JP3025915B2 - Paper feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeder for automatically conveying paper such as a document.

[0002]

2. Description of the Related Art FIG. 20 shows a conventional automatic document feeder (ADF).
FIG. 21 is a plan view showing a main part of the ADF shown in FIG.

In FIG. 1, reference numeral 1 denotes a feed roller, 2 denotes a separation roller which is in contact with the feed roller 1, 3 denotes a pickup roller which is vertically movable with respect to a set portion of a document D on a guide plate 4, 5 Is a feed roller shaft having a feed roller 1 fixed at one end together with a feed gear 6 and a driven gear 7 fixed together with an electromagnetic clutch 8 at its other end. The drive gear 10 is rotatably provided at one end thereof on the feed roller shaft 5 and supports a connecting gear 12 which meshes with the feed gear 6 and the pickup gear 11 of the pickup roller 3. It is.

A shutter 13 is driven up and down by a lever 15 provided on the feed roller shaft 5 via a torque limiter 14 to prevent the original D from protruding in the direction of the feed roller 1 when descending. Reference numeral 5 denotes a pickup torque limiter provided at 5, reference numeral 17 denotes a pressing plate for pressing down the document D, and reference numeral 18 denotes a spring for urging the pickup roller 3 away from the guide plate 4.

In the apparatus having the above-described configuration, at the time of paper feeding, the electromagnetic clutch 8 is turned on, and the rotational driving force is transmitted from the driving gear 9 to the feed roller shaft 5 via the driven gear 7, and in FIG. The pickup roller 3 presses the lower surface of the document D by the counterclockwise rotation of
While receiving the action of the torque limiter 16 for pickup, it rises to the guide plate 4 against the force of the spring 18,
Further, the feed gear 6, the connecting gear 12, and the pickup gear
The motor rotates counterclockwise due to transmission of the driving force to the motor.

The shutter 13 is raised by the lever 15 which has received the rotation of the feed roller shaft 5 to enable the document D to be sent out.

[0007] By the rotation of the pickup roller 3,
The document D is sent between the feed roller 1 and the separation roller 2, and is sent one by one downstream in the conveyance direction by the known separation and conveyance operation of the two rollers 1 and 2.

When the feeding is completed and the electromagnetic clutch 8 is turned off, the feed roller shaft 5 becomes idle and the torque limiter 16 for pickup has a configuration in which the rotation direction is the lock direction. Due to the pulling force of 18, the feed roller shaft 5, the swing bracket 10, the pickup roller 3, and the torque limiter 16 rotate in the reverse direction in a descending direction, and the pickup roller 3 returns to the standby position in the direction away from the guide plate 4.

The shutter 13 descends to the guide plate 4 when the rotation of the feed roller shaft 5 stops, and returns to a position where the next document D to be set can be prevented from being excessively fed in the feed roller direction.

The above operation is repeated at the start and end of sheet feeding.

[0011]

In the above-mentioned conventional apparatus,
The electromagnetic clutch 8 is used, and the on / off operation of the electromagnetic clutch 8 raises the pressure of the pickup roller 3 and lowers it for releasing the pressure, and the shutter 13 moves up and down. Therefore, the cost was increased by installing the electromagnetic clutch 8.

It is conceivable to remove the electromagnetic clutch 8 from the apparatus shown in FIGS. 20 and 21. However, if the electromagnetic clutch 8 is simply removed, the following various problems occur.

That is, at the time of paper feeding, the feed roller 1 continues to rotate from the first document to the last document,
Further, the pickup roller 3 also rotates and pressurizes. In this case, as shown in FIG. 22, after the trailing edge of the preceding page document D _F has passed the pickup roller 3, since the pickup roller 3 starts sending the page document D _B after the next, previous page document D _F
When the rear end of the document passes through the feed roller 1, the rear page document D
The tip of _B is sent downstream from the contact point between the separation roller 2 and the feed roller 1 in the transport direction, and when this is repeated,
Eventually, double feeding of originals occurs.

Further, the fact that the electromagnetic clutch 8 is not used means that the feed roller shaft 5 is directly connected to the drive transmission from a rotary drive source such as a motor, and the press roller 3 is pressurized by the action of the torque limiter 16. , The pickup roller 3 is rotated by the rotation of the feed roller shaft 5.
Although the document ascent is raised to the document pressing position 20, the feed roller shaft 5 does not run idle even if the document is to be lowered.

