JPH04250908A - Device to generate adjusting force for fastening member of fastening device - Google Patents

Abstract

PURPOSE: To actuate an adjusting rod and a fastening member of a fastening device even at the time when a work spindle and the fastening device work. CONSTITUTION: This device is useful for generating adjusting force for a fastening member 2 of a fastening device 1 on a work spindle 4 of a lathe free to drive for rotation. An adjusting rod 8 to actuate the fastening member 2 is arranged free to move in the axial direction in this hollow work spindle 4. A motion conversion system 9 to rotate together on the work spindle 4 has an output member 10 to actuate the adjusting rod 8 in the axial direction and an input member 12 arranged free to rotate as regards the work spindle 4 and in parallel with a shaft, this input member is drivingly connected to gears 11', 11" for adjustment, and these gears for adjustment are arranged on the work spindle 4 coaxially and free to rotate. The fastening device 1 is connected to the work spindle 4 free to rotate, and they are free to connect and disconnect to and from each other through a connecting device 39 in the rotating direction.

Description

[Detailed description of the invention]

0001

FIELD OF INDUSTRIAL APPLICATION The present invention relates to a device for producing an adjusting force for a clamping member of a clamping device, in particular for adjusting the jaws of a chuck or the clamping force exerted by these jaws. , in particular a work spindle of a lathe, which holds a clamping device and can be driven for rotation, and a work spindle of a lathe, which is arranged movable in the axial direction in this hollow work spindle and for actuating the clamping member. The motion conversion system is equipped with an adjustment rod and is arranged to rotate together with the work spindle.
It has an output member for axially actuating the adjustment rod and at least one input member arranged rotatably relative to and parallel to the work spindle, the input member being drive-connected to the adjustment gear. This gear relates to a device that is coaxially and rotatably arranged on the work spindle.

0002

BACKGROUND OF THE INVENTION Such a device is known from DE 33 14 629 C2. In particular, FIG. 5 of this publication shows an embodiment in which only one motor is provided for driving the work spindle and for actuating the adjusting rod. This motor is connected to an input member of the motion conversion system for closing and releasing, ie tightening and loosening, the tightening device. Further, the work spindle is separated from the drive motor and is locked against rotation with a tightening device that is fixedly connected to the head of the work spindle. To carry out the rotation, the work spindle is unlocked and the drive motor is additionally coupled to the work spindle, so that the work spindle and
The input members of the motion conversion system must rotate synchronously with one another; they cannot then rotate relative to the work spindle. Therefore, when the work spindle rotates, the motion conversion system cannot operate at all.

The problems underlying this invention are as follows. That is, in the device mentioned at the outset, the only drive motor provided for driving the work spindle and for actuating the adjusting rod can be used to determine whether the clamping member of the clamping device is closed or opened, i.e. tightened or loosened, even in the stopped state of this device it remains in rotational connection with the work spindle, so that the adjusting rod and
A tightening device can be activated by rotation of the work spindle. This essentially creates the problem of constructing a device in which it is possible to operate the adjusting rod and the clamping member of the clamping device even when the work spindle and the clamping device are in motion.

0004

[Means and effects for solving the problems] According to the present invention,
The tightening device is a work spindle or a part of the work spindle, which part is rotatably connected to a motion conversion system and a drive member serving to drive the work spindle, It is possible to connect and disconnect in the rotational direction, the tightening device and adjustment gear that have been disconnected in the drive member can be fixed so that they do not rotate, and the connection between the output member of the operation conversion system and the adjustment rod is possible. This problem is solved in that a connecting device is inserted into the two, which allows mutual free rotation of the two and provides a kinematic connection or a kinematic connection in the axial direction.

In principle, the axial connection between the output member and the adjusting rod can be a positive connection as well as a kinematic connection. However, at this time, since the rotation speed of the work spindle is high when the motion conversion system is activated, there is a risk of a significant maximum shock value when power is transmitted from the output member to the adjustment rod.
Moreover, the shorter the travel distance of the adjusting rod with respect to the tightening device, the greater this risk. In order to dampen such maximum shock values during power transmission, an axial displacement between the output member and the adjustment rod of the motion conversion system is provided within predefined limits. It is advantageous to provide a power transmission member that allows a relative movement, the magnitude of the force transmitted between them depending on the relative displacement distance between them. Preferably, said power transmission member is formed by a spring element, which supports the output member in both axial directions on the adjustment rod. The tightening device is uncoupled and, like an adjusting gear,
If guaranteed not to rotate, the drive motor converts the motion conversion system via the work spindle or via the part of the work spindle that holds the drive member into the adjustment rod of the output member of this conversion system. Because of its free rotation, it can be rotated with respect to the stationary clamping device and thereby the adjusting rod can be biased and moved axially in one or the other direction.

In particular, various implementation possibilities exist with regard to the position of the connection for the tightening device.

In a first preferred embodiment, the tightening device is rotatably mounted on the work spindle, and a coupling device is provided which non-rotatably connects the tightening device to the work spindle in the coupled state. Here, the motion conversion system is entirely moved by the work spindle when the tightening device is stopped. In order to secure the tightening device when the coupling device is open, it is therefore expedient to provide a locking element which engages on the adjusting rod which is connected in a non-rotatable manner to the tightening device. Instead of locking such an adjustment rod, the coupling device has a coupling part that is axially movable between the clamping device and the work spindle and is non-rotatably connected to the clamping device. , this connecting part is in a position connected to the work spindle under the force of a connecting spring, and is provided with an adjusting member that is prevented from moving in the circumferential direction of the work spindle, and this adjusting member is in a position relative to the connecting part. It is possible to move forward with
In this case, the adjusting member may be configured to release the connecting portion from the connected state on the work spindle against the force of the connecting spring, and at the same time lock it so that it does not rotate. In said case, the coupling part is arranged and guided between two coupling flanges, which are rotatably and axially immovably attached to each other, and one of these flanges Preferably, one connecting flange is fixedly connected to the tightening device, and the other connecting flange is fixedly connected to the work spindle. Obviously, the advantage of this first embodiment is that it only requires measures in the arrangement of the clamping device at the head of the work spindle, which measures in particular do not affect the lathe or the clamping device itself. It does not require any changes and can be easily implemented.

