JP2012185392A - Post-processing device and image forming apparatus - Google Patents

Post-processing device and image forming apparatus Download PDF

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JP2012185392A
JP2012185392A JP2011049462A JP2011049462A JP2012185392A JP 2012185392 A JP2012185392 A JP 2012185392A JP 2011049462 A JP2011049462 A JP 2011049462A JP 2011049462 A JP2011049462 A JP 2011049462A JP 2012185392 A JP2012185392 A JP 2012185392A
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processing
post
recording medium
paper
unit
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JP5703858B2 (en
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Yasuo Oba
康雄 大場
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Ricoh Co Ltd
株式会社リコー
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Abstract

There is provided a post-processing apparatus capable of preventing unintended behavior of a sheet while preventing a blocking phenomenon and obtaining good post-processing quality.
A speed variation with respect to a target speed of a DC motor 20 during sheet conveyance on a conveyance path is detected by a speed variation detection unit 27, and a sheet thickness is determined by a sheet thickness determination unit 28 based on the detected value. The fan control means 25 changes the drive (air flow rate) of the fan motor 21 of the cooling fan according to the determination result.
[Selection] Figure 11

Description

  The present invention relates to a post-processing device that is provided integrally or detachably in an image forming apparatus and performs post-processing such as binding, alignment, and punching on a recording medium on which an image is formed by the image forming apparatus, and the post-processing device. The present invention relates to an image forming apparatus such as a copier, a printer, a facsimile machine, a plotter, and a multifunction machine provided with at least one of them.

In the flow in which the paper on which the image is formed by the image forming apparatus is stacked on the post-processing apparatus, the heat at the time of image formation is held up to the post-processing apparatus without being cooled, and the images (toners) stick to each other when stacked. (Hereinafter referred to as “blocking phenomenon”) occurs.
As countermeasures, there are already known a method in which the paper itself is blown and cooled, and a method in which the paper is cooled by blowing air to a guide member that is in contact with the paper to remove heat from the paper.
In Patent Document 1, for the purpose of efficiently cooling paper, cooling is performed by a blower fan on a stacking tray after paper discharge, and the drive of the blower fan is controlled by conditions such as presence / absence of sheets, number of sheets, and temperature. A configuration is disclosed.

However, in the conventional method for preventing the blocking phenomenon, even if the paper can be cooled, there are some cases where there is a bad effect and a sufficient effect cannot be obtained.
That is, in the method of directly cooling the paper, there is a problem that unintended behavior of the paper is seen due to the wind hitting the paper, and the orderliness is lost and normal post-processing and stacking cannot be performed.
In addition, the method of cooling the guide member has a problem that a machine with few guide members in contact with the sheet during conveyance cannot remove heat from the sheet and cannot prevent the blocking phenomenon.
Even in the invention described in Patent Document 1, the problem that the paper does not behave unintentionally cannot be solved.

  The present invention has been made in view of the current situation as described above, and provides a post-processing apparatus that can suppress unintended behavior of a sheet while preventing a blocking phenomenon and can obtain good post-processing quality. , Its main purpose.

In order to achieve the above object, the present invention makes a judgment of the paper thickness during conveyance of the paper, and controls the air to be blown with a strength corresponding to the paper thickness, while exhibiting a cooling effect on the thick paper, For thin paper, it is based on the idea of preventing unintended behavior of the paper due to blowing.
Specifically, according to the first aspect of the present invention, the sheet-like recording medium discharged from the image forming apparatus is sequentially received, and the conveyance path for conveying the recording medium to the post-processing unit and the recording medium are conveyed. A conveyance drive unit that operates the drive source, a conveyance control unit that controls the conveyance drive unit, a processing tray for temporarily loading the recording medium from the conveyance path, and a post-processing on the recording medium on the processing tray A post-processing unit for applying a cooling fan, a cooling fan for cooling the recording medium,
In a post-processing apparatus including a fan drive unit that operates the cooling fan and a fan control unit that controls the fan drive unit, a drive source for transporting the recording medium is a DC motor, and the transport path The thickness of the recording medium is determined from the speed fluctuation with respect to the target speed of the DC motor during conveyance of the recording medium, and the drive control of the cooling fan is changed according to the determination result.

According to a second aspect of the present invention, in the post-processing apparatus according to the first aspect, in the conveyance of the recording medium by the conveyance driving unit, when there are at least two kinds of driving speeds, the target speed of the DC motor is It is characterized in that the detection timing of the speed fluctuation is when the recording medium is conveyed by high speed driving.
According to a third aspect of the present invention, in the post-processing apparatus according to the first or second aspect, when it is determined that the recording medium is thin as a result of the thickness determination of the recording medium, the air volume of the cooling fan is less than normal. It is characterized by doing.
According to a fourth aspect of the present invention, in the post-processing apparatus according to the first or second aspect, when it is determined that the recording medium is even thicker by the thickness determination result of the recording medium, the air flow rate of the cooling fan is normally set. It is characterized by more.

According to a fifth aspect of the present invention, in the post-processing apparatus according to the third aspect, the control of the cooling fan is switched at least twice according to the position of the recording medium.
According to a sixth aspect of the present invention, in the post-processing apparatus according to any one of the first to fifth aspects, the thickness of the recording medium and the air flow rate of the cooling fan are calculated based on the thickness determination result of the recording medium. The control of the cooling fan is changed so that is proportional.
According to a seventh aspect of the present invention, in the post-processing apparatus according to the first or second aspect, a perforation unit that performs a perforation process on a recording medium on the transport path, a perforation driving unit that drives the perforation unit, and the A perforation unit including a perforation control unit for controlling the perforation driving unit, and a recording medium thickness determination result based on a speed fluctuation of the DC motor, and a recording medium thickness based on a perforation time in the perforation driving unit. The control of the cooling fan is changed according to one of the determination results.

According to an eighth aspect of the present invention, in the post-processing apparatus according to the seventh aspect, during the perforation in the perforation unit, the driving of the cooling fan is stopped regardless of the thickness determination result of the recording medium. It is characterized by.
According to a ninth aspect of the present invention, in the image forming apparatus, the post-processing apparatus according to any one of the first to eighth aspects is provided integrally or detachably.

According to the present invention, an unintended behavior of a sheet can be suppressed while preventing a blocking phenomenon, and good post-processing quality can be obtained.
According to the second aspect of the present invention, the speed fluctuation due to the influence of the paper thickness becomes larger in the high speed driving than in the low speed driving, and the difference between the thin paper and the thick paper becomes clearer. The paper thickness can be determined, and the time for efficiently cooling the paper can be increased.
According to the invention described in claim 3, by restricting the air volume at the time of thin paper, it is possible to prevent the occurrence of unintended paper behavior while cooling the paper as much as possible. Further, power consumption due to unnecessary operations can be suppressed.
According to the fourth aspect of the present invention, the paper can be cooled more efficiently for a longer time than the normal time by increasing the air volume without waiting for the elapse of a fixed time when the paper is thick.
According to the fifth aspect of the present invention, when the sheet is held by the conveyance roller or the like, cooling is performed as much as possible, and when the sheet is not held, unintended sheet behavior can be prevented. .
According to the sixth aspect of the present invention, if the control is changed so that the paper thickness and the air flow rate of the fan motor are proportional to each other, rather than classifying the paper thickness in stages (thin, normal, thick), the minute paper Even if the thickness is different, more appropriate cooling is possible, and the sheet can be efficiently cooled.
According to the seventh aspect of the invention, by detecting the thick paper at the time of the punching process, the paper can be cooled for a longer time by the time required for detecting the paper thickness during conveyance.
According to the invention described in claim 8, by stopping the cooling fan, it is possible to prevent the deviation of the punching position due to the unintended behavior of the paper during the punching operation.

