Screen printing machine including exposure unit

A screen-printing machine, comprising:

• an exposure unit having a light transmitting top, a light below the top, and a frame member bordering the top, said frame member including a plurality of spaced apart locator pins that extend upwardly from said frame member and said frame member further including an end and an elongated tubular member having a center passageway opening at said end;
• a light transmitting, positive image carrier positionable on said light transmitting top, said positive image carrier including a plurality of locator pin openings in which the locator pins are received, said locator pins and said locator pin openings serving to position the positive image carrier in a predetermined position on the top of the exposure unit;
• a positive image positioned at a predetermined location on the positive image carrier;
• a printing screen positionable above the positive image carrier and on the top of the exposure unit;
• a common support for the exposure unit and the printing screen comprising a transverse frame member and an elongated arm connected to a central portion of the transverse frame member and extending from the transverse frame member into the center passageway of the elongated tubular member;
• the printing screen having an end member positioned contiguous with said transverse frame member;
• and
• a plurality of pins and sockets for detachably connecting the end member of the printing screen to the transverse frame member to allow the printing screen to be detached from the support and then reattached to the support at the same position that the printing screen previously occupied.

A screen-printing machine, comprising:

• an exposure unit having a light transmitting top, a plurality of spaced apart black lights and a plurality of spaced apart white lights each located below the top, reflectors below the black lights, and window openings in the reflectors located above the white lights, the exposure unit further comprising a frame member bordering the top, said frame member including a plurality of spaced apart locator pins that extend upwardly from said frame member;
• a light transmitting, positive image carrier positionable on said light transmitting top, said positive image carrier including a plurality of locator pin openings in which the locator pins are received, said locator pins and said locator pin openings serving to position the positive image carrier in a predetermined position on the top of the exposure unit;
• a positive image positioned at a predetermined location on the positive image carrier;
• a printing screen positionable above the positive image carrier and the exposure unit;
• a common support for the exposure unit and the printing screen;
• and
• a connector between the common support for the exposure unit and the printing screen which includes a detachable pin and socket connection adapted to allow the printing screen to be detached from the support and then reattached to the support at the same position that the printing screen previously occupied.

A screen-printing machine, comprising:

• an exposure unit having a light transmitting top, a light below the top, and a frame member bordering the top, said frame member including a plurality of spaced apart locator pins that extend upwardly from said frame member;
• a first light transmitting, positive image carrier positionable on said light transmitting top, said first positive image carrier including a plurality of locator pin openings in which the locator pins are received, said locator pins and said locator pin openings serving to position the first positive image carrier in a predetermined position on the top of the exposure unit;
• a first positive image positioned at a predetermined location on the first positive image carrier;
• a second light transmitting positive image carrier positionable on the first light transmitting positive image carrier, said second positive image carrier including a plurality of locator openings in which the locator pins are received, said locator pins and said locator pin openings serving to position the second positive image carrier in a predetermined position on top of the first positive image carrier and on top of the exposure unit;
• a second positive image positioned at a predetermined location on the second positive image carrier relative to the first positive image on the first positive carrier;
• a first printing screen and a second printing screen selectively positionable, one at a time, over the exposure unit;
• a common support for the first and second printing screens and the exposure unit, wherein each printing screen is positioned at a predetermined position on the exposure unit;
• and
• wherein said common support includes a frame and a printing screen support mounted on the frame for rotation about a vertical axis, said printing screen support comprising a connector for each printing screen, wherein each said printing screen is positioned on the support so as to be selectively and individually positionable above said exposure unit by rotation of the support.

A screen-printing machine, comprising:

• an exposure unit having a light transmitting top, a light below the top, and a frame member bordering the top, said frame member including a plurality of spaced apart locator pins that extend upwardly from said frame member;
• a light transmitting, positive image carrier positionable on said light transmitting top, said positive image carrier including a plurality of locator pin openings in which the locator pins are received, said locator pins and said locator pin openings serving to position the positive image carrier in a predetermined position on the top of the exposure unit;
• a positive image positioned at a predetermined location on the positive image carrier,
• three printing screens selectively positionable over the exposure unit, one at a time, in sequence;
• and
• a frame and a printing screen support mounted on the frame for rotation about a vertical axis, said printing screen support comprising a connector for each said printing screen, wherein each said printing screen is positioned on the support so as to be selectively and individually positioned above the exposure unit by rotation of the support.

A screen-printing machine, comprising:

• an exposure unit having a light transmitting top, a light below the top, and a frame member bordering the top, said frame member including a plurality of spaced apart locator pins that extend upwardly from said frame member;
• a light transmitting, positive image carrier positionable on said light transmitting top, said positive image carrier including a plurality of locator pin openings in which the locator pins are received, said locator pins and said locator pin openings serving to position the positive image carrier in a predetermined position on the top of the exposure unit;
• a positive image positioned at a predetermined location on the positive image carrier;
• a first printing screen positionable above the positive image carrier and the exposure unit;
• a common support for the exposure unit and the first printing screen;
• and
• a connector between the common support for the exposure unit and the first printing screen which includes a detachable pin and socket connection adapted to allow the first printing screen to be detached from the support and then reattached to the support at the same position that the printing screen previously occupied.

A screen-printing machine, comprising:

• an exposure unit having a light transmitting top, a light below the top, and a frame member bordering the top, said frame member including a plurality of spaced apart locator pins that extend downwardly from said frame member;
• a first light transmitting positive image carrier positionable on said light transmitting top, said first positive image carrier including a plurality of locator pin openings in which the locator pins are received, said locator pins and said locator pin openings serving to position the first positive image carrier in a predetermined position on the top of the exposure unit;
• a first positive image position at predetermined location on the first positive image carrier;
• a second light transmitting, positive image carrier positionable on the first light transmitting positive image carrier, said second positive image carrier including a plurality of locator pin openings in which the locator pins are received, said locator pins and said locator pin openings serving to position the second positive image carrier in a predetermined position on the top of the first positive image carrier and on top of the exposure unit;
• a second positive image positioned at a predetermined location on the second positive image carrier relative to the first positive image on the first positive image carrier;
• a first printing screen and a second printing screen selectively positionable, one at a time, over the exposure unit;
• a common support for the first and second printing screens and the exposure unit, wherein each printing screen is positioned at a predetermined position on the exposure unit, and
• a connector between the common support for the exposure unit each printing screen which includes a detachable pin and socket connection adapted to allow each printing screen to be detached from the support and then reattached to the support at substantially the same position that the printing screen previously occupied.