US3803824A

US3803824A - Mechanical ring rail lowering mechanism

Info

Publication number: US3803824A
Application number: US00273866A
Authority: US
Inventors: B Williamson; A Cutting; R Crossland
Original assignee: Southern Machinery Co
Current assignee: SHERRILL INDUSTRIES Inc A CORP OF NC; Southern Machinery Co
Priority date: 1972-07-21
Filing date: 1972-07-21
Publication date: 1974-04-16
Anticipated expiration: 1991-04-16

Abstract

As a spinning frame ring rail approaches the top of its next-tolast traverse, a mechanical release finger on the rail contacts a relatively fixed mechanical clutch actuator rod and is shifted by the rod to a release position. Responsive to this action, a trip element on the ring rail is shifted by spring force to an active position beneath the clutch actuator rod. On the final up stroke of the ring rail, the trip element engages the clutch actuator rod and releases it from a locking means, allowing the mechanical clutch to be engaged by spring force. A pulley on the clutch output shaft winds up a flexible element which is connected to ring rail support and traversing means, thus lowering the rail to a bobbin doffing position. As the ring rail approaches the doffing position, a striker pin on the trip mechanism engages a lower switch roller and is moved to a position which returns the trip mechanism to the original position. The mechanism may also be used in a semi-automatic mode without the trip mechanism.

Description

United States Patent [1 1 Williamson et al.

[ Apr. 16, 1974 MECHANICAL RING RAIL LOWERING MECHANISM [73] Assignee: Southern Machinery Company,

Greer, S.C.

22 Filed: July 21,1972

21 Appl. No.: 273,866

[52] US. Cl 57/54, 242/26.1, 242/26.4

Primary Examiner-John Petrakes Assistant Examiner-Charles Gorenstein Attorney, Agent, or Firm-B. P. Fishburne, Jr.

57 ABSTRACT As a spinning frame ring rail approaches the top of its next-to-last traverse, a mechanical release finger on the rail contacts a relatively fixed mechanical clutch actuator rod and is shifted by the rod to a release position. Responsive to this action, a trip element on the ring rail is shifted by spring force to an active position beneath the clutch actuator rod. On the final up stroke of the ring rail, the trip element engages the clutch actuator rod and releases it from a locking means, allowing the mechanical clutch to be engaged by spring force. A pulley on the clutch output shaft winds up a flexible element which is connected to ring rail support and traversing means, thus lowering the rail to a bobbin doffing position. As the ring rail approaches the doffing position, a striker pin on the trip mechanism engages a lower switch roller and is moved to a position which returns the trip mechanism to the original position. The mechanism may also be used in a semi-automatic mode without the trip mechanism.

15 Claims, 6 Drawing Figures amaam PATENTEBAPR 16 m4 SHEET 3 BF 4 PAIENTEDAPRIBIBN 3.803.82'

SHEET u or 4 MECHANICAL RING RAIL LOWERING MECHANISM BACKGROUND OF THE INVENTION The present invention has arisen to fill a need for a simplified, economical and reliable, completely mechanical, device for lowering the ring rail of the spinning machine to the doff position at required times. The patented prior art in recent years contains a number of teachings on means for lowering a ring rail but generally such devices have embodied electrical, hydraulic or electromagnetic operating systems which have proven to be unduly expensive and in some instances not completely reliable in operation.

Accordingly, the objective of this invention is to improve upon the prior art pertaining to ring rail lowering devices by the provision of a purely mechanical apparatus which is substantially fool-proof and which may be operated in a fully automaic or semi-automatic mode. The equipment is readily adaptable to most conventional spinning frames now in the field. The apparatus is characterizedby ruggedness and extreme simplicity and ease of installation and maintenance. It employs as its key operating element a very efficient mechanical clutch of a type which employs hardened steel balls, rolling in steel cam tracks, to convert rotary engaging effort into axial thrust on ball bearings. Friction is reduced to a very minimum in the clutch, requiring much less engaging effort than is usually the case with mechanically actuated clutches.

In conjunction with the above very efficient clutch means, the invention employs a simple mechanical trip mechanism which automatically activates the clutch at the proper times and has the ability to return or reset itself automatically for the next cycle of operation of the apparatus following the lowering of the ring rail. The apparatus is also equipped with a manual linkage for the cooling of the clutch and/or the release or activation thereof.

Other features and advantages of the invention will become apparent during the course of the following detailed description.

