JP2000061729A - Tapper mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent lowering of tap hole forming precision by absorbing and relaxing impact force of a clutch member at the time when the clutch member is engaged with a clutch for reverse rotation. SOLUTION: A clutch 3 for reverse rotation is connected to a drive shaft through a connecting member 6 so as to freely rotate integrally with the drive shaft but to freely move in the axial direction relative to the drive shaft and the connecting member 6 is installed on the clutch 3 for reverse rotation free to slightly displace in the peripheral direction through an elastic member 7 on a tapper mechanism constituted by providing a clutch 2 for normal rotation and the clutch 3 for reverse rotation on the drive shaft to be rotationally driven and the clutch member 5 to be engaged with the clutches 2, 3 for normal rotation and reverse rotation on a driven shaft 4 with a tap T installed on its head end part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tapper mechanism used when threading, that is, tapping, a metal workpiece.

[0002]

2. Description of the Related Art As a conventional technique of this type of tapper mechanism, there is one disclosed in Japanese Utility Model Laid-Open No. 7-27725 by the same applicant as this application. This is because the forward rotation clutch provided on the drive shaft that is rotationally driven by the main shaft of the machine tool is engaged with the clutch member attached to the driven shaft that has a tap at the tip to rotate the drive shaft. When the clutch member is transmitted to the driven shaft and moves by a predetermined stroke, the clutch member is disengaged from the forward rotation clutch, the transmission force from the driving shaft is shut off, and the driven shaft is switched to a neutral state. In the mechanism, a ball rolling groove is formed on a surface of the clutch member facing the driven shaft to which the clutch member is mounted, the ball rolling groove allowing the ball to roll only in the axial direction. The clutch member and the driven shaft are engaged with the rotational force transmitting ball to rotate integrally therewith, and the engaging piece and the driven shaft are guided by the rotational force transmitting ball and relatively moved. On the axis You can move in the direction, and further comprising providing a clutch spring that presses in a direction to leave the said clutch member from the forward rotation clutch.

However, in the above tapper mechanism,
When the clutch member is disengaged from the forward rotation clutch due to the engagement between the clutch member and the forward rotation clutch, the rotational force transmitting ball is inserted in the ball rolling groove formed on the surface facing the clutch member and the driven shaft. The clutch member can be moved very lightly from the driven shaft in the axial direction by rolling of the torque transmitting ball, and the clutch member is moved in the direction of disengagement from the forward rotation clutch by the clutch spring. Since it is biased, when the clutch member disengages from the forward rotation clutch, the clutch member does not instantly separate from the forward rotation clutch for a sufficient distance to come into contact with the forward rotation clutch again. It is possible to prevent the so-called chattering phenomenon from occurring in which engagement and disengagement of the member and the forward rotation clutch are repeated.

[0004]

However, in the conventional tapper mechanism as described above, the clutch member is disengaged from the forward rotation clutch and is in a neutral state, and the reverse rotation or auxiliary clutch facing the forward rotation clutch is engaged. At the time of fitting, these reverse clutches receive a strong impact,
A new problem has been found that the impact force causes damage such as damage to the clutch member or the clutch for reverse rotation, which lowers the processing accuracy. The present invention aims to solve such problems.

[0005]

In order to achieve the above object, in the invention according to claim 1, the forward rotation clutch 2 is attached to the drive shaft 1 which is rotationally driven, as indicated by the reference numerals shown in the drawings. And a reverse rotation clutch 3 are provided, and a clutch member 5 is provided on a driven shaft 4 having a tap T attached to the tip thereof. The clutch member 5 engages with the forward rotation clutch 2 so that the driven shaft 4 has a predetermined shape. After the clutch member 5 is disengaged from the forward rotation clutch 2 and switched to the neutral state by moving in the stroke axis direction, the clutch member 5 is engaged with the reverse rotation clutch 3 so that the driven shaft 4 is reversely rotated. In the tapper mechanism that is adapted to be driven, the reverse rotation clutch 3 rotates integrally with the drive shaft 1, but the drive shaft 1 is movable via the connecting member 6 so as to be movable in the axial direction with respect to the drive shaft 1. Connected to 1 Both the connecting member 6 is made of a slightly displaced capable mounted becomes a configuration in the circumferential direction via the elastic member 7 in the reverse rotation clutch 3.

According to the second aspect of the invention, the forward rotation clutch 2 and the auxiliary clutch 3 are provided on the drive shaft 1 which is rotationally driven.
Is provided and a clutch member 5 is provided on the driven shaft 4 having a tap T attached to the tip thereof. The clutch member 5 engages with the forward rotation clutch 2 to move the driven shaft 4 in a predetermined stroke axial direction. Then, the clutch member 5 is engaged with the auxiliary clutch 3 corresponding to the forward rotation clutch 2 by rotating the drive shaft 1 in the reverse direction with the clutch member 5 disengaged from the forward rotation clutch 2 and switched to neutral. In the tapper mechanism in which the driven shaft 4 is driven to rotate in the reverse direction, the auxiliary clutch 3 rotates integrally with the drive shaft 1, but is connected to the drive shaft 1 so as to be movable in the axial direction. The connecting member 6 is connected to the drive shaft 1 via a member 6, and the connecting member 6 is attached to the auxiliary clutch 3 via an elastic member 7 so as to be slightly displaceable in the circumferential direction.

In the invention according to claim 3, the drive shaft 1, as shown in FIG. 2, is provided with a first member 1a on the side that receives a rotational force from the main shaft of the machine tool and a forward rotation clutch 2. And the second member 1b on the side where the two members 1 are formed.
The structure according to claim 1 or 2, wherein a and 1b are integrally rotatably connected via an elastic member 8 so that the second member 1b can be slightly displaced in the circumferential direction with respect to the first member 1a. It consists of

In the invention according to claim 4, the clutch member 5 is held by a clutch member holding ring 9 made of a rigid body which is fitted onto the driven shaft 4 so as to be rotatable and axially movable. Between the retaining ring 9 and the driven shaft 4, a rotational force transmitting ball 10 for transmitting the rotational force of the drive shaft 1 to the driven shaft 4 via the clutch member 5 and the retaining ring 9 is provided. The rotational force transmitting ball 10 is movably interposed only in the direction, and the ball receiving member 11 is made of a rigid body.
Is prevented from rotating relative to the driven shaft 4 by
The elastic member 12 provided on the ball receiver 11 is capable of slightly shifting in the rotational direction of the driven shaft 4, and has the structure according to any one of claims 1 to 3.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1 showing the entire tapper mechanism according to the present invention, reference numeral 1 is a drive shaft, and a shank portion 47 fitted and fixed to a main shaft S is concentrically connected to a base end portion thereof. The shank portion 47 is provided with a flange portion 50 that is gripped by the manipulator. As shown in FIGS. 2 and 3, the drive shaft 1 includes a first member 1a on the side that receives a rotational force from the main shaft S (FIG. 1) of the machine tool and a second member on the side on which the forward rotation clutch 2 is provided. 1b and the first member 1a and the second member 1b are connected to each other by the connecting pin 8a and the ring-shaped elastic member 8, and the elastic member 8 causes the second member 1b to be separated from the first member 1a. It is formed so as to be slightly elastic in the circumferential direction. By forming in this way, when the clutch member 5 is engaged with the forward rotation clutch 2 from the neutral state, the impact force of the clutch member 5 is the first member 1a or the second member 1b.
Even when it is applied, the impact force is absorbed and relaxed by the elastic member 8 and can be prevented from propagating to the tap T side and the machine tool side.

The drive shaft 1 is formed in a hollow shape, and a driven shaft 4 is axially slidably and rotatably mounted inside the drive shaft 1, and the base end of the driven shaft 4 is mounted. The side shaft portion 4a is fitted in the shaft insertion hole 14 of the drive shaft 1, and the inner portion of the shaft insertion hole 14 absorbs an error in the axial feed between the machine tool side and the tap T side. A spring 15 (compression spring) is provided, and the driven shaft side spring bearing 16 of the absorption spring 15 is brought into contact with the projecting end of the base end side shaft portion 4 a of the driven shaft 4 so that the tip end portion of the driven shaft 4 is brought into contact therewith. Is attached with a tap T via a tap holder 17.

Reference numeral 18 is a tapper main body, which is supported in a non-rotating state by a stopper pin mechanism 21 having a stopper pin 20 which is engaged with a fixing member 19 of a machine tool, and a bearing 22 rotatably supports the drive shaft 1.

With reference to FIGS. 1 to 6, a clutch member holding ring 9 made of a rigid body (metal) is provided on the base end side of the driven shaft 4 so that it can be slightly swung in the circumferential direction as will be described later. A plurality of ball-shaped clutch members 5 are externally fitted to the clutch member holding ring 9 at regular intervals in the circumferential direction (for example, 120 ° intervals as shown in FIG. 4) and the shaft. Each of them is held in a fixed position in two rows (FIGS. 1 and 2). Between the clutch member holding ring 9 and the driven shaft 4, a plurality of torque transmitting members for transmitting the rotational force of the drive shaft 1 to the driven shaft 4 via the clutch member 5 and the clutch member holding ring 9. A ball 10 is provided so as to be rollable only in the axial direction.

As shown in FIG. 5, the rotational force transmitting ball 10 has an axially extending ball rolling groove 23 into which the driven ball 4 is fitted so that the ball 10 can roll in the axial direction. A ball receiver 11 is provided, and as shown in FIG. 6, an elastic member 12 made of natural rubber or urethane rubber is circumferentially sandwiched between the driven shaft 4 and the ball receiver 11 as shown in FIG. The interposition of the rotational force transmitting balls 10 allows the rotational force transmitting balls 10 to be slightly displaced in the circumferential direction by the elastic action of the elastic member 12, whereby a circumferential impact applied to the rotational force transmitting balls 10 can be prevented. Ball catch 11
It is designed to be absorbed by the elastic members 12 which face each other with the pinch in between.

As shown in FIGS. 1 and 2, the driven shaft 4 is mounted on the end wall 24 at the tip of the tapper body 18 through a bearing 25.
Is rotatably supported, and the sliding ring 26 provided on the end wall 24 and the snap ring 2 that is axially movable and is attached to the driven shaft 4.
A return spring 29 for returning the driven shaft 4 to the base end side is interposed between the spring receiver 28 and the spring receiver 28 which is locked by 7. The spring receiver 28 contacts the tip of the clutch member holding ring 9. To be done. The spring force of the return spring 29 is the absorption spring 1
Weaker than 5. In addition, the rear end of the clutch member holding ring 9 and the spring bearing 31 that is locked to the driven shaft 4 by the retaining ring 30.
A buffer spring 32 having a spring force weaker than that of the return spring 29 is interposed between and.

On the other hand, as shown in FIG. 1, particularly FIG. 2, the second member 1b of the forward part of the drive shaft 1, that is, the forward rotation part a composed of a first member 1a and a second member 1b which will be described later in detail. Is provided with a forward rotation clutch 2 with which a clutch member 5 on the left side in the drawing is engaged in a line contact state, and a rear side of the drive shaft 1, more specifically, a drive shaft reverse rotation part b described later, will be described later. A reverse rotation clutch 3 is provided through which the right clutch member 5 in the figure engages in a line contact state via the reverse rotation mechanism 33, and each clutch member 5 is engaged between the two clutches 2, 3. A neutral space portion 34 that does not fit is provided. That is, drive shaft 1
Is composed of a forward rotation part a that rotates in the forward rotation direction, and a backward rotation part b that constantly rotates in the reverse rotation direction with respect to the forward rotation part a via the reverse rotation mechanism 33. The diversion clutch 2 rotates integrally with the drive shaft forward rotation part a, and the drive shaft reverse rotation part b rotates integrally with the reverse rotation clutch 3.

A reversing bevel gear 35 is axially supported by a support shaft 35a in the tapper body 18 at right angles to the axial direction of the driven shaft 4, and a pair of large gears 36 are provided so as to sandwich the reversing bevel gear 35 from the front and rear. , 37 are provided so as to face each other, and both gears 3
6, 37 are meshed with the reversing bevel gear 35, and the reversing mechanism 3 is formed by the reversing bevel gear 35 and the large gears 36, 37.
3 are configured. In this case, the one large gear 36 is integrally provided on the forward rotation part a of the drive shaft 1, specifically, on the first member 1a thereof, and is connected to this through the connecting pin 13 and the elastic member 8 as described above. The second member 1b has a forward rotation clutch 2
Are integrally provided as described above. Further, the other large gear 37 is provided integrally with the drive shaft reversing portion b, and the drive shaft reversing portion b is connected to the reversing clutch 3 separately by a connecting structure described later. By this reversing mechanism 33, the drive shaft normal rotation part a, and hence the drive shaft reverse rotation part b, and hence the reverse rotation clutch 3 are always rotated in the reverse direction with respect to the rotation direction of the normal rotation clutch 2.

The drive shaft reversing portion b and the reversing clutch 3
Are connected by a slide connecting member 6 composed of a key groove and a key member engaged with the key groove. The reverse rotation clutch 3 rotates integrally with the drive shaft reverse rotation part b, but with respect to the reverse rotation part b. It is slidable in the axial direction. A buffer spring 38 is interposed between the reverse rotation clutch 3 and the sliding contact ring 26 provided on the end wall 24. The buffer spring 38 causes the reverse rotation clutch 3 to move in the axial direction. Are always energized.

Further, as a feature of the present invention,
As shown in FIGS. 1 and 2, and particularly in FIG. 7, a pair of annular recessed portions 29 are provided at symmetrical positions in the outer circumferential direction of the annular reversing clutch 3, and a ring-shaped elastic member made of natural rubber, urethane rubber or the like is provided therein. 7 is fitted, and the connecting pin 13 is penetrated and held across the connecting member (key member) 6 fitted in the key groove 6a provided in the reverse rotation part b of the drive shaft 1 and the elastic member 7 of the reverse rotation clutch 3. Then, the key member 6 includes the connecting pin 13 and the elastic member 7.
It is attached to the reverse rotation clutch 3 via the so as to be slightly displaceable in the circumferential direction.

That is, the reversing clutch 3 is axially movable with respect to the drive shaft reversing portion b by means of a connecting member (key member) 6 provided at symmetrical positions in the circumferential direction, and is integral with the driving portion reversing portion b. Although it is designed to rotate, the connecting member (key member) 6 must be attached to the reversing clutch 3 extremely accurately over the symmetrical position in the circumferential direction and the axial position for smooth operation thereof. However, in this respect, according to the present invention, the elastic member 7 is interposed between the connecting member 6 and the reverse clutch 3 as described above, and the connecting member 6 is slightly circumferentially separated from the reverse clutch 3. The elastic member 7 can absorb the error even if the connection state of the connecting member 6 and the reverse rotation clutch 3 has a slight error in the circumferential direction or the axial direction. Made only that There is an advantage in terms of production that is easy.

As shown in FIG. 1, the tapper mechanism is provided with a stopper pin mechanism 21 having a stopper pin 20 for holding the tapper main body 18 in a non-rotating state with respect to the fixing member 19 of the machine tool. An oil supply mechanism 40 that supplies cutting oil for cooling or lubrication to the tap 7 by using the stopper pin mechanism 21 is provided.

The stopper pin mechanism 21 and the oil supply mechanism 40 will be described. A pin holder 41 is attached to the base end side of the drive shaft 1 in parallel with the driven shaft 4, and a hollow stopper pin is attached to the pin holder 41. 20 is biased in the protruding direction by a spring 42 provided in the inner back portion of the pin holder 41. A spherical body 44 and a coil spring 45, which form a check valve, are provided at the protruding end of the oil passage 43 in the stopper pin 20. This stopper pin 2
An anti-rotation member 46 is integrally attached to the pin 0. The anti-rotation member 46 is movable in the axial direction of the pin 20 with respect to the pin holder 41, and the stopper pin 20 is biased by the spring 45. With this, the free end portion of the detent member 46 is fitted to the detent ring 48 attached to the shank portion 47 in the non-use state, so that the shank portion 47 and The tapper body 18 is coupled to the tapper body 18 so as not to rotate relative to each other. An oil supply nozzle 49 extending toward the tap side is attached to the tip of the hollow pin holder 41.

A usage mode of the tapper mechanism having the above-described structure will be described.

First, when using the tapper mechanism, the flange portion 50 shown in FIG. 1 is gripped by a manipulator, the shank portion 47 is attached to the spindle S of the machine tool, and the drive shaft 1 is rotated by rotationally driving the spindle S ( Forward rotation). At the same time, the stopper pin 2 of the stopper pin mechanism 21
0 is fitted to the fixed member 19, the detent member 46 is disengaged from the detent member 48, the drive shaft 1 is rotatably supported by the hopper body 18 held in a non-rotation state, and the stopper pin mechanism 21 is attached. Utilizing this, cutting oil is ejected toward the tap T from the oil supply nozzle 49 of the oil supply mechanism 40. Then, the clutch member 5 is pushed toward the forward rotation clutch 2 side via the clutch member holding ring 9 by the biasing force of the return spring 29 that presses the driven shaft 4 toward the base end side, and the forward rotation clutch 2 is engaged. Since they are aligned, the rotation of the drive shaft 1 causes the driven shaft 4 to rotate normally. At this time, as shown in FIG. 8, the rear end of the clutch member holding ring 9 and the spring receiver 31 are separated from each other, and the buffer spring 32 interposed therebetween is in a loosely contracted state.

While the spindle S of the machine tool is being rotated and being fed, the tap T at the tip of the driven shaft 4 is pressed against a work (not shown) to start the tap hole forming operation. At this time, when the tap T does not immediately bite the work, the driven shaft 4 temporarily retracts slightly by the reaction force of the work against the urging force of the absorbing spring 15, so that the tap T works. Then, by the rotation and feed of the main shaft S, the entire tapper mechanism including the driven shaft 4 advances, the tap T enters the hole of the work, and the tap hole forming operation is started. In the process of forming this tap hole, the spindle S
When the feed is stopped, the driven shaft 4 is guided to the tap hole itself, that is, it is independently advanced by the self-propelling force.

In the self-propelling stage of the driven shaft 4, each clutch member 5 held by the clutch member holding ring 9 is engaged with the forward rotation clutch 2 on the tapper body 18 side in a line contact state, On the other hand, the clutch member holding ring 9 and the ball receiver 11 fixed to the driven shaft 4
Since the rotational force transmission ball 10 interposed between the driven shaft 4 and the ring 9 and the ball receiver 11 is in line contact with each other, due to the difference in frictional force between them, first, the driven shaft 4 is driven.
Independently advances from the clutch member retaining ring 9 independently. Therefore, as shown in FIG. 9, the spring bearing 31 locked by the retaining ring 30 moves integrally with the driven shaft 4, whereby the spring 32 is compressed. Further, as the driven shaft 4 moves forward, the spring bearing 28 locked by the retaining ring 27 also moves integrally, so that the return spring 29 is slightly compressed as shown in FIG.

As described above, when the driven shaft 4 advances by a predetermined stroke by the self-propelling force, the spring bearing 31 moving integrally with the driven shaft 4 comes into contact with the rear end of the clutch member holding ring 9, and FIG. As shown in FIG. 10, the clutch member retaining ring 9 advances integrally with the driven shaft 4, whereby the clutch member 5 is disengaged from the forward rotation clutch 2, and reaches the neutral space portion 34 as shown in FIG. The transmission of the rotational force from the normal rotation part a of No. 1 to the driven shaft 4 is blocked, and the neutral state is established. Therefore, a tap hole having a predetermined depth is formed in this neutral state.

From the neutral state, the machine tool,
That is, the main shaft S is returned in the reverse direction by a predetermined amount and the drive shaft 1 is moved backward, so that the right clutch member 5 causes the reverse clutch 3 provided in the drive shaft reversing portion b as shown in FIG. Engage with. Since the rotational force from the forward rotation portion a is constantly transmitted to the drive shaft reverse rotation portion b via the reverse rotation mechanism 33, the driven shaft 4 is reversely driven by the clutch member 5 engaging the reverse rotation clutch 3. To be done. Then, when the driven shaft 4 is rotated in the reverse direction, it is also guided to the tap hole itself,
The tap T will come out of the tap hole.

By the way, when the clutch member 5 is engaged with the reverse clutch 3, the clutch 3, or the driven shaft 1 or the tapper body 18 receives an impact force in the axial direction and the circumferential direction. The shock force in the axial direction can be absorbed by the buffer spring 38, and the shock force in the circumferential direction can be absorbed by the connecting member 6, that is, the connecting pin 13 connecting the connecting member 6 and the reverse clutch 3. It can be absorbed by the elastic member 7 provided therebetween.

Further, a large impact force in the circumferential direction also acts on the clutch member 5, and this impact force is provided on both side surfaces of the ball receiver 11 for receiving the rotational force transmitting ball 10 as shown in FIG. It is absorbed and relaxed by the elastic member 12. That is, the circumferential impact force acting on the clutch member 5 is transmitted to the ball receiver 11 through the clutch member holding ring 9 and the rotational force transmitting ball 10.
However, the impact force transmitted to the ball receiver 11 is absorbed and relaxed by the elastic members 12 mounted on both sides of the ball receiver 11 in the rotational direction of the driven shaft. As a result, the impact force in the circumferential direction and the axial direction applied to the clutch member 5 does not act on the driven shaft 4, so that the tap hole forming accuracy by the tap T is not deteriorated.

When the driven shaft 4 moves backward while reversing, the return spring 29 presses the driven shaft 4 toward the base end side via the spring bearing 28, whereby the clutch member 5 moves from the reverse rotation clutch 3. Smoothly separated, neutral space 3
4, the forward rotation clutch 2 is engaged. Clutch member 5
Is engaged with the forward rotation clutch 2, a large circumferential impact force acts on the clutch member 5.
Similarly to the above, absorption and relaxation are performed by elastic members 12 provided on both side surfaces of a ball receiver 11 that receives the rotational force transmitting ball 10.

At this time, the impact force applied to the clutch member 5 tends to act on the first member 1a of the drive shaft 1. This impact force is applied to the first and second members 1a and 1b and the forward rotation clutch 2. Each pin 1 that connects with and rotatably
It is absorbed and relaxed by the elastic member 8 mounted on the No. 3, so that the propagation to the machine tool side is prevented and the machine tool side is not adversely affected.

Although the tapper mechanism having the built-in reversing mechanism has been described above, the present invention is similarly applied to a tapper mechanism of a type which is operated by rotating the machine tool side spindle in forward and reverse directions. . That is, in the tapper mechanism of the type in which the main spindle of the machine tool is rotated in the forward and reverse directions, a forward rotation clutch and an auxiliary clutch (the auxiliary clutch corresponds to a reverse rotation clutch. The reference numeral "3" is attached to the driven shaft in the axial direction of the driven shaft, and the clutch member has an elastic member on the driven shaft side with a tap attached to the tip end thereof. It is provided so that it can be slightly displaced in the circumferential direction,
With the driven shaft moving in the direction of the predetermined stroke axis and the clutch member disengaged from the forward rotation clutch and switched to neutral, the drive shaft is rotated in the reverse direction, that is, the main shaft of the machine tool is rotated in reverse, and When the clutch member engages with the corresponding auxiliary clutch, the driven shaft is driven in the reverse direction. Therefore, the impact force of the clutch member when the clutch member engages with the auxiliary clutch is the elastic force. Absorption is eased by the member, so that the tap hole forming accuracy by tapping is not reduced.

[0033]

According to the invention of claim 1, when the clutch member on the driven shaft side is engaged with the reverse rotation clutch provided on the drive shaft, the reverse rotation clutch moves the clutch in the axial direction. Since the guide connecting member is attached to the reverse rotation clutch via the elastic member so as to be slightly displaceable in the circumferential direction, the impact force of the clutch member is absorbed by the elastic member when the clutch member is engaged with the reverse rotation clutch. It is relaxed and transmitted to the driven shaft, and therefore, the tap hole forming accuracy is not lowered unlike the conventional tapper mechanism.

Further, the reverse rotation clutch is movable in the axial direction with respect to the drive shaft reverse rotation portion by a connecting member (key member) provided at a circumferentially symmetrical position thereof, and rotates integrally with the drive rotation portion. However, for smooth operation of these, the connecting member (key member) must be attached to the reversing clutch extremely accurately over the circumferential symmetrical position and the axial position. According to the invention, as described above, the elastic member is interposed between the connecting member and the reverse rotation clutch, and the connecting member is attached to the reverse rotation clutch so as to be slightly displaceable in the circumferential direction. Even if there is a slight error in the mounting state of the member and the clutch for reverse rotation in the circumferential direction or the axial direction, the error can be absorbed by the elastic member, which facilitates the manufacturing, and the clutter. The advantage of producing surface of the disengagement of the member and the reverse rotation clutch can be smoothly and accurately performed.

According to a second aspect of the present invention, there is provided a tapper mechanism which is operated by rotating the machine tool side spindle in forward and reverse directions. According to this tapper mechanism, a forward rotation clutch and a shaft for the same are provided on the drive shaft side. When the clutch member on the driven shaft side engages with the auxiliary clutch provided on the drive shaft, the auxiliary clutch slightly shifts in the circumferential direction to the drive shaft via the elastic member. Since it is mounted so that when the clutch member is engaged with the auxiliary clutch, the impact force of the clutch member is absorbed and relaxed by the elastic member and transmitted to the driven shaft, thus forming a tap hole like the conventional tapper mechanism. It does not reduce the processing accuracy.

According to the third aspect of the present invention, the drive shaft is divided into the first member on the side that receives the rotational force from the main shaft of the machine tool and the second member on the side on which the clutch is provided. Is integrally rotatably connected via an elastic member so that the second member can be slightly displaced in the circumferential direction with respect to the first member, so that the impact force of the clutch member when engaging the clutch member clutch Even if it is applied to the first member or the second member, the impact force is absorbed and relaxed by the elastic member, and therefore the machine tool is not adversely affected.

According to claim 4 of the present invention, the circumferential impact force acting on the clutch member is transmitted to the ball receiver through the clutch member holding ring and the rotational force transmitting ball. The impact force transmitted to the receiver is absorbed and relaxed by the elastic member provided on the ball receiver, whereby the impact force in the circumferential direction applied to the clutch member does not act on the driven shaft, thus reducing the tap hole forming processing accuracy. There is no such thing.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an entire tapper mechanism according to the present invention.

2 is a partially enlarged view of the tapper mechanism shown in FIG. 1. FIG.

FIG. 3 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 4 is an enlarged sectional view taken along line BB of FIG.

5 is a partially enlarged detailed view of the tapper mechanism shown in FIG. 1. FIG.

FIG. 6 is a plan view showing a rotational force transmitting ball, a ball receiver, and an elastic member.

FIG. 7 is an enlarged cross-sectional view taken along line CC of FIG.

FIG. 8 is a sectional view showing a first stage of an operating state of the tapper mechanism.

FIG. 9 is a sectional view showing a second stage of the operation state of the tapper mechanism.

FIG. 10 is a sectional view showing a third stage of the operation state of the tapper mechanism.

FIG. 11 is a sectional view showing a fourth stage of the operating state of the tapper mechanism.

[Explanation of symbols]

S Machine tool spindle 1 drive shaft 1a first member 1b Second member a Forward part b Inversion section 2 Forward rotation clutch 3 Reverse rotation clutch (auxiliary clutch) T tap 4 Driven shaft 5 Clutch member 6 Connection member (key member) 7 Reversing clutch side elastic member 8 Elastic member for connecting the first member and the second member 9 Clutch member retaining ring 10 Ball for transmitting torque 11 ball catch 12 Elastic member 13 Connected Pin 18 tapper body

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[Procedure amendment]

[Submission date] August 28, 1998 (1998.8.2)
8)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

Further, as a feature of the present invention,
As shown in FIGS. 1 and 2, and particularly in FIG. 7, a pair of annular recesses 39 are provided at symmetrical positions in the outer circumferential direction of the annular reversing clutch 3, and a ring-shaped elastic member made of natural rubber or urethane rubber is provided therein. 7 is fitted, and the connecting pin 13 is penetrated and held across the connecting member (key member) 6 fitted in the key groove 6a provided in the reverse rotation part b of the drive shaft 1 and the elastic member 7 of the reverse rotation clutch 3. Then, the key member 6 includes the connecting pin 13 and the elastic member 7.
It is attached to the reverse rotation clutch 3 via the so as to be slightly displaceable in the circumferential direction.

Claims (4)

[Claims] 1. A forward rotation clutch and a reverse rotation clutch are provided on a rotationally driven drive shaft, and a driven shaft having a tapped end is provided with a clutch member for engaging the forward and reverse rotation clutch. After the member engages with the forward rotation clutch and the driven shaft moves in the direction of the predetermined stroke axis, the clutch member disengages from the forward rotation clutch and switches to the neutral state, and then the clutch member engages with the reverse rotation clutch. In the tapper mechanism in which the driven shaft is driven to rotate in the reverse direction, the reverse rotation clutch rotates integrally with the drive shaft, but is connected so as to be movable in the axial direction with respect to the drive shaft. A tapper mechanism that is connected to a drive shaft via a member and is attached to a reverse rotation clutch via an elastic member so as to be slightly displaceable in the circumferential direction. 2. A drive shaft that is rotationally driven is provided with a forward rotation clutch and an auxiliary clutch, and a driven shaft having a tapped end is provided with a clutch member that engages with the forward and reverse rotation clutch. Is engaged with the forward rotation clutch, the driven shaft moves in the direction of the predetermined stroke axis, the clutch member disengages from the forward rotation clutch, and is switched to the neutral state.
In a tapper mechanism in which a driven shaft is driven to rotate in the reverse direction by engaging a clutch member with an auxiliary clutch corresponding to a forward rotation clutch, the auxiliary clutch rotates integrally with the drive shaft. The tapper mechanism is connected to the drive shaft via a connecting member so as to be movable in the axial direction with respect to the drive shaft, and the connecting member is attached to the auxiliary clutch via an elastic member so as to be slightly displaceable in the circumferential direction. . 3. The drive shaft is divided into a first member on the side that receives the rotational force from the main shaft of the machine tool and a second member on the side on which the forward rotation clutch is provided, and both members have the second member. The tapper mechanism according to claim 1 or 2, which is integrally rotatably coupled to the first member via an elastic member so as to be slightly displaced in the circumferential direction. 4. The clutch member is held by a clutch member holding ring made of a rigid body that is fitted onto the driven shaft so as to be rotatable and axially movable, and between the holding ring and the driven shaft. Is provided with a rotational force transmitting ball for transmitting the rotational force of the driving shaft to the driven shaft through the clutch member and the holding ring so as to be movable only in the axial direction. 4. A ball bearing made of is prevented from rotating relative to the driven shaft, and an elastic member provided on the ball bearing allows slight displacement in the rotational direction of the driven shaft. The tapper mechanism described in Crab.