763 



thread and draw up the shuttle-thread through the hole in the plate. Place the 

 cloth under the ^nover, and the machine is ready for work. The proper time for 

 turning the work to sew a corner, &c., is when the spring at the top is lifted off. 



1760 



7. The length of stitch is regulated by the screw E at back of machine. 



8. The tightness of the needle-thread is regulated by the screw F. 



9. The tightness of the shuttle-thread is regulated by passing the thread through 

 more or less holes. 



1 1 . The quantity of thread pulled off the reel for each stitch is regulated by the 

 position of the piece of brass B. The lower the hole at its end, the greater the quan- 

 tity pulled off: when the cloth is thick, more thread is used, and the end of the brass 

 B should be lowered ; when thin, raised. It should be in such a position that the 

 trumpet c is drawn nearly down to the pin on the slide when the shuttle passes 

 through the loop. 



A patent was obtained by John Thomas Jones, of Glasgow, in February 1859, for 

 a sewing machine presenting many novelties and improvements. Mr. Jones's patent 

 well explains his machine ; we therefore transfer his description to our pages. 



The machine consists, under one modification, of an open frame, having a platform 

 top upon which the sewing or stitching operations are carried on. Beneath this plat- 

 form, and near one end of it, is a short transverse horizontal first-motion shaft running 

 in bearings in the framing, and carrying a long crank, a connecting rod from which is 

 jointed at its opposite end, directly the shuttle-driver or slide-piece, working in a 

 horizontal guide recess beneath the opposite or front end of the platform or table. 

 The first-motion shaft has also another and shorter crank upon it, the stud-pin of which 

 is connected to the pin of the longer crank by an overhanging link piece, provision 

 being made for the adjustment of the relative positions of the two cranks as regards 

 their sequence of revolution. It is this shorter crank which actuates the needle move- 

 ment, the pin being entered into a differentially slotted or operated cam piece, forming 

 the pendent lower end of a bent lever, working on a stud-centre, in the interior of the 

 overhead bracket or pillar arm of the framing. The centre on which this lever works 

 is in the horizontal part of the overhead bracket arm, and its opposite or free-working 

 end h.as a rectangular slot hi it to embrace a rectangular block of metal working 

 freely upon a lateral centre-stud upon the vertical needle-carrying bar. In this way 

 the needle has imparted to it a differential reciprocatory vertical movement, the 

 peculiar connection of the needle bar with the actuating lever having the effect of 

 marking the needle in the most accurate manner, and preventing jarring and wear. 

 These are the whole of the primary movements for working the stitches, which may 

 be of various kinds, as made up from the combined action of the needle and shuttle, 

 or thread-carrier ; the form of the slotted piece or operated cam in the end of the 

 needle lever, being variable to suit any required peculiarity of needle movement, the 

 main elements of which are a direct up-and-down motion without a stop or rest, until 

 at the termination of the down stroke, when a short rise takes place, succeeded by a 

 rest to allow of the due looping and stitching of the thread. The feed of the fabric to 

 be sewed is effected by the operation of a short vertical lever piece with a cranked 



