JPH09188438A - Sheet material conveyance device and image forming device - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To improve the workability of removing a sheet material by making it possible to easily grasp a sheet material stopped due to a paper jam in a transport path. Also, the usable sheet material is returned to the sheet material placing means. In a sheet material conveying device 1 in which a guide member 10 (second sheet material guiding member) is openable and closable so that a sheet material Sa stopped in a conveyance path H can be taken out, an opening / closing operation of the guide member 10 is performed. By the paper feed roller 6
A fan gear 22 (driving force transmitting means) for driving (conveying means) is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet material conveying apparatus used in an image forming apparatus such as a copying machine, a laser beam printer, an electrostatic printer or a facsimile, and particularly to a sheet material when the sheet material is stopped in a conveying path. Can be easily removed.

[0002]

2. Description of the Related Art A conventional sheet material conveying device of this type is shown in FIG.

That is, the sheet material conveying apparatus 100 is one of the elements constituting the image forming apparatus, and conveys the sheet material from the cassette 111 for accommodating the sheet material bundle 102 to the image forming section. To do.

In the sheet material conveying apparatus 100, the sheet material bundle 102 is stacked on the intermediate plate 105 in the cassette 111. The intermediate plate 105 is pressed by the pressure spring 104 as shown in FIG.
, The sheet material bundle 102 is biased toward the paper feed roller 103.

The sheet material 101 located at the uppermost portion of the sheet material bundle 102 is moved by the rotation of the sheet feeding roller 103 to form an arrow A1.
It advances in the 01 direction, and is separated and fed one by one to the conveyance path H ′ by the separation claw 112 provided in front of the cassette 111.

The transport path H'has a substantially concave inverted curved surface 10.
Inversion guide member 108 having 8a and inversion curved surface 108
The reversing guide member 110 facing a is provided, and the feeding direction of the sheet material 101 is reversed to convey the sheet material 101 to an image forming unit (not shown). Further, the reversing guide member 108 is pivotally supported by the apparatus main body by the shaft 108b, and when the sheet material is stopped in the transport path H ', the operator can open it in the direction of the arrow A102 to release the transport path H'. I am trying.

The separately fed sheet material 101 is conveyed downstream by a conveying roller 106 which is constantly rotating while a main motor (not shown) is rotating and a driven roller 107 which is rotated by the conveying roller 106. .

Then, the conveyance guide 11 for the sheet material 101
When the sheet reaches the registration roller pair 109 that is provided so as to be able to enter and retract in the transport path constituted by 0, the sheet material 1
The main motor is stopped in order to synchronize the leading edge when the image is formed at 01.

Further, after the sheet material 101 is stopped for a predetermined time, a pair of upper and lower guide plates 11 are guided to the image forming portion.
3, 114, and the toner image on the photoconductor is transferred onto a transfer unit of an image forming unit (not shown).
Then, the sheet material to which the toner image is transferred is heated and fixed by a fixing unit (not shown) and discharged to the outside of the apparatus.

[0010]

In the case of the sheet material conveying apparatus as shown in FIG. 20 described above, when the sheet material 101 stops due to a paper jam (jam) near the reverse curved surface, the sheet material causing the paper jam is removed. The sheet material 1 inside the sheet material conveying device is retracted (released) to remove the sheet material 1
01 needs to be removed. FIG. 21 is a diagram showing a state in which the reversing member 108 is opened in the direction of arrow A102.

However, in the state of FIG. 21, the fingers of the operator who removes the paper jam interferes with the reversing member 108 and the like, and the sheet material is conveyed by the conveying means and the like (in the conventional example, in the conventional example) in the upstream and downstream of the conveying path H '. When stopped while being sandwiched between the paper roller 103 and the registration roller pair 109), the inner guide member 110 was stuck and the workability of the removal work was poor.

Further, the leading edge portion 101a of the sheet material having the paper jam or the sheet material conveyed next is
When the sheet material 101 is stopped near the entrance of the transport path H ′, the sheet material 101 is in a state of being pressed by the sheet feeding roller 103, and the tip portion 101a is very difficult to be gripped by the operator's fingers, so that the removal work is difficult. In many cases, even if the sheet material is forcibly pulled out, the front end portion 101a of the sheet material is often torn or torn.

