JPH0784264B2 - Sheet feeding mechanism - Google Patents

Description

The present invention relates to a sheet feeding mechanism applied to a printer mechanism, a facsimile mechanism, and the like.

[Prior Art] Conventionally, as a sheet, for example, a plurality of sheets are accommodated in a sheet accommodating portion, and the sheets are fed one by one as needed, a so-called sheet feeding mechanism is used in a printer mechanism, a facsimile mechanism, or the like. Has been. These paper feed mechanisms are generally composed of a pick-up roller that picks up the paper and a paper feed roller that feeds only one sheet of paper, and feeds the paper by applying rotational force to each of these rollers according to an instruction from the control circuit. Are doing.

Therefore, in the simplest configuration, the pick-up roller motor, the paper feed roller motor controlled / driven by the control circuit and the drive circuit, or the electromagnetic clutch and the motor directly driven by the control means and the drive means are used. It was necessary.

[Problems to be Solved by the Invention] However, in the above configuration, since each roller can be provided with a dedicated motor or the like, a control means and a drive circuit are required for each roller, which inevitably increases the size of the entire apparatus. However, there are problems such as increase in reliability and decrease in 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 a highly reliable, low-priced, and small-sized sheet feeding mechanism including a minimum required drive and components. Is to provide.

[Means for Solving the Problems] In order to solve the above problems and achieve the object, the sheet feeding mechanism of the present invention has the following configuration. That is, the feeding roller that feeds the sheet, the feeding roller that rotatably supports the feeding roller, and the first position where the feeding roller comes into contact with the sheet by swinging, and the first position that does not come into contact with the sheet. A swinging member that is swingably supported to move to a position of 2, a driving unit for driving the feeding roller, and a driving force of the driving unit is transmitted to the feeding roller. And a clutch means for switching whether or not the feeding roller is in the first position, the driving force of the drive means is transmitted to the feeding roller, and the feeding roller is the second roller. Switching means configured to switch the clutch means by receiving a component force due to the oscillating motion of the oscillating member so that the drive force of the drive means is not transmitted to the feeding roller when the position is With That.

Further, the movement of the swing member is performed by a cam means.

Then, power transmission to the second feeding roller that is driven in synchronization with the feeding roller is performed via a central shaft body that swingably supports the swinging member.

[Operation] In the sheet feeding mechanism configured as described above, for example, sheet feeding is performed in the following order. That is, first, the operation of transmitting the rotational force of the driving means to the rotary shaft by constantly engaging the second meshing member and the first meshing member that are being rotated by obtaining the rotational force from the motor is performed. This is a rotation transmitting portion provided in a part of the rotating member rotated by the cam, and converts the moving direction to transmit the moving amount, and the guide mechanism for guiding the first engaging member guides the second engaging member and the second engaging member. It is performed by one meshing member being occluded,
As a result, the rotational force of the driving means is transmitted to the roller shaft.
A paper feed roller made of a material having a high coefficient of friction such as rubber is fixed to the rotary shaft, and a pick up roller that rotates in synchronization with the paper feed roller is provided. The paper feed roller and the pick-up roller are a roller assembly that is configured to move up and down by a turning member from a turning member with a rotating shaft as a center of rotation so that the paper comes into contact with the paper when it is turned downward. Although it operates so as to send out the paper, in this state, the rotational force of the drive means is transmitted to the rotary shaft, so the rotational force is transmitted to the pick-up roller and the paper feed roller. That is, in the sheet feeding mechanism according to the present invention, the driving source and the constituent parts are minimized by causing the rollers and the clutch to work in conjunction with each other by the operation of the cam.

[Embodiment] An embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 4.

(Explanation of Rotating Shaft Assembly) FIG. 1 is a partial sectional plan view showing a sheet feeding mechanism of the present invention. In FIG. 1, a rotary shaft 1 includes a left side plate 4a and a right bearing 4b provided on a left side plate 2 and a right side plate 3 constituting a main body.
Is rotatably supported by. An E-ring 7 is set at one end of the rotary shaft 1. On the other hand, the right bearing 4b of this rotating shaft 1
A sliding mesh clutch 5 (first meshing member) and a meshing clutch 6 (second meshing member) are provided at one end on the side that is pivotally supported by the rotary meshing shaft 5 of the rotary shaft 1. Although it is slidable in the direction, it is adapted to rotate integrally with the rotary shaft 1. The mesh clutch 6 is rotatably supported around the rotary shaft 1 as a center of rotation, and is prevented from falling off by a retaining ring such as an E ring 7.

