FIELD OF THE INVENTION

This invention pertains to a spinning machine, more particularly ring spinning and twisting machines to provide a driving arrangement for tilting the lappet rod during the doffing cycle.

BACKGROUND OF THE PRIOR ART

A ring spinning machine generally comprises, on each side of the machine frame, a plurality of rails which must vertically displace with an oscillating movement as the yarn is distributed along the bobbin core of the bobbin on which the yarn is wound. These rails can include lappet rod fitted with the thread guide also known as lappet, which is pivotally mounted on the machine frame usually disposed along the axis of the spindle. The thread guide is provided with an eye portion to guide the yarn and below the eye portion there is normally a balloon controller, which is likewise a member guiding the yarn and is mounted on another rail, which customarily is moved up and down in an oscillating motion. The ring fitted with ring traveler may likewise be provided on another rail, so-called ring rail which is vertically reciprocated. The movement of the individual rails for the thread-guide eye, the balloon-control ring and the ring must be controlled with precision and dependent upon the spinning laws which apply for the formation of the cops.

When the conical tubes are filled up with the yarn and the cop winding takes place, soon after the pre determined length of yarn is wound on the conical tube, the formed cops need to be doffed and empty conical tubes need to be put on the spindle. During the doffing cycle, the ring rail, balloon-control ring rail and thread guide rail moves downward to the rest position. For doffing and donning purpose, the thread guide or the lappet mounted on the lappet rod has to be tilted vertically to permit the removal of the cops easily as well as to load the empty conical tube on to the spindle. After completing the doffing, again the lappet rod has to be tilted to horizontal position before restarting the machine. In the existing system, link mechanisms and plurality of rods with pneumatic cylinders are provided to carry out the tilting of lappet rod which leads to uneven load distribution, improper tilting and results in higher end breaks in the yarn during the doffing cycle which is disadvantageous.

The present invention provides a device which can overcome the above mentioned problems associated with the lappet tilting mechanism of the ring spinning and twisting machine.

OBJECTS OF THE PRESENT INVENTION

The object of the present invention is to provide an improved device for tilting the lappet rod in the ring spinning and twisting machines to provide smooth operation and distribution of load evenly to the entire length of thread guide tube arranged on both left hand side and right hand side of the machine during operation.

It is further object to provide smooth and jerk free oscillatory movement of lappet rod resulting in reduction of undesired tension and minimization of end breakage in the yarn.

SUMMARY OF INVENTION

The above objectives are accomplished according to the present invention by providing a device for tilting the lappet in a spinning and twisting machine comprising driving means adopted for providing oscillatory motion to the lappet rod assembly through gear assembly.

DESCRIPTION OF THE ACCOMPANYING DRAWINGS

Figure 1 of the drawings schematically illustrates the front view of a spinning and twisting machine fitted with lappet tilting device according to the invention.

Figure 2 of the drawings schematically illustrates the drive arrangement of the lappet tilting device according to the invention.

Figure 3 of the drawings schematically illustrates the part of enlarged view of the drive arrangement shown in figure 2.

Figure 4 of the drawings schematically illustrates the isometric view of the motor mounting arrangement of the lappet tilting device according to the invention.

Figure 5 of the drawings schematically illustrates the cross sectional view of the drive arrangement of the lappet tilting device according to the invention.

Figure 6 of the drawings schematically illustrates the cross sectional view of the links and the drive shaft assembly of the lappet tilting device according to an embodiment of the invention.

DETAILED DESCRIPTION OF INVENTION WITH REFERENCE TO DRAWINGS

Normally the lappet titling mechanism for spinning, twisting and like machines comprises an elongated carrier bar of approximately circular cross sectional shape, which may be a tubular member. The thread-guides carried by lappets are mounted on the carrier-bar extending over the entire length of the machine. The lappets are mounted by means of a hinge connection on the carrier bar, also known as lappet rod which is pivotally mounted on the machine frame.

Referring to the figure 1 of the accompanying drawings, the thread guide tube assembly (1) also known as lappet rod assembly running to the entire length and arranged on both left hand side and right hand side of the textile spinning and twisting machine comprises lappet (2) mounted on thread guide tube (3). Each section of the textile spinning and twisting machine is provided with corresponding thread guide tube assembly and connected together by suitable means. The drive end of the thread guide tube assembly (1) is operatively connected to a guide assembly (4) comprising hollow tubular potion (4a) and a connector (4b) to provide oscillatory motion to the thread guide tube assembly (1). A drive shaft assembly (5) (refer figures 4 & 5) is disposed to provide oscillatory motion to the guide assembly (4). As seen from figures 1, 2 & 4, the drive shaft assembly (5) comprises a drive shaft (5a) rotatably mounted on a housing (6) and guide piece (5b) attached to its one end. The guide piece (5b) is slidably connected to the guide assembly (4) through the connector (4b) to transmit the oscillatory motion to the guide assembly (4). The housing (6) is rigidly connected to the frame member (7). Short link (5c) is attached to the other end of the drive shaft (5a). In an embodiment of the invention, drive shaft (5a) is split into two drive shafts (5a & 5a') and connected together by a coupling means (5d) as shown in figure 6.

A gear box assembly (8) is disposed and operably connected to a driving means (9) for example an electrical brake motor as shown in figures 4 & 5. The gear box assembly (8) is rigidly fixed to the mounting bracket (10) which is mounted on the frame member (7) and rigidly fixed over the main frame (11) shown in figure 1. A gear assembly (12) is fixed to the axis of the gear box assembly (8) on the side opposite to that of the gear box side. The driving means (9) can be driven either in forward or reverse direction. A segmental gear assembly (13) comprising segment gear (13a) on its one end and an arm (13b) on its other end is shown in figures 2 & 3. The segmental gear assembly (13) is pivotally connected to the frame member (7)at pivot point (13c) such that the segment gear (13a) engage with the gear assembly (12) and the rotation of the gear assembly (12) provides oscillatory motion to the arm (13b).

The short lever (5c) and the long lever (14) are disposed to transmit the oscillatory motion to the drive shaft assembly (5) as illustrated in figures 3 & 6. One end of the short lever (5c) is mounted coaxially to drive shaft (5a) of the drive shaft assembly (5) and its other end is pivotally connected to the first end of the long lever (14) at the first pivot point (14a). The long lever (14) is disposed to pivotally connect the short lever (5c). The second end of the long lever (14) is pivotally connected to the arm (13b) of the segmental gear assembly (13) at the second pivot point (14b) as shown in figures 2 & 3.

Similar arrangement is disposed to provide oscillatory motion to the guide assembly arranged on the other side of the machine. In order to facilitate that, the guide assembly (4) arranged on both left hand side and right hand side is driven in the same direction, an intermediate gear (15) is arranged in between the gear assembly (12) and the segment gears (13a'), as illustrated in figure 2.

Similar arrangement as shown in figure 2 may also be provided in the off-end (tail end) of the machine frame in order to support the load generated in the thread guide tube or lappet rod assembly.

The driving arrangement is disposed in a symmetric manner in the gear-end of the machine frame.

This invention provides uniform load distribution to the entire length of thread guide tube arranged on both left hand side and right hand side of the machine and ensures smooth and jerk free oscillatory movement to the lappets. This results in reduction in undesired tension to the yarn thereby minimizing the end breakages.

The present invention has been described herein in detail in relation to its preferred embodiment. It is to be understood that this disclosure is illustrative and any changes, modifications and equivalent arrangements are all within the spirit and scope of the present invention.

WE CLAIM :

1. A device for tilting the lappet in a spinning and twisting machine comprising driving means adopted for providing oscillatory motion to the lappet rod assembly through gear assembly

2. A device for tilting the lappet in a spinning and twisting machine as claimed in claim 1, wherein said gear assembly is engaged with a segmental gear assembly; said segmental gear assembly is connected to a long lever; said long lever (14) is connected to a short lever (5c); said short lever is connected to the drive shaft assembly (5) thereby providing oscillatory motion to the lappet rod assembly

3. A device for tilting the lappet in a spinning and twisting machine as claimed in claims 1 and 2, wherein driving means comprising a drive shaft assembly comprises a drive shaft rotatably mounted on a housing

4. A device for tilting the lappet in a spinning and twisting machine as claimed in claim 3, wherein a guide piece is attached to one end of the drive shaft

5. A device for tilting the lappet in a spinning and twisting machine as claimed in claim 4, wherein said guide piece is slidably connected to guide assembly through a connector for transmitting oscillatory motion to said guide assembly

6. A device for tilting the lappet in a spinning and twisting machine as claimed in claim 5, wherein said guide assembly comprises hollow tubular portion and connector for providing oscillatory motion to thread guide tube assembly

7. A device for tilting the lappet in a spinning and twisting machine as claimed in any preceding claims wherein thread guide tube assembly at drive end is operatively connected to a guide assembly

8. A device for tilting the lappet in a spinning and twisting machine as claimed in claim 2, wherein segmental gear assembly comprises a segment gear pivotable at a point and connected to the drive shaft assembly through levers/links

9. A device for tilting the lappet in a spinning and twisting machine as claimed in preceding claim wherein said device is provided at both ends of the machine.

10. A device for tilting the lappet in a spinning and twisting machine substantially as herein described with reference to drawing