![]() There is something clearly missing from the pendulum assembly - if I measure the timber case from the centre of the dial to the centre of the hole where the pendulum is visible I get approx 165mm, laying out the movement and pendulum so they are the same spacing apart there is a gap of approx 40mm between the hook end of the pendulum and the flat spring hanging from the movement, this is the bit that is missing. It looks an interesting curiosity I might try to get it working and present it back to my mother. The small piece of brass shim looks slightly damaged - possibly the pendulum has been forcibly removed, the flat spring is quite thin and in a confined spot so I'd need to remove it from the movement to get a better look at how the pendulum is attached. ![]() The flat spring has a slot and a brass shim with 2 tabs that fit in the slot - it looks like the pendulum is meant to be permanently fitted to the movement, a clamp is fitted the bottom the movement that clamps the pendulum for transportation. I tried a battery, the motor is working and does wind the spring - with no pendulum there is no action from the movement, of course I may well be wrong on how it works, when I get more time I'll strip it down and post more photos. I pulled the movement out of the plastic case, it looks as if the motor winds a spring which powers the movement, as the spring unwinds a cam closes switch contacts - the motor is activated and it winds the spring - possibly one turn, with existing preload it is enough to power the movement (an assumption) - a second cam opens the contacts - the motor stops - I can see an escape wheel and rather than a pallet assembly there is a disc with 2 pins, the wire protruding from the bottom is attached directly to this disc with the 2 pins, this wire has a loop in it, the pendulum hangs from the flat spring and passes through the loop, so looks like the pendulum gets its impulse in the regular way from a spring via an escape wheel. No 0 jewels an hour or so of internet search has come with zero. The inside of the movement is stamped Nittoh Clock Co. I'm not 100% sure how it works but I'm guessing the motor provides impulse for the pendulum, which does the time keeping, the length is adjustable as in a fully mechanical clock movement, not having delved any deeper I'm not sure if the impulse applied to the pendulum is regular or if impulse is applied once the pendulum swing has decayed to a certain point. Something is either missing or broken on the spring as the hook on the pendulum simply slides off I found this curiosity in the bottom of a drawer while clearing out some of my late fathers things, the movement looks to be electromechanical, inside the clear case I can see a small motor, some pinions/gears etc a 1.5V battery holder.Ī wire protrudes from the bottom, working this from side to side advances the hands so if the wire is moved from side to side at the correct beat it should keep time - just inside the bottom of the movement I can see a flat spring hanger for the pendulum, as the pendulum swings from side to side it pushes the wire from side to side to advance the hands.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |