JPH07251964A - One full rotation clutch and paper feeding device using the clutch - Google Patents

Abstract

PURPOSE:To perform rapid correction of a screw of a paper sheet and to effect reliable paper feeding operation. CONSTITUTION:A paper feeding device using a one full rotation clutch comprises a toothed gear 140 rotated in the same direction as that of a paper feed roller 40, rotatably supported on a paper feed roller shaft 122, and provided at a side with a firs claw 141; and an oscillating body 160 having a second claw oscillatorily supported to a support body 150 fixed on the shaft 122 and engaged with and disengaged from the first claw 141 and a pin 164 movement of which is regulated by a lever 180. When movement of the pin 164 is regulated by the lever 180, the oscillating body 160 is oscillated in a direction in which a second claw is disengaged from the first claw 141 when movement of the pin 164 is regulated by the lever 180. Since, in a state that the second claw is positioned on the rotation orbit of the first claw 141, a space wherein the first claw 141 is separated away from the second claw is formed, a paper feed roller 40 is reversed without rotating the paper feed shaft 122.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-rotation clutch applicable to a printer, a copying machine and the like, and a sheet feeding apparatus using the same. In particular, the paper feed roller can be stopped when the paper feed roller is reversed 1
An object of the present invention is to provide a rotating clutch and a sheet feeding device that can quickly perform deskewing of a sheet and can perform a reliable sheet feeding operation by using the one rotation clutch. .

[0002]

2. Description of the Related Art Conventionally, a one-rotation clutch applied to a printer and a sheet feeding device using the same are disclosed in JP-A-3-15.
The one described in Japanese Patent No. 8328 is known.

A sheet feeding device using this one-rotation clutch will be described with reference to FIGS.

In FIG. 13, 1 is a paper feed roller having a D-shape in side view, 3 is a paper feed roller for feeding the paper S fed by the paper feed roller 1, and 4 is driven by being pressed against the paper feed roller 3. It is a gate roller.

As shown in FIGS. 12 and 14, a one-rotation clutch 2 is provided on the paper feed roller shaft 10.

This one-rotation clutch 2 includes a paper feed roller shaft 1
A gear 21 with a claw rotatably supported with respect to 0, and a disc-shaped support 23 fixed with respect to the paper feed roller shaft 10.
And a swing body 24 swingably supported with respect to the support body 23.

The gear 21 with pawls has a first pawl 22 on its side surface and is rotated by the power from the first planetary gear 18 or the intermediate gear 20.

The oscillating body 24 rotates integrally with the support body 23 around the paper feed roller shaft 10 and is engaged with and disengaged from the first pawl 22 of the gear 21 with pawls. It has a regulated portion 24b whose movement is regulated by a branch end 17a of the planetary lever 17.

A tension spring 25 is provided between the oscillating body 24 and the supporting body 23, and the first claw 22 and the second claw 22 are provided.
It is urged in the direction in which it engages with the claw 24a.

When the movement of the regulated portion 24b is regulated by the regulating means 17a (see FIG. 12 (c)),
The oscillating body 24 resists the urging force of the tension spring 25, and the second claw 24 a of the oscillating body 24 is the first claw 2 of the claw gear 21.
It swings relative to the support 23 in a direction away from 2.

In FIG. 12, reference numeral 5 is a planetary gear mechanism for actuating the one-turn clutch 2, which is driven by a pinion 11 of a motor.

Further, the pinion 11 meshes with a gear 13 fixed to the shaft of the paper feed roller 3 via a reduction gear 12, and rotationally drives the paper feed roller 3.

The operation of the one-rotation clutch and the sheet feeding device as described above is as follows.

(A) In the standby state, the motor is in the forward rotation or in the stopped state after the forward rotation. As shown in FIG. 12C, the branch end 17a of the planetary lever 17 comes into contact with the regulated portion 24b of the swing body to regulate the rotation of the support body 21,
As shown in FIG. 15A, the paper feed roller 1 is stopped in such a posture that it does not come into contact with the paper S.

(B) When the paper feed command signal is output by the sequence circuit of the printer, the motor is switched to reverse movement. Then, FIG. 12 (a) and FIG. 15 (b)
As shown in, the paper feed roller 3 rotates in the opposite paper feed direction.

On the other hand, the sun gear 15 and the planetary lever 17 of the planetary gear mechanism 5 rotate counterclockwise, and the planetary lever 1
The regulation of the rocking body 24 by the branch end 17a of 7 is released, the first claw 22 of the claw gear 21 and the second claw 24a of the rocking body 24 are engaged, and the first planetary gear 18 claws. It meshes with the attached gear 21. As a result, the support member 23 rotates, the paper feed roller 1 rotates, and the paper S moves the paper feed roller 3
Will be sent to.

