US2315936A

US2315936A - Top roll loading device

Info

Publication number: US2315936A
Application number: US425416A
Authority: US
Inventors: Leland D Cobb
Original assignee: Motors Liquidation Co
Current assignee: Motors Liquidation Co
Priority date: 1942-01-02
Filing date: 1942-01-02
Publication date: 1943-04-06
Anticipated expiration: 1960-04-06

Description

April 6, 1943. 1.. D. COBB TOP ROLL LOADING DEVICE Filed Jan. 2, 1942 2 Sheets-Sheet 1 :5 lNve/vrola; LELAND D. COBB.

i HIS ATTORNFY April 4 L. D. COBB 2,315,936

TOP ROLL LOADING DEVICE I FiledJan. 2, 1942 2 Sheets-Sheet 2 IIIIIIIIIIIIII /NVEN7'OR; LELAND 0. C055.

HIS ATTORNEY Patented Apr. 6, 1943 TOP ROLL LOADING DEVICE Leland D. Cobb, Forestville, Conn, assignor to General Motors Corporation, Detroit, Mich., a

corporation of Delaware Application January 2, 1942, Serial No. 425,416

20 Claims.

This invention relates to top roll loading devices as used in drawing, roving, spinning and other textile machines, and particularly to a pressure applying mechanism for distributing downward pressures to a plurality of top rolls.

An object of this invention is to provide an improved and simplified device for applying and distributing pressures to a plurality of top rolls. A further object is to provide a pressure applying mechanism for a plurality of top rolls and which distributes a loading pressure to the end portions of one top roll and to the central portions of the other top rolls. Another object is to provide a loading mechanism and top roll construction wherein rotatable friction is eliminated between the loading mechanism and the top rolls.

To these ends and also to improve generally upon devices of the character indicated, the invention consists in the various matters hereinafter described and claimed.

, In the accompanying drawings:

Figure l is a fragmentary perspective view showing the application of my pressure loading mechanism;

Figure 2 is an end view of a conventional spinning frame and showing one embodiment of my loading mechanism Figure 3 is an enlarged plan view of the parts shown in Figure 2; 1

Figures 4 and 5 are fragmentary views in longitudinal section through top rolls particularly adapted for use with my loading mechanism; and

Figure 6 is a fragmentary perspective view showing another embodiment of my loading mechanism.

My invention is illustrated in connection with parts of a spinning frame wherein a roller beam Ill supports a plurality of roll stands, one of which is designated at H. I Each roll stand provides bearings for rotatably supporting a plurality of bottom rolls l2, l3 and M which are suitably rotatably driven by mechanism not shown. In accordance with usual practice, front, middle and rear top drawing rolls IS, IS and Il have their reducing outer ends loosely received in nonbottoming relation within guide slots 18 in cap bars 20 pivoted at their rearward ends to a cross rod 22 supported by the roll stands I I, and these guide slots l8.locate the top rolls respectively in peripherally supported rolling engagement with the corresponding bottom rolls therebeneath. Strips of yarn, thread or other suitable strips of intermingled fibers, as S, are fed between the rotating top and bottom rolls to produce a desired attenuating operation, and the pressures exerted upon these strips S by the successive sets of rolls are controlled by my loading mechan sm.

One form of my front top roll [5 is illustrated servs to hold the top roll partsin unit-handling assembled relation and has a necked outer end 32 which loosely fits in the slot IE to vertically guide this top roll l5. These necked ends 32 are non-rotatably engaged by my loading device in a manner to be described.

One form of my middle and rear top rolls l6 and I1 is illustrated in.Fig. 4, wherein a rotatable shaft 34 has spaced roll members 35 covered with suitable cots 35 that rotatably engage both the strips S and the correspondingly positioned roll portions R on the bottom rolls l3 and I4. These roll members 35 are demountably secured to the ends of the shaft 34, as by dog point set screws 31 threaded in the necked outer ends 38 of the roll members, and the necked ends 38 are loosely and vertically guided by the slots 18. A counterbore in the inner end of each roll member 35 frictionally receives andsupports the outer race ring of a ball bearing 40 which has a freely rotatable inner race ringsurrounding the shaft 34 in spaced relation. These inner race rings, which axially extend beyond the outer race rings and towards each other, co-operatively support a sleeve 4| that is non-rotatably engaged by my loading mechanism as will appear.

My pressure loading mechanism includes a generally T-shaped saddle 42 provided with a cross bar 43 from which a shank 44 extends rearwardly and substantially at right angles. The cross bar 43, which is substantially horizontally disposed forwardly of and above the front top roll l5, has its ends bent rearwardly and downwardly to provide roller engaging arms 45, the

ends of these arms being shaped to provide stepped portions 46 that rest upon and fit over the necked ends 32 of the top roll l5 as best il lustrated in Fig. 1. Each stepped portion 46 includes a downwardly extending tongue 41 which overlies the outer end 01' the collar 23. This tongue 41 loosely fits within the groove I8 and is offset from the arm 45 by a horizontally disposed foot 48 arcuately curved to substantially matingly seat upon the necked outer end 32 of the collar 29 so that downward pressure applied on the saddle 42 will be transmitted to the outer ends of the front top roll I to urge this top roll with desired pressure into supported rolling contact with the corresponding bottom roll l2. With this construction, the ball bearings 25 provide substantially frictionless rotation of the top roll point intermediate of its ends so that the shank 44 will be free to longitudinally tilt and permit an sleeve-24-about the shaft 25 whichdoes not r0-" tate, and the end collars 28 will non-rotatably engage the stepped portions 45 and will be rotatably received in the guide slots I8.

Fig. 6 shows an alternative construction for the stepped portions 45 on the ends of the crossbar 43. In this form of my invention, downwardly and rearwardly extending arms I45 corresponding to the arms 45 each terminate in .a foot I45 provided with an arcuateface I48 that substantially matingly seats in a peripheral groove I49 cut in the necked end of thecollar 28. I preferably interrupt the face I48 with a groove I50 so that the foot I45 will not rock on the collar 28 in the event of an improper seated relation of the face I48 in the groove I48.

The rearward end of the shank 44 tiltably and slidably seats in a longitudinally disposed groove 58 formed in the upper portion of a rear saddle 52 provided at its rearward end with a yoke 53 seated upon the sleeve 4| between the roll members 35 of the rear top roll I1, and the forward end of this saddle 52 has a foot 54 that rests upon the corresponding sleeve 4| of the middle top roll I5. To laterally position the saddle 52, I may provide a depending portion within the yoke 53 which seats in a peripheral groove 55 out in the sleeve 4| of the rear top roll I1. If desired, this groove 55 may be eliminated and the yoke 53 may be freely slidable axially of the sleeve 4| in which event both saddles 42 and 52 will be laterally positioned by the stepped portions 46. The ball bearings 48 in the middle and rear top rolls I5 and I! facilitate free rotation of the roll members 35 about the sleeves 4I which non-rotatably engage the saddle member 52.

' Downward pressure is appliedthrough my loading mechanism and distributed to all of the top rolls through the

co-operating saddle members

42 and 52 by a stirrup 55 which is U-shaped in cross section and which has a bifurcated hook-shaped upper end 51 in straddling relation to the saddle members and is loosely pivoted by a pin 58 to the shank 44. This pin location is preferably so located from the shank 44 that greater pressure will be delivered to the front top roll I5 than to the middle and rear top rolls I5 and II. An amplifying lever 53 has a hooked forward end fulcrumed in a vertically adjustable eye 58 secured to the roller beam III. This lever 59 passes through and rests upon the bottom of a slot 5| in the stirrup 55, and a weight or other suitable means acts through a link 52 to pull downwardly on the rearward end of the lever 53 to exert the required downward pressure on the stirrup 55.

Occasionally the strips of thread S or the like which are passed between the sets of top and bottom rolls have uneven portions, and my loading device facilitates individual tilting and individual vertical movements of the top rolls with respect to each other while maintaining the desired downward pressures on each of the top rolls. To accomplish this, the longitudinal slot 58 is up and down since the saddle 52 up and down movement of the front top roll I5 relative to the other top rolls without changing its fulcrum point. The middle and rear top rolls l5 and Il may individually tilt and individually move tiltably rests on the sleeve members 4|.

Iclaim:

1. A pressure applying mechanism for a plurality of spaced top rolls comprising a pair of connected load applying members respectively resting on the opposite ends of one of said top rolls, another load applying member bearing on at least one of said other top rolls, and weight applying means distributing downward pressures to all of said load applying members.

2. A pressure applying mechanism for a plu-. rality of spaced top rolls comprising a pair of interconnected load applying members respec-' tively resting on the opposite ends of one of said top rolls, another load applying member bearing on the intermediate portions of at least one of said other top rolls, and weight applying means simultaneously distributing downward loading pressure to all of said load applying members.

3. A pressure applying mechanism for a plurality of spaced top rolls comprising .a pair of saddles, one of said saddles having end portions respectively seated in mating relation on the opposite ends of one of said top rolls, said other saddle bearing on an intermediate portion of at least one of said other top rolls, and means distributing downward pressure in both of said saddles.

4. A pressure applying mechanism for a plurality of top rolls comprising a pair of saddles, one of said saddles resting on an intermediate portion of one of said top rolls, said other saddle resting on the opposite end portions of another of said top rolls and upon said first mentioned saddle, and means applying a downward pressure to said other saddle.

5. In a pressure applying mechanism for a plurality of spaced top rolls having reduced rounded ends, a front saddle longitudinally straddling one of said top rolls, laterally extending arms on the saddle and seated on of said top roll, a rear saddle bearing upon the intermediate portion of at least one of said other top rolls, and means for simultaneously applying downward pressure to each of said saddles.

6. A pressure applying mechanism for a plurality of spaced top rolls comprising a saddle, spaced roll engaging portions on said saddle and supported on the opposite ends of one of said top rolls, a second saddle provided with a roll engaging member supported on a central portion of one of said other top rolls, a shank on said first mentioned saddle and bearing on said second saddle, and downward pressure applying means engaging said shank.

7. A pressure loading mechanism for a plurality of rolls comprising a saddle, a cross arm on said saddle and having end portions resting on the reduced rounded ends the opposite end portions of one of said rolls, a second saddle, end portions of said second saddle respectivelywesting on intermediate portions of two of said other rolls, a shank extending rearwardly from said cross arm and resting on the second saddle, and downwardly applying pressure means engaging said shank.

8. A pressure applying mechanism for a plurality of top rolls comprising a pair of saddle members, one of said saddle members having end portions respectively supported on central portions of two of said top rolls, a cross arm on said other saddle member, laterally projecting arms on the cross arm and having end seating portions fitting over the opposite end portions of one of said other top rolls, a shank extending outwardly from an intermediate portion of said cross arm, said first mentioned saddle having a groove which tiltably receives and supports the free end of said shank, and weight applying means connected'to said shank.

9. A pressure loading mechanism for a plurality of top rolls comprising a pair of saddle members, one of said saddle members having a foot resting on the central portion of one of the top rolls, a cross arm on said other saddle member and having end portions matingly seated on the opposite end portions of one of said other top rolls, a shank extending outwardly from the cross arm, said first mentioned saddle having a depressed portion which supports a portion of said shank for tiltable movement transversely and longitudinally of the shank, and weight applying means connected to said shank.

10. A pressure loading mechanism for a plurality of spaced top rolls comprising a pair of saddle members, end portions on one of said saddle members respectively resting on intermediate portions of two of said top rolls, said other saddle member being substantially T-shaped with a rearwardly extending shank tiltably resting on said first mentioned saddle member, end portions on the T-shaped saddle member respectively seated on the opposite ends of another of said top rolls, and weighting means urging said shank downwardly.

11. A pressure loading mechanism for a plurality of spaced top rolls comprising a saddle having a cross arm, load applying members on the cross arm and matingly seated on the opposite ends of one of said top rolls, a second saddle having a foot tiltably resting on an intermediate portion of another of said top rolls, a shank extending outwardly from said cross arm and tiltably resting at one end on said second saddle, a stirrup pivotably connected to said shank, and weighting means connected to said stirrup.

12. In a mechanism of the character described, the combination with a plurality of pairs of top and bottom rolls, the individuals of each pair being mounted one above the other and means supporting said pairs of rolls to operate successively on a strip of intermingled fibers fed between them, of a T-shaped saddle including a cross arm, end portions on the cross arm shaped to overlie and matingly seat on the opposite end portions of the front top roll, a second saddle bearing on two of said other top rolls, and means for simultaneously applying downward pressure to both of said saddles.

13. In a pressure loading mechanism for a plurality of spaced top rolls having reduced cylindrical ends, a saddle, a cross arm on said saddle, arcuate end faces on said cross arm matingly seated on the opposite reduced ends of one of said top rolls, a second saddle resting on the intermediate portions of two of said other top rolls, and means applying downward pressure to both of said saddles.

14. In a pressure applying mechanism for a plurality of spaced top rolls having reduced cylindrical ends, a saddle, stepped end portions on the saddle respectively fitting over and supported on the opposite reduced ends of one of said top rolls, a second saddle resting on at least one of said other top rolls, and means simultaneously applying downward pressure to both of said saddles.

15. In a pressure loading mechanism for a plurality of spaced top rolls having reduced cylindrical ends, a saddlehaving a cross arm, stepped end portions on the cross arm and respectively overlying the reduced cylindrical ends on one of said rolls, each of said stepped end portions including a curved portion seated on one of said cylindrical ends and a downwardly extending tongue overlying said cylindrical end, a second saddle member resting on at least one of said other top rolls, and means applying downward pressure to both of said saddle members.

16. A pressure loading device for simultaneously applying downward pressure to the front, middle and rear top rolls in a spinning frame comprising a T-shaped front saddle, end arms on said saddle resting on the opposite ends of the front top roll, a rear saddle supported by the central portions of the middle and rear top rolls, a rearwardly extending shank on said front saddle and having a rearward end supported on said rear saddle, and pressure applying means including a strirrup extending upwardly between said middle and rear top rolls, said stirrup having a hook-shaped upper end pivotably connected to said shank between the front and middle top rolls.

17. In a drawing mechanism of the character described, the combination with a plurality of pairs of top and bottom drawing rolls, the individuals of each pair being mounted one above the other for successive drawing operations on a thread, of a T-shaped saddle including a cross arm having laterally projecting end portions seated on the opposite end portions of the front top roll, a rear saddle bearing on two other of said top rolls, a shank on said T-shaped saddle secured at its forward end to said cross arm and having a rearward end resting on said rear saddle, a stirrup having a bifurcated hook-shaped upper end straddling said shank and said rear saddle, a pivotal connection between the upper end of said stirrup and said shank, and weight applying means secured to the lower end of said stirrup.

18. A top roll loading device for distributing downward pressure to front, middle and rear spaced top rolls as used in a spinning machine, the front roll having non-rotatable reduced ends and the other rolls having non-rotatable intermediate necked portions, said loading device comprising a substantially T-shaped saddle provided with a cross arm, a shank extending laterally from said cross arm above the intermediate portions of said top rolls, end portions of said cross arm matingly seated on the opposite reduced ends of the front top roll, a second saddle supported at its ends on the intermediate necked portions of the middle and rear top rolls, said second saddle tiltably supporting the rearward end of said shank, and a weighting mechanism including a stirrup pivoted at its upper end to said shank.

19. In a drawing mechanism of the character described, the combination with a plurality of pairs of drawing rolls, the individuals or each pair being mounted one above the: other and means supporting said rolls to operate successively on a sliver fed between them, of a T-shaped saddle including a bar having end portions resting on opposite end portions oi! the front top roll, a second saddle member bearing on one or more of said rear top rolls, the shank of said T-shaped saddle bearing on said second saddle member, and means connected with said shank to apply weight to said saddle and therethrough to said top roll and to said second saddle member.

20. In a drawing mechanism of the character described, the combination with a plurality of pairs of drawing rolls,. the individuals of each pair being mounted one above the other and means supporting said rolls to operate successively on a sliver fed between them, of a T-shaped saddle including a bar having end portions resting on opposite end portions of the front top roll, a second saddle member bearing on one or more of said rear top rolls, the shank of said T-shaped saddle bearing on said second saddle member, and means connected with said shank to apply weight to said saddle and therethrough to said top roll and to said second saddle member, said last-named means including a stirrup pivoted to said shank and bifurcated at its upper end portion for the reception between the arms thereof 01' said shank and said second saddle member.

LELAND D. COBB.