| 摘要 |
<p>An implement is provided for opening envelopes in which a ram (28) is reciprocally mounted within a hollow sleeve (14). A transverse envelope receiving crevice or slot (22) is defined at one end of the sleeve (14) and the ram (28) carries a blade (32) which has a cutting edge (34) directed toward the envelope receiving slot. A spring (38) acts between the sleeve and the ram to urge the cutting edge of the blade away from the transverse slot so that the blade is not exposed unless the spring bias is overcome. Alternatively, a blade (120) is disposed within a body (114). A guide within the body (114) limits movement of the blade (120) to a linear path between a position wherein the cutting edge projects into the crevice (118) in the direction of the width thereof and a position wherein the cutting edge is withdrawn from the crevice (118). A dial (184) is eccentrically mounted on the body (114) in the path of movement of a slide (124) and is rotatable to adjustably limit the extend of projection of the cutting edge (122) of the blade (120) into the crevice (18). The dial prevents the blade from spanning the crevice entirely.</p> |
