US2248832A - Traverse mechanism for textile machines - Google Patents

Description

8, 1941. H. w. TAYLOR TRAVERSE MECHANISM FOR TEXTILE MACHINES Filed lay 14, 1940 INVENTOR 17.11472: [01' ATTORNEY Patented July 8, 1941 TRAVERSE MECHANISM FOR TEXTILE MAC HINE

Howard W.'Taylor, Westerly, R. L, asslgnor to The Atwood Machine Company, Stonington, Conn., a corporation of Connecticut Application May -14, 1940, Serial No. 335,071

4 Claims.

This invention relates to traverse mechanisms for textile machines and more particularly to obtained by a face cam of multi-lobed form having varying heights on its lobes and engaging a projection on the adjacent face of a companion driving gear so that these axial movements of the traverse cam are variable in extent.

Another object of the invention is to rotate the traverse cam by one of a pair of differential gears, a projection on the face of one of the gears engaging the cam faces of a multi-lobed cam on the adjacent face of the other gear so that the gears are alternately separated and permitted to move toward each other while the gears are simultaneously rotated by a common pinion;

there being a spring normally forcing the gears toward each other but permitting them to separate as the projection on one gear rides over the successive lobes of the cam on the other gear.

With the above and other objects in view the invention includes the features of construction and operation set forth in the following speciflcation and illustrated in the accompanying drawing.

In the accompanying drawing annexed hereto and forming a part of this specification, I have shown the invention as embodied in or applied to a silk twisting machine but it will be understood that the invention can be otherwise embodied and that the drawing is not to be construed as defining or limiting the scope of the invention, the claims appended to this specification being relied upon for that purpose.

In the drawing:

Fig. 1 is a front elevation of the improved traverse mechanism partly in section as applied to a standard form of textile twisting machine;

Fig. 2 is an end elevation of the traverse mechanism shown in Fig. 1.

Fig. 3 is a side view of one of the differential driving gears, showing the multi-lobed cam formed on one face thereof; and

Fig. 4 is a development of the cam surfaces on the gear shown in- Fig. 3.

In the above mentioned drawing there has been shown but one embodiment of the invention which is now deemed preferable, but it is to be understood that changes and modifications may be made within the scope of the appended claims without departing from the spirit of the invention.

Briefly, and in its preferred aspect, the invention may include the following principal parts: first, a traverse bar operating lever preferably pivotally mounted at its-lower end and attached adjacent its upper end to a traverse bar as by means of a reach arm; second, a cam having a circumferential cam groove thereon engaging a stud outstanding from the operating lever, the

cam being mounted for simultaneous rotation and lateral movement; third, a pair of gears having a slightly different number of teeth; fourth, a driving pinion engaging the teeth of both gears so that these gears will be simultaneously rotated; fifth, a plurality of cam surfaces of different height on the face of one gear adjacent the other gear; sixth, a projection on the other of said gears adapted to successively engage the cam surfaces on said first gear during their relative rotation; and seventh, spring means normally forcing the two gears toward each other.

Referring more in detail to the figures of the drawing there is shown at ill a traverse bar mounted for reciprocation and provided with yarn guides II but one of which is shown. As the traverse bar forms no part of the present invention and may be of any form further description is not thought to be necessary. At one end the bar II has attached to it a reach arm I! which in turn is attached adjustably to a traverse operating lever l3. As shown in Fig. 1 the lever I3 is pivotally mounted at its lower end on a bracket I 4 secured rigidly to an end frame l5 of the textile machine to which the present invention is applied.

To oscillate the lever l3 about its pivot to reciprocate the traverse bar Hi there is provided I a stud I 6 outstanding from the lever I3 and adapted to engage the peripheral groove of a traverse cam I! mounted for axial as well as rotary movement. This cam I1 is keyedor otherwise secured to a sleeve l8 forming the hub of a gear l9 mounted rotatably upon an outstanding arm or shaft 20 fastened to the end frame 15 and extending horizontally therefrom. The gear I9 is rotated as by means of a pinion 2 aacaesa 2| which may be driven by any preferred means such as a shaft 22.