In such a case, in the case of the front loading system in which the cassette 111 is pulled out at a right angle to the carrying direction, by pulling out the cassette 111,
Although the sheet material 101 is pulled out from the apparatus main body in a direction perpendicular to the conveying direction, the leading end portion 101a of the sheet material in the state as shown in FIG. It will hit the body and be broken.

On the other hand, in the case where the cassette 111 is of the side loading type in which it is pulled out to the left in the figure, the cassette 11
When 1 is pulled out, the sheet material 101 is left in the transport path H ′ while being sandwiched between the registration roller pair 109, the transport roller 106 and the driven roller 107, so that the sheet material is not only wasted but also new. There was also a problem that it could cause the occurrence of jamming of various sheet materials.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to make it possible to easily grasp a sheet material stopped due to a paper jam in a conveying path, and It is to improve the removal workability and prevent waste of usable sheet material due to inadequate removal work.

[0016]

In order to achieve the above object, in the present invention, a sheet material is sandwiched and transported, and a sheet material is provided in a transportation path through which the sheet material is transported. A first sheet material guide member for guiding one surface of the sheet material; and a second sheet material guide member facing the first sheet material guide member for guiding the other surface of the sheet material. In a sheet material conveying device in which the sheet material guide member is openably and closably provided so that the sheet material stopped in the conveying path can be taken out, a drive for driving the conveying means by the opening / closing operation of the second sheet material guide member. Equipped with force transmission means.

Therefore, by driving the conveying means by the opening / closing operation of the second sheet material guide member for releasing the conveying path, the sheet material stopped in the conveying path is moved to the stopped position. .

However, the conveying means is a sheet feeding roller that comes into contact with the sheet material placed on the sheet material placing means and feeds the sheet to the conveying path, and the driving force transmitting means is the second sheet material. When the guide member is opened, the paper feed roller is rotated in the forward direction to advance the sheet material in the conveying direction, and when the second sheet material guide member is closed, the paper feed roller is rotated in the reverse direction to load the sheet material onto the sheet material. It is also suitable to return to the placing means.

In this case, by opening the second sheet material guide member, the sheet material moves in the conveying direction in the conveying path, and by closing it, the sheet material returns to the sheet material placing means.

Further, the driving force transmission means includes a plurality of transmission paths having different drive amounts of the conveying means and switching means for switching the transmission paths, and the second switching means is operated to operate the second transmission path. It is also preferable that the drive amount when the sheet material guide member is closed is made larger than the drive amount when the sheet material guide member is opened.

In this case, the sheet material returns to the sheet material placing means when the second sheet material guide member is closed by more than the moving amount of the sheet material when the second sheet material guide member is opened.

The detecting means for detecting the stop of the sheet material engaged with the conveying means, and the connecting means for connecting the driving force transmitted by the driving force transmitting means, the sheet material stop of the detecting means. It is also preferable to operate the connecting means to transmit the driving force to the conveying means when a signal is detected, and the driving force is transmitted only when the sheet material stopped due to a paper jam can be conveyed by the conveying means. However, if the stopped sheet material cannot be conveyed by the conveying means, the driving force is not transmitted to the conveying means, and the unnecessary movement of the next sheet material does not occur.

Further, a conveying means for nipping and conveying the sheet material, a first sheet material guide member for guiding one side of the sheet material in a conveying path along which the sheet material is conveyed by the conveying means, and a first sheet material A second sheet material guiding member that faces the other sheet material guiding member and guides the other surface of the sheet material so that the second sheet material guiding member can take out the sheet material stopped in the conveying path. In a sheet material conveying device which can be freely opened and closed, detecting means for detecting a stop of a sheet material engaged with the conveying means, and a length from a leading end position of the stopped sheet material to the conveying means A length detecting means, and the conveying means drives a predetermined amount according to the length of the sheet material detected by the length detecting means after the sheet material is stopped.

As a result, according to the protruding amount of the stopped sheet material from the conveying means, the conveying path is advanced to the optimum length for the operator to remove the sheet material, or the sheet material is returned to the upstream of the conveying path. Is possible.

The image forming apparatus includes the above-described sheet material conveying device and image forming means for forming an image on the sheet material.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) Hereinafter, a sheet material conveying device according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 5.

The sheet material conveying apparatus 1 is a component for conveying a large number of sheet materials S stacked in a sheet feeding cassette 2 as a sheet material placing means to an image forming unit (not shown) of the image forming apparatus. It works.

