JPH09274346A - Cutter for copying machine and the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably actuate a cutter with simple constitution irrespective of large or small of the width of roll paper by providing an oil feeding member impregnated with oil in a state where it can contact/separate so that the edge of a movable blade may come in contact with the oil feeding member when the movable blade is moved. SOLUTION: The oil feeding member 22 is provided to come in contact with or separate from the movable blade 5. The member 22 is equipped with a felt 33 impregnated with the oil and a guiding member 34 fixing the felt 33. The solenoid 40 of a moving means 23 is actuated according to a signal from the control means 24 and an L-shaped metallic fitting 39 pivotally moved centering a pivot 43. The member 22 is pivotally moved centering a shaft 35 against the action of a spring means 36 and the felt 33 comes in contact with the edge of the movable blade 5. Next, a stepping motor coupled with the rotary shaft 4 of the movable blade 5 is rotated once at lower speed than rotating speed to cut the plain roll paper according to the signal from the control means 24. Thus, the oil soaking into the felt 33 is fed to the entire edge of the movable blade 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutter such as a copying machine for cutting roll paper, and more particularly, a copying machine capable of performing stable cutting during a cutting operation of a roll paper having a plurality of long and short widths. Regarding the cutter.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, there is known an image forming apparatus 1 such as a copying machine or a printer in which a plurality of roll papers 6a and 6b having different widths are loaded. The image forming apparatus 1 includes roll papers 6a and 6b having long and short widths, and one of the roll papers 6a and 6b is selected as a transfer material for forming a copy image to have an arbitrary length. A cutter 2 for cutting is provided. For example cutter 2
Is a rotary cutter that has a fixed blade 3 and a movable blade 5 that are arranged opposite to each other with a paper path in between, and the movable blade 5 rotates only in one direction. The fixed blade extends in the width direction of the roll paper 6a. It is composed of a blade 3 and a movable blade 5 provided so as to project in the outer diameter direction of the rotatable shaft 4 which is rotatable in a position substantially parallel to the fixed blade 3. The roll paper 6a is pulled out to a predetermined length by the paper feed roller 8 and is passed between the fixed blade 3 and the movable blade 5, and the detection sensor 9 measures the amount of movement of the paper feed roller 8 to obtain a predetermined length. It detects that it has reached. Based on this signal, the rotary shaft 4 is rotated to move the movable blade 5 so as to contact the fixed blade 3 to cut the roll paper 6a. An image is formed on the cut roll paper 6a by a known method as a transfer material.

As an image forming method, for example, a corona charger 11 for uniformly charging the surface of the image carrier 10 centering on the image carrier 10, and a document image projected on the image carrier 10 to be electrostatically charged. An optical projection device 12 that forms a latent image, a developing device 13 that develops this latent image as a toner image, a transfer device 14 that transfers the toner image to a transfer material, and a residual developer after transfer onto the surface of the image carrier 10. A cleaning device 15 for removing the toner, and an eraser lamp 16 for making the surface potential of the surface of the image carrier 10 uniform, which sequentially act on the image carrier 10 and the toner not yet fixed on the transfer material. Image formation is performed so as to carry an image. Next, the transfer material carrying the unfixed toner image is conveyed by a conveying means 7 such as a conveying belt.
The toner image on the transfer material is fixed as a permanent image by being guided by a fixing device 17 having a heating roller 18 and a pressure roller 19 having a heater built therein, and is discharged to the outside of the device.

[0004]

However, in the above-mentioned cutter, when a roll paper having a short width is selected and an image is formed, the movable blade and the fixed blade move so as to come into contact with each other without the roll paper. Part arises. A so-called empty cutting state occurs. If continuous copying is performed in this state and the cutter is continuously operated, the movable blade and the fixed blade are contacted with each other to scrape the edges of these blades to generate abrasion powder. If the abrasion powder adheres to the blade edges of the fixed blade or the movable blade, the abrasion powder adheres to these blade edges during the next operation of the cutter, resulting in a burning state. When the cutter in the baked state is operated, a load is generated between the fixed blade and the movable blade, and the idle cutting torque increases. Therefore, vibration is generated during the operation of the cutter, and this vibration is transmitted to, for example, the image carrier and the optical system, and adversely affects image formation. In particular, when a stepping motor is used as a drive source for the cutter, the stepping motor has a small torque and cannot rotate so that the roll paper is not cut.

