US2775953A

US2775953A - Improved mounting means for glue spreading rollers

Info

Publication number: US2775953A
Application number: US293405A
Authority: US
Inventors: Joe B Mcfall
Original assignee: Individual
Current assignee: Individual
Priority date: 1952-06-13
Filing date: 1952-06-13
Publication date: 1957-01-01
Anticipated expiration: 1974-01-01

Description

J. B. M FALL Jan. 1, 1957 IMPROVED MOUNTING MEANS FOR GLUE SPREADING ROLLERS Filed June 13, 1952 4 Sheets-Sheet l INVENTOR. J05 5. M FALL Jan. 1, 1957 J McFALL 2,775,953

IMPROVED MOUNTING MEANS FOR GLUE SPREADING ROLLERS Filed June 13, 1952 4 Sheets-Sheet 2 INVENTOR. JOE 5. M i/4A L BY .972 v agf J. B. M FALL Jan. 1, 1957 IMPROVED MOUNTING MEANS FOR GLUE SPREADING ROLLERS 4 Sheets-Sheet 3 Filed June 13, 1952 INVENTOR. U05 5. MFA

ZMMW

J. B. MOF'ALL Jan. 1, 1957 IMPROVED MOUNTING MEANS FOR GLUE SPREADING ROLLERS 4 Sheets-Sheet 4 Filed June 13, 1952 INVENTOR J05 5. M 5444 United States Patent=*-C J IMPROVED MOUNTING MEANS FOR GLUE SPREADING ROLLERS Joe B. McFall, Seattle, Wash.

Application June 13, 1952, Serial No. 293,405

17 Claims. (Cl. 118-227) This invention relates generally to glue spreading machines and more particularly to novel structure therein which provides great advantages in the adjustment and removal of the rolls thereof.

In the conventional arrangement for the adjustment of the rolls in glue spreading machines, screw adjustment means of more or less simple construction are provided. Such screw adjustment means are inherently prone to go out of adjustment while the spreader is in operation. This results in either glue waste when the roller spaclng increases or, less frequently, in insuificient glue on the veneer, board or other element to which glue is being applied when the roller spacing decreases. Similarly, there may be inequalities of spread where one or the other of a pair of screw adjustment means, as usually provided, goes out of adjustment.

In addition to the above defect in screw adjustmen means that they tend to goout of adjustment due to the mere vibration of the machinery or for other mechanical reasons, there is still another inherent defect in such means due to the fact that there may be a certain amount of play in the screw threads per se. Since the criticahty of adjustment may be of the order of thousandths of an inch, the aforesaid play in the threads may be enough to seriously impair the adjustment. On the other hand, while the play referred to may be of an'order to throw out the adjustment, the over all non-resiliency of such screw thread arrangements risks injury to -the spreader rolls upon encountering an inordinate thickness as caused, for example, by a thicker veneer or a double piece of core. In addition, in the presently known arrangement, the screw adjustment means, because of their relationship to the glue rolls with which they are operatively associated, continually become fouled by glue from the said rolls.

Furthermore, in the presently known arrangements in glue Spreaders, a single driving motor is provided'for rotating the spreader rolls as well as the doctor rolls by means of gear trains mechanically linking the various rolls. Accordingly, mounting any given one of the rolls for replacement or repair entails a comparatively difficult operation. i

In view of the foregoing, it is the general object of the present invention to provide novel adjustment means which may be set manually with great accuracy at all times and which will retain such setting during operation of the glue spreader until further manual re-setting by the operator. 1

It. is another important object of the present invention to provide novel adjustment means which will assurethe avoidance of play found in the usual screw and nut adjustment arrangements.

It is still another important object of the invention to" provide adjustment means which will keep set 'indefinitely and not go out of adjustment due to vibration or other causes. i

It is yet another object of the invention to provide a 2,775,953 7 Patented Jan. 1, 1957 chosen, yet permits lateral movement of the rolls under or other parts is avoided.

A further object of the invention is to provide adjustment means based on gas pressure operation.

Another object of the invention is to provide an arrangement whereby the adjustment means per so will not be subject to fouling by the glue handled by the rolls of the spreader.

Yet another object of the invention is to provide means for permitting facile removal of the rolls as well as adjustment thereof.

The foregoing as well as additional objects and features of the present invention will be readily apparent from the description of one preferred embodiment thereof given hereinafter with particular reference to the accompanying drawings wherein:

Figure 1 is a front elevation of a glue spreader having the novel adjustment means and driving means of the present invention;

Fig. 1a is a view taken from the right side of Fig. 1

with the cover removed showing certain chain driving mechanisms.

Flgure 2 is a vertical cross-sectional view of the spreader shown in Figure 1, the section being taken on line H-II thereof;

Figure 3 is an enlarged cross-sectional view of one of the doctor bar adjustment cylinders, the section being taken along the axis thereof as indicated by line IIlIlI in Figure 1;

M Figure 4 is an enlarged cross-sectional View of one of the spreader roll adjustment cylinders, the section being taken along the axis thereof as indicated by line IV-IV in Figure 1;

. Figure 5 is an enlarged elevational view of a bearing and mounting structure for one of the doctor rolls with -parts broken away to show some of the details; and

Figure 6 is a diagrammatic representation of the lateral movements possible for one of the spreader rolls and both the doctor rolls, as well as a glue hopper associated with one of the latter.

Referring now to the drawings, wherein like reference numerals designate the same parts throughout the several views, a pair of I-beam elements 41 arranged in parallel relationship function as the base for the glue spreader apparatus. Mounted on the base elements 41 in spaced apart relationship are a pair of upright panel 30 are providde on

shafts

127 and 129 structure which, while keeping the

prppenadjustment members

75 and 76 upon which the bulk of the glue spreader structure is mounted as described hereinafter. A pair of lower hollow rods 71 and a single upper hollow rod 72, each attached at the ends thereof to said

panel members

75 and 76, respectively, complete the main framework of the spreader device. have an additional function which will now appear from the following description.

Mounted upon thepair of rods 71 are a pair of supporting brackets which in turn support a lower glue hopper 31. Supported to extend within the confines of this glue hopper by means later to be described are the lower glue spreader roll 29 and the doctor roll 27 operatively associated therewith. The

shafts

127 and 129 for the two

rolls

27 and 29, respectively, extend through the side walls of the glue hopper 31. In the case of shaft 127, however, elongate slots 130, best seen in Fig. 2, are provided in the walls of the hopper 31 to permit the lateral movement of the shaft later to be described. Seal rings to prevent glue from spilling from the hopper 31 via the apertures in the hopper wall through which said shafts extend. Such prevention has particular importance in the case of elongate slots 130. The ends of the

shafts

127 and 129 are rotatably supported in roller bearings43mountedin blocks 143 slidably The pair of rods 71 mou be we oppos d pairs of L=shaned brackets 144 by means of cooperating tongue 145 and groove elements 145' provided on said brackets and blocks, respectively. Obviously, the tongue and groove arrangement may be reversed with the former element on the block 143. and the latter on the bracket 144, if desired. Brackets, 144 are secured to the

respective panel members

75 and 76 by bolts 151 or the like.

An end of the shaft 127 for the doctor roll 27 extends through an aperture 146 in the panel 76 and has mounted on the protruding end thereof a sprocket 3.3. Aperture 146 is preferably in the form of an elongate slot similar to slot 130 and for the same purpose of permitting lateral shifting of shaft 127. On the other hand, the shaft 129. for the glue spreader roll 29 is supported in a similarbearing (not shown). mounted on brackets 147 (one of which is shown in Fig. 2) which are fixedly secured to. the panel 75. Shaft 129 likewise extends through panel 75 via an aperture (not shown). Mounted upon the extending end of the shaft 129 are flexible couplings 39 which connect this end of the. shaft to. the end of a shaft 132 mounting a sprocket 37. While it is not contemplated that shaft 129 have any lateral movement, the presence of the couplings 39 provide for some leeway in aligning shaft 129 with the shaft 132 which is like.- wise laterally unshiftable due to the presence. of a flange bearing 153..

The upper glue spreader. roll 28. and the doctor roll 26 associated therewith are mounted in a manner similar to that just described. Specifically, the shaft 126 for roll 26 is rotatably supported in a pair of bearings (not shown) similar in structure to hearing 43 and each sim-. ilarly mounted on one of the

panels

75 and 76, respec= tively, for lateral movement by means of blocks 143: and brackets 144 having cooperating tongue and groove elements 145 and 145'. A sprocket 33 is mounted on the end of the shaft 126 protruding through an aperture (not shown) in, the wall of upper glue hopper 32 and an aperture (not shown) in the panel 76 similar to aperture 146 in panel 75. The shaft 128 for the spreader roll 28, similarly mounted at its ends by bearings 43' mounted in blocks 148, extends at one end thereof through a vertically elongate aperture (not shown) in the panel 75 and is coupled by means of flexible couplings 39 to a shaft 154 on which is mounted for rotation therewith a gear 38. In this case the couplings 39 are necessary to accomrnodate the lateral displacement of shaft 128; to the extent of approximately 2 inches. Gear 38 on the upper spreader roll shaft meshes with a similar gear 38' mounted on the shaft 152 which is connected by the flexible coupling 39' to shaft 129 of the lower spreader roll 29 as alreadydescribed. The driving means for the spreader rolls 28: and 29 comprises a sprocket chain 134 running gver sprocket 37 and a second sprocket 137 mounted on a shaft 138. Shaft 1-38 is driven via. a three speed drive gear box 177 and a reduction gearing assembly 136' by a motor 36. An operator handle 77 permits selection of one of three speeds delivered by the three speed drive gear box 177 depending upon the operation desired. That is to say, the amount of glue applied to the glue rolls 28 and 2 9- and hence to. a sheet of veneer W passing there,- between may be grossly adjusted step-wise by altering the relative speed of rotation between the glue rolls 28 and 29. and theirrespective doctor rolls 26 and 27, While the fine adjustment is accomplished by manipulation of the novel adjustment means of the present invention described hereinafter. Furthermore, different speeds may be required depending upon the characteristics of the. veneers being glued such as its brittleness, for example,

