US173319A - Improvement in scroll-sawing machines - Google Patents

Description

n. ,MCCHESNM scRoLL-sAWING MACHINE.

No.173,319. A Patented Feb.a,1a7e..

`if,anysals. I Y I larm supports the upper saw-gate.

UNITED STATES PATENT Genion.

REUBEN MOOHESNEY, OIF. NEWARK, NEW JERSEY, A SSIGNOR OF ONE-THIRD HIS'RIGHT TO THOMAS B.,DAVIS, OF NEW YORK, N. Y.

IMPROVEM'ENT'IN SCROLL-SAWING MACHINES.

.Specification forming part of Letters Patent N0. 173,319, datedFebruary 8, 1.876 ;v application filed August 30, 1875.

T o all whom 'it may concern Be it known that I, REUBEN McGHEsNEY, of Newark, in the county of Essex and State of New Jersey, have invented certain Improvements in Scroll-Sawing Machines; Land I do hereby declare that the following is a full, clear, and exact description of the same, reference bein ghad to the accompanying draw A ing, in which- Figure I is a side view of a machine embodying my improvements. Figs. 2, 3, 4, and 5 are detail views, hereinafter referred to.

My invention relates to improvements in scrollsawing machines 5 and it consists in certain details of construction, arrangement, and combination of the various parts, for strengthening and preventing vibration of the trussed arm; for clamping the saw for raising and lowering the saw-gate frame; for guiding or supporting saws of different thicknesses; and for accurately Vadjusting the table-all as hereinafter particularly described.

' The pedestal A and trussed arm B are made in one piece of metal, the arm being of nearly elliptical'i'orm and the upper end of the pedestal terminating near the minor axis of the ellipse. The'ends 'of the arm are a sufficient dista-nce apart to allow for the supporting of the table and the admission of the work between it and the Vupper end of the arm. The lower end ofthe arm B supports the table and the lower saw-gate, and the upper end of the On the outer periphery of the arm B, from the pedestal around to the upper end o t' the arm, at regula-r distances apart, are studs a, having their outer ends provided with notches or depressions, running longitudinally ofthe arm. A tension-brace, C', consisting of a wire cable or iron rod, passes over-the studs a, lying in the notches or recesses, and has one end attached to the pedestal A, and the other end connected with the upper end of. the arm B vby means of a screw turn-buckle, c, attached to the end of the cable, and engaging with -a screw-threaded stud or projection, 11,011 the arm B. By turning this tightening device the brace 'C is strained to the proper degree of tension to strengthen the trussed arm and prevent vibration thereofl when the machine isatwork. Instead of the turn-buckle, a right and left hand nut may be used, and a thread may be formed on the end of t-he brace G i'or engagement with the lefthand nut. The

tightening devices may be applied to both ends ofthe brace, it desired, so as to strain. it in both directions.

Each ot' the sawgates is provided witha saw-clamping device, consisting of two pivoted bent levers or clamping-jaws and a slide for tightening or loosening the saine, Figs. 1, 2,y and 3. Each lever R is bent in a form .resembling two sides ot' a square, and has at one end a hook, r. rIhe two levers-B R are pivoted to the saw-gate I), near the ends on which the hooks r are formed, with said hooks projecting inward toward each other and with the opposite ends of the levers inclined outward and forming two sides o't' a triangle.

In the saw-gate P is a groove for guiding the slide or cross-bar S, which operates the jaws. This slide is formed with a tapering or wedge-shaped projection, s1, which works between the inner edges of the long arms ot' the levers or jaws R, and with` two lugs orl lips, s2, which engage with the outer edges thereof,

so that when the slide S is moved toward the K saw the jaws are wedged open, and when the slideis moved in the opposite direction the jaws are closed by the action of lthe lugs or lips s2 pressing inward aga-inst the outer edges of the jaws. Oneof these clamping devices is attached to the upper gate and another to the lower gate, so that the motion of the upper slide in opening or closing thejaws is the reverse of thatY of the lower slide. The end of the saw is inserted between the hooks r r, so that when the jaws are closed the saw is rmly clamped between the points of the hooks. The slide S is provided with a vertical elongation, hav'- ing a hook, t, at the end, for attaching the cord or band Iby which the saw is driven, and when this cord or band is strained to the proper tension it pulls on the slide S and Vinsures the proper clamping ofthe saw. In order to keep the jaws closed and hold the saw in place when the cord or band is disengaged or not strained taut, I employ a spring, Q, one end of which engages with a fixed point on the saw-gate and the other end engages with the slide S, with a tendency to force it in the proper direction to close the jaws. For im parting motion to the saw I employ two cords or bands, I J. One end of the band l is attached to a wheel, H3, which oscillates on a stud attached to the arm B, and the other end connects with the upper saw-gate by means of the hook t, and the band J is attached to the wheel and connects with the lower saw-gate in the same manner. rI he bands l J pass over-and under two oscillating grooved wheels or pulleys, I J", before reaching the vsaw-gates. I prefer to make each of these wheels of four pieces of wood of qnadrantal form,joined together with the grain of the wood of the different pieces runing in ditferent directions; and in order to prevent splitting' or warping of the wheel thus formed, l cut a supplemental groove at the bottom of the groove proper, and ll it with thread or yarn saturated with glue. The wheel H3 receives motion from a crankwheel, H2, by means of a pitman, h, which I prefer to make of wood, split longitudinally for the greater portion of its length, and having posts or braces inserted in the split portion, by which means I combine strength and lightness. The crank-wheel H2 is carried by the shaft of the main driving-pulley, which shaft has its bearings in an arm, H, extending outward from the pedestal A, by which means a degree of elasticity is imparted to the machine when in motion. The lower wheel or pulley Jx has a xed'bearing. The upper one lx has its bearing in the upper end of a lever, K, pivoted to 'a sliding frame, M, which carries the upper saw-gate, and works in ways in thc upper end of the arm B. The lever K is provided with a spring-catch, l, for holding it in place in a vertical position, and allowing it to be inclined from such position when neces sary. The sliding frame M is provided with a screw, m, the point of which bears on a projecting portion of the trussed arm.

By tightening or loosening the screw, the frame is raised or lowered, and the tension of the bands I and J and of the saw may be regulated to the exact degree required without stopping the machine. j

The sliding saw-gate frame M is provided with a device (see Fig. 4) for holding it up, when desired, consisting of a pin or plunger, Ll, sliding in the frame M, and a spring bolt or catch, L2, working in a seat in the arm B, with the end of the bolt projecting outward from its seat, and rounded so as to allow the pin Ll to readily slip over it.

When it is desired to remove the upper end of the saw from the clamp, in order to insert it through a hole in the work, it is also desirable to have the frame M out of the way while the work is being adjusted. This is readily accomplished by simply raising the frame until the pin L1 has reached the level of the bolt L2, when the end of the bolt will immediately spring out and project beyond its seat, and enter the socket in which the pin L1 works, and thus hold the frame in its raised position. By pushing the pin inward the bolt is forced back, and the frame allowed to descend.

Heretofore, in some machines of a similar character to this, the saw has been provided with a device for guiding and supporting it between the gates, in which the saw worked in a slot or notch nearly corresponding with the thickness of the blade, in consequence of which there was considerable friction of the sides of the blade and of the teeth, and it was necessary to change the guide when a saw of dif ferent thickness was used. To remedy these defects, I employ a guiding and supporting device, (see Fig. 5,) consisting of a pin or bar, V, attached to the lower portion of the frame M, and capable of adjustment therein, to accommodate blades of ditferent widths. In the front or outer end of the pin is a Vshaped notch or recess, o, against which the back of the blade rests, and is thus guided and supported when in motion, and at the same time friction of its sides or teeth is prevented. y Y

In consequence of the shape of the notch it will accommodate saws of different thicknesses, and therefore obviate the necessity for removing i't when the saw is changed.

The table D is attached to the lower end of the arm B by means of a'semicircular plate E, the straight edge ofv whichis provided with lugs e, through which bolts or screws pass into the under side of the table. Between the lugs e and the table are cushions or pads f, of rubber or other elastic substance. The vertical portion of the plate E is connected with another plate by means of a pivot, a slot, and set-screw, and a pin and holes, by which means the table may be oscillated and inclined from a horizontal position.

When `the table is as near a level position as it is possible to attain by the adjustment of the pin gx in one of the holes e", and a still nicer adjustment is desired, the screws or bolts are tightened or loosened, so as to clam p the pads f more or less tightly between the lugs and the table, by which means a perfectly level position may be obtained.

What I claim as new, and desire to secure by Letters Patent, is-

l. The saw-clamp, consisting of the pivoted levers or jaws R It, having the hooks 1' 1', and

the sliding cross-bar S, provided with the proi jection s1 and lugs or lips s2 s2, in combination with the saw-slide, and the cord or band I'or J, substantially as herein described.

2. The sliding pill L1 and spring bolt or catch L2, in combination with the arm B and sliding frame M, substantially as and for the purpose herein described.

3. The elastic pads or cushions j', in combination with the lugs e and table D, substantially as and for the purpose shown and described.

R. MOOHESNEY. Witnesses:

BENJAMiN W. HOFFMAN, FRED HAYNEs.

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