US3118158A

US3118158A - Heel breasting machine

Info

Publication number: US3118158A
Authority: US
Inventors: John A Harrington; Robert J Broersma; Jr David L Runnells; Clarence L Johnson
Original assignee: Wolverine World Wide Inc
Current assignee: Wolverine World Wide Inc
Priority date: 1962-09-25
Filing date: 1962-09-25
Publication date: 1964-01-21
Anticipated expiration: 1981-01-21
Also published as: GB977924A

Description

J 1964 J. A. HARRINGTON ETAL HEEL BREASTING MACHINE 3 Sheets-Sheet 2 Filed Sept. 25, 1962 MGR 4 5 WW5 H H T/2b M m n! F W%%% a 2 u 7 5 M A J 1964 J. A. HARRINGTON ETAL 3,113,158

HEEL BREASTING MACHINE Filed Sept. 25, 1962 3 Sheets-Sheet 3 Qua 2M United States Patent 015 ice 3,118,158 Patented Jan. 21, 1964 3,118,158 HEEL BREATING MACHINE .iohn A. Harrington, Grand Rapids, Robert J. Broersma, Spring Lake, David L. Runnells, J12, Grand Rapids, and Clarence L. Johnson, Grand Haven, Mich, assignors to Wolverine Shoe and Tanning Corporation, Rockford, Mich, a corporation of Michigan Filed Sept. 25, 1962, Ser. No. 226,020 11 Claims. (Cl. 12-47) This invention relates to a heel breasting apparatus, and more particularly to a breasting apparatus and method for breasting heels under high speed production conditions to obtain an improved breasted surface on the heels.

In shoe manufacturing, the wedge-heel type construction is formed by securing the heel between the shoe and the sole. Thus, the sole extends flat across the heel, bends into contact with the front surface of the heel, and then extends fiat to the toe. The sole is bonded by an adhesive to the heel and shoe. Wedge heel inserts must be breasted at an angle to provide optimum adhering conditions between the contoured sole and the heel, a good bond must be formed between the front angular breasted surface of the heel and the sole. Even though this surface is presently formed at an angle, there is often considerable difficulty in effectuating a secure, lasting bond between this angular surface and the overlapping sole due to the large stress tending to cause the sole to pull away. In many instances, a sponge rubber sole, especially, will pull away from the front breasted heel surface. After much testing, it has been found that this tendency to pull away is due to the presence of a glazed surface which occurs during the conventional shearing, breasting operation.

This breasting operation is conventionally conducted on one element at a time, by manually positioning the heel stock at an angle with respect to a shear blade. The blade is reciprocated through the heel at the predetermined angle. As is well-known to those in the field, these blades become dull very rapidly. The dull blades cause heating and resulting glazing of the heel material, especially rubber, during shearing. Moreover, these knife blades require constant maintenance. They often form a production bottleneck due to the item-by-item operation. They also wear out rapidly, thereby requiring frequent replacement. Further, they are dangerous to the operating workman.

It is an object of this invention to provide a completely novel and unique breasting apparatus that enables high speed breasting of a large number of heels at one time. Moreover, the apparatus does not require frequent maintenance for or replacement of cutting elements. It neither requires nor utilizes the conventional shear blades.

It is another object of this invention to provide a novel breasting apparatus not only effecting rapid production, but also substantially reducing danger to workmen.

It is another object of this invention to provide a breasting apparatus that actually eflects a superior breasting operation on the heel surface without any resulting glaze, and in fact, if desired, can eifect a roughened surface of a controlled amount to create optimum bonding conditions between the sole and the heel for any particular material.

It is still another object of this invention to provide a novel method of breasting heels, especially for wedge heel shoes, which imparts superior bonding characteristics to the front breasted surface of the heel, and eliminates undesirable glazing heretofore experienced.

It is another object of this invention to provide a novel ethod and device for pre-setting the heel breaster. The device assures breasting of a plurality of heel doubles into exact halves, regardless of thickness variations in the doubles with different batches.

