US1913304A

US1913304A - Paper cutting and trimming machine and safety mechanism therefor

Info

Publication number: US1913304A
Application number: US523590A
Authority: US
Inventors: Edward M Brackett; Daneke Dietrich
Original assignee: Brackett Stripping Machine Co Inc
Current assignee: Brackett Stripping Machine Co Inc
Priority date: 1928-04-30
Filing date: 1931-04-08
Publication date: 1933-06-06
Anticipated expiration: 1950-06-06

Description

June 6, 1933. E. M. BRAcKr-:TT Er AL 1,913,304

PAPER CUTTING AND TRIMMI-NG MACHINE AND SAFETY MECHANISM THEREFOR Original Filec April 30. 1928 4 Sheets-Sheet 1 June `6, 1933.

E` M. BRACKETT ET AL PAPER CUTTING AND TRIMMING MACHINE ANDSAFETY MECHANISM THEREFOR Original Filed April 30, 1928 www i# 4 Sheets-Sheet 2 4 Sheets-Sheet 3 qu l PAPER CUTTING AND TNINMING MACHINE AND SAFETY NEcH'ANrsN THERENON original Filed April so. 19223 June 6, 1933.

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l.June 6, 1933. E. M. BRACKET-r ET-AL 1,913,304

PAPER CUTTING AND TRIMMING MACHINE .AND SAFETY MECTHAKNIYSM THEREFOR original Filed April so, 192s 4 sheetssheet 4 Patented June 6, 1933 *f UNITED STATES PTENTOFFICE- :erwan-nir. BRACKETT `AND Din'rnci nANnin, oF TCPEKA, KAivsAs, AssiGNoRs To min BRACKEHT sra-infine MACHINE COMPANY, or TOPEKA, KANsAs, A ComAn'r-` irnnsriir `er anwenngn. nnAcKnrfrANn renin ivi.. BRAcKE'rT Penna CUTTING Ann friuiviiaine ivrACrrINE AND sArn'rY MECHANISMTHEREFOR Grgiiial application filed April 30, 1928, Serial No. this application filed April @This invention relates to paper cutting and trimming machines and safety mechanism therefor.

The principal object of the invention is to provide an improved paper cutting or trimming machine having a casing or housing provided with doors and adapted to enclose a knife and knife-operating `and paperclamping mechanism, with improved` safety mechanism operatively connected with or forming a part of an improved clutch-actuating and releasing mechanism for controlling the operations or starting and stopping tbe machine; and more particularly to pro- ""l videin a paper-cutting and trimming machine an improved safety device connected `tion will appear from the following descriptions and claims and from an examination of the accompanying drawings which aremade a part hereof.

The invention consists of the features, combinations, details of construction and ar- 1angement `and mode of operation of *the parts as herein described and claimed.

This application is a division of a pend- 'ling application of the above-named Edward M. Braclrett and Dietrich Daneke, Serial No. 273.967, filed April 30, 1928, for Iniprovements in paper cutting and trimming machines and gageland gage-stop, carrier, hold-` down 4and safety mechanism therefor, to which reference is made herein. f i l In the accompanying drawings i Figure l is a view in side elevation `of a ff' paper cutting and trimming machine with part of the side frame broken vaway and showing our improved safety tripping mechanism i Fig. 2 is a detail view taken on line33 of Fig. 3, looking downward, and showing 273,96*?, and in Canada July 30, `1980. Divided and snaai. semi No. 523,590.

the main clutch nism; i i

Fig. 3 is a `detail view in elevation show-` ing the safety tripping mechanism shown in Fig. l; i i

Fig. fi is an enlarged detail view partly in horizontal section taken on line 4 4 of Fig. 3looking downward, and showing a top plan and safety tripping mecha` view of the safety.` tripping` mechanism l shown in Figs.` 1 and 2;

Fig. 5 is a view `partly in vertical section i taken on line 5-5 ofFig. 4, and showing the safety tripping mechanism shown in said Fig. l` in front elevation;

Fig. 6 is an enlargeddetail View in verti- 11;

cal section takenon line 66 of Fig.` 3 and showing` a modiiied form of theinvent-ion and Fig. 7

would appear whenviewed from the right of said `figure.` I i In constructing an improved `cutting and trimming `machine provided with improved.

safety and clutch actuating mechanism constructcd and adapted to operate inaccord ance with this invention, a main frame l is provided having a pair of upright l nifesupporting and clamp-supporting

side frame members

2, 2 which project upward on opposite sides of a feed table or bed 3, which is upon and forms a part of the main frame.

Suitable knife-operating` mechanism is provided, which may be of any desired ordinary and well-known or suitable form, and l.

which, in the `forni ofthe device shown in the,` accompanying drawings, comprises a knife-operating crank shaft 7, which is rotatively` mounted in suitable lower side frame portions 8 of the machine frame.` The crank shaft 7` is operatively connected with is a front view in elevation of the mechanismV shown in Fig. 6 as the same a suitable source of power, suoli, for eXam- Y ple, asian` electric motor, by suitable shaft and gear mechanism which,\by preference,

includes a spur gear wheel 9` fixed to the' crank shaft `7 and operatively connected with a. motor-driven shaftlO by ineansof a toothed gear wheel 11 on and `rotative with the shaft 10and in toothed engagement with said wheel 9. `i. The shaft 10 is connected lwith the motor or source of powernot shownby suitable gears including a gear wheel 12 on the shaft 10 and suitable gear and clutch mechanism which may be of any ordinary and well-known or suitable form adapted to enable the

shaft

10 or 7 to be connected with and disconnected from the motor or source of power, such, for example, as gear 13 on motor shaft-10. (See Fig.r3.)

Upright connecting rods or pitmen 22 located on opposite sides of the machine are connected with the knife and with crank arms 24 fixed to the opposite ends of the crank shaft 7 and rotative with said shaft. (See Figs. 1 and 2,) l

In constructing a safety tripping mechanism in accordance with this invention, and equipping a cutting or trimming machine therewith, a suitable clutch 200 is provided and operatively connected, by preference, with the crank shaft 7, for ope-rating the knife, and with the gear mechanism by means of which the crank shaft is connected with the motor or source of power.

The clutch may be of any ordinary and well-known or suitable form, but is by preference of substantially the same 'form and construction as that shown in Figs. 7, 8 and 9 of the original application, Serial No. 273,- 967 of which this is a divisional application and comprises an outer clutch member 201, an inner clutch member 202, and an intermediate clutch member or roller cage 203 which is interposed between said inner and outer clutch members and serves to hold the usual series of rollers 204 in spaced apart relation in the annular race-way 204 formed by said hollowed out annular' outer clutch member, said rollers being mounted in position to engage and cause the inner and outer clutch members to be held in fixed relation to each other when the clutch is engaged., and to release and permit the outer clutch member and the gear'9 to rotate freely while the crank shaft 7 is held stationary, when the clutch is disengaged. The inner clutch member 202 and intermediate clutch member or roller-engaging and releasing cage 203 are yieldingly connected in the usual manner by means of the usual compression spring interposed between spring-pressed shoulders 101 and 102 on said inner and intermediate clutch members respectively. As such clutches are well-known and in common use it is believed to be iinnecessary to further describe or illustrate the same in detail herein.

The outer clutch member 201 is iiXed to the gear wheel 9 which is' free to rotate relatively to the driving crank shaft 7 when the clutch is disengaged and the crank-shaft is stationary. The inner Vclutch member 202 is fiXed to said crank shaft 7 and provided with an outwardly projecting tripping finger or detent 205, which is adapted to be engaged outside of the adjacent side margin of the "5- front door 207 which is hinged to one of the upright side frame members 2 and located in front of the knife-enclosing casing or housing, forenclosing the knife and clamp mechanism within the space between the up- "i

right'side frames

2, 2 and the front door 207 and back door 208. (See Fig. 5).

