US1978157A - Machine for creasing sheet material - Google Patents

Description

Oct. 23, 1934. H. B. GREENWOOD MACHINE FOR CREASING SHEET MATERIAL 7 Sheets-Sheet l N NARN U NM N 2-51m@ 06 I l I 2 vw k Nm mwN l? \MN fd 1 Il G T N 4% \\\V "mi UT! u n m mwa* ,\T%MWN\\\ NQ m.%\ \m um Q QM. m iy A k. KN NVQ m m H. B. GRENWOOD MACHINE FOR CREASING SHEET MATERIAL Filed June 5, 1933 '7 Smets-sheet 2 Oct. 23, 1934. H B, GREENWOOD MACHINE vFOR CREASING SHEET MATERIAL Filed June 5, 1933 7 sheets-sheet 3 OC- 23, 1934- H. B. GREENWOOD MACHINE FOR CREASING SHEET MATERIAL Filed June 5, 1933` 7 Sheets-Sheet 4 Oct. 23, `1934. H. B. GREENWOOD MACHINE FOR CREASING SHEET MATERIAL Filed June 5, 1933 '7 Sheets-Sheet 5 f5.5. {@l if? Oct. 23, 1934. HA. B. GREENWOOD '1,978,157

MACHINE FOR CREASING SHEET MATERIAL Y Filed June5, 1955 7 Sheets-Sheet 6 Oct. 23, 1934. H. B. GREENWOOD V MACHINE FOR CREASING SHEET MATERIAL Filed June 5, 195s 7 sheets-Sheet 7 LMV MINHMW #MEW n uw..

HHH .ILM

Patented Oct. 23, 1934 PATENT OFFICE N l 1,978,157 4 MACHINE Foa CREASING SHEET MATERIAL Henry B. Greenwood, Glenarm, Md.

` Application June 5, 1933, Serial No. 674,450

10 Claims. y

"This invention relates to a mechanism for creasing box blanks and'particularly blanks made of fibre board, which is dense and difficult to crease by the use of creasing wheels. This mech- --"5 anism is one `unit of a combined machine for slotting, creasing and `printing box blanks, the slotting and printing units being omitted from the drawings.

In accordance with the present invention, the blanks tobe creased `are carried in a horizontal `path through the central part of themachine, by aA suitable conveyer, between upper land lower pairs of creasing bars which `are mounted on rocker arms projecting from upper and lower pairs of rock shafts. Theserock shafts are rocked in unison, causing the creaser barsto move alternately forward with the conveyer and then back- -ward.` During the forward movements the creaser bars engage and crease the blanks and during the backward movements Athe upper rock shafts and the rocker arms and creaser bars carriedthereby are lifted `so that the bars cannot engage the blanks. .Thecreasing pressure is applied to the blanks principally through the weight of the parts `associatedwith the upperrock shafts. The machine `embodies means for supporting the rocker arms laterally and guiding their free ends so that the upperand lower creaser bars will register accurately,V 4and it includes various necessary adjusting devices for adjusting the guides for the blanks and the rocker arms and creaser bars laterally to suit blanks of different widths, and means for adjusting the conveyer to correctly position the blanks with respect to the creaser bars.

In -the accompanying drawings, Fig. '1 is a side elevation of the creasing machine; V

` Fig. 2` isl an end elevation of the same, looking from right to left in Fig. 1, parts of the mech- `anism being omitted and parts broken away, and the "frame being in section on the line 2 2 of Fig. 1; i

Fig. 3 isa vertical section on the line 3--3 of Figs. Zand 4, the guides for the sheet material being omitted;'

Fig. 4 is a horizontal section about on the line 4 4 of Fig. 3; Fig. 4a shows a detail of one of the guides for the sheet material; 5 isa` detail View showing the creaser bars and operating mechanism in side elevation, `the bars "beinglin creasing position;

`Fig."6` isl asimilar view Showing the creaser bars'in`theirv forwardpositions;

isa detailview showing one ofthe bar creaser rockeriarms and rits4 support; i

Fig. 1.

