JP4897951B2 - Tubular deflection measurement method and apparatus - Google Patents

Description

  The present invention relates to a shake measuring method and a shake measuring apparatus for measuring shake of a photosensitive drum or other tubular body used in an electrophotographic apparatus.

In recent years, due to the demand for higher performance (higher resolution), smaller size, and lower cost for electrophotographic apparatuses such as copiers and printers, high precision and low cost are strongly demanded for the photosensitive drums used therefor. It has been requested.
Therefore, the drum is required to minimize the run-out during rotation, but in order to meet the demand for higher performance and lower cost of the electrophotographic apparatus, the run-out measurement of the drum is not performed on all products. It is required to be performed accurately in a shorter time.

In response to the above request, the following drum shake measuring method and apparatus have been proposed.
The first is to support the drum horizontally at four points by rolling the ball from below at two locations on the inner peripheral surface of each end of the drum, and the ball contacts the outer peripheral surface of the drum. A distance sensor having a measurement point is installed at a position along one of the two buses connecting the two inner peripheral surfaces of each end. Then, the drum is rotated, and the distance from the distance sensor to the measurement point is measured by the distance sensor in at least three places spaced in the circumferential direction of the drum, and the measurement value obtained by this measurement is obtained. By performing arithmetic processing, the eccentric amount and the eccentric direction of the outer peripheral surface of the drum with respect to the virtual central axis connecting the centers of both ends of the drum are calculated (Patent Document 1 described later).

  Secondly, the drum is horizontally supported by being sandwiched between rollers inserted inside at both ends of the drum and rollers or rollers fixed to the outer periphery. And while rotating the drum, using a distance measuring means for measuring the distance between the specific position outside the drum and the drum, measure the distance between the specific position and the measurement point on the side surface of the drum, An eccentric amount and an eccentric direction of the outer peripheral surface of the drum with respect to a virtual central axis connecting the centers of both ends of the drum are calculated (Patent Document 2 described later).

The conventional shake measuring method and apparatus have the following problems.
That is, the accuracy of the ball may be affected by the accuracy of the ball, its installation accuracy (the first), the eccentric amount of the roller (the second), the displacement in the length direction of the drum (the first), etc. There is.
The drum support mechanism including the installation structure of the balls and rollers becomes complicated, and the equipment cost increases for more accurate measurement.
Since the drum is supported at both ends, it takes time to support and remove the drum from the support position until measurement is started, and as a result, a series of measurement operations takes time.
JP 2002-48530 A JP 2002-91233 A

An object of the present invention is to further improve the accuracy of the vibration measurement of the tubular body and further shorten the measurement work, and its purpose is to provide a measurement method capable of measuring the vibration of the rotating tubular body more accurately and quickly. It is to provide.
Another object of the present invention is to provide a shake measuring apparatus having a simpler configuration that can smoothly implement a shake method capable of achieving the object.

  In order to solve the above-mentioned problem, the tubular body run-out measuring method according to the present invention holds one end of the tubular body while pressing the inner surface of the tubular body against a rotatable tube end chuck, and the tube end chuck. Measure the distance from a predetermined measurement position in the other end of the tubular body to the inner periphery of the tubular body while rotating the tubular body by the above, and obtain a measured value for each predetermined rotation angle. Measuring a distance from a measurement position that is a predetermined position between both ends of the tubular body to the outer circumference of the tubular body to obtain an outer circumference of the tubular body to obtain a measurement value for each rotation angle, and performing an arithmetic process on the measurement value. The virtual center axis of the tubular body is obtained from the inner diameter center of the other end portion of the tubular body by calculating the center of the inner diameter and the rotation center of the tube end chuck at a position corresponding to the one end portion of the tubular body. In the measurement position It is the most important feature that it includes means for correcting the measured value by the bias amount of the imaginary central axis relative to the axis of rotation in a plane perpendicular to the rotation axis of the serial tube end chuck.

  In order to solve the above-described problems, a tubular body shake measuring apparatus according to the present invention has a set surface that is rotatable and orthogonal to the rotation axis, and the inner surface of the tubular body on which one end of the set surface is set. A tube head chuck that holds one end of the tubular body in a pressed state, and a measuring head from a predetermined installation position that does not interfere with the tubular body to a part of the inner periphery of the other end of the set tubular body Displacement measuring means capable of moving in a range up to the facing position, and a predetermined position between both ends of the tubular body to measure the distance from the measurement position away from the outer circumference of the tubular body to the outer circumference of the tubular body The most important feature is that it has a distance measuring means installed.

According to the tubular body run-out measuring method of the present invention, the tubular body is held at its one end by the tube end chuck while the inner surface is chucked. The virtual center axis of the tubular body is obtained from the inner diameter center of the other end of the tubular body and the rotation center of the tube end chuck at a position corresponding to the one end of the tubular body. The calculated virtual center axis does not affect the thickness deviation of the tubular body, and therefore, the virtual center axis of the tubular body is closer to the true center axis of the tubular body.
As described above, the measured value of the outer circumference of the tubular body is corrected by the amount of deviation between the rotation axis of the tube end chuck that chucks the inner surface of one end of the tubular body and the virtual central axis of the tubular body. The photosensitive drum and the like are rotated with the flange members inscribed at both ends thereof, but the method of the present invention measures the deflection while chucking and rotating the inner surface of one end of the tubular body. The vibration of the tubular body is measured along the actual usage state of the photosensitive drum or the like.
Since the virtual central axis of the tubular body is obtained from the inner diameter center of the other end portion of the tubular body and the rotation center of the tube end chuck at a position corresponding to the one end portion of the tubular body, in the course of the method of the present invention.
Therefore, the shake can be measured more accurately.
Since the deflection of the tubular body is measured while being rotated while the inner surface of one end is chucked instead of being supported at both ends, the axial alignment of both ends is unnecessary, the time for holding the tubular body on the tube end chuck, and the tubular body By significantly reducing the time for removing from the tube end chuck, the runout can be measured more quickly (in a short time).
In addition, since the tubular body is supported at one end, the support mechanism is simpler (the number of parts is reduced), and the equipment cost is lower.

  According to the tubular body shake measuring apparatus of the present invention, since it is configured as described above, the method of the present invention can be carried out smoothly and the overall configuration is simplified.

  FIG. 1 is a schematic front view of a tubular body shake measuring apparatus according to the present invention, and FIG. 2 is an enlarged plan view showing a positional relationship between the displacement measuring means, the pressing means and the tubular body in the apparatus of the embodiment of FIG. 3 is an enlarged plan view of the tube end chuck in the apparatus of the embodiment of FIG. 1, and FIG. 4 is a portion of the apparatus of the embodiment of FIG. 1 in which the tubular body is set on the tube end chuck and is pressed by the pressing means. FIG. 5 is a partial plan view of the distance measuring means in the apparatus of the embodiment of FIG.

As shown in FIG. 1, a tube end chuck 2 that holds one end (lower end) portion of a tubular body 1 in a state of pressing the inner surface thereof is attached to a central portion of an air spindle 2a installed on a predetermined installation base. It is configured to rotate via the air spindle 2a by a driving means (not shown).
In this embodiment, the tube end chuck 2 is set to be orthogonal to the rotation axis P ′ of the tube end chuck 2 in a state where the guide shaft portion 20 protruding to the center portion does not rotate to the outer periphery of the proximal end of the guide shaft portion 20. These are balloon chucks each having a surface 21 (trade name of Fujii Seimitsu Kogyo Co., Ltd.).
As shown in FIG. 3, the operating portion of the tube end chuck 2 is composed of a plurality (six in this embodiment) of divided pieces 20a to 20f that are divided at equal angular intervals from the center in plan view. When the tube end chuck 2 holds (chuck) one end portion of the tubular body 1, each of the divided pieces 20 a to 20 f as shown in FIG. The end of the guide shaft portion 20 is swelled (expanded) by an equal amount in the circumferential direction.

Reference numeral 3 in FIG. 1 and FIG. 2 is a non-contact type displacement measuring means comprising an eddy current displacement sensor. When the tubular body 1 is set on the set surface 21 of the tube end chuck 2, the required measurement is finished and the set surface is set. Until it is removed, the holding block 30 is held at a predetermined installation position that does not interfere with the tubular body 1, and the holding block 30 is attached to a support arm 31 that extends sideways.
The displacement measuring means 3 is formed on the tubular body 1 in which the sensor head surface of the displacement measuring means 3 is held by the tube end chuck 2 from a state of being installed as shown in FIG. A range up to a position (hereinafter simply referred to as “measurement position”) that coincides with the measurement position in the other end (upper end) is reciprocated, and the measurement position to the inner circumference of the tubular body 1 at the measurement position. Measure distance.

1, 2, and 4, reference numeral 4 does not interfere with the tubular body 1 from when the tubular body 1 is set on the set surface 21 of the tube end chuck 2 until it is removed from the set surface after the required measurement is completed. It is a pressing member installed at a predetermined installation position, descends from this installation position to the position shown in FIG. 4, and the tubular body 1 set on the set surface 21 of the pipe end chuck 2 is moved to the axis of rotation of the pipe end chuck 2. It operates to press against the set surface 21 along P ′.
In this embodiment, the pressing member 4 includes a holding frame 41 having a horseshoe shape or the like in plan view, and three or more downward contacts attached to the lower surface of the holding frame 41 with screws (not shown) at a predetermined angular interval. It consists of a piece 40. Each contact piece 40 is formed in a conical shape or a truncated cone shape as illustrated.
As shown in FIG. 2, the pressing member 4 is connected to both sides of the holding frame 41 along the horseshoe shape through a pair of support arms 42 and 42 attached to be parallel to the support arm 31 of the displacement measuring means 3. Then, it is reciprocated from the installation position of the solid line in FIG. 4 to the position of the two-dot chain line in FIG.
Each contact piece 40 is located at an equal distance from the rotation axis P ′ of the tube end chuck 2, and when the pressing member 4 presses the tubular body 1 against the set surface 21 of the tube end chuck 2 as shown in FIG. A part of the conical surface contacts the inner edge of the other end of the tubular body 1.
The pressing member 4 is not an indispensable component, but when the tube end chuck 2 chucks one end of the tubular body 1 from the inside as described later, the rotation axis P ′ of the tube end chuck 2 and the tubular body 2 This is useful for minimizing the deviation from the virtual center axis connecting the centers of both ends.

  The displacement measuring means 3 and the pressing member 4 and the members supporting them are designed so that they do not interfere with each other when they reciprocate as described above. In the state where the displacement measuring means 3 and the presser member 4 are moved to the installation position. The displacement measuring means 3 and the pressing member 4 and the members supporting them are designed so as not to interfere with the tubular body 1 when the tubular body 1 is set on the tube end chuck 2 and removed from the tube end chuck 2. ing.

Reference numeral 5 denotes a distance measuring means comprising a laser beam projecting section 50 and a laser beam receiving section 51 which are arranged to face each other via a tubular body 1 held at one end to a tube end chuck 2, and the tubular body 1 has a diameter thereof. It is located within the light projection width of the laser light by the light projecting unit 50 (FIG. 5).
The distance measuring means 5 has a tubular shape that is closest to the measurement base position 52 when the tubular body 1 is rotated from the measurement position 52 that is located on one side of the projection width of the laser beam by the light projecting unit 50 of FIG. The distance to the measurement point 10 on the outer periphery of the body 1 is measured.
The distance measuring means 5 is installed so as to measure the distance at one place between both ends of the tubular body 1 held on the tube end chuck 2 (for example, the center portion between both ends, that is, the center portion in the length direction). However, it is preferable to install a plurality of the tubular bodies 1 so as to be located at predetermined intervals along the length direction of the tubular body 1.
In this embodiment, the tubular body 1 is installed at three convenient locations from the one end of the tubular body 1 to the positions of 1/10, 1/2 and 9/10 of the full length.

A method for measuring the deflection of the tubular body 1 using the measurement apparatus of the embodiment will be described below.
The tubular body 1 is a high-precision formed tube made of an aluminum alloy having a diameter = 20 mm, a wall thickness = 1 mm, and a length of 260 mm.
1, the tubular body 1 is held by, for example, a robot (not shown) and moved to a state directly above the tube end chuck 2 while the displacement measuring means 3 and the pressing member 4 are returned to the installation position. One end of the tubular body 1 is set on the set surface 21 of the tube end chuck 2.
Next, the tubular body 1 is pressed against the set surface 21 of the tube end chuck 2 along the rotation axis of the tube end chuck 2. At this time, each contact piece 40 of the holding member 4 is at an equidistant position from the rotation axis P ′ of the tube end chuck 2, and the holding member 4 holds the tubular body 1 and the set surface 21 of the tube end chuck 2 as shown in FIG. 4. In the pressed state, a part of these conical surfaces comes into contact with the inner edge of the other end of the tubular body 1, so that the center of both ends of the tubular body 1 with respect to the rotation axis P ′ of the tube end chuck 2. The amount of deviation of the upper end portion of the virtual central axis that connects them becomes smaller.
After pressing the tubular body 1 as described above, the end of each of the divided pieces 20a to 20f of the tube end chuck 2 is expanded in the circumferential direction by supplying air from an air supply pipe (not shown), and one end of the tubular body 1 While holding the inner surface in a chucked state, the pressing member 4 is returned to the installation position (or after being returned), and the displacement measuring means 3 is measured in the upper end portion of the tubular body 1 as indicated by a two-dot chain line in FIG. Move to position.
It is preferable in terms of measurement accuracy that the measurement position of the displacement measuring means 3 is set as close to the upper end of the tubular body 1 as possible.

