JPH0756268Y2 - Roller shaft support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a sheet conveying device arranged in a sheet conveying path in an image forming apparatus such as a copying machine or a facsimile, and particularly, a pinch roller using a clip member. The present invention relates to a device that is capable of exhibiting a good nip state with respect to a sheet between the drive roller and the drive roller.

(Prior Art) In an image forming apparatus such as a copying machine or a facsimile, a driving roller and a pinch roller are arranged to face each other in a sheet conveying path, and the sheet is conveyed while nipping the sheet between both rollers. I am trying to make the action of.

In a general sheet conveying device, a pinch roller and a drive roller are supported by supporting means such as a frame or a sheet guide plate via bearing means, and biasing means such as a spring is provided for each shaft. By providing
It is made possible to obtain the nip pressure between both rollers.

On the other hand, in an apparatus in which one of the guide plates forming the paper transport path is openable and closable, there is a means for supporting the shaft of the drive roller on the fixed frame and the openable and closable guide plate. May be used.

The roller supporting means as described above is, for example, an actual open shaft 64.
-43038, etc. The mounting means for the support shaft of the conventional pinch roller is constructed as shown in FIG.

In the pinch roller support system shown in FIG. 8, the pinch roller 1 is rotatably supported on a support shaft 2. E-rings 40, 40 are attached to both sides of the support shaft 2, and spring members are provided outside the E-rings.
41, 41 are arranged so that the end of the spring member is stopped by the stopper 42.
It is designed to be attached to a guide plate or the like via.

Therefore, when the pinch roller is attached to the guide plate, it suffices to simply hook the end of the spring member on the locking means provided on the guide plate. The pressing force applied to the drive roller also utilizes the force of the spring member, so that the nip pressure by the transport roller device can be easily set.

(Problems to be solved by the invention) However, in the conventional shaft fixing means as described above, the constituent members such as springs are relatively small parts, and it is necessary to pay close attention to their handling. There is a problem that the operator's skill is required for assembling.

Further, since the work of attaching the end of the spring member to the guide plate is relatively troublesome, there is a problem in that it requires a lot of maintenance work when the device is inspected and repaired, and the work efficiency cannot be improved. there were.

In addition to this, to target very small parts,
When the work of inserting and removing the E-ring from the support shaft is performed, there are drawbacks that the parts are easily lost, the work of removal is troublesome, and the positioning of the pinch roller is difficult. .

(Object of the Invention) The present invention solves the above-mentioned drawbacks of the conventional device. The pinch roller can be easily mounted, and the positioning of the roller and the setting of the pressing force against the drive roller can be reliably performed. It is intended to provide a means that can be done.

(Means and Actions for Solving Problems) In a roller shaft supporting device of the present invention, a roller member is rotatably supported by a supporting shaft, and an end portion of the supporting shaft is provided with an elastic member with respect to a frame. The present invention relates to a roller device configured to be supported via a roller member and contact the drive roller with a predetermined pressing force.

In the roller shaft supporting device of the present invention, the roller member is attached to the frame by using an attaching member (a substantially U-shaped clip member or the like) that engages with the frame and positions with respect to the drive roller. I have to.

Also, in the device of the present invention, a cutout portion (D cut portion) that engages with a spring is provided at the end portion of the support shaft, an elastic member is arranged between the cutout portion and the frame, and the roller member is provided. It is configured to urge the rollers (driving rollers) facing each other.

As described above, in order to attach the support shaft to the support frame, by using the attachment member (a substantially U-shaped clip member) that engages with the frame and positions with respect to the drive roller, the pinch roller support shaft Installation work can be done with one touch.

Also, a notch (D) that engages with a spring provided at the end of the support shaft.
Since the elastic member is attached to the pinch roller via the (cut) portion, the pinch roller can be accurately positioned and the pressing force against the drive roller can be satisfactorily exerted.

(Example) The structure of the roller shaft supporting device of the present invention will be described with reference to the illustrated example.

In the example shown in FIG. 1, a support shaft 2 to which a pinch roller 1 is attached, and a clip member for the support shaft 2 (an attachment member that engages with a frame and positions the pinch roller shaft with respect to a drive roller) 10 , 10 and the arrangement of the elastic members 5, 5 and the like are shown.

In the embodiment of the present invention shown in FIG. 1, the pinch roller 1 is supported so as to be freely rotatable with respect to the support shaft 2, and both end portions of the support shaft 2 are provided at both ends. ,
Cut portions (notch portions that engage with springs) 3 and 3 are provided, respectively.

Further, clip members 10, 10 are arranged on both sides of the roller in order to mount the support shaft 2 on the support frame.

