US2708575A - Web-feeding mechanism for platen printing press - Google Patents

Description

y 7, 1955 E. G. OLIPHANT 2,708,575

WEB-FEEDING MECHANISM FOR PLATEN PRINTING PRESS Filed Nov. 17, 1950 9 Shets-Sheet 1 FIG. .1

May 17, 1955 E. G. OLIPHANT 2,708,575

WEBFEEDING MECHANISM FOR PLATEN PRINTING PRESS Filed Nov. 17, 1950 9 Sheets-Sheet 2 A TTO ENE V.

May 17, 1955 E. G. OLIPHANT 8,

WEB-FEEDING MECHANISM FOR PLATEN PRINTING PRESS Filed Nov. 17, 1950 9 Sheets-Sheet 3 IN V EN TOR.

ATTORNEY.

9 Sheets-Sheet 4 Imv E. G. OLIPHANT MECHANISM FOR PLATEN PRINTING PRESS INVENTOR. [aw/1v 6, OL/P/MNT rro ENE v.

WEB-FEEDING May 17, 1955 Filed Nov. 17, 1950 y 7, 1955 E. G. OLIPHANT 2,708,575

WEB-FEEDING MECHANISM FOR PLATEN PRINTING PRESS Filed Nov. 17, 1950 9 SheetQ-Sheet 5 $1; I I m m N I g m *9 V Y "9 m I OL/PHA/Vr H TTOR/VE V.

May 17, 1955 E. e. OLIPHANT WEB-FEEDING MECHANISM FOR PL Filed NOV. 17, 1950 FIG. 5

ATEN PRINTING PRES 9 sheets-Sheet 6 l 4 f5. Wu. m 63 INVENTOR. \59 65 60 DW/A/ OL/PHflA/T y 7, 1955 E. s. OLIPHANT 2,708,575

WEB-FEEDING MECHANISM FOR PLATEN PRINTING PRESS Filed NOV. 17, 1950 9 Sheets-Sheet '7 INVENTOR. Emvnv 6. OL/PHA'NT HTTORNEV.

y 17, 1955 E. G. OLIPHANT 2,708,575

WEB-FEEDING MECHANISM FOR PLATEN PRINTING PRESS Filed Nov. 17, 1950 e sheets-sheet s FIE. 1E

, INVENTOR. Bow/1v G. OL/PHANT HTTORNEV.

May 17, 1955 E. G. OLIPHANT MECHANISM FOR PLATEN PRINTING PRESS WEB-FEEDING 9 Snets-Sheet 9 lllllllL JNVENTOR Filed Nov. 17, 1950 EDWIN 6 BY 2 A rToR/vEv WEB-FEEDING MECHANISM FOR PLATEN PRINTING PRESS Edwin G. Oliphant, Seattle, Wash. Application November'17, 1950, Serial No. 196,251

4 Claims. (Cl. 271-2.6)

This invention relates to paper-feeding apparatus, and particularly apparatus for feeding web stock through a platen-type printing press.

The general object of the invention is to devise a perfected machine for this purpose and one, more especially,

which will intermittently move successive sections of the web into and out of printing position below the reciprocally movable platen; which admits of being easily and quickly set to cause the successive feed actions to uniformly advance the paper any desired distance within the limits of a given range of adjustment; and which in each of a succession of over-printing runs of the press, insures exact registration between the reciprocally moving platen and the sections of the paper web which are to take a printing impression therefrom.

With the above and other more particular objects and advantages in view which will appear and be understood in the following description and claims, the invention consists in the novel construction and in the adaptation and combination of parts hereinafter described and claimed.

In the accompanying drawings:

Figure l is a side elevational view illustrating a machine produced in accordance with the preferred teachings of the present invention, shown attached to a conventional platen printing press.

Fig. 2 is a top plan view thereof.

Fig. 3 is a fragmentary side elevation drawn to an enlarged scale and viewed from the side opposite that of Fig. l with the platen press being deleted.

Fig. 4 is a fragmentary transverse vertical section drawn to an enlarged scale on line 44 of Fig. 3.

Fig. 5 is a fragmentary front elevation drawn to a scale somewhat smaller than the scale of Fig. 4 but larger than that of Fig. 3.

Fig. 6 is a fragmentary longitudinal vertical section on line 6-6 of Fig. 5.

Fig. 7 is an enlarged fragmentary transverse vertical section on line 77 of Fig. 1.

