JP2001293691A - Punch chip detection device for punching device and image forming device provided with this device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To always detect a loading height of a punch chip at the same height in no relation to the number of apertures provided on a sheet. SOLUTION: This punch chip detection device 69 for a punching device of the present invention detects a loading height of a punch chip 67a (or 67b) generated at the time of punching action of a punching device 2 for providing a plurality of apertures on a member to be punched by a plurality of punches 47 straightly arranged and a die aperture 50a (or 50b) of a die 50 opposed to the punch 47. A loading height detection means 66 for detecting the punch chip by a transmitting light along an arrangement direction of the punch and the die aperture is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punch chip detecting device for detecting a stacking height of punch chips generated from a punching device for forming a hole in a member to be punched, a punch device and a punch chip detecting device for the punch device. The present invention relates to an image forming apparatus such as a copying machine, a printer, a facsimile, and a multifunction device including the same.

[0002]

2. Description of the Related Art A punching device that generates punch dust is provided, for example, as a post-processing device in a main body of an image forming apparatus, and filing is performed on a sheet as a perforated member on which an image is formed in the main body of the image forming apparatus. The hole for the hole is made. In addition to the punching device, the post-processing device includes a sorter for sorting sheets on which images have been formed, a binding device for binding a bundle of sheets, a folding device for folding a bundle of sheets, and the like.

[0003] As shown in Figs. 8 and 9, the punching device 137 can cope with a case where two holes are formed and a case where three holes are formed in the sheet S according to specifications. . When the specification is to make two holes, 2
By providing the drive shaft 138 having the two punch portions 142, 142, the two punch portions 142, 142 and the die holes 144, 144 can make two holes in the sheet. Also, when the specification is to make three holes, three punches 14
By equipping the drive shaft 139 with 3,143,143, three holes can be formed in the sheet by the three punch portions 143,143,143 and the die holes 145,145,145. ing.

[0004] The punch dust 167 of the perforated sheet is received by a dust box 158 disposed below the punch portion and stacked in a mountain shape.

When the loaded height of the loaded punch dust 167 reaches a predetermined height, the reflection sensor 1 is a punch dust detection device that irradiates light from a direction intersecting the drive shaft 138.
66, the height is detected, and the punch waste 167 is detected.
Users are informed that is full.

[0006] The reflection sensor 166 includes a light emitting section 166a for irradiating light to a prism 168 facing the reflection sensor 166.
And a light receiving unit 16 for receiving light reflected by the prism 168
6b. Therefore, when the stacking height of the punch dust 167 reaches a predetermined height, the light from the light emitting unit 166a is blocked by the punch dust 167, cannot reach the prism 168, and can be received by the light receiving unit 166b. Can not. Thereby, the reflection sensor 166 detects that the sheet punch waste 167 has reached a predetermined height in the dust box and is fully loaded.

[0007]

However, the conventional reflection sensor 166 has the problem that the punch dust 16 in the dust box 158 is removed.
7 is detected by irradiating light from a direction intersecting the drive shaft 138, the following problem may occur.

[0008] As in the case of the above-described punching device 137, if the sheet is designed to correspond to a specification in which one of two holes and three holes is made, two holes are formed in the sheet by the two-hole punch portion 142. And 3 at the 3-hole punch 143
The place where the punch dust 167 falls is different from when one hole is drilled. That is, the punch waste in the case of two holes forms two peaks as indicated by reference numeral 167a.
Then, the punch dust in the case of three holes forms three peaks as indicated by reference numeral 167b.

For this reason, the reflection sensor 166 detects that the punch dust 16
When it is detected that the punch 167a is full due to light being shielded by the valley of the mountain 7a, and three holes are formed in the sheet, the light is shaded at the top of the mountain of the punch 167b to form the punch 167.
That is, it is detected that b is full. Therefore, the full amount of punch dust detected by the reflection sensor 166 differs depending on the number of holes formed in the sheet. If two holes are formed in the sheet, the punch dust 167a may overflow from the dust box 158. In addition,
Such a problem is not limited to two holes and three holes, and a similar problem occurs between other numbers of holes.

In order to cope with such a problem, an eccentric cam 170 fixed to a drive shaft 169 is provided below the dust box 158, and the eccentric cam 170 is brought into contact with a bottom 158a of the dust box 158 and rotated to rotate the dust box. By applying vibration to 158,
The pile of 67 was flattened, and the stacking height of the punch dust was detected regardless of the number of holes formed in the sheet.

However, according to this method, the structure becomes complicated, the assembly becomes difficult, and the cost increases.
Further, there is a possibility that another problem that vibration noise is generated and a failure occurs in each part due to the vibration.

Further, when the conventional punching device 137 returns the dust box 158 to the main body 171 of the punching device 137 after discarding the punch dust 167 in the dust box,
If the dust box 158 is not securely attached to the main body 171, the punch dust 167 may be placed beside the dust box 158.
May fall. For this reason, dust box 1
It was necessary to provide a sensor (not shown) for detecting whether or not 58 was securely attached to the main body 171, separately from the reflection sensor 166.

