JPH0811366A - Form-conveying device - Google Patents

Abstract

PURPOSE:To enable a form to be pulled out in the desired direction by releasing a detent mechanism in the case of jam treatment in a form-conveying device in which the feeding pitch of the form through a rotor is decided by the detent mechanism. CONSTITUTION:A form-conveying device is provided with a detent gear 15 synchronously rotated with a rotor 4 for conveying a form 5, a freely displaced detent arm 16 which is energized in one direction and engaged with the detent gear 15 and an electromagnetic coil 38 attracting the detent arm 16. When a jam is occured, the electromagnetic coil 38 is magnetized by a detection signal sent from a detection means 25 for detecting occurrence of the jam or jam-treating operation. Thereby the detent arm 16 is separated from the detent gear 15 and the rotor 4 is regulated to a free state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying device used in a printing machine.

[0002]

2. Description of the Related Art In order to accurately maintain the printing position on a sheet, it is necessary to accurately determine the sheet feed amount. In particular, in the case of color printing in which images of a plurality of colors are superimposed and printed on paper, the paper feed pitch must be more accurately determined. For this reason, the detent arm is engaged with the detent gear that rotates integrally with the paper feed roller, the detent arm is separated from the detent gear when the paper is conveyed, and the detent gear is engaged with the detent gear when the paper feed roller is stopped. By doing so, there is a sheet conveying device in which the stop position of the sheet feeding roller is fixed.

An example thereof will be described below with reference to FIG. A paper feed passage 1, a reversing passage 2 and a paper feed passage 3 are provided so as to be sequentially connected. A paper feed roller 4 also serving as a paper feed roller is rotatably provided inside the reversing passage 2.
Below the paper feed roller 4, a paper retainer 6 for pressing the paper 5 inserted from the paper feed path 1 to the paper transport roller 4 is provided. Paper guide plate 7 along the paper transport path 3
A leaf plate 8 for pressing the paper 5 against the paper guide plate 7 and an ink cartridge 9 are arranged opposite to each other.
The ink cartridge 9 includes an ink tank 10 mounted on a carrier (not shown) that is reciprocally driven along the axial direction of the paper feed roller 4, and an inkjet head 11 connected to the ink tank 10. Also,
A paper discharge tray 12a is integrally formed on the paper guide plate 7. Further, a paper discharge roller (rubber roller) 13 is rotatably provided on the side plates 12 formed on both sides of the paper guide plate 7, and a large number of teeth contacting the outer periphery of the paper discharge roller 13 with a minute contact surface seat. The paper retainer 14 that it has is rotatably provided. Then, the paper feed roller 4
A detent gear 15 is fixed to one end of the detent gear 15, and a detent arm 16 that is biased in one direction (upward) and meshed with the teeth of the detent gear 15 is rotatably provided around a support shaft 17.

In the structure shown in FIG. 5, when the paper feed roller 4 and the paper discharge roller 13 are driven in the clockwise direction by a motor (not shown), the detent gear 15 also rotates in the clockwise direction and the teeth of the detent gear 15 The component force generated by the contact with the tip of the detent arm 16 causes the detent arm 16 to separate from the detent gear 15 and allows the paper feed roller 4 to rotate in the clockwise direction. As a result, the paper 5 is fed to the front surface of the inkjet head 11 by the paper feed roller 4, and the inkjet head 11
Is printed by and is conveyed upward by the paper feed roller 4 and the paper discharge roller 13. At this time, since the ink does not immediately dry immediately after printing, the paper 5 is pressed onto the paper discharge roller 13 by the paper presser 14 having teeth with a small contact area with the paper 5.

[0005]

By the way, in jam processing, the motor is stopped and the jammed paper 5 is pulled out. At this time, the paper feed roller 4 and the paper discharge roller 13 are rotated by the pulling force of the paper 5. . In such a case, the detent gear 15 meshes with the detent arm 16 that allows the paper feed roller 4 to rotate in the clockwise direction by separating the detent arm 16 when the paper is fed, and returns when the motor is stopped. Paper feed roller 4
Because it is a structure that prohibits the rotational movement of the
Even when the leading edge of the jammed paper 5 is not visible from the downstream side of the paper feed roller 4 (the paper discharge roller 13 side) and it is easier to pull out the paper 5 to the paper feed path 1 side, the paper 5 is discharged to the paper discharge roller 13 It must be pulled out to the side, making it difficult to clear the jam.

