US1928845A

US1928845A - Cutting attachment for sewing machines

Info

Publication number: US1928845A
Application number: US553211A
Authority: US
Inventors: Joseph P Zaidan
Original assignee: Individual
Current assignee: Individual
Priority date: 1931-07-25
Filing date: 1931-07-25
Publication date: 1933-10-03
Anticipated expiration: 1950-10-03

Description

Oct. 3, 1933. J. P; ZAIDAN 1,928,845

CUTTING ATTACHMENT FOR SEWING MACHINES Filed July 25. 19 31 ATTORNEYS Patented Oct. 3, 1933 CUTTING ATTACHMENT non SEWING I MACHINES it P Joseph P; Zaidan, Scranton, Pa. Application July 25, 1931. Serial bio-553,211 s lclaims. (01. 164 17.5)

My invention relates to cutting machines and more particularly to a cutting attachment for sewing machines. I I

An object of my invention is to provide an improved scissors mechanism forcutting cloth, pa-

per and the like in which the cutting mechanism is wholly enclosed. V I

Another object of my invention, is to provide a positive feeding arrangement of the material to be cut during the operation of the cutting mechanism. V J

Yet another object of my invention is to provide a cutting device having a feeding mechanism adapted to exert a pull on the material to be cut so that the material is under tension during the cutting operation.

Still another object of my invention is to provide driving mechanism for the cutting and feeding device, wherein the feeding and cutting operations are synchronized.

With these and other objects in view, which maybe incident to my improvements, the invention consists in the parts and combinations to be hereinafter set forth and claimed, wit-h the understanding that the several necessary elements, comprising my invention, may be varied in construction, proportions 'and' arrangement, without departing from the spirit and scope of the appended claims. V

In the drawing like numerals refer to similar parts throughout the several views, of which Figure 1 is a side elevational view of an improved mechanism, the enclosed operating parts being shown in phantom view;

Fig. 2 is a top plan view of the structure shown in Fig. 1; and

' Fig. 3 is a front elevational view of the structure shown in Fig. 1.

The structure embodying the principles of the present invention comprises generally a casing 10 having side walls 11 and 12, spaced to form a chamber 13 adapted to receive a cutting mecha: nism. The spaced side walls 11. and 12 are joined by

end walls

14, 15, which may beformed integral with member 11 and dished or bent at right angles and conformed to member 12. The front edge 15 of the casing may be bent or turned ."earwardly as indicated at 16 in order to provide access to an adjusting screw 17, to be described more in detail hereinafter.

The base of the casing may be formed or struck up from the member 11 in the same manner as the

end portions

14, 15 and 16, and the casing may be secured to any suitable support by means of screws or clamps engaging cleats or lugs 18 secured to the side walls of the casing.

Additional securing means may be had by providing apertures in member 18 and screwing the casing down on to a support such as'a table 19. The two halves of the casing may be held together by any suitable manner as by means of screws 20.

A slot 21 is formed in the front of the casing and the sidewalls extend rearwardly and outwardly as shown. At the upper edge of this slot and attached to the side wall 12 by suitable means such as screws 22, there is provided a fixed blade 23. As noted, this blade is co-extensive with the upper edge of the slot 21 and is adapted to engage with material fed into the slot. An oscillating blade 24, provided with a rearward extension 25, is fulcrumed on the side wall 12 by'mea'ns of a pivot 26 and is'adapted to coact with the fixed blade 23.

,A crankshaft 27 is journaled in the'sid'e walls 11 and 12 of the casing and is provided with a driving wheel 28 normally positioned exteriorly of the casing on the outer end of the shaft. The shaft and driving wheel are heldintheir proper position by means of nuts 29 and a spacing washer 30. A sprocket wheel 31'is provided on the crank shaft and inside the casing for a purpose to be described morein detail hereinafter. The extension 25 of the oscillating blade 24, is operatively connected to the crank shaftby any suitablemeans such as link 32. g

Itwill be seen that'upon rotation of the member 28, a reciprocating motion is imparted'to the link, which, acting through the arm 25 of the blade 24, will cause the latter to oscillate across the, cloth receiving aperture 21 and in operative engagement with the fixedblade 23 of the improved scis'sors or cutting mechanism.

