SU367199A1 - TOOL FOR CUTTING THE EDGE OF MATERIAL ON THE SEWING MACHINE - Google Patents

Description

one

This invention relates to sewing machines. When sewing shoes with leather-lined shoes, sewing machines equipped with a knife device are used to simultaneously trim the excess edge of the leather lining. In the manufacture of various garments, sewing machines equipped with a knife device are also used.

It is known to trim the edge of a material with a swiveling machine, consisting of a knife mounted on a rod, which is brought into reciprocating post-movement by means of a crankshaft-connecting rod mechanism connected with a drive and a control handle.

The known device has a complex structure, and therefore does not ensure reliable operation on machines operating at high speeds.

It is not easy to simplify the design of the crank of the crank mechanism consists of two links hinged to each other, the axis of which is kinematically and mechanically connected with the control handle.

FIG. 1 shows the proposed device, a general view; FIG. 2 - kip.matichesk scheme of the device; in fig. 3 - scheme of the device.

The device is mounted on the cornea /, which is fastened with two screws 2 to the sleeve 3 of the sewing machine. The knife 4 is mounted on the holder 5, fixed by screw 6 on the rod 7. The crank roller 8 is installed in the corns / sharnconodings and 9, for example, from the electric motor by

belt 10 and pulley //. On crank 12 of roller 8, link 13 is movably mounted, the other side of which, by means of axis 14, is pivotally connected to links 15 and 16. Link 13 and 15 are the connecting rod of the mechanism. The link

15, on one side of the shaft 17, is connected to a leash 18 fixed to the rod 7. The connecting link 16 is connected to the crankshaft 19, which is connected by a roller 20 to the handle 21, and the shaft of the roller 20

coincides with the axis of the roller roller 8. On the handle 21, there is a pin 22, which, unnumbered in the walls of the plate 23 under the action of an expanding spring 24, sets the handle 21 in the right or left side.

FIG. 3 shows a diagram of the operation of the device. If the handle 21 is turned clockwise, crankshaft 12 moves connecting link 16 to the left, link 13 and

15 is straightforward and link 16 is perpendicular to it (see Fig. 3a). In this case, the rod 7 is onus by the magnitude of O, and Iozh 4 stands in a needle plate with a knife (not shown in the drawing).

and performs reciprocating motion on R. velcciu. When the knob is rotated

2J counterclockwise, the crank 12 moves the axis 14 through the crank 16 to the right and the links fix the position, as shown in FIG. 3 b. In this case, the links 15 and 13 are, in fact, a right angle, and the link 16 is a straight line with a link 15. In this case, the rod 7 is agitated: upwards on the clamp O, and the knife 4 comes out of contact with the knife of the needle plate . The rotation of the crankshaft roller does not cause the reciprocating movement of the rod 7, i.e. the knife is turned off. The proposed design allows you to quickly and easily turn the knife on and off during the operation of the machine.

Subject invention

A device for trimming the edge of a material on a sewing machine, consisting of a knife mounted on a rod, with: driven in reciprocating motion by means of a crank mechanism, which is kinematically connected with a drive and an adjustment knob, characterized in that In terms of design, the crank of the crank mechanism consists of two links hinged between each other, the axis of which is kinematically connected with the lever of the device.

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