Patent Application
20120063563
1. Technical Field
The disclosed embodiments relate to screw counters, and more particularly to a screw counter and an electronic device using the same.
2. Description of Related Art
A screwdriver is widely used for screwing a plurality of screws into a workpiece, for example a casing of electronic devices, such as computers, televisions, etc., during assemble of the electronic devices. However, it is difficult and not precise for an operator to manually determine whether the screw is completely screwed into a workpiece and to know a total number of screws which are completely screwed into the workpiece.
What is needed, therefore, is a screw counter and an electronic device to overcome the above described limitations.
Many aspects of the embodiments can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present embodiments. Moreover, in the drawings, like reference numerals designate corresponding parts throughout two views.
Referring to
A screwdriver 200 is connected to the first interface 10. The screwdriver 200 is adapted for screwing a predetermined total number of screws into a workpiece 300 to perform a screwing operation on the workpiece 300, when all of the screws are completely screwed into the workpiece 300, the screwing operation is completed. In this embodiment, the predetermined total number of screws can be one screw, two screws, or more than two screws.
The input unit 15 is used for receiving the predetermined total number input by users. In detail, the input unit 15 includes a first button S1, a second button S2, and a third button S3. The first button S1 is used for adding one to the predetermined total number when pressed, the second button S2 is used for subtracting one from the predetermined total number when pressed, the third button S3 is used to reset the predetermined total number when pressed.
The screwdriver 200 further generates a feedback signal when a screw is being screwed into the workpiece 300, and stops generating the feedback signal when the screw is completely screwed into the workpiece 300. In this embodiment, the screwdriver 200 is powered by a supply voltage from a power source (not shown), and the feedback signal is the supply voltage.
The first interface 10 is used for transmitting the feedback signal to the converting unit 20.
The converting unit 20 is used for converting the feedback signal to a signal suited for the processing unit 30. The converting unit 20 includes an optical coupler U1, the optical coupler U1 includes a first input terminal connected to the first interface 10, a second input terminal, a first output terminal connected to the processing unit 30, and a second output terminal. The second input terminal and the second output terminal are grounded.
The processing unit 30 is in a first state at which the processing unit 30 receives the converted feedback signal from the converting unit 20 when the screw is being screwed into the workpiece 300, and in a second state at which the processing unit 30 stops receiving the converted feedback signal when the screw is completely screwed into the workpiece 300. The first warning unit 32 outputs a first warning signal when the processing unit 30 is changed from the first state to the second state. Therefore, users know whether the screw is completely screwed into the workpiece 300. In other embodiments, the screw counter 100 does not include the converting unit 20, therefore the processing unit 30 directly receives the feedback signal from the screwdriver 200 through the first interface 10.
The detecting unit 400 is used for detecting a start time and a finish time of the screwing operation. In detail, the detecting unit 400 is mounted to a workbench 500 for detecting whether the workpiece 300 is placed on or removed from the workbench 500. When the workpiece 300 is placed on the workbench 500, the start time of the screw operation is determined. When the workpiece 300 is removed from the workbench 500, the finish time of the screw operation is determined.
The second interface 40 is connected to the detecting unit 400, and is used for transmitting the start time and the finish time to the processing unit 30.
The processing unit 30 is further used for counting a variable. An initial value of the variable is zero, each time when the processing unit 30 is changed from the first state at which the processing unit 30 receives the converted feedback signal from the converting unit 20 to the second state at which the processing unit 30 stops receiving the converted feedback signal, the variable adds one. A total added value of the variable is calculated during a time interval between the start time and the finish time to acquire a total number of screws which are completely screwed into the workpiece 300. The acquired total number of screws equals to the total added value of the variable. The screw counter 100 further includes a reset button (not shown), when the reset button is pressed, the value of the variable returns to zero.
The processing unit 30 further generates a control signal when the acquired total number of screws is not equivalent to the predetermined total number of screws, the second warning unit 60 outputs a second warning signal according to the control signal.
In this embodiment, the second warning unit 60 includes light emitting diode (LED) 62, the LED 62 emits light or flickers when the acquired total number of screws is not equivalent to the predetermined total number of screws. In other embodiments, the second warning unit 60 includes a speaker or a buzzer 64, the speaker or the buzzer 64 outputs an audible warning signal, for example voice warning signal, when the acquired total number of screws is not equivalent to the predetermined total number of screws. Therefore, users are informed that the acquired total number of screws is not equivalent to the predetermined total number of screws, the error is effectively prevented.
The display unit 80 includes a first display unit and a second display unit, the first display unit is used for displaying the predetermined total number of screws, and the second display unit is used for displaying the acquired total number of screws.
The memory 82 stores the predetermined total number of screws and the acquired total number of screws, therefore when the screw counter 100 is accidently powered off, the data loss is effectively prevented.
Alternative embodiments will become apparent to those skilled in the art without departing from the spirit and scope of what is claimed. Accordingly, the present invention should be deemed not to be limited to the above detailed description, but rather only by the claims that follow and equivalents thereof.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201010279653.X | Sep 2010 | CN | national |
