US 2135763 A
Description (OCR text may contain errors)
Nov. & N38. F. A. NICHOLSON 2,135,763
ENDLESS TRAVELING PLATEN FLUID PRESSURE PRESS Filed Nov. 1:5, 1935 s SheeiZs-Sheet 1 w INVENTQR h fiefickJi/Mkkadsm 11 I I ATTORNEY Nov. 8, 1938.
F. A. NICHOLSON 135,763
ENDLESS TRAVELING PLATEN FLUID PRESSUREPRESS Filed Nov. 13, 1955 5 Sheets-Sheet 2 EI'HWWMM we,
qn n" ""57" 5 3 7 42 4 3/ Y fizfr 35 '7 A v v 32 I as - 42 if; 3/ 35 4% /Y Y INVENTQR Nov. 8, 1938. F. A. NICHOLSON 2,135,753
ENDLESS TRAVELING PLATEN FLUID PRESSURE PRESS Filed Nov. 13, 1955 s Sheets-Sheet 3 52 $3 T 5 (r: s.
- l INVEINTOR Q I? adezzc g fl/Waflo/sm ATTORNEY Patented Nov. 8, 1938 UNITED STATES ENDLESS TRAVELING rmrnn rum) rans- SURE mass Frederick A; Nicholson, Seattle, Wash. Application November 13, 1935, Serial No. 49,547
my invention is particularly useful where heat' and pressure are used in processing compounds called plastics, or where heat or pressure or both are simultaneously used to remove water from or otherwise treat products, for example sheets of pulp or wood fibers, or plastics.
It is an object of the invention to provide a pressing device where a fluid such as steam may 20 be used to provide the pressure urging a traveling platen in one direction and at the same time to utilize this pressure producing medium as the heating medium.
It is an object of my invention to provide a press device which is particularly applicable for use in connection with a continuous process for producing plywood where dry glue is used.
An object of my invention is to provide a machine wherewith the materials to be pressed can 30 be introduced into one end of it and move continuously or progressively through it while being subjected to "the required pressure or heat, or pressure and heat, and thus form a steady stream of production into and out from the machine. This mode of operation is to be distinguished from the commonly practiced method wherein the layers of material are placed between the stationary platens of a press and there subjected to the required pressure and then removed after the platens have been drawn apart.
' Another object of my invention is the provision of a plurality of longitudinally spaced fluid pressure chambers positioned directly against a traveling platen permitting products, traveling through the machine, to be successively subjected to a plurality of pressures, temperatures, or pressures and temperatures.
Another object of my invention is to provide continuously traveling platens which provide a substantially uniform pressure, cross sectionally considered, on the articles which are run through the machine. This permits an entirely new use of an endless platen press and permits the use of such a device on plywood and the like where such uniform pressure is necessary to provide a uniform glue bond.
Another object of my invention is the production of great unit surface pressure, or such pressure and heat, on material between traveling 5 platens with very low mechanical friction between the traveling platens and the supporting means therefor.
Another object of my invention is to provide continuously operated means for moving together it complementary parts of traveling moving dies and to provide the desired temperature and pressure to such dies,
In general, I attain these objects by having two endless flexible traveling belts, such as metal 15 belts, arranged to run with their adjacent outside faces substantially parallel and separated by an amount determined by the thickness of the material being treated, and having fluid pressure chambers or pans positioned directly against equal portions of the belts on their surfaces opposite their adjacent sides with the joint between the edges or rims of the chambers and the belts sealed with flexible packing; thus when steam, water, air, oil or other fluid is introduced in the chambers the belts will be thrust toward each other exerting uniform pressure on material introduced between them while they may at the same time be traveling across the chambers with no more friction between the belts and their supporting means than that produced by the packing and the fluid in the chamber,
The above mentioned general objects of my invention, together with others inherent in the same, are attained by the devices illustrated in the following drawings, the same being preferred exemplary forms of embodiment of my invention, throughout which drawings like reference numerals indicate like parts:
Figure 1 is an elevation of the machine with part of the side of the pressure chambers cut away for a sectional view;
Fig. 2 is aview with parts shown in end elevation and parts sectionalized on the line 2-2 in Figure 1, to expose the chambers and packing means;
Fig. 3 is an enlarged fragmentary sectional view substantially on broken line 3-3 of Figure 1 of packing or sealing means positioned between the edges of fluid pressure chambers and traveling belts;
- Fig. 4 is a detached fragmentary plan view of the packing means as it might appear with the packing strip removed;
Fig. 5 is an enlarged fragmentary vertical sectional view through the packing or sealing means at one side of the machine;
Fig. 6 is a view similar to Fig. 5 showing a means which may be used for closing the space between the edges of two traveling belts;
Fig. '7 is a fragmentary sectional view showing an alternative form of packing means;
Fig. 8 is a longitudinal sectional view of a modifled form of my invention, showing a plurality of longitudinally spaced fluid pressure chambers positioned directly against a traveling platen, with parts being omitted or broken away for the purpose of clearness;
Fig. 9 is a longitudinal sectional view of a modified form of my invention showing fluid pressure means directly against a traveling platen used in combination with a mechanically supported belt, parts being omitted or broken away for purposes of clearness; and
Fig. 10 is a longitudinal sectional view of a still further modified form of my invention illustrating my invention adapted to be used with complementary parts i of traveling dies urged together and attaining desired temperatures by fluid pressure means.
Referring to Figure 1 of the drawings, the frame of the machine may comprise a casting I, together with the four attached legs 3. The four screws 4, each having two thrust collars 5, 5 fixed thereon and free to rotate in the bearings formed by lugs 2, are threaded through four lugs 6 which are integral with the casting 1. Two bearing brackets 8, 8 are secured to one end of each of castings l and! to support the shafts 9, 9 on which are mounted the pulleys I0, l and the drive sprockets II, II. To the opposite ends of each of the castings I and l are secured two brackets l2, l2 each of which supports a hinged bearing l3 in which may rotate the shafts l4, l4 carrying the pulleys l5, IS. The four brackets i2 are arranged near their bases to form a seat for one end of the compression springs I 6, which are adjustably seated at their opposite ends against the hinged bearings [3.
The traveling endless belt, such as metal belt i1, is supported by the two upper pulleys l0 and i5, and the traveling endless metal belt I8 is supported by the two lower pulleys l0 and I5. Proper tension of the belts l1 and I8 is secured by means of the springs l6 against the hinged bearings I3, which are free to swing on the pivots l9, thus allowing the pulleys i to move longitudinally of and tighten up the belts I1 and I8.
Sprockets H, II are mounted on shafts 9, 9. An endless driving belt, for example a chain 20, is led around the upper sprocket H and the small driving sprocket 2|. The sprocket 2| is attached through a suitable speed reduction device 2| to a source of power, as electric motor 22. The sprockets and chain are so located as to cause the lower side of the chain 20 to engage teeth on lower sprocket It, thus causing the sprockets ll, Ii to rotate in. opposite direc tions when power is applied and driving the belts H, I 8 through the shafts 9, 8 and pulleys I 0, I0, the adjacent facesof the belts movingforward at the same rate, in the direction of the arrows.
Each of the four rotatably mounted screws 4 is preferably provided with a relatively fine thread of small pitch and each of the screws 4 has secured on its lower end one of the similar worm gears 23.' Each of the worm gears 23 meshes with one of four similar worms 24. The
worms 24 are mounted on the respective ends of.
and are driven by-the shafts 28, 25, which shafts are journaled in the four bearings 28 secured to the casting I. (See details shown in section in Fig. 2.) The sprockets 21, 21 of equal size are attached to adjacent ends of shafts 25, 25.
