US63574A - stewart - Google Patents

Description

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A. R. STEWART, OF DOUGLAS HARBOR, OANNING, NEW BRUNSWICK.

Leners Parmi No. 63,574, time Aja-z e, 1867.

.IMPROVEMENT IN WOOD-LAIHES FOR TURNING IRREGIILAR FORMS.

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TO ALL WHOM IT MAY CONOERN:

Be it known that I, A. R. STEWART, of Douglas Harbor, Canning, in the county of Queens, and British Province ot' New Brunswick, have invented a new and improved Machine for Turning Irregular Forms; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this specification.

My invention consists principally in so constructing a machine for turning irregular forms that I am enabled to use four cutter-wheels with cutters at the same time, on the saine piece of wood, and in attaching the cutters to two separate frames, as will be hereinafter explained.

Figure 1 is a front elevation.

Figure 2 is a side elevation.

Figure 3 is a plan or top View.

Figure 4 is a side view of the carriages.

Figure 5 is-a view of the swinging frame which holds th Similar letters of reference indicate like parts.

My machinery is attached to a substantialsquare frame, whichV is so constructed that it supports niy shafting, pulleys, and gear-wheels, and other portions in theirproper positions.

A indicates the frame. B is the driving-wheel, which is attached to the driving-shaft B. C and C are drums, from which the cutters are driven. instance I have represented a crank, a, as attached to the driving-shaft. In actual practice there would of course be a pulley where the crank is. D is a shaft, supported on the lower portion of the frame, having upon it a pulley, D, from which the upper drum C is driven. E is another pulley, on` the saineshaft, from which the other drum C is driven. These drums C and O extend across this portion of the frame between the posts, giving ample room for the belts to move back and forth to correspondywith the motion of the cutter carriages. There are four cutter-wheel shafts, each having a pulley and cutter-wheel upon it. Two of them are above and two ale below the spoke or piece of wood to be turned, so that when the cutters a opposite sides of the piece. Each cutter-wheel has two or more cutters. two below stand in line with each other and revolve with the same speed. The upper two are driven from the upper drum, and the lower two from thc lower drum. The pulleys upon these cutter-shafts are indicated by b, and the cutter-wheels by c. V Both are seen in figs. 2 and 4, also in dotted lines in ig.1. The piece to be turned is represented by (Z. The cutter-shafts are attached to two carriages, two shafts to each carriage. The upright portion of these carriages forms two arches, as seen at fff, iig. 2, the supportiug'coluiuns of which are slotted, jj, andthe boxes upon which the cutter-shafts run are confined in these slots, but are allowed to move up and clown according to the shape of the piece to be turned. These carriages are denoted. byjl andf in the drawing, a side view of which is seen in g. 2. Attached to the lower portion of these carriages, and directly under or corresponding with the cutters above, are traversers g, which, of course, move back and forth as the cutters and the carriages move. The pattern d', to which the pin d is to be turned,is placed between these traversers. The upper travcrsers rest upon the top of the pattern d@ and are held ir. contact with the pattern by their own weight and the weight of the cutter-shaft and wheel above. The lower two traversers areheld in contact with the pattern by weights g attached to them, which operate b-y cords running over pulleys m. The carriagesff niove laterally back and forth on ways which are supported by the frame. II-is a screw, attached to the frame .A at t and 7i. rlhis screw has a pulley, I, near one end, by which it is revolved. J and c are loose pulleys, which revolve on this end of the screw-shaft. The screw-shaft -is driven from the short drum K on the shaft ic. n is a-bclt-shiftcr, to throw the belt from the fast pulley I either to the loose pulley J or c. It will be noticed that there are two belts running from the short drum-K, one of which is crossed so that it turns the screw in an opposite direction from the other when it is on the 'ast pulley I. L is a clamp nut, secured to the carriage f. The two parts of the nut are hinged together something like a pair of pincers, so that when the outer ends are brought together, the jaws which form the nut are made to enclose the screw.

e piece to be turned, the pattern, and the gearing,

re revolved they out upon The two cutter-shaftsabove and the When the screw revolves in the nut the carriage moves one way or the other according to Lheway the screw turns. When it is For convenience in demonstrating my invention in the present desired to stop the motion of the carriage the jaws of the nut are unclamped. The clasp or hook l is so arranged thatwhen the motion of the carriage is to be stopped the hook comes in contact with one of the wires b which are fast to the frame. This crowds the hook from' the catch o, and the jaws are then thrown apart by a spring, when the carriage at once stops its motion. The two carriages ff are coupled together by a slotted plate and a screw or bolt. The plate is made fast tof, as seen in the drawing, at one end. The slotted portion laps on tof', to which it is fastened by the screw or bolt. The plate is represented in the drawing by t' and the screw by tf. By this arrangement the two carriages can be connected together when both are to lio used at the same time, and at any distance apart allowed by the length of the slot, and to Suitvdiiferent kinds and lengths of turning, In this machine eithel` One or both of the carriages maybe used on the saine piece of turning. For rapid work, and for turning adapted to both carriages, one set of cutters will be placed so as to commence at the end of the piece and work to the middle, while the other set would commence at the middle and work to the end. The piece to be turned is out in strict conformity to the pattern, as the traversers and the cutters are so connected together that the vertical motion of each is the'same, the inequalities of the irregular-shaped pattern being communicated to the cutters by the traversers, the latter beingl always vin contact with the pattern. The manner in which this contact is maintaincdhas been already described. Fig. 5 represents that portion of the machine which supports the piece to be turned as well as the pattern. This view shows the whole of the frame, the top and outside portionsof which are represented by o in the drawing, The lower portion or bottom piece is seen in dotted lines o. This frame is hung on pivots, the axial centre beingl through the line 1' r, 5.

The pattern d is attached to the end of the sha-ft R at one end, and to a centre crank', r, at the other. The

pattern is revolved by a belt running over a pulley, S, on the shaft R. This pulley is formed in two sections,

which' correspond with the sections of the pulley from which it is driven, S. This is for the purpose of changing l the speed of the shaft R. Attached to this shaft R is a gear-wheel, T, gs. 1 and 5, whielrrotates with the shaft. The motion of this wheel is communicated to the shaft U (which is the centre shaft for supporting the piece to be turned) d through an intermediate gear-wheel, U', to the gear-wheel T on the centre shaft U; These three wheels stand directly Aover each other, and revolve with a uniform speed, the intermediate wheel being used to transmit the motion from T to T. .As before stated, this frame, fig. 5, swings on the centre and crank-shafts of y'the pattern, on the line r r' and on the pivot w in the side of the frame at the right hand. When a piece is turned and to betaken out of the machine the top of the frame is drawn forward out of the line of rota-tion of the cutters w. Fig. 2 is a shaft, upon which the pulley S is fast. Uponthis shaft are two other pulleys, of ,two sections each, one of which drives the small drum K, and the other receives the motion by which the shaft is driven from a cone, V, fig. 3; This cone V is driven from another cone of two sections', X, on the shaft V. his shafthas another pulley, X', which'is fast to the shaft. X is a loose pulley, but both are driving-pulleys. These pulleys receive their motion from the shaft D, from wh-ich the drums C C are driven, as before des(A bed. Z, fig. 3, is a belt-shifter, lying in a horizonal position on the lower part of the'frame. It is attached to er governs the belt which drives the pulley V from the pulleys on the shaft V. This shifter is shoved out by the carriage f in its motion, andl shifts the beltfrom the pulley X to X. This is done by a lever, which extends up from the shifter and comes in contact with the carriage. When that contact ceases the shifter is brought back by a weight attached to the shifter byva cord running over a pulley. This weight is shown at Z. The shifting of this belt alters the speed of the screw as well as that of the pattern and the piece to be turned. The

`burr orrchuck z, which holds the spokeA or piece to be turned, is a hollow chuck placed on to the end of the shaft '11 with a pin coupling at the end, which slips outof gear, when the spoke is removed, and does not revolve with the shaft until another spoke is attached, when it is driven endwise and coupled with the shaft by the crank-centre c at the other end.

I do not claim as new the transmission of motion by pulleys or gears in the manner described, nor do I claim the particular construction or arrangement of the screw or the clamp nut, as I am aware that substantially the same arrangements have been-in use hitherto; but, having thus described my invention, what I do claim as new, and desire to secure by Letters Patent, is

1. The double carriage f and f with their shafts and cutter-wlieels and traversers,arranged and operated substantially as herein shown and described.

2. I claim the screw H, the cla-mp nut L and the swinging frame, ig.5, in combination with the double car-4 riagefandf, operating substantially as herein shown and described and for the purposes set forth.

A. R. STEWART. Witnesses:

W. Onur., Jr., W. H. BARNABY.

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