JPS6331888Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention (1) Industrial application field This invention is a rotary shaft that is rotatably supported on a grinding wheel support and is fixed with a screw to the end of the rotating shaft, with a part exposed. The present invention relates to a grindstone attachment/detachment assisting device that is surrounded by a grindstone cover.

(2) Prior Art Conventionally, when attaching and detaching a grindstone used in a tooth grinding machine, an operator holds the grindstone from outside the base of the tooth grinder and performs the attachment and detachment work.

(2) Problems that the invention aims to solve The grindstone used in tooth grinding machines is relatively heavy, for example, about 25 kg, and the distance between the working position outside the base and the mounting position of the rotating shaft is, for example, about 500 mm. As a result, work efficiency is extremely poor, and moreover, there is a risk that the whetstone will hit the rotating shaft during attachment and detachment work, causing dents. In addition, in order to protect the nut threaded part of the rotating shaft, it is necessary to attach a protector to the nut threaded part when attaching or removing the grindstone.

In order to overcome these conventional drawbacks, a jig that holds the grinding wheel from outside the tooth grinding machine has been proposed, but this jig is not currently used due to problems such as storage space and workability. do not have.

The present invention has been developed in view of the above circumstances, and it makes it extremely easy to attach and detach the grinding wheel to the rotating shaft, reducing the burden on the worker, and also makes it possible to attach and remove the grinding wheel from the rotating shaft and the grinding wheel without the need for special protective equipment. The purpose of the present invention is to provide an auxiliary device for attaching and detaching a grindstone to enable protection.

B. Structure of the invention (1) Means for solving the problems According to the invention, the whetstone cover is a cylinder having an arcuate cross section and surrounding the whetstone and having a notch on the side through which the whetstone can be exposed. A cover body is fixed to the grinding wheel support base with a part, and the cover body is removably fixed to the end of the cover body opposite to the grindstone support base, and the threaded part to the rotation shaft of the nut can be exposed. It consists of a lid cover provided with a window, and a window cover that covers the window so as to be openable and closable, and a slide shaft extending parallel to the rotation axis is supported on the cover body so as to be movable along the axial direction of the slide shaft. A rotary shaft is provided at the end of the lid cover to rotate the lid cover around an axis perpendicular to the axis of the rotary shaft, and a rotary shaft is provided in the lid cover at a position offset from the rotation axis. A hanger pin having an eccentric engagement groove on its outer circumferential surface that can engage with the engagement hole is removably attached.

(2) Operation When removing the grindstone, the rotating shaft is kept horizontal, the hanger pin is inserted into the lid cover and engaged with the engagement hole of the grindstone, the window cover is opened, the nut is loosened, and the lid cover is removed from the cover body while moving the slide shaft. In this state, the grindstone is removed from the rotating shaft and is suspended by the hanger pin.
Furthermore, by rotating the lid cover around the rotating shaft, the grindstone is raised up in a state where it is positioned in front of the worker, and the engagement hole is released from the engagement groove of the hanger pin, and the hanger pin is pulled out from the lid cover. This completes the grindstone removal work, but when installing, the above-mentioned operation can be reversed. In either case, the worker only needs to hold the grindstone in a position that is easy for him to work in, reducing his burden and preventing the grindstone from colliding with the rotating shaft as much as possible.

(3) Example Hereinafter, an example in which the device of the present invention is applied to a tooth grinding machine will be explained with reference to the drawings.
In the figure and Fig. 2, the gear material 1 to be ground is
is supported rotatably around a horizontal axis between a headstock 2 and a tailstock 3, and a metal screw-shaped grindstone 4 for grinding the teeth of the gear blank 1 is supported on a grindstone support 5. This grindstone support stand 5 is supported by a turning table 6 which can be angularly displaced around a horizontal axis perpendicular to the rotational axis of the gear blank 1 so as to be movable along the radial direction of the turning table 6.

A traverse table 8 is disposed on the base 7 so as to be movable along a direction parallel to the axis of rotation of the turning table 6 (a direction perpendicular to the plane of the paper in FIG. 1, a left-right direction in FIG. 2). Also, the traverse table 8
A slide table 9 is placed on top of the gear blank 1 so as to be movable along the axial direction, a headstock 2 is fixedly arranged at one end of the slide table 9, and a headstock 2 is fixedly arranged at the other end of the slide table 9. teeth,
A tailstock 3 is disposed so as to be movable along the longitudinal direction of the sliding base 9.

