Method and apparatus for controlling pushing pressure applied to printing material
AssigneeFuji Machine Mfg. Co., Ltd.
InventorsTakeyoshi Isogai, Jun Adachi, Tatsumi Saito, Manabu Mizuno
Life of this patent
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Abstract
A method of method of controlling a pushing pressure which is applied to a printing material, such as a creamed solder, to push the material out of a printing head of a screen printing apparatus and print the material on an object, such as a printed wiring board, through at least one through-hole of a screen of the apparatus while at least one of the head and the screen is moved relative to the other of the head and the screen in a direction parallel to the screen, the method comprising the step of changing the pushing pressure applied to the printing material, while a printing operation is carried out on the object by the screen printing apparatus.
Claims16
A method of controlling a pushing pressure which is applied to a printing material, such as a creamed solder, to push the material out of a printing head of a screen printing apparatus and print the material on an object, such as a printed wiring board, through a plurality of through-holes of a screen of the apparatus while at least one of the head and the screen is moved relative to the other of the head and the screen in a direction parallel to the screen, the method comprising the step of:
- changing the pushing pressure applied to the printing material to push the printing material out of the printing head and print the printing material on the object through the through-holes of the screen, while a printing operation is carried out on the object by the screen printing apparatus,
- wherein the step of changing the pushing pressure comprises changing the pushing pressure according to a predetermined pressure pattern representing a relationship between relative position of the printing head and the screen, and pressure, said relationship including at least two distinct pressure values corresponding to at least two distinct relative positions of the printing head and the screen, respectively.
A screen printing apparatus for printing a printing material on an object through a screen having a plurality of through-holes, comprising:
- a printing head which includes (A) a printing-material container having (a1) a printing-material chamber in which the printing material is accommodated, and (a2) a printing-material outlet which communicates with the printing-material chamber and opens toward the screen, and (B) a printing-material pushing device which applies a pushing pressure to the printing material accommodated in the printing-material chamber to push the material out of the chamber;
- a moving device which moves at least one of the printing head and a combination of the screen and the object relative to the other of the head and the combination, in a direction parallel to the screen;
- and
- a pushing-pressure control device which controls the pushing pressure applied to the printing material by the printing-material pushing device and which changes the pushing pressure applied to the printing material to push the printing material out of the printing-material chamber, while a printing operation is carried out on the object by the screen printing apparatus,
- wherein the pushing-pressure control device comprises a pattern-using control portion which changes the pushing pressure applied to the printing material according to a predetermined pressure pattern representing a relationship between relative position of the printing head and the screen, and pressure, said relationship including at least two distinct pressure values corresponding to at least two distinct relative positions of the printing head and the screen, respectively.
A method of controlling a pushing pressure which is applied to a printing material to push the material out of a printing head of a screen printing apparatus and print the material on an object through a plurality of through-holes of a screen of the apparatus while at least one of the head and the screen is moved relative to the other of the head and the screen in a direction parallel to the screen, the method comprising the step of:
- changing the pushing pressure applied to the printing material to push the printing material out of the printing head and print the printing material on the object through the through-holes of the screen, while a printing operation is carried out on the object by the screen printing apparatus,
- wherein the step of changing the pushing pressure comprises pushing, at a first relative position of the printing head and the screen, the printing material at a first pressure value, and pushing, at a second relative position of the printing head and the screen, the printing material at a second pressure value smaller than the first pressure value, the printing material being less easily squeezed into at least one of the through-holes of the screen at said first relative position than at said second relative position.
A screen printing apparatus for printing a printing material on an object through a screen having a plurality of through-holes, comprising:
- a printing head which includes (A) a printing-material container having (a1) a printing-material chamber in which the printing material is accommodated, and (a2) a printing-material outlet which communicates with the printing-material chamber and opens toward the screen, and (B) a printing-material pushing device which applies a pushing pressure to the printing material accommodated in the printing-material chamber to push the material out of the chamber;
- a moving device which moves at least one of the printing head and a combination of the screen and the object relative to the other of the head and the combination, in a direction parallel to the screen;
- and
- a pushing-pressure control device which controls the pushing pressure applied to the printing material by the printing-material pushing device and which changes the pushing pressure applied to the printing material to push the printing material out of the printing-material chamber, while a printing operation is carried out on the object by the screen printing apparatus,
- wherein the pushing-pressure control device controls the printing-material pushing device to push, at a first relative position of the printing head and the screen, the printing material at a first pressure value, and push, at a second relative position of the printing head and the screen, the printing material at a second pressure value smaller than the first pressure value, the printing material being less easily squeezed into at least one of the through-holes of the screen at said first relative position than at said second relative position.
Dependencies are inferred from the claim text.