JPS63171737A - Sheet separating and feeding device - Google Patents

Abstract

PURPOSE:To prevent a paper jam and a feeding failure from occurring, by making a conveyor roller and a separate roller into a noncontact state when an original detecting sensor failes to detect an original, and when the sensor detects the original, making the conveyor roller and a feed roller into the noncontact state likewise. CONSTITUTION:An automatic sheetlike original feeder 21 is provided with a conveyor roller 29, to be rotated so as to feed each original P toward the side of a conveyor roller pair 26 from the side of an original mount 22, and a separate roller 36, to be rotated in the opposite direction to the feeding direction of the original P, and a feed roller 37 to be situated in almost parallel with both sides in the axial direction of the separate roller 36. In addition there is provided with an original detecting sensor 52 in close proximity to the front side in the feeding direction of the original P. When the original P is not detected by this sensor 52, the roller 29 and the roller 36 are made into a noncontact state, while the roller 29 and the roller 37 are also made into the noncontact state. And, when the sensor 52 detects the original, the roller 29 and the roller 36 are made into a contact state and simultaneously the roller 29 and the roller 37 are made so as to be the noncontact state in design.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Utilization The present invention relates to a separating and feeding device for sheet materials, and more specifically, it relates to a separating and feeding device for sheet materials, and more specifically, for handling a large number of sheets in a stacked state in electronic copying machines, facsimile machines, image reading devices, etc. An automatic sheet document feeder for automatically feeding sheet documents one by one to a document illumination section or a document reading section, or multiple sheets of copy paper stacked in a stack in an electronic copying machine, printing machine, etc. The present invention relates to a C-i phase separation feeding device such as a transfer paper automatic feeding device for automatically feeding printing paper one by one to a transfer unit or the like.

(B) Conventional technology Conventionally, as a heel sheet material separation and feeding device, a conveying roller 1 rotating in the vR feeding direction of the sheet material P shown in FIG.
Friction pad system in which the and separation pad 2 are brought into contact with each other, and a friction vibration roller in which a conveying roller 1 rotating in the conveying direction of the sheet material P and a separating roller 3 stopping or reversing are brought into opposing contact with each other as shown in FIG. This system consists of a pair of upper and lower endless belts 5 and 6 that are in contact with each other as shown in FIG. Driving to W
A moving flexible belt type one, and the 8th one.
- Consists of a plurality of narrow endless endless belts 7.9 arranged vertically alternately as shown in Fig. 10, each upper belt 7 is driven to run in the conveyance direction of sheet material P, and each lower belt 9 is stopped. Alternatively, there is a belt separation method that utilizes the stiffness of the sheet material P that is driven to run in the opposite direction. In each of the above figures, the reference numeral 10 indicates a pair of transport rollers, the reference numeral 11 indicates a pickup roller, and
Reference numerals 12 and 15 and 13 and 16 indicate a driving pulley and a driven pulley, respectively.

However, in any of the above methods, the sheet material P
is separated by a separation member such as a separation pad 21 minutes #4-ra 32 separation belt 6.9, and is fed forward by a conveyance member such as a conveyance roller 1 and conveyance belts 5 and 7.
Since the separation member is stopped or rotated or driven in the opposite direction, as shown in FIG.
The leading end of the sheet material P is bent or torn due to collision with the separation member, and as a result, the sheet material P is at the contact point or meeting point between the conveyance member and the separation member,
That is, there was a drawback that it could not move toward the nip portion, making it impossible to separate and feed the sheet material P. This drawback is especially true for 1 horse! It easily appears on the sheet material P,
This was the biggest weakness of this type of sheet material separation and feeding system that uses friction.

Therefore, in order to eliminate the above-mentioned drawbacks, recently, as shown in FIG. Low g! A rubbing member 17 is provided, and the low! ! ! ! Rubbing member 1
7 to avoid collision between the sheet material P and the separation roller 3, or as shown in FIG. The above conveying roller 1 is connected to the sheet material P.
At the same time, the separating roller 3 is rotationally driven in the reverse direction via the torque IJ = torque 19 and the transmission mechanism 20 having the structure shown in FIG.
As shown in Fig. 5, when there is no sheet material P between the conveyance roller 1 and the separation roller 3, the separation roller 3 is forcibly moved in the conveyance direction of the sheet material P by the frictional force with the conveyance roller 1. (see Fig. 15 ■), and a plurality of sheets, for example two sheets P, are placed between the conveyance roller 1 and the separation roller 3.
When P2 is clamped, as shown in FIG.
The friction coefficient μ3 between the sheet materials P, P2, and the friction coefficient μ2 between the separation roller 3 and the sheet material P2 μm〉μ2
> Due to the relationship μ3, the sheet material P1 in contact with the double feed roller 1 is sent in the conveying direction, and the rate material P2 in contact with the separation roller 3 is reversed by the separation roller 3 via the torque limiter 19 and the transmission mechanism 20. If the sheet material P is returned to the opposite side to the conveyance direction to prevent double feeding (see Fig. 15 ■) and only one sheet material P is properly held between the conveyance roller 1 and the separation roller 3, the 16th As shown in Figure 2, due to the above relationship of friction coefficient μm>μ2, the sheet material P is conveyed in the conveying direction by the conveying roller 1 and the separation roller 3 which is forcibly rotated in the conveying direction (see Figures 15 ■ and ■). , and when a plurality of sheet materials P are dragged by the conveyed sheet material P and are again sandwiched between the conveyance roller 1 and the separation roller 3, the same procedure as in the case of FIG. , the sheet materials P other than the sheet materials P in contact with the conveyance roller 3 are returned to the opposite side to the 9 conveyance direction by reversing the separation roller 3 (15th
A system configured as shown in Figure 2) has been proposed.

(c) Problems to be solved by the invention By the way, in the above-mentioned one shown in FIG. 12, the low friction member 1
7 is installed slightly in front of the suppressing contact area between the conveyance roller 1 and the separation roller 3, that is, the nip area, the sheet material P will still be bent due to collision with the separation roller 3, so the If the effect of providing the friction member 17 cannot be expected, and conversely, if the low friction member 17 is installed in such a manner that it has entered the nip, the function of the separation roller 3 will be completely lost. Close, low g friction member 17
There has been a drawback that it is technically extremely difficult to appropriately arrange the nip portion in the vicinity of the nip portion.

In addition, in the case of FIG. 13 described above, the friction coefficient It, l11 between the conveyance roller 1, the separation roller 3, and the sheet material 2 is
2, separation pressure and torque limiter 19 operation settings!・It is very difficult to set the relationship with torque limiter 1.
Even if the appropriate value of the operating setting torque of 9 is experimentally determined,
It may not be easy to actually manufacture a torque limiter with such an operating setting torque, and even if it were possible, the operating setting torque of the Torque 'JE Tsuta would change over time and would not maintain its original value. The drawback was that it was extremely difficult.

Furthermore, in a system in which the conveyance roller 1 and the separation roller 3 are always pressed into contact with a predetermined pressing force as shown in FIGS. 12 and 13, a wedge leading to the nip portion is formed as shown in FIG. 17. There is a drawback that it is extremely difficult for the sheet material P to pass between the rollers 1 and 3 after passing through the rollers 1 and 3. Furthermore, in conventional separation feeding systems, including those shown in FIGS. Sheet material P of the conveying member and separating member in a wedge part that is narrower than a curved part or a straight part where they come into contact, such as rollers, belt-to-roller, belt-to-belt, etc.
Since the conveyance and separation of the sheet material P was determined by unstable contact with the sheet material P, there was a fundamental drawback that the conveyance and separation of the sheet material P were performed extremely unstablely.

