JPH10202488A - Workpiece feed device for centerless grinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve grinding efficiency by feeding and discharging a workpiece to and from a workpiece machining position in a single process, and provide a work feed device having a simple structure and a small size, regarding an in-feed type centerless grinder. SOLUTION: This workpiece feed device has a rotatable carrier disc with a plurality of workpiece holding parts 11 arranged along the periphery at the prescribed pitches for holding workpieces W, and an indexing device 3 for indexing and rotating the carrier disc. The indexing device 3 is formed so that the carrier disc 2 is intermittently indexed and rotated at such indexing pitches as corresponding to the arrangement pitches of the work holding parts 11, and the discharge of machined workpieces W and the feed of workpieces W retained on the succeeding workpiece holding parts 11 are performed in a continuous single process through the indexing operation of the carrier disc 2 at a workpiece machining position P2 . Also, the workpiece feed device is formed out of the simply structured carrier disc 2 and indexing device 3. As a result, a device structure becomes simple and small. At the same time, the operation of the device becomes simple, involving only the indexed rotation of the carrier disc 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work supply apparatus for a centerless grinding machine, and more particularly, to an infeed type centerless grinding apparatus for grinding a so-called stepped work or a work having a tapered outer surface. The present invention relates to a technology for efficiently supplying and discharging a workpiece to and from a grinding position on a board.

[0002]

2. Description of the Related Art In-feed (feeding) grinding in a centerless grinding machine is a work (hereinafter referred to as a work).
For grinding cylindrical outer diameters of workpieces that cannot be achieved by through (through feed) grinding, such as so-called stepped workpieces having different diameter portions and workpieces having a tapered outer diameter surface whose diameter continuously changes in the axial direction. This is a suitable grinding method.

In this infeed grinding, FIG.
As shown in (a), the work W is supported by an adjusting wheel R and a blade (receiving plate) B having a profile corresponding to the outer diameter surface of the cylinder and is regulated in the axial direction by a stopper S. The cylindrical outer diameter surface of the work W is ground by a grinding wheel G having a profile corresponding to the outer diameter surface of the cylindrical member.

By the way, in infeed grinding,
Since the relative positional relationship between the work W and the grinding wheel G, the adjusting wheel R and the blade B, that is, the positioning in the axial direction is important, the grinding process is performed as shown in FIG. A loading process of supplying and arranging the blade W, which is a workpiece processing position, while performing axial positioning from above, a grinding process of grinding the workpiece W by a grinding wheel G, and a workpiece W after the grinding process is upward from the blade B. The unloading process of taking out and discharging is performed sequentially and continuously, that is, the loading process and the unloading process are performed separately and independently.

[0005] As a work supply apparatus for performing both of these steps, there are a case where two apparatuses for performing each step independently are used and a case where a single apparatus for performing both steps is used. However, in any case, the operation of the apparatus in both of these steps is performed by combining the horizontal and vertical movements with the workpiece chucking operation.

[0006]

However, in such a configuration, the operation of the work supply device must be complicated and performed with high accuracy, so that the configuration of the device is inevitably complicated and large in structure. Furthermore, the grinding machine equipment itself has become complicated and large, and equipment costs and maintenance costs have risen.

In addition to the complicated structure of the work supply device, the work supply device is located close to the work processing position where the grinding wheel G, the adjusting wheel R and the blade B are close to each other. There is a problem in workability in maintenance, such as requiring skill in adjusting the relative arrangement with peripheral devices, making it difficult and time-consuming to change steps in accordance with a change in standard dimensions of a work.

Further, since the loading step and the unloading step are performed in separate steps, the time required for loading and unloading the work W is long, which leads to an increase in the processing cycle time of the in-feed grinding, and particularly, for mass production. In this case, the grinding process had a large effect on the increase in the processing cost.

The present invention has been made in view of such a conventional problem, and an object of the present invention is to supply and discharge a work to and from a work processing position in an in-feed type centerless grinding machine. The object of the present invention is to provide a work supply device having a simple structure and a small size, while improving the efficiency of the grinding operation.

[0010]

In order to achieve the above object, a work supply device according to the present invention is provided such that a plurality of work holding portions which are rotatably supported on a shaft and which hold a work at an outer peripheral edge thereof are arranged in a circumferential direction. A carrier disk provided at a predetermined arrangement pitch, and an index device for rotating the carrier disk by an index, wherein the work holding portion is directed outward from an outer peripheral edge of the carrier disk. And the workpiece has a shape and dimensions for holding the work so that the axis is oriented in the rotation direction of the carrier disk, and the index device has an index pitch corresponding to an arrangement pitch of the work holding unit, and The disc is intermittently rotated by an index, and the work holding unit loads the workpiece by the index rotation of the carrier disc. The work receiving position is indexed to the work loading position and the work processing position for grinding the work, and the rear end side surface of the work holding portion is configured to perform a work discharging operation after the grinding of the work is completed. It is characterized by.

In the present invention, the work carried into the work holding portion of the carrier disk at the work carry-in position is index-supplied to the work processing position by the index device rotating the carrier disk with the index device. While being supported by the adjusting wheel and the blade and regulated in the axial direction by the stopper, the cylindrical outer diameter surface is subjected to grinding by a grinding wheel, and is discharged from the workpiece processing position after the grinding is completed.

In this case, the work holding portion is provided with a shape and dimension that is opened outward from the outer peripheral edge of the carrier disk and holds the work so that the axis is oriented in the rotation direction of the carrier disk. Therefore, when the index is supplied to the work processing position, the work falls directly onto the blade due to its own weight, and then the stopper performs the axial regulating action, that is, the axial positioning action. On the other hand, when the work is discharged from the work processing position, the rear end side surface of the work holding portion presses the rear end surface of the work to perform a discharge operation.

Further, the index device has an index pitch corresponding to an arrangement pitch of the work holding section,
Since the carrier disc is intermittently rotated by the index, at the work processing position, the discharge of the work that has finished grinding and the supply of the work held by the subsequent work holding unit for grinding are performed. This is performed in one continuous process by the indexing operation of the carrier disk.

The main structure of the work supply device of the present invention is composed of a carrier disk having a simple structure and an index device for rotating the carrier disk by an index. Also, only the rotation of the carrier disk by the index is simple.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

A work supply device according to the present invention is shown in FIGS. 1 and 2, and this work supply device 1 is provided in an infeed type centerless grinding machine.

This centerless grinding machine has a general structure that is well known in the art.
An adjustment wheel R for rotatably supporting the outer diameter surface of the work W, and a blade B for supporting the lower side of the outer diameter surface of the work W, and the work supply device 1 between the grinding wheel G and the adjustment wheel R Is arranged. Support surface Ba of blade B
A work stopper (stopper) S for regulating the position of the work W in the axial direction is integrally formed in an upper part in an upright manner.

The work supply device 1 includes a carrier disk 2, an index device 3, a work carry-in device 4, a work carry-out chute 5, and a control device 6 as main parts.

The carrier disk 2 supplies (loads) the work W onto the blade B between the grinding wheel G and the adjustment wheel R.
・ It is designed to discharge (unload) and can be rotated in one direction, that is, in the index rotation direction X.

That is, the carrier disc 2 is a thin disc-shaped disc arranged between the grinding wheel G and the adjusting wheel R. When the support shaft 2a is positioned above the blade B, the carrier wheel 2 The adjusting wheel R is rotatably supported in a state orthogonal to the axis of the rotating main shafts Ga and Ra. Thereby, the carrier disc 2 is moved between the grinding wheel G and the adjustment wheel R.
It is rotatable along a vertical plane parallel to the axes of the grinding wheel G and the adjusting wheel R. A one-way clutch 10 is connected adjacent to a bearing (not shown) for rotatably supporting the carrier disk 2a, so that the carrier disk 2 rotates only in the index rotation direction X.

On the outer peripheral edge of the carrier disk 2, a work W
Are provided at a predetermined arrangement pitch in the circumferential direction.

