US2237714A - Combing machine with reciprocating feed grid for wool, cotton, and the like - Google Patents

Description

April 8, 1941.

K. J. scHMn-T 2.237.714 COMBING MAC E WITH RECIPROCA G FEEL GRID FOR L, COTTON, AND T LIKE Filed Feb. 11. 1938 Patented Apr. 8, 1941 COMBING MACHINE WITH RECIPROC'ATING FEED GRID FOR WOOL, COTTON, AND THE LIKE Earl Josef Sohmitt, Chemnitz, Germany, assignor to Sachsische Textilmaschinenfabrik vorm. Rich. Hartmann Aktiengesellschaft, Chemnitz,

Germany Application February 11, 1938, Serial 189,994 In Germany March 8, 193'? 1 Claim.

This invention relates to a combing machine with a reciprocating feeding grate for wool, cotton, silk, hemp, flax and the like. The object of the invention is to obtain an alteration in the amplitude of the relative movement of the feeding grate occurring at the closing of the nipper, in order to make it possible to increase the length of the fibre tuft to be combed.

It has become known, to mount on the driving shaft, which carries the cam disc for carrying out the feeding movement and the counter movement, a second cam disc by which to the grate, the holder comb and the feeding comb a backward movement adapted to be regulated is imparted just before or directly after the breaking of the fibre tuft. The object is to regulate the quantity of this tuft and the cleanness of the comb movement. This arrangement is complicated as it requires a second cam disc, a second double lever and so forth, whereby it is rendered difficult to survey the operative elements.

In another known construction, which serves to alter the pitch, which means to alter the length of the fibre tuft to be combed, an additional forward movement is imparted to the feeding grate and is suppressed after the combing or prior to the drawing off of the fibre tuft. With this object in view a second cam disk and a second lever are necessary, besides the cam disc for the feeding movement by which additional movement adapted to be regulated is imparted.

The invention has for its object to avoid the additional elements, which impair the observation and render difficult the attendance. With this object in view the relative movement of the feeding grate connected with the nipper is, accordin to the invention, made alterable thereby that the cam disc controlling the feeding and the counterfeeding movement of the grate by means of a lever is constructed so that the lever is liberated from the cam disc after the feeding movement and the feeding grate is pushed forward by means of a spring or similar element prior or during the closing of the nipper, the amplitude of this forward movement being adapted to be regulated by an adjustable stop. The regulation of the movement of the feeding grate is therefore independent of the means for moving the same.

Two embodiments of the invention are illustrated, by way of example, in the accompanying drawing, in which:

Fig. 1 shows the device in side elevation, the detaching of the fibre tuft being completed.

Fig. 2 is a similar view on a larger scale showing part of a modified form of construction.

The detaching device comprises, for example, two detaching cylinders 12 and an endless band a guided on the lower detaching cylinder. The nipper is designated by c, r, the feed grid by d and the cam disc for the reciprocation of the feed grid by e. The cam disc e actuates the feed grid by means of a bell-crank lever 1 which bears with a roller g on the downwardly directed arm of a two-armed lever h, the other arm of which is movably connected with the feed grid d. The roller g is adjustably mounted for varying the extent of the feeding movement. The twoarmed lever it is pivotally mounted on a shaft 17 of the nipper, that is, is coaxial therewith so that during the opening and closing of the nipper the feed grid slides as far as possible. The twoarmed lever 11. is under the influence of a tension spring k in such a manner that its downwardly directed arm bears tightly against the roller g in the bell-crank lever f. Consequently the bellcrank lever f has a tendency to press its roller 111. against the cam disc e. The lower nipper bar 1' is loosely mounted on the shaft i and pressed by a spring against a feed grid d whose upward movement is limited by a stop not shown on the drawing. The grid (1 is oscillatably mounted on the lever h at a distance from the shaft 12 and bears against the bar 1' by gravity. Whenthe lower bar 1" is depressed periodically against the action of the spring in the usual manner by the descending and ascending nipper bar 0, and as the lower nipper bar T swings up and down, the grid at slides towards and away from the extremity of the bar 1'.

During the closing of the nipper (see dotted position in Fig. 1) the feed grid slides rearwardly on the lower nipper bar. The extent of this movement is dependent upon the length of path of the nipping point of the nipper from the drawing off position to the combing position. This movement is adjustable by a stationary set screw n in order to reduce or increase Within predetermined limits the length of the fibre tuft presented by the nipper c. The relative movement of the feed grid is reduced and consequently that of the fibre tuft to be combed is increased by loosening the screw n. So that the roller m of the bell-crank lever f has sufficient clearance to attain the limiting position of the bell-crank lever, the cam disc c has a recess or depression s.

Fig. 1 shows the arrangement in the position at the end of the feeding movement which is normally followed by the additional movement. This additional movement is eliminated when the set screw 11. is screwed forward so far that the roller m of the lever 1 cannot drop into the depression .9 when the roller m leaves the race of the cam disc corresponding to the feeding movement.

To impart an additional movement to the feed grid d at the end of the feeding movement the set screw n is screwed back a distance corresponding to the extent of the additional movement. In this position the roller m of the bellcrank lever f can drop into the depression s in the cam disc e at the end of the feeding movement, resulting in the additional movement of the feed grid.

At the end of the additional forward movement of the feed grid this is swung upwards for the purpose of carrying out the counter feeding. The nipper c, r is then in its lower position in which the combing is carried out. Shortly before the end of the counter feed the combing is also finished, whereupon the nipper with the feeding device returns into its upper position. At the same time the nipper opens and again shifts the feed grid forward, that is towards the nipping point of the nipper.

In the form of construction illustrated in Fig. 2 the set screw n is on the lower arm of the bell crank lever f. In this instance it influences a lever o loosely mounted on the same axle as the bell crank lever and which carries a roller p hearing against a disc q arranged beside the cam disc e. This disc q projects beyond the periphery of the recessed portion of the cam disc e. The movement of the lever ,f is therefore limited in that the position of the lever o is altered by tightening or loosening the screw n.

I claim:

In a feeding device for Hellman type combing machines, a nipper comprising an upper nipper bar and a lower nipper bar, a feed grid movable relatively to said lower nipper bar, means for varying the relative movement between said lower nipper bar and said grid, said means including a cam mechanism having a cam and a cooperating element for imparting a movement to said feed grid relative to said nipper bar, an adjustable stop cooperating with said cam mechanism to determine such relative movement, the cam in said cam mechanism having a cut away portion with the wall of the cut-away portion spaced from the element of the cam mechanism directly associated with the cam during a rotary position of the cam to increase the gap between the feed grid and end of the lower bar before and during the closing of the nipper.

KARL JOSEF SCHMITI.

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