US1939717A

US1939717A - Paper feeding mechanism

Info

Publication number: US1939717A
Application number: US461289A
Authority: US
Inventors: Lawrence H Morse
Original assignee: MULTIGRAPH CO
Current assignee: MULTIGRAPH Co
Priority date: 1927-12-06
Filing date: 1930-06-16
Publication date: 1933-12-19
Anticipated expiration: 1950-12-19

Description

Dec. 19, 1933. 1 .'H MORSE 3 5 V PAPER FEEDING MECHANISI.

Original Filed Dec 6, 1927 *5 sheets-sheet 1 Dec. 19, 1933. I

Original Filed Dec. 6, 1927 H. MORSE PAPER FEEDING MECHANISM 5 Sheets-Sheet 2 Dec. 19, 1933. L, MORSE 1,939,717

' PAPER FEEDiNG MECHANISM Original Filed Dec. 6, 1927 5 Sheets-Sheet 3 gwuvntoz M,M%WZM DOC. 19, 1933c MQRSE 1,939,717" PAPER FEEDING-'MECI iANIS H Original Filed Dec. 6, 1927 5 Sheets-Sheet 4 Patented Dec. 19, 1933 PATENT OFFICE UNITED STATES PAPER, FEEDING MECHANISM ware Original application December 6, 1927, Serial No. 238,034.- Divided and this application June 16, 1930; Serial No. 461,289

Claims. (c1. 271--2.6)

the web of paper for each feedingcycle, enablesprinting of the web to be effected successively, in proper registration with either a prior or subsequent operation on the paper, for example, where, in conjunction with a printing machine, successive imprints are intended to fill in forms previously printed; or where, in conjunction with a perforating machine, the paper strip is to be partially perforated and it is necessary that the perforations be accurately spaced, so that subsequent imprints made thereon will come between successive perforations; or where, in conjunction with a printing machine, the paper is to be cut up into labels after printing,--in these and various other instances it is essential that the feeding be accurate and that there be no accumulating errors. This invention includes a device which positively insures a definite length of strip being fed at each operation of the feeding mechanism.

My invention is hereinafter more fully explained in connection with the drawings, which show a preferred embodiment in conjunction with a printing machine and a shearing mechanism adapted to cut the web into individual labels after it has been printed.

In the drawings, Fig. 1 is a side elevation of a complete apparatus, including my improved paper feed and a multigraph machine and a shearing mechanism; Figs. 2 and 3 are vertical, longitudinal sections of the apparatus shown in Fig. 1, in planes parallel with Fig. 1, the location of these planes being indicated by lines 2--2 and 33 on Fig. 4; Fig. 4 is a vertical, transverse section through the axis of the feed drum, as indicated by the line 4-4 on Figs. 1 and 3; Fig. 5 is a detail, illustrating the releasable drive .for the feed drum; Figs. 6 to 9 inclusive are diagrams illustrating the course of the paper as fed by the mechanism, respectively at the. start of the forward feed of the paper, at the completion of the forward feed of the paper, at the conclusion of a retraction of the fed paper and. just after the shearing of the foremost section.

In Figs. 1, 2 and 3, I have illustrated a usual multigraph printing machine comprising the following members, namely; end frame plates 10 and 11 projecting upwardly from a base 12, and journalled in these end plates, a shaft 14 on which are mounted rings 15, resting on which is a segment 17 shown as secured to the shaft 14 by spring hooks 18. The segment carries suitable printing form which is illustrated conventionally at 20. This printing form may be a blanket carrying embossed strips, as shown in Patent No. 1,438,580, of my assignee, The American Multigraph Company, or the segment may be provided with rails carrying individual type, as is frequent in the multigraph. Suitable means are provided for inking the multigraph form, for instance, ribbon spools, as at 25 and 26, mounted in the segment drum and carrying a ribbon 27 overlying the form.

