EP2807101B1 - Device for clamping and releasing a winding tube - Google Patents

Description

The invention relates to a device for tensioning and releasing a winding tube, with a rotatable by means of a spindle motor holder for the winding tube and with a clamping means for clamping the winding tube during its rotation, wherein the clamping means is connected via a power transmission means with a spring means and the clamping means due to the force acting on this via the force transmission means spring force the winding tube clamped to rotation.

A device of this kind is from the US 4,767,077 become known, in which a sleeve for receiving a web by means of a number of split, the Spuldorn surrounding rings can be held, when these rings are provided by provided on the circumference of the mandrel, with slanted ramp surfaces cooperating rollers. Furthermore, a pressing unit for generating an axial force is provided, which can press the rings together in the axial direction. The structure shown is very complex and has a large number of items, with a hydraulic power generation is also provided.

It is an object of the invention to provide a device by means of which coils or bobbin tubes can be reliably clamped onto a spinneret without additional actuators or manually operable levers and can also be released quickly and automatically.

This object is achieved with a device of the type mentioned, in which according to the invention designed in the winding direction as a freewheel release device is provided, which remains when turning the holder in the winding direction in an inactive position and which is adapted to rotate the holder against the winding direction to move the power transmission means against the spring force to cancel the clamping of the winding tube.

Thanks to the invention, a freewheel is created, which makes it possible that the holder for the winding tube can be driven freely in the winding direction, however, in a rotation in the opposite direction blocking and thus releasing the winding tube takes place. The turning against the winding direction is conveniently done by means of the spindle motor, but it can also be done by hand, with only a short turn necessary to allow the release.

In an expedient variant, it is provided that the force transmission means is designed as a tubular sleeve, which sits on a driven by the spindle motor spool, with this connected to rotation and with respect to the same is longitudinally displaceable.

The release of the winding tube is particularly simple if the direction of rotation of the spindle motor is reversible, the spindle motor to release the winding tube whose holder rotates against the winding direction.

In expedient variants, the tube sleeve is loaded with spring force with respect to the spool in the direction of its receiving end by means of the spring means.

For safe and secure with little effort can be provided that in an annular gap, which is formed by the free end of the tube sleeve and an all-round, with respect to the spool fixed clamping surface as clamping means an elastically deformable clamping ring is arranged, which upon compression by the Spring force evades radially outward and presses against the inner surface of the winding tube. It makes sense if the free end of the tube sleeve and the fixed clamping surface with respect to the chuck are chamfered.

Another expedient embodiment provides for the clamping of the winding tube, that the winding tube is clamped with its two ends between two circular rotatable cones, a first cone stationary, the second cone, however, is displaceable in the axial direction, and at the free end of a hollow shaft provided as a force transmission means sits, which is driven and rotatable and limited slidable in the axial direction.

In a practice-proven robust development of the invention, it is provided that the release device has a turntable connected to the power transmission means, the turntable, leaving a disc-shaped gap opposite a stationary, plate-shaped abutment is arranged in the turntable, the abutment facing with respect to the axis of rotation substantially arcuate Recesses for receiving a ball are formed, wherein the bottom of each recess in a direction of rotation is so far rising, that upon rotation of the spool and the turntable against the winding direction balls supported supported on the abutment and push the turntable against the spring force of the abutment, whereby the winding tube is released. In this case, it is advantageous if the turntable is arranged at the end remote from the coil receiving side end of the tube sleeve and it can also be provided that the turntable is arranged at the end remote from the coil receiving side end of the shaft. Furthermore, the recesses can expediently extend radially outward in the direction of their deepest end region.

In a mechanically expedient embodiment, it is provided that the spring means is a helical spring, which is arranged between a flange of the spool and the turntable, comprising the spool.

In order to avoid, inter alia, the penetration of foreign bodies, it is advantageous if the turntable has a circumferential, the disc-shaped gap on its circumference covering collar.