. Fig.` 8 is aside elevation of the same, looking from left to right in Fig. 7;

Fig. 9 is atop plan view of the central part of the machine, the cross-beams being removed and indicated in dotted lines, showing the means foi" 6 adjusting. the upper creaser bars laterally, and,

Fig. i0 is a section on the line 10-10 of Fig. i showing the means for adjusting the feed chain to the movements of thecreaser bars.

Referring to the drawings, 1 indicates the base of the machine, upon which are mounted parallel side frames 2 and 3, suitably connected together at various points as by the end bars 4 and 5 and cross-piece 511, Fig. 3. A drive shaft 6, Figs. l and 3, is mounted in suitable bearings in the 70 lower part of the side frames `near the delivery end of the machine, and this shaft is operated by a shaft '7, Fig. 4, extending from the slotting and printing units (not shown) and connected to the shaft 6 through bevel gears 3 and 9. The blanks 75 which are to be operated Aupon are carried through the machine by an endless conveyer chain 10 the upper stretch 10a of which passes horizontally through the machine midway between the side frames. This chain is operated from the drive shaft 6, as hereinafter explained. Above the` shaft 6 are two shafts 11 and 12one directly above the other and both extending transversely through the'machine, and on these lattershafts are inter-meshinggears 13 and 14, respectively, of the same diameter, as shown in Similar inter-meshing 'gears are arranged onthe opposite ends of these shafts, one `of these, 13a corresponding to. the gear i3, being shown in Fig. 4. As shown in Fig. l, the shafts lland 12 are driven by a gear 6a on lthe driving shaft 6 which meshes with an idle gear l5, which, in turn, meshes with the gear 13. It will be understood `that the mechanism at one side of the machine for operating the creaser bars, as illustrated in Fig. 1, is duplicated on the opposite side of the machine.

Referring to Fig. l, the gear 13, has an eccentric pin 16 which is connected by a link 17 to a pin 18 at the upper end of a lever 19 which `is secured to a rock shaft 20 journaled inthe lower part of the machine. The corresponding link and lever atthe opposite side of the machine are shown at ,17a and 19a, respectively, in Figs. 2 and 4. Two rocker arms a. and b,.Figs. 2, 3 and 4, are keyed to the shaft 20 and project upwardly from the shaft. The rocker arm a is connected byfa creaserjbar 2l` to asimilar arm a' keyed to a rock shaft 22 which isjournaled in the lower part ofthe frame Aparallel with the shaft 20.A Therocker armfb,

which is parallel to the arm a, is connected by a creaser bar 23 to a rocker arm b', keyed to the shaft 22 and extending upwardly parallel with the arm a', as shown in Figs. 2 and 4.

It will be evident from this description that as the gears 13-13a rotate, the shaft 20 will be rocked and the rocker arms a and b thereon will move the creaser bars 2l and 23 back and forth, the latter causing the rocker arms a and b and the shaft 22 to rock.

The gear 14 on the shaft 12 (and the corresponding gear, not shown, on the opposite end of the shaft), through links 24 and 24Et (Figs. 1, 2 and 9) actuate parallel levers 25 and 25a which are keyed to and depend from a rock shaft 26, mounted in vertically movable bearings 27 and 27a, directly over the shaft 20. These bearings are connected to a cross-beam g, as hereinafter described. The shaft 28 carries two depending rocker arms c and d, and creaser bars 28 and 29, respectively, connect the lower ends of these arms with corresponding arms c and d on a shaft 30 which is mounted in vertically movable bearings 3l and 31a secured to the ends of a cross-beam h. The shaft 30 is directly over the shaft 22. The rocker arms on the several shafts are all alike and are set so that the upper creaser bars Will always be opposite to and parallel with the lower creaser bars and, by reason of the gearing and connections described, all of the bars will move endwise back and forth in unison.