A clutch-operating hand lever or trip-ping lever 209 is attached to and adapted to swing in a horizontal plane upon the vertical axis formed by said upright clutch-operating shaft or rod 206. Said operating lever is located by preference above the front feed table 3, and is adapted to normally extend horizontally in front of the knife enclosing housing 4 and in front of the closed front door 207 on said housing. T he said lever is by preference hinged to the upright rod by means of a hinge member or head 210 fixed to said rod and having hinged engagement with the lever 209 which is connected with the said hinge member by a transversev horizontal hinge pin 103, whereby the lever is permitted to swing from its normal liorizontal lowered operative position in front of the knife-enclosing door, to upright raised position adjacent to the upright rod 20G and at one side of the door, to permit the door to be opened when required. The upright clutchoperating rod 206 is operatively connected with the clutch mechanism on the crank shaft 7, by suitable means which is by preference constructed as follows:

A clutch-operating or tripping and releasing pawl 211 is pivotally mounted on a supporting stub sh aft or pin 212 mounted on or fixed to the side frame 213, or other suitable strong and rigid support. Said pawl is located in position to engage and stop and release the tripping finger or detent 205 on the clutch 200 above described. rlflie pawl is provided with means for yieldingly holding` it in clutch-releasing position, said means consisting of a compression spring 214- mounted on a supporting rod 215, one end of which is supported by a bracket or supporting clip 216 attached to the side frame 213 or other suitable support by securing screws or bolts 101i: and provided with an end opening or recess 105 therein into which the end of the rod extends. The opposite end of the spring-supporting rod 215 extends loosely into a socket or recess 218 in the pawl and is provided with a` loose collar 219 between the end of the spring and said pawl. A coliar 217 encircles the end of the `spring-,sup-

porting rod near the recessed end of the said e prises a `headed spring-pressed bolt `222 mounted in a recess in the shoulder 221 of the pawl 211 between flanges or side plates` 223. Said bolt 222 is flexibly or pivotally supported upon said pawl and inposition to extend between the shoulders on the clutch andpawl respectively, by means of a pivot `pin 224 anchored in the said flanges or spaced plates 223 on said pawl and extending through a suitable opening in the rod orbar 222. A compression spring 225 is seated in a recess inthe pawl and in engagement withv a recessed portion of said headed boltor bar 222. Manually operable means is provided-for actuating the clutch-releasing and stopping pawl 211, one form of which is shown in Figs. l to 5 inclusive, and another form of which is shown in Figs. 6 and.;

\ A pawl-actuating memberconsisting of a longitudinally movable bar 226 `having aurecessed portion form-ing a pawl-engaging hook or shoulder 227 adapted to releasably engage a pin 228 fixed to the lever arm 229 of the pawl 211,-is pivotally` connected at one end `with a depending'pawl-actuating lever 230 by means of a bolt-231, the upper end of said leverbeing `pivotally connected with the side frame2l3 or similar support,

by a bolt 232. The lever 230 is `thus adapted to swing upon the axis formed by said bolt 232. The oscillations or swinging movements of the lever `230 are limited and the lever is guided and held in operative posi- 5 tion by a `guide 233 which is secured to the machine frame by bolts 234 located on opposite sides of said lever `and eXtendin through suitable openings in said guide. longitudinally movable reciprocatory plung- 'j er 235-is slidably supported by a similar guide 236 secured to the machine frame by bolts 237 located respectively `on opposite sides of or above and below said plunger; and said plunger is flexibly connected at one if' end with the depending lever 230 by a connecting pivot pin 230. A tension spring238 1'-s connected at one end withthe stationary guide or strap .236 and at its opposite end with said depending lever 230 and tends to yieldingly hold said depending lever and plunger and thepawl-engaging and actuating rod 226 in normal or initial position and to permit the pawl 211 to engage the tripping finger or clutch shoulder 205 of the clutch 200 in clutch disengaging or releasing positionandhold .the engaged clutch member and the crank shaft 7` against rotation until the pawl 211 is operated or withdrawnfrom engagement with the clutch to permitthe operation of the crank `shaft and i" knife. (SeeFig. le). i, l N

`1/3i1stop239 engages and limitsthe movement of the pawl 211 toward the clutch;

and a projecting peripheral tripping finger 240 onthe inner `clutch member 202 serves Y toV engage and `raise the pawl-actuating bar 226 out of engagement with the pin 228 on the pawl 211 thus permitting the .pawl to be f returned bythe spring 214 to clutch releasing or knife-stopping position to release the connection between Ithe driving crank shaft 7 and the source of power. e i The upright clutch-operating shaft or rod 206 is operatively connected with the plunger 235 byvmeans of a plunger-engaging crank arm 241 `fixed tothe lower extremity of said upright shaft or rod 206 and adapted to extend through an opening 242 in the machine frame 213 and into engagement with the end of said plunger 235,.` `(See Figs. 1 and2); A pair of-stop arms 243 `which may be mounted on or integral with the crank arm 241 on said upright shaft or rod are located on the outside ofthe machine frame and attached to the lower extremity of said upright `shaft or rod. Said stop arms 243 are provided with setscrews 244 in threaded engagement with and adjusted relatively to said stop arms, and adapted to alternately engage the adjacentside frame 213, for stopping and limiting the turning movements of the upright clutch-operating shaft 206 and the clutch-actuating hand lever 209 as the latter is operated to set or release the clutch. Saidstop arms also serve to prevent injury to the clutch-operating mechanism.

`Safety locking mechanism is provided for holdingthe upright clutch-operating shaft 206 and operating lever 209 and the clutchactuating mechanism connected therewith, in normal n clutch-releasing position, or in position to prevent the accidental or inadvertent operation of the knife or other parts of the machine, or the premature or accidental connection of the driving mechanism with the source of power and especially when either of the doors 207 `and 208 are open,.or when the machine is not in all respects in condition for operation with safety to the machine and to the operator, and for releasing and permitting the operation ofsaid lever 209 when the doors 207 and S are closed and not otherwise;

ot pin or bolt 248 anchored in the top of the machine frame and comprises a lever arm 249 located adjacent to and adapted to be moved into and out of locking engagemr-int with the notched and shouldered end of the locking crank arm or lever 245. The other arm 250 of said bell crank is operatively connected with a pair of telescoping springpressed bolts or

plungers

251, 252, one of which is tubular or hollowed out and the other of which has a reduced stem portion 253 mounted within and in telescoping sliding engagement with the tubular member 251. A compression spring 254 is seated in the tubular member 251 and in engagement with the inner end of the inner telescoping member 252, and tends to press said telescoping members apart endwise. The outer ends of the telescoping-spring-pressed plungers are thus pressed outward beyond the outer door-engaging faces of the upper frame portion 255 when the doors are open, and are in position to be pressed inward by the inner faces of the doors to retracted position when the doors are closed.

A pair of bell cranks 256 mounted upon and kadapted to oscillate upon the vertical axes formed by upright supporting bolts or pivots 25,7, 257, anchored in the top frame portion 258 of the machine,each have one lever arm 259 connected with and adapted to be operated by the adjacent one of said telescoping spring-pressed

plungers

251, 252. Said lever arms 259 are flexibly connected by means of a tension spring 260 which tends to draw them together and also tends to draw the

plungers

251 and 252 inward against the tension of the spring 254, but Without overcomino' the tension of the latter spring which is stronger than the spring 260. The

other lever arms

261, 261 of said bell cranks are each connected with the arm 250 of the bell crank 247 by means of a connecting link or plunger 262, one end ofwhich is connected with the bell crank 247, by a pivot pin or bolt 263, and the other end of which is connected with both of Ysaid arms 261 by pins 264 which are anchored in the link or plunger 262 and extend into end notches or recesses 265 in the lever arms 261 respectively. The lever arm 249 of the bell crank 247 is therefore movable automatically into locking engagement with the lever 245 fixed to the upright clutch-actuating shaft 206 so as to lock the said shaft against rotation or operation when one or both of the

doorsl

207 and 208 are open. The closing of both of said doors will operate and lock the said-lever 247 out of locking engagement with saidr lever 245 and release the latter and the manually operable clutch-actuating and releasing shaft 206 and hand' lever 209, which may then be operated to set or release the power clutch i as idesired.