Each of the sprockets 21- is connected to one of l the sprockets 28 by means of an endless belt, as a chain 30. The sprockets 28 are connected to a suitable source of power as reversible motor 29. Thus the screws 4 may be turned and by means of threads of the four lugs 8 engaging with screws 4, the lugs 8 and the whole upper section of the machine supported thereon comprising the casting I and equipment mounted thereon may be raised or lowered at will through application of power 28 in the desired direction, by means of the transmission mechanism described, making it convenient to obtain rapid and minute adjustment of the opening between the adjacent parallel faces of the belts l1 and [8.
Referring to the part of Fig. 2 cut away in section, the castings l and I will be seen to have their opposite adjacent portions similarly recessed to form fluid pressure chambers 47 and 48, except that ribs or bars 42 are arranged across the chamber in casting i and have their sides level with the top of casting I thus forming a flat support against the under surface belt i8. Both castings l and 'l have their edges around the four sides of the fluid pressure chambers 41 and 48 arranged in relatively close spaced relation with opposite surfaces of the belts l8 and I1 respectively. The belts i8 and il comprise adjacent sides of the fluid pressure chambers 41 and 48.
Continuously around the edges of castings I and l are block retaining means in the nature of the channels 3|, 3| in which are placed a series. of blocks 32 (shown in Figs. 1 to 6, inclusive) interlocking by means of the transverse tongues and grooves 33 as shown in plan in Fig. 4, but free to move vertically and urging the fibrous packing material 34 into contact with the belts H and [8 from the effect of pressure, as of the leaf springs 35 acting between a wall of the channels 3i and the blocks 32. Each spring may be connected with its companion block by means of the dowels 36. Such structure permits any fluid which may escape from the fluid pressure 'chambers 41 and 48 into the channels 3| to augment the pressure of springs 35 in urging the packing 34 against the belts and forms a flexible seal entirely around the edges of and enclosing the said fluid pressurechambes. The packing material used is preferably high pressure packing material, the exact nature depending upon the fluid and temperature used and may be fabric impregnated with molded rubber or gutta percha, graphite, leather or other well knownpacking material.
The blocks 32, fibrous material 34 and springs 36 may comprise only one, form of suitable sealing means, therefore I do not wish to confine myself to this'sealing means alone.
Another form of packing means is shown in Fig. 7, where a channel 43 is used in place of the channel 3| shown in the preceding flgures. A plurality of blocks 44 in said channel 43 are urged toward the traveling belts, as belt l1, by means of springs, as compression spring 45. A substantially L shaped packing means 48, which functions similar to an ordinary cup leather is secured to the blocks 44. The fluid pressure in the chambers, together with the pressure of used. 7
springs, maintains a fluid seal between the packing'means l6 and the traveling belt II.
In Fi 6, 38 represents a section of an angle bar which may be secured to casting I and project between both edges of belts I! and II forthe purpose of permanently separating the belts at their edges, and also, to confine soft materials being processed to a limited width.
Referring again to' Figure 1, the inlet pipes 81, 31 communicate with the fluid pressure chambers 48 and 41 formed between belt I! and casting 1 and between belt l8 and casting I, respectively, and may have their opposite ends connected to a regulated and controlled sourceof fluid pressure.
If the products being run through the machine require a predetermined temperature during pressing, an outlet pipe 39, 36 shown in Figure 1 may be added tothe chambers and a fluid of desired temperature may be continuously circulated through the chambers under pressure sufllcient to develop between the belts the required pressure, thus permitting the fluid pressure medium to be utilized as the heat producing medium.
Should the materials being treated have a tendency to buckle or distort out of a plane, this may be overcome by adjusting the pressure in the chambers or the pressure in the lower chamber may be reduced below that in the upper chamber by an amount necessary to cause belt i8 to lie against the level surfaces of the bars 42 in Fig. 2.
