JPH01123772A - sheet feeding mechanism - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sheet feeding mechanism applied to printer mechanisms, facsimile mechanisms, and the like.

[Prior Art] Conventionally, a so-called paper feeding mechanism has been used in printer mechanisms, facsimile mechanisms, etc., in which a plurality of sheets of paper, for example, are stored in a paper storage unit and the sheets are fed out one by one as needed. It is being These paper feeding mechanisms generally consist of a pickup roller that picks up the paper, and a paper feeding/roller that feeds out only one sheet of paper.The control circuit applies rotational force to each of these rollers in response to instructions from the control circuit to feed the paper. We are sending out the goods.

Therefore, the simplest configuration requires a pickup roller motor, a paper feed roller motor, etc. that are controlled and driven by a control circuit and a drive circuit, or an electromagnetic clutch and a motor that are directly driven by a control means and a drive means. Met.

[Problems to be Solved by the Invention] However, in the above configuration, since each roller is equipped with a dedicated motor, etc., a control means and a drive circuit are required for each roller, which inevitably increases the size of the entire device.
It has problems such as increased product cost and decreased reliability.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a highly reliable, low-cost, and compact sheet feeder constructed with the minimum necessary drive source and component parts. It is to provide a mechanism.

[Means for Solving the Problems] “In order to solve the above-mentioned problems and achieve the purpose, the sheet feeding mechanism according to the present invention includes a rotating shaft that is rotatably supported, and a mechanism fixed to the rotating shaft. a sheet feeding roller that feeds the sheet, a driving means that drives the rotating shaft, and a clutch means that controls whether or not the driving force of the driving means is transmitted to the rotating shaft, the clutch means a first meshing member provided at one end of the rotating shaft that is slidable in the axial direction of the rotating shaft and rotates integrally with the rotating shaft; a second meshing member that rotates and engages with the first meshing member; a rotating member rotatably supported on the rotating shaft; a rotation transmitting portion provided on a part of the rotating member; It includes a transmission mechanism that converts the rotational direction of the rotational member and transmits the amount of rotation, and a guide mechanism that guides the first meshing member.

[Operation] In the sheet feeding mechanism configured as described above, for example, paper feeding is performed in the following order. That is, first, an operation is performed in which the rotational force of the driving means is transmitted to the rotating shaft by obtaining rotational force from the motor and causing the second engagement member, which is constantly rotated, to engage with the first engagement member.

This is a rotation transmitting part provided on a part of the rotating member rotated by the cam, which changes the direction of movement and transmits the amount of movement, and is connected to the second engaging member by a guide mechanism that guides the first engaging member. This is done by the first engaging members being engaged, and as a result, the rotational force of the driving means is transmitted to the roller shaft. A paper feed roller made of a material with a high coefficient of friction, such as rubber, is fixed to the rotating shaft, and a pickup roller that rotates in synchronization with the paper feed roller is provided. The paper feed roller and pick-up roller are roller assemblies that move up and down around a rotating shaft by receiving rotational force from a rotating member using a cam, and when they rotate downward, they come into contact with the paper. It acts to feed the paper, and in this state, the rotational force of the above-mentioned driving means is transmitted to the rotating shaft, so the rotational force is transmitted to the pickup roller and the paper feeding roller.

That is, in the sheet feeding mechanism according to the present invention, each roller and the clutch are operated in conjunction with each other by the operation of the cam, thereby minimizing the number of drive sources and components.

[Example] Hereinafter, an example of the present invention will be described in detail based on FIGS. 1 to 4.

(Description of Rotary Shaft Assembly) FIG. 1 is a partially sectional plan view showing the sheet feeding mechanism of the present invention. In FIG. 1, a rotating shaft 1 is provided on a left side plate 2 and a right side plate 3 constituting the main body, and is rotatably supported by a φ left shaft amount 4a and a right bearing 4b. An E-ring 7 is set at one end of the rotating shaft 1. On the other hand, a sliding meshing clutch 5 (first meshing member) and a meshing clutch 6 (second meshing member) are provided at one end of the rotating shaft 1 on the side supported by the right bearing 4b. Although the dog clutch 5 is slidable in the axial direction of the rotating shaft 1,
It is designed to rotate integrally with this rotating shaft 1. Further, the dog clutch 6 is rotatably supported around the rotary shaft 1, and is prevented from falling off by a retaining ring such as an E-ring 7.

That is, in FIG. 2, which is a perspective view showing the assembled state of this part, the rotating shaft 1 has a polygon (
A hexagonal portion (in the figure) is provided. On the other hand, the above-mentioned sliding dog clutch 5 is provided with a polygonal hole having some clearance so that it can be inserted into this polygon.