Each of the rock shafts 20, 22, 26 and 30 is provided with a long key-way 32 and each rocker arm hasa key entering the key-way in the shaft on which the arm is mounted. Each pair of rocker arms a-a, b-bh c-c and 1 -d', and its connecting creaser bar, is adjustable longitudinally of the rock shafts independently of the other pairs and their connecting creaser bars. Each rocker arm is guided in its rocking movements and supported laterally by a support which is movable longitudinally of the shaft on which the arm is mounted. These supports are all alike and are connected in pairs. Thus, supports 7c and lc', connected by a cross-piece 33, are shown adjacent the lower rocker arms o and a', respectively, and supports k2 and k3 connected by a cross-piece 34, are shown adjacent the lower arms b--b, respectively. Similarly, supports 164 and 7c5, connected by a cross-piece 35, are arranged adjacent the upper rocker arms c and c', respectively, and supports k6 and k7 (Figs. 2 and 9), connected by a cross-piece 36, are arranged adjacent the upper rocker arms d and d, respectively.

Each arm support, as shown best in Figs. 7 and 3, comprises an oblong casting having near one end a bearing 37 through which a rock shaft extends, and having laterally projecting shoulders 38 at said end. The opposite end of the casting is arcuate in form, as shown at 39, and to this end is bolted an arcuate guide plate 40 which projects beyond said end. This arcuate guide fits into a groove on the adjacent arm formed by a flat bearing surface 41 on the arm and a plate 42 which is bolted to a projection 43 on the arm and engages the front face of the arcuate guide plate. lThe shoulders 38 are extended beyond the body of the support on opposite sides of the hub of the adjacent rocker arm, and the extensions are connected by a cross-piece 38b (Figs. 7 and 9) these parts serving to connect the upper end of the arm to the support, but leaving the arm free to rock.

As shown in Fig. 3, channeled guides m are arranged transversely of the machine beneath the rock shafts 20 and 22 and the ends of the supports 7c and k having the shoulders 38 t in these channels and metal strips 44, secured to the sides of the channels and projecting over the shoulders, hold the supports against rocking movement. The supports adjacent the rocker arms b and b are similarly arranged in these channels. The supports for the rocker arms on the upper rocker shafts 26 and 30 have their shoulders 38 fitting Within channels n extending longitudinally on the under side of the cross-beams g and h and metal strips 45, secured to the sides of the channels, project under the shoulders and prevent rocking movement of the supports.

As shown in Figs. 1, 3 and 9, the supports lc4 and k5, the rocker arms c and c and creaser bar 28, are adjustable as a unit along the upper rock shaft by means of two parallel adjusting shafts 46 and 47, the former journaled in lugs 48 projecting from the bearings 27 and 27a and the latter journaled in similar lugs 49 projecting from the bearings 31 and 31a. These shafts are connected to turn in unison by a sprocket chain 50 engaging sprocket wheels on the shafts. One of the shafts, 46, has an angular end 46a to which a wrench may be applied to turn the shaft. The shafts 46 and 47 have threaded portions extending through threaded openings in blocks 51 and 51a, respectively, secured to the cross-piece 35 which connects the supports h4 and R5, and they have plain portions which extend through openings in blocks 52 and 52a on the cross-piece 36 which connects the supports k6 and k7. It will be evident that by applying a wrench to the shaft 46 and turning the same, the shafts 46 and 47 Will operate, through the threaded engagements with the blocks, to move the supports R4 and k5 and the rocker arms c and c simultaneously along the rock shafts to adjust the creaser bar 28 toward and from the central line of the machine.

For adjusting the supports k6 and k7 and the rocker arms d-d and creaser bar 29, a pair of shafts 53 and 54 are mounted in the lugs 48 and 49, and these are connected by a sprocket chain 55. The shaft 53 has a threaded portion which engages a threaded opening in the block 52 and a plain portion which passes through an opening in the block 51, and the shaft 54 has a threaded portion engaging a threaded opening in the block 52a and a plain portion which extends through an opening in the block 51a. By applying a wrench to the angular end 54a of the shaft 54 and turning the same, it will be evident that this shaft and the shaft 53 will turn in unison and cause the supports k6, k7, rockers d and d and the creaser bar 29 to move toward or from the central line of the machine, according to the direction in which the adjusting shafts are turned.