In contrast, in a second preferred embodiment, the clamping device can be fixedly connected to the head of the work spindle in a known manner, but it is necessary to modify the lathe. That is, in this embodiment, the work spindle is divided into a main shaft part that fixes and holds the tightening device, and a main shaft part that fixes and holds the motion conversion system and the drive member for the work spindle. , characterized in that both main shaft parts rotatable relative to each other are connected by a coupling device, and the main shaft part holding the tightening device can be fixed against rotation when the coupling device is uncoupled. There is. Here, the actuation of the motion conversion system takes place only via the spindle section that carries this movement conversion system, while the spindle section that carries the tightening device is at rest. At this time, the main shaft section that holds the drive member and motion conversion system for the work spindle is rotatably attached to the main shaft section that holds the tightening device, and this main shaft section is non-rotatable but movable in the axial direction. holding a coupling member in the shaft, the coupling member being non-rotatably connectable to the other main shaft portion, in particular the drive member, the coupling member being locked against rotation in the uncoupled position of the coupling member; It is structurally convenient.

[0009] Basically, the device according to the invention allows the motion conversion system to operate even when the tightening device rotates. For this purpose, in a preferred embodiment of the invention, the work spindle or the part of the work spindle holding the motion conversion system is provided with a second adjusting gear coaxially with the first adjusting gear, the second adjusting gear being coaxial with the first adjusting gear; The second adjustment gear is rotatable in opposition to the work spindle and the first adjustment gear, and both adjustment gears are connected in opposite directions, and the adjustment gears are used to perform braking independently of each other. A braking device is provided which can control the braking moment and the magnitude of the braking moment can be controlled.

As a result of the above, even when the tightening device rotates, the motion conversion system is supplied with energy transmitted to the work spindle by the drive device of the work spindle itself in order to operate the adjustment rod. The motion conversion system therefore remains fully functional during the rotation process. For actuation of the adjusting rod when the tightening device rotates, one or the other adjusting gear must be braked and the adjusting rod is thereby biased in the axial direction by the output member of the movement conversion system. direction (i.e. retightening of the tightening member in the tightening device,
or loosening, depending on the intended direction).
It is only necessary to rotate the adjusting gear relative to the work spindle. Moreover, it is also easily possible to open and close the clamping device during operation of the workpiece spindle, which means that when the rod is activated for clamping the workpiece without forcing the clamping device to stop, desired. In each case, by controlling the magnitude of the braking moment, it is possible to precisely influence the force with which the adjustment rod is biased and, with it, the effective clamping force in the clamping device. There is another possibility.

[0011] Preferably, in order to connect the two adjusting gears in opposite directions, at least one transmission member is provided, which is arranged to rotate together with the work spindle, and this transmission member and is supported in the circumferential direction of the work spindle in such a way that relative rotation of one adjusting gear with respect to the work spindle causes relative rotation of the other adjusting gear in the opposite direction. ing. The advantage of this is that without braking one of the adjusting gears, the adjusting gears rotate synchronously with each other and with the work spindle, so that stresses in the transmission member only occur when one of the adjusting gears is braked. It's there. In particular, the transmission member is formed by one or more mutually engaging pinions which are attached to the work spindle and which engage gear rims each provided on an adjusting gear. It can be configured as follows. Another advantageous embodiment provides that the transmission element is formed by one or more central pins, each holding two pinions in a non-rotatable manner, which central pins are likewise rotatably arranged on the work spindle. are rotatably mounted in a fixed ring, in each case one pinion of the center pin being attached to one gear rim of the adjusting gear, the other pinion being attached to a gear rim fixed to the work spindle; It is characterized by engaging. In this case, the second adjusting gear may expediently be formed directly by the ring on which the central pin is attached.

The motion conversion system may be mechanical, pneumatic, and/or
Or it can be operated hydraulically. As a purely mechanical embodiment, this motion conversion system can, in principle,
It has one or more tightening screws which convert rotational movement of the input member into an axial adjusting movement of the output member. In this respect, a particularly preferred embodiment for kinematic and dynamical reasons is that the motion conversion system is arranged with its axis parallel to and eccentrically with respect to the work spindle, and is rotatably and axially movable. at least one clamping screw shank fixedly mounted, the clamping screw shank having its clamping screw thread extending in a thread receptacle provided in the output member of the motion conversion system; , via an input member of the movement conversion system, in the direction of rotation is in a driving connection with at least one of the adjusting gears, and in the circumferential direction of the work spindle, this tightening screw shaft is in a driving connection with the tightening screw shaft. The invention is characterized in that the work spindle is supported by the work spindle so that the relative rotation of the work spindle facing the adjusting gear causes the tightening screw shaft to rotate about its own axis. For purpose,
A plurality of tightening screw shafts are provided, and the tightening screw shafts are distributed and arranged around the work spindle.

[0013]An embodiment which is particularly simple in construction and which is therefore advantageously realized is such that the tightening screw shaft is entirely or partially
In the case of a plurality of tightening screw shafts, which form a transmission member that connects both adjusting gears in opposite directions, this screw shaft simultaneously functions as a transmission member that connects the adjustment gears in opposite directions. It is characterized by satisfying the following. When braking the corresponding adjusting gear, ensure that the clamping screw shaft is loosened from the clamping fit in the threaded receptacle of the output part, which may be very hard due to the preceding clamping process. In order to be able to do this, it is preferable to construct the threaded receptacle for the tightening screw shaft in a threaded socket, which socket can be rotated in a limited manner between two stops in the output member. and is mounted so as not to be movable in the axial direction. Therefore, in the tightening screw shaft, when one of the adjustment gears is braked, the screw socket is stopped by the stopper, and the impact effect on the thread fit created by this is applied to the thread receiving part. It can first be rotated freely under the rotational drive of the threaded socket until the tightening screw shaft of is released.

