US506573A - Machine for cutting leather-board - Google Patents

Description

(No Model.) 2- Sheets-Sheet 1.

J. M. WATSON.

, MAGHINE FOR CUTTING LEATHER'BOARD. No. 506,573. Patented Oct. 10, 1893.,

(.No Model.) 2 SheetsSheet 2.

T J. M. WATSON. MACHINE T011 CUTTING LEATHER BOARD.

No. 50 ,573. PatenteiOc/ig 10, 1893 U/IZfi/wsw: 7. Inn/0712541 UNITED STATES PATENT OFFICE.

JEREMIAH M. WATSON, OF BOSTON, MASSACHUSETTS.

MACHINE FOR CUTTING LEATHER-BOARDL SPECIFICATION forming part of Letters Patent No. 506,573, dated October 10, 1893.

Application filed January 23, 1891. Serial No. 378,766. (No model.)

To all whom it may concern:

Be it known that I, JEREMIAH M. WATSON, of Boston, county of Suffolk, State of Massachusetts, have invented an Improvement in Machines for Cutting Leather-Board and the Like, of which the following description, in connection with the accompanying drawings, is a specification,like letters on the drawings representing like parts.

This invention relates to machines for cutting sheets of leather board and the like into strips, and for chamfering the longitudinal edges of said strips, the object of the invention being to provide a machine,in which the leather board, whatever be its variable thickness, shall be automatically presented to the cutting knife always in the same, position relative thereto, whereby the strips out are necessarily of uniform width. To obtain such a result in accordance with this invention I provide two centering devices which act upon the sheet of board or stock upon opposite sides to hold the same in proper adjusted position with relation to the knife. These centering devices are preferably in the form of presser feet used in connection with suitable feed rolls, which feed the stock between the resser-feet to the knife, suitable means being provided whereby the presser-feet, when moved to accommodate thicker or thinner sheets, are moved simultaneously in opposite directions, in order that the horizontal central line of the board or stock, whatever be relation to the shaft carrying the feed-rolls,

and yet present a cutting edge parallel to said shaft, although it may be arranged at a slight angle to insure a draw-cut if desired. The knife is also slightly turned on its axis to present a cutting edge standing at an angle with relation to the axis of rotation of said shafts to thereby cross diagonally the path of movement of the stock, and sever the same upon a diagonal line to thereby produce strips both longitudinal edges of which are chamfered, but at opposite sides.

Figure 1 shows in side elevation a machine for stripping and chamfering leather board and the like embodying this invention. Fig. 2, shows in front elevation the machine shown in Fig. 1, the table being removed; Fig. 3, a top view of a portion of the knife; Fig. 4, a sectional detail of the knife and its support; Figs. 5 and 6, sectional details of the adjustable bearings for the shafts; Fig. 7, a detail showing the strips as out and chamfered.

In the machine herein shown to illustrate this invention the centering devices consti tute presser feet used in connection with feed rolls. The main drive shaft at, having on it suitable driving pulleys, carries a pinion a, which in turn drives a toothed drive wheel a fixed to a shaft 0. A pinion a is secured to the shaft a which engages with a toothed wheel a secured to a shaft a arranged parallel to the shaft a By this driving mechanism the shafts a a will be rotated in opposite directions. The shaft a has fixed to it two feedrolls b, b, looateda short distance apart, and the shaft 0. has fixed to it two feed-rolls b b also located a short distance apart, and which are made to co-operate with the feed-rolls b, b, to feed the stock forward. The shafts a a, have their bearings at their ends adjacent the V pinions in bearing blocks n, n, each having a cylindrical stud 91. see Fig. 6 seated in the frame-work, said bearings being held in place by nuts 72 These bearings can therefore turn, the studs n serving as pivots. The shafts a a have their bearings, at or near their forward ends, in boxes of, a which are bolted to blocks a", see Fig. 5, adapted to fit and slide in guide-ways 0. in the framework A. The boxes a a are supported in a yielding manner, each by similar mechanism,

so that only one will be described. A lug 0,

see Fig. 2, projecting from the frame-work,

has a hole through it, into which'a screw 0' is at its opposite end suitable check nuts- 0 A spring 0 surrounds the rod 0 one end of which bears against the end of the screw 0, and the other end against the box, the tendency of which spring is to distend and press one box in a direction toward the opposite box. The yielding springs for the boxes act to press the feed-rolls b, b and b b together, permitting them to yield however for any variation in the thickness of stock. Two presser-feet d, d which constitute the centering devices are supported vertically in the framework, one above the other, and adapted to hear I on opposite sides of the stock, which is fed forward between them. The presser-footd has a pin 2, to which a spring 3 is secured, the opposite end of said springbeing' attached to a fixed. point, as to the stud 4 on the frame. This spring 3 normally acts to keep the presser-foot d in its elevated position, in which position its shank bears against an adjusting screw e which passes down through a cross-bar e pivoted at 6 the opposite end of said cross-bar 6' bearing upon a strong spring 6 which is seated in a cup, not shown, contained in a socket in a stationary lug 6 said cup being supported by an adjusting screw e An arm f is formed integral with or secured to the cross-bar 6', said arm f being bifurcated at its outer end to engage a stud f on the upper end of an arm f which is secured to and'formed integral with the cross-bar f pivoted at f. The cross bar a and its arm f, and the cross bar f and its arm f constitute in effect two bell-crank levers, by which name they will be hereinafter designated in the claims. The cross-bar f is like the cross-bar e and bears at one end upon a strong spring f which is seated in a cup f fitted in a socket f formed in the under side of a stationary lug f and at its opposite end bears against an adjusting screw f upon which the presser-foot cl rests by gravity. By means of the adjusting screws e, f the cross-bar e and arm f, and the crossbar f and arm f act as bell-crank levers, one moving the other. By means of this mechanism connecting the resser-feet d, d one with the other, it will be seen that whenever one is moved the other will be correspondingly moved. Curved guides 10, 12 are secured to the frame-work which assist in feeding the stock to the feed-rolls. A knife is is located just back of the presser-feet d, d and feed-rolls, said knife being formed as a fiat blade, the shank of which is held between clamps k, which are semi-circular in crosssection, as represented in Figs. 1 and 4, and adapted to fit the circular opening in the support 70 secured to the frame-work of the machine. The blade 70 has a diagonal cutting edge 10 see Fig. 3, and the support 10 is adapted to hold the blade diagonally with relation to the shafts a a, as shown by dotted lines Fig. 2, so that the cutting edge 10 will lie substantially parallel to said shafts. The circular clamp 70, 1c is held in position in its support by aset screw I0 and said clamp is turned so that the blade is inclined to diagonally cross the path of movement of the stock passing between the feed-rolls to thereby out the stock from side to side diagonally, as represented in Fig. 2. By means of the circular clamp 70, 7c, and set screw k, the blade is may be tipped more or less, as desired, and even placed in truly vertical posi tion to cut the stock at right angles. The stock thus cut is chamfered on each side, but at opposite edges, as represented in Fig. 7.

I do not desire to limit myselt to the particular construction of mechanism herein shown for connecting the centering devices or presser-feet d, d, as other mechanism may be employed, by which the same maybe moved simultaneously, or one may move the other.

I claim 1. In a machine for cutting leather board and the like into strips, the combinationwith a knife, of yielding centering devices to act upon opposite sides of the stock fed to the knife, and connecting mechanism whereby said centering devices are moved simultaneously in opposite directions to accommodate stock of varying thicknesses and hold the stock always in a central position with relation to said knife whatever he the thickness of the stock, substantially as described.

2. In a machine for cutting leather-board and the like into strips, feed-rolls, and means to rotate the same, combined with centering devices to act upon opposite sides of the stock, and means whereby said centering devices are moved simultaneously in opposite directions to accommodate stock of varying thicknesses, and the knife, substantially as described.

3. In a machine for cutting leather-board and the like, feed rolls, and means to rotate the same, combined with centering devices to act upon opposite sides of the stock, and means to provide an equal simultaneous movement of the centering devices in opposite directions toward and from the central point, v

combined with a diagonally positioned knife arranged opposite the central point between said centering devices, whereby stock of varying thicknesses is always fed to said knife in the same central or relative position, substantially as described.

4. In a machine for cutting leather-board and the like, feed rolls, combined with two centering devices which bear on opposite sides of the stock, and connecting mechanism whereby one centering device is moved by and simultaneously with the other, and a knife, substantially as described.

5. In a machine for cutting leather-board and the like, feed rolls, and means to rotate the same, combined with two centering devices to act on opposite sides of the stock and means whereby said centering devices are moved simultaneously in opposite directions, and adjusting devices to vary the separation of said centering devices one from the other, and a knife, substantially as described.

6. In a machine for cutting leather-board and the like, two centering devices to act at opposite sides upon the stock, mechanismwhere- IIO by said centering devices are moved simultaneously in opposite directions to accommodate varying thicknesses of stock, and hold the latter always in the same central position, combined with feed rolls made yielding to adapt themselves to the varying thicknesses of stock without moving the same from its central position as held by the centeringdevices, and a knife having its cutting edge arranged or presented diagonally across the path of movement of the stock, substantially as described.

7. In a machine for cutting leather-board and the like, feed rolls, and means to rotate the same, combined with two centering devices and connecting mechanism consisting of two bell-crank levers connected at one of their ends with the said centering devices, and at their opposite adjacent ends with each other whereby movement of one centering device causes like opposite movement of the other, and a'knife, substantially as described.

8. In a machine for cutting leather board and the like, the combination with four yielding feed-rolls, arranged in pairs the rolls of each pair facing each other, and means to r0- tate the same, of centering devices arranged between the two pairs of rolls and to act upon opposite sides of the stock, and means whereby said centering devices are moved simultaneously in opposite directions to accommodate stock of varying thicknesses, and a knife, substantially as described.

In testimony whereof I have signed my name to this specification in the'presence of two subscribing witnesses. I

JEREMIAH M. WATSON.

Witnesses:

' J AS. H. CHURCHILL, EDWARD F. ALLEN.

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