Abstract: A diaphragm for a loudspeaker including a plurality of masses, each mass being substantially the same radial distance from the center of the diaphragm, the plurality of masses being divided into two arrays, each array including one or more individual masses, wherein, in use, at a selected frequency, the pair of arrays act to produce a dominant bending moment, and, the center of the diaphragm lies substantially on the axis of the dominant bending moment, wherein, the dominant bending moment is the bending moment produced by the combination of masses which has the greatest magnitude, if they produce more than one bending moment.

Abstract: A diaphragm for a loudspeaker including a plurality of masses, each mass being substantially the same radial distance from the centre of the diaphragm, the plurality of masses being divided into two arrays, each array including one or more individual masses, wherein, in use, at a selected frequency, the pair of arrays act to produce a dominant bending moment, and, the centre of the diaphragm lies substantially on the axis of the dominant bending moment, wherein, the dominant bending moment is the bending moment produced by the combination of masses which has the greatest magnitude, if they produce more than one bending moment.

Abstract: An electrostatic speaker system including at least one electrostatic speaker element having a pair of stators and a diaphragm therebetween, each of the stators and the diaphragm having an least one electrically conductive portion. The conductive portion of the diaphragm is patterned as a mesh, which may include gaps, and a conforming layer overlying the conducting portion of the diaphragm and disposed so as to cover gaps in the mesh. A speaker drive circuit provides soft clipping of the audio input signal so that the audio signal applied between the diaphragm and the stators does not exceed the maximum acceptable level that can be applied between the diaphragm and the stators of at least one speaker element.

Abstract: A yarn brake for a two-for-one twisting spindle has a brake element mounted in the region of a hollow axle of the spindle between an upper and a lower brake face, the braking force being predeterminable in a defined manner by means of the pretensioning of at least one spring element, which acts on an axially displaceably mounted upper piston, in which the upper brake face is integrated, and the yarn brake being pneumatically releasable to introduce a yarn. The upper piston (27) receiving the upper brake face (28) is configured in such a way and guided with play (S) within a housing (16) of the yarn brake (14) in such a way that it can move aside if necessary into a position (I), in which its center longitudinal axis (37) forms an angle (?) with the center longitudinal axis (38) of the housing (16).

Abstract: A yarn brake for a two-for-one twisting spindle has a brake element mounted in the region of a hollow axle of the spindle between an upper and a lower brake face, the braking force being predeterminable in a defined manner by means of the pretensioning of at least one spring element, which acts on an axially displaceably mounted upper piston, in which the upper brake face is integrated, and the yarn brake being pneumatically releasable to introduce a yarn. The upper piston (27) receiving the upper brake face (28) is configured in such a way and guided with play (S) within a housing (16) of the yarn brake (14) in such a way that it can move aside if necessary into a position (I), in which its center longitudinal axis (37) forms an angle (?) with the center longitudinal axis (38) of the housing (16).

Abstract: Two-for-one twisting spindle having a pneumatically actuated threading device, with a spindle shaft rotatable about a vertical axis partially configured as a hollow shaft with a lower feed bore extending coaxially to the rotational axis, and with an injector element opening into a thread guide channel of a thread guide ring temporarily connectable during threading to a compressed air source. Part of the compressed air feed to the injector element is formed by the feed bore. The compressed air feed comprises a connection element (27) with a curved air channel (26), which connects the feed bore (24) to the injector element (16). The connection element (27) is configured as a separate component and the air channel (26) is adapted to the flow requirements.

Abstract: Wind-on device for workstations of two-for-one twisters and ply twisters with a take-up bobbin, a drive shaft extending in the longitudinal direction of the machine, a friction roller which is driven by the drive shaft and causes the take-up bobbin to make a rotational movement, and a driven advance roller positioned upstream of the friction roller in the yarn run. According to the invention, in addition to the friction roller (14, 15), the advance roller (8, 9) is also driven by the drive shaft (27, 28) and in that the advance roller (8, 9) is mounted on a support element (23, 24) and can be pivoted together with the support element (23, 24) about a pivot axle selectively into an operating position or into a higher situated service position.

Abstract: An electrostatic speaker system including at least one electrostatic speaker element having a pair of stators and a diaphragm therebetween, each of the stators and the diaphragm having an least one electrically conductive portion. The conductive portion of the diaphragm is patterned as a mesh, which may include gaps, and a conforming layer overlying the conducting portion of the diaphragm and disposed so as to cover gaps in the mesh. A speaker drive circuit provides soft clipping of the audio input signal so that the audio signal applied between the diaphragm and the stators does not exceed the maximum acceptable level that can be applied between the diaphragm and the stators of at least one speaker element.

Abstract: A spindle bearing for a two-for-one twisting spindle, with a spindle rotor having a thread guide body and a spindle shaft rotatably mounted in a vertical arrangement by a lower bearing device in a bearing housing which can be fastened to a spindle bank and which has an upper bearing device for mounting a protective pot. A lubricant duct extends from the top through the thread guide body at least approximately parallel to the rotational axis of the spindle shaft and opens into the lower bearing device.

Abstract: Two-for-one twisting spindle having a pneumatically actuated threading device, with a spindle shaft rotatable about a vertical axis partially configured as a hollow shaft with a lower feed bore extending coaxially to the rotational axis, and with an injector element opening into a thread guide channel of a thread guide ring temporarily connectable during threading to a compressed air source. Part of the compressed air feed to the injector element is formed by the feed bore. The compressed air feed comprises a connection element (27) with a curved air channel (26), which connects the feed bore (24) to the injector element (16). The connection element (27) is configured as a separate component and the air channel (26) is adapted to the flow requirements.