Rotation of the traverse cam III by the means above described will cause reciprocatory movements of the rod I ll between fixedlimits and of exactly the same length. In building kages of some types it is desirable to vary the m and forth traverse movement of the guides ll so that successive reciprocations of the bar will vary slightly in length. Also it is desirable to slightly vary the limits of this reciprocatory movement, the reversals of movement taking place at slightly different positions successively during a number of reciprocations. Thereafter the cycle of movement may be repeated, there being preferably a definite sequence of variable movements of the traverse bar l during which the lengths of the traverse movement'and the points of reversal of the traverse bar are varied.

To effect this variable traverse movement extremely slow but short back and forth axial or endwise movements are imparted to the cam ll while it is being rotated at constant speed. The extent of the successive axial movements of the cam are varied by means presently to be described and the speed of this axial or endwise movement of the cam I1 is extremely slow relatively to its rotary movement.

Adjacent the driving gear I9 for the cam l1 and rotatable on the shaft 20 is a companion gear 23 driven by the pinion 2i simultaneously with the gear IS. The numbers of teeth in the gears l9 and 23 are slightly different so that one of these gears rotates slightly faster than the other. On the face of gear l9 adjacent the gear 23 are formed a plurality of annularly positioned cam surfaces 24 of varying height. A development of these surfaces 24 is shown in Fig. 4 by whichit height of the successive rises of the cam surfaces- 24 the toward and from movements of the cam l1 relative to gear 23 vary during its rotation. In

' this manner the rod III is slowly but constantly varying the length of its successive strokes and also its points of reversal, this variation continuing until the gear 23 rotates one complete revolution relative to the gear I9. After this has taken place the rod l0 repeats its successive variable movements in the same order and manner. By va' 'y ng the relative heights of the cam surfaces .24 and the relative rotative speeds of the gears l3 and 23, the variation in travel of the bar Ill and the positions of its reversals of movement maybe varied.

I claim as my invention:

1. A traverse mechanism for textile machines comprising in combination, a traverse bar, an operating lever therefor, a cam engaging said lever, means to rotate said cam, supplementary cams of varying heights on a face of said rotating comprising a plurality of supplementary cams of will be seen that they are of gradually increasing a 23 rotate at slightly different speeds due to their having a different number of teeth the projection 25 slowly rides over the successive cam rises 24 on the face of gear l9.

Normally forcing the cam l1 and the gear 23 toward each other is a spring 26. This spring 26 may surround a rod 21 fastened upon the end of shaft 20 and having a nut 28 threaded upon its outer end. By varying the position of nut 23 on the rod 21 the pressure forcing the cam l1 toward the gear 23 may be varied.

From the above it will be seen that rotation of the gears l9 and 23 simultaneously but at slight different rotative speed will cause the projection 25 to slowly ride over the cam surfaces 24 and alternately move the gear [9 laterally a slight distance from gear 23 and permit gear 19 to move toward gear 23. Due to the difl'erences in Yes different height on a face of said rotating means and means normally holding said rotary cam and rotating means toward said projection.

3. A traverse mechanism for textile machines comprising in combination, a. traverse bar, an operating lever therefor, a cam engaging said lever, and means to simultaneously rotate and laterally move said cam, said last named means comprising, a plurality of supplementary cams of different height on a face of said rotating means, a projection engaging said supplementary cams and slowly rotated relative to said rotary cam, and means normally holding said rotary cam toward said projection.

4. A traverse mechanism for textile machines comprising in combination, a traverse bar, an operating lever therefor, a rotary cam engaging said lever, whereby said cam reciprocates said' bar, means to rotate said cam, supplementary cams rotating with said rotary cam for moving said rotary cam laterally variable distances during its rotation, means normally forcing said rotary cam in one direction, a rotatively mounted projection adapted to successively engage said supplemental cams, and differential driving means for rotating said supplementary cams and projection.

HOWARD W. TAYLOR.

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