FIG. 1 is a side cross-sectional perspective view for explaining the structure of the sheet material conveying apparatus 1, which will be described below based on this figure. The sheet material S is placed on the bottom plate 4 as a stacking base that is pressed by the compression spring 3.

A sheet feeding roller 6 as a conveying means conveys the uppermost sheet material (sheet material Sa) by intermittently rotating it according to an instruction from the image forming apparatus main body. The fixed sheet material Sa is separated by a separation pad 7 provided in front of the sheet feeding roller 6 and the contact portion of the conveyed sheet material Sa in the sheet feeding direction, and fed into the conveyance path H.

The conveying path H has a reversal surface having an outer peripheral surface of the sheet feeding roller 6 as the first sheet material guiding member and a substantially concave reversing curved surface 9 for reversing the sheet material Sa as the second sheet material guiding member. The sheet material Sa passes between the guide member 10 and the sheet material Sa at the downstream of the guide member 10.
It is configured by a pair of upper and lower guide plates 13 and 14 that guide in a direction, and guide plates 18 and 19 that guide to a transfer unit (not shown).

Reference numeral 23 is a gear fixed to the paper feed roller shaft 5, and when the claw member 25 is engaged with the gear 23, the paper feed roller shaft 5 is fixed and the paper feed roller 6 is indicated by an arrow A.
Rotation of both A1 and A2 is prohibited.

When the claw member 25 is not engaged with the gear 23 as shown in FIG. 3, the spring type one-way clutch 21a is used.
The paper feed roller gear 21 (as shown in FIG. 2)
Does not transmit rotation to the feed roller shaft 5 in the direction of arrow A1,
The rotation is transmitted only in the arrow A2 direction.

The claw member 25 is normally engaged with the gear 23 by a biasing means (not shown) as shown in FIG. 1. However, when receiving a signal of a paper jam from a paper jam sensor (not shown) in the vicinity of the reverse curved surface 9, the arm 26 is provided. Is pulled in the direction of the arrow A3 shown in FIG. 1 so that it does not contact the gear 23 as shown in FIG.

Further, the reversing guide member 10 is fixed to the rotating shaft 17 of the fan gear 2 as a driving force transmitting means.
2 is provided, and when the reversing guide member 10 is opened, the fan-shaped gear 22 meshes with the feed roller gear 21 and drives the feed roller gear 21.

FIG. 2 shows the configuration of the sheet material conveying device 1 described with reference to FIG. 1 as viewed from above.

According to the first embodiment, the claw member 25 is released from the engagement state with the gear 23 only when the paper is jammed, so that the sheet material Sa is guided by the reverse guide for removing the paper jam. By the operation of opening the member 10 in the clockwise direction, the fan gear 22 rotates in the clockwise direction, and the paper feed roller gear 21 rotates in the direction of arrow A2 accordingly. Further, the paper feed roller 6 also rotates in the direction of arrow A2. Therefore, the sheet material Sa that has caused the paper jam is sent out in the sheet feeding direction indicated by the arrow A4 (see FIG. 3).

When the reversing member 10 is closed, the feed roller gear 21 and the gear 22 do not mesh with each other, so that the gear 22 does not affect the operation of the sheet material conveying device.

FIGS. 4 and 5 are views for explaining the sheet material removing work in the sheet material conveying apparatus 1 of the present embodiment.

In FIG. 4A, the sheet material Sa enters the conveying path Ha formed by the guide plates 13 and 14 and is jammed by the pair of registration rollers 15 or the sheet jam in the conveying path Ha. That is the case. In this case, by opening the reversing member 10 clockwise, as shown in FIG.
As described above, the sheet material Sa is sent out to the paper feed roller 6 to form a loop and is easily removed, and the jam handling property can be improved.

As shown in FIG. 5A, when the sheet material Sa has entered the reversal guide member 10 and a paper jam has occurred, the sheet material Sa is reversal guide member 10 as in FIG.
The sheet material is sent out by the movement of opening the sheet, and the jam handling property is improved.

When the signal from the paper jam sensor (not shown) is cut off after the paper jam is removed, the claw member 25 is engaged with the paper feed roller gear 21 as shown in FIG. 1, and the paper feed roller gear 21 is spring-loaded. Since the paper feed roller shaft 5 is not driven in the opposite direction by the one-way clutch 21a, the paper feed roller 6 does not rotate in the opposite direction to the paper feed direction due to the action of closing the reversing guide member 10 counterclockwise, so carelessly. The sheet material S is not sent back to.