BRIEF DESCRIPTION OF DRAWING FIGURES FIG. 1 is a fragmentary partly schematic side elevation of a spinning frame equipped with the ring rail lowering mechanism embodying the invention.

FIG. 2 is an enlarged fragmentary elevational view of a trip or release mechanism carried by the ring rail of the spinning frame, partly in section.

FIG. 3 is an elevational view of the ring rail lowering mechanism including a mechanical clutch and its operating linkage as viewed from the head end of the frame, parts in section, the clutch being disengaged.

FIG. 3A is a view similar to FIG. 3 with the clutch shown in the active or engaged position.

FIG. 4 is a central vertical section taken through the ring rail lowering clutch and associated elements, partly in elevation, as viewed from the side of the spinning frame shown in FIG. 1.

FIG. 5 is an elevational view of the trip mechanism on the ring rail as viewed from the end of the ring rail.

DETAILED DESCRIPTION Referring to the drawings in detail, wherein like numerals designate like parts throughout, and in particular referring'to FIG. 1, there is shown a portion of a spinning frame comprising a stationary horizontal spindle rail 20 supported at its opposite ends by upstanding frame ends, the spinning frame head end 21 only being shown in the drawings. A multiplicity of spindles 22 are mounted upon the spindle rail 20 for the support of a like number of bobbins 23 adapted to have yarn 24 wrapped thereon by the conventional operation of the frame. The customary vertically oscillating ring rail 25 guides the yarn onto the bobbins 23 during the gradual building thereof, and this ring rail is supported at plural points therealong by vertically shiftable lifter rods 26 having suitable guided engagement with the spindle rail 20. The ring rail 25 and lifter rods 26 are biased upwardly by lifter arms 27 secured to rocker shafts 28 and having extensions 29 carrying adjustable counterweights 30, or adjustable spring counter-balancing means, in some cases.

The ring rail 25 is continually oscillated vertically during the building of the bobbins by a well-known builder motion 31 mounted upon the spinning frame, as shown. The builder motion continuously coacts with the counterweighted ring rail support and lift means, above-described, to impart to the rail the required up and down movement and gradual elevation to build filling or warp bobbins with a filling wind. In doing this, the builder motion 31 alternately draws in and pays out a flexible chain or cable 32, engaging a pulley 33 supported as shown. The flexible element 32 is attached at its remote end to an arcuate sector 35 carried by the rocker shaft 28, and an extension link 36 connects the sector 35 with a similar sector 35' on the next rocker shaft '28 of the frame, whereby all such sectors will be moved in unison by the coating building motion 31 and counterweights 30. All of the above construction and mode of operation is conventional and need not be further described for a proper understanding of the invention.

Continuing to refer to FIG. 1, the spinning frame further comprises a front draft roll 38 which revolves continuously when the frame is operating and carries at the head end of the frame a gear 38', in mesh with other

conventional gears

39, 40, 41 and 42, the latter gear 42 being directly coupled to an input shaft 43 of a ring rail lowering mechanical clutch assembly designated by the numeral 44.

The clutch assembly 44, FIG. 4, embodies a housing 45 formed in two separable sections, and one end of this housing is bolted securely to the adjacent spinning frame head end 21, as shown. Within the housing 45 is a mechanical clutch 46 of a type manufactured and sold by Formsprag Company, 23601 I-Ioover Rd., Warren. Michigan, designated Type 4, Clutch Model No. CA400. Such a clutch is shown and described in US. Pat. No. 3,127,969 and others. Clutch 46 is per se conventional and it embodies a camming section 46' containing steel balls and cam tracks, not shown, to convert rotary effort into axial thrust movement. Multiple alternating discs 47 and 47' are lugged for driving engagement with a clutch driving cup 48 and with the output shaft of the clutch assembly, to be described. The driving cup 48 is fixedly secured to a driving head 49, pinned at 50 to the clutch input shaft 43 driven by gear 42.

The clutch assembly further comprises at its other end an output shaft 51 having a ring rail lowering pulley 52 mounted thereon exteriorly of the clutch housing and turning therewith whenever the clutch is actively engaged. As stated, the output shaft 51 is keyed to the discs 47' of the clutch and driven thereby when the clutch is engaged. The clutch 46 has radially projecting

tabs

53 and 54, the former tab being anchored to the housing 45 by a roll pin 53', and the latter tab 54 being pivotally connected at 55 to a linkage crank 56, the latter being pivotally connected at 57 to an extension link 58 extending toward the side of the spinning frame. The rear end of link 58 in turn is pivotally connected at 59 to a bell crank lever 60, pivoted at 61 to a fixed support bar 62 on the head end 21 and projecting inwardly therefrom. The bell crank lever 60 includes a handle extension 63, as shown.

A relatively stiff torsion spring 64 has one end extension 65 thereof anchored to the crank arm 60 while the opposite end extension 66 of the spring is anchored to a fixed collar 67 on the fixed post 62. The coils of the spring 64 surrounding this post with adequate clearance. The torsion spring 64 stores sufficient energy which, upon release, causes automatic engagement of the mechanical clutch 46, as will be further described.

The before-mentioned ring rail lowering pulley 52 on the output shaft 51 of the clutch has a chain 68 connected thereto, FIG. 1, engaging around a directional pulley 69 and leading to a sector 71 on the rocker shaft 28, and adjustably attached thereto at 72. Similar sectors 71, etc. are carried by the other rocker shafts 28 of the frame for connection with extension chains 73 of the system, all under control of the clutch operated pulley 52.

The chain 68 is maintained in a taut condition during the normal operation of the builder motion and ring rail by any of several conventional expedients. For example, the ring rail lowering pulley 52 may have associated therewith for this purpose a torsional coil spring such as the spring 68 shown in U.S. Pat. No. 3,124,925. An equivalent conventional arrangement is shown with the torsion spring 81 for pulley 78 in U.S. Pat. No. 3,357,167. If preferred, in lieu of a torsion spring connected with the pulley 52, a retractile coil spring similar to a screen door closing spring may be employed with one of its ends secured to the fixed base rail of the spinning frame and its other end secured to the chain which is fastened to the pulley 52. Either arrangement is satisfactory and either arrangement is well known in the art. The present drawings omit any specific showing of a spring means for this purpose for the sake of simplicity. The torsion spring, if used, is substantially concealed in the hub portion of pulley 52 as shown in said prior patents and need not be illustrated herein.

The invention further embodies a trip or release mechanism mounted on and moving with the ring rail 25 and indicated in its entirety by the numeral 74. This release mechanism consists of a support plate 75 secured adjustably to the ring rail, this plate having slots 77 for the reception of bolt means 78. The mechanism 74 additionally comprises a housing 79 secured adjustably to the support plate 75 by screws 80, the housing serving to support a clutch trip element or arm 81 pivoted at 82 near its bottom between a pair of lugs 83 on the housing 79. The trip element 81 is swingable from the vertical position shown in full lines, FIG. 2, to the inclined or active position shown in broken lines. It is biased toward the active position by a compression spring 84 carried by the housing 79.

- A release finger 85 has its rear end pivoted at 86 to the housing 79 and extends through a slot 87 in the trip element 81 of sufficient size to allow the release finger to have limited vertical movement on its pivot 86 between the full line and broken line positions shown in FIG. 2. The release finger has a locking shoulder 88 on its upper side engageable with the trip element 81 to lock the trip element in the vertical position. The release finger 85 is biased to the horizontal full line locking position by another spring 89 in the housing 79, backed up by a tension adjusting set screw 90. A lower limit switch actuator 91 is secured rigidly at 92 to the bottom of the trip element 81 and extends at right angles thereto and moves therewith about the pivot element 82 between the full and broken line positions shown in FIG. 2. The actuator 91 also serves automatically to reset or restore the mechanism 74 to its original full line position when the ring rail is in the down position for dofiing as will be further described. Movement of the trip element 81 to the broken line position or inclined position is limited by a stop element 93 in the form of a roll pin on the release finger 85. The top surface 94 of the trip element 81 is level when the trip element is in the inclined active position shown in broken lines.

In such active position, the trip element 81 is arranged directly beneath a clutch actuator rod 95 which has a horizontal portion, FIG. 3, and a depending portion 96 whose shape may vary in accordance with the needs of various machines or installations. The actuator rod has a screw-threaded lower extension 97 adjustably secured at 98 to the linkage crank 56 which controls directly the engagement and release of the clutch 44. The rod 95 has a locking notch 99 in its lower side engageable with a fixed locking bracket 100 secured to the roll beam 101 of the spinning frame. The bracket 100 possesses a square detent shoulder 102 which engages one end of the notch 99 to normally position the actuator rod 95 in a locked condition to maintain the clutch 44 released or inactive. Rod 95 is normally held down by a plunger 95' and spring 96, held adjustably by a screw 97'. The rod 95 is lifted at certain times by the active trip element 81 sufficiently to release the notch 99 from the shoulder 102 so that the energy of the torsion spring 64 is released to engage the clutch 44.

Positioned-immediately adjacent to bracket 100 is an upper switch 103 which is held normally closed by contact with the rod 95, FIG. 3, when the latter is in the locked position and the clutch 44 is disengaged. When the switch 103 is closed, the circuit through the spinning frame motor is complete and the spinning frame motor is running. A lower switch 104 having a roller actuator 105 in the path of travel of the element 91 is employed in installations where the apparatus is fully automatic. The lower switch is vertically adjustable on the spinning frame to allow final stopping of the frame after wraps of yarn have been applied to the bottom of the bobbin or to the spindle beneath the bobbin in some cases. In other installations, the lower switch 104 may be omitted entirely, in which case the upper switch 103 alone regulates the stopping of the spinning frame motor, following lifting of the rod 95 by the trip element 81. When the two switches are employed together, they are wired in such a manner that the spinning frame motor continues to operate after the switch 103 is open and does not stop until the lower switch 104 is opened by contact with the element 91, the switch 104 being a normally closed switch.

OPERATION The cycle of operation of the apparatus may be briefly summarized as follows. The trip mechanism 74 is positioned and latched in the full line condition shown in FIG. 2 during the entire traverse of the ring rail for building of bobbins after the ring rail is released from the doff position. As the ring rail 25 approaches its next to final up position adjacent to the tops of the bobbins 24, the release finger 85 will make contact with the bottom of clutch actuator rod 95 and continued upward movement of the ring rail will cause the finger 85 to be depressed by the rod 05 toward the broken line position shown in the drawing. This movement of the finger 85 releases the trip element 81 from its inactive position and the force of spring 84 shifts the element 81 and the finger 85 to the broken line positions and maintains the trip mechanism 74 so positioned or activated.

On the final upward stroke of the ring rail, the top of the trip element 81 is directly under the rod 95 and engages and lifts the rod sufficiently to release the locking notch 99 from the shoulder 102. Upon release of the rod 95 by the action of trip element 81, two'things occur substantially simultaneously. The switch 103 opens the circuit to the spinning frame motor (in the case where only an upper switch is employed) and the spinning frame now begins to coast to a stop. The energy of torsion spring 64 is now released'and through the crank arm 60, link 58 and crank 56 the clutch tab 54'is pulled and turned by the linkage toward the engaged position, as shown in FIG. 3A. As soon as the clutch is engaged, the pulley 52 begins to wind up the chain 68 to lower the ring rail 25 automatically to the down or doff position where the ring rail is locked and held for the doffing operation prior to its release for a new cycle of bobbin building by the frame.

In the normal or preferred situation where the two

switches

103 and 104 are'employed to render the apparatus fully automatic, as the ring rail 25 approaches the doff position, the element 91 will strike the switch actuator roller l05'and open this switch 104 to cut off the spinning rail motor. Wherethe two switches are employed, the opening of the upper switch 103 alone ,will not shut off the spinning frame motor and the opening of both switches is required to accomplish this. Simultaneously, with the opening of the lower switch 104, the element 91- is returned by the roller 105 to the full line horizontal position in FIG. 2, thus resetting or restoring the trip mechanism 74 to the inactive position shown in full lines, and ready for the next bobbin building cycle of the spinning frame. The lower switch 104 is vertically adjustable so that control of the yarn wraps on the bottom of the bobbin or on the spindle below the bobbin can be attained as desired.

When the apparatus for lowering the ring rail is employed in a manual mode, the trip mechanism 74 and the lower switch 104 are omitted, together with all components shown in FIG. 3 which are to the left-hand side of the crank 56. For random doffing, the doffer utilizing the handle 63 cocks the lever 60 when the stop button on the spinning frame is pressed. The mechanical clutch is engaged and the ring rail is lowered by the coasting frame in direct proportion to front draft roll delivery and locks in the doff position. The rail is later released from the doff position by tripping the cocking lever 60. Therefore, in effect, when used manually, the operator merely employs the handle or lever 63 to engage or disengage the mechanical clutch at the proper times. The torsion spring 64 associated with the clutch operating linkage is also dispensed with in the manual mode of operation.

It should be mentioned additionally that the clutch 44 is an automatic override or slip clutch which is designed to slip under a predetermined torque loading. This will prevent stripping of teeth or other damage to the clutch or related components as sometimes occurs with competitive prior art systems. With the invention clutch, there is actually no necessity for latch means to hold the ring rail down in the doff position as the clutch itself will serve this function. In prior art competitive systems, if the mechanism doesnt operate in the correct manner, stripping of teeth or similar damage will I frequently occur. On the other hand, if the system works correctly, there will be a need for latches to hold the ring rail in the down position. Thus, the present clutch arrangement incorporates these additional improvement features over the known prior art.

It may now be seen that a simple and reliable mechanical arrangement for lowering the ring rail is provided for fully automatic or semi-automatic operation. The apparatus is adaptable -to most conventional frames. The use of hydraulic devices and electrical or electromagnetic clutches with their inherent problems is completely avoided. The advantages of the invention should now be readily apparent to those skilled in the art without the necessity for a further description herein.

It is to be understood that the form of the invention herewith shown and described is to be taken as a preferred example of the same, and that various changes in the shape, size and arrangement of parts may be resorted to, withoutdeparting from the spirit of the invention or scope of the subjoined claims.

We claim:

1. In a spinning frame of the movable ring rail type, a mechanical ring rail lowering mechanism, said mechanism comprising a mechanical clutch mounted on the spinning frame head end and having input and output shafts' and a rotary clutch activating and deactivating component including a projecting tab, spinning frame gearing connected with and driving the clutch input 7 shaft in direct proportion to the rotational speed of the spinning frame front draft roll, a pulley carried by the clutch output shaft, a flexible element windable upon said pulley to effect lowering of the ring rail when the clutch is engaged, said flexible element being connected with ring rail supporting and oscillating means of the spinning frame, a clutch operating linkage on the spinning frame having a connection with said projecting tab of the clutch and being spring-biased in a direction to activate the clutch when the spring energy is released, a releasable latching means for said linkage on the spinning frame to hold the linkage and said projecting tab in a clutch deactivating position, a linkage release mechanism mounted on the ring rail and movable therewith including a linkage trip element which engages the linkage and releases it from the latching means on the final upstroke of the ring rail thereby enabling the spring-biased linkage to move said projecting tab to a clutch activating position for lowering the ring rail, and electrical switch means on the spinning frame operated by the tripping and releasing of said linkage to shut off the spinning frame motor so that the frame will coast to a stop during lowering of the ring rail.

2. The structure of claim 1, and said linkage release mechanism mounted on the ring rail comprising a release finger adapted to contact said linkage during the penultimate up stroke of the ring rail, said finger being forced downwardly by contact with said linkage to release said trip element for movement to a position where the trip element will contact the bottom of the linkage on the final upstroke of the ring rail, said finger serving as a latch to maintain the trip element in an inactive position relative to the linkage prior to engagement of the finger with said linkage.

3. The structure of claim 2, and said release mechanism further comprising a spring urging said finger toward a normal position where the finger is latching the trip element in the inactive position of the trip element, a second spring urging the trip clement toward its active position with relation to the linkage, a stop element on the finger engageable with the trip element to position it in the active position, and a projecting part on the trip element operable to return the trip element automatically to its inactive position and to cause latching of the trip element by said finger in such position when the ring rail approaches a full down position, said projecting part then contacting a relatively stationary part on the spinning frame which causes movement of the projecting part in a proper direction to reset said linkage release mechanism.

4. The structure of claim 3, and said release mechanism further comprising a housing attached to the ring rail for adjustment vertically and horizontally thereon, said finger pivoted to the housing for vertically swinging movement, said trip element and said projecting part forming a unit pivoted to the housing, and said finger having a locking shoulder engaging the trip element to hold the latter in its inactive position with relation to Said linkage.

5. The structure of claim 3, and said relatively stationary part on the spinning frame comprising the actuator element of a lower electrical switch on the frame forming a part of said switch means.

6. The structure of claim 5, and said switch means further comprising an upper switch fixedly mounted on the frame immediately below said linkage and being engaged by the linkage when the linkage is latched in the clutch deactivating position, the upper switch then maintaining an electrical circuit through the spinning frame motor to cause the motor to operate, the upper switch deactivating the spinning frame motor circuit when the linkage is engaged by said trip element and released for movement to the clutch activating position.

7. The structure of claim 6, and said lower electrical switch being electrically connected to the upper switch in such a way that the spinning frame motor will continue to operate until said projecting part on the trip element contacts the actuator element of the lower switch to open the lower switch, the lower switch being normally closed, and the upper switch being a normally closed switch.

8. The structure of claim 1, and said releasable latching means for said linkage comprising a linkage rod having a locking notch in its lower side, a guide element for said linkage rod on the spinning frame having a locking shoulder engageable with said notch, said rod being liftable with relation to said shoulder by said trip element to release said linkage for movement to said clutch activating position, and resilient means bearing down on said rod and yieldably maintaining said notch engaged with said shoulder.

9. The structure of claim 8, and said clutch operating linkage further comprising a crank element on said rod pivoted to said projecting tab, a pull link pivoted to said crank element, and a crank lever pivoted to the spinning frame and pivotally attached to said pull link.

10. The structure of claim 9, and a biasing spring for said linkage connected with said crank lever and urging the lever to turn in one direction on its pivot.

11. The structure of claim 10, and said spring comprising a torsion coil spring on the pivot of said crank lever.

12. A spinning frame ring rail lowering mechanism comprising a mechanical clutch mountable upon a fixed part of a spinning frame and having an input rotary shaft adapted to be driven by a constantly rotating element of the spinning frame, said clutch having an output rotary shaft carrying a pulley having a flexible element windable thereon to lower the ring rail of a spinning frame when the clutch is engaged, the clutch including a rotary component which must be turned in one direction to engage the clutch and in an opposite direction to disengage the clutch, a clutch operating linkage including a pivoted operating lever and a linkage part connected with said rotary component, spring means connected with said linkage and biasing it in a direction to engage said clutch by rotary movement of the component to effect lowering of a ring rail, and releasable locking means on the spinning frame to hold the linkage in a position with said component where the clutch is disengaged and said clutch output shaft is stationary during continued rotation of said input shaft.

13. The structure of claim 12, and a linkage release means mountable upon a spinning frame ring rail and engageable with said linkage in a full up position of the ring rail to unlock the linkage so that the latter will activate the clutch automatically under influence of said spring means.

14. The structure of claim 13, and electrical switch means contacting said linkage and operated by the unlocking of the linkage to open a spinning frame drive motor circuit and stop the drive motor so that the frame is coasting to a stop while the ring rail is being lowered to a doff position responsive to engagement of said clutch.

15. The structure of claim 14, and said linkage release means including a movable trip element, and means engageable with said trip element as the ring rail approaches a doff position to automatically reset the trip element in preparation for a new bobbin building cycle.

t i l 4

Claims

1. In a spinning frame of the movable ring rail type, a mechanical ring rail lowering mechanism, said mechanism comprising a mechanical clutch mounted on the spinning frame head end and having input and output shafts and a rotary clutch activating and deactivating component including a projecting tab, spinning frame gearing connected with and driving the clutch input shaft in direct proportion to the rotational speed of the spinning frame front draft roll, a pulley carried by the clutch output shaft, a flexible element windable upon said pulley to effect lowering of the ring rail when the clutch is engaged, said flexible element being connected with ring rail supporting and oscillating means of the spinning frame, a clutch operating linkage on the spinning frame having a connection with said projecting tab of the clutch and being spring-biased in a direction to activate the clutch when the spring energy is released, a releasable latching means for said linkage on the spinning frame to hold the linkage and said projecting tab in a clutch deactivating position, a linkage release mechanism mounted on the ring rail and movable therewith including a linkage trip element which engages the linkage and releases it from the latching means on the final upstroke of the ring rail thereby enabling the spring-biased linkage to move said projecting tab to a clutch activating position for lowering the ring rail, and electrical switch means on the spinning frame operated by the tripping and releasing of said linkage to shut off the spinning frame motor so that the frame will coast to a stop during lowering of the ring rail.

3. The structure of claim 2, and said release mechanism further comprising a spring urging said finger toward a normal position where the finger is latching the trip element in the inactive position of the trip element, a second spring urging the trip element toward its active position with relation to the linkage, a stop element on the finger engageable with the trip element to position it in the active position, and a projecting part on the trip element operable to return the trip element automatically to its inactive position and to cause latching of the trip element by said finger in such position when the ring rail approaches a full down position, said projecting part then contacting a relatively stationary part on the spinning frame which causes movement of the projecting part in a proper direction to reset said linkage release mechanism.