US2339513A - Weighting mechanism for the drawing rollers of combing machines and other machines for the treatment of textile fibers - Google Patents

Description

Jan. 18, 1944. PlERREPONT' 2,339,513

wmemme MECHANISM FOR THE DRAWING ROLLERS OF COMBING MACHINES LE FIBERS AND OTHER MACHINES FOR THE TREATMENT OF TEXTI Filed May 8, 1943 4 Sheets-Shae} 1 Cam. owxkladh JanQlS, 1944. o. .PIERREPONT 2,

WEIGHTING MECHANISM FOR THE DRAWING ROLLERS OF COMBINGMACHINES AND OTHER MACHINES FOR THE TREATMENT OF TEXTILE FIBERS Filed May 8, 1943 4 Sheets-Sheet 2 ow, nus 1......

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Jan. 18, 1944. D. PIERREPONT 2,339,513 WEIGHTING MECHANISM FOR THE DRAWING ROLLERS OF COMBING' MACHINES AND OTHER MACHINES FOR THE TREATMENT OF TEXTILE FIBERS Filed May 8, 1943 4 Sheets-Sheet'3 .Zizpizk mm a, o pkmrm Jan. 18, .1944. D. PIERREPQNT. 2,339,513

wsmawme MECHANISM FOR THE DRAWING nommns 0F comma MACHINES AND OTHER MACHINES FOR THE'TREATMENT OF TEXTILE FIBERS Fileq'May 8, 1943 4 Sheets-Sheet 4 2/ ZIQr 6 K I- 22 20 6 "/Wum/z; QMMQW Patented Jan. 18, 1944 WEIGHTING MECHANISM FOR THE DRAW- ING ROLLERS OF COMBING MACHINES AND OTHER MACHINES FOR THE TREAT- MENT 9F TEXTILE FIBERS Donald Pierrepont, Chadderton, Oldham, England Application May 8, 1943, Serial No. 486,148 In Great Britain April 24, 1942 4 Claims.

This invention of improvements in or relating to weighting mechanism for the drawing rollers of combing machines and other machines for the treatment of textile fibers refers more particularly to mechanism for quickly relieving, and re-applying, weight to the covered top rollers of the drawing-head of a machine of the kind referred to.

Itis well known in connection with the weight ing of drawing rollers, especially where the top rollers are leather covered, that it is desirable, when the machine is stopped for any considerable length of time, that the top rollers should be relieved of the influence of the weights to avoid the formation of flats on the covering of said top rollers.

Various means for accomplishing this purpose have been proposed, some operated by rotation of a screw by means of handwheel and others by movement of a lever, usually through a relatively large angle, thus occupying an appreciable amount of the time of an operative. If the operative be careless, or, as often as not, is in a. hurry to get this part of the work over, the unweighting is sometimes not properly performed, with consequent risk of damage to the top rollers.

A further disadvantage experienced with some known weight-relieving mechanisms is that when the weighting hooks are removed from the arbors of a top roller in order that said top roller may be lifted out for cleaning or changing, there is a tendency for the weight wires to fall out of position and sometimes to be not readily accessible for replacement.

This invention contemplates the provision of mechanism which permits the Weight to be lifted from the top rollers of a drawing-head sufliciently to prevent the formation of flats on the top rollers, and reapplication of said weight, with a minimum of efforton the part of the operative, which also permits the top rollers to be quickly relieved of their weight by a further slight effort on the part of the operative so that said rollers can be lifted out for cleaning or changing, and further, which prevents the rollers from being unweighted whilst the machine is running and alternatively prevents the machine from being set in motion if the rollers are unweighted. A still further feature is that the weighting, hooks from which the weights are suspended are so arranged that when lifted from the rollers they are retained in a conveniently accessible position in the machine, whereby to facilitate the reweighting of the top rollers.

Mechanism according to the invention, and particularly as applied to the draw-head of a combing machine for combing textile fibers, incorporating a group of top and bottom rollers, includes a set of independent weights threaded on to weighting hooks for suspension from the top rollers of said draw-head, a bridge piece penetrating said weights in a direction at rightangles to the axes of said top rollers, said bridge piece being carried between bearing brackets secured to the frame of the machine, with freedom for limited up and down movement between said brackets, a shaft journalled in said brackets in parallelism with said bridge piece, a cam fast on said shaft, at least one lobe of said cam being higher than the other or others, a handle on said shaft whereby said shaft maybe turned about its axis, within limits, a finger or bolt pivotally mounted on the boss of on of said bearing brackets, whereby, when the machine is running, turning of the handleto relieve the weighting of the top rollers is prevented by the obstruction of said bolt by the setting-on rod of the machine, but, when the machine is stopped,

turning of said handle to relieve the weighting of the top rollers is permitted, as the projecting bolt is then free to slide in a groove in said setting-on rod which is brought into the path of movement of said bolt when the said rod is operated to stop the machine, the engagement of said bolt with said rod preventing endwise movement of said rod to start the machine.