(Second Embodiment) Next, a sheet material conveying device according to a second embodiment of the present invention will be described with reference to FIGS. 6 to 13. In the second embodiment, the same components as those in the first embodiment are designated by the same reference numerals and treated as the same as those in the first embodiment, and detailed description thereof will be omitted.

The configuration of the sheet material conveying device 41 in the second embodiment will be described with reference to FIGS. 6 and 7. 6 is a cross-sectional perspective view for explaining the configuration of the sheet material conveying device 41, and FIG. 7 is a view of FIG. 6 seen from above.

Referring to FIG. 7, the paper feed roller shaft 5
An electromagnetic clutch 29 as a means for connecting the paper feed roller gear 21 and the driving force is arranged in the. The paper feed roller gear 21 does not normally transmit the drive to the paper feed roller shaft 5, but when the electromagnetic clutch 29 receives a paper jam signal from a paper jam sensor (not shown) provided in the vicinity of the reverse curved surface 9, the paper feed roller gear 21 feeds the paper. The roller gear 21 transmits the drive to the paper feed roller shaft 5.

The gear 28 arranged on the shaft 30 drives the paper feed roller gear 21 via the gear 27 rotatably arranged on the shaft 31. As shown in FIG. 7, the gear 28 is normally located at the position 28a by the tension spring 33, and the reversing member 10
And meshes with the gear 22a among the gears 22a and 22b that function as a plurality of transmission paths fixed at the center of the rotating shaft 17.

Further, the gear 28 is a button 34 (not shown) as a switching means attached to the outer frame side of the reversing guide member 10.
When is pressed, the arm 32 is pulled in the direction of arrow A5, and the arm 32 is positioned at 28b and meshes with the gear 22b.

FIGS. 8A and 8B show gears 22a and 22b.
FIG. 9 is a diagram for explaining the above, in which the gear 22b is provided with a large number of teeth so that the rotation angle of the region in which it meshes with the gear 28 is larger than that of the gear 22a, and the drive amount of the paper feed roller 6 is made different.

Further, the sheet material conveying device 1 has a constitution not shown so that the pressure of the compression spring 3 is released during the opening / closing operation of the reversing member 10 so that the sheet feeding roller 6 and the sheet material S do not come into contact with each other. .

With the above configuration, the sheet material Sa when a paper jam occurs
Is a clockwise rotation of the reversing guide member 10 to remove the paper jam, whereby the gear 22a rotates clockwise,
Along with this, the paper feed roller gear 21 rotates counterclockwise, so that the paper feed roller 6 rotates counterclockwise.
Is fed in the paper feeding direction (see FIGS. 9A and 9B).

Next, the sheet material Sa is rotated by the operation of closing the reversing member 10 counterclockwise while pressing the button 34 attached to the outer frame side of the reversing guide member 10 (not shown).
2b rotates counterclockwise and the paper feed roller gear 21 rotates clockwise accordingly, so that the paper feed roller 6 rotates clockwise in the direction of arrow A1 and is fed back in the counter paper feed direction (FIG. 10). (See (a) and (b)).

Here, the rotation angle of the meshing region of the gear 22b during the operation of closing the reversing guide member 10 with the feed roller gear 28 is the gear 2 during the operation of opening the reversing guide member 10.
It is assumed that the rotation angle is larger than the rotation angle of the engagement area of the sheet feeding roller gear 28 of 2a. That is, the amount by which the sheet material Sa is fed back by the closing operation of the reversing member 10 is larger than the amount by which the sheet material Sa is sent out by the opening operation of the reversing member 10.

During the operation of closing the guide member 10, when the leading edge of the sheet material Sa in the sheet feeding direction is fed back and passes through the nip between the sheet feeding roller 6 and the separating pad 7, the sheet feeding roller 6 is clocked. Even if the sheet material Sa is rotated around, the sheet material Sa is not returned further (see FIG. 10).

However, in this embodiment, the sheet material Sa is used.
When the paper jam is removed from the paper jam state or returned to the inside of the cassette 2, the paper jam signal of the sensor is stopped, the electromagnetic clutch 29 is turned off, and the driving force due to the opening / closing operation of the guide member 10 is cut off. It is possible to prevent the sheet material unrelated to the paper jam from being conveyed by unintentionally rotating the paper feeding roller 6.

