Patent GB-624352-A (GB)
Title: Improvements relating to machines for inserting and fixing eyelets, rivets or the like
IPC: A43D100/02
Filed: 1946-07-10
Abstract: 624,352. Eyeleting. EVANS CONCINNUM, Ltd., and HUDSON, F. N. A. July 10, 1946, No. 17914/47. Divided out of 614,342. [Class 43] In an eyeleting machine of the type comprising a vertically reciprocable plunger for receiving the eyelets, a co-operating die, located below the work, a pivotally mounted eyelet-storing and delivery head, and mechanism which relates the movements of the plunger and head so that when the former is operated the delivery part of the head is automatically advanced and withdrawn as required, the said head turns about an axis at right angles to the line of stroke of the plunger, an oscillatable plunger-operating lever being provided, having a lost-motion connection with the head, which connection causes or permits the required turning movements of the head when the lever is operated. An adjustable die 3 co-operates with a plunger 9, carrying at its lower end a punch 10 and being linked at its upper end to one end of a plunger-operating lever 13, which pivots on a horizontal pin 14 and is turnable in a fork 15 formed at the top of the frame 1; the plunger 9 is normally held away from the die 3 by a spring 16. A turnable head 4 includes a runway comprising two guides 6 and a base plate 5 which is pivoted on a horizontal pin 7 fixed to the frame 1. The upper part of the runway is parallel to the frame, while the lower part curves inwards and ends horizontally, the guides 6 being on the outside of the curve. A storage box 17, having spaced discharge slots for the eyelets, is mounted near the top of'the head on a rotatable shaft carried by the base plate 5; the other side of the shaft carries a ratchet wheel constantly engaged by a spring-urged pawl pivoted to the frame 1, so that turning movements of the head 4 cause rotation of the shaft and hence delivery of supply of eyelets to the runway. An arm 22 fixed on the pivot 14 of the plunger-operating lever 13 has a transverse pin 23 which engages in a slot in one end of a link 24, the other end of which is pivoted on a pin 25 fixed to the base plate 5. Initially the lower end of the runway, which communicates with a flared eyelet discharge slot, is under the punch 10; a spring-urged plunger normally prevents the entry of an eyelet into the slot. When the plunger-operating lever 13 is operated, the punch 10 engages the lowermost eyelet in the runway, and simultaneously the pin 23 travels forward taking up the lost motion provided by the slot in the link 24; when the pin engages the end of this slot the link 24 is operated causing the head 4 to pivot so that the lower end of the runway swings towards the frame 1, the tip of the punch 10 and eyelet thereon being disengaged through the discharge slot against the pressure of the above-mentioned spring-urged plunger. Continued operation of the lever 13 forces the punch and eyelet through the material, and the eyelet is clenched against the die 3. On the return movement of the lever 13 the head 4 is swung back to its original position by a spring (not shown). In a modification for inserting rivets, the rivets are fed singly and head uppermost from the bottom of the runway into a pocket comprising two similar parts. A collar is slidably mounted on the plunger 9 above the punch 10, and has a' vertical slot engaged by a pin on the plunger 9, each half of the pocket being carried at the lower end of a flat spring, the upper end of which is attached to the sliding collar, so that said halves normally lie close together. In operation the plunger 9 moves downwards, and the pocket contacts the workpiece, after which the pin on the plunger slides in the slot in the sliding collar and the punch engages the head of a rivet in the pocket, the two halves of which are forced apart against their springs ; the rivet is then forced through the work and clenched. On the return movement of the plunger 9 the pocket remains on the work until the pin on the plunger engages the top of the slot in the collar, after which the collar and pocket are returned to their normal positions.