US889554A - Sandpapering-machine. - Google Patents

Description

2 SHEETS-SHEET l.

PATENTED JUNE 2, 1908.

SANDPAPERING IVIICHIEE.-

APPLIOATIOH Hum AUG. 29, 1907.

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s Till@ PATENTED JUNE 2, 1908.

J. P. SIMMONS. SANDPAPERING MACHINE.

APPLICATION FILED AUG. 29, 19 07.

2 SHEETS-SHEET 2 ATTORNEY .papermg machines,

' novel sauras earner, ernten.

JOHN P. SIMMONS,` OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO HARRON, RICKARD &

MCCONE, OF SAN FRANCISCO, CALIFORNIA, A

CORPORATION OF CALIFORNIA.

sAnDPaPnnme-Macnrnn.

no. esatte.

To all whom it may concern:

Be it knownA that I, JOHN P. SIMMONS, a citizen of the United States, city' and county of San Francisco and State of California, have invented certain new and useful Improvements in Sandpapering-Machines, oi which the following is a specification.

My invention relates to the class of sandand particularly to A.an improvement in the drums thereof which carry the sand-paper, said improvement having for its object the provision of a simple and eHective means for automatically continuously' taking up the slack of the sandpaper and keeping it under continuous proper tension around the drum Whlle the machine is in motion.

It is im ortant that the sand-paper on the drum sha1v be kept tightr and smooth. If there is any slack, such,,for example, as is caused by the expansion-due to dampness, it.

will puckerfand Wrinkle 'and then tear; or, if held rigidly tight, it will also tear under contraction-due to dryness.

My y invention contemplates a gripping pressure under constant yielding tension, which will'compensate for all expansion and contractionof the paper, and hold it properly tight at all times and under all conditions, on the drum.

To this end my invention consists in the automatic .dripping and tensioning device, which I sha now fully describe by reference to the accompanying drawings in which Figure l is a plan of the sand-paper drum of the machine, showing the gripper rolls turned to a position to initially recrve the sand-paper between them. Fig. 2 is a longitudinal section of the drum. Fig. 3 is a cross section of thedrum, the oripper rolls being turned to aposition for c amping the sand-paper and holdingit under tension. Fig. 4 is an elevation of one end of the drum.- Fig. 5 is an elevation of the other end of the .'lhe drum of the sand-papering machine comprises a'c'entral shaft 1, u on which are secured the s iders 2 in an suitable number, and an encirc ing shell 3 oiysteel or other ma- Specication of Lettera Patent. Application ed August 29,1%7. Serial N o. 390,586.

residing in the tions,

Patented June 2, 1908.

terial, said shell heingnpenat/the top, as shown at 4.A f

Mounted rotatably per-rolls 5, which are ex osed through tie top openingl of the shel and extend the whole len th of the drum. At one end the gripper-ro ls are provided withjintermeshing gears 16,. (Fig. 5), to cause them t rotate in unison,1 and, at the other end', one ofsaid vrolls is squared, as seen at 7 in Fig. 1, to receive asocket-Wrench, to turn them, At one portion of its circumference, each gripperroll 1s flattened, as seen at 8 in Figs. 3 and 4, whereby when the rolls are turned up, these flat portions form, as shown inF'ig. 1, an entrance slot 8 to initially receive the sandpaper. The l slot formed bysaid `flat -porreferabiy, does not entend` quite to the en( s of the rolls, thereby forming an accurate guide for the entrance of the aper.

The holes in the spiderspokes in W 'ch one of the gri per-rolls is mounted are made slightly ob ong as seen in Figs, 3 and 4, in order to permit said yrolls to separate or .spread when the sand paper is clamped between thexn. A fiat spring 9 on each spider presses against the side of that gripper-roll which is mounted in the oblong holes, and 4normally holds it, relatively'to the other roll, with clamping force on the sand-pa er when the latter is between the rolls; ut when no sand-paper is between them, the pressure of the spring Q is limited by a lug 10 against which the spring bears, thereby maintaining the proper width of the entrance slot 8 to receive the paper.

A .lug 11 is secured -near each end of the.

gri per-rolls, and'to each lug is ivoted a col ar-pin 12, thus forming a togg e connection with the Arolls. The othervend ofthe collar-pin 12 passes freely down through a lug 13 von the spider. Spiral springs 14 are seated on the pins between their collars and the lugs 13, and ,serve to normally continuously impose a pressure on the gripper-rolls tending continuously to turn their tops towards each other.

15 is a pin fixed in the spiders to limitjghe turning o the gripper-rolls to a position to receive the. sand-paper.

in one spoke of each I spider are thegtwo adjacent and parallel gri ioo lli- The operation of drum `is as follows With a 'socket wrench the gripper-rolls are turned until the lugs 11 rest against the pins 15, where they will stay at rest, by reason of the spring connection being thrown past center. This position brings the ilat sides 8 of the rolls to the top and opposite each other to form the entrance slot S', shown in Fig. 1. The sand-paper being now wrapped upon the drum, its two ends are passed through the slot 8. Then the gripper-rolls are turned back, and their round sides now @rip the sand-paper, the springs 9 giving the c amping pressure. The lugs 1l and the collar-pins 12, with the springs 14, being thus thrown to the other side oi the center, said springs now not only hold the rolls in position, but also exert a constant tension on the sand-paper to continuously keep it tight by compensating for its expansion or contraction. By this construction also, the tension is increased by the centrifugal force due to the weight of the springs and their connections when the drum is rapidly revolving, and these parts have no tendency to throw the drum out of balance.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is 1. In combination with the drum of a sand-y papering machine, a pair of gripper-rolls rotatably mounted in the drum and adapted to receive and clam the ends of the paper between them; an means acting on said rolls for imposing constant yielding rotative pressure to compensate for the expansion and contraction of the paper and to keep it under constant tension.

2. In combinationwith thedrum of a sandpapering machine, a pair of gripper-rolls rotatably mounted in the drum and adapted to receive and clamp the ends of the paper between them; and springs connected with said rolls for imposing upon them constant yielding rotative pressure to compensate for the eX ansion and contraction of the paper and to ecp it under constant tension.

3. in combination wi th the drum of a sandpapering machine, a pair of gripper-rolls rotatably mounted in the drum and adapted to receive and clamp the ends of the paper between them, said rolls having projecting lugs collar-pins pivotcd to said lugs; lugs in the drum through which the other ends of the collar-pins play; and springs on the collarpins'disposed to impose on the rolls a constant yielding rotative pressure, to compensate l'or the expansion and contraction oi the paper and to keep it under constant tension.

4. ln combination with the drum of a sand-paperingr machine, a pair of gripperrolls rotatably mounted in the drum and adapted to receive and clamp the ends ol' the paper between them, said ro ls havingr at one portion ol their circumference correspondingly disposed flat sides, to form an entrance slot for the ends of the paper; and springs connected with said rolls for imposing upon them constant yielding rotative pressure, to

compensate for the expansion and contraction of the paper and to keep it under constant tension.

5. In combination with the drum of a sand-papering machine, a pair of gripperrolls rotatably mounted in the drum and adapted to receive and clam the ends of the paper between them, said ro ls having at one ortion of their circumference correspondingly disposed flat sides, to form an entrance slot for the ends of lthe paper; means for effecting the rotation of the rolls in unison, to initially receive and clamp the paper; and springs connected with lsaid rolls for imposing upon them constant yielding rotative pressure, to compensate for the expansion and contraction o the paper and to keep it under constant tension.

6. in combination with'the'drum ol. a sand-papering machine, a pair of gripperrolls rotatably mounted in the drum and adapted to receive the ends of the paper between them, one oi' said rolls being movable in its bearings to and from the other; springs bearing on the movable roll to impose a clamping pressure upon the paper; and means acting on said rolls for imposing constant yielding rotative pressure to com ensate for the expansion and contraction o vthe paper and to keep it under constant tension.

7 In combination with the drum of a sand-papering machine, a pair of gripperrolls rotatably mounted in the drum and adapted to receive the ends of the paper' between them, said rolls having at one portion of their circumference correspondingly disposed l'lat sides, to l'orm an entrance slot for the ends of the paper, and one o1c said rolls being movable in its bearinffs to and from the other; springs bearing on the movable roll to impose a clamping pressure on the paper; 'fixed stops for said springs to limit their pressure on said roll and means acting on said rolls for imposing constant yielding rotative pressure to compensate for the expansion and contraction of t 1e paper and to keep it under constant tension.

8. In combination with the drum of a sand-papering machine, a pair of gri per-rolls rotatably mounted in the drum am adapted to receive and clamp the ends of the paper between them, said rolls having at one portieri of their circumference correspondingly disposed llat sides, to form an entrance slot for the ends of the aper; lugs on the rolls; collar-pins pivoter to said lues; lugs in the drum through which the other ends of the collar-pins play springs on the collar-pins disposed to impose on the rolls a constant yicding rotative pressure to compensate for Sidonie in 'ntact-to' limit :the rotation A.of the Witnesses:

the ex ansion and. commotion of. the. paper In testimonyA whereof I have signed my and to eep'ii; underconstaht tension means 'for4 turning the `rolls in unison-youd xed -pins in the drumogainst which the lgsoft/ho rolls l tw'osubscribing witnesses. f

rolls a'nd hold them in position to receive the name to this-speeicatio the presence of

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