Therefore, as shown in FIG. 11A, the guide plates 13,
When the sheet material Sa enters the transport path Ha constituted by 14, and the sheet jams, the reversing guide member 10 is opened, and the sheet material Sa is delivered to the sheet feeding roller 6 as shown in FIG. 11B. , Loops are formed, and it is easy to remove, and the jam handling property can be improved.

Further, FIG. 12 illustrates a processing state when a sheet jam occurs in a state where the sheet material Sa has entered the reversal guide member 10. The sheet material Sa has the same opening action as the sheet material Sa as in FIG. In conjunction with this, the leading edge of the sheet material Sa is sent out, and the jam handling property is improved.

FIG. 13 shows a sheet material Sa to be jammed.
FIG. 6 is a diagram illustrating a method of reusing the sheet material Sa without discarding it by determining whether the sheet material Sa can be removed or returned to the cassette by the reversing operation of the sheet feeding roller 6 depending on the protruding amount of the sheet material Sa. .

FIG. 13A shows a state in which the sheet material Sa has a paper jam, and FIG. 13B shows the reversal guide member 1.
0 is opened in the clockwise direction, and the distance L from the leading end of the fed sheet material Sa in the sheet feeding direction to the position where the sheet feeding roller 6 and the separating pad 7 abut is closed with the reversing guide member 10 in the counterclockwise direction and fed. The reverse guide member 1 when the amount of paper returned is less than or equal to
By closing 0, the sheet material Sa is set again in the cassette, so that the sheet material Sa can be reused without being discarded (FIG. 13C).

The distance L (see FIG. 13B) is compared with the distance of the sheet material fed back by closing the reversing guide member 10 in the counterclockwise direction. Then, the operator determines whether or not the leading edge of the sheet material Sa projects from the mark.
-Therefore, when the reverse guide member 10 is opened when the paper is jammed and the fed sheet material is removed and jammed,
The signal from the paper jam sensor (not shown) is cut off, the electromagnetic clutch 29 is turned off, and the drive is not transmitted from the paper feed roller gear 21 to the paper feed roller shaft 5. Therefore, even if the reversing guide member 10 is closed, the paper feed roller 6 remains It does not rotate in the opposite direction.

However, if it is judged that the front end of the sheet material Sa is in the position where it is returned to the cassette and the sheet material Sa is not removed, the electromagnetic clutch 29 is connected without interruption of the signal from the paper jam sensor. In this state, the sheet material Sa is sent back to the cassette by closing the reversal guide member 10.

When the cassette 2 is of the front loading type, the sheet material S stopped at the position shown in FIG. 13 (a).
When the cassette 2 is pulled out toward the front side, the a breaks due to the interference with the main body frame body.
Since the sheet material Sa is stored as shown in FIG. 13C by the opening / closing operation of the sheet material Sa, the sheet material Sa is not broken by the operation of pulling out the cassette 2.

In the case of the side loading system in which the cassette 2 is pulled out to the left side of the paper, the sheet material Sa stopped at the position shown in FIG. 13A is conventionally stored in the cassette 2 when the cassette 2 is pulled out. Since there is no sheet material Sa, the sheet material is left in the main body and the paper is wasted.
Since the sheet material Sa is stored in the cassette 2 as shown in FIG. 3 (c), it is not wasted because the sheet material Sa is not torn by the drawer of the cassette 2 or left in the main body. (Embodiment 3) A third embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. In this embodiment,
While the first and second embodiments described above are applied to the portion for feeding the sheet material from the cassette, the present invention is applied in the middle of the sheet material conveying path.

FIG. 14 shows a normal operation state of the sheet material conveying device 50 in which no paper jam occurs, FIG. 15 shows a state where the paper jam occurs and the conveyance guide member 53 is being opened, and FIG. 16 shows a paper jam. 2 shows a state in which the sheet guide member is opened to remove the sheet material due to the occurrence of the sheet.

In these figures, 51a, 51b and 52
Reference numerals a and 52b respectively denote a pair of transport rollers for transporting the sheet material Sb, which are driven by a drive unit (not shown).

