JPS6283978A - Rolled paper feeding device - Google Patents

Abstract

PURPOSE:To enable cutting of rolled paper with an accurate size, by a method wherein, when it is given time before motion of a cutter, the speeds of first and second rollers are increased, a detouring part is formed between the second and third rollers to stop a driving means, and before the detouring part is disappeared, cutting is effected, and restarting is conducted. CONSTITUTION:When a paper from a paper 1 in roll causes turning ON of a tip detecting sensor 7 after passage through second paper feed rollers 3, a pulse counter starts to count pulses from a first driving means 9, and the paper is conveyed to a sensitizing body 6 through third rollers 4. When increased to the speed increase number of pulses, the speeds of first and second paper feed rollers 2 and 3 connected to a first driving means 9 are increased, and a detouring part is formed between the second paper feed roller and a third paper feed roller 4. When increased to the cutting number of pulses, the driving means 9 is forced into a stop, a cutter 5 is operated before the detouring part is disappeared, and the rotation of the second paper feed roller 3 is restarted. In this case, since a clutch CL is disengaged, the first paper feed roller 2 is kept from rotation, and the cut paper is waited at A. This prevents the occurrence of oblique cutting and enables provision of a paper having an accurate size.

Description

[Detailed description of the invention] (Technical field) The present invention relates to a roll paper feeding device using roll paper.

(Prior Art) FIG. 1 is a diagram showing a schematic configuration of a paper feeding section, which is the premise of the present invention, and the prior art will be explained based on this diagram.

1 is a roll paper, and 2.3.4 is a 1st part that conveys the paper unwound from the roll paper. Second. a third paper feed roller;
1st. The paper feeding speed of the second paper feeding rollers 2 and 3 is set to be slightly faster than the paper feeding speed of the third paper feeding roller 4. A cutter 5 cuts the paper at a predetermined timing.

After the paper is cut, it waits at the position shown in the figure.

The operation will be explained below. The paper unwound from the roll paper 1 usually starts to be conveyed from position A, and moves to the second position. The paper passes through the third paper feed rollers 3 and 4 and is sent to the photoreceptor 6. At this time, 1. The paper feed speed of the second paper feed roller 2゜3 is slightly faster than the paper feed speed of the third paper feed roller 4. A detour section for the paper is gradually formed in between.After this, the cutter 5 operates at a predetermined timing, but the rotary blade 9 and fixed blade 10 of the cutter 5 [Fig. 3 (a), (b), 4 The paper being conveyed at the contact point (see figure), in other words, at the cutting point, is pulled in the opposite direction to the conveyance direction. In Figure 3 (b), 10a indicates the straight line of the fixed blade edge. Also, (c) , the arrow indicates the direction of paper transport.For this reason, a slight slip occurs between the rollers after the cutter 5 and the paper, but this slip occurs after the third paper feed roller 4 and causes the paper to shift on the photoreceptor 6. In order to prevent this from occurring, a paper detour is provided between the second paper feed roller 3 and the third paper feed roller 4 using the method described above.

The problems with this type of paper feeding device are shown below.

(1) Since the paper being fed is cut by contact between the rotary blade 9 and the fixed blade 10 from one end of the paper to the other end, it takes a predetermined time to cut the paper as shown in Fig. 2 (C). is cut diagonally (hereinafter referred to as diagonal cut).

In order to prevent this, the cutter 5 is installed in advance at an angle indicated by n in the figure. However, because the cutting conditions change depending on the thickness and type of paper, the value of n is not constant.
Diagonal cuts occurred due to this variation.

(2) The rotary blade 9 and fixed blade 10 of the cutter 5 are normally on standby at a position as shown in FIG. From this state, the rotary blade 9
is rotated to cut the paper being conveyed, but if the standby position of the rotary blade 9 or the rotational state of the rotary blade 9 varies, an error will occur in the cutting length.

(3) In order to cut the paper being transported, the paper is moving in the transport direction at the contact point between the rotary blade 9 and the fixed blade 10, in other words, at the cutting point. Since this direction is different from the cutting direction of the cutter 5, the paper fibers at the cutting point move while being caught by the rotary blade 9 and the fixed blade 10. For this reason, fiber fuzz occurs at the cut portion of the paper, and paper fiber powder called paper dust is generated. If this adheres to the paper and is conveyed, problems will occur in image formation during the transfer process.

(4) As the paper is conveyed, a detour part is gradually created between the second paper feed roller 3 and the third paper feed roller 4, so when a long sheet of paper is conveyed, the detour part increases. This results in a huge amount of paper, causing the paper to meander left and right after the detour, causing wrinkles.

In order to solve the above problems, the following paper feeding device has already been proposed.

The paper unwound from the roll paper 1 usually starts to be conveyed from position A, passes through the second paper feed roller 3, and reaches the third paper feed roller 4. At this time, since the third paper feed roller 4 is not rotating, a paper detour is formed between the second paper feed roller 3 and the third paper feed roller 4. After the detour amount reaches a predetermined amount, the third paper feed roller 4 is started, and continues conveyance while maintaining the detour portion of a fixed amount of paper. After this, the first
゜The second paper feed roller 2.3 stops and the cutter 5
is activated. During this time, the detour portion decreases, but the cutting operation is completed before the detour portion is completely eliminated, and the second paper feed roller 3 is rotated again to feed the paper. The problems with this paper feeding device are shown below.

(5) The advantage of paper feeding devices that use roll paper is that even if long sheets of paper are conveyed, as long as the paper is connected to the roll paper,
It is difficult to meander from side to side. However, if a detour section is created for the paper that is not regulated by a guide plate or the like within the conveyance path, the paper will not be connected to the roll paper, so the paper will meander after the detour section. In the case of this paper feeding device, since a detour portion for the paper is formed between the second paper feeding roller 3 and the third paper feeding roller 4, the paper meanders after the third paper feeding roller 4.

(Purpose) The present invention was made based on this background, and an object of the present invention is to prevent diagonal cuts and uneven cuts when cutting paper in a paper feeder that unwinds and conveys roll paper. do.

(Structure) For this purpose, the present invention provides the first . By making the paper feed speed of the second paper feed roller faster than the paper feed speed of the third paper feed roller, a paper detour is formed between the rollers, and then the paper feed speed of the first paper feed roller is made faster than the paper feed speed of the third paper feed roller. The present invention is characterized in that the second paper feed roller is stopped, the cutting is completed before the detour portion is completely eliminated, and the second paper feed roller is started again.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIG. 1, 1. The second paper feed - roller 2.3 includes:
A motor (M+'') 9 is provided that changes the paper feeding speed in two stages and drives and stops the paper.
A clutch CL is provided between the paper feed rollers 2 to transmit and release the drive. The third paper feed roller 4 is provided with a motor (M8) 17 that drives the paper at a constant speed. A sensor 7 detects the leading edge of the sheet being conveyed.

FIG. 5 shows a control block diagram of this paper feeding device.

The drive means 9 in FIG. A pulse generator 10 that generates pulses proportional to the amount of paper fed by the second paper feed roller 2.3 is provided, and after the leading edge of the paper passes the leading edge detection sensor 7, a pulse counter 11 that counts the number of pulses generates the pulses. It is provided on the output side of the device 10. Reference numeral 12 denotes a size designation button for arbitrarily designating the cutting length S of the transfer paper, and the pulse setting device 13 sets the number of pulses P corresponding to the cutting length S, and the first driving means described later Set the speed increase start pulse number P of 9.

The number of pulses of the pulse counter 11 and the pulse setter 13 are compared by a comparator I4, and when the number of pulses of the pulse counter 11 reaches the speed increase start pulse number P, the first
When the number of pulses on the counter 11 reaches the number of cutting pulses P2, the first driving means 9 is increased in speed.
is stopped, and the cutter 5 is activated. 15 is a pulse generator that generates a pulse corresponding to the length of the document, and 16 is a delay circuit that delays the output from the comparator 14 and outputs it to the cutter 5.

Next, the operation of this paper feeding device will be explained using FIG. 1 and FIGS. 2(a) to 2(d).

The paper unwound from roll paper 1 is usually marked A in Figure 1.
Conveyance is started from a position where the paper passes through the second paper feed roller 3 and the leading edge detection sensor 7 is turned on. In response to this, the pulse counter 11 starts counting the number of pulses. Thereafter, the paper passes through the third paper feed roller 4 and is sent to the photoreceptor 6. At this time, the first, second... Third paper feed roller 2. 3. 4
The above-mentioned 1. The second drive means 9 and 17 are driven. After that, when the number of pulses of the pulse counter 11 reaches the speed increase start pulse number P1 mentioned above, the first and second paper feed rollers 2 and 3 connected to the first drive means 9 speed up, and the second paper feed A paper detour is formed between the roller 3 and the third paper feed roller 4. After this, when the number of pulses of the pulse counter 11 reaches the number of cutting pulses P2, the first
The drive means 9 is stopped and the cutter 5 is activated. During this time, the detour portion of the paper decreases, but before it is completely eliminated, the cutting operation is completed, the first driving means 9 is restarted, and the second folding roller 3 is rotated. At this time, clutch CL
is released, the first paper feed roller 2 does not rotate, and the cut paper on the roll paper side waits at position A.

Also, before the cutting operation, the first driving means 9 increases the speed to form a detour section of the paper, and the amount of the detour section is S in FIGS. 2(a) and 2(b).
The speed increase time and speed increase are set in advance so that the paper detour ff1sz (represented by I), which decreases while the first drive means 9 is stopped (FIG. 1(b)), becomes larger.

Furthermore, as shown in FIGS. 2(a), (b), and (c), the number of acceleration start pulses PI is equal to the number of cutting pulses P! This is the number of pulses obtained by subtracting the number of pulses counted during speed increase (preset) from the pulse setting device 1.
3, it is set according to the cutting length S.

