JP3297537B2 - Recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation transmission device using a gear having a toothless portion and a recording device using the rotation transmission device.

[0002]

2. Description of the Related Art Conventionally, a first gear having a toothless portion and a second gear that can mesh with the first gear are provided.
When the teeth of the first gear mesh with the teeth of the second gear, rotation is transmitted from the second gear connected to the drive source such as a motor to the first gear, and the first gear is rotated during rotation. There is a rotation transmitting device that cuts off transmission of rotation from the second gear to the first gear when the toothless portion of the second gear is disengaged from the second gear. A transmission device is applied to a sheet material feeding device for feeding a sheet material.

In a rotation transmission device using a gear having a toothless portion, since the transmission of rotation is always interrupted at the toothless portion, the rotation transmission device may be used to stop rotation at a predetermined rotation such as one rotation. This is an extremely useful mechanism because it is inexpensive and easy to control without using an electromagnetic clutch or the like when used.

[0004]

However, the conventional sheet feeding apparatus using a rotation transmission device using a gear having a toothless portion has the following problems.

When the toothless portion of the first gear is disengaged from the tooth portion of the second gear and transmission of rotation is interrupted, the tooth portion of the first gear and the tooth portion of the second gear are disengaged. Are slightly separated from each other, and due to looseness or deformation of each gear, the teeth of the idle second gear and the teeth of the first gear interfere with each other, generating abnormal noise and vibration. There was a problem.

The present invention has been made in view of the above problems, and has as its object to prevent generation of abnormal noise and vibration when transmission of rotation is interrupted.

[0007]

SUMMARY OF THE INVENTION According to the present invention, there is provided a sheet material loading table on which a plurality of sheet materials are loaded, and a sheet feeding apparatus which feeds the sheet material in contact with the sheet material loaded on the sheet material loading table. A roller, a separating member for separating the sheet material fed by the feeding roller, an elastic member for urging the sheet material stacking table and the feeding roller to approach each other, and a rotating shaft of the feeding roller. A cam member that is disposed on the sheet material stacking table and separates the feed roller against the urging force of the elastic member; a follower member that is disposed on the sheet material loading table and engages with the cam member; A slope provided in a concave portion provided in one of the cam member or the follower member, a convex portion provided in the other of the cam member or the follower member, and a driving source for generating a driving force for driving the feed roller And the feed roller A feed gear arranged on the rotary shaft, a planetary gear for transmitting the driving of the driving source meshes with the feed gear to said feed gear, disposed on the feed gear the cam
A toothless part having a relative phase relationship maintained constant with the member , wherein the transmission of drive from the planetary gear to the feed gear is interrupted by the toothless part; When the meshing between the planetary gear and the tooth portion of the feed gear is disengaged by the tooth portion, the projecting portion moves along the inclined surface by the urging force of the elastic member, so that the feed gear moves in the rotational direction. A state in which the sheet material loading table and the feed roller are separated by the constant rotation and the engagement of the cam member and the follower member at a position where interference between the tooth portion of the feed gear and the planetary gear is prevented. Is held.

[0008]

[0009]

According to the above construction, when the toothless portion of the feeding gear is disengaged from the planetary gear, the elastic member is urged in a direction to bring the sheet material loading table and the feeding roller closer. The feeding gear is rotated by a predetermined amount in the rotation direction by moving the convex portion provided on the other of the cam member or the follower member along the inclined surface provided on one of the cam member or the follower member by the force, thereby feeding the feeding gear. And the planetary gears are prevented from interfering with each other.

[0010]

[0011]

[0012]

1 and 2 show a first embodiment in which the present invention is applied to an ink jet printer using an ink jet system as a recording means. FIG. 1 is a schematic view showing the mechanism of the present apparatus, and FIG. It is sectional drawing of this apparatus.

In FIG. 2, a cover 1 is provided outside the apparatus body.
And a lid 2 rotatable about a shaft 2a. The lid 2 also serves as a sheet material tray. The sheet material is inserted from an insertion port 1a provided in the cover 1 and is discharged from an insertion port 1b.
Is discharged from Inside a plurality of side plates 3 provided in the cover 1, a sheet material loading table urged toward a feed roller 9 (upward) by a spring 5, one end of which is fixed around a shaft 4 a by a pin 6. (Sheet material loading means) 4,
A feeding roller (sheet material feeding means) 9 having a long radius portion capable of contacting the sheet material and a short radius portion not contacting the sheet material and fixed to the shaft 8; The driving cam 7 which rotates to engage with the follower portions 4b provided at the left and right ends of the sheet material loading table 4 to push the sheet material loading table 4 downward, and the sheet material fed by the feeding roller 9. The contact member (separating means) 1 is a separating member that separates the sheet material by causing an angle change due to the contact.
0, and a surface 11a in which the leading end of the sheet material separated by the contact member 10 is guided in an ascending direction, and the sheet material and the contact member 1 are guided by the surface 11a.
And a guide member 11 for separating the leading end of the zero.

On the downstream side of the guide member 11, there is provided a light emitting portion and a light receiving portion, and a photo sensor (sheet material detecting means) for detecting the front end and the rear end of the sheet material with or without reflected light.
PH, a conveying roller (transporting means) 13 for conveying the sheet material fed at a constant speed guided by the upper guide 28a and the guide member 11 fixed to the shaft 12 by the feeding roller 9, and rotated by the shaft 14. The sheet material is provided freely by the force of a spring 15 via a shaft
A first pinch roller 16 pressing the ink absorbing member 17
, A paper discharge roller 20 fixed to a shaft 19 for discharging a printed sheet material, and a rotatable shaft 21 for discharging the sheet by the force of a spring 22 via the shaft 21. 2nd pinch roller 2 pressing against
3, a carriage 26 which is guided by guide shafts 24 and 25 and is movable in the width direction of the paper, and is mounted on the carriage 26, and prints by discharging ink from a discharge unit 27a in accordance with image information. And a recording head 27 for performing the recording.

The carriage 26 includes a motor 29 provided on a central side plate 28 having an upper guide 28a, a pulley 30 provided on an output shaft thereof, and a belt fixed at one end to the carriage 26 and attached to the pulley 30. 3
1 driven.

Further, an operation electric board 33 provided with a plurality of switch buttons 32 protruding from a hole of the case 1 inside the case 1 and a microcomputer provided below the sheet material mounting table 4. A control electric board (control means) 34 for controlling the operation of the apparatus by mounting a memory and a memory is appropriately arranged.

The mechanism of the present apparatus will be further described with reference to FIG. First, switching means for bringing the sheet material on the sheet material loading table 4 into contact with and separating from the feeding roller 9 will be described.

A driving cam (cam member) 7 fixed to the shaft 8 of the feeding roller 9 and a follower portion 4b provided on the sheet material mounting table 4 are in contact at a predetermined position by the force of the spring 5. The driving cam 7 is synchronized with the feeding rotation of the feeding roller 9.
With the rotation of the driving cam 7, the sheet loading table 4 moves up and down to contact and separate the sheet and the feeding roller 9.

A pulley 37 provided at one end of the transport roller shaft 12 and a pulley 3 provided at one end of the discharge roller shaft 19
8 is connected by a belt 39, the rotation of a motor M, which is a drive source, is transmitted to the paper discharge roller 20 via the shaft 12.

A cap table 41 having a cap 40 for covering the ink discharge portion 27a of the recording head 27 is provided on the opposite side of the sheet material conveyance path from the motor. The cap table 41 has a rotating shaft 41a and a push-down cam portion 41b.
The rotation is urged in the counterclockwise direction about. And
When the protrusion 26a of the carriage 26 comes into contact with the push-down cam 41b due to the movement of the carriage 26, the cap table 41 is pushed down against the force of the spring 42 and the cap 40 is also lowered, and the protrusion 26a is pushed down by the push-down cam 41.
b, the cap 40 rises, and the ejection portion 27
a to cover the discharge port.

The pump 43 has a piston shaft 43b having a rack 43a, a suction port 43c, and a discharge port 43d. The suction port 43c and the cap 40 are formed by a tube 40a. And the tube 44 are connected to each other, and the ink sucked from the cap 40 is discharged to the absorbing member 17 in the platen 18.

The pump driving gear 45 meshed with the rack 43a of the pump 43 is provided on the shaft 12 so as to be movable in the direction along the axis of the shaft 12 and to be interlocked with the rotation of the shaft 12. It is biased by a spring 46 to a position where it does not mesh with the rack 43a.

In the vicinity of the discharge port of the recording head 27, solid components of the ink are liable to adhere to the recording head 27, which may cause discharge failure. At that time, the motor 29 moves the carriage 26 and connects the ejection unit 27 a to the cap 40 in accordance with a command from the controller 34 to perform the ejection failure recovery operation. The carriage 2
6, the protrusion 26b of the carriage 26 moves the pump drive gear 45 to the position shown by the two-dot chain line, so that the pump drive gear 45 is engaged with the rack 43a. In this state, when the gear 45 repeats a predetermined number of forward and reverse rotations within a predetermined rotation angle by the driving of the motor M, the rack 43a performs a reciprocating movement in the straight traveling direction a predetermined number of times. Since the reciprocating motion of the rack 43a also reciprocates the piston in conjunction with the piston shaft 43b, the pump 43 absorbs the ink and its solid content from the ink discharge portion 27a,
Further, the sucked material is discharged to the absorbing member 17 in the platen 18.

