EP2589695B1 - Method for automatically coiling a spool and a thread spool and coiling device for carrying out the method - Google Patents

Description

The invention relates to a method for automatically winding a spool from a spool of thread. On the one hand, the invention relates to a winding device for carrying out the method and a sewing machine with such a winding device.

A sewing machine with an automatic winding device is known from the EP 2 088 229 A1 , From the DE 36 288 03 A1 a coil sorting device is known. The DE 39 42 304 A1 describes a method and apparatus for detecting a yarn package. The DE 198 36 071 A1 describes a method for residual thread detection. Corresponding methods and devices for the detection of residual thread are described in US Pat DE 1 98 51 751 A1 , of the DE-OS 2 056 427 , of the DE 87 01 858 U1 and the DE 101 40 636 C1 , From the DE 101 43 378 A1 a bobbin thread winding device is known. The EP 0 979 795 A2 describes a method for detecting thread residues on spinning head sleeves.

It is an object of the present invention to develop an automatic winding method such that increased quality assurance standards with respect to the wound coils are taken into account.

This object is achieved by an automatic Aufspulverfahren with the given in claim 1 steps.

According to the invention, it has been recognized that a safe thread length of an automatically wound reel can then be specified exactly and thus used for sewing, if it is ensured that no residual thread has been found on the reel when being spooled, that is always wound starting from an empty reel , By within the automatic Aufspulverfahrens contained residual thread determination is ensured that after the automatic winding coils are produced within narrow limits exactly defined yarn or thread length and in particular coils with accurately defined within narrow limits coil dimensions.

The advantages of a winding device according to claim 2 correspond to those which have already been explained in connection with the automatic winding method according to the invention. Depending on the process status, the signal transmitter emits either the signal "remaining thread", "reel correctly rewound" or "reel not correctly reeled" or controls the reel drive.

An optical residual thread sensor according to claims 3 to 5 can be designed with high precision. The light source and the light detector may be combined in one unit; but can also be designed as spaced-apart components. A guide of a detection light beam of the residual thread sensor can take place parallel to a coil axis of rotation. Alternatively, such a guide can also be made skewed to the coil axis of rotation.

A revolution counter according to claim 6 and a length sensor according to claim 7 are variants of a residual thread sensor, which can be realized with little design effort.

A tactile sensor according to claim 8 can be made robust. A prestressing according to claim 9 facilitates the handling of a tactile residual thread sensor. The bias can be done by means of a magnet and / or with the aid of a biasing spring. About a contact finger design of the residual thread sensor, a residual thread can also over a Circuit are detected, which is only between the contact finger and the coil is not closed, if there is still residual thread on the coil.

Alternatively, the winding device according to the invention can also be used generally for the coil fill level test. In this case, the residual thread sensor is arranged as a level sensor so that it detects whether a certain thread winding height is reached on the spool. In particular, the residual thread sensor can be arranged so that it can be reliably detected whether the bobbin is fully wound. In the automatic rewinding process using such a level sensor, the level check is performed after the automatic rewinding operation is completed. If the level check indicates that a predetermined winding state has been reached, the wound coil is released. Such a level sensor can also be used to check the level of coils that were wound at an earlier time and whose level is to be controlled.

The advantages of a sewing machine according to claim 10 correspond to those which have already been explained above with reference to the winding device according to the invention.

Fig. 1

schematisch eine Vorderansicht einer Nähmaschine mit einer Spuleinrichtung zum Aufwickeln einer Spule von einer Garnrolle;

Fig. 2

vergrößert einen Ausschnitt aus Fig. 1, bei der Details einer Ausführung eines Restfadensensors zur Ermitteln eines Restfadens auf einer Spule, die mit der Spuleinrichtung aufgespult werden soll, schematisch näher dargestellt sind;

Fig. 3

einen Schnitt gemäß Linie III-III in Fig. 2, wobei nur die Spule und Komponenten des Restfadensensors dargestellt sind;

Fig. 4

in einer zu Fig. 2 ähnlichen Darstellung eine weitere Ausführung eines Restfadensensors, der als taktiler Sensor mit einem Kontaktfinger ausgebildet ist; und

Fig. 5

in einer zu Fig. 3 ähnlichen Darstellung eine weitere Ausführung eines optischen Restfadensensors.

