US1417117A - Cutting machine - Google Patents

Description

A. W. TYLER.

CUTTING MACHINE. APPLICATION FILED NOV-15,1919- W IW;

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CUTTING MACHINE, APPLICATION FILED Nov. 15. 1919.

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A. W. TYLER. CUTTING MACHINE.

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CUTTING MACHINE.

APPLICATION FILED NOV-15,1919

MHWJ WW Patented May 23 1922..

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G'UTTING- AIME.

To all whom it mag concern:

Be it known. that I, ALVA' W. TYLER, a

' citizen of the United States,'and a resident.

of Chicago, in the countyof Cook and State of Illinois, have invented. certain new and useful Improvements in Cutting Machines;

' and I do hereby declare that theiollowing is a full, clear, and exact description thereof,

reference "being had to the accompanying drawings, and to the letters of reference thereon, which" form apart of this specification.

This invention relates to improvements in cutting machines, and consists of the matters hereinafter described and'more particu-' larly pointed .out in the appended claims.

The object-of the invention is to provide an efficient, automatic machine, which will cut or sever a continuous, moving strip or web, into predetermined lengths. The several advantages of the invention will more fully appear as I proceed with my specification.

The invention is herein illustrated ttnd described as embodied in a machine more particularly adapted-for use in operatingnpon a continuous strip or web of plaster board,

comprising top and bottom 'coverings or fibrous material and ,an intermediate plaster body adhered thereto. In the drawings:

Fig.1 illustrates a view in side elevation,

of a cutting machine embodying my. invention.

Fig. 2 illustrates a topplan view thereof.

Fig. 3 illustrates a transverse vertical sec-'- tional view through the cutting machine, the plane of the section being'indicated by the line 33 of Fig. 1. 4.

Fig. 4. illustrates on an enlarged scale, the valve actuating mechanism shown in Fig. 3.

Fig. 5 illustrates a'detail, transverse vertical sectional view through the valve mechanism and piston, the plane of the section being indicated'by the line 5+5 of Fig. 2 V

Fig. 6 illustrates a longitudinal vertical detail sectional view through the inlet valve mechanism, the plane of the section being indicated by the line 6-6 of Fig. 5.

Fig. 7 illustrates a longitudinal vertical detail sectiona'l'view through the power cylinder, the plane of the section being indicated by the line 7-- 7 of'Fig. 5. r Fig. 8 illustrates a; perspective. view of Specification of Letters Patent. jpwl mgdl M 3 mm? application filed. November 15, 1919. terial'lto. 336,190. I

one of the valve actuating stems and will be more speclfically'reiferred to later."

Fig. 9illustrates a transverse, vertical seca longitudinal vertical detail sectional view through apart of the cutting machine, the plane of the section'being indicated by the 11ne 10-10 of Fig.2.- i

F1g. 11 ,illustratesa vertical detail sectionalv vlew through a part of the machine, the plane of the sectionbeing indicated by line 11-11 of Fig. 4.

. Fig. .12 illustrates another-vertical detailsectional view through a part of the machine, the plane of the section being indicated by the line 1212 of Fig. 2.

. Fig. :13 illustrates a lon itudinal,.vertical sectional vlew, the plane 0 the section'being indicated by the line 13-13 of Fig. 3;

Figs. 14-15 .and 16 illustrate horizonal detail sectional views, the planes ofthe various sections being indicated respectively by the lines l4l-14, 15 15,' and 16-16 of Fig. 3. I

Fig. 17 illustrates a longitudinal vertical detai' cated by the line 17-47 of Fig. 4.

plaster board and the knives of the machine:

showing the relative position of the knives before and after cutting the plaster board.

Referring now in detail tp that embodiment of the 'inventionillustrated in the accompanying drawings, 20-20 indicate upright transversely spaced columns, which are rigidly connected at their ends by top and sectional view through parts of the .machine,,-the plane of the section being indibottom bridge heads 21and 22 respectively.

Mounted at their ends in said columns are top and bottom cutter bars 23 and 24, which move vertically, towards and away from each other. At the middle of said columns, are'outwardly extending, vertically spaced lugs. or ears 25, arranged in pairs,' each pair receiving between them, longitudinally extea tending channel beams26, said ears and the top and bottom flanges of-said beams being bolted together. Said beams which are of a suitable length, have afiixed to their'ends,

extensions 27 in the term of edgewise arranged flat bars, which are movably supby upright bracket standards 29, fixed to longitudinal stringers 30. 31 and 32 re-,

spectively indicate cylinders fixed on associated shafts 31 and 32 which are journalled in bearing blocks 31 and 32 ,-0n the stringers 30. Trained about each cylinder is an associated conveyor belt 33 and 34 respectively, the top laps of which are arranged in a plane between the'cutter bars and movably support the plaster board 35 to be operated upon.

Each cutter bar has vertical end ribs 23 and 24 respectively, which have sliding guidedbearing in vertical grooves 20 -20, formed in the inner surfaces of the columns 20 (see Figs. 3, 14 and 16) and near said ends are provided sockets 36, 37. in which are arranged heavy expansion coiled springs 38, that engage on opposite faces of abutments or rests 39, attached to the columns 20, between the lugs or ears, 25 thereon.

In the top and bottom opposed edges of the cutter bars are longitudinal, grooves 4040, in which knives 41.-41 are held by bolts 42 (see Fig. 13) said knives-having V-ishaped cutting edges.

The bottom cutter bar 24, is provided near its end with short, horizontal 'stub shafts 43, on which are pivotally mounted ears or lugs 44, in which are secured the bottom ends of upright connecting rods 45. The top ends of said rods are also fixed in cross lugs or ears 46. arranged between the top cutter bar 23 and bridge-head 21, which cross lugs are pivoted on studs 47, on the outer ends of rocking levers 48. Said levers 48, which are arranged in the vertical plane of the cutter bars, are pivoted near their outer ends, to rock in a vertical plane. between ears 49, depending from the bottom su'rface of the top bridge-head 21. The inner ends of said rocking levers are pivotally connected to each other and to the bottom end of a connecting rod 50, by a pin 51. The top end of said connecting rod is connected by a wrist pin 52 (see Fig. 5) to a single acting piston 53, operating in a vertically disposed cylinder 54, which opens downward through the bottom of thebridge-head 21 at' its middle. Interposed between the rockinglevers 48 and the top cutter bar 23. are antifriction devices 55 which are seated in recesses provided therefor in the top surface of the cutter bar and on the bottom surface of'the bridge-head 21 on each side of the cylinder 54 are provided yielding bumpers 56. against which said levers engage in the return to their normal position,

It is apparent that when the piston 53 moves downwardly on its power stroke, it

will depress'the inner ends of the levers 48' to move the top cutter bar 23 downwardlyand the bottom cutter bar 24 upwardly by reason of the mechanism ust described, both against the action of the springs 38, which returns all parts to their normal positions after the power stroke of the piston has been completed.

In the bridge-head 21 are provided two longitudinal extending, horizontal valve chests 60 and 61, arranged on opposite sides of the cylinder 54. The valve chest 60, contains the inlet valve for the pneumatic operating fluid, preferably steam, to the cylinder 54, while the valve chest 61 contains the exhaust valve for said cylinder. An inlet port 62, which opens through the top of the bridge head 21, connects the valve chest 60 with a pipe 62, for the operating fluid, said pipe being connected in a suitable manner with a source of supply. A cross port 63, which connects both valve chests together, opens intothe top end of the cylinder 54, and connected with'the valve chest 61 is an exhaust chamber 64, to which connects an exhaust pipe 65, which leads to a suitable place of disposal for the exhaust operating fluid.

