US442399A

US442399A - Leather-skiving machine

Info

Publication number: US442399A
Authority: US
Publication date: 1890-12-09
Anticipated expiration: 1907-12-09

Description

(No MQdel.) 2 sheets sheet l.

J. A. SAPFORD. LEATHER SKIVING MACHINE.

No. 442,899. Patented Dec. 9,1890.

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\A IT 5555: l I INVENTU m fiqi (No Model.) 2 Sheets-S11eet 2.

J. A. SAPPORD.

LEATHER SKIVING MAGHINE. No. 442,399. Patented Dec. 9, 1890.

WITNEEEEE lNVE INTElRi fi 7 UNITED STATES PATENT OEEIcE.

JOSEPH A. SAFFORD, OF BOSTON, MASSACHYSETTS.

LEATHER-SKIVING MACHINE.

SPECIFICATION forming part of Letters Patent No. 442,399, dated December 9, 1890.

Application filed June 21, 1890. Serial No. 356,231. (No model.)

To all whom it may concern:

Be it known that I, JosEPH A. SAFFORD, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Leather Skiving or Beveling Machines, of which the following a specification.

This invention has for its object to provide a simple and effective machine for skivin g or beveling leather, adapted to cut diagonally through a strip of leather of any thickness Within reasonable limits from one side to the other to produce a skived or beveled surface of any desired length,terminating in aknifeedge.

The invention consists in the improved machine including a leather splitting or skiving knife and an adjustable segmental bed co-operating therewith, which I will now proceed to describe and claim.

Of the accompai'iying drawings, forming a part of this specification, Figure 1 represents a top view of a leather beveling or skiving machine embodying my invention. Fig. 2 represents an end view of the same. Fig. 3 represents a section on line 3 3, Fig. 1. Fig. 4 represents a sectional view showing the relative position of the knife and the leather-supporting bed at the end of the skiving operation.

The same letters of reference indicate the same parts in all the figures.

The chief features of my invention are a knife (1, adapted to split or skive leather, a segmental bed Z), adapted to support the leather while it is being beveled or skived, and holders for said knife and bed, said holders being pivotally connected, so that one can oscillate relatively to the other, and means for adj usting the bed to make it more or less eccentric to the cutting-edge of the knife.

The details of construction whereby the machine having said principal parts is made operative, as hereinafter described, may be variously modified, and the invention is not limited to the details hereinafter referred to, the construction here shown and described being a good and practical way of carrying my invention into practice.

The knife is here shown as attached to a fixed support or holder comprising two vertical standards 0 c and a base 0'.

(Z represents a frame or holder, which is pivoted at e to the said standards 0 c, and is adapted to be oscillated on said pivot.

The segmental bed I) is connected at one end to the swinging end of the frame or holder (1 by a hinge or pivot p. The pivoted end of the bed and the cutting-edge of the knife are substantially equidistant from the pivot or axis e, that connects the bed-holder (l with the knife-supporting frame, so that when the bed is turned to the position which brings its pivoted end nearest to the knife the surface of the bed will be in close proximityto or will bear against the knife, as shown in Fig. l, which represents the position of the bed at the end of the out which forms the skived or beveled surface on apiece of leather supported by said bed. The bed is adapted to swing on the pivot 1), that connects it to the holder, so that its forward end or the one opposite the hinged end can be moved inwardly or outwardly to make the curved surface of the bed more or less eccentric to the knife, or, in other words, to separate the rear end or portion of the bed from the edge of the knife more or less when the bed is in the position shown in Figs. 2 and 3, so that the surface of the bed adjacent to the knife will gradually approach the knife when the bed is moving from the posit-ion shown in Figs. 2 and 3 to that shown in Fig. i, and thus cause theknife to make an elongated diagonal cut through a piece of leather supported on said bed, the bed being first adjusted when its hinged end is depressed so that the knife will bear on the outer surface of the leather, and then moved in the direction indicated by the arrow in Fig. 3 until its rear or hinged end comes in contact with the knife, as shown in Fig. 1L, the result being the cutting of the leather on a true bevel.

To adjust the bed as above described, I provide the bed-holder (Z with an adjustingscrew f, which bears on a shoulder 011 the under side of the bed, as shown in Fig. 5. A spring g, secured at one end to the bed or to a projection thereon and at the other end to the bed-holder (I, holds the bed with a yielding pressure against said adj Listingscrew. It will be seen, therefore, that by turning said screw in one direction or the other the forward end of the bed may be moved from or toward the knife, as the case may be, thus making the bed more or less eccentric to the knife.

i represents a pressure bar or roll, which is supported by the knife-supporting frame, and is arranged to bear with a yielding pressure upon the leather on the bed at a point close to the cut-tingedge of the knife and to press the leather closely against the surface of the bed. The ends of said roll or bar are inserted in sockets formed in sleeves or boxes mm, which are vertically movable on studs or guides jaffixed to theknife-supporting frame. Springs 7t: 70 on said guides press the boxes m and roll or bari downwardly on the leather on the bed. Adjustable stop-screws o are located on the knife-supporting frame in posi tion to limit the downward movement of the roll or bar 2'. v

q represents a clamp, which is adapted to secure the leather strip to the rear end of the bed during the skiving operation. Said clamp is here shown as a bar provided at its ends with ears q g, which are pivoted at r to the bed I). The clamp is provided with a flange or jaw (1 which is adapted to overlap the rear end of the bed, as shown in Fig. 3, and with a handle or lever (1 whereby the clamp may be raised from and pressed downwardly upon the bed. hen a piece of leather is secured to the bed by the clamp, the lever (1 may be utilized as the means for moving the bed in the direction required to cause the described skiving or beveling action.

The operation of the device above described is as follows: The pivoted end of the bed being depressed, as shown in Figs. 2 and 3, the operator places the piece of leather to be skived upon the bed and clamps said piece to the rear end of the bed. The bed is then adjusted to press the upper side of the piece of "leather against the knife, and then the bed is moved in the direction indicated by the arrow in Fig. 3 by pressure on the handle (1 until it reaches the position shown in Fig. 4, the knife at this point reaching the inner side of the leather after having made an elongated diagonal cut therethrough.

It will be seen that leather of any reasonable thickness can be cut by this machine, the knife passing diagonally through a strip of any thickness, so that its cutting action commences at the outer and terminates at the inner side of the strip without regard to the thickness thereof, the out being in each case a true bevel or taper, the inclination of which is governed by the thickness of the strip and by the distance from the pivoted end of the bed at which the cutting action was commenced. For example, if it is desired to make the taperlon g and gradual the bed will be moved to depress the pivoted end farther than when a shorter and more abrupt taper is desired, the bed being moved in the latter case so that a portion of its periphery nearer the pivoted end will be under the knife. Itwill be seen that the clamp, be-

ing connected directly to the bed, is not affected by any adjustment of the latter, but always maintains the same operative relation to the bed under all adjustments of the latter.

It is obvious that any other suitable clamping device to secure the leather to the rear end of the bed may be adopted without departing from the spirit of my invention.

The machine is particularly adapted for skiving the ends of belting-strips, but may be used on strips of leather for any purpose.

If desired, the pivoted end 1) of the bed may be fixed and the knife-supporting frame adapted to oscillate on the pivot e, the bed still being adjustable, as above described, to make it more or less eccentric to the knife.

1 claim 1. In aleather beveling or skiving machine, the combination of a fixed knife, a supporting-frame therefor, a holder or support pivotally connected at its inner end to the knifesupporting frame, a segmental bed pivotally connected at one end to the outer end of said holder or support, the pivoted end of the bed and the cutting-edge of the knife being practically equidistant from the pivot or axis that connects the bed holder or support to the knife-supporting frame, whereby the cutting-edge of the knife is brought close to or in contact with the surface of the bed when the pivoted end of the latter is at its closest approach to the knife, and means foradjusting the bed to make its supporting-surface more or less eccentric to the cutting-edge of the knife, and thereby enabling the knife to commence its action on the outer side of a piece of leather of any desired thickness supported by said bed and to form a taper any desired length on the said piece, as set forth.

2. In a leather beveling or skiving machine, the combination of a fixed knife, a supporting-frame therefor, a holder or support pivotally connected at its inner end to the knifesupporting frame, a segmental bed pivotally connected at one end to the outer or adjustable end of said holder or support, the pivoted end of the bed and the cutting-edge of the knife being practically equidistant from the pivot or axis of the bed holder or support, means for adjusting the bed to makeits supporting-surface more or less eccentric to the knife, and a clamp connected with the rear or adjustable end of the bed, whereby astrip of leather may be secured to said end, the connection of the clamp to the adjustable end of the bed enabling the clampto operate alike under all adjustments of the bed, as set forth.

In a leather beveling or skiving machine, the combination of a fixed knife, a fixed supporting-frame therefor, a holder or support pivotally connected at its inner end with the knife-supporting frame and adapted to be oscillated, a segmental bed pivoted at one end to the swinging end of said frame, the piv- ICC oted end of the bed and the cuttil'ig-edge of the knife being substantially equidistant from the axis on which the bed holder or su pport oscillates, an adjusting screw mounted on said bed holder or support and arranged to bear on the segmental bed, and a spring arranged to hold said bed in contact with the adjustingscrew, as set forth.

4. In a leather beveling or skiving machine, the combination of a knife, a fixed supporting-frame therefor, a holder or support pivotally connected with the knife-supporting frame and adapted to be oscillated, a segmental bed pivot-ed at one end to the swinging end of said holder, the pivoted end of the bed and the cutting-edge of the knife being substantially equidistant from the axis on JOSEPH A. SAFFORD.

Witnesses:

C. F. BROWN, A. D. HARRISON.