The present disclosure discloses a screen printing system and a cleaning method thereof. The screen printing system has a scraper cleaning region and a working region, and the screen printing system includes a scraper and a scraper cleaning unit. The scraper operates within the working region, and the scraper cleaning unit is configured to clean the scraper. The scraper and the scraper cleaning unit are configured as follows: the scraper stays in the working region, and the scraper cleaning unit moves to a position where the scraper stays to clean the scraper; or the scraper cleaning unit is positioned in the scraper cleaning region, and the scraper moves to the scraper cleaning region, so that the scraper cleaning unit cleans the scraper.

A screen printing apparatus includes an inspection region setter and an operation stop controller. The inspection region setter sets an inspection region in an inspection plane that intersects with a moving path of a mask until the mask positioned at a printing-job performing position moves to a mask shelter position by the moving mechanism. In addition, the inspection region setter excludes a passing region of the mask from the inspection region while the mask to be positioned at the mask shelter position passes over the inspection plane from the printing-job performing position.

A screen printing apparatus includes an inspection region setter and an operation stop controller. The inspection region setter sets an inspection region in an inspection plane that intersects with a moving path of a mask until the mask positioned at a printing-job performing position moves to a mask shelter position by the moving mechanism. In addition, the inspection region setter excludes a passing region of the mask from the inspection region while the mask to be positioned at the mask shelter position passes over the inspection plane from the printing-job performing position.

A printing screen method includes: providing at least one printing scraper assembly, wherein the printing scraper assembly has a printing scraper and a pressure sensing feedback system; placing at least one printing screen on a substrate; detecting and supplying a pressure value between the printing scraper and the printing screen during printing by the pressure sensing feedback system; and comparing the supplied pressure value and a predetermined pressure value, and changing the pressure between the printing scraper and the printing screen if a difference between the feedback pressure value and the predetermined pressure value is larger than a predetermined threshold. An imprinting apparatus implementing the printing screen method is also provided.

A screen printing apparatus includes a pair of clampers that clamp a substrate, a mask plate contacted to the substrate, a pair of squeegees provided above the mask plate vertically, and a squeegee controller that selectively controls one of the pair of squeegees to move in the horizontal direction in abutment against the mask plate so that the selected one of the pair of squeegees slides on the mask plate.

A screen printing apparatus includes a pair of clampers that clamp a substrate, a mask plate contacted to the substrate, a pair of squeegees provided above the mask plate vertically, and a squeegee controller that selectively controls one of the pair of squeegees to move in the horizontal direction in abutment against the mask plate so that the selected one of the pair of squeegees slides on the mask plate.

An electrostatic screen printer includes: an electrically conductive screen arranged in non-contact with a printing medium; sponges for rubbing a powder into the screen; and a direct current power source for applying a voltage to the printing medium and the powder, wherein the powder rubbed into the screen is adhered to the printing medium by electrostatic induction. The electrostatic screen printer includes a rotation mechanism for rotating the sponges, a parent revolution mechanism for parent revolution of the sponges, and a child revolution mechanism for child revolution of the sponges. The revolution speed ratio of the child revolution to the parent revolution may preferably be 4.0 or greater, a scraper is provided on the parent revolution mechanism so as to be interlocked with the revolution of the sponges, and the scraper is arranged so as to scrape the powder on the screen toward an axis of the parent revolution because of the interlocking.

An electrostatic screen printer includes: an electrically conductive screen arranged in non-contact with a printing medium; sponges for rubbing a powder into the screen; and a direct current power source for applying a voltage to the printing medium and the powder, wherein the powder rubbed into the screen is adhered to the printing medium by electrostatic induction. The electrostatic screen printer includes a rotation mechanism for rotating the sponges, a parent revolution mechanism for parent revolution of the sponges, and a child revolution mechanism for child revolution of the sponges. The revolution speed ratio of the child revolution to the parent revolution may preferably be 4.0 or greater, a scraper is provided on the parent revolution mechanism so as to be interlocked with the revolution of the sponges, and the scraper is arranged so as to scrape the powder on the screen toward an axis of the parent revolution because of the interlocking.

A screen printing head for and method of printing deposits of a print medium onto a workpiece through apertures in a printing screen, the printing head comprising a vibration unit for vibrating a printing blade to condition print medium forward of the printing blade, wherein the printing blade is vibrated at at least one frequency in the range of from about 20 kHz to about 200 kHz and with a displacement of at least about 0.4 ?m.

A screen printing head for and method of printing deposits of a print medium onto a workpiece through apertures in a printing screen, the printing head comprising a vibration unit for vibrating a printing blade to condition print medium forward of the printing blade, wherein the printing blade is vibrated at at least one frequency in the range of from about 20 kHz to about 200 kHz and with a displacement of at least about 0.4 ?m.