In horology, a wheel train (or just train) is the gear train of a mechanical watch or clock. Although the term is used for other types of gear trains, the long history of mechanical timepieces has created a traditional terminology for their gear trains which is not used in other applications of gears.
Watch movements are very standardized, and the wheel trains of most watches have the same parts. The wheel trains of clocks are a little more varied, with different numbers of wheels depending on the type of clock and how many hours the clock runs between windings (the "going"). However, the wheel trains of clocks and watches share the same terminology, and are similar enough that they can be described together. The large gears in timepieces are generally called wheels, the smaller gears they mesh with (large to small, large to small) are called pinions, and the shafts that the wheels and pinions are mounted on are called arbors. The wheels are mounted between the plates of the movement, with the pivots rotating in holes in the plates. The pivot holes have semicircular depressions around them, called oil cups, to hold the oil in contact with the shaft by capillary action. There are several wheel trains in a typical clock or watch:
The going train is the main gear train of the timepiece. It consists of the wheels that transmit the force of the timepiece's power source, the mainspring or weight, to the escapement to drive the pendulum or balance wheel. The going train has two functions. First, it scales up the speed of rotation of the mainspring or weight pulley. This allows the use of a very strong, slow turning mainspring or heavy weight that will run the timepiece for days or weeks. Second, its gear ratios divide the rotation of the escape wheel into convenient time units of seconds, minutes, and hours, to turn the timepiece's hands. The going train wheels are the only ones under load in a timepiece, since they bear the constant torque of the mainspring which is applied to the escapement, so these wheels are the only ones that receive significant wear. In watches and some high quality clocks their arbors have jewel bearings. The going train in a modern clock or watch consists of:
The motion work is the small 12-to-1 reduction gear train that turns the timepiece's hour hand from the minute hand. It is attached to the going train by the friction coupling of the cannon pinion, so the minute and hour hands can be turned independently to set the timepiece. It is often located on the outside of the movement's front plate, just under the dial. It consists of:
Used in watches, the keyless work are the gears that wind the mainspring when the crown is turned, and when the crown is pulled out allow the hands to be set. The term originated because, before the modern form of keyless work was invented by Adrien Philippe in 1843, watches were wound and set by inserting a separate key into holes in the back and turning it. The core of the keyless mechanism is a gear on the watch's winding stem, the clutch (or castle wheel in Britain), with two sets of axial gear teeth on it, which slides in and out. When the stem is pushed in, a lever slides the clutch out, and the outer set of teeth engages a small wheel train which turns the mainspring arbor, winding the mainspring. When the stem is pulled out, the clutch slides in, and the inner teeth engage another wheel, which turns the hour wheel in the motion work, turning the watch's hands.
In striking clocks, the striking train is a gear train that moves a hammer to strike the hours on a gong. It is usually driven by a separate but identical power source to the going train. In antique clocks, to save costs, it was often identical to the going train, and mounted parallel to it on the left side when facing the front of the clock.
