US2112720A - Tube forming machine - Google Patents

Description

March 29, 1938.

C. STOCKSTROM TUBE FORMING MACHINE Filed Nov. 4, 1935 4 Sheets-Sheet l ATTOB/YE Y March 29, 1938. c. STOCKSTROM TUBE FORMING MACHINE Filed Nov. 4, 1935 4 Sheets-Sheet 2 //Y VE/YTO/B C424 from: m 0M ATTOB/YE'Y March 29, 1938. c. STOCKSTROM TUBE FORMING MACHINE Filed NOV. 4, 1935 4 Shets-Sheej; 3

March 29, 1938. c. STOCKSTROM TUBE FORMING MACHINE Filed Nov. 4, 1955 4 Sheets-Sheet 4 Va A fi L E m Patented 29,1938 2,112,720 v UNITED, STATES PATENT orr ca .rzzrzzezrxm. I Application ram 4,( No. 48,088

This invention relates generally to tube-form- Fig. is an enlarged cross-section taken on ing machines, and more specifically to an imline 5-5 of Fig. 3.

proved machine for forming tubes made from Fig. 6 is a sectional elevation of the glue-apflexible materials, such, for instance, as paper, plying mechanism of the machine. 5 cellulose tissue, celluloid, fabric, rubber, etc., Fig. 7 is a rear elevation of the mechanism 5 the predominant object of the invention being shown in Fig. 6. to provide an improved machine of this type Fig. 8 is a fragmentary section taken on line which includes adjustable means, which may H of Fig. 6. be adjusted even while the machine is running Fig. 9 is an enlarged, fragmentary view, partly 10 if this be necessary, so as to regulate the width in section and partly in elevation, of the braking 10 of tubing formed by the. machine. means for controlling rotation of the roll of paper All of the previously known tube-forming maor other material from which the sheet of mate chines with which I am familiar included each a rial is drawn to produce the tubing, and of the number of sets of tube-forming elements, which mil shaft adjusting means. had to be maintained on hand for producing Fig. 10 is a section taken on line IO-40 of i6 tubing of various widths with the aid of the ma- Fig. 9. chine. In other words, if tubing of a certain Fig. 11 is an enlarged, fragmentary sectional width was to be produced on one of these preplan taken on line li-ll of Fig. 3. viously known tube-forming machines, a certain- Fig. 12 is a fragmentary, sectional view illusset of forming elements would be associated with trating P Of e hi e When the same is the machine, and when it was desired to produce arrang f r Producing squar rectangular tubing of a different width the set of forming type tubing. elements previously used would have to be re- Fig. 13 is a section taken on line l3-l3 of Fig. moved from the machine, and another set of 12 and looking in the direction indicated by the forming elements adapted to produce tubing of arrow. A a

the desired width would have to be associated Fi 14i a a ntary r a v t n f ap with the machine. tion ofthe structure shown in Fig. 12.

The invention disclosed herein eliminates the I Fig. 15 is an enlarged cross section taken on need for a number of sets of forming elements line l5--i5 of Fig. 12.

for producing tubing of various widths, this de- In the drawings, wherein are shown for the 30 sirable end being attained by providing the impurposeof illustration, merely, two forms of the proved machine with forming elements which are t o A des e p ed machine permanently associated with the machine, and generally. Th ma hineAin ud s a r t n u ar which are adjustable so as to provide for proframe 0 w c s de p longitudinally 3.3 ducing tubing of different widths even while the extended channel elements i and transversely 36 machine is running, if this be required. Thus extended channe m nts 2; th se l n itudiin the use of'the improved machine there is no nally d tr nsversely extended elements bein necessity to perform the time-consuming tasks suitably secured together to provide a rigid frame of replacing the forming elements every time it 1' bed tru tur The longitudinally nded 4c is desired to change the width of the tubing l m nts I and 2 are support d y suitable gs 40 being formed, but instead it is merely necessary sllpperted y and extended p r y f for the operator of the machine to rotate a hand t frame bed of the machine is a superfi'ame wheel, in a manner to be hereinafter explained, structure 4 made P vertically disposed angle to change the adjfistment of the forming bars 5, secured adJacent to their lower ends to ments in order to produce tubing of the desired the bed of the machine and horizontally width; ranged bars 6,6, and fixed to the vertical bars l adjacent to the tops thereof and extended lon- 1 1s side elevation of the improved ma gitudinally and transversely of the machine.

chine Fixedto the opposed longitudinally extended to 32 8 plan View of machine illustrated elements I of the frame or bed of the machine A is a pair of bearings 8 (Figs. 1, 2,.and 3) which Fig 3 is an enlarged longitudinal section taken support a shaft 9 t t; is extended transversely on lin f of the machine. The shaft 9 supports a roll Ill Fig. 4 is a cross section taken on line H o! of paper or other material from which a sheet Fig. 3. of material S is drawn, said sheet of material 55 being passed through the tube-forming parts of the machine in a manner to be hereinafter described to produce tubing. The roll of material I0 is wound about a hollow core ii (Fig. 2)

through which the shaft 9 passes, said shaft the instrumentality of the set screws i2. Thus the roll of material It) is fixed to the shaft 9 for rotation therewith, the shaft rotating in the bearings 3 as the sheet of material S is drawn from said roll during operation of the machine. The sheet'of material S passes about guide rollers l3 and I4, as shown to the best advantage in Fig. 3, the guide roller l3 being supported by the opposed longitudinally extended elements -I and the guide roller 14 being supported by horizontally disposed elements I! extended from the rearmost vertical elements 5 of the superframe structure of the machine to elements 32.

In order to provide for shifting the shaft 3 longitudinally of its major axis so that the roll of material l9 may be moved transversely of the machine to properly position said roll of material, the machine includes an adjusting screw l8 (Figs. 9 and 10). This adjusting screw is supported by a bracket I! which is secured at H to one of the longitudinally extending elements I of the bed of I the machine (Fig. 2), and has an outer portion I1 in which an aperture is formed through which the adjusting screw it passes. Adjacent to this outer portion I'l of the bracket a collar i3 is fixedly mounted on the adjusting screw i6, and at the extreme outer end of said adjusting screw 9. hand wheel 19 is fixed thereto. The hub of the hand wheel l9 and the collar I8 contact with opposite faces of the outer portion ll of the bracket I], so that said adjusting screw is prevented from moving longitudinally, and also the inner end of the adjusting screw is provided with a smooth faced, reduced end portion it that extends into an aperture 29 formed in the longitudinally extended element i that supports the bracket ll, whereby said adjusting screw is supported for rotary movement by said longitudinally extended element l and the outer portion ll of the bracket II.

Fixedly mounted on the shaft 9 at a point above the adjusting screw I6 is a pair of spaced collars 2|, and mounted on said shaft in a position between said collars is a clamping device 22. The clamping device 22 is comprised of an element 22 and an element 22 said elements being provided with complementary curved seats which contact with the shaft 9. Also the element 22 is provided with an extension23 to which a bolt 24 is hingedly attached at 25, and the element 22 is provided with a wing 26 having an open-end slot that receives thebolt 24. The bolt 24 has mounted thereon a wing nut 21 which is adapted to be screwed against the wing 26 of the element 22* in order to move said element 22* and 22' into clamping engagement with theshaft 9. The element 22 of the clamping device 22 is provided with a downwardly projected extension 28 which is provided with a screw-threaded opening 23 formed therethrough, through which the adjusting screw l9 extends.

When, in the use of the machine, it is desired to shift the shaft 9 longitudinally of its major axis so as to properly position the roll of material I! transversely of the machine, the hand wheel is is rotated to rotate the adjusting screw 16, and

because the screw-threads'of said adjusting screw are in engaging relation with respect to the screwthreads within the opening 23 formed through the extension 23 of the element 22, the shaft will be moved as desired. Also the clamping device 22 serves as a braking device for the shaft 9, as by tightening the elements 22 and 22 against the shaft, with the aid of wing nut 21, rotation of said shaft may be retarded in proportion to the'pressure exerted against the shaft by the elements 22' and 22 Located adjacent to the guide ,roller I4 is an elongated glue receptacle which extends transversely of the machine, as shown in Figs. 1, 2, 3, 6, and 7. The glue receptacle 29 is supported for limited sliding movement on a pair of spaced angle elements 30, said angle elements being supported at their opposite ends by elements 3|, which are fixed at their forward ends to the rearmost vertical elements I of the superframe structure of the machine and at their rearmost ends by members 32 which are fixed to the elements 9 and to the longitudinally extended elements I of the bed of the machine. The glue receptacle 29 is capable of being moved transversely of the machine through the operation of an adjusting rod 33 which is provided with an enlarged, screwthreaded portion 33'. This adjusting rod is sup ported for rotation by the opposed elements 3 l as shown in Fig. 7, said rod being provided with a hand wheel 34 for operating same, and the glue receptacle having a downwardly extended element 35 which screw-'threadedly engages the screw-threaded portion 33' of the rod 33. By rotating the adjusting rod 33 the glue receptacle may be moved transversely of the machine to desired locations.

Secured to the glue receptacle 29 at opposite ends thereof are upstanding elements 35'-which support at their upper ends a horizontally disposed angle element 36. The angle element 36 has fixed thereto by means of a set screw 31 a hinge member 38, to which a downwardly extended element 39 is hinged at 40. The element 39 is substantially L-shaped when viewed as illustrated in Fig. 6, inasmuch as said element includes an extension 39' which is extended at an approximate right angle with respect to the main body portion of said element. The element 39 is provided with a boss 4i which supports a pin 4| on which aglue-distributing disk 42 is mounted for rotation, the lower portion of the disk 42 being 10- cated within the glue receptacle, so that it passes through glue therein during rotation of the 'disk.

Also, the peripheral edge of the disk 42 contacts with the sheet of material S as said sheet passes about the guide roller l4 (Fig. 3), whereby said disk is frictionally rotated by the moving sheet. The disk 42 has associated with it a glue scraper 43 which is so shaped as to embrace an edge portion of the disk, as shown to the best advantage in Fig. 8. The glue scraper includes a portion44 which is slidabiy mounted on the portion 33' of the element 39, said portion 44 being formed about said portion 39' in embracing relation with respect thereto. The portion 44 of the glue scraper is .providedqvith an outwardly extended lug 45 having a screw-threaded opening formed therethrough, which receives a. screw-threaded portion of a rod 49, said rod being supported for rotary movement by a bracket46' and having aweight 41 mounted thereon which is adjustable to different positions on the rod and is fixed in positions to which it is adjusted by a wing nut 41', The weight 41 through the action of gravity moves the peripheral face of the disk 42 into close contact with the sheet of material S,'and by rotating the rod 46 the scraping edge 43' of the glue scraper may be moved toward and from the peripheral edge of the disk so as to regulate the amount of glue applied to the sheet S by the disk 42.-

The illustrated embodiment of the improved machine includes a glue reservoir in the form of an inverted bottle 48 which is supported by a suitablesupporting structure 48'. Leading from the inverted bottle 48 is a glue conductor 48 whose discharge'end is located within the glue receptacle 29 (Fig. 3), said conductor being provided with a valve 48 which is adapted to control flow of glue from the inverted bottle 48 to the glue receptacle 29. In order to provide suilicient air pressure within the upper portion of the inverted bottle 48 to cause the glue to flow therefrom through the conductor 49, an air pipe 49 is employed (Fig. 2), this air pipe leading from a suitable source (not shown) of air under slight pressure to the upper portion of the inverted bottle, as, shown to the best advantage in Fig. 3.

Supported by the superframe structure of the machine is a pair of heads 50 which are mounted for sliding movement on a pair of rods 5| and 5| which extend transversely of the machine, as shown to the best advantage in Figs. 2 and 3. The rods 5| and 5| are mounted in supporting elements 5| (Fig. 2) formed on or fixed to the opposed side elements of the superframe structure 4, and also these rods pass through openings located adjacent to the lower ends of vertically disposed elements 52, which are secured at their upper ends to the element 6' that extends longitudinally of the superframe structure 4 at the approximate transverse center of the machine (see Fig. 2). The heads 59 are relieved or cut away as indicated at 53 in Figs. 2 and 3 to provide cavities in which the lower portions of the elements 52 are received when the heads are brought together at the center of the machine. The heads 50 are shaped as shown to the best advantage in Figs. 2, 3, and 4; that is to say, each of said heads includes a portion 50" which extends longitudinally of the machine which'is provided with openings formed transversely therethrough through which the rods 5| pass, and at the rear end of said longitudinally extended portion 5|! each head includes a downwardly extended portion 5|) provided at its lower end with a downwardly and rearwardly inclined portion 59.

-Fixed to the heads 59 are elongated tubeiorming elements 54 which are in the general form of narrow, elongated plates that extend in substantial parallelism forwardly of the machine. The forward portion of the forming elements are substantially horizontal, or parallel with respect to the bed of the machine, and adjacent to their rearmost ends said forming elements include upwardly inclined portions 54, as shown to the best advantage in Fig. 3. From the rear ends of the upwardly inclined portions 54 of the forming elements forwardly projected portions 54 are extended, which at their forward ends are turned upwardly as indicated at 54 in Fig. 3. The forming elements are secured to the heads 50 at their portions 54, and said forming elements contact with and are fixed to the inclined lower faces of the angular portions 50 of said heads.

In order to assist in supporting the heads 59 for movement'transversely of the machine, a rod 55 is provided. This rod, as shown in Fig. 4, is supported at its opposite ends by opposed, longitudinally extended elements of the superframe 7 lower ends thereof vertically disposed portions51' are provided through which openings are'formed, the rod 5| being passed through said openings. It is obvious that the heads 50 are adequately supported for free movement transversely of the machine by the rods 5|, 5|, and 55, the bracket elements 51 assisting in maintaining said heads in their proper positions.

The means for adjusting the heads transversely of themachine comprises a rod 59 which is supported iorrotation by oppositely disposed angle elements 60 (Fig. 4) The adjusting rod 59 is providedat one end with a hand wheel 6| to facilitate rotation of same, and said rod includes an enlarged intermediate portion 59' which is provided with right and left screw-threads designated, respectively, by the reference characters 59 and 59". The intermediate portion 59 of the adjusting rod 59 passes through screw-threaded openings formed through the heads 59, the part of said intermediate portion provided with righthand screw-threads being extended through the screw-threaded opening of one of the heads, and

'the part of said intermediate portion provided with left-hand screw-threads being extended through the screw-threaded opening of the other head. Obviously, rotation of the adjusting rod 59 will cause the heads 59 to move toward .or from each other, depending on the direction of rotation of the adjusting rod, and because the tube-forming elements 54 are carried by the heads, like movement will be imparted to said tube-forming elements.

At the forward portion of the machine A a plate 62 is provided, which is supported by the opposed, longitudinally extended elements I, and at opposite sides of this plate slotted elements 6.3 are fixed thereto which extend longitudinally of the forward portion of the machine. Thehslotted elements are secured adjacent to their opposite ends to the plate 62 by means of fastening devices 63', said slotted elements being raised slightly above the top face of the plate 62, as shown in Fig. 4, by suitable spacing members. Slidably secured to the slotted elements 63 are tube-forming members 64, the connections between said tube-forming members and said slotted elements being produced by bolts 55 whichpass through the slots of said slotted elements and through apertures formed through the tube-forming members, as illustrated in Fig. 4. Obviously the end portions of the tube-forming members 64 may be moved longitudinally of the slotted elements 63 to desired positions, in which positions said members 64 maybe secured by tightening the bolts 65. As shown to the best advantage in Fig. 11, the inner end portions of the tube-forming members 64 overlie the tube-forming elements 54, and said inner end portions of said tube-forming members I '64 are maintained at their proper elevation by adjusting screws 65, which pass through screwthreaded openings formed through the tubeforming'members and contact with and rest upon the top face of the plate 62. In order to maintain the adjustment of the adjusting screws 66, each thereof is provided with a lock nut 68'.

The improved machine includes guide pins 81 which under certain circumstances may be employed to aid in guiding the sheet of material into proper relation with respect to the tube-forming elements and members. Each of these-pins is supported by a head 68 which is mounted for sliding movement on a pair of rods 60 which extend transversely of the machine and are supported by the longitudinally extended elements I.

The head 6. of each guide pin 1 is provided with a downwardly extended portion 10, which is provided with a screw-threaded-opening formed therethrough, and an adjusting rod ll having right-hand screw-threads 'H and left-hand 'hand wheel I! which facilitates rotation of the adjusting rod. It is apparent that when the adjusting rod 1| is rotated the right and left-hand screw-threads thereof cause the guide pins to move toward or from each other, depending on the direction of rotation of said adjusting rod. Outward movement of the heads 68 with respect to each other is limited by a bar 68 which is fixed to one of the heads and is provided with a longitudinally extended slot through which a pin il carried by the other head extends (Figs. 2 and 11). When the end 88 contacts with the pin 68 further continued movement of the heads I is prevented.

At the forward end of the machine a presser element 13 is provided which contacts with the top of the tubing as it moves from the machine. This presser element I8 is of elongated, tubular formation as shown in Figs. 1, 2, and 3, and it is attached to an arm .14 which is provided at its upper end with a slot 14'. The arm 14 is secured to the longitudinally extended eleaperture formed in said element 6'. Because of the slot II the arm 14 may be secured to the element-6' in various positions so as to position the presser element in diil'erent locations longitudinally of the extreme forward portion of the machine.

when the machine A is to be placed in operation, the sheet of material 8 is drawn through the machine by hand and the forward portion of the sheet is moved under the elongated tube-forming elements 54, the opposite side portions of said sheet then being drawn upwardly about the opposite outer side edges of the tube-forming elements 54 and folded inwardly so'that their inner edge portions are in overlapping relation, as shown at S in Figs. 5 and 11. The tubeforming members 64 are then positioned as shown in Fig. 11, where they contact with the top faces of the inwardly turned' portions of the sheet of material S. The sheet of material S which is so drawn through the machine by hand has had a line of glue applied to it by the disk 42, and this line of glue, which is located beother. The forward end of the tubing is then drawn outwardly by hand to a suitable powerdriven reel (not shown) with which the forward end portion of the tubing is associated, so that the tubing will be wound thereon when the reel is rotated. The reel is then placed in operation, and the sheet 8 is drawn by said reel from the roll "I and is formed by the tube-forming elements 54 and the tube-forming members 64, and is then wound upon the reel. As already stated herein, the disk 42 applies a line of glue to the sheet 8, and because the glue receptacle which supports said disk may be adjusted transversely of the machine by the adjusting rod 3!, the disk may be adjusted to apply glue to any desired location on the sheet 8. Also, as shown in Fig. 2, the angle element 36 is provided with a plurality of the hinge members 38, and

the disk and its associated parts may be shifted certain types of tubing, more than one glueapplying disk may be employed.

It will be noted that the machine shown in Fig.1 includes a shaft 10 which corresponds with the shaft 9 already referred to herein. This shaft 16 has associated with' it the same parts and elements described in connection with the shaft 8, and said shaft 18 is intended to support a second roll of material when tubing to be produced is of multi-wall or two-piece structure. When a second roll of material is used in producing tubing, the sheet drawn therefrom may pass over the .guide roller 11 and then move over roller ll with the sheet-of material S drawn from the roll l0 into tube-forming relation with respect to the tube-forming elements 54 and the tube-forming members 84.

In Figs. 12, 13, 14, and a structure is illustrated which is employed in producing tubing of the square or rectangular type. In producing such tubing an extra pair of tubing-forming elements 8! is employed. These forming elements 80 include narrow, elongated plate portions extending longitudinally of the forward portion of the machine at points slightly above the narrow, elongated plate portions of the tube-forming elements 54, as shown in Figs. 12 and 15. The

tube-forming elements ll are supported by rods II, which are extended through openings formed through portions of the heads II, said rods having downturned portions ll (Fig. 12), thelower ends of which are inclined rearwardly and downwardly. The tube-forming elements ll are secured to the downturned portions of the rods 8|, and upwardly and rearwardly inclined portions of ,said elements contact with the lower faces of the downwardly and rearwardly inclined lower portions of said rods. Each head is provided with a clamping screw 02 for clamping the associated rod 8| fixedly in position with respect thereto. Also, each rod II has clamped thereto a member 83 (1 185.12 and 14) which is provided with a portion 83 that overlaps a side face of the associated head, and each portion 83' supports an adjusting screw u that contacts with the adjacent side face of the associated head Bl. The members 83 are each provided with'a slit 8!" to provide portions which clamp the associated rod 8|, and these clamping portions are drawn into clamping contact with the rod by a screw ll.

In order to produce accurately formed square or rectangular type tubing the forming elements 80 must be precisely positioned with respect to the forming elements 54, and such fine adjustment may be obtained by manipulating the adiusting screws 84 infcontact with the heads 50 so as to rotate the rods 8| and thereby move the tube-forming elements 88 'to the desired positions. The inner ends of the adjusting screws 84 are maintained in close contact with the heads 58 by contact of the paper with the tube-forming elements 88, hence rotation of the adjusting screws in either direction produces rotary movement of the rods 8| in one or the other direction. When the rods 8| have been adjusted to desired positions they may be clamped in such positions by the screws 82.

In producing square or rectangular type tubing plates 84 are employed whose inner edge portions are interposed between the narrow, elongated plate portions of the tube-forming elements 54 and 88, as shown in Fig. 15. These plates are supported by arms 85 which are attached to said plates at their inner ends and are fixed at their outer ends-to the slotted elements 68 by suitable fastening devices 85. The pairs of the arms 85 at opposite sides of the plates 84 are connected together by arms 88, and also said plates 84 are maintained at their proper elevations with respect to the plate 62 of the machine by means of adjusting screws 81 similar to the adjusting screws 86 associated with the tubeforming members 64, said adjusting screws 81 at their lower ends contacting with and resting upon said plate 62 and being provided with lock nuts to maintain their adjustment.

The use of the machine in producing square or rectangular type tubing is substantially the same as in producing tubing of the type illustrated in Fig. 5, the only difl'erence being that the opposite side edges of the tubing are folded inwardly as shown in Fig. 15 through the use of the extra tube-forming elements and the plates 84.

It is obvious, in view of the foregoing description of the improved machine disclosed herein, that tubing of the type shown in Figs. 5 and 15, and of various other types which 'need not be described in detail herein, may be made in various widths by merely adjusting the heads 58 trans versely of the machine toward or from each other, this being accomplished by mere rotation of the hand wheel 6| shown in Figs. 1 and 4. Thus the necessity that a number of sets of tubeforming elements for producing tubing of different widths be maintained on hand is entirely eliminated, and the operation of producing machine-made tubing is greatly. simplified. Also, in the use of the improved machine, if the tubing being produced should run slightly wider or narrower than desired, the heads 50 may be adjusted while the machine is operating to correct the error in the tubing width.

I claim:

1. A tube-forming machine including a pair of heads, means for supporting said heads for adjustment transversely of the machine, a pair of vertically spaced tube-forming elements carried by each of said heads, means for adjusting one tube-forming element of each pair of tube-forming elements with respect to the associated tubeforming element, means for moving said heads and said tube-forming elements transversely of the machine so as to provide for producing tubing of various widths, and tube-forming members co-operatively associated with said tube-forming elements. I

2. A tube-forming machine including a pair heads, means for supporting said heads for adjustment transversely of the machine, said means including spaced elements on which said heads are slidingly supported, members secured to and extended from said heads, and an element slidingly engaged by said members, tube-forming elements carried by said heads, means for moving said heads and said tube-forming elements transversely of the machine so as to provide for producing, tubing of various widths, the lastmentioned means including an element supported for rotary motion and provided with right-hand and'left-hand screw-threaded portions which cooperativly engage said heads and are adapted to move same toward and from each other on rotation of said screw threaded element, and tube-forming members co-operatively associated with said tube-forming elements.

4. A tube-forming machine including a pair of heads, means for supporting said heads for adjustment transversely of the machine, said means including spaced elements on which said heads are slidingly supported, members secured to and extended from said 'heads, and an element slidingly engaged by said members, tube-forming elements carried by said heads, means for moving said heads and said tube-forming elements transversely of the machine so as to provide for producing tubing of various widths, the lastmentioned means including an element supported for rotary motion and provided with right-hand and left-hand screw-threaded portions which cooperatively engage said heads and are adapted to move same toward and fromfeach other on.

rotation of said screw threaded element, tubeforming members co-operatively associated with' said tube-forming elements, and means for adjustabiy securing said tube-forming members in place.

5. A tube-forming machine including a pair of heads, means for supporting said heads for adjustment transversely of the machine, said means including spaced elements on which said heads are slidingly supported, members-secured to and extended from said heads, and an element slidingly engaged by said members, tubeforming elements carried by said heads, means for moving said heads and said tube-forming elements transversely of the machine so as to provide for producing tubing of various widths, the last-mentioned means including an element supported for rotary motion and provided with righthand and left-hand screw-threaded portions which co-operatively engage said heads and are adapted to move same toward and from each other on rotation of said screw-threaded element, tube-forming members co-operatively associated with said tube-forming elements, and means including slotted members extended longitudinally oi the machine for adiustably securing said tube-forming members in place.

6. A tube-forming machine including a pair of heads, means for supporting said heads for adjustment transversely of the machine, said means including spaced elements on which said heads are slidingly supported, members secured to and extended from said heads, an element slidingly engaged by said members, and brackets fixed to said members and arranged in sliding relation with respect to one of said spaced elements, tubeiorming elements carried by said heads, means for moving said heads and said tube-forming elements transversely of the machine so as to provide for producing tubing of various widths, the last-mentioned means including an element supported for rotary motion and provided with righthand and left-hand screw-threaded portions which co-operatively engage said heads and are adapted to move same toward and from each other on rotation oi said screw-threaded element, and tube-forming members co-operatively associated with said tube-forming elements.

7. A tube-iorming machine including a pair of heads, means for supporting said heads for ad- ,iustment transversely oi the machine, said means including spaced elements on which said heads are slidingly supported, members secured to and extended iromsaid heads, an element slidingly engaged by said members, and brackets fixed to said members and arranged in sliding relation with respect to one of said spaced elements, tubeiorming elements carried by said heads, meansfor moving said heads and said tube-forming elements transversely of the machine so as to'provide for producing tubing 01' various widths, the last-mentioned means including an element supported for rotary motion and provided with rightsupporting members when the heads are drawn inwardly to the limits of their movement.

CARL BTOCKB'IROM;

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