US1855503A - Roll changer for printing presses - Google Patents

Description

April'26, l932.v B. c. WHITE 1,855,503

Rom. CHANGER Eon PRINTING PRESSES Filed June 20, 1923 l 14 Sheets-Sheet 1 e7-4' -JNVENTOR April k1932. B. c. WHITE ROLL CHANGER FOR PRINTING PRESSES Filed June 20. 1923 Sheets-Sheet 2 A NVENTOR 2% 9%/ Q u M /5' ATTORNEYS Aprilzs, 1932. B, C, WHWE -1,855,503

ROLL CHANGER FOR PRINTING PRESSES I.

Filed June 2o,A 192s 14 sheets-sheet s /NVENTO B y @ma April 26, 1932 B. c. wHlTE ROLL CHANGER FOR PRINTING Pmjssrs` Filed June 2o, 192s 14 sheets-sheet 4 INVENTOR i //S A TTORNEY April 26, 1932. B, C W|||TE A 1,855,503V

ROLL QHANGER FOR PRINTING PRESSES Filed June 20, 1923 14 Sheets-Sheet 45 INVENTOR April 26, 1932. B. c. WHITE ROLL CHANGER FOR PRINTING PRESSES Filed June 20, 1923 .14 Sheets-Sheet 6 April 26, 1932. B C, WHlTE ROLL CHANGER FOR PRINTING PRESSES Filed June 2o. 192s 14 sheets-sheet 7 /N VENTOR m /f/s A TTORNE YS April 26, 1932. B. c. WHITE ROLL CHANGER FOR PRINTING PRESSES Filed June 20, 192s 14 sheets-Sheet 8 April 26, 1932. B. c. WHITE l ROLL CHANGER FOR PRINTING PRESSES 14 Sheets-Sheet 9 Filed June 20, 1923 /NVENTO By @ma @Offb/L @L mfg/grown Ys April 26, 1932. B. C, W|||TE 1,855,503

ROLL-CHANGER FOR PRINTING PRESSES Filed June 20, 1923 n 14 Sheets-sheet V1o INVENTOR //S ATTORNEY April 2s, 1932.

B. c. WHITE ROLL CHANGER FOR PRINTING PRESSES Filed June`20, 1923 14 Sheets-Sheet l1 /N VEN TO/e B. c. WHIT'E April 26, 1932.

ROLL CHANGER FOR PRINTING PRESSES,

Filed June 20, 1923 14 Sheets-Sheet l2 I I/Q April 26,'193'2. B. c. wH|TE' I 1,855,503

ROLL QHANGER FOR PRINTING PRESSES Filed June, 2o, 1923 14 sheets-sheet 15 v n I y wwmwwwwwwwwwim [N VENTOR @ma @am l//S ATTORNE .April 26, 1932. B. c. WHITE ROLL CHANGER FOR PRINTING PRESSES Filed June 20, `1923 14 Sheets-Sheet 14 fi l.

l Patented Apr. 26, 1932 UNITED STATES PATE-Nr OFFICE :muon c. WHITE, oF NEW YORK, N. Y., AssIGNoR., BY MESNE ASSIGNMENTS, To 12. non v AND co., INC., oF NEW YORK, N. Y., A conPoRA'rroN oF NEW Yonx BOLL CHANGER. FOR PRINTING PRESSES Y Application lel . Tune 20, 1923. Serial No. 646,592.

This invent-ion rela-tes to that class of printing presses wherein the paper to be printed is in the form of webs drawn from rolls through the machine.

The principal objects of the invention are to facilitate Vthe supply of the rolls of paper and to insure the Webs of successive rolls' automatically assuming such connected relation that the paper from-a plurality of succeeding rolls will be fed to the printing machine in a continuous `webw1thout necessarily involving the interruption of the printing operation.

Another 'object of my invention is to provide improved means for speeding up and controlling the speed of the fresh rolls, and the speed and stoppage of the expiring rolls independently.

Another object of my invention is to provide a simple, semi-automatic control for the paster and web severing devices.