Similar but separate means for driving the doctor. rolls 26 and 27 are provided on the other side of the framework. Specifically, instead of intermeshing

gears

38 and 38 as described for shafts 128; and 129, a sprocket chain 133,, connects the two

sprockets

33 and 33"mountedon P Q I ding ends of; the doctor roll, shafts IZG-and 127,-

respectively. A second sprocket chain 134 connects a second sprocket 34 mounted on the shaft 127 for the lower doctor roll 27, with still another sprocket 137 mounted on the shaft 139 of a reduction gearing assembly 135 driven by a second motor 35. In this case, it is not necessary to have flexible couplings between the

shafts

126 and 127 and their respective sprockets 33 and 33' since the displacement between the said shafts, and their respective sprockets thereon is accommodated by the fact that

spring tighteners

133 and 133", provided for chain 133, take up slack therein and permits stretching thereof, Similarly, a spring tightener 141 in chain 134' allows for relative displacement between sprockets 34 and 137'. The spring tighteners as is conventional may each comprise a sprocket carried by a shaft mounting which is spring biased to urge the sprocket against its respective chain drive to keep the same resiliently taut in all normal and displaced positions of the

sprockets

33, 33 and 34.

Adjustment means for the laterally movable doctor rolls 26 and 27 and the laterally movable upper glue spreader roll 28; which are particular features of the present invention will now be described. Each of the afore-. said rolls 26, 27, and 28 is provided with its own adjust-v ment means in the form of a pair of cylinders. Thus roll 26 has operatively associated therewith, in a manner de-. scribed hereinafter, a pair of

cylinders

3 and 4. Similarly, roll 27 has associated therewith a pair of cylinders 5 and 6, while roll 28 has associated therewith a pair of cylinders. 1 and 2. It not being necessary to provide ad-, justability of roll 29 since the adjustment between this roll and cooperating

rolls

27 and 28 may be obtained 'by adjustment of the latter two rolls as clearly indicated in Big. 6; roll 29 preferably has no cylinders associated therewith. One cylinder of each of the three pairs enumerated is mounted on panel 75 while the other of each pair is mounted on panel 76. As shown in Fig. 1, the. means for each such mounting may comprise a U-shaped bracket 11 which is fastened to

panel

75 or 76, as the case may be, by bolts 111 or the like and has apertures 131 in the reaches 141 thereof to. receive the respective cylinder it is to mount. A plurality of reins forcing rods 142 are preferably provided to extend be. tween reaches 141.

Since, each of the four

cylinders

3, 4, 5, and 6 asso- AIQQ- h he. doctor rolls are identical, a description of cylinder 3, for example, will sufiice to indicate the structure of the cylinders 4, 5, and 6. Cylinder 3 comprises, a cylindrical housing 51 at either end of which is neunted one ofa pair of

closure members

52 and 53 to define a space. 61. A liner 50 is provided for the interior surface of the cylindrical housing 57. A shaft 46 disposed substantially axially of cylinder 3, extends through

bushings

5,7, and 58 positioned in

apertures

157 and 15,8, i espectively, provided in the

closure members

52 and 53, respectively. Bushings 57 and 58 are each secured in their respective positions by means of screws 52:, and Fixedly mounted upon an intermediate, portion of the shaft 46 for movement therewith is a piston ma n-her 45 adapted to, reciprocatewithin the space 61 with the peripheral edges of said piston riding within the inner surface of liner 50. A pair of diaphragms or cup leathers 47 have the edges thereof protruding from the edgesef said, piston to provide a seal in cooperation with proper sealing engagement with the surfaces of the movablfiflshaft 46 upon reciprocation thereof with the piston There are provided passageways 55. and 56 in the left hand;

andrighthand closure members

53 and 52, respectively, to. which are connected

conduits

66 and 67, respectively. These latter condu-itsare connected to a gas pressure system which will be described later.

Supportedonthe closure member 53 is a cap member 5 '54; The end of the shaft 46 extending through bushing the liner 50. Bushings 58 carry packings 44 to assure arm-ass end of shaft- 46 is provided with screwflthreads 47. Threadedly mounted on the threaded end 47 of shaft 46 is an adjusting nut member 8 on which is fixedly mounted for rotation therewith a circular handle 14. The entire assembly comprising the cylindrical casing 51, the two cap members 52, '53, therefor, and the last named cap 54 are joined in operative relationship by means of a plurality of .bolts 55 passing through suitable flanges on each of the named elements as seen in Figure 4. On the extreme end of the threaded portion 47 of shaft 46 there is provided lock nut means 18 for assuring that the adjusting nut member '8 does not shift its position along the threaded portion 47 once it has been manually positioned.

n the other end 49 of shaft 46 there is keyed, to prevent relative rotation therebetween, :a collar 56. Collar 56 is attached to block 143 which mounts bearing 43 as described hereinbefore. Thus any displacement of piston 45 in its cylinder is accompanied by equal displacement therewith of block 143 along its tongue and groove guides 145, 145, and with it, of course, bearing 43 and shaft 126 supported therein.

It will be apparent that the introduction of fluid pressure into the space 61 to the left of piston 45, as viewed in Figure 3, will urge the piston 45 and the shaft 46 therewith (as well as the doctor roll shaft 126 mounted in bearings 43 connected thereto) to the right as viewed in Figures 3 and 6 towards upper glue spreader roll 28. It will further be apparent that extent of such movement of shaft 46 and the assembly mounted thereon will be limited by the abutment of the right hand surface of nut memher 8, as viewed in Figure 3, with the surface of cap member 54. It will also be seen that the shaft movement limiting eifect of nut member 3 may be adjustably varied by shifting said nut member 8 along the threaded end 47 of shaft 46 in one direction or the other by relative rotation therebetween. To permit the accurate adjustments required, calibrated indicia (not shown) are placed around the periphery of adjusting nut element 8 to cooperate with a pointer 62 fixedly mounted on cap member 54. In an operating embodiment of the invention, the marks may be spaced so that moving one mark represents .012 inch longitudinal movement of nut 8 on shaft 46. Obviously, other values may be chosen to suit the particular purpose desired. As stated hereinbefore, lock nut 18 may be manipulated to fix the adjusted position of nut member 8 on shaft 46.

Glue spreader roll 28 has a pair of

cylinders

1 and 2 operatively associated therewith which are of similar construction and closely resemble the cylinder structure of

cylinders

3, 4, 5 and 6 as exemplified in the detailed description of cylinder 3 hereinbefore. Thus the similar elements in cylinder 1 are indicated by the same numerals used to designate like structure in the other cylinder 3 but with the addition of primes. The essential difierence resides in the adjustment structure mounted on the threaded end 47 of the shaft 46'.

Thus instead of the adjusting nut member 8 with the handle 14 thereon, there is provided a nut member 118 on which is fixedly mounted a sprocket 114. Sprocket 114, in turn, functions as a mounting for a cap member 7. Cap member 7 provides a mounting for a ratchet handle 12. An indicator bar 162, fastened to the main cylindrical assembly by means of one of the bolts 55', extends to the periphery of the cap member 7 upon which suitable indicia may be inscribed as already described for cap member 54 of cylinder 3. It will be noted that while each of the cylinder adjustment means for the doctor rolls 26 and 27 is individually adjusted, the adjustment nuts 118 for the two

cylinders

1 and 2 associated withthe 6 and 115 operatively associated with

cylinders

1 and 2, re spectively. 1 a

As in the case of shaft 46, shaft 46 has a collar member 156 keyed thereto. A block element 148 is fixed to said collar 156 and carries bearing 43 for shaft 128 of upper glue roller 128. The bottom of glue hopper 32 is cut out so that the main portion of doctor roll 26 and almost a quadrant of glue roll 28 is positioned within the hopper as seen in Figures 2 and 6. The side walls of the hopper extend downwardly, however, to the extent indicated in Figure 6, to form with the side surfaces of

rolls

26 and 28 with which they closely abut, a seal to prevent leakage of glue from the hopper 32. The sealing abutment of

rolls

26 and 28 with the side walls of hopper 32 may be seen in Fig. 1.

Figure 6 shows a diagrammatic representation of the movements of the various rolls possible by manipulation of the adjustment means for each of the associated cylinders. Specifically, glue spreader roll 28 may be moved towards and away from the lower glue spreader roll 29 and the work W positioned therebetween as indicated by the opposed arrows to assume such positions as those indicated by the full line disclosure of roll 28 and the dotted line disclosure of the same roll at 28. Similarly, roll 27 may be moved towards and away from the roll 29 as indicated by the opposed arrows and the full line and dotted line disclosures 27 and 27'. In the case of doctor roll 26, it will be observed that the glue is confined in the upper hopper 32 by means of the upper surface of the roll 26 itself and a scraper member 132. Accordingly, since relative movement between the roll 26 and the scraper 132 would obviously result in loss of glue between these two elements upon their separation, the glue hopper 32 and the shaft for the doctor roll 26 are mounted as a single movable unit. Thus, operation of the

cylinders

3 and 4 results in movement of the entire glue hopper and doctor roll assembly in the directions indicated by the opposed arrows to the positions indicated in full at 26, 126 and 32 and in dotted lines at 26, 126 and 32'.

Movement of the piston in each of the cylinders 1 to 6, inclusive, is obtained in one direction or the other by upper glue spreaderroll 28 may be operated simultaselective introduction of gas pressure into the space at either side of the particular pistons via the

conduits

66, 67 in the cases of

cylinders

3, 4, 5 and 6 and via 66' and 67 in the cases of

cylinders

1 and 2. In the embodiment of the invention shown, a conduit 65 is connected to a pressure source (not shown). Located in suitable connections between the said conduit 65 and the various pairs of

conduits

66, 67 and 66', 67 for the respective cylinders, there is located one of the

selector valves

22, 23, and 24 whereby fluid pressure from conduit 65 may be selectively directed to either of conduits 66 and 67 (or 66' and 67') and hence against either side of the piston within the cylinder to which said pairs of conduits are connected. A pressure reducing valve 25 is located in each of the conduits 66' leading to the spaces 61 of

cylinders

1 and 2 at the side of the piston 45 which is on the same side as the screw threaded adjustment means. Thus the maximum pressure which may be applied against the upper faces of faces of pistons 45' is limited to a desired value, such as 10 lbs. per square inch, by way of example only. Such desired value will keep the roll 28 in proper adjustment but permit raising of the same by abnormal thickness in or on the Work W which may inadvertently contact them. In other words the gas pressure at a limited value affords a cushioning resiliency to the roll 28 under extraordinary circumstances but assumes proper and positive adjusted positioning during normal operating conditions. In the case of the

rolls

26 and 27, which do not contact the work W, and hence are not subjected to the same probability of encountering variations in thickness, no pressure reducing values are inthe pistons in both the operative position as well: as; in:

the inoperative position, instead: ofonlyv inthe latter.

