JPH09323292A - Sheet material cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rotate a rotary blade reversely when procedures for eliminating paper jam are taken and rotate it in the direction of cutting when it is desired to cut a sheet material manually by providing a release means which releases the transmission of driving force of a clutch to the rotary blade and enables manual rotation of the rotary blade at a position in the direction of shaft center of the rotary blade. SOLUTION: When it is desired to rotate a rotary blade 2 in the Q direction, namely, in the direction of anti-cutting or it is desired to rotate the rotary blade 2 in the P direction in order to perform manual cutting because paper jam occurs and the rotary blade 2 is stopped, a knob 15 is manually pressed in the arrow direction, namely, in the R direction against energizing force of a spring, and a gear 15a is meshed with a gear 14 attached on the rotary blade 2. A shaft 16 moves in the arrow direction, in the R direction and overrides on a bent part 4a of a lever 4, and the other end 4c of the lever 4 is disengaged from a claw part 3d of a spring clutch 3. Then, it is possible to rotate the rotary blade 2 freely in any direction without damaging the clutch 3 when the knob 15 is rotated manually because the gear 14 and the gear 15a are meshed each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet material cutting device which is mounted on an office machine such as a copying machine or a printer and cuts recording paper such as roll-shaped paper or film. More specifically, the present invention relates to a sheet material cutting device having a structure in which a spring clutch is used to intermittently or continuously transmit a driving force of a driving force to a rotary blade.

[0002]

2. Description of the Related Art In a sheet material cutting device such as a copying machine or a printer for cutting paper at a high speed, as a method of driving a rotary blade, the output of a motor is transmitted to the rotary blade via a spring clutch to intermittently cut the rotary blade. A mechanism for mechanically or continuously rotating and driving is widely known. A general structure of a sheet material cutting device of a type in which a rotary blade is driven by using such a spring clutch will be described with reference to FIG. The drive side shaft of the rotary blade 2 is attached to the output side 3b of the spring clutch 3, and the output side pulley 6b is attached to the input side 3a with a screw (not shown). The output side pulley 6b is connected to the input side pulley 6a via the timing belt 7, and the input side pulley 6a is connected to the motor 8
Fixed to the axis of.

In the sheet material cutting apparatus using the spring clutch, the motor is constantly rotating, and the rotation of the motor is always transmitted to the spring clutch 3 shown in FIG. 4 up to the input side 3a. Spring clutch 3
The general structure of is shown in FIG. This spring clutch 3
Has a coil spring that is locked inside the inner diameter of the collar 3c at the center and the clutch output side 3c. The lever 4 has a substantially central portion pivotally supported by a shaft 9, one end of which is attracted by a solenoid 5a to be swingable, and the other end of which is in contact with a claw of the collar 3c.

The iron core 5b of the solenoid is connected to one end of the lever 4 by a spring pin 11, and the coil spring 10 urges the iron core 5b in a pushing direction, so that the other end of the lever 4 is a claw of the collar 3c. It is designed to be pressed by. When the other end of the lever 4 is in contact with the claw of the collar 3c, even if the motor is rotated, the collar 3c does not rotate in the P direction, which is the cutting direction, and the rotary blade does not operate.

That is, the spring clutch 3 has a collar 3
When c is fixed, the coil spring mounted inside is open, so that the input side 3a and the output side 3b are separated from each other, and the rotation of the input side 3a is not transmitted to the output side 3b. . The output of the motor 8 can be transmitted to the movable blade 2 by applying a voltage to the solenoid 5a to attract the iron core 5b and removing the other end of the lever 4 from the claw. That is, when the other end of the lever 4 is disengaged from the claw and the collar 3c is opened, the collar 3c rotates with the rotation of the input side 3a and the internal coil spring is tightened to connect the input side 3a and the output side 3b. The driving force of the motor 8 is transmitted to the rotary blade 2.

Next, the electrical control method at the time of disconnection will be briefly described. In the standby position, as shown in FIG. 5, one end of the lever 4 is in contact with the claw of the collar 3c, and no voltage is applied to the solenoid 5a. When cutting is started, first, a voltage is applied to the motor to rotate the motor, but as described above, in this state, the rotary blade remains stopped even if the motor rotates. When it is desired to disconnect, when a voltage is applied to the solenoid 5a and one end of the lever 4 is attracted, the other end is disengaged from the claw of the collar 3c. Then, the input side 3a and the output side 3b of the clutch are connected, the driving force of the motor 8 is transmitted to the rotary blade 2, the rotary blade rotates, and the sheet is cut.