That is, as shown in FIG. 15B, the paper S is fed toward the paper feed roller 3 which is rotating in the reverse direction.

(C) As shown in FIG. 15 (c), when the leading edge of the sheet S reaches the reversing sheet feed roller 3 and the gate roller 4, the passage is blocked, so that the sheet slacks. Occurs. Due to the restoring force at this time, the leading edge of the paper is pressed against the contact portion between the paper feed roller 3 and the gate roller 4, and when the paper is fed obliquely, this is corrected. That is, the skew of the sheet is removed.

(D) After the predetermined slack is formed, the motor rotates in the normal direction, and the paper feed roller 3 is rotated as shown in FIG. 15 (d).
Rotates in the paper feed direction to feed the paper. When the motor rotates in the normal direction, the sun gear 16 and the planetary lever 17 of the planetary gear mechanism 5 rotate clockwise as shown in FIG.
The first planetary gear 18 disengages from the gear 21 with pawls. Therefore, at this time, the paper feed roller 1 is stopped and the slack of the paper is removed (FIG. 15D).

(E) When the motor further rotates in the forward direction, the branched end 17a of the planetary lever 17 moves the regulated portion 2 of the rocking body 24.
The second planetary gear 1 is located in the rotation orbit of 4a.
9 meshes with the intermediate gear 20. As a result, the claw gear 21 and the support member 23 rotate, and the paper feed roller 1 rotates again in the paper feed direction (FIG. 15 (e)).

(F) Claw gear 21 and support 23
When the regulated portion 24b of the oscillating body 24 abuts on the branch end 17a of the planetary lever, the oscillating body 24 rotates clockwise, and the first claw 22 and the first claw 22 are rotated as shown in FIG. 12C. The engagement with the second claw 24a is released, and the rotations of the oscillating body 24 and the support body 23 are restricted, so that the paper feed roller 1 stops in the state of having just rotated once (FIG. 15).
(A)).

[0022]

In the above-described conventional paper feeding device, the leading end of the paper is brought into contact with the paper feed roller and the gate roller 4 which are reversed, and the skew is caused by the reaction force due to the slack of the paper generated at this time. Since the sheet is taken out, a lot of time is spent in removing the skew, and as a result, it is difficult to increase the speed of the sheet feeding operation.

Further, in the case of a paper having a weak stiffness, even if the slack is generated, the reaction force is small, so that the skew is not surely removed. On the contrary, in the case of a strong paper, the slack is sufficiently slack. There was a problem that it did not occur and the skew was not reliably removed. That is, in these cases, there is a problem that a reliable sheet feeding operation cannot be obtained.

An object of the present invention is to solve the above problems and to provide a sheet feeding device capable of quickly deskewing a sheet and performing a reliable sheet feeding operation. An object of the present invention is to provide a one-rotation clutch that can realize such a sheet feeding device.

[0025]

In order to achieve the above object, a one-rotation clutch according to a first aspect of the present invention is rotatably supported by a shaft and is rotated by power from the outside.
A claw gear having claws, a support fixed to the shaft, swingably supported on the support, and rotatable integrally with the support about the shaft. An oscillating body having a second pawl that engages and disengages with the first pawl of the gear with pawls, and a regulated portion whose movement is regulated by an external regulating means; and the oscillating body and the support body. And a biasing means for biasing the first claw and the second claw in a direction in which the first claw and the second claw engage with each other, and the movement of the regulated portion is regulated by the regulating means. A one-rotation clutch in which the oscillating body oscillates relative to the support body in a direction in which the second pawl is disengaged from the first pawl against the urging force of the urging means, The first claw can be separated from the second claw in a state where the second claw is located on the rotation path of the claw of It is characterized by having a space.

A sheet feeding device according to a second aspect is a sheet feeding device using the one-rotation clutch according to the first aspect, wherein the sheet feeding device is fixed to the shaft and partially contacts the sheet in the width direction of the sheet. The paper feed roller having a D-shape in side view for feeding the paper and allowing the rotation of the paper around the contact portion, and a gear that meshes with the gear with the pawls via an intermediate gear. A paper feed roller that rotates in a direction to feed the paper fed by the paper feed roller, a motor that drives the paper feed roller, and at least one on each side of the paper feed roller in the width direction of the paper. And a gate roller arranged to rotate while being pressed against the paper feed roller.

According to a third aspect of the present invention, there is provided the paper feeding device according to the second aspect, wherein the intermediate gear is in constant mesh with the gear with the claw and the gear of the paper feed roller.

