Screening machine and screening cylinder
View Patent ↗The invention relates to a screening machine comprising a frame and two bearing arrangements which are arranged thereon for the rotational positioning of a screening cylinder, whereby the bearing arrangements comprise rings which are rotationally driven around a common axis and which support catches on the sides opposite to each other. In order to enable the head piece of the screening cylinder to be mounted on the ring, said catches can be positioned on one half of the periphery thereof.
1. A screen printing machine comprising first and second bearing arrangements for holding a screen cylinder provided with first and second flanges at extremities thereof, wherein said first bearing arrangement comprises a first ring for receiving the first flange of the screen cylinder and said second bearing arrangement comprises a second ring for receiving the second flange of the screen cylinder, each one of said first and second rings being composed of an inner part-ring which bears at least a first claw and an outer part-ring which can be rotated about an axis of rotation of the screen cylinder with respect to the innner part-ring and which bears at least a second claw.
2. The screen printing machine as claimed in claim 1 , wherein said first bearing arrangement further comprises at least one actuator for displacing the first ring in a direction parallel to the axis of rotation of the screen cylinder for tensioning the screen cylinder or releasing tension of the screen cylinder.
3. The screen printing machine as claimed in claim 1 , wherein said second claw can be rotated about the axis of rotation of the screen cylinder with respect to the first claw to a position in which said second claw lies together with said first claw within an angular range of 180° axis of rotation of the screen cylinder.
4. The screen printing machine as claimed in claim 1 , wherein said second claw can be rotated about the axis of rotation of the screen cylinder to a position in which a center of gravity of said second claw lies diametrically opposite said first claw with respect to the axis of rotation of the screen cylinder.
5. The screen printing machines as claimed in claim 1 , wherein at least the first and second claws of the first bearing arrangement have spring elements for exerting an axial force oriented away from the second bearing arrangement, which spring elements cooperate with the first flange of the screen cylinder.
6. The screen printing as claimed in claim 5 , wherein, during operation of the screen printing machine, the spring elements keep open a gap between the first flange of the screen cylinder and inner surfaces of the first and second claws.
7. The screen printing machine as claimed in claim 1 , wherein each one of said first and second flanges has first and second sections with different radial widths defining radially oriented surfaces between the first and second sections, said radially oriented surfaces being in contact with side surfaces of the first claw of the first ring, respectively second ring.
8. The screen printing machine as claimed in claim 1 , wherein said first and second rings are rotatable about the axis of rotation of the screen cylinder and drive the screen cylinder in rotation.