The shape of the motion conversion system that leads to a particularly symmetrical stress relationship is such that the work spindle is provided with a pair of tightening screw shafts that are fixedly disposed in the circumferential direction, and each of them has a shape that leads to a symmetrical stress relationship. is provided with a pinion as an input member, in which case the first clamping screw shaft of the pair of clamping screw shafts has its own pinion on the gear rim of one of the adjusting gears, and
The second clamping screw shaft engages with its pinion in the gear rim of the other adjusting gear, and both clamping screw shafts engage in opposite directions via the other pinion connecting member. It is further characterized in that its own tightening threads have mutually opposite thread directions. Since the clamping screw threads have such opposite thread directions, it causes an equal axial movement of the output member in both clamping screw shafts despite the opposite rotation of the clamping screw shafts. .

The two adjusting gears, as already mentioned, are connected to each other by pinions, which are non-rotatably mounted on a center pin which is rotatably arranged on the work spindle. If the clamping screw shaft is to be mounted in a ring, the clamping screw shaft can expediently directly form the said central pin, so that this central pin is no longer clamped. There is no need for additional provision in addition to the screw shaft.

[0016] The braking system has only one brake that can be selectively switched or replaced by one or the other adjusting gear, or uses its own brake for each adjusting gear. Good too. that time,
These brakes can be activated and/or controlled independently of each other. In the simplest embodiment, the braking device is a friction brake provided for each adjusting gear, in particular a shoe brake or an axial (disc) brake with the adjusting gear configured as a brake disc. It may be. In this embodiment, the braking device can also be used for fixing the adjusting gear during actuation of the adjusting rod when the tightening device is stopped. This is not possible in the following braking devices, so that in addition to the braking device, a suitable locking device must be provided for the fixing of the adjusting gear.

Compared to friction brakes, an essentially better and preferred embodiment for the control and regulation of the braking action, also due to the absence of mechanical wear, is such that the braking device for each adjusting gear is connected to the rotor. The motor is configured as an induction machine that functions as a brake, and is equipped with an adjusting gear and a stator ring that has an excitation coil and surrounds the adjustment gear. It is characterized by being controllable. In particular, the induction machine may be configured as an eddy current brake. In both cases, the magnitude of the excitation current essentially determines the damping effect. This damping effect is difficult to switch on and off as desired and is difficult to control in terms of its magnitude using conventional electrotechnical switching means. Furthermore, in the case of control and/or adjustment of the braking effect, it is advantageous for the braking device to be equipped with a measuring device for the magnitude of the braking moment applied to the adjusting gear so that the actual value of the braking moment can be known. It is a purpose.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention will be explained in detail below by means of illustrated embodiments.

In the figure, the clamping device 1 is a chuck, which is equipped with a clamping member 2, ie, a radially movable chuck jaw. The clamping device 1 is shown schematically, and only the chuck jaws of the clamping member 2 are shown. A tightening device 1 is attached to a head 3 of a work spindle 4 of a lathe.
It is set in. Other parts of the lathe are not shown. The work spindle 4 is mounted in a head stock (not shown) of the lathe via a bearing 5 shown only in FIGS. 4 and 6. This work spindle 4 is connected to a motor 6 or, for example, as shown in FIG.
It can be driven in a known manner by a drive member 7, shown as a belt pulley at 2. Therefore, this driving method will not be illustrated any further. A tubular adjustment rod 8 is disposed within the hollow work spindle 4. By moving this adjusting rod 8 in the axial direction, ie by applying a force in the axial direction with this adjusting rod 8, the tightening member 2 of the tightening device 1 can be actuated. The adjustment rod 8 is actuated by a motion conversion system generally designated by 9. The motion conversion system 9 is arranged to rotate together with the work spindle 4. This motion conversion system 9 includes an output member 10 that actuates the adjustment rod 8 in the axial direction, and at least one input member 12, 12', 12'' that is rotatably arranged with respect to the work spindle 4 and parallel to the axial direction. This input member is in driving connection with at least one of the two adjusting gears 11', 11''. The adjustment gears are disposed opposite to each other on the work spindle 4, coaxially and rotatably arranged with respect to the work spindle itself, and connected in opposite directions. As a result, the rotation of one of the adjusting gears 11', 11'' relative to the work spindle 4 is connected to the corresponding rotation in the opposite direction of the other of the adjusting gears 11', 11''. 32 indicates the entire braking device. With this braking device, 2
The two adjustment gears 11' and 11'' can be braked independently of each other. In that case, the magnitude of the braking moment can be controlled by the method described later. Therefore, when the work spindle 4 is rotating, the adjustment When one of the gears 11', 11'' is braked, this adjustment gear is rotated relative to the work spindle 4, and as a result, the adjustment rod 8 moves in the axial direction and moves in the axial direction. Force acts. Due to the braking of the other of the adjusting gears 11', 11'', the adjusting rod 8 moves in the opposite axial direction, and a force acts in this opposite direction.As a result, when the work spindle 4 is in operation, , the tightening member 2 of the tightening device 1 is connected to one or the other adjusting gear 11
', 11'' can only be actuated in the closing or opening direction by braking. As a result, for example, internal and external tightening is also possible. In principle, the adjusting rod 8 1. Therefore, as will be described later, if the motion conversion system 9 can be rotated relative to the work spindle 4, facing the tightening device 1 and the adjustment rod 8. For example, the output member 10 of the motion conversion system
The output member 10 can be freely rotated facing the adjustment rod 8, but the adjustment rod 8 and the output member 10
The axially movable connection 13 between must be connected to the adjustment rod 8 in such a way that it remains maintained. For this purpose, in the exemplary embodiment, the adjustment rod 8 is provided with an annular flange 13', in which the output member 10 of the movement conversion system 9 is rotatably guided and supported via a thrust bearing 13''. Furthermore, in FIG. 2 the support essentially consists of a form-fitting connection, whereas in FIG. 2 a cup spring 100 is arranged between the output element 10 and the adjustment rod 8. This cup spring supports the output member 10 on the adjustment rod 8 in both axial directions.As a result, the relative movement in the axial direction between the output member 10 and the adjustment rod 8 is caused by the force of the cup spring 100. However, this relative movement is only possible within a predetermined range. 13' is provided by being fixed and stopped via one of the thrust bearings 13'' and the cup spring 100 to the annular shoulder of the output member 10 supporting the cup spring 100.

