US1632750A - Drier for sheet material - Google Patents

Description

Jun 14, 1927.

A. 'J. VANCE DRIER FOR SHEET MATERIAL Filed Aug. 1, 1924 2 Sheets-Sheet 1 une 14, 1927.

A-J. VANCE DRIER FOR SHEET MATERIAL Filed Aug. 1, 1924 2 Sheets-Sheet 2 I! g lrmf IIII "Hill 6",

" mama June 14,1927.

I 1 UNIT -o STAT-ES PATENT OFFICE,

I'v'F'AIN'GE, OI PAIN'ESVILLE, OH IO, ASSIGNOR TO THE (JOE MANUFACTURING 001mm, PAINESVILLE, OHIO, A CORPORATION 01' OHIO.

' Damn. son snas'r newsman.

Application filed August 1, 1m. Serial mi. 72am.

This invention relates to driers of veneers and the like wherein the material under treatment is conveyed through the drier by means of a series of pairs of rollers;

' l More especially the invention relates to roll supported mechanism and conveyor rolls for such driers. I

In driers of this kind it has been com.- men-to support the conveying rollsin even- 1y spaced pairs, the upper rolls bein free to rise and fall to accommodate the di erent thickness of material being treated. Furthermore, such driers are usually provided with an inner roll supporting frame having 1;! spaced vertical side members which carry oppositely dis osed connecting bars wherein are formed a-rings for-:the roll journals. Heretofore these bars have been commonly of channel cross section having U-shaped slots extending downwardly. from the upper 'part and surrounded by suitable flanges, the bar also having journal openings in the lower part surrounded by annular flanges. Since the distance between the ll centers of the conveyor rolls of each pair .'s controlled, at its minimum, b the roll diameters and the bottom flange o the channels is usually level with the bottom of the lower bearing flanges, these supporting bars have considerably more material than is necessary for the purpose and consequently are'excessive in weight.

' Moreover, it is possible, by careless feeding of the veneer, to lap the edge of one sheet over the edge of another sheet. Should this lap occur near the middlemof the length of the rolls, the unusual thickness between the rolls at this point may cause the lighter end of the top roll to rise sufliciently for its journal to'get out of the U-shaped .slot. In

addition to this the even spacing of the pairs of rolls tends to cially when the material is of a composition such as is used in the manufacture of fiber arrang'ements and to improve the construc- 00 tion of such conveyors by providing a form of roll supporting bar wherein thematerial cause corrugations in. some of the materials passed between them, espeyin be reduced to a practical minimum 1n weight while retaining all necessary strength, the rolls will be so spaced as to.

constructed in accordance with this inven.-.

tion.

Figure 2 is a transverse section therethrough.

Figure 3 is a plan view on an enlarged scale of one of the roll bearing bars.

Figure 4 is a sideelevation of such a bar. Figure 5 is. a side-elevation of a modified form of bar, arranged for preventing corrugation. Y

Figure 6 is an end view thereof. Figure 7 is a section on the line 7-7 of Figure' l.

Figure 8 is a detail showing a pair of improved rolls for use herewith. Figure 9 is an'enlarged detail showing the top roll retaining bar.

Figure 10 is a transverse section through a pair of felt covered'rolls.

Any suitable form of construction may be .used to support the roll bearing bars, the

improvement in the construction of which is one of the essential features in this inven- I tion. For instance, a conveyor frame may be constructed havln vertlcal members 1Q disposed o posite eac other and connected by longitu mal members 11 supporting theheater coils 12. The rolls are-shown as ar ranged in pairs, the lowerroll of each pair being indicated at Iii/and the upper at 1A.. These rolls are provided with ournal ends 15 and 16 respectivelfvi Each of the roll bearin bars is prefera y formed as a sin le unit 0 cast or pressed metal and is provi ed' with'a web 17 and a bottom flang 18, the

bottom flange .inclinin upwardly from the center toward both en s sothat the web decreases in height from the center toward said' U-shaped journal receiving slots 19. surrounded by reinforcing flanges 20 and the depth of these slots is considerably greater than the width so that the upper journals 16 held therein may slide vertically thus enabling the rolls of each pair to vary in distances between centers and'accommodate different thicknesses of the material being treated. As previously mentioned this material may be carelessly fed at times so that the material overlaps near themiddle and causes the upper journals 16, if not prevented, to lift entirely out of the slots 19. To avoid this certain of the flanges 20, pref erably the end flanges, are laterally extended as at 21 andprovided with threaded openings 22 to receive the bolts 23 which secure a hold down or cover plate 24 to the top of the roll bearin bar thus covering in all of the upper bearing slots. Below each of the upper bearing slots the bar carries a tubular flange 25 and the center flange is so positioned that the flange 18 merges into its bottom portion. These flanges 25 have their centers in horizontal alinement and by this means the portions of the flange 18, be tween the bearing flanges 25, intersect these flanges at points which gradually become higher as the ends of the bar are approached; The upper and lower flanges are preferably connected by short ribs 26. At each end the bar is provided with bosses 27 having openings 28 for the reception of bolts 29 by which the bearing bar is secured to the up-i rights 10.

In the form of the device as shown in Figure 4 it will be seen that the spacing of the pairs of rolls is uniform, that is to say the distances longitudinally of the bar be-- tween the adjacent hearing centers are uniform. In treating certain material such uniform spacin tends to produce corrugation and it is ound that by having a set, or sets, of ,roll hearing bars located at a place in the length of the drier when the material at; be dried is in $112; conditiiolil to be set, or t e permanent pe, an aving spacing of the rolls in said bearing bars irregular and unequai in distance from center to center as shownin Fig. 5, such corrugating is prevented it will be obvious, of come, thatavhatever spaces are adopted the bearings ('in'one sideef the conveyor will be spaced in conformity with the"bearings on the other sideJ-It will be noted that the lower bearing openings are larger than theupper, this being for the purpose of permittingrollerbcaringsafltobensed.

While the rolls shown in Figure 1 are uniform throughout the length certain cases arise where it is advisable to use an upper roll such as is shown in Figure 8 wherein it will be seen that the center portion of the upper roll is reduced as at 31 to provide end flanges 32 which rest on the lower roll 13, the engagement being at the ends of the body of the lower roll. Preferably these flanges 32 are of the same diameter as the body of the roll 13. The effect willbe the same by having the body of the upper roll 31 of the same diameter asthe lower roll 13 and having the flanges 32 of greater diameter than either roll and dispense with the gears, or star wheels, on these two rolls, driving the top roll by friction through the flange. When this type of roll is used the material passing through does not lift the upper roll, the function of the latter then being a guide to the material to be dried and to prevent the air currents from lifting the material off the lower rolls.

lVith the arrangement here shown and described material used in the roll supporting bar is so distributed that the necessary strength 'is obtained without undue weight, the corrugating of the material being treated is eliminated, and the upper rolls are prevented from jumping out of their bearings.

Another special type ofroll' is shown in Figure 10, where 13 is a metal lower roll, of any pair, covered with felt 33, and 14 is its corresponding top roll, covered with felt 34. Some materials which would be damaged by actual contact with the metal surface of the rolls can be passed between felt covered rolls without injury. Furthermore, the felt having a great capacity for absorbing moisture, rapidly extracts the moisture from the material at the point of Contact, and as the rolls revolve, the felt gives up its moisture to the currents of warm air. This action will insure more rapid "drying of materials that must be dried in comparatively low temperatures.

Changes in this specific form will be obvious to engineers, such changes being entirely within the scope ofthe present invention so it is not desired to limit the invention to this precise form but rather it is desired to include all such as properly come within the scope claimed.

Having thus described the invention, what is claimed as new, is:

1, A conveyor roll bearing bar havin a web'provided with horizontal u per e ge portions interrupted at interv by U- shaped journal slots each having a reinforcing flange therearound, tubular bearing flanges carried by the lower portion of said web, said web being deepest at its central portion and gradually lessening in depth toward the ends, said tubular bearing flangesatthecenterofthebarhavhigtheir lower parts flush with the bottom of-the I web, and bottom flange portions at said lower edge connectin the tubular flanges. I

2. A roll bearing ar having transverse ferent from the 5 journal receivin openings spaced longi- Odistances.

tudinally of the ar, the distances between centers of ad'acent openinis being unequal.

3. A roll aring bar aving transverse tance between a journal receiving openings spaced longitudinally of the bar each center to center disdjacent openings being difvremaining; center to center In testimony whereof I aflix my signature.

ARTHUR J. VANCE.

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