JPH02289127A - Ring spinning frame and method for actuating it - Google Patents

Abstract

PURPOSE: To facilitate a winding-up operation, a piecing operation and a doffing operation of yarn by installing a control means for controlling a switchable reluctance spindle-driving motor allowing the speed to be changed during the operation. CONSTITUTION: A spindle 10 is connected to a motor shaft 14 of a switchable reluctance driving motor 18. A controller 16 controls the speed and acceleration of the motor 18. The controller 16 can control the torque imparted not only when the motor 18 stopping but also when the motor 18 rotating.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a spindle drive device in a loom in the form of a ring spinning frame, a ring doubler-1, and a non-twisting machine, and these devices are collectively referred to herein as It is called a ring spinning machine.

Conventional technology AC for individually driving the spindles of a ring spinning machine
The motor was explored. Although this structure can generate the torque necessary to wind up the yarn onto the package former mounted on the spindle, the motor is easily controlled, especially at the start and end of the spinning operation. It is not possible to do so. Furthermore, AC motors are not able to generate any torque large enough while in stationary mode.

Such an AC motor is described, for example, in British Patent Specification No. 8.
59159 f (Prince Smith and Stealth),
No. 2022635 (Shaster).

OBJECTS OF THE INVENTION It is an object of the present invention to provide a device for improving yarn winding, splicing and dotting operations.

SUMMARY OF THE INVENTION According to one concept of the invention, a spindle having a plurality of spindle positions, each of which can be fitted with a package former for winding up yarn, and a spindle for driving said spindle. a switching reluctance type drive motor, each ring spinning assembly consisting of a ring and a traveler, and a feed roller for feeding yarn to said assembly, varying the speed during operation; A ring spinning machine (as defined herein) is provided, comprising control means for controlling said motor to cause the ring spinning machine to rotate.

A switched reluctance drive motor of the type disclosed in GB 1597486 can be controlled to operate in the desired manner during yarn splicing and winding operations, and compared to previous operations. This gives an even better automatic dotting operation. Although such a motor is disclosed in the above-mentioned GB 2022635, the inventors believe that it can only be used as a pacemaker for a high capacity three phase AC motor driving a spindle.

According to another concept of the invention, there is provided a spindle ξ on which a package former for winding up the yarn can be mounted, a switched magnetoresistive drive motor for driving said spindle, and a ring machine consisting of a ring and a traveler. A ring spinning machine (as defined herein) comprising a spinning assembly, a feed roller for feeding yarn to said assembly, and control means for controlling said motor. 2. A method for controlling the feed rate of yarn fed from said feed roller to ensure that a predetermined number of turns per unit length of yarn is applied to the yarn while the motor is accelerated. and a step of controlling the acceleration of the motor from a stopped state, and a step of controlling the deceleration of the supply speed of the yarn from the supply roller until the spindle stops. A method of operating a spinning frame is provided.

A third concept of the invention is a method for dotting a ring spinning machine (as defined herein) having a spindle with an individual switched reluctance drive motor, the method comprising: removing a loaded package former from the spindle; This provides a constant holding torque while the spindle is stationary to prevent the spindle from rotating while cutting the yarn on its package former from the yarn thread fed by the feed roller. To provide a dotting method in which individual drive motors are controlled in a similar manner.

A fourth concept of the invention is a method for splicing at the spindle position of a ring spinning machine (as defined herein) driven by individually switched reluctance drive motors, comprising:
stopping the drive motor to restrain the spindle; reversing the motor with a controlled torque to unwind a length of yarn from the spindle; accelerating the drive motor; and and achieving a splicing operation by splicing the length to a yarn at a feed roller.

The following description is given on the basis of non-limiting examples with reference to the accompanying drawings, in which: FIG.

