DE151931C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

The present invention relates to a drive for the fabric clamp of buttonhole sewing machines, in which the sewing of the side edges of the buttonhole by means of a jumping needle parallel to the buttonhole slit moving fabric and locking the ends of the buttonhole with easy up and down needle at the same time Double movement of the fabric clamp in parallel

ίο and perpendicular to the buttonhole slit. In order to bring about the double movement to be given to the fabric clamp during locking in the simplest possible manner, according to the present invention, the fabric clamp connected to a plate, which Slidable perpendicular to the buttonhole slit and one to the side of the buttonhole slit located pivot is pivotably mounted.

The subject of the invention is shown in the drawing in Fig. 1 by a top plan view, in Fig. 2 by a schematic representation of the fabric clamp movement during the manufacture of the locking stitches. .

From a graphic representation of the device for transporting substances during the Making the side stitches and indenting the interlocking fabric circuit and simultaneous interruption of the jumping needle movement has been removed, since this can be of any kind and as a principle, for example, from the older one Patent 126719 by the same inventor as known is assumed.

The cloth clamp labeled A ⁵ is connected to a slider E ^s , which is articulated by a push rod E ¹ to a switching disk Ε ^Ά , which can also be adjusted by hand by means of a handle e ^7. The slider E ^a is guided in a plate Q, the swingable and at the same time displaceable mounting perpendicular to the buttonhole slot forms the subject of the present invention.

The plate Q. has a cutout q ¹ in which a slider Q ^{1 is} arranged. The slider Q 'is loosely placed on a fixedly mounted round pin which has a screw cap g ^:>. With the plate Q, a plate P is firmly connected so that they BEZW. the plate Q. is able to experience both a rotation about the ^{pin carrying the slide Q. 1} and a displacement with respect to the slide Q. ^1. A rotary movement, in which the fabric clamp swings essentially parallel to the buttonhole slot, and at the same time a displacement perpendicular to the buttonhole slot is now given to the plates PQ by two groove washers N 0 , which are set in rotation by the drive mechanism of the machine, not shown in the drawing, when the buttonhole locking should take place. The groove washers NO are assumed to be seated on the same journal.

A driving pin r, which sits on an arm R of the plate P , protrudes into the groove of the grooved washer O. The shape of the

Claims (3)

The groove located in the grooved disk O is selected so that when the disk O is rotated, the fabric clamp experiences a straight movement perpendicular to the buttonhole slot.
^{A driving pin Z 4} , which sits on a slide L , protrudes into the groove of the grooved washer JV. The slide L is guided in guide pieces / and I ¹ and is maintained by the rotary movement of the grooved disk N ίο a short back and forth movement. The slide L transmits this movement through a pin Z ³ to the plate P. The coupling of the slide L to the plate P by the pin Z ³ takes place in such a way that the pin Z ³ simultaneously "has a slot I ^{2 of} the slide L and penetrates a slot ρ of the arm p ^{1 of} the plate P. The short back and forth movement of the slide L is transmitted to the plate P and the cloth clamp as a short swinging movement parallel to the buttonhole slot, as it is necessary for the locking stitch formation. The described mechanisms of the fabric clamp is issued during the locking movement, at which it successively occupies in Fig. 2 indicated different positions, which move up in simple and outgoing needle yields the indicated also in Fig. 2 Verriegclungsstichbildung. Incidentally, in the illustration in FIG. 2, the actual fabric clamp, the plate Q and the plate P are shown as a single plate which ends in a point which is intended to indicate the point at which the fabric is pierced by the needle. The connecting lines of the plate tips at the end of successive plate oscillations therefore represent the stitch position. Patent A ν claims: I. A drive for that. Fabric clamp of buttonhole sewing machines with jumping needle, in which the side stitches are created by jumping movement of the needle with simultaneous movement of the fabric clamp parallel to the buttonhole slot and the locking stitches running parallel to the buttonhole slot by simple up and down movement of the needle with simultaneous double movement of the fabric clamp parallel and perpendicular to the buttonhole slot characterized in that the fabric clamp is guided parallel to the buttonhole slot in a holder (Q) , which in turn is displaceable perpendicular to the buttonhole slot and pivotable about a pivot pin (q ^s j located to the side of the buttonhole slot, for the purpose of moving the fabric clamp ( A ⁵ J in the holder (QJ parallel to the buttonhole slit sewing the side edges of the buttonhole with a jumping needle and by moving the holder perpendicular to the buttonhole slit with simultaneous swinging movement of the holder, parallel to the button loc The buttonhole can be locked with a single up and down needle (I) . 2. An embodiment of the drive according to claim 1, characterized in that the cloth clamp holder (Q) is arranged displaceably on a slider (Q ¹ J placed loosely on a pivot pin, and by means of grooves or cam disks (O NJ) a shift relative to the slider (Q ¹ J corresponding to the material transport perpendicular to the buttonhole slot and a swinging movement around the pivot of the sliding piece (Q ¹ J corresponding to the back and forth movement of the fabric parallel to the buttonhole slot. 3. An embodiment of the drive according to claim 2, characterized in that the one drive groove disc (O) for the fabric carrier reciprocates a linearly guided slide (LJ , which moves its movement by means of a through a slot of the slide (L) and a slot A plate connected to the fabric carrier (PJ of the pin protruding through it transfers to the fabric carrier and thereby also gives the same an oscillating movement. 1 sheet of drawings.