US3321897A

US3321897A - Spindle protection device

Info

Publication number: US3321897A
Application number: US387353A
Authority: US
Inventors: John A Cugini; Haagsma Herman
Original assignee: Draper Corp
Current assignee: Draper Corp
Priority date: 1964-08-04
Filing date: 1964-08-04
Publication date: 1967-05-30
Anticipated expiration: 1984-05-30

Description

May 1967 J. A. cusm: ETAL.

SPINDLE PROTECTION DEVICE 5 Sheets-Sheet l Filed Aug.

INVENTORS' JUHN FLCUfiEiNI.

BY HERMAN HHAGSMQ.

Q/F/M A T TORNEV A TTORNE Y J. A. CUGINI ETAL SPINDLE PROTECTION DEVICE 5 Sheets-Sheet 2 n M L %H C. m Wm @M m QM Q May 30, 1967 Filed Aug. 4, 1964 SPINDLE PROTECTION DEVICE Filed Aug. 4, 1964 5 Sheets-Sheet 5 a sa In q 3 57 -25 w J -mw INVENTORS JOHN HCUGINI, BY HEFZP'IHN HHHGSPM.

A TTORNE Y May 30, 1967 J. A. CUGINI ETAL 3,321,897

SPINDLE PROTECTION DEVICE Filed Aug. 4, 1964 5 Sheets-Sheet 4 INVENTORS JOHN ACumm. BY HERMAN Hnessma.

QM QM A TTORNE Y y 30, 1967 .1. A. CUGINI ETAL 3,321,897

SPINDLE PROTECTION DEVICE Filed Aug. 4, 1964 5 Sheets-Sheet 5 25 INVENTORS Joumncuemr. BY HERMAN HHHGSMA.

' ATTORNEY United States Patent Ofiiice 3,321,897 SPINDILE PROTECTION DEVICE John A. Cugini, Hopetiale, and Herman Haagsma, Whitinsville, Mass, assignors to Draper Corporation, Hopeilale, Mass, a corporation of Maine Filed Aug. 4, 1964, Ser. No. 387,353 4 Claims. (Cl. 57-53) This invention pertains to a combined donning and dofling machine adapted to impale and dotf bobbins from a row of spindles supported on a spinning frame and, more particularly, the invention relates to a spindle protection device.

It is a general object of the invention to provide a means of preventing damage to spindles by the donning unit in the event of a dofling miss.

A further object is to provide a spindle protection device which is elfective in inactivating the donning mechanism should a wound bobbin fail to be dolfed from its respective spindle.

A still further object is that of providing a spindle protection device having a positive indicating means for detecting the presence of an undolred wound bobbin with a cooperating mechanism for instantly discontinuing further donning and to withdraw the donning mechanism to an inactive position.

Further objects and advantages of the invention will become apparent from the following more detailed disclosure.

The present invention is applicable to a dofiing and donning machine such as that disclosed in US. Patent No. 3,077,725 and since this patent may be referred to for a more detailed description of such a machine, it is considered unnecessary at this point to insert herein the details of the general aspects of construction and operation of this unit.

This dofling and donning machine as disclosed in the above patent is adapted to be mounted by rollers on a rail fixed to a spinning frame and is designed to move along and in close proximity with a row of spindles supported by said spinning frame. The machine includes adiacent-ly situated and vertically disposed dofiing and donning mechanisms which are individually movable in a lateral direction to and away from operating position. When these mechanisms are in operating position and the machine is being moved along the rail of the spinning frame, the wound or full bobbins are first doffed from their respective spindles and the donning mechanism being adjacently disposed on said machine is brought into operation by continued movement of the machine to don or impale empty bobbins on those spindles from which the dofiing mechanism had removed the full bobbins.

Until the introduction of the instant invention, upon any malfunction of the dotting mechanism such as failure to remove a wound bobbin from its spindle, the bobbin, when encountered by the donning mechanism, created a jamming condition resulting oftentimes in a bent and damaged spindle.

The donning mechanism when in operating position is disposed above the row of spindles with only suificient clearance between the top of the dotfed spindles and said mechanism to permit uninterrupted advancement of the machine along the spinning frame. This limited amount of clearance between the spindle and the donning mechanism will cause the upper portion of an undolfed bobbin to come into contact with the donning mechanism there by creating the undesirable condition described above.

