JPH1177593A - Punch device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form plural punch holes at accurate positions. SOLUTION: Plural punch blades P1, P2, P3, and P4 are driven by cams C1, C2, C3, and C4. The cams C1 to C4 are installed to a cam shaft 42 by changing the installing angles, and the cam shaft 42 is to be driven to rotate by a motor 41. When the cam shaft 42 is rotated, the plural punch blades P1 to P4 operate in the different phases. In this case, in the condition where one punch blade has finished punching, and is penetrating a sheet body, the next punching work of the punch is started. Consequently, since the next punching by the next punch blade is performed in the condition to position the sheet body by the punch blade which has made the punching already, the punching hole can be formed at an accurate position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a sheet such as an aluminum plate, particularly a photosensitive sheet (hereinafter referred to as "sensitive material") having a punch hole (including an opening or a notch). The present invention relates to a punch device for punching.

[0002]

2. Description of the Related Art Conventionally, an image output apparatus for exposing a photosensitive material to record a latent image has been used to prepare a printing plate. The photosensitive material on which the image has been recorded is then subjected to a development process for visualizing the latent image. The photosensitive material includes a resin printing plate with a photosensitive material layer supported on a resin film,
An aluminum printing plate having a photosensitive material layer carried on an aluminum sheet is used.

[0003] For alignment in the printing process, the image output device is provided with a punch device for punching a punch hole at a position corresponding to the image output position. By inserting the positioning pins into the punch holes, the photosensitive material can be aligned, and the printing process can be performed satisfactorily. For accurate alignment, it is necessary to drill at least two punch holes. for that reason,
The punch device includes at least two punch blades and a motor for driving these punch blades. When the vicinity of the end of the photosensitive material after image recording is conveyed to the punch device, the motor is driven, and a plurality of punch blades are operated at the same time to punch holes at the same time.

[0004]

However, when a plurality of punch blades are simultaneously brought into contact with the surface of the light-sensitive material, stress is applied to the light-sensitive material, causing deformation of the light-sensitive material. Due to this deformation, there is a possibility that the punching position of the punch hole is out of order,
The positioning in the printing process may be hindered.

[0005] Further, if a plurality of punch holes are to be punched at once in a photosensitive material requiring a large punching force, such as an aluminum printing plate, it is necessary to use a plurality of motors. For this reason, there has been a problem that an increase in cost cannot be avoided and it is difficult to secure a mounting space for the motor.
Although it is conceivable to use a single motor with a large output torque, it is unavoidable that the cost is increased, and if the number of punch blades is changed, the motor must be replaced according to the required torque. Not a preferred solution.

Accordingly, a first object of the present invention is to provide a punch device capable of punching a plurality of punch holes at accurate positions on a sheet member. A second object of the present invention is to provide a punch device capable of punching a sheet requiring a large punching force without complicating the configuration. Further, a third object of the present invention is to provide a punch device capable of accurately punching a plurality of punch holes with a simple configuration.

[0007]

According to a first aspect of the present invention, there is provided a punching apparatus for punching a plurality of punched holes in a sheet body, wherein the sheet body to be punched is provided. A plurality of punch blades provided so as to be able to reciprocate along a direction substantially perpendicular to the other, and at least two punch blades among the plurality of punch blades penetrate the sheet body and the other one is A punch apparatus comprising: a punch blade driving mechanism that drives the plurality of punch blades by changing the operation phases of the two punch blades so as to start punching of the sheet body.

According to this configuration, since one punch blade penetrates the sheet member and the other punch blade performs the punching operation while the sheet member is positioned, the punch hole is punched at an accurate position. Can be. Preferably, the punch blade driving mechanism drives the plurality of punch blades in different phases. In this configuration, since two punch blades do not perform the punching operation at the same time, the punching of the sheet body requiring a large punching force can be performed, for example, by using a rotary drive source having a relatively small output torque (for example, the punching by one punch blade). Which generates torque necessary and sufficient for operation). Therefore, a plurality of punch holes can be punched in a sheet requiring a large punching force without complicating the configuration.

Further, since the required driving force is small, the load on the driving force transmission system is reduced. Thereby, the punching position accuracy of the punch holes can be further improved, and the durability of the device can be improved. Further, since the two punch blades do not perform the punching operation at the same time, there is no possibility that a large stress acts on the sheet member. Thus, since a plurality of punch holes can be formed without significantly deforming the sheet body, the plurality of punch holes can be formed at accurate positions.

