US1252172A

US1252172A - Leather-cutting machine.

Info

Publication number: US1252172A
Application number: US16442717A
Authority: US
Inventors: Joseph C Prims
Original assignee: Individual
Current assignee: Individual
Priority date: 1917-04-25
Filing date: 1917-04-25
Publication date: 1918-01-01
Anticipated expiration: 1935-01-01

Description

J. C. PHIMS.

LEATHER CUTTING MACHINE.

APPLICATION FILED APRl 25. \911.

Patented Jan. 1

J. C. PRIMS.

LEATHER CUTTING MACHINE. APPLlcATl'oN HLED APR. 25. 1917.

1,252, Patented Jan. 1,1918.

2 SHEETS-SHEET 2.

LEATHERi-CUTTING MACHINE.

TloaZZ whom t may concern:

Be itr known that I, Josnrn C. Farms, a citizenl of the United States, residing at `orne'll, in the county of Steuben and State of New York, have invented certain new and useful Improvements in Leather-Cutting Machines, of which the following is a specification.

lThe Vresent invention relates to im rove- Vments, in leather skiving machines, designed particularly for the purpose of cutting leather belts for splicing. The present 1nlvention is an improvement on the construction of leather skiving machines and involvesr certain combinations and arrangements ofparts (whereby the skiving knife isl submerged in the leather)v before the cutting operation is initiated in order that a clear and straight edge will be made at the ends of the severed belt and eliminating the irregular edge usually resulting from the use ofthe knives no w in use. The invention also involves the utilization of an abutment ofl comparatively soft material placed in the path of the knife edge at the end of the movement of the rotating platen or car* rier.r Certain other features will also be pointed out hereinafter inv my specification and claims, whereby .a practical, facile, and efficient skiving machine. is provided for performing I the lrequired functions.

YIn the accompanying drawings I have illustrated one complete example of the physical embodiment of my invention constructed according to the bestmode I have so far devised for the practical application ofthe principles of my invention.

Figure 1 is a. front elevationl of a skiving machine embodying the novel features of my invention, the front plate of the'machine v being omitted for convenience of illustraas in Fig. 1.

Fig. 5 is a longitudinal section through the knifeeholder.

In the preferred embodiment of my 1nvention as illustrated in the drawings and y Specification of Letters Patent.

Patented J an. 1, 1918.

Application filed April 25, 1917. Serial No. 164,427.

as now actually in use, the supporting frame 1, preferably in the form of a circular disk is fashioned with the bracket arm 2 and

' lugs

8, 3, the boss l being threaded for the clamping hand screw 5 by means of which the machine may be attached to a bench or other support indicated as 6.

At its upper end the frame 'is' mortised to'receive the horizontally disposed khousing or holder 7 for the knife 8, it being understood that the knife is stationary and theleather belt or other work7 is moved to the cutting edge of the knife during the process of skiving or paring. To this end the holder is rigidly secured in the frame by the. bolt 9 passed through the perforation 10 in the holder and threaded into the frame. The holder is slotted at 11 to receive the knife blade and the cutting edge projectsfrom the holder so that it may engage theleather belt as indicated by the numeral l2. The slot 11 is of sufficient size. so that the knife blade may be movedlongitudinally of the holder, and to this end a' pair of alined iXed pins 13 and 14n are provided in the holder and the slots 15 15 in the blade move about Athese pins as the blade is shifted endwise. To shift the blade I employ a lever handle 16 fulcrumed on the fixed pin 17 and movable in the slot 18 in the rear edge ofthe holder, and the opposite end of the lever is rounded at 19 to work in the rounded recess 20 at the back edge of the knife. blade. Thus when the lever is turned on its fulcrum the blade may be shifted longitudinally in its holder.

As before stated, the knife is stationary and the belt is brought to the knife by a rotating carrier, which is revolubly supported in the long hub or bearing sleeve 21 ofthe frame 1. The sleeve is located centrally of the frame and the carrier 22 is fashioned with a central hollow, or tubular shaft 23, rotatable in the bearing sleeve or hub, and the carrier is actuated through the medium of the actuating lever 2l keyed at Q5 to the hollow shaft, and retained by the. end washer 26 secured by the bolt 2? in a bearing 28 at the outer end of the hollow shaft. A long bearing is thus provided, for the movement of the carrier and its movement is consequently steadied and rendered accurate.

"The periphery of the carrier as indicated at [282" is smoothed and finished in order to provide'a knife bearing surface, and the carrier which is fashioned as a circular disk, corresponds in outline to the circular disk of the frame 1. In operation the knife is made to cut on a tangential line into the leather belt, and this tangential cut is accomplished by theV utilization of anv eccentric lmember or platen 29. This platen 29 is a broad circular plate, of a little less diameter than the disk `of the carrier and particularly the knifebearing surface 28a, and is pivoted on the carrier by means of the hinge pin 30 which passes. through the bearing sleeve 31 of the plate. .At the end of the plate opposite the hinge, a spring 32 is attached and the Vother end of this spring is fixed to a lug or flange 33 extending the full width of the platen and projected from the carrier 22. At the central portion of the underside of the platen is a circumferentially extending Y roller. In Fig. 1 it will be noted that theV integral rib 34 provided with a finished face i 35 and terminating in stop lug 36. In frictional contact with this surface -at, all

y,times is the head 37 on `the short arm 38 of the eccentric lever 39 which is formed with a bearingV sleeve 40 that is rotatable on the relation to the true circle in order that as n the carrier or platen is turned, the vknife edge is forced through the leather on a tangential line.

lVhile being cut the leather belt is held to the carrier by means of a cam lug 42 eX- tending the full length of the sleeve 43 having a bearing on the stud or bolt 44 projecting from the carrier, and this cam lug may be turned by the cam lever 45 to clamp the belt on the plate 46. At the other side of the cutting knife the belt may beheld down on the platen as it passes under a pressure roller `47 supported in a housing 48 which is pivoted by means of the sleeve 49 on the stud or bolt 5G, a handle 51 being provided for operating the pressure roll. By means of the cam 42 the leather belt is clamped on the carrier and the clamp or cam holds the leather belt by frictional contact therewith, but the pressure roller is held down on the belt by hand, as the belt passes under the roller is located just in front of the knife edge, and it Willv be seen that a Wooden or fiber strip 52 is secured in a groove extend# ing across the platen at its hinged end and proj ects up above ythe surface of the platen.

