How to avoid double arrow when drawing bended path

Question

I am drawing a graph where I need to connect two nodes with bended arrow line.

The problem is that instead of having single arrow on that bended line, I am getting two arrows. The arrow marked with red circle is the one I don't want. How to remove it?

\documentclass[a4paper,10pt]{article}
\usepackage{tikz}
\usetikzlibrary{shapes,arrows}    
\begin{document}
\tikzstyle{node}=[
    circle,
    inner sep=2.4mm,
    draw=black,
    line width=0.2mm,
]
\tikzstyle{linea}=[
    draw=black,
    line width=0.34mm,
    -triangle 60
]
\begin{tikzpicture}[y=-1cm]

\node (n1) at (1, 0.5) {};
\node (n2) [node] at (1, 2) {A};
\node (n3) [node] at (1, 4) {x};

\path [linea] (n1) -- (n2);
\path [linea] (n2) -- (n3);
\path [linea, bend left] (n3.west) edge (n2.west);

\end{tikzpicture}
\end{document}

Answer 1

Adaptations

• use \tikzset instead of \tikzstyle (see Should \tikzset or \tikzstyle be used to define TikZ styles?)
• add \usetikzlibrary{automata} and use option state for the nodes
• add \usetikzlibrary{positioning} for relative positioning
• minimized example
• added comparison between edge and to
  • see also tikz manual "17.12 Connecting Nodes: Using the Edge Operation"
  • "edge temporarily suspends the construction of the current path and a new path p is constructed" (red)
  • to adds stuff to the path (blue)
• If you want to use egde you shouldn't use draw (see lower image).
• If you want to use to you should use draw (see upper image).
• If you only need to connect two nodes, the usual way would be to use:

  \draw[linea] (a) to[bend right] (b); % with bend
  \draw[linea] (a) -- (b); % without bend
  

Result

Code

\documentclass[a4paper,10pt]{article}
\usepackage{tikz}
\usetikzlibrary{shapes, arrows, automata, positioning}
\begin{document}
\begin{tikzpicture}[
    linea/.style={
        draw,
        -triangle 60
    },
]
    \node [state] (a) {a};
    \node [state, right=of a] (b) {b};
    \node [state, right=of b] (c) {c};
    \path [linea, bend left, red] (a.north) edge (b.north) edge node[above]{\texttt{edge}} (c.north);
    \path [linea, blue, bend right] (a.south) to (b.south) to node[below]{\texttt{to}} (c.south);
\end{tikzpicture}
\verb|draw| and \verb|\path ...| = \verb|\draw ...|
\begin{tikzpicture}[
    linea/.style={
        -triangle 60
    },
]
    \node [state] (a) {a};
    \node [state, right=of a] (b) {b};
    \node [state, right=of b] (c) {c};
    \path [linea, bend left, red] (a.north) edge (b.north) edge node[above]{\texttt{edge}} (c.north);
    \path [linea, blue, bend right] (a.south) to (b.south) to node[below]{\texttt{to}} (c.south);
\end{tikzpicture}
no \verb|draw| and \verb|\path|
\end{document}