JP2008504463A - Centrifugal force actuated sleeve clutch - Google Patents

Abstract

  A sleeve clutch used in a spindle of a textile machine, wherein the sleeve clutch is formed in the shaft (7) of the spindle (7) in the radial direction and is fitted in a hole (6) which is undercut (1) Each of the connecting pieces (1) is slidable in the hole (6) and has a sleeve (11) attached to the spindle (7) under the action of centrifugal force with its end directed outwardly. The frictional force coupling between the rotating spindle (7) and the sleeve (11) is thereby formed. The connecting piece (1) has an annular groove (2) around it, and an independent spring element is fitted in the groove (2). The spring element can sink into the groove (2) for attachment of the connecting piece (1) and engages the undercut (10) after this attachment. This sleeve clutch can be applied to a spindle of a spinning machine or a winding machine.

Description

  The present invention relates to a sleeve clutch according to the superordinate concept of claim 1.

  Sleeve clutches are disclosed in Swiss Published Patent Application No. CH464751, in which a plurality of button-like entrainers are evenly distributed around the spindle and arranged in blind holes. Has been. The entrainment body called a connection button is hollow and formed in a hat shape (hat shape). These connection buttons are made of a spring elastic material and can be inserted into the blind hole. When the connection button is fitted, the edge of the connection button is fitted in the undercut portion formed in the blind hole. A coil compression spring is inserted into the blind hole with each connection button. This coil compression spring always presses the connecting button outward. The sleeve can be held by this spring force. This spring force must be overcome during the insertion and removal of the sleeve and is a relatively large force. Since the connecting button has a thin wall, the mass of the connecting button is small. For this reason, the force that presses the connecting button toward the inner surface of the sleeve is generated only by the spring even when the spindle rotates. The spring force must be at least large enough to ensure that the sleeve is entrained. Such a large spring force prevents the sleeve from being replaced, i.e. the empty sleeve to be fitted is only brought to the operating position by its own weight, so that the connecting button resists the spring force, It must be pushed into the blind hole perpendicular to the direction of movement of the sleeve. In the case of doffing in a spinning machine, a strong frictional force must be overcome both in the case of removal and insertion. Friction between the inner surface of the sleeve and the connecting button causes wear, which wears the inner surface of the sleeve. This roughening increases the coefficient of friction between the sleeve and the connecting button, so that the sleeve pressing force further increases with long-time operation. Sealing inside the blind hole against dirt is inadequate, because thin walled connection buttons often cause non-uniform plastic deformation during installation, leaving a gap between the blind hole surface and the connection button. This is because such a gap is generated anyway when the sleeve is fitted.

  EP-A-0 517 341 discloses elements for centering and fixing of a sleeve to the spindle of a ring spinning machine. This sleeve is fixed not by the connecting button but by an elastic member formed in a polygon instead. This member is elastically deformed when the sleeve is fitted into the spindle, and pushes the inner surface of the sleeve at the smoothly chamfered corner. The force for fixing and entraining the sleeve is generated solely by the spring force. It is well known that this relatively large force prevents sleeve replacement. It is necessary to overcome a large frictional force for doffing in this spinning machine. The force for fixing and entraining the sleeve must be applied to the inner wall of the sleeve exclusively using the three corners of the elastic member, so that the contact between the member and the sleeve is exerted by the force. The surface is very small and the risk of roughening is even greater than in the case of the sleeve clutch of the aforementioned Swiss patent application CH 464751.

  An alternative solution is likewise disclosed in the Swiss patent application CH 464751, which shows a solid connection button. During the rotation of the spindle, the connecting button is moved radially outward by centrifugal force and pressed onto the inner wall of the sleeve. Each solid connection button is inserted into a hollow chamber extending in the axial direction of the spindle, and a cylindrical portion thereof is inserted into the hole from the inside to the outside. The connection button is movably held in the hole. For this purpose, the connecting button has a supporting shoulder. The diameter of the support shoulder is larger than the diameter of the cylindrical part of the connection button. The formation of a spindle as a partial hollow spindle is a laborious operation. In addition, protection from dirt inside the spindle is required, for example a specially formed sealing lid with cylindrical projections. Inserting the connecting button requires skill and skill, and is a laborious operation. Not only does it take time to assemble, but the manufacturing costs of the spindle are particularly high.

  German Offenlegungsschrift DE 4430709 discloses a sleeve clutch for a spindle. The sleeve clutch is provided with a through hole extending in the radial direction. In each through hole, two cylindrical bodies, each shown as a centrifugal force body, are pressed. This centrifugal force body has a convexly curved connecting surface on its front surface protruding from a radially extending through-hole, on which a conical component surface called a shoulder comes into contact. In order to prevent the sleeve from being unable to be attached to the spindle rotating part, this shoulder part protrudes from the spindle rotating part during the operation of the spindle, that is, during its rotation around the rotation axis. To prevent. For this purpose, each shoulder portion is provided with a corresponding facing surface on the periphery of the spindle rotating portion. The facing surface is formed by plastically deforming the hole where it moves to the outer peripheral edge of the spindle rotating portion. In addition, in order to deform or caulk the spindle rotating portion during insertion of the entrainment body, it is necessary to use a tool having an embossing die. After such plastic deformation, the centrifugal force body cannot be removed from the hole without breaking. The centrifugal force body is completely submerged in the hole when the spindle is stationary, and dirt, for example, dust or fiber pieces can enter between the opposing surface and the centrifugal force body. When the spindle is rotating, the dirt is pressed against the opposing surface, making it very difficult to remove. For this reason, functional failure or functional loss of the sleeve clutch may occur.

  Similarly, German patent application DE 43 23 068 discloses a sleeve clutch. The entrainment body formed as a thin cap of the sleeve clutch wall is likewise urged by a coil compression spring. An additional mass is inserted into the elastically deformable cap. The spring force of the coil compression spring and the resistance force of the spring when the sleeve is removed in the stationary state of the spindle are made smaller, for example, disclosed in the above-mentioned Swiss patent application publication CH 464751. Only 30 to 70 percent of the value normally required for an entrained body loaded exclusively by a coil compression spring. When the spindle is stationary, only the spring force as the pressing force of the cap acts on the sleeve when doffing. As the rotational speed increases, this pressing force increases in response to the centrifugal force acting on the additional mass. Despite the relatively small spring force between the spindle and the sleeve, no slip occurs due to the additional centrifugal force. The sealing action of this thin elastic cap is insufficient in this conventional example. Its manufacturing and assembly costs are relatively high. The edge of the cylindrically formed partial body that forms the additional mass may cause strong wear or even damage over time due to local pressure loading on the thin cap. Become.

  The object of the present invention is to improve the formation of a sleeve clutch on a spindle, starting from the above-mentioned prior art.

  The above-mentioned problems of the present invention are solved by a sleeve clutch having the characteristic part of claim 1.

  Advantageous embodiments of the invention are described in the dependent claims.

  A sleeve clutch formed in accordance with the present invention includes a connecting piece that can be easily, quickly and accurately sized and mounted in a hole. No time-consuming plastic deformation of the spindle, which requires a pressing tool means during the attachment of the connecting piece, is necessary. Moreover, it is not necessary to form a spindle as a laborious partial hollow spindle and to provide a sealing cap for covering the hollow chamber of this hollow spindle. The connecting piece according to the present invention is strong and has little wear. The internal space of the hole is effectively protected from dirt. If dirt accumulates on the outer edge of the hole, this dirt is again wiped off the connecting piece. The connecting piece is formed in such a way that the centrifugal force caused by its mass alone is sufficient to securely hold and entrain the sleeve during the rotation of the spindle. The spring element ensures that the entrainment piece does not detach from the hole. Also, a limited play in the radial direction of the connecting piece relative to the hole or relative to the spindle is defined and maintained by the spring element. The entrainment piece is easily fitted.

  The diameter of the connecting piece formed in a cylindrical shape is slightly smaller than the diameter of the hole. This connecting piece has an annular groove on its end that is directed inward when assembled, and an independent spring element is fitted in this groove. This spring element consists in particular of a spring wire and is preferably formed as an oval ring. In particular, the ring is open on one side. Such a ring is inexpensive and easy to manufacture. The assembly of the spring element is easy and takes place in a short time. The width and depth of the groove is larger than the diameter of the spring wire, so that the spring element is completely receivable by the groove. Upon fitting of the connecting piece into the spindle bore, the spring element is radially compressed so that it can be submerged in the groove of the connecting piece. This compression of the spring element is facilitated by the shape of the spring element made as an oval and an open ring, or the circular cross-section of the spring wire, when inserted into the hole in the connecting piece. When the connecting piece is inserted deeply into the hole until the groove reaches the undercut of the hole, the radial force no longer acts on the spring element. As a result, the spring element spreads apart again and functions as a reliable holding means for preventing the coupling piece from being detached from the hole.

  When the connecting piece and the spring element form a pre-assembled group of components, only a small working time is required for pre-assembling the connecting piece and the spring element as well as for insertion into the spindle bore. Not only the connecting pieces, but also the spring elements that cooperate with the connecting pieces can be manufactured easily and with little effort and cost. The pre-configured configuration groups, each consisting of a connecting piece and a spring element, are inserted into the spindle holes provided for insertion of the configuration groups after assembly. The effort and cost required for complete assembly is reduced. The connecting piece and the spring element can be assembled easily and with little effort and cost.

  Advantageously, the solid connecting piece made of hardened steel is hard to wear and has a relatively large mass. Based on this mass, the connecting piece abuts the sleeve inner wall particularly well with the necessary force for fixing the sleeve during rotation of the spindle.

  The spindle formed according to claim 7 can achieve stable three-point holding and centering with a minimum number of three connecting pieces in a single plane.

  A pre-assembled group of constructions, each consisting of a connecting piece and a spring element, is suitable for later attachment to a spindle already having a suitable undercut and can replace a conventional entrainment.

  The sleeve on which the sleeve clutch according to the present invention is mounted can be easily fitted and removed. The connecting piece thereby engages the inner surface of the sleeve without spring force.

  The sleeve clutch according to the present invention can be operated safely and without dirt, and is not easily worn. According to the present invention, manufacturing is low cost, and assembly is short and easy.

  The present invention will be described below with reference to the drawings.

In the drawing
FIG. 1 is a side view showing a pre-assembled configuration group composed of connecting pieces and spring elements;
FIG. 2 is a plan view showing the configuration group of FIG.
FIG. 3 is a perspective view showing the configuration group of FIG.
FIG. 4 is a partial cross-sectional view of a spindle having a sleeve clutch when the connecting piece is assembled;
FIG. 5 is a partial cross-sectional view of a spindle having a sleeve clutch after coupling pieces are assembled;
FIG. 6 is a cross-sectional view of a spindle having three connecting pieces in the operating position.

  The preassembled construction group shown in FIG. 1 consists of a connecting piece 1 and a spring element. The connecting piece 1 has a groove 2 in which a spring element formed as an open ring 3 is fitted. At the end opposite to the groove 2, the connecting piece 1 has a connecting surface 4 curved in a convex shape.

  In the plan view of the connecting piece 1 in FIG. 2, the oval shape of the ring 3 can be recognized. The ring 3 is open between the free ends 5 and the free ends 5 are clearly spaced from one another. The free end 5 of the ring 3 fits in the groove 2 as can be seen from the description of FIG. 2 and the perspective view of FIG. The part of the ring 3 that faces the open part completely penetrates into the groove 2. Such a shape of the ring 3 cooperates with the groove 2 to securely hold the ring 3 on the connecting piece 1.