In a variant with another embodiment of the freewheel is provided that the release means connected to the power transmission means, displaceable in the longitudinal direction of the winding axis and connected to the spool on rotation rotary ring with a toothing, at least one stationary but pivotally mounted pawl lift is provided, the a with respect to its pivot axis eccentrically extending teeth, which is associated with the teeth of the rotary ring, and upon rotation of the rotary ring in the winding direction, the teeth can slide together, is taken on rotation of the rotary ring against the winding direction of the latch lever by cooperation of the teeth of the rotary ring and him pushes away against the force of the spring, whereby the winding tube is released.

Yet another variant with another embodiment of the freewheel provides that the release device has a turntable connected to the power transmission means, the turntable is leaving a gap opposite a stationary abutment is arranged on the turntable pivotable pawls are arranged, which can be supported on projections of the turntable are and can cooperate with stages of the abutment so that upon rotation of the spool and the turntable against the winding direction, the pawls are supported on the projections and on the steps and push away the turntable against the spring force of the abutment, whereby the winding tube is released However, when turning the turntable in the winding direction, the pawls can slide freely over the stages, the corresponding approximation of the turntable (35) leads to the abutment for holding the winding tube.

A field-proven variant is characterized in that the tubular sleeve is connected to the spool on a formed in the tubular sleeve longitudinal slot and engaging in this, sitting on the spool pin on rotation.

• Fig. 1 in einer schematischen Schnittansicht eine erfindungsgemäße Vorrichtung, teilweise dargestellt, mit ihrem Spannmittel in Klemmposition,
• Fig. 2 in einer Ansicht wie Fig. 1 erfindungsgemäße Vorrichtung mit ihrem Spannmittel in Freigabeposition,
• Fig. 3 einen Drehteller der Löseeinrichtung der erfindungsgemäßen Vorrichtung in schematischer und perspektivischer Darstellung,
• Fig. 3a eine schematische Abwicklung einer der in Fig. 3 gezeigten Ausnehmungen,
• Fig. 4 in einer Ansicht entsprechend Fig. 1 eine Variante, bei welcher als Halterung für die Spulhülse zwei Konen vorgesehen sind,
• Fig. 5 in einer perspektivischen Teilansicht eine andere Ausführungsform der Erfindung in einer Freigabestellung für eine Spulhülse,
• Fig. 6 die Ausführung nach Fig. 5 in einer Klemmstellung für eine Spulhülse und
• Fig. 7 und 8 ein Detail eines Freilaufs einer weiteren Ausführung der Erfindung in abgewickelter Darstellung in zwei Arbeitsstellungen.

The invention together with further advantages is explained in more detail below with reference to an exemplary embodiment, which is illustrated in the drawing. In this show

• Fig. 1 in a schematic sectional view of an inventive device, partially shown, with its clamping means in clamping position,
• Fig. 2 in a view like Fig. 1 Device according to the invention with its clamping device in the release position,
• Fig. 3 a turntable of the release device of the device according to the invention in a schematic and perspective view,
• Fig. 3a a schematic development of one of in Fig. 3 shown recesses,
• Fig. 4 in a view accordingly Fig. 1 a variant in which two cones are provided as a holder for the winding tube,
• Fig. 5 in a perspective partial view of another embodiment of the invention in a release position for a winding tube,
• Fig. 6 the execution after Fig. 5 in a clamping position for a winding tube and
• FIGS. 7 and 8 a detail of a freewheel of a further embodiment of the invention in unwound representation in two working positions.

According to the Fig. 1 and 2 a device 1 according to the invention has a spool 2 for receiving a winding tube 3, on which, for example, plastic threads can be wound. The winding tube 3 and the spool 2 are shown only partially here. The spool 2 is connected to a spindle motor 33, which is mounted on a stationary frame 34.

In order to tension the winding tube 3 on the spool 2, a clamping means is provided, which in the present case has an elastically deformable clamping ring 4, which preferably consists of a rubber-elastic material or may be formed as a circumferential spiral spring.

For the purposes of the invention, the clamping means is loaded by a force transmission means with the force of a spring means to tension the winding tube 3 on the spool 2. In the embodiment shown, the spring means is a coil spring 5, which is arranged between a flange 6 of the spool 2 and one end of a tube sleeve 7, which serves as a force transmission means.

The tubular sleeve 7 is connected to the spool 2 via a formed in the tubular sleeve longitudinal slot 8 and engaging in this, sitting on the spool pin 9 on rotation, in the axial direction of the mandrel axis a, however, limited longitudinally displaceable.

The clamping ring 4 is located in an annular gap 10, on the one hand - in the drawing on the left - from the free end 11 of the tubular sleeve 7 and on the other hand formed by a round running, with respect to the spool 2 clamping surface 12. The clamping surface 12 may be formed directly on the spool 2 or on a fixedly connected to the latter sleeve.

It is obvious that now a displacement of the displaceable tubular sleeve 7 in the direction of the receiving end of the mandrel 2 to a constriction and a displacement in the opposite Direction, left in the drawing, leads to a broadening of the annular gap 10. In a narrowing of the clamping ring 4 is squeezed and he deviates radially outwards, which leads to a proper clamping of the relevant dimensions to a clamping of the winding tube 3 with proper design. This, the normal operating case when winding corresponding state is achieved by a spring means, namely in the present case by the coil spring 5, which urges the tube sleeve 7 in the direction of the receiving end and thereby squeezes the clamping ring 4.

The invention is not limited to the use of a single clamping ring, but also several such clamping rings can be provided for a winding tube 3. In Fig. 1 and Fig. 2 is a further clamping ring 4 'located, wherein between the clamping ring 4 and this clamping ring 4' on the spool a longitudinally displaceable sleeve piece 7 'is arranged. A displacement of the tube sleeve 7 then presses not only the clamping ring 4 but, on the sleeve piece 7 'and the clamping ring 4' together.

In order to enable a release of the winding tube, the invention provides a release device is provided, which is adapted to move upon rotation of the spool 2 against the winding direction of the force transmission means, namely the tube sleeve 7 against the force of the spring to the clamping of the winding tube. 3 repealed.

In the embodiment shown, the release device on a turntable 13 which is disposed on the side facing away from the Spulenaufnahmeseite end of the tube sleeve 7, wherein the turntable 13, leaving a disc-shaped gap 14 opposite a stationary, plate-shaped abutment 15 is arranged, the stationary and for example connected to the frame 34. The turntable 13 has a circumferential, the disc-shaped gap 14 at its periphery covering collar 16, which as such is not essential to the invention.

As in detail Fig. 3 and Fig. 3a can be seen, in the turntable 13, facing a flat surface of the abutment 15, with respect to the axis of rotation a substantially circular arc-shaped recesses 17, in the present case four, each for receiving a ball 18, wherein it can be seen that the bottom 117 of each recess 17 is rising in one direction of rotation and the recesses 17 have in their lowest end portion a radially outwardly extending portion 217 ..

At the other end, each recess has a flat flattening 317 which is flat with respect to the oblique bottom region rising to this end. Furthermore, in the region of the flattening 317 of each recess 17, a small magnet 417 can be provided which is just strong enough to produce a ball 18 if it is made of a magnetizable material, such as Steel, holds, in the area of this recess holds. Such magnets 417 may be cast or glued, for example, in the turntable 13.

The described design of the release device has the consequence that upon rotation of the spool 2, the tube sleeve 7 and the turntable 13 in one direction, which is selected against the winding direction, the balls 18 are supported during rolling on the abutment and the turntable 13th push away from the abutment 15 against the force of the spring 5. As a result, but also sitting on the turntable 13 tube sleeve 7 is pushed away from the receiving end of Spuldoms 2, in the drawing to the left, and the clamping ring 4 receiving annular gap 10 increases, so that the clamping ring 4 is no longer squeezed and radially contracts inside. This leads to the release of the winding tube 3. which ensures the relaxation of the sleeve in one direction of rotation and a frictional connection in the other direction of rotation.

Upon rotation of the turntable 13 in the other direction, namely the winding direction, however, the balls 18, due to the centrifugal force migrate to the outside and finally reach the lowest point of the recesses 17, as in Fig. 3 represented and in Fig. 3a marked on the left in dashed lines. In this way, a permanent friction and associated with wear and noise in the winding direction is prevented and one arrives at a kind of "freewheel".

