US469177A - sperey - Google Patents

Description

2 Sheets-Sheet vI..

J. SPERRY. BAND SAWING MACHINE.

Patented Feb. 1'6, 1892.

(No Model.) l 2 sheets-sheet 2.

J. SPERRY. BAND SAWING MACHINE.

No. 469,177. Patented Feb. 16,1892.

l UNITED STATES PATENT OFFICE.

JOHN SPERRY,'OF NEV YORK, N. Y., ASSIGNOR TO KATE A. SPERRY, OF

SAME PLACE.

BAND SAW-ING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 469,177,0lated February 16, 1892.

Application filed February 25, 1891. Serial No. 382,758. (No model.)

To @ZZ whom it may concern:

' Beit known that I, JOHN SPERRY, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Band Sawing-Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to an improvement in a band sawing-machine, the object being to perfect and make more efficient the construction of the same; and it consists, essentially, in a band sawing-machine havinga crossed saw, whereby double the work of an ordinary band-saw may be performed, two

It also consists in a band sawing-machine having its band-saw crossed, the crossed part-s being deflected into planes which are parallel or at an angle -to each other, said crossed parts -being supported by adjustable roller devices, whereby the space between the two cutting-edges may be made variable.

It also consists in having a cross-saw hung in an adjustable or swinging frame for the purpose of crosscutting; and, further, it comprises many details and peculiarities in the constructionand arrangement of the several parts, substantially as will be hereinafter described and claimed.

In the accompanying drawings, illustrating my invention, Figure l is a'perspective view of my improved band sawing-machine. Fig. 2 is a detail plan view of one of the rollers and a part of the supporting-yoke, which roller has the function of aligning and supporting the saw. Fig. 3 is a detail view of a pair of rollers for supporting the saw at one of its supported points, the lower of said rollers being vertically adjustable. Fig. et is a side elevation of my improved cross-saw carried in a swinging frame arranged for vertically moving in crosscutting.

Fig. 5 is a detail view of one of the guiding devices which I employ in connection with the saw when it is carried in the said swinging frame. Fig. 6 is a sectional view of the metallic cushion.

Similar letters of reference designate corresponding parts throughout all the different figures of the drawings.

Adenotes the main frame of myimproved band sawing-machine, which may of any suitable construction which will permit the mechanical parts of the machine to be conveniently arranged' in connection therewith. Therefore this frame may vary in form and ize, as may be desired.

B denotes a transverse platform, on which the carriage moves which feeds the lumber or other stuff to be cut to the saw. I have not represented in the drawings this carriage, as it is unnecessary,it forming no part of the present invention, which consists in the crossed saw and the adjustments and driving mechanism therefor.

C C designate the wheels or pulleys which carry the saw, said pulleys being in the present instance located in a horizontal position, although of course they may be arranged in any way. They are preferably formed with rounded faces-that is, they are crowned pulleys. These pulleys are supported on the vertical shafts or mandrels a, which are carried in hinged or pivoted frames I and J, respectively, said frames I and J consisting of suitable cross-bars connected together and said frames having a horizontal adjustment.

The frame I is provided with the'screwthreaded rod b, whereon is the thumb-screw c, by the adjustment of which the frame I can be swung upon its hinge or pivot. The frame J is provided with the screw-threaded shaft d, whereon is the thumb-nut c, bythe adjustment of which the frame J can be adjusted horizontally by swinging on its pivot or hinge at the other side thereof. Under the thumbnuts CZ and c are arranged rubber or metallic cushions, which assist in making the adjustment flexible. On the left-hand mandrels a is a horizontal pulley F, and on the right-hand mandrel o, is a pulley G.

In the right-hand end of the frame A is IOC) journaled a horizontal shaft Q, carried in suitable bearings. On this shaft are two loose pulleys E E', and between them is a pulley E, fast on shaft Q.

Power is applied to drive the machine by a belt passing around the fast pulley E.

