# US 9,518,348 B2 · Sewing machine having changeable presser foot

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- Number: US 9,518,348 B2
- Document ID: US9518348B2
- Status: Granted
- Kind: B2
- Application number: 14/747,415
- Filed: 2015-06-23
- Published: 2016-07-28
- Granted: 2016-12-13
- Earliest claimed: 2015-01-26
- Assignees: Janome Sewing Machine Co., Ltd.
- Applicants: Janome Sewing Machine Co., Ltd.
- Inventors: Muneyuki Ishikawa
- Web page: https://patentgrep.com/patent/US9518348B2

## CPC

- D05B 29/08: comprising relatively-movable parts
- D05B 29/06: Presser feet
- D05B 29/12: Presser-foot attachment
- D05D 2209/12: Metals or metal coatings
- D05B: SEWING (appliances for the tailoring trade A41H; sewing tables A47B29/00; sewing in bookbinding B42B2/00; sewing machines modified for knitting D04B39/08)
- D05D: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING

## Abstract

A presser foot has a rod pin and is received by an engagement groove provided with a presser holder. By measuring the resistance value of the rod pin, the rod pin is identified. Terminals are provided with the engagement groove, which contact the rod pin for measuring the resistance. The terminals are connected to a circuit that connects to a circuit of a presser bar. A receiving groove is formed at the presser holder, an inserting part is formed at the lower end of the presser bar, and the presser holder is connected to the presser bar by setting the inserting part in the receiving groove and fixing it. The terminals and the circuit are provided with the inserting part connecting to the electrical resistance measuring apparatus where the resistance of the rod pin is measured, then determination apparatus identifies the rod pin and a display informs the result.

## Claims

### Claim 1

A sewing machine having a changeable presser foot comprising:
A support member for supporting the presser foot,
A plurality of presser foots changeably adapted to attach to said support member,
An electrical resistance member provided with said each presser foot, each said electrical resistance member having a characteristic resistance value,
An electrical resistance measuring apparatus for measuring the resistance value of said electrical resistance member,
A determination apparatus for identifying the presser foot from the resistance value measured, and
A display for informing a result from the determination apparatus.

### Claim 2 (depends on 1)

The sewing machine according to claim 1, wherein said presser foot has a rod pin for being supported by said support member, and said electrical resistance member is the rod pin.

### Claim 3 (depends on 1)

The sewing machine according to claim 1, wherein said support member has a wire circuit for measuring the resistance value of the electrical resistance member.

### Claim 4 (depends on 2)

The sewing machine according to claim 2, wherein
said support member has an engagement groove for receiving said rod pin, a pair of spaced terminals provided in the engagement groove for contacting said rod pin, and a wire circuit connected to the terminals for measuring the resistance value.

### Claim 5 (depends on 1)

The sewing machine according to claim 1, wherein
said support member has a presser bar and a presser holder adapted to attach to the presser bar.

### Claim 6

A sewing machine having a changeable presser foot comprising:
A presser holder for supporting a presser foot in an attach/detach condition,
A presser bar for supporting the presser holder,
A plurality of presser foots changeably adapted to attach to the presser holder,
A rod pin provide with each presser foot having a characteristic electrical resistance value,
An engagement groove provided with said presser holder for receiving said rod pin,
A pair of spaced terminals provided in the engagement groove for contacting said rod pin,
A wire circuit for measuring the resistance value provided with said presser holder and presser bar and connected to said terminals,
An electrical resistance measuring apparatus for measuring the resistance value of said rod pin,
A determination apparatus for identifying the presser foot from the resistance value measured, and
A display for informing a result from the determination apparatus.