JPS6121776B2 - - Google Patents

Description

[Detailed description of the invention] FIELD OF THE INVENTION The present invention relates to a tap fitting.

U.S. Patent No. 1 for tap fittings
No. 3002206, No. 3041893, No. 3397588, No. 3717892,
No. 3791756 is known.

SUMMARY OF THE INVENTION It is a primary object of the present invention to provide a tap mount that includes a torque release clutch device that releases the clutch in response to excessive torque in either forward or reverse drive.

According to the present invention, a main body member rotatable about its axis; a tap spindle mounted on the main body member rotatably about the axis;
A tap mount including a device that provides forward rotational drive in one direction or reverse rotational drive in the other direction to the tap spindle, wherein the device that provides the drive includes a torque release clutch device and an output of the torque release clutch device. A sleeve portion that is integrally connected to the member and constitutes an input member of a device that provides forward rotation drive, and a skirt portion that is integrally connected to the sleeve portion and constitutes an input member of a device that provides reverse rotation drive. A tap fitting is provided.

This configuration makes the tap mount extremely compact.

According to the present invention, the torque can be easily and reliably released and engaged in both normal rotation drive and reverse rotation drive.

The present invention makes it possible to drive the spindle in a tap fixture substantially without friction. The torque release clutch device is of the type that provides the driving force via a ball carried in a spring biased sleeve. The ball engages an axial spline groove, preferably a single sleeve acting as a ball holder is carried on the resilient spindle, the ball drivingly engaging the splines of the clutch drive member and the splines of the spindle.

A ball carrier with a ball drive member is arranged between the rotary member cooperating with the spline, the ball carrier being elastically biased in the axial direction.

The above and other objects and advantages of the present invention will become apparent from the following detailed description and accompanying drawings.

In FIG. 1, an arbor 11 of a machine tool 10 is fitted with a tap fitting 12 according to the invention. A radial retaining arm 13 of the fixture 12 engages a stop bar 14 mounted on the machine tool 10 to prevent rotation of the body of the fixture 12. Tap 20 on the chuck 16 at the lower end of the spindle 18 of the fixture 12.
is installed. The chuck 16 includes a nut 17.

In FIG. 2, the fixture 12 has a cylindrical body 19 to which the radial retaining arm 13 is fixed by screws 25, 25'. Inside the cylindrical body 19, a component 23 is rotatably mounted via ball bearings 26, 26'.
is supported and the part 23 is driven by the arbor 11 through the tapered hole 24. Ring 21 positions ball bearings 26, 26'.

The lower end 30 of the part 23 has large diameter, angularly spaced axial holes 31, 31', each having a ball 38, 38' urged downwardly by a spring 32, 32'. Positioned. spring 32,
The upper end of 32' is in contact with the annular plate 33, and the annular plate 33
is supported by the adjustment collar 34 via a ball 37. Ball 37 is positioned by retainer plate 36.

These parts constitute an adjustable torque release clutch device in which the spring force acting on the balls 38, 38' can be adjusted by rotating the collar 34. Ring 41 can be moved to allow a tool to be inserted through aperture 40 into apertures 42, 42' to rotate collar 34.

A sleeve 44 is integrally connected to the output member 39 of the clutch for forward and reverse rotation. The sleeve 44 is cylindrical and has a hole 45. The hole 45 has a spline 100a, as described later.
100b and 100c are provided and constitute an input member of the normal rotation drive device.

The sleeve 44 has a square shoulder 51 which engages a corresponding hole in the clutch plate ring 39. The torque release clutch acts between the part 23 and the clutch plate ring 39.

Sleeve 44 is rotationally supported by ball bearing 52 . The plate ring 39 and the ball bearing 52 are connected to the retaining rings 53 and 5.
4.

The spindle 18 is cylindrical and has an end hole 7.
It has 7. Fitted into hole 77 is a bushing 78 having a central hole 79 and a large diameter upper end 80 with a spring retaining flange 80. Butsuyu 7
A counterbore hole 82 is provided in the upper surface of the holder 8 . A suspension bar 83 is attached to a hole 84 in part 23 and extends downwardly through a hole 79 in bushing 78. A coil spring 85 acts between the counterbore 83 and the counterbore 86 of the part 23 and surrounds the rod 83.

Spindle 18 has a main bore 87 into which rod 83 extends. A coil spring 88 surrounds the rod 83 within the hole 87 and acts between a washer 91 fixed to the lower end of the rod 83 by a screw 90 and a hole 92 in the lower surface of the bush 78, forcing the spindle 18 upward. push towards.

