FIELD OF THE INVENTION

The present invention relates to a textile ring spinning and twisting machine.
Particularly, the present invention relates to an apparatus and method of controlling the plurality of drive motors of a textile ring spinning and twisting machine with auto doffer arrangement.

BACKGROUND OF THE INVENTION

The typical ring spinning or twisting machine comprises plurality of spindles uniformly spaced in the longitudinal extend along both sides of the machine. The spindles individually supports the conical tubes for building of yarn named as yarn package. The yarn delivered from the drafting zone are passed via number of components such as lappet, balloon control rings, ring / traveller and finally yarn wound over the conical tubes placed on spindles. Soon after the built up of predetermined length of yarn, the full yarn packages referred as cops are to be exchanged with empty conical tubes. Now days the exchanging process is being done with help of auto doffers.

Auto doffer comprises a tube loading and unloading arrangement, a gripper rail, an intermediate peg tray and a peg transport system. In general, conical tubes are loaded into the pegs arranged in the peg tray by the tube loader arrangement. Then the empty conical tubes are displaced along the path of row of spindles so that each conical tube is kept ready in front of respective spindle for exchanging process. Soon after the cop built up is completed, empty conical tubes present in the pegs are exchanged with the full cops and the pegs carrying the cops are subsequently transported to the unloading zone of the machine.

In the existing art, there are plurality of motors used in ring spinning and twisting machine. One is a main motor along with an inverter used to drive various machine components, another is a dual speed motor used for lifting and lowering of gripper rail of auto doffer and another one is a fan motor used for pneumafil waste suction in the machine.

The problem in the existing art is

1. Normally dual speed motor is used in auto doffer to reduce the doffing time.
According to the doffing sequence, the speed of the motor is changed between slow speed and high speed so that the total time required for auto doffing is reduced. But the cost of dual speed drive motor is expensive

2. The pneumafil waste suction motor runs at constant speed. During machine running, waste cotton is accumulated in the suction box and there by the suction is reduced. This reduces the cleaning efficiency of the suction arrangement. Hence in the existing suction arrangement, suction cannot be varied according to the suction requirement of the machine. If the speed of the motor is variable, the required suction can be maintained during machine running irrespective of the waste accumulation.

Further since Pneumafil suction motor runs at constant speed , the suction capacity cannot be altered to suit material being processed / count / end breakage rate and the cop stage / spindle speed.

In light of the problems cited above, there exists a persistent need to develop a new system to address these problems

OBJECTS OF THE INVENTION

It is an object of the invention to provide a cost effective solution for substituting the dual speed motor used in a auto doffer textile ring spinning and twisting machine.

It is another object of the invention to provide a solution for controlling the pneumafil suction fan speed according to the requirement in a textile ring spinning and twisting machine.

It is yet another object of the invention to provide an apparatus and method of controlling pneumafil suction fan, Auto doffer gripper rail drive motors of textile ring spinning and twisting machine.

SUMMARY OF INVENTION

The present invention provides an apparatus comprising a suction fan motor (101) used for pneumafil waste collection and a gripper rail motor (105) used for raising / lowering of the gripper rail during bobbin exchanging process, operated in a predetermined manner wherein both motors (101, 105) are controlled by a common inverter (102) during regular running and doffing operations.

The solution according to the invention is introducing an inverter for controlling the speed of pneumafil suction fan motor and using the same inverter for auto doffer gripper rail drive provided with a standard motor instead of dual speed motor.

During normal running of the machine, the Inverter is used for controlling the pneumafil suction motor. The suction requirement can be monitored by a sensor arrangement and the fan speed can be varied by using the inverter. While auto doffing function, the fan motor will be switched over to normal power ie 50 Hz through contactor and the inverter will be used to control the auto doffer motor. According to the doffing sequence, the speed of the motor can be changed by the inverter between slow speed and high speed so that the total time required for auto doffing is reduced.

BRIEF DESCRIPTION OF THE DRAWING

Figure - 1 illustrates the schematic diagram of apparatus for controlling the drive motors of a textile ring spinning and twisting machine according to this invention.

DETAILED DESCRIPTION OF THE INVENTION

The apparatus of this invention shown in figure - 1 consists of a fan motor (101) connected with an inverter (102). The inverter is controlled with a PLC controller (103) and a man-machine interface (104). A software program comprises a set of commands defined based on predetermined sequential operations and user parameters called as algorithm is used in the PLC (103) controller. The PLC (103) controls the inverter (102) in predetermined manner as per the requirement. As per the objective of this invention, the fan motor (102) is being controlled by the inverter (102) based on PLC signals so as to get varied suction pressure as per the requirement. The machine suction requirement can be monitored by a sensor and the fan speed can be varied as per the requirement. The same inverter (102) is being used to control the gripper rail motor (105) which is a standard motor for eg cost effective asynchronous motor

During regular machine running, the inverter (102) primarily controls the pneumafil fan motor (101) of the machine. During auto doffing process, the inverter (102) controls the gripper rail motor (105)

During normal running of the machine, the inverter (102) varies the pneumafil suction fan speed based upon the requirement i.e., based on end breaks. A differential pressure switch is used to measure the suction difference between the inside and outside surfaces of the filter screen (not shown).

While auto doffing function, the fan motor will be switched over to normal power i.e., 50 Hz through contactor and the inverter will be used to control the auto doffer motor. The inverter (102) provides the required frequency to control the speed of the gripper rail motor (105). According to the doffing sequence, the speed of the motor can be changed by the inverter between slow speed and high speed so that the total time required for auto doffing is reduced

This invention provides cost effective solution for controlling the drives of pneumafil suction arrangement and auto doffer.

Although the present invention has been fully described in connection with the preferred embodiment thereof with reference to the accompanying drawings, it is to be noted that various changes and modifications are possible and are apparent to those skilled in the art. Such changes and modifications are to be understood as included within the scope of the present invention as defined by the appended claims.

We Claim

1. An improved apparatus for controlling motors of a textile ring spinning and
twisting machine comprising a suction fan motor (101) used for pneumafil waste collection and a gripper rail motor (105) used for raising / lowering of the gripper rail during bobbin exchanging process wherein said motors (101, 105) are controlled by a common inverter (102)

2. An improved apparatus for controlling motors of a textile ring spinning and twisting machine as claimed in claim 1 wherein the inverter (102) varies the pneumafil suction fan speed based upon the requirement during running of the machine

3. An improved apparatus for controlling motors of a textile ring spinning and twisting machine as claimed in claim 1. wherein machine suction requirement is monitored by a sensor and the pneumafil suction fan speed is varied as per the requirement

4. An improved apparatus for controlling motors of a textile ring spinning and twisting machine as claimed in claim 1 wherein while auto doffing function, the pneumafil suction fan motor (101) will be switched over to normal power of 50 Hz through contactor and the inverter (102) will be used to control the gripper rail motor (105)

5. An improved apparatus for controlling motors of a textile ring spinning and twisting machine as claimed in claim 4 wherein the inverter (102) controls the speed of the gripper rail motor (105) during auto doffing function

6. An improved apparatus for controlling motors of a textile ring spinning and twisting machine as claimed in claim 5 wherein the speed of the gripper rail motor (105) is changed by the inverter (102) between slow speed and high speed according to the doffing sequence

7. A method of controlling motors of a textile ring spinning and twisting machine comprising a common inverter (102) for controlling the pneumafil fan motor (101) and gripper rail motor (105), said inverter (102) varies the pneumafil suction fan speed based upon the suction requirement during running of the machine, during auto doffing function, the said inverter (102) i runs the pnemafil fan motor (101) at normal power of 50 Hz and controls the gripper rail motor between slow speed and high speed according to the doffing sequence