US1799066A - Reversed needle plate for feeding the sliver in combing machines - Google Patents

Description

March 31, 1931. c S'CHLElFER 1,799,066

REVERSED NEEDLE PLATE FOR FEEDING THE SLIVER IN COMBING MACHINES Filed Sept. 16, 1929 Patented Mar. 31, 1931 Mire CARLO SCHLEIFEB, F NOVARA, TTALY REVERSED NEEDLE PLATE FOR FEEDING THE SLIVER IN COMBTNG MACHINES Application filed September 16,1929, Serial No. 392,958, and in Germany September 29, 1928.

The present invention relates to combing machines for textile fibres of the-'Schleifer type (United States Patents Nos. 1,408,332, and 1,425,059) comprising two or more drums, intermittently rotated, provided at their periphery with grippers capable of being opened or closed as desired in order to seize and retain or to release, the tufts of fibre to be combed, which, being transw 1 1 1U ferred to tne grippers of the successive drums,

are combed by rotary combing cylinders and are'then passed over, by the grippers of the last drum, to a drawing off device.

It is known that inmachines of this type the feeding of the sliver of fibres to be combed is operatedby means ofa feed table having needles in combination with fixed rectilinear combs, independent of'the said feed table, serving to delimit the detachingzone between 2 the sliver of fibres andthe tuft seized by the grippers. This detaching of the tuft is mainly operated as a result of the'recoil of thefeed table, mountedon a carriage having a reciprocating movement, and'recoiling at the time of the intermittent rotation of the drum.,, H V

Thisfeeding device has the serious disadvantage of requiring a movement of recoil of the whole of the feed table which is con- I i 3 siderably greater than that which would be required for the simple feeding of the sliver. This ample alternating movement,'as a result of the relatively great inertia of the mass of the food table, greatlylimits the speed of the 3 machine and consequently the production of the machine itself. Another disadvantage consists in that with the needles of the feed table, directed as usual downwardly, at the time of the movement of the grippers which i 40 also takes place in downward directionthe thus producing a drawing that results in a deformation in the uniformity of the sliver.

The present invention relates to a feeding device for the combs of the Schleifer type which overcomes the above mentioned disad- This improved feeding device is characterized by the fact that the needles of the comb of the feed table are arranged in a direction opposite to the movement of the gripper, that is to say from below upwards if, as is usually the case, the movement of the gripper is from the top downwards. With this arrangement,

machines and delimits the detaching zone between the sliver and the tuft. v

. The detaching of the tuft isthus obtained l entirely by the rotary movement of the grippers relatively to the feed table without the intervention of the recoiling movement of the latter; the recoil of this table may thus. be

limited to the smallest necessary for the feeding. Consequently, on account of the improved arrangement, thespeed may be increased and consequently theoutput of the machine, while the fixed comb and all the mechanism relating thereto is dispensed with.

A constructional form of the invention is illustrated diagrammatically and merely by way of example in the accompanying drawings, in which Figures 1 and 2 show in longitudinal section and in two definite working positions the reversed needle plate asapplied to a combing machine of the Schleifertype.

Considering Figs. 1 and 2 of the drawing,

1 isthe firstfdrum of a combing machine of the Schleifer type which moves the grippers consisting of'jaws 2 and 8 in a complete C circle. I

One of the jaws is fixed and theother movable,-and they serve for seizing the tuft of fibres This drumis freely rotatable upon its shaft 4 and revolves intermittently in the direction indicated by the arrow. It. executes; at times a rotation through anangle which is "equal to the distance between two grippers.

A feed table which isdenoted in y 50 es. its entirety by A, is adjusted'in a radial plane lw passing through the axis of the drum and through the gripper, which has come to a standstill in the charging position I. The said feed table contains the ordinary rake with double wall 5 and 6 in the form of a duct which serves for the passage of the sliver a of fibres to be combed, the sliver being supplied by feed cylinders 7 and 7 which receive a stepwise rotation. It also contains the usual fiat comb 8 which is equipped with several rows of needles 9 which are intended for engaging in the moving sliver a through suitable rows of slots, which are provided in the usual way in the double wall of the rake.

According to the present invention the comb 8, instead of being arranged above the rake as hitherto constructed, is arranged underneath the rake and its needles therefore engage in the aforementioned sliver a by penetrating into the latter in an upward direction from below. Furthermore the upper wall 6 of the rake or the cover of the duct is made readily removable, for instance by resting in bearings 5 by means of suitable trunnions, these bearings being open at the top and extending upwards from the lateral margins 5 of the lower wall 5 of the rake. On account of this arrangement the said cover 6 can easily be removed or even simply rocked upwards, as shown in dotted lines in Fig. 1, so that the duct of the rake is entirely freed, either to facilitate the introduction of the sliver a or for purposes of inspection or cleaning. All this is not possible in the case of ordinary needle plates except after removing the comb located above- As usual the rake has a reciprocating longitudinal movement jointly with the comb 8 and the latter also'receives a forward and backward movement normal to the rake, and is therefore guided, by means of its two pins, 8 for instance, in suitable sleeves 5 which are fixedly arranged on the lateral margins 5 of the lower wall 5 of the rake. The movements of the rake and of the comb may be obtained by means of any convenient known devices, for instance as illustrated in Figs. 1 and 2 of the drawings, where the rake is connected at one of its ends with a two-armed lever 10.

This lever is rockable about a fixed fulcrum'll and the comb is connected with a bell crank lever 12 rockable about a second fixed fulcrum 14, with the interposition of a link 13. The free ends of the rocking lever and of the bell crank lever, which are provided with the rollers 10 and 12, are supported under the action of resilient pull- back devices 10 and 12 against eccentric sheaves 10" and 12" which are mounted fast'upon a revolving control shaft 15.

The method of working is as follows: When an open gripper 2, 3 arrives at the charging. point I (F ig. 1) the end of the sliver a is introduced into it, for instance in the known manner by means of a rapidly swinging introducer which is not shown, whereupon the gripper closes. Then in consequence of the rotation of the eccentric sheaves 10" and 12 the comb 8, 9 first moves downwards and then the whole arrangement of the needle plate moves back into the position shown in Fig. 2. In this way is effected the feeding operation of the sliver through a distance which corresponds to the backwards movement of the needle plate. Thereupon the comb 8, 9 moves upwards again and holds the sliver fast, while the drum of the combing machine revolves and the detaching of the fibre tuft a then proceeds. The detaching zone is in this case determined by the front rectilinear row of needles 9 of the comb of the needle plate which here acts in a manner which is known in the case of the top comb of the combing machines of the Schleifer type.

The employment of the reversed needle plate described above in combing machines of the Schleifer type enables a secure holding of the sliver a to be obtained during the delivery of the tuft. The pull that occurs produces its effect in the case of this detachment in a downward direction from the roots of the needles and therefore tends to pull the fibres always more between the needles of the comb, whereas it would tend to pull them out of the latter if the needles were reversed in the usual manner, that is, directed in the opposite direction.

I claim:

1. A device for feeding the sliver in combing machines of the Schleifer type with a feed table having needles, characterized by the feature that the needles of the comb are directed so as to penetrate from below upwards into the sliver in a direction opposite to the detaching movement of the grippers, and at the time of gripping the needles are forced to penetrate more deeply into the sliver, the first and front series of needles operating as a fixed comb serving to delimit the detaching zone between the tuft and sliver,

the detaching of the tuft being obtained sole CARLO SCHLEIFER.

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