IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0462732
(2006-08-07)
|
등록번호 |
US-7631536
(2009-12-24)
|
우선권정보 |
EP-05107333(2005-08-10) |
발명자
/ 주소 |
- Genoud, Dominique
- Köppel, Thomas
- Emery, Jean Christophe
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
3 인용 특허 :
6 |
초록
▼
The calibration weight arrangement for an electronic balance (1) with a force-measuring cell (6) has a calibration weight (14) which can be coupled to the force-measuring cell (6). A transfer mechanism and a drive source are used to move the calibration weight vertically, in order to establish, as w
The calibration weight arrangement for an electronic balance (1) with a force-measuring cell (6) has a calibration weight (14) which can be coupled to the force-measuring cell (6). A transfer mechanism and a drive source are used to move the calibration weight vertically, in order to establish, as well as to release, the force-transmitting contact between the calibration weight and the force-measuring cell. The transfer mechanism has at least one resetting element (122), a lifting system (110) configured as a knee-joint linkage (117), and a multi-stable positioning element (115). Due to the feedback from the multi-stable positioning element, whose first stable state defines the calibrating position (132) and whose second stable state defines the rest position (133) of the transfer mechanism, the actuator (118) is energized only during the phases when the transfer mechanism is moving.
대표청구항
▼
What is claimed is: 1. A calibration weight arrangement for a gravimetric measuring instrument having a force-measuring cell comprising a fixed part and a load-receiving part, the calibration weight arrangement comprising: at least one calibration weight, adapted to be coupled to the load-receiving
What is claimed is: 1. A calibration weight arrangement for a gravimetric measuring instrument having a force-measuring cell comprising a fixed part and a load-receiving part, the calibration weight arrangement comprising: at least one calibration weight, adapted to be coupled to the load-receiving part; a transfer mechanism for transferring the at least one calibration weight during a phase of movement from a rest position into a calibrating position and from the calibrating position to the rest position, the transfer mechanism comprising: at least one resetting element, selected from the group consisting of: an arm spring, a torsion-bar spring, a leaf spring, a compressive coil spring and a tensile coil spring; a lifting system; and a drive source that comprises a non-self-locking actuator that is energized only during the movement phase, and a bi-stable or tri-stable positioning element, with a first stable state thereof defining the calibrating position, a second stable state thereof defining the rest position, and with the third stable state, if present, located between the calibrating and rest positions. 2. The arrangement of claim 1, wherein: the resetting element has a resetting force that is greater than the maximum weight force of the at least one calibration weight and of the forces of the transfer mechanism acting in the direction of the load as well as of the resistance forces resulting from friction in the transfer mechanism, and wherein the resetting force of the resetting element holds the transfer mechanism in a position defined by a stable state of the bi-stable or tri-stable positioning element. 3. The arrangement of claim 2, wherein: the actuator is supplied with energy in the form of at least one energy pulse. 4. The arrangement of claim 3, wherein: the actuator is supplied with a single energy pulse of sufficient strength to transfer the at least one calibration weight from the rest position into the calibrating position, or vice versa, at the beginning of each movement phase. 5. The arrangement of claim 4, wherein: the lifting system comprises at least one knee-joint linkage. 6. The arrangement of claim 1, wherein: the bi-stable or tri-stable positioning element comprises a guide bolt and a guide element having a guide groove, the guide groove comprising first and second segments, the calibrating position, third and fourth segments and the rest position, wherein the actuator is energized only when the guide bolt moves through the first and second segments to a first turn-around point, and when the guide bolt moves through the third segment starting from the calibrating position and proceeding to a second turn-around point. 7. A method of checking and defining the state of a calibration weight arrangement, the method comprising the steps of: a. providing a calibration weight arrangement having a bi-stable or tri stable positioning element as defined in claim 1; b. determining a reference signal value of the force-measuring cell and storing the reference signal value in memory; c. supplying an energy pulse to the actuator; d. determining a weighing signal value of the force-measuring cell; e. comparing the reference value to the weighing signal value; and f. supplying a further energy pulse to the actuator if the weighing signal value is larger than the reference signal value. 8. The arrangement of claim 1, wherein: the bi-stable or tri-stable positioning element comprises a guide bolt connected to the fixed part and at least one guide element having a heart-shaped guide groove, wherein the outward-pointing corner of the heart shape corresponds to the rest position and the inward-pointing cusp of the heart shape corresponds to the calibrating position, wherein the guide bolt engages the guide groove. 9. The arrangement of claim 8, further comprising: a thin bending-spring connection, arranged between the lifting system and the bi-stable or tri-stable positioning element, the thin bending-spring connection being in a neutral condition with regard to bending stresses when the guide bolt is between the calibrating position and the rest position. 10. The arrangement of claim 1, wherein: the bi-stable or tri-stable positioning element comprises a guide bolt connected to the fixed part, at least one guide element in the form of a rotatably supported cylinder or sleeve that is connected to the lifting system, the cylinder wall of the guide element comprising at least one guide groove with at least the two positions that respectively represent the calibrating position and the rest position, wherein the guide bolt engages the guide groove. 11. The arrangement of claim 1, wherein: the resetting element, the lifting system and the bi-stable or tri-stable positioning element comprise at least three formed components which are connected to each other directly or through suitable connecting means. 12. The arrangement of claim 1, wherein: the resetting element, the lifting system, and at least part of the bi-stable or tri-stable positioning element are formed as a monolithic piece. 13. The arrangement of claim 1, wherein: the non-self-locking actuator is a linear driving mechanism. 14. The arrangement of claim 13, wherein: the non-self-locking actuator acts on the transfer mechanism through at least one of: a pulley and a lever. 15. The arrangement of claim 1, wherein: the actuator is supplied with energy in the form of at least one energy pulse. 16. The arrangement of claim 1, wherein: the actuator is supplied with a single energy pulse of sufficient strength to transfer the at least one calibration weight from the rest position into the calibrating position, or vice versa, at the beginning of each movement phase. 17. The arrangement of claim 1, wherein: the lifting system comprises at least one knee-joint linkage. 18. A method of checking and defining the state of a calibration weight arrangement, comprising the steps of: a. providing a calibration weight arrangement with a bi-stable or tri-stable positioning element as defined by claim 1; b. determining a reference signal value of the force-measuring cell and storing the reference signal value in memory with the position number one; c. passing through each further stable position until the position of the reference signal value is reached again, determining a respective weighing signal value of the force measuring cell in each such stable position, and storing the respective weighing signal value with a position number in the order of sequence in which the stable position was passed through; d. comparing the weighing signal values and the reference signal value with each other, determining the smallest signal value, and determining the position of the smallest signal value relative to the position of the reference value; and e. passing through the stable positions of the bi-stable or tri-stable positioning element, starting from the position associated with the reference value, until the position with the smallest signal value has been reached.
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