Patent GB-190200786-A (GB)
Title: Machine for Sewing Shank-eyed Buttons
Inventor: MATHISON JOSEPH
Filed: 1902-01-10
Granted: 1902-03-06
Abstract: 786. Mathison, J. Jan. 10. Button - attaching machines; feed.-Relates to machines for sewing g shank buttons, and of the class in which a loop of thread is drawn through the material and through the button eye, while a second loop, drawn through the first outside the eye, is passed over the button. The slot 78, Figs. 6 and 20, of the button-shoot 6, Fig. 13, down which the buttons slide with their shanks projecting upward through the slot, terminates in a horizontal part 9 on which the shank of the button to be sewn is held by a clamp 19. The hooked needle 39 then descends through the eye and draws up a loop 136, Fig. 25, which is deflected by an arm 77, so that the needle, on its next descent outside the button eye, passes through the first loop and brings back a second loop, round which the first loop is tightened. This second loop 137, Fig. 20, is then engaged in succession by the hooks 88, 89, of a spreader 86 which opens it to a triangular shape. The clamp 19 is now raised, the button turned up out of the shoot by an ejector 11, Fig. 13, and the loop 137, being released from the spreader 86, and from the needle by the cast-off 99 into the eye of which the needle had previously entered, is dropped round the button and tightened round the shank by the take-up, Fig. 31<a>. The complete tightening of the loops is effected by lifting the button eye. This is effected by a swinging finger 120, Fig. 6. which tilts the button, and also serves to feed forward the work into position to receive the next button. This tilting of the button causes the loop 137 to slip off the shank and tighten on the loop 136, as shown in Fig. 33<a>, the shank then setting itself across the line of stitching. The finger 120 is operated through an adjustable link-and-slot connection. the slot being so. arranged that the finger 120 always starts from the same initial position whatever the adjustment. The clamp 19 is carried on a lever pivoted at 20, Fig. 13, and operated from a lever 22, and the ejector 11 is carried on a lever 12 pivoted at 13 and operated from a lever 15. Governing needle thread.-Between the tension and the looper 67, the thread passes through a thread controller, Fig. 7, consisting of a drum 105 having a diametral hole 107, and a fixed thread eye 108 vertically above it. The thread passes through the hole 107, and the drum is oscillated so as to pull off the thread required, take up the loop 136, give out thread for, and take up, the loop 137, and finally lock the thread while the tightening of the loops is completed. The drum 105 is operated by a rack segment and cam-actuated rock-shaft. Presser lifted automatically.-The presser-foot 28, Fig. 6, which is arranged below the work and work-support 26, Fig. 20, is normally pressed against the work by a spring and is locked and taken off the work by the cam surfaces of a slotted rack-bar, Fig. 17, engaging a stud on the presser-bar 29. Needle-bars, vibrating laterally needle-driving.- The needle-bar slides in a pivoted frame which is oscillated by means of a cam, so that the needle makes one stitch through the button eye and the next to one side thereof, as described above. The needle-bar is driven by an arm projecting from a rock-shaft, the end of the arm engaging the needle-bar being slotted to allow of the movement of the needle-bar frame. Needles, hook, cast-off devices for.-Two cast-off devices are provided, one 61, Fig. 13, for casting off the first loop 136, the other 99, for the second loop 137.