An embodiment of the invention will now be described with the aid of the accompanying drawings in which Fig. l is a fragmentary side elevation of a draw-head of a combing machine with Weight-relieving mechanism according to the invention applied thereto; Fig. 2 is a fragmentary side view of weight-relieving mechanism shown in Fig. 1; Fig. 3 is a plan View of a detail part, later to be referred to; the parts in the foregoing figures being assumed to be in the position occupied when the combing machine is running; Figs. 4 and 5 are similar views to Figs. 2 and 3, but in this case the combin machine is assumed to be stopped and the weightrelieving mechanism moved to a first lift position to relieve the top-rollers of the weight while also preventing the machine from being restarted, the top rollers, however, being incapable of removal from the roller stands; Figs. 6 and '7 are similar views to Figs. 4 and 5, but with the weight-relieving mechanism moved to a second lift position to free the top rollers and permit of their removal from the roller stands while still preventing the machine from being set in motion.

The same reference characters indicate corresponding parts in the several figures of the drawings which show only so much of a combing machine as is necessary for a clear understanding of the invention.

Referring to Fig. 1, which shows in side elevation a draw-box head of a combing machine, II] indicates the frame of the machine, II the roller stands, and I2, I3 the top and bottom drawing rollers. There is provided below the drawhead a short shaft I4, hereinafter referred to as a cam-shaft, journalled in bearings in a pair of spaced brackets I5, I6 carried by the frame I0.

Fixed on the cam-shaft I4 is a cam ll of an axial dimension slightly less than the distance between the adjacent faces of the bearing brackets I5, I6. The cam I1 is formed with three lobes I8, I9, 20, providing cam rises extending longitudinally of said cam, the central lobe' I9 projecting further from the axis of the cam shaft -I4 than the outer lobes I 8, 20, see Figs. 2, 4 and '6. Although only the centrallobe I9 and the outer lobe IB are used in the arrangement shown in the drawings, the second outer lobe 26 is provided to obviate the need for right and lefthanded cams. Mounted for vertical sliding movement within the bearing brackets I5, I6 and in .close proximity to the cam I1 is a bridgepiece 2I the under side of which is formed with a cam surface 2Ia while the top side presents a plane surface 2I b which in one condition of use affords bearing for a set of weights 22 each having an orifice 22a enabling said weights to be threaded over the bridge-piece 2 I, the cam shaft I4 and the cam I1, and located between the bearing brackets I5, I6. When the machine is working, the-bridge-piece 2I rests by its ends 2Ic, 2Id on the bosses Ia, Hill of the respective bearing brackets I5, I6, see Figs. 1 and 2, the upper part of each of said bosses being formed with a flat to receive the bridge-piece 2 I.

There is a weight 22 for each top roller l2 to be weighted, and each weight 22 is suspended by a pair of hooks23 from the arbors of the respective top roller I2 in known manner. Each weight/22 isnarrow in relation to its depth, and in each narrow side adjacent to the top of the weight there is formed an open-ended groove or recess 22b whereby in effect lugs 220 are provided on opposite sides of the weight 22. The lower ends of the weighting hooks 23 penetrate holes in the lugs 22c and are screw-threaded and provided with washers 24 and nuts 25 to secure the weights on the hooks. When the hooks 23 are lifted from the arbors of the top rollers I2, the lower ends of said hooks, where they project through the lugs 22c, come into contact with shoulders 22d formed by the floors of the respective .recesses 22b, whereby undesirable movement of the hooks 23 is restrained and the hooks 23 are held in accessible position, thus facilitatlng.the replacement of the hooks 23 in the reweighting" of the top rollers I2.

The cam-shaft I I projects at one end through the boss I5a of the bracket I5 and is there fitted witha stop 26a adapted to abut against a stop IS?) on the boss I5aof the bracket I5 to limit the forward movement of the handle 26. Similar stop s26b; I50 respectively, are also provided for use forthe same purpose with a machine of opposite hand.

fPivOtally connected to a lug I5d projecting from the boss a of the bracket I5 is a finger or bolt 21 extending in an upwardly inclined direction with its free end penetrating a hole in a guide bracket 28 secured to the outer face of the bearing bracket I5. The guide bracket 28 also affords a bearing for the usual setting-on rod 29 of the machine which has on its underside a notch 29a wide enough to allow entry of the bolt 21 therein.

In one position of use the notch 29a is in the path of movement of the bolt 21, while in another position of use the setting-on rod 29 interferes with the movement of the bolt 21.

