US2141366A - Stapler - Google Patents

Description

Dec. 27, 1938. E L, L Y 2,141,366

STAPLER Filed Nov. 19, 1937 5 Sheets-Sheet 2 IIIQ Mm;

- 1938- i E. L. SIBLEY 2,141,366

STAPLER Filed .Nov. 19, 1957 5 Sheets-Sheet s 5' m1 ii E. L. SIBLEY STAPLER 5 SheetsSheet 4 Filed Nov; 19, 1937 E. L. SIBLEY Dec. 27, 1938.

STAPLER Filed Nov. 19, 1957 5 Sheets-Sheet 5 Patented Dec. 27, 1938 UNITED STATES- PATENT OFFICE 2,141,366 sTAPLER "Edward L. Sibley, Bennington, Vt.

Application November 19, 1937, Serial No. 175,521

18 Claims.

This invention relates to staplers, and it has particular reference to the devices of this character, in which, by appropriate movement of the stapler parts, staple-forming wire is 'fed from a supply of same to the operative mechanism of a stapler head which severs from the supplied wire a length thereof adequate for the formation of the staple, forms the staple from such length of wire, and causes the formed staple to be driven through the papers or other material to be stapled together, and appropriately clinches the staple, all in a single stapling operation, the return of the parts to normal position being instrumental to permit feeding to the stapler head from the supply of wire another length of wire adequate for the formation of another staple upon repetition of the stapling operation.

In the device of the present invention, certain parts of the stapler head, and their functions,

are substantially similar to those disclosed in my ccpending application for patent for Stapler, filed June 29, 1937, Serial No. 151,045. The stapler disclosed in my application referred to is, primarily, of plier type, and actuation of the various parts is accomplished by appropriate manipulation of the plier-like handle levers thereof. In the device of the present invention, the mechanism is so modified, particularly with respect to those moving parts whereby actuation of the stapler head, and feed of the staple -form ing wire, are accomplished, as to furnish a stapler of the so-called desk type. 7

One object of the invention is to provide a stapler of the typereferred to 'of relatively few and rugged parts which are not apt to become defective from continued use, thereby enhancing the value of the device and making it capable of effective functioning practically indefinitely.

Another object of the invention is to simplify the wire feeding means as compared with any devices of a similar character now known.

A further object is to so construct and. relatively mount the various parts of the mechanism as to afiord easy access thereto, particularly as regards the Wire magazine, so that the supply of wire may readily be replenished without undue dismantling of the apparatus.

The invention contemplates, a stapler having a supporting base and a stapler head, the former carrying an anvil, and the latter carrying the staple-forming and driving mechanism and the means whereby such mechanism is actuated, and also carrying the supply of staple-forming wire, and cooperative means carried by the base and sshead, respectively, whereby during actuation of the stapler during the staple-forming and driving operation, appropriate staple-forming lengths of wire may be successively measured off and subsequently fed to' the stapler head. And the invention contemplates, further, various struc- 5 t'ural details, and various preferred and modified constructions and arrangements of parts, all as will be explained hereinafter more fully and finally claimed.

In the accompanying drawings illustrating the 10 invention, in the several figures 'of which like parts are similarly designated,

Figure 1 is a top plan view of the device "or the invention.

Fig. 2 is a side elevational view of Fig. 1 as 15 viewed from the bottom of the sheet.

Fig. 3 is aside elevation, similar to Fig. 2, but with the base omitted.

Fig, 4 is a top plan view of the wire magazine.

Fig. 5 is a view similar to Fig. 4, but showing 20 parts 'of the magazine cover, case and reel broken away, and in section, to illustrate their relative arrangement.

Fig. 6 is a View similar to Fig. 2, but showing the opposite side of the device. 25.

Fig. 7 is a front elevation of the device.

Fig. 8 is a top plan view 'of the base, the parts of the stapler head removed therefrom.

Fig. 9 is a bottom view of the stapler head and associated. parts. 30

Fig. 10 is a view similar to Fig. 2 but illustratihg the parts in the positions assumed at the commencement of a staple-forming oper'a tion, the clutch abutment and wire guide being broken away; 3

Fig. 11 is a View similar to Fig. 10, but illustrating the positions assumed by the parts at the completion of a staple-forming and driving operation.