In the form of clutch-actuating and releasing safety mechanism shown in Figs. 6 and 7, the means for operatively connecting the clutch-engaging and releasing pawl 211 with the manually operable vertical rockshaft 206 and hand lever 209 comprises a horizontal reciprocating plunger 106 which is employed inlieu of the plunger 226 already described and best shown in Fig. `1. The said plunger 106 is slidably mounted at one' end upon a supporting stud 107 which is anchored in and projects inward from the inner face of a supporting boss 108 which forms an integral part of the machine frame 213. Said stud extends through an elongated slot 109 in said plunger for permitting the required movement of the latter endwise. The said plunger 106 is provided with a bottom notch or recess 110 and a bottom shoulder 111 which corresponds with the shoulder 227 on the plunger 226 already described and is adapted to engage and alternately lock and release the projecting pin or shoulder 228l on the arm 229 of the pawl 211 already described. Y

An upright plunger-supporting and actuating bar 112 is pivotally mounted at its lower end upon an oscillating horizontal lever 113 by means of a connecting pivot pin 114 which extends through suitable openings in the overlapping ends of said connected parts. The upper end of said upright bar 112 is pivotally connected with the plunger 106 by a horizontal connecting pivot pin 115.

Said oscillating lever 113 which supports l the upright bar 112 is pivotally supported upon the machine frame by a stationary stud or bolt 116 anchored in the machine frame and extending through a suitable opening in said lever. The forwardly projecting lever arm 117 of said lever 113 extends under the power-clutch 200 and into the path of movement of a peripheral tripping shoulder 118 which projects outward from and may be formed integrally with the peripheral poril tion o f bthe Vinner clutch member or cam 202 in position to engage the lever arm 117 and automatically actuate said 'lever 113 and upright bar 112 and thereby raise the recipro- Y eating locking and releasing plunger106 with its hook or shoulder 111 out of engagement with the stud 228 on said pawl 211, thus permitting the. released pawl to be returned to its initial normal position in the path of movement of the peripheral shoulders 118 and 205 on the inner clutch member or cam 202 and intermediate clutch member or roller cage 203 to release the clutch and thereby release the driving shaft 7 from the -a continuously rotative gear wheel 9 to which the outer clutch member 201`is fixed, thus effecting the automatic release of the connection between said gear and the intermittently rotative crank shaft 7 and knife and clamprevolution of the clutch 200. l

` to its initial normal-position as shown in Fig. 6. The said compression spring 120 is by preference mounted vupon a rod 121,`0ne end of which is connected withsaid upwardlyprojecting shoulder' 119 on the plunger 106 by means-of an angular connecting inember orflanged head"122 fixed to said rod and t secured to said supporting shoulderlby a bolt 123 or other suitable tsecuringfmeans." The oppositeend ofsaid spring `120 and its sup` porting rod aresupported upon an angular bracket 124 having a perforated endflange 125 through and in sliding engagement with which said spring-supporting rod extends. Said compression spring 120 islthus adapted to automatically return the clutch-actuating bar 106 to its initial position after each movement of said clutch-actuating andreleasing bar in the operation of releasing the pawl 211 fromengagement with the rotative shoul* dered' clutch members ofthe power-clutch Means is provided for operatively connecting. the clutchactuating fandjreleasing plunger 106 with `the manually operable up`` right rock shaft 206 andhandlever209, and comprises by preference an upper locking `lever 126 rockingly mountedfupon a supporting bolt or stud-127 anchored in thema` chine frame, a lower yrocking lever 128 rockingly mounted upon a"horizontal stud129` fixed tothevmachine frame and a connect-l ing link 130 having one t end connectedfwith the lower arm of said `upper lever 126 by a connecting bolt or `pin 131, thelopposite end of said linlbeing connected with the upper end of said lower lever 128 by a`connecting` pin 132.` n l.

