US1760745A - Mechanism for drawing textile roving - Google Patents

Description

Filed Aug. l2, 1929 2 Sheets-Sheet l nvenr rmmda wsaZancas' UZZZZ; rneqys.

May 27, 1930.r F. cA'sABLANcAs 1,760,745

MECHANISM FOR DRAWING TEXTILE ROVNG Filed Aug. 12, 1929 {Sheets-sheet 2 Patented y 27, i930 UTED FERNANDO-CASABLANCAS, F SABADELL, SPAIN MECHANISIVI FR DRAWING TEXTILE ROVING Application led August 12, 1929, Serial No. 385407, and-in Spain October 19, 1928..

This invention relates to improvements in drawing mechanisms for textile roving, which consist in a special arrangement of the members employed for exerting pressure on the top rollers.

In the usual drawing mechanisms, constitutedby three or more pairs of rollers, as well as in mechanisms with a great draft in which the rovineis guided, by means of a pair of endless 2belts or bands or by other means, from the intermediate pair of rollers to the drawing rollers, there is an increasing tendency to load by means of weights all'the top rollers instead of loading only those ofthe front pairs of the mechanism.

The saddles or pressure parts hitherto used for weighting the top rollers, have drawbacks and present diiliculties in fitting, and l more particularly they have the drawback 2Q that it is not easy to withdraw the rear roller or top feed roller without dismantling the pressure mechanism. `This rear roller is moreover the one which in practice it is advisable to withdraw most frequently, particularly in mechanisms with great draft with belts or straps, for facilitating the introduction of the roving.

This invention relates to a saddle or-pres- Ysure member for exerting pressure on the pairs of rear rollers of the drawingmechanism or on all of them, which in addition to combining special conditions enabling it to be adaptedv to varying distances between the pairs of rollers, has the special advantage of facilitating the withdrawal of the upper feed roller and the replacing thereof in position withoit dismantling the pressure mechanism and without interrupting in any way the working of the drawing mechanism.

This saddle or pressure member hasa principal part which exerts pressure on the two rear rollers of the drawing'v mechanism, and is fitted by means of a concave bearing to the neck of the intermediate top roller and by means of a straight branch or arm to the neck of the rear roller so that it becomes possible to vary at will thedistance between the two pairs of rear rollers. VThis saddle has moreover a straight extension, directed rearwardly, which is situatedabove the bottom l rear roller and in close proximity thereto, in

member which acts on the front pair when a mechanism with three pairs of rollers is under consideration, or on the two front palrswhen it is a question of a mechanism with four pairs. .The front pressure part is connected to the rear part by means of a rod permanently secured to the front part and passing loosely through a hole in the rear part. This makes it possible to vary at will the distance between the pairs of rear rollers and the front pair or pairs, the two parts-the front and rear one-of the saddle remaining neverthe less coupled together, avoiding any possibility of uncoupling, so. that asingle tie rod which is pivoted preferably to the rear of the front part of the saddle,is suflicient to transmit the action of the weight to all the top rollers of the mechanism.

In the accompanying drawing are shown various examples of drawing mechanisms according to the invention. To simplify the drawings, only the parts of the drawing mechanism which are necessary to an understanding of the invention are shown.

Figure 1 shows in cross section a mechanism with great draft for a spinning frame with three pairs of rollers, the intermediate pair of which has belts orstraps for guiding the roving and is provlded with a pressure part which acts simultaneously on all the rollers.

Figure 2 shows a drawing mechanism wlth four pairs of rollers with a pressure p art which acts simultaneously on the four pairs.

Figure 3 shows a modified construction in which the pressure part acts only on the two rear rollers, the front roller being weighted independently. U

The apparatus shown 1n Flgure'l, comprises a pair of feed rollers 1, 2, a pair of inpassed the two endless'belts 7, 8 guided by the frame 9 in a manner already known. The three pairs of rollers are supported in the usual manner by means of supports and bearings not shown in the drawing.

According to this invention, the mechanism comprises a saddle or pressure part which transmits pressure simultaneously to the three top rollers,.the said saddle being constituted by two essential parts which are identiied jointly by the number 10 for the front part, and by the number 11 for the rear part. The part 10 is provided at its front end with the concave bearing or part 12 adapted to bear on the neck of the top roller 5, and at its rear end with a rod 13permanently secured to it and constituting the connection between the two parts 10, 11 of the pressure part. The rear part 11 is provided with a hole 1'4 through which passes the rod 13, and forms at its front end a bearing 15 intended -to engage with the neck of the intermediate roller 3, and at vthe rear end a straight flat branch 16 which engages with the neck yof the roller 1. The hole 14 is slightly larger in diameter than the rod 13 and is moreover reamered out towards one of its sides so that it allows of a free movement of the part 11 relatively to the part 10. Owing to this arrangement the apparatus can be fitted to the drawing mechanism whatever may be the distance between the intermediate rollers 3, 4 and the drawing rollers 5, 6 and in a similar manner, owing t0 the rear arm 16 being straight the apparatus allows of any desired suitable distance between the feed rollers 1, 2 and the intermediate rollers 3, 4.