A first driving means 10 for driving a traverse table 8 is disposed on the base 7, and a second driving means 10 for driving a sliding table 9 is disposed on the traverse table 8.
Drive means 11 are provided. Also, in the headstock 2,
Third driving means 1 for rotationally driving gear material 1
2 is provided.

A support frame 13 is erected on the base 7,
This support frame 13 is provided with a vertical support surface 14 facing the headstock 2 and tailstock 3 side, and the turning table 6 is supported by facing the support surface 14 so that it can be angularly displaced around the horizontal axis. It is supported by a frame 13.
A fourth drive means 15 is provided on the outer surface of the support frame 13 opposite to the support surface 14, and the turning table 6 is driven by the fourth drive means 15 for angular displacement around the horizontal axis. Thereby, during the grinding process, the grindstone support 5 can be tilted from the vertical position shown by the solid line in FIG. 1 to the left and right within the range of angle α as shown by the two-dot chain line.

The turning table 6 includes a disk portion 16 and a disk portion 1.
6 and a support portion 17 extending in the radial direction are integrally provided, and the grindstone support stand 5 is supported by the support portion 17 so as to be movable along the radial direction of the disk portion 16. Furthermore, the support portion 17 is provided with a fifth drive means 18 for driving the grindstone support stand 5.

A screw-shaped grindstone 4 is rotatably arranged at the lower end of the grindstone support 5, and a sixth drive means 2 for rotationally driving the grindstone 4 is provided at the upper part of the grindstone support 5.
A detector 19 for detecting zero and the amount of angular displacement is equipped. Furthermore, the grindstone 4 is a gear material 1
It is covered with a grindstone cover 21 so that only the part facing the grindstone is exposed.

A rotating table 6 is mounted on the support surface 14 of the support frame 13.
An annular T-groove 22 is bored along an imaginary circle centered on the axis of the rotary table 6, and the diameter of the disk portion 16 in the turning table 6 is determined so as to cover the entire circumference of the T-groove 22. Moreover, the disc part 1
6 includes a plurality of, for example, four, T-shaped engaging pieces 23 inserted into the T-groove 22, and a state in which the rotating table 6 is fixed by firmly engaging the engaging pieces 23 with the T-groove 22, and the engagement thereof. Release the T of each engaging piece 23.
A plurality of, e.g., 4
Two clamping means 24 are provided.

In FIGS. 3 and 4, the whetstone support 5 has a rotating shaft 25 which is rotationally driven by the sixth driving means 20.
is rotatably supported by a bearing 26 or the like, and the lower end of this rotating shaft 25 projects from the grindstone support base 5. A whetstone 4 is fixed to the protruding end of the rotating shaft 25, and a whetstone cover 21 is fixed to the lower end of the whetstone support base 5 so as to surround the whetstone 4.

The grindstone 4 includes a cylindrical boss portion 27 and a cylindrical boss portion 27.
Annular plate portion 28 extending radially outward from the outer peripheral surface of
and a cylindrical portion 29 concentrically connected to the outer end of the ring plate portion 28, and is formed into a bowl shape on both sides. A threaded grinding surface 30 is provided on the outer surface of the cylindrical portion 29 for grinding the teeth of the gear blank 1.

A conical insertion hole 31 is provided in the boss portion 27 . On the other hand, a tapered fitting part 33 is integrally provided at the lower end of the rotating shaft 25 via a support step part 32.
The fitting portion 33 is fitted into the insertion hole 31 of the boss portion 27. When one end surface of the boss portion 27 comes into contact with the support step portion 32, the end of the fitting portion 33 touches the boss portion 27.
A large-diameter male threaded portion 34 and a small-diameter male threaded portion 35 are provided at the protruding end thereof. Nuts 36 and 37 are screwed into both male threaded portions 34 and 35, and by tightening these nuts 36 and 37, the boss portion 27 of the grinding wheel 4 is compressed between the support step portion 32 and both nuts 36 and 37. As a result, the grindstone 4 is fixed to the rotating shaft 25.

On the rotating shaft 25 above the fixed position of the grindstone 4,
A seal plate 38 covering one end of the cylindrical portion 29 of the grindstone 4 is fixed by a screw member 39. An annular fitting groove 40 facing one end surface of the cylindrical portion 29 is provided on the outer peripheral edge of the seal plate 38, and an annular sealing member 41 made of an elastic material such as rubber is disposed in the fitting groove 40. Fitted in. This sealing member 41 is provided with a lip 42, which resiliently abuts against one end surface of the cylindrical portion 29.

By covering the upper part of the grinding wheel 4 with the sealing plate 38 and sealing between the sealing plate 38 and the cylindrical part 29 with the sealing member 41 in this way, chips will not enter the cylindrical part 29 and accumulate during the grinding process. is prevented. Therefore, there is no loss of rotational balance of the grindstone 4 caused by accumulation of chips, and machining defects are prevented.

An annular plate 43 facing the seal plate 38 is fixed to the lower end surface of the grindstone support 5.
A labyrinth seal structure 44 is provided between the opposing surfaces of the annular plate 8 and the annular plate 43 by mutual unevenness. Further, the annular plate 43 is provided with a seal member 45 that resiliently slides into contact with the seal plate 38. The labyrinth seal structure 44 and the seal member 45 prevent chips from entering the bearing portion of the rotating shaft 25 through the space between the annular plate 43 and the seal plate 38.

The grindstone cover 21 is arranged to surround the grindstone 4 in order to prevent chips from scattering due to the rotation of the grindstone 4, and includes a cover main body 46 fixed to the grindstone support 5, and a cover main body 46 that is fixed to the grindstone support base 5. It consists of a lid cover 47 that is detachably fixed, and a window cover 48 that is attached to the lid cover 47 so that it can be opened and closed.

The cover main body 46 includes a cylindrical portion 54 having an arc-shaped cross section and surrounding the whetstone 4 and having a notch 53 on the side that can expose a part of the whetstone 4, and a cylindrical portion 54 that is welded to one end of the cylindrical portion 54. A mounting plate portion 56 is fixed to the support base 5 with bolts 55. At the other end of the cylindrical portion 54, a plurality of attachment portions 57 are provided at circumferentially spaced positions, and each of the attachment portions 57 is provided with a screw hole 58.

Referring also to FIG. 5, the lid cover 47 includes:
A hole 59 corresponding to the screw hole 58 of the mounting portion 57 is bored, and the diameter of the hole 59 is set larger than the head of the tightening bolt 60 that is screwed into the screw hole 58. Further, a hook 61 that can be engaged with each tightening bolt 60 is rotatably supported on the lid cover 47. Therefore, tighten the hook 61 and tighten the bolt 60.
The lid cover 47 is fixed to the cover body 46 by tightening the tightening bolt 60 in the engaged state, and when the tightening bolt 60 is loosened to release the engagement state of the hook 61 with the tightening bolt 60, The lid cover 47 can be removed from the cover body 46.

In the center of the lid cover 47, a whetstone 4 is attached to the rotating shaft 25.
A window 62 facing the nuts 36 and 37 for fixing the
This window 62 is covered with a window cover 48. The window cover 48 is formed into a bottomed cylindrical shape having a flange 63 at the open end, and a pair of locking holes 64 are bored in the flange 63 along one diameter thereof. Each locking hole 64 is formed by a large diameter portion 65 and a small diameter portion 66 adjacent to the large diameter portion 65 on one side along the circumferential direction of the collar portion 63 communicating with each other. A locking pin 67 that can be locked is attached to the lid cover 47.
be planted in Each locking pin 67 has a diameter large enough to be inserted into the small diameter portion 66, and has a locking pin at its tip having a diameter larger than the small diameter portion 66 and large enough to be inserted into the large diameter portion 65. A head 68 is provided.

The window cover 48 rotates with the locking pin 67 inserted into the large diameter portion 65 of the locking hole 64, and the locking pin 67
is fixed to the lid cover 47 by positioning it in the small diameter part 66 of the locking hole 64. When removing the window cover 48, rotate the window cover 48 in the opposite direction to the above-mentioned direction.
may be located in the large diameter portion 65.

The cover body 46 is integrally provided with a guide tube portion 69 extending parallel to the rotation shaft 25, and a pair of slide shafts 70 extending parallel to the rotation shaft 25 are attached to the guide tube portion 69 in the axial direction. supported so as to be movable along the A regulating flange 71 is provided at one end of each of these slide shafts 70 on the grindstone support stand 5 side. The other end portion can be moved in a direction away from the cover body 46. Further, the guide cylinder portion 69 has a regulating screw 72 that comes into contact with the outer surface of both slide shafts 70 to regulate their movement.
are fitted so that they can move forward and backward.

