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Atomic masses of seven $T_z=-1$, $fp$-shell nuclei from $^{44}$V to $^{56}$Cuand two low-lying isomers, $^{44m}$V ($J^\pi=6^+$) and $^{52m}$Co($J^\pi=2^+$), have been measured with relative precisions of $1-4\times10^{-7}$ with Isochronous Mass Spectrometry (IMS) at CSRe. The masses of$^{56}$Cu, $^{52g,52m}$Co, and $^{44m}$V were measured for the first time inthis experiment. The Mass Excesses ($ME^{\prime}$s) of $^{44}$V, $^{48}$Mn,$^{50}$Fe, and $^{54}$Ni are determined with an order of magnitude improvedprecision compared to the literature values. $^{52g,52m}$Co and $^{56}$Cu arefound to be $370$~keV and $400$~keV more bound, respectively, while$^{44g,44m}$V are $\sim 300$~keV less bound than the extrapolations in theAtomic-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 arere-determined to be in agreement, within the experimental errors, with therecent JYFLTRAP measurements or with the previous IMS measurements in CSRe.Details of the measurements and data analysis are described, and the impact ofthe new $ME$ values on different aspects in nuclear structure are investigatedand discussed.

Isochronous mass measurements of $T_z=-1$ $fp$-shell nuclei from projectile fragmentation of $^{58}$Ni