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US 4,848,254 AGranted
Sewing machine with multidirectional upper and lower feed devices
AssigneePfaff Industriemaschinen GmbH
InventorsFritz Krowatchek, Horst Zinnsmeister
Life of this patent
Estimating the term…
Abstract
A sewing machine is provided with a upper and a lower feed device with which a workpiece consisting of several plies can, when making arched and/or corner type seams, be transported in always constant position of orientation without mutual displacement of the plies. For this purpose the feed direction of both feed devices can be varied either by changing their direction of action or by geometric addition of at least two motion components.
Claims6
A sewing machine comprising:
- an upper workpiece feed device including an upper feed dog;
- a lower workpiece feed device including a lower feed dog;
- an upper feed drive connected to said upper feed dog including a longitudinal feed mechanism driving said upper feed dog in a longitudinal direction and an upper transverse feed mechanism for driving said upper feed dog in a transverse direction;
- a lower feed drive connected to said lower feed dog including a lower longitudinal feed mechanism for driving said lower feed dog in a longitudinal direction and a lower transverse feed mechanism for driving said lower feed dog in a transverse direction;
- and, a control means, said control means including a first setting device connected to said lower transverse feed mechanism and a second setting device connected to said upper transverse feed mechanism, said first setting device varying the feed direction of said lower feed device by setting the amount of feed of the lower feed dog in the transverse direction and said second setting independently controllable from said first setting device for device varying the feed direction of said upper feed device by setting the amount of feed of the upper feed dog in the transverse direction.
2 more elements
A sewing machine comprising:
- an upper driven roller presser for moving a workpiece in a feed direction;
- a lower driven feed wheel for moving a workpiece in a feed direction;
- said feed wheel and said roller presser each being mounted so as to pivot about a common vertical axis and each of said feed wheel and said roller presser being connected with a swivel mechanism;
- and, control means for varying the feed direction of each of the upper driven feed wheel and the lower driven roller presser.
1 more element
A sewing machine comprising:
- an upper feed device including a driven roller presser;
- a lower feed device including a feed dog;
- and, control means for varying the feed direction of each of the upper feed device and lower feed device, said control means including a setting device connected with said feed dog for actuating said feed dog in a transverse feed movement, and said roller presser being coupled to a swivel mechanism, said swivel mechanism being mounted to pivot about a vertical axis.
Dependencies are inferred from the claim text.