JP2008030938A - Sheet punching device and image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet punching device and an image forming device, capable of restraining useless electric power consumption, particularly in a punch unit of a small number of holes, by setting electric power of a motor for a punching driving mechanism, in response to the number of punching holes formed in a punching means. <P>SOLUTION: This sheet punching device B has carrying means 4, 5, 6, 10, 11 and 12 carrying a sheet delivered from an image processor or an image forming device, and the punching means 8 punching the sheet carried from the carrying means, and further has a control means 47 changing the electric power supplied to the motor 21 for the punching driving mechanism of the punching means 8 in response to the number of punching holes of the punching means. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is provided with an image forming apparatus or the like, and a sheet-shaped transfer medium discharged from the apparatus, for example, a sheet punching apparatus that punches a transfer paper (sheet) by punching means, a sheet processing apparatus including the punching apparatus, and this The present invention relates to an image forming apparatus provided with a sheet processing apparatus integrally or separately.

Currently, there is a function of punching a sheet discharged from the image forming apparatus as post-processing. There are two types of punches for each destination (country), and there are 2 holes with a punch diameter of 6.5 mm in Japan, and 2 holes and 3 holes with a punch diameter of 8 mm in North America. In Europe, there are many types of punch holes such as 4 holes with a punch diameter of 6.5 mm, which are equally spaced, 4 holes which are not evenly spaced in Northern Europe, and multi-holes for binders.
When the number of holes to be drilled by the drilling means increases, the drilling torque increases, and it is necessary to increase the power supplied to the drilling motor. Further, when the number of perforation holes in the perforation means increases, the perforation means itself becomes heavier and it is necessary to increase the power supplied to the motor that slides the perforation means.
Thus, since the punching means itself becomes heavy, it becomes necessary to use a motor with a higher torque. This increases the possibility of cost increase. Further, when the number of perforated holes is increased, the perforation torque is increased and more perforation time is required.

However, if the power of the drilling drive mechanism motor and the slide movement mechanism motor is set in accordance with the punching means having the largest drilling torque, in the case of a unit having a small number of drilling holes, wasteful power is consumed. There is.
In the present invention, in consideration of the above-described circumstances, it is possible to suppress wasteful power consumption particularly in the drilling means with a small number of holes by setting the power of the motor for the drilling drive mechanism according to the type of the punching means. Another object is to provide a sheet punching device and an image forming apparatus.

In order to solve the above-mentioned problem, the invention according to claim 1 is directed to conveying means for conveying a sheet delivered from a sheet processing apparatus or an image forming apparatus, and perforation for punching a sheet conveyed by the conveying means. A sheet punching device comprising: a control means for changing electric power supplied to a motor for a punching drive mechanism provided in the punching means according to the number of punching holes formed in the punching means. Features a drilling device.
According to a second aspect of the present invention, the control means controls the power supplied to the drilling drive mechanism motor to increase as the number of the drilled holes formed in the drilling means increases. The sheet punching device according to Item 1 is characterized.
According to a third aspect of the present invention, there is provided a conveying unit that conveys a sheet delivered from a sheet processing apparatus or an image forming apparatus, a perforating unit that perforates a sheet conveyed by the conveying unit, and the perforating unit. In the sheet punching device comprising a sliding means for sliding, a control means for changing electric power supplied to a motor for a slide moving mechanism constituting the moving means in accordance with the number of the punched holes formed in the punching means. A sheet punching device comprising:

According to a fourth aspect of the present invention, the control means controls the power supplied to the slide moving mechanism motor to be increased as the number of the perforated holes formed in the perforating means is larger. Item 3. A sheet punching device according to Item 3.
According to a fifth aspect of the present invention, there is provided an image forming apparatus having the sheet punching device according to any one of the first to fourth aspects.

According to the present invention, it is possible to suppress wasteful power consumption, particularly in the drilling means with a small number of holes, by setting the power of the drilling motor according to the type of the punching means.
In addition, according to the present invention, it is possible to use wasteful consumption especially in the drilling means with a small number of holes by providing the control means for changing the electric power supplied to the motor for the slide movement mechanism of the moving means according to the type of the punching means. Power can be reduced.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram illustrating the overall configuration of the present invention. A sheet discharged from the main body discharge roller 1 of the image forming apparatus A showing only the cutout shape passes through the inlet sensor S1 and is delivered to the inlet roller 2 of the sheet punching apparatus B.
Thereafter, when the punching process is not performed, the sheet delivered to the entrance roller 2 passes straight through the branch claw 3, passes through the horizontal roller 14, and is discharged to the discharge roller 13. And loaded on a stacker (not shown) or, if present, fed to a downstream aftertreatment device.
When performing the punching process, the punch passes through the lower side of the branch claw 3 and is conveyed to the first, second and third vertical conveying rollers 4 to 6. Switching of the branch claw 3 is performed by a DC solenoid or a stepping motor (not shown).

When the leading edge of the sheet hits the registration roller 7 (stopped) disposed downstream of the third vertical conveying roller 6 and an appropriate amount of bending is formed, the skew of the leading edge of the sheet is corrected. The bend is formed in the bend forming space shown in FIG. 1, and the propulsive force of the leading end of the sheet is increased by pressing the bend with an elastic deformation member (not shown), and skew correction is performed with higher accuracy.
The setting of the amount of deflection is managed by the number of pulses after the leading edge of the sheet is detected by the inlet sensor S1, and the amount of feeding after the leading edge of the sheet hits the registration roller 7 (stopped state) is determined. The default value is set at a deflection amount of 5 mm, but the deflection amount can be changed in the SP mode.
Therefore, in the case of a thin sheet that is weak and difficult to perform skew correction, a setting such as increasing the amount of bending can be performed. When the flexure is formed, the first to third vertical conveying rollers 4 to 6 (including the entrance roller 2 in the case of a longitudinal sheet) holding the sheet upstream of the registration roller 7 are stopped. .

When a predetermined amount of bending is formed, the registration roller 7 and the conveying roller sandwiching the sheet upstream thereof start to rotate at the same time, and the speed is increased to a linear speed faster than the receiving linear speed, thereby obtaining a paper interval time.
Here, since the distance between the registration roller 7 and the main body discharge roller 1 is longer than the maximum sheet size on which skew correction (perforation) is performed, the sheet is completely discharged from the main body of the image forming apparatus A. In this state, it can abut against the registration roller 7.
In this way, when skew correction is performed, the sheet is not sandwiched between the main body discharge rollers 1, so the registration rollers 7 start to rotate and have the same linear velocity as the main body of the image forming apparatus A. The main body paper discharge roller 1 that continues to rotate until the bending does not continue to increase. Since the amount of bending is not excessive, the sheet will not be damaged, such as wrinkles or breaks.

FIG. 2 is a schematic view showing the punch unit and the lateral registration sensor S2. Next, the skew-corrected sheet passes through the lateral registration sensor S2. As shown in FIG. 2, a CCD line sensor LS is used as the lateral registration sensor S2, and the CCD is arranged to cover the range from the minimum width size to the maximum width size so that the side end face of the sheet can be detected. It has become.
Naturally, detection is possible even when the sheets are shifted laterally, and detection is possible without any problem up to ± 7.5 mm. Next, the punch unit (piercing means) 8 is slid in the direction orthogonal to the transport direction by the difference between the position of the side end face detected by the lateral registration sensor S2 and the position ideally transported.

The punch unit 8 stands by at a position moved to the front side (or the back side) with respect to the transfer center position by an amount of the assumed maximum lateral registration displacement (set to 7.5 mm). When the sheet is conveyed with no deviation, the punch unit 8 slides by 7.5 mm and perforates.
When the sheet is transported in a state shifted by 2 mm toward the front side, the hole is pierced by 5.5 mm sliding. The slide movement of the punch unit 8 is preferably completed immediately before the sheet stops at a predetermined punching location.
Even though the sheet is stopped, if the punch unit 8 is in the middle of sliding movement, punching cannot be performed, and productivity is reduced. If the slide movement is completed long before the sheet stops, the detection by the lateral registration sensor S2 is too early, and the lateral registration detection accuracy deteriorates.