Fig. 8 is a fragmentary longitudinal vertical section on line 8-8 of Fig. 7.

Fig. 9 is an enlarged fragmentary longitudinal vertical section on line 99 of Fig. 1.

Fig. 10 is a fragmentary longitudinal vertical section drawn to an enlarged scale on line 1010 of Fig. 2 to detail a paper-drying device which is incorporated in the machine.

Fig. 11 is a fragmentary perspective view detailing a feature, looking to ease of assembly, engineered into said dryer.

Fig. 12 is a longitudinal vertical section on line 1'212 of Fig. 7.

Fig. 13 is a fragmentary longitudinal vertical section drawn to an enlarged scale on line 1313 of Fig. 2.

Fig. 14 is a somewhat schematic perspective view illustrating the working of an electric eye which augments the primary feed to serve a corrective function in the feeding of the paper web.

States Patent 0 Fig. 15 is an enlarged fragmentary side elevational view showing a perfected means for holding the supply roll of paper, modified from the more conventional type of reel which I have portrayed in Fig. 1.

Fig. 16 is a fragmentary plan view of a rear end portion of said roll-carrying means.

Fig. 17 is a fragmentary transverse vertical sectional view drawn to an enlarged scale on line 1717 of Fig. 15.

Fig. 18 is a fragmentary transverse vertical section on 0 line 18-18 of Fig. 15; and

Fig. 19 is an enlarged fragmentary view detailing a part of the journal structure shown in Fig. 18.

In said drawings the numeral 20 designates the framework of a standard platen printing press having the usual type-carrying beam 21 pivoted, as at 22, for reciprocal swinging movement toward and from a stationary bedplate 23, the arrangement being one in which the paper to be printed is interruptedly drawn from a roll 24 and passes over the face of the bed-plate, so as to periodically come to rest upon the latter momentarily in advanceof the timed cyclic movement of the type into pressing engagement therewith. The type-carrying beam also carries suitable inking mechanism usually consisting of ink-transfer rollers 25 movably mounted so as to ink the type from an impregnated plate 26 serving as a source of supply. To give reciprocatory swing movement to the beam and coincidently provide necessary movement for the inking rollers it is customary to employ companion pitman arms 27 driven by crank pins 28 off driven wheels, and with one of these wheels, designated by 30, being a gear wheel turned by an intermeshing pinion 31 keyed or otherwise made fast to a drive shaft 32 which commonly carries a fly-wheel 33 and is belt-driven by an electric motor (not shown). With this type of printing press, the reel or spool from which the paper is drawn commonly turns about or with a spindle 34 supported in the manner shown in Figs. 1 and 2, and namely in open journals of a spool-carrier 3.5 surmounting the framework 20. The web of paper being fed to the bed-plate is passed from this roll first under an idler 36 and thence over an idler 37. In interruptedly drawing paper from a roll to feed successive sections of the web into printing position upon the bed-plate, there is an objection to the use of a freeturning roll, and that is the tendency of the roll, by reason of inertia, to continue to unwind during periods when the feed mechanism is inactive, and namely when the paper web has. been localized for printing. One feature of the present invention, while of secondary importance to my feed structure proper, is the provision of a perfected mount for the paper roll, out with this exception the parts hereinbefore described are well known in the printing art and are or may be of usual or suitable construction.

Referring now to my feed mechanism, there is provided a rigid frame sustained upon corner posts 40 and comprised of side plates 41 and 42 connected at spaced intervals of the length by cross-bars 43. This frame is so located as to have its longitudinal median line coincide with that of the press, but a feature of considerable importance is that the two frames, that of the feed mechanism and that of the press, are entirely unattached, hence requiring no special fittings in order to adapt the ,feed mechanism to use with practically any type of platen printing press, the only connection between the press and the feed mechanism being a drive transfer correlating the operation of the feed mechanism the press.

