JPH05294531A - Sheet reversing and carrying device - Google Patents

Abstract

PURPOSE:To simplify the structure and the control by driving a uni-direction feeding roller of a discharge passage through a gear train by the power of a motor to drive a normal/reverse feeding roller in a device where the paper sheet carried to the reversing passage is reverse-fed by the normal/reverse feeding roller and fed to the discharge passage. CONSTITUTION:In a device where the paper sheet fed from an advancing passage 1 to a reversing passage 3 through a switching member 7 is fed to a discharge passage 2 through the switching member 7 by the reverse movement of a normal/reverse feeding roller 6, and delivered by a uni-directional feeding roller 5 provided on the discharge passage 2, the normal/reverse feeding roller 6 (normal/reverse feeding roller gear 13) is rotated through a gear train 14 by the action of a normal/reverse rotating motor 12. The rotation of this motor 12 is transmitted to the uni-directional clutch gears 15, 16 which are rotated in the reverse direction to each other through the gear trains 17, 18. Then, the rotation of a common pivot shaft 19 of these clutch gears 15, 16 is transmitted to a uni-directional feeding roller 5 (a uni-directional feeding roller gear 21) through a gear 20 and a gear train 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet reversing / conveying device in a printer or the like, and more specifically, it feeds a sheet from an entrance path to a reversing path and reverses the fed sheet by a forward / reverse feeding roller of the reversing path. The present invention relates to a sheet reversing / conveying device that feeds a sheet to a discharge path and picks up and conveys it by a one-way feed roller of the discharge path.

[0002]

2. Description of the Related Art In a conventional sheet reversing / conveying apparatus, a forward / reverse feed roller in a reversing path is driven by a forward / reverse rotation motor, and a one-way feed roller for a discharge path or a one-way feed roller for an entrance path is driven by a one-way rotation motor. Using two motors driven by, or using one motor, make the gear train an odd-numbered train for the rotation transmission gear train to the forward / reverse feed roller or the one-way feed roller of the discharge path or the entrance path. It is provided with a switching planetary gear and a switching connecting / disconnecting clutch for switching between the even number of rows and the even number of rows.
The one using one motor has a problem that the switching control of the planetary gear and the connecting / disconnecting clutch becomes more complicated.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and one forward / reverse rotation motor rotates a forward / reverse feed roller and a one-way feed roller to switch between them. An object of the present invention is to provide a sheet reversing / conveying device that does not require a planetary gear or a switching connection / disconnection clutch.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a sheet is fed from an entrance path to a reversal path, and the fed sheet is reversely moved by a forward / reverse feed roller of the reversal path to be discharged to a discharge path to be discharged in one direction of the discharge path. In a sheet reversing / conveying device for picking up and conveying by a feed roller, between a two gears rotated in parallel in opposite directions by a gear train from a forward / reverse rotation motor driving the forward / reverse feed roller and a shaft of the gear. There is provided a one-way clutch in the same direction, which is connected so as to transmit the rotation of the shaft to the one-way feed roller.

[0005]

That is, in the sheet reversing / conveying apparatus of the present invention, the forward / reverse rotation motor for driving the forward / reverse feed rollers in the reversing path and at least the one-way feed roller in the discharge path are driven in opposite directions by the gear train from the motor. A two-way clutch that is rotated in parallel with the shaft of the gear is provided with a one-way clutch in the same direction, and the rotation of the shaft is connected to the one-way feed roller, so that Regardless of whether the rotary motor rotates in the forward or reverse direction, the one-way feed roller rotates in only one direction, eliminating the need for planetary gears and disconnecting clutches that require switching control, making the device compact and compact. Cost can be reduced.

[0006]

The present invention will be described below with reference to the illustrated examples.

FIG. 1 and FIG. 2 are side views of the conveyance path in the non-reversal conveyance state and the reversal conveyance state showing examples of the sheet reversal conveyance apparatus of the present invention, and FIGS. 3 and 4 show the feed rollers of the reversal path and the discharge path, respectively. It is a schematic perspective view showing an example of a drive mechanism.

1 and 2, 1 is a sheet entrance path, 2 is a discharge path, 3 is a reverse path, and 4 and 5 are unidirectional feed rollers 1 and a discharge path 2 which rotate in the direction of the arrow. Is a forward / reverse feed roller that rotates in the direction of the solid line arrow when the sheet is received in the reversing path 3, and rotates in the direction of the dotted line arrow when reversing the sheet from the reversing path 3 and 7 is an electromagnet or the like provided on the rotation center shaft 7a. As shown in FIG. 1, a straight path 8 connecting the approach path 1 and the discharge path 2 is opened and a curved path 9 connects the approach path 1 and the reversing path 3 by an automatic switching means by means of or a manual switching means by an operating lever or the like. 2 and the position where the approach road 1 side is closed, and as shown in FIG.
A switching member that is rotated and switched to a position that closes the approach path 1 side of 10; and 10 is a reverse path that connects the reverse path 3 and the discharge path 2,
The reverse path 10 is also formed on the outer side by the switching member 7 so as to form a delta shape with the straight path 8 and the curved path 9.

The switching member 7 closes the reverse path 3 side of the curved path 9 and guides a sheet which is reversely moved from the reverse path 3 by a forward / reverse feed roller 6 rotating in the direction of a dotted line to a reverse path 10 to prevent reverse return. A member 11 is provided so as to be swingable around a swing center axis 11a. The reversion preventing member 11 occupies the above-described position by the torque due to its own weight or the torque due to the spring bias, and the switching member 7 is switched to the position where the curved path 9 is opened as shown in FIG. When advancing along the curved path 9 by the feed roller 4, the sheet is oscillated and displaced to a position where it is pushed by the sheet and the curved path 9 shown by the two-dot chain line in FIG.

The sheet conveying path of the sheet reversing sheet conveying apparatus of the present invention is not limited to the above-mentioned example, and there is no sheet passage for directly advancing the sheet from the entrance passage 1 to the discharge passage 2, that is, the switching member 7 is in the state as shown in FIG. It may be a fixed member or a fixed wall. Needless to say, the one-way feed rollers 4 and 5 and the forward / reverse feed roller 6 may be a pair of rollers that are in pressure contact with each other only when the sheet is fed, or may be a pair of rollers that are in constant pressure contact with each other.

In FIGS. 3 and 4, 12 is a forward / reverse rotation motor, 13 is a forward / reverse feed roller gear that is rotated from the forward / reverse rotation motor 12 by a gear train 14, and 15 and 16 are forward / reverse rotation motors 12, respectively. One-way clutch gears that are rotated in parallel in opposite directions by gear trains 17 and 18, from FIG. 3 at 19 is a common pivot for one-way clutch gears 15 and 16, and 20 is a common pivot gear that rotates integrally with common pivot 19. And 191 and 192 in FIG. 4 are one-way clutch gears, respectively.
15 and 16 pivots, 201 and 202 are pivot gears which rotate integrally with pivots 191 and 192, respectively.

Common pivot with one-way clutch gears 15 and 16
19 or the respective pivots 191 and 192 are engaged via a one-way clutch in the same direction. That is, in the illustrated example, when the one-way clutch gears 15 and 16 rotate in the directions of the solid arrows by the rotation of the forward / reverse rotation motor 12 in the directions of the solid arrows, the rotation of the one-way clutch gears 16 in the direction of the solid arrows indicates the common pivot shaft 19 or Axis 192 and therefore common Axis gear 20
The rotation of the one-way clutch gear 15 in the direction of the solid line arrow is idled and is not transmitted to the common pivot shaft 19 or the pivot shaft 191 and thus to the common pivot gear 20 or the pivot gear 201. When the one-way clutch gears 15 and 16 rotate in the dotted arrow directions by the rotation of the forward / reverse rotation motor 12 in the dotted arrow directions, the rotation of the one-way clutch gear 15 in the dotted arrow direction is the common pivot shaft 19 or the pivot shaft 191. When transmitted to the common pivot gear 20 and the pivot gear 201, the rotation of the one-way clutch gear 16 in the direction of the dotted arrow rotates idly and the common pivot 19 and the pivot shaft are rotated.
192 Therefore, it is not transmitted to the common pivot gear 20 or the pivot gear 202.

Reference numeral 21 is a one-way feed roller gear that is rotated by the gear train 22 from the common pivot gear 20 or the pivot gears 201 and 202, and the forward / reverse rotation motor 12 is rotated in either direction by the rotation transmission mechanism described above. Even so, it can be rotated in one direction as shown by the arrow in the figure.

Common pivot gear 20 or pivot gears 201 and 2
By providing a gear train branching in parallel from the middle of the gear train from 02 to the one-way feed roller gear 21, the rotation can be transmitted to the one-way feed roller 4 of the approach path 1.