FIG. 3 is a schematic perspective view showing the positional relationship between the punch unit 8 and the lateral registration sensor S2. As shown in FIG. 3, the positional relationship between the punch unit 8 and the lateral registration sensor S2 is located upstream of the punch unit 8 with respect to the sheet conveyance direction.
After punching, as shown in FIG. 1, in order to prevent collision with the next sheet, the sheet is accelerated again and conveyed to post-punch conveying rollers 9, fourth, fifth and sixth vertical conveying rollers 10-12. Finally, the paper is discharged from the paper discharge roller 13, and if it exists, it is delivered to the downstream processing apparatus.

FIG. 4 is a flowchart for explaining the overall operation flow of the sheet punching apparatus according to the present invention. FIG. 5 is a flowchart for explaining the operation flow of the lateral registration detection process. FIG. 6 is a flowchart for explaining the operation flow of the punch unit moving process.
1 and 4 to 6, first, the sheet punching device B is initialized (S1), and the initial operation is started (S2). Next, it is determined whether or not the job is started (S3). If it is started, the entrance roller 2 is driven (S4). Next, the first, second and third vertical conveying rollers 4 to 6 are driven at the receiving linear velocity (S5).
Next, it is determined whether the entrance sensor S1 is on (S6). If it is on, it is determined whether the leading edge of the sheet has reached the registration roller 7 (S7). If it has reached, it is determined whether or not the amount of bending is conveyed (S8). If it is a deflection amount conveyance, the 1st, 2nd and 3rd vertical conveyance rollers 4-6 will be stopped (S9).

Subsequently, the first, second and third vertical conveying rollers 4 to 6 are driven at a high linear velocity (S10). The registration roller 7 is driven at a high linear velocity (S11). It is determined whether the leading edge of the sheet has passed the lateral registration sensor S2 (S12). If it has passed, the post-punch conveying roller 9 is driven at a high linear velocity (S13).
Next, the fourth, fifth and sixth vertical conveying rollers 10 to 12 are driven at a high linear velocity (S14). Next, a lateral registration detection process is performed (S15). Here, as shown in FIG. 5, the CCD line sensor LS is read (S15a), and the amount of movement of the punch unit 8 is calculated (S15b). The punch unit 8 is moved (S16). Here, the punch unit 8 is moved by the movement amount calculated in the lateral registration detection process (S16a).

It is determined whether or not the trailing edge of the sheet has reached the punching position (S17). If it has reached, the post-punch conveying roller 9 is stopped (S18). Depending on the sheet size, the fourth, fifth and sixth vertical conveying rollers 10 to 12 are stopped (S19). Next, punch punching is performed (S20). The post-punching conveying roller 9 is driven at a high linear velocity (S21). Next, the fourth, fifth and sixth vertical conveying rollers 10 to 12 are driven at a high linear velocity (S22).
The paper discharge roller 13 is driven at a high linear speed (S23), and it is determined whether or not the paper discharge sensor S3 is on (S24). If it is ON, the fourth, fifth and sixth vertical conveying rollers 10 to 12 are driven at the receiving linear speed according to the sheet size (S25). Next, the paper discharge roller 13 is driven at the receiving linear speed (S26). It is determined whether the paper discharge sensor S3 is off (S27). If it is off, it is determined whether there is no sheet in the image forming apparatus A main body (inside the apparatus) (S28). If there is no sheet (Yes in S28), step ( If there is a sheet in S2) (No in S28), the operation proceeds from step (S4).

