US1998929A

US1998929A - Slitting means

Info

Publication number: US1998929A
Application number: US736283A
Authority: US
Inventors: Johnstone Robert Mcc
Original assignee: Cameron Machine Co
Current assignee: Cameron Machine Co
Priority date: 1934-07-21
Filing date: 1934-07-21
Publication date: 1935-04-23
Anticipated expiration: 1952-04-23

Description

April 1935. R, McC. JOHNSTONE 1,998,929

SLITTING MEANS Fil ul 21. 195 2 SheetsSheet 1 INV ELTOR. m /W W A TTORNE Y.

A ril 23, 1935.

R. Mccj JOHNSTONE SLITTING MEANS Filed July 21, 1934 2 Sheets-Sheet 2 A TTORNEY.

Patented Apr. 23, 1935 UNITED s TAT s PATENT OFFICE surrme MEANS 7 Robert M00. Johnstone, Short Hills, N. 1., assignor to Cameron Machine Company, Brooklyn, N. Y., a corporation of New York Application 21, 1934, Serial No. 736,283

12 Claims.

heretofore used.

In the accompanying drawings the invention is shown in several concrete and preferred em-' bodiments in which Fig. 1 is a view partly in side elevation and part ly in section of slitting means showing one form of the invention;

Fig. 2 is a fragmentary vertical sectional view substantially on the plane of line 2-4 of Fig. 1;

Fig. 3 is a view similar to Fig. 2 showing a modifled form of the invention; I

Fig. 4. is a view similar to Fig. 1 showing still another modification of the invention;

Fig. 5 is a view looking in the direction of arrow -5 of Fig. 1; and

Fig. 6 is a view looking in the direction of arrow 6 of Fig. 5.

. I 0 indicates a backing member in the form of a rotatable smooth-face roller having a glasshard surface with which cooperates a rotatable score-cut slitter il in suchmanner that, when a web of flexible material is passed between the .two elements, said material is slitted lengthwise in accordance with well-blown practice. I Referring to Figs. 1, 2 and 5, the score-cutter 1s confined between side cheeks l2, of a slitter holder i3, provided with slots it having an enlarged lower portion i5, and into these slots fit shouldered studs i6, so that the slitter is rotatably and slidably carried.

In the normal'operation of a score-cut slitting device the cutting edge acts against the material to be slitted and the score-cut slitter penetrates the web and presses against the platen roll or' backing member that supports the web; the slitting operation occurring by the rotation of the platen roll and the score-cut slitter. It is evident therefore that the score-cut slitter should have a correct profile for satisfactory action, and that in the operation of the mechanism which occurs with a'rolling action under pressure, there will be some distortionand change of shape of the slitter edge. The reconditioning device, consisting of a grooved roller ll, engages the cutting edge i8 of the slitter, and the profile of the groove ,in the reconditioning roller being the correct.

profile of the slitter, it will be seen that the continued engagementof the reconditioning roller with cutting'edge iii of slitter I lwill roll the edge on the slitter back to its correct shape, overcoming to a major extent the deformation of the slitter profile caused by its rolling engagement with the platen roll. Roller I1 is mounted by anti-friction means (not shown) on a carrier here in the form of a lever I 9 pivoted-at 20' on .the slitter holder. The free end of lever 19 carries 5 an. adjustable screw 2| against which bears an expansion spring 22 anchored on bracket 23 of the slitter holder. It will now be seen that, as slitting takes place, the slitter engages the grooved roller and has its cutting edge simultane- 1 ous'ly reconditioned. It will be apparent that the reconditioning device need not be the only means that supports the slitter-to keep it against the backing member, and therefore that the tension of spring 22 need not be depended upon to exert cutting pressure as between the slitter and the backing member. In the present instance, however, it is preferred. to have the reconditioning device as the sole supporting means for the slitter n and said spring is therefore of such character as to exert cutting pressure. The advantage of having the spring exercise this double function will be understood when the remaining elements of the slitter mounting are considered. As here shown, slitter holder I3 is carried on a rail or support 24 having inclined facesas shown to which said holder is clamped by means of bolt 25 and on which it can be adjusted lengthwise. Rail 24 usually carries a number of slitter holders and is supported by one or more arms 26 mounted loosely on shaft 21, that is mounted in eccentric bearings 21a. 28 indicates a pair of toggles pivoted at 29 on the framework and connected at 29a to the slitter holder. 30 indicates a positive stop on the framework and 3| is a handle for operating the toggles. Shaft '21 carries a handle 21b and also a ratchet 21c-with which engages a pawl 21d. To cause the slitter to engage the backing member, the toggles are first straightened and brought against stop 30, this part'of the operation causing the slitter to be moved adjacent to or barely touching the backing member. Handle 21b is now operated to turn shaft .21 in its eccentric bearings therebyrotating ratchet 21b after which the pawl is placed in engagement with the ratchet. Thisbrings the slitter into cutting engagement with the backing member. As a rule several slitting elements are associated with backing member ID being-all mounted on rail 24 and r in order to compensate for unequal wear of the slitters, so as to obtain uniform cutting pressure of all the slitters, springs 22 of the diiferent slitters will be unequally adjusted. 'If it is now nece'ssary to disengage the slitters with backing member l0, handle 3| is operated in a direction brought back until they strike stop 30.

reverse to that previously described, and it will be observed that when thereaiter restoring. the slitters to engagement with the backing member exactly the same cutting pressure as before will be obtained without requiring any adjustment of springs 22 because the position of shaft 21 has not been disturbed and the toggles will always be with which the slitter can be removed will also be noted for, after breaking the toggles, it is only necessary to move the slitter down to enlarged portion l5 of slot l4 when the shoulder stud Hi can be pushed sidewise thereby releasing the slitter. I

It is not necessary in all cases to employ roller l! as a reconditioning member; thus, in Fig. 3, roller Ila is shownsmooth faced and acts merely as a supporting member to engage the periphery of the slitter.

In Fig. 4 is found a modification of the invention. In this case a plurality of rollers llb are employed forming a cradle for the support of the slitter, and it will be noted that, when this construction is employed, it is no longer necessary to employ a slot like H or a shouldered stud as I6 of Figs. 1 and 2 because the two rollers I'Ib together with side cheeks l2b form adequate supporting and guiding means. Rollers I'Ib can be either grooved as in Fig. 2 or smooth faced as in Fig. 3.

I claim:

1. slitting means including: a backing member; a rotatable score-cut slitterto rotatively engage said backing member; and a reconditioning device to engage the cutting edge of the: slitter when the latter engages the backing member whereby when the slitter is rotated against the backing member to slit material its cuttin edge is simultaneously reconditioned.

2. slitting means including: a backing member; a rotatable score-cut slitter to rotatively engage said backing member; and rotatable pressure-exerting means to engage the periphery of the slitter to hold said slitter under cutting pressure against said backing member.

3. slitting means including: a backing member; a rotatable score-cut slitter to rotatively engage said backing member; and a rotatable reconditioning device 'having a circumferential groove for the reception of the cutting edge of the slitter when the latter engages the backing mem ber whereby when the slitter is rotated against the backing member to slit material its cutting edge is simultaneously reconditioned.

4. Slitting means including: a backing member; a rotatable score-cut slitter to rotatively engage said backing member; and a combined pressure-exerting and reconditioning device, rotatably mounted, to engage the cutting edge of the slitter to hold said slitter under cutting pressure against said backing member.

5. slitting means including: a-backing member; a slitter holder; a score-cut slitter, to engage the backing member, slidingly and rotatively carried by the slitter holder; and rotatable pressure-exerting means to engage the periphery of the slitter to hold said slitter under cutting pressure against the backing member.

6. slitting means including: a backing mem- The ease ber; a slitter holder; a score-cut slitter, to engage the backing member, slidingly and rota-, tively carried by the slitter holder; and a combined pressure-exerting and reconditioning device, rotatively mounted, to engage the cutting edge of the slitter to hold said slitter under cutting pressure against the backing member.

7 slitting means including: a backing member; a slitter holder; a score-cut slitter, to engage the backing member, slidingly and rotatively carried by the slitter holder; a plurality of rotatable rollers forming a cradle to support the slitter against the backing member by engaging the periphery of the slitter; and a pressure-exerting carrier for the rollers to hold, through the rollers, the slitter with cutting pressure against the backing member. a

8. slitting means including: a backing member; a slitter holder; a score-cut slitter, to engage the backing member, slidingly and rotatively carried by the slitter holder; a plurality of rotatable reconditioning rollers forming a cradle to support the slitter against the backing mem-- her by engaging the cutting edge of the slitter; and a pressure-exerting carrier for the rollers to hold, through'the rollers, the slitter with cutting pressure against the backing member, whereby the slitter is also reconditioned by the rollers when slitting against the backing member. 9. slitting means including: a backing member; a slitter holder; a score-cut slitter rotatably carried by the slitter holder; adjustable pressureexerting means for the slitter; an eccentrically and adjustably mounted shalt carrying the slitter holder; and means to turn the slitter holder on the eccentrically mounted shaft.

10. slitting means including: a backing member; a slitter holder a score-cut slitter rotatably carried by the slitter holder; adjustable pressure exerting means for the slitter; an eccentrically and adjustably mounted shaft carrying the slitter holder; and a pair of toggles to turn the slitter holder on the eccentrically mounted shaft.

11. Slitting means including: a backing member; a support; a slitter holder adjustable lengthwise on the support; a score-cut slitter rotatably carried by the slitter holder; adjustable pressure-exerting means for the slitter; adjustable means to move the support, and thereby the slitter holder, toward and away from the backing member; and asecond means to move the support, and thereby the slitter holder, toward and away from the backing member, without disturbing the adjustment of the' first means for moving the support.

12. slitting means including: a backing member; a support; a plurality oi. slitter holders carried by the support; a score-cut slitter rotatably carried by each slitter holder; adjustable pressure-exerting means for each slitter; adjustable,

means to move the support, and thereby the plurality of slitter holders, toward and away from the backing member; and a second means to move the support. and thereby the plurality of slitter holders, toward and away irom the backing member, without disturbing the adjustment of the first means for moving the support.

ROBERT McC. JOHNSTONE.