| 摘要 |
A vertical stack of envelopes is produced adjacent the infeed end of a printing press, for removal one at a time by envelope infeed mechanism of the printing press, the stack being maintained by adding envelopes one at a time to the bottom end of the stack when the height of the stack or number of envelopes in the stack is reduced to a predetermined magnitude, the rear end of the stack being elevated to facilitate insertion of added envelopes to the bottom of the stack. The envelopes are removed one at a time by operation of the envelope infeed mechanism of the printing press. The addition of envelopes to the stack is stopped when the height of the stack or number of envelopes in the stack is increased to a predetermined magnitude.
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