This strip of soft material, in addition to performing the function of an abutment forthe knife edge, raises the material ofl the the roller.

' belt sotthat the knife edge will pass through the underside of -the belt leaving a clear straight edge to the cut. The carrier is provided With a front plate 53 secured by a `screw or bolt 54 to the stud 41 of the carrier shaft, and on the flange 55 of the plate,

a scale is indicated for use in cutting the belts. Thebeltis then inserted, preferably under the cam 42, andmoved under the knife and roller to position on the 'platen so that the end of the belt is resting on the abutment 52 which is fthe highest point of J the platen and the point where the `final k,cut of th'e knife is made, andthen the belt is: vclamped by the-cam 42. The carrier. is now turned tothe right in Fig. 1 toa position so that the length of the desired cut'vvi'll be the,Y distance between the knife edge and the abutment 52.

the head 37 riding under the rib 34v and lifting the hinged'platen which presses the belt firmly up against the knife edge, so'that .The handle or lever 397i is now turned to elevate the eccentric'platen, g5

the' knife edge depresses the surface of the'l belt, and when the handle 16 is moved to shift the knife longitudinally, the knife 'cuts into thek belt, making a sharp, straight and clean initial cut. n Vith the leather now held down on the platen lby the leverV 51'?l v through its'roller 47 the lever 24 is turned to the right in'Fig. 1 and the knife edge cuts through the leather from top to bottom as the belt is forced past the knife, the -result being that a tapered end is provided for the belt to be spliced and when both ends j have been cut to form a taper lap the lapped ends may be cemented or glued together as usual. VThe knife bearing surface 28a of the carrier passing under the knife edge pre-T vents the knife from'being forced down to lthe platen as' the belt passes over theknife,

and the pressure,v roller 47 holds the belt down on the platen as thebelt'passes under Y Due to the fact that the initial cut ofthe knife edgeinto the material is accomplished vbefore Vthe actual skiving operation is started, and alsoto the fact that the end of the Vbelt is lifted so that the knife edge. vwill cut clear through the Aunder'-L side of the`belt,"an improved'form ofoverlapping splice ends isprovided. When the two beveled faces ofthe belt ends are brought together and cemented or glued, the ends'or edges of the beveled overlapping pieces litsnugly into the recesses cut by the knife edge at its initial'movement, and Aa vsmooth face on both sides of the belt is presented.

In 'my former patent referred to herein,

the knife or cutter was secured to remainfiXed orl stationary under all conditions, while in the present invention the knife is Astationary with reference to the direction of the feed of thepwork, but is capable of a sliding motion in aV direction transverse to the direction of the feed of the work, which is a very great improvement and a most important difference, as this construction enables the knife to be submerged in the leather and under these conditions to be moved sidewise or transversely which gives the leather a clean shear cut.

lVhat I claim is 1. The combination with a supporting frame and a stationary knife of a. Work carrier rotatably supported in the frame and adapted to present the Work to the knife edge, and an abutment carried by the carrier and composed of comparatively soft material to engage` the knife edge at the end of the carrier movement.

2. TheI combination with a. rotatable carrier and ay fixed knife, of a platen hinged on the carrier, means for moving said platen to permit a beveled cut to be produced by the knife in the leather to be treated, and an abutment of soft material for the knife attached to the platen at its point of hinging.

3. The combination with a supporting frame and fixed knife, of a carrier adapted to support a leather belt, means for moving the belt to position to permit an elongated bevel cut to be produced therein by the knife, and means for submerging the edge of the knife in the belt prior to the cutting operation of the knife.

Ll. The combination with a supporting frame and a fixed knife, of a carrier adapted t0 support a leather belt, means for moving the belt to position to permit an elongated bevel eut to be produced therein by the knife, means for submerging the knife edge in the belt prior to the cutting operation, and means for positioning the end of the belt so that the knife edge will take a course more nearly perpendicular through the body of the belt as it emerges therefrom.

5. The combination of a fixed knife, a rotatable carrier, a movably-mounted platen, means for moving the same to permit a beveled out to be produced by the knife in the belt, and means for causing the knife edge to take a Course nearly perpendicularl'y7 through the body of the belt as it emerges therefrom.

6. In a leather cutting machine, the combination of a stationary support, a movable platen, a knife mounted above said platen fixed longitudinally with reference to said platen, and means for manually moving said knife transversely to start the knife in the leather.

7. In a leather cutting machine, the com bination of a fixed support, a rotatable carrier, a movable platen, means for moving said platen, and a knife having a fixed longitudinal relation t0 said platen and ca Jable of a transverse movement to start the knife in the leather.

In testimony whereof I affix my signature in the presence of two Witnesses.

JOSEPH C. PRIMS.

Vitnesses:

HARRY A. SMITH,

L. C. WILLEY.

Copies of this patent may be obtained for ve cents each, by addressing the "Commissioner of Patents,

' Washington, D. C.