JP2673018B2 - Roll paper cutting device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll paper cutting device for cutting and discharging roll paper.

[Conventional technology]

Generally, in an image forming apparatus such as a copying machine, as a means for feeding a transfer sheet to an image forming position, cut paper cut in advance to a standard size is fed from a sheet cassette built in the apparatus, or is manually fed. A structure of inserting one by one is used. However, when the size of the transfer paper is increased, a huge space is required to store the transfer paper.In recent years, roll paper wound in a roll shape is set in a dedicated roll paper cutting device, After the paper is cut into a desired size by this apparatus in advance, the cut roll paper (transfer paper) is supplied into the image forming apparatus from a transfer paper insertion port.

By the way, in such a roll paper cutting device, when the roll paper is first set in the device, it is necessary to align the leading end position of the roll paper, but conventionally, the operator was provided on the side part of the device. There is a work in which the leading edge of the roll paper inside the device is confirmed through a small window and the position is manually adjusted.

[Problems to be solved by the invention]

In the above work, the alignment of the leading edge of the roll paper is performed based on the visual sense of the operator, so accurate alignment is difficult, and inevitably there is a large variation in the cut dimensions for the cutting of the first sheet. Occurs. Therefore, in such a conventional apparatus, the first cut sheet is often not used, which is uneconomical.

In view of such a situation, the present invention provides accurate positioning of the leading edge when setting the roll paper,
An object of the present invention is to provide a roll paper cutting device that can be suitably used from the first piece of cut paper.

[Means for solving the problem]

The present invention comprises a conveying means for conveying a built-in roll paper, a driving means for driving this conveying means, and a cutter for cutting the conveyed roll paper in the middle thereof, so that the roll paper is cut and discharged. In the roll paper cutting device configured as described above, a roll paper detection unit that is provided on the downstream side of the cutting position by the cutter and detects the leading end of the roll paper, conveys the roll paper in the discharge direction, and And a control means for controlling the drive of the transport means so as to transport the roll paper in a direction opposite to the discharge direction by a preset amount when the leading edge is detected by the roll paper detection means. .

(Operation)

According to the above configuration, after setting the roll paper at an appropriate position in the roll paper cutting device, the roll paper is conveyed in the discharge direction by the conveying means, and when the leading end reaches the detection position by the roll paper detecting means. Since the roll paper is fed back and moved by a predetermined amount and then stopped, the leading end of the roll paper is always positioned at a position a certain distance before the detection position of the roll paper detection means.

〔Example〕

FIG. 3 shows the overall configuration of a copying machine equipped with a roll paper cutting device 12 according to an embodiment of the present invention.

The main body 10 of this copying machine is composed of a copying section 14 and a transfer paper stock table 16 which supports the copying section 14.

FIG. 4 shows the internal structure of the copying section 14. In the copying unit 14, the transfer paper in the lower paper feed cassette 18 is the paper feed roller pair 20, 22 and the registration roller pair 24.
While being conveyed to the upper photosensitive drum 26 through
Transfer paper insertion port 28 provided on the front side (right side in FIG. 4)
The transfer paper inserted from is also fed into the copying section 14 through the pair of paper feed rollers 22.

Around the photosensitive drum 26, in the order of its rotation, a main charging device 30, a developing device 32,
24, a transfer / separation device 34, a cleaning device 36, and the like are provided, and a fixing unit 38 and a discharge roller pair 40 are provided at positions downstream (front side) in the transfer paper transport direction with respect to them.

A document supply passage 42, an exposure unit 44, and a document reversing member 45 are sequentially provided on the upper surface of the copying unit 14, and the exposure unit 44 is
It is provided with a plurality of rollers 46 for conveying originals, an exposure lamp 48, a self-hook lens 50, and the like.

In the copying section 14, a paper empty switch 52 for the inside of the sheet cassette 18 and the sheet cassette 18
Is provided with a cassette insertion switch 54, and a jam detection switch 56 to
59 are provided. Further, the document supply passage 42, the transfer / separation device 34, the fixing portion 38, the discharge roller pair 40, and the like are incorporated in a common unit housing 60.

As shown in FIG. 3, in the transfer paper stock table 16, there is a transfer paper stock tray 61 inclined to the front side,
The transfer paper guide plate 62 and the transfer paper guide plate 62 are provided.
Is rotatable between a position along the front wall of the transfer paper stock base 16 (position indicated by the solid line in FIG. 3) and a position projecting forward from the front wall (position indicated by the chain double-dashed line in FIG. 3). ing. Above the transfer paper stock tray 61, a transfer paper pressing member 63 including a lumirror etc. is arranged.

The roll paper cutting device 12 is attached to the front side wall of the transfer paper stock table 16 via a guide rail (not shown) so as to be able to move up and down, and is driven by a drive motor 82 (see FIG. 2 described later) of the roll paper cutting device 12. It goes up and down along the guide rail.

Further, a transfer paper discharge tray 99 (see FIG. 3) that is opened obliquely upward is provided above the roll paper cutting device 12, and the roll paper cutting device 12 is at the upper limit position (the position shown by the solid line in FIG. 3). In this state, the transfer paper discharged from the discharge roller pair 40 is stocked in the transfer paper discharge tray 99.

Next, the internal structure of the roll paper cutting device 12 will be described with reference to FIG.

In the roll paper cutting device 12, a roll shaft 93 of a roll paper 92 is mounted so as to be able to move up and down along a long hole 94 provided in a side wall of the device. A pair of transport rollers 95 and 96 are rotatably provided at the lower portion of the apparatus, and the roll shaft 93 is urged downward by a spring (not shown). Regardless of the transport roller
The entire roll paper 92 is pressed downward so as to come into contact with 95 and 96. Further, one conveying roller 95 is connected to a driven side portion of a first clutch 98 as shown in FIG. 7 via a gear (not shown).

A cover 100 is attached to the front side of the apparatus (the right side in FIG. 1) so as to be openable and closable. With the cover 100 opened (the state shown by the two-dot chain line in FIG. 1), the internal roll paper 92 can be manually set. It has become.

Above the roll paper 92, a pressing roller (only shown in FIG. 3) 102, a pair of feed rollers 103 and 104, a pair of cutters 105 and 106, and a pair of discharge rollers 108 and 109 are provided in order from the side close to the roll paper 92. A discharge port 110 for the roll paper 92 is provided above it.

One of the feed rollers 103 and 104 is connected to a driven side portion of a second clutch 114 as shown in FIG. 2 via gears 111 and 112. The other feed roller 104 is rotatably attached to the rotating bracket 118 via a leaf spring 116, and is normally pressed against the feed roller 103 by the urging force of the leaf spring 116. The pressure contact can be released by rotating the rotating bracket 118 in the direction of arrow B in FIG.

One of the cutters 105 has a shape in which a part of a circle is cut out in a straight line, and is connected to a cutter solenoid 120 shown in FIG. 2, and the cutter solenoid 120 is rotated by being switched from off to on. It is supposed to be. The other cutter 106 is provided at a position on the opposite side of the cutter 105 with the drawn roll paper 92 interposed therebetween.During rotation of the cutter 105, an intersection line of a plane and a cylindrical surface that constitutes the outer peripheral surface thereof is formed. The roll paper 92 is cut when a certain edge and the edge of the other cutter 106 rub against each other.

The pair of discharge rollers 108 and 109 are in pressure contact with each other,
One of the discharge rollers 108 is connected to the feed roller 103 via a gear train (not shown), and is driven in conjunction with the feed roller 103.

The roll paper cutting device 12 has a built-in main motor 122 that is a driving source of each roller described above, and the main motor 122 is connected to a motor control board 123 (FIG. 2 described later). The driving shaft of the main motor 122 has a driving roller 1
24 is fixed, and a belt 126 is hung on the driving roller 124 and each driving side portion of the first clutch 98 and the second clutch 114.

Accordingly, when the first clutch 98 is switched from off to on, the transport roller 95 is switched from the idling state to the driving state, and the rotational force of the driving roller 124 is reduced.
5, the second clutch 114 is switched from OFF to ON, so that the feed roller 103 is switched from the idling state to the driving state, and the rotational force of the driving roller 124 is transmitted to the feed roller 103. Has become. Further, in this embodiment, each gear ratio is set such that the driving rotation speed of the feed roller 103 is twice the driving rotation speed of the transport roller 95.

In FIG. 1, 128 and 129 are tension rollers of the belt 126.

An operation unit 130 as shown in FIG. 2 is provided at a proper place on the outer surface of the roll paper cutting device 12. This operation unit 1
Numeral 30 denotes a numeric keypad 132, a stop / clear key 134, a start key 136, a size designation key for inputting a roll paper cutting size, and a roll paper cutting device 12 shown in FIG.
A movement start key or the like for starting the movement is provided. Then, by using the ten-key pad 132 of the operation unit 130, it is possible to set and input a desired roll paper cut size and roll paper transport speed to the control device 90 as described later.

Further, in the apparatus, a first switch 138 is provided at a position where it comes into contact with the cover 100 when the cover 100 is closed, and the first switch 138 is provided at a position upstream of the cutters 105, 106 and downstream of the discharge rollers 108, 109. A second switch 139 and a third switch 140, which are turned on / off by the roll paper 92 passing through the respective positions, are provided at the positions. Further, the pulse plates 97 and 142 are fixed to the shafts to which the conveying roller 95 and the feed roller 103 are fixed, respectively, and an optical sensor having a light emitting element and a light receiving element is provided at positions corresponding to the slits of the pulse plates 97 and 142. Rotation detectors 143 and 144 (Fig. 2) are provided respectively, and the detection signals of the rotation detectors 143 and 144 and the respective switches 138 to 140 are supplied to a control device 90 incorporated in the device as shown in Fig. 2. It is supposed to be entered.

The control device 90 includes a CPU 146, a ROM 148, and a RAM 150, and mainly performs the following control operations.

(A) In the operation unit 130, based on the signal of the transport speed input by the ten-key pad 132, the data regarding the transport speed is written in the RAM 150, and the motor clock signal corresponding to the data is output to the motor control board 123. The rotation speed of the main motor 122 is controlled. Specifically, the control of the motor rotation speed is executed by changing the frequency or the duty ratio of the motor clock signal.

(B) As the movement start key of the operation unit 130 is turned on, the drive motor 82 is operated, and after the drive motor 82 is operated, the rotation amount detector 88 for detecting the rotation speed detects a predetermined number of pulses. The drive motor 82 is stopped when is detected. The predetermined number of pulses is set to the number of pulses corresponding to the distance from the upper limit position to the lower limit position of the roll paper cutting device 12.

(C) Based on detection signals from the first switch 138, the third switch 140, and the rotation detectors 143 and 144, a motor on / off signal and a motor clock signal are output to the motor control board 123 at a predetermined timing, and each clutch 9
8, 114 and the cutter solenoid 120 are switched on and off. The above timing will be described later in detail based on the flowcharts of FIGS. 5 and 6.

(D) When the second switch 139 is turned on, the display lamp 152 provided near the operation unit 130 is turned on.

Next, the control operation actually performed by the control device 90 and the paper feeding operation of the device based on the control operation will be described with reference to the flowcharts of FIGS. 5 and 6. In addition,
FIG. 5 shows the feeding operation of the roll paper 92,
FIG. 6 shows a preparation operation (corresponding to step S ₁ in FIG. 5) before starting the feeding operation.

First, in the copying machine body 10, the paper feed mode is switched to a manual feed mode, that is, a mode in which transfer paper is supplied from the transfer paper insertion port. Regarding the roll paper cutting device 12, when the roll paper cutting device 12 is at the upper limit position, that is, when the discharge port 110 of the roll paper cutting device 12 is at the position matching the transfer paper insertion port 28, it is left as it is, and the lower limit is set. In the case of the position, the movement start key of the operation unit 130 is turned on and the drive motor 82 moves the entire roll paper cutting device 12 to the upper limit position.

After that, the operation unit 130 in the roll paper cutting device 12
By operating the ten-key pad 132, the data regarding the roll paper transport speed is input to the control device 90. This data may be input at a speed equal to the transfer paper transport speed in the copying machine main body 10.

In this state, the paper feed preparation operation shown in FIG. 6 is started. First, open the cover 100 of the roll paper cutting device 12, and rotate the bracket 1
18 is rotated in the direction of arrow B in FIG.
The pressure contact between the rollers 3,104 is released, and the leading end of the transfer paper 92 wound around the roll shaft 93 is fixed to the feed rollers 103,104.
Manually inserted between (Step SS _1). Then, reaching the tip to a second switch 139, when switching the same switch 139 is turned on (YES at Step SS _2), indicator lamp 152 of the roll paper cutting device 12 is turned on (Step SS _3). At this point, the operator stops the setting operation of the roll paper 92, returns the rotating bracket 118, and presses the feed rollers 103 and 104 again against each other.

After that, by closing the cover 100 (step S
S ₄ ) and the first switch 138 is turned on (step S
If YES in S ₅ , the detection signal is input to the control device 90.
At this point, the control device 92 outputs a control signal to the motor control board 123 to drive the main motor 122 in the forward direction, that is, to drive the driving roller 124 in the clockwise direction in FIG. SS ₆ ), and further, the second clutch 114 is switched from off to on (step SS ₇ ).
As a result, the feed roller 103 and the discharge roller 108 are rotationally driven in the counterclockwise direction in FIG. 1, and the roll paper 92 is pulled out in the discharge direction. The main motor at this time
The drive of 122 is performed at a transport speed slower than the speed input by the ten keys 132.

Thereafter, the roll paper 92 passes through the discharge roller pair 108 and 109, when it reaches the third switch 140 switches to turn on the switch 140 (YES in step SS _8), the detection signal is input to the control device 90, The device 90 switches the second clutch 118 from on to off (step SS ₉ ). As a result, the conveyance of the roll paper 92 is stopped.

Then, the control device 90, reverse rotation of the main motor 122, i.e. the driving roller 124 is driven in the direction of rotation in the reverse direction (step SS _10), further the first clutch 98
To switch from off to on (step SS ₁₁ ). As a result, the transport roller 95 rotates in the clockwise direction in FIG. 1, and the roll paper 92 is pulled back downward.

At this time, the pulse plate 97 that rotates integrally with the transport roller 95
Then, the rotation detector 143 inputs information about the rotation of the transport roller 97 to the control device 90 as a pulse signal. At the time when the number of pulses of this pulse signal reaches the preset number of pulses M ₀ (step SS ₁₂
YES), switch off the first clutch 98 (step S
S ₁₃ ), and then the main motor 122 is turned off (step SS ₁₄ ). The number of pulses M ₀ is set to the number of pulses corresponding to the distance from the detection position of the third switch 140 to the cutting position by the cutters 105 and 106. Therefore, by the operation of the above steps SS _{10 to} SS ₁₄ , The leading edge of the paper 92 will stop accurately at the cutting position by the cutters 105 and 106.

Then, the ten key 132 of the operation unit 130, by the number of pulses M that corresponds to the desired roll paper cutting dimension size is set input (step S _15), paper feed preparation operation is completed.

The subsequent sheet feeding operation is as shown in the flowchart of FIG.

That is, by operating the start key 136 of the operation unit 130 (step S ₂ ), a signal is output from the control device 90 to the motor control board 123, and the main motor 122 corresponds to a high speed, that is, the speed input by the ten key 132. It is rotated forward at a speed (step S _3).

In this state, the second clutch 114 is switched on first (step S _4), the feed roller 103 is rotated in the counterclockwise direction of FIG. 1, the copying unit 14 the rolled paper 92 from the discharge port 110 The transfer paper is unloaded toward the transfer paper insertion port 28.

Then, when the pulse number of the detection signal by the rotation detector 144 reaches the predetermined pulse number M ₁ (YES in step S ₅ ),
The second clutch 114 is switched off (Step S _6),
The conveyance of the roll paper 92 is stopped. By the operation up to this step S ₄ to S _6, the roll paper 92 is transported to a position where its leading edge reaches the paper feed roller pair 22 of the copying unit 14.

Next, (step when the first clutch 98 is switched on (step S ₇₎ conveying rollers 95 by the rotationally driven, the number of pulses of the detection signal of the rotation detector 143 has reached the predetermined number of pulses M ₂ in S ₈ YES) the first clutch 98 is switched off (step S _9), the rotation of the conveying roller 95 is stopped. The operation in steps S ₇ to S _9, is performed rotation of only the conveying roller 95, the feed roller 103,10
Deflection is formed at the front side of 4. At this time, all the rollers are in the idling state, and are ready to start feeding in the copying machine body 10.

Thereafter, when the paper feed roller 22 is operated in the copying machine body 10 and the paper feeding operation of the roll paper 92 is started, the roll paper cutting device 12 is started.
The inside roll paper 92 is pulled upward, and the feed roller 103 that comes into contact with the roll paper 92 rotates.

When this rotation is detected by the rotation detector 144 (step S
YES _10), the controller 90 switches on the first clutch 98 (step S _11), to drive rotation of the conveying roller 95, the number of pulses of the detection signal of the rotation detector 143 reaches a predetermined number of pulses M ₃ at the time of the (in step S ₁₂ YES), switch off the first clutch 98. Here, the number of pulses M ₃ is
The number of pulses (M-m) is obtained by subtracting a fixed number of pulses m from a number of pulses M corresponding to the size of the roll paper 92 set by the operation unit 130. Therefore, by the operation of the steps S ₁₁ to S _13, corresponding to the number of pulses M ₃ at a speed roll paper 92 is equal to the sheet feeding speed of the copying machine main body 10 (= M-m) a roll paper cutting device within 12 Is transported the same distance.

Following this, the controller 90 switches the second clutch 114 ON (step S _14), together with the rotationally driven feed roller 103, the number of pulses of the detection signal of the rotation detector 144 reaches a predetermined number of pulses M ₄ when the (YE in step S ₁₅
S), the second clutch 114 is turned off (step
S _16). Here, the number of pulses M ₄ is set to the number of pulses m, therefore, by the operation of the steps S ₁₄ to S _16, the sheet paper roll 92 in the copying machine 10 with roll paper cutting device within 12 The number of pulses M ₄ (= m) at twice the paper speed
Is transported by a distance corresponding to As a result, the roll paper 92 is extraly carried out by a distance corresponding to the number of pulses m / 2 by subtracting, and a bend is formed in a portion in front of the cutters 105 and 106 for setting the timing of the cutting.

Thereafter, the cutter solenoid 120 is switched on a predetermined time (step S _17), cut the roll paper 92 cutter 105 is rotated 1, the rear end of the shredded paper roll 92 is a third
Through the switch 140 when the switch 140 is switched from on to off (step S _18), the main motor 122
There is switched off (step S _19), the sheet feeding operation is finished.

As described above, this roll paper cutting device 12
After 92 is set, the roll paper 92 is temporarily cut by the cutter 105,
The paper is conveyed to the downstream side of 106, and when the leading edge reaches the position detected by the third switch 140, the sheet is fed backward by the set pulse number M _0. Therefore, the leading edge of the roll paper 92 is always in the cutting position. Can be accurately aligned. Also,
At the time of the above-mentioned reverse feeding, since the bending formed between the roll portion of the roll paper 92 and the feed rollers 103 and 104 is removed, there is also an effect that the load on the drive system at the start of paper feeding is reduced.

Note that the present invention is not limited to such an embodiment, and the following embodiments can be taken as examples.

(1) In the above embodiment, the roll paper cutting device 12 is mounted so as to be able to move up and down with respect to the copying machine main body 10. However, in the present invention, it is used separately from the copying machine main body 10 and cutting is performed beforehand by this device. The rolled paper may be used for the copying machine main body 10. Needless to say, the application of the cut roll paper is not limited to copying.

(2) In the above embodiment, the tip of the roll paper 92 is cut by the cutter 10.
Although it is positioned at the cutting position by 5,106, in the present invention, it may be appropriately set regardless of the above position. However, if the roll paper is positioned at the cutting position, it is possible to cut the roll paper to the same size from the first sheet with the same control.
The control content of is simplified.

(3) In the above embodiment, the third switch, which is the roll paper detecting means of the present invention, is provided on the downstream side of the discharge rollers 108, 109. However, if the roll paper detecting means is on the downstream side of the cutting position by the cutter, Well, for example, in the above embodiment, it may be provided at a position between the cutters 105 and 106 and the discharge rollers 108 and 109.

(4) In the above embodiment, the roll paper 92 is positioned based on the rotation amount of the feed roller 103. However, for example, the conveyance may be stopped after a predetermined time has elapsed after the third switch 140 was turned on. Even if various controls are performed, the same effect can be obtained.

〔The invention's effect〕

As described above, the present invention conveys the set roll paper once in the discharge direction, and when the leading edge of the roll paper is detected by the roll paper detection means, the roll paper is moved in the direction opposite to the discharge direction by a preset amount. Since the roll paper is conveyed, the roll paper can be cut from the first sheet with accurate dimensions by accurately positioning the leading end position of the roll paper. There is an effect that it can be suitably used from paper. Further, during the above-mentioned reverse feeding, there is an effect that the bending between the leading end of the roll paper and the roll portion of the roll paper is eliminated, thereby reducing the load on the drive means.

[Brief description of the drawings]

FIG. 1 is an internal structure diagram of a roll paper cutting device according to an embodiment of the present invention, FIG. 2 is a block diagram showing an input / output relationship of a control device provided in the roll paper cutting device, and FIG. 3 is the roll. FIG. 4 is an overall configuration diagram of an image forming apparatus equipped with a paper cutting device, FIG. 4 is an internal structural diagram of a copying section in the image forming device, and FIGS. 5 and 6 are control operations by a control device of the roll paper cutting device. It is a flowchart showing. 12: Roll paper cutting device, 90: Control device (control means), 92: Roll paper, 95: Conveying roller (conveying means), 103: Feed roller (conveying means), 122: Main motor ( Drive means), 140 ... Third switch (roll paper detection means).

Claims (1)

(57) [Claims] 1. A roll paper feed means for feeding a built-in roll paper, a drive means for driving this transport means, and a cutter for cutting the roll paper being fed in the middle, and the roll paper is cut and discharged. In the roll paper cutting device configured as described above, a roll paper detection unit that is provided on the downstream side of the cutting position by the cutter and that detects the leading end of the roll paper, conveys the roll paper in the discharge direction, and And a control means for controlling the drive of the carrying means so that when the leading edge of the paper is detected by the roll paper detecting means, the roll paper is carried by a preset amount in a direction opposite to the discharging direction. Roll paper cutting device.