Cloth presser mechanism with rack and pinion needle rod-drive

• US 4,915,044 A
• Filed: 04/17/1989
• Issued: 04/10/1990
• Est. Priority Date: 06/07/1988
• Status: Expired due to Fees

• Current Assignee: Singer PLC (Hayleys Plc)
• Original Assignee: SSMC, Inc.
• Inventors: Tajima, Masao, Kobayashi, Hideyuki, Kambara, Tetsuo
• Primary Examiner(s): Falik, Andrew M.
• Application Number:
  US07/338,669
• Time in Patent Office: 358 Days
• Field of Search: 112/311, 112/98, 112/221, 112/236, 112/443, 112/235
• US Class Current: 112/236
• CPC Class Codes: D05B 29/02 Presser-control devices
• CPC Class Codes: D05B 55/14 Needle-bar drives

Abstract

A cloth presser mechanism comprises a cloth presser vertically movably supported by an arm of a sewing machine. A needle bar is vertically movably supported by the arm of the sewing machine and has a needle at the lower end thereof. The mechanism further includes a rack fixed to the needle bar, a pinion rotatably supported by the arm of the sewing machine and engaged with the rack, a cam integral with the pinion, a first link having an end pivotally supported by the arm of the sewing machine and a middle portion connected to a roller which rides on the surface of the cam, and a second link having an end pivotally supported by the cloth presser. The other end of the second link is pivotally connected to the other end of the first link.

Claims

1. A cloth presser mechanism adapted for connection to the arm of a sewing machine and comprising a cloth presser vertically movably supported by said arm;

a needle rod vertically movably supported by said arm having a needle at the lower end thereof;

a rack secured to the needle rod;

a pinion rotatably supported by the arm of the sewing machine and engaged with the rack;

a cam integral with the pinion;

a first link having a first end pivotally mounted on the arm of the sewing machine, a middle portion and a second end;

a second link having one end pivotally supported by the cloth presser and an opposite end pivotally connected to the second end of the first link; and

means connected to the middle portion of the first link and engaging the surface of the cam.

2. The mechanism as set forth in claim 1 wherein said means is a roller.

3. The mechanism as set forth in claim 2 further including a vertical cloth presser bar supported at an upper end to said arm;

a cloth presser member having an upper end coupled to the lower end of the bar and a lower end with a needle hole therein, the hole being positioned so that the needle can pass therethrough.