Therefore, after the sliding dog clutch 5 is inserted into the rotating shaft 1, it becomes freely slidable in the axial direction within the range S. Further, the sliding dog clutch 5 is provided with a flange portion, into which a recess 43a of a clutch mechanism, which will be described later, is pivotally supported. As mentioned above, the dog clutch 6 is supported on the rotary shaft 1, but the dog clutch 6 is set so that the meshing surface of the sliding dog clutch 5 and the meshing surface of the dog clutch 6 are opposite to each other. be done. One end of this dog clutch 6 is rotatable on the T surface of the rotating shaft 1, and the other end is restricted from moving in the sliding direction on the roller shaft 1 by the aforementioned E-ring 7.

Further, this dog clutch 6 is integrally provided with a gear portion. On the other hand, in FIG. 1, a motor 8 is attached to the right side plate 3, and a motor gear 10 is fixed to a rotating shaft 9 of the motor 8. A stud 11 is erected on the right side plate 3, and an idle gear 12 rotatable about the stud 11 is provided so as to be prevented from falling off by an E-ring or the like. The large gear part and the small gear part of the idle gear are integrally constructed, and the large gear part meshes with the aforementioned motor gear 10, and the small gear part meshes with the gear part of the clutch 6.

Therefore, motor 8 rotates and motor gear 1 moves in the direction of arrow a in the figure.
When the idler gear 12 rotates, the idle gear 12 first rotates in the direction indicated by the arrow C, and the rotation of the motor 8 is finally transmitted to the clutch gear 6 meshing with the idle gear 12 in the direction indicated by the arrow C.

(Description of Rotating Member 13) Next, in FIG. 3, which is a vertical cross-sectional view taken along the line A-A in FIG. Bearing holes 13a supported by the rotating shaft 1 on both sides
and 13b are provided.

A cam plate 3 (described later) is provided on the left side plate 2 side of the rotating member 13.
A cam follower roller 14 that is in pressure contact with zero is rotatably provided. The pressing force on the cam plate 30 indicated by the arrow F in the figure is obtained by the spring 15 provided above the rotating member 13 being stretched between the left side plate 2 and the rotating member 13. It has become.

On the other hand, the cam plate 30 is set so as to be rotatable about a cam stud 31 provided upright on the left side plate 2, and is prevented from falling off by an E-ring 7 or the like. A cam gear 32 is integrally provided on this cam plate 30. Further, a cam motor 33 for rotating this cam plate 30 is attached to the left side plate 2, and a cam motor gear 34 is rotated on a rotating shaft 35 of the cam motor 33.1. The cam gear 32 and the cam motor gear 34 mesh with each other so that the rotational force of the cam motor 33 is transmitted to the cam plate 30. FIG. 3 shows a state in which the cam follower roller 14 is in pressure contact with the small diameter portion of the cam plate 30, that is, a state in which the rotating member 13 is positioned in the direction indicated by arrow G.

Therefore, when the cam plate 30 is rotated in the direction of the arrow (■) by the action of the cam motor 33 and the aforementioned cam follower 14 is brought into pressure contact with the large diameter portion of the cam plate 30, the rotating member 13 is rotated in the direction indicated by the arrow H.
It will lean towards the direction.

A tilted plate portion 13 is provided on a part of the right side plate 3 of this rotating member 13.
c is integrally provided.

(Description of Clutch Assembly) Next, a clutch stud 46 is provided upright on the right side plate 3. This clutch stud 46 has a B clutch member 42 which has a bearing that rotatably supports the clutch roller 41.
and 1, A clutch member 43 having a recessed portion 43a at one end.
and are pivoted as shown in the figure. These are set on the clutch stud 46 so that they can be slid in the axial direction and rotated around the axis by means of a guide member (not shown).

In addition, these clutch members 42 and 43 are provided with an A compression coil spring 44 and a B compression coil spring 45, as shown in the figure.
and are held by the clutch stud 46. The pressure with which the tilt plate portion 13C is pressed against the slope plate portion 13C is obtained from this B compression coil spring 45.

The compression force of this B compression coil spring 45 acts on the clutch roller 41 via the B clutch member 42. The B compression coil spring 45 also acts to bias the A clutch member 43 to the solid line position in the figure, and the recess 43 provided at one end of the A clutch member 43
Since a is pivotally supported by the flange portion of the dog clutch 5 described above, the dog clutch 5 is biased to the position shown by the solid line in the figure. An E ring 47 is provided at the other end of the B compression coil spring 45 to prevent the B compression coil spring 45 from falling off and to receive the reaction of the compression force.