FIG. 7 is a perspective view showing the entire slide mechanism of the punch unit 8 as viewed from the sheet conveying direction. FIG. 8 is an enlarged perspective view showing the periphery of the motor of the slide mechanism of the punch unit 8 of FIG. FIG. 9 is an enlarged perspective view showing the periphery of the timing belt on the back side of the motor of the slide mechanism of the punch unit 8 of FIG. 10 is a schematic side sectional view showing the vicinity of the line 10-10 of the punch unit of FIG.
Next, the slide mechanism of the punch unit 8 will be described with reference to FIGS. As described above, the punch unit 8 aligns in the direction perpendicular to the conveyance direction by the difference between the position of the side end surface detected by the lateral registration sensor S2 (FIG. 1) and the position ideally conveyed. It is slid so as to perform, improving the punch position accuracy.
First, the punch unit 8 is fixed on the base 32 by a docking pin 30 and a knob screw 36. The docking pin 30 is integrated with the pin bracket 31 and is fixed to the base 32.

As shown better in FIG. 10, rollers 32 are attached to the base 32 at four positions, front, rear, left, and right, and the punch unit 8 rolls in a U-shaped portion of the stay 33 and extends in a direction perpendicular to the sheet conveying direction. It is designed to slide.
Regarding the drive, the timing belt 38 and the base 32, which are wound through the stepping motor 39 and the stepping motor pulley 39a, are fixed by a fixing plate 37, and the timing belt 38 is moved by forward and reverse rotations of the stepping motor 39. Is done by.
The slide operation amount is managed by the pulse count, and the smaller the movement amount per pulse, the smaller the position correction becomes possible. The home position of the punch unit 8 is obtained by detecting the edge of the shielding plate 32a which is a part of the shape of the base 32 by the home sensor 40 as shown in FIG.
As described above, the punch unit 8 stands by at a position moved to the front side (or the back side) with respect to the conveyance center position in FIG. 2 by the assumed maximum lateral registration amount (set to 7.5 mm). Yes. The position is the position where the home sensor 40 detects the edge of the shielding plate 32a.

FIG. 11 is a schematic view showing a punch driving mechanism of the punch unit 8. FIG. 12 is a schematic diagram for explaining the operation of the punch blade. FIG. 13 is an enlarged perspective view showing the vicinity of the ratchet gear and the pin bracket of the punching drive mechanism of the punch unit. FIG. 14 is an enlarged perspective view showing the vicinity of the ratchet and the detection disk of the punching drive mechanism of the punch unit. FIG. 15 is a schematic view showing an arrangement of punch blades of the punch unit 8.
Next, the punching drive mechanism of the punch unit 8 will be described with reference to FIGS. As shown in FIGS. 11, 12, and 15, the punch unit 8 has a shaft 20 extending in the longitudinal direction thereof. Cams 25 are fixed to both ends of the shaft 20, and when the cams 25 are rotated, the bracket 26 is pushed downward, and the punch blades 27 perforate the sheet.
The detection disc 16 and the ratchet 15 are fixed to the end of the shaft 20 by an appropriate method, and the meshing portion 17a of the ratchet gear 17 contacts the meshing portion 15a of the ratchet 15 as shown in FIGS. Then, rotation is transmitted from the ratchet gear 17 to the ratchet 15, and as a result, the shaft 20 and the cam 25 rotate.

Driving to the ratchet gear 17 is transmitted from a drilling drive mechanism motor (drilling motor) 21 and a motor gear 21a (FIG. 9) connected thereto. An encoder 21b is fixed to the rear portion of the drilling motor 21 on the same shaft as the motor shaft, and a pulse is read by the encoder sensor 22 to manage brake timing and the like.
The home position of the punch blade 27 can be obtained by detecting the notch provided in the detection disk 16 with the home sensor 18. Each time the detection disk 16 makes one rotation, stop and start are repeated to perform perforation.
As shown in FIG. 7, the punch scraps 45 generated by the punching pass through the punch scrap guide 44 and are accommodated in the hopper 46 (FIG. 1). The accommodation state of the punch scraps 45 is as shown in FIG.

As shown in FIG. 1, the punch unit 8 is disposed in the lowermost horizontal portion of the U-shaped transport path formed by the first vertical transport roller 4 to the sixth vertical transport roller 12, etc. The punch scraps 45 need only fall directly below. At that time, as shown in FIG. 10, it is only necessary to secure a path to the base 32 with the punch scrap guide 44.
As shown in FIG. 12A, the punch blade 27 is in one home position, performs punching in FIG. 12B, and waits at the position of FIG.

