EP1496003B1 - Automatic bobbin changer for an automatic winding machine - Google Patents

Abstract

An automated parallel bobbin (S) winding assembly has a thread moving feed guide (5) and a bobbin turntable magazine that step-advances empty bobbins to the winding station. Empty bobbins bear a residual length of yarn that is attached by knotting to the next yarn feed presented by the feed guide.

Description

The present invention relates to an automatic bobbin changer for a parallel automatic winder, comprising a winding station having a yarn-laying unit for the bobbin winders and a magazine for receiving the bobbins.

In a known Parallelspulautomaten of this kind, the AP-Winder Hacoba, the magazine is formed by a sloping chute on which the empty spools slide to the winding station and the full coils remain until they are removed. This system does not allow a safe supply of empty tubes, as this strongly depends on the friction between the coil and slide. In addition, the required to avoid damage to the coil surface separation of the coils can be realized at the winding station only with considerable mechanical effort.

The invention will now be given a bobbin changer for a parallel winder, which allows a safe supply of empty bobbins to the winding station and a coil separation with simple means. In addition, the automation of coils, especially when winding on to be further improved.

This object is achieved according to the invention that the magazine is formed by a turntable for the stepwise transport of empty bobbins and the full bobbins of the winding station, wherein the empty bobbins contain a Gamrest, and that in the area of the winding station a Knoter for Connection of the yarn residue is provided on the next empty bobbin to be spooled with the bobbin supplied by the thread-laying unit.

When the bobbin changer according to the invention, the empty bobbins are conveyed by rotation of the turntable to the winding station, wherein the bobbins no longer have to be separated. By the knotter for connecting the Gamendes a full bobbin with the yarn residue on the next empty bobbin winding can be done virtually fully automatically.

In US-A-4 154 411 a bobbin changer is described with a special winding station for the production of starter coils, which have a few turns of thread and a fixed thread beginning. When changing bobbins, the full bobbin is exchanged for a starter bobbin and then the thread end of the starter bobbin is linked to the bobbin thread.

A first preferred embodiment of the bobbin changer according to the invention is characterized in that the connection of the said yarn residue and the bobbin thread by knotting the gauze takes place at the running from the just fully wound bobbin to the yarn guide thread laying yarn, which is after the node between the node and the full Coil is severed.

A second preferred embodiment is characterized in that the turntable receiving points for the coils and at each receiving point holding means for one end of Gamrests positioned at the receiving point coil, which are provided for presenting said end of Gamrests to the Knoter.

A third preferred embodiment of the bobbin changer according to the invention is characterized in that the said holding means are formed by Gamklemmstifte projecting from the turntable to which the end of each Gamrests can be applied.

A fourth preferred embodiment is characterized in that each receiving point is assigned two yarn clamping pins arranged on both sides of the receiving point and thus of the spool positioned in this position, the free end of the yarn residue being guided by the spool on the one hand and from this to the other yarn clamping pin on the latter is fixed.

A fifth preferred embodiment of the bobbin changer according to the invention is characterized in that the free end of the yarn residue extends between the two Gamklemm pins in a position tangential relative to the turntable.

A sixth preferred embodiment is characterized in that the knotter is arranged in the direction of rotation of the turntable immediately after the winding station, and that after completion of the winding process, the relevant full bobbin transported from the winding position to the next receiving location corresponding rotational position of the turntable and presented to the knotter in which the end of the wound-up yarn runs from the full bobbin to the thread guide of the thread laying over the yarn-clamping pins associated with the bobbin positioned in the winding station.

A seventh preferred embodiment of the bobbin changer according to the invention is characterized in that both the said end of the yarn wound on the full bobbin and the free end of the yarn residue of the bobbin positioned in the winding station are guided over the yarn binding pins associated with the bobbin positioned in the winding station.

A further preferred embodiment is characterized in that the two mentioned Gamenden be presented together to the Knoter and knotted together by this and the node is separated from the full bobbin.

A further preferred embodiment of the bobbin changer according to the invention is characterized in that at the beginning of the winding process the bobbin positioned in the winding station is pulled back to the bobbin by the rotation of which the free end of the yarn residue of this bobbin is wound up.

Fig. 1

eine schematische Ansicht der Spulstation und des Spulenwechslers eines Parallelspulautomaten in perspektivischer Darstellung,

Fig. 2

eine Explosionsdarstellung des Spulenwechslers von Fig. 1,

Fig. 3

eine perspektivische Darstellung eines für das automatische Anknoten erforderlichen Zubehörs des Spulenwechslers von Fig. 1 und 2; und

Fig. 4

Diagramme zur Funktionserläuterung.

In the following the invention will be explained in more detail with reference to an embodiment and the drawings; it shows:

Fig. 1

a schematic view of the winding station and the bobbin changer of a parallel winder in a perspective view,

Fig. 2

an exploded view of the bobbin changer of Fig. 1,

Fig. 3

a perspective view of a required for automatic Anknoten accessory of the bobbin changer of Figures 1 and 2. and

Fig. 4

Diagrams for the explanation of functions.

The winding station shown in Fig. 1 consists essentially of an aluminum profile 1 with a arranged in the region of the upper end motor 2 for driving a coil S during the winding process, consisting of an upper part 3 and a lower part 4 means for fixing The thread laying 5 is of the type described in EP-A-1 209 114 and comprises a thread guide F, with a running over deflection rollers 6, 7, flexible , motor driven traversing element 8 is connected and a traversing movement in the longitudinal direction of the coil S, ie in the vertical direction, executes. The guide roller 6 is designed as a drive wheel for the drive of the traversing element 8 and the guide roller 7 is designed as a biasing member for the compensation of voltage fluctuations of the traversing element. For further details of the yarn laying 5 reference is made to EP-A-1 209 114, the disclosure of which is incorporated herein by reference.

The winding station is associated with a bobbin changer shown in more detail in FIG. 2, which essentially has a motor-driven carousel-type turntable 9, which is fastened on a rotatable axle disk 10. The turntable 9 and the axle 10 and other components of the bobbin changer are mounted on a plate-like carousel holder 11 mounted on the automatic winder. The drive of the turntable is effected by a driven by a stepper motor 12 friction wheel 13 which engages the circumference of the turntable 9. The stepper motor 12 is mounted on a motor support 22 connected to the carousel holder 11.

The turntable 9 has a plurality, as shown four, receiving positions for coils S; The centering of the drawn in Fig. 2 dash-dotted coils at the receiving positions carried by a at the top of the turntable 9 replaceably mounted centering 14, which has recesses or steps 15 at the receiving positions, whose diameter corresponds to the diameter of the edge discs 16 of the coil S and which define the pickup positions. Depending on the diameter of the edge discs 16 different centering 14 are used, which, as can be seen from the figures, edge discs 16 with a large diameter over the edge of the turntable 9 and the centering 14 can protrude laterally. The recesses 15 of the centering disc 14 are not complete circles in this case, so that the centering disc 14 has approximately the shape of a Maltese cross.

The turntable 9 has at each receiving position, a first bore 17 which is provided for the passage of the lower part 4 of the means for fixing the coil S in the winding station. Each of the first holes 17 has at the edge of a groove-shaped recess 18 which is provided for engaging a spring-mounted locking pin 19. Each position of the turntable 9 is detected individually by a sensor 20 arranged on the carousel holder 11. This is a reed contact, which is actuated by a next to each first bore 17 provided second bore 21. The illustrated embodiment of the turntable 9 with four receiving positions is to be understood only as an example, of course, could be provided when using coils S with smaller marginal discs 16 more than four receiving positions.

In operation of the automatic winder containing a Gamrest, empty coils S are placed in the recesses 15 of the centering disc 14 on the turntable 9, which is driven by the friction wheel 13 in the counterclockwise direction (seen from above). If there is no spool S at the winding station, or if a spool is currently fully spooled, the turntable 9 is rotated by one pitch and the next empty spool S is transported to the winding station. The winding machine recognizes the completion of the winding process on the basis of the wound-up yarn length, which is measured directly via the delivery mechanism, or on reaching the coil diameter corresponding to a full bobbin. An arranged in the winding station full coil sensor 23 is the automatic winder, if no empty coil is more on the turntable 9.

Once an empty bobbin reaches the winding station and the corresponding rotational position of the turntable 9 is fixed by the locking pin 19, the coil S between the upper part 3 and the lower part 4 of the holding device is clamped and fixed and it starts the winding process by starting the engine 2 and the thread laying 5. Upon completion of the winding operation, the motor 2 and the thread laying 5 are stopped, the bobbin in question is released from the holding means 3, 4, the locking pin 19 is released and the turntable 9 is further rotated by one pitch. The full spool can now be removed.

The clamping and cutting of the yarn is done by a arranged in the direction of rotation of the turntable immediately after the winding station, attached to the aluminum profile 1 Knoter 24. The Knoter 24, which is a so-called Fischer Knoter, connects the end of the yarn on a finished in the winding station put full bobbin S with the Gamrest on the next empty bobbin, cut the yarn and release it after starting the engine 2 free.

