Claims
- 1. An adjustment apparatus for adjusting the speed of a plate roller relative to a pressing roller, between which plastic bags pass in a plastic bag printer, comprising:
- clutch means mounted on a driving shaft, said pressing roller being mounted on one end thereof, said clutch means comprising a first clutch and a second clutch each including a stationary plate fixed on a housing, said clutch means further including a clutch ring and a clutch slip plate, said stationary plate being provided with an electromagnetic member thereon for the mutual exclusive operation of said first and said second clutches;
- transmission means comprising a transmission shaft, a first transmission gear wheel and a second transmission gear wheel, said first and second transmission gear wheels being fixedly coupled to said transmission shaft;
- a main gear wheel rotatably mounted on said driving shaft and being coupled thereto by said first clutch when said electromagnetic member of said first clutch is energized, said main gear wheel being in engagement with said first transmission gear wheel;
- an adjustment gear wheel rotatably mounted on said driving shaft adjacent to said main gear wheel, said adjustment gear wheel being in engagement with said second transmission gear wheel and being made operative by said second clutch;
- a driven gear coupled to one end of said plate roller, said driven gear being in engagement with said main gear wheel for maintaining a rotational speed of said plate roller relative to said pressing roller.
- 2. An adjustment apparatus as recited in claim 1 wherein the number of teeth of said main gear wheel is greater than that of said adjustment gear wheel.
- 3. An adjustment apparatus as recited in claim 2 wherein the number of teeth of said main gear wheel is equal to that of said first and second transmission gear wheels.
- 4. An adjusting apparatus as recited in claim 1 where said main gear wheel, said first and said second transmission gear wheels each have 65 teeth while said adjustment gear wheel has 64 teeth.
- 5. Apparatus for adjusting the color registration of a printer by adjusting the relative speed between a pair of roller comprising a pressing cylinder and a plate cylinder driven in synchronism by drive means, one of the rollers defining a first cylinder being driven form the drive means by a first transmission means, the first transmission means including (1) a main gear rotatably mounted on a driving shaft, (2) a first clutch for engaging the main gear with the driving shaft and (3) a driven gear driven by the main gear for driving said first cylinder, second transmission means between the drive means and a second cylinder defined by the other of said pair of rollers, the second transmission means including (1) an adjustment gear rotatably mounted on the driving shaft, (2) a second clutch for engaging the adjustment gear with the driving shaft when the first clutch is disengaged, (3) a first transmission gear mounted on a transmission shaft for driving the main gear about the driving shaft so as to drive said first cylinder through said driven gear and (4) a second transmission gear mounted on the transmission shaft in driving relationship with said adjustment gear, and control means acutable temporarily to disengage the first transmission means and engage the second transmission means, the second transmission driving said second cylinder out of synchronism with said first cylinder, so as relatively to adjust the cylinders.
- 6. Apparatus according to claim 5, wherein the first transmission gear and the main gear have a gear tooth ratio therebetween differing from a gear tooth ratio between the second transmission gear and the adjustment gear.
- 7. Apparatus according to claim 6, wherein the main gear and the first and second transmission gears have 65 teeth while the adjustment gear has 64 teeth.
REFERENCES TO RELATED PATENT APPLICATIONS
This patent application is a continuation-in-part of patent application Ser. No. 864,819, filed on May 15, 1986, now abandoned, entitled "AN ADJUSTMENT APPARATUS OF COLOR SUPERIMPOSEMENT FOR PLASTIC BAG PRINTER".
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3742849 |
Greiner |
Jul 1973 |
|
4363270 |
Ury et al. |
Dec 1982 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
864819 |
May 1986 |
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