In this case, as a modification of the example of FIG. 4, one of the pivot gears 201 and 202 may be the drive source gear of the one-way feed roller 4, and the other may be the drive source gear of the one-way feed roller 5. As a result, the forward / reverse rotation of the forward / reverse rotation motor 12 switches the rotation of the one-way feed rollers 4 and 5 from each other, and the speed of the one-way clutch at the time of slippage is reduced and wear is reduced. However, on the other hand, when the sheet comes off the forward / reverse feed roller 6, it is impossible to immediately switch the rotation direction of the forward / reverse rotation motor 12 to receive the sheet in the reversing path 3. In that respect, when the rotation is transmitted from the common pivot gear 20 and the pivot gears 201 and 202 to the one-way feed rollers 4 and 5 of the approach path 1 and the discharge path 2, as soon as the sheet deviates from the forward and reverse feed rollers, Forward / reverse rotation motor
The sheet can be received in the reversing path 3 by reversing 12.

The rotation speed ratio of the forward / reverse feed roller gear 13 and the unidirectional feed roller gear 21 when the forward / reverse rotation motor 12 rotates in the solid arrow direction and the dotted arrow direction should be the same depending on the gear ratio of the rotation transmission series. You can change it. Therefore,
In the illustrated example in which the rotation of the forward / reverse rotation motor 12 in the direction of the solid line arrow is the rotation in which the sheet is sent from the reverse passage 3 to the discharge passage 2, the rotation of the forward / reverse feed roller gear 13 and the one-way feed roller gear 21 in the rotation direction. The number ratio is set to a value such that the feed speed of the unidirectional feed roller 5 is faster than the feed speed of the forward / reverse feed roller 6 so that the sheet is not loosened between the forward / reverse feed roller 6 and the unidirectional feed roller 5. preferable. In that case, the gripping and conveying force of the unidirectional feed roller 5 is made stronger than the gripping and conveying force of the forward / reverse feed roller 6 so that an excessive tension is not applied to the sheet, and the sheet is unidirectionally fed by the roller 5. After being gripped by the sheet, the sheet can be conveyed at the conveying speed.

When the unidirectional feed roller 4 of the approach path 1 is also rotated by the forward / reverse rotation motor 12, the forward / reverse feed roller 6 and the unidirectional feed roller 4 are conveyed in the rotation of the motor 12 in the direction of the dotted arrow. It is preferable to set the speed ratio to 1 or more so as not to loosen the sheet, and to make the gripping and conveying force of the forward / reverse feed roller 6 stronger than the gripping and conveying force of the unidirectional feed roller 4.

[0018]

According to the sheet reversing / conveying device of the present invention, the forward / reverse feed roller of the reversing path and the unidirectional feed roller of the discharging path are rotated by one forward / reverse rotation motor to operate the switching planetary gear and the switching connecting / disconnecting clutch. Since it is not necessary, the structure and the control are simple, and the remarkable effect that the size and the cost can be reduced can be obtained.

[Brief description of drawings]

FIG. 1 is a side view of a conveyance path in a non-reversed conveyance state showing an example of a sheet reversal conveyance device of the present invention.

FIG. 2 is a side view of a conveyance path in a reverse conveyance state.

FIG. 3 is a schematic perspective view showing an example of a drive mechanism of a feed roller in a reverse path and a discharge path.

FIG. 4 is a schematic perspective view showing another example of the drive mechanism of the feed roller in the reverse path and the discharge path.

[Explanation of symbols]

 1 Entry path 2 Discharge path 3 Inversion path 4, 5 Unidirectional feed roller 6 Forward / reverse feed roller 7 Switching member 11 Reverse return blocking member 12 Forward / reverse rotation motor 13 Forward / reverse feed roller Gears 14, 17, 18, 22 Gear train 15, 16 One-way clutch gear 19 Common axis 191,192 Axis 20 Common axis gear 201,202 Axis gear 21 One-way feed roller gear

Claims (2)

[Claims] 1. A sheet is fed from an approach road to a reversing road,
In a sheet reversing / conveying device in which the fed sheet is moved backward by the forward / reverse feed rollers in the reversing path, is fed to the discharge path, and is picked up and conveyed by the one-way feed roller in the discharging path A one-way clutch of the same direction is provided between two gears that are rotated in parallel in opposite directions from a motor by a gear train and a shaft of the gears,
A sheet reversing / conveying device, wherein the rotation of the shaft is connected to the one-way feed roller so as to be transmitted thereto. 2. The sheet reversing / conveying apparatus according to claim 1, wherein the gear trains including the two gears have different gear ratio absolute values.