US2093071A

US2093071A - Pinking machine

Info

Publication number: US2093071A
Application number: US40751A
Authority: US
Inventors: Brussell Jacob
Original assignee: Individual
Current assignee: Individual
Priority date: 1935-09-16
Filing date: 1935-09-16
Publication date: 1937-09-14
Anticipated expiration: 1954-09-14

Description

Sept. 14, H337. Uss 2,093,071

PINKING MACHINE Filed Sept. 16, 1935 2 Sheets-Sheet 1 INVENTOR (/14 C08 e/wssa L ATTORNE Sept. 14, 1937. I J. BRussELL. 2,093,071

PINKING MACHINE :Filed Sept. 16, 1935 2 Sheets-Sheet 2 INVENTOR dA 608 BRUJSEZ;

Patented Sept. 14, 1937 PATENT OFFICE PIN KIN G MACHINE Jacob Brussell, New York, N. Y., assignor to Isadore Friedman, Roselle, N. J.

Application September 16, 1935, Serial No. 40,751 5 Claims. (Cl. 112-122) My invention relates to pinking machines, and in more detail, to pinking machine attachments for sewing machines, which attachements are operated either through gears from the arm of the sewing machine, or directly from the needle bar.

My present invention is an improvement on the invention described in my application; Serial Number 27,910, series of 1935, filed June 22, 1935 and the machine described in my patent, Number 2,010,216, issued August 6, 1935, in that the machine cuts by shearing and not by punching, thus preventing wear on the cutting edges and faces and decreasing the shock of the action of the machine.

An object of my invention is to produce a shearing pinking machine which will act on the principle of a scissors.

Another object is to produce a pinking attachment for a sewing machine which can be used as a straight edge cutting attachment by reversing the two cutting blades.

Another object is to produce a simple, lightpinking attachment which can be mounted on the plate of the sewing machine and receive its power directly from the needle bar, thus obviating the cutting away of any portion of the arm casing and the use of gears on the sewing machine parts.

Another object is to produce a pinking attachment for a sewing machine with a multiple number of teeth covering an appreciable cutting width so that one descent of the cutting blade is equivalent to several revolutions of the stitch making parts.

I accomplish these and other objects by constructing on a suitably cut reversible shearing plate a suitably cut reversible knife blade pivoted at one end to the shearing plate and providing means at the other end for attaching either to the arm or the needle bar of the sewing machine.

Further and more specific objects, features and advantages will more clearly appear from the detailed description given below taken in connection with the accompanying sheets of drawings which form a part of this specification.

Figure 1 is a side view of my pinker attached to a sewing machine with part of the sewing machine and the base of the pinker partially cut away. Figure 2 is a perspective assembly of one form of the cutting parts of my pinker. Figure 3 is a plan view of one form of my pinker, removed from the sewing machine. Figure 4 is a front View of one form of pinker with the knife opening 24 to receive the endofthe bolt blades reversed and, in aposition for straight cutting. Figure 5 is a side elevation of one form of pinker. Figure 6 is a front view of a pinker attached to the needle bar of a sewing machine with the blade raised and in a position for pinkll'lg.

My pinking machine I is mounted on the sewing machine base 2 to the right of the needle bar 3 of the sewing machine (rest of sewing machine not shown). In general, my pinker shown in Fig. 1 is similar to the ones described in my above mentioned application and patent and has a base 4 on which the bearing 5 and spring post 411 are mounted. Pivoted in the bearing 5 isthe arm 6 ending in the forked pin joint- 1. Intermediate the bearing Sand joint 7 is the driving 'arm connection 8 throughwhich power is derived to manipulate the pinker. Between the arm 8 and the bearing 5 on the arm 6 is the spring mechanism 9 which provides the necessary compression in the pinker. The base 2 of the sewing machine is cut away and the base 4 of the pinker is provided with the. opening 9a in I order to receive the cutting element I 0. The front of the pinker is provided with the shear plate ll against which the cutting element operates.

The cutting element [0, shown in perspective assembly in Fig. 2, is assembled in Fig. 1 and comprises the forked holder l2, the knife part I3 and the screw and washers M which hold the knife part, firmly in position against the forked holder I2. The forked holder l2 at its upper part is narrow and provided with the opening l5 to permit thebolt [6 to pass therethrough and form a pin connection in the joint 1. The lower part of the holder 12 is forked and provided with the opening I], while the rear of the holder is provided with, the extended bent arm I8 and roller I 9.

