US1302949A

US1302949A - meyers

Info

Publication number: US1302949A
Authority: US
Publication date: 1919-05-06
Anticipated expiration: 1936-05-06

Description

J. J. MEYERS.

BAND SAWING MACHINE. APPLICATION FILED OCT- H. I9. 1,302,949. Patented May 6,1919.

5- SHEETS-SHEET l.

1.1. MEYERS.

BAND SAWING MACHINE.

APPLICATION FILED 001.11.1912.

1,302,949. Patented May 6, 1919. I 5 ISHEFTS-SHE'ET 3.

I I l 75 m1. WAsrglNGroM n c J. J. MEYERS.

BAND SAWING MACHINE.

APPLICATION FILED OCT-ll. 1911.

1,302,949. Patented May 6,1919.

5 SHEETS-SHEET 5 UNITED STATES PATENT OFFICE.

JOHN J. MEYERS, 0F CINCINNATI, OHIO, ASSIGNOR T0 J. A. FAY & COMPANY, OF CINCINNATI, OHIO, A CORPORATION OF WEST VIRGINIA.

BAND SAWING-MACHINE.

Application filed October 11, 1917.

1' b all whom it may concern Be it known that I, Jenn J. MEYERS, a citizen of'the United States, residing at Cincinnati, in the county of Hamiltonand State of Ohio, have invented certain new and useful Improvements in Band Sawing-Machines, of which the following is a specification.

It is the object of my invention to provide new and improved means in a band sawing machine, whereby the band-saw blade and the wheels about which the same moves, are combinedly tilted, so that the cutting stretch of the band-saw blade is caused to intersect thesupporting surface for the work being sawed at any desired angle within quitea wide range at both sides of the vertical plane of said intersecting point; further, to provide improved means whereby the band-saw wheels-are combineolly supported upon a supplemental frame which has arc-guide movementon a main frame in a circular path, which has the point of intersection between the cutting stretch of the band-saw blade and the supporting surface for the work being sawed, as its center, and so arranged that said cutting stretch is adj usted at angles to the vertical and to said supporting surface at both sides of the vertical; further, to provide improved means for accomplishingthe adjustments of the supplemental frame; and, further, to provide iu'iproved arrangements of means mounted on and moving with the supplemental frame, forming a. selfcontained structure, for maintaining the driving relation for the band-saw blade from a source of power, throughout the range of adjustments of the cutting path of the band-saw blade to both sides of the vertical. v

The invention will be further readily understood from the following description and claims, and from the drawings, in which latter:

Figure 1 is a front elevation of my improved device. I

Fig. 2 is a rear elevation of the same.

Fig. 3 is aplan view'of the same.

F 4 is a vertical secti0n.'taken in the plane of the line 4-4 of Fig. 7 showing the rack and pinion connection for adjusting the supplemental frame.

Fig. 5 is a vertical section of my improved device, taken on the line 5-5 of Fig. 1.

Specification of Letters Patent.

Patented May 6, 1919.

Serial No. 195,950.

Fig. 6 is a cross-sectional detail of the same, taken on the line 6-6 of Fig. 1.

band-saw wheel at the extreme right position of the present exemplification of my invention, looking toward the rear of the machine. in full lines, and at the extreme left position in dotted lines, to illustrate the self contained character of the driving means and'the freedom of the drive-belt for the lower band-saw wheel from interference in all positions of adjustment of the lower band-saw wheel, and having the lower arc retaining-piece for the outer guide removed for exposing the lower mounting for the supplemental frame.

Fig. 9 is an enlarged front elevation of one of the lower anti-friction mountings for the supplemental frame. 1 t

Fig. 10 is an axial section of the same, taken on the line 10-10 of Fig. 9.

Fig. 11 is an axial section of the mounting for the shaft of the bell-crank lever of the idler roller, taken on the line 11-11 of F 'ig. 3. t

Fig. 12 is a cross-section of the same, taken on the line 12-12 of Fig. 3. i

Fig. 13 is a cross-sectional detail of the mounting for the lower saw-Wheel arbor, taken on the line 13-13 of Fig. 6; and,

*Fig. 14 is a cross-sectional detail of the same, taken in the plane of the line 14.14=

of Fig. 13.

