US2155396A - Flying shear - Google Patents

Description

A. BORZYM FLYING SHEAR April 25, 1939.

Filed Feb. 9, 1954 5 Sheets-Sheet 2 INVENTOR Wlexarzdernarzym t 9 ai SNEYS` f April 25, 1939. A. BORZYM 2,155,396

FLYING SHEAR Filed Feb. 9, 1934 3 Sheets-Sheet Z5 lNvENToR lrandef rzjim A T RNEY Patented Apr. 25, 1939 UNITED STATES FLYING suma Alexander Borzym, Detroit, Mich., assignor to The Yoder Company, Cleveland, Ohio, a corporation of Ohio Application February 9, 1934. Serial No. 710,430

zo claims.

'I'his invention relates to machine tools, and although particularly concerned with metal cutting devices of the class commonly termed flying shears, the principles thereof will be seen to be equally applicable to devices of many varieties for performing operations of various sorts upon different materials. An important object of the invention is the provision of an improved machine of the class indicated, especially suitable for operating upon extruded rolling or mill products, in the present instance to enable their severance into desired lengths, while in motion and without delaying their traveling movement.

Simplification of such devices and conservation of the space occupied, as well as reduction of both first cost and operating expense comprise further important objects.

Another object is the incorporation in such a machine of a novel carriage and cutter head assembly and improved supporting and operating means therefor of stronger and simpler design affording easier accessibility to Working parts and insuring more rapid and accurate action than those heretofore used.

A still further object is the provision in such a machine of novel latching and latch operating means, together with improved resetting means for the latch.

Still another object is the provisionof improved 30 controlling means for such machines.

Other objects and advantages will be apparent from the following description, wherein reference is made to the accompanying drawings illustrating preferred embodiments of my invention, and

35 wherein Figure 1 is a central vertical section of a machine incorporating the principles of this invention, taken substantially on the line I-I of Figure 2 and looking in the direction of the arrows;

Figure 2 is a front elevation of the machine.

Figure 3 is a rear elevation thereof.

Figure 4 is a top plan view thereof; and

Figure 5 is a detailed section taken substantially on the line 5-5 of Figure 2A and looking in the direction of the arrows.

Crankshaft mounting and driving springs Referring now to the drawings: l0 indicates as- 55 jecting extremities cranks 20--2I, which are arranged at a slight angle one `to another, so that when one is at its upper dead center the other is somewhat offset, for a purpose which will presently appear. The cranks are adapted to be acted upon by springs -26 arranged to apply power- 5 ful torque to the crankshaft to turn it through a partial revolution. One spring 26 is arranged below the crankshaft, and the .other 25 above it. Spring 26 is sheathed in a tube 29 and is connected to the crankshaft through connecting rod l0 28 and pitman 3l. The spring 26 is fitted over the connecting rod and arranged to act in compression by bearing downwardly against a spring l abutment 34 carried by the lower end of the rod, Y

and upwardly against a fixed abutment 35 car- 1l ried by the frame and serving to support the sheathing tube 29. The abutment 35 is provided with a clearance aperture undesignated) permitting lateral as well as slidable movement of the rod therein.

Spring 25, which acts cooperatively upon the other end of the crankshaft and tendsto turn it in the same direction, is housed in a tubular casing 39, the upper portion 39' of which extends above the spring and is internally tapped at its 25 upper end to receive a threaded bushing 4 I carrying an adjustable abutment plug 4l. At its lower end the spring 25 bears against and urges downwardly a piston-like thrust element 21, connected to crank 20 as by connecting rod 30. Element 2l 30 is reciprocable in the main supporting body of the spring housing 39, which body is shown integrally carried by bearing bracket I6'. As stated above, crank 20 is slightly offset in the direction of desired movement when the crank 2| is at its 35' upper dead center, and this is the normal positioning of these parts when the machine is cocked and before the commencement of the operating cycle. Resultantly, the spring 25 exerts a starting torque upon the crankshaft even though 40 the parts are at rest in the cocked position. The starting torque will be seen to be greater by-reason of the shown arrangement of the spring 25, in which it exerts thrust upon the connecting rod 30, than it would be if the spring acted in tension upon the rod. It will of course be obvious that other sources of or means of storing power might be substituted for the springs.

Carriage and cutter-head also. with further carriage. The cutter head is actuable through ried by the carriage lower extremity to the support 88, as by a pivot bolt .81, and at its upper end similarly pivotally attached lto the carriage by a bolt as 81. As a result of this construction the carriage is maintained horizontal despite its movability substantially in the line ofmovement of the work. The carriage is urged in the direction in which the work travels by -a spring- |88 carried by an arm |82 projectingflaterally and upwardly from the frame, and its movement is controlled by a blocking cam |85, the operation of.which will presently be'c'onsidered in greater detail. together, explanation of the carriage actuatingmeans.

vertically slidable in the carriage is a cutter head 88, which is movable up and down independently of the position' and movement of the connecting rods 82 articulated at their upper ends to a common cross pin 88 fixed in the head, and at their lower extremities to a throw 8l of crank shaft I8; which throw is disposed between the bearing brackets I1-I8.

It will thus be seen that despite the lateral movabllity of the carriage 40 made possible by its mounting upon the links 4243-44-48, the cutter head may at all times be reciprocated vertically by the crankshaft acting through connecting rods 82. 'I'he guide plates 88-88 car- 48 are fitted over and form gibs in which the side plates 84-81 of the cutter head are vertically slidable. Springs 28-28 tend to turn the crankshaft Il in such manner as to pull down the cutter head to do the work of cutting.

A cutter in the form of a punch 18 is carried by the head and adapted to be forced through the work by such downward movement of the head. A die 11 is carried by the anvil portion 18 and vertically apertured to receive the punch as well as provided with a longitudinal channel 19 through which the work may travel while being supported or "backed up by the die. The work, designated 4l, is shown as constituting a rolling mill product of channel form adapted to be fed through the die directly over the anvil or table portion 18 of the head. Pilot pins H0 project upwardly from the table andslidably interfitwith bushings lli carried by the head to guide the latter and maintain accurate alignment of the punch and die. AThe slugs punched from the work in severing it, fall through a slot I|2 in the table into a trough I i8 by means of which they may be conducted away from the machine or to a suitable receptacle (not shown).

Latching means To releasably hold the springs under compression, the cranks 2li-2i at their highest normal (starting) points, and the head at its starting point, and the parts cocked in such position, latch mechanism is provided comprising a lever 83 pivoted on the frame as at 88 at one yend, and at the other end pivoted to the pin 8l which also serves to couple the rod 28 and the pitman 8i. A nose portion 88 of the lever 88 projects beyond the pin to form a striker or retaining shoulder beneath which the latching dog 82 may engage to hold the rod 28 elevated, thus also maintaining the thrust element 21 elevated, both springs compressed, and the other portions of the apparatus in the positions shown with the cutter head in the elevated or starting position.

The latching dog 82 is formed as the upper arm of a bellcrank pivoted on the frame as upon bolt 81. The lower arm of the bellcrank, designated 88, is swingable by means of a solenoid 88 acting through a continuation 88 of its armature 88. As best appears in Figure 2, a portion 88' of the continuation 88 may overhang the bellcrank arm 88 to permit positive actuation of the latter upon downward movement of the armature. Energization of the solenoid tends to draw down the armature and thus swing the dog 82 from beneath the striker 88, freeing the latter and permitting the springs to rock the crankshaft and pull down the cutter head with a quick .and powerful stroke. A spring 1I urges the bellcrank toward latched position. acting to throw latter `is raised sumciently and the solenoid is deenergized. Spring 1I is fitted over a pull rod 18 pivotally connected to lower beilcrank arm 88 and bears upwardly against a stop nut 14 carried by the top of the rod and downwardly against a plate 82 which projects from the frame above the arm 88 and serves as an abutment also for a spring 12 which similarly but independently draws upwardly the armature 88 and connecting yelement 88 when the solenoid is deenergized.