' Another object of my invention is to provide an automatic means for marking the particular folded papers or units of the product which contain the pasted or doubled portion of any web which goes to make up the product. j y

Other objects of my invention are to pro'- vide roll-changer mechanisms which can be fitted to a printing press in place of the usual` Fig. 2 is aside-elevation ofx the operating o'r front side of the rollchanger.

Fig. 3 is a side elevation of the driving or rear side of the roll-changer. l Fig. 41's a horizontal section on line 4--4 of Fig. 1.

` Fig. 5 is a horizontal-section on line 5- -5 of 5 Fig. 1.

Fig. 6 is a detail on a larger scale than that of the preceding figures of the traction belts. FFig. 7 is a section of same on line 7-7 of Fig. 8 is an enlarged section of the drivingshaft, pulley and journal bearing of the trac-A A tion device. f

Figs. 9 and 10 are details of the outer traction belt, pulleys and journal bearings.

Fig. 11 is a detail section of the control cylinderl for the speed up traction belt on line 1.1-11 of Fig. 121

Fig 12 is a side elevation partly in sectlonA along line 12-12 of Fig. 11, showing the same parts as in Fig. 11.

Fig. 13 is a section on line 13-13 of Fig. 15 showing the reversible roll holder drive.`

Fig. 14 is a verticalsection on line 14-14 of Fig. l5.

^ Fig. 15 is a horizontal section on line 15-15 of Fig.. 13. Y

Fig. A16 is a-detail section on line 16-16 of Fig. 17, showing the clutch control eccentrics. Fig. 17 is a side elevation of the clutch control levers, which with the preceding four -figures relate to the traction belt and roll holder drives. y

Fig. 18 is a horizontal section on line 18- 18 of Fig. 19 showing one of the roll holders. Fig. 19 is a vertical section on line 19-19of Fig. 20 is a plan viewvpartlyl in section onv linie 18-18 of Fig. 19 and showing a half width roll of paper with its spindle.

Fig. 21 is a detail section of the roll holder online 21-21 of Fig. 22.-

Fig. 22 is a section of same on line 22-22 of Fig. 21. I

' Fig. 23 is a section of Fig. 24.

of same on line 23-23 Fig. 24 is a section of same on line 24L-24l A of Fig. 23.

Fig. 25 isa plan view of a full width paper roll showing the normal position of the traction belts and pasted area of the fresh roll.-

Fig. 26 shows the position of a half width .roll of paper and its spindle and pasted area when at one side of the center.

Fig. 27 shows the position of ahalf width roll of paper whenl centrally located, with a suitable spindle and pasted area.

Fig. 28 is a'plan view partly in section on line 28-28 of Fig. 30 showing the paster and severing knife mechanism.

Fig. 29. is a fragmentary plan View of the marker for indicating the position of the pasted papers in the product.

Fig. 30 is a vertical section of paster and its operating mechanism on line 30-30 of Fig. 28.

Fig. 31 is a vertical section through the paster operating cylinder on line '31-31 o'f Fig. 28.

Fig. 32 is a detail section on line 30-30 of Fig. 28, showing the marker about to be moved into Contact with the paper and in line 36-36 of Fig. 34.V i

Fig. 37 is a horizontal section showing in detail the frictional cut-od coupling of the. traction belt drive and brake and is 'takenalong line 37-37 of Fig. 38.

Fig. 38 is a detail of the clutch lever shown partly in section along line 38-38 of Fig. 37. Fig. 39 is a detail view of a hoisting plug being a section on line 39-39 of Fig. 40 and 'y as used witha roll center tube.

Fig. 40 is an end view of same.

Fig. 41 is a section of same on line 39-39 showing the hoisting plug used in connection with a roll spindle.

1Fig. 42 shows the plugs in use on a half ro l.

Fig. 43 is a diagrammatic partly sectional side elevation of the invention as vused with a printing press.

. Similar numbers indicate like parts in all the figures.

In the embodiment of the inventions disclosed herein A indicates a lower roll chang er, B a middle roll changer and C `a top roll changer approximately as arranged. at the end of a three-web or sextuple printing press.

1 indicates a base plate to which are bolted the upright front frame 2, and the upright rear frame 3, also the lower roll support 4.

The frames are tied together by means of the outer cross ties 5, the middle cross ties 6 and the inner cross ties 7. To the outer cross ties 5 are bolted extension brackets 8 for supporting temporarily the fresh paper rolls 9 which may be replaced thereon with the aid of a paper roll hoist of the usual type but not lshown. Likewiser a fresh roll 10 may be lplaced upon the support 4.

. tate in the reelsby Considering now the lower-or A deck, a fresh roll 11 has already been rolled inward suliiciently to be secured in the rollholder 12, this roll holder being shown in the form of a pair of spaced heads. n

Paper is generally Wound upon an iron pipe or core tube 13, see dotted lines in Figs. 4, 20 and 22. To support and center afresh roll of paper in the roll holders 12 having first properly positioned it, the taper plugs 14 are forced into both ends of the core tube 13 by means of the screws 15 and hand-wheels 16 having their bearings in the plate 17 see Figs. 18y and 22. A. traveling nut 18 having screw threaded engagement with the screw l5 is secured fiXedly to thenut-plate 19. The latter is provided with projecting lugs which are free to slide longitudinally in the keyways 2O of the holes 21 bored through the heads on opposite sides thereof and near their periphery. Preferably antifriction ball bearings 22 and 23 are introduced to carry the weight and endwise thrust sustained by the taper plugs 14 which latter are free to rothe rotation of the paper rolls.

,The heads 12 are ournalled upon the nonrotating centers 24 and are held against endwise movement thereon by means of the flange 25 andk collar plate 26. The reel centers 24 are fitted to slide freely endwise in the hubs 27 projecting inward from the frames 2 and 3, but are prevented from rotating therein by the key plug 28, the latted inner end of which has sliding engagement in the keyway 29 of the center, thus leaving the latter free to lbe 'moved endwise in the frame hubs by means of the screw 30 to which is secured the hand wheel 31. e

A .sprocket wheel 32 is also secured to the screw 30 and 'has a sprocket chain 33 trained about it and also about a sprocket 34 on each end of aoshaft 35, see Fig. 4. By this means the operator in turning either ofthe hand wheels 31 will rotate both screws 30 in the same direction in a manner to screw both centers 24 and consequently both heads and the rolls of paper mounted therein either to the right or left, as may be desired, in order to properly introduce the web into the print,- tin elements ofpthe press. The screw 30 has its. caring in aplate 36.

The heads 12 are preferably adjusted to give only` suliicient space for the introduction of the paper rolls between them, which latter are of uniform size, hence may be readily positioned and centered. To facilitate the correct placing of the rolls small anti-friction rollers 37 are let into suitable recesses in the rollsupport4 and outer cross-ties 5 whereby the fresh roll may be moved easily to the right or left as required. These rollers 37 are utilized to remove the exhausted rolls laterally from the machine, as will be more fully explained.

The heads 12 are provided with heavy spur gears and are provided with external gearteeth which mesh into toothed pinions 38 keyed to the pinion shaft 39. To the latter is keyed a worm wheel 40. Bearings 41 upon the inner cross tie 7 support the shaft 39, which latter is further supported in a journal 42 in the gear box 43, see Fig. 4.

A vertical worm shaft 44 having a worm 45 formed thereon is journalled in bearings 46'and 47. The worm shaft 44 is provided with feathers 48 upon which the double leather faced cone 49 is free to slide vertically. A split collar 50 is clamped into a groove in j the said double cone in which it is fr'ee to.

turn. The split 'collar is held from rotation by the stud 51. The split collar is linked to an eccentric shaft 52," journalled in the cap 53 by links 54. The links engage projecting trumiions 55 on the split collar and eccentric projections 56 on the shaft 52. The latter is rotated by a curved arm 57 which in turn is connected by a link 5 8 to one `arm 59 of a bell crank 60. The latter. is journalled upon a stud 61 and its depending arm 62 is connected by a rod 63 to the operating or front side of the machine.

The arm 57 is notched for a spring 64, see

Fig. 14, which tends to hold said arm in any one of three positions, one representing the clutch cone forced upward, one representing it forced downward and one in a middle position.

Above and below the double cone clutch .35 are spurgears 65 and 66 having internal surfaces corresponding with the conical surfaces of the double cone clutch. Said gears are provided with collars 67 to prevent their endwise Amovement on the worm shaft upon which they are both free to turn.

68 is a vertical driving shaft to which is secured a pinion 69 which latter meshes into the lower cone gear 66 and also into an intermediate gear 70 upon the shaft 71. The gear 70 also meshes into the upper cone gear 65 whereby the lower cone gear 66 being driven' direct from the shaft 68 will rotate in one direction, while the upper cone gear 65 being driven through an intermediate gear 70 will rotate in the opposite direction. It follows that if the double cone 49 is thrust up'- ward to engage the gear 65 the worm will be rotated in one direction while if the double cone is forced downward -to engage gear 66 the worm will be rotated in the opposite direction. If the double clutch cone is retained in mid-position it will be out of contact with both gears and will not rotate but will hold the worm gear`40, and pinions 38 from rotation and hence lock the. heads 12 in any position desired. The gearing just described is preferably enclosed in the gear box 43.

The vertical driving shaft 68 is keyed into a bevel gear 72 which meshes with the bevel gear 73, keyed to the shaft 74 which is journalled in bearing 75. The shaft 74 is keyed into the spur gear 76 which in turn is driven by the spur gear 77 keyed to the way-shaft 78 of the printing press. Suitable bearings 79 are provided for the way-shaft. Bevel gears 80 mesh with and drive pinions 81 upon the shafts 82 one foreach deck. Chain sprockets 83 upon the shafts 82 drive through the pitch chains 84 the chain sprockets 85 secured to the shafts 86. Both the shafts 82 and the shafts 86 are preferably mounted in ball bearings. Both shafts terminate invone element ofthe friction cut-off couplin 87 and 88 which latter are driven in one irection at a speed corresponding with that of the web.

Extendingacross the machine from the cut-off couplings are two pulley shafts 89 and 90 foreach deck to which are secured the other friction elements of the cut-off couplings. When the friction elements of the said couplings are brought into contact by means of the clutch levers 91 and.. 92 the shafts 89 and 90 will partake of th'e rotation of the shafts 82 and 86 or either of them. Rods 93 and 94 extend from the clutch levers to the operating or front side ofthe machine.

Uponthe shafts 89 and 90 are fixedly secured pulleys 95 and 96. Swinging' frames 97 and 98 are .journalled in the rail pieces 99 and bracket 100 concentric with the journals of the sh afts 89 or 90, which latter journals are made preferably in the form of ball bearings. The swinging frames-97 and 98 carry pulleys lOland 102 which run freely upon their shafts 103 or 104, preferably with ball bearing journals thereon. Said shafts are mounted in adjustable end blocks 106 provided with adjusting screws 106', whereby tension of the belts 500 trained about the pulleys 95 to 101 and the belts 501 about the pulleys 96 to 102 may be adjusted.

The outer swinging frame 98 is connected by links 105 to arms 106" keyed to the shaft 107, see Fig. 7. The latter is journalled in the rail pieces 99 and also in the front frame 2 through which it projects and has keyed to ita segment gear 108; Meshing with the segment gear is a rack-bar 109 which forms, as it extends downward, the piston-rod o a double acting air cylinder 110. At the lower j end of this rod is secured a piston fitted to slide freely in said cylinder. The usual cylinder heads 111 and 112, with stuffing box 113, and air pipes 114 with a 4-way valve 115 complete this device, which is designed to raise and lower the pulley frame 98 to lift it bodily out of the path of ythe incoming fresh roll, or to lower the traction belt into contactwith said roll'to cause itto rotate and to follow its surface as it unwinds its web and reduces its diameter, also to follow it as itis moved upward and inward toward its expiring position, as shown in the relative position of the parts onzthe B deck, Fig. 1.

The inner clutch cut-off coupling 87,

which, drives the inner traction pulleys 95, is operated through the clutch rod 93 and clutch lever 91. The latter is provided with an arm 116, formed and adapted to bear against the outside surface of clutch 87, and to act thereon as a friction brake, to quickly stop the shaft 89 when the clutch is released, utilizing the clutch releasing movement of rod 93 to apply the brake 116 as shown in Figs. 37 and 38.

' The clutch rod 93 is operated by a handle 117, acting between collars 118 on said rod. The handle 117 may be moved by rthe operator to stop or start the inner traction belts. Additional and automatic means are provided for disconnecting the clutch coupling 87 and applying the brake thereto consisting in a downwardly extending cam-shaped part 119 of the handle 117, in the path of a roller 120, mounted in a forked bearing 121 secured to the inner face of a swinging arm 122, see Figs. 34, 35 and 36. These parts are so arranged that when the arm is in the position shown in full lines in Fig. 34, the handle may be moved in either' direction. When the arm 122 is lowered to the position shown in`dotted line in Fig. 34, the roller 120 will force the lower end of lever 117 inward, thus pulling the rod 93 outward to release the clutch and set the brake 116. The

lever 122 is keyed to the pastel shaft 123, which latter extends across the machine and is j ournalled in bearings 124 secured to crosstie 7. Keyed to the shaft 123 are arms 125 which latter have projecting lugs 126. These lugs are adapted to engage corresponding lugs 127 formed upon and projecting inwardly from the pasting arms 128.

Extending between the pasting arms is a pasting roller 129 preferably mounted to run up n ball-bearings upon the non-rotatingy .the contact of their ' lugs 126 and 127 they may be raised and lowered without affecting the relative position of the knife 133. Vlien the pastirig roller 130 is lowered to meet the fresh paper roll as in deck A Fig. 1 the arms 128 will stop; Any further rotationof the shaft 123 will continue to swing the arms 125 rearwardly and with them the rods 135 and arms 134, thus turning the square shaft 131, whose pivots are now stationary, in a manner to swing the knife 133 into and across the path of the web 137 and sever the same. The

-in dotted lines in Fig. 30 and as shown in deck B. Fig. 1 up out of the way of the paper roll.

It is not expected nor intended that the' paster roller shall apply the web from the eX- piring roll to the surface of the fresh roll with any reference to the angular position of the' pasted area upon the latter, as the rapid rotation of the fresh roll when making a paste at full speed'would make such timing impractical. Any automatic device for timing the pasting movement to the pasted area s likewise `complicated and unsatisfactory due to the high speed and variation in the diameter of the fresh rolls, I preferably make the pasting movement regardless of the position of the pasted place upon the fresh roll and delay the cutting off of the web from the expiring roll until the fresh-roll has made one revolution, thus insuring a proper paste. To accomplish this it is necessary to retard the swing of the knife into the web path which, as has been described, is effected by the final downward movement of the lever This lever 122 is actuated by a double actwith a valve 150, and another by-pass pipe with its valve 151, whereby the descent of the piston 148 to the level of the valve 151 may be relatively rapid, depending upon the opening of the valve 151, after which the descent may be as slow as desired, depending upon the opening of valve 150. This latter movement corresponds with that part of the turning of the shaft 123 after the ,roller 130 has met the paper roll and while the knife 133 is being swung `downward and into the path of the web, and is timed to correspond with one revolution of the paper roll. This vensures that the pasting will occur before the web from the expiring roll has been severed, regardless of the angular-position of the pasted place upon the fresh roll. The operator need only turn the 4-way valve 146 to effect the pasting or roll change, `when the succeeding movements will be effected in their proper sequence and with the proper intervals between them. When the pasting and web severing have been accomplished, the 4-way Valve 146 will be reversed and the piston will lil rise and with it the pasting roller and knife to the positions shown in decks B or C, there to remain out of the way until another fresh roll is to be connected to the running web,

when the operation is repeated. The descent of the lever 122 as -already described throws the friction clutch 87 out of engagement and applies the brake 116 thereto, to quickly stop the expiring roll from further unwinding lo after its web has been severed.

Heretofore when renewing rolls, the practice has been to stop the press. lWhile the press speed is being retarded to the stopping point, or is beingv accelerated from a standstill to full speed, the product is generally improperly folded and otherwise defective and is removed from the delivery belt and rejected. The number. of papers lost for each such stoppage or interruption of the printing 2o operation is considerable. To reduce this wastage, Ait is necessary not only to maintain printinof speed while renewing the'rolls on any dec but also to make some distinguishing mark upon the folded copies of the product which will identify them as containing the pasted or doubled web from one of the several rolls of paper from which the product is made. Such marked copies will preferably be marked upon the margin of the out-l side page, in chalk or marking pencil upon a few copies in advance of and following the pasted place, limiting the copies so marked to the smallest practical number.

To accomplish this result, I utilize the movement of the arms 125 by 'forming upon one of them a lug 152, provided with a catchplate 153, which latten is adapted to engage a hook-plate 154 secured to the sliding block 155 upon the rod 156. An upwardly yielding `s ring 157 acting against aY collar 158 upon t A, rod 156 permits the sliding block to .centinue its upward movement after the rod 1576 has reached the limit of its upward movement. The rod 156 is pivotally connected to a marking lever 159 fulcrumed upon apivotpin 160 and carrying a marking pencil or crayon 161. This crayon 161 is brought into Contact with the running web atabout the time that' the roller 130 meets the fresh roll, and will therefore begin to make a mark 165 on the web in advance of the pasted place and will continue to mark the -web until it is severed or later, depending upon the time when the catch-plate 153 unhooksA or releases the hookplate 154 in its upward movement. The main purpose of the marking of the web is to distinguish the copies containing the paste, rather than to c'ountoif any particular numo ator wi quickly learn how many copies to 5 justably secured to the arm 159 and preferber of cplpies following'the paste,l as the opering operation.

ably bears upon the web as it passes over an idle running carrier roller 163.

Obviously the marking of the web may be done `in ink or pigment, with a pen, brush or roller, or dripped or sprayed upon or otherwise marked, or theweb may be cut or torn or otherwise mutilated to render distinguishable the marked copies of the product as they advance upon the delivery.

The marking of the web may be done at any ,desired point in the printing operation between the pasting and delivery, or upon the delivery itselfand may be applied upon either side of any web and upon either margin thereof to make it distinguishable on the product.

The devices included in the pasting, sever- Ving and marking mechanisms and their pneumatic control are similarffor the three decks except that the marking lever and crayon are only applied to the web which will be at the outside of the folded product. There will be the same lugs 152, sliding blocks 155 and springs 157 for all decks, but the rods 164 and 165 will extend from the three different -90 `arms 125 to the common`lever-159 so that a pasting movement at any of the three decks will similarly mark the selected web. As the movements of the catch-plates are lifting actions only, against the lever 159 it follows 95 that there will be no interference between them even though the pasting should occurl simultaneously upon all three decks. In this device it is assumed that the lineal distance along each run of web from the paster roll to the point at which the various webs are associated is practically the same. Small differences may be disregarded, but differences greater than can be compensated for within the range of the various adjustments, would obviously require a duplication or triplica-` tion 4of the marker applied at different points to the selected web in order to properly locate the pasted places.

' The outside pages are always printed from full width rolls hence the marking device above described when once attached and connected need not be disturbed. Half width rolls are frequently used for printing what is termed a. dinkey sheet. The web from the latter is pasted and severed in the same manner as full width webs and would' therefore mark the place of. its pasting upon the outside or selected web.

The web running from the expiring roll 112 passes around the pasting roller 130 and I thence over the free running roller 166. The direction of these web-runs is `so arranged in relation to the arc or path of movement of the roller 130 that the web will be neither 125 stressed nor slackened by such roller movement in either direction, thereby avoiding" web breakage, or slip and failure of the past- The exhausted roll, after its web been 13o engagement the roll holder drive and turnsl the roll holder to the position shown in deck B, having v first started the tension belt drive through the clutch 87. The tension frame 98 may now be swung outward and upward to the position shown in C deck and stopped by throwing out the clutch 88.

'lln the position shown in B deck the ex# hausted roll llfhas been moved somewhat forward of its lowest position and the running roll is somewhat beyond its uppermost position. At this time the reel is stopped and the centering plugs 14 in the exhausted roll are withdrawn by backing the hand wheels 16. rlhe exhausted roll will now. fall out of place and upon the hinged rail sections 167, which are adjustably sustained by the eccentrics 168, which latter are keyed to the shaft 169, journalled in the rails 99 and are adjustable by a wrench from` the front at 170; By this arrangement the exhausted rolls may be of varying diameters, dependent upon the condition of the pape/1` near the center of the roll and the hinged section of the rails or track may be raised to meet the exhausted roll. The fall of the latter is avoided or softened and the outward inclination of the track starts the roll outward, see deck B, Fig. 1. The exhausted roll now rolls or is rolled outward upon the track 99 until it is upon the rollers 37, whose top surfaces form a continuation of tracks 99. f a

F rom this position the exhausted roll may be pushed to one side and out of the way of incoming rolls, suitable roller brackets being provided forthem at each deck level not shown or the exhausted rolls may be lowered 4 by the same hoisting device which originalon the drawings.

The hinged rail-sections also serve to act as stops to the incoming fresh roll. The latter having been deposited upon the bed extension 4 or the bracket 8 and the exhausted roll having been disposed of, the fresh roll is so placed and the heads are so adjusted in angular position that the taper plugs 14 may be forced into the central tube of the roll at both ends thereof. By causing the roll holder now to turn a short distance, the roll is lifted and is free to revolve. 4

The outer traction belt has already'been described as pocketed up out of the way of be. With the outside layer gone or damaged the pasting operation is generally rendered impossible.

When the traction belts are applied with considerable pressure to the rolls before the belts are started, it is found that by introducing a'suitable and sensitive friction clutch coupling into the traction-belt drive, the rolls may be started gently and with no damage to the outside layer of paper thereon and with gradual and uniform increase in/speed the inertia of the roll is overcome completely and the speed may be brought to correspond with the web speed. As there is no slipping of the belts upon the paper roll, it follows that the belts may be rubber or other material having a high coefcient o f friction and may be forced against the paper with high pressure and belt grease may be applied to the belts both inside and out to increase their friction;

Multiple disk clutches are used preferably as being more sensitive and gentler in starting than other types. This arrangement of belt drive also offers advantages in giving a surer control of the roll speed when the press is suddenly stopped or started, after the fresh roll has been speeded. up and the clutch is carrying its full load, as the fresh roll responds to every change in speed of the press and does not run ahead and unwind when the press stops, nor does it lag behind when the press starts, thereby tending to break the web. y

The friction clutch cou ling is introduced into the speed-up drive or safe and gentle starting and reliable speed-control of the `fresh roll. The friction clutch coupling is introduced into the drive of the traction belts of the expiring roll to continue this control and afford means for a quick stop of the latter after severing the web. This two-traction-belt arrangement gives the operator continuous control of the rolls from the time the fresh roll, first begins to revolve until it is cut ofi:` and stopped, which control he can not have with any single-traction-belt, as the latter can not act upon two paper rolls at the same time successfully.

25 shows a paper roll of the usual proportions for printing 4 pages in width. For such a width, two pairs of traction belts Afor both the speed-up and slow-down would be used instead of one, as shown in the other ilo

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