That is, in FIG. 2 of the perspective view showing the assembled state of this portion, the rotary shaft 1 is provided with a polygonal (hexagonal in the figure) portion in the range indicated by S in the figure. On the other hand, the sliding mesh clutch 5 described above is provided with a polygonal hole having a slight clearance so that it can be inserted into this polygon.

Therefore, the sliding mesh clutch 5 is slidable in the axial direction within the range of S after being inserted into the rotary shaft 1. Further, the sliding mesh clutch 5 is provided with a flange portion, and a concave portion 43a of a clutch mechanism described later is pivotally supported in this portion. Although it has been described that the meshing clutch 6 is rotatably supported on the rotary shaft 1, the meshing surface of the sliding meshing clutch 5 and the meshing clutch 6 are described above.
The meshing clutch 6 is set so as to face the meshing surface of. One end of this mesh clutch 6 has a rotary shaft 1
The other end of the T surface is free from rotation in the sliding direction on the roller shaft 1 by the E ring 7 described above.

A gear portion is integrally provided on the meshing clutch 6. 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 rotary shaft 9 of the motor 8. A stud 11 is erected on the right side plate 3, and an idle gear 12 which is rotatable around the stud 11 as a rotation center is provided by an E-ring or the like so as to be prevented from falling off. The idle gear large gear portion and the small gear portion are integrally formed, and the large gear portion meshes with the above-described motor gear 10 and the small gear portion meshes with the gear portion of the clutch 6.

Accordingly, the motor 8 rotates and the motor gear 10 moves in the direction of arrow a in the figure.
First, the idle gear 12 rotates in the direction of arrow b, and the clutch gear 6 meshed with the idle gear 12 finally transmits the rotation of the motor 8 in the direction of arrow c.

(Explanation of Rotating Member 13) Next, in FIG. 3 which is a vertical sectional view showing a sectional view taken along the line AA of FIG. 1, the rotating member 13 is rotatably supported by the rotating shaft 1 on both sides. Bearing holes 13a and 13b that are rotatably supported by the rotating shaft 1 on their surfaces
And are provided.

On the left side plate 2 side of the rotating member 13, a cam follower roller 14 which is brought into pressure contact with a cam plate 30 described later is rotatably provided. The pressure contact force to the cam plate 30 indicated by the arrow F in the figure can be 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 is becoming like this.

On the other hand, the cam plate 30 is set so as to be rotatable about a cam stud 31 standing on the left side plate 2 as a rotation center.
The E-ring 7 and the like prevent it from falling off. This cam plate
A cam gear 32 is integrally provided on 30. A cam motor 33 for rotating the cam plate 30 is attached to the left side plate 2, and a rotation shaft 35 of the cam motor 33 has a cam motor gear.
34 is fixed, 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 changed to the cam plate.
Configured to be transmitted to 30. In FIG. 3, the cam plate 30
The state where the cam follower roller 14 is pressed against the small diameter part of
That is, the state where the rotating member 13 is located in the direction indicated by the arrow G is shown.

Therefore, when the cam plate 30 rotates in the direction of arrow I by the action of the cam motor 33 and the above-mentioned cam follower 14 comes into pressure contact with the large diameter portion of the cam plate 30, the rotating member 13 tilts in the direction of arrow H. It will be.

An inclined plate portion 13c is integrally provided on a part of the rotating member 13 on the right side plate 3 side.

(Description of clutch assembly) Next, the clutch stud 46 is erected on the right side plate 3.
The clutch stud 46 includes a B clutch member 42 having a bearing for rotatably supporting the clutch roller 41 and a recess.
An A clutch member 43 having 43a at one end is pivotally supported as shown. These are set in the clutch stud 46 so as to be slidable in the axial direction by a guide member (not shown) and rotatable about the axis.

Further, the clutch members 42 and 43 are adapted to hold an A compression coil spring 44 and a B compression coil spring 45 on a clutch stud 46 as shown in the figure. The pressure with which the clutch roller 41 is pressed against the inclined plate portion 13C is obtained from the B compression coil spring 45.