A support part 73 is fixed to the other end of both slide shafts 70, and the rotation shaft 2 is fixed to this support part 73.
A rotary shaft 74 perpendicular to the axis of 5 is fixed. Further, a bracket 75 is fixed to the lid cover 47, and this bracket 75 is rotatably supported by a rotation shaft 74 via a bearing 76. Therefore, the lid cover 47 is rotatable around the rotation axis 74 when the lid cover 47 is released from integration with the cover body 46.

A pair of engagement holes 77 are bored in the ring plate portion 28 of the grinding wheel 4 on approximately one diameter line thereof, and a pair of attachment holes 78 are formed in the lid cover 47 corresponding to these engagement holes 77. drilled. Each mounting hole 78 has a cylindrical guide member 80 having a mounting collar 79 on its outer surface.
is inserted, and the guide member 80 is fixed to the lid cover 47 by bolts 81 with the mounting collar 79 in contact with the lid cover 47.

An insertion hole 82 is provided in the guide member 80 over the entire length, and the center C1 of this insertion hole 82 is
The grinding wheel 4 is eccentrically offset by a distance δ from the center C2 of the engagement hole 77 in the direction away from the slide shaft 70. Also, the mounting collar 7 in the guide member 80
A screw member 83 that protrudes into the insertion hole 82 is screwed into the portion of the slide shaft 70 side of the slide shaft 9 .

A hanger pin 84 for hanging the grindstone 4 by engaging with the engagement hole 77 of the grindstone 4 is inserted into the insertion hole 82 of the guide member 80 . As shown in FIG. 6, the hanger pin 84 has a small-diameter shaft portion 86 concentrically connected to one end of a large-diameter shaft portion 85 that is large enough to be inserted into the insertion hole 82 . Moreover, an eccentric circular protrusion 87 is provided in the middle of the small diameter shaft part 86, and an eccentric engagement groove 88 is formed between this circular protrusion 87 and the end of the large diameter shaft part 85. . The width of this engagement groove 88, that is, the end of the large diameter shaft portion 85 and the circular protrusion 87
The distance between the two is set to be slightly larger than the thickness of the ring plate portion 28 of the grindstone 4.

In the hanger pin 84 , a linear guide groove 89 extending in the axial direction from the circular protrusion 87 to the middle of the large diameter shaft part 85 is provided on the eccentric side surface of the circular protrusion 87 . An arcuate guide groove 90 is provided which extends in an arc shape over a range of 180 degrees from the end of the linear guide groove 89. The ends of the screw member 83 can be fitted into these guide grooves 89 and 90.

Referring again to FIGS. 1 and 2, a cover 50 is provided on the base 7 to cover most of the traverse table 8, sliding table 9, headstock 2, tailstock 3, and turning table 6. Parts of the whetstone support stand 5 and the support part 17 of the turning table 6 protrude from the upper part of the cover 50, and the whetstone support stand 5 and the support part 17 have their upper ends protruding upward. Cylindrical cover 5 with a square cross section
Covered by 1. Further, the upper part of the cover 51 is covered with a bellows-shaped cover 52 so as to follow the tilting movement of the grindstone support stand 5 and the support section 17.

Next, the operation of this embodiment will be explained. When removing the grindstone 4, the turning table 6 is rotated so that the slide shaft 70 is in the lower position and the rotating shaft 25 is made horizontal. Next, the hanger pin 84 is inserted into the insertion hole 82, but since the screw member 83 is located at the lower part of the guide member 80, the hanger pin 84 is inserted into the insertion hole 8 with the linear guide groove 89 facing downward.
2 is inserted. As a result, the screw member 83 fits into the linear guide groove 89, and when the screw member 83 abuts the end of the linear guide groove 89, the engagement groove 88
is located at a position corresponding to the engagement hole 77 of the grindstone 4. Therefore, when the hanger pin 84 is rotated 180 degrees with the arc-shaped guide groove 90 along the screw member 83, the engagement groove 8
8 engages with the engagement hole 77 of the grindstone 4.

Next, remove the window cover 48 from the lid cover 47, loosen the tightening bolts 60, and remove the hooks 61.
, so that the lid cover 47 can be removed from the cover body 46. In this state, the rotating shaft 25
Remove the nuts 36 and 37 from the
Make it possible to draw from 5. Thereafter, when the lid cover 47 is pulled out while moving the slide shaft 70 within the guide tube 69, the grindstone 4 is moved to both hanger pins 8.
4 is pulled out together with the lid cover 47 and removed from the rotating shaft 25. Lid cover 47
With the lid cover 74 pulled out from the base 7 close to the worker, place the lid cover 74 around the rotation shaft 74 at a 180° angle.
When the grindstone 4 is rotated by one degree, the grindstone 4 will be located right in front of the operator. Therefore, the engagement hole 77 is connected to the engagement groove 8.
What is necessary is to remove the grindstone 4 from the hanger pin 84 by lifting the grindstone 4 by the amount that it separates from the hanger pin 84.

