JPS6240706B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copying machine, particularly a small copying machine.

In recent years, copying machines have been required to be compact, high-performance, and versatile.

However, in such a copying machine, various mechanisms must be packed and installed in a narrow space within the copying machine main body, and maintenance, inspection, paper jam removal, etc. of the copying machine are extremely time-consuming.

That is, in conventional copying machines, the paper transport path is appropriately divided, and each of the divided unit transport paths can be pulled out independently from the main body of the copying machine, so that jammed paper can be removed.

However, in a copying machine with this structure, it is not possible to detect which unit transport path the paper is jammed in, so each unit transport path must be pulled out from the copying machine body in sequence to check whether paper is jammed or not. If paper becomes jammed in the unit conveyance path at the final stage, it is necessary to pull out all the unit conveyance paths and pull out all the paper remaining in each unit conveyance path, which makes the paper jam removal operation troublesome. ing.

The present invention was made in view of the above circumstances, and its purpose is to enable the entire paper conveyance path to be pulled out from the copying machine body as one unit, and to also be able to pull out only the paper feed tray from the conveyance path. The objective is to provide a copying machine with the following features.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a photoconductor photosensitive layer 1 on the surface.
It is a photosensitive drum equipped with a photosensitive drum 1, and around the photosensitive drum 1 are a light image irradiation device 2, a developing device 3, a pre-transfer charging corotron 4, a transfer corotron 5, a peeling corotron 6, a strip puff finger 7, and a pre-cleaning corotron. Corotron 8, optical system 9 for static elimination before cleaning and charging,
A cleaning device 10 and a charging corotron 11 are provided and constitute the most common copying process, and perform well-known functions to develop the electrostatic latent image created on the surface of the photosensitive drum 1 and transfer it to paper. It makes a copy.

A is the conveyance path frame that constitutes the paper conveyance path,
The conveyance path frame A has a pair of substantially U-shaped side plates a,
a, a pair of side plates a, and a lower cover plate b that covers the lower part of a.
and a pair of side plates a and an upper cover plate c that covers the upper part of a, forming a substantially U-shaped hollow structure. Sliding pieces 24b, 24b that slide on the pair of guide rails 24a, 24a constitute a pull-out guide member 24 for the transport path frame A, so that the transport path frame A can be freely pulled out from the main body of the copying machine.

Note that the upper cover plate c extends up to the vicinity of the photosensitive drum 1 and is open at the top after the photosensitive drum 1, and a cutout d is cut in the lower part of the photosensitive drum 1 of the pair of side plates a and a for transportation. It is formed so as not to interfere with the transfer corotron 5 and the peeling corotron 6 when the path frame A is pulled out.

Reference numerals 12 ₁ and 12 ₂ denote first and second paper feed trays, and a sliding piece 6 slides on a guide rail 60a provided on the transport path frame A and a guide rail 60a provided on the copying machine main body.
0b, and the first and second paper feed trays 12 ₁ and 12 ₂ can be freely pulled out from the copying machine main body and the conveyance path frame A.

The first and second paper feed trays 12 ₁ and 12 ₂ hold stacks of paper cut to a certain size, and are provided with a bottom plate that can be moved up and down on which the stack of paper is placed. The uppermost sheet of the stacked sheets is configured to come into contact with first and second feed rollers 13 ₁ and 13 ₂ provided near the entrance of the conveyance path.

The transport path frame A has first and second feed rollers that rotate together with the first and second feed rollers 13 ₁ and 13 ₂ .
Double feed prevention belts 14 ₁ , 14 ₂ and fixed first and second double feed prevention rolls 15 ₁ , 1 that are in sliding contact with these belts.
5 ₂ is provided, and the topmost paper of the stacked papers in each paper feed table 12 ₁ , 12 ₂ is prevented from being fed double one by one and is reliably fed to the first and second transport roll pairs 16 ₁ , 16 ₂ . It is configured so that In addition, the first and second
The rotation of the feed rolls 13 ₁ and 13 ₂ is controlled by a signal from a cycle cam or the like provided on the rotation shaft of the photosensitive drum 1 .

The paper transported by the first and second transport roll pairs 16 ₁ and 16 ₂ is transferred to the first
It is sent to the slip roll pair 17 provided in the middle of the transport path frame A through the second transport paths e and f, and then passes through the main transport path g provided in the transport path frame A to the register roll provided in the transport path frame A. Sent to vs. 18. The slip roll pair 17 has a structure in which a large-diameter sponge roll 17a and a small-diameter rubber roll 17b are rotated in loose contact with each other under low pressure. The leading edge of the paper is stopped until it reaches a certain position, the leading edge of the paper is stopped for alignment with the image, and the paper is sent out to the transfer section B again at an appropriate timing. In addition, this register roll pair 1
8 is stopped, the slip roll pair 17 is rotating, but the conveying force is weak, so the paper is not forced into the register roll pair 18 and the paper is kept in constant contact so that the leading edge of the paper does not separate from the register roll pair 18. There is.

The powder image on the circumferential surface of the photosensitive drum 1 is transferred to the paper sent out at an appropriate timing at the transfer position B (transfer corotron 5), and the powder image is transferred from the photosensitive drum 1 by the stripper finger 7 and the peeling corotron 6. The film is peeled off and sent to the fixing device 70 by the vacuum transport 19.

The fixing device 70 is attached to a guide rail 80a on the main body of the copying machine.
and a frame c that can be freely drawn out via a drawer guide member 80 consisting of a sliding piece 80b,
A heat roll 20 and a pressure roll 21 are provided in the frame c in a pressurized contact state.

The paper fixed by the fixing device 70 is delivered to the output roll pair 2.
2 and is discharged to the paper discharge tray 23, and the copy is completed.

Next, a drive mechanism for conveying paper will be described with reference to FIG. 2.

In FIG. 2, 18 ₁ is a register roll drive shaft, 17 ₁ is a slip roll drive shaft, 32 ₁ , 3
2 ₂ are first and second double feed prevention belt drive shafts equipped with first and second electromagnetic clutches (not shown), 33 ₁ , 3
3 ₂ is the first and second transport roll drive shafts, and 34 is a vacuum transport drive shaft, which is horizontally supported across a pair of side plates a, a of the transport path frame A, and is supported from one side plate a, a. protrudes outward.
The first sprocket wheel ₉₀₁ is connected to the register roll drive shaft 181 via the spring clutch 35, the second sprocket wheel ₉₀₂ is _connected to the slip roll drive shaft 171, and the first and second transport roll drive shafts are connected to the register roll drive shaft ₁₈₁ via the spring clutch 35. 33 ₁ and 33 ₂ have third and fourth sprocket wheels 90 ₃ and 90 ₄ , vacuum transport drive shaft 34 has a fifth sprocket wheel 90 ₅ , and first and second double feed prevention belt shafts. 32 ₁ , 32 ₂ are provided with sixth, seventh, and eighth sprocket wheels 90 ₆ , 90 ₇ , and 90 _{8 , respectively} . 1st chain 91 over ₈
are wound around the third, fourth, fifth, sixth, and seventh sprocket wheels 90 ₃ , 90 ₄ , 90 ₅ , 9
A second chain 92 is wound around 0 ₆ and 90 ₇ .

The second double-feed prevention belt drive shaft ₃₂₂ is connected to a drive source provided in the main body of the copying machine via a meshing clutch 321.
It is interlockingly connected to _M1 .

Also, the rope 3 of the spring clutch 35
51 faces into the hole 37a of the frame 37 of the copying machine main body, and engages with one end 36a of the interposer 36 which is swingably supported on the frame 37, and the other end 36b of the interposer 36 is connected to the cam 3 provided on the frame 37.
8 and the cam 38 is engaged with a drum shaft (not shown).
Chain 37 is attached to sprocket 371 provided in
Sprocket wheel 381 connected via 2
The cam 38 rotates in conjunction with the rotation of the drum shaft, swings the interposer 36, operates the spring clutch 35, drives the register roll pair 18, and rotates the paper as the photosensitive drum 1 rotates. It is fed to the transfer section B at the appropriate timing. Note that the drum shaft is driven by the main drive source _M2 .

Therefore, the power of the driving source M ₁ is transmitted to the dog clutch 3
21 to the second double-feed prevention belt drive shaft ₃₂₂ , and drives each drive shaft via each sprocket wheel 90 and the first and second chains 91 and 92, the first and second feed rolls 13 _1,13
2 , first and second double feed prevention belts 14 ₁ , 14 ₂ ,
The first and second transport rolls 16 ₁ , 16 ₂ and the slip roll pair 17 are driven. At this time, the first and second
Since the double feed prevention belt drive shafts 32 ₁ and 32 ₂ are provided with electromagnetic clutches (not shown), turn on one of the electromagnetic clutches and turn on the other electromagnetic clutch.
By turning it off, one of the feed rolls 13 and double feed prevention belt 14 is driven, the other feed roll 13 and double feed prevention belt 14 are stopped, and the first and second paper feed trays 12 ₁ , 12 ₂ It is possible to selectively feed paper from either one of the paper feed trays 12, and after the paper has been fed to the transport roll 16, the electromagnetic clutch that was turned on is turned off and the double feed prevention belt 14, which had been driven until now, is turned off. With the paper in a free state, the trailing end of the paper being pulled by the transport roll 16 can be sent out without difficulty.

Further, the register roll pair 18 is connected to its drive shaft 18.
₁ is attached to the first sprocket wheel ₉₀₁ via a spring clutch 35, and since the spring clutch 35 is always open, the register roll pair 18 is always stopped to align the leading edge of the paper. Then, the interposer 36 is swung by the cam 38 which is interlocked with the rotation of the drum shaft of the photosensitive drum 1, and is brought into contact with and separated from the lobe 351, thereby bringing the spring clutch 35 into contact and connecting the first sprocket wheel ₉₀₁ and the register. Roll drive shaft 18 ₁
are connected to drive the register roll pair 18. That is, the register roll pair 18 is driven in timing with the rotation of the photosensitive drum 1.

In addition, each sprocket wheel 90 ₁ to 90 ₈
is provided on one side plate a of the conveyance path frame A, and only the second double-feed prevention belt drive shaft ₃₂₂ is connected to the drive source _M1 provided in the main body of the copying machine by an engaging clutch 321.
Since the paper transport path frame A can be driven and controlled by the driving force disconnection mechanism in only one place, the paper transport path frame A can be easily pulled out from the copying machine main body via the guide member 24. Furthermore, it can be easily connected to the drive source _M2 when being pushed into the copying machine body.

Therefore, the operation of moving the transport path frame A in and out of the copying machine main body is easy, and there is no need to set precise positioning accuracy.

Note that the spring clutch 35 provided on the register roll drive shaft ₁₈₁ is connected to the hole 37a of the frame 37.
The robe 351 facing inside is the interposer 36
Since it only engages with one end 36a of the transport path frame A, there is no place that interferes when pulling out the conveyance path frame A, so the pulling out operation is not made difficult.

Further, only the first and second paper feed trays 12 ₁ and 12 ₂ can be pulled out of the copying machine main body via the pull-out guide member 60, which is convenient when replenishing paper.

Next, the first and second locking mechanisms for locking the first and second paper feed trays 12 ₁ and 12 ₂ to the transport path frame A so that they cannot be pulled out will be described. Note that the first and second lock mechanisms have the same configuration, so the first
Only the locking mechanism will be explained.

