JPH0929698A - Motor-driven punch unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To punch holes in a thicker material to be perforated with smaller power by engaging the male screw of the body part outer diameter of a hollow cylindrical spindle with the female screw of the inner diameter of a fixed engaging member fixed in a frame and performing perforation by moving a punch provided in the tip of the spindle while moving this punch in an axial direction. SOLUTION: In a motor-driven punch unit installed in a copying machine or the like for creating binding holes by stacking a plurality of copied paper sheets, during a perforating operation, the plurality of stacked paper sheets S are inserted into the perforating position of a guiding part 9 and a driving motor 50 is actuated. Then, a spindle 11 is rotated forward via a gear 22, a male crew 11a provided in its body part outer diameter is engaged with a female screw 21a in the inner diameter of a fixed engaging member 21 and thereby the spindle 11 is moved in a lower axial direction while being rotated. Then, the paper sheets S are perforated by the rotation of the cutting blade of a punch 15 provided in the tip of the spindle 11. When a micro switch 53 is switched ON after the completion of perforation, the motor 50 is rotated backward and the punch 15 is returned to its original position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric punch unit which is built in a copying machine or its peripheral equipment and which automatically punches a binding hole by stacking a plurality of copied sheets.

[0002]

2. Description of the Related Art As a conventional punching machine for punching a binding hole in a paper or the like, a punching machine for punching a cylindrical punch without rotating it (Japanese Patent Laid-Open Nos. 62-173199 and 63-121862). No. 6-18797), and a punching machine for punching by pushing down a cylindrical drilling blade while rotating (Publication No. 59-28799).

Further, in recent years, with the spread and speeding up of copying machines, a punching machine that automatically punches a binding hole after a copying process has been required.
Japanese Unexamined Patent Publication No. 121862 discloses a punching machine provided at a sheet discharge port of a copying machine, and a punching machine disclosed in Japanese Utility Model Laid-Open No. 63-154199 which punches discharged sheets one by one. .

Further, in order to prevent the shavings from being scattered, a piercing machine is disclosed in which a piercing auxiliary body having a protrusion for pushing up the shavings is provided below the die to push the shavings into the hollow portion of a hollow cylindrical punch. (Japanese Utility Model Publication No. 6-18797).

[0005]

However, the above-mentioned JP-A-62-173199 and JP-A-63-1218.
No. 62, JP-B-6-18797 and the like, a punching machine for punching a non-rotating punch by punching it into a material to be punched requires a large pushing force for punching, and a thick material to be punched or a material to be punched. A large amount of power is required to pierce and stack a number of sheets. The punching machine described in Japanese Utility Model Publication No. 59-28799 discloses a punching machine that uses a rotating cylindrical punch to punch a small force, but has different powers for rotating the punch and moving the punch in the axial direction. Therefore, it is difficult to reduce the size of the punching machine. Further, the above-mentioned JP-A-6
In the punching machine for punching the sheets one by one described in JP-A-3-121862 or Japanese Utility Model Laid-Open No. 63-154199, the punched sheets must be aligned after punching. At this time, the sheets are aligned with reference to the punched holes. However, if the edges of the paper are aligned with respect to each other, the positions of the punched holes do not match, and the holes are not aligned.

Further, as a method for treating perforated scraps, a perforator having a perforated scrap treatment means disclosed in Japanese Utility Model Publication No. 6-18797 pushes and punches with a non-rotating punch.
In order to reduce the pushing load during punching, there is a problem that a complicated mechanism is required to raise the projecting portion after punching without supporting the portion to be punched by the projecting portion of the punching aid during punching. .

In order to solve the above problems, the present invention provides
To provide an electric punch unit capable of automatically punching multiple stacked sheets of paper at the same position without shifting the binding holes with a small pushing force, and with a simple structure to prevent scattering of punching chips. To aim.

[0008]

In order to achieve the above object, an electric punch unit of the present invention comprises a punch having a cylindrical cutting edge and a die provided at a position facing the punch. In an electric punch unit that moves in the axial direction while rotating the punch and penetrates the material to be punched inserted between the punch and the die to punch the punch, the punch is provided at the tip. A hollow cylindrical spindle having a spiral protrusion on the outer diameter of the body, and a cylindrical hole having an inner diameter of a spiral groove that engages with the spiral protrusion of the spindle. A fixed engaging member or a rotary engaging member for rotatably and axially movably supporting the spindle, and a protrusion of the spindle and a spiral groove of the fixed engaging member or the rotary engaging member are engaged with each other. Rotate and axially rotate the spindle It is obtained by a drive means that reciprocates the.

Further, in order to achieve the above object, the electric punch unit of the present invention comprises a frame provided with a guide portion for inserting a material to be punched and a die facing the punch, and the frame is fixed to the frame. The engaging member is fixed, and the spindle is axially movably supported in the cylindrical hole of the fixed engaging member so as to be rotatable and movable in the axial direction. Drive means is provided for rotating the spindle forward and backward to axially move the spindle so that the punch is inserted and removed.

In order to achieve the above object, another electric punch unit of the present invention comprises a frame provided with a guide portion for inserting a material to be punched and a die facing the punch, and the frame is provided in the frame. The rotary engaging member is rotatably rotatably supported, and a cylindrical hole having an inner diameter of a spiral groove that engages with a spiral protrusion of the spindle is provided at the center of the rotary engaging member. The spindle and the spindle are rotatably and axially movably supported so that the axis of the spindle is perpendicular to the guide portion, and the punched material is inserted into and removed from the material to be drilled inserted in the guide portion while rotating. The rotary engaging member is provided with drive means for rotating the rotary engaging member at a speed higher than the rotary speed of the rotary engaging member simultaneously and in the same direction in the forward and reverse directions, and differentially moving the spindle in the axial direction. .

Further, the die of the electric punch unit of the present invention forms a cored cylindrical ring-shaped groove, and the inner diameter of the outer circle of the ring-shaped groove is larger than the outer diameter of the cylindrical cutting edge of the punch. Slightly larger, the outer diameter of the core forming the inner circle of the groove is slightly smaller than the inner diameter of the cylindrical cutting edge of the punch, and the tip of the core has a slope or a spherical surface. Desirable for easy discharge.

Further, the electric punch unit of the present invention is
From the position of the top dead center of the standby position where the cutting edge of the punch is above the material to be drilled, to the position of the bottom dead center where the cutting edge has entered the ring-shaped groove slightly below the surface of the die, the spindle is It is desirable for quick and automatic drilling to include control means for controlling the drive means to reciprocate in the axial direction. Further, the spiral groove of the fixed engagement member or the rotary engagement member is formed by a female screw, and the protrusion portion of the outer diameter of the body portion of the spindle is formed by a male screw screwed into the female screw. Is desirable because it can be easily manufactured, or
The outer diameter of the body of the spindle is provided with a spiral groove, or one or two or more recesses arranged in a spiral shape, and the groove or recess is provided with a spiral groove having an inner diameter of the fixed engagement member or the rotary engagement member. By disposing one or more rolling members to be engaged, friction of engagement can be reduced.

Further, in the electric punch unit of the present invention,
Since the pressing member elastically attached to the spindle so as to move in the axial direction with the movement of the spindle is provided with the pressing means for pressing the material to be punched at the time of punching, it is possible to prevent the deviation of the material to be punched at the time of punching In the case of piercing, it is preferable because the piercing can be performed neatly. Further, the pressing member is a holding member that moves in the axial direction together with the movement of the spindle without rotating, and a member to be pierced that is supported by the holding member and guides the material to be pierced during piercing A pressing member for pressing against the surface, a supporting means for supporting the pressing member on the holding member so that the lower surface thereof is located below the tip of the cutting edge of the punch by a predetermined dimension when the pressing member is on standby, and is movable in the axial direction; A more reliable pressing effect can be expected by providing between the member and the pressing member a biasing means for pressing the material to be punched by the pressing member.

[0014]

In the electric punch unit according to the present invention, the protrusion having the outer diameter of the body portion of the spindle is fitted into the cylindrical hole having the spiral groove of the fixed engaging member fixed to the frame, and is inserted. Since a punch is provided at the tip of the spindle,
When the spindle is rotated by the driving means, the protrusion of the spindle engages with the spiral groove and moves in the axial direction, and the punch at its tip moves downward from the standby position at the top dead center while rotating. As a result, the punch penetrates the material to be drilled while rotating, and while punching the material to be drilled, moves to the position of the die provided on the opposing guide surface to complete the drilling. Since the electric punch unit of the present invention is provided with the upper and lower limit switches that are means for controlling the axial movement of the spindle, the lower limit switch causes a dead point when the tip of the cutting edge of the punch slightly enters from the upper surface of the die. Detected, the drive means stops and reverses the spindle in response to the signal, and the punch is removed from the material to be punched and lifted to the original standby position at the top dead center. When reaching the top dead center, the upper limit switch detects and stops the driving means. That is, by rotating the spindle forward and backward by one driving means, the punch can be rotated and moved in the axial direction at the same time, so that the device can be downsized and the punch can be rotated and pushed into the material to be punched while cutting. Since the punching can be performed with a small pushing force, the power of the driving means can be small.

