JPS6338109A - Milling surface direction measuring instrument - Google Patents

Abstract

PURPOSE:To enable automatic measuring operation by utilizing a microcomputer and to take a measurement in a short time by rotating a body to be measured and measuring its angle position. CONSTITUTION:This instrument consists of an encoder 1 which measures the angle, a motor 2 which rotates a magnet roll 3, a magnet roll 3 as the body to be measured, a Hall element 4 which measures magnetic force, a distance sensor 5, a slide jig 6 for distance value conversion, a milling surface 7 for the body to be measured, and a shaft 8. Then while the magnetic roll 3 is rotated and the angle position is measured, the position of the milling surface 7 and the distance from one external point to the shaft 8 are measured as well as a magnetic force value and outputted to a one-round X-Y recorder, thereby obtaining the result as shown in graphs. The angle thetaf where the distance is maximum is read in the graphs and the angle thetag where the magnetic force is maximum is read, so that the angle theta of magnetization is found as the difference between thetaf and thetag.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device for measuring the magnetized position of a magnet or troll having a plurality of fd points on its surface.

(Prior Art) Magnet rolls having a plurality of magnetic poles on the surface are widely used as means for conveying magnetic developer in electrophotographic apparatuses. This magnet roll is made by, for example, fixing a cylindrical magnet to a shaft and subjecting it to a predetermined magnetization, and is used as it is or by covering it with a cylindrical non-magnetic sleeve.

A conventional device for measuring the magnetized position of a magnet roll uses a two-insertion jig 11 having a similar shape to a shaft 8 having a milling cut 7, as shown in FIG.

Insert the shaft 8 into the jig 1 from the side with the milling surface.
1, the needle 9 is attracted by magnetic force and points in the direction of the magnetic pole, so this direction is read on the scale 10 on the jig and used as the magnetization angle.

(Problems to be Solved by the Invention) However, the conventional measuring device described above has the following problems.

(1) FIG. 7 is a front view of the shaft 8 inserted into the insertion jig 11. A shaft with radius r0 holding string AB and a jig with radius r waiting for string A'B' are A.
If we find the angle between two strings when they touch at a point, we get string A'
Since the perpendicular bisector of B' passes through the center 0, zB'AB=ZM' OM=θ. -θ8.

Here, as the shaft and milling depth, e.g.
r o = 2. 5 1st Seal, I M
Ol=1. 7mm, 1M'
Substituting ol=1.8 tm gives the following.

θ. = CO3-' (1,7/2.5) =47.1
5゜θ, = CO3-' (1,8/2.5) =43
．． 94°;, ZB'AB=θ. From the results of -θ = 3.21° or more, a shaft with a diameter of 5 mm and a milling depth of 0.8 fi can be rotated by ±3.2 degrees even if the center is fixed in a jig with a tolerance of 0.1 m. I understand that.

The permissible tolerance of the magnetized position of the mag roll to be measured is ±3 degrees to -a, so a mechanism to make the flat part parallel (set screw 1
Without 2), measurement using this method is meaningless.

(2) Since the jig is similar to the shaft, it is necessary to create a jig for each item and change the setup.

(3) Automation and quantification are difficult because the measurement method does not convert the results into electrical output.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a milling face orientation measuring device that eliminates the above-mentioned problems.

(Means for Solving the Problems) The measuring device of the present invention is a device that measures the angular position of another measurable physical quantity with reference to the direction of a flat canted surface of a part of a cylindrical shaft. a means for rotating the object to be measured; a means for measuring the angular position; a means for measuring a physical quantity for measuring the angular position; and a means for measuring the distance from a point on the outside of the shaft to the surface of the shaft. , comprising means for converting the distance to the shaft surface into a function of the angle from the reference position, and means for storing the measured value.

(Example) The details of the present invention will be explained below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the present invention.

The magnet roll 3 is chucked on the encoder side, is pushed at the center from the direction of A, and has a mechanism to rotate while holding a constant center.

The device consists of an encoder 1 that measures angles, a motor 2 that rotates a magnetic roll 3, a magnet roll 3 that is an object to be measured, a Hall element 4 that measures magnetic force, a distance sensor 5, and a slide jig for distance value conversion. 6, a milled surface 7 of the object to be measured, and a shaft 8.

According to this device, measurements are performed as follows. While rotating the magnet roll 3 and measuring the angular position, the distance from a point on the outside of the milling surface to the shaft surface is measured, and at the same time the magnetic force value is measured and outputted to the X-Y recorder for one revolution, as shown in Figure 2. It will look like this.

From this figure, by reading the angle θ, which is the maximum value of the distance, and reading the angle θ9, which is the maximum value of the magnetic force, the magnetization angle e can be determined as the difference between θ and θ9.

The above data processing can be automatically outputted by a personal computer as shown in Table 1 through operation control by a sequencer and measurement and processing by a microcomputer as shown in FIG.

In Table 1, the row labeled angle is the above magnetization angle. Note that 921d means 92.1 degrees.

