Lindauer Dornier Gesellschaft Mbh

Hans-Joachim Holz

Valentin Krumm

Horst Haeussler

Heinz-Peter Loehr

A reed in a loom is driven or oscillated back and forth to perform the beat-up motion by a direct reed drive that avoids using the main loom drive for operating the reed. The direct drive is an electromagnetic motor which uses as one of its components a reed support shaft ( ) either as a rotor or as a stator. The reed support shaft acting as a rotor carries a reed slay which mounts the reed to the rotor. When the reed support shaft acts as a stator, the reed slay is mounted to separate rotor elements. In both instances the reed support shaft is part of a rotary or linear electromagnetic direct drive motor construction.

Rotary drive with direct drive electromagnetic motor for a reed slay of a loom

A rotating leno forming device includes a leno disk (3) that has leno thread guides (5) therein and that itself forms a part of the rotor (2) of an electromagnetic drive arrangement. In order to achieve a very compact structure, the components are so arranged to achieve an axially directed magnetic flux between the rotor (2) and an electromagnetic stator (10) arranged in the housing (8). A rolling contact bearing rotatably supports the leno disk (3), with a first bearing race (6A) connected to the housing (8) and a second bearing race (6B) connected to the leno disk (3). Permanent magnets (7) are arranged on an annular ring surface (3A) of the leno disk (3) extending along a radial plane, so as to face the electromagnetic stator (10) across an air gap (11) that extends on a radial plane. The thread guides (5) in the leno disk (3) face the stator (10) so that the leno threads (13A, 14A) constantly move through the air gap (11) preventing the accumulation of lint or fibers therein, during operation of the device. An iron yoke ring (3B) may be arranged to rotate with the leno disk (3) or to remain stationary with the stator (10), so as to provide a magnetic return or back circuit.

Rotating leno selvage device with direct electromagnetic drive having

A rotating leno forming device includes a leno disk (3) that has leno thread guides (5) therein and that itself forms a part of the rotor (2) of an electromagnetic drive arrangement. In order to achieve a very compact bearing support arrangement, shield the moving parts against external contamination, and provide for the detection of the rotational position of the leno disk, the leno device further includes a roller or ball bearing (6) of which the outer bearing race (6A) is rigidly connected to the leno disk (3), and of which the inner bearing race (6B) is rigidly connected to a centering holder (9) that is rigidly connected to a housing (8) of the leno device. Permanent magnets (7) are arranged around the circumference of the rotor (2) and cooperate with an electromagnetic stator (11) secured in the housing (8). A position sensor system (10) includes at least one signal emitter (13) mounted on the rotor (2) and a plurality of signal receivers or sensors (14) mounted on the housing (8).

Rotating leno selvage device with direct electromagnetic drive to a leno

A leno selvage device for a loom has a leno rotor ring (7) which is directly driven by its own reversible electric motor, for example, through a power transmission such as a gear belt (6) running around a drive gear pulley (5). The controllable electric motor (20) is operated through a respective program for either oscillating the leno rotor back and forth, e.g. through 180.degree. or for revolving the leno rotor for a number of revolutions in one direction and then for the same number of revolutions in the opposite direction and so forth. The arrangement is such that the central rotational axis (5A) of the drive pulley (5) and the central rotational axis (7A) of the leno rotor ring (7) are positioned in different geometrical planes relative to a carrier arm (2), but in parallel to each other and to the weft insertion direction. The carrier arm (2) provides a plurality of bearing rollers which support the leno rotor ring or disk (7) at the outer circumference thereof by at least two, preferably three guide rollers.

Leno selvage device for a loom with a leno rotor driven by its own motor

A leno device for tying weft threads in the selvage of a fabric is constructed as an electric motor in which the stator is connected to a mounting bracket and the rotor forms the leno rotor disk or ring. A very compact structure results that can be mounted in the free space between the longitudinal struts and heddles of the first heald shafts in the loom.

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Lindau, Germany

Hans-Joachim Holz