US2007731A - Cutting mechanism for printing machine folders - Google Patents

Description

J. R. ToMLlN 2,007,7M

CUTTING MEGHANISM FOR PRINTING MACHINE FOLDERS Emily @y 135.,

Filed April 22, 1935 .MVW m bm .mwg ...m N Y i,.brul NEUE... o m QN/ V S N- bm: u NQ I N m,\w\ EXHHWN l ,L N .3.. mmsfkm w\ .a w67..- hw o mzul o@ mm. 8. NN fm1 |N\ f," ........u B MM 3 l etui.

Patented July 9,'1935 'MECHANISM- FOR PRINTING MACHINE romans -John RQ lmlnli'n,V Alexandria, Va., assignor to Irving`-Tri1st Company, permanent trustee for Y tion of-New York R; Hoe & Co., Inc., New

York, N. lY., a corpora- Applieatiunnpil 22, ieaseriai No. 667,462

` 16 claims. n(c1. 164-66) Thisinvention relates to certain improvements in `cutting blocks or rubbers for use inprinting machine -folders, ,and especially the'type com-q monlykn'own inithe art as "three to two folders,v

`tf in vwhich the product is 'cut iny long andfshort sheets and assembled. i

. Inf-certain types of 'cutting mechanismfused for Ithis purpose, :a rotary cutter is employed whchone ofthe cutting knives or cutting blades 'f isi mounted slightly sles`s-thanf180 'behind the other,A so that the. cutting blades reach their cutting' position 'atfdifferentf points on the cooperating fldingand `collecting cylinder;

It isv an `object of this invention toV improve lthe construction `o1 these, cutting i .blocks vor' rubbers sothatlongfand short sheets maybe cut, anditi isI the especialfobect'of l'the invention to provide aniinproved cutting block -for use in'the type of` printing machine folders gdsclosedwin mycopending application on Folding mechanism, `SerialiNo. 492,990, led November 3; 1930; In this type folder :the Icutting blades, althoughoperably; l mountednon vthe cutting cylinder',l arefarranged.

to' maintain radial t disposition with respect tothe axis oithefoldinglor collecting cylinderfduring the entire cutting operation. `Inasmuch as @the cutting;V blades Iare maintainedtirroughout :their entirecutting i operation .in-A radialrelationship With-respect to the axis ofthe folding and col-1 lectingcylinder, it ismanifest that no `operative lateral movement ofthe cutting bladeftakes place in the rubber during 'the lcutting ,operationA On the contrarythef cutting blade` moves: radially into the cutting block during its cuttingoperation and .then lwithdraws radially from "the ,cutting block afterthe sheetis vsevered.-` Y It has -beendef l terminedhy experience-,and*experimentsithat ,re-A

silientymat/erial, 1suclras rubbenor substance ot in providing ,cutting blocks for uselin. folders'of this type, and ithas :been-,determined that narr'owgslots 'preffcrmed in thefcutting -rubber for receivingY the gcutting ,blades prolongs, the lifeof the rubber and improves the appearance"of,V the product. Furthermore, it has been 'discovered thatthe provision of Va narrowpreffornied slot With afwidth slightlyin excess "of the minutelat.- eral dimensionjof the'cuttingjedge, j but oiless width than the thickness of the cooperating;cut-- tingbladegis advantageousg, If'. the'slots are out by the l.cutting i blades during their linitial operative contact with thecutting rubber,y in con.` formitynvvith the usual practice, theV sidewalls o'f 'theslolts' so cut'` close' against each other'- after the cutting blade is' Withdrawn",-V ahd'anyminute like characteristics, isemployed tor best; advantage inadvertent lateral deviation of the cutting blade l during its subsequent cutting operation causes4 the blade to again cut the rubber block and consequently produces thin rubber ribbons. When the cutting `bladesA again encounter these ribbons they tend. to either clog the slots or to draw inwardly the `side walls of these Aslots and thereby cause the cutting blades to cut additional ribbons..A However, bypre-forming relatively narrowslots in the cutting rubber and limiting their width to Vpermit only :minute lateral movement of the cuttingblades, then in all subsequent cutting operations of the blades they are guided intov the slots without.cutting ribbons from their side walls. It has also been .determined that in cutting blocks to'be yemployed with the type of folder disclosedin my co-pending application Serial No. 492,990, it'is necessary that the central rib defined b-y the spaced slots receive as much support aspossiblen Therefore, itis an object of this invention to `provide relatively narrow pre-formed slots in the cutting blocks and the bottom of these slots incline'd upwardly towards the center of each block'to' form an apex, thereby imparting or lending maximum support to` the outer surfaces of the cutting rubber. It is possible to employ the inclined bottom Walls for the slots because the co-actihg cutting blades have their cutting edges, inclined, Yas set forth in my application hereinbefore referred to`,`and attention is directedl to the fact that the bottom Walls may be inclined upwardly from the center and towards the terminals ofthe blockwithgood result, land without expensive in construction, aswell as practical,

serviceable and'eilcient in its use. l

' With the foregoingand other objects in View, which Awill appear as the description proceeds,.the invention" 'resides in the combination and .arn rangementiof parts, and inthe detailsof ,construction hereinafter described and claimed, :it being understood that'fvarious changes in the precise embodiment of the invention herein disclosedimaylbc made 'withinthe scope of what is claimed without departing from the spirit of the invention.

The invention has been illustrated in its preferred embodiments in the accompanying drawing, wherein:

Figure l is a fragmental sectional view cut radially through the folding and collecting cylinder of a printing machine folder, showing the improved cutting block and holder applied thereto,

Figure 2 is a fragmental end elevation, parts in section, of the folding and collecting cylinder and cooperating cutting blade support,

Figure 3 is a fragmental side elevation of the improved cutting block,

Figure 4 is a fragmental plan view thereof,

Figure 5 is an end elevation of the cutting block and holder Viewed from the line 5-5 of Figure l, and

Figures 6, '7 and 8 are transverse sections taken through the improved cutting block and holder and taken respectively on the lines 6 6, 1-1, and 8 8 of Figure l.

Referring to the drawing, in which similar reference characters designate corresponding parts, there is shown a portion of a folding and collectingv cylinder I0 and the cooperating cutting blade holder II which is operably mounted on the cutting cylinder, as disclosed in my copending application, Serial No. 492,990. The folding cylinder may have any desired number of cutting block holders I2 secured thereto and in the present instance three blocks are employed and two cutting blades I3 are operably supported by the cutting cylinder, not shown, Each cutting blade is secured between cheek blocks I4 and these cheek blocks are yieldingly held in projected position by means of helical springs I5. It will be understood that one cutting blade is operably positioned aroundthe cutting cylinder at a point a little less than 180 behind the other cutting blade. l

Each cutting block holder is in the form of an elongated trough, which is received within the usual recess formed in the cylinder I0, and is provided with a bottom member 20 and spaced side walls 2I. A filler member or block 22 is positioned at each longitudinal terminal of the cutting block holder and is suitably secured to the t bottom 2U and side walls 2| of the holder thereby producing a rectangular receptacle for the reception of the cutting block. A screw or other suitable securing device 23 extends through each block 22 and into the folding and collecting cylinder I0 thereby rigidly securing the cutting block holder I2 to this cylinder.

The cutting block 25 herein illustrated is in the form of an elongated strip of resilient material such as rubber, or substance of like characteristics, and being rectangular in cross-section. Any suitable means may be resorted to for securing the cutting block within its holder and in the present instance a plurality of corneal recesses 26 are formed in the opposite sides of the cutting blockfor the reception of securing screws 2.1 which are threaded through the side walls 2| of the cutting block holder and have pointed ends which project' into the recess 26 thereby locking the cutting block or rubber within its holder.

In carrying out this invention each cutting block or rubber 25 has spaced longitudinally-extending slots` 30 formed therein, thereby defining a central rib 29. These slots may be moulded when the cutting block 25 is being formed or they may be otherwise pre-formed therein, as by .cut-

ting or milling after the formation oi' the block but before this cutting block is put in normal cutting operation. Each pre-formed slot is relatively narrow but has perceptible width and, in the present instance, the bottom portion of the slot is defined by an inclined wall 3| which is inclined upwardly from the terminal portions of the cutting block or rubber to form an apex 32 at the central portion of the slot thereby shaping the bottom of the slot to conform to the tapered edges I6 of the serrated cutting blade I3.

In the operation of a cutting mechanism of this type, the edges I6 of the cutting blades I3 project relatively deep into the slots 30, and any inadvertent lateral deviation of the blade I3 which may be caused by manufacturing inaccuracies or wear of the operating components of the device, causes the cutting blades to cut thin ribbons from the side walls of the slots 30 if the width of these slots are not in excess of the minute lateral dimension of the cutting edge of the cutting blade. On the other hand, if the cutting slots 30 are formed withr excessive widths improper cooperation between the cutting blade and block results and consequently ragged edges are cut in the product.

In order that the cutting blade and cutting block may properly cooperate to the best advantage', the slots 30 are pre-formed with perceptible Width, but this width is less than the thickness of the cutting blade, and maximum rigidity is imparted to the rib 29 by inclining the bottom walls of these slots 30 thereby giving the advantage of relatively shallow slot portions. As the cutting blades I3 move radially into the slots 30 the side walls of the slots engage the tapered portion of the cutting blade thereby causing this blade to positively sever the product and produce neat cut edges thereon.