The main frame of the machineis indicated at 21. It comprises an arc casting, provided with an opening 22. at one side thereof, and having a foot-piece 23 at its lower portion adjacent to the opening. A column 24 extends upwardly'and has a laterally extending portion 25 which is rigidly connected with the later'ally bulging portion preferably extending below the horizontal planes of the supporting faces. These supporting faces represent the plane of the floor upon which the machine is set, the surface of the floor being represented by the dotted line 30. The arrangement is preferably such that the lower portion of the main frame and portions of the lower band-saw wheel and the driving means for the latter, are received in an opening in the floor, below the level of the floor, whereby the machine may be made of large size and the supporting surface 82 for the work being sawed may be brought sufficiently low with relation to the floor, so that an operator or theoperators standing on the floor may conveniently manipulatethe work and the machine. It

also provides means whereby the driving means for the lower band-saw wheel and adjusting means for the supplemental frame may be made self-contained with the supple- 37 at its respective ends, and be provided with friction reducing short rollers 38 suitably supported within the same, adjacent to the path of the saw-blade, for aiding in feeding movement of the material at the point where it is subjected to the downward pressure of the cutting teeth of the sawblade. The rollers have axles which are dropped into suitable slot-bearings of the table, so that the rollers are readily removable. The table is provided with a sawslot 39 into which the saw-blade is received, and through the inner end of which the cutting stretch of the band-saw blade moves.

The band-saw blade is exemplified at 41, and is arranged to be received about an upper saw-wheel 42 and a lower saw-wheel 43. The upper saw-wheel is fixed to a saw-arbor 44 journaled in a bearing 45, supported on a block 46 the block being adjustable up and down in a guide 47. Suitable means may be provided for tilting and straining the upper saw-arbor. not more particularly shown because well-known.

for the arcslides.' An arc retaining-piece 581s received over the outer arc tongue 59 of each of the arc-slides and secured to the main frame by bolts 60. An inner are retaining-piece 61 is received over an inner arc tongue 62 of each of said arc-slides, and

is secured to the main frame by means of bolts 63. I

The forward arc-slide has a. bracket 65 secured thereto, as by bolts 66, the bracket supporting the guide 47 for the bearingblock of the upper band-saw wheel. (See Figs. 1, 3 and 5.)

There is preferably a greater angular distance between the ends 67 of the forward arc-slide than between the ends 68 of the rear arc-slide. (Compare Figs. 1 and 2.) The guides for the forward arc-Slide preferably extend throughout the extent of the arc of the main frame, while the rear areguides are preferably of less extent.

The lower band-saw wheel is fixed to a lower saw-arbor 71, which is journaled in bearings 72, adjustable in a bearing yoke 7 3, (see Figs. 6, 13 and 14), which is provided with

extensions

74, 75, respectively secured, as by

bolts

76, 77, to the respective arc-

slides

51, 52. The yoke preferably extends integrally across the arc portion of the main frame, for forming a bearing-saddle. one of said extensions being preferably integral with said saddle and the other of said extensions being fixed to said saddle, as by bolts 78.

The bearings 72 are suitably adjustable in the bearing-saddle, as by providing the saddie with recesses 79, through which the lower saw-arbor is received, and with slots 80, forming guides for end-stubs S1 of the bearings. Plates 82 extend across said slots and are secured to the saddle by bolts 83. Adjusting bolts 84 are adjustable in threaded apertures in the plates, and impinge the bearing-stubs, for adjusting the bearings laterally and vertically, jam-nuts 85 fixing the bolts in adjusted positions. A bolt 86 is threaded through the bearing-saddle and impinges the upper face of each of the endstubs 81 for adjusting the limit of upward movement of the bearing, a jam-nut 87 fixing the bolt in adjusted position.

An upper roller guide 91 for the sawblade is rotatably supported on a rod 92-, adjustable up and down in a bearing-piece 93, of a stand 9 1, fixed to the supplemental frame, as by bolts 95, and movable there with. (See Figs. 1, 2, and 3.) A counterweight 96 is connected with the rod 92 by means of a flexible connection 97 received over a pulley 98, rotatably supported in the upper end of the stand. The stand also supports a band-saw guard 99. V

A lower roller guide 101 is provided for the band-saw blade, and is rotatably supported on a bracket 102, fixed to the forward slide of the supplemental frame, as by bolts 103. The roller guides and the stand and bracket move with the Supplemental frame in the adjustments of the latter.