The lower depending arm 133 of said rocky ing lever 128 extends downward between the pawl l211 and the shoulder 1.19 o-n theclutchactuating and releasing plunger 106 and in position "to operatively engage and actuate said plunger` and :pawl inwone direction against the tension ofthe spring 120 `to release said pawl from engagement with the shouldered "clutch members ifithe clutch 202 to set the clutch when the clutch-actuating hand lever209 and upright shaft 206are operated in oneI1 direction, saidconnected levers and" clutchLactuating and `releasing plunger being adaptedtofbe automatically above described returned to their initial normal position by the action of the compression spring 120. y

y VA lever arm 134`is iixed to `thelower extremity of the uprightmanually operable clutch-actuating and releasing shaft 206 on which the hand lever 209 is mounted, as al# ready described. ,L The bottom end of said upright shaft `206 is journaled inasuitable bearing 135 on the outsideof `thefmachine frame; andlsaid lever arm 134 extends inward through the opening 136 in the machine frame and into positionto engage the upper end ofthe lever 126 andoperate and release said lever and thereby the clutch mechanism when the hand `lever is operated. y f

QLaterally"projecting stop arms 137 are fixed to `and extend outwardly in opposite directions" from `the lower extremity of the manually operable `clutchactuating andreleasing rock shaft 206,` and are provided with threaded adjustingscrews 133 mounted in threaded openings in said stop arms and adapted to alternately engage the adjacent outer face ofthe machineframefor stoppingand limiting the rotative or rocking movements of said upright shaft 206 in oppo site directions alternately.

`The` -clutchstopping and `releasing pawl 211" shown in Figs. 6 and 7, is provided `with a headed shock-absorbing plunger 139, which ismounted in a cylindrical bore 140` in said pawl and inposition to engage and release the shoulders 118 and 205 on the powerclutch `202 in lieu of the hinged member 222, shown in Fig. 1. i i

-`The"`plunger 139 is provided with a longitudinal axial bore 141in which is mounted a compression`spring`1142 which is interposed between theend of said bore and the adjacent" end of thesoclret or bore in the paw] invwhich said plunger is mounted. circumferential annular "groove 143 is formed in theperiphery ofthe plunger and is adapted to provide an annular oil containing space which entirelyencircles the plunger. And a restricted connecting oil passage 144 extends from the bottom of said annular groove or oil containing space inwardlyto the annular bore 141 `inthe plunger and in whichthe spring 142 is contained'. An oil reservoir 145 is provided in the pawl211 havinga con necting passage 146leading from said oil reservoir or supply chamber 145 into said annular oil containing space`143 which surrounds said plunger as already described. A `flexible tube 147` is secured at its bottom end to the pawl 211 by a nipple 148, or other suitable" securing means and forms an oil supply conduit which leads into an `inner passage 149 within the pawl and is adapted toform `a connecting oil supply passage between said tube 147 and said inneroil Supply're'servoir or chamber 145 in said pawl.

1 The restricted passage 144 is adapted to permit and resist the flow of oil from the reservoir or supply chamber 145 into andiout of the annular bore 141 in the plunger 139. The oil thus forced into and out of said axial boreand the space between the plunger and the bottom of the socket or bore in which the plunger is mounted serves to permit and yieldingly resist the invvard movement of the plunger when it is engaged by the stop shoulder on the power clutch 202 thus affording a simple and efficient shock absorber for minimizing the shocks caused by the stopping of the rotation of the shouldered clutch members as the rotation of the clutch is stopped by the pavvl and plunger. A transverse plunger retaining pin 150 is anchored at its opposite ends in a transverse opening in the pavvl 211 and seated in and in sliding engagement With a shouldered peripheral notch in the plunger for holding the plunger in place and permitting and limiting the longitudinal movements of the plunger.

IVe claim:

1. In a cutting machine having a movable knife, the combination of knife-operating means comprising gear and clutch mechanism adapted for operative connection With the knife, means for enclosing and shielding the Vknife and knife-operating mechanism, said shielding means comprising a movable closure member, tripping mech-anism operatively connected With the clutch mechanism, and locking means operatively connected with said tripping mechanism and adapted to be engaged and released by the action of said movable closure member, for locking the tripping mechanism against rotation When the shielding means is unclosed.

2. In a cutting machine having a movable knife, the combination of knife-operating means comprising gear and clutch mechanism adapted to be voperatively connected with the knife, means for enclosing vand shielding the knife and knife-operating means, tripping mechanism operatively connected with the clutchV mechanism and comprising a rock shaft located adjacent to said enclosing and shielding means, and lockingl means associated With and adapted to be operated by said shielding means and operatively connected With said rock shaft, for locking the tripping mechanism against operation when the shielding means is unclosed.

