US1978149A - Abrading machine - Google Patents

Description

Och 23, 1934. G. M. STEVENSON 1,978,149

- ABRADING MACHINE Original Filed Jan. 28. 1950 5 Sheets- Sheet 1 N N V i1} 8; I!

v I nvl c" I a Enventor Q03 8 MAI/5200220 attorney Oct. 23, 1534.

ABRADING MACHINE G. STEVENSON Original Filed Jan. 28. 1930 5 Sheets-Sheet 2 3nnentor attorney Ociz. 23, 1934. G. M. STEVENSON ABRADING MACHINE Original Fiiea Jan'. 28, 1930 5 Sheets-Sheet 3 inventor (Ittomeg Oct. 23, 1934.

G. M. STEVENSON ABRADING MACHINE 5 Sheets-Sheet 4 Original Filed Jan. 28, 1930 attorney Oct. 23,1934. G. M.STEVE NSON 5 1,978,149

' ABRADING MACHINE Original Filed Jan. 28 1930 5 Sheets-Sheet 5 29 men or.

- G'eage jfdtvvezmon 8g" I I Patented Oct. .23, 1934 TEs UNITED s12.

ABRADING MACHINE George M. Stevenson, Baltimore, Md.

Application January 28, 1930, Serial No. 424,047 Renewed April 18, 1934 8 Claims.

This invention relates to abrading machines of the type in which the abrading means consists of g a suitably driven endless belt. or band surfaced with abrading material, into'contact with which.

the articles to be treated are adapted to be moved,

and the object of the invention, generally speaking, is to provide, in a machine of this type, a. novel combination and arrangement of parts intended to enable rapid and accurate abrasion, particularly of irregular surfaces, in a thoroughly efficient and satisfactory manner.

While the present machine is capable of use for abrading various articles; it is primarily adapted for finishing the irregular surfaces of 1d mouldingsand similar. strip-like articles, and

in this connection it is a more particular purpose of 'the invention to provide novel means for guiding such articles in their feed movements relative to the abrading belt, and for holding the articles against buckling, chattering and other .undesirable movements during abrasion thereof.

The machine includes a die for imparting to the effective abrading portion of the belt the desired transverse shape adapted to be imparted to the articles, and in this connection it is an important purpose of the invention to provide novel supporting means for the die to enable same to partake of suflicientyielding movement in all directions to compensate for any ordinary irregularities which may exist in the initially unfinished article being treated.

A further purpose of the invention is to provide cushioning means between the die and the 35. belt whereby the engagement of the beltwith thearticle is rendered soft and yielding to compensate for different degrees of hardness and irregularities in the material of the article, thus to assure uniform abrasion of the articlethroughout its length. 1

' ,With the foregoing general purposesin view, the invention consists in the novel features of construction, combination and arrangement of parts as will be hereinafter more fully described, illustrated in the accompanying drawings and defined in the appended claims. Figure 1 is a'perspective view of an abrading machine constructed in accordance with the in- I vention.

Figure 2 is a-detail view illustrating one of the devices for holding the articles against buckling during abrasionthereof.

' Figure .3 is an enlarged side elevation of the -die and die supporting mechanism, showingalso the cushioning means between the abrasion belt. t

Figure 4 is a top plan view of the mechanism illustrated in Figure 3.

Figure 5 is a detail section on line the 55 of Figure 3. i

Figure 6 is a detail section on the line 66 of Figure 3.

Figure 7 is a detail section on theline 7-7 of Figure 3. k

Figure 8 is a transverse section through the machine showing the die and its supporting means in end elevation.

Figure 9 is a central, longitudinal section die and the through the die and its supporting bracket; and

Figure 10 is a central, longitudinal section through the fixed portion of the die supporting mechanism. r

- Referring to thedrawings in detail, A designates, generally the frame of the machine, which includes a horizontal bed portion 10 and, preferably, an integral, vertically extending mechanism carrying portion 11 rising above'the bed 10.

Suitably mounted above the bed 10, in front of the portion 11, is a pair of belt wheels 12, 12, one of which is adapted to be driven in any suitable manner to impart movement to an endless belt or band 13 trained over said wheels, the arrangement being such that the lower reach of the in any suitable manner with an abrasive and, as

indicated in Figs. 1 and 8 of the drawings, the article to be treated, a m'oulding B for example, is adapted to be placed on the bed 10 and moved therealong with its upper face in contact with the under side of the lower reach-of the belt 13, whereby desired finishing of the moulding is effected by the abrasive action of the moving belt .13. Novelmeans is provided whereby strip-like articles B of different sizes may be positionedand guided on the bed 10 in proper-relation to the belt 13. This means consists essentially of a bar 14 extending longitudinally of the machine on top of the bed 10 and against which a side of the article 8 is adapted to bear and to be guided in its movement beneath'said belt. Transverse slots 15 are formed in the bed 10 and in these slots bars 16 are mounted for sliding adjustment, these bars being secured at their inner ends to the guide bar 14 and at their outer ends preferably being connected together by .a brace rodi'l serving to maintain their spacement and to provide a convenient means for eflecting their transverse collective adjustment, thus to adjust the bar 14 transversely of the machine for the purpose of positioning strips B of different widths properly with respect to the abrasion belt.

Any suitable means may be provided to secure the bar '14 in a desired adjusted position, but for simplicity and convenience the fastening screws 18 (Fig. 8) which secure the bars 16 to the bar 14, are utilized in the present instance to accomplish this purpose.

At suitable locations along the machine 10 feed rollers 19 and 20 are provided between which the mouldings or other-articles B are adapted to pass and by which said. mouldings or articles are adapted to be fed beneath the abrasion belt, these, rollers being driven in any desired manner.

To hold the articles B against the guide bar 14, other rollers 21 are provided for engagement with the edge of the article opposite to the edge thereof which is in engagement with said guide bar.

These rollers 21 are mounted on arms 22 pivoted to the base 10 for horizontal swinging movement to enable adjustment of the rollers 21 towards and away from the bar 14 to accommodate articles B of different widths, the pivot -screws 23 of said arms preferably being employed -to secure said arms and the rollers carried thereby in desired adjusted positions.

It is extremely desirable to hold the articles 3' against any sidewise movement, especially in the immediate vicinity of the efiective abrading portion of the belt 13. To this end a frame 24 is mounted on the bed 10 for transverse adjustment, and carried by this frame is a pair of rollers 25, 25 adapted for engagement with the outer edge of the article 13, one to either side of and immediately adjacent to the point of contact of the belt 13 with the article. The frame is adjusted by tuming the screw 24 in one direction or the other after first loosening the bolts 24'. The rollers 25 may be adjusted vertically by loosening the clamping screws 25.

To hold the article B against buckling or chattering in a vertical direction immediately adjacent to the point of contact of the belt with the article, flexible plates 26 are provided to overlie and engage with the upper surface .of the article to either side of the point of contact of the belt 13 therewith, adjustable cam members 27 being provided to cause these plates to bear with desired pressure upon the article. Conveniently, one of these plates 26 may be constituted by an extension of a dust-collection housing 28 disposed over a portion of one of the belt wheels 12, this housing being adapted for connection with a suitable source of suction whereby dust formed by the machine is drawn away substantially as fast as it is produced, the plate 26 serving to guide the dust into the housing.

Referring now to the mechanism for holding the effective abrading portion of the lower reach of the belt 13 in engagement with the article B, and for causing this portion of the belt to assume the desired transverse contour of the article, it will be noted that the vertical portion 11 of the frame A hassecured thereto a U-shaped bracket the effective abrading portion thereof. One end portion of said shaft 31 is mounted forlongitudinal sliding movement in its related bracket arm 30 and the other end portion thereof is threaded and provided with nuts 32 for engagement with opposite sides of the other of said bracket arms, whereby the shaft is adapted for longitudinal adjustment and to be locked in a desired adjusted position.

Splined or otherwise mounted on the shaft 31 for longitudinal, non-rotative adjustment with respect thereto is a bracket 33 carrying a set screw 34 for engagement with said shaft to lock the bracket against movement relative thereto. On this bracket, at each side thereof, is formed a. pair of vertically spaced ears 35, while between said ears said bracket further is formed with a pair of laterally spaced, upwardly extending arms 36.

Referring now particularly to Figs. 3, 4, 5, '7, 8 and 9 of the drawings, it will be noted that there is provided for cooperation with the bracket 33, a die supporting bracket indicated generally at 3'7. This bracket includes a plate 37, which like the bracket 33, is provided at each side with a pair of vertically spaced ears 38. Connecting each ear of this plate with the related ear 35 of the bracket 33 is a link 39, said links collectively constituting a double parallelogram structure serving to hold said plate against lateral movement relative to the bracket 33 but permitting free vertical swinging movement thereof as is manifest.

Mounted between the arms 36 of the bracket 33, on trunnions 40 carried by said arms, is a block 41, and passing loosely through this block and connected at one end with the plate 37, as at 42, is a rod 43, having threaded on its other end, for cooperation with the block 41, an adjusting nut 44 adapted to be secured against rotation by a lock-nut 45. Thus, when the nut 44 is in engagement with the block 41, the rod 43 constitutes a tension member limiting downward swinging movement of the bracket 3'1.

Projecting from the upper end of the plate 3'7 in a direction longitudinally of the machine is a shaft 46 on which is mounted for. transverse swinging movement, a depending bracket arm 3'7 which is transversely slotted as at 47 to receive a tongue 48 on the lower end of the plate 3'7 whereby said bracket arm is held against longitudinal swinging movement relative to said plate and guided in its transverse swinging movement.

Extending from the plate 3'7 in overlying relation to opposite sides of the bracket arm 37*, is a pair of lugs 49, 49 in which are mounted plungers 50, 50 pressed inward by springs 51, 51 against opposite sides of said bracket arm, whereby the latter, although capable of yielding laterally relative to said plate, is constantly urged by said spring pressed plungers to assume a normal position between the lugs 49, 49. Under certain conditions-it may be desirable to secure the bracket arm 3'7 against all movement relative to the plate 3'7 and to this end a screw I 52 threaded into the plate 3'7 is provided for looking engagement with the arm 37*.

The lower end of the'bracket arm 3'7 is bifurcated to provide a pair of depending lugs 53, 53, spaced longitudinally of the machine, and in theselugs are mounted pivot pins 54, 54, respectively, one atleast of which preferably is adjustable. Pivotally mounted by means of these pins, for rocking movement in a plane transverse with respect to the machine, is a die holder 55 in the form of any inverted U-'.

shaped block adapted tov have detachably mounted therein, by means of set screws 58. a belt shaping die 57. To limit or entirely prevent rocking movement of said die holder, set screws 58- are threaded into the arm 37" for cooperation with the topof said holder:

The die 57has its under face shaped to the contour of the upper face of the article 28 and as will be understood by reference to Fig. 1- of the drawings, said die is adapted to press downwardly against the lower reachof the belt 13 to cause the latter to assume the contour-of the upper face of the article 3 whereby all portions thereof'are adapted to be effectively abraded bythe belt, in which connection it will, of course, be understood that a plurality 01 dies 57 having different shaped lower faces are provided foruse in connection with articles B of different shapes.

Any suitable means may be provided for pressing the die 57 downwardlyagainst the belt. this being accomplished in a simple and satisfactory manner in the present instance by mounting suitable weights 59 on the shaft 48.

Referring now particularly to Figs. 1, 3, 4 and 6, it will be observed that the bracket 29 carries a housing 80 in which is contained a roll of sheet felt or similar soft and yielding material 61, afree end portion of which extends across the top of the transverse bottom portion of said bracket to and between thelower face of the die 57 and the upper face of the lower reach of the belt 13.

, An adjustable cam 62 provides means whereby this sheet of material may. be clamped against the bracket 29 so that it-will not be pulled from its housing by the belt 13, and, as is apparent, the portion of. said sheet disposed directly between thedie and the belt serves not only to permit free sliding movement of the belt across the die,

but also to provide a yielding pad between the die and belt permitting the latter readily to accommodate itself to irregularities and different degrees of hardness in different portions of the articles B. Obviously, by releasing the cam clamp 62 new portions of the sheet 61 may be fed between the die and the belt as often as necessary.

In view of the foregoing it is believed that the construction, operation and advantages of the present machine will be fully understood. In 're-. capitulation, however, it may be pointed out that the links 39 serve to permit vertical movements of the die 5'1, the pivotal connection of the bracket arm 37'! with the plate 3'! serves topermit lateral movements of the die, and the pivotal mounting of the die holder serves to permit rocking movements ofthe die, so that all. movements of the die essential for eihcient operation of the machine are provided for in a simple, compact mechanism. Furthermore, by reason of the adjustability of the bracket 33 along the shaft 31, rough lateral adjustments of the die may readily be effected, after which the desired accurate and final lateral adjustment of the die may be effected by means of the nuts 32.

I claim: 1. An abrading machine comprising a bed over which an article to be abraded is adapted'to bemmed, abrading means above the bed for abrading contact with the upper face of the article, a

laterally Adjustable bar against which one side guide means for cooperation with the sides of article, and a pair of laterally positioned rollers bearing againstsaid last mentioned side edge forwardly andbackwardly of the abrading contact and adjacent thereto and means for adjusting said rollers laterally of the bed;

2. An abrading machine comprising a bed over which an article to be abraded is adapted to be I moved,'abrading means above the bed for'abrading contact with the upper face of the article,

the article, and yieldablee, means for direct engagement with the top of the article to hold it against the bed and cam means for adjusting the pressure of said yieldable means.

3. An abrading machine comprising a bed over which an article to be abraded is adapted to be moved, abrading means above the bed for abrading contact with the upper face of the article, guide means for cooperation with a side of the, article, means inclusive of a housing for conduc mg dust from the machine, and a plate for cooperation with the top of the article to hold same against said bed, said plate being constituted by an extension of one of the walls of said housing..

4. In an abrading machine, an abrading belt, a die for cooperation with said belt to impart a desired transverse contour to the effective abrad ing portion thereof, means for supporting an article to be abraded in operative relation to the eflective abrading portion of said belt, and a sheet of soft yielding material free at one end and secured at the other end at a point spaced from die and extending between said die'and said 5. In an abrading machine, an abrading belt, a die for cooperation with said belt to impart a desired transverse contour to the effective abrading portion thereof, a fixed bracket, a shaft journaled therein for longitudinal adjustment in a direction transverse with respect to said belt, a second and a holder for said die carriedby said bracket arm.

6. In 'anabrading machine, a die for imparting a desired contour tovthe effective abrading portion of an abrading belt, a pivotally supported parallelogram structure carrying said die for movement into and from cooperative relation to the belt, and a longitudinally adjustable tension rod pivotally mounted at one end abovethe pivotal support of said structure and connected at the other end to the movable end of said struc- 13o ture to thereby limit the downward movement of 1 the die.

7. In an abrading machine, an abrading belt, a die for cooperation with said belt to impart a desired transverse contour to the eifective abrading portion thereof, a supporting framework having an arm pivotally mounted at itsupper end to swing transversely of the belt and provided at its lower end with pivotal means carrying said die, and a pivoted parallelogram structure supporting said framework for movement in a plane normal to the abrading surface of the belt into and from cooperative relationtherewith.

8. In an abrading machine as set forth in claim '7, and yieldable means for restraining the trans- 45 verse movement of said frame-work.

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