SU1641914A1 - Device for moving work in sewing machine - Google Patents

Abstract

The invention relates to light industry, in particular, to means for moving stitched materials in a sewing machine. The aim of the invention is to improve the quality of the stitching by providing a linear trajectory of movement of the rail at the time of moving the material and reducing the wear of the working bodies by eliminating their contact in the absence of material. The device contains a transporting rail and presser foot, which, when interacting, ensure the straightness of the rail's trajectory at the time of material movement due to the free and spring-loaded installation of the front rocker arm on the rail lifting shaft and selection of spring stiffness, which presses the foot to the material, from the condition of its immobility when moving material. 3 il. cl

Description

The invention relates to mechanical engineering, in particular, to means for moving stitched materials in a sewing machine.

The purpose of the invention is to improve the quality of the stitching by providing a straight path of movement of the rail at the time of moving the material and reducing the wear of the working bodies by eliminating their contact in the absence of material.

Fig. 1 shows a kinematic diagram of the mechanism for moving a material; figure 2 - the mechanism, a general view; on fig.Z - section aa in figure 2.

A device for moving the material of the sewing machine is located in the body (not shown) of the sewing machine and contains means 1 for adjusting the stitch length, a device 2 for pressing the material, made in the form of a spring-loaded rod 3 with a foot fixed on it 4, a needle

plate 5, shaft b of raising rail 7 and shaft 8 of horizontal movement of rail are connected by means of rear rocker arms 9 and 10, connecting rods 11-13 with eccentrics 14 and 15 mounted on drive shaft 16. On shaft of horizontal movement of rail the front arm is also fixed 17, movably connected to the connecting rod 18 of the rail 7.

On the lifting shaft 6 of the rail 7, the front rocker 19 is freely mounted, which is spring-loaded by the spring 20. When there is no material under the pad with the spring 20, the front rocker 19 is pressed against the retainer 21. screwed into the machine body. In the presence of material under the foot spring 20 through a kinematic chain containing front rocker 19, connecting link 22, rod 18 slats, presses the rail 7 to the material.

about

Jx

you

In the device for pressing the material, a screw-controller 23 is provided, limiting the downward movement of the spring-loaded rod 3 with the foot 4 fixed on it, as well as the lever for raising the foot 24 and the Stiff spring 25.

The device works as follows.

Using a screw - adjuster 23, set the necessary gap between the foot 4 and the needle plate 5. After the foot 4 is raised, use the lever for lifting the foot to put the material under the foot 4 and sew it together. From the drive shaft 16, through eccentrics 14 and 15, connecting rods 11-13, rocker arms 9 and 10 receive movement of the rail lifting shaft 6 and shaft of the horizontal rail moving 8, the connecting rod 18 of the rail 7 receives the horizontal component of its movement, and through the rail lifting shaft 6, a spring 20, the front beam 19 and the connecting link 22 are the vertical component of the movement.

Due to the elastic coupling between the links in the kinematic chain of the rake lifting shaft, the tooth of the latter rises above the needle plate 5 by a certain amount, depending on the gap between the plate 5 and the foot 4, which is installed depending on the thickness of the materials being sewn and their physical and mechanical properties. In this case, the force generated by the spring 20, with which the rail 7 presses the material against the foot 4, is much less force in the device 2 to press the material created by the rigid spring 25, as a result of which there is no rise of the foot 4 during transport and the working movement of the rail occurs lines.

The use of the proposed material transfer device in comparison with the prototype improves the quality of the obtained

lines provided by the absence of shrinking of layers of material caused by non-linear working movement of the staff. In addition, the wear of the surface of the staff and the pads is reduced due to their contact after the end of the cross-linking of materials. Therefore, the device is particularly advisable to be used in machines that perform technological operations with a small machine time.

Claims (1)

Invention Formula A device for moving the sewing machine material, comprising a fabric engine mechanism, which is a conveyor rail, kinematically connected by means of front rocker arms and a connecting link to the lifting and horizontal displacement shafts installed in the machine body, and by means of rear rocker arms and connecting rods with eccentrics, mounted on the drive shaft, the presser foot mechanism in the form of a spring-loaded rod, means for adjusting the stitch length, characterized in that, in order to increase the quality twa stitches by providing a straight linear path for the slats in the moment of material movement and reduction of wear of working bodies due to the exclusion of their contact in the absence of material, the front rocker shaft of the lifting rail is installed freely and spring-loaded from the bottom by a twisted cylindrical spring mounted on this shaft, the spring stiffness of the presser bar of the presser foot is selected when moving the material, and the case is equipped adjustable limit stops turning the front rocker up and moving the rod with the foot down. 23 1 one 22 Editor I. Casarda Compiled by Y. Koval Tehred M. Morgental A-A (w & e) rh FIG 3 Proofreader N. Revska