Next, the structure of the drive transmitting means for transmitting the rotation of the motor M to the feed roller 9 and the transport roller 13 will be described.

The motor M has an output gear 47 provided on the motor shaft in accordance with a signal from the controller 34, and a two-stage gear 48.
Then, the conveying roller pairs 13 and 16 are rotated via the conveying roller gear 49 fixed to the shaft 12 to convey the sheet material.

On the other hand, the motor M rotates the output gear 47, the two-stage gear 48, and the gear 51 fixed to the shaft 50. A first planetary gear 53 meshing with a first sun gear 52 similarly fixed to the shaft 50 is constituted by a large planetary gear 53a and a small planetary gear 53b, and a shaft 54 of the first planetary gear 53 rotates around the shaft 50. It is pivotally supported by the moving first carrier 55.

The first planetary gear 53 is connected to one arm member 55 of the first carrier by a spring 56 provided on a shaft 54.
Since a predetermined pressure is applied to a, a certain load is applied to the rotation of the first planetary gear 53.

1 and 3, the first sun gear 52 rotates in the direction of the arrow 50a due to the rotation of the output gear 47 provided on the shaft of the motor M in the direction of the arrow 47a. Since a large load is applied to the rotation of the large planetary gear 53a that meshes with the first sun gear 52, the first planetary gear 53 revolves around the first sun gear 52 in the direction of the arrow 50a without rotating. The first carrier 55 also rotates in the direction of the arrow 50a by this revolution, so that the small planetary gear 53b and the gear 57 fixed to the feed roller shaft 8 are engaged with each other, so that the rotation of the motor M in the direction of the arrow 47a As a result, the paper feed roller 9 rotates in the feeding direction 8a.

The gear 57 is provided with a toothless portion 57a. When the rotation of the gear 57 advances and the toothless portion 57a comes into a meshing position with the small planetary gear 53b, the small planetary gear 53b idles and the gear 57 is rotated. The rotation of the gear 57 and the paper feed roller 9 in the feeding direction is stopped.

In FIG. 1 and FIG.
The sun gear 52 rotates in the direction of the arrow 50b due to the rotation in the direction 7b. Following the rotation, the first carriers 55, 55
a rotates together with the first planetary gear 53 in the direction of the arrow 50b. The rotation of the first carrier 55 in the direction of the arrow 50b causes the small planetary gear 53b to be disengaged from the meshing position with the gear 57, and the one arm member 55a of the first carrier 55 to the pin 58
Rotation of the first carrier 55 by abutment stops. At the position where the rotation of the first carrier 55 is stopped, the small planetary gear 53 is rotating while the first sun gear 52 is rotating in the direction of the arrow 50b.
b keeps spinning.

The gear 60 meshing with the first sun gear 52 and the second sun gear 61 are fixed to the shaft 59. A second planetary gear 62 that meshes with the second sun gear 61 is supported by a second carrier 63 that rotates freely around a shaft 59.
Since the second planetary gear 62 is pressed against one arm member 63a of the second carrier with a predetermined pressure by a spring 64, a constant load is applied to the rotation of the second planetary gear 62.

In FIG. 1 and FIG.
The gear 60, the shaft 59, and the second sun gear 6 are rotated by the rotation in the direction a.
1 rotates in the direction of arrow 59a, and in response to this rotation, the second carrier 63 moves together with the second planetary gear 62 in the direction of arrow 5a.
The second carrier 63 rotates in the direction 9a, and stops when the carrier arm member 63a finally comes into contact with the pin 65. When the second carrier 63 is stationary, the sun gear 61
The second planetary gear 62 continues idling by the subsequent rotation of.

In FIG. 1 and FIG.
By rotation in the direction 7b, the sun gear 61 rotates in the direction of the arrow 59b, and in response to this rotation, the second carrier 63
Similarly, the planetary gear 62 rotates in the direction of arrow 59b, and finally the second planetary gear 62 meshes with the toothless gear 57. Therefore, the rotation of the second sun gear 61 in the direction of arrow 59b is transmitted through the shaft 8 through the feed roller 9 To the feed direction 8a.

The rotation of the gear 57 by the driving of the second planetary gear 62 advances, and the toothless portion 57 a of the gear 57 is moved to the second planetary gear 62.
The second planetary gear 62 idles and cuts off the transmission to the gear 57.

At a predetermined angle α in a so-called non-interlocking process region where the second planetary gear 62 does not mesh with the toothless gear 57 in the entire revolution angle region where the second planetary gear 62 revolves around the second sun gear 61. The second planetary gear meshes with the internal gear 66. Due to this meshing, the second planetary gear 62 revolves around the second sun gear 61 while rotating.

In FIG. 1, when the pump 43 is operated by a predetermined amount of forward / reverse rotation of the motor M, the non-interlocking process area is provided so that the gear 57 and the second planetary gear 62 do not mesh with each other.

In this embodiment, when the motor M rotates by a predetermined amount necessary for performing the above operation, the angle as the uncoupled process area is required to be 360 °, and the second planetary gear is provided without the internal gear 66. If 62 does not rotate but only revolves, 3
It is not possible to set a 60 ° uncoupled process area.

Accordingly, the provision of the internal gear 66 allows the second planetary gear 61 to rotate on its own axis and reduce the revolution speed, thereby enabling the non-interlocking process area to be set. This will be described. Assuming that the number of teeth of the second sun gear 61 is Z ₁ , the number of teeth of the second planetary gear 62 is Z ₂ , and the number of teeth of the internal gear 66 is Z ₃ , the relation is Z ₃ = Z ₁ + 2Z ₂ .

Therefore, the reduction ratio between Z ₁ and Z ₃ is Z ₁ / Z ₃ = 1/1 + 2 (Z ₂ / Z ₁ ). That is, when the second sun gear 61 rotates the angle region where the teeth of the internal gear 66 are provided by α degrees, the second planetary gear 62
Will perform a revolution of α / 1 + 2 (Z ₁ / Z ₂ ) degrees,
The revolution speed is greatly reduced.

For example, α = 120 °, Z ₁ = 10, Z ₂ = 1
If 0, the revolution angle β of the second planetary gear 62 is β = 120
° / 3 = 40 °.

On the other hand, in order for the second planetary gear 62 to revolve at 120 °, the second sun gear 61 needs to be 120 ° × 3 = 36.
This means that the rotation is performed at 0 °, so that the required uncoupled process area can be set at 120 °.

Next, a feeding operation and a print recording operation in the first embodiment will be described with reference to FIGS. 1 to 4 and FIGS. 5 to 8 are cross-sectional views showing main components for feeding the sheet material in FIG.

First, as an initialization operation, when the power supply of the apparatus is turned on, the motor M shown in FIG.
7a, that is, the conveying roller 13 moves the sheet material S in FIG.
3 and 5, the rotation of the motor M shown in FIGS. 3 and 5 is not transmitted to the feeding roller 9, and the sheet transmission unit Is in the state shown in FIG.

In FIG. 5, the stop position lift surface 7b of the drive cam 7 and the follower portion 4 provided on the sheet loading table 4 are shown.
In a state where b is engaged by the force of the spring 5, the sheet material mounting table 4 is stationary at a position where it has moved downward. In this state, a plurality of sheet materials S are placed on the sheet material mounting table 4 with their leading ends abutting below the contact member 10.

4 and 6, when the motor M is rotated by a predetermined amount in the direction of arrow 47b in response to a feed command from the controller 34, the second planetary gear 62 is moved to the position where the second carrier 63 and the pin 65 abut. From the gear to the meshing position with the gear 57. The second planetary gear 6 that has come to this meshing position
2 transmits the rotation of the motor M in the direction of the arrow 47b to the gear 57, so that the feed roller 9 starts rotating in the direction of the arrow 8a, that is, in the feed direction through the shaft 8.

On the other hand, the first planetary gear 53 rotates around the first sun gear 52 in the direction of the arrow 50b by the rotation of the motor M in the direction of the arrow 47b, and moves away from the meshing position with the gear 57.

The rotation of the gear 57 causes the drive cam 7 fixed to the shaft 8 to rotate in the direction of the arrow 8a, so that the stop surface at the stop position of the drive cam 7 and the follower portion 4b provided on the sheet material loading table 4 are connected. The engagement is released, and subsequently, the sheet material mounting table 4 is raised by the tensile force of the spring 5.

The uppermost sheet material S ₁ of the plurality of sheet materials S is moved by the raising of the sheet material mounting table 4 so that the rotating feeding roller 9 is rotated.
The uppermost sheet material S ₁ is in contact with the contact member 1
It is fed in the zero direction. The contact member 10 applied to the moving sheet material S changes its angle in the traveling direction of the sheet material due to the moving force of the sheet material S.

