US2379171A

US2379171A - Paper-cutting machine

Info

Publication number: US2379171A
Application number: US509055A
Authority: US
Inventors: Frederick D Mclaughlin
Original assignee: Chandler and Price Co
Current assignee: Chandler and Price Co
Priority date: 1943-11-05
Filing date: 1943-11-05
Publication date: 1945-06-26
Anticipated expiration: 1962-06-26

Description

June 26, 1 9 45. MCLAUGHLIN 2,379,171

PAPER CUTTING MACHINE Filed Nov. 5, 1945 2 Sheets-Sheet l INVENTOR. FREDERICK D.McLAUGHLlN m ww ATTORNEYS June 26, 1945.

F. D. M LAUGH-LIN.

PAPER CUTTING MACHINE Filed Nov; 5, 1945 Z'Sheets-Sheet 2 INVENTOR.

FREDERICK D. Mc LAUGHLIN .w s 5 W III lhml will!!! I Patented June 26, 1945 PAPElit-CUTTIN G MACHINE Frederick D. McLaughlin, Shaker Heights, Ohio, assignor to The Ehandler & Price Company, Cleveland, (ihio, a corporation of Ohio Application November 5, l9 4,@Serlal No. 509,055

8 Elaims.

The present improvements, relating as indicated to paper cutting machines, have more particular regard to means for operating the cutter bar in such machines.

In paper cutters such as are employed in print shops and book binding establishments, as is well known, a stack of sheets supported against a gauge on a suitable table is clamped in place and a knife is forced downwardly through the stack in order to cut the same to desired dimensions. In heavier machines it is usual to employ power to operate the bar which carries such knife or cutter and also in some cases the clamp. While I am aware that in Patent No. i,&80,598 to R. S. Tyler et al., dated October d, N32, hydraulic power means are disclosed for operating the latter, so far as I know similar means have never been successfully applied to the operation of the knife or cutting mechanism proper.

One object accordingly of the present invention is a) provide hydraulic means suitable for opersting the knife or cutter bar in a paper cutting machine of the type in question. A further object is to provide such a mechanism which will pull or force the knife through the paper to be cut and then return the knife to the top of its stroke ready for fresh operation. Another object is to provide a control for such hydraulic means which will render it necessary for the operator to utilize both hands when the knife is thus being pulled or moved to cut the paper.

To the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafter fully described and particularly pointed out in the claims.

The annexed drawings and the following description set forth in detail certain mechanism ment to the knife.

embodying the invention, such disclosed means constituting, however, but one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawings:

Fig. l is a front elevation of a paper cutting machine wherein my improved hydraulic operating means have been incorporated;

Fig. 2 is an end elevation of such machine as viewed from the right in Fig. 1;

Fig. 3 is a lay-out more or less schematic in character of the hydraulic operating means; and

Fig. 4 is a. sectional detail of the connection between the hydraulic piston and knife bar of the machine.

Referring to the general construction of the machine as illustrated in Figs. 1 and 2, such maon which is supported the table 2 designed to receive the stack or pile of sheets to be cut. For

the purpose in hand it has been deemed unnecessary to illustrate either the adjustable gauge whereby such stack would be located on said table or the clamp whereby the stack after being thus located is firmly held in place during the cutting operation.

Rising above bed I at each end thereof are slotted side frames 3 which are connected above by a cross member It. The slots in such side frame reciprocably receive the bar or frame 5 to the lower edge of which the knife 6 is attached. Such knife bar is supported by means of parallel links 7 from cross frame member 4 so that upon being lowered from the position shown in Fig. 1 said bar, together with the knife 6 carried thereby, will at the same time be moved longitudinally so as to impart desired sliding cutting move- One end to of knife bar 5 is extended so as to project beyond the adjacent slotted side frame 3 and it is to this end that the hydraulic operating means now to be described are connected. I

The principal element of such hydraulic operating means is a cylinder l0 fixedly secured to the front face of main frame 3 at an angle such that its axis will be approximately aligned with the outer end of projection 5a on the knife bar. A piston H reciprocably mounted in said cylinder carries a piston rod l2 which projects through the upper end of the cylinder and is connected by means of a link l3 with said cutter bar projection to. This link, as best shown in Fig. a, comprises two rod-like parts, the adjacent ends of which are oppositely threaded and are engaged by a correspondingly threaded nut hi so that by rotation of the latter said link may be lengthened or shortened within limits as desired. By the means just described it will be seen that the position of the knife at the end of its cutting stroke can be changed without. altering the stroke of the piston.