Referring to the detailed illustrative drawings of the preferred embodiment, in this embodiment the spindle 10 includes an annular member 12 carrying a yarn cutter 13.
and is connected to the motor shaft 14 of a switched electroresistive drive motor 18, for example of the type of British Patent Specification No. 1,597,486. This switching electromagnetic resistance drive motor 1
8 is controlled by a control device incorporating two control devices 16 and 50, which will be described later.

The yarn, in this embodiment yarn 22 fed in an arc from a pair of feed rollers 24, is a traveler that is free to rotate on a ring 30 mounted on a horizontal ring rail 32.
28 towards a package former 20 mounted on a spindle. Vertical movement of the ring rail 32 carrying the ring 30, as indicated by the double-headed arrow 26, is controlled in the conventional manner. The controller 16 is a local controller for the individual spindle positions shown and is capable of determining the speed and acceleration of the switched reluctance drive motor 18 and when the motor is at rest as well as when the motor is rotating. The torque applied can be controlled in any case.

On the other hand, the control device 50 is an overall control device that covers several spindle positions, for example all spindle positions located on one side of a double-sided machine, or all of a multi-position machine. , a local controller at the individual spindle position is commanded to ensure the synchronization of the various spindle positions under its control, and the spindle position of the entire machine is controlled by a controlled acceleration based on starting or, for example, dotting. It is actuated in such a way as to ensure that the required simultaneous operations, such as controlled deceleration, are carried out based on the stop that precedes the actuation.

Local controller 16 and switched electromagnetic resistance drive motor 1
This control device is connected to the control line between motor 1 and motor 8.
Feedback from the motor to the local controller is included in order to recognize the state of 8 and to confirm that the commanded motor action has actually taken place.

For example, the local controller 16 can switch between two or more different torque values and command the electroresistive drive motor 18 as needed when dotting is performed manually or automatically when stationary. A large holding torque is applied by the motor when
Otherwise, a small holding torque is applied so that the motor remains stationary in the absence of external influences, and external mechanical It is made to be able to rotate under the influence and under control.

By limiting the time during which the large holding torque applied by the motor 18 is applied, the amount of heat generated by the motor that would otherwise occur in the case of a large holding torque can be minimized.

Large holding torques are not required for manual dotting. The control lines between the overall controller 50 and the various local controllers 16 associated with it include information on the status of the individual drive motors to enable confirmation of the status of the drive motors under control of the overall controller. Contains feedback.

The advantage of having both a local controller and an overall controller is that
The operation of each spindle position is under the control of the overall control device, but for example, when splicing after cutting, it is possible to separate the control function from the overall control device and locally control that particular spindle position. This can be done similarly for all other normally functioning spindle position operations after cutting and during splicing at that particular spindle position. It is.

In steady-state operation of the apparatus, the spindle 10 is set to rotate at a preset speed by the overall controller 50, and the yarn 22 is fed uniformly through the traveler 28 and onto the package former 20 by the feed roller 24. Guided by speed.

Once a sufficient amount of yarn has been wound onto the package former 20, the ring 30 carrying the traveler 28 is moved to the lowest position by lowering the ring rail 32. In this embodiment, the fed yarn is then transferred from the package former onto the annular member 12 on the spindle, and this action is accomplished by wrapping the yarn at least several times over the annular member to retain the yarn. controlled to ensure that this is done. In doing so, the yarn is passed between two successive radially projecting blades of yarn cutter 13.

The motor 18 is then controlled to a complete stop and held in the stopped position by the action of a holding torque set by the local controller 16 commanded by the global controller 50. Meanwhile, the dotting unit (not shown)
is lowered onto the loaded package former 20 and lifts the package former 20 from the spindle 10 so that the yarn between the package former and the annular member is cut by one blade of the yarn cutter 13. . The motor torque is controlled to a high level (controlled by local controller 16) during this lifting operation;
Preferably, the yarn tension is applied as necessary to effect the yarn break. This lifting, and the yarn tension generated by it and exerting an unwinding or unwinding effect on the several wraps carried on the annular member 12, will together rotate the spindle if no breakage occurs on the spindle. It works like this. During the dotting operation, the yarn passes through the traveler 28 and into the annular member 12.
The motor 18 maintains its wound state and is restrained by the large holding torque of the motor 18.