FIG. 7 shows that, in FIG. 6, the feed roller 9 further rotates, the uppermost sheet material S ₁ further moves, and the leading end of the contact member 10 and the leading end of the sheet S ₁ coincide. Indicates that they are in a balanced state. The two feed rollers 9 on the left and right are made of chloroprene rubber, nitrile rubber, silicon rubber, or the like having a high coefficient of friction, and a plurality of sheet materials S loaded on the sheet material mounting table 4 are pressed by the force of the spring 5 with a pressing force F ₀ . It is pressed against the individual feeding rollers 9.

The friction coefficient of μ ₁ between the feeding roller 9 and the sheet material S ₁ is determined. Next, the friction coefficient of μ ₂ is determined between the sheet material S ₁ and the second sheet material S _2. Furthermore, the friction coefficient between the sheet material S ₂ and the third sheet material S ₃ is μ ₃ , and the fourth and subsequent sheet materials also have a predetermined friction coefficient.

The friction coefficients μ ₁ and μ ₂ have a relationship of μ ₁ ≫μ ₂ . Accordingly, when a plurality of sheet materials S stacked on the sheet material mounting table 4 are pressed against the surface of the feeding roller 9 by the force of the spring 5 with the pressing force of F ₀ , the uppermost sheet material S ₁
Is applied to the contact member 10 with a moving force F ₁ of F ₁ = F ₀ (μ ₁ −μ ₂ ). On the other hand, the moving force F ₂ of the second and subsequent sheet materials is F ₂ = F
Since (μ ₂ −μ ₃ ), μ ₂ ≒ μ _{3, the} value is smaller than F ₁ .

Here, the contact member 1 will be described with reference to FIG.
The first separating operation of 0 will be described.

The contact member 10 is the uppermost sheet material S _1.
The lower end of the contacting member 10 is fixed to the guide member 11 in a state of 10a inclined toward the feed roller 9 by α degrees from the perpendicular 68 to the feed direction 67 in the state of S ₁ -a.

[0054] Per per abutment member in the state shown in the sheet S ₁ is 10a at the position of the point 10c, further abutting member 10 attached by the moving force F ₁ described in FIG. 7 occurs <br/> angular change α in the process consisting of 10a in a state of 10b Te, the sheet _{S 1} is in a state of _S 1 -b from the state of _S 1 -a. Abutment a distance between the bent portion 10e of the position 10c Like abutment member 10 of the member 10 and _{L 1,} abutment member 10 is 10a when the state of 10b 10c of the position of the state is 10d of And the amount of change in the vertical direction 68 from 10c at 10d is represented by T
Then, T = L ₁ (1−cos α). On the other hand, the moving force F acting on the second and subsequent sheet materials S ₂ , S ₃ ,.
₂ component force F _9, F ₁₀ serves to press the sheet S ₂ following the tip to the surface of the sheet material stacking plate 4.

At the respective leading ends of the sheet material S ₁ and the sheet material S ₂ or less, the sheet material S ₂ or less is pressed between the sheet material S ₁ and the sheet material S ₂ while being pressed against the surface of the sheet material loading table 4. The occurrence of the separation amount T is referred to as a first separation action.

The first separating action has the following excellent effects. The first of the effect, with respect to the direction 67 of the sheet S ₁ is moved from a state of S ₁ -a, a pressure member 10 per position 10b in the vertical direction 68 is fixed, abutment member 10 is 10b of At the angle change β from the position, the leading end of the sheet material S ₁ is shifted from the state of S ₁ -a.
Suppose you start sliding on the surface. On the other hand, the contact member 1
0 is the same as the sheet material S ₁ from the position of 10a S ₁ -b
In this state, the change in the angle at which the tip starts to slide on the surface of the contact member 10 becomes β-γ, which is smaller than β at which the contact member changes its angle from the position of 10b. When you start sliding surface of the pressure member 10 attaches the sheet S ₁ of the highest in beta-gamma becomes the value, the sheet material of the second or subsequent S _2, S _3, ... is the surface of the abutment member 10 abutting the further .. are smaller than β−γ, so that the sheet materials S ₂ , S ₃ ,.

Further, the second and subsequent sheet materials S ₂ , S ₃ ,...
Hits per contact member 10 attached with moving force F ₁ is smaller than the moving force F ₂ of the sheet S _1. Component force F _9, F ₁₀ of the moving force F against member 10 the angle change sheet material 2 and subsequent sheets in the course of performing alpha S ₂ For the _1, S ₃ of the sheet S ₁ F ₂ is The second and subsequent sheets S ₂ , S ₃ , ...
Prevents the first sheet material S ₁ from performing the first separating action together with the upper sheet material S _1.
The so-called double feed in which the subsequent sheets S ₂ , S ₃ ,... Are taken out is reliably prevented.

The first separating action is particularly effective for separating a thin sheet material, for example, a so-called weak sheet material having a paper thickness of about 0.065 mm.

The magnitude of the angle α at which the first separating action is performed depends on the length L _{1 of} the contact member 10, the bending elastic modulus of the contact member 10, and the like. It is preferable to set the angle in the range of 5 ° to 35 °.

The second effect of the first separating operation is that when the feeding of the sheet material S ₁ is completed and the loading table 4 is subsequently lowered to remove the pressing force on the upper surface of the sheet material S, two sheets are removed. The force of the contact member 10 acting on the leading ends of the sheet materials S ₂ , S ₃ ,... To return the sheet material S to the set position shown in FIG.
Since the position 10a closer to the feed roller 9 is stronger than the position 0b, the operation of the contact member 10 to pull back the sheet materials S ₂ , S ₃ ,... Is surely performed.

In FIG. 7, the uppermost sheet material S ₁ is F ₃
= F ₁ cos A ₁ consisting given change of A ₂ + A ₃ consisting angle of 10a in a position to contact member 10 per said with a force, the tip point 69 of the sheet S ₁ and the abutment member 10 at that time
In a state commensurate with the elastic force of each other in the movement of the sheet S ₁ considered to be stopped.

[0062] force of F ₃ press the pressure member 10 attaches the sheet S _{1, 4} the friction coefficient μ of the tip and abutment member 10 of the sheet S _1, the tangent 70 at the point 69 of the sheet S ₁ the with Assuming that the angle formed by the tangent line 71 at the point 69 of the contact member 10 is θ °, F ₄ = F ₃ cos θ ° F ₅ = F ₃ sin θ ° (1) F ₆ = μ ₄ F ₃ sin θ ° Therefore, F ₄ -F _{6> 0 F 3 (1-} μ 4 tanθ °)> 0 θ °> tan -1 1 / μ 4 ... (2) comprising sheet material S ₁ at theta ° is sliding out the surface of the pressure member 10 month.

A perpendicular 73 from the feed direction 72 passing through the point 69
A ₁ r is the angle between the tangent 70 and the perpendicular 74 from the point 69.
When ad sheet S ₁ is ^{_{A 1 ≒ F8L 2 2 K 1}} ... (3) K 1 = 1/2 × E 1 × I 1 ... (3) ' However K ₁ = elasticity of A ₁ of the sheet S ₁ = that flexed in the deflection angle (rad) _{L 2} = become the second moment of the flexure length E ₁ = Young sheet S ₁ ratio I ₁ = sheet S ₁ sheet S ₁ angle of the sheet S _{1 becomes, F 5 '= F 5 =} F 8 cosA 1 ° ( where _{a 1 ° = a 1 × 180} ° / π) ... a (4) by the balance.

The angle formed by the perpendicular 73 and the tangent 71 is A ₂ r
elasticity of the contact member 10 attached to the _{ad A 2 ≒ F 7 L 3} 2 K 2 ... (5) K 2 = 1/2 × E 2 × I 2 × n ... (5a) provided that K ₂ = abutment member 10 Degree A ₂ = Deflection angle (rad) of contact member 10 L ₃ = Deflection length of contact member 10 E ₂ = Young's modulus of contact member 10 I ₂ = Second moment of area of contact member 10 n = Contact The number of members 10 (in this embodiment, n =
By being flexed in 2) becomes angles, and F ₅ = F ₇ cosA ₂ ° by the balance (except _{A 2 ° = A 2 × 180} ° / π) ... (6).

On the other hand, the angle formed by the line segment 75 and the tangent line 70 orthogonal to the perpendicular 73 and the point 69 is A ₁ °, and the angle formed by the line segment 75 and the line segment 76 orthogonal to the tangent line 71 is A ₂ °
From the above relationship, θ ° + A ₁ ° + A ₂ ° ≒ 90 ° (= π / 2 rad) (7)

From equations (1), (4) and (6), F ₃ in a balanced state is F ₃ sin θ ° = F ₈ cos A ₁ ° = F
_{From the} relationship of ₇ cosA ₂ °, F ₃ = F ₈ cosA ₁ ° / sin θ ° = F ₇ cosA ₂ ° / sin θ ° (8) Therefore, the moving force larger than F ₃ obtained from the above equation (6) is obtained. sheet S ₁ when applied to the sheet material S ₁ of the tip abutment sheet S ₂ exits from the distal end of the second or subsequent member 10 by 9, S _3, is completely separated from .... This separating action is called a second separating action.