A saw-blade guard 105 is provided for the rear or upwardly idle traveling stretch of the band-saw blade, and is provided with lugs 106 secured, as by bolts 107, to a bracket 108, fixed, as by bolts 109, to the front arcslide of the supplemental frame.

The means for adjusting the supplemental frame in its arc-guides, are exemplified as comprising an arc-rack 111 on the inner face of the arc-slide 51. A bevel-gear 112 meshes with the rack through an opening 110 in the side of the main frame. (See Figs. 4, 6 and 7). The bevel-gear 112 is on a shaft 113, journaled in bearings 114 of the main frame and a bearing 115 in the column. A worm-wheel 116 is fixed to this shaft. A worm 117 meshes with the worm-wheel, and is fixed on a shaft 118 journaled in bearings 119 in a bracket 120 extending from the column. A spur-gear 121 is fixed to the shaft 118. (See also Figs. 1, 2 and 3). A pinion 122 meshes with the spur-gear and is fixed to a shaft 123 journaled in bearings 124, on a gear-cover 125, fixed to the bracket 120 by bolts 126.

A hand-wheel 127 is on the shaft 123 for rotating the gear 112 manually, for manual adjustment of the supplemental frame arcwise on the main frame, so as to position the cutting path of the saw-blade either in a vertical position, or in a position at an angle to the vertical at both sides of the vertical, throughout a wide range of adjustment. The point in the cutting stretch of the saw-blade which intersects the plane of the supporting surface of the table, instanced at 128, remains the same with relation to said supporting surface throughout said are adjustments, so that the line of feed of the material may always remain the same, with the assurance that the divergence of the cutting path of the sawblade from said line of feed will be adjusted from the point of said line of feed at the supporting surface of the material. 1

The adjustments provided are especially useful in sawing ship timbers, which are large timbers, employed in the construction of vessels or water craft, and provides a quick, accurate and easy means for accomplishing the adjustments with speed, so that great output by the machine is effected.

When adjusting the supplemental frame, therefore, the band-saw wheels, with the band-saw blade thereabout, the roller guides above and below the table for the cutting stretch of the saw-blade, the supports for the roller guides, and the rear saw-guard, as

well as the idler pulleys for controlling the path of the belt about the driving pulley for the lower band-saw wheel, all move together in the adjustment of the supple- Figs. 1, 2, 3, 5, 0, 7 and 8). A power transmitting pulley 132 is fixed to a drive-shaft 133 journaled in bearings 134 extending from the foot of the column 24. Suitable means are provided for drivingthe shaft 133. Such driving means may be either tight and loose pulleys on said shaft or a gear driven by an electric motor, or other wellknown means.

A pulley 135 is on a shaft 136 journaled in bearings 137 of a fork 138, formed on a hanger, pivoted on a stud-shaft 139 fixed in a bearing 140 of the foot-piece 23. The stud'shaft is centrally positioned in one end of the bearing 140, the other end of the bearing having its bore enlarged, as shown at 141, set-bolts 142 adjustable in the bearing impinging the shaft for adjusting its direction in order to properly track the belt received over the pulley 135. (See Figs. 11 and 12).

The bearing-saddle of the yoke 7 3 is pro vided with a bracket 144 having

forks

145, 146, formed thereon, the

forks having bearings

147, 148, thereon, for

shafts

149, 150, having

pulleys

151, 152, thereon. The

pulleys

151, 152 are belt directing pulleys. The

pulleys

151, 152, as well as the bracket and its forks, move with the bearing-yoke 7 3 and the supplemental frame in the adjustment of the latter.

A belt or other flexible driving connection 154 is received about the power transmitting pulley 132, thence about the tightener pulley 135, thence about the directing

idler pulleys

152, 151, thence about the pulley 131 fixed to the lower saw-arbor, and back to the power transmitting pulley, the arrangement being such that the belt is caused to wrap about the pulley 131 on the lower band-saw wheel arbor throughout a substantial part of its circumference and all other parts of the belt are kept away from said pulley, and the stretches of the belt to and from said pulley 131 are kept away from contact with said pulley 131 or the belt thereabout, throughout all adjustments of the supplemental frame, whereby great power is transmitted by means of said pulley 131, and interference of said power transmission is avoided, throughout the wide range of adjustments of the supplemental frame for positioning the path of the saw-blade throughout a wide range to both sides of the vertical plane of said path, the adjustment being exemplifiedas an angular adjustment of ninety degrees, namely, forty-five degrees at each side of the normal vertical position of the cutting stretch of the band-saw blade. 7

