EP0169586B1 - Apparatus for winding electric coils with closed cores - Google Patents

Description

The present invention relates to a device for winding electrical coils with closed cores, according to the preamble of claim 1 and is based on US-A-2 962 235.

In the known toroidal coil winding devices, in which annular magazines are guided through the core opening, which are rotatably mounted and circulate around the bobbin, the wire running from the magazine to the bobbin over a discharge roller, are only suitable for relatively large toroidal cores, those with a Outside diameter of about 20 mm is the lowest limit.

In order to be able to wind small toroidal cores in the order of magnitude of <16 mm toroidal core diameter, according to EP-A-0 068 415 a semi-automatic winding method and a device for carrying it out have already been proposed, by means of a magnetizable needle attached to the beginning of the winding wire, to open the wire to wind up the core, the needle being guided under the action of a magnetic field along a closed orbit running partly through the core opening and decreasing in length with increasing winding duration.

By using magnets to guide the needle, however, such a winding device for extremely small cores, for example for video core coils, in the order of magnitude of approximately 3 mm core outer diameter with a core opening of approximately 0.35 mm is not suitable.

From DE-A-2 251 140 a device for winding closed small cores is also known, with catch hooks reciprocating from two sides, the catch hook moving through the core from one side.

The present invention has for its object to provide a device which is suitable for winding extremely small core coils in the order of magnitude of about 3 mm core outer diameter with a core opening up to about 0.35 mm. It is a further object of the invention to design the device in such a way that an automatic workflow is ensured from the wire feed to the fully wound core coil.

The above object is achieved according to the invention by the features of claim 1.

Further developments of the subject matter of the invention are contained in the dependent claims 2 to 5.

The advantage of the invention can be seen in particular in the fact that the coil former is fixed on the coil former receptacle during the entire winding process of the core coil and that the winding wire is constantly held and guided during the winding of the core coil by the total length of the wire section measured for each winding in the Wire holder is clamped, the distance between the wire holder in the winding position and the separating device in each case corresponding to a wire section required for the winding, and on the other hand for each individual winding the winding wire in one of the four wire tensioners is only lightly pressed by an adjustable spring, so that the wire can slip slightly after each turn. The wire is placed on the coil former by means of the catch hook before the rotation of the wire tensioners, whereupon the wire tensioners rotate by 270 ° and one turn is thus placed on the coil former.

The invention will be explained in more detail below using an exemplary embodiment.

• Fig.1 eine Seitensnsicht der erfindungsgemässen Vorrichtung,
• Fig.2 ein Grundriss der Vorrichtung gemäss Fig.1,
• Fig.3, 3', 3"; 3a, 3a', 3b, 3b', 3c, 3c' sind Detaildarstellungen einer erfindungsgemässen Wickeleinheit, jeweils in Ansicht und Grundriss zur Darstellung des Funktionsablaufes der Bewicklung.

Show it

• 1 shows a side view of the device according to the invention,
• 2 shows a plan view of the device according to FIG. 1,
• 3, 3 ', 3 "; 3a, 3a', 3b, 3b ', 3c, 3c' are detailed representations of a winding unit according to the invention, each in a view and plan view to illustrate the functional sequence of the winding.

1 and 2, a support 1 is arranged on a foundation plate 9, for example as a rectangular, rotatable turret, which is designed to be rotatable about the axis of rotation X by 180 °. Arranged on the turret head 1 are two bobbin receptacles 11, 11 ', each of which has a wire holder 12, 12', the one bobbin receptacle 11 'with the wire holder 12' in the region of a coil magazine 52, and the second bobbin holder 11 with the wire holder 12 is in the winding position in the area of a wire feed device 4. The coil magazine 52 is a component of a loading and unloading station 5 which has a transfer device 51. The wire feed device 4 consists of a supply spool 41 for a winding wire 6, a wire guide 42 and a wire brake 43. The actual winding of the bobbin 7 'takes place according to FIG. 1 by a rotatable winding unit 3 which interacts with a wire pulling device 2 according to FIG .