Fig. 12 is a plan view of the device with the 40 parts in the positions illustrated in Fig, 11.

Fig. 13 is an enlarged central longitudinal section of the device, with the staple-forming wire omitted therefrom. V 45 Fig. 14 is an enlarged detail perspective view of the mandrel and its carrier block.

Figs. 15 and 16 are enlarged fragmentary sectiorial views similar to Fig. 13, but illustrating the parts of the mechanism in the positions as- 50 sumed thereby as shown in Figs. 10 and 11 respectively.

Fig. 1'? is an enlarged perspective view of the yoke and staple driver assembly,and

Figs. 18 and 19 are views similar to Fig. 9,

mechanism for the wire magazine. 7

The base I, which may be in the form of a relatively heavy block of appropriate shape and size to best suit the purposes of the stapler, and to adequately accommodate the operating parts thereof, has pivoted to it at 2, at what may be termed its rear portion, the stapler head, which includes as essential elements a head frame 3 and an operating lever 4. The operating lever 4 is pivoted to the head frame at 5, and these two parts, head frame and operating lever, carry those stapler parts which are movable relatively; to the base and the parts carried by the base,

and which are themselves relatively movable and function to accomplish the feed of staple-forming wire and the formation and driving of the staple.

The head frame is of substantially U-s'haped or channel formation and comprises sides 6 and 'I and a bottom 8, and between the sides 6 and I is rigidly arranged a mounting block S'to which is rotatably attached, as by means of a bearing screw II! the oscillatable wire magazine comprising a casing I I within which maybe mounted a reel I2 enclosed within the casing by a cover I 3.

Wire a (see Figs. 1 and 5) is led from the reel I 2 through an opening I4 in the casing and passes thence between a resilient friction finger I5 and an offstanding feed block i5 carried by the casing and oscillatable therewith. Sufficient pressure is exerted by the part I5- upon the wire to so grip it against theblock I3 that Wire drawn from the reel I2 may be appropriately fed to the staple forming and driving mechanism as will be explained hereinafter. Where the wire emerges from beneath the finger I5, it passes under a guide. pin I6" and extends thence between a pivoted clutch member I 'lnormally inoperative under the influence of a springII', anda clutch abutment 18 through a wire guide I9 formed by curved spaced fingers 2B and 2! and passes thence through a feed tube 22 and into proper operative relation to the staple-forming parts including the mandrel 23, yoke 24 and staple driver 25.

The mandrel 23 is carried by the block 26 and is held in longitudinal sliding relation to the bottom 8 of the frame 3 by means of a screw 21, or equivalent means, the head of which engages a shouldered slot 28 in the bottom. Between the block 26 and the mounting block 9 is interposed an appropriate spring 29 which tends normally to hold the block in its forwardlyprojected position, so that the mandrel 23 underlies the staple-' forming wire fed transversely of the same as indicated at b, Fig. 7.

Due to the fact that the wire is furnished from a coil carried by the reel I2 it is apt to retain a slight bend as it is fed therefrom, and hence its end which emerges from the tube 22 'as it is fed to the staple-forming and driving parts is apt to strike against the adjacent side of the mandrel. To insure feed of the wire transversely of .and above the mandrel the same is provided with a bevelled guiding recess 23' against which the end of the wire may strike and be guided upwardly over the mandrel.

I The yoke 24 is recessed at 30 so that it may straddle the, mandrel 23 when depressed during the staple-forming operation, and it is held in proper sliding relation in the head frame 3 by means of offstanding ribs or keys 3| which en-' gages complemental grooves 32 in the sides or flanges 6 and 'I of the head frame.

The ends of the arms 33 and 33' of the yoke are appropriately recessed to engage and guide but illustrating two modified forms of detent the wire, and the arm 33 may be provided with a cutter blade 34 to sever the wire.

Offstanding from the rear of the yoke 24 is a pair of appropriately'spaced cam projections 35 which, upon depression of the yoke, as will be explained, cooperate with the mandrel carrying block 26 to move the mandrel rearwardly out of the path of the staple driver 25.