Reference numeral 51c is a gear fixed to one end of the rotary shaft of the conveying roller 51a. 55 and 56 are conveyance rollers 51
The guide member is arranged upstream of a and 51b and guides the sheet material, and is attached to a casing (not shown).

Reference numeral 54 is a guide member as a first sheet material guide member for guiding the sheet material Sb conveyed by the conveying rollers 51a and 51b. Reference numeral 53 is a guide member as a second sheet material guide member that opposes the guide member 54 and is rotatably attached to a casing (not shown) by a shaft 53a and that can release the conveyance path. Then, the above-mentioned guide members 55, 56 and 53,
By 54, the upstream transport path Hc and the downstream transport path Hd
Are formed.

Further, a sensor 57 for detecting the occurrence of a paper jam is attached immediately before the conveying rollers 51a and 51b.

Reference numeral 58 is an arcuate gear fixed to one end of the rotating shaft 3a of the guide member 53, which rotates in conjunction with opening and closing of the guide member 53 and meshes with the gear 51c.

In such a structure, when the sheet material Sb is carried in by another carrying roller (not shown) upstream from the direction of the arrow A6, the sheet material Sb is carried by the carrying rollers 51a, 5a.
It is carried by 1b and sent to the destination.

The sheet material Sb is the sheet material guide member 5
5, 56, 53, 54 are fed along the sheet material conveying paths Hc, Hd, and the conveying rollers 52a, 52
By b, it is conveyed further downstream in the direction of arrow A7.

If a sheet jam occurs and the sheet material Sb stops near the conveying rollers 51a and 51b, the sensor 5
A paper jam is detected by 7 and the operator is informed by a display means or the like not shown.

When the operator opens the guide member 53 in accordance with the instruction of the display means or the like, the arcuate gear 58 starts to rotate simultaneously, meshes with the gear 51c, and the conveying rollers 51a, 5 '.
The sheet material Sb nipped by 1b is conveyed by the conveyance roller 51.
It is transported so as to proceed downstream of a and 51b and project to the transport path Hd.

The operator removes the protruding sheet material Sb, closes the guide member 53, and recovers from the paper jam.

Here, the arcuate gear 58 and the gear 51c are configured so that the meshing is released at the closed position and the open position of the guide member 53. Therefore, the conveyance rollers 51a, 51a,
In the state where the sheet material is removed from 51b (FIG. 16), the transport roller can rotate without being restricted by the arcuate gear 58.

As described above, even when the paper jam occurs and the leading edge of the sheet material is sandwiched by the transport rollers, the operator opens the guide member to rotate the transport rollers, and the sheet material is rotated. Since the leading edge of the sheet material is conveyed outside so that it protrudes from the sheet feeding path, the operator can easily grasp the leading edge of the sheet material and the sheet material is cut and cannot be removed. It is possible to reduce troubles such as occurrence of.

Further, in the third embodiment described above, the arcuate gear 58 interlocked with the opening and closing of the guide member 53.
Although the sheet material Sb is forcibly discharged by the gear and the gear 51c of the conveying roller, the same action and effect can be obtained by using a driving force transmitting means using a cam or a link, a friction wheel, a wire, or the like. Obtainable.

(Embodiment 4) FIGS. 17, 18 and 19 are cross-sectional explanatory views of a sheet material conveying device 60 according to a fourth embodiment of the present invention, in which the same components as those of the third embodiment are shown. Are given the same reference numerals and treated as the same, and detailed description thereof is omitted.

In the fourth embodiment, the transport roller 61
The motor 62 for independently driving a and 61b is provided. The motor 62 is controlled by a control circuit (not shown), and the control method will be described later.

In FIG. 17, reference numeral 63 denotes a counter circuit which functions as a length detecting means for counting how much the front end of the sheet material Sb has advanced in the direction of arrow A6 after the sensor 57 detects the sheet material Sb. Not connected to the sheet material tip comparison circuit in the main body.

In such a structure, when the sheet material Sb is carried in by another carrying roller upstream from the direction of the arrow A6, it is carried by the carrying rollers 61a and 61b and sent to the destination.

