US2301566A - Cutting mechanism - Google Patents

Description

Nov. 10, 1942.

L. A, MOORE CUTTING MECHANISM Original Filed Sept 23, 1940 Patented Nov. 10, 1942 UNITED STATES rarest OFFICE CUTTING MECHANISM Original application September 23, 1940, Serial Divided and this application September 19, 1941, Serial No. 411,522

3 Claims.

This invention relates to cutting mechanism for cutting strip material into proper lengths to produce suitable blanks which by appropriate treatment may readily be formed into desired articles.

My invention is directed to cutting mechanism of the character stated having means assuring quick and clean cutting of the strip material, by a sharp blow or stroke at the instant of the cutting operation. More specifically, I provide cooperating plate and die rolls and associated elements, such that the rolls have abrupt relative, movement one toward the other, when the cooperating cutting elements are brought into cooperating relation to one another. Further objects and advantages of my invention will appear from the detail description.

The cutting mechanism above referred to, though suitable for many purposes, is particularly suitable for use in a machine for producing articles from strip-cardboard, such as the machine disclosed in my copending application for Trouser guard machine, filed September 23. 1940, Serial No. 357,847, now Patent No. 2,268,767, of which the instant application is a division. Accordingly, I have illustrated the cutting mechanism of my invention, by way of example, as applied to the machine of my above identified patent, showing those parts of the machine which contribute to a clear understanding of the construction and operation of the mechanism of the instant invention.

In the drawing:

Figure 1 is a semidiagrammatic lengthwise central vertical sectional view of a portion of the machine of my above identified patent embodying therein the mechanism of my present invention;

Figure 2 is a side view, partly broken away, of the gears at one end of the cutting rolls;

Figure 3 is a side View, partly broken away. of the rails at one end of the cutting rolls; and

Figure 4 is an isometric view of one of the die blocks and the cutting dies and associated parts carried thereby.

The machine comprises a suitably constructed main frame 35 supported by appropriately located base frames, one of which is shown at 31, which base frames may be enclosed in a suitable manner to provide housings available for storage or other purposes. Strip cardboard, or other suitable material, is trimmed and/or slit to provide three strips 45 of appropriate width each of which is delivered to suitable guide means 2!!! having aslsociated upper andlower rubber covered pulling rollers 222 and 223, respectively, supported from a frame 229, suitable means being provided for yieldably urging roller 223 upward for gripping strip 45, and roller 222 is suitably driven at proper speed to pull strip 45 through guide means 2H3 under desirable tension, the yielding mounting of roller 223 permitting slippage suflicient to prevent tearing or breaking of the strip gripped between the rollers 222 and 223; as disclosed in my above identified patent.

The strip 45 passes from the guide means 2H3 between a pair of cutting rolls comprising an upper plate roll 235 and a lower die roll 236. Plate roll 235 is secured on a shaft 231 rotatably mounted in bearing blocks 238 constutiting the side members of a rectangular frame 239 depending from two I-beams, one of which is shown at 240. Bearing blocks 238 are bolted or otherwise suitably secured to I-beams 249, and the latter seat upon cross I-beams 200 and 24! of the main frame 35. A bearing block 242 is secured to and depends from each of the bearing blocks 238, and a spacer 243 is secured to the underface of each bearing block 242, frame 229, formed in two sections, being suitably secured to bearing blocks 242 and spacers 243. The parts referred to may be secured together as by bolting or any other suitable manner and the frame 229 provides a support for the cross rods 2!!! and related parts, for the guide means 210.

Die roll 236 is secured on a shaft 245 rotatably mounted adjacent each end in a bearing block 246 slidable on guide rods 24! secured to and depending from bearing block 233. Rods 241 have their lower portions 241a reduced in diameter and are threaded at their lower ends for reception of nuts 248 which bear against the underface of a cross bar 249 slidable on the rods. A coil compression spring 250 is mounted about a plunger rod 25! disposed between rods 241 and slidable through crossbar 249 and an upper guide plate 252 suitably secured on rods 241. The upper end of plunger rod 25! bears against the underface of bearing block 245 and spring 252 is confined between cross bar 249 and a collar 253 on plunger rod 25!. Die roll 236 is thus provided with a floating mounting at each end and is yieldingly urged upward toward the plate roll 235 in an obvious manner. By means of the nuts 248 the compression of spring 255 may be varied to suit requirements.

Die roll 236 has mounted therein, in a suitable known manner, two diametrically opposite die blocks 255, the outer faces of which are flat. Each block 255 carries three cutting dies 255 A gear 258 (Figure 2) is secured on shaft 237- adjacent each end of plate roll 235 and a bearing disc or rail 259 is secured to each end of plate roll 235. The gears 258 mesh with gears 26ft secured on shaft 245 of die roll 235 adjacent each end thereof, one of such gears 26f! being shown somewhat in Figure 2. A bearing disc or rail 26! is secured to each end of die roll 236 and is maintained in bearing contact with the circumferential surface of the corresponding rail 259 on shaft 23'! by the compression spring 25!! in an obvious manner. The rails 259 are of circular shape throughout their extent, the pitch circle of the respective gears 258 corresponding to the contour of the associated rails 259. Each of the rails 26! is provided with two flat areas 26M corresponding to the flat outer faces of the die blocks 255. The pitch contour of the teeth of each of the gears 25!! corresponds to the contour of the adjacent rail 26!, this gear accordingly having two fiat areas corresponding to areas 265a of rail 26f. Plate roll 235 has mounted thereon, in any suitable known manner, two diametrically opposite cutting plates 262 conforming in curvature to roll 235, the outer faces of these plates being flush with the outer circumferential faces of the railst259, as shown more clearly in Figures 1 and 3.

