JPS60252545A - Sheet conveying device - Google Patents

Abstract

PURPOSE:To prevent a pressing force applied to a belt unit from being applied to a driving roller bearing as a radial load and reduce the load torque to a driving roller by elastically pressing the projection of a belt unit supporting member placed on a receiving part, by means of a retainer member. CONSTITUTION:Retainer members 54, 54a in a positioning device 51, 51a are merely presses vertically from the upper part with an elastic force, against receiving parts 53, 53a which are provided on the side plate 12 of a supporting body 11 for a projection 52 fixed to a belt-unit 50 driving side supporting members 15, 15a. Therefore, moment is not generated in the supporting members 15, 15a due to the pressing force. Accordingly, any force based on such moment is not applied to bearings 14, 14a for driving rollers 2, reducing a frictional force and, in its turn, load torque, between the supporting shaft 2a of the driving roller 2 and shaft supporting parts 114, 114a.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a drive roller rotated by a drive device, at least one driven roller, a belt wound around these rollers, and a support member for the drive roller and the driven roller. The present invention relates to a sheet conveyance device having a bell unit 1 and a support body that rotatably supports the support shaft of the drive roller through a bearing and supports the support member of the belt unit through a positioning device.

Conventionally, the sheet conveying device of the above type has been used to convey sheets such as copy paper, recording paper, manuscripts, or printing in image forming devices such as electronic copying machines, printers, and other various devices. It is more well known. In this type of conveying device, the belt unit is usually detachably supported by a support, and the belt unit 1 is positioned and supported by the support by the positioning device described above.

In this case, the conventional positioning device consists of a screw that fixes the support member and the support member on the side of the bell 1 to the unit. By tightening this screw, the support member is firmly fixed and positioned on the support side, and the screw is fixed. The belt unit 1- can be removed from the support by loosening it (see, for example, Japanese Patent Application No. 59-248838). However, since the screws had to be tightened and loosened each time the belt unit was attached or detached, this attachment and detachment work was very troublesome. In addition, when the belt unit is set on the support and the screws are tightened, this force is transmitted to the drive roller via the support member, and the support shaft of the roller is strongly pressed against its bearing, so the support of the drive roller is As a result of the increased frictional force acting between the shaft and the bearing and the increased load torque, it is necessary to increase the drive I-lug that rotates the drive roller, which inevitably increases the load on the drive device. Ta.

Furthermore, it cannot be ignored that the bearing may wear out prematurely as the frictional force increases.

The present invention has been made based on the above-mentioned recognition, and its object is to reduce the load of the driving roller from 1 to 100 mph compared to the conventional It is an object of the present invention to provide a sheet conveying device which avoids the disadvantages described above and can simplify the operation of attaching and detaching a bell 1 to a unit to a support body than before.

The present invention can be applied to sheet conveyance devices used in various types of devices, and below, as an example, an embodiment applied to a sheet conveyance device in a two-color copying machine will be described with reference to the drawings, and the above-mentioned embodiments will also be described. The drawbacks of the conventional technology will be explained in more detail with reference to the drawings.

FIG. 1 shows a belt unit 50 of a sheet conveying device 1 according to the present invention installed in the main body of a copying machine, and various elements for the copying machine arranged around the belt unit 50.

In addition to the bell l-unit 50, the sea 1 to the transport device 1 have a support body 11 (FIG. 4) that supports the unit, and the structure of the support body will be explained later. The overall configuration of the figure will be explained together with its operation.

The belt unit 50 includes a driving roller 2, a driven roller 3, and a bell 1-4 wound around these.
The bell 1 to 4 is rotated in the direction indicated by the arrow by the rotation of the drive roller 2. Copy paper 10 transferred from the right side of the figure from a paper feeding device (not shown) to belt unit 50 is electrostatically attracted to bells 1 to 4 that are charged in advance by electrostatic charger 5, and is conveyed in the direction indicated by the arrow. be done. The copy paper 10 is
When it reaches the first photosensitive drum 100 rotating clockwise,
A first color visible image formed on the surface of the drum 100 by an image forming means (not shown) is transferred onto the copy paper 10 by the action of the transfer charger 6.