In a plane perpendicular to the rotational axis P ′ of the tube end chuck 2 at the position of the displacement measuring means 3 in the above state, the relationship between the tubular body 1, the displacement measuring means 3 and the rotational axis P ′ is shown in a plan view. As shown in FIG. FIG. 6 shows X and Y coordinates on a plane orthogonal to the rotation axis P ′. The X axis is orthogonal to the rotation axis P ′, and the Y axis is orthogonal to the X axis at the position of the rotation axis P ′. .
While the tube end chuck 2 is rotated 360 ° in a predetermined direction in the above-described state, the displacement measuring means 3 continuously measures the distance from the measurement position (the head surface of the displacement measuring means) to the inner periphery of the tubular body 1. The measured value s (θ) for each predetermined rotation angle θ of the tubular body 1 (for example, 1 ° to 10 °, but 1 ° in this embodiment) is recorded. For example, the measured value is stored in the memory of a computer (not shown) (computer used for various calculations and calculations for carrying out the method of the present invention).

When the tubular body 1 rotates counterclockwise as indicated by the arrow in FIG. 6, when viewed from the lower end direction of the tubular body 1 which is the reference direction of rotation, the tubular body 1 rotates clockwise. The rotation angle of the corresponding position measured or measured by the displacement measuring means 3 or the distance measuring means 5 is viewed from the opposite direction of the rotation of the tubular body 1 as viewed from the upper end direction of the tubular body 1, that is, viewed from the lower end direction of the tubular body 1. Since this is a rotation angle, in this specification, for convenience, the rotation angle when the rotation of the tubular body 1 is assumed to stop at each rotation angle when the rotation of the tubular body 1 is viewed from the upper end direction is expressed as “rotation angle”. θ ′ ”, and the rotation angle when the rotation of the tubular body 1 is viewed from the lower end direction is described as“ rotation angle θ ”.
Therefore, the rotation angle θ = 360 ° −the rotation angle θ ′.
In this specification, “rotation angle θ ′” means the X axis (X> 0) when the rotation of the tubular body 1 is stopped as described above, the rotation axis P ′, and the inner diameter of the tubular body 1 at the position. This is an angle formed by the connecting line, and is used to obtain the inner diameter center O at the upper end of the tubular body 1 as will be described later.

The other symbols displayed in FIG. 6 are as described below.
s (θ ′), s (θ): Measurement distance L of the displacement measuring means 3 at a certain rotation angle θ ′, θ: Distance between the rotation axis P ′ and the measuring head surface of the displacement detecting means 3 e: Center of inner diameter of the tubular body Distance between O and rotation axis P ′ α ₀ : Line connecting the inner diameter center O of the tubular body and the rotation axis P ′ when the rotation angle θ, θ ′ = 0 ° of the tubular body and the X axis (X> 0) Angle made with

A virtual center axis O ′ (FIG. 9) of the tubular body 1 is calculated by immediately performing a calculation process on the measurement value s (θ) obtained by the displacement measurement means 3 and the rotation angle data corresponding to the measurement value.
The procedure for calculating the virtual center line O ′ of the tubular body 1 will be described in detail below.
Step 1
As described above, the distance from the measurement position to the inner circumference of the upper end of the tubular body 1 is continuously measured while rotating the tubular body 1, and the measured value for each rotation angle θ of the tubular body 1 is recorded.

Step 2
The measurement distance s (θ ′) and the rotation angle θ ′ of the displacement measuring means 3 are converted into XY coordinate data by the following equations 1 and 2 (the rotation axis is the origin).
X (θ ′) = s (θ ′) · cos (θ ′) …… Equation 1
Y (θ ′) = s (θ ′) · sin (θ ′) …… Equation 2

Step 3
The coordinate data is graphed as shown in FIG. 7 (it becomes a circle), and the inner diameter center O of the upper end portion of the tubular body 1 is obtained by the least center square method. In FIG. 7, 36 points of rotation angles θ ′ = 0 °, 10 °, 20 °... 330 °, 340 °, 350 ° are used.
The inner diameter center O is not a minimum center square method, and the minimum value is subtracted from the maximum value measured by the displacement measuring means 3 at each rotation angle interval (θ) when the tubular body is rotated 360 ° (formula: e = S [θ] max−s [θ] min).

Step 4
From the rotation axis P ′ and the inner diameter center O of the upper end portion of the tubular body 1, a distance e between the inner diameter center O and the rotation axis P ′ and a line connecting the inner diameter center O and the rotation axis P ′ by the following expressions 3 and 4. An angle α ₀ formed with the X axis (X> 0) is obtained. Since the rotation axis is the origin, the coordinates of the rotation axis are (0, 0).
・ In the case of inner diameter center O (x, y) e = √ (x ² + y ² ) …… Equation 3
α ₀₀ = | tan ⁻¹ (y / x) …… Equation 4
However, when x> 0 and y> = 0, α ₀ = α ₀₀
・ When x> 0, y <0, α ₀ = α ₀₀ + 90 °
・ When x <0, y <0, α ₀ = α ₀₀ + 180 °
・ When x> = 0, y <0, α ₀ = α ₀₀ + 270 °
The virtual center line of the tubular body 1 from the angle α ₀ formed by the line connecting the inner diameter center O and the rotation axis P ′ obtained as described above and the X axis and the rotation center P of the set surface 21 of the tube end chuck 2. O ′ (FIG. 9) is calculated.