The clip member 10 is integrally formed of a relatively elastic plastic or the like, has a substantially U-shaped cross section, and has a jaw portion 13 projecting from the tip end portions of the leg members 11 and 12 on both sides. It is provided. Then, the supporting shaft 2 can be attached by inserting the leg member into the hole of the support frame and fixing it through the jaw portion.

Further, biasing means by a leaf spring 5 is arranged for the D-cut portions 3 at both ends of the support shaft 2 so that the leaf spring 5 can perform the positioning operation of the pinch roller device. To do.

As shown in FIG. 2, the leaf spring member 5 has a base portion 6 fixed to the frame 20 and a support portion 7, and the base portion 6 is attached to the frame by means such as screws or adhesion. Then, the D cut portion 3 of the support shaft 2 is engaged with the support portion 7, and the bent portion 7a provided at the tip end portion of the support portion 7 is engaged with the end portion of the D cut portion, thereby Be able to perform positioning.

FIG. 2 shows an example of a case where a pinch roller and a drive roller of the present invention are combined to form a conveying roller device.

In the example shown in FIG. 2, the support shaft 2 of the pinch roller 1 is composed of a clip member 10 and a leaf spring member 5,
Mounted to the frame 20. Also, drive roller 25
The drive shaft 26 is connected to a drive means (not shown) so that a nip pressure of a predetermined value can be obtained between the drive roller 25 and the pinch roller 1.

The paper transport path 21 is set by the upper and lower guide plates 22 and 23, and the pinch roller 1
The drive roller 25 and the drive roller 25 are projected from the holes formed in the respective guide plates toward the paper transport path. Then, by driving the drive roller in a state where the paper is nipped between both rollers, the work of carrying the paper in the paper carrying path can be performed.

The example of the transport roller device shown in FIG. 2 is an example in which the frame for mounting the drive roller is provided so as to be openable and closable with respect to the main body frame. In the case of mounting to each other, each roller is supported contrary to the above-mentioned embodiment.

Next, the order of mounting the pinch roller of the present invention will be described with reference to FIGS. 3 (a) to 3 (c).
First, as shown in FIG. 3 (a), the main body frame 20
On the other hand, the leaf spring members 5 and 5 are attached at predetermined intervals, respectively, and the supporting portions are projected and arranged.

Next, as shown in FIG.
By mounting 10 in the insertion holes of the main body frame and engaging the support portion 7 of the leaf spring member 5 with the D-cut portion of the shaft end portion, the pinch roller can be mounted and positioned. To do.

After the pinch roller is attached as described above, the drive roller 25 is attached corresponding to the pinch roller 1 as shown in FIG.

The drive shaft 26 of the drive roller 25 is connected to the drive belt 27.
To the drive motor 28 via a transmission means to configure the conveyance roller mounting. The transport roller device shown in (c) above is constructed by arranging upper and lower guide plates constituting a paper transport path, as shown in FIG.

The transport roller device as described above can be applied to, for example, the facsimile 30 shown in FIG.

In the facsimile 30 shown in FIG. 4, an image sensor is provided for a document P placed on a document tray 31 via a paper feeding device including a feed belt and a retard roller.
The image sensor 34 is configured to convey the sheets one by one toward the image reading unit configured by the image sensor 34.
Conveyor roller devices are arranged on both sides of.

In the embodiment of the facsimile, the pinch roller 33 of the conveying roller device and the feed belt of the paper feeding device are
It is attached to the body frame. Further, a swing frame 35 is provided on the main body frame via a hinge 37, and drive rollers 36, 36 and a retard roller of a sheet feeding device are arranged on the swing frame 35, respectively.

In the device of the present invention configured as described above, the swing frame 35 is closed to form a paper feeding device by combining the feed belt and the retard roller, and the driving roller 36 is pressed against the pinch roller 33. ,
A transport roller device is configured. Then, by setting each of the sheet conveying members to a state in which the sheet can be conveyed, it is possible to scan the image while conveying the document P in the arrow direction.

As described above, instead of supporting the end portion of the support shaft by the leaf spring member, it is also possible to support the shaft by the coil spring 8 as shown in FIG. In the embodiment shown in FIG. 5, the support shaft 2 is attached to the main body frame by the clip member 10 in the same manner as in each of the above embodiments, but with respect to the D-cut portion 3 of the support shaft 2. The spring member 8 is attached, and the pinch roller 1 can be urged toward the drive roller by the coiled spring member 8.

Further, in the above-described embodiment, the spring member 8 may be attached to the main body frame side by any means such as fixing with a screw.

