An apparatus, comprising: (a) an end effector comprising a staple driver, wherein the staple driver is operable to distally advance and proximally retract along the end effector; (b) a shaft assembly including a driver actuator (226, 326, 426) in communication with the staple driver, wherein the driver actuator (226, 326, 426) is operable to distally advance and proximally retract along a longitudinal axis of the shaft assembly such that motion of the driver actuator (226, 326, 426) provides distal advancement and proximal retraction of staple driver; and (c) a drive assembly (200, 300, 400) in communication with the driver actuator (226, 326, 426), wherein the drive assembly (200, 300, 400) comprises: (i) a motor (206, 306, 406), (ii) a rotary drive member (208, 308, 408) in communication with the motor (206, 306, 406), whereby the motor (206, 306, 406) is operable to rotate the rotary drive member (208, 308, 408), (iii) a first link (210, 310, 410) in communication with the rotary drive member (208, 308, 408), and (iv) a first toggle link (216, 316, 416) in communication with the first link (210, 310, 410), wherein the first toggle link (216, 316, 416) is also in communication with the driver actuator (226, 326, 426); (v) a mechanical ground (220, 320, 420); (vi) a second toggle link (218, 318,418) in communication with the first link (210, 310, 410), wherein the second toggle link (216, 316, 416) is also in communication with the mechanical ground (220, 320, 420); wherein rotation of the rotary drive member (208, 308, 408) is configured to induce linear motion in the first link (210, 310, 410), wherein the first link (210, 310, 410) is configured to pivot the second toggle link (218, 318, 418) in relation to the mechanical ground (220, 320, 420) and the first toggle link (216, 316, 416) in relation to the driver actuator (226, 326, 426), thereby straightening the first and second toggle links (216, 218, 316, 318, 416, 418) to convey linear motion to the driver actuator (226, 326, 426) that is non-parallel to the linear motion of the first link (210, 310, 410). (a) an end effector comprising a staple driver, wherein the staple driver is operable to distally advance and proximally retract along the end effector; (b) a shaft assembly including a driver actuator (226, 326, 426) in communication with the staple driver, wherein the driver actuator (226, 326, 426) is operable to distally advance and proximally retract along a longitudinal axis of the shaft assembly such that motion of the driver actuator (226, 326, 426) provides distal advancement and proximal retraction of staple driver; and (c) a drive assembly (200, 300, 400) in communication with the driver actuator (226, 326, 426), wherein the drive assembly (200, 300, 400) comprises: (i) a motor (206, 306, 406), (ii) a rotary drive member (208, 308, 408) in communication with the motor (206, 306, 406), whereby the motor (206, 306, 406) is operable to rotate the rotary drive member (208, 308, 408), (iii) a first link (210, 310, 410) in communication with the rotary drive member (208, 308, 408), and (iv) a first toggle link (216, 316, 416) in communication with the first link (210, 310, 410), wherein the first toggle link (216, 316, 416) is also in communication with the driver actuator (226, 326, 426); (v) a mechanical ground (220, 320, 420); (vi) a second toggle link (218, 318,418) in communication with the first link (210, 310, 410), wherein the second toggle link (216, 316, 416) is also in communication with the mechanical ground (220, 320, 420); wherein rotation of the rotary drive member (208, 308, 408) is configured to induce linear motion in the first link (210, 310, 410), wherein the first link (210, 310, 410) is configured to pivot the second toggle link (218, 318, 418) in relation to the mechanical ground (220, 320, 420) and the first toggle link (216, 316, 416) in relation to the driver actuator (226, 326, 426), thereby straightening the first and second toggle links (216, 218, 316, 318, 416, 418) to convey linear motion to the driver actuator (226, 326, 426) that is non-parallel to the linear motion of the first link (210, 310, 410). (i) a motor (206, 306, 406), (ii) a rotary drive member (208, 308, 408) in communication with the motor (206, 306, 406), whereby the motor (206, 306, 406) is operable to rotate the rotary drive member (208, 308, 408), (iii) a first link (210, 310, 410) in communication with the rotary drive member (208, 308, 408), and (iv) a first toggle link (216, 316, 416) in communication with the first link (210, 310, 410), wherein the first toggle link (216, 316, 416) is also in communication with the driver actuator (226, 326, 426); (v) a mechanical ground (220, 320, 420); (vi) a second toggle link (218, 318,418) in communication with the first link (210, 310, 410), wherein the second toggle link (216, 316, 416) is also in communication with the mechanical ground (220, 320, 420);