Furthermore, the B clutch member 42 and the A clutch member 43
The A compression coil spring 44 provided between the sliding mesh clutch 5 and the mesh clutch 6, which will be described later, is provided to prevent the meshing surfaces from coming into direct contact when the sliding meshing clutch 5 and meshing clutch 6 perform the meshing action. be. The A compression coil spring 44 also has the function of applying pressure to the engaging surfaces when the engaging surfaces are brought into occlusion.

(Description of Roller Assembly) Next, a paper feed roller (separation roller) 50 is fixed on the rotating shaft 1 approximately at the center of the paper path 100 indicated by the dashed line. An A timing pulley 53 is integrally provided. On the other hand, the pickup roller 51 is rotatably supported by a bearing part of an arm member 52 which is rotatably supported by the rotary shaft 1, and a B timing pulley 54 provided integrally with the pickup roller 51 is A timing pulley 55 for synchronous rotation with the A timing pulley 53 described above is meshed. Therefore, when rotational force is transmitted to the rotating shaft 1, the separation roller 50 and the pickup roller 51 rotate in synchronization.

This arm member 52 is provided with a protrusion g, and the cam plate 30 moves eight times in the direction of arrow G so that a portion of the aforementioned rotating member 13 comes into pressure contact with this protrusion g by the action of the spring 15. When the pickup roller 51 is in the up position, it acts to keep the pickup roller 51 in the raised state.

Next, FIG. 4 shows a state in which the cam plate 30 is rotated in the direction of the arrow {circle around (2)} and the pickup roller 51 is lowered. In this figure, the pressure force of the pickup roller 51 on the paper S is as follows:
The spring plate 56 attached to the rotating member with rivets or the like causes the arm member 52 to move due to the spring force generated when the spring plate 56 is deformed in the direction shown by the arrow P.
I try to get by giving to others.

Also, a separation plate 5 is provided at a position facing this roller assembly.
7 is provided around a separation plate shaft 58 fixed to the main body. A spring 59 is stretched on one end of the separation plate 57 so that the separation roller 50 and the other end of the separation plate 57 are pressed against each other. This separation plate 57 is provided to send out only one sheet from a plurality of sheets.

(Operation Description) The operation of the sheet feeding mechanism configured as described above will be described next. FIG. 3 shows a state in which the cam follower 14 provided on the rotating member 13 is in pressure contact with the small diameter portion of the cam plate 30, and the pickup roller 51 is separated from the paper S. . In this state, no rotational force is transmitted to the rotating shaft 1, so even if the edge of the paper S contacts the separation roller 50, the paper S is not sent out. Next, cam motor 3
When the cam plate 30 is rotated in the direction of the arrow ■ by the action of 3, the rotating member 13 is rotated in the direction of the arrow H, and the pickup roller 51 obtains the spring force of the spring plate 56 as shown in FIG. The paper S is brought into pressure contact with the paper S. In synchronization with the rotation of the rotation member 13, the rotational force of the motor 8 is transmitted to the rotation shaft 1 via a clutch mechanism, and the occlusal force of the clutch mechanism is Plate part 13C
It is structured so that you can get more from it.

This inclined plate portion 13C is rotated in the same way when the rotating member 13 is tilted in the direction of arrow H in FIGS. 1 and 3, so it moves eight times in the direction shown by arrow Become. On the other hand, since the tartling roller 41 is rotatably pressed against this inclined plate part 13C as described above, the rotating member 13 is inclined in the direction of arrow X, and the inclined plate part 13C moves to the position shown by the broken line in the figure. When the clutch roller 41 is moved, the clutch roller 41 is also moved to the position shown by the broken line in the figure. As a result, the clutch roller 41 is moved in the direction of arrow Y.

That is, the inclined plate portion 13C and the clutch roller 41 act to convert the rotational movement of the rotational member 13 about the rotation axis IN into linear movement. Clutch opening in direction of arrow Y, -
When the clutch member 41 moves and the B clutch member 42 moves to the position indicated by the dotted line in FIG.
Compression coil spring 44 is compressed. As a result, the compression force of this A compression spring 44 acts on the A clutch member 43,
The A clutch member 43 is moved in the direction of arrow Z. As mentioned above, this A clutch member 43 has a recess 43 for pivotally supporting the flange portion of the sliding mesh clutch 5.
Since a is provided, the sliding dog clutch 5 comes to mesh with the dog clutch 6 by this swJ operation.

Since the rotational force of the motor 8 is transmitted to the dog clutch 6, the rotational force in the direction of arrow C is transmitted to the rotating shaft 1.

Next, FIG. 4 shows a state in which a rotational force in the direction of the arrow d%e is transmitted to the separation roller 50 and the pickup roller 51.

