Take-up spool clutch with delayed engagement
US5568214A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 1, 1995 |
| Grant date | Oct 22, 1996 |
| Priority date | — |
| Expiry date | Jun 1, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B17/425
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a camera, a take-up spool clutch assembly (34) is provided with delayed engagement by disposing a clutch spring (32) between a take-up spool (10) and a drive gear (30). The clutch spring (32) engages a lug (46) on a hub portion (40) of the take-up spool (10) with a second end (64) to drive the take-up spool (10) in the take-up direction (36) when the drive gear (30) engages a first end (60) of the clutch spring (32). Before the take-up spool (10) can rotate in the take-up direction (36) after being rotated in the rewind direction (37), the drive gear (30) must complete substantially one revolution to re-engage the second end (64) of the clutch spring (32) into driving engagement with the lug (46). The time interval consumed by the single revolution of the drive gear spool (30) is sufficient to allow a planetary clutch (90) to disengage a rewind gear (97) and engage a thrust gear (96) with a supply spool (79).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.