JP2005324939A - Pressing plate spring, document image reader, transferred body feeder, and image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressing plate spring capable of carrying a document and a transferred body while preventing skew from occurring by a simple structure without allowing a holding shaft to be co-rotated by a co-rotating roller even at low cost, a document image reader having the pressing plate spring, a transferred body feeder having the pressing plate spring, and an image forming device having the pressing plate spring. <P>SOLUTION: This pressing plate spring comprises a plate-shaped pressing plate spring body 1, a claw part 2 formed at the end part of the pressing plate spring body 1, and a projected face 5 of projected shape formed by projecting to the holding surface side edge part of the claw part 2 holding a shaft 4 rotatably holding the co-rotating roller 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pressure plate spring, a document image reading apparatus including the pressure plate spring, a transfer medium feeding apparatus including the pressure plate spring, and an image forming apparatus including the pressure plate spring. Specifically, a plate-shaped pressure plate spring that grips and pressurizes a shaft that rotatably holds the follower roller, and a document image reading that reads the document image of the document that is transported with the pressure plate spring Apparatus, transferred object feeding apparatus that separates and feeds the transferred objects placed and provided with the pressure plate spring, and a document image reading apparatus provided with the pressure plate spring Charging, writing, developing, transferring, and cleaning by an inkjet printer such as a printing apparatus that forms an image on a transferred material fed from a document feeding device or an electrophotographic method. Copier for forming a toner image by repeating the image forming process such as an grayed, facsimile apparatus, printer or an image forming apparatus such as a complex machine of this like.

Conventionally, in a pressure plate spring, a document image reading apparatus including the pressure plate spring, a transfer medium feeding apparatus including the pressure plate spring, and an image forming apparatus including the pressure plate spring , A pressing roller that applies pressing force through a shaft that rotatably holds a driving roller for transporting an original or transfer paper against a transport roller that transports the document or transfer paper to a separation unit, reading unit, or transfer unit. A leaf spring is used that is arranged on the left and right with respect to the center.
In the conveying roller device, the press roller is disposed so as to face the drive roller, and is pressed by a leaf spring, and the leaf spring is formed in a substantially U-shape, on both sides of the roller with respect to the press roller support shaft. The leaf spring is fixed to the frame with a fixing screw, and the pressing force is adjusted by changing the degree of tightening of the adjustment screw. It is well known that the pressing force on the left and right sides of the roller is adjusted by tightening with an adjusting screw so that inconvenience such as oblique feeding does not occur on the conveyed paper (see Patent Document 1). ).
During standby, the bent portion of the leaf spring is separated from the roller by a predetermined amount, the contact end portion contacts the roller at a contact position in front of the nip position in the document transport direction, and the document is inserted into the gap between the roller and the bent portion. Is rotated counterclockwise, the contact end moves in the document transport direction due to the frictional force with the roller, the bent portion moves in the roller direction and presses the document against the roller, and the document is transported to the nip position by the roller. When the leading edge of the original comes to this contact position, the frictional force with the leaf spring decreases, and the leaf spring is bent by the elastic force. When the final document has been transported away from the roller, the roller is rotated clockwise and the bent part is far away from the roller, so that the originals can be separated and transported properly. Transport device It is known (see Patent Document 2).

8 to 10 show a document image reading device 110 that automatically conveys a document (O) to an image reading unit such as a copying machine or a facsimile machine. The document (O) placed on the document setting unit 110a is shown in FIG. Then, a roller 103 (103a) for pressing and conveying the original (O) to the conveying roller 105 that conveys the original to the original separating unit 111, and the original (O) to the reading unit of the original image reading unit 112 by resist conveyance The accompanying roller 103 (103b) for pressing and conveying the original (O) to the conveying roller 106 to be conveyed needs to be rotated around the conveying roller 105 and the conveying roller 106, and the accompanying rollers 103a and 103b need to be rotated. The left claw 102b and the right claw 1 of the claw portion 102 provided on the pressure leaf spring body 101 of the pressure leaf spring 100 disposed on the left and right are centered on 2c, left claw 102b, right claw 102c, left claw 102b, right claw 102c, left claw 102b provided on the shaft 104a gripped by the central claw 102a disposed opposite to the right claw 102c A pressing pressure is applied via the shaft 104b gripped by the claw 102b and the central claw 102a, and at the same time, the device rotates with the shaft 104a and the shaft 104b at the same time. .
However, the shaft 104 a and the shaft 104 b are connected to the left claw 102 b, the right claw 102 c, the center claw 102 a, and the pressure leaf spring body 101 provided on the pressure leaf spring body 101. Since the left claw 102b, the right claw 102c, and the central claw 102a provided are held only by the elastic force, if the pressing force applied to the respective conveyance rollers 105 and 106 is increased, the follower rollers 103a and 103b are increased. In other words, the document is skewed.
Therefore, a conventional pressure plate spring, a document image reading apparatus including the pressure plate spring, a transfer medium feeding apparatus including the pressure plate spring, and an image forming apparatus including the pressure plate spring. However, it is said that the gripping shaft rotates with the roller at an indefinite period, and skew is generated on the transfer paper of the document or the transferred material, resulting in poor conveyance. There was a bug.
JP 2002-220133 A JP-A-9-290938

