DE294175C - - Google Patents

Description

IMPERIAL

PATENT OFFICE

There are gate balancing devices for embroidery machines, especially for automatic embroidery machines with springs, in which the change in the tension of the spring depends on the detrimental effect of the height of the gate on the balance is erased, wherein the spring engages with a roller on a guide surface of a lever that the transfers balancing force to the gate lever.

The present invention is a new construction for this purpose, in which the running surface for the roller is arranged on an arm connected to the balancing spring and seated on a shaft, while the role on the lever that transfers the balancing force to the gate levers sits, which is arranged to oscillate on another shaft. This is supposed to be a real one Cooperation between role and area are made possible in the long term.

The object is shown in the drawing. It shows

Fig. Ι a front view of an automat5 embroidery machine,

Fig. 2 is an enlarged side view seen in the direction of arrow A, and

3 is a view of the machine, also enlarged.

It denotes 1 the embroidery machine on whose shaft 2 a bevel gear 3 sits, which is in a down on a vertical screw spindle 4 attached bevel gear 5 meshes. This screw spindle 4 works with a on the same shifting, internally threaded nut 6 together, whose Laterally protruding parts of the vain rod 7 are taken up. The rod 7 is through a bracket 9 attached to the frame 8 is guided. The upper end of the rod 7 is articulated with connected to the gate support lever 10, which at 11 is rotatably attached to the machine frame 8. On the rod 7 is a three-arm articulated Fastened lever 12, which is rotatably mounted on frame 8 at 13. The upper arm of the three-armed lever 12 is by a pulling member 14 with at least one as an angle lever trained gate support lever 15 connected; these levers 15 are on the machine frame its entire length attached distributed. The lower arm of the lever 12 is through a tension member 16 connected to a lever arm 17. Each of the trains 14, 16 can be at least in be supported at one point to avoid sagging. There are z. B. for the tension member 14 two support bearings 18, 19 and a support bearing 20 for the tension member 16 are provided.

The lever arm 17 is on one in the embroidery machine frame 8 mounted shaft 21, with which an arm 22 is firmly connected is. The arm 22 is articulated to the gate support lever 15 by means of a tension member 23. A roller 24 is attached to the arm 17. The arms 17 and 22 form in connection

Claims (1)

with the shaft 21 a lever through which not only the devices supporting the gate for the purpose of moving in one direction by means of the lever 12 with the embroidery machine are connected, but also the balancing force of the compensating spring described below on the gate support devices and consequently also on 'the gate 36 is transmitted. In consoles 25 and 26 of the embroidery machine frame 8 is a shaft 27 is mounted on which a worm wheel 28 sits, which engages in a worm 29 mounted in the console 25. The worm shaft 30 has a square end to enable the tension of the balancing spring 31 to be adjusted with a key. That one end of the coil spring 31 is connected at 32 to the worm wheel 28, while the other end is connected at 33 to a pulling arm 34 which is fastened on the shaft 27 is and can vibrate with the same. The shaft 21 is on that Side of the shaft 27, after which the arm 34 moves with increasing tension of the spring 31 emotional. The pull arm 34 is provided with a guide surface 35 for the roller 24 of the arm 17 provided so that the point of contact of the arms 34 and 17 is movable and the effective Length of the pull arm 34 with its position, d. H. is changed with the tension of the spring 31. The guide surface 35 is the Gatt ^ rmoment trained accordingly. The mode of operation of the described balancing is as follows: If the gate is in its middle position shown in the drawings, then the gate is balanced by the spring 31. The effect of the spring 31 remains Transmission ratio for this position of the parts that transfers to the gate support lever constant. If the gate moves downwards, the lever arm 17 is referred to rotated to the left in Fig. 3, taking the pull arm 34 with him. This will the tension of the spring 31 is known to be increased. There is now an overbalance of the gate not a, because the roller 24 of the lever arm 17 during the movement of the Arms 17, 34 along the guide surface 35 as a result of the relative displacement of these arms 17 and 34 is moved outwards. So while the tension of the spring 31 increases becomes, the leverage ratio, which in the transmission of the spring action on the gate support lever comes into its own, also enlarged, so that the balancing Effect of the spring remains essentially the same. If, on the other hand, the gate 36 is moved upwards, the lever arm 17 becomes moved to the right, then the arm 34 is also moved to the right. this has with the result that the tension of the spring 31 is reduced. However, since the role 24 lengthways the guide surface 35 is moved inward and, as a result, the transmission of the balancing effect of the spring 31 serving lever transmission ratio decreased is compensated for the decrease in voltage, and consequently that of the spring 31 exerted on the gate support lever balancing effect remain practically the same. Patenτ-Α νSPRUch: Gate balancing device with spring for embroidery machines, especially for automatic embroidery machines, characterized by an arm (34) seated on a shaft (27) and connected to the balancing spring, against its guide surface (35) a seated on another shaft (21), the lever (17) with a roller (24) that transfers the balancing force to the gate levers is present. 1 sheet of drawings.