The clip member 10 used in the above-described embodiment of the present invention may have the structure as shown in FIG. 6 or 7 in addition to the structure shown in FIG.

Clip member shown in FIGS. 6 (a) and 6 (b).
In 10, the two leg members 11, which are configured in a substantially U shape,
A shaft insertion hole 14 is provided between the legs 12, and a locking member 15 is provided so as to project from a side portion of the leg member 11.

Then, the leg member of the clip member is attached to the insertion hole provided in the frame, and the jaw portion 16 of the locking member 15 is engaged and locked with the lower portion of the frame. Further, depending on the mounting position of the pinch roller, the projection 17 provided on the leg member 12 may be locked, but the projection 17 is such that the frame is sandwiched between the projection 17 and the jaw 16. You may make it act.

Apart from the embodiment of FIG. 6, the clip member 10 of the present invention is provided.
Can also be configured as shown in FIGS. 7 (a) and 8b).

In the case of the embodiment of the clip member, the jaw portion 16 of the locking member 15 is arranged on the upper side, but it is set according to the height of the frame to which the clip member is mounted. In FIGS. 6 and 7, (a) is a front view, and (b) is a side view seen from the AA direction and the BB direction of the corresponding drawings.

Also, in the embodiment of the clip member of the present invention shown in FIGS. 6 and 7, the sloped portion 10a formed in a mountain shape on the upper portion of the clip member 10 is a pinch roller supported by the clip member. However, the top portion of the clip member can form the guide means when it is arranged to be exposed to the sheet conveyance path without the intervention of the guide plate.

Therefore, in the case of a device with a relatively short paper transport path,
In particular, it becomes possible to perform the action of a guide for a document without providing a guide plate.

The supporting means of the pinch roller having the above-described structure according to the present invention is not used only when the pinch roller is arranged on the fixed side, as shown in FIGS. It can also be applied when the pinch roller is arranged on the moving frame.

Further, the roller shaft supporting device of the present invention can be applied not only to a facsimile, but also to a sheet conveying path of an image forming apparatus such as a general copying machine or a printer.

(Effect of the Invention) Since the roller shaft supporting device of the present invention has the above-described structure, the transport roller device can be assembled by using the clip member having a relatively simple mechanism. It is possible to shorten the work time required for assembly.

Further, in the shaft supporting device of the present invention, by using the substantially U-shaped clip member for mounting the supporting shaft to the supporting frame, the mounting work of the supporting shaft can be performed with one touch.

Further, the pinch roller can be positioned accurately because it is mounted in a state in which it is biased by the elastic member via the D-cut portion provided at the end of the support shaft, and the pressing force against the drive roller is improved. It will be possible to demonstrate.

[Brief description of drawings]

FIG. 1 is a perspective view of a roller shaft supporting device of the present invention, FIG. 2 is an explanatory view of a conveying roller device, and FIGS. 3 (a) to 3 (c).
FIG. 4 is an explanatory view of the assembling order of the roller shaft supporting device of the present invention, FIG. 4 is an explanatory view of a facsimile to which the present invention is applied, FIG. 5 is an explanatory view of another embodiment of the shaft supporting means, and FIG. 6 (a) is a front view of another embodiment of the clip member of the present invention, FIG. 6 (b) is a side view of the clip member of FIG. 7 (a) in the AA direction, and FIG. 7 (a) is the clip member of the present invention. Front view of another embodiment of
FIG. 8B is a side view taken along line BB of FIG.
The figure is an illustration of a conventional roller shaft support device. Reference numeral 1 in the figure 1 ... Pinch roller, 2 ... Support shaft, 3 ... D cut portion, 5 ... Leaf spring member, 6 ... Base portion, 7 ... Support portion, 8
...... Spring member, 10 …… Clip member, 11 ・ 12 ……
Leg member, 13 ... Jaw part, 14 ... Shaft insertion hole, 15 ... Locking member, 20 ... Main body frame, 21 ... Paper transport path, 22/23 ...
… Guide plate, 25 …… Drive roller, 26 …… Drive shaft, 30 ……
facsimile.

Claims (1)

[Scope of utility model registration request] 1. A roller member is rotatably supported by a support shaft, and an end portion of the support shaft is supported by a frame via an elastic member, and the roller member pushes a predetermined amount against a drive roller. In a roller device configured to come into contact with each other by pressure, a mounting member that engages with a frame and positions with respect to a drive roller is used to mount the shaft of the roller member with respect to the frame, A roller shaft characterized in that a notch portion engaging with a spring is provided at an end portion of a shaft, an elastic member is arranged between the notch portion and a frame, and the roller member is biased toward an opposing roller. Support device.