JP2501343Y2 - Document feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a document feeder for a copying machine, and more particularly to a document feeder for automatically feeding a document sheet, or a reversing device for reversing a document sheet. The present invention relates to an automatic document feeder having a mechanism.

[Conventional technology]

Conventionally, as a document feeding device of this type, for example, a third document feeding device is used.
There are some as shown in FIGS. In FIG. 3, an original feeding device 1 is provided in contact with a contact glass 3 provided on an upper portion of a main body 2 of a copying machine, and an original paper 5 is fed on the contact glass 3. The document feeder 1 separates only one document sheet 5 stacked and placed on a table 6 at the center upper part and supplies it to the contact glass 3 on the left side in the figure and a sheet feeding and separating unit. A transport unit 8 that transports the document paper 5 supplied from the contact glass 7 to the document stop position P on the contact glass 3 and the document paper 5 that has been exposed on the contact glass 3 to the outside of the main body 2, or Inverted sheet discharge section 9 on the right side of the figure, which is inverted and supplied again onto contact glass 3
And have. The original paper 5 on the table 6 is called by the calling roller 11 of the paper feeding / separating unit 7, separated into only one original paper 5 by the separating roller 12, and then the registration sensor
The position and size of the manuscript paper 5 are detected by the document width sensor 13, the manuscript width sensor, the manuscript length sensor, and the like, and the manuscript paper 5 is sent to the conveying unit 8.
In the transport unit 8, the document paper 5 is transported by the annular transport belt 14 to the document stop position P on the contact glass 3 and, after being exposed, moves in the direction of the arrow T, and is moved out of the main body 2 by the reversal discharge unit 9. The paper is ejected. The conveyor belt 14 is a belt drive roller
It is driven by 17 and rotated between driven rollers 19 while being pressed against the contact glass 3 by a plurality of pressing rollers 18 provided facing the contact glass 3. Pressing roller
18 is rotated by the movement of the conveyor belt 14.

In order to accurately stop the original paper 5 at the original stop position P, the conventional original feeding device is configured as shown in FIGS.
A rectangular parallelepiped scale plate 15 is provided on the upstream end 3a of the contact glass 3 in a direction orthogonal to the moving direction of the original paper 5, and a scale plate is set on the end 3a of the contact glass 3 as a document stop position P. A step 16 formed by 15 end faces is provided.

The manuscript paper 5 is attached to the contact glass 3 by the conveyor belt 14.
When the original document 5 is conveyed upward, the trailing edge 5a of the original paper 5 once passes through the step 16, and then slightly goes backward to the step 16 side to move to the original stop position P.
It hits the step 16 which is and stops. A so-called butting mode method is used.

Even when the reversed original paper 5 is stopped at the original stop position P on the contact glass 3, the original paper 5 is reversed by the reverse discharge unit 9 and then moves backward on the contact glass 3 to hit the step 16. Stop. The so-called reversal butting mode is performed.

[Problems to be solved by the device]

However, in such a conventional document feeder, when the document paper 5 is abutted against the step 16, the document paper 5 is stepped.
16 on the upper edge, that is, the upper end surface 15a of the scale plate 15
Conveyor belt to prevent the vehicle from going over and going backwards
A fixed roller 20 fixed to the main body 2 is provided inside the step 14 near the step 16, so that the outer surface 14a of the conveyor belt 14 is constantly in contact with the upper end surface 15a of the scale plate 15 and is contacted on the downstream side of the upper end surface 15a. It is designed to pass closer to the glass 3 side. Therefore, the conveyor belt 14 and the scale plate
There is a problem that the contact resistance with 15 is large and the power consumption of the document feeder 1 is large. Further, due to the contact between the transport belt 14 and the scale plate 15, there is a problem that the scale plate 15 is quickly worn, the wear range is gradually increased, and the outer surface 14a of the transport belt 14 is quickly soiled.

[Purpose of device]

The present invention has been made against the background of the above-mentioned conventional problems. A roller moving means is provided in the vicinity of a step, and the roller is moved to move the conveyor belt only when the original paper is abutted against the step. By making contact with the upper edge of the step, the conveyor belt is normally separated from the step, that is, the upper end surface of the scale plate, and the contact time between the conveyor belt and the scale plate is greatly reduced, and the contact resistance is reduced. The power consumption can be reduced, the scale plate can be prevented from prematurely wearing and becoming dirty, the durability of the scale plate can be significantly improved, and the accuracy of stopping the original paper at the original stop position can be improved. An object of the present invention is to provide a document feeding device that can be stabilized.