(Purpose) The present invention relates to a punch dust detecting device for a punching device which can always detect the stacking height of punch dust at the same height regardless of the number of holes formed in a sheet. It is an object to provide an image forming apparatus having the same.

[0014]

In order to achieve the above object, a punch dust detecting device for a punching device according to the present invention is covered by a plurality of punches arranged in a straight line and a die hole of a die facing the punch. In a punch dust detecting device for a punching device for detecting a stacking height of punch dust generated at the time of a punching operation of a punching device for punching a plurality of holes in a punching member, the transmitted light along the arrangement direction of the punch and die holes is used to detect the A loading height detecting means for detecting punch dust is provided.

According to the present invention, there is provided a punch dust detecting device for a punching device.
The punching device has a dust box for storing the punch dust detachably in a direction intersecting the transmission direction of the transmitted light, and a passage that allows the transmission of the transmitted light when the dust box is mounted at a mounting position. An allowance portion is formed in the dust box, and the loading height detecting means detects whether or not the transmitted light passes through the pass allowance portion, so that the attachment / detachment of the dust box can also be detected.

According to the present invention, there is provided a punch dust detecting device for a punching device.
The punching device has a dust box for accommodating the punch dust detachably in a direction intersecting with the transmission direction of the transmitted light, and has a displaceable blocking member that blocks the transmitted light when the dust box is taken out. The loading height detecting means detects whether or not the transmitted light passes without being blocked by the blocking member, so that the attachment / detachment of the dust box can be detected.

According to the present invention, there is provided a punch dust detecting device for a punching device.
The punching device has a dust box for accommodating the punch dust detachably in a direction intersecting with the transmission direction of the transmitted light, and has a displaceable blocking member that blocks the transmitted light when the dust box is taken out. When the dust box is mounted at the mounting position, a pass permitting portion that allows the transmission of the transmitted light is formed in the dust box, and the transmitted light passes through the pass permitting portion without being blocked by the blocking member. The loading height detecting means detects whether or not the dust box is mounted, so that the attachment / detachment of the dust box can also be detected.

To achieve the above object, an image forming apparatus according to the present invention comprises: an image forming means for forming an image on a member to be pierced;
The punching device according to any one of claims 1 to 4, wherein a punching device that punches a hole in the member to be punched on which the image is formed, and a stacking height of punch waste generated from the punching device are detected. And a punch waste detection device, wherein the perforated member is a sheet.

(Operation) The punch dust detecting device for a punching device according to the present invention detects the height of punch dust generated during a punching operation between a punch and a die hole of the punching device. Punch waste is loaded below the punch. For this reason, the punch dust forms peaks in a number corresponding to the number of punches. The plurality of peaks are formed to be linearly arranged corresponding to the punches arranged linearly. When a predetermined amount of punch chips is stacked and reaches a certain height, the stacking height detecting means detects the punch chips. The loading height detection means transmits the light from the arrangement direction of the punch and the die holes to detect the punch dust, so that the light transmission direction matches the arrangement direction of the pile of the punch dust,
The peak of the pile of punch waste is detected.

For this reason, even if the number of punches is changed and the number of peaks formed by the punch dust changes, the loading height detecting means always detects the peak of the peak of the punch dust and the sheet height. It is detected that the stacking height of the punch dust reaches a predetermined height without being affected by the number of punches that make holes.

The punch dust may be stored in a dust box. In this case, a permissible portion through which the transmitted light of the loading height detection means passes is formed in the dust box, and the transmitted light passes through the permissible portion to detect the loading height of the punch dust. The punch dust that has reached a predetermined loading height in the dust box and has been fully loaded is removed from the punching device and discarded. When the dust box is returned to the original position, if the dust box is not securely returned to the predetermined position, the passage permitting portion cannot face the loading height detecting means. For this reason, the transmitted light is blocked by the dust box, and the loading height detection unit detects that the dust box has not been returned to the predetermined position. As described above, by forming the permeation permitted portion of the transmitted light in the dust box, the stacking height detecting means can detect not only the height of the punch dust but also the attachment / detachment of the dust box. But in this case,
The user removes the dust box from the punch and
If the punching device is started forgotten to return, the loaded height detecting means will erroneously detect that the dust box is returned to the predetermined position without blocking the transmitted light.