1 is a schematic configuration diagram of an image forming apparatus according to an embodiment of the present invention. FIG. 3 is a diagram illustrating a sheet conveyance path of the image forming apparatus. It is a figure which shows the operation | movement in the case of printing an image on the single side | surface of a paper, and is a figure which shows the state in a printing position. It is a figure which shows operation | movement in the case of printing an image on the single side | surface of a paper, and is a figure which shows a discharge state. It is a figure which shows a structure when an additional paper discharge unit is attached. It is a figure which shows the movement of a paper when the paper printed on one side is post-processed, and is a figure which shows the state in a printing position. It is a figure which shows the movement of a paper when the paper printed on one side is post-processed, and is a figure which shows the state currently conveyed in the inside of a post-processing apparatus. It is a figure which shows the movement of a paper when the paper printed on one side is post-processed, and is a figure which shows the loading state at the time of shift mode. It is a figure which shows the movement of a paper when the paper printed on one side is post-processed, and is a figure which shows the state at the time of a staple mode. It is a figure which shows a structure when the drilling unit is mounted | worn with the post-processing apparatus. It is a control block diagram of a post-processing apparatus. It is a control block diagram when the perforation unit is attached to the post-processing apparatus. It is a figure which shows the target speed which drives a DC motor. It is a wave form diagram of an actual operation | movement at the time of moving a DC motor and conveying a cardboard. It is a wave form diagram of actual operation | movement at the time of moving a DC motor and conveying thin paper. It is a wave form diagram which shows the magnitude | size difference with respect to target speed. 6 is a flowchart illustrating a sheet thickness determination operation. It is a figure which shows the drive speed of the DC motor during paper conveyance. It is a figure which shows the target speed which drives a DC motor. It is a wave form diagram of an actual operation | movement at the time of moving a DC motor and conveying a cardboard. It is a wave form diagram regarding the high-speed drive of a DC motor. It is a wave form diagram which shows the variation | change_quantity at the time of the high-speed drive of a DC motor. 6 is a flowchart illustrating a sheet thickness determination operation. It is a flowchart which shows an example of control operation. It is a flowchart which shows the other example of control operation. It is a flowchart which shows the other example of control operation. FIG. 6 is a characteristic diagram illustrating a relationship between a sheet thickness and an air volume of a fan motor. It is a flowchart which shows the other example of control operation. It is a characteristic figure which shows transition of punching time with respect to paper thickness (piercing | loading load). It is a flowchart which shows an example of control operation in the case of having a perforation unit. It is a flowchart which shows the other example of control operation in the case of having a perforation unit.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows an outline of the configuration of the image forming apparatus according to the present embodiment. The image forming apparatus includes a paper feeding unit A, an image forming unit B, and an image reading unit C. A space for storing paper as a recording medium printed by the image forming unit B below the image reading unit C. That is, there is a sheet storage portion D, and the sheet storage portion D is provided with a stacking means D-1 for stacking sheets.
FIG. 2 shows a sheet conveyance path of the image forming apparatus. In the paper transport path, the paper is discharged onto a pair of transport rollers 1, 2, 5, 7, 8, 9 serving as transport means, printing means 3 for printing an image on the paper, and stacking means D-1 of the paper storage unit D. A pair of paper discharge rollers 4 for rotating, a pair of reversing rollers 6 rotating in the forward and reverse directions when reversing the paper, and switching means t1 to t3 for switching the paper transport path are provided.
The printing unit 3 has a known configuration in which an electrostatic latent image formed on an image carrier is visualized as a toner image by a developing unit, and the toner image is transferred to a sheet by a transfer unit.

The operation when printing an image on one side of the paper is shown in FIGS. Image information is acquired from the outside or from the image reading unit C, and the sheet S1 is conveyed from the sheet bundle S of the sheet feeding unit A to the image forming unit B as shown in FIG. The printing means 3 performs a printing process based on the image information. Next, as shown in FIG. 4, the sheet S1 having an image printed on one side is sent to the sheet discharge path by the switching unit t1, and is discharged onto the stacking unit D-1 of the sheet storage unit D by the sheet discharge roller pair 4. The
FIG. 5 shows a configuration when the additional paper discharge unit D-2 is installed. The additional paper discharge unit D-2 is provided with a paper discharge roller pair 10 and a stacking means, and the additional paper discharge unit D-2 should be added downstream of the reverse roller pair 6 of the paper storage unit D of the image forming apparatus. Can do.
As a result, when the paper is reversed during duplex printing or when the right tray is ejected, the reverse roller pair 6 and the paper discharge roller pair 10 perform the same operation, and the paper can be reversed by receiving the paper on the stacking means. Further, by setting the paper discharge destination as the additional unit D-2, the additional paper discharge unit D-2 can be set and used as a different paper discharge destination from the stacking means D-1 which is a normal paper discharge destination. it can.

