Patent GB-987129-A (GB)
Title: Improvements in or relating to top roll carrier and weighting arms for textile drafting machines
IPC: D01H5/50
Filed: 1962-05-11
Abstract: 987,129. Drafting-apparatus. SKF KUGELLAGERFABRIKEN G.m.b.H. May 11,1962 [May 13, 1961], No. 18258/62. Heading D1D. In a pivotally mounted arm for carrying and loading the top rolls of drafting-apparatus, at least one of the top rolls has weighting pressure applied by pressure-fluid means and at least one of the top rolls has weighting pressure applied by mechanical means. In Fig. 1,a hollow weighting- arm 2 houses a flexible container 3 and plates 15, 16, 17, one for each roll to be loaded, between its base and the container. Each roll is carried by a guide-arm 21 pivoted at 22 to a pair of numbers 23 depending from the base,and springs 18, 19, 20 pass through a slot in the base to be disposed between the arms and the plates. The springs are of different strengths and may have a non-linear relationship between load and compression;accordingly when pressure-fluid is admitted by a valve 5, the plate 16 corresponding to the middle roll, which may be an apron roll, is forced on its seating before the others, so that thereafter the load on the roller is independent of any further rise of pressure in the container 3. One plate 17 corresponding to the back roller 10 is next to be seated. To lock the arm in position, a further plate 28 is secured to a spring-urged plunger 26 adapted to be forced into a recess 24 on a ring 25 fixed to the supporting bar 1. The pressure in the container can be achieved by cutting off the pressure in line 4 and setting the valve to vent the pressure through ports at 7. The plates may be flat or curved. In Fig. 9, plates 31, 32 are fixed in depending members 23 and carry pivot-pins for guide-arms 21. For the middle and back rolls there are springs between the plate 32 and the arms: for the deliveryroller 8 there is a plunger 30 extending through apertures in the plate and the base of the arm and secured to a plate 15 subject to the pressure in the container. The arm is locked by a lever 38 carrying a member 37 engageable with an abutment on a ring 25, the lever co-operatingwith the valve-handle 6 so that when the lever is released it moves the handle 6 to relieve the pressure in the container. In Fig. 13,a pressure-line 40 communicates with a container 43 in a box 42 open at its left-hand end. A U-shaped member 41 engages the container at its left-hand end, and has sidecheeks carrying a pivot 44 for a guide-arm 21<SP>1</SP> and slidable in response to pressure in the container upon the side-walls of a further U-member 45 fixed to the arm 2 and carrying a pin 22<SP>1</SP>. Thus, as the pressure rises, the pivot 44 moves to the left and the guide-arm 21<SP>1</SP> turns about the pin 22<SP>1</SP> to load the roll. The other top rolls are loaded by springs e.g. 19 between the upper side of a U- member 46 and a guide arm, the side walls of the member 46 carrying a pivot 22 for the guide arm and being secured to the base of the arm 2<SP>1</SP> at 50. The arm may be converted into one where the roll 9 e.g. is loaded by fluid pressure. To this end, a cover 47 is removed the parts for loading the rolls 8, 9 are slid out and those for roll 9 replaced by an arrangement similar to that shown for roll 8. Roll 9 and its loading-parts are then replaced. Means are also described for converting the fluid pressure loading means of Fig. 9 into spring-loading means.