Further, the engaging member having a spiral groove in the cylindrical hole is not fixed to the frame, but is made a rotary engaging member rotatably supported by the frame. By rotating the hollow cylindrical spindle fitted in the hole in the same direction at the same time and setting the rotational speed of the rotary engaging member to a rotational speed lower than the rotational speed of the spindle, the spindle has only the difference between the two speeds. Move in the axial direction. Therefore, when the engaging member is rotated,
As compared with the case where the engaging member is fixed, the punch penetrates and punches the material to be punched while rotating more for the same amount of movement in the axial direction. As a result, since the number of cuts by the cutting edge of the punch is increased, the punching can be performed with a smaller pushing force, the power of the driving means can be smaller, and more beautiful punching can be performed.

Further, the die facing the punch has a cylindrical ring-shaped groove having a core, and the cutting edge of the punch penetrates into the ring-shaped groove after penetrating the material to be perforated. The shavings that can be formed are sequentially pushed into the cylindrical portion of the punch by this core, and are discharged from the upper portion of the spindle through the cylindrical portion of the punch and the hollow portion of the spindle. Therefore, drilling dust is scattered on the guide portion of the material to be drilled,
It is possible to prevent the next hole from being hampered, or prevent the device from malfunctioning by being attached to a peripheral device such as a sensor. In the punching machine of the present invention, since the punch for punching by pushing while rotating the cutting edge is used, it is possible to use a die having a fixed core without increasing the load during punching,
It does not require a complicated mechanism such as the movement of the boring auxiliary body unlike the boring machine described in Japanese Utility Model Publication No. 6-18797.
In addition, since the tip of the core is sloped or spherical, punching waste is transformed into a dish and the outer diameter becomes smaller, and there is less resistance when passing through the cylindrical part of the punch and the hollow part of the spindle, making it easier to discharge. become.

Further, the spiral groove of the fixed engagement member or the rotary engagement member is used as an internal thread, and the protrusion of the outer diameter of the body portion of the spindle is also used as an external thread to be screwed into the internal thread of the spindle. Rotation and axial movement can be performed by one drive, or a spiral groove, or one or two or more dents arranged in a spiral shape, is provided on the outer diameter of the spindle body, and rolling is performed in this groove or dent. The same function as described above can be achieved by disposing a member and engaging it with the spiral groove having the inner diameter of the fixed engagement member or the rotary engagement member.

Further, the electric punch unit of the present invention is provided with the pressing means for pressing the material to be punched at the time of punching, so that the material to be punched is prevented from being displaced by the rotation of the punch at the time of punching and the deviation of the material to be punched is prevented. It is possible, and even when a large number of holes are drilled, it can be drilled cleanly. A pressing member supported by a holding member that moves in the axial direction together with the movement of the spindle without rotating the pressing means, and presses the material to be perforated during perforation;
By providing an urging means for urging the material to be punched by this pressing member, the pressing member continues to push the material to be punched until the punching is completed from the beginning of the punching and the punch is removed from the material to be punched. . At the standby position, the tip of the cutting blade of the punch is located above the lower surface of the pressing member by a predetermined dimension, so even if the punch descends and the lower surface of the pressing member begins to press the perforated material, the cutting blade will still be the perforated material. The punching is started after the pressure member presses and biases the material to be drilled by the biasing force of the biasing means without contacting the. Therefore, the material to be punched does not follow the rotation of the punch at the beginning of punching. Further, since the pressing member is supported by the holding member so as to be movable in the axial direction by the supporting means, the punch can be further lowered even if the pressing member comes into contact with the material to be punched. That is, while the pressing member presses the material to be perforated by the urging means, the punch descends and perforates, and the pressing member continues to press the material to be perforated until completion of perforation and removal from the material to be perforated. As a result, the perforated material is not disturbed, and it is possible to perforate finely even a large number of stacked papers.

[0019]

The present invention will be described in detail below with reference to the illustrated embodiments. 1 is a side sectional view of an electric punch unit of a first embodiment of the present invention, FIG. 2 is a side sectional view of an electric punch unit of a second embodiment of the present invention, and FIG. 3 is an electric punch unit of the first embodiment of the present invention. FIG. 4 is a front view of the punch unit, FIG. 4 is an enlarged sectional view of the punch and die of the electric punch unit according to the embodiment of the present invention, and FIG. 5 is a sectional view showing the state of the pressing member at the top dead center of the punch standby position. FIG. 7 is a cross-sectional view showing a state of the pressing member during punching, and FIG. 7 is a view showing a method of engaging the bearing member and the spindle of the electric punch unit of the third embodiment of the present invention.