The movement of the sheet when the single-sided printed sheet is post-processed is shown in FIGS. As shown in FIG. 6, the sheet S1 on which the image is printed by the printing unit 3 in the image forming unit B is sent to the paper discharge path by the switching unit t1, and is sent to the post-processing device F by the paper discharge roller pair 4. Be transported. In the post-processing apparatus F, as shown in FIG. 7, it is transported in the post-processing apparatus by the transport roller pairs 11 to 13, and in the shift mode, the paper discharge roller pair 14 as shown in FIG. To be loaded.
In the staple mode, as shown in FIG. 9, the sheets are stacked on the stacking unit 50 as a temporary processing tray, and the selected post-processing is performed. After the post-processing, the paper is discharged onto the paper stacking means by the paper discharge roller pair 14.
A perforation unit P can be attached to the post-processing apparatus F, and the perforation unit P is connected in front of the post-processing apparatus F (upstream in the transport direction) as shown in FIG. During the punching operation, the paper is stopped and the press pin 15 is lowered from above the paper to perform the punching.

FIG. 11 shows a control unit of the post-processing apparatus F.
Driving units (conveyance driving unit 22, fan driving unit 23) for operating each motor (conveyance DC motor 20, fan motor 21), and control means (conveying control unit 24) for controlling the driving unit and instructing the operation of the motor. Fan control means 25). The post-processing device F is provided with a cooling fan (not shown) driven by the fan motor 21.
The cooling fan is installed in consideration of a position where the paper can be directly cooled before the paper is stacked, or a position where heat can be removed from the paper by cooling the member that guides the conveyance of the paper. It is determined appropriately.
From the speed detected by the transport motor detecting means 26 for detecting the speed of the transport DC motor 20, the speed fluctuation detecting means 27 calculates the comparison result with the target speed as the speed fluctuation, and the paper thickness determining means 28 based on the calculated result. The sheet thickness is determined, and the fan control means 25 performs control according to the determined sheet thickness.

FIG. 12 shows a control unit when the punching unit P is attached to the post-processing apparatus F.
A perforation drive unit 30 for operating the perforation DC motor 29 and a perforation control means 31 for controlling the drive unit and instructing the operation of the motor are provided. Depending on the perforation time detected by the perforation time detection means 32 for detecting the time until the perforation DC motor 29 completes perforation and the result of the speed fluctuation calculated by the speed fluctuation detection means 27, the paper thickness determination means 28 determines the paper thickness. The fan control means 25 performs control according to the determined sheet thickness.

13 to 15 show waveforms relating to constant speed driving of the DC motor. FIG. 13 shows a target speed for driving the DC motor, FIG. 14 shows an actual operation waveform when the DC motor is moved to convey thick paper, and FIG. 15 shows an example of an actual operation waveform when the DC motor is moved to convey thin paper. It is.
When FIG. 13 is compared with FIG. 14 or FIG. 15, the actual operation speed varies with respect to the target speed.
Next, comparing FIG. 14 and FIG. 15, it can be seen that the number of times that a large difference occurs with respect to the target speed is greater in the waveform in which the thick paper is conveyed. A large difference with respect to the target speed is that the speed fluctuates outside the range of the dotted line shown in FIG. 16, and the number of speed fluctuations is large for thick paper and small for thin paper. In FIG. 16, it is 5 times. Using this characteristic, the paper thickness of the paper being conveyed is determined.

The sheet thickness determination operation will be described with reference to the flowchart of FIG.
First, discharge to the post-processing apparatus is set (step S1, hereinafter simply referred to as “S1”). When the image-formed paper is transported to the post-processing device (S2) and the paper reaches the transport path of the post-processing device (S3), measurement of speed fluctuation of the paper transport driving is started (S4).
The conveyance drive speed is monitored as needed (S5), and if there is a speed fluctuation, the process proceeds to S6. If there is no speed fluctuation, the process proceeds to S7.
If there is a speed fluctuation, the number n of speed fluctuations is counted (S6). It is determined whether a certain time has elapsed from the start of measurement (S7). If the certain time has elapsed, the process proceeds to S8. If the predetermined time has not elapsed, the process proceeds to S5.
When the speed fluctuation measurement of the paper conveyance drive is completed (S8), it is determined whether the number n of speed fluctuation measurement has reached N times (S9). If the number of measurements is N or more, the process proceeds to S10. If the number of times of measurement is less than N, the process proceeds to the next sheet.
If the number of times of measurement is N or more, the control of the cooling fan is changed (S10), and then the process proceeds to the next sheet.

FIG. 18 is a diagram showing the driving speed of the DC motor during sheet conveyance. Two types of speeds are switched and used during sheet conveyance as in the low speed driving and the high speed driving in the figure.
19 to 21 show waveforms relating to high-speed driving of the DC motor shown in FIG. FIG. 19 shows a target speed for driving the DC motor, FIG. 20 shows an actual operation waveform when the DC motor is moved to transport thick paper, and FIG. 21 shows an example of an actual operation waveform when the DC motor is moved to transport thin paper. It is.
Comparison of FIG. 19 with FIG. 20 or FIG. 21 shows that the actual operation speed varies with respect to the target speed.
Next, when FIG. 20 is compared with FIG. 21, the speed of the waveform in which the thick paper is conveyed fluctuates more greatly in the vertical direction than the waveform in which the thin paper is conveyed. Since the maximum fluctuation occurs within a certain time from the start of high-speed driving, the thickness of the paper being conveyed is determined using the characteristic of the maximum fluctuation.

As shown in FIG. 22, the fluctuation in speed is calculated as a fluctuation amount V2 from the target speed V0 and the actual operation speed VA.
The sheet thickness determination operation will be described with reference to the flowchart of FIG.
Discharge to the post-processing apparatus is set (S1). When the image-formed paper is transported to the post-processing device (S2) and the paper reaches the transport path of the post-processing device (S3), the transport driving is started at high speed (S4), and the speed of the paper transport driving is changed. Measurement is started (S5).
The speed of the conveyance drive is monitored as needed (S6). If there is a speed fluctuation, the process proceeds to step S7, and if there is no speed fluctuation, the process proceeds to step S10.
The fluctuation amount (V2) of the speed fluctuation determined in S6 is calculated (S7), and the previous fluctuation amount (V1) is compared with V2 (S8).
If V1 ≦ V2 (this is always the case for the first change), the process proceeds to step S9, and if V1> V2, the process proceeds to step S10.
When V1 ≦ V2, the value of V2 is substituted into V1 (S9), and it is determined whether a certain time has elapsed from the start of measurement (S10). If the fixed time has elapsed, the process proceeds to step S11. If the fixed time has not elapsed, the process proceeds to step S6.
If the predetermined time has elapsed, the measurement of the speed variation of the paper conveyance drive is finished (S11), the control of the cooling fan is changed (S12), and the process proceeds to the next paper processing.

A specific control operation will be described based on FIG.
Discharge to the post-processing apparatus is set (S1). When the image-formed paper is transported to the post-processing device (S2) and the paper reaches the transport path of the post-processing device (S3), the transport driving is started at high speed (S4), and the speed variation of the paper transport driving is changed. Measurement is started (S5).
The speed of the conveyance drive is monitored as needed (S6). If there is a speed fluctuation, the process proceeds to step S7, and if there is no speed fluctuation, the process proceeds to step S10.
A fluctuation amount (V2) of the speed fluctuation determined in step S6 is calculated (S7). If the speed fluctuation is the second time or later, the previous fluctuation amount (V1) is compared with V2 ′ (S8). If V1 ≦ V2, the process proceeds to step S9. If V1> V2, the process proceeds to step S10. move on.
The value of V2 is substituted into V1 (S9), and it is determined whether or not a certain time has elapsed from the start of measurement (S10). If the fixed time has elapsed, the process proceeds to step S11. If the fixed time has not elapsed, the process proceeds to step S6.
When the predetermined time has elapsed, the measurement of the speed fluctuation of the paper conveyance drive is ended (S11).
The magnitudes of the specified value (V) and the speed fluctuation (V1) are compared (S12). If V> V1, the process proceeds to step S13. When V ≦ V1, the cooling fan control is not changed.
If V> V1, the air flow of the cooling fan is limited (S13), and the process proceeds to the next sheet.

Based on FIG. 25, another example of a specific control operation will be described.
Discharge to the post-processing apparatus is set (S1). When the image-formed paper is transported to the post-processing device (S2) and the paper reaches the transport path of the post-processing device (S3), the transport driving is started at high speed (S4), and the speed variation of the paper transport driving is changed. Measurement is started (S5).
The speed of the conveyance drive is monitored as needed (S6). If there is a speed fluctuation, the process proceeds to step S7, and if there is no speed fluctuation, the process proceeds to step S12.
The fluctuation amount (V2) of the speed fluctuation determined in step S6 is calculated (S7), and the magnitude of the specified value (V) and the speed fluctuation (V2) is compared (S8). If V ≦ V2, the process proceeds to step S9. If V> V2, the process proceeds to step S10.
If V ≦ V2, the air volume of the cooling fan is increased (S9).
If the speed fluctuation is after the second time, the previous fluctuation amount (V1) is compared with V2 ′ (S10). If V1 ≦ V2, the process proceeds to step S11. If V1> V2, the process proceeds to step S12. move on.
When V1 ≦ V2, the value of V2 is substituted into V1 (S11), and it is determined whether a certain time has elapsed from the start of measurement (S12). If the fixed time has elapsed, the process proceeds to step S13, and if the fixed time has not elapsed, the process proceeds to step S6.
If the predetermined time has elapsed, the measurement of the speed fluctuation of the paper conveyance drive is ended (S13). The magnitudes of the specified value (V) and the speed fluctuation (V1) are compared (S14). If V> V1, the process proceeds to step S15. If V ≦ V1, the cooling fan control is not changed.
If V> V1, the air flow of the cooling fan is limited (S15), and then the process proceeds to the next sheet.

Another example of the specific control operation will be described based on FIG.
Discharge to the post-processing apparatus is set (S1). When the image-formed paper is transported to the post-processing device (S2) and the paper reaches the transport path of the post-processing device (S3), the transport driving is started at high speed (S4), and the speed variation of the paper transport driving is changed. Measurement is started (S5).
The speed of the conveyance drive is monitored as needed (S6). If there is a speed fluctuation, the process proceeds to step S7, and if there is no speed fluctuation, the process proceeds to step S10.
The fluctuation amount (V2) of the speed fluctuation determined in S6 is calculated (S7), and if the speed fluctuation is the second time or later, the previous fluctuation quantity (V1) is compared with V2 ′ (S8).
When V1 ≦ V2, the process proceeds to step S9, and when V1> V2, the process proceeds to step S10. The value of V2 is substituted for V1 (S9), and it is determined whether or not a certain time has elapsed from the start of measurement (S10).
If the fixed time has elapsed, the process proceeds to step S11. If the fixed time has not elapsed, the process proceeds to step S6. If the predetermined time has elapsed, the measurement of the speed fluctuation of the paper conveyance drive is ended (S11).
The prescribed value (V) and the speed fluctuation (V1) are compared (S12). If V> V1, the process proceeds to step S13. If V ≦ V1, the cooling fan control is not changed.
When V> V1, the cooling fan air volume is limited (S13). When the paper reaches the paper discharge position (S14), the cooling fan is stopped (step S15). Thereafter, the processing proceeds to the next sheet.

FIG. 27 is a diagram showing the relationship between the sheet thickness and the air volume of the fan motor. The dotted line in the figure shows the case where control is performed to adjust the air volume of the fan motor, considering the thickness as a group, and it is controlled according to the thin paper in the group. Paper is not an appropriate control.
The solid line in the figure shows the case where the control is performed so that the thickness and the air volume of the fan motor are in a proportional relationship, and the most appropriate control can be performed on the determined sheet thickness.
For example, when the calculated paper thickness is TP and the fan motor airflow (rotation speed) is S, the determination formula of the airflow is:
S = (a × TP) + b
Calculate as