Mounted in the frame members of the multigraph, parallel with the drum shaft, is a platen shaft 30. On this shaft is rotatably mounted a rubber faced platen roller 31 adaptedto coact with the form. This platen roller is connected by a gear 33 to a gear 34 on the drum. In the present machine the multigraph just described is geared with a paper feed drum to feed the paper periodically between the multigraph drum and platen.. 1

The frame of the paper feed mechanism shown comprises a pair of

uprightplates

40 and 41 secured to a suitable base 42. J ournalled in these upright plates is a shaft 44. Rigidly mounted on this shaft is a drum 45 having a smooth cylindrical periphery. Coacting with this drum for about half its circumference are several endless belts 50, three being shown. These belts loop over a roller 51 above the drum 45 and a roller 52 below 95 it, each of these rollers being beyond the central vertical plane of the drum. The outer reaches of the belts also pass over a guide roller 53, journalled in the frame plates and over a tension roller 54 carried by a pair of levers 55 pivoted to the respective frame plates. Tension springs 56 acting on these levers tend toswing the roller 54 away from the drum 45, and thus tension the belts, maintaining the inner reach tight against the drum for about-half its periphery. The belts are driven in correspondence with the peripheral movement of the drum by a gear 57 on the drum operating idlers 58 to a gear 59 on'the roller 52.

The web of paper is fed into the grip of the belts and the drum 45 beneath the roller 51 and The paper is supplied to the machine in the form of a roll A1, Fig. 1, and this roll is suitably -mounted, as for instance, by having an axial rod 60 resting in recesses in brackets 61 suitably carried. A brake is provided in the form of a comparatively heavy plate 63 adjustably carried on rods 64 pivotally supported at one end, the weight resting by gravity against the surface of the roll. .From the roll the web passes downwardly and then upwardly about a floating roller 66. This roller is carried in a suitable bail 67 pivoted at 68 to the brackets 61 and given a downward tend-' ency by tension springs 69.

After leaving the roller 66, the paper passes upwardly across the inner side of a rod 70 (Figs.

1 and 3), which has its ends mounted in slots 71 in brackets 72 secured to the

plates

40 and 41. Suitable wing nuts as '74, Fig. 1, may clamp the rod in the desired position in the slot. Accordingly, this rod may stand in an angular position with reference to the web of paper, and thus serve to direct it laterally toward either side of the machine as desired, and thus properly centralize it on the feed drum. This avoids the necessity of accuracy in placing the supply roll A1.

From the guide rod '70 the paper web passes upwardly over a guide roller 76, and then between a pair of edge guides and 81. These edge guides are best shown in Figs. 3 and 4.- They comprise blocks slidably mounted on a square rod 83 carried by the

frame plates

40 and 41, each block having a lip 84 adapted to support the paper adjacent the edge, and an upright wall '85 to engage such edge. The blocks are clamped in adjusted positions by set screws 87.

From the guides 80 and 81, the paper web A passes around the guide roller 89, and thence toward the front beneath the belt roller 51, and between the belts and the drum 45, leaving the underside of the drum. The web A passes from the the drum on top of the belts until it leaves the feed mechanism per se, and enters the multigraph machine passing between themultigraph drum and its platen, where it is printed as desired.

The multigraph drum in this apparatus is continuously rotated, but the printing form occupies only a fraction of the total periphery of the drum,-

and accordingly as the paper passes directly from the paper feed drum to the multigraph, the paper feed drum must have the same peripheral speed of the multigraph drum, but' must operate intermittently. To effect this, I may use a ratchet mechanism, best illustrated in Figs.- 2, 4, 5 and which will now be described.

As is shown, I have mounted freely on the shaft 44 of the paper feed drum the hub of a gear 91, this gear normally meshing with an idler 92 which meshes with the multigraph gear 34 mentioned. The loose gear 91 has pivoted to'it a pawl 93 (Figs; 2 and 5) which is adapted to coact with a ratchet wheel 95 which is rigidly connected with the feed drum 45. I have shown the ratchet wheel rigidly mounted on a sleeve hub 96 which extends through the frame plate 40 and is pinned 'at 97 to the shaft 44, the drum 45 being also cam 100, 101 on which rides a roller 97 carried by the pawl, this roller being pressed against the periphery of the cam by a spring 98 secured to the gear at 99. The cam is of an adjustable extent and preferably comprises two rings side by side. As illustrated in Fig. 4, one of these rings, designated 100, may be secured as shown to theframe member 40, and the other ring 102 may be loose upon a clamping ring 105, which may be supported by screws 106 mounted in the frame plate. These screws will thus serve to draw the plate 101 tightly against the plate 100, so that they act as a unitary stationary cam, but by loosening these screws the ring 101 may be shifted circumferentially, and thus vary the arcuate length of the cam region. Both the rings have a concentric periphery for a considerable portion of their extent.