In Figure 1, 4B is an object to be pressed by my machine and may be, for example. a unit consisting of a plurality of sheets oi wood veneer with lue in dry powder form spread over the joints between the sheets. .With the belts traveling at the desired rate, a method of operation may be to feed the unit in between the traveling metal belts where suflicient. heat will be encountered to melt and solidify the glue and simultaneously sufficient pressure between the belts, (in this case approximately 170 lbs. per square inch. has been found practical) will bring the fibers of the veneer into that intimate contact essential to producev an economical and permanent joint. The materialleaves the machine as at 4| completely finished. My device is particularly useful for use in such a process as the device permits uniform pressure and heat, thereby providing a uniform glue bond free from weakened sections and at the same time provides for a continuous process. In specifically pointing out the applicability of my invention for use in pressing veneer using dry glues, it is not to be inferred that my device is not qually useful where wet glues are gitudinally spaced fluid pressure chambe s areshown, rather than the single fluid pressure chamber shown in the preceding figures. For that reason, and in the interest of simplic ty. much of the supporting means is broken away and the description will be generally limited to such novel features. A plurality of longitudinally spaced fluid pressure chambers 5| are disposed directly against endless traveling platens 52.
Fluid pressure packing 53 surrounds the edges of the fluid pressure chambers 5i. Preferably .ing platen, similar to the inlet pipes 64 and outlet pipes 66 connect each chamber with a separate suitable source of fluid pressure not shown. By providing a plurality oi chambers, each of which is connected to a separate source of fluid pressure, each chamber may be subjected to the desired pressure and temperature and the productv traveling through the machine may be successively subjected to a plurality of pressures, temperatures, or pressures and temperatures. Such apparatus permits a product to be successively subjected to a plurality of temperatures and pressures, or temperature or pressure so that the product may leave the machine completely processed.
Referring to Fig. 9, I have illustrated a modification of my invention, where only one endless traveling platen receives its pressure from a fluid s u e g res-and endle traveling platen lisfmechanicall'y supported. The endless traveling platen 56 is supported in a manner similar to the endless traveling platen i1 shown in Figure l of the drawings. A'fiuid pressure chamber 51 is positioned directly against such travelchamber 48 in Figure 1. Fluid pressure packing 58 surrounds the edges of the chamber 51 the edges of thechamber and the endless traveling platen 56. Anendless link belt 59 may be in the form generally used in mechanical pressure devices employing traveling belts. This link belt is supported by sheaves 60. Preferably rollers 6! are rotatably mounted on the inside of the link belt 59 and serve asantifriction means in supporting the link belt 59- on the bed plate 62. To provide a continuous support which will be uninterrupted by spaces between. the links, I preferably provide an endless metal belt 63 directly over the link belt 59. This metal belt 63 may be supported on sheaves 64. The above embod ment illustrates the use of a single metal traveling belt which forms one wall of a fluid pressure chamber used in connection with mechanical means supporting a product while traveling adjacent said endless platen.
Referring particularly to Fig. 10, I have shown a still further modification of my invention where endless traveling platens 65, form a wall of fluid pressure chambers 66 and are provided with fluid pressure packings 61, all in accordance with the preceding figures. Complementary parts 68 and 69 are supported respectively by chains and H. Chains 10 and H are mounted for rotation on sheaves 12, i2 and 13, 13, respectively. The chains 10, H and platens 65, 65 may be driven by means such as illustrated in Figs. 1
and 2 of the drawings, and in the interest of brevity are not here shown. A plastic requiring heat and pressure in processing the same may be inserted into the parts 68. As the chains 10 and 'il move synchronously through the device the complementary parts 68 and 69 are properly positioned and fluid pressure in the chambers 66 urges such members toward each other and the desired temperature may be simultaneously applied so that the plastic in traveling through the machine will be subjected to the desired temperature and pressure and be delivered from the machine in completed form, at the right hand end of the machine as respects the showing in Fig. 10.
In the event phenol condensation products are processed in the apparatus shown in Fig. 10, a plurality of spaced apart chambers 66 will be useful to successively subject the product to a plurality of pressures, temperatures, or pressure and forms a fluid seal between ing with said belts fluid pressure enclosing chambers, said means being positioned directly against corresponding opposite areas of the belts.
2. In a pressing machine, traveling belts forming opposing platens, means forming with said belts fluid pressure enclosing chambers, said means being positioned directly against corresponding opposite areas of the belts, and flexible sealing means positioned between the edges oi the chamber forming means and the belts.
3. In a pressing machine, two similarly traveling belts forming opposed platens, means forming with said belts fluid pressure chambers, said means being positioned directly against equal opposed surfaces of the belts, means sealing the edges. of the chamber forming means against the belts, and means to change the distance between the belts.
4. In a pressing machine, a traveling belt,
means forming with said belt a fluid pressure en-' closing chamber, said means being positioned directly against said belt, sealing blocks, block retaining means, packing material between said scaling blocks and said traveling belt, and spring means urging the said sealing blocks and packing material thereon against said traveling belts.
5. In a pressing machine, a traveling belt,
means forming with said belt a fluid pressure enclosing chamber, said means being positioned directly against said belt, a plurality of sealing blocks operatively positioned between the belt and the chamber forming means and having interlocking tongue and groove connections, and block retaining means.
6. In a pressing machine, a traveling belt, means forming with said belt a fluid pressure enclosing chamber, said means being positioned directly against said belt, means forming a sealing receptacle adjacent the edges of the chamber forming means, a plurality of rows of sealing blocks having tongue and groove connections with each other extending transverse of the blocks in said receptacle, packing material between said sealing blocks and said traveling belt, and means urging the said sealing blocks and packing material thereon against said traveling belts.
7. In a pressing machine, a traveling belt, means forming with said belt a fluid pressure enclosing chamber, said means being positioned directly against said belt, means forming a sealing receptacle adjacent the edges of the chamber forming means, sealing blocks in said receptacle, packing material between said sealing blocks and said traveling belt, and spring means bearing upon said blocks urging the said sealing blocks and packing material thereon against said traveling belts.
8. In a pressing machine, traveling belts forming opposing platens, means forming with said mamas belts fluid pressure enclosing chambers, said means being positioned directly against corresponding opposite areas of the belts, and means longitudinally extending on each edge of the belts for restraining material being pressed from escaping transversely of the belts.
9. In a pressing machine, an impervious metallic traveling belt forming a relatively high pressure pressing platen; means forming with said belt a fluid pressure enclosing chamber for retaining fluids under relatively high pressures operable directly against one face of said belt; and means supporting a product to be subjected -to relatively high pressures in operative position as respects the opposite face of said belt and for traveling movement therewith.
10. In a pressing machine, an impervious traveling belt forming a pressure platen; means forming with said belt a fluid pressure enclosing chamber, said means being positioned directly against one face of said belt; a plurality 01 sealing blocks operatively positioned between the belt and the chamber forming means; block retaining means; and means supporting a product to be pressed in operative position as respects the opposite face of said belt.
11. In a pressing machine,'an imprevious metallic traveling belt forming a relatively high pressure pressing platen; means forming with said belt a plurality of longitudinally spaced fluid pressure enclosing chambers, for retaining fluids under relatively high pressures operable directly against one face of said belt; means supporting a product to be subjected to relatively high pres sures in operative position as respects the opposite face of said belt and for traveling movement therewith; and means adapted to connect. each of said chambers with a suitable source of fluid under pressure at the desired temperature, whereby material to be pressed may be subjected toa plurality of pressures and temperatures.
12. In a pressing machine, an impervious metallic traveling belt forming a relatively high pressure pressing platen; means forming with said belt a plurality of longitudinally spaced fluid pressure enclosing chambers for retaining fluids under relatively high pressures operable directly against one face of said belt; means sealing the edges of the chamber forming means against said belt; means supporting a product to be subjected to relatively high pressures in operative position as respects the opposite face of said belt and for traveling movement therewith; and means adapted to connect each of said chambers with a suitable source of fluid under pressure at the desired temperature, whereby material to be pressed may be subjected to a plurality of pressures and temperatures.
13. In a pressing machine, an impervious metallic traveling belt forming a relatively high FREDERICK. A. NICHOLSON.