US1804406A

US1804406A - Conveying system

Info

Publication number: US1804406A
Application number: US70462A
Authority: US
Inventors: Theodore A Federwitz; Walter T Bailey
Original assignee: Stokes and Smith Co
Current assignee: Stokes and Smith Co
Priority date: 1925-11-21
Filing date: 1925-11-21
Publication date: 1931-05-12
Anticipated expiration: 1948-05-12

Description

May 12, 1931. T. A. FEDERwaTz ET AL CONVEYING SYSTEM W w w il ATToRNEY.

8 Sheets-Sheet l `Filed Nov. 21, 1925 LBMAS 8 Sheets-Sheet 2 E mllllllllllllIIlHHhHHllrlHilllllhuul ''.vA. FEDEIRWETZ ET AL,

CONVEYING SYSTEM Filed Nav. 21, 1925 May u2, wm.,

Lam-A@ T. A. FEDERWBTZ ET AL CONVEYING SYSTEM Maly l2, 19M.,

Filed Nov. 2l, 1925 8 Sheets-Sheet 3 M 2, (d QM #im ATTORNEY.

May 12, 1931.

T. A. FEDERWITZ ET AL CONVEYING SYSTEM Filed NOV. 2l, `1925 8 Sheets-Sheet 4 I N VEN TORS d. Z E Z ATTORNEY.

May 12, 1931. T. A, FEDERwlTz ET Al. 1,804,406

CONVEYING SYSTEM Filed Now 21, 1925 8 Sheets-Sheet 5 INVENTORS BY fam -f/ ma. xiv;

' im ,fiTToR/VEV.

May l2, 1931. T. A, FEDERwlTz r-:T AL 1,804,406

CONVEYING SYSTEM Filed Nv. 21, 1925 8 Sheets-Sheet 6 I N VEN TORS fbg ATTORNEY.

May l2, 1931. r. A. FEDr-:RWITZ ET Al. 1,804,406

CONVEYING SYSTEM Filed Nov. 21, 1925 8 Sheets-Sheet 7 1.?4fa 30 12g' 30a afa 3f ff A INVEIQTORS 7L@ LW M' By /Ma 7 M T. A. FEDERWITZVETAL CONVEYING SYSTEM' Filed Nov. 21, 192

May 12, 1933.

a sheets-sheet 8 Patented Y May 12, 1931 UNITED STATES PATENT OFFICE THEoDoRE A. EEDERWITZ AND WALTER T. BAILEY, or PHILADELPHIA, PENNSYL- VANIA, ASSIGNORS TO STOKES AND SMITH COMPANY, OF PHILADELPHIA, PENN- SYLVANIA, A CORPORATION OF PENNSYLVANIA CONVEYING SYSTEM Application led November 21, 1925. Serial No. 70,462.

Our invention relates to the art of feeding wrappers, sheets, labels, or equivalent, hereinafter termed sheets, to a machine or unit, as a wrapping machine, a box-wrapping or 5 covering machine, a package-wrapping machine, a can-wrapping machine,or equivalent, hereinafter termed a wrapping unit or wrapping machine, which applies the sheet to any desired box structure. 1

In accordance with our invention,`sheets, as aforesaid, are coated, either partially or entirely, with adhesive by suitable mechanism, as an adhesive applyingun'it and are fed, preferably directly from the glue roll of said unit to sheet gripping mechanism ac tuated in timed relation with said unit.

Further in accordance with our invention, a system of moving tubes or rods pneumatieally retaining individual sheets in engagement therewith `functions to deliver said sheets in timed relation to a wrapping unit, as aforesaid, and more particularly, said system comprises a reciprocatory tube or tubes pneumatically retaining an individual sheet 1n engagement therewith while moving in one direction to transport the sheet to a station, where it is pneumatically retained after re. lease from1 said tube or tubes.

Further in accordance with our invention, lindividual sheets are transported from suitable mechanism', as an adhesive-appl 'ng unit, toward a wrapping machine, as agiresaid, by conveying mechanism comprising structure for mechanically gripping the retaining individual sheets during transportation through one region and by other conveying mechanism comprising structure forv pneumatically retaining individual sheets during transportation through another region, and more particularly, said eonveyin. mechanism first mentioned is operated to e fect a higher velocity of sheet movement than 'is effected by said 'conveying mechanism second mentioned.

Further in accordance with our invention, a system comprising a. tube or tubes pneumatically retaining a sheet while effecting delivery to a station comprising pneumatic sheet-retaining structure is controlled by a suitable master valve, to the end that the sheet in elevation showing a part of the conveying mechanism.

Figure 3 is a vertical sectional view partly in elevation showing the delivery ends of the sheet and box conveying mechanisms and a part of the associated wrapping unit. Figure 4 is a horizontal sectional View partly in elevation taken on line 4 4 of Fig. l looking in the direction of the arrows.

Figure 5 is a horizontal sectional View partly in elevation taken on line 5 5 of Fig. 2, looking in the direction of the arrows.

Figure 6 is a horizontal sectional view partly in elevation taken on line 6 6 of Fig. 3, looking in the direction of the arrows.

Figure 7 is an elevational view showing the drive mechanism for the sheet conveying mechanism and a part of the associated wrapping machine.

Figure 8 is a vertical sectional View on line 8 8 of Figs. 1 and 4, looking in the direction of the arrows.

Figure 9 is a vertical sectional view on line 9 9 of Figs. l and 4, looking in the direction of the arrows.

Figure 10 is a vertical sectional View on line 10 1 0 of Figs. 2 and 5, looking in the direction of the arrows. V

Figure 11 is an enlarged, fragmenta vertical sectional view on line l1 11 of Fig. 12.

Figure 12 is a vertical sectional view on line 12 l2 of Fig. 11, looking in the direction of the arrows.

Figure 13 is an elevational View looking in `the direction of the arrow 13 of Fig. 10.

Figure 14 is a vertical sectional view on line 14 14 of Fig. 2, loking in the direction of the arrows.

Figure 15 is a vertical sectional view on line line 18-18 of Fig. 17, looking in the direction of the arrows.

Figure 19 is a vertical sectional View online 19-19 of Fig. 17. looking in the direction of the arrows.

Figure 20 is a. horizontal sectional View partly in elevation taken on line 20-20 of Fig. 19, looking in the direction of the arrows.

