JPS6027025B2 - Bottom plate pressure control device in paper feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bottom plate pressure control device in a paper feeding device that can selectively perform cassette paper feeding and manual paper feeding.

There are two methods: cassette feeding, in which the bottom plate of the sheet cassette is pushed up and the sheets loaded on the bottom plate are brought into contact with a fixed cassette feeding roller to separate and feed the sheets one by one; and cassette feeding, which does not use a cassette. In a paper feeding device that can selectively perform manual paper feeding, in which paper is manually fed using manual paper feeding, there is a problem in that if the bottom plate of the sheet cassette rises during manual paper feeding, the sheets in the cassette will also be fed. .

Further, when the bottom plate push-up lever that pushes up the bottom plate is raised when no sheet cassette is installed, there is a problem that the lever comes into contact with the paper feed roller or the like. Even in the cassette paper feeding mode, the bottom plate is not pushed up when the sheet cassette is not installed, and in the manual paper feeding mode, even if the sheet cassette is installed, the bottom plate is not pushed up. The purpose of the present invention is to provide a bottom plate pressure control device that prevents the bottom plate from being pushed up.

The present invention will be explained below with reference to illustrated embodiments.

First, in FIG. 1, an example of a copying machine equipped with a bottom plate pressure control device of the present invention will be described. Reference numeral 1 indicates a main body of the copying machine. At the top of the main body 1, there is a slider 3, which has a document pressure plate 2 that can be freely connected, and which reciprocates by re-laying the document.
is slidably provided. A cassette 4 is detachably attached to the right side of the main body 1. Further, the right cover 5 of the main body 1 is provided to be openable and closable, and as shown in FIG. 2, when opened during manual paper feeding, the manual paper feed slot 6 is exposed. The inner surface of this cover 5 serves as a sheet guide during manual paper feeding. A stopper 7 is provided below the cover 5 to hold the cover 5 in the open position. A scarlet paper base 8 is disposed on the left side of the main body, and an operation section 10 including a print spade 9 is disposed on the upper front side. Note that reference numeral 11 indicates a lever of a clam paper mode switching lever for selectively switching between cassette paper feeding mode and manual paper feeding. Next, in FIG. 3, the internal structure of the copying machine will be briefly described. Reference numeral 12 indicates a photosensitive drum that rotates in the direction of the arrow. Around the photosensitive drum 12,
A main charger 13, an exposure optical system 14 using an optical transmission material, a magnetic brush developing device 15, a transfer charger 16, a sheet separating device 17, and a static eliminator layer 18 are provided, respectively. An illumination light source lamp 20 is arranged near the optical system 14 to illuminate an original (not shown) placed on the contact glass 19 of the slider 3. A paper feeding device 21 is disposed at the lower right in the figure. This paper feeding device 21 includes a manual paper feeding passage 22, a cassette paper feeding passage 23, a common passage 24, and the above-mentioned passages 22, 2.
3, a pair of registration rollers 25 arranged at the confluence of sheet cassettes 4, a cassette paper feed roller 26 fixed above the sheet cassette 4,
The manual paper feed roller 27 partially facing into the passage 22 and the idle roller 28 separated from the roller 27 are components directly involved in sheet feeding (see FIG. 4), and the components described later. It consists of a drive mechanism. Now print button 9
When is pressed, the photoreceptor drum 12 rotates in all directions,
The surface thereof is charged by the main charger 13.
When the green edge of the image area of the drum 12 is spread directly under the optical system 14, the slider 3 has also started to move, and the edge of the original that has been replaced on the contact glass 19 is placed directly under the optical system 14. It is located directly above. The original image illuminated by two light source lamps is irradiated onto the surface of the photoreceptor drum by the optical system 14, and becomes a static latent image. This static exposure latent image is developed by a developing plate 15 and becomes a toner image. When this toner image rotates to the transfer position, the sheet sent out from the paper feeder 21 is brought into close contact with the photoreceptor drum 12, and the toner image is transferred to the photoreceptor drum by the action of the transfer charger 16. Transferred from the surface to the sheet. After the transfer has been completed, the remaining potential on the photosensitive drum 12 is removed by the removal device 18, and then the photosensitive drum 12 proceeds to a cleaning process. On the other hand, after the sheet is peeled off from the drum surface by the separating device 17, it is sucked by the conveying bag 29 and conveyed in the direction indicated by the arrow. The sheet conveyed by the conveyance device 29 is fed into a pressure fixing device 30, where the top and bottom images are fixed, and then discharged onto the sheet discharge tray 8 by a pair of discharge rollers 31. By the way, for toner image transfer, the photosensitive drum 12
Regardless of whether the sheet is fed from a cassette or manually, it is necessary for the sheet to be sent out to perfectly match the image forming area of the drum, and a pair of registration rollers 25 is provided for this purpose.

The registration roller pair 25 temporarily stops the sheet sent out by the cassette paper feed roller 26 or the manual paper feed roller 27, and then feeds the sheet toward the photosensitive drum 12 in synchronization with the photosensitive drum 12. be. The rotation of the pair of registration rollers 25 is controlled by a signal from means for controlling the rotation of the paper feed roller. First, the cassette feeding mechanism will be described. A pair of cassette holders (only one of which is shown) shown by reference numeral 32 in FIGS. 4 to 6 are installed in the cassette mounting section.