A sheet feeding device according to a fourth aspect is a sheet feeding device using the one-rotation clutch according to the first aspect, which is fixed to the shaft and partially contacts the sheet in the width direction of the sheet. The paper feed roller having a D-shape in side view for feeding the paper and allowing the rotation of the paper around the contact portion, and a gear that meshes with the gear with the pawls via an intermediate gear. A paper feed roller that rotates in a direction to feed the paper fed by the paper feed roller, a motor that drives the paper feed roller, and at least one on each side of the paper feed roller in the width direction of the paper. A gate roller that is disposed and rotates while being pressed against the paper feed roller, and a carriage that is attached with a head for printing on the paper fed by the paper feed roller and that reciprocates in the width direction of the paper. The regulating means is operated by the movement of the carriage.

[0029]

The one-rotation clutch according to the first aspect operates as follows.

(I) The movement of the regulated portion of the oscillator is not regulated by the regulation means.

In this case, since the urging means urges the first pawl and the second pawl of the gear with pawls to engage with each other, the gear with pawls rotatably supported with respect to the shaft. When is rotated by power from the outside, the oscillating body rotates around the axis by the engagement of the first and second claws.

Since the oscillating body and the supporting body rotate integrally with each other about the shaft, the supporting body also rotates as the oscillating body rotates.

Since the support is fixed to the shaft,
The shaft also rotates with the support.

That is, when the movement of the regulated portion of the oscillating body is not regulated by the regulating means, the shaft is also rotated by the rotation of the gear with the claw.

(Ii) When the movement of the regulated portion of the oscillator is regulated by the regulating means.

In this case, the oscillating body oscillates relatively to the support body in the direction in which the second claw is disengaged from the first claw against the urging force of the urging means, and 2 nails first
Disengage from the nail.

Therefore, even if the gear with the claws is rotated by the power from the outside, the first and second claws are not engaged with each other, so that the rocking body is not rotated about the axis.

Since the oscillating body and the supporting body integrally rotate about the shaft, the oscillating body does not rotate.
The support also does not rotate.

Since the support is fixed to the shaft,
The shaft does not rotate as long as the support does not rotate.

That is, when the movement of the regulated portion of the oscillator is regulated by the regulating means, the shaft does not rotate even if the gear with the claw rotates.

As is apparent from the operations (i) and (ii), when the gear with the pawl is rotated by the power from the outside, the regulation of the oscillating body by the regulating means is once released, and the oscillating body After the rotation of the shaft, the shaft is rotated once by bringing the restriction means into a state in which the movement of the regulated portion of the oscillating body can be restricted again before the first rotation.

According to the one-rotation clutch of the present invention, the second pawl of the oscillator is located on the rotation path of the first pawl of the gear with pawl, that is, the first pawl. Since the space in which the first claw can be separated from the second claw is provided in a state in which the first claw and the second claw are engaged with each other or in a state in which they can be engaged with each other, within the range of this space, The claw gear can be rotated in the reverse direction while keeping the shaft stopped without rotating.

The sheet feeding device according to the second aspect operates as follows.

When the paper feed roller is rotationally driven by the motor, the gear of the paper feed roller meshes with the gear with the pawl via the intermediate gear, so that the gear with the pawl rotates in the same direction as the paper feed roller. .

Since a paper feed roller having a D-shape in a side view is fixed to the shaft, the restriction of the rocking member on the restricted portion by the restriction means is released, so that the one-rotation clutch (i) of the above (i) is removed. The paper feed roller is rotated by the operation, and the paper is fed by the contact of the circumferential portion with the paper.

When the leading edge of the fed sheet reaches the pressure contact portion between the sheet feed roller and the gate roller, the sheet is fed while being sandwiched by both rollers.

When the motor is rotated in the reverse direction immediately after the leading edge of the sheet passes through the pressure contact portion between the sheet feeding roller and the gate roller, the sheet feeding roller reverses and the leading edge of the sheet is pushed back. At this time, even if the claw gear rotates in the reverse direction, the shaft does not rotate due to the action of the one-rotation clutch according to claim 1, and
Therefore, the paper feed roller is in a stopped state. That is, the paper is pushed back toward the paper feed roller in the stopped state.

Here, at least one gate roller is arranged on each side of the paper feed roller in the width direction of the paper, and the paper feed roller partially contacts the paper in the width direction of the paper and makes this contact. Since the paper is allowed to rotate around the set, even if the leading edge of the paper passes through the pressure contact portion between the paper feed roller and the gate roller in a skewed state, the paper feed roller will cause the paper to roll when the paper is pushed back. At the same time as resistance is generated at the contact portion with the sheet, the paper is rotated around this contact portion, and the leading ends of the paper are aligned at the pressure contact portion between the paper feed roller and the gate roller. That is, the skew is removed.

After that, when the motor is rotated in the normal direction again, the sheet is fed with the skew removed.

Here, by setting the state in which the movement of the regulated portion of the oscillating body can be regulated again by the regulating means before the gear with claws makes one revolution, the shaft, that is, the paper feed roller, makes one revolution and stops. It will be.