These and several other objects of this invention will be apparent upon studying the following specification in conjunction with the drawings, in which:

FIG. 1 is a perspective view showing the front and one end of one form of the novel breasting apparatus;

FIG. 2 is an enlarged, fragmentary, perspective View of the opposite end of the breasting apparatus in FIG. 1;

FIG. 3 is a fragmentary, enlarged perspective View of the front of the breasting apparatus of FIGS. 1 and 2;

FIG. 4 is a View of the breasting apparatus taken on plane IV-1V of FIG. 1;

FIG. 5 is a fragmentary, sectional, enlarged view of the band saw blade and its adjacent guide panel of the breasting apparatus;

FIG. 6 is a perspective view of a typical heel-double forming the starting stock of the novel breasting apparatus and method;

FIG. 7 is a fragmentary, elevational view of a typical wedge heel type shoe embodying the breasted heel;

FIG. 8 is a plan view of a modified form of the breasting apparatus;

FIG. 9 is a side elevational view of the fixture gauge element of the novel breaster-jig pre-setting device, with a plurality of heel doubles in place; and

FIG. 10 is a fragmentary perspective View of the breaster-jig and the setter gauge.

Basically, the inventive heel breasting apparatus comprises a frame, a band saw adapted to operate in one general position with respect to the frame, reciprocal carriage means adapted to reciprocate to and fro past said blade, and preferably powered by fluid cylinder means, and heel-double jig means on said carriage means adapted to align and securely hold a plurality of heel-doubles for breasting. The jig means includes two side elements positioned diagonally with respect to the line of carriage travel and on opposite sides of the blade.

The side elements align a plurality of heel-doubles to retain them diagonally on a specific angle with respect to the blade. Two end elements of the jig are positioned on opposite ends of the side element. They are adjustable with respect to each other, and thus are adapted to hold a plurality of heel-doubles against longitudinal movement during breasting. The combination of the side elements and end elements form a parallelogram with two obtuse angles and two acute angles. The end members of the jig are adjustable in the direction of movement of the carriage to accommodate varying thickness heel-doubles. The side members are likewise adjustable toward each other diagonally with respect to the direction of movement of the carriage, to accommodate varying length heeldoubles. Adjustment of the side elements may also be necessary to accommodate different thickness doubles. The side elements may include replaceable, inner, stepped plates with steps of different widths to accommodate varying thickness heel-doubles.

A heel guide and separation panel coplanar with the blade and adjacent thereto prevents jamming of divided heel-doubles into the blade on reverse reciprocal movement of the carriage.

The inventive method of breasting heels comprises the steps of stacking a plurality of heel-doubles, spacing each double longitudinally with respect to the adjacent doubles to create a particular stack angle, and sawing the stack through the middle thereof and at said stack angle on a plane dissecting all of said doubles equally, to provide duplicate heels on each side of the blade. Each heel has an unglazed, roughened, angular breasted surface. The invention also comprises a pro-setting device for the breasting jig, including a fixture gauge and a setter gauge. The fixture gauge measures the length of a diagonal stack of doubles regardless of the thickness. The setter gauge enables adjustment of the side jig members to exactly one half of this measured length.

Referring now to the drawings, the novel breasting apparatus 10 includes a band saw mechanism 12 composed of a conventional upper housing 14 in which a conventional rotatable idler wheel 13 for guiding the band saw is located, and lower housing 16 in which a second conventional drive wheel 15 for the band saw blade is located. The blade 19 passes around the lower drive wheel, through the back of the housing, over the upper idler wheel, through an exposed front portion between the housing to allow work to be done thereby. A platform or bed 20 is mounted adjacent the front exposed portion of the band saw blade 19. The band saw is guided in its exposed area by

conventional guides

22 and 24.

Mounted upon platform 20 by suitable means such as bolts 27 is a frame 26 which in the form of the invention illustrated includes an upper level defined by a pair of guide tracks 30 and 3%) (FIG. 2) and a lower level defined by a second pair of

guide tracks

28 and 28. Each track is generally a U-shaped guide facing the cooperating track on the opposite side. A plate-like carriage 36 is guided by

tracks

30 and 30 in reciprocal travel. A similar lower carriage 38 is adapted to reciprocate within

guide channels

28 and 28. As can be seen from FIG. 3, the front U-shaped upper channel 30 is foreshortened to enable access to the lower carriage 38 when in the position illustrated in FIG. 3.

Mounted upon upper carriage plate 36 is a first jig means adapted to hold a series of heel-doubles 52 (FIG. 6). By the term heel-double is meant the starting workpiece which will form two identical heels when severed by the breasting machine. The saw cut is made along the phantom plane shown in FIG. 6. Jig means 50 is essentially a parallelogram with two obtuse angles and two acute angles. It is formed by two side elements 56 and 54 (i.e. in front and back, see FIG. 4), and end elements 58 and 69. The end elements are parallel with each other and at an angle with respect to the reciprocal movement of the carriage as illustrated by the arrow in FIG. 4. Central slot means 66 is provided in the front end element 60, thereby severing ront element 60 into two portions to enable the jig means to pass the band saw blade when the carriage is reciprocated. The rear ele ment 58 includes a pair of upstanding fingers 61 on opposite sides of the centerline. These project substantially above element 58 to hold the heel-doubles straight and true during cutting; and yet enable element 58 to be relatively short for convenient loading and unloading of the doubles into and out of the jig. At least one of the end elements includes elongated slots 65 into which the connecting pins or bolts 64 interfit to allow adjustment of the end elements toward and away from each other. Keyways 69 in the carriage plate and cooperating keys on the end elements assure proper alignment. This enables accommodation of varying thickness heel-doubles.

The side elements 54- and 56 each include an outer support bar 68 which has elongated slots 70 through which bolts are attached to the carriage plate 36 in a similar manner for diagonal adjustment. Removable stepped face plates 72 are attached to each bar es by suitable bolts 74. The side elements can be adjusted relatively toward or away from each other in a diagonal manner with respect to the saw or i.e. with respect to the direction of movement of the carriage plate 36 to accommodate varying length heel-doubles. Each step cooperates with the corresponding step on the opposite face plate to align a heeldouble 52 therebetween. The opposite faces are parallel. The difierent width steps of replaceable face plates accommodates varying width heel-doubles. Therefore, longitudinally adjusting the end plate means, by diagonally adjusting the side plate means and by providing the proper face plates, any size heel-double can be accommodated in the apparatus.

When a plurality of heel-doubles 52 are inserted in the jig means as shown in FIG. 4, they are held longitudinally by the end elements and are positioned and held diagonally and laterally by the side elements. In this arrangement, several heel-doubles can be cut at one time at an exact angle along the phantom plane 53 illustrated in FIG. 6. In the form of the invention illustrated, nine heel-doubles are sawed into eighteen heels in the upper jig means, and nine additional ones are sawed in the lower jig means 84 This lower jig means is identical to the upper jig means as mounted on its carriage plate 38. In FIG. 3, the front element of the lower jig means is removed to show the elongated key slot means 82 in the carriage plate 33.

Each of the carriage plates includes a forward projection 86 adapted to shift a control valve 88 to limit the reciprocal travel of the carriage, i.e. act as a limit switch. In FIG. 2, the upper limit switch 88 is shown shifted, and the lower limit switch S8 is in its unshifted position. Normally, the carriages are controlled to cause one to be shifted to the right, while the other is shifted to the left. This allows unloading and loading of one, while the heel-doubles in the other are being sawed. The

carriage plates

36 and 38 are reciprocated by

fluid cylinders

90 and 92 respectively. The cylinders are mounted on a vertical support plate 94 fixedly secured to platform 213 as shown in FIG. 2. The rods 98 (FIG. 4) of the air cylinders are connected to the carriage plates with suitable couplings 1% interfitting with a T-slot in the carriage plate. Other suitable connections can be used.

The band saw blade 19 extends through an opening 106 (FIG. 2) in platform 21 of the apparatus. Adjacent the band saw blade coplanar therewith and extending to the rear thereof is a metallic plate or panel 119. As illustrated in FIG. 5, this plate 110 is preferably secured by suitable screws 112 to a bar support 114, which in turn is secured by bolts 116 to frame 26 of the apparatus. Welded to this panel is a thin, vertically elongated, metallic platelet or shedder blade 118 which extends adjacent one side of blade 19, but is not attached to the blade. Panel 110 and platelet 118 protect the band saw from being jammed by the sawed heels either during forward or return movement of the carriage. The end edges of this shedder are purposely tapered to prevent the cut heels from snagging it when passing.