In order to cut the wire length required for the winding of the two legs 72, 73 of each coil former 7 ', laterally adjustable wire deflections 14, 14' and a separating device 13, preferably with two separating points 13, 13 ', are provided for adjusting the wire length between the wire holders 12, 12' . The winding unit 3 consists of a winding head 31 with four wire tensioners 32a, 32b, 32c, 32d, each of which has an adjustable spring 33 for clamping the winding wire 6 exhibit. The winding head 31, together with the wire tensioners 32a, 32b, 32c, 32d, is driven by a winding head drive 34 and can be raised and lowered vertically by an adjusting device 35.

The wire pull-in device 2 consists of a catch hook 22 (as shown in FIGS. 3, 3 ', 3 ") which is guided horizontally in the positions 22-1, 22-2, 22-3, 22-4 in a guide 21 and which holds the wire tensioner 32a, 32b, 32c, 32d and the core opening 71 of the bobbin 7 'is designed to be penetrable, the free wire end 62 of the wire section in the form of a wire loop 61 being pulled through one of the wire tensioners 32a, 32b, 32c, 32d and the core opening 71 Wire tensioners 32a, 32b, 32c, 32d are designed to be rotatable clockwise and counterclockwise with the winding head 31, with a cyclical rotary movement of the wire tensioners 32a, 32b, 32c, 32d in each case by 270 ° via the winding positions A, B, C, D etc. 3b, 3b 'for each turn 81. The individual working positions, in particular the catch hook 22 and the wire tensioner 32a, 32b, 32c, 32d, can be preselected in a known manner by a controlled drive device 10 of the winding device.

• Der über die Führung 42 und die Drahtbremse 43 von der Drahtvorratsspule 41 zugeführte Wickeldraht 6 ist bereits in der Drahthalterung 12 der Spulenkörperaufnahme 11 in der Wickelposition gehalten. Wie in Fig.1 und 2 gezeigt, ist der in der Drahthalterung 12' gehaltene Wickeldraht 6 durch Drehung des als Revolverkopf ausgebildeten Supportes 1 um 180° mit der bereits fertig bewickelten Kernspule 7 in den Bereich der Be- und Entladestation 5 gebracht worden. Durch die Drehung des Revolverkopfes 1 wird der Wickeldraht 6 über eine der beiden Drahtablenkungen 14, 14' -gemäss der Fig.2- geführt, wobei zwischen der in der Wickelposition befindlichen Drahthalterung 12 und der verstellbaren Trenneinrichtung 13, die für eine Kernspule 7 zur Bewicklung erforderliche Länge des Drahtabschnittes festgelegt wird.

The mode of operation of the device according to the invention, as schematically illustrated in FIGS. 3, 3 ', 3 "to 3c, 3c', is as follows:

• The winding wire 6 supplied from the wire supply spool 41 via the guide 42 and the wire brake 43 is already held in the winding position in the wire holder 12 of the bobbin holder 11. As shown in FIGS. 1 and 2, the winding wire 6 held in the wire holder 12 'has been brought into the area of the loading and unloading station 5 by rotating the support 1 designed as a turret head by 180 ° with the core coil 7 which has already been wound. As a result of the rotation of the turret 1, the winding wire 6 is guided over one of the two wire deflections 14, 14 ′, as shown in FIG. 2, between the wire holder 12 in the winding position and the adjustable separating device 13, which is used for a core coil 7 for winding required length of the wire section is determined.

Before the actual winding of the coil former 7 ', the winding wire 6 is accordingly held in the wire holders 12, 12', between which the winding wire 6 is guided in a tensioned manner in the region of the core opening 71 of the coil former 7 'via the wire deflection 14 or 14' and the separating device 13 , This starting position of the winding wire 6 is shown in dashed lines in Figures 3, 3 '.

