Sewing – Stitch forming – Zigzag
Patent
1984-10-10
1986-10-28
Schroeder, Werner H.
Sewing
Stitch forming
Zigzag
112315, D05B 302
Patent
active
046192140
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention has as its object a sewing machine, comprising elements for lateral control and positioning of the needle holder bar and for the adjustment of the amplitude and the direction of the movement of the material to be sewn.
A sewing machine is known such as in Swiss Pat. No. 277,952 in which the lateral movements of the needle holder bar and the advance of the feed are controlled by two cams, fastened in a removable way on a drive shaft, in continuous movement, that can be replaced by other interchangeable cams.
By the present invention, an improved arrangement is presented wherein separate, multi-faced cams each controlled by an individual servomotor are located in the machine upper and lower frames and are regulated by suitable control means such as one or more microprocessors to respectively manipulate the lateral needle bar movement and feed dog movement. Additionally, the upper frame cam serves to immobilize the needle bar. In this manner, the two permanently installed cams may be operated in a plurality of coordinated modes to achieve numerous stitching patterns without the necessity of exchanging cam elements as in many prior known machines.
SUMMARY OF THE INVENTION
To automate, simplify and increase the sewing capabilities, the machine according to the invention is characterized in that, on the one hand, it comprises a first servomotor that drives at least two cam portions, or faces, the first face making it possible, by contact with a first feeler, to assure the lateral positioning of the needle holder bar, and the second face working with the first face against which a third feeler rests to assure the disengaging of the needle bar, while a second servomotor drives at least a cam face that determines, by contact with a fourth feeler, the amplitude of the forward movement or the backward movement of the material to be sewn.
BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawings diagrammatically and by way of example show an embodiment of the machine according to the invention.
FIG. 1 is a partial view, showing the upper arm of the machine in front elevation with cutaways.
FIG. 2 is a partial view of it, showing the head of the machine in section along II--II of FIG. 1.
FIG. 3 is a view in larger scale, partially in axial section, of the needle bar, shown in FIG. 2.
FIG. 4 is a view similar to FIG. 3, showing the needle bar in the disengaged position.
FIG. 5 is a view in perspective of the control cam, shown in FIGS. 1 and 2.
FIG. 6 is a diagram of the functions of the cam, shown in FIG. 5.
FIG. 7 shows a variant of the disengaging element of the needle bar.
FIG. 8 is a partial top view with cutaway of the lower frame of the machine.
FIG. 9 is a view in cross section along IX--IX of FIG. 8.
FIG. 10 is a view in cross section along X--X of FIG. 8.
FIG. 11 is a view in cross section along XI--XI of FIG. 8.
FIG. 12 is a view in cross section along XII--XII of FIG. 8.
FIG. 13 is an exploded view, seen from right to left, of FIG. 12.
FIG. 14 is a view in section of it along XIV--XIV of FIG. 8.
FIG. 15 is a view in section along XV--XV of FIG. 14.
FIG. 16 is a diagram of the functions of the control cam, shown in FIGS. 8 and 9.
DESCRIPTION OF THE PREFERRED EMBODIMENT
As shown in FIGS. 1 and 2 of the drawings, the sewing machine comprises an upper arm or frame U with a tubular needle bar 1, mounted to slide in a swivelling cradle 2, the longitudinal reciprocating movement of needle bar 1 being assured by a journal 3, connected to a connecting rod 4 and driven by an eccentric plate 5 mounted on main drive shaft 12 of the machine.
As shown in FIGS. 5 and 6, a first cam 29 comprises two laterally presented faces B and C for controlling zig-zag sewing. To do this, cam 29 is subjected to an alternating oscillating movement of determined amplitude by a first servomotor 28 as depicted in FIGS. 1 and 2. In straight sewing, the lateral positioning of a needle N attached to needle bar 1 is also controlled by the angular position of cam 29, determined by servomotor
REFERENCES:
patent: 2976830 (1961-03-01), Vigonelli
patent: 4120254 (1978-10-01), Herr et al.
patent: 4195583 (1980-04-01), Matsumoto
patent: 4276840 (1981-07-01), Takemoya et al.
patent: 4284016 (1981-08-01), Matumura
patent: 4326472 (1982-04-01), Yamashita et al.
patent: 4327654 (1982-05-01), Odermann et al.
patent: 4385573 (1983-05-01), Brienza
Baruffa Olindo
Jimenez Antonio
Falik Andrew M.
Mefina S.A.
O'Brien Anthony A.
Schroeder Werner H.
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