Located adjacent the rear end of the feed frameand receiving a journal mounting in bearings carried by the,

side plates, there is provided a transverse power shaft 44 projecting by its ends beyond the sides of the frame,

- and fast to one of these projecting ends is a sprocket with the operation of wheel 45 continuously driven by a chain 46 off a sprocket wheel 47 fast to the drive shaft 32 of the press. A cam wheel 48 is also carried upon this same end of the shaft, and for a paper-cutting purpose which will be later described operates through a bell-crank 48 to reciprocally operate a flexible cable 50, the bell-crank being fulcrumed, as at 51, to the side plate 42. Fixed upon the other end of this power shaft 44 there is provided a crank wheel 52 having in its outer face a diametrically extending slot 53 of T-shaped plan configuration, and received for endwise sliding movement within this slot is a nut 54 from which projects a crank-pin 55. A jack-screw 56 works in the threads of the nut and is held against endwise movement by a fitting 57 bolted to the crank wheel. It will be apparent that rotation of the jackscrew imparts radial shifting movement to the nut and hence governs the throw of the attached crank-pin 55. This adjustable crank-pin connects with a rod 49'and through a rack-and-pinion connection S59 imparts reciprocal rocker movement to two disks journaled for swivel action upon a frame-carried jack-spindle 63 and functioning as the driving complements of a friction clutch. Detailed in Fig. 9, one of said driving disks, designated by 61, is made integral with the pinion 58. The other disk 62 is urged directively toward disk 61 by the yielding force of a spring 60, and frictionally caught between said disks and serving as the driven element of the clutch is a sprocket wheel 64. A nut 65 threaded upon a hub prolongation 66 of the clutch element 61 permits adjustment of the spring load.

A transfer chain 67 carries the reciprocal rocker movement of the sprocket wheel 64 rearwardly to the sprocket teeth of a ring 68 which fits over and is secured, as by pins 70, to the driving element 71 of a unidirectional clutch such, for example, as a Hilliard clutch. The driven element 72 of such clutch is contained within the driving element, and-presents to the inner side an axial neck prolongation 73 which takes a journal mounting in the side plate 41 of the feed frame. A brake wheel 74 surrounds this neck prolongation between the frame and the clutch proper and is suitably secured, as by a pin or pins 75, to the inner or driven clutch element 72. A brake strap 76 carrying a friction shoe 77 is provided for this brake wheel and is of the self-wrapping character having its two ends connected with the arms of a weighted lever 79 fulcrumed, as at 78, to the side plate 41. As will be seen from an inspection of Figs. 1 and 8, the brake permits the driven element 72 of the Hilliard clutch to turn with the driving element 71 only in a clockwise direction, acting to grab said driven element as the driving element moves with the chain 67 through the return run of the latters reciprocal cycle.

The paper-feeding drum for the machine occupies a position between the side plates of the frame co-axial to the Hilliard clutch and is fabricated from annular headers 80 and 81 surrounded by a cylindrical shell 82, with one of these headers being connected, as by pins 83, to the driven element of the Hilliard clutch and the other header being pinned to a bushing 84 which is journaled for rotation in the frame-plate 42.

As an overhead complement to the paper-feeding roll there is provided a pressure roll 85 carried by a shaft 86 whose two ends are each journaled for free rotation in saddle openings of a respective keeper 87, these keepers being each pivotally mounted in pillow bearings 88. Springs 89, adjustable for tension, bear upon the free ends of the keepers to yieldingly hold the pressure roll against the paper-feeding roll. Laterally removed beyond each end of the pressure roll and carried for sliding adjustment upon the shaft 86 there is also provided a respective circumferentially grooved collar 91, and the function of these collars is to adjustably position two rings 92 which fit loosely upon the paper-feeding roll and act as side-edge guides for the paper being fed.

Said bushing 84, the headers 80 and 81, and the driven member of the Hilliard clutch are each center-bored, and extending through these registering center-bores is a shaft 93 having each of its two ends exposed. Upon that end of the shaft which projects beyond said side plate 42 there is keyed a worm wheel 94, and upon the other end, and namely that end which projects beyond the Hilliard clutch, there is keyed a dentated wheel 95 which I will hereinafter term a stop-wheel. Within the circumference of this stop-wheel there is provided a re-entrant notch, and fixedly socketed in such notch is a radially projecting lug 96. A threaded hole is tapped in the lug and a screw 97 is received for vernier adjustment in this hole, the screw being exposed beyond the front face of the lug. The screw acts as one of two limit-stops for a pin 98 which overhangs the rim of said wheel, said pin projecting laterally from a radially projecting ear 99 made integral with the driving clutch element 71. The other limit-stop is comprised of a block 100 movable bodily into selected adjusted positions within the circumference of the wheel. In the construction shown, this block fits closely within the throat of a yoke 101 straddling the stop-wheel and swingable about the center of shaft 93 as an axis, and presents upon its inner face a series of transversely-cut teeth which find a mating interfit with teeth 102 out in the perimeter of the wheel, the parts being firmly anchored by a thrust-screw 103 threading in the cross-arm of the yoke. In order to release the block for moving the same from one to another circumferentially adjusted position it is only necessary to back off the screw, whereupon the yoke can be swung free of the block in that the back wall of the block and the inner wall of the yokes cross-arm are each formed as arcs of a circle taken about the swing axis of the yoke.