In the first embodiment shown in FIGS. 1 and 3, the frame 1 is formed in a box shape by an upper member 2, a lower member 3 and left and right side members 4. The lower member 3 has a spindle 1
1 is provided with a through hole 3a, a guide plate 5 is fixed to the lower side of the lower member 3 in parallel with the lower member 3, and between the bottom surface of the lower member 3 and the guide surface 5a of the guide plate 5. A guide portion 9 into which the material S to be drilled is inserted is formed. A part of the lower member 3 is extended to form a mounting member 6, and the drive motor 50 is fixedly installed. A guide member 7 is fixed to the side member 4 in the vicinity of the upper portion of the lower member 3, and a guide 8 for slidingly and rotatably sliding vertically on the guide surface 5a is fixed by inserting the outer diameter of the spindle 11 into the guide member 7. Has been done. On the lower surface of the upper member 2, a fixed engagement member 21 having an inner diameter and an internal thread 21a rotatably screwed into an external thread 11a provided on the outer diameter of the body of the spindle 11 is fixed coaxially with the guide 8. Has been done.

The spindle 11 has a hollow cylindrical shape, and is provided with a screw 11a on the outer diameter of the upper body portion. The male screw 11a is screwed onto the female screw 21a so that the fixed engaging member 2
1, the spindle 11 is adapted to rotate and move in the axial direction. The lower outer diameter of the spindle 11 is slidably and rotatably held by the guide 8. The inner diameter of the lower end of the spindle 11 in FIG. 1 is provided with a taper 11b as shown in detail in FIG. 4, and is fitted with the taper shank 15a of the punch 15 to fix the punch 15. The inner diameter of the hollow part of the spindle 11 is equal to that of the punch 15
If the inner diameter of the punch 15 is slightly larger than the inner diameter of the punch 11, the punch 15 can be easily pulled out when it is removed from the spindle 11, and punching chips, which will be described later, can easily pass through.

The punch 15 has a thin-walled cylindrical shape in which a cylindrical cutting edge 15b having an outer diameter substantially equal to the diameter of the hole to be drilled is provided at the tip, and a taper shank 15a is provided at the other end. It is designed to discharge Sc. Then, as described above, the taper shank 15a is fitted to the taper 11b of the spindle 11 and is fixed coaxially. Due to the movement of the spindle 11 in the axial direction, the cutting edge 15b of the punch 15 is located slightly above the lower surface of the lower member 3 (1-2 mm) at the standby position at the top dead center, and at the bottom dead center from the surface of the die 31. It is set so that it will enter the ring groove slightly below. Although the spindle 11 and the punch 15 are divided in this embodiment, they may be integrated.

As shown in detail in FIG. 4, the die 31 comprises a ring portion 32 and a core 33. The ring portion 32 has a ring shape whose inner diameter is slightly larger than the outer diameter of the spindle 11, and is embedded in the guide plate 5 at a position facing the punch 15 coaxially with the punch 15 so as to be flush with the guide surface 5a. It is fitted. The core 33 has a stepped button shape, and is fitted to the inner diameter of the ring portion 32 by the large diameter portion 33a so that the upper end surface of the small diameter portion 33b is flush with the guide surface 5a or slightly below. A die having a ring groove shape is formed between the outer diameter of the small diameter portion 33b and the outer diameter of the small diameter portion 33b. Further, the tip of the small diameter portion 33b has a slope 33 so that the drilling chips can be easily discharged.
c is provided. The slope 33c at the tip may be spherical. Further, the die 31 may be manufactured by integrally forming the ring portion 32 and the core 33, or may be manufactured by integrally forming the ring portion 32 and the guide plate 5.

A gear 22 is fixed to the outer diameter of the central portion of the spindle 11, and the gear 22 meshes with a pinion 23 fixed to a shaft 51 of a drive motor 50 fixedly mounted on the mounting member 6 so that the spindle 11 can be rotated normally and reversely. It is designed to rotate. The upper member 2 and the lower member 3 respectively include a spindle 1
The upper microswitch 52 and the lower microswitch 5 serve as control means for controlling the top and bottom dead centers of the axial movement of the first microswitch 5.
3, the upper microswitch 52 detects the upper surface of the gear wheel 22 so that the cutting edge 15b of the punch 15 stops the drive motor 50 at a standby position slightly above the lower surface of the lower member 3 at the top dead center. Operate. Lower micro switch 53
Detects the lower surface of the gear 22 and causes the cutting edge 15b to move to the die 31
After the drive motor 50 is stopped at the bottom dead center where the hole is slightly penetrated into the ring groove to complete the punching, the punch 1 is rotated in the reverse direction.
5 is pulled out from the material to be drilled.

Although not shown in FIG. 1, the electric punch unit of the present invention can be provided with a pressing means 40 for the perforated material shown in FIGS. 6 and 7. The pressing means will be described below with reference to FIGS. FIG. 5 is a view showing the state of the pressing means at the standby position, and FIG. 6 is a diagram showing the state of the pressing means at the position where the punching is completed. The pressing means 40 includes a holding member 41,
It comprises a pressing member 45 for pressing the material to be perforated, a support rod 42 (supporting means), and a coil spring 43 (biasing means). The holding member 41 is in the form of an elongated plate having a through hole 41a through which the spindle 11 is inserted at substantially the center thereof. The spindle 11 is inserted through the through hole 41a and is disposed on the lower surface of the gear 22. It is rotatably held on the spindle 11 by being sandwiched by the boss 22 a of the gear 22 and the snap ring 48 fitted in the circumferential groove of the spindle 11 via the upper spacer 46 and the lower spacer 47. The holding member 41 is constrained from rotating by a guide (not shown) fixed to the frame 1. As a result, when the spindle 11 rotates and moves in the axial direction, the holding member 41 moves in the axial direction together with the spindle 11 without rotating.

The pressing member 45 is in the form of an elongated plate having a through hole 45a through which the spindle 11 is inserted, and has two headed support rods (supporting means) 42 on its upper surface.
Has been planted. The support bar (supporting means) 42 is inserted into two holes provided in the holding member 41, and the pressing member 45 is suspended from the holding member 41. The lower member 3 has a window 3a that is slightly larger than the outer shape of the pressing member 45. When the spindle 11 shown in FIG. 5 is at the top dead center of the standby position, the pressing member 45 is flush with the lower member 3 in the window 3a. Is located. At this standby position, the cutting edge 15b of the punch 15 is set to be located slightly above (1 to 2 mm) the pressing surface of the pressing member 45 in the through hole 45a. A coil spring (biasing means) 4 for applying a tension between the holding member 41 and the pressing member 45 to the support rod (support means) 4
3 is fitted.

Next, the operation of the electric punch unit of the first embodiment provided with the above-mentioned pressing means will be described separately for the punching operation and the pressing means operation. First, when a material S to be perforated, such as a stack of a plurality of sheets, is inserted into the perforation position of the guide portion 9 and the drive motor 50 is started, the gear 22 is driven by the pinion 23 and the spindle 11 rotates forward. Spindle 11
When is rotated, the male screw 11a provided on the outer diameter of the body portion engages with the female screw 21a having the inner diameter of the fixed engagement member 21, and the spindle 11 moves while rotating in the downward axial direction. Then, the cutting edge 15b of the punch 15 provided at the tip of the spindle 11 starts rotating and starts punching the material S to be punched.
When the perforation progresses, the cutting edge 15b of the punch 15 completely penetrates the material S to be perforated and the perforation is completed.
5 further descends, and the cutting edge 15b enters the ring groove to a bottom dead center slightly below the surface of the die 31 as shown in FIGS.

Here, since the die 31 forms a ring groove having the core 33, the punching dust Sc formed on the inner diameter portion of the punch 15 has a small diameter portion 33b of the core 33 of the die 31 as shown in FIG. Is sequentially pushed up by the tip of the spindle 11, passes through the hollow portion of the spindle 11, and is discharged from the upper portion of the spindle 11. Therefore, it is possible to prevent the drill scraps from being scattered on the guide portion 5 and obstructing the drilling at the next drilling, or from adhering to the sensor of the peripheral device or the like to cause the unit to malfunction. Further, since the tip of the small diameter portion 33b is formed into a slope 33c or a spherical shape, the punch scrap Sc is deformed into a dish shape as shown in the figure and its diameter becomes smaller, and passes through the inner diameter of the punch 15 and the hollow portion of the spindle 11. The resistance at the time of drilling is reduced, and the drilling chips are easily discharged.

When the punch 15 is completed and the punch 15 descends to the bottom dead center, the lower micro switch 53 detects the lower surface of the gear 22 and stops the drive motor 50 by the signal, and then reverses it. As a result, the male screw 11a of the spindle 11 engages with the female screw 21a of the inner diameter of the support member 21 and moves upward while rotating the punch 15, and the punch 1
5 is extracted from the material to be perforated and rises. When the punch 15 moves up to the top dead center, the upper micro switch 52 detects the upper surface of the gear wheel 22 and the drive motor 5 detects the signal.
0 is stopped to enter the standby state.

Next, the operation of the pressing means 40 at the time of punching will be described with reference to FIGS. Drive motor 5
When the spindle 11 is driven by 0 and moves downward from the standby position while rotating forward, the spindle supported by the lower spacer 47 and the snap ring 48 while the holding member 41 suspends the pressing member 45 by the support rod 42. Move downward with 11. Since the holding member 41 is restrained from rotating by a guide (not shown), it does not rotate even if the spindle 11 rotates, and moves downward until the pressing member 45 hits the perforated material S as shown in FIG. When the pressing member 45 descends and hits the perforated material S, the pressing member 4
5 stops descending, but at this point the cutting edge 1 of the punch 15
Since 5b is slightly above the pressing surface of the pressing member 45, the punching is not started yet. When the spindle 11 further moves downward while further rotating, the holding member 41 is pushed down via the lower surface of the boss 22a of the gear 22 fixed to the spindle 11 and the upper spacer 46 to compress the coil spring 43 and press the pushing member 45. Is pressed against the perforated material S. Then, after the pressing member 45 presses the material S to be perforated, the cutting blade 15a bites into the material S to be perforated while being pressed and perforated while being pressed. Therefore, the material to be perforated is not rotated by the rotation of the cutting blade 15a at the beginning of perforation, and it is possible to perforate neatly even a large number of stacked papers. On the other hand, even if the movement of the pressing member 45 is stopped, the support rod 42 is held in the hole of the holding member 41 so as to be movable in the axial direction, so that the holding member 4 is held.
1 can move downward while compressing the coil spring 43.

