JPH0645974Y2 - Paper feeder - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a case where a sheet material is sent along a conveying path to a mechanism of the next stage, for example, a transfer roll of a copying machine to which a sheet as a sheet material is to be supplied. The present invention relates to the control of a transporting device for performing alignment and feeding in the middle of a transporting path.

[Conventional technology]

Conventionally, as a conveying device of this type, as disclosed in Japanese Patent Application Laid-Open No. 51-78338, a next gripping device for a transfer roll in a color copying machine that performs multiple transfer is made to grip a sheet as a sheet material. There is something. That is, this is one in which the paper stored in the cassette is fed out one by one, and when the leading edge of the fed paper is gripped by the next gripping device, the timing of the feeding is performed by the roll portion provided in front of the transfer roll. Then, after performing such timing adjustment, the leading edge of the paper is sent to the next gripping device and wound around the transfer roll in order to be gripped by the next gripping device.

By the way, when the sheets are sent out one by one like this, when they are sent out by the roll again at a certain timing in the middle for alignment, if the delivery is performed in a state where the speed of the roll is not stable, Trouble at the time of gripping is induced such as not being properly gripped, and this causes an increase in jam or miscopy.

[Problems to be solved by the invention]

The present invention is intended to solve the above-described problem of a trouble at the time of feeding when the sheet material is once aligned and is fed again to the next stage mechanism to be fed.

[Means and Actions for Solving Problems]

In this invention, the sheet material is wound around the outer periphery of the transfer roll with the tip of the sheet material being gripped by a gripping device, and an image is transferred onto the sheet material wound around the surface of the transfer roll in multiple layers. An image forming apparatus for forming a sheet of paper, the tip of the sheet material sent along the conveying path is sent to the gripping device of the transfer roll, and the sheet material is continuously conveyed to the transfer roll. And a gate for temporarily stopping the sheet material for alignment in front of the conveyor roll, and opening the gate to feed the leading edge of the sheet material to the transfer roll gripping device by the conveyor roll. In addition, prior to the opening of the gate, the transport roll is driven in a stable state at a rotation speed higher than the normal rotation speed, and after the gate is opened, the normal rotation is continued for a predetermined time. After driving at a faster speed than the degree, and is configured to have a control means for controlling to drive the transport roll in the normal rotational speed.

Therefore, the transport roll is driven in a stable state at a higher rotation speed than the normal rotation speed prior to opening the gate, so that the rotation speed of the transport roll can be stabilized in advance. Moreover, since the transport roll is driven at a rotation speed higher than the normal rotation speed prior to the opening of the gate, and is driven at a speed higher than the normal rotation speed for a predetermined time even after the opening of the gate, The momentum of the transport roll when the transport roll starts transporting the sheet material is set to be larger than that in the normal state. Therefore, a large amount of momentum acts on the sheet material in which the rear end portion is stopped or is sandwiched by takeaway rolls or the like that start rotating with a delay and is in a stopped state, and the sheet material is stabilized. Since the sheet can be conveyed at the above-described conveying speed, the leading edge of the sheet material can be reliably delivered to the gripping device of the transfer roll, and troubles such as conveyance failure of the sheet material and jam can be surely prevented.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show the structure of an apparatus according to an embodiment of the present invention, and show the case where the apparatus is applied to a copying machine which carries out multiple transfer by means of a transfer roll as described above.

In FIG. 1, (1) is a feed roll for feeding the paper (2) stored in the cassette, (3) is a T / W roll (takeaway roll) for further advancing the fed paper (2) along the transport path, (4) is a transport roll (feeding roll), (5) is a transport roll idler, which is provided near the roll (3) when the leading end of the fed paper (2) is gripped by the roll (3). Sensor to detect
In addition to the S1 provided, in front of the registration race roll section composed of the transport roll (4) and the transport roll idler (5), the next-stage device to which the paper (2) is to be fed, In the example, when the paper (2) is supplied to the gripping device (7) of the transfer roll (6) for performing the multiple transfer as shown in FIG. 2, the papers sent out one by one from the cassette. In order to align (2) once, there is provided a registration resolution gate (8) which is stopped before the registration race roll section. Regarding the installation of the gate (8) for this alignment, as shown in FIG.
Since the transport roll (4) and the transport roll idler (5) are axially divided into a plurality of roll parts and idler parts,
It is provided at a point between them, and is in the pivoted position shown in FIG. 2 when the paper (2) is held for alignment, and when it is fed out by the transport roll (5). It can be rotated clockwise from the position.

In the above configuration, when the paper (2) stored in the cassette is sent out one by one, and the paper (2) is sent to the gripping device (7) via the T / W roll (3) and the transport roll (4), The gate (8) is used to stop the paper (2) for alignment, and the clutch (T / W CL) of the roll (3) is moved a predetermined time after the sensor S1 detects the lead edge of the paper (2). ) Is turned off, but when the paper (2) is once aligned and fed again by the transport roll (4) in this way, a friction clutch (acceleration C
L) is connected before the alignment gate (8) is opened, and the transport roll (4) is rotated at an increased speed. Further, the gate (8) is opened by previously transporting the transport roll (4) as described above. Accelerate and perform when stable condition is reached. That is, when the paper (2) is sent out by the transport roll (4) to be gripped by the gripping device (7), the transport roll (4) is accelerated to ensure that the gripping device (7) grips the paper.
This speed-up start is performed at the time when the gate (8) is turned on, that is, a little earlier than the opening, and when the rotation has risen sufficiently to reach a stable speed range, the gate (8) is opened and the transfer roll (4) is opened. The transfer roll (6) is smoothly fed to the gripping device (7) via the timing.

FIG. 4 is an example of an operation timing chart when the registration mechanism shown in FIGS. 1 to 3 is used. FIG. 4 (a) is a clutch (feed C) of the feed roll (1).
L), FIG. 7B shows the operation of the clutch of the T / W roll (3), FIG. 7C shows the operation of the registration race roll part, and FIG. 7D shows the operation of the registration race gate (3). 8) and FIG. 8E show the operation of the optical registration position sensor. In addition, in FIGS. 9B and 9C, the period marked with “× 1.4” indicates the period of speed-up rotation.

To feed the paper (2) into the gripping device (7) of the transfer roll (6), first press the start button on the console panel of the copying machine to start the copying operation, as shown in FIG. As shown in (a), the sheet of paper (2) is fed out from the cassette by turning on the clutch of the feed roll (1) after a certain period of time.
When the tip of the sensor is detected by the sensor S1 and the sensor S1 is turned on, the clutch of the feed roll (1) is turned off. On the other hand, at this time, the clutch of the T / W roll (3) is also turned on after a certain time has elapsed from the start of the copying operation and during the period when the clutch of the feed roll (1) is on, and the sensor S1 Even if is turned on, the on-state is still maintained, and as shown in FIG. 4 (b), the T / W roll (3) after a lapse of a certain time after the sensor S1 is turned on.
The clutch is turned off. In this way, the clutch of the T / W roll (3) keeps driving the T / W roll (3) until a certain time elapses after the sensor S1 is turned on, and as shown in FIG. In the case of (2), it is possible to secure a stable loop amount in the registration race roll section.

The sheet (2) sent from the cassette and temporarily stopped by the gate (8) for alignment is then sent again by the transport roll (4) by opening the gate (8). In this case, as shown in FIG. 4 (c), when the conveyance roll (4) is rotated at an increased speed before the gate (8) is opened and becomes stable, the gate (8) is opened and the paper (2) is opened. Is delivered by the transport roll (4) which has been accelerated and is in a stable rotation state. That is, the paper (2) is sent out to the transport roll (4) whose speed is increased in advance. At this sending time, as shown in FIG.
The reason for increasing the speed of the T / W roll (3) is to synchronize it with the transport roll (4).

In this way, the clutches of the transport rolls (4) are connected to each other a little faster than the registration race gate (8) is turned on,
By turning up the rotation, the paper (2) can be sent out in a stable speed range, so it is possible to prevent troubles when gripping the paper when it is sent out in a state where the speed is not stable, and to make sure the timing of the gripping device (7). It can be held well.