The cam region is adjusted in extent with reference to the arcuate length of the form 20 on the multigraph drum. The concentric portion of the compound cam maintains the driving pawl 93 idle, but the cam region allows that pawl ,to come into engagement with ratchet teeth, under the influence of the spring 98, for a distance somewhat greater than the length of the form 20, so that paper is fed for a distance greater than the form. The length of the nonconcentric region of the cam determines the duration of the feed of the paper.

As heretofore described, I desire to feed the paper an accurate amount and to accomplish this I prefer to over-feed the paper beyond the length required for printing, and then retract it to a definite stop. I effect this by the following mechanism:

On the shaft 44 of the feed drum, outside of the plate 40, is a brakev drum 110, Figs. 1 and 4. Around this drum is a brake band 111, the end portions of which have

blocks

112 and 113 mounted on them. A rod 114, pivoted to one of these blocks, extends loosely through the other and beyond that'block is surrounded by a compression spring 115 adjustably compressed by nuts 116.

About the mid region of the brake band 111 there is secured to it a tongue 117 which projects between a pair of stop pins 118 and 119 on the frame plate 40. A tension spring 120 is connected to the tongue 117 and tends to pull it against the pin -118. The spring 115 is so adjusted thatthe friction on the brake drum will lock the brake to the drum against displacement when there is no power on the drum, but

'the friction is not sufiicient to interfere with the normal power driving the drum independently. Accordingly, power on the drum will rotate it and carry the brake with the drum as far as possible. It will be seen from the above description that when the machine is standing idle the brake drum is in the position shown in Fig. 1, with the tongue 117 against the pin 118. Now, when power is applied, tending to rotate the drum counter-clockwise in Fig. 1, the brake band travels with it until the tongue 117 engages the pin 119. Then the brake band can go no further, and the brake drum 110 rotates within the brake band.

Rigidly. mounted on the shaft 44 is a ratchet wheel 129,. which is similar to the ratchet wheel 95. A suitable detent pawl 130 engages the ratchet wheel 129, and when active prevents backward movement thereof. This pawl is mounted on a rock shaft 131, journalled in the

frame plates

40 and 41. On this rock shaft is an arm 133, Fig. 1, carrying a roller 134. When the brake is in the position shown in Fig. 1, this roller 134 rests on the surface of the brake band and enables the pawl 13.0 to engage the teeth of the ratchet 129, as shown in Fig. 2. When, however, the power is applied to the shaft 44 (that is, when the traveling pawl 93 is engaging the ratchet tooth) the brake is thereby rotated and brings a cam 135 on the brake band under the roller 134. This lifts the pawl 130 from the ratchet.-

Now, 'when the

compound cam

100, 101, is set according to the form on the multigraph drum, and the multigraph drum is rotated, the driving pawl 93 engages the ratchet and turns it for a distance corresponding to the non-concentric cam region and when doing so lifts the detent pawl 130 to idle position. This is the action while paper is fed with the multigraph. Now the

cam

100, 101 is so set that it maintains the feed until after the form has well cleared the paper, and then the cam roller 97 comes. onto a concentric portion of the-compound cam, and is thus withdrawn to idle position when the feed stops.

As the power is taken off of the ratchet by the withdrawal of the pawl 93, the. spring 120 acting on the brake turns the drum in the reverse direction. This draws the paper back through the pass of the multigraph drum and its platen (which is now open by reason of the printing form having moved past the platen) until the cam 135 on the brake band clears the roller 134. This causes the pawl 130 to come into active position and stops the retraction at a definite point.

