US1511616A - Thread clipper for bag machines - Google Patents

Description

M. R. KENDALL THREAD CLIPPER FOR BAG MACHINES Filed Sept. 14 1920 Patented Uct. 14, 1224..

ivianvm a. KENDALL, on nu'rcnrnson, KANSAS.

THREAD CLIPPER FOR BAG- MAGHINESL Application filed September 14, 1920. Serial No. 410,296.

To all whom it may concern:

Be it known that I, MARVIN R. KENDALL, a citizen of the United States, residing at Hutchinson, in the county of Reno and State of Kansas, have invented new and useful Improvements in Thread Clippers for Bag Machines, of which the following is a specification.

The object of the invention is to provide readily attachable means for use in connection with bag sewing machines, such as are used in bag and sack factories, for severing the thread or twine employed for sewing or stitching these receptacles without requiring special effort, manipulation, or movement on the part of the operator and therefore without interrupting the work, and consequently under such conditions as to avoid loss of time; and more particularly to provide means for the purpose indicated which may be actuated, or set and released, and controlled, for example, by the treadle which serves to start and stop the sewing or stitching machine, either through a switch, if electric motive power is used, or though any equivalent means approved in the art, to the end that when a seam or run of stitching has been completed the movement of the treadle to stop the needle will cause the severance of the thread, so that the material may be adjusted at once for the succeeding seam or line of stitching.

With this object in view the invention resides in an organization of elements of which a preferred embodiment is illustrated in the accompanying drawing, wherein Figure 1 shows aside view of the apparatus applied in the operative position to a bag stitching machine, the clipper being shown in full lines in the closed or cutting position and in dotted lines in the open or set position.

Fig. 2 is a plan view of the same.

Fig. 3 is a detail section on the line 33 of Fig. 2.

Fig. i is a detail of one end of the yoke.

Fig. 5 is a section on line 5-5 of Fig. 2.

Essentially the device consists of a reciprocable yoke 10, actuated and yieldingly i1npelled in one direction by a spring 11, a cutter 12 of which. one of the complemental blades is connected with the yoke, for move ment thereby, and a latch or lock 13 for re taining the yoke and cutter in a set position in opposition to the cutter-actuating tendency of said spring and adapted to be tripped by the treadle 1 1 of the sewing machine when the latter is moved to check or interrupt the operation of the machine;

The cutter, as shown, is in the form of shears having blades 15 and 16 pivotally connected at 17 and extended to form arms 15 and 16 of which the former is pivoted to a clip 18 secured to thebed-plate 19 or equivalent convenient part of the sewing machine and the latteris pivoted to the end of the yoke 10. The yoke consists of a'rod plane at the rear side of and close to the machine arm while the stem or upright of the yoke is arranged to the right hand of the standard of the arm, the usual space 00- cupied by the work is left unobstructed so that no change in the customary handling of the goods or material or of the sacks is made necessary by the presence of the clipping device.

It will be seen also that the connection of the blades of the cutter by what may be termed a floating pivot, movable in a path concentric with the pivot 18 of the arm 15 on the clip 18, serves in the operation of the cutter to cause a swinging movement or alternate advance and retraction of i the blades,the retraction occurring as the cutter is opened to the set position shown in dotted lines in Figure 1, and the advance movement occurring as the cutter closes under the action of the spring to clip the thread, so that the ends of the blades do not project objectionably beyond the needle 26 and interfere with the view of the operator or the guidance of the work during the stitching operation of the machine.

' Beneath the machine table the yoke stem is connected by a swivel joint 27 with a rocking lever 28, fulcrumed upon a pendent bracket 29 attached to the table, and from the rocking lever extends a connecting rod 30 to an operating lever 31 fulcrumed upon a bracket 32 secured to the floor adjacent to the machine treadle 14, and' movable ina vertical ,pIane parallel therewith.- Tweeterating lever is disposed in the path of ,an

arm 33 carried by the treadle to the end that when the latter is moved the 'directioii of the arrow in Fig. l to start the machine the rocking lever is tilted to open or set the cutter and place the spring 11 under tension,-in which positions the parts are maintained, by the latch 13 whiclri'engagesgthe operating leveryas shown in Fig.3; The

' latch :has a shoulder 34; for this purpose, and

maybe yield-ingly held 'in position to engage the lever as" by?a'spring 35,; or its equivalent. In the ipathof movement in the opposite di- In adopting theapparatus to various types :sizes. of machines in connect-ion with whichra t'hread clipper may be employed it "desirable vto provide for certain adjustinents, relatively, "ofjt'he elements thereolf, andtherefbre-the'pin 24: at the terminal of the yokeis threaded for a stop nut 25 in ac'ldition to the holding nut 21), and the stem of the yoke is threaded to receive a nut 27 for engagement with the eye of the swivel 27. Also, the connecting rod 30 is made of extensible form with. its sections 3O 3O overlapped and secured by the collars 30 having setscrevvs 30?, or equivalent means.

What I claim is:

In combination with a controlling treadle for stitching machines, movable in opposite directions, a thread clipper including fulcru-nied shear blades one of which is mounted on a fixed pivot thereby to permit the fillcrumed blades to swing in an arc, an arm connectedwith the other of said blades, a compressible spring connected with said arm, a lever connected with said arm and pivoted to the machine, another leverpivotally supported adjacent the treadle and operatively connected with said first men tioned lever, meanscarried by the treadle for engaging with the last mentioned lever at one side ofits pivot,- and a latch device controlled by. the treadle and also adapted to engage with the said-last mentionedlever.

MARVIN R. KENDALL.

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