another embodiment of the present invention.

FIG. 18 is an explanatory diagram of inputting a linear scale output pulse to a control unit.

FIG. 19 (a) is a partial cross-sectional side view showing a main part of a driving section of an optical system driving device showing another embodiment of the present invention. (B) It is sectional drawing in (a). (C) It is a partially enlarged view in (a).

FIG. 20 is a partial cross-sectional side view showing a main part of a driving unit of an optical system driving device showing another embodiment of the present invention.

FIG. 21 (a) is a diagram showing a waveform of an output pulse of a linear scale pickup. (B) It is a figure showing the waveform of the output pulse of a linear scale pickup.

FIG. 22 is a flowchart showing the operation of the present invention.

FIG. 23 is a flowchart showing the operation of the present invention.

FIG. 24 is a flowchart showing the operation of the present invention.

FIG. 25 is a flowchart showing the operation of the present invention.

FIG. 26 is a flowchart showing the operation of the present invention.

[Explanation of symbols]

1 Copying Machine Main Body 2 Optical System 3 Optical System Driving Device 4 Copy Lamp (Light Source Lamp) 5-8 Reflecting Mirror 10/11 Mirror Base (Reflecting Mirror Carrier) 31 Control Unit (Speed Control Means / Duty Ratio Calculating Means / Duty Ratio) Discrimination means / first warning means) (CP
U) 35 control unit (speed control means, duty ratio calculation means, duty ratio determination means, first warning means, first frequency determination means, second frequency determination means, second warning means) (C
PU) 36 control unit (speed control means, duty ratio calculation means, duty ratio determination means, first warning means, counting means) (CPU) 101 guide shaft (bearing member guide shaft) 102 coil unit 102a excitation coil (coil) Type mover) 103 linear motor 107 magnet member (magnet type stator) (stator magnet) 108 magnetic shield part (magnetic shield part) 109 magnetic scale 110 stator pickup element 111 magnetic scale pickup element 111a light emitting element 111b light receiving element 112 Waveform Processing Circuit (Waveform Shaping Circuit) 113 Waveform Processing Circuit (Waveform Shaping Circuit) 120 Magnetic Shielding Plate 1109 Linear Scale Sensor 1110 Linear Scale (Linear Scale Pickup)

Claims (7)

[Claims] 1. A coil type movable element of a linear motor directly connected to a driven body, and a coil type movable element which slidably penetrates through the coil type movable element and is set with its longitudinal direction aligned with the moving direction of the driven body. And a magnet type stator of a linear motor, wherein a magnetic scale for linear position detection is provided in a part of the magnet type stator via a magnetic shield part, and the magnet type stator,
A magnetic shield part and a magnetic scale are integrated to form a guide shaft for the carrier of the driven body, and a magnetic sensor for a stator for detecting the polarity of the magnet type stator and a magnetic scale are provided in the vicinity of the coil type mover. And a magnetic sensor for a magnetic scale for reading position information from the linear movement drive device. 2. The linear motion drive apparatus according to claim 1, further comprising speed control means for moving the driven body at a predetermined speed based on the output of the magnetic sensor for the magnetic scale. 3. A duty ratio calculating means for obtaining a duty ratio of a waveform width of a magnetic sensor output for a magnetic scale during driving, and whether the duty ratio calculated by this duty ratio calculating means is within a specified range or not. A duty ratio determining means for determining whether or not, and a first warning means for performing a warning operation by determining that the magnetic scale side is out of order when the duty ratio determining means determines that the duty ratio is out of the specified range. 3. The linear movement drive device according to claim 2, further comprising: 4. A first frequency determining means for determining whether or not the frequency of the first pulse signal according to the output of the magnetic sensor for a magnetic scale is within a specified range, and the first frequency determining means. When it is determined that the frequency of the first pulse signal is out of the specified range, the frequency of the second pulse signal according to the output of the magnetic sensor for the stator is monitored and whether or not this frequency is within the specified range. And a second frequency determining means that determines that the magnetic scale side is out of order while the second frequency determining means determines that the magnetic scale side is out of order. The second warning means for determining a failure of the motor drive system and performing a warning operation according to each failure.
A drive device for linear movement as described. 5. When the duty ratio determination means determines that the duty ratio is out of a specified range, the duty ratio determination means includes counting means for counting pulse signals with an abnormal duty ratio, and the first warning means has a count number of 4. The linear motion drive device according to claim 3, wherein when the predetermined number of times is reached, it is determined that the magnetic scale side has failed and a warning operation is performed. 6. The duty ratio determining means determines whether or not the duty ratio calculated by the duty ratio calculating means is within a specified range, and when the duty ratio is outside the specified range, the duty ratio is close to the specified range. It is configured to determine whether the first abnormality determination range is within the first abnormality determination range or the second abnormality determination range further out of the first abnormality determination range. 6. When the range is determined, the warning operation is performed with a count number smaller than the reference count number for determining the failure on the magnetic scale side when the range is the first abnormality determination range. Drive for linear motion of. 7. The driven body is a reflecting mirror carrier which carries a light source lamp and a reflecting mirror for a document placed on a document table. 5. The drive device for linear movement according to 5 or 6.