A lever 39 is provided on the drawer side 12 ₁ ′ of the first paper feed tray 12 ₁ via a shaft 40 , and the shaft 40 passes through the lower part of the first paper feed tray 12 ₁ and reaches the opposite side 12 ₁ ″, forming a V-shape. The molding arm 41 is fixed so as to rotate according to the operation of the lever 39. The lever 39 is moved between the locking position and the unlocking position between the V-shaped arm 41 and the bracket 93 of the first paper feed tray ₁₂₁ . A snap action spring 42 is provided for fixing the paper feed tray, and a lock pin 45 is provided on the V-shaped arm 41 for locking a lever 44 for raising and lowering the bottom plate of the paper feed tray. A lever 47 that engages the lever 44 and the lock pin 45 is integrally provided on the vertical movement shaft 46 of the bottom plate of the paper base, and the lever 44 is always urged by a spring 48 in the direction in which the bottom plate moves upward. A rod 50 is pivotally attached to the lever 44, and the rod 50 engages with a lock pawl 51 provided on the opposite side 12 _{1 ″} of the first paper feed table 12 1 . It engages and disengages from a claw 52 provided on the side plate a.

When the lever 39 is set to the lock position, the lock pin 45 moves away from the lever 47, and the lever 44 urges the bottom plate upward with the spring 48.
2. Therefore, the first paper feed tray 12 ₁
The top paper of the stacked papers in the first feed roller 13 ₁
The first paper feed table ₁₂₁ is in contact with the transport path frame A.
The drawer is locked by a locking pawl 51 and a pawl 52.

When the lever 39 is placed in the unlocked position (clockwise in FIG. 3), the V-shaped arm 41 rotates counterclockwise in FIG. The levers 47 and 44 are rotated counterclockwise against this. For this purpose, the bottom plate is lowered to separate the topmost paper of the stack from the first feed roller ₁₃₁ , and the lock pawl 51 swings through the rod 50 and separates from the pawl 52. Therefore, only the first paper feed tray ₁₂₁ can be pulled out from the conveyance path frame A via the pull-out guide member 60.

Next, a description will be given of a locking mechanism that locks the transport path frame A to the main body of the copying machine so that it cannot be pulled out. In FIG. 3, 25 is a lever provided on the side plate a in the pull-out direction via a shaft 251;
is provided with a butterfly-shaped cam 26, and the butterfly-shaped cam 26 and lever 25 rotate together. The shaft 251
penetrates the conveyance path frame A and protrudes outward from the opposite side plate a, and a lock plate 28 is fixed thereto;
The lock plate 28 is capable of engaging with and detaching from a fixed frame 29 fixed to the main body of the copying machine. The butterfly-shaped cam 26 is connected to the first and second driven roll shafts 33 of the first and second transport roll pairs 16 ₁ and 16 ₂ .
₁ ′, 33 ₂ ′, the first and second cam surfaces 26a,
26b is cut so that when the butterfly-shaped cam 26 is rotated, the first and second driven roll shafts 33 ₁ ′ and 33 ₂ ′ can be moved.

When the lever 25 is rotated counterclockwise in FIG. 3, the lock plate 28 rotates and separates from the fixed plate 29, allowing the transport path frame A to be pulled out along the guide member 24, and The mold cam 26 rotates and the cam surface 26
a, 26b are the first and second driven roll shafts 33 ₁ ', 3
3 ₂ ' is pushed upward to move the driven rolls of the first and second transport roll pairs 16 ₁ and 16 ₂ against a spring (not shown) to release the nip. For this reason, when a paper jam occurs in the first and second transport roll pairs 16 ₁ and 16 ₂ , the paper can be easily removed.

Note that the upper cover plate c of the conveyance path frame A is attached to the shaft 31.
1, and is biased in the closing direction by a spring 312, making the paper jam removal operation even easier.

In FIG. 2, 53 is the strip puff finger 7.
This is a solenoid for moving the photosensitive drum 1 toward and away from the surface of the photosensitive drum 1 in accordance with the timing when the leading edge of the paper arrives.

Further, although the fixing device 70 is configured to be pulled out via the pull-out guide member 80, it may be pulled out together with the conveyance path frame A. In this case, in order to facilitate drive control, it is more convenient if only the fixing device is driven by a separate motor, since only the power supply connector needs to be connected and separated.