When the one end of the lever 4 is kept sucked, the rotary blade continues to rotate, but when it is desired to end the cutting operation once, the one end of the lever 4 has the claw of the collar 3c. It is only necessary to interrupt the voltage application to the solenoid 5a after being removed from the solenoid. Since the iron core 5b is not sucked in this way, the lever 4 is pushed by the urging force of the spring 10 and the other end of the lever 4 is again locked by the claw of the collar 3c. Since 3b is separated, the output of the motor is not transmitted and the rotary blade stops. A cutting device having a structure in which a driving force is transmitted using a spring clutch is disclosed in Japanese Utility Model Laid-Open No. 55-17922.
Although disclosed in No. 6, there is disclosed a rotation control device for eliminating the two-step disconnection problem caused by the inertia of the spring clutch.

[0008]

A sheet material cutting apparatus using the driving method having the above-mentioned structure has a practical problem in regard to a treatment method when the rotary blade is stopped due to a paper jam or the like. . When the sheets get caught while running and pile up multiple sheets, or when the cut sheets return to the cutter again and cut multiple sheets, the rotary blade stops in the middle without being able to cut. There is
If voltage is continuously applied to the motor with the rotary blades stopped, the same phenomenon as energizing the motor with the motor shaft locked may raise the winding temperature in the motor and damage the motor. Therefore, in such a case, in order to avoid damage to the motor in such a case, the voltage application is stopped after a few seconds when an abnormality occurs, but the rotary blade is inserted with the paper sandwiched between the fixed blade and the rotary blade. When stopped, electrical treatment cannot be performed. In other words, even if the motor is rotated in the reverse direction to rotate the rotary blade in this state, the sheet is hit again by the pinched sheet and stopped. Therefore, in a usual case, as shown in FIG. 4, a method of manually rotating the rotary blade 2 in the Q direction in the drawing by the knob 12 connected to the rotary blade 2 to remove the jammed paper is adopted.

However, a problem in manually rotating the rotary blade is that the spring clutch may be damaged. When the knob is rotated in the Q direction, the coil spring inside the clutch is tightened, so that the output side 3b and the input side 3a of the clutch are connected, and the output side pulley 6b is connected.
Since the motor shaft is rotated through the timing belt 7 and the input side pulley 6a, the clutch is not damaged in this state. By the way, since the motor shaft must be rotated, in the case of a motor with a large reduction ratio,
Although the torque value for rotating the knob 12 is considerably large, in order to remove the jammed paper, it is sufficient to rotate the rotary blade only a little, so there is no particular problem in use. However, if the coil spring is mistakenly rotated in the P direction in the figure, the coil spring inside the clutch is opened.

Normally, since the voltage applied to the solenoid 5a is also in a stopped state, the lever 4 is in a state of being caught by the pawl and the collar 3c of the clutch is in a state of not rotating. If the knob 12 is continuously rotated in the P direction in this state, the coil spring inside the clutch may be largely opened and deformed. If the coil spring is deformed and its inner diameter becomes large, it becomes impossible to connect the input side 3a and the output side 3b, and the output of the motor cannot be transmitted to the rotary blade. To tell. The above-mentioned problem is caused when the manual knob 12 is erroneously rotated in the P direction during jam processing, but the possibility of forcibly rotating the manual knob 12 in the P direction is not limited to erroneous operation when a paper jam occurs. When the manual knob 12 is equipped, when the user replaces the paper and wants to cut only one edge of the paper, the rotary blade can be manually rotated to cut without driving the motor. In this case as well, the clutch may be damaged as described above.

As a method of preventing the damage of the clutch,
As shown in FIG. 5, a handle 13 that can manually push the lever 4 is provided, and when the knob 12 is rotated in the P direction, the handle 13 is pushed in the direction of the arrow in advance to leave the spring clutch in a free state. Although there is a method of rotating the knob 12 while maintaining the pressed state, this method is not a reliable method because the operation is troublesome and the handle 13 may be forgotten to be pressed. As an example of mechanically improving such a problem, Japanese Patent Application Laid-Open No. 58-2022
No. 51 and Japanese Patent Publication No. 12638 (JP-A-58-202)
No. 250).

According to the method described in Japanese Patent Laid-Open No. 2022021/1983, a multi-joint link is provided between the knob 12 and the lever 4, and the lever is connected to the clutch via the link according to the rotation of the knob. The ratchet mechanism is provided on the shaft portion of the knob 12, and when the knob is rotated in the Q direction in the drawing, the lever 4 operates by the action of the ratchet, but when rotated in the P direction, the lever 4 is operated. Is designed so that it does not operate. On the other hand, JP-A-58-202250
The joint is additionally equipped between the spring clutch and the rotary blade with a built-in coil spring for restricting the rotation direction to one direction. A structure is disclosed that can be reversed only in the direction.

However, among the above-mentioned devices, Japanese Patent Application Laid-Open No. 58-58
The device described in -202251 is provided with a ratchet mechanism on the shaft portion of the knob 12 as described above, and a multi-node link is provided between the knob 12 and the lever 4,
Further, in the device of Japanese Patent Laid-Open No. 58-202250, a joint member is provided between the spring clutch and the rotary blade, and each device uses a large number of parts having complicated shapes, resulting in high cost.

Further, when a paper jam occurs, the rotary blade is restricted so as to be manually rotated only in one direction opposite to the cutting direction. Therefore, when the paper is replaced, the paper edge is also manually cut at only one place. It is not possible to meet the demand for desire. The present invention takes the above problems into consideration,
It is possible to reverse the rotary blade when processing paper jams, and when the paper is swapped, you can also rotate it in the cutting direction when you want to manually cut the paper edge, and also prevent damage to the spring clutch. It is an object of the present invention to provide a sheet material cutting device that can be operated at low cost and can be operated reliably.

[0015]

The present inventor has solved the above-mentioned problems and is capable of easily rotating a rotary blade both when processing a paper jam and when manually cutting, that is, The present invention has been completed as a result of studying an inexpensive and reliable method in which the rotary blade can be manually rotated in both directions and which can prevent damage to the clutch. That is,
Specifically, the present invention is a rotary blade that is rotatably or swingably supported and has a manual rotation device at its end, a fixed blade that is arranged to cross-contact the blade edge of the rotary blade, and a drive blade. In a sheet material cutting device that transmits a driving force of a power source to a rotary blade via a clutch, the rotary blade is released to a position in the axial direction of the rotary blade, and the drive force of the clutch is released to the rotary blade. The sheet material cutting device is provided with a releasing means that enables manual rotation of the sheet material.

The means for canceling the transmission of the driving force is
The knob is mounted near the end of the rotary blade, and the rotary blade is rotated while pressing the knob, and one end contacts the end surface of the knob and the other end presses a lever connected to the clutch. And a member that swings the lever.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION In the sheet material cutting device of the present invention, when a knob mounted near the end of a rotary blade is pushed by hand, a member for swinging the lever is pushed to abut on a part of the lever. By doing so, the clutch is released, and the transmission of the driving force to the rotary blade is released. Then, when the knob is pushed in, the knob and the shaft end of the rotary blade are connected, and if the knob is pushed in and then rotated, the rotary blade can be manually rotated in both the anti-cutting direction and the cutting direction. Can be done. The member that abuts the knob and swings the lever is a long shaft-shaped member that is lightweight and simple, and it is good to provide a protrusion on the lever at a position where the member that swings the lever and the lever come into contact with each other. Then
Further, it is desirable to bend this protrusion so that the lever can swing easily.

The above-mentioned knob and rotary blade may be connected to each other by using a friction wheel, a gear or the like as appropriate, but the gear shape is simple and the transmission of rotation is reliable and easy to use. Furthermore, the knob and the shaft of the rotary blade may be directly connectable, or if a gear is fixed to the end surface of the knob and a gear is also provided on the shaft of the rotary blade, the manual knob of the knob can be set by setting the number of teeth of the gear. It is also possible to reduce the rotational force. With the sheet material cutting device according to the present invention having the above-described structure, the connection between the drive source and the rotary blade can be released, so that when the paper jam occurs, the rotary blade is manually rotated in the anti-cutting direction and is sandwiched. The paper can be removed, and when it is desired to manually cut the paper, the rotary blade can be rotated in the cutting direction to cut the paper. When performing such work, the spring clutch and the lever can be unlocked regardless of whether the rotary blade is rotated in the cutting direction or the anti-cutting direction, so that there is no fear of damaging the spring clutch. .

