Spacer for abrasive roll of abrasive type grain milling machine

An abrasive type vertical grain milling machine comprising:

• an abrasive type grain milling roll assembly mounted on a main shaft extending straight in a vertical direction and having a plurality of roll elements fitted on said main shaft while being spaced by means of a spacer from each other in a main shaft-extending direction in which said main shaft extends;
• and
• a perforated cylindrical body extending vertically around said roll assembly leaving a space therefrom so as to define a cylindrical grain milling chamber around said roll assembly in cooperation with an outer peripheral surface of said roll assembly and having a large number of holes through which bran produced in said grain milling chamber is allowed to be released,
• grains to be milled being introduced into the grain milling chamber from a vertical one end of the grain milling chamber and grain having been milled being discharged from another vertical end of the same,
• wherein each said spacer comprises a boss portion fitted on the main shaft and a plurality of arm portions extending from said boss portion radially outwardly and serving to induce bran removing air into the grain milling chamber through spaces between the circumferentially adjacent arm portions.