[Means for solving the problem]

The document feeder according to the present invention achieves the above-mentioned object.
A conveyor belt that supplies the manuscript paper on the contact glass and moves the manuscript paper on the contact glass, and a step that forms a step at the end of the contact glass that extends in a direction orthogonal to the direction in which the manuscript paper moves by the conveyor belt. And a pressing roller that presses the conveyor belt so that the conveyor belt comes into contact with the upper edge portion of the step member at a predetermined contact pressure. In a document feeding apparatus capable of abutting against a step, a fulcrum shaft portion parallel to the step, and extending from the fulcrum shaft portion toward the step and rotatably supporting the pressing roller in the vicinity of the step A substantially L-shaped rotating member that has a first arm portion and a second arm portion that extends upward from the fulcrum shaft portion, and that is rotatable about the fulcrum shaft portion as a rotation fulcrum; A first spring member connected to the two arm portions and biasing the pressing roller in a direction opposite to the pressing direction via a rotating member; and a first spring member opposite to the rotating member. Is provided on the side of the first elastic member and is connected to the second arm portion of the rotating member at a position away from the rotating fulcrum shaft portion with respect to the first elastic member, and attaches the pressing roller in the pressing direction via the rotating member. A second spring member that can be biased, and the first and first springs that are connected to the second arm portion of the rotating member via the second spring member when the transport belt abuts the original paper on the step. A biasing force that moves the pressing roller downward via the rotating member while generating a biasing force on the second spring member, and normally returns the pressing roller upward by the biasing force from the first spring member. A generating member is provided.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

1 and 2 are views showing the essential parts of an embodiment of a document feeding apparatus according to the present invention, and the same components as those of the conventional document feeding apparatus shown in FIG.

First, the configuration will be described. In FIG. 1, reference numeral 22 is a conveyance section of the document feeder 21 of the present invention, and the conveyance section 22 is
A conveyor belt 14 is provided in the vicinity of the contact glass 3, and the conveyor belt 14 is driven by a belt driving roller 17 and rotates between a driven roller 19 (not shown). A rectangular scale plate 15 made of a resin member is disposed on the upstream side (left side in the figure) of the contact glass 3 in a direction orthogonal to the moving direction of the original paper 5, and the end face of the scale plate 15 is stepped.
Forming 16. A cylindrical roller 25 (pressing roller) is arranged inside the conveyor belt 14 near the step 16. The shaft 25a of the roller 25 is guided by a guide 26 that is formed in an elliptical shape in the vertical direction and can move up and down.

When the shaft 25a of the roller 25 is in contact with the lower end 26a of the guide 26, the roller 25 presses the conveyor belt 14 toward the contact glass 3 side, and at the position of the step 16, that is, the original stop position P, the outer surface of the conveyor belt 14. 14a is the upper surface 1 of the scale plate 15
From 5b, the conveyor belt 14 deforms and moves so as to be on the contact glass 3 side by the distance y shown in FIG. 1, and there is no gap between the scale plate 15 and the outer surface 14a of the conveyor belt 14,
In addition, the conveyor belt 14 contacts the upper end surface 15b of the scale plate 15 with a constant contact pressure. Also, as shown in FIG. 2, the shaft 25a of the roller 25 has an upper end 26b of the guide 26.
When the roller 25 is in contact with the conveyor belt 14, the roller 25 is located inside the conveyor belt 14 at a standby position apart from the conveyor belt 14.
The tension 14 is retracted upward from the scale plate 15 by tension so that it does not contact the scale plate 15.

Reference numeral 30 denotes a roller moving means, and the roller moving means 30 has an L-shaped lever 31 (rotating member) located near the step 16. The lever 31 includes a pin 32 (fulcrum shaft portion) parallel to the step 16, one end portion 31a (first arm portion) extending from the pin 32 toward the step 16, and the other extending upward from the pin 32. The pin 32 is provided with the end portion 31b (second arm portion).
The lever 25 can be rotated about a fulcrum, and the roller 25 is attached to one end of the lever 31.
It has a U-shaped recess 31a that engages with the shaft 25a. Recess
The roller 31a is supported by the guide 26 so that the roller 25 can be moved up and down by the rotation of the lever 31. Lever 31
The other end 31b is connected to a solenoid 35 via a spring 34. The solenoid 35 is a detection signal of the registration sensor 13.
When the suction operation is performed by S _{1 and the} paper discharge operation after exposure is started, the release operation is performed by the paper discharge start signal S ₂ . When the solenoid 35 is released, the lever 31
Is rotated by a return spring 36, and the roller 25 returns to the standby position. Roller moving means 30
Is, as described above, the lever 31, the pin 32, the spring 34,
It is composed of a solenoid 35 and a return spring 36. And the return spring 36 is
The first spring member is connected to the other end 31b of the roller 31 and biases the roller 25 through the lever 31 in the direction opposite to the pressing direction of the roller 25. A second spring which is provided on the opposite side of the return spring 36 and which is connected to the other end 31b of the lever 31 at a position away from the pin 32 from the return spring 36 and can bias the roller 25 in the pressing direction via the lever 31. It is a member. Further, in the solenoid 35, the conveyor belt 14 steps the original paper 5 in steps.
When abutting against the 16, the roller 25 is moved downward via the lever 31 while generating a tensile force (urging force) on both springs 34, 36, and normally the roller 25 is moved upward by the urging force from the return spring 36. It is an urging force generating member for returning. Other than the above, it is the same as that shown in FIG.

