US1863596A - Method of making double belts - Google Patents

Description

June 21, 1-932. w. s. GRIFFITH METHOD OF MAKING DOUBLE BELTS Original Filed Feb. 1. 1927 khzzw" Patented June 21, 1932 UNITED STATES PATENT OFFICE,

WINFRED-S. GRIFIEITH, F WORCESTER, MASSACHUSETTS, A SSIGNOR TO GRA'ION &

NIGHT COMRANY, 0F WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSA- CHUSE'I'IS mnrnon or MAKING DOUBLE BEL'rs Application filed February 1, 1927, Serial No. 165,215. Renewed November 6, 1981.

This invention relates to the manufacture of double belts and more particularly to the manufacture of double leather belts from two single plies or layers of leather.

It is the general object of my invention to provide a method of manufacture by which a multi-ply belt may be produced in a continuous operation. is to provide a method of manufactureby which a plurality of single layers of belt material maybe secured together under tension 1 by virtue of cellulose cementing material. -A

still further object of the inventionis to introduce a cellulose material between the assembled layers in the form of a continuous strip of uniform thickness.

The details of my improved method will be hereinafter described with reference to the illustrative drawing, and will be more fully set forth in the appended claims. In

the drawing, I have shown one form of machine by which my improved method may be carried out.

Fig. 1 is a side elevation, partly in section,

of the head or cementing end of a machine adapted for the carrying out of my improved method; andi Fig. 2 is-a similar view ofthe pressing and Winding portion of the machine, (Fig. 2 being a continuation-of Fig. 1 at the right hand end thereof). j

' Referring to the drawing, I have indicated, more or less diagrammatically, a machine in which two single-ply belt layers B and B are supplied from rolls R and R, rotatably mounted on fixed stands 10 and 11.

Any suitable meansis provided for apply- .ing friction to the belt layers B and B, and they are indicated in the drawing as being tensioned or retarded by ropes 12, passing 'over and wound around the axles of the rolls A further object guide roll 15 and between a pair of rolls 16,

which may be adjusted toward and from each other to apply additional tension to the downward along side a plate or table 18 to a lower guide roll 19.

The lower belt layer B passes between tension rollers 20, adjustable toward and from each other in the same way as the rollers 16, and then passes upward over an inclined I apron 21 tov a point adjacent theguide roll 19 previously described.

A strip S of celluloid is drawn from a roll 22 rotatably mounted in fixed bearings and preferably provided with a device for applying limited tension thereto. In the drawing, I have shown a rope or strap 23 resting on the roll 22. and drawn downward by a small weight 24;.

The celluloid strip S passes downward into a tank-'25 containing a solution adapted to soften the celluloid as the strip S is drawn therethrough. The strip is guided through the solution by guide rods 26 and 27 which cause the strip S to be submerged in the solution.

The moistened strip is delivered between the belt layers B and B adjacent the guide roll 19 and the three strips of material'hre drawn forward between a series of presser and tension rolls, by which the several layers are caused to firmly adhere to each other.

Preferably these rolls comprise successive pairs of semipositive tension rolls 30 and 31, one roll of each pair,'as 30, being :positively rotated, to turn.

Each-roll 30 is preferably a metal surfaced while the dther roll is free roll, while each roll 31 is preferably coveredwith rubberor other similar material.

Between the pairs of tension rolls, the assembledbelt passes through a series of idle presser rolls 33 and 34,- the rolls 33 rotating in fixed bearings andthe rolls 34 beingfree- .ly movable verticail'y, and both sets of rolls being freely rotatable.

The several driven rolls 30 are'simultaneously rotated in some convenient manner, as by a worm shaft 36 having worms 37 each ing. A belt cemented under tension is less by a worm 37 and worm wheel 38 as previously described. The roll 41 is geared directly to the roll 40 and is positively rotated thereby.

The belt is thus under tensionall the time from a point prior to the cementing operation until it passes the positively driven rolls 40 and 41. During this time rolling pressure is repeatedly applied thereto by the semi-positive tensions rolls 30 and 31 and by the idle presser rolls 33 and 34.

After passing the rolls 40 and 41, the belt is drawn under one or more edge-pressing devices, in each of which a series of narrow rolls 45 are yieldingly mounted upon springpressed bearing members 46 and engage the edges of the belt as it is drawn thereunder, a separate series of rolls 45 being provided for each edge of the belt.

After passing under the edge pressing rolls 45, the belt is drawn over a table 50, which maybe of any desired length to permit the cement to firmly set before the belt is wound up on the drum 51, which preferably has a friction connection to a gear 52 which is rotated from a worm shaft 53 positively connected for operation in conjunction with the worm shaft 36, previously described.

Any suitable driving mechanism may be provided for rotating the worm shafts, and the gear 52 is preferably rotated at such speed that it will always exert a frictional drag or pull upon the drumfil, thus placing additional tension upon the belt after it passes the positive tension rolls 40 and 41. This drag or pull upon the belt causes it to be wound tightly on thedrum, and each additional layer exerts substantial pressure upon the belt layers therebeneath previously wound on the drum.

Guide plates 54 are provided for keeping the belt properly aligned during the winding upon the drum. These guide plates 54 may be swung upward about a pivot 55 whenever it is desired to remove a roll of belting from the drum 51.

