Back to results
US 6,405,666 B1Granted
Chain stitch sewing machine
OwnerJohannes Sahlinventor
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
OwnerJohannes Sahlinventor
Estimating the term…
The invention relates to a chain stitch sewing machine (1) having a needle bar (5) mounted in a housing (4) in such a way that it can be lifted and driven and at least one sewing needle (7, 8) that can be fixed on the needle head (6) of the needle bar (5), to which a sewing thread (12, 13) can be fed from a thread spool (14) by means of a tightener (15) and a thread guiding device (16), wherein the thread guiding device (16) comprises a thread takeup (17) controlling thread tension depending on the lift of the needle bar. In order to easily adapt the tension of the thread to the stitch operations during sewing, the thread takeup (17) consists of a feed disk (20) resting on a feed shaft (22) that can be driven synchronously relative to the drive mechanism of the needle bar (9), said disk forming an eccentric takeup cam (23) for receiving the thread on the side of the periphery and projecting ,with said takeup cam (23) in-between two thread eyelets (24, 25) fixed to the housing for the sewing thread (12, 13) that runs crosswise in relation to the feed disk (20) through the takeup cam (23) and/or a thread control device (18, 19) is mounted downstream of the thread takeup (17) for each sewing thread (12, 13), said thread control devices having a control disk (28, 29) resting on a control shaft (27) with a control cam (30, 31) mounted on the side of the periphery for the sewing threads (12, 13) which are guided through the thread eyelets (32, 33) that are fixed on the housing on both sides of the control disk (28, 29).
Chain stitch sewing machine having a needle bar mounted in a housing in such a way that it can be lifted and driven and at least one sewing needle which can be fixed on the needle head of the needle bar, to which a sewing thread can be fed by a thread spool by means of a tightener and a thread guiding device, whereby the thread guiding device comprises a thread takeup controlling the tension of the thread depending on the lift of the needle bar, characterised in that the thread takeup (17) consists of a feed disk (20) resting on a feed shaft (22) which can be driven synchronously relative to the drive mechanism of the needle bar (9), said disk forming an eccentric takeup cam (23) for receiving the thread on the side of the periphery and projecting with said takeup cam (23) in between two thread eyelets (24, 25) fixed to the housing for the sewing thread (12, 13) which runs crosswise in relation to the feed disk (20) through the takeup cam (23) and/or a thread control device (18, 19) is mounted downstream of the thread takeup (17) for each sewing thread (12, 13), said thread control devices having a control disk (28, 29) resting on a control shaft (27) with a control cam (30, 31) mounted on the side of the periphery for the sewing threads (12, 13) which are guided through the thread eyelets (32, 33) fixed on the housing on both sides of the control disk (28, 29).
Dependencies are inferred from the claim text.