JPH0540026Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a sheet conveyance guide device, specifically, for example, a sheet conveyance guide device provided with a protrusion that maintains a gap between guide plates forming a sheet conveyance path. Regarding.

[Conventional technology]

Generally, the paper conveyance path in a copying machine or the like is formed by a pair of guide plates A and B facing each other, as shown in FIGS. 13 and 14. , and the amount of protrusion of this protrusion C forms a gap L through which the paper is conveyed.

In addition, bending parts D and E for screwing are provided so as to be attached to the side plate.

[Problem that the invention attempts to solve]

However, since the protrusion C is bent, the protrusion amount L
However, if it is 1 or 2 mm, it will be difficult to bend and the accuracy of L will be poor. Therefore, if it is desired to set the protrusion amount L to 2 mm, for example, it is difficult to obtain the accuracy of L unless the thickness of the sheet metal is 0.8 mm or less.

[Purpose of invention]

The object of this invention is to obtain a sheet conveyance guide device that can form a gap with high accuracy between guide plates without being greatly influenced by the thickness of the guide plates.

〔Example〕

An embodiment of this invention will be described below with reference to the drawings.

<Configuration> The image forming apparatus shown in FIG. 1, for example, a laser print 1, includes a main body 2, a conveyance section 3, and a paper refeeding section 4, and is capable of single-sided printing, double-sided printing, reversed discharge, and straight discharge. be.

The main body 2 includes a mounting opening 6 for the paper feeding cassette 5, a paper feeding roller 7 for feeding out the paper from the paper feeding cassette 5 set in the mounting opening 6, and paper feeding paths 16, 17.
, registration rollers 8 and 9 that adjust the leading edge of the paper fed from the paper feed path 16 or 17, an image forming unit 10 whose specific configuration is omitted, and a sensor 56.
It includes fixing rollers 11 and 12, a switching guide 13, a front/back reversing path 14, a reversing paper ejection tray 15, a connection port 18, and a conveying unit support arm 19.

In addition, the main body 2 is connected to the lower unit 2 as shown in FIG.
0 and an upper unit 21, with a hinge 22
The upper unit 21 is attached to the lower unit 20 so as to be openable and closable.

As shown in FIG.
It is rotatably attached to the paper refeeding section 4 via the paper refeeding section 4, the other end is supported by engaging the roller 23 to the support guide 19 of the main body 2, and it is attached between the conveyance section 3 and the paper refeeding section 4. It is biased by a spring 24 which is attached.

As shown in FIG.
6 includes a rotatable straight paper ejection tray 27, a paper feed path 28, a switchback path 29, a sensor 57, forward/reverse rollers 30, 31, an auxiliary tray 32, and a paper feed path 33. .

The paper refeeding section 4 includes a paper feed path 34 that conveys the paper supplied from the paper feed path 33, and a paper feed path 34 that conveys the paper fed from the paper feed path 33.
aligning rollers 35 and 36 that align the paper supplied to the reference position, and a paper feed path 34.
transport rollers 37 and 38 that transport the paper, a paper feed path 39 that guides the paper sent by these transport rollers 37 and 38 to the paper feed path 17, a mounting opening 40 of the paper feed cassette 5, and a The paper feed roller 41 is provided with a paper feed roller 41 that feeds out the paper, and a paper feed path 42 that guides the paper fed out by the paper feed roller 41 to the paper feed path 17.

By the way, the drive devices for the switching guides 13 and 25 are constructed as shown in FIGS. 3 to 6.

A lever 44 is attached to the rotation shaft 43 of the switching guide 13.
is installed.

An arm 46 is attached to one end of the rotation shaft 45 of the switching guide 25, and a manual switching grip 47 is attached to the other end as shown in FIG. 25 is adapted to rotate up and down.

Note that the rotational position of the switching grip 47 can be detected by a sensor (not shown).
A rotation shaft 48 is provided between the switching guide 13 and the switching guide 25, and the arm 4 is attached to this rotation shaft 48.
9 and 50 are provided at a predetermined angle.

Note that the arm 49 can be engaged with the arm 46, and the arm 50 can be engaged with the tip of the lever 44.

A lever 52 biased by a spring 51 is attached to the base end of the rotation shaft 48, and when the plunger 54 is attracted by the excitation of the solenoid 53, the pin 55
pulls the lever 52 to drive the rotating shaft 48, and when the solenoid 53 is de-energized, the spring 51 returns to its original position.

The paper feeding circuit 33 includes guide plates such as a lower guide 83 and an upper guide 84 as shown in FIGS. 10 to 12.
It is formed by

The guides 83, 84 have screw holes 85,
Bends 87, 88 having 86 are formed. Notches 8 are provided on both sides of the bent portions 87 and 88.
9 and 90 are provided.

Furthermore, protrusions 91 and 92 are formed on the bent portions 87 and 88. Note that 93 in FIG. 10 is a protrusion 92.
This is the hole formed after punching out.

By the way, if the amount of protrusion of the protrusions 91 and 92 is L1, and the length of the bent portions 87 and 88 is L2, then L1<L2.
It is set as.

The paper feed path 34 is formed of a lower guide 58 and two upper guides 59 and 60, as shown in FIGS. 7 and 8.

The lower guide 58 has a horizontal portion 58A and a curved portion 58B, and is supported between side plates 61 and 62 by screws 63, 64, 65, and 66, as shown in FIG.

The upper guide 59 has arms 67 and 68 at one end and a flange 69 at the other end.
7 and 68 are the support members 7 attached to the side plate 61.
It is rotatably supported at 0.71. Further, a stopper 72 is provided on the flange 69.
Furthermore, a protrusion 75 that protrudes toward the upper guide 60 is provided. Furthermore, an aligning roller 35 is attached to the arm 67.

The upper guide 60 is curved along the curved portion 58B, and the support plates 7 provided at both ends of the lower guide 58
3, 74, and is rotatably supported by a shaft 74'. Further, a conveyance roller 37 is attached to the upper guide 60.

Further, the upper guide 60 is provided with an overlapping portion 76 that covers the protrusion 75. Also spring 8
0, it is biased toward the curved portion 58B.

A lever 7 that rotates around a shaft 77 is mounted on the side plate 62.
8 is installed. This lever 78 is provided with an arm 79, and when the lever 78 rotates, the arm 79 engages with the flange 69 and moves the upper guide 59 up and down.

<Operation> (1) During reverse ejection Rotate the switching grip 47 counterclockwise to lock the switching guide 25 in the position shown in FIG. 3. In this state, arms 46 and 49 are not engaged. Further, the solenoid 53 is also not excited. Therefore, the arm 50 does not rotate, and the switching guide 13 also does not rotate.

Therefore, the paper fed from the paper cassette 5 and printed by the image forming section 10 is transferred to the switching guide 13.
The sheet is guided to the front-back reversing path 14 and stored in the reversing sheet discharge tray 15.

(2) During double-sided printing When the sensor 56 detects the leading edge of a sheet of paper printed on one side in the image forming section 10 in the state shown in FIG. 3, the solenoid 53 is energized. As a result, the plunger 54 is attracted, the pin 55 is lowered, the lever 52 is rotated counterclockwise, and the rotation shaft 48
rotates. Therefore, as shown in Fig. 4, the arm 50
rotates upward, pushes up the lever 44, and rotates the switching guide 13 counterclockwise. As a result, the front/back reversal path 14 is blocked.

Therefore, the paper printed on one side is guided to the lower surface of the switching guides 13 and 25 and is supplied to the paper feed path 28. When the leading edge of the paper is detected by the sensor 57, the forward/reverse roller 31 is driven counterclockwise to convey the paper to the auxiliary tray 32 side.

By the way, when the trailing edge of the paper passes the sensor 56, the excitation of the solenoid 53 is released after a predetermined period of time, and the switching guide 13 returns to the state shown in FIG. 3.

When the trailing edge of the paper passes the sensor 57, the forward/reverse rotation roller 31 is driven clockwise. Therefore, the conveyance direction of the paper is reversed and the paper is supplied to the paper feed path 33. This sheet is conveyed by aligning rollers 35 and 36 to the aligning reference.

When the rear end of the switched paper passes the sensor 57, the forward/reverse rotation roller 31 stops.

The paper aligned in the paper feed path 34 is sent to the paper feed paths 39, 17 by conveyance rollers 37, 38, and is printed on the blank side by the image forming section 10.

Therefore, printing has been performed on both sides of the paper, and this paper is fed to the front-back reversing path 14 by the switching guide 13, which is in the state shown in FIG.
The paper is discharged onto the reverse paper discharge tray 15.

(3) Straight discharge When printing on paper that is difficult to bend, such as thick paper, rotate the switching grip 47 clockwise. As a result, the switching guide 25 changes from the state shown in FIG.
Descend to the state shown in the figure. Also, arm 46 is arm 49
Press to rotate the arm 50 upward. Therefore,
The lever 44 is pushed by the arm 50, and the switching guide 13 rotates counterclockwise, resulting in the state shown in FIG. 5.

If printing is performed in such a state, the paper printed by the image forming unit 10 will not be transferred to the switching guide 1.
3 and the upper surface of the switching guide 25 and are discharged to the straight paper discharge tray 27. The rear end of the ejected paper is supported by the communication port 18.

(4) Clearing a paper jam If a sheet is jammed in the paper feed path 34, turn the lever 78 counterclockwise in the state shown in FIG. 7. Therefore, the tip of the arm 79 comes into contact with the flange 69, and the upper guide 59 moves upward with the flange 69 side centered around the support members 70 and 71 side.

At the same time, the protrusion 75 pushes up the overlapping portion 76 of the upper guide 60, and the upper guide 60 pushes up the support plates 73, 7.
It rises centering on the 4th side.

Then, the arm 79 is moved to the stopper 7 as shown in FIG.
2, the lower guide 58 and upper guide 5
9 and 60 is the fully open state.

In this state, as shown in FIG. 8, the pressure contact between the conveyance rollers 37 and 38 is released. The jam paper can be pulled out towards the front.

When the removal of the jammed paper is completed, the lever 78 is turned clockwise to lower the upper guide 59. As a result, there is nothing to raise the upper guide 60, and the upper guide 60 also descends due to the weight of the upper guide 59 and the return force of the spring 80.

When the lever 78 is set to its original position, the seventh
As shown in the figure, the upper guides 59 and 60 together with the lower guide 58 form the paper feed path 34.

<Advantages of the embodiment> (1) Since the protrusions 91, 92 and the bent parts 87, 88 are integrated and the length L2 of the bent parts 87, 88 is made larger than the protrusion amount L1 of the protrusions 91, 92, the protrusion amount can be reduced. The accuracy of L1 depends on the length L2 of the bent portions 87, 88, and even if the amount of protrusion L1 is small, the amount of protrusion L can be reduced by making the length L2 of the bent portions 87, 88 longer than the length that can maintain accuracy.
1 can be processed with high precision. Therefore, the gap between the paper feed paths 33 can be made constant regardless of the thickness of the sheet metal.

(2) Since the bent portions 87 and 88 are larger than the projections 91 and 92, screw holes 85 and 86 for mounting can be provided, and there is no need to provide the bent portion D and the projection C separately as shown in Fig. 14. Therefore, it is easy to process and there are fewer protrusions.

[Modified example]

One embodiment of this invention has been explained above,
This invention is not limited to the above-mentioned embodiment, and for example, the following modifications are possible.

(1) In the embodiment described above, both guides 83 and 84 were provided with bent portions 87 and 88 and projections 91 and 92, but only one guide was provided with bent portions and projections to form a gap between the guides. Also good.

[Effect of idea]

Since this invention is as described above, it is possible to obtain a sheet conveyance guide device that can form a highly accurate gap between guide plates without being greatly influenced by the thickness of the guide plates.

[Brief explanation of the drawing]

Figures 1 to 12 are diagrams showing an embodiment of this invention, with Figures 1 and 2 showing the overall configuration of the laser printer, and Figures 3 to 6 showing the switching guide and drive device. 7 to 9 are diagrams showing the paper jam release mechanism of the paper refeeding section. Figures 10 to 12 are diagrams showing the configuration and usage state for forming the guide gap. 13 and 14 are diagrams for explaining the prior art. 1... Laser printer, 2... Main body, 3... Conveying section, 4... Paper refeeding section, 83... Lower guide, 84
...Top guide, 87, 88...Bending portion, 91, 9
2... protrusion, 85, 86... hole.

Claims (1)

[Claims for Utility Model Registration] (1) In a sheet conveyance guide device in which a sheet conveyance path is formed by a pair of opposing guide plates, a projection protruding inward in the width direction is provided at the widthwise end of the guide plate; A bent portion is provided that is connected to the protrusion and protrudes outward in the width direction from the widthwise end, and has a larger protrusion amount than the protrusion, and the bent portion is bent based on the widthwise end to cause the protrusion to protrude from the guide surface. The sheet conveying guide device is characterized in that the protrusion forms a gap between the pair of guide plates. (2) The sheet conveyance guide device according to claim 1, wherein the bent portion is provided with a hole for fixing a screw.