US3190195A - Convolute tube making machine - Google Patents

Description

June 22, 1955 J. SNYDERMAN ETAL 3,190,195

CONVOLUTE TUBE MAKING MACHINE 4 Sheets-Sheet 1 Filed May 27, 1963 v.2 9Q u INVENTORS JOSEPH SNVDERMAN B MA I? 7711/ $CHA/A8L @T @Ww ATTORNEY June 22, 1965 J, SNYDERMAN ETAL 3,190,195

CONVOLUTE TUBE MAKING MACHINE Filed May 27, 1 965 4 Sheets-Sheet 2' INVENTORS JOSEPH SNYDER/VAN MART/IV SCH/VA BL 111M122, 5- J. SNYDERMAN ETAL 3,190,195

QQNVQLUTE TUBE MAKING MACHINE Filed May 27, 1963 4 Sheets-Sheet 3 June 1965 J. SNYDERM'AN ETAL CONVOLUTE TUBE MAKING MACHINE Filed May 27, 1963 4 Sheets-Sheet 4 INVENTORS JOSEPH SNVDERMAN MART/IV SCHNABL ATTORNEY United States Patent 3,190,195 CONVOLUTE TUBE MAKING MACHINE Joseph Snyderman, Philadelphia, and Martin Schnabl, Elkins Park, Pa., assignors to John Eppler Machine Works, Inc., Philadelphia, Pa., a corporation of Pennsylvania l Filed May 27, 1963, Ser. No. 283,268 14 Claims. (Cl. 9381) This invention relates to a convolute tube making machine.

Tube making machines have been made over a long period of years which included provisions for feeding from a roll and glue coating an elongated strip of paper, advancing the strip along a mandrel onto which it is to be wound, cutting the strip to the desired length in accordance with the length of the paper tube to be made, further advancing the strip along the mandrel to a location for winding, winding the strip onto the mandrel to form a convolute paper tube, stripping the wound paper tube from the mandrel after completion of the winding by moving a tube stripper along the mandrel, returning the tube stripper to its initial position, all in timed sequence, and repeating the foregoing operations for the continuous production of paper tubes of predetermined length. In prior machines of successful nature, where a length of paper tube of the order of 80 inches or less was to be wound and because of the length of mandrel there employed and the cantilever mounting of the mandrel, an end support was provided for the free end of the mandrel, this end support being retracted in timed relation to permit the operation of the stripper and removal of the paper tube.

The demands of the trade for longer tubes has necessitated employing a longer mandrel. With longer mandrels to accommodate tubes of lengths of two hundred inches or more, it was previously supposed that intermediate support of the mandrel and tube during winding, and of the mandrel and tube during stripping, and preferably at a plurality of spaced locations along the mandrel, was necessary. Such intermediate supports necessitated the use of considerable operating mechanism.

In prior machines, also, provisions had been made to smooth the paper from above during its winding onto the mandrel, and also to providepaper smoothing or slicker elements below the mandrel. In earlier and smaller machines the slicker elements were simultaneously retracted, while in later and larger machines the upper slicker elements were all retracted at the commencement of the tube stripping while the lower slicker elements were successively retracted in groups.

It is the principal object of the present invention to provide a convolute tube winding machine of greatly simplified construction which can employ a long winding mandrel, so that a long paper tube can be made at each operation.

It is a further object of the present invention to provide, in a convolute tube winding machine having a mandrel, in addition to a supporting element for the mandrel at the end of the working portion of the mandrel a supporting element therebeyond which is effective upon retraction of the first supporting element.

It is a further object of the present invention to provide, in a convolute tube winding machine having a man- 3,l%,l Patented June 22, 196 5- drel with a supporting element for the end of the mandrel, an auxiliary supporting element beyond the end of the mandrel which can additionally serve the purpose of facilitating the stripping of the tube after winding.

It is a further object of the present invention to provide a convolute tube winding machine for tubes of a length of the order of two hundred inches or more of simpler construction than has heretofore'been available, and in which improved structure isprovided for facilitating the stripping of the wound paper tube.

It is a further object of the present invention to provide, in a convolute tube winding machine having a mandrel and slicker elements for smoothing the paper on the mandrel during the winding, an auxiliary support for the mandrel located beyond the end of the mandrel and beyond the slicker elements.

It is a further object of the present invention to pro, vide a convolute tube winding machine having a winding mandrel with a retractable support at its free endand an auxiliary support therebeyond, the auxiliary support having positive provisions for aiding in the retraction or stripping of the wound paper tube.

Other objects and advantageous features of the invention will be apparent from the description and claims.

The nature and characteristic features of the invention will be more readily understood from the following description taken in connection with the accompanying drawings forming part thereof, in which:

FIGURE 1A is a top plan view of the entrance end of a convolute tube making machine in accordance with the invention;

. 'FIG. 1B is a'continuation of FIG. 1A to the tube delivery or discharge end of the machine;

FIG. 2-is a fragmentary front elevational view, enlarged, of part of the machine shown in FIGS. 1A and 1B, and illustrating the freeend support for the mandrel, part of the upper and lower paper smoothing or slicker elements, and the auxiliary support;

FIG. 3 isavertical sectional view taken approximately on the line -33 of FIG. 2, illustrating details of the upper and lower paper smoothing elements and the control of the positioning thereof;

FIG. 4 is a vertical sectional view taken approximately on the line 44 of FIG. 2, illustrating the mandrel free end support and the control of the positioning thereof;

FIG. 5 is a vertical sectional view taken approximately on the line 55 of FIG. 2 and illustrating details of the auxiliary support;

FIG. 6 is a fragmentary perspective view of the tube stripper arm and the shaft on which it is mounted;

FIG. 7 is an enlarged fragmentary perspective View showing details of one of the lower paper smoothing elements; a

FIG. 8 is a horizontal sectional view taken approximately on the line 88 of FIG. 7;

FIG. 9 is an enlarged fragmentary longitudinal sectional view of the. end of the mandrel, showing the attachment of the tube receiving shaft; and

FIG. 10.is an elevational view of the cam for controlling the positioning of the upper and lower slicker elements and the mandrel free end support.

It should, of course, be understood that the description and drawings herein are illustrative merely, and that I new. paper strip feed, which is followed finished tube therefrom.

parts throughout the several a transverse frame portion and a longitudinal frame a portion 16 (see FIGS. 1A and-2). The frame portion;

15 has a top horizontal transverse frame plate 17." The frame portion 16 has a top horizontal longitudinal frame plate. 18, at the same level as the frame plate 17 and side sections 19 with transverse frame rails 20 therebetween at a plurailty of spaced locations; The frame portion 15 can carrytherealong paper pinch- 7 ing devices (not shown). controlled by a cam 21, and a paper cut oifknife' (not shown) controlled by-a knife The frame portionlS has a glue pan 23 with' provisions for glue application to the paper including glue transfer rollers 24, and glue applying and transfer rolls 25, as has heretofore been common practice. The rollers 24-and rolls '25 are intermittently driven as the paper is advanced through a transmission unit 26 which is in turn driven by a chain drive 27 from a transverse drive shaft 34.

Transverse frame bars 28 and 29 have wires 30 extend-- ing. therebetween for supporting the paper strip advanced from the paper supply roll (not shown) in preparation for winding into convolute tubular form. A- motor 31 is The mandrel 54 hasa longitudinal slot 64 thereon for the reception of theleading longitudinal edge of the sheet to be wound thereon as the same is fed along the wires 30. t The mechanism for feeding the paper along the w1res 30, for applying glue thereto, for severing the paper-at the trailing transverse edge, for advancing the paper along and to the mandrel 54, and for rotating the mandrel 54, is

well known in the art.

The frame plate 18 contiguous tothe end of the;man-.

drel 54' (seeFIGS. 2 and 4) has abracket 65 mounted thereon in which a stub shaft 66 is pivotally mounted-L The stub shaft 66 has a supporting arm67 secured thereto with a mandrelsocket 68 for supporting engagement with.

the mandrel 54. The stub shaft 66 also has an actuating arm 69"carriedthereby' to which a cam rod 70 is pivotally connectedby a pivot pin 71 The cam rod 70 extends through the frame plate 18 and has a bifurcated cam fol-.

lower 72 straddlingthe'cam shaft: 37*with a cam follower pin 73 engaged with amandrel free end supporting cant .20

74cm the cam shaft'37. 'The cam 74 hasa shapeas shown in FIG. 10.

The frame plate 18, at 'aplurality spaced locations" between the ends of the mandrel 54, has slicker or smooth-.

provided connected through a suitable chain drive 32 to' I the shaft 34. The shaft 34 aclutch drive shaft 42. V r I V The clutch drive shaft 42 is connected through gearing 40. to drive the cam shaft37 and the camshaft 37 is'in turn connected through gearing 5 0 to a shaft '49and then I through a deceleration drive mechanism 48 to a shaft 45.

The, shaft 42 isalso connected through a'clutch'drive through gearing 33 drives and speed controller and reducer to a tube winding 1 mandrel 54 for intermittently driving/the same. As an illustration of a specific motion during each cycle the mandrel can be rotated for 168 forpaper winding; fol

lowed by a 12 shift, with the driveJthen disconnected for a 168. period of rest utilizedfor tube'stripping and engage the drive.

by'a 12 shift to s end toend with the tube being rolledonto the mandrel 54.

The cam shaft 37 is supported in spaced bearings 38 .carried by the transverse frame rails 20'. r V Theframe portion 16 has, mounted thereon upper and lower carriage 'rails 39 for carrying the stripper carriage 41 which forms part of' the tube stripper. The, carriage 41 is operated with a controlled motion, with reciprocation in timed relation in a horizontal path, andwith the drive slowing down the carriage movement at'each' end of its movement in a well known manner. For this 'purpose the shaft drives a sprocket 44' with which a rec'- tangular loop of chain 43 is in engagement on the upper run thereof. The chain 43 has a shuttle mechanism (not shown) connected to a selected. location on the chain 43 for moving the carriage 41 horizontally with a decreased acceleration and a dwell at each end of the horizontal movementiwhile the vertical paths of the'chain 43 are followed.

The stripper carriage 41 has a stripper. arm shaft mounted thereon with a stripper arrn' 56 '(see FIG. 6) for sliding movement along the mandrel 54 to strip the The stripper carriage 41 on the stripper arm shaft 55 also has a plurality of paper feed pins 57; for feeding the paper transversely of the wires 30 to the mandrel 54 past the paper guide rails 58,'aided by feed. pins 59. carried on a shaft which is raised by an arm 61. The arm 61 is" positioned by spaced cams (not shown) on the carriage 41.

ing element brackets 9 5rmounted thereon in spaced pairs.

One of these brackets and its associated structure is shownin FIG 3. ,7 'Each of the pairs of brackets shaft 96 pivotally mounted therein;witl1 spaced limit bracket plates 97 adjustably held with respect thereto by clamp bolts 98. The bracket plates. 97 have limit fingers 99 thereon.

with the'limit fingers 99 by springs 101 in sockets 102 and "which have adjustable screws 103 mounted in projections.

104 on theplates' 97 bearing thereagainst. 'A limited movement, of the presserarms ltm is thus provided-.1 The;

presser'arrns 100. have rockers 105. .pivotally' mounted thereon on rocker shafts 106.. Restoring coil springs 107 each have one end engagedin a rocker and the; other in an adjusting collar 108'on the rocker shafts 106. The

collars 108 are held in adjusted position by set screws 109,1

The rockers 105 have alsp'aced pair of continuous presser rods 110 secured thereto for engagement from Each shaft 96 also has an actuating arm 111 secured thereto to the'end of which a cam rod 112' is connected." 7'

The cam rod 112 has a threaded insert 113 for adjustment of the length thereof. e

lower' pin 116 engaged with a lower slicker control cam 117 which has a shape as shown'inFIG. l0. l a

, shaft 120 pivotally mounted thereon with spaced limit The lower end of the cam rod 112 has a bifurcated cam follower straddling the cam shaft 37'witl1 a cam fol- Each of the'pairs of brackets 95 has an upper slicke bracket plates 1'21 adjustably held withlrespectthereto by clamp bolts 122. The bracket plates 121" are similar to the bracket plates 97 and have limit fingers 1231 thereon.

Each shaft also has presser' arms 124 movably mounted thereon and urgedtowards engagement with the limit fingers 123 by springs (not shown) but like the springs 161, with adjustablescrews 126, mounted-in pro jection-s 127 on the plates 121,.bearing thereagainst. A

limited movement of the presser arms 124 is thus provided. The presser arms 124 have rockers 128- pivotally mounted. thereon on rocker shafts 129. Restoring coil springs 130 each have one end engaged in the rockers128 I and the other in an adjusting collar 131 on the rocker. shafts129. The collars 131 are held in adjusted position by set screws 132. I Q 7 The rockers 128 have a] spaced pair of continuous presser rods. 133 secured thereto for engagement from 1 end to endwith the tube being rolled onto the mandrel 54.

Each shaft 120 also has an. actuating arm 134 secured thereto to the end of which a cam rod 135 is connected.

95 has-a lower slicker Each shaft 96 also has presser, arms 100 I movably mounted thereon and urged towards engagement:

The cam rod 135 has a threaded insert 136 for adjustment of the length thereof.

The lower end of the cam rod 135 has a bifurcated cam follower 137 straddling the cam shaft 37 with a cam follower pin 138 engaged with an upper slicker control cam 139, which has a shape as shown in FIG. 10.

In order .to permit of quick, release of the top presser bars 133 a lock mechanism can be providedwhich includes lock levers 140 pivotally mounted on pivot pins 141 carried on brackets 142. The lock levers 140 have locking tongues 143 urged into engagement with complemental sockets 144 in collars 145 by springs 146. The collars 145 are secured to the shafts 120.

The cam shaft 37 has mounted thereon the cams 74, 117 and 139 for controlling the positioning of the mandrel free end of support 68, the lower presser rods 110 and the upper presser rods 133. These cams are preferably all as shown in detail in FIG. 10, seen from the end of the mandrel .54 and with a counter-clockwise direction of rotation. The earns 74, 117 and v139 are similar in shape and are oriented on the cam shaft 37 to provide the desired interrelation between the upper and lower slicker bar retraction and the retraction of the support 68 to permit the stripping.

The cam 74 has a short portion 151 of a hold up dwell 152 followed by a fall 153 through about 31. A down dwell 154 of about 122 is then followed by a rise 155 through about 31. This is followed by the hold up dwell 152 through about 176, including the portion 151.

The cam 117, which controls the lower presser rods 110 has, a rise 155 through about 31, a retract or open dwell 154 through about 122, a fall 153 through about 31 and a lower or closed dwell 152 through about 176.

The cam 139 which controls the upper presser rods 133, is timed the same as the cam 117, has a rise 155 through about 31, followed by an open or retract dwell 154 of about 122", a fall 153 of about 31 and an apply or close dwell 152 of about 176.

The mandrel 54, atthe free end thereof (see FIG. 9),

has an end collar 230 secured therein in abutting relation to an interior shoulder 231. The collar 23% has a reduced outer end portion 232 and 'can have sleeves 233 thereon, of nylon or the like for reducing wear upon the engagement therewith of the mandrel socket 68. A tube receivingflshaft 235 is provided having, at one end, a shoulder 236 abutting against the collar 238, an end extension 237 received within the collar 230, and a threaded end 233 for the reception of a washer 240Iand nut 241. The

- nut 241 is accessible through the opening 242,.a plough edge 243 of which serves to guide the leading edge of the paper into smooth relation inside the wound tube as the same is stripped from the mandrel 54. r

The tube receiving shaft 235, at the other end, has a tube receiver sleeve 245 withtapered ends 246. and 247 and a central portion 248 preferably the same or slightly smaller diameter than the outside diameter of the mandrel 54.

The longitudinal frame portion 16, contiguous to the bracket 65 has a support bracket 25%) secured thereto.

The bracket 250 has a vertical face251 to which the vertical face 252 of a motor support bracket 253 is secured by bolts 254 in elongated slots 255. A horizontal rod 256 has a threaded opening 257 in which a threaded adustmg rod 258 is in engagement. The rod 258 has spaced heads 259 on opposite sides of a horizontal frame plate -(not shown) interposed between the motor 261 and a horizontal driven shaft 263. The shaft 263 is supported 6 in bearings'265 in a bearing housing 266 carried by the motor support bracket 253.

The shaft 263 has a tube and shaft support pulley 270 thereon, preferably with a V shaped periphery 271. The pulley 270 can be of any desired material such as synthetic plastic and preferably has a friction face on the periphery 271 to apply friction onto the exterior of the wound tube to aid in stripping.

The pulley 270, by the direct engagement of the tube receiver sleeve 245 thereon can provide support for the free end of the mandrel 54, and with the tube being stripped moving along the sleeve 245 can provide support for the tube and the mandrel '54.

The mode of operation will now be pointed out.

The motor 31, through the chain drive 32 eifects rotation of the shaft. 34. A strip of paper, with glue applied thereon by the intermittently operated glue applying rolls 25 is supplied and advanced by the carriage 41'onto the wires 30, and along the slot 64 in the mandrel 54 and.

cut off by the action of the knife (not shown) controlled 'by the knife cam 22, While the mandrel 54 is at rest and before it commences the rotating phase of its actuation.

The longitudinal advance of the paper strip and the advance thereof into winding position with respect to the mandrel 54 is effected by the operation of the carriage 41 and the actuation of the paper feed pins 57 and 59.

. Assuming that the carriage 41 has been retracted and is to be advanced for stripping a previously wound paper tube on the mandrel 54 by advancing the stripper arm 56 along the mandrel 54 and simultaneously advancing another paper strip along the wires 30. V

The support provided by the mandrel socket 68 at the free end of the'mandrel 54 must be retracted and remain out of the path of the paper tube as it is stripped from the mandrel 54 and this is efiected by the cam 74.

The stripper arm 56 can be considered as about to start to move toward the right in FIGS. 1A and 1B.

The upper presser b'ars'133 are all elevated together out of engagement with the paper tube by the respective cams 139, and remain in this condition during the stripping-and new paper feed.

i As the mandrel socket 68 is retracted the free end of the mandrel 54 tends to fall but support is then provided by the engagement of the sleeve 245 on the pulley 270.

The wound paper tube is stripped off the mandrel 54 over the free end thereof, along the tube receiving shaft 235-and the tube receiver sleeve 245, urged from the other'end by the stripper arm 56 which advances beyond the free end of the mandrel 54 and partially along the tube receiving shaft 235. The stripper arm 56 does not however move as far as the sleeve 245.

As the stripper arm 56 advances to the right the cams -117 retract the lower pressure bars to permit the stripper arm 56 to pass, and during the remainder of the cycle, the pressure bars 110 can be returned to their original upper positions in mandrel supporting and pressure applying position or can remain in retracted positions.

As the Wound tube is moved by the stripper arm 56, for stripping the tube, onto and along the sleeve 245 the tube is interposed between the sleeve 245 and the pulley 276.

The pulley 270, driven by the motor 261, and with a peripheral speed at the places of engagement with the tube substantially equal to advancing speed of the strip per arm 56 aids in the stripping and removal of the wound tube. If the wound tube should be advanced more rapidly along the sleeve 245 this is accommodated by the overrunning clutch in the transmission housing 262.

After the stripper arm 56 reaches the end of its stripping stroke it moves downwardly and returns toward its starting location. The mandrel socket 68 returns to its man drel supporting position and remains there until it is again retracted for tube stripping.

It willbe noted that the'auxiliary support for the mandrel provided by the pulley 270, the sleeve 245 and the I tube receiving shaft 235 is applied beyond thersur faces of the mandrel 54 onto which paper, is wound.

We claim; V 1. In a tube winding machine having a rotatable winding mandrel mounted at one endfor tubewin ding, members for driving said mandrel, a carriage movable along ,said mandrel having a tube'stripper carried thereby, a

member for supporting said mandrel at the other end thereof, members *for'retracting said supporting member in timedrelation to the movement of said tube stripper,

said free endrof said mandrel having an extensiontherebeyond of lesser diameter than said mandrelfa'nd a support member at a fixed height 'for engagement by a tube impelled along said extensionby said tube stripper, said extension spaced at a location beyond said mandrel, whereby upon retraction of 'said supporting member,

support is'provided for said mandrel;

2; A tube winding machine as defined in claim 1 in which i said support member has a portionrotatably mounted on an axistransverse to the longitudinalaxis of the extension for engagement by the tubeduringmovement past said support member.

3. Atube windingmachine as mounted on an axis transverse to the longitudinal axis of the extension for engagement by the tube during movement' past said support member, and positive driving means is provided for said rotatable 'portion. I

passes therealong and during the: remainder of the period in which the tube is being pushed oif the free. o as to limit sagging of the end of the mandrelnandrel.

7. Apparatusas defined in claim 6 in which said las means includes a roller supported on an axis transverseto said shaft. I

8. Apparatus as defined in claim 6 in which said last means includes 7 (e) a roller supported on an axis transverse to said shaft, and v (f) positive driving means for said roller.

9. Apparatus as defined in claim 6 in which said has a sleeve thereon for engagement with the interior of 1 the tube during'movement therealong-for stripping, said sleeve having at least one end thereof tapered. 19. Apparatus as defined in claim 6 in which adjust- 1ing members are'provided for determining the. vertical 7 defined in claim 1 in ,which said support member base portion rotatably' I 4. A tube winding machineas defined inclaim 1 in which said support member has a portion rotatably mounted on an axis transverse to the longitudinal axis of the extension for engagement by the tube during movement past said support member, positive driving means is provided for said rotatable portion,'and an overrunning clutch is interposed between said driving means and said rotatable portion. a I

SPA tube winding machine havinga rotatable winding thereon in tube form, members for actuating said maridrcl in cyclic relation, a carriagemovable along; said mandrel in predetermined timed relation and having a tube-stripper carried thereby, a cam shaft, members for actuating said'cam shaftga mandrel supporting member at the other end of said mandrel forsupporting said mandrel at said other endduringtube winding,'a. cam

on said cam shaft for controlling thepositioning ofsaid mandrel supporting member with respect -to saidman drel, said cam having a portion for retracting said mandrel supporting member to a position out of the path of movement of said tube and said tube stripper, tube'forrning material smoothing bars'above and below said mandrel,

, -cams on said cam shaft for advancing and retracting said bars with respect to the mandreL and anauxiliary supportfor said mandrel beyond said other end "and at a .fixed elevation supporting said mandrel during retraction of said mandrel supporting member and during stripping of said tube.

6. In an apparatus having a; rotatable mandrel about which sheet material is adapted to be wound in the forming of convolutetubes thereon, and said apparatus including a stripper for engaging the mandrel therebeneath and applying a pushing force against the rear end of the tube and longtiudinally toward and beyondthe free end of the mandrelfor stripping the tube off the-mandrel; the

engagement mandrel mounted at one 'end for winding sheet material positioning of said last means.

11. In an apparatus having a rotatable mandrel about which sheet materialis adapted to be wound in the. forming ofconvolute tubes thereon, and said apparatus in-. cluding stripper meansfor engaging and applying a pushing force against the rear end of-the tube and longitudi- 'nally towardthe free end'of the mandrel for stripping the tube ofl? the mandrel; the combination therewith of (a) a mandrel support engageable with said mandrel 7 intermediate its ends during winding of-the tube,- (b) means to release said support from engagement with said mandrel as the end of the tube approaches said support, (c) said mandrel having a shaft of lesser diameter than said mandrel extending from the free end thereof; ((1) means at a fixed location below said shaft'for supporting said shaft as the tube passes therealong and during the remainder of the period in which the tube is being pushed 01f the free'end of the mandrel,

(e) a plurality of longitudinally extending circularly.

- spaced and substantially longitudinally aligned upper and lower slickersbars adjacent upper and lower portions of said mandrel and normally spaced therefrom,-

and

(f) means for retracting said slicker bars during stripping of the tube. a. a 12. A' method of stripping elongate convolutetubes forwardly off the free end' of a mandrel whose rear end is journaled and about which each successive tube is wound which comprises the steps of V (a) engaging and applying a pushing force against the .Krieap end of the tube and longitudinally of the manre r (b) withdrawing supportfrom the tube as its front end approaches said point of support, and

(c) positively supporting said mandrel at a fixed level at a location beyond the free end of the mandrel and during passage of the tube past such location.

1-13 A method of making'elongate convolute .tubes'fro'mv V relatively thin sheet material utilizing an elongate rotatable mandrel about which sheet. material is adapted .to be wound and having a free end beyond which each successive tubeis moved upon being formed; said method comprising (a) rotating said mandrel and taking up the sheet'material thereon to form the tube while supporting the mandrel at its free end;

(b) then stripping the tube cit the free end of the mandrel before forming a succeeding tube thereon by applying a pushing force against the trailing end of the tube opposite from the free end of the mandrel,

(c) Withdrawing said support vfrom the mandrel before the tube reaches said-support; and

(d) supporting said mandrel at a fixed level and location beyond said free end while said first support is withdrawn while applying an assisting force for stripping at such location.

shaft 1 at a '14. A method of stripping elongate convolute tubes forwardly oil the free end of a mandrel about which each successive tube is Wound which comprises the steps of {'a) moving the formed tube forwardly toward said free end of the mandrel While positively supporting the tube and mandrel at a location at the free end of said mandrel,

(b) withdrawing support of the mandrel at the free end as the tube approaches the free end;

(0) positively supporting said tube at a fixed level at a location beyond the free end of the mandrel during the remainder of the period in which the tube is moving off the free end of the mandrel and therebeyond, and a (d) applying a stripping forge on said tube at said locatlon.

References Cited by the Examiner UNITED STATES PATENTS 3,073,218 1/63' Roediger et a1 938 1 FOREIGN PATENTS 401,220 8/09 France.

FRANK E. BAILEY, Primary Examiner.

BERNARD STICKNEY, Examiner. I

Claims (1)

1. IN A TUBE WINDING MACHINE HAVING A ROTATABLE WINDING MANDREL MOUNTED AT ONE END OF TUBE WINDING, MEMBERS FOR DRIVING SAID MANDRESL, A CARRIAGE MOVABLE ALONG SAID MANDREL HAVING A TUBE STRIPPER CARRIED THEREBY, A MEMBER FOR SUPPORTING SAID MANDREL AT THE OTHER END THEREOF, MEMBERS FOR RETRACTING SAID SUPPORTING MEMBER IN TIMED RELATION TO THE MOVEMENT OF SAID TUBE STRIPPER, SAID FREE END OF SAID MANDREL HAVING AN EXTENSION THEREBEYOND OF LESSER DIAMETER THAN SAID MANDREL, AND A SUPPORT MEMBER AT A FIXED HEIGHT FOR ENGAGEMENT BY A TUBE IMPELLED ALONG SAID EXTENSION BY SAID TUBE STRIPPER, SAID EXTENSION SPACED AT A LOCATION BEYOND SAID MANDREL,

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