US2594277A - Work holder for band-sawing - Google Patents

Description

April 29, 1952 c. F. BARTO 2,594,277

WORK HOLDER FOR BAND-SAWING Filed Jan. 16, 1948 2 SHEETSSHEET 1 In ven for- Charles FBarzo,

April 29, 1952 c. F. BAR-TO 2,594,277

WORK HOLDER FOR BAND-SAWING Filed Jan. 16, 1948 2 SHEETS--SHEET 2 22 z 55 N A 5% N v A, 27 Z [nvenzor Charles FBarzo by s neg Patentecl Apr. 29, 1952 WORK HOLDER FOR BAND-SAWING Charles F. Barto, Rochester, N. Y., assignor to United Last Company, Boston, Mass, a corporation of Maine Application January 16, 1948, Serial No. 2,608

The purpose of the present invention is to provide improved means for holding a last and constraining its presentation to a band-saw for the purpose of dividing it in such a way as to form a hinge of the type illustrated in United States Letters Patent No. 1,513,743, granted November 4, 1924, on application of George Clausing.

The novel features of the invention are predicated upon a sequence of operations that differs in one respect from that set forth in the patent above mentioned, namely, a sequence in which the hinge-forming cut is the final cut by which a last is divided into separable parts, forepart and heel part. The reason for making all the other necessary dividing cuts prior to the hingeforming cut is to avoid having to impart reverse rotation to a last to free it from the band-saw after the latter has formed a hinge.

A work-holder for the purpose specified is provided with two upstanding jig-pins on which a last may be impaled, a last of the type under consideration having twoparallel pin-receiving holes extending widthwise, one through the forepart and the other through the heel part. One of the improvements in a work-holder embodying this invention is provided by making the holder in two relatively movable sections each carrying one of the jig-pins, the sections being so connected, otherwise than by a last, that after they have served conjointly to control the hingeforming operation one of the jig-pins may be moved sidewise away from the other as soon as severance of the last is completed, and thus caused to carry the correspondin last-part away from the band-saw to a locality where it may be stripped from its jig-pin without danger to the operator, the last and the band-saw.

The invention also provides means for carrying the work-holder bodily toward and from the band-saw, the carrying means being constrained to a path parallel with the plane of the saw, and therefore capable of retracting the work-holder and both parts of a severed last from the saw without danger of fouling the latter.

Referring to the drawings,

Fig. 1 represents a top plan View of the table of a band-sawing machine equipped with apparatus embodying the present invention, the parts being in their initial positions;

Fig. 2 represents the position to which the work-holder will be moved to place a last in the desired relation to the band-saw for the beginning of the hinge-forming operation, the work- 5 Claims. (01. 143-171) presenting carriage being omitted but the bandsaw being represented in the crotch of the last;

Fig. 3 is a plan view similar to Fig. 1 but representing the work-presenting carriage in its advanced position and the work-holder in the position corresponding to completion of the hingeforming operation;

Fig. 4 represents a sectional view of portions of the saw-table, the work-presenting carriage and the work-holder indicated by line IV-IV in Fig. 2; and

Fig. 5 represents the work-holder as provided with a spring arranged to retract one of the ji pins away from the other.

A last of the type under consideration is turned in one piece including a forepart l0 and a heel part H. After its surfaces have been shaped and finished two holes 16 and I! are bored through it from side to side, and a wedgeshaped piece is cut out of its cone portion leaving a deep recess I2 above the portion that is to be thereafter sawed with a band-saw to form a hinge (Fig. 3) comprising a semi-cylindrical knuckle I3 on one part and a correspondingly shaped recess M in the other. If the present invention is to be utilized a kerf l5 must be out before the hinge is formed, this kerf being below the hinge-forming portion and its deepest part being arranged to be intersected by the terminal part of the hinge-forming cut.

The holes l6 and I! are parallel and located one near the rear of the forepart and the other near the front of the heel part. They are located with regard to the desired location of the hinge, and are spaced one from the other according to the length of a link (not shown) by which the forepart and heel part will finally be connected. While the last is in process of manufacture the holes l6 and I! are utilized to mount it on one pair of jig-pins when cutting the recess [2, on another pair when cutting the kerf l5, and on still another pair when cutting the knuckle l3 and recess M of the hinge.

The jig-pins l8 and I9 of the hinge-forming pair are shown in Figs. 4 and 5 without a last, but in Figs. 1, 2 and 3 they occupy the holes l6 and [1 respectively. These jig-pins are parts of relatively movable interconnected sections 20 and 2| of a work-holder and are parallel with the axis of a pivot-pin 22 that may be afiixed to the section 2|, or to a work-presenting carriage 23, as preferred. In either event, the carriage will constitute a support on which the work-holder may lie and to which it will be connected by the pivot-pin 22 and thereby constrained to angular movement. If the pin 22 is aflixed to the section 2| it will turn in a bearing in the carriage, but if affi-xed to the latter the bearing will be in the section 2|.

The reason for making the work-holder in two sections is to enable the jig-pin E3 to move away from the pin l9 as, soon as the connection afforded by a last is severed. The severance of this connection enables the pin It to carry the corresponding part of the last out of the plane of the band-saw 24. The sections 20 and 2| are otherwise connected preferably by a hinge comprising lapped ear portions and a pivot pin 25, and the jig-pins are located at opposite sides of a line intersectin both pivot pins. When the work-holder is arranged upon its support, as shown, it may be swung about the axis of the pivot pin 22, first to place a last carried by the jig-pins in the desired position (Fig. 2) to begin a hinged-forming operation, and thereafter to feed the last to the band-saw.

The carriage23 is arranged to slide on a track comprising a pair of rails 26 aiiixed to a saw-table 21 and is thereby guided along a path parallel with the plane of the band-saw-M, that plane being indicated in Fig. 1 by a dotted line 28. -A screw 29 carried by the carriage 23 is arranged to abut a stop 36) to arrest the carriage at a station where it will place the pivot 22 in the desired relation to the band-saw (Fig. 3) for the hingeforming operation. The carriage 23 is provided with a throat 3 I, and thework-holder is provided with a throat 32, both arranged to provide clearance for the saw.

The procedure for utilizing the invention is as follows: When thecarriage 23 is retracted from the. saw 24, as in Fig. 1, a last may be impaled on the jig-pins l6 and I1 without danger of fouling the saw. If the knuckle [3 of the hinge is to' be formed on the heel part, rather than on the forepart, the forepart must be placed on the pin I6 and the heel part on the pin ll. When this has been done the carriage 23 may be moved toward the saw until arrested by the stop 30, but during the latter stages of this travel the operator will turn the last counterclockwise about the axis of the pivot. 22 to avoid fouling the saw with the forepart It). The last will thus be located with respect to the saw as represented in Fig. 2, the toothed edge of the saw being toward the forepart.

Now, without moving the carriage 23, the operator will turn the, last about 180 in a clockwise direction about the axis of the pivot 22, thereby feeding the last to the position represented by solid lines in Fig. 3 and causing the saw to form the-knuckle l3 and the recess I4. When the saw intersects the kerf l5 the severance of the last is complete, and the forepart I is free to be shifted to the left (see dash line) of the plane of the saw and to take the section 20 (see dotted line) with it. At this, stage the section 20 will swing counterclockwise about the pivotal center of the pin 25, and since no part of the last or work-holder will lie behind the saw the carriage 23 may be retracted before either part of the last is stripped from its jig-pin.

Fig. illustrates the work-holder as provided with a leaf-spring 33 arranged to retract the section 20 from the position indicated by a broken line to that indicated by a solid line. The ends of the spring are bent to form hooks or eyes and they are interengaged with tabs 34 aflixed to the sections 20 and 2| respectively.

The effect of the spring is to displace the forepart of a last and the section 20 of the work-holder automatically from the plane of the saw at the instant when severance of the last is complete, and to resist any false movement that might otherwise cause the section 20 to foul the saw while the carriage 23 is being retracted.

It will be understood from the appended claims that they are intended to cover all changes and modifications of the example of the invention herein chosen for purposes of the disclosure which do not constitute departures from the spirit and scope of the invention.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States'is:

1. In a sawing machine, a power actuated saw-blade, a support movable toward and from the saw-blade, a work-holder cooperatively related to the saw-blade and comprising two generally coplanar sections, a pivot connecting one of said sections with the support, said sections being disposed in a plane angularly related to that of the saw-blade, a second pivot spaced from the firstand connecting the sections for angular movement together and apart in their plane, and toward or from the plane of the saw-blade, and parallel jig-pins extending one from each section and spaced to impale a work-piece connecting them, said sections thereby being swingable about the first-mentioned pivot in unison with the work-piece until the latter is severed by the saw-blade, the sections then being individually swingable about said second pivot to allow separation of said sections from the saw-blade.

. 2. In a sawing machine, a power actuated sawblade, 9, horizontal support movable toward and from the saw-blade, and work-holding means comprising two flat sections overlaying the support and interconnected by a vertical pivot at their adjacent end portions for relative angular movement, a second vertical pivot by which one of said sections is connected to the support and said means is mounted for movement in a path angularly related to the plane of the saw-blade, and a vertical jig-pin extending from each section, said jig-pins being approximately positioned, whenthe angle between said sections is small, diametrically opposite from each other with respect to said second pivot jointly to im-- pale a work-piece, the sections being rotatable in unison about the second pivot to sever the work-piece by said saw-blade whereupon the individual sections are angularly movable relative to each other about the first-mentioned pivot to separate the severed work-pieces.

3. A machine for forming cylindrical hinge surfaces comprisingv a power actuated saw-blade, a support, means for guiding the support toward and from the saw-blade in apath parallel with the plane thereof, a work holder comprising two sections, a pivot connecting adjacent portions of the sections for relative angular movement in a plane angularly related to the plane of operation of the saw-blade, a protruding portion of one section extending toward the other when in relatively closed angular position but spaced therefrom to permit cutting movement therebetween of the saw-blade, a jig-pin secured in upstanding position in each section jointly to impale a work-piece, said jig-pins being arranged respectively to engage the work-piece on opposite sides of the cut to be sawn, and pivotal means connecting said protruding portion with the support and having a turning. axis normal thereto whereby the sections and work-piece may be swung together about said axis until complete severance of the workpiece whereupon the sections are individually swingable about said pivot.

4. In a sawing machine, a vertical power actuated saw-blade, a horizontal support movable toward and from the saw-blade in a path parallel with the plane thereof, the support having a throat to accommodate the saw-blade, a worksupport comprising two sections having overlapping portions, a vertical pivot connecting the portions for relative angular movement of the sections and movement toward and from the plane of the saw, means for limiting the pivotal closing movement of the sections to assure clearance for the saw-blade, a second vertical pivot spaced from the first and from the plane of the saw and connecting one of the sections with the support, and a vertical jig-pin extending upward from each section, the jig-pins being respectively located at opposite sides of a line intersecting both pivots, said jig-pins being arranged to impale a work-piece for swinging it 6 about the second pivot together with the sections until severed by the saw-blade, the sections then being independently swingable about the first pivot to separate the severed work-pieces.

5. In a sawing machine the combination as set forth in claim 4 further characterized in that a spring is connected to said sections to urge them angularly apart and away from the saw.

CHARLES F. BARTO.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 236,075 Parks et a1 Dec. 28, 1880 1,513,743 Clausing Nov. 4, 1924 2,394,789 Lavoie Feb. 12, 1946 FOREIGN PATENTS Number Country Date 479,527 Germany July 18, 1929

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