摘要:
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 (α) with the center longitudinal axis (38) of the housing (16).
摘要:
In an open-end spinning machine, an empty tube is placed between the holder swinging arms of a bobbin holder of a spinning station at rest. An ancillary yarn is inserted and gripped at one end between one of the swinging arms and the edge of the tube. The opposite end of the ancillary yarn is adapted for spinning-in by cutting and shaping the opposite end which is in turn fed into a spinning unit. The ancillary yarn together with newly spun yarn is wound onto the tube through the spinning unit for making a yarn reserve. This yarn reserve is used by the open-end spinning machine for producing a cross-wound bobbin.
摘要:
The present invention provides an arrangement wherein a carriage is provided so that the carriage may travel along units of a two-for-one twister disposed, the carriage comprising a yarn exchanging mechanism for exchanging an empty yarn package supported on a spindle of each unit with a yarn package, a yarn end fining mechanism for drawing a yarn end from the yarn package, a threading mechanism for inserting the yarn end into an axial hole of the yarn package by an air flow, a doffing mechanism for removing a winding package for full bundles supported on a cradle arm of each unit and supplying a paper tube to the cradle arm, and a yarn engaging mechanism for engaging the yarn end of the yarn package with the paper tube when the cradle arm supports the paper tube.
摘要:
A two-for-one twisting machine, comprising twisting spindles each having a threading device arranged in the region of the spindle axis, through which a yarn is sucked in by the action of an injector and ejected by means of a compressed-air jet in upward direction through the space between the feed package pot and balloon limiter. A yarn catching ring placed on the upper annular gap of the space between the feed package pot and balloon limiter serves to catch and position the yarn, which ring has in its interior a closed annular channel with a cross section open toward the annular gap, and is connected, via a radially outward extending connecting end, with a source of underpressure. The underpressure permits the yarn to enter into the annular channel and advance to the connecting end, where it is finally positioned.
摘要:
A double twisting spindle is equipped with a pneumatically operated threading device. An injector nozzle is provided in the spindle rotor, an air stream through which nozzle sucks a thread into a hollow spindle axle and moves the thread through a thread channel in the storage plate. A compressed-air supply device is arranged below the spindle rotor for supplying compressed air to a central connecting channel provided in the spindle rotor and in communication with the injector nozzle. A common operating lever is provided which first operates a spindle brake and then opens a valve of the compressed-air supply device. The connecting channel has at its open lower end a funnel-shaped enlargement. The compressed-air supply device is stationary and has a blow nozzle which is fixedly arranged a small distance from the lower end of the spindle rotor and has an outlet opening which is coaxial with the funnel-shaped portion, the diameter of the outlet opening being smaller than the inlet diameter of the funnel-shaped portion.
摘要:
There is described a two-for-one spinning or twisting spindle in which thread drawn from a take-up package is threaded through from the bottom upwards by means of a compressed-air-operated threading arrangement so that it can be connected to thread, coming from a supply package, at the top end of a thread entry tube. In the arrangement shown, a thread storage disc of a two-for-one twisting spindle has therein a thread exit passage 8 the inner end of which opens into a short tube 10 which opens in turn into a hollow shaft 12 of the spindle, leaving an annular gap 11. In operation of the threading arrangement, compressed air is fed into a hollow shank 5 of the spindle from below and flows upwards through the annular gap 11. Because of this the short tube 10 acts as an injector nozzle which sucks the thread into the thread exit passage 8 from the side and transports it upwards through the hollow shaft 12 of the spindle. The thread can thus be knotted at the top end of the spindle which means that the spindle and take-up bobbin do not need to start up at different times as was previously necessary. In another embodiment, compressed air can be supplied to an injector arrangement through a passage in a floor of a protective pot.
摘要:
An apparatus for braking and positioning a spinning or twisting spindle with the spindle rotor in a specified position, having a spindle brake which engages with a rotary part, preferably a wharve, of the spindle, and, separate from said brake, positioning means comprising an additional braking surface which extends over part of the periphery of a rotary part, preferably a wharve, of said spindle and up to which an additional brake member is movable. The apparatus provides a more simply constructed braking and positioning means where it is permissible for the spindle to be stopped within a certain angular range about a prescribed central position. In the illustrated embodiment, a spindle brake proper comprises shoe means 7 engageable with an inside periphery of a skirt 5 of wharve 4, and there is provided positioning means comprising an additional braking surface 9 which preferably extends over an angle from 15.degree. to 30.degree. and which is engageable by an additional brake shoe 12. Movement of a toggle device 14, 15 downwards to a substantially straight position applied the spindle brake proper to stop the spindle rotor, and also causes, through fluid operated means, inward movement of shoe 12. Further movement of the toggle device 14, 15 to a downwardly-angled position releases the spindle brake proper, and the spindle rotor is held in a required position when surface 9 is opposite the inwardly-moved shoe 12.
摘要:
A yarn brake which may be utilized on a textile yarn processing machine, such as a two-for-one twister, for applying tension to a moving yarn and wherein a movable braking body is held in applied position against a braking surface and is separated therefrom during threading of the yarn through the yarn brake. An intercepting means is provided for receiving and holding the braking body, upon separation thereof from the braking surface during threading, in a position in which the braking body and braking surface remain substantially aligned for easily returning to braking engagement after the yarn threading.
摘要:
An apparatus is disclosed for threading one of several generally parallel strands through an operation through which the strands travel. The apparatus is designed to thread a broken strand using the movement of strands adjacent to this strand. The apparatus is also designed to reduce the downtime for the adjacent strands which are employed to pull and guide the broken strand through the rethreading operation. The apparatus is designed to allow for strand guide stabilization through the rethreading operation to allow the strands and guide to pass through the system easily and without placement errors in strand threading positioning. The apparatus includes a means for holding the broken strand, a means for releasably maintaining an adjacent guide strand within the apparatus and a means for releasably grasping the moving pull strand. The apparatus is designed to be threaded while the pull strand and guide strand remain in motion and to allow the guide strand to be removed from the apparatus without stopping this moving strand. This substantially reduces the downtime of adjacent strands in rethreading a broken strand.
摘要:
A yarn take-up and supply mechanism for use with textile machines processing yarn, such as during a threading-up operation of the machine, characterized by a construction for coiling a given length of yarn into a single-layer winding to produce a yarn storage and for releasing the stored yarn to the textile machine in a substantially tension-free condition, including the following. A selectively-rotatable elongate drum is operatively mounted at one end on a frame portion of the mechanism and defines an outwardly-extending overhanging free other end for winding of a given length of the yarn on the outside surface thereof. Selectively-operable clamping devices are mounted on and positioned generally at the free end of the drum for receiving a free end of the yarn and for clamping the free end of the yarn during winding of the yarn on the drum and for releasing the free end of the yarn after winding for supplying of the yarn to the textile machine from the surface of the drum by unwinding. A selectively-movable yarn guide device is mounted on the frame for slidably receiving the clamped yarn therethrough and for movement from the free end of the drum rearwardly along the drum for guiding the yarn onto the outside surface of the drum for winding thereof into a coiled single layer permitting subsequent unwinding in a substantially tension-free condition and for releasing the yarn and returning to its starting position after winding. Preferably, selectively-operable suction devices are operatively associated with the clamping devices for cooperating therewith when the clamping devices are open to draw the free end of yarn into the clamping devices for subsequent closing thereof to hold the free end of yarn therein. Also, preferably, selectively-operable compressed air devices are operatively associated with the clamping devices for cooperating therewith when the clamping devices are open for creating a positive compressed air stream to remove the free end of yarn from the clamping devices and for conveying the free end of yarn to a desired location in the textile machine.