Screw driving method and screw driving apparatus

Details Screw driving method and screw driving apparatus Screw driving method and screw driving apparatus

B - Operations, Transporting

25

B

B25B 21/00 (2006.01) B25B 21/02 (2006.01) B25B 23/04 (2006.01)

Patent

CA 2217685

When a screw 14 is driven into workpieces 61 and 62, it is possible to reduce any reaction that a driver bit 11 is raised so as to obtain fast and reliable screw driving. In the screw driving method of the present invention, the screw is advanced with a strong pressing force of 7-10 Kg during a period from disengagement step of the screw from a carrier strip 14 to driving step of the tip of the screw to the predetermined depth (the lower surface) of the workpiece 61. When the screw is screwed into the workpiece 62, the driver bit 11 is advanced with a weak pressing force of 2-3 Kg. In a screw driving apparatus of the present invention, the fitted screw is disengaged from a screw carrier strip by means of a forward stroke force of the driver bit. The tip of the screw is driven to a predetermined depth in a workpiece. During the term between the disengagement and the driving of the screw, the driver bit is advised with a strong pressing force by a primary piston 26. Then, the screw 14 is screwed into the workpiece 62 by advancing the driver bit 11 with a weak pressing force by a secondary piston 27 which passing through the center of the primary piston 26. The driver bit 11 is rotated by an air motor 31. 19

Quand une vis (14) est vissée dans un matériau (61, 62), la réaction du mandrin (11) de vissage dans la direction ascendante est diminuée pour permettre un vissage rapide et fiable. Dans un procédé de vissage de vis, une force de pression élevée d'environ 7 à 10 kg est utilisée pour désengager la vis (14) d'une bande de raccordement (13) et visser la vis dans le matériau jusqu'à ce qu'elle atteigne une profondeur prédéterminée (face intérieure du matériau 61) et une petite force de pression d'environ 2 à 3 kg est utilisée pour visser la vis (14) dans le matériau (62) par rotation. Dans un outil (1) de vissage, une extrémité du mandrin de vissage (11) est placée dans une rainure de la tête de vis (14) et le mandrin (11) de vissage est avancé pour désengager la vis positionnée (14) de la bande de raccord (13). Pendant que l'extrémité de la vis est vissée jusqu'à une certaine profondeur dans le matériau (61), un piston principal (26) avance le mandrin (11) de vissage avec une force de pression plus élevée pour visser la vis (14) jusqu'à une profondeur prédéterminée dans le matériau (61). Ensuite, pour enfoncer la vis dans le matériau (62), un sous-piston (27) traversant concentriquement le piston principal (26) avance le mandrin de vissage (11) avec une force de pression faible. Le mandrin (11) de vissage est mis en rotation par un moteur à air comprimé (31).

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