US2712789A

US2712789A - Means for tightening and adjusting flexible bands on printing cylinders of rotary presses

Info

Publication number: US2712789A
Application number: US332642A
Authority: US
Inventors: Leeberg Edward
Original assignee: Individual
Current assignee: Individual
Priority date: 1953-01-22
Filing date: 1953-01-22
Publication date: 1955-07-12
Anticipated expiration: 1972-07-12

Description

July 12, 1955 E. LEEBERG 2,712,739

MEANS FOR TIGHTENING AND ADJUSTING FLEXIBLE BANDS ON PRINTING CYLINDERS OF ROTARY PRESSES Filed Jan. 22, 1955 3 Sheets-Sheet l INVENT OR EDwAEDLEEBE/ee,

BY $18 2 la: 1 W:

ATTORNEY July 12, 1955 E. LEEBERG MEANS FOR TIGHTENING AND ADJUSTING FLEXIBLE BAN ON PRINTING CYLINDERS OF ROTARY PRESSES Filed Jan. 22, 1953 5 Sheets-Sheet 2 1N VENTOR ATTORNEY July 12, 1955 0 Filed Jan. 22 1955 N PRINTING CYLINDE E. LEEBERG MEANS FOR TIGI-ITENING AND ADJUSTING FLEXIBLE BAN 2,712,789 DS RS OF ROTARY PRESSES 5 Sheets-Sheet 5 INVENTOR E0 WA/EDLEEBEEG,

I ATTORNEY 2,712,789 Patented July 12, 1955 MEANS FOR TIGHTENING AND ADJUSTING FLEXiBLE BANDS 3N PRINTING CYLIN- DERS OF ROTARY PRESSES Edward Leeberg, Roselle, N. J. Application January 22, 1953, Serial No. 332,642 6 Ciaims. (Ci. 101-4151) This application is a continuation-in-part of my application Serial No. 198,877 filed November 3, 1950 now abandoned.

The invention relates to rotary printing presses and more particularly to means for adjusting and tightening flexible printing bands or pads on the printing cylinders of such presses.

Since the advent of quick drying inks, it has been possible to greatly speed up the operation of rotary printing presses and particularly multi-color rotary printing machines. Of late years the printing members which have been applied to the printing cylinders of such rotary presses or machines, have been in the form of flexible bands or pads having the printing indicia thereon, such flexible printing members being drawn tight against the cylindrical surface of the printing cylinder and held by various means. In some instances these flexible printing bands or members have been made of rubber or rubber-like material with textile fabric such as canvas incorporated in their bases to prevent longitudinal stretching, or the thick rubber or rubber-like body of the printing band on which the printing indicia are formed, has been cemented or otherwise suitably united to a canvas or other fabric web or band. To enable the printing indicia to extend over substantially the entire circumferential surface of the printing cylinder, the two ends of the band or pad have been inserted in a longitudinal slot opening into the hollow cylinder or chamber therein, and one or two reels have been used to draw the band tight against the cylinder.

In order for a rotary press to produce good printed matter, it is necessary that the flexible printing pad or member be properly positioned circumferentially of the cylinder and also be tight against all opposed portions of the outer surface of the printing cylinder; and in multicolor work, it is necessary that the printing members on the several printing cylinders have exactly the same relative positions around circumferences of the cylinders in order to obtain proper registration of the different colored impressions on the paper Web as it travels from one cylinder to the next.

With these high speed multi-color rotary presses using such flexible printing members, it requires a great deal of time and skill to obtain proper longitudinal alinement and registration of the impressions. Various gage devices have been proposed to assist in properly positioning the members on the cylinders, and while the members are carefully made with respect to the positioning of the printing indicia thereon and with respect to the manner of anchoring of the ends of the member in the cylinder, yet the adjustment of the members circumferentially around the cylinders has been largely a matter of trial and error. Usually a number of trial runs of the press must be made before proper registration is obtained. I have discovered that by attaching both ends of the flexible printing member to a winding reel in the cylinder adjacent its slot, mounting ends of the reel in opposed and adjustable eccentrics in the ends of the cylinder and the band is found 2 providing independent actuating and locking means for the reel ends, I can adjust the printing member circumferentially around the cylinder to an extent sufficiently to properly position the member with respect to a gage such as disclosed in my pending application Serial No. 193,878 filed November 3, 1950 Gage for Positioning and Registering Printing Member on Cylinders of Rotary Presses, the said application having matured in Patent No. 2,641,181. The principal object of the invention is V to provide a simple and practical means for bodily shifting the printing member circumferentially around the cylinder to assist in quickly obtaining properly registered impressions by a multi-color press and to properly position the printing member on the cylinder of any rotary press.

