| 摘要 |
874,111. Sewing machines. PFAFF A. G., G. M. July 28, 1958 [July 31, 1957]. No. 24156/58. Class 112 [Also in Group XXX]. In a button sewing machine buttons delivered by feed means are pushed in succession into button-receiving means mounted on a rotatable disc, feeler means are then moved into engagement with the button, the disc is rotated to engage the feeler means with the holes in the button and to align the button-receiving means with a button clamp, and the feeler means are moved to transfer the button to the clamp for the sewing-on operation. A channel-shaped frame having upright sides 10, 11 and a horizontal base 38 is mounted by means of a pin 132 on a plate 133 carried by the work-supporting arm 134 of the machine. A disc 1 is journalled, by means of a pin projecting from its undersurface, in a bush 49 near the forward edge of base 38. Mounted on the upper surface of disc 1 is a C-shaped leaf spring 6 enclosed within a C-shaped ridge 4 and attached thereto by a block situated opposite the opening in the spring. A notch 3 in the periphery of disc 1 enters said opening. Disc 1 lies in an aperture 51 formed in a plate 40 supported on lugs 39 on base 38, disc 1 and plate 40 thus being at the same height. Mounted on plate 40 are plates 41, 42 spaced apart by at least the width of a button, and on plates 41, 42 are mounted plates 43, 44, all said plates being secured to the lugs 39 by screws passing through aligned sets of holes 45, 46, 47, 48. A frame 25 is journalled at its rear end on pins 14 in apertures 13 in sides 10, 11, and carries at its front end a button clamp having jaws 28, 29 which are disposed adjacent the front edge 27 of base 38 and are formed with button-receiving grooves 37. Frame 25 is connected to the machine presser bar to rise therewith. Jaws 28, 29 are pivoted to frame 25 at 30, 34 respectively, are biased together by a spring 32, and are interconnected by a bar 35 pivoted thereto at 33, 31 respectively, whereby the jaws move together or apart in unison. A screw 36 on bar 35 engages an adjustable abutment to limit outward movement of the jaws. A shaft 17 journalled in bushes 15 in sides 10, 11 carries between the latter cams 60 to 63 and externally of side 10 a disc 64. Disposed in apertures 18 in sides 10, 11 is a shaft 19 to which is pivoted, by means of bores 82 to 85, cam follower levers 78 to 81 which extend through the frame 25 and carry rollers 86 to 89 engaging cams 60 to 63 respectively. A shaft 21 journalled in apertures 20 in sides 10, 11 carries externally of side 10 a handle 77 and an arm 73 which is biased by a spring 74 to engage a pin 75 on side 10. The bent end 76 of arm 73 is thereby positioned adjacent the rim of disc 64 and engages the bent outer end 68 of an arm 66 pivoted in an aperture 65 in disc 64 and biased anti-clockwise by a spring 67. If handle 77 is momentarily depressed to swing arm 73, end 68 is released to engage the rim of disc 64 and the inner end 71 of arm 66 shifts into the path of movement of pins 70 carried by a continuously rotating disc 69 mounted concentrically with disc 64. A pin 70 thereby engages end 71 to drive shaft 17, which is stopped at the end of one revolution by the re-engagement of ends 68, 76. A bar 53, connected by a swinging link 55 to a pin 56 upstanding from base 38 passes under the plate 40 and carries at its forward end a pin 54 engaged in the slot 3 in disc 1. A pin 59 on the rear end of bar 53 passes through a slot 57 in a fixed plate 58 and engages a recess 90 in lever 78. During a revolution of shaft 17 disc 1 will thereby oscillate through 180 degrees. A bar 91, pivoted to lever 79, rests on plate 40, is provided at its front end with a button-pushing member 94, and is formed on its upper edge with a cam 106. A bar 92, pivoted to lever 80, is formed at its front end with a boss 95 from which project downwardly pins 96 spaced to engage the holes in a button, and from which projects forwardly a nose 130. A bar 93 connects lever 81 to one arm of a lever 97 pivoted on a pin 100 fixed in an aperture 99 in side 11. The other arm of lever 97 carries a pin 98 which is disposed under bar 92 and serves to raise the latter on rotation of shaft 17. A shaft 23, engaged in apertures 22 in sides 10, 11, has journalled thereon an arm 102 carrying a roller 101 engaging the upper edge of bar 92. Also journalled on shaft 22 is an arm 104 which is rigid with an arm 105 and carries a roller 103 engaging the upper edge of bar 91. Springs 107, 108 are connected between pins 111, 112 on levers 78, 79 and arms 104, 105, a spring 109 is connected between a pin 113 on lever 80 and a lug 115 on arm 102, and a spring 110 is connected between a pin 114 on lever 81 and shaft 23, whereby the rollers 86 to 89 are pressed against cams 60 to 63, and rollers 101 and 103 are pressed against bars 92 and 91. The lower end of a button shoot 119 passes through a notch 116 in side 10 and is connected to a guide member 118 on plate 43. A block 121, carried by shoot 119, journals a pin 122 to one side of which is fixed arms 123, 124 and to the other side is fixed an arm 125 which is located above the arm 105. A spring biases pin 122 clockwise to engage arm 123 normally with the base 126 of chute 119 for retaining a succession of buttons above arm 123. During the forward stroke of bar 91, roller 103 co-operates with cam 106 to raise bar 105, and the latter thereby turns bar 125 anti-clockwise to depress arm 123 and raise arm 124 to engage base 126. The button previously abutting arm 123 slides into engagement with arm 124. During the rearward stroke of bar 91, arm 125 is freed and arm 123 re-engages base 126, and the button thereby released by arm 124 slides down the shoot and is deposited on plate 40 in the rear of disc 1. At the beginning of an operation, before the single revolution of shaft 17 is induced by a momentary depression of handle 77, a button lies on disc 1, within spring 6, the opening in the latter is disposed rearwardly, and the pins 96 are disposed above said button and slightly in advance of the centre thereof. When shaft 17 commences to rotate, bar 91 moves rearwardly till element 94 thereon lies between the inner edges 128, 129 of plates 41, 42, and a button is deposited on plate 40 in front of element 94. Bar 92 moves rearwardly to position pins 96 over the centre of disc 1 and then descends to bring pins 96 into contact with the button thereon. Bar 53 then moves forwardly to turn disc I, when pins 96 enter the holes in the button and the opening in spring 6 finally faces the jaws 28, 29 of the button clamp. Bar 92 then moves forwardly, whereby nose 130 ejects the previously sewn-on button from the jaws and pins 96 transfer the button from disc 1 to the jaws. Bar 92 then rises and moves rearwardly to its original position and bar 53 also moves rearwardly to turn the opening in spring 6 to its rearwardly facing position. Finally bar 91 moves forwardly to push the button from plate 40 on to disc 1 and partly withdraws before shaft 17 is stopped by the re-engagement of ends 68 and 76. |