After switching off the motor 33, the spool 2 is rotated by means of the motor, possibly also by hand, briefly in the opposite direction, whereby the balls 18 get back to the other end of the recesses 17. The flattening 317 makes it possible for the balls 18 to remain in place even without the action of a torque of the spindle motor 33, which is expediently designed as a torque-controlled electric motor, so that the spring 5 remains compressed and the winding tube 3 removed or after Wrapping can be exchanged for a blank.

Let it still be considered the case that no winding tube sits on the spool 2. How out Fig.1 it can be seen, the disc-shaped gap is already relatively low with attached winding tube 3. However, if the winding tube is removed, then the spring 5 can move the turntable a little further in the direction of the free end of the spool 2, the clamping ring 4 still moves slightly outwards and the turntable is pressed against the abutment 15 and the spool 2 can become no longer move freely. This state can easily be detected by evaluating, for example, the motor current or signals of a rotary encoder, so that winding of the spool 2 without a mounted winding tube 3 can be avoided.

Now up Fig. 4 Referring to which like reference numerals are used for like or comparable parts of the preceding figures, it will be seen that in this variant no spool for receiving the winding tube 3 is provided, but a driven shaft 19 via a pin-slot connection 9, 8 a provided as a power transmission means hollow shaft 20 carries along rotation, which is thus driven and rotatable and limited in the axial direction displaceable. The winding tube 3 is clamped in this embodiment with its two ends between two circular rotatable cones 21, 22, wherein a first cone 21 is mounted in the drawing in a manner not shown fixed and rotatable ( Fig. 4 , right). The second cone 22 is seated at the free end of the hollow shaft 20 and is therefore rotatably driven and displaceable in the direction of the axis a.

In the in Fig. 4 shown position, the spring 5 presses the hollow shaft 20 and thus the cone 22 against the one, left in the drawing end of the winding tube 3 and thus this with its other, right in the drawing end against the fixed, but rotatable cone 21. The release of Winding tube 3 takes place analogously to the above in connection with Fig. 2 described process, wherein the hollow shaft 20 together with its cone 22 by the release device 13, 18, 15 is moved - in the drawing to the left - and the winding tube 3 is thereby released.

The release device is to move the power transmission means against the spring force upon rotation of the holder against the winding direction in order to cancel the clamping of the winding tube. The above example of a freewheel with balls on inclined treads is just one of many options available to those skilled in the art. It is essential that by briefly turning the spindle by the drive motor or by hand against the Winding direction, the coil is released or is clamped by a short turn in the winding direction. Thus, embodiments may be used in which also only a circular arc-like recess, similar to the recess 17 of the Fig. 3 and only one ball is used. Likewise, other freewheel constructions are possible in which the compression or release of a spring depending on the direction of rotation, for example by means of an eccentrically mounted lever which engages in a toothing on a turntable, or by means of a pin on a turntable, with an oblique Bump surface cooperates, is effected. Also pawls, which are provided either on a fixed plate or on a turntable, with a toothing on a turntable or on a fixed plate to ensure the desired freewheeling properties. A freewheel without teeth, as it is used for example in bicycles, is also applicable.

In the FIGS. 5 and 6 For example, an embodiment is shown which uses at least one eccentrically mounted pawl lever, which cooperates with a toothed ring. Since the construction is in large part of those after Fig. 1 and 2 or 3 is similar, the same reference numerals are used for the same or similar parts for the sake of simplicity.

In this embodiment, instead of the loaded with the spring 5 turntable 13 of the Fig. 1 and 2 a rotary ring 23 is provided, which has a circumferential toothing 23z. The rotary ring 23 is connected to the tube sleeve 7 and together with this displaceable in the axial direction. With the rotary ring 23 a pawl lever 24 cooperates, which is pivotally mounted, for example by means of a pin 25, to a stationary carrier 26 and has a toothing 24z. The toothing 24z of the pawl lever 24 is arranged eccentrically with respect to the pin 25 or its pivot axis and the pivoting movement of the pawl lever 24 is limited by two stops 24a, 24b, which cooperate with a stop pin 26a of the carrier 26. The eccentric mounting of the lever 24 also ensures that it can come into contact with the teeth 23z of the rotary ring solely by gravity. However, the latch lever could also be spring-loaded and it can be several such latch lever are used.