Here, the paper S is sent out in the direction indicated by the arrow X by obtaining frictional drive for paper feeding from the separation roller 50 and the pickup roller 51.

At this time, the separation plate 57 and the separation roller 50 work together to send out only the topmost sheet from the plurality of sheets.

To briefly describe the principle, when the friction coefficient between the separation plate 57 and the paper S is μm, the friction coefficient between the paper sheets S is μ2, and the friction coefficient between the separation roller 50 and the paper S is μ3,
By maintaining the relationship μ3>μm>μ2, only one sheet of paper S located at the top is sent out in the direction of arrow X (FIG. 4). Next, after feeding out only one sheet of paper S, the cam plate 30 rotates in the direction opposite to the arrow ■, and the clutch mechanism described above is released, so that rotational force is transmitted to the rotating shaft 1. The paper feed operation is in a standby state.

As described above, in this embodiment, the paper can be fed out using only the motor 8 and the cam motor 33 as driving sources. Since these drive sources are organically and efficiently operated by a paper detection device and a control circuit (not shown), there is also an advantage that power consumption is reduced and the power supply device is also miniaturized. Furthermore, although we have described an example in which only the cam plate 30 is provided as the cam means, by adding a second cam plate, a third cam plate, etc. integrally with this cam plate 30,
Among the operations performed in conjunction with the paper fed out by the sheet feeding mechanism of the present invention, for example, the contacting and separating operations of the reading sensor, etc. can also be performed in conjunction with each other.

[Effects of the Invention] As explained above, the sheet feeding mechanism of the present invention includes a rotating shaft rotatably supported, a sheet feeding roller fixed to the rotating shaft for feeding the sheet, and a sheet feeding roller fixed to the rotating shaft. The clutch means is provided with a driving means for driving, and a clutch means for controlling whether or not to transmit the driving force of the driving means to the rotating shaft, and the clutch means is slidable in the axial direction of the rotating shaft and is connected to the rotating shaft. a first meshing member provided at one end of the rotating shaft that rotates integrally; and a second meshing member that rotates with rotational force from the driving means about the rotating shaft as a center of rotation and meshes with the first meshing member. , a rotating member rotatably supported on the rotating shaft; a rotation transmitting portion provided in a part of the rotating member; and a rotational amount of the rotating member is transmitted by converting the direction of the rotational force of the rotating member. The sheet feeding mechanism is characterized in that it includes a transmission mechanism that guides the first meshing member, and a guide mechanism that guides the first meshing member.

Therefore, according to the present invention, a highly reliable sheet feeding mechanism composed of the minimum necessary drive source and component parts can be realized at low cost.

[Brief explanation of the drawing]

1 is a partially sectional plan view of an embodiment of the sheet feeding mechanism according to the present invention, FIG. 2 is an exploded perspective view of the rotating shaft 1 shown in FIG. 1, and FIG. 3 is the same as that shown in FIG. 1. FIG. 4 is a cross-sectional view taken along line AA' in FIG. 1. In the figure, 1... Rotating shaft, 5... Sliding dog clutch, 6... Dog clutch, 8... Motor, 13...
... Rotating member, 13C... Inclined plate part, 14... Cam floor, 30... Cam plate, 33... Cam bottom part, 4
DESCRIPTION OF SYMBOLS 1... Lagging roller, 42... B clutch member, 43... A clutch member, 44... A compression coil spring, 45... B compression fill spring, 46... clutch stud, 50... separation Roller, 51... indicates a pickup roller. Figure 2

Claims (3)

[Claims] (1) A rotary shaft that is rotatably supported, a sheet feeding roller fixed to the rotary shaft that feeds the sheet, a driving means for driving the rotary shaft, and a driving force of the driving means that is transmitted to the rotary shaft. and a clutch means for controlling whether or not to transmit data to the rotary shaft, the clutch means being slidable in the axial direction of the rotary shaft and rotating integrally with the rotary shaft. a second meshing member that rotates with rotational force from the driving means about the rotational shaft and engages with the first meshing member; and a rotational member that is rotatably supported on the rotational shaft. a rotation transmission portion provided in a part of the rotation member; a transmission mechanism that converts the rotation direction of the rotation member and transmits the amount of rotation; and a guide mechanism that guides the first meshing member. A sheet feeding mechanism characterized by comprising: (2) The sheet feeding mechanism according to claim 1, wherein the rotating member is rotated by a cam. (3) A pickup roller assembly consisting of a pickup roller that rotates in synchronization with the sheet feeding roller, and an arm member that freely rotates around the rotation shaft that rotatably supports the pickup roller. The sheet feeding mechanism according to claim 1, wherein the rotating force is obtained from the rotating member.