On the mutually opposing surfaces of the cassette holder 32, a protrusion 4a and a recess 4b (
(see FIG. 7) are formed with a guide groove 32a and a stopper 32b that align with each other. At both corners of the front end of the cassette 4, there are corner separators 33 for separating the laminated sheets one by one, as shown in FIG. 7, and at the bottom of the cassette 4. , a bottom plate 34 (see FIG. 8), which is swingable with respect to the cassette body, is provided on which the sheet S is directly placed. Further, the bottom of the cassette body is provided with a window hole 4c into which a bottom plate push-up lever 35 for pushing up the bottom plate 34 is inserted. The bottom plate pressure control mechanism will be explained with reference to FIGS. 6, 8, and 9.

The bottom plate push-up lever 35 has its base 35a fixed to a substantially central portion of a push-up lever support shaft 38 rotatably supported by a pair of support plates 36, 37 (see FIG. 9).

A lever 39 is attached to one end 38a of the lever support shaft 38.
A pin 40 is fixed to the free end of the lever. The pin 40 is loosely inserted into a hole 42a formed at the lower end of a bottom plate push-up link 42 arranged vertically along a side plate 41 (shown only in FIG. 9). A compressible spring 43 for pressing the bottom plate upward is stretched between the cut-and-raised portion 42b provided at the upper end of the upper part 2 of the upper support link 42 and the pin 40. Bottom plate push-up link 4
2 is supported with its substantially central portion pivotally attached to the free end 44a of the support lever 44 by a short shaft 45.

The support lever 44 has its base attached to the side plate 41 on the support shaft 4.
6, it is pivotally mounted to be able to swing freely. Support lever 44
On the side of the side plate 41, a short trumpet, a pulling pin 47, and a long holding pin 48 are grouped together. Furthermore, a lever lowering detection switch SWI is arranged below the base side edge 44b (see FIG. 8) of the support lever 44. The above-described bar 39, link 42, spring 43, and support lever 44 constitute a bottom plate push-up link mechanism. The free end of the holding lever 49 corresponds to the holding pin 48 of the support lever 44 .

The holding lever 49 is pivotally attached to the side plate 41 (see FIG. 9) by a support shaft 50, and the holding lever 49 has a swinging behavior such that its free end is brought into contact with the pin 48 by a spring 51.
is given by. The free end of the holding lever 49 has a holding step 49a that engages and disengages with the pin 48, and a releasing bent portion 4 for disengaging the step from the pin 48.
9b are formed respectively. On the other hand, photoreceptor drum 1
The support shaft 52 of No. 2 has a timing cam 53 and an operating cam 5 that actuates the bottom plate pressurization control device substantially integrally therewith.
4 are attached to each other.

A cam follower 55 is located on the rotation locus of the operating cam 54. The cam follower 55 is provided at one end of a swing lever 57 that is pivotably mounted to the side plate 41 with a ball 56 .

A spring 58 is hung on this swing lever 57,
The cam follower 55 is given a swinging behavior in which the actuating cam 54 is assisted. The other end of the swing lever 57 is connected to the free end of the lifting pin 4 of the support lever 44.
A corresponding lifting lever 59 of 7 is pivotally mounted by a support shaft 60. The pull-up bar 59 is free from the above-mentioned pin 4.
7, and when disengaging this step from the pin 47, the lever 59 can be freely moved up and down with respect to the support lever 57 that has been pulled up once (details will be described later).
A bending portion 59b is formed for each.

Furthermore, between the proximal end of the pull-up bar 59 and the pin 57a fixedly attached to the swing lever 57, a tension spring 61 is hung, and the free movement of the lever 59 is suspended. A swinging behavior is provided in the direction in which the pin 47 comes into contact with the pin 47.
A control lever 62 is pivotally attached to the side plate 41 below the holding lever 49 by a support shaft 63 (see FIG. 11). As shown in FIG. 10, the control lever 62 has a first arm 62a, a second arm 62b, and a second arm 62.
It consists of a pin 64 fixed to b. As shown in FIG. 8, the control lever 62' is connected to the first arm 62a.
is positioned between the pin 47 of the support lever 44 and the free end of the lifting lever 59, and the second arm 62b is positioned so as to be engageable with the bent portion 49b of the holding lever 49. The pin 64 of the control lever 62 also has a counterclockwise direction (
One end of the release lever 65 corresponds to the direction in which the release lever 65 is pressed down (in FIG. 8). This release lever 65 is fixed to one end 66a of a cassette detection shaft 66 rotatably supported on the support plates 36 and 37 (see FIG. 9).
(see figure). One end of a spring 67 is hung on the other end of the release lever 65, giving the lever a swinging habit in a direction that pushes the release lever 62 counterclockwise. A pair of cassette detection levers 68 are substantially integrally fixed to the cassette detection lever 66 . A fork-shaped weighing end 69a of a punch 69 is loosely engaged with the pin 64 of the control lever 62.

The end 69a of the lotus pestle 69 is rotatably attached to one end of a paper feed mode cutting bar 71 which is pivotably attached to the side plate 41 by a support shaft 70. Lotus pestle 69 and the above cutting bar 71
The head of a shaft 72 which is rotatably connected to each other is extended, and is positioned on the rotation trajectory of the shaft 72 when the cutting bar 1, which will be described later, swings. The actuator SW2a of the switch SW2 is pushed. The switching lever 71 is fitted with a spring 74 whose one end is hung on a pin 73 fixed to the side plate, and the lever is switched between the cassette paper feed mode shown by the solid line in FIG. 8 and the manual paper feed mode shown by the chain line in FIG. The mode is meant to be preserved in both imitations. The other end of the paper feed mode switching lever 71 protrudes from the side of the copying machine body to the outside, and is connected to the cover 11 (see FIG. 1).
(see Figure 2) is fixed. The bottom plate pressurization control device shown in FIG. 8 shows a state in which the cassette 4 is attached and the bottom plate 34 is pushed up, but FIG. 20 shows a state in which the cassette is not attached. .

