GB1045354A - Machine for forming and applying box clip - Google Patents

Abstract

1,045,354. Punching. NO NAIL BOXES Ltd. May 26, 1965 [Feb. 26, 1964], No. 8073/64. Heading B3W. [Also in Divisions B4, B8 and F2] A machine for forming clips from a metal strip and for attaching them to the adjoining marginal portions of boards assembled edgeto-edge to form a foldable box blank (see Division B8), comprises a feeding means for advancing the strip intermittently and a press adapted during each pause of the strip to form teeth in an end portion of the strip and then sever and trim such portion into a boxclip, the latter then being pressed so as to force the teeth through the marginal portion of the boards and clench them over on the opposite side of the boards. The machine comprises main transverse supports 24, 25 on which are slidably mounted a pair of frames 81 each carrying a punch assembly 51 and a stripfeed assembly 52; the spacing between each combined assembly may be adjusted by means of rack-andpinion devices 43, 45, Fig. 7 (not shown). The punch assembly includes a number of punches 77, Fig. 6, for piercing the strip in order to form prongs 215 on the box-clip and a punch 76 for severing and trimming the clip and for driving it into the respective board. The punches are mounted in a holder 73 which is carried by a slide 65, the latter being raised and lowered by an eccentric 61 keyed to a shaft 35. The strip feed assembly includes a pivoted gripper 119 and an anvil 127, both parts being mounted on a slide 120 which is reciprocable on guide rails 123. The gripper is urged into contact with the strip by means of an adjustable screw 149 carried by a slide 129 which is reciprocated by means of a lever mechanism 138, 142, 144 and 146 the lever 144 being rocked by means of an eccentric 135 rotated by a shaft 27. The prongs 215 are clinched over, after being driven through the board, by means of blocks 55, 56 secured to a joist 26 movable up-and-down in slides 112 by means of connections 95, 96 actuated by eccentrics which are keyed to the shaft 35. In operation with a strip 116 of metal already in position as shown in Fig. 6, a pair of boards is placed with their edges to be joined centrally over the punch 76 and by operating a switch the shaft 35 is clutched to a fly-wheel 34 rotated by an electric motor. The slide 65 is then driven upward so as to cause the punch 76 to sever the end clip from the strip and drive it through the boards, the punches 77 simultaneously piercing the strip to form the prongs of the next clip. The clinching blocks are brought into contact with the boards just prior to the prongs passing through the latter so that the prongs are clinched over. After the shaft 35 has nearly completed one revolution, an abutment thereon engages with a pawl which through a linkage (see Division F2) engage a clutch on the shaft 27 so that the feed assembly moves the strip forward in readiness for the next punching operation.