Dwell cam

A dwell cam is an intermittent motion mechanism that alternates forward and return motion with holding position^[1].

Dwell cams are often used in pairs in sewing machines to operate the four motion feed dogs, with one cam moving the dog up and down, and the other cam moving the dog forwards and backwards. The cams in this application are usually phased 90 degrees apart allowing a pause in the up/down movement of the dog while it is being moved forwards/backwards. A separate adjustable sliding block or link is used to control the amount of forwards/backwards movement of the dog.

See also

• Cam
• Camshaft
• Geneva drive

References

1. ^ Pennock, G., Shigley, J., & Uicker, J. (2010). Cam Design. Theory of Machines and Mechanisms (4 ed., p. 201). New York: Oxford University Press, USA.

This article about a mechanical engineering topic is a stub. You can help Wikipedia by expanding it.v · Categories: Mechanisms Mechanical engineering stubs Wikimedia Foundation. 2010. Игры ⚽ Нужна курсовая? Staying Together Hans Oehler Look at other dictionaries: Cam — A cam is a projecting part of a rotating wheel or shaft that strikes a lever at one or more points on its circular path. The cam can be a simple tooth, as is used to deliver pulses of power to a steam hammer, for example, or an eccentric disc or… …   Wikipedia Dwell — means to live in a place, a dwelling. It may also refer to: In gun accurizing, bullet dwell time, time between cartridge ignition, and the time the bullet leaves the barrel. Dwell, a leading UK furniture and accessories company Dwell (magazine),… …   Wikipedia dwell — /dwɛl / (say dwel) verb (i) (dwelt or dwelled, dwelling) 1. to abide as a permanent resident. 2. to continue for a time. –noun Machinery 3. a pause occurring regularly when a machine is in operation. 4. a flat part on a cam which, during part of… …   dwell — [1] In a contact breaker ignition system, the number of degrees the breaker cam rotates from the time the breaker points close until they open again. Also called the dwell angle or dwell period. [2] In a breakerless ignition system, the time… …   Dictionary of automotive terms dwell — dweller, n. /dwel/, v., dwelt or dwelled, dwelling, n. v.i. 1. to live or stay as a permanent resident; reside. 2. to live or continue in a given condition or state: to dwell in happiness. 3. to linger over, emphasize, or ponder in thought,… …   Universalium dwell meter — An instrument which determines the number of degrees the breaker cam rotates while the breaker points are closed. Changing the point gap affects the dwell angle. When the breaker points are correctly gapped, the distributor can give the proper… …   Dictionary of automotive terms cam angle — See dwell …   Dictionary of automotive terms Geneva drive — Animation showing a six position Geneva Drive in operation The Geneva drive or Maltese cross is a gear mechanism that translates a continuous rotation into an intermittent rotary motion. The rotating drive wheel has a pin that reaches into a slot …   Wikipedia Ignition system — For other uses, see Ignition system (disambiguation). An ignition system is a system for igniting a fuel air mixture. Ignition systems are well known in the field of internal combustion engines such as those used in petrol (gasoline) engines used …   Wikipedia motion-picture technology — Introduction       the means for the production and showing of motion pictures. It includes not only the motion picture camera and projector but also such technologies as those involved in recording sound, in editing both picture and sound, in… …   Universalium 18+ © Academic, 2000-2024 Contact us: Technical Support, Advertising Dictionaries export, created on PHP, Joomla, Drupal, WordPress, MODx. Mark and share Search through all dictionaries Translate… Search Internet Share the article and excerpts Direct link … Do a right-click on the link above and select “Copy Link”