US2395630A - Automatic control for letoff mechanism of looms - Google Patents

Description

Feb. 26, 1946. H, KURKJIAN 2,395,630

AUTOMATIC CONTROL FOR LET-OFF MECHANISM OF LOOMS Filed Sept. 28, 1943 Patented F eb. 26, 1946 AUTOMATIC CONTROL FOR LETOFF MECHANISM OF LOOMS Yervant H. Kurkjian, Clifton, N. J.

Application September 28, 1943, Serial No. 504,180

1 Claim.

This invention relates to an automatic control for let-ofi mechanism of looms, and the like, and has for one of its objects the production of a simple and efiicient automatic let-01f control which will control the tension of the brake band of the warp beam in a proper manner to maintain a uniform tension of the warp threads carried by the warp beam.

A further object of this invention is the production of a simple and efficient means for controlling the tension of the brake band of the warp beam of a loom, wherein the control means i located below and extends longitudinally of the beam in one form illustrated.

Other objects and advantages of the present invention will appear throughout the following specification and claim.

In the drawing- Figure 1 is a fragmentary front elevational view of the automatic let-off control;

Figure 2 is a fragmentary sectional view taken on line 22 of Figure l;

Figure 3 is an end elevational view of a modified form of the invention.

By referring to the drawing, it will be seen that ID designates the supporting frame upon which is mounted in any conventional way, a conventional warp-supporting beam II. The warp I2 is wound upon the beam II in the usual manner. A brake drum I3 is carried by the beam H, and a brake band I4 is anchored, as at l5, at one end to the frame It. The brake band I4 is secured at its opposite end, asat Hi, to the brake lever ll. The brake lever I1 is pivoted to the frame ||l by means of a, pivot l8, and carries, at its opposite end, a pivoted depending link l9, as shown in Figure This link I9 is pivotally connected to the inner end 2|] of a weight or tension lever 2|, which lever 2| is pivotally supported upon the frame I by a pivot 22.

A weight 23 is adjustably mounted in a selected position upon the weight lever 2|, and a spring-pressed contact roller 24 is carried by a bracket 25, which is in turn pivotally carried, as at 26, upon the lever 2|. Thi roller 24 contacts with the warp l2 in the manner shown in Figures 1 and 2, and is firmly held in this contacting position by means of the spring 21. As the warp I2 is unwound from the beam II, the roller 24 will move inwardly toward the beam II to the dotted line position shown in Figure 1, thereby reducing the pressure upon the weight beam 2| and also reducing the tension of the brake band l4 upon the brake drum IS in a manner similar to that described in my application Serial Number 477,743. As this tension is reduced, the brake band It will be loosened due to the reduction of pressure upon the lever 2|. Consequently. as the warp is unwound from the beam, the brake band Will be loosened so as to maintain at all times a substantially uniform tension upon the warp. The tension of the brake band M will be regulated in ratio to the unwinding of the warp, the

position of the roller 24 shifting automatically as the diameter of the warp reduces.

In Figure 3, there is shown a modification of the invention, wherein the control is mounted at the end of the frame It. The Warp supporting beam I l is carried above the frame Ill as shown. and the warp |2 is carried by the beam II. A brake drum I3 is also carried by the beam II and a brake band m is secured at one end to the frame Ill, as at l5, and at its opposite end, as at I6 to the brake lever H Thi lever ll is pivoted to the frame NJ, as at l8, and supports at its inner end a pivoted link IS. The link l9 is pivoted'to the inner end 2&1 of a tension lever 2|, the lever 2| being pivoted as at 22 to the frame Ill.

The tension lever 2| is connected at its outer end to a depending tension spring 21 and the opposite end of the spring 21 is connected to a crank arm 26 of the warp-engaging bell crank lever 25 The lever 25 carries a roller 24 which contacts the warp l2 wound upon the beam II and as the warp is unwound the lever 25- will swing toward the warp in the direction of the arrow and relieve the tension on the spring 21*, the lever Il the lever Il and the brake band 12 Consequently, the tension of the warp will, in this manner, be automatically kept substantially uniform at all times.

Having described the invention, what I claim is:

An automatic let-off control of the class described comprising a support, a beam carried by the support, a warp. wound upon the beam, a brake drum carriedby the beam, a brake band passing over the drum, a brake lever mounted adjacent the drum, the brake band engaging one end of the brake lever, a pivot supporting the brake lever, a tension lever pivoted to said support, a link connecting the adjoining end of said tension lever to the adjoining end of said brake lever, a depending tension spring connected to the opposite end of the tension lever, a bell crank warp-engaging lever pivoted to the frame, said warp-engaging lever having at one end a warp contacting means, and at its other end a. crank arm engaging said tension spring for maintaining a substantiallyuniform tension upon the Warp at all times and for regulating the pull upon the brake band as said warp unwinds from the beam.

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