Themechanism so; far described when not in use, willhave, the valves 22, 23, and 24'turned to. their rezsp ective positions whereby conduit: 65- leading from the pressure source will be connected into. each of the; con-. duits 67' (and, conduits-67). Thus, the full .line pressure willbe appliedagainstthat surface of eachofthepistons; 45 and 45; to urge, them-toward-the endof chambers. 61., and 61; which are closer toathe. adjustment means whereby the. shafts46 and 46' and.theibearingassemblies 48,.and 48'. attachedthereto move. to.- withdraw each'of theurolls .26, 2,7 and 28, from theparticular;rolLadjacent plicated gearing interconnections between the two sets of.

rolls as conventionally provided to present problems of removing a given one or others of the rolls.

With the rolls in the withdrawn, position stated, the glue.

hoppers

31, 32 may be supplied with glue and the adjustment means for eachof the. rolls manipulated. Specifically, for adjustment of the, gluev spreader roll 28, ratchet handle 12 may be manipulated to rotate cap 7 of cylinder 1, and with it, sprocket 114-and nut member 118 whereby the latter, rotating on the screw threadsat,,the end 47 of shaft 46', is caused to shift its. position thereon to the one-chosen by the operator of the device; That is, the cap 7 is caused to rotate so that the particular indicia thereon (which designates the desired adjustmentof the roller. 28 when in operative position) coincides with the pointer 62. Due to the sprocket chain connection 13 between the'sprockets 114- of cylinders 1. and, 2, respectively, nut 118 is caused. to be shifted to .the same relative position on shaft 46 of.

roll 28 .relative. to spreader roll Bend the work passing therebetween will be equal throughout the lengths of the. .said rolls. Due to the interconnection of the adjust

ment meansfor cylinders

1 and 2, each-of the former acts-as check means, to. prevent the going out of adjustment of the other except upon positivemanipulation of ratchet handle 12.. as already described.

In regard, to the adjustmentof the .doctor. rolls 26. and,.2,7, each of

cylinders

3, 4,- 5 and 6 has its own separatelymanipulated adjustment means. Thus, each of 'the adjusting; nut members 8 is givenits desired relative,position along the screw threadcd end 47 of its rcspective shaft 46 .by rotation of such nut member by means of handle 14. Since the mutual checkingaction between pairs of adjustment means as described for cylinders 1 and 2.is lacking for the separately adjusted cylinders 3,. 4, 5 and 6; lock nut members 13-rnay be tightenedupon adjusting nutsd after the latter has been positioned as desired so that axial shifting thereot' is preventedwhen the shaft 46gis shiftedto the

operative valves

22 and 24 to connect conduit 65 with the conduits 66-1015

therespeetivelcylinders

3, ,4, ..5. and.6; may-then. be;

donea Withzthe: rolls;26, 27 and..28-in operativeposition and": under proper: adjustment, andzthe. veneer W in-position. between-rolls 28andz29, the separaterdriving means-35.- and 36. may, be rendered operative (by manipulation of suitable. switchesnot shown): whereby all the rollswill'.

be driven by the; sprocket and sprocket chain. assemblies 1 described previously. The-veneer W is.caused to movein; the direction of the=-horizontally disposed arrow upon! rotation" of rolls 28 and 29-in vthedirection of the-curved arrows Cooperatingrg uide

elements

159 and 160, be-- tween which therveneer W moves,.assure theproperposi-r tioning of the latter at the feeding'end whileagrate: 1611 guides the-veneerover. glue; hopper: 31 after application of. glue by thecrolls 28 and 29;

The .chosen' adjustment will .benmaintained !without any;

variation. -.due to the. positive and constant action .of the fluid. pressurewhich-causes, via; the pistons :and shafts' on which theyaremounted, all slaekibetween: the threads ofthe-shaftends 47 and 0f the nut-members :81'and 118;

to be eliminated. However,,due.to=the.inclusion.:of the reducing, ,valve 25'for. limitingthepressure in conduits 66 and. hence. against the upperv surface of each of pistons-.-45.' incylinders 1 and 2, respectively, the positive adjustment-of glue roller 28vis yieldable to the extent of. accommodating gforrexcessive thickness in the work W- or the: like. In. suchmanner, damage to the roller28 is obviatedwhile the desired positiveness and constancy of. adjustment: is notsacrificed.