  Therefore, an object of the present invention is to solve such problems. That is, a pressure leaf spring capable of transporting a document or a transfer target body while preventing the occurrence of skew without causing the gripping shaft to be moved by the follower roller even at a low cost with a simple configuration, and It is an object of the present invention to provide a document image reading apparatus including the pressure plate spring, a transfer medium feeding apparatus including the pressure plate spring, and an image forming apparatus including the pressure plate spring.

In order to achieve the object, the present invention according to claim 1 is a plate-shaped pressure leaf spring that grips and presses a shaft that rotatably holds a follower roller, and a plate-shaped pressure leaf spring body; It consists of a claw part formed at the end of the pressure plate spring body and a convex convex surface that protrudes from the edge part on the gripping surface side that grips the shaft that rotatably holds the follower roller of the claw part. The most important feature is the pressure leaf spring.
Alternatively, the present invention described in claim 2 is characterized in that, in the pressure leaf spring according to claim 1, the claw portions are pressure leaf springs formed at both ends of the pressure leaf spring main body.
Alternatively, according to a third aspect of the present invention, in the pressure leaf spring according to the first or second aspect, the claw portion includes a central claw and a left claw and a right claw formed on the left and right sides of the central claw. The main feature is a pressure plate spring.
Alternatively, the present invention described in claim 4 is the pressure leaf spring according to claim 1, 2 or 3, wherein the convex surface is a warped surface formed in the step of removing the pressure leaf spring body. It is a major feature.
Alternatively, according to a fifth aspect of the present invention, in the pressure leaf spring according to the fourth aspect, the warped surface is a predetermined surface formed on the gripping surface side that grips the shaft that rotatably holds the follower roller of the claw portion. The main feature is a pressure leaf spring having a curved surface with a radius.
Alternatively, according to a sixth aspect of the present invention, in the pressure leaf spring according to the first, second or third aspect, the convex surface is a pressure leaf spring comprising a bent end surface formed in a bending step of the pressure leaf spring body. It is a major feature.

Alternatively, the present invention according to claim 7 is the pressure fracture spring according to claim 1, 2 or 3, wherein the convex surface has a fracture surface formed in a punching bending process of the pressure leaf spring body. The main feature is a pressure leaf spring made of
Alternatively, according to the present invention, in a document image reading apparatus that reads a document image of a document to be conveyed, a document separation unit that separates the conveyed document one by one and a document separation unit A document image reading device comprising a document image reading unit that reads a document image of a document that is separated and conveyed to a reading unit, and a pressure plate spring according to any one of claims 1 to 7. Features.
Alternatively, in the present invention according to claim 9, in the transferred object feeding apparatus for separating and feeding the transferred objects to be transferred one by one, the mounted transferred objects are separated one by one. A transfer member separating unit, a transfer member conveying unit that conveys a transfer member separated one by one by the transfer member separating unit, and a pressure leaf spring according to any one of claims 1 to 7. The most important feature is that the transferred object feeding apparatus is.
According to another aspect of the present invention, there is provided an image forming apparatus that forms an image on a transferred body fed from a transferred body feeding apparatus using original scanned image data read by an original image reading apparatus. An image forming apparatus including an image forming unit that forms an image and the pressure leaf spring according to any one of claims 1 to 7 is the main feature.
Alternatively, the present invention according to claim 11 is the image forming apparatus according to claim 10, wherein the image forming unit is an image forming apparatus that forms a toner image in an image forming process of an electrophotographic method. Features.

Since the present invention is configured as described below, according to the first aspect of the present invention, even if the configuration is simple and the cost is low, the gripping shaft does not follow the follower roller and the document. In addition, it is possible to provide a pressure leaf spring capable of transporting the transfer object while preventing the occurrence of skew.
According to the second aspect of the present invention, even if the configuration is simple and the cost is low, the document and the transfer target can be transported while preventing the skew from occurring without the gripping shaft being moved by the follower roller. It is now possible to provide a pressure leaf spring that can
According to the third aspect of the present invention, even if the configuration is simple and the cost is low, the document and the transfer target can be skewed without the shaft that is reliably and stably gripped by the simple configuration being moved by the rotation roller. It has become possible to provide a pressure leaf spring that can be transported while preventing generation.
According to the fourth aspect of the present invention, even if the configuration is simple and the cost is low, the shaft gripped by the warped surface is not carried by the follower roller, and the document and the transferred object are conveyed while preventing the occurrence of skew. It is now possible to provide a pressure leaf spring that can be used.
According to the fifth aspect of the present invention, the sliding resistance corresponding to the pressing pressure can be set even with a simple configuration and at a low cost. It has become possible to provide a pressure leaf spring that can transport a document or a transfer medium while preventing the occurrence of skew without causing the shaft gripped by the surface to follow the roller.

According to the sixth aspect of the present invention, even if the configuration is simple and the cost is low, the shaft gripped by the bent end face is not carried by the follower roller, and the document and the transferred object are conveyed while preventing the occurrence of skew. It is now possible to provide a pressure leaf spring that can be used.
According to the seventh aspect of the present invention, even if the configuration is simple and low in cost, the shaft gripped by the bent fracture end face does not follow the follower roller and prevents the document or the transferred object from being skewed. It has become possible to provide a pressure leaf spring that can be transported.
According to the eighth aspect of the present invention, even if the configuration is simple and low cost, the pressure leaf spring capable of transporting the document while preventing the skew from occurring without the gripping shaft being moved by the follower roller. It is possible to provide a document image reading apparatus that reads a document image of a document that is conveyed.
According to the ninth aspect of the present invention, even if the configuration is simple and the cost is low, the transfer target can be transported while preventing the occurrence of skew without the gripping shaft being moved by the follower roller. It has become possible to provide a transferred material feeding apparatus that separates and feeds a transferred material placed with a pressure plate spring.
According to the tenth aspect of the present invention, even if the configuration is simple and the cost is low, the gripping shaft is not moved by the follower roller, and the document or the transferred object is conveyed while preventing the occurrence of skew. It is possible to provide an image forming apparatus that includes a pressure leaf spring that can form an image and forms an image.
According to the eleventh aspect of the present invention, even if the configuration is simple and the cost is low, the gripping shaft is not moved by the follower roller, and the document or the transfer target is conveyed while preventing the occurrence of skew. It is now possible to provide an image forming apparatus that includes a pressure leaf spring that can form a high-quality toner image at high speed.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a front view of a main part of a pressure plate spring according to an embodiment of the present invention and a document image reading apparatus including the pressure plate spring. FIG. 2 is a left side view of one pressure plate spring shown in FIG. FIG. 4 is a bottom view of the other pressure leaf spring of FIG. 1, and FIG. 4 is a cross-sectional view taken along the line AA of FIG. In each figure, a document image reading device 10 that reads a document image of a document to be conveyed, a transfer material feeding device 20 (not shown), or a shaft that rotatably holds a follower roller in an image forming device 50 (not shown) is gripped. The plate-shaped pressure leaf spring 0 to be pressed grips the plate-shaped pressure leaf spring body 1, the claw portions 2 formed at both ends of the pressure leaf spring body 1, and the rotating shaft 4 of each follower roller 3. In order to achieve this, a curved surface 5a of a convex-shaped convex surface 5 is formed so as to protrude from the edge of each claw portion 2 on the gripping surface side. It is possible to prevent the occurrence of skew in the transfer sheet of the document (O) or the transfer target (P) without being accompanied by the follow-up roller 3 that is carried by the conveying roller 6 due to sliding resistance with the warped surface 5a. Can be transported.
As shown in FIG. 1, the pressure leaf spring 0 has a claw portion 2 that supports the accompanying rollers 3 a and 3 b that are brought together with the conveying rollers 6 a and 6 b.
The claw portions 2 formed at both ends of the pressure leaf spring main body 1 are composed of a central claw 2a, and left and right claws 2b and 2c formed opposite to the central claw 2a on both the left and right sides of the central claw 2a.
The pressure leaf spring 0 is further inexpensive because the claw portions 2 are formed at both ends of the pressure leaf spring main body 1 to grip the shaft 4.

