直ちに means "immediately", "at once", with no delay at all. It goes in front of the verb and belongs to official language: instructions, announcements, news reports, written rules.
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If there is an earthquake, evacuate immediately.
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The police received the call and went to the scene at once.
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This problem needs to be dealt with immediately.
直ちに or すぐに
is the everyday word for "right away". 直ちに means the same, but sounds official and urgent, so in conversation it comes across as stiff or comic.
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Report to the scene immediately.
"Not automatically" with a negative
With or , 直ちに means "directly", "automatically": the second thing does not simply follow from the first. The first half is usually , "just because".
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Just because something is expensive doesn't mean the quality is good.
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Making an effort doesn't automatically bring results.
Lingaku