Gears 253 mesh with pinions (not shown) secured on a countershaft Z66 rotatably mounted parallel with shaft 23?. Countershaft 285 is driven from a rotatably mounted shaft 26? in a suitable known manner, convenientlyby chain and sprocket means. rails 259 and plate roll 235, are driven in clockwise direction, as viewed in Figure 2, and serve to drive gears 268, and with them rails 26!! and die roll 2%, in counterclockwise direction. The

guide means 255] directs the strip 35 between t the rolls 235 and 2 36 and positions it accurately for cutting by the dies 256. In the rotation of the cutting rolls, the strip is cut into suitable Gears 258, and with them lengths to provide blanks having each end more or less rounded and provided with a substantially hook-shaped slit with a short central slit hookshaped extending from the inner hook portion of one of the slits, produced by a corresponding extension of the following portion of cutting die 25s, as will be clear from Figure 4.

The blanks pass from the cutting rolls to blank guide means 215, thence between upper and lower rubber covered gripping rollers 282 and 283, respectively, similar to rollers 222 and 223,

supported from frame 229. Roller 282 is driven at such speed that the blank severed from strip 85 is advanced at increased speed, so that the cut blanks are thus spaced a short distance apart.

The rollers 282 and 283 deliver the blanks in spaced apart relation to suitable guide means 3M, from which the blanks pass between the upper and lower runs of upper and lower endless belts 346 and 3 respectively, of a transfer unit 332 provided, at each side, with a bolting flange 3&3 seating upon and bolted to an angle cross member 344 of the main frame 35. I'he transfer unit conveys the blanks to forming means by which they are formed to desired shape. The guide means 215, rollers 282 and guide means 39!], transfer unit 343, and associated parts, and the forming means, are all described in detail in my above identified patent and need not be further described here.

As previously mentioned, the following portion of die 255 (Figure l) has associated therewith an elastic cushion 25?. As the dies and the plates of the cutting rolls come into register, plate 252 rolls across the dies, which are urged toward the plate by spring pressure in the manner previously described, roll 236 moving upward abruptly so as to, in effect, strike the strip 45 a sharp blow with the die. This assures clean and accurate cutting of the strip. Since the forward portion of the strip is, at that time, gripped between the pulling rolls 282 and 283, the following end of the blank thus produced will be pulled free of the cutting rolls. In order to assure the succeeding blank will enter the guide means 2% properly, it is desirable that means he provided to force out of the dies the end portion of the strip which is to be the leading end of the next succeeding blank. When this cut made by the following portion of die 258, the cushion 25? is compressed and, as soon as the die 256 and the plate 262 pass out of cooperating relation, cushion 251 expands forcing the cut end portion of the strip out of the die, thus assuring that this end of the strip willvclear the cutting rolls and pass into the guide means 215.

It will be understood that changes in construction and arrangement of parts of my invention may be resorted to without; departing from the field and scope thereof, and I intend to include all such variations, as fall within the scope of the appended claims, in this application in which the preferred form only of my invention has been disclosed.

I claim:

1. In a machine of the character described, cutting means comprising a plate roll and a cooperating die roll geared together, die blocks carried by said die roll, cutting dies in said blocks projecting beyond the outer faces thereof, bearing rails secured to said die roll provided with flats corresponding to said blocks and otherwise of circular contour, bearing rails of circular contour secured to said ,plate roll and bearing upon said die roll rails, and means yieldingly urging said die roll toward said plate roll.

2. In a machine of the character described, cutting means comprising a plate roll and a cooperating die roll, die blocks carried by said die roll, cutting dies carried by said blocks projecting beyond the outer faces thereof, bearing rails secured to said die roll having flats corresponding to said blocks and otherwise of circular contour, gears secured to said die roll having the pitch contour of their teeth corresponding to the contour of said die roll rails, circular rails secured to said plate roll bearing on said die roll rails, gears secured to said plate roll meshing with said die roll gears and having the pitch contour of their teeth corresponding to the contour of said plate roll rails, and means yieldingly urging said die roll toward said plate roll.

3. In a machine of the character described, cutting means comprising a plate roll and a coroll, cutting dies carried by said blocks project ing beyond the outer faces thereof, bearing rails secured to said die r011 having flats corresponding to said blocks and otherwise of circular contour, gears secured to said die r011 having the pitch contour of their teeth corresponding to the contour of said die r011 rails, circular rails secured to said plate r011 bearing on said die r011 rails, gears secured to said plate r011 meshing with said die r011 gears and having the pitch contour of their teeth corresponding to the contour of said plate r011 rails, and means yieldingly urging said die r011 toward said plate roll, the depth of the teeth of said gears and said rails being so related as to prevent bottoming of said gear teeth.

LAWRENCE A. MOORE.

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