FIELD OF THE INVENTION

The present invention relates to an improved driving arrangement of a textile spinning machines. Particularly the invention related to an improved driving mechanism in a textile ring spinning machines. More particularly the present invention is concerned to the drafting system driving arrangement in a ring spinning machines.

BACKGROUND OF THE INVENTION

In general, the drafting device used in a spinning machine such as a ring spinning machine or a roving machine, is of a three-line type which comprises of front, middle, and back rollers, in which front bottom, middle bottom, and back bottom rollers are driven by a single motor. These bottom rollers of the drafting units are interconnected at one end by a gear train which is driven by a motor. And these. rollers extend in a continuous length along the machine from one end to the other so as to serve each of the drafting units and are supported in bearings at spaced intervals. With this arrangement a problem would arise upon lengthening the machine because of the occurrence of excessive twisting of the rollers when a driving tensional force is applied to them. The degree of twist exhibited by these rollers varies from a maximum value at the driven end of these rollers to a minimum value at their free ends.

Apart from this, there exists a device in which, in order to facilitate draft ratio change, the front bottom roller and the back bottom roller are respectively driven by separate motors, and a device which exhibits a higher machine length as a result of an increase in the number of spindles, in which motors are provided at both ends of the machine, the bottom roller being driven from both sides of the machine. In addition to this, a driving motor and transmission units is provided in middle of the drafting unit for controlling the torsional force variation occurred in the entire length of drafting rollers. Such type of machine is disclosed in US patent 4161862.

It is also known from European patent 1609893 that the three roller drafting system wherein all of the front, middle and back bottom rollers are divided at the longitudinal center of the machine in order to control and maintain the torsional force propagation, and is driven by their corresponding individual motors.

However while going for furthermore number of spindles in a long spinning machines, the aforesaid drafting arrangements are not feasible for uniform torsional force distribution. Due to this reason, a variation in resultant yarn quality occurs during starting and stopping of the machine. These disadvantageous effects of existing technology posed to develop an improved drafting roller driving arrangement for ring spinning / twisting machines.

OBJECTS OF THE INVENTION

The primary object of the present invention is to provide a drafting roller driving arrangement which distributes uniform torsional force over the entire length of the drafting system.

One more object of the present invention is to provide a simplified construction of spinning machine of higher machine length that can be easily extended in lengthwise according to the required number of spindles.

Yet another object of the present invention is to provide spinning frame of higher
machine length which will provide a constant yarn quality without any variation.

SUMMARY OF THE INVENTION

The present invention related to an improved drafting system driving arrangement wherein at least three bottom drafting rollers are arranged next to each other in a set. The spinning machine according to the present invention comprises at least four drafting modules in which the bottom drafting rollers are driven by the driving means located at the driving end of the each module. Therefore at least four drafting modules (A,B,C,D) are provided for a spinning machine of higher machine length (Refer Fig-1). In order to keep a uniform torsional force distribution over the bottom drafting rollers, each drafting modules (A,B,C,D) are being separated from each other between the machine ends. The driving end of each set of the bottom drafting rollers of each drafting module (A,B,C,D) is interconnected by drive transmission means.

The drafting modules (A& C), at the head stock, are provided with a middle roller which is substantially divided between the ends and is rotatably supported by the end bearings. Therefore the first part of said middle roller is driven by the driving means provided at the driving end, whereas the other part of middle roller gets the drive from the front bottom roller through gear transmission means provided between head stock and end stock. Furthermore the drafting modules (B& D) are driven by their corresponding driving means provided at the end stock of the machine.

According to the present invention there is provided

An improved drafting system driving arrangement in a textile ring spinning machine comprises a head stock (1) and end stock (2); at least four drafting modules A, B, C, D, each drafting module having a plurality of drafting rollers (3, 4, 5), said drafting rollers driven by driving means (6, 7, 8, 9) provided at one end of each module, wherein at least one transmission means (12) is provided between said head stock (1) and end stock (2).

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS

Fig-1 is the schematic illustration of drafting roller driving arrangement of a ring . spinning machine according to the present invention.

Fig-2 illustrates the one side of the ring spinning machine drafting roller arrangement
with end bearings according to the present invention.

Fig-3 is the schematic illustration of drafting roller driving arrangement of another
embodiment of ring spinning machine according to the present invention.

Fig-4 represents the the one side of the ring spinning machine drafting roller
arrangement with end bearings according to Fig-3.

Fig-5 represents the schematic view of the of the further embodiment of ring spinning
machine according to the present invention.

DETAILED DESCRIPTION OF THE INVENTION

The ring spinning machine according to the present invention is shown in Fig-1 of the drawings, wherein a plurality of drafting modules (A,B,C,D) are provided in between the headstock (1) and end stock (2) of the spinning machine. The headstock (1) comprises the driving/transmission mechanism for spindles and ring rails (not shown), whereas the end stock (2) comprises the suction & cleaning arrangements which also not shown. The machine is divided into two sides by the central axis (X-X) as a mirror image which indicates the symmetrical construction of working components. Each drafting modules (A,B,C,D) comprises at least three bottom drafting rollers (3,4,5) which are arranged next to each other in a set. Said bottom, drafting rollers (3,4,5) are driven by their corresponding driving means (6,7,8,9) located at the driving end of the each module (A,B,C,D). The couplet driving means (6,8) and (7,9) are interconnected through their corresponding frequency converters (10,11) respectively, i.e., the pair driving means (6,8) are interconnected through a common frequency converter (10) and the other pair of driving means (7,9) are interconnected through a common frequency converter (11).

Individual frequency converters can also be used with each driving means (6,7,8,9) as an embodiment according to the requirement. As one more variant of the invention, the driving module (A,C) and (B,D) can be driven by their common driving means (6,7) respectively which is not shown. An transmission means (12) is provided at the end of couplet drafting modules (A,C) wherein the gear train (not shown) is housed for driving the part of the middle roller (4). Said transmission means (12) is preferably a gear drive, pulley drive or chain drive.

Referring to Fig-2 of the drawings, the bottom drafting rollers (3,4,5) arrangement according to the present invention is shown. Here the drafting modules (A,B) comprises the bottom drafting rollers (3,4,5) which are driven by their corresponding driving means (6,7) respectively. In drafting module-A, the middle bottom roller is divided into first part (4a) and second part (4b). And the divided ends of first part (4a) and second part (4b) is rotatably supported by the end bearings (13) whereas the other ends are connected to their corresponding gear transmission which is not shown. The driving means (6) of the module-A is drivingly connected to front bottom roller (3), first part of the middle roller (4a) and back bottom roller (5) through gear transmission means (not shown). And the second part of the middle roller (4b) is drivably connected to the to the front bottom roller (3) through gears/pulleys/chains (not shown) at the transmission means (12).

Drafting module-B comprises a plurality of bottom drafting rollers (3,4,5) which are coaxially mounted with respect to the bottom drafting rollers (3,4,5) of module-A.

These rollers are interconnected through gear transmission (not shown) at the driving end and is driven by the driving means (7). Other ends of the said bottom drafting rollers (3,4,5) are rotatably supported by the end bearing arrangement (13*) provided very near to the intermediate transmission means (12).

According to the present invention while the machine is running (Refer Fig-2), the each driving means (6,7,8,9) drives the bottom drafting rollers (3,4,5) of their . corresponding modules (A,B,C,D). Since the modules (A& C) are adapted for more number of working stations, the apron mounted middle roller (4) of drafting module (A,C) carries more load than the front roller (3) and back roller (5). Hence for avoiding the variation of torsional force propagation over the entire length of the middle roller (4), it is divided into first part (4a) and second part (4b). Therefore the drive from the driving means (6,8) is transmitted to front roller (3), first part of middle roller (4a) and back roller (5) through gear or belt-pulley transmission means (not shown). Meanwhile the transmission means (12) transmits the drive from other end of front roller (3) to second part of middle roller (4b).

Thus the load on the middle roller is divided and thereby the effective torsional force distribution has been achieved in modules (A& C).

Since the modules (B& D) are adapted for less number of working stations, the bottom drafting rollers (3,4,5) exists only for short lengths. These rollers are interconnected through gear/belt-pulley transmission means (not shown) at the driving end and is driven by the driving means (7). Whereas the other ends of the said bottom drafting rollers (3,4,5) are rotatably supported by the end bearing arrangement (13'). Therefore the load on each roller (3,4,5) is transmitted to only for a effective length and the variation in torsional force can be avoided especially in heavy loaded middle roller (4). According to the requirement a plurality of drafting modules (A,B,C,D) can be arranged next to each other for ring spinning machines as shown in Fig-5 as an embodiment.

