US2408587A

US2408587A - Textile machinery

Info

Publication number: US2408587A
Application number: US572320A
Authority: US
Inventors: John W Tucker
Original assignee: Individual
Current assignee: Individual
Priority date: 1945-01-11
Filing date: 1945-01-11
Publication date: 1946-10-01
Anticipated expiration: 1963-10-01

Description

Oct. 1, 1946.

J. w. TUCKER TEXTIL-E MACHINERY Filed'Ja n. 11, 1945 5 Sheets-Sheet 1 I I YE-A Oct. 1, 1946. .1. w. TUCKER 2,408,587

TEXTILE MACHINERY Filed Jan. 11,- 1945 I 3 Sheets-Sheet 2 INVENTOR J. w. TUCKER 2,408,587

TEXTILE MACHINERY Oct. 1, 1946.

Filed Jan. 11, 1945 3 Sheet s-Sheet 3 'INVENTOR tion.

Patented Oct. 1, 1946 asts? TEXTILE MACHINERY John W. Tucker, Manchester, Ga. Application January 11, 1945, Serial No. 1572.320

' 12 Claims.

I r This invention relates to' textile manufacturing and more particularly to a means for dofiing spinning frames. In the manufacturing of textiles for the past few decadesit has been common practice to doif spinning frames by hand. That is, spinning frames. are rununtil the bobbin on each spindle of the spinning frame has the desired amount of yarn on it, then the frame is completely stopped and eachrbobbin of yarnis removed by hand one at. a time andjan empty bobbinis placed by hand on the spindle to be filled with yarn. After all the full bobbins have been removed and empty bobbins have been placed on the spindles the spinning frame is again started and run until the empty bobbins have been filled with yarn and the process of dofi'ing l the frame is repeated. This process goes on continuously in many textile mills and is a very costly and laborious process. It usually takes between ten and twenty minutes to doff a frame and while the process -of dofiing is being carried out, no production is being made as it is necessary to stop the frame beforeit can be doffed. Spinning frames are built in such a manner that the spindles which rotate the bobbins are so close: to the floor that the workmen who doif the frames find it necessary to work all day in a stooped position. After years or even months of working in this stooped position many of the workmen ruin their physique by becoming humpbacked or stoopshouldered.

It is an objectofthis invention to perform the process of dofiing in a more rapid manner by the use of machinery'than is possible to do so by hand.

Another object of thisinvention is to keep "the*-- spinning frame in production more hours per day and therefore increase the mill output of yarn or decrease the number of spinning frames necessary for the desired production.

' bobbin before the.

2 i 1 Figure 2 is an end view of the shafts taken from Figure 1 which simulatethe motions made when the dofiing procedure isperformed by hand. Figure 3 is a top view of the upper bobbin holder shown on the shaft in Figure 2.

Figure 4 is a top view of. the lower bobbin holder shown on the shaft in Figure 2." 4

Figure 5 is an end view showing the cams and mechanism used to operate the doffing machine. Figure 6 is an end view of. the mechanismused to perform the positive motion of movingthe dofiing machine from one spindleto another and holding the doffi'ng machine in'the requiredexact and stationary position while the doffing process is being performed by the dofiing mechanism.

For the, benefit of clearness the frame work which supports the'element's of the inventionand the bearings arev not shown on the drawings and are notclaimed as a part of the invention.

In the process of dOflflI'lg a spinning frame it is necessary, after the bobbins have been filled with yarn, to lower the traverse rail to the lower part ofithe bobbin and allow the yarn'tobe wound s'everaljtimes around thisportion of the 7 frame is brought to astop. After the'framjs stopped, the doffer inthe process of dofiingthelmachine takesa hold on the bobbin with his right hand above'the lower: part of the bobbin. where the yarn has'been wound on the bobbin last. H As the dofier lifts 'thebobbin fromthespindle, yarn is pulled off the lower .portion of the bobbin and the upward movement of the bobbin'c'auses theryarn to be unwound from the lower portion of the bobbin onto the spindle. The :ff'ullbobbin of yarn, is completely .remoyed from the spindle andwhile it is still held in the doffefs. right hand an empty bobbin is forced onto the spindle by the left hand. .As the "bobbin is forcedonto thespindle, it causes the Another object of this invention is to reduoe the number of workmen necessary to perform the operation of dofiing and therefore reduce the manufacturing costs and increase'the company profits.

Another object of this invention is to provide a means of dofiing whereby the performance of the operator will not be hazardous or injurious to the workers physical being.

Other objects and advantages of this invention an understanding of the following description and accompanying drawings: s I Figure 1 is a side elevation view'of theinvenwill be more readily seen and understood after 1 put into operation.

-yarn that has been previously .wound around the spindle-to become wedged between the bobbin 'and the spindle: A slight jerkon the full'bobbin held in the righthand will then cause the strand of yarn to'breakan'd thus free the full bobbin of yarn from'the spinning frame. Also, by 'wedgin'g 'the yarn between the: bobbin and the spindle, the

yarn Will be firmly held atone end so that the process of spinning the yarn onto the bobbin may be continued when the spinning frame is again The, above description of the motions performed during the process of doffing a spindle'is well known among those trained in the art of textile manufacturing and is only given hereto show that the movements described above are simulated in this invention.

In Figure 1 is shown the motor 2 which contains shaft 4 on which is carried pulleys 6 and B. Pulley 6 drives shaft I2 by means of belt I6. 011 shaft I2 are securely mounted pulleys I4, I8 and 26 (see Figure 5) by means of hubs and set screws. Also mounted on shaft I2 is pulley I6 which is free to rotate around shaft I2 and is held in its proper place along the shaft by guide 22 which is firmly attached to shaft I2 by set screw 24. Bearings 26 and 28 support shaft I2 and its pulleys. Pulley 26 which is secured to shaft I2 by means of its hub 2I (see Figure 5) and set screw 23 drives chain belt 30 which in turn drives shaft 32 by means of pulley 34 which is firmly attached to shaft 32 and held in place by hub 36 and set screw 38. Shaft 32 has firmly mounted on it,

cams

40, 42 and 44 and bevel gear 46 having

hubs

48, 50, 52 and 54; and set

screws

56, 58, 69 and 62 respectively, which hold them firmly attached to shaft 32. Bearings 64 and 66 support shaft 32 and. its cams and pulley and bevel gear. Bevel gear 46 meshes with bevel gear 68 which is rigidly attached to shaft 16 and held by hub 72 and set screw I4. Shaft I is supported by thrust bearings 16 and I8 and also has firmly attached to it bevel gear 80 which is held in place by set screw 82.

Bevel gear 86 meshes with bevel gear 84 which is rigidly mounted on shaft 86 by means of set screw 83. Cylindrical cam 90 is firmly attached to shaft 86 and held in place by set screws 92 and 94. Thrust bearings 96 and 98 support shaft 86 and cam 96 and bevel gear 84. "Wheels I66, I62 and I64, I66 mounted on shafts I08 and III) respectively, support the entire machine.

Also shownin Figure 1 is the empty-bobbin box H2 having throat H4, through which the empty bobbins pass, and agitator II6 which is mounted on shaft II 3. Shaft H8 is made to rotate clockwise and then counterclockwise by means of gear I2Il'and reciprocating rack I22. Rack I22 reciprocates through guide I24 which is secured to bobbin box I I2. The angularly bent extension of rack I22 is secured to rack I26 by fusion welding or other suitable means. Rotatably connected to rack I26 is arm I28 by means of union I36. Arm I28 extends through bearing I32 which contains pin I34 which fits into groove I36 on arm I28. Member I38 is slidably mounted on platform I46 which supports bearing I32 and stop piece I42. Arm I28 also extends loosely through member I33. The bent extension of arm I28 carries bobbin holder I44 which in turn carries the leaf spring I46 which holds the bobbin after it passes through throat H4. Bumper I46 forces the bobbin into spring I46 as arm I28 moves laterally under the bumper. to hearing I32 and member I38. Bearing I32 is rigidly attached to platform I46, therefore, spring I56 causes member I38 to move horizontally until stud I52 on member I38 reaches stop 142; this movement causes the upper platform I31 on memher I 38 to slide underneath the opening of the throat II4 when bobbin holder I44 is not under Arms I68, mi and 112 are rotatably mounted Spring I59 is attached 4 on shaft I14 and are held in place on the shaft by sleeves I16 and set screws I78 (see Figure Firmly attached to'arms I68, I16 and H2 by welding or other suitable means are studs I66, I82 5 and I64 which are followers of

cams

46, 42 and 44 respectively, Arms I68, I16 and I12 contain slots I86, I88 and I 96 respectively and are connected to shafts I92, I94 and I66 (see Figure 2) by means of sleeves I98, 206 and 262 and

studs

204, 205 and 268 respectively. Shafts I92, F94 and I 96 are more clearly seen in Figure 2.

In Figure 2 are shown shafts I92, I94 and I99. Studs 204, 266 and 298 are securely fastened to sleeves I96, 260 and 262 which are secured to shafts I92, I94 and I 66 respectively, by welding or other suitable means. Shaft I92 slides smoothly Within hollow shaft I94 and both shafts are guided by fixed sleeves 2H1 and H2. Shaft I96 is guided in its movements by stationary sleeves 2I4 and H6. The lower bobbinholder 2I6 is suitably attached to shaft I94 and held in place on the shaft by sleeves 229 and 222 and through bolts 223. One end of lower bobbin holder 2I8 fits onto a bobbin of yarn 224 on the spinning frame and. the other end embraces shaft 596 which is so designed to act as a cam and cause bobbin holder 2I8 to grip or releas the bobbins, whichever may be desirable at the proper time in the operation of dolfing the spinning frame. The upper portion, I92-'A, of shaft I92 at point I93 becomes separate and is so designed that the upper part, I92-A, may rotate about and on the lower part. The top part of the lower portion of shaft I 92 is reduced in diameter to fit the hollow part at point I93 of the upper portion, I92-A, of shaft I92 which permits the top portion, I92-A, of shaft I92 to rotate on the lower portion of shaft I92. The upper bobbin holder 226 (shown in Figure 3) embraces the upper portion, I62A, of shaft I92, and the enlarged portion 226 of shaft I92 acts as a cam to cause bobbin holder 226 to grip or release the bobbin of yarn 224 after the bobbin has been raised above the spindle by bobbin holder 2IB and shaft I94. Upper bobbin holder 226 is vertically stationary and does not move vertically with shaft I92. Bobbin holder 2 26 is held vertically in place by sleeves 229 which are rigidly held together by connectors 232 and held vertically in place by arms 234 which are rigidly connected to sleeve 2I2 by fusion welding or other suitable means. Sleeve 212 has firmly connected to its inner side stud 233 which fits into the groove 238 on shaft I 92. Also bobbin holder 226 has firmly connected to its inner side studs 246 which fit into groove 242 on shaft I92. As shaft I92 is moved upward (by cam action explained later) groove 233 and stud 236 will cause the upper portion, I92A, of shaft I62 to rotate approximately 90 degrees; during the same time the enlarged portion 228 will enter into its proper place in-bobbin holder 226 causing the bobbin holder to grip the bobbin of yarn, and as the upper portion, I 92A, of shaft I92 is rotated, stud 240 which is attached to the bobbin holder and fits into groove 242 will cause bobbin holder 226 to rotatewith the upper portion, I92-A, of

shaft'I92.

Bobbin holder 226 has flanges 244 which permit the holder to open and close its grip and still 70.be held in place by sleeves 229 and 236.

In Figure 3 is shown the upper bobbin holder 226 having

prongs

246 and 248. Plates 256 are welded to prong 248 and are rotatably connected to prong 246 by pin 252. Leaf springs 254 and 256 are attached to plates 259 by means of pins .In-operation, the spin 258. The springs 254 and 256 are so designed to apply enough pressure to'

prongs

246 and 248 to keep the lugs 240 within their grooves 242 In Figure 4 is shown lower bobbin holder

2I8 having prongs

260 and 262 whichare held in in place by collars I9! and set screw I93.

Bearings

91 and 58, mounted on shaft I98 support the frameworkof this embodiment of this;invention.

, Shaft 86 is shown having cylindrical cam 99 securely mounted thereon. I Cylindrical cam 99 has groove 9I formed on its surface into which stud 93 fits. Stud 93 is firmly attached to plate 95 by welding or other means and the plate 95 is held in the recessed portion of the floor. Cam 99 is so designed that as it rotates, stud 93'comes into contact with groove 9 I, this causes thewhole machine to move forward until the straight por 'tion of the groove (see Figure 1) comes into contact with stud 93. While the straight portion of the groove is in contact with stud 93 theimachine will move neither forward nor backward and re-v quires-no brake mechanism to holdthe machine in the desired position. Studs 93 have the same spacing as the spindles on the spinning frame. By means of the studs and the cylindrical cam, the dofling machine is moved fromone spindle'to the next and is stopped at each spindle just long enough for the dofiing mechanism to remove from the spindle, the full bobbin of yarn and'replac'e it by an empty bobbin. Wheels I00 and I02 are shown on tracks 15 and 11 which form recesses in the flooring'19. The motor is driven from D. C. or'A. C.'source using an overhead trolley line from which the current may be taken and using the track 11 as a ground. This means of transmitting current is old in the art and is notclaimed as a part of the invention.

ning frame will-be stopped and the doffing'machine will be on "its tracks along the length of. the frame and motor 2 may be'started by making proper contact with the electric source. At the beginning of the dofiing procedure, shafts I92, I94 'and I96 will be just

pl'aceby sleeves

220 and 222 and pins223. Leaf in line with the first spindle on. the spinning springs 264 and 266 are firmly attached to pins frame, bobbin holder 2I8 will be in a

position

268 and 210 respectively: The springs 254 and just over the top of the first bobbin and lever cam 266' are designed to apply enough pressure to I96 will be in the proper position to cause the

prongs

260 and 262 to cause the proper parts to front jaws of bobbin holder 2I8 tobe open. Cyfit" snugly against the shaft I96 and cause the lindrical cam 90 will be in such a position that prongs'to release bobbin 224 at the proper time. pin 93 will have just entered the straight portion In Figure 5 is shown shaft I56 supported by of groove 9I and will hold the doiiing machine bearings I55. Gear I54 is securelyfastened-to in a horizontally stationary position during the shaft I 56by meansof set screw I 53. Pulley I4 process of doffing the first bobbin. is securely mounted on shaft I2 and held in place Shipper handle Z'IB' may be lowered and cause by means of set screw I3. 7 shipper 2-12 to place'belt ID on pulley IB. Shaft Shipper 212 is held and supported by bearing I2, onwhich pulley I8 is rigidly mounted, will which permits Sh pper 212 to slide horizontalbe forced to rotate in counterclockwise direction. 3- O 5 of shipper 212 make contact with The motion of shaft I2 is transmitted to shaft 32 the leather belt III and cause belt II) to travel by means of chain belt 39 and gears 29 and34. either on fixed pulley I8 or loose pulley I6. Ship- As shaft 32 rotates, ca-

ins

49, 42 and 44 will act per handle 218 is attached to shipper 212 by against levers I63, I19 and I12 respectively, and means of stud 289 and slot 292; the shipper hancause shafts I92, I94 and I95 respectively, to be 6 273 is rotatably mounted 0 Stud W i 25 raised or lowered in a vertical position. Bevel is s r ly tt h d t supp0 t286 y W lding or gear 46 will transmit power to shaft lo'by means other means. of bevel gear 68 which in turn will transmit power Also Figure 5 more clearly shows the cams 49, to shaft 86 by means of bevel gears 89 and 84. 42 and 44 which operate and controlthe actions Each time shaft I2 makes a revolution it will of arms I68, I10 and I12 by means of stud folcause gear I54 to make a partial revolution in a lowers I89, I82 and I84 respectively. clockwise and then a counterclockwise motion.

By means of shipper 212 and idler pulley [6f This will cause arms I28 and I22 to move formotor 2 may be allowed to run without operating ward and backward in a horizontal direction. As the dofling mechanism. As long as belt I 0 is arm I22 moves it will cause, by means of gear traveling on idler I6, shaft I2 will not rotate. I 29 and shaft H8, the ag t liflr t P 011 At the proper time, by use of shipper 212, belt clockwise'and counterclockwise and aid the empty I0 can be made to travel on pulley I8 and thus bobbins in their passage through throat H4. As cause the doffing mechanism to operate. arm I28 .is moved forward, p a gTOOVB In Figure 6 is shown shaft I98 having wheels I36 will cause bobbin holder I44 to rotate approx- I06 and I82 securely mounted thereon and held 40 imately 90 degrees and place an empty bobbin justover the top of an empty spindle on the spinning frame.

As cam 42 lowers rod I94 and'bobbin holder- 2I8. the open jaws of bobbin'holder 2I8 pass 5 along the outside edges of the full bobbin of .yarn 224. Gain 42 lowersholder 2I8 until it is at a position about 1 /2" above the bottom portion of the yarn. When holder 2I8 reaches the above described position, earn it lowers lever I12 and shaft I96 until the enlarged cam portion of shaft I 96 fits into the rear jaws of holder 2&8 and causes the front jaws to close and grip bobbin 224. Immediately after'the holder 2H3 has a firm grip on-bobbin 224,

cams

42 and 44 act si- 65 multaneously to raise rods I94 and I96 upward. Bobbin holder 2I8 is-at'tached to rod I94 and is therefore raised upward and removes bobbin 224 from itsspindle. Rods I94 and I'96"a re raised at the same speed inorder that the enlarged cam portion of rod I96 may not allow holder2l8 to lose'its grip on bobbin 224. As bobbin 224 is raised upwards, yarn from the lower portion of the bobbin will be reeled off the bobbin and will entwine itself around the spindle.

Bobbin 224 will be raised until it has entered the open jaws of bobbin holder 2.26, and will be held in this raised position until cam 49 has raised lever IE8 and shaft I92 into such aposition that the enlarged cam portion 228 of shaft 70 I92 has entered the rear jaws of bobbin holder 226 and has caused the front jaws of bobbin holder 226 to have a firm grip on bobbin 224. At this stage, cam 44 causes shaft I96 and its enlarged cam portion to move further upward in order to .25 allow. bobbinv holder 2I8 to release its gripon bobbin 224. By this time, cam 40 has caused shaft I92 to move high enough that the curved portion of groove 2% has reached pin 236. Further raising of shaft 92 will cause, by means of groove 238 and pin 236, the upper portion, I92-A, of shaft 582 and bobbin holder 226 to rotate approximately 90 degrees and move bobbin 224out of the way so that an empty bobbin may be placed on the spindle from which bobbin 224 was removed.

When bobbin 224 has been moved out of the way, rod I28 is moved forward according to the previous description of its movement and an empty bobbin held by spring gripper I46 in bobbin holder I44 is moved from bobbin box II 2 to its position just over the emtpy spindle. When the empty bobbin is placed over the spindle, bobbin holder 2 I8 which has pust released bobbin 224 is position to grasp the empty bobbin. Cam. M lowers shaft I96 and its enlarged cam portion causes bobbin holder 2I8 to firmly grip the empty bobbin, then

cams

42 and 44 simultaneously lower shafts 88 i and I95 respectively, which causes the empty bobbin to be placed on the spindle. As the empty bobbin is placed on the spindle, the yarn, which is entwined around the spindle and connected to the bobbin or yarn that has just been removed, will became wedged between the spindle and the inside of the empty bobbin. Further lower ng of the empty bobbin will break the yarn and release the full bobbin of yarn 224 from the spinning frame. While the empty bobbin was being placed on the spindle, the full bobbin 224 was being held by bobbin holder 226, and cam 40 was causing shaft I92 to be moved in an upward direction and groove 239 and pin 236 was causing bobbin holder 226 and bobbin 224 to be rotated approximately 90 degrees. As soon as the empty bobbin is placed on the spindle and the thread broken as previously described, cam 49 will cause shaft I92 to be raised further until the enlarged cam portion of shaft I92 has passed through the rear jaws of bobbin holder 226.

This movement will allow bobbin holder 226 to release bobbin 22 4 which may be dropped into a bobbin box. By this time cam 44 will cause shaft 596 to move upward and allow bobbin holder 218 to release the empty bobbin, then cams 42 and M will simultaneously raise shafts I94 and I 96 respectively, until they are in the proper position to do-ff the next bobbin. Also, cam 46 will allow shaft E92 to be lowered and cause bobbin holder 225 to rotate back to its normal position to assist in the operation of doiling the next bobbin. By

the time that the bobbin holders 2I8 and 226 are in the above described positions, cylindrical cam 95! will have rotated until the curved portion of groove ill has reached pin 93. Further rotation of shaft 86 and cylindrical cam 90 will cause the doffing machine to be moved to the next spindle where the entire doifing procedure will be repeated.

In order to expedite the doffing of a spinning frame, one of the above described dofiing machines may be used on each side of the spinning frame which will facilitate the doifing procedure and allow the spinning frame to be quickly placed again into production.

While the embodiment illustrated on the drawings has been described with considerable particularity, it is to be expressly understood that the invention is susceptible of many embodiments without departing from the spirit of the invention, and reference is therefore to be had to the appended claims for a definition of the invention.

What is claimed is:

1. In combination with a spinning machine, having conveyor tracks alongside the frame, a dofiing device comprising, an empty bobbin container, an arm and bobbin holder for transferring empty bobbins from said empty bobbin container to a position directly over a spindle of said spinning machine, a second arm and bobbin holder to dofi the spindles of said spinning machine, a third arm and bobbin holder to remove the full bobbins of yarn from the grasp of said second bobbin holder, and a cylindrical cam for conveying said doffing device along said tracks.

2. In combination with a spinning machine, a dofiiing device comprising, an empty bobbin container, an arm and bobbin holder for transferring empty bobbins from said empty bobbin container to a position directly over a spindle of said spinning machine, a second arm and bobbin holder to doff the spindles of said spinning machine, a third arm and bobbin holder to remove the full bobbins of yarn from the grasp of said second bobbin holder, vertical shafts on which the second and third arms and bobbin holders operate, and cams to operate said second and third arms and bobbin holders on said vertical shafts.

3. In combination with a spinning machine having conveyor tracks alongside the frame, a dofiing machine comprising, an empty bobbin container, an arm and bobbin holder for transferring empty bobbins from said empty bobbin container to a position directly over a spindle of said spinning machine, a second arm and bobbin holder to doff the spindles of said spinning machine, a third arm and bobbin holder to remove the full bobbins of yarn from the grasp of said second bobbin holder, vertical shafts on which the second and third arms and bobbin holders operate, cams to operate said second and third arms and bobbin holders on said vertical shafts and a cylindrical cam for conveying said dofiing machine along said tracks.

4. In combination with a spinning machine having conveyor tracks alongside the frame, a dofiing machine comprising, an empty bobbin container, an agitator for assisting the passage of empty bobbins through the said container, an arm and bobbin holder for transferring empty bobbins from said empty bobbin container to a position directly over a spindle of said spinning machine, a second arm and bobbin holder to dofi the spindles of said spinning machine, and a cylindrical cam for conveying said dofiing machine along said tracks.

5. In combination with a spinning machine, a doffing machine comprising, an empty bobbin container, an agitator for assisting the passage of empty bobbins through the said container, an arm and bobbin holder for transferring empty bobbins from said empty bobbin container to a position directly over a spindle of said spinning machine, a second arm and bobbin holder to doff the spindles of said spinning machine and a third arm and bobbin holder to remove the full bobbins of yarn from the grasp of said second bobbin holder. I

6. In combination with a spinning machine having conveyor tracks alongside the frame, a doffing machine comprising, an empty bobbin container, an agitator for assisting the passage of empty bobbins through the said container, an arm and bobbin holder for transferring empty bobbins from said empty bobbin container to a position directly over a spindle of said spinning machine, a second arm and bobbin holder to doif 9 the spindles of said spinning machine, a third arm and bobbin holder to remove the full bobbins of yarn from the grasp of said second bobbin position directly over a spindle of said spinning,-

machine, a second arm and bobbin holder to doff the spindles of said spinning machine, a third arm and bobbin holder to remove the full bobbins of yarn from the grasp of said second bobbin holder, vertical shafts on which the second and third arms and bobbin holders operate, and cams to operate said second and third arms and bobbin holders on said vertical shafts.

8. In combination with a spinning machine having conveyor tracks alongside the frame, a doffing machine comprising, an empty bobbin container, an agitator for assisting the passage of empty bobbins through the said container, an arm and bobbin holder for transferring empty bobbins from said empty bobbin container to a position directly over a spindle of said spinning machine, a second arm and bobbin holder to doif the spindles of said spinning machine, a third arm and bobbin holder to remove the full bobbins of yarn from the grasp of said second bobbin holder, vertical shafts on which the second and third arms and bobbin holders operate, cams to operate said second and third arms and bobbin holders on said vertical shafts and a cylindrical cam for conveying said dofling machine along said tracks.

9. In combination with a dofling machine,

10 means for conveying said machine alongside a spinning frame comprising, a double track, a longitudinal member between said double track, equally spaced lugs mounted on said longitudinal member and a cylindrical cam acting against said lugs to convey said doffing machine with intermittent motion along said double track.

10. In combination with a dofiing machine, means for conveying said machine alongside a spinning frame comprising, a double track, a longitudinal member, equally spaced lugs mounted on said longitudinal member, and a cylindrical cam acting against said lugs to convey said doffing machine. with intermittent motion along said double track.

11. In combination with a doffing machine, means for conveying said machine comprising a double track, a longitudinal member, equally spaced lugs mounted on said longitudinal member and a cylindrical cam acting against said lugs to convey said dofiing machine along said double track.

12. In combination with a spinning frame, a dofiing machine comprising, an empty bobbin container, an agitator for assisting the passage of empty bobbins through the said container, an arm and bobbin holder, mechanically operated to transfer the empty bobbins from the bottom of the empty bobbin container to a position directly over a spindle of said spinning frame, a second arm and bobbin holder, cams to operate and cause second arm and bobbin holder to remove the full bobbins of yarn from the spindles of said spinning frame and replace with empty bobbins, and a cylindrical cam to convey the dofiing machine with intermittent motion alongside the spinning frame.

JOHN W. T CKER.