US2551773A - Machine for operating on shoe lasts - Google Patents

Description

May 8, 1951 l.. E. TOPHAM 2,551,773

MACHINE FOR OPERATING 0N SHOE LAsTs Filed March l0, 1945 '7 Sheets-Sheet 2 May S, 95l E. ToPHAM MACHINE FOR OPERATING oN sHoE LAsTs Filed March l0, 1945 '7 Sheets-Sheet 5 WNY 'zven to?" 4lkzwjence El pham May 8, 1951 L. E. TOPHAM MACHINE FOR OPERATING oN sHoE LAsTs 7 Sheets-Sheet Filed March lO, 1945 lll-lll!! May 8, 1951 E. ToPHAM Y 2,551,773

MACHINE FOR OPERATING 0N SHOELASTS Filed March lO, 1945 7 Sheets-Sheet 5 tor Iczurnce E To'bham May 89 E951 E. TOPHAM 2,551,773

MACHINE FOR OPERATING ON SHOE LASTS Filed March lO, 1945 '7 Sheets-Sheet 6 L. E. TOFHAM MACHINE FOR OPERATING ON SHOE LASTS May 8, 1951 '7 Sheets-SheetY '7 Filed March 10, 1945 Patented May 8, 1951 UNITED STATES PATENT OFFECE MACHINE FOR OPERATING ON SHOE LASTS Laurence E. Topharm Wenham, Mass., assigner to United Shoe Machinery Corporation, Flemington, N. J., a corporation of New Jersey Application March 10, 1945, Serial No. 582,011

13 Claims.

This invention relates to a machine for making shoe lasts and is particularly concerned with drilling a last to provide the commonly known thimble hole at a predetermined point in the heel end of the last.

The location of the thimble hole in a last is critical since the last during the processing of a shoe thereon in a shoemaking machine is usually supported on a spindle which is part of the machine and enters the thimble hole of the last both to support the last and to position it with relation to the shoe machine, and more particularly with relation to the shoe engaging operating instrumentalities of that machine.

There are other reasons for accurately determining the location of the thimble hole to be drilled. It is a Well-known fact that lasts of the same size but of diierent styles may diier considerably in length. As a rule the range of length variations of lasts of the same size, due to style dierences, amount to 1%. It is furthermore a fact that with lasts of the same size but diierent style the heel ends are practically the same and the foreparts only are subject to length variations. This has given rise to the thought to make the lasts in tWo parts connected by a hinge joint (usually such lasts are referred to as hinged lasts or jointed lasts) and to make the heel ends of such lasts interchangeable so that one and the same heel end may be used in connection with foreparts of lasts of different styles provided they are of the same size.

Locating the point at Which the thimble hole is to be drilled in a series of lasts of different styles but of the same size therefore is simple, since the heel ends of these lasts are substantially identical solids. Locating the thimble hole point in lasts of diiierent sizes, irrespective of style, is also a relatively simple procedure because the dimensional variations of the heel ends of the lasts of different sizes are merely the direct result of the last size variations and are not aiected by style variations in contrast to the foreparts of such lasts.

The size variations of the last are based on either an arithmetical grading system or a geometrical grading system. In accordance with the arithmetical grading system the size variations are by constant increments so that the different last sizes are arrived at by adding equal amounts to or subtracting them from the length of a model size last (usually size 4). As to the geometrical grading system, it is to be noted that the size variations are proportional, that is, the diiierent last sizes are arrived at by multiplication (Cl. P14- 93) with or division by a constant, for example, 3% of the stick length (overall length as measured on the stick) of each last.

It is an object of this invention to provide a suitable means for locating or finding the proper point, at the heel end of any geometrical graded jointed last, where the thimble hole is to be drilled and drilling the thimble hole. It should be noted that a jointed last usually has a V- shaped notch at the joint. This notch, in a preferred last construction, provides a surface which has a xed relation to the center of the last joint, the latter dividing the forepart and the heel end of the last in a fixed proportion for a series of lasts of a given or standard style. By means of this surface at the joint the last may be accurately positioned in a shoe machine.

In accordance with an important feature of the invention, the thimble holes to be drilled in a series of lasts of the same size, irrespective of style, are located at equal distances from the positioning faces or locating faces at the joints` of the lasts. In drilling lasts of different sizes, irrespectivev of style, the location of the thimble holes is so selected that the distances of the thimble holes from the positioning faces are geometrically related, the ratio of increase or decrease of these distances being the same as the ratio by which the heel end of the last is graded. As stated, the size variations of the heel ends of the lasts are not affected by style variations and hence the dimensions of the heel ends of the lasts are either a multiple or a divisor of the corresponding dimensions of the heel end of the sample last of the standard series. In the present instance the sample last of the standard series is divided, as measured along its turning axis, be-l tween its toe end and the center of the vjoint on one hand, and that center and the thimble hole on the other in the proportion of 7:3. As a re sult the heel ends thus processed may be interchanged in lasts of the same size regardless of style. This, of course, is of considerable practical and economical advantage. Moreover, this permits a considerable simplication of heretof fore complicated mechanisms provided in shoe machines for adjusting the operating instrumentalities to accommodate lasts of different styles as Well as of diierent sizes. The above-mentioned turning axis or turning center is a straight line beginning in the last bottom beneath the toe end and extending through the center of the joint. v

The inventionin its machine aspect provides a drill and movable last support which engages the above-mentioned positioning face of the last mounted thereon. The last support is so controlled that it positions the heel end of the last accurately over the drill and more specifically that the aXis of the thimble hole to be drilled is located from the positioning face of the last a distance which is either the same as the corresponding distance of the sample size last, or which is geometrically related to it in that it varies therefrom in proportion to the rate or percentage of variation of the length of the heel end to be drilled from the heel end of the sample: last irrespective of style. The proper location of the heel end of the last over the drill is indicated by a movable abutment plate which when it contacts the toe end of the last on the support indicates that the last is properly located over the drill. To attain this result the toe abutment is mounted on a support which moves ten dimensional units for three dimensional units of the last support (in keeping with the '7:3 dimensional ratio of the standard last). rlhe reason for moving the toe abutment ten dimensional units is that the entire last (including the forepart) is moved three dimensional units to allow for the variation of the length of the heel end and that the length variation of the forepart itself comprises seven dimensional units. Since the foreparts of lasts of the same size but diferent styles generally diiier in length as compared with the standard last (socalled long lasts or short lasts) provision is made to move the toe abutment with relation to its support on drilling lasts other than standard styles so as to correct length discrepancies due to style variations. This relative movement is under the control of a pantograph mechanism Which is adjustable for different last styles.

In accordance with another feature of the invention, the illustrated machine is provided with additional mechanisms for adjusting the last support in the machine. In particular, mechanism is provided for adjusting the last support in an arcuate path about an axis transverse to the longitudinal direction of the last supported thereon and extending through the center of the last joint. 'Ihere is provided additional adjusting mechanism by means of which the last may be adjusted laterally in an arcuate path about the turning axis. Finally, the support may be adjusted rectilinearly in a direction transverse to the supported last. As will be noted, these various adjustments serve to position the last laterally and angularly with relation to the drill.

In accordance with another feature of the invention, the illustrated machine is provided with a holddown which serves to support the last against the operative thrust of the drill and which is so constructed and arranged that it is moved into its operative or last-engaging position by operator-controlled mechanism such as a treadleoperated link and lever mechanism and automatically locked in that position, whereupon as a result of a, continued operation of the operatorcontrolled mechanism the continuously rotating drill is advanced to drill the thimble hole into the heel end of the supported last.

These and other features of the invention wl now be described in detail with reference to the accompanying drawings and will be pointed out in the appended claims.

In the drawings:

Fig. 1 is a view in side elevation of the upper portion of a last drilling machine embodying features of the present invention;

Fig. 2 is a view in front elevation of the last.

supporting and positioning mechanism of the machine illustrated in Fig. 1;

Fig. 3 is a detail view, in section, of last positioning mechanism;

Fig. 4 is a plan view of the mechanism shown in Fig. 2 with the last and its immediate support omitted;

Fig. 5 is a detail View, in front elevation, of mechanism for locking the last t0 its support;

Fig. 6 is a View, substantially in front elevation, of the entire last drilling machine;

Fig. 7 is a detail view in front elevation of a holddown mechanism and drill elevating mechanism associated therewith;

Fig. 8 is aplan view of the parts substantially as shown in Fig. 7; and

Fig. 9 is a diagrammatic View illustrating the function of the pantograph mechanism.

The last L illustrated in Fig. 1 of the drawings comprises two parts, namely, the forepart F and the rear part H, the latter being more commonly known as the heel end. Both last parts F and H are connected together by a hinge joint and it is for this reason that lasts of this type are referred to as hinged lasts or jointed lasts. The center of the hinge joint is indicated at c. In order that the last may be broken about the center c of the hinge joint so as to shorten the last and facilitate its insertion into or removal from a shoe, there is provided a V-shaped notch at the joint. The notch normally separates the upper portion of the forepart F from the upper portion of the heel end H. The rear face of the forepart F at the notch has a finished surface p the relation or distance of which from the center c of the joint is the same in al1 lasts of this type regardless of style or size Variations. This iinished surface p serves as a positioning or locating surface by means of which the last may be accurately positioned with relation to operating instrumentalities. It should be noted that the positioning face p is located at a point in the last surface having a predetermined relation to a dimensional characteristic of the last such as the distance of the center c of the last joint from the toe end of the last or the distance of the joint center c from the rear end of the last, or the distance of the joint center c from the axis d of the thimble hole in the last. As will be seen, the distance between the axis d of the thimble hole and the positioning face p remains proportionally the same with all lasts of all series, or, in other words, with all lasts of diierent sizes and styles.

The illustrated last L is a so-called short last; it is shorter than the standard last of the same size. Reversely, a long last is longer than the standard last of the same size. These variations of last lengths from standard dimensions are due to style variations. As pointed out in United States Letters Patent No. 1,948,547, granted February 27, 1934, on an application filed in my name, last styles may vary considerably from standard dimensions; the range of variations being about 11/3. Considering the standard last to be about in the middle of the range of variations, often referred to as last extensions, lasts of the same size but of dierent styles thus would vary about 2/3" in either direction as considered from the standard last. In actual practice it is said that mens lasts mostly are over the stick meaning that the lasts are extended beyond the dimensions of the corresponding standard lasts. Womens lasts are often under the stick. As stated in my said patent, a 7C model of a last will measure anywhere from 7 to 11 on the size stick depending on its style, that is to say, it may be anywhere from 10"/12 to 1111/12" in length. The length dimensions of the lasts are usually measured and determined along the turning center t. As indicated in Fig. 1, the standard last corresponding in size to the illustrated short last extends from the dash line S to the rear end of the illustrated last. The distance in the standard last between the joint center c and the axis d of the thimble hole is indicated by a, and the distance between c and the toe end s is indicated by b.

As above stated, it is one of the objects of this invention to bore thimble holes into thev heel ends of lasts at a predetermined point in 'such a manner that the heel ends of lasts of the same size thus bored may be interchanged regardless of the last styles and that the positioning of any last thus processed in a shoe machine by means of the commonly used spindle entering the thimble hole as well as the adjustment of the last or shoe-engaging operating instrumentalities with relation to the last or shoe is considerably facilitated.

The illustrated last and any other last of different seres and sizes to be processed in accordance with my invention are geometrically graded. In the standard last series the distance as measured along the turning center t between the point (indicating the intersection of the axis d of the thimble hole or of the drill for boring the thimble hole and the turning center t) and the toe end s of the last is dividedby the center c of the joint in the ratio of 3:7, the distance a between c and :n having the three linear or dimensional units and the distance b between c and s having the seven linear units. Lasts of different sizes but of the same standard series have the same dimensional characteristics in that the distances between the points s and :i: are all divided by the point c in the ratio of 3:7 even though the distances between s and :z: differ with different last sizes; thus these distances are geometrically related. Lasts of the same size but diierent styles have different ratios depending on whether the lasts are short or long lasts. The fact is that the seven dimensional units of the foreparts F of lasts of the same size but different styles vary due to style variations, but the three dimensional units of the heel ends H do not vary due to style variations. With Vlasts of different styles and sizes the dimensional variations of the heel ends H are proportionate to size variations, that is to say, the dimensions of the heel ends H are either increased or decreased by a iixed percentage of a dimensional.` characteristic such as the overall length andare not affected by style changes as are the foreparts F of such lasts.

Expressed mathematically, the formula for the standard last of model size (usually size 4) is a;b= 3-3% of amv-3% of 7) In a long last of the same size as the model standard last the formula is azh=3z7 plus the increment of variation of this particular long last from standard. In the following the increments of variation are called i. With the next larger size last of this long last series the formula would be smaller size from the model standard last under consideration the formula is Considering now a short last series the formula for a last of the same size as the model standard last under consideration is With the next smaller last of this short last series the formula would be This clearly illustrates that the dimensional variations of the heel ends H of all lasts of diierent sizes and styles are merely the direct and proportionate results of last size variations and are not affected by style variations; thus there is a direct geometrical relation between the various heel end sizes. Hence the axis d of the thimble hole of the heel end H of any last L may be located a distance from the center c of the joint as measured along the turning center t which is geometrically related to the distance a (three dimensional units) between c and of the model standard last or to the distances between c and :c of the corresponding sizes of standard lasts.