As an embodiment shown in Fig-3 &Fig-4 of the present invention, both middle and back bottom rollers (4,5) can be divided into first part (4a, 5a) and second part (4b, 5b). The divided ends of first part (4a, 5a) and second part (4b, 5b) are rotatably supported by the end bearings (13), whereas the other ends are connected to their corresponding gear transmission of transmission means (12). Here the front roller (3) drives the second part (4b, 5b) of both middle and back bottom rollers (4,5) through gear transmission of gearbox (12). And their adjacent drafting modules (B& D) is driven by their corresponding driving means (7 & 9). The ends of the said bottom drafting rollers (3,4,5) are rotatably supported by the end bearing arrangement (131) as explained in the Fig-1&2 and functions as described.

As an another embodiment of the present invention, the Fig-5 of the drawings shows the plurality of modules (A,B,C,D) with plurality of gearbox (12) are provided in between the ends (1,2) of the spinning machine. At the headstock end (1) of the machine, the combination of modules (A,B,C,D) with a transmission means (12) are provided as of in Fig-1 to Fig-4 of the drawings. And the end stock (2) end of the machine also comprises the modules (A,B,C,D) in the possible combination of order. Furthermore a pair of of juxtaposed modules (B,D) is provided in between the aforesaid combination which can be extended likewise for more length of the machine.

Because of the bottom drafting rollers are arranged as modules, they are capable of transmitting effective torsional force throughout the entire length of a ring spinning machine. Thus the quality of resultant yarn would not be affected due to torsional variation. And the simplified construction of the present invention provides easy way of mountings and drafting module extension for ring spinning machines.

While the invention has been described above by way of embodiment, the invention is not limited to such embodiment. Various modification, equivalent substitution or improvement may be made to the invention without departing from spirit and scope of the invention as described.

WE CLAIM:

1. An improved drafting system driving arrangement in a textile ring spinning machine comprising a head stock (1) and end stock (2); at least four drafting modules (A, B, C, D) each drafting module having a plurality of drafting rollers (3, 4, 5), said drafting rollers driven by driving means (6, 7, 8, 9) provided at one end of each module, wherein at least one transmission means (12) is provided between said head stock (1) and end stock (2).

2. An improved drafting system driving arrangement in a textile ring spinning machine as claimed in claim 1 wherein the said transmission means (12) is gear drive, pulley drive or chain drive.

3. An improved drafting system driving arrangement in a textile ring spinning machine as claimed in claim 1 wherein the middle and / or back rollers of at least one drafting module (A, B, C, D) is divided into two parts wherein the first part is driven by driving means (6, 7, 8, 9) at driving end and second part is driven from front roller by transmission means through a train of gears.

4. An improved drafting system driving arrangement in a textile ring spinning machine as claimed in claim 1 wherein said transmission means having a train of gears is provided for driving a part of middle and / or back rollers of the drafting system.

5. An improved drafting system driving arrangement in a textile ring spinning machine as claimed in claim 1 wherein driving means of pair of drafting modules at each end of machine is being interconnected by a frequency converter.

6. An improved drafting system driving arrangement in a textile ring spinning machine as claimed in claim 4 wherein individual frequency converter is being provided for each driving means.

7. An improved drafting system driving arrangement in a textile ring spinning machine as claimed in claim 1 wherein bottom drafting rollers of drafting module on one side of machine is being mounted and aligned co-axially with corresponding bottom rollers of other module on the same side.

8. An improved drafting system driving arrangement in a textile ring spinning machine as claimed in claim 1 wherein similar arrangement of drafting module with driving means is provided on both sides of spinning machine.

9. An improved drafting system driving arrangement in a textile ring spinning machine as claimed in preceding claims wherein the back roller and / or the middle roller of preferable modules are being divided into two parts and each divided end is being supported on bearing.

10. An improved drafting system driving arrangement in a textile ring spinning machine as claimed in preceding claims wherein a plurality of drafting modules with transmission means are provided between both ends of machine.