EC-PACK EC-JET 1000Pro, Руководство пользователя, Страница: 107 / 120

Guangzhou EC-PACK Packaging Equipment Co., Ltd.
EC-JET 1000Pro Continuous Inkjet Printer
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The screened conductor should be connected to the shell of the D - Type connector and to the printer
chassis at the printer end of the cable (it must not be connected to 0 volts).
CAUTION: EMC performance may be compromised by the use of unsuitable shaft encoders. Use only
EC-JET approved accessories.
1.7.2 Selecting the Encoder, Gearing, and Print Width
When using a shaft encoder it is vitally important that the calculations are followed and the print width is
computed based on the geometry of the set up. If guessed at, messages will not be printed at the
required size; raster will be printed too close together or too far apart.
The calculations take you through a series of steps as shown below. There is also a worked example and
a problem solving section afterwards.
Step 1: Define the required raster pitch for the application.
Step 2 :Select the encoder, gearing and pitch factor that gives an actual raster pitch close to that
required.
Step 3 :Check the calculated print performance (size and speed) is adequate.
Step 4: Calculate the print width from the pitch factor and enter it.
Step 5: Check print samples for performance.
Step 1: Define the Required Raster Pitch for the Application
For each raster type on each printhead type there is a drop pitch which gives the best quality print, i.
e. 1:1 aspect ratio at the default printer settings. This value is known as the ideal pitch; a table later in the
section lists them. For a particular application you may want to choose a
different pitch, bearing in mind that the aspect ratio can be adjusted using the
Print Height setting (see “Changing the System Setup”).
The required raster pitch is calculated by:
Required raster pitch (mm)
Printed Length (mm)
Number of Characters x Character Width (rasters)
Printed Length (mm)
Number of Rasters in Message
Where:
Printed length = length of message on product. This must be less than the length of any area left clear for
printing.
Number of characters = number of characters in the longest line of the message.
Character width = number of rasters in each character; see the following table.
(Alternatively, obtain the number of rasters in the message by creating the message on the printer and
noting the x-position of the cursor just after the end of the message.)
The character width varies with the size of character chosen. The figures in the table include the gaps
between characters; this will introduce a small error as the gap after the last character is not printed.