Note that the distance L between the rotation axis P ′ and the measurement position of the displacement detection means is tubular when the value is relatively large and the distance e between the inner diameter center O and the rotation axis P ′ and the rotation angle θ ′ = 0 °. Since the influence on the calculation error of the angle α ₀ formed by the line connecting the inner diameter center O of the body and the rotation axis P ′ and the X axis is very small, this can be ignored. That is, as shown in FIG. 10A, a circle graphed from the rotation axis P ′ to the distance L between the measurement positions of the displacement detection means and the measurement value s (θ) measured by the displacement measurement means 3 is plotted. ), When reduced in the radial direction by L, it becomes equal to a circle graphed from the measured value s (θ) measured by the displacement measuring means 3 as shown in FIG. This can be explained from the fact that the center O hardly changes.
For example, when L = 10 mm, when this is used for the calculation and when this is ignored, a difference of 0.02 μm is generated with respect to the distance e between the inner diameter center O of the tubular body and the rotation axis P ′, and the rotation angle θ of the tubular body Only a difference of 0.21 ° was produced with respect to the angle α ₀ angle formed by the line connecting the inner diameter center O of the tubular body and the rotation axis P ′ and the X axis when “= 0 °”.

8 is a schematic end view of the tubular body 1 in a plane orthogonal to the rotational axis P ′ at the level of the measurement position of the displacement measuring means 3, and FIG. 9 shows the tubular body 1 in the Y-axis direction of FIG. It is the schematic of the tubular body full length seen along. In addition, the tubular body 1 shown with the dashed-two dotted line of FIG. 8 has shown the state correct | amended by the correction data mentioned later.
While the tubular body 1 is rotated 360 ° as described above, the distance measuring means shown in FIG. 5 is simultaneously measured by the displacement measuring means 3 while continuously measuring the distance from the measurement position to the inner periphery of the tubular body 1. 5, measurement away from the outer periphery of the tubular body 1 at the measurement positions L1, L2, L3 (installation level of the distance measuring means 5 in FIG. 5) at predetermined intervals in the length direction of the tubular body 1 as shown in FIG. The distances a ₁ , a ₂ , a ₃ from the position 52 to the measurement point 10 on the outer periphery of the tubular body 1 are continuously measured.
As is apparent from the description of FIGS. 8 and 9, the measurement position 52 is separated in the outer peripheral direction of the tubular body 1 and is parallel to the rotation axis P ′ of the tube end chuck 2 (indicated by dots in FIG. 8). The measurement point 10 is a position on the outer circumference of the tubular body 1 that is closest to the measurement position at the measurement position 52. However, in the case of FIG. 9, the measurement position 52 may not be located on the same vertical plane in each of the levels L1 to L3.
The measurement levels (three locations at predetermined intervals in the length direction of the tubular body 1) L1 to L3 with respect to the tubular body 1 at the distances a ₁ , a ₂ and a ₃ shown in FIG. 9 are as described above in this embodiment. The length of the tubular body 1 is set at h = L1 = 9 / 10h, L2 = 1 / 2h, L3 = 1 / 10h in order from the upper end of the tubular body 1.

The measurement distances a ₁ , a ₂ , and a _{3 at the} measurement levels L1 to L3 measured as described above are measured when the distance from the measurement position to the inner periphery of the upper end portion of the tubular body 1 is measured by the displacement measuring means 3. Since the measurement value s (θ) for each predetermined rotation angle θ (1 ° in this embodiment) of the tubular body 1 is recorded, the corresponding measurement distance a is obtained using the angle data of each rotation angle θ. Immediate processing is performed to select the measured values of ₁ , a ₂ , and a ₃ .
By calculating the distance measurement value, the angle data, and the related data, a deviation amount (correction amount) with respect to the rotation axis P ′ of the virtual center line O ′ of the tubular body 1 is calculated, and the virtual center is calculated based on the deviation amount. The line O ′ is corrected so as to coincide with the rotation axis P ′, and the deflection of the tubular body 1 at each measurement position is calculated.

