Automatic opening and closing device for a window

Claim 2

An automatic opening and closing device for a window comprising: a forwardly and reversely rotatable motor for opening and closing a window; and control circuit means connected to said motor and including: switching means for instructing said motor to rotate; pulse-detecting means for detecting a pulse generated by the rotation of said motor; counting means for counting pulses detected by said pulse-detecting means and for resetting a count number to a predetermined count number according to a prescribed signal; holding means for holding the rotation of said motor according to a signal output from said switching means; and holding-cancel signal generating means for detecting a count number counted by said counting means and for cancelling a holding state of said holding means by generating a holding-cancel signal when the count number reaches a predetermined reference value during an opening operation of the window; wherein said holding-cancel signal generating means comprises: a reference value-setting circuit for setting said predetermined reference value corresponding to a car speed; and a holding-cancel signal generating circuit for comparing the count number counted by said counting means with said predetermined reference value and for outputting said holding-cancel signal when the count number reaches said predetermined reference value corresponding to said car speed.

Claim 3

An automatic opening and closing device for a window according to claim 1, wherein said counting means comprises: an initial value-setting circuit for resetting a count number to said predetermined count number according to said prescribed signal generated when the frequency of the pulse detected by the pulse-detecting means is less than a predetermine frequency; and a counter to count a pulse-number detected by the pulse-detecting means.

Claim 4

An automatic opening and closing device for a window comprising: a forwardly and reversely rotatable motor for opening and closing a window; and control circuit means connected to said motor and including: switching means for instructing said motor to rotate; pulse-detecting means for detecting a pulse generated by rotation of said motor; counting means for counting a pulse-number detected by said pulse-detecting means; window position-detecting means for detecting whether or not said window is near to a closed position on the basis of a count number outputted from said counting means; speed operation means for calculating a rotational speed of said motor on the basis of the pulse detected by said pulse-detecting means; speed change operation means for calculating a rate of rotational speed change against a previously measured value of said motor on the basis of an output signal of said speed operation means; window action-detecting means to detect whether said window is in a closing action; reversing instructive signal generating means for reversing said motor for opening said window if an output signal from said speed change operation means exceeds a predetermined first set point when said window action-detecting means detects said window to be in said closing action and said window position-detecting means detects said window to be not near to the closed position; and stop instructive signal generating means for stopping said motor if the output from said speed change operation means exceeds a predetermined second set point when said window action-detecting means detects said window to be in said closing action and said window position-detecting means detects said window to be near to the close position.

Claim 5

An automatic opening and closing device for a window comprising: a forwardly and reversely rotatable motor for opening and closing a window; and control circuit means connected to said motor and including: switching means for instructing said motor to rotate; pulse-detecting means for detecting a pulse generated by rotation of said motor; counting means for counting a pulse-number detected by said pulse-detecting means; window position-detecting means for detecting whether or not said window is near to a closed position on the basis of a count number outputted from said counting means; speed operation means for calculating a rotational speed of said motor on the basis of the pulse detected by said pulse-detecting means; speed change operation means for calculating a rate of rotational speed change against a previously measured value of said motor on the basis of an output signal of said speed operation means; window action-detecting means to detect whether said window is in a closing action; reversing instructive signal generating means for reversing said motor for opening said window if an output signal from said speed change operation means exceeds a predetermined first set point when said window action-detecting means detects said window to be in said closing action and said window position-detecting means detects said window to be not near to the closed position; and stop instructive signal generating means for stopping said motor if the output from said speed change operation means exceeds a predetermined second set point when said window action-detecting means detects said window to be in said closing action and said window position-detecting means detects said window to be near to the close position.

Claim 6

An automatic opening and closing device for a window according to claim 3, wherein said predetermined second set point is larger than said predetermined first set point.

Claim 7

An automatic opening and closing device for a window according to claim 4, further including resetting means for resetting said count number when the window arrives in the entirely closed position and the fully opened position.