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Frister & Rossmann was founded in 1864 in Berlin by Gustav Rossmann and Robert Frister. [2] [3]The UK importer was sued by the Singer company in 1883. [4]The company became Germany's largest sewing machine manufacturer, until 1902.
A sewing machine thus electrified now fit entirely inside a woman-portable carrying case. Electric motors became so common that Singer made provision for them: the model 127/128 'modernized' versions included mounting lugs for a motor, whereas earlier models had to be drilled and tapped.
[1] Machine components such as the print cylinder, doctor blade assembly, printing plates, stress/friction and more, affect the registration of the machine. [2] Inconsistencies among these components can cause the printing press to fall out of registration; that is when press operators will begin to see defects in their print.
The Criticality Index is often used to determine the degree on condition monitoring on a given machine taking into account the machines purpose, redundancy (i.e. if the machine fails, is there a standby machine which can take over), cost of repair, downtime impacts, health, safety and environment issues and a number of other key factors. The ...
A free arm houses the machine's feeder and bobbin driver in a tubular arm-shaped bed, enabling material to be wrapped around the mechanism during sewing rather than simply resting on top of it. A free arm greatly simplifies sewing tasks like darning and hemming on delicate fabrics and difficult-to-reach seams—uses for which Elna was heavily ...
A patent illustration of the Osann portable sewing machine. A typical early 20th century sewing machine, like the Singer 27, was designed to be mounted in a treadle or table, and though reduced-size models with hand cranks and wooden cases were introduced, their weight strains the meaning of the word 'portable.'
Vibrating shuttle machines reciprocate their shuttle through a short arc. The earliest vibrating shuttles used boat-shaped shuttles, but bullet-shaped shuttles soon replaced them. The design was popularized in the White Sewing Machine Company's 'White Sewing Machine' and Singer's 27-series machines. [5] Now obsolete. [6]
Horizontal misalignment is misalignment of the shafts in the horizontal plane and vertical misalignment is misalignment of the shafts in the vertical plane: Offset horizontal misalignment is where the motor shaft is moved horizontally away from the pump shaft, but both shafts are still in the same horizontal plane and parallel. [citation needed]