US1813374A - Thread cutter for sewing machines - Google Patents

Description

July 7, 1931. N. H. wooLsEY 1,813,374

THREAD CUTTER FOR SEWING MACHINES Filed Aug. 21', 1928 [NVEN TOR M wa6 Patented July 7, 1931 UNITED STATES NAOMI H. WOOLSEY, OF LOS AN GE LES, CALIFORNIA THREAD CUTTER FOB SEWING MAGHINES Application filed August 21, 1928.

In sewing machine operation a common source of inconvenience and trouble is the loose ends of thread from spool and bobbin being carried down through the needle-hole by the needle beneath the throat-plate of the machine and then caught by the point of the shuttle and carried into the shuttle race, thereby breaking the thread and clogging the machine, preventing further operation of the machine until the tangled thread carried by the point of the shuttle into the shuttle-race has been removed. It will be apparent that the foregoing is not only a cause of inconvenience in the operation of sewing machines but is the cause of much loss of time which may be of the greatest importance to the operator; therefore an object of this invention is to prevent threads from being drawn into the shuttle race by the point of the shuttle, thereby clogging the machine.

Another object of this invention is to prevent the thread from knotting in the needle hole when the machine is in motion Without material under the needle, or when operating on fine, thin or soft material, thereby preventing soiling or tearing the goods.

Another purpose is to prevent thread from being drawn out of the needles eye when starting to sew.

Another object of the invention is to provide a device which enables the operator to cut thread with one hand.

Advantages of this invention are simplicity of construction, eifectiveness in operation and low cost of manufacture.

The accompanying drawings illustrate the invention:

Figure 1 is an enlarged plan view of my newly improved thread cutter.

Figure 2 is an end elevation of same.

Figure 8 is a side elevation of the thread cutter.

, Figure 4 is a perspective view of a portion of a sewing machine provided with the inven- 45 tion, showing it attached to the presser bar of the machine, and showing thread being held between the parallel sections of the thread cutter.

No. 1 indicates a fragment of a sewing machine in connection with which is shown the Serial No. 301,150.

usual bed-plate (2), needle-bar (3), throatplate (4:), and presser bar (5), to which the newly improved thread cutter (6) is attached. p

The thread cutter (6) comprises a body (7), which is bent to form springs (8) and (9) to grip the presser bar (5) to hold the thread cutter (6) in position, as shown in Fig. 4:. A bar (10) is rearwardly and downwardly extended from the body (7 and said bar (10) is bent as at (11) so that two sections of bar 10) lie parallel to and against one another, as is best shown in Fig. 3. The parallel edges of the bar (10) are formed v into a knife edge (12) for severing thread, and the free end of'the bar (10) is upwardly curved as at (13) to form an opening (14:) into which the threads (15) are to be drawn between'theparallel sections of the bar (10), which will sever the threads and clamp and hold the severed thread so the same will not be drawn from the eye of the needle, or drawn beneath the' needle plate (4;) in which case the thread would be caught by the shuttle (which is not shown in the drawings), knotting the thread and clogging the machine, and which action is readily understood by those skilled in the art towhich this invention appertains.

)Vhat I claim is:

1. A thread cutter for sewing machines, comprising a bar, said bar having a reverse bend with two flat parallel portions, the said bar having a resiliency to press said porx tions tightly together forming a clamp, one end of the bar having means for attachment to the presser bar of a sewing machine, the other end forming a guide for inserting thread in the clamp and at least one of the portions having a sharpened edge adapted to sever thread clamped between the portions 7 of the bar.

2. A thread cutter for sewing machines, comprising a resilient fiat bar having a reverse bend whereby two portions are brought into contact, the bar having a resiliency forcing said flat surfaces into clamping relation one to the other adapted to hold thread, one portion of the bar having means for attachment to the presser bar of a sewing machine,

Isa

the other end of the other portion forming an entrance guide for thread between such end and the presser bar and both of the said portions of the bar having a sharp cutting edge contiguous to each other and forming a thread cutter for thread clamped between the portions of the bar.

3. A thread cutting implement comprising a strip of flat metal having a reverse bend forming upper and lower blades, the said metal being resilient and bringing the blades into close contact to form a clamp, means connected to one blade to attachto a supporting structure, the end of the other blade being bent slightly away from the first mentioned blade forming a guide for inserting the thread, both of said blades being dull on one edge and sharpened on the other edge, whereby thread may be drawn from the dull towards the sharpened edge and severed by pressing the thread against the sharpened edge of either blade.

4. A thread cutter for sewing machines, comprising a strip of flat metal having a reverse bend, the strip forming a lower and an upper blade, the lower blade having attaching means adapted for connection to the presser bar of a sewing machine, the upper blade having a bent up tip end from the lower blade adapted to form a guide for inserting thread between such bent up end and the presser bar, each of the blades having a chill and a sharp edge, the two dull edges being on one side andthe two sharp edges being contiguous, whereby thread is adapted to be drawn from the dull to the sharp edges and severed at such sharp edges, the thread being held clamped between the two blades.

NAOMI H. WOQLSEY.

Images