US1745442A - Clamping device for web-cutting machines - Google Patents

Description

Feb. 4, 1930. H. w. ORNDOFF CLAMPING DEVICE FOR WEB CUTTING MACHINES 3 Sheefs-Shet Filed Aug. 24, 1928 ML 766 a.

Feb. 4, 1930. H. w. ORNDOFF ,CLAMPING DEVICE FOR was cu'r'rme MACHINES Feb. 4, 1930. H. w. ORNDOFF 1,745,442

CLAMPING DEVICE FOR WEB CUTTING MACHINES Filed Aug. 24, 1928 3 SheetsrSheet 3 Invenfar: jfferaerf Z0- Orndofi mah neshow ngth a rang e t fithesup.

Patented Feb. 4, 1930 UNITED STATES, PATENT OFFICE HERBERT w, ORNJJOFF, OF NEW ORLEANS, LOUISIANA, Assre vonro THEE. v. BEN- JAMIN 00., me; or NEW ORLEANS, LOUISIANA, A oonronA'rron or LOUISIANA,

TRADING AS MAGINNIS corzron MILLS C A I CE FOR EB-C TING MACH ES Application filed August 24, 1928. Serial No. 301,909.

This invention relates to" a clamping-device for employment in a web-cutting 'IIlflClllIlB,

, :and is particularly adapted for employment in such machines which utilize a continuous supply o-fweb'to the cutting mechanlsm.

It has been found in practice that for accuracy of out and for low power-demand upon the driving system, it is desirable that the cutting blades should-operate successively across the'width of'the fabric, in order to avoid the jerk in thedriving system which might occur I ,if the knife were designed to operate instantimed relationship with respect to the opera- 1 ti'on of theknifeitselfa Guide meansare protaneouslyu for the entire width, and also to gain the advantage of a progressive or scis- 'sors-like cut. When this is attempted with a continuoussupplyof web material to thecut- 'ting device, -the cutting isapt tobe distorted away from the true right angle across the'web.

' According to the present invention, means are provided for clamping the webon itsway to' the .cuttingdevice, and'for its entire width, so that the web is supported during the t me 'for-which-the knife operates to sever a portion from this web.- The clamping device comprises gripping members extending for thewidth of themac'hine and normally outof engagement'with the web, but adapted to be brought; to clam-ping relationslnp therewith by means of a cam driven with the kmfemechanism so that the clamping occurs at proper videdfor delivering the web tojthe clamping members and for guiding it therefrom tothe knife edges proper. 1

These and other features of: the invention are illustrated in t eaccompanymg drawings, which Show: I VFigure 1 is an end view of a port on of a ply ng, utt ng and clampi g devi A t ken parall l o ig 1, owingther la t on h ip f hes ver lp t them m ltfifclamping .an vcut ing- F 1g, 2 -is a seotiona-lview on a largerscale,

Fig. 3 is a similar view leasing p s on for he the Web prior to a new cutting.

vFig. 4 is a top plan view of one side of the machine.

In these drawings, the machine has a fixed table plate with an upwardly extending standard 15 thereon providing a bearing for the shaft of the measuring drum 21. The standard 15 also hasa bearing for the cutting shaft 22. Brackets 23 carry a fixed knife 24.

Arms 25 rigidly supportedon thestandard 15 are provided withpivots 26 to pivotally support a swinging plate 27 which extends for the full width of the web, and has an angularly bent bottom edge 28. This plate isstiffened at its lower end by an angle iron 29 riveted thereto. At the lower edge of the plate and angle iron are roller brackets 30 to support the pivot pins 31 for the rollers 32. One roller is provided ateach side of the machine, beyond thedrum and knife, for cam actuation as will be described more closely hereinafter.

The standard l5 likewise carries an angle bracket 33 having'a support 34 thereon for a rubber cushion pad 35 which likewise extends for the widthof the web and is located opposite the angle at the lower end of the swinging plate 27 for cooperation therewith to clamp the web, and substantially vertically above the edge of the stationary knife 24. The support 34; also carries a guide plate 36 which removes the web from the measuring drum 21 and guides it down between the swinging plate 27 and the rubber pad 35. After the web has passed between the gripping members 28, 35 when the latter are open,

it encounters a second guide plate 37 formed of thin resilient material which delivers it to the edge of the stationary cutting knife 24, from' which it passes onto the continuously moving tape 38 passing over the guide roller 39, being carried by the continuous movement of this tape towardthe left, insuccession as it is fed by the measuring drum 21.

' The continuouslyrotatingcutting shaft 22 carries a clamp member 40 to which the re volving knife 41 is fastened in a customary manner by cap screws 42, so that the knife will cooperate with the stationary knife 24 to shear the material with a scissors-like action by reason of the slightly helical shape of the revolving knife.

