US449696A - Miter-cutting machine - Google Patents

Description

W. J. PERKINS.

MITBR GUTTING MACHINE.

(No Model.)

No. 449,696. Patented Apr. 7, 1891.

NITED STATES PATENT FFICE.

MlTER-CUTTING MACHINE.

SPECIFICATION forming part of Letters Patent No. 449,696, dated April *7, 1891.

Application filed September 10, 1889. Serial No. 323,519. (No model.)

.T0 aZZ whom it may concern:

Be it known that I, WILLIs J. PERKINS, residing at Grand Rapids, in the county of Kent and State of Michigan, have invented certain new and useful Improvements in Miter-Cutting Machines, of which the following is al specification, reference being had therein to the accompanying drawings.

This invention relates to mitering-machines or similar cutters in which a cutting-knife is employed.

The object of my invention is to produce a machine in which a peculiar draw cut shall be imparted to the knife; also, to improve the Operating-handle and place the knife- Operating mechanism where it will not be clogged by the shavings and dbris from the knives; also, to improve the knife-support and provide the knives with a solid hacking, and also to improve the fence,work-rest, and other parts of the machine.

Figure 1 is a front perspective view of the machine. Fig. 2 is a rear elevation. Fig. 3 isa broken top plan of one end of the machine. Fig. 4 shows a detail of the knife- Operating lever and handle. Fig. 5 is a rear elevation of part of the machine with a modified knife-operating lever.

A represents the table of the machine, which forms a basis of support for the other parts. The rear face of the table A has a curved track or guideway B, preferably cast integral with the table, the same being in the form of an arc or arch, the arch springing from a plane some distance below the table and rising nearly to the plane of the table.

Standards C C, one at each rear corner of the table, are firmly secured to said table, and these standards are united at the top by a curved bar D, which bar may be integral with the standards. Bar D has a curved track E at its under side, said track being on a circle concentric with the track B and substantially over the same. A handle F is attached to the top bar D for convenience in carrying the machine.

A knife-carrier G has its top and bottom faces curved to correspond with the curve'd tracks or ways B and E, and of the reverse Shape at the top and bottom of said tracks, so as to slide between said tracks, which tracks serve as a guide for the movement of the knife-carrier. The edges of this knifecarrier are inclined from the perpendicular, say, to an angle of about forty-five degrees. The track B is a little below the level of the top of table A, and in rear thereof, so that the knife-carrierGcan move in a curved path or way formed by the tracks just in rear of said table, rising as it reaches the center of the arch and falling toward each end, but always keeping its edge in a plane parallel with the edge of the table.

Knives H H are securely bolted to the carrier G, the bevel of the knives being on the rear thereof. The edges of the knives are thus brought close to the rear edge of the table A, and in the movement of the knife-carrier will make a shear cut past said edge, one knife facing one 'way and the other in the opposite direction. A stop m near each end of the track prevents the knife-carrier moving too far and out of the tracks. The knives H are supported at their unsharpened edges by a triangular piece I, which is screwed to the face of the knife-carrier G. This gives a very firm support to the cutting-knives. As the knives are groundaway they can be set forward on carrier Gr by means of bolts K passing ,through slots L in the carrier, and by moving piece I downward a solid bearing for the knives will still be maintained.

At each end of the machine there is a pivoted fence M. These fences are supported on pivots O at the top, and said pivots being journaled in lugs P, projecting from the top rail D. The lower ends of the fences are offset and have pivots Q below the top of the table and directly under the pivots O. The rear corner of each fence M is directly beneath the center of pivot O. and above the center of pivot Q, and as' thel fence may be swung on these pivots (see dotted lines, Fig. 1). the rear corner will remain in alignment with the rear edge of the table A and the cutting-edge of the knife. The fences may be swung on their pivots and secured at any angle within the limit of their movement by clamp-screws R, which pass through holes in the fences and slide into slots Sin usual manner. The slots S in the table are preferably curves struck from the pivotal center of the fences. A gage-rest T may be attached to the clamps R of each fence' The gage-rest IOO is prcferably a curved slotted bar, and the clamp-screw passes through the slot. The gage-rcsts can be pushed back out of the way or may be turned, as in Fig. 3, to give a support to a piece on the table A in a position beyond that to which the fence can be swung.

A piece of work to be mitered can be held on the table and close against one of the fences, the end to be trimmed projecting Of course it will be understood that the op-` positebevels may be tri m med at opposite ends of the machine.

To give the peculiar swing to the knives,I have arranged a special lever system, as follows: At the rear of the knife-carrier I place a strong stud U, which passes through a hole V' in lever V. This lever V has a toothed segment V2 at its upper end and a slot XV near its lower end. The slot \V embraces the side of the fulcrum X, (which may be an anti-friction roll) iirmly supported on the base of the table A below the lower track B and projecting a little in rear of said track. A handle a has a boss b at one side and a forked end c. The fork c may be slipped over stud U, where it projects at the rear of lever V. The boss b will then enter between two of the teeth of the segment V2. The handle a may thus be adj usted at any angle with relation to the lever V, and is easily removable by li'ftinv. Then the handle a is swung to one side, it swings lever V on fulcrum X, and lever V moves the knife-carrier by means of the stud U. As the fulcrum X is not at the center of the ares form ed by the curved tracks, the lever V will shift lengthwise on the fulcrum X, giving a lost motion or slip on the fulcrum; but one side or the other of the slot VV will have a bearing 011 said fulcrum.

Instead of a single fulcrum X, two fulcrums X' X' may be provided, and the lever V may be forked, as in Fig. 5. Then one of the slotted forks may be in engagement with its fulcrum while the other fork rocks out of engagement.

A great advantage of this machine is found in the peculiar drawing cut produced by moving the knives in the arc of a circle while standing at an angle with relation to the work.

I do not desire to limit myself in all respects to the details of construction shown, as equivalents may bezsubstituted.

\Vl1at I claim isl. In combination with the floor or table of a slicing-machine, an arched knife-guiding way above and below the knife and in proximity to the straight edge of the table, and a knife traveling in said. Way,with its cdgcs moving in a plane parallel With the Lto straight edge of the table, substantially as described.

2. The mit-er machine table having an arched track adjacent to its rear edge and integral with the table, a second arched track concentric with the first and connected to the table by standards, and a knife-carrier arranged between the tracks to run on the arched way, in combination, substantially as described.

3. The miter-table having guideways adjacent to its rear edge and above and below the knife, the knife-carrier moving in said guide- Ways, and a knife on said carrier having .its edge inclined with reference to the table, so as to move past the same with a shear cut, in combination, substantially as described.

4. The miter-machine having concentric curved tracks, the double-inclined knife-carrier moving in the way formed by said tracks, the knives, one at each side of said carrier, and the block interposed between said knives, whereby the knives brace each other, all in combination, substantially as described.

5. In a niitering-machine, the combination of a table, a knife moving in a curved way so as to shear against a straight side of the table, a fence pivoted to swing on the face of the table and retain its corner in line with the edge of the knife, and a clamp for holding the free end of the fence.

6. The combination of the table, the fence pivoted thereto, the clamp for holding the swinging end of the fence to the table, and a separately-movable gage held by said clamp and serving as an auxiliary to the fence.

7. The combination, with the table having a fulcrum below theknife-carricr and a knifecarrier moving adjacent to said table, of a lever engaging said fulcrum and carrier, said lever provided with teeth or projections, and a detachable handle engaging said teeth and also engaging the body of the lever, substantially as described.

8. The combination, with the table, knifeway, and knife-carrier therein, of a fulcrum below said knife-carrier, a lever engaging said fulcrum and the knife-carrier and having a variable leverage and lost motion between the two, and a handle for Operating said lever, as set forth.

9. In a mitering-machine, the table having a knifeway, the knife-carrier moving in said way, the lever engaging said knifeway and a fulcrum so as to permit a lost motion, as described, and an operating-handle adj ust-ably secured to said lever, the specified elements being combined substantially as described.

10. The combination of the table having a Curved track adjacent to its rear edge and a fulcrum below said track, a second curved track conoentric with the first above the table, the knife-carrier moving between said tracks, a slotted lever provided With segmental teeth, having its slot around said fulcrum and engaging a projection from said carrier, and a dctachable handle engaging IOO IIO

the teeth of said segment and having likeable handle connected to said leve1',sulost-an- Io Wise an end connection to the lever, all sub tially as described. stantially as stated. In testimony wher'eof Iaffix my signature in 11. In combination with the table and knifepresence of two Witnesses. oarrier moving in ways adj aoent thereto, an

Operating-level' extending alongside theknife- WILLIS J. PERKINS. oarrier and having a projection engaging the Witnesses: same, a f ulorum below the engaging surfaoes EDWARD TAGGART,

of the lever and knife-oarrier, and an adj ust- W. A. BARTLETT.

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