US1521110A - Skiving machine - Google Patents

Description

Dec. 30. 1924. v 1,521,110

- 1 H. W. KRAG SKIVING MACHINE Fiied June 29, 1923 7 I m/ iflii/gflfar:

Patented Dec. 30, 1924.

ITED STATES! HARRY w. KRAG, or sit. Louis, Misseniu, Assr'enon To emissions? snot: MACHINERY AND 'To'oL COMPANY, or "sr. nears, ivirssouiai, A CORPORATION or Mfss'ounr sit-WING IVLLACH-INE.

Application filed-June 29, 1923. Serial No. 648,418.

To all whom it may concern.-

Be it known that l, HARRY WV. KRAG, a citizen of the United States, and a resident of the city of St. Louis and State of Missouri, have invented a new and useful 11nproveinent in Skiving Machines, of which the following is a specification.

My invention relates to skiving machines and has for its principal object to devise a control mechanism for the knife of such machines that will keep a portion thereof in a fixed relation to the edge of upper roll of the skiving machine, regardless of the thickness of the material operated on thus making the cut material of uniform thickness at that point. The invention consists principally in a compensating link mechanism whereby the downward pull on the portion of the knife which it is desired to maintain in a predetermined position is off-set by an upward pressure. The invention further consists in the skiving machine and in the parts and combination of parts hereinafter described and claimed.

In the accompanying drawing,

Fig. 1 is an elevation of a skiving machine embodying my invention;

Fig. 2 is a diagrammatical view of the knife control mechanism.

The skiving machine shown in the drawing comprises a frame 1 or standard in the upper end of which is rotatably secured a shaft 2 on the end of which is a roll 3 that co-operates with a lower roll 4 that is rotatably mounted between the forked ends 5 of a rod 6 that is slidably mounted in a suitable bearing member 7 on the standard. A spring 8 is interposed between the rod 6 and a portion of the standard and tends to hold the lower roll 4 against the upper roll 3. A shaft 9 is rotatably mounted in the standard and is provided with a handle 10 or other suitable means for turning it. A gear 11 on said shaft 9 meshes with a gear 12 on the shaft 2 that carries the upper roll 3.

One end of a knife table 13 is pivotally secured to a link 14 and the link 14 is pivotally secured to one arm 5 of the forked member that supports the lower roll. A. knife 15 is secured to the knife table 13 by means of screws 16. The other end of the knife table 13 is pivotally secured as by a pin 17 to a crank arm 18 that is pivotally secured to the standard 1 as by a fulcrum pin 19. The other end of the crank 18 pivotally secured to a-l ink 20 whose end is pivotally secured to a projecting portion 21 of the fork member.

When leather or other material is fed into the machine, it forces the lower roll away from the upper roll. The fork member is thus lowered, and through the link the end of the knife table is lowered. The lowering of the forked member moves the link that is connected to the crank arm and swings said crank arm, thus raising the portion of the crank arm that is connected with the knife table. Thus the end of the knife table is raised. such that the portion of the knife with reference to the edge of the upper roll (shown at A) remains constant, the lowering action of one link being compensated for by the raising action of the other link and crank arm. Thus the thickness of the material at the point (A) after the cut is always the same regardless of the thickness of the material being operated on. The

action of the machine is diagrammatically shown in Fig. 2, and it will be readily seen that the point (A) remains constant regardless of the relative position of the ends of the knife table.

Obviously numerous changes may be made without departing from the invention and I do not wish to be limited to the precise construction shown.

That I claim is:

1. A skiving machine comprising a frame, a pair of cooperating rolls, a support for one of said rolls, said support being movable towards and away from the other roller, a knife holder having a link connection with said support, a knife carried by said knife holder, and means secured to said knife holder and to the frame of the machine for maintaining a portion of said knife in fixed relation to said fixed rOll in all positions of said movable roll and support.

2. A skiving machine comprising a frame, a roll rotatably mounted therein, a forked support mounted in said frame so as to be movable toward and away from said roll, a second roll rotatably mounted between the forks of said support to cooperate with said first roll, a knife table secured to said support, a knife secured to said table and mean for maintaining a portion of said knife in The proportions of the parts are llH) llU

fixed relation to said first roll in all positions of said movable roll.

3. A skivmg machine comprising a frame,

a roll rotatably mounted therein, a forked support mounted in said frame so as to be movable toward and away from said roll, a second r011 rotatably mounted between the forks of said support to cooperate With said first roll, a knife table secured to said support, a knife secured to said table and means for maintaining a portion of said knife in fixed relation to said first roll in all positions of said movable r011, said means comprising a link pivotally secured to one fork of said support and to the table, a crank pivotally mounted on theframe, one end of said crank being pivotally secured to said table and a second link pivotally secured to the other fork of said support and to the end of the crank.

Signed at St. Louis, Missouri, this 26th day of June, 1923.

HARRY W. KRAG.

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