CZ201326A3 - Method of and device for spinning yarn at rotor spinning machine workstation - Google Patents

Abstract

The yarn piecing method comprises the steps of preparing the yarn (4) for spinning, the steps of preparing the spinning rotor (12) for spinning and final piecing steps. At least some of the final piecing steps are synchronized following the closing of the spinning unit (1). After the spinning unit (1) is closed, the spinning unit (1) can be opened without the need for the entire piecing cycle, and only the preparation steps of the spinning rotor (12) for spinning and / or for the next piecing attempt can be opened before activation of the yarn control member (5). or the yarn preparation steps (4) for spinning. The spinning unit (1) comprises a fixed portion (11) and a hinged portion (13) and a swivel portion position sensor (2) comprising a permanent magnet and a associated reed contact (21). The reed contact (21) is mounted on a fixed part (11) of the spinning unit and connected to the work station control unit (9). The permanent magnet (22) is mounted against the reed contact (21) on the hinged portion (13) of the spinning unit, which moves on opening so that the permanent magnet (22) moves away from the reed contact (21) upon opening.

Description

Method and device for spinning yarn at the workplace of a rotor spinning machine

Field of technology

The invention relates to a method of spinning yarn at a workstation of a rotor spinning machine comprising the steps of preparing a yarn for spinning, the steps of preparing a spinning rotor for spinning and final spinning steps, wherein at least some final spinning steps are synchronized following closing of the spinning unit.

The invention further relates to a device for spinning yarn at the work station of a rotor spinning machine, the spinning unit of which comprises an openable part and a position sensor of the openable part comprising a permanent magnet and a tongue contact associated therewith.

Prior art

The method of spinning yarn at a work station of a rotor spinning machine includes the steps of preparing the yarn for spinning, the steps of preparing the spinning rotor for spinning, and the final spinning steps. The steps of preparing the spinning rotor for spinning include at least finding the end of the yarn on the spool or preparing the auxiliary yarn when spinning on an empty core, unwinding and measuring the length of yarn needed for spinning, guiding the yarn into its spinning path in which the yarn spreader is out of reach between the rollers of the take-off device, the formation of the spinning end of the yarn and its introduction into the discharge tube. The steps of preparing the spinning rotor for spinning include at least opening the spinning unit to the cleaning position, cleaning the stopped spinning rotor, and closing the spinning unit. The final spinning steps include at least initiating the feeding of the fiber sliver to the unifying device, discharging the fibers from the unifying device out of the spinning rotor for a period of time, lowering the spinning end of the yarn onto the rotor collecting groove and initiating yarn take-up and winding.

PS3869CZ

Patent CZ 290468 describes that at least some of the final spinning steps are synchronized following the closing of the spinning unit, whereby the optimum quality of the spool is achieved repeatedly at all work stations of the machine. The disadvantage of this solution is that if, after starting the final spinning steps, the prepared spinning end of the yarn is lost or damaged before spinning and the operator sees that spinning cannot take place successfully, he must let the whole spinning cycle run and the operator must all spinning steps, resulting in lost productivity of the machine. For example, after closing the spinning unit, the operator fails to insert the spinning end of the yarn into the discharge tube of the spinning unit, or the spinning end is not sucked into the discharge tube.

In the device for carrying out the yarn spinning method on a rotor spinning machine according to CZ 290468, each openable cover of the spinning unit is provided with a spinning unit closing sensor, which is connected to the input of the workplace control unit. The entire sensor is formed on the openable lid of the spinning unit and consists of a movable permanent magnet housed in a labyrinth and a tongue contact which is associated with the end of the groove in which the magnet is in the folded position of the spinning unit when cleaning the spinning rotor. Such a sensor is able to signal the start of closing of the spinning unit at the moment when the movable permanent magnet is disconnected from the tongue contact, but the actual closing can take place at different speeds, so that information about its start may not always be well used. In addition, the installation of any sensor on the movable cover of the spinning unit requires a connection to the power supply and / or the control unit, which increases the complexity of the device and its cost.

The object of the invention is to create a more economical method of spinning and to simplify the current device.

The essence of the invention

The object of the invention is achieved by a method of spinning yarn at a working place of a rotor spinning machine, the essence of which consists in that after closing the spinning unit the spinning unit can be opened in the time interval before activating the yarn control member without having to perform the whole

PS3869EN and for the next spinning experiment, only the steps of preparing the spinning rotor for spinning and / or the steps of preparing the yarn for spinning are repeated. This will improve the working use of the machine.

From the point of view of reliability and simplicity of construction, it is advantageous if the closing of the spinning unit is monitored by a sensor which comprises a reed contact housed in a fixed part of the spinning unit and connected to a control system which switches on and off by a permanent magnet housed in the hinged part of the spinning unit.

