Method of and apparatus for driving engraving machines of the drum type

Claim 3

The method according to claim 1 wherein the derived frequencies are less than the master frequency, and said step of deriving is further defined as dividing the master frequency to obtain a plurality of lower frequencies.

Claim 4

An engraving machine comprising: a scanning drum; a scanning head operatively associated with said scanning drum; a recording drum; a recording head operatively associated with said recording drum and operatively connected to said scanning head; first means including a first synchronous motor for rotating said scanning drum at a first speed; second means including a second synchronous motor for traversing said scanning head across said scanning drum at a second speed; third means including a third synchronous motor for rotating said recording drum at a third speed; fourth means including a fourth synchronous motor for traversing said recording head across said recording drum at a fourth speed; generating means for providing a voltage at a master frequency; and means connected between said master frequency generating means and said first, second, third and fourth synchronous motors for deriving corresponding frequencies for establishing the corresponding speeds of rotation.

Claim 5

An engraving machine comprising: a scanning drum; a scanning head operatively associated with said scanning drum; a recording drum; a recording head operatively associated with said recording drum and operatively connected to said scanning head; first means including a first synchronous motor for rotating said scanning drum at a first speed; second means including a second synchronous motor for traversing said scanning head across said scanning drum at a second speed; third means including a third synchronous motor for rotating said recording drum at a third speed; fourth means including a fourth synchronous motor for traversing said recording head across said recording drum at a fourth speed; generating means for providing a voltage at a master frequency; and means connected between said master frequency generating means and said first, second, third and fourth synchronous motors for deriving corresponding frequencies for establishing the corresponding speeds of rotation.

Claim 6

The engraving machine as defined in claim 3, wherein said scanning head, said scanning drum and said first and second means for rotating the scanning drum and traversing the scanning head are at a first location and wherein said recording head, said recording drum and said third and fourth means for rotating said recording drum and traversing the recording head are located at a second location remote from the first location, and said master frequency-generating means comprises a first generator at said first location and a second generator at said second location, and said frequency dividing means includes a first dividing means at said first location and a second frequency-dividing means at said second location, the first and second frequency-dividing means being connected between the generating means and the drum and head moving means at their respective locations.

Claim 7

In an engraving machine having a scanning drum, a recording drum, a scanning head and a recording head which may be operatively moved in accordance wIth a plurality of desired reproduction ratios, apparatus for establishing said reproduction ratios comprising: means for generating a master frequency; a plurality of frequency-translating means connected to the master frequency-generating means for providing from the master frequency a plurality of other frequencies which are individually representative of desired speeds of movement and accordingly represent reproduction ratios; and a plurality of means individually connected between said frequency-translating means and the scanning drum, scanning head, reproducing drum and reproducing head for moving the last-mentioned elements in accordance with the translated frequencies.

Claim 8

In an engraving machine having a scanning drum, a recording drum, a scanning head and a recording head which may be operatively moved in accordance wIth a plurality of desired reproduction ratios, apparatus for establishing said reproduction ratios comprising: means for generating a master frequency; a plurality of frequency-translating means connected to the master frequency-generating means for providing from the master frequency a plurality of other frequencies which are individually representative of desired speeds of movement and accordingly represent reproduction ratios; and a plurality of means individually connected between said frequency-translating means and the scanning drum, scanning head, reproducing drum and reproducing head for moving the last-mentioned elements in accordance with the translated frequencies.

Claim 9

Apparatus as defined in claim 5, wherein each of said frequency-translating means comprises a frequency divider.

Claim 10

Apparatus as defined in claim 6, wherein said master frequency generator is single phased and wherein each of said frequency-translating means further comprises means for deriving three-phase output voltage.

Claim 11

Apparatus as defined in claim 7, wherein said means for deriving a three-phase voltage includes means for deriving a six-phase voltage and means for combining phases to provide said three-phase voltage.

Claim 12

Apparatus as defined in claim 8, wherein each of said translating means comprises amplifying means connected between said means for deriving three-phase voltage and the respective movable element.

Claim 13

Apparatus as defined in claimed 5, wherein the recording head includes a stylus and wherein said apparatus comprises additional frequency-translating means connected between said master frequency generator and said recording head for providing said stylus with a constant operating frequency.