The operation of this mechanism will be described later.

Next, the cassette paper feed roller and manual paper feed roller.

The rotation control mechanism of the registration rollers will be explained based on FIG. 9 and FIGS. 12 to 15. Note that, for convenience of explanation, FIGS. 13, 14, and 15 are views of the mechanism from the rear. First, the registration roller pair 25 consists of a drive-side registration roller 75 and an idle low-foo 76 driven by the driving-side registration roller 75.

The registration roller 75 is connected to the side plates 41, 142 with its shaft 77.
(See Figure 9). This bag 7
A one-way clutch 78 and a pair of sprockets 19 and 80 that are substantially integral with the one-way clutch 78 are attached to the shaft end where 7 protrudes from the side plate 142. And sprocket 7
9 has a chain 81 (first
(see Figure 5) is wrapped around the registration roller 75.
Rotate in the direction of the arrow. Although the details will be described later, when the one-way clutch 78 is engaged, the dystroller pair 75
will be stopped. On the other hand, the idle roller 76 is rotatably and vertically movable above the registration loaf 75 and is attached to the side plate 41.
, 142, and is pressed against the pair of registration rollers 75 by a spring (not shown).

In FIG. 15, at one end of the shaft 52 of the photosensitive drum 12, there are provided a drum driving gear 82, a wire drum 83 for driving the slider 3 (see FIG. 1), a slider backward movement gear 84, and a slider timing drum 85, respectively. It is installed.

A pin 86 is fixed to the slider timing drum 85 as a paper feed start signal source. Note that during one copying operation, the photosensitive drum 12 rotates twice in the direction of the arrow and stops by the gear 82, and the wire drum 83 and gear 84 rotate in the same direction as the drum 12 during the first rotation. However, during the second rotation of the drum 12, it reverses in the direction shown by the broken line and stops at the starting position, and the timing drum 85 rotates integrally with the photosensitive drum 12 for one rotation. In the second rotation, it stopped at the starting position. Next, the cassette paper feed roller 26 and the manual paper feed roller.

27 is arranged such that respective shafts 87 and 88 are rotatably supported by support plates 36 and 37.

A gear 89 is fixed to the end of the shaft 87. A gear 90 is fixed to the shaft mechanism protruding from the side plate 142 of the shaft 88. The paper feed rollers 26 and 27 are both attached to the koji via one-way clutches (not shown). On the other hand, a stopper support shaft 91 is rotatably supported on the side plates 41, 142, and a cassette paper feed roller drive gear 92 and a manual paper feed roller drive gear 93 are fixedly mounted at the end of the stopper support shaft 91. At the same time, the driving sprocket 9
4 and a one-turn clutch 95 that disconnects the support shaft 91 is installed.

Further, at the end of the one-turn clutch 95, there is a cam 96 that controls the rotation of the registration roller and the paper feeding operation of the manual paper feed roller.
is fixed. The core 87 of the cassette paper feed roller 26
The gear 89 and the drive gear 92 are rotationally integrated through an idle gear 97 pivotally mounted to the side plate 142.

Further, the gear 90 of the shaft 88 of the manual paper feed roller 27 and the driving gear 93 are engaged with each other. Further, the sprocket 94 includes idler sprockets 98, 99, 100.
A chain 102 is wound around the tension sprocket 101 and transmits the rotation of a sprocket 80 connected to a drive source.

In addition, in FIG. 12, tension sprocket 1
01 is not shown. The one-turn clutch 95 has a locking portion 10 at one end of a detection lever 103 that engages and disengages the one-turn clutch 95.
3a corresponds to the locking hand.

This detection lever 103 is pivoted by giving the side plate 142 (see FIG. 9) the swinging behavior of the above-mentioned locking hand by a swingable headband 105 (see FIGS. 12 and 13) on a support shaft 104. It is worn. The other end 103b of the detection lever 103 is located on the turning locus of the pin 86 of the timing drum 85. Above the manual paper feed roller 27, the roller 2
An idol roller 28 that can be adjusted freely is placed at 7.

The idle roller 28 is fixed to a support shaft 106, and both ends of the shaft 106 are supported in the holes 107a of a pair of arms 107 so as to be vertically movable and rotatable.
(See Figure 16). The pair of arms 107 have their bases rotatably supported on the side plates 41 and 142.
It is fixed to 08. As shown in FIG. 16, a leaf spring 109 is fixedly installed in the center of the support shaft 108, which directs the idle roller 28 downward, in other words, through the elongated hole 1.
The shaft 106 is pressed in a direction to bring it into pressure contact with the manual paper feed roller 27 in the range 07a. The support shaft 108
A lever 111 having a cam follower 110 fixed to its free end is fixedly mounted on the shaft end 108a. This lever 11
1 is given a rocking behavior by a spring 112 in a direction in which the cam follower 110 is brought into contact with the cam 96, in other words, in a direction in which the idle roller 28 is pressed against the paper feed roller 27 (FIGS. 13 and 16). figure). On the other hand, side plate 1
42 (see FIG. 9) is a locking bar 11 that engages and disengages a one-way clutch 78 that controls the rotation of the registration roller 75.
3 is pivotally mounted by a stud 114 so as to be able to swing freely. A locking end 113a of the locking bar 113 faces the clutch 78 from below (see FIGS. 12 and 13). Then, the locking bar 1 13 and the locking bar 11
1 and is connected by a link 115.