If θ ° is a value determined only from the friction coefficient μ ₄ from equation (2), then from equation (5), A ₁ ° + A ₂ ° ≒ 90 ° -θ ° = constant ... (9)

The value of the elasticity K ₁ of the sheet material S ₁ constituting the equation (3) varies greatly depending on the type of the sheet material S. For example, if the elasticity of thin paper having a thickness of 0.065 mm is K ₁ -a and the elasticity of a postcard or an envelope is K ₁ -b, K ₁ -b / K ₁ -a ≒ 13 (10).

In the equation (9), θ ° at which the second separation is performed is A ₁ ° ≫A ₂ ° for thin paper. That is, the separation angle of the sheet material itself greatly contributes to separation of thin paper.

On the other hand, thick paper such as a postcard satisfies A ₁ ° ≧ A ₂ °. That is, the deflection angle of the contact member 10 greatly contributes to separation. When performing the separating operation, it is necessary to reduce the value of A ₂ ° in equation (9) as much as possible in order to prevent double feed of the second and subsequent sheets. A ₁ ° in equation (3)
The above (10) effects the value of the deflection length L ₂ of the thing vary greatly depending on the value of K ₁ but on the other hand the sheet S varies with the square for the deflection angle A ₁ by its suitability set (10) of such hits the formula Can be reduced.

[0071] As you increase the L ₂ thick paper is an advantage of being larger deflection angle A ₁ thin paper double-feed tends also deflection second and subsequent sheets of paper occurs. L ₂ it is the small and advantageous to go when the thin paper made small deflection angle A ₁ and although the double feed in thick deflection angle A ₂ is increased and the second and subsequent sheets of paper abutment member 10 for paper is difficult to bend Get up. In the range indicated above degree of elasticity K ₁ of the sheet material S from the result (10), it was possible second separation is good to set between L 2 ₌ 15 to 25 mm.

In FIG. 6, the leading end of the sheet material S ₁ that has escaped from the leading end of the abutting member 10 is guided upward by the inclined surface 11 a of the guide member 11, and
₁ tip rises, moves the tip of the sheet S ₁ by the rise and subsequently conveying rollers 13 beyond the apex 11b in the direction of the contact position of the first pinch roller 16.

Next, the correction of the skew of the separated and fed sheet material will be described.

In FIG. 9, when the leading end of the separated sheet material crosses the photo sensor PH, the photo sensor PH generates a signal. Based on this signal, the controller 34 in FIG. 2 controls the motor M to move the distance L ₅ + α (α). = Margin = 2
５5 mm), and then stop once after rotating for the number of pulses P ₄ equivalent to the number of pulses. The leading end of the sheet material S ₁ by the feed roller 9 which operates in response to the rotation of the speed of the pulse motor P _4, arrow 49b
Roller 13 and first pinch roller 16 rotating in the reverse direction
Devoted per contact position 77, the tip movement of the sheet S ₁ is prevented.

If the feeding roller 9 is still rotating while the movement of the sheet material S ₁ is stopped, the feeding roller 9 rotates while slipping on the upper surface of the sheet material S ₁ .

When the sheet material S ₁ is skewed, one of the leading ends first comes into contact with the contact position 77 and the movement of one of the leading ends is stopped, but the other leading end moves. Rotate around one end. The leading end of the sheet material S ₁ by the rotation skew is corrected by aligned parallel to the contact position over its entire width.

After the rotation of the motor having the pulse number of P ₄ , the motor M performs the forward rotation in the direction of the arrow 47 a with the pulse number of P ₅ corresponding to the distance L ₆ carried by the carrying roller 13 (from FIG. 4). FIG. 3). Roller 9 feeds the rotation number of pulses P ₅ of the motor M is performed further rotation pushing the leading edge of the sheet S ₁ to the contact position 77, the leading end of the sheet S ₁ which is pushed in the arrow of the conveying roller 13 49b is conveyed by the rotation of the reverse direction until the distance L ₆ is a.

Referring to FIGS. 9 and 24, a description will be given of means for correcting a feeding failure and a recording position failure. FIG. 24 is a flow chart showing the operation of the feeding device. In the figure, the symbol + (plus) in the figure indicates the forward rotation of the motor M in the direction of the arrow 47a, and the symbol (-) indicates the direction of the motor 47 in the direction of the arrow 47b. It represents reverse rotation. The numbers in parentheses outside the frame indicate the number of steps in the control procedure of the computer in the control circuit 34. The feeding roller 9 and the transport roller 1
A pulse drive motor is used for the motor M in FIG.

In FIGS. 9 and 24, the number of rotation pulses of the motor M at each step is: P ₁ = number of pulses required for the second planetary gear 61 to make a revolution of A ₅ ° P ₂ = missing tooth position of the gear 57 There pulse number P ₃ = feeding roller 9 the distance _{L 4 + α (α = 2~5mm} ) corresponding, which corresponds to an angle a ₄ ° rotating the engagement position of the first planetary gear 53 until the meshing position of the second planetary gear 61 P ₄ = number of pulses corresponding to the rotation of the feeding roller 9 = number of pulses corresponding to the rotation of the feeding roller 9 corresponding to the distance L ₅ + α (α = 2 to ₅ mm) P ₅ = the distance L _{6 of the} conveying roller 13 pulse number P ₆ = transport rollers 13 corresponding to the rotation of the corresponding is number of pulses corresponding to conveying the twice the amount of longitudinal length of the sheet material of the maximum size within the operating range.

The operation procedure of the motor M will be described with reference to FIG. In step (1), the rotation of the motor M is stopped at the same time as the second planetary gear 61 is engaged with the gear 57 by the motor M that has started rotating at the start. Then, the motor M is loop the count value T of the counter in step (3) during step (2) and Step (5) is reversed until the P _2. When the photo sensor PH is turned on in step (4) during the reverse rotation of the motor M, the value of the count value T is checked in step (6).

[0081] Step (6) at T <that it P ₃ Step (7) to go the leading edge of the sheet material S ₁ is per sheet S ₁ per contact position between the conveying roller 13 in the reverse first pinch roller 16 obliquely Row correction is performed.

Next, in step (8), the motor M rotates forward,
The leading end of the sheet material S ₁ is conveyed to a predetermined recording position L _6.
From now on, the sheet material S ₁ is recorded by the recording operation described later.
The image is recorded on the.

If it is determined in step (6) that T> P ₃ , even if the operation in step (7) is performed, the sheet material S
It may happen that the tip of ₁ does not hit the contact position 77. In other words, when T> P _{3 in a} relationship of P ₂ = P ₃ + P ₄ , the missing tooth portion 57a of the gear 57 is shifted to the second planet during the rotation of the number of pulses of P ₄ of the motor M as shown in FIG. to come engagement position with the gear 61, the rotation feeding roller 9 is stopped, the feed roller 9 does not feed the only sheet material amount less than the pulse number of the P _4. Such a phenomenon occurs, for example, in the case of a sheet material having a low friction coefficient
Occurs when the sheet material is fed while the feeding roller 9 slips due to a decrease in the feeding force of the sheet material.

[0084] If it is determined that T> P ₃ in step (6), Step (9) After the elaborate addition once the transport roller 13 of the sheet material leading end performs steps (10), the conveying rollers in step (11) P _{When the} pulse number is reversed by the same number as ₅ , the sheet material S ₁ is returned to the feed roller side, and the leading end of the sheet material S ₁ stays close to the contact portion 77. Immediately after performing step (11), the process proceeds to step (1). Since the sheet S ₁ is already turned ON the photo sensor PH goes from step (4) to step (6), go to step (6) always T <P ₃ because step (7) in the subsequently step ( 8) to perform a normal recording operation.

If the photosensor PH does not turn on in step (4) even if T = P ₂ in step (5), the process proceeds to step (12) and the motor M is driven by P ₃ + P _4.
If the photo sensor PH is not turned on in step (13) after a considerable amount of forward rotation, it is determined that the sheet material is in a feed-disabled state upstream of the photo sensor PH, and the control mode is changed to the feed error mode. To

The controller 34 uses the LED light emitting display means and the liquid crystal display means provided on the operation electric board 33 shown in FIG. 2 to display the feeding failure, and generates a warning sound by a buzzer to cancel the error. Notify user. The user operates the sheet loading table 4 according to the error display.
The upper sheet material is pulled out, and it is confirmed that there is no problem such as breakage of the leading end of the sheet material. Then, the sheet material is put on the sheet material loading table 4 again to perform the feeding operation.

In step (13), the photo sensor P
If H is ON, _P in is determined that the leading end of the sheet _{S 1} is located downstream from the photosensor PH step (14) ₆
After the sheet material corresponding to the pulse number is completely discharged and conveyed out of the recording apparatus, the presence or absence of the sheet material is detected in step (15), and if the photo sensor PH is not ON, the discharge of the sheet material is completed. Judgment has been made, and the sheet can be fed again.