In each valve chest is a tubular valve the ends of said. bushing being closed by front and rear cover plates, 68 and 69 respectively, which are bolted on opposite sides of the bridge head 21. Each valve bushinghas a plurality of longitudinally arranged annularly spaced ports 66 and 67 respectiv'ely, which open into the cross port 63 and each valve bushing also has an enlarged, longitudinally arranged. port 66 and 67", whichopen into the inlet port 62 and exhaust port 64 respectively. In each valve bushing is rotatively mounted an oscillatable tubular valve plug 73 and 74, having front and rear end walls 75 and an intermediate wall 75, said end walls engaging the plates 68, 69 before referred to. In the peripheral part of said valve lugs are provided a plurality of longitu in'ally arranged, spaced vanes or ribs 7 6. which normally close off the ports 6667 in the valve bushings 66 and 67. Diametricallyopposite the vanes 76, is a web 77, which connects the end and intermediate walls of the valve plug to strengthen the same as a whole, the space between said web and ribs on the one hand also providing an opening which register with the inlet and exhaust openings 66 and 67" respectively. of the valve bushings. In the rear end wall 75 of each valve plug. is a transverse groove 80, in which is arranged the crossbar 81 of a cylindrical valve stem' 82 (see Figs. 6 and 7) Said stems project through openings in the plate; 69 and their outer ends are journalled in bearings carried at the ends of bracket extensions 83- on said plate 69. stuffing box 84 is provided about that part of each valve stem where it extends through the said plate 69. A plate '85 connects the bearing sleeves at the outer ends of the brackets 83 together, said plate havingannular end. flan es which are bolted-to said bearings.

eyed torthe-outer end of-leach valve stem are lever arms 86 and 87 respectlvely, whlch extend towards the adjacent outer ends of I the bridge head 21. (See Figs. 3 and 7). A

contractlle coiled spring 88, which is eon-1 nected at its ends to the arm 86 and to a j bracket 89 extending'rearwardly" from the bridge head, normally holds the arm 86 against a stop 90 carried by the outer end of that bracket 83 of the plate 69, in which. the outer end of the associated valve stem'has bearing. The other arm 87, which'is likewise .connected by a "spring 88 to a similar bracket 89, has an extension 87 which engages beneath a shoulder 91, on the upright arm of a bell crank trip lever 92, which is 'pivoted ona rearwardly extending lug carried by plate 85. A spring .93, interposed between a fixed part of said plate and said upright arm of the bell crank'lever 92, normally holds the said armin. lockin'g position Withrespect to the extension 87 F'xed atits ends to'the bridge head 21, and bracket 89, respectively, is a strap 94,

and pivoted at their middles, on saidstrap,

in the plane of the arm 86, are fingers 95 and 96 respectively. The outer end of the finger 95 is connected by .a universal joint to an upright, re/ciprocable, actuating rod 97,

while the inner end of 'said finger'rests. .in-

engagement upon the outer end of the finger 96. The inner end of said finger 96 en-- gages beneath the outerend of the "arm 86. t. is apparent that when an u ward ,move

' ment is imparted to the rod 9 an upward movement will. be imparted. to the end of the arm 86 against the action of, the spring bymeans of the fingers 95 and 96;

, To actuate the bell crank tripping lever 92, to release the extension 87 a of arm 87, provide the followin 1 The end of the horizontal arm of the bell crank tripping lever 92, is bifurcated and throughit extends a rod 100, on'the top end ofwhich are threaded nuts .101, providing an adjustable shoulder thereon (see Fig. 17). The bottom end of the rod is suitably connected withv the 'rear end of a. lever 102, which is pivoted between-its ends to-a strap 103, depending from the plate 85 before mentioned. The other, ,or front end, of this lever, has a pin and slot connection with the rearend of, a second lever 104:, which is ,lever extends into the 10 1 and 102, produce a similar movement of ,the rod 100, when the nuts 101. will engage the bifurcated end of the horizontal arm of the bell crank tripping lever 92, and cause it to withdraw its shoulder 91 from engagement with the extension 87 of the arm 87 The spring 88 will then swing the arm 87 downwardly until it engages a stop arm 90 carried by that bracket 83 associated with the arm 87. To return the arm 87 to its normal position wherein its extension 87* is engaged beneath the shoulder 91 of the trippin lever 92, I provide the following K, mechanism: 110 indicates an IL shaped lever which is-pivoted at 111 on the rear face of web of the bridge head 21, to swing in a vertical plane, parallel to the longitudinal median line of the machine as a whole (see Fig.11).'- The free upright end of said path of the lever 87 and to said lever 110 is pivoted, the top end of a link 112, the bottom end of which is.

connected to the lever 48, associated'with the exhaust valve mechanism. As the long arm of said lever 48, swings upwardly in its return movement the link 112 will impart a like movement to the member 110, which in turn will swing the outer end of the lever 87 upwardly. This W111 cause the short arm 87 thereof to move downwardly, its inclined end surface engaging the top end of the arm 91 of the trip lever and moving the same so as to engage beneath the shoulder of said arm.

