# US 7,612,304 B2 · Load measuring mechanism

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- Number: US 7,612,304 B2
- Document ID: US7612304B2
- Status: Granted
- Kind: B2
- Application number: 10/544,258
- Filed: 2003-07-30
- Published: 2007-01-25
- Granted: 2009-11-03
- Earliest claimed: 2003-02-07
- Assignees: Shinko Denshi Company Limited
- Inventors: Masaaki Kobayashi; Toshitaka Harikai; Masaru Ikeshima
- Web page: https://patentgrep.com/patent/US7612304B2

## CPC

- G01G 21/24: Guides or linkages for ensuring parallel motion of the weigh-pans
- G01G 21/244: {combined with flexure-plate fulcrums (flexure-plate fulcrums G01G21/07)}
- G01G: WEIGHING (sorting by weighing B07C5/16)

## Abstract

In a load measuring mechanism capable of easily adjusting a positional deviation error by means of a positional deviation error adjusting portion, a load receiving portion 3 is connected to a substrate portion 2 by means of parallel link portions 4a, 4b via flexures 5a-5d, a finely deformable portion 2a is provided at an upper portion of the substrate portion 2, and the flexure 5a is coupled with the deformable portion 2a. Positional deviation error adjusting portions 10 are provided on both sides of the substrate portion 2, a base portion 12 of the positional deviation error adjusting portion 10 is connected to a first lever 13 via a fulcrum 15, and the first lever 13 is coupled with a second lever 14 via a flexible portion 16. When a distance between the base portion 12 and the first lever 13 is increased by rotating an adjusting bolt 11, this displacement is transferred to an end 14a of the second lever 14. Then, a deviation force is applied to the flexure 5a by means of an end 14b of the second lever 14 secured between the deformable portion 2a and the flexure 5a such that a height of the flexure 5a is changed to adjust the positional deviation error.

## Claims

### Claim 1

A load measuring mechanism comprising a load converting unit formed by a Roberval mechanism having a substrate portion and a load receiving portion coupled with the substrate portion by means of flexures, and a positional deviation error adjusting unit provided on a side of said load converting unit for adjusting the positional deviation error by applying a deviation force to a neighborhood of a flexure to adjust a height of the flexure, wherein said positional deviation error adjusting portion includes a base portion, a first lever and a second lever, said first lever is coupled with said base portion by means of a fulcrum, a first end of the first lever is coupled with a first end of the second lever by means of a flexible portion, said base portion is secured to said substrate portion, a second end of the second lever opposite to said first end coupled with the flexible portion is secured to a neighborhood of said flexure, and said positional deviation error adjusting portion is constructed such that a distance between the base portion and a second end of the second lever opposite to said first end coupled with the flexible portion is changed by changing a distance between said base portion and said first lever.

### Claim 2 (depends on 1)

The load measuring mechanism according to claim 1, wherein said load converting unit is formed by cutting a single metal block.

### Claim 3 (depends on 1)

The load measuring mechanism according to claim 1, wherein said positional deviation error adjusting portion is formed by cutting a single metal block.

### Claim 4 (depends on 1)

The load measuring mechanism according to claim 1, wherein said load converting unit and said positional deviation error adjusting portion are formed by cutting a single metal block.

### Claim 5 (depends on 1)

The load measuring mechanism according to claim 1, wherein the distance between said base portion and said first lever is changed by a bolt.

### Claim 6 (depends on 5)

The load measuring method according to claim 5, wherein said bolt is formed by a differential bolt.

### Claim 7 (depends on 1)

The load measuring mechanism according to claim 1, wherein a pair of said positional deviation error adjusting portions are arranged on both sides of the load converting unit.