- It will be seen, therefore, that by the mechanism described, the successive rotations of the multigraph drum are accompanied by a periodic feed, at the same speed, of the webof paper for a distance in excess of the arcuate extent of the form, and then, shortly after that form clears the paper, the paper is drawn back for the amount of that excess. fully explains, I have found that this over-feeding, together with the drawing-back accomplishes a very accurate feed of the paper.

The multigraph is frequently mounted on the top of a plate carrying power transmitting gearing, which plate is mounted on top of a suitable stand. The paper feed mechanism may readily have its frame and other parts connected to such multigraph support. Thus, as shown in Figs. 1, 2 and 3, the multigraph frame rests on a plate 140, which rests on top of a usual tubular stand 141. The base plate 42 of the paper feed may be provided with a horizontalflange 142 (Fig. 3)

and a vertical flange 143 engaging the top and vertical wall of the multigraph transmission frame 140. Suitable screws as 145 may look the paper feed frame to the multigraph transmission plate. At its opposite edge the paper feed frame may be readily supported by upright standards 147. The rod 64 carrying the braking weight 63 may readily be a rock arm on a shaft 65 journalled in brackets 148 clamped to standards of the multigraph frame 141. The paper roll supports 6l may be clamped to the standards 147 of the paper feedi One of the springs 69 is shown as anchored to an arm 149 secured to one of those standards.

The above described construction is simple and inexpensive and has the advantage of intimately connecting the paper feed frame with the multigraph support and at the same time does not As hereinafter more interfere with the multigraph being lifted oil! of its support, whenever desired without disturb-' ing the paper feed.

I have shown the multigraph, as driven by gearing carried by the plate 140, which rests on the multigraph stand. As shown in Figs. 1, 2 and 3, this plate has suitable bearings in which is journalled a shaft 150, carrying a driving pulley 151, a belt 152 is shown as running onto this pulley from a suitable motor 153. At the end of the shaft 150 is a gear 155, (Figs. 2 and 4), which may mesh with the gear 33 of the platen, which drum. As this gear 34 is connected through the idler 92 with the paper feed,'it will be seen that the motor 153 supplies the power for both the multigraph and the paper feed. The same power operates a suitable shearing knife, about to.be described.

The knife which shears off the successive printed sections is illustrated in Figs. 1 to 3, inclusive. It comprises a blade 160 pivoted, intermediate its ends, on a stud 161 secured to a block 163 which carries a stationary bar 164 with which the blade coacts. The block 163 carrying the knife may readily be mounted on a frame plate 162 secured to the multigraph base The blade 160 is shown in the drawings in its normally elevated position. It is given a tendency to swing down to coact with the bar 164 by 171 pivoted to a depended portion of the block 163. The other arm of this bell crank is connected to an adjustable clamp 1'75 locked by a in turn meshes with the gear 34 of the multigraph screw in the desired position to a rod 176. This rod is rigidly connected to a yoke 177 slidably mounted on the powertransmission base 140 of the multigraph machine. On such transmission mechanism, we provide a pinion 180 on theshaft 150 on the outer side of the gear 155. This pinion meshes with a gear 181 on a shaft 182 (Fig. 6) journalled in a downward flange 183 of the frame plate. On the outer end of this shaft 182 is a cam 186 which coacts with a roller 187 on the sliding yoke 177. The relative sizes of the pinion 180 and the gear 181 are such that the gear 181 makes one rotation for each rotation of the multigraph drum.

The .cam 186, bearing against the roller 187, normally holds the yoke in its left-hand position (Fig. 1) and this maintains the knife elevated, shown in Fig. 7. However, at the proper time (which is after the paper feed drum has drawn back the over-fed web to a definite stop provided by the detent pawl 130), the re-entrant angle-of the cam comes opposite the roller 187 and the yoke is allowed to move toward the right and thus the knife is swung down under the power-of the spring 165, thus cutting off the extreme portion of the printed web. This action takes place once for each rotation of the multigraph drum.

It is desirable toprovide continuously acting ejector rolls to retain the web in tension between the multigraph printing drum and the shearing knife. To that end, I provide

rollers

190 and 191, (Fig. 3), carried in suitable standards 192, the roller 190 preferably carries the gears 195, which meshes with the gear 196, loose on the roller 191. This latter gear is connected by an idler 197, with the gear 34 on the multigraph drum. The forwardly rotating roller 190 maintains some tension of the paper, but the paper may be rapidly pulled backwards over it, while the roller 191 partakes of the movement of the paper, being driven frictionally thereby.

It will be understood from the description above given of the embodiment shown in the drawings, that I have provided a comparatively simple feeding mechanism feed or web of paper, accurately in definite amounts. As illustrated and described, in conjunction with a multigraph, my feeding mechanism feeds a continuous web of paper accurately to the multigraph, in amounts corresponding to the extent of the form of the multigraph drum. The printed web may be disposed of by winding it up or fan-folding it if desired, but I have diagrammatically indicated a knife to shear ofif'the sections of the web corresponding to the amount printed. While my arrangement. of over-feeding the web and then drawing it back, to a definite stop related to the position of the segment on the printing drum, has its greatest advantage where the web is sheared in sections, it is still advantageous, irrespective of the disposition made of the printed web. This matter of over-feeding and then drawing back the web to a stop related to the position of the segment is so important that I have illustrated the various phases thereof by diagrams in Figs. 6 to 9, to which we will now refer.

Each of the diagrams is in the nature of a side elevation of the combined machine and illustrates the paper feed drum 45, brake band 110 with its tongue 117, the

stops

118 and 119, limiting the position of the brake band, the printing drum 17, its segment'20, ejector rolls 190 and 191, and the

sheathing blades

160 and 164.

Suppose the segment 20 has such arcuate extent that four imprints of the segment with the desired margin above and below will reach from the shearing plane of the

blades

160 and 164 to a point slightly to the left of the radial plane connecting the axis of the multigraph drum and platen, the distance of the over-reach being designated as Y. Such four imprints are illustrated in Fig. 6, designated a, b, c, and d. The first rotation of the multigraph drum is supposed to have printed the imprint a, and the second rotation the imprint b, the third 0, and the fourth d. Fig. 6 shows the parts standing just before the fifth imprint is about to be made. As the segment 20 in the fifth rotation reaches a point, which is the distance Y on the periphery of the segment drum 1'7, from. the radial plane connecting the axes of the multigraph drum and the platen, the cam and ratchet arrangement throws the power onto the drum 45 which rotates in the direction of the arrow R. When the segment 20 in its continued rotation reaches the radial plane connecting the axes of the multigraph drum and the platen, the paper is moving with it, having been fed by the paper feed for the distance Y, so that there is no tendency of the first line to smudge. The fifth imprint is made with its advance edge at the rear edge of the fourth imprint, and immediately following that imprint the paper continues to advance a further distance,

designated X.

It will be seen that the paper is fed by paper feed drum, the multigraph and the ejector rolls not only the distance corresponding to an imprint, but a distance equal to the sum of the distances ,Y and X in addition. This carries the fifth imprint e beyond the segment for the distance X, as shown in Fig. 7, so that there can be no smudging of the last line, and also carries the section a to be cut off for the distance equal to the sum of the distances X and Y beyond the stationary blade 164. Now, the power is released from the drum 45, and the spring acting on the brake gives the drum a reverse rotation in the direction indicated by the arrow R1, so that the paper feed comes into the position shown in Fig. 8, the printing drum in the meantime continuing its rotation. This carries the excess portion X and the portion Y of the fifth imprint e to the other side of the vertical plane through the printing couple axes and brings the junction of the imprints a and b directly at the edge of the blade 164. Thereafter, while the printing drum is continuing its movement, but while the feed drum is stationary, the knife 160 is lowered, shearing off the section a, which may fall on top of the precedingly sheared sections a1, as shown in Fig. 9.

If the amount of over-feed varies somewhat according to the speed of rotation of the machine, this is entirely immaterial as the retraction is always a corresponding amount and brings back the strip into a definite relation to the segment on'the drum. The controlling cam is so set that the pawl is lifted from the ratchet wheel ,on the drum about as soon as the section printed has proceeded beyond the vertical plane through the printing couple axes a suificient distance to certainly clear the segmental form, and then the spring acting on the brake draws the strip back until the detent pawl is impinged by a ratchet tooth. If higher speed results in increasing the over-feed of the web the ratchet wheel will be turned correspondingly furtherand there will be a greater reverse rotation in bringing a tooth of that wheel back against the detent pawl. The teeth of the ratchet wheel are of great enough extent so that there will be one certain tooth appropriate to engage the detent pawl when the forward feed stops.

As heretofore stated, my system of over-feeding and retracting the web has great advantagesv where the web is cut off periodically, because it not only enables the cut-off portions to be accurately of the same size, as illustrated in Fig. 9, but it also properly positions the imprints on the regions to be cut off, so that there is no danger of an unduly narrow margin at one edge and a 1. In a paper feed mechanism, a rotary feed. roll adapted to act on a web of paper, means including a ratchet mechanism adapted to periodically rotate the feed roll, and constantly acting frictional means independent of the ratchet 2. The combination of a paper-feed roll, a drive for said roll, a releasable connection between the drive and the feed roll to .give the feed roll a partial rotation, a rotor movable with the paper feed roll, a member in constant wiping engagement with said rotor, a spring adapted to act on said member to cause the rotor to give the feed roll a partial rotation when the'drive is disconnected.

3. In a paper feeding mechanism, the combination of a rotary member, means for frictionally retaining a strip of paper against said member, means for giving the member a suflicient rotation to feed the strip approximately the desired amount, and a spring constrained by the last mentioned means for thereafter giving a comparatively small movement to the member to vary the feed.

4. The combination of means for carrying a web of paper in the form of a wound-up roll, a

rotary member which said web engages in ad vance of the roll, means for periodically acting on the rotary member to give it a sufficient rotation to feed the web the approximately desired amount, and normally idle frictional means for thereafter action onthe rotary member to give it a small portion of a rotation to precisionize the feed.

5. The combination of a paper feed drum adapted to feed a web of paper, mechanism for periodically giving the paper feed drum a .partial rotation, a brake acting on said paper feed drum and not interferring with its rotation by power, said brake being shiftable to turn the drum a predetermined distance, and means for so moving the brake and thereby giving a fractional' rotation to the drum when the power is cut off.

6. The combination of a rotary member, means for pressing a web of paper against the rotary member, means for periodically acting on the rotary member to give it a suflicient rotation to feed the web the approximately desired amount, a brake acting upon therotary member and adapted to prevent its over-feed by.

momentum during the main operation of the rotary member, and means whereby said brake may thereafter act on the rotary member to give it a small portion of a rotation to precisionize the feed.

'7. The combination of a paper feed drum, a driving gear therefor rotatable independently thereof, a ratchet wheel on the paper feed drum, a pawl on the driving gear, means adapted to cause the movementof the pawl into and out of coaction with the ratchet wheel on each rotation of the driving gear, a detent pawl preventing reverse movement of the ratchet wheel, means for moving said detent pawl to idle position when the engagement of the pawl with the ratchet wheel rotates the paper feed drum, and means tapes and drum and thence downwardly and backwardly between the tapes and drum, a transverse bar over the drum and beneath the web, and edge guides slidably mounted on the bar.

9. In a paper feeding mechanism, the combination of a rotary feed member adapted to act on the paper, powenmeans for operating the feed member to feed the paper, and a precisionizing device automatically operating on the feed member independently of the power to adjust the position of the feed member.

. 10. In a paper feed mechanism, a rotary feed member adapted to feed a web of paper, means adapted to periodically rotate the feed member and means constantly acting frictionally on the feed member and available subsequent to the rotating means to set the feed member in a definite position relative to the web.

11. The combination with a power driven paper to pull back the fed web when the power isreleased. e

14. The'combination of a paper feed mechanism, means for intermittently applying power thereto, constantly acting means tending to reverse the paper feed mechanism but efiective only when the power is ofi.

15. The combination with a paper feed mechanism, power means for driving the same, a constantly acting spring tending to reverse the paper feed mechanism during the driving but efiective only when the power is off.