According to such a sheet feeding device, even when the sheet is fed obliquely by reversing the sheet feeding roller immediately after the leading edge of the sheet has passed the pressure contact portion between the sheet feeding roller and the gate roller. By utilizing the difference in the amount of pull-in on the left and right in the paper width direction, the paper is instantaneously swiveled around the paper feed roller simultaneously with the reverse rotation of the paper feed roller, and the skew is removed by this, so that the skew is quickly removed in a short time. be able to.

Moreover, since the reaction force due to the looseness of the paper is not used, the skew can be surely removed regardless of the strength of the paper, and as a result, a reliable paper feeding operation can be performed. .

According to the paper feeding apparatus of the third aspect, in the paper feeding apparatus of the second aspect, the intermediate gear is always meshed with the gear with the claw and the gear of the paper feed roller. As a result, a more rapid paper feeding operation can be obtained.

For example, if it is selected whether or not the power is transmitted by the second planetary gear 19 as shown in FIG. 12 to the intermediate gear that transmits the power to the gear with the claws, the revolving motion of the planetary gear is calculated. Therefore, the paper feeding operation is delayed.

On the other hand, according to the sheet feeding device of the third aspect, since the intermediate gear is constantly meshed with the gear with the claw and the gear of the paper feed roller, a more rapid feeding operation can be obtained. In other words, by using the one-rotation clutch according to the first aspect, it is possible to reverse the paper feed roller while the paper feed roller is stopped.
Switching means such as planetary gears has become unnecessary.

The sheet feeding device according to the fourth aspect operates similarly to the sheet feeding device according to the second aspect.

According to the sheet feeding device of the fourth aspect, the following operation can be further obtained.

That is, since the regulating means is structured such that the head for printing on the paper fed by the paper feed roller is mounted and is operated by the operation of the carriage reciprocating in the width direction of the paper, By applying this paper feeding device to a printer equipped with a carriage of some kind, it is not necessary to separately provide a means for operating the regulating means, and the structure can be simplified, the number of parts can be reduced, and the cost can be reduced.

[0059]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view showing the internal structure of an example of a serial printer using an embodiment of the paper feeding device according to the present invention, FIG. 2 is an enlarged plan view of the same with parts omitted, and FIG. 3 is a paper feed roller and paper. It is an enlarged side view of the periphery of a feed roller.

First, an outline of this printer will be described with reference to FIG.

In FIG. 1, F is a sheet feeding device, which feeds the sheets P one by one. After being deskewed, the fed paper is wound around the paper feed roller 40 and inverted, and the feed angle is defined by the pinch roller 42, and the paper is delivered from the paper feed roller 40. The fed-out sheet is guided while being in contact with the upper surface of the regulation member 50, whereby the distance between the sheet and the inkjet head 60 is regulated,
Ink is ejected from the head 60 to print on the surface. The printed paper P is ejected onto the paper ejection tray 80 via the paper ejection roller pairs 71 and 72.

The ink jet head 60 is a head capable of performing color printing by ejecting a plurality of colors of ink, and is attached to the carriage 61. The carriage 61 is guided by the guide shaft 62 and the guide rail 63 and reciprocates in a direction orthogonal to the paper surface of FIG. 1 by driving a carriage motor (not shown). On the carriage 61, a monochrome ink tank and a color ink tank (not shown) are simultaneously mounted.

Next, the sheet feeding device F will be described.

As shown in FIGS. 1 and 2, the paper feeding device F is
The sheet feed tray 110, the sheet feed roller 120, and the one-rotation clutch 130 are provided.

The paper feed tray 110 is capable of holding a plurality of paper sheets P in a stack, and a paper feed hopper 111 is arranged in front of the paper feed tray 110. The paper hopper 111 is
As shown in FIG. 2, shafts 111a and 111b are swingably attached to the side plates 92 and 92 of the frame 90. A spring 112 is provided between the bottom plate 111c of the paper feed hopper 111 and the bottom plate 91 of the frame 90, whereby the paper feed hopper 111 biases the front of the paper P toward the paper feed roller 120. ing. Spring 112
2 is provided near the rear of the paper feed roller 120 in the paper transport direction, and thereby effectively biases the paper P toward the paper feed roller 120. . Note that 111d is a paper guide that guides the side edge of the paper, and its position is appropriately adjusted depending on the size of the paper.

As shown in FIG. 2, the paper feed roller 120 is composed of a relatively short roller, and guide rollers 121 are provided on both sides thereof.

As shown in FIG. 3, the paper feed roller 120 is D-shaped when viewed from the side, and at least its circumferential surface 120b is made of rubber having a relatively large friction coefficient. The guide roller 121 is made of a synthetic resin having a relatively small friction coefficient. The paper feed roller 120 is fixed to a shaft 122, and the guide roller 121 is rotatably supported by the shaft 122. The diameter of the guide roller 121 is equal to that of the paper feed roller 120.
Is slightly smaller than the diameter of the circumferential surface 120b of the sheet feeding roller 1
It is set so as to protrude from the flat surface portion 120a of 20.

