US2421555A - Stop motion for spinning and like textile frames - Google Patents

Description

June 3, 1947. I Q 2,421,555 STOP MOTION FOR SPINNING AND LIKE TEXTILE FRAMES Filed 00 16. 1945 2 Sheets-Sheet 1 June 3, .1947. s, FRASER I 7 2,421,555

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Patented June 3, 1947 STOP MOTION FOR SPINNING AND LIKE TEXTILE FRAMES Gordon Scott Fraser, Arbroath, Scotland, as-

signor to Douglas Fraser & Sons Limited, Arbroath, Angus, Scotland, a corporation of Great Britain Application October 16, 1945, Serial No. 622,675

In Great Britain Marcl 5, 1945 2 Claims. (01. 57-84) pivot or a knife-edge, to a point of which block spaced from said fixed pivot or knife-edge is pivotally connected one end of a link pivotally connected at its opposite end to the forward arm of a manually operable lever. The several pivots are substantially aligned in the position occupied by the detector or feeler when th detector or feeler is in engagement with the material, the

block and the link constituting in effecta toggle device. I

The manually operable lever is mounted between its ends on a fixed pivot, and the remote arm of said lever is pivotally connected to a weighted lever formed adjacent to its pivot with a nose cngageable with a pivotally supported arm carrying the arbor of the retaining pressing roller.

The pivot of said arm may be the pivot of the manually operable lever.

In setting the mechanism the free or forward end of the manually operable lever is depressed, and the toggle brought to approximately dead centre position; the weighted lever is in raised position, and held there as the manually operable lever is latched by the toggle device, while the nose projecting from the weighted lever abuts on the arbor-carrying arm whereby the retaining pressing roller is held against its companion retaining roller.

An extension of the weighted lever presents a nipping element co-operative with a stationary nipping element so arranged that on operation of the stop motion the material is held at a point beneath the retaining rollers before the retaining rollers are separated. j

If, now, on breakage of the material, the detector 01' feeler swings outwardly, the toggle is broken, the forward arm of the manually operable lever is tilted upwardly as the weighted lever falls, the material is gripped between the nipping elements and held against further feed-in, the arbor-carrying arm is free to tilt and the retaining pressing roller moves under the action of its in the direction away from its companion retaining roller.

To reduce friction between the link and the block, the lower end of the link, in lieu of carrying a pivot pin, may be formed with a projecting knife-edge element (the edge of which may be rounded) engaging a, suitably shaped socket opening in the block.

In a modification the arbors of the retaining pressing roller and of the drawing pressing roller are carried by arms of a multi-armed lever the fulcrum pin of which is movable in a slot, said multi-armed lever being influenced by a spring to withdraw the rollers carried thereby from their companion rollers when the weighted lever falls. In the accompanying drawings Fig. 1 is an end elevation partly in section of a stop-motion according to th invention. Fig. 2 is a detail view of a modified mounting of the link; Fig. 3 is a view similar to Fig. 1 but showing a modification in which the retainin pressing roller and the drawing pressing roller are adapted to be moved simultaneously away from their companion rollers. Themechanism illustrated in Fig. 1 includes a detector or feeler I depending from a block 2 formed with a bearing face for engagement by a fixed knife-edge member 3, to a point 4 of which block 2 spaced from the knife-ed e is pivotally connected one end of a link 5 pivotally connected at its opposite end at 6 to the forward arm I of a manually operable lever. The pivots l and B .are substantially aligned with the knife-edge in the position occupied by the detector or feeler I when the detector or feeler is in engagement with the material indicated at A, the block 2 and the link 5 constituting in effect a toggle device.

I The manually operable lever is mounted between its ends on a fixed pivot 8, and the remote arm 9 of said lever is pivotally connected to a weighted lever l0 formed adjacent to the pivot 8 with a nose ll, engageable with an arm l2 pivoted at 8 and carrying the arbor l3 of the retaining pressing roller M.

In setting the mechanism the free or forward end of the manually operable lever is depressed, whereby the toggle is allowed to assume approximately dead center position in which it is retained by the action of the material on the feeler I; the weighted lever I0 is in raised position, and held there as the manually operable lever 1, 9 is latched by the toggle device, while the nose II projecting from the weighted lever in abuts on the arbor-carrying arm l2 whereby the retaining pressing roller I4 is held against its comown weight and that of the arbor-carrying arm panion retaining, roller 15.

on breakage of the material, the detector or feeler l swings action of gravity, the block 2 is rocked so that the knife-edge is no longer in line with the points 4 and 6, and the forward arm 1 of the manually operable lever is tilted upwardly about the pivot 9 by the action of the weighted lever l on the arm 9. The weighted lever l0 swings about its pivotal connection with the lever arm 9, while the extension I of said lever swings upwardly and grips the material between the nipping element l1 and the stationary nipping element l8 at a point beneath the retaining roller. With further downward movement of the weighted lever ID in an are about the pivotal connection with the lever arm 9, the nose II no longer presses against the arm l2, so that the retaining pressing roller I4 is free to move under the action of its own weight and that of the unbalanced arm l2 in the direction away from its companion retaining roller l5.

In the modification shown in Fig. 2 the link 5 presents at its lower enda knife-edge member 5a engaging the inverted V-shaped upper portion of a recess 2a formed in the block 2.

In the modification illustrated in Fig. 3 the retaining pressing roller and the drawing pressing roller are jointly movable towards and from their companion rollers, and in this figure parts corresponding to those in Fig. 1 are indicated by the same reference numerals distinguished by the addition of the exponent In this construction the link 5' is connected to an extending arm of a lever 2| crooked at the end remote from the link connection 6 and pivoted on a stationary pin 22. The lever 2| carries a pin 23 on which is pivoted a manually operable multi-armed lever 24, the forwardly extending arm of which forms a handle 25, while the rearwardly extending arm is furnished with a weight 26. A downwardly extending arm 21 of the lever 24 is furnished with a pin 28 on which is fulcrumed a further multi-arrned lever 29, the pin 28 engaging in a slot 30 in a forked arm 3| of the lever 29. The lever 29 carries at its opposite ends the arbor l3 of the retaining pressing roller l4 and the arbor 32 of the drawing pressing roller I9, respectively.

A tension spring 33 is connected at one end to the lever 29 and at the opposite end to a stationary part of the frame.

The retaining pressing roller 14 and the drawing pressing roller l9 are normally held pressed against their respective companion rollers l5 and 20' with the material interposed in the nips of said rollers, by pressure of the pin 28 against the end wall of the slot 30 under the influence of the weighted lever 24.

When, now, on breakage or failure of the material, the detector or feeler I swings outwardly, the toggle is broken, the block 2 leaves the knife- 4 edge member 3 and the lever 24 is tilted and tilts the lever 2| about the pivot 22. At the same time the weighted lever 24 is retracted in the direction of the arrow B by means of a projecting finger 34 on the lever 24 coming into contact with and sliding down an inclined surface presented by a slide member 35 extending angularly from the stationary frame. This retractive movement of the lever 24 draws the pressure pin 29 backwards in the slot 30, whereby the pressure of the retaining rollers l4, I9 is released, the movement of the pin 28 providing a clearance in the slot 30 which permits the spring 33 to withdraw the lever 29 and move the rollers l4 and 9' avsay from their-respective companion rollers The backward movement of the lever 29 is limited by a fixed stop 36 and by an extension arm 31 of the lever 2|.

The mechanism is reset by means of the handle 25 operating the weighted lever 24.

What is claimed is:

l. A stop motion mechanism for spinning and like textile frames having a retaining pressing roller, and a companion roller, comprising a member affording a pivot bearing and a feeler forming with said member a unit, a stationary knifeedged member engageable with the bearing, a link having at one end a permanent pivotal connection with said first mentioned member, a lever to which said link is pivoted at its other end, said link and said first mentioned member constituting limbs of a toggle, and a weight device influencing said lever, said weight-device normally functioning to urge the retaining pressing roller against its companion roller, but being free to fall on the breaking of the toggle.

2. Stop motion mechanism as claimed in claim 1 for spinning and like textile frames having a retaining pressing roller and a drawing pressing roller and companion rollers cooperative with said pressing rollers to draw out the yarn, said mechanism including a multi-armed lever pivoted to the weight-influenced lever, and carrying said retaining pressing roller and said drawing pressing roller.

GORDON SCOTT FRASER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS

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