US2617098A - Clip forming and applying machine - Google Patents

Description

Nov. 11, 1952 A. LENART ET AL 2,617,098

CLIP FORMING AND APPLYING MACHINE Filed April 17, 1950 8 Sheets-Sheet 1 IN VEN TOR5 Nov. 11, 1952 A. LENART ETAL- 2,617,098

CLIP FORMING AND APPLYING MACHINE Filed April l7 1950 8 Sheets-Sheet 2 7 7/ 4 V a Y JN ENToIw,

Nov. 11, 1952 A. LENART ET AL 2,617,098

CLIP FORMING AND APPLYING MACHINE Filed April 17, 1950 8 Sheets-Sheet 3 5/ ill W //5/a 7a 77 L M j WM H 00 77 ze 75 2/1 @75 w INVENTORS,

if @Mzw NOV. 11, 1952 N T ETAL 2,617,098

CLIP FORMING AND APPLYING MACHINE Filed April 17,-1950 8 Sheets-Sheet 4 &.

Nov. 11, 1952 A. LENART ET AL 2,617,098

cup FORMING AND APPLYING MACHINE Filed April 17, 1950 I s Sheets-Sheet s Nov. 11, 1952 A. LENART EI'AL 2,617,098

CLIP FORMING AND APPLYING MACHINE Filed April 17, 1950 sweets-Sheet e @ME Z War/7.9a

Nov. 11, 1952 A. LENART ETAL 2,617,098

CLIP FORMING AND APPLYING MACHINE Filed April 17,- 1950 s sheei's sheet 7 INVENTOR5. /7 7 //0/2y far/Zara //?///??a/7 NOV. 11, 1952 A LENART ETAL 2,617,098

CLIP FORMING AND APPLYING MACHINE Filed April 17, 1350 8 Sheets-Sheet 8 INVENTORS.

45(74/ /5/"fld/'0 /76///770/7 Patented Nov. 11, 1952 2,617,098 CLIP FORMING AND APPLYING MACHINE Anthony Lenart and Bernard Heilman, Detroit, Mich., assignors to L. A. Young Spring & Wire Corporation, Detroit, Mich.

Application April 17, 1950, Serial No. 156,444

17 Claims.

This invention relates to improvements in clip forming and applying machine. The improvements set forth and claimed in this application constitute improvements of the machine described and claimed in our copending application for Clip Forming and Applying Machine, Serial No. 732,524 filed March 5, 1947.

The principal objects of this invention are:

First, to provide an improved form of machine for severing wire stock into short blanks and forming the blanks into clips which are thenapplied to a work piece by closing the clips around adjacent elements of the work piece.

Second, to provide a clip forming and applying machine which is operated by compressed air and in which the energy for closing the clips is directly supplied by compressed air whereby the final closing force on the clips may be adjusted to any desired value.

Third, to provide pneumatic operating mechanism including work performing cylinders and control valves for automatically advancing and retracting the forming and closing jaws of a clip forming and applying machine and for moving the closing jaws to clip applying position.

Fourth, to provide a clip forming and applying machine in which the closing pressure of the clip applying jaws is as strong or stronger at the end of the closing motion of the jaws than it is at the beginning of the closing motion of the jaws.

Fifth, to provide a clip forming and applying machine which is easily maneuverable and oper-' able over a work piece and in which the operator is required to merely guide and control the operation of the machine by means of .a trigger.

Other objects and advantages relating todetails of our machine will be apparent from "a consideration of the following description and claims and the attached drawings, of which there are eight sheets.

Fig. 1 is a side elevational view of the machine operatively mounted over a work support for joining elements of the work piece.

Fig. 2 is an enlarged side elevational view of the clip forming and applyingmechanism operatively associated with a work piece.

Fig. 3 is a side elevational view of the machine away in vertical Fig. 6 is a fragmentary horizontal cross sectional view taken along the plane of the line B6 in Fig. 5 and looking downwardly in the direction of the arrows to the stock feeding elements of the machine.

Fig. 7 is an enlarged fragmentary side elevational view of the stock feeding cam shown in Fig. 5 and illustrate the range of movement of the feeding mechanism.

Fig. 8 is a fragmentary transverse vertical cross sectional view through the forming and applying mechanism taken along the plane of the line 88 in Figs. 3, 9 and 10. I

Fig. 9 is a fragmentary horizontal cross sectional view taken along the plane of the line 9 9 in Fig. 8 and looking downwardly in the direction of the arrows.

Fig. 10 is a fragmentary side elevational view of the clip forming jaws taken along the plane of the line Iii-l0 in Fig. 9.

Fig. 11 is a fragmentary vertical cross sectional view taken along the plane of the line ll-ll in Figs-8 and 9 and looking in the opposite direction from the view in Fig. 10.

Fig. 12 is a fragmentary verticalcross sectional view taken along the plane of the broken line l2-I2 in Figs. 9 and 13 and showing the clip applying jaws in closed position.