The above stated mounting and adjustments of the reel also enables me to quickly and easily remove any skew from the printing member so that all of the indicia bear: ing portions of it will tightly contact the periphery of the cylinder. In the past considerable difliculty has been experienced in drawing and holding the printing member tight against all portions of the outer surface of the printing cylinder due principally to the practical impossibility of obtaining uniformity of the anchoring ends of the bands and of anchoring such ends squarely and uniformly to the reel or reels. Frequently when the reel is turned to Wind the band thereon to tighten it, to be askew on the cylinder with one side tight and the other loose. Such printing hand must be squarely on the cylinder with all portions in firm contact with the cylinder surface in order to produce satis factory printed matter, and especially when the printing cylinder is rotated at high speeds and when multi-color printing is done. It is an object of my invention to overcome the above indicated diificulties by providing a simple and practical means for adjusting and tightening such flexible printing pads or members on the cylinders of rotary presses.

Another object of the invention is to provide in a printing cylinder means for eccentrically adjusting the bearings at both ends of a reel to which both ends of the printing band or pad are attached so that any looseness of either side of the band may be quickly taken up and so that if the lines of printing indicia are askew they may be brought into parallelism with a longitudinal gage bar by rotating the eccentrics in opposite directions.

Another object is to provide simple and effective means for adjusting and locking the eccentric bearings for the reel and also locking the reel in its adjusted position after it has been rotated to tightly stretch the printing member on the cylinder.

Another object is to provide in a machine of this character improved means for securing the ends of a flexible printing band or pad to the printing cylinder.

With the above and other objects and advantages in View, the invention resides in the novel combinations and arrangements of parts and the novel features of construction hereinafter described and claimed, and illustrated in the accompanying drawings which show the present preferred embodiment of the invention.

In the drawings:

Fig. 1 is an elevation of one end of a printing cylinder having the invention applied thereto and also showing the gage device of my application Serial No. 193,878, the

cylinder shaft being in section;

Fig. 2 is a top plan view with parts broken away;

Fig. 3 is an enlarged detail sectional view on the line 3-3 in Fig. 2;

Figs. 4 and 5 are views similar to Fig. 3 but showing some of the parts in different positions;

Fig. 6 is a longitudinal section on the line 6-6 in Fig. l with the gage device omitted;

fixed to a shaft 11 journaled for rotation in bearings 12 'on the frame 13 of a rotary press, these parts being conventionally illustrated. Such rotary cylinders are usually hollow and are made in various lengths and diameters. As shown, the cylinder 16 has flat end walls 14 connected by a cylindrical surface portion in which is formed a slot 15 extending longitudinally from one end to the other of the cylinder.

The numeral member commonly called has a base 17'" of canvas or thick body portion 18 of rubber, rubber-like composition or plastic material on which are formed raised printing indicia 19, the latter forming the printing surface. While the body 18 may be cemented to the fabric, the latter is 16 denotes generally a flexible printing a printing pad or band. It

preferably impregnated with the rubber or other material and forms an integral part of the printing member. The ends of the fabric extend beyond the ends of the body 18 and are formed with horns 20 to receive anchoring pins or rods 21 for the purpose of securing said ends to a winding reel 22 arranged in the cylinder opposite its slot 15. The reel 22. which is mounted for rotation and also for the angular adjustment of its axis with respect to the axis of the cylinder, as hereinafter described, is preferably in the form of a cylindrical rod having two circumferentially spaced grooves. 23 which extend longitudinally and have undercut walls so that the grooves are of, dove-tail shape in cross section. The printing band extends around the cylinder with its ends extending into the slot 15. The hems 2% are successively inserted in the grooves 23 and anchored therein by the pins 21 which have a diameter greater than the narrow outer portions of the grooves. When the ends of the printing band are thus fastened to the reel, it will be seen that when the latter is rotated in a clockwise direction in Fig. 3, both endsof the band will be pulled into the slot to tighten the band on the cylinder.

Before describing the improved means for mounting and adjusting the winding reel, I will briefly explain the. gage device of my application Serial No. 193,878, since when it is used on cylinders having the improved reel mounting and adjusting means, the printing members on the several cylinders of a multi-color press may be quickly and easily positioned to obtain proper registration of the different impressions in multi-color work or the printing member'rnay be properly positioned on the cylinder of any kind of a rotary press. The gage device is to be applied successively to the several cylinders of the press, and to be positioned on each cylinder in the same-relative position, that is, at the same distance from the slot of each cylinder. The device comprises two gage members or elements 49 and The element 49 is a vertically disposed plate of arcuate or crescent shaped to be adjustably positioned adjacent to one end of the printing cylinder and to be used to position the printing members on all of the cylinders alineinent in the direction of movement of the paper web. The other element St) is a horizontally disposed bar to extend longitudinally of the cylinder and to be mounted for swinging movement toward and from the surface of the cylinder and the band. This element 55 is used in squaring the printing band or member on the cylinder so to dispose the lines of printing indicia on the printing surface 1? at right angles to the edges of the paper, and also in positioning the several members in the same relative positions circumferentially of the several cylinders for obtaining proper other textile fabric, and a inn registration of the several colored imprints. The gage device includes a longitudinally disposed cylindrical rod or shaft 40 parallel with the axis of the cylinder and of greater length than the latter. This rod or bar is removably and adjustably fixed in openings in two standards 41 by set screws 42. The gage plate 49 is fixed to a U-shaped slide 54 having apertured

arms

55 and 56 to receive the rod 40. The slide straddles one of the supporting standards 41 and the arm 56 is on a portion of the rod 4% which extends beyond that standard in order to dispose the plate 49 close to one edge of the cylinder. The lower edge of the gage plate 49 is curved to conform to the curvature of the cylinder. and may be of any length. One side edge of the raised printing indicia 19 on the band may be abutted against this plate to position the printing band lengthwise of the cylinder, and the slide is then looked to the rod by a set screw 57 in the arm 56. When the plate is thus set on one cylinder, the device is transferred to the other cylinders successively and used to position the bands lengthwise of the cylinders so that all of the bands will be in alinement. The gage element 54) is a fiat bar having a beveled straight edge and is fixed to two arms 59 apertured to receive the rod 4% about which they swing so the beveled edge may move toward and from the printing band. The gage bar is prevented from shifting longitudinally by the arms 59 contacting the standards. The bottoms of the standards 41 conform to the curvature of the cylinder and carry locating pins or dowels 44, Fig.1, to fit in locating holes formed in each cylinder near its ends. These locating holes in all cylinders are the same distance from the cylinder slots so that gage device may be successively transferred to the several cylinders and will occupy the same relative position on each one. The standards are removably secured to each cylinder by screws 46 in their bases engaged with properly positioned threaded holes in the cylinders. When the device is applied to a cylinder, the beveled or straight edgeof the gage bar 5'53 is always parallel with the axis of the cylinder and when it rests on the printing bands on successive cylinders it will always be the same distance from the cylinder slots. The gage bar may therefore be,

used to properly position the different sprinting bands circumferentially around their cylinders for registration of the successive imprints by providing the bands with gage marks having the same relative positions or using a longitudinal edge of the raised indicia portion 19 as a gage mark, and by circumferentially shifting the bands on their cylinders to move the gage marks or the edges of the printing portions 19 into register or alinement with the edge of the bar 50. The amount of such .c'ircurnferential shifting of the bands in order to obtain perfect registration is very slight because in making the bands an efiort is made to make them as nearly uni-. form as possible with respect to the dimensions of their parts, the positioning of the printing indicia relative to their ends, etc. In the past such cir umferential adjust: ment of the printing bands has been diflicult'and time consuming; and in addition to that adjustment it frequently happens that when a band is tightened on a cylinder it may be askew with one edge of it loose and not firmly in contact with the cylinder, or the lines of type may not be parallel with a gage bar extending lengthwise of the cylinder. This invention enables these difficulties to be overcome quickly and easily by unskilled workers.

