HANDLING SYSTEM FOR SEWING MACHINES

Abstract

This is a needle bar handling system for a sewing machine. More specifically, it is a handling system that allows the length of the needle bar stroke to be varied according to the thickness of the fabric to be sewn.

Claims

1. Handling system for the needle bar of a sewing machine, comprising a needle bar with a vertical shaft to which a crank is connected which in turn is connected to a cylindrical element which is fixed coaxially to a rotating shaft, wherein the crank is connected to the cylindrical element by means of an adjustment device, the crank being pivoted with a pin to the adjustment device, the adjustment device being adapted to adjust the position of the pin with respect to the rotation axis of the rotating shaft; wherein the adjustment device comprises a fixed element which is mounted stably on the cylindrical element, and a movable element to which the crank is pivoted, the movable element being fixable to the fixed element in variable positions; wherein the movable element is translatable with respect to the fixed element; characterized by the fact that at least one slotted hole is formed in the movable element, the at least one slotted hole being penetrable by a screw to be screwed into a threaded hole formed in the fixed element.

2. Handling system according to claim 1, wherein the movable element is translatable with respect to the fixed element according to a radial direction with respect to the cylindrical element.

3. Handling system according to claim 1, wherein the at least one slotted hole develops according to a radial direction with respect to the cylindrical element.

4. Handling system according to claim 1, wherein the fixed element includes two lateral shoulders between which the movable element can move.

Description

[0024] Further features and details can be better understood from the following description, given as a non-limiting example, as well as from the annexed drawing, wherein:

[0025] FIG. 1 is an axonometric view of a movement system, according to the invention, of the needle bar of a sewing machine;

[0026] FIG. 2 is a side view of the handling system in FIG. 1.

[0027] With reference to the attached figures, FIG. 10 indicates a handling system of the needle bar of a sewing machine as a whole.

[0028] The handling system 10 includes a needle bar 12 including a vertical shaft 14 and three sewing needles 16 fixed below the vertical shaft 14.

[0029] A crank handle 18 is connected to the vertical shaft 14, which in turn is pivoted to an adjustment device 20 by means of a pin 19.

[0030] The adjusting device 20 is fixed to a cylindrical element 22 mounted coaxially on a rotating shaft, not shown in the figures, but configured according to the known art.

[0031] The adjusting device 20 comprises a fixed element 24 and a movable element 26.

[0032] The fixed element 24 is permanently mounted on the cylindrical element 22 by means of two first screws 28 and includes two side shoulders 30.

[0033] The mobile element 26, which is received between the two side shoulders 30, is fixed to the fixed element 24 by means of two second screws 32 which pass through two slotted holes 34 in the mobile element 26.

[0034] Consequently, by loosening the two second screws 32, it is possible to move the mobile element 26 between the two side shoulders 30 of the fixed element 24 and modify the distance between the pin 19 and the center of the cylindrical element 22.

[0035] This adjustment is possible because the translation of the mobile element 26 with respect to the fixed element 24 takes place in a radial direction with respect to the cylindrical element 22.

[0036] In fact, the development of the slotted holes is in the radial direction with respect to the cylindrical element 22.

[0037] As this distance increases or decreases, the vertical shaft stroke 14 and therefore the entire needle bar 12 is increased or decreased respectively.

[0038] The movement system 10 according to the invention allows, therefore, to vary the length of the needle bar stroke easily and quickly, so as to adjust the action of one or more needles on the fabric as its thickness changes.