US3467146A

US3467146A - Loom reed motion

Info

Publication number: US3467146A
Application number: US688730A
Authority: US
Inventors: Stanley C Tiernan
Original assignee: North American Rockwell Corp
Current assignee: Draper Corp; Boeing North American Inc
Priority date: 1967-12-07
Filing date: 1967-12-07
Publication date: 1969-09-16
Anticipated expiration: 1986-09-16
Also published as: BE725047A; CH485890A; FR1598270A; BR6804167D0; DE1809218A1; GB1177315A

Description

Sept E69 E96@ c. HERNAN 3,46746 LOM REED MOTION Filed Dec. 7, 1 967 2 Sheets-Sheet l INVENTOR. STANLEY C.TIERNAN @www ATTORNEY Sept. 16, 1969 s. c. HERNAN LOOM REED MOTION 2 Sheets-Sheet Filed Dec. 7, 1967 j INVENTOR.

STANLEY CTIERNAN AT T OR NEY United States Patent O 3,467,146 LOOM REED MOTION Stanley C. Ternan, Bellingham, Mass., assignor to North American Rockwell Corporation, Pittsburgh, Pa., a corporation of Delaware Filed Dec. 7, 1967, Ser. No. 688,730 Int. Cl. D03d 39/22 U.S. Cl. 139-26 5 Claims ABSTRACT OF THE DISCLOSURE A reed motion for looms operable through cooperating toggle linkages to move and ixedly position the loom reed in both the partial and complete beat-up positions.

Background of the invention The invention pertains to a reed motion for looms of the type for weaving terry fabric wherein the reed is caused to move between two different positions in timed relation with the swinging of the swords to elrect partial beat-up of the lling on certain picks and a complete beatup at others.

The formation of a typical terry fabric requires three picks of filling per cycle and during the first and second picks the reed is in a position whereat only partial beat-up of the two picks is had. For the third pick of the terry cycle the reed is moved to a position to effect a complete beat-up of the three picks simultaneously during which time the pile loops are formed in a known manner.

Numerous known mechanisms of the prior art have been employed for pivoting or moving the loom reed between its positions to effect partial and full or complete beat-up of the filling.

A typical method of accomplishing this movement is by pivoting the reed to and fro in timed relation with the swinging movement of the swords by any suitable means such as gearing or cam controlled linkage members.

With increased production demands on terry looms and the greater speeds at which they are caused to operate, the forces of inertia created by movement of the swords and the lay have been substantially increased.

With the increase in these forces, the known methods of simply pivoting the reed between the partial and complete beat-up positions has not been fully satisfactory, for the elements for actuating said reed have been unable to prevent flexing and overthrow of the reed as it is caused to moveI between its two extreme positions.

The so called reed gap controls the height of the pile or terry loops and any exing or overthrow movement of the reed presents a very serious problem of obtaining and maintaining a desired reed gap setting as well as producing and maintaining uniformity in the height of terry loops.

. The mechanism according to the instant invention overcomes these problems and disadvantages by providing a means for ixedly positioning the reed in both the partial and complete beat-up positions. The mechanism provides a simplified means of adjustment of the reed gap as well as a positive control of the reed resulting in greatly improved uniformity of the pile loops.

Summary of the invention The loom reed motion of the present invention includes first and second cooperating toggle linkages supported by each of the swords and since the linkages on each sword are identical only one need be described for purpose of brevity.

The first toggle linkage has one end thereof pivotably attached to a lever forming a part of the reed holder. The second toggle linkage has one end pivotably connected to the irst toggle linkage and also includes a cam controlled actuating member which is timed to move it between its relieved and straight line or locked positions.

The first and second cooperating toggle linkages are so arranged that as the second is moved to its straight line position, the rst moves to its relieved position and in so doing pivots the reed to the partial beat-up position. The reed is fixedly held in this position by the straight line arrangement of the second toggle linkage.

