JP3496343B2 - Sheet transport device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying device for assisting the feeding of a sheet-shaped conveyed object in a predetermined direction.

[0002]

2. Description of the Related Art When a sheet is conveyed in a printer, a copying machine, a facsimile or the like, or when another sheet-shaped object to be conveyed is sent in a predetermined direction, the object to be conveyed is assisted in feeding the object. A sheet conveying device including a roller for pressing is used.

The sheet conveying device includes a roller which presses the surface of the conveyed object and which rotates with the feeding of the conveyed object, a shaft fitted through the center of rotation of the roller and a roller. And a pair of support plates each having a shaft hole into which the end of the shaft is inserted.

To manufacture a support plate for a sheet conveying device,
First, a metal plate is punched out to form a shape in which two supporting plates extend in a plane on both sides of a fixed portion, and then,
A punching hole that is slightly larger than the diameter of the shaft is formed in a portion of the two support plates that serves as the shaft hole, and then the two support plates are bent at substantially right angles to the fixed portion so as to face each other.

The supporting plate of the sheet conveying device has an advantage that it can be manufactured at low cost because it can be easily manufactured by such a simple punching process. The rollers arranged between the supporting plates of the sheet conveying device are supported by inserting the end portions of the shafts of the rollers into shaft holes provided in the supporting plates. At this time, the punched end of the shaft hole has burrs and a relatively sharp portion at the time of punching, so that the shaft is scratched, and the shaft is abraded and abnormally worn. Cause.

Therefore, there is also used a sheet conveying device for forming a burring portion by performing a burring process after punching the shaft hole to form a burring portion and supporting the roller with the burring portion as a bearing.

[0007]

However, such a sheet conveying device has the following problems. That is, even when the burring process is performed on the shaft hole to form the burring part, the punched end of the shaft hole, which is the tip of the burring part, may come into contact with the shaft due to its shape and variations.

That is, as shown in the partially enlarged cross-sectional view of FIG. 5, the burring portion 32 causes the shaft 3 to move due to variations in molding.
If the shape is such that it approaches the shaft 3 as it advances in the direction of the tip of the shaft 3, the shaft 3 and the tip 32d of the burring portion 32
The punched end 31a of the shaft hole is in contact with. If the shaft 3 is rotated by the rotation of the roller 2 in this state, the shaft 3 may be scratched or may cause uneven wear or abnormal noise.

Further, even when the burring portion 32 is accurately formed and extends substantially parallel to the shaft 3, the punched end 31a of the shaft hole, which is the tip 32d of the burring portion 32, is formed.
Burrs and sharp parts are generated during punching, and if these protrude toward the shaft 3 side, the shaft 3
This causes problems such as scratches on the skin, uneven wear, and abnormal noise.

Furthermore, even if the punching end 31a of the shaft hole, which is the tip 32a of the burring portion 32, does not have burrs, and the burring portion 32 extends substantially parallel to the shaft 3, When the distance between the pair of support plates 4'is inclined so as to become narrower in the direction of the pressing force applied to the roller 2 (see the arrow in the drawing), the tip 32d of the upper burring portion 32 in FIG. The shaft 3 and the shaft 3 come into contact with each other, resulting in damage to the shaft 3, uneven wear, and abnormal noise.

Therefore, it is an object of the present invention to provide a sheet conveying device capable of preventing abrasion of a shaft and generation of abnormal noise.

[0012]

SUMMARY OF THE INVENTION The present invention is a sheet conveying device configured to achieve the above object. That is, the present invention is a sheet conveying device for assisting the feeding of a conveyed object when the sheet-shaped conveyed object is fed in a predetermined direction. A roller that rotates along with the shaft, a shaft that fits in a state of penetrating the center of rotation of the roller, and a shaft that is formed by punching to insert the end of the shaft. And a pair of support plates each of which has a pair of support plates. When the pair of support plates apply a pressing force to the roller via the shaft to press the transported object, the shaft contacts the portion other than the punched end of the shaft hole. It is composed.

