Abstract:
An electrostatic printing device wherein powder ink (44) is rubbed into a screen (40) having a predetermined print pattern (41) formed thereon and a voltage is applied between the screen (40) and a printing subject (100), thereby causing the powder ink (44) to adhere to the printing subject (100), the device comprising a soft open−cell urethane sponge brush (42) for rubbing the powder ink (44) into the screen (40), and a hard open−cell urethane sponge brush (43) for scraping off the powder ink solidified on the surface of the screen (40).
Abstract:
The invention concerns a capillary doctor blade with surface injection for liquid product (4) screen printing with viscous liquids on a substrate (1) through the orifices of a silkscreen (2). Said self-contained element is adaptable on direct transfer devices comprising a reservoir capable of being pressurised with a length corresponding to the substrate to be screen printed. The surface injection doctor blade comprises an elastically deformable capillary element (16) in contact with the silkscreen (2), preventing the product natural flow (4) when it is not subjected to the pressure (F2) and which allows a product flow matching the application requirements when the product is under pressure. Scraping lips (6a and 6b) oppositely inclined ensure that the device is sealed at the front and at the rear of the injection surface (10) while the ends are sealed by sealing foam blocks. The invention also concerns a work method for said surface injection capillary doctor blade.
Abstract:
A method and device for carrying out the deposition of a viscous and/or pasty product on a substrate (1) through the apertures (3) of a stencil are provided. A hollow receptacle (7) for the product is provided with a lower aperture (19) which is orientated towards the stencil. The lower aperture (19) of the receptacle is delimited such that its length is adjusted to the dimensions of the substrate and that its width is a function of the speed of execution of the screen printing. This delimitation is implemented by sealing members (15, 16) preferably comprising two wipers (15) on respective sides of the aperture, transverse with respect to the direction of displacement of the receptacle, orientated one towards the other and inclined with respect to the horizontal between the wipers at an angle of between 120 DEG and 180 DEG , said wipers being transversal and intersecting with the section of the receptacle. A pressure is exerted upon the viscous product in the receptacle, which pushes it towards the stencil between the wipers to distribute it, and upon the wipers, applying pressure to these in order to push the wipers onto the stencil. The receptacle is displaced across the stencil at the same time as the pressure is being exerted on the product. The invention can be applied in the electronics industry for carrying out depositions of adhesive or soldering paste.
Abstract:
A method of transferring material (12) to a substrate (13) comprises loading material (12) into one or more apertures of a material carrier (11) and directing fluid, preferably air jets (14), towards the material carrier (11) to transfer material (12) loaded in one or more of the apertures to the substrate (13). The material carrier (11) includes a plurality of apertures for receiving material (12), and these may be defined by a plurality of interconnected wire portions in the form of a mesh. Alternatively, the material carrier (11) may include a body, the apertures being in the form of conduits (18) extending through the body.
Abstract:
A wiper blade (6) for screen printing comprising a web of synthetic material to be mounted adjacent one longitudinal edge thereof on a print head (1), extending towards a screen and having a leading angle during a printing operation, the wiper blade (6) having, at the other longitudinal edge thereof, a metallic reinforcing member (12) which also acts as a wear strip and contacts the screen during the printing operation. A print head for a screen printer is also described.
Abstract:
A manufacturing system (10) and method for applying a material (48) to a workpiece (12) comprising a blade unit (20) having a blade element (16) for selectively moving along first (40) and second (22) axes for applying the material (48) to the workpiece (12). A reciprocating motor (42) is coupled to the blade unit (20) for reciprocating the blade element (16) along the first axis (40) concurrent with movement of the blade element (16) along the second axis (22), and a vibration detector (80) is coupled to the blade unit (20) for detecting the vibrational movement of the blade element (16). The vibration detector (80) generates an output signal corresponding to the vibrational movement of the blade element (16). A control unit (44) is coupled to the vibration detector (80) for generating an output signal in response to the vibration detector signal, and a regulating device (46) adjusts a parameter of the reciprocating motor (42) in response to the output signal of the control unit (44).