Title of Invention

A DEVICE FOR TILTING TROUGHS FOR DOFFING IN A FLYER SPINNING MACHINE

Abstract

This invention relates to a device for tilting troughs for doffing during spinning operations. Troughs are drivably connected and are alignable with guide wheels provided on guide slots. These slots run parallel to each other up to a point. One of the guide slots in each pair is inclined towards the other after this point. The trough travelling vertically up to this point rotates and tilts because of this inclination. This tilting enables the operator to handle the doffing and donning of troughs easily.

Full Text

This invention relates to a device for tilting troughs for doffing in a flyer spinning machine. Doffing is a process of removing full cops or other yarn packages from a spinning machine. After every cycle of roving operation in a flyer spinning machine, the loaded bobbins are to be removed and empty ones are placed for the next cycle of spinning. These processes are known as doffing and donning steps and are termed collectively as doffing process. Doffing is a time consuming process. Conventionally, operatives remove the cops from the trough manually. The age of automation brought in many improvements. Automatic tilting of individual bobbins or troughs towards the operatives were tried to enable the operatives to work with ease and reduce the doffing time considerably. Another improvement is in tilting the trough pneumatically when the roving cycle is completed and the trough travels below the flyer. A separate tilting arrangement is found expensive, adding to the overall cost of the process and the final product. Any failure in the pneumatic system for tilting would also affect the performance and therefore the quality of the fibre production. One of the objectives of this invention has been to develop a tilting arrangement for troughs, which is safe and less costly than the known pneumatic tilting device. In flyer spinning machines, troughs are connected to a carriage shaft through ropes or metal chains to drive them vertically. Guide brackets are provided on the side walls of the frame. A plurality of guide slots having guide wheels are provided on the guide bracket and these guide slots run parallel to each other. These guide slots form a guide path for the up and down movement of the trough by the carriage shaft during spinning operation. The guide wheels are located on the guide path of the trough and each trough is held straight during the upward and downward movement. The guide wheels are arranged at a predetermined distance on a diagonal path perpendicular to the trough base and the guide slots are located at a predetermined distance on the diagonal path to correspond to the diagonal path the guide wheels. At least one of the guide paths in the guide slots terminates in an inclined position, the angle of inclination being towards the corresponding opposite guide path in the slot. From this point, the guide path on the guide slots are not parallel to each other but are inclined towards the other. The carriage shaft drives the trough vertically through the guide paths where they are parallel to each other. When the roving process is over, the shaft drives the trough down below this parallel limit and the guide wheels enter the guide path where one guide slot is inclined disposed. Due to this inclination, guide wheels at the base of the trough changes the direction of movement from vertical to diagonal. The oppositely disposed guide slot tends to continue and maintain the trough movement vertically and this causes slight rotation resulting in a tilt of the trough from vertical. The direction of the tilt may depend on direction of the inclination and which of the guide slots is inclined. It is found advantageous to modify the slot on the back with a forward inclination. This enables easy withdrawal of the trough from the assembly. Accordingly this invention relates to a device for tilting troughs for doffing in a flyer spinning machine which comprises drivable troughs, a guide bracket provided with at least one pair of guide slots having guiding wheels alienable with the base of the said trough when driven, the said guide slots running parallel to one another up to a point, and at least one guide slot being inclined to the other thereafter to rotate and tilt the vertically traveling trough at that point. This invention will now be described with reference to the figures in the accompanying drawings. Fig.I shows the sectional view of the device. Reference numeral (U)indicates the trough and numeralC2^shows the base of the trough. Reference numerals sliindicates a roller shaft while (9) indicates the roller and (lo) indicates the chain connected to the trough on one side while the other side has a dead load. Guide bracket is indicated by numeral Cs). Reference numerals (ej and (7) show the side walls and the guide slots provided therein. Guide wheels indicated by (3)and (4) are located in the guide slots and align with the base of the trough during operation. The shaft connected to the trough drives it up and down vertically. The inclined portion of one of the guide slots is marked by the letter l) Fig.II illustrates the normal movement of the trough during operation when it is driven by the shaft up to the point before the inclination starts. Fig.III shows the troughs in an inclined position when it travels beyond the limits of the slots which are parallel to each other. The tilted position of the trough facilitates easy doffing there from. Though the invention has been described hereinabove with a specific embodiment, obvious alterations and modifications known to persons skilled in the art are within its scope and that of the appended claims. WE CLAIM : 1. A device for tilting troughs for doffing in a flyer spinning machine comprising drivable troughs (1), a guide bracket (5) provided with at least one pair of guide slots (7) having guiding wheels (3, 4) alignable with the base of the said trough when driven, the said guide slots (7) running parallel to one another up to a point, and at least one guide slot being inclined to the other thereafter to rotate and tilt the vertically traveling trough at that point. 2. The device as claimed in claim 1, wherein the trough (1) is drivably connected to a shaft (8) and roller (9) assembly. 3. The device as claimed in claims 1 and 2, wherein the trough (1) is vertically driven up and down by the shaft during spinning operation. 4. The device as claimed in any of the above claims wherein the guide slots (7) are at a predetermined distance diagonal to the path of the guiding wheels. 5. The device as claimed in any of the preceding claims, wherein the guide slot (7) at the back of the side wall is forwardly inclined to the slot in front thereof. 6. The device as claimed in any of the preceding claims wherein the side walls (6) are provided with a plurality of guide slots to correspond with the number of troughs in the spinning machine. 7. A device for tilting troughs for doffing in a flyer spinning machine, substantially as herein described with particular reference to the figures in the accompanying drawings.

Documents:

1906-mas-1997 abstract-duplicate.pdf

1906-mas-1997 abstract.pdf

1906-mas-1997 claims-duplicate.pdf

1906-mas-1997 claims.pdf

1906-mas-1997 correspondence-others.pdf

1906-mas-1997 correspondence-po.pdf

1906-mas-1997 description(complete)-duplicate.pdf

1906-mas-1997 description(complete).pdf

1906-mas-1997 drawings-duplicate.pdf

1906-mas-1997 drawings.pdf

1906-mas-1997 form-1.pdf

1906-mas-1997 form-19.pdf

1906-mas-1997 form-26.pdf