[0013]

In the present invention, the shaft and a portion other than the punched-out end of the shaft hole come into contact with each other in a state where the pair of support plates supporting the roller apply a pressing force to the roller via the shaft to press the conveyed object. . That is, this pressing force is transmitted to the shaft via the portion of the support plate other than the punched end of the shaft hole, and is transmitted from this shaft to the roller. For this reason, even if the roller and the shaft rotate as the conveyed object is fed, the punched end of the shaft hole does not come into contact with the shaft.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the sheet conveying apparatus of the present invention will be described below with reference to the drawings. 1A and 1B are views for explaining a first embodiment of a sheet conveying apparatus of the present invention, FIG. 1A is a perspective view and FIG. 1B is a sectional view. This sheet conveying device 1 is
When a sheet-shaped conveyed object 10 such as a sheet is sent in a predetermined direction (see an arrow in the drawing), the conveyed object 10 is pressed, for example, from above to assist the feeding.

The sheet conveying device 1 includes a roller 2 that presses the surface of the conveyed object 10 and rotates with the conveyance of the conveyed object 10, and a shaft 3 that is fitted in a state of penetrating the rotation center of the roller 2. , A pair of support plates 4 arranged to hold the roller 2 with the roller 2 in between.

The support plate 4 extends downward from a fixed plate 41 arranged above the roller 2 and further has a shaft hole 31 into which the end of the shaft 3 of the roller 2 is inserted. . Further, the shaft holes 31 provided in the support plate 4 are each formed by punching, and a burring portion 32 is provided by a burring process.

In particular, in the sheet conveying apparatus 1 in the first embodiment, the distance between the pair of support plates 4 slightly increases in the direction of the pressing force (see the arrow in the figure) applied from the support plates 4 to the roller 2. It is characterized in that it has been expanded to.
That is, the pair of support plates 4 extending downward from the fixed plate 41.
However, it is inclined by θ with respect to the vertical direction. It should be noted that this θ is set to, for example, several degrees such that the shaft 3 does not come out of the shaft hole 31, and the shaft hole 31 has a clearance with the shaft 3 even when the support plate 4 is tilted. Make it a diameter that you can hold.

As a result, from the support plate 4 to the shaft 3 of the roller 2.
When the pressing force is applied to the shaft 3, the shaft 3
It does not come into contact with the lower burring portion 32 in (b),
The state is in contact with the curved portion of the upper burring portion 32. That is, the structure can prevent contact between the shaft 3 and the punched end of the shaft hole 31.

FIG. 2 is a partially enlarged sectional view (1) of the burring portion for explaining each embodiment. As shown in FIG. 2A, in the first embodiment, the support plate 4 is slightly inclined with respect to the direction of the pressing force (see FIG. 1).
(A) Both the middle upper burring portion 32a and the lower burring portion 32b have a predetermined angle with respect to the shaft 3.

In other words, the upper burring portion 32a has the shaft 3
Tilt away from the axis 3 as you move toward the tip of the
The lower burring portion 32b is inclined so as to approach the shaft 3 as it advances toward the tip end of the shaft 3. When a pressing force (see FIG. 1) is applied from the support plate 4 to the roller 2, the shaft 3
Will be pressed against the upper burring portion 32a by its reaction, but since the upper burring portion 32a has the inclination as described above, the shaft 3 is not connected to the curved portion R of the upper burring portion 32a. It comes into contact.

That is, when the pressing force is applied, the shaft 3 has the shaft hole 31 which is the tip of the burring portions 32a and 32b.
It does not come into contact with the punched-out end 31a, but comes into contact with the curved portion R of the upper burring portion 32a. This prevents the shaft 3 from being scratched even if the punched end 31a has burrs or sharp portions.
Uneven wear and abnormal noise can be prevented. In particular, in the first embodiment, the above merit can be obtained with a simple structure in which the bending angles of the pair of support plates 4 are set.

Next, the second embodiment will be described with reference to FIG. That is, in the second embodiment, the support plate 4
The burring portion 32 provided in the shaft hole 31 is slightly widened as it goes in the direction of the tip of the shaft 3. When a pressing force (see FIG. 1) is applied from the support plate 4 to the roller 2, the shaft 3 is pressed against the burring portion 32 on the upper side in the figure by the reaction thereof. Since the burring portion 32 in the second embodiment has the spread as described above, the shaft 3 comes into contact with the curved portion R of the burring portion 32 on the upper side in the drawing.

That is, when the pressing force is applied, the shaft 3
Does not come into contact with the punched-out end 31a of the shaft hole 31, which is the tip of the burring portion 32, but comes into contact with the curved portion R.
As a result, similarly to the first embodiment, even if the punched end 31a has a burr or a sharp portion, the shaft 3
It is possible to prevent uneven wear and generation of abnormal noise without being scratched. When the structure of the burring portion 32 in the second embodiment is adopted, the angle of the support plate 4 described in the first embodiment may be set at the same time. This makes it possible to more reliably avoid contact between the shaft 3 and the punched end 31a.

