to DMG-Lib main page
Home  · Site map  · Contact  ·

Advanced Search   Mechanism Search

SCREW-TYPE DISENGAGING MECHANISM

Click to enlargeClick to enlarge Description

Driven shaft A, on which a screw thread has been cut, is rotated by toothed clutch member 1 which engages cross-shaped member 2. Link 2 is rigidly connected to drive shaft B. By means of a friction clutch consisting of disks 3 and 4 and springs 5, adjusted by screws 6, teeth on clutch member 1 are brought into positive engagement with those on disk 3 so that member 1 rotates at the same speed as link 2 and drive shaft B. The friction and toothed clutches are held in the engaged position by pin a secured in rod C which slides within shaft A. Half-nut 7 bears against pin b of rod C when the half-nut is in its extreme left-hand position. The dimensions of screw A and half-nut are selected so that the half-nut can be engaged to or disengaged from screw A by horizontal motion of handle 8. Cam slot c in handle 8 actuates pin d of slide 9, moving the slide and half-nut 7 in the direction shown by the arrow. When half-nut 7 is engaged in its extreme left-hand position to screw A, it travels to the right to the position shown. Here it disengages clutch member 1 from cross-shaped member 2 so that shaft A stops after having turned a definite number of revolutions that depend on the length of the screw and its pitch. To engage shaft A again so that the machine, connected to shaft A, is started, half-nut 7 is disengaged by pulling handle 8. At this half-nut 7 is shifted by springs 10 along guides 11 to the left where it strikes pin b so that pin a engages the friction and then toothed clutches. The exact number of revolutions of shaft A from the instant it starts to the instant it stops can be regulated by setscrew 12 in half-nut 7. Its overhang determines the instant the toothed clutch is disengaged.
$2246$LS,SE$

Linked items
Documents: Lever mechanisms  [Streambook]
Permanent links
DMG-Lib FaviconDMG-Lib https://www.dmg-lib.org/dmglib/handler?image=25370023
Europeana FaviconEuropeana  http://www.europeana.eu/portal/record/2020801/dmglib_handler_image_25370023.html
Data provider
ITUIlmenau TU  http://www.tu-ilmenau.de
nach oben up
×