  Atomic masses of seven $T_z=-1$, $fp$-shell nuclei from $^{44}$V to $^{56}$Cu
and two low-lying isomers, $^{44m}$V ($J^\pi=6^+$) and $^{52m}$Co
($J^\pi=2^+$), have been measured with relative precisions of $1-4\times
10^{-7}$ with Isochronous Mass Spectrometry (IMS) at CSRe. The masses of
$^{56}$Cu, $^{52g,52m}$Co, and $^{44m}$V were measured for the first time in
this experiment. The Mass Excesses ($ME^{\prime}$s) of $^{44}$V, $^{48}$Mn,
$^{50}$Fe, and $^{54}$Ni are determined with an order of magnitude improved
precision compared to the literature values. $^{52g,52m}$Co and $^{56}$Cu are
found to be $370$~keV and $400$~keV more bound, respectively, while
$^{44g,44m}$V are $\sim 300$~keV less bound than the extrapolations in the
Atomic-Mass Evaluation 2012 (AME$^{\prime}$12). The masses of the four
$T_z=-1/2$ nuclei $^{45}$V, $^{47}$Cr, $^{49}$Mn, and $^{51}$Fe are
re-determined to be in agreement, within the experimental errors, with the
recent JYFLTRAP measurements or with the previous IMS measurements in CSRe.
Details of the measurements and data analysis are described, and the impact of
the new $ME$ values on different aspects in nuclear structure are investigated
and discussed.