As shown in FIG. 2, the shaft 122 is rotatably supported by the side plates 92 of the frame, and at the time of paper feeding, the motor M is driven to drive a gear train G and a one-rotation clutch 130 which will be described later. It is designed to rotate exactly once through. At this time, the paper feed roller 40 described later also rotates in the same direction as the paper feed roller 120. That is, as will be described later, when the paper feed roller 40 rotates normally, the paper feed roller 120 also rotates normally, and when the paper feed roller 40 rotates reversely, the power to the paper feed roller 120 is cut off.

In FIG. 3, 30 is a pad. The pad 30 is fixed to a holder 31, and the holder 3
1 is urged by the spring 32 toward the paper feed roller 120. Therefore, the pad 30 comes into contact with the guide roller 121 while facing the flat surface portion 120a of the paper feed roller 120 when the paper feed roller 120 is in the standby state, and comes into contact with the circumferential surface 120b of the paper feed roller 120 when the paper feed roller 120 rotates. . At this time, since the paper feed roller 120 is composed of a short roller, the circumferential portion 120b thereof partially contacts the paper in the width direction of the paper P, and when the skew is removed, which will be described later, this contact portion is contacted. It is designed to allow the rotation of paper around it.

Reference numeral 33 denotes a thin plate-shaped guide member fixed to the holder 31, and its tip portion 33a covers the end portion 30a of the pad 30.

As shown in FIG. 2, the paper feed roller 40 is
It is composed of one round bar-shaped rubber roller, and at least one gate roller 41 is arranged on each side of the paper feed roller 120 in the width direction of the paper P. In this embodiment, two gate rollers 41a and 41c are arranged on the left side of the sheet feeding roller 120, and one gate roller 4 is arranged on the right side.
1b is arranged, and another gate roller 41d is arranged slightly to the left.

As shown in FIG. 4, the one-rotation clutch 130 is a gear with a claw 1 rotatably supported on a shaft 122.
40, a support 150 fixed to the shaft 122,
An oscillating body 160 oscillatably supported by the supporting body 150 is provided.

The gear 140 with pawls has the first pawl 14 on its side surface.
1 (see FIG. 5). The gear portion with the claw 140 is always meshed with the intermediate gear 170 rotatably supported by the side plate 92 of the frame. Intermediate gear 1
Reference numeral 70 denotes a gear 4 fixed to a shaft 42 of the paper feed roller 40.
Always meshed with 3. A gear 44 is fixed to the end of the paper feed roller shaft 42, and the gear 44 meshes with a pinion 46 (see FIG. 2) of the motor M via a reduction gear 45.

Therefore, the gear 140 with the claws is driven by the motor M so that the pinion 46, the reduction gear 45, the gear 44,
The paper feed roller 40 is rotationally driven at the same time and in the same direction via the gear 43 and the intermediate gear 170. The gear 43 is fixed to the paper feed roller shaft 42 via a buffer spring 43a.

The support 150 has a hole 151 that fits into the shaft 122, and the convex portion 1 formed in this hole 151.
Since 52 (see FIG. 6) is engaged with the concave groove 122a of the shaft 122, it is fixed to the shaft 122 so as not to rotate.

The oscillating body 160 has a shaft 161,
Since the shaft 161 is rotatably fitted in the bearing hole 153 of the support 150, it is swingably attached to the support 150. Since the rocking body 160 and the support body 150 are connected by the shaft 161, the shaft 122
Rotates as a unit. The oscillating body 160 is
As shown in FIG. 7, it is formed in a substantially ring shape having a swing restriction hole 162 in the central portion.
Is swingable with respect to the support body 150 within a range in which the inner edge portion thereof contacts the outer circumference 151a of the cylindrical portion of the support body 150.

In FIG. 7, 163 is a gear 140 with a claw.
The second claws 164 that engage with and disengage from the first claws 141 are pin-shaped restricted portions (hereinafter, referred to as pins) whose movement is restricted by a lever 180 described later.

A tension spring 154 (see FIGS. 4 and 9) is provided between the oscillating body 160 and the support 150, and the direction in which the first claw 141 and the second claw 163 are engaged with each other. The oscillating body 160 is biased. In FIG. 6B, 155 is a hook portion to which one end of the tension spring 154 is locked, and in FIGS. 7A and 7C, 165 is a hook portion to which the other end is locked.

180 in FIGS. 4, 8 and 9.
Is a lever for actuating the one-rotation clutch 130, and is a projecting piece 65 provided on the carriage 61.
Operated by. The protrusion 65 is provided on the back side of the paper surface in FIG.

As shown in FIG. 8, the lever 180 has a shaft hole 181 and a hook portion 182.
A shaft 93 (see FIG. 4) fixed to the side plate 92 of the frame is inserted therethrough so as to be rotatably attached to the side plate 92 of the frame. A tension spring 185 is provided between the hooking portion 184 provided above the shaft hole 181 and the hooking portion 94 of the side plate 92 (see FIG. 4), whereby the lever 180 moves the timepiece in FIG. Biased in the direction. When the lever 180 is rotated in the clockwise direction, the hook portion 182 causes the swing member 16 to move.
The pin 164 of No. 0 is located in the rotation path of the pin 164 and regulates the rotation.

The operation of the one-rotation clutch and the sheet feeding device as described above is as follows.

(I) In the standby state, the motor M is stopped. The hook portion 182 of the lever 180 is shown in FIG.
As shown in FIG. 10A, the pin 164 of the oscillating body 160 is abutted to restrict the rotation of the oscillating body 160 and the supporting body 150, and as shown in FIG.
It is stopped in such a posture that it does not come into contact with the paper P.

(Ii) When the paper feed command signal is output from the sequence circuit of the printer, the carriage 61 is driven by the carriage motor (not shown) to move the carriage 61 to the leftmost end in FIGS. 2 and 4. Then, as shown in FIG. 9B, the protrusion 65 of the carriage 61 presses the upper end of the lever 180 to rotate the lever 180 counterclockwise. As a result, the restriction on the pin 164 by the hook 182 is released, and the swinging body 160 swings around the shaft 161 by the action of the spring 154. As a result, the second claw 163 is positioned in the rotation path of the first claw 141 and is in a state in which it can be engaged therewith.

When the paper feed command signal is output,
The motor M rotates in the normal direction, the paper feed roller 40 rotates in the normal direction, and at the same time, the gear 43 and the intermediate gear 170 of the paper feed roller 40.
The gear 140 with pawls also rotates in the forward direction. This allows
When the first claw 141 and the second claw 163 are engaged with each other, the oscillating body 160 and the support body 150 rotate, and the paper feeding roller 1
20 rotates, and the paper P is fed toward the paper feed roller 40.

That is, as shown in FIG. 10B, the paper P is fed toward the paper feed roller 40 which is normally rotating (see FIG. 11A).

(Iii) When the leading edge P1 of the fed sheet P reaches the pressure contact portion between the sheet feed roller 40 and the gate roller 41, the fed sheet P is fed while being sandwiched by both rollers.

(Iv) The carriage leaving signal is output by the sequence circuit, and the carriage 61 is moved to the right in FIGS. 2 and 4 by the drive of the carriage motor (not shown). As a result, as shown in FIG. 9C, the protrusion 65 of the carriage 61 is disengaged from the upper end of the lever 180, the lever 180 is rotated clockwise, and the hook 182 is rotated by the pin 164 of the rocking body 160. Located in orbit.

(V) At the time when the motor M rotates forward by a predetermined number of revolutions, the sequence circuit outputs a reverse rotation command signal, and the motor M rotates in reverse. The timing at which this reverse rotation command signal is issued is based on the paper feed command signal, or
Based on the detection signal from the detector 47 (see FIG. 1) that detects the passage of the leading edge of the sheet, the sheet is emitted immediately after the leading edge of the sheet passes the pressure contact portion between the sheet feed roller 40 and the gate roller 41. It is set. The state immediately before the reverse rotation of the motor M is shown in FIGS. 9 (c), 10 (c), and 11 (b).

When the motor M rotates in the reverse direction, the paper feed roller 40
Is reversed and the leading edge of the paper is pushed back. This reverse operation is sufficient to ensure that the leading edge P1 of the paper P passes through the pressure contact portion between the paper feed roller 40 and the gate roller 41, but the pressure contact portion between the paper feed roller 40 and the gate roller 41 is Since the conveying force for the paper is cut off when the paper passes, the leading edge P1 of the paper returns only to the position just past the pressure contact portion between the paper feed roller 40 and the gate roller 41. At this time, the gear 140 with pawls is also rotated in the reverse direction, but the shaft 122 does not rotate due to the following action of the one-rotation clutch 130, and thus the paper feed roller 120 is in a stopped state.

That is, the one-rotation clutch 13 of this embodiment.
At 0, as is clear from FIGS. 9C and 9D, the oscillating body 16 is placed on the rotation path of the first pawl 141 of the gear 140 with pawls.
In the state where the second claw 163 of 0 is positioned, that is, the state where the first claw 141 and the second claw 163 are engaged or can be engaged, the first claw 141 moves to the second claw 141. Nail 163
A space S that can be separated from is provided. Therefore,
Within the range of the space S, as shown in FIG. 9D, the claw gear 140 can be rotated in the reverse direction while the shaft 122 is stopped without being rotated.

