JPS6337020B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a chuck mandrel for mounting a bobbin, which comprises a holding arm fixed in a cantilever manner to a machine frame, and a holding tube rotatably supported on the holding arm. , a mantle sleeve concentrically fixed to the holding tube and forming a ring chamber therebetween; a plurality of circumferentially distributed expandable securing members disposed in a ring chamber between the mantle sleeve and the retaining tube and radially movable through an opening in the mantle sleeve; The bobbin is supported by the outer circumferential surface of the tube and the expandable fixing member supports the inner circumferential surface of the bobbin, so that the bobbin is expanded and fixed to the chuck mandrel.

Various methods and devices are known for securely locking a bobbin onto a chuck mandrel shaft. Widely used are chucks in which there is an axially movable cone on the chuck shaft, which cone is movable relative to a corresponding cone. In this case, the corresponding cone is moved radially outwards by displacing the first cone to tighten the bobbin.

This arrangement has the disadvantage that there must be a slip fit between the chuck shaft and the cone. The fabrication of this slip fit must be carried out with great precision. Otherwise, locking and rusting would occur in the sliding fit after only a relatively short operating time, rendering the entire chuck shaft unusable. On the other hand, when the chuck mandrel is rotated in one direction of rotation, the expansion fixing member fixes the bobbin holder to the chuck mandrel, and when the chuck mandrel is rotated in the other rotation direction, the expansion fixing member fixes the bobbin holder to the chuck mandrel. Chuck shafts are known which operate on the so-called coaster principle, in which the bobbin holder is released from the chuck mandrel. (See DE 2106493, DE 2202009 (U.S. Pat. No. 3,815,836)). The expandable fixing element used in this chuck shaft has the advantage of reliably fixing the bobbin even when high rotational or braking moments are applied. This is because in this case, the expansion fixing member has a self-locking effect.

The bobbin is inserted and removed by manually moving the bobbin axially and simultaneously rotating it. If several bobbins are arranged axially one after the other on the chuck mandrel, the last bobbin must be guided beyond all previous extended fixation ranges during insertion and removal. Must be. For this purpose, it is necessary to provide additional rotational motion to the bobbin at all times.

The object of the invention is to eliminate the above-mentioned known drawbacks without adversely affecting the expansion fixation force.

The object of the present invention is to improve the chuck mandrel mentioned at the beginning, in that a ring piston is disposed in each of the planes extending perpendicularly to the chuck mandrel axis, and the ring piston is connected to the jacket sleeve. The ring piston is airtightly disposed in a ring chamber between the holding tube and is movable in the axial direction, and the ring piston receives a spring force and applies an axial force to the expansion fixing member to expand and fix it. The solution is that it can be moved against a spring force by being loaded with air. This solution has the advantage that it can be placed on any chuck mandrel. Additional special aids are therefore not required for the insertion and removal. Also, in this case it does not matter whether the insertion and removal are carried out by hand or by machine.

The claims 2 and 3 describe two advantageous expansion fixing principles that can be used in the chuck mandrel according to the invention. In this case, the drive device according to the invention is particularly suitable for use in conjunction with an expansion locking element (claim 2) which operates according to the coaster principle. This is because it is time consuming and impractical to move the bobbins over the chuck mandrel by continuous rotational and axial movements, especially when a plurality of bobbins are fitted onto the chuck mandrel. This is because it has been confirmed that this is not the case. Moreover, in this case, the expansion fixation force of the expansion fixation element is not adversely affected by the design according to the invention, so that the advantage of this expansion fixation element acting independently of external forces is fully exploited.

Claim 3, on the other hand, describes other types of expansion fixation members that can be used with the drive device of the invention. This expansion fixation member is extremely simple to manufacture.

The expansion locking force of this expansion locking element is dependent on the spring force and is therefore automatically adjusted during operation - even if the shape of the bobbin changes. In this case, the nose on the one hand creates a connection with the drive, and on the other hand - when the bobbin is not inserted - acts as a stop that acts for the protrusion of the expansion locking element and for releasing the expansion lock. used. As a result, the functionality of the expansion fixing element is always guaranteed in a simple manner.

Due to the fact that the expandable fixing element is directly supported on the holding tube, the holding tube itself can be constructed completely cylindrical. Furthermore, this - unlike known chuck mandrels - requires fewer components to be moved during expansion fixation and release, making the chuck mandrel cheaper to manufacture and increasing the safety of the chuck mandrel. do.

In order to simplify the chuck mandrel and increase its functionality, it is advantageous to arrange the expansion fixing elements belonging to one expansion fixation site in one holder (claim 4). By this 1
All expansion members of one expansion fixation site are activated simultaneously and uniformly. Therefore, the bobbin is expanded and fixed concentrically with respect to the chuck mandrel axis.

In particular, a drive device for driving the expansion fixing member as defined in claim 3 is shown in claim 5. This structure has the advantage that only translational movements are provided in the drive unit. This is technically easier than providing rotational motion. The necessary rotary movement is achieved by the construction of the drive unit itself.

Furthermore, patent claim 6 describes an advantageous construction in terms of manufacturing technology, which serves to convert a translational movement of the feed member into a rotational movement.

The drive unit can be operated electrically, pneumatically or hydraulically.

Furthermore, the patent claim 7 indicates an advantageous assignment of the drive device to the expansion fixing element.

Furthermore, a chuck mandrel is shown in which the drive unit is actuated by pressure medium in a simple and advantageous manner. This has the advantage that there is no need to use non-wearing sealing elements. Sealing is carried out only when necessary, ie only when the bobbin is stationary.

Furthermore, claims 9 and 10 disclose an embodiment of a sealing member that is operated by compressed air in the same way as the drive device.

Furthermore, the fact that the supplied compressed air is distributed by means of throttles has the effect of retarding the build-up of pressure in both distribution channels. This delaying effect is advantageously utilized in order to first activate the sealing element. This reliably avoids leakage and ensures that all expansion locking members of the chuck mandrel are actuated simultaneously.

In chuck mandrels with a central drive, an advantageous further arrangement of the sealing element is obtained by the embodiment described in claim 11. An advantageous embodiment of this sealing material is specified in claim 12.

In order to prevent the support member that rotatably supports the holding tube on the holding arm from losing its lubricating film due to the supply of pressurized air, compressed air is added to the ring chamber as described in claim 13. It is advantageous to arrange channels for conducting air. On the one hand, this eliminates the need for the compressed air to flow through the bearing before reaching the individual cylindrical chambers.

The invention will now be explained with reference to the drawings: FIG. 1 shows one of the chuck mandrels according to the invention.
FIG. 2 is a cross-sectional view of the embodiment in the axial direction. In this case only the machine side and front end of the chuck mandrel is shown. In this embodiment, the chuck mandrel itself is not drivable. The drive takes place on the outer circumference of the bobbin via drive or contact rollers. However, it is also conceivable to drive the chuck mandrel itself with its own drive device (third
figure). A holding arm 2 is fixed to the machine frame 1 in a cantilevered manner. A holding tube 3 is rotatably mounted on the holding arm 2 via a support member 5. A jacket sleeve 14 is concentrically fixed to this holding tube 3. A ring chamber is formed between the jacket sleeve 14 and the holding tube 3, and an expansion fixing member 7 forming an expansion fixation point 6 for expanding and fixing the bobbin to the chuck mandrel is arranged in this ring chamber. There is. This expansion locking member 7 is radially movable through an opening in the mantle sleeve 14, and a bobbin (not shown) is attached to the expansion locking member 7.
is supported on the outer circumferential surface of the holding tube 3, and the expandable fixing member 7 supports the inner circumferential surface of the bobbin, thereby being expanded and fixed to the chuck mandrel. Between the holding arm 2 and the holding tube 3 there is a ring gap 4 over the entire length of the holding tube 3. This ring gap 4 has a plurality of radially arranged communication channels 4.
1 to the distribution channel 4.2. According to the embodiment of the invention, the communication channel 4.1 is always arranged before and after the bearing part 5. This prevents the lubricant of the bearing part from being carried away by air entering from one side of the bearing part.

Expansion fixing points 6 are arranged on the outer periphery of the chuck mandrel at a plurality of axially spaced locations. Since the expansion fixing points 6 hold the bobbins, the number and arrangement of the expansion fixing points 6 are determined by the bobbins used and their number.

The expansion fixing point 6 consists of a cylindrical expansion fixing member 7. 1 expansion fixing point each 6
The expansion fixing element 7 belonging to the holder 8 is held with a radial play in the holder 8.

In the region of the expansion fixing point 6, the outer circumference of the holding tube 3 is designed in a serrated manner, and the expansion fixation takes place according to the coaster principle. In other words, by rotating the retainer that holds the expansion fixing member by a predetermined angular range, the expansion fixation member configured as a roller moves upward along the slope, and the expansion fixation member moves to a larger radius position. This expands and fixes the bobbin. When the retainer is rotated in the opposite direction, the expansion fixing member rolls downward on the slope,
The expansion locking member is brought over a small radius, thereby releasing the expansion lock of the bobbin and allowing the bobbin to be installed and removed.

A cylindrical ring piston 9 is mounted on one side of the retainer 8.
acts, and this ring piston 9 is guided by the guide member 10.
via which it is guided into the helical groove 10.1.
This spiral groove 10.1 is arranged at a predetermined angle with respect to the circumferential direction. Torsion spring 1
1 holds each expansion locking member 7 in the expansion locking position via the ring piston 9. spiral groove 1
The inclination of 0,1 and the direction of inclination are chosen in such a way that the ring piston operates the expansion locking member 7 against the force of the torsion spring 11 for the purpose of unclamping the bobbin. The fixing hole of the torsion spring 11 is a communication passage 1 from the ring gap 4 to the cylindrical spring chamber 13.
Used as 2.

According to the invention, the spring chamber 13, which serves as a cylindrical chamber for driving the ring piston 9, is closed in the radial direction by a jacket sleeve 14. This jacket sleeve 14 consists of individual sleeve sections whose total length corresponds to the total length of the chuck mandrel. The individual sleeve sections are assembled at the expansion locking element 7 in such a way that the expansion locking element 7 can be pivoted unhindered. In the axial direction, the spring chamber 13
is limited by another ring piston 9'. If this is not possible due to the axial spacing of the individual expansion fixation points being too large, it is also possible to use a stationary ring 25 (FIG. 3).

At the machine end of the chuck mandrel and at its opposite end, the ring gap 4 can be closed by a further ring piston 17. This ring piston 17 is movably arranged on the machine frame 1 or on the holding arm 2 and carries in each case an O-ring 19 at its front end. When the ring piston 17 is moved toward the end surface of the holding tube 3, it comes into contact with the end surface of the holding tube with the O-ring 19, thereby sealing the ring gap 4 from the outside. This annular piston 17 is supplied with pressure medium via a bore 4.3, which is conveyed from a supply channel 4.4 into a ring-shaped cylindrical chamber 18. ring piston 1
7 are each held by one disc spring 21 in the starting position connecting the ring gap 4 with the outside.
The transition between supply channel 4.4 and distribution channel 4.2 is formed by a restriction 20.

FIG. 2 is a plan view showing a part of the mantle sleeve in section on the chuck mandrel. In this case, it is shown how the ring piston 9 is guided in the helical groove 10.1 by the guide element 10 and how the tone spring 11 is arranged and fixed. The illustrated expansion fixing element 7 is shown rotatable in a holder 8, which is rotated by a ring piston 9 via an axially movable driver.

The mode of operation of the chuck mandrel according to the invention will now be explained with reference to FIG. ing. Inserting a new bobbin or pulling out a wound bobbin is carried out with the chuck mandrel at rest.
Such an arrangement has the advantage that pressure medium only needs to be used to remove or insert the bobbin. During the winding operation, the expansion locking member 7 is kept in the expansion locking position by the holding tube being rotated with a delay relative to the bobbin.

Compressed air is introduced via the supply channel 4.4 in order to bring the expansion locking element 7, which is held in the expanded locking position via the torsion spring 11 in the stopped state, into the unlocked position. Due to the throttle 20, a pressure is initially built up in the cylindrical chamber 18. As a result, the ring piston 17 is moved toward the end face of the holding tube 3, and the ring gap 4 is sealed with the O-ring.

Air pressure is then also created in distribution channel 4.2 and communication channel 4.1. Since the bearing part 5 is loaded with compressed air from both sides, the escape of lubricant from the bearing part 5 is prevented. Furthermore, it is also possible to add lubricants to the compressed air. In this case, the bearing part 5 is simultaneously lubricated. This type of lubrication is extremely advantageous since the bobbin is changed before and after each winding process. The compressed air present in the ring gap 4 reaches the spring chamber 13 via the communication channel 12 . The ring piston 9 is then rotated via the guide element 10 by the helical groove 10, 1 due to the pressure that is built up in the spring chamber 13.

As a result, the expandable fastening element 7, which is configured as a roller, rolls against the direction of action of the torsion spring 11, so that the expandable fastening element 7 rolls downwards along the serrated step. The diameter is reached and the bobbin is released.

As long as compressed air is present in the distribution channel 4.2, the expansion locking member 7 is kept in the released position. When a new bobbin is fitted, the supply of compressed air is interrupted. Due to the spring 21, the ring piston 17 is pulled back again and the ring gap 4 is connected to the surroundings. This allows the distribution passage 4.2 and the communication passage 4.
1 and the pressure in the spring chamber 13 is reduced, and the expansion locking member 7 is rotated again to the expansion locking position by the torsion spring 11.

In FIG. 3, a chuck mandrel with a central drive is shown schematically. This central drive can be used as a drive or only for braking the rotating chuck mandrel. In the latter case, the chuck mandrel is driven via a drive roller.

Unlike the chuck mandrel shown in FIGS. 1 and 2, the chuck mandrel is connected to a drive shaft 22 located at the center of the holding arm 2 on the end surface side. This eliminates the front ring piston 17. In this type of arrangement, the bearing element 5 is connected to the distribution channel 4.2.
It is disposed between the drive shaft 22 and the holding arm 2 within. It is therefore necessary to seal the drive shaft in the machine frame 1 when introducing pressure medium into the distribution channel 4.2. For this purpose 2
A sealing member 23 consisting of two O-rings is arranged within the ring groove 24. This ring groove 24 is connected to a common channel 4.4 via one or more holes 4.5. Furthermore, in this embodiment, the spring chamber 1
The arrangement format in 3 is also different. Since the individual expansion fixing points have a large distance from each other,
The individual spring chambers 13 are no longer limited by two ring pistons, but one ring piston and one ring 2 arranged immovably on the holding tube 3.
5. Although in this case one ring 25 delimits the two spring chambers 13, it is also possible for each spring chamber 13 to have its own ring 25. In this case, the space occurring between the two rings or the two ring pistons in which the expansion fixation point 6 is not located, or the space occurring between the ring piston and the ring and belonging to two different expansion fixation points, is not utilized.

The structure and function of the individual expansion fixing points 6 are as shown in FIGS. 1 and 2. In this embodiment, too, the ring gap 4 is used if the expansion fixing member 7, which is configured as a roller, is to be rotated into a relaxed position.
is sealed, and additionally the distribution channel 4.2 must be sealed. Owing to the restriction 20, the air flowing into the supply channel 4.4 is first directed via the bores 4, 3 to the piston 17 and reaches the sealing element 23 via the bores 4, 5. The piston seals the ring gap 4. Seal member 2 by compressed air
3 is deformed, so that the sealing member 23 closes the gap between itself and the drive shaft 22. The provision of the ring groove 24 makes it impossible for the sealing member 23 to escape in a direction other than the intended direction.

Then, in this case as well, the compressed air passes through the distribution channel 4.
2. Communication passage 4.1, ring gap 4 and communication passage 1
2 to the spring chamber 13. The ring piston 9 then operates the expansion fixing member 7 in the expansion fixation release direction based on the spiral grooves 10,1 and the guide member 10.

The expansion locking member 7 is brought into the expanded locking position by cutting off the compressed air. As a result, the deformation of the seal member 23 is restored, and the piston 17
is returned by spring 21. As a result, the pressure generated in the spring chamber 13 and the passage is released, and the torsion spring 11 rotates the expansion locking member 7 again into the expansion locking position.

However, if an expansion fixation member operating on the coaster principle is not used, a fourth
The embodiments shown in the figures can also be used.

In FIG. 4, the holding arm 2, the air supply system 4.1 to 4.4, the piston 17 and the ring gap 4 are shown.
The sealing device is the same as the member shown in FIG. Moreover, the mode of action of these members is also completely the same. For this reason, the same parts are also given the same reference numerals, and a description of their function has been omitted.

In contrast to the expansion locking system shown in FIGS. 1 to 3, this embodiment has the ability to be brought into the expanded locking position by spring force and into the relaxed position by pneumatic forces. An expandable fixation member 26 is used.

The expansion fixation member 26 is approximately kidney-shaped and has a sickle-shaped sliding surface 27 . Expansion fixing member 26
contacts the holding tube 3 with this sliding surface 27 and passes through the opening 28 of the jacket sleeve 14 with its free end. The expansion locking member 26 is held in the expanded locking position by being spring-loaded at its other end via a freely movable ring 30. The ring 30 is common to all expansion fixation members 26 of one expansion fixation point 6.

A nose 29 is provided on the sliding surface 27,
Via this nose 29, the expansion fixing member 26 comes into contact with the ring piston 9'. The ring piston 9' runs between the jacket sleeve 14 and the holding tube 3.
This ring piston 9' also has one expansion fixing point 6.
This is common to all expansion fixing members 26. The end face of the ring piston 9' opposite the nose is held in the axial direction by a snap spring arranged in the holding tube 3 or in the jacket sleeve 14 so that it cannot move in the axial direction.

In order to relax the expansion fixing element - as already mentioned - compressed air is introduced into the spring chamber 13 via the supply channel 4.4, the channel 4.1, the ring gap 4 and the connecting channel 12. This causes the ring piston 9' to move in the axial direction. As a result,
Via the nose 29, the expansion fixing member 26 is moved against the spring force and is slid on the outer circumferential surface of the holding tube 3 on the sliding surface 27. As a result, the free end of the expansion fixation member 26 undergoes a controlled pivoting movement;
The free end of the expansion fixation member 26 is moved radially inwardly through the opening 28 . In order to prevent the expansion fixing member 26 from completely entering the opening 28, the nose 29 should be moved in a timely manner to the holding tube 3.
It is arranged so that it is supported by the outer peripheral surface of. The pivoting movement of the expansion locking element releases the contact between the inserted bobbin and the expansion locking element, and the bobbin can be withdrawn.

When the compressed air is cut off, the spring pushes the expansion locking element 26 of one expansion locking point 6 radially outwards again via the ring 30. When the bobbin is not inserted, the nose 29 prevents the expansion locking member 26 from falling out of the chuck through the opening 28. A plurality of springs can be distributed circumferentially and engaged with each ring 30 to obtain a uniform pushing movement of the expansion locking member.

In this embodiment, the ring 30 and the ring piston 9' are constructed as one component, which component can be provided with a recess for receiving the expansion fixing element. Such an arrangement is taken for the expansion fixation member on the right side of FIG. In this case, the ring 30 and the ring piston 9' are joined together to form a retainer for receiving the expansion fixing member. This holder simultaneously acts as a feed member of the drive. This minimizes the number of components required to actuate the expansion locking member.

[Brief explanation of the drawing]

The drawings show several embodiments of the invention, FIG. 1 being a schematic axial sectional view of a chuck mandrel with a circumferential drive, and FIG. 2 showing an expansion fixation of one expansion fixation point. 3 is a schematic axial sectional view of a chuck mandrel with a central drive; FIG. 4 is an axial sectional view of a variant embodiment of a chuck mandrel with a circumferential drive; FIG. 5 is a cross-sectional view of the chuck mandrel of FIG. 1 through the expansion fixation member; FIG. DESCRIPTION OF SYMBOLS 1... Machine frame, 2... Holding arm, 3... Holding tube, 4... Ring gap, 5... Support member, 6... Expansion fixing part, 7... Expansion fixing member, 8... Cage, 9... Ring piston, 10... Guide Member, 11... Torsion spring, 12... Communication passage, 13... Spring chamber, 14...
Mantle sleeve, 17...ring piston, 18...cylindrical chamber, 19...O ring, 20...diaphragm, 21...disc spring.

Claims (1)

[Scope of Claims] 1. A chuck mandrel for attaching a bobbin, comprising a holding arm 2 fixed in a cantilever manner to a machine frame, a holding tube 3 rotatably supported on the holding arm 2; A jacket sleeve 14 concentrically fixed to the holding tube 3 and forming a ring chamber therebetween, and a chuck in each of a plurality of planes extending perpendicularly to the chuck mandrel axis. It has a plurality of expanding fixing members 7 distributed in the circumferential direction of the mandrel and arranged in the ring chamber between the mantle sleeve 14 and the holding tube 3 and movable radially through the opening in the mantle sleeve 14. , in a type in which the expanding fixing member 7 is supported on the outer circumferential surface of the holding tube 3 and the expanding fixing member 7 supports the inner circumferential surface of the bobbin, so that the bobbin is fixed to the chuck mandrel. , 1 for each plane extending perpendicularly to the chuck mandrel axis in which the expansion fixation member 7 is arranged.
Two ring pistons 9, 9' are arranged,
The ring pistons 9, 9' are arranged airtight in the ring chamber between the jacket sleeve 14 and the holding tube 3 and are movable in the axial direction.
9' is configured to apply an axial force to the expansion fixing member 7 in response to a spring force for expansion and fixation, and to be moved against the spring force by being loaded with compressed air. A chuck mandrel for attaching the bobbin. 2. The outer periphery of the holding tube is configured in a sawtooth shape so that the expansion fixing member works on the coaster principle, and the ring pistons 9, 9' are movable in a screwed state with respect to the holding tube 3. Chuck mandrel as described in section. 3. The expansion fixing member 7 has an arc-shaped sliding surface 27, and the expansion fixing member 7 slides onto the holding tube 3 on this sliding surface 27.
The chuck mandrel according to claim 1, which is in contact with the sliding surface of the chuck mandrel. 4. Claim 1, wherein the expansion fixing members 7 arranged in the same plane extending at right angles to the chuck mandrel axis are arranged in a common retainer.
The chuck mandrel according to any one of Items 1 to 3. 5. The chuck mandrel according to claim 3, wherein the ring piston is configured as a retainer for the expansion fixing member 7. 6. Claims in which the threaded engagement between the ring pistons 9, 9' and the holding tube 3 consists of a guide member 10 fixedly arranged on the holding tube 3 and a groove arranged on the ring pistons 9, 9'. The chuck mandrel described in item 2. 7. The ring chamber is axially bounded by two opposed ring pistons 9, 9' which each extend perpendicularly to the chuck mandrel axis into two adjacent identical A chuck mandrel according to any one of claims 1 to 6, which actuates an expansion fixation member 7 arranged in a plane. 8 Compressed air is supplied from the machine frame to the supply passage 4.4
distribution channel 4 arranged in the holding arm 2 via.
2 and then via the communication channel 4.1 between the holding arm 2 and the holding tube 3.
and from there into the ring chamber via the hole 12, the ring gap 4 being sealed by a ring-shaped sealing member arranged coaxially with respect to the holding arm. The chuck mandrel according to any one of paragraphs 7 to 7. 9 A ring piston 17 movable in parallel to the axis of the machine frame is used as a sealing member,
This ring piston 17 has at its free end an elastic sealing ring 19, which sealing ring 1
9. A chuck mandrel according to claim 8, wherein the chuck mandrel 9 cooperates with the end face of the holding tube 3. 10. The chuck mandrel according to claim 8 or 9, wherein a constriction point is arranged between the supply passage and the distribution passage, and compressed air is supplied to the sealing member via the supply passage. 11 A drive shaft in the center of the holding tube is used, which drive shaft is fixedly connected to the holding tube at its free end, and the distribution channel is opened at the machine end of the drive shaft by means of compressed air. Claim 8 is sealed via an actuated sealing member.
The chuck mandrel according to any one of paragraphs 1 to 10. 12. Claim 11, in which one or two O-rings are used as sealing elements, which O-rings are loaded with compressed air from behind in the groove and through a hole connected to the supply channel. Chuck mandrel as described in section. 13. Claims in which the compressed air loading the ring pistons 9, 9' is supplied to the ring chamber via passages arranged on both sides of the support member 5 rotatably supporting the holding tube 3 on the holding arm 2 The chuck mandrel according to any one of paragraphs 1 to 12.