Line plastic bag machine
First Claim
1. In an in line plastic bag machine comprising:
- first and second side walls;
a plurality of rollers mounted between the side walls for receiving a web of plastic film that is trained through the machine over and around the rollers;
a main drive motor;
a main drive shaft driven by said main drive motor;
said rollers including a main drive roller and a pair of spaced apart shuttle rollers mounted in a shuttle assembly;
drive means for driving said main roller from said main drive shaft;
said shuttle assembly being mounted for back and forth movement thereby to position an incremental width of the web of film traveling over the shuttle rollers in a momentary stationary position as the web of film is moving through the machine so that the incremental width of the film is momentarily stationery relative to the side walls;
drive means for moving said shuttle assembly;
a perforating and sealing head which is movably mounted relative to said side walls for moving upwardly and downwardly over and relative to the incremental width of the web of film for sealing and perforating the incremental width of the web of film in cooperation with an underlying platen when the incremental width of web is momentarily stationary, thereby to sequentially form bags in the web of film; and
, head drive means for moving the head;
the improvement comprising;
electrical control circuit for controlling the operation of the shuttle drive means and the head drive means relative to the speed of rotation of the main drive shaft, said electric control circuit including a master encoder mounted at one end of said main drive shaft for outputting a predetermined number of pulses for each revolution of the drive, said shuttle drive means comprising a servo motor connected to an output shaft which is connected by linkage to said shuttle assembly and said electrical circuit including logic circuitry for driving said output shaft through a predetermined arc at a predetermined speed as determined by the pulse count received from said master encoder thereby to control the time of movement and speed of movement of said shuttle assembly thereby to maintain the incremental width of the web of film stationary momentarily beneath said sealing and perforating head.
1 Assignment
0 Petitions
Accused Products
Abstract
The line plastic bag machine comprises: first and second side walls; a plurality of rollers mounted between the side walls for receiving a web of plastic film that is trained through the machine over and around the rollers; a main drive motor; a main drive shaft driven by the main drive motor; the rollers including a main drive or chrome roller and a pair of spaced apart shuttle rollers mounted in a shuttle assembly; a drive train for driving from main chrome roller from the main drive shaft; the shuttle assembly being mounted for back and forth movement thereby to position an incremental width of the web of film traveling over the shuttle rollers in a momentary stationary position as the web of film is moving through the machine so that the incremental width of the film is momentarily stationery relative to the side walls; drive apparatus for moving the shuttle assembly; a perforating and sealing head which is movably mounted relative to the side walls for moving upwardly and downwardly over and relative to the incremental width of the web of film for sealing and perforating the incremental width of the web of film in cooperation with an underlying platen when the incremental width of web is momentarily stationary, thereby to sequentially form bags in the web of film; head drive apparatus for moving the head; and electrical control circuitry for controlling the operation of the shuttle drive apparatus and the head drive apparatus relative to the speed of rotation of the main drive shaft.
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Citations
16 Claims
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1. In an in line plastic bag machine comprising:
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first and second side walls;
a plurality of rollers mounted between the side walls for receiving a web of plastic film that is trained through the machine over and around the rollers;
a main drive motor;
a main drive shaft driven by said main drive motor;
said rollers including a main drive roller and a pair of spaced apart shuttle rollers mounted in a shuttle assembly;
drive means for driving said main roller from said main drive shaft;
said shuttle assembly being mounted for back and forth movement thereby to position an incremental width of the web of film traveling over the shuttle rollers in a momentary stationary position as the web of film is moving through the machine so that the incremental width of the film is momentarily stationery relative to the side walls;
drive means for moving said shuttle assembly;
a perforating and sealing head which is movably mounted relative to said side walls for moving upwardly and downwardly over and relative to the incremental width of the web of film for sealing and perforating the incremental width of the web of film in cooperation with an underlying platen when the incremental width of web is momentarily stationary, thereby to sequentially form bags in the web of film; and
,head drive means for moving the head;
the improvement comprising;
electrical control circuit for controlling the operation of the shuttle drive means and the head drive means relative to the speed of rotation of the main drive shaft, said electric control circuit including a master encoder mounted at one end of said main drive shaft for outputting a predetermined number of pulses for each revolution of the drive, said shuttle drive means comprising a servo motor connected to an output shaft which is connected by linkage to said shuttle assembly and said electrical circuit including logic circuitry for driving said output shaft through a predetermined arc at a predetermined speed as determined by the pulse count received from said master encoder thereby to control the time of movement and speed of movement of said shuttle assembly thereby to maintain the incremental width of the web of film stationary momentarily beneath said sealing and perforating head. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. In an in line plastic bag machine comprising;
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first and second side walls;
a plurality of rollers mounted between the side walls for receiving a web of plastic film that is trained through the machine over and around the rollers;
a main drive motor;
a main drive shaft driven by said main drive motor;
said rollers including a main drive roller and a pair of spaced apart shuttle rollers mounted in a shuttle assembly;
drive means for driving said main roller from said main drive shaft;
said shuttle assembly being mounted for back and forth movement thereby to position an incremental width of the web of film traveling over the shuttle rollers in a momentary stationary position as the web of film is moving through the machine so that the incremental width of the film is momentarily stationery relative to the side walls;
drive means for moving said shuttle assembly;
a perforating and sealing head which is movably mounted relative to said side walls for moving upwardly and downwardly over and relative to the incremental width of the web of film for sealing and perforating the incremental width of the web of film in cooperation with an underlying platen when the incremental width of web is momentarily stationary, thereby to sequentially form bags in the web of film; and
,head drive means for moving the head;
the improvement comprising;
an electrical control circuit for controlling the operation of the shuttle drive means and the head drive means relative to the speed of rotation of the main drive shaft, said electric control circuit including a master encoder mounted at one end of said main drive shaft for outputting a predetermined number of pulses for each revolution of the drive, and said head being pivotally mounted to and between said side walls and said head drive means including a servo motor connected by linkage to said sealing and perforating head and said electrical control circuit further including logic circuitry for controlling the operation of the servo motor for causing the downward and upward movement of said head and for controlling the dwell time of the head in the lower position relative to the pulse count received from said master encoder.
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16. In an in line plastic bag machine comprising:
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first and second side walls;
a plurality of rollers mounted between the side walls for receiving a web of plastic film that is trained through the machine over and around the rollers;
a main drive motor;
a main drive shaft driven by said main drive motor;
said rollers including a main drive roller and a pair of spaced apart shuttle rollers mounted in a shuttle assembly;
drive means for driving said main roller from said main drive shaft;
said shuttle assembly being mounted for back and forth movement thereby to position an incremental width of the web of film traveling over the shuttle rollers in a momentary stationary position as the web of film is moving through the machine so that the incremental width of the film is momentarily stationery relative to the side walls;
drive means for moving said shuttle assembly;
a perforating and sealing head which is movably mounted relative to said side walls for moving upwardly and downwardly over and relative to the incremental width of the web of film for sealing and perforating the incremental width of the web of film in cooperation with an underlying platen when the incremental width of web is momentarily stationary, thereby to sequentially form bags in the web of film; and
,head drive means for moving the head;
the improvement comprising;
an electrical control circuit for controlling the operation of the shuttle drive means and the head drive means relative to the speed of rotation of the main drive shaft, said electric control circuit including a master encoder mounted at one end of said main drive shaft for outputting a predetermined number of pulses for each revolution of the drive, and said machine including a second roller and a servo motor having an output shaft coupled to said second roller and said electrical control circuit including logic circuitry for driving said servo motor relative to the pulse count received for causing said servo motor to rotate said second roller at a speed of rotation slightly faster or slightly slower than the speed of rotation of said main drive shaft.
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Specification