Moreover, the part 11 of this saddle has a` lower branch or arm 17 which extends below the neck of the roller 1 and is situated above, and at a very small distance-from the neck of the roller 2. Owing to this arrangement, when the roller 1 is withdrawn, the said branch 17 presses against the bottom roller, the pressure part remaining approximately in the same position shown in the drawing, without the pressure mechanism becoming deranged or falling to pieces, and, what is still more important, without the position of the pressure part, and therefore the distribution of pressure of the other top rollers,

being materially altered, so that they con'-` tiiiue to workin normal manner. Y

To facilitate the operation of withdrawing and replacing the top roller 1, the branch 16 is raised in its rear part and forms an inclined plane 18 in such a manner that in order to withdraw the roller, it is merely necessary to raise it together with the pressure member to an extent suiiicient to disengage its journals or necks from the grooves of the supports, and then the very action 'of the inclined plane 18 of the arm or branch forces the roller 1 towards the rear, that is to say, towards the right in thev drawing, the

pressure member remaining pressed by the bottom branch 17'against the roller 2. To replace the roller 1, it is suiiicient to engage the same with the bearing and'to push it forwardly that is to say towards the left in the drawing, owing to which, the neck of this 'zos roller 1 acting on the inclined plane 18, will raise the pressure member to an extent suiil cient to enable the roller to travel on the bearing or support and to engage with its journals with the corresponding grooves, the apparatus then again occupying the position shown in the drawing.'

To transmit the action of the weight to the said saddle or pressure member, to the part 10 is pivoted at its rear by means of a of the weight 31 has a tendency to turn the lever 22 about the point of support of its end 24 and to raise its other end which 1s engaged in the ring 23 so that it cannot be-ly come disengaged from the latter.

The front part 10 of the pressure mechanism has a branch or arm 25 directed upwardly which is used to support the cleaning roller 26 and is extended and forms a handle 27 which enables the pressure mechanism to be raised in order to withdraw the front roller 5 when necessary. At its rear, this part 10 is provided with another extension 28 which is intended .to hold the cleaning roller 26-in the rear position 260 when necessary.

In Figure 2 is shown the arrangement oi the pressure part applied to a drawing mechanism with four pairs of rollers. The mechanism comprises the two pairs of rear rollers 1, 2, 3, 4 on which presses the part 11 exactly in the same way as has been explained with reference to Figure 1, and this mechanism comprises moreover two front pairs of rollers 33, 34, 5, 6, on which presses the front part 35 of the pressure mechanism which in this case is slightly modified and is provided at its lower part, with a lever 37 pivoted about a pin 36 which with one of its ends presses on the front roller 5 and with its other end presses on the intermediate roller 33. To the front part 35 is pivoted at the point 20, 1n the same way as has been described with reference to Figure 1, the tie rod 21 which is threaded the rear part 11. p i

Figure 3 shows a modified construction in which the pair of front rollers 5, 6 are weight ed by means of a weight independently of that which acts on the rear rollers l, 2, 3, 4. To this end, the part 11' is arranged in the same way as alreadystated, with the exception that it is not provided with a hole for fitting it to the rod 13. In place of the hole, to the said part ll is pivoted at a point 38, the rod 2l which transmits the action of the weight the pressure of which is distributed by the part l1 exclusively on the top roller 3 and on the top roller 1, whilst the top roller 5 is weighted in a manner already known by means of a rod 39 arranged at the front part of the mechanism.

I claim 1. In a drawing mechanism for textile rovings, the arrangement of a pressure member which rests on the two rear pairs of rollers, means for transmitting to said pressure member the action of a Weight to charge the said cylinders, said pressure member forming at its anterior end a bearing by which it bears on the pair of intermediate rollers and at its rear two branches, the upper branch pressing on the top feed roller and the lower branch remaining over the neck of the bottom feed roller and at a short distance from it.

2. In a drawing mechanism for textile rovings, the arrangement of a pressure member which presses on the two rear pairs of rollers; a bearing at the front part of said member adapted to bear on the intermediate pair of rollers, an upper lbranch at the rear part of said pressure member and in a backward direction, forming a straight part arallel to the direction of the libres, and in continuity of it an inclined part forming an angle with the former, said straight part servingto be applied on to the top feed roller while the mechanism is working, and said inclined part to be applied against this same roller at the moments when the roller is withdrawn or replaced in position, and a lower branch which remains at a very shortI distance from the neck of the bottom feed roller,

v with the object that when the top feed roller CII vWith is withdrawn the pressure member remains resting by the lower branch on the neck of the bottom roller in an approximately normal position, without disturbing the pressure mechanism and without interfering with the normal working of the other rollers of the machine.

3. In a drawing mechanism for textile rovings, the combination of a pressure member which bears on the two rear pairs of rollers a second pressure member which charges the front rollers, said second pressure member being provided with a rod with a rearward direction, which is passed into a hole of the rear pressure member, so that both members are coupled together and form one single pressure part which charges all the FERNANDO CASABLANCAS.

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