US 4,375,920 AGranted

Area meter

AssigneeLI-COR, Inc.

InventorsJohn H. Wurm, Lyle R. Middendorf, William W. Biggs

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Abstract

To synchronize the belt of a conveyor, a scanner, a fluorescent lamp, and an LED display unit of an area meter, the main AC power supply of the area meter drives the conveyor belt through a synchronous motor and supplies the same frequency of power to a phase locked loop. The phase locked loop provides synchronous pulses of higher frequencies to the scanning system, fluorescent lamp and LED display unit to maintain synchronism. The resolution of the measuring system is optimized when changes are made in the size of the area that is scanned by adjusting: (1) the lens of the scanner; (2) the rate of readout of the pulses from the scanner; and (3) the decimal place of the display unit. Travel from side to side of the belt is avoided by individually adjusting the ends of the pulleys until the belt runs true and an idler which lifts both bottom and top run of the belt when an object moves under it prevents slippage of the belt with respect to the rollers and the bite of the conveyor is adjustable.

Claims20

Dependent claims

Apparatus comprising:

measuring means for generating a plurality of area pulses related to the area of an object to be measured;
conveyor means for moving the object to be measured and the measuring means with respect to each other;
said measuring means including sensing means for generating a plurality of dimension pulses proportional to at least one dimension of said object to be measured and focusing means for focusing an image of at least a portion of said object to be measured onto the sensing means;
said focusing means including replaceable means for focusing different sizes of said portions of said object across a predetermined length of said sensing means;
said measuring means further including counting means for counting said pulses, whereby said counted pulses provide an indication of said area of said object;
said counting means including means for dividing said count by a predetermined number, whereby said area of said object is accurately represented even though said image is changed in size;
said conveyor means for moving the object and measuring means with respect to each other includes a conveyor and means for moving said conveyor;
said means for moving said conveyor includes a synchronous motor and alternating current means for applying power to said synchronous motor;
said measuring means includes pulse means for generating basic-timing pulses proportional to the rate at which said object is moved with respect to said measuring means;
and
said pulse means includes phase locked loop means for generating basic-timing pulses in synchronism with said alternating current from said alternating current means.

8 more elements

Apparatus comprising:

measuring means for generating a plurality of area pulses related to the area of an object to be measured;
conveyor means for moving the object to be measured and the measuring means with respect to each other;
said measuring means further including counting means for counting said pulses;
said measuring means further including means for changing the relationship between the number of said area pulses and the area of said object;
said counting means including means for dividing said count by a predetermined number, whereby said area of said object is accurately represented even though said relationship is changed;
said measuring means including a sensing means for generating pulses representing at least one dimension of said object to be measured;
means for focusing an image of said object to be measured onto said sensing means;
and
said means for dividing including means for dividing substantially in accordance with the square of the factor by which the dimension of the image focused on the sensing means is changed by said focusing means in a direction perpendicular to the direction of motion of the measuring means and object with respect to each other.

6 more elements

Apparatus comprising:

measuring means for generating a plurality of area pulses related to the area of an object to be measured;
conveyor means for moving the object to be measured and the measuring means with respect to each other;
said measuring means further including counting means for counting said pulses;
said measuring means further including means for changing the relationship between the number of said area pulses and the area of said object;
said counting means including means for dividing said count by a predetermined number, whereby said area of said object is accurately represented even though said relationship is changed;
said measuring means including a sensing means for generating pulses representing at least one dimension of said object to be measured;
means for focusing an image of said object to be measured onto said sensing means;
said means for dividing including means for dividing substantially in accordance with the square of the factor by which the dimension of the image focused on the sensing means is changed by said focusing means in a direction perpendicular to the direction of motion of the measuring means and object with respect to each other;
said conveyor means including a plurality of said belts and a plurality of belt rollers, each of said belt rollers being adjustable in angle on each of its ends;
said belts comprising a top belt having top and bottom runs and a bottom belt;
said top belt including an idler roller assembly;
said idler roller assembly including first and second rollers;
said first and second rollers having their outer rims spaced a distance from each other equivalent to the distance between the top and bottom runs of said top belt and greater than the diameter of said rollers;
said bottom roller of said assembly being against the top of the bottom run and the top roller being against the bottom of the top run;
means for pivoting said top and bottom idler rollers with respect to a point removed from them whereby an object lifting the bottom run of said top conveyor moves said idler assembly upwardly and causes the top run of said conveyor to be lifted by the top idler roller;
said measuring means including a fluorescent lamp;
drive means for driving said fluorescent lamp;
and
means for driving said drive means in synchronism with pulses from said phase locked loop.

16 more elements

Apparatus comprising:

measuring means for generating a plurality of pulses related to the area of an object to be measured;
conveyor means having an adjustable bite for moving the object to be measured and the measuring means with respect to each other;
said measuring means including sensing means for generating a plurality of pulses proportional to at least one dimension of said object to be measured and pulse means for generating pulses proportional to the rate at which said object is moved with respect to said measuring means and counting means for counting said pulses;
said means for moving including first and second endless belts adjacent to each other;
said top and bottom endless belts each including top and bottom runs at least one of which curves outwardly;
a feed path between said first and second endless belts;
said means for driving including means for driving said first and second endless belts so that the bottom run of the top belt moves at the same speed and against the top run of the bottom belt;
said top belt including an idler roller assembly;
said idler roller assembly including first and second rollers;
said first and second rollers having their outer rims spaced a distance from each other equivalent to the distance between the top and bottom runs of said top belt where said one belt is curved outwardly;
said bottom roller of said assembly being against the top of the bottom run and the top roller being against the bottom of the top run;
means for pivoting said top and bottom idler rollers with respect to a point removed from them whereby an object lifting the bottom run of said top conveyor moves said idler assembly upwardly and causes the top run of the conveyor to be lifted by the top idler roller;
said belts including a plurality of rollers, each of said rollers being adjustable in angle on each of its ends;
said measuring means including means for providing pulses from said sensing means proportional to said one dimension at time increments proportional to pulses, generated by said pulse means;
said one dimension being at an angle to the direction in which said object and measuring means are being moved with respect to each other;
said means for moving the object and measuring means with respect to each other includes a conveyor and means for moving said conveyor;
said means for moving said conveyor including a synchronous motor and alternating current means for applying power to said synchronous motor;
and
said pulse means includes phase locked loop means for generating pulses in synchronism with said alternating current from said alternating current means.

16 more elements

Dependencies are inferred from the claim text.