US1305916A - maier and e - Google Patents

Description

K. F. G. MAIER AND E. J. McKNIGHT.

SANDING MACHINE.

AEPLICATION FILED OCT. 31. I918.

Patented J une 3, 1919.

3 SHEETS--SHEET I.

K. F. e MAIER AND E. J. McKNlGHT.

SANDING MACHINE.

APPLICATNON FILED OCT; 31. I918.

June 3, 1919. 3 SHEETSSHEET 2- Patented I! JO:

K. F. G. MAIER AND E. J. McKNlGHT.

SAN DING MACHINE.

APPLICATION FILED OCT, 31. I918.

Patented June 3, 1919.

3 SHEETS-SHEET 3 MASSACHUSETTS, ASSIGNORS TO L. s. McKnIGHr '& son MASSACHUSETTS, n CORPQRATION OF MAINE.

OQMPANY, OF GARDNER,

SANDING-MACHINE.

\ To all it may concern:

Be it known that we, KARL F; G. MAIER.

and ELLIOTT J MCKNIGHT, citizens of the United States, residing at SOuth-Ashburnham and Gardner, respectively, county of Worcester, and State of Massachusetts, have invented an Improvement in'Sanding-Machines, of which the following description,-

in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

The invention to be hereinafter described relates'to sanding machines, and more particularly to that type of sanding machines for treating the :curved surfaces, of wooden strips. a v

In the copendin application of KarlF. G. Maier, Serial 150. 189,009, filed August 30,1917, is shown, described and claimed a sanding-machine having a sanding roll, a curved table. for supporting the curved strips, such, for example, as chair backs,

-- the curvatureof'the strips will vary to suchture; In the present instance of the-inven-i I flexible feeding" members conveniently in the form of sprocket chains connected by transverse bars for feeding the curved strips over the sanding roll, anda presser member orroll opposed to the sanding ro1l-for holding the strips to the sanding roll.

his is an eificient, practical machine for treating the surfaces of wooden strips curved on "the same or approximately the same radius, but it sometimes happens that an extent that when passing simultaneously between the sanding roll andthe presser roll, the latter will press upon a strip of shorter radius to the exclusion of the strip ofanother radius, or at. any. rate, exert an objectionably greater pressure upon the former thaniupon the latter. v

One of the aims and purpose of the present invention, therefore, is to provide means for pressing a. plurality of strips simultaneously against the sanding roll with sufficient'pressure to cause the; roll to properly treat thesurfaces of the strips in case the latter have equal or different radii of curvationfthis .feature is carried into practical effect by the rovision of-na series of arms or members which are individually pressedby springs toward the. sanding roll, the con- Specification of Letters m t.

.Patented June 3, 1919.-

Application filed October 31, m s. Serial K012609124.

struction being "such that the strips are always members which may be adjusted toward or from the sanding roll to'vary the distance of said fingers or members therefrom to conform to strips of different thickness as desired, and to vary the degree of-pressure exerted bythe fingers or members on the strips. Another object is to provide indiyidual springs for the pressure fingers or properly pressed against -.the sand -ing.roll..

Another object of the invention is to pro- 4 vide a support for the pressure fingers or members, and means forvarying the tension of the. springs to compensate for the wear thereon, and to differentially-press the fin ers or members if desired.

other object of the invention is to provide'a station or receiver for the strips located in the path of the feeding means therefor, sothat the strips may be picked up by the feeding means and conveyed from the station or receiver to and between the sanding roll and pressure device.

. Other objects of theinvention are to providemeans to facilitate entrance of the pieces to be treated between-the sanding roll and pressure fingers or members; to provide means for contributing to the support of the j v pieces as they pass from between the sandmg roll and pressure fingers or members;

and toprovideimproved carrier means for feeding the pieces between the pressure finers or members having provision for ads 3usting and tensioning the same as required; With the aforesaid and other objects in.

view, the character of the invention will be' best understood by reference to the following description of onefgood form thereof shown in theaccompanying drawings,

wherein Figure 1 is 'a' perspective view of one part of a machine embodying the invention, in which the sanding roll is' located above-the pressure fingers;

Fig. 2 on anenlarged scale is a'vertical section showing a portion of the sanding roll, a portion of 'the table supporting the pieces, and thepressure' fingers arranged beneath the roll; 4 Q i Fig. 3 is a plan of the pressure fingers and the support therefor;

Fig. 4 is a view of the pressure fingers 'and their support, partly in front elevation and partly in section;

Fig. 5 on an enlarged scale is a detail of one of the tensioning devices for the fingers;

Fig. 6 is a perspective view of a machine in which the sanding roll is located beneath the pressure fingers;

Fig. 7 is a plan of the yieldable table for contributing to the support of the pieces as they pass from between the upper sanding roll and the pressure fingers; and

Fig. 8 is an end view of the table shown in Fig. 7.

Referring to the drawings, the machine shown therein as one of any desired character, and as illustrated in the present instance, comprises side frames 1 and 3 (Fig. 1) connected by cross members 5 secured to said side frames, the

construction being such that the frame will be suitable to support the operating parts.

The sanding roll, in the present instance of the invention, comprises a cylinder 11 having a sanding or grindin surface 13 and secured to a horizontal sha t 15 which may be supported in bearings 17 mounted on the side frames of the machine. This shaft may be provided with any suitable means for driving the same.

The machine is primarily intended to treat the surface of curved strips which are to be fed to the sanding roll. To support the strips, a table 21 may be provided having a curved surface which maybe substantially in conformity with the curved surfaces of the strips to be treated. I In the.

' ing the strips over the table to and past the sanding roll. To accomplish this, in the present instance, an endless carrier 1s provided conveniently in the form of a pair of sprocket .chains 23 connected at intervals by transverse bars or feeding members 25 suitably secured to said chains. To guide these chains in their transit, suitable guide means may be provided, in the present instance, in

the form of guideways 27 having a curvature lture'in substantial accordance with the curvature of thetable. In order thatthe transverse bars may "not ride directly upon or injure the curved surface of the supporting table, the guideways may be raised a short distance above the table, the construction being such that as the chains are -moved to 'feed the strips over the table to the sanding ood form of the invention, comprlses a rame which may be roll, the transverse bars will ride closely adjacent to, but out of contact with the curved surface of the table.

The sprocket chains may be guided in theirthese brackets may be vertically adjusted to give the sprocket chains the tension re- QUlIBdu Suitable means may be provided for driving the sprocket chains. this, in the present instance, a driving shaft 43 is provided journaled in bearings carried by the frame and having a sprocket wheel 45 fast thereon connected by a sprocket chain 47 with a larger sprocket wheel 49on the shaft 31 referred to. The shaft 43 may have a pulley 51 fast thereon connected by a belt 53 with a smaller pulley 55 fast on a shaft'57 journaled in bearings mounted on the side frames of the machine and driven by any suitable ineans as desired. To tighten the belt 53, an idler pulley 53 may engage said belt and be carried at one end of a lever 53 fulcrumed on a pin 53 on one To accomplish of the side frames ofthe machine, the opposite end of said lever being provided with a spring handle 53 adapted to interlock with and be held by a toothed sector 53 in different positions of adjustment.

To contribute to the eflicient treatment of the strips, the sanding roll may not only be rotated, 'but also may be reciprocated aXi-- ally. To accomplish this, the shaft for said roll: may be connectedto a yoke 57 on the upper end of a lever 59 fulcrumed ,interme-. diate its ends on a bracket 61 mounted on one of, the side frames. The lower end of this lever is provided with a follower 63 J which works in a cam groove in a drum 67 mounted on the driving shaft 43 referred to. The construction is such, that ,the cam will rock said lever and reciprocate thesanding roll axially.

The station or receiver for supporting the strips in the path of the endless carrier, in the present instance, comprises a bar 69 mounted on arms 71 fast on a rock shaft 73 journaled in bearings in brackets 75 secured to the side frames of the machine. This receiver bar may be yieldingly pressed toward the work supporting table by'a coil spring 77 encircling a pin and confined between an abutment 81 on one of said brackets and an arm 83 fast on said rock shaft. The construction issuch that strips may be placed on the work supporting table with their lower ends resting against said receiver 'bar where they-"will remain until a .from the table, thereby allowing the lower ends of 'the strips to be picked up by the feed bar. Continued, movement of the carrier will feed the strips upward along the curved surface of the table to the sanding roll.

- sanding roll.

The table and sanding roll are of a width suflicient to. accommodate a plurality of strips, in the present instance, four strips 84 are shown mounted on the work table with their lower ends resting on the receiver bar in readiness to be fed to the In some cases the radius of curvature of all of the strips is the same, but in other cases the radii of curvature of the strips may vary more or less. An important feature of the invention, therefore, relates to means for properly pressing. all of the strips against the sanding roll, whether their radius of curvature is the same, or the radii of curvature are different. This means, in the present instance of the invention, comprises a series of members or fingers '85 (Figs. 2, 3 and 4), each having a curved pressure portion 87 having a smooth surface adapted to bear on the'underfsurfaces of the strips, and each finger or member may have a boss 89 loosely mounted on a shaft 91 secured in brackets 93 projecting up from a carrier bar conveniently in the form of an angle bar 94 havlnq its ends connected to blocks 95 which may be adjustable in uprights 97 mounted in recesses 98in the side frames of the machine.

To adjust these blocks in said uprights,

screws 99 may be threaded to said blocks andjournaled in bearings 101 in said uprights, said screws being suitably confined against axial movement relative to said bearings. At the lower ends of said screws .are

bevel gears 103 meshing with bevel gears 105 fast on the ends of a transverse shaft 107 journaled in bearings in said uprights, said shaft being provided with a suitable hand wheel 111. The construction is suchthat the operator may'turn the hand wheel and through the gears-and screws described, adjust the blocks and carrier bar for the pressure fingers up or down in the uprights as desired. I

Suitable means may be provided for pressing said, fingers or members against the strips passing over the sanding roll. I To accomplish this, in the present instance, each finger or member may have a shank 113 conveniently integral. therewith projecting downward from the supporting shaft therefor. 'Individual coil springs 115 may be provided for the fingers, saidsprings having hook 117 (Fig. '5) which may be anchored to the flange 119 of the finger carrier bar. The convolutions of the opposite ends of the springs may be reduced in diameter and receive the heads of screws 121 entered through holes in the finger shanks,

and having thumb nuts 123 thereon, suitable, washers 125 being confined between said nuts and said finger shanks. The construcon said shanks and rock said fingersup against the strips between said fingers and the sanding roll. The shanks of said fingers may engage the edge of the carrier angle .tion is such that the springs tend to pull bar therefor to limit the up movement of the pressure fingers and prevent the same f om engaging the sanding roll when no s rips are between said fingers and roll. The tension of said springs may be individually varied" by adjusting the thumb nuts on their screws; and thus the pressure of the fingers may be individually varied so as to produce equal or differential pressures of said fingers as desired.

In some cases it may be desirable to simultaneously and equally vary the pressures of ing roll to be efliciently treated thereby regardless of their radii of curvature. I

Entrance of the strips between the sanding roll and fingers may be facilitated by a floating roller 127 (Fig. 1) having trunnions mounted in elongated bearings 129 on the side frames adjacent the sanding roll, the construction being such that the roller may move upward somewhat, but the weigh-t of the roller-will assist proper entrance of the pieces between the sanding roll and fingers.

.S-uitable means may be provided to contribute to the support of thepieces as they emerge from between the sanding roll and fingers. To accomplish this, in the present instance,'a curvedtable 135 (Figs. 1 and 7) may be provided preferably of spring metal having a reverse bend 139 secured to a supporting-bar 141 adapted to be adjustably scribed is adapted to sand or treat the 'con-.

vex surfaces of the curved pieces, but when the concave surfaces of the pieces are to be treated a modified form of the machine may be used in which the series ofv pressure fingers or members will be above the sand ing roll. This modification is shown in Fig. 6, and .comprises atable 146, sanding roll 147, a series of pressure fingers 149 carnaled in bearings in brackets 167 on'the up-- rights, said shaft having a hand wheel 169 fast thereon. The fingers have shanks 171 connected 'by coil springs 172 with the flange 17 3 of the angle 'bar 155. The construction is such that the fingers areyieldingly and independently pressed downward toward the sanding roll to efliciently press the concave faces'of the pieces against said roll. The rest of this machine may be similar to the machine first described, and therefore, it is unnecessary to repeat a showing thereof in Fig. 6. The two machines may be arranged in tandem so that the convex and concave surfaces of the pieces may be progressively fed through the machine.

The operation of the machines; will be readily understood from the foregoing description. The hand lever is operated to rock the idler pulley to tension the belt and cause the travel of the sprocket chains.

Then the operator places the strips to be treated on the work supporting table of the first machine with their lower ends resting against the receiver bar. In the course of the travel of the carrier, a feed bar thereof will reachfthe receiver bar and engage the I lower ends of the strips and feed the same" up over the curved table between the sanding roll and the'presser fingers, the latter serving to properly press the convex surfaces of the strips against the sanding roll so as to be efficiently treated thereby. Then the pieces may be fed between the sanding roll and ressure fingers of the second machine where the concave surfaces thereof are treated.

It'will be understood that the invention is not limited to the specific embodiment shown, but that various deviations may be made therefrom withoutdeparting from the spirit and scope of the appended claims.

What is claimed is 1. In a machine for sanding surfaces of curved strips, the combination of a support having side frames, a curved table for su porting the strips, hearings on said si e frames, a sanding roll for treating the strips strips, the combination of a sandin strips and feed the same over the curved table between said sanding roll and pressure fingers.

2. In a machine for sanding surfaces of curved strips, the combination of a support, a curved table thereon of a width suflicient to support a plurality of strips side-toside relation, a sanding roll for treating thestrips disposed with its axis substantially horizontal, a shaft carried by said support, a series of pressure fingers fulcrumed on said shaft, springs cooperating with said fingers independently to press the side-to-side strips toward said roll, and means to feed the strips over the table between said sanding roll and fingers.

3. In a machine'forsanding surfaces of roll, a

support for the strips, means to eed the strips over said support to said rolls, a plurality of pressure. members opposed to said roll, means to press said members individu-- ally toward said roll, and means to adjust said members bodily relatively to said roll. 4. In a machine for sanding surfaces of strips, the combination of a sanding roll, a support for the strips, a carrier, a plurality of pressure members mounted on said carrier, and means including screws at opposite ends of said carrier for adjustin the pressure members relatively to said rol 5. In a sanding machine for sanding-surfaces of curved strips, the combination of a sanding roll, pressure means opposed to said roll for pressing the strips'toward the latter, a curved table for receiving the stri s, a receiver for temporarily supporting t e strips on said table, and feeding means for taking the strips from said receiver and for feeding the same over said table between said sanding rolland ressure means. a

6. In a sanding machine for sanding surfaces of curved strips, the combination of a sanding roll, a plurality of independent members opposed to said sanding roll for.

pressing the strips thereto, a curved table for supporting the strips, a receiver for engagement with ends of the'strips to support less carrier having means for taking. st 'ps from said receiving station and for feedingpresl the same over saidtable between said sure'means and sanding roll. f

8. In a sanding machine for sanding sur-' facesof curved strips, the combination of a sanding roll, pressure means for pressing strips toward said roll, a curved table for supporting thestrips leading to said sanding roll, an endless carrier for conveying the strips over said table between said pressure means and sanding roll, and guide means for said endless carrier having provision for varying the tension of said carrier.

9. In a sanding machine for sanding surfaces of curved strips, the combination of a frame, a sanding roll mounted thereon, uprights on said frame, a series of pressure members carried by said uprights, spring means for pressing said members toward said sanding roll, a curved table mounted on said frame for supporting the strips, and an end less carrier having feeding members for engaging said strips to feed the same over said curved table between said pressure members to feed the pieces over said support past said roll, and a floating roll to rest on the pieces and facilitate entrance thereof between said roll and members. I

In testimony whereof, we have signed our names to this specification.

K RL F. G. MAIER. V V ELLIOTT J. MQKNIGHT.

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