FIG. 5 shows that when the transport roll (4) is rotated at an increased speed before the gate (8) is opened, the gate (8) becomes stable.
The following shows an example of a control system for controlling to open the switch, (9) is a power switch, (10) is an operation switch such as a start button on the console panel, and (11) is a registration position sensor. Information from S1 is given to the control unit (13) via the input interface (11). The control unit (13) stores a central processing unit (CPU) (14) of the microcomputer, a random access memory (RAM) (15), and a program as shown by a flow chart in FIG. 6 in advance. It consists of a read only memory (ROM) (16), the CPU (14) executes the control program based on the information given from the start button, sensor S1, etc., and feed rolls via the output interface (17). Drive unit (18) and clutch (19),
T / W roll drive unit (20) and clutch (21), transport roll drive unit (22) and clutch (23), gate drive unit (2)
4) And, control signals are sent to other output devices of the copying machine to operate them at the above-mentioned operation timing.

Although the above embodiment has been described by taking the case of a copying machine that performs multiple transfer as an example, the present invention is not limited to this. Even in a copying machine that requires a sheet material to be prepared in the middle of the conveyance path, for example, a copying machine that obtains a single color copy of normal black, the alignment is performed on the way. It is possible to prevent problems such as jams and miscopying.

[Effect of device]

As described above, according to the present invention, the sheet material to be conveyed can be temporarily adjusted by the aligning gate, and the sheet material can be sent out to the conveyance roll that has been accelerated in advance and in a stable rotation state. It is possible to prevent the occurrence of troubles when supplying to the mechanism of the next stage to be supplied, and it is possible to surely supply at a timely timing.

Moreover, when the alignment gate is opened and the leading edge of the sheet material is fed to the transfer roll gripping device by the transport roll, the transport roll is driven at a rotation speed faster than the normal rotation speed prior to the opening of the gate. Since it is configured to drive in a stable state at a rotation speed higher than the normal rotation speed for a predetermined time even after the gate is opened,
The transport roll is accelerated in advance and is in a stable rotation state, and since it is rotationally driven at a speed higher than the normal rotation speed, it is applied to the sheet material in the stopped state. The amount of exercise is larger than in the normal state. Therefore, even though a slight leap is formed at the tip, the sheet material that is in a stopped state at the rear end is stopped or is sandwiched by takeaway rolls or the like that start rotating with a delay. The transfer roll exerts a large amount of momentum and is transported at a stable transport speed, so that the leading edge of the sheet material can be reliably delivered to the gripping device of the transfer roll, and problems such as poor transport of the sheet material and jams can be prevented. It is possible to reliably prevent the occurrence.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an apparatus according to an embodiment of the present invention, FIG. 2 is a partially enlarged view of a sheet feeding side, FIG. 3 is a perspective view of a registration race roll section, and FIG. 4 is a description of the operation of each section. Timing chart, FIG. 5 is a block diagram showing an example of the configuration of the control system, and FIG. 6 is a flow chart showing an example of the control operation. [Explanation of symbols] (2) …… Paper, (4) …… Conveying roll (6) …… Transfer roll, (7) …… Gripping device (8) …… Registration gate (13) …… Control unit

Claims (1)

[Scope of utility model registration request] 1. A sheet material is wound around the outer periphery of a transfer roll in a state where a tip of the sheet material is held by a holding device, and images are transferred in multiple layers onto the sheet material wound around the surface of the transfer roll. An image forming apparatus for forming an image, which normally feeds a sheet material fed along a conveyance path to a gripping device of a transfer roll and subsequently conveys the sheet material to a transfer roll. A transport roll that is driven to rotate at a speed, a gate that temporarily stops the sheet material for alignment before the transport roll, and a gate that opens this gate and sends the leading edge of the sheet material to the transfer roll gripping device by the transport roll. At that time, prior to the opening of the gate, the transport roll is stably driven at a rotation speed higher than the normal rotation speed, and after the gate is opened, the normal rotation is continued for a predetermined time. After driving at a faster speed than the degree, sheet transportation device, characterized in that a control means for controlling to drive the transport roll in the normal rotational speed.