Method and apparatus for leak testing closed containers
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01M-003/36
G01M-003/16
G01M-003/32
출원번호
US-0207148
(2002-07-30)
발명자
/ 주소
Lehmann, Martin
대리인 / 주소
Antonelli, Terry, Stout & Kraus, LLP
인용정보
피인용 횟수 :
6인용 특허 :
20
초록▼
Leak testing a closed container with at least one flexible wall area is performed with the method and apparatus wherein a biasing arrangement compresses or expands the container under test. A biasing force is monitored with a force detector applicable to the wall of the container. The force detector
Leak testing a closed container with at least one flexible wall area is performed with the method and apparatus wherein a biasing arrangement compresses or expands the container under test. A biasing force is monitored with a force detector applicable to the wall of the container. The force detector generates an electric output first biasing force signal at a first point in time which is stored for comparison with the monitored biasing force signal at a second subsequent point in time to generate a different signal as a leak indicative signal. A difference signal is generated at the first point in time from the first force measuring signal stored and the first force measuring signal. This latter difference signal is stored as a zero offset signal which is used to compensate zero offset of the generated difference signal.
대표청구항▼
Leak testing a closed container with at least one flexible wall area is performed with the method and apparatus wherein a biasing arrangement compresses or expands the container under test. A biasing force is monitored with a force detector applicable to the wall of the container. The force detector
Leak testing a closed container with at least one flexible wall area is performed with the method and apparatus wherein a biasing arrangement compresses or expands the container under test. A biasing force is monitored with a force detector applicable to the wall of the container. The force detector generates an electric output first biasing force signal at a first point in time which is stored for comparison with the monitored biasing force signal at a second subsequent point in time to generate a different signal as a leak indicative signal. A difference signal is generated at the first point in time from the first force measuring signal stored and the first force measuring signal. This latter difference signal is stored as a zero offset signal which is used to compensate zero offset of the generated difference signal. roke in which the form tooth moves out of the cavity then at the forming station, and a dwell period in which the form tooth dwells while the form gear indexes. 2. The machine according to claim 1, wherein the punch unit further includes a hold finger engageable with an outgoing node of a corrugation of the strip against the tip of the tooth of the form gear on the outgoing side of the cavity then at the forming station during a substantial portion of the duration of each forming stroke of the form tooth. 3. The machine according to claim 1, wherein the punch actuator includes an electronically-controlled linear servomotor. 4. The machine according to claim 3, wherein the punch unit includes a fixed tool guide having a guideway receiving a portion of the form tooth for guided axial movement. 5. The machine according to claim 4, wherein the punch unit includes a tool support affixed to the output shaft of the linear actuator and the form tooth is carried by the tool support for universal swiveling motion relative to the tool support. 6. The machine according to claim 1, wherein the rotary drive includes an electronically-controlled rotary servomotor. 7. The machine according to claim 1, wherein the rotary drive includes an electronically-controlled rotary servomotor, and the punch actuator includes an electronically-controlled linear servomotor. 8. The machine according to claim 1, wherein the rotary drive includes an electronically-controlled rotary servomotor, the punch actuator includes an electronically-controlled linear servomotor, and the drives are controlled in a master-slave relationship. 9. The machine according to claim 1, and further comprising a foil exit guide shoe extending along a segment of the form gear immediately downstream of the forming station and having a guide surface in close clearance with outer nodes of an outgoing corrugated portion of the foil strip so as to retain the outgoing corrugated portion of the foil strip in a multiplicity of cavities of the form gear. 10. The machine according to claim 1, wherein the form tooth of the punch unit is shaped to only partially form the corrugations, and further comprising a second punch unit located at a second forming station along the circumference of the form gear, the second forming station being spaced apart from the forming station, the second punch unit having a second form tooth receivable seriatim in the cavities of the form gear and shaped to fully form the corrugations in the foil strip and a second reciprocating linear actuator driving the second form tooth radially of the form gear in a succession of forming cycles, each of which includes a forming stroke in which the second form tooth moves into a cavity then