WO2013054214A1

WO2013054214A1 - An improved top arm for textile machines

Info

Publication number: WO2013054214A1
Application number: PCT/IB2012/054219
Authority: WO
Inventors: Krishnakumar Narayanaswamy; Ramamoorthi PERUMALSAMY; Mani Govindarajulu; Krishnan Chandiran ALANGAYAM
Original assignee: Lakshmi Machine Works Ltd.
Priority date: 2011-10-13
Filing date: 2012-08-21
Publication date: 2013-04-18

Abstract

A top arm for textile machines such as ring spinning, yarn twister or processing and other similar textile processing machines is disclosed, which comprises links or members configured by an additional pin (9), and its profile (7) for sliding with a groove (8) for the ease of locking and unlocking operation of the top arm in the textile yarn spinning machines. The top arm over the drafting elements of the spinning machines has the construction of simple and improved design for locking and unlocking operation.

Description

AN IMPROVED TOP ARM FOR TEXTILE MACHINES FIELD OF THE INVENTION

The present invention relates to an improved and user friendly operation of top arm in the spinning machines such as ring spinning, yarn twisting or processing and other similar textile processing machines. This invention is particularly related with the construction of simple and improved design for locking and unlocking operation of the top arm over the drafting elements of the spinning machines.

BACK GROUND OF THE INVENTION In textile yarn spinning machines, a roving machine is a machine, which reduces courser sliver drawn from the sliver can into a finer thread or roving, making it more regular and even puts more twists and winds it onto a smaller roving tube. The drafting arrangement drafts the material with a draft between 5 and 15. The delivered strand is too thin to hold itself together at the exit of the front bottom roller. Bobbin and flyer are driven separately, so that winding of the twisted strand is carried out by running the bobbin at a higher peripheral speed than the flyer. The bobbin rail is moving up and down continuously, so that the coils must be wound closely and parallel to one another to ensure that as much as material is wound on the bobbin. Thus, finally an end product of roving bobbin is produced from the roving or speed frame.

From this machine, the material output as roving bobbin goes to the spinning frame. A ring spinning frame is constructed on each side of the frame by the spindles, above them are drafting rollers and on top is a creel loaded with bobbins of roving. The roving passes downwards from the bobbins to the drafting rollers. Here the back roller steadied the incoming thread, while the front rollers rotated faster, pulling the roving out and making the fibers more parallel. The rollers are individually adjustable, originally by mean of distance between rollers and drafting loads. The attenuated roving now passes through a thread guide that is adjusted to be centered above the spindle. The attenuated roving passes down to the spindle assembly, where it is threaded through a minute ring shaped structure called the traveller. The traveller moves along the ring. From here the thread is attached to the existing thread on the spindle. The traveller and the spindle share the same axis but rotate at different speeds. The spindle is driven and the traveller drags behind thus distributing the rotation between winding up on the spindle and twist into the yarn. The bobbin is fixed on the spindle. Spindles could rotate at speeds up to 25000 rpm, this spins the yarn. The up and downing rail motion guides the thread onto the bobbin into the shape required as an end product i.e a yarn cop.

For achieving the above phenomena, the prior input material to roving frame are carded or drawn sliver, which is thick, untwisted strand that tends to be hairy and creates fly. So, the draft for the conversion of this courser sliver to thin yarn required to be around 300 to 500. For this process, the drafting devices in ring spinning, roving or other similar textile processing machines are arranged, which is capable of processing this strand in a single drafting operation to create a yarn that meets all the normal demands on such yarns. Thus, the drafting process plays a vital role in the production of quality spun yarn.

The drafting apparatus of a drafting frame or a roving frame or other similar textile processing machines typically includes a plurality of consorted pairs of rollers, each roller pair having an top roller and bottom roller. The bottom rollers are usually mounted on the frame and the top roller comprising cots and apron respectively, are mounted on a carrier. This carrier is termed as top arm or draft roller bearing arm. They are capable of feeding two spindle at a time and amounts to half the number of spindles constructed in the frame. They are generally pivotally arranged at one end on a pivot shaft for pivoting between the locking and unlocking position. In locking position, top rollers are cooperatively engaged with respect to their associated bottom rollers to form nips there between for the feed of textile material through the nips. During the raised or unlocking position, the top rollers supported at a spacing upwardly from their respective associated bottom rollers. Therefore, the drafting of textile material such as sliver or roving is influenced by the locking of the top rollers of the top arm on the bottom rollers. Henceforth, in the locked condition, helps in the rigid and stable application of top arm loading which assists in uniform drafting process. For the operation of the top arms as to lock for load and load releasing, and also to hold the top rollers mounted in the top arm at a higher position during load released condition, different embodiments are used in different top arms. In an embodiment, four bar mechanism or toggle type is used for locking for load and for load releasing. In this toggle type, operation of locking and unlocking mechanism is easily possible by single hand. The main disadvantage of this invention is the lack of cost effectiveness, as manufacturing cost hikes by four bar utilization in this mechanism. The cost will be significant when calculated for the entire length of the machine.

In an another embodiment, instead of four link, three link structure of the top arm is used for the locking and unlocking operation. First one of the link is a fixed member, which is fixed with the fixed component of the frame. The second member bears the top rollers and pivoted with the fixed member. The third member forms the connecting link between the fixed member and the second member during locking. The third member is pivoted with the second member and it is made to engage and disengage with the fixed member. While the third member is engaged with the fixed member at a fixed point, a three link rigid structure is formed. While the third member is disengaged from the fixed member, both the second member and the third member are free to move in the space without any constrains.

The load releasing is done by lifting or operating the third member by one hand. After load releasing, to keep the top rollers at a higher position, the second member is lifted up separately by another hand and the third member is made to rest on the fixed member at some position so that the top rollers assembled with the second member are kept at a higher position. But, in this method, the mechanism is very critical and complicated in the mode of operation by using two hands. There is also an inconvenience, that the top arm is operated in two steps to keep the top rollers at a higher position, as first step to lift the third member and the second step is to lift the second member with its top rollers at a higher position, which leads to the increased work pressure and fatigue among the operators.

OBJECTS OF THE INVENTION

The object of the present invention is to eliminate the complex and multiple step operation of locking and unlocking mechanism by single step in the top arm of the textile yarn spinning machines. Another object of the present invention is to construct a simple and cost effective operation without adding any additional link in the top arm of the textile yarn spinning machines.

Yet another object of the present invention is to reduce operators fatigue and their work load by providing an user friendly top arm operations in the textile yarn spinning machines.

SUMMARY OF THE INVENTION

The invention provides an improved and simple top arm operations in the textile yarn spinning machines. This mechanism is used with beneficial attributes in the components for the operation of locking and unlocking mechanism in the top arm of the textile spinning machines. According to this invention, an improved top arm for textile machine having linkage mechanism for locking and unlocking operation, wherein said mechanism comprises a fixed member provided with atleast a groove to receive an additional pin. This linkage mechanism comprises three bar linkage mechanism of fixed member, second member and third member. So, this construction helps in the formation of a simple and cost effective operation without adding any additional link in the top arm of the textile yarn spinning machine. Only, an additional pin is added on the third member and a profile for pin sliding is added with a groove on the fixed member of the top arm. The profile is constructed such that after releasing from load by lifting the third member, the additional pin slides over the profile to give a constructive movement to the third member. After reaching a particular position, the pin rests in a groove or cavity, which is at the end of the profile. A spring presses the pin in the cavity so that the pin can be firmly positioned and also released from the cavity only by a force applied to the third member. Through this modifications, the complex and multiple step operation of locking and unlocking mechanism are simplified by a single step to keep the upper rollers of the top arm at a higher position. By mere, ease application of force by single hand to the third member, the pin slides back to its original position so concurrently the top arm rest towards its locking position. Thus, reduces operators fatigue and their work load by providing an user friendly top arm operations in the textile yarn spinning machines. BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS Figure- 1 : illustrates an existing locked position(6) for the top arm(1 ) loading in the textile yarn spinning machine.

Figure- 2: illustrates an existing unlocking position for top arm(1 ) with its second member(3) kept at the higher position(5) in the textile yarn spinning machine.

Figure- 3 &3a: illustrates a new method of locked position(6) and its schematic view for the top arm(1 ) loading in the textile yarn spinning machine.

Figure- 4 &4a: illustrates a new method of load released position by unlocking its third member(4) and its schematic view for the top arm(1 ) in the textile yarn spinning machine.

Figure- 5 &5a: illustrates a new method of unlocking position for top arm(1 ) with its second member(3) kept at the higher position(5) and its schematic view in the textile yarn spinning machine.

DETAILED DESCRIPTION OF THE INVENTION

Figure- 1 illustrates an existing locked position(6) for the top arm(1 ) loading in the textile yarn spinning machine. It is one of the well-known technique depicts the three bar linkage top arm(1 ) loading system.

This three bar linkage mechanism constitutes the fixed member(2), second member(3) and the third member(4). The fixed member(2) is generally fixed at one end and the other two members pivoted for pivoting between the locking and unlocking position. Above the fixed member(2), second member(3) is arranged for holding the plurality of top rollers and pivoted an end on the fixed member(2). Each top rollers has an associated bottom rollers, which is fixed with frame (not shown in figure). In locking position, top rollers in the second member(3) are cooperatively engaged with respect to their associated bottom rollers to form nips there between for the feed of textile material through the nips. During the raised or unlocking position, the top rollers in the second member(3) supported at a spacing upwardly from their respective associated bottom rollers. The third member(4) helps in the operation of handling the locking and unlocking position for the top arm(1 ) loading. They forms a connecting member between the fixed member(2) and the second member(3). The third member(4) is pivoted with the second member(3) and it is made to engage and disengage with the fixed member(2). While the third member(4) is engaged with the fixed member(2) at a fixed point, a three link rigid structure is formed as to locked position(6) of the top arm(1 ) loading is achieved.

Figure- 2 depicts an existing unlocking position for top arm(1 ) with its second member(3) kept at the higher position(5) in the textile yarn spinning machine. For this operation of unlocking the top arm(1 ), the third member(4) is pivoted with the second member(3) and it is made to engage and disengage with the fixed member(2). The third member(4) is disengaged from the fixed member(2) so that both the second member(3) and the third member(4) are free to move in the space without any constrains.

The load releasing of the top arm(1 ) is done by lifting or operating the third member(4) by one hand. After load releasing, to keep the top rollers at a higher position(5), the second member(3) is lifted up separately by another hand and the third member(4) is made to rest on the fixed member(2) at some position so that the top rollers assembled with the second member(3) are kept at a higher position(5). But, in this method, the mechanism is very critical and complicated in the mode of operation by using two hands. There is also an inconvenience, that the top arm(1 ) is operated in two steps to keep the top rollers at a higher position(5), as first step to lift the third member(4) and the second step is to lift the second member(3) with its top rollers at a higher position(5), which leads to the increased work pressure and fatigue among the operators.

Figure- 3 illustrates a new method of locked position(6) and its schematic view for the top arm(1 ) loading in the textile yarn spinning machine. This clearly shows, about the locked or load applied condition(6) of the top arm(1 ) in the textile spinning machine. This new method of linkage mechanism is done by three bar linkage mechanism.

The three bar linkage comprises mainly fixed member(2), second member(3) and third member(4). The fixed member(2) is generally fixed at one end and the other two members pivoted for pivoting between the locking and unlocking position. Above the fixed member(2), second member(3) is arranged for holding the plurality of top rollers and pivoted an end on the fixed member(2). Each top rollers has an associated bottom rollers, which is fixed with frame (not shown in figure). During locking position, top rollers in the second member(3) are cooperatively engaged with respect to their associated bottom rollers to form nips there between for the feed of textile material through the nips. By raised or unlocking position, the top rollers in the second member(3) held at a spacing upwardly from their respective associated bottom rollers. Lastly, the third member(4) helps in the operation of handling the locking and unlocking position for the top arm(1 ) loading.

The third member(4) is pivotally arranged by a pivot pin(12) on the second member(3), has an additional pin(9) fixed at an end. For an additional pin(9), a profile(7) with a groove(8) is configured for the constructive movement in the fixed member(2). Alternatively, the additional pin(9) can also be provided in the fixed member(2) and the groove can be provided in the third member(4). The third member(4) and second member(3) operatively connected with fixed member(2) between locking and unlocking position. The additional pin(9) moves along by the movement of the third member(4) of the top arm(1 ). The cycle of movement of additional pin(9) in the third member(4) plays a vital role in the locking and unlocking operation of the top arm(1 ) in the machine frame. Under the locked position(6) of the top arm(1 ), the third member(4) along with the second member(3) merges and comes to its locked position(6) and its additional pin(9) rests at position(C) in the profile(7) of the fixed member(2). Thus, attains the locking position(6) of the top arm(1 ) in the textile spinning machines.

Figure- 4 referring to a new method of load released position by unlocking its third member(4) and its schematic view for the top arm(1 ) in the textile yarn spinning machine. This figure clearly reveals that, the third member(4) is raised from locked condition(6) to the lifted positiona l ), the additional pin(9) moves from position(C) through the profile(7) and reaches the lowest position(A) in the fixed member(2).

For unlocking the top arm(1 ) from its loaded position, the third member(4) is raised to its lifted positiona l ) manually by a hand. Though, by the movement of third member(4), the additional pin(9), which is at an end of it, will moves. When the third member(4) reaches its lifted positiona l ), the additional pin(9) on other end, reaches the lowest position(A) through the profile(7) in the fixed member(2). The third member(4) is released from the second member(3), which confirms the unlock or load released condition of the top arm(1 ) in the textile spinning machine.

Figure- 5 illustrates a new method of unlocking position for top arm(1 ) with its second member(3) kept at the higher position(5) and its schematic view in the textile yarn spinning machine. The third member(4) is further raised to the highest positiona l a), the second member(3) reaches higher position(5) until the additional pin(9) rests on the position(B).

The third member(4) pivotally arranged by a pivot pin(12) on the second member(3) and has an additional pin(9) fixed at an end. The third member(4) is further raised manually so as to keep the second member(3) to the higher position(5), which bears the plurality of top rollers. Furthermore, while lifting the third member(4), the additional pin(9) is too raised from the lower end of the profile(7) from position(A) of the fixed member(2). As the third member(4) is pivotally attached to the second member(3), the second member(3) also raised along by the lifting of third member(4).

The profile(7) on the fixed member(2) provides the constructive movement to the third member(4) and its additional pin(9). After reaching a particular highest positiona l a) of the third member(4), the pin(9) rests in a groove(8) at position(B) in the profile(7) of the fixed member(2). As well as, the second member(3) also rests at its higher position(5). A spring(10) affixed from the fixed member(2), presses the pin(9) in the groove(8), so that the pin(9) can be released from the cavity only by applying mere force to the third member(4). Thus, by the application of force by single hand to the third member(4), the pin(9) slides back and rests at its original position(C) and at the same time, top arm(1 ) rest towards locking position(6) or top arm(1 ) loading position. This simple cycle continuous for every locking and unlocking position of the top arm(1 ) of the textile spinning machine.

Claims

WE CLAIM :

1 . An improved top arm for textile machine having linkage mechanism for locking and unlocking operation, wherein said mechanism comprises a fixed member(2) provided with at least a groove(8) to receive an additional pin(9).

2. An improved top arm for textile machine as claimed in claim 1 , wherein said linkage mechanism comprises fixed member(2), second member(3) and third member(4).

3. An improved top arm for textile machine as claimed in claim 2, wherein said second member(3) bears the plurality of top rollers at one end and pivoted to the fixed member(2) on its another end.

4. An improved top arm for textile machine as claimed in claim 2, wherein said third member(4) pivotally arranged by a pivot pin(12) on the second member(3), has an additional pin(9) fixed at an end.

5. An improved top arm for textile machine as claimed in claim 4, wherein said third member(4) and the second member(3) operatively connected with fixed member(2) between locking and unlocking position.

6. An improved top arm for textile machine as claimed in claim 5, wherein while the third member(4) is raised from locked position(6) to the lifted positiona l ), the additional pin(9) moves from position(C) through the profile(7) and reaches the lowest position (A) in the fixed member(2).

7. An improved top arm for textile machine as claimed in claim 6, wherein while the third member(4) is further raised to the highest positiona l a), the second member(3) reaches higher position(5) until the additional pin(9) rests on the position(B).

8. An improved top arm for textile machine as claimed in claim 2, wherein said linkage mechanism has a spring(10) affixed from the fixed member(2), presses the pin(9) in the groove(8).