Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS2772522 A
Publication typeGrant
Publication dateDec 4, 1956
Filing dateMar 18, 1954
Priority dateMar 18, 1954
Publication numberUS 2772522 A, US 2772522A, US-A-2772522, US2772522 A, US2772522A
InventorsMinami Masatsugu
Original AssigneeMinami Masatsugu
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Mechanical sanders
US 2772522 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Dec. 4, 1956 MASATSUGU MlNAMl 2,77


ATTORNEYS United States Patent MECHANICAL SANDERS Masatsugu Minami, Meguro-ku, Tokyo, Japan Application March 18, 1954, Serial No. 417,162

3 Claims. (Cl. 51-141) The present invention relates to mechanical sanders and is more particularly directed to a machine for sanding the surface of sheet material.

The principal object of the present invention is to provide a sander which will produce a finely polished surface upon the material being treated and which presents a fresh surface of a sanding belt to the material without permitting the accumulation of sand dust at the point of sanding.

A further and equally important object of the invention is to provide a mechanically driven sander which will smoothly and evenly sand wide surfaces of sheet material in a continuous manner.

A further object of the invention is to provide a sander which attacks the material being treated from a plurality of directions at the same time and also which supports the material while being sanded.

Further objects of the invention will be in part pointed out and in part obvious from the following description of the accompanying drawings in which;

Fig. 1 is a side elevation of the present device.

Fig. 2 is a top plan view of Fig. 1; and

Fig. 3 is a detail view taken on line a-a of Fig. 1 showing the relative position of the sanding belts, pressing belts and feed rollers only.

Referring now more particularly to the accompanying drawing, wherein like and corresponding parts are designated by similar reference characters, numeral 1 indicates an endless belt having a sanding surface upon the exterior thereof and may be made of rubber or cloth with an emery cloth or sand paper outer surface. Said belt extends around a pair of spaced apart rotatably supported pulleys 2 positioned for driving and guiding said belt in a substantially straight line. A pulley 3 is fixedly connected to one of said pulleys 2 and is driven by a belt B extending around pulley of a driving motor M.

A further pulley 4 is fixedly connected to pulley 3, but is of a smaller diameter. A rotatably supported pulley 5 is connected by means of a belt to pulley 3 and is of a larger diameter than said pulley 4.

A pair of pulleys 6 are rotatably supported and spaced apart and have an endless pressing belt 7 extending therearound in line with and parallel to belt 1. One of said pulleys 6 is fixedly connected to pulley 5 for being driven thereby.

A frame 8 rotatably supports all of said aforementioned pulleys.

A tensioning roller 9 is pivotably connected to frame 8 and bears upwardly against belt 1 due to the counter balancing Weight 10.

Similarly a roller 11 bears upwardly against belt 7 and is spring loaded through the medium of spring 12 tending to pivot said roller upwardly. Beams 13 extend between the standards of frame 8 and pivotably support roller 11 while rotatably supporting pulleys 5 and 6.

A substantially straight and fiat guide 14 is adjustably supported by a beam 13- and is spaced at short distance ice above but parallel to belt 1. Belt 7 slides along the bottom surface of said guide 14 for being guided thereby.

Belt 7 which may be made of steel, rubber or cloth has a series of spaced apart pliable shoes 15 mounted on its outer surface. Said shoes 15 are made of a pliable and resilient material such as soft rubber, sponge rubber or bristles in the manner of a brush.

A further endless belt 1 extends side by side with belt 1 and parallel thereto. This belt 1' has a sanding outer surface and similar driving and supporting elements which are substantially identical with their counterparts for said belt 1. That is, pulleys 2' rotatably mounted upon frame 8 have belt 1' extending therearound and are driven by a smaller pulley 3' fixedly connected to one of said pulleys 2' and rotated by a belt B driven by a motor M.

An endless pressing belt 7 is movably supported by pulleys 6 rotatably supported by said frame with said belt 7' extending between and in line with belt 1. One of said pulleys 6' is fixedly connected to a pulley 5' which is driven by an endless belt connected to a pulley 4 of a smaller diameter which in turn is fixedly connected to pulley 3 for rotation therewith.

Pressing belt 7 has a spaced apart series of shoes 15 similar to shoes 15 mounted on the exterior surface there of and positioned for pressing against belt 15 therebeneath. A straight and elongated guide plate 14 is adjustably mounted on beam 13' and positioned for guiding belt 7 in a straight line above belt 1.

A plurality of rollers 16 are rotatably supported by suitable means, not shown, parallel to, but spaced below guides 14 and 14'. The axis of these rollers extends substantially parallel with the longitudinal direction of belt 1, 1', and 7, 7.

In the operation of the present machine, a piece of sheet material 17, for example a plywood panel, is pushed between rollers 16, 16' in a direction substantially perpendicular to belts 1, 1. Said belts 1, 1' are driven in opposite directions to one another by their respective motors M, M, while belts 7, 7 are driven in the same direction as the sanding belt beneath, but at a slower speed due to the differences in diameter of the pulleys 4 and 5 and 4' and 5'.

Guide 14, 14' guide the belts 7, 7' respectively in a straight line so that the shoes 15, 15 press against belts 1, 1' which are moving at a greater speed than said shoes. Accordingly, belts 1, 1 are caused to move in a straight line across the material 17 but. in opposite directions to one another for evenly and smoothly polishing the surface of said material.

With the progressing feeding of sheet 17, the sanding belt 1 and pressing belt 7 are driven by motor M with the pressing belt located inside of the sanding belt and running at a speed of about 500 feet per minute for example, pressing the sanding belt through the sanding shoes 15. The sanding belt 1 which is pressed by said shoes 15 against the board 17 runs faster than said pressing belt 7 as a rotative speed of about 4000 feet per minute for example, with the result that the belt 1 sands the surface of material 17 with a fresh portion of its sanding surface carrying the resulting sand dust from the sheet material while the sanding surface which has previously contacted said material runs ahead of the sanding position. It is an outstanding feature of the present invention that the lower speed of the pressing belt relative to the speed of the sanding belt causes said sanding belt to contact the sheet material with a fresh portion of its sanding surface thereby eliminating the accumulation of sand dust at the sanding position.

The present device is capable of considerable modification and such changes thereto as come within the scope of the appended claims are deemed to be a part of the present invention.

nzaterial during sanding for movement in one direction and in a substantially straight 'flat position, \an endless driven belt having an exterior sanding surface, 'means movably supporting-and directing said belticrosswise of a face-ofthe sheet material being sanded and ma direction substantially perpendicular to the direction of movement of said material, an endless pressing belt, means 'movably supporting and directing said pressing belt for movement in line With, spaced above, parallel to said sanding belt, means for driving said pressing belt at a speed differing from that of said sanding belt, and a plurality of spaced apart pliable shoes carried by said pressing belt and positioned for rubbing against said sanding belt and pressing the portions of said sanding belt therebeneath against said sheetmaterial.

2. A machine for sanding sheet material comprising means for movably supporting and guiding the sheet material in a given direction and maintaining said material in substantially a straight flat position, a plurality of endless belts each having an exterior sanding surface, means movably supporting and directing said belts laterally of said sheet material With said sanding surface of each belt being in contact with said sheet material on a line substantially perpendicular to the direction of movement of said material, means for driving said belts in opposite directions, a plurality of endless pressing belts, means movably supporting and directing said pressing belts each in line with, spaced above and parallel to one of said sanding belts, means for driving each of said pressing belts at a speed difiering from that of, but in the same direction to its respective sanding belt and a plurality of series of pliable shoes with each series thereof carried by one of said pressing belts and guided thereby against the portion of its respective sanding belt therebeneath pressing said sanding belt against said sheet material.

3. A machine for sanding sheet material as claimed in claim 1 wherein an elongated straight guide is adjustably positioned in line with the portion of said pressing belt above said sheet material for being contacted by and guiding said belt whereby said shoes are caused to press against those portions only of said sanding belt passing thercbeneath and thus said portions of said sanding belt are pressed against said sheet material.

References Cited in the file-of this patent UNITED STATES PATENTS 685,328 Gale Oct. 29, 1901 808,180 Tyden Dec. 26, 1905 891,251 Harbers June 23, 1908 1,043,194 Blevney Nov. 5, 1912

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US685328 *Jan 19, 1901Oct 29, 1901Henry P GaleRubbing and polishing machine.
US808180 *Oct 22, 1904Dec 26, 1905Emil TydenSanding-machine.
US891251 *Nov 2, 1906Jun 23, 1908Frederick HarbersFloor-sandpapering machine.
US1043194 *Nov 27, 1911Nov 5, 1912John C BlevneyGrinding and polishing machine.
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2936551 *Nov 27, 1957May 17, 1960Pittsburgh Plate Glass CoMethod and apparatus for surfacing sheet material
US3650073 *Feb 16, 1970Mar 21, 1972Charles WeismanIceskate blade sharpening machine and method of using said machine for sharpening iceskate blades
US7105350Aug 30, 2002Sep 12, 2006Tropicana Products, Inc.Closure integrity test method for hot-fill bottling operation
US20040043492 *Aug 30, 2002Mar 4, 2004Tammy FosterClosure integrity test method for hot-fill bottling operation
WO2004020966A1 *Aug 25, 2003Mar 11, 2004Tropicana Prod IncClosure integrity test method for hot-fill bottling operation
U.S. Classification451/301, 451/303, 451/309
International ClassificationB24B21/00, B24B21/04
Cooperative ClassificationB24B21/00, B24B21/04
European ClassificationB24B21/00, B24B21/04