Fig. 13 is a fragmentary bottom'view of'the clip applying jaws. y 1

Fig. 14 is a fragmentary vertical cross sectional view similar to Fig. 10 but illustrating the forming jaws in closed position.

Fig. 15 is a fragmentary horizontal cross sectional view similar to Fig. 9 but illustratingjthe forming and closing jaws in closed position;

Fig. 16 is a fragmentary vertical cross sectional view taken along the plane of the line l6--I6 in Figs. 8 and 15 and illustrating the action of the blank severing jaws. I

Fig. 17 is an enlarged fragmentary elevational view illustrating the action of the closing jaws in applying a clip to elements of a work piece.

Fig. 18 is an enlarged fragmentary plan view showing a clip as applied to the work piece by our machine.

Fig. 19 Ba schematic diagram illustrating the pneumatic controls and operating mechanism for our machine, the elements of the controls being illustrated conventionally and in an at {rest position. Fig. 20 is a schematic view'similar to Fig. 19 but illustrating the cont'rolsand mechanism in an actuated retracting position.

Fig. 1 illustrates generally a desirable operating installation of our machine in which the forming and applying mechanism l is suspended by a coil spring 2 from a carriage 3 mounted on the rail Q. The rail is supported by a suitable framework over an adjustable work support 5. The work support 5 is vertically adjustable on the hydraulic pedestal 6 and adapted to support a work piece in the form of a cushion assembly I for connectionof the elements of the assembly by the machine l. Blank wire stock for the machine 1 is supplied in a continuous manner from the coil-8 through a flexible guide tube 9, and compressed air for operating the machine is supplied through the flexible conduit l5 from asuitable source.

The forming and applying-mechanism I operates in much the same manner and contains many of the same parts as the machine disclosed in our above mentioned copending application. In general the machine consists of a vertically disposed body or base plate H having the operating handle l2 bolted to the front edge thereof. The upper end of 'the'body-is enlarged and has the pneumatic cylinder 13 bolted to the top thereof. A yoke H swingably supports the body H "from the spring 2 and desirably the lower portion of the mechanism is approximately balanced on the yoke'M by'the weight .of thepneumatic cylinder.

As is most clearly illustrated .in Figs. 3 and 4, the cylinder l3. contains .a piston l5 having a piston rod l6 extending downwardly into a slot l'l'in the left side of the body l] as viewed from the front or handle edge of the machine. The lower end of the piston rod 15 is squared to be guided in the slot I! and has a double sided cam l8 secured thereto in overlapping relationship with the sides of the slot. Also slidably mounted in the slot I1 is a generally rectangular elongated ram hand as is most clearly illustrated in Figs. 3 and 8, the ram 19 has a transversely extending notch 20 formed therein. The lower end of the piston rod l6 overlaps-the upper end of the ram l9 and has a laterally projecting finger or flange 2I slidably positioned in the notch 20 to form a'lost motion connection between-the ram-and the-piston rod. Thus downward movement of the :piston rod it; will not affect the ram 19 until'the flange 2i strikes the bottom of the groove 20. Similarly, upward movement of the piston rod will-not afiect the ram until the flange -2l engages the upper side of the groove 28.

The stock feeding and severing .mechanism of the machine is mostclearly illustrated in Figs. 5 to Sand 16. It will be noted that the left face of the body II is vertically recessed or grooved adjacent to the groove Has at 22 (see Fig. 16) to form .aslideway for the shear block '23. The shear block 23 has an oblique vertical face cooperative with a complementary face 24-011 the feed block 25 fitted into the rear edge .of the body H. Blankwire stock entering the recessed body through a hole inthefeed block asat 26 is engaged and-shearedofi bythe descending shear block 23. Movement of the shear block23 is accomplished by means of a roller 21 riding in a transverse slot 28 in the shear block. The roller This-carried on the rearforming jaw 29.

Cooperative with the rear forming jaw 29 is a front forming jaw 30, and-the two are pivotally connected by a pin 3! and vertically guided by a roller 32 on the pin movable ina slot 33 in the body II. The upper ends of the jaws 29 and 3:! are connected by thelinks-34 to a pin-.35 carried on the lowerend of the ram 19.

The forming jaws 2-9 and 35 are movedinto which projects to the right side .of the'body ll through a vertical slot 39 (see Figs. 6, 7 and 8). The outer end of the pin 38 carries a roller 40 engaged in the angle shaped cam slot 41 formed in a feed cam 42. The feed cam is pivotally supported on the right side of the body by the screw 43. The lowerend of the feed cam 52 is pivoted to the rearwardly extending feed arm id as at 4.5. As is most clearly illustrated in Figs. 5 to 7, upward movement of the pin 38 with the ram 19 will result in the roller 40 moving in the cam slot 41 and causing the feed arm 44 to be moved rearwardly of the machine. The rear end of the feed arm 44 is connected to a feedjaw 46 slidably mounted on the rail A? and provided with spring pressed feed pawls 48. Upon lowering motion of the ram and pin 38, the feed arm 44 and jaw '46 will be drawn forwardly and the pawls 48 will feed a predetermined length of the wire stock through the shear block 25. The length of the stock fed into the body of the machine and acrossthe mandrel 36 can be adjusted by positioning the stop screw 49 in the front side of the body opposite the feed block as is most clearly illustrated in Fig. 16.

