Image forming apparatus and driving mechanism for image holding member

An image forming apparatus, comprising:

• an image holding member;
• a drive source for driving the image holding member to rotate;
• and
• a drive transmission system for transmitting a drive force from the drive source to the image holding member, including at least two diverged drive transmission courses, each course being connected at a last stage thereof to a receiving member disposed on a rotating shaft of the image holding member,
• wherein the last stages of each drive transmission course and the receiving member respectively comprises two toothed wheels coaxially combined together.

A driving mechanism for rotating an image holding member, comprising:

• a drive source for driving the image holding member to rotate;
• a drive transmission system for transmitting a drive force from the drive source to the image holding member, including a first pair of gears comprised of a toothed wheel disposed on a rotating shaft of the image holding member and another toothed wheel engaged therewith;
• and
• a resistance giving mechanism for providing a resistance force to a rotation of the image holding member through a second pair of gears comprised of toothed wheels fabricated to have an identical configuration with that of the first pair of gears;
• wherein the toothed wheels of the second pair of gears are brought to engagement at a timing lagged by a given amount from that of the first pair of gears.

A driving mechanism for rotating an image holding member, comprising:

• a drive source for driving the image holding member to rotate;
• a drive transmission system for transmitting a drive force from the drive source to the image holding member, including a first pair of gears comprised of a toothed wheel disposed on a rotating shaft of the image holding member and another toothed wheel engaged therewith;
• a first resistance giving mechanism for providing a resistance force to a rotation of the image holding member through a second pair of gears comprised of toothed wheels fabricated to have an identical configuration with that of the first pair of gears;
• and
• a second resistance giving mechanism for providing a resistance force to the rotation of the image holding member through a third pair of gears comprised of toothed wheels fabricated to have an identical configuration with that of the first pair of gears,
• wherein the toothed wheels of the second pair of gears are brought to engagement at a timing lagged by half a pitch from that of the first pair of gears, and the toothed wheels of the third pair of gears are brought to engagement at a timing lagged by 180 degrees from that of the first pair of gears.

An image forming apparatus, comprising:

• an image holding member;
• a drive source for driving the image holding member to rotate;
• a drive transmission system for transmitting a drive force from the drive source to the image holding member, including a first pair of gears comprised of a toothed wheel disposed on a rotating shaft of the image holding member and another toothed wheel engaged therewith;
• and
• a resistance giving mechanism for providing a resistance force to a rotation of the image holding member through a second pair of gears comprised of toothed wheels fabricated to have an identical configuration with that of the first pair of gears,
• wherein the toothed wheels of the second pair of gears are brought to engagement at a timing lagged-by a given amount from that of the first pair of gears.

An image forming apparatus, comprising:

• an image holding member;
• a drive source for driving the image holding member to rotate;
• a drive transmission system for transmitting a drive force from the drive source to the image holding member, including a first pair of gears comprised of a toothed wheel disposed on a rotating shaft of the image holding member and another toothed wheel engaged therewith;
• a first resistance giving mechanism for providing a resistance force to a rotation of the image holding member through a second pair of gears comprised of toothed wheels fabricated to have an identical configuration with that of the first pair of gears;
• and
• a second resistance giving mechanism for providing a resistance force to the rotation of the image holding member through a third pair of gears comprised of toothed wheels fabricated to have an identical configuration with that of the first pair of gears,
• wherein the toothed wheels of the second pair of gears are brought to engagement at a timing lagged by half a pitch from that of the first pair of gears, and the toothed wheels of the third pair of gears are brought to engagement at a timing lagged by 180 degrees from that of the first pair of gears.

An image forming apparatus, comprising:

• an image holding member;
• a drive source for driving the image holding member to rotate;
• and
• a drive transmission system for transmitting a drive force from the drive source to the image holding member, including a pair of gears comprised of a first gear member consisting of two toothed wheels coaxially combined together with their teeth shifted by half a pitch in relation to each other, and a second gear member consisting of two toothed wheels respectively engaged with the two toothed wheels of the first gear member, and said two toothed wheels of the second gear member being coaxially combined together with their teeth shifted by half a pitch in relation to each other.

An image forming apparatus, comprising:

• an image holding member;
• a drive source for driving the image holding member to rotate;
• and
• a drive transmission system for transmitting a drive force from the drive source to the image holding member, including at least two diverged drive transmission courses, each course being connected at a last stage thereof to a receiving member disposed on a rotating shaft of the image holding member, wherein all of the last stages of each drive transmission course and the receiving member are toothed wheels, and wherein the last stage of each drive transmission course and the receiving member are engaged with each other with their teeth shifted by 1/n of a pitch in relation to each other when the number of diverged drive transmission courses is n.

An image forming apparatus, comprising:

• an image holding member;
• a drive source for driving the image holding member to rotate;
• and
• a drive transmission system for transmitting a drive force from the drive source to the image holding member, including at least two diverged drive transmission courses, each course being connected at a last stage thereof to a receiving member disposed on a rotating shaft of the image holding member, wherein the drive transmission system includes a central transmission member disposed coaxially with the rotating shaft of the image holding member, from which each of the drive transmission courses diverges, and wherein the last stages of each drive transmission course and the receiving member are friction rollers, and the central transmission member and each of the drive transmission courses are linked by a belt.

A driving mechanism for rotating an image holding member comprising:

• a drive source for driving the image holding member to rotate;
• and
• a drive transmission system for transmitting a drive force from the drive source to the image holding member, including at least two diverged drive transmission courses, each course being connected at a last stage thereof to a receiving member disposed on a rotating shaft of the image holding member;
• wherein the last stages of each drive transmission course and the receiving member respectively comprise n toothed wheels coaxially combined together, n being an integer more than one, and
• wherein the n two toothed wheels are combined together with their teeth shifted by 1/n of a pitch in relation to each other.

An image forming apparatus, comprising:

• an image holding member;
• a drive source for driving the image holding member to rotate;
• and
• a drive transmission system for transmitting a drive force from the drive source to the image holding member, including at least two diverged drive transmission courses, each course being connected at a last stage thereof to a receiving member disposed on a rotating shaft of the image holding member,
• wherein the last stages of each drive transmission course and the receiving member respectively comprise n toothed wheels coaxially combined together, n being an integer more than one, and
• wherein the n toothed wheels are combined together with their teeth shifted by 1/n of a pitch in relation to one another.

An image forming apparatus, comprising:

• an image holding member;
• a drive source for driving the image holding member to rotate;
• and
• a drive transmission system for transmitting a drive force from the drive source to the image holding member, including a pair of gears comprised of a first gear member consisting of n toothed wheels coaxially combined, n being an integer more than one, with their teeth shifted by 1/n of a pitch in relation to one another, and a second gear member consisting of n toothed wheels respectively engaged with the n toothed wheels of the first gear member, and said n toothed wheels of the second gear member being coaxially combined with their teeth shifted by 1/n of a pitch in relation to one another.