The aforementioned bars 111, 113 and link 115 constitute a link mechanism. The locking bar 113 and the link 115 are connected by an elongated hole 115a and a headed pin 113b, and the pin 11 is connected to the pin 113b and the link.
5b, a spring 116 is stretched across it. Stopper support shaft 9 on which the one-turn clutch 95 is mounted
As shown in FIG. 16, a pair of stopper supports 117 are inserted into the support member 1 so as to be rotatable while being restricted from moving in the thrust direction.

A sheet stopper 18 having a bent tip is fixed to each end 117a of the support 117.
The weight of the sheet stopper 118 causes the support body 117 to rebound around the support ball 91 in all directions (as shown in FIG. 17).
2. It has a rocking habit that blocks this. The stopper support 1 17, which swings under its own weight, has its other ends 1 1
7b is engaged with the shaft 106 of the idle roller 28 from below. The leading edge of the sheet stopper 118 is formed into an interrupted edge, and the manual paper feed path 22 (the 17th
The discontinuous edge 1 19a (see FIG. 19) of the upper guide member 1 19 that constitutes the upper guide member 1 19 (see FIG. 19) is inserted into each other. The guide section 119 is provided with a window 119b through which the idle roller 28 enters and exits. Further, the manual paper feed roller 27 has a part of its circumferential surface facing into the sheet paper feed path 22.

The cover 5 (see FIG. 2), which serves as a sheet guide during manual paper feeding, has its base rotated by a support member 120 provided near the manual paper feed port 6, as shown in FIG. It is freely pivoted and held in that position by a stopper 7 during manual paper feeding. The bottom plate pressure control device in the paper feeder of the present invention is configured as described above.

The operation of this device will be explained below, starting with the cassette paper feeding mode.

FIG. 20 shows a state in which no cassette is installed. To briefly explain this state, the control lever 62 presses its pin 64 with one end 65a of the release lever 65 (
(see FIG. 21), it is pushed counterclockwise around the shaft 63.

Due to the bridge movement of the control lever 62, the first arm 62a pulls up and engages the bent portion 59b of the bar 59, and the second arm 62b engages the bent portion 49b of the holding lever 49, so that both levers 59
, 49 are swung against their respective oscillating habits and held in that position. Further, the bottom plate push-up link 42 is lowered by its own weight, causing the lever 39 to swing. The swinging of the lever 39 swings the bottom plate push-up lever 35 to the lowered position via the support shaft 38. Further, the support lever 44 is also swung by the link 42, and its lower edge operates the lever lowering detection switch SWI. This detection switch SWI detects the lowering of the support lever 44, in other words, the lowering of the bottom plate push-up lever 35, thereby detecting that no cassette is installed, and disables the copying operation of the copying machine. is designed to remain inactive. however,
In the manual feed mode, the manual feed detection switch SW2 is activated, and this switch SW2 is configured to operate with priority over the switch SWI. Then, in the state shown in FIG. 20, the cassette 4 is placed in the cassette holder
2 (see FIGS. 5 and 6), the front plate 4d of the cassette is attached to the cassette detection lever 6, as shown in FIG.
8 and swing it clockwise.

As the detection lever 68 swings, the release lever 65 also swings in the same direction via the support ball 66 to release the pushing action against the control lever 62. When the restraint on the control lever 62 is released, the pins 47 and 48 of the support lever 44 are moved by the respective habits of the pull-up lever 59 and the holding lever 49.
swings to a position where it can be engaged with. The positions of both levers are regulated by the pin 64 of the control lever 62 coming into contact with the bottom of the fork-shaped insertion end 69a of the Hasumura 69 positioned in the cassette paper feeding mode. When the print button is pressed and the photosensitive drum 12 begins to rotate, the operating cam 54 that is substantially integrated therewith also rotates from the starting position shown by the solid line in FIG. 8 to the operating position shown by the chain. At this time, the cam surface pushes the cam follower 55 to the chain line position.

As a result, the swing lever 57 swings from the chain line position to the solid line position, and pulls up the pull-up bar 59 pivotally attached to one end thereof. When the pull-up lever 59 is pulled up, the pull-up step portion 59a engages with the pin 47, and as shown in FIG. The end 44a is raised.

The raised position of the lever 44 is held by the holding pin 48 engaging with the holding step 49a of the holding lever 49, as shown in FIG. As the support lever 44 is raised, the bottom plate push-up link 42 is raised. As the bottom plate push-up link 42 rises, the spring 4
3, the lever 39 is elastically swung counterclockwise, and the integrated bottom plate push-up lever 35 is swung counterclockwise via this lever and the support shaft 38, thereby raising the bottom plate 34. As the bottom plate 34 rises, the sheets stacked on it also rise, and the topmost sheet is transferred to the cassette paper feed roller 26.
(See Figure 8).

Even if the number of sheets decreases as sheets are fed, the bottom plate push-up lever 35 continues to push up the bottom plate 34 due to the elasticity of the spring 43. The above is the bottom plate pushing up operation of the bottom plate pushing up mechanism in the cassette paper feeding mode.

Next, the operation of the rotation control means for the distroller, which is used as the paper feed control means for the cassette paper feed roller, will be explained with reference to FIGS. 12 to 15.