As before mentioned, the supporting chan-' nel, bars are movably mounted-with respect tothe standards 29 and movement is imparted first in the direction of the travel of the material being operated upon, so that said material is cut by the knives as it moves with the supporting belts 23 -24: and then in areverse directlon back to the normal position. Thls movement of the support- 1 ing channels together with the columns 20,

and bridge heads 21-22 is at the same rate of travel as that of materialbe'ing operated upon. This forward and return movement isprovided for by the following mechanism:

On one end of the shaft 31, without one of the stringers 30, is fixed a large spur gear 116, which meshes with a smaller spur gear 117,- secured to a cross shaft 118. This shaft 118, is mounted in bearing blocks 119, which are longitudinally. adjustable on the stringers 30 toward and away fromthe cylinder shaft- 31. able on brackets on said stringers, the

1120 As shown, said blocks are slidadjustment being made by .set screws 121 carried b ,said ackets and engaging the bearing b ock. lFixedto said shaft 118, near the gear 117, on the opposite side of the meshes with a spur gear 123, loosely mounted on a sleeve 124:, carried by the shaft 31, said gear having a long tooth 125. Rotatstringer 30, is a segmental gear-122, which shaft 118.

able with the gear 124 is a cam 126 upon the periphery of which engages a roller 127, carried on the. bottom end of the rod 97 before mentioned, said bottom end of said rod having a sliding bearing in a guide 128 on the top end of the web 129 of the associated bearing block 31".

. Also fixed to said shaft 128, diametrically opposite the segment and within the plane of the stringers 30,- are radial arms 132, which carry inwardly extending pins 133. Said pins in the swing of said arms, engage the ends of associated horizontal arms 134, fixed to ashaft 135 journalled in bearings 136 on the stringers 30,-to the rear ofthe Fixed to the extreme ends of the shaft 135 are upright arms 137, arranged in the plane of channels 26. The top ends of said arms are connected by links 138 to ears 139 fixed to the bottom of the channels 26. Contractible springs 140 are interposed between the upright arms 137 and upright bars 141 attached to the stringers 30, to return the arms 137 to their normal position, stop lugs 142, on the inner faces of the stringers engaging the arms 13-1 an limiting the rearward swing of the arms 13 The material operated on in this instance is the plaster board 35, said board comprising top and bottom coverings of paper 35 with an intermediate plaster body 35" adhered thereto. This board is made in a continuous strip and is supported on and is moved ,by the belts 33-31, through the space between the cutter bars 23-24. To provide a support for the plaster board in the vicinity of the cutter bars. I provide transversely extending rollers 145 which are journalled at their ends in the channels 26-26.

The operation of my improved cuttingmachine is as follows: The belt 33 carrying the plaster board 35. is driven in any suitable manner and as it passes about the cylinder 31, it rotates the same together with its shaft 31". The plaster board passes over the rollers 145 and between thecutter bars and thence onto the belt 34, which delivers the cut pieces or sections to a suitable place of disposal. As the shaft 31 is thus rotated, the gear 116 thereon will drive the gear 117 and thus rotate the shaft 118. Said gears 116, 117 bear to each other, the same relation that the circumference of the belt cylinder 31 bears to the length of the sections to be cut and therefore by adjusting the shaft 118 towards or away from the shaft 31 and by substituting thereafter for the gear 117, another ear which meshes with the gear 116, the re ation between said gears may be changed at will to either increase or decrease the length of the section to be out. As the shaft 118 is driven in the direction of the arrows shown in Fig. 10, the advance end of the segment 122 will engage the finger 125 on the gear 123 to start said gear which will mesh with the gear segment and be driven thereby. Said gear and segment have the same number of teeth so that in every complete rotation of the shaft 118, the gear 123 has been once rotated. The cam 126 will rotate with the gear 123 and its projection will elevate or raise the rod 97.

Said rod will rock the arms 95 and 96 on the strap 94 and swing the outer end of valve arm 86 upwardly against the action of the spring 88. This rocks the valve stem 82 and with it the inlet valve plug 73, when the spaces between the vanes 76 of said plug, will register with the ports 66 of the valve sleeve 66. Steam under pressure which fills the interior of the valve plug will pass into the piston cylinder 54 and move the piston downwardly. the exhaust valve remaining closed. The downward movement of the piston. through the connecting rod 50 will depress the inner ends of the levers 48, and raise the outer ends thereof about the hearing pins in ears 4t). and as the said inner ends engage the top cutter bar 23 through the anti-friction devices 55, and as the outer ends of said levers 48 are connected to the bottom cutter bar 24, said cutter bars will move toward each other on their cutting stroke, compressing the springs 38 between said cutter bars and the abutments 39. As the piston 53 reaches the limit of its power stroke. the rod 100 will through its connection with the levers 4-8. move the horizontal arm of the bell crank tripping lever 92 downwardly. when the vertical arm thereof will swing away from the short arm 87 of the lever 87 and thus release the same. The spring 88 associated with the arm 87 will act through said arm to rock the valve stem connected to the exhaust valve 74, until said arm engages the stop arm 90. As the valve plug is thus rotated, the spaces between its vanes will register with ports in the sleeve 67 when the steam will pass through said ports and into the exhaust chamber 64. in the bridge head and then out through the exhaust pipe connected therewith. The pressure on the piston is thus released and the springs 38 will expand to their normal position; moving the cutter bars back into their normal position.

As the cutter bars thus return to the position ready for the next operation, they will through the levers 48 and other connections before described, move the piston 53 upwardly and into its normal position. As the levers thus move, the outer end of the member 110, which is connected to one of said levers 48 by the link 112, will engage the outer end of the arm 87, and move it back into a position where its end '87 will once. more engage'beneath andbe locked by the shoulder 91 on the bell crank tripping lever.

- dais-air? f course after the roller 127 on the rod 97 leaves the projection on cam 126, the spring 88 will returnthe arm 86 to its normal position against the stop 90, when the inlet valve will again be closed. 3 Simultaneously with the swlng or rotation .of the gear segment 122, the arms 132 on the shafts. 118 will also receive their swing or rotation. At a predetermined time in said swing of the arms 132, the pins 133 thereon,

' will engage the ends of the levers 1.34 on the shaft 135 and produce a rocking movement thereof. This will swing the upright arms cut; As-soon as the pins 133 137 on said shaft against the action of the springs 140. As said arms are connected to the channels 26 by, the links 138 a-nd'ears 139 as before described, a forward movement is impartedto the channel 26' and the parts mounted thereon, at a speed equal to that of the movement of the plaster board 35 being pass the arms 134:, the springs 140 will tend to move the channel bars back to their normal position,

. which is reached'when the arms 134 engage -25 their associated stop lugs.

The parts are so timed that the cutting mechanism proper on the channels is actuated as the forward movement of the channels begins, the out having been made before the forward limit of movement of the channels has been reached, the parts of the cutting mechanism proper returning to their normal position as sald channels are returning to their normal position. Thus the plaster board is out while it is moving, so that there is no buckling of the board nor any stoppage of the same.- As the knives of the cutting bar have V shaped edges which do not touch each other in the cutting operation, they will cut through the paper coverings and tend to bend the cut edges toward each other as shown in "Fig. 19, thus partially binding the cut edge of the board and promachine tecting the plaster body from breakage in the handling to which the sections-are naturally subjected.

ltt is apparent that my improved cutting plaster board while it is moving and cuts it from the opposite surfaces thereof, and at the same time produces a cut finished edge wherein .parts of the paper coverings are bent towards each other to partly bind the board.

The cutter bars having V shaped edges cannot up by the adhesion of the plaster material forming the body or core of the board. Furthermore, I am enabled to use a pneumatic fluid as an operating medium and this ermits of a quick positive cutting stroke of t e cutter bars.

The machine ma be quickly changed to cut sections of di erent length, simply .be

substituting one ar for another.

While in describing my invention, l have as many advantages :l[t cuts the referred to certain detail'of mechanical construction and arrangement of parts,][do not wish to be limited thereto except as may be pointed out in the appended claims.

, I claim as my invention:

' 1. In a machine for cutting lengths from a continuously fed strip, a horizontally recip-rocable frame, a cutter bar vertically movable in said frame, a member carried by said frame and co-acting with said cutter bar, a fluid actuating member carried by said cutter frame and connected with said cutter bar to move the same towards its 00- acting member, means for reciprocating said frame at predeterminedintervals, controlling means for said fluid member, and

means operable in the forward movement of said frame for actuating said controlling means. v

2. Ina machine for cutting lengths from a continuouslyfed strip, a horizontally reciprocable frame, a pair of co-acting cutter bars vertically movablein said frame towards and away from each other, a' fluid actuating member carried. by said cutter frame and operative-1y connected to said cutter bars, means for reciprocating said frame 'at .predetermined intervals, control- 7 ling means for said fluid member, and means operable in the forward movement of said frame for actuating said controlling means.

3. In a machine for cutting lengths from a continuously fed strip, a horizontally reciprocable frame, a pair of .co-acting cutter barswertically movable in said frame towards and away from each other, levers operatively connected at their outer ends to said cutter bars, a cylinder and a piston therein carried by said frame, said piston being operatively connected to saidlevers, means for reciprocating said frame at predetermined intervals, devices providing for adjustment of the length of said intervals, inlet and exhaust valves for said cylinder to and from said cylinder,and means operable in the forward movement of said frame for actuating said valves.

4. ][n a machine for cutting lengths from a continuously fed strip, a horizontally reciprocable frame, a pairof co-acting cutter bars vertically movable in said frame tollll wards and away fromeach other, levers oplttl bars vertically movable in said plane towards and away from each other, yielding me hers interposed between fixed parts of saig frame and the ends of said cutter bars,

s a" cylinder having inlet and exhaust valves for reciprocating said frame at predetermined intervals, and means operable in the forward movement of said frame for actuating said valves.

6. In a machine of the class described, a cutter frame, a pair of co-acting cutter bars vertically movable insaid frame towards and away from each other, yielding members interposed between the ends of said cutter bars and fixedparts of said frame, connecting rods at the ends of said cutter bars, said connecting rods being pivotally attached at their lower ends to the ends of the bottom cutter bar, levers movable in the vertical plane of said cutter hars and fulcrumed to the frame above the same, said levers being pivotally attached at their outer ends to the top ends of said connecting rods and having their inner ends pivotally connected to each other, means interposed between said levers and said top cutter bars, whereby the same is depressed with said levers as they operate to lift the lower cutter bar, and means for depressing the inner ends of said levers.

7. In a machine of the class described, a cutter frame, a pair of co-acting cutter bars vertically movable in said frame tow'ards and away from each other, yielding members interposed between the ends of said cutter bars and fixed parts of said frame, connecting rods at the ends of said cutter bars, said connecting rods being pivotally attached at their lower ends to the ends of the bottom cutter bar, levers movable in the vertical plane of said cutter bars and fulcrumed to the frame above the same, said levers being pivotally attached at their outer ends to the top ends of said connecting rods and having their inner ends pivotally connected to each other, antifriction abutments 'on said top cutting bar engaged by said levers, said abutments being1 each spaced a distance inward from the fulcrum of its lever equal to the distance said fulcrum is from the pivotal connection of the associated connecting rod, and a fluid controlled pis ton operatively connected with the inner ends of said levers.

8. In a cutting machine of the kind described, the combination of supporting stringers, a shaft journalled on said stringers, a conveyor belt drum fixed to said shaft. a gear on said shaft, a second shaft journalled on said stringers and adjustable toward and away from said drum shaft, a gear removably fixed to said second shaft and meshing with the gear on the first shaft, a rock shaft, journalled on said stringers, horizontal and upright arms fixed to said rock shaft, means connecting the upright arms to said frame and radial arms on said second shaft adapted to engage said horizontal arms in the rotation of said second shaft.

9. In a machine for cutting lengths from a continuously fed strip, a horizontally reciprocable frame, a cutter bar vertically movable in said frame, a member carried by said frame and coacting with said cutter bar, a motor carried by said frame for actuating said cutter bar to more the same towards its coacting member, means for reciprocating said frame at predetermined intervals, controlling means for said motor, and means operable in the forward movement of said frame for actuating said controllin means.

10. n a machine for cutting lengths from a continuously fed strip, a horizontally reciprocable frame, a pair of coacting cutter bars vertically movable in said frame towards and away from each other, a motor carried by said frame for actuating said cutter bars, means for reciprocating said frame at predetermined intervals, controlling means for said motor, and means operable in the forward movement of said frame for actuating said controlling means.

11. In a machine of the class described, a cutter frame, top and bottom coacting cutter bars vertically movable in said frame towards and away from .each other, levers fulcrumed to the frame above said cutter bars and movable in the vertical plane thereof, rods pivotally attached to the bottom cutter bar and to the outer ends of said levers, means interposed between the'inner ends of said levers and the top cutter bar to depress said top cutter bar in one movement of said levers, means for depressing the inner ends of said levers, and expansive devices interposed between the ends,-of said cutters bars and a fixed part of said frame, which are compressed as said cutter bars move toward each other and which thereafter expand to move said cutter bars away from each other.

12. In a cutting machine of the kind described, the combination of supportin stringers, a shaft journaled on sai stringers, a conveyor belt drum and a gear fixed on said shaft, a frame-reciprocably mounted on said stringers, a cutting mechanism carried by said frame, a controlling device for said cutting mechanism, a second shaft mounted on said stringers, a gear on said second shaft, meshing with the gear on said drum shaft, the circumferences of the said gears bearing the same relation to stringers, a shaft journaled on said stringers,

a conveyor belt drum and a gear fixed on said shaft, a frame reciprocably mounted on said stringers, a cutting mechanism carried by said frame, a controlling device for said cutting mechanism, a second shaft mounted on said stringers, a gear on said second shaft, meshing with the gear on said drum shaft, the circumferences of the said gears bearing the same relation to each other as the length ,of the section to, be cut bears to the circumference of said drum, means for adjusting said second mentioned shaft and for changing the gear thereon, to change the relation between the circumferences of said gears, and means operated in the rotation of said second shaft for actuating said controlling means.

1 1. In a cutting machine of the kind described, the combination of supporting stringers, horizontally spaced drums, mounted on said stringers, conveyor belts for the web to be cut, there being one belt associated with each drum, upright standards carried by said stringers, supporting members reciprocable in said standards, a cutting mechanism mounted on said supporting members between said drums, a controlling mechanism for said cutting mechanism, and means operated in timed relation with one of said drums, for reciprocating said frame and for actuating said controlling mechanism at predetermined intervals.

15. In a cutting machine of the kind described, the combination of supporting stringers, horizontally spaced drums, mounted on saidstringers, conveyor belts for the web to be cut, there being one belt associated with each drum, ,upright standards carried by said stringers, supporting members reciprocable in said standards, a cutting mechanism mounted on said'supporting members between said drums, a controlling mechanism for said'cutting mechanism, and means operated in timed relation with one of said drums for reciprocating said frame and for actuating said controlling mechanism at predetermined intervals, said lastmentioned means being capable of being ad justed to change the periods between said intervals.

16. In a cutting machine, the combination of reciprocable supporting members, upright columns carried by said supporting members, bridge pieces connecting the top and bottom ends of said columns} cutter bars mounted in said columns and vertically movable towards and away from each other, a motor carried by one of said bridge pieces, and means connecting said cutter bars to said motor.

In testimony that I claim the foregoing as my invention, I affix my signature in the presence of two witnesses, this 31 day of October, A. D. 1919.

ALVA W. TYLER.

Witnesses:

T. H. ALFREDS, EDITH A. BREEZE.

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