US2305525A - Veneer gluing machine - Google Patents

Description

Dec. 15, 1942. us- 1 7 2,305,525

VENEER GLUING MACHINE FiIed May 1, 1939 s Sheets-Sheet 1 INVENTOR.

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TToimEYs.

1942- G. M. GUSTIN VENEER GLUING MACHINE Filed May 1, 1939 3 Sheets-Sheet 2 1N VENTOR ATTORNEYJ.

O O O O O O L ly 5 Dec. 15, 1942. a. M. GUSTIN 2,305,525

VENEER GLUING MACHINE Filed May 1, 1959 3 Sheets-Sheet 5 2f INVENTOR. BY eo/zi'e jaw m 4 M v c%%.

ATTORNEYS.

Patented Dec. 15, 1942 VENEER GLUING MACHINE George M. Gustin, Wabash, Ind., assignor to The G. M. Diehl Machine Works, Wabash, Ind a corporation of Indiana Application May 1, 1939, Serial No.-271,071

15- Claims. (01. 144-219) My invention relates to improvements in veneer joining machines and particularly to that type of machine primarily adapted for uniting the edges of, veneer sheets and like material.

One of the objects of my invention is to provide means for applying to the edges of th veneer sheets, as the sheets are fed into the pressing part of the machine;a liquid either in the form of an adhesive or a moistener for the adhesive which has previously been applied.

In gluing veneer sheets edge to edge, in certain commercial practice, it is the custom to apply. the glue or other adhesive to the edges of the sheets as these edges are trimmed. The adhesive becomes dry in storage or at least prior to the gluing of the sheets together and in certain commercial practices, it is the custom to apply a liquid, gem erally formaldehyde, for moistening and soften ing the glue before the sheets are fed into the machine for applying heat and pressure to the va neers to cause the sheets to abut edge to edge.

It is one of theobjects of my invention to pro.-. vide a machine having an improved means for applying such formaldehyde or other softening material to the edges of the veneer for softening the glue, or for applying the adhesive itself if none has been previously applied.

Another object of my invention is to provide an improved means for applying continuous pressure to the adjacent edges of the veneer sheets as they U pass through the machine.

Other objects and advantages of the invention will appear more fully hereinafter in the accompanying specification and claims.

' For the purpose 01' disclosing my invention, I

have illustrated an embodiment thereof in the accompanying drawings, in which:

Fig. 1 isatideolemlon of a machine embo'dye ing my invention;

Fig. 2 is a transverse sectional view of the presser head, also showing a portion of the bot.- tom run of the feeding chains Fig. 3 is a longitudinal sectional view of the presser head;

. Fig. 4 is an enlarged detail, in side elevation, of the presser chain as mbly;

Fig. 5 is an end ele ation of the subject matter illustrated in Fig. 4;

Fig. 6 is an enlarged detail, partly in section, of

' the liquidapplying mechanism; Fig. 7 is a detail sectional view of th presser driving chain; and

/Flq8 is a fragmentary plan of thesupporting tabiennd accompanying conveyor chains;

In the embodimentof the invention illustrated,

table 2 within the surface of which is adapted in travel a pair of conveyor chains 3 arranged side by side and in somewhat spaced relationship. These conveyor chains may, if desired, converge toward one another from the front toward the rear'of the table. Disposed between the chains is a heating platen l beneath which is arranged a heating chamber 5 through which is adapted. to be passed suitable live steam for generating sufiicient heat to heat the platen and therefore heat the adjacent edges of the veneer sheets as they are passed through the machine by the conveyor chains.

Supported above the work: table 2 is a presser headii which is preferably vertically adjustable relatively to the table through the medium suitable adjustable mechanism (not shcwnl. This presser head comprises an enclosing casing "i preferably in the form of a casting having side openings closed by cover plates ii and within the casing are the pressure chains.

chains comprise a series of pressure blocks 9 or pressure plates, each having secured on the upper face thereof a pair oi brackets suitably spaced apart and adapted to receive between the same a link driving sprocket chain it. The brackets Ill are adapted to be connected to the chain through the medium of extended pivot pins -l3 of the links of the chain i2 which pins pass through the brackets Hi and through the links it of the chain. The chain is driven from the shaft upon which is mounted the'driving sprocket It mounted within an end housing 6' slidably Y face thereofto the presser pin or rod H. For

