ppt on project of geneva mechanism
#1

i would like to get ppt on geneva mechanism used in industries ,geneva mechanism where conveyor belt is used
Reply
#2

The Geneva mechanism is a timing device. According to Vector Mechanics for Engineers by Ferdinand P. Beer and E. Russell Johnston Jr., it says: "It is used in many counting instruments and in other applications where intermittent rotary motion is required." (945) In essence, the Geneva mechanism consists of a rotating disc with a pin and another rotating disc with grooves (generally four) in which the pin slides.


According to Brittanica.com, the Geneva mechanism was originally invented by a watch manufacturer. The watch manufacturer only put a limited number of slots in one of the rotating disks so that the system could only go through so many rotations. This prevented the spring on the watch from being wound too tight, thus giving the mechanism its other name, the Geneva stop. The Geneva stop was incorporated into many of the first movie projectors used in theaters.


[Image: geneva.gif]

In optimum design of mechanical elements, Ray C. Johnson makes many references to the use of the Geneva mechanism to provide an intermittent motion conveyor belt of a "film recording run." (13) It also examines several weaknesses of the Geneva Mechanism. For example, for each rotation of the Geneva gear (grooved) the drive shaft must make a complete rotation. Thus, at very high speeds, the drive shaft may begin to vibrate. Another problem is the wear, which is centralized in the drive pin. Finally, the designer has no control over the acceleration that the Geneva mechanism will produce.

The Geneva unit or Maltese cross is a gear mechanism that translates a continuous rotation into an intermittent rotary motion. The rotatable drive wheel has a pin that reaches a slot of the driven wheel which advances by one step. The drive wheel also has a raised circular locking disc which locks the driven wheel in position between steps.

The name derives from the earliest application of the device in mechanical watches; Geneva in Switzerland is an important watchmaking center. The Geneva unit is also commonly known as a Maltese cross mechanism due to visual similarity when the driven wheel has four spokes. Since they can be made small and capable of withstanding substantial mechanical stress, these mechanisms are often used in clocks.

An application of the Geneva unit is on the film projectors: the film does not run continuously through the projector. Instead, the film is advanced frame by frame, with each frame remaining in front of the lens for 1/24 of a second (and exposed twice in that time, resulting in a 48 Hz frequency). This intermittent movement is achieved using a Geneva unit. (Modern cinema projectors can also use an electronically controlled indexing mechanism or a stepper motor, which allows the film to be advanced.) The first uses of the Geneva unit on film projectors date back to 1896 to the projectors of Oskar Messter and Max Gliewe and The Theatergraph of Robert William Paul. Earlier projectors, including the Thomas Armat projector, marketed by Edison as the Vitascope, had used a "beating mechanism", invented by Georges Demenÿ in 1893, to achieve intermittent film transport.

Wheeled wheels having the shape of the driven wheel were also used in mechanical clocks, but not in a drive, but in order to limit the tension of the spring, so that it would operate only in the interval in which its elastic force is almost linear. If one of the slots of the driven wheel is occluded, the number of rotations that the drive wheel can make is limited. In clocks, the "driving" wheel is the one that coils the spring, and the Geneva wheel with four or five spokes and a closed groove prevents softening (and also complete unwinding) of the spring. This so-called Geneva stop or "Geneva stop work" was the invention of watchmakers of the seventeenth or eighteenth centuries.

Other applications of the Geneva unit include the pen change mechanism in plotters, automated sampling devices, banknote counting machines and many forms of indexable equipment used in manufacturing (such as tool changers on CNC machines, Tower lathes, and turret drills, some types of indexing heads and rotary tables, and so on). The iron ring watch uses a Geneva mechanism to provide intermittent movement to one of its rings.
 
Reply

Important Note..!

If you are not satisfied with above reply ,..Please

ASK HERE

So that we will collect data for you and will made reply to the request....OR try below "QUICK REPLY" box to add a reply to this page
Popular Searches: geneva conveyor project report, geneva mechannism ppt, ppt of geneva mechanism, ppt on project of geneva mechanism, geneva mechanism conveyor ppt download, project report on geneva mechanism, mini project on geneva mechanism,

[-]
Quick Reply
Message
Type your reply to this message here.

Image Verification
Please enter the text contained within the image into the text box below it. This process is used to prevent automated spam bots.
Image Verification
(case insensitive)

Possibly Related Threads...
Thread Author Replies Views Last Post
  online mobile recharge project ppt 0 890 02-10-2018, 02:24 PM
Last Post: Guest
  mini project report on scotch yoke mechanism pdf 1 799 19-09-2018, 03:01 PM
Last Post: Guest
  shares and dividend maths project icse ppt 0 816 20-08-2018, 12:59 PM
Last Post: Guest
  air compressor using crank and slotted link mechanism pdf 1 819 08-08-2018, 04:00 PM
Last Post: Guest
  fabrication of pneumatic quick return mechanism in pdf 0 670 06-08-2018, 04:09 PM
Last Post: Guest
  online crime investigation system project ppt 0 743 21-07-2018, 02:44 PM
Last Post: Guest
  advantages and disadvantages of crank and slider mechanism 0 1,579 05-06-2018, 06:45 PM
Last Post: Guest
  working principle of box transport mechanism 0 625 25-05-2018, 11:31 AM
Last Post: Guest
  ppt on news portal project 0 678 19-05-2018, 06:01 PM
Last Post: Guest
  microprocessor based lift overload preventer project ppt 0 529 14-05-2018, 05:21 PM
Last Post: Guest

Forum Jump: