Screw guide structure in screwdriver for connecting screws

Abstract

A screw guide structure of a screw feeding mechanism of a screw driver (10) is provided. The screw feeding mechanism is configured to sequentially feed collated screws (50) to a driving position. The collated screws (50) are plurality of screws (51) connected by a connecting band (52). The screw guide structure includes a base part (24), a nose member (30) provided on a distal end of the base part (24) in a slidable manner, and a straight-driving guide member (41) supported by the nose member (30) in a displaceable manner so as to guide a screw (51) fed by the screw feeding mechanism to be in a straight posture. The straight-driving guide member (41) has a concave guide groove (41b) configured to guide a shaft (51a) of the screw (51). The straight-driving guide member (41) is configured and arranged such that the shaft (51a) of the screw (51) is engaged into the guide groove (41b) when the screw (51) is fed by the screw feeding mechanism, and such that the straight-driving guide member (41) is displaced when a head (51b) of the screw (51) passes by driving the screw (51) engaged into the guide groove (41b).

Description

technical field [0001] The present invention relates to a guide structure for vertically guiding screws in a screwdriver having a screw feeding mechanism that sequentially feeds connecting screws formed by connecting a plurality of screws with a connecting belt to a driving position. Background technique [0002] In a generally used screwdriver for connecting screws, the head is pushed in by pressing the head against the workpiece to be driven, and the feeding operation of the connecting screw and the driving operation of the connecting screw are performed in conjunction with this operation. As such a screwdriver, JP2008-119789A discloses a screw fall prevention mechanism that prevents the screw from falling. The screw tipping prevention mechanism has a pair of tilting members, and guides the screw vertically relative to the driving member by passing the screw through a hole formed between the pair of tilting members, thereby preventing the screw from tipping over. [0003]...

AI Technical Summary

Problems solved by technology

[0003] However, in this screwdriver for connecting screws, when the head is pressed against the workpiece to be driven, the speed of the pressing device increases and the speed of screw feeding also increases. Therefore, the connecting screw being conveyed may exceed the specified position due to inertia, and the conveying action of the connecting screw may be defective.

When the driving operation is performed in this state, the axis of the screwdriver bit and the axis of the screw will be misaligned, so the screw will be driven in an oblique manner, and the front end of the screwdriver bit will not be aligned with the screw hole, causing the screw to deviate.

[0004] In addition, the screw tipping prevention mechanism disclosed in JP2008-119789A cannot solve the above-mentioned problems

That is, the screw tipping prevention mechanism of JP2008-119789A does not guide the posture of the screw before driving, so the problem of excessive delivery of the connecting screw cannot be avoided

When the driving action is performed directly under the condition that the excessively conveyed screw becomes inclined, the following problem will arise: the screw does not enter between a pair of tilting parts, but enters one side of the tilting part, and does not pass through the screw formed in the tilting part. If the hole in the center guides the posture and is punched obliquely, the protrusion will deviate

However, in the case of a box-shaped screw tipping prevention mechanism, it is difficult to confirm the driving position, and it is complicated to remove the screw when the screw is clogged.

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