The operation of the apparatus is as follows:

Assuming that the weighting is correctly applied to the top rollers I2, i. e., the weights 22 are suspended from the arbors of the top rollers I2 by means of the weighting hooks 23 and are clear of the bridge 2 I, and the machine is working, the position of the handle 26 on the camshaft I4 will be vertically downwards i. e., at six oclock, and the setting-on rod 29 will be in a position which prevents the bolt 21 from sliding through the guide bracket 28, see Figs. 2 and 3, and, consequently, the handle 26 is held against movement to relieve the weighing on the rollers. When the machine is stopped, the setting-on rod is in a position where the notch 29a in the underside of the setting-on rod 29 is in register with the hole in the guide bracket 28 through which the bolt 21 slides, and consequently there is free passage for the bolt 21 through the bracket 28, see Figs. 4 and 5.

If it is desired to release the weight from the top rollers I2 to obviate the formation of flats on the top rollers during a prolonged stoppage of the machine, then the handle 26 is moved approximately to seven oclock position whereby the cam shaft I4 is given a partial rotation, whereupon one ofthe outer lobes, e. g., the lobe IB, is caused to bear against and move the bridgepiece 2| vertically upwards to lift simultaneously all the weights 22 just sufficiently to relieve the weighting on the top rollers I2, see Fig. 5. This movement of the handle 26 is so slight that it entails very little effort on the part of the operative to relieve the weighting instantly.

This movement of the handle 26 causes the bolt 21 to be slid through the guide bracket 26 into engagement with the notch 29a in the setting-on rod 29, see Figs. 4 and 5, thereby preventing endwise movement of the rod 29 and consequently rendering it impossible for the machin to be restarted while the top rollers I2 are unweighted.

If, however, it is desired to remove one or more of the top rollers I2 for clearing or for change of the rollers, the handle 26 is moved to a position approximating to nine oclock, thus turning the cam-shaft I4 and causing the central lobe IQ of the cam I! to press against and lift the bridge piece 2|, and the weights 22, now sustained by said bridge piece 2 I, to a greater extent, see Fig. 6, so that the weighting hooks 23 may be lifted clear of the arbors of the top rollers I2 to permit said rollers to be easily removed. Undesirable downward movement of the weighting hooks 23 is restricted by the bottom ends of the hooks 23 abutting against the shoulders 22d formed by the floors of the recesses 22b in the weights 22, whereby the weighting hooks are retained in conveniently accessible position. The bolt 27 projects further through the guide bracket 26, but still engages the notch 29a in the setting-on rod 29, see Fig. 7, to prevent endwise movement of the rod 29. The movement of the handle 26 is restricted in this direction by the stop 26a on the handle 26 abutting against the stop b on the adjacent bearing bracket I5, see Fig. 6.

When the weighting is to be applied to the top rollers E2, the weighting hooks 23 are replaced in position over the arbors of the top rollers l2 and the handle is returned to initial position, whereupon the turning of the cam-shaft l4 and cam ll permits the bridge piece 2! to fall by gravity until the weights 22 are again free of the bridge piece 2i and suspended on the weighting hooks 23 from the top rollers l2. On the completion of this movement the bolt 21 is withdrawn from engagement with the notch Eda in the setting-on rod 29 which is thus made free t be moved to start the machine.

Movement of the handle 26 to relieve the weighting while the machine is in motion is prevented, as the setting-on rod 29 is in the path of movement of the bolt 21, thus rendering it impossible to move the handle 26, see Figs. 2 and 3.

It will be seen from the foregoing description that the operation of relieving the weighting of the top rollers of a draw-box can be efiected quickly with a minimum of effort on the part of an operative, and as easily re-applied, and that, when the weighting is off the rollers, the machine cannot be restarted until the weighting has been restored.

Further, the top rollers cannot be unweighted while the machine is running.

What is claimed is:

1. In a draw-head for combing machines and other machines for the treatment of textile fibres, incorporating a group of top and bottom rollers, weighting mechanism for said rollers, including fixed bearing brackets, a set of individual weights, on for each top roller, weighting hooks for suspension of said weights from the top rollers, a bridge-piece penetrating said weights in a direction at right angles to the axes of said top rollers, said bridge-piece being carried, with freedom for structed by the setting-on rod when the machine is running, whereby to prevent turning of said handle to turn said cam and relieve the weighting on the top rollers and, when the machin is stopped, being free to be slid into engagement with said groove, whereby to prevent endwise movement of said setting-on rod to start the machine.

2. Weighting mechanism for the drawing rollers of combing machines and other machines for the treatment of textile fibers as claimed in claim 1 in which the cam lobes ar so devised that a slight initial turning movement of the handle suifl'lces to release the weighting of the top rollers, and continued turning movement of said handle effects complete release of the top rollers.

3. Weighting mechanism as claimed in claim 1 in which the cam is reversible and formed with three lobes providing cam rises extending longitudinally of said cam, the central lobe projecting further from the axis of the cam-shaft than the outer lobes.

4. Weighting mechanism as claimed in claim 1, in which each weight is narrow in relation to its depth and is formed in each narrow side adjacent to the top of the weight with an open-ended recess whereby to provide lugs on each side of the weight adapted for penetration by th lower ends of the weighting hooks.

DONALD PIERREPONT.

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