US744754A - Paper-cutting machine. - Google Patents

Description

- No. 744,754. PATENTED NOV..24, 1903. W. H. HANSBLL.

PAPER CUTTING MACHINE.

APPLICATION FILED D SC. 8, I902.

v 2 SHEETS-SHEET 1.

N0 MODEL.

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No. 744,754. PATENTED NOV. 24, 19.03.

- W. H. HANSBIJL.

PAPER CUTTING MACHINE.

APPLICATION FILED DEC. 8, 1902. I

N0 MODEL. I 2 SHBETS SHEET 2.

UNITED STATES Patented November 24, 1903.

PATENT OFFICE.

WILLIAM HENRY HANSELL, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO HENRY L. EGBERT, OF NEW YORK, N. Y.

PAPER-CUTTING MACHINE.

' SPECIFICATION forming part of Letters Patent No. 744,754, dated November 24, 1903.

v Application f led December 8, 1902. Serial No. 134,228. (No model) I To all whom it may concern Be it known that 1, WILLIAM HENRY HAN- SELL, of the city and county of Philadelphia, State of Pennsylvania, have invented an Improvement in Paper- Cutting Machines, of which the following is a specification. I

It is one of the objects of my invention to enable the clamp whose operations are controlled by the knife-bar to impose a constant and uniform clamping pressure upon 'the paper irrespective of the extent of movement of the knife or the depth of the out.

It is also an object of the invention to produce a uniform clamping pressure upon thepaper irrespective of the height of the pile,

so that the same clamping pressure will be exerted by the clamp whether the clamp is acting on a single sheet or on a pile of paper several inches in height.

The attainment of these'objects insures that the paper may always be clamped with the proper amount of pressure notwithstanding variations in the height of the pile, and consequentlydefective cutting due to insufii ciency of clamping pressure and injury to the paper due to excess of clamping pressure are avoided. It also insures uniform cutting irrespective of the extent of movement ofthe knife or the height of the pile of paper.

It is also an object of my invention to enable the amount of clamping pressure to be adjusted to suit the character-of the paper to be cut, so that injury from excessive clamping pressure in light paper may be avoided.

It is also an object of my invention to insure the application of the full clamping pressure before the knife commences its cutting operation and not to release the clamping pressure until the completion of the cutting operation and the knife has commenced to return. i.

In carrying out my invention I employ, in combination with the .usual reciprocating knife-bar and its knife and the clamping-bar and its clamp, operated by the knife-bar, of pressure-creating devices to impart a constant and uniform pressure to the clampingbar, which are operated by the knife-bar and controlled by the movements of the clampingbar in such manner that they are thrown into action when the movement of the clampingcarrying frame.

bar is arrested by the contact of its clamp with the paper, but are uniform in their action and are not affected in the amount of clamping pressure produced by the extent of the movement of the knife-bar.

. The particular pressure-creating devices which I prefer to employ in carrying out my invention consist of friction-creating devices, such as a brake-wheel and brake-band, carried by the clamping-bar andoperated by the movement of the knife-barwhen the movement of the clamping-bar is arrested by the paper. As the amount of clamping pressure depends wholly upon the amount of friction produced by said friction-creating devices, it is obvious that such pressure will be constant and will not be affected by the extent of movement of the knife during the act of cutting or the height of the pile of paper and also that the amount of the clamping pressure may be adjusted to suit the character of the paper to be clamped by the adjustment of the friction-creating devices.

The details of my inventionwill be better understood by a reference to the accompanying drawings.

Figure 1 is a rear elevation ofthe upper portion of a paper-cutting machine embodying the invention. Fig. 2 is a front elevation of one end of the clamping-bar. Fig. 3 is a vertical sectional view onthe line 3 30f Fig. 1. Fig. 4. shows a plan and side elevation of the clutch orv pawl for operating the frictionwheel; Fig. 5 is a detailplan View of the friction-band. Fig. 6 shows afplan on side elevation of the clutch-operating arm. Fig.

v7 shows a plan and side elevation of the pawl- Fig. '8 is a plan view of the friction-wheel, and Fig. 9 is a transverse sectional view of the same on the line 9 9 of Fig. 8.

The clamping-bar a is guided in the usual manner in the vertical guides at a of the main frame and is operated by the knife-bar 'b, by which it is supported by rollers or studs b on the knife-bar, which engage forked levers c on the clamping-bar. Only one pair of these forked, levers and rollers is shown in Fig. 2; but it is to be understood that two are used in practice, one set located at each end. The knife-bar b is operated i the usual manner to reciprocate vertically and to have a longitudinal movement. As the means for imparting these movements to the knife-bar are usual and well known in the art and form no part of my invention, they are not shown in detail, though one 'of the knife-bar'operating arms or links I) is shown at one end of the machine in Fig. 1.

The forked levers care provided with toothed segments (2, which engage a pinion e, carried on a pin a, journaled in the clamping-bar. Secured to the outer end of the pin (2 is a cross-bar f, provided on its ends with lugs g.

The pin 8 is journaled in a hub j of the clamping-bar, and journaled loosely on the hub 7" is a band or brake wheel j, which is embraced by a brake-band k.

A ring frame it, supported on the hub m of the band or brake wheel, carries two pivoted pawls or dogs 2', which are pivoted at i in recesses i in the ring frame and are adapted when rocked to move inwardly into contact with the surface of the hub m of the brakewheel.

The pawls or clutches 'i are provided with arms at, having more or less elongated slots 11, whicjh are engaged by the lugs g of the crossbar The brake-band 7c encircles the brake-Wheel with frictional contact, the amount of which may be adjusted to produce the desired pressure in the clamping-bar. In the construction shown the brake-band consists of two members k hinged together at 70 One end of the brake-band is fastened to the frame of the clamping-bar, as at 70 and the other end is connected with adjustable devices to regulate the tension, which, as shown, consist of a longitudinally adjustable rod 0. The rod is shown provided on its end with a strap 0, encircling an eccentric p on a crankarm 19, journaled in the clamping-bar and provided with a pin 13 which is engaged by a jaw 15 of a link t, hinged at t to a crankarm 25 of a pin i jonrnaled in the clampingbar frame and carrying a wheel 15, by which the arm i may be adjusted to adjust the rod and the tension of the brake-bands 7c 70.

In the machine shown in the drawings there are two of these pressurecreating devices, and the brake-band of each is connected with the rod 0, so that both bands may be adjusted simultaneously and equally. The rod 0 is also made with adjustable sections 0 so that one brake-band may be adjusted independently of the other to compensate for any inequality in Wear between the two band-wheels or other parts of the two pressure-creating devices.

In smaller machines only one of the pressurecreating devices is required.

When the clamping-bar and knife-bar are in elevated position, the clamping-bar is supported wholly by the knife-bar by the rollers 19' and pivoted forks c which are held against upward movement by the lugs c, Fig. 2. As

the knife-bar descends it lowers the clamping-bar with it without movement in the pivoted forks 0 until the clamp is in contact with the surface of the paper. When the movement of the clamping-bar is arrested by the paper, the knife sis elevated a short distance (in practice about an inch)rabove the clamping-surface, and as the knife-bar continues to descend the forks c are rocked by the pins 1) and the pinions e are rotated by the segments d. The rotation of the pinions 6 turns the cross-bars f through the pins 6, and the lugs g of the cross-bars move inward in the slots n of the pawls, and thus throw the pawls into engagement with the surface of the hubs in of the bandwheels. This causes the band-wheels to rotate with the pinions e in frictional contact'with the brakebands 70, and as the clamping-bar is resting on the paper the movement of the knife-bar will impart to the clamp a pressure proportional to the friction of the brake-bands on the band-wheels.

As the pressure is produced by the friction of the brake-bands on the bandwheels it is constant and uniform and does not increase as the knife continues to descend, so that throughout the cutting action the same pressure is maintained.

As the pressure is prod need when the clamping-bar is brought in contact with the paper and wholly by the action of the brake-bands, it is obvious that the pressure will be the same irrespective of the height of the paper or the depth of the out. In practice it has been demonstrated that exactly the same pressure is produced on a single sheet as on the surface of a pile several inches high.

By so locating the knife that it is elevated slightly above the clamp, as shown in Fig. 3, the clamping pressure will be applied before the knife comes into cutting action. While the slight lost motion due to the movement of the lugs g in the elongated slots n of the pawls or clutches t' permits a slight movement of the knife after the clamp makes contact with the paper and before the clamping pressure is applied by the operation of the friction-creating devices, the extent of this lost motion is not suflicient to enable the knife to come into cutting action before the clamping pressure is applied; but on the return movement this lost motion is of special advantage, since it enables the knife to rise slightly before the pressure-creating devices are released, and thus insures the maintenance of the clamping pressure until after the cut is finished.

On the return movement the segments cl and pinions e are rocked back. This moves the lugs g outward in the slots n and disengages the clutches i from the hubs m of the band wheels, thus throwing the frictioncreating devices out of action.

The details of the construction shown may be varied without departing from the spirit of my invention.

What I claim as new, and desire to secure by Letters Patent, is as follows:

I clamp, and means carried by the knife-bar to operate the clamping-bar embracing pressure-creating devices actuated by the stoppage of the clamping-bar to impart a uniform pressure'thereto irrespective of the ex tent of movement of the knife-bar.

2. In a:paper-cutting machine, the combination with a reciprocating knife-bar and knife, of a reciprocating clamping-bar and clamp and means carried by the knife-bar to operate the clamping-bar embracing pressure-creating devices to impart pressure to the clamping-bar when the clamp is in contact with the paper.

3. In a paper-cutting machine, the combi nation with a reciprocating knifebar and knife, of a reciprocating clamping-bar and clamp, means carried by the knife-bar to operate the clamping-bar embracing pressurecreating devices adapted to impart a uniform pressure to the clamping-bar when the movement of the clamping-bar is arrested irrespective of the extent of movement of the knife-bar, and means to regulate said pressure-creating devices to vary the amount of pressure produced thereby.

4. In a paper-cutting machine, the combination with a reciprocating knife-bar and knife, of a reciprocating clamping-bar and clamp operated by the knife-bar, and frictioncreating devices carried by the clamping-bar and operated by the movement of the knifebar under the control of the reciprocation of the clamping bar, whereby said frictioncreating devices are thrown into operation by the movement of the knife-bar, when the movement of the clamping-bar is arrested by the paper, and a uniform pressure isimparted to the clamping-barirrespective of the extent of movement of the. knife-bar or the height of the paper being out.

5. In a paper-cutting machine, the combination with the reciprocating knife-bar and knife, of a reciprocating clamping-bar and clamp operated by the knife-bar, frictioncreating devices carried by the clamping-bar, means operated by the movement of the knife-bar and controlled by the movement of the clamping-bar to operate said frictioncreating devices when the movement of the clamping-bar is arrested, embracing clutch devices adapted to act upon the frictioncreating devices.

6. In a paper-cutting machine, the combination with the reciprocating knife-bar and knife, of a reciprocating clamping-bar and clamp'operated by the knife-bar, friction,-

creating devices carried by the clam ping-bar, means operated by the movement of the knifebar and controlled by the movement of the clamping-bar to operate said friction-creating devices when the movement of the clamp-,

ing-bar is arrested, embracing clutch devices adapted to act upon the friction-creating de- Vices, said clutch devices having provision for lost motion whereby a slightmovement may be permitted in the knife-bar after the clam ping-bar is arrested before said clutch devices operate the friction-creating devices.

7. In a paper-cutting machine, the combination with the reciprocating knife-bar and knife, of a reciprocating clamping-bar and clamp operated by the knifebar, a brakewheel carried by the clamping-bar, a brake acting on saidband-wheel to impose a uniform friction thereon when the brake-wheel is operated, and means operated by the movement of the knife-bar and controlled by the movement of the clamping-bar to rotate said brakewheel when the movement of the clampingbar is arrested by the paper to be cut.

8. In a paper-cutting machine, the combination with the reciprocating knife-bar and knife, of a reciprocatingclamping-bar and clamp operated by the knife-bar, a brakewheel carried by the clamping-bar, a brake acting on said brake-wheel to impose a uniform friction thereon when the brake-wheel is operated, clutch devices adapted to act on the brake-wheel, operated by the movement of the knife-bar and controlled by the movement of the clamping-bar, to rotate the brake-wheel when the movement of the clamping-bar is arrested by the paper to be cut.

9. In a paper-cutting machine, the combiact on said brake-wheel,a clutch device adapt- I ed to act on the brake-wheehmeans to actuate said clutch device, a pinion on the clamp-' ing-bar for operating said means to actuate the clutch device, and means operated by the movement of the knife-bar and controlled by the movement of the clamping-bar to actuate said pinion,=when the movement of the clamping-bar is arrested. 7

10. In a paper-cutting machine, the combination with the reciprocating knife-bar and knife, of a, reciprocating clamping-bar and clamp operated by the knife-bar, a brake wheel carried by the clamping-bar, a brake. carried by the clamping-bar and, adapted to act on said brake-wheel, a'pivoted segment carried by the clamping-bar and adapted to be operated by the knife-bar when the movement of the clamping-bar is arrested, a pinion engaging said segment, a clutch-frame arranged adjacent to said brake-wheel, movable clutches carried by said clutch-frame and adapted to engage the brake-wheel,and means operated by the pinion to control said clutches and throw them into engagement with thebrake-Wheel when said pinion is operated in one direction and to release them when the pinion is operated in the other direction.

11. In a paper-cutting machine, the combination with the reciprocating knife-bar and knife, of a reciprocating clampingbar and clamp operated by the knife-bar, a brakewheel carried by the clamping-bar, a brake carried by the clamping-bar and adapted to act on said brake-wheel, a pivoted segment carried by the clamping-bar and adapted to be operated by the knife-bar when the movement of the clamping-bar is arrested, a pinion engaging said segment, a clutch-frame arranged adjacent to said brake-wheel, movable clutches 2' carried by said clutch-frame l I I

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