Thereafter, the copy paper IO is carried by the belt 4 and further transferred to the left, and the charge is removed by the action of the paper separation charger 7, the electrostatic attraction force with the belt 4 is weakened, and the copy paper IO is transferred to the left of the driven roller 3. The bell l is removed by the peeling claw 27 disposed on the
- separated from 4. The second one located to the left of the peeling claw 27
The copy paper 10 that has reached the photosensitive drum 101 has a visible image of the second color transferred thereto, and is sent out of the machine via a fixing device (not shown).After the copy paper has been peeled off, the belt 4 is After being deflected by the driven roller 3, the belt is neutralized by the neutralizing charger 9, and then the 1-ner adhering to the belt is removed by a cleaning device (not shown), reaches the charging charger 5 again, and the above-described operation is repeated.

The outline of the copying operation is as described above, but in the illustrated sheet conveying device used for this, there is a need for replacing or cleaning the bells 1 to 4, and the bells 1 to 4 are replaced by both rollers 2 and 4.
3, and for better understanding of the present invention, the related configuration will be described below.

The bell 1-unit 50 is formed into a unit 1 in which each of its elements is integrally assembled, and this unit 50 is attached to the support 1.
1, it is detachably supported in the manner described below. The support body 11 is supported by the copying machine main body via a rail (not shown), and is guided by the rail in the direction of arrow X (FIG. 2).
The fourth
A base plate 111 and two side plates 1.2.12 as clearly shown in the figure.
It has a.

As clearly shown in FIGS. 2 to 4, the Hell I-2 Nit 1-50 includes the drive roller 2 in addition to the drive roller 2, the driven roller 3, and the belt 4 wound around these. Pair of drive-side support members for rotatably supporting], 5,
1.5a and similarly driven side support members 17°1, 7a for rotatably supporting the driven roller 3. In this example, these support members 1.5, 1.5a, 1.7.17a
is made of board material.

The support shaft 2a that fixedly supports the drive roller 2 is connected to the drive side bearing 1.
6, 1.6a, drive side support member 15° 1, 5
They are each rotatably supported by a.

A drive roller 2 is provided at the end of the driven side support member 17, 1.7a.
A substantially U-shaped notch 35° 35a extending along the direction of arrow B (FIG. 3) connecting the center of the driven roller 3 and the center of the driven roller 3 is formed. Bearings 20.20a are fitted to be slidable in the B direction.

A sliding pin 18 and an operating pin 19 are provided on the driven side support member 17 and protrude side by side in the B direction, and the driving side support member 15
Elongated holes 2B and 29 extending in the B direction are formed at positions corresponding to the pins 18 and 19, and the pins 8 and 19 are slidably fitted into these elongated holes, respectively. Also, one end of each long hole 28°29 has a lock groove 1 projecting downward.
28°] 29 is formed.

A compression spring 22 is disposed between the end of the drive-side support member 15 and the driven-side bearing 20, and its elastic return force urges the driven roller 3 in a direction C away from the drive roller 2. . Further, a wire-shaped connecting member 33 is wound around the driven side bearing 20 and the sliding pin 18.

Each of the above-mentioned elements 18. +9°28.29,
Pins 18a and 19a configured exactly the same as 22 and 33
, elongated holes 28a and 29a, a compression spring 22a, and a connecting member 33a. Further, the surface drive side support members 15 and 158 are connected to the transfer charger 6 shown in FIG.
and a casing 2 of the static elimination charger 9 integrally formed.
5゜125, driven side support member 17゜1
7a is also connected by a ground plate 24 for the paper separation charger 7 shown in FIG.

The support section for supporting the rollers of the belt unit 50, in this example the drive side support member 15.15a, is supported by the support body 11 via the positioning device 5 and 51a according to the present invention. On both side plates 12.12a of the body 11,
As clearly shown in FIG. 4, a bearing 14.14a is fixedly provided, and the support shaft 2a of the seven drive rollers 2 is rotatably supported on the shaft support portion 114, ]4a. shaft support part 114,
114a Ljl, it opens diagonally in three directions at an angle of 45 degrees. Positioning device 52.52a
The structure of this will be discussed later in Meiji J. A gear 32 is fixed to the support shaft 2a, and this gear meshes with a drive gear 60 rotatably supported on the side plate 12a of the support 11, and the gear 60 is rotated by a drive device (motor) not shown. As a result, the drive roller 2 is rotated counterclockwise in FIG. 1, and the belt 4 is driven in the direction of the arrow as described above.

