| 摘要 |
A downwardly open ink receptacle, surrounded by a cylindrical masking screen, has a downwardly convex bottom member of elastic material forming a discharge slot for the ink, this slot being spanned by one or more substantially inextensible reinforcing elements leaving clearances in line with the slot in order to give passage to the ink. The slot may be bounded by a pair of low-friction strips bearing directly upon the inner screen surface under pressure of a pair of weighting bars flanking the slot. The reinforcement can be a perforated foil, an insert with an undulating wire, or a series of axially spaced bolts.
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