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SCREEN PRINTER PRINT ARM

IP.com Disclosure Number: IPCOM000022026D
Publication Date: 2004-Feb-19
Document File: 8 page(s) / 3M

Publishing Venue

The IP.com Prior Art Database

Abstract

A print arm for a screen printing machine of the type having radial print arms and radial pallet arms that rotate relative to the print arms the print arms being formed in at least two sections the first section extending radially from the centre of the printing machine and the second section attachable to said first section the second section having a support arm adapted to extend radially in a line parallel with the axis of the first section and an offset portion which attaches the second section to the first section so that the axis of the second section is displaced circumferentially from the axis of the first section. The which the print carriage is secured to one side of the print arm and moves reciprocally back and forth along the print arm. This allows easy access and improves the ease of changing the flood and squeegee bars. ¶

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SCREEN PRINTER PRINT ARM

Rotary Screen printing machines are used for screen printing of garments and utilise a plurality of fixed print heads beneath which are positioned a plurality of garment support pallets which are moveable from one print head to the next. Each print head has a carriage mounted for reciprocal movement to move the flood bar and squeegee bars over the screen.

The flood bar and squeegee blades in screen printing machines are mounted on a moving carriage with the flood bar down in the flood stroke and the squeegee down in the print stroke. The carriage is supported at both ends in a print frame and moves back and forth along the print frame.

USA patent 5189950 discloses a centrally mounted print arm supporting a central portion of the carriage for reciprocal movement along the print arm. The carriage is pneumatically driven along the arm. The raising and lowering of the flood and squeegee bars are pneumatically actuated with four actuators used two at each end of each of the flood and squeegee bars.

In all prior art rotary screen printers the print arms are radial straight beams with the print carriage suspended below the printarm. USA patent 5881641 discloses a screen printer with print and pallet arms that are in two parts hinged together to allow the arms to be folded up or down for transportation.

As the design of the rotary screen printing machines evolve ease of operation and reduction of operating costs are of increasing importance. Another desirable attribute is the ease with which screens and print carriage assemblies can be serviced and replaced.

Another development is that with some printing operations such as transfer printing and flocking the print arms of the printing machine need to be removed because the printing operation is carried out by an independent transfer heat press or flocking machines that is positioned at a printing station so that pallets can be rotated into position for flocking or transfer printing.

A print head assembly that addresses these needs comprises a print arm for a screen printing machine of the type having radial print arms and radial pallet arms that rotate relative to the print arms the print arms being formed in at least two sections the first section extending radially from the centre of the printing machine and the second section attachable to said first section the second section having a support arm adapted to extend radially in a line parallel with the axis of the first section and an offset portion associated with either the first or second sections which attaches the second section to the first section so that the axis of the second section is displaced circumferentially from the axis of the first section.

This results in the print arm lying above one side of the pallet in the printing position rather than above the centreline as is conventional with screen printing machines. This enables other printing operations such as flocking and transfer printing to be carried out wi...