Since, as pointed out, the positioning face p has a predetermined, invariable relation to the center c of the joint, it may be said that the distance between the axis d of the thimble hole to be drilled and the positioning face p of any last L is geometrically related to the distance between the corresponding points of any other last of any of the series. Accordingly, in drilling lasts of the same size but of different styles, each last is so located with relation to the drill that the distance between the center c of the last joint or the positioning face p on one hand and the axis of the drill is the same as in the standard last of that size and, in the case of size variations, that distance is varied only in accordance with the ratio or percentage of last size variations as basedvon the same standard grading factor (such as e. g. 3%).

Assuming the sample last of the standard series is the size 4 last, the size 4 last of anyvother style has the identical heel end dimensions and the lasts of all other sizes of any styles have heel ends the dimensions of which are geometrically related to the dimension of the size 4 last of the standard series, in that the dimensional variations are 3% of the distance c-x in each case. It is therefore possible to locate the thimble hole axis d accurately and expediently.

Taking the distance a between c and a: of the heel end H of the model last 4 of the standard series as a basis having the value 3, the distances between the corresponding points c-x of the heel ends H of all lasts of all style series can be easily and accurately obtained in that the corresponding distances of the next larger size lasts regardless of style would be 3.09. The following larger size lasts have their corresponding distances (1.03)2 as long as standard, or 3.18 etc. Reversely, the last size next smaller from the model size is as long as the model size last or 2.91. The dimensions of the following smaller size lasts are as long as the model size last or 2.83 etc. Thus the dimensions c--r of the heel end I-I of any last L can be expressed by ((1.03) 7)a if the last is of a larger size than the model last, or by (miser if the last is of a smaller size than the model last, wherein n is the difference between the size of the last to be drilled and the size of the model last. Thus, if the model last is size 4 and the last to be drilled is size '7, n is 3.

The illustrated drill jig serves to bore thimble holes into lasts of the above-described type at a point in the heel end H of each last which is predetermined and determinable in the manner described irrespective of different last styles and sizes. As pointed out, the point in the surface of the heel end H at which the operating instrumentality, such as a drill, engages the last is f determined with relation to the center c of the last joint or the positioning face p, the latter being maintained at a xed relation to the center c as previously explained. As will be described, the relative positioning of last and drill in the illustrated machine is automatic.

The frame of the illustrated machine comprices a base Ill (Fig. 6) to which is secured an upright column I2. For supporting the drill head of the machine there is provided a bracket I4 (Figs. l, 6, 7 and 8). The bracket I4 is clamped to the column i2 by bolts I6 and extends radially therefrom. For carrying the last supporting and positioning mechanism a bracket I8 is provided which is also secured to the column I2 and extends radially therefrom at an acute angle to the bracket I4. Both brackets I4 and I8 are secured together by vertical screw bolts 20.

The operating mechanism of the illustrated machine comprises an upwardly extending, vertically movable rotary drill 22 (Figs. 1, 6 and 7) which is secured in a chuck 24 provided on the upper end of a rotary drill shaft 26. The axis of rotation of the shaft 28 and hence of the drill 22 is identified as d in Fig. 1. The shaft 26 yhas an enlarged portion 28 which is rotatably mounted and axially slidable in a bearing provided in the bracket I4. The lower end of the shaft 26 car.- ries a bank of stepped pulleys 30 of different diameters and hence peripheral speeds. The pulleys are splined on the shaft 26, the arrangement being so that the pulleys 30 are constrained to rotate with the shaft 26 but the shaft can move in the direction of the axis of rotation with relation to the pulleys 30, this to feed the drill 22 into the work. The pulleys 3E] are driven by a belt 32 connecting a selected one of the pulleys 3B with a selected pulley of a similar but inverted bank of stepped pulleys 3G secured on the rotor shaft of a motor 36. The motor 36 is fastened to an extension 38 of the bracket I4. The entire driving mechanism is shrouded by a housing 4D. The drill 22 rotates continuously so long as the motor 36 is kept running.

To operate the drill so as to cause it to bore a thimble hole into a last presented to the machine, the drill shaft 25 is elevated as a result of the depression of a treadle 42 (Fig. 6), as will be described.

The treadle in being depressed performs or initiates other operations such as causing certain mechanism to hold the last against the thrust of the drill, as will be pointed out in detail. The treadle 42 is pivotally secured at 44 to a small bracket 46 fastened to the column 2.

The last supporting and positioning mechanisrn, as stated, is carried by the bracket i3. To this end the bracket I8 is provided with a support 5i] (Figs. 1 and 2) having a dove-tailed guideway for a slide 52. The slide 52 is movable horizontally and rectilinearly in the direction of the longitudinal axis of the bracket I8 with relation to the support 5D. To move the slide 52 it carries in suitable bearings a shaft 54 to the freely extending end of which a hand whec is secured by a set screw or the like. The shaft 54 has fastened to it a pinion 58 extending through an aperture in the slide 52 and meshing with a rack 65 provided in the top face of the dove-tailed portion of the support 5G.

Rotation of the hand wheel 56 in one direction or the other thus causes movement of the slide 52 with relation to the support As will be presently described, the slide 52 carries additional mechanism for supporting and adjusting a last support P (Fig. l). rlhe last support P maintains the last in such a position that the longitudinal axis of the supported last or the turning center t extends transversely to the direction of movement of the slide By adjusting the position of the slide 52 the last as a whole is adjusted transversely of the turning center t in a rectilinear horizontal path.

The supported last L is also adjustable angularly about an axis extending through the center c of its joint, the adjustment taking place in direction transversely to the turning center t. For this purpose the slide 52 is provided along,r one side thereof with an arcuate slideway G2 the center of curvature of which coincides with the center c of the supported last. The slidewu,Y 62 has an undercut at its inner side and is confined at the outer side by an arcuate plate secured to the side face of the slide 52 by screws 53. Engaged in the slideway 62 is a slide '3o which is movable with relation to the slide and the arcuate plate 64. The latter has on its outer face a scale of theangular values of the curvature ci the slideway 62 including a zero mark. The slide 68 also is provided with a zeio mark and when assivs the two zero marks are in register, as shown in Fig. 2, they indicate that the slide 58 is in its normal position of adjustment. As will be noted, upon adjustment of the slide 03 the last support P and last L thereon are adjusted angularly and transversely to the turning center t of the supported last and about an axis extending through the'center c of the joint of the supported last.

For the purpose of moving the slide 08, the slide 52 is provided with a horizontal tapped bore 10 (Figs. 2 and 3) extending in the general direction of the slideway 62. A rotatable screw bolt 'I2 is in threaded engagement with the bore 'i0 and has secured to its outer end a hand wheel 14 by means of which the screw bolt 'i2 may be rotated. The screw bolt '|2 is held against axial movement by being provided with a flange 16, one face of which lies against the outer face of the slide 52. The flange 16 is received in a circular recess 18 provided in a block 80 which is bored to accommodate the freely extending end of the bolt |2. The block Se rests against the outer face of the slide 52 and is secured in place by screws 82. The hub of the hand wheel 'i4 bears against the block 80. The slide 68 is provided at its lower face with a segmental rack 84 (Fig. 2) with which the thread of the screw bolt '|2 meshes. Thus, on rotation of the screwbolt 12 in one direction or the other by means of the hand wheel 14, the slide 68 is moved with relation to the slide 52 in one direction or the other.

The supported last L is also adjustable angularly in or parallel to the vertical plane through the turning center t of the last, the adjustment taking place about an axis extending transversely to the last through the center c of the last joint. To this end, the slide S8 is provided with an arcuate slideway 80 which extends along one side of the slide i in a direction at right angles to the slideway 02. The slideway 86 is formed by an undercut at its inner side and is coniined at its outer side by an arcuate plate 88 which is secured by screws 90 to the slide 08. The slideway 86 is engaged by a slide 92 which accordingly is movable in an arcuate path in or parallel to the horizontal plane through the turning center t of the supported last about the center c of the last joint. The plate 88 is provided with a scale of the angular values of the curvature of the slideway 86. The slide 92 is provided with a zero mark which when in registration with a zero mark or index mark on the scale of the plate 88 indicates that the slide 92 is located in its normal position of adjustment. Thus the last support P carried by the slide 92 and the last L supported on the last support P are adjusted by the adjustment of the slide 92 in or parallel to the vertical plane through the turning center t of the supported last angularly about the center c of the supported last. For the purpose of moving the slide 92 it is provided at its lower face with a segmental rack 94 (Fig. l) which meshes with an elongated pinion 96 on a stub shaft 08 rotatably mounted in the slide 68. To the freely extending end of the shaft 98 is secured a hand wheel |00. Rotation of the hand wheel in one direction or the other thus causes movement of the slide 02 in one direction or the other.

The upper portion |02 of the slide 92 is T- shaped in cross-section, as best illustrated in Fig. 2, and is provided with a iiat supporting face |04 for a table |06 secured thereto by bolts I 08. The table |06 has out into its upper surface two parallel dove-tailed guideways ||0, ||2 (Fig. 2) in which are received two slides H4, .l i6 (Figs.

2 and 4). The slide ||4 carries the last support P. A groove ||8 is provided in the slide ||4 and in that groove fits a portion of a base |20 of the last support P. The base |20 is secured to the slide ||4 by bolts |22. The last support P comprises an upright casing |24 (Figs. 1 and 5) which is secured to or is a part of the base |20. The casing |24 is V-shaped and fits into the V- notch of the last L, thus supporting the last bottom up and presenting it to the drill 22. The front face of the casing |24 is smooth and engages the positioning face p of the last. To hold the supported last L rmly on the last support P it is locked thereto, as will be presently described. Mounted in the casing |24 is a stub shaft |26 which may be rotated by a handle |20 secured to it. The stub shaft at one end thereof carries an eccentric |30 which is surrounded by a strap |32. The upper end of the strap is in the form of a hook |34 that may be caused to engage the hardware of the supported last L by movement of the handle |23. The casing |24 is closed at its rear end by a plate |36 (omitted in Fig. 5) which is secured to the casing |24 by screws |38.

The slide I4 is movable relatively to the table |06 and, consequently, the last support P with the last L thereon is movable with relation to the table |00 and with relation to the drill 22 so to locate the last in the machine that the drill 22 will bore a thimble hole into the heel end H of the last at the proper point, as above described.

To position the last properly with relation to the drill 22 a pantograph-controlled toe gage mechanism T (Fig. 1) is provided which is so constructed and arranged that, when the toe end of the supported last L is engaged by a movable toe gage, the last is properly located over the drill 22. The toe gage mechanism T is carried by the slide H6. To this end the slide ||6 has secured to it an upright plate-like support |40 (Figs. l and 2) for the toe gage mechanism T and the pantograph mechanism associated therewith. The support |40 has an enlarged upper end |42 in which is provided a slideway for a slide |44. The slide |44 carries a toe plate or toe gage |46 extending laterally from one end of the slide |44 and adapted to engage the toe end of the last L supported in the machine. As will be explained, the slide |44 with the toe plate |46 secured thereto is movable relatively to the support |40 to accommodate lasts of different styles.

The two slides ||4 and H6 supported in the table |06 are movable at different rates of speed with relation to each other. In the illustrated example, the slides H4, H5 are movable at a ratio of 3:10. The reason for this arrangement may be explained best in considering rst a last of standard style in which, as above explained, the distance between the toe end s and the axis :t of the thimble hole is divided by the center c of the last joint in the ratio of 3:7. The last being a geometrically graded last, its size increases or decreases are proportional to a fixed dimensional characteristic of the last, for example, 3% of the stick length of each last. Considering the heel end H and the forepart F of this last separately, it will be noted that the dimensional increases or decreases of the last as a whole correspond to dimensional increases and decreases of the heel end I-I and the forepart F separately in the same proportion. In other words, the heel end H of the standard last of the next larger sizehas dimensional character- "il istics which constitute an increase of 3% of the same dimensional characteristics of the heel end H of the last under consideration. The same holds true with regard to the forepart F. Since the iorepart F is considerably longer than the heel end I-I (the distance b or the forepart F has seven dimensional units as compared with the three dimensional units of the distance a of the heel end H of the last), it is clear that the increment of increase or decrease of the last forepart F is larger than the increment o1" increase or decrease or" the heel end H when both parts are considered separately. Consequently, in moving the last support P 3% of the distance a to position the standard last of the next larger size, the toe plate |558 of the toe gage mechanism T must be moved 3% of the distance b and, in addition, 3% of the distance a to allow for the movement of the last. In other words, while the last support P moves three dimensional units, the toe gage must move ten dimensional units so as to gage properly the next larger last of the standard series. This explains the differential .movement of the slides H4, H6 in the ratio of The diilerential movement of the slides ||4 and l it is caused by a common adjusting differential mechanism. To this end the table |86 is provided at opposite sides with brackets |50, |52 (Fig. e) which contain bearings for a shaft |54 extending transversely to the longitudinal direction oi the table |06 and the slides H4, ||6 movable therein. One end of the shaft 54 has secured to it a hand Wheel |56. Secured on the shaft in spaced relation from each other are two pinions |58, |55 (Figs. 2 and 4) of diierent diameter. The diameters of the pinions |53, |50 are so selected that upon rotation of the shaft |54 by means of the hand wheel |55, the rotary motion of the shaft may be transmitted by the pinions |56, |63 in the ratio of 3:10. The smaller pinion |58 meshes with a rack |2 (Figs. l and 4) which is provided on the top face of a block engaged in the previously mentioned groove HE of the slide H4 and bolted to the slide. The larger pinion itil meshes with a rack |64 provided on the top' face of a block |65 which is in engagement with a groove |70 provided in the slide |56 and is bolted to the slide H6. Accordingly, on rotation of the hand wheel |56 in one v direction or the other, depending on Whether an adjustment for the next larger or the next smaller size last is being made, the slides l I4, H6 are moved by this differential mechanism in one direction or the other in the ratio of 3:10. As soon as the toe plate |45 engages the toe end of the last, the last support P has moved the last into a position in which it is properly located over the drill 22 for the ensuing drilling operation.

1t should be noted that the above-described differential movement of the last support P and the toe gage mechanism T in the ratio of 3:10 is adequate only when operating upon lasts of standard styles. However, this ratio of moveent is inadequate when operating upon lasts of styles which diler from standard, such as the above-mentioned long lasts or short lasts. More specically, while the extent of movement of the last support P remains the same, that is to say, it is either an increase or decrease of 3% of the distance c-.r of the heel end H of the last, the movement of the toe plate |46 of the toe gage mechanism T needs to be corrected. It is to this end that the toe plate |46 and its supporting slide 12 |44 are movable with relation to the support |40, as mentioned above.

Considering once more the above-developed formulas for lasts of next larger and next smaller sizes oi the standard last series, the long last series and the short last series, it Will be appreciated why the movement of the toe plate |46 must be corrected when gaging lasts of styles different irom standard. It is the purpose of the above-mentioned pantograph mechanism associated with the toe gage mechanism T to modify the movements of the toe plate |46 by moving it relatively to the support |40 which, since it is secured to the slide i I6, has a movement of its own. The pantograph mechanism is so constructed and arranged that it automatically modilies the movement of the toe plate |56 when setting the toe plate to operate upon lasts which diier in style from the standard style series.

As pointed out, grading geometrically means increasing or decreasing by multiplication by a constant, for example, 3% of the stick length of each last. Thus, a short last is graded 3% of itself and the amount of increase or decrease between two successive sizes of the short last is less than the increase or decrease between the corresponding sizes of a standard last, namely, 3% of the seven dimensional units of the orepart F minus the increment of variation of the last style from the standard last series. With a long last the increase or decrease between two successive sizes is more than the increase or decrease between the corresponding sizes of a standard last. Since the amount of decrease is less with a short last than with a standard last, the apparent anomaly seems to exist that the short last is relavely longer than the standard last or the same size. Again, since the amount of decrease is more with a long last than with a standard last, the long last is relatively shorter than the standard last of the same size. Let us assume merely for the sake of explanation that a standard last of a given size has a stick length of 10, a long last oi the same size a stick length of 11, and a short" last o1" the same size a stick length of 9". The amount of decrease or increase of the standard last is 3% of l0 or .3. The long last decreases or increases 3% of 11 or .33 and as compared with the standard last it decreases or increases at a faster rate than the standard last. The short last decreases or increases 3% of 9 or .27 and as compared with the standard last it decreases or increases at a slower rate than the standard last.

The above-mentioned pantograph mechanism is illustrated in Figs. l, 2 and 4 of the drawings. It comprises a bell-crank lever |72 which is mounted for swinging movement about a pivot stud |74 secured in the enlarged upper end |42 of the support |550. Secured to the lower end of the vertical arm of the bell-crank lever |72 is a gear segment |75 (Fig. l) which meshes with a pinion |78 secured on a horizontally extending shaft |80. The shaft |80 is mounted in suitable bearings in the support |40. A gear |82 is secured to the outer end of the shaft |80 and meshes with a rack |313 provided on an extension of the block |68 which, as described, is secured to the slide H4. Consequently, upon movement of the slide I4 for size adjustment of the toe plate |46, caused by a rotation of the hand wheel |56, an angular movement may be imparted to the bell-crank lever |72 with results to be described. The upper end of the inclined arm of the bellcrank lever |72 has a lateral extension |86 (Figs.

v.2 and 4) which bridges the upper end |42 of the support |40 and which is connected by ya link |88 and a pivotstud to a link |92. The link |92 in turn is pivotally secured by a stud |94 to one end of the `slide M4 which, as explained, carries the toe plate i136 of the toe gaging mechanism. An angular movement of the bell-crank lever |12 therefore produces a movement of the slide |44 ,and the toe plate i145 with relation to the support lilil, provided that the stud |90 is not adjusted t0 be in axial alinement with the stud |14. If lthe studs i114 and |90 are axially alined, an angular movement of the bell-crank lever i12 does not cause any movement of the slide |44 with relation to the support |40, as may be readily seen.

To adjust the position of the stud |90 it is connected by means of an arm IBS and a pivot screw i to a slide 200 (Fig. 1) which isadjustable along a curved slot 202 provided in a segment member 204; The slide 200 is held in adjusted position by the screw |08 which causes, When tightened, the slide 200 to bind in the curved slot 202. The purpose of the adjustment of theslide 200 will be described later. The segment 204 is adjustable about a stud 208 fixed in the support |49 and the range oi' the angular adjustment of the segment member 294 is determined by a curved slot 2li? provided in the segment member and cooperating with a screw bolt 212 held in the member 549 by a lock nut. The screw bolt 2l2 and the lock nut serve to hold the segment in any position of adjustment along the slide 2|0. The purpose of this adjustment will be presently described.

When the above-described stud |90 of the pantograph mechanism is adjusted into axial Ialinement with the stud |14, the pantograph mechanism is set for the operation upon standard lasts, in which case, as explained, the movement of the toe plate |46, as a result of the movement of the support |40, needs no correction by the pantograph mechanism. Referring to Fig. i, it should be noted that if the stud |90 `were axial with the stud |14, the front face of the toe plate |45 would be located on the line S. As illustrated, the stud |90 is located above the horizontal level and to the right of the stud |14 and this position is selected on operation upon short lasts, such as the last L illustrated in Fig. l. Reversely, if a long last is to be drilled, the segment member 204 is so adjusted about its pivot stud 2da that the stud |90 is located below the horizontal level and to the left of the stud The pantograph mechanism as set in the positions for standard lasts and extreme long and short lasts is diagrammatically illustrated iny Fig. 9 of the drawings. The extent of adjustment ci the segment member 204 necessary for any particular series of lasts outside of the standard series may be determined in accordance with a scale (not shown) which, for example, may be provided on the slide |44 to cooperate with an index member (not shown) on the upper end |42 of the support |40. The scale is readily obtained by rst locating the pantograph mechanism in the standard position of adjustment, marking this position on the scale as zero, then determining the extreme positions of adjustment of the vstud |94 or the toe plate |40 respectively for a short and a long last of the same size, preferably of the sample size number 4, as illustrated, and marking this position on the scale. The remaining in-between positions are similarly obtained.- .Tc repeat, whenthe illustrated machine 1.4 is to be used for operation-upon a ystandard last the stud |90 is moved into alinement with the stud |14. If a short last is to be drilled, the stud 90 is-elevated above the stud |14 into its proper position as determined by the just-described scale, and if a long last is to be drilled, the stud |90 is lowered below the level of the stud |14 to a predetermined position, as selected, with the aid of the just-mentioned scale.

After the pantograph mechanism has been properly adjusted for the particular last style to be operated upon, any movement of the slides H4 and H6 by rotation of the hand wheel |55 to make an adjustment for size changes causes the last support P and the toe gage mechanism T to move at a ration of 3:10, as described, and, furthermore, causes a correction of the movement of the toe plate |46 if a last of a style different from standard is to be drilled.

As explained and as may be seen in the diagrammatic illustration of Fig. 9, if the pantograph mechanism is in the standard last setting with the toe plate |46 positioned on the line S (indicated by dash lines) and a grading movement of the pantograph mechanism is initiated, no dilerential motion is imparted to the toe plate M6 because in the standard setting no corrections are required. If the pantograph mechanism is adjusted for a long last (indicated by dotted lines), the toe plate |45 is retracted (that is, moved away from the axis of the drill) from the line S to the position marked f. The position f is the extreme long last position of the toe plate |46 for the sample model, for example, size number 4, as in the ilustrated case. In grading to the next lower size of this extreme series of long lasts, the toe plate |40 is advanced slightly, that is, moved toward the axis of the drill, from the vposition f to the position f. lIn grading to the next larger size in this long last setting, the toe plate is retracted from the position f to the position f. If the pantograph mechanism has been adjusted from standard position for operation upon a short last of sample size and of the most extreme series (as indicated by full lines),

.the toe plate has been advanced from the position S to the position e. In grading to the next larger size, the toe plate is advanced slightly from position e to position e. In grading to the next smaller size, the toe plate is retracted from the position e to the position e".

When making these adjustments of the pantograph mechanism, it is necessary that an additional adjustment be made when grading to larger or smaller sizes of the same series, this in view of the fact that the pitch angles of the pinion |18 and gear |02 are unsuitable to meet all situations. 'Io mitigate this condition, the above-described adjustment of the pivot screw |98 and the slide 200 carrying it, with relation to the segment 204 and the nxed stud 2de about which the segment itself is adjustable, has been provided. This adjustment and the manner in which the extent of the adjustment was determined is also diagrammatically illustrated in Fig, 9. In making this adjustment, it is necessary to l lock the slide i4 against movement and more .arbitrarily and the distances of the other bore fholes 2|4 from' it are obtained geometrically by adding to or deducting from the distance between bore hole 2I4 for last number 4 and the line of bite between the gear |82 and the rack I84 3% of that distance. Each bore hole may be brought into alinement w-ith a bore hole 2I6 provided in the table |66 and a dowel pin 2 I8 may be passed through alined bore holes to lock the slide in its predetermined position. The adjustment of the slide 266 with relation to the segment 264 is also determined by means of a geometric scale of different last sizes provided on the segment 264. An index mark provided on the slide 266 cooperates with the scale. Again in the development of this scale the sample last number 4 graduation was selected at random and the other graduations developed geometrically as based upon the dis tance between the graduation number 4 and the axis of the stud 268 about which the segment member 262 is adjustable.

The illustrated machine is provided with a holddown mechanism which serves to support the last mounted on the last support P against the thrust o1 the drill 22 during the drilling operation. Referring to Figs. 6, 7 and 8, it will be noted that there is provided a holddown 226 which is part of a two-armed lever 222 pivotally movable about a fulcrum stud 224. The stud 224 is a floating stud and is carried by the forward end of a two-armed lever 226 which is pivoted on a screw stud 228 secured in a split sleeve 236 clamped about the column I2 by bolts 232. In its inoperative position the holddown member is held elevated by means to be described. To elevate the stud 224 a spring 234 is provided which connects a projection 236 provided on the sleeve 236 with a pin secured in a socket 238 provided on the lever 222. The spring 234, in pulling up on the lever 222, elevates the fulcrum stud 224 by rocking the lever 226 about its pivot screw 228 until the rear end of the lever 226 strikes a projection 246 provided on the sleeve 236.

To move the holddown 226 into contact with the heel seat portion of the last L supported in the machine, there is provided a rod 242 which is pivotally secured by a stud 244 to the arm of the lever 222 on which the holddown 226 is provided. Upon downward movement of the rod 242, the lever 222 is rotated in a counterclockwise direction, as viewed in Fig. 7, about the stud 224. At the same time, the lever 226 is rotated in a counterclockwise direction and its rear arm is moved out of contact with the abutment 240. To move the rod 242 downward, it is provided at its lower end with a fork 246 which is pivotally connected by a stud 248 to a lever 256 pivotally movable at one end about a stud 252. The other end of the lever 256 is pivotally connected to a treadle rod 254 which at its lower end is pivotally connected to the above-described treadle 42. A spring 256 connecting the treadle 42 with a bracket 258 secured to the column I2 serves to elevate the treadle into its normal inoperative position, thereby elevating the holddown` To lock the holddown 226 in last contacting position, a pawl 260 is provided which is movable about a xed stud 262 and which is arranged .to be moved beneath the right-hand arm of the lever 222 (as viewed in Figs. 6 and 7 after the holddown 226 has been moved into contact with the last. For the purpose of controlling the movement of the pawl 266 it is provided with a substantially horizontal arm which is secured by means of a screw 264 to one arm of a two-armed lever 266 which is also pivoted on the fixed .stud 262. A'Ihe pawl 260 is adjustable with relation to the lever 266 andy to this end the horizontal arm of the pawl is provided with a vertically extending slot 268 receiving the screw 264. The screw 264 when tightened secures the pawl to the lever 266 in the selected position of adjustment. The right-hand arm of the lever 266 is connected by a spring 216- with the above-mentioned abutment 246 on the sleeve 236. The spring 216 tends, after the holddown has been moved into contact with a last mounted on the last support P, to swing the lever 266 in a counterclockwise direction, as viewed in Fig. 7, to move the pawl 266 beneath the right-hand arm of the lever 222 and to prevent clockwise rotation of the lever 222 as a result of which the holddown would be raised from the last. In the inoperative position of the parts, the left-hand extremity of the lever 266, which is forkshaped and rests on the flat top face of the fork-shaped end 246 of the rod 242, is prevented from moving down so as to swing the pawl 266 intov locking position because the rod 242 and the fork-shaped end 246 are in their elevated positions. However, after downward movement of the rod 242 and counterclockwise movement of the lever 222 to move the holddown 226 into contact with the last, both the lever 266 and the pawl 266 are now free to be rotated in a counterclockwise direction about the stud 262 by the spring 216, thus locking the lever 222 and the holddown 226 in operative positions.

The above-described mechanism for moving the holddown 226 into last-engaging position and for holding it in that position is connected with mechanism for elevating the rotary drill 22 so as to feed it into the work. It should be noted that theA above-mentioned pivot stud 252 is only stationary so long as the lever 222 is rotated in a counterclockwise direction to move the holddown into last engagement. After the holddown is in engagement with the last and the lever 222 has been locked by the pawl 266 so that it can rotate neither in one direction nor the other, the rod 242 no longer can be moved downward and consequently the pivot stud 248 now becomes a fixed fulcrum about which the lever 250 is rocked in a counterclockwise direction upon continued movement of the treadle rod 254. The result is an elevation of the pivot stud 252. The latter is connected by a rod 212 which is adjustable in length to an arm 214 which is secured on a rock shaft 216. The shaft 216 is mounted in suitable bearings in the bracket I4 and carries a gear segment 218 which meshes with a pinion 286 (Fig. 8) secured on a countershaft 282 rotatable in bearings in the bracket I4. The pinion 286 meshes with .a rack 284 provided on the portion 28 of the shaft 26. Consequently, on elevation of the pivot stud 252 after the holddown 226 has been moved into last engagement and locked, the arm 214, as a result of the continued downward movement of the treadle rod 254, is rotated to elevate, through the agency of the gear segment 218, pinion 266 and rack 284, the drill shaft 26. The .advantage of this mechanism is that both the .locking of `the vlast L against the thrust of the drill 22 and the feeding of the drill are effected by one continuous treadle operation and `that the drill cannot be fed into the last until after the last has been engaged by the holddown and the holddown has been locked in last-engaging position.

In the operation ofthe machine a last L to be drilled is mounted on the last support P after the latter has been adjusted by means of the hand wheels., "I4 and |60 insuch a position that the thimble hole to be drilled will be spaced equal distances from the two lateral edges of the top face of the heel end H of the last and that, moreover, the axis of the drill 22 will be at right angles to the said top face of the heel end I-I of the last. The last then is rmly secured to the support by means of the hook |34 which is caused to engage the last hardware by the operation of the handle |28. Assuming the toe plate |46 to be backed oir a sufficient distance to permit the mounting of the last L on the support P, the toe plate is now advanced toward the toe end of the last by the rotation of the hand wheel I 56. When the toe plate |46 engages the toe end of the last the heel end H of the last, as vpreviously described, is properly positioned over the drill 22 for the last drilling operation. Thereafter, the treadle 42 is depressed with the result that the holddown 22E) is brought down into engagement with the heel seat portion of the supported last and is locked in last-engaging position as described.

By the continued depression of the treadle the drill 22, which is continuously rotated, is elevated to engage the top face of the heel end H oi the last and is fed into it so as to bore a thimble hole into the last. This having been accomplished, the treadle i2 is released and is pulled up by the spring 256 with the result that the drill is lowered. After the drill has been lowered into its inoperative position, continued upward movement of the treadle 42 causes the positive unlocking of the lever 222 by the engagement of the upwardly moving fork 246 with the latch controlling lever 266. Finally, the holddown 220 is swung upward and its floating fulcrum stud 224 is elevated by the spring 234 until the arm of the lever 226 again engages the abutment 240. The drilled last is released by swinging the hand lever |28 reversely and may now be taken out of the machine.

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

1. A machine for drilling the heel ends of jointed lasts at a predetermined distance from the last joint, which distance is geometrically related in all lasts regardless of last sizes, having, in combination, last drilling means, a movable last support cooperatively engageable with a positioning face provided at the joint of each last operated on, a clamp for holding said positioning face against the last support so as to be movable therewith to adjust the position of said last With respect to said means, a slide for carrying said clamp and last support, a toe gage correlatively movable in the same direction with said support and clamp, another slide for carrying said gage, and operative connections between said slides for differentially moving both slides at a Xed predetermined ratio until the gage abuts against the toe end of said last.

2. A machine for drilling the heel ends of jointed lasts having, in combination, drilling means, a movable last support cooperatively engageable with a positioning face provided at the joint of each last operated on to locate the positioning faces of the lasts, irrespective of size and style, at geometrically related distances from said drilling means, a last engaging toe abutment movable in the same direction as and ata differential rate of speed from that of said support,` and activating means operatively connected respectively to said last support and toe abutment for imparting the respective movements thereto,

18 said means including a pantograph for "further modifying the differential movement of the toe abutment to take care of length variations of lasts of different styles so as to cause the toe abutment properly to engage the toe end of each last irrespective of style.

3. In a machine for operating onv various series of lasts of different styles and sizes including a standard last series in which each last has a positioning face dividing a length characteristic of that last at a 7:3 ratio which is constant for all sizes of the same standard last series, a drill, a last support movable lengthwise of the last, means for clamping said positioning face against the last support so as tofbe movable therewith, a member also movable lengthwise of the last and arranged to engage the toe end of the last, and common adjusting means including differential mechanism connected to the last support and to the toe-engaging member for moving the last support and the toe engaging member in the same direction at distances respectively varying at a 10:3 ratio with the result that, when the toe engaging member contacts the last, the heel end of the last is properly positioned with relation to the drill.