In the above-mentioned conventional device, the shutter 13 is
Before the pickup roller 3 reaches the document transport position above the guide plate 4, it must reach a predetermined ascending position and be in a state in which paper can be passed, and the accuracy of the contact point between the lever 15 and the shutter 13 Also, the accuracy of the rising timing is required.

If the shutter 13 does not reach the raised position when the pickup roller 3 reaches the document transport position, a document jam occurs, which is a problem.

An object of the present invention is to provide a sheet feeding device capable of reliably feeding a sheet without using an electromagnetic clutch and reducing the cost.

[0018]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a feed roller for separating and conveying a sheet in contact with a separation roller, and for feeding a sheet between the separation roller and the feed roller. Pickup roller and when not feeding paper
To prevent the paper from rushing in the direction of the feed roller.
In the sheet feeding apparatus having a Yatta, the feed roller is provided, and a feed roller shaft drive transmission from the rotational drive source is directly coupled, the driving force from the feed roller shaft, a pickup roller having a one-way clutch a driving means for vertically moving for a given within the rotation range in transmitting the driving force intermittent transmitting unit, feedable position the pickup roller by reverse rotation of said rotary drive source, the rotary drive
With the forward and reverse rotation of the power source,
Torque to move the shutter up and down by interlocking with the shutter
And a shutter lever provided with a limiter .

Further, according to the present invention , the paper is separated in contact with the separation roller.
Feed rollers for separating and conveying, and separation rollers and feed
Pickup roller for feeding paper between rollers
Intrusion of paper in the direction of the feed roller during paper feeding
A sheet feeding device having a shutter for preventing
A feed roller is provided and the drive transmission from the rotary drive
Roller shaft that is directly connected to
Drive force from a pickup with a one-way clutch.
Driving force intermittently transmitted to the roller within the specified rotation range
And the pick-up by forward and reverse rotation of the rotary drive source.
Driving means for moving the Pukoro up and down with respect to the feedable position
And a part of the shutter, and the rotation drive source
The pickup roller moves up and down
And a shutter gear for moving the shutter up and down in conjunction with the shutter gear .

Further, according to the present invention , the paper is separated by contacting the separation roller.
Feed rollers for separating and conveying, and separation rollers and feed
Pickup roller for feeding paper between rollers
Intrusion of paper in the direction of the feed roller during paper feeding
A sheet feeding device having a shutter for preventing
A feed roller is provided and the drive transmission from the rotary drive
Roller shaft that is directly connected to
Drive force from a pickup with a one-way clutch.
Driving force intermittently transmitted to the roller within the specified rotation range
And the pick-up by forward and reverse rotation of the rotary drive source.
Driving means for moving the Pukoro up and down with respect to the feedable position
Contacting the high friction member provided in the shutter, and
The pickup is rotated by forward and reverse rotation of the rotary drive
B. Poor for moving the shutter up and down in conjunction with
And a rebody .

[0021]

[0022]

[0023]

According to the above-mentioned means, even if the drive transmission from the rotary drive source is directly connected to the feed roller shaft, the pickup roller moves up and down with respect to the paper feedable position by the forward / reverse rotation of the rotary drive source. Transmission of rotational force from the feed roller shaft
The driving force is intermittently transmitted by the driving force intermittent transmission means in an arbitrary rotation range and at an arbitrary timing.Even without providing an electromagnetic clutch, pressurization and depressurization at the sheet feedable position in the pickup roller, and rotation and The rotation stops reliably.

Further, the timing can be set so that the sheet is fed by the pickup roller after the shutter has been raised to the top dead center position, so that the sheet can be fed reliably.

Further, the shutter can be moved up and down reliably with the operation of the pickup roller by the rotation of the pulley body via the shutter lever, the shutter gear and the high friction member.

