| 摘要 |
<p>1,021,566. Making perforated metal strip; punching; corrugating. ROHR CORPORATION. March 6, 1964 [Dec. 11, 1963], No. 9715/64. Headings B3A, B3E and B3W. A metallic ribbon 27 is perforated by needles 67, the tip portions of which are impaled within small rubber ribbon stripping cylinders 72, adjacent needles being staggered, the two rows thus formed being spaced apart by shims 74. An upper back-up plate assembly co-operates with the assembly 51 and comprises a metal bar 54 and a resilient ribbon stripper 58 attached thereto. The needle forms protuberances 56, the material of which doubles back on itself with progressive penetration due to the needle taper (Fig. 12, not shown). Simultaneously with the piercing process the ribbon is first yieldably clamped between the die members 25. The lower spring 38 is stiffer than the upper spring so that on further movement of the die member 23 the sidewall of a new corrugation is formed between tooth 24 of die 20 and a tooth 26 of die 19 when the upper member 25 bottoms on support 11. The remainder of the corrugation is formed between the upper and lower teeth 26 when the lower member 25 bottoms on support 10 (Fig. 1, not shown). The corrugations are stretched by a controlled amount by members 47, 48, to give the required spacing between corrugations and to compensate for any tapering of the corrugations over the width of the ribbon. The member 48 is adjustable at either or both ends relative to the support 11.</p> |