|
|||||||||||||||||||||||||
HOT DESIGNS ▪ Premium designs ▪ Designs by country ▪ Designs by U.S. state ▪ Most popular designs ▪ Newest, last added designs ▪ Unique designs ▪ Cheap, budget designs ▪ Design super sale DESIGNS BY THEME ▪ Accounting, audit designs ▪ Adult, sex designs ▪ African designs ▪ American, U.S. designs ▪ Animals, birds, pets designs ▪ Agricultural, farming designs ▪ Architecture, building designs ▪ Army, navy, military designs ▪ Audio & video designs ▪ Automobiles, car designs ▪ Books, e-book designs ▪ Beauty salon, SPA designs ▪ Black, dark designs ▪ Business, corporate designs ▪ Charity, donation designs ▪ Cinema, movie, film designs ▪ Computer, hardware designs ▪ Celebrity, star fan designs ▪ Children, family designs ▪ Christmas, New Year's designs ▪ Green, St. Patrick designs ▪ Dating, matchmaking designs ▪ Design studio, creative designs ▪ Educational, student designs ▪ Electronics designs ▪ Entertainment, fun designs ▪ Fashion, wear designs ▪ Finance, financial designs ▪ Fishing & hunting designs ▪ Flowers, floral shop designs ▪ Food, nutrition designs ▪ Football, soccer designs ▪ Gambling, casino designs ▪ Games, gaming designs ▪ Gifts, gift designs ▪ Halloween, carnival designs ▪ Hotel, resort designs ▪ Industry, industrial designs ▪ Insurance, insurer designs ▪ Interior, furniture designs ▪ International designs ▪ Internet technology designs ▪ Jewelry, jewellery designs ▪ Job & employment designs ▪ Landscaping, garden designs ▪ Law, juridical, legal designs ▪ Love, romantic designs ▪ Marketing designs ▪ Media, radio, TV designs ▪ Medicine, health care designs ▪ Mortgage, loan designs ▪ Music, musical designs ▪ Night club, dancing designs ▪ Photography, photo designs ▪ Personal, individual designs ▪ Politics, political designs ▪ Real estate, realty designs ▪ Religious, church designs ▪ Restaurant, cafe designs ▪ Retirement, pension designs ▪ Science, scientific designs ▪ Sea, ocean, river designs ▪ Security, protection designs ▪ Social, cultural designs ▪ Spirit, meditational designs ▪ Software designs ▪ Sports, sporting designs ▪ Telecommunication designs ▪ Travel, vacation designs ▪ Transport, logistic designs ▪ Web hosting designs ▪ Wedding, marriage designs ▪ White, light designs E-COMMERCE DESIGNS ▪ Magento store designs ▪ OpenCart store designs ▪ PrestaShop store designs ▪ CRE Loaded store designs ▪ Jigoshop store designs ▪ VirtueMart store designs ▪ osCommerce store designs ▪ Zen Cart store designs CMS DESIGNS ▪ Flash CMS designs ▪ Joomla CMS designs ▪ Mambo CMS designs ▪ Drupal CMS designs ▪ WordPress blog designs ▪ Forum designs ▪ phpBB forum designs ▪ PHP-Nuke portal designs ANIMATED WEBSITE DESIGNS ▪ Flash CMS designs ▪ Silverlight animated designs ▪ Silverlight intro designs ▪ Flash animated designs ▪ Flash intro designs ▪ XML Flash designs ▪ Flash 8 animated designs ▪ Dynamic Flash designs ▪ Flash animated photo albums ▪ Dynamic Swish designs ▪ Swish animated designs ▪ jQuery animated designs WEBSITE DESIGNS ▪ WebMatrix Razor designs ▪ HTML 5 designs ▪ Web 2.0 designs ▪ 3-color variation designs ▪ 3D, three-dimensional designs ▪ Artwork, illustrated designs ▪ Clean, simple designs ▪ CSS based website designs ▪ Full design packages ▪ Full ready websites ▪ Portal designs ▪ Stretched, full screen designs ▪ Universal, neutral designs CORPORATE ID DESIGNS ▪ Corporate identity sets ▪ Logo layouts, logo designs ▪ Logotype sets, logo packs ▪ PowerPoint, PTT designs ▪ Facebook themes VIDEO, SOUND & MUSIC ▪ Video e-cards ▪ After Effects video intros ▪ Special video effects ▪ Music tracks, music loops ▪ Stock music bank GRAPHICS & CLIPART ▪ Pro clipart & illustrations, $19/year ▪ 5,000+ icons by subscription ▪ Icons, pictograms |
| Super Offers |
| Super Offers |
| Custom Logo Design $149 ▪ Web Programming ▪ ID Card Printing ▪ Best Web Hosting ▪ eCommerce Software ▪ Add Your Link |
| © 1996-2013 MAGIA Internet Studio ▪ About ▪ Portfolio ▪ Photo on Demand ▪ Hosting ▪ Advertise ▪ Sitemap ▪ Privacy ▪ Maria Online
|
