Patent GB-615206-A (GB)
Title: Improvements in and relating to mechanism for forming sliders for slide fasteners
IPC: B21D53/54
Filed: 1944-09-15
Abstract: 615,206. Making sliding-clasp fasteners. LAWSON, B. P. Sept. 15, 1944, No. 17672. [Classes 83 (ii) and 83 (iv)] [Also in Groups XXV and XXX] Angular bending.-A machine for deforming the neck of a slider for a sliding-clasp fastener, so as to give it a V-form in section for greater strength, comprises means for feeding sliders on to a table actuated to carry them one at a time to a position beneath a male die which descends into co-operation with a female die arranged beneath the table, carrying the slider with it; the head carrying the male die also carries parts which are automatically moved laterally into engagement with the slider to provide additional support. The machine described is a power-press with a verticallymoving ram 34 and a horizontally-reciprocating table 37 for carrying the sliders s one at a time from a shoot 38 to the operating position, both these members being actuated from the same shaft. The table 37 is formed in two parts, providing between them a slot for the slider; these parts move together for most of their stroke, but the actuating mechanism is arranged so that the slot is closed slightly during travel to the operating position so as to ensure that the slider will not be too thick to enter the die. The die 67, which is carried in a recess in the table-support 36, has a tongue 68 projecting upwards within its aperture to receive the slider s and is slotted to receive a sliding member 89 which moves forward to engage the slider after the lug l of the latter has passed beneath it; the movements of the member 89 are produced by cam surfaces on a member 86 carried by the ram 34 engaging cam surfaces on a block 88 sliding in the recess in table 36. The ram 34 carries a head 74, movable upwards relatively to the ram against springs and guided by depending arms 72 carried by the ram. The head 74 carries horizontally sliding members 78, pressed apart by a spring, with inclined surfaces complementary to the punch 39, and these members have narrow extensions 78a which support the slider neck, and hold down its wings, as shown in Fig. 17, for the deforming operation; it also has two pins 79, with cut-away portions providing corners to engage notches in the members 78, actuated by spring-pressed arms 80 engaging adjustable stops 81 on fixed pillars. When the ram descends, the members 78 are stopped by the table 37 before the descent is complete, and further movement of the ram forces these members towards each other by means of cam surfaces on the arms 72 to complete the support of the slider before the punch 39 deforms its neck; the members 78 are locked in this position by the pins 79, the arms 80 being clear of the stops 81, and the slider is lifted with the ram until the arms 80 engage the stops again, the slider then being knocked into the receptacle 92 by a pin 91 on the latter. In the arrangement shown, the sliders drop by gravity from the shoot 38 into the slot in the table 37; in a modification, Figs. 19 and 20 (not shown) (see Group XXX), the ram engages plungers actuating a pair of spring-pressed levers which operate in alternation to feed a slider downward past a spring-pressed detector and to press it into the slot respectively.