Here, a paper jam occurs and the sheet material Sb
Is stopped in the sheet material conveying path, the counter circuit 6
3 to the main body control circuit, the sensor 57
The leading edge position data of the sheet material Sb obtained by measuring the time from the passage of the sheet material to the stop of the sheet material Sb is sent.
It is compared whether the tip of b is more than 40 mm from the conveyance roller. If it is 40 mm or less, the conveyance roller motor 9 is driven to eject the sheet material tip to 40 mm from the conveyance roller, and if it is 40 mm or more, the operator can easily perform sheet feeding. Since it is possible to process the material, it is possible to use the motor 62 to stop the transport roller 61, such as when the material is stopped as it is.
The a and 61b are driven by a predetermined amount (FIG. 18).

After this sequence is completed, the operator is informed of the paper jam by the display means or the like, and the operator opens the guide member 53 according to the instruction of the display means or the like (see FIG. 1).
9) Since the sheet material Sb is ejected from the conveying rollers 61a and 61b so that the leading end of the sheet material Sb is sufficiently grasped, the operator can easily remove the sheet material Sb. Then, the guide member 53 can be closed to recover from the paper jam.

At this time, the counter circuit 63 is reset. Further, the reset of the counter circuit 63 is reset even after the rear end of the sheet material Sb has passed the sensor 57.

Accordingly, the counter roller 63, which receives the signal from the paper detection sensor after the paper jam has occurred, measures the leading edge position of the sheet material, and the comparison circuit which compares the measured data with a predetermined constant. Since 61a and 61b are rotated by a predetermined amount and the tip of the sheet material protrudes by a predetermined amount from the conveying roller, the operator can easily grasp the tip of the sheet material and the sheet material cannot be removed because it is cut off. It is possible to reduce troubles such as remaining and causing paper jam again.

[0084]

As described above, according to the present invention,
When the paper is jammed, the conveying unit is driven in association with the operation of opening the second sheet material guide member, and the sheet material stopped due to the paper jam is moved from the stop position to improve the paper jam handling property by the operator.

That is, when the amount of protrusion of the front end of the jammed sheet material from the conveying means is small, or when the sheet material is the first
It is to solve the problem that it is difficult to process the jammed sheet material stuck to the sheet material guide member.

Further, by closing the second sheet material guide member, the sheet material is returned to the sheet material placing means by the sheet feeding roller, so that the sheet material is not wasted. In this case, the amount of sheet material conveyed is larger when the second sheet material guide member is closed than when the second sheet material guide member is opened. Therefore, when the stopped sheet material is usable, the second sheet material is conveyed. By repeatedly opening and closing the material guide member, the sheet material can be gradually returned to the sheet material placing means. Therefore,
When the sheet material placing means is configured to be detachable from the apparatus body, the sheet material is prevented from breaking through the sheet material placing means and the apparatus body or remaining on the apparatus body side.

Further, in the case of detecting the sheet material stop signal of the detecting means and activating the connecting means to transmit the driving force to the conveying means, the sheet material stopped due to a paper jam can be conveyed by the conveying means. In this case, the driving force is transmitted and conveyed, so when the stopped sheet material cannot be conveyed by the conveying means, the driving force is not transmitted to the conveying means and the next sheet material is moved unnecessarily. Does not occur.

Further, there is provided a length detecting means for detecting the length from the leading end position of the stopped sheet material to the conveying means,
After the sheet material is stopped, the conveying means drives a predetermined amount according to the length of the sheet material detected by the length detecting means, so that the sheet material is moved in accordance with the amount of protrusion of the stopped sheet material from the conveying means. It is possible for the operator to advance the conveyance path to the optimum length for removal, or to return the sheet material to the upstream side of the conveyance path, thereby improving the workability of removing the sheet material.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a sheet material conveying device according to a first embodiment of the present invention.

FIG. 2 is a top view of the sheet material conveying device according to the first embodiment to which the present invention is applied.

FIG. 3 is a side sectional view of the sheet material conveying device according to the first embodiment to which the present invention is applied.

FIG. 4 is a diagram illustrating an operation of the sheet material conveying device according to the first embodiment to which the present invention is applied.

FIG. 5 is a diagram illustrating an operation of the sheet material conveying device according to the first embodiment to which the present invention is applied.

FIG. 6 is a side sectional view of a sheet material conveying device according to a second embodiment of the present invention.

FIG. 7 is a top view of the sheet material conveying device according to the second embodiment of the present invention.

FIG. 8 is a diagram illustrating a gear.

FIG. 9 is a diagram for explaining the operation of the sheet material conveying device according to the second embodiment to which the present invention is applied.

