Patent GB-326830-A (GB)
Title: Improvements in or relating to the feeding or delivery of blanks of sheet material
IPC: A43D111/00
Filed: 1928-11-21
Abstract: 326,830. British United Shoe Machinery Co., Ltd., Woodcock, R. B., and Kestell, T. A. Nov. 21, 1928. Sheet-separators; pile supports for sheet-feeds; pusherfeeds for single sheets.-Suction feeding mechanism is employed for feeding blanks to be used for toe stiffeners from a magazine to members of a machine which engage their opposite faces, the blanks being treated by a material which softens them as described in Specification 236,600, [Class 17 (ii), Boots and shoes, Construction of]. The blanks may be cut from the material set forth in Specification 210,168, [Class 17 (ii), Boots and shoes, Construction of], and may be treated with rubber latex or celluloid solution as set forth in Specification 277,719, [Class 17 (ii), Boots and shoes, Construction of]. The feed mechanism comprises a reciprocating suction device 12 which is reciprocated in a bed plate 10 by lever-andlink mechanism 40, 41, from a compound cam disc 44. The cam disc 44 also operates, by adjustable lever-and-link mechanism 42, 57, a slide 56 fitted with a bar 54 which supports feed fingers 59 adapted to be reciprocated above fixed bars 55 and controlled by detent mechanism so as to be lowered on to the blank as the slide 56 moves to the right. When the fingers 59 have moved the blank to the desired position relatively to the machine which is to operate on the same, they are raised and held in raised position by the detent mechanism as the slide returns. The detent mechanism is operated by adjustable stops 68, 70, and comprises a lever 60 fixed on the bar 54 and a lever 62 pivoted to the slide 56, the levers being connected by a spring 63. The lever 60 is fitted with an interior right-angled corner piece 64, and the lever 62 with an exterior right angled piece 66, and during the return of the slide 56 the pieces 66, 64 engage and keep the fingers raised. The stop 70 causes the corner piece 66 to be depressed under the lower end of lever 60, and the spring 63 then depresses the fingers on to the blank The blanks are fed from a magazine formed of adjustable side members 16, and a front member 14 fitted with an adjustable gate 22. The blanks are pressed downwardly by projections 74 on a block 72 universally pivoted to a bar 76 guided by a pivoted bracket 78 which can be swung aside to permit insertion of the blanks. The air pressure in the suction device 12 is controlled by a slide valve 46, Fig. 6, raised by a spring 48 and depressed by a cam 45 acting on a roller. A pipe 49 is connected to the nozzle 12, and the air which is withdrawn passes through a filter 51 before reaching the pipe 50 leading to a continuously driven pump. When several feed members are operated from a common pump, a safety valve mav be used in connection with each nozzle 12 to prevent impairing of the suction action in the remainder of the nozzles due to the absence of a blank from one nozzle. If a blank is missing, the abnormal flow of air is adapted to cause a ball 82, which normally rests on a screw 88, to close an orifice 86 which in the open position of the valve 46 connects with the pipe 50. The shaft 33 of the cam disc 44 is driven from a shaft 34 by an adjustable connection consisting of an arm 37 connected to one of a series of holes 38 on a disc 35 on the shaft 33, and so the timing of the feed mechanism relatively to the operating machine can be controlled. The adjustment may be controlled by the aid of a graduated scale. Specification 297,010, [Class 17 (i), Boots and shoes, Apparatus for making &c.], also is referred to.