The catch hook (shown in dashed lines) arranged in the starting position 22-1 immediately outside the wire tensioner 32a in the winding position A is shifted horizontally to the still unwound bobbin 7 'in such a way that it first opens the wire tensioner 32a and then the core opening 71 of the bobbin 7'. penetrates, and with the hook directed downwards lies above the tensioned winding wire 6 according to FIG. 3 "(shown in broken lines) in position 22-2. Subsequently, the catch hook 22 is slightly moved to position 22-3 (in FIG .3 "also shown in broken lines), whereby the winding wire 6 stretched between the wire holders 12, 12 'is caught and held in the hook directly in front of the core opening 71. The winding wire 6 held in this way for the coil former 7 ′ is now separated by the separating device 13. The separating device 13 can be designed such that two mutually adjustable separating points 13, 13 'are provided in order to be able to set the length of the required wire sections for the coil former 7' to be wound and the length of the winding end of the finished core coil 7 as desired. In the latter case, the piece of wire between the separation points 13, 13 'would be eliminated as waste. After the winding wire 6 has been cut off in the separating device 13, the catch hook 22 is withdrawn again from the position 22-3 with the winding wire 6, so that the wire section with the free wire end 62 in the form of a wire loop 61 first of all the core opening 71 of the coil former 7 '. and then passed through the still open wire tensioner 32a until the catch hook 22 with the wire end 62 reaches the position 22-4 and then the wire tensioner 32a is closed (shown analogously in FIG. 3b in partial cross-section) and thus the winding wire 6 is held resiliently. As a result, a quarter (by 900) of the winding of the winding 8 is placed on the first leg 72 of the coil former 7 '- the coil former 7' wound, for example, in the counterclockwise direction. After the wire tensioner 32a is closed, the winding head 31 rotates with the four wire tensioners 32a, 32b, 32c, 32d counterclockwise by 270 ° (in the direction of the arrow with the arrow fully drawn), the wire section being held in the wire tensioner 32a to form the first turn 81 while the other wire tensioners 32b, 32c, 32d turn empty. At the same time, the catch hook 22 is moved from the position 22-4 (shown in broken lines) to the starting position 22-1 of the winding position A.

Initially, the wire tensioners 32a, 32b, 32c, 32d according to FIGS. 3a, 3a 'rotate from positions A, B, C, D (shown in broken lines) to the intermediate positions (with solid lines), the wire tensioner 32a with the held one Wire section after 270 ° rotation of the winding head 31 is brought into position D according to FIGS. 3b, 3b ', with which a full turn 81 was placed on the first leg 72 of the coil former 7'. The one in the floor plan 3a 'shown in FIG. 3a' wire tensioners 32a, 32b, 32c, 32d rotated counterclockwise by 45 ° into the intermediate positions have been omitted for the sake of clarity. The second and subsequent turns 81 of the first leg 72 of the coil former 7 'are wound analogously to the previously described functional sequence according to FIGS. 3, 3', 3 "to 3c, 3c ', only with the difference that the winding wire 6 is already in the In the following, for example second turn, the catch hook 22 is pushed back and forth from its starting position by the following open wire tensioner 32b located in the winding position A and the core opening 71, as already described, whereby the winding wire 6. The wire tensioner 32a, which is located in position D when wound in a counterclockwise direction or in position B when wound in a clockwise direction, is then opened again.

For the sake of simplicity, it is assumed that four full turns are placed on both the first 72 and the second 73 legs of the coil former 7 ', as a result of which the first wire tensioner 32a makes three full turns and moves from position A to positions B, C, D, etc., returns to position A according to FIGS. 3c, 3c '. After the winding of the first leg 72 of the bobbin 7 'has ended, the winding of the second leg 73 takes place by reversing the winding direction — in the present case clockwise — in order to establish a wire connection between the two legs 72, 73 of the bobbin 7 ′ within the core opening 71 avoid, a vertical displacement of the wire tensioners 32a, 32b, 32c, 32d of the winding head 31 takes place, so that the connecting wire from the first to the second leg 72, 73 is not guided over the core opening 71, but at the edge of the core opening 71.

After the catch hook 22 has drawn the winding wire 6 again as a wire loop 61 through the core opening 71 of the bobbin 7 'and through the corresponding wire tensioner 32a, the wire tensioners 32a, 32b, 32c, 32d now turn clockwise, so that the first turn 81 on the second leg 73 of the bobbin 7 'is wound.

