JP2000246631A - Narrow long material supporting device for polishing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To drive a pinching member at the same speed with a spindle by connecting a space between the spindle and the pinching member for pinching one end of a material to be ground, which is supported by plural pairs of support bases for supporting an outer diameter part of the material to be ground at one end and the other end thereof freely to be rotated, with a means capable of floating and moving in the radial direction. SOLUTION: A material W to be ground by a cylindrical grinder 10 is supported at the outer surface of both ends thereof by a pair of support bases 20 freely to be rotated. One end of the material W to be ground is pinched by a pinching member 30, and the pinching member 30 is connected to a spindle 12 through a connecting means 15, and the material W to be ground is rotated by the spindle 12. Furthermore, the pinching member 30 has a pair of steel main bodies to be moved forward and backward in a direction crossing the axis CL of the spindle so as to pinch the outer diameter part of a core (a) as a part of the material w to be ground. With this structure, generation of distorsion of the material to be ground at the time of fitting and cutting can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support device for attaching an elongated material, such as a paper feed roll of a printer or a copying machine, provided with a large-diameter roller requiring grinding around an elongated core shaft to a grinding machine. Things.

[0002]

2. Description of the Related Art Conventionally, like a paper feed roll of a printer or a copier shown in FIG. 6 (a), an elongated core shaft a obtained by cutting a wire material having a smooth surface is fitted on the same. When grinding the large diameter guide roller b as a work material W, the core shaft a is sandwiched between a center C provided on a main shaft and a center c provided on a tailstock, and rotated by the main shaft. That is, the grinding wheel G is moved forward and backward toward the work material W to perform the so-called traverse cut. Generally, the work material W
It is required that the center hole provided in the work material W be strongly pressed by the tailstock to accurately center the center when the center is supported between the centers C and c. Then, when a strong pressing force acts on the thin core shaft a from the center c on the tailstock side, as shown by a two-dot chain line in the figure, the central portion in the longitudinal direction is bent in a direction deviating from the axis.

[0003]

Conventionally, this state of distortion is ignored, and the center is sandwiched between the two centers C and c. Therefore, the bending force is further increased by the grinding force given by the cutting of the grindstone G, and the grinding is performed. When the center c is retreated and the work material W is removed after the completion of the above, the bent core axis a returns to its original state, and the axis of the guide roller b oscillates with respect to the axis of the core axis a (concentricity). (Not good condition) On the other hand, a centerless grinding method is conventionally known as a technique for grinding a workpiece W without applying an axial pressing force. However, the guide roller b is formed by the centerless grinding method.
Grinding the outer diameter of the core wire a, the surface of which has already been smoothed by wire drawing, and the processing standard of the outer diameter of the guide roller b to be centerlessly ground are different. The concentricity decreased. However, in recent years,
With higher precision of products, higher precision than before has been required, and a new processing method or processing apparatus has been required.

[0004]

The above object is achieved by providing a pair of two support bases that rotatably support an outer diameter portion of a work material at one end and the other end in the axial direction of a spindle. The problem can be solved by connecting a holding member for holding one end of a work material supported by the support bases and the main shaft by a connecting means floating in a radial direction. Therein, the holding member has two main bodies which are opposed to each other in a direction perpendicular to the main axis with the main body axis interposed therebetween, and the connecting means is eccentric to one side from the main shaft axis. It is preferable that the eccentric hole is formed of a main body and two eccentric shafts projecting from the main shaft in the axial direction and loosely fitted into the eccentric holes. Further, the holding member has a main body slidably supported on a plurality of guide pins having an axis perpendicular to the axis of the main shaft, and the main body is provided by a spring having one end supported by the guide pin. It is preferable that the pressing members be pressed from the back and urged in the approaching direction. Further, the main shaft is provided with a tapered conical release cam positioned on the axis so as to be able to advance and retreat, and the release cam releases the work material from the holding member against the elasticity of the spring at the advance position. Configuration.

[0005]

The work material is held on the axis of the main shaft by the outer diameter portions at both ends supported by a pair of support tables, and is rotated by the holding member. The holding member and the main shaft are connected by the connecting means without being restricted in the radial direction. Therefore, even if the holding member is not on the same rotation axis as the main shaft, it is driven at the same speed. [Claim 2] The two main bodies constituting the holding member hold the work material therebetween and are driven in the rotation direction. The connecting means is configured by loosely fitting an eccentric hole provided in the main body and an eccentric shaft protruding from the main shaft, and rotating the holding member and the main shaft by utilizing a gap therebetween. Even if the center is not coaxial, the holding member is driven at the same speed as the main shaft as the main shaft rotates. [Claim 3] The two main bodies constituting the holding member are pressed by the spring on the back surface and advance toward the work material from both sides, and are pressed and frictionally engaged without moving the axis of the work material. . The frictional engagement is released when the main body, which is pressed by the spring and advances toward the work material, is retracted against the spring by a release cam which advances in the axial direction.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. In FIG. 1, reference numeral 10 denotes a cylindrical grinding machine utilizing the present invention. On a bed 11 of the cylindrical grinding machine, a spindle 12 for rotating and driving a work material W and a grindstone G which advances and retreats toward the work material W are supported. I have. Reference numeral 14 denotes a control panel of a numerical control system for instructing a finish dimension. The above configuration is not much different from the configuration of a conventionally known cylindrical grinding machine.

The workpiece W processed by the cylindrical grinder 10 is the above-mentioned paper feed roll, and is shown in FIG.
As shown in (b), two support bases 20, 2
The outer surfaces at both ends are rotatably supported by 0. One end of the work material W is gripped by the holding member 30, and the holding member 30 is
It is connected to. Therefore, the workpiece W is driven to rotate by the main shaft 12.

As shown in FIG. 3 (a), the support tables 20, 20 support a lower support 21 for supporting the lower surface of a core shaft a, which is a work material W, and press the upper surface of the core shaft a downward. And a lower push arm 22 that presses and pushes the lower pusher 21 to suppress floating from above the lower receiving stand 21. Reference numeral 23 denotes a slider, which is slidably supported on the bed 11 in parallel with the axis CL of the main shaft 12, and supports the support tables 20, 20 thereon.

The lower support 21 constituting the support 20 has a columnar shape extending in the vertical direction, and is bolted on the slider 23 at a horizontal portion provided at the lower end thereof. At the upper end of the lower support 21, as shown in FIG. 3B, a pair of support rollers 21 a, 21 a arranged substantially symmetrically in the front-rear direction with respect to the axis CL of the main shaft is provided with pins 2.
It is rotatably supported by 1b and 21b. In addition, two support rollers 21a are mounted side by side on the pins 21b, and a relatively large area is taken into consideration so as not to hit one side.

The lower push arm 22 is connected to the air cylinder 2.
No. 4 piston rod 24b, which extends in the horizontal direction from the piston rod 24b, and its tip end 22d reaches just above the lower support 21. A lower support 2 is provided on the lower surface of the tip 22d.
A holding roller 22a vertically symmetrically disposed with respect to the supporting roller 21a provided at 1 is rotatably supported by a pin 22b. The air cylinder 24 is bolted to an upright plate 25 bolted to the slider 23.
24a is a piston of the air cylinder 24, 24b is a piston rod, and two parallel guide bars 24c are arranged in parallel with the piston rod 24b so that the lifting and lowering operation can be performed smoothly.

Thus, the supply of the work material W to the support table 20 is not shown while the lower push arm 22 is retracted to the upper position shown in FIG. 3A by the action of the air cylinder 24. This is done by an autoloader. Lower support 2
When the work material W is supplied to the workpiece 1, the lower push arm 22 advances to the lower position shown in FIG. And fix it rotatably and so as not to float.

As shown in FIG. 4, the holding member 30 has two members which move in a direction perpendicular to the axis CL of the main shaft in order to hold the outer diameter portion of the core shaft a which is a part of the workpiece W. It has a pair of steel main bodies 31, 31. The main bodies 31 have an axis in a direction orthogonal to the axis CL of the main axis, and the axis C
Two guide pins 32 arranged symmetrically with respect to L,
32 is slidably supported on the guide pin 32 and is biased in a direction approaching each other by a back spring 33 supported by a hexagonal head of the guide pin 32 or a nut screwed to the guide pin 32. ing.

As shown in FIG. 5, two main bodies 31
The swing arm 35 is rotatably supported facing the opposing surface. Reference numeral 34 denotes a pivot for pivotally supporting the swing arm 35 on the main body 31. On the swing arm 35, two holding claws 36, 36 made of a hard metal are arranged symmetrically in the left-right direction in the direction of the axis CL of the main shaft, and are detachably attached by bolts 37.

Reference numeral 15b denotes an eccentric hole which forms a main part of the connecting means 15. The eccentric hole 15b is provided to be deviated to one side with respect to the axis CL of the main shaft, and has a substantially inverted trapezoidal shape. A round bar-shaped eccentric shaft 15a protruding from the main shaft 12 is loosely inserted into the eccentric hole 15b with a large gap, and is prevented from coming off by a stopper plate 15c screwed to the tip end thereof. Thus, the main body 31 is not restrained on the position of the axis CL of the main shaft on the eccentric shaft 15a, that is,
It is floatingly supported through some play in the circumferential direction,
When the main shaft 12 rotates, the rotation is transmitted to the main body 31 via the eccentric shaft 15a, and the main body 31 does not rotate around the axis CL of the main shaft but around the axis of the workpiece W at the same speed as the rotation of the main shaft 12. Rotate. In this embodiment, the main body 31 has play not only in the circumferential direction but also in the axial direction, thereby facilitating the supply and recovery of the work material by the autoloader.

On the other hand, a guide piece 42 having a tapered guide hole 41 is fixed to the back surface of the main body 31 with a bolt 43, and a substantially conical release cam 40 corresponding to the guide piece 42 is moved from the main shaft 12. It is provided so as to freely advance and retreat. When the release cam 40 advances into the guide hole 41, the main body 31 is prevented from further retreating after contacting the stopper plate 15c, so that the spring 33 follows the inclination of the inner surface of the guide hole 41. Then, the work material W is released by retreating in the radial direction while opening the holding claws 36. Therefore, the supply and recovery of the work material W to and from the support base 20 are performed in a state where the release cam 40 is protruded and the interval between the two main bodies 31 is widened, and the grinding of the work material W causes the release cam 40 to retreat. This is performed in a state where the work material W is pressed and gripped by the spring 33 between the two main bodies 31.

As described above, according to the above embodiment, when the lower push arm 22 descends, the outer diameters of the both ends of the work material W are pinched by the support roller 21a and the holding roller 22a, and the lower support 21 It is supported so that it does not rise from above. In this state, the workpiece W is gripped at one end by the holding member 30 and driven in the rotation direction. Nipping member 30
The connecting member 15 for connecting the main shaft 12 to the main shaft 12 rotates the main shaft 12 because the eccentric shaft 15a provided on the main shaft 12 and the eccentric hole 15b provided on the main body 31 are fitted with a large gap. The main body 31 can rotate on different axes at the same speed. As a result, the workpiece W is attached to the cylindrical grinder 10 without receiving a compressive force in the axial direction. When the work material W is driven by the spindle 12,
Even if the eccentric shaft 15a and the eccentric hole 15b are fitted with a large gap even if the eccentric shaft 15a and the eccentric hole 15b are slightly moved in the axial direction due to the skew, the movement can be absorbed by the movement of the holding member 30 in the axial direction. Therefore, it is easy to grind a material that is elongated and easily bent.

[0017]

According to the first aspect, the work material is supported on the outer surface by the support table, is rotatably supported without receiving the axial pressure, and is flexibly connected to the main shaft by the connecting means. Therefore, it is possible to reduce the distortion of the work material generated at the time of mounting or cutting, and it is possible to easily perform high-precision processing. According to the second aspect, the main shaft is securely held by the holding means even if there is a slight deviation in the axial center position, and the connecting means engages with the eccentric shaft provided on the main shaft and the eccentric hole provided on the holding member. Therefore, even if the axes of the main shaft and the work material are slightly eccentric, the drive can be performed without any trouble by a simple configuration. According to the third aspect, the holding member presses the main body slidably supported on the guide pin against the outer diameter of the work material by the spring on the back surface, so that the axis of the main shaft and the work material is formed. Even if the position is slightly shifted, the outer diameter of the work material can be surely grasped. Can be Further, with a simple structure in which the release cam advances and retreats on the axis of the main shaft, the holding of the work material by the holding member can be released. And so on.

[Brief description of the drawings]

FIG. 1 is a front view of a cylindrical grinding machine using the present invention.

FIG. 2 is a front view showing a main part of the present invention taken out from FIG.

FIG. 3 is a view taken in the direction of the arrow in FIG. 2, wherein (a) shows a released state of the material to be ground, and (b) shows a pressed state.

FIG. 4 is an arrow IV view in FIG. 2;

FIG. 5 is a sectional view taken along line VV in FIG. 4;

6 is a view taken along the arrow VI showing a main part in FIG. 2, and FIG.
Shows a configuration according to a conventional processing method, and (b) shows a configuration according to the processing method of the present invention.

[Explanation of symbols]

 10 ··· Cylindrical grinding machine 11 ··· Bed 12 ··· Main shaft 14 ··· Control panel 15 ··· Connection means 15a ··· Eccentric shaft 15b ··· Eccentric hole 15c ··· Stopper plate 20 Support base 21 Lower support 21a Support roller 21b Pin 22 Lower arm 22a Holding roller 22b Pin 22d Tip 23, slider 24, air cylinder 24 a, piston 24 b, piston rod 24 c, guide bar 25, upright plate 30, clamping member 31, · Main body 32 ··· Guide pin 33 ··· Spring 34 ··· Pivot 35 ··· Swinging arm 36 ··· Nipping claw 37 ··· Bolt 40 ··· Release cam 41 .... Guide holes 42 ... Guide pieces 3 Bolt a Core shaft b Guide roller C Center provided on main shaft CL Main shaft axis G Grindstone c tailstock Center provided on table W: Work material

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Katsuhiko Saito 105 Nagamori, Toyotamachi, Iwata-gun, Shizuoka Prefecture Techno Giken Co., Ltd. F-term (reference) 3C034 AA01 AA13 BB72 DD20

Claims (3)

[Claims] A pair of support bases for rotatably supporting the outer diameter portion of the work material at one end and the other end in the axial direction of the spindle, and a work piece supported by the support bases; An apparatus for supporting an elongated material in a grinding machine, wherein a holding member for holding one end of a cutting material and the main shaft are connected by a floating connecting means in a radial direction. 2. The holding member according to claim 1, wherein the holding member has two main bodies which are opposed to each other with the axis of the main shaft interposed therebetween and which advances and retreats in a direction perpendicular to the main shaft. Of an elongated material in a grinding machine constituted by an eccentric hole provided in the main body eccentrically from one side and two eccentric shafts projecting from the main shaft in the axial direction and loosely fitted into the eccentric hole. apparatus. 3. The holding member according to claim 2, wherein the holding member has a main body slidably supported on a plurality of guide pins having an axis perpendicular to the axis of the main shaft, and the main body is the guide pin. The spring is pressed from the back by one end and is urged in the approaching direction to each other, and the main shaft is provided with a release cam formed in a tapered conical shape located on the axis and capable of moving back and forth. The release cam is a device for supporting the elongated material in the grinding machine that releases the work material from the holding member against the elasticity of the spring at the advanced position.