Table 1 Reading Run 0K (angle) d=degX1/10po1
909G 920G 899G 876Gpeak
910G 921G 899G B76Gmaxfl
t OG 935G OG OG minflt
OG 898G OG 0Grflat
OG 37G OG 0G differ
OG 13G OG OGwidth Od
Od Od Odangle 921d
1004d 1918d 2718dinterv
1o04d 914d 799d 882dhalf
Od Od Od
OdReading Run NG *is NG mark pol 926G 930G
8970 882Gpeak
926G 930G 900G
882Gmaxflt OG 9
36G OG OG minflt
OG 890G OG
0Grflat OG 4
6G OG 0G different
OG 16G OG
OG width Od O
d Od Odangle
932 pieces 1004d 1926
cl 2725dinterv 10
04d 921d 799d 87
4dhalf Od Od
Od OdReading Ru
n 0K (angle) d=degX1/10po1
909G 941G 92
0G 876Gpeak 909
G 941G 920G 877G
max t OG 973G
OG 0cm1nflt
OG 896G OG 0G
rflat OG 77G
OG 0Gdiffer OG
19G OG OGwidth
Od Od Od O
dangle 910d 1000d
1915d 2710dinterv 10
00cl 914d 795d 889d
half Od Od Od
According to the present invention, the magnetization angle can be measured even without the slide jig 6 shown in FIG. 1.

However, when directly measured as shown in Figure 4 (a), under ideal conditions, the distance value R□ becomes a graph with respect to θ as shown in Figure 5 (a), and the function is Ra 6 = T - r ocos CX / CO5θ
(0≦θ≦α).

As shown in Fig. 4), the slide jig 6 has a plane wider than the milling surface and moves parallel to the rotation of the shaft.
If there is, the distance value Rb to the jig will be a graph as shown in Fig. 5(b), and its function will be Rb, = T −r oco
s(α−θ) (0≦θ≦α).

Now, in the two functions R,,,R,, when the diameter of the shaft 8 is 5n and the milling depth is 0.81m, the amount of change ΔR0°ΔRb when the angle changes from 0 degrees to 0.3 degrees is ΔR ,, = 0.000023 Otori 1 Δ Rb,y = 0.0097 It becomes a translayer, and the amount of change near 0 degrees that is desired to be measured becomes large, and a change of 0.3 degrees can be sufficiently measured with a normal sensor.

A normal sensor is 0. As long as it has a measurement accuracy higher than OQ1 Dragon and outputs as an electrical signal, an optical type, spiral current type, or dial gauge may be used, especially if the tip has a sufficient measurement accuracy (
A flat dial gauge will have the same effect even without a slide jig.

(effect) According to the present invention, the following effects can be obtained.

! 11 Measurement accuracy of 0.3 degrees is possible with a distance sensor with an accuracy of 1 μ.

(2) Since both the measured value of magnetic force and the measured value of angle are now voltage output, automatic measurement using a microcomputer is possible, making it possible to perform automatic measurement using a microcomputer.
It used to take about 30 minutes to measure 4 pieces, but now it takes 14 seconds for each piece.

(3) The measurement reproducibility tolerance of the microcomputer automatic measuring device can be kept within 0.36 degrees (resolution of the encoder used).

(4) If the slide jig 6 is set at a position where there is a milling surface and can be moved up and down freely, the shaft diameter and milling depth are arbitrary within the measurable range of the distance sensor, so it can be moved to a position where there is a milling surface. With this structure, there is no need for setup changes.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the measuring device of the present invention, Fig. 2 is an output data protograph, Fig. 3 is a diagram showing the functions of the device, and Fig. 4 (a) is a diagram for explaining the direct measurement method. , Figure 4 (b
) is a diagram for explaining the jig measurement method, Figure 5 (a) is a diagram showing the direct measurement function, Figure 5 (bl is a diagram showing the jig measurement function, and Figure 6 is a diagram showing the conventional device , Fig. 7 is a diagram for explaining the maximum error of the conventional method. 1: Encoder, 3: Macnenotrol, 4: Hall element, 5: Distance sensor, 6: Slide jig 7: Milling surface, 8: Shaft , 9: Needle, 10: Scale, 11: Non-magnetic jig, 12: Set screw. Figure 3 Figure 4 (Q) (b) Figure 5

Claims (1)

[Scope of Claims] 2. Scope of Claims (1) In an apparatus for measuring the angular position of another measurable physical quantity with reference to the direction of a plane cut flatly from a part of a cylindrical shaft, A means for rotating an object, a means for measuring an angular position, a means for measuring a physical quantity for measuring an angular position, a means for measuring the distance from a point on the outside to the surface of a shaft, and a means for measuring the position of a flat part of a shaft. 1. A milling face direction measuring device, characterized in that it comprises means for storing values. (2) A milling face direction measuring device according to claim 1, further comprising means for converting the distance to the shaft surface into a function of an angle from a reference position.