Wireworking – Article making or forming – Forms and frames
Patent
1996-07-12
1998-01-20
Larson, Lowell A.
Wireworking
Article making or forming
Forms and frames
B21F 300
Patent
active
057092516
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a method for winding coils made of conductor wire for electric motors or generators, particularly those with a large number of poles or with distributed wave winding or distributed loop winding, wherein a first coil or coil group is created on a template by means of a circulating wire guide, is stripped off the template into a receiver with circularly disposed slits and is moved on by a rotating movement of the receiver, whereupon, without a break in the wire, at least one further coil or coil group is created and stripped off into the receiver wherein, following the termination of the winding process of the first coil or coil group, the wire is grasped by a holder between the wire guide and the template, at the time of the start of the winding process of the further coil or coil group is clampingly held radially outside of the receiver at a point in the transition area between the sequentially wound coils or coil groups, and following the creation of the last continuously wound coil is cut off behind an end section projecting away from it for a defined length. The invention also relates to a device for executing such a method.
BACKGROUND OF THE INVENTION
Normally, a clamping and cutting device is attached to the machine frame at one side of the template, and a so-called length pulling device on the other side of the template of known winding devices. These are two different devices with different functions. The clamping and cutting device is only needed at the very end of a winding process, after winding of all continuously wound coil or coil groups is finished and the conductor wire must be cut. At the end of the winding process the clamping and cutting device moves into a 9rasping position for this purpose, wherein it receives the wire extending between the template and the wire guide, usually called a flyer, which has been stopped at a defined point in its path of rotation. The clamping and cutting device only needs to perform a simple movement which can be adjusted in such a way that the wire is cut at a defined distance from the template, i.e. so that it has a defined end length projecting away from the coil. Prior to the cutting process the wire is clamped between the cutting members and the flyer and is clampingly held until the start of winding of a fresh coil.
In contrast to this, the length pulling device is needed to temporarily grasp the wire in a transition area between respectively two coils or coil groups which are being continuously wound, i.e. without a break in the wire with a so-called inter-pole connection, to pull out a defined length of wire corresponding to the required length of the inter-pole connection and to clamp the wire at the start of winding. A length pulling device of this type has been described, for example, in German Patent Publication DE 30 24 219 A1. In connection with the known winding devices it is necessary to fasten the length pulling device on the machine frame either on the one side or the other side of the template, depending on the coils to be produced. Retooling and fresh adjustment is comparatively complicated and time-consuming. The clamping and cutting device must also be capable of being changed from the one side to the other side of the template in accordance with the different winding requirements.
In accordance with German Patent Publication DE 41 32 953 C1, a combined length pulling, clamping and cutting device has been developed to simplify retooling. It consists of a holder, which can be moved in a circle around the template and can grasp the wire which extends after a winding process from the flyer to the template at different points, and it can draw, while being guided on a defined path, a defined length of wire, measured from the template or the last wound coil, by grasping the wire only loosely, before the holder clamps the wire, possibly cuts it, and moves it to a predetermined location for starting the winding of the next coil.
The last mentioned known length pulling, clamping and cutting dev
REFERENCES:
patent: 4396042 (1983-08-01), Hamane et al.
patent: 4470436 (1984-09-01), Kubota et al.
Larson Lowell A.
STATOMAT Spezialmaschinen GmbH
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