[0026]

Embodiments of the present invention will be described below with reference to the drawings. Members corresponding to those described in FIGS. 20 and 21 are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 is a structural view showing a front part of an ADF according to a first embodiment of the present invention, and FIG. 2 is a plan view showing a main part of the embodiment of FIG. Is not provided, and the drive transmission from a rotary drive source 20 such as a motor is directly connected via the driven gear 7 and the drive gear 9. The pickup roller 3 has a built-in one-way clutch, and an end face on the side of the pickup gear 11 side.
An arc-shaped projection 21 is provided in which 21a and 21b form an interval at an angle θ. A drive pin 22 inserted between the end faces 21a and 21b is provided on a side portion of the pickup gear 11.

The feed gear 6 provided on the feed roller shaft 5 has a built-in one-way clutch, and transmits a rotational force to a pickup gear 11 via a connection gear 12.

The driving force intermittent transmission means 23 composed of the projections 21 and the driving pins 22 is provided with a contact between the feed roller 1 and the separation roller 2 after the rear end of the previous page document has passed the pickup roller 3. That is, it is set so as to operate so that the pickup roller 3 is not rotated until it passes through the separating position.

The pickup roller 3 and the shutter 13 are
As will be described later, the motor 20 is raised by the forward rotation force (clockwise rotation in FIG. 1) of the motor 20 transmitted to the feed roller shaft 5, and is lowered by the reverse rotation force (counterclockwise rotation in FIG. 1) of the motor 20. Configuration.

Incidentally, reference numerals 24 and 25 in the figure denote transport roller pairs for transporting the document D.

Next, the operation of the above embodiment will be described with reference to FIGS.

As shown in FIG. 3, before the paper is fed, the pickup roller 3, the shutter 13 and the drive pin 22 are at predetermined standby positions, and even if the original D is set on the guide plate 4, the shutter 13
This prevents overfeeding between the feed roller 1 and the separation roller 2.

Next, when a paper feed start signal is output, the motor
When the feed roller 20 rotates forward and the feed roller shaft 5 rotates, the swing bracket 10 serving as a driving means rotates, and the pickup roller 3 comes into contact with the lower surface of the document D as shown in FIG. This contact causes the torque limiter 16 for pickup to run idle, so that the pickup roller 3 is maintained in a pressurized state.

The rotation of the feed roller shaft 5 rotates the feed gear 6, the connecting gear 12, and the pickup gear 11, but the drive pin 22 of the pickup gear 11 does not reach one end face (drive face) 21a of the projection 21. Therefore, the pickup roller 3 does not rotate, and the document D is not sent out yet. The shutter 13 is raised by the rotation lever 15 of the feed roller shaft 5, but has not reached the top dead center.

As shown in FIG. 5, when the shutter 13 reaches the top dead center, the drive pin 22 of the pickup gear 11
The projection 21 is rotated clockwise in contact with the driving surface 21a of the first motor. The rotation of the projection 21 causes the pickup roller 3 to start rotating, and starts to convey the document D at a feed linear speed (conveyance speed by rotational driving of the pickup roller 3 and the feed roller 1).

As shown in FIG. 6, when the leading edge of the document D enters the space between the transport roller pair 24, the linear velocity of the document D becomes
To the linear velocity (R1). Where the linear velocity R
By setting 1 to be faster, the feed roller 1 and the pickup roller 3 are in a pressurized state, and are pulled by the document D due to the action of the one-way clutch, and rotate with the linear velocity R1. .

Accordingly, when the idling torque of the one-way clutch of the pickup roller 3 is set so that the idling torque between the pickup roller 3 and the projection 21 is greater than the idling torque between the projection 21 and the pickup gear 11, the projection 21 Since the linear speed R1 is rotated by the roller 3, the driving pin 22 of the pickup gear 11 is driven by the driving surface 21a of the projection 21.
From the other end surface (idling surface) 21b of the projection 21,
It proceeds at the speed of the relative speed between the linear speed R1 and the feed linear speed.

In the state shown in FIG. 7, the drive pin 22 abuts on the idling surface 21b of the projection 21, and the one-way clutch of the pickup roller 3 operates here, and the idling state is established.

Next, in the state shown in FIG. 8, at the moment when the rear end of the first original D passes the pickup roller 3, the pickup roller 3 is no longer in the state of being rotated by the original D conveyed at the linear velocity R1. As a result, the drive pin 22 is
The rotation is stopped until the motor moves to the drive surface 21a at the rotation speed of the feed linear speed.

As shown in FIG. 9, after the rear end of the first document D has passed through the contact point between the feed roller 1 and the separation roller 2, the drive pin 22 comes into contact with the drive surface 21a of the projection 21 so that the end face 21a ,
After the rear end of the first document D has passed through the contact point between the feed roller 1 and the separation roller 2 by setting the gap angle θ between 21b, the pickup roller 3 starts rotating, and Start sending the manuscript.

The state shown in FIG. 9 is the same as the state shown in FIG. 5, and the above-described operations shown in FIGS. 5 to 9 are repeated from the second document to the last document.

FIG. 10 shows a state in which the last document has passed the pickup roller 3. The drive pin 22 moves from the idling surface 21b of the projection 21 to the drive surface 21a and abuts thereon. The motor 20 is stopped at the time when the sheet rotates at the feed linear speed and the trailing end of the last document passes through the pair of transport rollers 24 and is discharged.

Here, the pickup roller 3 and the shutter 13
Since the lock direction is provided by operating the torque limiters 14 and 16 during operation, the motor 20 is at the above-mentioned raised position even when the motor 20 is stopped. Therefore, Pick Appicoro 3
In order to return the shutter 13 and the drive pin 22 to the standby position, the motor 20 is reversely rotated by the number of steps necessary for the shutter 13 to contact the upper surface of the guide plate 4. Due to this reverse rotation, the torque limiters 14 and 16 rotate in the locking direction.
Will be in a standby state.

As described above, as shown in FIG. 11, the shutter 13 is returned to the standby position by rotating the motor 20 in the reverse direction from the position of the top dead center where the pickup roller 3 has conveyed the last document. During conveyance, even if the pickup roller 3 rises to the bottom of the document D as shown in FIG.
The shutter 13 rotates only after the shutter 13 rises to the top dead center without rotating.

Since the torque limiter 14 and the lever 15 are raised and lowered by the forward and reverse rotations of the motor 20, the torque limiter 14 and the lever 15 are directly connected to the motor 20 without being provided on the feed roller shaft 5 as in the above embodiment. Any rotary shaft that can be driven and rotated can be installed. For example, it may be installed on a rotating shaft that supports the conveying roller pairs 24 and 25.

Further, as the driving force intermittent transmission means 23, the driving pin 22 having the above configuration may be provided on the pickup roller 3, and the projection 21 having the above configuration may be provided on the pickup gear 11.

According to the above-described embodiment, the projection 21 in the driving force intermittent transmission means 23 can be used without using a conventional electromagnetic clutch and position sensor for performing the pickup operation.
By setting the gap angle θ between the end faces 21a and 21b, the rotation range of the pickup roller is determined, the timing of the pickup can be freely set, and the cost can be reduced.

Since the pickup roller 3 rotates so as to start conveyance after the shutter 13 has been raised to the top dead center position, the accuracy of the timing of raising the shutter and the lever 15 for operating the shutter 13 are different from those of the prior art. It is not necessary to pay attention to the accuracy of the document, and the document can be transported more reliably.

FIG. 12 is a block diagram of a second embodiment of the present invention.
FIG. 14 is a perspective view of FIG. 12, and FIG. 14 is a perspective view of the drive unit of the shutter, in which a pickup roller 3 and a pickup gear 11 are pivotally supported by a swing bracket 10 so as to clamp a one-way clutch 30. Feed roller 1 and feed gear 6
Are supported so as to clamp the one-way clutch 31, and a connecting gear 12 meshing with the pickup gear 11 and the feed gear 6 is also supported.

A first gear 33a fixed to one end of a support shaft 32 meshes with the feed gear 6. Further, the second gear 33b fixed to the other end of the support shaft 32 has, as shown in FIG.
The drive gear 9 receives the rotational force of the motor 20 via a timing belt 35 provided on a pulley 34. Further, a shutter lever is attached to the support shaft 32 via the torque limiter 14.
A shutter 36 is provided, and abuts a part of the hanging leg 13a of the shutter 13 rotatably supported on the shaft 37.

As shown in the enlarged view of FIG. 15, a torque limiter 16 is provided on the feed roller shaft 5, which is the center of rotation of the swing bracket 10 and protrudes from the side of the swing bracket 10. The pin 16a at the end of the torque limiter 16 is provided on the side wall of the swing bracket 10,
The driving force intermittent transmission means is disposed between the end faces 38a and 38b of the arc-shaped projection 38 in which the end faces 38a and 38b are spaced at an angle θ.
23.

Next, the operation of the second embodiment will be described with reference to FIG.
This will be described with reference to FIG.

FIG. 16 (a) shows a standby state, in which the swing bracket 10 is lowered so that the pickup roller 3 is positioned below the lower guide plate 4, and the shutter 13
The front side portion 13b is in contact with the upper receiving portion 4a of the lower guide plate 4 to prevent the original from being pushed or sent too much.

Here, at the time of paper feeding, the motor 20 rotates, and the rotational force is generated by the pulley 34, the belt 35, the driving gear 9, and the second gear 33.
b, to the first gear 33a and the feed gear 6. Even if the torque is transmitted to the feed gear 6 and the feed roller shaft 5 rotates, the swing bracket 10 does not rise because the pin portion 16a of the torque limiter 16 does not yet contact the end face 38b. However, the shutter lever 36, which receives the driving force via the torque limiter 14 by the rotation of the second gear 33b, rotates counterclockwise. It is rotated clockwise about the shaft 37.

The swing bracket 10 rises later than the shutter 13 as the pin portion 16a comes into contact with the end face 38b. That is, as shown in FIG. 16B, the shutter lever 36 stops at a position where the shutter lever 36 rotates by the angle A °, and the swing bracket 10
By rotating to the maximum angle B ° (A ° ≫B °), the pickup roller 3 is made to protrude from the lower guide plate 4 and the pressure plate
17 to allow a known transport operation.

When the last sheet of the original is discharged, the motor 20 rotates in the reverse direction to return the shutter 13 to the state shown in FIG. 16 (a). When the rotation of 36 is reversed by the angle A °, the swing bracket 10
Since there is a gap between the end face 38a of the projection 38 and the pin portion 16a of the torque limiter 16, a gap is secured by θ = (A ° −B °).

Because of the existence of the gap angle θ, the pickup roller 3 of the swing bracket 10 hits the document with a delay with respect to the rise of the shutter 13, thereby solving a problem such as a paper jam.

FIG. 17 is a structural view showing another example of the rotating mechanism of the shutter 13. In this example, the hanging feet 13a of the shutter 13 are shown.
The shutter 13 is moved up and down by the rotation of a shutter gear 41 composed of an involute gear meshing with the gear portion 40, so that the transmission loss of the driving force is small, and the operation is performed efficiently and reliably. Will be done.

FIG. 18 is a structural view showing another example of the rotating mechanism of the shutter 13, and FIG. 19 is an enlarged sectional view of a main part of FIG. 18. In this example, the hanging feet 13a of the shutter 13 are made of rubber or the like. High friction member 4
When the pulley 44 having the V-shaped groove 43 in contact with the high friction member 42 is rotated, the shutter 13 is moved up and down by frictional transmission of the driving force. Depending on the specification, the high friction member 42 may be provided on the V-shaped groove 43 side.
By transmitting the driving force by friction, there is no need to increase the member accuracy and the position accuracy, and the manufacturing cost can be reduced.

[0061]

As described above, according to the present invention,
The pickup roller moves up and down due to the forward and reverse rotation of the rotary drive source, and further rotates at an appropriate timing by the driving force intermittent transmission means, so that the pickup operation is reliably performed without using an electromagnetic clutch, and further, a shutter lever, By moving the shutter up and down by a shutter gear or pulley body, the operation timing of the shutter for stopping and releasing the sheet feeding and the operation timing of the pickup roller can be set appropriately, and the sheet feeding is reliably performed without using the electromagnetic clutch. In addition, it is possible to provide a sheet feeding device capable of reducing costs.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a front part of a first embodiment of a sheet feeding device of the present invention.

FIG. 2 is a plan view showing a main part of the embodiment of FIG.

FIG. 3 is an explanatory diagram of the operation of the embodiment in FIG. 1;

FIG. 4 is an explanatory diagram of the operation of the embodiment of FIG. 1;

FIG. 5 is an explanatory diagram of the operation of the embodiment of FIG. 1;

FIG. 6 is an explanatory diagram of the operation of the embodiment of FIG. 1;

FIG. 7 is an explanatory diagram of the operation of the embodiment in FIG. 1;

FIG. 8 is an explanatory diagram of the operation of the embodiment of FIG. 1;

FIG. 9 is an explanatory diagram of the operation of the embodiment in FIG. 1;

FIG. 10 is an explanatory diagram of the operation of the embodiment in FIG. 1;

FIG. 11 is an explanatory diagram of the operation of the embodiment in FIG. 1;

FIG. 12 is a configuration diagram of a second embodiment of the present invention.

13 is a configuration diagram of a shutter driving unit of the embodiment in FIG.

FIG. 14 is a perspective view of the embodiment of FIG.

FIG. 15 is an enlarged view of a torque limiter part of FIG.

FIG. 16 is an explanatory diagram showing an operation state of the embodiment in FIG. 12;

FIG. 17 is a configuration diagram illustrating another example of a shutter rotation mechanism.

FIG. 18 is a configuration diagram illustrating another example of a shutter rotation mechanism.

19 is an enlarged sectional view of a main part of FIG.

FIG. 20 is a configuration diagram showing a front part of a conventional ADF.

FIG. 21 is a plan view showing a main part of the ADF in FIG. 12;

FIG. 22 is an explanatory diagram illustrating one state of document conveyance.

[Explanation of symbols]

1: feed roller, 2: separation roller, 3: pickup roller, 5: feed roller shaft, 10: swing bracket
(Drive means), 13 ... shutter, 14, 16 ... torque limiter, 15 ... lever, 20 ... motor (rotary drive source), 16,
21, 22, 23, 38: intermittent driving force transmission means, 30: one-way clutch, 36: shutter lever, 41: shutter gear, 42: high friction member, 44: pulley body.

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B65H 1/00-3/68

Claims (3)

(57) [Claims] And 1. A feed roller for separating conveying the sheet in contact with the separation roller, a pickup roller for feeding a sheet to the separation roller and the feed roller, put at the non-paper feed
To prevent the paper from rushing in the direction of the feed roller.
In the sheet feeding apparatus having a Yatta, the feed roller is provided, and a feed roller shaft drive transmission from the rotational drive source is directly coupled, the driving force from the feed roller shaft, a pickup roller having a one-way clutch a driving means for vertically moving for a given within the rotation range in transmitting the driving force intermittent transmitting unit, feedable position the pickup roller by reverse rotation of said rotary drive source, the rotary drive
With the forward and reverse rotation of the power source,
Torque to move the shutter up and down by interlocking with the shutter
And a shutter lever provided with a limiter . 2. A method for separating and conveying a sheet in contact with a separation roller.
Paper between the feed roller and the separation roller and the feed roller
Pickup roller for feeding paper, and
To prevent the paper from rushing in the direction of the feed roller.
A feeder provided with a feed roller.
Is provided, and the drive transmission from the rotary drive source is directly connected.
Feed roller shaft and the driving force from this feed roller shaft
To the pickup roller with one-way clutch
A driving force intermittent transmission means for transmitting power within a constant rotation range;
The pickup roller is fed by forward / reverse rotation of the rotation drive source
Driving means for moving up and down with respect to a possible position;
And the rotation drive source rotates forward and backward.
And interlocks with the vertical movement of the pickup roller.
Sheet feeding device characterized in that a Shattagiya for vertically moving the shutter. 3. A method for separating and conveying a sheet in contact with a separation roller.
Paper between the feed roller and the separation roller and the feed roller
Pickup roller for feeding paper, and
To prevent the paper from rushing in the direction of the feed roller.
A feeder provided with a feed roller.
Is provided, and the drive transmission from the rotary drive source is directly connected.
Feed roller shaft and the driving force from this feed roller shaft
To the pickup roller with one-way clutch
A driving force intermittent transmission means for transmitting power within a constant rotation range;
The pickup roller is fed by forward / reverse rotation of the rotation drive source
Driving means for moving up and down with respect to a possible position;
Contact the high friction member provided on the
It rotates by reverse rotation and moves up and down with the pickup roller.
Moving to the sheet feeding device you characterized in that a pulley member for vertically moving the shutter.