Abstract: A driving unit drives an illuminating light. An image pick-up device reads a document in a main-scanning direction. An optical unit projects an image of the document onto the image pick-up device. An extracting unit extracts image signals at a plurality of points in the main-scanning direction of a first position and a second position in a sub-scanning direction. A document detecting unit creates binary data indicating a presence of the document at each of the points based on the image signals extracted. A size detecting unit determines a size of the document in the main-scanning direction based on a distribution of presence and absence of the document.

Abstract: An external device that is electrically connected to a main unit by a plurality of electric cables includes a first casing member storing a function unit; an external cover covering the first casing member; and a first space provided between the first casing member and the external cover. The electric cables are pulled out of the first casing member, bundled together, supported by the first casing member, and extended out of the external cover through the first space.

Abstract: A drive shaft, which is driven by a drive motor, is held firmly at two points by bearing structures. The bearing structure has a hole in which a bearing member is fit. The bearing member has hole, which is concentric with respect to the hole in which the bearing member is fit. A crimp, which is made of elastic material, having interfering portions that interfere with the bearing member is provided between the bearing member and the hole in the bearing structure in which the bearing member is fit.

Abstract: A drive unit including a drive shaft, a drive pulley attached to the drive shaft, and a drive wire driven by the drive pulley so as to move a movable body. The drive pulley is formed by press working or rolling.

Abstract: A driving unit drives an illuminating light. An image pick-up device reads a document in a main-scanning direction. An optical unit projects an image of the document onto the image pick-up device. An extracting unit extracts image signals at a plurality of points in the main-scanning direction of a first position and a second position in a sub-scanning direction. A document detecting unit creates binary data indicating a presence of the document at each of the points based on the image signals extracted. A size detecting unit determines a size of the document in the main-scanning direction based on a distribution of presence and absence of the document.

Abstract: An external device that is electrically connected to a main unit by a plurality of electric cables includes a first casing member storing a function unit; an external cover covering the first casing member; and a first space provided between the first casing member and the external cover. The electric cables are pulled out of the first casing member, bundled together, supported by the first casing member, and extended out of the external cover through the first space.

Abstract: A drive shaft, which is driven by a drive motor, is held firmly at two points by bearing structures. The bearing structure has a hole in which a bearing member is fit. The bearing member has hole, which is concentric with respect to the hole in which the bearing member is fit. A crimp, which is made of elastic material, having interfering portions that interfere with the bearing member is provided between the bearing member and the hole in the bearing structure in which the bearing member is fit.

Abstract: A drive shaft, which is driven by a drive motor, is held firmly at two points by bearing structures. The bearing structure has a hole in which a bearing member is fit. The bearing member has hole, which is concentric with respect to the hole in which the bearing member is fit. A crimp, which is made of elastic material, having interfering portions that interfere with the bearing member is provided between the bearing member and the hole in the bearing structure in which the bearing member is fit.

Abstract: An image reading apparatus having an optical system that moves via coated wires wherein the twisting or crisscrossing of the electric wires upon electrically connecting the optical system to the apparatus can be effectively prevented. To this end, an image reading apparatus reads the image of an original document through exposure scanning using the optical system mounted on a first carrier and a second carrier. Feeding cables with one end connected to a lamp of the first carrier and the other end connected to a regulator and a cable accommodating member that displaceably holds a portion of the feeding cables and is capable of sliding in the direction of an external force applied to the feeding cables are provided.

Abstract: This invention provides an image reading apparatus having high speed, small size and low cost, capable of reducing CPU load and capacity required for a memorizing table. The image forming apparatus including a reading portion for reading an image by scanning an original document, driving means for driving the reading portion, and memory means for storing therein a plurality of driving frequencies for enabling the driving means to switch to a variety of speeds and drive in a step by step manner, and for storing therein a table indicative of a switching point for switching one driving frequency of the plurality of driving frequencies to another driving frequency of the plurality of driving frequencies, wherein one driving frequency of the plurality of driving frequencies is switched to another driving frequency of the plurality of driving frequencies at the switching point.

Abstract: A cover plate for a document scanning device or an image forming apparatus of the present invention includes a frame connected to the body the image scanning device or that of the image forming apparatus. The frame is openable away from a glass platen and divided in a direction perpendicular to the opening/closing direction. A pressing portion presses the document laid on the glass platen. Mounting/dismounting members allow the pressing portion to be selectively mounted to or dismounted from the frame. An elastic member is included in the pressing portion and includes a sheet member mounted thereon and divided into a plurality of parts and configured to contact the document.

Abstract: The present invention realizes an image reading apparatus having an optical system that moves by means of coated electric wires wherein the twisting or crisscrossing of the electric wires upon electrically connecting the optical system to the apparatus can be effectively prevented. To this end, an image reading apparatus reads the image of an original document through exposure scanning using the optical system mounted on a first carrier and a second carrier. Feeding cables with one end connected to a lamp of the first carrier and the other end connected to a regulator and a cable accommodating member that displaceably holds a portion of said feeding cables and is capable of sliding in the direction of an external force applied to the feeding cables are provided.

Abstract: This invention provides an image reading apparatus having high speed, small size and low cost, capable of reducing CPU load and capacity required for a memorizing table. The image forming apparatus including a reading portion for reading an image by scanning an original document, driving means for driving the reading portion, and memory means for storing therein a plurality of driving frequencies for enabling the driving means to switch to a variety of speeds and drive in a step by step manner, and for storing therein a table indicative of a switching point for switching one driving frequency of the plurality of driving frequencies to another driving frequency of the plurality of driving frequencies, wherein one driving frequency of the plurality of driving frequencies is switched to another driving frequency of the plurality of driving frequencies at the switching point.

Abstract: A drive shaft, which is driven by a drive motor, is held firmly at two points by bearing structures. The bearing structure has a hole in which a bearing member is fit. The bearing member has hole, which is concentric with respect to the hole in which the bearing member is fit. A crimp, which is made of elastic material, having interfering portions that interfere with the bearing member is provided between the bearing member and the hole in the bearing structure in which the bearing member is fit.

Abstract: A cover plate for a document scanning device or an image forming apparatus of the present invention includes a frame connected to the body the image scanning device or that of the image forming apparatus. The frame is openable away from a glass platen and divided in a direction perpendicular to the opening/closing direction. A pressing portion presses the document laid on the glass platen. Mounting/dismounting members allow the pressing portion to be selectively mounted to or dismounted from the frame. An elastic member is included in the pressing portion and includes a sheet member mounted thereon and divided into a plurality of parts and configured to contact the document.

Abstract: A drive unit including a drive shaft, a drive pulley attached to the drive shaft, and a drive wire driven by the drive pulley so as to move a movable body. The drive pulley is formed by press working or rolling.