According to a second aspect of the present invention, the punch blade drive mechanism includes a plurality of punch blades for moving the plurality of punch blades in a direction substantially perpendicular to a sheet to be punched. The punch apparatus according to claim 1, further comprising a plurality of cams provided so as to be able to engage with each other, and a rotation drive mechanism for rotating the plurality of cams.

According to this configuration, the plurality of punch blades are operated in different phases using the cam mechanism, so that the punch blades can be operated in a desired manner with a simple configuration. Preferably, the rotation drive mechanism includes a cam shaft to which the plurality of cams are fixed in common, and a rotation drive source for rotating the cam shaft. The rotary drive source may be a motor, a solenoid-type rotary actuator, or a device that transmits a rotational force generated by operating a manual lever to the camshaft.

According to this configuration, the operation phase of the punch blade can be made different only by adjusting the mounting angle of the cam with respect to the cam shaft, so that the configuration is simplified. In addition, since a plurality of punch blades can be driven using one rotation drive source for rotating the camshaft, the configuration can be simplified and the cost can be reduced from this point as well.
In addition, since the punching operation of a plurality of punched holes is completed while the camshaft makes one rotation, the punching process of the punched holes can be completed quickly.

According to a third aspect of the present invention, the punch blade driving mechanism is respectively coupled to the plurality of punch blades to move the plurality of punch blades in a direction substantially perpendicular to the sheet member. 2. The punching device according to claim 1, further comprising a plurality of racks, a plurality of pinions meshed with the plurality of racks, and a rotation drive mechanism for rotating the plurality of pinions.

According to this configuration, by using the rack and pinion mechanism, the output torque of a rotary drive source such as a motor can be reduced as compared with the case where a cam mechanism is used. The rotation drive mechanism may include a rotation shaft to which the plurality of pinions are fixed in common, and a rotation drive source that applies a rotation force to the rotation shaft. Various types of rotary drive sources can be applied as in the case of the cam mechanism.

According to this configuration, a plurality of punch blades can be operated by rotating the rotation shaft by the rotation force from one rotation drive source. In this case, if the positional relationship between the rotation angle of the rotating shaft and the rack is made different between the plurality of punch blades, the plurality of punch blades can be operated in different phases.

[0016]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a simplified plan view for explaining a configuration of an image output device to which a punch device according to an embodiment of the present invention is applied. The image output device 10 is configured to expose a rectangular photosensitive material F (sheet body) carried on a rectangular table 1 provided to be reciprocally movable in the sub-scanning direction S with an exposure beam generated from an exposure device (not shown). Is a device for recording a latent image on the photosensitive material F by exposing the photosensitive material F along the main scanning direction M. The photosensitive material F on which the latent image is recorded is carried into the automatic developing machine 20, where it is subjected to a developing process, and becomes a printing plate.

The image output device 10 has a photosensitive material supply unit 30 attached thereto. The light-sensitive material supply unit 30 takes out the light-sensitive materials F one by one from a cassette 31 in which a plurality of light-sensitive materials F such as an aluminum plate or a polyester plate are stacked and stored,
It is supplied on the table 1 (shown by a solid line) at the home position HP. In order to transport the photosensitive material F, the photosensitive material supply unit 30 is provided with a supply roller pair 32.

The image output device 10 includes a main positioning mechanism 2 for positioning the photosensitive material F on the table 1 in the main scanning direction M between the photosensitive material supply unit 30 and the table 1.
have. The main positioning mechanism 2 has a sub-scanning direction S
, A pair of positioning levers 4 fixed to the arm 3 at an interval, and an arm 3
And an arm driving mechanism (not shown) for horizontally reciprocating in the main scanning direction M.

The photosensitive material F from the photosensitive material supply unit 30 is supplied to the table 1 through above the main positioning mechanism 2. After the photosensitive material F is supplied onto the table 1, the arm 30 is horizontally moved to a predetermined position in the main scanning direction M, and in the process, the positioning lever 4 faces the photosensitive material supply unit 30 of the photosensitive material F. The photosensitive material F is moved in the main scanning direction M. Thereby, the positioning of the photosensitive material F in the main scanning direction M is achieved.

