DE39396C - Innovation in the buttonhole sewing and locking device for shuttle sewing machines, which is protected by patent No. 24441 - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

CLASS 52: Sewing machines.

ALBERT STEIN in ST. PETERSBURG.

Patented in the German Empire on June 29, 1886.

As with the well-known buttonhole and lockstitch sewing machines, the needle is moved back and forth stitch by stitch through the multiple bent lever h , which counteracts this with its lower end on the slide c of the spring f , because it is with a slide h ¹ encloses at its upper end in a self-crossing double curve in the cylinder k on the main shaft of the sewing machine. Here the axis h ^{s of} the lever h and the slide c are now mounted in the machine head, in contrast to the previously only known composition of the buttonhole apparatus parts on a special base plate attached to the machine head.

The main new features of this machine are the device which is used to adjust the stitch length on the buttonhole edge and the bar at will, and the device which is used to release the slider h ^l from the cross curve at the same time as the other Obtaining the buttonhole apparatus.

The spring f can move the slide c, which is connected to the special needle prism bb parallel to it, until it is applied with its setting i to a fixed stop m , FIGS. 7 and 8. The spring f and also the lever h touch the Slide c not directly, but only on the adjustment part i, Fig. 9. This fork-shaped adjustment part is inserted rotatably into the slide c with a pin i ¹ and against loosening from the slide with a screw i ² in one to the hole of the pin i ^l vertical slot secured at the non-stepped end of the slide, Fig. 1. A long adjusting screw / with a hand knob goes parallel to the slide axis from, outside through the bottom wall of the hollow and filling body d and lengthways through the slide c, ¹ in this in the nut thread sitting through. The end of this screw meets the screw z ² . Because the spring f always only presses at the top, the lever h only ever at the bottom against the wide and fork-shaped adjustment part i , both press ^{the screw f 2} against the end of the screw Z, Figs. 7 and 8, with their pressure.

If the adjusting screw / has been screwed in more deeply by turning its hand knob, it has turned the adjustment part a little about its pin i ¹ and the entire adjustment part is now at an angle, Fig. 8. Because of the inclined position, the slide c is extended by the spring / can be pushed to the right, Fig. 8, before the adjustment part hits the stop m , and to the other side the slide can also be pushed further by the lever h , because the point of application of the lever on the adjustment part is due to the inclined position of the slide now accordingly further to the right than before, and that is how much the slide moves further in the other direction.

By changing the inclination of the adjustment part by screwing it in and out

Claims (2)

With the screw Z, which is conveniently at hand, you have a means, the lateral stroke the sewing needle on both sides from the central needle hole evenly depending on the need to change. In order to avoid unnecessary wear and tear on the slide h ¹ in the cross curve when sewing ordinary seams, it is good to remove the slide h ^l on the lever from the cross curve. This pulling out of the slide occurs with the disengagement of the whole buttonhole apparatus by setting the stop arm e in its high position, FIG. On the inner wall of the hollow cylinder body d along with the stop arm e moves the nose n attached to this, Fig. 2 and 6. When the stop arm is inserted into the high position, this nose pushes back a bolt ρ that is tapered at its end, which, Pre-pressed by a spring in the sewing machine head side surface below the machine arm, lies in its prismatic guide. At right angles into the machine head, which is hollow here, protrudes from the bolt ρ, a pin 0, FIGS. 7 and 8, which extends through a hole in the lower end of the lever h and through the fork i . When the bolt ρ retreats from the position in FIG. 6 to that of FIG. 2, the pin o takes the lower end of the lever h with it and thereby rotates the lever around the. Neck of its fastening screw h ² and thus pulls the slider h ^J out of the cross curve k . The neck of the fastening screw h ² thus serves the lever h to a second joint axis which is at right angles to the former. Godfather τ-An Proverbs: The mechanism for moving the protected by means of claims 1, 2 and 3 Needle slide respectively. In and out of activity of the under No. 24441 patented buttonhole sewing and locking devices for shuttle sewing machines: ι. The engagement of the spring f the one hand and the lever h on the other hand to an in the slide c rotatable Einstelltheil i, which with the adjustment screw I more or less inclined against the slide c can be adjusted, whereby the stroke of the slider c on both sides of its central position gleichmäfsig changed, and thus the buttonhole edge and backtack stitch length can be adjusted. 2. The attachment of the lever h with a second hinge axis h ' ² sitting vertically on its pivot axis h ^s , so that the lever itself only needs to be rotated about this second hinge axis to release the lever from the cross curve. For this purpose ι sheet of drawings.