The work holding part 11 is in the form of a substantially rectangular holding groove which is opened outward from the outer peripheral edge of the carrier disk 2. It is set so as to be held so as to face the rotation direction of the disk 2. That is, the length of the work holding portion 11 is set slightly larger than the length of the work W, and the depth or height is set slightly smaller than the diameter of the work W. The groove bottom 11a of the work holding portion 11 is a flat surface that supports the outer diameter surface of the work W, and has a front end side surface 11b and a rear end side surface 11c.
Are flat surfaces that can abut and engage the front and rear end surfaces of the work W, respectively.

The outer diameter of the carrier disk 2 is as follows:
The work holding part 11 is set so as to pass above and near the support surface Ba of the blade B, and has a thickness smaller than the outer diameter of the work W as shown in FIG. , At least smaller than the final finished outer diameter of the workpiece W.

As shown in FIG. 2, when the carrier disk 2 is rotated by the index, the outermost peripheral edge passes near the upper side without interfering with the blade B and the stopper S, as shown in FIG. Thus, the work holding unit 11 does not interfere with the grinding wheel G and the adjustment wheel R,
The work W is held and transported between them. The front end side surface 11b and the rear end side surface 11b of the work holding portion 11 are also provided.
As described later, c is set so as to be able to abut against and engage with both front and rear end surfaces of the work W placed on the plate B.

In this connection, a guide portion 12 is arranged near the outer periphery of the carrier disk 2. The guide portion 12, as described later, the workpiece W carried held by the work loading position P ₁ to the workpiece holding portion 11 of the carrier disc 2, which alignment guide remains to the work processing position P ₂ of the holding state It is. Although the specific structure of the guide portion 12 is not shown, the guide portion 12
Within the scope of the workpiece processing position P _{2 1,} it is provided in the enclosed type to surround the outer periphery of the carrier disc 2, and to support and guide the outer diameter surface of the workpiece W.

The index device 3 is for rotating the carrier disk 2 by an index, and includes an index mechanism 15 and a kickback mechanism 16.

The indexing mechanism 15 is used for the carrier disk 2
Are intermittently pressed and rotated by the index pitch, and are composed of a plurality of index pins 20, 20,... Provided on one side surface of the carrier disk 2, and an index cylinder 21 as index driving means. The specific structure is shown in FIG.

The index pins 20 are provided on one side surface of the carrier disk 2 at the same pitch as the work holding parts 11 on the same circumference with an arrangement pitch corresponding to the arrangement pitch of the work holding parts 11. I have.

The index cylinder 21 presses one of the index pins 20 in the index rotation direction X, and is specifically composed of an air cylinder. The index cylinder 21 has a cylinder body 21a mounted and supported on a fixed side (not shown), and a pressing member 22 swingably mounted on a tip end of a piston rod 21b. The pressing member 22 has a front end 22 a capable of engaging and disengaging from the index pin 20 and a rear end 2 a.
2b is linked with the spring 23 and is always urged in the direction of engagement with the index pin 20.

When the piston rod 21b of the index cylinder 21 projects, the pressing member 22
However, as shown in FIG. 4 (a), the indexing pin 20 on the carrier disk 2 is pressed to rotate the carrier disk 2 by an index.
The protrusion stroke b corresponds to the arrangement pitch of the work holding unit 11, that is, the index rotation amount.

The kickback mechanism 16 includes the carrier disk 2
Is rotated in the opposite direction to the index rotation direction (kickback operation).
And a spring mechanism 25.

The one-way clutch 10 allows only rotation of the carrier disk 2 in the index rotation direction X, and as described above, a bearing (not shown) for supporting the support shaft 2a of the carrier disk 2 in rotation. Are provided adjacently and integrally.

The spring mechanism 25 resiliently urges one of the index pins 20 in a direction opposite to the index rotation direction X. As shown in FIG.
Is pivotally supported by a support pin 27 so that an engagement roller 28 is freely rotatable at the tip of the swing arm 26, and the rear end thereof is linked to a resilient spring 29, and an indexing pin is provided. 20 is resiliently biased.

