JPH0512434U - Paper feeder - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent skewing of the paper in the paper feeder. [Structure] A drive roller 4 and a driven roller 5 are provided so as to abut on a frame 3 with a passage 2 for a sheet P interposed therebetween, and the driven roller 5 is divided at a central portion to form a central shaft 5b. Further, the frame body 3 is provided with a leaf spring 7 for pressing the central shaft 5b.
As a result, when the paper P is fed between the drive roller 4 and the driven roller 5, the drive roller 4 is rotationally driven, and the leaf spring 7 presses only the central shaft 5b to rotate the driven roller 5 as well. Since the sheet P is conveyed by the above-described method, the pressing force of the leaf spring 7 becomes constant, and the sheet P can be prevented from skewing.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a paper feeding device installed in a facsimile machine or the like.

[0002]

[Prior Art]

 2. Description of the Related Art Conventionally, as a paper feeding device equipped in a facsimile machine, there is a paper feeding device as shown in FIGS. In this paper feeding device, the drive roller 20 is rotatably supported by the frame body 21. Further, a driven roller 22 is arranged above the drive roller 20 so as to be in contact therewith, and a support shaft 22a of the driven roller 22 is supported by a pair of support pieces 23 protruding from the frame body 21 to rotate. It is possible. Further, both sides of the support shaft 22a are pressed against the drive roller 20 side by a pair of spring pieces 24a of a leaf spring 24 attached to the frame 21. When the paper is fed between the drive roller 20 and the driven roller 22, the drive roller 20 is rotated by the drive of the motor 25 via the gears 26 and 27, and the driven roller 22 is also rotated to convey the paper. It is like this.

[0003]

[Problems to be solved by the device]

 However, since both sides of the support shaft 22a of the driven roller 22 are pressed by the spring pieces 24a extending from both side ends of the leaf spring 24, the pressing force of each spring piece 24a can be adjusted. It is difficult and the pressing force of the spring piece 24a varies. As a result, there is a problem that the pressing force of the driven roller 20 of the driven roller 22 becomes unbalanced when the sheet is conveyed, and the sheet skews.

An object of the present invention is to provide a paper feeding device capable of preventing skew of paper.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention provides a sheet feeding device in which a driving roller and a driven roller are provided so as to contact each other with a passage path of the sheet sandwiched therebetween, and the driving roller is rotationally driven to convey the sheet. The gist of the invention is that the driven roller is divided at the central portion, a pressed portion is formed at the central portion, and a pressing member that presses the pressed portion toward the drive roller is provided.

[0006]

[Action]

 According to the present invention configured as described above, when the paper is sent between the driving roller and the driven roller, the driving roller is driven to rotate and the pressing member only presses the pressed portion in the center of the driven roller. Since the driven roller is also rotated to convey the paper while pressing, the pressing force of the pressing member becomes constant, and the skew of the paper can be prevented.

[0007]

【Example】

 An embodiment embodying the present invention will be described below with reference to FIGS. As shown in FIGS. 1 and 2, the sheet feeding device 1 is rotatable by mounting a drive roller 4 on a frame body 3 provided on both sides of a passage 2 for a sheet P via a support shaft 4a. . A driven roller 5 is in contact with the drive roller 4 above the drive roller 4, and a support shaft 5a pivotally attached to the driven roller 5 is in contact with the upper end of the frame 2. The driven roller 5 is divided into two parts at the central portion thereof, and a central shaft 5b as a pressed portion against which a spring piece 7b described later presses the driven roller 5 is exposed. Further, both sides of the support shaft 5a of the driven roller 5 are rotatably supported by a pair of support pieces 6 projecting from the upper end of the frame 3 so as to sandwich the support shaft 5a.

A plate panel 7 as a pressing member is screwed to the upper ends of both frame members 3 upstream of the driven roller 5. The leaf spring 7 is composed of an elastic and rectangular substrate 7a and a spring piece 7b extending from the center of the side end of the base plate 7a in the longitudinal direction toward the driven roller 5 side. The spring piece 7b constantly urges the central shaft 5b toward the drive roller 4 side.

A drive gear 8 is attached to one end of the support shaft 4 a of the drive roller 4 and meshes with a motor gear 9 a of a motor 9. Further, a plate-shaped paper guide 10 is provided on the passage 2 with the drive roller 4 interposed therebetween, and the paper guide 10 is attached to both frame bodies 3.

Next, the operation of the sheet feeding device configured as described above will be described. When the paper P is fed between the drive roller 4 and the driven roller 5, the drive of the motor 9 drives the drive roller 4 to rotate via the motor gear 9 a and the drive gear 8, and the spring piece of the leaf spring 7 By pressing the central shaft 5b of the driven roller 5 by 7b, the driven roller 5 also rotates and the paper P is conveyed.

As described above, in the sheet feeding device of this embodiment, since the spring piece 7b of the plate spring 7 presses only the central shaft 5b, the pressing force of the plate spring 7 becomes constant, and when the sheet P is conveyed. Can be prevented from skewing.

The present invention is not limited to the above embodiment, and may be arbitrarily modified without departing from the spirit of the present embodiment.

[0013]

[Effect of the device]

 As described in detail above, according to the paper feeding device of the present invention, since the pressing force of the leaf spring against the driven roller is constant, there is an excellent effect that skew of the paper can be prevented.

[Brief description of drawings]

FIG. 1 is a top view showing a paper feeding device of the present invention.

FIG. 2 is a side view showing the same paper feeding device.

FIG. 3 is a top view showing a conventional paper feeding device.

FIG. 4 is a side view of the same paper feeding device.

[Explanation of symbols]

1 paper feeding device, 2 passing path, 3 frame, 4 driving roller, 5 driven roller, 5b central shaft as pressed shaft,
7 Leaf springs as pressing members, P paper.

Claims (1)

[Scope of utility model registration request] 1. A paper feeding device in which a drive roller and a driven roller are provided so as to contact each other with a paper passage path interposed therebetween, and the drive roller is rotationally driven to convey the paper. And a pressing member that presses the pressed portion toward the drive roller side.