The above description is based on the case where the cutting length is specified in advance using the laser selection button 12, but as shown in Figure 5, the number of pulses centered on the document length can be detected in the same way as the pulse number counting method described above. , the document length may be automatically read by converting it into the number of acceleration start pulses and the number of cutting pulses, and the paper may be cut to the corresponding length.

Further, as shown in FIGS. 1 and 6, the first driving means is increased for a certain period of time by turning on the sensor 8 that detects the last document or the cutting button 18, and then the cutting operation is performed in the same way. In addition, in FIG. 6, 19.20 is a delay circuit.

FIG. 7 shows an outline of a copying machine using this paper feeding device. A document 31 inserted from the document insertion table 30 is conveyed inside the copying machine by a roller 32, as shown by a dashed line, and then discharged onto a document tray 33. The transported document is illuminated by a lamp 34 inside the copying machine, and the reflected light from the document at that time is reflected by a first mirror 35a and an in-mirror 35b.

The light is guided onto the drum-shaped photoreceptor 6 through an exposure unit consisting of a third mirror 35C and a fourth mirror 35d. The photoreceptor 6 starts rotating counterclockwise in the figure at a predetermined timing, and after its surface is uniformly charged by the charging charger 37, it is exposed by the exposure unit. Through this exposure, an electrostatic latent image corresponding to the image of the original 31 is formed on the photoreceptor 6. The latent image thus formed is developed by the developing device 38 to become a developed image. A roll of copy paper 1 placed at the bottom of the copying machine is fed to a photoreceptor 6 by a paper feed roller 2. Here, the developed image is superimposed on the developed image on the photoreceptor, and then the developed image is transferred onto copy paper by a transfer operation by a transfer charger 39. The copy paper subjected to the transfer operation is separated from the photoreceptor by a separation charger 40, further cut into a predetermined length by a cutter 5, and conveyed by a belt on a separation tank 41 to a fixing roller. The fixed copy paper is delivered to paper ejection roller 4.
2. The paper passes through the paper ejection belts 43 and 44 and is ejected to the copy tray 45. 46 is a cleaning device, 47 is a static elimination charger, and 49 is a fixing device.

(Effects) The present invention is as described above, and according to the roll paper feeding device according to the present invention, (1) The paper is cut by temporarily stopping the paper, and the paper is fixed by the rollers before and after the cutter. Because of this, there is almost no movement of the paper during cutting (diagonal cuts are less likely to occur).

(2) Since the paper is cut while being temporarily stopped, the cutting length does not change even if the operating state of the cutter varies, and paper of an accurate size can be obtained.

(3) In order to cut paper that is stopped, conventional example (3)
As mentioned above, the paper gets caught on the edge of the cutter and is not cut. A cutter that causes poor cutting due to the defects shown in item (3) becomes capable of cutting when the cutting conditions of the present invention are applied. Therefore, by using the present invention, the durability of the cutter is improved.

(4) Since the paper detour necessary for cutting is created immediately before the cutting operation starts, the distance to be conveyed while maintaining this detour is short. Therefore, since even long objects are transported with little meandering of the paper, it is possible to prevent image positional deviation in the direction perpendicular to the transport direction during the transfer process.

It has the following effects.

[Brief explanation of drawings]

FIG. 1 is a schematic mechanical diagram of a roll paper feeding device that is the premise of the present invention, and FIGS. 2(a), (b), and (c). (d) is a timing chart showing the relationship between each part and pulse count according to the present invention, and 1. FIG. 3(a) is a diagram showing the paper feed speed amount of the second liner roller. (b) and (C) are side views of part of the cutter, respectively.
4 is a longitudinal sectional side view showing the initial position of a part of the cutter, FIG. 5 is a paper feed control block diagram according to an embodiment of the present invention, FIG. 6 is the same, FIG. 7, a paper feed control block diagram according to another embodiment, is a schematic configuration diagram of a copying machine to which the present invention is applied. 1... Roll paper, 2. 3. 4... 1st. Second.
3rd paper feed roller, 5... cutter, 9... first drive means. Ge?・Lou, work Figure 1 Figure 2 (DL cutter Figure 3 Figure 5

Claims (1)

[Claims] A paper feeding device that unwinds and conveys paper wound in a roll shape and cuts it into a required length includes a cutter that cuts the rolled paper, a first paper feeding roller disposed before and after the cutter, and a second paper feed roller, a third paper feed roller disposed downstream of the second roller, and a first drive means that variably drives the paper feed speed of the first and second paper feed rollers; a second driving means for driving a third paper feed roller;
A predetermined time before the cutter operates, the paper feed speed of the first and second paper feed rollers is made faster than the paper feed speed of the third paper feed roller, thereby creating a paper detour between the rollers. the first and second paper feeding rollers are stopped, the cutting operation is completed before the detour part is completely eliminated, and the second paper feeding roller is started again. .