II denotes a belt which passes around the pulley F, then around one pulley E', then around horizontal pulley G, and then around the other pulley E', and back to pulley F. The shaft `Q is movable endwise in its bearings, the endwise adjustment thereof being effected by means of a suitable lever or any other convenient device. By thus adjusting` the shaft Q endwise the pulley E can be brought into contact with either one or the other of the'pulleys E', as may be desired. lVhen'it is thrown into contact with one of the pulleys E', the belt II will be driven in onedirection, and consequently the saw-pulleys C C will be rotated in the corresponding direction. When the shaft Q is shifted to allow the pulley E to contact with the other pulley E', then the belt Il will be driven in the reverse direction, and consequently the saw-pulley C and the saw will run in the re- Verse direction. IVe have here, therefore, a reversing mechanism of great utility and value, for by a simple shifting of the shaft Q by means of a lever the saw can be driven in j one direction or the other at pleasure.

' low.

D designates a band-saw passing around the crownpulleys C C. This band-saw is crossedat a point about midway between the two pulleys, or, in other, words near its cutting-point. This saw has the crossed portions deflected into planes at an angle, usually a right angle, to the parts which are in contact with the pulleys C C. The crossed portions may be in planes parallel to each other or at an angle-that is to say, they may be so aligned as to be in parallel planes a greater or less distance apart accordingly as they are adjusted-or they may lie in planes not parallel, butrinclined to each other-aa for instance, when a piece is to be cut having an unequal thickness, such as a shingle. The crossed saw is supported at four points between the pulleys-that is, each of the crossed portions has two supports, one on each side of the intersecting points. Any suitable devices may be employed for sustaining and guiding the saw at this point. I have shown in my drawings one form or example of supporting mechanism consisting of a pair of rollers, one above and one below the saw. These devices, are shown in detail in Figs. 2 and 3.

Ldesignates the upper roller, and K thelower roller, between which lies the saw. These rollers lie close against the saw above and be- The upper rollerL is carried by the yoke M and 'rests gently by the pressure of gravity (or of a spring) upon the saw-face. The lower roller K is journaled in a box g, which is carried upon thel screw-shaft k, to which it is secured by means of a bolt g or any other suitable means, said shaft 7o' passing down through one of the beams of the main frame and being provided with jam-nuts Z l.

above and below said beam, so that by the adjustment of these nuts the shaft k may be moved up or down, and thus the position of Vthe roller K adjusted up or down with respect to the under face of the saw against which it bears. The aforesaid bolt g forms a pivot on which the box g rocks sufficiently to allow the roller K to be so adjusted that the saw-plate D may be deflected more or less, as may be necessary in order to get it into exactly the right position to meet the requirements of the work that it has to do. There are obviously four pairs of these guide-rollers supported at the four points already referred to, and the yoke M, which carries the rollerl L belonging to one of the supportslcarries also another roller L at its other end belonging to the other supporting devices acting in connection with the 'same section of the saw. The yoke M is preferably providediwith lugs q near each end, which bear against the boX g, so that said yoke may be kept in place.

It will be observed that the adj ust-ing devices for the saw-mandrel frames I and .I enable meto adjust the tension of the saw, and yet at the same time without disturbing the belt I-I, which maintains its usual position on the pulleys during the adjustment, and performs its usual work without changing its tension. It will also be noted that both sawpulleys are positively driven, andthat one of them is not an idler-pulley and the other a driven pulley, as is the usual casein bandsaws; but they both have a positive movement, and as the result of this both parts of the saw have the same tension and tautness.

In Fig. 4 I have shown a swinging frame with inyimproved cross-band saw arranged therein for the purpose of crosscutting. denotes the swinging framehung on the shaft E4, on which shaft is one of the saw-pulleys E3. the other end of the frame, and the saw D passes around these two pulleys. hindicates an example of log placed beneath the saw to bev crosscut. The saw D is kept suitably aligned and guided by means of suitable de vices, of which there are four, placed at four different points, two for each saw, as shown in Fig. 4f, the devices serving a similar purpose with those shown in the other gures'of the drawings. They are, however, constructed somewhat differently. When the cross-sarir is used for crosscutting, it will generally be found desirable to have the two cross-sections run close to eachother, so that the two cutting-edges will enter the sanne saw-kerf, although, of course, they may be arranged at a short distance apart, so as to make two cuts. The guiding devices `for the saw are shown in detail in Fig. 5. They consist, preferably, of a pair of disks O O, arranged parallel to each other on a shaft o, which is supported inV a The other saw-pulley E2 is supported in I IIS IZO vibrating journal-box O', which is pivoted near its lower end at p to a`part of the frame, and near its upper end is provided with a slot P, which receives a pin p on the frame, and thus permits a certain amount of adjustment of the said journal-box O in order to regulate the alignment of the disks O O. These disks receive the saw D between them, and thus sustain and guide it in the proper position. The pulley E2 is in' this case a driven pulley or idler and is adjusted to regulate the tension of the saw D bymeans of the adj usting-screw m.

