JP2864284B2 - Machine tool clamping device - Google Patents

Description

The present invention relates to a clamping device for a machine tool.

[Prior Art and Problems to be Solved by the Invention] The following machine tool clamping device is applied for a patent in West Germany.
Known from 3117850A1. That is, a rotating cylinder, a piston disposed so as to be able to move in the cylinder in an interlocking manner and move in the axial direction, and a feeder,
The delivery device comprises a delivery shaft connected to the piston and capable of moving axially in the wall of the cylinder, and a delivery casing disposed on the delivery shaft and having a port for a working medium, A supply shaft rotatable in the supply casing is a clamping device of a machine tool for interlocking the supply casing when the piston moves in the axial direction, and a holding member is guided to the supply casing so as to be movable in the axial direction. The cylinder further includes a control device for axial movement of the piston, the control device comprising at least one control piece held by the holding member and at least one controller held by the supply casing and driven by the control piece. On the other hand, a bearing having a bearing outer ring that is coaxial and rotatable but is immovable in the axial direction is attached to the cylinder, and the holding member is held by the bearing outer ring. There are those in which relative movement in the axial direction relative to the cylinder is constrained so as not to cause the bearings.

In this clamping device, the holding member is composed of an unevenly smooth moving body, which travels in a notch of the guide body provided in the supply casing. The cylinder-side end of this unevenly-smooth moving body is fixed to a ring that is divided into two by a central plane in the radial direction. The two parts of the ring are fastened in the axial direction by screws, each one annular shoulder covering the bearing outer ring in the radial direction. As a result, the bearing outer race is securely tightened between the annular shoulders. The above arrangement is not only wasteful with respect to the configuration of the longitudinal guide for the holding member, but also strictly defines the radial distance from the central axis of the supply shaft to the longitudinal guide of the holding member to the diameter of the bearing outer ring. Needs adjustment to match. This adjustment consists in that instead of a bearing arranged in the cylinder for the holding element, a roller is mounted rotatably guided on a cylinder bearing surface surrounding the cylinder in an annular manner, the bearing surface being the annular groove flank of the cylinder. In the other examples known from the above publications, the need is certainly obviated. However, in this configuration, the smaller the play between the roller and the groove flank, the greater the friction loss between the roller and the groove flank. Also, where it is required to minimize this play, accurate control of the piston movement should be ensured.

The problem underlying the present invention is to provide such a clamping device for a machine tool, which enables a precise control of the piston movement with a simple design and manufacturing technology.

According to the present invention, the holding member guided by the supply casing comprises at least one guide rod running in the axial direction, and the guide rod is provided in the radial direction. A coaxial guide hole is provided in each guide extension formed in the supply casing which is held on the bearing outer ring so as to be movable and is spaced apart from each other in the axial direction, and a guide rod is inserted through these guide holes. This solves the problem. The guide rod may directly hold the control piece.

According to the configuration described above, not only is the structure of the longitudinal guidance of the holding member particularly simple for manufacture and assembly, but this holding member is also very advantageously connected to the bearing outer ring.
That is, since relative movement in the radial direction between the guide rod and the bearing outer ring is possible, the adjustment is automatically performed so that the distance from the center axis of the supply shaft to the guide rod matches the diameter of the bearing outer ring. At this limit, there is no need for unnecessary accuracy requirements during manufacturing and assembly.

In a preferred embodiment of the present invention, two flanges are provided at the end of the guide rod on the cylinder side, and the bearing outer ring is received between the flanges so as to be axially connected and movably in the radial direction. It is characterized by the following. At this time, one flange abutting the bearing outer ring on the supply casing side is configured as an annular flange provided coaxially on the guide rod, and this annular flange is guided by the guide rod so as to be movable in the axial direction. , Is preferably pressed against the bearing outer ring by a spring. It is preferable to adopt a configuration in which the annular flange is pressed against the bearing outer ring by a spring, because axial play between the holding member and the bearing outer ring is easily eliminated. If the guide rod is provided with an annular shoulder which prevents movement of the annular flange by the action of the spring, the guide rod can be inserted through the annular flange in advance. Moreover, according to another proposal of the present invention,
The spring is a disc spring, which is supported by a retaining ring which engages the annular groove of the guide rod. In this case, it is particularly easy to pre-assemble the annular flange to the guide rod.

Suitably, the cross-section of the retaining member or guide rod is circular, the guide rod comprising a pin between the two flanges, which pin engages radially in a notch provided in the bearing outer ring. The rotation of the bearing outer ring with respect to the guide rod is prevented. At this time, the notch of the outer race of the bearing, that is, a bore that is easy to manufacture becomes a guide hole for the holding member. Rotation of the control piece relative to the controller is also prevented.

The control piece is preferably embodied as a control ring which can be moved axially on the guide rod, and the control ring can be fixed on the guide rod with an adjusting screw guided radially in the control ring. In this case, a plurality of controllers can be arranged offset around the guide rod or the control ring. In this regard, it is further preferred that the delivery casing for holding the controller comprises a hood covering the guide rod. In this case, it is particularly advantageous to provide a slit-shaped mounting hole running parallel to the direction of movement of the guide rod in the wall of the hood, along which the controller allows the two guide extensions to extend. And the controller can be fixed to the edge of the slit-shaped mounting hole. The ability to move the control pieces and controllers in the axial direction, and the possibility of arranging multiple control pieces on the guide rod and multiple controllers on the hood make it possible to set all tasks in a very wide range of fields. Piston motion control that can be easily adapted can be realized. It is also preferred that a plurality of guide rods and a corresponding plurality of sets of guide extensions are distributed around the supply casing. In this case, the ends of the guide rods projecting beyond the supply casing on the side opposite to the cylinder in the axial direction may be interconnected by a plate, the cylinder having an unobstructed through-hole, a rod-shaped The plate is configured as a carrier for a stopper rod that projects axially into the hollow delivery shaft to form a stop for the workpiece.

EXAMPLES Hereinafter, the present invention will be described in detail with reference to examples shown in the drawings.

Illustrated cylinder 1 for clamping device of machine tool
Includes a cylinder casing 3. The piston 2 is movable in the cylinder casing 3.
Can be connected to a fastening rod, not shown. Usually, a cylinder casing 3 is attached to an end of a machine tool spindle (not shown) and rotates together with the spindle including the piston 2.

The cylinder 1 is provided with a supply / distribution device indicated by reference numeral 4 as a whole. The delivery device 4 comprises a delivery casing 5 which does not rotate in conjunction with the cylinder 1, the delivery casing 5 having a side port 6 for the working medium for operating the cylinder 1. The supply shaft 7 arranged in the supply casing 5 via the bearings 8 and 9 rotates in the supply casing 5. One of the bearings 9 is a shoulder of the supply shaft 7 in the axial direction.
The other bearing 8 bears against the retaining ring 11 on the opposite side, so that the delivery casing 5 is held on the delivery shaft 7 so as not to move in the axial direction. The supply shaft 7 is integrally connected to the piston 2 and slides axially with respect to the wall of the cylinder 1. As a result, the movement of the piston 2 in the axial direction is directly transmitted to the supply casing 5 via the supply shaft 7.

Annular grooves 12, 13 communicating with the working medium port 6 and serving to supply and discharge the working medium are provided on the inner peripheral surface of the supply casing 5. The working medium passing between the supply shaft 7 and the supply casing 5 is collected in a path 14 and discharged through a connection 15. Two supply / discharge paths 18 and 19 communicating with the cylinder 1 on both sides of the piston 2
Are provided on the supply / distribution shaft 7, and these supply / discharge paths 18, 19 are provided.
Are connected to the annular grooves 12 and 13. Since the control of the working medium for selecting one of the two sides of the piston 2 through the supply / discharge paths 18 and 19 is performed as usual, detailed description is omitted.

For the control of the axial movement of the piston 2, a control device is provided which comprises a plurality of controllers 20, for example contact switches, and one control piece 21 for the operation of these controllers 20. The controller 20 is connected to the supply casing 5 and participates in its axial movement.

Further, as shown in FIG. 1 and FIG.
, The guide rod 29 carrying the control piece 21 is guided so as to be able to move in the axial direction during the longitudinal guide. The guide rod 29 is axially fixed to the cylinder 1 by the annular ball bearing 24. For this purpose, the cylinder 1 has an annular flange 23 on the front side on the feeder 4 side, and the annular ball bearing 24 coaxial with the cylinder 1 is arranged on the annular flange 23.
The annular ball bearing 24 has a bearing outer ring 22 that can rotate relative to the cylinder 1 and cannot move in the axial direction. Specifically, the bearing 24 is mounted on the annular flange 23 between the annular shoulder 25 and the retaining ring 26. The guide rod 29 is provided with two flanges 27 and 28 at the end on the cylinder 1 side at an axial distance from each other, and the bearing outer ring 22 is formed between the flanges 27 and 28 in the axial direction. They are connected and movably engaged in the radial direction.

The guide rod 29 is prevented from rotating by the cylinder 1 by the longitudinal guide in the supply casing 5.
In particular, two guide extensions 32 formed on the supply housing 5 for forming a longitudinal guide for the guide rod 29.
These guide extensions 32 each have a guide hole 31 for receiving a guide rod 29. These guide holes 31
Has a circular cross section similarly to the guide rod 29 itself.

The flange 27 that contacts the bearing outer ring 22 on the cylinder 1 side is
The guide rod 29 is configured as a coaxial front flange which limits one end of the guide rod 29, and is fixed to the guide rod 29. The flange 28 which abuts on the bearing outer ring 22 on the supply casing 5 side is formed as an annular flange, is guided on a guide rod 29 so as to be movable in the axial direction, and is pressed against the bearing outer ring 22 by a spring 30. The guide rod 29 has an annular shoulder 34 which prevents the movement of the flange 28 by the action of the spring 30, a retaining ring 35 is engaged in the annular groove of the guide rod 29, and the spring 30 configured as a disc spring is stopped. ring
It is axially supported at 35. Due to the spring-biased pressure on the flange 28, the bearing outer ring 22 is connected to the guide rod 29 in the axial direction without play. The guide rod 29 is provided with a pin 36 between the flanges 27 and 28, and the pin 36 engages with a pocket-shaped notch 37 provided in the bearing outer ring 22 in the radial direction, so that the bearing outer ring 22 Rotation is blocked.

The control piece 21 is a control ring that can move on the guide rod 29 in the axial direction. An adjusting screw 38 is guided radially in the control ring, with which the control ring can be fixed in a desired position on the guide rod 29. Needless to say, a plurality of control pieces 21 may be provided along the guide rod 29. A hood 39 is fixed to the side flange surface 41 of the supply casing 5 with screws 42 for holding the controller 20, and the hood 39 covers the guide rod 29 from the upper end to the side. On the wall of the hood 39, there is a guide rod 29
Are provided with a plurality of slit-shaped mounting holes 40 traveling in parallel to the direction of movement. The controller 20 can be moved between the two guide extending portions 32 along the slit-shaped mounting hole 40 and can be fixed to an edge of the slit-shaped mounting hole 40 by a fastening nut 43. The hood 39 is formed of band-shaped planar wall regions that are inclined with respect to each other so as to form a cavity having a polygonal cross section, and a slit-shaped mounting hole 40 is attached to each band-shaped wall region. That is, the angular position of the controller 20 around the guide rod 29 is determined by the area of each band-shaped wall area of the hood 39. The embodiment shown in FIG. 3 and FIG.
1 and 2 in that a plurality of guide rods 29, that is, a total of three guide rods, are distributed around the supply casing 5. FIG. Through both embodiments,
Two guide extending portions 32 each having a guide hole 31 are provided for each guide rod 29. If a plurality of hoods 39 are provided as carriers for the controller 20 corresponding to the guide rods 29, each guide rod 29 movably connected in the radial direction to the bearing outer ring 22 serves as a carrier for the control piece 21. Can play a role. However, FIGS. 1 and 2
Like the embodiment of the drawing, the embodiment of FIGS. 3 and 4 also shows only one guide rod 29.

3 and 4 further show the cylinder 1 in the axial direction.
On the opposite side, the ends of the guide rods 29 projecting beyond the supply casing 5 are interconnected by a plate 50 which passes through a central opening and an annular chuck 51 for a stop rod (not shown). Is shown as a carrier. If the cylinder has an unobstructed through-hole for machining a bar-shaped workpiece as in this embodiment, the stopper rod is
It may project axially inward to form a stop for the workpiece.

As shown in FIG. 3 and FIG.
If they are fixedly connected to each other, the axial movement of all other guide rods 29 can be prevented by connecting only one guide rod 29 to the bearing outer ring 22.

[Effects of the Invention] As described above, in the machine tool clamping device according to the present invention, the holding member guided by the supply casing includes at least one guide rod that travels in the axial direction,
The guide rod is held on the bearing outer ring so as to be movable in the radial direction, and a coaxial guide hole is provided in each guide extension formed in the supply casing at a distance from each other in the axial direction. The insertion of these guide holes not only makes the structure of the longitudinal guidance of the holding element particularly simple for manufacture and assembly, but also makes this holding element very conveniently connected to the bearing outer ring. That is, since relative movement in the radial direction between the guide rod and the bearing outer ring is possible, adjustment is automatically performed so that the distance from the center axis of the supply shaft to the guide rod matches the diameter of the bearing outer ring, Eliminating useless precision requirements during manufacturing and assembly.

One flange abutting the bearing outer ring on the supply casing side is configured as an annular flange provided coaxially on the guide rod, and the annular flange guided axially movably on the guide rod by a spring is used as the bearing outer ring. , The axial play between the holding member and the bearing outer ring is easily eliminated. If the guide rod is provided with an annular shoulder for preventing movement of the annular flange by the action of the spring, the guide rod can be inserted through the annular flange in advance. In addition, when the spring is a disc spring and the disc spring is supported by a retaining ring that engages with the annular groove of the guide rod, it is particularly easy to pre-assemble the annular flange to the guide rod.

The cross-section of the retaining member or guide rod is circular, the guide rod comprising a pin between the flanges, which pin engages in a radial direction with a notch provided in the outer race of the bearing and provides a bearing for the guide rod. When the rotation of the outer race is prevented, the notch in the outer race of the bearing, that is, a bore that is easy to manufacture serves as a guide hole for the holding member, and the rotation of the control piece with respect to the controller is also prevented.

The supply casing includes a hood that covers the guide rod, and a slit-shaped mounting hole that runs parallel to the direction of movement of the guide rod is provided on a wall of the hood, and the controller extends both guides along the slit-shaped mounting hole. It is possible to move between the outlets,
If the controller can be fixed to the edge of the slit-shaped mounting hole, the control piece and the controller can be moved in the axial direction, and the arrangement of the plurality of control pieces on the guide rod and the hood can be performed. The possibility of arranging a plurality of controllers makes it possible to realize a piston movement control which can be easily adapted to all task settings in a very wide variety of ways.

[Summary] The present clamping device includes a rotating cylinder (1) and a feeder (4). The feeder (4) includes a feed casing (5) having a port for a working medium, and a piston ( 2)
And a supply shaft (7) that can move in the axial direction together with the piston. The supply shaft (7) interlocks the supply casing (5) when the piston (2) moves in the axial direction. The control of the axial movement of the piston (2) is by means of at least one control piece (21) and at least one controller (20) which can be driven by this control piece. The guide rod (29) is guided to the supply casing (5) movably in the axial direction, and the guide rod (29) is axially fixed to the cylinder (1) by a bearing (24). The control piece (21) is held on a rod (29) (FIG. 1).

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a clamping device of a machine tool according to an embodiment of the present invention including a cylinder distributor and a control device, FIG. 2 is a cross-sectional view of the clamping device of the preceding figure, FIG. FIG. 4 is a longitudinal sectional view corresponding to FIG. 1 of a clamp device according to another embodiment of the present invention, and FIG. 4 is a transverse sectional view corresponding to FIG. 2 of the clamp device of the preceding figure. DESCRIPTION OF SYMBOLS 1 ... Cylinder, 2 ... Piston, 4 ... Distributor, 5 ...
... supply casing, 6 ... port, 7 ... supply shaft, 20 ...
... Controller, 21 ... Control piece, 22 ... Bearing outer ring, 24 ... Circular ball bearing, 27,28 ... Flange, 29 ... Guiding rod, 30 ...
… Spring, 31… guide hole, 32… guide extension, 34… annular shoulder, 35… retaining ring, 36… pin, 37… notch, 38
…… Adjustment screw, 39 …… Hood, 40 …… Slit-shaped mounting hole, 50 …… Plate.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B23B 31/02, 31/30 B23Q 17/00

Claims (12)

(57) [Claims] 1. A cylinder (1) that rotates, a piston (2) that is interlockingly rotated in the cylinder (1) and is disposed so as to be movable in an axial direction, and a feeder (4), The delivery device (4) is connected to the piston (2) and is capable of moving axially in the wall of the cylinder (1);
A feed casing (5) disposed on the feed shaft (7) and having a port (6) for a working medium, the feed shaft (7) being rotatable in the feed casing (5). Is a machine tool clamping device for interlocking the supply casing (5) when the piston (2) moves in the axial direction, wherein the holding member is guided in the supply casing (5) so as to be movable in the axial direction, A piston (2) comprising at least one control piece (21) held on a member and at least one controller (20) held on a supply casing (5) and driven by the control piece (21). A control device for axial movement is further provided, and the bearing outer ring (2) is coaxial and rotatable with respect to the cylinder (1) but is not movable in the axial direction.
A bearing (24) having 2) is attached to the cylinder (1), and the holding member is held by a bearing outer ring (22). The holding member is moved relative to the cylinder (1) in the axial direction by the bearing (24). In a clamping device for a machine tool which is constrained so as not to cause the above, the holding member comprises at least one guide rod (29) running in the axial direction, and the guide rod (29) is movable in the radial direction. A coaxial guide hole (31) is provided in each guide extension (32) formed in the supply casing (5) which is held by the bearing outer ring (22) and is spaced apart from each other in the axial direction. A clamp device for a machine tool, wherein (29) is inserted through these guide holes (31). 2. The machine tool clamping device according to claim 1, wherein the guide rod (29) directly holds the control piece (21). 3. A flange (27, 28) is provided at an end of the guide rod (29) on the cylinder (1) side, and the guide rod (29) is provided between these flanges (27, 28). 3. The bearing outer ring (22) is axially engaged with the bearing outer ring (22) to receive the bearing outer ring (22) movably in the radial direction.
2. The clamping device for a machine tool according to 1. 4. The bearing outer ring (22) on the side of the supply casing (5).
Is formed as an annular flange coaxially provided on the guide rod (29), and this annular flange is guided by the guide rod (29) so as to be movable in the axial direction, and a spring ( The clamping device for a machine tool according to claim 1, wherein the clamping device is pressed against the bearing outer ring (22) by 30). 5. The guide rod (29) according to claim 4, wherein an annular shoulder (34) for preventing movement of said one flange (28) by the action of a spring (30) is provided. Clamping device. 6. The spring according to claim 4, wherein said spring is a disc spring, said spring being supported by a retaining ring engaging said annular groove of said guide rod. Or the clamping device for a machine tool according to 5. 7. A guide rod (29) having a circular cross section is provided with a pin (36) between both flanges (27, 28).
Are engaged with notches (37) provided in the bearing outer ring (22) in the radial direction to prevent rotation of the bearing outer ring (22) with respect to the guide rod (29). 7. The clamping device for a machine tool according to any one of 6. 8. The control piece (21) is embodied as a control ring which can be moved axially on a guide rod (29), with a control screw (38) guided radially in the control ring. 8. The clamping device according to claim 2, wherein the control ring can be fixed on the guide rod. 9. A housing according to claim 1, wherein the supply casing has a hood covering the guide rod for holding the controller. A clamping device for a machine tool according to any one of the preceding items. 10. A slit mounting hole (4) running parallel to the moving direction of the guide rod (29) in the wall of the hood (39).
0) is provided, and the controller (20) is movable between the two guide extending portions (32) along the slit-shaped mounting hole (40). 10. The clamping device for a machine tool according to claim 9, wherein the controller (20) can be fixed to an edge of the machine tool. 11. A delivery casing (5) comprising a plurality of guide rods (29) and a corresponding plurality of sets of guide extensions (32).
2. The device according to claim 1, wherein the device is arranged around the device.
The clamp device for a machine tool according to any one of claims 1 to 10. 12. A plurality of guide rods (29), said guide rods (29) being arranged in the cylinder (1) in the axial direction.
On the opposite side, the ends projecting beyond the supply casing (5) are interconnected by a plate (50), the cylinder (1) having an unobstructed through-hole and a hollow supply shaft ( 2. The clamping device for a machine tool according to claim 1, wherein the plate is configured as a carrier for an axially projecting stopper rod in 7).