US1742776A

US1742776A - Warp-stop mechanism for looms

Info

Publication number: US1742776A
Application number: US353826A
Authority: US
Inventors: Julius E Mccarvey
Original assignee: Draper Corp
Current assignee: Draper Corp
Priority date: 1929-04-09
Filing date: 1929-04-09
Publication date: 1930-01-07
Anticipated expiration: 1947-01-07

Description

Jan. 7, 1930. J, MccARVEY 1,742,776

WARP STOP MECHANISM FOR LOOMS Filed April 9, 1929 Ar TO RNE Y Patented Jan. 7, 1930 UNITED STATES PATENT oFricE J'UHUS ,MCQAIRVEY, OJ! ATLANTA, GEORGIA, ASSIGNOR TO DRAPER CORPORATION, ,OFjHOPEDAIIE, MASSACHUSETTS, A CORPORATION OF MAINE WARE-STOP "MECHANISM FOR LOOMS Arnhem/unifie Ap Thisrinventionnelates to warpstop mechaior .leolns and. more particularly Idilieeted to warp stop mechanisms ofthe transwersely ,lmowsable toothed detector bar type wherein-the detector bar is ,given its transverse movements dram the actuator through a drink cennection therewith.

It is inoiw the :ordinary practice to provide farlil'ik cormection between the actuator and the transversely movable detector bar, and the :1-i-nk,-is usually pivoted to the actuator and has an open slot in its opposite end for engagement vwitha pin or projection extend- :laterally item .the transversely movable detector $193!,-

:It sfrequently i happensiduring weaving or mani-pulatiomof theioom Zby the attendant, -that..one -or more of {the :detecting bars may become accidentally :detached from its link connection with itsadtuator, because the link is connected-to the connector bar by an open .slot and may be readily, through accident .or otherwise, detached therefrom. Should this occur :and the loom besta-rted, the detector bar thus detached from its actuator would fail to fiunction, with .the result that .no detection ot .a warp ,fault in the series of 'drop wires associated with xsuch detector :bar would occu r andtimperdieet cloth isIiablc :to .be woven.

One of-the important iieatures of the present invention therefore resides in a simple :but efiective lock ator securing the detector fbar to'the link connection between the bar and its actuator, so :that accidental detach-- mentof the link from the detector bar is prevented, and when intentionally detached the 'ilockkitself will signal thefact that'the parts are disconnected.

The invention and novel features thereof --will -best 'be made clear from the "following description when :read in connection with the accompanying drawings showing one good form thereof. I

In ithe drawing Fig. 1 is a side elevation of one end of a warp stop mechanism containing the present invention;

h ema i n of 1929. Serial No. 353,826.

disassembled parts which more particularly include the present invention;

Fig. v3 is a perspective view showing the pasts of Fig. 2 in their operative position; an

Fig.4 is a side view of the connector link and lock with parts in section.

The locking connection between the trans versely movable detector bar and its actuator may be advantageously employed in any usual form of this type of warp stop mecha-. nism, but, as indicated in Fig. 1 for illustrative purposes, the warp stop mechanism is of the general type shown in the patent to Davis and Johnson, No. 1,538,625, dated May 19 1925.

As more fully described in the patent mentioned, the warp stop mechanism comprises the end supports or brackets 1, one at each side of the loom, between which extend the warp rests or spacing bars 2. Mounted in a bracket 3 extending from .one of the side supports is the rock shaft 4 to which is connected the arm 5 which may be actuated through a link 6 and rod 7 from any convenient going part of the loom, as, for instance, a cam on the lower or cam shaft, as usual. Mounted upon the rock shaft 4 is the rocker 8, of which there may be any suitable number corresponding to the number of banks of drop wires employed, and mounted upon the rocker 8 is the actuator 9 having pins 10 which rest in seats in the rocker 8 under the influence of a spring 11 normally acting as set forth and more fully described in the patent to which attention is above dirooted, to maintain the actuator and rocker in operative relation and yet permit the actuator to come to rest when the transversely movable toothed detector bar to which it is connected is arrested on the occurrence of a warp fault.

Pivotally mounted on the rocker at 12 is a finger 13 connected at 14 to the actuator, the construction being such that should the actuator be arrested while the rocker continues to move, the outer end portion of the finger 13 will be depressed and act through a train of mechanism to effect loom stoppage. In the present instance of the invention the finger 13 acts upon an arm 15 which rests upon the upper end portion of a plunger 16 associated with a flexible sheathed wire 17 which upon the occurrence of a warp fault is moved longitudinally, as more fully explained in the Davis and Johnson patent, to effect loom stoppage. It is not necessary herein to further describe the particulars of the warp stop mechanism in detail since these are all fully described in said patent and the details of such mechanism form no essential part of the present invention.

Extending between the side brackets or supports 1 of the warp stop mechanism is the transversely movable detector bar 18, provided with a series of teeth 19, and associated with the movable detector bar is the relatively fixed toothed detector bar 20 which may be conveniently supported in the upper portion of the side brackets 1 of the warp stop mechanism, as more fully described in the above-mentioned patent, and as generally indicated at 21, Fig. 1.

In warp stop mechanisms of the transversely movable detector bar type, the movable detector bar is provided with a lug or projection for engagement with the link connection between the movable detector bar and actuator, and these parts may be variously contrived, but, as indicated in the present instance of the invention, the fixed detector bar has an open slot 22 in which may slide the pin or projection 23 secured to the movable detector bar 18.

In. the present instance of the invention, the pin or projection 23 has a head portion 24 and a shank portion 25, and also a reduced portion that is secured to the detector bar 18 by the nut 26. The details of this construction, however, may be varied to suit conditions of use.

Pivotally mounted upon the actuator 9 at 27 is a link member 28 preferably formed substantially as an inverted U-shaped member, as shown in the drawing, to pass above and straddle the upper portion of the adjacent side support or bracket 1. At its opposite end the link 28 is provided with a notch or socket 30 conveniently formed in the downwardly extending leg 29 of the link 28. The socket has the side portions 31 which, when the link moved into engagement with the pin 23 of the transversely movable detector bar, straddle the shank 25 of the pin, with the result that the actuator will transmit to the movable detector bar its transverse detecting movements.

As above indicated, the present invention is directed to locking means tor locking the swinging link in operative engagement with the transversely movable detector bar. In the embodiment of the invention illustrated in the drawing, the locking member 33 is pivotally mounted upon the downwardly extending portion 29 of the link by the pivot pin 34 and the locking member is mounted in the slot 35 as will be apparent from the drawing.

The locking member illustrated is provided with the foot portion 36 adapted to extend across the entrance of the socket 30 when the locking member is rocked to its locking position, best shown in Fig. 4. When the parts are in this position the foot 36 lies beneath the pin and prevents the link 28 from being swung upwardly out of engagement with the pin 25. The locking member 33 is preferably provided with an upwardly extending end or handle 37 which may be readily grasped to shift the locking member to and from its locking position, and this handle serves also as a signal adapted to show whether the locking member is in its locking position, since the loom attendant may determine by glancing at the handle 37 whether the link 28 is locked to the pin 25.

In many cases it is desirable to positively retain the locking member 33 in its active or pin-engaging position of Fig. 4c, and the present invention further contemplates locking means for positively holding the locking member 33 in its active position. While such locking means may be variously constructed it is shown as consisting of a blade 38 one end of which is seated in a notch 39 formed in the upper face of the link 28 and the opposite end of which may be engaged with a notch 40 formed in the handle 37, the arrangement being such that the outer end of the blade 38 may be shifted laterally slightly out of engagement with the handle 37 as will be apparent from Fig. 2, to permit movement of the locking member 33 to the inactive position of Fig. 2. The notch 39 may be constructed to snugly embrace the end of the blade 38, while at the same time permitting the slight lateral movement of the blade above mentioned.

From the construction described it will be apparent that the link between the actuator and the toothed detector bar may be manually locked and unlocked by shifting the handle 37 and that the handle serves also as a signal to show when the parts are locked together. It will also be seen that the locking member for the link 28 is positively held in its active position so that the link cannot become accidentally disengaged from the toothed detector bar. By mounting the locking member in the slot 35 of the link, proper directional movement of the locking member is assured as it is thrown to and from looking position, and the foot portion 36 of the locking member is accurately positioned and maintained beneath the projection of the toothed detector bar when the locking member is in locking position.

What is claimed is 1. In a warp stop mechanism for looms, the combination of drop wires, a transversely movable toothed detector bar having a lateral projection extending therefrom, an actuator, a link mounted on the actuator and having a notch for engagement with said lateral pro- ]ection, a locking member mounted on the link and having a portion adapted to extend across the entrance of said notch to retain the lateral projection therein, and manually shiftable means comprising a yieldable blade mounted on the link for movement into and out of locking engagement with the locking member for positively holding said locking member in locking position.

2. In a warp stop mechanism for looms, the combination of drop wires, a transversely movable toothed detector bar having a pin extending therefrom, an actuator, a link pivotally mounted at one end on the actuator and having av notch at its opposite end for engagement with said pin, a locking member movably mounted on said link and provided with a portion adapted to extend across the entrance of said notch to retain the pin therein, and means movable into and out of engagement with said locking member to hold it in the pin engaging position.

3. In a warp stop mechanism for looms, the combination of a series of drop wires, a transversely movable toothed detector bar having a pin extending therefrom, an actuator, a connector between the actuator and toothed detector bar having a notch for engagement with said pin, a locking member mounted on the connector for movement relative thereto into position to block the entrance of said notch to thereby retain the notched portion of the connector in engagement with the pin, and means adapted to engage the connector and locking member and operable to hold the latter in its active position.

4. In a warp stop mechanism for looms, the combination of a series of drop wires, a transversely movable toothed detector bar having a pin extending therefrom, an actuator, a connector between the actuator and toothed detector bar having a notch for engagement with said pin, a locking member mounted on the connector for movement relative thereto into position to block the entrance of said notch to thereby retain the notched portion of the connector in engagement with the pin, means adapted to engage the connector and locking member and operable to hold the latter in its active position, and a projection upon the locking member forming a signal for indicating when the locking member is in its active position.

In testimony whereof, I have signed my name to this specification.

JULIUS E. MCCARVEY.