As described above, the copying machine according to the present invention includes a pair of substantially U-shaped side plates a, which are provided facing each other with a predetermined distance therebetween, along the longitudinal direction of the side plates a. A paper transport path frame A is constructed by sequentially constructing a paper transport path including a feed roller, a register roll, a transport, etc., and a paper transport path in series, and the transport path frame A is installed along a guide rail provided on the main body of the copying machine. The drive shaft of the paper conveying tool in the conveyance path frame A is connected to the conveyance path frame A so that it can be pulled out and pushed in from the copying machine main body.
The two drive shafts protrude outward from one side plate a and are drivingly connected to each other via a power transmission mechanism, and one of the drive shafts is connected to a drive source provided in the main body of the copying machine through a detachable clutch. , a conveyance path frame in which the paper conveyance device and the paper conveyance path are constructed in series by disengaging the clutch between the drive source provided in the copying machine body and one of the drive shafts of the paper conveyance device in the conveyance path frame A. A can be pulled out of the copying machine main body along the guide rail, making it extremely easy to check for jammed paper and remove jammed paper. The drive shafts protrude outward from the side plates and are drivingly connected to each other via a power transmission mechanism, and one of the drive shafts is connected to a drive source provided in the main body of the copying machine through a detachable clutch. The mechanism is simple, and since the clutch is the only point of contact between the conveyance path frame A and the copying machine body, there is no need to precisely set the positioning accuracy of the conveyance path frame A with respect to the copying machine body. The structure of the indoor rail of the road frame A is simple and inexpensive. In addition, the conveyance path frame A has a pair of substantially U-shaped side plates a, which are provided facing each other with a predetermined interval maintained between them.
Since the paper conveyance device and the paper conveyance path are successively installed in series along the longitudinal direction of the side plate a,
It is integrated and has a rational design arrangement, and can be compactly housed within the main body of the copying machine.

Furthermore, since the paper feed tray is provided on the guide rail provided on the conveyance path frame A, the paper feed tray can be pulled out together with the conveyance path frame A, and the paper feed tray can be moved between the paper feed tray and the paper conveyor or the paper conveyance path. In the case of a jam that causes the paper to stagnate, you can easily remove the paper without damaging it by gradually pulling out the paper feed tray relative to the transport path frame A as necessary, and then retry the paper that was removed. However, paper jams are often caused by poor paper feeding by the feed roller or double feeding, so it is extremely important to be able to easily remove the paper and make it usable again. That's true. In addition, since the paper feed tray is equipped with a lock mechanism as described above, the uppermost paper on the paper feed tray can be separated from the feed roller by lever operation, so the paper feed tray alone can be easily pulled out, and when replenishing paper, the transport path Paper can be easily replenished without having to take the trouble of pulling out the entire frame including frame A.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is an overall front view, FIG. 2 is a perspective view of the main part, and FIG.
FIG. 3 is a perspective view from the opposite side of the figure. A is a side plate, A is a transport path frame A, 12 is a paper feed table, 13 ₁ and 13 ₂ are feed rollers, 18 is a register roll, 19 is a transport, 321 is a clutch, and M ₁ is a drive source.

Claims (1)

[Scope of Claims] 1. Between a pair of substantially U-shaped side plates a, which are provided facing each other with a predetermined interval, a feed roller, a register roll, A paper transport path frame A is constructed by sequentially constructing a paper transport device such as a transport and a paper transport path in series, and the transport path frame A is pulled out from the main body of the copying machine along a guide rail provided on the main body of the copying machine. The conveyance path frame A is provided so that it can be pushed freely.
Each of the drive shafts of the paper conveyance device in the above is connected to each other through a power transmission mechanism by protruding outward from one side plate a of the conveyance path frame A, and one of the drive shafts can be freely engaged and detached. It is connected to a drive source provided in the main body of the copying machine via a clutch, and furthermore, a paper feed table is provided along a guide rail provided in the transport path frame A so that it can be freely pulled out and pushed in from the transport path frame A, and by operating a lever. The paper feed tray is locked to and detached from the conveyance path frame A, and when detached, the bottom plate of the paper feed tray is moved downward to separate the top paper of the stacked papers in the paper feed tray from the feed roller. A copying machine characterized in that a lock mechanism is provided on the paper feed tray.