When the paper 5 is forcibly pulled toward the paper feed path 1, a large frictional force between the paper feed roller 4 and the paper 5 acts on a part of the paper feed roller 4, so that the paper feed roller 4 is unevenly worn and the paper feed roller 4 is also worn. Paper dust sticks to No. 4, which affects the paper feeding action. As a result, the life of the paper feed roller 4 is shortened.

[0007]

DISCLOSURE OF THE INVENTION According to the present invention, a rotating body that conveys a sheet, a detent gear that rotates in synchronization with the rotating body, and a displaceable detent that is biased in one direction and meshes with the detent gear. An arm, an electromagnetic coil having an attractive force that separates the detent arm from the detent gear, a detection unit that detects a jam occurrence or a jam processing operation, and an excitation voltage for the electromagnetic coil by a detection signal from the detection unit. It is a sheet conveying device configured with a driving unit that outputs the.

[0008]

According to the present invention, when a jam occurs, the drive means excites the electromagnetic coil based on the detection signal generated by the detecting means for detecting the occurrence of the jam or the detecting means for detecting the jam processing operation. , The detent arm is separated from the detent gear, and thereby the rotating body for conveying the sheet is in a free state.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. The same parts as those described in FIG. 5 are denoted by the same reference numerals, and description thereof is omitted. 1 and 2,
A cover 19 is openably and closably attached to the top of the housing 18. Both sides of the paper guide plate 7 are attached to both sides of a holder 20, and the paper holder 14 and a cleaning roller 21 for wiping ink adhering to the teeth of the paper holder 14 are rotatably held in the holder 20. . Also,
On the side plate 12 of the paper guide plate 7, an eject arm 22 for sending the rear edge of the paper 5 conveyed by the paper discharge roller 13 toward the paper discharge tray 12a is rotatably provided.

The paper guide plate 7 is detachably held by the housing 18. That is, the upper and both sides of the paper guide plate 7 are held by the levers 23. These levers 23 are rotatably attached to both sides of the housing 18 via a support shaft 24, and one of the levers is integrally formed with a projecting piece 25a, and the lever 23 is interfered with by the projecting piece 25a.
A switch 25, which is a detection unit that detects the rotating operation (jamming operation) of the, is provided inside the housing 18. Further, as shown in FIG. 3, a protrusion 26 having a tapered lower end is integrally formed at the lower portion of the side plate 12 of the paper guide plate 7, and although only one side is shown, the frame 2 provided inside the housing 18 is shown.
A guide groove 28 for slidably guiding the protrusion 26 is formed in the guide 7. The paper guide plate 7 is formed with a plurality of grooves 29 for exposing the outer peripheral portion of the paper feed roller 4.

Next, as shown in FIG. 4, the CPU 30
And RO where fixed data such as programs are written
M31 and RAM3 in which variable data is temporarily written
2 are connected by a bus line. Also, CPU
A sheet feeding roller 4 serving as a rotating body that conveys the sheet 5 and the sheet discharging roller 13 are connected to the sheet feeding motor 30.
3, a carrier driving unit 34 for driving the ink cartridge 9, a carrier driving unit 36 for driving a carrier motor 35 connected to the carrier on which the ink cartridge 9 is mounted, a head driving unit 37 for driving the inkjet head 3, and the switch. An electromagnetic coil drive section 39, which is a drive means for driving the electromagnetic coil 38 in response to a detection signal from (detection means) 25, is connected. Further, the switch 25 and the jam sensor 40 are connected to the CPU 30. The electromagnetic coil 38 is arranged near the lower surface of the detent arm 16 as shown in FIGS. 1 and 2.