In the Fig. 5 shown working position corresponds to that after Fig. 2 , ie, the spring 5 is compressed, since upon rotation of the spool 2 in a first direction (indicated by an arrow) of the pawl lever 24 by cooperation of the teeth 23z, 24z is taken and presses the rotary ring 23 against the force of the spring 5 until its stop 24 b abuts against the stop pin 26 a of the carrier 26. With the rotary ring 23, the tube sleeve 7 shifts, the clamping ring 4 is applied to the spool 2 and it can be a winding tube (not shown here) are pushed (see. Fig. 2 ).

Turns the Spuldorn 2, however, in the other direction according to Fig. 6 , so he can walk freely because the latch lever 24 is rotated so that the two teeth 23z, 24z can slide together, now the other stop 24a of the pawl lever 24 abuts against the stop pin 26a and ensures a defined position of the lever 24. The spring 5 can now move the tube sleeve 7, so that the clamping ring 4 is pressed apart and a winding tube, not shown here according to the situation of Fig. 1 can fix. It is understood that two or more with the teeth of the rotary ring cooperating pawls may be provided.

Another possibility of a freewheel in one direction of rotation is in the FIGS. 7 and 8 outlined. On a turntable 35, of which only a section is shown in development, pivotable pawls 36 are provided and the turntable 35 opposite is a fixed, annular abutment 37. The turntable 35 is analogous to the turntable 13 of Fig. 1, 2 and 4 connected with a suitable clamping means via a power transmission means, with corresponding possibilities have already been shown above.

Upon rotation of the turntable 35 in a first, indicated by an arrow direction, the pawls 36 are supported on the one hand on projections 35a of the turntable 35 and with their free ends on the other hand on steps 37a of the fixed abutment 37. In this position, the turntable 35 is held at a distance from the ring 37, wherein via a force transmission means, for example, the tube sleeve 7 of Fig. 1, 2 and 4 , causes a winding tube is released. On the other hand, turning the turntable 35 in the other direction causes the pawls 36 to slide freely over the steps 37a, with the corresponding approach of the turntable 35 to the abutment 37 for holding the winding tube. The pawls 36 may be spring loaded to ensure co-operation with the steps 37a under all circumstances. It is also possible, the pawls firmly, ie not pivotally mounted to anchor on the turntable, but they form as resilient pawls, so that in this way a cooperation with the steps 37 a is secured.

It should be understood that many variations are available to those skilled in the art within the scope of the claims. Thus, the spring means may also be designed as magnetic springs or pneumatic springs.

Claims (15)