B) Means for solving the problem The present invention aims to solve the above-mentioned problems,
The sheet material is placed on the downstream side in the sheet material feeding direction between a conveying member that rotates in the direction in which the sheet material is fed and a separation member that rotates in the opposite direction to the sheet material feeding direction and is movable toward and away from the conveying member. A detection means is provided, and a feeding member is provided which is movable toward and away from the conveyance member and rotates in a direction to feed the sheet material, and when the sheet material is not detected by the detection means, the conveyance member is moved toward and away from the conveyance member. The conveying member and the feeding member are brought into contact at the same time as the member and the separating member are brought into a non-contact state, and when the sheet material is detected by the detecting means, the conveying member and the separating member are brought into contact with each other, and at the same time It is characterized in that the conveying member and the feeding member are configured to be in a non-contact state.

(Candy) Effect By employing the above means, when there is no sheet material between the conveying member and the separating member, the conveying member and the separating member are separated by a predetermined distance, and both the conveying member and the feeding member are able to separate the sheet material. Since it rotates in the feeding direction, even if several sheet materials are conveyed in a superimposed state by, for example, a pickup roller, these sheet materials are actively conveyed by the conveying member and the feeding member. When the sheet materials pass through the gap between the conveyance member and the separation member and one of the sheet materials is detected by the detection means 1, the feed member is separated from the separation member, and the conveyance member and the The separating member is separated from the member by a predetermined distance, and moves toward the conveying member, so that the conveying member and the separating member come into contact with each other with a predetermined pressing force. Then, the sheet material in contact with the conveying member is conveyed in the feeding direction by the conveying member due to the frictional contact force between it and the conveying member, and the sheet material in contact with the separating member is conveyed in the feeding direction by the frictional contact force between it and the separating member. One sheet material that is returned by the separating member in the opposite direction to the feeding direction and finally left between the transporting member and the separating member is Based on the fact that the frictional contact force between the sheet materials is greater than
Sent in the feeding direction. In this way, the stacked sheet materials are separated one by one and fed to the next stage of work process, etc.

(F) Embodiments Hereinafter, embodiments embodying the present invention will be described with reference to the drawings.

As shown in FIG. 1, the automatic sheet document feeder 21 separates and feeds the sheet documents g4P, which are stacked in large numbers on the document placement table 22, by the tentative action of the surprise roller 23. The sheet-like originals [P] are conveyed toward the document separation/feeding section 25 and separated one by one in the document separation/feeding section 25, and are then fed to the downstream document reading section, etc. ing.

As shown in detail in FIG. 2, the document separation and feeding section 25 transports the sheet-like original g4P from the original \i4@M table 22 side to the transport roller pair 26 side using a drive source (not shown) fixed to a shaft 27. A feeding roller 2 rotated to feed toward
9, a shaft 30 disposed opposite to the roller 29 by a drive source (not shown), a driving pulley 31 fixed to the shaft 30, a transmission belt 32 wound around the pulley 31,
A driven pulley 33 is rotated by the belt 32, and a separating roller 36 is rotated in a direction opposite to the feeding direction of the sheet document P via a shaft 35 to which the pulley 33 is fixed. Feed rollers 37° 37 are disposed opposite to the roller 29 on the lower side and are located substantially parallel to each other on both sides of the separation roller 36 in the axial direction, and both axial ends of the shaft 35 to which the separation roller 36 is fixed are provided. The lever members 39 and 39 are rotatably supported on one end side of the lever members 39 and 39, respectively, which can swing around a shaft 30, and the feed rollers 37, 37 are each pivoted around a fixed shaft 40. Another swingable lever member 41. A shaft 42 is rotatably attached to one end of 41.
42.

On the other end sides of the lever members 39 and 39 and the other lever members 41 and 41, there are provided lever members 39 and 3, respectively.
A rod-shaped connecting member 4 connects 9 and 41, 41.
3.45 is fixed, and a link member 4.6.46 is connected to connect the coupling member 43 and the coupling member 45.
has been set up.