In this way, the grindstone 4 is pulled out close to the worker located outside the base 7, and the worker can remove the grindstone 4 in a comfortable posture. Moreover, whetstone 4
When the grinding wheel 4 is removed from the rotating shaft 25, the grinding wheel 4 is suspended by the hanger pin 84, so there is no interference between the grinding wheel 4 and the male threaded portions 34, 35 of the rotating shaft 25, and no special protective equipment is required. In either case, the grindstone 4 and the rotating shaft 25 are not damaged.

To attach the grinding wheel 4 to the rotating shaft 25, the above-mentioned removal operation can be performed in reverse order, and at this time, the operator can easily perform the attachment operation from outside the base 7. I can do it.

C. Effect of the invention As described above, according to the invention, the grinding wheel cover is
A cover body that has a notch on the side that can expose the whetstone and has an arc-shaped cross section that surrounds the whetstone and is fixed to a whetstone support stand, and the cover body is opposite to the whetstone support stand. It consists of a lid cover that is removably fixed to the side end and has a window that allows the threaded part of the nut to be exposed, and a window cover that covers the window so that it can be opened and closed. A slide shaft extending parallel to the rotation shaft is supported so as to be movable along its axial direction, and a slide shaft is provided at an end of the slide shaft to rotate the lid cover around an axis perpendicular to the axis of the rotation shaft. A moving shaft is provided, and a hanger pin is removably inserted into the lid cover, and the hanger pin is eccentrically provided on the outer peripheral surface of the lid cover and has an engagement groove capable of engaging with an engagement hole formed in the grindstone at a position offset from the rotation axis. Since it is attached to the machine, the grindstone suspended from the hanger pin can be pulled out together with the lid cover close to the worker, and then the lid cover can be rotated around the rotation axis to face the grindstone towards the worker. This allows the worker to attach and detach the grindstone in a comfortable posture, and also reduces the burden on the operator. Further, since the grindstone is inserted into and removed from the rotating shaft while being suspended from the hanger pin, damage to the grinding stone and the rotating shaft can be prevented without using special protective equipment.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a longitudinal sectional front view of a tooth grinding machine, and Fig. 2 is a view taken from - of Fig. 1.
The line view, Figure 3 is an enlarged vertical sectional view of the main part, and Figure 4
FIG. 4 is a sectional view taken along the - line in FIG. 3, FIG. 5 is a sectional view taken along the - line in FIG. 4, and FIG. 6 is an enlarged perspective view of the hanger pin. 4...Whetstone, 5...Whetstone support stand, 21...Whetstone cover, 25...Rotary shaft, 36, 37...Nut, 46...Cover body, 47...Lid cover, 4
8... Window cover, 53... Notch, 54... Cylindrical part, 62... Window, 70... Slide shaft, 74...
Rotation shaft, 77...Engagement hole, 84...Hanger pin,
88...Engagement groove.

Claims (1)

[Scope of utility model registration request] In a grindstone attachment/removal auxiliary device that is screwed and fixed with a nut to the end of a rotating shaft rotatably supported by a grindstone support base, and is surrounded by a grindstone cover with a part exposed, the grindstone cover exposes the grindstone. a cover body that is fixed to the whetstone support base and has a cylindrical part with an arcuate cross section that surrounds the whetstone and has a notch part on the side thereof, and a cover body on the side opposite to the whetstone support base of the cover body; It consists of a lid cover that is removably fixed to an end portion and has a window that allows the threaded part of the nut to be exposed, and a window cover that covers the window so that it can be opened and closed, and the cover body includes: A slide shaft extending parallel to the rotation shaft is supported so as to be movable along its axial direction, and a slide shaft is provided at the end of the slide shaft to rotate the lid cover around an axis perpendicular to the axis of the rotation shaft. A moving shaft is provided, and a hanger pin is removably inserted into the lid cover, and the hanger pin is eccentrically provided on the outer circumferential surface of the lid cover and has an engagement groove capable of engaging with an engagement hole formed in the grindstone at a position offset from the rotation axis. A grindstone attachment/detaching assist device characterized by being attached to.