JPH0717300B2 - Roll paper feeder - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a roll paper feeder that cuts roll paper into a predetermined length with a cutter and feeds the cut paper.

(Prior Art) FIG. 1 is a schematic view of a roll paper feeding device of this type. Reference numeral 3 is a roll paper, and 4 and 6 are first and second paper feed rollers that convey the paper unwound from the roll paper. Reference numeral 5 is a cutter for cutting the paper at a predetermined timing.

As shown in FIG. 2, the cutter 5 brings the rotary blade 1 and the fixed blade 2 into contact with each other, and cuts the sheet from one end to one end in a predetermined time. Therefore, install the cutter at right angles to the transport direction,
When the paper being conveyed is cut, the paper is cut obliquely (hereinafter referred to as oblique cutting) as shown in FIG. In order to prevent this, the cutter 5 is previously attached obliquely by the amount indicated by n in the figure. In the figure (a), l is the sheet cutting line, W is the sheet width, and in the figure (b),
P indicates a sheet standby position.

In such a paper feeding device, conventionally, the following method is usually used when newly setting a roll paper.

The leading edge of the roll paper 3 is gripped by the first paper feed roller.

A knob (not shown) provided on the first paper feed roller shaft is manually turned to guide the leading edge of the paper to the cutter 5 and thereafter.

A knob (not shown) provided on the cutter shaft is manually turned to cut the paper.

Remove the cut pieces of paper.

In this case, since the stopped paper is cut by the cutter 5 installed diagonally, the paper was cut diagonally by the amount shown in FIG. 2 (a) n.

That is, in the conventional roll paper feeding device, when a new roll paper is set, a deformed paper is created for the first roll paper.

Further, in the conventional apparatus, during the paper feeding operation, the first and second paper feeding rollers 4, 6
The sheet conveyed by is cut to an arbitrary length and is conveyed to the photosensitive drum 24 through the third sheet feeding roller 23. In this case, since the first paper feed roller 4 starts decelerating and stops after cutting, the leading end of the roll paper is fixed blade 2 as shown in FIG. 2 (b).
Overrun and wait.

On the other hand, when the roll paper is manually cut at the time of setting, the paper does not move, so the standby position at the leading end is the position of the fixed blade 2 in FIG.

Therefore, in the paper feeding device in which the position or cut length of the image transferred to the paper is influenced by the start timing of the first paper feeding roller 4, the set position of the roll paper is different due to the difference in the standby position of the leading end of the roll paper. There is a drawback that the image position and the cutting length differ between the time and the paper feeding operation.

(Purpose) The present invention solves the drawbacks of the conventional example as described above, and there is no difference in the cutting length between when the roll paper is set or when the paper is jammed and when the paper is fed, and the paper is cut. An object of the present invention is to provide a roll paper feeding device capable of preventing the paper from being obliquely cut.

(Structure) Hereinafter, the present invention will be described based on illustrated embodiments.

3A and 3B show a drive system of a sheet feeding device according to an embodiment of the present invention. FIG. 3A is a plan view and FIG. 3B is a side view.

An embodiment of the present invention will be shown below. Since the structure is such that a mechanism is newly added to the sheet feeding device shown in the prior art, the above description will be omitted.

A knob 8 for manually rotating this roller, a motor 22 and a gear sprocket 10 for driving the same are provided on the first paper feed roller 4 shaft, and the gear sprocket 10 and the second paper feed roller 6 shaft are provided. The sprocket 13 installed in the
Drive is transmitted by 14. Further, the gear sprocket 10 is configured to mesh with the toothless gear 12 via an idle gear 11.

A gear shaft 17 is fixed to one side shaft of the tooth-chipped gear 12, and a knob 9 for manually rotating the rotary blade 1 is provided at the tip thereof.
The toothless gear 12 is slidably supported by a cutter shaft in its axial direction, and its rotation is configured to interlock with the rotary blade 1 by a key 18.

A spring 19 is provided between the toothless gear 12 and the cutter 5, so that the toothless gear 12 does not mesh with the idle gear 11.
In other words, it constantly applies the force to slide it to the stage where it does not mesh.

The tooth-chipped gear 12 has a notch on its outer periphery as shown in FIG. 3 (b), and a stopper 15 is meshed with this. The stopper 15 is provided with a solenoid 16 and a spring 20, by which the stopper 15 slides so as to be able to mesh with the cutout portion.

Here, the gear ratios of the toothless gear 12 and the gear sprocket 10 described above are set as follows.

The number of rotations of the first and second paper feed roller shafts 4 and 6 during the paper feed operation is N
₁ (assuming that both paper feed rollers have the same diameter), the number of rotations of the cutter during the paper feed operation is N ₃ , the number of teeth of the sprocket of the gear sprocket 10 provided on the first feed roller 4 axis, and the second paper feed The number of teeth of the sprocket 13 provided on the roller 6 axis is T ₁ , the number of teeth of the gear of the gear sprocket 10 provided on the first paper feed roller 4 axis is
Z ₁ and the number of teeth of the tooth-missing gear connected to the cutter shaft is Z ₂ (this number includes the number of missing teeth) Z ₂ / Z ₁ · T ₁ / T ₁ = Z It is set so that ₂ / Z ₁ = N ₁ / N ₃ ...

In the formula, when the tooth-chipped gear 12 is manually rotated through the idle gear 11 so as to mesh with the gear sprocket 10, the rotation ratio between the second paper feed roller 6 and the cutter 5 is The rotation of the cutter 5 is transmitted to the second paper feed roller 6 so that the rotation ratio becomes equal to N ₁ : N ₃ .

The operation will be described below.

(1) Operation during roll paper setting The cutter 5 is on standby at the position shown in FIG. 2 (b) except when cutting. At this time, as shown in FIG. 3, the tooth-chipped gear 12 corresponds to the idle gear 11 with the tooth-chipped portion, and the cutout portion with the stopper 15 to cut the cutter 5 in the cutting direction.
Has prevented the rotation.

In this state, the first and second paper feed rollers 4 and 6 are manually rotated to guide the leading end of the roll paper to the rear of the second paper feed roller, as described in the section of the prior art. After that, the knob 9 is grasped and pushed into the cutter side. As a result, the tooth-chipped gear 12 slides in the direction in which the spring 19 is compressed, and the stopper 15 is disengaged from the cutout portion of the tooth-chipped gear 12, enabling rotation in the cutting direction.

After this, the knob 9 is rotated to rotate the tooth-chipped gear 12 and the cutter 5, but immediately before the cutting by the cutter is started, the tooth-chipped gear 12 and the idle gear 11 are engaged with each other, and the gear sprocket 10 and the sprocket 13 are used. First and second paper feed rollers 4,
Rotate 6 with the above settings. At this time, idle gear 11
The tooth profile of the idle gear 11 has a positive displacement in advance so that the toothless gear 12 and the toothless gear 12 mesh smoothly with each other, and the tooth tips of the gear are sharpened. After this, when cutting is completed, the toothless portion is again made to correspond to the idle gear 11, and the cutter 5 is rotated so as not to transmit the rotation to both rollers. After that, by stopping both rollers, the leading edge of the roll paper stands by at a predetermined position shown in FIG. 2 (b). When the cutter 5 completes one rotation and returns to the original position, the notched gear 12 comes to the position of the tip of the stopper 15 as shown in FIG. Slide by the pressure of the spring 19,
Return to the original position.

This state is a state in which the rotation of the cutter 5 and the tooth-chipped gear 12 in the cutting direction is blocked as described above. This prevents overrun of the cutter 5 during manual cutting, and the positioning of the cutter is performed. There is. The cut pieces of paper can be taken out from between the second paper feed roller 6 and the third paper feed roller 23 (not shown).

(2) Operation during paper feeding Immediately before the start of paper feeding after the roll paper has been set, the solenoid 16 is turned on to move the stopper 15 to the position shown by the dashed line in FIG. As a result, the member for preventing the rotation of the cutter 5 is eliminated.

After that, the first and second paper feed rollers 4 and 6 are rotated by the motor 22 in the same manner as in the conventional technique, and the conveyed paper is cut into an arbitrary length. After the cutting is completed, the first paper feeding roller 4
When the motor 22 is turned off, it stops at a predetermined timing.

25 is a brake that controls the roller. The stop timing of the first paper feed roller 4 is set so that the position of the leading end of the roll paper at this time coincides with the position of the leading end of the roll paper after the manual cutting.

After that, the sheet cut by the third paper feed roller 23
Transported to 24. At this time, the second paper feed roller 6 has no driving force, receives the rotational force from the paper conveyed by the third paper feed roller 23, and is idling. 1 It is arranged so that it does not reach the paper feed roller 4. The solenoid 16 is turned off after the cutter 5 is actuated, and the stopper 15 is returned to the position shown in FIG. The motor 21 rotates, stops, and positions the cutter.

By the way, in the present invention, the toothless gear 12 and the gear sprocket 10 are meshed with each other via the idle gear 11 during the manual cutting, and they are not meshed during the paper feeding operation. The reason for this is shown below.

Consider a configuration in which the tooth-chipped gear 12 does not move.

For that, the state that the knob 9 of the cutter shaft is constantly pressed,
In other words, the toothless gear 12 has its teeth positioned in the same stage as the idle gear 11 and the gear sprocket 10. Consider what happens when the paper feeding operation is performed in this state. In this case, first the first and second paper feed rollers 4 and 6 rotate,
Start transportation. At this time, the gear sprocket 10 and the idle gear 11 rotate in conjunction with the first paper feed roller 4, but the tooth-chipped gear 12 does not rotate because the tooth-chipped portion corresponds to the idle gear 11. After that, the cutter 5 rotates at a predetermined timing. At this time, the toothless gear 12 also rotates in conjunction with
Eventually, the idle gear 11 and the partly tooth-chipped gear 12 try to mesh with each other, but since both cutting edges rotate at the same speed, a defective meshing occurs, and the driving of the cutter 5 and the first paper feed roller 4 interfere with each other. As a result, the first paper feed roller 4 and the cutter 5
In the former case, the conveyed sheet is temporarily decelerated, and the sheet is displaced on the photoconductor 24, causing a jitter. In the latter case, the paper is not cut straight.

In order to prevent the above problems, in the present invention, the toothless gear 12 is moved as described above so that the two drives do not interfere with each other during the paper feeding operation.

In the present invention, the first and second rollers are adjusted to have the same N ₁ : N ₃ ratio.
If 4, 6 and cutter 5 are rotated, the amount of oblique cutting does not change even if the number of rotations thereof is relatively increased or decreased, but the reason will be described below.

The diagonal cut amount of the cutter 5 is represented by the following formula.

Diagonal cut amount n = cutting time t × paper conveyance speed v The cutter 5 cuts within a predetermined rotation angle within one rotation. This is called a cutting angle. If the cutting angle is θ, the cutting time t is t = 1 / N ₃ · θ / 360 …… The paper transport speed v is v = π · D · N ₁ …… (D: 1st, 2nd Therefore, the diagonal cutting amount n is n = 1 / N ₃ · θ / 360 · π · D · N ₁ = θ / 2π · π · D · N ₁ / N
₃ = K (N ₁ / N ₃ ) ... (K: constant) From the formula, if the ratio of N ₁ : N ₃ is constant, the amount of diagonal cutting can be reduced even if the rotation speed of the roller and cutter is increased or decreased. It can be said that it will not change.

By the way, in the above description, both the first and second rollers are rotated when the leading end of the roll paper is cut, but only one of the rollers may be used. What is necessary is to convey the sheet at the above-mentioned setting at the time of cutting, and either the first roller 4 or the second roller 6 may perform the conveyance. However,
When the paper is fed into the cutter 5 only when the first roller 4 is used for cutting, the paper is caught at the cutting portion of the cutter 5, so that the paper is loosened between the cutter 5 and the first roller 4 and the cutting is linear. It may not be. Therefore, it is actually better to feed the paper by the second roller 6 or the first and second rollers 4,6.

(3) Operation of Roll Paper Jam In the above description, the present invention is used for cutting the leading end portion of the roll paper when set, but it is also used when the paper is jammed downstream of the cutter. .

When feeding a long sheet of paper, for example, if the leading edge of the paper causes a paper jam at the fixing roller, the paper has not been cut yet, so manually cut the jammed paper so that it is easy to take out. Turn and cut. In this case, the paper is cut diagonally in the conventional paper feeding device. In the present invention, even in such a case, the paper is fed with the above-mentioned setting when it is cut. This allows the paper to be cut at a right angle to the transport direction.

However, in this case, while the paper is stopped at the location where the paper jam occurs, the paper in the cutter 5 is fed, so that the paper loosens between the location where the paper jam occurs from the cutter 5. In order that this slack can be absorbed in the transport path, it is necessary to provide a mechanism such that the guide plate rotates by this slack to open the transport path.

Next, FIG. 4 shows another embodiment in which the first and second paper feed rollers 4 and 6 and the cutter 5 are rotated so as to have the same N ₁ : N ₃ ratio when the roll paper is set. . The basic operation is the same as that of the embodiment, and its configuration uses a gear in the first embodiment, but uses an arm in this embodiment. The configuration different from that of the first embodiment will be described below.

M ₁ , M ₂ , and M ₃ are motors that drive the first and second paper feed rollers 4 and 6 and the cutter 5. A _one- way clutch 37 is provided between M ₁ and the paper feed roller 4. As shown in FIG. 7B, a disk-shaped stopper 27 is provided at the end of the cutter shaft, and a part of the stopper 27 is cut out as shown. Roll 30 in this notch
Are engaged with each other, and through the arm A28, the spring C29
The pressure contact is made in the axial direction of the cutter. This is for positioning the cutter 5.

The other end of the cutter shaft has an arm B31, and by pushing the pin 36 provided on the arm C32, the arm D34
Is rotated, and the second paper feed roller 6 is rotated in synchronization with the rotation of the cutter 5 with the same setting as in the first embodiment. Arm D34
A one-way clutch 35 that transmits a rotational force only in the direction in which the roller is rotated is provided between the second paper feeding roller 6 and the second paper feeding roller 6, and by this means, in conjunction with the rotation of the second paper feeding roller 6 during the paper feeding operation. The arm D34 is designed not to rotate. Reference numeral 33 is a spring D, which constantly pulls the arm C32 toward the second paper feed roller 6 side. 37 is a one-way clutch. The reason for providing this is that when the roll paper is set, the second paper feed roller 6 rotates around in association with the rotation of the cutter 5 to feed the paper, but at this time, the first paper feed roller 4 itself does not have a rotational force. Therefore, the connection with the driving means M ₁ is released so that this roller receives the rotational force from the paper and rotates smoothly.

As described above, the gear is used in the first embodiment and the arm is used in the second embodiment to rotate the second paper feed roller in the above-described setting in association with the rotation of the cutter. The same effect can be obtained by using various transmission means such as.

FIG. 5 shows an outline of a copying machine using this roll paper feeding device. The original 102 inserted from the original insertion table 101 is
As shown by the chain line, rollers 103a, 103b, 103c, 103d, 103e
After being conveyed inside the copying machine, the document is ejected to the document tray 104. The transported original is illuminated by a lamp 105 inside the copying machine, and the reflected light from the original at that time is reflected by the first mirror 106, the in-mirror lens 107, and the third mirror 10.
8. After passing through the exposure unit composed of the fourth mirror 109, it is guided onto the drum-shaped photoconductor 110. The photoconductor 110 starts rotating counterclockwise in the figure at a predetermined timing, the surface of the photoconductor 110 is uniformly charged by the charging charger 111, and then the photoconductor 110 is exposed by the exposure unit. By this exposure, an electrostatic latent image corresponding to the image of the original 102 is formed on the photoconductor 110. The latent image thus formed is developed by the developing device 117 to become a visible image. The roll paper 1 arranged at the bottom of the copying machine is sent to the photoconductor 110 by the paper feed roller 2. Here, it is superposed on the visible image on the photoreceptor, and then the visible image is transferred onto the copy paper by the transfer operation by the transfer charger 124. The copy sheet subjected to the transfer operation is separated from the photoconductor by the separation charger 125, cut into a predetermined length by the cutter 3, and conveyed to the fixing roller by the belt on the separation tank 118. The fixed copy paper is ejected by the ejection roller 120 and ejection belts 1, 2, 12
It is discharged to the copy tray 123 through 1,122. Reference numeral 113 is a cleaning device, and 112 is a charge eliminating charger.

(Effect) As is apparent from the above description, according to the present invention configured as described above, a cutter obliquely provided with respect to the rotation axis is used, and is manually operated in a case other than the paper feeding operation. When the paper is cut, the paper is cut at a right angle with respect to the conveying direction, as in the case of the paper feeding operation, and the oblique cutting does not occur. In addition, after the paper is cut, the first roller is stopped at a predetermined timing so that the standby positions of the leading ends of the roll paper after the paper feeding operation and after cutting other than during the paper feeding operation are the same. Also, the cutting length can be made constant.

[Brief description of drawings]

FIG. 1 is a general schematic view of a roll paper feeder, FIG. 2 is a view showing a cutter, FIG. 1 (a) is a plan view, and FIG.
FIG. 3 is a side view, FIG. 3 shows a drive system of a roll sheet feeding device according to an embodiment of the present invention, (a) is a plan view of essential parts, (b) is a side view, and FIG. The figure shows a second embodiment, (a) is a schematic view of a sheet feeding device, (b) is the same,
FIG. 5 is a view showing the mechanism of the cutter portion, and FIG. 5 is a schematic view of a copying machine to which this type of roll paper feeding device is applied. 4 ... the first roller, 5 ... the cutter, 6 ... the second roller.

Claims (2)

[Claims] 1. A first roller for unrolling and transporting a sheet wound in a roll shape, and one of two cutting edges provided downstream of the first roller and abutting each other, with its axis serving as a fulcrum. By rotating the cutter, a cutter that is attached obliquely in advance to cut the conveyed paper to an arbitrary length and at a right angle to the conveyance direction, and is further provided on the downstream side of the cutter and cut. In a roll paper feeding device having a second roller for transporting a sheet, a member for manually rotating the cutter, a rotation number of the first roller during the paper feeding operation is N ₁ , and a rotation speed of the second roller is When the number of rotations is N ₂ and the number of rotations of the cutter is N ₃ , when the cutter is manually operated through the above-mentioned member to cut the paper, the rotation ratio of the first roller and the cutter is approximately N ₁ : N ₃ Or the second roller and cutter Rolling ratio is nearly N _2:
A means for transmitting the rotational force from the cutter to the first roller and the second roller to rotate the rollers so as to be N ₃ .
A roll paper feeding device comprising: 2. The stop timing of the first roller is set so that the standby position of the leading end of the roll paper is the same after the paper feeding operation and after cutting other than during the paper feeding operation. The roll paper feeder according to claim (1), characterized in that the first roller is stopped and the leading end of the roll paper is made to stand by in the cutter or downstream from the cutter.