The knife element I3 is provided with the teeth 20 at the front and with the rear plate 2| for fitting into the opening I! in the holder. The plate 2 is also threaded to receive the bolt H. To the rear ,of the teeth 20 a cutting edge 22 is provided. This edge extends above the plate 2|. The edge 22 is straight and provides for straightv cutting while the teeth 20 provide for pinking, and to use the cutting element for straight cutting, the knifeelement is reversed, the front'be- 0 coming the back. To do this, the space 23 is clearedof teeth and provided with a threaded M. The lower end of the knife element is constructed similar to the upper end in order that these ends rectly to which'is attached the shear plate 42.

element theupward extending spring can be reversed and so provide for two pinking cutting faces and two straight cutting edges. To one side of the teeth is provided the upper and lower extended piece which acts as a guide as hereinafter described.

The cutting element l I against which the knife i3 shears is constructed in two parts, the arms 26 which are fixed to the base of the pinker and the shearing edge piece 21. The edge piece 21 is screwed to the arms 25 by the screws 28 and is reversible. The piece 2] is provided with the cutting edge 29 at the front for straight cutting and with the indentures at the rear for pinking with the knife element I3. To the sides of the indentures 35 the straight edge 3! extends so that the extension 25 of the knifeelement can rest against it as the knife reciprocates in and out of the shear plate and prevents the spring from forcing the knife forward out of its proper position when the cutting parts are above the shear plate. When the element 93 is in' a posi tion for pinking with the teeth 24 to the front, the shear plate is mounted so that the indentures 30 are to the rear to co-act with the teeth, and when the cutting edge 22 of the element 43 is to the front, the edge 25 of the shear plate is to the rear to co-act therewith. In order that both the edges 22 for cutting and the teeth 28 for pinking can shear the goods to be out instead of punching, the edge 22 and the face of the teeth slope upwards to the left on both the under and upper parts of the knife element, thus causing the cut ting edges and pinking parts of the knife element and shear plate to come into contact consecutively as would the parts of blades of a pair of shears.

The necessary compression to force the cutting parts into close contact is provided by the spring mechanism v9 againstone branch 32 of the pivoted arm 33 so that the other branch 34 of the arm presses against the roller I9 of the arm l8. The arm 33 is pivoted at about its mid point into the spring post 4a..

The description previously given relates mainly to Figs. 1 and 2 and the pinker described deals principally with the same pinker mentioned in the previous application but differs therefrom in the knife,,its holder. and the shearing plate, and provides forstraight cutting as well as pinking and for shearing instead of punching.

The modification shown in Figs. 3, 4 and 5 provides for a pinker in which the arm pivoted to the shear plate itself carries the knife.

In' Fig. 4, the pinker shown, or. the part shown, can be attached either by having the arm connection 46 joined to the sewing machine direct-,

ly or to the forked pin joint 1 of Fig.1. In the drawings shown in Fig. 6, the pinker is joined dithe needle bar of the sewing machine, thus eliminating cutting away parts of the sewing machine casing, supplying extra gears and many extra pinker parts.

The pinker shown in these modifications is constructed with a base plate 4| to the front of The base plate 4| can be either fixed directly to the sewing machine or as shown in Fig. 5, attached to the base 4 of the pinker shownin Fig. 1. The base plate is providedwith an upward projecting part 43 on the left and with the upward extending spring 44 on the right. The part 43 has pivoted in its upper part the arm 45 by the nutand bolt 45. The arm 45 extends across the shear plate and carries midway between its ends the knife element 41 andto the right of the, knife 44 presses been described, but

' desire to cover.

against the arm so as to force the knife element 4? into close contact with the shearing plate. At the end of the arm 45 removed from the pivot 45 is the pin joint 48 which connects the pinker by the arm 49 and joint 50 to the extension 5| which passes through the lower end of the arm connection 5. If the pinker is to be joined to the sewing machine directly, as shown in Fig. 6, the arm 45 is provided with the slot and the curved arm 52 is provided, the lower end of which carries a pin 54 passing through the slot 55 of the arm 45 and the upper end carries the collar 53 which clamps onto the needle bar, so as to cause the arm 46 to reciprocate together with the needle bar. Thus, the one end of the arm 46 being pivoted at 45 and the other end reciprocating, the knife 4! travels in the path of an are about the pivotal center 45. The knife 41 is constructed with the teeth 55 curved in the form of an arc the center being the pivotal point 45 so that all points in'each tooth are equi-distant from the center. The indentures 5'? in the shear plate are similarly oppositely constructed and use the same center so that there is always a perfect contact between the teeth and the indentures into which they fit. On the knife 4'5, to the rear of the teeth, is the cutting edge 59 against which the edge 58 can cut when the knife and shear plate are reversed.