The knotter 24 shown only schematically in Fig. 1 essentially comprises a slot 25 for inserting the threads to be knotted together and a knotting mechanism, not shown. The knotter 24 is attached to the lower end of an angle section 26 which is pivotally mounted at its upper end to a bearing bracket 27 attached to the aluminum profile 1. On the bearing bracket 27 and at the lower end of the angle section 26 is ever a tab 28th mounted on which one or the other end of a symbolized by a dashed line 29 pneumatic cylinder is clamped. The knotter 24 takes in its rest position one of the clamped and to be cut yarn spaced position and is pivoted by actuation of the pneumatic cylinder between rest position and working position, in the latter, the yarn is inserted into the slot 25. The pivotal movement of the knotter 24 is symbolized by a double arrow P.

1, the centering disc 14 between the recesses 15 holes 30, which are provided together with holes in the center of the turntable 9 for screwing fastening screws (not shown) for a Knotvorlageelement 31. The Knotvorlageelement 31 also has corresponding holes 30. The Knotvorlageelement 29 shown in Fig. 3 has according to the representation of the number of receiving positions on the turntable 9 corresponding number of wings 32, whose interstices are larger in diameter than the recesses of the centering disc 14. The Knotvorlageelement 31, which instead of one piece and from may consist of individual segments, carries on each wing 32, in the region of its outer edge two spaced Gamklemmstifte 33, each of which consists of a fixed lower part 34 and a resiliently pressed against the lower part 34 upper part 35. The two parts 34 and 35 of each Garnklemmstifts 33 are provided at their contacting surfaces with a chamfer (fold), so that a groove or groove for the insertion of a yarn is formed on the contacting surfaces.

When loading the automatic winder with an empty spool S, the operator puts the coil in question in an empty recess 15 of the centering 14, takes the end of the bobbin on the bobbin, puts the yarn first in the groove of the turntable in the direction of rotation 9 immediately behind Spool S positioned first Gamklemmstifts 33 and then leads it to the direction of rotation of the turntable 9 immediately before the coil in question positioned second Garnklemmstift 33, where it winds the yarn at the location of the groove several times around the second Garnklemmstift 33 and thereby clamps. The yarn which has been guided once around the first yarn-clamping pin 33 and wrapped around the second yarn-clamping pin 33 is now stretched between the two yarn-clamping pins 33 in a defined position.

The diagrams of Fig. 4 show schematically the sequence at the node, wherein the coils are denoted by S ₁ to S ₄ and their positions with A to D; the reference A denotes the winding position. In the state shown in the diagram 4a, the coil S _{1 is} currently in the winding position A and is almost full. In position B there is an empty bobbin S ₂ , in the position C a likewise empty bobbin S ₃ and in position D a full bobbin S ₄ . The two empty bobbins S ₂ and S ₃ are prepared for the knotting, the free end of the yarn residue on them is spanned between the respective Gamklemmstiften 33. From the bobbin S ₁ in the winding position A, the yarn that has just been wound onto the thread guide F runs Thread laying 5 (Fig. 1), and the free yarn end of the wound on the full bobbin S ₄ yarn runs to the front in the direction of rotation R of the turntable 9 Garnklemmstift 33 at the winding position A and is firmly clamped there.

As soon as the coil S _{1 is} full, the turntable 9 rotates in the direction of rotation R by a pitch, so that the coil S ₁ in the position D and the coil S ₂ enters the winding position A. With this rotation of the turntable 9 of the extending from the coil S ₁ to the yarn guide F yarn is over the coil S set ₂ associated Gamklemmstifte 33 and now runs directly next to or above the free end of Gamrests on the spool S ₂ via the said Gamklemmstifte 33 This condition is shown in diagram 4b.

Now, the knotter K (FIG. 1) is pivoted in the direction of the arrow K (diagram 4c) against the gamends stretched over the Gamklemmstifte 33 at the winding position A, wherein these yarn ends enter the slot 25 and are knotted. Now, the yarn guided by the yarn guide F, auszuspulende yarn with the end of the wound on the full bobbin S ₁ yarn and the Gamrest on the empty bobbin S _{2 is} connected. Immediately after the knotting, the knotter cuts off the yarn from the knot to the spool S ₁ extending yarn and then pivots back in the direction of the arrow K in its rest position. The wound on the bobbin S ₁ yarn is now separated from the node and its free end is fixed to the front in the direction of rotation R of the turntable 9 Garnklemmstift 33 at the winding position A.

Now begins the spooling of the coil S ₂ , wherein the yarn guide F as it moves in the vertical direction, the knot just pulled back together with the yarn ends connected by him in the direction of arrow T (Diagram 4 d), so that on the coil S ₂ of the yarn delivery (not shown) yarn is wound over the node. As soon as the coil S _{2 is} full, the coil S ₃ enters the winding position A. The turntable 9 then carries four full coils S ₁ , S ₂ and S ₄ , which, if possible during the winding of the coil S ₃ removed from the turntable 9 and should be replaced by empty coils.

If the paralleling machine shown does not have a knotter 24 and, accordingly, no knot template element 31, empty tubes without a gamrest are used. The yarn is clamped before the bobbin change in the upper part 3 of the means for fixing the coil S (Fig. 1) and then cut automatically. Then, the new sleeve is clamped and the lower part 4 driven up, the yarn beginning is left so free that it comes to rest under the first layer of yarn.

Since on reel machines usually very fine yarn is spooled, the production of a full bobbin takes up to several hours, so that it is sufficient in the bobbin changer shown when an operator goes every few hours to the automatic winder, the full bobbins decreases and refills empty bobbins.

Claims (10)

1. An automatic bobbin changer for a parallel automatic bobbin winder, having a winding station including a thread advancing unit (5) for winding thread onto bobbins (S) provided with terminal flanges, and having a magazine for receiving the bobbins (S), characterised in that the magazine is formed by a turntable (9) for the stepwise transport of empty bobbins (S) to the winding station and of full bobbins (S) therefrom, with the empty bobbins (S) having a residual yarn, and in that in the region of the winding station a knotting unit (K) is provided for connecting the residual yarn on the next empty bobbin (S₂) onto which yarn is to be wound to the winding yarn supplied from the thread advancing unit (5).
2. A bobbin changer according to Claim 1, characterised in that the connection of the said residual yarn and the winding yarn is made by knotting the residual yarn to the piece of yarn running from the bobbin (S₁) which is currently being filled by winding to the thread guide (F) of the thread advancer (5), this piece of yarn being severed after the knotting between the knot and the full bobbin (S₁).
3. A bobbin changer according to Claim 1 or 2, characterised in that the turntable (9) has receiving points (15) for the bobbins (S) and, at each receiving point (15), holding means for an end of the residual yarn of the bobbin (S) positioned at the receiving point (15), which are provided to present the said end of the residual yarn at the knotting unit (K).
4. A bobbin changer according to Claim 3, characterised in that the said holding means are formed by yarn clamping pins (33) which project upwards from the turntable (9) and against which the end of each residual yarn may be placed.
5. A bobbin changer according to Claim 4, characterised in that associated with each receiving point (15) are two yarn clamping pins (33) arranged on either side of the receiving point (15) and hence of the bobbin (S) positioned therein, with the free end of the residual yarn being guided from the bobbin (S) to the one and from there to the other of the yarn clamping pins (33) and fixed to the latter.
6. A bobbin changer according to Claim 5, characterised in that the free end of the residual yarn extends between the two yarn clamping pins (33) in a position which is tangential in relation to the turntable (9).
7. A bobbin changer according to one of Claims 4 to 6, characterised in that the knotting unit (K) is arranged, as seen in the direction of rotation (R) of the turntable (9), directly downstream of the winding station, and in that once the winding procedure is complete the relevant full bobbin (S₁) is transported from the winding position (A) to the rotational position of the turntable (9) corresponding to the next receiving point and is presented to the knotting unit (K), with the end of the wound-on yarn of the full bobbin (S₁) extending, by way of the yarn clamping pins (33) associated with the bobbin (S₂) positioned in the winding station, to the thread guide (F) of the thread advancer (5).
8. A bobbin changer according to Claim 7, characterised in that both the said end of the yarn wound onto the full bobbin (S₁) and the free end of the residual yarn of the bobbin (S₂) positioned in the winding station are guided by way of the yarn clamping pins (33) associated with the bobbin (S₂) positioned in the winding station.
9. A bobbin changer according to Claim 8, characterised in that the two said yarn ends are presented together to the knotting unit (K) and are knotted to one another thereby and the knot is severed from the full bobbin (S₁).
10. A bobbin changer according to Claim 9, characterised in that, at the start of the winding procedure of the bobbin (S₂) positioned in the winding station, as a result of rotation thereof the free end of the residual yarn of this bobbin is drawn back to the bobbin and wound onto the latter.

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