Examples described herein include devices and methods for adjusting a suction force for a media holddown, comprising detecting an advancement of a media (114) relative to a media holddown surface along a media advancement direction (X), wherein the holddown surface has a plurality of suction zones arranged along the media advancement direction, and adjusting a suction force in the respective suction zones in accordance with the advancement of the media relative to the media holddown surface.

Examples described herein include devices and methods for adjusting a suction force for a media holddown, comprising detecting an advancement of a media (114) relative to a media holddown surface along a media advancement direction (X), wherein the holddown surface has a plurality of suction zones arranged along the media advancement direction, and adjusting a suction force in the respective suction zones in accordance with the advancement of the media relative to the media holddown surface.

According to an example, an apparatus to prevent media transport jams may include an actuator to load and advance a media within a media path width. The apparatus may also include a first sensor and a second sensor to detect respective edges of the media, in which the first sensor and the second sensor may be positioned outside of a media action area and on opposite sides of the media path width. The apparatus may further include a controller to prevent the actuator from advancing the media along the media path in response to a detection of one or both of the first edge of the media by the first sensor and the second edge of the media by the second sensor.

According to an example, an apparatus to prevent media transport jams may include an actuator to load and advance a media within a media path width. The apparatus may also include a first sensor and a second sensor to detect respective edges of the media, in which the first sensor and the second sensor may be positioned outside of a media action area and on opposite sides of the media path width. The apparatus may further include a controller to prevent the actuator from advancing the media along the media path in response to a detection of one or both of the first edge of the media by the first sensor and the second edge of the media by the second sensor.

A sensor unit includes an edge detection sensor, a sensor carriage, a unit housing, and a carriage moving mechanism. The edge detection sensor is arranged in a conveying portion for conveying a sheet and senses edge positions at both sides in a sheet width direction perpendicular to a sheet conveying direction. The sensor carriage has a carriage main body in which the edge detection sensor is incorporated, and is reciprocatably supported on the unit housing in the sheet width direction. The carriage moving mechanism makes the sensor carriage reciprocate in the sheet width direction. The sensor carriage is selectively positioned at a first position where it makes contact with a first side face at one end side of the unit housing in the sheet width direction or a second position where it makes contact with a second side face at the other end side in the sheet width direction.

According to an example, an apparatus to prevent media transport jams may include an actuator to load and advance a media within a media path width. The apparatus may also include a first sensor and a second sensor to detect respective edges of the media, in which the first sensor and the second sensor may be positioned outside of a media action area and on opposite sides of the media path width. The apparatus may further include a controller to prevent the actuator from advancing the media along the media path in response to a detection of one or both of the first edge of the media by the first sensor and the second edge of the media by the second sensor.

According to an example, an apparatus to prevent media transport jams may include an actuator to load and advance a media within a media path width. The apparatus may also include a first sensor and a second sensor to detect respective edges of the media, in which the first sensor and the second sensor may be positioned outside of a media action area and on opposite sides of the media path width. The apparatus may further include a controller to prevent the actuator from advancing the media along the media path in response to a detection of one or both of the first edge of the media by the first sensor and the second edge of the media by the second sensor.

An apparatus and method for determining sheet material edges on a surface including a sensor configured to detect an outer edge and a usable edge of the sheet material and a controller in communication with the sensor. The sensor comprises a first color optical sensor producing a first signal representing a first physical attribute of the sheet material and a second color optical sensor producing a second signal representing a second physical attribute of the sheet material. The controller comprises a processor, a memory, and a communications adapter, controls dispensing and spreading of the sheet material for detection by the sensor, and signals to a user a presence of the usable edge in the sheet material upon detection by the sensor.

A register (20; 60) for a processing machine (1) for processing plate-like elements (10) includes a gripping element (21; 22) for placing the plate-like elements (10) in a gripper bar (31) of a conveyor (30) of a processing machine (1) conveying the plate-like elements (10) in a longitudinal direction, an actuator module (201, 202) to drive the gripping element (21; 22), at least one front correction sensor module (7) configured to measure the front position of register marks (12a) printed on a front section of the plate-like element (10) grasped by the gripping element (21; 22). The register (20; 60) includes at least one front pre-correction sensor module (80), placed upstream of the front correction sensor module (7) in the longitudinal direction, the front pre-correction sensor module (80) is configured: to detect the passage of a front transversel edge of the plate-like element (10) in at least two longitudinally spaced lateral axis of detection (P1, P2), one located in front of the other, and to provide measurements to a computation and control unit (40) of the processing machine (1) that is configured: to control the actuator module (201, 202) in order to move the gripping element (21; 22) toward the gripper bar (31) and to activate the gripping element (21; 22) in order to grasp a plate-like element (10). Also a processing machine for processing plate-like elements includes the register. A method for placing plate-like elements within a processing machine is disclosed.

A register (20; 60) for a processing machine (1) for processing plate-like elements (10) includes a gripping element (21; 22) for placing the plate-like elements (10) in a gripper bar (31) of a conveyor (30) of a processing machine (1) conveying the plate-like elements (10) in a longitudinal direction, an actuator module (201, 202) to drive the gripping element (21; 22), at least one front correction sensor module (7) configured to measure the front position of register marks (12a) printed on a front section of the plate-like element (10) grasped by the gripping element (21; 22). The register (20; 60) includes at least one front pre-correction sensor module (80), placed upstream of the front correction sensor module (7) in the longitudinal direction, the front pre-correction sensor module (80) is configured: to detect the passage of a front transversel edge of the plate-like element (10) in at least two longitudinally spaced lateral axis of detection (P1, P2), one located in front of the other, and to provide measurements to a computation and control unit (40) of the processing machine (1) that is configured: to control the actuator module (201, 202) in order to move the gripping element (21; 22) toward the gripper bar (31) and to activate the gripping element (21; 22) in order to grasp a plate-like element (10). Also a processing machine for processing plate-like elements includes the register. A method for placing plate-like elements within a processing machine is disclosed.