Embodiments of the invention will be explained in more detail with reference to the drawing. In this show:

Fig. 1

schematically a front view of a sewing machine with a winding device for winding a spool of a spool of thread;

Fig. 2

enlarges a section Fig. 1 in which details of an embodiment of a residual thread sensor for determining a residual thread on a spool, which is to be wound with the winding device, are shown schematically in more detail;

Fig. 3

a section along line III-III in Fig. 2 wherein only the coil and components of the residual thread sensor are shown;

Fig. 4

in one too Fig. 2 a similar embodiment, a further embodiment of a residual thread sensor, which is designed as a tactile sensor with a contact finger; and

Fig. 5

in one too Fig. 3 similar representation of a further embodiment of an optical residual thread sensor.

A sewing machine 1 has a housing 2 with an arm 3 and a stand 4. A needle bar 5 is driven up and down with a sewing needle 6 via an arm shaft extending in the arm 3. A sewing thread is fed via a thread guiding device 7 with a predetermined thread tension.

The sewing machine 1 has a winding device 8 for winding a yarn package from a yarn roll 9. A aufzuspulender thread 10 is thereby fed via a boom 11 and yarn guide components of the yarn guide device 7 of the winding device 8.

The winding device 8 has a Spulaufnahme 12 for receiving a coil 13, as in the prior art, for example from the EP 2 088 229 A1 is known. Furthermore, the winding device 8 has a winding drive, over which a winder shaft 14, on which the coil 13 is attached, is rotationally driven. The winding drive, which is formed for example via a friction wheel, which is driven by an arm shaft of the sewing machine, is shown schematically at 15 in the drawing.

The winding device 8 has a residual yarn sensor for detecting a residual yarn on the spool 13. Different versions of the residual yarn sensor are described below with reference to the FIGS. 2 to 5 explained. The residual thread sensor is in the Fig. 1 schematically shown at 16. Furthermore, the winding device 8 has a signal generator 17, which is in signal manner not shown in a manner not shown both with the winding drive 15 and with the residual yarn sensor 16. Depending on the embodiment of the winding device 8, the signal generator 17 is designed for outputting a status signal, for example a light signal, an acoustic signal or via a display for outputting a plain text signal and / or for outputting a control signal for the winding drive 15. The output signals may be, for example, one of the signals "residual thread", if a residual thread on the spool 13, ie on the bobbin, is detected by the residual thread sensor 16, the signal "coil wound correctly" or the signal "coil not correctly wound up "act.

The FIGS. 2 and 3 show details of a first embodiment of the residual thread sensor 16. This comprises a transmitting unit in the form of a light source 18 and a receiving unit in the form of a light detector 19. In a further embodiment of the residual thread sensor 16 may be arranged in place of the light detector 19, a reflector, one of the light source 18 emitted light beam 20 reflected back into itself. In this case, instead of the light source 18, a transmitting / receiving unit is arranged, which in addition to the transmitting function also includes a detection function.

The light source 18 and the light detector 19 are arranged so that the light beam 20 is guided past a bottom 21 or a lateral surface of the coil 13 just below. When a residual thread is present on the bottom 21 of the spool 13, the light beam 20 between the light source 18 and the light detector 19 is interrupted by the residual thread. The residual thread sensor 16 with the light source 18 and the light detector 19 is designed as a light barrier sensor.

Fig. 3 shows two arrangement variants on the one hand for the light source 18 and on the other hand for the light detector 19, which are provided with the letters a and b. The residual thread sensor 16 after the FIGS. 2 and 3 can be optically designed so that it optically scans the entire bottom 21 of the coil 13, so that it can be reliably determined whether somewhere on the spool 13, a residual thread is wound up.

During automatic winding of the spool 13 from the spool 9 of the spooling device 8, the spool 13 is first inserted into the Spulaufnahme 12 of the winding device 8. Subsequently, it is determined with the residual thread sensor 16 whether there is a residual thread on the inserted bobbin 13 or not. If no residual thread is detected, the signal generator 17 controls the winding drive for winding the coil 13. After the winding has taken place, the signal generator 17 outputs the signal "Coil wound correctly". If a residual thread is detected, the signal generator 17 outputs the signal "residual thread". A winding does not take place then. The coil 13 with the remaining thread can then be removed from the Spulaufnahme 12 and replaced with another aufzuspulende coil 13. Alternatively, the remaining thread from the coil 13 can be removed.

