| 摘要 |
<p>A double bucket die cutting assembly is provided which is particularly adaped to be installed at the die cutting station of a press for purposes primarily of accomplishing a punching operation thereat upon a moving web of material passing thereby. The double bucket die cutting assembly includes a frame structure in which a pair of buckets are mounted for eccentric rotation about a drive axis in suitably spaced relation relative to each other whereby to permit the material, upon which it is desired to perform a punching operation, to be passed therebetween. One of the buckets is provided with punch means suitably supported thereon so as to lie in a common plane extending the length of the major axis thereof. The other of the buckets is provided with receiving means operable to permit the punch means to be received therein as the punch means is brought into juxtaposed relation therewith during the rotation of the pair of buckets. The frame structure further includes counterbalancing means comprising a pair of weighted rollers which are supported in the frame structure for rotation relative thereto. Each of the rollers is provided with an irregular distribution of the weight thereof about its axis of rotation so that the heavy portion of the weighted rollers will be disposed to the opposite side of the center line from the buckets thereby providing a counterbalancing force to the weight of the buckets during the rotation of the latter. Alignment means are provided cooperatively associated with each of the pair of buckets so as to ensure that proper alignment between the pair of buckets is maintained during the rotation thereof. The frame structure also serves as a support for a drive means which is operable to drive each of the pair of buckets and each of the pair of weighted rollers so that they rotate in a predetermined fashion whereby to ensure that the pair of weighted rollers accomplish their intended counterbalancing function relative to the pair of buckets.</p> |