The compression force of the B compression coil spring 45 is the compression force of the B clutch member 42.
The clutch roller 41 is acted on via. The B compression coil spring 45 also causes the A clutch member 43 to be urged to the solid line position in the figure at the same time. The recess 43a provided at one end of the A clutch member 43 has the flange of the mesh clutch 5 described above. The meshing clutch 5 is biased to the position shown by the solid line in the figure because it is pivotally supported by the section. 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 receive a reaction force of the compression force.

Furthermore, the A compression coil spring 44 provided between the B clutch member 42 and the A clutch member 43 directly engages with the meshing surface when the sliding meshing clutch 5 and the meshing clutch 6 which will be described later engage with each other. It is provided to prevent contact. Further, the A compression coil spring 44 also has a function of exerting pressure on the meshing surface when the meshing surface is meshed.

(Explanation of Roller Assembly) Next, the paper feed roller (separation roller) 50 is fixed on the rotary shaft 1 at the substantially central portion of the paper path 100 indicated by the alternate long and short dash line. A timing pulley 53 is provided in the. On the other hand, the pick-up roller 51 is rotatably supported by the bearing portion of the rotatable arm member 52 which is rotatably supported by the rotating shaft 1.
A B timing pulley 54 integrally provided with 51 is meshed with a timing pulley 55 for rotating in synchronization with the A timing pulley 53 described above. Therefore, when the rotational force is transmitted to the rotary shaft 1, the separation roller 50 and the pick-up roller 51 rotate in synchronization with each other.

The arm member 52 is provided with a protrusion g, and the cam plate 30 moves in the direction of arrow G so that the protrusion f is pressed against the protrusion f of the rotating member 13 by the action of the spring 15. When it is, it works to keep the pick-up roller 51 raised.

Next, FIG. 4 shows a state in which the cam plate 30 is rotated in the direction of arrow I and the pick-up roller 51 is lowered. In this figure, the pressing force of the pick-up roller 51 against the sheet S is generated when the spring plate 56 attached to the rotating member by a riveting or the like causes the spring plate 56 to deform the arm member 52 in the direction indicated by the arrow P. It is obtained by applying the spring force to the arm member 52.

In addition, at a position facing the roller assembly, the separation plate 57
Is provided with a separation plate shaft 58 fixed to the main body as the center of rotation. A spring 59 is stretched around one end of the separation plate 57 so that the separation roller 50 and the other end of the separation plate 57 are in pressure contact with each other. The separating plate 57 is provided to feed only one sheet out of a plurality of sheets.

(Description of Operation) The operation of the sheet feeding mechanism configured as described above will be described below. In FIG. 3, the rotating member 13 is shown in a state in which the cam follower 14 provided on the rotating member 13 is pressed against the small diameter portion of the cam plate 30 so that the pick-up roller 51 is separated from the sheet S. . In this state, since the rotational force is not transmitted to the rotary shaft 1, even if the paper edge of the paper S contacts the separation roller 50, the paper S is not delivered. Next, when the cam plate 30 is rotated in the direction of arrow I by the action of the cam motor 33, the rotating member 13 is rotated in the direction of arrow H, and the pick-up roller 51 of the spring plate 56 is rotated as shown in FIG. The spring force is obtained and the sheet S is brought into pressure contact. The rotating force of the motor 8 is transmitted to the rotating shaft 1 through the clutch mechanism in synchronization with the rotating action of the rotating member 13. The occlusal force of this clutch mechanism is the rotating member 13.
It is configured to be obtained from the inclined plate portion 13C provided on the.

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

That is, the rotary motion of the rotary member 13 about the rotary shaft 1 is converted by the inclined plate portion 13C and the clutch roller 41 into a linear motion. When the clutch roller 41 moves in the direction of the arrow Y and the B clutch member 42 moves to the position shown by the dotted line in FIG. 1, the A compression coil spring accommodated inside the B clutch member 42 is held by the clutch stud 46. 44
Is compressed. As a result, the compression force of the A compression spring 44 acts on the A clutch member 43 to move the A clutch member 43 in the arrow Z direction. As described above, since the A-clutch member 43 is provided with the recess 43a pivotally supporting the flange portion of the sliding mesh clutch 5, the sliding mesh clutch 5 meshes with the mesh clutch 6 by this moving operation. Come to do.

