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WO1998010900B1 - Automated screw driving device - Google Patents

Automated screw driving device

Info

Publication number
WO1998010900B1
WO1998010900B1 PCT/CA1997/000649 CA9700649W WO9810900B1 WO 1998010900 B1 WO1998010900 B1 WO 1998010900B1 CA 9700649 W CA9700649 W CA 9700649W WO 9810900 B1 WO9810900 B1 WO 9810900B1
Authority
WO
WIPO (PCT)
Prior art keywords
screw
screws
torque
controlling
control mechanism
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CA1997/000649
Other languages
French (fr)
Other versions
WO1998010900A2 (en
WO1998010900A3 (en
Filing date
Publication date
Priority claimed from US08/717,603 external-priority patent/US5890405A/en
Application filed filed Critical
Priority to AU41951/97A priority Critical patent/AU4195197A/en
Publication of WO1998010900A2 publication Critical patent/WO1998010900A2/en
Publication of WO1998010900A3 publication Critical patent/WO1998010900A3/en
Publication of WO1998010900B1 publication Critical patent/WO1998010900B1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Abstract

A fully automated handheld screw driving device (D) comprises an automatic feeding mechanism of screws (15) to the screwdriver bit (7) from an integral storage magazine (26), an automatic speed control mechanism for controlling the rotary speed of the screwdriver, an automatic force control mechanism for controlling the seating force of the screwdriver bit on the screw, an adjustable depth control mechanism for controlling the final screw depth in the work surface, and an adjustable seating torque control mechanism for controlling the final screw head seating torque. The screws (15) are spirally wound on a replaceable bobbin (48) removably mounted in the magazine (26). The device (D) can accommodate a full range of practical screw sizes and can be fitted with exchangeable bits (7) for use with screws having standard recessed star or square heads and various bolt heads. A central microprocessor (28) is used to control all operating functions of the screw driving device (D). Control of seating torque is achieved by directly measuring armature voltage, field current and armature current. The machine dynamic behavior is used to determine a proportionality coefficient between torque and the product of field and armature currents. The proportionality coefficient is recalculated for every operating cycle of the device to continuously compensate for the effect of temperature on the magnetic characteristics of the motor. Rotary speed and torque of the two motors used in the device are tightly controlled using feedback techniques.

Claims

AMENDED CLAIMS
[received by the International Bureau on 15 July 1998 (15.07.98); new claims 21-24 added; remaining claims unchanged (1 page)]
21. A replaceable bobbin as defined in Claim 18, wherein said carrier tape means is made of a thin elongated band defining openings for receiving the screws, said band having continuously flat opposed surfaces .
22. A replaceable bobbin as defined in Claims 18 and 21, wherein said screw heads and said carrier tape means both abut said flange means.
23. A screw driving device as defined in Claim 19, wherein said screw carrier tape means is made of a thin elongated band defining openings for receiving the screws, said band having continuously flat opposed surfaces.
24. A screw driving device as defined in Claims 19 and 23, wherein said screws comprise screw heads and are attached to said screw carrier tape means at said screw heads such that upper surfaces of said screw heads are substantially coplanar with said screw carrier tape means.
PCT/CA1997/000649 1996-09-11 1997-09-05 Automated screw driving device Ceased WO1998010900A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU41951/97A AU4195197A (en) 1996-09-11 1997-09-05 Automated screw driving device

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US2572696P 1996-09-11 1996-09-11
US60/025,726 1996-09-11
US08/717,603 US5890405A (en) 1996-09-11 1996-09-23 Automated screw driving device
US08/717,603 1996-09-23

Publications (3)

Publication Number Publication Date
WO1998010900A2 WO1998010900A2 (en) 1998-03-19
WO1998010900A3 WO1998010900A3 (en) 1998-07-23
WO1998010900B1 true WO1998010900B1 (en) 1998-09-11

Family

ID=26700093

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA1997/000649 Ceased WO1998010900A2 (en) 1996-09-11 1997-09-05 Automated screw driving device

Country Status (3)

Country Link
US (1) US5890405A (en)
AU (1) AU4195197A (en)
WO (1) WO1998010900A2 (en)

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