The spindle protection device according to the instant invention eliminates the possibility of such a condition by automatically retracting the donning mechanism when a full bobbin fails to be dotted.

The device includes a pivotable indicating lever so disposed as to be actuated by the yarn package on an un- 3 ,32 1 9 7 Patented May 30, 1967 dofled bobbin. When the indicating lever detects an undolfed bobbin, it is caused to pivot and the opposite end thereof acts upon a donning release cam which through interconnecting linkage therewith releases the means by which the donning mechanism is maintained in operating position.

The donning mechanism is supported by a vertically disposed slide plate which is selectively movable to place said mechanism in operating position and to retract the same to an inactive position. This slide plate is spring biased in the direction of the donning mechanisms inoperative position, and it is maintained in operating position by means of a spirng biased lat-ch pawl which is adapted to seat in a recess provided on the lower side of said slide plate. The configuration of this recess conforms to the shape of the latch pawl. Upon indication of an undoffed bobbin, the linkage interconnected with the donning release cam causes the latch pawl to pivot out of its recess and the slide plate being spring biased as described automatically retracts the complete donning mechanism to an inactive position.

The invention will be described in greater detail in the following disclosure wherein reference is made to the accompanying figures of drawing, in which:

FIG. 1 is a perspective view depicting only so much of the donning and dofling machines structure as is necessary to a full understanding of the invention, with the spindle protection device according to the invention applied thereto and in extended or operating position;

FIG. 2 is a view similar to that of FIG. 1 but showing the donning mechanism and the spindle protection device withdrawn to an inactive position;

FIG. 3 is a plan view and partially in section of the the latching mechanism utilized to maintain the donning mechanism in operating position and for releasing the same to an inoperative position;

FIG. 4 is an end view in elevation of the latching mechanism illustrated in FIG. 3 showing by means of full and phantom lines the position of the slide plate when the donning mechanism is in operating position and when retracted to an inactive position;

FIG. 5 is an end view of the lower portion of the donning mechanism slide plate showing the means utilized to guide the same to and from operating position;

FIG. 6 is a side view and partially in section of the pivotable spring biased latching pawl for maintaining the sliding plate in an extended position and for releasing the same therefrom;

FIG. 7 is a sectional view of the upper portion of the manual donning release rod and a portion of the supporting structure therefor as seen looking in the direction of the indicating arrows line 77 in FIG. 8;

FIG. 8 is a plan view of the release rod in FIG. 7 but showing more of said rods supporting means;

FIG. 9 is a perspective view of a modification of the invention showing a pivotable indicating lever in operating position with one end thereof in contact with the latching mechanism for maintaining the donning mechanism in and releasing the same from operating position;

FIG. 10 is a view similar to that of FIG. 9 but showing the donning slide plate withdrawn to an inactive position;

FIG. 11 is a view in side elevation of a portion of the latching mechanism illustrated in FIGS. 9 and 10 showing the guiding and supporting means for the sliding plate and its relationship to said latching mechanism; and

FIG. 12 is a sectional view as seen looking in the direction of the indicating arrows of line 12-12 in FIG. 11 showing the pivotable spring biased latching pawl for holding the slide plate in an extended position and to release the same therefrom.

Referring now to the figures of drawing, enough of a combined donning and dofiing machine has been illus- J trated in FIGS. 1 and 2 to serve as a basis for a detailed description of the invention applied thereto. 1

The supporting framework is indicated generally by numeral and includes rollers 21 (one only shown in FIGS. 1 and 2) which serve as a means for mounting the machine on the rail of a spinning frame and for moving the same along said frame and in close proximity with the row of spindles supported thereby.

Supported above the framework a carriage 22 extends longitudinally for a portion of the length of the machine and is provided at one end thereof with an upwardly directed extension 23. The bobbin conveyor chains (not shown) move horizontally in a known manner within the confines of the carriage 22, thence upwardly within the extension 23 to feed empty bobbins 24 carried by said chains to the machines donning mechanism generally indicated by numeral 25.

The donning mechanism, being disposed at one end of the machine, is carried on a vertical plate 26 slidable on the end face member 27 of the upwardly directed extension 23 of the carriage 22. This plate 26 is slidable from a retracted position (FIG. 2) to a projected position (FIG. 1) in which the donning mechanism holds a bobbin in a position directly above the particular spindle (not shown) to which the bobbin is to be applied. The vertical plate 26 when in a projected position as depicted in FIG. 1, is maintained in this position by a latching mechanism generally indicated by numeral 28. A coil spring member 29 having one end attached to the vertical plate as at 30 and the opposite end (not shown) being suitably attached to the end face member 27, continually urges said vertical plate to its retracted position. The release of the latching mechanism, which will be more fully described hereinafter, allows spring 29 to retract and in so doing withdraws the vertical plate 26 and the donning mechanism supported thereby to an inactive and withdrawn position.

The latching mechanism includes a latch-out block 31 which is attached to a horizontally disposed portion of the supporting frame-work by cap screw 32 (FIG. 3). A horizontally disposed and longitudinally extending shaft member 33 assembles within the latch-out block 31 and extending from opposite ends thereof, the ends support fixedly attached members to be more fully described that are instrumental in transmitting the required motion to release the donning mechanism for retraction to an inactive position. This shaft being oscillatable is supported by aligned anti-friction bearings 34- and 35 provided within and at the ends of the block from which said shaft extends (FIG. 3). That end of shaft 33 nearest the donning mechanism, which as seen in FIGS. 1, 2, and 3, is that on the left, supports a double armed lever generally indicated by numeral 36. A first arm 37 of lever 36 is bifurcated to support therein a roller 38 which is engageable with a vertically disposed plunger 39. Plunger 39 is actuated by a rail-mounted cam member (not shown) to release automatically the donning mechanism as the machine passes the last spindle and leaves the rail of the spinning frame.

The second arm 40 (FIGS. 3 and 4) is generally fanshaped and of reduced thickness compared to the first arm 37 and the outer edge thereof is provided with a recess 41 (FIG. 4) which serves as a means for maintaining the latching means (that will be described more fully hereinafter) in a position for keeping the vertical plate 26 in a projected position. The remaining portion of the outer edge of the second arm 40 is arcuated as at 42 and provides a camming surface to release the latching means when the lever 36 is caused to pivot in an anti-clockwise direction. The latchng means referred to above is housed within the latch-out block 31 which is provided with a recess 43 (FIG. 3) on the inner side of the block or, in other words, that side most remote from the row of spindles. This recess, being disposed adjacent the center of the inner side of the block and extending inwardly for a portion of the blocks width, is adapted to receive a pivotable latching pawl 44. This pawl is fixedly attached to and pivots with a pawl shaft 45 the latter of which is journaled in a longitudinally extending aperture adjacent the inner side of the block 31 and which passes through the recess 43. Pawl shaft 45 protrudes from that end of the latch-out block 31 nearest the donning mechanism and it supports a fixedly attached lever arm 46 at that end. This lever arm extends in the direction of lever 36 and is provided adjacent its free end with a laterally extending pin member 47 having a rotatable roll member 48 assembled thereon. A coil spring 49 having one end attached to pin member 47 and the opposite end attached to lever 36 as at 50 (FIG. 4) serves as a means for maintaining roll member 48 in constant contact with the second arm 40 of the double armed lever 36. When lever 36 is in that position depicted in FIG. 4, the latch pawl 44 is in a horizontal position and a latching tooth 51 provided on the latter is seated in a conforming recess 52 provided on the underside of a latch-out bracket 53 that is attached to the lower edge of the vertical plate 26. Additionally, when the lever is in this position, the roll member 48 is partially drawn by spring 49 into the recess 41 provided on the second arm 46 of lever 36. Upon an indication to release the donning mechanism, shaft 33 is caused, by a means to be described hereinafter, to turn in the direction of the indicating arrow shown in FIG. 4. This movement moves lever 36 in a like direction forcing lever arm 46 downwardly so that roll member 48 is forced out of recess 41 and caused to ride on the arcuated surface 42 on the second arm 40 of lever 36.

The forcing of lever arm 46 downwardly pivots pawl shaft 45 in a clockwise direction thereby moving the latching pawl 44 to that position shown in FIG. 6 which permits the retraction of coil spring 29 and the withdrawal of the vertical plate 26 and the donning mecha nism attached thereto to an inactive position.

Continuous with the recess 43 a guiding channel 54 is provided on the upper portion of the latch-out block and serves as a guide for the latch-out bracket 53 to keep the plate 26 in general vertical alignment when in a projected position.

FIG. 5 illustrates the means utilized to attach the latchout bracket 53 to be underside of the plate 26 and includes a mounting bracket generally indicated by numeral 55 having a horizontally disposed base portion 56 and an upwardly directed slotted portion 57 which attaches as shown in FIGS. 4 and S to the lower edge of plate 26 by means of cap screws 58.

A pair of stepped

channel plates

59 and 60 assemble in spaced relation to the underside of the base portion 56 and forms a guiding channel between said plates for assembly of the latch-out bracket 53. This latch-out bracket when projected with the vertical plate 26 moves to a predetermined position in channel 54 where it is caused to come into contact with a stop member 61. This stop memher is made of a Wear resistant material and assembles by means of cap screws 62 in a longitudinally extending channel 63 disposed adjacent that side of the latch-out block opposite that side of said block at which recess 43 is formed. The latch-out bracket 53 is adjustable within the channel formed by

plates

59 and 60 and serves as a means whereby the donning mechanism which is supported on plate 26 may be adjusted to obtain the desired alignment with the spindles with which it cooperates during its intended function. This adjustment feature includes an adjustment screw 64 that is supported intermediate its ends by a depending support member 65 the upper portion of which attaches to the lower side of plate 26 by means of cap screws 66. Adjusting screw 64 is provided with

lock nuts

67 and 68 which "are adapted to be tightened against the depending support member 65 to maintain the plate 26 in its required setting. To advance or withdraw the plate and donning mechanism for adjustment purposes, lock

nuts

67 and 68 are loosened and turning of the adjustment screw, one end of which is rotatably attached to the latch-out bracket 53, will cause the latter to slide in one direction or the other within the channel formed by

plates

59 and 60. Retightening of the lock nuts will maintain the changed setting and when plate 26 is again projected, the latch-out bracket will still come into contact with the stop member 61, but the position of said plate and donning mechanism with respect to the spindles is affected by this adjustment means.

Now there will be described the means by which the latching device is actuated to release and permit the withdrawal of the donning mechanism to an inactive position.

That portion of the horizontally disposed and longitudinally extending shaft member 33 which protrudes from that end of the latch-out block 31 furthest from the donning mechanism utilizes a pillow block 69 as an additional means for supporting and guiding this portion of said shaft 33 (FIGS. 1, 2, and 3). The shaft extends a short distance beyond the confining limits of the pillow block 69 and is provided on this end with a lever arm '70. This lever arm is fixedly attached to the end of shaft 33 and, extending angularly upwardly, the opposite end thereof is pivotably attached to a vertically disposed release rod 71 as at 72. Release rod 71 is maintained in a vertical position by a guiding means generally indicated by numeral 73 disposed adjacent the upper end of said rod. This guiding means includes a bifurcated crank arm 74, the bifurcated portion of which supports a horizontally disposed bushing 75 (FIGS. 7 and 8) through which the upper portion of the release rod 71 is adapted to extend. The opposite end of crank arm 74 is fixedly attached to one end of a crank lever shaft 76, the major portion of which is supported 'by and journaled in a lever shaft housing 77. This lever shaft housing extends laterally from and is attached to the end face member 27 of the upwardly directed extension 23. Lever shaft 76 extends through the end face member and is provided on that end with a generally vertically disposed vertical plate crank lever 78 (partially shown in FIGS. 1 and 2). The upper end of this crank lever (not shown) is pivotally attached to the vertical plate 26 and when the latter is projected to operating position, the upper portion of said crank lever moves with said plate thereby pivoting the crank lever shaft 76 in a direction that causes the bifurcated portion of the crank arm 74 to pivot upwardly. That portion of the release rod 71 which extends above bushing 75 is threaded as at 79 having a hex nut 80 and washer 81 assembled thereon with a coil spring 82 disposed intermediate said washer and said bushing. The upward movement of the crank arm 74 also pulls the release rod 71 in an upwardly direction and the latter being interconnected with the latching mechanism causes shaft member 33 to turn in a direction whereby the latching pawl 44 pivots to the required position for maintaining plate 26 in a projected position.