  FIG. 4 shows the connecting piece 1 while being fitted into the hole 6 of the spindle 7. For this purpose, a preassembled construction group consisting of the connecting piece 1 and a ring 3 having an end engaged in the groove 2 is inserted into the hole 6. This insertion is facilitated by the chamfer 12 on the periphery of the hole 6. Due to the force in the direction of arrow 8 applied to the connecting surface 4, the connecting piece 1 is pushed into the hole 6 and reaches, for example, the bottom 9 of the hole 6. When the ring 3 is fitted, the ring 3 is loaded by a force directed in the radial direction with respect to the side surface of the hole 6 by being pushed in, and is completely submerged in the groove 2. When the ring 3 reaches the undercut part 10, no radial force is applied to the ring 3 any more, and the ring 3 expands again in the undercut part 10, as shown in FIG. As a result, the ring 3 again becomes an oval as shown in FIGS. As a result, the connecting piece 1 is held movably in the spindle 7.

  FIG. 6 shows a sleeve clutch. The sleeve clutch is formed as a three-point centrifugal clutch in the illustrated embodiment. When the sleeve 11 is fitted into the spindle 7, the connecting piece 1 substantially protruding from the hole 6 is pushed into the hole 6 of the spindle 7. At this time, there is no spring force to overcome. The connecting piece 1 is in an operating position that is located when the spindle 7 rotates at the operating speed. During the rotation, the connecting piece 1 is pressed toward the inner wall of the sleeve 11 in the outer direction under the action of centrifugal force on each connecting surface 4. Thereby, the sleeve 11 is effectively centered with respect to the spindle 7 during operation and is securely fixed in its position. In order to remove the sleeve 11, the spindle 7 is stopped. At this time, the centrifugal force no longer acts on the connecting piece 1 and no radial force acts on the inner surface of the sleeve. At this time, the sleeve 11 can be easily detached from the spindle 7 again.

  The force generated by the dead weight of the connecting piece 1 and acting outward in the radial direction releases the reliable holding of the connecting piece 1 and causes the connecting piece 1 to come out of the hole 6 of the spindle 7. It does not make it possible. This also applies to the centrifugal force, which acts on the connecting piece 1 when the spindle 7 rotates at the operating speed and the sleeve 11 is not fitted over the spindle 7. The expanded ring 3 engages with the undercut portion 10 to always ensure a reliable holding in the spindle 7 and prevent unintentional detachment from the hole 6 of the connecting piece 1.

FIG. 5 is a side view showing a pre-assembled configuration group composed of connecting pieces and spring elements. It is a top view which shows the structure group of FIG. It is a perspective view which shows the structure group of FIG. It is a fragmentary sectional view of the spindle which has a sleeve clutch at the time of a connection piece incorporation. It is a fragmentary sectional view of a spindle which has a sleeve clutch after connecting piece incorporation. It is a cross-sectional view of a spindle having three connecting pieces in the operating position.

Claims (7)

A sleeve clutch used in a spindle of a textile machine, the sleeve clutch having a connecting piece fitted in a hole formed in an axis of the spindle and undercut in a radial direction. Are slidable in the bores of the spindle and are pressed toward the inner surface of a sleeve attached to the spindle under the action of centrifugal force with the end directed outwardly. In a type in which a frictional coupling between the rotating spindle and the sleeve is formed,
The connecting piece (1) has an annular groove (2), and an independent spring element is fitted in the groove (2). The spring element (2) is connected to each connecting piece (1). A sleeve clutch, characterized in that it can sink into the groove 2 for mounting and engages the undercut (10) after said mounting.   The sleeve clutch of claim 1, wherein the spring element comprises a spring wire.   The sleeve clutch according to claim 1 or 2, wherein the spring element is an oval ring (3).   4. The sleeve clutch as claimed in claim 1, wherein the spring element is an open ring (3).   The sleeve clutch according to any one of claims 1 to 4, wherein the connecting piece (1) and the spring element constitute one constituent group that can be assembled in advance.   6. A sleeve clutch as claimed in claim 1, wherein the connecting piece (1) is made of hardened steel.   The spindle (7) has at least three holes (6) for receiving the connecting piece (1), the holes being evenly distributed in a plane intersecting the spindle axis and around the spindle (7). The sleeve clutch according to claim 1, wherein the sleeve clutch is arranged.

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