US2735460A

US2735460A - Toe finishing machine for lasts

Info

Publication number: US2735460A
Authority: US
Publication date: 1956-02-21
Anticipated expiration: 1973-02-21

Description

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Feb. 21, 1956 H, G. CLAUSING 2,735,460

TOE FINISHING MACHINE FOR LASTS Filed Nov. 18, 1954 INVENTOR. l/enry 6. Clausz'rz TQE FINISHING MACHINE FOR LASTS Henry G. Clausing, Portsmouth, Ohio, assignor to Vulcan Corporation, Portsmouth, Ohio, a corporation of Ghio Application November 18, 1954, Serial No. 469,593

4 Claims. (Cl. 144-134) The present invention relates to a device for finishing the toe sole portions of shoe lasts after the last turning operation, whereby the toe finishing of lasts may be accomplished efliciently and accurately and without the use of the usual work holders or clamps which require time to set and release them.

An object of the invention is to provide a machine which will increase the production of finished shoe lasts by reason of two cooperating last guide means against which the lasts may be manipulated relative to a cutter to remove lathe dog stubs from the toe sole portions of the lasts, and at the same time obtain a precision finish for said toe sole portions.

Another object of the invention is to provide an extremely simple machine that may be readily adjusted to accommodate it for operation on all sizes and styles of shoe lasts, said machine utilizing a single set of cutter blades for the purpose.

The operation of the machine will be made clear by the description of its use in making shoe lasts. Wood blocks from which these lasts are made will be turned in a suitable lathe to a finished contour with the exception of that portion of the toe sole which will contain the toe dog stub and that portion of the heel back that will have the heel dog stub thereon. For the purpose of this specification it will be assumed that the last will have been formed to the approximate contour described hereinbefore and that a finishing operation is to be performed on the toe sole portion of the last.

Referring now to the accompanying drawing:

Fig. 1 is a fragmental, top plan view of my finishing machine.

Fig. 2 is a fragmental, front elevational view of the machine illustrated in Fig. 1, some parts being shown in section, and

Fig. 3 is a section taken on line 3-3 of Fig. 2.

Referring to the drawings in detail, 5 designates a table that supports all the instrumentalities of the machine, said table having suitable legs 6-6. An electric motor 7 is supported above the table at a convenient height upon a standard 8 secured by bolts 9 to the underside of the motor housing and by bolts 10 to the table 5. The motor shaft 11 has a rotary cutter head 12 fixed concentrically thereto by a nut 13 in the usual manner. The head carries a plurality of cutter blades 14 detachably secured thereto by any suitable means, the cutting edges of the blades being concave in plan and each blade set at a raking angle with respect to the axis of the cutter head. The details of the cutter head are known in the art and are not therefore specifically set forth herein, it being only important to this invention that the blades be set at a raking angle in the head and their cutting edges have a circular concave formation in plan.

Two adjustable guides generally referred to herein as a last toe guide 15 and a last heel guide 16 cooperate to locate the last 17 in position with respect to the revolving blades 14 of the cutter to finish the toe sole portion of said last. The last toe guide 15 is mounted in nited States Patent close proximity to an end of the cutter head and comprises a plate 18 supported for both vertical and horizontal adjustment upon the table by means of a standard 19. This standard has a base 20 fixed by bolts 21 to the table, said base having a vertical dovetail key way 22 therein for slidably receiving a dovetail shaped arm 23 depending from and integral with a horizontal platform 24. The arm has a vertical slot 25 formed therethrough for receiving a set screw 26 threaded in a tapped bore 27 in the base. The platform has a lateral key way 28 formed therein which receives a key 29 formed in a block 30, said block having a horizontal hole 31 formed therethrough at right angles to the key 29 for slidably receiving a shaft 32 whose threaded end passes through a hole 33 formed through the plate 18 and cooperates with a nut 34 for securing the plate against a shoulder 35 formed on the shaft. As best shown in Fig. 3 the plate has a clearance opening 36 therethrough for receiving the nut 13 and shaft 11 of the cutter head, the forward toe engaging end 37 of the plate being circular and having a slightly larger radius than the cutting edges of the cutter blades 14. The shaft is adjusted on the block by a set screw 38 threaded in the block and bearing at its inner end against said shaft. The block is secured in adjusted positions on the platform by a set screw 39 threaded in the underside of the platform and bearing at its inner end against the key 29 of the block.

The last heel guide 16 is shown as having a base plate 40 provided with a longitudinal slot 41 for receiving a set screw 42 threaded in the table 5. A vertical post 43 is fixed at its lower end 44 to the base plate 40 and slidably receives a last heel engaging block 45, the upper end of said post passing through a vertical hole 46 formed in said block. A set screw 47 threaded in the block and bearing against the post holds the block in adjusted positions on the post. A pair of vertically spaced apart pins 48--48 are anchored in the block and project therefrom in divergent directions from each other to provide a saddle means for the last in which it may be held for rotation around a longitudinal axis. As indi cated in Fig. l the heel dog stub 49 of last 17 to be operated upon by the machine is inserted between the pins, it being understood that these stubs have the same thickness throughout all styles and sizes of lasts. The short distance between the bases of the pins 48--48 is made equal to the thickness of these lathe dog stubs of the last heel part to the end that the stub will be snugly received by the pins when the last is manually inserted in the machine in the manner indicated by dotted lines in Fig. 1. As the lathe dog stub is narrower than the heel portion of the last the pins act as a rear limit stop for the last so that upon inward movement of the toe portion of the last from the said dotted line position the lathe dog stub 50 on the sole of the last toe portion will be engaged by the revolving cutter blades 14 and be turned therefrom.

The cutter blades will turn away the stub 50 to a depth determined by the setting of the plate 18, it being noted that the concave formation of the cutter edges of the blades determines the longitudinal curvature of the sole toe portion of the last. The lateral curvature of the toe portions for all sizes and styles of shoe lasts is formed on the machine with one set of cutter blades by manually rotating these lasts around their longitudinal axes with the toes of the lasts held against the plate 18 and the heels thereof engaged between the pins. 4848; the divergent positions of the pins permitting such rotation to an extent determined by the amount of divergence between the outer ends of the pins.

With reference to Fig. 1 it is to be noted that the concave shapes of the cutting edges for the blades 14 produce the longitudinal curvature of the toe sole portion for the last 17. This sole also has a lateral curvature which is formed in the last by the combined functions of the two

last guides

15 and 16. As has been said the saddle means 4848 on the heel guide 16 provides a rocking movement for the last arounda longitudinal axis determined by the heel part stub positioned in the saddle, whilst the circular edge 37 on the guide 15 permits the toe portion of the last to rock thereon with respect to the revolving blades 14 to control the depth of cut so that it is flush with the finished portion of the toe sole surface. As the sole line between the upper toe surface and the toe sole surface is finished in the previous last turning step the last is revolved in the sad dle just far enough in either direction to bring the surface forrned by the cutter flush with the finished surface on the toe sole portion.

Adjustment 42 for the base plate 41) of the last heel guide 16 provides a means for accommodating the machine for operation on all styles and sizes of lasts Whilst adjustment 47 between the block 45 and post 43 of the guide provides settings for left and right lasts. Fine adjustment of depth of cut for various styles and sizes of lasts is obtained for the plate 18 by the vertical and horizontal slides provided in the standard 19.

What is claimed is:

1. In a machine for finishing the toe sole portions of shoe lasts, a rotary cutter, a series of longitudinally extending blades mounted on the cutter in oblique planes with respect to the cutter axis, each of said blades having a concave cutting edge to provide for the longitudinal curvature ofthe last toe sole portion, a last toe guide plate mounted in close proximity to one end of the rotary cutter and disposed in a plane normal to the cutter axis, said plate having a circular edge substantially concentric with the cutter for rolling engagement with a laterally extending intermediate portion of the last toe sole surface, and an outwardly divergent saddle means mounted at a distance from the guide plate for receiving the last dog stub of the heel part to secure rocking movement of the last around its longitudinal axis.

2. In a machine for finishing the toe sole portions of shoe lasts, a rotary cutter, a series of longitudinally extending blades mounted on the cutter in oblique planes with respect to the cutter axis, each of said blades having a concave cutting edge to provide for the longitudinal curvature of the last toe sole portion, a guide plate mounted in close proximity to one end of the rotary cutter and disposed in a plane normal to the cutter axis, said plate having a circular edge substantially concentric with the cutter for rolling engagement with a laterally extending intermediate portion of the last toe sole surface, a last heel guide mounted in a longitudinally spaced apart position with respect to the cutter and having a pair of fixed pins for receiving the heel dog stub of the last, said pins diverging outwardly from each other to form a saddle means permitting rocking movement of the last around a longitudinal axis.

3. In a machine for finishing the toe sole portions of shoe lasts, a base, a rotary cutter mounted upon the base for rotation around a horizontal axis, longitudinally extending blades mounted on the cutter in oblique planes with respect to the cutter axis, each of said blades having a concave cutting edge to provide for longitudinal curvature of the toe sole portion of the last, a last toe guide plate mounted upon the base in close proximity to one end of the rotary cutter and positioned thereon in a plane normal to the cutter axis, said plate having a circular last engaging edge substantially concentric with the cutter, a last heel guide block mounted upon the base in a longitudinally spaced apart position with respect to the cutter and substantially on the same level therewith, a pair of fixed pins anchored in the block for receiving the heel dog stub of the last, said pins diverging outwardly from the block to form a saddle means permitting rocking movement of the last around a longitudinal axis and providing rolling engagement of a laterally extending intermediate portion of the last toe portion with the circular edge of the guide plate.

4. In a machine for finishing the toe sole portions of shoe lasts, a base, a rotary cutter mounted upon the base for rotation around a horizontal axis, longitudinally extending blades mounted on the cutter in oblique planes with respect to the cutter axis, each of said blades having a concave cutting edge to provide for longitudinal curvature of the toe sole portion of the last, a last toe guide plate mounted upon the base in close proximity to one end of the rotary cutter and positioned thereon in a plane normal to the cutter axis, said plate having a circular last engaging edge substantially concentric with the cutter, means for mounting the guide plate on the base for planar adjustment thereon, a last heel guide block mounted for vertical and lateral adjustment upon the base in a longitudinally spaced apart position with respect to the cutter and substantially on the same level therewith, a pair of fixed pins anchored in the block for receiving the heel dog stub of the last, said pins diverging outwardly from the block to form a saddle means permitting rocking movement of the last around a longitudinal axis and providing rolling engagement of a laterally extending intermediate portion of the last toe portion with the circular edge of the guide plate.

References Cited in the file of this patent UNITED STATES PATENTS 1,269,273 Foster June 11, 1918 1,402,533 Olson Jan. 3, 1922 FOREIGN PATENTS 15,699 Great Britain July 8, 1913 736,596 France Sept. 20, 1932 966,723 France Mar. 8, 1950