Abstract: The heat exchanger is constructed with an expansion zone between the two groups of support plates for the helical tubes. In addition, the upper group of support plates is connected at the upper ends to a cross. A lower group of support plates is connected to a lower part of a displacement member which slides in an upper part of the displacement member. Links are also provided to secure the lower support plates to the bottom of the pressure vessel. The inlet and outlet connections for the secondary medium are provided at opposite ends of the coiled tubes.
Abstract: The picking apparatus operates to pick a weft yarn into a shed with a predetermined excess length. A weft stretching nozzle receives the excess length at the forward end of the weft thread while stretching the weft yarn from the catching side of the shed. After termination of picking and during an initial phase of the beating-up movement of the reed, the weft yarn is pulled back on the picking side by the amount of the excess length. The stretching effect on the weft yarn is effective and uniform and obtains a better fabric during weaving.
Abstract: The weaving machine has a weaving rotor with beating-up lamellae each of which has a beating-up edge perpendicular to the beating-up line during beating-up of the weft yarn. In addition, a rotatable shell is provided to operate after each beating up of a weft yarn in order to draw the cloth in the take-off direction at at least the peripheral velocity of the beating-up lamellae until these lamellae pass out of engagement with the cloth. The shell can be oscillated in synchronism with the beating-up operation via a cam disc coaxial with the rotor and a linkage secured to and end of the rotatable shell 9. The arrangement prevents the cloth from being displaced from the cloth plane by the beating-up lamellae.
Abstract: The weaving rotor has a row of radial bores disposed on a generatrix coincident with the relay nozzles of a picking comb. A stationary control tube which is supplied with compressed air is disposed within the rotor and has a row of slots which register with the rotor bores and which are disposed on a helix offset from the generatrix of the rotor bores in the direction of rotation. During rotation of the rotor, air is sequentially directed to the relay nozzles.The control tube also has a second row of bores to permit the blowing of air through all of the relay nozzles simultaneously.
Abstract: At the weaving rotor there are alternatingly arranged with respect to the direction of rotation thereof first lamellae combs formed by beat-up lamellae for the weft threads and second lamellae combs formed by guide lamellae for the warp threads and including shed-retaining elements for the upper shed position of the wrap threads. The shed-retaining elements for the lower shed position are arranged within each pair of lamellae combs formed by a first lamellae comb and a second lamellae comb at the intersection point of the two groups of warp threads which assume the upper and the lower shed positions, respectively, and are formed by an element extending essentially parallel to the lamellae combs. In the lower shed the warp threads are thus always located in a common plane and the elements forming the shed-retaining elements for the lower shed position can be installed and disassembled without interference with the lamellae combs.
Abstract: At the weaving rotor there are arranged in alternating fashion in respect of a predetermined direction of rotation thereof beat-up combs for the weft threads and guide combs containing shed retaining elements for the upper shed position of the warp threads. In the running direction of the warp threads control means are provided in front of the weaving rotor for laterally deflecting and selectively allocating each warp thread to a shed retaining element. Each beat-up comb and each guide comb alternatingly includes first and second beat-up lamellae and first and second guide lamellae, respectively. Compared to the first beat-up and guide lamellae, the second beat-up lamellae and second guide lamellae each contain a recess at the location of the lamellae combs which first immerse into the warp threads during rotational movement of the weaving rotor.
Abstract: The present invention relates to a weft insertion device for use on a band-gripper weaving machine. The device has a driven, rotationally oscillating band wheel having a flexible insertion band including a gripper head. The band executes an oscillating movement transversely to the warp shed as the band unwinds from the winds onto the circumference of the band wheel. The circumference of the band wheel is smaller than the maximum excursion of the gripper head. The insertion band is wound around the circumference of the band wheel to the extent of more than 360.degree. when the gripper head is in the position in which the head is fully and maximally withdrawn from the warp shed. In this way, the diameter of the band wheel can be kept small. This small diameter permits operation at high rotational speeds and also renders the band wheel less expensive. This is particularly advantageous when the machine is wide.
Abstract: The present invention relates to a serial shed weaving machine with a weaving rotor. Guide channels for weft threads transported by a flowing fluid are mounted on the weaving rotor. The guide channels are formed from a plurality of elongated, tube-like channel elements having a closable weft thread exit gap. The channel elements have complementary end configurations such that they can be moved together to form a closed guide channel. The channel elements are movable back and forth in the weft insertion direction. When the channels are moved in a first direction, the closed guide channel is opened and gaps are formed between the channel elements and each channel element is moved out of its associated part of the warp shed. When the channel elements are moved in a second direction, each channel element is moved back into its associated part of the warp shed and the guide channel is closed. The total excursion of each channel element in each direction is at least as great as the length of the element.
Abstract: The reed dents for the reed of a jet weaving machine have recesses on their forward edges for guiding and beating-up the weft thread, and they are given a bend along their longitudinal extent so as to incline toward the fell of the fabric. The inclined upper half of the reed inclines forwardly and, when the batten is in its rearmost position, the upper reed cap is closer to the fell of the cloth than is the case when reed dents of known configuration are employed. Consequently, the harnesses can be positioned closer to the fell, with the result that the harness stroke is reduced and it becomes feasible to increase the r.p.m. of the weaving machine.
Abstract: An apparatus for guiding a weft or filling thread in the shed of a loom, the weft thread being driven by a flowing fluid medium, comprises two lamellae combs which can dip into and out of the warp threads. The lamellae or equivalent plate-like guide elements of the lamellae combs each possess a throughpass opening for guiding the weft thread and a thread exit or outlet opening. When the lamellae are in a position completely immersed in the shed they are interleaved or shoved into one another and form a guide channel for the weft threads, this guide channel being coherent or continuous in the weft insertion direction. Hence, the thread exit or outlet openings are sealed, so that the guide channel also is continuously closed in radial direction.
Abstract: The device for the storing of filamentary material contains a thread storage and a feed nozzle associated with it, the thread storage having a thread carrier which rotates past the feed nozzle and the feed nozzle being arranged fixed in position and rigid; and the depositing of the thread (S.sub.1, S.sub.2, S.sub.3) on the thread carrier takes place in the form of thread packages (P.sub.1, P.sub.2, P.sub.3) which consist of partially superimposed turns so that the length of the thread package (P.sub.1, P.sub.2, P.sub.3) and thus of the entire storage can be kept small, so that the storage is particularly suitable for looms, especially when using so-called mixers. The thread carrier is preferably covered by a small plate at the point of the formation of the thread packages, and the thread packages are deposited in the space between the thread carrier and the plate.
Abstract: A filling-thread monitoring device for jet looms in which a filling thread is guided during its introduction into the shed of a loom in a first guide channel which is formed by spaced members and is partially open on its side, contains a first filling thread stop motion means for the giving off of a signal when the filling thread introduced does not reach its normal length and a second filling thread stop motion means spaced from the first stop motion means in order to give off a signal when the filling thread introduced exceeds its normal length by a predetermined amount. Between the two filling thread stop motion means, a guide member is arranged which extends over the space which is free of warp threads and has a second guide channel which lies in the extension of the first guide channel and is closed in the filling direction.
Abstract: An air supply system for a pneumatic loom contains a primary or main nozzle and a number of auxiliary nozzles. A pressurized or compressed air container or reservoir is connected by means of a primary or main control valve with a pressure line or conduit. The auxiliary nozzles are connected with the compressed air container. The primary nozzle is connected by a line with the primary control valve. This line extends, in the direction of the primary nozzle, through a pressure regulation valve and a control valve. Directly forwardly of the control valve there is arranged a compressed air storage. Consequently, there is obtained the beneficial result that the pressure in the primary nozzle, each time that the loom is placed into operation, always reaches its operating value as rapidly as possible. Thus, it is possible to dispense with the need to increase such pressure and the weft thread or filling is therefore less markedly loaded.
Abstract: There is disclosed a thread-feed device having a stationary winder drum storing a supply of thread which can be wound-on by means of a rotatable winder arm and removed overhead from the winder drum, and having a first monitoring device which automatically controls the rotary movement of the winder arm as a function of the length of the supply of thread formed. Within the region of the withdrawal end of the winder drum there is arranged a second monitoring device which gives off a first signal to a control unit upon each pass of the thread through its monitoring region during the withdrawal of the thread. The control unit counts the first signals and, as soon as their number reaches a predetermined adjustable value which corresponds to the desired required length of thread, there is given off a second signal by which a thread gripper is actuated so that the thread-feed device delivers precisely measured lengths of thread, such as required for instance for the filling insertion on jet looms.
Abstract: A gripper head for looms working with removal of the filling thread from stationary bobbins comprises a clamping gap formed by a fixed stop and a movable clamping tongue. The clamping gap serves to fixedly clamp a filling thread which passes through the clamping gap essentially perpendicular to the central plane of the warp threads. The clamping tongue is structured to be displaceable in the lengthwise direction of the gripper head for opening and closing the clamping gap. Due to this actuation of the clamping tongue, by displacement thereof in horizontal direction, the clamping tongue is insensitive to flutter movements of the gripper head caused by vertical oscillations and there is ensured for more positive clamping of the filling thread.
Abstract: An apparatus for coupling a harness-motion to a harness frame, the coupling end of the harness-motion being a harness-motion hook having a jaw capable of receiving a correspondingly shaped counterpiece secured to the harness frame, the harness-motion hook provided with a supporting surface adjoining the jaw for the supporting of the counterpiece before the coupling of the harness-motion hook and the counterpiece.
Abstract: At an insertion element of a gripper loom possessing a gripper and a flexible insertion band or tape which drives such gripper, there is arranged a reinforcement element at the region of the insertion band which merges with the gripper, this reinforcement element being connected by screws or the like with the insertion band. The gripper is connected on the one hand with the reinforcement element and, on the other hand, with the insertion band likewise by screws. The gripper consists of a material having a lower specific weight or density in relation to steel and is provided at the region of its clamp member which fixedly clamps the filling thread with an insert or insert member formed of a wear-resistant material. Due to this design there are realized high stability of the insertion element, low fabrication and assembly cost, and a possibility of increasing the rotational speed of the loom owing to reduced mass of the gripper.
Abstract: A reed for a jet loom, in which the filling yarns are introduced into the shed by a gaseous fluid expelled from nozzles arranged spaced apart over the loom width and which periodically enter the shed, which reed has first reed blades having a profiling on their one edge and together form a guide channel for the filling yarn; and in the region of the projection of the nozzles onto the reed there are provided second reed blades the shape of which at their one edge is so selected that the guide channel is open on the wall thereof adjacent the nozzles.
Abstract: The production of pile fabrics in which the stroke of the batten of a loom during operation is periodically decreased from the value corresponding to a full stroke of the batten by a value for partial strokes which is referred to as the pre-beating distance.
Abstract: A multiple longitudinal traversing shed weaving apparatus comprises a weaving rotor having beat-up or beating elements for the inserted weft threads and shed-retaining elements which retain the warp threads, throughout a predetermined path, in their upper shed position or lower shed position. Each intermediate space between neighboring beat-up elements has operatively associated therewith a respective shed-retaining element which determines the upper shed position or lower shed position. Control means are arranged forwardly of the weaving rotor, viewed in the direction of travel of the warp threads, and serve for the lateral deflection and selective allocation of the warp threads at a shed-retaining element which determines the upper shed position or lower shed position. The control means possesses stroke adjusting elements in the weft direction which are constituted by rods or bars extending in the weft direction.