What is claimed is:
1. A rivet tool comprising:
a handle with a front slope formed in a front portion of the handle, the front slope defining a first through hole and having a protruding piece formed adjacent to the first through hole, the protruding piece defining a socket;
a lever pivotally connected to the handle;
a swivel head with a back slope to engage with the front slope of the handle, the back slope defining a second through hole to communicate with the first through hole, the swivel head having a collet tube with a riveting mechanism for receiving and deforming a blind rivet;
a hollow axle having a first end and a second end, the first end having a steering gear abutting the front slope and the second end securely connected to the back slope of the swivel head, and the hollow axle extending through the first through hole and the second through hole;
a slidable gear lock received in the socket of the protruding piece, the slidable gear lock having an inverted V-top and a tip of the inverted V-top, the tip meshed with the steering gear of the hollow axle and a spring to provide resilience to the slidable gear lock; and
a plate covering the socket to secure the slidable gear lock and the spring in the socket,
whereby the swivel head is able to be finely-adjustable with respect to the handle, the back-and-forth movement made by the tip of the slidable gear lock meshing the steering gear and the resilience of the spring can be as a complement to the tip of the slidable gear lock and the steering gear to prolong the operation life of the slidable gear lock, the steering gear and the rivet tool, and a clicking sound is made whenever the swivel head is rotated to inform a user.
2. The rivet tool as claimed in claim 1, wherein the second end of the hollow axle and the back slope of the swivel head are securely welded together.
3. The rivet tool as claimed in claim 1, wherein the second end of the hollow axle and the back slope of the swivel head are securely riveted together.
4. The rivet tool as claimed in claim 1, wherein the protruding piece and the front slope are integrally formed.
5. The rivet tool as claimed in claim 1, wherein the protruding piece and the front slope are securely welded together.
6. The rivet tool as claimed in claim 1, wherein the protruding piece and the front slope are securely riveted together.
7. The rivet tool as claimed in claim 1 further comprising a leaf spring mounted around the hollow axle and sandwiched between the steering gear and the front slope to occupy a gap between the steering gear and the front slope.
8. The rivet tool as claimed in claim 1 further comprising a washer mounted around the hollow axle and sandwiched between the front slope and the back slope to reduce rubbing therebetween.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A fusing device for an image forming apparatus, comprising:
a pair of roller members functioning as a fusing roller and a pressing roller, at least one of the roller members having an elastic layer on the peripheral surface thereof;
a pressing structure for bringing the roller members into press-contact with each other such that when a recording medium with an unfixed toner image formed thereon passes through the press-contact portion, the toner image is fused and fixed to the recording medium; and
a pressing structure regulator for regulating the pressing action of the pressing structure when the roller members are put into contact with each other by the pressing structure, the pressing structure regulator comprising a stationary element fixed to a frame of the fusing device, the stationary element limiting movement of a first one of the rollers members toward the second roller member.
2. The fusing device according to claim 1, wherein the pressing structure regulator is constituted by part of a frame structure of the fusing device for supporting one of the paired roller members, and regulates the pressing action of the pressing structure when the pressing structure is abutted to the part of the frame structure.
3. The fusing device according to claim 1, wherein the pressing structure regulator includes a pressure release member for releasing the press-contact state between the rollers by the pressing structure and a pressure release member regulator for regulating the movement of the pressure release member, and
the pressing action of the pressing structure is regulated by putting the pressure release member and the pressure release member regulator into contact with each other under the condition where the pressing structure and the pressure release member are in contact when the roller members are put into contact with each other by the pressing structure.
4. The fusing device according to claim 1, wherein with the roller members put in press-contact with each other by the pressing structure, the pressing structure regulator is adapted to create a necessary nip width for fusing toner images, by thermal expansion of the roller members when a fusing operation for fusing and fixing toner images to recording mediums is activated.
5. An image forming apparatus including a fusing device specified in claim 1.
6. The fusing device according to claim 1, wherein the stationary element is fixed to a non-moving portion of a frame of the fusing device.
7. The fusing device according to claim 1, wherein the pressing structure comprises:
a movable support frame upon which a first one of the roller members is mounted; and
at least one biasing member that biases the movable support frame in a direction that brings the first roller member into press-contact with the second roller member, and wherein the stationary element limits movement of the movable support frame toward the second roller member.
8. The fusing device according to claim 7, wherein the stationary element is fixed to a non-moving portion of a frame of the fusing device.
9. The fusing device according to claim 8, wherein the stationary element is a pin that extends from a non-moving portion of the frame of the fusing device, and wherein the pin is located such that it blocks movement of the movable support frame after the movable support frame has put the first roller member into press-contact with the second roller member.
10. A fusing device for an image forming apparatus, comprising:
a stationary frame;
a pair of roller members that are rotationally mounted on the frame and that function as a fusing roller and a pressing roller, wherein at least one of the roller members has an elastic layer on the peripheral surface thereof, and wherein a first one of the roller members can move into and out of press-contact engagement with the second roller member;
a pressing frame that is movably mounted on the stationary frame and that presses the first roller member into press-contact engagement with the second roller member;
at least one biasing member that biases the pressing frame in a direction that brings the first roller member into press-contact with the second roller member;
a pressure release lever mounted on the frame and that is movable between a first position and a second position, wherein when the pressure release lever is in the first position, the movable support frame can move to a position at which the first roller member is brought into press-contact with the second roller member, and wherein when the pressure release lever is in the second position, the pressure release lever holds the movable support frame in a position which results in the first roller member coming out of press-contact with the second roller member; and
a pressing structure regulator that includes a stationary element fixed to a non-moving portion of the stationary frame, wherein the stationary element holds the pressure release lever in the first position.
11. The fusing device according to claim 10, wherein the stationary element limits pivotal movement of the pressure release lever.
12. The fusing device according to claim 11, wherein the stationary element and the pressure release lever act together to limit movement of the pressing frame in a direction that brings the first roller member into press-contact with the second roller member.
13. An image forming apparatus comprising the fusing device of claim 10.