The hanger 138 has an arm 155 extending therefrom, on which a Weight 156 is arranged to be adjusted toward and from the pivot of said hanger for regulating the force applied to the tightener pulley 135, for

maintaining the belt in stretched relation about the pulleys and maintaining driving relation with the lower band-saw wheel pulley in all adjusted positions of the supplemental frame.

hen the supplemental frame is adjusted for angular position of the upper portion acter stated, great space is provided at the opening 22 for lateral insertion and removal of the timbers being cut.

The arm 155 is bent so as to place the weight outside the vertical path of the move ments of the pulleys on the supplemental frame, when the supplemental frame is ad'- justed so as to adjust the angle of the cutting stretch of the band-saw blade. (See Fig. 3). An extreme adjustment of these parts toward the right, looking toward the rear of the machine, is exemplified in full lines in Fig. 8, and an extreme adjustment of these parts to the left, is exemplified in dotted lines in this figure.

It will be noted that in all these adjustments the belt makes contact with a substantial part of the circumference of the pulley 131, and that the running parts of the belt are free from contact with each other, so that there is no interference in the running of the belt, and further, that the idler pulleys 151, 152, placed in their relation to the pulley 131, prevent the stretches of the belt passing to and from said pulleys from interfering with the other portions of the belts and other pulleys.

The construction and arrangement of the parts also provides means whereby the driving means for the lower band-saw wheel and the means to be presently described for adjusting the supplemental frame on the main frame, are self-contained with and move as an entity with the supplemental frame in the adjustments of the latter.

Power means are provided for adjusting the supplemental frame, exemplified as comprising a pinion 158, fixed to a shaft 159, the inner end of which is journaled in a bearing 160,,in the column, and the outer end of which is journaled in a bearing 161, at the outer end of a bracket 162 extending from the column. (See Figs. 1, 2, 3, 5 and 7).

Loose pulleys

163, 164 rotate loosely about said shaft, and a tight pulley 165 is fixed to said shaft between said loosely rotating loose pulleys. A drumpulley 166 is fixed to the drive-shaft 133. A straight belt 167 is arranged to be received about said drum-pulley and either the loose pulley 163 or the tight pulley 165. A

twisted belt 168 is received about said drumpulley and either the loose pulley 16 1 or the tight pulley 165. Vhen said tight pulplified at A, or said belts may be laterally shifted automatically by the supplemental frame, for instance, when the supplemental frame has been moved in its arc, either while feeding the material or between feeding movements of material, so as to have placed the cutting stretch of the band-saw blade at a predetermined angle with relation to the supporting surface of the material, either to the right or left of the normal vertical plane of said cutting stretch.

Exempl-ifying this arrangement, I provide a rod 171 fixed in a bearing 172 in the column and a bearing 173 projecting bracketwise from the bracket 162. The rod is non-rotatable, as for instance by being a square rod in square bearings. A hub 17 a is slidable on the rod and is non-rotatable thereon, as by having a bore which fits the square rod, and has belt-shifting fingers 175 projecting therefrom partway about the tight and loose pulleys about the shaft 159, and into the paths of the straight and twisted belts thereabout, for shifting said belts respectively from either loose pulley about the tight pulley, or vice versa, or for placing said belts in idle relation about both loose pulleys.

A lever 176 is pivoted at 177 to a lug 17 8 extending from the column. The lever has articulation with the axially movable hub 17 1, as by means of a bolt 179 threaded into said hub and received through a slot 180 in said lever.

An axially shifta'ble rod 181 is movable in bearings 182 on the table, and at its forward end has a handle 183 thereon for shifting the same. A fork 184: is fixed to said rod, the tines of the fork being received about the end of the lever 176, and being articulated therewith, as by a bolt 185 threaded in said fork and received through a. slot 186 in said lever. By these means the adjustment of the supplemental frame along its arc in either direction may be controlled for adjusting the angle of the cutting stretch of the saw-blade with relation to the plane of the supporting surface of the'material.