On the other hand, when the photo sensor PH is ON, it is determined that the sheet material is caught at some position downstream of the photo sensor PH and cannot be discharged by the rotation of the (jam) transport roller. Set the control mode to feeding error. In accordance with the feed error display, the user pulls out the sheet material from the inside of the apparatus, confirms that there is no problem such as breakage of the sheet front end, places the sheet material on the sheet material mounting table 4 again, and resumes the feeding operation. .

Next, a description will be given conveyance of the sheet material after correcting skew of the sheet S _1.

The controller 34 rotates the output gear 47 of the motor M in the direction of arrow 47a in FIG. 1 according to the total number of drive pulses _{PT of the} motor M and the passing signal of the sheet S generated by the photosensor PH.

In FIG. 10, the conveyance roller 13 is rotated in the direction of arrow 49a by the rotation of the gear 47. On the other hand, at the same time, the first carrier 55 rotates about the shaft 50 in the direction of the arrow 50a, so that the small planetary gear 53b of the first planetary gear 53
And the gear 57 mesh instantaneously. The feeding roller 9 by engagement pushes the leading end of the sheet S ₁ by rotating the feeding direction to the contact position 77 of the conveying roller 13 and the first pinch roller 16. The leading end of the pushed sheet material S ₁ passes through the contact position 77 by the rotation of the transport roller 13.

[0092] Since the roller 9 feeding during fed until the sheet S ₁ is passed through the contact position 77 is rotated while holding the upper surface of the sheet S, as described in FIG. 7, the second sheet following the sheet material S _2, S _3, sufficiently small moving force F ₂ acts from F ₁ to ..., angular change in abutment member 10 is performed by the moving force F ₂ is in that abuts against the abutting member 10 attaches the sheet S ₂ Since θ ° constituting the equation (2) is θ ° ≧ tan ⁻¹ 1 / μ ₄ (11), the front ends of the second and lower sheet materials S ₂ , S ₃ ,. Therefore, the leading end of the sheet material does not exceed the leading end of the contact member.

On the shaft 8, the gear 57, the driving cam 7, and the feeding roller 9 are integrated with each other in a state where the relative phase relationship is maintained constant in each direction. The drive cam 7 has a drive lift surface 7a, a maximum lift surface 7b, a stop position lift surface 7d having a smaller lift amount than the maximum lift surface 7b, and an inclined surface 7c connecting the maximum lift surface 7b and the stop position lift surface 7d. have.

The rotation of the small planetary gear 53b of the first planetary gear 53 causes the driving cam 7 to move through the gear 57 and the shaft 8 by the arrow 8a.
Rotate in the direction. During this rotation, the drive lift surface 7a and the follower portions 46 provided at the left and right ends of the sheet material loading table 4 abut against each other, and the rotation of the driving cam 7 causes the sheet material loading table 4 to rotate about the shaft 4a. Rotate downward against force.

When the sheet loading table 4 is rotated in the downward direction, the upper portion of the sheet S is released from being pressed by the force of the spring 5 by the feed roller 9 and is released from any pressing force. Therefore, the second and subsequent sheet materials S ₂ , S ₃ ,...
Of the second and subsequent sheets S ₂ , S ₃ ... Due to the restoring force of the abutment member 10.
While moving in the reverse feeding direction, the sheet moves downward following the downward rotation of the sheet material stacking table 4.

Since the second and subsequent sheet members S ₂ , S _3, ... Move away from the surface of the contact member 10 on which the sheet member comes in contact, the change in the angle of the contact member 10 is the first angle change. Return to the state without. In this way, the load related to the contact member 10 is released.

In the state shown in FIG. 11 in which the force for pressing the upper surface of the sheet material S is released, the vertex 1
Sheet S ₁ is being restricted from sagging downward from a predetermined position by 1b. That is, the regulated sheet material S
_A predetermined gap 7 between the lower surface of
The positions of the apex 11b and the tip of the contacting member 10 are appropriately set so as to make 8.

[0098] By providing the gap 78, the tip of the abutment member 10 in the process of abutment member 10 returns to the absence of the first angle change is without interference from the sheet material S _1, thus returning operation reliably Can be done. Also by providing the gap 78, to generate abnormal noise interferes with the pressure member 10 per during movement of the sheet material S ₁ the uppermost is prevented.

[0099] As a sheet material feeding means, the feeding roller 9 composed of a long radius portion and a short radius portion rotates while contacting the sheet material by a high friction surface such as rubber on the surface of the long radius portion. After the sheet material is sent out, the short radius portion is made to face the upper surface of the sheet material. Since the short radius portion has a flange portion 9a made of a low friction material protruding and the high friction surface is buried, the sheet material is sent out, the transport roller 13 starts transporting, and the short radius portion faces the upper surface of the sheet material. The amount of deflection of the sheet material is reduced by the difference between the lengths of the long and short radius portions, and at the same time, part of the flange portion 9a contacts the upper surface of the sheet material being conveyed to prevent the sheet material from rising. Guide the transport while At this time,
Since the flange portion 9a is formed from a low friction material,
The resistance at the time of conveying the sheet material decreases, and the fluctuation of the load applied to the motor M, which is the driving source of the conveying roller 13, also decreases, so that the accuracy of conveying the sheet material by the conveying roller 13 improves.

11 and 12, the maximum lift surface 7b of the drive cam 7 passes through the contact portion 46a of the follower portion 4b, and at the same time, the toothless portion 57a of the gear 57 is connected to the small planet gear 53b of the first planet gear 53. Come to the meshing position of
The rotation transmission to the gear 57 by the small planetary gear 53b is cut off, and the rotation of the gear 57 and the feed roller 9 stops.

[0102] min to the inclined surface 7c the rotation of the first planetary gear 53b of the gear 57 is abutting portion 46a of the stop after follower portion 4b presses the inclined surface 7c of the drive cam 7 by a force _{F 1} 1 spring 5 The force F ₁₂ acts to drive the cam 7 and the gear 5
7 rotates a small amount in the direction of arrow 8a, and when the contact portion 46a slides on the inclined surface 7c and reaches the position of the stop position lift surface 7d of the drive cam 7, the rotation of the drive cam 7 stops.

The lift surface 7d of the drive cam 7 and the abutment portion 46a of the follower portion 4b are formed in an arc shape having substantially the same radius, and stop by being fitted. At this time, the force (spring 5) applied to the drive cam 7 from the follower portion 4b
Is the direction toward the axis of the shaft 8 (arrow in FIG. 12).
, And is reliably stopped by friction between the lift surface 7d and the contact portion 46a.

In FIG. 12, when the contact portion 46a is at the stop position lift surface 7d, the phase of the toothless portion 57d of the gear 57 becomes the small planetary gear 53b of the first planetary gear 53 and the phase of the toothless portion 57d.
a is slightly advanced from the position where the meshing was interrupted. In this way, by advancing the phase of the toothless gear by a predetermined amount, the teeth near the toothless portion of the gear 57 are completely retracted from the position where they mesh with the teeth of the small planetary gear 53b. The interference between the teeth is completely eliminated, so that the problem of vibration and abnormal noise caused by the interference between the teeth can be eliminated. The drive cam 7 and the follower portion 4b
May be reversed. That is, the drive cam 7 side may have a convex shape, and the follower portion 4b may have a concave shape.

In FIG. 12, when the motor M rotates by the number of pulses P ₄ corresponding to the distance L ₆ , the leading end of the sheet material S ₁ moves from the contact position 77 to a position advanced by L _6.
3 transported. The length L ₆ is set to the controller 3 so that the printing position of the head nozzle of the ink ejection section 27 a of the recording head 27 is a predetermined length L ₇ from the leading end of the sheet material S _1.
4 is set.

[0105] The user may, for example 1.5 mm, it is possible to instruct the printer controller 34 through the computer the values of L ₇ of Toka 3mm and is connected to the recording apparatus.

Here, while the feeding roller 9 and the conveying roller 13 convey the leading end of the sheet material S ₁ to the position L ₆ , the contact portion 46 a of the follower portion 46 must be at the stop position lift surface of the driving cam 7. It must be in contact at position 7a. Figure If when uncertainty abutment of the abutment portion 46a and the lift surface 7a by reducing the length L ₇ comes in 12, first the length L was set L ₇ sufficiently large value ₆ is carried out, and then the conveying roller 13 is rotated in the reverse direction to carry out reverse feeding of a predetermined length L ₁₃ (L ₆ > L ₁₃ ). ₁₄ forwards.

[0107] The above mentioned way the operation and the lift surface 7a becomes possible to change the print position length L ₁₄ arbitrarily keep iterator constant length L ₆ of the contact portion 46a of the follower portion 46 The contact is ensured.

[0108] Positive feed by performing the length L ₁₄ after reverse feeding was performed in Matanaga of L _13, conveying the rotation of the motor M roller 1
Backlash gear means for transmitting the 3 are those capable of very small 0, conveyance accuracy variation of the transfer for the recording carried out after conveying of the conveying roller 13 the length L _14.

In FIG. 1 and FIG.
Controller 34 while the top of the printing position until the fed sheet S ₁ reciprocates the carriage 27 in the main scanning direction
Indicated by recording the predetermined image by ejecting ink from a discharge portion 27a of the recording head 27 onto the sheet S ₁ of the.
When recording of one line is completed, the controller 34 controls the motor M to feed the sheet material S one line in the sub-scanning direction.