On the other hand, in Japanese Utility Model Laid-Open No. 62-1899, there is known a sheet cutting device of a label printer which applies oil to the blade edge of a movable blade. This type of cutter device has a structure in which a fixed blade is positioned and a sponge-like liquid retaining material impregnated with an anti-adhesion liquid such as oil is provided within the rotation range of the movable blade. Is to constantly contact the liquid retaining member and apply the oil to the movable blade.

When a cutter having a structure in which oil is constantly applied to the movable blade is used in the above-mentioned copying machine or the like,
Even if a roll paper having a short width is selected and a part of the cutter is cut to an empty state, oil is present between the fixed blade and the movable blade, so that abrasion and baking of the blades are prevented. In addition, at the place where the roll paper passes and is cut for each image formation, even if the oil adheres to the roll paper, the amount is small, so that there is no problem in forming the image.

However, if the oil is constantly in contact with the movable blades and the cutter remains in the dry state, a large amount of oil will be accumulated in some of the movable blades. After that, if an image is formed with a wide roll paper and the roll paper is cut with a cutter, a large amount of oil adheres to the roll paper, and in the process of forming an image, for example, oil adheres to the image carrier or the developing device. As a result, the image formation is adversely affected, and much labor is required for maintenance for normalizing the apparatus main body.

The present invention has been made in view of the above-mentioned problems, and has a simple structure, such as a copying machine or the like, in which a cutter can stably operate even with roll paper of either long or short width. The challenge is to provide a cutter.

[0009]

In order to solve the above-mentioned problems, the present invention has a fixed blade and a movable blade that moves so as to come into contact with the fixed blade, and cuts roll paper having a plurality of long and short widths. In a cutter such as a copying machine, an oil supply member impregnated with oil is provided so as to be able to come into contact with and separate from the movable blade so that the blade edge of the movable blade comes into contact with the movable blade when the movable blade moves.

Further, the movable blade is a rotary cutter which rotates only in one direction, and the oil supply member is brought into contact with the movable blade only when the main power source is input and the heater of the fixing device is at a low temperature. It is characterized in that the movable blade is rotated at least once, and the rotational speed of the movable blade that rotates in contact with the oil supply member is lower than the rotational speed of the movable blade when the roll paper is cut. .

Further, in a cutter such as a copying machine having a fixed blade and a movable blade which moves so as to come into contact with the fixed blade and which cuts roll paper having a plurality of long and short widths, an oil supply member impregnated with oil is used. And a moving means for contacting or retracting the refueling member with the blade edge of the movable blade when the movable blade moves, and a control means for controlling the movement of the refueling member by the moving means. A control signal is output only when the power of the fixing device is low and the heater of the fixing device is at a low temperature. The driving means causes the refueling member to contact the movable blade and the moving speed of the movable blade is set to It is characterized in that the speed is controlled so as to be lower than the moving speed at the time of cutting.

[0012]

In this structure, the main power source of the copying machine is first turned on before image formation. At this time, only when the temperature of the heating roller in the fixing device is equal to or lower than the set temperature, the oil supply member moves toward the position in contact with the movable blade. Next, the movable blade makes one rotation at a rotational speed lower than the rotational speed for cutting the roll paper, removes foreign matter such as paper powder attached to the fixed blade, and a small amount of oil adheres to the movable blade. After that, image formation is performed by a known method,
Generation of abrasion powder and baking due to contact between the movable blade and the fixed blade are prevented.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described with reference to the drawings. 1 shows a front view of the cutter as seen from the direction of arrow A in FIG. 4, and FIG. 2 shows a cross-sectional view taken along line I-I of FIG. FIG. 3 is a refueling member 2 described later in FIG.
2 is a cross-sectional view showing a state in which 2 is in contact with the movable blade 5. FIG.
The cutter 2 is unitized and is rotatably provided around a fixed blade 3 extending in the width direction of the roll paper 6 fixedly arranged in the casing 20 thereof and a shaft 21 substantially parallel to the fixed blade 3. The rotary shaft 4, the movable blade 5 provided in the longitudinal direction of the rotary shaft 4 so as to project in the outer radial direction, the oil supply member 22 provided so as to be able to come into contact with and separate from the movable blade 5, and the oil supply member. It has moving means 23 for bringing 22 into contact with the blade edge of the movable blade 5, and control means 24 for controlling the movement of the oil supply member 22 by the moving means 23.