Referring to the drawings, there is shown an adhesive-applying unit G and a wrapping machine W, or equivalent, as aforesaid, said wrappin g machine comprising the form block structure w. Unit G and machine W are cooperatively related by mechanism which synehronizes the operations or movements of the unit G with the operations or movements of the machine W and by a conveying or transferring unit C delivers to the wrapping machine W boxes, or equivalent. as aforesaid, 'and sheets, or equivalent, as aforesaid, the latter gummed or glued and delivered by the unit G to the transferringr unit C.

The adhesive-applying unit G may be of any suitable type capable of applying adhesive to sheets of box-wrapping paper. or other suitable material, and delivering the gummed sheets in succession at uniform intervals. In theexample illustrated, the unit G is of the same general type disclosed in Nitsch and Federwitz Letters Patent No. 1,472,614, granted October 30, 1923.

The wrapping machine W may be of any suitable character, and in the example illustrated is broadly of the type disclosed in prior Letters Patent to Smith No. 691,329, and more specifically of the type disclosed in prior Letters Patent to Nitsch and Feder- Witz No. 1,540,900, and still more specifically .of the character disclosed in our prior Letters Patent Nos. 1,541,036 and 1,541,255.

The conveying unit C. however, is of novel construction, and is preferably of such form as to constitute a unit which may he added as an attachment to or a bridge for another set of machines or mechanisms, or more particularly to a wrapping machine 1V, or equivalent, and an adhesive-applying unit G, or equivalent.

The adhesive-applying unit G is driven at suitable speed by any suitable source of power and operates to move single sheets in succession from the stack i of unglued sheets through the rotary feed roll mechanism desg ignated generally at I) and into engagement with the gluing roll c, where there is applied, on one side thereof, any suitable adhesive, as glue. The sheets after being stripped and deflected fromthe glue roll o are engaged and transported by conveying mechanism associated with the adhesive-applying unit G, as hereinafter described.

Sheet transporting mechanism of the 0071- oeyer unit The unit C comprises a base 1 supporting a. casing 2, from which rise the parallel spaced side frames 3 and 3a.

A shaft 4, journaled in the frame of the wrapping unit V and the casing 2 carries a pulley P driven by any suitable source of power and a worm gear 5 meshing with and rotating a worm wheel 6, preferably formed integrally with a barrel or drum cam 7 rotatably mounted in the casing 2. A cam track 8, formed on the outer surface of cam 7, receives a roller 9 rotatably mounted on a stud 10 carried by one arm of a bell crank lever 11 pivoted to the casing 2. The other arm of lever 11 terminates in a. gear quadrant 12, meshing with a pinion 13 keyed to a shaft 14 mounted in bearings in the side frames 3 and 3a.

Exterior-ly of sido frame 3a, a gear 14m, keyed to shaft 14 meshes with a gear 14n keyed to a shaft 15 mounted in bearings on side frame 3a. A gear 16, keyed to shaft 15, meshes with a gear 17 freely rotatable on a shaft 18 mounted in bearings in the side frames 3 and 3a.

Shaft 18 may be manually rotated inde' pendcntly of gear 17 to effect adjustment of certain rack structure, hereinafter described. `Wl1en so adjusted, gear 17 may be secured to shaft 18 in any suitable manner, preferably, however, by a flanged collar 19 formed integrally with said gear. with which co-acts a collar 2-0 secured to shaft 18. A clamping bolt or screw 21 passes through a circumferential slot 22 in collar 20, and when threaded into collar 19, Figs. 10 and 13, binds the two collars together, to the end that rotation of shaft 18 is effected in response to rotation of gear 16. If desired, the face of collar 19 removed from gear 17 may be provided with a suitable scale, as indicated in Fig. 13,

and collar 20 may be formed with a pointer 23 movable over the scale.

A pair of conveyer frames 24 and 24a, each adjustable in a lateral sense are supported by rods R and R1 extending transversely of and carried by 'side frames 3 and 3a. Any suitable mechanism may be utilized to effect equal and simultaneous adjustments of each of said conveyer frames either toward or from the longitudinal axis of the conveyer unit C whereby sheets of various lengths may bc conveyed. If desired, this mechanism may take the form of that disclosed in our prior application Serial No. 40,769, filed July l, 1925.

Brackets

25 and 25a, carried respectively by conveyer frames 24 and 24a. are

arranged to rotatably support the

sleeves

26 and 26a, splined to shaft 18, F 10. `Gear wheels 27 and 27a, suitably secured, respectively, to

sleeves

26 and 26a, mesh with

racks

28 and 28a suitably secured respectively to'

sleeves

26 and 26a. Carried by each rack are the spaced arms 29, Figs. 5 and l0, supporting the reciprocatory sheet-transporting suction tubes 3() and 30a in substantially parallel relation with

racks

28 and 28a.

Suction tubes

30 and 30a, may be placed in communication with a master or control valve, hereinafter described, in any suitable manner. As one manner of so doing, a chamber 3l, Figs. (S and l5, provided with a tiexible tube 32 leading to the control valve is connected to suction tube 30 by one or more passages It is to be understood that suction tube 30a is likewise placed in communication itlrthe control valve in a manner similar to that described above. To this end, a flexible tube 32a, leading to the chamber corresponding with chamber 3l, is joined with tube 32, Fig. 7 and from the point of juncture, a tube 34 leads to the master or control valve V, hereinafter described. y

Extending inwardly toward the center line of the machine are the arms and 35a', carried, respectively, by

thc brackets

25 and 25a,

Fig. 10, the extremities of said arms, respec tively, adjustably supporting

guide members

36 and 36a, in turn supporting the stationary sheet-retaining

suction tubes

37 and 37a disposed substantially parallel with

tubes

30 and 30a. Adjacent the wrapping machine lV, Fig. 16, one end of tube 37a slidably mounted on a guide member 38a supported by a stud 39a extends through the conveyer frame 24a: while adjacent the unit G, the end of tube 37 is shown as resting upon a guide member 40 slidably supported by a stud 41 extending through the conveyor frame 24, Figs. 1 and 4. y

` It is to be understood that the end of tube 37 adjacent the wrapping machine W is supported in a mannersimilar to that described i with respect to tube 37a, and that the end of tube 37a adjacent the unit G is supported in i a manner similar to that described with respectv to tube 37.

The ends of

stationary suction tubes

37 and 37a extend into the region occupied by the sheet-delivery mechanism of the adhesiveapplying unit. Some distance from their immediate ends, 'said tubes areea'ch provided with a plug 42, Fig. 4, whereby each-tube is divided intotwo distinct chambers. A pipe or conduit 43'opens into a `fitting 44 having a passage 45 in communication with-the chamber in tube 37 nearest `to the adhesive-apply ing unit. A similar pipe or conduit 43a open", into the corresponding chamber in tube 37a.

Another pipe or conduit 47 opens into the chamber in tube 37 nearest the wrapping machine W, and a second pipe or conduit 47a opens into the corresponding chamber in tube 37 a.

Referring to Fig. 6, suction tube 48 is shown as extending from the chamber 31, which is carried by the reciprocatory rack 28. Said tube passes through a bearing 49 comprised in conveyer frame 24, andextends toward and beyond the forni block structure of the wrapping machine. A suction palm 50 is secured to an angular extension 51 of said suc-- tion tube substantially in alignment with the reciprocatory suction tube 80.

lt is to be understood that a similar suction palm 50a, Fig. 7, substantially in alignment with reciprocatory suction tube 30a, is likewise connected to a suction tube 48a corresponding with tube 48.

Reciprot-.atory

suction tubes

30 and 30a are provided at their ends and intermediate thereof with pairs of perforated suction heads 52 aligned transversely of the machine, the distance along each tube between neighboring suction heads being at least as great and `preferably somewhat greater than the maximum width of sheet to be transported.

Stationary suction tubes

37 and 37a are likewise provided at their ends and intermediate thereof with pairs of perforated suction heads 53, aligned transversely of the machine and spaced to correspond with the distance between suction heads 52. The suction palms 50 and 50a at the ends of tubes 48 and 48a are provided with one or more perforations or suction openings.

4Oscillatory movement imparted to gear quadrant 12 by cam 7 is eventually transmitted to shaft 18, and as the latter moves first in one direction and then in the other, racks'28 and 28a function to reciprocate the movable suction tubes 30 and 30alongitudinally of the machine.

the adhesive-applying unit G toward the Wrapping machine W, it is desirable that such sheets be supported by suitable beltstructure movable with the sheets. but remaining 'at rest during the intervals the sheets are at rest. .'Io thisfend, it is necessary to effect interinittent step-by-step.movement of the belt structure. Y

Shaft 18, 'as stated above, intermittently rotates, first in one direction and then in the other, and may be utilized'toeffect intermittent step-bystep movement of the belt structure. Preferably, such movement is attained by utilizing clutch mechanism of a type Well'known in lthe art to effect intermittent vrotation of a belt-advancing pulley always in the same direction. l and referring t0 Figs. 10, 1l, and 12,l a clutch spider 55a is suitably secured or formed integrally with sleeve 26a for rotative movement therewith. A pulley 56a, freely rotat` loo To this end.

able on sleeve 26a, is provided with a circumferential recess 57 a receiving spider 55a, said spider a comprising a series of radially tapering pockets 58a receiving the cylindrical rollers 59a, each biased into engagement with the adjacent surfaces on pulley 56a and spider' 55a by a shoe 60a engaged by a coil spring 61a.

It is to be understood that sleeve 26 is equipped with mechanism, including a belt pulley 56, which is av duplicate of that just described, and, accordingly, for the sake of brevity, the description will not be repeated.

Adjacent the wrapping machine W, the stud 39a carried by conveyer frame 24a forms a bearing' for an idler roll 62a, Fig. 16, while adjacent the unit Gr, the stud 41a, also carried by conveyer frame 24a, forms a bearing for another idler roll 63a, Fig. 9. A side belt Ba passes over idler rolls 62a and 63a and beneath the drive pulley 56a.

A side belt B, corresponding with belt Ba, passes over an idler roll 63 mounted on stud 41 carried by side frame 24, adjacent the unit G, Fig. 9, and over an idler pulley, not shown, but corresponding with roll 62a adjacent the wrapping unit W. Side belt B also passes beneath drive pulley 56, Fig. 10, and is maintained in engagement therewith by

idler rolls

64 and 65, suitably secured to the bracket 25, as by the stud 66, Fi 2. It is to be understood that side belt a is maintained in engagement with its drivepulley 56a by a corresponding set of idler pulleys, not shown.

Referring to Fig. 2,' intermittent clockwise movement is imparted to pulley 56 through the clutch mechanism described above, and as a result, the upper' span of belt B intermittently advances toward the wrapping machine W coincidentally with movement of racks 2 8 and 28a in the same direction. During reverse movement of said racks, pulley 56 and belt B remain stationary. Obviously, pulley 56a andvbelt Ba are controlled in a similar `manner.

Referring to Figs. 2, 5 and 10, a bar 67, extending between and secured to the side rames and 3a, supports a pair of brackets 68 and 69, .forming a bearing for a sleeve 70 splined to shaft 18. A drive pulley 71, free- I v rotatable on sleeve 70, may be controlled by suitable clutch` mechanism, for example, described above with respect to pulleys 56 and 56a. to lock the same to shaft 18 when it rotates in a clockwise direction, Fig. 2,1and release the same when said shaft rotatesv in reverse direction. Adjacent the Wrapping machine 1V, Figs. 6 and 16, a center belt B1 passes over an idler pulley 72 mounted on a shaft 7 3 mounted in a bracket 73m secured to the eonveyer frames 24 and 24a, by support ing structure, not shown. Adjacent the adhesive-applying unit G, belt B1 passes over an idler pulley 74 mounted ona shaft 75 mounted in a manner similar to that described above with respect to shaft 73. Belt B1 also passes beneath drive pulley 71, and is held in engagement therewith by idler rolls 71m and 7111. journaled in brackets 68 and 69.

It is to be understood that belt B1 moves in synchronism with belt-s B and Bu, and in so doing supports the central portions of the individual sheets as they are transported to ward the wrapping machine 1V.

The master value Referring to Figs. 7 and 14, a shaft76, suitably secured to cam 7, is supported in one arm of a bracket 77 carried by side frames il and 3a. A mitre gear 78, secured to shaft 7 6, meshes with a corresponding mitre gear 79 secured to a transverse shaft 80 mounted in bearings in the side frames 3 vand 3a and another arm of bracket 77. A cam drum 81, keyed to sha-ft 80, comprises a plurality of cam surfaces 82 and 82a utilizable'to actuate the valve structure, hereinafter described.

The master valve V, Figs. 17-20, comprises a casing 83 suitably lattached to bar: 67. A cover plate 84, suit-ably ,secured to casing 83, as by the screws 85, comprises a Vstem 86 provided vvith a plurality of guide passages constituting bearings v,for the valve cylinders, hereinafter described. Casing-83 comprises a vertical wall 87 providing a suction or vacuum chamber 88 connected-by a pipe or conduit 89 to a suitable vacuum pump (not shown), Fig. 18. Wall 87'is provided with a series of guide passages,` each in'fvertical alignment with the guide. passages in stem 86 referred to above. Another chamber -corresponding with chamber 88 is traversed by two spaced vertical walls 90 and' 91 extending substantially at right angles to wall 87, thereby forming three substantially

similar chambers

92, 93, and 94;. A port 95 opens from suction chamber 88 into one of the passages in wall 87 described above, and a similar port 96 opens from said passage into chamber 92, which is also placed in communication with another passage in Wall 87 by a port 97 A port 95a, corresponding to port 95, opens from suction chamber 88 into another of said passages in wall 87, and a port 96a corresponding to port 96 opens from said passage into chamber 93, which is alsoplaced in communication with another passage in Wall 87 by a port 97 a corresponding to port 97. The third chamber 94 is likewise placed in communication with two other passages in wall 87 by ports 96? and 9771, and a port 955 opens from suction chamber 88 into that passage into which port 96? opens.

Referring to Figs. 17 and 19, a valve cylinder 98a is shown as slidably ymounted in that .passage of Wall 87 communicating with ports 95a and 96a and the passage in stem 86 in alignment therewith. Cylinder 98a comprises a peripheral groove or recess 99a movable into the region of ports 95a and 96a under the influence of a coil spring 100e, or equivalent, partly confined in a recess in said cylinder and engaging a disk 1010, or equivalent, suitably secured to casing 83. Cylinder 98a further comprises a stem 102a protruding through an opening in a cover plate 103 suitably secured to stem 86. v

It is to he understood that a similar valve cylinder 98 is slidably mounted in that passage of wall 87 communicating with

ports

95 and 96, and the passage in stem 86 in alignment therewith. Further, another valve cylinder 985, corresponding with

cylinders

98 and 98a, is slidably mounted in that passage of Wall 87 communicating with ports 955 and 965, and the passage in stem 86 in alignment therewith. v

Referring to Figs. 17 and 18, a valve cylinder 104 is shown as slidably mounted in that passage of wall 87 communicating with port 97 and the passage in stem 86 in alignment therewith. Cylinder 104 is recessed throughout substantially its entire length, and one end thereof communicates directly with the atmosphere. One or more openings 105 in the -Wall of cylinder 104 may be moved into the region of port 97 by a coil spring 106, orv equivalent, partly confined in the recess mentioned above and engaging a disk 107, or equivalent, suitably secured to casing 83. Cylinder 104 further comprises a stem108 protruding through an opening in cover plate 103.

It is to be understood that a similar' valve cylinder 104er is slidably mounted in that passage of wall 87 communicating with port 97a, and the passage in stem 86 in alignment therewith. Further, another valve cylinder 1045, corresponding with cylinders 104 and 1040i, is slidablyrmounted in that passage of wall 87 communicating with port 975, and the passage in stem 86 in alignment therewith.

Stems 102, 102a and 1025, comprised in the

valve cylinders

98, 98a and 985, extend, respectively, into engagement with levers 109 pivoted, respectively, to brackets 110 carried by cover plate 84. Each lever 109 carries a roller lll'engaging one of the series of cam surfaces 82 on cam drum 81. Stems 108, 108e and 1085 comprised in the

valve cylinders

104, 104@ and 1045 extend, respectively, into engagement with levers 112 pivoted, respectively, on said brackets 110. Each lever 112 carries a roller 113 engaging one of the seriesl of cam surfaces 82a. on cam drum 81.y

As shown in Fig. 18, spring 106 holds valve cylinder 104 in its upward position, thereby opening chamber 92 to the atmosphere until lever 112 is engaged by cam track 82a and swung in a counterclockwise direction, whereupon the series of openings 115 are moved downwardly out of the region of port 97 and chamber 92- is closed from the atmosphere.

During the period that chamber 92 is open to the atmosphere, 4the lever 109 controlling valve cylinder 98 is engaged by a cam surface 82, and as a result, the circumferential groove in said cylinder is held away from the region of

ports

95 and 96. But as chamber 92 is closed, as aforesaid, the cam surface 82 controlling valve cylinder 98 moves from engagement with its co-operating lever 109, and a result, valve cylinder 98 moves to its upper position under the influence of the spring 100 corresponding with spring 100a. 1n so doing, chamber 92 is placed in cornmunication with suction chamber 88 through the

ports

95 and 96, and the circumferential groove in the valve cylinder. Accordingly, chamber 92 becomes a suction chamber, and so remains until the

valve cylinders

98 and 104 are controlled in a manner the reverse of that just described, whereupon said chamber is opened to the atmosphere.

Chambers

93 and 94 are controlled in a manner similar to that described above with respect to chamber 92, although it is to he understood that the groups of cam surfaces 82 and 82a on cam drum 81 are so located that said chambers will be exhausted to the atmosphere or placed in communication with suction chamber 88 at the proper times to effectuate advance of individual sheets toward the wrapping machine, as hereinafter described.

One ofthe chambers, for example, chamber 92, is connected to a flexible pipe or conduit 114 leading to a fitting common. to

pipes

43 and 43a connected, respectively, to the chambers in

tubes

37 and 37a nearest the adhesiveapplying unit. ample, chamber 93, is connected to a flexible pipe or vconduit 115 leading to a fitting common to

pipes

47 and 47a connected,frespec tively, to the chambers in

tubes

37 and 37 a removed from the adhesively-applying unit. Still another chamber, for example, chamber 94, is connected to a flexible pipe or conduit 116 leading to a fitting common to pipes 32 and 32a connected to chambers 31 and 31a, in turn connected to

reciprocatory tubes

30 and 30a.

Sheet-stopping mechanism Referring to Fig. 14, a mitre gear 117 keyed to shaft 80 meshes with and drives a mating mitre gear 118 keyed to a shaft 119 journaled in bearings 120 formed exteriorly of side frame 3a. A mitre gear 121 keyed to shaft 119 meshes with and drives a mating mitre gear 122 keyed to a shaft 123 mounted in bearings in the side frames 3 and 3a. A pair of spiral gears 124 and 124a, splined to shaft 123, are secured, respectively, to sleeves 125 and 125e, rotatably mounted in the conveyer frames 24 and 24a. One

time shafts

126 and 126a supported respectively by bearings, not shown, on the conveyer frames 24 and 24a carry, respectively, spiral gears 127 and 127a,

Another chamber, for exmeshing with and driven, respectively, by the spiral gears 124 and 124a.

One time shafts 126 and 126e extend longitudinally of the conveyer unit AC substantially parallel with the side frames 24 and 24a, and adjacent the adhesive-applying unit G carry, respectively, the cams 128 and 128e, Fig. 9. Once for each cycle of operation of the wrapping machine W,

cams

128 and 128a .respectively engage rollers 129 and 129e, respectively carried by levers 130 and 13064, mounted on pivots 131 and 131a carried by the respective side frames 24 and 24a. Levers 130 and 130a are held toward

cams

128 and 128@ by springs 132 and .132(1, and when depressed by said cams, rollers 133 and 133e, carried respectively by said levers 130 and 13011, engage levers 134 and 134er, mounted,

respectively, on pivots 135 and 135e, carried.

respectively by the conveyer frames 24 and 24a. A spring 13G holds lever 134 in engagement with roller 133, Fig. 1, and a similar spring, not shown, holds lever 134e in engagement with roller 133e. Levers 134 and 134a, respectively, comprise slots 136 and 136e, receivingr shanks 137 and 137 a, adjustable therein and held in adjusted position by set screws 138 and 138e, or equivalent devices. Fingers 139 and 139a, preferably formed integrally with shanks 137 and 137e, extend downwardly into the path of the oncoming glued sheet, and are periodically moved from said path in timed relation with the wrapping mechanism, as hereinafter more fully described.

Sheet-transfer mechanism between' the adhesive-applying unit and the conveyer 'lm/t Individual glued sheets after passing through the adhesive-applying unit may be transported to the receiving end of the conveyer unit C by any suitable mechanism. Preferably, however, such mechanism isof the character shown in Fig.l 1, wherein shaftv a sheet has left the glue roll and been dealent, said chains passing, respectively, over the conveyer frames 24 and 24a on pins 152 and 152e. Frames 150 and 150a extend toward the adhesive-applying unit and are mounted respectively on sleeves, not shown, formed preferably integrally with sprockets 146 and 146o. Chain guides 153 and 15311 carried respectively by frames 150 and 150a respectively support the lower spans of chains 147 and 1476!.

If the adhesive-applying unit G should become jammed, or if for any other reason it should be desirable to expose the interior mechanism of said unit, frames 145e may be swung on their pivots, not shown, to move shaft 145 and frames 150 and 150e toward the right, Fig. 1. In so doing, chains 147 and 147@ sag and

arms

151 and 151@ swing interiorly of conveyer frames 24 and 24a on their respective` pivots 152 and 152a.

As stated hereinbefore, conveyer frames 24 and 24a are adjustable in a lateral sense with respect to the longitudinal axis of the conveyer unit C, and when so adjusted, frames 150 and 150e/l move therewith, the ends of said last-mentioned frames and the gears 146 and 146er, sliding on shaft 145.

Chains 147 and 147a may be equipped with any suitable form of mechanism for gripping individual glued sheets passing from the adhesive-applying unit and transporting the same to the receiving end of the conveyer unit C. Preferably, however, such mecha- .nism takes the form of that disclosed and claimed in our pending application Serial No. 40,769, filed July 1, 1925, and, accordingly, said chains are shown as carrying transversely aligned grippers G1, each preferably taking the place of a chain side link and comprising a plate bracket 154 suitably secured to adjacent chain link pins, one of which forms a bearing for the gripper alm 155, Whose palm proper 15G vis suitably iased, as by a spring (not shown) into engagement with the circular disk or Wheel 157 mounted on a stud carried by plate bracket 154. Gripper palm 155 also comprises an arm 158, utilizable as hereinafter described.

Immediately adjacent the adhesive-applying unit, chain guides 153 and 153e carry bars 159, adjustable longitudinally thereof,

each bar comprising a cam surface 160 which co-acts with arm 158 of one of the gripper palms to depress the palm proper 156 and place the gripper in condition to receive the oncoming sheet from the adhesive-applying unit. l

In the region occupied by the ends of

suction rods

37 and 37a, chain guides 153 andv 153e carry other bars161 adjustable longitudinally thereof, each bar comprising a cam surface 162, which also co-acts with arm 158 of one of the gripper units to again depress the palm proper 156, to the end that the glued sheet may be released from the gripper unit.

Suit-able bars 163, resting at one end onf'a grooved rod 164 carried by the frame members of the adhesive-applying unit and at their other end on a rod 165 secured to the conveyer frames 24 and 24a, serveV to support the sheet as it is transported from the unit G toward the unit C.

The synchronizing mechanism The unit C, and hence the unit W, may be synchronized with the unit G in any suitable manner. Preferably, however, this synchronizing arrangementy takes the form of that illustrated in our co-pending application, Serial No. 40,769, filed July 1, 1925, and as shown in Fig. 2 comprises a cam 170 carried by shaft 80, which rotates once, as thek wrapping machine 1V passes through one cycle of operation and rocks a lever 171 pivoted to the side frame .3a. A hook 172 carried by said lever is fastened to a rod, link or equivalent 173, extending to the tripping mechanism,.not shown, of the adhesive-applying unit. It is to be understood that cam -170 is so positioned on shaft 80 that the unit G will be successively actuated at proper times to eventually cause individual sheets to reach the wrapping machine W at the proper time for co-action with the form block structure comprised in said machine.

The operation is as follows:

Initially, a sheet of the desired size is placed in proper position on the lower form of the form block structure fw, whereupon the conveyer frames 24 and 24a are adjusted transversely of the machine until suction palms 50 andOa comprised respectively in the ends of tubes 48 and 48a are in position below the sheet at opposite advanced corners thereof, as shown in F ig. 6. This adjustment is effected by loosening the clamping bolts 21 which passes through the collar 20, Figs. 10 and 13, after which, rotation of shaft 18

shifts racks

28 and 28a either forward or backward, as found necessary, to likewise move the

reciprocatory suction tubes

30 and 30a. In .response to movement of reciprocatory suction tubes SOIand 80e tubes 48 and 48a are positioned as indicated above. Bolt 21 is now moved into clamping position. Adjustment of the

stationary suction tubes

37 and 37a is next effected by moving the supporting

guide members

36 and 36a; until the suction heads 53 comprised in said stationary tubes are in transverse alignment with the suction heads 52 comprised in the reciprocatory suction tubes. j

The same sheet or one identical therewith vforward edge of the sheet.