In order to advance'the severed blank of relatively straight stock transversely to the forming jaws '29 and 30, We have provided a transverse feed shoe 50 shaving upstanding hooked fingers 5i positioned on each side of the mandrel'35. The feed shoe is springably retained along the bottom of the mandrel by a spring clip 52 and is pivotally connected at its outer end to a vertically'extending lever 53. The lever 53 has a fixed pivotal connection to the body H as at 54 and is spring "biased to move inwardly or to the left toward the forming jaws by the coil spring '55. The lower arm of the lever 53 extends along side of the :feed arm 44, and the arm 44 is provided with a bracket '56 embracing theoutside of the lever "53 to form a cam slot 51, the edges of which are operative'to move the lever 53 transversely as the feed arm 44 is moved to the front or rear. As is most-clearly illustrated in Fig. 6, rearward motion of the'feed arm M will permit the lever 53 and feed shoe 50 to move inwardly of the body under the influence of the spring 55 at the end of the retracting motion of the arm 44, ram l9, and the forming and closing jaws as will be described.

As'thearm '44 is moved forwardly to advance a new blank of wire, thelever 53 is immediately drawn outwardly to reposition the hooked fingers 5| to receive the incoming stock.

The forming jaws 29 and 30 which descend and close with downward movement of the ram 19 will thusengage and bend each successive blank about the mandrel 36. It will be noted that a small raised tooth 58on thetop of the mandrel prevents the unformed blank stock from being drawn rearwardly by the retracting hooked fingers 5|. On the next succeeding advancing motion of the feed shoe 50, the inner or leading edges 51A of the hooked fingers 5i will engage and advance the formed clip along the mandrel and into the closing jaws, as will now be described.

v The closing jaws are separated from the forming jaws 29 and why aplate 59 which'closes the recessed side of the "body -I l.

The plate 59 has 54 connected to the lower end of the ram l9.

Thus the closing jaws are reciprocated upwardly and downwardly concurrently with the ram and the forming jaws. The closing jaws are normally held with their lower ends in open position by means of the U-shaped spring 85 which presses inwardly on the links 63 to pivot the upper ends of the forming jaws about a spacer pin 66 (see Fig. 12). After the formed clip has been received in the open lower ends of the closing jaws it is retained in place by reason of the concave shape of the jaws as is more particularly described in our before mentioned co-pending application. After the closing jaws have been advanced downwardly below the bottom of the plate 59 and body .I I, the jaws are in a position to be closed, and .this motion is accomplished by a :closing plate 67 lapped upon the left or outer sides ofthe closing jaws and having an inwardly extending flange 68 along its front edge engageable with the front edge of the front closingjaw. The closing plate 61 is pivotally supported by the bolt 69 on a cover plate 18, and the rear closing jaw is restrained against displacement by a depend:

ing finger H on the bottom of the plate 59.

Closing motion of the plate 81 is accomplished by a pneumatic cylinder 12 having a piston rod 13 which engages the bracket 74 secured to theupper end of the closing plate. The closing plate is returned to open position by the coil spring 15. The mechanism for regulating the actions of the clip forming and advancing cylinder l3 and the clip closing cylinder 12 consists generally of a lower valve 18 and an upper valve 11 secured to the rear and front edges respectively of the body II. The valves have actuating pins 18 which project toward the ram I9 and are in a position to be alternately actuated by the double sided cam plate [8 as the piston l6 reciprocates in the cylinder [3. A reversing valve 19 secured to the top of the body reverses the supply of air top and bottom of cylinder 13.

The several communicating passages and valves for interconnecting and operating the pneumatic system are most clearly understandable from a consideration of the diagrammatic views in Figs. 19 and 20. It will be understood that the necessary passages and chambers corresponding to. the conduits shown conventionally in these figures areprovided in the body of the machine I, but it is believed unnecessary to a complete understanding of our machine to point out in-detail 'where these passages are provided within the body H. The passages could take the form of external pipes or conduits connecting the several valves and cylinders if this was desired. Where the, several passages appear in the drawings of the machine, they have been given reference numerals corresponding to the numerals of the conventionally illustrated conduits and pneumatic system, which will now be described.

The reversing valve 19 positioned-at the top of the body has an elongated valve chamber 88 into the center of which the air supply conduit I8 continuallyopens. Opening to the chamber 88 on opposite'sides of the conduit lll are a retracting conduit 8| and an advancing conduit 82 which extend respectively to the bottom and top of the pneumatic cylinder 13. A double ended valve element 83 reciprocable in'the chamber alternately connects the supply conduit ID with the retracting and advancing conduits Bl and 82. Piston faces-84 onthe ends of the valve element 83 function to move the valve element under the influence of air pressure admitted to the ends of the chamber 88, as will be described presently, and vent passages 85 are positioned to vent the conduits 8| and 82 to the atmosphere whenever either of these conduits are inoperative.