Automatic means are provided for effecting cessation of adjusting movement of the supplemental frame, exemplified as accomplished by providing said lever with an arm 187, with which a link 188 is articulated at 189, the link being articulated at 190 to an arm 196 of a bell-crank lever 191. (See Figs. 2, 3, 5, and 7). The bell-crank lever is pivoted by abearing 192 about a shoulderbolt 193 threaded into a plate 197 secured to the frame. The other arm 198 ofthe bellcrank lever is provided With a slot 19-1 received about an arc-rod 195, shown as concentricwith the "arc guides for the supplemental frame and as fixed "to move With said,

supplemental frame. Thus the standard 4-7 for the adjusting block of the arbor of the upper saw-wheel is provided with a bracket 20-1, havin bearingth'r-ough which the arcroc'l extent s. Jam-nuts 202, received about the threaded end of said arc-rod at the respec'tive sides of said bearing, secure said arc-rod to said hearing. The other end of the arc-rod is hired to the bearing-saddle for the lower saw-arbor, as by being received through an aperture in a lug 203 thereon, jam-nuts 20a beingreceived at the respective sides of said lug for fixing the arc-rod in place.

The arc-rod is provided with

adjustable stops

205, 206, respectively above and below the later-ally extending arm of the bell-crank lever, these stops being adjustable on the arc-rod, as by being fixed in adjustable post tions thereon by set-bolts, so that when an arc-movement of the supplemental frame, representing a predetermined angular position of the cutting path of the band-saw blade, has been completed, oneof the adjustable st'ops will strike the said arm of the bell-crank lever for shifting the belt-shifters to shift the belts into'in'o'perative position, that is, shifting both belts upon the loose pulleys.

Permanent stops 209, 210, are also pro vided 'on said arc-rod, being fixed to said arc-rod in suitable manner, so as to prevent adjustment or arc-movement of the supplemental frame beyond a predetermined angle of position of the cutting stretch of the band-saw blade with relation to the supporting surface of the material.

In order to determine the angular position of the cutting stretch of the band-saw blade, the main frame is provided with an arc-gage 211, with the marks of which a finger 212 secured to the supplemental f 'ame is adapted to register. (See Fig. 1);

I provide means "whereby ease of adjustment of the supplemental frame is obtained by relieving the pressure of the weight of the supplemental frame on the main frame, for accomplishing which I provide

rollerbearings

215, 216, between the

respective arcslides

51, 52, and the main frame, the rollerbearings being at the respective sidesof the main name in staggered relation to each other.- (See 8, 9 and 10). The rollerbearings may consist of, an inner cylinder 218, supported on a shoulder-bolt 219 screwed into the. main frame, t-liere being a of rollers 220 about said inner cylinder, and an outer cylinder 221 about said race of rollers, the peripheral edges of the arc-slides bearing on the outer cylinders, so as to relieve the friction due to the weight of the supplemental frame on the main frame, and enabling the supplemental frame with the parts and operating devices thereon to be adjusted arcwise with ease, by the manual control means or the power control means. These roller-bearings are located preferably only about the lower portion of the supplemental frame and are received in recesses 222 in the main frame, and covered by the guides 58.

Having thus fully described my invention, what I claim as new nd desire to secure by Letters Patent, is:

1. In a band sawing machine, the combi nation of a mainframe, a supplemental frame, a material-supporting member, an upper band-saw Wheel and a lower band-saw heel on said supplemental frame arranged for receiving a band-saw blade thereabout having a cutting stretch passing clown- Wardly into said material-supporting member, and separated guiding means between sald main frame and said supple-mental frame, said guiding means comprisin areguides on the outer opposite sides of said main frame, said supplemental frame comprising separated companion arc-slides coacting With said arc-guides, and connecting means extending crosswise of saidmain frame connecting said separated companion arc-slides in a rigid supplemental frame structure. g

2. In a band sawing machine, the combination of a: main frame, a supplemental frame, a material-supporting member, an upper band-saw wheel and a lower bandsaw Wheel. on said supplemental frame arranged for receiving a band-saw blade thereabout having a cutting stretch passing downwardly into said material-supporting member, separated guiding means between said main frame and said supplemental frame, said guiding means comprising separated arc-guides on the outer opposite sides of said main frame, said supplemental frame comprising separated companion. arc-slides coacting with said arcguides, and connecting means extending crosswise of said main frame connecting said separated companion arc-slides in a rigid supplemental frame structure, an arbor for the lower band-saw wheel, and bearing means for said arbor the outer ends of which are separated a greater distance than the distance bet een said areguides, said bearing means having connection with said respective arc-slides.