The fixed blade 3 is fixed to the holding member 25 by a method such as press fitting, and a shaft 26 provided on the holding member 25.
Is rotatably fixed to the side plate 27 of the casing 20 with a screw or the like. The fixed blade 3 is urged in the direction of the movable blade 5 by the coil spring 28 in order to move the fixed blade 3 so as to come into contact with the movable blade 5 described later in the width direction.
The movable blade 5 is provided so as to project in the outer diameter direction of the rotary shaft 4 by press fitting or integral molding. A shaft 21 is provided at the center of the rotary shaft 4, and a drive source such as a stepping motor (not shown) is connected to the shaft 21. The roll paper 6 is moved and cut so that the movable blade 5 continuously contacts the fixed blade 3 from the end portion 29 toward the other end portion 30 according to the rotation of the rotating shaft 4.

Guide rings 31 for guiding the fixed blade 3 are provided at both ends of the rotary shaft 4, and the fixed blade 3 is prevented from approaching the rotary shaft 4 more than necessary in order to rotate the rotary shaft 4 smoothly. ing. Reference numeral 32 shown in FIG. 2 is a guide plate 32 for guiding the roll paper, and is fixedly arranged on the side plate 27 and the like.

As shown in FIG. 2, the oil supply member 22 has a felt 33 impregnated with oil and a guide member 34 for fixing the felt 33. In order to extend the felt 33 along the longitudinal direction of the cutter and allow the felt 33 to come into contact with and separate from the movable blade 5, shafts 35 projecting outward are provided at both ends of the guide member 34. Has been. The guide member 34 is pivotable by allowing the shaft 35 to pass through a bearing or the like provided on the side plate 27. Further, the guide member 34 is provided with spring means 36 such as a coil spring, and the other end 37 of the spring means 36 is fixed to the casing 20 or the like to urge the guide member 34 away from the movable blade 5. There is. In addition, it is preferable that the amount of oil impregnated is such that the oil is slightly wet when pressed with a finger.

As shown in FIG. 2, the moving means 23 has an L-shaped L metal fitting 39 pivotally provided on the side plate 27 and a solenoid 40. There is a hole 3 in the center of the L metal fitting 39.
8 is provided to pivotally support the pivot 43 provided on the side plate 27 to pivot the L fitting 39. One end 41 of the L fitting 39 is in contact with the guide member 34 described above, and the other end 42 is connected to the shaft of the solenoid 40.
Further, in order to move the guide member 34 uniformly about the pivot axis, the other end side of the guide member 34 is also moved simultaneously with the pivotal movement of the L fitting 39. The L metal fitting 39 is pivoted by the solenoid 40 that operates based on a signal from the control means 24, which will be described later, to move the oil supply member 22 against the action of the spring means 36 provided on the guide member 34.

The control means 24 operates the solenoid 40 when the set condition is satisfied, and the refueling member 22 is operated.
Is brought into contact with the blade edge of the movable blade 5. For example, when the main switch of the apparatus main body is turned on and the condition that the temperature sensor (not shown) provided on the heating roller 18 of the fixing device 17 is below the set temperature, the solenoid 40 is turned on. It operates. A preferable example of the set temperature sensor is in the range of 40 ° C to 50 ° C. Further, the control means 24 switches the rotation speed of the stepping motor as a drive source connected to the movable blade 5 to the low speed rotation (1/100 of the normal rotation speed), and the movable blade 5 is rotated.
At least one revolution. The refueling member 22 is moved under such conditions, that is, the movable blade is refueled once a day.

The operation of this structure will be described. Turn on the main switch of the copier and heat roller 1
When the temperature sensor (not shown) provided in FIG. 8 satisfies the condition that the temperature is equal to or lower than the set temperature, the solenoid 4 of the moving means 22 is generated by a signal from the control means 24 as shown in FIG.
0 activates. Operation of the solenoid 40 causes L fitting 39
Pivots around the pivot 43 in the direction of arrow B. L metal fittings 39
The oil supply member 22 pivots around the shaft 35 against the action of the spring means 36 in association with the pivoting of the movable blade 5 and the felt 33.
Contact the cutting edge of. Then, a stepping motor (not shown) connected to the rotary shaft 4 of the movable blade 5 makes one rotation at a speed lower than the normal rotation speed for cutting the roll paper by a signal from the control means 24. In this way, the oil soaked in the felt 33 is supplied to the entire blade edge of the movable blade 5.