Having thus described my invention, it will be seen that I have provided a method of operation by which double or two-ply belt.- ing may be manufactured as a continuous operation, and furthermore that I have provided a method by which water-proof belting may be manufactured as a continuous operation and with the use of softened celluloid as the cementing material.

The matter of joining the layers together under tension has been found to be of very great practical importance as regards stretchsubject to stretch than a belt cemented without tension.

In the manufacture of high grade two-ply leather belting, it is desirable to preserve the full thickness of thehide in each layer and as this. thickness varies substantially in different skins, it is necessary to match the two layers as they are built up, so that at each point in the belt the combined thickness of the two layers may be kept substantially uniform. It is customary to place marks onthe layers at frequent intervals as they are matched up, and by slightly varying the tension on the layers the operator of my improved machine is able to keep these marks together as-the layers are cemented, thus producing a substantially uniform belt thickness from hides varying considerably in thickness.

lVhile I have described a diagrammatic form of machine adapted to carry out my improved method of process the method is not dependent upon the use of a particular machine and may be carried out in other machines or manually if so desired. It is essential, however, in order to obtain the best results, that the belt layers be under substantial tension during the cementing operation, and that pressure be promptly applied to the belt after the cementing material is'inserted between the layers and while the belt is still under tension.

While I have described the use of softened celluloid as the cementing material, many of the advantages of my invention may be attained with other forms of cementing material.

Having thus described my improved method and an illustrative machine for practicing the same, I do not wish to be limited to the details of the machine or otherwise,

claim is 1. The method of making double belt which consists in tensioning two single-ply belt layers, providing cementing material for the tensioned belt layers, assembling said layers and thereafter applying pressure to the assembled and cemented belt layers beyond the point of assembling and while still under tension.

2. The method of making double belt which consists in tensioning two single-ply belt layers, providing cementing material for the tensioned belt layers, assembling said layers and thereafter applying pressure to the assembled and cemented belt-layers beyond the point of assembling and while still under tension and as a continuous operation.

3. The method of making double belt which consists in tensioning two single-ply belt layers, providing cementing material for the tensioned belt layers, assembling said layers and material applying additional ed belt at a point beyond and remote from the point of assembling, and applying yielding pressure to said belt at a plurality of points layers and material, applying pressure to the assembled and cemented belt while still under tension, and applying additional pressure to the ed e portions only of the assembled belt.

5. The method of making double beltwhich consists in tensioning two single-ply belt layers, providing cementing material for the tensioned belt layers, assembling said layers and material, applying pressure to the assembled and cemented belt while still under tension, andvarying the relative tension upon thetwo single-ply belt layers to control the relative feed of said belt layers.

6. The method of making double belts which consists in tensioning two single-ply belt layers, feeding a cementing strip between the tensioned belt la ers, assembling said layers and strip and t ereafter applying pressure to the assembled and cemented belt layers beyond the point of assembling and while still under tension.

' 7. The method of making double belts which-consists in tensioning two single-ply belt layers, feeding a strip of softened cellulose material under tension between said tensioned belt layers, assembling said layers and strip and thereafter applying pressure to the assembled and cemented belt layers beyond the point of assembling and while still under tension and as a continuous operation.

8. The method of making waterproof double belt which consists in tensioning two single ply belt layers, softening a strip of cellulose material by the action of a solvent and inserting same after. the softening between the tensioned belt layers, assembling said layers and strip and applying pressure to the assembled belt layers and cellulose material beyond the point of assembling and while still under tension, all as a continuousoperation.

9. The method of making water proof double belt which consists in tensioning two single ply .belt layers, softening a continuous strip of cellulose material b the action of a solvent and inserting same between the tenstrip and applying'continuous rolling pressure to the assembled belt layers and cellu lose material beyond the point of assembling and while still under tension.

10. The method of making double belts between the tensioned belt layers and assembling the layers at the pointof insertion of a rolling pressure to the assembled belt at points beyond the point of assembling and applying additional pressure and additional tension to said belt beyond the points ofapplication of rollin pressure.

11 The metho of making double belts WhlCh consists in tensioning two single ply belt layers, inserting a cementing material between the tensioned belt'layers and assembling the layers at the pointof insertion of the cementing material, thereafter applying a rolling pressure to the assembled belt at points beyond the point of assembling, and applying additional pressure to'the edge portions only of the. assembled belt.

12. The method of making double belts which consists in tensioning two single ply belt layers, inserting a cementing material between the tensioned belt layers and assembling the layers at the point of insertion of the cementing material, and thereafter applying asemi-positive tension followed by a rolling pressure to said assembled belt beyond the point of assembling. H

13. The method of making waterproof double belts which consists in tensioning two single-ply belt layers, inserting and assembling therebetween a layer of cellulose cementing material, and applying pressure to the assembled belt layers and cementing material beyond the point of assembly and while still under tension, all as a continuous operation.

14. The method of making waterproof double belts which consists in tensioning two single-ply belt layers, inserting and assembling therebetween a continuous layer of cellulose cementing material, and applying continuous rolling pressure to the assembled belt layers and cementing material beyondthe point of assembly and while still under tension.

In testimony whereof I have hereunto afiixed my signature.

' WINFRED S. GRIFFITH.

sioned belt layers, assembling said layers and the cementing material, thereafter applying

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