3. In a' band sawing machine, the combination of a main frame, a supplemental frame, an upper band-saw Wheel and alower band-saw Wheel on said supplementalframe arranged for receiving a band-saw blade thereabout having a cutting stretch passing downwardly, and means for adjusting the angle of said cutting stretch to adjust the upper portion thereof to both sides of the vertical comprising separated arc-guides on the outer opposite sides of said main frame, said supplemental frame comprising sepa rated companion arc-slides distanced from each other and coacting with said arc-guides,

said respective arc-slides having a plurality of separated arc-guiding faces coaeting with said respective arc-guides, said arc-guiding faces located in separated concentric paths at different distances from the axis of said supplemental frame, and connecting means extending crosswise of said main frame con necting said separated companion arc-slides in a rigid supplemental frame structure, a rack on the inner face of one of said arcslides between the separated arcguiding faces thereon, and a pinion in said main frame meshing with said rack.

4. In a band sawing machine, the combination of a main frame, a supplemental frame, a material supporting member, an upper band-saw wheel and a lower band-saw wheel on said supplemental frame arranged for receiving a band-saw blade thereabout having a cutting stretch passing down wardly into said material-supporting member, guiding means between said main frame and said supplemental frame, said guiding means comprising separated arc-guides on the sides of said main frame, said supplemental frame comprising separated companion arc-slides coaoting with said arc-guides, and connecting means extending crosswise of said main frame connecting said companion arc-slides in a rigid supplemental frame structure, an arbor for said lower band-saw wheel, and a pulley on said arbor, said pulley and lower band-saw wheel being at the respective ends of said arbor with said connecting member and said arc-guides and arc-slides located between the same.

5. In a band sawing machine, the combination of a main frame comprising a substantially C-shaped member having separated substantially C-shaped side walls, a supplemental frame, a material-supporting member, an upper band-saw wheel and a lower band-saw wheel on said supplemental frame arranged for receiving a band-saw blade thereabout having a cutting stretch passing downwardly into said material-supporting member, arc-guiding means between said main frame and said supplemental frame comprising separated arc-guides on said separated substantially C-shaped side walls of said main frame, said supplemental frame comprising companion spaced-apart arc-slides coacting with said arc-guides, and a connecting yoke rigid with said arc-slides forming a rigid supplemental frame structure, and an arbor for the lower bandsaw wheel, said yoke comprising bearings for said arbor, the outer ends of which bearings are separated a: reater distance than the distance between said arc-guides.

6. In a band sawing machine, the combination of a main frame, a supplemental frame, a material-supporting member, an upper band-saw wheel and a lower band-saw wheel 011 said supplemental frame arranged for receiving a band-saw blade thereabout having a cutting stretch passing downwardly into said material-supporting member, guiding means between said main frame and said supplemental frame arranged on the arc of a circle having the point of intersection of said cutting stretch and the plane of the material-supporting surface of said 1naterialsupporting member as its center, said guiding means arranged for adjusting said supplemental frame whereby to adjust said cutting stretch to adjust the upper portion thereof throughout angular distances at both sides of the vertical, an arbor for the lower band-saw wheel journaled in said supplemental frame, a pulley thereon, a driving pulley and a directing pulley at the respective sides of said arbor and distanced therefrom, a plurality of idler pulleys about said arbor-pulley between said driving pulley and said directing pulley, said idler pulleys journaled on said supplemental frame and moving therewith, and an endless belt received about said pulleys, said belt forming a loop in which said arbor-pulley is located and a reverse loop extending from said last-named loop in which said plurality of idler pulleys are located and constructed and arranged whereby one of the stretches of said lastnamed loop makes contact with all of said idler pulleys when said upper portion of said cutting stretch is adjusted to one side of the vertical, and whereby said last-named stretch makes contact with only a portion of said plurality of idler pulleys when said upper portion of said cutting stretch is adjusted to the other side of the vertical.

7 In a band sawing machine, the combination of a main frame, a supplemental frame, a material-supporting member, an

upper band-saw wheel and a lower bandsaw wheel on said supplemental frame arranged for receiving a band-saw blade thereabout having a cutting stretch passing downwardly through said material-supporting member, guiding means between said main frame and said supplemental frame arranged on the arc of a circle having the point of intersection of said cutting stretch and the plane of the material-supporting surface of said material-supporting member as its center, said guiding means arranged for adjusting said supplemental frame whereby to adjust said cutting stretch to adjust the upper portion thereof throughout ,angular distances at both sides of the vertical, an arbor for the lower band-saw wheel journaled in said supplemental frame, a pulley thereon, a driving pulley and a directing pulley at the respective sides of said arbor and distanced therefrom, an idler pulley at each side of the vertical plane in which said arbor is located when said arbor is in normal location, said idler pulleys journaled on said supplemental frame, the angular relations between said pulleys adjusted by adjustments of said supplemental frame, an endless belt received about said pulleys, and constructed and arranged whereby to form driving connection by said belt between said driving pulley and said pulley on said arbor under freedom of reversely moving portions of said belt from each other throughout the adjustments of said supplemental frame, and means connecting with one of said pulleys for stretching said belt.

8. In a band sawing machine, the combination of a main frame, a supplemental frame, a material-supporting member, an upper band-saw wheel and a lower band-saw wheel on said supplemental frame arranged for receiving a band-saw blade thereabout having a cutting stretch passing downwardly through said. material-supporting member, guiding means between said main frame and said supplemental frame arranged for adjusting said supplemental frame whereby to adjust said cutting stretch to adjust the upper portion thereof through out angular distances at both sides of the vertical, an arbor for said lower band-saw wheel journaled on said supplemental frame at the lower portion of said supplemental frame, a pulley thereon, a driving pulley and a directing pulley at the respective sides of said last-na1ned pulley and distanced therefrom, a right line between the lower points of the belt-supporting surfaces of said pulleys being below and distanced from said first-named pulley, and idler pulleys j ournaled on said supplemental frame above said first-named pulley between the vertical plane in which the axis of rotation of said arbor is located when in normal position and said driving pulley and directing pulley respectively, and whereby a right line between the axes of said idler pulleys when extended intersects said first-named right line at opposite sides of said vertical plane when said upper portion of said cutting stretch is adjusted to opposite sides of said firstnamed vertical, and arranged whereby a belt received about said pulleys encompasses a substantial portion of said first-named pulley throughout the adjustments of said supplemental frame.

9. In a band sawing machine, the combination. cf a: main. comprising a sub stantially C-shaped portion and a column connected with the rear part of said C- shaped portion for forming an upwardly extending recess between said column and the lower rear curved part of said C-shaped portion, said C-shaped portion provided with are guiding means extending downwardly to substantial distance at one side of said recess, a supplemental frame comprising are guiding means coacting with said first-named guiding means, an upper bandsaw wheel and arbor on said supplemental frame, a lower saw-wheel arbor on said supplemental frame extending across said C- shaped portion, a band-saw wheel thereon, said band-saw wheels arranged for receiving a band-saw blade thereabout having a cutting stretch passing downwardly, and means for adjusting said supplemental frame on said main frame for angular position of said cutting stretch to adjust the upper portion thereof to both sides of the vertical, whereby said lower saw-wheel arbor is received in said recess with said clownwardly extending portion of said guiding means extending downwardly past said lower saw-arbor during adjustments to one side of the vertical.

10. In a band sawing machine, the combination of a main frame comprising a sub stantially C-shaped portion, a floor-stand adjacent to the opening of said C-shaped portion, and a column extending upwardly and having connection with the rear curved part of said C-shaped portion forming a space between said column and said C- shaped portion, said floor-stand and column having lower surfaces arranged for support on a floor, said C-shaped portion extending below the plane of said supporting surfaces, a supplemental frame having arcguide movement on said C-shaped portion, an upper saw-wheel arbor and a lower saw-wheel arbor j ournaled on said supplemental frame, said lower saw-wheel arbor extending across said C-shaped portion, and a band-saw wheel on each of said arbors arranged for receiving a band-saw blade thereabout having a downwardlymoving cutting stretch, and arranged for angular adjustments of said cutting stretch to both sides of the vertical, whereby when said cutting stretch is adjusted. to one side of the vertical. said lower saw-wheel arbor is received along the downwardly projecting curved part of said C-shaped portion toward said floor-stand and when said cutting stretch is adjusted to the opposite side of the vertical said lower saw-wheel arbor is received in said space between said column and said C-shaped portion.

11. In a band sawing machine of the charaeter described, the combination of a main frame, a supplemental frame, a materialsupporting member, an upper saw wheel ar bor, a lower saw-wheel arbor, band-saw wheels thereon arranged for receiving a band-saw blade thereabout having a cutting stretch passing downwardly into said material-supporting member, guiding means between said main frame and said supplemental frame arranged on the arc of a circle having the point of intersection of said cutting stretch and the plane of the materialsupporting surface of said material-supporting member as a center, said guiding means comprising inner and outer concentric guiding faces having radii of different lengths, a pulley on said lower saw-arbor, a driving pulley and a directing pulley at the respective sides of and spaced from said lower saw-arbor, a plurality of idler pulleys on said supplemental frame whose axes of rotation are located respectively adjacent to said inner and outer concentric guiding faces, arranged to permit adjustment of said supplemental frame and said saw-arborswith the saw-blade thereabout about said center during maintenance of relation of the axes of rotation of said idler pulleys to said concentric guiding faces, and the right lines between the axes of said idler pulleys at their respective limits of adjustment intersecting each other when extended.

12. In a band sawing machine, the combination of a main frame comprising a substantially C-shaped portion and a column connected with the rear part of said substantially C-shaped portion for forming a recess between said column and the lower curved part of said substantially C-shaped portion, said C-shaped portion provided with separated arc-guides on its opposite sides, a supplemental frame comprising separated companion arc-slides coacting with said arc-guides, and connecting means extending crosswise of said substantially C- shaped portion connecting said separated companion arc-slides in a rigid supplemental frame structure with said arc-slides extending above said connecting means and having a recess therebetween, an upper band saw-wheel and a lower band saw-wheel on said supplemental frame arranged for receiving a band saw-blade thereabout, sawarbors journaled on said supplemental frame for supporting said saw-wheels, a material-supporting member, the guiding faces of said arc-guides and arc-slides arranged on the arc. of a circle having the point of intersection of the cutting stretch of said band saw-blade and the plane of the material-supporting surface of said materialsupporting'member as a center, and means to permit adjustment of said supplemental frame on said substantially C-shaped por tion for angular positions of said cutting stretch to both sides of the vertical, whereby said lower saw-Wheel arbor is received in said first-named recess and said secondnamed recess is located proximate to the connection of said column with said substantially C-shaped portion, and with said upwardly extending portions of said arcslides at the respective sides of said connection.

18. In a band sawing machine of the character described, the combination of a main frame comprising a substantially C-shaped portion and a column, said column having rigid connection with the median part of said portion for forming a recess between them, a supplemental frame comprising separated arc-guides coacting with said portion at the respective sides of the latter, said arcguides having a connecting member between their lower ends to form a recess between their upper ends, an upper saw-wheel arbor and a lower saw-wheel arbor journaled on said supplemental frame, and meansto permit adjustment of said supplemental frame on said portion for locating said lower sawwheel arbor and said connecting member in said first-named recess and said upper ends proximate to and at the respective sides of said rigid connection.

14. In a band sawing machine of the character described, the combination of a main frame, a supplemental frame, a materialsupporting member, an upper band-saw wheel and a lower band-saw wheel on said supplemental frame arranged for receiving a band-saw blade thereabout having a cutting stretch passing downwardly into said material-supporting member, are guiding 100 means between said main frame and said supplemental frame arranged on the arc of a circle having the point of intersection of said cutting stretch and the plane of the material-supporting surface of said mate 105 rial-supporting member as a center, said guiding means arranged for adjusting said supplemental frame for adjusting said cutting stretch throughout angular distances at both sides of the vertical, power means con- 1 0 necting with said supplemental frame for effecting said adjustments, shifting means for said power means, an arc-rod substantially con entric with said are guiding means, adjustable stops adjustable along 115 said arc-rod, and bell-crank means arranged for actuation of said stops for shifting said shifting means.

In testimony whereof, I have hereunto signed my name in the presence of two sub- 120 scribing witnesses.

JOHN J. MEYERS.

Witnesses:

MAURICE STEINBERG, THERESA M. SILBER.

Qopieao! vthiapatenc maybe. obtained. for five cents each, byaddi'essingtheficommissioner oi l'atentl,

Washington, D, 0." i