EP0033647A2 — Cleaning device for an electrostatic copying appa…

Claim 1

Independent Claim 90 words

A cleaning device for a transfer type electrostatic copying apparatus which comprises magnetic brush cleaning means for cleaning off a maqnetizable toner remaining of a photosensitive material after transfer, comprisina : a hair brush roller disposed between the magnetic brush cleaning means and a transfer zone, and havinq a construction that a hair brush is filled on a peripheral surface of a cylindrical member of light transmitting material and driven for rotation and is in contact with the photosensitive material; and a charge eraser lamp secured within the cylindrical member.

Claim 2

Dependent Claim 90 words

A cleaning device for a transfer type electrostatic copying apparatus which comprises magnetic brush cleaning means for cleaning off a maqnetizable toner remaining of a photosensitive material after transfer, comprisina : a hair brush roller disposed between the magnetic brush cleaning means and a transfer zone, and havinq a construction that a hair brush is filled on a peripheral surface of a cylindrical member of light transmitting material and driven for rotation and is in contact with the photosensitive material; and a charge eraser lamp secured within the cylindrical member.

Claim 3

Dependent Claim 46 words

A cleaning device for a transfer type electrostatic copying apparatus according to claim 1, the hair brush is filled on the peripheral surface of the cylindrical member to form a light transmitting portion allowing light from the charge eraser lamp to pass onto the photosensitive material.

Claim 4

Dependent Claim 61 words

A cleaning device for a transfer type electrostatic copying apparatus according to claim 1 or 2, in which the hair brush roller is driven to rotate with respect to the photosensitive material at such a rotational speed that possible damage to the surface of the photosensitive material, or scattering of the remaining developing material over the photosensitive material is advantageously prevented.

Claim 5

Dependent Claim 40 words

A cleaning device for a transfer type electrostatic copying apparatus according to claim 1, 2 or 3, in which the cylindrical member is made of a material capable of cutting off light havin q wavelenqht adversely affecting the photosensitive material.

Claim 6

Dependent Claim 32 words

A cleaning device for a transfer type electrostatic co p yinq apparatus according to claim 1, 2, 3 or 4, in which the hair brush is made of a electrically conductive material.

Claim 7

Dependent Claim 159 words

A cleaning device for a transfer type electrostatic copying apparatus according to claim 1, in which the magnetizable developing material remaining on the photosensitive material being cleaned off by a magnetic brush, the bristle lenqth of which is restricted by means of a restricting member, there are further provided: a rotary shaft disposed upstream of a rotational direction of the magnetic brush with respect to the restricting member, and driven to rotate around an axial line parallel with a rotational axial line of the maqne- tic brush; transporting means of non-magnetic material for transporting a remaing developing material restricted bv the restricting member in a rotation of the transportina means and secured to the rotary shaft at a right anale, a developing material receptacle for receivina the developing material falling from the transportina means when the transportina means rotates downwardly having an opening facing upwardly on the opposite side of the magnetic brush with respect to the rotary shaft.

Claim 8

Dependent Claim 51 words

A cleaning device for a transfer type electrostatic copying apparatus according to claim 1, in which there are further provided a switching means for alternating a switching mode in accordance with the weight of the developing material stored in a developinq material receptacle when the weight is reached a predetermined value.

Claim 9

Dependent Claim 134 words

A developing device for an electrostatic copying apparatus in which a permanent magnet having a plurarity of magnetic poles magnetized at each equal space in a peripheral direction of the permanent magnet is coaxially secured in a hollow developing sleeve made of non-magnetic material and driven to rotate, a one-component maanetizable toner is supplied on the developing sleeve so as to form a magnetic brush, and a bristle cutting member restricts a length of the magnetic brush, characterized in that there is provided a blade member made of non-magnetic material, disposed upstream along the rotational direction of the developing sleeve at the vicinity of the bristle cutting member, inclining to separate from the peripheral surface of the developing sleeve downstream along the rotational direction, and contacting with the peripheral surface of the developing sleeve.