By constructing the two co-operating cutting parts 'on pieces pivoted together and having the pivot 45 above the line of contact of the cutting parts, the action of cutting becomes one of shearing and the operation is similar to that of a pair of scissors. v V

In the knife blades and shearing plates, two or three teeth and indentures are shown and provide for cutting over a wide'space withone stroke of the cutting element. as the goods travels slowly under the needle in comparison to the amount cut in one stroke, the cutting machine may be geared or fixed to the driving mechanism of the machine in such a manner that the cutting mechanism reciprocates' at a higher ratio than normally in pinking machines, as for instance, one to four, and so makes fewer revolutions and travels slower.

It is to be noticed'that the pinking mechanism shown in Fig. 1 is fixed on the sewing machine in a line perpendicular to the line of sewing and r the reciprocating parts travel on this line, and the center about which the reciprocatingparts move is also on this same line through the needle.

vTo compensate for this,

However, in Fig. 6 and the modification shown in Figs. 3, 4, and 5 the machines are placed on a line parallel to the line of sewing and to the right of this line. The'knife is placed on'the rotating arm in the direction of rotation which is the line of the machine. In this way, the'edge of the knife travels in an are which is in the plane of the rotating parts of the pinker, while in the pinker shown in Fig. 1, the knife edge is perpendicular to the line of rotation of the moving parts. This alignment of the knife edge with v the direction of the moving parts helps produce the shearing in the machine and tends to eliminate the sudden shock of the cutting edge against the cloth.

Although several modifications of .my invention are shown in the drawings and described, many changes and forms are possible which have not which still come within the of thisQinvention and which I Therefore, all forms and embodiments coming within the language and scope spirit and scope of any one or more of the claim as my invention.

I claim:

1. A pinking device for a sewing machine having a shear plate, a carrier arm pivoted to the shear plate, an arm slidably connected to the carrier arm at one end and firmly connected to the needle bar of the sewing machine at the other end, a knife element positioned on the carrier arm for co-acting with the shear plate to cut, and a spring mounted on the shear plate and co-acting with the carrier arm to force the knife element against the shear plate.

2. A pinking device for a sewing machine having a shear plate having indentures therein, a knife element having teeth thereon, pivoted to the shear plate, the indentures in the shear plate and the teeth on the knife element being curved and having the pivot of the knife element the center of the curve, and said teeth entering the indentures when the knife element is rotated about its pivot, and a driving means connecting said knife element to the sewing machine.

32-. A pinking device for a sewing machine having a shear plate having indentures therein, a knife element having teeth thereon, pivoted to the shear plate, the indentures in the shear plate and the teeth on the knife element being curved and having the pivot of the knife element the center of the curve, and said teeth entering the indentures when the knife element is rotated about its pivot, and the pivot of the knife element being above the line of contact of the knife eleappended claims, I

ment and shear plate, a spring means forcing the knife element against the shear plate, and a driving means connecting said knife element to the sewing machine.

4. A pinking device for a sewing machine capable of pinking or straight edge cutting having a base plate, a shear plate reversibly attached on the base plate having indentures on one edge for pinking and a straight sharpened edge for cutting on the opposite edge to the indentured edge, a carrier arm pivoted on the base plate, a knife element reversibly attached on the arm comprising a plate having teeth on one face and a straight sharpened edge on the opposite face, and said shear plate directioned in relation to the knife element that the straight edge of the shear plate coacts with the straight edge of the knife element or that the teeth of the knife element coact with the indentures of the shear plate, and spring means forcing the knife element against the shear plate and means connecting-the carrier arm to the sewing machine to derive motive power therefrom.

5. A reversible front to rear and top to bottom knife for a shearing pinking machine having a top face, a front face, said front face having teeth extending to the top for pinking and said top face having a straight cutting edge to the rear for straight cutting when the knife is reversed and an under face similar to the top face and mounting means permitting reversing the knife, top tobottom and front to rear.

JACOB BRUSSELL.