JP2004066395A - Machining method and device for shaft member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate various fault in clamping a large diameter part with a collet chuck when machining the outer circumferential surface of a small diameter part projected from a side end face of a large diameter part taking the large diameter part for a reference gauge. <P>SOLUTION: This machining device machining the outer circumferential surface of a small diameter part 16 of a shaft member concentrically with a large diameter part 14 has receiving rollers 22R abutting on and supporting the outer circumferential surface of the large diameter part 14 where two sets of the rollers are disposed apart from each other where one pair of the rollers forms one set, two pressure rollers 59R disposed opposite to the receiving rollers 22R and capable of clamping the large diameter part 14 with receiving rollers 22R, a roller moving means reciprocating the pressure rollers 59R along the direction opposite to the receiving rollers 22R, a roller rotating and driving means rotating and driving the pressure rollers 59R, a tool holder 18R equipped with a tool, a machining depth adjustment means for adjusting the machining depth of the tool 17 to the outer circumferential surface of the small diameter part 16, and a feeding drive means to feed the tool 17 attached to the tool holder 18R along a rotational axis of the large diameter part 14. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method and an apparatus for processing a shaft member having a large-diameter portion and a small-diameter portion protruding from at least one end face of the large-diameter portion.
[0002]
[Prior art]
In various industrial devices handling web-shaped members and sheet-shaped members, shaft members having a large-diameter portion and a small-diameter portion protruding from at least one end face of the large-diameter portion are frequently used as various rotating parts. I have. For example, in an electrophotographic apparatus such as a laser printer, as shown in FIG. 13 showing a schematic structure of the apparatus, image information is exposed through an image forming lens 1 of an exposure apparatus using a laser, an LED, or the like. An electrophotographic photosensitive drum 2 on which a latent image is formed, a charging roller 3 for charging the surface of the electrophotographic photosensitive drum 2, a developing sleeve 5 for supplying toner 4 to the electrophotographic photosensitive drum 2, and a developing sleeve 5 Transfer roller 7 for transferring the toner image of the electrostatic latent image formed on the surface of the electrophotographic photosensitive drum 2 to the print medium 6, and transporting the print medium 6 between the electrophotographic photosensitive drum 2 and the transfer roller 7 And a pair of fixing rollers 9 for fixing the toner image transferred to the print medium 6 to the print medium 6. Each of these is also a mandrel portion 2a bearing (not shown) is fitted, 3a, 5a, 7a, 8a, and comprises 9a to its side end surfaces.
[0003]
In the developing sleeve 5 described above, it is necessary to maintain a constant positional relationship with the electrophotographic photosensitive drum 2 in order to form a high-definition image, and these mandrel portions 5a and 2a are connected to the housing via bearings. By rotatably fixing the position, these positional relations are guaranteed with a predetermined accuracy. In order to respond to the recent demand for higher definition image quality, the outer peripheral surface of the developing sleeve 5 requires extremely high straightness and runout accuracy. Specifically, the straightness along the rotation axis direction is 10 μm or less. It is required that the amount of deflection at the central portion with respect to the center of both end surfaces be 10 μm or less. Further, in order to maintain the relative position with respect to the electrophotographic photosensitive drum 2 with high accuracy, it is required that the amount of deflection of the central portion of the outer peripheral surface of the developing sleeve 5 with respect to the center of the mandrel 5a is also within 15 μm. .
[0004]
Usually, the developing sleeve is formed of an aluminum alloy, stainless steel, or the like. In the case of the aluminum alloy, the developing sleeve is formed into a cylindrical shape having a substantially desired inner and outer diameter by extrusion or drawing. When formed of stainless steel, a stainless steel plate that has been rolled in advance to a desired thickness is rolled into a cylindrical shape by roll forming, and the butted portion is welded into a cylindrical shape. The cylindrical material thus formed into a cylindrical shape is cut into a desired length, a first flange member is press-fitted into one end in the longitudinal direction as one mandrel, and the other end in the longitudinal direction is pressed. The fitting portion for fitting the second flange member as the other mandrel is finished by machining. Thereafter, the outer peripheral surface of the developing sleeve is finished. Specifically, as described in JP-A-6-328301, the developing sleeve is held in a state where one of the mandrel portions (first flange member) and the other end in the longitudinal direction of the developing sleeve are held. After rotation, the outer peripheral surface of the developing sleeve is processed by turning, centerless grinding, cylindrical grinding, or the like, and then, through a cleaning process, the outer peripheral surface of the developing sleeve is subjected to blast processing and surface treatment such as application of an insulating film. Thereafter, a magnet roller is inserted into the developing sleeve from the other end in the longitudinal direction of the developing sleeve, and the other mandrel (second flange member) is fitted to the other end in the longitudinal direction of the developing sleeve. Shrink fit the joint.
[0005]
In this state, the amount of deflection of the outer peripheral surface of the developing sleeve with respect to the pair of mandrel portions is about 20 μm to 30 μm due to the eccentricity and inclination of the central axis of the pair of mandrel portions with respect to the rotation axis of the developing sleeve. Therefore, the accuracy required for the developing sleeve for high definition image quality described above cannot be satisfied as it is. For this reason, it is necessary to machine the bearing fitting portions of the pair of mandrel portions with higher precision based on the outer peripheral surface of the finished developing sleeve.
[0006]
As described above, when the outer peripheral surface of the small-diameter portion protruding from at least one of the side end surfaces of the shaft member needs to be processed with high precision with reference to the large-diameter portion in which the outer peripheral surface of the shaft member is previously processed with high precision. In this case, it is common to use a collet chuck to grip the processed outer peripheral surface of the large-diameter portion, and in this state, drive the shaft member together with the collet chuck to turn the outer peripheral surface of the small-diameter portion.
[0007]
[Problems to be solved by the invention]
When the outer peripheral surface of the small-diameter portion protruding from at least one side end surface of the shaft member needs to be processed with high precision with reference to the large-diameter portion whose outer peripheral surface has been processed with high precision in advance, for example, as shown in FIG. In the developing sleeve 5, it is necessary to use a collet chuck to grip the outer peripheral surface of the developing sleeve, but it is necessary to adjust the center of the inscribed circle of the collet chuck and the rotation center axis of the main shaft of the driving machine tool coaxially. In addition to this, the time and labor required for this purpose are increased, and a machine tool that can incorporate a collet chuck for gripping a large-diameter developing sleeve is inevitably large in size, which imposes a heavy burden on equipment investment.
[0008]
In addition, the outer peripheral surface of the developing sleeve may be damaged by the gripping force of the collet chuck, and therefore, it is necessary to perform further correction processing on the outer peripheral surface of the developing sleeve, which increases the processing cost.
[0009]
Further, it is necessary to prepare a collet chuck corresponding to the outer diameter of the developing sleeve every time, and there is a drawback that the cost is increased.
[0010]
Such a problem is not limited to the developing sleeve 5 shown in FIG. 13, and the large-diameter portion such as the electrophotographic photosensitive drum 2, the charging roller 3, the transfer roller 7, the print medium conveying roller 8, and the fixing roller 9 This may be a common problem when a shaft member having a small-diameter portion protruding from at least one end face of the large-diameter portion is processed with high precision.
[0011]
[Object of the invention]
An object of the present invention is to provide a shaft member having a large-diameter portion and a small-diameter portion protruding from at least one end surface of the large-diameter portion. An object of the present invention is to provide a method capable of easily and accurately processing an outer peripheral surface of a small diameter portion while suppressing damage to a surface, and a compact and simple apparatus capable of realizing the method.
[0012]
[Means for Solving the Problems]
A first aspect of the present invention is a method of processing a shaft member having a large diameter portion and a small diameter portion protruding from at least one end face of the large diameter portion, wherein an outer peripheral surface of the large diameter portion is fixed to a predetermined true shape. Processing the circular portion, rolling the large-diameter portion processed to a predetermined circularity, and rolling the large-diameter portion on the outer peripheral surface of the small-diameter portion to the large-diameter portion. And a step of processing concentrically.
[0013]
A second aspect of the present invention is a method of processing a shaft member having a large-diameter portion and a small-diameter portion protruding from at least one end surface of the large-diameter portion, wherein the large-diameter portion has a predetermined roundness. Pressing the plurality of rollers against the outer peripheral surface of the diameter portion to clamp the large diameter portion, and driving at least one of the plurality of rollers to clamp the large diameter portion between the plurality of rollers. Rotating the same in a state, pressing a tool against the outer peripheral surface of the small diameter portion, feeding the tool along the rotation axis of the large diameter portion, and concentrically placing the outer peripheral surface of the small diameter portion with the large diameter portion. And a step of processing into a shape.
[0014]
A third aspect of the present invention is a method of processing a shaft member having a large-diameter portion and a small-diameter portion protruding from at least one end face of the large-diameter portion, wherein the large-diameter portion is formed into a predetermined roundness. Pressing the plurality of rollers against the outer peripheral surface of the diameter portion to clamp the large diameter portion, and driving at least one of the plurality of rollers to clamp the large diameter portion between the plurality of rollers. Rotating the same in a state, pressing a tool against the outer peripheral surface of the small diameter portion, feeding the tool along the rotation axis of the large diameter portion, and concentrically placing the outer peripheral surface of the small diameter portion with the large diameter portion. Machining, the feed direction of the tool is inclined with respect to the rotation axis of the large-diameter portion, and the tool is shifted from the rotation axis of the large-diameter portion toward the distal end with respect to the base end of the small-diameter portion. Characterized in that the distance to the machining point is set short. A.
[0015]
According to a fourth aspect of the present invention, an outer peripheral surface of the small-diameter portion of a shaft member having a large-diameter portion and a small-diameter portion protruding from at least one side end face of the large-diameter portion is processed concentrically with the large-diameter portion. A pair of receiving rollers, each pair of which is spaced apart and abuts against the outer peripheral surface of the large diameter portion to support it, and a pair of receiving rollers each of which opposes the two sets of receiving rollers. Two pressing rollers that are arranged in such a manner that the large-diameter portion can be sandwiched by the two sets of receiving rollers, and a roller moving unit that reciprocates the two pressing rollers along a direction facing the receiving rollers. A roller rotation driving means for driving and rotating at least one of the two pressing rollers; a tool holder on which a tool for processing an outer peripheral surface of the small diameter portion is mounted; and a processing of the outer peripheral surface of the small diameter portion by the tool. Adjust depth A machining depth adjusting means for, is characterized in that comprising a feed drive means for providing a feed along said axis of rotation of the large diameter portion to a tool attached to the tool holder.
[0016]
According to the present invention, the large-diameter portion of the shaft member, the outer peripheral surface of which has been processed to a predetermined roundness in advance, is placed on a receiving roller, and the roller moving means is driven to advance the pressing roller toward the receiving roller, thereby forming the large-diameter portion. To press the large diameter portion of the shaft member between the receiving roller and the pressing roller. In this state, the pressing roller is driven and rotated by the roller rotation driving means, and the large diameter portion is rotated together with the receiving roller. On the other hand, a feed holder is provided with a tool holder on which a tool having an appropriate setting of the processing depth with respect to the outer peripheral surface of the small-diameter portion by the processing-depth adjusting means is fed by the feed driving means along the rotation axis of the large-diameter portion, and the large-diameter portion is moved. The outer peripheral surface of the small diameter portion is removed along the rotation axis of the large diameter portion with reference to the outer peripheral surface of the large diameter portion.
[0017]
A fifth aspect of the present invention resides in a shaft member manufactured by the method according to the first to third aspects of the present invention or using an apparatus according to the fourth aspect of the present invention.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
In the shaft member processing method according to the first aspect of the present invention, the step of rolling the large-diameter portion includes pressing a plurality of rollers against the outer peripheral surface of the large-diameter portion to clamp the large-diameter portion. It may be performed by driving at least one of the rollers.
[0019]
In the method for processing a shaft member according to the first to third embodiments of the present invention, the plurality of rollers include at least two sets of rollers that are spaced apart along the rotation axis, and the two sets of rollers are provided. It is preferable that the group is brought into contact with both side edges of the large diameter portion. In this case, each roller group can have a pair of receiving rollers that support the large-diameter portion, and a pressing roller that presses the large-diameter portion toward the pair of receiving rollers. The roller may be a pressing roller.
[0020]
The method may further include a step of causing a pair of pressing rollers capable of contacting both end surfaces of the large-diameter portion to be in close proximity to both end surfaces of the large-diameter portion.
[0021]
The large-diameter portion is at least one of a print-medium conveying roller, an electrophotographic photosensitive drum, a developing sleeve, and a fixing roller in an image forming apparatus that forms an image on a print medium using toner, and the small-diameter portion is a rotating shaft of these. It may be.
[0022]
In the method for processing a shaft member according to the second or third aspect of the present invention, the method may further include a step of suction-removing the processing chips removed by the tool from the processing area.
[0023]
When the shaft member has two small-diameter portions projecting in opposite directions from both end surfaces of the large-diameter portion, it is preferable that the feeding directions of the two tools with respect to these two small-diameter portions are opposite to each other so that the feeding is performed simultaneously.
[0024]
The tool may be a turning tool, or an end mill or grinding wheel having a rotating axis extending along the rotating axis of the large diameter portion and being driven to rotate. In this case, it is preferable that the rotation axis of the end mill or the grinding wheel is set in parallel with the feed direction.
[0025]
In the shaft member processing apparatus according to the fourth aspect of the present invention, it is possible to further include a pair of pressing rollers capable of contacting both end surfaces of the large diameter portion. In this case, the relative position between the one pressing roller and one set of receiving rollers can be kept constant, and the relative position of the other pressing roller with respect to the other set of receiving rollers can be changed between the processing position and the retracted position. May be.
[0026]
The apparatus may further include a processing chip removing unit for suctioning and removing the processing chip removed by the tool from the processing area.
[0027]
One set of receiving rollers and one corresponding pressing roller may be movable in a direction parallel to the rotation axis according to the length of the large-diameter portion.
[0028]
Two sets of receiving rollers and two pressing rollers may be able to sandwich both side edges of the large diameter portion.
[0029]
When the shaft member has two small-diameter portions projecting in opposite directions from both end faces of the large-diameter portion, two tool holders, two machining-depth adjusting means, and two feed-driving means are provided corresponding to the two small-diameter parts. The feed movement directions of the two tool holders by the two feed drive units may be opposite directions.
[0030]
The tool is a turning tool or an end mill or a grinding wheel having a rotation axis extending along the rotation axis of the small diameter portion, and further includes a tool driving motor mounted on a tool holder for driving and rotating the end mill or the grinding wheel. be able to. In this case, the rotation axis of the end mill or the grinding wheel can be set in parallel with the feed movement direction of the tool holder.
[0031]
The feed movement direction of the tool holder is inclined with respect to the rotation axis of the small-diameter portion, and the distance from the rotation axis of the large-diameter portion to the processing point of the tool can be set shorter toward the distal end with respect to the base end of the small-diameter portion. .
[0032]
The large-diameter portion is at least one of a print-medium conveying roller, an electrophotographic photosensitive drum, a developing sleeve, and a fixing roller in an image forming apparatus that forms an image on a print medium using toner, and the small-diameter portion is a rotating shaft of these. It may be.
[0033]
In the shaft member according to the fifth aspect of the present invention, the shaft member includes a print medium transport roller, an electrophotographic photosensitive drum, a developing sleeve, and a fixing roller in an image forming apparatus for forming an image on a print medium using toner. At least one of the following.
[0034]
【Example】
An embodiment in which the shaft member processing apparatus according to the present invention is applied to processing of a developing sleeve incorporated in an electrophotographic apparatus will be described in detail with reference to FIGS. 1 to 12, but the present invention is not limited to these examples. However, all changes and modifications included in the concept of the present invention described in the claims of this specification are possible, and therefore, can naturally be applied to other technologies belonging to the spirit of the present invention. .
[0035]
The front shape of the processing apparatus in this embodiment is shown in FIG. 1 in a broken state, the left side shape is shown in FIG. 2, and the planar shape is shown in a broken state in FIG. That is, a base plate 13 installed on the floor 12 via a plurality of (four in the illustrated example) pedestals 11 has a work stand 15 on which a developing sleeve 14 as a work is placed, and a work stand 15. A pair of tool holders 18 </ b> L and 18 </ b> R to which turning tools 17 for turning the small-diameter portion of the developing sleeve 14 to be placed, that is, the outer peripheral surface of the mandrel portion 16, are provided.
[0036]
FIG. 4 is an enlarged cross-sectional view taken along the line IV-IV in FIG. 2, and FIG. 5 shows a right side view thereof, and FIG. 6 shows a cross-sectional view taken along the line VI-VI in FIG. Show. That is, the work stand 15 in this embodiment includes a stand base 19 fixed to the base plate 13, a pair of roller holders 20L and 20R for mounting the developing sleeve 14, and respective roller holders 20L and 20R (hereinafter simply referred to as 20R). And a pair of receiving rollers 22L and 22R, which are rotatably supported so that the rotating shafts 21 are horizontal and receive both side edges of the developing sleeve 14, and brackets 23L and 23L, respectively. The rotating shaft 24 is rotatably supported so as to be vertical through 23R, and includes a pair of pressing rollers 25L and 25R with which the side end surfaces of the mandrel 16 can abut.
[0037]
One roller holder 20L is integrally fixed to one end of the stand base 19, and a bracket 23L that rotatably supports one pressing roller 25L corresponding to the fixed roller holder 20L is connected to one end of the stand base 19. It is integrally connected to a position switching cylinder 26 provided on the side, and can be switched between a processing position indicated by a two-dot chain line and a retracted position indicated by a solid line in FIG. A supply source of compressed air (not shown) is connected to the position switching cylinder 26 via a switching valve (not shown).
[0038]
The other roller holder 20R is slidably engaged in a direction parallel to the rotation axis of the receiving roller 22R (the left-right direction in FIG. 4) along a holder guide rail 27 fixed to the other end of the stand base 19. A clamp device 28 for fixing the movable roller holder 20R at an arbitrary position on the holder guide rail 27 in accordance with the length of the developing sleeve 14 is incorporated between them. Therefore, regardless of the length of the large-diameter portion of the developing sleeve 14, that is, the shaft member, the receiving rollers 22L and 22R (hereinafter, sometimes simply referred to as 22) are always reliably applied to both side edges. Can be in contact. Incidentally, the distance between the fixed-side receiving roller 22L and the movable-side receiving roller 22R is set to be equal to or shorter than the length of the developing sleeve 14 by about 20 mm in order to prevent vibration during turning. Is effective in A bracket 23R that rotatably supports the other pressing roller 25R corresponding to the movable roller holder 20R is integrally fixed to the movable roller holder 20R.
[0039]
In this way, by making the receiving roller 22 abut only on both side edges of the developing sleeve 14, only the side edges of the outer peripheral surface of the developing sleeve 14 that are not substantially involved in the developing operation can be damaged. Since there is only a property, and biting like a collet chuck does not occur, even if damaged, it can be made very small. Further, it is not necessary to keep the pair of pressing rollers 25L, 25R (hereinafter sometimes simply referred to as 25) in contact with both side end surfaces of the mandrel 16 at all times. There is no problem with the play.
