DEFAULT WARNING SYSTEM

• US 3,659,279 A
• Filed: 06/27/1969
• Issued: 04/25/1972
• Est. Priority Date: 06/27/1969
• Status: Expired due to Term

• Current Assignee: Dan S. Wise
• Original Assignee: Dan S. Wise
• Inventors: Wise, Dan S.
• Primary Examiner(s): Caldwell, John W.
• Assistant Examiner(s): Slobasky, Michael
• Application Number:
  US04/837,253
• Time in Patent Office: 1,033 Days
• Field of Search: 340/267,309.1 177/80 317/135,141 307/141,141.4,141.8
• US Class Current: 19/145.5
• CPC Class Codes: D01G 13/00 Mixing, e.g. blending, fibres; Mixing non-fibrous materials with fibres

Abstract

Apparatus and method for detecting malfunctions in fiber blending equipment and for sounding a warning after the detection of such a malfunction. In the embodiment disclosed below, which is specifically designed for use with fiber equipment of the type whereby a plurality of adjacently mounted weighing pans receive fiber to be blended and, under the control of appropriate electrical circuitry, weigh and dump it upon a conveyor which periodically moves forward to form fiber sandwiches which are then delivered to other equipment, the failure of the relay which controls the conveyor to be activated after a set time greater than the time that the relay remains deactivated during normal operation causes a horn to give an audible indication of malfunctions.

Claims

1. A fiber blending system comprising:

a plurality of weighing pans for receiving fibers to be blended, conveyor means beneath said weighing pans, means for weighing the fibers in each of said weighing pans and for dumping the fibers in said pans onto said conveyor means when the weight of fibers in each said pan equals a weight chosen for that pan, means for causing said conveyor means to move after each dumping a given distance, including relay means having a first condition causing said conveyor means to move and a second condition not causing said conveyor means to move, switch means electrically connected to said causing means having a first position disabling said causing means and a second position not disabling said causing means, and means electrically connected to said switch means for indicating a malfunction whenever said switch means is in said second position and said conveyor means remains stopped for longer than a chosen time period, including means for detecting when said relay means is in said first condition so that said conveyor is moving said detecting means including second relay means having a first condition when said switch means is in said first position and a second condition when said switch mean is in said second position, third relay means having a first condition when both said first and second relay means are in said first condition and a second condition when both said first and second relay means are not in said first condition, and horn means associated with said third relay means for giving an audible indication when said third relay means remains in said first condition for longer than said chosen time period.

2. A system as in claim 1 wherein said third relay means includes a switch connecting said horn means to a source of electrical energy and means for closing said switch after said third relay means has been in said first condition for said chosen time period.

3. A system as in claim 2 including means to adjust said chosen time period.