摘要:
In a roving winding apparatus applied to a roving frame provided with a plurality of draft parts and corresponding bobbin wheels, a bobbin shaft for driving the bobbin wheel, a bobbin rail on which the bobbin shaft is rotatably horizontally mounted along the longitudinal direction thereof, a lifting motion mechanism for lifting the bobbin rail, and a main motor for driving the draft parts at a predetermined rotational speed, wherein the bobbin shaft is driven under a controlled condition created by a servomotor to follow a digital signal output from the rotation angle detecting device applied to the common bottom front roller of the draft parts, in an adjusted optimal condition under the control of a computer system, incorporated with the lifting motion of the bobbin rail.
摘要:
The present invention is directed to a method of maintaining a predetermined quality of a carded sliver, wherein there is a predetermined overproduction from a card and/or a drawframe relative to a spinning machine. The method includes temporarily decreasing production to temporarily compensate for the overproductions. The sliver which is produced during the decrease in production may be delivered to a separate can.
摘要:
The invention provides for the spinning units of a multi-position rotor spinning machine to be driven by a common AC drive motor powered by a static inverter enabling the power supply frequency to the AC motor to be controlled for controlling the rate of acceleration and the operating speed and the rate of deceleration of the AC drive motor. This facilitates a method of mass stopping.
摘要:
In order to be able to start-spin on the individual spinning units of an open-end spinning machine under conditions which deviate from the operating conditions and which are, in particular, significantly more favourable for start-spinning, the end of the thread is placed on a ring of fibres located in the spinning rotor at a spinning rotor speed which is reduced relative to the operating speed. At the same time, the sliver feed is reduced in such a manner that the amount of sliver feed corresponds to the reduced speed of the spinning rotor. This reduced sliver speed is produced by a mobile start-spinning unit which is equipped with means which intervene in the drive and/or control of the drive or control means causing feed of the sliver.
摘要:
In a flyer frame, winding of rovings is performed by utilizing the difference in rotation rate between a flyer and a bobbin. Therefore, it is necessary to reduce the rotation rate differences with increase of the bobbin diameter. The bobbin is driven through one of a pair of cone drums around which a belt is stretched, and the rotation rate of the bobbin can be adjusted by changing the belt position along the length of the cone. A device for compensating changes in roving winding tension comprises a link mechanism having at least two elements and disposed to connect a belt shift for moving a belt with a moving member capable of intermittent movement at a constant pitch. The link mechanism is moved by the moving member along a fixed guide member having a cam surface while part thereof is engaging the cam surface of the fixed guide member. By the cooperative action of the cam surface and link mechanism, the constant-pitch intermittent movement of the moving member is converted to a desired movement of the belt, thus compensating the changes of the roving tension.
摘要:
Method and apparatus for driving open-end spinning frame by a first electric source which actuates the spinning frame at a predetermined higher speed for carrying out the normal spinning operation and by a second electric source which actuates a spinning unit of yarn break at a predetermined lower speed during the yarn piecing operation. These electric sources are variable frequency electric sources for driving at least each individual variable speed motor which is directly connected to a spinning rotor of each spinning unit at predetermined variable speed.
摘要:
A driving arrangement for a drawtwisting machine for drawtwisting continuous filament yarn, comprising a draw zone including draw rolls for drawing the yarn, a takeup and twisting zone including a rotary spindle and a ring and traveler by means of which the drawn yarn is wound onto a package carried by the spindle, a DC electric draw roll motor for driving the draw rolls, a DC electric spindle motor for driving the spindle, common armature voltage control means to control the armature voltages applied to the motors to provide for a variation of the armature voltages from values giving rise to crawl speeds for the two motors for starting up purposes to values giving rise to normal running speeds for the two motors, and yield voltage control means to control the field voltages to be applied to the motors and including automatic means for adjusting the field voltage of the spindle motor thereby to control the speed thereof independently of the speed of the draw roll motor.
摘要:
A spinning apparatus with continuous adjustment of a yarn accumulation system includes at least one spinning head including a spinning device including a spinning chamber for yarn production, a reel on which yarn produced by the spinning device is wound, the reel being rotatably influenced by a yarn guide shaped to impart a rotation movement of the reel for winding the yarn and a traversing movement of the yarn winding on the reel, an accumulation device arranged between the spinning device and the reel and shaped to create a reservoir of yarn not wound on the reel, a joining device including joining means to join together a first yarn end associated with the spinning device and a second yarn end associated with the reel, and a processing and control unit programmed to control the yarn guide to adjust accordingly the amount of yarn accumulated in the accumulation device.