Clarity in an understanding of the invention will perhaps be advanced by here tracing the operation of the parts which have been so far described. Let it be assumed, for the present purposes, that the stop-wheel 95 is a stationary wheel. The operator, having ascertained the de sired distance which he wishes to feed the paper in each of a succession of repeating feed movements, locates the two limit-stops in correspondence therewith, first obtaining a broad setting by bodily moving the block 100 and obtaining a fine setting by adjusting the Vernier screw 97. The operator then adjusts the throw of the crank pin 55, setting the latter so as to transmit to the pinion 58 a degree of arcuate travel somewhat in excess of that which, by'motion carried through chain 67, will move the pin between the two limit-stops. These settings, and namely the setting of the limit-stops and the setting of the crank-pin, are easily arrived at by providing suitable graduated markings (not shown) for the concerned parts. Disregarding for the moment the course taken by the paper after passing over the bed-plate 23, and assuming only that its leading end is caught between the feed drum 82 and its pressure roll 85, it will be apparent that the crank pin 55 takes its drive by chain 46 off the continuously driven power shaft of the press and is caused to rotate one complete revolution for each revolution of the gear wheel 30. In each such revolution the connecting rod 49 acts upon the pinion 59 to move the latter through a complete cycle of reciprocation, and the pinion acts through its associated friction clutch to reciprocally drive the transfer chain and responsively turn the driving member 71 of the Hilliard clutch. In the clockwise motion of this driving clutch element, the same couples itself to the driven clutch element 72 and the two then turn in concert and carry to the feed roll a like clockwise movement which acts to draw the paper'fon wardly. The clockwise turning motion of the driving clutch element will perforce be arrested when its projecting pin 98 strikes the limit-stop 100. The slippage provided in the primary friction clutch allows the driving element 71 to be arrested and still permit the pinion 59 to turn,

through a somewhat greater are of clockwise movement, As the crank pin 55 passes dead-center the motion of the pinion 59 is reversed and the driving element of the Hilliard clutch is then caused to responsively turn in counter-clockwise motion. During this return motion the brake 76 grabs the driven element of the Hilliard clutch to hold the latter stationary. The driving element of the Hilliard clutch moves in said return travel until it is arrested by contact with the limit-stop 97, and here again slippage within the primary clutch permits the pinion 59 to partake of an over-riding travel. The printing action of the platen is timed to occur as the crank-pin works toward dead center at the rear extreme of its rotary travel, during which time the paper is perforce stationary. The structure which has been described is self-sufiicient to accomplish an accurate feed if it can be assumed that paper being printed will be subject to substantially the same degree of stretch in each of a succession of printing runs. However, by reason of changing temperatures and humidities and other variable factors this is seldom the case and in compensation of these variables I have engineered a corrective device into the machine. This device comprises a photo-electric device which is or may be of the usual type providing a light source 105 and a photo-tube 196 so related one to another and to the paper being fed as to energize the tube by cast light refiected off the paper. The photo-electric device is contained in an electric circuit controlled by a switch 107 and includes a relay 108 (Fig. 14) leading to a repeating solenoid 110, the solenoid acting through ratcheting means such as the indicated Hilliard clutch 111 to impart rotary movement to a shaft 112 on which is carried a worm 113 meshing the worm-wheel 94.

The movement given is such as to turn the wormwheel, and perforce the stop-wheel 95 which is directly connected therewith, in a clockwise direction. Switch 107 is caused to be operated in timed concert with the operation of the paper feed, and particularly in a manner which completes a circuit to the photo-electric device simultaneously with or momentarily after contact of the pin 98 with the limit-stop breaking the circuit upon or shortly following the initiation of the pins return or counter-clockwise motion. By this token the circuit could, if desired, be engineered so as to employ the pin 98 as a means of making and breaking the same but this introduces objections from the standpoint of sparking and I prefer to employ a star-wheel snapswitch in which the spokes 115 of the wheel are activated in quarter-turn motions by pins 116 and 117 protruding from the inner face of the crank-wheel 52. In this arrangement the circuit is closed by the pin 116 and opened by the pin 117.

In order that the photo-electric device will perform its intended function, it is only necessary that the opera-- tor impress upon the paper, in the first printing run, some form of gauge mark which will absorb light rays cast from the light source. pose will in many cases be inherently contained in the make-up of the first printing but can, if necessary, be added thereto. Designated by 118, I have shown in Fig. 14 such a series of augmenting gauge marks, deleting for simplicity the accompanying first run of printed matter which necessarily would have been impressed upon the paper web coincident with the impression of these gauge marks. During this first printing run the photoelectric device is inactivated by opening a master switch 120, thus depending entirely upon the normal action of the main Hilliard clutch to interruptedly advance the paper web. For the following over-printing ditferent color run) the operator desirably cuts in the photo-electric device although, as before stated, he can obtain a fair approach to registering accuracy without using this control. The significance of the photo-electric eye is that it compensates for any stretch variations taking place within the length of the web, a factor which must be considered if exact registering accuracy is to be obtained.

Marks which will serve the pur- 53 In the present machine, the function performed by the electric eye is to inch the stop-wheel forwardly and responsively permit the pin 98 to creep in a corresponding degree during that momentary period of time in the cyclic movement of the primary friction clutch when clockwise slippage is taking place.

While not detailed in the drawing said photo-electric device should desirably admit of being adjusted both transversely and longitudinally as respects the major axis of the paper web in that the operator would be otherwise precluded from using, as a gauge mark, impressed markings inherently contained in various set-ups of type. With a machine which admits of moving the paper in each feeding cycle any desired distance up to a maximum of 22 /2 inches, and this is the range of feed adjustment which I have engineered into the machine presently being produced, it becomes necessary only that the photoelectric device be longitudinally shiftable one-half this distance. The degree of transverse shift should correspond to the width of the paper web. It might appear from an inspection of Fig. 1 that the limited space available between the two guide rolls 36 and 37 would preclude the device from being adjusted longitudinally in the maximum degree desired, and with some types of presses this situation does exist. It becomes desirable,

shown in Figs. 15 through 19, inclusive, and it will be apparent from an inspection of these views that the matter of space limitations is then no longer a problem. However, should an operator wish to retain his existing paper mount the photo-electric device can then be satisfactorily mounted upon the feed frame although it is desirable to position the same in close proximity to the bed-plate of the press.

It will be noted that I have provided a separate manually-operated control knob 1121 connecting through miter gears 122l23 with the worm-shaft 112. Making compensation for error through use of this manual control, and which is utilized only when the electric eye is inactive, is of course resorted to only when the minute error of feed taking place during each of a succession of printing cycles has become so magnified through compounding as to become visible to the naked eye.

It is a feature of not inconsiderable importance in the present machine to provide a means for drying the inked surface of the paper, and this serves two distinct ends. One is the self-evident purpose of protecting the printed matter against any tendency to smear as it is drawn under the pressure roll, and the other is to minimize stretching and particularly give to the paper, before reaching the ch the same condition of dryness which obfeed roll, mu tains as it comes off the supply roll. My dryer is' comprised of an endless belt 124 coated with sand, emery or other like grit body and passing about free-turning rollers 125 and 126. Dead axles carry these rollers and are themselves supported by the side bars of a frame structure 127 extending rearwardly from the feed frame and connected for vertical swinging adjustment to the latter. The rollers are removably mounted in the frame, the ar- The or outermost axle 130 are straight slots whereas the slots bear against frame-carried lugs 134 for holding the axles in place and establishing adesired degree of tautnessof the belt is significant inin the belt. The sand coating its ability to store heat concentrated upon the upper run of the belt by a heat lamp 135, the paper web working from the bed-plate 23 along the lower run of the belt 129 for the frontaxle are brought toand thence passing diagonally upwardly to a roller 136 from whence it extends forwardly to the feed drum.

The paper-cutting device which I have incorporated in the machine occupies a position to the front of the feed drum. The device admits of being activated or inactivated at will and is of course made to operate upon the paper following the last of a succession of printing runs. Such cutting device can of Figs. 3, 5, and 6, and provides a cutting knife 137 supported upon a carriage 138 for vertical reciprocatory movement into and out of a position whereat the edge of the knife establishes a paper-shearing action across the edge of a complementing stationary blade 140. A rockshaft 141 connects by rocker-arms 142 with the knife and upon a projecting end carries a lever 143 which connects with the flexible cable 49, the cable acting to move the knife in its operating down-stroke of reciprocation against the yielding force of a return spring 144. The cam is timed to operate upon the knife when the feed drum is inactive. manually shiftable into longitudinally adjusted positions by means of endless chains 146 one of whose supporting sprocket wheels, as 147, is controlled from a hand-knob 148 by intermeshed gears 1S0151.

In performing over-printing runs of the press it will be understood that the paper, as it feeds out from the feed drum in successive said runs, is wound upon a receiving reel (not shown), and it is the usual practice to then rewind the paper upon the supply reel before commencing the next run, although the re-winding step can be eliminated by reversing the type upon the platen.

In Figs. 15 through 19, inclusive, 1 have illustrated an advanced method of feeding the roll of paper from the supply reel to the bed-plate of the press. A factor to be considered in connection with ing of paper from a roll is the force of inertia upon the roll, causing the latter to more or less continually unwind and present slack paper between the roll and the platen. In. an effort to counter this condition it has been common practice to frictionally retard the rotation of the reel but this places an unnecessary load upon the feed mechanism. My perfected arrangement is designed to replace the more conventional structure shown in Fig. l and provides a framework presenting, at each side, a standard 153 and a rearwardly projecting bar 154, and cut in each said bar is a longitudinal slot 155 slidably accommodating a traveller 156. A tie-rod 157 presenting a laterally projecting end 158 extends transversely from one to the other said traveller, and journaled upon this rod for free rotation between the side-bars 154 is a roller 160. To yieldingly urge the rollers in a rearward direction, a cable 161 is tied to each traveller and extends rearwardly therefrom to take one or more wraps about a respective one of two grooved wheels 162 tensioned by a torsion spring 163.

The roll of paper is caught between cone-shaped clamping collars 164 fixed by set-screws 16S upon a spindle 166. One end of this spindle fits in an open journal 167 provided by one of the two standards 153. Journaled in the other standard for rotation about a coinciding axis is a block 170 having a squared center-bore, and a squared tip 171 presented by the spindle fits in a portion of this bore. A brake-wheel 172 also finds a journal mounting in the last-named standard and similarly presents a squared center-bore to admit of being coupled to the block by means such as the indicated key-slug 173. A locking screw 174 passes through a center-bore of the key-slug and takes a thread purchase in the spindle. The brake wheel is complemented by a brake-strap 175 having one end anchored, as at 176, to the related standard and connecting by its other end to the short arm 177 of a brake-setting lever, this lever being fulcrumed, as at 178, to the standard and locating its long arm 179 in an interruptive position in the spring-urged travel path of said projecting end 158 of the traveller-rod 157. In the be best seen from an inspection The carriage works in slide-ways 145 and is the intermittent feednormal operation of the paper-feed mechanism, the roller 160 partakes of a more or less continual reciprocal movement, taking up and paying out that which would normally be slack paper. Should the inertia of the supply 0 spool cause the paper to run off the spool in excess of the compensating travel of the roller 160, the resulting unrestrained rearward travel of the roller brings pin 158 against the levers long arm 179 and responsively sets the brake, the spool being then arrested until the roller 160 is again drawn forwardly against the comparatively minor restraint of the torsion spring 163.

Although I have here illustrated and described in detail the now preferred embodiment of the invention, it is evident that changes can be resorted to without departing from the spirit of the invention and I accordingly intend that no limitations be implied and that the hereto annexed claims be given a scope fully commensurate with the broadest interpretation to which the employed language admits.

What I claim is:

l. The combination of a member admitting to movement along a given travel path, a stop normally occupying a localized position within said travel path and performing an interrupting function upon said member, drive means frictionally engaging the member to move the latter at a comparatively rapid rate of speed along said travel path and admitting to an overriding slippage when progress of the member is interrupted by contact With the stop, and means imparting to the stop a slowspeed advance motion and made to operate upon the stop after said contact is made so as to then inch the stop forwardly and thus allow the member to creep with the stop at a comparatively low rate of speed.