First, to explain the starting position of each of the control means described above with reference to FIGS. 12, 13, and 15, the registration roller 1
5 is a sprocket 7 connected to a drive source (not shown)
9 rotates in the direction of the arrow, and the cassette paper feed roller 26
The one-turn clutch 95 is stopped because it is locked by the detection lever 103.

Also, by stopping the one-turn clutch 95, the cam 96
is also stopped, and the cam follower 110 of the lever 111 is riding on its large diameter portion. Therefore, the lever 111 is swung against its natural habit, and the lever 111 is locked via the link 115 that constitutes the link mechanism, and the lever 113 is also swung, and the lever 113 is also swung. The toe 113a is spaced apart from the one-way clutch 78. Now, when the printing plow is pressed and the photosensitive drum 12 (see FIG. 15) starts to rotate, the timing drum 85 rotates together with the photosensitive drum 12, and the pin 86 fixed in the drum moves to the detection lever 103.
is engaged with one end 103b of. As the detection lever 103 swings, the locking end 103a of the detection lever 103 is disengaged from the engagement recess 95a of the one-turn clutch 95 (see FIG. 14), so that the sprocket 94, which is connected to the drive source and is rotating, is rotated. is transmitted to the support shaft 91. The rotation of the support shaft 91 is transmitted to the gear 89 of the cassette paper feed roller 87 via a gear 92 and an idle gear 97, which are integral with the support shaft 91, thereby rotating the paper feed roller 26 in all directions. The above detection lever 103
After the locking end 103a is released from the concave portion of the one-turn clutch 95, it is pressed against the circumferential surface of the clutch due to the habit of the lever, and when the clutch makes one rotation, the locking end 103a returns to the concave portion 95.
Drop down to a and lock it.

Therefore, when the one-turn clutch 95 makes one revolution, the rotation to the cassette paper feed roller 26 is also cut off. When this paper feed roller 26 is stopped, the uppermost sheet S in the cassette 4 has been separated into one sheet and sent to the cassette paper feed path 23, and its leading edge Sa is stopped (
(see FIG. 14). The delivered sheet is struck with some dust. On the other hand, when the one-turn clutch 95 is released, the cam 96 rotates.

When the cam 96 rotates, the cam follower 110, which had been riding on the large diameter part until now, falls to the small diameter part (see Fig. 14), and the lever 111, link 115, and locking bar 113 that make up the link mechanism also swing. make it move. As the locking bar swings, the locking device 113a engages with the one-way clutch 78, and stops the registration roller 78 that has been rotating. The registration roller 78 stops before the sheet sent out by the cassette paper feed roller 26 reaches the roller. The stop time of the registration roller 78 is determined by the time during which the cam follower 110 is in contact with the small diameter portion of the cam 96.
10 rides on the large diameter portion of the cam and the link mechanism swings, the locking end 113a disengages from the one-way clutch 78 and the registration roller rotates again. Registration roller 78
The timing at which the cam 96 rotates again is determined by the set position of the cam 96 so that the leading edge of the sheet thus sent out and the leading edge of the image forming area of the photosensitive drum 12 match at the transfer position.

Note that the sheet is fed into the pair of registration rollers 25 with a slight sag.
The sheet, whose rear portion is held down by the paper feed roller, is gripped by a pair of registration rollers that rotate by its own rigidity, so-called stiffness. Cassette paper feeding is performed as described above.

As shown in FIG. 8, the bottom plate push-up mechanism
4 is held in the raised position. The above mechanism is
One cassette 1. When placed in the paper feeding mode, the operating cam 54 is maintained in this mode and when the photoreceptor drum 12 rotates, the actuating cam 54 moves through the cam follower 55 to the swinging lever 57.
is swung between the solid line position and the chain line position shown in FIG. 8, but the pull-up lever 59, which is pivotally attached to one end of the swiveling lever 57, is simply moved up and down. That is, after the support lever 44 is raised by the lifting bar 59 according to the rotation of the cam 54, the swing lever 57 swings as shown by the chain line in FIGS. 8 and 23 according to the action of the spring 58. It's moving. Even if the operating cam 54 rotates, the pull-up bar 59 simply moves up and down between the solid line position and the chain line position, as shown in FIG. It's not something that moves you. Next, the operation of the above mechanism will be explained when the cassette 4 that has been installed and whose bottom plate has been pushed up is taken out.

When the cassette 4 is pulled out to the right with the bottom plate 34 pushed up as shown in FIG.
The cassette detection lever 68, which had been pushed at d (see FIG. 22), swings counterclockwise by the elasticity of the spring 67 (see FIG. 21).

The swinging lever 65 of this lever 68 swings in the same direction,
One end thereof engages pin 64 to push control lever 62 counterclockwise. This swinging of the control lever 62 is caused by the second arm 62b engaging the bent portion 49b of the holding lever 49, and moving the lever 49 clockwise to disengage the holding step 49a from the pin 48. Also, the first arm 62a engages with the bent portion 59b of the lifting bar 59, and swings the lever 59 clockwise so that the lifting step portion 59a and the pin 47 do not engage with each other. FIG. 21 shows the movement of each lever immediately after the cassette 4 is removed, and after this, the holding action of the holding lever 49 is released and the bottom plate push-up mechanism is moved to the second position.
0 to the lowered position shown in Figure 0. That is, the support lever 44 whose holding action to the push-up position by the holding lever 49 has been released by the control lever 62 moves to the bottom plate push-up link 42.
is lowered by its own weight.