To facilitate the feeding of the material to be cut through the slot 21 and into contact with the cutting edges of the scissors blades, feeding mechanism is provided. This mechanism comprises pairs of opposed rolls '33, 34, 'mounted for rotation on

shafts

35, 36, which are respectively journaled in the sides 11 and 12 of the casing. The shaft 35 is provided with a fixed bearing and is also provided with a sprocket wheel 37 whichis operatively' connected to the crank shaft 27 by means'of a chain 38; It will thus be seen that theguide whee1s33 and the feeding rolls are r positively'and synchronously driven with an'oscillating blade by the common power supplying member 28.

' slots 41 formed in the side walls. These slots are 1 the coacting wheels 33. The end of the threaded shaft 42 may be turned over as indicated at 43- to prevent the withdrawal of the adjusting nut 17, which may be provided with wings 44-tofacilitate adjustment. The coiled spring- 45 is disposed around the shaft 42 and bears against the wall 16 and the bushing 39, thus keeping the latter underconstant tension urging the rolls 34 against the rolls 33.

" To facilitate the cutting of the material along a straight line, a guide mark 46 may be provided on plate 15 to indicate the line of the cut. To

further improve the efficiency of the cutting as well as to insure the straight feeding of the material the

rolls

33 and 34 may be provided on their peripheries with treads 47 which are so configured as to progressively stretch the cloth fed into slot 21 away from the line of the cut thus facilitating the operation of the cutting mechanism, in that the cutting is effected on a tensed material.

To preveritthe material which has passed beyond the feed rolls from becoming entangled with the driving member 28, a guide '48 is secured to the member 12 and is so positioned as to extend from the internal end of the slot 21 parallel to and over the member 28. While the driving member 28 may be driven by a belt connecting to a motor or other suitable source of power it will of course be appreciated that a motor may be directly connected to the shaft 27 or suitable reducing gear interposed between'the motor and the shaft and the whole contained in a separate housing or included within the space 13 of the casing, the'latter being appropriately designed to take care of the space required. I

It will be seen that during the operation of this device the oscillating blade 24 is cutting the material on its upward stroke and due to the length of the arm 25 the movement of the blade portion is very rapid and as the return of the blade takes place immediately following the finish of the cutting stroke there is no interference of the oscillating blade with the constant feed of the material caused by the positively driven feed rolls 33 and the coacting rolls 34.- This uniformity of feed permits desirable economies in operation and due to the simplicity of the operating parts the device may be readily dismantled in order to permit sharpening of the blades or replacement thereof.

It will now be appreciated that there has been provided an improved cutting mechanism; adapted for the automatic feeding and cutting of cloth, paper and like materials of varying thicknesses which mechanism is susceptible of manufacture in a variety of sizes and is adapted for domestic The adjusting screw 1'7 acting 'paper and the like, comprising a frame having spaced walls slotted transversely of one end to form cloth receiving means, cloth feeding and spreading rolls disposed in pairs on either side of the slot, a fixedcutting blade secured to one edge of the slot, an oscillating cutting blade journaled in one wall of said frame and adapted to coact with said fixed blade, drivingmeans for said oscillating blade comprising 'a crank shaft journaled in the walls and a link mechanism connecting the shaft and blade and means operatively connecting the crank shaft and feed rolls for driving the'latter upon oscillation of the blade. I

2. A cutting machine for cutting cloth, paper, and like materials, comprising, in combination, a fixed cutting blade, an oscillating cutting blade adapted to cooperate therewith, actuating means for said oscillating blade including rotary driven means and a link mechanism between said oscillating blade and said rotary means, a frame for said cutting members comprising parallel side members, one of said members being dished, and the other of said members forming a cover for said dished member, a material receiving slot formed in the side members adjacent the fixed cutting blade, a plurality of opposed cooperating material-engaging" rollers disposed on either side of said slot and adapted to feed material therethrough and driving means for said rollers connected to the rotary driven means.

3. In a cutting machine for cutting cloth, pa- 1 per, and the like, a standard comprising spaced walls, means formed at the base of the walls for holding the machine in fixed position, cutting mechanism disposed within the walls comprising a fixed cutting blade secured to one of the walls, a slot in said walls giving access to said blade, an oscillating blade pivotally mounted on one of said walls in operative engagement with said fixed blade and slot, a link mechanism adapted toimpart motion to said oscillatory blade, rotary driving means journaled between said walls and connected to said link mechanism, feeding means for cloth and the like, comprising opposed rolls having gripping surfaces adapted to spread the cloth and present it to the cutting blades, said feeding and spreading rolls being journaled between the said walls on either side of said slot, tension adjusting means for at least onepair of said feeding rolls and means connecting said rotary driving means and at least'one pair of feeding rolls, and means for driving said rotary means.

JOSEPH P. ZAIDAN.