US2508083A - Stripper - Google Patents

Description

May 16, 1950 Filed June 3, 1946 E. WINKLER 2,508,083

STRIPPER 2 Sheets-Sheet 1 Ill y 1950 E. L. WINKLER 2,508,083

STRIPPER Filed June 3, 1946 2 Sheets-Sheet 2 H63. f Q/ 7 Patented May 16, 1950 UNITED STATES PATENT OFFICE 2 Claims. 1

This invention relates to strippers and, more particularly, to apparatus for automatically stripping the waste portions from box-blank portions previously incompletely severed from cardboard blanks.

Among the several objects of the invention may be noted the provision of an automatic stripper for rapidly and efficiently separating the waste portions from incompletely severed boxblank portions of cardboard sheets; the provision of a stripper of this class which separates the waste portions from the box-blank portions by tearing the connections between said portions; the provision of such a stripper which is readily adjustable to strip various sizes of sheets having various box-blank outlines cut therein; and the provision of a stripper of this class adapted con tinuously to convey the sheets to the stripper and to feed the stripped box blanks in one direction and the waste in another direction to a point of disposal. Other objects will be in part obvious and in part pointed out hereinafter.

The invention accordingly comprises the elements and combinations of elements, features of construction, and arrangements of parts which will be exemplified in the structures hereinafter described, and the scope of the application of which will be indicated in the following claims.

In the accompanying drawings, in which one of various possible embodiments of the invention is illustrated,

Fig. 1 is a plan view of the waste stripper of this invention;

.Fig. 2 is a longitudinal vertical section taken through the stripper of Fig. 1;

Fig. 3 is a plan view of a cardboard sheet adapted to be stripped by the stripper of Fig. i;

Fig. 4 is a plan view on a reduced scale of the waste portion per se of the sheet of Fig. 3; and,

Fig. 5 is an enlarged transverse section through the stripper, taken on line 5--5 of Fig. 2.

Similar reference characters indicate corresponding parts throughout the several views of the drawings.

Flat cardboard box blanks which are adapted ultimately to be folded into boxes are conventionally formed by die cutting cardboard sheets on the outlines of box blanks within the peripheries of the sheets. This cutting operation leaves peripheral waste portions of the sheets surrounding the box-blank outline therein. These waste portions are almost completely severed from the box-blank portions of the sheets in the cutting operation but remain connected to the box-blank portions by narrow connecting tongues or bridges.

These connecting tongues result from the provision of narrow recesses or notches in the die cutting blades so that the sheet is completely severed on the box-b1ank outline except in the zones of the notches, where it remains unsevered. The waste has heretofore been separated from the box blanks by stacking a plurality of the sheets and manually beating off the peripheral waste portions with a mallet or hammer. This inefficient manual process is superseded by the stripper of this invention, which provides for automatic and expeditious stripping of the waste from the box blanks.

Referring now to the drawings, and particularly to Fig. 3, there is shown at numeral l a typical blanked sheet adapted to be stripped by the apparatus of this invention. This sheet is rectangular in outline and has been processed by means of a system of cuts extending completely through the sheet on interrupted cut lines 3, each out line 3 being in accordance with the outline requirements of a box blank 5. There are two such systems of cut lines and, consequently, two such box blanks 5. The interruptions in cut lines 3 connote narrow connecting tongues or bridges 'l, which connect the box-blank portions 5 and waste portion 9. The waste portion 9 includes three longitudinally extending waste leader strips ll, l3 and I5 connected at one end by a transverse strip I! (Fig. 4). The dotted lines l9 within the box-blank outlines connote score lines upon which the box blanks are ultimately folded into the form of a box.

Referring now more particularly to Figs. 1, 2

" and 5, the elements of the waste stripper of this invention are mounted in a frame comprisin a bottom member 2|, side frame members 23 and 25, a rearward end member 21 and a forward end frame member 25. An endless conveyor belt 3! passes around belt rolls 33, 35 and 31 journalled in the side frame members. A belt tightening idler roll 39 is adjustably journalled in the side frame members to provide the proper tension on the belt 3|. An idler nip roll 4| is journalled in bearings 43 mounted on the upper edges of side frame members 23 and 25. This roll cooperates with the upper surface of the belt 3! to form means for feeding the sheets forward. The upper reach 45 of belt 3! between rolls 33 and 35 is substantially horizontaLthough the belt slopes slightly upward from nip roll ii to roll 35. The reach #6 of belt 3| between rolls 35 and 31 slopes forward and downward from roll 35. Another idler nip roll 41, journalled in the side frame members, engages the upper surface of the s1op ing reach 45 of belt 3I for a purpose to be described.

An inverted U-shaped bracket 5I has its side legs suitably connected to the side frame mem bers 23 and 25. The bar 53 of the bracket spans the frame between the side frame members and has an elongate slot 55 therein. Secured to the bar 53 are stripping fingers 51 which extend forward and downward from the bar. The forward ends 58 of these fingers are curved around the belt 3I over the belt roll 35. Each stripping finger 5? has an eye 59 at its rearward end. The eyes 59 are disposed on the bar 53 and secured thereto in adjusted position by nut and bolt fastenings 6|. The bolts of these fastenings pass through the eyes and through the slot 55 in the bar 53. The stripping fingers 51, as indicated particularly in Fig. 5, are narrower than the waste leader strips II, I3 and I5 and are positioned on the bar 53 so as to engage and deflect these strips around roll 35 and into the nip of nip roll 41 and belt 3I, but to permit the passage of box blanks 5 between the fingers. A rod 63, suitably secured at its ends to the side frame members, as indicated at 65, is positioned over the ends 58 of fingers 51 to retain them in position against belt 3 I.

Also adjustably secured to the bar 53 by the nut and bolt fastenings 6| are finger 51 having rollers 69 journalled in the forward ends thereof. These rollers are adapted to engage the waste leader strips II, I3 and I5 intermediate the nip roll II and the stripping fingers 51 to prevent buckling of the strips when they engage the fingers 5?. Fingers 61 are provided with slots II in their rearward ends, which are disposed against the bottom of bar 53. The bolts of the fastenings 6| extend through the slots II in fingers 01. The fingers 61 are thus coadjustable with stripping fingers 51.

An endless conveyor belt 13 for conveying stripped box blanks from the stripper passes around belt rolls I5, TI and I9 journalled in the forward ends of the side frame members 23 and 25. justable bearings 83 mounted on the side frame members provides for proper tension in the belt. An idler nip roll 85 is journalled in bearings 81 mounted on the side frame members in position to engage the upper surface of belt 13 between belt rolls 15 and 11. Secured to bar 53 are resilient guide fingers 89 which extend forward and downward therefrom into engagement with the belt 13 over roller I5. The forward ends of these guide fingers guide the stripped 'box blanks into the nip of nip roll 85 and belt 13. The guide fingers are slotted at their rearward ends and are adjustably secured on bar 53 by nut and bolt fastenings 9|. The bolts of these fastenings extend through the slots in the guide fingers and the slot 55 in the bar 53.

A motor 93 is mounted within the frame wi h its shaft extending beyond the side frame member 25. The motor drives a countershaft 95 by means of a belt 91 passing around a small pulley 99 on the motor shaft and a large pulley IOI on the countershaft. The countershaft 95 is coupled to belt roll 31 by a belt I03 passing around Small pulley I05 on the countershaft and a large pulley I01 on the shaft I09 of the belt roll 31. Shaft I 09 is coupled to drive belt roll 19 by a belt III, passing around a pulley II3 on shaft I09 and pulley H5 on the shaft II! of belt roll I9. Belts 3| and I3 are driven clockwise, as viewed in Fig. 2.

A belt tightening roll 8| journalled in ad- A side guide I2I for guiding the side edge of a cardboard sheet I is adjustably mounted upon the upper edge of the side frame member 23. This side guide is supported by slotted brackets I23 and may be locked in adjusted transverse position by nut and bolt fasteners I25, the bolts passing through the slots in the brackets.

Operation of the stripper is as follows:

For stripping cardboard sheets such as shown at I, the stripping fingers 5'! are transversely adjusted upon the bar 53 to positions wherein the forward ends 58 are adapted to engage the waste leader strips iI, I3 and I5. This also adjusts fingers 6'! so that rollers 69 are adapted to engage the strips to prevent buckling. The side guide IEI is adjusted so that when the edge of the leader strip I5 engages it, the cardboard sheet is in such a position that the leader strips I I, I3 and I5 will be engaged and deflected by fingers 51. The operator places a cardboard sheet I upon the reach 45 of conveyor belt 3|, with the edge of leader strip I5 against the side guide I2I, and preferably with the ends of the leader strips forward. The cardboard sheet is then conveyed by the conveyor belt 3| into the nip of nip roll I and the belt 35, which feed the sheet forward. As the cardboard sheet emerges from between the roll 4| and the belt 3! the waste leader strips II, I3 and I5 are gripped between the forward ends 58 of fingers 5? and the belt 3I and thereby constrained to travel on the sloping reach 46 of belt 3|. The box blanks, being unconstrained, travel forward in the direction of the plane path between rollers 69 and the belt 3| The divergence of the paths of travel of the box blanks and the waste portion 9 results in the tearing of the narrow tongue or bridge connections I to separate the box blanks from the waste portion. The ends 58 of fingers 57 direct the waste portion 9 into the nip of nip roll 41 and the belt 3! and the waste is thereby conveyed downward onto the bottom member 2! of the frame for disposal. The box blanks are moved forward until their forward ends are guided by the ends of guide fingers 89 into the nip of nip roll and. belt 13, whereupon the box blanks are conveyed away by the belt I3.

The operator may rapidly place the cardboard sheets I upon the reach 45 of the belt 3| and thereby effect rapid, automatic stripping of the sheets. The forward ends 58 of the stripping fingers 5; function effectively to separate the waste portion 9 from the box blanks 5 by a tearing apart of the connecting tongues 1 between these portions. A wide variety of sizes and configurations of box blanks may be stripped by suitable adjustment of stripping fingers 51.

In view of the above, it will be seen that the several objects of the invention are achieved and other advantageous results attained.

As many changes could be made in the above constructions without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

I claim:

1. Apparatus of the character described, comprising a conveyor belt having a substantially horizontal upper reach and a reach sloping forward and downward therefrom, a nip roll engaging said upper reach and cooperating therewith to feed a. sheet forward along a substantially horizontal path, said sheet comprising a plurality of portions separable upon substantially longitudinal lines, a second nip roll engaging the sloping reach of the belt, and a deflecting finger adapted to guide one of said portions of said sheet onto the sloping reach of said belt and into the nip of said second nip roll and belt, thereby to separate said one portion from the remainder of said sheet and to feed it to a point of disposal.

2. Apparatus of the character described, comprising a conveyor belt having a substantially horizontal upper reach and a reach sloping forward and downward therefrom, a nip roll engaging said upper reach and cooperating therewith to feed a sheet forward along a substantially horizontal path, said sheet including a waste portion separable from the remainder of said sheet along substantially longitudinal lines, said waste portion including a plurality of transversely spaced strips, 3. second nip roll engaging said sloping reach of the belt, and a plurality of transversely spaced deflecting fingers adapted to guide said strips onto the sloping reach of REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 799,624 Beck et a1. Sept. 19, 1905 1,303,680 Kent May 13, 1919 1,401,268 Manischewitz Dec. 27, 1921 1,983,708 Ruble et al Dec. 11, 1934 2,171,769 Stolar et a1. Sept. 5, 1939 Re. 21,718 McFarland et a1. Feb. 18, 1941

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