Abstract: In a device for feeding articles, cylindrical feed screws having left and right hand pitched helical grooves are arranged in parallel and are driven rotationally in opposite directions such that an article deposited in the space between the roots of the grooves at one corresponding end of the grooves will be advanced axially to the opposite ends for exiting from between the feed screws.

Abstract: A plurality of containers on which untightened threaded caps are deposited are transported in a circular path synchronously with a cap tightening device for each container. The devices have a substantial vertical reciprocable non-rotatable shaft on which a cylindrical member is rotatable and a cylindrical housing is mounted to and is axially adjustable on the member. A spool of magnetic metal is rotatable on the shaft and is adapted for engaging a cap to turn and tighten it. Magnetizable and magnetized elements are arranged with the housing concentrically to the spool. While being transported the housings of the devices engage a stationary driver which turns the housings consecutively so the spools turn by virtue of magnetic coupling between the magnetic elements and the spool.