The above-mentioned peeling claw 27 attached to the belt unit 50 is rotatably supported by the shaft 26, and at this time, one end is attached to the shaft 26.
3, the peeling pawl 27 is given a rotational habit clockwise (arrow Y) in FIG. The leading end is pressed against the belt 4. Also, at each end of the shaft 26 there is a support piece 2].

21a are fixed respectively, and their engagement grooves 121゜12]
The shaft 26 and the peeling claw 27 are supported by the belt unit 50 by engaging the driven side bearings 20 and 20a, respectively.

As shown in FIGS. 1 to 3, the belt 4 is connected to both rollers 2,
3, the already mentioned compression spring 22.2
2a presses the driven roller 3 in the direction away from the driven roller 2, so the bells 1 to 4 are wound around the rollers 2 and 3 in a tensioned state, allowing the functions of the bells 1 to 4 to be carried out without any trouble. can be accomplished.

When replacing belt 4, remove support +1 from the copier main body.
At the same time, the bell 1 unit 50 is pulled out in the direction of arrow X, and the unit 50k is removed from the bell 1 and the support 11 as shown in FIG. This withdrawal method will also be explained later. Then the support pieces 21.2+,' fixed to the shaft 26
By elastically deforming the tip end of a in the direction of arrow 2 (FIG. 4), the engagement grooves 12], 12] and a are expanded, and the support pieces 21, 21a are disengaged from the driven side bearing 20.20a. , remove the component 21゜2 ] a, 26.30 related to the peeling claw 27 from the belt unit l-50.

Subsequently, the operating bin 19.19a is moved toward the center in FIG. At this time, the driven side bearing 20° 20a is inserted into the notch "5+" of the driven side support member 17, 1.7a as described above.
353 and compression springs 22, 22
Since the bearing 20 is biased in the direction of arrow C by
, 20a and the driven roller 3 are connected to the driven side support member 1.7,
Even if 1.7a moves, it tries to stay in its original position,
By means of the connecting member 33° 33a, the sliding bin 1.8.18
Since the bearings 20 and 20a are connected to the driven side bearings 20 and 20a, the bearings 20 and 20a support the driven side support member 1 together with the driven roller 3.
7° Follows 17a and moves in the direction of the arrow. And the operation pin 19.19a and the sliding bin 18, 1.8a,
Lock grooves 129, 1 of elongated holes 29, 28. 29a, 28a
．． 28; When dropped into 129a and 128a, these bottles are locked in the lock grooves by the elasticity of the spring 22. Thus, as shown by the chain line in FIG. 3, the driven roller 3 approaches the drive roller 2 and the drive side support member 15.15a together with the driven side support members 17 and 178, and at this time, the relationship between the driven roller 3 and the drive roller 2 increases. Since the distance between the axes is reduced, bell 1 to 4 becomes slack, and therefore both rollers 2. : Belt 4 can be easily removed from 3.

After the belt is hooked around both rollers 2 and 3 again, the sliding pin and the operating pin are engaged and disengaged from the lock grooves in the elongated holes. and return to the original position. Thereafter, the conveying device 1 can be housed in the copying machine main body by the reverse procedure to the above-described procedure.

As you can see from the above, Bell 1-Unit 50
For example, bearings 14.14a and positioning devices 51, 5
] It is removably supported by the support body 11 via 71, and the details of the structure and operation thereof will be explained next.

As is clear from FIGS. 2 to 4, the positioning device 51 includes a protrusion 52 fixed to the drive side support member 15 of the unit 50 to the bell 1, and a protrusion provided on the side plate 12 of the support body 11. It has a receiving part 53 for support and a pressing member 54 fixed to the receiving lobe part 53. In the illustrated example, the protrusion 52 is constituted by a bottle, and the receiver portion 53 is formed by cutting and raising the side plate 12 itself, but it goes without saying that these may be constituted in other forms. Further, the holding member 54 is constituted by a leaf spring made of, for example, spring steel, and the protrusion 52 is inserted between the holding member 54 and the flat surface of the receiving portion 53, and is held down by the elastic force of the holding member 54. The other positioning device 5]a also has a receiving portion 5 in exactly the same way.
3a, the protrusion 52a and the holding member 54. Consists of a,
The central axes @F of both the illustrated projections 52 + 52 a coincide with each other. 5 In this way, the bell 1 to unit 1-5
0 is the positioning device 51, 5]a and the bearing 14. ], 4
It is positioned at a predetermined position and supported by the support body 11 via a.

As explained above, attach Bell 1-Units 1 to 50 to Support 1.
1, attach the support shaft 2a of the drive roller 2 to the bearing 14. ．． While pulling out along the shaft support parts 11.4, 114a of the positioning devices 51, 51a in the direction of the arrow G (FIG. 5), the protrusions 52, 52a of the positioning devices 51, 51a are pulled in the direction of the arrow H (also shown in FIG. 5), Pressing member 54.54a and receiving part 5
3. Just pull out the protrusion from the gap between it and 53a. Since the shaft support portion 114° 114a is opened in an inclined state toward the positioning device, the support shaft 2a can be freely extracted from there. By performing the reverse operation, the belt unit 50 can be attached. At this time, since the holding members 54, 54a made of an elastic material can be elastically deformed in the direction shown by the arrow (■) in FIG. 5, it is possible to easily attach and detach the belt unit 5o.

As mentioned above, according to the configuration of the illustrated positioning devices 5], 5]a, there is no need to perform work such as tightening or loosening the screws when attaching or detaching the bells 1 to 1 to units I to 50. -] Simple 1) 1.・Figure 6 shows the tongue piece 55 protruding from the support member 15 on the bell 1 unit side and the support member 11.
An example of a conventional positioning device consisting of a flock 56 fixed to the side and a screw 57 fixing these is shown.
When attaching and detaching the bell units 1 to 50, the screws 57 must be tightened or loosened each time, and this operation is very complicated.

In addition, as explained earlier, set the unit 1-50 on the support 11, and tighten the screw 57 to the screw 6 of the block 56 to fix the unit 1- to the bell 1. At this time, a moment acts on the support member 15 as shown by the arrow j in FIG. , a shaft support portion 114 that supports the support shaft 2a.
, 114a, in addition to the force due to the weight of the bell 1 to unit I to 50 and the force received from the drive gear 60, the screw 57 is tightened.
A force K acts on the support shaft 2a and the support portion 11.
4. ]I4a increases, the drive 1 herk that rotates the drive roller 2 increases, and the load on the drive JIJ device increases.6 Also, due to the friction force
The support shaft 2a and the shaft support portion 11.4. ]+1a also has the disadvantage of premature wear, as explained in section 7 above.

However, the positioning device 51 shown in FIGS. 2 to 5.
, 51. In a, since the pressing members 54, 548 only press the protrusion 52.52a from above with elastic force in the vertical direction, this pressing force causes the supporting member 1
．． 5. There is virtually no moment generated at 15a, and the force l< based on the moment +6 does not act on the bearing 14°L4a, and the support shaft 2a and the shaft support part 114,1
+4a and, as a result, the load torque is reduced compared to the case shown in FIG. In this way, it becomes possible to reduce the drive torque required to rotate the drive roller 2a, and the support shaft 2a and bearing 1. /1,14. It is possible to reduce the wear of a. .

Does the Bell 1-Unit 1-50 supported by the support 11 vibrate from the outside? Even if it is hit by $, the protrusions 52 and 528 will remain l
Press the presser member 54°5 until it does not bend.
It is necessary to make the pressing force by 4a strong, but even if the pressing force is strong like this, this force will cause the bearing 14°1, 4a
Therefore, there is no need to increase the drive torque of the drive roller 2 as in the conventional case.