Based on FIG. 28, the operation | movement flow at the time of applying the said control to the control of Claim 2 is demonstrated.
Discharge to the post-processing apparatus is set (S1). When the image-formed paper is transported to the post-processing device (S2) and the paper reaches the transport path of the post-processing device (S3), the transport driving is started at high speed (S4), and the speed variation of the paper transport driving is changed. Measurement is started (S5).
The speed of the conveyance drive is monitored as needed (S6). If there is a speed fluctuation, the process proceeds to step S7, and if there is no speed fluctuation, the process proceeds to step S10.
If there is a speed variation, the variation amount (V2) of the velocity variation determined in step S6 is calculated (S7), and the previous variation amount (V1) is compared with V2 (S8).
If V1 ≦ V2 (this is always the case for the first variation), the process proceeds to step S9. If V1> V2, the process proceeds to step S10.
When V1 ≦ V2, the value of V2 is substituted for V1 (S9), and it is determined whether or not a certain time has elapsed from the start of measurement (S10). If the fixed time has elapsed, the process proceeds to step S11. If the fixed time has not elapsed, the process proceeds to step S6.
When the predetermined time has elapsed, the measurement of the speed variation of the paper conveyance drive is finished (S11), the paper thickness TP is determined according to the value of V1, and the appropriate air volume S of the fan motor is determined (S12).
The control of the cooling fan is changed to the air volume calculated in S12 (S13), and the process proceeds to the next sheet processing.

FIG. 29 shows the transition of perforation time with respect to the paper thickness (perforation load). There is almost no change between the case where there is no paper (idle in FIG. 29) and the case of thin paper. It can be seen that the drilling time tends to increase.
As an example, the dotted line in FIG. 29 is considered as a prescribed value T of the drilling time. Using this characteristic, the paper thickness of the paper being conveyed is determined.

Based on FIG. 30, the operation | movement flow in the case of having a perforation unit is demonstrated.
Discharge to the post-processing apparatus is set (S1). When the image-formed paper is transported to the post-processing device (S2) and the paper reaches the transport path of the post-processing device (S3), paper punching processing is started (S4), and punching time measurement is started. (S5).
When the measurement of the punching time is finished (S6) and the punching process of the paper is finished (S7), the conveyance drive is started at a high speed (S8).
The specified time T is compared with the measured perforation time t (S9). If t ≧ T, the paper is determined to be cardboard, and the process proceeds to step S10. If t <T, the process proceeds to step S11. If t ≧ T, the air flow of the cooling fan is increased (S10), and the process proceeds to the next sheet processing.

When t <T, measurement of the speed fluctuation of the paper transport drive is started (S11), and the speed of the transport drive is monitored as needed (S12). If there is a speed fluctuation, the process proceeds to step S13, and if there is no speed fluctuation, the process proceeds to step S16.
If there is a speed fluctuation, the speed fluctuation amount (V2) determined in step S6 is calculated (step S13). If the speed fluctuation is after the second time, the previous fluctuation amount (V1) and V2 ′ are compared (S14). If V1 ≦ V2, the process proceeds to step S15. If V1> V2, the process proceeds to step S16. move on.
In the case of V1 ≦ V2, the value of V2 is substituted for V1 (S15), and it is determined whether or not a certain time has elapsed from the start of measurement (S16). If the fixed time has elapsed, the process proceeds to step S17, and if the fixed time has not elapsed, the process proceeds to step S12.
If the predetermined time has elapsed, the measurement of the speed fluctuation of the paper conveyance drive is finished (S17), and the magnitude of the specified value (V) and the speed fluctuation (V1) are compared (S18).
If V> V1, the process proceeds to step S19. If V ≦ V1, the control of the cooling fan is not changed. If V> V1, the air flow rate of the cooling fan is limited (S19), and the process proceeds to the next sheet.

Based on FIG. 30, the other example of the operation | movement flow in the case of having a perforation unit is demonstrated.
Discharge to the post-processing apparatus is set (S1). When the image-formed paper is transported to the post-processing device (S2) and the paper reaches the transport path of the post-processing device (S3), the cooling fan is stopped (S4), and the paper punching process is started. (S5) The measurement of the drilling time is started (S6).
When measurement of the punching time is finished (S7) and the punching process of the paper is finished (S8), the cooling fan is restarted (S9).
The conveyance drive is started at a high speed (S10), and the specified time T is compared with the measured perforation time t (S11). If t ≧ T, it is determined that the paper is thick and the process proceeds to step S12. If t <T, the process proceeds to step S13.
If it is determined that the paper is thick, the air flow of the cooling fan is increased (S12), and the process proceeds to the next paper.

