JP3701477B2 - Cylindrical surface inspection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a surface inspection apparatus for a cylindrical test object, and more particularly to an apparatus for detecting a convex defect on the surface of a photosensitive drum constituting an electrophotographic image forming apparatus.
[0002]
[Prior art]
A structure of a conventional electrophotographic copying machine and a copying process using the same will be described with reference to FIG. The basic structure of this copying machine is well known, 201 is a photosensitive drum, 202 is an exposure device, 203 is a toner box, 204 is a toner supply roller, 205 is a developing roller, 206 is a developer stirring roller, and 207 is a toner. Sensor 208, fixed guide 209, developer 209, corona charger 210, static eliminator 211, cleaner 212, transfer device 213, separator 214, fixing device 215. Further, reference numeral 216 denotes toner, 217 denotes a carrier, and 218 denotes recording paper.
[0003]
In the copying machine, first, the surface (outer peripheral surface) of the photosensitive drum 201 is uniformly charged by the corona charger 210 in a dark place.
Next, light is applied to a portion other than the image portion by the exposure device 202 to remove the charged charge that has been exposed to the light, thereby forming an electrostatic latent image with the charge remaining in the image portion. In the developing unit, a toner that is colored fine particles charged with a polarity opposite to that of the electrostatic latent image is attached to the latent image to form a visible image.
Subsequently, the recording paper 218 is attached to the toner image, and the corona charger 210 applies a charge opposite to the toner charging polarity to the recording paper 218 from the back side of the recording paper 218, and the toner image is transferred to the recording paper by electrostatic force. Transfer to 218. Heat or pressure is applied to the transferred toner image and fused to the recording paper 218 to form a permanent image.
On the other hand, the residual toner remaining on the photosensitive drum 201 without being transferred is removed by the cleaner 212. The latent image charge on the photosensitive drum 201 is removed by light. Printing is continuously performed by repeating a series of processes from charging to discharging.
[0004]
Incidentally, in order for the toner to adhere correctly to the photosensitive drum 201, it is necessary to keep the gap between the developing roller 205 and the photosensitive drum 201 constant.
Therefore, for example, as shown in FIG. 8, a mechanism is used in which the fixing guide 208 is provided on the developing roller 205 and the photosensitive drum 201 is rotated against the guide 208 with both ends abutting against each other. At this time, it is sufficient that about 10 mm at both ends of the photosensitive drum 201 is a guide portion that contacts the fixed guide 208.
[0005]
Therefore, as shown in FIGS. 9 (a) and 9 (b), the photosensitive drum 201 used in such a copying machine has a metal surface 201a of about 10 mm of both end surfaces. The surface is not coated with a photoreceptor. If there is a convex defect (protruding defect) in this portion, the gap amount changes and good transfer cannot be performed, so such a photosensitive drum should not be used.
[0006]
Further, as shown in FIG. 9B, since the range of 17.5 mm in length including the metal surfaces 201a at both ends is actually a non-image area, the density defect (color unevenness, white spots, white spots) is functionally present. There may be dots, black spots, etc.). Actually, even in the case of a non-defective product, there is a color unevenness in a portion about several mm from the boundary between the metal surface 201a and the photoreceptor coating surface 201b as shown in FIG.
However, as described above, there should be no convex defect that may damage the tip of the cleaner 212 that removes residual toner. That is, it is necessary to detect the presence / absence of a convex defect in the non-image areas at both ends of the photosensitive drum and determine whether the convex defect is good or bad. In the process, the convex defect is most likely to occur at the boundary between the metal surface 201a and the photoreceptor coating surface 201b.
[0007]
As a defect inspection apparatus for a cylindrical member such as a photosensitive drum, Japanese Patent Laid-Open No. Hei 2-2014142 (Title of Invention: Abnormality Detection Method for Surface of Photosensitive Layer) and Japanese Patent Laid-Open No. Hei 4-169840 (Title of Invention: Circumference) (Surface inspection method and apparatus).
In the apparatus disclosed in Japanese Patent Laid-Open No. 2-201442, the laser beam from the light source 311 is sequentially scanned in the longitudinal direction of the photosensitive drum 330 via the rotary polygon mirror 313 as shown in FIG. The scanning light is reflected at a predetermined angle with respect to the longitudinal direction on the surface of the photosensitive layer of the photosensitive drum 330, enters the light receiver 320, and the light intensity is detected by the photomultiplier tube 322, which is input to a predetermined arithmetic processing unit. Is done.
By sequentially repeating such an operation, the laser beam is scanned over the entire surface of the photosensitive drum 330, and the surface abnormality is detected.
In FIG. 10, 318 and 319 are reflecting mirrors, 315 is a stepping motor, and 316 is a stage.
[0008]
In the apparatus described in Japanese Patent Laid-Open No. 4-169840, slit light 402 is projected from a projector 401 provided with a halogen light source or the like toward a photosensitive drum 403 as shown in FIG. Scattered light scattered by the surface defect of the photosensitive drum 403 is collected by the lens 404 and received by the line sensor 405. Reference numeral 405 a denotes a pixel column of the line sensor 405, and reference numeral 406 denotes a light receiving range of the line sensor 405.
[0009]
As described above, in any of the apparatuses described in the above publications, since the surface defect is detected by the change in the amount of received light, the size (area) of the defect can be calculated, but information on the height of the defect can be obtained. There is a problem that you can not get. In addition, these apparatuses are premised on that the normal part without defects is uniform.
Therefore, the detection itself is not possible or is not possible for a specimen having a different surface shape such as both ends of the photosensitive drum in FIG. There is also a problem that even if it can be done, it cannot be distinguished from good products.
[0010]
Further, in an apparatus (not shown) disclosed in Japanese Patent Application Laid-Open No. 56-55805 (title of invention: method for measuring unevenness of measured object), a displacement meter is directly brought into contact with a cylindrical test object, and its true It is configured to measure the circularity and the amount of unevenness, and the measurement area is limited by the width of the displacement meter. However, when this apparatus is applied to the inspection of the convex defect at the end of the photosensitive drum, the displacement meter must be measured while moving in the longitudinal direction of the photosensitive drum, and the inspection time is very long. turn into.
Therefore, it is conceivable to use a displacement meter that can measure a certain width, such as an eddy current type and a capacitance type, but in this case as well, for a measurement object having a diameter of about several tens of μm such as a convex defect. The correct amount of displacement cannot be measured. This apparatus is merely for measuring the roundness and rotational shake of a cylindrical specimen, and cannot be said to be suitable for detecting a defect.
[0011]
Therefore, the present inventor has examined an apparatus shown in FIGS. 12A and 12B as an apparatus capable of reliably detecting a convex defect of a cylindrical specimen, particularly a convex defect on both end surfaces of the photosensitive drum. It is in. In this convex defect detection device 500, a fixed plate 502 is fixed to one end of a bottom plate 501, a linear guide (slide guide) 503 is fixed on the bottom plate 501, and a displacement measuring plate 504 can be moved back and forth on the guide 503. The contact roller 505 is provided on one side of the displacement measuring plate 504 so as to be freely rotatable. Reference numeral 504 a denotes a slider fixed to the lower end portion of the displacement measuring plate 504.
[0012]
Further, one end of the compression spring 506 is fixed to the fixed plate 502, and the other end is fixed to the displacement measuring plate 504.
A distance displacement meter 507 is fixed to the fixed plate 502. The distance displacement meter 507 is for measuring the distance between the displacement measurement plate 504 and the fixed plate 502.
On the other hand, both ends of the photosensitive drum 510 are fixed by chucks 511 and 512 as shown in FIG. 13, and a rotary motor 514 is connected to the chuck 511 through a coupling 513.
[0013]
When detecting the convex defect, the surface of the contact roller 505 and the end surface of the photosensitive drum 510 are brought into contact with each other with an appropriate pressure, and the compression spring 506 is maintained in a contracted state to some extent. Here, when the photosensitive drum 510 is rotated by the rotation motor 514, the contact roller 505 is rotated. In this state, the photosensitive drum 510 is rotated once, and the distance between the fixed plate 502 and the displacement measuring plate 504 is measured by the distance displacement meter 507.
[0014]
In this case, if there is a convex defect on the surface of the photosensitive drum 510, the contact roller 505 is pushed leftward by a minute distance in FIGS. 12A and 12B due to the convex defect. The distance between 502 and the displacement measuring plate 504 is reduced. If the convex defect disappears, the displacement measuring plate 504 returns to the original position by the elastic force of the compression spring 506, and the minute displacement amount of the displacement measuring plate 504 is measured by the distance displacement meter 507 and recorded.
[0015]
FIG. 14 is a graph showing an example of the detection result obtained by the convex defect detection apparatus 500. “Near” on the vertical axis (displacement) indicates that there is a convex defect, so that the displacement measuring plate 504 has a convex defect relative to the fixed plate 502. It shows that it is in a closer position as compared to the normal case without any.
Further, it is possible to detect a convex defect by setting an appropriate threshold value for the amount of “displacement” in FIG. 14, and the “valley” portion in the graph indicates a convex defect signal. In other words, as the photosensitive drum, it is desirable that the graph of FIG. 14 is a straight line parallel to the horizontal axis.
[0016]
[Problems to be solved by the invention]
By the way, in the photosensitive drum production line, the length / diameter and the inspection width ("width") of the edge convex defect correspond to various specifications of an electrophotographic image forming apparatus (for example, a copying machine). In many cases, photoconductor drums having different dimensions (meaning the axial dimension of the photoconductor drum) are produced in units of several days.
However, the convex defect detection apparatus shown in FIG. 12 cannot cope with such a variety of photosensitive drums.
[0017]
The present invention has been made in view of the problems of the various inspection apparatuses shown in FIGS. 10 to 12. The object of the present invention is to provide irregularities on the surface of the cylindrical object, particularly convex defects on the surface of the photosensitive drum, or cylindrical inspection. To provide a surface inspection apparatus for a cylindrical object that can detect the roundness of an object with a simple configuration and a simple operation, and can particularly cope with a plurality of types of photosensitive drums. is there.
[0018]
[Means for Solving the Problems]
[0019]
  Claim1The cylindrical inspection object surface inspection apparatus according to the present invention sets a cylindrical inspection object in a rotatable manner, and makes the surface of the roller provided rotatably contact the surface of the inspection object with a predetermined pressure. In a surface inspection apparatus for a cylindrical object having an inspection unit for measuring a displacement amount of the roller corresponding to the shape of an object surface, the inspection unit intersects the displacement direction of the roller in a cross section perpendicular to the axis of the roller. Provide a moving mechanism to move in the directionThe test object is installed by being shifted from a linear extension line on which the central axis of the roller is displaced.A surface inspection apparatus for a cylindrical specimen characterized by the above.
[0020]
  Claim2The cylindrical surface inspection device according toIn claim 1,A moving mechanism for moving the inspection unit in a direction parallel to the central axis of the roller (longitudinal direction of the test object);furtherIt is provided.
[0021]
  Claim3The cylindrical surface inspection device according toClaim 1 or 2The inspection unit includes the roller detachably.
[0022]
  Claim4A surface inspection apparatus for a cylindrical object according to claim2The width of the roller is made to correspond to the test object having the maximum inspection standard.
[0024]
  Claim5The cylindrical surface inspection device according toClaims 1-4In any one of the above items, an optical inspection mechanism for inspecting the appearance of the test object is provided.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, embodiments of the present invention will be described with reference to the drawings.
  Embodiment1
  FIG. 1 shows the configuration of a surface inspection apparatus for a cylindrical specimen, wherein (a) is a plan view and (b) is a front view. This apparatus is for detecting a convex defect on both end surfaces of the photosensitive drum. In this apparatus, an apparatus having substantially the same structure as the convex defect detection apparatus 500 shown in FIG. That is, in FIG. 1, the inspection unit 10 includes a bottom plate 11, a fixed plate 12, a slide guide 13, a displacement measurement plate 14, a slider 14 a, a contact roller 15, a compression spring 16, and a distance displacement meter 17.