1 provides. suitable base I carrying an operatin 55 pivotally connecting the block to the pin, apivot l8 extends through the bracket arms and-the bottom end of this pin or. rod. The rod extends upwardly between a pair of guide plates l9 and I] p which plate are held in spaced relation by suit-:

able hollow bushings 2| surrounding the rod and at its upper end is provided with a threaded bearlug nut 22 held in its adjusted position by a lock macs. These guide plates 19 and an assist in maintaining and guiding the presser pins or rods 11 in their vertical position. This bearing nut provides a bottom bearing for a coiled spring 24,

the upper end of which surrounds a guide lug 25 carried by a laterally extending arm 26 projecting from a central longitudinally extending web 21.

The web, at suitable intervals along its length, has screw-threaded into bosses 28 thereon supporting screws 29 which have fixed on their upper ends, on the outsid of the casing, worm gears 30 adapted to be rotated by worm pinions 3|] on a shaft 32, whereby the web may be vertically adjusted and thus the tension of the springs 24 varied to meet varying pressure requirements. Each of the pressure shoes I has secured on its under face a pair of tracks 33 having preferably V-shaped faces and these tracks each bears upon V-shaped rollers 34 carried by the links 35 of a roller chain. These rollers 34, in turn, bear upon similar track 36 extending upwardly from the upper face of the pressure plates 9. There is thus provided groups of floating rollers interposed between the pressure shoes I 5 and the pressure plate 9 whereby the pressure from the feet is transmitted to the plates with a minimum of frictional 1 resistance, due to the fact that the plates are carried on a moving chain and the feet remain substantially stationary. At the same time, due to the V tracks and corresponding grooves in the rollers, lateral displacement is resisted.

In order that the pressure shoes l5 of the entire series may be maintained in proper alignment, a continuous aligning strip 31 rests upon the t p of the feet, being disposed between the brackets 96 and beneath the supporting pins I l and between pairs of vertically extending lugs 39 on the upper faces of the shoes. The parts I! are thus held against rotative movement and the shoes therefore held in proper alignment. While maintaining the presser shoes in alignment, this st ip permits free vertical movement of the presser shoes and likewise permits them to pivot on their pivot pins i3. Due to the fact that the strip 31 is relativelv w de compared to its thickness. it is late a ly ri id. alth ugh vertically flexible.

The upper run of the floating friction reducing chains travels on V-shaped tracks 40 mounted upon the upper face supporting plate 4| which.

at their ends and at intermediate points. rest upon and are secured to cross webs 42 extend ng tra sversely between side walls of the cas n 1.

The spaced guide plates i9 and 20 are held in cla p d together position by suitable clamping bolts 43 and are s p orted from cross webs 44 extending between the side walls of the casing I throu h the medi m of su porting bolts 45 which sc ew into the bottom ed es of these cross webs. These cross webs also assist in supporting the supporting plates 4|. At the front end of the asing, I provide arcuate gu de tracks for the fricti n reducing roller chains. These tracks prefe ably c nsist of plates 46 bolted to the opposite ed es of vertically disposed spacer bars 41 which bars in turn are bolted to upwardly extend ing supporting brackets 48 projecting from the -u.pper plate Iii. The roller chain including the links 35 and the rollers 34 is disposed between the presser shoes I 5 and the presser chain comprising the plates 9 and the driving chain l2 therefor. By this arrangement, a floating friction reducing member is interposed between th presser shoes l5 and the chain which comes in contact with the veneer. This materially reduces the friction between the parts.

The floating friction reducing chains travel over similar guide plates 49 at the rear end of the machine, which guide plates are pivoted at 49 and biased outwardly by springs 49 to prevent slack in the floating chain.

The veneer sheets, as is obvious, are fed forward on and by the conveyor chains 3, pressure being applied to the veneer sheets above the conveyor chains by the pressure plates 9, as above described. In view of the fact that the conveyor chains and accompanying pressure chains or feet are separated, the abutting edges of the veneer sheets do not come in contact with the pressure chains. In order to apply pressure to the abutting edges, and at the same time apply heat to these abutting edges, I provide an ironing foot or plate which, at its forward end, projects through a slot 5| in the forward end of the casing and is bolted to the front end of the casing as at 52. This ironing plate extends rearwardly the full length of the pressure chains and is located immediately above the joint of the veneer sheetsand immediately beneath a stem or heating chamber 53 which is disposed between the two pressure chains. Heat is conducted to the ironing foot or plate through the medium of upwardly extending springs 54 which are riveted to the top surface of the ironer and bear on the under surface of the heating chamber 53. By this arrangement, not only is suflicient pressure applied to the spray mechanism. To this end, a spray nozzle comprising the spray pipe 55 is projected up through a suitable opening 56' in the table. This pipe, at its upper end, has a jet nozzle 51, preferably screwed therein, and it surrounded by an annular cup 58 coveredby a perforated disc 59. This cup has a drain opening 60 for carrying off any excess moisture as the result of the spraying action. The pipe 55 projects into a closed container 6| mounted beneath the table into which pressure is admitted from a suitable pressure pipe above the liquid contained therein. As a result of this pressure, the liquid is forced up through the pipe 55 and through the jet nozzle 51 being directed against the adjacent edges of the veneer sheets as they are fed over the same. The spray jet delivered by the jet nozzle 51 is of course extremely fine-and thin and a greater portion of the liquid remains on the edges of the veneer. However, there is a certain drip from the veneer and this drip is accumulated in the cup 58 and drained therefrom.

To confine the jet between the slightly separated adjacent edges of the veneer sheets, I provide a spring foot 62 comprising a baffle plate which overlays the top adjacent edges of the veneer sheets above the spray jet and this spring foot is secured to a spring 63 mounted upon an aligning fin 64 secured upon thetable surface 'in front of the spraying opening in the table. The jet thus passes between the adjacent edges of the veneer sheets and contacting the same also impinges upon the foot 62 which turns the jet back upon itself, thus insuring thorough moistening of the adjacent edges of the veneer and preventing the escape of the liquid between the adjacent edges of the veneer above the sheets.

In operation, a pair of veneer sheets is fed to the intake end of the machine. The adjacent edges of the sheets are maintained separated by the fin 64. As the separated edges pass over the nozzle 51, the edges, which have heretofore received adhesive, are moistened by the spray directed on the adjacent edges by the nozzle. After having received the moisture, the adjacent sheets pass forward until they are engaged between the bottom feed conveyors 3 and the presser plates 9 being carried by these conveyors and feet toward the rear of the machine. Due to the fact that the conveyors 3 tend to converge toward the rear end of the machine, the edges of the veneers are brought into abutting relation and due to the fact that the presser feet bear down on the tops of the adjacent edges, there is no danger of the sheets becoming wrinkled. As the sheets pass through the machine, the adjacent edges are pressed upon by the ironing foot or plate .50 and as the base t and the foot 50 are heated, the moistened glue edges are heated and dried so that by the time the sheets emerge from the rear end of the machine, their abutting edges are firmly secured together.

I. claim as my invention:

1. In a machine of the character described, the combination with a work table, of a pair of longitudinally traveling laterally disposed conveyor belts operating in the top of said work table, a pair of continuous presser belts disposed above said conveyor belts and having their bottom run cooperating with said conveyor belts, said presser belts each having a pair of tracks disposed on the inner surface thereof, presser feet disposed above said presser belts having tracks mounted on the under surface thereof and continuous roller carrying belts having the rollers on their bottom runs operating between the tracks on the presser feet and tracks on the presser belts for transmitting the pressure of said presser feet to the bottom runs of said presser belts.

2. In a machine of the character described, the combination with a work table, of a pair of longitudinally traveling laterally spaced conveyor belts operating in the top surface thereof, of a plurality of presser feet disposed above the upper run of each of said belts in alignment with one another, continuous presser belts having their bottom runs disposed between said presser feet and disposed conveyor belts and a continuous flexible strip disposed above and in contact with each set of longitudinally aligned feet.

3. In a machine of the character described,

the combination with a work table, of a pair of longit-udinally traveling laterally disposed conveyor belts operating in the top of said work table, a plurality of aligned presser feet disposed above the top run of each of said belts, a continuous flexible strip of material disposed above and bearing upon each set of aligned presser feet, means on the presser feet engaging the edges of said strip to prevent lateral displacement of the feet and continuous presser belts having their bottom runs disposed between said presser feet and said conveyor belts.

4. In a machine of the character described. the combination with a work table, of a pair of longitudinally traveling laterally disposed conveyor belts operating in the top of said work table, a plurality of longitudinally aligned presser feet disposed above the upper run of each of said belts, presser rods for said feet, means for pivotally connecting each of said feet to a presser rod and a continuous flexible strip extending above and pressing upon the longitudinally aligned feet of each set, means on said feet en'- gaging said strip to prevent lateral displacement of the feet and continuous presser belts having their bottom runs disposed between said presser feet and said conveyor belt.

5. In a machine of the character described, the combination with a work table, of a pair of longitudinally traveling laterally disposed conveyor belts operating in the top of said work table, a pair of continuous presser belts disposed above said conveyor belts and having their bottom runs cooperating with said conveyor belts, said presser belts each having a pair of track members disposed on the inner surface thereof, presser feet disposed above the bottom run of said presser belts having track members mounted on the under surface thereof, and continuous roller carrying belts having roller members on their bottom runs operating between the track members on the presser feet and the track members on the presser belt for transmitting pressure of the presser feet to the bottom runs of the presser belts, said track and roller members having a knife edge and knife-edge receiving groove contacting with one another.

6. In a machine of the character described, the combination with a work table, of a pair of longitudinally traveling laterally disposed conveyor belts operating in the top of said work table, a pair of continuous presser belts disposed above said conveyor belts and having their bottom runs cooperating with said conveyor belts, said presser belts each having a pair of knife edged tracks disposed on the inner surface thereof, presser feet disposed above said presser belts having knife edged tracks mounted on the under surface thereof and continuous roller carrying belts having rollers provided with V- shaped grooves in their peripheries operating between the tracks on the presser feet and the tracks on the presser belts for transmitting the pressure of said presser feet to the bottom runs of the presser belts- 7- In a machine for edge uniting veneers, in combination, a flat bedded work table, a pair of horizontally travelling laterally spaced conveyors in the top surface of said table, laterally spaced presser means disposed above said conveyors and adapted to press the adjacent strips of veneers onto said conveyors, an opening in said table between the paths of travel of said conveyors and at the intake end of said presser means, a flat baffle plate disposed in a plane parallel to the plane of said table above said opening and beneath which veneers are adapted 4 to pass, a vertically delivering nozzle mounted beneath said bed and delivering a stream of liquid vertically against said baffle plate between the adjacent edges of the veneer strips, and means for supplying said nozzle with liquid.

8. In a machine for edge uniting veneers, in combination, a worktable, a pair of horizontally travelling laterally spaced conveyors in the top surface of said table, laterally spaced presser means disposed above said conveyors and adapted to press the adjacent strips of veneer onto said conveyors, an opening in said table at the intake end of said presser means and between the paths of travel of said conveyors, a flat baffle plate disposed in a plane parallel to the plane of the table above said opening and beneath which the adjacent edges of the veneers are adapted to pass, a vertically disposed fin on said table in advance of said opening and maintaining the adjacent edges of the veneer strips separated as they pass over said opening, a vertically delivering nozzle mounted beneath said table and delivering through said opening against said baffle plate, and means for supplying said nozzle with liquid.

9. In a machine of the character described,

in combination, a work table, a pair of horizontally travelling laterally spaced conveyors in the top surface of said table, laterally spaced presser means disposed above said conveyors for pressing the work onto said conveyors, an opening in said table between the paths of travel of said conveyors and at the intake end of said presser means, a, flat baflle plate disposed in a plane parallel to the plane of said table above said opening and beneath which the adjacent edges of the veneer strips are adapted to pass, a vertically delivering nozzle mounted below said table and delivering through said opening against said plate, a drainage cup fitting within said opening and surrounding said nozzle, means for supplying said nozzle with a liquid, and means for delivering the liquid collected in said drainage cup to said supply means. 10. In a machine of the character described, in combination, a work table, a longitudinally travelling conveyor belt operating in the top surface thereof, a frame arranged above said table, a plurality of presser members longitudinally disposed in said frame and each member comprising a vertically extending post vertically movable in said frame, an elongated shoe mounted on a horizontal pivot at the bottom of said post and a. coiled spring bearing on said post for biasing said shoes toward said conveyor belts, a continuous presser belthaving its bottom operating between said shoes and said conveyor, a continuous roller belt disposed between said shoes and presser belt, tracks on the bottom faces of said shoes and tracks on the inner faces of said presser belts engaged by the rollers on said roller belt, and means extending between said shoes for preventing rotative movement of said posts to thereby maintain said shoes in longitudinal alignment.

11. In a machine of the character described, in combination, a work table, a longitudinally travelling conveyor belt operating in the top surface thereof, a frame above said table, a plurality of presser members longitudinally disposed in said frame and each comprising a vertically extending post vertically movable in said frame, an elongated shoe mounted on a horizontal pivot at the bottom of said post and a coiled spring bearing on said post and biasing said shoe toward said conveyor, a continuous presser belt disposed above said conveyor and having its bottom run operating between said shoes and said conveyor, a continuous roller belt disposed between said shoes and presser belt, tracks on the bottom faces of said shoes, and tracks on the inner faces of said presser belts engaged by the rollers of said roller belt, and means for interlocking said shoes one with the other against rotation on the vertical axis of said posts to maintain said shoes in lateral align ment.

12. In a machine of the character described, in combination, a work table, a longitudinally travelling conveyor belt operating in the top surface thereof, a frame above said table, a plurality of presser members longitudinally disposed in said frame and each comprising a vertically extending post vertically movable in said frame, an elongated shoe mounted on a horizontal pivot at the bottom of said post and a coiled spring biasing said post toward said conveyor, a continuous presser belt disposed above said conveyor and having its bottom run operating between said shoes and said conveyor, a continuous roller belt disposed between said shoes and presser belt, tracks on the bottom faces of said shoes and tracks on the inner faces of said presser belt engaged by the rollers of said roller belt, a laterally rigid strip extending longitudinally of said shoes and laterally interlocked with each of said shoes to prevent rotation of said shoes on the vertical axes of their posts.

13. In a machine of the character described, in combination, a work table, a longitudinally travelling conveyor belt operating in the top surface thereof, a frame rality of pressure members longitudinally disposed in said frame and each comprising a vertically extending post vertically movable in said frame, an elongated shoe mounted on a horizontal pivot at the bottom of said post and a coiled spring bearing on said post and biasing said shoes toward said conveyor, a continuous presser belt having its bottom run operating between said shoes and said conveyor, a continuous roller belt disposed between said shoes and said presser belt, tracks on the bottom faces of said shoes and tracks on the inner faces of said presser belt engaged by the rollers of said roller belt, and vertically flexible laterally rigid means interlocking said shoes longitudinally and preventing rotative movement of said shoes on the axes of their posts.

14. In a machine of the character described, in combination, a work table, a longitudinally travelling conveyor belt operating in the top surface thereof, a frame above said table, a plurality of presser members longitudinally disposed in said frame and each comprising a vertically extending post vertically movable in said frame, an elongated shoe mounted on a horizontal pivot at the bottom of said post and a coiled spring biasing said shoe toward said conveyor, a continuous presser belt having its bottom run operating between said shoes and said conveyor, a continuous roller belt disposed between said shoes and presser belt, tracks on the bottom faces of said shoes and tracks on the inner faces of said presser belts engaged by the rollers of said roller belt, and means for looking said shoes against rotation on the vertical axes of said posts.

15. In a machine of the character described, in combination, a work table, a longitudinally travelling conveyor belt operating in the top surface thereof, a frame above said table, a plurality of presser members longitudinally disposed in said frame and each comprising a vertically extending post vertically movable in said frame, an elongated shoe mounted on a horizotal pivot at the bottom of said post and a coiled spring biasing said shoe toward said conveyor, a continuous presser belt having its bottom run operating between said shoes and said conveyor, a continuous roller belt disposed between said shoes and said presser belt, and means for locking said shoes against rotation on the vertical axes of their posts for maintaining said shoes in longitudinal alignment.

GEORGE M. GUSTIN.

above said table, a plu-

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