1. A toner conveying unit comprising:
a first toner conveying passage that includes a receiving port in an inner wall of the first toner conveying passage and that guides toner to fall down from the receiving port;
a second toner conveying passage that joins a lower portion of the first toner conveying passage through a toner collecting port;
a conveying member that is provided in the second toner conveying passage and that conveys the toner in a predetermined direction while rotating;
a crank that is provided in the second toner conveying passage below the first toner conveying passage and that is connected to the conveying member; and
a vertical slide member that includes:
a crank connecting unit that is connected to the crank, and
a spiral body that is inserted into the first toner conveying passage, and that is formed so as to come into slide contact with the inner wall of the first toner conveying passage,
wherein a length of the spiral body is smaller than a distance between the receiving port and the toner collecting port.
2. The toner conveying unit according to claim 1, further comprising a driving source that is connected to the conveying member,
wherein the conveying member is rotated by a driving force that is obtained from the driving source,
wherein the crank and the vertical slide member reciprocate in a vertical direction, and
wherein the vertical slide member slides on an inner wall surface of the first toner conveying passage so as to scrape off the toner.
3. The toner conveying unit according to claim 2, wherein the driving source includes a rotational drive gear.
4. The toner conveying unit according to claim 1, wherein the conveying member includes any one of a shape of a coil and a rotating shaft with spiral fins fixed to an outer peripheral surface of the rotating shaft.
5. The toner conveying unit according to claim 1, comprising a plurality of first toner conveying passages,
wherein the plurality of first toner conveying passages include vertical drum-toner conveying passages that are disposed so as to correspond to drum cleaners for a plurality of photoreceptor drums, respectively and that guide toner discharged from the drum cleaners to the second toner conveying passage, and a vertical belt-toner conveying passage that guides toner discharged from a belt cleaner for a transfer belt to the second toner conveying passage.
6. The toner conveying unit according to claim 5, wherein the photoreceptor drums are provided in a cyan image forming unit, a magenta image forming unit, a yellow image forming unit, and a black image forming unit, respectively.
7. The toner conveying unit according to claim 1,
wherein the conveying member, which includes a rotating shaft around which spiral fins are fixed, and a plurality of the cranks are alternately connected to each other,
wherein the crank includes a shaft that is not formed on an extended line of the rotating shaft of the conveying member and that is positioned parallel to the rotating shaft, and
wherein the crank includes a handle that connects the shaft to the rotating shaft.
8. The toner conveying unit according to claim 1, further comprising: a toner storage container that collects the toner conveyed through the second toner conveying passage in the predetermined direction.
9. The toner conveying unit according to claim 8, wherein the toner storage container is detachably provided.
10. The toner conveying unit according to claim 8, wherein toner, which passes through the first toner conveying passage and the second toner conveying passage, is waste toner, and toner stored in the toner storage container is waste toner.
11. The toner conveying unit according to claim 1, wherein the length of the spiral body is smaller than the distance between the receiving port and the toner collecting port, by a distance which is substantially equal to a vertical stroke of the crank.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. A refrigerant composition which comprises at least one polyoxyalkylene glycol derivative represented by the general formula:
R1(OR2)mOR3n
wherein R1 is a methyl group, R2 is a propylene group, R3 is a methyl group, n is an integer of 1 and m is an integer of 12 to 80 and 1,1,1,2-tetrafluoroethane; said derivative having a kinematic viscosity of 5 to 50 cSt at 100 C.
2. A refrigerant composition comprising a polyoxyalkylene glycol derivative of ethyleneoxide-propyleneoxide copolymer represented by the general formula:
R6OAR7
wherein R6 and R7 are each an alkyl group having 1 to 3 carbon atoms and A is a copolymerization chain of ethyleneoxide and propyleneoxide consisting of p-times ethyleneoxide units and q-times propyleneoxide units, and p and q are numbers satisfying the requirements:
0.1pq3, 14pq100
and 1,1,1,2-tetrafluoroethane; said derivative having a kinematic viscosity of 5 to 50 cSt at 100 C.
3. A refrigerant composition according to claim 2, wherein R6 and R7 are each a methyl group.