| 摘要 |
In a pneumatically operable strapping tool, a tension lever is provided for controlling an internal pneumatic or air control valve which, in turn, controls an air motor drive operatively connected to a feedwheel which tensions the strapping material, disposed about an article or package to be strapped, to a predetermined tension level. A seal lever is provided in conjunction with the tension lever such that upon completion of the tensioning phase of the strapping operation, the seal lever may be actuated so as to initiate the sealing phase of the strapping operation. In order to prevent a partial loss or a reduction of the tension level within the strapping which normally occurs during the transition between the tensioning and sealing phases of the strapping operation, the seal lever is provided with a tang, tab, or ear member which physically encounters or engages the tension lever so as to maintain the tension lever at its operative or active position during the sealing phase of the strapping operation. In this manner, the tensioning phase of the strapping operation is not prematurely terminated and termination of the tensioning phase of the strapping operation is effectively delayed until the sealing phase of the strapping operation has been completed. Therefore, a proper tension level within the sealed strapping is achieved.
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