The automatic developing machine 20 is closer to the automatic developing machine 20 than the table 1 (that is, the downstream side in the transport direction of the photosensitive material F during image recording).
A sub-positioning mechanism 5 for positioning the photosensitive material F on the table 1 in the sub-scanning direction S is disposed. The sub-positioning mechanism 5 includes an arm 6 arranged along the main scanning direction M, three positioning levers 7 spaced apart from the arm 6, and an arm 6 rotated by a predetermined angle. And a drive mechanism 8 for moving the lever 7 up and down. The arm 6 is a table 1
The drive mechanism 8 is arranged near the two corners of the table 1 at the home position HP on the automatic developing machine 20 side.

The table 1 is moved from the home position HP
When it is slightly displaced in the direction away from the automatic developing machine 20, the drive mechanism 8 and the arm 6 are engaged, the arm 6 is rotated, and the positioning lever 7 is raised. At this time, the positioning lever 7 abuts on the side of the photosensitive material F on the side facing the automatic developing machine 20, and performs positioning of the photosensitive material F in the sub-scanning direction S.

At a movement end position TP (shown by a two-dot chain line) of the table 1 in the sub-scanning direction S, a position corresponding to the side of the photosensitive material F facing the automatic developing machine 20 is provided.
And a discharge roller pair 9 for discharging the toner toward the automatic developing machine 20. Between the pair of discharge rollers 9 and the automatic developing machine 20 (that is, downstream of the pair of discharge rollers 9 in the photosensitive material discharge direction), a plurality of photosensitive materials F are provided near the end facing the automatic developing machine 20. A punch device 11 for forming punch holes (four in this embodiment) is arranged.

A plurality of punched holes are punched by the punching device 11 in the photosensitive material F being discharged by the discharge roller pair 9, and the photosensitive material F after the perforation processing is sent to the automatic developing machine 20. FIG. 2 is a simplified perspective view conceptually showing the entire configuration of the punching device 11. Punch device 11
Is a motor 41 as a rotary drive source, and the motor 41
A camshaft 42 coupled to the camshaft 42 via a coupling 44,
Eccentric cam C fixed at an interval to this cam shaft 42
1, C2, C3, and C4, and punch blades P1, P2, P3, and P4 driven by cams C1 to C4, respectively. The plurality of punch blades P1 to P4 are arranged parallel to each other along a direction perpendicular to the surface of the photosensitive material F to be punched. The cam shaft 42 is disposed along a direction perpendicular to the punch blades P1 to P4. As the motor 41, a motor capable of generating a necessary and sufficient output torque for a punching operation by one punch blade is applied.

The cams C1 to C4 provided to be engageable with the punch blades P1 to P4 are attached to the camshaft 42 at an angle of, for example, 30 degrees. Therefore, when the cam shaft 42 is rotated in one direction, the punch blade P1
P4 are reciprocally displaced in different phases along the direction perpendicular to the photosensitive material F. Then, while the cam shaft 42 makes one rotation, the punching of the four punch holes is completed.

The mounting angles of the cams C1 to C4 with respect to the cam shaft 42 are such that two or more punch blades do not perform a punching operation at the same time, and the punch holes are not drilled except when the first punch hole is drilled. At this time, at least one punch blade is set to penetrate the photosensitive material F. 3A and 3B are diagrams showing an example of setting the mounting angles of the cams C1 to C4 with respect to the camshaft 42. FIG. 3A shows the camshaft 42, and FIGS. 3B to 3D show FIGS. An example of an attached state of the cams C1 to C4 at positions A1, A2, A3, and A4 shown in FIG.

The camshaft 42 has screw receiving surfaces 51, 52, 53, 54 corresponding to the mounting positions of the cams C1 to C4. The screw holes 7 for receiving the mounting screws 61, 62, 63, 64 are formed in the cams C1 to C4.
1, 72, 73 and 74 are formed. By screwing the mounting screws 61 to 64 until they come into contact with the screw receiving surfaces 51 to 54, the cams C1 to C4 become
It will be attached to the camshaft 42 at an angle corresponding to the formation angle of 54.

In the example shown in FIG. 3B, the cams C1 to C4 are
This is an example in which the cam shaft 42 is attached to the cam shaft 42 at intervals of degrees, and the screw receiving surface 51 of the cam shaft 42 in FIG.
~ 54 forming angles. In this example, by rotating the cam shaft 42 in the rotation direction R, the punch blades P1 to P4 perform the punching operation in the following order. P1 →
P2 → P3 → P4, that is, a plurality of punch blades P1 to P4
Performs a punching operation sequentially from the punch blade at one end to the punch blade at the other end.

The screw receiving surfaces 51 to 51 formed on the cam shaft 42
By changing the angle at which the cams 54 are formed, the mounting angles of the cams C1 to C4 can be changed as shown in FIG. 3C or 3D. In the example of FIG. 3C, the cam C1 and the cam C4
Are mounted on the camshaft 42 at an angle of 30 degrees, the cams C4 and C2 are mounted on the camshaft 42 at an angle of 30 degrees, and the cams C2 and C3 are mounted at an angle of 30 degrees. It is attached to the shift cam shaft 42. In this example, the punch blades P1 to P4 perform the punching operation in the following order.

P1 → P4 → P2 → P3 That is, the punching operation is started from the punch blades P1 and P4 at both ends, and thereafter, the punch blades P2 and P4 near the center are driven. In the example of FIG. 3D, the cam C2 and the cam C3
Are mounted on the camshaft 42 at an angle of 30 degrees, the cams C3 and C1 are mounted on the camshaft 42 at an angle of 30 degrees, and the cams C1 and C4 are at an angle of 30 degrees. It is attached to the camshaft 42 while being shifted. In this example, the punch blades P1 to P4 perform the punching operation in the following order.

P2 → P3 → P1 → P4 That is, the punching operation is started from the punch blades P2 and P3 near the center, and thereafter, the punch blades P1 and P4 at both ends perform the punching operation. The mounting angles of the cams C1 to C4 do not necessarily need to differ by 30 degrees, and need not be shifted by the same angle. However, after a certain punch blade has finished piercing the photosensitive material F and before retreating from the photosensitive material F (that is, a period in which the photosensitive material F is penetrating), the next punch blade is moved to the photosensitive material F. The mounting angle needs to be determined so as to start drilling.

FIG. 4 shows a pair of discharge rollers 9 of the punching device 11.
5 is a plan view thereof, FIG. 6 is a left side view thereof, and FIG. 7 is a bottom view thereof. The punch device 11 includes an elongated upper bracket 12 having an L-shaped cross section, and a plurality (four in this embodiment) of punch blocks B1, B2, B3, and B4 attached to the bracket 12 at intervals. A pair of long dies 14 and 15 forming a passage 13 through which the photosensitive material F passes, and a lower die 1
5 and a long lower bracket 16 having an L-shaped cross section.

A motor 41 is fixed near one end of the upper bracket 12 by a motor mounting member 17. A camshaft 42 coupled to a drive shaft of the motor 41 via a coupling 44 extends along the longitudinal direction of the upper bracket 12 and penetrates a plurality of punch blocks B1 to B4. Each of the punch blocks B1 to B4 has a bolt 1 inserted through the upper bracket 12 and screwed to the upper die 14.
8 attached to the upper bracket 12,
Thereby, the attachment of the upper bracket 12 to the die 14 is also achieved.

The passages 13 through which the photosensitive material F passes are secured between the dies 14 and 15 by spacers 19 interposed at both ends thereof. Both ends of these dies 14 and 15 are fixed to each other by bolts 45. The lower bracket 16 is attached to the lower die 15 by bolts 46. The punch blades P1 to P4 included in the punch blocks B1 to B4 are formed in a rod-like body, and a blade portion for perforating the photosensitive material F is formed at the tip thereof. The blade portions of the punch blades P1 to P4 have respective planar shapes indicated by broken lines in FIG. A plurality of openings 47 (see FIG. 8) are formed in the upper die 14 to allow the punch blades P1 to P4 to pass therethrough. Further, as shown in FIG. 7, a punch die P
Die holes H1, H2, H3 formed corresponding to the positions and shapes of 1 to P4 and slightly larger than these.
H4 is formed. Further, at positions corresponding to the die holes H1 to H4 of the lower bracket 16, punch blades P1 to P1 are provided.
An opening 48 is formed to allow passage of P4 and allow punch chips to fall.

FIG. 8 is a sectional view showing a common configuration of punch blocks B1 to B4 (hereinafter, collectively referred to as "punch block B"). Cams C1 to C4 (hereinafter collectively referred to as “cam C”) are housed in the housing 55 having a substantially rectangular parallelepiped shape. This cam C
Is attached to the camshaft 42 as described above. The camshaft 42 penetrates a pair of opposed side walls of the housing 55 and is mounted on a bearing 49 fixed to the outer surface of one of the side walls. Supported. On the cam surface of cam C,
The heads of the punch blades P1 to P4 (hereinafter collectively referred to as “punch blade P”) are in contact. This punch blade P
Are arranged to extend vertically through a spring chamber 56 formed in a housing 55, and a flange member 57 is fixed at an intermediate portion thereof. A compression coil spring 58 is wound around the punch blade P below the flange member 57, and urges the punch blade P upward. The upward displacement of the punch blade P is restricted by the flange member 57 being in contact with the top surface of the spring chamber 56, and is located near the screw holes 71 to 74 of the cam C (see FIG. 3). When the part is opposed to the head of the punch blade P, a gap is secured between the head and the cam C.

With this configuration, after the cam shaft 42 is rotated and the cam C is rotated, and the cam surface of the cam C comes into contact with the head of the punch blade P, the coil blade 58 is compressed and the punch blade P is moved. The photosensitive material F is lowered and cooperated with the die holes H1 to H4 of the lower die 15 (hereinafter referred to as "die hole H"). Thereafter, as the cam C further rotates, the punch blade P is raised by the coil spring 58 until the flange member 57 contacts the top surface of the spring chamber 56.

FIG. 9 is an illustrative view showing an example of punching holes. The photosensitive material F is transported by the discharge roller pair 9,
When the leading edge Fa reaches the reference line Lref substantially along the center line of the punch device 11, the operation is stopped. In this state, when the motor 41 is biased and the camshaft 42 rotates, the punch blades P1 to P4 form a rectangular or semicircular notch (punch hole) near the leading edge Fa.

As described above, the punch device 1 of this embodiment
According to No. 1, after the punching of a punch hole by one punch blade P is completed, and the punch blade P penetrates the photosensitive material F, the punching by the next punch blade P is started. Is configured. For this reason, the photosensitive material F is positioned when the punch blade P that has previously punched a punch hole punches the next punch hole. Thereby, a plurality of punch holes can be formed at accurate positions of the photosensitive material F.

Further, since two or more punch blades P do not perform a punching operation at the same time, no excessive stress acts on the photosensitive material F, and there is no possibility that the photosensitive material F is greatly deformed at the time of punching. This also makes it possible to punch a punch hole at an accurate position. Further, since two or more punch blades P do not perform the punching operation at the same time, the motor 41 does not need to generate a large torque, and, of course, does not need to use a plurality of motors. Thus, a plurality of punch holes can be formed with a simple configuration.

Also, as long as the two punch blades P are not punched at the same time, even if the number of punch blades P is increased or decreased, the number of cams attached to the cam shaft 42 may be changed accordingly. It is not necessary to replace the motor 41 with a motor having a large output torque. Further, since a simple configuration is adopted in which the operation phase of the punch blades P1 to P4 is changed by shifting the mounting angles of the cams C1 to C4 with respect to the cam shaft 42, the manufacturing cost can be reduced.

FIG. 10 is a sectional view showing a configuration of a punch block applied to a punch device according to a second embodiment of the present invention. In FIG. 10, components corresponding to those in FIG. 8 are denoted by the same reference numerals as in FIG. The punch block is configured to reciprocate linearly reciprocate the punch blade P in a direction substantially perpendicular to the photosensitive material F using a rack and pinion. That is, the rack 81 is attached to the upper end of the punch blade P,
The rack 81 includes a pinion 83 fixed to a rotating shaft 82.
Is engaged. The rotation shaft 82 extends through the opposite side wall of the housing 84, and is rotatably driven by a motor (not shown) capable of rotating forward / reverse.

With this configuration, when the rotary shaft 82 is driven to rotate, this rotational motion is converted into linear motion of the punch blade P by the pinion 83 and the rack 81. Thus, a punch hole can be formed in the photosensitive material F by cooperation between the punch blade P and the die hole H formed in the die 15.
If a plurality of similar punch blocks are arranged along the rotation shaft 82, a plurality of punch blades can be driven by one motor. In this case, if the relationship between the pinion and the rack is set in advance for each punch block so that the operation of the punch blade is the same as in the case of the first embodiment, the case of the first embodiment is different from that of the first embodiment. Similar effects can be obtained.

Although the two embodiments of the present invention have been described, the present invention can be embodied in other forms.
For example, in the first and second embodiments,
Although the configuration in which all the punch blades are driven using one motor has been described as an example, for example, a plurality of motors each driving two to three punch blades may be used. Also in this case, by controlling the operation timing between the motors, one punch hole is punched at a time, and
It is preferable that the punching operation of the next punch hole is started while the punch blade having the one punch hole is penetrating the photosensitive material.

In the above embodiment, two or more punch holes are prevented from being punched at the same time. However, as long as no large stress acts on the photosensitive material F, two or more punch holes are punched simultaneously. It may be. That is, for example, when drilling four punch holes, two punch holes may be drilled first, and then the remaining two punch holes may be drilled. Further, first, one punch hole may be punched, and the remaining three punch holes may be punched simultaneously while the photosensitive material F is positioned by the punch blade having the punch hole.

Further, in the configuration of the above embodiment, for example, while the punch blade P1 is positioning the photosensitive material F, the punch blade P2 performs a punching operation, and the punch blade P2
The punch blades for positioning the photosensitive material F are sequentially changing such that the punching blade P3 performs the punching operation while the photosensitive material F is being positioned. However, for example, one punch blade may perform a punching operation, and thereafter, the state where the one punch blade penetrates the photosensitive material F may be maintained until the last punch hole is completed.

Further, in the above-described embodiment, the example in which the punched hole is a notch has been described, but the punched hole may be a complete hole having a continuous periphery. Further, in the first embodiment, the punching of all the punch holes is completed while the camshaft makes one rotation.
In the configuration of the second embodiment, the punching of all punch holes can be completed while the rotation shaft 82 rotates one or more rotations.

Further, in the above embodiment, a configuration in which a punched hole is formed in the photosensitive material has been described as an example. However, the present invention can be applied to an application in which a punched hole is formed in an arbitrary sheet body other than the photosensitive material. In particular, the present invention can be advantageously applied to a case where a plurality of punch holes are punched in a sheet body requiring a large punching force. In addition, various design changes can be made within the scope of the matters described in the claims.

[Brief description of the drawings]

FIG. 1 is a simplified plan view showing a configuration of an image output apparatus to which a punch device according to an embodiment of the present invention is applied.

FIG. 2 is a simplified perspective view conceptually showing the overall configuration of the punch device.

FIG. 3 is a diagram showing a setting example of a mounting angle of a cam with respect to a cam shaft.

FIG. 4 is a front view of the punch device as viewed from a discharge roller pair side.

FIG. 5 is a plan view of the punch device.

FIG. 6 is a side view of the punch device.

FIG. 7 is a bottom view of the punch device.

FIG. 8 is a cross-sectional view illustrating a configuration of a punch block.

FIG. 9 is an illustrative view showing an example of punching holes;

FIG. 10 is a cross-sectional view illustrating a configuration of a punch block applied to a punch device according to a second embodiment of the present invention.

[Explanation of symbols]

 11 Punching device 41 Motor 42 Cam shaft C1, C2, C3, C4 Cam P1, P2, P3, P4 Punch blade 81 Rack 82 Rotary shaft 83 Pinion

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Satoru Yasuda 5th Higashikujo Minamiishidacho, Minami-ku, Kyoto-shi, Kyoto, Japan

Claims (3)

[Claims] 1. A punch apparatus for punching a plurality of punch holes in a sheet body, comprising: a plurality of punch blades provided so as to be able to reciprocate in a direction substantially perpendicular to a sheet body to be punched; The operation phases of the two punch blades are made different so that one of the plurality of punch blades starts punching the sheet body while one of the at least two punch blades penetrates the sheet body. A punch blade driving mechanism for driving a plurality of punch blades. 2. The punch blade driving mechanism is provided so as to be engageable with each of the plurality of punch blades in order to move the plurality of punch blades in a direction substantially perpendicular to a sheet body to be punched. The punch apparatus according to claim 1, further comprising: a plurality of cams; and a rotation drive mechanism configured to rotationally drive the plurality of cams. 3. A punch blade driving mechanism, comprising: a plurality of racks respectively coupled to the plurality of punch blades for moving the plurality of punch blades along a direction substantially perpendicular to a sheet body; 2. The punching device according to claim 1, further comprising: a plurality of pinions meshed with the plurality of racks; and a rotary drive mechanism for rotating the plurality of pinions.