The loaded package former 20 lifted from the spindle is then replaced with an empty package former.

The use of a switched electromagnetic resistance drive motor not only allows for control of the yarn winding speed during deceleration of the spindle 10, but also for dotting the loaded package former 20 while the motor rollers are stopped. This ensures that the spindle 10 and the annular member 12 are held against rotation.

Upon loading the next empty package former 20, the ring rail 32 is raised again so that the yarn is automatically wound onto the package former 20 and the winding operation can be resumed immediately. Very precise control of the motor 18 allows the spindle to be accelerated suitably quickly to re-establish the balloon condition.

The yarn wrapped around the annular member 12 may be removed by any suitable method, not shown.

The use of a switched electroresistive drive motor ensures that the yarn is given the correct number of twisting revolutions per unit length both at the beginning and end of the winding operation as well as during the winding operation. is also possible. Such precise control, not possible with other formal motors, allows the spindle speed to always be maintained properly relative to the speed of the feed roller 24 and the rotational speed of the traveler.

The splicing operation can also be performed manually or automatically. In the case of a manual splicing operation, the local control 16 is actuated by the operator to apply a small holding torque during which the operator unwinds a length of yarn and deposits the yarn at the feed roller 24. It can be made to combine with This is done by pulling the yarn by hand and rotating the loading package former against the small holding torque of the drive motor 18 so that the operator can move the yarn at the feed roller 24, shown in the arc shape in the figure. This is done by unwinding the yarns long enough to allow them to be twisted together with the yarns 22. At this point, the operator can release the spindle and accelerate it to normal operating speed.

Preferably, the yarn threads are continuously fed by feed rollers up to the point where they are twisted together and are sucked and discarded.

In the case of an automatic piecing operation, a reversal of the package former for unwinding the yarn for automatic bonding to the yarn yarn at the location of the feed roller 24 is carried out by the local control device 16; The device reverses the motor to unwind the yarn. This unwound yarn is then captured (e.g. by a suction nozzle) and directed back to the feed roller 24 for bonding. At this point, the spindle motor 18 is controlled to rapidly accelerate to re-establish the arc shape shown at 22, and then is returned to normal operating speed. The actual joining of yarn to yarn at the feed roller 24 takes place while the motor 18 is temporarily held at a rotational speed suitable for the joining operation; It is then accelerated to normal operating speed to re-establish the spinning operation. This minimizes the occurrence of substandard yarn yields from the accelerating spindle until it becomes adequate for the constant feed rate of the feed rollers.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of one spindle position of a ring frame machine, that is, a ring spinning machine. 10... Spindle, 12... Annular member, 16...
・Local control device, 18... Drive motor, 20...
Package forming tool, 22... Yarn, 24... Supply roller, 28... Traveler-130... Ring,
32...Ring rail, 50...Overall control device.

Claims (13)

[Claims] (1) A spindle (10) having a plurality of spindle positions, each of which can be fitted with a package forming device (20) for winding up a yarn, and a drive motor (10) for driving the spindle. 18), a respective ring spinning assembly consisting of a ring (30) and a traveler (28), and a feed roller (25) for feeding the yarn (22) to said assembly; a ring spinning machine (as defined herein) comprising control means (16) for controlling said motor to vary speed during A ring spinning machine characterized by a driving motor. (2) The ring spinning machine according to claim 1, wherein the overall control means controls the rotational speed of the spindle motor with respect to yarn feeding in order to control the twist imparted to the yarn. A ring spinning machine characterized by: (3) The ring spinning machine according to claim 2, wherein the motor (18) is configured to control the rotational speed of the spindle (10) with respect to the feeding speed of the yarn (22) from the feeding roller (25). ) A ring spinning machine characterized by the use of feedback from (4) A ring spinning machine according to any one of claims 1, 2, and 3, wherein the control means is specified for each spindle position and is controlled at the spindle position. Switchable magnetoresistive drive motor (1
8) forming a feedback loop and a global control device (50) effective to ensure synchronized actuation of the several spindle positions;
A ring spinning machine characterized by comprising: (5) Package former for winding up the yarn (2
0), a drive motor (18) for driving the spindle, and a ring (
30) and a traveler (28); a supply roller (25) for supplying the yarn (22) to the assembly; and control means for controlling the motor. (16,50) for operating a ring spinning machine (as defined herein) comprising: a predetermined number of turns per unit length of yarn while the motor is accelerated; controlling the acceleration of the motor from a standstill with respect to the feed rate of the yarn (22) fed from said feed roller until the spindle (10) comes to a standstill; Yarn from said supply roller (25) of
22) controlling the deceleration rate for the deceleration of the feed rate, and the drive motor is a switched reluctance drive motor. (6) A method as claimed in claim 5, in which a predetermined number of twisting revolutions per yarn unit length is achieved during acceleration and deceleration of the ring spinning machine by controlling the switched reluctance drive motor (18). monitoring the feed rate of the yarn (22) from the feed roller and the rotation speed of the traveler (28) on the ring (30) in the spindle position in order to maintain the A method of operating a ring spinning machine characterized by: (7) A method for doffing a ring spinning machine (as defined herein) having spindles with individual drive motors, wherein the individual drive motors remove loaded package formers from the spindles and feed rollers. While cutting the yarn on its package former (20) from the yarn thread (22) fed by (25), constant holding of the spindle in a stationary state to prevent the spindle from rotating A doffing method characterized in that it is a switched reluctance drive motor (18) controlled to provide a torque. (8) A method as claimed in claim 6, characterized in that the spindle (1) is operated until the loaded package former (20) is removed.
A magnetoresistive drive motor (1) that is doffed to apply a constant low level of holding torque to hold the motor (1) stationary.
8) and thereafter removing the loaded package former (20) from the spindle and cutting the yarn on the package former from the yarn thread (22) fed from the feed roller. A doffing method characterized by the step of: controlling a switching magnetoresistive drive motor (18) so as to apply a constant holding torque that is large and constant. (9) A method of splicing at the spindle position of a ring spinning frame (as defined herein) driven by individual drive motors by stopping the drive motors so as to restrain the spindles, the drive The motor is a switched reluctance drive motor, the motor is reversed by a controlled torque and accelerated after unwinding a length of yarn from the spindle (10), and the motor is accelerated after unwinding a length of yarn from the spindle (10); A splicing method characterized in that the length is spliced to the yarn at the location of the supply roller to achieve the splicing action. (10) A method according to claim 9, characterized in that the drive motor is operated to a speed intermediate when splicing of the unreeled yarn portion of a certain length to the yarn yarn is performed at the position of the supply roller. A splicing method characterized in that the acceleration of the drive motor is carried out by accelerating the drive motor and subsequently rapidly accelerating the drive motor to normal operating speed after completion of yarn splicing. (11) A method according to any one of claims 9 and 10, wherein the step of reversing the drive motor to pay out a certain length of yarn comprises rotating the drive motor in the opposite direction to pay out the yarn. controlling the drive motor (18) so that this unwound yarn portion can be returned to the position of the supply roller (25) and combined with the yarn thread (22) being led from said roller. A splicing method characterized in that the splicing method is performed as described above. 12. A method as claimed in claim 9 or claim 10, characterized in that reversing the motor is performed by pulling the length of yarn against the controlled torque. The method of joining. 13. A method as claimed in claim 12, characterized in that the reversible reluctance drive motor (
8) A joining method characterized in that the holding torque is controlled to a small holding torque.