Hereinafter, the procedure from the measurement of the distances a ₁ , a ₂ , a ₃ to the deflection measurement of the tubular body 1 will be specifically described.
Step 5
For each rotation angle θ, the distances a ₁ , a ₂ , a ₃ measured as described above, the distance e between the inner diameter center O and the tube end chuck rotation axis P ′ at the upper end of the tubular body 1, and the inner diameter center From the angle α (θ) formed by the line connecting O and the rotational axis P ′ and the X axis (X> 0), the shake correction data a ₁ ′ (at the measurement positions L1, L2, and L3) according to the following equations 5-7: θ), a ₂ ′ (θ), a ₃ ′ (θ) are obtained.
a ₁ ′ (θ) = a ₁ (θ) + e · cos α (θ) · 9/10 (Formula 5)
a ₂ ′ (θ) = a ₂ (θ) + e · cos α (θ) · 1/2 Equation 6
a ₃ ′ (θ) = a ₃ (θ) + e · cos α (θ) · 1/10.
Where α (θ): α ₀ + θ
θ: rotation angle of the tubular body (0 to 360 °)
As is clear from the above equations, the deviation amount e · cos α (θ), which is the correction amount actually calculated, is the rotation axis P ′ and the parallel line to the rotation axis P ′ at the upper end portion of the tubular body 1 in FIGS. 53, the amount of change in the distance between the rotation axis P ′ projected on the plane passing through 53 and the inner diameter center O of the tubular body. In plan view, the amount of eccentricity of the virtual center axis P ′ with respect to the rotation axis O ′, that is, the rotation axis O The distance e between 'and the inner diameter center O.

Step 6
The shakes at the measurement levels L1, L2, and L3 when the tubular body is rotated 360 ° are calculated by the following equations 8 to 10.
L1 position fluctuation = a ₁ ′ (θ) max−a ₁ ′ (θ) min.
L2 position fluctuation = a ₂ ′ (θ) max−a ₂ ′ (θ) min.
L3 position fluctuation = a ₃ ′ (θ) max−a ₃ ′ (θ) min.

According to the tubular body run-out measuring method of the embodiment, the tubular body 1 is held at its one end by the tube end chuck 2 with its inner surface chucked, so that the inner diameter center of the one end of the tubular body 1 is Since the center of rotation of the tube end chuck 2 is likely to coincide with each other, and the virtual center line O ′ of the tubular body 1 is obtained by performing arithmetic processing on the measured value on the inner surface of the other end of the tubular body 1, the virtual center line O ′ is more likely to coincide with the true center line of the tubular body 1.
As described above, the measured value of the outer periphery of the tubular body 1 is obtained by deviating the rotation axis P ′ of the tube end chuck 2 that chucks the inner surface of one end of the tubular body 1 and the virtual central axis P ′ of the tubular body 1. Correct by amount. The photosensitive drum or the like is rotated in a state where the flange members are inscribed in both end portions thereof. However, the measurement method measures vibration while chucking and rotating the inner surface of one end portion of the tubular body 1. Then, the shake of the tubular body is measured along the actual usage state of the photosensitive drum or the like.
Since the virtual central axis of the tubular body 1 is obtained from the inner diameter center O of the other end portion of the tubular body 1 and the rotation center of the tube end chuck 2 at a position corresponding to the one end portion of the tubular body 1, the tubular body 1 A thickness deviation of 1 is also measured.
Therefore, the shake can be measured more accurately.

Since the deflection of the tubular body 1 is measured in a state where the tubular body 1 is supported at one end, not at both ends, axial alignment at both ends is unnecessary, the time for holding the tubular body 1 on the tube end chuck 2, and the tubular body 1 at the tube end holder. Measurement time can be made even faster (in a short time) by greatly reducing the time taken to remove from 2.
In addition, since the tubular body 1 is supported at one end, the support mechanism is simpler (the number of parts is small), and the equipment cost is further reduced.

According to the shake measurement method and measurement apparatus of the embodiment, the measurement of the distance on the inner periphery of the tubular body 1 and the measurement of the distance on the outer surface are both performed by non-contact measurement means or measurement means. There is little risk of damaging the inner and outer surfaces of the tubular body 1 during the measurement.
Since the tubular body 1 is held on the tube end chuck 2 in a posture along the vertical direction, it is easier to install and operate measuring instruments.

After the tubular body 1 is set on the set surface 21 of the tube end chuck 2 and is held by the holder, the tubular body 1 is pressed against the set surface 21 along the rotation axis of the tube end holder 2 by the pressing member 4. When the tube end holder 2 is held, the deviation between the rotation axis and the center line of the tubular body 1 is reduced.
There are three or more pressing members 4 in which a part of the conical surface comes into contact with the inner peripheral edge of the end of the tubular body 1 opposite to the set surface 21 when the tubular body 1 is pressed against the set surface 21 of the tube end holder 2. Since the central portion between all the cones 40 is substantially along the axis of rotation of the tube end holder 2, the tubular body 1 is tubular when pressed against the set surface 21. The deviation between the center line of the body and the rotation axis is further reduced.

