# US 5,708,926 A · Image heating apparatus with first and second elastic members

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- Number: US 5,708,926 A
- Document ID: US5708926A
- Status: Granted
- Kind: A
- Application number: 08/606,685
- Filed: 1996-02-26
- Granted: 1998-01-13
- Earliest claimed: 1993-02-08
- Assignees: Canon Kabushiki Kaisha
- Inventors: Seiji Sagara; Nobukazu Adachi
- Web page: https://patentgrep.com/patent/US5708926A

## CPC

- G03G 15/2064: {combined with pressure}
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

An image heating apparatus includes a first member; a second member for forming a nip in cooperation with the first member; a first frame for supporting the first frame a second frame connected to the first member frame rotation about a rotational axis; a first pressing member for pressing the second member toward the first member, away from the second frame; and a second pressing member for applying an additional pressure between the first and second frames so that an additional pressure is applied between the first and second member.

## Claims

### Claim 1

An image heating apparatus comprising:
a first member;
a second member for forming a nip in cooperation with said first member;
a first frame for supporting said first member;
a second frame connected to said first frame for rotation about a rotational axis;
a first elastic member having an elastic force for pressing said second member toward said first member from said second frame; and
a second elastic member for imparting pressure between said first frame and said second frame to increase the elastic force of said first elastic member, said second elastic member being located at a position away from said first elastic member in a direction away from said rotational axis.

### Claim 2 (depends on 1)

An apparatus according to claim 1, wherein said first elastic member and second elastic member are spring members.

### Claim 3 (depends on 1)

An apparatus according to claim 1, further comprising a lever for releasing the pressure between said first elastic member and said second elastic member.

### Claim 4 (depends on 1)

An apparatus according to claim 1, wherein said second member constitutes a heater used in a stationary state, and said heater forms a nip in cooperation with said first member, with a film which moves with a recording material being interposed.

### Claim 5

An image heating apparatus comprising:
a first member;
a second member for forming a nip in cooperation with said first member;
a first frame for supporting said first member;
a second frame connected to said first frame for rotation about a rotational axis;
a first elastic member for pressing said second member toward said first member from said second frame;
a second elastic member for imparting pressure between said first frame and said second frame to increase elastic force of said first elastic member; and
a lever for releasing the pressure between said first elastic member and said second elastic member, said lever being located at a position away from said second elastic member in a direction away from said rotational axis.

### Claim 6 (depends on 5)

An apparatus according to claim 5, wherein said second elastic member is located across said first elastic member from said rotational axis.

### Claim 7 (depends on 5)

An apparatus according to claim 5, wherein said first elastic member and second elastic member are spring members.

### Claim 8 (depends on 5)

An apparatus according to claim 5, wherein said second member constitutes a heater used in a stationary state, and said heater forms a nip in cooperation with said first member, with a film which moves with a recording material being interposed.

### Claim 9

An image heating apparatus comprising:
a first member;
a second member for forming a nip in cooperation with said first member;
a first frame for supporting said first member;
a second frame connected to said first frame for rotation about a rotational axis;
a first elastic member for pressing said second member toward said first member from said second frame; and
a second elastic member for imparting pressure between said first frame and said second frame.

### Claim 10 (depends on 9)

An apparatus according to claim 9, wherein said first elastic member and second elastic member are spring members.

### Claim 11 (depends on 9)

An apparatus according to claim 9, wherein said second member constitutes a heater used in a stationary state, and said heater forms a nip in cooperation with said first member, with a film which moves with a recording material being interposed.

### Claim 12 (depends on 1, 5)

An apparatus according to claim 1, 5, or 9, wherein said second frame is contacted to said first elastic member to bear against elastic force.

### Claim 13 (depends on 1, 5)

An apparatus according to claim 1, 5, or 9, wherein said first frame is fixed.

### Claim 14 (depends on 4, 8)

An apparatus according to claim 4, 8, or 11, wherein said first member includes a roller.

### Claim 15 (depends on 14)

An apparatus according to claim 14, wherein said roller is a driving roller.

### Claim 16 (depends on 1, 5)

An apparatus according to claim 1, 5, or 9, wherein said first member includes a heating roller, and said second member includes a pressing roller.

### Claim 17 (depends on 1, 5)

An apparatus according to claim 1, 5, or 9, wherein a recording material carrying an unfixed image is fed up by said nip, and the unfixed image is fixed by the feeding through the nip.