Preferably, .outletmeans are provided for the lower gluehopper 51. Such means may comprise a simplepipe 73. connected into theibottom of hopper 31 and controlled by a valve. 74.. The. end of pipe 73.preferably may be 1 on said hopper.. 40"

positioned. over a spill-over hopper 40 which extends. for substantiallyuthe dimensions of the framework whereby all sp'illageis collected. Upper glue hopper 32. may: be emptied by removing scraper 132 from its mounting In the embodiment of theinvention shown, the discharged. glue will findits way intolower hopper Bland thence .via pipe73 to the spill-over hopper 40,- vif desired.

It will be apparent. to those skilled in the. art that varlousmodifications andembodiments of the above described'invention may be resorted to without departing from the spirit of the invention and the scope of the claims appended hereto.

For example, the spreader apparatus might be used to apply material other than glue upon appropriatework. in those cases where an accurate, foolproof, and/ or foulproofadjustment of the amount. of material spread. is desirable. by the use of gas such'as air, or the like, as the pressure medium for actuating the pistons in the cylinders because of .the inherent characteristic of resilience of such. media; in some installations, the employment of some other fluid pressuremedium, e. g., water or oil, may be suitable.

What I claim (is:

l. Inaglue spreader, a roll for accommodatinga film of glue thereon, means rotatably mounting said roll, a hollow'cylinder, a' shaft passing through said hollow cylinder," means connecting one end of said shaft to said' inderand mounted on said shaft for movement therewith, means forintroducing fluid pressure into said hollow cylinder. selectively at either end'of said piston for moving thesame and .the shafttherewithin either direction, acap" covering onezendof said hollow cylinder, meanslimiting themovement of saidshaft at least in one direction by contacting ,said' cap; and. screw means mounted on. the-other end of. said. shaft. for adjusting the etfect of said. limiting means.

2. Ina-gluespreader, a roll. for accommodatingz a film".- of glue thereon, means rotatably mounting said roll, a

Also while superior results are obtained.

in said cylinder, a shaft passing through said space and said end closure members, means connecting one end of said shaft to said mounting means, a piston movable in said space and mounted on said shaft for movement therewith, means for introducing fluid pressure into said space selectively at either end of said piston for moving the same and the shaft therewith in either direction, means limiting the movement of said shaft at least in one direc tion, said means comprising first abutment means longitudinally adjustably mounted on the other end of said shaft and cooperating second abutment means mounted for engagement by said first adjustable abutment means after a predetermined amount of movement of said shaft in said one direction depending upon the relative positioning of said adjustable abutment means along the length of said other shaft end said second abutment means comprising a cap covering one end of said hollow cylinder.

.3. In a glue spreader, a roll for accommodating a film of glue thereon, means rotatably mounting said roll, a hollow cylinder, end closure members enclosing a space in said cylinder, a shaft passing through said space and said end closure members, a cap covering one of said end closure members, means connecting one end of said shaft to said mounting means, a piston movable in said space and mounted on said shaft for movement therewith, means for introducing fluid pressure into said space selectively at either end of said piston for moving the same and the shaft therewith in either direction, means limiting the movement of said shaft at least in one direction, said means comprising first abutment means threadedly mounted on the other end of said shaft and cooperating second abutment means comprising said cap mounted for engagement by said first abutment means after a predetermined amount of movement of said shaft in said one direction depending upon the relative positioning of said first abutment means along the length of said other shaft end, and operating means mounted on said first abutment means for rotating the same on said shaft.

4. In a glue spreader, a roll for accommodating a film of glue thereon, means rotatably mounting said roll, a hollow cylinder, end closure members enclosing a space in said cylinder, a shaft passing through said space and said end closure members, a cap covering one of said end closure members, means connecting one end of said shaft to said mounting means, a piston movable in said space and mounted on said shaft for movement therewith, means for introducing fluid pressure into said space selectively at either end of said piston for moving the same and the shaft therewith in either direction, means limiting the movement of said shaft at least in one direction, said means comprising first abutment means threadedly mounted on the other end of said shaft and cooperating second abutment means comprising said cap mounted for engagement by said first abutment means after a predetermined amount of movement of said shaft in said one direction depending upon the relative positioning of said first abutment means along the length of said other shaft end, and a sprocket wheel mounted on said first abutment means and adapted to be engaged by a sprocket chain whereby said first abutment means may be rotated by movement of said chain.

5. In a glue spreader, a roll for accommodating a film of glue thereon, means rotatably mounting said roll, a hollow cylinder, end closure members enclosing a space in said cylinder, a shaft passing through said space and said end closure members, a cap covering one of said end closure members, means connecting one end of said shaft to said mounting means, a piston movable in said space and mounted on said shaft for movement therewith, means for introducing fluid pressure into said space selectively at either end of said piston for moving the same and the shaft therewith in either direction, means limiting themovement of said shaft at least in one direction, said means comprising first abutment means threadedly mounted on the other end of said shaft and cooperating second abutment means comprising said cap mounted for engagement by said first abutment means after a predetermined amount of movement of said shaft in said one direction depending upon the relative positioning of said first abutment means along the length of said other shaft end, and sprocket means restraining at least in one direction the horizontal movement of said first abutment means on said shaft end.

6. In a glue spreader for wood veneers, a roll for accommodating a film of glue thereon, means rotatably mounting said roll, a pair of hollow cylinders, a shaft passing through each said hollow cylinder, means connecting one end of each of said shafts to a difierent portion of said mounting means, a piston movable in each of said hollow cylinders and mounted on each of said shafts for movement therewith, means for introducing fluid pressure into said hollow cylinders selectively at either end of said pistons for removing the same and the respective shafts therewith in either direction, caps covering one end of said hollow cylinders, positive screw means limiting the movement of said shafts in only one direction, said screw means mounted on the other end of each of said shafts for adjusting the effect of said glimiting means by contacting said cap, and means for manipulating said screw means simultaneously.

7. In a glue spreader, first and second rolls for accommodating films of glue thereon, said first and second rolls being arranged substantially one above the other, first and second means rotatably mounting said first and second rolls, respectively, a hollow cylinder, a shaft passing through said hollow cylinder, means connecting one end of said shaft to said first mounting means, a piston movable in said hollow cylinder and mounted on said shaft for movement therewith, means for introducing fluid pressure into said hollow cylinder selectively at either end of said piston for moving the same and the shaft therewith in either direction towards and away from said second roll, cap means positioned over one end of said hollow cylinder and limiting the movement of said shaft in the direction towards said second roll, and screw means mounted on the other end of said shaft for adjusting the effect of said limiting cap means.

8. In a glue spreader, first and second glue spreader rolls, first and second doctor rolls each adapted to engage the respective one of said first and second glue spreader rolls, separate means each rotatably mounting one of said rolls, three separate pairs of hollow cylinders, a separate shaft passing through each one of said hollow cylinders, respectively, means connecting one end of each of said shafts of each pair of said cylinders to each one of three of said mounting means, a piston movable in each of said hollow cylinders and mounted on the associated one of said shafts for movement therewith, means for introducing fluid pressure into each of a pair of said hollow cylinders selectively at either end of each of the pair of said pistons operatively associated therewith, re spectively, for moving the same and the shafts therewith in either direction towards and away from at least one other roll, cap stop means limiting the movement of each of said shafts at least in one direction, and screw means mounted on the other end of each of said shafts for adjusting the effect of said cap stop limiting means.

9. In a glue spreader, first and second glue spreader rolls, first and second doctor rolls each adapted to engage the respective one of said first and second glue spreader rolls, separate means each rotatably mounting one of said rolls, three separate pairs of hollow cylinders, a separate shaft passing through each one of said hollow cylinders, respectively, means connecting one end of each of said shafts of each pair of said cylinders to each one of three of said mounting means, a piston i with, valve means for introducing fiuid pressure simultaneously into each of a pair of: said. hollow: cylinders selectively at. either end of each.of.the:pair ofzsaid pistons operatively' associated. therewith, respectively; for moving the same and the'shafts therewithzineither di-' rection towards andaway from at least: one-other'rolhcap stop means limiting the movement of'each': of said shafts at least in one'direction, and-screwmeansmounh ed on the other end of'each of said shafts for. adjusting the effect of said cap stoplimitingmeans.

10. In a glue spreader; first and-second glue spreader rolls, first and second doctor rolls each adapted to engage the respective one of said first and second glue spreader rolls, first glue hopper means-for supplyingzglue to said first doctor roll and. mountedv for movement therewith, separate means eachrotatablymounting one of said rolls, three separate pairs of hollowcylinders, a separate shaft passing through each one of said hollowcylinders, respectively, means connecting. one end of said shafts of each pair of said cylinders to each one of three of said mounting means, a piston movable in and screw means mounted on the other end of eachofv said shafts for adjusting the effect of said cap limiting means.

ll. In a glue spreader, first andsecond glue spreader rolls, first and second doctor rolls each adapted to engage the respective one of said first andsecond glue spreader rolls, first glue hopper meansfor supplying glueto said first glue spreader and doctor rolls, second glue hoppermeans for supplying glue to said second glue spreader and doctor rolls, separate means each rotatably mounting.

one of said rolls, three separatepairs of hollow cylinders,

a separate shaft passing througheach one of saidhollow cylinders, means connecting one end of said shafts of each pair of said cylinders to each oneof said mounting'mea'ns for said doctor rolls and to said mounting means for said first glue spreader. roll, said second gluez spreader roll being mounted within the confines of said second. glue hopper means, a piston movable in each said hollow cylinder and mounted on the associated one. ofi-said-shafts for movement therewith, valve means: for introducing fluid pressure simultaneously into each. ofiapair ofnsaid hollow cylinders selectively atleither endofeachof'the.

pair of said pistons operatively associated therewith. for moving the same and the shafts .therewithrin-either direction towards and away from at least one otherrolhcap means limiting the movement of each of said shafts at least in one direction, and screw means mounted ontheother end of each of said shafts for adjusting-theeifect of said cap limiting means.

12. In aglue spreader as set forth in claim ll inwhich.

chain means are interconnected'with said screw'means for adjustment of one of said rolls so that'b'othsides of said roll will be the same and restrainedfrom getting out of adjustment.

13. In a glue spreader as set forth in claim-llv wherein a pressure reducing valve is operatively associated with one side of a pair of said hollow cylindersso.that alowpressure against said pistons will maintainthe positive adjustment While 'yieldablewhen'work of excess thickness passes between said 'spreader'roll's;

14. In a glue spreader as set forthiin=claim" 1'l wherein said first glue spreader roll is mounted only partially within the confines of said first'gluehopper and movable therewith as a'unit;

15; In a spreader apparatus, first and second spreader" rolls, first and second doctor rolls'each'adapted to'engage the respective one of said first and second spreader rolls,

separate-means each-rotatably mountingone of said rolls; three separatezpairs' of. hollow-cylinders, a separate'shaft passing through each one of said'hollow cylinders, re-

spectively,,means' connectingoneend-of said shafts of each pair of said cylinders to eachone-of three of'sa'id mounting. means, a piston movablecin each said hollowcylinder and mounted on the associated-oneof said shafts for movement therewith, valve means for introducing fluidpressure simultaneously into each of a'pair of said hollow cylinders selectively at either endlof each of the pair of said pistons operatively associated therewith for moving the same and the shafts therewith ineither direction towards and away from atleast oneother roll, means limiting the movement of'each of said shafts at least inone direction, screw means mounted on the other end of each of said shafts for adjusting the effect'of said limiting means, pressure reducing means for yieldably' holding said spreader roll, and means: for limiting the movement of each said screw means alongvitsrespective shaft at least in one direction.

16. In a glue spreader for wood veneers, first and second glue spreader rolls, variablerspeed'drivingmeans for said spreader rolls, first and second. doctor rolls-each adapted to engage the respective one of: saidfirstsand second glue spreader rolls and arrangedxso that the axisv passing through the centers of the first glue spreader roll and doctor roll is at an'angle to the axis passing through the centers of the second glue spreader roll and doctor roll, variable speed drivingmeans for said'doctor. rolls. separate and independent from said first.mentioned'driv-'- ingv means, first glue hopper means for supplying. glue to said first glue spreader anddoctor rolls, second glue, hopper means for supplying-glue to said glue spreaderrand,

doctor rolls, separate means each rotatably mountingone of said rolls, three separate pairs of hollow cylinders, a separate shaft passing through each one of said hollow cylinders, means connecting one end of'said shafts of each pair of said cylinders to each one of said mounting means for said doctor rolls and to said mounting-means for said first glue spreader roll, said first glue spreader roll being mounted only partially within thev confines of said first glue hopper and movable therewith as a unit, said second glue spreader roll being mounted within the'confines of said second glue hopper means and movable independently thereof, a pistonmovable in each said hollow cylinder and mounted on the associated one of said-shafts for movement therewith, valve means for introducing fluidpressure simultaneously into each of a pair of saidhollow cylinders selectively at either end of' each of the-pair of said pistons operatively associated therewith for moving the same and the shafts therewith in either direction towards and away from at least one other roll, means limiting the movement of each of said shafts at least in one direction, screw means mounted on the other end of each of said shaft for adjusting the effect of said limiting. means, chain means interconnectingsaid screw means for adjustment of one of said rolls. so thatboth sides of said. roll will be thesame andrestrained from getting out of adjustment, and a pressure reducing valve operatively. as-

sociated with onesideaof a pair of said hollow cylinders whereby a low pressure. againstsaid pistonswill maintain the positivev adjustment while. yieldablewhen work of excess thickness passes between said spreader rolls.

17. In a glue spreader, first andsecond' glue spreaderrolls, first and second doctor rolls each adaptedto. en-

gage the respective one of said first andsecond glue spreaderv rolls, first. glue hopper means for supplyingglue to said.firstgluelspreader. and doctor rolls, second glue hopper. means. for supplying; glue: to said secondglue spreader and doctor rolls, .separatesmeanseach rotatably' mounting one. of: said rolls, hollow cylinders a: separate:

shaftapassing through each one of said holl'ow cylin'ders;

means connecting one end of said' sh'afts o'f' said cylinders to each one of said mounting means forsaid doctor rolls and to said mounting means for said first glue spreader roll, a piston movable in each said hollow cylinder and mounted on the associated one of said shafts for movement therewith, valve means for introducing fluid pressure simultaneously into each hollow cylinder selectively at either end of said pistons operativeiy associated therewith for moving the same and the shafts therewith in either direction towards and away from at least one other roll, means limiting the movement of each of said shafts at least in one direction, screw means mounted on the other end of each of said shafts for adjusting the effect of said limiting means, and a pressure reducing valve operatively associated with one side of a pair of said hollow cylinders whereby a low pressure against said pistons will maintain the positive adjustment while yieldable when work of excess thickness between said spreader rolls.

References Cited in the file of this patent UNITED STATES PATENTS Vuono July 20, 1920 Massey Mar. 25, 1941 Fluckinger Oct. 10, 1944 Coates Apr. 10, 1945 Nordquist Mar. 5, 1946 Muggleton et al Apr. 23, 1946 Muggleton et al Apr. 23, 1946 Taylor Nov. 22, 1949 Perry et al. Aug. 5, 1952 Hoel Aug. 12, 1952