US1292784A - Cutting attachment for sewing-machines. - Google Patents

Description

R. R. HUGHES. In. CUTTING ATTACHMENT FOR SEWING MACHINES.

APPLICATION FILED OCT l2. l9l4-- Patented, Jim.- 28, 1919/ 2 SHEETS-SHEETI attom qx R. R. HUGHESI JR.

CUTTING- ATTACHMENT FOR SEWING MACHINES.

APPLICATION FILED OCT. 12. 1914.

1 ,292,784. Patented Jan. .28, 1919.

2 SHEETSSHEET 2.

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ROBERT E. HUGHES, JR., OF NEW YORK, N. Y., ASSIGNOR T0 "UNION SPECIAL MACHINE COMPQNY, OF CHICAGO, ILLINOIS, A COBPORATWN CF ILLINOIS.

CUTTING ATTACHMENT FOR SEWING-MACHINES.

Specification of Letters Patent. Patentgd Jan, 28, 1919,

Application filed October 12, 1914. Serial No. 866,314.

To all whom it may concern.-

Be it known that I, ROBERT R. HUGHES, Jr., a citizen of theUnited States, residing at New York city, in the county of New York, State of New York, have invented The object of theinvention is to provide a device which can be operated automatically by the reciprocation of the presser bar under the action of the feed dog or under the action of the foot lifting lever; or may be operated by some other moving part of the machine; or by the movement of the thread or stripitself inserted in the jaws of the attachment and drawn upon by the operative. 'Thus it will be seen that the device may operate either while the machine is in operation or at rest.

The invention has been especially designed for use in connection with the well lmown Union Special overseaming machine, and especially to a machine of that character having a trimmer and binder applied, such as illustrated in the applications filed in the name of James R. Moifatt, June 7th, 1912, Serial Numbers 702,242 and 702,243, but I do not wish to be limited to such application.

The invention consists in the various matters hereinafter described and referred to in the appended claims.

The invention is illustrated in the accompanying drawings, in which- Figure 1 is an endview of a sewing machine of the above type, showing my invention applied thereto;

Fig. 2 is a front view in cross section of the cutting device;

Fig. 3 is a view similar to Fig. 1, illustrating a modified way of attaching one of the shear blades;

Figs. 4 and 5 are detailed views of the cutting device and supporting bracket, from op osite sides;

ig. 6 is a detail view of the cutting device and supporting bracket, showing in full lines the normal position of the parts and in dotted lines the position of the parts when raised by the feed dog; and

Fig. 7 is a similar view showing the position of the parts when raised by the presser foot lever, the lever being given its maximum swlng.

In these drawings, 1 represents the bed plate of a sewing machine of the type above referred to, 2 the standard,'3 the needle bar, 4 the needle, 5 the feed dog, 6 the prcsser foot, 7 the presser bar, 8 the secondary resser bar which is connected to and moves in unison with the presser bar 7, 9 the work support and 10 the presser foot lifting lever. The movable trimming blade of the ma chine is shown at 11, and is clamped by retaining clamp and screw 12 and 12 to the supporting arm 13, which is clamped to the trimmer shaft 14 supported at the front end in bearings 16 on bracket 17 by clamp screws 18. An arm 22 operated from the main shaft oscillates the arm 13. An oil guard 23 beneath the bearing 16 catches the oil dripping therefrom. I

The numeral 24 represents a block which is clamped by suitable screws to the secondary presser bar. To this block is attached, as herein shown, by two screws 25, a bracket 26 extending downwardly to a point in rear of the presser foot'and having pivotally secured to it, by a screw 27, a curved arm 28 carrying at its lower end a shearing blade 29 and having at its upper end a spring connection 30 with the bracket 26. At the lower end of the bracket 26 is secured a pin 31 which passes through an elongated horizontal slot 32 in the shearing blade arm 28, and at its inner end passes into an open ended vertical slot 33 in the upper or secondary shearing blade 34, which is pivoted to the main shearin blade at 35. The outer end of this secon ary shearing blade 34 preferably rests against the lower side of the shaft bracket oil guard 23, although it may bear directly against the shaft if a guard is not employed; and when the presser bar is moved up and down by the action of the feed do and presser bar spring, or is moved up an down by the foot lifter 10 and the springs, the outer end of the arm of the maln shearing blade 34 which rests against the oil guard 23 will not only'swing the arm up on its fulcrum or pivot 35, but will on the upward movement of the presser bar, through the pin and slot connection 31 and 33, give a movement to the main shearing blade 29, thus giving .a joint shearing action to the two blades. The elongated slot 32 also acts as a stop for the pin and the spring tends to restore the parts to normal position; that is, with the shearing blades open ready for the shearing action when manipulated 37 the upward movement of the presser By referring to Fig. 6, it will be noted. that the free end of the upper blade 34 is normally disposed under and bearsagainst the oil cup] 23, and when the feed is raised the upper ade 34 is rocked'upwardly on its fulcrum, the fulcrum being at the free end of the blade. At the same time the lower blade 29 is moved upwardly and forwardly to a slight extent. Further it will be noted that this attachment is wholly disposed above and in spaced relation to the cloth plate, and it maintains this relation at all times, thus creating a free passage for the body fabric; the upward movement of the feed dog imparts to both jaws a shearing action of a length less than the upward movement of the feed dog; the mouth ofthe attachment extends rearwardly and, furthermore, the jaws are so arranged as to provide a normal open mouth for receiving the material to be severed/ This is true 1 when the machine is idle and'when the feed is in any position, and, therefore, under the normal operation of the machine the mouth of the attachment is always open to receive such material.

