US2729859A

US2729859A - Noguera

Info

Publication number: US2729859A
Authority: US
Priority date: 1952-01-30
Filing date: 1952-12-26
Publication date: 1956-01-10
Anticipated expiration: 1973-01-10
Also published as: GB702102A

Description

Jan. 10. 1956 J. NOGUERA DRAFTING MECHANISMS FOR TEXTILE FIBRES Filed Dec. 26, 1952 l M4 w W2 n n V W HO WM 0 JW United States PatentfO DRAFTING MECHANISMS FOR TEXTILE FIBRES Joseph Noguera, Salford, Manchester, England, assignor to Casablancas High Draft Company Limited, Salford,

Manchester, England, a British company Application December 26, 1952, Serial No. 328,040

Claims priority, application Great Britain January 30, 1952 8 Claims. (Cl. 19-135) This invention relates to drafting mechanisms for textile fibres of the kind in which a number of drafting systems, each composed of consecutive pairs of rollers, are arranged side by side, the top rollers of adjoining systems being carried by an arm pivoted at the rear of the mechanism and incorporating a weighting saddle assembly which engages intermediate necks between the aforesaid top rollers.

It is already known to apply the weighting pressure to such saddle assemblies by coil springs incorporated in the arm and it is highly desirable that such springs have a high degree of elasticity and a good margin of safety so as to be capable of working for a periodof many years without any substantial loss in strength. It is furthermore desirable to use springs of a free length which is much greater than the working length so that any variations due to differences in the setting of the arm or in the diam eter of the top roller bosses will cause variations in the fiexion of the spring which are very small in relation to the total fiexion under which the springs work. These objects can only be achieved by utilizing'springs in which, for a given pressure, the length of wire is great, so as to minimise the distortion which takes place in operation.

The difficulty which arises with a carrying and weighting arm, however, is that there is very little room within the arm itself to accommodate the springs and, as a result,

, 2,729,859 Patented Jan. 10, 1956 dotted lines and some conventional parts of the mechanism having no bearing on the invention being omitted.

In the illustrated embodiment, the invention is applied to a weighting and carrying arm composed of spaced side plates 1 and a cover portion 2 which closes the space between the upper and end edges of the plates 1. In accord ance with known practice, the rear end of the arm is pivoted between spaced parallel bracket plates 3 which form part of a bracket assembly. This assembly is clamped, on a bar 4 fixed at the rear of the drafting mechanism. Ap propriate catch means, not shown, are also provided respectively on the arm and bracket assembly for holding down the arm in its operative or weighting position. The forward end of the arm, i. e. the end remote from the pivotal mounting, is arranged to overlie the intermediate necks 5, 6 and 7 between the top rollers of adjoining drafting systems in the mechanism, each such system being composed of three

consecutive roller pairs

5a, 6a and 7a. a Incorporated partially between the arm side plates 1 is a saddle assembly which includes a front saddle 8 and a separate rear saddle 9. The front saddle 8 is intended to Weight and carry the top rollers of the front roller pairs 5a in the adjoining systems and to this end the saddle 8 is shaped to engage over and grip the intermediate neck S'between these top rollers. The saddle 8 is formed with an upper part 8a which is extended rearwardly to. provide an elongated lever 10 which lies on edge between the side plates 1 of the weighting arm and substantially parallel thereto. The lever 10 has a downwardly directed 1 slot 19a at its rear extremity and opening into the under the tendency has been to use short springs of a relatively thick wire or, in other words strong springs of low elasticity, in order to obtain the necessary pressure. The force obtainable from any given spring could, of course, be increased by mounting it on a lever, but the greater the ratio of the lever, the greater the movement of the spring in relation to the movement of the rollers to which pressure is applied so that the scope in this direction is, in practice, very limited.

A main object of the present invention is to overcome the foregoing difiiculties in a simple and efiicient manner.

According to the present invention, there is provided a drafting mechanism of the kind specified wherein a saddle assembly includes two separate saddles, one for weighting the front top rollers and the other for weighting one or more of the remaining top rollers of consecutive drafting roller pairs in adjoining systems, the action of spring means being arranged to apply the weighting pres sure to one said saddle whilst the reaction of the same spring means is arranged to apply the weighting pressure to the other said saddle. In this way it is possible to obtain double the effect from any one spring and so it becomes possible to employ the most favourable kind of long coil springs composed of relatively thin wire.

In order that the invention may be clearly understood and readily carried into effect, one embodiment thereof will now be described in detail with reference to the accompanying drawing which is a sectional elevation through a drafting mechanism, showing a weighting arm which is partially broken away to expose a saddle assembly in accordance with the invention, the bottom rollers of the mechanism being indicated diagrammatically in chain edge of the lever, this slot being arranged to receive a pivot pin 11 which is fixed between 'the arm side plates 1 a little behind the rear drafting roller pairs 7a and substantially parallel to the axes thereof. The pin 11 thus 1 forms a pivot for the saddle 8 from which the saddle can be released by lifting the slot 10a in the lever clear of the pin. The lever 10 is formed in its upper edge with a cut away portion 10b the purpose of which will be clear from the following description.

The rear saddle 9 is intended to carry and apply weighting pressure to the top rollers of the middle and

rear roller pairs

6a and 7a in the adjoining systems, and, to this end, the saddle 9 is shaped to bridge the roller necks 6 and 7 and also to engage over and grip the necks as shown. The rear saddle 9 has an upper part 9a formed with an open ended longitudinal groove 9b which opens into the top surface of the saddle upper part 9a to receive the lever 10. From the base of the groove 9b a slot 9c opens downwardly through the body of the saddle 9 and into the under surface of this saddle between the parts which engage the respective roller necks 6 and 7. This slot is provided with a transverse pin 12 which is embraced by fingers formed on a downwardly directed extension on the under edge of the lever 10, which extension projects into the slot 90.

Upstanding lugs 9d are formed approximately centrally on the upper face of the saddle part 9a, one lug being located on each side of the groove 9b, and a roller 13 is carried between these lugs. This roller 13 is positioned well clear of the upper edge of the lever 10 and is located above the aforesaid recess 10b in the upper edge of the lever.

Arranged to bear downwardly on the periphery of the roller 13 is one end 14a of a weight transmitting lever 14. This lever 14 is arranged on edge, substantially parallel to the arm side plates 1, and is provided with a slot 14b which opens into the approximate centre of the upper edge. The lever slot 14b is arranged to receive a pivot pin 15 secured, above the lever, between the arm plates 1. Between the under face of the end 14c of the lever 14, which is remote from the roller 13, and the top of the upper part 8a of the saddle 8 are arranged two coil springs 16 which are under compression. The saddle part 8a is provided with recesses opening into its upper face to receive the appropriate spring ends and the under surface of the lever end 14c is also recessed to receive the opposite spring ends.

, With such an arrangement each spring 16 will press downwardly on the front saddle 8 to apply weighting pressure on the top rollers of the front roller pairs a and, through the lever 14, will also exert a downward pressure on the saddle 9 to weight the top rollers of the middle and rear roller pairs 6a and '7 respectively. In this way both the action and reaction of the springs 16 are utilised to apply the necessary rollerweighting pressure. Thus, for example, it is possible to use two 8 lb. springs and thereby obtain a total spring pressure of 32 lbs,

I claim:

1. Weighting means for top drawing rollers in a textile fibre drafting mechanism comprising front and rear weighting saddles, spring means acting on the top of said front saddle to apply weighting pressure thereto, and weight transmitting lever means adapted to apply the reaction of the same said spring means to said second saddle for weighting the latter.

2. In a textile fibre drafting mechanism having adjoining drafting systems composed of consecutive roller pairs and a top arm which is pivoted at the rear of said mechanism and overlies intermediate necks between the top rollers of said systems, the combination of a first saddle pivoted at the rear on said arm and engaging the front 'roller neck, a second saddle engaging each rearward roller neck, spring means acting on said first saddle to apply weighting pressure thereto, and a weight transmitting lever mounted to turn about a pivot on said top arm, under the reaction of the same said spring means, and thereby to apply weighting pressure to said second saddle.

3. A combination as claimed in claim 2 inwhich said weight transmitting lever is pivoted intermediate its length with the frontvend of said lever overlying said first saddle and the rear end of said leverseating on a top bearing on said second saddle, and in which said spring means is constituted by at least one coil spring mounted under compression between the top of said first saddle and the first saddle lever enters a slot opening downwardly through the body of said second saddle from the base of 4 bottom of the forward end of said weight transmitting lever.

4. A combination as claimed in claim 3 in which each said coil spring contains a considerable length of relatively thin wire.

5. A combination as claimed in claim 4 in which said weight transmitting lever pivot is mounted transversely between side plates on said arm and engages in an upwardly directed open U-slot in said lever, and in which said front saddle is rearwardly extended to provide an elongated lever which lies at least partially between said arm side plates and substantially parallel thereto, said lever being pivoted near the end remote from said first saddle on a pin which is secured between said side plates slightly behind the rearmost drafting rollers and sub stantially parallel to the axes thereof.

6. A combination as claimed in claim 5 in which said front saddle lever extends through an open-ended longitudinal recess in the upper part of said second saddle and in which the top bearing on said second saddle for the rear end of said weight transmitting lever is constituted by a roller which bridges said recess above said front,

saddle lever.

7. A combination as claimed in claim 6 in which a bifurcated downward extension on the under edge of said the open ended longitudinal groove therein, the bifurcations on said extension engaging on each side of a pin in said slot to retain said first and second saddles against relative longitudinal displacement.

8. A combination asclaimed in claim 7 in which said first saddlelever has a downwardly directed Open-mouthed slot for engaging said first saddle pivot to facilitate dismantling of said saddles.

References Cited in the file of this patent UNITED STATES PATENTS 345,831 Clark July 20, 1886 1,694,510 Kluftin'ger Dec. 11, 1928 2,075,484 Truslow v Mar. 30, 1937 2,300,188 West Oct. 27, 1942 FOREIGN PATENTS 5,699 Great Britain of 1907

Claims

2. IN A TEXTILE FIBRE DRAFTING MECHANISM HAVING ADJOINING DRAFTING SYSTEMS COMPOSED OF CONSECUTIVE ROLLER PAIRS AND A TOP ARM WHICH IS PIVOTED AT THE REAR OF SAID MECHANISM AND OVERLIES INTERMEDIATE NECKS BETWEEN THE TOP ROLLERS OF SAID SYSTEMS, THE COMBINATION OF A FIRST SADDLE PIVOTED AT THE REAR ON SAID ARM AND ENGAGING THE FRONT ROLLER NECK, A SECOND SADDLE ENGAGING EACH REARWARD ROLLER NECK, SPRING MEANS ACTING ON SAID FIRST SADDLE TO APPLY WEIGHTING PRESSURE THERETO, AND A WEIGHT TRANSMITTING LEVER MOUNTED TO TURN ABOUT A PIVOT ON SAID TOP ARM, UNDER THE REACTION OF THE SAME SAID SPRING MEANS, AND THEREBY TO APPLY WEIGHTING PRESSURE TO SAID SECOND SADDLE.