The separate spring is provided to create clearance between the head 88' of connecting element 88 and the end of the bellcrank arm 88 upon which it acts when both are fully elevated. Such clearance. designated 88, permits the armature and connected parts to gather momentum before taking up the load, thus insuring more positive action and allowing use of a lighter solenoid. An adjustable stop 84, also carried by abutment plate 82, permits regulation of the rest positionlng of the dog and bellcrank. It will be seen that when the parts are in cocked position. energizing the solenoid trips the dog and allows the head to descend, and when the cranks are again raised to place the head in starting position the dog once more latches the machine in cocked position. v v

Cooking means Power for resetting the cutter head is supplied by the motor 15 mounted on a lower shelf 18 of the frame and connectible tothe crankshaft through gearing 11-18-19-88- 'I'he first mentioned gear pinion 11, is arranged upon the motor shaft, gears 18-18 are fast upon an idler shaft 8 I while the final gear 88 of the train is loose on the crankshaft i8 but connectible thereto by means ol?y a slidble toothed clutch element 88 splined on the shaft. Upon movement of the clutch element its teeth are engageable with and disengageable from a complementarily toothed face portion 88 fast upon the hub of gear 88. The clutch member 88 is shifted to fasten the gear to and release it from the crankshaft through the agency of a fixed roller 88 acting upon a cam 81 fast upon and rotatable with the clutch element 88, (which of course rotates with the crankshaft). Compression springs 88 trapped in suitable (undesignated) recesses in the clutch element 88 urge the latter 'toward engaged position, reacting directly against the body of the clutch at one extremity and at the other against thrust pins 9i projecting into the recesses and carried by a collar 82 fast upon the crankshaft. Cam 81 and roller 88 are proportioned so that when the latter is fixed in its normal operating position, the cam moves clutch element 85 into engagement with clutch element 86 as the crankshaft reaches the position it occupies upon completion of the actuation of the head 50 by the springs 25, 26. During operation of the Las machine the motor 15 runs constantly, so that the gear 80 is constantly driven. As a result of this arrangement, upon engagement of clutch 85-86,

v the motor takes up the drive and continues to turn the crankshaft in the same direction until the head again reaches the starting position shown in the drawings at which time the cam 81 again disengages the clutch 85, and the head is held in such position by the latching means previously described, which holds the crankshaft in the corresponding position by engagement of the latching dog 62 beneath the striker plate |50. The cycle is then of course ready to recommence.

In order to provide means for positively holding the clutch element 85. out of engagement with element 86 at desired-times, the roller 88 is mounted upon a swingable arm 90, pivotedon top of the frame as upon pivot bolt 93. The handle 95 by which the lever may be swung also controls a detent 96 which cooperates with recesses 91 into which lt is normally forced by a spring 98'to hold the arm and so the roller 88 in either of two positions, the detent being releasable from the recesses by pulling upon the handle to permit swinging the lever. One of the two posititons to which the lever is adapted to be moved is the operative position above described, in which rotation of the cam 81 acts to move clutch element 85 into and out of engagement with element 86, while when the handle is in the other position the roller 88 is so far from clutch portion 86 that the clutch element 85 cannot engage it, even vwhen the lowest portions of the cam are in engagement with the roller. By so temporarily preventing engagement of the clutch 85-86 upon starting the machine. the motor and driven parts may be allowed to gain full momentum before the load is applied to the motor, as a result of which a motor of less power may be used than would otherwise be possible, with resultant economy of first and 'operating costs.

A counterweight |20 is keyed tothe shaft |5 between the collar 92 and bearing bracket |1, and serves as a power storing device. In order to minimize the tendency of its inertia to Aresist quick starting of the crankshaft under the iniluence of the springs upon the commencement of a cutting stroke, the weight is so positioned that when the head is in starting position, as when the machine is cocked, the weight is elevated but spaced from its upper dead center, lying on the side thereof toward which it moves upon starting.

Carriage control It will be seen that the reciprocating and controlling means just described for the vertically slidable cutter head 50 do not interfere with lateral travel of the carriage 40 with the work. As previously stated, the entire carriage by which the cutter head is carried is urged in the direction in which the work travels by a spring I 00, trapped in an aperture 0| in the top of the upwardly extending arm |02 carried by the frame I0. The spring reacts against a plunger I 04 which in turn forces the carriage in the desired direction by direct engagement against an end thereof. Move-l ment of the carriage under the inuence of the spring |00 is controlled by the cam |05 mounted upon an arm |03 arranged similarly to the arm |02 andprojecting from the opposite side of the frame. The cam blocks movement of the carriage by reason of the engagement therewith of a roller |01 fastened to the carriage as by means of an arm |08.

It is of course obvious that only while the cutter or other tool is in engagement with the work is it necessary that the carriage travel therewith. The cam is accordingly so connected to the crankshaft as tobe driven thereby in one direction to permit the carriage to advance with the Work as the crankshaft turns through the Working portion of the stroke, that is, as the cutter head 50 moves downwardly from the starting position shown to the bottom of its stroke and again upwardly until clear of the work. The cam is of course so contoured as tov permit movement of the carriage at the desired rate, conforming to the rate of travel of the work. As stated above, and asshown in the drawings, the crank throw 5| is only slightly above horizontal when the cutter head is fully raised, and is accordingly positioned considerably in advance of the cranks 20, 2|. By virtue of this arrangement, the cutter head is moved downwardly to force the punch through the work'and then again upwardly to free the punch from the work as the cranks move downwardly under the influence of the springs -26. during which time the carriage continues to move forwardly with the work, as above stated.

'Ihe controlling cam |05 is driven by the crankshaft, being carried by a shaft ||5 journaled at one end in arm |03 and at the other in a cooperating bracket ||3. Beyond the latter bracket the adjacent end of theshaft projects, carrying crank ||6 which is connected to crank 20 by a link ||1.

Automatic control Carried by the arm |03 is a bed |20 which projects laterally from the machine, forming a support upon which is slidably mounted the base plate |2| of a control unit. The unit may be fixed in any of various positions along the bed by bolts |22 having head portions |22 slidably engaging a T-shaped slot in the bed, while a key |23 carried by the base 2| also engages in the slot to provide. an accurate pilot for the control unit, as best shown in Figure 5. A trigger plate |25 forming part of the control mechanism is carried by the unit in alignment with the path of travel of the Work 4|, and the control mechanism is so arranged that when plate |25 is impacted by the traveling work, and has been moved a predetermined distance thereby, the circuit to solenoid 65 is automatically closed to trip the shearing mechanism, in the manner previously described, and sever the Workwithout interrupting or interfering with the travel thereof.

The trigger plate |25 is carried by an arm |26 pivoted on the ends of and maintained in horizontal position by parallel cranks |21-|28. Crank |21 is fast upon a shaft |29 transversely journaled in an upstanding column |2| carried by the base |2 Carried lby the shaft and housed within the column is a slidable toothed clutch element which may be of similar construction to clutch 85 previously described, and keyed to the shaft as by the key |3| and by pins |32 carried by a collar |33 fast-upon the shaft and slidably projecting into the body of the clutch element. Springs |34 trapped in the apertures in the clutch body in which the pins are slidable, urge the clutch to the right as viewed in Figure 5, tending to force its toothed end |36 into engagement with a cooperating clutch element carried by and fast upon the hub of a worm gear |31. Gear |31 is normally loose upon shaft |29 and constantly driven by a worm |38 fast upon the driving shaft |39, to which is connected a motor v |4|. Fast upon the outside of the clutch body |30 is a cam ring |43 which in turning with the clutch body controllingly slides the same into and out of engagement with the clutch portion |35. Such sliding of the clutch is effected by erigagcment of the cam with a fixed pin |44 carried by the housing and projecting into engagement with one side of the cam. The cam is held in engagement with the pin by the springs |34 and is so designed that at desired angular positions the clutch is free to move far enough to the right under the influence of the springs to allow engagement of its portion |35 with clutch element |35, thereby establishing a driving connection be tween the gear |31 and shaft |29, the latter then being driven by the motor until the cam reaches another angular position at which vit disengages the'clutch element |30 from element |35, whereupon the motor ceases to drive the shaft. The phases of the machines operation at which such clutch movementsv take place to establish and break the driving connection between the motor and shaft |29 will subsequently be explained.

Carried by the opposite projecting end of shaft |29 to that carrying crank |21 is a plate cam |45,

the contour of which is best shown in Figure 3.

Cam |45 controls movement of a contact arm |41 carrying a movable contact lpoint |38 which, under cam induced movement of the arm |41, is movable into and out of engagement with a fixed contact |49. Contacts |48 and |49 are connected in series with the electrical circuit of solenoid 55, as by means of wires A' spring |50 bears downwardly upon contact ,arm |41 to insure good contact by forcing the points |48|49 firmly together, and a cam follower |55 projecting from the under side of the contact arm and engageable by the high portions of the cam controls movement of the arm to make and break contact between the points. Contact arm |41 is pivotally supported by the upper end of a post |52 rigidly upstanding from the baseplate between the motor and column |2|', and which also carries a stub shaft |53 to which crank |29 is attached. Shaft |53 projects through and from the other side of post |52 and carries upon its such projecting extremity a crank plate |54 lying substantially in a common plane with plate cam |45 and coupled thereto by a link |56, the points of connection of which are angularly spaced from those of bar |26 with cranks |21-|28.

The adjustment of cams |43|45 is such that when crank arms |21-|28 hang down substantially vertically and the trigger plate is in its normal rest position, clutch is disengagedand gear |31 accordingly turns freely on shaft |29, the other working parts of the control unit remaining at rest. During the initial movement of the trigger plate and consequently of cam under the influence of the work, cam follower |55 dropsvinto a low portion |58 of cam |45, permitting the contacts |48--I49 to close. Solenoid is thereby energized and trips the latch 50-62, the machine quickly severs the work in the manner above described, and the severed section falls same direction. As shown in the drawings, the low portion 59 of cam |45 is relatively short, and the dwell during which the contacts are held disengaged relatively long. Therefore as the motor |40 takes up the drive, which occurs shortly after energization of the solenoid, the contacts are again quickly separated and held so. When the parts again reach the position shown in Figures 2 and 3, cam |43 (Figure 5) again disconnects clutch elements |30|35, and the drive'ceases, leaving the contacts |48|49 still separated and the follower |55 substantially at the point shown in Figures 2 and 3, that is,` near the end of the dwell and ready to drop off into the low portion |59 of the cam and close the circuit to the solenoid as soon as the cam |45 is rotated through a slight additional angle by impact of the work against the trigger plate. v

It is only necessary to so position the control unit upon the bed |29 that the trigger plate |25 is impacted when the work has projected itself a desired distance beyond the cutter to provide for gformly cutting the work into desired eng while it wm be apparent that the illustrated Y frame, a traveling carriage carried thereby, al

cutting element carried by the carriage and movable toward and from the same, an actuating `member carried by the frame, means connecting said actuating member and cutting element for operating the latter, means for applying power to the actuating member to move it and the cutting element from its initial position through a desired working phase, means operated by said actuating member for controlling the movement of the carriage relative to the movement of the cutter, releasable means operable to lock said power means in set position with said actuating member in its initial position, resetting means operable independently of said member and element, and means for connecting the resetting means to the actuating member to reset said power means and locked by said releasable means.

2. In a device of the character described,l a frame, a traveling carriage supported by the frame, a work-engaging prtion carried by the carriage, a cutting element movable toward and from said work-engaging portion and also movable with the carriage, means including an actuating member for moving the cutting element'toward and from the work-engaging portion, intermittently applicable power means normally connected to the actuating member for moving it through a portion of its cycle of movement. additional power means normally disconnected from the actuating member for moving the actuating member through the remaining portion of its cycle to re-set saidvfirst mentioned power means, clutching means for connecting said second mentioned power means and the actuating member at the end of the movement of the latter -by'said first mentioned power means. and means responsive to the position of the actuating member for actuating said clutching means.

3. In a machine tool of iiying construction, a frame, a carriage supported by but laterally movable relatively to the frame, a work-engaging portion carried by thecarriage, a tool head also supported by the carriage and movable toward and from the work-engaging portion, a spring normally tending to move the carriage laterally with the work, actuating means, including a driving member, carried by said frame for moving the tool head toward and from the work-engaging portion, and means operated by said driving member and including a cam for coordinating the movement of the carriage under the influence of said spring with the movement of said tool head.

4. In a machine tool of flying construction, a frame, a carriage supported by but laterally movable relatively to the frame, a work-engaging portion carried by the carriage, a tool head also supported by the carriage and movable toward and from the work-engaging portion, actuating means for moving the carriage laterally, actuating means for moving the tool head toward and from the work-engaging portion, including a driving member carried by the frame, means also carried by the frame operable for actuating the driving member through a portion of its movement but inoperable through the other portion of its movement, means for actuating said driving member through said other portion of its movement, and controlling means for said last named means.

5. In a machine tool of flying construction, a frame, a carriage movable relatively to the frame, a work supporting portion mc able with'the carriage, a tool head movable toward and from the work supporting portion, and actuating means mounted directly on the frame and connected to said head for moving the latter toward the work supporting portion independently of the position or movement of the carriage, said means includ-4 ing a spring, and resetting means independent of said actuating means for moving said head to a desired starting position.

6. In a machine tool of fiying'construction, a frame, a carriage movable relatively to the frame, a work supporting portion movable with the carriage, a tool head movable toward and from the work supporting portion, and means carried by said frame for actuating said head, including a device connected to said head, means operated by said device for controlling the movement of said carriage in relation to the movement of said head, a spring operatively connected to said device for moving it through a portion of its cycle `of movement and power means normally disconnected from said device but operable intermittently for connection thereto and move it through the remaining portions of its cycle whereby said spring is re-set.

7. In a machine tool of flying construction, a frame, a carriage movable relatively to the frame, a work supporting portion movable with the carriage, a tool head movable toward and from the work supporting portion, means for moving the carriage, means for actuating the head including a device connected thereto, and a spring operatively connected to the device for f moving it through a portion of its cycle of movework supporting portion from a starting position through a work performing cycle, driving means for the tool head including a substantially horizontal shaft connected thereto, means for driving the shaft, and means for controlling movement of the shaft including a weight connected to the shaft and lying preponderantly on one side thereof and so arranged upon the shaft-that when. the head is in starting position the weight is elevated but is in advance of its upper dead center in the directionof movement of the shaft.

9. In a machine tool of ying construction, a frame, a carriage movable relatively to the frame, a work supporting portion movable with the carriage, a tool head movable toward and from the work supporting portion, and means for actuating the head including a crank connected thereto, spring means arranged to exert e'ort in one dimension and connected to the crank to apply power thereto through substantially half a revolution, the last mentioned connection of the spring to the crank being angularly spaced from the flrst mentioned connection, whereby the head may be moved both toward and from the Work supporting portion during a half revolution of the crank induced by the spring.

10. In a machine tool of flyingconstruction, a frame, a carriage movable relatively to the frame, a work supporting portion movable with the carriage, a tool head movable toward and from the work supporting portion, and means carried by said frame for actuating the head including a shaft and a crank connected thereto, spring means arranged to exert effort in one direction and connected to the crank to apply power to the shaft through substantially half a revolution, to thereby move the head from a starting position toward the work supporting portion and again away therefrom, independent driving means normally disconnected from said shaft for returning the same to starting position, and clutching means responsive to changes of angular position of the shaft vfor connecting and disconnecting said independent driving means with respect tothe shaft.

11. In a machine of the character described, a working head, driving means for the head including a shaft and. power storing means connected thereto, latching means for holding the shaft in desired initial position, tripping means for releasing the latching means to permit movement of the head under the influence of the power storing means, and independent driving means for said shaft normally disconnected therefrom and co-ordinated with the movement of the head for rotating said shaft and returning the latter to said initial position.

12. In a machine of the character described, a work supporting portion, a working head movable toward and from the same, driving means for the head, means for holding said driving means inoperative,. electrically operable tripping means for releasing said holding means, and control means responsive to movement of Work being operated upon for controlling said tripping means, said control means including a trigger member appurtenant said vwork supporting portion, a cam connected to said trigger, contacts operable by said cam and electrically connected to 'said tripping means, and means for resetting said cam after actuation thereof by the work including a motor connectible to said cam, and means responsive to the position of the cam for connecting and disconnecting said cam and motor.

13. In a shearing mechanism, the combinafirst mentioned power means, control means be tween said shaft and said separate power means, co-ordinated with the rotation of the shaft under the infiuence of said first mentioned power means. for connecting said separate power means to the shaft and disconnecting said means therefrom, means for locking said first mentioned power means in re-set condition against operation, and means for actuating that element of said locking means which permits operation of said first mentioned power means after said separate power means has been disconnected from said shaft.

