US1741106A - Method of preparing leather belting for gluing or cementing - Google Patents

Description

Dec. 24, 1929. w. s. GRIFFITH 1,741,105

METHOD oF PREMRING LEATHER. BELTING Fox GLUING oa CEMEN'HNG Filed May 14. 1928 2 Sheets-Sheet l Dec. 24, 1929. w 5 GRlFFlTH 1,741,106

METHOD OF PEPARING LEATHER BELTING FOR GLUING 0R CEMENTING Filed May 14, 1928 2 Sheets-Sheet 2 Patented Dec. 24, 1929 UNITED STATES PATENT OFFICE WINFRED' S. GRIFFITH, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO GRATON &

KNIGHT COMPANY, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSA- CEIUSETTS METHOD OF PREPARING LEATHER BELTING FOR GLUING OR CEMENTING Application led May 14, 1928. Serial No. 277,751.

This invention relates to a method of preparing leather belting to receive glue or cement, particularly in the manufacture of double belting. It is essential that all of the 4 5 fleshy material be removed from the belt and that the entire ieshy side of the belt be uniformly roughened before the cementing material is applied. This work has been heretofore commonly performed by the use of hand scrapers and by the use of hand brushes or cards, a very laborious operation.

It is the object of my invention to provide an improved and novel process of preparing belts for cementing in which process the 15 leather is subjected to a series of scratching,

skiving and brushing operations, which may be much more rapidly and economically performed than the old method above set forth.

In the preferred method of practicing my invention I also provide for reducing the laps in the belt to uniform thickness in addition to removing the fleshand brushing the surface.

My invention further relates to the sequence of operations hereinafter set forth and more particularly pointed out in the appended claims.

Mechanism suitable for the practicing of my invention' is shown in the drawings in which A Y Fig. 1 is a sectional end elevation of a scratching machine for performing the first step in my improved method;

Fig.2 is a detail perspective view of a portion of a belt after the scratching operation has been performed;

Fig. 3 is a sectional end elevation of a skiving machine for reducing the laps to uniform thickness;

Fig. 4 is a partial perspective view of a portion of the belt after the skiving of the lap has been performed;

Fig. 5 is a sectional end elevation of a second skiving machine adapted for removing y the fleshy material which has been raised on the surface of the belt by the scratching machine;

Fig. 6 is a detail perspective view of a portion of the belt after the fleshy material has been removed therefrom;

Fig. '7 is a perspective view of a portion of an inspecting table over which the belt preferably passes for purposes to be described, and

Fig. 8 is a sectional end elevation of a sec` 55 ond scratching or brushing machine by which the flesh side of the belt is given a uniformly roughened or brushed surface.

Referring first to Fig. 1, I have indicated a skiving machine comprising' a frame 10 in 60 which a feed roll 11 is rotatably mounted.

A second roll 12 is freely rotatable in bearing blocks 13 above the feed roll 12. The blocks 13 may be raised or lowered by adjusting nuts 14e on studs 15, mounted in the bearing 65 blocks 13 and the blocks 13 are held yieldingly downward by springs 16. The feed roll 11 preferably has a leather covering 17 and the feed roll 12 preferably has a rubber covering 18.

A brushing or scratching` roll 20 is mounted on a shaft 21, rotatable in bearings in the frame 10, and is preferably provided with a peripheral covering 22 of card clothing. The shaft 21 and roll 2O are rotated at high 75 speed in the direction of belt travel, and the feed roll 11 is driven from the shaft 21 at relatively .slow speed.

A series of presser fingers 23 are mounted on a cross rod 24 supported in brackets 25, 80 which are secured to a cross bar 26 and are positioned by bolts 27, fixed in said cross bar and extending through a fixed bearing 28 in the frame of the machine.

Springs 30 encircle the bolts 27 and move 85 the cross bar 26 and brackets 25 as far to the right in Fig. 1 as is permitted by the wing nuts 29 on the bolts 27.

The fingers 23 are limited in downward movement-by the heads of screws 33 threaded 90 into the cross bar 26 and the fingers 23 are held in yielding contact with the heads of the screws 33 by springs 35 mounted in said screws. Hardened steel discs 36 are preferably mounted in the lower faces of the presser fingers 23, to form contact members for the upper or grain face of the belt B. Front and rear supporting tables 37 and 38 are provided for guiding the belt through the machine.

As the belt is fed slowly through the machine by the feed rolls 11 and 12, the rapidly rotating card clothing on the scratching roll 20 tears up the soft fleshy material remaining on the flesh side of the belt and causes'it to stand out loosely from the lower face of the belt. Y

The belt B then passes to a skiving'niachine (Fig. 3) comprising a table 40, a iiXed knife 41, a presser roll 42 having bearing portions 43 rotatable in eccentric openings in discs 44, provided with gear teeth 45 on their periphery.

The teeth 45 are engaged by an idle gear 46 which in turn is actuated by a gear 47 mounted on ashaft 48 having a handle 49 secured thereto. The roll 42 is preferably covered with a substantial thickness of soft rubber.

The eccentric bearing member 44 has an Vupwardly projecting portion 50 to which a spring51 is attached, which `will restore the roll 42 to raised position as soonas the handle 49 is released. As the belt B is drawn along over the table 40 and over the skiving knife 41, the soft rubberroll `42 engages the upper surface of the belt and is available to press the same y'ie'ldingly downward.

` Whenever a splice in the belt approaches, it is Vnecessary to apply pressure to the belt -to skive thelap, which is accomplished by Vmanually rotating the eccentric bearing 44 vby means of the handle 49, thus lowering the presser roll 42 and placing sufficient pressure on the belt to cause the leather to 'be skived off to substantially uniform thickness, as indicated vin Fig. 4.

A second skiving machine (Fig. 5) may be positioned adjacent but beyond the skiving machine above described, and this second'machine comprises a table 52 having a skiving knife 53 mounted therein and a presser roll 54 mounted'in vertically slida'ble vbearings 55 and held yieldingly downward byl coil springs 56. As the belt B passes under the presser roll 54 it is pressed downward,

v sary. It is considered preferable, however, 'Y to use the second skiving machine indicated in Fig. 5, leaving the mechanism shown in Fig. '.3 for evening the laps and setting the second mechanism permanently at the right adjustment for skiving off the fleshy material.

After the belt B leaves the skiving machine in the condition indicated in Fig. 6, it preferably passes over an inspecting table 60 (Fig.

looped. so that it will pass twice in succession through one or more of the different machines.

Having described forms of mechanism suitable for .carrying out my improved operation, the method is as follows: f

The belt is introduced between the feed rolls 11 and 12 of the first scratching machine, as indicated in Fig. 1 and the card clothing 22 tears up the soft fleshy material'and causes it to stand out from the lower face of the".

belt. rlhe independent presser fingers cause all portions of the beltto be pressed yieldingly and uniformly against the brushing or scratching cylinder, regardless of variations in the thickness of the belt.

AThe belt then passes through the skiving machine, which maybe set to skive off the fleshy material and which is provided with means for lowering the presser roll to exert increased pressure on the belt as a lap is".

drawn over the knife 41. Instead of using the knife 41 and roll 42 for both skiving off the fleshy material and also for evening ythe laps, I may-use this mechanism for the Vlatter purpose only, providing a second skiving" inechanism as above described for skiving ott the fleshy material as indicated in Fig. 5.

The belt is then drawn over the inspection table 60, permitting manual removal lof any fleshy materialescaping the operation of the 1110 scratching and skiving mechanisms, and the belt then passes through the second scratching machine, which is set to exert very light pressure on the belt, thus causing the belt to be lightly brushed or scratched over its entire" 1115 surface and thus placing it in a satisfactory condition to receive glue or cement.

I-Iaving thus described the several steps of my improved process, together with certain forms of mechanism by which the process' may be carried out, I do not wish to be limited to the details herein disclosed otherwise than as set forth in the claims, butwhat I claim is 1. The method gluing or cenienting which consists in causing the fleshy material on the belt to extend loosely therefrom, cutting olf said projecting fleshy material, and thereafter uniformly A rougliening the ilesh side of the belt.

- seo of preparing belts for" 2. The method of preparing belts for gluing or cementing Which consists in scratching the flesh side of the belt to cause the fleshy material on the belt to extend loosely therefrom, skiving off said projecting fleshy material, and thereafter uniformly roughening the skived surface of the belt.

3. The method of preparing belts for gluing or cementing Which consists in scratching the flesh side of the belt to cause the fleshy material on the belt to extend loosely therefrom, skiving olf said projecting fleshy material, and thereafter lightly scratching the skived surface of the belt to uniformly roughen the same.

4. The method of preparing belts for gluing or cementing Which consists in scratching the iesh side of the belt to cause the fleshy material on the belt to extend loosely therefrom, skiving off said projecting fleshy material, skiving the laps of the belt under increased pressure, and thereafter lightly scratching the skit/ed surface of the belt to roughen the same.

5. The method of preparing belts for gluing or cementing which consists in scratching the flesh side of the belt to cause the fleshy material on the belt to extend loosely therefrom, skiving off said projecting fleshy material, manually removing any fleshy material remaining thereon, and thereafter uni- Ifgomly roughening the skived surface of the In testimony Whereof I have hereunto af-l

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