Elongated-member-driving apparatus – With means to move or guide member into driving position – With means to assure correct orientation of member
Reexamination Certificate
2001-01-30
2001-10-02
Smith, Scott A. (Department: 3721)
Elongated-member-driving apparatus
With means to move or guide member into driving position
With means to assure correct orientation of member
C227S120000, C227S136000, C081S057370, C081S434000
Reexamination Certificate
active
06296166
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a stapler, and more particularly to a stapler having a belt feeding device for precisely feeding the belt and the nails or fasteners step by step.
2. Description of the Prior Art
Various kinds of typical staplers have been developed and comprise a belt feeding device for actuating or feeding the belt and the fasteners or screws step by step or one by one. However, the belt feeding device normally includes a spring biased pawl or pusher for engaging with and for pushing the belt and thus the fasteners forward step by step. However, the belt and the fasteners are normally loosely retained in the stapler and may not be precisely pushed forward by the spring biased pawl.
The present invention has arisen to mitigate and/or obviate the afore-described disadvantages of the conventional staplers.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a stapler including a belt feeding device for precisely feeding the belt and the nails or fasteners step by step.
In accordance with one aspect of the invention, there is provided a belt feeding device for feeding a belt of a stapler, the belt feeding device comprising a housing, a casing slidably engaged in the housing and movable inward and outward of the housing, the casing including a guide passage formed therein for receiving the belt, a shaft rotatably received in the casing, a rotary member unidirectionally secured on the shaft and to be rotated in an active direction by the shaft and to be rotated freely relative to the shaft in a reverse direction, the rotary member including an outer peripheral portion having a plurality of projections extended outward therefrom for engaging with and for feeding the belt, means for rotating the shaft relative to the casing to rotate the rotary member relative to the casing step by step when the casing moves inward and outward of the housing, and means for positioning the rotary member to the casing when the rotary member rotates relative to the casing step by step.
The positioning means includes a block secured to and rotated in concert with the rotary member, the block includes an outer peripheral portion having a plurality of recesses formed therein, and spring biasing means for engaging with the recesses of the block to position the rotary member to the casing.
The spring biasing means includes a spring secured to the casing and having a spring end engaged in the recesses of the block.
The rotary member includes two plates each having an outer peripheral portion and each having the projections extended outward from the outer peripheral portion thereof for engaging with and for feeding the belt.
The casing includes an orifice formed therein for receiving the shaft, and includes a curved groove formed therein and having a center of curvature located at the orifice of the casing, the housing includes a guide channel formed therein, the rotating means includes a rod secured to and rotated in concert with the shaft and slidably engaged in the curved groove of the casing and the guide channel of the housing for allowing the rod to be moved along the curved groove of the casing when the casing moves inward of the housing.
The rotating means includes an arm having a first end secured to the shaft and having a second end secured to the rod.
The housing includes at least one guide slot formed therein, the casing includes at least one protrusion extended therefrom and slidably received in the guide slot of the housing to guide the casing to move relative to the housing.
Further objectives and advantages of the present invention will become apparent from a careful reading of a detailed description provided hereinbelow, with appropriate reference to accompanying drawings.
REFERENCES:
patent: 3891014 (1975-06-01), Gunn
patent: 4404877 (1983-09-01), Mizuno et al.
patent: 5101697 (1992-04-01), Fishback
patent: 5284074 (1994-02-01), Chen
patent: 5402695 (1995-04-01), Hornung
patent: 5671645 (1997-09-01), Murayama et al.
patent: 6073523 (2000-06-01), Shinjo
patent: 6227429 (2001-05-01), Huang
Baxley Charles E.
Smith Scott A.
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