The two adjusting gears 11', 11'' are connected in opposite directions as already mentioned, and for this purpose are provided with at least one transmission element, which elements rotate together. It is arranged on the work spindle 4. This transmission member is drivingly connected to adjustment gears 11', 11''. The transmission members 11', 11'' are arranged so that relative rotation of one adjusting gear 11' with respect to the work spindle 4 causes relative rotation of the other adjusting gear 11' in the opposite direction.
It is supported by the work spindle 4 in the circumferential direction thereof. This is most easily achieved as follows. That is, the transmission member is formed by one or a plurality of pinions 14 that engage with each other, and this pinion 14 is attached to the work spindle 4 and is connected to a gear rim provided on each of the adjusting gears 11', 11''. 1
5 is engaged. In the embodiment of FIGS. 1 and 3, the pinions 14, singly or in combination, are distributed around the work spindle 4 and are each attached to the work spindle 4 in the radial direction by means of a central pin 16. mounted and configured as a bevel pinion. This pinion 14 engages a correspondingly conically shaped gear wheel rim 15 on both adjusting gear wheels 11', 11''. In the embodiment of FIGS. It consists of one or more central pins 14' that non-rotatably hold pinions 17', 17''. The center pin is rotatably disposed within the ring 18 via a rolling bearing 20, and the ring 18 is also rotatably disposed on the work spindle 4 via a rolling bearing 19. One pinion 17' of each center pin 14' engages with the gear rim 15 of the adjusting gear 11', and the other pinion 17'' engages with the gear rim 21 fixed to the work spindle 4. Gear rim 21 is provided on a ring 21' which is disposed on the work spindle 4 so as to be non-rotatable and immovable in the axial direction.Therefore, the adjustment gear 11' is attached to the work spindle 4 in the direction of the arrow 22 in FIG. When rotated oppositely, the center pin 14' rotates in the direction of the arrow 23, since it is supported on the gear rim 21 fixed to the work spindle 4, so that the ring 18 as a whole arrow 24
A rotation in the direction of is induced. That is, the result is that the rotation of the adjusting gear 11' is opposite to the rotation of the ring 18. Therefore, the ring 18 in the case of FIG.
A second adjusting gear 11'' is formed. However, in the case of FIG. 6, a second adjusting gear 11'' is provided in addition to the ring 18 described above. In this case, the second adjusting gear 11'' is rotatably mounted on the ring 18 via a bearing 25, and the gear rim 15 of the adjusting gear 11'' engages with the pinion 17''. Pinion 17”
is engaged with a gear rim 21 fixed to the work spindle 4.

In all embodiments, the motion conversion system 9 has a plurality of tightening screw shafts 26, 26', 26''. They are scattered around the area. These tightening screw shafts 26,
26' and 26'' are arranged with their axes parallel to and eccentrically arranged with respect to the work spindle 4.These tightening screw shafts are rotatably attached and immovable in the axial direction. The tightening thread 27 ′ of the tightening screw shaft 26 , 26 ′, 26 ″ extends in a thread receptacle 27 provided in the output member 10 of the movement conversion system 9 . The tightening screw shaft 26,
26', 26'' are in rotationally driving connection with at least one of the adjusting gears 11', 11''. Further, the tightening screw shafts 26, 26', 26'' are connected to the work spindle 4 relative to the adjusting gears 11', 11'' which are drivingly connected to the tightening screw shafts 26, 26', 26''. The tightening screw shaft is supported by the work spindle 4 in the circumferential direction of the work spindle 4 so that the tightening screw shaft rotates around its own axis.

In the case of FIGS. 1 and 3, the tightening screw 2
6 is independent of the transmission member 14 which causes the reverse connection of the adjusting gears 11', 11'', and this transmission member 1
It is provided in addition to 4. On the other hand, in all other embodiments, the tightening screw shafts 26, 26', 26''
are constructed and arranged so as to simultaneously function as both transmission members 14', 14'' which connect the adjusting gears 11', 11'' in opposite directions.

That is, in the embodiments of FIGS. 4 to 6,
The tightening screw shaft 26 at the same time forms the central pin 14' which holds the pinion 17'17''. In this case,
In order to operate the motion conversion system 9 by braking the adjustment gear 11', for example, in the case of FIG. 6, the input member 12' of the motion conversion system is formed by the pinion 17';
In the case of braking of the adjusting gear 11'', the input element is formed by a pinion 17''.

FIGS. 7-12 show substantially identical embodiments with respect to the motion conversion system and its operation. In these embodiments, a pair of tightening screw shafts 26' and 26'' are fixedly disposed in the circumferential direction on the work spindle 4. In the figure, two pairs of screw shafts are provided for the work spindle 4. These tightening screw shafts 26', 26'' are arranged opposite to each other in the diametrical direction with respect to the main shaft 4.
It has its own pinion 28', 28'' as input member 12', 12'' for. The pinion 28' of the first clamping screw shaft 26' of each pair of clamping screw shafts is engaged in the gear rim 15 of one of the adjusting gears 11', and the pinion 28' of the first clamping screw shaft 26' of each pair of clamping screw shafts The pinion 28'' of the second tightening screw shaft 26'' engages with the gear rim 15 of the other adjusting gear 11''.Furthermore, each pair of tightening screw shafts 26', 26'' engages with the other pinion connection. They engage in opposite directions through the member 14'', so that both of these tightening screw shafts 26', 26
” always rotates in the opposite direction.Then, both tightening screw shafts 26
', 26'' are connected to the adjusting gears 11', 11'' via pinions 28', 28'', so both tightening screw shafts 26', 26'' connect the adjusting gears 11', 11'' in reverse. The tightening screw shaft 2 of each tightening screw shaft pair
6', 26'' are provided with screw threads 27'' whose screw directions are opposite, so that the output member 10 is equally moved in the axial direction by rotation of both tightening screw shafts 26', 26'' in opposite directions. .

In FIGS. 10 and 11, a screw thread receptacle 27 for a tightening screw shaft 26', 26'' is provided in a screw socket 29. , is rotatable with a limit between the two stoppers 30, 30', but is mounted immovably in the axial direction.Therefore, the adjusting gears 11', 11
When one of the two screws is braked, first the tightening screw shaft 26', 26'' containing the screw socket 29 can freely rotate until the screw socket 29 is stopped by the stopper 30, 30'. This ensures that even if the tightening screw shaft 26', 26'' fits very firmly in the threaded receptacle 27 due to the preceding tightening process, the threaded fit 27
, 27' will act in the threaded fit 27, 27'.

In all embodiments, the braking device 32 includes:
For each adjusting gear 11', 11'', an induction machine is constructed which acts as a brake, the induction machine having the respective adjusting gear as a rotor and an excitation coil 31 surrounding this adjusting gear. Stator ring 32', 32"
It is equipped with In this excitation coil 31, the magnitude of the excitation current and the adjustment gears 11', 11
In this embodiment, the induction machine is most simply configured as an eddy current brake.Furthermore, the braking device 32 includes an adjusting gear 11'. , 11'' can be provided to measure the magnitude of the braking moment applied. This measuring device consists of stator rings 32', 32''
However, since it is not shown in detail where and how the stator rings 32', 32'' are arranged in the machine frame, the construction of the measuring device is is also not shown.

Adjustment gears 11', 1 by braking device 32
1" makes it possible to actuate the adjusting rod 8 only when the work spindle 4 is activated. Furthermore, the drive 6, 7 provided for the work spindle 4 allows the tightening Arrangements are made throughout in such a way that the device 1 can be operated even in its standstill state.For this purpose, the tightening device 1 itself is connected to the drive of the work spindle and thus to the It can be coupled in the rotational direction to the drive motor 6 or to the belt pulley 7 of FIGS.
can be fixed against rotation similarly to at least one of the adjusting gears 11', 11''.

For the above reasons, in detail, in the embodiments shown in FIGS. 1 and 4, the tightening device 1 is made rotatable via the bearing 38 and is immovable in the axial direction, so that the work spindle 4 is fixed. It is attached to the head 3. A coupling device 39 is then arranged, which in its illustrated coupled state connects the tightening device 1 to the work spindle 4 in a non-rotatable manner. This coupling device 39 has a coupling member 80 which engages in a coupling receptacle 82 of the tightening device 1 under the action of a coupling spring 81 . Connecting member 8
0 is axially movably guided in the head 3 of the work spindle 4 and can be released from the connected state against the force of a connecting spring 81 by means of a pneumatically actuatable adjusting piston 83. A locking member 40 that can engage an adjustment rod 8 that is non-rotatably connected to the tightening device 1 in order to fix the tightening device 1 when the coupling device 39 is open.
works. This member 40 is held in a disconnected state by a connecting spring 84. This locking member 40 is guided so as to be movable in the radial direction with respect to the adjusting rod 8 in a not-illustrated part of the machine frame, and the adjusting rod is moved against the force of a connecting spring 84 by means of an adjusting piston 85 that can be actuated by pneumatic pressure. 8 into the coupling receiving section 86 . A further locking device 41 is arranged, which locks one of the two adjusting gears 11', 11''. This locking device 41 engages directly on one of the adjusting gears 11', 11''. In the case of the embodiments of FIGS. 4 and 6, the central pin 14'
That is, it engages with the ring 18 to which the tightening screw shaft 26 is attached. The locking device 41 has an adjusting piston 86' which can be actuated pneumatically in some cases. This piston 86' moves the locking member 87 in the radial direction of the work spindle 4.
move it towards. This locking member 87 is movably guided within an unillustrated portion of the machine frame. A connecting spring 88 holds the locking member 87 in a disengaged state. When the adjusting piston 86' is actuated, the locking member 8
7 engages in an associated locking receptacle 89 on the ring 18 or on one of the adjusting gears 11', 11''.

The coupling device 39, the locking member 40 and the locking device 41 are all controlled via a pneumatic line leading to a pneumatic pressure source 91, which is schematically shown.

The tightening device 1 is therefore decoupled from the work spindle 4 by the open coupling device 39 and one of the two adjusting gears 11', 11'' or the ring 18
If rotation is also prevented, the tightening device can be rotated by the drive of the work spindle 4. As a result, the motion conversion system 9 rotates accordingly. This is because, as in FIG. 1, the tightening screw shaft 26 is fixed directly to the work spindle 4 and is attached to an extension 42 forming part of this work spindle, or as in FIG. 4 or 6. , gear rim 2 fixed to work spindle 4
This is because it is engaged with the work spindle 4 via the shaft 1. In either case, this causes the tightening screw shaft 26 to rotate about its own axis, and as a result, the output member 1
0 and the adjustment rod 8 are both actuated in the axial direction. The resulting axial movement can be detected by a suitable position indicator, for example indicated at 43 in FIGS. 4 and 6.

In the embodiment shown in FIG. 7, reference numeral 44 indicates the entire coupling device, and this coupling device 44 is movable in the axial direction between the tightening device 1 and the work spindle 4.
The connecting portion 4 is non-rotatably connected to the key member 45 through the key member 45.
6. The connecting portion 46 is connected to the work spindle 4 via a Hirth-type gear cutter 48 under the force of a connecting spring 47 . In FIG. 7, the disconnected state is shown. An adjusting member 49 fixed to the machine table and prevented from moving in the circumferential direction of the work spindle 4 can be moved forward with respect to the coupling part 46 by means of a hydraulic cylinder-piston device 50 . This adjustment member 4
9 releases the connecting portion 46 from the hearth type gear cutter 48, that is, from the connected state on the work spindle 4 against the force of the connection spring 47, and at the same time does not rotate around the axis of the work spindle 4. Thus, the adjusting member 49 locks the connecting portion 46. For this purpose, the adjustment member 49 has a locking member 51 that engages in a corresponding locking receptacle 52 on the coupling part 46 . In detail, the connecting part 46 is arranged and guided between the two connecting flanges 53, 54. These flanges 53, 34 are rotatably and axially immovably mounted together. For this purpose, the connecting flange 53 has a bearing ring 55 in which the other connecting flange 54 is guided and supported radially and axially via rolling bearings 56. A connecting part 46 is guided in a non-rotatable but axially movable manner in contact with one connecting flange 53. are fixed respectively. Even in this case, if the tightening device is disconnected from the work spindle 4 and fixed so as not to rotate, the locking device 41
works to prevent one of the adjusting gears 11', 11'' from rotating. At that time, when the work spindle 4 is driven, as already mentioned, the stopped tightening device 1
The movement conversion system 9 is driven with a corresponding axial movement of the adjusting rod 8 in .

In FIG. 12, the work spindle 4 consists of a front spindle portion 4' and a rear spindle portion 4''. It is installed in the table, and the rear main spindle portion 4'' fixes and holds the movement system 9 and the drive member 7 for the work spindle 4. The rear main shaft section is formed by the components 42, 42'. These parts 42, 42' are screws 4
2", and is connected by a screw 42'" to a belt pulley forming the drive member 7. Both main shaft parts 4', 4" are rotatable relative to each other and are indicated generally at 57. connected by a coupling device. In this case, when the coupling device 57 is in the disconnected state, the front main shaft portion 4' holding the tightening device 1 can be fixed so as not to rotate. In detail, the drive member 7 and the motion conversion system 9
A rear main shaft portion 4'' holding the fastening device 1 is rotatably attached to a front portion 4′ holding the tightening device 1;
The front part 4' further has a support flange 58. The drive member 7 is a rear main shaft portion 4'' that holds the motion conversion system 9.
The drive member 7 is fixedly connected to the support flange 58 and is guided axially and radially via a rolling bearing 59. The front main shaft part 4' holds a coupling member 61 non-rotatably and axially movably via a keyed connection 60. This member 61 is non-rotatably connectable to the drive member 7 and the rear main shaft portion 4'' and is locked so as not to rotate in the uncoupled position of the member 61. is performed via the connecting gear cutter 62, and the locking to prevent the connecting member 61 from rotating is performed by the connecting gear cutter 6.
3. In the upper half of FIG. 12, a purely mechanically actuated coupling member with a coupling part 65 movable in the direction of the double arrow 64 is shown, and in the lower half of the figure:
An electromagnetically actuatable coupling member is illustrated. In both cases, the coupling member 61 is in coupling engagement with the drive member 7 under the action of a coupling spring 66 . Activation of the coupling member causes the coupling member 61 to move to the right in FIG. 12 against the force of the coupling spring 66 and engage with the coupling gear 63. This locks the coupling member 61 and thus the front shaft part 4' with the tightening device 1 against rotation. Via the spindle drive and the drive element 7, it is now possible to rotate the rear spindle part 4'', which results in a corresponding rotation of the movement conversion system 9 and an intentional axis of the adjustment rod 8. A directional movement and, with it, a closing and opening, ie tightening and loosening, of the tightening device 1 results.

Finally, the present invention can be summarized as follows.

This device serves to create an adjusting force for the clamping member (2) of the clamping device (1) in the work spindle (4) of the lathe, which can be driven into rotation. An adjustment rod (8) for actuating the clamping member (2) is disposed in this hollow work spindle (4) so as to be movable in the axial direction. A motion conversion system (9) arranged to rotate together on the work spindle (4) is rotatable with respect to the work spindle (4) and an output member (10) for axially actuating the adjustment rod (8). In addition, it has an input member (12) arranged parallel to the axis, and this input member includes adjustment gears (11', 11'').
This adjustment gear is connected to the work spindle (4
) are coaxially and rotatably arranged. Tightening device (
1) is rotatably connected to the work spindle (4) and can be coupled and uncoupled in the direction of rotation via a coupling device (39). The uncoupled tightening device (1) and the adjusting gear (11', 11'') can be fixed against rotation by a locking member (40) or a locking device (41).Furthermore, the output member (10) and the adjusting rod (8), a connecting device (13) is inserted which provides an axial movement connection allowing a free relative rotation of the two, so that they are uncoupled and cannot rotate. The clamping member (2) of the clamping device, which is locked in place, can be actuated by driving the work spindle.

[0035]

According to the present invention, the only drive motor provided for the drive of the work spindle and the adjustment rod is activated when the clamping member of the clamping device is closed or opened, that is, when the clamping member of the clamping device is In the standstill state of the device, it remains in rotational connection with the work spindle, so that the adjusting rod and the tightening device can be actuated by rotation of the work spindle. In principle, this allows the adjustment rod and the clamping element of the clamping device to be actuated even when the work spindle and the clamping device are in motion.

[Brief explanation of the drawing]

1 is an axial cross-sectional view of the device of the invention, FIG. In order to understand the present invention, only essential parts are shown, and some parts are omitted.

FIG. 2 shows an embodiment that is slightly modified from FIG. 1, and shows the details of the connecting portion between the output member and the adjustment rod in an enlarged manner from FIG. 1;

3 shows a side view of the device of FIG. 1 in the direction of arrow II in FIG. 1; FIG.

FIG. 4 is a diagram corresponding to FIG. 1 showing another embodiment of the present invention.

FIG. 5 is a sectional view taken along line IV-IV in FIG. 4;

6 shows a slightly modified embodiment of the adjusting gear, illustrating part of the object of FIG. 4 without the head of the work spindle and the tightening device; FIG.

FIG. 7 shows another embodiment of the device of the invention in FIG.
FIG. 3 is a partially schematic axial section along VI;

8 is a plan view of the object of FIG. 7 in the direction of arrow VII of FIG. 7, partially in section; FIG.

FIG. 9 is a cross-sectional view taken along line VIII-VIII in FIG. 8;

FIG. 10 shows an embodiment in which the parts indicated by IX in FIGS. 7 and 9 are changed.

FIG. 11: FIG. 1 in the direction of arrow X shown in FIG. 10.
0 is a front view of the object.

12 shows another embodiment of the device according to the invention in a diagram corresponding to FIG. 7;

[Explanation of symbols]

1......Tightening device 2......Tightening member 3......Head 4......Work spindle 4'...Spindle part 4''...Spindle part 5...Bearing 6...Motor 7...Drive member (belt/pulley) 8......
Adjustment rod 9......Motion conversion system 10...Output member 11...Adjustment gear 12...Input member 12'...Input member 12''...Input member 13... ...Connecting device 13'......Annular flange 13"......Thrust bearing 14...Pinion 14'...Center pin 14"...Pinion connecting member 15......Gear rim 16...... …Center pin 17'…Pinion 17”…Pinion 18…Ring 19…Rolling bearing 20…Rolling bearing 21…Gear rim 21’…Ring 23… ......Arrow 24...Arrow 25...Bearing 26...Tightening screw shaft 26'...Tightening screw shaft 26''...Tightening screw shaft 27..........Thread receiving part 27 '...Tightening thread 28'...Pinion 28''...Pinion 29...Screw socket 30...Stopper 30'...Stopper 31...Exciting coil 32... Braking device 32'...Stator ring 32''...Stator ring 38...Bearing 39...Connection device 40...Lock member 41...Lock device 42... Extension part (component part) 42'......Component part 42"...Screw 42'''...Screw 43...Position 44...Coupling device 45...Key member 46... Connecting portion 47……Connecting spring 48……Haarth type gear cutter 49……Adjusting member 50……Cylinder/piston device 51……Lock member 52……Lock receiving portion 53…………Connecting flange 54…………Connecting flange 55…………Bearing ring 56…………Rolling bearing 57…………Connection device 58…………Support flange 59…………Rolling bearing 60 …………Key connection 61 …………Connection member 62 …………Connection gear 63 …………Connection gear 64 …………Bidirectional arrow 65 …………Connection portion 66 …………Connection spring 80…………Connection member 81…………Connection spring 82…………Connection receiving part 83…………Adjustment piston 84…………Connection spring 85…………Adjustment piston 86…………Connection reception Part 86'...... Adjustment piston 87... Lock member 88... Connection spring 89... Lock receiving part 91... Air pressure source

Claims (24)

[Claims] 1. For creating an adjusting force for the clamping member (2) of the clamping device (1), in particular for adjusting the jaws of the chuck or the clamping force exerted by these jaws. A device comprising a work spindle (4) of a lathe, which holds a tightening device (1) and is driveable for rotation, and which is disposed axially movably within this hollow work spindle (4). It is provided with an adjustment rod (8) for operating the tightening member (2), and a motion conversion system (9) arranged to rotate together (interlocked rotation) on the work spindle (4).
) actuates the adjustment rod (8) in the axial direction.
) and at least one input member (12, 12') arranged rotatably with respect to the work spindle (4) and parallel to the axis.
, 12"), and this input member is drivingly connected to an adjustment gear (11', 11"), which is coaxially and rotatably arranged on the work spindle (4). In the device in which the tightening device (1) is attached to the work spindle (4
) or a part (4”) of this work spindle that holds the operation conversion system (9) and the drive member (7) that serves to drive the work spindle (4). The tightening device (1) and the adjusting gear (11', 11'') can be fixed so that they do not rotate. Yes, the output member (10) of the motion conversion system (9) and the adjustment rod (8
), a connecting device (13) is inserted between the two and which is axially movably connected and allows free rotation of the two relative to each other. 2. The device according to claim 1, wherein the tightening device (1) is rotatably attached to the work spindle (4), and is provided with a coupling device (39, 44), which The device is characterized in that, in the coupled state, the tightening device (1) is non-rotatably connected to the work spindle (4). 3. The device according to claim 2, wherein the coupling device (39) is non-rotatably connected to the tightening device (1) in order to secure the tightening device (1) when the coupling device (39) is opened. a locking member (40) adapted to engage with the adjustable rod (8);
A device characterized by being equipped with. 4. The device according to claim 2, wherein the coupling device (44) is movable in the axial direction between the tightening device (1) and the work spindle (4) and ) and a connecting part (46) that is non-rotatably connected to the work spindle (4), and this connecting part receives the force of the connecting spring (47) and rotates the work spindle (4).
An adjustment member (49) is provided, which is located in a position connected to the work spindle (4) and prevents movement of the work spindle (4) in the circumferential direction. At this time, this adjustment member is a device characterized in that it releases the connecting part (46) from the connected state in the work spindle (4) against the force of the connecting spring (47), and at the same time locks it so that it does not rotate. . 5. The device according to claim 4, wherein the coupling part (46) is arranged and guided between two coupling flanges (53, 54), which flanges are rotatably and axially one of these flanges (5
3) connects the other connecting flange (54) to the tightening device (1).
are each fixedly connected to the work spindle (4). 6. The apparatus according to claim 1, wherein the work spindle (4) includes a spindle portion (4') that fixes and holds the tightening device (1), a motion conversion system (9), and a work spindle ( 4) Main shaft portion (4”) that fixes and holds the drive member (7)
It is divided into two main shaft parts that can rotate relative to each other (
4', 4'') are connected by a coupling device (57), and the main shaft portion (4') holding the tightening device (1) is prevented from rotating in the uncoupled state of the coupling device (57). A device characterized in that it is fixable. 7. The apparatus according to claim 6, wherein the main shaft portion (4'') holding the drive member (7) and the motion conversion system (9) for the work spindle (4) is connected to the tightening device (1). ) is rotatably attached to the main shaft part (4') that holds the
This main shaft portion (4') holds a connecting member (61) non-rotatably and movably in the axial direction, and this connecting member (61)
is non-rotatably connectable to the other main shaft part (4''), in particular to the drive member (7), and in the uncoupled position of the connecting member (61), the connecting member (61) is locked against rotation. A device characterized by: 8. The apparatus according to claim 1, wherein the work spindle (4) or the motion conversion system (9)
A second adjusting gear is disposed coaxially with the first adjusting gear (11', 11'') in the part (4") of the work spindle (4) that holds the The adjustment gear is rotatable facing the work spindle (4) and the first adjustment gear, and both adjustment gears (11', 11'') are connected in opposite directions to each other, and the braking device (32 ), with which the adjusting gears (11', 11'') can be braked independently of one another, the magnitude of the braking moment being controllable. 9. The device according to claim 8, in which at least two adjusting gears (11', 11'') are arranged to rotate together on the work spindle (4) in order to connect the two adjusting gears (11', 11'') in opposite directions. One transmission member (14, 14', 14"
), and these transmission members are drivingly connected to the adjusting gears (11', 11''), and in the circumferential direction of the work spindle, one of the adjusting gears with respect to the work spindle (4) A device, characterized in that it is supported on the work spindle (4) in such a way that relative rotation causes a relative rotation in the opposite direction of the other adjusting gear. 10. The apparatus of claim 9, wherein the transmission member comprises one or more mutually engaging pinions (
14), and this pinion (14)
is attached to the work spindle (4), and the gear rims (1
5). 11. The device according to claim 9, wherein the transmission member comprises one or more pinions (
The center pin (14', 17'') is held non-rotatable.
'), which central pin is rotatably mounted in a ring (18) which is also rotatably arranged on the work spindle (4), with each central pin being One pinion (17') of (14') is attached to one gear rim (15) of the adjustment gear (11'), and the other pinion (17'') is attached to the gear rim (21) fixed to the work spindle (4). ). 12. The apparatus according to claim 11,
The second adjustment gear (11”) directly connects the center pin (14)
A device characterized in that it is formed by a ring (18) for attaching. 13. The device according to claim 1, wherein the motion conversion system (9) has at least one tightening screw shaft (26, 26', 26''), which The tightening screw shaft is arranged eccentrically and parallel to the work spindle (4), and is attached rotatably but immovably in the axial direction. The screw thread (27') is the output member (1) of the motion conversion system (9).
0), and further via the input member (12') of the motion conversion system (9),
In the rotational direction, the tightening screw shaft is drivingly connected to at least one of the adjusting gears (11', 11''), and in the circumferential direction of the work spindle (4), the tightening screw shaft (26,
26', 26") and the adjustment gear (11
The relative rotation of the work spindle (4) facing the
A device characterized in that it is supported on a work spindle (4) in such a way as to cause rotation of the tightening screw shaft around its own axis. 14. The apparatus according to claim 13,
A device characterized in that it is equipped with a plurality of tightening screw shafts (26, 26', 26''), and the tightening screw shafts are distributed around the work spindle (4). 15. The device according to claim 13 or 14, wherein the tightening screw shaft (26, 26', 26'')
In whole or in part, both adjusting gears (11', 11"
) are connected to each other in opposite directions.
”). 16. The device according to claim 13, wherein the tightening screw shaft (26, 26', 26
The threaded socket (27) for the screw socket (
29), and this socket (29) has two stoppers (30, 30) in the output member (10).
') is mounted rotatably and axially immovably. 17. The apparatus according to claim 14 or 15, wherein the work spindle (4) is provided with a pair of tightening screw shafts (26', 26'') fixedly disposed in the circumferential direction. , pinions (28', 28'') as input members (12', 12'') for the motion conversion system (9), respectively.
, in which case the first clamping screw shaft (26') of the pair of clamping screw shafts has its own pinion (28') aligned with the gear rim (15') of one of the adjusting gears (11'). ), and the second tightening screw shaft (26”) has its own pinion (28”
) engages the gear rim (15) of the other adjusting gear (11"), and both of these tightening screw shafts (26', 26") are connected via another pinion connection member (14"). They engage each other in opposite directions, and further have tightening screw threads (27').
have mutually opposite thread directions. 18. A device according to claim 11, 12 or 15, in which the tightening screw shaft (26) is attached to the center pin (1).
4'). 19. The device according to claim 8, wherein the braking device comprises a respective adjusting gear (1
1', 11''), in particular a shoe brake or an axial (disc) brake with an adjusting gear configured as a brake plate. 20. The device according to claim 8, wherein each adjusting gear (11', 11''
) includes an adjusting gear as a rotor and an excitation coil (31) surrounding this adjusting gear.
a stator ring (32', 32'') having a
A device configured as an induction machine that functions as a brake, and characterized in that the magnitude of the excitation current in this excitation coil can be controlled. 21. The apparatus according to claim 20, comprising:
A device characterized in that the induction machine is configured as an eddy current brake. 22. The device according to claim 19, wherein the braking device (32) comprises a measuring device for the magnitude of the braking moment applied to the adjusting gear (11', 11''). A device characterized in that it has a device. 23. The device according to claim 1, wherein the output member (10) of the motion conversion system (9)
) and the adjustment rod (8), a power transmission member is inserted, and this member transmits power in the axial direction between the output member (10) and the adjustment rod (8) within a predetermined range. A device for allowing a relative movement of the two, wherein the magnitude of the force transmitted between the two depends on the relative displacement distance between the two. 24. The apparatus according to claim 25,
Device characterized in that the power transmission member is formed by a spring element (100), which supports the output member (10) in both axial directions on the adjustment rod (8).