Screw Feeding Unit with Rotatable Guide for Flat Head Screws
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Solution Overview
Problem
Conventional continuous screw fastening devices face difficulties in precisely pulling screws with flat head portions from screw strips and struggle with bit replacement, especially when using hexagonal bits due to deformation and wastage of screws and bits.
Innovation Solution
A screw feeding/fastening unit with a screw strip guide, a feeder unit, and a slide frame that includes a turnable feed lever and a screw strip binding piece unbinding mechanism, allowing for orthogonal rotation of the screw strip guide and facilitating bit replacement by a detachable sleeve release mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional screw feeding mechanisms are used, then simple structure is maintained, but screws with flat head portions cannot be precisely pulled from screw strips
Solution Approach 1:
The screw strip guide unit is configured to be rotatable around a shaft body, transforming from a static to a dynamic structure. During screw fastening, the guide unit rotates to impart unbinding force to the screw strip binding piece, enabling precise pulling of screws with flat head portions without requiring complex additional mechanisms
Solution Approach 2:
The screw strip guide unit utilizes the rotational motion generated during normal fastening operation to automatically pull the screw strip. The turning receiver receives turning force from the slide frame's sliding motion, which then rotates the guide unit to unbind the screw, making the system self-servicing without external intervention
2Manufacturing precision
If screw strip lifting structure is added, then screw pulling is improved, but screw strip cannot be removed from last coupled screw
Solution Approach 1:
The rotatable screw strip guide unit ensures continuous operation by enabling the screw strip to be pulled even from the last coupled screw. The rotational mechanism maintains unbinding force throughout the entire fastening process, preventing interruption and ensuring the screw strip can be completely removed without leaving residual bindings
3Strength
If hexagonal bit with large diameter is used, then fastening capability is improved, but bit replacement becomes troublesome
Solution Approach 1:
The bit system is segmented into replaceable components. The bit can be detached from the driver through a release mechanism, allowing easy replacement of large-diameter hexagonal bits without requiring removal of the entire fastening unit or complex manipulation
Solution Approach 2:
A release mechanism acts as an intermediary between the operator and the bit. By actuating the release mechanism, the bit can be easily removed and replaced, simplifying the operation of changing large-diameter hexagonal bits while maintaining fastening capability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise pulling of screws with flat head portions from screw strips and simplifies bit replacement, ensuring efficient screw fastening and reducing wastage, even with hexagonal bits.
Implementation Method 1
to be restorable to its original position by a spring
Implementation Method 2
supports the screw strip guide unit to be rotatable in a direction orthogonal to a longitudinal direction of the bit by a shaft body
Data Source
AI summary
The present invention provides a screw feeding/fastening unit of a continuous screw fastening device which enables assuredly pulling screws out of a screw strip in tandem with a screw fastening operation even in case of using the screws each of which has, e.g., a flat shape below its head portion.A screw feeding/fastening device of a continuous screw fastening device according to the present invention is a screw feeding/fastening unit 1 of a continuous screw fastening device which fastens screws 4, and it is configured to include a screw strip binding piece unbinding section 51 which supports a screw strip guide unit 2 to be rotatable in a direction orthogonal to a longitudinal direction of a bit by a shaft body 53 provided at a position before a feed case 22 in a feeder unit 21 and to be restorable to its original position by a spring 54, has on the screw strip guide unit a turning receiver 6 which abuts on a part of a slide frame and receives turning force at the time of a slide operation of the slide frame 31 toward the screw strip guide unit, and turns the screw strip guide unit together with the turning receiver around the shaft body as a spindle in a direction along which a tip side gets away from a screw at the fastening acting position to impart unbinding force to a screw strip binding piece 3a at the time of fastening the screw.