EBS EBS-6100 User Manual

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EBS EBS-6100 User Manual Manual pdf 90 page image

EBS-6100 Printer User's Manual Paragraph 4 - Operating the Printer EBSInk-Jet Systems® 88 20070529#20.5The pulse frequency generated by the internal generator (and thereby the print rate) isinfluenced by two print parameters (available with the PRINTING PARAMETERS commandfrom the PRINTING submenu):´ The Cnv spd m/min (see section 4.4.3.5 Print Parameters) parameter adjusts the printrate (in rows) to the conveyor travel speed (m/min). If the setting of the Cnv spd m/minparameter does not change and you reduce the travel speed, the density of charactersprinted increases.The setting for the Cnv spd m/min parameter can be determined by measuring travelspeed with the CONVEYER MEASUREMENTS service command - see section4.4.4.11 Defining Some Print Parameters by Measuring Conveyor Travel Speed.´ The Resol. dot/cm (see section 4.4.3.5 Print Parameters) parameter defines imageresolution. The resolution is given as a number of dots/centimetre. The visual effect ofa change to the parameter is a change in the width of characters (graphic images) andthe length of the entire text file.NOTE:Extreme setting ranges are specified for Resol. dot/cm and Cnv spd m/min printparameters. The settings are monitored by the control program on an on-going basis andmay be limited by the settings of other print parameters and setting of the print height (7, 16,25 or 32 dots). The system is protected automatically against an excessive print rate setting.Therefore some settings may not be accepted.Below you can see a sample print "ABCD" which differs for various settings of theResol. dot/cm parameter; the travel speed is constant (NOTE: in order to make theoverprint legible, it is not shown to scale):Resol. dot/cm:24Resol. dot/cm:12Resol. dot/cm:6Rough measurements of the timing frequency (print rate) can be taken with theROWS SPEED command from the PRINTING submenu. The result of the measurementdepends on the settings of the Speed, Generator, Resol. dot/cm and Cnv spd m/min printparameters from PRINTING.4.6.2. Shaft-encoderThe shaft-encoder is an electromechanical indicator of rotary speed. The shaft-encoderaxle is coupled mechanically with an object that moves on a factory conveyor, for example.Pulses are generated at the shaft-encoder output. The pulse frequency is proportional to therotational speed of the axle. The pulses determine the moments at which rows of overprintsare to be printed. Therefore the pulse frequency depends on the travel speed, thetransmission ratio of a mechanical gear between the moving product, the shaft-encoder's axleand the type of encoder, i.e., the number of pulses per rotation. That is why an externalencoder is applied for timing when variable or unstable speed conveyors are used.!