As the second toggle linkage is caused to move to its relieved position its pivotable connection with the first causes the latter to assume a straight line position which pivots the reed to a full beat-up positions. In this position the reed is fixedly held by the locked or straight line position of the first toggle linkage.

Brief description of the drawing FIG. l is a view in side elevation of a loom sword showing in section the lay and reed support carried thereby and the mechanism according to the invention applied thereto;

FIG. 2 is a view in front elevation of the mechanism shown in FIG. l on a slightly enlarged scale; and

FIG. 3 is a view similar to that of FIG. 1 but on a slightly larger scale showing the manner in which the invention supports the reed in its partial beat-up position.

Description of the preferred embodiment Now referring to the figures of drawing enough of a loom is shown in FIG. 1 to serve as a basis for a detailed description ofthe invention applied thereto.

There is shown in FIG. 1 parts of a loom including a sword 10 that is pivotably mounted for swinging movement on a rocker shaft 11. Although only the right-hand sword is illustrated in the various figures of drawing, it is to be understood that a similar left-hand sword is utilized at the opposite side of the loom and is interconnected with the upper portion of sword 10 with the usual lay beam 12.

On the inner side of the sword adjacent its upper end, there is provided a support bracket 13 which is tixedly attached to the sword by means of cap screws 14 (FIGS. l, 2 and 3). A fixed stud member 15 extends from the support bracket 13 and serves as a means for pivotably mounting a reed pivot arm generally indicated by numeral 16. This pivot arm includes a hub portion 17 through which the stud member 15 extends and a depending lever 18 that is actuated to pivot the reed in a manner to be more fully described hereinafter.

An integrally formed web 19 extends upwardly from the hub 17 and terminates in the form of a laterally extending bar 20 which serves to support the channel-like reed carrier 21 (FIGS. 1 and 3). The reed is identified by numeral 22 and being ixed to the carrier 21, said reed is movable between the positions depicted in FIGS. 1 and .3.

The means for controlling the pivoting movement of the reed pivot arm will now be described.

The sword intermediate its ends supports first and second cooperating toggle linkages which are identified generally in FIGS. l and 3 by

numerals

23 and 24, respectively.

The irst toggle linkage 23 includes an upper link element 25 one end of which is pivotably attached to the lower end of the depending lever 18 as at 26. The opposite end of link element 25 is pivotably attached to the upper end of a lower link element 27 as at 28. The lower end of link element 27 is supported for oscillating movement on a stud 29 which is carried by a block member 30. This block member is centrally disposed on the Iforward portion of the sword and is attached to the latter by means of cap screws 31.

The second toggle linkage 24 includes a first link member'32 one end of which is pivotably attached to a support block 33. The support block 33 is fixed to the sword as at 34 by` means of cap screws 35 (one only shown in FIGS. l and 3). The opposite end of the first link member is provided with an arcuated slot 36 and by means of a bolt 37 extending therethrough one end of a second link member 38 is pivotably attached theretojThe opposite end of the second link member 38 attaches to the link element 27 of the first toggle linkage vat a position intermediate its ends asat 3,9. This portion of the link element 27 has a U-shaped support block 40 fixed thereto by any suitable means and provides an opening 41 within which the end of the second link member assembles. This end of the second link member is provided with a fixed pin 42 extending outwardly from each side thereof and vthe ends thereof are journaled in aligned apertures provided in the support block 40 and link element 27.

The first link member 32 has an actuating member which is in the form of a camrcontrolled rod 43 pivotably assembled to the side of said member at a point intermediate its ends as at 44.

To prevent pivotal movement of the first toggle linkage 23 beyond its locked or straight line position shown in FIG. l, an adjustable stop member generally indicated by numeral 45 is provided. This stop member includes an L-shaped support bracket 46 which attaches to the side of the sword by means of cap screws 47 (FIGS. 1 and 2). The stop member itself is in the form of a bolt 47 that assembles in a tapped hole in the support bracket and by means of a lock nut 48 is longitudinally adjustable. The head portion of the bolt 47 has fixed thereto a resilient material 49 which is positioned to contact the first toggle linkage 23 when the latter is in its straight line position shown in FIG. l.

