Presser bar guide
First Claim
1. In a sewing machine that comprises a loop-taker, a head spaced from the looptaker and having a round channel facing generally towards the looptaker, and a presser bar that extends longitudinally through the channel, presser bar support and guide means comprising:
- a hollow presser bar guide bushing comprising a first portion adjacent a first end of the bushing, the first portion having a circularly cylindrical outer surface that extends through and substantially fills the channel, and a second portion between the first portion and the opposite end of the bushing;
a shoulder surface on said bushing extending outwardly beyond said channel at the end of the first portion proximal to the second portion;
guide means in the bushing to guide the presser bar for longitudinal movement relative to the bushing;
a first threaded sleeve at the end of the first portion of the bushing within the head and substantially coaxial with the axis of the first portion;
a helical tension spring, one end of which is screwed onto the first threaded sleeve to be held thereby with the axis of the helical spring substantially coincident with the axis of the first portion of the cylindrical outer surface of the bushing; and
attachment means attached to one end of the presser bar within the head and comprising a second threaded sleeve, the other end of the tension spring being screwed onto the second threaded sleeve to be held thereby with the axis of the second threaded sleeve coincident with the axis of the first threaded sleeve, wherein the tension spring pulls the shoulder surface of the bushing against the head.
2 Assignments
0 Petitions
Accused Products
Abstract
A hollow bushing (22 or 54) that guides a presser bar (21) to move in a longitudinal direction is threaded at one end (29 and 30). The outer surface of that end is round and, below the thread (59), fits closely but rotatably in a channel (32) in the head (16) of a sewing machine. The bushing is not fixedly held in place in the channel (32). Instead, a tension spring (33) screwed onto the threaded end and onto a threaded member (37) attached to the end of the presser bar (21) within the head (16) pulls the presser bar downwardly so that its foot (24) normally presses against the work (46) and simultaneously pulls the bushing (22 or 54) toward the head (16). A shoulder surface (27 or 58) at a certain location on the bushing (22 or 54) acts as a stop to limit the extent that the cylinder can be drawn into the head. The spring (33) is fully screwed onto the threaded sleeves (30 and 36) until the ends of the spring butt against surfaces (34 and 40), eliminating operator-adjusted presser foot pressure and simiplying the presser foot pressure mechanism.
7 Citations
4 Claims
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1. In a sewing machine that comprises a loop-taker, a head spaced from the looptaker and having a round channel facing generally towards the looptaker, and a presser bar that extends longitudinally through the channel, presser bar support and guide means comprising:
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a hollow presser bar guide bushing comprising a first portion adjacent a first end of the bushing, the first portion having a circularly cylindrical outer surface that extends through and substantially fills the channel, and a second portion between the first portion and the opposite end of the bushing; a shoulder surface on said bushing extending outwardly beyond said channel at the end of the first portion proximal to the second portion; guide means in the bushing to guide the presser bar for longitudinal movement relative to the bushing; a first threaded sleeve at the end of the first portion of the bushing within the head and substantially coaxial with the axis of the first portion; a helical tension spring, one end of which is screwed onto the first threaded sleeve to be held thereby with the axis of the helical spring substantially coincident with the axis of the first portion of the cylindrical outer surface of the bushing; and attachment means attached to one end of the presser bar within the head and comprising a second threaded sleeve, the other end of the tension spring being screwed onto the second threaded sleeve to be held thereby with the axis of the second threaded sleeve coincident with the axis of the first threaded sleeve, wherein the tension spring pulls the shoulder surface of the bushing against the head. - View Dependent Claims (2, 3, 4)
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Specification