US2512172A - Staple feed mechanism for stapling machines - Google Patents

Description

Patented June 20, 1950 STABLE FEED MECHANISM Fon s'rArLlNG I MACHINES lllathaniel M. IOlney, New York, N. Y., assignor to Speed lrloductsr Co., Ina, Long Island City, i

N. Y., a corporation l Application June 4, 1946, serial No?. 674,325

This invention is directed to stapling machines and specifically deals with an improved and servceable staple propelling device or follower vin a stapling machine wherein a `magazine appropriately sustains a `strip of wire staples and wherein self retracting manually `controlled `slidably guided plunger means Vis utilized to sever and drive the foremost staple from the stack through suitable sheet material to be fastened. The dominant object of the invention resides in the provision of a novel staplepusher or follower within and shiftabile longitudinally of the staple magazine andhaving spaced and posterior bearings fixedly retaining a fulcrnm pin or stay for desirably maintaining one end of a coiled spring having another end connected tothe cover for the magazine. Another important object is realized in the 'provision 'of means4 to permit quick assembly of one 'end 'of the c'oiled'spring with the staple propelling device orfollower. A further object is to provide a 'simplified follower having spaced bearings for strazddling a terminal coil of the helicoidal spring and for retaining an appropriate pin threaded through the spaced bearings and the terminal coil. Another object is concerned 'with rotatably sustaining the terminal coil on the stay or fulcrum pin. Other important aspects, advantages and functional and structural features of the invention will appear from the following detailed specification considered in the light of the accompanying drawings wherein:

Fig. 1 is a longitudinal and vertical sectional view of a stapling machine showing the slidably guided staple follower according to my invention.

Fig. 2 is a horizontal sectional View on the line 2-2 of Fig, 1.

Fig. 3 is a transverse sectional view on the line 3--3 of Fig. 1.

Fig. 4 is a fragmentary perspective View of Fig. 1, however illustrating the swingable cover in a partially opened position relative to the staple carrying magazine.

Fig. 5 is a perspective view of the follower, and

Fig. 6 is a perspective View of the slotted staple supporting rail.

The stapling machine generally designated S is characterized by the magazine M appropriately carrying the xed rail R on which a strip of :vire staples W are slidably guided. rEhe vire staple strip is of the conventional inverted U-shaped form and foremost staple as il! is adapted to be ejected through a vertical staple guideway 0r gap ll' between the front wall I2 of thecover C and front face l 3 ofthe rail by a verticallyslida'bly guided blade fill of the spring controlled vertically and. slidably guided driver s. D having" attached 'thereto the manipulatable head l5. y Attached: tothe driver and cover is a normally contracted Ybut extendible helicoidal spring I3 'for nor-mall'yfholdingthe driver elevated. f

'The cover C is pivotally mounted on 'the fulcrum pin P Icarried by the magazine M. 'Also pivoted on the `cover are the spaced upstanding lugs I1 projecting from the bas'eVB carrying the anvil A which is provided lwith suitable clinching'indent I8.4 v

slidably guided by the cover is the latch L having themanipu'latable Wings le extending laterally of the cover C.

Trained about the slidably guided latch L is the helicoidal spring "2| having one end fastened to alug 22 extending from the cover C.

A -pivoted clearing lfatch12'3r is yielding-ly sustained on the free end of the leaf spring 26'; having its anterior end secured by a rivet 25 to the base B. The clearing latch is adapted to removably project into opening 2t to removably interlock with the bottom' wall of the magazine.

The slidably guided latch L removably interlocks with the .fwalls of the transversely alined notches 2l in the spaced wings 28 projecting upwardly from the sides of the magazine M.

The foregoing structure is more particularly set out in United States Letters Patent 2,311,643, issued to Stephen A. Crosby February 23, 1943.

According to the invention an inverted U- shaped staple propelling device or follower F is slidably mounted on the fixed rail or support R. Specifically the follower has its depending sides 30 slidably arranged in the longitudinally disposed and spaced staple guide channels 3| formed by the sides of the cover and the sides of the magazine.

Anchored to the top wall 32 of the staple follower or pusher F is the rivet 33 having an enlarged cylindrical portion 34 slidably guided in the elongated longitudinally disposed rectilinear slot 35 in the top wall 36 of the rail.

Cooperating with the underface of the top wall 3S is a relatively enlarged head or liange 3l to preclude involuntary separation of the follower from the rail.

The posterior end of the slidably guided staple follower is provided with the transversely alined spaced ears o1 bearings 3B adapted to straddle terminal coil or eye 39 of the helicoidal spring 2 I. It will be observed that the terminal coil 39 is bent substantially normal to the body of the spring 2l.

A cylindrical fulcrum pin or stay 40 is threaded through the bores of the transversely alined bearings 38 and through the opening in the terminal coil 39. This fulcrum pin has its ends appropriately Xedly anchored to the ends of'.

the bearings 38 to preclude dislodgement thereof. By the arrangement disclosed, the terminal coil is rotatably sustained by the fulcrum pin and has adequate play to shift therealong in the matmeans carried by said bearing means and threaded through 4and rotatably surrounded by 1': :said'terminal coil.

ter of opening or closing of the magazine by the swingable cover.

On pivotally opening of the cover the lower' leg 4I of spring 2I retracts the follower towards the rear of the magazine to permit mounting of av y p staple strip on rail R. On closing of the cover n leg 4I urges the follower forwardly consequently driving the staple strip forwardly to present the foremost staple under the raised staple ejeoting blade I 4 of the driver D which if depressed causes the blade I 4 to shift the foremost staple through the vertical guideways I I, through the sheet material (not shown) to be fastened and against the indentations I8 of the anvil for elinching the ejected staple in a manner well understood.

Of course when the driver D is depressed spring I6 is elongated and upon removal of manual pressure on the head l5 the driver automatically retracts to position its blade I4 above the rail as indicated in Fig. 1 awaiting to again sever a foremost staple of the staple strip.

Various changes may be made in the details of construction and arrangement of parts without departing from the spirit of the invention or sacrificing any of the advantages thereof inherent therein.

I claim:

1. In combination, a staple magazine having a rail including a longitudinally disposed slot, a staple follower comprising a top wall and spaced v`2. In combination, a staple magazine having a rail ,including a longitudinally disposed slot, a l5 staple follower comprising a top wall and spaced depending sides moya-bly straddlng said rail, pin

- means securedzto and depending from said wall and having a portion slidably guided by the Walls of 'said slot, a head carried by said pin means and coacting with said rail to preclude separation of said follower from said rail, spaced and hollow bearing means integral with and extending from the posterior portion of the wall of said follower, a helicoidal spring having a terminal coil interposed between said bearing means, and fulcrum stay means carried by said bearing means and threaded through and rotatably surrounded by said terminal coil.

NATHANIEL M. OLNEY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS

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