US38471A

US38471A - Improvement in scroll-saw mills

Info

Publication number: US38471A
Authority: US
Publication date: 1863-05-12
Anticipated expiration: 1880-05-12

Description

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0A. 2. ILY. (USBORN E'S PRDCESSY UNITED STATES PATENT OFFICE.

IMPROVEMENT IN SCROLL-SAW MILLS.

Specification forming part of Letters Patent No. 38,47 l dated May l2, 1863.

To all whom it may concern:

Be it known that I, W. H. DOANE, of Cincinnati, in the county of Hamilton and State of Ohio, have invented a new and Improved Scroll-Saw Mill; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, making a partof this specication, in which- Figure lis a front elevation of my improved machine. Fig. 2 is a side elevation of the sawbed and a vertical diametrical section through the adjustable guide-tube, showing the arrangement of the saw-guide within the same. Fig. 3 is aloottom view of the bell-mouthed pressure-foot and the tube which holds the guide for the saw.

Similar letters of reference indicate corresponding parts in the three figures.

This invention relates to certain new and useful improvements in hanging and operating that class of straight saws which are intended especially for sawing scroll-work, and which must be hung in rm and substantial guides, which will prevent the saw-blades from being broken or buckling out of shape in their rapid reciprocating motion,

The nature of my invention consists in giving an alternate reciprocating motion to the saw-blade when it is hung in a particular manner by means of an eccentric, which receives its motion from any suitable prime motor, and which works within a yoke which is connected directly to the lower saw-guide, thus dispensing with the usual pitman-driver and its attendant objections, and giving a more steady and positive motion to the saw-blade than hitherto, as will be hereinafter described.

It also consist-s in guiding the saw and keeping it stift' by means of a rod having a longitudinal groove cut into it of Va suitable depth to receive the saw-back, said rod being secured and rigidly retained within an adjustable tube or holder, as will be hereinafter described.

It also consists in a novel device for holding the guide-tube over the work and allowing said tube to be adjusted and set in any de-` sired position, as will be hereinafter described.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

In the accompanying drawings, A represents the standard, and A the table upon which the stuff to be sawed is placed. B is a horizontal driving-shaft which passes through the standard A and carries on one end a loose belt-pulley and a fixed belt-pulley, a', as shown in Fig. 2 of the drawings. On the opposite end of the shaft B an eccentric disk, O, is keyed fast, which has an annular groove in its periphery, and encompassing the grooved eccentric C is a yoke, O', which is madeof two portions bolted together at their ends by the screw-bolts b b. (Shown in Fig. l of the drawings.) The motion of the yoke C is in a vertical plane, which-is at right angles to the horizontal plane of the shaft B, and this yoke is kept in its place within the annular groove in the eccentric O and allowed to receive a vertical reciprocating motion which is communicated to it by the eccentric. The yoke C carries the square guide-rod D, which is perpendicular to and in a vertical plane with the axis of the driving-shaft B. c c are two guide-blocks for the rod D, which blocks, are secured to the standard A, one above and the other below the yoke O. By this arrangement a reciprocating motion can be communicated to the guide-rod D by rotating the driving-shaft B, and it will be seen that the eccentric C, being keyed to a shaft which is in a plane perpendicular with the guide-rod D, will give a positive motion to the guide-rod, and thus there will be no vibrating nor wabbling motion of this guiderod in its boxes c c.v The lower end of this saw-blade d is suitably connected to the head of the guide-rod D under the table A', and this saw projects up through a slot which is made through the table A', and is connected at its upper end to the solid piston e when it is desired to use this piston; but when the piston is not used the upper end of the saw is not affixed to anything. The saw-blade d is guided and stiffened above the table A by means of a steel rod, E, which has a deep groove cut into it in a direction with its length to receive the back of the saw-blade and to allow the saw to work freely, and at the same time to be held in such a manner that it will not receive any twisting action. The guide-rod E is secured concentrically within an adjustable holder, F, or it may be arranged out of the center ,of this holder if necessary, as will be hereinafter described. The holder consists of a hollow tube, F, having an acorn-shaped cap, f, screwed into its upper end for holding the upper end of the guide-rod E, and a circular plate, j", screwed into its lower end for receiving and holding the lower end of this guide E, as shown in Fig. 2 ofthe drawings. Ihe lower plate, f', of

tube F has an oblong slot cut through it for allowing the saw-blade d to pass through it, and when the piston e is used two holes, p p, are made through this plate f', one on each side of the saw-slot for the escape of a blast of air, as shown in Fig. 3 of the drawings. The tube F carries on its lower end a flaring or bell-mouthed portion7 H, with two openings in its sides, and with a smooth, flat bottom. This flaring portion H is intended for holding the stuff down on the table on each side of the saw during the operation of the saw, its wide base being given to it for this purpose. The spaces in each side of this holder H admit ofthe escape of sawdust and also allows the sawyer to examine his work. The tube F is supported from a fixed pendant, I, which is secured to some fixed object above the machine by means of a laterally-adjustable plate or bracket, J, and a split collar, J', which latter is secured to the bracket J by a wrist-pin, k, which can be set up so as to fix the collar J rigidly to the bracket J or loosened for adjusting this collar, as occasion may require. The split collar J embraces the tube F, and it can be made to hold this tube fast by means of the pinching screw j, which is tapped through the ears on each end ofthe collar, and when this screw j is tightly set up the ends of the collar are drawn together and the collar is made to embrace the tube rmly. By loosening the screw j the collar will expand, and the tube F may be adjusted either up or down and again iiXed atany desired elevation from the table A. The object of this latter adjustment is to adapt the bell-mouthed holder H to stuft' of varying thickness. The screw-pin 7c, which connects the collar J to the angular plate J, when loosened allows the tube to be adjusted to suit any rake which it is desired to give the saw, and when this screw 7c is set up tightly the joint is fixed rigidly to the plate J. The inode of adjusting the plate J is by cutting two oblong slots, l l, through it parallel with each other and then securing the plate to the side of the xed pendant I by means of screws m m, passing through the slots l l. NVhen the screws m m are loosened, the plate J, and the tube F, which it carries, can be adjusted laterally and fixed at any desired point by setting up these screws again.

I have represented in the sectional view, Fig. 2, a solid piston attached to the upper end of the saw by means of pins, one above and the other below the piston, which pass through the saw and secure the piston to it.

This piston may or may not be used, at the pleasure of the operator; but when it is used a perforation is made through the cap f for the free passage of air into and out of the tube F, as the pistou reciprocates in this tube. Two perforationsfp p, are also made in the plate j", one on each side ot' the saw d, for the purpose of conducting blasts of air down on the work in the descending strokes of the saw, and thus blowing away the sawdust from the stuft' which is being sawed. However, as I said before, this blast attachment may be dispensed with, aud the pistou e removed from the tube F, as this piston is not at all necessary to the perfect controlling and guiding of the upper end of the saw in its reciprocating movement.

To operate the machine, a belt which com municates with some prime motor is passed over the iixed pulley a. on shaft B, andthe rotation of this shaft transmits a vertical reciprocating motion to the guide-rod D through the medium of the grooved eccentric C and its yoke C. The saw d, being attached to the upper end of this guide-rod D, receives its motion therefrom, and this saw is guided in its motion by means of the slotted steel rod E, which, being fixed rigidly within the tube F, keeps the saw in its place, and serves the twofold purpose of a back as well as a side guide for the saw. Then, again, the tube F, being made adjustable in almost any direction, the operator can give any desired adjustment to the saw and tube either to adapt the flaring foot of the tube to the thickness of the stuff placed on the table, or to set the saw at any desired angle to compensate for the rake in the saw, giving (during all these adjustments) the back of the saw a rm support in its steel guide-rod, at whatever angle the tube F is set.

I do not desire to lay any claim to the piston e, nor to its combination with any of the parts which I have above described, as I desire that this piston arrangement shall form the subject of a separate application, which I shall hereafter make.

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

l. The metal guide-rod E, in combination with the lower support, j" and the upper support, f, or the equivalents thereof, substantially in the manner described.

2. Supporting and guiding the upper end of the saw d in the metal rod E, the latter being fixed within an adjustable tube, F, substantially as described.

3. The combination, with the adjustable tube F, of the flaring bell-mouthed holder II, as herein described.

- 4. The elastic clamping-collar J, in combination with the adjustable tube F and metal guide-rod E, as and for the purposes described.

5. The combination of the tube F, elastic collar J adjustable slotted plate J, and pivot connection 7c, substantially as and in the manmotion to the guide-rod and dispensing with ner described. the pitman-driver, substantially as herein de- 6. Making the upright yoke rod the drivingscribed. rod for the saw, and guiding this rod in its motions by means of two or more guide-boxes arranged above and below the yoke C', the Witnesses: Whole being combined with the eccentric C and saw d, for giving a positive rectilinear WM. H. DOANE.

W. L. ALDRIGH, J A0013 B. WYMAN.