US1993531A

US1993531A - Picker checkstrap

Info

Publication number: US1993531A
Application number: US592268A
Authority: US
Inventors: Homer J Shivell
Original assignee: Individual
Current assignee: Individual
Priority date: 1932-02-11
Filing date: 1932-02-11
Publication date: 1935-03-05
Anticipated expiration: 1952-03-05

Description

March 5, 1935. H. J. SHIVELL PI CKER CHECKSTRAP Filed Feb. 11, 1952 INVENTOR HOME? J Jan 41.

BY HIS ATTORNEYS UNITED STATES PATENT OFFICE PICKER CHECKSTRAP Homer J. Shivell, Orchard Court, Kingsport, Tenn.

Application February 11,

'1 Claims.

This invention relates to looms of the type having a reciprocating shuttle operated by a picker stick, and more particularly to a check strap for the picker stick.

In the ordinary loom construction, the movement of the picker stick is checked in each direction by a strap, the ends of which are brought together and secured by a suitable clamp attached to the loom frame, other portions of the strap being held in position by suitable guides. The strap is thus given the general form of a relatively fiat ellipse surrounding the picker stick. The picker stick, which is pivoted on the loom frame at some distance below the shuttle guide, swings back and forth within the elliptically formed check strap.

The inner end faces of the check strap which are engaged by the picker stick are substantially vertical. The picker stick is located in inclined positions at the times that it engages the check strap, and the faces of the picker stick which engage the said inner end faces of the check strap are located in correspondingly inclined positions at the times that they engage said end faces.- The result is that the checking of the picker stick is done entirely by the upper portions of the said end faces of the strap, at least when the, strap is new. This imposes undue strain on the upper part of the strap with the result that the said upper part is stretched and the strap is often broken through by the force of the blows of the picker stick against the same at the points engaged by the stick.

The principal object of the present invention is to improve the construction and mode of operation of picker check straps of the above type and to produce a construction in which the disadvantages above pointed out in thepresent construction are effectively obviated.

With the above objects in view, a feature of the present invention consists in a check strap curved or bent widthwise in a form such that when flexed into endless form and secured in place in the machine, the end faces thereof which are engaged by the picker stick will be inclined at angles substantially the same as the angles of the contact faces of the picker stick at the times when said faces engage the strap.

The invention will be clearly understood from the accompanying drawing illustrating the invention in its preferred form and the following detailed description of the constructions therein shown.

In the drawing Fig. 1 is a view in side elevation l u trating 1932, Serial No. 592,268

certain parts of the picker mechanism of a. loom having a check strap embodying the invention applied thereto;

Fig. 2 is a sectional view of the picker mechanism taken substantially on the line 22 of 5 Fi 1;

Fig. 3 is a detail view in elevation illustrating a check strap embodying the invention detached from the machine;

Fig. 4 is a view similar to Fig. 3 illustrating a 10 check strap of a slightly different form; and

Fig. 5 is a view in side elevation illustrating a picker mechanism of a m having a check strap of the usual construction applied thereto.

In the drawing the invention is shown applied 15 to the picker mechanism of a loom comprising a fixed shuttle guide indicated at 2, a shuttle 4 mounted for reciprocating movement upon said shuttle guide, a picker stick 6 pivoted at 8 to the loom frame for reciprocating movement, and a 20 contact block 10 mounted on the picker stick for engagement with the shuttle.

Fig. 5 of the drawing illustrates a check strap of the construction at present in common'use, embodied in the picker mechanism. This check 25 strap is indicated at 12 and consists of a strap, the ends of which are brought together to form an endless band elliptical in form surrounding the picker stick. The ends of the strap are secured together and attached to a bracket 14 30 mounted on the shuttle guide 2 by means of a suitable clamp. The strap is cut or otherwise formed so that it has no widthwise bend or curvature but, when laid on a flat surface, is substantially straight.

