Safety double protection device for machines having plural circuit breaker assemblies associated with doffer roller and hand guard

• US 4,085,303 A
• Filed: 03/08/1976
• Issued: 04/18/1978
• Est. Priority Date: 03/08/1976
• Status: Expired due to Term

• Current Assignee: Katema LLC
• Original Assignee: Ametek Incorporated
• Inventors: Wolverton, Kenneth Harlan, McIntyre, Robert Alfred
• Primary Examiner(s): Scott, James R.
• Application Number:
  US05/664,690
• Time in Patent Office: 771 Days
• Field of Search: 200/61.41, 200/61.42, 200/61.58 R, 200/52 R, 200/47, 200/153 T, 38/1 C, 38/44, 38/68, 192/129 R, 192/129 A, 192/129 B, 192/130, 192/131, 192/133, 192/135
• US Class Current: 200/61.41
• CPC Class Codes: F16P 3/125 Guards for rolls in calendering or other roll machines, e.g. nip guards, finger guards
• CPC Class Codes: H01H 3/16 adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. for a door switch, a limit switch, a floor-levelling switch of a lift

Abstract

A protection device for use on machines which are hand-fed, for protecting the machine operator from accidentally and inadvertently moving his hands inwardly into the entrance opening of the machine for precluding the possibility of injury to the hands or arms. The device provides a plurality of safety devices connected to an electric circuit which feeds the operating motor and the operation of any one of these safety features will stop the machine.

Claims

1. A double protection device for use on a machine into which material is hand fed to shut off the machine when any part of an operator'"'"'s hand passes into the entrance of that machine, the device comprising:

a frame having a material moving belt mounted thereon;

a doffer roll pivotally mounted on said frame to engage material being hand fed into the machine and press that material against said belt, said doffer roll and said belt defining the entrance to the machine;

a first machine shutdown mechanism for shutting off the machine, said first shutdown mechanism including a first safety switch mounted on said frame and operatively connected to said doffer roll to be actuated by pivotal movement of said doffer roll away from said belt beyond a predetermined distance, said predetermined distance corresponding to the movement undergone by said doffer roll away from said belt if an operator'"'"'s fingers are caught between said doffer roll and said belt, said doffer roll thereby exerting pressure against the material being fed into the machine and actuating said first safety switch;

a second machine shutdown mechanism for shutting off the machine, said second shutdown mechanism mounted on said frame and including a safety guard cover pivotally mounted on said frame and located immediately behind said doffer roll in the direction of movement of said belt and to be thereby located closely adjacent said entrance and having a lower portion located just above said belt and a second safety switch mounted on said frame and operatively connected to said guard cover to be actuated by pivotal movement of said guard cover, said guard cover pivotal movement being caused by contact thereof with an operator'"'"'s fingers, said second safety mechanism being in series with said first safety mechanism to back up said first safety mechanism and shut off the machine in the event said first safety mechanism fails to do so thereby providing a double protection system which is located at the entrance to the machine.

2. The protection device of claim 1 further including connecting means connecting said first shutdown mechanism to said second shutdown mechanism in a manner such that movement of said doffer roller beyond a predetermined distance away from said belt actuates said second safety mechanism.

3. A combination as defined in claim 1 in which said cover has a balancing portion extending from said cover is pivotally mounted whereby the weight of said cover is substantially balanced to reduce operating force and whereby engagement of said balanced portion tending to raise said engagement portion of said cover will move said cover into actuated position.