[0026]
This inspection unit 10 is parallel to the displacement direction of the contact roller 15 (the direction Ac of the line segment connecting the center point of the cross section perpendicular to the axis of the photosensitive drum 1 or 2 and the center point of the cross section perpendicular to the axis of the contact roller 15). A slide mechanism 20 is provided as a moving mechanism for moving in the direction. Two surface inspection apparatuses having such a configuration are arranged in parallel corresponding to both ends of the photosensitive drum. In the following description, for convenience of explanation, the upper end of the drawing among the both ends of the photosensitive drum may be referred to as “upper end” and the lower end may be referred to as “lower end”.
[0027]
In the slide mechanism 20, a motor 22 capable of forward / reverse rotation having a ball screw 23 connected to an output shaft is fixed on the base plate 21. A linear guide 24 is screwed onto the ball screw 23, and the inspection unit 10 is mounted on the linear guide 24. The ball screw 23 is provided such that its central axis is parallel to the direction Ac.
[0028]
When this surface inspection apparatus detects a convex defect at the end of the photosensitive drum 1 (large diameter) and 2 (small diameter), the inspection unit 10 is linearly rotated by rotating the ball screw 23 with the rotary motor 22. The guide 24 is moved forward together with the guide 24, and the contact roller 15 is brought into contact with the photosensitive drum with a predetermined pressure. At this time, the forward direction Aa of the linear guide 24, the forward direction Ab of the contact roller 15, and the direction Ac are parallel to each other (the same direction).
[0029]
Thus, in this surface inspection apparatus, the contact pressure is increased by appropriately setting the advance distance of the contact roller 15 in the case of the photosensitive drum 2 with a small diameter as compared with the case of the photosensitive drum 1 with a large diameter. Since they can be set to be the same, the detection sensitivity can be kept the same, and the height of the convex defect can be determined directly from the amount of displacement of the contact roller 15. Therefore, it is possible to deal with photosensitive drums having different diameters.
[0030]
  Embodiment2
  2A and 2B are plan views showing the configuration of a surface inspection apparatus for a cylindrical specimen. This surface inspection apparatus is a modification of the apparatus shown in FIG. The apparatus of FIG. 1 requires a large space in the left-right direction in this figure, and as a result, there is a problem that leads to an increase in the size of the inspection apparatus. Therefore, the inspection apparatus of FIG. 2 is characterized in that a slide mechanism 20 is provided that moves the inspection unit 10 in the Ad direction intersecting the displacement direction Ab of the roller in the cross section perpendicular to the axis of the contact roller 15. Other configurations are the same as those in FIG. 1, and can correspond to photosensitive drums having different diameters.
[0031]
When a convex defect is detected for the photosensitive drum 1 having a large diameter by this surface inspection apparatus, the direction Ab is parallel to the direction Ac as shown in FIG. In the case of the photosensitive drum 2 having a small diameter, the inspection unit 10 is advanced in the Ad direction by the slide mechanism 20 and the contact roller 15 is brought into contact with the photosensitive drum 2, so that the direction Ab as shown in FIG. Intersects the direction Ac.
In the case of FIG. 2A, since the direction Ab is parallel to the direction Ac, the displacement of the contact roller 15 itself can be determined as the height of the convex defect, and the movement of the contact roller 15 due to the convex defect becomes the smoothest. .
On the other hand, in the case of FIG. 2B, it is necessary to appropriately convert the displacement of the contact roller 15 to obtain the height of the convex defect, but sufficient detection sensitivity can be easily obtained.
[0032]
  Embodiment3
  FIG. 3 is a front view showing a configuration of a surface inspection apparatus for a cylindrical test object. In this apparatus, a lower end inspection unit 10a for detecting a convex defect at the lower end of the photosensitive drum 3 is directly provided on the base plate 31 (the inspection unit 10a does not move up and down). Further, the upper end inspection unit 10b for detecting a convex defect at the upper end of the photosensitive drum 3 is provided on a support column 32 suspended from the base plate 31, and the inspection unit 10b can be moved up and down in parallel with the longitudinal direction of the support column 32. By providing, the inspection unit 10 b can be moved in a direction parallel to the central axis of the contact roller 15. That is, a linear guide (slide guide) 33 is provided on the support column 32, a slider 34 that can be raised and lowered by an elevating mechanism (not shown), and a support plate 35 having an L-shaped cross section thereon. The upper end inspection unit 10b is provided. The configuration of the inspection units 10a and 10b is the same as that of the inspection unit 10 in FIG.
