JPS62270937A - Scanner - Google Patents

Abstract

PURPOSE:To freely move a moving body in the advance or backward direction even if a device is stopping, and to easily execute a maintenance work, by providing a clutch between a driving means and the moving body. CONSTITUTION:An electromagnetic clutch 71 which is interposed and installed between a driving shaft of a constant speed motor 39 and a pulley 42 of this motor is always conducted electrically at the time of a usual copying operation and in an on-state, and connects the constant speed motor 39 and the pulley 42. However, when a service man, etc. execute a maintenance, said clutch becomes off by interlocking with a door switch, etc., detaches the constant speed motor 39 and the pulley 42. In such a way, when the service man executes a maintenance, the clutch 71 detaches the constant speed motor 39 from an output side, therefore, even when the motors 39, 40 are stopping, the service man can bring a mirror base of a moving optical system 31 to a reciprocating motion manually, and a maintenance work can be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a scanning device for a movable object, which is used when reciprocating a moving optical system constituting a copying machine, a facsimile machine, etc. at high speed.

[Prior Art] FIG. 3 shows an example of the appearance of a main part of a drive mechanism of this type of conventional scanning device, and FIG. 4 shows an example of the configuration of its electric circuit system. In FIG. 3, lO is 1.0, which will be described later. This is a drive pulley that is rotationally driven by a second drive means, and a wire 11 is wound around this drive pulley 10 .

This wire 12 is wound around pulleys 12 and 13 that are rotatably supported by the main body of the copying machine, and is further wound around a second pulley. 3rd mirror 1
It is wound so as to be folded back around a double pulley 17 which is rotatably supported by a support body (one mirror) 18 of 4.15, and both ends thereof are fixed to the main body.

On the other hand, the support for the first mirror X8 and the illumination lamp 19 (
(One Mira) 20 is the wire 1 mentioned above using the metal fitting 21.
It is fixed at 1. The above-mentioned supports 16 and 20 are slidably guided at one end by guide rods 22 and 23, respectively, and at the other end by a guide rail 24.
It is supported by rollers 25, 26 running above it.

In contrast, the second and third mirrors 14
．． 15 is moved back and forth at a moving speed of V/2.

For convenience of explanation, only one moving optical system 31 is shown in FIG. 4, which corresponds to one of the supports 16 or 20 supporting the mirror in FIG. 3 as a moving body, and the wire 32 is also endless. However, it actually corresponds to the drive mechanism of the reciprocating optical system shown in FIG.

As shown in FIG. 4, the drive pulley 33 is connected to an output pulley 35 via a wire 34. Moving optical system 31
A first driving means 3 with large inertia that drives the in one direction only.
6, and a second lens with small inertia that drives the moving optical system 31 back and forth.
The first driving means 26 is configured to drive the moving optical system 31 via a switching means 38.

The first and second drive means 36, 37 are each equipped with DC motors 39, 40 as drive motors, and the reciprocating motor 40 of the second drive means 37 is connected to the output pulley 35 via the drive shaft 4. is directly connected to. On the other hand, the constant speed motor 39 of the first drive means 36 is connected to a timing pulley 44 provided on the drive shaft 41 of the reciprocating motor 40 via a timing pulley 42 and a timing belt 43.
The timing pulley 44 is connected to the drive shaft 4 via a one-way clutch serving as a switching means 38.

Further, while a flywheel 47 is attached to the constant speed motor 39 of the first drive means 36, such a flywheel is not attached to the reciprocating motor 40 of the second drive means 37. Further, the first driving means 36 is set to have a large moment of inertia, and the second driving means 37 is set to have a small moment of inertia.

The configuration of the control circuit that controls the rotation of the constant speed reciprocating motors 39 and 40 described above is as described in the first section. The second driving means 36 and 37 are also the same, but the driving speed is the motor 40 of the second driving means 37.
is set higher.

51.52 is the reference pulse signal Sx+ +SX2 (S,
2 > S, l+), and is a reference oscillator that generates 53
．． 54 is a pulse encoder that generates pulses SMI+"M2 with a period corresponding to the rotation of the motors 3'l and 40.

Reference numerals 55 and 56 indicate phase detectors, and reference pulse signals 5Xll are output from the corresponding reference oscillators 51 and 52, respectively.
The phase error of SX2 and the motor rotation pulse signal 5141 obtained from the pulse encoder 53.54, sll+□ is detected, and the phase error signal P, , P is sent to the adder 57.58.
2 can be done manually.

59.60 is a frequency detector, which detects the motor rotation pulse signal SMl+ obtained from the pulse encoder 53.54.
Each of SM2 is subjected to frequency-voltage conversion (F/V conversion), and DC voltages V, V2 corresponding to the frequency of motor rotation pulses SM1+SM2 are input to adders 57 and 58. Note that a known rotational error detector integrated as an IC circuit including a phase detector and a frequency detector may be used.

51.62 is a low-pass filter, 63.64 is a power amplifier, and 65.65 is a drive circuit (driver) for driving the motor 39.40.

In the above configuration, the reference pulse signals Sx, , S, 2 and the motor rotation pulse signal S are detected by the phase detectors 55 and 58.
The phase error signal P, , P2 is added to the motor rotation pulse signal SMI +5M2 converted into a voltage by an adder 57. 64 and drivers 65 and 66, the constant speed motor 39 and the reciprocating motor 40 are driven. As a result, these motors 39 and 40 are each driven at a constant speed at a predetermined rotational speed designated by the reference pulse signal "Xl+SX2."

[Problems to be Solved by the Invention] However, in the conventional scanning device as described above, when the machine is stopped, a service person (maintenance manager) manually moves one mirror 16.20 in the forward direction during maintenance work, etc. Since the one-way clutch 38 automatically locks when it is desired to move, the first drive means 36 and the second drive means 37 are connected and cannot be moved manually.

That is, the reciprocating motor 40 always has one mirror 16.
Although the reciprocating motor 40 has a small gear ratio and small inertia, it is easy to move the reciprocating motor 40 by hand, but the constant speed motor 39 has a large gear ratio in its gear head, and the Since the wheel 47 is attached and the inertia is large, it becomes very heavy, and the motor 39 cannot be rotated by hand from the output side.

Furthermore, even if the motor 39 was forced to be rotated by hand, the movement of the single Mira (16.20 mm) was very slow and slow due to the large gear ratio. Moreover, at this time, the one-way clutch 38 for connecting the constant speed motor 39 and the reciprocating motor 40 is on the escape side, so the flywheel 47 must be rotated at the same time while pushing the Mira unit 16.20 toward the forward side. There was this difficulty.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and to provide a scanning device that allows one mirror to be freely moved forward or backward manually even when the machine is stopped.

[Means for Solving the Problems] In order to achieve the present object, the present invention provides a first drive means with relatively large inertia that drives the movable body only in one direction, and a first drive means with relatively large inertia that drives the movable body back and forth. In a scanning device equipped with a switching means for switching between a first drive means and a second drive means having a small
The present invention is characterized in that a clutch that can be opened when the device is stopped is provided between the driving means or the switching means and the moving body.

[Function] In the present invention, since a clutch is provided between the drive means and the movable body, the movable body can be freely moved forward or backward even when the device is stopped, making maintenance work easy. become.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the configuration of an embodiment of the present invention. Note that the same parts as in the conventional example shown in FIG. 4 are given the same reference numerals, and detailed explanation thereof will be omitted.

In FIG. 1, 71 is an electromagnetic clutch interposed between the drive shaft of the constant speed motor 39 and the pulley 42 of this motor.

The clutch 71 is always energized and in the ON state during normal copying operations, and connects the constant speed motor 39 and the pulley 42. However, when a service person or the like performs maintenance, it is turned off in conjunction with a door switch (not shown), etc., and the constant speed motor 39 and pulley 42 are turned off.

In this way, when a serviceman performs maintenance, the clutch 71 disconnects the constant speed motor 39 from the output side, so that the serviceman can operate one mirror of the moving optical system 31 even when the motors 39 and 40 are stopped. It can be moved back and forth manually, making maintenance work possible.

It should be noted that the clutch 71 is not necessarily limited to an electromagnetic clutch, and it is of course possible to use a known mechanical or hydraulic clutch that can be manually disconnected and connected by a service person or the like.

In this embodiment, a clutch 72 similar to the clutch 71 described above is provided between the one-way clutch 38 of the output shaft portion of the reciprocating motor 40 and the drive pulley 35. When the device is in the operating state, the motor 3 is connected via the clutch 72.
9 and 40 are connected to the drive pulley 35, but when the motor 39 and 40 are not in operation, the clutch 72 can disconnect the motor 39 and 40 and the drive pulley 35, so that the same effect as in the embodiment shown in FIG. 1 can be obtained. It will be done.

[Effects of the Invention] As explained above, according to the present invention, since the clutch is provided between the drive means and the moving body, the moving body can be freely moved forward or backward even when the device is stopped. Since it can be moved, maintenance work becomes easier.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of one embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of another embodiment of the present invention, and FIG. 3 is a perspective view showing an example of the appearance of main parts of a conventional device. FIG. 4 is a block diagram showing an example of the circuit configuration of a conventional device. 18.20...Support (one mirror), 35...Output pulley, 36...First drive means, 37...Second drive means, 38...Switching means (one-way clutch) ), 39...constant speed motor, 40...reciprocating motor, 41...drive shaft, 47...flywheel.

Claims (1)

[Claims] The first one has a relatively large inertia and drives the moving body only in one direction.
and a second drive means with relatively small inertia that reciprocates the movable body, wherein the first drive means or the switching means and the movable body A scanning device characterized in that it is equipped with a clutch that can be opened when the device is stopped.