1. A device for clamping and releasing a winding tube (3), comprising a mounting (2; 22, 21) for the winding tube (3), which mounting is rotatable by means of a spindle motor (33), and comprising clamping means (4) for fixedly clamping the winding tube as said winding tube rotates, wherein the clamping means are connected to spring means (5) by means of force-transfer means (7), and the clamping means (4) clamp the winding tube so as to prevent the rotation thereof due to the spring force acting on said clamping means via the force-transfer means,
   characterized in that
   a release device (13, 18, 15; 23, 24; 35, 36, 37), which is designed as a freewheel mechanism in the winding direction and remains in an inactive position upon rotation of the mounting in the winding direction, is provided and is configured to move the force-transfer means against the spring force upon rotation of the mounting (2; 20, 22, 21), opposite the winding direction, in order to release the clamping of the winding tube.
2. The device according to claim 1, characterized in that the force-transfer means is designed as a tubular sleeve (7), which is mounted on a winding mandrel (2) driven by the spindle motor (33), is connected to said winding mandrel for rotation, and is longitudinally displaceable with respect to said winding mandrel.
3. The device according to claim 1 or 2, characterized in that the direction of rotation of the spindle motor (33) is reversible, wherein the spindle motor rotates the mounting (2; 20, 22, 21) thereof opposite the winding direction in order to release the winding tube (3).
4. The device according to claim 2 or 3, characterized in that the tubular sleeve (7) is loaded with spring force by means of the spring means (5) with respect to the winding mandrel (2), in the direction of the receiving end of said winding mandrel.
5. The device according to any one of claims 2 to 4, characterized in that an elastically deformable clamping ring (4), as clamping means, is disposed in an annular gap (10), which is formed by the free end (11) of the tubular sleeve and a clamping surface (12), which extends all the way around and is fixed relative to the clamping ring (4), which clamping ring deflects radially outwardly when compressed by means of the spring force and presses against the inner surface of the winding tube (3), wherein the free end (11) of the tubular sleeve (7) and the clamping surface (12), which is fixed relative to the winding mandrel, are preferably slanted.
6. The device according to claim 2, characterized in that the winding tube (3) can be fixedly clamped via the two ends thereof between two circular rotatable cones (21, 22), wherein a first cone (21) is fixed, but the second cone (22) is displaceable in the axial direction and is mounted at the free end of a hollow shaft (20), which is provided as force-transfer means and is driven and rotatable and is displaceable, in a limited manner, in the axial direction.
7. The device according to any one of claims 1 to 6, characterized in that the release device comprises a rotary plate (13), which is connected to the force-transfer means, and a stationary, plate-shaped support bearing (15), which is disposed opposite the rotary plate so as to leave a disk-shaped gap (14), recesses (17) for receiving one ball (18) in each case are formed in the rotary plate, facing the support bearing, which recesses are shaped substantially as a circular arc relative to the axis of rotation (a), wherein the base of each recess (17) rises in one direction of rotation to the extent that, upon rotation of the winding mandrel (2) and the rotary plate opposite the winding direction, balls roll so as to be supported against the support bearing and press the rotary plate away from the support bearing, against the spring force, whereby the winding tube (3) is released.
8. The device according to claim 7 and any one of claims 2 to 5, characterized in that the rotary plate (13) is disposed at the end of the tubular sleeve (7) facing away from the winding receiving side.
9. The device according to claim 7 and claim 8, characterized in that the rotary plate (13) is disposed at the end of the shaft (20) facing away from the winding receiving side.
10. The device according to claim 7, characterized in that the recesses (17) extend radially outwardly in the direction of the lowest end region thereof.
11. The device according to claim 2, characterized in that the spring means is a coil spring (5), which is disposed between a flange (6) of the winding mandrel (2) and the rotary plate (13), which flange encircles the winding mandrel (2).
12. The device according to claim 7, characterized in that the rotary plate (13) has a peripheral collar (16), which covers the disk-shaped gap (14) on the periphery thereof.
13. The device according to any one of claims 1 to 6, characterized in that the release device comprises a rotary ring (23), which has teeth (23z), is connected to the force-transfer means, is displaceable in the longitudinal direction of the winding axis, and is connected to the winding mandrel (2) for rotation, at least one ratchet lever (24) is provided, which is mounted so as to be stationary but pivotable and which has teeth (24z) extending eccentrically relative to the pivot axis thereof, which teeth are associated with the teeth (23z) of the rotary ring, and when the rotary ring rotates in the winding direction, the teeth can glide on one another, and when the rotary ring rotates opposite the winding direction, the ratchet lever is entrained by the rotary ring by means of the interaction of the teeth (23z, 24z) and presses the rotary ring away from itself via the force of the spring (5), whereby the winding tube (3) is released.
14. The device according to any one of claims 1 to 6, characterized in that the release device comprises a rotary plate (35) connected to the force-transfer means, a stationary support bearing (37) is disposed opposite the rotary plate so as to leave a gap, pivotable ratchets (36) are disposed on the rotary plate and can be supported against projections (35a) of the rotary plate and can interact with steps (37a) of the support bearing such that, when the winding mandrel (2) and the rotary plate (35) rotate opposite the winding direction, the ratchets (37a) are supported against the projections (35a) and against the steps (37a) and press the rotary plate away from the support bearing, against the spring force, whereby the winding sleeve (3) is released, but when the rotary plate (35) is rotated in the winding direction, the ratchets can glide freely over the steps (37a), wherein the corresponding approach of the rotary plate (35) toward the support bearing (37) brings about the captive hold of the winding tube.
15. The device according to any one of claims 2 to 5, characterized in that the tubular sleeve (7) is connected, for rotation, to the winding mandrel (2) via a longitudinal slot (8) formed in the tubular sleeve and to a pin (9), which engages into said longitudinal slot and is mounted on the winding mandrel.

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