The claw portion 2 includes a central claw 2a formed to face the left claw 2b and the right claw 2c, and reliably holds the shaft 4 with a simple configuration.
The left claw 2b and the right claw 2c are warped by a convex surface 5 having a convex shape that protrudes from the outer edge on the gripping surface side that grips the shafts 4a and 4b that rotatably hold the swivel rollers 3a and 3b. A surface 5a is formed (see FIG. 4).
The central claw 2a is also formed with a warped surface 5a of a convex surface 5 which is formed to protrude from both inner and outer edges on the gripping surface side that grips the shafts 4a and 4b (see FIG. 4). .
Further, the warping surface 5a can be easily formed at a low cost by setting the clearance between a punch and a die (not shown) wider in consideration of the pulling direction in the pulling process of the pressure leaf spring body 1. .
The left claw 2b, the right claw 2c, and the left claw 2b on the holding surface side that holds the shaft 4a, 4b of the central claw 2a formed to face the left claw 2b and the right claw 2c are bent at one corner of the right claw 2c. A surface 5b is formed, and warped surfaces 5a having a predetermined radius (R) are formed at both corners of the central claw 2a.
The curved surface 5b is formed on the die side (not shown) in consideration of the pulling direction so that the warped surface 5a is formed on the gripping surface side for gripping the shafts 4a and 4b in the punching process of the pressure leaf spring body 1. A curved shape with a predetermined radius (R) is provided on the cutting blade, and it can be easily formed at low cost.
Therefore, by changing the predetermined radius (R), it becomes possible to set the sliding resistance corresponding to the pressing pressure, and by controlling the rotation of the gripping shafts 4a and 4b, the document (O) or Thus, it is possible to provide a pressure leaf spring 0 capable of transporting a transfer sheet (P) to be transferred while preventing skew.

The conveyance roller 6 a and the conveyance roller 6 b are disposed so as to be rotationally driven by a base (not shown) of the document image reading apparatus 10.
A cover (not shown) of the document image reading apparatus 10 facing the transport roller 6a and the transport roller 6b is a pressure plate having a left claw 2b, a right claw 2c, and a central claw 2a at both ends of the pressure plate spring body 1. Springs 0 are arranged on the left and right.
The shaft 4a into which the follower roller 3a is inserted easily and the shaft 4b into which the follower roller 3b is inserted easily are elastic between the left claw 2b, the right claw 2c and the center claw 2a. It is gripped with force.
The base and cover (not shown) of the document image reading device 10 are fixed by a fixing claw (not shown), whereby the follower roller 3a is pressed against the carry roller 6a and the follower roller 3b is pressed against the carry roller 6b. Then, the document (O) is driven and conveyed to the separation unit of the document separation unit 11 and the reading unit of the document image reading unit 12 along the conveyance path.
Accordingly, even if the configuration is simple and the cost is low, the gripping shafts 4a and 4b are not moved along the rotation rollers 3a and 3b, and the original (O) and the transfer sheet (P) (not shown) are skewed. A document image reading device 10 that reads a document image of a document (O) that is transported with a pressure plate spring 0 that can be transported while preventing the occurrence of the ink, and a transfer of a placed transfer target (P) It has become possible to provide a transfer medium feeding device 20 (not shown) that separates and feeds sheets one by one.

FIG. 5 is a cross-sectional view taken along line AA of FIG. 2 according to another embodiment. In FIG. 5, the convex surface 5 is a bent end surface 5 c formed in the bending process of the pressure leaf spring body 1.
The left and right claw 2b, a right claw 2c (not shown), and a center claw 2a are provided on the pressure leaf spring body 1 disposed on the left and right, and a shaft 4 (not shown) is connected to the left claw 2b and the right claw 2c (not shown). Since the bent end surface 5c is provided at one corner on the surface side in contact with 4a and the shaft 4b, and the bent end surface 5c is provided at both corners on the surface side in contact with the shaft 4a and shaft 4b (not shown) on the central claw 2a. By changing the height of the bending end face 5c, it becomes possible to set a sliding resistance corresponding to the pressing pressure, and the rotation of the shaft 4a and the shaft 4b (not shown) to be gripped is controlled so that the original (O) Alternatively, the transfer sheet (P) can be conveyed while preventing the occurrence of skew.
The bent end surface 5c of the convex surface 5 is formed with an outer shape so that the bent end surface 5c is formed at a desired height on the surface side in contact with the shaft 4a and the shaft 4b (not shown) in the step of removing the pressure leaf spring body 1. In the bending process, it can be easily formed in a desired bending direction and height.
FIG. 6 is a cross-sectional view of another embodiment. In FIG. 6, the convex surface 5 is a bent fracture end surface 5 d formed in the punching bending process of the pressure leaf spring body 1.
The left and right claw springs 1 are provided with a left claw 2b, a right claw 2c (not shown), and a center claw 2a. The left claw 2b and the right claw 2c (not shown) are connected to the shaft 4a and the shaft 4b. A bending fracture end face 5d is provided at one corner on the surface side in contact, and the central claw 2a is provided with bending fracture end faces 5d at both corners on the surface side in contact with the shaft 4a and the shaft 4b. By forming, it becomes possible to set a sliding resistance corresponding to the pressing pressure at a low cost. By controlling the rotation of the gripping shaft 4a and the shaft 4b, the original (O) or the transfer target ( P) transfer paper can be conveyed while preventing skew.
Since the bending fracture end face 5d of the convex surface 5 does not form an outer shape in the punching process of the pressure leaf spring body 1 and performs bending while punching in the bending process to form a desired bending direction and height. In punching, the clearance increases, the fracture surface increases, and the bent fracture end face 5d is formed.

In FIG. 7, an image forming apparatus 50 that forms an image on a transfer sheet (P) of a transfer target (P) fed from the transfer target feeding apparatus 20 based on the original read image data read by the original image reading apparatus 10. The image forming unit 51 for forming an image and the pressure leaf spring 0 according to any one of claims 1 to 7, wherein the gripping shaft 4 is rotated with a simple structure even at low cost. 3, an image is formed while preventing the skew of the transfer paper of the document (O) or the transfer target (P).
Inside the image forming unit 51 where a high-quality toner image is formed at a high speed by an image forming process of the electrophotographic method, a photosensitive drum of an image carrier 51a is rotatably supported.
The image carrier 51a is rotationally driven clockwise in the direction of the arrow (A) shown in the drawing, and at this time, the surface of the image carrier 51a is charged to a predetermined potential by the charging device 51b.
Further, from the writing unit 51c, laser light (L) light-modulated in accordance with the original read image data of the image information read by the original image reading means 12 of the original image reading apparatus 10 having the pressure leaf spring 0 is provided. The surface of the drum-shaped photosensitive drum of the image carrier 51a, which is emitted and charged with the laser beam (L), is exposed to light, and thereby electrostatic latent images are formed on the surface of the drum-shaped photosensitive drum of the image carrier 51a. An image is formed.
The electrostatic latent image formed on the surface of the photosensitive drum is visualized by the developing device 51d to form a toner image, and the pressure plate spring 0 is interposed between the photosensitive drum and the transfer device 51e by the opposing transfer device 51e. The transfer medium transporting device 22 is separated from the paper feed cassette 23 on which the transfer sheet (P) of the transfer body (P) of the transfer body feeding device 20 having the above is placed by the transfer body separating means 21 one by one. As a result, the image is transferred and recorded on the transfer sheet of the transfer medium (P) fed through the conveyance path 24.

The surface of the photosensitive drum after the toner image is transferred to the transfer sheet (P) is cleaned by a cleaning device 51f to prepare for the next image formation.
The transfer medium feeding device 20 is disposed below the image forming unit 51, and the sheet feed cassette 23a of one of a plurality of sheet feed cassettes 23 that accommodates transfer sheets of the transfer target (P) or the sheet feed cassette. 23b is separated one by one by the transferred material separating means 21 and conveyed with the follower roller 3 that is gripped and pressed by the shaft 4 that is rotatably held by the pressure plate spring 0 of the transferred material conveying means 22. The roller 6 feeds the conveyance path 24 in the direction of the arrow (B) shown in the figure, and the toner image formed on the surface of the photosensitive drum as described above is transferred onto the surface of the transfer sheet of the transfer body (P). The
Next, the transfer sheet of the transfer object (P) passes through the fixing device 51g in the image forming unit 51 in the direction of the arrow (C) shown in the figure, and the transfer object (P) is caused by the action of heat and pressure at this time. The toner image transferred to the surface of the transfer paper is fixed on the surface.
The transfer sheet (P) that has passed through the fixing device 51g is discharged and stored in the discharge tray 51i by the discharge roller pair 51h.
Therefore, even if the configuration is simple and the cost is low, the gripping shaft 4 does not move with the follower roller 3, and the skew of the transfer sheet of the document (O) or the transfer target (P) is prevented. An image forming apparatus 50 that includes the pressure plate spring 0 and forms a high-quality image at high speed can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram for explaining a pressure plate spring and an original image reading apparatus including the pressure plate spring according to an embodiment of the present invention. The side view explaining the principal part of FIG. The bottom view explaining the other main part of FIG. The partial cross section enlarged view explaining the other principal part of the pressurization leaf | plate spring which shows the embodiment of this invention. The partially expanded sectional view explaining the principal part of the pressurization leaf | plate spring which shows the other embodiment of this invention. The partially expanded sectional view explaining the principal part of the pressurization leaf | plate spring which shows the other embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. An explanatory view for explaining a conventional pressure plate spring and a document image reading apparatus having the pressure plate spring. The side view explaining the principal part of FIG. The bottom view explaining the other main part of FIG.

Explanation of symbols

0 Pressure leaf spring 1 Pressure leaf spring body 2 Claw
2a center nail,
2b left nails,
2c Right nail 3 Rolling roller,
3a Rolling roller,
3b Roller roller 4 axis,
4a axis,
4b axis 5 convex surface,
5a Warp surface,
5b Curved surface with a predetermined radius,
5c bent end face,
5d Bending fracture end face 6 Conveying roller,
6a Conveying roller,
6b Conveying roller 10 Document image reading device 11 Document separating means 12 Document image reading means 20 Transfer object feeding device 21 Transfer object separating means 22 Transfer object conveying means 23 Paper feed cassette,
23a paper cassette,
23b Paper cassette 24 Transport path 50 Image forming measure 51 Image forming unit,
51a image carrier,
51b charging device,
51c writing unit,
51d developing device,
51e transfer device,
51f cleaning device,
51g fixing device,
51h Paper discharge roller pair,
51i Paper discharge tray 100 Pressure leaf spring 101 Pressure leaf spring body 102 Claw portion,
102a center nail,
102b left nails,
102c Right claw 103
103a
103b Accompanying roller 104 shaft,
104a axis,
104b Shaft 105 Conveying roller 106 Conveying roller 110 Document image reading device,
110a Document setting section 111 Document separation means 112 Document image reading means

Claims (11)

  In a plate-shaped pressure leaf spring that grips and presses the shaft that rotatably holds the follower roller, the pressure plate spring body, the claw portion formed at the end of the pressure leaf spring body, and the shaft of the follower roller A pressurizing leaf spring comprising a convex surface that protrudes from an edge on the gripping surface side to be gripped.   2. The pressure leaf spring according to claim 1, wherein the claw portions are formed at both ends of the pressure leaf spring main body.   3. The pressure leaf spring according to claim 1, wherein the claw portion includes a center claw and a left claw and a right claw formed on both left and right sides of the center claw.   4. The pressure leaf spring according to claim 1, wherein the convex surface is a warped surface formed in a step of removing the pressure leaf spring body.   5. The pressure leaf spring according to claim 4, wherein the warped surface is a curved surface having a predetermined radius formed on a gripping surface side that grips a shaft that rotatably holds the follower roller of the claw portion. Pressure leaf spring.   4. The pressure leaf spring according to claim 1, wherein the convex surface is a bent end surface formed in a bending step of the pressure leaf spring body.   4. The pressure leaf spring according to claim 1, wherein the convex surface comprises a bent fracture end surface having a fractured surface formed in a punching bending process of the pressure leaf spring main body.   In a document image reading apparatus that reads a document image of a document to be conveyed, a document separation unit that separates the document to be conveyed one by one, and a document that is separated by the document separation unit and conveyed to a reading unit An original image reading apparatus comprising: original image reading means for reading an original image; and a pressure plate spring according to any one of claims 1 to 7.   In the transferred object feeding apparatus for separating and feeding the transferred objects to be transferred one by one, the transferred object separating means for separating the transferred transferred objects one by one, and the transferred object separating means 8. A transferred object feeding apparatus comprising: a transferred object conveying means for conveying the transferred objects separated for each sheet; and a pressure plate spring according to any one of claims 1 to 7. .   An image forming unit that forms an image in an image forming apparatus that forms an image on a transferred material fed from a transferred material feeding device based on document read image data read by the document image reading device; and An image forming apparatus comprising the pressure leaf spring according to any one of 1 to 7. The image forming apparatus according to claim 10, wherein the image forming unit forms a toner image by an image forming process of an electrophotographic method.

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