US1735195A

US1735195A - Stapling device

Info

Publication number: US1735195A
Authority: US
Publication date: 1929-11-12
Anticipated expiration: 1946-11-12

Description

J. 5.A BATES sTAPLING DEvIcE Filed sepan 20, '1928 v 2 sneet-sheet 1 Nov.l2,l92& 4'.LaATEs STAPLING DEVICE Filed sept. zo. 192e 2 sheets-sheet 2 Patented Nov. 12, 1929 JESSE G. BATES, F CHICAGO, ILLINOIS STAPLING DEVICE Application filed September 20, 1928. Serial No. 307,198.

10 for feeding the staple strip step-by-step to the plunger, to provide a ,feeding mechanism of this kind which will secure the forward staple against tilting during its movement to the plunger; to provide improved means for securing the staples against backward movement in their guideway; to provide an improved form of gate for limiting the forward movement of the strip; to provide a gate of this kind which is retractable to permit lthe entire strip of staples to be readily withdrawn from the machine; and to provide a stapling device having an improved form and arrangement of'parts whereby the last staple in astrip is automatically ejected, unused, from the machine after the preceding staple has been acted upon by the plunger.

An illustrative embodiment of this invention is shown in the accompanying drawings, wherein Figure 1 is a side elevation, partly in section, of a stapling device to which this invention is applied, part of a staple strip being also shown.

Fig. 2 is a front elevation of the same, part of the plunger handle being broken away.

Fig. 3 is a bottom plan of the same.

,Fig 4 is an enlarged sectional detail showing the position assumed by the last staple of A Y a strip as it is ejected past the gate, the View being taken on the line 4-4 of Fig. 2.

Fig. 5 is a fragmentary section taken on the line 5--5 of Fig. 2.

Fig. 6 is a fragmentary perspective of the,

plunger. n

Fig. 7 is 'an enlarged perspective of the feeding element.

Fig. 8 is an enlarged perspective of the supporting and guiding means for the strip of staples.

V Fig. 9 is a sectional detail taken on the line 9-9 of Fig. 8 and showing the means for securing the staples against backward movement. v

Fig. 10 is a fragmentary side elevation of the device showing the gate open and a strip of staples partially withdrawn. y

In the construction illustrated, the improved stapling device comprises asupport 1, having a guideway 2 for supporting and guiding a strip of U-shaped staples 3, which are severed and driven into the work by a plunger 4, to which the strip is fed by an improved feeding mechanism 5.

The support 1 is preferably a metal casting comprising a base 6 and head 7 having an in tegral handle 8.

The improved guideway 2 includes a chann nel 9 in which is located a rail 10 for supporting and guiding the strip of staples. .The

channel 9 is formed in the base part 6 and is.

'coeXtensive therewith. An inlet opening 11 at the rear end ofthe channel permits the insertion of the staple strip and an outlet open- .ing 12 at the forward end of the channel permits the withdrawal of the strip if desiredI and also permits the ejection of the last staple as hereinafter described.

The guide-rail 10y is `located in the forward part of the channel 9 and is rigidly secured to the base 6 by rivets 13 or other suitable fasten-A ing means.

In the form shown, the rail 10 includes a bar 14 on which is rigidly mounted a cutter plate 15.. By making the bar 14 and plate 15 in two parts, it is not necessary to harden the 'entire rail. The plate 15 is made of hardened steel and the bar 14 may be a die casting.

The plate 15 supports the staple strip and, therefore, is slightly narrower than the staples so as to permit the strip to slide free-- ly. The upper part of the bar 14 is reduced in cross section so as to provide passages 16 for the prongs of the staples. The rear end of the l rail 10 is tapered, as shown at 17, to facilitate the insertion of the staples. Y

Formed on opposite sides of the bar 14, adjacent the forward end thereof, is a pair of recesses 18, through which dust or other foreign particles may be expelled from the guide- Way. l

, gage'thje Cam plate 35.

Mounted on the rail adjacent the forward end thereof, is a detent mechanism arranged to secure the staples against backward movement. 1n the form shown, the (le rent mechanism includes a pair of detents located on respectively opposite sides of the bar 14,.a11'd having their rear ends pivotally secured thereto by pins 20.

The detente are normally urged outwardly int-o engagement with the'y prongs of the staples 3 by a spring 21 which extends through a transversely disposed opening.- 22` formed in the bar 14. By engaging the prongs of the staples, the detentel 1'9"' positively secure the staples against any backward tilting' during the detraction ofthe feeding mechanism 5", as hereinafter described.

The plunger 4 is slidable in a guideway' 23, formed in the head 7, and is provided with a cutting edge 24 adapted to coact with the forward edge' of the plate 15 for severing the foremost staple from the strip. The lower end of the plunger is adapted to drive the severed stapleI through a guideway 25 extending substantially normal tothe guideway 2.

Mounted on' the outer end of the plunger 4,y is a knob 26 and, loosely embracing the plunger, is a cup' shaped' washer 27 which bears against the head 7.

Bearing between the knob 26 and washer 27, is a spring 28, which normally retracts the plunger tol its inoperative position, as shown in Fig'. 1. The plunger is secured against withdrawal from the head 7 by a pin 29 extending transversely throughl the head in position to engage a shoulder 30 formed on the plunger.

In the form shown, the improved feeding mechanism 5 comprises a pawl 31 located in the rear' part of the guideway 23 and pivotally secured to the head 7 by a pin 32.

The lower end of the pawl 31 *is formed so as to be adapted' to straddle the guide-rail 10' and is provided with a pair of spaced fingers 33 adapted to engage the two prongs of a staple for feeding the strip forwardly in a step-by-step movement. By engaging the two prongs ofv the staple, the pawlf'31 secures the staple against any tilting during the forward movement. i v

The pawl '31 is moved forwardly, for feeding the staples', under the action of a spring 34 which embraces the pin 32. OneA end of the spring 34 engages the wall of the head 7 andthe other end thereof bears against an` inclined cam plate 35 formed on the pawl.

The backward stroke of the feed pawl 31 is positively limited an adjustable screw 36 mounted in the head 7 and positioned to en- Tlije cam plte 3,5A "s located in the path of the shoulder 30 so that upon the operative stroke of4 the plunger, the pawl 31 is retracted for engagement with another staple.

The forward movement of the strip of staples is limited by a gate 37, which eomprises a resilient arm 38 pivotally secured to the head 7 by a pin 39. The free end of the arm' 38 is bent to provide a shoulder 40, which is adapted to be seated in one side of the' outlet 12 for preventingkr the withdrawal of' the strip. The shoulder 40 is provided with a: project-ion 41 adapted to enter a recesss- 42 in the base 6 for securing the gate against accidental withdrawal.

Y .Tine arm 38 is slightly bent, as shown at V43, so that the free end thereof must be pressed toward the base @before the shoulder can enter the opening 12.

The gate 37 obstructs one side of the outlet 12 and therefore makes it impossible tov remove tlie strip of staples without retracting the gate, as illustrated in Fig. 10'. However,

when only one staple is left, it is ejected past the gate in the manner indicated in Fig. 4.

In operation, a strip of staples is placed in the guideway 2 and moved forwardly until the foremost staple engages' thev shoulder 40 of the gate. 4, the foremost staple Vis vsever-'ed from the strip' and` driven through the guideway 25 into the work operated upon. During the depression of the plunger, the shoulder 3() moves the feed pawl 31 rearwardly to permit the fingers 33 to engage the prongs of another staple.

During the retraction of the feed pawl 31, the staples are secured against backward movement by the improved d'etents 19. Upon the return stroke of the plunger, the pawl 31 is actuated by the spring 34 for feeding the staples one step forwardly.

r1`he springl 34 is arranged so as to enablev the pawl 31 to exert considerable pressure on" the staple strip and', therefore, if the gate 37 were open during the forward movement of the pawl, the forward end of the staple strip would be projected through the outlet 12 beyond the guideway 25 by` the catapulting action of the-pawl 31.

As long as the gate 37 is closed it is impossible for two connected staples to pass beyond the guideway 25 because, in order to pass the gatel 37,itis necessary that the' staple shift to a diagonal position, as shown in Fig.

' 4. Theeutlet opening 12 is not of sufficient width topermit two connected' sta-plesto turn diagonally therein and, therefore, when the gate 37 is closed th-e foremost staple o-f the 9' strip stops in alinement with the guideway 25.

After the next to the last staple is driven through the guideway 25, the feed pawl 31 ejects the last staple through the opening 12' in the manner illustrated in Fig. 4.

The last staple of theI strip is alwayswasted in any type of stapling device but, with the devices heretofore in use, the last staple has merely Afallen out of the same opening' By depressing the plunger through which the preceding staples were driven.y With prior devices, the last staple frequency became caught in the outlet and clogged the machine.

loggingof the machine is avoided in devices embodying this invention because the last staple of each strip is automatically ejected through the outlet l2.

Although but one specific embodiment of this invention has ben herein shown and described, it will be understood that numerous details of the construction shown may be altered or omitted without departing from the spirit of this invention as defined buv the following claims.

I claim:

l. A stapling device comprising a support, a guideway on said support for a strip of staples, said guideway having an outlet at one end in prolongation thereof, means for severing the foremost staple from the strip, and mechanism for feeding the strip along said guideway to said severing means, said feeding mechanism being adaptedv to throw the last staple of the strip to eject same through said outlet after the preceding staple has been severed.

2. A stapling device comprising a support, a guideway on said support for a. strip of staples, said guideway being open at one end for the insertion of the strip, means for severingthe foremost staple from the strip, and mechanism for feeding the strip to said severing means, said guideway having an outletopening at its opposite end in prolongation therof, said feeding mechanism being adapted to throw the last staple of the strip to eject same through said outlet after the preceding staple has been severed.

3. A stapling device comprising a support, a guideway on said support for a strip of staples, said guideway having an outlet at one end in prolongation thereof, means for severing the-foremost staple from the strip, mechanism for feeding the strip along said guideway to said severing means, and a stop `in said outlet for limiting the forward movement of the strip, said feeding mechanism being adapted to throw the last staple of the strip to eject same through said outlet.

4l. A stapling device comprising a support, a guideway on said support for a strip of staples, said guideway having an outlet opening at its forward end in prolongation thereof, means for severing the foremost staple from the strip and driving it in a direction substantially normal to the strip, mechanism for feeding the strip along said guideway to said severing means, and a gate located in said outlet for limiting the forward movement of said strip, said gate being retractable to permit the stripto be withdrawn through said outlet, said feeding mechanism being.

adapted to throw the last staple of the strip to eject same through said outlet.

5. A stapling device comprising a support, a guideway on said support for a strip of staples, said guideway having an outlet opening at its forward end in prolongation thereof, means for severing the foremost staple from the strip and driving it in a direction substantially normal to the strip, mechanism for feeding the strip along said guideway to said severing means, and a gate located in said outlet at one side thereof for limiting the forward movement of said strip, the opposite side of said outlet being unobstructed to permit the ejection therethrough of the last staple of the strip.

Signed at Chicago this 15th day of September, 192s.

JESSE G. BATES.