| 摘要 |
1,112,630. Sliding clasp fasteners. OPTIHOLDING A.G. 30 July, 1965 [6 April, 1965], No. 32826/65. Heading E2S. A method of producing and applying end stops to uncut lengths of interlocked fastener strips i.e. tapes with fastening elements, wherein pieces 8a of thermoplastic film each oomprising the top stop for one fastener and a bottom stop for the next fastener in the length of interlocked strips, are welded by pressure and heat at positions along the said strips, comprises the steps of conveying a strip of thermoplastic film in the longitudinal direction of the length of the interlocked fastener strips to an end stop producing and applying station and at said station, for each position, cutting a said piece of film from the film strip and applying it and bonding it to the interlocked fastener strips, the cutting, applying and bonding steps being effected in one working operation. A machine is described for carrying out the method which comprises a welding tool having a male portion 1 and a female portion 2, a device for feeding the interlocked strips between the female portion and the male portion and a guide 11 extending in the direction of the length of said interlocked strips for conveying the strip 8 of thermoplastic film to a cutting nip constituted by the male portion of the welding tool and an edge of the guide 11, a downward stroke of said male portion serving to cut a said piece 8a of the said thermoplastic film extending from the guide therefore and to bond it to the interlocked fastener strips. The thermoplastic film is driven towards the welding tool by rollers 3, 4 and prior to entering the guide 11 slots having a transverse portion 9 and a longitudinal portion 15 are stamped out of the thermoplastic film by a punch 5, the punch 5 the male portion 1 of the welding tool and the rollers 3, 4 being synchronised so that the transverse portion 9 of each slot is so positioned that the male portion 1 only has to cut through narrow pieces of the film on each side of the transverse slot. The longitudinal portion of each slot forms a notch in the leading edge of the film so that when the next piece of film is welded to the interlocked strips it prevents the fastener elements underneath the notch being welded together, these being the fastener elements which are the elements adjacent the top stops of the finished fastener. After each piece of thermoplastic film has been welded into place the interlocked strips are advanced a distance corresponding to the length of the finished fastener before the next piece of film is welded into place. In addition to forming the top and bottom stops the welding tool also forms a slot 16 through the piece of thermoplastic film and the interlocked strips. The length of the piece of thermoplastic film can be of any desired extent. Reference has been directed by the Comptroller 900, 183. |