Other Embodiments Although the tube end chuck 2 can be implemented even if it is configured to hold the tubular body 1 in an inclined posture or a horizontal posture instead of a vertical posture, it is a so-called vertical type that holds the tubular body 1 in a vertical posture. Is more preferable.
As the displacement measuring means 3, a displacement sensor using laser light or other non-contact type displacement measuring means can be used, or a contact type displacement measuring means can also be used.
The measurement position for measuring the measurement point on the outer periphery of the tubular body 1 can be implemented even if it is provided at one place in the length direction of the tubular body 1.
Moreover, when providing in multiple places along the length direction of the tubular body 1 like the said embodiment, it replaces with installing the distance measurement means 5 in the position corresponding to each measurement position, respectively, and it is a set. Even if a laser projector and a laser receiver are installed, and the projector and the receiver are configured to reciprocate in synchronism with each other in the length direction of the tubular body including the respective measurement positions. can do.
In this case, it is necessary to rotate the tubular body 360 ° every time the light projecting unit and the light receiving unit move to one installation position.
The distance measuring means 5 can be an eddy current displacement sensor, a laser displacement sensor, or the like, or a contact displacement meter.

When there are three or more contact pieces 40 of the pressing member 4, they are in the inverted cone shape or the inverted truncated cone shape as described above, as well as the state where the tubular body 1 is pressed as shown in FIG. 11, for example. 9, if the virtual outer surface when the outer surface that contacts the inner edge of the end portion of the tubular body 1 is made to have a conical shape as a whole, the virtual central axis O ′ of the tubular body 1 in FIG. And the rotation axis P ′ of the tube end chuck can be more easily matched.
Therefore, a single contact piece 40 having a truncated cone shape or a cone shape as shown in FIG.

  The measuring apparatus configured as described above can also be used for measuring the shape of a tubular body, measuring the outer diameter, measuring the roundness, and the like.

1 is a schematic front view of a tubular body shake measuring apparatus according to an embodiment of the present invention. It is a schematic plan view which shows the positional relationship of the displacement measurement means of the measuring apparatus of the said embodiment, and a pressing member. It is an enlarged plan view of the tube end chuck in the measuring apparatus of the embodiment. It is a partially omitted enlarged vertical sectional view of the measuring apparatus of the embodiment. It is a partially omitted enlarged plan view showing the positional relationship between the distance measuring means and the tubular body in the measuring apparatus of the embodiment. It is a figure for demonstrating the arithmetic processing procedure which converts the data measured by the displacement measurement means into XY coordinates, Comprising: It is a schematic end elevation of the tubular body cut | disconnected in the horizontal direction at the position of the said displacement measurement means. It is explanatory drawing of the state which converted the data measured by the displacement measurement means into XY coordinate data, and graphed the data after the said conversion on XY coordinates. It is a figure for demonstrating the point which calculates the correction data which correct | amends the data measured by the distance measurement means, Comprising: It is a schematic end elevation of the tubular body cut | disconnected in the horizontal direction in the position of the displacement measurement means. It is a schematic side view of the tubular body for demonstrating the arithmetic processing procedure which correct | amends the data measured by the distance measurement means with correction data. FIG. 6 is a principle explanatory diagram for explaining the influence of the distance L from the rotation axis P ′ of the tube end chuck to the measurement position of the displacement detection means on the inner diameter center O of the tubular body. FIG. An explanatory view showing the relationship between a circle whose radius is the distance L to the measurement position of the means and a circle obtained by adding the measurement value s (θ) by the displacement detection means to the distance L, FIG. An explanatory diagram in which a circle graphed from the measured value s (θ) is reduced in the radial direction by the distance L, FIG. 5C is an explanatory diagram showing a circle graphed from the measured value s (θ) by the displacement measuring means. It is. It is a fragmentary sectional view which shows the deformation | transformation form of the contact piece in a pressing member. It is a fragmentary sectional view which shows the other deformation | transformation form of the contact piece in a pressing member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tubular body 10 Measuring point of tubular body outer periphery 2 Tube end chuck 2a Air spindle 20 Guide shaft part 21 Set surface 3 Displacement measuring means 4 Pressing member 40 Contact piece 41 Holding frame 5 Distance measuring means 50 Laser projecting part 51 Laser receiving part 52 Measurement position 53 Parallel line 54 Reference plane P Rotation center P ′ of tube end chuck Rotation axis O of tube end chuck O Diameter center O ′ Virtual center axes L1, L2, L3 Positions at predetermined intervals along the length direction of the tubular body a ₁ , a ₂ , a ₃ distance

Claims (17)

Holding one end of the tubular body in a state of pressing the inner surface of the tubular body to a rotatable tube end chuck;
While measuring the distance from a predetermined measurement position in the other end of the tubular body to the inner periphery of the tubular body while rotating the tubular body by the tube end chuck, a measurement value for each predetermined rotation angle is obtained. Measuring the distance from the measurement position at a predetermined position between both ends of the tubular body to the outer circumference of the tubular body from the measurement position away from the outer circumferential direction of the tubular body,
An inner diameter center of the other end portion of the tubular body is calculated by performing an arithmetic process on the measured value, and the tubular body is calculated from the inner diameter center and the rotation center of the tube end chuck at a position corresponding to the one end portion of the tubular body. Find the virtual center axis of the body,
Means for correcting the measurement value based on a deviation amount of the virtual central axis with respect to the rotation axis in a plane orthogonal to the rotation axis of the tube end chuck at the measurement position;
A method for measuring the deflection of a tubular body. The measurement position is located on a reference plane passing through a parallel line with the rotation axis, and the deviation amount is a change amount projected on a plane passing through the rotation axis and the parallel line. 2. A method for measuring runout of a tubular body according to 1. The tubular according to claim 1 or 2, further comprising means for subtracting a minimum value of the corrected data from a maximum value of corrected data obtained by correcting the measured value for each rotation angle by the deviation amount. Body shake measurement method. The method of measuring a vibration of a tubular body according to any one of claims 1 to 3, wherein a plurality of the measurement positions are set in a state of being positioned at predetermined intervals between both ends of the tubular body. The tube end chuck is attached to an air spindle, and the chuck is constituted by a plurality of divided pieces that are divided at equal angular intervals from the center in a plan view and are enlarged by equal amounts toward the inner circumferential direction of the tubular body during operation. The method for measuring a deflection of a tubular body according to any one of claims 1 to 4, wherein: The tubular body according to any one of claims 1 to 5, wherein the tubular body is pressed against the tube end chuck along the rotation axis of the tube end chuck before the tubular body is held by the tube end chuck. Body shake measurement method. The method of measuring a deflection of a tubular body according to any one of claims 1 to 6, wherein the tubular body is in a posture along a vertical direction when held by the tube end chuck. The method of measuring a deflection of a tubular body according to any one of claims 1 to 7, wherein a distance from the measurement position to the inner periphery of the tubular body is measured by a non-contact type displacement measuring means. The method of measuring a deflection of a tubular body according to any one of claims 1 to 8, wherein a distance from the measurement position to a measurement point on the outer periphery of the tubular body is measured by a non-contact type distance measuring unit. . A tube end chuck that has a set surface that is rotatable and orthogonal to the axis of rotation, and that holds one end of the tubular body in a state of pressing the inner surface of the tubular body on which the one end is set to the set surface;
A displacement measuring means capable of moving in a range from a predetermined installation position not interfering with the tubular body to a position where the measuring head faces a part of the inner periphery of the other end of the set tubular body;
A distance measuring means installed to measure a distance from a measurement position at a predetermined position between both ends of the tubular body and away from the outer circumference of the tubular body to the outer circumference of the tubular body;
An apparatus for measuring vibration of a tubular body, comprising: The tubular body run-out measuring apparatus according to claim 10, wherein a plurality of the distance measuring means are installed at predetermined intervals along both ends of the tubular body held by the tube end chuck. The tube end chuck is attached to an air spindle, and the operating portion is configured by a plurality of divided pieces that are divided at equal angular intervals from the center in a plan view and are enlarged by an equal amount toward the inner circumferential direction of the tubular body during operation. The apparatus for measuring runout of a tubular body according to claim 10 or 11, wherein the apparatus is a chuck. A pressing member that operates to press the tubular body against the set surface along the rotation axis of the tube end chuck before the tubular body is set on the set surface of the tube end chuck and held by the tube end chuck. The apparatus for measuring runout of a tubular body according to any one of claims 10 to 12, wherein The pressing member has a single contact piece having a conical shape or a truncated cone shape that comes into contact with the inner peripheral edge of the other end portion of the tubular body when the tubular body is pressed against the set surface, or When the tubular body is pressed against the set surface, three or more virtual outer peripheral surfaces when the outer surface contacting the inner peripheral edge of the other end portion of the tubular body is made continuous form a conical surface as a whole. It has a contact piece, The shake measuring apparatus of the tubular body of Claim 13 characterized by the above-mentioned. The tubular body runout measurement apparatus according to any one of claims 10 to 14, wherein a set surface of the tube end chuck is horizontal. The tubular body shake measuring apparatus according to any one of claims 10 to 15, wherein the displacement measuring means is a non-contact type displacement sensor. The tubular body shake measuring device according to any one of claims 10 to 16, wherein the distance measuring means is a non-contact distance measuring means.

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