The lower supports, rocker arms and creaser bars, are laterally adjustable in the same manner as the upper members. Thus, adjusting shafts 56 and 57, journaled in the sides of the frame and connected by sprocket chain 58, have threaded portions which engage threaded openings in blocks 59 on the under side of the cross-piece 33 which connects the supports k, lc', and parallel shafts 60 and 61, connected by a sprocket chain 62, have threaded portions engaging threaded openings in blocks 63 on the under side of the cross-piece connecting the supports k2 and k3.

Parallel guide bars p and q, for supporting the bre blanks as they pass through the machine, are arranged at opposite sides of the conveyer chain and creaser bars, and these guide bars are adjustable toward and from one another, to suit `blanks of different widths, as hereinafter described.

The bearings 27 and 27a for the upper rock shaft 26 and thebearings 31 and 3la for the rock shaft 30 are mounted so as to be vertically movable, in order that the upper creaser bars, which are supported by these shafts, may be moved away from the lower creaser bars `after a blank has been soY ` is suspended from a pivot pin 77 in an ear 78 increased and while the bars are moving rearwardly. The bearings and supporting devices are the same at each end of each shaft. As shown in Figs. 1 and 2,1 the bearing 27 is mounted upon two parallel rodsl and 66l which are movable vertically in guide openings 67 and 68, respectively, in the frame. AThe upper end portions of the rods, which extend through the bearing, are of reduced diameter, to provide shoulders upon which the bearing rests, and these reduced portions extend through the end of the cross-beam g and nuts 69, threaded onto the rods, secure the bearing to the cross-beam. The lower end portions of the rods: are of reduced diameter and a cross-head`70 is slidably mounted on these lower portions. This cross-head is normally heldagainst the shoulders i 65a and 66a on the rods by compression springs 71 arrangedbetween the cross-head and adjusting nuts 72 threaded onto the lower ends of the rods. A pair of links 73 and 74, pivotallyconnected to the cross-head by a pivotpin 75 connectthecrosshead with the lower end of a short link 76 which the lower part of the frame. The. axes of the: pivot pins 75 and 77 and vof the shaft 26 arein the same Vertical line. The short link thus supports the links 73 and 74, the crosshead, the guide rods guide posts being shown at 65.

The devices for supporting the bearings for the shaft 30, and also the cross-'beam h, which is mounted on said bearings, are thesaine in all respects as the devices for supporting the shaft 26and` the cross-beam g. In Fig;` l, links 7Gb and 73h correspond in structure and function Ywith thelinks 76 and 73 and the cross-head 701 corre sponds with the cross-head 70. `In Fig. 4, links 73h, 74h, 74C and 73c correspond with links 73,

"'14, 74s` and 73e, respectively. and in Fig. 3, links 76h, and 74c correspond with links 76a and 74a, respectively, and cross-head 70C corresponds with cross-head 70a.'

Referring to Figs. l, 2, 4 and 5, the pivot pin/1.80, which connects the lower ends cf the links 73 and 76, also connects these links with one endI of a horizontal bar 81 and the pivot pin 62, which connects the4 lower ends of the links 76 and` 7.31L

also connects the latter linkswith said bar near the opposite end thereof. A bell crank lever 83,

ipivoted at 84 to the side of the frame, has one endpivotally connected to said bar at 85, and a` roller 86 on the opposite end of the lever rests against an eccentric 87 which is secured to andturns with the shaft4 11. These parts are duplicated at the opposite side of the machine, as`

shown in Figs. 2, 3.,.and 4, the horizontalv rod being shown at 81e, the bell crank lever at 83e,