When t <T, measurement of the speed fluctuation of the paper transport drive is started (S13), and the speed of the transport drive is monitored as needed (S14). If there is a speed fluctuation, the process proceeds to step S15, and if there is no speed fluctuation, the process proceeds to step S18.
If there is a speed fluctuation, the speed fluctuation amount (V2) determined in S6 is calculated (S15). If the speed fluctuation is the second time or later, the previous fluctuation amount (V1) is compared with V2 ′ (S16). If V1 ≦ V2, the process proceeds to step S17. If V1> V2, the process proceeds to step S18. move on.
In the case of V1 ≦ V2, the value of V2 is substituted for V1 (S17), and it is determined whether or not a certain time has elapsed from the start of measurement (S18). If the fixed time has elapsed, the process proceeds to step S19. If the fixed time has not elapsed, the process proceeds to step S14.
If the predetermined time has elapsed, the measurement of the speed fluctuation of the paper transport drive is finished (S19), and the magnitude of the specified value (V) and the speed fluctuation (V1) are compared (S20). If V> V1, the process proceeds to step S21. If V ≦ V1, the cooling fan control is not changed.
If V> V1, the air flow of the cooling fan is limited (S21), and the process proceeds to the next sheet.

DESCRIPTION OF SYMBOLS 20 Conveyance DC motor as drive source 22 Conveyance drive part 23 Fan drive part 24 Conveyance control means 25 Fan control means 29 Perforation DC motor as a perforation part 30 Perforation drive part 31 Perforation control means F Post-processing apparatus

JP 2007-079310 A

Claims (9)

  1. A conveyance path for sequentially receiving sheet-like recording media discharged from the image forming apparatus and conveying the recording medium to a post-processing unit;
    A transport drive unit for operating a drive source for transporting the recording medium;
    A transport control means for controlling the transport driving unit;
    A processing tray for temporarily loading the recording medium from the transport path;
    A post-processing unit that performs post-processing on the recording medium on the processing tray;
    A cooling fan for cooling the recording medium;
    A fan driving unit for operating the cooling fan;
    Fan control means for controlling the fan drive unit;
    In an aftertreatment device comprising:
    The drive source for transporting the recording medium is a DC motor, and the thickness of the recording medium is determined from the speed fluctuation with respect to the target speed of the DC motor during the recording medium transport in the transport path, and according to the determination result Then, the post-processing apparatus is characterized in that the drive control of the cooling fan is changed.
  2. The post-processing apparatus according to claim 1, wherein
    In the conveyance of the recording medium by the conveyance driving unit, when there are at least two kinds of driving speeds, the detection timing of the speed fluctuation with respect to the target speed of the DC motor is set to the time of conveying the recording medium by high speed driving. Post-processing device to do.
  3. The post-processing apparatus according to claim 1 or 2,
    The post-processing apparatus, wherein when it is determined that the recording medium is thin as a result of the thickness determination of the recording medium, the air volume of the cooling fan is made smaller than usual.
  4. The post-processing apparatus according to claim 1 or 2,
    A post-processing device, wherein when the recording medium thickness is determined to be thick even once as a result of determining the thickness of the recording medium, the air flow rate of the cooling fan is increased more than usual.
  5. The post-processing apparatus according to claim 3, wherein
    The post-processing apparatus is characterized in that the control of the cooling fan is switched at least twice or more depending on the position of the recording medium.
  6. The post-processing apparatus according to any one of claims 1 to 5,
    A post-processing apparatus, wherein the control of the cooling fan is changed based on a result of the thickness determination of the recording medium so that the thickness of the recording medium and the air flow rate of the cooling fan are in a proportional relationship.
  7. The post-processing apparatus according to claim 1 or 2,
    A punching unit including a punching unit that punches a recording medium on the transport path, a punching drive unit that drives the punching unit, and a punching control unit that controls the punching drive unit;
    According to either one of the determination result of the recording medium thickness based on the speed fluctuation of the DC motor and the determination result of the recording medium thickness based on the punching time in the punching drive unit, the cooling fan A post-processing apparatus characterized by changing control.
  8. The post-processing apparatus according to claim 7,
    The post-processing apparatus is characterized in that, during the punching in the punching unit, the cooling fan is stopped regardless of the thickness determination result of the recording medium.
  9.   An image forming apparatus comprising the post-processing device according to claim 1 integrally or detachably.
JP2011049462A 2011-03-07 2011-03-07 Post-processing apparatus and image forming apparatus Active JP5703858B2 (en)

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