Y in? The cutting shaft 22 furthercarries at each end a cam member 43 having a hump 44 to cooperate with a swinging roller 32 at the moment of cutting. The arms 25 are provided with spring holders 45 to support one end each of return springs 46 which at their other ends are connected to the swinging .shaft and the sprocket 51 on the measuring drum shaft are connected by a chain .52 so that the two members move at a definite speed relationship and with definite angular movements with respect to one another. They are continuously drlven from any suitable source of power by a chain drive 53 (Fig. 4) which drives a sprocket 54 on the cutting shaft 22. I As the measuring drum moves, it receives a web of fabric and'passes itdownward between the gripping devices comprising the angle on the swinging plate 27 and the rubber pad 35, past the stationary knife 24 and onto thedelivery tape 38. F or the time be ing, the swinging plate 27 is held away from any gripping action by its return spring 46, and the guides 36 and 37 cooperate to deliver the sheet in regular manner to the delivery tapes 38. It is preferred that the resilient guide plate 37 should be held very close to the edge of the stationary knife 24, and it may be formed of soft brass and permitted to: pass beyond the edge of knife 24 a short distance to assure that the material shall not remain hanging or supported onthe stationaryknife 24. I The rotating knife 41 represses the resil ient plate .37 without damage to itself or. the plate. r During this delivery, the cutting shaft 22 has been rotatedwith the measuring drum shaft 20, until finally the rotatingknife 41' comes into shearing relationship with. the stationary knife '24 and shears off the web of material for its entire width. A very short;

time prior to the beginning. of this shearing operation, the rise or hump 44 of the'cam 43 has encountered the swinging roller 42 and has forced this roller and therewith the of the web of material past the stationary.-

knife 24. The shearing is accomplishechand immediately following this, the hump 24 passes from opposite the swinging roller 32 and permits the latter and the swinging plate 34 to be returned in a clockwise direction by the spring 46, so that the web of material. is again free to move downward past the stationary knife 24 and onto the delivering table 38. Meanwhile, the delivering tapes have carried along the blank or sheet which has just been cutoff.

.The clamping operation .of the gripping members, as just described, causes a momen- V tary stoppage of the end of theweb of material, so that the measuring drum will'cause a small accumulation of material in the an-, gle between the swingingjplate 27 the guide plate 36 and the drum itself; but such accumulation is easily taken care of in the Space, I It may be pointed out that in a machine already constructed the angular displacement aboutthe cutting shaft of the two ends of the I helicalcutting edge is about five-eighths of an inch for a knife length of fifty inches. In other words, the length of they hump 44 0f cam 43 is designed to be slightly greater than five-eighths of an inch in peripheral angular distance. I

Itis obvious that the invention is not limited to the illustrative example shown and described, but that it may be applied in many 2 ways'within the scope of the appended claims.

What I claim as newand desire to secure by Letters Patent is 1 1. Ina device of the class disclosed, a drum, acutter to sever. a web'of material coming from said drum, means-to continuously drive said drum andcutter, an'd means synchronized with thecutter to clamp the web during thetime of cutting-while permitting the continuous feeding of the web bysaid drum.'

2; In a device'of the class described, a feed ing drum, a cutter to sever a web ofmaterial coming from said drum, means to continuously drive said drum and cutter, fixed guide means to deliver the material from said drum to said cutter, a swinging plate to cooperate with said fixed. guide means, means to hold said swinging plate and said fixed guide means, normally separated, and means syn-. chronized with the cutter to move the plate toward said fixed guid-e whereby to clamp I to feeda web of fabric, a guide delivering the web from said drum, a stationary knife mounted wlth its cutting edge substantially beneath the end of the delivery "guide, a rotating knife to cooperate withsaid stationary.

knife, driving means to: continuously .oper: ate said drum and rotating knife, and means synchronized with said rotating knife to clamp the web of fabric'during thetime of cutting, said clamping occurring substane'dge. r

a 4. In a deviceof the class described, a drum to feed a web of fabric, fixed guide meansto tially vertically above the stationary knife 7 deliver the web from the drum, a stationary from said fixed guide means, and a stop to knife opposite the end of said guide means, limit the movement of said plate away from a rotating knife to cooperate with said stasald fixed guide means.

tionary knife, means to drive said rotating 5 knife and drum continuously, a fixed clamping plate located in said guide, and means synchronized with said rotating knife to clamp the web during thetime'of cutting,

said guide means including a resilient guide member to deliver the fresh cut edge of the web after cutting from said clamp past sald stationary knife.

5. In a device of the class described, a

drum to feed a web of fabric, a frame to support said drum for rotation, a bracket fixed c on said frame, a fixed guide on said bracket to deliver the web from said drum, a rubber pad fixed on said bracket, a swinging plate pivoted on said frame, said plate having a rebent lower end presenting an angle for cooperation with said pad to clamp the web of fabric, cutting means to sever the web of fabric located substantially beneath said pad, means to drive said drum and cutting means continuously, and means synchronized with 7 said cutting means to operate said plate to clamp the web during the time of cutting.

6. In a device of the class described, a drum to feed a Web of fabric, a rotating shaft having a cutter thereon, means to drive said drum and cutter continuously, clamping means to clamp the web of fabric between said drum and cutter, a stationary cutter to cooperate with said rotating cutter, a cam on said shaft, 5 and means cooperating with said cam whereby said cam and means actuate said swinging plate to clamp the fabric during the time of 7 cutting.

7. In a device of the class described, a drum to feed a web of fabric, cutting means including rotating and stationary knives, fixed guide means ,to deliver the web from said drum to said knives, and a moving plate to cooperate with said guide to clamp the fabric between said drum and cutting means, means to drive said drum and rotating knife continuously, and means synchronized with the rotating knife to clamp the web during the time of cutting, said guide and plate forming a collector forv the material fed by the drum during such clamping.

8. In a device of the class described, a

drum to feed a web of fabric, a frame in which said drum is journaled, fixed guide means on said frame to deliver the fabric from the drum, a plate pivoted on said frame p and adapted to be swung toward said fixed guide means whereby to clamp the web of 6Q fabric, cutting means including rotating and fixed knives, means to drive said drum and rotating knife continuously, means connected to said rotating knife to actuate said plate to clamp the web during the time of cutting, means to normally hold said plate separated In testimony whereof, I affix my signature.

HERBERT w. oRNDoFF.

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