Recording head 27 by [0110] It repeating the above operation is carried out the characters and images recorded over the entire surface of the sheet material S _1.

[0111] the sheet S ₁ when the sheet material S ₁ is to move in the sub-scanning direction by the conveying roller 13 is a major arc shape is regulated by the vertex 11b of the flange portion 9a and the guide member 11 of the feed roller 9 moving while rearward load during the rotation of the conveying roller 13 does not act only low contact resistance between the guide member 11 and the sheet material S ₁ is very small.
If this rearward load is extremely small, the fluctuation of the load applied to the motor M is also small, so that the conveyance accuracy of the conveyance roller 9 is improved, and as a result, the recording accuracy by the recording head 27 is also improved and the image quality is improved.

In FIG. 1, FIG. 2 and FIG.
_When the rear end of ₁ is detected by the photo sensor PH, the controller 34 predicts the length L ₈ from the detection position of the photo sensor PH to the rear end nozzle position of the ink ejection unit 27a, and records within the length L _8. made to perform a continuous rotation of a predetermined amount of conveying roller 13 and the discharge roller 20 after performing the recording by the head 27 to discharge the sheet S ₁ through the discharge opening 1b in FIG.

After a predetermined amount of continuous rotation of the discharge roller 20, the controller 34 performs the feeding operation of the next sheet material S when instructed by a computer connected to the recording apparatus.

[0114] In FIG 1, the thickness length of the second moment ^{_{Ia Ia = b 1 h 3/}} 12 ... (12) However b ₁ = width length of the sheet material Sa h = sheet Sa wide sheet Sa width Become.

[0115] second moment Ib of the sheet Sa and it is also the thickness the same homogenous the length of the width direction, for example 1/2 against Sa sheet Sb is ^{_{Ib = b 2 h 3/12}} = b 1 h ^3/2 × 12 = the Ia / 2 ... (13) However b ₂ = b _1/2 = the thickness length width length h = sheet Sb of the sheet Sb.

In the formulas (3) and (3) ′, I ₁ = Ia,
I ₁ = Ib and (13) by substituting the equation determining the relationship between the deflection angle Aa and sheet material Ab of the sheet Sa when _{Ab = 2Aa = F 8 L 2} 2 K 1 ... (14) thus Aa = (F ₈ / ₂₎ and ^{L 2 2} K _1.

In other words, in order to make Aa = Ab, the force F _{7 by} which the contact member 10 bends the sheet material b becomes F ₇ × (（) from the relations of equations (4) and (6). What should I do?

[0118] One method (5), (5) 'from the number of _{F 7 = A 2 × 2 ×} E 2 × I 2 × n / L 3 2 ... (15) next to the (15) abutment members 10 of the Force F to bend sheet material Sb by changing the value of n from 2 to 1
₇ can be halved.

In the above description, the example in which the number of the contact members 10 is two has been described. However, in the case where the number of the sheet members is large, the number of the contact members 10 is proportional to the number of the sheet material types. When the number is increased, the number of contact members that the sheet material contacts each time the size of the sheet material changes changes, and the relations of Expressions (13), (14), and (15) change. (2) Reliable separation can be achieved without a large change in the deflection angle Aa of the sheet material that performs the separating operation.

13 to 16, the contact member 10
Will be described. FIG. 13 is a perspective view showing a state in which the sheet material S has hit the contact member 10 having a rectangular shape.

In FIG. 13 and FIG. 14, the moving sheet material S hits the guide member 11 so as to be able to bend with the bending line 10e as a fulcrum. When a change is given, a phenomenon occurs in which the leading end Sc of the sheet material that contacts the central portion 10f of the contact member 10 bends downward. If the leading end Sc of the sheet material is bent, a loud noise may be generated when the leading end of the sheet material gets over the leading end of the contact member 10. Further, particularly in an environment with high humidity, the bent portion Sc may be bent downward, and the leading end Sc of the sheet material S may not be able to get over the leading end of the contact member 10 and may not be separated.

[0122] reaction forces more of the end 10g of the reaction force F ₁₃ is reaction force of the central portion 10f when the end portion Sc of the sheet S is deflected abuts with abutting member 10 attaches the sheet material S flex under F Because it is larger than ₁₄ .

FIG. 15 shows a shape in which the end Sc is prevented from sagging downward. A V-shaped notch is formed at the portion where the end Sc of the contact member 10 contacts. I have. In this V-shaped cutout shape, when the sheet material S hits the contact member 10, the end Sc of the sheet material S
It never ends Sc is bent down so does not receive a reaction force F ₁₃ in FIG. 13.

On the other hand, at the point 10i where the V-shaped ridge line 10h intersects with the tip of the sheet material S, the sheet material S shown in FIG.
Force F ₄ to slide surfaces of the tip abutment member 10 with the force F ₄
Work component force F ₁₅ of.

Assuming that the opening angle of the V-shape is 2A ₆ °, the component force F ₁₅ has a value of F ₁₅ = F ₄ / cos A ₆ ° (16) The leading edge of the sheet material S is increased to F ₁₅ direction while the upper ridge 10h sliding contact member 10 abut against the action of F _15. Be deflected under the distal end Sc of the sheet material is prevented by the leading end of the sheet S is increased to F ₁₅ direction, and a third between the leading edge of the sheet material S is increased while sliding on the ridge of the V-shaped Is performed, and the separating ability is further improved.

The third separating function works remarkably in a thin sheet material. As the angle A ₆ ° of the V-shape is reduced, the component force F ₁₅ is reduced according to the equation (16), and the third separating action works strongly. The portion Sc is likely to bend downward.

When the angle A ₆ ° is increased, the expression (16) is obtained.
Component force F ₁₅ is increased from the sheet material leading edge is also prone to multifeed increased third separating action is weakened in the second and subsequent sheets to become likely to increase. According to an experiment, it was found that the angle A ₆ ° was preferably in the range of 55 ° to 75 °. Note that a U-shaped notch may be used instead of the V-shaped notch.

In FIG. 15, the cross-sectional area of the contact member 10 at the cross-sectional position indicated by the arrow 80 decreases as the cross-sectional position increases, and the value of the second moment of area also decreases rapidly as the cross-sectional position increases. Since the cross-sectional area is reduced enough to go above equation _{(5), A 2 ≒ F} 7 L 3 K '2 of the V-shape than the elasticity K ₂ at ² K ₂ is increased and thus attached enough to go over The deflection angle A ′ ₂ at the tip of the contact member 10 is larger than A ₂ . Second separating action easier deflection angle A _'2 is as large as second and subsequent sheet material slipping is no longer reliable.

Referring to FIG. 16, a description will be given of a shape that solves the problem of the V-shape in FIG.

The length in the width direction at the upper end of the contact member 10 is represented by L _9, and the length in the width direction of the bending position 10 e is represented by L _10.
By making L ₉ > L _10, the cross-sectional area at the cross-sectional position as viewed in the direction of the arrow 80 is reduced so that the cross-sectional area changes at a smaller rate, thereby reducing the deflection angle A ′ at the tip of the contacting member 10. ₂ can approach A ₂ .

[0131] Also, when the length L ₉ in the width direction the leading end of the second and subsequent sheet S because the smaller toward the inflection point 10e direction moves downward, below the seat member S at point 10j resistance force F ₁₆ to prevent movement becomes easier movement decreases.

[0132] abutment the position 10e is provided with a plurality of holes 81 having a width dimension L ₁₁ on the line of position 10e to reduce the second moment of the bending position 10e of the member 10
The cross-sectional area on the line is reduced. The hole 81
May be replaced by a notch, or a combination of a hole and a notch. When the contacting member 10 easily bends at the bending position 10e, the bending angle at the tip of the contacting member 10 is not suddenly increased toward the leading end, and the second separating action is further improved.

[0133] Also, or to increase or decrease the value of the width dimension L ₁₁ in the width direction of the length L _9, and the L ₁₀ and the thickness t at a constant bore 81 of the pressure member 10 per, increasing or decreasing the number of holes 81 in may be in accordance with the deflection characteristics of the sheet material to be used to arbitrarily adjust the reaction force F ₁₄ in FIG. 13. Note the shape of the holes is also effective in if round or triangular long width dimension L ₁₁ are the same. The same effect can be obtained with the general rectangular shape shown in FIG.

In FIG. 16, a ridge 10k having an angle A ₇ ° smaller than the angle A ₆ ° opening in a V-shape at a position of a short length L ₁₂ below the upper end of the abutting member 10.
Since the sheet material S is further subjected to a stronger separating action at the ridge 10k than at the ridge 10h, the third separating action is further improved from the V-shape shown in FIG.

[0135] According to the experiment, the length L ₁₁ is 1.5mm~3
mm, angle A ₆ ° is 50 ° to 75 °, angle A ₇ ° is 0 ° ~
It is preferable to set the angle in a range of 40 °.

As the resin film used as the contact member 10, a resin film having a high heat deformation temperature, a low water absorption and a high bending strength, for example, polycarbonate or polyimide is suitable. The thickness is preferably set in the range of 0.07 mm to 0.3 mm.

(Second Embodiment) FIGS. 17 and 18 show a second embodiment.
FIG. 17 is a schematic view showing the mechanism of the present apparatus, and FIG. 18 is a cross-sectional view of the present apparatus. 17 and 18
In the figure, the same members and members having the same functions as those described in the first embodiment with reference to FIGS. 1 and 2 are denoted by the same reference numerals as those in FIGS. 1 and 2, and detailed description is omitted.

The second embodiment differs from the first embodiment mainly in that the sheet material mounting table 82 is immovably fixed to the side plate 3 and that an arm member that rotates about a shaft 83 is used. The paper feed roller 86 supported by the shaft 85 at the tip of the shaft 84 swings around the shaft 83, which will be described in detail.

17 and 18, a gear 57 having a toothless portion 57a, a cam member 87, and a gear 88 are fixed to the shaft 8. A gear 89 and a gear 90 are fixed to a shaft 83 rotatably provided on the side plate 3, and the gear 89 meshes with the gear 88. An arm member 84 in which a plurality of arm elements are integrated by a horizontal stay member 84a is rotatably provided on a shaft 83.

A shaft 85 is rotatably provided at the tip of the arm member 84, and a feed roller 86 made of rubber or the like and a gear 91 are fixed to the shaft 85. The gear 90 and the gear 91 are always meshed. The diameter of the feed roller 86 is smaller than that of the feed roller 9 of the first embodiment. Accordingly, the amount of sheet material fed by one gear 57 is reduced, so that the number of teeth of the gear 90 is made larger than the number of teeth of the gear 91 to secure the rotation amount of the feed roller 86.

The arm member 84 is biased in a clockwise direction by a spring hook 92b at one end and by a spring member 92 hooked at the other end to the horizontal stay member 84a while being fitted on the shaft 83. . Therefore, when the follower portion 84b provided on the arm member is disengaged from the cam member 87, the feed roller 86 in FIG. 18 swings until it comes into contact with the surface of the sheet material mounting table 82 as shown by a two-dot chain line. Perform the action.

Next, the feeding operation and the printing operation in the second embodiment will be described with reference to FIGS. 17, 18, and 19 to 23. 19 to 23 is a sectional view showing the main components for feeding the sheet material in Figure 17, the same members as the members shown in FIG. 17 in FIG. Are indicated by the same numbers.

In FIG. 18 and FIG.
At N, when the motor M shown in FIG. 17 rotates by a predetermined amount in the direction of the arrow 47a, that is, in the direction in which the conveying roller 13 sub-scans and conveys the sheet material S toward the discharge port 16, by the initialization operation command of the controller 34, the first planet Gear 5
3b idles at the toothless portion 57a of the gear 57, and the second planetary gear 62 has an arm 63a of the carrier 63 with a stopper pin 65
Idle at a position where the cam member 87 abuts, and a follower portion 8 provided on the stop position lift surface 87b of the cam member 87 and the arm member 84.
4b abuts, the arm member 84 rotates counterclockwise, and the feeding roller 86 is separated from the sheet stack 82, that is, the state shown in FIG.

In this state, a plurality of sheet materials S are inserted between the sheet material mounting table 82 and the feeding roller 86 and stacked on the sheet material mounting table 82.

In FIGS. 4 and 20, the controller 34 is used.
When the motor M is rotated by a predetermined amount in the direction of the arrow 47b according to the feed command, the second planetary gear 62 revolves from the position where the second carrier 63 and the pin 65 are in contact to the position where the second carrier 63 meshes with the gear 57.

The second planetary gear 62 that has reached the meshing position transmits the rotation of the motor M in the direction of the arrow 47b to the gear 57, so that it passes through the shaft 8, the gear 88, the gear 89, the shaft 83, the gear 90, the gear 91, and the shaft 85. The feeding roller 86 starts rotating in the feeding direction.

[0147] On the other hand, the cam member 87 is rotated by the rotation of the shaft 8, the locking lift position 87b and the roller 86 engaging the out feed of the follower portion 84b of the cam member to the sheet material S ₁ the uppermost contact, for feeding the sheet material S _1. The fed sheet material S ₁ hits the hitting member 10 and changes the angle of the hitting member 10. Sheet S ₁ overcame upper end of the contact member 10 attached subsequently be separated one by one by abutting member 10 attached to angle change until the second separation angle, is guided upwards further by the inclined surface 11a of the guide member 11 .

When the leading end of the sheet material separated in FIG. 20 crosses the photosensor PH, the photosensor PH generates a signal. Based on the signal, the controller 34 in FIG. 18 causes the motor M to move the distance L ₁₃ + α (α = Margin value =
2 to 5 mm) once stopped from performing reverse rotation of the equivalent number of pulses P _4.

[0149] leading end of the sheet S ₁ by a roller 86 which operates in response to the rotation of the pulse number of the motor of the P ₄ is abutted to the contact position 77 between the conveying roller 13 in reverse to the arrow 49b direction first pinch roller 16, the Movement of the tip is prevented. Feeding roller 86 when the feed roller 86 is still being rotated in a state where movement of the sheet material S ₁ is being blocked rotates while slipping the upper surface of the sheet S _1.

If the leading end of the sheet material S1 is skewed, _one of the leading ends comes into contact with the contact position 77 first and the movement of one of the leading ends is stopped, but the other leading end moves. The material rotates about one tip.

[0151] skew is aligned parallel to the contact position the tip of the sheet S ₁ by the rotation over its entire width is corrected.

[0152] After the number of pulses of rotation of the P _4, the motor M performs the forward rotation in the arrow 47a direction of the number of pulses distance L ₆ equivalent of P ₅ transported by the transport roller 13. Rollers 86 feed by rotation of the pulse number P ₅ of the motor M is in contact with the tip of the sheet S ₁ by performing a further rotation position 77
Press The leading end of the pushed sheet material S ₁ is transported to the distance L ₆ by the rotation of the transport roller 13 in the direction opposite to the arrow 49 b.

In FIGS. 20 and 24, the number of rotation pulses of the motor M at each step is P ₁ = the number of pulses required for the second planetary gear 61 to make a revolution of A ₅ ° P ₂ = the missing tooth position of the gear 57 There pulse number P ₃ = feeding roller 86 corresponding to an angle a ₄ ° rotating the engagement position of the first planetary gear 53 until the meshing position of the second planetary gear the distance L ₁₃ + α (α = 2~5m
m) Number of pulses corresponding to performing a corresponding rotation P ₄ = feeding roller 86 is at distance L ₁₄ + α (α = 2 to 5 m)
m) Number of pulses corresponding to performing a corresponding rotation P ₅ = Number of pulses corresponding to performing a corresponding rotation of the transport roller 13 to the distance L ₆ P ₆ = A sheet material having the maximum size within the range of use of the transport roller 13 The number of pulses is equivalent to transporting an amount twice as long as the length in the vertical direction.

The operation procedure of the motor M based on FIG. 24 is exactly the same as the procedure described in the first embodiment with reference to FIGS. 9 and 24, and will not be described here.

[0155] The controller 34 temporarily after stopping perform feeding of the motor M is the number of pulses rotation of P ₄ distance L _13, the conveying roller 13 in FIG. 21 rotates the motor M in the arrow 47a direction in FIG. 17 The first carrier 55 rotates in the direction of arrow 50a while the first planetary gear 53b meshes with the gear 57, so that the rotation of the motor M is transmitted to the feed roller 86 and the feed roller 86 Rotate. Conveying rollers 13 by the rotation of the feeding roller 86 the leading end of the sheet material S ₁ is rotating in the arrow 49a direction
Is pressed against the contact 77 of the first pinch roller 16, so that the leading end of the sheet material S ₁ passes through the contact 77.

The cam member 87 is also rotated by the rotation of the gear 57, and the drive lift surface 87a of the cam member 87 and the arm member 8
The four follower portions 84b are in contact with each other. When the cam member 87 further rotates the arm member 84 is allowed to separate the roller 86 and feeding rotated counterclockwise about the axis 83 from the plane of the sheet S _1.

Since the second carrier 63 rotates in the direction of the arrow 59a by the rotation of the motor M in the direction of the arrow 47a, the second planetary gear 62 separates from the meshing position with the gear 57 and revolves in the same direction of the arrow 59a.

In FIG. 22, when the maximum lift surface 87b of the drive cam 87 passes through the contact portion of the follower portion 84b, the toothless portion 57a of the gear 57 is brought into the meshing position with the small planetary gear 53b of the first planetary gear 53. Therefore, the rotation transmission to the gear 57 by the small planetary gear 53b is cut off, and the rotation of the gear 57 and the feed roller 86 is stopped.

