Back to results
US 3,957,186 AGranted
Method and apparatus for tearing sections from a web
AssigneeJohnson & Johnson
InventorDonald Babcock
Life of this patent
Estimating the term…
Abstract
A web of fibers is continuously fed between a rotating tearing apparatus where the web is torn into sections without causing compression of the fibers at the tear line. The tearing apparatus is comprised of two opposed rotating pairs of web holding means or jaws which receive and engage the web. To tear the web, the leading jaw of each pair is angularly displaced away from the corresponding trailing jaw and then returned to a juxtaposed position relative to the trailing jaw. Preferably the jaws are provided with arcuate working surfaces which may be tipped with a resilient material to increase jaw life and to improve the holding characteristics thereof for webs of contoured cross section.
Claims12
Apparatus for severing separate sections from a web which is continuously fed therethrough comprising:
- frame means;
- tearing means rotatably mounted in the frame means and including two opposed rotatable pairs of web-engaging, resiliently-mounted members, each pair having a trailing jaw member and a juxtaposed leading jaw member pivotally mounted with respect to the driven jaw member;
- driving means simultaneously rotating said pairs of web engaging members in opposite directions relative to each other so that said opposed, resiliently-mounted members engage said web at about the same time;
- and
- accelerating means shifting said juxtaposed leading jaw members substantially simultaneously away from the respective trailing jaw members and in the general direction of web movement when the trailing jaw members engage the web therebetween while the web-engaging extremities thereof travel at substantially the same linear speed as the web, thereby severing a portion of said web and moving said severed portion away from said web.
2 more elements
An apparatus for severing separate sections from a web comprising:
- frame means;
- tearing means rotatably mounted relative to said frame means and defining a web feed path, said tearing means including two pairs of transversely disposed spaced semi-cylindrical members located in juxtaposition on opposite sides of a web adapted to be fed therebetween and supporting resiliently mounted web holding jaw means, and one member of each pair being a driven member and the other member of said pair being pivotally mounted in said frame means with respect to the driven member;
- means for continuously rotating said pairs of semi-cylindrical members in opposite directions relative to each other;
- means operatively coupling each pair of semi-cylindrical members whereby the members of each pair rotate conjointly and including coupling gear means attached to the pivotally mounted members of each of said pairs and positioned and free running with respect to the driven members of each pair so as to enable each of said pivotally mounted members to rotate together with its respective frame mounted member and to be moved relative thereto during web-severing action;
- the web holding jaw means supported by one pair of semi-cylindrical members being positioned relative to the web holding jaw means of the other pair of semi-cylindrical members whereby, when the pairs of semi-cylindrical members are rotated, the web holding jaw means of each pair are periodically brought into concurrent engagement with said web;
- means biasing the semi-cylindrical members of each pair relative to each other whereby the web holding jaw means in each pair of semi-cylindrical members are placed in juxtaposition;
- and moving means for moving one of the semi-cylindrical members of one pair relative to the other semi-cylindrical member of said one pair substantially simultaneously on both sides of the web during engagement with the web to stress and sever a section of web;
- said moving means being comprised of cam means including drive cam means operatively mounted to rotate with one of the frame mounted semi-cylindrical members of one pair, and driven cam means fixedly positioned relative to the coupling gear means on the pivotally mounted semi-cylindrical member of the other pair whereby the action of said drive cam means is transmitted to each of said pivotally mounted members by said gear means, thereby to simultaneously move one web holding jaw means of each pair relative to the other web holding jaw means of each pair during engagement of the web to stress and sever a section of web.
5 more elements
A method of severing sections of predetermined length from a continuous fibrous web which comprises:
- providing two opposed pairs of spaced, rotatable jaw members,
- continuously feeding the continuous fibrous web between said opposed pairs of jaw members while said jaw members are rotated together in the direction of web feed so that the web-engaging extremities of the jaw members travel at the same linear speed as the web,
- grasping the web between opposed sets of rotating jaw members, and
- substantially simultaneously accelerating the leading set of the rotating opposed web-engaging jaw members relative to the trailing set of the rotating opposed web-engaging jaw members while the web is held between said trailing set of opposed jaw members so as to sever a segment from said web and move the severed segment away from the web.
1 more element
Dependencies are inferred from the claim text.