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to embodiments and drawings. FIG. 1 shows an embodiment of a sheet material cutting device according to the present invention. The driving force transmission method shown in FIG. 1 transmits the rotational driving force of a motor to a rotary blade via a pulley, a timing belt, and a spring clutch, and its basic structure is the same as that of FIG. 5 described above. Therefore, the feature of this embodiment is that the knob 1 provided integrally with the "gear 14" and the "gear 15a" provided on the non-driving side of the rotary blade.
5 "and" a shaft 16 arranged substantially parallel to the rotary blade ". A gear 14 provided on the opposite side of the rotary blade converts the knob 12 shown in FIG. 4 into a gear 14, and integrally forms a gear 5a and a knob 5 that mesh with the gear 14 when necessary. The lever 4 is characterized in that the bent portion 4a is provided.

The knob 15 is for manually rotating the rotary blade, and is arranged on a shaft (not shown) provided in a position close to the rotary blade, and is usually indicated by an arrow S by a spring (not shown).
In this state, the gear 15a and the gear 14 are not in mesh with each other. If the rotary blade stops due to a paper jam during cutting, the motor shaft will be locked. If you continue to energize the motor in the locked state, the temperature of the motor winding will rise, which may result in deterioration of the motor performance and in some cases, such as winding breakage.Therefore, normally apply a voltage to the motor immediately after a paper jam. Control to stop.
In addition, generally, while the rotary blade is manually rotated, voltage application to the motor and solenoid is stopped to prevent electric shock.Therefore, when manually rotating, the motor is in the stopped state, the solenoid is in the non-excitation state, and the solenoid is in the non-excitation state. In the case of the state, the iron core 5b of the solenoid holds the state of being pushed out by the spring 10, so that the other end 4c of the lever 4 is in a state of being pressed against the claw portion 3d of the clutch 3.

When it is desired to rotate the rotary blade in the Q direction, that is, the anti-cutting direction because a paper jam has occurred and the rotary blade has stopped,
Or the rotary blade for P direction (cutting direction) for manual cutting
When it is desired to rotate to the direction of arrow, the knob 15 is manually pushed in the direction of arrow R against the urging force of the spring to mesh the gear 15a with the gear 14 attached to the rotary blade. The shaft 16 has a long rod shape, and both ends thereof are axially supported in a position substantially parallel to the rotary blade so as to be movable in the directions of arrows S and R.
Is also urged in the direction of arrow S by a spring (not shown), and the right end of the figure is in a state of being pressed against the end surface of the knob 15. When the knob 15 is pushed in the direction of arrow R, the shaft 16 simultaneously moves in the direction of arrow R. Move in the direction. The lever 4 has a bent portion 4a having a bending angle of about 45 ° at a position on the extension line of the left end of the shaft 16.
Normally, the bent portion 4a is separated from the shaft 16, and when the shaft 16 moves in the direction of the arrow R, the left end of the shaft 16 hits the bent portion and the lever 4 swings. To do.

2 and 3 are perspective views showing the relationship between the knob 15, the shaft 16 and the lever 4. FIG. 2 shows a normal state in which the lever 4 is hooked on the claw of the collar 3c of the clutch. When the shaft 16 moves in the direction of the arrow R in FIG. 1, the shaft 16 moves toward the bent portion 4a of the lever 4 as shown in FIG.
Since the lever 4 rides on, the other end 4c of the lever 4 is centered around the fulcrum 9 and the claw portion 3d of the spring clutch 3 is engaged.
Get out of. When the knob 15 is pushed in the direction of arrow R, the gear 14
And the gear 15a mesh with each other, so that the knob 15 is manually rotated so that the other end 4c of the lever 4 and the spring clutch 3 can be rotated.
Since it is possible to rotate the rotary blade 2 while keeping the state of being disengaged from the claw portion 3d, it is possible to freely rotate the rotary blade 2 without damaging the clutch.
Therefore, the position of the bent portion provided on the lever 4 needs to be an intermediate position between the solenoid 5a and the shaft 9. That is, in the sheet material cutting device of the present invention, by operating the knob by mounting the connecting / disconnecting means, the engagement between the lever and the claw portion is released, and at the same time, the operation of rotating the knob and manually rotating the rotary blade can be performed. Since it can be done with one hand, the paper jam can be removed with the free hand.

Further, it is possible to reduce the torque value for rotating the rotary blade by changing the number of teeth of the gear 14 and the gear 15a. For example, the gear 14 has 30 teeth and the gear 1
Assuming that the number of teeth of 5a is 15, the reduction ratio is 2: 1, so it is possible to rotate the rotary blade with a torque value of 1/2 compared with the case where the rotary blade is directly rotated. In the conventional device shown in FIG. 4, since the rotary blade is directly rotated by the knob attached to the rotary blade, when the rotary blade is rotated in the anti-cutting direction (Q direction) during paper jam, the motor shaft is also rotated. Since it is necessary, a motor having a large reduction ratio requires a very large torque value.

When cutting by manual rotation, it is not necessary to rotate the motor shaft in conjunction with each other, but a large torque value is required when cutting thick paper, and therefore it cannot be easily rotated. Further, if the outer diameter of the knob is increased, the driving force on the outer circumference of the knob is reduced, so that the knob can be rotated easily, but it is disliked to increase the knob for the sake of space. Therefore, the gear 14 and the gear 15a
It is desirable to change the number of teeth.

[0025]

As described above, according to the present invention, the rotary blade that is rotatably or swingably supported and the fixed blade and the shaft of the rotary blade that are arranged so as to press the blade edge against the rotary blade are connected. In the sheet material cutting device including the spring clutch for drive transmission, the rotary blade is attached with an interrupting means for interrupting the transmission of the driving force, so that the rotary blade is rotated in the anti-cutting direction during paper jam and is sandwiched. The sheet can be removed, and when it is desired to manually cut the sheet, the rotary blade can be easily rotated by rotating in the cutting direction. Further, even when the rotary blade is rotated in any direction, the lever engaged with the claw portion of the spring clutch is released, so that the spring clutch is not damaged. Further, since the structure of the present invention is very simple, there is no cost increase as in the conventional product, so that the industrial effect is very large.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a sheet material cutting device of the present invention.

FIG. 2 is a side view showing the relationship between the clutch and the lever according to the embodiment of the sheet material cutting device of the present invention.

FIG. 3 is a perspective view (No. 1) showing the positional relationship between the shaft and the lever according to the embodiment of the sheet material cutting device of the present invention.

FIG. 4 is a perspective view (No. 2) showing the positional relationship between the shaft and the lever, showing an embodiment of the sheet material cutting device of the present invention.

FIG. 5 is a perspective view (No. 1) showing an example of a conventional technique relating to the sheet material cutting device of the present invention.

FIG. 6 is a perspective view (No. 2) showing an example of the prior art relating to the sheet material cutting device of the present invention.

FIG. 7 is a cross-sectional view showing a general structure of a spring clutch according to the sheet material cutting device of the present invention.

[Explanation of symbols]

1 fixed blade, 2 rotary blades, 3 spring clutch,
3a Clutch input side, 3b Clutch collar, 3c
Clutch output side, 3d claw portion, 4 lever, 4a bent portion, 4b one end, 4c other end, 5a solenoid,
5b iron core, 6a pulley input side, 6b pulley output side, 7 timing belt, 8 motor, 9 shafts,
10 coil spring, 11 spring pin, 12 knob, 13 knob, 14 gear, 15 knob, 15a gear, 16 axis, P cutting direction, Q anti-cutting direction, R knob pushing direction, S knob biasing direction

Claims (2)

[Claims] 1. A rotary blade which is rotatably or swingably supported and has a manual rotating device at its end, a fixed blade which is arranged so as to cross-contact the blade edge with the blade edge of the rotary blade, and a drive source. In a sheet material cutting device that transmits a driving force to the rotary blade via a clutch, the transmission of the driving force to the rotary blade of the clutch is released to a position in the axial direction of the rotary blade, and the rotary blade is manually operated. A sheet material cutting device having a releasing means capable of rotating. 2. A means for releasing the transmission of the driving force includes a knob mounted near the end of the rotary blade, the rotary blade being rotated while the knob is being pressed, and one end of which is in contact with the end surface of the knob. The sheet material cutting device according to claim 1, further comprising: a member that is in contact with the other end of the clutch and presses a lever that is connected to the clutch to swing the lever.