Then, the engaging roller 28 always pushes one of the index pins 20 on the carrier disk 2 in the reverse direction, that is, the one-way clutch 10 by the urging force of the resilient spring 29.
When the pressing force in the index rotation direction X by the index cylinder 21 is released, the carrier disk 2 is rotated in the reverse direction. The rotation amount in this case is determined by the one-way clutch 1
It is the amount of idle rotation until 0 works, that is, the lock stroke.

The carrier disk 2 is index-rotated as follows by the index device 3 configured as described above.

That is, when the piston rod 21b of the index cylinder 21 projects, the pressing member 2
2 presses one of the index pins 20, 20,... On the carrier disk 2 as shown in FIG. In this case, since the spring mechanism 25 constantly resiliently urges one of the index pins 20 in the direction opposite to the index rotation direction X, the carrier disk 2 exerts the elastic force of the spring mechanism 25. , And as a result, it is surely rotated by a predetermined index rotation amount.

On the other hand, when the pressing force in the index rotation direction X by the index cylinder 21 is released,
That is, when the pressing member 22 returns to the initial position for the next-stage index rotation by the retreat of the piston rod 21b, the elastic force of the spring mechanism 25 causes
The carrier disk 2 rotates reversely (kickback operation) by the lock stroll of the one-way clutch 10.

By the series of index rotations, the work holding portions 11, 11,.
Includes a workpiece loading position P ₁ for loading the workpiece W, it is sequentially indexed in the work processing position P ₂ for grinding the workpiece W. In this work processing position P _2, by the kick-back operation, the rear end side 11c of the workpiece holding portion 11 is away escaping from the rear end face of the work W slightly to the rear, a gap is formed between them, As a result, as described later, the thrust of the work W during the grinding and the action of restricting the work W in the axial direction by the stopper S are enabled. Further, the work holding unit 1 is operated by the above-described index operation.
1 rear end side surface 11c presses the rear end surface of the work W to perform the discharging operation.

The returning operation of the pressing member 22 is performed by the pressing member 22 riding over the succeeding index pin 20. That is, when the piston rod 21b retreats, the pressing member 22 pushes the arrow C to the succeeding index pin 20 against the elastic force of the elastic spring 23 as shown in FIG. While swinging and retreating in the direction (see the operation of →)
You will get over it. For this purpose, the pressing member 22
An inclined surface 24 for facilitating the evacuation operation is formed at the distal end portion 22a of the optical disk drive. In this case, the locking action of the one-way clutch 10 (prevention of reverse rotation) causes the carrier disk 2 to be in the stopped state, the pressing member 22 to return to the initial position, and the rearward of the subsequent indexing pin 20. They will face each other (the position indicated by the solid line in FIG. 2).

The workpiece carry-in device 4 is for carrying a workpiece W to the workpiece holding portion 11 of the carrier disc 2, in the work loading position P _1, is arranged on the side of the carrier disc 2.

FIG. 5 shows a specific configuration of the work loading device 4. The work loading member 30 and the loading cylinder 31 are provided.
As a main part.

The work carrying member 30 is in the form of a moving block, and has a downwardly arcuate holding recess 32 for holding the work W on its lower surface on the distal end side. The work carrying member 30 is configured to move on the movement guide 33 in a direction orthogonal to the rotation direction of the carrier disk 2 and to move forward and backward.

[0043] Then, in the advanced position of the work loading member 30, FIG. 5 (a), the as shown in (b), the holding recess 32, the workpiece holding portion of the carrier disc 2 at the workpiece loading position P ₁ 11 is located above. 5A and 5B, the holding recess 32 is opposed to the leading end opening of the loading chute 34 at the retreat position of the workpiece loading member 30. As shown in FIGS.

The carry-in chute 34 is in the form of a hollow carry-in pipe, and its tip is opened to the advance / retreat path of the work carry-in member 30, while its base end is connected to a work supply source such as a parts feeder outside the figure. ing. The workpieces W, W,... Continuously conveyed while being aligned in the carry-in chute 34 are in a state where the work carrying member 30 is at the retreat position and the holding recess 32 and the carry-in chute 34 coincide with each other coaxially. The first work W is sent out into the holding recess 32.

The carry-in cylinder 31 is provided with the work carry-in member 30.
The cylinder body 31a is specifically mounted and supported on a fixed side (not shown), and the tip of a piston rod 31b is connected to the work carrying member 30. .

Then, the work W is sequentially carried into the work holding part 11 of the carrier disk 2 from the carry-in chute 34 by the projecting / retracting operation of the piston rod 31b of the carry-in cylinder 31. That is, by the retreating operation of the piston rod 31b, the work carrying member 30 moves to the retracted position, and the holding recess 32 moves the work W
(The state shown in FIGS. 5A and 5B), and the projecting operation of the piston rod 31b causes the work carrying member 30 to move.
Moves to the advanced position, and the workpiece W in the holding recess 32 is moved.
There is inserted dropped into the work holding portion 11 of the carrier disc 2 at the workpiece loading position P _1. At this time, the holding recess 3
The end face and the lower part of the work W in 2 are guided by the guide surface of the moving guide 33, so that the positioning and carrying into the work holding part 11 are reliably performed. These series of operations are performed sequentially and continuously in synchronization with the index rotation of the carrier disk 2.

The work unloading chute 5 is of a circular-arc cross section for unloading grinding machined workpiece W, and provided in the work processing position P ₂ near. More specifically, the work discharge chute 5 has a base end connected to the discharge end of the blade B and a front end connected to a housing (not shown). It has an inclined structure to be discharged.

The control device 6 includes various devices of the centerless grinding machine (drive sources of the grinding wheel G and the adjusting wheel R, etc.) and various devices of the work supply device 1 (the index device 3, the cylinders 21 and 31 of the work carry-in device 4, etc.). ) Is automatically controlled in conjunction with each other, and specifically, is a CNC device including a microcomputer including a CPU, a ROM, a RAM, an I / O port, and the like. In the control device 6, a control program for executing a grinding process described below is selectively and appropriately set as numerical control data in advance by a keyboard or the like of an operation panel (not shown).

Next, a description will be given of a grinding process in a centerless grinding machine provided with the above-described work supply device 1 (see FIG. 6). In this case, all of the following series of steps are performed in synchronization with the index rotation of the carrier disk 2 by the index device 3.

[0050] With the index rotation of the carrier disc 2, the work holding unit 1 located at the workpiece loading position P ₁
The work W is dropped and carried in by the above-described operation of the work carrying device 4 (see FIG. 6). In the drawing, three work holding parts 11, 1 have already been
The state where the workpiece W is carried in and held for each of the workpieces 1 and 11 is shown.

[0051] Further, when the carrier disc 2 is indexed rotating, before the work holder 11 of the lower portion of the work supply position P ₂ is, is indexed to the work supply position P _2, the workpiece W in the workpiece holder 11 is a blade It is dropped and supplied onto B (see FIG. 6).

Subsequently, the carrier disk 2 is slightly reversed (kickback) by the kickback mechanism 16. As a result, the work holding portion 11 also slightly retreats, and a gap is formed between the rear end side surface 11c and the rear end surface of the work W, as described above, so that the work W can be brought into contact with the stopper S. (See FIG. 6).

In this state, the grinding wheel G and the adjusting wheel R are driven to rotate, and the cutting wheel G is cut and fed.
Grinding is performed on the outer diameter surface of the work W. At this time, the work W is retracted by the thrust given to the work W by the grinding process, and the rear end surface thereof abuts and locks on the stopper S. Grinding by G is performed (see FIG. 6). At the same time,
In the work loading position P _1, the above-described workpiece carrying operation is performed.

When the grinding is completed, the carrier disk 2 is again rotated by the index, and the workpiece W that has been ground is, as described above, the rear end side surface 1 of the workpiece holding unit 11.
The rear end face is pressed by 1c, and is dropped from the blade B to the discharge chute 5 (see FIG. 6). At the same time, a subsequent workpiece holder 11 to the work supply position P ₂ is indexed, the workpiece supply operation is performed in.

Since the indexing device 3 is configured to intermittently rotate the carrier disk 2 at an index pitch corresponding to the arrangement pitch of the work holding portions 11, the work processing position P _{In 2} , the discharge of the workpiece W after the grinding and the supply of the workpiece W held by the subsequent workpiece holding unit 11 for the grinding are performed in one continuous process by the index operation of the carrier disk 2. It will be. As a result, the time required for loading and unloading of the work W is significantly reduced as compared with the related art (about one time in the related art).
/ 4 to 1/6 cycle time), and furthermore, the processing cycle time in in-feed grinding can be shortened, and the grinding operation efficiency is improved.

The main structure of the work supply device 1 is a carrier disk 2 having a simple structure as shown in the figure, and an index device 3 for rotating the carrier disk 2 by an index.
Therefore, the structure of the apparatus is simple and small, and the operation thereof is simple only by the rotation of the carrier disk 2 by the index.

In particular, the work holding section 11 is opened outwardly from the outer peripheral edge of the carrier disk 2 and holds the work W such that the axis of the work W is oriented in the rotation direction of the carrier disk 2. to become comprises a geometry for holding, at the time of the index supplied workpiece W to the work processing position P _2, then was allowed to drop onto the blade B by the work W is its own weight, by the stopper S, the axial direction regulating action, that An axial positioning action is performed. On the other hand, during the work discharged from the work processing position P _2, the rear end side 11c of the workpiece holding portion 11 forms a discharge action presses the rear end face of the workpiece W.

The above-described embodiment merely shows a preferred embodiment of the present invention, and the present invention is not limited to this, and various design changes can be made within the scope.

For example, each constituent device of the work supply device 1,
That is, the specific configurations of the index device 3 and the work loading device 4 are not limited to those shown in the drawings, and other structures having similar functions can be adopted.

As an example, in the illustrated embodiment,
As the index device 3, indexing pins 20, 20,.
Is pressed by the linear motion of the index cylinder 21 to rotate the index, but may be constituted by an index motor such as a servomotor.

In this case, the index motor is configured to intermittently rotate the carrier disc 2 by the index pitch. If this rotation control can be performed with high accuracy, the work stopper S may be omitted, and the rear end side surface 11c of the work holding unit 11 may serve as a stopper.

[0062]

As described in detail above, according to the present invention,
A carrier disk, which is rotatably supported and has a plurality of work holding portions for holding the work on the outer peripheral edge thereof at a predetermined arrangement pitch in the circumferential direction, and an index for index-rotating the carrier disk. This index device is configured to intermittently rotate the carrier disk with an index pitch corresponding to the arrangement pitch of the work holding unit, so that the grinding process is performed at the work processing position. The discharge of the finished workpiece and the supply of the workpiece held by the subsequent workpiece holding unit for grinding are performed in one continuous process and at high speed by the indexing operation of the carrier disk. Grinding work efficiency in the centerless grinding machine of the system is greatly improved. In particular, in the case of grinding mass-produced products, a significant reduction in processing cost can be expected by shortening the processing cycle time.

The main structure of the workpiece supply device of the present invention is composed of a carrier disk having a simple structure and an index device for rotating the carrier disk by an index. The operation is also simple only by the index rotation of the carrier disk, and it is possible to provide a small-sized and inexpensive work supply device with a simple structure.

In addition, since the device configuration of the work supply device is simple, the relative arrangement of peripheral devices such as a grinding wheel, an adjusting wheel, and a blade can be easily, quickly and accurately adjusted. The workability in maintenance is good, and maintenance cost can be reduced, such as easy and quick maintenance / inspection of the workpiece and changeover of the workpiece due to the change of the standard dimensions of the work.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing the entire configuration of a centerless grinding machine provided with a work supply device according to an embodiment of the present invention.

FIG. 2 is a front view showing a schematic configuration of the work supply device.

FIG. 3 shows a carrier disk of the work supply device, a grinding wheel,
It is an enlarged front view which shows the arrangement relationship with an adjustment wheel and a carrier disk.

FIG. 4 is a plan view showing an index device in the work supply device, wherein FIG. 4 (a) shows a schematic configuration, and FIG. 4 (b) shows an operation when the pressing member retreats.

5A and 5B are diagrams showing a configuration and an operation of a work loading device in the work supply device, wherein FIG. 5A is a plan view and FIG. 5B is a side view.

FIG. 6 is a schematic diagram for explaining the operation of the work supply device.

FIG. 7 is a schematic diagram for explaining work supply in a conventional infeed type centerless grinding machine.

[Explanation of symbols]

W Work X Index rotation direction P ₁ Work loading position P ₂ Work processing position G Grinding wheel R Adjustment wheel B Blade S Work stopper (stopper) 1 Work supply device 2 Carrier disk 2a Support shaft 3 Index device 4 Work loading device 5 Work Unloading chute 6 Control device 10 One-way clutch 11 Work holding part 12 Guide part 15 Index mechanism 16 Kickback mechanism 20 Index pin 21 Index cylinder (index driving means) 22 Pressing member 25 Spring mechanism

Claims (5)

[Claims] 1. A centerless grinding machine for centerlessly grinding a cylindrical outer diameter surface of a workpiece by infeed, wherein the centerless grinding machine rotatably supports the workpiece and holds the workpiece on an outer peripheral edge. The work holding part is provided with a carrier disc provided with a predetermined arrangement pitch in a circumferential direction, and an index device for rotating the carrier disc by an index. The indexing device has a shape that is opened outward from the outer peripheral edge and holds the workpiece so that the axis is oriented in the rotation direction of the carrier disk. With the index pitch corresponding to, the carrier disk is configured to intermittently rotate the index, by the index rotation of the carrier disk, The work holding unit is indexed into a work loading position for loading the work and a work processing position for grinding the work, and after the completion of the grinding of the work, the rear end side surface of the work holding unit is processed. A work supply device for a centerless grinding machine, characterized in that the work supply device is configured to perform a material discharging operation. 2. The carrier disk is rotatably supported along a plane parallel to an axis between a grinding wheel and an adjustment wheel in a centerless grinding machine, and an outer diameter of the carrier disk is The work holding portion on the outer peripheral edge of the carrier disk is set so as to pass above and near the support surface of the blade supporting the workpiece, and the thickness of the carrier disk is at least the final finish of the workpiece. A guide portion that is set to be smaller than an outer diameter dimension and is provided so as to cover an outer peripheral edge of the carrier disk, and guides a workpiece in the work holding portion from the work loading position to the work processing position; 2. The centerless grinding machine according to claim 1, wherein the blade provided at the workpiece processing position has a stopper that acts to regulate an axial direction of the workpiece. Feeding device. 3. The index device includes an index mechanism for pressing and rotating the carrier disk by the index pitch, and a kickback mechanism for positioning and rotating the carrier disk in a direction opposite to the index rotation direction. The index mechanism includes a plurality of index pins provided on one side surface of the carrier disk with an arrangement pitch corresponding to an arrangement pitch of the work holding unit, and one of the index pins is rotated by an index. Index drive means for pressing in a direction, the kickback mechanism includes a one-way clutch that allows only rotation of the carrier disk in the index rotation direction, and one of the index pins in the index rotation direction. And a spring mechanism for resiliently biasing in the opposite direction. Or centerless grinding machine of the workpiece supply device according to 2. 4. The work supply device for a centerless grinding machine according to claim 1, wherein the index device comprises an index motor for intermittently rotating the carrier disk by the index pitch. 5. A work loading device which is provided at the work loading position and sequentially loads a workpiece into a work holding portion of the carrier disk in synchronization with the index rotation of the carrier disk, and a work loading device near the work processing position. The work supply device for a centerless grinding machine according to any one of claims 1 to 4, further comprising a work take-out chute provided to carry out the ground work.