US2381670A - Automatic tension control for letoff mechanism of looms - Google Patents

Description

I Aug. 7, 1945, Y Y. H. KURKJIAN/ AUTOMATIC TENSION CONTROL FOR LET-OFF MECHANISM OF LOOMS Filed Jan. 25, 1944 Patented Aug; 7; 1945 UNITED STATES PATENT OFF-ICE AUTOMATIC TENSION CONTROL FOR i 'LETOFF MECHANISM OF LOOMS Yervant H. Kurkjian, Clifton, N. J. Application January 25, 1944, Serial N 0. 519,664

6 Claims.

This invention relates to an automatic control for the let-off mechanism of looms, and the like, and has for one of its objects the production of a simple and efiicient mechanism which will control the tension of the brake band of thewarp beam m a proper manner to maintain a uniform tension of the warp threads carried by the warp beam. c r j A further object of this invention is the production of a simpleand eflicient means for shifting the position of the connection of the brake band with respect to the tension control means in a manner to maintain a uniform tension upon the warp threads which are carried by the warp beam of a loom. i

Other objectsandadvantages of the present in- Figure '2'isan irregular sectional view taken.

on line 2-2 of Figure 1; t

Figure 3 is an enlarged vertical sectional view taken on line 3-3 of Figure 1;

Figure 4 a side elevational viewof a modified form of my device; l s

Figure 5 is a vertical sectional view taken on line 5-5 of Figure 4.'

By referring to the'drawing, itwill be seen that designates theframe of the loom of a conventional 'type;-which carries the warp beam H of the: conventional type. "Sincethe present invention relates to the automaticlet-ofi control mechanism, and not to the general loom constructicn, no effortis made to illustrate the detail construction of the loom itself, and only those parts vital to the invention are illustrated and described." 1

A tension control arm i2 is carried by a shaft |3 rotatably mounted on the frame l0, as shown in Figures 1 and 2. i This arm l2 carries a warp contact roller M, at vits upper or outer end for direct contact with the warp threads which are wound upon the warp beam II. A brake drum l5 is carried by thebeam I i, and a brake band l6 passesover the drum l5, and is anchored at one end I! to the frame H1. The opposite end of the brake band H5 is secured to a brake band connecting link I8." The-lower end of the link I8 carries a journal spin l9which is slidably mounted through a horizontal slot 2|] formed in one end of the tension lever 2|. This lever 2| is pivoted to the frame [0, as at 22.

The tension control arm I2 is carried by a suitable shaft l3, as stated, which shaft also carries a tension arm 23v which is located just above the inner end of the tension lever 2|. A tension spring 25 connects the tension arm 23 and the inner end-24 of the tension lever 2|, as shown in Figure 1; The shaft |3x also carries a depending finger-26 to which is pivotally connected a shifting rod 21 and this rod 21 isconnected at its opposite end to the pin I9 which forms the lower end of the brake band connecting link I8.

' By considering Figures 1, 2 and 3, it will be noted that as the warp is unwound from the beam H, the control arm|2 willswing inwardly towardthe warp to continue to contact the Warp.

As the arm l2 swings inwardly, the'tension arm 23 will swing downwardly thereby adjusting the tension upon the spring 25 and allowing the tension lever 2| to'slightly release pressure upon the brake band 16'. At the same time the depending finger 26'swings toward'the link It and the shifting rod 21 will shift the journal pin IQ of the link 18 longitudinallyof the slot 20 and increase the distance of the link I8 from the pivot 22 and thereby decrease the leverage ex-' erted by the tension lever 2| ,upon the brake band l6.

In Figures 4 and 5 there is shown a modified form of automatic control wherein an designates the frame of the loom above which is supported the beam 3!; The Warp W is wound upon the beam 3| and this warp is engaged by a tension control arm 32 which is carried by a shaft 33 rotatably supported upon the frame 30. The arm 32 is carried inside of theirame 30 in a position to contact the warp. This shaft 33 carries an upwardlyextendin'g vfinger 34 and a laterally extending tension arm- 35, both of which are located outside of one end of the frame 3|],

as shown in Figure 4. I 1

A compound leverage assembly 36 is carried by the frame just above the finger 34" and this leverage assembly 36 comprisesa primary lever 31 and a secondary lever 38. Thelever 31 is pivoted, as at 39, to the frame 30 and thelever 38 is pivoted at 4-0 to theframe 30. These levers are arranged in longitudinal alignment as shown. The outer end ,M or lever 31 is connected to one end of a tension spring 42 and the opposite end of the spring 42 is connected to the tension arm 35. The levers 31 and 38 are provided with overlapping the adjoining lever. A sliding shoe 44 frictionally engages the under face of the lever 38 near its outer end beyond and under the pivot 40. A brake band 45 is anchored at one end to the frame 30 and the opposite end of the band 45 engages a link 46. This link 46 detachably fits into the notch 41 of the shoe 44. This shoe 44 is engaged by one end of the shifting rod or link 48, the opposite end of the link 48 being pivotally connected to the finger 34.

