Sheet feeder for handling sheets of varying thickness

• US 6,402,135 B1
• Filed: 08/27/1999
• Issued: 06/11/2002
• Est. Priority Date: 08/27/1999
• Status: Expired due to Term

• Current Assignee: DMT Solutions Global Corporation
• Original Assignee: Todd C. Werner
• Inventors: Werner, Todd C.
• Primary Examiner(s): Ellis, Christopher P.
• Assistant Examiner(s): Crawford, Gene O.
• Application Number:
  US09/385,500
• Time in Patent Office: 1,019 Days
• Field of Search: 271/35, 271/38, 271/111, 271/117, 271/121, 271/131, 271/137, 271/124
• US Class Current: 271/35
• CPC Class Codes: B65H 2220/01 indicating an entity as a function of which control, adjustment or change is performed, i.e. input
• CPC Class Codes: B65H 2220/04 for distinguishing adjusting from controlling, i.e. manual adjustments
• CPC Class Codes: B65H 2301/42322 from bottom of the pile
• CPC Class Codes: B65H 2404/11 Details of cross-section or profile
• CPC Class Codes: B65H 2404/61 Longitudinally-extending strips, tubes, plates, or wires
• CPC Class Codes: B65H 2511/13 Thickness
• CPC Class Codes: B65H 2601/422 Versatility
• CPC Class Codes: B65H 3/042 separating from the bottom of the pile
• CPC Class Codes: B65H 3/5238 Retainers of the pad-type, e.g. friction pads
• CPC Class Codes: B65H 3/5284 Retainers of the roller type, e.g. rollers
• CPC Class Codes: B65H 3/68 immovable in operation

Abstract

A high-speed sheet feeder includes a separator wheel having a diameter of about three inches. A curved metal shroud having a low friction surface is disposed in close proximity to the wheel. The shroud has first and second straight parts that are disposed about ninety degrees relative to one another, and a curved part that interconnects the straight parts. The curvature substantially conforms to the curvature of the separator wheel. The second straight part of the shroud is parallel to a conveyor belt and has a slot formed in it so that the separator wheel engages sheets below the second straight part. The large diameter of the separator wheel, which is about double the diameter of prior art separator wheels, and the unique shape and extent of the shroud combine to enable a sheet feeder to handle sheets of widely varying thickness.

Claims

1. A sheet feeder for handling articles of differing thickness that ranges between the thickness of a sheet of paper to a thickness of approximately one-quarter inch, comprising:

a bin means for holding a plurality of articles in a substantially vertical array;

a conveyor belt means positioned adjacent a lowermost end of said bin means for removing a lowermost article from said bin means and dispensing it from said sheet feeder;

a separator wheel having a circular configuration positioned in predetermined spaced relation to said conveyor belt means;

said separator wheel having a diameter of about three inches so that articles ranging in thickness from as thin as a sheet of paper to as thick as about one-quarter inch are staggered when disposed against said shroud member;

a shroud member mounted adjacent said separator wheel between said separator wheel and said articles;

said shroud member having a first straight part, a curved part that substantially conforms to a contour of said separator wheel and that has a radius of curvature of about one and one-half inches so that articles ranging in thickness from as thin as a sheet of paper to as thick as about one-quarter inch are staggered when disposed against said shroud member and a second straight part disposed in parallel, predetermined spaced apart relation to said conveyor belt means;

a slot formed in said second straight section of said shroud member so that articles in said bin area are engaged by said separator wheel;

articles traveling downwardly in said bin means bearing first against said first straight part of said shroud member, secondly against said curved part of said shroud member, and thirdly against said separator wheel, said separator wheel providing a curvature that is complementary to the curvature provided by said shroud member;

whereby articles having a thickness ranging from the thickness of a sheet of paper up to approximately one-quarter inch are shingled first by said shroud member and thereafter by said separator wheel and are then dispensed from said sheet feeder.

2. The sheet feeder of claim 1, wherein said separator wheel is nonrotationally mounted.

3. The sheet feeder of claim 1, wherein said separator wheel is rotationally mounted.

4. The sheet feeder of claim 3, wherein said separator wheel is mounted for rotation in a direction counter to a direction of said articles as they enter into said nip area.

5. The sheet feeder of claim 4, wherein said separator wheel rotates at a speed of about eight thousandths of an inch per second.