16. The combination of a paper feed drum, a. brake wheel -rigid therewith, a brake band about said wheel capable of shifting bodily in a rotative direction with the wheel, means for limiting such rotative movement of the brake band, mechanism for driving the drum and thereby shifting the brake band to its limit, the wheel thereafter slipping within the band, and means for retracting the brake band and thereby giving the drum a partial reverse rotation when the power drive has ceased.

17. The combination in a paper feed mechanism, of a drum adapted to feed a web, mechanism for periodically moving the paper feed drum, a shiftable brake for said paper feed drum not interfering with its rotation by power, and means for retracting the brake and thereby giving a partial reverse rotation to the drum when the power is cut oil.

18. The combination of a paper feed drum adapted to feed a web of paper, mechanism for periodically giving the paper feed drum a partial rotation, a constantly acting brake for said paper feed drum not interfering with its rotation by power, said brake being shiftable a predetermined distance with the drum, and means for retracting the brake and thereby giving a reverse rotation to the drum-when the power iscut ofi.

19. The combination of mechanism for feeding paper including a paper feed drum, a brake wheel rigid therewith, a brake band about said wheel, mechanism for driving the drum and thereby shifting the brake band a short distance, the 1 on the drum to retract the paper.

wheel thereafter slipping within the band, and means for retracting the brake band and thereby giving the drum a partial reverse rotation when the power drive has ceased.

20. The combination of a rotary paper feed drum, mechanism for giving the paper feed drum a partial forward rotation for each complete cycle of operation to feed the web of paper, a friction brake on said paper feed drum bodily movable with the drum a short distance, and av spring for retracting the brake when the power is relieved 21. The combination of .a paper feeddrum, a driver for said drum, a releasable connection between said driver and paper feed drum to give the paper feed drum a partial rotation, a brake wheel movable with the paper feed drum, a brake band on said wheel frictionally engaging it and adapted to be moved by it a short distance, a stop for such movement, and a spring for returning the band and thereby giving the paper feed drum a partial rotation in a reverse direction following the disconnection of said driver and paper feed drum.

22. The combination of mechanism for feeding paper including a paper feed drum, a driving gear therefor rotatable independently thereof,

a ratchet wheel on the paper feed drum, a pawl on the driving gear, means adapted 'to cause the movement of the pawl into and out of coaction with the ratchet wheel on each rotation of the driving gear, a detent pawl preventing reverse movement of the ratchet wheel, means for moving said detent pawl to idle position when the engagement of the pawl with the ratchet wheel rotates the paper feed drum, and means adapted to rotate the drum in the reverse direction when the pawl is out of engagement with the ratchet, said last mentioned means serving also to interpose the detent pawl into the path of the ratchet as the paper feed drum is reversely rotating.

23. The combination of a paper feed drum, a driving gear concentric with the paper feed drum located at one end thereof, a ratchet wheel on the paper feed drum, a pawl on the driving gear, an adjustable cam adapted to cause the movement of the pawl into and out of coaction with the ratchet on each rotation of the driving gear, a

brake drum rigid with the paper feed drum, a brake band acting frictionally on the brake drum and movable with it between limits, a detent' pawl preventing reverse movement of the ratchet wheel, a cam on the brake drum adapted to move the detent pawl to idle position when powerapplied to the ratchet rotates the paper feed drum, a spring acting on a brake band and adapted to return it when the cam moves the pawl out of engagement with the ratchet, the cam on the brake drum thereupon interposing the detent pawl into the path of the ratchet as the paper feed drum is reversely rotating.

24. The combination of a rotary feed member, adapted to feed a web of paper, mechanism for periodically rotating the paper feed member, a second mechanism having a slip connection with the feed member, so as to be engaged but idle during the action of the first mechanism, and means acting on the second mechanism to rotate the paper feed member, whereby the arcuate movement of the member due to the operation of the first mechanism may be indefinite, but

whereby the arcuate movement of the member due to the summation of the operation of both mechanisms is a predetermined and definite amount,

25. In a paper feeding mechanism, means including a feed roll adapted to act on the paper, for periodically feeding a web of paper, and constantly engaged frictional means acting on the paper feed roll for periodically adjusting the feed roll when the normal feeding means is 'idle to render the feed accurate.

LAWRENCE H. MORSE.