US2056670A - Sewing machine - Google Patents

Description

Oct. 6, 1.936. I J. GOYULDBOURN ET AL 2,055,670

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J. GOULDBOURN ET AL SEWING MACHINE.

Filed Sept. '7, 1933 19 Sheets-Sheet 1'7 7 Oct. 6, 1936. J 'GQULDBQQRN ETAL I 1 2,056,670

SEWING MACHINE Filed Sepi. 7, 1955 19 Sheets-Sheet i8 Patented Oct. 6, 1936 omen "STATES PATENT OFFICE SEWING MACHINE Application September 7, 1933, Serial No. 688,480 In Great Britain October 11, 1932 31 Claims. (Cl. 112-38) This invention is concerned with improvements in or relating to sewing machines including starting and stopping mechanisms particularly applicable thereto and is particularly but by no 5 means exclusively concerned with sewing ma-- chines (and stop motions therefor) for operating on thick stubborn materials such as leather.

In the boot and shoe industry, for example, machines are used for sewing the outsoles of i welted shoes (which term is used herein as including also boots) to their welts by .a lockstitch seam and such machines make use of a curved hooked needle, a rotary shuttle, a looper, thread lock and thread lifter to cooperate in 15 handling thread to form the stitches in a manner well known.

An illustrative machine of this kind is disclosed in United States Patent No. 1,169,909 granted to Fred Ashworth, February 1, 1916.

o Usual machines of this kind employ mecha nism for actuating the sewing instrumentalities which, while satisfactory for enabling the machine to sew efllciently, up to a speed of say five hundred stitches per minute or thereabouts, is 5 not suited for enabling the machine to run at a relatively high speed for example to sew a thousand stitches per minute. For instance, the actuating mechanism for the sewing instrumentalities in machines of the type aforementioned 30- comprises two relatively long and horizontal cam shafts arranged (one above and behind the other) transversely across the head of the machine near its top and carrying relatively heavy cams which actuate the various sewing instrumentalities 35 through jointed and relatively heavy mechanisms some of which extend across the machine for considerable distances. The arrangement 'of the cam-shafts in the said position and the use of somewhat heavy mechanisms for actuating the 40 sewing instrumentalities results in the setting up of vibration in the machine which becomes excessive if it is attemptedto run the machine at high speeds and makes the smooth continuity of the sewing operation difiicult if not impossible to secure and also tends to render the formation of the individual stitches less accurate.

One of the several objects of the present invention is to provide a novel form of sewing machine 50 of the kind referred to in which actuating mecha-nism for the sewing instrumentalities is so arranged in the machine that the tendency for vibration to be set up in the machine when it is running at a high speed will at least be markedly 55 less acute than were any such speed to be attempted with such known mechanism as just referred to.

In an illustrative embodiment of the present invention hereinafter described the various sewing instrumentalities are actuated. by a number 6 of cams and cranks which, instead of being secured to horizontal shafts which extend across near the top of the machine, are arrangedpn a number of shafts extending in a plurality of directions and which consequently can be and are 10 grouped closely adjacent the point in the machine at which the sewing takes place; This arrangement assists the actuating mechanism as a whole to run at high speeds without excessive vibration and also, since the shafts are grouped relatively close to the sewing point, enables the connections between the various cams and the sewing instrumentalities to be relatively short and light, thus also tending to minimize the vibration. Moreover the particular heightwise disposition (herego v inafter disclosed) in the said illustrative embodiment of the said shafts relatively to the point at which the sewing takes place is such that the shafts are disposed mainly below .the sewing point thus not only producing a machine which has a low centre of gravity (and therefore runs more steadily) but also enabling the progress of the sewing operation to be more easily watched by permitting an abundance of light to come from different directions to the sewing point.

In arranging a sewing machine to run at a high speed it is important that both the individual speeds of movement of the sewing instrumentalities in relation to the machine cycle and their relative timing be settled with a high order of accuracy so that the absolute time taken by the various instrumentalities in carrying out their individual functions maybe made as small as is consistent with smoothness of operation and inv order that they may cooperate one with another in complete harmony. It is particularly important that in sewing machines of the kind previously referred to the needle and awl should be actuated in a manner which, while allowing them to remain inoperative during certain periods of 4.5 the machine cycle, will nevertheless cause them to move smoothly and with rapidity at other times and this imposes special conditions as indicated when a machine of this kind is to be run at very high speeds' v Accordingly it is another object of the present invention to provide novel mechanism, in a machine of the kind hereinafter referred to, for actuating a needle and awl in this manner. In the illustrative embodiment of the invention 56

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