[0033]
When detecting the convex defect of the photosensitive drum 3 having various lengths, the contact height of the lower end position of the photosensitive drum 3 with respect to the contact roller 15a of the lower end inspection unit 10a is set as shown in FIG. Set the same.
Further, the upper end inspection unit 10 b moves the contact roller 15 b to the upper end of the photosensitive drum 3 by moving it up and down to an appropriate position by the lifting mechanism.
As described above, in this surface inspection apparatus, the upper end inspection unit 10b is moved up and down to appropriately set the height position, so that it is possible to cope with photosensitive drums having different lengths.
[0034]
  Embodiment4
  4 (a) and 4 (b) are front views showing the configuration of a surface inspection apparatus for a cylindrical specimen. This apparatus is configured so as to be compatible with various photosensitive drums having different end convex defect inspection widths, and the inspection unit is detachably provided with a contact roller unit including a contact roller and a supporting member thereof. There is a feature in the point. The inspection unit 41a shown in FIG. 4A includes a contact roller unit 42a provided with a contact roller 15c having a large width corresponding to the inspection width Wa of the photosensitive drum 4, and the inspection unit 41b of FIG. Corresponding to the inspection width Wb (Wa> Wb) of the photosensitive drum 4, a contact roller unit 42b provided with a contact roller 15d having a small width is provided. However, the overall configuration of these inspection units is the same as that of the inspection unit 10 of FIG. In this surface inspection apparatus, when the inspection width is Wa, the contact roller unit 42a is attached to constitute the inspection unit 41a, and when the inspection width is Wb, the contact roller unit 42b is attached to form the inspection unit 41b.
[0035]
  Embodiment5
  FIGS. 5A and 5B are front views showing the upper end inspection unit 51b constituting the surface inspection apparatus for the photosensitive drum. This surface inspection apparatus is a modification of the apparatus shown in FIG. 3 so that it can be applied to photosensitive drums having different end convex defect inspection widths. That is, the width of the contact roller 15 is set to the maximum value Wm of the end convex defect inspection width, and an elevating mechanism for moving the upper end inspection unit 51b to an appropriate height is provided. The contact roller of the lower-end inspection unit (not shown) is similarly configured, and the lower-end inspection unit can also be raised and lowered.
[0036]
When the above-mentioned apparatus is used to inspect the photosensitive drum having the maximum edge defect inspection width Wm, as shown in FIG. 5A, the upper end position of the contact roller 15 of the upper end inspection unit 51b is set to the photosensitive member. Align with the upper end position of the drum 4.
Further, when the end convex defect inspection width of the photosensitive drum is Wn smaller than the maximum value Wm, the contact roller 15 is raised by the difference between Wm and Wn as shown in FIG.
On the other hand, in the inspection unit for the lower end, when inspecting the photosensitive drum having the inspection width of the maximum value Wm, the lower end position of the contact roller is aligned with the lower end position of the photosensitive drum in reverse to the above, and the inspection width is Wn. In this case, the contact roller is lowered by the difference between Wm and Wn.
[0037]
  Embodiment6
  FIG. 6 is a front view showing the configuration of the surface inspection apparatus for the photosensitive drum. This device is designed to be compatible with photoreceptor drums with different diameters, lengths, and edge convex defect inspection widths, and combines the components of the surface inspection devices shown in FIGS. 1, 3, and 4 respectively. Configured.
[0038]
That is, the support pillars 32 are provided on the linear guide 24, and these can be moved back and forth integrally by the slide mechanism 20. A lower end inspection unit 10 a having a contact roller 15 a detachably attached thereto is fixed on the linear guide 24.
Further, the upper end inspection unit 10b provided with the contact roller 15b is detachably provided on the support column 32 by an elevating mechanism (not shown). The slide mechanism 20 corresponds to the first moving mechanism, and the lifting mechanism provided on the support column 32 corresponds to the second moving mechanism.
The operational effects of the inspection apparatus shown in FIG. 6 will be apparent from the description of the apparatus shown in FIGS.
[0039]
In the present invention, by appropriately combining the components of the apparatus shown in FIGS. 1 to 5, various types of surface inspection apparatuses can be configured as follows, for example.
