Phasing and syncronizing circuit means for use in facsimile systems or the like

Claim 2

A synchronizing system for synchronizing a periodically operable device with synchronizing electrical pulses of a predetermined first frequency comprising a motor for driving said device, means for generating electrical pulses at a frequency dependent on the speed of said motor, means for driving said motor at variable speeds, and means operable responsive to no time coincidence of said synchronizing and generated pulses for controlling said motor driving means to drive said motor at a quiescent speed at which said generated pulse frequency is slightly different than said predetermined frequency and operable responsive to a predetermined minimum of time coincidence of said synchronizing and generated pulses for controlling said motor driving means to sweep the speed of said motor through the speed at which generated pulses of said predetermined frequency are produced towards said quiescent speed between periods of said pulse time coincidence.

Claim 3

A synchronizing system for synchronizing a periodically operable device with synchronizing electrical pulses of a predetermined first frequency comprising a synchronous motor for driving said device, means for generating electrical pulses at a frequency dependent on the speed of said motor, a variable frequency oscillator for driving said motor, and means operable responsive to no time coincidence of said synchronizing and generated pulses for controlling said oscillator to drive said motor at a quiescent speed at which said generated pulse frequency is slightly different than said predetermined frequency and operable responsive to a predetermined minimum of time coincidence of said synchronizing and generated pulses for controlling said oscillator to sweep the speed of said motor through the speed at which generated pulses of said predetermined frequency are produced towards said quiescent speed between periods of said pulse time coincidence.

Claim 4

A synchronizing system for synchronizing a periodically operable device with synchronizing electrical pulses of a predetermined first frequency comprising a synchronous motor for driving said device, means for generating electrical pulses at a frequency dependent on the speed of said motor, a variable frequency oscillator for driving said motor, and means operable responsive to no time coincidence of said synchronizing and generated pulses for controlling said oscillator to drive said motor at a quiescent speed at which said generated pulse frequency is slightly different than said predetermined frequency and operable responsive to a predetermined minimum of time coincidence of said synchronizing and generated pulses for controlling said oscillator to sweep the speed of said motor through the speed at which generated pulses of said predetermined frequency are produced towards said quiescent speed between periods of said pulse time coincidence.

Claim 5

The synchronizing system of claim 1 wherein said motor driving means operates responsive to variations in a DC voltage level, and wherein said controlling means comprises means for developing a quiescent voltage level at its output with no pulse time coincidence, for changing its voltage level output during pulse time coincidence in the direction of a voltage level corresponding to said first frequency an amount determined by the amount of pulse time coincidence, and for sweeping said voltage level back toward said quiescent voltage level after each pulse coincidence.

Claim 6

The synchronizing system of claim 3 in which said controlling means comprises an And gate in receipt of said synchronizing and generated pulses to determine the amount of pulse time coincidence.

Claim 7

The synchronizing system of claim 3 wherein said voltage developing, changing and sweeping means comprises a first capacitor chargeable during pulse coincidence to a peak voltage level determined by the amount of pulse coincidence, means for discharging said capacitor after pulse coincidence rapidly with respeCt to the period of said synchronizing pulses, another capacitor, means for charging said other capacitor to a peak voltage determined by the peak voltage of said first capacitor during pulse coincidence, means including at least one resistor for discharging said other capacitor slowly with respect to the period of said synchronizing pulses, and means for providing the voltage level output of said controlling means in accordance with the voltage on said other capacitor.

Claim 8

The synchronizing system of claim 5 wherein said controlling means comprises in addition servo stabilization means to prevent large variations in said voltage level output.

Claim 9

The system of claim 1 wherein said pulse generating means comprises a mask having an opening therein operable in synchronism with said device and means including a light source and a photocell positioned to be actuated when said opening is aligned between said light source and photocell to produce said generated pulses.

Claim 10

In a facsimile system, a synchronizing system for synchronizing facsimile recording means with synchronizing electrical pulses transmitted between each line of transmitted copy at a predetermined first frequency comprising a motor for driving said recording means, means for generating electrical pulses at a frequency dependent on the speed of said motor, means for driving said motor at variable speeds, and means operable responsive to no time coincidence of said synchronizing and generated pulses for controlling said motor driving means to drive said motor at a quiescent speed at which said generated pulse frequency is slightly different than said predetermined frequency and operable responsive to a predetermined minimum of time coincidence of said synchronizing and generated pulses for controlling said motor driving means to sweep the speed of said motor through the speed at which generated pulses of said predetermined frequency are produced towards said quiescent speed between periods of said pulse time coincidence.

Claim 11

In a facsimile system, a synchronizing system for synchronizing facsimile recording means with synchronizing electrical pulses transmitted between each line of transmitted copy at a predetermined first frequency comprising a motor for driving said recording means, means for generating electrical pulses at a frequency dependent on the speed of said motor, means for driving said motor at variable speeds, and means operable responsive to no time coincidence of said synchronizing and generated pulses for controlling said motor driving means to drive said motor at a quiescent speed at which said generated pulse frequency is slightly different than said predetermined frequency and operable responsive to a predetermined minimum of time coincidence of said synchronizing and generated pulses for controlling said motor driving means to sweep the speed of said motor through the speed at which generated pulses of said predetermined frequency are produced towards said quiescent speed between periods of said pulse time coincidence.

Claim 12

In a facsimile system receiver, a synchronizing system for synchronizing facsimile recording means with synchronizing electrical pulses transmitted between each line of transmitted copy at a predetermined first frequency comprising a synchronous motor for driving said recording means, means for generating electrical pulses at a frequency dependent on the speed of said motor, a variable frequency oscillator for driving said motor, and means operable responsive to no time coincidence of said synchronizing and generated pulses for controlling said oscillator to drive said motor at a quiescent speed at which said generated pulse frequency is slightly different than said predetermined frequency and operable responsive to a predetermined minimum of time coincidence of said synchronizing and generated pulses for controlling said oscillator to sweep the speed of said motor through the speed at which generated pulses of said predetermined frequency are produced towards said quiescent speed between periods of said pulse time coincidence.

Claim 13

In a facsimile system receiver, a synchronizing system for synchronizing facsimile recording means with synchronizing electrical pulses transmitted between each line of transmitted copy at a predetermined first frequency comprising a synchronous motor for driving said recording means, means for generating electrical pulses at a frequency dependent on the speed of said motor, a variable frequency oscillator for driving said motor, and means operable responsive to no time coincidence of said synchronizing and generated pulses for controlling said oscillator to drive said motor at a quiescent speed at which said generated pulse frequency is slightly different than said predetermined frequency and operable responsive to a predetermined minimum of time coincidence of said synchronizing and generated pulses for controlling said oscillator to sweep the speed of said motor through the speed at which generated pulses of said predetermined frequency are produced towards said quiescent speed between periods of said pulse time coincidence.

Claim 14

The facsimile system of claim 8 wherein said motor driving means operates responsive to variations in a DC voltage level, and wherein said controlling means comprises means for developing a quiescent voltage level at its output with no pulse time coincidence, for changing its voltage level output during pulse time coincidence an amount determined by the amount of pulse time coincidence, and for sweeping said voltage level back toward said quiescent voltage level after each pulse coincidence.

Claim 15

The facsimile system of claim 10 in which said controlling means comprises an And gate in receipt of said synchronizing and generated pulses to determine the amount of pulse time coincidence.

Claim 16

The facsimile system of claim 11 wherein said voltage developing changing and sweeping means comprises a first capacitor chargeable during pulse coincidence to a peak voltage level determined by the amount of pulse coincidence, means for discharging said capacitoR after pulse coincidence rapidly with respect to the period of said synchronizing pulses, means including at least one other capacitor for charging said other capacitor to a peak voltage determined by the peak voltage of said first capacitor during pulse coincidence, means including at least one resistor for discharging said other capacitor slowly with respect to the period of said synchronizing pulses, and means providing the voltage level output of said controlling means in accordance with the voltage on said other capacitor.

Claim 17

The facsimile system of claim 12 wherein said controlling means comprises in addition servo stabilization means to prevent large variations in said voltage level output.

Claim 18

The system of claim 8 wherein said pulse generating means comprises a mask having an opening therein operable in synchronism with said recording means, and means including a light source and a photocell positioned to be actuated when said opening is aligned between said light source and photocell to produce said generated pulses.

Claim 19

In combination with a combined facsimile transmitter and receiver device for selectively scanning a document periodically to produce and transmit video copy and synchronizing signals during a transmit mode and for receiving transmitted video copy and synchronizing signals to scan and reproduce on a marking medium a scanned document in synchronism with the transmitted signals during a receive mode, means for generating synchronizing and blanking pulses comprising a first pulse generator for generating a first pulse during a portion of each scan, a second pulse generator for generating a second pulse immediately after each first pulse, means for selectively applying the output of one of said pulse generators to said transmitted signal for producing said synchronizing signal when said device is in the transmitter mode, means for using the output of the other of said pulse generators for synchronizing the device with the received synchronizing signals when said device is in the receiver mode, and means for using the outputs of both signal generators to prevent marking of the medium during their existence when said device is in the receiver mode.

Claim 20

In combination with a combined facsimile transmitter and receiver device for selectively scanning a document periodically to produce and transmit video copy and synchronizing signals during a transmit mode and for receiving transmitted video copy and synchronizing signals to scan and reproduce on a marking medium a scanned document in synchronism with the transmitted signals during a receive mode, means for generating synchronizing and blanking pulses comprising a first pulse generator for generating a first pulse during a portion of each scan, a second pulse generator for generating a second pulse immediately after each first pulse, means for selectively applying the output of one of said pulse generators to said transmitted signal for producing said synchronizing signal when said device is in the transmitter mode, means for using the output of the other of said pulse generators for synchronizing the device with the received synchronizing signals when said device is in the receiver mode, and means for using the outputs of both signal generators to prevent marking of the medium during their existence when said device is in the receiver mode.

Claim 21

In the combination of claim 15 wherein said first pulse generator comprises a light source, circuit means including a photocell for developing a signal responsive to light, and a mask having an opening positionable between said light source and said photocell for a portion of each scan and wherein said second pulse generator comprises another light source, circuit means including a second photocell for developing a signal responsive to light and said mask having a second opening therein positionable between said light source and said photocell for a portion of each scan immediately following the generation of said first pulse.

Claim 22

A synchronizing system for synchronizing a periodically operable device with synchronizing electric pulses of a predetermined first frequency, comprising a motor for driving said device, means for generating electric pulses at a frequency dependent on the speed of said motor, means operable responsive to variations in a DC voltage level for driving said motor at a quiescent speed at which said generated pulse frequency is slightly different than said first frequency, a first capacitor, an And gate operable responsive to the time coincidence of said synchronizing and generated pulses for charging said first capacitor to a peak voltage dependent on the time length of the pulse coincidence, and for thereafter discharging said first capacitor rapidly with respect to the period of said synchronizing pulses, an emitter follower transistor circuit having said first capacitor across its input and a second capacitor across its output, said emitter follower circuit operable to charge said second capacitor to approximately the same voltage level peak as said first capacitor during pulse time coincidence, means including a transistor amplifier providing a slow discharge path for said second capacitor with respect to the period of said synchronizing pulses, and means at the output of said transistor amplifier providing the DC voltage for operating said motor driving means.

Claim 23

A synchronizing system for synchronizing a periodically operable device with synchronizing electric pulses of a predetermined first frequency, comprising a motor for driving said device, means for generating electric pulses at a frequency dependent on the speed of said motor, means operable responsive to variations in a DC voltage level for driving said motor at a quiescent speed at which said generated pulse frequency is slightly different than said first frequency, a first capacitor, an And gate operable responsive to the time coincidence of said synchronizing and generated pulses for charging said first capacitor to a peak voltage dependent on the time length of the pulse coincidence, and for thereafter discharging said first capacitor rapidly with respect to the period of said synchronizing pulses, an emitter follower transistor circuit having said first capacitor across its input and a second capacitor across its output, said emitter follower circuit operable to charge said second capacitor to approximately the same voltage level peak as said first capacitor during pulse time coincidence, means including a transistor amplifier providing a slow discharge path for said second capacitor with respect to the period of said synchronizing pulses, and means at the output of said transistor amplifier providing the DC voltage for operating said motor driving means.

Claim 24

A synchronizing system for synchronizing a periodically operable device with synchronizing electrical pulses of a predetermined first frequency comprising means for operating said device, means for generating electrical pulses at a frequency dependent on the operating rate of said operating means, means for causing said operating means to operate at variable rates, means for controlling said causing means to cause said operating means to operate at a quiescent rate at which said generated pulse frequency is slightly different than said first frequency when there is no time coincidence of said synchronizing and generated pulses and operable responsive to a predetermined minimum of time coincidence of said synchronizing and generated pulses for controlling said causing means to sweep the rate of said operating means through the rate at which generated pulses of said predetermined frequency are produced towards said quiescent rate between periods of said pulse time coincidence.

Claim 25

A synchronizing system for synchronizing a periodically operable device with synchronizing electrical pulses of a predetermined first frequency comprising means for operating said device, means for generating electrical pulses at a frequency dependent on the operating rate of said operating means, means for causing said operating means to operate at variable rates, means for controlling said causing means to cause said operating means to operate at a quiescent rate at which said generated pulse frequency is slightly different than said first frequency when there is no time coincidence of said synchronizing and generated pulses and operable responsive to a predetermined minimum of time coincidence of said synchronizing and generated pulses for controlling said causing means to sweep the rate of said operating means through the rate at which generated pulses of said predetermined frequency are produced towards said quiescent rate between periods of said pulse time coincidence.