The center hole 45 of the sleeve 44 includes circumferentially spaced splines 100a, 100b, 10.
0c is provided as an axially shaped portion, and the spline is formed by connecting balls 112, 113,
114 in driving engagement. (Figure 2, Figure 3, Figure 5
(see figure).

The balls 112, 113, 114 are positioned and held by a ball supporting member, ie, a sleeve 102, for forward and reverse rotation driving.

The sleeve 102 has a cylindrical shape and is attached to the spindle 1.
8 and is pressed from above and below by springs 103 and 104 which abut against the flange 81 of the bush 78 and the shoulder 106 of the spindle 18, respectively.

The splines 100a, 100b, 100c have arcuate side surfaces corresponding to the balls 112, 113, 114, and their lower ends are also arcuate. Ball 1
12, 113, and 114 are accommodated and positioned in the ball receiving holes 109, 110, and 111 of the sleeve 102, respectively. The balls 112, 113, 114 are in the axial grooves 115, 116 and 11 of the spindle 18.
7, respectively confined within the axial profile.

A reversing drive gear 119 is provided on the reversing clutch sleeve 118. The lower end of the reversing clutch sleeve 118 is supported on a thrust washer 124. The reversing clutch sleeve 118 is surrounded by a skirt portion 46 which is integrally connected to the sleeve 44 and constitutes an input member for the reversing drive, and lies within the bore of the planetary gear carrier 120.
The planetary gear carrier 120 has a large diameter portion 121 that fits over the end of the cylinder 19 and is fixed to the cylinder 19 by a key 126 . Planetary gear carrier 12
0 has openings 142a, 142b, 142c into which three planetary gears 143, 144, 145 are inserted. The reversing drive gear 119 of the reversing clutch sleeve 118 is driven in the opposite direction by a planetary gear mechanism. The driven spindle 18 is supported by a bearing 1 supported on the small diameter lower end 123 of the planetary gear carrier 120.
It is supported by 25. Each planetary gear 143, 14
4, 145 are supported by pins 150a, 150b, 150c attached to the planetary gear carrier 120 and rotate within the openings 142a, 142b, 142c, and the gear 119 and the skirt portion 46 of the sleeve 44
It meshes with a gear 156 provided on the inner surface of. Second
The figure shows that the pin 150a is fixed in a hole 151 provided in the planetary gear carrier 120. Reversing clutch sleeve 118 rotates supported by bearings 155 made of a suitable bearing material such as oil immersed bronze. Skirt portion 46 of sleeve 44
There is a seat bar 160 below the seat plate 160, which is normally spaced apart from the skirt portion 46 as shown in FIG. A retaining ring 161 is provided to retain the planetary gear carrier 120 within the cylinder 19.

Center hole 169 of reverse clutch sleeve 118
The splines 100a, 10 of the sleeve 44 are
Spline 170 almost similar to 0b, 100c
a, 170b, and 170c are provided. (See Figure 4).

The chuck 16 is of a normal structure and has a cylindrical shape, and has a hole 18 having tap holding jaws 181 and 182.
It has 0. Jaws 181 and 182 are threaded rods 18
Driven by 4. Also, the hole 8 of the spindle 18
The lower end of 7 is formed with a hole 186 that opens outward and slopes as shown. An expandable and collapsible collet 188 is housed in the hole 186;
Collet 188 accommodates and holds tap 20. A screw 190 is provided at the lower end of the spindle 18 and is screwed into the nut 17. Natsu 17 and Collets 1
There is a zagane 196 between it and 88.

The spindle 18 has a limited axial free-floating characteristic as described above, and moves up and down according to the lead of the tap itself. If desired, the arbor 11 of the machine 10 is moved to follow the movement of the spindle 18.

When the tap begins to cut a thread during operation, the tap moves forward (downward) with the spindle 18 relative to the housing or cylinder 19. When the thread is cut to the desired depth, the forward rotation and reverse rotation are switched as follows. As the spindle 18 moves downward, the balls 112, 113, 114
moves downward in FIG. 2 with the ball carrier 102 and downward relative to the groove on the spindle 18. Since the ball can also rotate when moving axially, drive is transmitted substantially without friction. When the balls reach the lower ends of the splines 100a, 100b, 100c, the engagement between the splines and the balls is released without friction or play. Spring 103 is compressed as the ball engages the spline and moves downward. This is because the downward momentum of the ball is smaller than the downward momentum of the spindle 18 (for example, about 2/1). Spring 103 assists in this movement when the ball reaches the lower end of the spline and is released.

Due to the downward movement of the balls and ball holder 102 by the spring 103, the balls 112, 113, 114 engage with the splines 170a, 170b, 170c, and reverse rotation is started. In addition, the ball is spline 10
0a, 100b, 100c and the driving force is no longer transmitted to the spindle, the spindle stops and the ball moves to the spline 170a,
When engaged with 170b and 170c, reverse rotation of the spindle is started.

Note that the aforementioned splines 100a, 100b, 10
When released from 0c and spline 170
a, 170b, 170c, the ball moves downwardly relative to the spindle 18 and no relative axial movement between the spindle 18 and the cylinder 19 occurs. The spring 104 is connected to splines 170a, 170b, 170 when converting from reverse rotation drive to normal rotation drive.
splines 100a,
100b, 100c.

When an excessive load is applied, the torque release clutch is released. This works both during forward rotation drive and reverse rotation drive.

FIG. 6, FIG. 7, and FIG. 8 show modified examples. 1st
Parts corresponding to those in Figures 5-5 are designated with the same reference numerals.

The structures shown in FIGS. 6 to 8 differ in the following points. Rather than using a common ball and a single ball carrier for both forward and reverse drives, separate ball carriers are provided for forward and reverse drives. In the first embodiment, the ball carrier is carried on the spindle 18, but in a variant the ball carrier is not carried on the spindle, although it is concentric with the spindle.

Splines 200a, 200b, 20 are shown in FIG.
A spindle 18' is shown having a 0c. 6th
In FIGS. 7 and 7, the upper ball carrier 202 has a sleeve-like shape with a flange 204 and a ball 208.
Opening 206 housing a, 208b, 208c
a, 206b, and 206c. ball 208
a, 208b, 208c are splines 200a,
200b and 200c. Ball carrier 202
is biased by a spring 210 acting between flange 204 and shoulder 212 of sleeve 44.

The operation of the ball carrier 202 is the same as in the first embodiment. As spindle 18 moves relatively downward, the ball moves downwardly along the splines of sleeve 44 and spring 210 is compressed. Thus, when the ball is released from the spindle of spindle 18 by a predetermined downward movement, spring 210 allows for rapid release.

A ball carrier 220 for reverse rotation driving is provided separately from the ball carrier 210. Ball carrier 220 is cylindrical and has a ball receiving opening similar to ball carrier 102 described above. Ball carrier 220 holds a ball that is positioned in the splines or axial grooves of reversing clutch sleeve 118. Ball carrier 220
is biased upwardly by spring 222 acting between shoulder 224 of bearing 226.

The operation in reverse rotation drive and the conversion from reverse rotation drive to forward rotation drive are almost the same as in the first embodiment. Spring 222 facilitates the transition from reverse drive to forward drive.

From what has been described above, those skilled in the art will readily understand the nature of the invention and its operation and conversion in both forward and reverse drives.

In both embodiments of the invention, a torque release clutch operates on the drive clutch member through which forward and reverse rotational drive is transmitted. Therefore,
In either case of forward rotation drive or reverse rotation drive, if an excessive load is applied, the torque release clutch is activated and the torque is released.

The embodiments described above are illustrative rather than restrictive, and the invention is limited by the scope of the claims.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a tap mount according to the invention shown mounted on a machine tool. FIG. 2 is a sectional view of the tap fitting shown in FIG. 1. FIG. 3 is a cross-sectional view taken along line 3-3 of FIG. Figure 4 shows the line 4- in Figure 2.
4 is a cross-sectional view along line 4. FIG. 5 is a perspective view of the ball carrier.
FIG. 6 is a partial sectional view showing a modification of FIG. 2.
FIG. 7 is a cross-sectional view of the spindle portion of FIG. 6. FIG. 8 is a perspective view of the spindle portion of FIGS. 6 and 7. 11: Arbor, 12: Tap fitting, 39: Plate ring, 44: Clutch sleeve, 52: Ball bearing, 8
3: Suspension rod, 88: Coil spring (on the periphery of rod 83), 100a, 100b, 100c: Spline, 115, 116, 117: Spindle 18
Groove inside, 119: Clutch sleeve for reverse drive.

Claims (1)

[Scope of Claims] 1. A main body member that is rotated around its axis, a tap spindle mounted on the main body member so as to be rotatable around the axis, and a tap spindle that is driven to rotate in one direction in the normal direction. and a device for providing reverse drive in the other direction, wherein the device for providing drive is integrally coupled to a torque release clutch device and an output member of the torque release clutch device to provide forward rotation drive. 1. A tap mount comprising a sleeve portion constituting an input member of a device for providing reverse rotation, and a skirt portion integrally connected to the sleeve portion and constituting an input member of a device for providing reverse drive.