at the second forming station, a return stroke in which the second form tooth moves out of the cavity then at the second forming station, and a dwell period in which the second form tooth dwells while the form gear indexes, each forming cycle of the second form tooth being in phase with the forming cycle of the form tooth of the punch unit. 11. The machine according to claim 10, wherein the second punch unit includes a pair of second hold fingers, one arranged to engage an in going node of a corrugation of the strip against the tip of the tooth of the form gear on the in going side of the cavity then at the second forming station during a substantial portion of the duration of each forming cycle of the second form tooth and the other arranged to engage an outgoing node of a corrugation of the strip against the tip of the tooth of the form gear on the outgoing side of the cavity then at the second forming station during a substantial portion of the duration of each forming cycle of the second form tooth. 12. A machine for corrugating a metal foil strip, comprising a form gear having equally spaced-apart identical teeth defining a multiplicity of identical cavities along the circumference of the form gear, an electronically-controlled r otary servomotor rotating the form gear intermittently to index successive cavities to a forming station along the perimeter of the form gear where a corrugation is at least partly formed in a cavity then at the forming station while the rotary drive dwells, and a punch unit located at the forming station, the punch unit having a form tooth receivable seriatim in the cavities of the form gear and adapted thereby to at least partly form corrugations in the foil strip, an electronically-controlled linear servomotor driving the form tooth radially of the form gear in a succession of forming cycles, each of the forming cycles including a forming stroke in which the form tooth moves into a cavity then at the forming station, a return stroke in which the form tooth moves out of the cavity then at the forming station, and a dwell period in which the form tooth dwells while the form gear indexes, and a hold finger arranged to engage an outgoing node of a corrugation of the strip against the tip of the tooth of the form gear on the outgoing side of the cavity then at the forming station during a substantial portion of the duration of each forming cycle of the form tooth. 13. The machine according to claim 12, wherein the servomotors are controlled in a master-slave relationship. 14. The machine according to claim 12, wherein the punch unit includes a fixed tool guide having a guideway receiving a portion of the form tooth for guided axial movement. 15. The machine according to claim 12, wherein the punch unit includes a fixed tool guide having a guideway receiving a portion of the hold finger for guided axial movement. 16. The machine according to claim 15, wherein the punch unit includes a tool support affixed to the output shaft of the linear actuator and the form tooth is carried by the tool support for universal swiveling motion relative to the tool support. 17. A machine for corrugating a metal foil strip, comprising a form gear having equally spaced-apart identical teeth defining a multiplicity of identical cavities along the circumference of the form gear, an electronically-controlled rotary servomotor rotating the form gear intermittently to index successive cavities to first and second forming stations along the perimeter of the form gear where corrugations are formed in the cavities while the rotary drive dwells, and a punch unit located at each of the forming stations, each punch unit having a form tooth receivable seriatim in the cavities of the form gear and adapted thereby to at least partly form corrugations in the foil strip, an electronically-controlled linear servomotor driving the form tooth radially of the form gear in a succession of forming cycles, each of the forming cycles including a forming stroke in which the form tooth moves into a cavity then at the forming station, a return stroke in which the form tooth moves out of the cavity then at the forming station, and a dwell period in which the form tooth dwells while the form gear indexes, and a hold finger arranged to engage an outgoing node of a corrugation of the strip against the tip of the tooth of the form gear on the outgoing side of the cavity then at the forming station during a substantial portion of the duration of each forming cycle of the forming unit. 18. The machine according to claim 17, wherein the servomotors are controlled in a master-slave relationship. 19. The machine according to claim 17, wherein each punch unit includes a fixed tool guide having a guideway receiving a portion of the form tooth for guided axial movement. 20. The machine according to claim 19, wherein the punch unit includes a fixed tool guide having a guideway receiving a portion of the hold finger for guided axial movement. 21. The machine according to claim 20, wherein each punch unit includes a tool support affixed to the output shaft of the linear actuator and the form tooth is carried by the tool support for universal swiveling motion relative to t
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