In addition, when actually configuring the sea 1-conveying device, it is advantageous to take the following points into consideration. In other words, the bearings 1/I and 14a should not receive the force due to the weight of the belt units 1 to 50 as much as possible, and the support shaft 2a should be
- Pivot support lower part 114. +j between I4a! j' 4? 3. It is desirable to lower the X force and reduce the 1% dynamic torque of the drive roller 2. 5. Therefore, when the weight W of Bell 1-Units 1 to 50 acts on the position shown in FIG. 5, the distance between the protrusion 52. The distance between this point of action and the support shaft 2a is made as small as possible than the distance d-42, and most of the own weight W is supported by the receiving parts 53, 538, and the bearings 14, 1.4. It is advantageous to reduce the force due to self-weight acting on a. In addition, each bearing 1.4, 1. The horns that act on /Ia are shown in Figure 4 as L knee W ], , W
2, the component force in the gear radial direction of the external force applied to the gear 32 by the drive gear 60 is applied to each bearing 14. +4. The forces exerted on l are respectively Fl and F2 (Fig. 4 and Fig. 51)
Then, the resultant force of the forces F2 and W2 acting on the bearing 14a on the side where the gear 32 is installed is larger than the resultant force of the forces F1 and Wl acting on the other bearing 4. This is a natural result of the presence of the gear 32 on the bearing 14a side, but since a large load acts on the bearing 14a in this way, the bearing 14a on the gear side is designed to withstand a larger load than the bearing 14. It is desirable to consist of quality. Also bearing 1
．． 4.Cad 1 applied to 14a. F2 has 1 gear 32
．． 60 in the radial direction, but these forces are transferred to each bearing 1
4. +48 can be reliably received, the line segment Q connecting the centers ○ and Q of both gears 32.60 as shown in Fig. Direction G
and the force F1. It is necessary to ensure that F2 can be reliably received, for example, by the shaft support designated by the reference numeral 214 in FIG. The angle σ between the line segment Q and the direction G is 90
For example, the force Fl.

(2) If the force 2 acts in the direction of arrow F', each bearing will not be able to receive this force. Further, as shown in FIG. 6, the bearing 14. Force K acts on +4a, and roller 2
As the load torque increases and the driving torque is increased to cope with this increase, the forces Fl and F2, and hence the reaction force thereof, also increase, and the frictional force acting between the support shaft and the bearing becomes increasingly large. From this, it can be clearly understood that if the negative 411 torque of the drive roller is reduced according to the present invention, wear of bearings, etc. can be effectively reduced.

Hereinafter, an example is shown in which the present invention is applied to a belt unit in which supporting members for supporting a driving roller and a driven roller are configured separately so that belt 1 can be easily replaced. The present invention can also be applied when the roller is made up of one member, and the same applies when there is a plurality of driven rollers. It is also clear that the support can also be constructed in any suitable form other than that shown.

According to the present invention, the positioning device includes a protrusion protruding from a support member of a belt unit, a receiving portion for supporting the protrusion provided on the support, and a protrusion placed on the receiving portion. Since it is equipped with a pressing member that elastically presses down the bell 1 to unit 1, the pressing force applied by the positioning device to the bell 1 to unit 1 does not act on the drive roller bearing as a radial load, and therefore the load on the drive roller is reduced. Torque can be reduced compared to conventional models. Furthermore, it is possible to simplify the operation of attaching and detaching the belt unit.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a part of a copying machine equipped with a sheet conveying device according to the present invention, and FIG. 2 is a plan view of the conveying device, with a part of the bell l~ cut away. FIG. 3 is a sectional view taken along the line ■-■ in FIG. 2, with the support body omitted, and FIG. A perspective view showing the state separated from each other and omitting the bell h, FIG. 5 is the sea 1-vQ
FIG. 6 is an explanatory diagram schematically showing only a part of the conveyance device, and is an explanatory diagram similar to FIG. 5 showing the conventional sea 1 to conveyance device. 1 Sea 1 - Conveyance device 2 - Drive roller 2a... Support shaft 3... Followed roller 4 - Bell l~ 11... Support body 15.15a... Support member 50.50a... Bell 1 - Unit 1 ~ 5], 51a...Positioning device 52+ 52a Projection 53+ 53a Receiving portion 5'+ 5/la - Holding member Fig. 1 (Fig. 3).

Claims (1)

[Claims] At least one drive roller rotated by a drive device.
two driven rollers, the heel h wound around these rollers
, a belt unit having a support member for the drive roller and the driven roller, rotatably supporting the support shaft of the drive roller via a bearing, and supporting the support members of the belt unit 1 through a positioning device. In the sheet conveyance device having a support body, the positioning device includes a protrusion protruding from the support member of the belt unit, a receiving portion for supporting the protrusion provided on the support body, and the positioning device includes a protrusion provided on the support member, the receiving portion being placed on the portion. The sheet conveying device further comprises: a pressing member for bonyly pressing the pressed projections.