US2070767A - Staying machine - Google Patents

Description

Feb. 16, 1937. I, LLW-I MER 2,070,767'

STAYING MACHINE Filed July 10, 1935 2 Sheets-Sheet l //VV/V/'0R W/f/VESS lznzuaaa Z. MSW) @L EV 'Feb. 16, 1937. L; L.. Wl'sMER 6 STAYING MACHINE Filed July 10, 1935 1 2 Sheets-Sheet 2 mr/ysss; A 1 A M32770" v i I C Patented Feb. 16, 1937 UNITED STATES PATENT OFFICE STAYING MACHINE Application July 10, 1935, Serial No. 30,753

2 Claims.

This invention relates to a staying machine and has particular reference'to such machines adapted for the application of metal stay strips to the box edges.

Machines of the general type to which the invention relates are illustrated in, among others, U. S. Patent 793,549, issued June 2'7, 1905 to Stokes; U. S. Patent 1,192,201, issued July 25, 1916 to Jackson and Horton; and U. S. Patent 1,346,573, issued July 13, 1920 to Walz and Morris. Since the general arrangement of the parts of such machines and their operation is well known and since the present invention relates primarily to details of the mechanism for severing the metal stay strip in the operation of such staying machines, only so much of the complete machine will be described as is necessary for an understanding of the invention.

In box-staying machines of the character referred to, a V-shaped die carried on a vertically reciprocating cross-head acts in cooperation with a V-shaped anvil upon which the box edges are placed to fasten the metal stay strip to the box edges. The die has heretofore been provided with a V-shaped knife fixed thereto and cooperating with a ledger blade formed by the edge of a slot in a cutter slide arranged to reoiprocate relatively to the die. Normally this .slide is held in a lowered position by the action of springs and as the die descends in the operation of the machine and approaches the anvil the metal stay strip, fed through the slot in the slide, is cut oil by the descent of the knife relative to the slide which is held against further movement by engagement with the anvil. Since the knife is necessarily V-shaped in conformity with the shape of the die to which it is fixed, while the lower edge of the slot in the cutter slide is straight, it is apparent that there will be a certain amount of deformation of the metal stay strip when it is cut by the opposing action of the knife and the edge of the slot in the cutter slide. The deformation usually results in a bending of the metal stay strip adjacent its severed edge and this bending is usually sufficient to prevent the severed end of the stay strip from being properly clinched into the body of the box to which it is to be attached.

In accordance with the present invention an improved cutting mechanism is provided for the die by means of which the metal stay strip is severed by the opposing action of a knifewith a straight edge cooperating with the straight edge of the slot in the cutter slide and accordingly without deformation of the metal stay strip.

The accomplishment of the objects of this invention will be apparent from the following detailed description read in conjunction with the accompanying drawings of a preferred embodiment of applicants invention. In the drawings:

Fig. 1 is a fragmentary side elevation of a box-staying machine embodying this invention.

Fig. 2 is a detailed view of a metal stay strip used in this type of box staying machine.

Fig. 3 is a detailed view showing the position of a severed portion of stay strip relative to the die of the box-staying machine,

Fig. 4 is a fragmentary side elevation of the die provided with cutting means in accordance with this invention.

Fig. 5 is an end elevation of the same.

Fig. 6 is a fragmentary elevation, partly broken away, of the structure shown in Fig. 4 showing the parts in a diiferent operating position.

Fig. '7 is an end elevation of the same with the retaining plate for the cutter slide removed.

Fig. 8 is a fragmentary sectional view of the structure shown in Fig. 4 showing the parts in still another operative position; and

Fig. 9 is a vertical section taken on the plane indicated at 99 in Fig. 8.

Referring to Fig. 1 which indicates the boxstaying machine as a whole, it will be seen that the machine comprises a frame I in which is mounted driving means (not shown) having a crank connection with a link 2 which serves to actuate the device for cutting and handling the stay strip. There are indicated specifically only a few of the parts, for example, the die 3, the cross-head 4 and the anvil 33, inasmuch as most of the parts are conventional and well known and are illustrated in the patents referred to above.

Referring to Figs. 4, 5, 6, 7, 8, and 9, there is illustrated the arrangement for severing the metal stay strip in accordance with this invention. The die 3 is provided in conventional manner with a cutter slide 1 which is urged downwardly by the springs 9 to a limiting position determined by a stop pin II and which is furnished with a slot l3 through which the metal stay strip 5 passes from the feed and whose lower edge cooperates with the knife in the cutting operation. The slide 1 is held in position in its guide-way in the die 3 by a retaining plate I 5, which is slidable outwardly on the studs [9 and is pressed inwardly into position by the strong springs I! reacting between it and the heads of the studs.

In place of the usual fixed V-shaped knife, however, there is provided in accordance with this invention a knife 2| provided with a V- shaped notch 23 corresponding in shape to the V-shaped recess of the die 3, in its lower edge and a recess in its upper edge. The knife 2| is arranged to reciprocate horizontally in relation to the die 3 and is guided in this motion by a pin 2'! acting in a slot in the die. The vertical movement of the cutter slide 1, during the operation of the staying machine, is transmitted by means of. the stop pin H to the rocker arm 29 which pivots on the pin 3| to the knife blade 2|.

The operation of the cutting mechanism can best be described with reference to a single reciprocatory motion of the die 3. In Figs. 4 and 5 the die is shown with the parts in the positions occupied at the top of the upward stroke. The cutter slide 1 is in its extreme downward position under the influence of the springs 9 and the knife blade 2| is in its extreme rightward position under the action of the rocker arm 29. A strip of metal stay is then fed through the opening I3 in the slide 1 and the die 3 begins its downward motion. The cutter slide I soon engages the anvil 33 and is pressed upward into the position shown in Figs. 6 and 7. The metal stay strip 5 is now positioned between the lower edge of the'slot l3 in the cutter slide and the edge of the knife blade 2| which is still in its rightward position. The continued descent of the die 3 severs the metal stay strip cleanly between the straight edges ofthe knife blade 2| and the cutter slot 13 and at the same time through engagement of the rocker arm 29 with the stop pin ll moves the knife blade 2| to its leftward position as: shown in Figs. 8 and 9, in which position the V-'slot 23 in the knife blade coincides with the V of the die 3. The continuedde'scent of the die 3 .then bends the stay strip 5 and effects the insertion and. crimping of the prongs of the stay strip inthe box which is placed on the anvil 33. 7 Upon the upward motion of the die 3, the cutter slide 1 is urged downwardly by the springs 9 and the pin I I engages the opposite'arm' of the rocker 29 to move the knife blade to the right and back into the position shown in Figs. 4 and 5.

It will be seenthat there has been provided in accordance with'this invention means for severing the metal stay strip without. any distortion thereof, which severing means nevertheless do not interfere with the action of the die in bendingthe stay strip about the box corner to which it isto' be attached. It will be understood that variations from the particular procedure described above may be effected without departing from the scope of this invention.

What I claim and desire to protect by Letters Patent is:

1. In a staying machine a stay cutting and fastening mechanism including a V-shaped die having cooperating cutting elements movable vertically relative to each other attached thereto, one ofsaid elements comprising a horizontally movable knife blade set in a recess in the face of said die with the upper edge thereof abutting over, its entire extent and at all times the shoulder of said recess, said knife blade having a straight cutting edge and a V notch conforming to the shape and forming an extension of the die disposed horizontally of each other on its lower portion; and means whereby the relative movement of. the cooperating cutting elements will cause first the cutting edge and then the V notch of said knife to be presented for operation, said last named means including a rocker arm pivotally mounted on said die and engagingfiaid knife blade and a stud carriedv by' theother of said cooperating cutting elements and. adapted to engage the rocker arm uponrelativef'niove ment" of said cutting. elements;

21 In a staying machine a stay cutting and fastening mechanism including a V-shaped 'di'ej'f having cooperating cutting elements'fmov'able vertically relative to each other attachedthereto, one of said' elementsbomp'rising, mazontally movable knife blade setin a recess in the face of saiddie with theupper dgethereof abut; ting over its entire extent and at'all timesthe. shoulder of said recess, said knife "bladehaving'. a, straight cuttingedge and a V notch conforming, to the shape and forming an extensionof'the die disposed horizontally of eachother on its. lower portion, guiding means positioned on said die and said knife blade to direct. the'movenient of the latter along a true'horizontal path. and means whereby the relative movement of, the cooperating cutting elements will cause first the cutting edge and then the V notch of said knife tobej presented for operation, said last named means including a rocker arm pivotallymounted on said die and engaging said knife blade and a stud car; ried by the other of said cooperating cutting elements and adapted to engage the rocker 'arfm upon relative movement of said cuttingelement's."

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