Many advantages accrue from the use of my improved band sawing-machine provided with the cross-saw herein described. Since the saw is positively driven by both of its pulleys, it will have more than double the amount of cutting power than when only one pulley is driven. One of the results of the crossing of the saw is that the saw is in contact with more of the periphery of the sawpulleys, since the saw leaves the pulleys at an angle instead of in parallel lines, as it does -when the saw is not crossed, and therefore it receives a' greater motive power from the pulley, as the pulley is in contact with more of of the saw. Here, then, is an increase in the cutting power. It will be noted that the cutting-edge does not meet the Work in a straight line, as does the ordinary band-saw at right angles, so that it enters the saw gradually instead of all at once, and therefore all the well-known advantages derivable from this mode of operating a saw by cutting on an angle instead of straight across are attained by my saw. The ordinary band-saw must have a scraping-shaped tooth in order to prevent it from leading od the wheels or pulleys; but my improved cross-band saw can have the teeth sharpened and pointed so as to cut as easily as a circular saw. Therefore, this being so and the cutting-edges coming in contact with the log in a more favorable manner for cutting, it will be evident that two boards may be cut with the same amount of power as is required to cut one board by the old method. Since the cross-band saw by reason of its bearing upon the face of the drivingwheels and taking the pressure of the cutting directly on the same line with the face instead of as in the old way from taking the cut at the side of the face of the wheels, it will be seen that the feed permits us to cut a forward movement or withdraw the saw from the cutting Without displacing the saw from the pulleys.

The cross-band saw has a great advantage over any other common saw, for the reason that it takes the work directly from the face of the wheels. IVe need no peculiar bearings to keep the saw from running olf the wheels backward; neither will the saw climb or feed off from the wheels forward for the same reason.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is v 1. In a band sawing-machine, a crossed band-saw. I

2. In aA band sawing-machine, a crossed band-saw, in combination with suitable devices for guiding the same.

3. In a band sawing-machine, a crossed band-saw having the crossed portions of its blade deiiected at an angle tothe parts on the pulleys, said crossed portions lying in planes parallel or at an angle to each other.

4. In a band sawing-machine, a crossed band-saw having the crossed portions of its blade deflected into planes at an angle to the parts on the pulleys and parallel or at an angle to each other, in combination with devices for guiding and aligning the saw and adjusting the crossed sections to regulatev the distance between them.

5. In a band sawing-machine, a crossed band-saw, in combination with its pulleys, frames in which the pulley-shafts are journaled, and devices for adjusting said frame, together with guides for the crossed portions of the saw.

6. In combination with the sections of a` vband-saw crossed between its pulleys, fourv guides consisting of rollers in contact with the saw-blade and acting to guide and align the saw.

7. The combination of a crossed band-saw, its guides, and driving-pulleys, thc adjustable frames for the shafts of said pulleys, other pulleys on the said pulley-shafts, a belt passing around said pulleys and also around pulleys on the drive-shaft, and a drive-pulley on the drive-shaft.

8. The combination, with the crossed bandsaw, its pulleys, and their adjustable frames, of the pulleys F and G on the saw-pulley shafts a a, the horizontal drive-shaft Q, having an endwise adjustment, loose pulleys E E and fast pulley E on said shaft, and belt H, passing around pulleys F, E', E', and G, and said shaft Q being adjustable endwise to bring drive-pulley E in frictional contact with one or the other of pulleys E', so as to actuate the saw in 011e direction or the other.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN SPERRY. Witnesses:

WM. L. BOYDEN, HENRY B. BOLTON.

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