JPH03184728A - Adjusting device for axial slippage of polyhedron - Google Patents

Abstract

PURPOSE:To easily and surely adjust the axial slippage of a polyhedron without damag ing the face of the polyhedron, by detecting the axial slippage based on the measure ment result by a distance measuring means and controlling a polyhedron moving means so that the center of the shaft to be fitted and the rotation center of the polyhe dron coincide. CONSTITUTION:The distance l1 from the center S1 of a motor shaft 10 to a face 11a and the distance l2 to a face 11d are divided, it is decided that there is a slippage in case of the distances l1 and l2 being not equal, the slipping direction and quantity are detected and stored in a memory part. A driving signal is then transmitted to a mirror moving means 13 from a control part with the detection of the axial slippage direction and quantity of a polygon mirror 11, the claw 31 of the head 32 held on an actuator 34 comes into the groove 30 of the mirror 11 as well and the mirror 11 is rotated at the specific angle so that the slipping direction of the mirror 11 and the moving direction of the actuator 34 may coincide. Thereafter the mirror 11 is moved in the half quantity of alpha in the specific direction, when a spindle 36a performs a telescopic motion to move an X stage 35 in the slipping direction in the half slipping quantity delta and the state of the center S1 of the motor shaft 10 and the rotation center S2 of the mirro 11 coincide becomes.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention adjusts the axis misalignment of a polygon, such as a polygon mirror used in a laser beam printer, with respect to a motor axis, which is an attached axis. The present invention relates to a polyhedral axis misalignment adjustment device.

(Prior Art) In recent years, laser beam printers have been widely used for output recording.

In laser beam printers, a polygon mirror is used to scan the laser beam at high speed, but there is a problem in that the polygon is misaligned with respect to the motor shaft to which it is attached, which greatly affects writing accuracy. .

Conventionally, the shaft misalignment was detected by intermittently rotating a polyhedron attached to the motor shaft and measuring each surface using a contact measuring device, and then manually adjusting the shaft misalignment. I was trying to do that.

However, since contact-type measuring instruments were used, there were serious problems such as damage to the reflective surface that was used as the measurement surface, as well as repeatability errors due to stroke movement when measuring each surface, and tactile pressure. There was a problem that measurement errors occurred due to

Furthermore, since the polyhedron is artificially moved based on the measurement results to adjust the axis misalignment, there are problems in that it takes a long time to adjust and the burden on the operator is extremely heavy.

(Problem to be Solved by the Invention) As described above, in the past, there was a problem in that it was not possible to easily and reliably adjust the misalignment of the polyhedron with respect to the attached axis without damaging each face of the polyhedron. .

The present invention has been made to solve the above problems, and its purpose is to provide a polyhedron that can easily and reliably adjust the axis misalignment of the polyhedron with respect to the attached axis without damaging the surface of the polyhedron. The present invention aims to provide an axis misalignment adjustment device.

[Structure of the Invention (Means for Solving the Problems) In order to solve the above problems, the present invention provides distance measuring means for measuring the distance to each face of a polyhedron attached to an attached shaft in a non-contact state. and a polyhedron moving means for moving the polyhedron attached to the attached shaft in a direction orthogonal to the rotation center line of the attached shaft, and detecting axis misalignment based on the measurement result of the distance measuring means. The apparatus further includes a control means for controlling the operation of the polyhedron moving means so that the center of the attached shaft and the rotation center of the polyhedron coincide with each other.

(Function) That is, according to the present invention, the distance to each face of the polyhedron attached to the attached shaft can be measured in a non-contact state, and the control means can determine the direction and amount of axis deviation based on the measurement results. The operation of the polyhedron moving means is controlled so that the center of the attached shaft coincides with the rotation center of the polyhedron. As a result, the misalignment of the polyhedron with respect to the shaft to which it is attached can be automatically adjusted without damaging the surface of the polyhedron, making it possible to streamline the adjustment work and reduce the burden on the operator.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows the overall configuration of the axis deviation adjustment device, and FIG. 2 is a block diagram showing the control system.