After the last, for example, fourth winding 81, the winding of the core coil 7 is completed and the turret 1 rotates with this from the winding position at 180 ⁰ in the region of the loading and unloading station 5, in which simultaneously from the loading and unloading station 5 in the bobbin holder 11 'of the uncoiled bobbin 7' inserted is rotated into the winding position.

In order to be able to lay the turns 81 approximately in layers, the adjusting device 35 according to FIG. 1 is provided, which after each turn 81 or continuously shifts the winding head 31 with the wire tensioners 32a, 32b, 32c, 32d slightly vertically, for example on the first leg 72 of the bobbin 7 'from bottom to top and on the second leg 73 from top to bottom. Depending on the number of turns, the wire tensioners 32a, 32b, 32c, 32d are each adjusted by 90 ° clockwise or counterclockwise.

If the core coil 7 is formed from several, for example from two individual, independent windings on each leg 72, 73 of the coil former 7 ', the winding of the coil former 7' can be carried out on two winding devices 2, 3 arranged on a support 1 designed, for example, as a rotary table respectively.

List of the reference numerals used

• 1 support, revolving turret, possibly a rotary table
• 11, 11 'bobbin receptacles
• 12, 12 'wire mounts
• 13, 13 'separation device, for example with two adjustable separation points
• 14, 14 'wire deflections, laterally adjustable
• 2 wire puller
• 21 Guide for the catch hook, horizontal
• 22 catch hooks
• 22-1, 22-2, 22-3, 22-4 catch positions 3 winding unit, rotatable
• 31 end winding
• 32a, 32b, 32c, 32d wire tensioner with spring-loaded clamps
• 33 springs
• 34 end winding drive
• 35 Adjustment device for the vertical displacement of the wire tensioner
• 4 wire feeder
• 41 supply wire spool
• 42 wire guide
• 43 wire brake
• 5 loading and unloading station
• 51 Transfer device for unwound and wound bobbins
• 52 spool magazine
• 6 winding wires
• 61 wire loop
• 62 wire end, free
• 7 core coil
• 7 'bobbin
• 71 core opening
• 72 first leg of the bobbin
• 73 second leg of the bobbin
• 8 winding
• 81 turns
• 9 foundation plate
• 10 drive device, controllable (computer with screen monitoring)
• A, B, C, D winding positions of the wire tensioner
• X axis of rotation of the support

Claims (5)

1. Apparatus for winding electric coils with closed cores, particularly miniature core coils, comprising substantially at least one coil body receptacle (11, 11') arranged on a support (1), a wire supply device (4) and a loading and unloading station (5) for unwound and wound core coils (7',7), and a wire holder (12, 12'), a wire pulling-in device (2) with a gripping ddevice (22) passing through the core opening (71) of the coil body (7') and a drive device (10), characterised in that on each coil body receptacle (11,11') an associated wire holder (12, 12') is disposed, and that further a winding unit (3) with at least four wire tensioners (32a, 32b, 32c, 32d) disposed in a rotatable winding head (31) and a wire pulling-in device (2) with a gripping device (22) are provided, whereby the gripping device (22) is so movably constructed that it passes through the wire tensioners (32a, 32b, 32c, 32d) and the core opening (71) of the coil body (7') horizontally and that further wire deflectors (14,14') and a severing device (13, 13') are disposed between the wire holders (12,12') for cutting each wire section to length.

2. Apparatus as claimed in claim 1, characterised in that the support (1) is constructed rotatably as a turret head and with at least two core body receptacles (11, 11') for the core bodies (7') and that the wire deflectors (14, 14') are laterally movable.

3. Apparatus as claimed in claim 1, characterised in that an adjusting device (35) is arranged to adjust the wire tensioners (32a, 32b, 32c, 32d) vertically.

4. Apparatus as claimed in claim 1, characterised in that the wire tensioners (32a, 32b, 32c, 32d) provided on the winding head (31) are rotatable with it in the clockwise sense and the anti-clockwise sense for winding both limbs (72, 73) of each coil body (7').

5. Apparatus as claimed in claim 4, characterised in that the cyclical rotary movement of the wire tensioners (32a, 32b, 32c, 32d) after the insertion movement of the gripping device (22) is 270° for each winding.

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