US1502346A - Staple-driving machine - Google Patents

Description

v J. MUTH STAPLE DRIVI NG MACHINE!- Filed Nov. 10 192) IllLf Patent duly 22, lgd.

JOHN MUTE, OF NORWALK, CONNEG'JEICU, ASSIGNOB TO Tm 'E E. HOT r=i ist @H- PANY, OFNORWALK, CONNECTICUT, A CORPORATION 0F CONNECTICUT.

srnrnnlnnrvms CHINE.

, Application led November 10, 1921.

To all whom t may concern.'

Be it known that I, JOHN Morir, acitizen of the United States, residing at Norwalk, county of Fairield, State of Connecticut,

have invented an Improvement in Staple- Drivin Machines, of which the following is a speci cation.

This device relates to staple driving machin'esl and more particularly to that type lmown as staple strip machines wherein each staple at the time it is driven is severed from a strip of integrally connected staples which is fed forwardly at each operation of the machine to bring the staples successively into a position to be driven."

A. particular object of the invention is to provlde improved and positively operating means, operating from above the staple strip, to straighten out a staple should it be 29 bent out of position prior to the severing o eration, sothat it will be properlypositloned for severing and' driving. j

A further object of the invention is to provide improved means for holding each'staple a's it is severed from the strip, to prevent its turning during the severing operation, to guide the staple aft-er it has been severed to prevent its turning and Wedging in the throat of the machine, to prevent clogging .of the machine, and to insure straight driving of each staple. j i

A still further object of the invention is to so mount the staple straightening means and the staple strip feeding mechanism, that they may be assembled outside ofthe casing with the guiding rail for the staple strip, and the entire mechanism, as a unit,lthen inserted in the casing.

With the foregoing andI other objects in view l. have devised the improved mechanism illustrated in `the .accompanying drawings, in which f Fig. 1 is a vertical, longitudinal section through the casing of the machine showing 15 the mechanism in elevation, the casing being raised for the insertion of the articles to be connected. I

Fig. 2 is a view similar to lg. l showing the casing in its lower position.

@il Fig. 3 is a perspective view of the guidin rail for the strip showing vmy improve v staple means applied thereto.

Fig. 4 is a vertical, transverse sectional view substantially on the line 4 4 of Fig.

Serial No. fel.

Fig. 5 is a similar section substantially on Y the line 5 5 of Fig. 2 and looking in thel direction of the arrows, and

Fig. 6 is a sectional plan view of the fore part of the machine and substantially on the line 6 6 of Fig. 2 looking in the direction of the arrows.

The base 10 of the machine is provided, adjacent one endthereof, with vert1cally extending spaced ears 11 between which is pivoted at 1l the staple strip guiding bar or rail 12 and casing 13. The bar 12 may, if desired, be the usual solid bar, but l prefer to form it of sheet metal, the mid-section forming the top 14, the sides being bent -downwardly to form the vertical legs 15, and the lower edges then being bent upon themselves at 16, making the bar of substantially inverted U-shape 1n cross section, the upwardly extending portions 16 providing spacing means for other elements secured toI the bar, to allow clearance for the passage of the staple strip along the bar. It is preferred that the rear 0r inlet end of the bar be tapered, as shown at 17, to facilitate inlsertion of the strip and also to straighten out any free arms 18 of any staple which may be benttoward each other on the strip, and to thus properly position the same ony opposite'sides of the bar. At the forward end of the base is mounted the usual anvil 19 provided with the clinching recesses `20 on the upper side thereof. Adjacent the rear end of the anvil may be mounted adjustable fingers 21 to act as edge guides to facilitate proper positioning of the articles to be connected upon the anvil.

'In the forward end or head of the casing are formed vertical guideways 22 for the plun er 23, this plunger sliding vertically in theseg, ways, and being substantially H- shaped in cross section, as shown in Fig. 6. It is provided at its upper en with a disc or knob 24 secured thereto by any suitable means such as a screw, not shown, and is surrounded by a coil spring 25 resting at its opposite ends against the top ot the "casing and the under side of the knob, and tends to hold the lunger in the elevated shown in igs. 1 and 2.

The casing is vof substantially inve -U-shape in cross section, asshown in Figs. 4 and 5, and is adapted to receive the iceding and other operating mechanism. Se-

position, as

' 2 lookin in the direc' tion of the arrows;` cured adjacent the forward end of the bar ll@ l 12 is a yo`ke 26 having spaced legs straddling the bar and secured thereto b any suitable means such as a pin or rivet 2 These legs are on the outer surface ofk the upwardly extending portion 16 of the bar 12, so that theyare spaced from the sides 15. Pivotally mounted at 28 in the yoke is a camplate 29 having two forwardly projecting cam-lugs 30 and 31, and carrying at its lower end a staple strip feeding pawl 32, which straddles the lower end of the plate and is pivoted thereto by means of a pin 33, the free ends 34 of this pawl being adapted to rest on the top of the bar 12. Connected to the yoke joining the two sides of the pawl, is a spring 35 connected at its opposite end to a lug 36 on the cam-plate 29. This spring tends to turn the feeding pawl on its pivot and hold the free ends thereof in' contact with the top of the bar 12 and between the staples of the strip. Connected adjacent the top of the cam-plate isa second spring 37, this spring being .also connected with a rearward extension 38 on the yoke 26. -This spring tends to move the lower end of Vthe cam-plate forwardly to provide a' feeding movement to the staple Strip. Coacting with the cam-lugs 30 and 31 on the cam-plate is a lug 39 carried by the plunger, this lug being preferably formed on a plate of considerable thickness set into the rear of the plunger, and having a vertically extending elongated opening 41 through which extends a pin 42 on vmi the yoke which acts asa limit strop forthe plunger.

lPivotally secured to the bar 12 is the staple straightening and holding device 43. As will be noted from the drawings, this device extends longitudinally of the bar above the staple strip, and is provided at its rear end with downwardly extending spaced legs 44 which straddle the bar and are pivoted thereto by means of a pin 45. These legs are on the outside of the 'upwardly bent portion 16 of the bar 12 so that they are spaced from the sides 15 of the bar to provi e clearance for the passage of the staple strip. These legs are each provided with a rearwardly extending lug 46 extending into a recess 47 inY upwardly extending members 48 secured to the base 10. The member 43 is provided at its forward end with downwardly extending fingers 49 on opposite sides of the bar 12 at the forward end thereof, and are s aced apart transversely of the bar substantially the same distance as the downwardly projecting arms 18 of a staple, and are so located that when they are in the lower position shown in Fig. 2 they will come between the arms of the two end sta les, the end staple 50 being in position to e cut of and drivenby the plunger. In this position the arms of the end staple 50 are in the rearward guideways 22 below the lower end of the plunger between the ribs 51 and the forward 'end of the fingers 49.. The horizontal portion 52 of the fingers 49connecting these fingers with the member of the body 48 are provided on the under edges thereof with downwardly extending non-return lugs 52, which engage the second staple from the end, or any other staple if desired, to prevent backward movement of the staple strip during the severing operation, or under action of the feed pawl 32 when it is moved backwardly to feeding position by the action of the lug 39 on the lug 31 of the cam-plate.

. The operation is as follows:

When the forward'end of the casing 10 and bar 12 are raised, as shown in Fig. 1, to allow insertion of sheets of paper 53, or other articles to be secured together, on the top of the anvil 19, as the members 48 are located forwardly of the pivot 11, these members pull on the lugs 44 and turn the staple straightening member 48 about its pivot 45raising the fingers 49 thereof above the top of the staple strip, as shown in Fig. l. Downward movement of the forward end of the casing causes the members 48 to force the lingers 49 downwardly between the arms of the forward or end staple 50, and next adjacent staple on the strip, and should the arms of the forward staple be bent inwardly toward the endLr of the next adjacent staple, they will be forced outwardly. to the vertical or .proper position by the action ,of the fingers 49, so that this staple will be properly positioned in the rearward guide 22 below the lower end of the plunger for the severing and driving operation. If a blow is now'struck on the top of the knob 24 forcing the plunger downwardly, the cutting edge 54 on the lower end of the plunger coacting with the cutting edge 55 on the forward end of the bar, will sever the staple 50 from the strip, and further movement of the plun er will drive the arms thereof through the s 'eets of paper 53, and they will be clinched on ,the under side thereof by the curved recesses in the anvil in the usual manner. It will be noted that in its movement from the position shown in Fig. 2, until the ends of the arms of the staple engage the top of the paper, that the staple is gulded between the ribs51 and the fingers 49, so that there is no opportunity for them to be bent backwardly during the severing operation, or to move out of the proper positlon for clinching, thus insuring a reliable severing and clinching of the staple, and obviatingv the Downward movement of the staple in the driving Operation will, adjacent the lower e'iid of this movement, bring the lug 39 carriedthereby into engagement with the camto assist the s ring 37 in moving) lug 31, forcing the lower end of the camplate 29 backwardly and with it feeding pawl 32, so that the free ends of this pawl engage behind the next staple to the rear. Movement of the plunger upwardly under the action of the spring 25 will bring the lug 39 in contact with cam-lug 30 and tend/ the feed pawl and stap e strip forwardly, ut as the arms of the next staple are behind the iingers 49, the staple strip cannot move forwardly and bring the staple beyond the end of the bar 12 to proper severing and driving position until the lingers 49 have been raised, as described above, by raising of the forward end of the casing and bar 12 to the position shown in Fig. 1. It willbe neted that with the use of this mechanism the end staple is always properly positioned for the severing and driving operation, even thou h it may have been bent on the staple strip when it was inserted in the machine, obviating clogging of the machine and also preventing wastage of staples.

lt will be apparent from an inspection of the drawing, that the elements of the mechanism are so mounted that they may be assembled on the bar 12, then inserted as a unit in the open lower end of the casing, and secured therein by pins or rivets 56 passing through the bar 12 and the sides of the casing. As all the movable elements, with the exception of the plunger, are secured to the bar 12, the pin 42 is inserted in the slot 41 of the plunger, and the plunger is inserted in the casing from the lower end thereof at the same time as is the bar 12 carrying the staple feeding and straightening mechanism.

The spring 25 is then applied over the up-v per projecting end of the plunger and the ob 24 is secured in position. The whole mechanism is then pivotally mounted between the ears llof the base by means of the pivot pin 11 passing through these ears and the bar 12.

Having thus set forth the nature of my invention, what l claim is:

1. ln a stapling machine, in combination, a staple strip carrying bar, a staple strip feeding meansfa pivoted staple straightening device above the staple strip provided with downwardly extending lingers, .and means for forcing said fingers between the arms oftwo adjacent staples to straighten the same on the strip.

2. ln a stapling machine, in combination, a staple strip carrying bar, a staple strip ,feeding means, a staple straightening device pivoted to the bar and extending above the strip, said device including downwardly pro]ecting fingers adjacent the forward endl of the bar, and means for forcing the fingers between the free arms of two adjacent staples to straighten the same on the strip.

3. In a stapling machine, in combination,

feeding means, a staple straightening de-l vice ada ted for insertion between the two end stap es on `the strip to straighten the same, and means operated by movement of the bar on its ivot for operating said strai htening device. f

d. a stapling machine, in combination, a base, a staple strip carrying bar pivoted to saidbase, a staple straightening device above the bar and provided with arms straddling the bar and pivoted thereto, said device provided with iin ers "adapted for insertionbetween two adjacent staples on the strip to straighten the same, and means on the base coactingIl with the straightening de vice to swing t e 'same on its pivot upon movement of the bar on its pivot.

5. In a stapling machine, in combination, staple strip feeding mechanism, staple severing and ldriving mechanism, and means for holding the foremost staple on the strip against turning during the severing operation, comprising a pivoted member extending above the strip and having downwardly extending fingers adapted to be inserted between the foremost and next adjacent staple.

' 6. In a stapling machine, the combinatlon with a staple strip carrying bar, means for feeding a sta le strip and means for severing yand vdriving the individual staples, of lmeans for en a ing the foremost staple on the strip and o ding the same against turning during the severing operation comprising a member extending above the strip and pivoted to the bar and having downwardly extending fingers to engage said sta le, and means for moving said member a ut its pivot. C

7. ln a stapling machine, the combination with a staple strip carrying bar, a staple severing and drivmg plunger, staple strip feeding means comprising a yoke secured to the bar, a cam-plate pivoted in the yoke, a yielding feed pawl on the cam-plate, and means on 'the plunger cooperating with the cam-plate to oscillate thee.

8. in a stapling machine, the combination with a staple strip carrying bar, a staple severing and drivmg plunger, staple Strip feeding means comprising a yoke secured to the bar, a cam-plate pivoted in the yoke, a yielding feedpawl on the cam-plate, means on the plunger cooperating with the camplate to oscillate the same, and staple straightening and holding means com rising a pivoted member having downwardly d1- rected fingers adapted to engage the foremost staple on the strip and straighten and hold the same during the severing o ration, and means for operatin said memhgr.

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