the roller at 86*ab and the eccentric at` 87a. f

The movements of the creaser` bars while the machine is. in operation are as follows: Assum-` ing the shafts 11 and 12 to be turning in the directions indicated by the arrows in Figs. 1 and 3, when the links 17 and 24 which operate the rock shafts are in the position shown in said figures, the creaser bars will be approximately in the position shown in Fig. 3 andthe eccentrics on the shaft 11 will be in the position shown in these figures. During the nexthalf revolution of the Shaftsfthe rocker arms will swing forward in the direction of movement of the feed chain and as they move forward the low parts of the cams are engaged by the rollers," as shown in` Fig. 5, and thel creaser bars, traveling horizontally at the same speed as the feed chain will be in the position shown in Fig. 5 at the end of the first quarter of a revolution of the shafts l1 and 12. In this position, the creaser bars will apply heavy pressure to the sheet material and crease the same. During the second quarter of a revolution, the creaser bars will swing to the left of the position shown in Fig. 5 into the positions shown in Fig. 6, and the eccentrics will move the bell crank levers to swing theY bars 81 and 8la to the left," as indicated in Fig. 6, and as this will cause the short links 76 and 76a` to swing out of the vertical line, the horizontal bar 81 'will be raised `and this will cause the links 73 and 73b to lift the cross-heads and the rock shafts which carry the creaser bars, as well as the beams g and h, so that the upper bars will be lifted out of engagementwi-th the sheet material. During the `next half revolution of the shafts, the roller will will cause theupper creaser bars to be supported.

above the plane of the sheet material while they are travelling back to their right-hand positions, and until the `bars again start to move forward, when the cams will allow the upper bars to approach the lower bars and crease the material, as before. The weight of the parts which are raised and lowered by the operation of the cams is sufficient to crease the sheet material.

The feed chain 10 which carries the box blanks through the machine has lugs 10b attached to it at suitable distances apart for engaging the rear ends of the box blanks and moving them through the machine along the guide rails p and q. It is.

necessary toY adjust the feed chain so that the lugs will bring the blanks successively into position to be engaged by the creaser bars when the latter are brought to the creasing position. The feed chain extends overa sprocket wheel 90, journaled in bearings 91 on a bracket r which is secured to the cross-piece 4` at the delivery end of the machine, Figs. `1, 3 and 4, and from this sprocket the chain extends downwardly around a sprocket wheel 92 at the lower end of the bracket and thence rearwardly under an idle sprocket 116 in the lower part ofthe machine. The spreeke`t92 is mounted upon a shaft 93. Fig. 1'0, and has a tapering hub 92a which 'ts into a flaring socket in the hub 94a of a sprocket 94 which is keyed to `said shaft. A friction clutch is thus formed by the hubs of the two sprocket wheels. 'I'he sprocket 94 is connected by a drive chain 95 to a sprocket wheel 96 onl the drive shaft 6. The sprocket` 92 yhas a sleeve 921J which extends through the bearing 97" and a hand wheel 98 is secured to this sleeve. The shaft 93 has a. re-

duced part'93e which extends beyond the hand wheel and this part is threaded to receive anut 99.. A collar 100 is arranged between the nut andthe end of the sleevev 92h. When' the hut per tightened theshaft and the sleeve are pressed in opposite directions, causing the clutch members on the sprocket hubs to engage tightly. When it isdesired to adjust the feed chain with respect to the drive chain, the nut 99 is loosened and the sprocket 92 which operates the feed chain can then be disengaged from the sprocket 94 and turned, carrying with it the endless feed chain to adjust the chain so that the lugs b thereon will position the box blanks correctly with respect to the creaser bar movements.

The guide bars p and q which support the box blanks at their edges while the blanks are being moved through the machine by the feed chain are arranged in opposite sides of the chain and are adjustable toward and from one another to suit blanks of different widths. The guide bar p, as shown in Figs, Z, 4 and4a, comprises a fiat metal strip 101 having bearing blocks 102 secured to its under side at its ends and having on its upper side a longitudinally extending angle bar 103 which forms a rail to guide the box blanks at one edge. As shown in Fig. 4a, each bearing block has parallel openings 104 and 105, to receive a of adjusting shafts, one opening being threaded, and the other plain.` The threaded portions of shafts 106 extend through the threaded openings and the plain portions of shafts 107 extend through the plain openings. These shafts are journaled in the side frames of the machine. The shafts 106 are vconnected by sprocket chains 108 to sprocket wheels on a shaft 109 on which is mounted a hand wheel 110. By turning the hand wheel the guide bar p may be 'j moved toward or from the guide bar q.