(1) A combination of the components of each device in FIG. 1 and FIG.
(2) A combination of the components of each device in FIG. 1, FIG. 3, and FIG.
(3) A combination of the components of each device in FIG. 2 and FIG.
(4) A combination of the components of each device in FIG. 2 and FIG.
(5) A combination of the components of each device shown in FIGS.
According to the apparatus of (1), it is possible to deal with photosensitive drums having various diameters and lengths, and the apparatus of (2) can cope with photosensitive drums having different diameters, lengths and inspection widths. The apparatus of (3) can cope with photosensitive drums having different diameters and lengths, and the apparatus can be miniaturized. (4) In the apparatuses of (5), photosensitive bodies having different diameters and inspection widths. In addition to being compatible with drums, the size of the apparatus can be reduced.
[0040]
  Embodiment7
  FIG. 7 is a schematic plan view showing the configuration of the surface inspection apparatus for the photosensitive drum. This apparatus is provided with an optical inspection mechanism for inspecting the appearance of a photosensitive drum in the apparatus shown in FIGS. In FIG. 7, 61 extends in the longitudinal direction of the photosensitive drum 5.lineA light source, 62 is a lens, and 63 is a line sensor camera. The photosensitive drum 5 is rotatable by a rotation drive mechanism (not shown) as shown in FIG. In this surface inspection apparatus, the photosensitive drum 5 is rotated by the rotational drive mechanism.lineLight is applied from the light source 61 to the application surface of the photosensitive drum 5, and the reflected light is received by the line sensor camera 63 via the lens 62. Thereby, the edge convex defect inspection of the photosensitive drum 5 and the appearance inspection of the coated surface over the entire drum surface can be performed simultaneously.
[0041]
Each of the above embodiments relates to an apparatus for inspecting a convex defect at the end of a photosensitive drum. However, the surface inspection apparatus for a cylindrical specimen according to the present invention is not limited to this, and various cylindrical body outer peripheral surfaces. It can also be configured as an apparatus for detecting the uneven state and scratches of the surface, or measuring the roundness thereof.
[0042]
【The invention's effect】
  As is apparent from the above description, the present invention provides the following effects.The
  In this surface inspection apparatus for a cylindrical specimen, a moving mechanism for moving the inspection unit in a direction parallel to the displacement direction of the contact roller due to contact between the contact roller and the cylindrical specimen is provided. Convex defect inspection, uneven state and scratch detection, or roundness measurement can be performed on different specimens, and it is possible to accurately deal with specimens of various diameters.
[0043]
  Of the present inventionIn the surface inspection apparatus, since the moving mechanism for moving the inspection unit in a direction intersecting the displacement direction of the contact roller in the cross section perpendicular to the axis of the contact roller is provided, in addition to the above-described effect by the surface inspection apparatus of claim 1, Compared with item 1, there is an effect that the entire apparatus can be reduced in size.
[0044]
  Of the present inventionIn the surface inspection apparatus, since the moving mechanism for moving the inspection unit in a direction parallel to the central axis of the contact roller is provided, it is possible to cope with test objects having different lengths.
[0045]
  Of the present inventionIn the surface inspection apparatus, since the inspection unit is detachably provided with the contact roller, it is possible to deal with specimens having different inspection widths by exchanging and attaching contact rollers having large and small widths. .
[0046]
  Of the present inventionIn the surface inspection device, since the width of the contact roller corresponds to the test object having the maximum inspection standard (the inspection width is maximum), and the moving mechanism for moving the inspection unit in the direction parallel to the central axis of the contact roller is provided. It is possible to deal with specimens having different inspection widths.
[0047]
  Of the present inventionThe surface inspection apparatus includes a first movement mechanism that moves the inspection unit in a direction parallel to the displacement direction of the contact roller, and a second movement mechanism that moves the inspection unit in a direction parallel to the central axis of the contact roller. Furthermore, since the contact roller is detachably attached to the inspection unit, it is possible to deal with test objects having different diameters, lengths, and inspection widths.