3. In a cutting machine having a movable knife, the combination of knife operating means comprising gear and clutch mechanism adapted for operative connection With the knife, tripping mechanism operatively connected with the clutch mechanism, said tripping mechanism comprising a pawl mount-ed adjacent to and movable into and out of engagement with the clutch mechaism, reciprocatory plunger mechanism operatively connected With said pavvl, a rock shaft provided With a crank arm adapted for operative engagement With said Vplunger for moving the same in one direction to release the clutch mechanism, means for operating the plunger in an opposite direction to stop the clutch mechanism, and means for operati-ng the rock shaft.

Ina cutting machine having a movable knife, the combination of knife-operating means comprising gear and clutch mechanism adapted for operative connection With the knife, means for enclosing and shielding the knife and knife-operating means, tripping mechanism operatively connected With the clutch mechanism and comprising a rock shaft located adjacent to said enclosing and shielding means, an operating lever connected With said rock shaft, a pawl movable into and out of engagement With the clutch mechanism, paWl operating means connected with said paWl and operatively connected With and adaptedy for operation by said rock sha-ft for releasing the clutch mechanism, and locking means associated with and adapted for operation by said shielding means for locking the tripping mechanism.

5. In a cutting machine including a movable knife, the combinationrof knife-operating means comprising gear and clutch mechanism adapted for operative connection with the knife, a paWl mounted adjacent to and movable into and out of engagement with the clutch mechanism for tripping and stopping the'same, reciprocatory plunger mechanism operatively connected With said pavvl, tripping lever mechanism adapted. to engage and operate said plunger mechanism in one direction to release the clutch mechanism, and means for operating said plunger mechanism in an opposite direction to permit the pawl to engage and stop the clutch mechanism.

6. In a cutting mechanism including a movable knife, the combination of knife-operating means comprising driving gear and clutch mechanism adapted for operative connection With the knife, means movable into and out of position for enclosing and shielding the knife and knife-operating means, tripping mechanism comprising a pawl adapted to engage and release the clutch mechanism, tripping lever and plunger mechanism operatively connected With said paw] for operating the same to release the clutch mechanism, locking lever mechanism movable into and out of locking engagement with said tripping lever mechanism, and means associated With and adapted for operation by said shielding means and connected With said locking lever mechanism, for operating the same, to lock the tripping lever mechanism to lock the tripping mechanism in clutch releasing position when the shielding means is out of shielding position.

7. In a device of the character decribed including a knife, means for operating the knife Ofi and a frame enclosing the knife including a movable door, means operable by the door to lock said knife-operating means out of func-` tional position including a spring-pressed bolt carried by the frame and normally restrained by the door, a bell crank lever operably connected with the plunger, a second bell crank lever connected with the first bell crank lever, and a link connecting said levers for moving the last named leverinto position for preventing operation of the kn1feoperat y ing means upon release of the plunger.

fi Si 8. In a device of Athe character described including a knife, means for loperating the knife including a movable rod, and a frame enclosing the knife `having a movable door, means operable by the doorto lock said knifeoperating means out of functional position including a spring-pressed bolt normally restrained by the door and releasable when the door is open, a bell crank lever operably connected With the plunger, a second bell crank lever, a link operably connecting the bell crank levers, and an arm fixed to the rod and engageable by the last named bell crank lever when the plunger is released to prevent move,

ment of said rod.

9. In a device of the character described i including a knife, means for operating the knife, a housing enclosing the knife having oppositely arranged doors movable into and out of position to expose the knife, means operable by the doors to lock said knife-oper i ating means out of functional position includy ing oppositely arranged plungers carried by tlie housing and engageable with the doors, a spring for urging the plungers against the doors, oppositely arranged bell cranks operably engaging the plungers, a third bell crank pivotally supported in the housing, a y

link connecting the first named bellcranks with the third named bell crank for moving the last named bell crank into position for preventing actuation of the knife-operatf' ing means When one of the doors is in open position.

Signed at Topeka, in the county of Shawnee and State of Kansas, this 4th day of April, 1931.

EDWARD M. BRAGKETT. DIETRICH DANEKE.