JPH0423751A - Sheet material feeding device - Google Patents

Abstract

PURPOSE:To feed the sheet material of the top side while feeding next sheet material at a dislocated timing for lap feeding by providing a control means for switching direction of the rotation of a feeding rotating member and an auxiliary rotating member respectively for control. CONSTITUTION:Direction of the rotation of a feeding rotating member 12 and an auxiliary rotating member 13 are respectively switched for control. As a result, a sheet material 1a of the top side is fed by a feeding rotating member 12, and while next sheet material 1b is fed at a dislocated timing for lap feeding by the auxiliary rotating member 13. Consequently, existence of the sheet material 1 can be detected sequrely by a detecting means 14 independently of type of the sheet material 1.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a sheet material feeding device for feeding sheet materials commonly used in recording devices such as electronic typewriters, copying machines, and printers. It is.

<Prior Art> Conventionally, recording devices such as electronic typewriters and printers are equipped with sheet material feeding devices for feeding sheet materials.

The above sheet material feeding bag! Generally, a reflective photosensor is installed near the platen roller of the recording device to detect the presence or absence of a sheet material.After this reflective photosensor detects that the sheet material has been fed, the sheet material is The platen roller is further rotated to transport the sheet material to the recording means.

<Problems to be Solved by the Invention> However, according to the above configuration, since the presence or absence of a sheet material is detected by a photosensor, the types of sheet materials that can be detected are limited by the characteristics of the sensor itself.

For example, if the thickness of the sheet material is thin and the light reflection is weak, even if the sorting material passes through the sensor, the photo sensor will not be able to obtain a sufficient output current, and the presence or absence of the sheet material will not be determined. As a result, the feeding operation of the sheet material may not be performed smoothly.

An object of the present invention is to solve the above-mentioned problems of the prior art, and to provide an auxiliary rotary body for feeding the sheet material separately from the feeding rotary body for feeding the sheet material, so that the sheet material can be detected reliably by the detection means. The objective is to provide a sheet material feeding device that can

<Means for Solving the Problems> Means for solving the problems of the above-mentioned prior art and applicable to the embodiments described below include a feeding rotary body for feeding or reverse feeding the sheet material, and a feeding rotation body for feeding or reverse feeding the sheet material, an auxiliary rotating body for feeding or reversing the sheet material provided close to the rotating body;
A control means for switching and controlling the rotation directions of the feeding rotary body and the auxiliary rotary body, respectively, and a detection means for detecting the presence or absence of the sheet material fed by the feeding rotary body and the auxiliary rotary body. It is characterized by having.

<Operation> According to the above configuration, by switching and controlling the rotation directions of the feeding rotary body and the auxiliary rotary body, respectively, by the control means,
The uppermost notebook material can be fed by the feeding rotary body, and the next sheet material can be stacked and fed at a different timing by the auxiliary rotary body.

Therefore, the detection means can reliably detect the presence or absence of the sheet material, regardless of the type of sheet material.

<Example> Hereinafter, an example of a sheet material feeding device to which the present invention is applied will be described with reference to the drawings. In this embodiment, a case will be described in which an electronic typewriter is equipped with a sheet material feeding device.

FIG. 1 is an explanatory diagram of the configuration of a recording device, and FIG. 2 is an explanatory diagram of the entire configuration of an electronic typewriter.

First, the overall structure of the electronic typewriter will be explained with reference to FIG.

In Fig. 2, when recording information is input by operating keypad 1"K, the information is displayed on display D. After inputting recording information, when sheet material 1 is pressed and the recording start key is operated, the recording device P is driven, input information is output to the sheet material 1, and recording is performed.

The recording device WP uses a daisy-wheel recording method in this embodiment, and as shown in the first part, the ink ribbon cassette 9 is removably loaded into the carriage 2, and the carriage 2 is equipped with an ink ribbon cassette 9. Recording means 3 is loaded.

The carriage 2 is movable by being guided by a guide shaft 4 and one end surface 5a of the main body frame 5, and by moving the carriage 2 to a desired position and driving the recording means 3, printing is recorded on the sheet material l. The sheet material 1 is conveyed in the direction of arrow a by the sheet material conveying means 6 every time the printing of the negative line is completed.

In this embodiment, the recording means 3 performs so-called bidirectional incremental recording, in which recording is performed when the carriage 2 moves in either the space direction F or the base direction R.

The carriage 2 is connected to a carriage motor 7 consisting of a pulse motor via a driving force transmission means 8, and is reciprocated by forward and reverse rotation of the carriage motor 7.
Further, the drive is controlled by a control means (not shown) while correcting the distortion generated in the drive force transmission means 8.

The ink ribbon cassette 9 has a recess 9a formed in the center of the front part of the container, and a long ink ribbon 9b is wound around a supply spool (not shown) provided inside the container, with one end exposed outside in the recess 9a. It is taken up on the take-up spool. This take-up spool has a drive transmission roller 9c.
The ink ribbon 9b is wound up by connecting the roller 9C to a winding shaft, which will be described later, and driving and rotating it. Furthermore, positioning posts 9d for positioning when loading the cassette 9 into the carriage 2 are protruded from both sides of the cassette 9.

The carrying engine 2 is equipped with a recording means 3, and
The ink ribbon cassette 9 is loaded and moved. Hooks 2b that are rotatable around a shaft 2a are provided on both sides of the carriage 2, and these hooks 2b are biased by a tension spring 2C, and a positioning boss 9d for the ink ribbon cassette 9 is provided. When the ink ribbon cassette 9 is fixed to the hook 2b, the ink ribbon cassette 9 is pressed against the upright wall 2d of the carriage 2, and at this time, the ink ribbon 9b exposed from the recess 9a is located between the type wheel 3a and the sheet material l, which will be described later. It is configured as follows.

Further, a take-up shaft 2e is provided at a predetermined position of the carriage 2, and the ink ribbon cassette 9 is moved onto the carriage 2.
When loaded, the drive transmission roller 9C is configured to fit with the take-up shaft 2e.

A ribbon motor 2g is connected to the take-up shaft 2e via a set of gears 2f, and the ink ribbon 9b is wound onto a take-up spool by driving the motor 2g.

The recording means 3 uses a daisy type element, and a hammer 3c operated by a type wheel 3a and a solenoid 3b is mounted on the carriage 2.

The type wheel 3a has type letters arranged radially around a rotating shaft, and is rotationally driven by a wheel motor 3d connected to the rotating shaft. Therefore, by rotating the type wheel 3a, the desired type can be applied to the hammer 3.
By facing the ink ribbon 9b and driving the hammer 3c to strike the ink ribbon 9b, printing can be performed on the back side of the sheet material l supported by the platen roller 6a.

As shown in FIG. 1, the sheet material conveying means 6 is disposed opposite to the operating axis of the hammer 3c, and a platen roller 6a provided in the movement area of the carriage 2 is rotationally driven by a platen motor 6b. It is something that

A guide plate 6c is attached to the periphery of the platen roller 6a, and a plurality of pinch rollers 6d are attached so as to press against the platen roller 6a.

Sheet material 1 fed by sheet material feeding device 10 described below
The ink ribbon is conveyed in cooperation with the platen roller 6a and the pinch roller 6d, is guided by the guide plate 6c, passes between the platen roller 6a and the ink ribbon 9b, and is conveyed in the direction of arrow a in FIG. It is something that will be done.

The driving force transmitting means 8 is for transmitting the driving force of the carriage motor 7 to the carriage 2, and as shown in FIG. 1, a driving pulley 8a and a driven pulley 8b are attached to both ends of the carriage movement range. A timing heald 8c is placed between these pulleys 8a and Bb of approximately 0.
The belt 8c is loosely stretched with a tension of about 7 kg and is connected to the carriage 2. Furthermore, a pulley gear 8d consisting of a negative gear is integrally attached to the drive pulley 8a, and this gear 8d meshes with a motor gear 8e attached to the drive shaft of the carriage motor 7.

As a result, when the carriage motor 7 rotates in the forward and reverse directions, its driving force is reduced by the gears 8d and 8e and transmitted to the carriage 2, and the carriage 2 reciprocates along the guide shaft 4.

Next, the sheet material feeding device 10 applied to the above device will be explained with reference to FIG. 3.

In the third recess, 11 is a feeding tray on which the sheet material 1 is loaded so as to be feedable. Inside this feeding tray 11, an intermediate plate 11a for stacking sheet materials 1 is provided. This intermediate plate 11a is held at a height that allows the sheet material to be fed by a pressure spring llb provided on the back surface on the side in the sheet material feeding direction (hereinafter simply referred to as r downstream side j).

A feeding roller 12, which is a feeding rotary body for feeding the sheet material, is provided near the feeding tray 11. Further, an auxiliary feeding roller 13, which is an auxiliary rotating body, is provided adjacent to the feeding roller 12. The rotation direction of the feeding roller 12 and the auxiliary feeding roller 13 can be switched to the feeding direction or the reverse feeding direction, respectively, by a control means to be described later.

A paper end sensor 14 is provided on the downstream side of the feeding roller 12 and the auxiliary feeding roller 13, which is a detection means for detecting the collection of the fed sheet material l. This paper end sensor 14 uses a reflective photomicrosensor, which irradiates light from a light emitting element and converts the reflected light obtained from the sheet material into a current value with a light receiving element, detecting the presence or absence of sheet material. This is to detect.

When the vapor end sensor 14 detects that the sheet material 1 has been fed, the sheet material 1 is conveyed by a certain amount to the downstream side, and the platen roller 6a is further rotationally driven to record the sheet material 1. It is for conveying to means 3.

On the downstream side of the vapor end sensor 14, an auxiliary roller 15a capable of feeding the sheet material 1 and an auxiliary valve 15b in contact with the roller are provided.

Next, the control system of the sheet material feeding apparatus 100 will be explained with reference to the block diagram shown in FIG.

The control circuit 16 includes a CPU 16a that controls the entire device, and an R circuit that stores control contents and various data shown in FIG.
RA that is used as a workstation for the OM16b and the CPU16a and also temporarily stores various data.
It consists of an M16c, an interface 16d, etc.

A vapor end sensor 14 that detects that the sheet material 1 is fed from the sheet material feeding device IO is connected to the input port of the interface 16d. Further, a feeding roller drive circuit 17, a feeding auxiliary roller drive circuit 18, an auxiliary roller drive circuit 19, etc. are connected to the output port of the interface 16 (I).

The control circuit 16 receives a detection signal regarding the presence or absence of the sheet material 1 from the vapor end sensor 14, and receives a feed roller drive circuit 17, a feed auxiliary roller drive circuit I8, and an auxiliary roller drive circuit from the control circuit 16. 19 via the feed roller 12. Feeding auxiliary roller 13 auxiliary roller 1
A drive or drive stop signal of 5a is output, respectively.

Next, the control operation of the control circuit 16 will be explained with reference to the flowchart of FIG. 9 and the feeding operation of the sheet material 1 shown in FIGS. 3 to 7.

In the flowchart shown in FIG. 9, first, step S
1, when the sheet material 1 is loaded on the feeding tray 11 and the feeding operation is started, the control circuit 16 controls the feeding operation via the feeding roller drive circuit 17 and the feeding auxiliary roller drive circuit 18. The roller 12 and the feeding auxiliary roller 13 are each rotated clockwise as shown in FIG. At this time, the feed end auxiliary roller 13 pushes back the edges of the second and subsequent sheet materials 1 loaded on the feed tray 11 so that more than one sheet material 1 is not fed. There is.

Therefore, only the uppermost sheet material 1a stacked on the feeding tray 11 is fed downstream by the feeding roller 12.

Next, in step S2, when the first sheet material 1a is fed by a certain amount by the feeding roller 12, the control circuit 16 controls the feeding auxiliary roller via the feeding auxiliary roller drive circuit 18. 13 is switched and rotated counterclockwise.

At this time, as shown in FIG. 4, the second sorted material 1b loaded on the feeding tray 11 is fed downstream behind the first sheet material 1a.

The first and second sheet materials 1a and 1b are
Due to the cooperative action of the feeding roller 12 and the feeding auxiliary roller 13, they are fed together to the downstream side in an overlapping state.

Next, proceeding to step S4, the vapor end sensor 14
The presence or absence of the sheet material 1a is detected by determining whether or not is turned on. As mentioned above, since the sheet material 1aib is conveyed in two layers, even if there is a possibility that the sensor 14 may not be able to obtain a sufficient output current with only one sheet material, the presence or absence of the sheet material la can be reliably detected. can be detected.

If the vapor end sensor 14 is in the ON state, the process moves to step S5, and the first and second sheet materials 1a and 1b are conveyed downstream by a certain amount while being overlapped. At this time, the auxiliary roller 15a provided on the downstream side of the vapor end sensor 14 is connected to the auxiliary roller drive circuit 1.
The sheet material 1a, 1b is rotated in the counterclockwise direction via the shaft 9 to convey the sheet materials 1a, 1b by a predetermined amount to the downstream side and then stopped. Further, the vapor end sensor 14 detects the sheet material 1a.
After a certain period of time has passed since the presence or absence of the sheet material 1b is detected (immediately after the rear end of the second sheet material 1b passes the feeding auxiliary roller 13), the feeding auxiliary roller drive circuit 18 controls the rotation of the feeding auxiliary roller 13. By switching the direction and rotating it clockwise, the edge is pushed back so that the third and subsequent sheet materials 1 loaded on the feeding tray 11 are not fed.

Next, the process moves to step S6, and as shown in FIG.
The leading edge of the second sheet material 1a is conveyed to the platen roller 6a, and the leading edge of the second sheet material 1b is conveyed to the auxiliary roller 15.
When the first sheet material 1 is conveyed to the intermediate point between the sheet material 1 and the platen roller 6a, the platen motor 6b rotates the platen roller 6a, as shown in FIG.
a to the recording means 3. Further, the feeding roller driving circuit 17 switches the rotational direction of the feeding roller 12 and rotates it counterclockwise, and the cooperative action of the feeding roller 12 and the feeding auxiliary roller 13 causes the feeding roller 12 to rotate counterclockwise. 1b is reversely conveyed and returned to the feeding tray 11 by a predetermined amount. The above feeding roller 12 and feeding auxiliary roller 1
3, the second sheet material 1b is placed at a predetermined position in the direction of the feeding tray 11 (sheet material 1 shown in FIG.
After a has been conveyed to a position where a has been fed a predetermined amount downstream, the drive is stopped.

Next, the process moves to step S7, and it is determined whether or not there is a feeding command for the sheet material 1. If there is a feeding command, the process returns to step S3, and the second sheet material 1b is fed. The same feeding operation described above is repeated. Further, if there is no feeding command, the feeding operation of the sheet material 1 is ended.

Further, in the step S4, if the paper end sensor 14 is in the OFF state, it is determined that a jam (paper jam) has occurred in the sheet material 1, and the process proceeds to step S8, where the feed roller 12 and The driving of the feeding auxiliary roller 13 is stopped to stop the feeding operation of the sheet material 1a1b.

In this embodiment, the sheet material feeding device 10 is applied to an electronic typewriter as a recording device, but other recording devices such as a laser beam printer,
It is also possible to apply it to bubble jet printers and the like.

<Effects of the Invention> As described above, the present invention allows the uppermost sheet material to be fed by the feeding rotary body by switching and controlling the rotational directions of the feeding rotary body and the auxiliary rotary body using the control means. At the same time, the next sheet material can be fed in an overlapping manner with a shifted timing by the auxiliary rotating body.

Therefore, the presence or absence of the sheet material can be reliably detected by the detection means regardless of the type of sheet material, etc., and smooth feeding operation of the sheet material can be maintained.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the configuration of the recording device, Fig. 2 is an explanatory diagram of the entire configuration of an electronic typewriter, Figures 3 to 7 are explanatory diagrams showing the feeding operation of the sheet material feeding device, and Fig. 8 is a block diagram of the control system, and FIG. 9 is a flowchart showing the control contents. K is the keyboard, D is the display, P is the recording device, ■
is a sheet material, 2 is a carriage, 2a is a shaft, 2b is a hook, 2c is a tension spring, 2d is an upright wall, 2e is a winding shaft, 2f is a set of gears, 2g is a ribbon motor, 3 is a recording means, 3a is a printing type Wheel, 3b is a solenoid, 3C is a hammer, 3d is a wheel motor, 4 is a guide shaft, 5 is a main body frame, 5a is an end surface, 6 is a sheet material conveying means, 6a
is a platen roller, 6b is a platen motor, 6C is a guide plate, 6d is a pinch roller, 17 is a carriage motor, 8 is a driving force transmission means, 8a is a drive pulley, 8b
is a driven pulley, 8c is a timing heald, 8d is a pulley gear, 8e is a motor gear, 9 is an ink ribbon cassette, 9a is a recess, 9b is an ink ribbon, 9c is a transmission roller, 9d is a positioning boss, 10 is a sheet material feeding device, 11 is a feeding tray, lla is an intermediate plate, Ilb is a pressure spring, 12 is a feeding roller, 13 is an auxiliary feeding roller, 14
is a vapor end sensor, 15a is an auxiliary roller, 15b
is an auxiliary valve, 16 is a control circuit, 16a is a CPU 16b is R
OM, 16C is RAM, 16d is interface, 1
7 is a feed roller drive circuit, 18 is a feed auxiliary roller drive circuit, and 19 is an auxiliary roller drive circuit.

Claims (1)

[Scope of Claims] A feeding rotating body for feeding or reversing the sheet material; and an auxiliary rotating body for feeding or reversing the sheet material, which is provided in close proximity to the feeding rotating body. , a control means for switching and controlling the rotation directions of the feeding rotary body and the auxiliary rotary body, respectively; and a detection means for detecting the presence or absence of the sheet material fed by the feeding rotary body and the auxiliary rotary body. A sheet material feeding device having: