JP2017527503A - Chuck - Google Patents

Abstract

The present invention relates to a winder chuck for receiving and fixing a winding tube (32). The winding tube is held around the tightening bush (1) via the clamping device (5), and the clamping device (5) is relaxed using the compressed air supply unit. The compressed air is then supplied via a ring chamber (14) formed between the clamping bush (1) and the shaft support (2), which ring chamber (14) is connected to the clamping bush (1). In the open end surface portion, air can be discharged through a peripheral wall opening (18) formed between the shaft support (2) and the tightening bush (1). A seal piston (21) is arranged corresponding to the peripheral wall opening (18). The seal piston (21) is formed to be movable along the shaft support (2). It acts on the sealing surface (20) of the clamping bush (1). In particular, in order to compensate for misalignment between the clamping bush (1) and the shaft support (2), according to the invention, the sealing piston (21) is placed on the end face (19) of the clamping bush (1). A centering addition part (23) is provided on the end face that is directed, and the centering addition part (23) enters the clamping bush (1) when the sealing piston (21) contacts the sealing surface (20). To do.

Description

  The present invention relates to a winder chuck described in the first stage of claim 1 for accommodating and fixing a winding tube and winding a yarn to form a package.

  Such a chuck of a winding machine is known, for example, from DE 19607916 (DE 196 07 916 A1).

  Such chucks are preferably used in winders that wind freshly spun synthetic yarn to form a package. For this purpose, a plurality of winding tubes are fitted on a chuck arranged so as to protrude from the winding machine. In order to tighten the winding tube, the chuck has a clamping device, which has a plurality of clamping elements that can be guided radially outward. The clamp device is incorporated in a tightening bush held by the shaft support, and at this time, the shaft support enters the tightening bush. Since the clamping bush is further driven and held at a distance from the shaft support, an annular ring chamber is created between the shaft support and the clamping bush.

  The clamping device formed on the clamping bush has a plurality of clamping elements, which are arranged between the spring and the pressure chamber, respectively, for clamping and relaxation. The pressure chambers can be connected together via a ring chamber to one pressure source.

  A peripheral wall opening is formed at the open end of the tightening bush between the collar of the shaft support and the end surface of the tightening bush, and this peripheral wall opening is connected to a ring chamber inside the chuck, And it can be selectively opened and closed via a seal piston arranged on the shaft support. For this purpose, the seal piston is guided to slide along the shaft support so that the seal member can move to the seal surface on the end face side of the tightening bush.

  During the operation for tightening the winding tube and winding the thread, the clamping device is operated without pressure, so that the clamping element is kept in the radially outer position under the action of the spring and around the clamping bushing. Fix the covered tube. In this state, the seal piston is kept in an open position on the shaft support, so that the ring chamber between the tightening bush and the shaft support is connected to the periphery via the peripheral wall opening, and from all pressure chambers. Air flows out.

  After the package is completed by winding in the winding tube and the clamping bush is braked for package replacement, the compressed air supply device is activated, and the sealing piston first opens the peripheral wall between the shaft support and the clamping bush. Thus, the pressure air flowing into the ring chamber between the shaft support and the clamping bush can be introduced into the pressure chamber of the clamping device. In the clamping element, an aerodynamic force acting in the direction opposite to that of the spring is generated, and the aerodynamic force causes the clamping element to move. As a result, the clamping element releases the winding tube around the clamping bush. This process is repeated each time the package is replaced.

  It was observed that the clamping bushing moved relative to the shaft support due to the load on the package when the chuck protruded very long. As a result, the gap forming the ring chamber is shifted, and as a result, the end surface portion located inside the tightening bush is held eccentrically with respect to the shaft support, particularly in the stopped state. This can cause non-uniformity when sealing the peripheral wall opening, and such non-uniformity promotes wear of the seal member or even causes non-sealability.

  It is therefore an object of the present invention to improve a chuck of the type mentioned at the outset so as to guarantee the disengagement of the wound tube by the supply of compressed air, irrespective of the length and load of the chuck bushing.

  In the configuration of the present invention that solves this problem, the seal piston has a centering addition portion on the end face directed to the end face portion of the tightening bush, and the centering addition portion is in contact with the seal piston on the seal surface. , Entered into the tightening bush.

  Further preferred embodiments of the invention are defined by the features and combinations of features of each dependent claim.

  The invention has the particular advantage that the clamping bushing is brought to a predetermined centered position around the shaft support before sealing of the peripheral wall opening. As a result, the sealing surface of the tightening bush can always be properly oriented with respect to the sealing member held by the sealing piston. In addition, the position of the chuck bushing around the shaft support is stabilized, which in particular facilitates the removal of the full package. The positive pressure inside the clamping device, which is necessary to eliminate the load on the clamping element, remains constant during the entire exchange time until reaching the new winding tube, so the clamping element moves radially inwards. Stay in the position you entered.

  In order to obtain a uniform position of the clamping bush with respect to the shaft support over the entire circumference, the sealing piston is preferably formed in a ring shape and the centering addition is formed as an annularly closed ring, Alternatively, it is formed in an annular shape with individual dividing gaps oriented in the axial direction. In this way, the tightening bush can be moved in the radial direction with respect to the shaft support over the entire circumference.

  In order to ensure the engagement of the centering addition of the sealing piston even when the relative movement of the clamping bushing is relatively large, in another aspect of the invention, the clamping bushing is positioned opposite the centering addition of the sealing piston. Thus, it has an annular inner slope that cooperates with the centering addition portion.

  In order to accommodate the seal member, the seal piston has an annular groove formed on the end surface of the centering addition portion so as to be shifted in the axial direction. As a result, the seal member has a more reliable holding portion. The deviation between the end of the centering addition and the sealing member held in the annular groove ensures pre-centering, after which the sealing member contacts the sealing surface of the clamping bushing. However, in order to obtain a sufficient sealing action, the deviation is limited to a maximum of 2 mm.

  In order to avoid any contact between the seal piston and the clamping bush during rotation of the chuck, in another aspect, a spring is provided between the shaft support and the seal piston to keep the seal piston in an open position. Works. If comprised in this way, the surrounding wall opening between a clamping bush and a shaft support body will always be maintained in the open state at the time of rotation of a clamping bush, and air will be discharged | emitted from the pressure chamber of a clamp apparatus.

  Only when the clamping bush is fully braked for replacement of the full package can the seal piston be moved to the closed position via the compressed air control device. For this purpose, the guide end of the seal piston is guided inside a ring chamber formed in the shaft support, and at this time the ring chamber can be connected to a compressed air source.

  Next, an embodiment of the chuck according to the present invention and another advantage of the present invention will be described in detail with reference to the drawings.

1 is a longitudinal sectional view schematically showing an embodiment of a chuck according to the present invention. It is the schematic which expands and shows the seal piston of embodiment shown in FIG. 1 in the open position. It is the schematic which expands and shows the seal piston of embodiment shown in FIG. 1 in the closed position.

  FIG. 1 schematically shows an embodiment of a chuck according to the invention in a longitudinal section, for example used in a winder to accommodate a plurality of winding tubes and to wind up yarns. The chuck has a drive shaft 3, and this drive shaft 3 is rotatably supported via a plurality of bearings 4 inside a hollow cylindrical shaft support 2. The drive shaft 3 is connected to an electric drive device at an end (not shown). At the end protruding from the shaft support 2, the drive shaft 3 is non-rotatably coupled to the hollow cylindrical tightening bush 1 via a hub 15. At this time, the protruding portion of the shaft support 2 has entered the open end of the tightening bush 1 to support the drive shaft 3.

  A clamping device 5 is disposed around the tightening bush 1, and the clamping device 5 includes one outer tightening sleeve 7 and a plurality of clamp elements 6 disposed between the tightening bush 1 and the tightening sleeve 7. And have. In this embodiment, each of the clamp elements 6 is formed by a clamp block 10 that can move in the radial direction and a piston 8 that can move in the axial direction, and the clamp block 10 has a wedge-shaped guide surface along the piston 8. Is guided through. At this time, the clamp block 10 enters the opening 11 of the outer fastening sleeve 7. The piston 8 has a plurality of cuts 38 distributed around it to accommodate a plurality of clamp blocks 10.

  The piston 8 guided in the axial direction for moving the clamp block 10 in the radial direction is arranged between a spring 9 and a pressure chamber 12 formed between the clamping sleeve 7 and the clamping bush 1. At this time, the piston 8 is supported by a stopper 17 that is fixedly coupled to the tightening bush 1 via a spring 9. In the state shown in FIG. 1, the clamping element 5 is shown in the clamping position, and in this clamping position, the clamping block 10 is held by the piston 8 in the advanced clamping position using a spring 9. In order to disengage the winding tube 32, the piston 8 is pressed against the spring 9 by a pressure medium, preferably compressed air, via the pressure chamber 12 on the side opposite to the spring 9, so that the piston 8 resists the spring 9. To move toward the stopper 17. This moves the wedge-shaped guide surface, so that the clamping block 10 can move radially inward. For sealing against the pressure chamber 12, the piston 8 has a plurality of sealing members on the side to be pressed, and these sealing members are respectively between the piston 8 and the tightening bush 1 and between the piston 8 and the tightening sleeve 7. A sealing action is produced between the two.

  The clamping elements 6 adjacent to the tightening bush 1 in the longitudinal direction are identically configured, and the pressed end faces of the piston 8 are then positioned opposite to each other and define a pressure chamber 12. ing. As a result, the winding tube 32 is tightened by the two adjacent clamping elements 6. In order to dissociate, both pistons 8 of adjacent clamping elements 6 are controlled simultaneously by a pressure chamber 12. For this purpose, the pressure chamber 12 is connected via a through hole 13 to a ring chamber 14 formed between the tightening bush 1 and the shaft support 2.

  In the longitudinal direction of the tightening bush 1, the clamping device 5 has a plurality of clamping elements 6, which are formed in the same manner, and in these clamping elements 6, each pressure chamber 12 is It is connected to the ring chamber 14 via the through-hole 13 or to the pressure chamber 35 in the front part of the tightening bush 1. The ring chamber 14 is connected to an air supply passage through a plurality of passages 33 around the shaft support 2, and the air supply passage may be formed by a hole 34 in the shaft support 2, for example.

  A cover 16 is fixedly held by the tightening bush 1 at the free end of the chuck. The cover 16 is dimensioned so that the pressure chamber 35 formed inside the tightening bush 1 at the end is closed by the cover 16.

  The tightening bush 1 has a free end surface portion 19 at the end located on the opposite side, and this end surface portion 19 is formed in a collar shape and forms a sealing surface 20 on the exposed side. ing. A peripheral wall opening 18 is formed between the end surface portion 19 of the tightening bush 1 and the shaft support 2 that is located facing the end surface portion 19 and has the collar 28. A ring chamber 14 is connected to the periphery. A seal piston 21 that can move to the shaft support 2 is disposed in correspondence with the peripheral wall opening 18, and the peripheral wall opening 18 is selectively maintained in an open state or a closed state by the seal piston 21.

  In order to further describe the sealing piston 21 held on the shaft support 2, reference is additionally made to FIG. FIG. 2 shows an enlarged partial view of the peripheral wall opening 18 between the tightening bush 1 and the shaft support 2. The seal piston 21 has a centering addition portion 23 on an end face directed to the end face portion 19 of the tightening bush 1, and the centering addition portion 23 projects in the axial direction toward the tightening bush 1. 21 is formed.

  The tightening bush 1 has an inner inclined surface (Innenphase) 31 located on the inner side at the end surface portion 19, and the inner inclined surface 31 cooperates with the centering adding portion 23 when the seal piston 21 moves.

  Since the seal piston 21 is formed in a ring shape, the centering addition portion 23 is a closed ring. However, basically, one or a plurality of division gaps may be provided in the circumferential direction of the centering addition portion 23.

  An annular groove 36 is provided on a free end surface of the seal piston 21 that is shifted in the radial direction with respect to the centering addition portion 23, and a ring-shaped seal member 22 is held in the annular groove 36. . The seal member 22 extends up to the height of the centering addition portion 23 in the axial direction. Preferably, a maximum displacement of 2 mm is formed between the seal member 22 and the centering addition portion 23. If comprised in this way, when the seal piston 21 moves in the axial direction, the engagement with the centering addition portion 23 can be achieved first in the tightening bush 1.

  A seal surface 20 is formed on the end surface portion 19 of the tightening bush 1 so as to face the seal member 22 in the seal piston 21, and this seal surface 20 is used to seal the peripheral wall opening 18. Work with 22

  The seal piston 21 has a guide end 24 on the side opposite to the seal member 22, and the guide end 24 is guided in the ring chamber 25 of the shaft support 2. The ring chamber 25 can be connected to a compressed air source via a passage 33. An inner seal member 39 and an outer seal member 40 are provided around the guide end portion 24, respectively, and both the seal members 39 and 40 seal the ring chamber 25 against the seal piston 21.

  A recess 37 is formed in the central region of the seal piston 21, and a spring 27 is disposed in the recess 37. The spring 27 is supported at one end via a holding body 26, and the holding body 26 is fixed to the shaft support 2. The spring 27 is supported by the seal piston 21 at the end located on the opposite side.

  1 and 2, the chuck is shown in an operating state, and in this operating state, a plurality of winding tubes are tightened around the chuck, and at this time, the chuck is in a ready state for winding the yarn. is there. In this state, the seal piston 21 is pressed into the ring chamber 25 via the spring 27, so that the peripheral wall opening 18 is opened and the ring chamber 14 is surrounded by the pressure chamber 12 in order to release the pressure chamber 12 of the clamping device 5. It is connected to the. The clamping element 6 of the clamping device 5 is kept in the tightening position by a spring force.

  At the end of the winding process, the drive shaft 3 is braked together with the clamping bush 1 so that the wound package can be removed from the chuck. At this time, compressed air is supplied from the compressed air source, and this compressed air first flows into the ring chamber 25 through the passage 33 and moves the seal piston 21 toward the end face portion 19 of the tightening bush 1. At this time, due to the engagement of the centering additional portion 23, the end face portion 19 of the tightening bush 1 properly orients the tightening bush 1, and as a result, the tightening bush 1 is centered at a predetermined position with respect to the shaft support 2. At this time, the centering additional portion 23 of the seal piston 21 and the inner inclined surface 31 of the tightening bush 1 work together. Next, the seal member 22 of the seal piston 21 is pressed against the seal surface 20 in the end surface portion 19 of the tightening bush 1. The peripheral wall opening 18 between the tightening bush 1 and the shaft support 2 is closed.

  The compressed air introduced through the shaft support 2 reaches the ring chamber 14 through the hole 34 and the passage 33. The compressed air is further guided from the ring chamber 14 to the pressure chamber 12 of the clamp device 5 through the through hole 13. As a result, the load on the clamp element 6 is reduced. At this time, the piston 8 is moved against the spring 9 and the clamp block 10 is pulled back to its inner position. The winding tube 32 held around the tightening sleeve 7 is free and can be removed from the chuck. This state is shown in FIG. The centering of the clamping bush 1 around the shaft support 2 ensures that the sealing member 22 contacts the sealing surface 20 of the clamping bush 1 facing each other evenly over the entire circumference. Such stabilization has a positive effect on the removal of the full package, especially in extremely long protruding chucks. Furthermore, since the sealing surface is oriented with respect to the sealing member, a high sealing performance is obtained, so that the clamping device does not move in the disengaged position during the entire exchange time. This avoids early and undesired advancement of the clamp block.

  To emphasize and state here, the structural configuration of the chuck is merely an example. Thus, for example, the shaft support may be formed integrally or by a member consisting of a plurality of parts. Similarly, the illustrated clamping element is merely an example. What is important at this time is that compressed air that can be supplied via the ring chamber is required for relaxation.

Claims (7)

A chuck of a winder for receiving and fixing a winding tube and winding a yarn to form a package, which is held around the protruding shaft support (2) and the shaft support (2) A clamping bush (1), and the clamping bush (1) has a clamping device (5) for fixing the winding tube (32) around the clamping bush (1), and the clamping device (5) includes a plurality of clamping devices (5). Movable clamp elements (6), each clamp element (6) being arranged between a pressure chamber (12) and a spring (9), said pressure chamber (12) being And can be connected to a compressed air source via a ring chamber (14) formed between the shaft support (2) and the clamping bush (1), and the ring chamber (14) is connected to the clamping bush (14). In the inner end face (19) of (1), the tightening bush (1) and a peripheral wall opening (18) formed between the collar (28) of the shaft support (2) and connected to the periphery, and the peripheral wall opening (18) is connected to the shaft support. (2) is closable by a sealing piston (21) formed movably along the sealing piston (21) which is clamped by a sealing member (22) to seal the peripheral wall opening (18). In the chuck acting on the sealing surface (20) of the bush (1),
The seal piston (21) has a centering addition part (23) on an end surface thereof directed to the end face part (19) of the tightening bush (1), and the centering addition part (23) The chuck, which enters into the tightening bush (1) when the seal piston (21) contacts the seal surface (20).   The seal piston (21) is formed in a ring shape, and the centering addition part (23) is formed in an annular shape with a radial division gap or without a radial division gap. Item 2. The chuck according to item 1.   The tightening bush (1) has an annular inner inclined surface (31) that cooperates with the centering addition portion (23) so as to face the centering addition portion (23) of the seal piston (21). The chuck according to claim 1 or 2, wherein:   The said sealing piston (21) has the groove | channel (36) formed in the end surface of the said centering addition part (23) shifted in the axial direction which accommodates the said sealing member (22). The chuck according to any one of 1 to 3.   The chuck according to claim 4, wherein a deviation between the end of the centering addition part (23) and the seal member (22) held in the groove (36) is 2 mm at the maximum.   A spring (27) is provided between the shaft support (2) and the seal piston (21) to keep the seal piston (21) in an open position. The chuck according to the item.   The seal piston (21) is guided inside a ring chamber (25) formed in the shaft support (2) at a guide end (24) located on the opposite side of the seal member (22). The chuck according to any one of claims 1 to 5, wherein the ring chamber (25) is connectable to the source of compressed air.

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