JPH0450280Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a roll paper feeding device used in copying machines, printing machines, flexible printers, etc.

(Prior Art) When cutting roll paper in a roll paper feeding device such as a copying machine, a printing machine, or a facsimile machine, there are two main methods: cutting the transfer paper after it is stopped, or cutting the transfer paper while it is being conveyed.

If the roll paper is not stopped in a method where the transfer paper is stopped and then cut, slack will occur due to the inertia of the roll, and when the transfer paper is conveyed again, it will be pulled by the rollers, eliminating the slack in the roll. Since the weight of the entire roll is applied to the roller at the moment it becomes flattened, slipping occurs due to its inertia. Problems caused by this include a change in the cut length of the transfer paper, a decrease in roller feeding speed due to abrasion of the roller surface, and a further increase in the occurrence of slips due to a decrease in the coefficient of friction.

In order to avoid this problem, it is necessary to instantaneously stop the roll paper with high precision. Additionally, it is easier to control the roll paper after the cutter while it is being transported, so if you try to do that, you will be able to cut the roll paper immediately after the cutter by adding slack to the extent that the transfer paper is stretched. A curved guide plate, etc. must be provided. This slack control makes the mechanism even more difficult.

Due to the above-mentioned problems, the method of cutting the transfer paper while it is being conveyed has become popular.

By the way, in general, when a cutter cuts by having the blades contact each other over their entire length at once, the load during cutting becomes quite large. It's starting to get better. For this reason, in the case of a type in which the transfer paper is cut while being conveyed, if the cutter is arranged perpendicular to the roll conveyance direction, the cut will be diagonal due to the amount of movement of the transfer paper while cutting with the cutter. but,
This problem can be solved by arranging the cutter not at right angles to the roll conveyance direction but offset by the amount of diagonal cutting.

However, in this case, when the leading edge of the roll paper is manually cut after setting the roll paper, there is a problem that the leading edge of the transfer paper after being set is cut diagonally because the transfer paper is stationary.

(Purpose) The present invention was developed based on this background, and the purpose is to provide a mechanism for preventing diagonal cuts when setting roll paper in a roll paper feeding device that employs cutting during transport of roll paper. shall be.

(Structure) To achieve this, the present invention makes the cutter unit rotatable in the paper transport direction, and in conjunction with the pull-out and push-in operations of the paper feed unit, it is positioned at right angles to the paper transport direction when pulled out, and when pushed in. It is characterized in that it is provided so as to be inclined at a predetermined angle.

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

FIG. 1 shows a sectional view of a roll paper feeding device according to the present invention. Three rolls are set, and a transfer paper is sent out from any one of the first roll 1 to third roll 3 in response to a signal to start paper feeding, and the photosensitive drum 4 carrying toner and the transfer paper are fed from a developing section (not shown). By coming into close contact with it, it is possible to obtain a visualized copy. The main part of the roll feeder shown by the dashed line is supported by a slide rail (not shown) so as to be movable in the direction of arrow A.

When setting the roll, the first to third paper feed units 11
~Pull out 13 towards you. Then, the shafts and bearings of the rolls 1 to 3 are set from above into the notched holes in the side plates of the paper feed units 11 to 13, and the leading edge of the paper is grasped and inserted into the roller pairs 5, 6, and 7. After that, turn the knobs on the shaft ends of the roller pairs 5, 6, 7, and rotate the rotary blades 14, 1 of the cutters 8, 9, 10 as shown in FIG.
The leading edge of the paper is inserted between the blades 5, 16 and the fixed blades 17, 18, 19 and moved in the B direction. roller pair 5,
Since the roller pairs 17, 18, 19 after the cutters 8, 9, 10 are also rotating in synchronization with the rollers 6, 7, the leading edge of the paper is directly transferred to the paper feed units 11, 12, 13.
reach outside the frame.

In addition, in FIG. 2, fixed blades 17, 18, 19
is biased in the direction of arrow C about the fulcrum 20 by a torsion spring or the like (not shown). Almost at the tips of the fixed blades 17, 18, and 19, there is a blade 21 that is set perpendicular to the conveyance direction of the roll paper, and both ends of the blade 21 are rotary blades 1 that can rotate around a fulcrum 22.
4, 15, and 16 are in contact with large diameter rollers 24 at both ends. Flat part 2 of rotary blades 14, 15, 16
A blade 26 is installed on the rotating peripheral surface immediately in front of the rotating shaft 5 in a direction intersecting the support shaft 22. Further, the tip of the blade 26 is processed to have approximately the same shape as the outer diameter of the large-diameter roller 24, or to be slightly larger. In this state, when knobs (not shown) at the ends of the shafts of the rotary blades 14, 15, and 16 are rotated in the D direction, the paper is gradually cut from the back of the paper in FIG. If the cutters 8, 9, and 10 are set diagonally, the cut will be made diagonally, but in this application, cutters 8,
By making the support stands 27 of the cutters 9, 10 rotatable, the cutters 8, 9, 10 are automatically set at right angles to the roll conveyance direction. In other words, even when manually cutting, the cuts are at right angles.

