JPS6097134A - Sheet-member feeding apparatus - Google Patents

Abstract

PURPOSE:To simplify structure by utilizing the power system of a machine side as the driving source of an elevation mechanism and driving-controlling said mechanism according to the height of a loaded sheet, in the captioned apparatus equipped with a sheet loading base raised by the elevation mechanism. CONSTITUTION:A clutch pulley 33 to which the turning moment of a pulley which is always in revolution state in the revolution-driving system such as the photosensitive body of a copying machine, etc. is transmitted through a belt 35 is installed onto the edge part of the driving shaft axially supported onto the apparatus body side. The revolution of the pulley 33 is transmitted to a pulley 51 through a gear 39, spring clutch, pulley, and a belt 52, and the driving sprocket 9 of an elevation mechanism fixed onto the shaft 50 of the pulley 51 is revolved, and a sheet loading base 1 is raised through a chain 14. The spring clutch is put into cut-off state when the height of rise of the loaded sheet P reaches a prescribed position, and a hook lever 44 is engaged with the spring clutch through the feeding roller which contacts with the upper surface of the sheet P and a lever.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet member feeding device for feeding sheet members such as copy paper or printing paper one by one to a copy processing unit or printing unit in, for example, a copying machine or a printing machine. Regarding.

More specifically, it is equipped with a sheet feeding device with a sheet loading table that moves up and down, that is, a sheet loading table whose upward and downward movements are controlled by a lifting mechanism, and the sheets set on the table are moved upward and downward by a feeding means. Separate and feed one sheet at a time,
As sheet separation and feeding progresses (sheet consumption), the table is automatically moved upward each time the two-face position level of the stacked sheets on the table falls to a predetermined permissible lower limit. Especially for the feeding means on the north side of the stacked sheet on the table.
The present invention relates to an apparatus that feeds sheets by constantly maintaining the two-face position level within a predetermined substantially constant level range that ensures stable feeding of 11 sheets.

This type of sheet feeding device is different from other sheet feeding devices, such as sheet cassette insertion type sheet feeding devices, and the sheet loading platform is fixed in a fixed position to cope with a decrease in the position level of the stacked sheet 1 side due to sequential consumption of sheets. For example, compared to a sheet feeding device that moves the sheet feeding means downward,
Because it is possible to load and set a large number of sheets (2,000 sheets, etc.) on the sheet loading table at once and feed those sheets continuously until the last sheet, high-speed high-quality copying is possible. As a large-capacity sheet feeding mechanism (multi-sheet deck mechanism) built into a machine or printing machine, or for example, for copying using a general sheet cassette insertion method that does not have such a large-capacity sheet feeding mechanism built-in. It is used as a unit-type, large-capacity sheet feeding device that can be optionally connected to a machine.

By the way, a conventional sheet feeding device of this kind with a two-lower power type includes a sheet loading platform as a sheet storage section, and a sheet loading platform elevating mechanism including a dedicated drive source, such as a forward/reverse motor. A feeding means that separates and feeds five stacked sheets one by one in order from the top, detects the position level of two sides of the stacked sheets. A level sensor consisting of a lever member and a photoelectric sensor, etc., and a locking mechanism that prevents the sheet loading platform from naturally descending due to its own weight (for example, a worm and a worm gear are interposed in the power transmission system of the sheet loading platform elevating mechanism. The motor, which is the drive source, is linked with the surface level sensor, locking mechanism (electromagnetic), etc., and forward rotation (ascending motion of the platform) and reverse rotation (ascent of the platform) are performed. It was equipped with an electric control circuit for controlling the lowering motion, and had a fairly complex structure as a whole, combining various mechanical and electrical mechanism means.

The present invention is also a sheet feeding device using a two-down movement system for a sheet stacking platform, but the driving source for the sheet stacking platform elevating mechanism is a power system on the side of the machine, such as a copying machine or a printing machine.

For example, in a copying machine, it is possible to utilize the power of a rotational drive system such as a photoreceptor, and therefore, it is possible to eliminate the need for a drive source such as a dedicated forward/reverse motor on the sheet feeding device side. A simple M system that organically interconnects the means for detecting the upper surface position of the stacked sheets on the table, the locking means for preventing natural downward movement of the sheet loading table due to its own weight, and the means for controlling the upward and downward movement of the sheet loading table. ! The purpose is to provide a mechanical mechanism that has a simple overall configuration, is highly reliable, and is practical.

A detailed explanation will be given below based on an embodiment shown in the figure.

The sheet feeding device of this example is built into a copying machine as a multi-sheet deck mechanism, and Figures 1 to 4 are a vertical right side view, a top view, a right side view, and a top view of the sheet feeding device portion, respectively. On the left side, FIG. 5 is a perspective view of the sheet loading platform and the left and right sheet regulating plates, FIG. 6 is a perspective view of the power transmission mechanism, and FIG. 7 is an enlarged partially cutaway plan view of the same portion.

In the figure, A is an exterior casing of the copying machine, which houses a copying process mechanism, but is omitted from the figure.

Reference numeral 1 designates a sheet loading platform, and four guide rollers 4.4 and 4 are attached to the outer surfaces of the left and right downwardly bent side plates 2 and 3, respectively, in pairs on the upper and lower sides. 6
It is engaged with a rail groove 7φ8 formed in the vertical direction on the surface of the device chassis, and is arranged horizontally between the left side plate 5 and the right side plate 6, and is freely movable up and down along the rail grooves 7 and 8. It is.

9φ10.11 and 12 are sprockets pivotally mounted on the outer surfaces of the left side plate 5 and right side plate 6 of the apparatus chassis, respectively, and on the upper and lower end sides of the respective rail grooves 7 and 8. The sprockets IO and 12 on the lower end side of the rail groove 798 are fixed to the left and right ends of a common horizontal shaft 13 rotatably supported by bearings between the left side plate 5 and the right side plate 6 of the device chassis. Reference numerals 14 and 15 indicate chains suspended between sprockets 9 and 10 and between sprockets 11 and 12, respectively, and these chains are connected to guide rollers 4, 4, 4, and 4 on the left and right sides of the sheet loading platform 1, respectively. It is connected to the support shaft. As will be described later, when the sprocket 9 is driven in the normal direction via the clutch 59, each of the left and right sprockets and the chain 14-1
5 rotates forward a and see! - The loading platform 1 is driven upward.

When the clutch 59 is disengaged, the sprocket 9 becomes freely rotating, and each sprocket on the left and right side and the chain 14.
15 is the sheet loading table L (and the sheet P loaded on it)
Due to its own weight, the sheet loading platform 1 rotates in the opposite direction and moves downward. In this example, as will be described later, in conjunction with the opening/closing operation of the box-shaped opening/closing door 62 of the sheet feeding device section, when the door is closed, the clutch 59 is connected and the upward movement of the sheet loading platform 1 is started. When the door is opened, the clutch is disengaged and the platform 1 is moved downward to the lowest position.

Reference numerals 16 and 17 denote transparent holes whose lower ends are supported by the apparatus chassis bottom plate 18 (FIG. 1) at inner positions of the left side plate 5 and the right side plate 6 of the apparatus chassis, and which are formed on the left and right sides of the sheet loading table 1. These are a pair of left and right stacked sheet double side regulating plates that are erected through holes 19 and 20 (FIG. 2). The seat 1-P is loaded and set on the stand l-L between the left and right regulating plates 16 and 17 with the front end side in contact with the inner surface of the apparatus chassis front plate 21. In order to be able to adjust the distance between the left and right regulating plates 16 and 17 according to the size of the sheet P used, the right regulating plate 17 is used as a fixed reference side plate, and the left regulating plate 16 is used as the device chassis bottom plate. 18 is attached without a movable plate whose position can be changed freely, but the position changing mechanism is omitted from the figure.