. ,Air pressure is continually supplied from the conduit I8 and chamber 89 through a control conduit 86 which extends downwardly to a trigger valve 81 positioned'in the handle I2 of the machine. A trigger 88 on the grip is operative when depressed to open the conduit'86 to the conduit 89. When the valveBT is closed, the conduit 89 is vented to the atmosphere through a port 98, in thehandle. The control conduit 86 also has. a branch passage 9| extending to the upper valve 11, the purposeof which will be described presently.

The conduit 89 opens to the lower valve 16, and when the piston rod 16 and double sided cam I8 are in lowered position as shown in Fig. 19, the valve element 92 of the lower valve will' be retracted by the cam in the position illustrated'to permit the flow of air through the lower valve and conduit 93 to the clip closing'cylinder I2. The 'flow of compressed air into the cylinder 12 will build up a pressure in the cylinder tending to move the piston 94 and piston rod 13 outwardly to close the clip forming jaws. A conduit 95 also opens to the face of the piston 94, but an adjustable pressure relief valve 96 positioned in the cylinder 12 prevents the admission of air to the conduit 95 until the desired operating pressure has been built up in the cylinder 72 and the piston rod 13 has moved to close the clip closing aws.

in the system after the trigger 88 has been ac-' tuated as shown in Fig. 20, it will be noted that the predeterminedpressure in the cylinder 12 willhave moved the jaw .closingplate 61 to 0105-- ing position, and the pressure within the cylinder 12 having been built up sufficiently to open the valve 96, air will have been admitted to the left,

end of the reversing valve 19 to move the valve element 83 to the right. The supply of compressed air to the advancingconduit 82 is shut oiT, and air is admitted to the retracting conduit 8! and the bottom of the cylinder I3 to start up-' ward movement of the piston l5 andpiston rod IS. The first upward movement of the piston rod It will have moved the double sided cam l8 away from the tappet on the lower valve 92, permitting the spring 91 to move the lower valve to close oif the conduit 89 and vent the conduit 93;

and cylinder 12 to the atmosphere through the vent 98. -Due to the lost motion connection between the piston rod l6 and ram l9, no vertical movement will have been imparted to the closing.

' jaws 61 and 82 or the forming jaws-29 and 38,

and the closing plate 61 will have time to move to open position, the return spring 55 functioning to return both the closing plate and the pis-' ton 94, The piston l5 will continue its upward motion so that the piston rod l6 picks up and their retracted position and will advance a clip Turning now to the conditions that will exist aerwcoe 7 blank: along theimandret to :underneaththe; formingrjaws. :Near the npperilimitiof .-traveltoffthe piston rod l6,.the doublessidedcamilliwillengage and depress the tappet :or xthe valve element .99

in athe'zupper't'valve "H. The :upper valve Tl'ls biased-shy: the :spring 1 80 torclose' the oonduit 9 I fronizth'e conduit 101. in closed'lposition, the valve :1! "vents the conduit I l ithroug-h 'the -vent m. :Qninward movement of thew'valve element, airipressurexfrom the branch zconduit Sl isia'dmitted through the conduit IM to the right end of the :reversing valvefl. i'I'he valve element -BS is thus moved to the i-leftzto the "position shown in I-Fig. 19, cutting off the 1' supply of compressed air to the bottom: of l the'cylinder t 3 and stopping the upward movement tof the'piston andrani.

The downward movement'tot the pistonand' ram follows immediately and'iautomaticallyxsince the valve:element"83 automatically opens the reversing valve-19 to-thecon'duitM. The initial" downward-movement of the ram actuates thepin 38 and the eam link "42 to drive the feed arm 4B in stock feeding motion and "to retract the shoe 50.

The system is thusentirely automatic upon actuation 'of the trigger' 88. andthe mechanism will continue to reciprocate and open and close the closingjawsso' long as the trigger isihel'd 'depressed. The .rateatwhich'the system .will operate-may -be regulated by adjustmentof the valve flt'wl'lich determines the 'pressure which mustbe built "up withinthe cylinder 12 bfore the-reversing valve is'moved lto retracting position. :A spring biased bleed valve l03ibuilt into the wallofthe cylinder i2 andcommunicating with the conduit 95 is adjustable to determine the rate'at which the'zpressure 'behind the left end of the valve -'element 83 is ldissipate'd'and overcome by th'e pressure in the conduit 'ifll to shift the reversing "valve and start the down' stroke of the system. The resistance of bleed valve 1'03 also assures that :sufiicient pressure will be built up in conduit 5 95' to shift the -'valve element83 in the reversing valve: 19.

7 Having thus described our invention, --what we claim as new 1 and desire to secure "by Letters Patentds:

1 Int-combination witha clip" forming and applying machine havingclip forming and clip closing-jaws and .aa recipro'cable ram connected to advance said'jaws, a first pneumaticcylinder having'a piston rod connected to reciprocate said ram andihaving a lost *motionconnection therewith, "a cam carriedloysaid piston rod, a

second pneumatic cylinder having "apiston positioned when extended 'to -act upon and-close said closingijawa upper and lower valves positioned inspace'd relationship along and adj acent to said piston rodand spring biased to pressure shut-off positionisaid valves having tappets' arranged to i be alternately :depressedby'said cam toopen -said valves, a -reversing valve having a source orair pressure opening thereto and hav'in'g :a pneumatically shiftable' val-ve elemena adva'ncingan'd retracting lconduits opening to said reversingvancing' positionwhenr'said upper valve is opened by i said: cam, *axse'cond :branch rcon'duit opening from .i-said trigger "valve '?to said lower "valve ':to supply vair -tliereto when said ltrigger valve :is open;:a'aconduit:openingbetweensaid second'icylinder :andJsaid viewer "valve and communicating with? saiidesecond branch "conduit whenvsaidlower valve 'is openedibyisaid cam, 'a second valveshiitin'g: conduit vlcoinmunicatingr between. said second cylinder and the opposite; end of xsai'dfireversing valvefirom'zsaidifirst shifting" conduit, andiantadjustable ssprin'g biased valve "in said :second valve shiftingcoonduit iop'posingi thelpassage-fof airirrom said second cylinder tosaid reversingvalveinntil a :predetermine'dxpressurei is established ini said latter cylinder, said :second valve shifting conduit havinganiadiustable bleed'valve opening there'- from ssaid upper and 'lowerrand reversing and trigger 1 valves having vent :ipassages opening 1 to the outlet sides thereof 'when the shit table 'elements thereof are impressureshut-ofi position.

2. In combination-with afclip' forming and-applyingmachine havingclipformingand clip :closing jaws "and a reciprocable 'ram' connected to advance said jawspa fir'st pneumatic 'cylinder having a piston rodconencte'd to reciprocate said ram and having a lostmotion-connectiontherewith, :a cam reciprocable with said -piston' ro'd, a second pneumatic cylinder having a piston positioned when-'extended to act upon and-close said iilosin'g jaws, ilrst and second valves vpositioned in spaced relationship along and a'diacent to said piston rod and spring biased to: pressure shut-off position, said valves having tappets: arranged-to :be alternately depressed by said i cam to open said valves.- areversing valve :having a source oi air'pressure opening thereto and having-'a 'pneumatically shiftable valve element, advaneing and detracting conduits opening to said reversing: valve and alternatively connetable to said sourcebysaid:reversing valve, said'conduits opening to "opposite ends of said first cylinder, a control i conduit opening to said source and having a trigger valve therein a 'fir'st branch-conduitcontinuously'opening from said control conduit to said first valve, a first valve shifting conduit sextendi-ng from said first valve to said reversing valve and adapted to admit air to move said :reversing valve to ramadvancing position when isai'd first valve -is opened bysaid cam, --a secon'd branch conduit opening from said trigger valve to said second valve to'supply air thereto whenssaid=-trigger valve is open, a conduit opening-between: said second :cylinder and said second valve and communicating with said second branch conduit 'whensai'dsecond valve is opened by:said:cam,1a second valve shifting conduit communicating between said second cylinder and-the opposite fiend of said reversing valve from Y said firstfshifting conduit,:and ana'djustable valvein saidsecond valve shifting :co'n'duit opposing the passage of' airzfrom' saidtsecond cylinder" to said reversing :valve until ea predetermined "pressure is establishediin said latter :cylinder, saidsecond valve 'shiftingrcondui-t havin'gazbleed valve' opening therefrom.

3. In combination-with :a clip I forming and applying machine having clip forming :and clip closing jaws and-areciprocableram connected to advance said ijaws, a :firs't pneumatic cylinder having apiston-rod connected to reciprocate said ram, a cam 'reciprocable with'-said piston rod, 2. second:pneumaticcylinder having a piston -po sitioned when extended to' act upon and close -saidclosing;iaws, first-and secondva-lves posimatically shiftable valve element, an advancing conduit opening to said first'cylinder and selectively connectable to said source by said reversing valve, a control conduit opening to said source and having a trigger valv therein, a first branch conduit continuously opening from said control conduit to said first valve, a first valve shifting conduit extending'from said first valve to said reversing valve andadapted to admit air to move conduit whensaid second valve is opened by said.

cam, a second valve shifting conduit communicating between said second cylinder and the opposite end of said reversing valve from said first shifting conduit, and an adjustable valve in said second valve shifting conduit opposing the passage of air from said second cylinder'to said reversing valve until a predetermined pressure is established in said latter cylinder, said second valve shifting conduit having a bleed valve open ing therefrom.