As the warp 32 is unwoundfrom the beam 31, the arm 32 swings inwardly thereby swinging the tension arm 35 upwardly and releasing tension of the spring 42 and also releasing tension upon the compound leverage assembly 36. At the same time the shoe 44 is moved outwardly of the outer end of the lever 38 increasing the lever arm beyond the pivot 40 and further releasing tension upon the brake band 46.

Having described the claimed is:

invention, what is 1. An automatic let-off control of the class described comprising a beam, a warp carried by the beam, a tension control arm contacting and controlled by the amount of warp carried by the beam, a brake means for said beam, a lever means controlling the brake, tension means connecting the lever means with the arm to hold the arm at all times in contact with the warp, the movement of the arm being adapted to automatically control the pressure upon said brake control lever means to maintain a uniform tension upon the warp, connecting means between the brake and the lever means, and means linking said arm with said connecting means for automatically shifting the connecting means relative to the lever means to automatically adjust the leverage of said lever means as said arm is swung.

2. An automatic let-off control of the class described comprising a beam, a warp carried by the beam, a tension control arm contacting and controlled by the amount of warp carried by the beam, a brake means for said beam, lever means controlling the brake, tensionmeans connecting the lever means with the arm to hold the arm at all times in contact with the warp, the movement of the arm being adapted to automatically control the pressure upon said brake control lever means to maintain a uniform tension upon the warp, a substantially horizontally slidable connection for attaching the brake means with said lever means, and a connection between said arm and said slidable connection for adjusting the slidable connection longitudinally of said levermeans as said arm is moved for regulating the tension upon said brake means.

3. An automatic let-off control of the class described comprising a beam,-a warp carried by the beam, a tension control arm contacting and controlled by the amount of warp carried by the beam, a brake means for said beam, lever means controlling the brake, tension means connecting the lever means with the arm to hold the arm at all times in contact with the warp, the movement of the arm being adapted to automatically control the pressure upon said brake control lever means to maintain a uniform tension upon the warp, a substantially horizontally slidable releasable connection for attaching the brake means with said lever means, and a connection between said arm and said slidable connection for adjusting the slidable connection longitudinally of said lever means as said arm is moved for regulating the tension upon said brake means.

4. An automatic let-off control of the class described comprising a beam, a warp carried by the beam, a tension control arm contacting and controlled by the amount of warp carried by the beam, a brake means for said beam, lever means controlling the brake, tension means connecting the lever meanswith the arm to hold the arm at all times in contact with the warp, the movement of the arm being adapted to automatically control the pressure upon said brake control lever means to maintain a uniform tension upon the warp, a substantially horizontally slidable connection for attaching the brake means with said lever means, a connection between said arm and said slidable connection for adjusting the slidable connection longitudinally of said lever means as said arm is moved for regulating the tension upon said brake means, and a link connected to the brake means and engaging said slidable connection.

5. An automatic let-off control of the class described comprising a beam, a warp carried by the beam, a tension control arm contacting and controlled by the amount of warp carried by the beam, a brake means for said beam, lever means controlling the brake, tension means connecting the lever means with the arm to hold the arm at all times in contact with the warp, the movement of the arm being adapted to automatically control the pressure upon said brake control lever means to maintain a uniform tension upon the warp, a substantially horizontally slidable connection for attaching the brake means with said lever means, a connection between said arm and said slidable connection for adjusting the slidable connection longitudinally of said lever means as said arm is moved for regulating the tension upon said brake means, a link connected to the brake means and engaging said slidable connection, and said slidable connection comprising a longitudinal slot formed in one end of said lever means and said link fitting insaid slot.

6. An automatic let-01f control of the class described comprising a beam, a warp carried by the beam, a tension control arm contacting and controlled b the amount of warp carried by the beam, a brake means for said beam, lever means controllingthebrake, tension means connecting the lever means with the .arm to hold the arm at all times in contact with the warp, the movement of the arm being adapted to automatically control the pressure upon said brake control lever means to maintain a uniform tension upon the warp, a substantially horizontally slidable connetcion for attaching the brake means with said lever means, a connection between said arm and said slidable connection for adjusting the slidable connection longitudinally of said lever means as said arm is moved for regulating the tension upon said brake means, a link connected to the brake means and engaging said slidable connection, and said slidable connection comprising a slidable shoe fitting against the under side of said lever means near the outer end thereof, and a link carried by the brake means for engaging a receiving means carried by the shoe.

YERVANT H. KURKJIAN.

Images