The Tens Carry mechanism of a Stepped Drum machine (Rheinmetall) page 2

As we have seen it on previous machines, the tens carry is needed when a digit changes from nine to zero. The next higher digit should be increased one. The tens carry mechanism of the Stepped drum machine, from page 1, is outlined below on this page. The two photo's below are of the carriage backside. The second gearwheel from the right shows is on the nine position. From nine to zero the knock is pushing the plate down. The plate is on the right hand site of de digit, but remember we looking to the back site of the carriage, so from the front its to the left, or towards the next higher digit.

The three photo's below showed the sequence of the gears behind the carriage, on the main machine body. The most left is the idle position. The middle is showing the lift of the gearwheels to feed the gears on the carriage. The photo to the right is showing the situation when the plate from the carriage as shown above, is pushing the right pin down (now hided behind the trench in the plate). This pushing of the pin lowers a gear wheel on the next digit axis. (seen under the plate). This gearwheel is getting one teeth increase by a pin mounting on block mounted on the same axis as the Stepped drum. The video below is showing this.

This video is take from the backside of the machine. The pinion is hard to see, now in the back of the picture. You see the block is pushing the gearwheel up again, after a pin has turned the pinion one teeth, as you would expected from a tens carry. (On the square shaft of the pinion you will see the turning better.)

Zero settings most brands, pictures are of a Rheinmetall machine.

The two registers in the carriage are reset to zero by the two racks. The teeth of one rack are alternating located

The two drawings are from: Rechenautomat.de

Total drawing Rheinmetall machine

Tens carry mechanism of the Madas full automats

The picture to the left below shows a partly non destructive dismantled Madas 20AV. For more pictures please see at Madas H.W. Egli at the menu left, manufactures sorted.
I like to describe the tens carry of the counter, register 2. The mechanism is located directly above the key board or the second rack, from the top on the picture. This mechanism is relatively simple but differs, in terms of engagement, from the most other stepped drum brands. The combination of the:

• numeral wheel, with a spur gear on one site (for engagement by the square fingers of the daisy chain)
• slotted disk, with an cutout at the nine position, attached, on the same axis as, to the numeral wheel assembly
• the oscillating carry arm formed by a daisy chain rack assembly with two finger per digit in between the numbered gear and the slotted disk, located square under those wheel and disk.

makes it special compact an fast. The drawing shows it without the cap. The Photo below shows it as bottom view.

The daisy chain / oscillated arm is the most special and is showed in 4 situations above. The first picture to the left is in the rest position. Engaging starts by turning to the right (picture two). Going to the back (left from the normal operator position) Then turning left and comes forward to the rest position again. (Not all situation have pictures).
This axis has two finger per digit. The second finger (left) is stiff connected to the first finger(right) of the next digit. To show that a screw driver, on the third picture, pushes the second finger, of digit two, to the left. All the previous digit fingers turn to left as well. Picture four shows it on digit four.
Now remember the position of the fingers in the carriage. (please see the drawing) Finger one is between the numbered gear and the plate with the opening at the nine of the numbered gear. When a nine is on, the middle digit on the drawing, finger two is not stopped and takes pin one of the next digit to the numbered gear of the next digit. The axial movement to the left is increase that next digit with one, the tens carry. When there are more nines, the same procedure for all those.
The fingers one are pulled towards their rest position by radial mounted springs.

Via the left hand menu, under Madas/ H.W.Egli, you will find the restoration details of two Madas 20AV machines linked by the text book icon on the referred page top).

I strongly recommend reading John Wolff's Web Museum, it was of help to me at repairing and understanding the processes of my Madas 20AV machines, Thanks!