This lowers the link 42, swings the bottom plate push-up lever 35 clockwise via the lever 39 and the support shaft 38, and lowers the bottom plate 34 (see FIG. 8). The lowering of the bottom plate push-up lever 35 described above is approximately at the same time as the front plate 4c of the cassette separates from the cassette detection lever 68, which can be said to be the initial operation when pulling out the cassette 4 from the holder 32 (see FIG. 6). When the cassette is removed, it is lowered as shown in FIG. 20, and does not become an obstacle to removing the cassette. Further, a switch SWI that detects the lowering state of the bottom plate push-up mechanism is actuated by the support lever 44.

Next, the manual paper feeding mode will be explained.

When performing manual paper feeding, there are two states of the copying machine.

These are the state in which the cassette is attached and the state in which it is not. When the cassette is not installed, the bottom plate push-up lever 35 does not rise as described above, but when the cassette is installed and manual paper feeding is performed,
There is a problem where paper is also fed from the cassette.
Manual paper feeding needs to be prioritized. In addition, when the cassette is not installed, in other words, when the bottom plate push-up mechanism is lowered and the lever lowering detection switch SWI is activated, copying cannot be performed. It is necessary to disable SWI. If you want to manually feed paper now, first
As shown in the figure, the cover 5 as a sheet guide is swung to open the manual paper feed port 6 (see Fig. 17), and the paper feed mode switching lever 71 is turned on to feed the cassette paper indicated by the solid line in Fig. 8. mode to the manual paper feeding mode indicated by the two-dot chain line 71A.

The operation of the lever 71 during the mode switching will be explained with reference to FIG. 24. When the lever 71 swings around the shaft 70, the shaft 72 provided at one end of the lever 71 moves to the manual detection switch SW.
2 (see Figures 6 and 8) actuator SW2
Press a to activate the switch. This switch S
Activation of W2 displays at a suitable location on the copying machine that the paper feeding device is switched to manual paper feeding mode, and also disables the operation of the lever lowering detection switch SWI. Further, in the cassette paper feeding mode, when repeat copying is being performed, the repeat counter is made inactive. Also,
When the switching lever 1 switches from the solid line position to the manual paper feeding mode shown by the two-dot chain line 71A, the fork-shaped pushing end 69a of the Hasumura 69 pivoted to this lever moves back and forth in the left and right directions in the figure. do. At the time of this lotus pestle 69,
The bottom of the pushing end 69a pushes the pin 64 of the control lever 62 from the solid line position to the release position shown by the chain line 64A.
After the lotus pestle 69 reciprocates from the solid line position 69 to the 1'-1' chain line 698, it returns to the manual paper feeding mode position shown by the two-dot chain line 69A in accordance with the swinging of the bar 71 described above. The position of the paper feeding mode switching lever 71 in each mode is maintained when the spring 74 (see FIGS. 6 and 8) crosses a dead point. By the movement of the punch 69, the control lever 62 is swung as shown in FIG. Push against it.

Then, when the cassette is attached and the bottom plate lifting mechanism is raised, the control lever 62
9 and pins 47, 48, lower the side of the aircraft, and use each arm 62a, 62b to lower each lever to the position shown in FIG. 20, where both levers 59, 49 and pins 47, 48 cannot engage 5
Press 9,49. If the cassette is not installed, the lifting bar 59 and the holding lever 49 are already connected to the pin 47 by the control lever 62 as shown in FIG.
48 and is pushed to a position where it cannot engage. The swinging position of both the levers 59, 49 is maintained by the bottom of the fork-like sardine end 69a of the lotus pestle 69 coming into contact with the pin 64 of the control lever 62. When the cassette is not installed, the swinging position of both levers 59, 49 is spring 6.
It is also held when the release lever 65 is pressed by the lever 7.
Although the length of movement of the lotus pestle 69 to disable the operation of the bottom plate push-up mechanism is small, the positional relationship with the pin 64 is exaggerated in FIGS. 24 and 25. It is shown. As described above, by switching the paper feeding mode switch, the paper feeding device is placed in the manual paper feeding mode.

Next, the operation of the manual paper feed roller 27 will be explained.

The rotation of the manual paper feed roller 27 is controlled by the rotation control means for the cassette paper feed roller 26.

That is, in FIG. 13, when the print button is pressed,
When the timing drum 85 rotates and the pin 86 swings the detection lever 103, the one-turn clutch 95 is released. The rotation of the one-turn clutch 95 is controlled by the cassette paper feed roller 2 through the gear 92, the idle gear 97, and the gear 89.
6 is rotated, and the manual feed roller 27 is also rotated via the gears 93 and 90 (see Figs. 12, 15 and 1).
(See Figure 6). Furthermore, when the one-turn clutch 95 rotates, the cam 96 that is substantially integrated therewith also rotates, causing the lever 111 to swing.

The cam 96 and the bar 111 control the rotation of the pair of registration rollers 25 as described above, but also control the alignment of the idle roller 28 to the manual drawing roller 27. That is, as shown in FIG. 17, when the cam follower 110 that has been riding on the large diameter part of the cam 96 falls onto the small part as shown in FIG.
(see figure) causes it to swing counterclockwise. By swinging the lever 111, the support shaft 108 and the body of the lever 111 are
A pair of arms 107 swing in the same direction, and the idle roller 28 supported by the arm is pressed by the elastic force of a leaf spring 109 (see FIG. 16). The idle roller 28 rotates in response to the rotating manual paper feed roller 27. When the arm 107 swings, the shaft 106
engages with the stopper support 117b, and this support 11
7 in a clockwise direction around the support shaft 91 against its rocking behavior due to its own weight, and the sheet stopper 118 provided at the other end 117a is retracted from the manual paper feed path 22 (
(See Figure 18).

When the one-turn clutch 95 rotates once, the cam follower 110 rides on the cam 96, causing the lever 111 to swing, the support shaft 108 and the arm 107 to rotate, and to push the seat stopper support 117. By releasing the operation, the idle roller 28 is separated from the roller 27 and the seat stopper 118 enters into the passage 22, as shown in FIG.

As described above, the manual paper feed mechanism is configured to operate simultaneously with the operation of the cassette paper feed mechanism.

If you want to manually feed paper now, first switch the paper feed mode switching lever 71 to the manual paper feed mode (indicated by reference numeral 71A in FIG. 8), and then close the cover 5 as shown in FIG. Open it and insert a sheet (transfer paper) of a desired size into the passage 22 from the manual paper feed port 6.

At this time, the sheet (not shown) has its tip end at the 17th point.
As shown in the figure, the seat stopper 118 is placed so as to block the passage 22. Afterwards,
When the print button is pressed, the photosensitive drum 12 and the timing drum 85 (see FIG. 15) rotate, and the pin 86 of the drum 85 swings the detection lever 103.

As described above, the swinging of the lever 103 releases the one-turn clutch 95, swings the idle roller 28 via the cam 96 and lever 111, and retracts the seat stopper 118 from the passage 22. When the idle roller 28 descends and presses the sheet against the rotating manual picture paper roller 27, the sheet moves along the passage 22 to the left (
(in FIG. 18), and at this time it collides with the stopped registration roller pair 25 and stops. The sheet whose tip is abutted against the pair of registration rollers 25 has a slight mirror appearance, the one-turn clutch 95 rotates once, and the manual feed*synthetic fiber roller 27 stops,
When the pair of registration rollers starts rotating, the paper is held in the pair of rollers 25 due to its stiffness. The above-mentioned sheet sagging occurs when the sheet feed amount of the manual paper feed roller 27 is changed by the sheet stopper 118 and the mist. This is given by setting the length slightly larger than the length between the pair of rollers 25. Further, the distance from the pair of registration rollers 25 to the sheet stopper 118 is determined to be equal to the distance from the pair of registration rollers 25 to the leading edge of the sheet when paper is fed from the cassette. To re-rotate the stopped pair of registration rollers 25, the lever 111 is activated by the cam 96.
The locking bar 113 is started by releasing the one-way clutch 78 through the link mechanism, but the reason why the idle roller 28 separates from the picture paper roller 27 is when the idle roller 28 moves away from the picture paper roller 27. Since it is supported by the elongated hole 107a (see FIG. 16) of the arm 107, the rotation is slightly delayed from the start of rotation of the pair of registration rollers.

Regarding the manual paper feeding mechanism explained above, when performing manual paper feeding, the paper feeding mode switching operation and the opening and closing operation of the cover as a sheet guide are performed, but both The motion can also be performed in one motion.

That is, when the cover serving as a sheet guide that opens the manual paper feeding path is opened, the paper feeding mode is automatically switched to the manual paper feeding mode. This embodiment is shown in Figures 26 to 2.
This will be explained based on FIG. 7, and a modification of the bottom plate pushing-up machine foundation will also be explained. Note that components having the same configuration as those already described are given the same reference numerals, and individual explanations will be omitted. The swing lever 57, the holding lever 490, the support lever 44, and the control lever 620 are each pivotally attached to the support plate 121 so as to be swingable.

A bottom plate push-up link 420 is pivotally connected to the free end of the support lever 44 by a shaft 45. The link 42 can be moved up and down by loosely aligning its guide groove 420a with the Arito pin 122 fixed to the side plate 41 (see FIG. 9).
Further, between the upper end 420b of the link 420 and the pin 400 at one end of the lever 39, there is a spring 430 for pressing the bottom plate.
is being passed over. The pin 400 has a roller 123
This roller corresponds to the lower end 420c of the above-mentioned IJ link 420. Pin 64 of control lever 620
In the river, the fork-shaped pushing part 690a of the lotus village 690 is gently drumming. On the other hand, a paper feed mode switching lever 710 is pivotally attached to the side plate by a support shaft 700, and one end 690b of the punch is pivotally attached to one end of the lever 710 by a shaft 720.

The abutting end 710a of the bar 710 mentioned above is bent and then protrudes from the vicinity of the manual paper feed port 6 (see FIG. 4). Further, one end of the same lever 710 is bent and serves as a pushing part 710b of the manual detection switch SW2. The above-mentioned bar 710' is loaded with a spring 740, and the bale end 710' is rotated around the support shaft 700.
A is given a rocking habit in the direction of directing the cover 5 to the cover 5. Therefore, the Hasui 690 is given the habit of moving the control lever 620 counterclockwise, in other words, in a direction that disables the bottom plate push-up mechanism. The habits of the entrusted lever 710 and Hasumura 690 are regulated by the lever's supporting end 710a supporting the cover 5 (see FIG. 26), and as shown in FIG. When opened, the above-mentioned restriction is canceled and the switchover is made to the manual paper feeding mode in which the bottom slope push-up mechanism is placed in an inactive position. Furthermore, Figure 26 shows the bottom plate push-up mechanism (the release lever and cassette detection lever are not shown) with a cassette (not shown) installed, and when the cassette is removed, the aircraft is in the inactive position. The situation is the same as in the export example.