When a strap of this form is bent into an ellipse and secured in horizontal position so as to surround the picker stick, the inner contact faces of the strap at the ends of the ellipse which are engaged by the picker stick are substantially ver- 40 tical as shown in Fig. 5. Because of the swinging movements of the picker stick, the faces of the stick which engage the strap are in positions inclined to the vertical at the times that they engage the strap, as shown in said figure. The re- 45 suit is that the picker stick engages only the upper part of the strap and a heavy strain is placed on this part thereof which tends to stretch the same. The said upper part is also subjected to very heavy wear at the contact faces of the strap 50 which sometimes causes the picker stick to break through the strap. To avoid this difflculty the check strap is so out or formed that when bent into an endless band and secured in place in the 100.111, the contact faces thereof which are en- 655 gaged by the picker stick will be inclined at substantially the same angles as the angles of inclination of the contact faces of the picker stick at the times that they engage the strap. This result may be accomplished by forming the strip so that it has an angular formation, or is bent or curved in a. certain manner widthwise of the strap. In the construction shown the strap is curved widthwise on a circular arc.

As shown in Figs. 3 and 4 the check strap for the picker stick is so formed that it is curved widthwise in an arc. The are of curvature of the strap is such that when the strap is bent into elliptical form as shown in Fig. 2 and secured in place on the loom frame, the end faces of the strap which are engaged by the picker stick will be inclined at substantially the same angles as the angles of inclination of the contact faces of the picker stick 6 when the picker stick is at the limits of its swinging movements, as shown in dot-and-dash lines in Figs. 1 and 5. The engagement of the picker stick with the check strap stops the movements of the picker stick in substantially the positions shown. The radius of curvature of the strap may be varied to adapt the same to the requirements of different looms. As shown in Figs. 1, 2, 3 and 4 the strap is indicated at 16.

As shown in Fig. 3, the strap is providedat one end with a circular opening 18 and at the other with a slot 20 through which the clamping bolt of the clamping mechanism is passed in securing the ends of the strap together and to the clamp. In the construction shown in Fig. 4 the strap is provided with slots 22 and 24 through which the clamping bolt for the clamping mechanism may be passed. By providing a slot in one end of the strap, or slots in both ends thereof, the,

ends of the strap may be relatively adjusted lengthwise of the strap to vary the size of the endless band and thereby vary the positions of the stop or contact faces of the strap.

As shown in Fig. 3 the strap is curved widthwise from one end of the strap to the other. As shown in Fig. 4 the end portions of the strap have substantially no widthwise curvature and the part of the strap between said end portions is curved. This construction has certain advantages in securing the ends of the strap together, particularly in a case where the strap is relatively long.

The backward bend of the end in the form shown in Figure 4 gives a downward slope to the loop from the point of attachment at which the ends are overlapped, and in this way the sides of the loop from the point of attachment to the point at which the picker stick strikes may be substantially perpendicular to the picker stick in the angle at which it is held by the loop.

With a construction such as that illustrated in Figs. 1 to 3 inclusive, or that illustrated in Fig. 4 applied to the loom to check the movements of the picker stick, the picker stick will engage the strap throughout the entire width of the strap from the top to the bottom of the contact face thereof. Thus the strain will be distributed from the top to the bottom of each contact face and neither the upper nor the lower portions of the strap will be subjected to undue strain or wear. This will result in greatly increasing the life of the strap.

It is to be understood that the invention is not limited to the particular construction of the illustrated embodiment of the invention, but that the invention may be embodied in other forms within the scope of the claims;

Having explained the nature and object of'the invention, and having described a construction embodying the invention in its preferred form, what is claimed is:

1. A check or lug strap for automatic looms comprising a band formed from a blank curved relative to its length so that the ends of a loop formed by the band bend in a conical formation and said band having means on the ends thereof to permit its attachment to a frame of the loom at the desired position in relation to a picker stick. v

2. A check or lug strap for automatic looms. comprising a leather band formedfroma blank curved relative to its length so that the ends of a loop formed by the band bend 'in a conical formation, the band having slots at the ends thereof to permit the overlapped ends of the band to be bolted to the frame of the loom at the desired position in relation to a picker stick.

3. A check or lug strap for automatic looms comprising a band formed from a blank curved relative to its length so that the ends of a loop formed by the band bend in a conical formation adapted to be "attached to a frame of the loom at the desired position in relation to a picker stick.

4. A check strap for engaging picker sticks of looms comprising a loop formed with its upper edge to the other.

6. A check strap as defined in claim 5 in which each end is bent away from the last direction line of the adjacent portion between the CD65, but on the opposite side thereof from the bending within said intermediate portion, whereby when said ends are secured, one superimposed on another, to form a loop, the loop will slope downward from the point of securing,

7. A check strap as defined in claim 5 which when flat is arcuate from end to end.

HOMER, J. SHIVELL.