Further, a solenoid means 47 is disposed on one side of the coupling member 43, and the plunger 4 of the solenoid means 47
9 and the coupling member 43 are connected via a link spring 50, and on the other side of the coupling member 45, a tension spring 51 is tensioned between the coupling member 45 and an appropriate fixing part of the device main body. When the means 47 is energized, the plunger 49 is retracted against the tension spring 51, and the lever members 39, 39 are rotated counterclockwise about the shaft 30 via the link spring 50. At the same time that the separation roller 36 comes out of contact with the conveyance roller 29, another lever member 41, 41 is moved counterclockwise around the shaft 40 via the coupling member 43, the link members 46, 46, and the coupling member 45. When rotated, the feed rollers 37, 37 come into contact with the conveyance roller 29, and when the solenoid means 47 is not energized, the plunger 49 is in an extended state, and the spring force of the tension spring 51 causes the coupling member 45 to , the lever members 39, 39 are rotated clockwise about the shaft 30 via the link members 46, 46 and the coupling member 43, and the separation roller 36 is brought into contact with the conveyance roller 29 with a predetermined pressing force. , the lever member 41 via the coupling member 45
, 41 are similarly rotated clockwise about the shaft 40, so that the feed rollers 37, 37 are brought out of contact with the conveyance roller 29.

Furthermore, as shown in FIG.
A sheet document detection sensor 52 of an appropriate method such as a photoelectric method, an ultrasonic method, or a contact method is disposed adjacent to the downstream side), and the detection action of the sheet document 74P by the sensor 52 causes When the solenoid means 47 described above becomes de-energized, the pickup roller 23 is separated upward from the sheet-like original gIIP on the document mounting table 22 by energizing the solenoid means (not shown).

The sheet-like automatic document feeder 21 described above is incorporated into the document reading device 53 in a manner as shown in FIG.

In addition, in FIG. 1, the part indicated by the reference numeral 55 at the bottom of the document placement table 22 is rotated by the sheet document P placed on the document placement table 22, and is rotated to detect the presence or absence of a sheet document (not shown). This is a sensor lever member that turns on the detection sensor.

Since the present embodiment has the above-described configuration, a large number of sheet documents P are placed on the document placement table 22, and the sensor lever member 55 is rotated to activate the sheet document presence detection sensor (not shown). When the feeding of the original sheet P is commanded with the switch turned on, the pickup roller 23 is lowered onto the stacked sheet originals P and is rotated, and feeding of the sheet original P is started. (See Figure 4 ■). Then, while the sheet-like original iP has not yet been fed between the conveyance roller 29 and the separation roller 36, which have also started rotating, the solenoid means 47 is in an excited state, and the separation roller 36 is spaced apart from the conveyance roller 29 by a predetermined distance, and the feed roller 37 is in contact with the conveyance roller 29 and rotated in the feeding direction of the sheet-like original P. Even if the sheet documents P are fed in a superimposed state, the sheet documents P smoothly pass through the gap between the conveyance roller 29 and the separation roller 36 by the conveyance roller 29 and the feed roller 37 (see FIG. 4, ■). . When any one of the sheet documents P passing through the gap between the transport roller 29 and the separation roller 36 is detected by the sheet document detection sensor 52, the solenoid means 47 becomes de-energized.
The feed roller 37 is moved to the conveyor roller 29 by the tension spring 51 etc.
At the same time, the separating roller 36 is separated from the conveying roller 2.
9 with a predetermined pressing force.

Then, among the several sheet documents P held between the conveyance roller 29 and the separation roller 36, the conveyance roller 29
The sheet-like original P that has come into contact with the transport roller 2
The sheet-like document P is conveyed in the feeding direction by the frictional contact force with the separation roller 36 and is returned in the opposite direction to the feeding direction by the frictional contact force with the separation roller 36. (See Figure 4■). In this way, only one sheet of original fa% P is finally left between the transport roller 29 and the separation roller 36. Separation roller 3
Based on the fact that the frictional contact force is greater than the frictional contact force caused by 6, the document is fed to the next stage sheet-like document reading section (see Figure 4 ■).
. When the first sheet document P leaves the detection action of the sensor 52, the solenoid means 47 is energized again, the separation roller 36 is separated from the conveyance roller 29, the feed roller 37 is raised, and at the same time the pickup roller 23 is lowered (see Fig. 4 ■), and the above-mentioned steps ■ to ■ are repeated again to form the laminated sheet material [P
are sequentially fed one by one to the document reading section.

In the above-mentioned embodiments, the solenoid means 47 which is in an energized state is turned into a de-energized state by the ON operation of the sheet-like original detection sensor 52 has been described. For example, in FIG. The solenoid means 47 may be configured to be energized by the ON operation of the sheet-like original detection sensor 52 by reversing the position of the tension spring 51. Alternatively, the link members 46, 46 may be omitted and the lever member 39 and the lever member 41 may be operated by separate solenoids. Furthermore, although the separation and feeding section 25 has been described using the conveyance roller 29, the separation roller 36, and the feed roller 37, a belt may be used instead.

(G) As described in detail, according to the present invention, there is a conveying member that rotates in the direction of feeding the sheet material, and a conveying member that rotates in the opposite direction to the feeding direction of the sheet material and is in contact with the conveying member. A sheet material detection means is disposed on the downstream side in the sheet material feeding direction of the separation member that is freely displaceable, and a feeding member that is movable toward and away from the conveying member and rotates in the direction of feeding the sheet material. is provided, and when the sheet material is not detected by the detection means, the conveyance member and separation member are brought into a non-contact state, and at the same time the conveyance member and the feeding member are brought into contact, and the sheet material is detected by the detection means. When detected, the conveying member and the separating member are brought into contact and at the same time the handling member and the feeding member are brought into a non-contact state, so that % of the sheet material collides with the reversing separating member. Since it is always conveyed by the conveying member and the feeding member, and is securely clamped by the conveying member and the separating member before being separated and fed, jams and feeding defects are prevented, and defects, especially at the tip, are prevented. It is now possible to feed even thin and stiff sheet materials, and there is no mechanism that requires delicate installation work or adjustment work, and it is mechanically easy to feed. Since it is extremely easy to manufacture and there is no risk of deterioration over time, it is possible to obtain a sheet material separation and feeding device that is inexpensive, easy to handle, and has stable performance.

[Brief explanation of the drawing]

1 to 4 are views relating to the sheet material separation and feeding device according to the present invention, in which FIG. 1 is a side sectional view of the main part thereof, FIG. 2 is a perspective view of the main part thereof, and FIG. 3 is a sheet document reading device. An application diagram to the device, and FIG. 4 shows an explanatory diagram of its operation, and
5 to 15 respectively show the main structure of a conventional sheet material separation and feeding device, and FIGS. 16 and 17 show general operation diagrams. 21... Sheet material separation and feeding device W (sheet-like document automatic feeding device), 29... Conveyance member (conveyance roller),
36...Separation member (separation roller), 37...Feeding member (feeding roller), 52...Sheet material detection means (sheet-shaped document detection sensor), P...Sheet material (rate-shaped document).

Claims (1)

[Claims] (1) Rate material separation and feeding comprising: a conveyance member that rotates in the direction of feeding the sheet material; and a separation member that rotates in the opposite direction to the sheet material feeding direction and is displaced so as to be able to come into contact with the conveyance member. In the apparatus, a sheet material detection means is disposed downstream of the conveyance member and the separation member in the sheet material feeding direction, and is movable towards and away from the conveyance member and rotates in the direction of feeding the sheet material. When a feeding member is provided and the sheet material is not detected by the detecting means, the conveying member and the separating member are brought into a non-contact state, and at the same time, the conveying member and the feeding member are brought into a contact state, and the detecting means A sheet material separation and feeding device characterized in that, when a sheet material is detected, the transporting member and the separation member are brought into contact with each other and at the same time the transporting member and the feeding member are brought into a non-contact state. .