A pump 20 is provided to supply oil or other liquid through suitable connections to the respective ends of cylinder ill whereby reciprocation of piston H is effected. Such pump 26 is preferably of the circulating type having a variable displacement at constant speed so as to deliver a practically pulsationless. current of oil to the cylinder. Such oil is taken from a tank 2| and discharged through a main line 22 in whichis interposed a valve 23 for relieving excessive pressure through a connection 24 to the chine will be seen to comprise a suitable base i return line 25. g H j The flow of liquid supplied by the pump through line 22 and the return of such liquid through line 25 is subject to the control of two

valves

26 and 21 respectively equipped with

operating levers

28 and 29 which project forwardly from the machine below table 2 within convenient reach of the operator as he stands in front of the machine. As will be presently explained, it is necessary for the operator to grasp both these levers by his respective hands and thus actuate the corresponding valves in order to effect downward movement of the knife bar, and if either hand be removed from the control lever movement of the bar will automatically stop. In this way it is rendered certain that the operator's hands will be at all times out of danger from the descending knife.

Associated with

control valves

26 and 21, a third valve 30 is provided adjacent the upper end of the cylinder Hi, this valve constituting an automatic kick-out which prevents further movement of the piston in the cylinder and thus of the knife bar at the upper end of the stroke of said piston, i. e. when said knife bar has been raised to its uppermost position. This valve is designed to be operated by means of a camshaped dog 3| adiustably mounted on an arm 32 attached in parallel relation to piston rod l2. By shifting the position of the dog on said rod the point in the movement of the piston at which the supply of fluid producing the upward stroke is thus automatically cut 0115 by valve 30 may be varied. In other words, depending upon the height of the stack of paper to be cut, the knife bar may be brought to a stop at any desired eie-. vation above the table 2 and there held ready for a repeat operation by again actuating simultaneously the two control valves 2i and 21.

The particular construction of

valves

26, 21 and 3. forms no part of the present invention, but typical valves suitable for the purpose are diagrammatically illustrated in Fig. 3 along with the connections therebetween and with the cylinder l and the main supply and

return lines

22 and 25. As thus illustrated, the valves are of multiport type with a plurality of pistons on a common stem so that by shifting such stems the aforesaid lines or'branches thereof may be variously connected. Thus in the position of parts shown in Fig. 3 which represents the idle position of the machine, i. e. that in which the knife bar is in raised position, the following connections obtain, viz.: There is an open path of flow for the liquid supplied to line 22 through branch 35, connected ports in valve 26, branch 36, connected ports in valve 21 to branch 31 of the return line. At the same time the connection between valve 21 and the lower end of piston It) by way of branch 28 is'closed so that the pressure of the liquid supplied through branch 39 to the upper end of the cylinder is ineffective to move the piston in said cylinder downwardly. The port in valve 21 wherewith branch 28 is connected was closed when the piston reached its indicated position due to actuation of valve 30 which served to place in communication through said valve, branch 40 leading from branch 26, and branch ll, which leads to the lower end of said valve 21, with the result that the pistoncarrying stem of said valve is moved upwardly. An inspection of the lay-out of Fig. 3 will show that downward movement of the stem of either valve 28 or valve 21 alone, and corresponding displacement of the pistons carried by said stems will be ineffective to change the pressure conditions in cylinder l0. However, upon pressing both of said valve stems downwardly the following connections will be established between the main supply line 22 and return line 2!, viz.: Branch 39 to the upper end of cylinder I! remains open but branch 38 from the lower end of said cylinder is connected through the ports of valve 21 to branch 36 and through ports in valve 26 to branch 42 which leads to return line 25. Accordingly, the pressure on the under side of the piston in cylinder Ill is relieved and the piston will move downwardly imparting to the knife a corresponding downward or cutting stroke. Upon the completion of such stroke the operator, by releasing pressure on the stems of both

valves

26 and 21, will permit the latter to return to the idle position first described above. Incidentally t the downward movement of the piston in cylinder Ill, valve II being relieved from engagement with dog 3| returns to its normal position in which branch ll is connected through the ports in said valve with branch 43 and thence to the return line 25. In this condition the valve is again ready upon reengagement of the dog with its stem to cut oil? the upward movement of the piston and cylinder II when the latter is again operated.

From the foregoing description it will be seen that with the pump running so asto supply oil or equivalent liquid under substantially constant pressure to line 25, the piston in cylinder II will normally actuate the knife bar to raise the same, and in order to cause reverse movement of, the piston to lower the knife bar it is necessary for the operator to depress the stems of both of the

valves

26 and 21. At any time during such down stroke of the piston and blade such stroke may be reversed by releasing the control valves. Moreover, the adjustable dog associated with the rod of piston H in cylinder Ill whenever it engages the stem of valve 20 will stop further upward movement of said piston, leaving the same ready for actuation downwardly whenever the operator is ready to repeat the cutting operation. 'The use of dual control valves it will be seen makesit absolutely necessary for the operator to have both hands on 'the levers which operate said valves and these being located at some distance from the cutting knife it is impossible for either hand to be caught by the latter as it descends. for the moment either hand is removed from the corresponding control lever, operation of the piston l l is automatically stopped.

It will be noted that the parallel links 1 whereby knife bar 5 is supported from cross frame member l are inclined at an angle to the latter, or in other words to the horizontal, and that the angle at which the cylinder l0, and thus the piston which operates in said cylinder is secured to the main frame, is opposite to that of said links. The effectiveness of the action of the piston on its down stroke is thus increased, the lateral shifting movement of the knife bar being taken care of by the link connection between the piston and the projecting end of said bar. At the same time by making such link adjustable the extent of the downward stroke of the knife can be very nicely gauged.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means stated by any of the following claims or the equivalent of such stated means be employed.

I therefore particularly point out and distinctly claim as my invention:

1. In a paper cutting machine, the combination of a reciprocable knife, hydraulic means for reciprocating said knife, dual controls for said means, said controls requiring simultaneous actuation to be effective, and an adjustable stop limiting operation of said means in one direction.

2. In a paper cutting machine, the combination of a reciprocable knife, hydraulic means for reciprocating said knife, dual controls for said means, said controls requiring simultaneous actuation to be effective, and an adjustable stop adapted to render said controls ineffective.

3. In a paper cutting machine, the combination of a table, a knife reciprocable towards and from said table, a cylinder and piston adapted to reciprocate said knife, connections for supplying fluid under pressure to opposite ends of said cylinder, and dual valves controlling said connections, said valves requiring to be simultaneously actuated to effect movement of said knife towards said table.

4. In a paper cutting machine, the combination of a table, a knife reciprocable towards and from said table, a cylinder and piston adapted to reciprocate said knife, connections for supplying fluid under pressure to opposite ends of said cylinder, dual valves controlling said connections, said valves requiring to be simultaneously actuated to effect movement of said knife towards said table, and an adjustable stop movable conjointly with said piston adapted to render said controls ineffective.

5. In a paper cutting machine, the combination of a table, a knife reciprocable towards and from said table, a cylinder and piston adapted to reciprocate said knife, connections for supplying fluid under pressure to opposite ends of said cylinder, said cylinder being mounted in fixed relation to said table and said piston having link connection with said knife, and an adjustable stop movable conjointly with said piston adapted to cut off such fluid supply upon predetermined upward movement of said knife.

6. In a paper cutting machine, the combination of a table, a knife reciprocable towards and from said table, angularly disposed parallel links supporting said knife, a cylinder and piston adapted to reciprocate said knife, said piston being mounted in fixed relation to said table at an angle opposite to the angle of said links, and another link connecting said piston with one end of said blade.

7. In a paper cutting machine, the combination of a table, a knife reciprocable towards and from said table, a cylinder and piston adapted to reciprocate said knife, connections for supplying fluid under pressure to opposite ends of said cylinder, dual valves controlling said connections, said valves requiring to be simultaneously actuated to effect movement of said knife towards said table, and levers for actuating said valves disposed below said table.

8. In a paper cutting machine the combination of a table, a knife reciprocable towards and from said table. angularly disposed parallel links supporting said knife, a cylinder and piston adapted to reciprocate said knife, said piston being mounted in fixed relation to said table at an angle opposite to the angle of said links, and another link connecting said piston with one end of said blade, said last-named link being adjustable in length.

FREDERICK D. McLAUGHLIN.