When the spindle 11 reaches the bottom dead center and the punching is completed, the driving motor 50 is stopped / reversely rotated and the punch 15 is raised, the support member 41 is also raised, but the cutting edge 15b leaves the material S to be punched. Until then, the pressing member 45 continues to press the perforated material S by the spring force of the coil spring 43. Cutting edge 15
When the spindle 11 further rises after b leaves the material S to be perforated, the head of the support rod 42 is locked by the support member and lifts the pressing member 45, and the pressing member 45 is top-dead on the same surface as the lower member 3. The drive motor 50 stops after returning to the standby position of the point. That is, the pressing member 45 continues to press the perforated material S from the time when the cutting blade 15b bites into the perforated material S to start the perforation until the perforation is completed and withdrawn, so that the perforated material is It is possible to cleanly perforate even a large number of stacked papers without disturbing.

FIG. 2 shows a side sectional view of a second embodiment of the electric punch of the present invention. In the first embodiment, as shown in FIG. 1, the fixed engaging member 21 provided with the female screw 21a is attached to the upper member 2
Although only the spindle 11 provided with the male screw 11a was rotated, in the second embodiment, as shown in FIG. 2, the spindle 11 was rotated at the same time as the female screw 21a side as shown in FIG. The engagement member is also different in that it is rotated as the rotary engagement member 26. Hereinafter, this will be described in more detail. As shown in FIG. 2, the disc-shaped rotary engaging member 26 is
The boss 26a is inserted into the through hole 2a of the upper member 2, and upper and lower surfaces are formed by the upper surface of the rotary engagement member 26 and the snap ring 29 inserted into the circumferential groove 26b on the outer periphery of the boss 26a via the spacers 27 and 28. It is rotatably supported by the upper member 2 with the pinch in between. A gear 26c having a larger diameter than the gear 22 is provided on the outer diameter of the rotary engaging member 26, and the gear 26c meshes with a pinion 25 fixed to a shaft 51 of a motor 50 to rotate the rotary engaging member 26. It is like this. Further, a female screw 21a similar to the fixed engaging member 21 of FIG. 1 is provided in the central cylindrical hole of the rotary engaging member 26, and the male screw 11a of the outer diameter of the body portion of the spindle 11 is rotatably engaged. There is. A gear 22 is fixed to the outer diameter of the spindle 11 as in the case of FIG. 1, and is rotated by a motor 50 via a pinion 23. The pinion 25 has a smaller diameter than the pinion 23 and is fixed coaxially with the shaft 51 of the motor 50. When the motor 50 rotates, the rotary engaging member 26 and the spindle 11 simultaneously rotate in the same direction, but the rotary engaging member 26 rotates. The rotation speed is lower than the rotation speed of the spindle 11.

The operation of the electric punch unit of the second embodiment will be described below. When the motor 50 is started for drilling, the pinions 23 and 25 fixed to the coaxial shaft 51 rotate to drive the gears 22 and 26c meshing therewith. Then, similarly to the first embodiment, the spindle 11 rotates, and in the spindle 11, the male screw 11a provided on the outer diameter of the body portion is engaged with the female screw 21a of the inner diameter of the rotary engaging member 26 in the downward axial direction. The cutting edge 15b of the punch 15 provided at the tip of the punch 15 penetrates the workpiece S while rotating. However, since the rotary engaging member 26 is also rotated in the same direction by the gear 26c simultaneously with the rotation of the spindle 11, the spindle 11 is moved downward by the rotation pitch amount of the spindle 11 as in the first embodiment in which the female screw 21a is fixed. Does not move. That is, the rotary engaging member 26 only rotates and does not move up and down, and the gear 22 rotates and moves up and down. Therefore, the space between the rotary engaging member 26 and the gear 22 separates, and the spindle 11 moves downward. The way you move. Therefore, in the second embodiment, since the rotary engaging member 26 provided with the internal thread 21a rotates at a speed lower than the rotational speed of the spindle 11, the rotary engaging member 2
The spindle 11 moves in the axial direction by a screw pitch corresponding to the differential rotation of the spindle 6 and the spindle 11. For example,
When the pitch of the screws 11a is P = 1 mm, the spindle 11 moves in the axial direction by 1 mm in one rotation in the first embodiment. On the other hand, in the second embodiment, when the rotation ratio of the gear 22 and the gear 26c is set to 10: 8, for example, the spindle 11 moves only 0.2 mm in one rotation. Therefore, if the thickness of the material to be perforated is 5 mm, in the first embodiment, the cutting edge 11b of the punch 15 rotates 5 times from the start to the completion of perforation. On the other hand, in the second embodiment, the cutting edge 11b rotates 25 times. That is, in the second embodiment, since the cutting edge 15b of the punch 15 rotates while rotating more times than in the first embodiment, it is possible to perform more beautiful punching with a small pushing force. Although omitted in FIG. 2, a pressing means similar to that of the first embodiment can be provided in the second embodiment.

FIG. 7 is a diagram showing a third embodiment of an engaging method of a spiral groove having an inner diameter of a fixed engaging member or a rotary engaging member and a spindle engaging with the groove. In the first and second embodiments, a screw is used as an engagement method between the fixed engaging member or the rotary engaging member and the spindle, but in the third embodiment shown in FIG. 7, the fixed engaging member or the rotary engaging member is used. A spiral groove 21d is provided on the inner diameter of the member, and a ball 17 inserted into a recess 11d provided on the outer diameter of the body of the spindle 11 is engaged as a rolling member. As a result, the spindle 11
When the ball 17 is rotated in the spiral groove 21d,
Moves by rolling, and the spindle 11 moves up and down in the axial direction. Further, the recess 11d may be a plurality of recesses arranged in a spiral shape instead of one, or a spiral groove may be provided on the outer diameter of the body of the spindle 11 and a plurality of balls may be arranged in this groove. May be. The engagement method of the third embodiment has an advantage that the frictional resistance is smaller than that by the screw, and therefore the drilling can be performed with less power. Further, as the rolling member, a cylinder having the groove width of the groove 21d may be embedded in the outer periphery of the spindle 11 instead of the ball.

As the drive motor 50, a pulse motor, a stepping motor or an AC motor may be used in addition to the DC motor. Further, although the gear is used as the drive medium, it may be a belt or a chain, or may be driven by a coupling. Further, although the microswitches 52 and 53 are used as the means for controlling the position of the spindle, other mechanical type may be used, or a type using an encoder and an optical sensor or a magnetic type may be used. Although the coil spring is used as the biasing means, rubber may be used.

As described above, according to the electric punch unit of the embodiment of the present invention, the male thread of the outer diameter of the body of the hollow cylindrical spindle is replaced with the female thread of the fixed engaging member fixed to the frame. Since the punch provided at the tip of the spindle is screwed to move in the axial direction while rotating and punches, a thicker workpiece is punched compared to a punching machine that punches only by pushing in the axial direction without rotating the punch. The drilling material can be drilled cleanly with less power. Further, in place of the fixed engagement member that is fixed, the inner diameter female screw of the rotating engagement member is screwed onto the male screw of the spindle, and the spindle and the rotation engagement member are differentially rotated, so that the same axial direction is achieved. It is possible to penetrate the material to be perforated while rotating the cutting edge of the punch more with respect to the movement amount, and perforation can be performed with a smaller power.

Since the die has a cored ring groove type and the tip of the core has a slope or a spherical surface,
The tip of this core deforms the punched dust after punching into a dish shape, pushes it into the cylindrical part of the punch and the hollow part of the spindle, and discharges it from the upper part of the spindle. Has little resistance.

Further, by providing the pressing means for pressing the material to be punched at the time of punching, the material to be punched can be prevented from being displaced without rotating along with the rotation direction of the punch at the time of punching.
Even if a large number of holes are drilled, they can be drilled cleanly.

[0039]

According to the electric punch unit of the present invention,
Even in a punch unit for a copying machine, it is possible to easily punch a plurality of stacked sheets of paper with a small amount of power, and it does not take time and trouble to align the sheets after punching.

[Brief description of drawings]

FIG. 1 is a side sectional view of an electric punch unit according to a first embodiment of the present invention.

FIG. 2 is a side sectional view of an electric punch unit according to a second embodiment of the present invention.

FIG. 3 is a front view of the electric punch unit according to the first embodiment of the present invention.

FIG. 4 is an enlarged sectional view of a punch and a die of the electric punch unit according to the embodiment of the present invention.

FIG. 5 is a sectional view of the pressing means of the electric punch unit according to the embodiment of the present invention in a standby state.

FIG. 6 is a cross-sectional view of the pressing means of the electric punch unit according to the embodiment of the present invention when the punching is completed.

FIG. 7 is a diagram showing a method for engaging a fixed engagement member or a rotary engagement member of an electric punch unit with a spindle according to a third embodiment of the present invention.

[Explanation of symbols]

 1 frame 2 upper member 3 lower member 4 side member 5 guide plate 5a guide surface 6 mounting member 7 guide member 8 guide 9 guide portion 11 spindle 11a male screw (projection portion) 15 punch 15a cutting edge 17 ball (rolling member) 21 Fixed engagement member 21a Female screw (spiral groove) 22 Gear 23 Pinion 25 Pinion 26 Rotation engagement member 26a Boss 26c Gear 27 Spacer 28 Spacer 29 Snap ring 31 Die 32 Ring part 33 Core 40 Pressing means 41 Holding member 42 Support rod (Supporting Means) 43 Coil Spring (Biasing Means) 45 Pressing Member 46 Upper Spacer 47 Lower Spacer 48 Snap Ring 50 Drive Motor (Drive Means) 51 Shaft 52 Upper Micro Switch (Control Means) 53 Lower Micro Switch (Control Means) S Perforated material Sc Perforated waste

Claims (9)

[Claims] 1. A punch having a cylindrical cutting edge and a die provided at a position facing the punch, the axially moving while rotating the punch to move the cutting edge to the punch. An electric punch unit for penetrating and punching a material to be punched inserted between a hollow cylindrical spindle having the punch at the tip and a spiral projection on the outer diameter of the body, and the spindle. A fixed engagement member or a rotation engagement member which has a cylindrical hole having an inner diameter of a spiral groove that engages with the spiral protrusion of, and which rotatably and axially movably supports the spindle in the cylindrical hole, An electric motor comprising: a drive unit that engages the protrusion of the spindle with the spiral groove of the fixed engagement member or the rotary engagement member to rotate and reciprocate the spindle in the axial direction. Punch unit. 2. A frame provided with a guide portion for inserting a material to be punched and a die facing the punch, wherein the fixed engaging member is fixed to the frame, and the cylindrical hole of the fixed engaging member is provided. The spindle is rotatably and axially movably supported with the axis of the spindle perpendicular to the guide portion, and the spindle is directly inserted so that the punched material is inserted into and removed from the material to be drilled inserted in the guide portion while rotating. The electric punch unit according to claim 1, further comprising a driving unit that rotates in the reverse direction to move in the axial direction. 3. A frame provided with a guide part for inserting a material to be punched and a die opposed to the punch, wherein the rotary engaging member is rotatably supported by the frame, A cylindrical hole having an inner diameter of a spiral groove that engages with the spiral protrusion of the spindle is provided in the center, and the axis of the spindle is perpendicular to the guide portion in the cylindrical hole and is rotatable and movable in the axial direction. The spindle and the rotary engaging member so that the rotational speed of the spindle is greater than the rotational speed of the rotary engaging member so that the punch can be inserted into and removed from the material to be drilled inserted into the guide portion while rotating. The electric punch unit according to claim 1, further comprising a driving unit that is enlarged to rotate in the same direction and in the same direction in the forward and reverse directions, and differentially moves the spindle in the axial direction. 4. The die forms a cored cylindrical ring-shaped groove, the inner diameter of the outer circle of the ring-shaped groove being slightly larger than the outer diameter of the cylindrical cutting edge of the punch, and the inner circle of the groove. The outer diameter of the core forming the punch is slightly smaller than the inner diameter of the cylindrical cutting edge of the punch, and the tip of the core has a slope or a spherical surface. Electric punch unit. 5. The bottom edge of the punch when the cutting edge of the punch enters the ring-shaped groove slightly below the surface of the die from the position of the top dead center of the standby position above the material to be punched. 5. The electric punch unit according to claim 1, further comprising control means for controlling the driving means so that the spindle reciprocates in the axial direction up to a position. 6. The spiral groove of the fixed engagement member or the rotary engagement member is formed by an internal thread, and the protrusion of the outer diameter of the body of the spindle is formed by an external thread screwed into the internal thread. The electric punch unit according to any one of claims 1 to 5, which is configured. 7. A spiral groove or one or two or more dents arranged in a spiral shape are provided on the outer diameter of the body of the spindle,
6. One or two or more rolling members that engage with a spiral groove having an inner diameter of the fixed engagement member or the rotary engagement member are arranged in the groove or the depression. The electric punch unit described in Crab. 8. The pressing member elastically attached to the spindle so as to move in the axial direction along with the movement of the spindle comprises pressing means for pressing the material to be punched during punching. The electric punch unit according to any one. 9. The pressing means comprises: a holding member that does not rotate and moves in the axial direction with the movement of the spindle; and a pressing member that is supported by the holding member and presses a perforated material against the guide surface during perforation. Provided between the holding member and the pressing member, and a support means for supporting the pressing member on the holding member such that the lower surface thereof is positioned below the tip of the cutting edge of the punch by a predetermined dimension and is movable in the axial direction during standby. The electric punch unit according to any one of claims 1 to 8, further comprising a biasing unit that biases the punched material by the pressing member.