| 摘要 |
<p>A breech for the gun of a microballistic printer comprising a plurality of metal spheres positioned on the inside periphery of a cup, forming a central opening slightly smaller than the spherical projectiles used in the microballistic printer. The spheres are held in spaced relation by a projectile which is adapted to be sequentially replaced by another projectile during the operation of the microballistic printer. The spheres forming the central opening through which the projectiles pass are sealed with a sealing compound to prevent the loss of gaseous pressure which is built up behind the projectile and which propels it toward the printing surface.</p> |
