Abstract:
One of the rails in a contact rail, suitably the inner rail (12) is provided over its length with a linearly increasing electric resistance that can be acquired as a measurable value at any point along the rail. A preferred embodiment has for this purpose a metallic conductor (11) helically wound around an isolating body (10). This inner rail (12) is held in an outer rail (13) with an upper U-shaped cross-section, and is separated therefrom by an isolating layer (14). The helically wound metallic conductor (11) has a considerably higher resistance compared to a massive rail, suitable for applying a measurement method based on the measuring bridge principle for locating a drop wire that has fallen on the contact rail in case of thread breakage. The distance between the fallen drop wire and one end of the rail can be determined from the relationship between the resistance of the whole inner rail (12) and the resistance of the section of inner rail extending from one end of the rail to the fallen drop wire, this resistance relationship being determined by the electric measuring bridge.
Abstract:
To provide a detachable corner joint on a heald frame a projection (2) arranged on the side stay (1) is used, clamped in the heald stave (4) shaped as a hollow profile of the heald frame by means of a locking screw (6). Between the side stay (1) and the projection (2) is arranged a vibration-dampening element (3) linked to the projection preferably by vulcanization. The vibration-dampening element (3) is composed of an elastomer and has a strip shape with the same width as the side stay (1). The side stay is thus linked with the heald stave (4) by the vibration-dampening element (3) at all corner joints and vibrations that are produced in particular when the machine turns at high speeds and which can lead to material breaks of the side stay are dampened.
Abstract:
A device for coupling a heald frame with a heald frame support (5) has a toggle lever-type lock (8) articulated by means of a swivelling axis (13) to the upper end of the heald frame support (5). The lock has a paired lever consisting of two parallel levers (14, 15) which swivels about the swivelling axis (13). An actuating lever (17) is pivotally articulated to the other end of the paired lever by means of an axis (16). In the actuating lever (17), which is designed as a hollow rod, a bolt (19) is pivotally arranged on the axis (16). The hollow rod (17) has elongated holes (18) through which the axis (16) extends and can therefore slide longitudinally relative to the bolt (19). The hollow rod (17) is forced slightly outwards by the force of an inbuilt, preloaded pressure spring (23), which abuts on a nut (21) screwed onto the end of the bolt (19) when a wedge-shaped pressure head (24) at the front end of the heald frame (17) engages in a catch recess (25) on a shaped piece (11) screwed onto the side support (3) when the lock (8) swivels into the locking position. The side support (3) and the heald frame support (5) fitted with the swivelling lock (8) are thereby pressed against each other. In the end position of the lock, an upper dead centre position is reached. This device, with its quick lock, can quickly couple or separate the heald frame and the heald frame support and replaces conventional coupling pieces.
Abstract:
The inner rail (1) axially movable in an outer rail (8) of U-shaped cross-section comprises a part (2) of insulating material and a metal rack (6) secured in a groove (5) of the upper edge of the insulating part (2). The outer rail (8) is provided with longitudinal holes (12). A synthetic material guide (11) which is removably secured in each hole presents a longitudinal slot (13) and, on the bottom thereof, an enlarged recess (14). The inner rail (1) is guided and held by its insulating part (2) in the slot (13) of the guide (11) and by its enlarged part (10) in the enlarged recess (14) so that the inner rail (1) is longitudinally movable in the outer rail (8) but can not be disengaged from the top. The part of the inner rail (1) which projects from the outer rail (8) upwardly has approximately the same length as the outer rail (8) in order to prevent dust or impurities from getting into the slot (9) of the outer rail (8).
Abstract:
In the weaving shaft with releasable corner connectors a projection (2) on the side support (1) engages in the hollow space (3) in the shaft rod (4) and is secured by a clamping screw (5). The shaft rod (4) is made, preferably as a welded structure, of stable longitudinal sections (6, 7) and very thin side-walls (9, 10). In the shaft rod made up of the longitudinal sections and side-walls there is an insert (11) consisting of blocks (12, 13) parallel to the longitudinal sections and reinforcing walls (14, 15) secured thereto which have a wall thickness 3 to 6 times greater than the thin side-walls (9, 10). The thin side-walls of the shaft rod are firmly secured to the reinforcing walls (14, 15) of the insert (11), preferably by welding, so that the forces to be transferred during the operation of the loom from the side supports to the shaft rod are conducted to the thin shaft rod side-walls (9, 10) as tensile forces. The reinforcing walls and the thin side-walls of the shaft rod are subject only to tension and, despite their thin gauge, said side-walls cannot bulge. The projection (2) on the side support (1) is clamped only between the blocks (12, 13) of the insert (11).
Abstract:
The supporting bar consists of a small strip (1) formed by a hollow body and a connecting part (2) on its narrow side to hold the heddle bar (3) placed at its extremity. These parts comprising the supporting bar are made from flat pieces of sheet steel (4-14) welded together. Relatively thin pieces of sheet steel (5, 6, 9, 10) on the broad longitudinal sides are welded to pieces of sheet steel (4, 7, 8, 11, 12) of appreciably greater thickness on the narrow longitudinal sides. The use of laser welding makes it possible to manufacture precisely and in large quantities a supporting bar of low weight and high flexural strength. Its resistance to alternating bending stresses is notably superior to that of a supporting bar manufactured from a lightweight metal section.