Claim 10

Dependent Claim 134 words

A developing device for an electrostatic copying apparatus in which a permanent magnet having a plurarity of magnetic poles magnetized at each equal space in a peripheral direction of the permanent magnet is coaxially secured in a hollow developing sleeve made of non-magnetic material and driven to rotate, a one-component maanetizable toner is supplied on the developing sleeve so as to form a magnetic brush, and a bristle cutting member restricts a length of the magnetic brush, characterized in that there is provided a blade member made of non-magnetic material, disposed upstream along the rotational direction of the developing sleeve at the vicinity of the bristle cutting member, inclining to separate from the peripheral surface of the developing sleeve downstream along the rotational direction, and contacting with the peripheral surface of the developing sleeve.

Claim 11

Dependent Claim 93 words

A developing device for an electrostatic copying apparatus according to claim 8, in which the neighboring magnetic poles are directed to have alternately opposite polar orientation, the magnetic poles formed at a magnetized posotion facing the bristle cutting member and a magnetized position contacting with the blade member are neighboring and opposite polarization to each other, the blade member has a construction so as to allow the one-component magnetizable toner pass at about central position between the magnetic pole facing the bristle cutting member and the magnetic pole contacting with the blade member.

Claim 12

Dependent Claim 34 words

A developing device for an-electrostatic copying apparatus according to claim 8 or 9, in which the magnetized position contacting with the blade member has a pair of neighboring magnetic poles with the same polarization.

Claim 13

Dependent Claim 53 words

A developing device for an electrostatic copying apparatus according to claim 8 or 9, a single of magnetized position of the permanent magnet has a pair of neighboring magnetic poles with the same polarization in an area from a developing zone to the blade member along the rotational direction of the developing sleeve.

Claim 14

Dependent Claim 55 words

12 . A developing device for an electrostatic copyin a apparatus according to claim 8 or 9, plurality of magnetized positions of the parmanent magnet has a pair of neighboring magnetic poles with the same polarization in an area from the developing zone to the blade member along the rotational direction of the developing sleeve.

Claim 15

Dependent Claim 217 words

A developing device for an electrostatic copyina apparatus according to claim 8, in which the developing material is supplied onto a developing roller havin q the developing sleeve disposed in the vicinity of a photosensitive material, there are further provided, a storage container having a bottom formed in an arcuate-shape and extending downwardly, and having a supply port opening for supply the developing material onto a peripheral surface of the developing roller, a rotary shaft provided rotatably around the center of the arcuate bottom of the storage container, a stirring and feeding means for stirring the developing material in the storage container to supply to the supply port, and extending radially from the rotary shaft to the vicinity of the inner surface of the bottom of the storaae container, a ratchet wheel secured to the rotary shaft axially, a rocking lever having one end supported by a pin parallel to the rotary shaft, having the other end enaaging to associate with the developing roller, and swingable around the pin in accordance with the rotational motion of the developing roller, and a claw disposed on the immediate portion of the rocking lever to engage with teeth of the ratchet wheel, and for driving to rotate the ratchet wheel in accordance with the swing motion of the rocking lever.

Claim 16

Dependent Claim 196 words

A developing device for an electrostatic copying apparatus according to claim 8, in which there is provided a presence-detecting device for detecting the developing material comprising; a detecting member made of non-magnetic material, swingable about a horizontal axis in a vertical plane with respect to an axis of the developing sleeve between a first angular position corresponding to a substantially central position of neighboring N pole and S pole of the permanent magnet at a vicinity of the developing sleeve in accordance with the depressing force of the magnetizable toner attracted by the permanent magnet and a second angular position far from the developing sleeve in accordance with the own weight of the detectiong member against the depressing force of the developing material, disposed between the developing sleeve and an supply port of a developing material storaae container for storing the developing material and for supplying the developing material to the developing sleeve, an engaging member swingable about a horizontal axis formed integrally the detecting member, and switching means having an actuator engaging with the engaqinq member for changina switching modes in responsive to the first and second an q ular positions of the detecting member.

Cleaning device for an electrostatic copying apparatus

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