The essence of the device according to the invention lies in the fact that the tongue contact is mounted on a fixed part of the spinning unit and connected to the workplace control unit, the permanent magnet being mounted against the tongue contact on the hinged part of the spinning unit which moves when opened. away from the reed contact when opened. In addition to reliable operation, this arrangement saves the connection of the hinged part of the spinning unit by electrical conductors and eliminates the risk of damaging them.

Explanation of drawings

An exemplary embodiment of the device according to the invention, on which the method according to the invention can be carried out, is schematically shown in the accompanying drawings, in which FIG. 1 shows a part of a work station with an open spinning unit, and FIG. 2 part of the workplace with the spinning unit closed.

Examples of embodiments of the invention

The method according to the invention will be described on an exemplary embodiment of a working place of a rotor spinning machine, of which only the parts necessary for understanding the method are shown in the drawings and the other parts of the working place are not shown.

The illustrated work station comprises a spinning unit 1, which comprises a fixed part 11 in which a spinning rotor 12 is mounted and coupled to a drive in a known manner. A hinged part 13 is rotatably mounted on the fixed part 11 in a known manner. A feeding device 14 is arranged in the hinged part 13.

PS3869EN of the fiber strand 3, to which the fiber strand separator 15 is assigned, comprising a combing roller. The outlet of the separating device 15 opens into the spinning rotor 12. A yarn discharge tube 16 from the rotor 12 is arranged in the hinged part 12 of the spinning unit 1. Above the spinning unit 1 a yarn take-off device 6 is arranged and above it a winding device 7 in which the yarn is 4 is wound on a spool 8. Between the outlet of the spun yarn discharge tube 16 and the take-off device 6, a yarn control member 5 (spinner) is arranged, which is connected to the work station control unit 9 in a known manner (not shown).

The spinning unit 1 comprises a position sensor 2 of the hinged part 13, which is formed by a tongue contact 21 housed in a fixed part 11 of the spinning unit, its switching contacts being connected in a known manner to the machine control unit 9, in the embodiment shown by a cable 23. contact 21, a permanent magnet 22 is mounted on the hinged part 12 of the spinning unit 1, which, when the hinged part of the spinning unit is opened, moves away from the tongue contact 21, which opens and approaches and closes the tongue contact 21 again when closed. unit 9 closed state.

In the particular embodiment shown, the hinged part 13 comprises a body 131 of the feeding and separating device rotatably mounted on the machine frame and a body 132 of the rotor which is rotatably mounted in the body 131 of the feeding and separating device, for example on the pin 133. The permanent magnet 22 of the position sensor 2 is mounted on rotor body 132. When the folding part of the spinning unit is tilted, the body 131 of the feeding and unifying device rotates and pulls the rotor body 132 with it, thus moving the rotor away from the drive (not shown), so that the permanent magnet 22 moves away from the tongue contact 21.

The steps required to restore spinning at the workstation of the rotor spinning machine can be divided into three groups, namely, the steps of preparing the yarn 4 for spinning, the steps of preparing the spinning rotor 12 for spinning, and the final spinning steps.

The steps of preparing the yarn 4 for spinning comprise at least finding the end of the yarn 4 on the spool 8 or preparing the auxiliary yarn when spinning on an empty core, unwinding and measuring the length of the yarn 4 needed to spin, guiding

PS3869EN yarn 4 into its spinning path at the working place of the rotor spinning machine, in which the yarn 4 is out of reach of the yarn distributor and out of the clamp between the rollers of the take-off device 6 and optionally forming or modifying the yarn end 4 if this yarn end 4 has not been formed measuring the length of the yarn 4 for spinning.

The steps of preparing the spinning rotor 12 for spinning include at least opening the hinged portion 13 of the spinning unit 1 to the cleaning position, cleaning the stopped spinning rotor 12, and closing the hinged portion 13 of the spinning unit, thereby restoring the vacuum in the spinning rotor 12.

The final spinning steps are performed after closing the spinning unit 1 and comprise introducing and sucking the spinning end of the yarn 4 into the yarn discharge tube 16 from the spinning rotor 12, starting to feed the fiber strand 3 to the separating device 15, discharging fibers from the separating device 15 outside the spinning rotor 12 a certain time interval, activation of the yarn control member 5, which in predetermined time sequences ensures the lowering of the spinning end of the yarn 4 onto the collecting groove of the spinning rotor 12 and the start of pulling and winding the yarn 4 or monitoring the quality of the spun yarn 4.

When the spinning process is interrupted at the working place of the rotor spinning machine, either due to yarn break 4, winding of the required length of yarn 4 on the spool 8, or for other reasons, the fiber spool feed device 14 stops and the wound spool 8 moves away from the spool. drive roller of the winding device 7 and stops.

In a semi-automatic rotor spinning machine, the means of the work station involved in the spinning are moved to their spinning positions. This displacement is due to either mechanical or electrical bonding.

When resuming spinning at the workplace, the operator manually performs the steps of preparing the yarn 4 for spinning and the steps of preparing the spinning rotor 12 for spinning before closing the folding portion 13 of the spinning unit 1.

After performing the above steps, the operator starts closing the spinning unit 1. At the moment of closing the hinged part 13 of the spinning unit 1, he issues

PS3869EN sensor 2 of the position of the hinged part 13 of the spinning unit 1 signal of closing of the spinning unit 1, which is introduced into the control unit 9, which starts the spinning cycle.

After closing the spinning unit 7, the spinning rotor 12 starts to rotate and the operator forms the spinning end of the yarn 4 and inserts it into the yarn discharge tube 16, into which it is sucked under vacuum, or the operator inserts the previously formed yarn end 4 into the discharge tube 16. After being sucked into the take-off tube 16, the spinning end of the yarn 4 is held by the yarn control member 5 at a predetermined distance from the collecting groove of the spinning rotor 12, ready for spinning.

From the moment the spinning unit 1 is closed, the final spinning steps follow in this order. Initiation of the feeding of the fiber strand 3, the fibers fed to the separating device 15 being discharged therefrom outside the spinning rotor 12. At a predetermined time from the closing of the spinning unit 1 which is longer than the interval of initiating the feeding of the fiber strand 3, i.e. at the time it is assumed that the spinning rotor 12 has reached operating or spinning speed, the discharge of fibers outside the spinning rotor 12 is terminated and the single fibers are fed from the separating device 15 to the spinning rotor 12, where they are deposited in a ribbon of fibers. At a predetermined time interval from the closing of the spinning unit 1, the yarn control member 5 is activated, which releases the yarn 4 onto the collecting groove of the spinning rotor 12, where the spinning end of the yarn 4 connects to the ribbon of fibers and starts to pull and wind the yarn 4. will resume the spinning process.

The intervals of the final spinning steps started on the basis of the time interval from the closing of the spinning unit 1 can be shortened or extended according to the technological requirements of spinning and spinning.

After closing the spinning unit, in the time interval before activating the yarn control member 5, the spinning unit 1 can be opened without having to perform the whole spinning cycle, and only the steps of preparing the spinning rotor 12 for spinning and / or preparing yarn 4 for spinning are repeated for the next spinning experiment.

PS3869CZ

List of reference numerals spinning unit fixed part of the spinning unit spinning rotor folding part of the spinning unit

131 body of the feeding and separating device

132 rotor body

133 pin sliver feeder fiber sliver unloading device sliver take-off tube spun yarn from rotor position sensor hinged part of spinning unit reed contact permanent magnet cable yarn sliver yarn control member (yarn) yarn take-off device yarn winding device spool workplace control unit

Claims (3)

PATENT CLAIMS A method of spinning yarn at a working station of a rotor spinning machine, comprising the steps of preparing a yarn (4) for spinning, the steps of preparing a spinning rotor (12) for spinning and final spinning steps, wherein at least some final spinning steps are synchronized following closing of the spinning unit ( 1), characterized in that after closing the spinning unit (1) the spinning unit (1) can be opened in the time interval before activating the yarn control member (5) without having to perform the whole spinning cycle and only the spinning preparation steps are repeated for the next spinning experiment. rotor (12) for spinning and / or the steps of preparing the yarn (4) for spinning. Method according to claim 1, characterized in that the closing of the spinning unit (1) is monitored by a position sensor (2) of the folding part (13) of the spinning unit, which comprises a tongue contact (21) connected to the control system and housed in a fixed part ( 11) a spinning unit which is switched on and off by a permanent magnet (22) housed in a hinged part (13) of the spinning unit. A device for spinning yarn at a working place of a rotor spinning machine, the spinning unit (1) of which comprises a fixed part (11) and a tilting part (13) and a position sensor (2) of the tilting part comprising a permanent magnet and a tongue contact associated therewith, characterized by in that the tongue contact (21) is mounted on the fixed part (11) of the spinning unit and connected to the control unit (9) of the workplace, the permanent magnet (22) being mounted against the tongue contact (21) on the hinged part (13) of the spinning unit. unit, which moves when opened, so that the permanent magnet (22) moves away from the tongue contact (21) when opened.