摘要:
It is possible to obtain a screen printing apparatus and a screen printing method wherein a high pressing force is not required to print paste on a substrate thereby assuring reliable printing qualities. In the screen printing apparatus which prints the paste on the substrate through pattern holes, the paste in a storage section is pressurized and forced out of a printing space portion through a transfer passage. The paste is given a rolling motion while it is guided by rolling guide surfaces disposed at the printing space portion, and then, the paste is filled into the pattern holes from a printing aperture formed by two scraping members.
摘要:
Pattern holes are completely filled with paste. As a result, occurrence of defects is prevented, and an excellent printing performance is obtained, high speed screen printing is possible, and the printing efficiency is enhanced. By sliding in the running direction above the mask plate having pattern holes, this squeegee for screen print can print the paste supplied on the mask plate to the substrate through the mask plate. It includes a contacting portion for contacting with the surface of the mask plate, a filling portion disposed at the running direction side of the contacting portion, and an agitating portion disposed at the running direction side of the filling portion. The agitating portion has a function of rotating the paste by sliding. The filling portion has a function of filling the pattern holes with the paste along with the sliding motion. The paste applied in the pattern holes can be printed on the substrate.
摘要:
The clearance ‘d’ between a substrate 3 and a mask 2 can be reduced at the time of the position recognition by horizontally offsetting two recognition devices 53,54 for recognizing the substrate 3 and the mask 2. Therefore, since the ascending stroke of the substrate 3 can be shortened at the time of the position alignment to contact the rear face of the substrate 3 with the rear face of the mask 2, the position misalignment of the substrate in the horizontal direction caused by the raising is suppressed. Accordingly, it is possible to suppress the reduction of the position alignment accuracy with the mask 2.
摘要:
The clearance ‘d’ between a substrate 3 and a mask 2 can be reduced at the time of the position recognition by horizontally offsetting two recognition devices 53,54 for recognizing the substrate 3 and the mask 2. Therefore, since the ascending stroke of the substrate 3 can be shortened at the time of the position alignment to contact the rear face of the substrate 3 with the rear face of the mask 2, the position misalignment of the substrate in the horizontal direction caused by the raising is suppressed. Accordingly, it is possible to suppress the reduction of the position alignment accuracy with the mask 2.
摘要:
Movable claws 13 are formed in clampers 10 holding a substrate 3 so that the movable claws can be selectively moved to a position where they have projected above the substrate 3, and to a position where they have retreated from above the substrate 3. Thereby, the safety of operation is ensured by causing the movable claws 13 to retreat during maintenance. Moreover, printing with high precision can be performed in a state where the surface of the substrate 3 and the rear face of the mask 2 are brought into surface contact with each other without any clearance by causing the movable claws 13 to retreat.
摘要:
A screen printing apparatus and a screen printing method facilitating to adjust a state of filling a paste. By adjusting a pneumatic pressure of pressing a squeezee 9a formed with a flexible region at at least a portion thereof to a surface of a mask 2, the squeezee 9a is moved up and down to follow recesses and projections of a surface of the mask 2 substantially in real time and an attack angle θ in sliding is maintained substantially constant. Thereby, a state of filling a paste can be stabilized without being influenced by recesses and projections of the surface of the mask 2 and promotion of a print quality can be expected. Further, bending is produced at the squeezee 9a by only adjusting the pneumatic pressure, and therefore, an attack angle θ in correspondence with a change in a print condition of a kind or a property of the paste, a thickness of the mask and the like can easily be changed.
摘要:
Movable claws 13 are formed in dampers 10 holding a substrate 3 so that the movable claws can be selectively moved to a position where they have projected above the substrate 3, and to a position where they have retreated from above the substrate 3. Thereby, the safety of operation is ensured by causing the movable claws 13 to retreat during maintenance. Moreover, printing with high precision can be performed in a state where the surface of the substrate 3 and the rear face of the mask 2 are brought into surface contact with each other without any clearance by causing the movable claws 13 to retreat.
摘要:
Prior to a mark imaging process executed for the purpose of detecting a position of recognition marks for positioning the substrate and the mask, an optical axis calibration processing process of detecting a horizontal relative position between imaging optical axes, and a surface correction data creation processing process of detecting a local positional deviation of the imaging optical axes, which is caused by the travel of the imaging unit, are executed. Before starting production, a production pre-start precision evaluation process for evaluating a substrate positioning precision is executed by using a verification substrate and a verification mask, and after starting the production, a production post-start precision evaluation process for evaluating a substrate positioning precision after starting the production is executed by using a commercial production substrate and a commercial production mask.
摘要:
A challenge to be met by the present invention is to provide a screen printer arranged so as to be able to readily perform both replacement of squeegees and operation for filling a paste feed syringe with paste. A paste feed syringe (14) is configured so as to be able to sway around an axial line (41) that downwardly extends from a squeegee base (30) with respect to a horizontal line (HL) parallel to a direction of reciprocal movement of the squeegee base (30), and also be able to change its position between a paste feed attitude having an imaginary extension within a vertical plane at an oblique angle such that a nozzle (14a) provided at a lower end of the paste feed syringe comes to a position immediately below squeegees (15) and a storage attitude which is turned from the paste feed attitude through about 90 degrees around an axial line (41).
摘要:
A fuel injection system for internal combustion engine of the spark ignition type is provided with a fuel metering apparatus including a fuel flow control orifice having an opening area or flow section which is varied in dependence upon a flow rate of intake air inducted into the engine. A fuel metered through the fuel metering apparatus is distributed by a distributing plate driven synchronously with the rate of revolutions of the engine at a predetermined rate and supplied intermittently and sequentially to individual cylinders of the engine through associated fuel injection valves by means of a pressure feeding apparatus such as plungers which are provided in number equal to that of the cylinder and driven synchronously with the revolution of the internal combustion engine.