The eccentric mounting .and adjustment of the reel rod 22 comprises the formation, in the flat end walls of the cylinders adjacent the ends of the slot 15, of circular openings 24 which are longitudinally alined and which rotatably receive eccentric bearing members 25 in the form of circular plates or disks having eccentrically positioned bearing openings 26. The reel has at its ends reduced and concentric journal portions 27 which are' rotatably disposed in the bearing openings 26 to rotatably support the reel and also permit it to be angled slightly with respect to the axis of the cylinder. This angling of the reel may be taken care of by a loose fit of the journal portions 27 in the openings 26 or by giving those portions or those openings a slight longitudinal taper, but 1 preferably form the cylindrical portions 27 with a slight longitudinal curvature which is shown in Fig. 10 to an exaggerated extent for the sake of clearness. The extreme ends of the reel are formed with further reduced and concentric portions or projections 29 which extend outwardly from the journals 27 and beyond the outer faces of the eccentric disks. These projections or extensions 29 are formed with means to be engaged by a wrench, crank handle or other tool used for rotating the reel to wind the printing band thereon. I preferably form the ends of said projections with wrench or other tool engaging sockets 38 which may have fiat faces or be of other non-circular shape. The outer faces of the projections 29 are also of hexagonal or other fiat faced form to be received in similar shaped sockets or openings 31 formed in the inner ends of reel-locking arms or plates 32. The eccentric disks 25 are also formed with integral and radially projecting arms 36 disposed at their outer ends as shown in Fig. 8. These arms 36 are wider than the diameter of the disks to provide shoulders 36 which abut the cylinder walls 14, as do also the flat under faces of the projecting portions of the arms. The bearing openings 25 extend through the inner portions of the arms 36 and the outer faces of the latter are flat but have portions opposite the disks cutaway, the openings 26 fiat faced wrench engaging portions 36 to facilitate the rotation of the eccentrics. Formed in the outer portions of the arms 36 are slots 37 concentric with the disks and adapted to receive screws or bolts 38 threaded in openings in the walls 14 to lock the eccentrics in adjusted positions. The inner faces of the reel locking arms 32 are flat and lie against the fiat outer faces of the eccentric locking arms 36, and they also engage the shoulders 2% formed at the ends of the journal portions 27 by reducing the ends 29 of the reel. The reel is thus held against endwise shifting. The widened ends of the arms 32 are formed with arcuate slots 34 concentric with the reel and its bearing openings 26. A locking screw or bolt 35 is disposed in each slot 34 and engaged with a threaded opening 33 in the fiat outer face of the coacting arm 36. While the

screws

35 and 38 are shown as having heads with screw driver kerfs, the ends of the screws are preferably formed with flat walled sockets to receive a turning wrench or tool. The shanks of these screws or bolts are of slightly less diameters than the widths of the slots so that there will be no binding action when the parts are adjusted.

With the ends of the printing band connected to the reel as shown in Fig. 3, it is only necessary to rotate the reel in a clock-wise direction in order to tighten the band on the cylinder. When that is done the band may be in registering position and without either side edge being loose or askcw, but because of imperfections in manufacture, some adjustment may be necessary. With respect to removing any skew in the band when it has been tightened, the eccentrics 25 may be disposed as shown in my application Serial No. 193,877 or in Fig. 3 of this application or in various other positions so that reel will be slightly angled with respect to the axis of the cylinder when one or the other eccentrics is turned in the proper direction. A slight adjustment of one or the other of the eccentrics will remove any skew in the band but if the latter is not in registering position, a slight shifting of the band bodily around the cylinder may be necessary. I have discovered that when the eccentrics 25 are set as shown in Fig. 3 and the reel and band ends are in the positions shown, I can bodily shift the band to a slight extent around the periphery or circumference of the cylinder, by rotating both eccentrics in the same direction to loosen the band end portions P and P between the as at 36 to provide around i longitudinal edges of the slot 15 and the point on the reel to which they are tangent, and then rotating the reel in a direction to wind the band ends thereon. Upon reference to Fig. 3 it will be seen that the line of eccentricity, that is, the line connecting the axis A of the eccentric to the axis B of the reel 22, coincides with a radial dot-and-d'ash line L passing through the axis C of the cylinder 11) and the center of the slot 15. The eccentrics are thus in a neutral position and the axis B of the reel is equally distant from the longitudinal edges of the slot 15. It will also be noted that the diameter of the reel is greater than the width of the slot and hence the end portions P and P of the band are tangential to the reel. At that time a gage mark G on the band and represented by a longitudinal edge of the raised indicia portion 19, may be slightly away from the edge of the gage 50, as shown in Fig. 3, and in order for the band to be in registering position on the cylinder the mark G must be brought into line with the edge of the gage. Hence the band must be bodily moved around the cylinder a slight distance counter-clockwise in Fig. 3. When both eccentrics 25 are rotated in the direction of the arrow R in Fig. 3 to the position shown in Fig. 4, without rotating the reel in its bearings, the axis B of the reel is shifted from the center line L in the direction of the left-hand edge of the slot since the diameter of the eccentrics are substantially greater than the diameter of the reel 22. While that creates slack in both end portions P and P, the slack in the portion P is greater than that in the portion P, as seen in Fig. 4. When the reel is then rotated in the direction of the arrow S in Fig. 4 to the position shown in Fig. 5, that is, in the direction to wind the band on the reel, the slack in the portion P will be removed before the portion P is taught, and hence the continued pull of the reel on the portion P will cause the band to shift around the cylinder until both end portions are equally taught and assume the tangential positions shown in Fig. 5. That will cause the gage mark G to be moved into line with the edge of the gage bar 50 if the eccentrics were rotated the proper amount. if not the operation is repeated. The above described shifting of the band around the cylinder will take place without regard to the location of the spaced points on the periphery of the reel at which the ends of the band are anchored so long as the end portions P and P are tangentially disposed in the initial tight position of the band shown in Fig. 3. The circumferential shifting movement of the band is very slight but suflicient to enable the gage mark G to be alined with the edge of the gage bar 59 if it is not so alined when the band is initially tightened. For the sake of clearness the eccentrics in Figs. 4 and 5 have been shifted to an extent that may ordinarily be unnecessary; but the range of adjustment or" the eccentrics may be increased by making the arms 36 wider to enable the slots 37 to be made longer. It will also be noted that due to the hexagonal shape of the projections 29, the arms 32 may be applied to them at different points around the axis of the reel, thus increasing the range of rotatable adjustment of the latter by the slot and screw fastening means 34, 35. It will be further noted that when the reel has been rotated to tighten the band and then fastened by tightening the screws 35, it is possible to increase the tension on the band by rotating both eccentrics in a direction opposite that of the arrow R in Fig. 3 but that is not the real function of the device. The eccentrics are primarily used to bodily shift the band around the cylinder in either direction by adjusting both of them in the same direction to shift the axis of the reel laterally of the slot, and to remove any skew in the tightened band or to aline the type with the gage bar by adjusting one or the other of the eccentrics.