4. In a machine for operating on various series of lasts of different styles and sizes including a standard last series in which each last has a positioning face dividing a length characteristic of that last at a 7:3 ratio which is constant for all sizes of the same standard last series, a drill, a last support engaging said positioning face and movable therewith transversely of the drill in a path lengthwise of the last, a member arranged to engage the toe end of the last, a support for said member also movable lengthwise of thelast, means including dilerential mechanism connected to the last support and to the support for said member for moving the last support and the support for said member distances respectively varying at a 10:3 ratio, and pantograph mechanisrn for imparting a movement to the toe en.- gaging member with relation to its support to accommodate styles of lasts the fore parts of which diier in length from the fore parts of standard lasts of corresponding sizes.

5. In a machine for drilling the heel ends of jointed lasts of different sizes and styles at points spaced geometrically related distances from positioning faces with which the lasts are provided at their joints, a drill, a last support engaging the positioning face of a last to be drilled, a gaging member engaging the toe end of the last, a support for said member, means for moving the last support and the support for said member at different rates of speed, pantograph mechanism for imparting a movement to the gaging memberv with relation to its support to take care of length variations of lasts of different styles, and means under the control of said support moving means to operate the pantograph mechanism.

6. In a machine for drilling the heel ends of various series of jointed lastsv of different sizes and styles so that the axis of the drill hole ofeach last is spaced from a positioning face provided at the last joint a distance which is geometrically related to the corresponding distance of any last of any of the series, a drill, a last support engaging the positioning face of a last to be drilled, a gaging member engaging the toe end of the last, a support for said member, adjusting means for moving the last support and the support for said member in the same direction but at different rates of speed, and pantograph mechg55-Live anism -for accelerating said member inthe same Vdirection when adjusting said supports for drilling a larger size last inthe long last setting of s aid pantograph mechanism and a smaller size last in the short last setting and for retarding said member when adjusting the machine for drilling a smaller size last in the long last setting and a larger size last in the short last setting.

'7. A -machine for drilling the heel ends of lasts having, in combination, a frame, a drill, a movable last support, a slide on which the last sup- -port is movably secured to the frame, a -movable last toe engaging member, a support for said member, another slide on which the support for said member is movably secured to the frame, a Ipantograph mechanism mounted upon the support for said member and operatively attached to the member for moving it relative to its support, means connecting both slides and actuating them at different rates of speed, and means supported on the slide of the last support to actuate the pantograph mechanism as a result of the actuation of said slides.

8. A machine for drilling the heel ends of lasts having, in combination, a frame, a drill, a movable last support, a slide on which the last support is movably secured to the frame, a movable last toe engaging member, a support for said member, another slide on which the support for said member is movably secured to the frame, a pantograph mechanism mounted upon the support for said member and operatively attached to the member for moving it relative to its support, means connecting both slides and actuating them at diierent rates of speed, means supported on the slide of the last support to actuate the pantograph mechanism during the actuation of said slides, and means for adjusting the pantograph mechanism.

9. A machine for drilling the heel ends of lasts having, in combination, a frame, a drill, a movable last support, a slide on which the last lsupport is movably secured to the frame, a movable last toe engaging member, a support for Said member, another slide on which the support for said member is movably secured to the frame, a pantograph mechanism mounted upon the support for said member and operatively attached to the member for moving it relative to its support, means connecting both slides and actuating them at different rates of speed, means supported on the slide of the last support to actuate the pantograph mechanism during the actuation of said slides, means for adjusting the pantograph mechanism t accommodate lasts of different styles, and additional means for adjusting the pantograph mechanism to accommodate lasts of different sizes.

10. A machine for drilling jointed lasts having, in combination, a frame, a drill, a movable last support, a movable last toe engaging member, a slide for carrying the last support, another slide for carrying said toe member, a table, angularly adjustable with respect to the frame, in which said slides are movable with relation thereto and with relation to each other, operator-controlled means for moving said slides simultaneously to move the last in the direction of its turning center and to position the heel end of the last accurately over the drill, means for adjusting the table in an arcuate path about the center of the joint of the supported last, means for Vadjusting the table in an arcuate path about the turning center of the supported last, and means for ad- 20 vjusting the table in a rectilinear path transversely to the turning center of the supported last.

11. A machine for drilling jointed lasts having, in combination, a frame, a drill, a movable last support, a movable last 4toe engaging member, a support for said member, a slide carrying the last support, another slide carrying the sppport for said toe engaging member, a table, angularly adjustable with respect to the frame, in which the two slides are received for movement with relation thereto and with relation to each other, operating means connecting both slides and actuating them so as to move the last in the direction of its turning center and to Vposition the heel end of the last accurately over the drill, pantograph mechanism mounted upon the support for said toe engaging member and actuated by the slide carrying the last support, an operating connection between the pantograph and toe-engaging member to cause a movement of said member with relation to its support to accommodate different last styles, means for adjusting the table in an arcuate path about the center of the joint of the supported last, means for adjusting the table in an arcuate path about the turning center of the Supported last, and means for adjusting the table in a rectilinear path transversely to the turning center of the supported last.

12. A machine for drilling jointed lasts having, in combination, a frame, a drill, a movable last support, a movable last toe engaging member, a support for said member, a slide carrying the last support, another slide carrying the support for said toe engaging member, a table, angularly adjustable with respect to the frame, in which the two slides are received for movement with relation thereto and with relation to each other, operating means connecting both slides and actuating them so as to move the last in the direction of its turning center and to position the heel end of the last accurately over the drill, pantograph mechanism mounted upon the support for said toe engaging member and actuated by the slide carrying the last support, an operating connection between the pantograph and toe-engaging member to cause a movement of said member with relation to its support to accommodate different last styles, means for adjusting the table in an arcuate path about the center of the joint of the supported last, means for adjusting the table in an arcuate path about the turning center of the supported last, means for adjusting the table in a rectilinear path .transversely to the turning center of .the supported last, and means for adjusting the pantograph mechanism to accommodate different last styles and sizes prior to the actuation of the slides.

13. In a machine for operating on various series of lasts of different styles and sizes including a standard last series in which each last has a positioning facedividing a length characteristic of that last at a 7:3 ratio which is constant for all sizes of the same standard last series, a drill, a last support movable lengthwise of the last, means for clamping said positioning face against the last support so as to be moved therewith, a member also movable lengthwise of the last and arranged to engage the toe end of the last, and means, including differential mechanism connected to the last supDOrt and to the toe-engaging member for simultaneously moving both the last support and the toe engaging Vmember` distances in a like direction at a 10:3 Yratio until the toeengaging member abuts against the toe end of the last while Athe positioning face is located a predetermined distance lengthwise of the last from the drill.

LAURENCE E. TOPHAM.

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

UNITED STATES PATENTS Number Name Date Rebhun Feb. 7, 1893 Long July 9, 1912 Number

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