4. In combination with a clip forming and applyingmachine having clip forming andclip closing jaws and a reciprocable ram connected to advance said jaws, a first pneumatic expansive de-,

vice having a rod connected to reciprocatesaidram and having a lost motion connection therewith, a second pneumatic expansive device operatively connected to andarranged when extended to close said closing jaws, first and second valves positioned in spaced relationship along and adjacent to said rod and spring biased to pressure shut-off position, said valves havingtappets arranged to be alternately depressed by a'portion of said rod to open said valves, a reversing valve having a source of air pressure openingthereto and having a pneumatically shiftable valve element, an advancing conduit opening to said first device and alternately connected to said source and vented to the atmosphere by said reversing valve,

a control conduit opening to said source and having a trigger valve therein, a first branch conduit continuously opening from said control conduit to said first valve, a first valve shifting conduit extending from said first valve to said reversing valve and adapted to admit air to move said reversing valve to ram advancing position when said first valve is opened by said rod, a second branch conduit opening from said trigger valve to said second valve to supply air thereto when said trigger valve is open, a conduit opening between said second device and said second valve and communicating with said second branch conduit when said second valve is opened by said rod, a second valve shifting conduit communicating between 5. In combination with a clip forming and applying machine having clip forming and clip closing jaws and a reciprocable ram connected to ad- ,vance said jaws, a first pneumatic expansive device having a rod connected to reciprocate said ram, a second pneumatic expansive device operatively connected to and arranged when extended to close said closing jaws, first and second valves positioned in spaced relationship along and adjacent to said rodand spring biased to pressure shut-off position, said valves having tappets arranged to be alternately depressed by a portion of said rod to open said valves, a reversing valve having a source of air pressure opening thereto and having a pneumatically shiftable valve element, an advancing conduit opening to said first device and alternately connected to said source and vented to the atmosphere by said reversing valve, a control conduit opening to said source and having a trigger valve therein, a first branch conduit continuously opening from said control conduit to said first valve, a first valve shifting conduit extending from said first valve to said reversing valve and adapted to admit air to move said reversing valve to ram advancing position when said first valve is opened by said rod, a second branch conduit opening from said trig"- ger valve to said second valve to supply air thereto" versing valve until a predetermined pressure .is

established in said latter device. 6. Actuating mechanism for a clip forming and applying machine having reciprocably mounted forming jaws'and closing jaws, said mechanism comprising apneumatically operated piston having a rod connected to advance said jaws and havinga lostmotion connection therewith, a source of air pressure, a conduit connecting .said

source to said piston to advance said piston, a: valve in said conduit pneumatically movable. be-* tween open and closed position, a mechanically operable valve spring biased to closed position and arranged .to be opened by engagement with-a portion of said rod on movement of said piston to retracted, position, a second conduit controlled by said last valve and opening between saidsource and first valve to move sald first valve 'to. opened position, a second pneumatically operated piston positioned to act upon and close said closingjaws when said jaws are in advanced position, a supply conduit opening said. source to said second piston, a-manually operative control valve in said supply conduit,- 2, second mechanically operated valve po.--

sitioned in said supply conduit between said conetrol valve and said second piston and spring biased to closed position, said second mechanically op-- erated valve being positioned to be opened by engagement with a portion of said rodon move-,

ment of said first piston to advanced position, a fourth conduit opening between the pressure face of said 'second piston and the movable element of said first valve in opposition to said second conduit to admit air from said second piston to move said first valveto closed position, a spring pressed valve in said fourth conduit opposing movement of air therethrough until' a-predeter- 11 mined pressure is exerted on said second piston, and .a spring closed outlet valve from said fourth conduit opposing escape of :pressure from said fourth conduit until suflicient pressure is built up therein to shift the movable .elementof said first valve.

7.. .Actuating mechanismfcr a clip forming and applying machine having reciprocably mounted forming jaws and closing jaws, said mechanism comprising a pneumatically operated piston havingacrod connected to advance said jaws, asource of .air pressure, a conduit connecting said source to said piston to advance said piston, a valve .in said conduit pneumatically movable between open and closed position, a mechanically operable valve spring biased to closed position and arranged to be opened by engagement with a portion of said rod movement of said piston to retracted position, a second conduit controlled by said last valve and opening between said source and first valve to move said first valve to opened position, asecond pneumatically operated piston positioned to act upon and close said closing ,jaws when said jaws are in advanced position, a supply conduit opening said source to said second piston, amanually operative control valve in said supp y conduit, a second mechanicallv operated valve positioned in said supply conduit between said control valve and said second piston and spring biased to closed position, said second mechanically operated valve being positioned to be opened by engagement with a portion of said .rod on movement of said first piston to advanced position, .a fourth conduit opening between the pressure face of said secondpiston and the movable element of said first valve in opposition to said second conduit to admit air from said second piston to move said first valve to closed position, and a spring pressed valve in said fourth conduit opposing movement .of air therethrough until a predetermined pressure is exerted on said second piston.