A suitable control box 120 includes switch 122 for actuation of the band saw, a second switch 124 for ac tuation of the air source to the cylinders and valves, and an emergency stop switch 126. Box 121) is mounted upon stand 123 extending upwardly from the frame. A pair of manually operated valves or switches 136 and 138 may be utilized for safety purposes, to require both hands of the worker to be placed thereon before actuation ccurs.

Operation When manufacturing shoes, such as the wedge-heel shoes 140 illustrated in FIG. 7, wherein the heel insert 142 is bonded between sole 144 and the main body of the shoe, it is desired to form an angular breasted front heel surface 146 which is not glazed, but rather is slightly roughened. This has been found to provide optimum bonding conditions with an adhesive placed between sole 144 and heel 142. To form the heels 142, therefore, a plurality of the heel-doubles 52 are inserted in each of the jig means 50 and 80 when in their retracted position at the left of the apparatus as illustrated by jig 80 in FIG. 4. Here the upper jig 59 is shown filled with nine heel-doubles and partially shifted to the right so that a couple of the doubles have been breasted. Of course, face plates 72 are provided to suit the particular thickness heel-double, and the side elements and end elements are adjusted diagonally and longitudinally, respectively, to fit the particular thickness and length heel-doubles involved.

Initially, the workman had depressed switch 122 to actuate the band saw, and switch 124 to supply pressurized air to the apparatus. Then by depressing

manual valves

136 and 138, the first cylinder 90 was actuated to retract and pull upper carriage 36 and its jig means 50 to the right. The heel-doubles and jig means are pulled past the moving band saw as shown in process by carriage 36 and jig Si in FIG. 4 to sever the heel-doubles into two equal portions. This provides eighteen identical heels having front breasted surfaces cut an exact angle, and without any glazing. When the upper carriage reaches its maximum position to the right, projection 86 contacts limit switch 88 which halts rod 98 of cylinder 90. An elongated, centrally positioned slot 111 in the carriage, slot 66 in the front end element and a corresponding slot in the rear element allow carriage movement past blade 19 (FIG. 4).

The second and lower jig means 81 is now ready to be loaded. Since upper carriage 36 has moved to the right, the lower jig means is accessible from above as illustrated in FIG. 4 to be loaded with heel-doubles. When it is loaded,

manual Valves

136 and 138 are again depressed by the Workman to cause fluid cylinder 92 to retract and draw the lower jig means, with its contained heel-doubles, past the blade to sever them into identical heels. An elongated slot 113 in the lower carirage enables it to move past the blade. Simultaneously, upper cylinder 99 is actuated in a reverse direction to extend and move breasted heels back to the original position at the left of the frame for unloading. The heels move past panel 11$) and platelet 118 which prevent jamming contact of the heels with band saw blade 19 when moving in this reverse direction. When the heel-doubles return to the original starting position, they are removed by the workman and replaced by a new batch of heel-doubles. By this time, the lower carriage has reached its extreme right position.

Switches

136 and 138 are then again depressed to sever the new batch of heel-doubles in jig S11, and return the lower jig 81 with its breasted heels for emptying and refill.

Utilizing the novel apparatus, it has been found that instead of breasting heels one at a time as with prior art devices, a large number of heels may be breasted simultaneously in a high production manner. Also, the resulting breasted heel is a superior product, since the front surface 146 is not glazed as occurred with the prior shear blade, but rather slightly roughened and textured to provide good bonding characteristics. This texture can moveover be accurately controlled to suit any particular heel material, by controlling the tooth pitch on the blade.

Modification Instead of the stepped construction of

side elements

54 and 56 illustrated in FIGS. 1 through 4, side elements 54' and 56 (FIG. 8) may be substituted. It has been found that in actual practice the thickness of any one length double may vary from batch to batch. This is because the doubles are initially sheared from large sheets of rubber or related materials which often vary in thickness from sheet to sheet. Therefore stepped elements 54- and 5'6 of a specific size step to accommodate one thickness may not interfit well with doubles of another thickness. The rubber doubles must be held securely to prevent movement during sawing since this allows fishtailing of the blade causing the cut heels to be scrap. However, the doubles cannot be squeezed too tightly together since the blade will jam as the cut rubber springs into the kerf. Therefore, if the thickness of the heels tends to vary, it may be more desirable to use the planar wall side elements 54' and 56'. These are diagonally adjustable toward and away from each other on carriage 36. The side elements must also be mounted with one end flush against respective end elements so that the heels will be properly gauged. More specifically, side element 56 includes an inner edge 57' that is longitudinally adjustable through a bolt and slot connection 53' so that forward end 59' can be abutted against end element 69. The rear end 61' of side element 54' is constantly in abutment with end element 58. This abutment feature enables the first, and thus all heel doubles, to be oriented at the exact angle needed since the end and side elements are oriented at the exact predetermined angle using this abutment to align them. The carriage is reciprocable in its tracks 28 and 23' (lower carriage) just as in the first embodiment of the invention.

The side elements cooperate with end elements 58 and 6d, at least one of which is longitudinally adjustable to cause them to be adjustable with respect to each other. Upstanding fingers 63' extend upwardly from rear element 5% for exact holding with easy loading and unloading. The breasting operation of this modified apparatus, with carriage 36 and slot 113 moving past the blade is the same as with the first embodiment.

Pre-Setter The heel doubles must be severed into two exact halves, at the exact angle selected, Without movement of the doubles or pinching of the blade during breasting. Consequently, the side elements and end elements of the jig must be carefully and exactly adjusted prior to operation. This adjustment must not only accommodate the length of each double, but also the diagonal length of a diagonal stack of doubles whi h can vary with heel double thickness variations as well as heel double length variations.

A unique method and device for setting these elements of the breasting jig is illustrated in FIGS. 8 through 10. This device includes both a fixture gauge 156) (FIG. 9) and a setter gauge 152 (FIGS. 8 and 10). The novel pre-setting enables accurate adjustment regardless of thickness and length changes.

The fixture gauge 15% may comprise a base 154 and a vertical support panel 156. Mounted to panel 156 is a platform 15% and a diagonal guide 1641. The guide may include a stepped or planar surface 162 which can be mounted to a bar 164. Platform 158 and guide 152 serve to retain a diagonal stack of heel doubles 52 of the type to be subsequently breasted. The angle of guide 162 to platform 158 is the same as the angle of breasting in the jig. This angle is usually to form a breasted heel where the front breasted surface is 60 to the top heel surface (FIG. 7). A collar 166 is secured to panel 156 and receives a leg 168 slidably movable therein per pendicularly toward and away from guide 162 and the stack of doubles. A foot 171) on leg 158 is adapted to contact the upper edges of the stacked doubles 52. A lock nut and bolt 174 through collar 166 interfits through slot 176 in leg res to lock the leg in any position.

Setter gauge 15?; comprises a first fiat surface 136 adapted to fit against the wall 182 of elongated carriage slot 113, and a second surface 184 parallel to the first and adapted to contact the inner wall of one side jig element e.g. 56'. The second surface must be adjustable with respect to the first. Preferably surface 184 comprises one lateral surface of a projecting lip 188 of a block ele ment 194 and is perpendicular to a horizontal surface 1% adapted to rest on the top of carriage plate 36 when surface 181? is in contact with slot wall surface 182. In its simplest form, surface 1554 may comprise the flat top of the head of a threaded stud 196 threadably connected to block element 194.

Use of Pre-Setter To adjust the

side elements

54' and 56', or 54 and 56, to accommodate a plurality of heel doubles of particular length and thickness, a diagonal stack is placed on platform 158 of fixture gauge 156 with one end in contact with diagonal guide 162 as in FIG. 9. Then, nut 174- is loosened to allow leg 168 to slide through collar until foot 17:1 moves into contact with the corners of the other ends of the heel doubles 52. Nut 174 is then tightened to lock leg 163 and foot in position. The heel doubles are then removed.

The distance between the inner surface points 2% and 202 of the guide 162 and foot 174 is then measured as by inside calipers or by indicator marks on panel 156, on a line perpendicular to the guide 1&2 and colinear with leg 168. This line is perpendicular to the plane dividing the stack into two equal parts and represents the mean distance across the stack. This is the optimum distance between the side jig elements 54' and 56' to breast this particular stack of doubles and is referred to herein as the mean dimension of the stack.

Next the setter gauge is adjusted by rotation of stud 196 to move surfaces 18%) and 184 a distance apart equal to one-half the distance between points 2% and 2%, minus one-half the wi th of slot 113. Slot 113 is on the center line of the carriage which is coplanar with saw blade 19. The width of the slot must therefore be accounted for in setting the pro-setter. If desired, the thickness of the lip might be made equal to one-half the width of slot 113. Then if one-half the distance between points 2% and 2592 is duplicated between surface 134 and the back surface 135 of block 194, the device 152 will give the desired setting when placed in slot 113. The setter gauge 152 is then placed on carriage 35 (FIG. 8) with the lip in slot 113 and surface 156 abutting slot wall 182 (FIG. 10). Side element 56 of the jig is then moved into contact with surface 18-4 and is tightened down. The opposite side element is adjusted by turning setter 152 end for end and placing surface 189 against wall 133 of slot 113 (FIG. 1%). both side elements are then pre-set at exactly one-half the mean dimension of the stack of doubles, to cause the doubles to be breasted into identical halves.

The setter 152 is removed from the carriage and the heel doubles are loaded into the jig. End element as is adjusted to hold the doubles firmly but not too tightly. Thereafter, batches of like doubles can be breasted at length until a diterent thickness and/or length double is encountered.

It will be obvious to those in the art that various modifications of the apparatus can be made within the principles of the invention as taught. Such obvious modifications are deemed part of this invention, which is to be limited only by the scope of the appended claims and the reasonably equivalent structures to those defined therein.

We claim:

1. A heel breasting machine comprising: a band saw blade and driving means therefor; carriage means adapted to reciprocate back and forth past said blade; jig means on said carriage including angular aligning means adapted 'to orient a plurality of heel-doubles at a specific angle with respect to said blade, and longitudinally maintain said heel-doubles equally spaced on opposite sides of said blade; and said jig means including end retaining means adapted to hold a plurality of adjacent heel-doubles against shifting when breasted by said blade.

2. A heel breastin machine comprising: a saw blade mounted to operate in one position, and drive means therefor; jig means adapted to hold a plurality of heeldoubles and move them past said blade; said jig means including lateral facing members having inner faces diagonally arranged with respect to each other across said blade to hold a plurality of heel-doubles at a specific angle with respect to said blade, and equally spaced on opposite sides of said blade to cause said heel-doubles to be sawed into two halves as said jig means is moved past said blade.

3. A heel breasting apparatus comprising: an elongated saw blade and drive means therefor; carriage means adapted to reciprocate back and forth past said saw blade; holding jig means mounted to said carriage; said jig means including facing members mounted diagonally with respect to said blade and equally spaced from said blade on opposite sides thereof; and adjustable, longitudinally spaced holding means to firmly hold a plurality of adjacent heel-doubles against movement during breasting by said blade.

4. A heel breasting machine comprising: a band saw blade and means to drive said blade; carriage means adapted to reciprocate past said blade; a parallelogram jig means mounted on said carriage and including centrally located slot means allowing said jig means to pass said saw blade; the side walls of said jig means comprising stepped led es corresponding in a diagonal fashion with each other across said blade; said corresponding ledges adapted t hold a plurality of heel-doubles equally spaced across said blade and at a specific angle; and the ends of said jig means adapted to retain the heel-doubles during angular breasting thereof by said saw blade.

5. A heel breasting machine comprising: a band saw blade and means to drive said blade; carriage means adapted to reciprocate past said blade; a parallelogram jig means mounted on said carriage and including centrally located slot means allowing said jig means to pass said saw blade; the side walls of said jig means adapted to hold a plurality of heel-doubles equally spaced across said blade and at a specific angle; and the ends of said jig means adapted to retain the heel-doubles during angular breasting thereof by said saw blade.

6. A heel breasting machine comprising: a vertically movable saw blade and driving means for said blade; a horizontally reciprocable carriage adapted to move to and fro past said blade; diagonally oriented jig means on said carriage and extending on opposite sides of said blade; said jig means having means to hold a plurality of eel-doubles at a specific predetermined angle across said blade and a group to enable breasting thereof at said angle into two identical heels.

7. A heel breasting machine comprising: a band saw; a frame around a portion of the saw blade; cooperating track means on opposite sides of said blade; a carriage adapted to reciprocate past said blade on said track means; a parallelogram jig on said carriage means and adapted to align and hold a plurality of heel-doubles at an angle with respect to said blade and equally divided on opposite sides of said blade; fluid motor means mounted to said frame and adapted to reciprocate said carriage and jig means past said blade; and heel-guide panel means coplanar with said blade and extending in the direction of movement of said carriage and cooperating with said blade and jig means to prevent breasted heels from snagging on said blade during return reciprocal movement of said carriage.

8. A heel breasting machine comprising: a band saw; a frame around a portion of the saw blade; cooperating track means on opposite sides of said blade; a carriage adapted to reciprocate past said blade on said track means; a parallelogram jig on said carriage means and adapted to align and hold a plurality of heel-doubles at arr angle with respect to said blade and equally divided on opposite sides of said blade; and fluid motor means mounted to said frame and adapted to reciprocate said carriage and jig means past said blade.

9. A heel breasting machine comprising: a band saw blade; a carriage adapted to reciprocate back and forth past said blade; jig means on said carriage having two end elements and two side elements in the form of a parallelogram having two obtuse angles and two acute angles; said two end elements being adjustable in the direction of the carriage movement; and said two side elements being adjustable diagonally with respect to the direction of said carriage movement; said side elements providing angular alignment and retention of a plurality of adjacent, heel-doubles on a diagonal for severance thereof by said blade into a plurality of identical heels, each having a roughened, angular breasted front surface.

10. A heel breasting machine comprising: a saw blade and means to drive said blade; carriage means adapted to reciprocate past said blade; a parallelogram jig means mounted on said carriage and including centrally located slot means allowing said jig means to pass said saw blade; the parallel sides of said jig being diagonally adjustable toward and away from each other; the parallel ends being adjustable toward and away from each other; and a portion of at least one side element being longitudinally ad justable toward an end element to abut said end element for proper angular orientation of said side and end elements.

11. A heel breasting machine comprising: a saw blade and means to drive said blade; carriage means adapted to reciprocate past said blade; a parallelogram jig means mounted on said carriage and including centrally located slot means allowing said jig means to pass said saw blade; the parallel sides of said jig being diagonally adjustable toward and away from each other; the parallel ends being 1 adjustable toward and away from each other; and at least one of said parallel end members including upstanding,

centrally located alignment fingers to hold heel doubles aligned While allowing said end elements to be relatively low for easy loading and unloading of heels into said jig.

References Eited in the file of this patent UNITED STATES PATENT S 453,376 Murray June 2, 1891 631,114 Hulse Aug. 15, 1899 l,352,745 Hart Sept. 14, 1920 2,045,329 Lyon June 23, 1936 2,187,825 Clarke Jan. 23, 1940 2,227,883 Grose Jan. 7, 1941 2,448,354 Cintron Aug. 31, 1948 2,470,254 Lee May 17, 1949 2,799,939 Bivans July 23, 1957 3,015,891 Larson Jan. 9, 1962

Claims

1. A HEEL BREASTING MACHINE COMPRISING: A BAND SAW BLADE AND DRIVING MEANS THEREFOR; CARRIAGE MEANS ADAPTED TO RECIPROCATE BACK AND FORTH PAST SAID BLADE; JIG MEANS ON SAID CARRIAGE INCLUDING ANGULAR ALIGNING MEANS ADAPTED TO ORIENT A PLURALITY OF HEEL-DOUBLES AT A SPECIFIC ANGLE WITH RESPECT TO SAID BLADE, AND LONGITUDINALLY MAINTAIN SAID HEEL-DOUBLES EQUALLY SPACED ON OPPOSITE SIDES OF SAID BLADE; AND SAID JIG MEANS INCLUDING END RETAINING MEANS ADAPTED TO HOLD A PLURALITY OF ADJACENT HEEL-DOUBLES AGAINST SHIFTING WHEN BREASTED BY SAID BLADE.