Sewing – Stitch forming – Feeding work material
Patent
1983-06-24
1985-04-23
Hunter, H. Hampton
Sewing
Stitch forming
Feeding work material
112323, D05B 2722, D05B 2724
Patent
active
045122733
DESCRIPTION:
BRIEF SUMMARY
This invention is related to sewing machines, more particularly to the feeding mechanism in the base of the sewing machine.
Problems caused by large size and large numbers of elements having a number of points at which play occurs are usual in the feeding mechanisms of most sewing machines. Large distances for transferring actions and elastically in links, and the like, lead to inaccuracy which is impossible to adjust. With regard to the assembly, it is unsatisfactory that a plurality of details must be inserted and adjusted directly in the body of the machine. An alternative to this is the assembly of the whole mechanism into a feeding module outside the machine and putting it into place without any time-consuming adjustments. When something is wrong with such a module it can easily be taken out of the machine to be mended or changed.
By the present invention it is presented a compact loop-taker and feeding module which essentially reduces the problems occurring in feeding mechanisms as above discussed. The small number of elements of the module and its smallness make a reduction of the number of points of play as well as of the elasticity of the system. Due to the fact that the shuttle mechanism is also in the module two functions of the machine according to the invention are gathered in one module. This leads to still another simplification of the work of adjustment in that the mutual time-setting of the hook and the feeder is carried out when assembling the module, after which the feeder and the hook follow in unison all time-settings of other instrumentalities in the machine. The problem of simplifying the assembling and adjustment of the hook and feeder mechanism is solved according to the invention in that the drive and adjustment means of the feeder are located in a frame which by means of fixing and adjusting points is applied to the base portion of the sewing machine.
An embodiment of a mechanism according to the invention is described by way of example in the following with reference to the accompanying drawing in which in FIG. 1 is a view of a mechanism according to the invention in perspective, FIG. 2 is an exploded sketch of the mechanism, FIG. 3 is a vertical projection of the same and FIGS. 4a and 4b are cross sections of a level control member of a feeder showing a feeding position (a) and a lowered position (b).
The hook- and feeder mechanism module in accordance with the invention has a base plate 10 with screw holes 11 for screws (not shown) for holding the module in corresponding holes in the machine body (not shown) of the sewing machine. A vertical main shaft 13 is secured to the plate 10 (FIG. 2) and a toothed wheel 14, the wheel 14 being driven by a transmission belt 15 from the motor not shown of the machine. A mitre gear 16 journalled on the shaft and secured to the toothed wheel 14 meshes with a corresponding gear 17 (FIG. 3) on a horizontal hook shaft 18 which is also secured to the plate 10. The gears 16, 17 step up of the rotations so that the hook has double the r.p.m. as the toothed wheel 14. A hook carrier 19 journalled on the hook shaft drives the hook 20 (FIG. 1) in rotating movement in the vicinity of the lower end position of the needle. The top of the mechanism is covered by a stitch plate 21 (FIG. 2) sunk in the working surface (not shown) of the sewing machine and can be lifted away so that the mechanism becomes visible. On the underside of the stitch plate a couple of pins 23, 24 protrude, and a feeder 25 is journalled on pins 23, 24, by means of a couple slots 26, 27 extended in the material feeding direction. The feeder is plate shaped, having with a couple of stand-up rows of feeding teeth 28, 29 which protrude in a couple of slots 30, 31 in the stitch plate. Due to the guidance of elements 23, 26 and 24, 27 the rows of teeth 28, 29 move freely in the slots 30, 31 when they make a feeding movement.
The feeder 25 is controlled to have a rectangularly shaped feeding movement, in which the horizontal part of the movement is adjustable. The driving of the feeding mo
REFERENCES:
patent: 3019749 (1962-02-01), Knobloch
patent: 4365569 (1982-12-01), Adams
Hunter H. Hampton
Husqvarna Aktiebolag
Miller Alfred E.
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