'8. Actuating mechanism for a clip forming and applying machine having reciprocably mounted forming jaws and closing jaws, said mechanism comprising a fluid pressure operated device connected to translate said ,jaws and having a (lost motion connection therewith, a source of fiuid pressure, a conduit connecting said source to said device to advance said jaws, a valve in said conduit movable :between open and closed position, a mechanically operable valve biased to closed position and arranged t be opened by engagement with a movable portion of said device and movement of said device to retracted position, a second conduit controlled by said "last valve and opening between said source and said first valve to move said first valve to opened position, a second fluid pressure operated device positioned to act upon and close said closing jaws when said jaws are in advanced position, a supply conduit opening between said source and said second device, a manually operative control valve in said supply conduit, a second mechanically operated valve positioned in said supply conduit between said control valve and said second device and biased to closed position, said second mechanically operated valve being positioned to be opened by engagement with a movable portion of said device and movemom; of said first device to advanced position, a fourth conduit opening between the pressure face of said second device and the movable element of said first valve in opposition to said second conduit to admit fluidfrom said second device to move said first valve to closed position, a biased valve in said fourthconduit opposing movement of .fiuid thcrethrough until a predetermined pressure is exerted on said second device, and a biased outlet :valve from said .fourth conduit opposing escape of pressure from said fourth conduit until sufiicient pressure is built up therein to shift the movable element of said first valve.

9. Actuating mechanism for a gclipforming and applying machine having reciprocably mounted forming jaws and closing jaws, said mechanism comprising a fluid pressure operated device connected to translate said jaws, a source of fluid pressure, a conduit cormacting said source to'said device to advance said jaws, a valve in said convalve .to move said first valve to opened position,

a second fluid pressure operated:devicepositioned to-act upon and-closesaid closing jaws when said jaws .are in advanced position, a supply conduit opening between said source and said second device, .a manually operative control valve in said supply conduit, asecond mechanically operated valve positioned in said-supply conduit-and biased to closed position, said second mechanically operated valve being positioned tube-opened by engagement with a movable portion of said device and movement of said first device to ,ad-

' vanced position, a fourth conduit opening bedevice connected to .translatesa'id jaws, a source of fluid pressure, a conduit connecting saidsource to 'said device to retract said jaws, a valve in said conduit movable between open and closed position, a mechanically operable valve biased to 'closedposition and arranged to .be opened 'by engagement with a movable portion of said device and movement of said device to retracted posi- -tion, a second conduit controlled by said last valve and opening between said source and said first valve to move said first valve to closed position, a second fluid pressure operated .device positioned to act upon and close said closing jaws when said jaws are in advanced position,

" a supply conduit opening between said source and said second device, a manually operative control valve in said supply conduit, a second mechanically operated valve positioned .in said 4 supply conduit between said control valve and said second device and biased to closed positio11, said second mechanically operated valve being positioned to 'be opened by engagement with a movable portion of said device and movement of said first device to advanced position, a

"fourth conduit opening between the pressure face of said second device and the movable element of said first valve in opposition to said second conduit to admit fluid from said second device to move said first valve to open position, a biased valve in said fourth conduit opposing movement of fluid therethrough until a predetermined pressure is exerted on said second device, andv a biased outlet valve from said fourth conduit opposing escape of pressure from said fourth jconduit until sufficient pressure is built up therein to shift the movable element of said first valve.

11. Actuating mechanism for a clip forming and applying machine having reciprocably mounted forming jaws and closing jaws, said mechanism comprising a fluid pressure operated device connected to translate said jaws, a source of fluid pressure, a conduit connecting said source to said device to retract said jaws, a valve in said conduit movable between open and closed position, a mechanically operable valve biased to closed position and arranged to be opened by engagement with a movable portion of said device and movement of said device to retracted position, a second conduit controlled by said last valve and opening between said source and said first valve to move said first valve to closed position, a second fluid pressure operated device positioned to act upon and close said closing jaws when said jaws are in advanced position, a supply conduit opening between said source and said second device, a manually operative control valve in said supply conduit, a second mechanically operated valve positioned in said supply conduit and biased to closed position, said second mechanically operated valve being positioned to be opened by engagement with a movable portion of said device and movement of said first device to advanced position, a fourth conduit opening between the pressure face of said second device and the movable element of said first valve in opposition to said second conduit to admit fluid from said second device to move said first valve to open position, and a biased valve in said fourth conduit opposing movement of fluid therethrough until a predetermined pressure is exerted on said second device.

12. Actuating mechanism for a clip forming and applying machine having reciprocably mounted forming jaws and closing jaws, said mechanism comprising a first pneumatically extensible device connected to reciprocate said jaws, a second pneumatically extensible device operatively associated with said closing jaws to close said closing jaws, a source of air pressure, a supply conduit having a manually operated valve positioned therein and connecting said source with said second device, a pneumatically shiftable valve connected between said source and said first deviceand operative in its opposite positions to oppositely actuate said first device, a first automatically operated valve arranged to admit air to said shiftable valve to move said shiftable valve to jaw advancing position and positioned to be opened by engagement with a movable portion of said device and movement of said first device to retracted position, a second automatically operated valve connected in series with said manually operated valve and positioned to be opened by engagement with a movable portion of said device and movement of said first device to advanced position, and a conduit having an adjustable minimum pressure control valve therein and communicating between said second device and the movable element of said shiftable valve for admitting air to said shiftable valve to move said shiftable valve to jaw retracting position.

13. Actuating mechanism for a clip forming and applying machine having reciprocably mounted forming jaws and closing jaws, said mechanism comprising a first penumatically extensible device connected to reciprocate said jaws, a second pneumatically extensible device operatively associated with said closing jaws to close said closing jaws, a source of air pressure, a supply conduit having a manually operated valve positioned therein and connecting said source with said second device, a pneumatically shiftable valve connected between said source and said first device and operative in its opposite positions to oppositely actuate said first device,

a first automatically operated valve arranged ment of said first device to advanced position,

and a conduit having a minimum pressure control valve therein and communicating between said second device and the movable element of said shiftable valve for admitting air to said shiftable valve to move said shiftable valve to jaw retracting position.

14. Actuating mechanism for a clip forming and applying machine having reciprocably mounted forming jaws and closing jaws, said mechanism comprising a first fluid pressure ex-- tensible device connected to advance said jaws, a second pneumatically extensible device operatively associated with said closing jaws to close said closing jaws, a source of fluid pressure, a

supply conduit having a manually operated valve positioned therein and connecting said source with said second device, a pneumaticallyshiftable valve connected between said source and said first device and operative in open position to actuate said first device, a first automatically operated valve arranged to admit fluid to said shiftable valve to move said shiftable valve to jaw advancing open position and positioned to be opened by engagement with a movable portion of said device and movement of said first device to retracted position, a second automatically operated valve connected in series with said manually operated valve and positioned to be opened by engagement with a movable portion of said device and movement of said first device to advanced position, and a conduit having an adjustable minimum pressure control valve therein and communicating between said second device and the movable element of said shiftable valve with said second device, a pneumatically shiftable valve connected between said source and said first device and operative in open position to actuate said first device, an automatically operae-rzoos:

1 3 ated valve arranged-to admit fluidi'to said shift.-

able valve to-niove said.shiftable valve toi jaw" advancina open" position 1 and positioned to Lbe" openedby engagement witha movablmportion of said device" and movement tot said 'first device 5 toretracted position, and a conduit; having: a"

minimum pressure" control ivalve' therein and communicating ibetv'veen said second device and the movable element of said shiftable valve for admittingLflUid to sai'dhshiftablelvalve to move said .sh'iftabl'e valve to closed p'ositionzr.

16$. Actuatingime'ohanism fori'ai clip forming i ands: applying-t. machine having-i reciprocably mounted iformingi jaws and 'closing; jaws;'.said

mechanism comprisingi'a, first vfluid "pressure: ex-

tensllal'e devicel ccnnected' totretraot said jaws,

a second pneumatically extensible device oper-' ativ'ely;'associated'iwith:said'closing jaws to close said 'rcl'osing. jaws,.a.sour-ce oi'fiuid pressure, .a supply conduithavingi a. manually operated valve positionedi'therein "and connecting said source:

With'said second device; a pneumatically shiftable valve connected between said source and said first device-"andzoperative in. open position to actuate saidiifirstrdevicepa first automatically operated valve-arranged to'zadm'it fiuid'lto said-shiftable valveztoimove said shifta'ble valve to closed position and'ipositioned to be fopened by engagement with: a movableportion of said-device and movement ofz-saidfirst device to'retracted'DOSition,

a second automatically operated valveconnected in series with said manually operative valve and positioned to be opened by engagement with a movable-portion of said device and movement of-said first-device to advanced position, and a conduit havingianiadjust-able minimum pressure control valve therein .and communicating be- I tween' said second'deviceand the movableelementxof'xsaid shiftable valve for admitting fluid to said; shiftablevalve to move said shiftable valve toopen'position.

17; Actuating' mechanismfor a clip forming and applying machine having. reciprocably mounted forming. ijaws="and. closing. i'j aws,..said' I. meohanism 'comprising a first fluid pressurei'ex tensible device connected. to retract said jaws,-

a? second. pneumatically extensible device op!- eratively :associated with .saidclosing ijaws' to close said closingjawaa source of fluid pressure," a supply. conduit having a' manuallyi'operated I valve positioned therein and connectingrsaid sourcewith said second device, .a pneumatically" shiftable valve connected between saidsource and said first device and operative in openiposia tion-to actuate said first device, anautomati'callyr operated valve'arrangedto admit fluidrto 'said' shiftable valve to move said shiftablevalveio closed position and positioned to be"openedi-by engagement with asmovable portion :of said idevice and movement ofsaid'first device to- .re:-' tracted position, and aconduit havingfa mini-i, mum pressure control valve thereinvand come municati'n'g between said second device and-.the:

movable element of said shiftable valve for :adq:

mittingjfluid'to said shiftable valve to 'move' said shiftable valve'to open position;

ANTHONY LENART. BERNARD HEILMAN.

REFERENCES CITED The followingrefe'rencesare ofrecord in the file of this patent:

UNITED STATES PATENTS

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