`is now placed in proper position -in the transversely aligned gripper units G1 carried by the chains 147 and 147@ whereupon movement of the chains is effected in the direction of the arrow, Fig. 1, until the bottom surface of the advanced edge of the sheet is well over the suction holes in the suction heads 53 comprised in the ends of the fixed

suction rods

37 and 37a nearest the adhesive applying unit G. Thereafter, fingers 139 and 139er, are moved into engagement with the advanced edge of the sheet and the set screws 138 and 138erl are clamped into engagement 'with Shanks 137 and 137e which, as stated above, are connected respectively 'to said fingers. As the iinal phase of this adjustment, cams 162 comprised in the bars 161 are adjusted by moving said bars in a proper direction until the cams are in such position that the transversely aligned gripper units G1 will be opened to release the sheets in the selected position as they are thereafter fed from the glued unit G.

The units G and W are now placed in operation, the latter functioning to operate the conveyer unit C through the oscillating arm 12. The feed of individual sheets from unit Gr is effected, however, at a predetermined period in the cycle 0f operation of the wrapping machine W and conveying unit C by the trip mechanism, described above.

When the unit G is tripped, a sheet is autof matically removed from stack a and passed through the various rolls to apply a coating of adhesive to a surface thereof, and passes from the gluing roll c toward a pair of now stationary grippers G1, whose arms 158 have been depressed by cams 160 to move the palms proper 156 from the wheels 157, Fig. 1. The forward edge of the ysheet passes into the grippers between said palms and the wheels 157, and immediately thereafter shaft 140 is rotated to actuate gear wheel 141 to effect movement of the lower spans of chains 147 and 147e toward the conveyer unit C. But slight movement is necessary to disengage arms 158 from cams 160, whereupon palms 156 move toward the wheels 157 and grip the Thereafter, the sheet is transported along the supporting rods 163 toward the conveyerunit C.

Cams 128 and 128e, respectively, are so positioned on shafts 126 and 1260., herein termed one time shafts, due to the fact that one, and only one, revolution thereof is effected as the Wrapping machine WY passes through one cycle of operation, that the high points thereof depress levers 134 and 1840i to move lingers 139 and 139e into the path of the advancing sheet prior to the time that arms 158 of the gripper units G1 respectively engage cams 162 to open said units to release the sheet whose forward edge engages fingers 139 and.139a, just as release is etz fected. The pair of gripper units G1 pass on without pause until another pair thereof are positioned in sheet-receiving position immediately adjacent the gluing roll c. At that time, rotation of shaft 14C automatically ceases, whereupon chains 147 and 147e assume a stationary position and so remain until another sheet has passed through the unit G into the pair of grippers last mentioned.

The sheet, upon release from the pair of grippers, as aforesaid, came to rest in a horizontal position on the ends of

stationary suction rods

37 and 37a. Just as release was eifected, the master valve V became eii'ective to place chamber 92 which is connected to the chambers in tubes 37 and 37al nearest the adhesive-applying unit in communication with suction chamber 88. As a result, the sheet is positively retained in engagement with the suction heads 53 comprised in the ends of said

tubes

37 and 37 a.

Thereafter, the high points of cams 128 and 128e pass on and fingers 139 and 139e are raised out of the path of the sheet, under the influence of the springs described above.

While the sheet remains in this position,

suction rods

30 and 30a under the influence oi reciprocatory racks 28 and 28a are move-d toward the unit Gr. While so moving` ho vever, chamber 94, which is connected to said suction rods, is in communication withl the atmosphere through its valve cylinder 104e. However, when suction rods 30 and 30o have been advanced to the full extent toward the unit G and while the suction heads 52 com` prised, in the ends of said rods are lying sideby-side, and in transverse; alignment with suction heads 53 comprised in the ends of fixed

rods

37 and 37a, the master valve V becomes effective to connect chamber 94 to suction chamber 88 and immediately thereafter exhaust chamber 92 to the atmosphere. Thereupon, reverse movement of

suction rods

30 and 30a from the unit G is instituted, the suction heads 52 comprised in the ends of said rods meanwhile retaining thesheet in engagement therewith and transportingr it toward the unit W.

When the master valve V functioned to connect chamber 94 to suction chamber 88 and to exhaust chamber 92 to the atmosphere, as described above, chamber 93, which is connected to the chambers in fixed

suction rods

37 and 37a removed from the unit G, was likewise exhausted to the atmosphere. Accordingly, the suction heads 52 comprised in the ends of

rods

30 and 30a, in advancing to the full extent toward the unit lV and assuming a side-by-side position in transverse alignment with the second set of suction heads 53 in fixed

rods

37 and 37 a, may freely move the sheet directly thereabove.

While said

rods

30 and 30a pause momentarily preparatory to again moving toward the unit G, the master valve V becomes effective to connect chamber 93 to suction chamber 88 and immediatelyy thereafter exhaust chamber 94 to the atmosphere. As a result, the sheet released from the

movable suction rods

30 and 39a and retained by the second set of suction heads .'73 in the fixed

rods

37 and 37a; the movable suction rods meanwhile returning toward the unit G for the next sheet, which is now in position on the suction heads 53 comprised in the ends of

rods

37 and 37a.

r In this manner and by successive stages, individual sheets are transported toward the wrapping unit W. the suction palms and 50o comprised in the ends of movable suction rods 30 and 30o positioning the individual sheets in the path of the form block structure of said unit just prior to the beginning of a cycle of operation thereof.

As described above, the actuating pulleys for the belts B, Bo and B1 are driven only While the movable suction rods are moving toward the unit W. As a result, there is provided a support for the sheets, movable, however, only when the sheets move. I

Inasmuch as it is desirable to effect a relatively higher velocity of sheet movement by the gripper units G1 than is effected by the suction rods. it is necessary to retain the sheet at its tirst station on the fixed

rods

37 and 37a for a longer period than atsubsequent slations. To this end, it is necessary to separate each fixed suction `rod into two chambers, es described above. Obviously.tlien,chamber 92 in the master valve controlling the chamlrcrs in the suction rods nearest unit G must be placed in communication with suction'chamber 88 somewhat earlier in each cycle of operation than are the other chambers in said rods. To this end, cam surface 82 on cam drum 8l controlling comn'iunication of

chainbers

88 and 92 may be positioned as desired to etlect this result at any desired time. This does not alter the fact that all chambers in the fixed suction rods should be released at the same time, namely, just

beforesuction rods

30 and 30a commence movement toward the unit lV.

Box structures of any desired character may be periodically fed beneath the form block structure of the 'wrapping machine by any suitable mechanism and in timed relation with said wrapping machine, each box structure arriving in position substantially coincidentally with the arrival of a sheet delivered by the mechanism hereinbefore described. Preterably, however, such boxstructure-delivering mechanism is of thecharacter described in our pending application Seria-l No. 40,769, filed July l, 1925, and is indicated gene-rally herein as comprising the box release structure S, Fig. '3, the box advancing belt S1, Figs. 2 and 3, and a box pusher bar S3, Fig. 3.

Although We have illustrated and described sheet-conveying mechanism comprising a pair of chains and associated gripping mechanism for transferring' sheets from the adhesive-applying unit G to the conveyerunit C in combination with a series of tubes in the last-mentioned unit wherein sheets are pneumatically gripped during travel towardthe wrapping unit lV, it shall be understood that. other types of conveying mechanisms may be utilized in said unit C, for example, of the character illustrated in our prior application Serial No. 40,769. filed July l, 1925.

What We claim is:

1. Sheet conveying mechanism con'iprising sheet-gripping mechanism for transporting sheets in succession to one region. and other sheet conveying mechanism timed therewith for effecting sheet delivery from said region to another region comprising structure for pneumatically retaining individual sheets in engagement therewith.v one ofsaid conveying mechanisms effecting sheet transportation at a higher velocity than does said other conveying mechanism.

In combination, sheet conveying mechanism comprising sheet gripping mechanism for transporting sheets coated With Wet adhesive in succession to one region, and other sheet conveying mechanism relatively movable with respect thereto in timed relation therewith and comprising pneumatic structure engaging the uncoated faces of individual sheets to retain them in engagement therewith during movement effecting transportation of sheets from said region to another region.

3. In combination, sheet conveying mechanism comprising sheet gripping mechanism for transporting sheets in succession to one region, and other sheet conveying mechanism comprising structure for pneumatically retaining individual sheets in engagement therewith effecting transport-ation of sheets from said region to another region, said conveying mechanism first mentioned effecting' sheet. transport-ation at a higher velocity than does said conveying mechanism second mentioned.

4. A conveyer unit comprising a pair of conveyer frames, means for conveying sheets in succession from a region at or adjacent one end of said unit toward the other end thereof, means carried by a conveyer frame for transporting sheets from a. region removed from said unit to said one end thereof and means to effect intermittent movement of said conveying and transporting means 1n timed relation to each other.

5. A conveyer unit comprising a pair of conveyer frames, means for conveying sheets in succession from a region at or adjacent one end of said unit toward the other end thereof, an endless conveyer carried by a conveyer frame for transporting sheets from a region removed from said unit to said one end thereof, and means to effect alternate, intermittent movement of said conveying means and endless conveyer 6. A conveyer unit comprising a pair of conveyer frames, means for conveying sheets in succession from a region at or adjacent one end of said unit toward the other end thereof, a flexible conveyer carried by a conveyer frame for transporting sheets from a. region removed from said unit to said one end thereof` and means to effect transfer of the sheet-s from the conveying means to said flexible conveyer While both are at rest.

7 A conveyer unit comprising a pair of conveyer frames, means intermittently movable to convey sheets in successi-on from a region at or adjacent one end of said unit toward the other end thereof, and an intermittently movable conveyer comprising sheet gripping mechanism carried by a conveyer frame for transporting sheets from a region removed from said unit to said one end thereof, and means effecting release of sheets from said gripping mechanism While said conveyers are stationary.

8. A conveyer unit comprising a pair of conveyer frames, means for conveying sheets in succession from a region at or adjacent one end of said unit tovvard the other end thereof, one of said conveyerl frames being-adjustable in a direct-ion at right angles to the path of' sheet movement, and means carried by a conveyer frame and adjustable therewith for transporting sheets fromv a region removed from said unit to said one end thereof.

9. A conveyer unit comprising a. pair of conveyer frames, means for conveying sheets in succession from a region at or adjacent one end of said unit towardl the other end thereof, one of said conveyer frames being adj ust-- able in a direct-ion at right angles to the path of sheet movement, and a flexible conveyer carried by a conveyer frame and adjustable therewith for transporting sheets from a region removed from said unit to said one end thereof.

10. A conveyor unit comprising a pair ol' conveyer `frames, means for conveying sheets in succession from a region at or adj acent' one end of said unit toward the other end thereof. one of said conveyer frames being adjustable in a direction at right angles to the path of sheet movement, and an endless conveyer carried by a conveyer frame and adjustable therewith for transporting sheets from a region removed from said unit to said one end thereof.

11. A conveyer unit comprising a pair of conveyer frames, means for conveying sheets inl succession from a region at or adjacent one end of said unit-toward the other end thereof, one of said conveyer frames being adjustable in a direction at right angles to the path of sheet movement, and a chain carried by a conveyer frame and adjustable therewith for transporting sheets from a region removed from said unit to said one end thereof. i

12. A conveyer unit comprising a pair of conveyer frames, means for conveying sheets in succession from a region at or adjacent one end of said unit toward the other end thereof, one of said conveyer frames being adjustable in a direction at right angles to the path ot sheet movement, and a conveyer comprising sheet gripping mechanism carried by a conveyer frame and adjustable therewith for transporting sheets from a region removed rom said unit to said one end thereoit.

13. Mechanism for conveying sheets coated with Wet adhesive comprising sheet transporting structure movable along a definite path, means for pneumatically retaining an uncoated surface of a sheet in engagement with said structure, means for releasing said sheet in a predetermined region, and means for temporarily retaining the sheet in said predetermined region.

14. Mechanism for conveying sheets coated with Wet adhesive comprising sheet transporting structure movable along a definite path, means for pneumatically retaining an uncoated surface of a sheet 1n engagement with said structure, means for releasing said sheet in a predetermined region, and pneumatic means engaging said uncoated surface to temporarily retain the sheet in said predetermined region.

15. Mechanism for conveying sheets coated with Wet adhesive comprising a station, pneumatic means acting upon the uncoated surface of a sheet for retaining the sheet at said station, and pneumatic means engaging the same surface of the sheet for removing the sheet from said station.

16. Mechanism for conveying sheets coated with Wet adhesive comprising a station, pneumatic means engaging an uncoated surface of a sheet for delivering the sheet to said station. and means engaging the uncoated surface for retaining the sheet at said station.