Immediately after the rotation of the gear 57 by the first planetary gear 57b is stopped, the follower portion 84b is connected to the spring member 9 shown in FIG.
Since the inclined surface 87c of the drive cam 87 is pressed by the force of 2, the drive cam 87 rotates clockwise, and the gear 57 also rotates a small amount in conjunction with this rotation. In FIG. 23, when the follower portion 84b slides on the inclined surface 87c and reaches the position of the stop position lift surface 87d of the drive cam 87, the rotation of the drive cam 87 stops, and accordingly, the rotation of the gear 57 also stops.

By the small rotation of the gear 57, the phase of the stop position of the toothless portion 57a is advanced by a small amount, and the toothless portion 57a is completely retracted from the meshing position of the first planetary gear 53 with the small planetary gear 53b. This eliminates the problem that vibration and abnormal noise are generated due to interference between both teeth during the idling of 53b.

In FIGS. 22 and 23, the sheet material S ₁
When the feeding roller 86 which has been pressing the upper surface rotates clockwise sheet S ₂ of the second and subsequent sheets will easily move opened by the reverse feeding direction from the pressing force, restoration of the pressure member 10 per the sheet S ₂ of the second and subsequent sheets by the force to return to the original set position. In this way, the load applied to the contact member 10 is released. The second and subsequent sheets S ₂
Is always started from the set position, so that the angle change of the contacting member also starts from the set position, so that the same separating operation is always performed.

In FIG. 23, when the motor M rotates by the number of pulses P ₄ corresponding to the length L ₆ , the transport roller 13 rotates in the direction of the arrow 49 a to move the leading end of the sheet material S ₁ from the contact position 77 to the longer position. It is sent out to the position of L _6. Recording head 27
Printing position of the first nozzle of the ink discharge portion 27a is the length L ₆ to a predetermined length L ₇ is set.

Referring to FIG. 17 and FIG.
While the carriage 27 reciprocates in the main scanning direction on the upper surface of the sheet material S1 fed to the printing position of _No. 7, while the ink is ejected from the ejection portion 27a of the recording head 27 by the instruction of the controller 34, a predetermined character and recording an image on a sheet S _1.

When the recording of one line is completed, the controller 3
4 sends out one line the sheet material S ₁ by a predetermined rotation amount of the motor M in the arrow 47 direction. The recording head 27 by repeating the operation performs the characters and images recorded over the entire surface of the sheet material S _1.

[0165] 17, 18, 23, when the trailing edge of the sheet S ₁ is detected the photosensor PH controller 34 until the trailing edge nozzle position of the ink discharge portion 27a from the detection position of the photosensor PH to predict the length L _8,
The sheet material S from a discharge port 1b shown in conveying roller 13 and discharge roller 20 to perform the continuous rotation of a predetermined amount Figure 18 after performing the recording by the recording head 27 within the length L ₈
Discharge ₁

After the discharge roller 20 has been continuously rotated by a predetermined amount, the controller 34 performs the feeding operation of the next sheet material if instructed by a computer connected to the recording apparatus.

[0167]

As described above in detail, when the toothless portion of the feed gear comes out of engagement with the planetary gear,
A convex portion provided on the other of the cam member or the follower member along the inclined surface provided on one of the cam member or the follower member by the urging force of the elastic member for urging the sheet material loading table and the feeding roller to approach each other. By moving the feed gear by a predetermined amount in the rotational direction by moving the gear to prevent interference between the tooth portion of the feed gear and the planetary gear, generation of abnormal noise and vibration can be prevented. Also, damage to the teeth can be prevented.

[0168]

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a configuration of a recording apparatus including a sheet material feeding device according to the present invention.

FIG. 2 is a longitudinal sectional view of the recording apparatus shown in FIG.

FIG. 3 is a diagram showing a forward rotation state in the drive transmission mechanism of the sheet material feeding device of the present invention.

FIG. 4 is a diagram showing a reverse rotation state in the drive transmission mechanism of the sheet feeding apparatus of the present invention.

FIG. 5 is a side view showing a state before separation of the sheet feeding apparatus of the present invention.

FIG. 6 is a side view showing a state in which the sheet feeding apparatus of the present invention is being separated;

FIG. 7 is a side view showing a force relationship during separation of the sheet material feeding device of the present invention.

FIG. 8 is a side view showing a force relationship at the start of separation of the sheet material feeding device of the present invention.

FIG. 9 is a side view showing a sheet material feeding amount of the sheet material feeding device of the present invention.

FIG. 10 is a side view showing a state in which the drive transmission mechanism of the sheet feeding device according to the present invention has switched from a reverse rotation state to a normal rotation state.

FIG. 11 is a side view showing a state in which a sheet feeding member is separated from a feeding roller in the sheet feeding device of the present invention.

FIG. 12 is a side view showing a state in which the toothless portion of the gear is positioned after the feed roller and the sheet material are separated from each other in the sheet material feeding apparatus of the present invention.

FIG. 13 is a perspective view showing a state of a force when a sheet material comes into contact with a separation member provided in the sheet material feeding device of the present invention.

FIG. 14 is a front view of the view shown in FIG. 13;

FIG. 15 is a front view showing the shape of a separation member provided in the sheet feeding apparatus of the present invention.

FIG. 16 is a front view showing the shape of a separation member provided in the sheet feeding apparatus of the present invention.

FIG. 17 is a perspective view of a recording apparatus provided with another embodiment of the sheet feeding apparatus of the present invention.

18 is a longitudinal sectional view of the recording apparatus shown in FIG.

FIG. 19 is a side view showing a state before separation of the sheet material feeding apparatus according to the second embodiment of the present invention;

FIG. 20 is a side view showing a sheet material feeding amount of the sheet material feeding device according to the second embodiment of the present invention;

FIG. 21 is a side view showing a state in which the drive transmission mechanism of the sheet feeding apparatus according to the second embodiment of the present invention switches from a reverse rotation state to a normal rotation state;

FIG. 22 is a side view showing a state in which a sheet feeding roller is separated from a sheet material in the sheet material feeding apparatus according to the second embodiment of the present invention;

FIG. 23 is a side view illustrating cueing of a sheet material in the sheet material feeding device according to the second embodiment of the present invention;

FIG. 24 is a flowchart illustrating retry control in the sheet feeding apparatus of the present invention.

[Explanation of symbols]

 Reference Signs List 4 sheet material loading table (sheet material loading means) 5 spring (elastic member) 7 drive cam (cam member) 7c inclined surface (position changing means) 9 feeding roller (sheet material feeding rotating body) 10 attaching member (separation) Means 13 Conveying Roller (Conveying Means) 46 Follower Member 53 First Planetary Gear (Second Gear) 57 Gear (First Gear) 62 Second Planetary Gear

──────────────────────────────────────────────────続 き Continuing on the front page (72) Hideaki Kawakami 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Takeshi Iwasaki 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon (72) Inventor Hideki Yamaguchi 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Hiroyuki Inoue 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. ( 72) Inventor Hitoshi Nakamura 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Akira 3-30-2 Shimomaruko 3-chome, Ota-ku, Tokyo Canon Inc. (56) References JP-A-4-66425 (JP, A) JP-A-3-102019 (JP, A) JP-A-4-144484 (JP, A) JP-A-1-172140 (JP, A) JP-A-62-2 44827 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B65H 1/00-3/68

Claims (3)

(57) [Claims] 1. A sheet material stacking table for stacking a plurality of sheet materials, a feeding roller for feeding a sheet material in contact with the sheet material stacked on the sheet material loading table, and the feeding roller. A separating member for separating the fed sheet material,
An elastic member that urges the sheet material loading table and the feed roller in a direction to approach the sheet roller; and the sheet material loading table that is disposed on a rotation shaft of the feed roller and resists the urging force of the elastic member. A cam member that separates a feed roller, a follower member that is disposed on the sheet material stacking table and engages with the cam member,
An inclined surface provided in a concave portion provided on one of the cam member or the follower member, a convex portion provided on the other of the cam member or the follower member, and a drive for generating a driving force for driving the feed roller a source, a feed gear arranged on the rotation shaft of the feed roller, a planetary gear for transmitting the driving of the driving source meshes with the feed gear to said feed gear, said
It is arranged on the feed gear and the relative phase relationship with the cam member is constant
And a toothless portion maintained in said A recording apparatus transmitting the drive is disconnected from the planetary gear to the feed gear by the toothless portion, the said planetary gear by the toothless portion When the teeth of the feed gear are disengaged, the projection moves along the inclined surface by the biasing force of the elastic member, so that the feed gear is rotated by a predetermined amount in the rotational direction, and the feed gear is rotated. The cam member and the follower member are engaged with each other at a position where interference between the tooth portion and the planetary gear is prevented, so that the sheet material mounting table and the feed roller are kept separated from each other. Recording device. And a guide member that guides the sheet material downstream of the separation member, wherein the separation member is configured to supply the sheet material with respect to a perpendicular to a feeding direction of the sheet material stacked on the sheet material stacking table. The sheet fixed to the guide member in a state inclined to the feed roller side and fed by the feed roller
The angle with respect to the mounting part changes due to the
2. The recording apparatus according to claim 1, wherein the sheet material is separated into sheets . 3. The recording apparatus according to claim 1, wherein the recording means for performing recording on the sheet material is an ink jet recording head capable of discharging ink.