14. In a mechanism for shearing material, the combination with a support, of a reciprocatable cutter mounted thereon, a shaft, operative connections between said shaft and said cutter, power means adapted to be set in condition for applying power to said shaft and operable when released for rotating said shaft through a portion of its cycle to effect operation of said cutter, separate power means for rotating the shaft through the remaining portion of its cycle and re-setting said first mentioned power means, control means between said shaft and said separate power means, co-ordinated with the rotation of the shaft under the infiuence of said first mentioned power means, for connecting said separate power means to the shaft and disconnecting said means therefrom, means for locking said first mentioned power means in re-set condition against operation, and means controlled by the material for actuating that element of said locking means which permits operation of said first mentioned power means after said separate power means has been disconnected from said shaft.

15. In a mechanism for shearing material, the combination with a support, of a reciprocatable carriage thereon, a reciprocatable cutter mounted on said carriage, a shaft, operative connections between said shaft 4and said cutter, power means arranged to be set and locked in effective relation to said shaft, for rotating said shaft through a portion of its cycle to effect operation of said cutter, separate power means for rotating the shaft through the remaining portion of its cycle and re-setting said first mentioned power means, control means between said shaft and said separate power means, co-ordinated with the rotation of the shaft under the influence of said first mentioned power means, for connecting said sepanism, including means operated by said shaft, for

reciprocating said carriage whereby it moves in one direction with the material. i

16. In a shearing mechanism, the combination with a support, of a reciprocatable carriage thereon, a reciprocatable cutter mounted on the carriage, a crank shaft, operative connections between said shaft and said cutter, power means adapted to be set in condition for applying power to said shaft and operable when released for rotating said shaft through a portion of its cycle to effect operation of said cutter, separate power means arranged to be connected to said shaft at the end of that portion of its cycle under the infiuence of said first mentioned power means, for rotating the shaft through the remaining portion of its cycle and resetting saidfirst mentioned power means, control means co-ordinated with the rotation of said shaft in each cycle thereof for connecting said last mentioned power means to said shaft and disconnecting said means therefrom, means for locking said shaft against operation under the infiuence of said first mentioned power means following the resetting thereof, and means for actuating that element of said locking means which permits operation of said first men-l tioned power meansafter said separate power means has been disconnected from said shaft, and

said locking means and operable, when released,l

to rotate said shaft through a portion of its cycle to actuate said cutter, means controlled by the material for operating said locking means to per- K mit operation of said power means, separate power means normally disconnected from but arranged to be connected to said shaft at the end of the movement thereof `under the infiuence of said firstmentioned power means for rotating said shaft through the remaining portion of its cycle for re-setting said power means, and means controlled by said shaft in co-ordinated relation to the movement thereof by said first mentioned power means for connecting said separate power means to said shaft and disconnecting said means therefrom.

18. Ina mechanism for shearing material, the combination with a support, of a power element, a tool connected to and operated by said element, expansion means connected to said element and arranged to move it from its initial position substantially a predetermined distance, whereby said tool is actuated, separate means normally disconnected from said element, but arranged to be connected thereto for moving said element to its initial position and re-setting said expansion means, means for controlling the connection of said second moving means to said element and disconnection therefrom, and means for controlling said expansion means.

19. In a deviceof the character described, a frame, a traveling carriage carried thereby, a Work-supporting portion carried by the carriage, a cutting element movable toward and from said work-supporting portion and also movable with the carriage, means including an actuating member for moving the cutting element toward and from the work-supporting portion, power means normally connected to the actuating member for moving it through a portion of its cycle of movement, separately operable power means for moving said member through the remaining portion of its cycle, said separately operable power means being disconnected from said member during movement of the latter by said first mentioned power means.

20. In a device of the character described, a frame, a reciprocable carriage mounted on the frame, a work bed movable with the carriage, a tool head mounted on said 'carriage and movable toward and from the bed, means carried by the frame and including a shaft for moving the tool head toward said bed, continuously operated' means normally disconnected from said shaft but arranged to be connected thereto for moving the 10 tool head away from the bed, means controlled by said shaft for reciprocating said carriage during the active and: receding strokes o! said tool head and arranged to move the work bed and tool head with the work in the active stroke oi the latter, releasable clutch means for connecting the shaft to said continuously operated means, and means Y co-ordinated with the movement of said tool head to predetermined positions for actuating sai clutch means.

Anuman'131m. BoazYM.

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