In using the device, the reel locking arms 32 moved to expose the ends of the grooves 23. One end of the printing band is inserted in the cylinder slot 15 and its hem inserted in one of the grooves 23. A pin 21 is are 1'6- then inserted in that hem from an end each end of the reel to fasten of that groove which opens through one of the journals 27. The reel is then turned to bring its other groove opposite the slot and the hem on the other end of the band is inserted in such groove so that a pin may be similarly inserted in it. After the ends of the bands are thus anchored to the reel, the latter is rotated by a wrench to tighten the band. The locking arms 32 are then applied to the projections 2? to 'best position with regard to the threaded holes 33 and the slots 34. The screws 35 are then applied and tightened to lock the reel with the band tight. It will be noted that the arms 32 cover the ends of the grooves 23 and prevent the pins from working out. When the screws 35 are tightened the arms 32 become fixed on the eccentric arms 36 which may be initially set with the screws 38 at the center of the slots 37 so that the eccentrics are in their neutral positions shown in Figs. 1, 3 and 6. If after that tightening operation, the band is loose along either of its edges, the slack may be taken up by loosening one of the screws 38 and swinging shift its eccentric 25 so as to remove the slackness in the band. That screw 38 is then tightened, and if necessary the reel may be further adjusted as above set forth to tighten the band. f when the band is tight, the gage mark G is not in line with the edge of the gage bar 55) both of the eccentrics are adjusted in the same direction as above explained. It will be understood that the eccentrics may be adjusted in either direction to move the gage mark toward or away from the slot 15. By rotating the eccentrics in opposite directions parallelism of the lines of type with the gage 50 is obtained. These adjustments may be quickly and easily made. This invention in connection with the gage device of my application Serial No. 193,878 enables a relatively unskilled worker to readily and accurately set the several printing bands in registering and aligned positions on the cylinders of a multi-color rotary press.

From the foregoing, taken connection with the accompanying drawing, it will be seen that novel and advantageous provision has been made for carrying out the objects of the invention, and while preferences have been disclosed, attention is invited to the possibility. of making variations within the scope of the invention as claimed.