The axis misalignment adjustment device is roughly divided into a jig mechanism section 1 and a control section 2 as a control means for controlling the jig mechanism section 1.

The jig mechanism section 1 includes each surface 11 of a polygon mirror 11 as a polyhedron attached to a motor shaft 10 as an attached shaft.
A distance measuring means 12 that sequentially measures the distance L (see FIG. 3) from a to llf in a non-contact state, and a polygon mirror 11 attached to the motor shaft 10 are connected to the motor It has mirror moving means 13 as a polyhedron moving means for moving in a direction (X direction) orthogonal to the rotation center line of #10.

Further, the distance measuring means 12 irradiates the light reflecting surface 11a (11b to 11f) as a surface of the polygon mirror 11 with a laser beam and captures the reflected light.
A laser displacement meter 15 as a non-contact measuring device that measures the distance from the polygon mirror 11 to each of the light reflecting surfaces 118 to 1 of the polygon mirror 11 in a non-contact state.
The motor shaft rotating means 17 rotates the motor shaft 10 of the mirror drive motor 16 so that the motor shafts 1f sequentially face each other.

This motor shaft rotation means 17 includes an elevating member 18 that is provided below the installation position of the mirror drive motor 16 and is movable in the vertical direction (Z direction), and a turntable pulse motor 19 mounted on the elevating member 18. The motor shaft 10 can be rotated by rotating the turntable 20 when the turntable 20 is pressed against the lower end surface of the motor shaft 10.

The mirror moving means 13 also includes a plurality of claws 31 that can be engaged with an annular groove 30 formed on the upper surface of the polygon mirror 11.
. . . (three heads in the embodiment), which is movable up and down, and this head 32 is held by an actuator 34 that is movable in the front-rear direction (X direction) by an actuator movement mechanism 33. .

The actuator moving mechanism 33 includes an X stage 35 that holds an actuator 34, a micro head 36 to which a spindle 36a is connected to the X stage 35, and a pulse motor 37 that extends and retracts the spindle 36a of the micro head 36. With this configuration, the actuator 34 held on the X stage 35 can be moved minutely in the X direction.

Further, the control section 2 as a control means for controlling the jig mechanism section 1 includes a calculation section 40, a memory section 41,
It has an interface (1/F) 42, etc., and this control unit 2 controls the turntable pulse motor 19 via the turntable motor driver 45, the actuator pulse motor 46 via the actuator motor driver 46, and the laser. The laser displacement meter 15 is connected via the displacement meter controller 47.

Then, the center S of the motor shaft 10 is determined by detecting the axis deviation based on the measurement result by the distance #i Ml determining means 12.

The operation of the mirror moving means 13 is controlled so that the rotation center S2 of the polygon mirror 11 coincides with the rotation center S2 of the polygon mirror 11.

Next, the axis misalignment adjustment operation will be explained with reference to FIGS. 3 and 4.

First, the mounting structure of the polygon mirror 11 will be explained. As shown in FIG.
The motor shaft 10 is fixed by being clamped by a seat 51 integral with the motor shaft 10 and a stopper 52 made of a spring material and directly attached to the upper end of the motor shaft 10.

At this time, the outer diameter dimension of the motor shaft 10 and the polygon mirror 1
The inner diameter of the rotation center hole 50 of No. 1 is set to such a size that a slight gap G is formed between them. For this reason, simply fitting the rotation center hole 50 into the motor shaft 10 will cause the center S1 of the motor shaft 10 to
1 and the rotation center S2 may not coincide with each other and may be deviated by 6 dimensions.

The present invention makes it possible to automatically adjust this "axis misalignment" state.

That is, the polygon mirror 11 and the mirror drive motor 16
, motor board 55, and other assemblies are held in a predetermined position via a holder (not shown).