FIG. 10 is a view for explaining the operation of the sheet material conveying device according to the second embodiment to which the present invention is applied.

FIG. 11 is a diagram for explaining the operation of the sheet material conveying device according to the second embodiment to which the present invention is applied.

FIG. 12 is a view for explaining the operation of the sheet material conveying device of the second embodiment to which the present invention is applied.

FIG. 13 is a diagram illustrating a state in which the sheet material is returned to the cassette.

FIG. 14 is a diagram of a sheet material conveying device according to a third embodiment of the present invention.

FIG. 15 is a diagram of a sheet material conveying device according to a third embodiment of the present invention.

FIG. 16 is a diagram of a sheet material conveying device according to a third embodiment of the present invention.

FIG. 17 is a diagram of a sheet material conveying device according to a fourth embodiment of the present invention.

FIG. 18 is a diagram of a sheet material conveying device according to a fourth embodiment of the present invention.

FIG. 19 is a diagram of a sheet material conveying device according to a fourth embodiment of the present invention.

FIG. 20 is a diagram of a conventional sheet material conveying device (during normal conveyance).

FIG. 21 is a view of a conventional sheet material conveying device (when the guide member is released).

[Explanation of symbols]

 1,41 2 Cassette 3 Compression spring 4 Bottom plate 5 Paper feed roller shaft 6 Paper feed roller 7 Separation pad 9 Inverted curved surface 10 Guide member 13 Guide plate 14 Guide plate 15 Registration roller pair 18 Guide plate 19 Guide plate 21 Feed roller gear 21a Spring type one-way clutch 22 Fan-shaped gear 23 Gear 25 Claw member 26 Arm 27 Gear 28 Gear 29 Magnetic clutch 30 Shaft 33 Extension spring S, Sa, Sb Sheet material H, Ha, Hc, Hd Transport path

Claims (6)

[Claims] 1. A conveying means for nipping and conveying a sheet material; a first sheet material guide member for guiding one surface of the sheet material in a conveying path along which the sheet material is conveyed by the conveying means; A second sheet material guiding member that faces the other sheet material guiding member and guides the other surface of the sheet material so that the second sheet material guiding member can take out the sheet material stopped in the conveying path. A sheet material conveying device provided so as to be openable / closable, comprising a driving force transmitting means for driving the conveying means by opening / closing operation of the second sheet material guiding member. 2. The conveying means is a sheet feeding roller that comes into contact with a sheet material placed on the sheet material placing means and feeds the sheet to a conveying path, and the driving force transmitting means is a second sheet material. When the guide member is opened, the paper feed roller is rotated in the forward direction to advance the sheet material in the conveying direction, and when the second sheet material guide member is closed, the paper feed roller is rotated in the reverse direction to load the sheet material onto the sheet material. The sheet material conveying device according to claim 1, wherein the sheet material conveying device is returned to the placing means. 3. The driving force transmission means comprises a plurality of transmission paths having different drive amounts of the conveying means, and switching means for switching the transmission paths. By operating the switching means, the second driving path is provided. The sheet material conveying device according to claim 2, wherein a driving amount when the sheet material guiding member is closed is larger than a driving amount when the sheet material guiding member is opened. 4. A sheet material stop of the detection means, comprising: a detection means for detecting the stop of the sheet material engaged with the conveying means; and a connecting means for the driving force transmitted by the driving force transmission means. 4. The sheet material conveying device according to claim 1, wherein when the signal is detected, the connecting means is operated to transmit the driving force to the conveying means. 5. A conveying means for sandwiching and conveying the sheet material, a first sheet material guide member for guiding one surface of the sheet material in a conveying path along which the sheet material is conveyed by the conveying means, and A second sheet material guiding member that faces the other sheet material guiding member and guides the other surface of the sheet material so that the second sheet material guiding member can take out the sheet material stopped in the conveying path. In a sheet material conveying device provided to be openable and closable, detecting means for detecting the stop of the sheet material engaged with the conveying means, and detecting the length from the leading end position of the stopped sheet material to the conveying means A sheet material conveying device comprising: a length detecting means, wherein the conveying means drives a predetermined amount according to the length of the sheet material detected by the length detecting means after the sheet material is stopped. 6. An image forming means for forming an image on a sheet material, and the sheet material conveying device according to claim 1, 2, 3, 4 or 5. Image forming apparatus.