Since the rotational force of the motor 8 is transmitted to the meshing 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 rotational forces in the directions of arrows d and e are transmitted to the separation roller 50 and the pick-up roller 51.

Here, the paper S is obtained by the frictional driving of the paper feeding being obtained from the separation roller 50 and the pick-up roller 51 and fed in the direction indicated by the arrow X.

At this time, the separating plate 57 and the separating roller 50 work together so as to send out only the uppermost sheet from a plurality of sheets.

Briefly describing the principle, when the friction coefficient between the separation plate 57 and the paper S is μ ₁ , the friction coefficient between the papers S is μ ₂ , and the friction coefficient between the separation roller 50 and the paper S is μ ₃ , μ ₃
By maintaining the relationship of> μ ₁ > μ ₂ , only the topmost sheet S is fed in the direction of arrow X (FIG. 4). Next, after feeding out only one sheet S, the cam plate 30 rotates in the direction opposite to the arrow I, and the above-mentioned clutch mechanism is released, so that the rotating shaft 1 is not rotated. It is not transmitted, and the paper feed operation is in a standby state.

As described above, in the present embodiment, it is possible to feed the paper only by the rotation means of the motor 8 and the cam motor 33 as the drive source. Since these drive sources are organically and efficiently operated by the sheet detection device and the control circuit (not shown), there is an advantage that the power consumption is reduced and accordingly the power supply device is downsized. Also, a cam plate as the cam means
Although the example in which only 30 is provided has been described, by adding the second cam plate, the third cam plate, etc. integrally with the cam plate 30, it is possible to attach the sheet to the sheet fed by the sheet feeding mechanism of the present invention. It is also possible to perform the contact / separation operation of the reading sensor in conjunction with the operation performed by the above.

[Effects of the Invention] As described above, according to the present invention, it is possible to configure a minimum necessary drive source and constituent parts, and to reliably transmit power to the feeding roller when the feeding roller operates. Can
In addition, it is possible to realize a highly reliable sheet feeding mechanism that can reliably stop power transmission to the feeding roller when the feeding roller is not operating, at low cost.

[Brief description of drawings]

FIG. 1 is a partially sectional plan view including an embodiment of a sheet feeding mechanism according to the present invention, FIG. 2 is an exploded perspective view of a rotary shaft 1 shown in FIG. 1, and FIG. 3 is shown in FIG. FIG. 4 is a sectional view taken along the line AA ′ of FIG. 4, and FIG. 4 is a sectional view taken along the line AA of FIG. 1. In the figure, 1 ... rotary shaft, 5 ... sliding mesh clutch, 6
…… Mating clutch, 8 …… Motor, 13 …… Rotating member, 13C …… Inclined plate part, 14 …… Cam floor, 30 …… Cam plate, 33 …… Cam motor, 41 …… Clutch roller, 42 ……
B clutch member, 43 …… A clutch member, 44 …… A
A compression coil spring, a 45 ... B compression file spring, a 46 ... clutch stud, a 50 ... separation roller, and a 51 ... pickup roller are shown.

Claims (3)

[Claims] 1. A feeding roller for feeding a sheet, and a first feeding roller for rotatably supporting the feeding roller and contacting the feeding roller with the sheet by swinging the first feeding roller.
And a swinging member that is swingably supported to move to a second position where the sheet does not come into contact with the sheet, a driving unit for driving the feeding roller, and a driving force of the driving unit. A clutch means for switching whether or not to transmit to the feeding roller; a driving force of the driving means to be transmitted to the feeding roller when the feeding roller is in the first position; ,
When the feeding roller is in the second position, the clutch means is received by receiving a component force due to the swing motion of the swing member so that the driving force of the driving means is not transmitted to the feed roller. A sheet feeding mechanism comprising: a switching unit configured to switch. 2. The sheet feeding mechanism according to claim 1, wherein the movement of the swing member is performed by a cam means. 3. A second drive driven in synchronization with the feeding roller.
2. The sheet feeding mechanism according to claim 1, wherein the power transmission to the feeding roller is performed via a central shaft body that swingably supports the swinging member.