JP6842703B2 - Work supply method and work supply device for centerless grinding equipment - Google Patents

Description

The present invention relates to a work supply method for supplying a work to a centerless grinding machine and a work supply device for realizing this method.

As an apparatus for supplying the workpiece to the centerless grinding apparatus for polishing the cylindrical workpiece, for example, the following devices have been proposed.
In the device proposed in Patent Document 1, a work is placed on a columnar rotating body that is substantially parallel in the horizontal direction and inclined in the vertical direction in opposite directions so that the axes are in the same direction as these axes. The two rotating bodies are rotated in the same direction and at different peripheral speeds to supply the workpiece to the centerless grinding machine (grinding grindstone and adjusting wheel).

In the apparatus proposed in Patent Document 2, a workpiece storage cylinder is arranged in the vicinity of a centerless grinding apparatus in which rollers are lined up in a substantially vertical direction, and the workpieces are vertically stacked and accommodated in the work storage cylinder at the bottom. The work is pushed forward by the hydraulic cylinder on the shoe mounting member, and the machined work already existing at the machining position in the work centerless grinding machine is pushed out, and the unmachined work is supplied to this position.

In the apparatus proposed in Patent Document 3, a plurality of guide rollers are arranged in two rows in substantially parallel with their axes slightly tilted toward the centerless grinding apparatus, and the workpiece is moved by rotating the two rows of guide rollers. Supply to centerless grinding equipment.

JP-A-2007-190646 Japanese Unexamined Patent Publication No. 11-077494 Japanese Unexamined Patent Publication No. 08-090394

The apparatus proposed in Patent Document 1 is performed by supplying a workpiece to a centerless grinding apparatus by sequentially pushing out the workpieces to a plurality of workpieces arranged behind the workpieces and moved by two cylindrical rotating bodies. The device proposed in Patent Document 1 is suitable for combination with a grinding method (device) that grinds continuously delivered workpieces for a certain period of time with a grinding wheel and an adjusting wheel while moving each of them. However, the apparatus proposed in Patent Document 1 cannot be directly adopted in a process of grinding workpieces one by one according to a specific procedure, such as super-finishing.

On the other hand, the apparatus proposed in Patent Document 2 can extrude the workpieces one by one with a hydraulic cylinder, and thus can be adopted for grinding the workpieces according to a specific procedure. However, the apparatus proposed in Patent Document 2 is a centerless grinding apparatus in which the rollers are lined up in a substantially horizontal direction because the workpieces are vertically stacked and the workpieces extruded by the hydraulic cylinder move forward on the shoe mounting member. It cannot be adopted as it is.

Patent Document 3 describes the supply of long workpieces (longer than the diameter), but the apparatus proposed in Patent Document 3 grinds not so long workpieces such as cylindrical rollers one by one. not suitable for applications Before moving to.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a work supply method and a work supply device capable of supplying workpieces having a circular cross section such as rollers one by one to a centerless grinding apparatus. ..

The work supply method to the centerless grinding apparatus according to the present invention targets the centerless grinding apparatus in which the workpiece is placed on two rollers and ground. In the method, the work is placed on a work mounting portion having a width smaller than the diameter thereof, and the work is placed so that the axis of the work coincides with the axial direction of the roller just above the substantially middle of the two rollers. Move the part. Subsequently, by lowering the work mounting portion on which the work is placed, only the work mounting portion is passed between the two rollers, and the work is placed on the two rollers.

When the work mounting portion is moved directly above the roller by operating the ball screw with a servomotor, the position of the work mounted on the roller can be controlled more accurately.
When the work mounting portion is lowered by operating the ball screw with a servomotor, the speed at which the work mounting portion is lowered can be accurately controlled.
The work supply device according to the present invention is preferably combined with a centerless grinding device for grinding a work by placing it on two rollers.

The work supply device includes a work mounting portion on which the work is placed, a horizontal moving means for reciprocating the work mounting portion in the horizontal direction, and a vertical moving means for reciprocating the work mounting portion in the vertical direction.
When the work mounting portion reaches one end in the horizontal direction, the work mounting portion protrudes to the one side of the horizontal moving means.

Preferably, a servomotor and a ball screw are used as the horizontal moving means.
Preferably, a servomotor and a ball screw are used as the vertical moving means .
Word over click mounting portion is engaged with the horizontal direction of the other side (opposite to the protruding side) in the vicinity, the move together with the work placing portion during grinding by the centerless grinding apparatus work A locking portion for this is provided at a position higher than the work mounting portion.

According to the present invention, it is possible to provide a work supply method and a work supply device capable of supplying workpieces having a circular cross section such as rollers one by one to an appropriate grinding position in a centerless grinding apparatus.

FIG. 1 is a front view of the work supply device. FIG. 2 is a plan view of the work supply device. FIG. 3 is a side sectional view of the work supply device. FIG. 4 is a diagram showing an outline of the upper locking portion and the lower locking portion. FIG. 5 is a diagram showing a process in which the work supply device supplies the work to the centerless grinding device. FIG. 6 is a diagram showing a process in which the work supply device supplies the work to the centerless grinding device. FIG. 7 is a diagram showing a process in which the work supply device supplies the work to the centerless grinding device. FIG. 8 is a diagram showing how the work supply device supplies a small work to the centerless grinding device. FIG. 9 is a diagram showing how the workpiece supply device supplies tapered rollers to the centerless grinding device.

1 is a front view of the work supply device 1, FIG. 2 is a plan view of the work supply device 1, FIG. 3 is a side sectional view of the work supply device 1, and FIG. 4 is a view of the upper locking portion 62 and the lower locking portion 63. It is a figure which shows the outline. Here, the partial cross section of FIG. 3 is the one seen by the arrow AA in FIG. 1, and (a), (c), and (e) in FIG. 4 are the upper locking portion 62, the lower locking portion 63, and the like. (B), (d), (g) is a front view of the locking portion 71B, (g) is a right side view of the upper locking portion 62, the lower locking portion 63 and another locking portion 71B, and (f) is another It is a left side view of the locking portion 71B.

The work supply device 1 includes a base portion 2, a vertical moving means 3, a connecting portion 4, a horizontal moving means 5, a work holding portion 6, and a work stopper 7.
The base 2 supports the vertical moving means 3, the horizontal moving means 5, and the like.
The base portion 2 includes a substrate 11 that supports the entire work supply device 1 and an overall support portion 12 that stands upright from the substrate 11. The substrate 11 is formed by stacking two substantially rectangular plate members.

The overall support portion 12 has a substantially rectangular support body 13 and a bearing support portion 14. The support body 13 has a rectangular plate and a pair of rail holding portions 15 and 15 extending vertically along the long side of the rectangle. The bearing support portion 14 is arranged at the upper end of the support main body 13 and is for holding the fixing bearing 24 of the ball screw 17 and the vertical movement motor 18 constituting the vertical movement means 3 described later.

The vertical moving means 3 moves the connecting portion 4, the work holding portion 6 and the work stopper 7 in the vertical direction (vertical direction). The vertical moving means 3 is composed of two sets of linear guides 16 and 16, a ball screw 17, a vertical moving motor 18, and the like.
The linear guide 16 includes a rail 21 and a pair of sliders 22 and 22 that are integrated with the rail 21 and reciprocate in the longitudinal direction. The rails 21 and 21 are fixed to the rail holding portions 15 and 15 which are different from each other so as to be parallel to each other in a state of extending in the vertical direction. The linear guide 16 is a well-known machine element component. All of the sliders 22, ..., 22 in the linear guides 16 and 16 are fixed to the back plate 31 (described later) in the connecting portion 4.

The ball screw 17 includes a screw shaft 23, a fixing bearing 24 through which the screw shaft 23 penetrates, and a nut portion 25 capable of reciprocating the screw shaft 23 in the longitudinal direction. The ball screw 17 has a fixing bearing 24 integrated with the bearing support portion 14 so that the screw shaft 23 is parallel to the rail 21 of the linear guide 16. A timing pulley 26 is attached to the upper end of the screw shaft. The nut portion 25 of the ball screw 17 is fixed to the connecting portion 4 (the back plate 31 in the ball screw 17) that connects the horizontal moving means 5.

The vertical movement motor 18 has its shaft projected upward and is fixed to the bearing support portion 14 on the same side as the support main body 13 with respect to the ball screw 17. A timing pulley 27 is attached to the shaft of the vertical movement motor 18 protruding from the bearing support portion 14. The timing pulley 27 and the timing pulley 26 of the screw shaft 23 are connected by a timing belt 28. A servomotor is used as the vertical movement motor 18.

In the vertical moving means 3, the screw shaft 23 is rotated by the rotation of the vertical moving motor 18, and the sliders 22, ..., 22 guided by the rails 21 and 21 are moved up and down together with the nut portion 25. As a result, the nut portion 25 and the connecting portion 4 integrated with the sliders 22, ..., 22 also move up and down.
The connecting portion 4 integrates the horizontal moving means 5, the work holding portion 6, and the work stopper 7 with the vertical moving means 3 (nut portion 25, sliders 22, ..., 22). The connecting portion 4 includes a back plate 31, a holding plate 32, and the like.

The back plate 31 is formed of a substantially rectangular plate material, and is integrated with the nut portion 25 and the sliders 22, ..., 22.
The holding plate 32 is formed of an elongated rectangular plate material, and one long side of the rectangle is fixed to the back plate 31 in a substantially horizontal state.
The horizontal moving means 5 is a means for moving the work holding portion 6 and the work stopper 7 in the horizontal direction. The horizontal moving means 5 includes a uniaxial actuator 35, a horizontal moving motor 36, and the like.

The uniaxial actuator 35 includes a main body 37, a ball screw 38, a slider 39, and the like. The main body 37 is an elongated box whose upper surface is open. Above the opening of the main body 37, a cover unit 41 having a length longer than the opening and a width substantially equal to the opening is provided. At one end of the main body 37 in the longitudinal direction, a substantially rectangular plate-shaped plate 40 extends below the main body 37 with its longitudinal direction orthogonal to the longitudinal direction of the main body 37.

Both ends of the screw shaft 42 of the ball screw 38 are rotatably supported by bearings at both ends in the longitudinal direction of the main body 37. The end of the screw shaft 42 on the plate 40 side protrudes further outward from the plate 40, and the timing pulley 43 is fixed to the protruding end.
The slider 39 is integrated with the nut portion of the ball screw 38, and reciprocates in the main body 37 in the longitudinal direction as the screw shaft 42 rotates. The slider 39 is integrated with a base 44 that straddles the cover unit 41 from above.

The horizontal movement motor 36 is fixed to the plate 40 so that its shaft is parallel to the screw shaft 42 and the shaft protrudes from the plate 40 to the same side as the timing pulley 43 of the screw shaft 42. A timing pulley 45 is attached to the shaft of the horizontal movement motor 36. The timing pulley 45 of the horizontal movement motor 36 is connected to the timing pulley 43 of the screw shaft 42 by a timing belt 46. A servomotor is used as the horizontal movement motor 36.

The horizontal moving means 5 reciprocates the slider 39 by the rotation of the horizontal moving motor 36, whereby the base 44 integrated with the slider 39 reciprocates.
The work holding portion 6 has an arm portion 51, a work mounting portion 52, and the like.
The arm portion 51 is an elongated plate as a whole, and its longitudinal direction coincides with the moving direction of the slider 39, and one long side end surface of a rectangle in the vicinity of one end in the longitudinal direction is fixed to the base 44. ing. That is, the arm 51 expands upward from the base 44 and expands to the side opposite to the side where the horizontal movement motor 36 is arranged in the moving direction of the slider 39.

The work mounting portion 52 includes a work table 53 and a pair of work stoppers 54 and 54. The work table 53 has a work mounting portion 52 whose length is longer than its width and height, and its shape is a combination of the short bases of the two right-angled trapezoids in a side view (FIG. 3). This cross-sectional shape is abbreviated as "union trapezoid") and is plane symmetric. Here, the trapezoidal "short base" means the shorter of the two bases. The longer of the two bases of the trapezoid is called the "long base".

The work table 53 has a united trapezoidal cross section as well as the cross section of the basic portion 55a thereof, and the cross section is a right-angled trapezoid, and the lengths of the short base and the long base are slightly different. ... 55d is formed by stacking many layers. Two additional materials 55b, ... 55d having the same size are prepared. The additional materials 55b, ... 55d have the same length as, for example, the long base in the cross section of the additional material 55b on the inner side of the overlap and the short base in the cross section of the additional material 55c overlapped on the outer side (basic portion 55a and the additional material). The relationship with 55b is the same). The inner addendum 55b and the outer addendum 55c have two consecutive legs in cross section.

The work base 53 is formed by detachably integrating a plurality of sets of additional members 55b, 55c, 55d with respect to the basic portion 55a by screws 56, 56 (see FIG. 3).
The work base 53 is attached to the upper end surface of the arm 51 that extends to the opposite side of the horizontal movement motor 36 so as to protrude from the arm 51.
By the way, the arm 51 is not exactly rectangular in the front view (FIG. 1). However, it is sufficient that the arm portion 51 is integrated with the base 44 below the vicinity of one end in the longitudinal direction and supports the work mounting portion 52 or the like above near the end opposite to the base 44. , It does not have to be rectangular.

The pair of work stoppers 54 and 54 project upward at positions slightly separated from both ends of the elongated work base 53. The work stopper 54 projects upward from the basic portion 55a of the work table 53, and its width (horizontal dimension in FIG. 3) is the same as or smaller than that of the basic portion 55a. The work stoppers 54 and 54 both have a surface facing the work table 53. The work stoppers 54 and 54 are for limiting the movement of the work on the work table 53 in the axial direction.

The work stopper 7 includes an extension portion 61, an upper locking portion 62, a lower locking portion 63, and the like.
The extension portion 61 is located on the horizontal movement motor 36 side (base 44 side) with respect to the work mounting portion 52, and extends upward from the arm portion 51. The upper locking portion 62 has a rotating shaft located near the upper end of the extending portion 61 and extends in the longitudinal direction of the work table 53, and a large ball bearing 64 is integrated with the rotating shaft.

The lower locking portion 63 includes a rotating shaft parallel to the rotating shaft of the upper locking portion 62 below the rotating shaft of the upper locking portion 62, and a small ball bearing 65 is integrated with this rotating shaft. ..
The upper locking portion 62 and the lower locking portion 63 are used to lock the end faces of the work and prevent the work from falling off from the rollers in centerless grinding performed by rotating a pair of rollers holding the work in the same direction. belongs to. The locking surfaces 66 and 67 that lock the end faces of the work in the upper locking portion 62 and the lower locking portion 63 both face the work table 53 direction and have a circular shape with respect to the respective rotation axes. It is rotatable. The upper locking portion 62 and the lower locking portion 63 are removable and can be replaced with other locking portions having a locking surface suitable for the diameter of the work. The "locking surface suitable for the diameter of the work" is, as a premise, a size that does not protrude from the end surface when the locking surface comes into contact with the end surface of the work to be locked.

Instead of the rotatable upper locking portion 62 and lower locking portion 63 having ball bearings 64 and 65, another locking portion 71B in which the spherical surface 72B protrudes from the end face facing the work table 53 direction can be adopted. Since the locking portion 71B contacts the end face of the work at a point when locking the end face, it is possible to prevent the rotating work from falling off without resisting the rotation of the work. Another locking portion 71B having a convex spherical surface 72B can be used for a work having a recess in the center of the end face.

Next, the supply of the work W to the centerless grinding device by the work supply device 1 will be described.
5 to 7 are diagrams showing a process in which the work supply device 1 supplies the work W to the centerless grinding device. In FIGS. 5 and 6, (b) is a view taken along the line BB of (a). In FIG. 7, (b) and (d) are BB arrow views of (a) and (c), respectively. The hatching showing the cross section in FIGS. 5 (b), 6 (b) and 7 (b), (d) is omitted.

The centerless grinding device referred to here includes a device that performs "polishing (, super-finishing)" for making the surface a mirror surface, in addition to a device that performs so-called "grinding".
The work supply device 1 receives the work W on the work table 53 from a work transfer device (not shown) or the like at a position where the work holding unit 6 is separated from the two rollers Rr and Rl of the centerless grinding device. The work W shown in FIG. 5 is a cylindrical roller.

In the work supply device 1, the horizontal moving means 5 operates, that is, the horizontal moving motor 36 and the uniaxial actuator 35 are operated to move the base 44 integrated with the work holding portion 6 toward the rollers Rr and Rl. Let me. The work supply device 1 stops the operation of the horizontal moving means 5 when the work W held by the work holding unit 6 reaches directly above the two rollers Rr and Rl (work holding unit by the alternate long and short dash line in FIG. 5). 6).

Subsequently, the work supply device 1 operates the vertical moving means 3, that is, operates the vertical moving motor 18, the ball screw 17, and the like to lower the work holding portion 6 that holds the work W, the horizontal moving means 5, and the like. Let me. Since the diameter of the work W is larger than the distance between the two rollers Rr and Rl, the work W is placed on the rollers Rr and Rl from the work table 53 in the middle of the descent (FIG. 6).

Even after the work W is transferred to the rollers Rr and Rl, the vertical moving means 3 further keeps the work until the rotation axis of the ball bearing 64 in the upper locking portion 62 of the work stopper 7 coincides with the axis of the work W. The holding portion 6, the horizontal moving means 5 and the like are lowered (FIGS. 7A and 7B)).
When the ball bearing 64 of the upper locking portion 62 coincides with the axis of the work W, the horizontal moving means 5 operates again until the locking surface 66 of the upper locking portion 62 abuts on the end surface of the work W. The stopper 7 (base 44) is moved toward the rollers Rr and Rl.

When the work W is supplied to the centerless grinding device by the work supply device 1, the control device (microcomputer, storage device, input / output interface, etc.) that controls the operation of the centerless grinding device is used for the set value and the horizontal moving means 5, etc. This is performed by controlling the operations of the vertical moving motor 18 and the horizontal moving motor 36 based on the signals from the provided proximity sensors.

Through the above process, the work supply device 1 supplies the work W onto the rollers Rr and Rl in the centerless grinding device, and the work W peripheral surface can be ground by the grindstone Gs at an appropriate position. Further, in the work supply device 1, in the grinding process of the peripheral surface of the work W, the locking surface 66 of the upper locking portion 62 comes into contact with the end surface of the work W, and the work W falls off from the end surface side of the rollers Rr and Rl. Be prevented.

In the work stopper 7, the locking surface 66 of the upper locking portion 62 for locking the work W rotates together with the work W around an axis common to the rotation axis of the work W, so that the end surface of the work W due to slippage, rubbing, etc. The occurrence of damage is prevented.
FIG. 8 is a diagram showing how the work supply device 1 supplies smaller work Ws (cylindrical rollers) to the centerless grinding device. In FIG. 8, (b), (d), and (f) are CC arrow views in (a), (c), and (e), respectively, and (a), (c), and (e) are (e), respectively. It is a DD arrow view in b), (d), and (f). The hatching showing the cross section in (b), (d), and (f) is omitted.

In grinding of workpieces Ws smaller than the work W described above, the distance between the two rollers Rr and Rl in the centerless grinding apparatus is further narrowed. Therefore, the work table 53 in the work supply device 1 is adjusted so that the additional members 55b, 55c, 55d are sequentially removed from the outside so that the work mounting portion 52 has a width Ds that allows the work mounting portion 52 to pass between the rollers Rr and Rl. ..
Further, in the work stopper 7, the optimum locking portion for the diameter of the work Ws is selected from the upper locking portion 62, the lower locking portion 63, and other equivalents of other sizes. Here, the lower locking portion 63 is adopted. In the work supply device 1, the upper locking portion 62 having a locking surface larger than the locking surface 67 of the adopted lower locking portion 63 hinders the action of the lower locking portion 63, so that the work stopper 7 is used in advance. Is removed from.

The work Ws supplied by the work supply device 1 to the centerless grinding device is performed in the same process as the above-mentioned supply of the work W.
That is, the work supply device 1 receives the work Ws on the work table 53 from a work transfer device (not shown) or the like, operates the horizontal moving means 5, and is held by the work holding unit 6 (work mounting unit 52). The work Ws is moved directly above the two rollers Rr and Rl (FIGS. 8A and 8B).

Subsequently, the work supply device 1 operates the vertical moving means 3 to lower the work holding portion 6. The work Ws cannot pass through the gap between the two rollers Rr and Rl while the work holding portion 6 is descending, and is held by the rollers Rr and Rl (FIGS. 8 (c) and 8 (d)).
The work supply device 1 further lowers the work holding portion 6, and when the rotation axis of the ball bearing 65 in the lower locking portion 63 coincides with the axis of the work Ws, the work holding portion 6 is operated to operate the horizontal moving means 5. Is moved again in a certain direction by the rollers Rr and Rl. The horizontal movement of the work holding portion 6 ends when the work Ws reaches the grinding position by the centerless grinding device (FIGS. 8 (e) and 8 (f)).

The work supply device 1 can accurately supply workpieces W and Ws of various sizes one by one to the grinding processing position in the centerless grinding device.
FIG. 9 is a diagram showing how the workpiece supply device 1 supplies tapered rollers (hereinafter referred to as “work Wc”) to the centerless grinding apparatus. In FIG. 9, (b), (d), and (f) are EE arrow views in (a), (c), and (e), respectively, and (a), (c), and (e) are (e), respectively. It is FF arrow view in b), (d), (f).

When grinding tapered rollers Wc, the centerless grinding device replaces the two columnar rollers Rr and Rl with rollers Rc and Rd having a truncated cone shape.
The work Wc is supplied to the centerless grinding device by the work supply device 1 in the same process as the above-mentioned supply of the work W and the work Ws.
That is, the work supply device 1 receives the work Wc from the work transfer device or the like on the work table 53, operates the horizontal moving means 5 to advance the work holding portion 6, and moves the work Wc to the two rollers Rc and Rd. Move it directly above the middle (FIGS. 9 (a) and 9 (b)).

Next, the work supply device 1 lowers the entire horizontal moving means 5 including the work holding portion 6. While the work holding portion 6 is descending, the work Wc cannot pass through the gap between the two rollers Rc and Rd and stops on the rollers Rc and Rd (FIGS. 9 (c) and 9 (d)).
The work supply device 1 further lowers the work holding portion 6 so that the rotation axis of the ball bearing 64 (FIGS. 4A and 4B) in the upper locking portion 62 coincides with the axis of the work Wc. Subsequently, the work supply device 1 moves the work holding portion 6 in the roller Rc and Rd directions again by the horizontal moving means 5, and when the work Wc reaches an appropriate position on the rollers Rc and Rd, the work Wc is supplied. Is terminated (FIGS. 9 (e) and 9 (f)).

In the above-described embodiment, the operation of the ball screws 17 and 38 in the vertical moving means 3 and the horizontal moving means 5 may be performed by another means, for example, a combination of a rack and a pinion.
The width of the work table 53 is changed by the additional materials 55b, ... 55d so as to correspond to works having different sizes (particularly diameters), but a plurality of work tables having different widths are prepared and the work table itself is used as the work. It may be changed according to the size.

Further, in the above-described embodiment, the work holding portion 6 or the like is interposed with the vertical moving means 3 for moving in the vertical direction, and the work is held in the portion that is moved in the vertical direction by the vertical moving means 3. A horizontal moving means 5 for moving the portion 6 in the horizontal direction is provided. On the contrary, a means for moving the work holding portion in the horizontal direction may be provided first with respect to the base portion 2, and a means for moving the work holding portion in the vertical direction may be provided in the portion moving in the horizontal direction.

In addition, each configuration or overall structure, shape, size, number, material, etc. of the work supply device 1 and the work supply device 1 can be appropriately changed according to the gist of the present invention.

The present invention can be used when supplying a circular roller or the like to a centerless grinding machine.

1 Work supply device 3 Vertical moving means 5 Horizontal moving means 17 Ball screw 18 Vertical moving motor (servo motor)
36 Horizontal movement motor (servo motor)
38 Ball screw 52 Work mounting part 62 Upper locking part (locking part)
63 Lower locking part (locking part)
Rr, Rl roller Rc, Rd roller W work (cylindrical roller)
Ws Small work (cylindrical roller)
Wc work (tapered rollers)

Claims (7)

This is a method of supplying workpieces to a centerless grinding machine that mounts workpieces on two rollers and grinds them.
The work is placed on a work mounting portion having a width smaller than the diameter of the work.
The work mounting portion is moved so that the axis of the work coincides with the direction of the axis of the roller just above the substantially middle of the two rollers.
To a centerless grinding apparatus characterized in that by lowering the work mounting portion on which the work is placed, only the work mounting portion is passed between the two rollers and the work is placed on the two rollers. Work supply method. The work supply method to the centerless grinding apparatus according to claim 1, wherein the work mounting portion is moved toward directly above the roller by operating a ball screw with a servomotor. The work supply method to the centerless grinding apparatus according to claim 2, wherein the work mounting portion is lowered by operating a ball screw with a servomotor. A work supply device that mounts a work on two rollers in a centerless grinding machine.
The work mounting part on which the work is placed and
A horizontal moving means for reciprocating the work mounting portion in the horizontal direction,
Have a, and vertical moving means for reciprocating the workpiece mounting part in the vertical direction,
A work supply device, characterized in that the work mounting portion projects toward the one side of the horizontal moving means when it reaches one end in the horizontal direction. The work supply device according to claim 4, wherein a servomotor and a ball screw are used as the horizontal moving means. The work supply device according to claim 4, wherein a servomotor and a ball screw are used as the vertical moving means. On the other side of the horizontal direction in the vicinity of the front Symbol workpiece mounting portion, the locking portion for locking the workpiece by moving integrally with the workpiece mounting part during grinding by the centerless grinding apparatus wherein The work supply device according to any one of claims 4 to 6, which is provided at a position higher than the work mounting portion.