In an alternative, not shown in the drawing embodiment, the light source 18 and the light detector 19 are arranged so that the light beam 20 is guided parallel to a coil rotation axis of the coil 13 in turn just above the bottom 21 and a lateral surface of the coil 13. Recesses are provided in this case in the side walls of the coil 13 and possibly in over the bottom 21 projecting intermediate elevations of the coil base, that the light beam 20 when no residual thread on the bottom 21 of the coil 13, at least once during a complete revolution of Spool 13 can run continuously between the light source 18 and the light detector 19. A residual thread is present on the coil 13 when, in this embodiment, not shown, during a complete rotation of the coil 13, no light signal arrives at the light detector 19.

Fig. 4 shows a variant of the residual thread sensor 16. This is designed as a tactile sensor with a contact finger 22, which can be brought with a lateral surface of wound on the spool 13 yarn or when the spool 13 is empty, with the bottom 21 of the coil 13 into contact. The contact finger 22 is pivotable about a hinge 23 which is parallel to the winder shaft 14 and fixed to the housing 2 of the sewing machine 1. Via a magnet 24, which is attracted by a magnetic adjusting body 25, the contact finger 22 against the lateral surface, that is ultimately biased against the bottom 21 of the coil 13. The adjusting body 25 is mounted fixed to the housing and can be adjusted in its position for adaptation to the respective coil geometry. Dashed is in the Fig. 4 a swung-out position of the contact finger is shown at 22 '.

When automatically winding with the winding device 8 with the residual thread sensor 16 after Fig. 4 is determined tactually via the contact finger 22, whether a residual thread is wound on the coil 13 inserted into the spool holder 12. A residual thread is not present when the contact finger 22 is fully pivoted, that touches the bottom 21 of the coil. In this position, the magnet 24 comes into contact with the adjusting body 25, so that a signal is transmitted to the signal generator 17. In this way, a distinction between the situations "residual thread on the spool" and "no residual thread on the spool" is possible, analogous to what above in connection with the residual thread sensor 16 after the FIGS. 2 and 3 and the automatic winding method has already been explained.

The contact finger 22 may in a further variant of the residual thread sensor, which otherwise like the residual thread sensor after Fig. 4 is constructed, are also used for electrical detection of a residual thread. In this case, a tip of the contact finger 22, when coming into contact with the bottom 21 of the coil 13, closes a circuit. If the circuit does not close when contacting the tip of the contact finger 22 with the bottom 21 of the coil 13, there is residual thread between the tip and the bottom, so that the signal generator 17 in turn outputs the signal "residual thread".

Fig. 5 shows a variant of an optical residual thread sensor 16. This has a transmitting / receiving unit 26, for in Fig. 5 again two alternative positions are indicated. The transmitting / receiving unit 26 includes a light source and a light detector. The arrangement of the transmitting / receiving unit 26 is such that when inserted into the coil receiving 12 coil 13, a light beam 27, which is emitted from the light source of the transmitting / receiving unit 26, perpendicular to the bottom 21 of the coil 13 falls. The bottom 21 is formed as a reflection surface for the light beam 27. If there is no residual thread on the bottom 21, the light beam 27 is reflected back into itself and reaches the light detector of the transmitting / receiving unit 26. In the case of the remaining thread, the light beam 27 between the light source and the light detector of the transmitting / receiving unit 26 is interrupted. The function of the residual thread sensor 16 after Fig. 5 during automatic winding of the coil 13 corresponds to the one above in connection with the remaining thread 16 after the FIGS. 2 and 3 has already been explained.

In another, not shown in the drawing variant of an optical residual thread sensor, a light beam emanating from a light source of the residual thread sensor, again parallel to the coil axis of rotation of the coil 13 just above the bottom 21 of the coil 13. The light beam penetrates through an opening in one of the two coil side walls in the coil 13 and is reflected back on the opposite side wall. If there is no residual thread on the coil 13 in this embodiment of the residual thread sensor, the situation arises per revolution that the light beam reflected back in itself is detected by the detector of the transmitting / receiving unit of this residual thread sensor. If there is no detectable light signal even with a complete rotation of the coil 13 in this variant, the signal generator in turn emits the signal "residual thread".

In a further variant of the residual thread sensor is a revolution counter 28 (see. Fig. 1 ) executed for counting revolutions of the coil 13 during winding. In this case, use is made of the fact that, in order to wind up the bobbin 13 starting from a completely empty bobbin, that is to say a bobbin without residual thread, a precisely predetermined number of revolutions of the bobbin winder shaft 14 is required within a narrow range. At the winding device 8, which uses the revolution counter 28 to detect the residual thread, the automatic winding method proceeds as follows: After winding the spool 13, ie after a certain spool diameter has been reached, it is determined how many revolutions of the spool shaft 14 were required to completely wind up the spool 13. If this number of revolutions is smaller than the known number of revolutions required to completely wind up an empty reel 13, the signal generator 17 outputs the signal "reel not spooled correctly". The coil 13 can then be sorted out. Alternatively, the remaining thread detection via the revolution counter 28 can take place in that the reel 13 is wound until the number of revolutions of the winder shaft 14, which is required for the complete winding of the reel 13, is reached, monitored by the revolution counter 28. Subsequently, it is checked whether too much yarn is wound on the spool 13 or not, which can be done by a diameter check of a yarn volume on the spool 13. If the check reveals that too much yarn is wound onto the reel 13, the signal generator 17 in turn outputs the signal "reel not correctly reeled", so that the reel 13 can be sorted out. If the check with the aid of the revolution counter 28 reveals that starting from an empty reel 13, the signal generator 17 outputs the signal "Coil correctly reeled". The revolution counter 28 may be formed, for example, as a magnetic sensor.

As an alternative to a revolution counter 28, a length sensor 29 may also be provided which measures a length of the thread 10 wound on the spool 13. If, when fully wound up coil 13, that is, when when winding a nominal diameter of the coil 13 is reached, this length is too short, a residual thread on the coil 13 must have been present at the beginning of winding. If in an alternative automatic winding process a predetermined thread length, which is required for complete spooling when the spool 13 is empty, was monitored by the length sensor 29 and then turns out to be wound on the spool 13 by a diameter comparison of the wound up yarn volume, this likewise allows a conclusion to be drawn thereon; that before the start of winding still residual thread must have been present on the spool 13. The function of the length sensor 29 therefore corresponds to the function of the revolution counter 28, so that the signal generator 17 can be controlled accordingly, as has already been discussed above. The length sensor 29 can be designed, for example, as an optical sensor.

Claims (10)

1. Method for automatically winding a bobbin (13) from a yarn reel (9) with a winding device (8) having the following steps:

   - inserting a bobbin (13), which is to be wound, into a bobbin receiver (12) of the winding device (8),

   - determining a remaining thread on the inserted bobbin (13),

   - winding the bobbin (13) or releasing the wound bobbin (13) only when the determination step produces the fact that the inserted bobbin (13) carries no remaining thread.
2. Winding device (8) for carrying out the method according to claim 1

   - with a bobbin receiver (12) for receiving a bobbin (13),

   - with a winding drive (15),

   - with a remaining thread sensor (16) for determining a remaining thread on the bobbin (13),

   - with a signal transmitter (17), which has a signal connection to the remaining thread sensor (16).
3. Winding device according to claim 2, characterized in that the remaining thread sensor (16) has a light source (18; 26) and a light detector (19; 26).
4. Winding device according to claim 3, characterized in that the remaining thread sensor (16) is configured as a light barrier sensor.
5. Winding device according to claim 3 or 4, characterized in that a bobbin face (21) of the bobbin (13) arranged in the bobbin receiver (12) can be used as a reflector in the light path between the light source (26) and the light detector (26).
6. Winding device according to claim 2, characterized in that the remaining thread sensor (16) is configured as a revolution counter (28) to count the revolutions of the bobbin (13) during winding.
7. Winding device according to claim 2, characterized in that the remaining thread sensor (16) is configured as a length sensor (29) to determine a length of a wound thread (10).
8. Winding device according to claim 2, characterized in that the remaining thread sensor (16) is configured as a tactile sensor with a contact finger (22), which can be brought into contact with a lateral surface of the bobbin (13).
9. Winding device according to claim 8, characterized in that the contact finger (22) can be pretensioned against the lateral surface.
10. Sewing machine (1) with a winding device (8) according to any one of claims 2 to 9.

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