US1121717A - Leather-skiving machine. - Google Patents

Description

E. F. DAVENPORT.

LEATHER SEWING MACHINE.

\ APP IOA ON FILED JULY 1",, 1909 Patented Dec. 22, 1914.

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EUGENE F. navmironr, or MELROSE, iuassaonnsn'rrs, ASSIGNOB. T UNITED snon MACHINERY a r-Means. or raennscn, NEW zrnnsny, A CORPORATION or NEW JERsEYi LEATI-IER-SKIVING 'MACHINE Specification bf Letters Patent. Patented D 22 191 4 Application filed July 17, 1909. Serial No. 508,136.

ToaZZ-w/lom it may concern Be it known that I, Er or-mi: F. DAYEN-- Pom, a citizen of the United States, residat Mclrose, in the county of illiddlesex and State of Massachusetts, have invented .machine and is intended primarily for use.

1 in machines of the type disclosed in an apchines at this plication for United States patent filed-bf. George Warren, Serial No. 1815 117, dated March 3, 1909. It is to be understood, however that while the invention particularly adapted for use iii-machines of the class disclosed in said application, the invention is also applicable to other forms of leather skiving machines. I

in the skiving machine aboi'e referredto the pieces of leather to be skived are fed to a rotary cylindrical. knife by means of a feed roll cooperating with a presser foot.

It is essential that the edge of this knife be.

maintained sharp so that the leathervmay be sliiveejl to a very thin edge. Heretoiore maeral class have been promonnted so to be capable o- A it into engagemei'it with the outer r l of the knife. This grinder leaves a bur the edge of the knife 'and it has been customary to remove this hur by means of an oil stone held in the the operator being cut the knife.

hand'of the operator. This method of relmoving the bar is ob ectionable tor the reason thatthe knife is not readilyaccessible and for the reason that there isdanger of Another objection to this method of removing the bur is that the whet stone is not always manipulated properly by the operator so that the edge of the knife is not left 1n a condition to do satisfactory Work.

The object of the present invention is to provide a sharpening and bur removingde vice which will be free from the ob ections above noted, which will be simple and compact in construction, and will perform the desired operations in a satisfactory manner. With this object 111' View the present incnd elevation.

ven'tioncontemplates the provision of: an oil ting edge of thevknife, and mechanism for moving the stone into and out of operative.

relation with the knife edge and for permanently supporting the stone with its Working face positioned in parallel relation to theint erior.surface of tlie'knife.

In theprelerredfornr of the present in-' vention,.certain novel c mstructions and arthe lie-companyin drawings.

in the drawings l i'gurel is a partial sectional s de elevation.v Fig. 2 is a partial sectional plan 'v1ew', and Fig. 3 is asectional its-shown inthe-dranungs the machine comprisesa'base l' the left hand orfront end 2 01' the top 0t which forms av \vork table I upon which an edge gage lis adjustably I mounted. A presser foot 6 18 mounted ina head 8 and adapted to cooperate with a .feed roll 10 directly below thefsame to feed The feed roll is the material to be skived. rotatahl supported by an arm 12 which projects laterally from a sleeve ll rotatably mounted onla rod 15 which" is supported'in the base of the machine. The sleevell. is surrounded by a coiled spring 16' which is attached atone end to a lug 18 on the sleeve and at the otherend to a collar 19 pinned to the rod 15. Thus the feed roll is yieldingly pressed upward against'the material to be SkliQCl. l knob 20 is connected by means of a rod 21 to a depending arm 22 on the sleeve ll, by means of which feed roll may be manually lowered to allow the operator to inor Whetstone supported adjacent to the cutsert the material between the feed roll and presser foot. The feed r ll is rotated by.

means of a rod 2 having a universal joint at each end and connecting the roll with a' shaft 21'') provided. Witha spiral gear 27 meshing with a similar gear'2S on a shaft 29 connected to any suitable source of power.

.Thefeed .roll is mounted to rotate near thee'dge and Within the pcriphe'y of a cylindrical skiving knife 30. i

' The knife 30 is secured to the flanged end 32-01? ashaft 34: journaled to rotate in a sleeve 36 mounted in a frame 37 supported by the base of the machine. The shaft 34:

- the-present is rotated anytsuitable means. 7 For sharpening the edge 38 of the knife a' rotary grinding diski is provided which is mounted upon the upper end of a: shaft 42 j'our'naled .ina b( ss 4% formed ing armed A grooved pulley 47 is mount on one endof a swing ed onthe lower end oftheshaft 42' and is driven by'a belt source of po'wer.;: Aiscrew-threaded rod 48 connected with the 50 "is pivotally connected at one end-to the arm 46 by a p n '51' and" projects through 1 the side of the base 1 to cooperate with a long Sleeved nut 52 by means of which. the 0 position of the grinding disk may be varied. If desireda spring (not shown) may be connected to t eiarni 4:6 to draw the, disk knife when the 'nut" 52 is 1111-" against the screwed. The .parts' of "the machine 'so' far describedare the same in construction and -mode of operation as the corresponding 1 cylinder.

parts of'the machine disclosed in.theapplication ,hereinbefore referred to.

The construction illustrated in the draw-' ings as embodying, the preferred for m of invention comprises an. oil or whet stone This stone projectsinto the interior of the rotary knife and is mounted in a holder or boss 61 provided with a clamping or setscrew 62 and mounted upon 'an arm 6i pivoted at 65"to a bracket 66 attached to; the side of an arm 68 secured to the frame 37 and projecting below the knife. The plane of' movement of the arm I 64. into and" out of operative position is parallel-to the-plane of the cutting edge of the knife and the stone is secured in the arm normally to this plane softhat with this construction the working face of the stone is permanently positioned in parallel relation to the"interi 0r. surface of the knife.

-' rod 69 is pivotallyfa-ttached-at one end to the" arm Stand projects'through the base 1 the outer end of the rod being provided witha knob -70. A spring 72 surrounds the rod 69and is interposed between theoutside of the base 1 and the innerend of the knob .allow the grinding disk 60. in the form of an elongated v 70. This spring ant to keep at state 60 thenut' '52. is unscrewed-to the grinding operation isremoved by the stone 60'which is brought into contact-with the interior of the knife, by pushing the knob against the tension-"of the spring 72. Upon releasing the knob the stone is automatically Withdrawn from contact with the knife. I

The invention having been described, what .is claimed is:-

1. A leather skiving machine, having, in

combination, skiving kn1fe, a grinding disk'arranged to be moved at'interva'ls into contact with the a substantially cylindrical exterior beveled surface of the knife to sharpen the cutting edge,- a Whetstone projecting within the knife, and mechanism for moving the stone into and out of operative relation'with the knife edge and for permanently supporting the stone with its working face positioned in parallel relation to the interior surfaceof the knife andexe tending substantially in the direction of the axis of the knife.

\ A leather skiving machine, having, incombination,

exterior surface of the knife to sharpen the cutting edge, an arm arranged to move in a plane parallel to the planeof the cutting edge, and a Whetstone sec'ure'd the arm and projecting within the knife normal to'the plane of the movement of the arm and; with its Working face parallel to the interior surface of the knife.

.EUGENE F. DAVENPORT. Witnesses:

\VARBEN' G. OGDEN,

ALFRED H. HILDRETH.

a cylindrical skiving knife, 9. I grinding disk arranged to contact withj-the-

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