The guide bar q has bearing blocks at its ends, the same as the bearing blocks beneath the guide bar p, except that the openings through which the shafts 106 extend are plain while the openvings through which the shafts 107 extend are threaded to engage threaded portions of the latter shafts. The shafts 10'7 are connected by sprocket chains 111 to sprocket wheels on a shaft 112 which is provided with a hand wheel 113. By

turning this hand wheel the shafts 107 will be turned and cause adjustment of the guide bar qtoward or from the guide bar p; On the upper side of the guide bar q a series of springs 114 is arranged so as to yield laterally and apply a yieldving pressure'to the edges of the box lblanks in order-to keep them inv contact with the rail 103 on they opposite guide bar p.' Each spring is secured to the guide bar q by a suitable fastening device 115, and from these devices the springs incline rearwardly and toward the opposing guide bar, as shown.

From the foregoing description it will be plain that the guide bars are adjustable to suit different'widths of box blanks and that the creaser bars are also adjustable to effectcreasing on blanks of different widths and at different positions with respect to the sides of the blanks.

What I claim is:

l. A machine for creasing sheet material comprising side frames, means for moving the material longitudinally through the machine, upper andlower pairs of shafts extending transversely of the machine, cross-beams extending longitudinally over said upper shafts and having bearings at their ends in which said upper shafts are mounted, guides secured to the ends of the crossbeams and vertically movable in the side frames, a pair of rocker-arms depending from each upper shaft, a pair of upstanding rocker-arms on each lower shaft,A creaser bars, each pivotally connected to arms on a pair of said shafts, the arms on one upper shaft and one lower shaft being secured to the shaft to rock therewith, means for rocking the arms in unison to cause the creaser bars to move alternately forward with the sheet material and then backward, and means for raising said guides at the end of each forward movement and for lowering the guides at the end of each backward movement of the creaser bars.

2. A machine for creasing sheet material cornprising side frames, means for moving the material longitudinally Ithrough the machine, upper and lower pairs of shafts extending transversely of the machine, a pair of rocker-arms depending from each upper shaft, a pair of upstanding rocker-arms on each lower shaft, creaser bars each pivotally connected to rocker-arms on a pair of said shafts, cross-beams adjacent said upper shafts and having bearings at their ends in which said upper shafts are mounted, guides secured to the ends of the cross-beams and vertically movable, means for supporting the guides comprising a relatively long link depending from each guide and a short link connected to the long link and pivoted to the frame above the point of connection between the links, means for rocking all of the arms in unison to cause the creaser bars to move alternately forward with the sheet material and then backward, and means for rocking said links to cause an upward movement of the guides at the end of each forward movement of the creaser bars and a downward movement of the guides at the end of each rearward movement of the creaser bars.

3. A machine for creasing sheet material comprising side frames, means for moving the material longitudinally through the machine, upper and lower pairs of shafts extending transversely of the machine, a pair of rocker-arms depending from each upper shaft, a pair of upstanding rocker-arms on each lower shaft, creaser bars each pivotally connected to rocker-arms on a pair of said shafts, cross-beams adjacent said upper shafts and having bearings at their ends in which said upper shafts are mounted, guides secured to the ends of the cross-beams and vertically movable, means for supporting the guides, comprising a relatively long link depending from each guide and a short link connected to the long link and pivoted to the frame above the point of connection between the links, horizontal bars, each connectedto the links at one side of the machine, gearing for rocking the arms in unison to cause the creaser bars to move alternately forward with the sheet material and then backward, and means for moving said horizontal bars to cause an upward movement of the guides at the end of each forward movement of the creaser bars and a downward movement of the guides at the end of each rearward movement of the creaser bars.