 Next, the operation will be described.

In the document feeding device of the present invention, the roller moving means 30 is provided in the vicinity of the step 16, so that the document paper 5 is fed to the paper feeding and separating section 7.
When the manuscript paper 5 is almost moved onto the collector glass 3 and the rear end 5a of the manuscript paper 5 is detected by the registration sensor 13, the registration sensor 13
The solenoid 35 performs a suction operation in response to the detection signal S ₁ from the lever 13, and the lever 31 rotates about the pin 32 as a fulcrum via the spring 34. The recess 31a of the lever 31 is engaged with the shaft 25a of the roller 25, the roller 25 is guided by the guide 26, and the guide 26
It is pushed down until it touches the lower end 26a of the. That is, the roller 25 moves from the standby position on the upper side of the conveyor belt 14 to the contact glass 3 side and presses the conveyor belt 14 downward. At this time, the conveyor belt 14 has the outer surface 14a and the scale plate 1
The end surface upper part 15a of 5 is deformed so that it overlaps by a distance y, the gap between the conveyor belt 14 and the scale plate 15 is eliminated, and the conveyor belt 14 is the end surface upper part 15a of the scale plate 15,
That is, the upper edge portion of the step 16 comes into contact with a constant contact pressure. The manuscript paper sheet 5 is conveyed onto the contact glass 3, and when the trailing edge 5a of the manuscript paper sheet 5 goes too far (about 5 mm) from the manuscript stop position P of the manuscript paper sheet 5, that is, the step 16 on the end face of the scale plate 15, the belt drive roller is driven. 17 is reversed and manuscript paper 5
Hits the step 16 of the scale plate 15, and so-called resit and skew are corrected. Further, since there is no gap between the conveyor belt 14 and the scale plate 15 and the conveyor belt 14 is in contact with the scale plate 15 at a constant contact pressure, when the original paper 5 is abutted against the step 16, It is possible to prevent 5 from riding on the step 16.

When the original paper 5 is exposed on the contact glass 3 by the main body of the copying machine and the original feeding device 21 starts a paper discharge operation, a solenoid 35 is generated by a paper discharge start signal S ₂ of this paper discharge operation.
The suction operation is stopped and the release operation is started, and the lever 31 returns to the standby position shown in FIG. 2 by the tension of the return spring 36. The roller 25 moves upward to a position where it does not contact the conveyor belt 14, and the conveyor belt 14 is separated from the scale plate 15. The pressing roller 18 follows the movement of the conveyor belt 14,
Since the conveying belt 14 is pressed by the weight of the pressing roller 18, the original paper 5 on the contact glass 3 moves together with the conveying belt 14 and is discharged.

The conveyor belt 14 contacts the scale plate 15 by the detection signal S ₁ of the registration sensor 13, that is, the upper edge of the step, and separates from the scale plate 15 by the paper discharge signal S ₂ of the document feeder 21. That is, the conveyor belt 14 is moved to the contact glass 3 side by the roller 25 from the standby position on the upper side of the conveyor belt 14 and abuts the scale plate 15 only when the original paper 5 hits the step 16, and the conveyor belt 14 and the scale are Since the contact time for contacting the plate 15 is significantly shortened as compared with the conventional one, the contact resistance between the conveyor belt 14 and the scale plate 15 is significantly reduced, and the power consumption is significantly reduced. Further, the wear of the surface of the scale plate 15 can be significantly reduced, and the wear resistance of the scale plate 15 can be improved. Further, it is possible to prevent the occurrence of stains at an early stage, and it is possible to clean. Furthermore, since the contact time between the transport belt 14 and the scale plate 15 is shortened, the generation of noise due to this contact can be significantly reduced. Furthermore, since the wear of the contact portion of the scale plate 15 with the conveyor belt 14 is reduced, the document paper 5 does not run up due to the wear of the contact portion of the scale plate 15, and the document paper 5 reaches the document stop position P. The accuracy can be greatly improved and stabilized.

The operation when the original paper 5 is reversed will be described. When the reversed original paper 5A obtained by reversing the original paper 5 is abutted against the step 16 and positioned, the original paper 5 is reversed by the reverse paper discharge unit 9 shown in FIG. When the rear end of the reverse document sheet 5A (not shown) which is reversed and goes backward on the contact glass 3 is detected, the solenoid 35 is actuated, and thereafter the same operation as described above is performed. In the abutting mode, the same operation and effect as in the abutting mode of the original paper 5 described above can be obtained.

In the above device, the following operational effects can be further obtained. That is, when the transport belt 14 abuts the original paper 5 against the step 16, the solenoid 35 drives the lever 31 while generating a tensile force on the spring 34 and the return spring 36, and rotates the lever 31 against the spring 36. Then, the roller 25 is moved in the pressing direction. At this time, the roller 25 presses the conveyor belt 14 against the upper edge of the step while being movable up and down, so that the conveyor belt 14 can be reliably pressed and contacted with the upper edge of the step. At the same time, the state can be stabilized. Further, the return spring 36 and the spring 34 become a spring member connected in series with the other end 31b of the lever 31 interposed therebetween, and the return spring 36 is located closer to the pin 32 than the spring 34 is on the lever 32 side.
Since it is connected to the other end 31b of 31, the load of the return spring 36 for return on the solenoid 35 can be sufficiently reduced when the solenoid 35 operates. Further, since the lever 31 is substantially L-shaped, the stroke of the vertical movement of the roller 25 can be freely set.

〔effect〕

As described above, according to the present invention, the roller moving means is provided in the vicinity of the step, and the roller is moved to bring the conveyor belt into contact with the upper edge of the step only when the original paper is brought into contact with the step. As a result, the conveyor belt is usually separated from the step, that is, the upper end surface of the scale plate, to significantly reduce the contact time between the conveyor belt and the scale plate, reduce the contact resistance, and reduce the power consumption. It is possible to prevent early wear and early stain of the plate, further greatly improve the durability of the scale plate, and further improve the accuracy of stopping at the document stop position and stabilize it.

[Brief description of drawings]

1 and 2 are views showing an embodiment of a document feeding apparatus according to the present invention, FIG. 1 is a schematic explanatory view showing a roller moving means thereof, and FIG. 2 is an explanatory view showing its action. . Third to fifth
FIG. 1 is a diagram showing a conventional document feeding device, FIG. 3 is an overall schematic explanatory diagram thereof, FIG. 4 is an explanatory diagram of its essential parts, and FIG. 5 is an enlarged explanatory diagram of its essential parts. 3 ... Contact glass, 5 ... Original paper, 15 ... Scale plate, 16 ... Step, 21 ... Original feeding device, 22 ... Conveying section, 25 ... Roller, 30 ... Roller moving means, 31 ...... Lever (rotating member), 31a …… One end (first arm), 31b ……
The other end (second arm), 32 ...... pin (fulcrum shaft).

Claims (1)

(57) [Scope of utility model registration request] 1. A conveyor belt for supplying a manuscript paper onto a contact glass and moving the manuscript paper on the contact glass, and an end portion of the contact glass extending in a direction orthogonal to the direction of movement of the manuscript paper by the conveyor belt. A step member that forms a step, and a pressing roller that presses the conveyor belt so that the conveyor belt comes into contact with the upper edge of the step member at a predetermined contact pressure, and the conveyor belt is provided on the contact glass. In a document feeding device capable of abutting a manuscript sheet against the step, a fulcrum shaft portion parallel to the step, a fulcrum shaft portion extending from the fulcrum shaft portion toward the step, and the pressing roller in the vicinity of the step. A substantially L-shaped rotation that includes a first arm portion that is rotatably supported and a second arm portion that extends upward from the fulcrum shaft portion and that is rotatable around the fulcrum shaft portion as a rotation fulcrum. Element A first spring member connected to the second arm portion of the rotating member for urging the pressing roller in a direction opposite to the pressing direction via the rotating member; It is provided on the side opposite to the first spring member and is connected to the second arm portion of the rotating member at a position apart from the rotating fulcrum shaft portion with respect to the first elastic member, and via the rotating member. And a second spring member capable of urging the pressing roller in the pressing direction, and the second belt member connected to the second arm portion of the rotating member via the second spring member. When abutting against the step, the pressing roller is moved downward via the rotating member while generating an urging force on the first and second spring members, and normally the pressing force from the first spring member is applied. A biasing force generating member that returns the pressing roller upward by a biasing force, Document feeder, characterized in that digit.