I. Nasch

Isador Nasch's 1887 UK patent follows closely in the footsteps of his contemporaries.
The specification describes both chain stitch and lockstitch versions of a portable miniature. The chain stitch machine (illustrated) incorporates a simple needle feed, akin to the "Oliver" and "Leader" patents. The lockstitch model, however, employs a more sophisticated cam driven motion to activate the needle feed.
Contemporary evidence suggests the machines did reach the marketing stage, but I have not come across a surviving example to date.

update:
Friends in Germany inform me that an extant Nasch type machine resides in a private European museum.