Then, as shown in FIG. 4, the laser hole a is irradiated onto the first surface 11a of the polygon mirror 11 via the laser displacement meter 15, and the distance L from the reflected light to the first surface 11a is determined by M.
Determine. This measurement result is stored in the memory section 41 of the control section 2.

Next, a signal is sent to the turntable pulse motor 19 of the motor shaft rotating means 17 to rotate the polygon mirror 11 by a predetermined angle so that the second surface 11b faces the laser displacement meter 15. Then, the distance L to the second surface 11b is measured.

In this way, all distances 111 from 11a to 11f are
After measuring 1L, the calculation unit 40 of the control unit 2 measures one surface, for example, the surface 11d opposite to the distance IIL to lla.
The difference between the distance L and the center S of the motor shaft 10 is calculated.
1 to the surface 11a and the center S of the motor shaft 10
, to the surface 11d are respectively determined. If the distance g and the distance 1lilp2 are equal, it is determined that there is "no deviation" in this given surface direction.

Furthermore, if the distance 111 and the distance ρ2 are not equal, then
It is determined that there is a shift, and the direction and amount of shift are detected and stored in the memory unit 41.

Similarly, the remaining surfaces 11b and lle, llc and 11f
The direction and amount of deviation relative to each other are detected.

In this way, when the direction and amount of axial deviation of the polygon mirror 11 are detected, the control unit 22 corrects the amount of deviation.
A drive signal is sent from the mirror moving means 13 to the mirror moving means 13.

On the other hand, as shown in FIG. The polygon mirror 11 is rotated by a predetermined angle by the motor shaft rotation means 17 so that the movement direction (X direction) of the actuator 34 coincides with the movement direction (X direction) of the actuator 34.

Then, a signal is sent to the actuator motor driver 46, and the actuator pulse motor 37 of the actuator moving mechanism 33 is driven.

Then, the spindle 36a of the micro head 36 expands or contracts, and the X stage 35, which holds the actuator 34 including the head 32, is shifted by a predetermined amount in the direction of displacement, that is, by an amount that is half of the amount of displacement δ (δ/2). move it.

As a result, the polygon mirror 11 moves in a predetermined direction (rightward in the state shown in FIG. 3) by half the dimension δ shown in FIG. 3 against the elastic pressing force of the stopper 52, and the motor shaft 10 and the rotation center S2 of the polygon mirror 11 coincide with each other.

In addition, the present invention uses 6 as a polyhedron in the mud-examples.
Although a polygon mirror with surfaces has been described, the mirror is not limited to this, and any type of mirror may be used as long as it is necessary to adjust the axis misalignment of the polyhedron, regardless of the number of surfaces or the purpose.

It goes without saying that various other modifications can be made without changing the gist.

[Effects of the Invention] Since the present invention is configured as described above, it is possible to automatically adjust the axis misalignment of the polyhedron with respect to the attached axis without damaging the surface of the polyhedron. This has the effect of providing a polyhedral axis misalignment adjustment device that can reduce the burden and the like.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention. Fig. 1 is a configuration explanatory diagram showing the overall configuration of the device, Fig. 2 is a block diagram showing the control system, and Fig. 3 shows the main points of the state for adjusting misalignment. FIG. 4 is a side view showing a partially sectioned section, and FIG. 4 is a plan view as well. 2... Control means (control unit) 10... Mounted shaft (
motor shaft), 11... polyhedron (polygon mirror), 1
1a-llf...plane, 12...distance measuring means, 13
... Polyhedron moving means (mirror moving means) S, ... Rotation center line of attached shaft, S2 ... Rotation center of polyhedron, δ
...Axis misalignment.

Claims (1)

[Scope of Claims] Distance measuring means for measuring the distance from each face of a polyhedron attached to a shaft to be mounted in a non-contact state; a polyhedron moving means for moving the polyhedron in a direction orthogonal to the polyhedron; What is claimed is: 1. A polyhedral axis misalignment adjustment device, comprising: a control means for controlling the operation of a moving means.