| 摘要 |
880,309. Setting dress fasteners. UNITEDCARR FASTENER CORPORATION. Oct. 15, 1959 [Oct. 21, 1958], No. 35020/59. Class 43 In a method and apparatus for attaching fastener elements having a base made of a heat sealable synthetic plastic to a support, the method comprises the steps of feeding a strip of connected fastener elements to an attaching tool such that the leading fastener element is engaged by the tool, separating the leading fastener element from the strip, operating the attaching tool to press the fastener element on to a support and actuating means to effect the supply of electrical current to heat seal the plastic base of the fastener element to the support. Strips of connected fasteners 61 pass from reels 3 to members 8. Each member 8 rotates on a pin 33 at the lower end of a plate 26 pivoted at the other end to the end of a rod which reciprocates in an air cylinder 17 connected to an air compressor 18. Each rotary member 8 has a series of bores in each of which slides a fastener holder having a shank which engages either the surface or a groove of a horizontally slidable pin to accommodate either studs or sockets in the bores. Rotation of the member 8 by means of a pivoted pawl 37 feeds a fastener to the applying position and the stretch on the connecting strip between the bores separates the fasteners. A cutter 54 is also provided. The flanges of the fasteners may be heat sealed together by the apparatus. The apparatus is electrically controlled to automatically heat seal a fastener. A main switch, a heat control switch and a tool control switch are initially closed and operate the air compressor and filament circuits of the oscillators of the generators. Work is positioned between the member 8 and lower tool 9 and a switch 16 is closed to operate the air solenoid valve 20 to supply air to the air cylinder 17 to move the member 8 downwardly on to the work. The switch 21 is closed as the air pressure increases to the predetermined amount and a relay of a timer 12 energizes. The switch 16 opens and the timer 12 operates closing the contact 47 and energizing the coil of a mercury relay 50 which closes contacts 51 and supplies current to generator 10 to hold the work between the lower and upper tools and to heat seal the fastener to the work. At the end of the time cycle a second relay opens contact 46 de-energizing relay 50, opening contact 51 and cutting off current to the generator 10. After a time cycle to cool the plastic contact 45 closes, contact 46 opens, energizing timer 48 for a cooling period after which timer 48 then closes contact 49 energizing the coil of solenoid valve 20 to open the air valve. The member 8 rises under the action of springs to release the work. An air pressure switch 21 opens automatically de-energizing the first relay of timer 12 and automatically resets the circuit. As the member 8 rises a pawl 37 engages projecting pin 39 to bring the reset fastener in the member to applying position. The member is held in applying position by a spring pressed plunger 40 contacting the pin. |