The staple driver 25 is provided with a flanged head 25- andismovablewith and slidable relatively to the yoke 24, and it is guided the-rein by ribs or keys 36 which engage complemental grooves 31 in the yoke, these grooves not only accommodating the ribs or keys 36, but serving also to receive the downwardly bent portions or legs of the staple during formation thereof by the yoke in cooperation with the mandrel 23.

The yoke carries oifstanding trunnions 38 engaging cam slots 39 and 40 formed in the side flanges 4I and 42 respectively of the lever 4, and travelling in slots 43 of the flanges E and l of the frame3. The cam slots 39 and 40 are so shaped, and cooperate with the trunnions 38 in such manner, that when the frame 3 and lever 4 are separated, under the influence of a leaf spring 44 fixed on the block 9 and engaging the handle portion 45 of the lever 4, the yoke 24, and with it the driver 25, by virtue of its head 25', will be moved upwardly into the position illustrated in Figs. 1, 2, 3, .6, 7, and 13, so that the'top of the mandrel will becleared for transverse introduction of the, wire, as indicated at b, Fig. 7. Moreover, the design and relative arrangement of the cooperating parts of the yoke, frame and lever is such that excessive movement of the lever and of the yoke is prevented, as will be pointed out hereinafter. Upon reverse relative movement of the lever 4 and frame 3, the cam slots 39 'dicated at 41 (Fig. 8) for engagement with a stop 48, and this pin is actuated in response to movement of the frame 3 and lever 4 by means of a cam member 49 carried by the lever 4 and provided with a bevelled end 50, engagement of which with the pin 46 causes the clutch member H to be projected against the influence of spring H to thus operate upon thewire to hold the wire between it and the clutch abutment I8 during the operation of forming and driving a staple.

Pivotally mounted on the flange 6 of the frame 3 is a combined ratchet and cam member 5| engaging a pin 52 carried by the wire magazine, and operated upon by a'cam surface 53 of the flange 4| of the lever 4, so that when the lever 4 is actuated, during a staple-forming and driving operation, this cam surface 53 will turn the ratchet member M, as illustrated in Fig. 11, to rotate the wire magazine upon its pivot I against the influence of a spring 54 carried by the flange I of the frame and cooperating with a pin 55 carried by the magazine. Thus, when the frame 3 and lever 4 are depressed in the performance of an operation of forming and driving a staple, clutch I'I will hold the wire against movement, as indicated at c, Fig. 12, and the cam surface 53 will function, through the ratchet i and pin 52 to impart return rotative movement to, or oscillate, the magazine and thereby feed off from the reel I2 of wire a length sufficient for the subsequent formation of a successive staple.

- As" it is necessary that the thus measured 01f "length of wire be held against feeding movement relatively to the staple-forming and driving parts of the head until the yoke and driver have been returned to elevate position, and the mandrel to its forward position, means are provided for .arresting return or feeding movement of the wire magazine under the influence of the spring 54 until after release of the lever 4.

These arresting means may take a variety of forms. In the preferred form, as illustrated in Figs. 8, 12 and 13 the arresting means may comprise a depressible spring finger 56, the upwardly extending end of which normally underlies the block it, but which, when the magazine is rotated to measure off a staple-forming length of wire, as just described, will, after being depressed .by the block 16, when the latter is in itslowered position, spring up after the block has been rotated past it and will engage the surface of the block, as shown in Fig. 12, so that return of the magazine, and consequent forward feeding of the wire, will be prevented until release of the lever 4 which simultaneously releases the clutch member I1 and the wire magazine, as the head is raised from the base under the influence of a spring 51.

It will be noted, here, that the force exerted by the spring 54 upon the pin 55 is intentionally less than the longitudinal stiffness of the stapleforming wire, and hence, if the severed end of the wire is so obstructed that it cannot be fed forward, the pressure exerted by the spring 54- will not be sufficient to buckle the wire and thus interfere with proper subsequent operation of the stapler. Moreover, should it occur that more wire is" measured off by oscillation of the wire magazine than that required for formation of a staple, no harm will be done, for the reason that the spring 54 will not buckle the wire, but will feed it forward as required until the surplus has been exhausted and the device resumes normal functioning.

Two additional forms of detent for the wire magazine are illustrated in Figs. 18 and 19. In Fig, 18, a part of the wire magazine, preferably its cover 13, is provided with a ratchet tooth 58 for engagement with a spring finger or detent 59 attached to and travelling with the carrier block 26 of the mandrel 23, as by means of the screw 2'7.

In Fig. 19, a similar arrangement is disclosed, but instead of providing the magazine with a ratchet tooth, as in Fig. 18, a notch 60 is provided for engagement with a spring finger or detent 6! similar to and carried in the same manner as the detent 59.

In either of these modified forms of detent, it will be apparent that, as illustrated, the fingers or detents 59 and 5| will be clear of the cooperating ratchet tooth 58 or notch 69, respectively, when the mandrel is in its forwardly projected position, thus making possible free oscillatory actuation of the magazine through the operation of the ratchet member 5! and cam surface 53. However, after the magazine has been thus oscil lated, and the mandrel 23 and its carrier block 26 rearwardly projected during the staple-forming and driving operation, the detent 59 or 6! will be in position to engage the ratchet tooth- 58 or notch 60, respectively, and to arrest return wire feeding movement of the magazine until the mandrel 23 again assumes its forwardly projected position and the detent 59 or El clears its respective tooth 58 or notch 60. r

If desired, positioning stops 62 and 63 may b provided for appropriately locating the material to be stapled with respect to the anvil 64 which is carried by the base member I and is provided with the required staple turning and clinching depression 65 so located therein as to be in appropriate register with the staple-forming and driving parts when the latter are depressed during the stapling operation.

The following description of the operation of the stapler will be best understood by reference, particularly, to Figs. 1, 2, 10, 11, 12, 13, 15 and 16.

With the parts of the stapler in the positions illustrated in Fig. 13 '(which is their normal position of rest), a filled reel l2 of wire arranged in the magazine, and the wire properly threaded into the stapler head, as illustrated particularly in. Figs. 1, 3 and 7, the papers or other material to be stapled may be arrangedi-n proper position upon the anvil 64 and, if desired, with their edges against the stops 62 and G3. Thereupon, when pressure is applied to the handle portion 45 of the lever 4, the first movement of the stapler head will be a depression of all of its parts toward the base, upon the pivot 2, due to the fact that the spring 51 is not as strong as the leaf spring 54. Hence, the head will be brought down so that the bottom. 8 of the frame 3 will exert pressure upon the material to be stapled to hold it properly upon the anvil 64 and beneath the parts of the staple-forming and driving mechanism. Upon application of further pressure to the handle 55, the parts will assume approximately the positions illustrated in Figs. 10 and 15, wherein the cam. slots 39 and $9 have so o-perated upon the trunnions 38 as to lower the yoke and staple driver into contact with the transversely extending staple-forming length of wire b. As pressure is continued, the cam surfaces 32 and Ml will, through co-operation with the trunnions 38, so depress the yoke 24 that its blade 34 will sever the staple-forming length of Wire and cause it to be shaped over the mandrel to customary staple form, the arms 33, 33 of the yoke carrying the legs of the staple downwardly around the sides of the mandrel within their grooves 31, the staple driver 25 meanwhile remaining stationary-with the recess of its lower edge in engagement with the head or bar of the staple. Obviously, during the formation of the staple, the cam projections 35 of the yoke 24 will function to gradually retract the mandrel 23 from beneath the staple driver, and when, finally, the under surface of the handle portion 45, of the lever contacts with the head 25 of the driver. the mandrel will have been completely retracted, and the staple will be driven, by the driver, through the material to: be stapled, and clinched thereagainst upon the anvil' M, as the continuance of pressure upon the handle 45 moves the parts to the positions illustrated in Figs. 11, 12 and 16.

While these staple-forming and driving operations are taking place, and during that period of movement of the lever t with respect to the frame 3, occurring between the positions illustrated in Figs. 10--l5, 11-16, the cam 49 will have actuated the pin 46 to move the clutch l1 into engagement with the wire to hold it immovably against the clutch abutment l3, and the ratchet 5i will have been operated by the cam surface 53 torotate the wire magazine and through the action of the block 56, to have measured ofi, from the reel of wire, a length of wire suflicient to form a subsequentstaple. When the parts are in this position, as illustrated particularly in Figs. 11, 12 and 16, the detent 5E,

59' or 6|, according to the type employed, will operate toengage its respective part of the wire magazine to prevent reverse rotation or oscillation of the magazine under the influence of the spring 54 acting upon the pin 55, but these parts will be in readiness to impart wire feeding movement to the magazine immediately upon release of the detent 56, 5.9 or M from its respective magazine part. Accordingly, as soon as pressure upon the handle 45 is released, relative movement between the lever A, frame 3 and base I will occur under the influence of the springs M and 51, the clutch ll will be released, the parts of the staple-forming and driving mechanism will be returned to their initial positions, as illustrated in Fig. 13, and the magazine will be free to rotate under the influence of the spring 1, so that under the grip of the friction finger l5 upon the measured length of wire, the next successive staple-forming length of wire will be fed into the head, and the stapler will thus be prepared for a subsequent stapling operation.

It will be noted that the keys or ribs 35 engaging the grooves 32 will permit only a rectilinear sliding movement of the yoke 24, and with this in mind the design of the cam slots 39 and 4B is such that when the lever 4 approaches its position of rest, under the influence of spring 44, a binding action will take place to prevent withdrawal of the yoke from the frame, thus stopping movement of the parts in their predetermined position of rest.

When the reel of wire within the magazine is exhausted, it may be replaced by a fresh reel merely by swinging the stapler head upon its pivot 2 and holding it in such position that access may be had to the bearing screw iii, where upon the magazine may be removed by releasing this screw from the block 9, the cover l3 taken off, the end of the wire of the new reel threaded through the opening M and the new reel'placed within the casing H whereupon the cover I3 may be replaced and the magazine assembled upon the head by appropriately replacing the bearing screw, and thereafter the Wire may be properly threaded into the head.

It will be appreciated that, when the magazine parts are thus dismantled and reassembled some means must be provided for insuring proper arrangement of the pins 52 and 55, which are carried by the cover l3, with respect to the block It as, obviously this relative arrangement governs the proper feed of the wire. Any appropriate marking upon the block and cover, such as that indicated at d, Fig. 4, will serve this purpose. However, if the position of the magazine were reversed, so that the bottom thereof would lie against the head, and carry the pins 52 and 55, this relative arrangement of the cover with respect to the block It would not be essential, and the cover would be eifectively held upon the casing by the head of the screw l0.

From the foregoing, it will be apparent that the stapler of the invention is of relatively simple and rugged construction, and that its parts are so assembled as to afford ready access thereto,

Although the wire clutch mechanism furnished by the parts l1, I8 is carried by the base I, and the wire supply and feed devices therefor are carried by the head, which is capable of extended swinging movement upon its pivot 2 with respect to the base, appropriate cooperative functioning of these parts is insured by the character and arrangement of the wire guiding fingers 20 and 2| which serve to embrace the wire and guide it in its direction of feed toward the tube 22 and in proper cooperative alignment with the clutch member l1, without so confining it as to interfere with its appropriate threaded arrangement with respect to the parts of the head by which it is carried.

It is to be noted that the wire feeding mechanism of the present invention has characteristics of similarity to that'of my copen-ding application above referred to, in that both rely upon movement of the wire magazine with respect to the wire, while the previously fed portion of the wire is held stationary, for feeding off of the successive staple-forming lengths of wire, and for projecting the thus fed wire to the parts of the stapler head. This type of wire feed is much simpler than, and has marked advantages over, any wire feeding mechanism with which I am familiar, in that the wire magazine serves not only as an enclosure for the reel of wire, but functions, also, as the means actuated to measure off and feed the appropriate desired lengths of wire, thus making unnecessary resort to the numerous reciprocatory wire gripping'and feeding parts heretofore employed for the purpose in devices ofthis general character.

Various changes and modifications are considered to be within the spirit of the invention and the scope of the following claims.

What I claim is: r

1. In a stapler, a base, a stapler head pivoted on said base, said stapler head including a frame provided with staple forming and driving parts, an operating lever pivoted on said frame and means for revolubly holding a supply of stapleforming wire, means operable in response to. relative movement of said frame and lever for oscillating said Wire holding means, wire clutch means carried by'sai-d base, and clutch operating means carried bysaid lever and functioning to clutch said wire upon depression of said lever and prior to oscillation of said wire'holding'means.

2. In a stapler, a base, a stapler head including a frame pivotally mounted on said base, staple forming and driving mechanism carried by said frame and an operating lever pivotally mounted on said frame, a wire magazine carried by said frame and oscillatable relatively thereto, means operable in response to relative movement of said frame and lever for oscillating said magazine, and means for feeding wire from said magazine to said staple forming and driving means including clutch means carried by said base and operating means therefor actuated in response to movement of said lever.

3. In a stapler, a base, a stapler head including a frame pivotally mounted on said base, staple forming and driving mechanism carried by said frame and an'operating lever pivotally mounted on said frame, a wire magazine carried by said frame and oscillatable'relatively thereto, means operable in response to relative movement of said frame and lever for oscillating said magazine, and means for feeding wire from said magazine to said staple forming and driving means including clutch means carried by said base and operating means therefor actuated in response to movement of said lever, said wire being separable from said clutch means but retained in operative threaded relation to said staple forming and driving mechanism upon separating pivotal movement between said head and base.

4. In a stapler, a base and a head pivotally separable, parts carried by said head for forming and driving staples, a magazine of staple-formwire carried by said head, means carried by said head for feeding staple-forming wire from said magazine to said parts, and wire guide means carried by said base and normally serving to guide the wire from said magazine to said stapleforming and driving means, said guide means comprising spaced wire-flanking fingers permitting pivotal separation of said base and head without disturbing the arrangement of said wire relatively to the parts of the head.

6. In a stapler, a base and a head pivotally. separable, parts carried by said head for forming and driving staples, means carried by said head for feeding staple-forming wire to said parts, and wire clutch and guidemeans carried by said base, saidguide means permitting pivotal separation of .said base and. head without disturbing the arrangement of said wire relatively to the parts of the head.

'7. .In a stapler, a base and ahead pivotally separable, parts carried by said head for forming and driving staples, means carried by said head for feeding staple-forming wire to said parts, and wire clutch and guide means carried by said base, said guide means comprising spaced wire-flanking fingers permitting pivotal separation of said base and head without disturbing the arrangement of said wire relatively to the parts of the head, one of said fingers providing a clutch abutment.

8. In a stapler, an anvil carrying member, and a stapler head including a frame, staple forming and driving mechanism carried by said frame, an

operating member movable relatively to said frame, and a wire supply and feed mechanism, the latter including a magazine oscillatable on said frame, cooperating parts .carried by said magazine and frame respectively for imparting rotative movement to said magazine in one direction in response to stapling movement of said operating member to measure off a staple-forming length of wire, and cooperating means on said magazine and frame for automatically imparting return movement to said magazine upon release of said operating member; such return movement of the magazine alone serving to feed said measured length of wire to said head.

9. In a stapler, a base, a stapler head pivoted on said base, said head including staple forming and driving means, a wire supply, and an operating lever pivoted on the frame, said wire supply including an oscillatory magazine, and means for imparting rotative movement to said magazine to measure oif a staple-forming length of wire, including a ratchet member carried by said frame and ratchet engaging means carried by said magazine, and a cam carried by said lever and coopto"th'e staple forming and driving means upon releaseof said lever;

' will. In a stapler, a base, a stapler head" pivoted on said; base, said head including staple forming and driving means, a wire supply, and an operating lever pivoted on the frame, said wire supply including. an oscillatory magazine, and means for imparting: rotative movement to saidmagazine to measure off a stapleeforming length of wire,

including aratchet member carried by said frame and ratchetengaging means carried by said magazine, and a cam carried by said lever and cooperating" with said ratchet member to rotate said magazine to measure. a staple-forming length of wire during stapling movement of: said lever, and resilient; means to exert adequate pressure for imparting return movement to, said magazine to feed a staple 'forming length of wire to the staple forming and drivingmeans upon release of said lever.'

