Method and apparatus for printing a ribbon for packaging gelatin capsules
View Patent ↗Apparatus for producing image bearing filled gelatin capsules ( 12 and 16 ) for directing gelatin ribbon ( 2,4 ) from respective casting drums to an encapsulation station ( 6 ). Along the path of at least one ribbon ( 4 ) is a transfer station ( 18 ) at which images are applied to the ribbon. The images are applied in a pattern which corresponds to the pattern of capsules formed from the ribbon at the encapsulation station ( 6 ). Both the rollers ( 8 ) at the encapsulation station, and a support roller at or adjacent the transfer station are positively drive, and a control system ensures that the peripheral speed of a support roller ( 16 ) in the transfer station ( 18 ) is the same as the speed of the ribbon into and through the encapsulation station. The drive motor for the respective support roller in the transfer station is preferably a stepping motor, adjustable to advace or retard relative to the ribbon spped in the encapsulation station ( 6 ). Sensors ( 28, 64 ) may be included to postiviely monitor the alignment of ribbon with the encapsulation process. Provision is also made for monitoring the lateral positioning of images on the ribbon, and for shifting the ribbon to accommodate any lateral misalignment.
1. A method of producing filled soft capsules comprising: feeding film into juxtaposition at an encapsulation station ( 6 ) having formation and fill means, the improvement characterized by the steps of:
(a) applying images to at least one of the films ( 2 , 4 ) at a transfer station ( 18 ) comprising a print roller ( 20 ), an inking roller ( 22 ), a support roller ( 16 ), and a stepping motor ( 30 ) for driving the print roller ( 20 ); and a guide bar assembly, said guide bar assembly ( 52 ) comprising sensing means ( 64 ) for monitoring lateral movement of said film, and a locator roller ( 56 ) mounted for rotation above a pivotal axis to shift said film laterally; and
(b) adjusting the speed of the film ( 2 , 4 ) in the transfer station ( 18 ) to correct any error in the longitudinal position of images on the film ( 2 , 4 ) in the encapsulation station ( 6 ).
2. The method according to claim 1 , additionally Including the step of monitoring the lateral alignment of images on the film ( 2 , 4 ) in the encapsulation station ( 6 ) and shifting the film transversely to correct any misalignment.
3. The method according to claim 2 wherein the lateral alignment of the film ( 2 , 4 ) is monitored by observing an edge of the film or a line applied to the film adjacent to said edge.
4. The method according to claim 3 wherein said line is applied at the transfer station ( 18 ).