2. In a web-feeding mechanism, a normally stationary stop-wheel, a web-feeding drum and a driving wheel both of which are journaled for turning motion about an axis coinciding with the center of the stop-wheel, a unidirectional clutch establishing a driving connection from the driving wheel to the drum, a pair of stops car- 10 ried by the stop-wheel with one of said stops being fixed and the other circumferentially adjustable within the perimeter of the wheel, means carried by the driving wheel and by oppositely directed turning movements of the latter brought into engagement with the stops to prescribe end limits of the power wheels permissible motion relative to the stop-wheel, power-driven means acting to reciprocally move said power wheel within said prescribed limits while being itself permitted to partake of an overriding travel, the setting of such stops being such that the turning motion transferred by the unidirectional clutch to the drum as the driving wheel moves between said stops advances the web through a major degree of travel less than a predetermined required distance, and governed means made functional upon said stop-wheel as a follow-up to the recited web'fceding action for imparting a slight turning movement to the stop-wheel and by such movement responsively allowing the driving wheel to creep forwardly in the minor degree necessary to further advance the web the remaining distance of its required travel.

3. In a web-feeding mechanism, a normally stationary stop-wheel, a web-feeding drum and a driving wheel both of which are journaled for turning motion about an axis coinciding with the center of the stop-wheel, a unidirectional clutch establishing a driving connection from the driving wheel to the drum, a pair of stops carried by the stop-wheel with one of said stops being fixed and the other circumferentially adjustable within the perimeter of the wheel, means carried by the driving wheel and by oppositely directed turning movements of the latter brought into engagement with the stops to prescribe end limits of the power wheels permissible motion relative to the stop-wheel, power-driven means acting to reciprocally move said power wheel within said prescribed limits while being itself permitted to partake of an overriding travel, the setting of such stops being such that the turning motion transferred by the unidirectional clutch to the drum as the driving wheel moves between said stops advances the web through a major degree of travel less than a predetermined required distance, and means governed by equidistantly spaced markings occurring upon the Web which is being fed and made functional upon said stop-wheel as a follow-up to the recited web-feeding action for imparting a slight turning movement to the stop-Wheel and by such movement responsively allowing the driving wheel to creep forwardly in the minor degree necessary to further advance the web the remaining distance of its required travel.

4. In Web-feeding mechanism, a normally stationary shaft, a web-feeding drum and a driving wheel both of which are traversed by the shaft and journaled for turning motion about the center of the shaft as an axis, a clutch establishing a driving connection from the driving Wheel to the drum in one direction only of the driving wheels turning movement, a stop-wheel positioned side the driving wheel and fixed to an end of the shaft, a pair of stops carried by the stop-Wheel with one of said stops being fixed and the other circumferentially adjustable within the perimeter of the Wheel, means carried by the driving wheel and by oppositely directed turning movements of the latter brought into engagement with the stops to prescribe end limits of the power wheel's permissible motion relative to the stop-wheel, powerdriven means acting to reciprocally move said power wheel within said prescribed limits While being itself permitted to partake of an overriding travel, the setting of such stops being such that the turning motion transferred by the unidirectional clutch to the drum as the driving wheel moves between said stops advances the web through a major degree of travel less than a predetermined required distance, and governed means connecting with the end of the shaft opposite to said stopwheel to operate as a follow-up to the major advance of the Web and acting through said shaft to impart a slight turning movement to the stop-Wheel and by such movement responsively allowing the driving wheel to creep forwardly in the minor degree necessary to further advance the web the remaining distance of its required travel.

References Cited in the file of this patent UNITED STATES PATENTS 1,526,209 Grupe Feb. 10, 1925 1,723,878 Molins Aug. 6, 1929 1,783,942 Jacobucci Dec. 2, 1930 1,825,821 Rosenthal Oct. 6, 1931 1,839,397 Kunedt Jan. 5, 1932 1,929,087 Wood Oct. 3, 1933 2,006,628 Cline July 2, 1935 2,033,857 Smith et a1. Mar. 10, 1936 2,035,201 Smith et a1. Mar. 24, 1936 2,095,125 Cornock Oct. 5, 1937 2,152,770 Often Apr. 4, 1939 2,188,871 Broekhuysen Jan. 30, 1940 2,199,708 Maxfield May 7, 1940 2,203,087 Hanson June 4, 1940 2,268,987 Hess et al. Jan. 6, 1942 2,338,596 Pitt et al. Jan. 4, 1944

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