Reference numerals 22 and 22 designate single-sheet separating claws which are attached to the top ends of the left and right regulating plates 16 and 17, respectively, so as to be able to swing vertically about a shaft pin 23 (FIG. 5). 24-25 regulates the vertical swing range of the separation claw to a predetermined angular range.
This is the second rug. In the free state, each of the separating claws 22 rotates downward around the shaft pin 23 under its own weight and is received by the lower lug 25.

Reference numeral 26 denotes a sheet feeding roller as sheet feeding means. This sheet feeding roller 26 is connected to the device chassis-left side plate 5.
The drive shaft 27 is rotatably supported by a bearing between the same right side plate 6.
A pair of arms 28 and 29 are provided on the left and right sides of the drive shaft 27, respectively, so that the shaft 27 can freely rotate while restricting movement in the axial direction.
A support shaft 30 is located between the tips of the left and right arms 28 and 29.
are rotatably supported by bearings, and a plurality (three in this example) are fixedly disposed along the longitudinal axis of the support shaft 30. In addition, a second
As shown in the figure, timing pulleys 27a and 30a are fixed to each other, and a timing belt 27b is suspended between the two pulleys 27a and 30a. Therefore, when the drive shaft 27 is driven in the normal rotation C (FIG. 6) by the drive system described later, the support shaft 30
That is, the sheet feeding roller 26 is driven to rotate normally (rotated in the sheet feeding direction).

2. The arm 28-29, which supports the supporting shaft 30 to which the sheet feeding roller 26 is fixed, always has a rotating force clockwise in FIG. 1 about the drive shaft 27 due to its own weight and the weight of the roller 26, etc. . In the free state, the lower limit of clockwise rotation is limited to the position of the arm receiving pin 31 (FIG. 6).

32 is an electromagnetic clutch that extends and projects the left end of the drive shaft 27 to the outside of the left side plate 5 of the device chassis, and is disposed on the protruding shaft portion; 33 is coupled to the drive shaft 27 when the electromagnetic clutch is energized; (clutch-on), and when de-energized, the clutch pulley is disengaged (clutch-off) and the drive shaft 27 is free to rotate. 34 is a first gear integrated with the clutch pulley. A belt 35 is suspended between the clutch pulley 33 and a regular pulley (not shown) disposed in a drive system for a copying process mechanism of a copying machine, for example, a rotation drive system for a photoreceptor or the like. Therefore, the clutch pulley 33 and the first gear 34 integrated with the clutch pulley 33 are always driven in the normal rotation both when the electromagnetic clutch 32 is in the on state and in the off state. When the electromagnetic clutch is on, the clutch pulley 33 is integrally connected to the drive shaft 27.
is driven in normal rotation C, and the sheet feeding roller 26 is driven to rotate.

37 (Fig. 7) shows a drive shaft 2 between the left side plate 5 of the device chassis and an auxiliary side plate 38 arranged in parallel with the left side plate 5 on the outside thereof.
A non-rotating shaft 39 is disposed parallel to the shaft 7 with a bearing, and a second gear 39 is loosely fitted to the shaft, and meshes with the first gear 34. This second gear 39 has a larger diameter than the first gear 34. Reference numeral 40 denotes a timing boot loosely fitted onto the shaft 37, which has a smaller diameter than the second gear 39. 41 is the second gear 39 and the timing pulley 40.
This is a known spring clutch consisting of a coil spring 42, a control ring 43, and a pawl lever 44 that engages with numerous teeth 43a formed on the outer periphery of the control ring. control ring 4
3 is rotated 1F by the engagement of the pawl lever 44, both the second gear 39 and the timing pulley 40 are loosened by the winding force of the coil spring 42 around the false hubs 39a-40a, and the gear 39 and the pulley 4o are is disconnected (clutch-off), and only the second gear 39 rotates idly on the shaft 37 by receiving the rotational force of the first gear 34 which is in normal orbit. Claw lever 44
When the control ring 43 separates and the second rotation of the chain ring is released (clutch-on), the coil spring 42 becomes tightly wound around the gear 39 and the two hubs 39a and 40a of the pulley 4o, and the pulley 40 It is integral with the second gear 39 and is freely rotatable on the shaft 37 (Fig. 1), and is always urged to rotate in the direction of engagement with the control ring 43 by the spring 46.

Reference numeral 47 (Fig. 6) is a left-right lever that can freely rotate around a shaft 48, and the right end of the lever 47 (Fig. 6) is connected to the chassis-left side plate through a long hole 49 (Fig. 4) formed in the surface of the device chassis-left side plate 5. 5
The supporting shaft 30 to which the sheet feeding roller 26 is fixed is connected to the side surface of the left arm 28 which is supported by a bearing. The left end of the lever 47 receives the tip of the arm opposite to the claw side of the claw lever 44. Therefore, the left-right lever 47 rotates around the drive shaft 27 of the arm 28 in a downward direction (clockwise rotation in FIG. 1) and in an upward direction (counterclockwise rotation).
It swings and rotates around 8.

Then, in conjunction with the rocking rotation of Shihachi-47, the pawl lever 4
4, when the arm 28 rotates in the downward direction, control Jli
43, against the spring 46, and conversely, when the arm J-28 rotates in the upward direction, the rotation is controlled in the direction of engagement with the control ring 43. . That is, the spring clutch 41 is controlled to be turned on and off in conjunction with the vertical swinging rotation of the arm 28.

Reference numeral 50 designates the rotation center axis of the drive sprocket 9 of the elevating mechanism of the sheet loading platform l, and the left side plate 5 of the apparatus chassis is parallel to the axis, similar to the support shaft 37 of the second gear 39 and the pulley 40. A non-rotating bearing is disposed between the auxiliary side plate 38 and the auxiliary side plate 38. 51 is a pulley loosely fitted to the shaft 50, and the shaft 37
The pulley has a larger diameter than the pulley 40 between them, and a belt 52 is suspended between the two pulleys 4o and 51 to transmit the rotation of the pulley 40 to the boot 951. 53 is axis 5
0 to 1) the hub firmly fixed with the second screw 531, 5
4 is a coil spring wound around this fixed hub 53 and the hub 55 on the pulley 51 side, and these members 53, 54-
55 Nyori pulley 51 is forward rotation power (Pulley 40, Bell I
・When receiving the forward rotational force due to 52), the coil spring 54
becomes the loosening direction, and the pulley 51 rotates the shaft 50 in the forward direction IL+, but when it receives a reverse rotational force, the coil spring 54 tightly wraps around the hubs 53-55, and the pulley 51 rotates in the opposite direction. One-way drive transmission spring clutch 5 that prevents rotation
6 is configured.

57 is the shaft 5 between the pulley 51 and the sprocket 9.
It is a connecting ring that can freely slide in the axial direction of the sprocket, and is connected to the pulley 51 via a coil spring 58, and is constantly urged to move in the direction of the sprocket 9 by the coil spring 58, and rotates together with the pulley 51. . The connecting ring 57 and the sprocket 9 are formed with mutually meshing teeth 57aφ9a on their opposing sides, and in a free state, the connecting ring 57 is pressed against the sprocket 9 by the coil spring 58, and the two 58 and 9 are pressed against each other. interlocking joint 8
(clutch-on).

That is, the coupling ring 57, the coil spring 58, and the sprocket 9 form a meshing clutch 59.

Reference numeral 60 denotes a tarlatch lever for moving the connecting ring 57 of the dog clutch 59 toward and away from the sprocket 9;
1 is its rotation center axis. This clutch L/ /<
-60 Box type opening/closing door 62 of sheet feeding device 6
Rotation control is performed clockwise and counterclockwise about a shaft 61 in conjunction with the opening/closing operation about the shaft 61. That is, when the debris 62 is in the closed state, the lever contact protrusion 62a on the door 62 side
is not in contact with the lever, and the clutch lever 6o is rotated counterclockwise by the tension spring 64 until it is received by the stopper pin 65, and the protrusion 60a at the tip of the lever escapes from the seat 57b of the connecting ring 57. and remain contact-free.
As a result, the coupling ring 57 is sufficiently pressed into contact with the sprocket 9 by the coil spring 58. That is, the dog clutch 59 is kept in the on state. On the other hand, when the door 62 is opened, the protrusion 62a on the door side comes into contact with the clutch lever 60 during the rotation process, and the clutch lever 60 resists the tension spring 64 and the coil spring 58 due to the subsequent rotational force of the door 62. and is rotated clockwise (as shown by the two-dot chain line in FIG. 7). Due to the clockwise rotational force of the lever 60, the seat 57b of the connecting ring 57 is pushed by the protrusion 560a on the lever 6o side, and the ring 57 is moved backward toward the pulley 51 side, so that the engagement with the sprocket 9 is released.

That is, the dog clutch 59 is kept in the off state.

The door 6 is used to load the sheets P onto the sheet loading table L or to change the size and type of the sheets being used.
When the clutch 59 is opened and operated, the dog clutch 59 is held in the OFF state as described in ``2''. By turning off the clutch 59, the sprocket 9 becomes free to rotate on the shaft 50. Its fitting sprockets 9 to 12, chain 14,
The sheet loading table lifting mechanism consisting of 15 performs a reverse rotation operation b (third
- As shown by arrow b in Figure 4, platform 1 automatically descends to the lower limit position. In this case, in order to prevent the shock caused by the rapid downward movement of the platform 1 or to reduce the descending speed to an appropriate low speed, a shock absorbing means for the platform 1 and a deceleration mechanism such as a governor are added. You can also.

As the table 1 is lowered, the upper surface of the table 1 or the two surfaces of the 6 loading sheets P on the table 1 are lowered, and the sheet feeding roller 26 is lowered.
rotates downward around the drive shaft 27 until the arm 28 is received by the receiving pin 31. Also, one sheet separation claw 22
- 22 also rotates downward around the shaft pin 23 until it is received by the lower lug 25. In conjunction with the downward rotation of the arm 28, the pawl lever 44 of the spring clutch 41 is rotated away from the control ring 43 via the left-right lever 47, and the spring clutch 41 is held in the on state. Therefore, when the spring clutch 41 is turned on, the rotational force of the first gear 37 is transferred from the second gear 39 to the spring clutch 41 in the on state to the pulley 4.
0 → is sequentially decelerated and transmitted to the pulley 51 via the bell i.52, and is transmitted to the pulley 51 and the coil spring 58 integrated therewith
- The connecting ring 57 is maintained in a state in which it is rotated in the normal direction around the shaft 50. However, as mentioned above, the positive rotational force is applied to the dog clutch 59 due to the door 62 being open.
Since the signal is in the off state, the signal is not transmitted to the sprocket 9. The electromagnetic clutch 32 is turned on by being energized by the copying machine control circuit every time paper feeding starts. At this point, the electromagnetic clutch 32 is not energized and the clutch is off, causing the drive shaft 27Φ sheet feeding roller 26 to rotate. It is not driven.

When the loading and setting of the sheets to be used on the lowered table 1''2 is completed, the door 62 is closed. This f? By closing 62, the dog clutch 59 is turned on and held. Then, the sprocket 9 immediately rotates integrally with the pulley 51, which is in the forward rotation state, via the dog clutch 59, and the lifting drive of the platform 1 starts. The lower limit level of the predetermined upper surface position level range Lh-L sentence (Fig. 1) that ensures stable single-sheet separation and feeding of the upper surface of the stacked sheets P of this table 1 by the lifting drive of this table 1. When the sheet reaches the vicinity of Ll, the upper surface of the sheet comes into contact with the lower surface of the sheet feeding roller 26,
Also, the left and right corners of the leading edge of the top surface of the sheet are provided with separation claws 22 and 22, respectively.
22.

Then, the upper surface of the sheet is lifted and rotated by the subsequent upward drive of the table 1, which moves the sheet feeding roller 26 around the drive shaft 27 against the weight of the rollers, etc., and also lifts and rotates the separation claws 22 around the shaft pin 23. Level up while doing so.

The pawl lever of the spring clutch 41 is operated via the left-right lever 47 in conjunction with the rotation of the sheet feeding roller support arm 28 in the upward direction about the shaft 30 as the level of the upper surface of the 1Fft sheet rises. 44 is sequentially rotated in the direction in which it engages with the control ring 43. Then, at a certain point after the upper surface of the loading seam P enters the predetermined level range Lh-L, the pawl lever 44 engages with the control ring 43 to prevent the control ring 43 from rotating. reach. Therefore, at this point, the spring clutch 41 is held off, thereby cutting off the transmission of rotational force to the pulley 40 and stopping the upward drive of the platform I. When the lifting drive of the table 1 is stopped, a reverse rotating force is applied to the pulley 51 from the sheet stacking table elevating mechanism side due to the gravity of the table 1 and the stacked sheets P on it. The reverse rotation is suppressed by the reverse rotation prevention force of the spring clutch 56, and the platform 1 is stably stopped and held at the final raised position, and the apparatus enters a sheet feeding standby state.

Figure 1 shows the sheet feeding standby state of this device. It is something.

In this standby state, when the electromagnetic clutch 32 is energized for a predetermined period of time in response to a sheet feeding start signal output from the copying machine control circuit, the electromagnetic clutch is held on during that time, and the drive shaft 27 is driven to rotate in the forward direction. C, and in conjunction with this, the sheet feeding roller 26 is driven to rotate normally. Due to the forward rotation of the feeding roller 26, a feeding force acts on the uppermost sheet of the stacked sheets P, and the sheet is moved to the separating claws 22, 22.
One sheet is separated from the next sheet and unwrapped forward. The fed sheet enters the sheet path between the lower sheet guide plates 80 and 81, and is then conveyed to a copying process mechanism (not shown) by an intermediate conveyance means such as a pair of registration rollers 82.

The drive of the sheet feeding roller 26 is cut off after the leading edge of the fed-out sheet reaches the relay conveyance means 82 but before the trailing edge finishes passing the roller 26 position, and becomes in a free rotation state. In this way, each time the drive shaft 27 is intermittently driven in forward rotation for a predetermined period of time by the on/off control of the electromagnetic clutch 32, the stacked sheets P on the table 1 are separated and fed one by one from the top. . As the sheets are sequentially fed, the upper surface level of the stacked sheets P gradually decreases, and accordingly, the sheet feeding roller 26 and the sheet separation claw 22Φ22 also sequentially move downward.

However, as long as the upper surface position level of the stacked sheets P is within the predetermined level range Lh-LM, the separation and feeding of each sheet continues stably. Further, as the sheet feeding roller 26 sequentially moves downward, that is, the arm 28 moves downward, the pawl arm 44 of the spring clutch 41 sequentially moves in a direction away from the control ring 43 via the left and right arms. However, while the upper surface level of the stacked sheet P is within the range Lh-Ll, it does not completely disengage from the control ring 43, and the spring clutch 41 is maintained in the OFF state.

When the surface position level of the stacked sheets P reaches the lower limit level Ll of the above range due to sequential feeding of the sheets, or when it becomes lower than that, the claw arm 44 is completely removed from the control ring 43. Become. And at this point, spring clutch 4
1 is turned on, the sprocket 9 is driven in the normal rotation S via the pulley 40 → belt 52 → pulley 51 → dog clutch 59, and the platform 1 starts to rise again. When the platform 1 rises again, the upper surface position level of the loading sheet P rises again within the predetermined level range Lh-LM, and with this rise, the spring clutch 41 is turned off and the platform 1 stops rising.

In this way, every time about 10 to 20 stacked sheets P are sent out, the above-mentioned upward movement of the platform L is intermittently and automatically executed, so that the upper surface of the stacked sheet P is always within a predetermined level range Lh-.
Even a large number of sheets, such as 1000 sheets and Φ2000 sheets, can be stably and sequentially fed one by one until the last one.

FIG. 8 shows another embodiment of a mechanism for controlling the contact and separation of the pawl lever 44 with respect to the control ring 44 of the spring clutch 41 in conjunction with the rocking of the sheet feeding roller support arm 28. Reference numeral 65 indicates a rotation center axis of the pawl lever 44, 66 indicates a first pin implanted in the side surface of the lever, and 67 indicates a fixed member (not shown) on the opposite side of the first bin 66 with the shaft 65 inside. The second pin 68 is a tension spring stretched between the two bottles 66 and 67.

The first bottle 66 installed in the lever connects the shaft 65 and the second pin 67.
When the pawl lever 44 is located on the control ring 43 side with respect to the line connecting the two, the pawl lever 44 is actively urged to rotate toward the control ring, becomes engaged with the control ring, and turns off the spring clutch 41. Hold.

Reference numeral 69 denotes a third pin embedded in the side surface of the pawl lever, and the third pin projects into an elongated hole 70 formed vertically in the side surface of the sheet feeding roller support arm 28. When the sheet feeding roller support arm 1128 rotates downward as the stacked sheets P are sequentially fed, the upper end of the elongated hole 70 comes into contact with the third bin 69 and presses it downward. That is, the pawl lever 44 is urged to rotate away from the control ring 43 against the tension spring 68. At some point, the first pin 66 connects to the shaft 65 and the second pin 6.
7 and moves to the opposite side from the control ring side, the rotation bias direction of the pawl lever 44 by the spring 68 is instantaneously switched to the direction of actively separating the lever from the control ring side, and the pawl lever 44 is moved to the opposite side from the control ring side. is in a state in which it is largely rotated in the opposite direction until it is received by the stopper pin 731. As a result, the spring clutch 41 is turned on, and the northward movement of the platform 1 is started. When the upper surface of the stacked sheets rises to within the predetermined level range Lh-Ll due to the rise of this platform L, the elongated hole 7 of the arm 28 which has been raised and rotated by 1" corresponds to the third pin 69.
The lower end of 0 comes into contact and presses it in one direction. That is, the pawl lever 44 is urged to rotate in the direction of the control ring 43 against the tension spring 68, contrary to the above. And anyway, the first bottle 6
6 again crosses the line connecting the shaft 65 and the second pin 67, the direction of the rotation biasing force of the spring 68 of the pawl lever 44 is momentarily switched to the direction of positively engaging the lever with the control ring again, and the spring The clutch 41 is held in the off state, and the upward movement of the platform I is stopped at that point. The advantage of this example is that the pawl lever can be rapidly oscillated to switch toward and away from the control ring.

FIG. 9 shows another embodiment of the means for stopping and holding the sheet stacking platform L driven upward in the raised position.
The sprocket 9 and the pulley 51 are integrated into one body 4, and a ratchet 72 is further provided. A pawl 73 is coupled to the ratchet 72, and the pawl 73 can swing around a pin 74, and a spring 75 applies a force in the engaging direction to the ratchet 72. The engagement of the pawl 73 with the ratchet 72 prevents the sheet stacking platform 1 from moving downward under its own weight from the upward movement position.

The claw 73 is rotated in the release direction by the opening operation of the door 62,
The sheet loading platform descends to the lower limit position. At this time, pulley 5
The number of teeth on the timing pulley 1 (timing pulley) and the pulley 40 (same) causes the pulley 40 to rotate at high speed, and the sheet loading platform gently descends due to the sliding load of each part.

In the above example, the rising position stopping means of the sheet stacking platform 1 is released by opening the door 62, but if the sheet stacking section is slidable and can be detached from the copying machine body, it may be removed. The release may also be performed by an action to do so.

For example, the sheet stacking section can be configured to be detachable from the second gear 39, thereby making it detachable.

Also, a linkage member 47 (44) that controls the engagement and disengagement of the clutch 41.
In the above embodiment, the supporting arm of the sheet feeding roller 26, which is the sheet feeding means, is linked to the support arm 2, but the vertically swinging member 1 other than the arm, such as the sheet separating claw 22, or the member dedicated to detecting the level of the upper surface of the stacked sheets. The clutch 41 may be controlled to be engaged or disengaged in conjunction with the above.

As described above, the present invention utilizes a drive means for driving a photoreceptor, etc. as a driving source for raising and lowering the sheet stacking table l, thereby decelerating the above-mentioned drive to a necessary speed without using a new drive means. In addition to increasing the torque and slowing down the rising speed of the sheet loading platform to prevent deterioration of sheet feeding efficiency, the system also prevents image blurring by dispersing the shock when the sheet loading platform rises in the deceleration mechanism. It becomes possible to prevent IF. The force from this decelerated drive source is transmitted to a mechanism that raises the sheet loading platform when necessary, using a spring clutch and a control ring and pawl that control it,
In addition, by directly mechanically controlling the position of the paper feed roller with this claw in contact with the top surface of the sheet, which changes depending on the height of the sheet surface, a special loaded sheet-L facing bell sensor means and control is applied. It does not require any means.

In order to prevent the sheet loading platform from descending due to its own weight and paper weight, if the sheet loading platform is lowered using a mechanism that locks onto the main body using a one-way rotation transmission means, the door associated with the sheet loading section must be closed. By using the opening/closing operation of 62 to release the transmission between the locking means and the upward drive transmission mechanism, the sheet loading platform automatically descends due to its own weight and paper weight. No means such as rotation is required.

Therefore, it is possible to mass-produce this type of sheet feeding device, which has a simple overall structure, high reliability, and is practical, at a low cost, and the intended purpose is well achieved.

[Brief explanation of drawings]

The drawings show a device according to an embodiment of the present invention. FIG. 1 is a vertical right side view, FIG. 2 is a plan view, FIG. 3 is a right side view, FIG. 4 is a left side view, and FIG. 5 is a right side view. Fig. 6 is a slope view of the sheet loading platform and sheet regulating plate portion, Fig. 6 is a slope view of the power transmission mechanism portion, Fig. 7 is a partially cutaway enlarged plan view of the same portion, Fig. 8
φ9 diagrams each showing a modified example mechanism part. 1 is a sheet loading table, 26 is a sheet feeding roller, and P is a loaded sheet. 8 Japanese Patent Application Sho GO-97134 (9)

Claims (2)

[Claims] (1) Sheet loading platform. a sheet stacking platform elevating mechanism that moves the sheet stacking platform upward in response to forward rotational driving force; and a drive that includes a mechanical clutch mechanism and transmits the normal rotational driving force from the drive source to the sheet stacking platform elevating mechanism. a force transmitting mechanism; a sheet feeding means that rides on the top surface of the stacked sheets of the sheet stacking Taipei and applies a feeding force to the topmost sheet of the stacked sheets;・A linking member for controlling disconnection, and the intermittent lifting drive of the sheet stacking platform based on the engagement and disconnection of the clutch mechanism by the linking member allows the upper surface position of the stacked sheets to be adjusted to the level regardless of the sequential feeding consumption of the stacked sheets. A sheet member feeding device characterized in that the sheet member feeding device is maintained within a predetermined level range. (2) Sheet member feeding according to claim (1), characterized in that the linking member is linked to vertical swinging of the sheet feeding means in accordance with changes in the two-face position level of the stacked sheets. Device.