In this way, the paper P is pushed back toward the paper feed roller 120 in the stopped state.

At least one gate roller 41 is arranged on each side of the paper feed roller 120 in the width direction of the paper P, and the paper feed roller 120 partially overlaps the paper in the width direction of the paper P. Since the sheets are brought into contact with each other and rotation of the sheet around the contact portion is permitted, the leading edge P1 of the sheet P is temporarily skewed as shown in FIGS. 11 (a) and 11 (b).
Even when the paper passes through the pressure contact portion between the paper feed roller 40 and the gate roller 41, when the paper is pushed back, as shown in FIG.
As shown in (c), the paper feed roller 120 becomes a resistance at the contact portion 123 with the paper P, and the paper rotates around the contact portion 123 (in the direction of arrow a), so that the paper feed roller 40 and the gate roller 41. The leading ends P1 of the sheets are aligned at the pressure contact portion of. That is, for example, as shown in FIG. 11B, when the sheet skews with the right side of the sheet P leading, when the sheet feed roller 40 rotates in the reverse direction, the gate roller 41
When the leading edge P1 of the sheet passes through a, the gate roller 41
While the push-back force of the sheet a by the sheet a disappears, the push-back force of the sheet by the gate roller 41b still exists, so that the sheet rotates as described above and the skew is removed. The same action can be obtained when the paper is wide and is caught by the gate roller 41c.

(Vi) When the motor M is rotated by a predetermined number of revolutions, that is, when the leading end P1 of the paper P is rotated sufficiently enough to reliably pass through the pressure contact portion between the paper feed roller 40 and the gate roller 41, the sequence circuit is operated. The normal rotation command signal is output, and the motor M rotates in the normal direction again.

As a result, the sheet P is fed in the state where the skew has already been removed (FIG. 10).
(D), FIG. 11 (d)).

(Vii) Since the hook portion 182 of the lever 180 is already positioned in the rotation path of the pin 164 of the rocking body 160 by the operation of the above (iv), the rocking body 160 is rotated by the forward rotation of the motor M. The pin 164 of the hook portion 182
The shaft 122, that is, the feed roller 120,
It will rotate and stop (see FIG. 9A). At this time, the oscillating body 160 oscillates counterclockwise in FIG. 9 to release the engagement between the first claw 141 and the second claw 163, and thereafter, the claw gear 140, that is, the paper feed roller 40, moves. The motor M is in a state in which it can be freely rotationally driven.

According to the paper feeding device F as described above, the paper P
By rotating the paper feed roller 40 in the reverse direction immediately after the front end P1 of the paper P passes through the pressure contact portion between the paper feed roller 40 and the gate roller 41, even when the paper P is obliquely fed, the difference in the pulling amount in the left and right directions in the paper width direction is reduced. By utilizing the reverse rotation of the paper feed roller 40, the paper P is instantaneously swiveled around the paper feed roller 120, and the skew is removed by this, so that the skew can be quickly removed in a short time.

Moreover, since the reaction force due to the looseness of the paper is not used, the skew can be surely removed regardless of the strength of the paper, and as a result, a reliable paper feeding operation can be performed. .

Further, the intermediate gear is 170, and the gear 14 with a claw is provided.
0 and the gear 43 of the paper feed roller 40 are in constant mesh with each other, so that a more rapid paper feeding operation can be obtained. For example, if it is selected whether or not the power is transmitted to the intermediate gear 170 that transmits the power to the claw gear 140 by the second planetary gear 19 as shown in FIG. 12, only the revolving motion of the planetary gears is selected. The paper feeding operation will be delayed. On the other hand, according to the sheet feeding device F, the intermediate gear 170 includes the claw gear 140 and the paper feed roller 40.
Since the gear 43 is always meshed with the gear 43, a more rapid paper feeding operation can be obtained. Conversely, one-turn clutch 1
By using 30, it is possible to rotate the paper feed roller 40 in the reverse direction with the paper feed roller 120 stopped, so that a switching means such as a planetary gear is unnecessary.

Further, since the lever 180 for actuating the one-turn clutch 130 is actuated by the operation of the carriage 61, it is not necessary to separately provide means for actuating the lever 180, which simplifies the structure and reduces the number of parts. Reduction and cost reduction can be achieved.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be appropriately made within the scope of the gist of the present invention.

[0102]

According to the one-rotation clutch of the present invention, when the second pawl of the oscillating body is positioned on the rotation path of the first pawl of the gear with pawl attached to the shaft, the shaft is mounted on the shaft. The claw gear can be rotated in the reverse direction while being stopped without rotating.

According to the paper feeding apparatus of the present invention, the skew of the paper can be quickly removed and the paper feeding operation can be surely performed.

[0104]

[Brief description of drawings]

FIG. 1 is a side view showing an internal structure of an example of a serial printer using an embodiment of a sheet feeding device according to the present invention.

FIG. 2 is a partially omitted enlarged plan view of the same.

FIG. 3 is an enlarged side view around a paper feed roller and a paper feed roller.

FIG. 4 is an enlarged plan sectional view mainly showing a one-rotation clutch.

FIG. 5 is a right side view of the gear with pawls.

6A and 6B are views showing a support, in which FIG. 6A is a front view, FIG. 6B is a left side view, FIG. 6C is a right side view, and FIG. 6D is a sectional view taken along line d-d in FIG.

7A and 7B are views showing an oscillating body, where FIG. 7A is a front view, FIG. 7B is a left side view, FIG. 7C is a right side view, and FIG. 7D is a sectional view taken along line d-d in FIG.

FIG. 8 is a view showing a lever, (a) is a plan view, (b) is a front view, and (c) is a left side view.

9 (a), (b), (c), and (d) are operation explanatory views, respectively.

10 (a), (b), (c), and (d) are operation explanatory views, respectively.

11 (a), (b), (c), and (d) are operation explanatory views, respectively.

12 (a), (b), (c), and (d) are explanatory views of a conventional technique.

FIG. 13 is an explanatory diagram of a conventional technique.

FIG. 14 is an explanatory diagram of a conventional technique.

15 (a), (b), (c), (d), and (e) are explanatory views of a conventional technique.

[Explanation of symbols]

 P paper F paper feeder S space M motor 40 paper feed roller 41 gate roller 43 paper feed roller gear 60 head 61 carriage 65 projecting piece 120 paper feed roller 122 shaft 130 1 rotation clutch 140 claw gear 141 first claw 150 Support 154 Extension spring 160 Oscillator 163 Second claw 164 Pin 170 Intermediate gear 180 Lever 182 Hook part

[Procedure amendment]

[Submission date] November 7, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 7

[Correction method] Change

[Correction content]

7A and 7B are views showing an oscillating body, where FIG. 7A is a front view, FIG. 7B is a left side view, FIG. 7C is a right side view, and FIG. 7D is a sectional view taken along line d-d in FIG. 3E is a cross-sectional view taken along the line ee in FIG.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Fig. 12

[Correction method] Change

[Correction content]

12 (a), (b) and (c) are explanatory views of a conventional technique.

Claims (4)

[Claims] 1. A gear with a pawl that is rotatably supported on a shaft and is rotated by power from the outside and has a first pawl on a side surface, a support body fixed to the shaft, and this support body. A second pawl that is swingably supported with respect to the first pawl and that rotates integrally with the support about the shaft and that is engaged with and disengaged from the first pawl of the gear with pawls;
An oscillating body having a regulated portion whose movement is regulated by an external regulating means, and provided between the oscillating body and the supporting body, the first claw and the second claw engage with each other. Urging means for urging in the direction,
When the movement of the regulated portion is regulated by the regulating means, the supporting member is supported in a direction in which the second claw is disengaged from the first claw against the urging force of the oscillating body. In a one-rotation clutch that swings relative to the body, the first pawl can be separated from the second pawl in a state where the second pawl is located on the rotation path of the first pawl. A one-rotation clutch characterized by having a space. 2. The sheet feeding device using the one-rotation clutch according to claim 1, wherein the sheet is fed while being fixed to the shaft and partially contacting the sheet in the width direction of the sheet. The paper feed roller has a D-shape in side view that allows the rotation of the paper around the contact portion, and a gear that meshes with the gear with the pawl via an intermediate gear, and rotates in the same direction as the gear with the pawl to feed the paper. A paper feed roller that feeds the paper fed by the roller, a motor that drives the paper feed roller, and at least one each on both sides of the paper feed roller in the width direction of the paper. A sheet feeding device comprising: a gate roller that is pressed and rotated. 3. The paper feeding device according to claim 2, wherein the intermediate gear is in constant mesh with the gear with the claw and the gear of the paper feed roller. 4. A sheet feeding device using the one-rotation clutch according to claim 1, wherein the sheet is fed while being fixed to the shaft and partially contacting the sheet in the width direction of the sheet. The paper feed roller has a D-shape in side view that allows rotation of the paper around the contact portion, and a gear that meshes with the gear with the pawl via an intermediate gear, and rotates in the same direction as the gear with the pawl to feed the paper. A paper feed roller that feeds the paper fed by the roller, a motor that drives the paper feed roller, and at least one paper feed roller on each side of the paper feed roller in the width direction of the paper. A gate roller that is pressed and rotated to rotate; and a carriage that is attached with a head for printing on the paper fed by the paper feed roller and that reciprocates in the width direction of the paper. A sheet feeding device which is operated by the operation of a carriage.