US623423A

US623423A - Staking-machine

Info

Publication number: US623423A
Authority: US
Publication date: 1899-04-18
Anticipated expiration: 1916-04-18

Description

No. 623,423. Patented Apr. l8, I899.

H. M. PIERCE 81. W. E. PUINSETT.

STAKING MACHINE.

(Application filed Apr. 21, 1898.) (No Model.) 2 Sheets8heet l.

a/Lfnewes: fl f MC; yfi'erae/f J I fizez'r dame No. 623,423. Patented Apr. I8, I899. H. m. PIERCE & w. E. POINSETT.

STAKING MACHINE.

(Application filed Apr. 21, 1898.) 2 Sheets-Sheet 2.

\imsp M/Linessw NETED STATES PATENT @rricn.

HARRY M. PIERCE AND \VILLIAM E. POINSETT, OF WILMINGTON, DELAlVA-RE.

STAKlNG-MACHINE'.

SPECIFICATION forming part of Letters Patent No. 623,423, dated April 18, 1899.

Application filed April 21, 1898. Serial No. 678,437. (No model.)

To ctZZ whom it may concern:

Be it known that we, HARRY M. PIERCE and WILLIAM E. POINSETT, citizens of the United States, residing at Wilmington, in the county of New Castle and State of Delaware, have invented certain new and useful Improvements in Staking-Machines; and we do hereby declare the following to be a full, clear,

and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to staking-m achines.

The object is to obviate the employment of cams for opening and closing the stakingjaws and in lieu thereof to provide mechanism which will operate to insure positive and even pressure on the hide throughout the entire stroke of the jaws.

With this object in view the invention consists in the novel construction and combination of parts of a staking-machine, as will be hereinafter fully described and claimed.

In the accompanying drawings, forming a part of the specification, and in which like letters and numerals of reference indicate corresponding parts, we have illustrated a form of embodiment of our invention, it being understood that other forms of embodiment thereof may be employed without departing from the spirit of the same.

In the drawings, Figure l is a view in plan. Fig. 2 is a viewin side elevation. Fig. 3is a detail view in plan, showing more particu-.

larly the mechanism for operating the staking-jaws and also for adjusting the pressureroll. Fig. 4: is a view in side elevation, partly in section, showing more clearly certain parts not seen in Fig. 3. Figs. 5, 6, and 7 are detail views in elevation, respectively, of the pressure-roll, the knives, and pressure-pad;'

and Fig. 8 is a detail view in the nature of a diagram, on an enlarged scale, showing the successive planes presented by the wedge operating the staking-jaws through one complete reciprocation thereof.

Referring to the drawings, A is the frame comprising two members suitably bolted together to present a rigid structure. Mounted upon and secured to this frame are two guides (L (b preferably circular in cross-section, upon which reciprocate suitable bearings (i carried by a cross-head a. At one end of the framethe rear end in use-are mounted journal-boxes, in which work two shafts a (t the former carrying drive-pulleys a and the lattera balance-wheel a On the inner ends of each of these shafts is socured a bell-crank lever, comprising each a long arm a and a short arm (L the short arm of each lever being set at an angle of about ninety degrees to the long arm, and connecting the longer arms of these levers with the cross-head a are two rods a the connection between the bell-crank lever and the rods beingin this instance through the medium of ordinary pins, such as are usually employed. Passing through the shorter arms 04 is a crosspin, which holds in place at that point one end of a rod (L12, the other end of which is secured to a wedge (L13, (clearly shown in Figs. 2 and 4 and in Fig. 8,) the said Wedge being held for reciprocating movement upon guides 0. firmly secured on the inside of the cross-head, as clearly shown in Fig. 3. staking-jaw levers B B are f ulcrumed at points I) on the cross-head a, the fulcrums being located near the rear ends of these levers, so as to present a long and a short arm, the short arm being at the rear. Each of these short arms carries an adjustable support 19 in each of which is journaled a roller b adapted to bear, respectively, upon the upper and under faces of the wedge (0 the rollers being always kept in close contact with the wedge by two tension-springs 17 secured to the two arms l3 l3 and to the cross-head, as will be understood by reference to Figs. 3 and 4t.

The

At the end of the long arm of the lever Bis mounted upon the lever B and in this instance comprise a straight and a curved knife, although a single knife may be used, if preferred. The means for holding the knives in operative position comprises a holder 17 secured to the ends of rods I), carried by and adjustable in the end of the lever B As before stated, this holder contains two knives, one curved and one straight. The curved knife b comes into contact with the roller b while the straight knife 19 which is directly in front of the curved knife and a trifle above the same, does not come in contact with the roller, so that proper space is presented between which the hide may be pinched. Back of the knives a short distance is a pressure-pad comprising two pieces of metal I), clamped to the rods Z7 and a third piece of metal 19", carrying a rectangular piece of fiber or steel 12". The top piece Z2 is separated from the two bottom pieces I) by two springs b Fig. 7, and are drawn down on these springs by screws, thereby effecting cushioning at this point.

The staking-table C is bolted to the front of the machine, and at the front of the stakingtable is secured a roller-pad c of any suitable substance to enable the operator to hold the skin being operated upon firmlyin place while the knives are operating thereon.

In operation the cross-head is reciprocated by the long levers a and rods a and the wedge is reciprocated by the short arms d of the bell-crank levers and the rod (L12, thus imparting to the cross-head and wedge varying velocities of a predetermined ratio. Thus when the cross-head is on a dead-center the wedge is traveling at its maximum speed and closes the levers, and with them the stakingjaws, very quickly. When the wedge is forced between the rolls b the knives and roll are closed together 011 the front end of the staking-jaw levers, putting the requisite pressure on the hide, and as the wedge is withdrawn in the operation of the machine the said levers are automatically opened by the tension of the springs 19 By changing the position of the wedge we can readily effect a change in the point of opening and closing the jaws.

As stated in the beginning of the specification, it is the object of this invention to obviate the employment of cams for opening and closing the staking-jaws. Most stakingmachines as now constructed employ these cams for this purpose, and the result is that it is utterly impossible to obtain a perfectly even pressure throughout the entire stroke of the staking-knives, for the reason that if a mechanically-perfect cam is provided for this purpose it will for a time operate with comparative satisfaction, but as soon as the perimeter of the cam becomes worn there will be an uneven pressure applied to the knives and roll, resulting in causing the knives to release their grip at one point and grip more firmly at another point, thus leaving hard places on the leather and destroying the grain of the same.

By reference'to Fig. 8 it will be seen how the wedge employed in this invention entirely obviates any possibility of an uneven operation of the knives, inasmuch as during the operation of the knives plane parallel surfaces are presented to the rollers which by contact with the wedge-surfaces close the jaws, the rollers operating as fulcrums upon which the staking-jaw levers rock. Referring to this figure, l l designate the planes on which the rollstravel when the levers are open; 2 2, the planes upon which these rolls travel when the wedge enters gradually to close the jaws, and 3 3 the planes on which the rolls travel while the jaws are closed.

Thus the jaws are held open while the rolls travel on exactly parallel planes, are gradually closed while the roll is traveling on divergent planes of equal angles, and are closed while the rolls are traveling on planes exactly parallel with each other, thus giving a perfectly uniform pressure throughout the en tire stroke of the knives.

Having thus fully described our invention, what we claim as new, and desire to secure by Letters Patent of. the United States, is

1. In a staking-machine, the combination with staking-jaw levers and a wedge to close the levers, of means for reciprocating the levers and the wedge at varying velocities of a predetermined ratio, substantially as described.

2. In a staking-machine, the combination with the staking-jaw levers, of a wedge for closing the levers, and mechanism for reciprocatin g the stakin g-j aw levers and the wedge in planes parallel with each other and at varying velocities of a predetermined ratio, substantially as described.

3. In a staking-machine, the combination with the staking-jaw levers, of a wedge movable in a plane parallel with the plane of movement of the levers, and adapted to close the levers, means for reciprocating the staking-jaw levers and the wedge at varying velocities of a predetermined ratio, and means operating automatically to open the levers at predetermined times, substantially as described. w

4. In a staking-machine, the combination with a cross-head and a wedge, of means for reciprocating the cross-head and the wedge at varying velocities of a predetermined ratio, staking-jaw levers supported by the crosshead and to be closed by the wedge,and springs for opening the levers at the proper times, substantially as described.

5. In a staking-machine, the combination ICC IOR

l'IC

with a cross-head, stakingjaw levers fulcrumed thereon, and a wedge adapted to close the levers, of bell-crank levers driven by suitable mechanism,and rods connecting the bell- V crank levers with the cross-head and with the wedge, substantially as described.

6. In a staking-machine, the combination of a reciprocatory cross-head, staking-jaw levers pivotally mounted thereon, adjustable supports carried by the rear ends of the said levers, rollers carried by the supports, a reeiproeatory Wedge adapted to bear against the rollers, and means for reciprocating the cross-head and the Wedge at varying velocities of a predetermined ratio, substantially as described.

7. In a staking-machine, the combination with the staking-jaw levers, one of which carries a roller and the other the scrapers or knives, of a Wedge movable in a plane parallel With the plane of movement of the levers, and adapted to close the levers, means for reciprocating the staking-jaw levers and the Wedge at varying velocities of a predetermined ratio, and means operating, automatically, to open the levers at predetermined times, substantially as described.

8. In a staking-machine, the combination with a cross-head, stakingjaw levers fulerumed thereon, a roller carried by one of the levers and scrapers or knives carried by the other lever, and a Wedge adapted to close the levers, bell-crank levers driven by suitable mechanism, and rods connecting the belloranl: levers with the cross-head and with the Wedge, substantially as described.

0. In a staking-machine, the combination With staking-jaw levers, of a Wedge to close the levers, the entering point of the Wedge being comparatively small and having its upper and lower sides arranged in parallel planes, the head of the Wedge being comparatively large and also having its upper and lower sides arranged in parallel planes, and the portion intermediate the end and the head being tapered, and means for reciprocating the levers and the Wedge at varying velocities of a predetermined ratio, substantially as described.

10. In a staking-machine, the combination of a reeiprocatory cross-head, staking-jaw levers pivotally mounted thereon, adjustable supports carried by the rear ends of the said levers, rollers carried by the supports, a reeiproeatory Wedge adapted to bear against the rollers, the entering point of the Wedge being comparatively small and having its upper and lower sides arranged in parallel planes, the head of the Wedge being comparatively large and also having its upper and lower sides arranged in parallel planes, and the portion intermediate the end and the head being tapered, and means for reciprocating the cross-head and the wedge at varying velocities of a predetermined ratio, substantially as described.

In testimony whereof We have hereunto set our hands in presence of two Witnesses.

HARRY M. PIERCE. WILLIAM E. POINSETT. Witnesses:

LEIGHTON COLEMAN VAN TRUMP,

CHARLES G. RUPERT.