[0048]
  Of the present inventionIn surface inspection equipment,Claims 1-4Since any of these apparatuses is provided with an optical inspection mechanism for inspecting the appearance of the test object, it is possible to perform a convex defect inspection on the surface of the test object and an appearance inspection of the surface at the same time.
[0049]
  ThisAs described above, according to the present invention, it is possible to accurately inspect a convex defect on the surface of a cylindrical test object with a simple configuration and a simple operation.
[Brief description of the drawings]
FIGS. 1A and 1B show a configuration of a first embodiment of the present invention, where FIG. 1A is a plan view and FIG. 1B is a front view.
FIG. 2 is a plan view showing a configuration of a second embodiment of the present invention.
FIG. 3 is a front view showing a configuration of a third embodiment of the present invention.
FIG. 4 is a front view showing a configuration of a fourth embodiment of the present invention.
FIG. 5 is a front view showing a configuration of a fifth embodiment of the present invention.
FIG. 6 is a front view showing a configuration of a sixth embodiment of the present invention.
FIG. 7 is a schematic plan view showing the configuration of a seventh embodiment of the present invention.
FIG. 8 is a cross-sectional view showing a main configuration of an electrophotographic copying machine.
FIGS. 9A and 9B show an example of a photosensitive drum provided in the copier of FIG. 8, in which FIG. 9A is a front view and FIG. 9B is a partially enlarged view of FIG.
FIG. 10 is a schematic configuration diagram showing a conventional example of an abnormality detection device for the surface of a photosensitive drum.
FIG. 11 is a schematic configuration diagram showing a conventional example of a defect detection device on the surface of a photosensitive drum.
FIGS. 12A and 12B show a configuration of a convex defect detecting device on the surface of the end of the photosensitive drum under investigation by the present inventor, wherein FIG. 12A is a plan view and FIG. 12B is a front view.
13 is a schematic explanatory diagram showing a configuration of a photosensitive drum support rotating device used in combination with the detection device of FIG. 12. FIG.
14 is a graph showing an example of a detection result obtained by the detection device of FIG.
[Explanation of symbols]
1-5 Photosensitive drum
10 Inspection unit
10a Inspection unit for lower end
10b Upper end inspection unit
11 Bottom plate
12 Fixed plate
13 Slide guide
14 Displacement measuring plate
14a slider
15 Contact roller
15a Contact roller
15b Contact roller
15c contact roller
15d contact roller
16 Compression spring
17 Distance displacement meter
20 Slide mechanism
21 Base plate
22 Rotating motor
23 Ball screw
24 Linear guide
31 Base plate
32 props
33 Linear guide (slide guide)
34 Slider
35 Support plate
41a Inspection unit
41b Inspection unit
42a Contact roller unit
42b Contact roller unit
51b Upper end inspection unit
61 line light source
62 lenses
63 Line sensor camera
500 Convex defect detector
501 Bottom plate
502 fixed plate
503 Linear guide (slide guide)
504 Displacement measurement board
504a slider
505 Contact roller
506 Compression spring
507 Distance displacement meter
510 Photosensitive drum
511 chuck
512 chuck
513 coupling
514 Rotation motor

Claims (5)

A cylindrical specimen is set so as to be rotatable, the surface of the roller provided rotatably is brought into contact with the surface of the specimen at a predetermined pressure, and the displacement of the roller corresponding to the shape of the specimen surface is determined. In a surface inspection apparatus for a cylindrical object having an inspection unit for measuring, a moving mechanism is provided for moving the inspection unit in a direction crossing the displacement direction of the roller in a cross section perpendicular to the axis of the roller . A surface inspection apparatus for a cylindrical object to be detected, which is installed by being shifted from a linear extension line on which the central axis of the roller is displaced . 2. The surface inspection apparatus for a cylindrical object according to claim 1, further comprising a moving mechanism for moving the inspection unit in a direction parallel to a central axis of the roller. 3. The surface inspection apparatus for a cylindrical object according to claim 1, wherein the inspection unit includes the roller detachably. 3. The surface inspection apparatus for a cylindrical object according to claim 2, wherein the width of the roller corresponds to the object having the maximum inspection standard. 5. The surface inspection apparatus for a cylindrical object according to claim 1, further comprising an optical inspection mechanism for inspecting the appearance of the object.

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