To perform manual paper feeding in the state shown in FIG. 26, rotate the cover 5 clockwise around the edge 5a until it touches the stopper 7 (see FIG. 17).
(See Figure 8). By rotating the cover 5, the cutting bar 71
0 rotates to the right due to the elasticity of the spring 740, and the pushing part 710b
is the actuator of manual detection switch SW2 - SW2a
At the same time, the fork-like pushing part 690a is pushed through the lotus pestle 690 to push the pin 640 to release the control lever 62.
0 to place the bottom plate push-up mechanism in the inoperative position. By swinging the control lever 620, the pull-up bar 590 and the holding lever 490 are pushed and held in a position where they cannot engage with the support lever 44.

Further, the support lever 44 that has been disengaged from the holding lever 490 descends and lever lowering detection switch SW1 (eighth
(see figure), but the switch SW2 takes precedence over the operation of this switch. As the support lever 44 descends, the bottom plate push-up link 420 descends, and its lower end 42
0c is supported by Ko 123, and the push-up lever 35 is swung. After this, the sheet is inserted into the manual paper feed path 22 as described above.

As explained above, the bottom plate pressurization control of the present invention lowers the bottom plate push-up lever when the sheet cassette is not installed and when the cassette is installed but switched to manual paper feeding mode. According to the device:
Since paper is fed only from either manual paper feed or cassette paper feed, there is no problem of two sheets being fed into the sheet path.

Furthermore, even in the cassette paper feeding mode, if a sheet cassette is not installed, the bottom plate push-up lever will not rise, so it is possible to prevent an unexpected situation in which the lever comes into contact with a paper feeding roller or the like.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a copying machine equipped with the bottom plate pressure control device of the present invention, FIG. FIG. 4 is a front view showing an overview of the inside of the copying machine, FIG. 4 is a front sectional view showing the paper feed path, and FIG.
The figure is a front view showing the cassette holder, FIG. 6 is an exploded perspective view showing an example of the bottom plate pressure control device of the present invention, FIG. 7 is a perspective view showing only the essential parts of the sheet force set, and FIG. 8 is the present invention. 9 is a plan view of essential parts of the bottom plate pressure control device of the present invention, FIG. 10 is a perspective view showing only the control lever 62, and FIG. 11 is a view showing the control lever and other parts. FIG. 12 is a front view showing the drive mechanism of the paper feeding device, FIG. 13 is a rear view of the same as above, FIG. 14 is an operational view of FIG. 13, and FIG. 15 is a side view showing the correspondence relationship with the lever. An exploded perspective view of the drive mechanism;
Fig. 16 is a perspective view showing the main parts of the manual paper feed mechanism, Fig. 17 is a front view showing the manual paper feed mechanism before operation, and Fig. 18 is a perspective view showing the main parts of the manual paper feed mechanism.
7 is an operational view, FIG. 19 is a perspective view showing the positional relationship between the manual paper feed roller and the guide member, FIG. 20 is a front view showing the bottom plate pressure control device in the lowered position, and FIG. 21 22 is a partially sectional front view showing the correspondence between the sheet cassette and the cassette detection lever, and FIG. 23 is a front view of the bottom plate pressure control device immediately after the seat cassette is removed. Main part front view showing how the Oshiagetaka is held, 2nd
Figure 4 is a front view showing the movement of the paper feed mode cutting bar;
FIG. 5 is an enlarged front view of the main parts of the same as above, FIG. 26 is a front view showing another embodiment of the bottom plate pressure control device, FIG. 27 is a perspective view showing another example of the paper feeding mode switching means, and FIG. FIG. 28 is an operational view of FIG. 26. 4...Sheet cassette, 25...Cassette paper feed roller, 27...Manual paper feed roller, 34...
...Bottom plate, 35...Bottom plate push-up lever, 4
9... Holding lever, 59... Lifting lever, 62... Control lever, 65... Release lever, 68... Cassette detection lever. Rarely drawn Z map ~ Tsunazu heart 4th map 5th map 7th map ゎ Zufuchi 8th map? Diagram: Disliked diagram: Boar'4 Diagram: Box lamp diagram

Claims (1)

[Claims] A paper feeding device that allows you to select between a cassette paper feeding mode in which the bottom plate of the sheet cassette is pushed up and the sheets stacked on it are pressed into contact with a stationary cassette paper feeding roller, and a manual paper feeding mode that does not use a sheet cassette. , a bottom plate push-up lever that can freely come into contact with and separate from the bottom plate of the sheet cassette; a bottom plate push-up link mechanism that gives the bottom plate push-up lever a habit of pushing up the bottom plate; and a bottom plate push-up link mechanism that synchronizes with the rotation of the photoreceptor. a lifting lever that reciprocates in a direction to raise the bottom plate from the lowered position to the pushed up position; a holding lever that holds the bottom plate pushing up link mechanism in the pushed up position; a cassette detection lever that detects whether or not a seat cassette is attached; When the sheet cassette is installed and the bottom plate is pushed up, the pull-up lever and the bottom plate push-up link mechanism are disabled, and when the sheet cassette is not installed and the bottom plate is pushed up, the pull-up lever is disabled. a control lever for disengaging the lever/holding lever from the bottom plate push-up link mechanism; and a release lever that is substantially integrated with the cassette detection lever and causes the control lever to perform a release operation when no cassette is installed. , a paper feeding mode switching means that holds the control lever in the release position during manual paper feeding, and sets the bottom plate push-up lever to the inactive position when no cassette is installed or in the manual paper feeding mode. The bottom plate pressure control device is characterized by the following: