JPH09216192A - Sheet material cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a movable blade rotate freely for easy corrective action against a paper jamming by making engagement between a worm wheel and a worm gear in/out freely. SOLUTION: A movable blade 1 is fixed at a movable blade platform 3 and rotatably-pivoted at an inner shaft than the frame 5 of a supporting shaft 4 which is inserted into and planted at a bearing 5a at the end part of the frame 5. A fixed blade 2 which includes a linear blade tip is fitted at the frame 5, and when the movable blade platform 3 rotates, the blade tip of the movable blade 1 comes into sliding contact with the blade tip of the fixed blade 2 to cut a sheet material. A worm wheel 21 is rotatably-pivoted at a shaft 8 which is fixed at an extension frame T of the frame 5, a driving pin which is fitted at an end surface is inserted into the long hole 6c of a driving arm 6 so that it may slide, and the rotational movement of the worm wheel 21 is changed into sliding movement of the driving arm 6. The worm wheel 21 is rotated and driven by a motor 23 by engaging with an ohm gear 22. It is thus possible to conduct disengagement easily and remove paper jamming easily when it occurs.

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 office equipment such as a facsimile machine and a copying machine and cuts a sheet material such as recording paper or film.

[0002]

2. Description of the Related Art In a rotary type sheet material cutting apparatus which cuts a sheet material by slidingly contacting a fixed blade with a movable blade which rotates, a worm gear is driven by a motor and meshes with a movable blade driving mechanism. A combination of a worm gear and a crank mechanism that gives a swing motion to a drive arm by a drive pin provided on an end surface of a worm wheel to rotate a movable blade is often adopted. Further, also in the slide type sheet material cutting device which cuts the sheet material by slidingly contacting the fixed blade with the movable blade which moves linearly, a similar mechanism is adopted as a drive mechanism of the movable blade.

In such a sheet material cutting device, when a paper jam occurs in the cutter portion where the movable blade and the fixed blade mesh with each other, one operation of the movable blade is completed within a predetermined time in order to prevent overheating of the motor. Therefore, an overload prevention device is provided that shuts off the current of the motor to stop it when the system does not return to the standby state. Therefore, if a paper jam occurs, the fixed blade will stop at that position, so in order to remove the paper jam caught in the cutter, use a tool such as a screwdriver to reverse the motor shaft and move the movable blade. It was necessary to return to the standby position or move the paper by hand to the gap between the blades where the movable blade and the fixed blade do not engage with each other to remove the paper jam with the fingertips, which was very troublesome work.

On the other hand, a relational part such as a cross groove is provided at the end of the motor shaft, and a tool such as a screwdriver is inserted through a hole provided in the main body case and engaged with this relational part to reverse the motor shaft. Mechanism for removing paper jam
The invention described in Japanese Patent No. 7877 is disclosed. Further, as a mechanism for preventing the motor from overloading, one link of the four-bar linkage mechanism for driving the movable blade is replaced with a tension spring, and when the movable blade is overloaded, this spring expands to cause an overload. 62-147491 with a structure that avoids
In the case of overloading, the invention described in Japanese Patent Publication No. 1993-121952, or a split groove is provided in the connecting rod of the drive mechanism to give elasticity, and the arm shaft of the drive arm is elastically fitted in the axial groove of this connecting rod. Has a structure in which the arm shaft is disengaged from the shaft groove.
The invention described in Japanese Patent No. 595 is disclosed. Even in such a sheet material cutting device, the engagement between the movable blade and the drive unit is released when a paper jam occurs, so that the paper jam can be easily removed by freely moving the movable blade.

[0005]

However, in the sheet material cutting device described in Japanese Patent Laid-Open No. 5-337877, there is an advantage that the paper jam is removed without removing the main body case, but a tool such as a screw driver is used. Then, the motor shaft must be rotated many times, which is inconvenient and time-consuming. In addition, actual development Sho 62-147491
In the sheet material cutting device described in the publication, the magnitude of the load is not constant depending on the cutting position, the force applied to the tension spring is unstable, and the stability of the operation is lacking. When the load is increased due to a change in the number of times, the movable blade is stopped due to the above-mentioned means for preventing overload, and an uncut portion may occur. Therefore, it is necessary to design with a margin for the load, which may cause the overload prevention means to fail depending on the cutting position. JP-A-3-22859
The sheet material cutting device described in Japanese Patent No. 5 has the same problem.

Therefore, in order to solve the above-mentioned problem, the applicant has made it possible to freely rotate the movable blade by releasing the connection between the drive source and the movable blade when a paper jam occurs and the movable blade stops. Focusing on the fact that the paper jam can be easily removed by doing so, a sheet material cutting device disclosed in Japanese Patent Laid-Open No. 7-266285 in which the drive arm is moved in the longitudinal direction of the movable blade so that the drive member can be detached first is disclosed. did.

The present invention is a further development of this invention, in which the engagement of the worm wheel for driving the drive arm and the worm gear is made detachable so that the movable blade can be freely rotated and paper jams can be easily treated. It is an object of the present invention to provide a sheet material cutting device which is capable of highly reliable cutting.

[0008]

In order to achieve the above object, a sheet material cutting device of the present invention comprises a fixed blade mounted on a frame, and a movable blade for cutting the sheet material in cooperation with the fixed blade. A drive member that drives the movable blade, a worm wheel that engages with the drive member to drive the movable blade, and a worm gear that meshes with the worm wheel, and rotationally drives the worm gear to fix the movable blade A sheet material cutting device that cuts a sheet material by slidingly contacting the blade tips of the blades is provided with an attaching / detaching means for detachably engaging the worm wheel and the worm gear.

That is, the sheet material cutting device of the present invention is
Since the worm wheel that drives the movable blade and the engagement of the worm gear can be attached and detached freely,
When a paper jam occurs and the movable blade stops while biting the paper, the mesh of the worm wheel and the worm gear is disengaged, and the movable blade can be manually and easily reversed to remove the paper jam.

It is easy for the attaching / detaching means to be provided with a moving mechanism for detachably engaging the worm gear and the worm wheel by moving the worm gear shaft in a direction parallel or at a right angle to the shaft of the worm wheel. It is desirable as an attaching / detaching mechanism, and the attaching / detaching means attaches the motor to the worm gear, a motor case for holding the motor, and the motor case so as to attach and detach the mesh between the worm gear and the worm wheel. And a holder member for movably holding the motor case in parallel or at a right angle, and a biasing means for biasing the motor case in a direction of moving the motor case to a position where the worm gear and the worm wheel mesh with each other. Remove the mesh between the worm gear and the worm wheel. Processing the paper jam can be, because after a paper jam is returned to engagement position of the original worm gear and worm wheel by the biasing force of the biasing means, requires no effort.

Further, the attaching / detaching means includes a tilting mechanism for tiltably supporting the shaft of the worm gear so as to attach / detach the mesh between the worm gear and the worm wheel, and a tilting bias in a direction in which the worm gear and the worm wheel mesh with each other. The structure may include a biasing means.

The sheet material cutting apparatus according to the present invention may be used in a rotary cutting apparatus in which a movable blade is rotationally moved so that the blade edge is in sliding contact with a fixed blade edge to cut a sheet material, or the movable blade is linearly moved. It can also be used in a slide-type cutting device in which the blade edge slides into contact with the fixed blade edge to cut the sheet material.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to an embodiment shown in the drawings. FIG. 1 is an exploded perspective view showing a configuration of a main part of a sheet material cutting device according to a first embodiment of the present invention, and FIG. 2 is a mesh of a worm gear and a worm wheel of the sheet material cutting device according to the first embodiment of the present invention. FIG. 3 is a front view of the state in which the worm gear and the worm wheel are disengaged from each other.

In these figures, the movable blade 1 is fixed to the movable blade base 3, and the movable blade base 3 is planted by penetrating the bearing 5a at the end portion of the frame 5 by the shaft hole 3b provided in the flange 3a thereof. The support shaft 4 provided is rotatably supported by a shaft inside the frame 5. A fixed blade 2 having a substantially straight blade edge is attached to the frame 5, and when the movable blade base 3 rotates, the blade edge of the movable blade 1 comes into sliding contact with the blade edge of the fixed blade 2 to cut a sheet material (not shown). . The drive arm 6 constituting the drive member has a shaft hole 6 near the upper end of the central portion thereof.
a is provided, and a shaft of the support shaft 4 outside the frame 5 is inserted into the shaft hole 6a and is rotatably supported. A through hole 6b is provided at the upper end of the drive arm 6, and the through hole 6b is formed.
The screw 12 inserted into the screw is screwed into the screw hole 3c of the flange 3a of the movable blade base 3 with the spacer 11 interposed therebetween to integrally fix the upper end of the drive arm 6 and the flange 3a of the movable blade base 3 together. There is. As a result, the swing motion of the drive arm 6 swinging around the support shaft 4 is transmitted as the rotary motion of the movable blade base 3. On the lower end side of the drive arm 6, there is provided an elongated hole 6c into which a drive pin 24 provided on the end surface of the worm wheel 21 is slidably inserted.

The worm wheel 21 is rotatably supported by a shaft 8 fixed to the extension frame 7 of the extension portion of the frame 5, and a drive pin 24 planted on the end face of the worm wheel 21 has a long hole of the drive arm 6. It is slidably inserted into 6c to convert the rotational movement of the worm wheel 21 into the swing movement of the drive arm 6. A worm gear 22 meshes with the worm wheel 21 and is rotated by a motor 23.

The holder member 7 is provided on the lower side of the extension frame 7.
1 is formed integrally with the extension frame 7, and holds the motor case 31 fitted on the outside thereof so as to be slidable in the axial direction of the shaft 8. The holder member 71 has an opening consisting of side plates 73, 73 extending in parallel with the shaft 8 from each side of the end plate 72 arranged at a right angle to the shaft 8 in parallel with the shaft 8, an upper plate 74 and a lower plate 75. It has a box shape. Upper plate 74 and lower plate 75
The notch 74a into which the motor 23 is inserted.
And 75a are provided.

Motor 2 having a worm gear 22 fixed to its shaft
3 is fixed inside the motor case 31. The motor case 31 has a cylindrical box shape composed of a front box plate 32, side box plates 33, 33 on both sides, and a rear box plate 34, and an upper box plate 35 for mounting the motor 23 is provided on the upper side. .
The motor case 31 is fitted to the holder member 71 such that the inner surfaces of the side box plates 33, 33 on both sides are in sliding contact with the outer surfaces of the side plates 73, 73 of the holder member 71, and the upper surface of the upper box plate 35 and the holder member 71 are fitted. After fitting so that the lower surface of the upper plate 74 abuts, the pins 76 are provided on both side surfaces of the lower plate 75.
It is driven into 5b to support the lower end of the side box plate 33. As a result, the motor case 31 can be slid in the axial direction of the shaft 8 to form a moving mechanism as an attaching / detaching means. Although not shown, two pins 76 are provided on each side to stably support the lower end of the motor case 31.

As shown in FIG. 2, the motor case 31 is located on the left side of the drawing, and the inner surface of the front box plate 32 is the holder member 71.
The worm gear 22 meshes with the worm wheel 21 at a position where it comes into contact with the outer surface of the end plate 72. Then, as shown in FIG. 3, when the motor case 31 slides to the right side of the drawing, the worm gear 22 and the worm wheel 21 are disengaged from each other. Motor 23
A coil spring 41 as a biasing means is fitted between the side surface of the motor case 3 and the inside of the end plate 72 of the holder member 71.
1 is urged to slide to the left side of the figure. Due to this biasing force, the motor case 31 is in the left position shown in FIG. 2 during normal cutting, and the worm gear 22 and the worm wheel 21 are held in a meshed state.

The operation of the sheet material cutting device having the above-described structure of the present invention will be described below. Worm gear 22 shown in FIG.
When the movable blade 1 is in the standby position with the worm wheel 21 engaged with the motor 23, the worm wheel 21 rotates when the motor 23 is rotated, and the drive pin 24 of the worm wheel 21 slides in the long hole 6c of the drive arm 6. The drive arm 6 is swung. When the drive arm 6 swings, the screw 1
The movable blade base 3 rotates in the cutting direction via the blade 2, and the blade edges of the movable blade 1 and the fixed blade 2 are brought into sliding contact with each other to cut the sheet material (not shown) inserted between the blade edges. When the cutting is completed and the worm wheel 21 further rotates, the movable blade base 3 changes its rotating direction opposite to the cutting direction and returns to the original standby position.

Although the above operation is repeated in the normal cutting, when a paper jam occurs in the cutter portion where the movable blade 1 and the fixed blade 2 mesh with each other, the electric current is cut off by the overload preventing means and the motor 23 is stopped to move. The blade 1 stops at that position while sandwiching the paper jam. So to handle this,
The motor case 31 is pushed and slid in the arrow X direction shown in the figure against the biasing force of the coil spring 41. Then, as shown in FIG. 3, the worm gear 22 and the worm wheel 2
1, and the worm wheel 21 can be manually rotated freely. Therefore, by rotating the worm wheel 21 by hand and reversing the movable blade 1, the paper jam can be easily removed. When the pushing of the motor case 31 is stopped except for the paper jam, the motor case 31 slides to the left in the figure due to the biasing force of the coil spring 41,
The worm gear 22 and the worm wheel 21 are brought into engagement with each other to return to the original position of FIG. 2 and the cutting can be restarted.

As described above, the sheet material cutting apparatus according to the embodiment of the present invention is provided with the attaching / detaching means for making the meshing of the worm gear 22 and the worm wheel 21 attachable / detachable by sliding the motor case 31. When a jam occurs, the paper jam can be quickly and easily removed by simply disengaging the worm gear 22 and the worm wheel 21 without using a special tool. Further, since the worm gear 22 and the worm wheel 21 have an urging means for slidingly returning the motor case 31 in a direction in which the worm gear 21 and the worm wheel 21 engage with each other, the paper jam can be immediately removed and the processing can be immediately returned to the original position. . Further, since the motor case 31 is held by the holder member 71 which is integrated with the extension frame 7, even if a force is applied to the worm gear 22 in a direction perpendicular to the axis of the worm wheel 22, the meshing will not be disengaged. Therefore, the above-mentioned actual exploitation 62-14749
Unlike the sheet material cutting device described in Japanese Patent No. 1 Publication, the drive member does not come off due to fluctuations in the cutting load, and uncut uncut parts cannot be cut normally, resulting in high cutting reliability.

FIG. 4 is a front view of the sheet material cutting device of the second embodiment of the present invention, and FIG. 5 is a side view of the sheet material cutting device of the second embodiment of the present invention in which the worm gear and the worm wheel are in mesh with each other. FIG. 6 is a side view showing a state where the worm gear and the worm wheel are out of mesh with each other. In the sheet material cutting device of the first embodiment, the attaching / detaching means for attaching / detaching the mesh of the worm gear and the worm wheel is adopted by sliding the worm gear in the axial direction of the worm wheel, but in the sheet material cutting device of the second embodiment, The difference is that the worm gear is used as a moving unit that slides in a direction perpendicular to the shaft of the worm wheel, and a detaching unit that attaches and detaches the engagement between the worm gear and the worm wheel is adopted. Since there is basically no difference from the first embodiment in other points, FIGS.
The same symbols are used.

In the sheet material cutting apparatus of this embodiment, the motor case 31 is supported by the holder member 71 so as to be slidable in the direction perpendicular to the shaft 8, and at the standby position, the motor is driven by the biasing force of the coil spring 41 as shown in FIG. The case 31 is held at a position where the worm gear 22 and the worm wheel 22 mesh with each other. When a paper jam occurs and the movable blade stops, the worm gear 2 is pressed when the motor case 31 is pushed in the arrow Y direction shown in FIG. 6 against the biasing force of the coil spring 41.
2 and the worm wheel 21 are disengaged so that the worm wheel 21 can rotate freely. As a result, the paper jam can be easily treated as in the sheet material cutting device of the first embodiment. In the sheet material cutting device of the first embodiment, the motor case 31 is held outside the holder member 71, whereas in the sheet material cutting device of the second embodiment, the motor case 31 is held.
The holder member 71 is held inside, but any of them may be used.

FIG. 7 is a front view of the sheet material cutting device of the third embodiment of the present invention, and FIG. 8 is a side view of the sheet material cutting device of the third embodiment of the present invention in which the worm gear and the worm wheel are engaged with each other. FIG. 9 is a side view showing a state where the worm gear and the worm wheel are disengaged from each other. In these figures, the same symbols as those in the above figures are used. The sheet material cutting device according to the present embodiment differs from the first and second embodiments in that an attaching / detaching means for attaching / detaching the mesh of the worm gear and the worm wheel is adopted by using a tilting mechanism for tilting the worm gear. In other respects, there is basically no difference from the first embodiment.

In the tilting mechanism according to the present embodiment, as shown in FIG. 7, a tilting shaft 25 is provided on the outer circumference of the cage of a motor 23 having a worm gear 22 fixed to a rotating shaft, and the tilting shaft 25 is provided on a holder member 71. The tilt bearing 77 is tiltably supported. In addition, as shown in FIG.
If it is difficult to dispose the tilting shaft 25 directly on the outer circumference of the cage of No. 3, although not shown, the body of the motor 23 is held by a band-shaped member and the tilting shaft 2 is attached to the band-shaped member.
5 may be fixed, or the tilting shaft 25 may be fixed to the motor case 31 to which the motor 23 is fixed as in the first embodiment or the second embodiment, and the tilting shaft 25 may be pivotally supported. A handle 26 is provided above the motor 23, and a coil spring 42 is provided between the handle 23 and the extension frame 7. The urging force of the coil spring 42 causes the worm gear 22 and the worm wheel 22 to move in the standby position as shown in FIG. It is designed to be held in a meshed state. As a result, when the paper jam occurs and the movable blade 1 stops, when the handle 26 is pulled in the arrow Z direction shown in the figure against the biasing force of the coil spring 42, the motor 23 tilts and the worm gear 22 and the worm wheel. 21 can be disengaged, and the worm wheel 21 can freely rotate, so that the paper jam can be easily treated as in the above embodiments.

In the sheet material cutting devices of the second and third embodiments, the worm wheel 21 is used when the driving force is transmitted.
The worm gear 22 against the force acting in the direction perpendicular to the axis of
Since it is supported by the biasing force of the coil springs 41 or 42, the biasing force of the coil springs 41, 42 must be strong enough to counter this force. In this case, by providing locking means (not shown) against the slide of the motor case 31 or the tilting of the motor 23,
The biasing force of the coil springs 41, 42 can be reduced.

FIG. 10 shows a fourth embodiment in which a movable arm 51 is linearly moved up and down by a drive arm 56 swingably driven by a drive pin 31 of a worm wheel 21 to cut a sheet material between a fixed blade 52. It is a conceptual diagram which shows a slide type sheet material cutting device. Although the first to third embodiments have been described with respect to the rotary sheet material cutting device, FIG.
As shown in FIG. 4, each attaching / detaching means for attaching / detaching the mesh of the worm gear 22 and the worm wheel 21 of the first to third embodiments can be adopted also in the slide type sheet material cutting device, and the same effect as the rotary type sheet material cutting device can be adopted. Is obtained.

[0028]

As described above, the sheet material cutting device of the present invention is provided with the attaching / detaching means for detachably engaging the worm wheel and the worm gear for driving the movable blade through the driving member. When a paper jam occurs, the engagement between the worm wheel and the worm gear can be easily released by this attaching / detaching means. This allows you to manually rotate the worm wheel,
The paper jam can be easily removed.

The attaching / detaching means is adapted to slide the motor case holding the motor connected to the worm gear or to tilt the worm gear shaft to attach / detach the mesh between the worm gear and the worm wheel. Since the worm gear is urged to move or tilt to the position where it meshes with the worm wheel, the meshing can be easily attached and detached, and the paper jam can be quickly processed.

By sliding the motor case in the axial direction of the worm wheel to engage and disengage the worm gear and the worm wheel, the worm gear can be easily held against the force applied to the worm gear perpendicular to the axis of the worm wheel. Therefore, stable cutting can be performed even when the load changes due to cutting.

The sheet material cutting device according to the present invention can be applied to both a rotary cutting device and a slide cutting device.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a configuration of a main part of a sheet material cutting device according to a first embodiment of the present invention.

FIG. 2 is a side view showing a state in which a worm gear and a worm wheel of the sheet material cutting device according to the first exemplary embodiment of the present invention are in mesh with each other.

FIG. 3 is a side view of the sheet material cutting device according to the first exemplary embodiment of the present invention with the worm gear and the worm wheel disengaged from each other.

FIG. 4 is a front view of a main part of a sheet material cutting device according to a second embodiment of the present invention.

FIG. 5 is a side view showing a state in which a worm gear and a worm wheel of the sheet material cutting device according to the second exemplary embodiment of the present invention are in mesh with each other.

FIG. 6 is a side view of the sheet material cutting device according to the second exemplary embodiment of the present invention with the worm gear and the worm wheel disengaged from each other.

FIG. 7 is a front view of a main part of a sheet material cutting device according to a third embodiment of the present invention.

FIG. 8 is a side view showing a state in which a worm gear and a worm wheel of the sheet material cutting device according to the third exemplary embodiment of the present invention are in mesh with each other.

FIG. 9 is a side view of the sheet material cutting device according to the third exemplary embodiment of the present invention with the worm gear and the worm wheel disengaged.

FIG. 10 is a front view of a slide type sheet material cutting device according to a fourth embodiment of the present invention.

[Explanation of symbols]

 1 Movable Blade 2 Fixed Blade 3 Movable Blade 4 Support Shaft 5 Frame 6 Drive Arm 7 Extension Frame 8 Axis 11 Spacer 12 Screw 21 Worm Wheel 22 Worm Gear 23 Motor 24 Drive Pin 25 Tilt Shaft 26 Handle 31 Motor Case 32 Front Box Plate 33 Side box plate 34 Rear box plate 35 Upper box plate 41 Coil spring 42 Coil spring 51 Movable blade 52 Fixed blade 56 Drive arm 71 Holder member 72 End plate 73 Side plate 74 Upper plate 75 Lower plate 76 Pin 77 Tilting bearing

Claims (6)

[Claims] 1. A fixed blade, a movable blade that cuts a sheet material in cooperation with the fixed blade, a worm wheel that drives the movable blade, and a worm gear that meshes with the worm wheel. The worm gear is rotationally driven. In the sheet material cutting device for cutting the sheet material by sliding the blade edges of the movable blade and the fixed blade into contact with each other, the sheet material is provided with an attaching / detaching means for detachably engaging the worm wheel and the worm gear. Cutting device. 2. The attachment / detachment means comprises a moving mechanism for detachably engaging the worm gear and the worm wheel by moving the worm gear shaft in a direction parallel or perpendicular to the worm wheel shaft. The sheet material cutting device according to claim 1. 3. The attaching / detaching means includes a motor connected to the worm gear, a motor case for holding the motor,
A holder member that holds the motor case movably in parallel or at right angles to the axis of the worm wheel so that the mesh between the worm gear and the worm wheel can be attached and detached, and the motor case can be moved to a position where the worm gear and the worm wheel mesh. The sheet material cutting device according to claim 2, further comprising a biasing unit that biases the sheet material in a direction. 4. The attachment / detachment means includes a tilting mechanism for tiltably supporting the shaft of the worm gear so as to attach / detach the mesh between the worm gear and the worm wheel, and a tilting bias in a direction in which the worm gear and the worm wheel mesh with each other. The sheet material cutting device according to claim 1, further comprising a biasing unit. 5. The sheet material cutting device according to claim 1, wherein the movable blade is a rotary type cutting device which rotates to move the blade edge in sliding contact with the fixed blade edge to cut the sheet material. . 6. The sheet material cutting device according to claim 1, wherein the movable blade is a slide-type cutting device that linearly moves and a blade edge of the movable blade slidably contacts a fixed blade edge to cut a sheet material. .