The arcuated slot 36 in the link member 32 facilitates the adjustment of and change in a reed gap setting. When a desired setting is obtained, bolt 37 is tightened in any position within the limits of the slot which provides a locked or straight line position of the second toggle linkage 24.

In operation, rod 43 is caused to reciprocate generally vertically in timed relation to the swinging of the lay by any suitable known terry motion (not shown). As the rod is pushed upwardly it pivots the second toggle linkage 24 from the relieved position shown in FIG. l to the straight line position shown in FIG. 3. Due to its connection with the first toggle linkage 23 this movement pivots the latter from its straight line position of FIG. 1 to the relieved position of FIG. 3. This movement is carried through to the reed pivot arm 16 by means of the latters connection to the first toggle linkage 23 which in turn moves the reed 22'to the partial beat-up position shown in FIG. 1. The reed is fixedly held in the partial beat-up position by the locked or straight line position f of the second toggle linkage 24 and the forces to which said reed are subjected in this position cannot travel beyond this toggle linkage.

When rod 43 is moved downwardly the pivoting motion of the first and second toggle linkages are reversed, that is to say, the second is moved to the relieved position shown in FIG. 1 and the first is pivoted to its straight line position shown in this figure of drawing. Movement of the first toggle linkage 23 toits locked or straight line position is responsible through its connection with Vthe reed pivot arm 16 in returning the reed to a full beat-up position. In this position the reed is fixedly held and the forces to which it is subjected cannot be transmitted beyond the locked position of the first toggle linkage.

While one embodiment of the invention has been disclosed, it is to be understood that the inventive concept may be carried out in a number of ways. This invention is, therefore, not to beI limited to the precise details described, but is intended to embrace all variations and modifications thereof falling within thespirit of the invention and the scope of the'claims.

`I claim: e f

1. In a loom for weaving terry fabric having a pair of rockable swords disposed in spaced relation, a lay supported by said swords, a pivot arm mounted on each said sword adjacent said lay, a reed movable between partial and complete beat-up positions and pivotally supported by said pivot arm, means for pivoting and fixedly positioning said reed in both the partial and complete beat-up positions, said means comprising first and second cooperating toggle linkages supported by said swords, said first and second toggle linkages each including a pair of link members, said first toggle linkage being pivotably connected to said pivot arm and said second toggle linkage to said first toggle linkage, and a further means for effecting alternate movement of said linkages between straight line and relieved positions -whereby said reed is fixedly positioned in complete beat-up position by the straight line position of said first toggle linkage and in the partial beat-up position by the straight line position of said second toggle linkage.

`2. The mechanism according to claim 1 wherein said means further includes an adjustable stop member for limiting the movement of said first toggle linkage.

3. The mechanism according to claim 1 wherein said further means comprises a cam controlled actuating member pivotably attached to said second toggle linkage for pivoting the latter between its straight line and relieved positions.

4. The mechanism according to claim 3 wherein said second toggle linkage includes a pair of link members pivotably and adjustably attached one to the other with said actuating member being connected to one of said link members.

5. The mechanism according to claim 4 wherein said first toggle linkage includes a pair of pivotably connected link elements with one of said elements being attached to said pivot arm and the other having one of said link members pivotably attached to a point intermediate its ends.

References Cited UNITED STATES PATENTS 1,657,429 1/ 1928 Brown 139-27 2,090,071 8/1937 Robertson 139-190 2,625,956 1/1953 Sippez 139-26 3,136,342 6/1964 Short 139-26 3,265,095 8/ 1966 Nichols et al. 139--26 J AMES K EE CHI, Primary Examiner