The top of the release rod 71 is provided with a knob 83 and by simply pushing said knob and rod downwardly will cause shaft member 33 to move in the opposite direction and being interconnected with the latching pawl 44, the latter is caused to pivot to that position shown in FIG. 6 whereby the vertical plate 26 and donning mechanism are retracted to an inactive position. The means utilized to release the vertical plate 26 and the donning mechanism automatically, includes an indicating lever generally indicated by numeral 84 having a bobbin package engaging sunface 85 and a cam engaging surface 86 integral with and extending from said surface 85 (FIGS. 1 and 2). This indicating lever is provided with a hub 87 which by means of an integrally formed web 88 forms the com plete indicating lever. The indicating lever is mounted for pivotable movement on a vertically disposed stud 89, the latter being fixedly attached to a lever support member 90. The support member is assembled by means of cap screws 91 to the lower side of the vertical plate 26 as at 92. A release rod cam 93 assembles on the release rod 71 and is secured thereto by means of screws 94.

6 This cam includes a camming surface 95 inclined from the horizontal which is maintained in close proximity with the cam engaging surface 86 of the indicating lever (FIG. 1) when the vertical plate 26 is in a projected or donning operating position.

The donning and dofiing machine when performing its intended function is moving along the rail of a spinning frame in the direction of the indicating arrow A depicted in FIGS. 1 and 2. While performing its intended function, the vertical plate 26 is in the projected position shown in FIG. 1. When moving along the rail in this position, the package engaging surface of the indicating lever will not contact the spindles from which the wound bobbins have been doifed; however, in the event of a dofiing miss said engaging surface will contact the yarn package of this particular bobbin and through continued movement of the machine the indicating lever 84 is caused to pivot in a clockwise direction as seen looking from the top thereof. Movement of the indicating lever in this manner forces the cam engaging surface 86 thereof across the camming surface of the release rod cam 93 pushing the same and the release rod 71 downwardly. As described above the downward movement of the release rod actuates the latching mechanism to pivot the latching pawl downwardly to release the vertical plate 26 thereby permitting retraction of spring 29 and the withdrawal of said plate to an inactive position.

A modification of the invention is illustrated in FIGS. 9, l0, l1, and 12 which includes a latch-out block generally indicated by numeral 96 and like latch-out block 28 includes a horizontally disposed shaft member depicted by numeral 97. This block assembles in the same location on the supporting frame as block 28 and is provided with a centrally disposed recess 98 extending from that side of the block adjacent the donning mechanisms operating position inwardly for a portion of said blocks width. Shaft member 97 extends through recess 98 and is journaled in aligned apertures provided in that portion of the block which forms the sides of said recess.

A latching pawl 99 assembles on shaft 97 within the confines of recess 98 and being fixedly attached to said shaft it is movable with it to hold the vertical plate 26 in a projected position or to release the same therefrom. This latching pawl is provided with a latching tooth 1011 which when in locking position is adapted to seat in a recess of conforming configuration provided in a latch-out bracket 161 (FIG. 12). The latch-out bracket is attached to the lower edge of the vertical plate 26 as is latch-out bracket 53 and is slidably adjustable in a like manner for adjusting said plate and donning mechanism with respect to the spindles with which said mechanism is adapted to cooperate.

A coil spring 102 (FIG. 12) assembles beneath the latch pawl 99 with one end thereof seated in a recess 163 provided on the underside of said pawl with. the opposite end of said spring being seated in a similar aligned recess provided in the supporting frame. Spring 1112 is continually urging the pawl to a latching horizontal position as shown in FIG. 12 and when the latch-out bracket is in this position, it is caused to contact a stop member 1114 similar to and for a like purpose of the stop member 61 utilized on block 28.

Now to describe the means by which shaft 97 is actuated to release the plate 26 for withdrawal to an inactive position. This shaft extends outwardly from each end of the latch-out block 96 and like shaft 33 it supports adjacent one end a bifurcated lever member 194 which is adapted to support a roller 105 therebetween. Roller 105 is used for the same purpose as roller 38 to release the donning mechanism as the machine completes its intended function.

This end of shaft 97 also supports a collar 106 and being fixedly attached thereto, it is provided with an upwardly directed lever pin 107 (FIG. 10) which is utilized for manual release of the latching pawl 99.

The opposite end of shaft 97 has a lever arm 108 secured thereto that is directed in a generally upward direction as shown in FIGS. 9 and 10. The upper portion of this lever arm is of reduced thickness as at 109 and is adapted to be engaged at this portion of said arm by a pivotal indicating lever generally indicated by numeral 110. This indicating lever is in the form of a bell crank lever having a supporting hub portion 111, a first arm 112 in the form of a camming surface to be engaged by the yarn package of an undoffed bobbin and a second arm 113 the end of which is adapted to contact the upper portion of the lever arm 108. The indicating lever is attached for pivotable movement to the side of the vertical plate 26 as at 114 by means of a positioning spacer 115, bolt 116 with washers, and a retaining nut 117 and 118, respectively.