As shown in Fig. 7, when the foot lever is depressed to its maximum the mouth of the jaws is closed. Thus it will be seen that in the ordinary operation of the machine the mouth of the cutter is always open whether the feed dog is up or down, but when raised by the foot lever the jaws are closed. The advantage of this is that when the presser foot is raised by the action of the foot lever,

and therefore, the goods are not clamped upon the cloth plate, the operator can not insert the tape intothe jaws of the cutting attachment and perform the cutting action.

It will be noticed that, by reason of the connection between the bracket and the shearing blade arm and the secondary shearmg blade and. the main shearing blade on sald shearing blade rm, the shearing action titl may take place when the machine is at rest and there is no movement of the presserbar; by the operative drawing the material to be severed into the jaws, the action in such case i being that the material to be severed draws against the lower or main shearing blade,

- swings that on its pivot againstthe tension of the spring 30 and through the pin and slot connection 31-33 will cause the upper eas es or secondary shearing blade to swing downward and perform the cutting action.

In Fig. 3, a modification of-the invention is shown, in which, instead of the upper end of the secondary shearing blade coming into contact in the movement of the presser foot against the oil guard or other projection on the machine, it is pivoted to the lower end of a link 36, which atits upper end is pivoted as at .37 to the stationary part of the machine and in the upward movement of the presser bar this link 36 will force down the secondary shearing blade in the same manner as described in connection with the oil guard 23, shown in Fig. 1, and the action when the machine is not in operation is precisely the same as described in connection with the other figures.

Having thusfully described my invention,

what I claim as new and desire to secure by Letters Patent, is

l. The combination with a sewing machine having a work support, of a cutting attachment comprising cutting jaws disposed wholly above and in spaced relation at all times to the work support, means open ated by a movable part of thev sewing machine for actuating one of said jaws, and devices iorconnecting the jaws whereby the movement of said jaws by the sewing machine imparts a shearing action to the other aw.

chine including a feed dog having forward and backward and upward and downward movements, and presser toot of a cuttin attachment comprising shearing jaws, an means operated by the upward movement of thefeed dog for imparting to both jaws a shearing action of 'a length less than the upward movement of the feed dog.

3. The combination with a sewing machine including a feed dog havin forward and backward and upward and .ownward movements, and presser foot, of a cutting attachment comprising shearing jaws, means operated by the upward movement of the feed dog for imparting to both jaws a shearing action oi? a length less than the upward pivot to close against the other jaw.

. 5. A cutting attachment for sewing machines, comprising a bar having on its lower end a cutting jaw, and adapted to be secured 2. The combination with a sewing ma- 1 to a moving part of the machine, said cutting jaw being pivoted to said moving part of the machine and normally spring pressed in one position, a cooperat ng cutting jaw adapted in the upward bodily movement of the first cutting jaw to be swung on its pivot to cooperate with said first cutting jaw to sever the material between the jaws.

6. A cutting attachment for sewing machines, comprising a bar having on its lower end a cutting jaw, and secured to a moving part of the machine, said cutting jaw being pivoted to said moving part of the machine and normally spring pressed in one position, a cooperating cutting jaw adapted in the upward bodily movement of the first cutting jaw to be-swung on its pivot to cooperate with said first cutting jaw to sever the material between the jaws, and pivoted at its opposite end to a bar which is pivoted at its upper end to a stationary part of the machine frame.

7. A cutting attachment for sewing machines, comprising a bar having on its lower end a cutting jaw, and secured to the presser bar, said cutting jaw being pivoted to said bar and normally spring pressed in one position, a cooperating cutting jaw adapted in the upward bodily movement of the first cutting jaw to be swung on its ivot to cooperate with said firstcutting jaw to sever the material between the aws, and a pin carried by the part to which the first jaw is pivoted passing through a slot in the said jaw and securedto the second jaw.

8. A cutting attachment for sewing machines comprising a pivoted jaw, a second jaw pivoted to the first-named jaw, means whereby the first-named jaw is swung on its pivot through the action of a movable part of the sewing machine, and devices for caus ing the second-named jaw to be given a shearing movement through the movements of the first-named jaw.

9. A cutting attachment for sewing machines comprisinga pivoted jaw, a spring for moving said jaw in one direction about the ivot, a'second jaw pivoted to the first named jaw, and means cooperating with the second jaw for causing the jaws to be moved toward each other to sever the material placed between the same when the firstnamed jaw is moved about its pivotal support and in a direction opposite to the direction of the movement thereof by the spring.

10. A cutting attachment for sewing machines, comprising a bar adapted to be secured to a moving part of the machine, a main shear blade fulcrumed thereon, a second shear blade fulcrumed to the first shear blade and engaging a pin on the first shear blade shank, and an abutment with which the second shear blade contacts in the movement of the machine to cause cooperation of the shear blades.

11. A cutting device for sewing machines comprising a bar adapted to be secured to a moving part of the machine and including two shearing blades, one fulcrumed to said bar, and the other fulcrumed to the first shearing blade, and connections between the two, whereby the swinging of one or the other on its fulcrum will operate the other to cause cooperative closing action.

12. A cutting device for sewing machines comprising a bar adapted to be secured to a moving part ofthe machine and including two normally open shearing jaws, one fulcrumed to said bar and the other fulcrumed to the first, and pin and slot connections between the two, whereby the swinging of one or the other on its fulcrum will operate the other to cause cooperative closing action of the jaws.

In testimony whereof, I aifix my signature, in the presence of two witnesses.

ROBERT R. HUGHES, JR.

Witnesses:

RANDOLPH S. OswALD, LANSING ONDERDONK.

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