' Having thus described my invention, I claim:-

1. A cutting block for use in printing machine folders, comprising a body member having a slot of perceptible width pre-formed therein, the slot extending longitudinally of the block and having its bottom wall inclined upwardly towards the center of the Vbody member.

2. A Vcutting block for use in printing machine folders, comprising a resilient body member having a slot of perceptible width pre-formed therein, the slot extending longitudinally of the block and having its bottom wall inclined upwardly towards the center of the body member.

3. A cutting block for use in printing machine folders, comprising a body member having a slot of perceptible width pre-formed therein, the slot extendlnglongltudinally of the body member and having its bottom wall inclined upwardly to form an apex at the central portion of the block.

4. A cutting block for use in printing machine folders, comprising a resilient body member having a slot of perceptible width pre-formed therein, the slot extending longitudinally of the body member and having its bottom wall inclined upwardly to form an apex at the central portion of the block.

5. A cutting block for use in printing machine folders, comprising a body member vhaving a longitudinally-extending slot pre-formed therein, the slot being formed relatively deep at the opposed terminals of the body member and rela'- tively shallow-at the central portion of the body member.

6. Acutting block for use in printing machine folders, comprising a resilient body member having a longitudinally-extending slot pre-formed therein, the slot being formed relatively deep at the opposed terminals of the body member and relatively shallow at the central portion of the body member. f

'7. A cutting block for use in printing machine folders, comprising a body member having a slot of perceptible Width pre-formed therein, the slot having an inclined bottom wall defining the slot so that a portion of it is relatively deep and a portion relatively shallow.

8. A cutting block for use inprinting machine folders, comprising a resilient body member having a slot of perceptiblewidth pre-formed therein, the slot having an inclined bottom wall dening the slot so that a portion of it is relatively deep and a portion relatively shallow.

9. A cutting block for use in printing machine folders, comprising a body member having longitudinally-extending spaced slots formed therein, a rib defined by the spaced slots, portions of the slots being relatively deep and portions relatively shallow.

10. A cutting block for use in printing machine folders, comprising a resilient body member having longitudinally-extending spaced slots formed therein, a rib defined by the Vspaced slots, portions of the slots being relatively deep and portions relatively shallow. v

11. A cutting block for use in printing machine folders, comprising a body member having spaced longitudinally-extending slots formed therein, a longitudinally-extending rib dened by the slots, the slots and rib being relatively deep at portions of the body member and relatively shallow at other portions of the said body member.

12. A cutting block for use in printing machine folders, comprising a resilient body member having spaced longitudinally-extending slots formed therein, a longitudinally-extending rib defined by the slots, the slots and rib being relatively deep at portions of the body member and relatively shallow at other portions of the said body member.

13.` In a cutting mechanism for printing machine folders, the combination of a folding cylinder, a cutting blocksecured to the folding cylinder and having a longitudinally-extending slot pre-formed therein, a cutting blade supported to operably cooperate with the cutting block and having its cutting edge inclined, the bottom Wall of the said slot being inclined to substantially conform to the inclined cutting edge of the cutting blade.

14. In a cutting mechanism for printing machine folders, the combination of a vfolding cylinder, cutting blocks secured to the folding cylinder and each block having spaced longitudinally-extending slots formed therein, a longitudinally-extending rib dened in the body member by the said slots, cutting blades operably supported to cooperate with the cutting blocks, each blade having its cutting edge inclined, the bottomwall of the slots formed in the cutting block being inclined to substantially conform to the cutting edge of the cutting blade.

15. In a cutting mechanism for printing machine folders, the combination of a folding cylinder, cutting blocks secured to the folding cylinder and each cutting block having spaced longitudinally-extending slots formed therein, a rib defined by the said slots, cutting blades operably supported to cooperate with the cutting blocks and having their cutting edges inclined so that the terminal portions of each blade projects be-V yond its central portion, the bottom walls of the slots formed in the cutting block being inclined to substantially conform to the cutting edges of the cutting blades.

16. In a cutting mechanism for printing machinefolders, the combination with a cylinder, a cutting blade coacting with the cylinder and operable with a relatively great radial movement with respect to the cylinder, of a resilient onepiece cutting block secured to the cylinder and having a relatively deep radially disposed longitudinally extending slot preformed therein for the operable reception of the cutting blade, the Width of the slot being less than the thickness ofthe cutting blade and not less than one-half its thickness.`

JOHN R. TOMLIN.

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