Abstract: A spindle bearing for a two-for-one twisting spindle, with a spindle rotor having a thread guide body and a spindle shaft rotatablv mounted in a vertical arrangement by a lower bearing device in a bearing housing which can be fastened to a spindle bank and which has an upper bearing device for mounting a protective pot. A lubricant duct extends from the top through the thread guide body at least approximately parallel to the rotational axis of the spindle shaft and opens into the lower bearing device.

Abstract: A balloon control ring for a textile machine for limiting a circulating yarn balloon, wherein the balloon control ring comprising a metallic hollow cylinder with a wear-resistant surface, is characterised in that the hollow cylinder (2, 23, 37) is formed from a sheet metal strip, the hollow cylinder (2, 23, 37) is held by the end portions (3, 4; 14, 15; 38, 39) of the sheet metal strip, and an edge strip (8, 9; 10, 11; 55, 56) is folded round at the two edges of the hollow cylinder (2, 23, 37), with the sheet metal thickness of the sheet metal strip being at most 0.6 mm.

Abstract: Wind-on device for workstations of two-for-one twisters and ply twisters with a take-up bobbin, a drive shaft extending in the longitudinal direction of the machine, a friction roller which is driven by the drive shaft and causes the take-up bobbin to make a rotational movement, and a driven advance roller positioned upstream of the friction roller in the yarn run. According to the invention, in addition to the friction roller (14, 15), the advance roller (8, 9) is also driven by the drive shaft (27, 28) and in that the advance roller (8, 9) is mounted on a support element (23, 24) and can be pivoted together with the support element (23, 24) about a pivot axle selectively into an operating position or into a higher situated service position.

Abstract: Twisting flyer (1) comprising a rotary bush (6) and a hysteresis disc (7), arranged on a support sleeve (3), wherein the hysteresis disc (7) is arranged in the rotary bush (6) coaxially to the longitudinal axis of the support sleeve (3) and the rotary bush (6) has connecting elements (10) for the arrangement of the hysteresis disc (7). Openings (16) corresponding to the connecting elements (10) are arranged on the hysteresis disc (7), which openings can be brought into engagement in a positive manner with the connecting elements (10). According to the invention, the connecting elements are designed as snap-on elements (10).

Abstract: A balloon control ring for a textile machine for limiting a circulating yarn balloon, wherein the balloon control ring comprising a metallic hollow cylinder with a wear-resistant surface, is characterised in that the hollow cylinder (2, 23, 37) is formed from a sheet metal strip, the hollow cylinder (2, 23, 37) is held by the end portions (3, 4; 14, 15; 38, 39) of the sheet metal strip, and an edge strip (8, 9; 10, 11; 55, 56) is folded round at the two edges of the hollow cylinder (2, 23, 37), with the sheet metal thickness of the sheet metal strip being at most 0.6 mm.

Abstract: Bearing arrangement for a creel for holding a wind-on bobbin for winding on an elongate textile strand, wherein the bearing arrangement has a bushing, which surrounds a pin, wherein alternatively either the bushing or the pin is non-rotatably connected to the creel, and wherein the pin and bushing can be rotated relative to one another, so the creel is pivotable. According to the invention, the bushing (15, 15A) is fixed by means of a press ring (16, 16A) positioned with a press fit on the bushing (15, 15A).

Abstract: A two-for-one twisting spindle comprising a pneumatically actuated threading device, a spindle bolt (2) that is rotatable about the vertical rotary shaft (33) thereof, and an injector (12) which extends into a thread guiding channel (14). The injector (12) can be temporarily connected to a compressed air source (15). The thread (35) is conveyed through the thread guiding channel (14) by means of an air flow during the threading process. The compressed air supply unit is provided with an annular chamber (9) which is mounted upstream of the injector (12) and is formed by a rigid annular flange (8) that extends around the spindle bolt (2) and is joined thereto in a fixed manner.

Abstract: Disclosed is a two-for-one twisting spindle comprising a pneumatically actuated threading device, a spindle bolt (2) that is rotatable about the vertical rotary shaft (33) thereof, and an injector (12) which extends into a thread guiding channel (14). Said injector (12) can be temporarily connected to a compressed air source (15). The thread (35) is conveyed through the thread guiding channel (14) by means of an air flow during the threading process. The compressed air supply unit is provided with an annular chamber (9) which is mounted upstream of the injector (12) and is formed by a rigid annular flange (8) that extends around the spindle bolt (2) and is joined thereto in a fixed manner. The invention can be used in two-for-one twisters.

Abstract: A method for restoring the operation of a twist apparatus which imparts a prescribed twist to a yarn following a break in the yarn as it travels between a twist spindle of the twist apparatus and a wind-up package of the twist apparatus includes drawing off a twist yarn end from the wind-up package, securing it at a fixed securement point with a portion thereof having an intact twist turn, and cutting the drawn off twist yarn end. The twist yarn end from the wind-up package with the spin yarn end of the yarn from the twist spindle are then knotted or spliced to one another. Thereafter, the re-commencing of the operation of the wind-up package is effected with a delay relative to the re-commencing of the twist spindle operation such that the prescribed twist has propagated through the knotting or splicing location to the fixed securement point.

Abstract: A device for stopping a spindle of a textile machine driven by a drive belt has a roller for removing the drive belt from contact with the spindle whorl of the spindle. The roller is movable from a rest position, in which the roller is disengaged from the drive belt, into an engaged position in which the roller engages the drive belt and moves the drive belt away from the spindle whorl. A brake device for braking the spindle whorl is provided. A support member on which the roller rests in its rest position so as to be vibration-dampened is connected to the support of the textile machine.