JPH0829882B2 - Sheet transfer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention relates to a sheet conveying apparatus which is applied to an automatic document feeding / discharging apparatus mounted on a copying machine and which conveys a sheet such as an original.

(Prior Art) In recent years, many copying machines for copying an original image have been put into practical use, which are provided with an automatic original feeding / discharging device.

In this type of automatic document supply / discharge device, normally, the document set on the document placing portion is fed onto the document placing glass at the copy position by the rotation of the conveying roller driven through the driving force transmitting means. It has become a structure.

Further, in order to reliably transmit the rotational force of the above-mentioned transport roller to the document, a pressing roller (pinch roller) is provided facing the transport roller, and the document is sandwiched between these.

For this reason, when a so-called jam phenomenon (hereinafter, simply referred to as a jam) in which a document is jammed due to some reason occurs, the document cannot be removed without difficulty in this state,
The original may be damaged.

For this reason, conventionally, a jam clearing means has been provided so that the jammed document can be pulled out without difficulty.

That is, in the prior art, as the jam releasing means, a) a mechanism for forcibly separating and holding the pressure contact portion (nip portion) of the roller via a lever or the like, b). A mechanism for displacing one roller with a solenoid during operation of the device and pressing it against the fixed side, cutting off the energization of the solenoid during jamming and separating the rollers, c). During operation of the device, a solenoid is energized to press the stationary side with an eccentric cam, and when jammed, the cam is displaced by the inertial force of the drive system to separate the rollers.

(Problems to be Solved by the Invention) However, in the case of a), the number of one-step operations is increased, and not only the operability is deteriorated, but also a jam occurs due to an erroneous operation during normal conveyance. Further, the type b) requires a space around the control axis and requires electrical control,
The cost will increase. In addition, since the item (c) is subject to inertial force, it has a defect that it is not suitable for a small device, and there is no satisfactory one at present.

The present invention has been made based on the above circumstances, and an object of the present invention is to perform a sheet jam treatment without requiring a special operation and to have excellent operability, and to provide a compact and inexpensive sheet conveying device. It is the one we are trying to provide.

[Structure of the Invention] (Means for Solving Problems) The present invention has been made based on the above-mentioned problems, and includes a driving source that generates a driving force, a conveyance roller that conveys a sheet in a predetermined direction, A rotary shaft having the carrying roller attached thereto and rotating together with the carrying roller, a driving force transmitting means for transmitting the driving force generated from the driving source to the carrying roller, and a drive of the driving force transmitting means. A spring clutch mechanism provided on the input side and coaxial with the rotary shaft; a first one-way clutch coupled to the output end of the spring clutch mechanism and coaxial with the rotary shaft; The present invention provides a sheet conveying device characterized by comprising an on / off control means for controlling the on / off of a spring clutch mechanism.

(Operation) According to the sheet conveying apparatus of the present invention, the rotating shaft of the conveying roller connected to the drive source via the spring clutch and the first one-way clutch is controlled by the intermittent control means.
During document transport, while rotating only in a predetermined direction controlled via a second gear of a second one-way clutch that meshes with gears on the outer periphery of the first one-way clutch and a spring clutch, When the document is jammed, the spring clutch is released to allow the document to rotate in any direction. That is, when the driving force is supplied from the drive source to the rotary shaft, only rotation in one direction (drive input in one direction) is possible, and rotation in any direction is possible from the output side of the drive source. Can be given. As a result, even when a document jam occurs, the document can be jammed without requiring a special operation, and the operability is improved. Further, since the sheet conveying apparatus of the present invention can be arranged in a small space around the rotation axis of the conveying roller, the compact sheet conveying apparatus can be provided.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 shows the appearance of a copying machine equipped with an automatic document feeding / discharging device to which the sheet conveying device of the present invention is applied. In the figure, 1 is a copying machine and 2 is an automatic document feeding installed on the upper surface of the copying machine 1. It is an ejector.

As shown in FIG. 2, the automatic document feeding / discharging device 2 is mounted at its rear end side via hinges 3 and 3 so that it can be opened upward as required. The upper surface of the original placing glass 4 can be opened.

Further, the automatic document feeder / discharger 2 has an upper cover 2a.
In addition to the state that the document placing section 5 having the guides 5a, 5a and the discharged document receiving section 6 are provided on the upper surface of the
Inside, that is, on the upper surface side of the lower cover 2b, as shown in FIG. 3, an original document feeding / conveying means 7 for taking in and conveying the original document P which is a sheet fed from the original document placing portion 5.
Then, the original P taken in by the original taking-in / conveying means 7 is guided onto the original placing glass 4 and the original P after the exposure operation.
The document conveying / discharging means 8 for discharging the document to the discharged document receiving portion 6 and the driving force transmission system 10 having a motor 9 shown in FIG. 4 as a driving source are incorporated.

As shown in FIG. 5, the document taking-in / conveying means 7 has a structure in which the conveying roller 1 is arranged in the vicinity of the taking-in port 18 and the pressing rollers 12 and 13 are in rolling contact therewith. The document conveying / discharging means 8 is composed of conveying rollers 14, 1 facing the document placing glass 4 side through a through hole formed in the lower cover 2b.
5, 16 and the transport roller 17 arranged near the discharge port 19
It has a configuration having.

Further, the document detecting means 20 is provided in the vicinity of the document receiving and conveying means 7.
Is provided for detecting the conveyed document P.

Further, the rotational force of the motor 9 is transmitted through the belt 25, the pulley 26, the belt 27, and the pulley 40 to the conveying rollers 11, 14, 15, 1, 1.
6 and 17, the operations of feeding, aligning, and discharging the document P are performed by controlling the forward and reverse rotations of the motor 9.

Further, the original document feeding and conveying means 7 is an application of the sheet conveying device of the present invention, and the driving force transmitting means 30 is the sixth means.
As shown in the figure, a spring clutch mechanism 31 provided on the drive input side, a one-way clutch 32 connected to the output end of the spring clutch mechanism 31, and the spring clutch mechanism 31 and the one-way clutch 32 are supported. Along with the rotary shaft 33 to which the conveying roller 11 is attached, and an interruption control means 34 for controlling the interruption of the spring clutch mechanism 31.
And a drive input in one direction are transmitted, and a low load rotation can be performed in both directions with respect to a reverse input from the power output side.

Further, the intermittent control means 34 includes a spring clutch mechanism 31.
Gear part 35a integrally formed on the outer periphery of the sleeve 35 of
In addition, a gear 38 supported by a fixed shaft (stud) 36 via a one-way clutch 37 is always meshed.

FIG. 7 is an exploded perspective view of the driving force transmitting means 30 shown in FIG. 6, in which 40 is a pulley around which the belt 27 is wound, 41 is a boss, 42 is a clutch spring, and 43 is an arbor. Is.

Next, the operation of taking in and conveying the original P will be described with reference to FIGS.

First, when the document P is placed and inserted along the guides 5a, 5a on the document placing portion 5, the document detecting means 20 operates and the motor 9 rotates counterclockwise in the state of FIG. 3 to rotate the belt. The pulley 40 is rotated counterclockwise in the drawing via the 25, the pulley 26, and the belt 27. The engaging portion 40a integrally protruding from the pulley 40 engages with the adjacent boss 41 to transmit the rotational force.

Further, the rotation of the boss 41 is transmitted to the clutch spring 42 whose inner peripheral surface is in contact with the cylindrical surface 41a of the boss 41, and further,
Cylindrical surface 43 with which the inner peripheral surface of this clutch spring 42 contacts
is transmitted to the arbor 43 having a. The rotation of the arbor 43 is transmitted to the one-way clutch 32 in which the protrusion 32a is engaged with the engaging portion 43b of the arbor 43.

At this time, the one-way clutch 32 is
The conveyance roller 11 which is locked with respect to 33 and is integrally fixed to the rotary shaft 33 is rotated in the document taking-in direction (counterclockwise in the state of FIG. 3). As a result, the conveying roller 11 and the pressing roller 1 urged by a leaf spring (not shown) thereto.
The original P inserted in the contact portion (nip portion) is taken in and conveyed so as to be fed onto the original placing glass 4 by the cooperative action with 2, 13.

When the clutch spring 42 rotates in the above operation, the protrusion 42a of the clutch spring 42 is a sleeve integrally formed with the gear 35a.
Since it is engaged with the groove 35b of the sleeve 35, the sleeve 35 is rotated in the same direction. The gear portion 35a of the sleeve 35 meshes with the gear 38 attached to the fixed shaft 36 fixed to the frame, and the protrusion 37
The torque is transmitted to the one-way clutch 37 with a. Since the one-way clutch 37 is free with respect to the fixed shaft 36, the gear 38
Will idle on the fixed shaft 36. (Refer to FIG. 8) Then, after a certain period of time after the trailing end of the document P transported by the transport roller 11 and the pressure rollers 12 and 13 rollingly contacting the transport roller 11 has passed the document detecting means 20 (the progress of the document P). When the rear end in the direction passes the original exposure reference portion of the glass holder 50 shown in FIG. 2 for holding the original placing glass 4 and it can be conveyed for about 15 mm), the motor 9 is stopped and immediately the motor 9 is stopped.
Rotates in the opposite direction (clockwise in the state of FIG. 3),
The original A is conveyed by about 30 mm toward the end surface of the glass holder 50 and aligned. The details will be described below.

When the motor 9 rotates in the clockwise direction, the conveyor roller 16 is rotated via the belt 25 and the pulley 26, and the conveyor rollers 14 and 15 are further rotated in the clockwise direction via the belt 27 so that the rear end of the document P is placed. The glass 4 is transferred toward the glass holder 50 which positions and fixes the glass 4, and the original A is aligned. At this time, as shown in FIG. 9, the belt 27 moves in the direction of the arrow, and its rotational force is transmitted to the adjacent boss 41 via the engaging portion 40a integrally protruding from the pulley 40. Cylindrical surface 41a of boss 41
Is in surface contact with the inner surface of the clutch spring 42, and the clutch spring 42 is in surface contact with the cylindrical surface 43a of the arbor 43.
Since it is engaged with the groove portion 35b, the sleeve 35 tries to rotate in the same direction. However, the gear portion 35a of the sleeve 35 transmits the rotational force to the gear 38, which is integrally held via the protrusion portion 37a, with respect to the one-way clutch 37 attached to the fixed shaft 36 fixed to the frame. And

However, since the one-way clutch 37 is locked with respect to the fixed shaft 36 with respect to the counterclockwise rotation, the gear 38 remains stopped on the rotating shaft 36, so that the sleeve 35 cannot rotate and stops. Keep the state. Therefore, the spring clutch mechanism 31
Is in a so-called power-off state, the cylindrical surface 41a of the boss 41 slides while making surface contact with the inner surface of the clutch spring 42, and the transport roller 11 moves during the document alignment operation in which the motor 9 rotates clockwise. And pressing rollers 12, 13
Will remain stopped.

If the leading edge of the document P does not reach the document detecting means 20 within a certain time, or if the trailing edge of the document P does not pass the document detecting means 20 within a certain time, it is determined that the document is abnormally conveyed and the copying machine 1 is operated. / Document jam is displayed on the display unit 51 and the motor 9 is controlled to stop. The document jam clearance will be described below.

As described above, there are two patterns of the document jam (abnormal document conveyance), one of which is the document jam that occurs when the leading edge of the document P does not reach the document detecting means 20 within a certain time, that is, the first document jam. As shown in FIGS. 10A and 10B, most of the trailing end portion of the document P in the traveling direction is on the document placing portion 5, and the jammed document A can be removed without opening the automatic document feeding / conveying device 2. It is a pattern in the state.

At this time, the original P is conveyed by the conveying roller 11 and the pressing roller 1 pressed against the conveying roller 11 by a leaf spring (not shown).
When the original P is pulled in the direction of the arrow in the drawing, the original P has a force to rotate the conveying roller 11 and the pressing rollers 12 and 13, and the conveying roller 11
A rotating force is also applied integrally to the rotating shaft 33 to which is attached.

However, by adopting the driving force transmitting means 30 of the present invention, the jammed document A can be removed by only pulling the document A in the arrow direction with a small force.

That is, since the one-way clutch 32 held by the rotary shaft 33 is locked with respect to the rotary shaft 33, the movement of the rotary shaft 33 is transmitted to the one-way clutch 32, and the protrusion 32a of the one-way clutch 32 is arbored. It engages with the engaging portion 43b of 43, and the arbor
Reported to 43.

The cylindrical surface 43a of the arbor 43 tries to transmit the rotational force by making surface contact with the inner surface of the clutch spring 42, but since the protrusion 42a of the clutch spring 42 is engaged with the groove portion 35b of the sleeve 35, the sleeve 35 is the same. Try to rotate in the direction. However, the gear portion 35 of the sleeve 35 has a protruding portion with respect to the one-way clutch 32 attached to the rotating shaft 36 fixed to the frame.
An attempt is made to transmit a rotational force to the gear 38 that is integrally held via 37a. However, since the one-way clutch 37 is locked with respect to the rotary shaft 36 during counterclockwise rotation, the gear 38 remains stopped on the fixed shaft 36, and the sleeve 35 cannot rotate and thus remains stopped. . Therefore, the so-called spring clutch mechanism 31 is in a power-off state,
The cylindrical surface 43a of the arbor 43 slides while making surface contact with the inner surface of the clutch spring 42. Therefore, the jammed document A can be easily removed with a small force.

Further, in the case of a document jam that occurs when the trailing edge of the document P does not pass through the document detecting means 20 within a certain time which is another document jam occurrence pattern, that is, FIG. 11A.
Also, as shown in FIG. 11B, most of the leading end of the original P in the traveling direction is on the original placing glass 4 between the copying machine 1 and the automatic original feeding / discharging device 2, and the automatic original feeding / discharging device 2 is In this state, the jammed document P must be opened and removed.

At this time, the original P is conveyed by the conveying roller 11 and the pressing roller 1 pressed against the conveying roller 11 by a leaf spring (not shown).
When the original P is pulled in the direction of the arrow in the drawing, the original P has a force to rotate the conveying roller 11 and the pressing rollers 12 and 13, and the conveying roller 11
A rotating force is also applied integrally to the rotating shaft 33 to which is attached.

However, by adopting the driving force transmitting means 30 of the present invention, it is possible to remove the jammed document A just by pulling the document A in the direction of the arrow with a small force.

That is, as described above, the movement of the transport roller 11 is
However, since the one-way clutch 32 attached to the rotary shaft 33 is in a free state with respect to the rotary shaft 33, the motion of the transport roller 11 is not transmitted from the rotary shaft 33 by a small force. The jam original can be easily removed.

Further, it is possible to improve the operability of the jam processing of the document P without requiring a special operation. Further, since the mechanism can be arranged in a space-saving manner centering on the rotating shaft 33, it becomes possible to make the device compact, and most parts can be made of resin, so that the cost can be reduced.

It should be noted that, in the above-described embodiment, the case where the sheet conveying apparatus of the present invention is applied to the original taking-in conveying means of the automatic original supplying / discharging apparatus mounted on the copying machine and the original is conveyed has been described. The present invention is not limited to this, and may be applied to those that convey sheets other than originals.

In addition, it goes without saying that the present invention can be variously modified and implemented without departing from the spirit of the present invention.

[Effects of the Invention] As described above, the sheet conveying device of the present invention is
A drive source that generates a driving force, a conveyance roller that conveys a sheet in a predetermined direction, a rotation shaft that is attached to the conveyance roller and rotates together with the conveyance roller, and a drive that is generated by the drive source on the conveyance roller. Driving force transmitting means for transmitting force, a spring clutch mechanism provided on the drive input side of the driving force transmitting means and coaxially with the rotating shaft, and an output end of the spring clutch mechanism, A first one-way clutch provided coaxially with the shaft, and an on / off control means for controlling the on / off of the spring clutch mechanism.
The intermittent control means of the sheet conveying device includes a first gear integrally formed on the outside of the spring clutch mechanism, a fixed shaft arranged in parallel with the rotation shaft, and the first shaft provided on the fixed shaft. A second one-way clutch different from the first one-way clutch, and a second gear that is integrally formed outside the second one-way clutch and that always meshes with the first gear. The rotation axis of the transport roller connected to the drive source via the spring clutch and the first one-way clutch is
By the control of the intermittent control means, at the time of document conveyance, in the predetermined direction controlled via the second gear of the second one-way clutch meshed with the gear of the outer periphery of the first one-way clutch and the spring clutch. On the other hand, when the original is jammed, the spring clutch is released so that the original can be rotated in any direction. That is, when the driving force from the drive source is supplied to the rotation shaft, only rotation in one direction (drive input in one direction) is possible, and rotation in any direction is possible from the output side of the drive source. Can be given. As a result, even when a document jam occurs, the document can be jammed without requiring a special operation, and the operability is improved. Further, since the sheet conveying apparatus of the present invention can be arranged in a small space around the rotation axis of the conveying roller, the compact sheet conveying apparatus can be provided.

[Brief description of drawings]

FIG. 1 is an external perspective view of a copying machine equipped with an automatic document feeding / discharging device to which the sheet conveying device of the present invention is applied, and FIG. 2 is a perspective view showing a state in which the automatic document feeding / discharging device is also opened,
FIG. 3 is a plan view of the automatic original feeding / discharging device with the upper cover removed, FIG. 4 is a perspective view showing the periphery of the drive source arrangement portion of the driving force transmission system, and FIG. 5 is the automatic original feeding / discharging device. FIG. 6 is a schematic sectional view, FIG. 6 is a perspective view showing a driving force transmitting means which is an essential part of the present invention, and FIG. 7 is an exploded perspective view showing the same.
FIG. 9 is an explanatory view for explaining an operation state at the time of feeding and conveying an original, FIG. 9 is an explanatory view for explaining an operation state at a restart (orienting operation) of an original, FIGS. 10A and 10 FIGS. 11A and 11B are explanatory views for explaining the operation state when the original is pulled out to the paper feed side when the original is jammed.
FIGS. 3A and 3B are explanatory views each illustrating an operation state when the document is pulled out to the discharge side when the document is jammed. P ... Original (sheet), 7 ... Original take-in / conveying means (sheet conveying device), 11 ... conveying roller, 30 ... driving force transmitting means, 31 ... spring clutch mechanism, 32 ... one-way clutch, 33 …… Rotary shaft, 34 …… Intermittent control means, 35 …… Sleeve, 35a …… Gear part, 36 …… Fixed shaft, 37 …… One-way clutch, 38 …… Gear.

Claims (2)

[Claims] 1. A drive source for generating a driving force, a transport roller for transporting a sheet in a predetermined direction, a rotary shaft attached with the transport roller and rotating with the transport roller, and the drive source for the transport roller. Driving force transmitting means for transmitting a driving force generated from the spring, a spring clutch mechanism provided on the drive input side of the driving force transmitting means and coaxial with the rotating shaft, and an output end of the spring clutch mechanism. A sheet conveying apparatus comprising: a first one-way clutch that is connected to the rotary shaft and is provided coaxially with the rotating shaft; and an on / off control unit that controls on / off of the spring clutch mechanism. 2. The on / off control means is provided on the fixed shaft, a first gear integrally formed on the outside of the spring clutch mechanism, a fixed shaft arranged in parallel with the rotating shaft. A second one-way clutch different from the first one-way clutch, and integrally formed outside the second one-way clutch,
The sheet conveying device according to claim 1, further comprising: a second gear that constantly meshes with the first gear.