1. A reciprocating tool driver comprising a housing having a tool-receiving aperture in which a tool may be detachably mounted for reciprocation along an axis, said aperture being in alignment with said axis of reciprocation of said tool, rotary drive means in said housing having a drive shaft positioned along said axis of reciprocation and a driving gear coupled to said drive shaft, said rotary drive means having a housing including a pair of spaced-apart arms each of which have a shaft-receiving aperture therein and both of which extend in a direction parallel to said axis of reciprocation on opposite sides of said axis of reciprocation, a shaft that passes through said gear and said shaft-receiving apertures, a driven gear assemblY including a driven gear mounted on said shaft and coupled to be driven by said driving gear, a cam eccentrically mounted on said driven gear assembly, a tool-holding means comprising a cam follower surrounding said gear shaft and engaging said cam, said toolholding means having a first surface and a second surface and being driven in a reciprocating direction along said axis of reciprocation by interaction of said cam and said cam follower, shaft support means on said housing for supporting the ends of said shaft, a hollow guide means having first and second plane guide surfaces which are parallel with respect to said axis of reciprocation, said first and second guide surfaces being adjacent to said first and second surfaces of said tool-holding means, respectively, said guide surfaces being positioned on opposite sides of said axis of reciprocation, at least one roller bearing race formed in said first surface of said tool-holding means and at least one roller bearing race formed in said second surface of said tool-holding means, a first roller bearing rolling in said first race in engagement with said first guide surface and a second roller bearing rolling in said second race in engagement with said second guide surface and guide support means for removably mounting said hollow guide means in said housing, said guide support means comprising a pair of outwardly extending arms on opposite sides of said guide means, a pair of support braces integrally formed with said housing for receiving said arms and a plurality of support ribs integrally formed with said housing for supporting said hollow guide means at positions remote from said arms.

1. A reciprocating tool driver comprising a housing having a tool-receiving aperture in which a tool may be detachably mounted for reciprocation along an axis, said aperture being in alignment with said axis of reciprocation of said tool, rotary drive means in said housing having a drive shaft positioned along said axis of reciprocation and a driving gear coupled to said drive shaft, said rotary drive means having a housing including a pair of spaced-apart arms each of which have a shaft-receiving aperture therein and both of which extend in a direction parallel to said axis of reciprocation on opposite sides of said axis of reciprocation, a shaft that passes through said gear and said shaft-receiving apertures, a driven gear assemblY including a driven gear mounted on said shaft and coupled to be driven by said driving gear, a cam eccentrically mounted on said driven gear assembly, a tool-holding means comprising a cam follower surrounding said gear shaft and engaging said cam, said tool-holding means having a first surface and a second surface and being driven in a reciprocating direction along said axis of reciprocation by interaction of said cam and said cam follower, shaft support means on said housing for supporting the ends of said shaft, a hollow guide means having first and second plane guide surfaces which are parallel with respect to said axis of reciprocation, said first and second guide surfaces being adjacent to said first and second surfaces of said tool-holding means, respectively, said guide surfaces being positioned on opposite sides of said axis of reciprocation, at least one roller bearing race formed in said first surface of said tool-holding means and at least one roller bearing race formed in said second surface of said tool-holding means, a first roller bearing rolling in said first race in engagement with said first guide surface and a second roller bearing rolling in said second race in engagement with said second guide surface and guide support means for removably mounting said hollow guide means in said housing, said guide support means comprising a pair of outwardly extending arms on opposite sides of said guide means, a pair of support braces integrally formed with said housing for receiving said arms and a plurality of support ribs integrally formed with said housing for supporting said hollow guide means at positions remote from said arms.

2. A tool holder for a reciprocating tool driver comprising a first generally rectangular section including an integrally formed driving shaft for imparting reciprocating motion to said tool holder and a second generally rectangular section removably securable to said first section to form a tool-holding enclosure, integrally formed hooks on one of said sections and integrally formed corresponding openings in the other of said sections for receiving said resilient hooks in interlocking engagement and an integrally formed resilient tab on one of said sections which extends into said tool-holding enclosure so as to press upon a tool inserted into said tool-holding enclosure in order to secure said tool in said tool holder.