Next, the third embodiment will be described with reference to FIG. That is, in the third embodiment, the support plate 4
It is characterized in that the tip end of the burring portion 32 provided in the shaft hole 31 is rounded. When a pressing force (refer to FIG. 1) is applied to the roller 2 from the support plate 4 in the third embodiment, the shaft 3 reacts to the burring portion 3 on the upper side in the drawing.
The second curved portion R comes into contact with the curved portion R.

As a result, similarly to the first and second embodiments, the shaft 3 and the burring portion 3 are also used in the third embodiment.
The punched end 31a of the shaft hole 31, which is the tip of the shaft 2, does not come into contact with the shaft 3, so that the shaft 3 can be prevented from being scratched, unevenly worn, and generating abnormal noise.

Next, a fourth embodiment will be described with reference to FIG. That is, in the fourth embodiment, the support plate 4
It is characterized in that a narrowed portion 32c directed toward the inside of the shaft hole 31 is provided in the middle of the burring portion 32 provided in the shaft hole 31. When a pressing force (see FIG. 1) is applied to the roller 2 from the support plate 4 in the fourth embodiment, the shaft 3 comes into contact with the narrowed portion 32c of the burring portion 32 on the upper side in the drawing due to its reaction.

As a result, similarly to the first to third embodiments, in the fourth embodiment as well, the shaft 3 and the punched end 31a of the shaft hole 31, which is the tip of the burring portion 32, do not come into contact with each other, and the shaft 3 It is possible to prevent scratches, uneven wear, and noise. Furthermore, in the fourth embodiment,
Since the throttle portion 32c has a structure protruding toward the inner side of the shaft hole 31, the positioning of the shaft 3 in the direction of the pressing force when the pressing force (see FIG. 1) is applied can be accurately performed. There is also an advantage that the transported object 10 (see FIG. 1A) can be accurately pressed.

Next, the fifth embodiment will be described with reference to FIG. That is, in the fifth embodiment, the shaft hole 31
The position of the tip 32d of the burring portion 32 provided in
It is characterized in that it is provided outside the position of the tip 3a of the shaft 3. The support plate 4 to the roller 2 in the fifth embodiment.
When a pressing force (see FIG. 1) is applied to the shaft 3, the shaft 3 is brought into contact with the upper burring portion 32 in the figure by its reaction, but the tip 32d of the burring portion 32 is outside the tip 3a of the shaft 3. Therefore, the punched end 31a of the shaft hole 31, which is the tip 32d of the burring portion 32, does not come into contact with the peripheral surface 3b of the shaft 3.

As a result, even in the fifth embodiment, the first
As in the first to fourth embodiments, contact between the punched end 31a and the shaft 3 can be eliminated to prevent damage to the shaft 3, uneven wear, and abnormal noise. The fifth embodiment is particularly suitable for the shaft hole 31.
Is relatively large and is effective when the burring portion 32 can be lengthened.

Next, a sixth embodiment will be described with reference to FIG. That is, in the sixth embodiment, as in the fourth embodiment (see FIG. 3A), the narrowing portion 32c is provided in the middle of the burring portion 32, and the fifth embodiment (see FIG. 3B). ), The tip 3 of the burring portion 32
The feature is that 2d is outside the tip 3a of the shaft 3.

A pressing force is applied from the support plate 4 to the roller 2 (see FIG. 1).
(Refer to FIG. 3), the shaft 3 comes into contact with the narrowed portion 32c of the burring portion 32 on the upper side in the figure by its reaction. Moreover, since the punching end 31a of the shaft hole 31, which is the tip 32d of the burring portion 32, is outside the tip 3a of the shaft 3, the punching end 31a does not contact the peripheral surface 3b of the shaft 3. Thereby, the first to fifth embodiments
As in the embodiment, the contact between the punched end 31a and the shaft 3 can be eliminated to prevent the shaft 3 from being scratched, unevenly worn, and generating abnormal noise.

Next, a seventh embodiment will be described with reference to FIG. In the seventh embodiment, from the viewpoint of bringing the shaft 3 into contact with the portion of the shaft hole 31 other than the punched-out end 31a in the state in which a pressing force (see FIG. 1) is applied to the roller 2 from the support plate 4, the tip of the shaft 3 is in contact. It is characterized in that a taper portion 3c is provided in the portion.

A pressing force is applied from the support plate 4 to the roller 2 (see FIG.
(Refer to FIG. 3) is applied, the shaft 3 is brought into contact with the upper burring portion 32 in the figure by its reaction. In the seventh embodiment, in this state, the straight portion 3d of the shaft 3 comes into contact with the upper burring portion 32 in the figure, and the punched end 31a of the shaft hole 31 which is the tip of the burring portion 32 does not come into contact with the shaft 3. It becomes a state. That is, since the taper portion 3c that is tapered is provided at the tip of the shaft 3, when the straight portion 3d of the shaft 3 and the burring portion 32 on the upper side in the drawing are in contact with each other, the taper portion 3c and the punched portion are punched out. A gap corresponding to the taper angle is formed between the end 31a and the end 31a, so that contact can be avoided.

As a result, similarly to the first to sixth embodiments, in the seventh embodiment as well, contact between the punching end 31a and the shaft 3 is eliminated, and the shaft 3 is scratched, unevenly worn, and produces abnormal noise. Can be prevented. In addition, in the seventh embodiment, the shaft 3 and the burring portion 32 and the support plate 4 are not subjected to any treatment, and the above-mentioned shaft 3 has a simple structure in which the tapered portion 3c is provided at the tip portion of the shaft 3. It is possible to obtain benefits.

[0035]

As described above, the sheet conveying device of the present invention has the following effects. That is, in the sheet conveying device of the present invention, since the shaft and a portion other than the punched end of the shaft hole come into contact with each other in a state in which the pair of support plates applies a pressing force to the roller via the shaft to press the conveyed object. It is possible to avoid contact between the punched end of the shaft hole and the shaft. This makes it possible to reliably prevent damage to the shaft, uneven wear of the shaft, and abnormal noise even if the punched end of the shaft hole has a burr or a sharp portion.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a first embodiment of the present invention, (a)
Is a perspective view, and (b) is a sectional view.

FIG. 2 is a partially enlarged cross-sectional view (part 1) for explaining each embodiment, in which (a) is the first embodiment, (b) is the second embodiment,
(C) is a third embodiment.

FIG. 3 is a partially enlarged sectional view (part 2) for explaining each embodiment, in which (a) is a fourth embodiment, (b) is a fifth embodiment,
(C) is a sixth embodiment.

FIG. 4 is a partially enlarged sectional view illustrating a seventh embodiment of the present invention.

FIG. 5 is a partially enlarged sectional view illustrating a conventional example.

[Explanation of symbols]

1 sheet conveying device 2 rollers 3 axes 4 Support plate 10 Transported object 31 shaft hole 31a punched end 32 Burling part

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Claims (6)

(57) [Claims] 1. A sheet conveying device for assisting the feeding of a conveyed object when the sheet-shaped conveyed object is fed in a predetermined direction, the pressing means for pressing the surface of the conveyed object and the conveyed object. A roller that rotates with the feeding of the roller, a shaft that fits in a state of penetrating the center of rotation of the roller, and a roller that is disposed with the roller in between, and is formed by punching to insert the end of the shaft. A pair of support plates each having an axial hole formed therein, and in a state in which a pressing force is applied to the roller from the pair of support plates via the shaft to press the transported object, the shaft is A sheet conveying device, which is in contact with a portion other than a punched end of a hole. 2. A burring portion formed by burring processing is provided in the shaft hole, and in a state in which a pressing force is applied to the roller from the pair of support plates via the shaft to press the transported object, The sheet conveying apparatus according to claim 1, wherein the shaft contacts a curved portion of the burring portion of the shaft hole. 3. The shaft hole is provided with a burring portion by a burring process, and the distance between the pair of support plates slightly increases in the direction of the pressing force applied from the support plates to the roller. The sheet conveying apparatus according to claim 1, wherein the sheet conveying apparatus is widened. 4. The burring portion formed by burring processing is provided in the shaft hole, and the burring portion is widened as it advances in the tip direction of the shaft. Sheet transport device. 5. A burring portion formed by burring processing is provided in the shaft hole, and a throttle portion directed toward the inside of the shaft hole is provided in the middle of the burring portion. The sheet conveying device according to claim 1. 6. The shaft hole is provided with a burring portion by a burring process, and the tip position of the burring portion is arranged outside the tip position of the shaft. 1. The sheet conveying device according to 1.