Abstract: An object-to-be-soldered (92) is accommodated in a sealable chamber (17). An internal pressure (P) of the chamber (17) is raised to a normal pressure (Po) or higher by feeding a reducing gas to the chamber (17). A soldering of a semiconductor element (12) with respect to a circuit board (11) is carried out in the pressurized state. The pressurized state indicating a set pressure (P1) (for example, 0.13 MPa) is maintained in a solder melting period (t3 to t7) until the molten solder (33) is solidified (t7) after the solder (33) starts melting (t3). Accordingly, voids are inhibited from being generated in the solder after being solidified.

Abstract: A weft inserting device using a profiled reed for an air jet loom is equipped with a plurality of reed pieces each having a C-shaped guide notch. The line of guide notches forms a weft passage where weft injected from a main nozzle flies. Each guide notch has a upper wall parallel to the floor surface on which the device is placed, a deep wall perpendicular to this surface, a lower wall which gradually becomes wider toward an opening, an upper connecting portion which connects the upper wall to the deep wall, and a lower connecting portion which connects the deep wall to the lower wall. The radius of curvature of the upper connecting portion is set equal to or smaller than 1 mm, and the radius of curvature of the lower connecting portion is set greater than the radius of curvature of the upper connecting portion.

Abstract: A pile forming apparatus allowing use of a driving motor of small capacity for effectuating terry motion while assuring high quality for manufactured pile fabric includes a ball screw constituting an output shaft of the driving motor with which driven nuts threadedly engage. One driven nut is operatively connected to a first arm of a displacement-direction change-over lever by a link. Displacement of the driven nuts caused by rotation of the ball screw is transmitted to an expansion bar via the link, the change-over lever, a first rod, an intermediate lever, a second rod and a supporting lever to displace the cloth fell of the pile woven fabric.

Abstract: A weft insertion device for a jet loom prevents weft the distal or leading end of the weft from being ejected from the weft passage before reaching the exit end of the passage in the reed, while improving the flying speed of a weft. The weft insertion device has a reed provided with a plurality of reed pieces (3A, 3B, 9A, 9B) having guide openings (4, 5, 14, 15) recessed in the front faces thereof. The wall portion of each guide opening of the reed has at least one wall surface (4b, 5b, 14e, 14g, 15e) provided to guide air flowing through a weft passage (S). The inclination angle of the wall surfaces (4b, 14e, 14g), provided at the wall portions of the guide openings of those reed pieces (3A, 9A) which are arranged in a first section (L1), located closer to a main nozzle, suppresses air leakage toward the opening side of the weft passage.

Abstract: A take-up rate and a let-off rate in warp feed on a loom are controlled while a displacement (.DELTA.L) of a cloth fell position C is taken into account. The system comprises a cloth fell position compensation circuit (2, 16, 21) which outputs a cloth fell compensation signal (.DELTA..omega..sub.c) to compenate a displacement (.DELTA.L) of the cloth fell position (C) when a weaving condition such as a target weft density (D*), a target warp tension (T*) or the kinds of weft and warp yarns is changed. The cloth fell compensation signal is added to a basic warp feed rate (.omega..sub.f) obtained from D*, so that the displacement motion of the cloth fell is completed in a shorter time. According to this compensation, a weft density of a resultant fabric rapidly coincides with the target weft density.

Abstract: A method for preparing weft supply to be picked upon starting the operation of a weaving loom, the weaving loom comprising a main motor for driving the weaving loom, a crank shaft driven by the main motor, a drum for measuring weft to be picked by a main air jet nozzle, a driving system of the weft measuring drum, and an auxiliary motor for driving the weft measuring drum. The method comprises releasing the normal connection between the driving system of the weft measuring drum and the main motor for driving the weaving loom so as to enable an auxiliary motor to drive the driving system of the weft measuring drum. The weft measuring drum is then positioned by the auxiliary motor at a position suitable for being threaded with the weft. The weft is then threaded onto the weft measuring drum, whereupon the weft measuring drum is driven by the auxiliary motor so as to store a predetermined amount of weft thereon.

Abstract: An apparatus for measuring the weft yarn length for a loom constructed in accordance with the present invention comprises at least two weft yarn supply units each having a weft yarn length measurement element presenting a yarn winding surface, an equal number of electric motors each adapted for winding weft yarn around said yarn winding surface of the measurement element, and weft yarn latching mechanisms for controlling the amount of the weft yarn wound on each winding surface and the transfer of the wound yarn in the weft inserting direction. Each of the rotational speeds of the respective motors and the operation of the respective weft yarn latching mechanisms may be controlled by a control unit in accordance with a preset weft yarn selection program.Each yarn length measurement element may be associated with a sensor for sensing the number of times the weft yarn is wound on the element.

Abstract: In the weft inserting device of the invention, a pair of main nozzles are supported by a change lever and the motion of a cam lever operatively linked with movable loom parts for reciprocation thereby is transmitted to said change lever. The timing of motion transmission and interruption is controlled by a timing control unit. According to a preferred embodiment, the control unit is a microcomputer and the timing setting can be changed by changing the weft yarn selection program stored in the microcomputer.

Abstract: A spinning unit for an open end spinning machine is disclosed. The unit includes a rotor having a short cylindrical portion defining a central aperture, a frustoconical portion connected at one end to and converging toward the cylindrical portion, and a portion connected to the other end of the frustoconical portion with air discharge openings. The unit further includes a casing having a first portion, and a second portion connected to the first portion of the casing and surrounding the portion of the rotor connected to the other end of the frustoconical portion to define an annular chamber into which air is discharged through the air discharge openings during rotation of the rotor.

Abstract: An open end spinning machine includes a plurality of spinning units, in each of which a sliver is opened by a carding roller and transported, in the form of individually opened fibers, into a spinning rotor through a fiber supply channel provided in a housing for the carding roller. The supply channel has a mouth opening towards the carding roller with a fiber separating edge, which is greatly subject to wear during operation of the spinning unit. A portion of the carding roller housing, which defines at least the fiber separating edge, is detachable from another portion of the housing and is urged in a predetermined direction by a biassing spring so that any undesirable clearance, which would be produced between the portions of the housing by structurally separating them from each other, can substantially removed.

Abstract: This invention provides a rotor sealing device used on an open-end spinning apparatus having a spinning rotor which forms therein air-discharge apertures, the opening in said spinning rotor being openably closed by a body member which has a fibers delivery aperture formed therein; said rotor sealing device being characterized in that a sealing member is inserted into the space located between said rotor opening and said body member positioned in opposite relation thereto. This device, though being of such a simple construction, is capable of improving the effect of rotor inside sealing over devices heretofore.

Abstract: An open-end spinning frame comprises a fiber feeding mechanism, constructed with a feed foller and a presser urged towards the feed roller, a combing roller having a metallic wire wound therearound, a rotor for spinning the fibers delivered from the combing roller, and a pair of flat side plates. The feeding mechanism is provided with a passage for flowing air current, which passage is formed by chamfering the side of the presser, by shortening the width of the feed roller or by forming only one projection at the front end of the presser. Through the air current flowing passage, one or more flow-in air currents flow so that the accumulation of fibers does not occur easily.

Abstract: A device for preventing a spindle of an open-end spinning frame, which device comprises a rotatable spindle having a rotor attached at one end thereof and a shaft, formed at the other end thereof, to be pressed by a running belt, a bearing casing for rotatably supporting the spindle, a holder for holding the bearing casing via a pair of resiliently yieldable members. At least one of the resiliently yieldable members are detachably mounted on a sleeve detachably secured to the bearing casing. A labyrinth seal is formed between the rotor and the sleeve.

Abstract: A dust removing mechanism is applied to each unit of an open-end spinning machine. In each spinning unit provided with an opening roller and a spinning rotor for creating a yarn from fibers supplied from the opening roller, a casing partly surrounds the opening roller and a dust removing opening is formed in the casing. In such mechanism, a dust removing zone is formed so that it communicates with the dust removing opening and the dust removing zone is divided into a dust separating zone and a dust discharging zone. An air-takein opening is provided so as to create an auxiliary air stream, by which the separation of dust from the useful fibers can be effectively carried out.

Abstract: An open end spinning machine includes a row of spinning rotors each connected to spindles rotatably supported in their predetermined axial position by associated twin-disk mechanisms and driven by a belt moving across the spindles. When the spindle is subjected to an external axial force in either of opposite axial directions due to disturbance of a right-angled relationship between the belt and the spindle, an arrangement according to the invention causes the spindle to be subjected to a force, the direction of which is directly opposite to and the strength of which is in proportion to that external axial force due to the disturbance of the right-angled relationship, whereby the spindle is maintained in the predetermined axial position.

Abstract: Disclosed is an open-end spinning apparatus provided with a fiber-bundle supply mechanism disposed to a casing and a combing roller disposed in the casing, so as to separate the supplied bundle of fibers into individual fibers, and a spinning rotor for forming a yarn from said individual fibers; a fiber carrying passage is formed in the casing at a position between the fiber-bundle supply mechanism and the spinning rotor, the fiber carrying passage being provided with a combing section where an action of the combing roller is imparted to the bundle of fibers delivered from the fiber-bundle supply mechanism so that the fibers of the fiber-bundle are separated from each other from; a pneumatic or mechanical means is provided for positively introducing the above-mentioned individual fibers to a part of the cylindrical surface of the combing roller; so that, consequently, all fibers contained in the bundle of fibers fed from the fiber-bundle supply mechanism receive effective combing action of the combing roller

Abstract: In an open-end spinning apparatus provided with a fiber feed mechanism, a combing roller for separating a bundle of fibers supplied from the feed mechanism into individual fibers, a spinning rotor for receiving individual fibers delivered from the combing roller and for forming a ring shaped bundle of fibers on a fiber collecting zone formed at an inside wall position having a maximum lateral diameter with respect to a rotational axis thereof, and a yarn guide means for introducing a yarn formed in the spinning rotor toward a takeup mechanism disposed at a position outside the spinning rotor, a plurality of air streams are directly blown toward the fiber collecting zone by means of air stream creating means so that the ring shaped bundle of fibers deposited on the fiber collecting surface is urged toward the inside wall of the rotor at this collecting zone by the action of the air stream together with the centrifugal force of the fibers which is created by the rotation of the spinning rotor.