1 claim: I

1. In means for bodily shifting a printing band circumferentially around a printing cylinder for registration with a gage, the combination of a printing cylinder having a longitudinal slot in its periphery, a band winding reel in the cylinder opposite said slot, a pair of longitudinally alin'ed eccentrics, one being rotatably mounted at each end of the cylinder, means associated with each eccentric mounting said reel for rotation and limited angular movement, means associated with the reel for fastening to it both ends of a printing band which extends around the periphery of the cylinder and has its ends extending into said slot, said reel having a diameter substantially greater than the width of said slot, said alined eccentrics having a diameter substantially greater than the diameter of said reel and also having this axis disposed in a radial plane passing through the center of said slot, whereby when the reel has its axis in said radial plane and is rotated to tighten the band, the end portions of the latter will extend tangentially from the when the two eccentrics are rotated in the same direction the axis of the reel will be shifted laterally of said plane to produce an unequal slack in the end portions of the band, and when said reel is then rotated to remove such slack the body portion of the band circumferentialiy around the periphery of the cylinder, means between each eccentric and the cylinder fastening them in adjusted positions, and means associated with the latter in an adjusted position.

the coacting arm 36 to will be shifted X threaded fastenings in d f flexible rintin reel to the opposed longitudinal edges of the slot, and 1 boih en S o a p g 2. The structure of claim 1 in which each of said reel fastening means is carried by and adjustably fixed to one of said eccentrics to move therewith when the latter is adjusted and thereby hold said reel against rotation.

3. The structure of claim 2 in which said cylinder has fiat end walls formed with circular openings opposite the ends of said slot, in which said eccentrics are circular plates which rotate in said openings and have enlarged outer portions providing radially projecting shoulders to limit the inward movement of the plates into said openings and also providing radially projecting arms to lie against the flat'outer faces of the respective end walls,

said arms having slots concentric v with said plates, threaded fastenings in said slots to hold said plates in adjusted positions in said openings, and in which said fastening means for the reel ends are removably and adjustably mounted on the enlarged outer portions of the respective plates.

4. The structure of claim 3 in which the ends of said reel project beyond said circular plates and their en larged outer portions, and in which said fastening means for the reel ends are plates detachably and non-rotatably engaged with the respective projecting ends of the reel and have radially projecting portions to lie against the outer faces of the respective enlarged portions of the circular plates, the last mentionedradially projecting portions having slots concentric with the reel axis, and the last mentioned slots for detachably and adjustably fastening said reel fastening plates.

5. The structure of claim 3 in which said circular plates have eccentrically positioned bearing opening which extend-through said enlarged outer portions; in which said reel has near its ends concentric journal portions to rotatein' said bearing openings and also at its ends reduced projections which of the enlarged outer portions of the circular plates, said reel also having circumferentially spaced undercut longitudinal grooves which also extend. through said journal portions, a flexible printing band extending around the cylinder and into said slot, the ends of said band having hems disposed in said grooves, band anchoring pins inserted in said hems through the portions of said grooves in said journal portions; and in which said fastening means for the reel ends are radially disposed plates removably and non-rotatably engaged with said projections at the ends of said reel, said last mentioned plates being disposed against the outer faces of the enlarged outer portions of the respective circular plates and closing the ends of said grooves to retain said pins in the hems of the band, said last mentioned plates also having slots concentric with the axis of the reel, and threaded fastenings in said last mentioned slots to fasten the reel againstrotation in its bearing openings.

6. Means for fastening a flexible printing band around a printing cylinder and independently tightening either edge of the band to remove slack, comprising a cylinder having a longitudinal slot and end walls provided with opposed circular openings adjacent the ends of said slot, a pair of circular plates independently rotatable in said openings and having eccentrically positioned bearing openings, a winding reel within the cylinder opposite said slot, means associated with said reel foranchoring band which may be disposedaround the cylinder with its ends extending through the slot, whereby when the reel is rotated in one direction the band will be tightened on the cylinder, concentric journal portions on the reel adjacent its ends and mounted for rotation and angling movement in said bearing openings, locking arms extending radially from the outer por tion of said plates for contact with the cylinder end 7 walls and formed with arcuate slots concentric with said circular plates, screw threaded fastenings in said arcuate slots to adjsutably clamp said arms to the cylinder ends.

extend beyond the outer faces a polygonal shaped projection at each end of said reel extending outwardly from said journal portions, reel locking arms having polygonal openings detachably and adjustably engaged with said projections, the last mentioned arms having arcuate slots concentric with the reel axis and overlying the first mentioned arms, and screw threaded fastening in the arcuate slots of said reel locking arms to adjustably clamp the latter to said plate locking arms.

References Cited in the file of this patent UNITED STATES PATENTS Burkhardt Dec. 30, 1879 Barber May 24, 1927 Tornberg July 4, 1939 Neilson Apr. 7, 1942 Worthington Feb. 20, 1945 Black et a1. Sept. 4, 1951