17. Mechanism for conveying sheets coated With Wet adhesive comprising a station, pneumatic means engaging an uncoated surface of a sheet for delivering the sheet to said station, and pneumatic means engaging the uncoated surface for retaining the sheet at said station.

18. Mechanism for conveying sheets coated with Wet adhesive comprising a station, pneumatic means engaging an uncoated surface of a sheet for delivering the sheet to said station, means engaging the uncoated surface for retaining the sheet at said station, and valve structure controlling said means.

19. Sheet conveying mechanism comprising a` plurality of stations, pneumatic means for retaining a sheet at one station, pneumatic means for removing the sheet from said station to another station, pneumatic means for retaining the sheet at said Second-mentioned station, and valve structure controlling said means.

20. Sheet conveying mechanism comprising a reciprocatory tube, a stationary tube, a plurality of suction heads comprised in said stationary tube, and means for producing a partial vacuum in said stationary tube during movement. of said reciprocatory tube in one direction.

21. Sheet conveying mechanism comprising a reciprocatory tube, a stationary tube, a plurality of suction heads comprised in said stationary tube, means for producing a partia-l vacuum in said stationary tube during movement of said reciprocatory tube in one direction, and means for opening said stationary tube to the atmosphere as said reciprocatory tube moves in reverse direction. y 22.. Sheet conveying mechanism, comprising a tube having adjacent chambers, means for producing a partial vacuum in one of said chambers, means for subsequently producing a partial vacuum in another of said chambers, and means for opening said chambers to the atmosphere at substantially the same time.

23. In a conveying unit, a sheet transport'- ing member, mechanism supporting sheets during transportation by said member, means for reciprocating said member, and means for operating said mechanism.

24. In a conveying unit, a sheet transporting member, mechanism supporting sheets during transportation by said member, means for reciprocating said member, and means for operating said mechanism only during movement ot' said member in one direction.

In a conveying unit', a sheet transporting member, belt supporting sheets during transportation by said member, means for reciprocating said member, and means for moving said belt.

26. In a conveying unit, a sheet transporting member. belt supporting sheets during transportation by said member, means for reciprocating said member, and means for moving said belt only during movement o said member in one direction.

27. In a conveying unit, a sheet transporting member, means for reciprocating said member, means for retaining a sheet in engagement with said member during movement thereof in one direction, a belt supporting a sheet in engagement with said member, and means for moving said belt only during movement of said member in one direction.

28. In a conveying unit, a sheet transporting member, means for reciprocating said member, means for pneumatically retaining a sheet in engagement with said member during movement thereof in one direction, a sheetsupporting belt, and means for moving said belt only during movement of said member in one direction.

29. Sheet conveying mechanism comprising a row of spaced stations, asheet transporting member extending substantially parallel with a line passing through said stations, a plurality of sheet retaining devices carried by said member, each in lateral alignment with a station, means for reciprocating said member to advance each retaining device into lateral alignment with the next adjacent station and then back to original position, means for retaining a sheet by each retaining device during movement of said member in one direction, and means for retaining the sheets at said stations during movement of said member in reverse direction.

30. Sheet conveying mechanism comprising a row of spaced stations, a sheet transporting member extending substantially parallel with a line passing through said stations, a plurality of sheetretaining devices carried by said member, each in lateral alignment with a station, means for reciprocating said member to advance each retaining device into lateral alignment with the next adjacent station and then back to original position, means for pneumatically retaining a sheet by each retaining device during movement of said member' in one direction, and means for pneumatically retaining the sheets at said stations during movement of said member in reverse direction.

3l. Sheet conveying mechanism comprising a stationary tube, a plurality of spaced suction heads comprised in said tubes, each,

suction head comprising a sheet retaining station, a sheet transporting tube extending substantially parallel with a line passing through said stations, a plurality of suction heads carried by said sheet transporting tube, each in lateral alignment with a stat-ion, means for reciprocating said sheet transporting tube to advance each suction head carried thereby into lateral alignment with the next adjacent station andthen back to original position, means for jineumatically retaining a sheet by each suction head c arried by said sheet transporting tube during movement thereof in one direction, and means for pneumatically retaining the sheets at Said stations during movement of said sheet transporting tube in reverse direction.

32. Sheet conveying mechanism comprising a stationary tube, a plurality of 4spaced Suction heads comprising a stationary tube, a plurality of spaced suction heads comprised in said tube, a second suction tube reciprocatory along a line parallel with a line Apassing through said suction heads. and means for adjusting said stationary tube in a d1- rect-ion parallel with said second-mentioned tube.

33. Sheet conveying mechanism comprising a normally stationary suction member, a

direction of movement of said reciprocating member. A j

35. Sheet conveying mechanism comprising a normally stationary suction member, a reciprocating suction member, means simultaneously to adjust said members transversely of the direction of movement of said 'reciprocating member, and means to adjust either or both of said members in the direcion of movement of said reciprocating mem- 36. Mechanism for conveying wrapper sheets into the path of movement of formblockst-ructure operating in timed relation therewith comprising a member movable into and out of the path of movement of said form-block, means adjustable to determine the forward limit of travel of said member,

and pneumatic means to retain a wrapper sheet in engagement with said member during forward movement thereof.

` 37. Mechanism for conveying wrapper sheets into the path of movement of form block structure comprising conveyer frames adjustable toward and away from each other, members carried thereby movable in timed relation to said form-block structure intoto retain a wrapper sleet in engagement with said members during their forward movement.

39. Mechanism for conveying wrapper sheets into the path of movement of formblock structure comprising conveyer frames adjustable toward and away from each other,

normally stationary suction members carriedthereby, suction members carried thereby reciprocable in a pat-h intersecting the path of movement of and in timed relation to said form-block structure, and means to determine the forward limit of travel of said reciprocating members.

THEODORE A. FEDERVVITZ.

WALTER T. BAILEY.

CERTIFICATE or coRREcrtoN.

Patent No. 1,804,406. y Granted May 12, 1931, w

THEoDoRE A. EEDERwrTz ET AL.

lt is hereby certifiedv that error appears in the printed specification of the above numbered patent requiring correction as follows: Page l, line 98, for the misspelled word "loking" read looking; page 7, line 48, for "bolts" read bolt; page l1, lines 55 and 56, claim 32, strike out the words and comma "a plurality of spaced suction heads comprising a stationery tube, and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 7th day of July, A. D. 1931.

M. J. Moore, (Seal) Acting Commissioner of Patents.