In the embodiment, a rotary cutter is shown as an example of the cutter. However, the guillotine type cutter in which the movable blade reciprocates with respect to the fixed blade is provided with the above-mentioned oil supply member, moving means and control means. Even if there was, the same effect was obtained. The roll paper is not limited to paper and may be film or coated paper.

Further, in the embodiment, felt is used as the oil supply member, but sponge may be used. In addition, by providing a sheet of fluorofluoroethylene (made by Sumitomo Electric Industries, Ltd.) tetrafluoroethylene resin porous material on the surface of the felt or sponge, a certain amount of oil can be exuded and the amount of oil supplied to the movable blade can be kept constant. Can be

[0022]

In the cutter of the copying machine or the like of the present invention, the oil supply member contacts the movable blade to supply oil to the blade edge when the set conditions are satisfied, so that a large amount of oil does not adhere to the blade edge. A minimum amount of the required minimum amount of oil can be applied. As a result, it is possible to prevent the fixed blade and the movable blade from being worn or burned without contaminating the inside of the apparatus main body with oil at the time of image formation, and it is possible to remove paper dust, abrasion dust, etc. attached to these blade edges. it can. Also, by switching the rotation speed of the movable blade to a low speed, oil can be reliably attached to the blade edge, and foreign matter such as paper dust and abrasion dust can be reliably removed. Further, it is possible to prevent vibration at the time of cutting due to an abnormal increase in the cutting torque due to the burning of the cutter blade, and prevent the drive motor for moving the movable blade from becoming unrotatable.

[0023]

[Brief description of drawings]

FIG. 1 is a front view showing an example of a cutter of a copying machine or the like according to the present invention.

FIG. 2 is a sectional view taken along line I-I in FIG.

FIG. 3 is a sectional view showing a state where the oil supply member in FIG. 2 is in contact with the movable blade.

FIG. 4 is a cross-sectional view showing a conventional cutter such as a copying machine provided in the image forming apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Image forming apparatus 2 Cutter 3 Fixed blade 4 Rotating shaft 5 Movable blades 6, 6a, 6b Roll paper 7 Conveying means 8 Paper feed roller 9 Detection sensor 10 Image carrier 11 Corona charger 12 Optical projection device 13 Developing device 14 Transfer device 15 Cleaning Device 16 Eraser Lamp 17 Fixing Device 18 Heating Roller 19 Pressure Roller 20 Casing 21 Shaft 22 Lubrication Member 23 Moving Means 24 Control Means 25 Holding Member 26 Shaft 27 Side Plate 28 Coil Spring 29 End 30 Other End 31 Guide Ring 32 Guide plate 33 Felt 34 Guide member 35 Shaft 36 Spring means 37 Other end 38 Hole 39 L metal fitting 40 Solenoid 41 One end 42 Other end 43 Axis

Claims (4)

[Claims] 1. A cutter, such as a copying machine, having a fixed blade and a movable blade that moves so as to come into contact with the fixed blade, and that cuts roll paper having a plurality of long and short widths, when the movable blade moves. A cutter for a copying machine or the like, characterized in that an oil supply member impregnated with oil is provided so that the blade edge of the movable blade comes into contact with the blade so that the blade tip can come into contact with the blade. 2. The movable blade is a rotary cutter that rotates only in one direction, and the refueling member is brought into contact with the movable blade only when the main power is input and the heater of the fixing device is at a low temperature. The cutter for a copying machine or the like according to claim 1, wherein the movable blade is rotated at least once. 3. The rotation speed of the movable blade, which rotates in contact with the oil supply member, is lower than the rotation speed of the movable blade when the roll paper is cut. Cutter for copying machines, etc. 4. An oil supply member impregnated with oil in a cutter of a copying machine or the like, which has a fixed blade and a movable blade which moves so as to come into contact with the fixed blade, and which cuts roll paper having a plurality of long and short widths. And a moving means for contacting or retracting the refueling member with the blade edge of the movable blade when the movable blade moves, and a control means for controlling the movement of the refueling member by the moving means. A control signal is output only when the power of the fixing device is low and the heater of the fixing device is at a low temperature. The driving means causes the refueling member to contact the movable blade and the moving speed of the movable blade is set to A cutter for a copying machine or the like, which is controlled so as to have a lower speed than the moving speed at the time of cutting.