4. A machine for creasing sheet material comprising side frames, means for moving the material longitudinally through the machine, upper and lower pairs of shafts extending transversely of the machine, a pair of rocker-arms depending from each upper shaft, a pair of upstanding rocker-arms on each lower shaft, creaser bars each pivotally connected to rocker-arms on a pair of said shafts, cross-beams adjacent said upper shafts and having bearings at their ends in which said upper shafts are mounted, guides secured to the ends of the cross-beams and vertically movable, cross-heads slidable on the guides and supporting the same, springs intercross-heads comprising a relatively long link depending from each cross-head and a short link connected to the long link and pivoted to the frame above the point of connection between the links, means for rocking all of the arms in unison to cause the creaser bars to move alternately forward with the sheet material and then backward, and means for rocking said links Yto cause an upward movement of the guides at the end of each forward movement of the creaser bars and a downward movement of the guides at the end of each rearward movement of the creaser bars.

5. In a machine for creasing sheet material,

rmeans for moving the material longitudinally .thesupports 6. In a machine for creasing sheet material, means for moving the material longitudinally through the machine, upper and lower pairs of rock-shafts extending transversely of the machine, two rocker-arms keyed to and slidable upon each shaft, creaser bars each pivotally connected to arms on a pair of said shafts, means for rocking said shafts in unison, supports journaled on the rock-shafts at the sides of the arms,

each support having a sliding connection with the adjacent arm near thefree end of the latter,

and means for preventing rocking movement of the supports, comprising cross-beams extending parallel `with the shafts and having guide-ways engaged by said supports.

7. Ina machine for creasing sheet material,

' means for moving the material longitudinally through the machine, upper and lower pairs `of rock-shafts extending `transversely of the machine, two rocker-arms keyed to and slidable upon each shaft, creaserbars each pivotally connected to arms on a pair of said shafts, means for rocking said shafts in unison, supports journaled on the rock-shaftsat the sides of the arms, each support having a sliding connection with the adjacent arm and being rigidly connected to a support on the opposing shaft of a pair, means for adjusting each connected pair of supports longitudinally of the shafts independently of the other connected pairs of supports and means for preventing rocking movement of the supports.

8. In a machine for creasing sheet material, means for moving the material longitudinally through the machine, upper and lower pairs of rock-shafts extending transversely of the machine, two rocker-arms keyed to and slidable upon each shaft, creaser bars each pivotally connected to arms on a pair of said shafts, means for rocking said shafts in unison, supports journaled on the rock-shafts at the sides of the arms each arm having a guide-way at one side near its free end and the adjacent support having a guide plate engaging said guide-way, and means forpreventing rocking movement of the supports.

9. A machine for creasing sheet material comprising means for moving the material horizontally through the machine, upper and lower pairs of shafts extending transversely of the machine, a pair of rocker arms depending from each upper shaft, a pair of upstanding rocker arms on each lower shaft, creaser bars each pivotally connected to rocker arms on a pair of said shafts, means for rocking the arms in unison to cause the creaser bars to move alternately forward with the sheet material and then backward, and means for lifting said upper shafts at the end of each forward movement and for lowering them at the end of each backward movement of the bars.

l0. A machine for creasing sheet material comprising means for moving the material horizontally through the machine, upper and lower pairs of shafts extending transversely of the machine, a pair of rocker arms depending from each upper shaft, a pair of upstanding rocker arms on each lower shaft, creaser bars each pivotally connected to arms on a pair of said shafts, means for rocking the arms in unison to cause the creaser bars to move alternately forward with the sheet material and then backward, comprising a lever depending from one of the upper shafts, a lever projecting upwardly from one of the lower shafts, a pair of intermeshing gears, links connected to the free ends of said levers and eccentrically connected to said gears, and means for lifting the upper shafts at the end of each forward movement and for lowering them at the end of each backward movement of the bars.

HENRY B. GREENWOOD.

los

Images