FIG. 16 is a schematic diagram for explaining the home position of the punch blade. The position shown in FIG. 16 is the home position of the punch blade 27. The target position is the center of the notch of the detection disk 16 by the home sensor 18 (when the notch angle is β °, the position is (β / 2) °).
Since the punching time and punching speed vary depending on the thickness of the sheet, temperature environment, voltage, etc., the home position during all punching does not become the above-mentioned position, but the home sensor 18 detects the notch (β The punch blade 27 does not protrude downward from the punch upper guide plate 28 if it is in the range (°).
If the punch disk 27 stops beyond the cutout portion of the detection disk 16, the punch blade 27 protrudes from the punch upper guide plate 28, so that the leading edge of the next sheet comes into contact with the punch blade 27 and is scratched or jammed. There is a possibility.
The drilling motor 21 is fixed to a motor bracket 23, and the motor bracket 23 is fixed to a base 32. Therefore, the perforating motor 21 and the motor bracket 23 or all the parts fixed to them slide together with the base 32 in the moving direction of FIG.

FIG. 17 is a schematic block diagram for explaining the control of the punching motor 21 and the slide mechanism motor 39. According to the present invention, the electric power to the punching motor 21 is controlled by the main body side control device (control means) 47 of the image forming apparatus A (FIG. 1) according to the signal received from the encoder 21b. 1 is controlled and supplied according to the type of punch unit 8 (FIG. 1) that is the punching means, that is, the degree of punching.
The power to the stepping motor 39, which is a motor for the slide movement mechanism, is controlled by the control device 48 of the sheet punching device B (FIG. 1) controlled by the main body side control device 47 of the image forming apparatus A (FIG. 1). As shown in FIG. 2, the punch unit 8 (FIG. 1) is slid in a direction perpendicular to the conveyance direction in accordance with the difference between the position of the sheet side end surface detected by the lateral registration sensor S2 and the position ideally conveyed. Controlled so that it can be moved.

FIG. 18 is a schematic perspective view showing the exchange of the punch unit 8 in a state where the ratchet and the detection disk are easy to see. FIG. 19 is a schematic perspective view showing the exchange of the punch unit in a state where the ratchet gear and the home sensor are easy to see. FIG. 20 is a schematic diagram for explaining a gap surface opened on the opposite side of the meshing portion.
As shown in FIGS. 18 and 19, the punch unit 8 can be replaced only by removing the knob screw 36 (FIG. 7) from the front surface of the machine. The punch unit 8 is slid to the front side (opposite to the insertion direction in FIG. 18) with the ratchet 15 and the detection disk 16 fixed thereto.
When the punch unit 8 is removed, the meshing portions 15a and 17a of the ratchet 15 and the ratchet gear 17 are separated from each other, so that drive transmission is interrupted. On the other hand, because it is in the cut-off state, the drive unit is not mounted on the punch unit 8 that has been removed for replacement, so that there is less time for replacement.

If there is a drive part, the operation of removing the connector occurs, which takes time and is expensive as a replacement unit. With this configuration, the punch unit 8 can be exchanged in a simple and inexpensive unit according to the convenience of the user.
When the punch unit 8 is mounted, there may be a case where the meshing portions 15a and 17a of the ratchet 15 and the ratchet gear 17 do not mesh as described above. At that time, as shown in FIG. 9, the meshing portions 15 a and 17 a are mounted by sliding the shaft 24 by the ratchet gear 17 pushed by the ratchet 15 and adjusting the spring 19 while compressing it.
Therefore, when the initial operation is started, the ratchet gear 17 is rotated, and when it reaches the meshing position with the ratchet 15, the ratchet gear 17 is pushed by the spring 19 so that the drive can be transmitted. This state is shown in FIG. There is a surface with a clearance of α ° at the facing surfaces of the meshing portions 15a and 17a, and the ratchet 15 and the ratchet gear 17 can be meshed at the initial time due to the clearance.

As described above, the sheet processing related to the image forming apparatus currently has a function of punching (punching) by a punch unit as a post-processing on the sheet discharged from the image forming apparatus A as shown in FIG.
As described above, the punch (perforation) is different in each destination (country) by punch (perforation), that is, the type of punch unit is different. There are 2 holes and 3 holes with a punch diameter of φ8 mm. In Europe, there are many types of punches such as four holes with a punch diameter of 6.5 mm and equally spaced holes, four holes that are not evenly spaced in Northern Europe, and multiple holes for binders.

Compared to punch units with two holes, four holes, etc., a punch unit with a large number of holes has a higher drilling torque and takes longer time to punch. If the productivity of the copying machine is set in accordance with the punch unit that takes the longest time, the productivity of the punch unit with a small number of holes is lowered.
Therefore, by setting the productivity of the copying machine (image forming apparatus) A according to the type of punch unit, it is possible to prevent a decrease in productivity, particularly in a punch unit having a small number of holes. In view of the type of punch, the present invention controls the power supply to the punching motor 21 as described above according to the type of the punching means (punch unit) 8.

FIG. 21 is a flowchart showing an operation flow of punch information transmission processing on the punching device side. Referring to FIGS. 1, 17 and 21, on the sheet punching device B side, the control device 48 detects the type of punching (piercing) (the number of punching holes) (S31). The detected punch information is transmitted to the main body side control device 47 on the image forming apparatus (copier) A side, the information of the punch unit 8 is taken in, and this information is returned to the sheet punching device B again. In accordance with the type of (perforation), the power supplied to the perforation motor 21 is set (S32).
Compared to punch units with two holes, four holes, etc., a punch unit with a large number of holes has a large drilling torque, and it is necessary to increase the power supplied to the motor 21 for drilling. If the power of the drilling motor 21 is set in accordance with the punch unit 8 having the largest drilling torque, useless power is consumed in the case of a unit having a small number of drilling holes.

Therefore, even if a punch unit with a different number of punch holes is newly added by setting the power supplied to the punching motor 21 in accordance with the number of punch holes of the punch unit, especially in a punch unit with a small number of holes. Wasteful power consumption can be suppressed. As for the method of varying the supplied power, the motor voltage may be varied, or the limit value of the motor current may be varied.
In the case of a multi-hole punch or the like, the number of punch (drilling) blades increases, and the punch unit becomes heavier than the unit with a small number of holes. For this reason, the torque required to slide the punch unit 8 increases, and the power supplied to the stepping motor 39 needs to be increased. However, if the power of the slide mechanism motor is set in accordance with the punch unit having the largest slide torque, useless power is consumed in the case of a unit having a small number of holes.

FIG. 22 is a flowchart showing an operation flow of power setting of the slide unit motor of the punch unit. Referring to FIGS. 1, 17 and 22, on the sheet punching device B side, the control device 48 detects the type of punching (punching) (S33). The detected punch information is transmitted to the main body side control device 47 on the image forming apparatus (copier) A side, the information of the punch unit 8 is taken in, and this information is returned to the sheet punching device B again. The power supplied to the stepping motor 39 is set according to the type of (perforation) (S34).
As described above, by setting the power of the stepping motor 39 according to the type of the punch unit 8, wasteful power consumption can be suppressed particularly in the punch unit having a small number of holes.
Further, the punch unit becomes heavier according to the number of punch holes in the punch unit, and the torque required to slide the punch unit increases. For this reason, it is necessary to increase the power supplied to the stepping motor 39. Therefore, by setting the power of the stepping motor 39 according to the number of punch holes of the punch unit 8, even if a punch unit with a different number of punch holes is newly added, it is easier, especially a punch unit with a small number of holes. In, wasteful power consumption can be suppressed.

  The sheet punching device of the present invention can be applied to various image forming apparatuses. That is, for example, an electrostatic latent image formed on a photosensitive member by exposure from an exposure device is developed with toner supplied from a developing device, and the toner image is transferred and fixed on a transfer material. The present invention can also be applied to image forming apparatuses (copiers, printers, facsimile apparatuses), ink jet printers, and the like.

BRIEF DESCRIPTION OF THE DRAWINGS Schematic explaining the whole structure of this invention. Schematic which shows a punch unit and lateral registration sensor S2. The schematic perspective view which shows the positional relationship of a punch unit and a lateral registration sensor. The flowchart explaining the operation | movement flow of the whole sheet punching apparatus by this invention. The flowchart explaining the operation | movement flow of a horizontal registration detection process. The flowchart explaining the operation | movement flow of a punch unit movement process. The perspective view which shows the whole slide mechanism of the punch unit seen from the sheet conveyance direction. The perspective view which expands and shows the motor periphery of the slide mechanism of the punch unit of FIG. The perspective view which expands and shows the timing belt periphery in the back side of the motor of the slide mechanism of the punch unit of FIG. FIG. 10 is a schematic side sectional view showing the vicinity of the line 10-10 of the punch unit of FIG. 7; Schematic which shows the punching drive mechanism of a punch unit. Schematic explaining operation | movement of a punch blade. The perspective view which expands and shows the ratchet gear and pin bracket vicinity of the punching drive mechanism of a punch unit. The perspective view which expands and shows the ratchet and detection disc vicinity of the punching drive mechanism of a punch unit. Schematic which shows the arrangement | sequence of the punch blade of a punch unit. Schematic explaining the home position of a punch blade. The schematic block diagram explaining control of the motor for a punch, and the motor for a slide mechanism. The schematic perspective view which shows replacement | exchange of a punch unit in the state which is easy to see a ratchet and a detection disc. The schematic perspective view which shows replacement | exchange of a punch unit in the state which is easy to see a ratchet gear and a home sensor. Schematic explaining the clearance gap surface opened in the facing of the meshing part. The flowchart which shows the operation | movement flow of the electric power setting of the drilling motor of a punching apparatus. The flowchart which shows the operation | movement flow of the electric power setting of the motor for slide mechanisms of a punch unit.

Explanation of symbols

  A image forming apparatus (copier), B sheet punching apparatus, S1 inlet sensor, S2 lateral registration sensor, S3 paper discharge sensor, 1 main body paper discharge roller, 2 inlet roller, 4 transport means (first vertical transport roller), 5 transport Means (second vertical conveying roller), 6 conveying means (second vertical conveying roller), 7 registration roller, 8 punch unit, 9 post-punch conveying roller, 10 conveying means (fourth vertical conveying roller), 11 conveying means (first 5 vertical conveying rollers), 12 conveying means (sixth vertical conveying roller), 21 motor for punching, 21b encoder, 22 encoder sensor, 30 docking pin, 31 pin bracket, 32 base, 33 stay, 35 roller, 36 knob screw, 38 Timing belt, 39 stepping motor, 47 main body side control device (image forming apparatus A side), 48 control means (Control device for sheet punching device B), LS CCD line sensor

Claims (5)

  A sheet punching device comprising: a transport unit that transports a sheet delivered from a sheet processing apparatus or an image forming apparatus; and a punching unit that punches a sheet transported by the transport unit. A sheet punching device comprising: a control unit that changes electric power supplied to a motor for a punching drive mechanism provided in the punching unit according to the number of punching holes.   2. The sheet punching according to claim 1, wherein the control unit controls to increase the power supplied to the motor for the punching drive mechanism as the number of the punching holes formed in the punching unit increases. apparatus.   A sheet punch comprising: a transport unit that transports a sheet delivered from a sheet processing apparatus or an image forming apparatus; a punch unit that punches a sheet transported by the transport unit; and a moving unit that slides the punch unit. In the apparatus, the sheet punching device further comprises a control unit that changes electric power supplied to a slide moving mechanism motor constituting the moving unit according to the number of the punched holes formed in the punching unit. .   4. The sheet punching according to claim 3, wherein the control unit performs control to increase the power supplied to the motor for the slide movement mechanism as the number of the punched holes formed in the punching unit increases. 5. apparatus.   An image forming apparatus comprising the sheet punching device according to claim 1.

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