Next, a mechanism for changing the attachment angles of the cutters 8, 9, and 10 will be explained with reference to FIG. Rotary blade 1
The shafts 31 and 32 of 4, 15 and 16 are the cutter side plates 3
It sticks out to the outside of 3,34. The support base 27 of the cutter has a hole located almost directly below the gear 35 of the shaft 32, and the shaft 36 passing through the hole is mounted on a bracket 37 fixed to the side plate of the paper feed unit 11, 12, 13. cutter unit 8,
9 and 10 are rotatable about a shaft 36. Axis 36 of cutter units 8, 9, 10
On the opposite side, there is an arc-shaped elongated hole 39 so that the collar of the shaft 38 functions as a stopper to prevent the cutter units 8, 9, and 10 from moving in the vertical direction in FIG. It's open. A bracket 37 is fixed to the paper feed units 11, 12, 13 via a bracket 42 with a motor 40 as a drive source for the rotary blades 14, 15, 16 and a gear 41 that meshes with the gear 35.
is installed on.

In order to make the manual cut rotate by one full rotation, gear 3 is set as shown in Figure 4.
If a one-turn clutch 43, a solenoid 44, a stopper 45, a clutch claw 46, and a cutter release button 47 are provided between 5 and 41, when the cutter release button 47 is pressed, the solenoid 44 is pushed in the direction of the arrow. Since the stop pawl of the one-turn clutch 43 moves instantaneously in response to the reaction force of the torsion spring generated by the stopper 45, when the clutch pawl 46 returns to its original position, the one-turn clutch 43
Since the other shaft end 31 of the rotary blades 14, 15, 16 can be easily rotated, and the stop pawl does not engage with the clutch pawl 46, the other shaft end 31 can be easily rotated. It starts to stop.

If it is possible to energize the motor 40 with the paper feed units 11, 12, and 13 pulled out, it is possible to automatically make one rotation by pressing the push button switch and counting with the encoder.

Again in FIG. 3, the paper feed units 11, 12,
A pin 49 is installed on the side plate 48 of 13, and a spring 50 connects the pin 49 to the cutter units 8, 9, 1.
It is hooked to the side plate 33 of 0. Therefore, the cutter units 8, 9, and 10 are about to rotate clockwise about the fulcrum 36 in FIG. However, since a part of the side plate 48 is bent and the cutter units 8, 9, and 10 come into contact with it, the cutter units 8,
9 and 10 are stopped, and this state is in the transport direction E.
The position is perpendicular to . In other words, unit 1
When the cutter units 1, 12, and 13 are pulled out, the cutter units 8, 9, and 10 are perpendicular to the conveyance direction E, so that no diagonal cutting occurs. However, unit 1
If the cutter units 8, 9, and 13 are pushed in, the stopper 52 raised from the main body frame 51 hits the bearing 53 installed on the shaft 31, so that the cutter units 8, 9, and 10 are moved perpendicularly to the conveying direction E. It is set tilted by θ with respect to the direction. θ
stopper 5 to allow precise adjustment after assembly.
2 may be made movable. bearing 5
A knob 54 for turning the rotary blade may be attached to the outside of 3. In this state, in order to prevent the gears 41 and 35 from meshing poorly, the gear 35 is
A fulcrum 36 is placed directly below. The one-turn clutch 43 is preferably a roller type clutch with a slight hysteresis.

Note that the fulcrums of the cutters 8, 9, and 10 do not need to be located at the ends, but may be located at the center. In this case, the cutter drive transmission means is better to use a pulley or chain rather than a gear. Furthermore, even if the cutter is not a rotary cutter but a guillotine cutter, it does not depart from the spirit of the present application.

(Effects) The present invention is as described above, and according to the roll paper feeder according to the present invention, it is possible to prevent diagonal cuts when setting the roll paper in a method in which the paper is cut during conveyance.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a roll paper feeding device according to an embodiment of the present invention, and FIG. 2 is a diagram showing the configuration of a cutter.
FIG. 3 is a diagram showing a cutter according to an embodiment of the present invention, in which a is a plan view, b is a side view, and FIG. 4 is an external perspective view of the cutter. 1, 2, 3... Roll paper, 8, 9, 10... Cutter, 11, 12, 13... Paper feeding unit.

Claims (1)

[Scope of claim for utility model registration] After pulling out the paper feed unit from the main body frame, set the roll paper, cut off the leading edge of the paper with a cutter, remove the pieces of paper, and then push the paper feed unit into the main body frame and set it again. In a roll paper feeder, the cutter unit is rotatable in the paper transport direction, and in conjunction with the pull-out and push-in operations of the paper feed unit, it is positioned perpendicular to the paper transport direction when pulled out, and positioned at a predetermined position when pushed in. A roll paper feeder characterized in that the cutter unit is arranged so as to be inclined at an angle of .