11. In a stapler, a base, a stapler head pivoted on said base, said head including staple forming and driving means, a wire supply, and an operating lever pivoted on the frame, said wire supply including an oscillatory magazine, and means for imparting rotative movement to said magazine to measure off a staple-forming length of wire, including a ratchet member carried by said frame and ratchet engaging means carried by said mags azine, and a cam carried by said lever and cooperating with said ratchet member to; rotate said magazine to measure a staple-forming length of wire during stapling'm'ovement of said lever, and resilient means .to exert adequate pressure for imparting return movement to said magazine to feedyastaple-forming lengthiof wire .to the staple forming and driving means upon release of said lever, the pressure exerted by said resilient return means being insufficient to overcome the longitudinal stiffness of said wire.

12. In a stapler, an anvil-carrying member, a stapler head pivoted on said member and including staple forming and driving means, means for feeding staple-forming wire to said staple forming and driving means including an oscillatable wire magazine carried by said head, means actuated in response to stapling operation of the parts of said head for rotating said magazine to measure off a staple-forming length of wire, means for imparting return movement to said magazine to feed a length of wire to the staple forming and driving means upon completion of the stapling operation, and means for arresting return movement of the magazine until the staple forming and driving means have been returned to their initial positions.

13. In a stapler, an anvil-carrying member, a stapler head pivoted on said member and including staple forming and driving means, means for feeding staple-forming wire to said staple forming and driving means including an oscillatable wire magazine carried by said head, means actuated in response to stapling operation of the parts of said head for rotating said magazine to measure off a staple-forming length of wire, means for imparting return movement to said magazine to feed a length of wire to the staple forming and driving means upon completion of the stapling operation, and cooperating means on said anvilcarrying member and magazine respectively for arresting return movement of the magazine until the staple forming and driving means have been returned to their initial positions.

14. Wire supply means for a stapling device of the type which shapes and drives staples formed from appropriate Successive lengths of stapleforming wire, comprising a-casing for rotative application to the stapling device and enclosing a coil of staple-forming wire, 'wire engaging means carried by said casing and operative upon rotative; movement of the casing in one direction to measure off from said coil successive staple-forming lengths of wire, reverse rotative movement of said casing serving alone to feed to the staple shaping,

and driving mechanism such staple-forming lengths of wire, and means carried by said casing for cooperation with complemental actuating means of the stapling device whereby suchrotative wire-measuring and feeding movement is imparted to the casing.

15. Wire supply means for a stapling deviceof the type which shapes and drives staples formed from appropriate successive lengths of stapleforming Wire, comprising a casing for rotative application to the stapling device and enclosing a V coil of staple-forming wire, wire engaging means carried by said casing including an offstanding member and a friction finger between which the wire is engaged and operative upon rotative movement of the casing to measure off from said coil and feed to the staple shaping and driving mechanism staple-forming lengths of wire, and means carried by said casing for cooperation with complemental actuating means of the stapling device whereby such rotative wire-measuring and feeding movement is imparted to the casing.

16. Wire supply means for a stapling device of the type which shapes and drives staples formed from appropriate successive lengths of stapleforming wire, comprising a cylindrical casing for rotative application to the stapling device and enclosing a coil of staple-forming wire, wire engaging means carried by said casing including a peripherally offstanding memberand afriction finger between which thewire is engaged and operative-upon rotative movement of the casing to measureoif from said coil and feed to the staple shaping and driving mechanism stapleforming lengths of wire, and means carried by said casing for cooperation with complemental actuating means of the stapling device whereby such rotative wire-measuring and feeding movement is imparted to the casing.

17. In a stapler, a stapler head comprising a frame and staple forming and driving parts carried by said frame and including a positively guided slidable yoke and a lever operatively connected with and movable relatively to said yoke, and means for imparting concurrent and relative movement to said yoke and lever, the guided slidable arrangement of said yoke in said frame and the connection between said yoke and lever functioning'to arrest movement of said yoke in said frame and concurrent movement of said yoke and lever under the influence of said movement imparting means. j 7

' 18. Ina stapler, a stapler head comprising a frame and staple forming and driving parts carried by said frame and including a positively guided slidable yoke and a reciprocable staple driver, and an inverted U-shaped lever having its sides operatively connected with said yoke and its top engage-able with said driver, said lever serving to impartstaple forming, driving and clinching movement tO said yoke and driver.

EDWARD L. SIBLEY.

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