[0040]
A part of one tool holder 18R in the present embodiment is extracted and enlarged and is shown in a partially broken state in FIG. 7, and its plan shape is shown in a partially broken state in FIG. 8, and a cross section taken along the line IX-IX in FIG. FIG. 9 shows the structure in a partially broken state. That is, the pair of tool holders 18L and 18R (hereinafter, may be simply referred to as 18) in the present embodiment have basically the same configuration, but the other tool holder 18L has its base block 29L. While one tool holder 18R is integrally fixed to one end of the base plate 13, one of the tool holders 18R moves along a block guide rail 31 on which a slider 30 provided on the base block 29R is mounted on the other end of the base plate 13. The movable tool holder 18R is slidably engaged in a direction parallel to the sliding direction of the movable roller holder 20R, and the movable tool holder 18R is placed at an arbitrary position on the block guide rail 31 in accordance with the length of the developing sleeve 14. A clamping device 32 for fixing is incorporated between them.
[0041]
The individual tool holders 18 in the present embodiment include, in addition to the base blocks 29L and 29R described above, a frame 33 mounted on these base blocks 29L and 29R (hereinafter sometimes simply referred to as 29). , A pair of slider guide rails 34 mounted on the upper end of the frame body 33 in parallel with each other, and a pair of sliders 35 mounted via a pair of sliders 35 slidably mounted on the pair of slider guide rails 34, respectively. A table 36, a tool rest 38 integrally mounted on a slide table 36 slidable along a slider guide rail 34, to which the turning tool 17 is detachably fixed via a plurality of bolts 37; The two ends are rotatably supported by a pair of end plates 39 integrally fixed to both ends in the longitudinal direction of the slider guide rail 34, respectively. And a screw shaft drive that is fixed to one of a pair of end plates 39 via a bracket 41 and is connected to a base end of the feed screw shaft 40 via a joint 42 so as to be capable of reversible rotation. The motor includes a motor 43 and a feed nut 44 provided integrally with the slide table 36 and screwed with the feed screw shaft 40.
[0042]
In the present embodiment, a plurality of types of dedicated tool rests 38 are prepared in advance in accordance with the dimensions of the developing sleeve 14 and the mandrel 16 and are replaced with the slide table 36 as necessary. A versatility can be provided by incorporating a position adjusting mechanism. Similarly, in this embodiment, the projecting amount of the turning tool 17 from the tool post 38 can be defined by a plurality of bolts 37 mounted on the tool post 38, but the tool post 38 is orthogonal to the slider guide rail 34. The position of the tool rest 38 with respect to the slide table 36 may be finely adjusted using a feed screw or the like.
[0043]
A pivot pin 45 is vertically attached to one end of the base block 29 and the frame 33 so that the frame 33 can rotate with respect to the base block 29 around the pivot pin 45. Has become. On the other end side of the base block 29, an elongated hole 46 extending in a direction perpendicular to the center axis of the feed screw shaft 40 is formed, and an adjusting pin 47 passing through the elongated hole 46 is connected to the other end of the frame 33. Screwed to the side. A pair of adjusting screws 48 that face in a straight line with an adjusting pin 47 therebetween in parallel with the extending direction of the elongated hole 46 are screwed to the base block 29. Therefore, the turning position of the frame 33 around the pivot pin 45 can be finely changed by adjusting the screwing amount of the pair of adjusting screws 48.
[0044]
When the rigidity of the mandrel 16 is sufficiently high, it is general that the rotation axis of the feed screw shaft 40 is parallel to the rotation axis of the developing sleeve 14 placed on the receiving roller 22 of the work stand 15. In the case where the cutting depth of the turning tool 17 is large and the rigidity of the mandrel 16 is insufficient, the distal end side of the mandrel 16 is elastically deformed by the working pressure and escapes. There is a case where the actual cutting amount on the tip side of the head becomes insufficient and a machining error occurs in which the mandrel 16 becomes thick. In such a case, the direction of feed movement of the tool rest 38 along the slider guide rail 34 is tilted with respect to the rotation axis of the developing sleeve 14 mounted on the roller 22 so as to be inclined with respect to the base end of the core 16. The distance from the rotation axis of the developing sleeve 14 to the tip of the turning tool 17, that is, the processing point, is set to be shorter toward the tip end, and the cutting depth tends to increase toward the tip end of the mandrel 16. By performing the processing, the shape error of the outer peripheral surface of the mandrel 16 can be further reduced.
[0045]
In this embodiment, a turning tool 17 is mounted in a protruding blade state with respect to the rotation direction of the developing sleeve 14 in order to suppress scattering of chips during processing. From such a viewpoint, it is effective to locate the opening of the dust collection duct near the processing area and to suction-remove chips and the like from the processing area.
[0046]
The upper ends of a plurality (four in the illustrated example) of columns 49 implanted vertically in the base plate 13 are integrally connected by a top plate 50, and a column 49 is provided between the top plate 50 and the base plate 13. An elevating plate 52 is arranged so as to be able to ascend and descend via sliding bushings 51 which are respectively slidably fitted to each other. A lower end of a piston rod 54 projecting downward from an elevating plate driving cylinder 53 attached to the top plate 50 is connected to the elevating plate 52 via a bracket 55. An air supply source is connected via a pressure regulating valve (not shown).
[0047]
In this embodiment, the lower ends of a pair of stopper rods 56 whose upper ends are slidably penetrated through the top plate 50 are fixed to the elevating plate 52 with a space therebetween, and a head 57 formed on the upper ends of these stopper rods 56 is locked. By fixing the possible stopper ring 58 to the top plate 50, even if the lifting plate drive cylinder 53 cannot lift the lifting plate 52 for some reason, the head 57 of the stopper rod 56 can be fixed to the stopper ring 58. The lower end position of the elevating plate 52 is mechanically regulated, so that collision between the receiving roller 22 and pressing rollers 59L and 59R described later can be avoided.
[0048]
A pair of shaft support brackets 60 are fixed downward to the elevating plate 52 at a distance from each other. Both ends of a roller drive shaft 61 extending parallel to the rotation axis of the receiving roller 22 are attached to the pair of shaft support brackets 60. And both ends of a pressing roller shaft 62 located directly above the work stand 15 and extending in parallel with the roller driving shaft 61 are rotatably supported. One end of the roller drive shaft 61 is connected to a roller drive motor 64 via a joint 63, and the roller drive motor 64 is fixed to one end of the lifting plate 52 via a bracket 65. Pulleys 66 are fixed to both ends of the roller drive shaft 61 and both ends of the pressing roller shaft 62, respectively, and endless belts 67 are wound around these pulleys 66, respectively. In this embodiment, an idle pulley 68 is rotatably attached to the shaft support bracket 60 between the roller drive shaft 61 and the pressing roller shaft 62 in order to remove the slack of the endless belt 67.
[0049]
A pressing roller 59L facing one receiving roller 22L is fixed to one end of the pressing roller shaft 62, and a pressing roller 59R facing the other receiving roller 22R is provided at the other end of the pressing roller shaft 62. It is slidably mounted along the longitudinal direction of the pressing roller shaft 62, and can be fixed by a set screw 69 at an arbitrary position on the other end side of the pressing roller shaft 62 in accordance with the position of the other receiving roller 22R. ing. In order to prevent the occurrence of scratches and dents on the outer peripheral surface of the developing sleeve 14 during pressurization, in the present embodiment, the outer peripheral portions of the pressing rollers 59L and 59R (hereinafter, these may be simply referred to as 59). Is made of an elastic body 70 such as urethane rubber, which is softer than the material forming the outer peripheral surface of the developing sleeve 14.
[0050]
The lifting plate driving cylinder 53 is in contact with a retracted position where the pressing roller 59 is pulled up above the receiving roller 22 and waits, and abuts against both side edges of the developing sleeve 14 placed on the receiving roller 22 to hold the pressing roller 59 at a predetermined position. The lifting plate 52 can be moved up and down to the work position where it is pressed against the receiving roller 22 by the pressure of the pressure roller. However, even if the large diameter portion of the shaft member, that is, the outer diameter of the developing sleeve 14 changes, the pressing roller 59 is used. The air pressure supplied to the lifting plate drive cylinder 53 is controlled so that the pressing force does not change.
[0051]
A switch plate 71 is provided upright at the front end of the base plate 13, and a pair of a start switch 72 and an emergency stop switch 73 are attached to the switch plate 71. The pair of start switches 72 in this embodiment are operated simultaneously to drive the position switching cylinder 26 and the elevating plate driving cylinder 53 to move the holding roller 25 and the pressing roller 59 to the processing positions, respectively, The shaft driving motor 43 is driven to rotate the developing sleeve 14 together with the receiving roller 22 via the pressing roller 59 so that the turning sleeve 17 is fed and moved by driving the roller driving motor 64. The emergency stop switch 73 is for immediately stopping the operations of the cylinders 26 and 53 and the drive motors 43 and 65 even during machining.
[0052]
When turning the core portion 16 of the developing sleeve 14, first, the pressing roller 25R and the pressing roller 59R on the movable side are previously held at their retracted positions, and the movable side is adjusted to the dimension of the developing sleeve 14 to be processed. The positions of the receiving roller 22R and the corresponding pressing roller 59R on the movable side are adjusted in advance. Further, the tool rest 38 is held at the machining start position, and the amount of projection of the turning tool 17, that is, the cutting depth of the developing sleeve 14 to be machined with respect to the mandrel 16 is adjusted so as to be set. Further, if necessary, the direction of feed movement of the tool rest 38 along the slider guide rail 34 is inclined by a predetermined amount with respect to the rotation axis of the roller 22, but usually the slider guide is inclined with respect to the rotation axis of the receiving roller 22. The feed movement direction of the tool rest 38 along the rail 34 is set in parallel.
[0053]
A magnet roller is housed in the processing device in such an initial setting state, a pair of mandrel portions 16 are attached, and both side edges of the developing sleeve 14 whose outer peripheral surfaces have been processed are placed on the receiving rollers 22. Place.
[0054]
Next, the pair of start switches 72 are operated to drive the position switching cylinder 26 and the lifting / lowering plate driving cylinder 53 to move the pressing roller 25 and the pressing roller 59 to the processing positions, respectively, and further drive the screw shaft driving motor 43. At the same time, the developing sleeve 14 is rotated together with the receiving roller 22 via the pressing roller 59, and at the same time, the roller driving motor 64 is driven to feed and move the turning bit 17 along the outer peripheral surface of the core 16.
[0055]
FIG. 10 schematically shows a state of turning the outer peripheral surface of the mandrel 16 in the present embodiment. That is, the outer peripheral surface of the developing sleeve 14 is sandwiched between the pair of receiving rollers 22 and the pressing roller 59, and is rotated together with the receiving roller 22 by the driving rotational force from the pressing roller 59. The turning tool 17 hits against the outer peripheral surface of the mandrel portion 16, and turns the outer peripheral surface of the mandrel portion 16 concentrically with the outer peripheral surface of the developing sleeve 14 with the feeding movement. In this case, it is desirable to set the position of the turning tool 17 so that the cutting direction of the turning tool 17 is in the radial direction of the core portion 16 passing through the rotation axis of the developing sleeve 14.
[0056]
Next, the result of actually processing the mandrel 16 using such a processing apparatus will be described. A developing sleeve 14 made of an aluminum alloy having a diameter of 20.12 mm and a length of 350 mm was prepared. Each of the pair of mandrel portions 16 of the developing sleeve 14 has a diameter of 8.08 mm and a length of 40 mm. On the other hand, the interval between the receiving rollers 22 is set to 340 mm, and the rotation speed of the roller driving motor 64 is set to 1500 min. ^-1 The rotation speed of the pressing roller 59, that is, the rotation speed of the developing sleeve 14 is increased by about 3000 min. ^-1 Set to. The turning tool 17 was provided with the following commercially available cemented carbide indexable insert (Sumitomo Electric Industries, Ltd .; nose radius 0.8 mm).
Blade tip: ISO model number TCMT110208N-FP
Shank: ISO model number STGC R / L1212-11
The cutting conditions are as follows, and processing is performed by a dry cut method that does not use a processing liquid so as not to contaminate the outer peripheral surface of the developing sleeve 14, and chips are removed through a dust collection duct connected to a dust collector (not shown). It was removed by suction from the processing area.
Cut amount: 0.04 mm (radius removal amount)
Feed speed: 10 mm / s (= 0.2 mm / rev)
When the tip of the turning tool 17 reached the base end of the mandrel 16, the rotation of the screw shaft drive motor 43 was stopped, and the feed of the tool rest 38 was stopped. The surface roughness of the outer peripheral surface of the mandrel 16 at this time was about 0.8 μm in center line average roughness Ra. In order to improve the surface roughness of the outer peripheral surface of the mandrel 16, the screw shaft drive motor 43 is rotated in the reverse direction without changing the cutting depth of the turning bit 17 from this state, and the feed speed is ２ of the forward stroke, that is, As a result of moving the tool rest 38 toward the tip of the mandrel 16 at 5 mm / s (= 0.1 mm / rev) and subjecting the outer peripheral surface of the mandrel 16 to secondary processing, the center line average roughness Ra was reduced to 0. It was possible to finish to about 0.5 μm.
[0057]
In this way, the turning of the outer peripheral surface of the mandrel 16 could be performed in about 23 seconds per cycle. The amount of run-out of the outer peripheral surface of the mandrel 16 with respect to the outer peripheral surface of the developing sleeve 14 was 2 μm or less. Further, the outer diameters of the distal end portion and the proximal end portion of the core portion 16 are 8.006 mm and 7.998 mm, respectively, and are tapered. It was predicted that bending had occurred.
[0058]
Therefore, the amount of screwing of the adjusting screw 48 was adjusted to incline the feed movement direction of the tool rest 38 along the slider guide rail 34 by about 1/40000 with respect to the rotation axis of the receiving roller 22, and the same processing was performed again. As a result, the diameter of the distal end portion and the proximal end portion of the mandrel 16 could be corrected to 8.000 mm and 8.002 mm, respectively.
[0059]
In the above-described embodiment, the outer peripheral surface of the mandrel part 16 is processed by turning. However, the mandrel part 16 is formed of a material having a higher hardness than the above-described aluminum alloy, for example, carbon steel or stainless steel. If the turning is performed under the same conditions as the aluminum alloy, the cutting force is several times larger than that of the aluminum alloy, so that it is possible to obtain good processing accuracy and surface roughness on the outer peripheral surface of the mandrel 16. Becomes difficult. In order to reduce the cutting force, it is conceivable to reduce the feed speed, reduce the depth of cut, or rotate the developing sleeve 14 at a higher speed. However, if the feed speed is reduced or the depth of cut is set to be shallow, the time required for one cycle of processing becomes longer, and there is a limit to the high rotation of the developing sleeve 14, and any of these methods is effective. I can not say. For this reason, it is effective to use a rotating tool such as an end mill or a grinding wheel to prevent a reduction in the processing speed.
[0060]
FIG. 11 shows an enlarged portion of the tool holder 18 of the processing apparatus according to the present invention, and FIG. 12 schematically shows the processing state of the processing apparatus. Will be denoted by the same reference numerals, and duplicate description will be omitted. That is, the tool rest 38 in this embodiment is slidably supported on the slide table 36 in a direction perpendicular to the feed screw shaft 40 by using a micrometer screw 74. A tool drive motor 76 having a main axis 75 of rotation axis parallel to the 40 rotation axes is mounted. An end mill 77 for milling the outer peripheral surface of the mandrel 16 is mounted on the main shaft 75 of the tool drive motor 76. A suction port 79 of a dust collection duct 78 communicating with a dust collector (not shown) is attached to the tool post 38, and chips are collected and removed from the suction port 79 to the dust collector via the dust collection duct 78. I have.
[0061]
In this embodiment, the end mill 77 and the mandrel 16 are in line contact with each other on their outer peripheral surfaces, and the end mill 77 itself is driven and rotated by the tool driving motor 76, so that the machining speed does not decrease. In addition, the outer peripheral surface of the mandrel 16 can be quickly and accurately processed. For example, in the case of the developing sleeve 14 in which the mandrel 16 having the same dimensions and shape as in the above-described embodiment is formed of SUS304, a four-blade carbide end mill 77 having an outer diameter of 10 mm and a tool driving motor 30,000 min for 76 spindles ^-1 , And a feed speed of 10 mm / s in the forward stroke and 5 mm / s in the return stroke is given to the tool post 38, and processing is performed so that the cutting amount becomes 0.04 mm in the forward stroke. The runout of the mandrel 16 could be finished to 2 μm or less, and the center line average roughness Ra of the outer peripheral surface could be 0.8 μm with reference to the outer peripheral surface.
[0062]
If the mandrel 16 is hardened, cutting becomes difficult, so it is effective to use a cylindrical grindstone with a shaft instead of the end mill 77 described above. For example, for example, when the mandrel part 16 having the same size and shape as the above-described embodiment is hardened steel (Vickers hardness: Hv600), the grindstone (WA # 80 having a particle diameter of No. 80 having an outer diameter of 10 mm) is used. (White alundum) and set the spindle of the tool drive motor 76 to 20,000 min. ^-1 , And a feed speed of 10 mm / s in the forward stroke and 5 mm / s in the return stroke is given to the tool post 38, and processing is performed so that the cut amount becomes 0.02 mm in the forward stroke. The run-out of the mandrel part 16 could be finished to 2 μm or less and the center line average roughness Ra of the outer peripheral face to 0.6 μm based on the outer peripheral surface.
[0063]
Even when these end mills 77 and grinding wheels are used, the feed speed of the tool post 38 is the same as in the first embodiment using the turning tool 17, so that the turning of the outer peripheral surface of the mandrel 16 is performed per cycle. This can be done in about 23 seconds.
[0064]
【The invention's effect】
According to the shaft member processing method of the present invention, the large diameter portion processed to a predetermined roundness is rolled, and in this state, the outer peripheral surface of the small diameter portion is processed concentrically with the large diameter portion. For example, after joining a small diameter portion to the side end surface portion of the large diameter portion by incorporating another member into the large diameter portion processed into a cylindrical shape, or after performing a surface treatment on the outer peripheral surface of the large diameter portion, The outer peripheral surface of the small diameter portion can be finished concentrically with the outer peripheral surface of the large diameter portion, and the processing cost can be reduced.
[0065]
When a plurality of rollers are pressed against the outer peripheral surface of the large-diameter portion to pinch the large-diameter portion and at least one of the plurality of rollers is driven in this state, the large-diameter portion is rolled. The outer peripheral surface of the small diameter portion can be machined with the concentricity according to the roundness while minimizing damage to the outer peripheral surface of the portion.
[0066]
According to the shaft member processing method of the present invention, a plurality of rollers are pressed against the outer peripheral surface of the large-diameter portion processed to have a predetermined roundness to clamp the large-diameter portion, and at least one roller is driven to drive the large-diameter portion. The tool is pressed against the outer peripheral surface of the small-diameter portion while feeding the tool along the axis of rotation of the large-diameter portion. Because it was made to work concentrically with, for example, other members are incorporated into the large-diameter portion processed into a cylindrical shape, and the small-diameter portion is joined to the side end surface portion of the large-diameter portion, or the large-diameter portion is After the outer peripheral surface is subjected to the surface treatment, the outer peripheral surface of the small diameter portion can be finished concentrically with the outer peripheral surface of the large diameter portion, and the processing cost can be reduced. In addition, the outer peripheral surface of the small diameter portion can be machined with the concentricity corresponding to the roundness while minimizing damage to the outer peripheral surface of the large diameter portion.
[0067]
According to the shaft member processing method of the present invention, a plurality of rollers are pressed against the outer peripheral surface of the large-diameter portion processed to have a predetermined roundness to clamp the large-diameter portion, and at least one roller is driven to drive the large-diameter portion. The tool is pressed against the outer peripheral surface of the small-diameter portion while feeding the tool along the axis of rotation of the large-diameter portion. When machining concentrically with the tool, the feed direction of the tool is inclined with respect to the rotation axis of the large diameter part, and the distance from the rotation axis of the large diameter part to the machining point of the tool is closer to the tip end than the base end of the small diameter part. Is set short, it is possible to correct a cutting error caused by the bending of the small diameter portion caused by the cutting of the tool, and to process the small diameter portion with high accuracy.
[0068]
When a pair of press rollers that can contact both end surfaces of the large-diameter portion are opposed to both end surfaces of the large-diameter portion in close proximity, the escape of the shaft member due to the feed movement of the tool is prevented and the small-diameter portion is reliably processed. can do.
[0069]
A plurality of rollers have at least two sets of rollers spaced apart along these rotation axes, and when these two sets of rollers abut both side edges of the large-diameter portion, these rollers are used. Damage to the outer peripheral surface of the large diameter portion due to contact of the group can be suppressed to a minimum.
[0070]
According to the shaft member processing apparatus of the present invention, two sets are arranged at a distance from each other, and a pair of receiving rollers and a pair of receiving rollers each contact and support the outer peripheral surface of the large diameter portion. Two pressing rollers that are arranged to face each other and can pinch the large-diameter portion with the two sets of receiving rollers, and roller moving means that reciprocates the two pressing rollers in a direction facing the receiving rollers; A roller rotation driving means for driving and rotating at least one of the two pressing rollers, a tool holder on which a tool for processing the outer peripheral surface of the small diameter portion is mounted, and a processing depth of the tool with respect to the outer peripheral surface of the small diameter portion is adjusted. And a feed drive means for feeding the tool mounted on the tool holder along the rotation axis of the large-diameter portion, so that, for example, a large-diameter portion processed into a cylindrical shape is provided. Assemble other components inside After joining the small diameter portion to the side end surface of the large diameter portion or performing surface treatment on the outer peripheral surface of the large diameter portion, finish the outer peripheral surface of the small diameter portion concentrically with the outer peripheral surface of the large diameter portion And the processing cost can be reduced. In addition, the outer peripheral surface of the small diameter portion can be machined with the concentricity corresponding to the roundness while minimizing damage to the outer peripheral surface of the large diameter portion.
[0071]
When a pair of pressing rollers that can contact both end surfaces of the large-diameter portion are further provided, the small-diameter portion can be reliably processed by preventing the shaft member from escaping due to the feed movement of the tool. In particular, when the relative position between one pressing roller and one set of receiving rollers is kept constant, and the relative position of the other pressing roller with respect to the other set of receiving rollers can be changed between the processing position and the retracted position. In addition, the positioning of the shaft member with respect to the receiving roller and the workability of attachment and detachment can be improved.
[0072]
If one set of receiving rollers and one corresponding pressing roller can be moved in a direction parallel to these rotation axes according to the length of the large-diameter portion, they are moved to the length of the large-diameter portion of the shaft member. Can be changed to the optimum holding position.
[0073]
When two sets of receiving rollers and two pressing rollers can sandwich both side edges of the large-diameter portion, damage to the outer peripheral surface of the large-diameter portion due to contact of these rollers can be minimized.
[0074]
The shaft member has two small-diameter portions projecting in opposite directions from both end surfaces of the large-diameter portion, and two tool holders, two machining-depth adjusting means, and two feed driving means are provided corresponding to the two small-diameter parts. In the case where the feed movement directions of the two tool holders by the two feed drive units are opposite to each other, the escape of the shaft member due to the feed movement of the tool can be eliminated, and the pressing roller for that can be omitted.
[0075]
When the tool is a turning tool, high-precision concentricity and surface roughness can be obtained by forming the small-diameter portion from a soft free-cutting material such as an aluminum alloy or a copper alloy such as brass.
[0076]
When the tool is an end mill having a rotation axis extending along the rotation axis of the small-diameter portion and further provided with a tool driving motor mounted on a tool holder and driving and rotating the end mill, cutting is performed more than when using a turning tool. Processing time can be reduced. Similarly, when the tool is a grinding wheel having a rotation axis extending along the rotation axis of the small-diameter portion, and the tool further includes a tool drive motor mounted on a tool holder to drive and rotate the grinding wheel, the small-diameter portion is It is made of a high hardness material such as hardened steel or ceramics, and is effective when cutting is difficult.
[0077]
When the feed movement direction of the tool holder is inclined with respect to the rotation axis of the small diameter part, and the distance from the rotation axis of the large diameter part to the machining point of the tool is set shorter toward the distal end with respect to the base end of the small diameter part, the tool It is possible to correct a cutting error caused by bending of the small-diameter portion that occurs with the cutting.
[Brief description of the drawings]
FIG. 1 is a front view showing the appearance of an embodiment in which a shaft member processing apparatus according to the present invention is applied to an electrophotographic photosensitive drum, and a part of the apparatus is shown in a broken state.
FIG. 2 is a left side view of the embodiment shown in FIG.
FIG. 3 is a plan view of the embodiment shown in FIG. 1 with a part thereof broken.
FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 2, showing a part in a broken state.
FIG. 5 is a right side view of FIG.
FIG. 6 is a sectional view taken along the line VI-VI in FIG. 4;
FIG. 7 is an extracted enlarged sectional view of a part of a tool holder in the embodiment shown in FIG. 1;
FIG. 8 is a plan view corresponding to FIG. 7;
9 is a sectional view taken along the line IX-IX in FIG. 7;
FIG. 10 is a conceptual work diagram showing a state during processing in the embodiment shown in FIG. 1;
FIG. 11 is a plan view of a tool holder in a shaft member processing apparatus according to another embodiment of the present invention.
FIG. 12 is an enlarged sectional view taken along the arrow XII-XII in FIG. 11;
FIG. 13 is a conceptual diagram illustrating a schematic structure of an electrophotographic apparatus to which the present invention is applied.
[Explanation of symbols]
11 Pedestal
12 floor
13 Base plate
14 Developing sleeve
15 Work Stand
16 Core part
17 Turning tool
18L, 18R Tool holder
19 Stand base
20L, 20R Roller holder
21 Rotation axis
22L, 22R Receiving roller
23L, 23R Bracket
24 rotating shaft
25L, 25R Holding roller
26 Position switching cylinder
27 Holder guide rail
28 Clamping device
29L, 29R Base block
30 slider
31 Block guide rail
32 Clamping device
33 frame
34 Slider guide rail
35 Slider
36 slide table
37 volts
38 Tool post
39 end plate
40 feed screw shaft
41 Bracket
42 Fitting
43 Screw shaft drive motor
44 Feed nut
45 pivot pin
46 long hole
47 Adjusting pin
48 Adjustment screw
49 posts
50 Top plate
51 Sliding bush
52 lifting plate
53 Lifting plate drive cylinder
54 piston rod
55 bracket
56 Stopper rod
57 head
58 Stopper ring
59L, 59R Press roller
60 shaft support bracket
61 Roller drive shaft
62 Press roller shaft
63 Fitting
64 roller drive motor
65 Bracket
66 pulley
67 Endless belt
68 idle pulley
69 Set screw
70 elastic body
71 Switch plate
72 Start switch
73 Emergency stop switch
74 micrometer screw
75 spindle
76 Tool drive motor
77 end mill
78 Dust collection duct
79 Suction port

Claims (16)

A method of processing a shaft member having a large diameter portion and a small diameter portion protruding from at least one end surface of the large diameter portion,
Rolling the large-diameter portion processed to a predetermined roundness;
Machining the outer peripheral surface of the small diameter portion concentrically with the large diameter portion while the large diameter portion is rolling. The step of rolling the large-diameter portion includes pressing a plurality of rollers against the outer peripheral surface of the large-diameter portion to pinch the same, and driving at least one of the plurality of rollers in this state. The method for processing a shaft member according to claim 1, wherein the method is performed. A method of processing a shaft member having a large diameter portion and a small diameter portion protruding from at least one end surface of the large diameter portion,
Pressing a plurality of rollers against the outer peripheral surface of the large-diameter portion processed to a predetermined roundness to clamp the large-diameter portion,
Driving at least one of the plurality of rollers to rotate the large-diameter portion while being sandwiched by the plurality of rollers;
Pressing the tool against the outer peripheral surface of the small diameter portion, feeding the tool along the rotation axis of the large diameter portion, and processing the outer peripheral surface of the small diameter portion concentrically with the large diameter portion. A method for processing a shaft member. A method of processing a shaft member having a large diameter portion and a small diameter portion protruding from at least one end surface of the large diameter portion,
Pressing a plurality of rollers against the outer peripheral surface of the large-diameter portion processed to a predetermined roundness to clamp the large-diameter portion,
Driving at least one of the plurality of rollers to rotate the large-diameter portion while being sandwiched by the plurality of rollers;
Pressing the tool against the outer peripheral surface of the small diameter portion, feeding the tool along the rotation axis of the large diameter portion, and processing the outer peripheral surface of the small diameter portion concentrically with the large diameter portion. The feed direction of the tool is inclined with respect to the rotation axis of the large-diameter portion, and the distance from the rotation axis of the large-diameter portion to the processing point of the tool is shorter toward the distal end with respect to the base end of the small-diameter portion. A method for processing a shaft member, wherein the method is set. The method according to any one of claims 2 to 4, further comprising a step of causing a pair of pressing rollers capable of contacting both end surfaces of the large diameter portion to face both end surfaces of the large diameter portion in close proximity. The processing method of the shaft member described in the above. The plurality of rollers have at least two sets of rollers spaced apart along the rotation axis thereof, and the two sets of rollers abut both side edges of the large diameter portion. The method for processing a shaft member according to any one of claims 2 to 5, wherein: An apparatus for processing an outer peripheral surface of the small-diameter portion of a shaft member having a large-diameter portion and a small-diameter portion protruding from at least one end surface of the large-diameter portion concentrically with the large-diameter portion,
A pair of receiving rollers arranged in a pair and spaced from each other to abut against and support the outer peripheral surface of the large diameter portion;
Two pressing rollers that are arranged to face the two sets of receiving rollers, respectively, and that can pinch the large diameter portion with the two sets of the receiving rollers;
Roller moving means for reciprocating these two pressing rollers along a direction facing the receiving roller;
Roller rotation driving means for driving and rotating at least one of the two pressing rollers;
A tool holder on which a tool for processing the outer peripheral surface of the small diameter portion is mounted;
Machining depth adjustment means for adjusting the machining depth by the tool with respect to the outer peripheral surface of the small diameter portion,
And a feed driving means for feeding a tool mounted on the tool holder along a rotation axis of the large-diameter portion. 8. The shaft member processing apparatus according to claim 7, further comprising a pair of pressing rollers capable of contacting both end surfaces of the large diameter portion. One of the pressing rollers has a fixed relative position with respect to one of the receiving rollers, and the other pressing roller has a relative position with respect to the other of the receiving rollers that can be changed between a processing position and a retracted position. The apparatus for processing a shaft member according to claim 8, wherein: 8. The one set of receiving rollers and the corresponding one of the pressing rollers are movable in a direction parallel to the rotation axis thereof according to the length of the large diameter portion. The shaft member processing apparatus according to any one of claims 1 to 9. The shaft member processing apparatus according to any one of claims 7 to 10, wherein the two sets of receiving rollers and the two pressing rollers can sandwich both side edges of the large-diameter portion. . The shaft member has two small diameter portions projecting in opposite directions from both end surfaces of the large diameter portion, and the tool holder, the machining depth adjusting means, and the feed driving means correspond to these two small diameter parts. 12. The shaft member processing apparatus according to claim 7, wherein two tool holders are provided, and the feed movement directions of the two tool holders by the two feed drive units are opposite to each other. . 13. The shaft member processing apparatus according to claim 7, wherein the tool is a turning tool. The tool is an end mill or a grinding wheel having a rotation axis extending along the rotation axis of the small diameter portion, and further includes a tool driving motor mounted on the tool holder to drive and rotate the end mill or the grinding wheel. The apparatus for processing a shaft member according to any one of claims 7 to 12, wherein: The shaft member processing apparatus according to claim 14, wherein a rotation axis of the end mill or the grinding wheel is set in parallel with a feed movement direction of the tool holder. The feed movement direction of the tool holder is inclined with respect to the rotation axis of the small-diameter portion, and the distance from the rotation axis of the large-diameter portion to the processing point of the tool is shorter toward the distal end with respect to the base end of the small-diameter portion. The shaft member processing apparatus according to any one of claims 7 to 15, wherein the apparatus is set.

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