US11568A - photo-iitho - Google Patents

Description

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unirsi) saires PATENT orrioii.

DUSTIN F. MELLEN, or wENtrwoRaH, NEW HAMPsriIRn y `iviiiniian FOR sau/ING cnAPBoARDs, au.

`Specification of Letters Patent No. 11,568; dated August 22, 1854.

T 0 all 'whom t may concern: l Be it known that I, D. F. MELLEN, of Wentworth, in the county of Grafton and State of New Hampshire, have invented certain `new and useful Improvements in` Machines for Sawing Clapboards, of `which the following is a full, clear, and exact description, reference being had to the accompanying drawings, Vmaking part of this specification. I

`In `machines f for sawing clapboards `as heretofore constructed a single stationary saw has been'employed, the log being moved longitudinally above it and lowered as the successive layers `of clapboards were taken 'Ihe obj ect ofremy y improvements is to accelerate the operation and increase theproduct of machines of thiskind, and my invention consists firstly in the arrangement of two saws in swinging frames which are allowed to vibrate' tol and from each other to accommodate the distance between them to the varying diameters of the logs from l-which the clapboards are to be cut.

l should remain invariable as otherwise the thickness of the" clapboards will` vary. If the feeding pawl be caused to strike against a `stationary dog the feed may be `greater at one time than at another should the momentum of the carriage vary. If the mo- `tion` of the feeding pawl be limited by a fixed stop unless the motion of the carriage cease at the eXact instant when the pawl is brought down upon its stop, great strain if not the rupture of some of the` parts, will be the consequence.` To remove this difliculty is the object of my third improvement which consists in causing `the feeding pawl` f to strike against a rigid stop' andin combithe carriage, in the fol-lowing manner.

`refractory lumber or `where there is a 'deflciency oflpower, `which latter often occurs in seasons when the streams are low, to operate thesawssingly, eachimakingits' cut as the carriage takes out or in; to accomplish this is the object of my fourth improvement, which consists ina peculiar method `of raising and lowering the saws so as to bring them alternately into operation, as will be hereafter fully explained.

To` enable others skilled in the art to make and use my inventionI will proceed to describethe mannerin which I have carriedit out.

In the accompanying drawings Figure 1 is a perspective view of a machine' with my` improvements attached. 'Fig` 2 is a plan of the same;` Fig. 3 a longitudinal section upon the line A A of Fig. 2. Figs. t, 5, 6, 7, 8, 9, l0 and l1 are details which will be referred to hereafter.

The general features of the machine `will first be described and then the improvements which I have added thereto.`

C is the frame work of the machine,\D` the carriage in which the log is dogged, from which the clap-boards are to be cut. Thiscarriage runs upon ways E and is driven back and forth with an equable m0- tio'n in the following manner.

F is a rack bar which is hinged to the rear of the `carriage at a and engages with the cog wheel Z) upon 'the transverse shaft 0,' this shaft also carries another cog wheel Gr which engages with the gear d upon the shaft fr This latter shaft is driven alterna-tely in one direction and the other for the` purpose of bringing in and carrying out H is a set of cone pulleys loose upon the shaft f which are driven in one direction by a band from a corresponding set of pulleys `K upon the main driving shaft M. is another set of pulleys` also loose upon they `shaft f and which are driven in a contrary direction by a'crossed band from the pulleys L also on the main shaft. The pulleys Hand I are alternately made to drive the shaft" f in one direction and the other by the clutch 0 which runs with a spline upon the shaft and which is operated by the c'arriage as follows. l

P is the shipper rod` which carries adjustable dogs g, g; these dogs are alternately `struck by the shipper `upon the carriage,

as the latter arrives at the opposite ends of its traverse, and thus the rod P is slid in one direction and the other, by which motion is given to the vertical lever Q, which is jointed to the rod P and pvoted at z'. This lever is connected by the rod R to the bent lever S, S, Fig. 9 pivoted at Z4, by which means the bar T and Vclutch O are moved, the arm U upon the former guiding the latter in the customary manner.

By moving the clutch O the 'shaft f is causedy to revolve alternately in one direction and the other, and the carriage is takenY out and in-the springs in advance of the dogs g g receive the blow from the approaching carriage and prevent it from injuring bv its momentum the parts connected with the shipper rod.

The saws are arranged in the following manner V, V, are the frames which vibrate around the main shaft M and carry the saw shafts rlV W at their outer extremities, these shafts are driven byI bands A A, from the pulleys B, B upon the main driving shaft. The position of the saws X X with respect to each other and with respect to the log is determined in the following manner.

Z is a small shaft running transversely across the upper frame V and carrying two pulleys m, and a ratchet wheel n. This shaft is turned by a key upon one of its ends which is made square for the purpose, or in any other suitable manner, and is retained in position by a pawl O.

p are chainswhich pass around and are secured to the pulleys m, their other ends being attached to the lower saw framek V. This distance between the saw frames is adjusted by winding up or letting go the chains p. The two frames are raised and lowered together to accommodate their position to that of the log in the following manner. 'g are chains one end of each of which is attached to the upper frame V at 1'; these chains pass over the guide rollers s, down through the frame work at t, and are attached at their other ends to pulleys u upon a shaft a which runs in bent levers b pivoted at the point e upon opposite sides of the frame work. The bent lever Z9 is connected at the point cZ with the rod f for a purpose to be hereafter explained. The shaft a is furnished with a ratchet wheel and pawl similar to those upon the shaft Z for the purpose of raising and lowering the saw frames.

Where it is desired to operate but one of the saws at a time one cutting as the log advances, and the other as it returns the following device is made use of to bring them alternately into operation. j

Zz. is a bolt or catch Figs. 2, 3, 7 and 8 which is hinged to the frame ofthe machine and enters one or other of two notches c" in the adjustable dogs Zc"which are secured to the rod f.

e is a spring which bears the catch ZL outward and forces it to enter the notches z" at certain intervals.

Z is a rod lying immediately over the rod f, and furnished with a wedge formed piece m', the object of which is to press back the catch lZt out of the notches in the dogs Zc, and thus permit the rod f to be moved longitudinally.

n, 0', are adjustable dogs upon the rods f, Z', these dogs are operated upon by the Shipper p attached to the carriage.Y The dogs n are set in advance of those upon the shaft lf, and 'as the carriage advances the shipper p moves the rod Z longitudinally until the piece m co-mes in contact with the catch Zz. and presses it out of thenotches z". The shipper p then strikes the dog O which slides the rod f .into a position which enables the catch Zi to enter the other notch i the piece m having in the meantime passed by to allow the catch to spring linto thernotch. The parts remain in this position until on the return of the carriage the shipper p is made to operate upon'the other set of dogs n o Fig. by which means the rod f is returned to its former position and held lthere by the catch Z1. which enters the other notch z" Figs. 2 and 8 as before. The rod f being connected as before described with the bent'lever the latter receives an intermittent vibratory motion around its fulcrum C', and the saw frames through the connections already described are thus raised and lowered causing the saws alte-rnately to operate upon the log. This portion of the apparatus is only to be made use of where unusually refractory lumber or a deficiency of power renders it necessary to employ but one of the saws at a time.

After each -successive cut the log is fed in the following manner. Z" is a spur center, upon which the log is centered, and which carries at its other end the cog wheel u which engages with the cog wheel '21",' this wheel again engages with the pinion fw made fast to the bevel wheel ae, which gears with the bevel wheel y; upon the shaft a of this wheel is secured the ratchet wheel 2,' loose upon this same `shaft vibrates the pawl lever Z2 of the formrepresentedin Figs. 4, 5, and 6, this lever carries a pawl c which engages with the teeth of the ratchetwheel e; d is a set screw which limits the motion of the lever b the latter being borne away from the set screw by the spring 6; these parts are all attached to the carriage.

Motion is given vto the lever b in the following manner: f is a rod which slides freely in the sockets g, and has attached to it the adjustable dog Zz, against whichA bears the spring i which tends constantly tokeep the dog in contact with one of the sockets g, and to hold the rod f in the t position seen in Figs. 1 and 2.

. stop d.

As the carriage advances the pawl lever b strikes against the rod f and is forced down upon the stop d communicating through its pawl `0 and the4 intermediate gearing a determinate and unvarying feed to the log. Should the momentum of the carriage drive it still farther after the feed has been effected, or should the parts which arrest its motion not be in proper adjustment the spring i will yield allowing` the lever b to press back the rod f and thus no breakage ofthe parts will occur. `tere the lever permitted to strike against a stationary rigid stop and the motion of the carriage continued after the lever was down upon this stop, the breakage of the parts would inevitably result.

Operation: The log being centered in the carriage as seen in Figs. 2 and 3. `The saws 4are adjusted to the proper distance apart by turning the shaft Z and winding up or letting out the chain 7). Theyposition of the two saws with regard to the log is then ad justed, by means of the chain g and the shaft a', the saws being raised or lowered` until they are at an equal distance above and below the center of the log; the log is then allowed to traverse, being driven in one direction or the other as `before explained, by the wheel upon the shaft` 0,

which engages with therack bar F attached to the carriage, each saw makinga cut upon opposite sides of the lo-g. As soon as Athe log has passed beyond the saws, the lever b (Figs. 2, et, 5, G) strikes against the end of `the rod f and t-he log is revolved thethickness of another cla-pboard, through the connections already explained, the spring 2' yielding should thecarriage continue to advance after the lever Z2 is down upon its The next instant the shipper 7L upon the carriage strikes the dog g or its t accompanying spring Aupon the shipperv rod rod I), by which means the clutch O 'is moved, and the motion of the carriage is reversed. Then the log has again passed from under the operation of the saws, the

lower endn of the lever 2) strikes against the spring rod m, t-he operation of which is similar to that of f and the logis again fed round as before. An entire ring of clapboards having been cut from the log, the saws are made to approach each other an amount [equal to double the width of the clapboard, by Vwinding up the chains p upon the pulleys m, the position of the saws being again adjusted with respect to the log, by means of the chain g and pulley a, and the works proceeds as before. It is evident that there are other methods by which the other and the log, which are, the entire equivalent of the chains and pulleys above referred to.

Then from any of the causes above referred to, such as unusually refractory lumber or a deficiency of power, it may be found necessary t0 allow only one of the saws to operate at the same time the apparatus for alternately raising and lowering them al ready described is brought into use, the upper saw being made to operate, while the log is moving in one direction, and the lower saw while it moves in the opposite direction. `It will be perceived -that after the saws are adjusted to the particular size of the log to be operated upon, all the motions of this machine are automatic, whether the saws be made to operate alternately, or together; in the latter case, two clapboards are cut each time the carriage moves either forward or backward while the peculiar mannerin which the cutters which dress the surface of the log are arranged and operated enable the machine tobe operated at `a speed far exceeding that heretofore attained upon machines of this class.

I do not claim two saws operating simultaneously upon opposite sides of t-he same piece of lumber; but

What I do claim as my invention and desire to secure by Letters Patent is,

l. rThe arrangement of devices substantially as described, by which the distance between the saws is varied toA meet the varying thickness of the logs to be sawed, and the saws, when soadjusted, are elevated and depressed together as required.

2. I claim the method substantially as herein described of feeding the log between each successive cut of the saws, that is to say causing the feeding pawl, or the lever which carries it, to strike against a fixed stop, in Combination with the yielding dog 7L arranged and operating as set forth.

3. I claim the method substantially as herein set forth, of raising and lowering the saws, when it is desired not to use them at the same time, but alternately during the forward and backward motion of the log, the same being effected by the combination of the unlocking, shifting and locking ap paratus m', h', 7c, c, in combination with the lever b and chains g, the whole operating in the manner substantially as herein set forth.

DUSTIN F. MELLEN.

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