In such a structure, the transport motor 33
When the paper feed roller 4 and the paper discharge roller 13 are driven by the clockwise direction, the detent gear 15 also rotates clockwise, and the teeth of the detent gear 15 and the detent arm 1 are rotated.
The detent arm 16 is separated from the detent gear 15 by the component force generated by the contact with the tip of the sheet feeding roller 6, and the sheet feeding roller 4 is allowed to rotate clockwise. This allows
The paper 5 is fed to the front surface of the inkjet head 11 by the paper feed roller 4, is printed by the inkjet head 11, and is conveyed upward by the paper feed roller 4 and the paper discharge roller 13.

When a jam occurs, its state is detected by the jam sensor 40, and the state of the jam is also displayed on a display (not shown). In this case, the lever 23 is rotated clockwise as shown in FIG. As a result, the upper portion of the paper guide plate 7 becomes free, and the paper guide plate 7 can be removed from the housing 18 by pulling up the protrusions 26 on both sides of the paper guide plate 7 from the guide grooves 28 of the frame 27.
The switch 25 is turned on by the rotational movement (jamming operation) of the lever 23 at this time. The detection signal from the switch 25 causes the electromagnetic coil drive unit 39 to move to the electromagnetic coil 38.
Since the excitation voltage is applied to the detent arm 16, the detent arm 16 is separated from the detent gear 15. Therefore, the paper feed roller 4 can be lightly rotated manually in any direction with the transport motor 33 stopped. Therefore, the paper 5 can be pulled out in either the paper feed path 1 side or the paper discharge roller 13 side depending on the location where the jam occurs. Further, since the paper feed roller 4 can be lightly rotated by the pulling force of the paper 5, it is possible to avoid the state in which the paper feed roller 4 is unevenly worn and extend the life.

When the operation of opening the cover 19 is a jam clearance operation, detection means for detecting the opening operation of the cover 19 is provided, and the electromagnetic coil 38 is excited by the detection signal of this detection means. Good. Further, the electromagnetic coil 38 may be excited by a detection signal of a jam sensor (detection means) 40 that detects the occurrence of a jam. Further, the rotating body that conveys the paper 5 is not limited to the paper feed roller 4, and a belt may be used.

[0015]

According to the present invention, an electromagnetic coil having an attractive force for separating the detent arm from the detent gear rotating with the rotating body for conveying the sheet is provided, and the detecting means for detecting the occurrence of jam or the jam processing operation is performed. Since the driving means for outputting the exciting voltage to the electromagnetic coil is provided by the detection signal of 1., when a jam occurs, the detection signal of the detecting means for detecting the occurrence of the jam or the detecting means for detecting the jam processing operation is used as a basis. In addition, the electromagnetic coil is excited by the driving means to separate the detent arm from the detent gear, which allows the rotating body for conveying the paper to be in a free state, which allows the rotating body to be moved in any direction by hand. It can be rotated lightly, so the paper can be pulled out in the desired direction depending on the location of the jam, and It is possible to rotate lightly rotating body pulling force, can be rotational body to extend the life by avoiding the state of uneven wear.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional side view showing a state in which a paper guide plate is released as a jam clearance operation.

FIG. 3 is a partial exploded perspective view showing a support structure for a paper guide plate.

FIG. 4 is a block diagram showing an electronic circuit.

FIG. 5 is a vertical cross-sectional side view showing the internal structure of a conventional printing device.

[Explanation of symbols]

 4 Rotating Body 5 Paper 15 Detent Gear 16 Detent Arm 25 Detecting Means 38 Electromagnetic Coil 39 Driving Means 40 Detecting Means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsutomu Yamaguchi 570 Ohito, Ohito-cho, Takata-gun, Shizuoka Prefecture Tokyo Electric Co., Ltd. Ohito factory

Claims (1)

[Claims] 1. A rotary body that conveys a sheet, a detent gear that rotates in synchronization with the rotary body, a displaceable detent arm that is biased in one direction and meshes with the detent gear, and the detent arm. It is composed of an electromagnetic coil having an attracting force to separate it from the detent gear, a detection means for detecting a jam occurrence or a jam processing operation, and a drive means for outputting an exciting voltage to the electromagnetic coil by a detection signal from the detection means. A paper transport device characterized by the above.