In operation, the modification functions in a very similar manner to the spindle protection device first described. The machine when moving along the rail of a spinning frame is moving in the direction of the indicating arrows B in FIGS. 9 and 10 and the wound bobbins are first doffed from their respective spindles by the doffing mechanism and then empty bobbins are impaled on these spindles by means fully described in the aforementioned patent. The protection device according to the invention is disposed intermediate the dofling and donning units and functions to detect wound bobbins remaining on the spindles after passing the doifing mechanism.

FIG. 9 shows the indicating lever in operating position. The first arm 112 is so disposed as not to contact the empty spindles as it moves past them; however, should there be a doffing miss and a wound bobbin remains on one of the spindles, the curved or camming surface of arm 112 will contact the yarn package of this Particular bobbin. Continued movement of the machine will cause the indicating lever to pivot in the direction of the indicating arrow C in FIG. 9 causing the second arm 113 thereof to pivot lever arm 108 in a clockwise direction. This motion actuates shaft 97 and the latch-out pawl 99 being fixedly attached thereto pivots downwardly to release the vertioal plate 26. Retraction of coil spring 29 then withdraws this plate and the donning mechanism attached thereto to a retracted and inactive position.

While one embodiment and a modification of the invention have 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 be limited to the precise details described, but is intended to embrace all variations and modifications thereof falling within the spirit of the invention and the scope of the claims.

We claim:

1. For a machine adapted to move along a spinning frame having mechanisms for donning empty bobbins on and doffing wound bobbins from a row of spindles supported by said spinning frame, a spindle protection device including a pivotable bobbin indicating lever adapted to be activated by the presence of an undoffed wound bobbin and a means functioning in conjunction with said pivotable indicating lever to release the donning mechanism with a further means cooperating with the latter to withdraw the same to an inactive position.

2. For a machine adapted to move along a spinning frame having mechanisms for donning empty bobbins on and doifing wound bobbins from a row of spindles supported said spinning frame, a spindle protection device including a pivotable bobbin indicating lever adapted to be activated by the presence of an undoifed wound bobbin and a means functioning in conjunction with said pivotable indicating lever to release the donning mechanism, said means including interconnected cam and linkage members and spring members acting upon the donning mechanism for withdrawing the same to an inactive position when the latter is released by said cam and linkage members.

3. For a machine adapted to move along a spinning frame having mechanisms for donning empty bobbins on and doffing wound bobbins from a row of spindles supported by said spinning frame, a spindle protection device including a pivotable bobbin indicating lever, a latching means for maintaining the donning mechanism in operating position, said indicating lever being adapted to cooperate with said latching means to release said donning mechanism when said lever is encountered by an undoffed wound bobbin, said latching means including a shaft and latching pawl affixed thereto, a lever arm fixedly attached to one end of said shaft and adapted to cooperate with said indicating lever to actuate said latching pawl.

4. The structure of claim 3 wherein said latching means includes a means affixed to said shaft for manual actuation of said latching pawl.

References Cited UNITED STATES PATENTS 3,103,096 9/1963 Prat 57-53 3,154,909 11/1964- Urano et al. 5753 FRANK I. COHEN, Primary Examiner.

A. J. SIDOTI, I. PETRAKES, Assistant Examiners.

Claims

1. FOR A MACHINE ADAPTED TO MOVE ALONG A SPINNING FRAMED HAVING MECHANISMS FOR DONNING EMPTY BOBBINS ON AND DOFFING WOUND BOBBINS FORM A ROW OF SPINDLES SUPPORTED BY SAID SPINNING FRAME, A SPINDLE PROTECTION DEVICE INCLUDING A PIVOTABLE BOBBIN INDICATING LEVER ADAPTED TO BE ACTIVATED BY THE PRESENCE OF AN UNDOFFED WOUND BOBBIN AND A MEANS FUNCTIONING IN CONJUNCTION WITH SAID PIVOTABLE INDICATING LEVER TO RELEASE THE DONNING MECHANISM WITH A FURTHER MEANS COOPERATING WITH THE LATTER TO WITHDRAW THE SAME TO AN INACTIVE POSITION.