Therefore, if a blocking member for blocking the transmitted light when the dust box is taken out of the punching device is displaceably provided, it is possible to cope with forgetting to return the dust box. That is, when the dust box is installed at a predetermined position, the blocking member is displaced to the predetermined position by the dust box and does not block transmitted light. However, if the punch waste is discarded and the dust box is forgotten to be returned, or if the dust box is not securely returned to the predetermined position, the transmitted light is blocked without displacing the blocking member to the predetermined position. Thus, the loading height detection unit detects that the dust box has not returned to its original position. As described above, by providing the blocking member for blocking the transmitted light when the dust box is taken out in the perforating device so as to be displaceable, the loading height detecting means can detect not only the height of the punch dust but also the attachment / detachment of the dust box. Become like

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic overall configuration diagram of a copying machine 100 which is an image forming apparatus according to the present embodiment. FIG. 2 is a sectional view of the punching device 2 as viewed from the front of the copying machine 100 of FIG. FIG. 3 is a sectional view taken along the line AA of FIG. FIG. 4 is a perspective view of the punch and the die. FIG. 5 is a diagram for explaining the punching operation.

(Copying Machine) As shown in FIG. 1, a copying machine (image forming apparatus) 100 according to an embodiment of the present invention
And a punching device 2 and a post-processing device 3.
The punching device 2 is one type of the post-processing device 3 located between the copying machine main body 1 and the post-processing device 3. The punching device 2 and the post-processing device 3 constitute a post-processing unit 99.

The copying machine 100 is an electrophotographic copying machine. An image reading section 4 is provided at an upper portion of the main body 1 and a feeding section 5 is provided at a lower portion.
An image forming unit (image forming means) 6 is provided at the center, and further,
In the vicinity of the feeding section 5, there is provided a double-sided unit 7 for reversing and re-supplying the sheet once passed through the image forming section 6.

The image reading section 4 scans the original placed on the platen glass 8 while irradiating the original with light by the optical means 9, and reads the image of the original by the reflected light. A platen glass 8 is provided above the image reading unit 4.
A document feeder 10 that holds a placed document and automatically feeds a plurality of documents is provided above the document feeder 10.

The paper supply unit 5 has a plurality of cassettes 11 for stacking sheets of different sizes, and supplies the sheets in the cassette 11 to the image forming unit 6 while separating the sheets one by one by a paper supply unit 12. It has become. The supplied sheet is temporarily stopped by a pair of registration rollers 13 arranged on the upstream side of the photosensitive drum 14, and the skew is corrected by forming a loop, and the sheet is synchronized with the photosensitive drum 14. Transport is resumed.

The surface of the photoreceptor drum 14 is uniformly charged by the charging means 15, and forms an electrostatic latent image when irradiated with light from the optical means 16. An image is formed. The toner image is transferred to the conveyed sheet by the transfer unit 18. The toner remaining on the photosensitive drum 14 after the transfer is
It is removed by the cleaning device 19 and used for the next image formation.

The sheet on which the toner image has been transferred is conveyed to the fixing device 21 by the conveying means 20, and heat and pressure are applied by the fixing device 21. The toner image melts on the sheet,
Be established. When image formation is performed only on one side of the sheet, the sheet is left as it is, and the sheet discharge roller pair 5
The wafer 4 is conveyed to the punching device 2 and the post-processing device 3 by the same.
When forming an image on both sides, the image is conveyed to the duplex unit 7 and an image is formed on the other side by the image forming unit 6.

(Post-Processing Apparatus) The post-processing apparatus 3 is an apparatus for performing a predetermined post-processing on a sheet after image formation, and has a sort function and a stapler 2 for binding a sheet bundle.
2. It has folding means 23 for folding the sheet bundle.

The sorting function means that the first sheet conveyed to the post-processing device 3 is temporarily placed on the intermediate tray 27 by the knurl belt 26, and after the position in the width direction is regulated by a side guide (not shown). , Discharge roller 28
Is discharged onto the discharge tray 29 and loaded.
This function is that the copier body 1 can hold the image information of the entire sheet of the sheet bundle and can discharge the sheets in the page order, so that a plurality of sheets can be discharged to the single discharge tray 29.
Can now be sorted. Further, since the offset processing for shifting the first sheet bundle requires a time corresponding to the shift, the second sheet bundle is shifted to the flapper 24b.
Control to discharge to the buffer roller 25 and discharge the sheet together with the third sheet to be conveyed next.

The binding of the sheet bundle is performed by transporting the sheets to the intermediate tray 27 by the knurl belt 26.
, And when the number of sheets reaches a predetermined value, the stapler 2
2 by binding the sheet bundle. The bound sheet bundle is conveyed to a discharge roller 28 and discharged to a discharge tray 29. Also, when binding a sheet bundle, it takes time to bind the sheets. Therefore, the second sheet discharge control is also performed for the first and second sheets of the next sheet, and the sheets are discharged without waiting for the main body 1 to form an image. To improve throughput.

The process of folding the sheet bundle is such that the sheets are sequentially conveyed to the folding means 23 under the guidance of the flapper 24a, and when a predetermined number of sheets are accumulated and the sheets are bundled, a pushing plate is placed between the folding roller pair 23a. This is performed by making the sheet bundle bite by 23b. The folded sheet bundle is discharged to the stacking tray 30.

(Punching Process) The punching device 2
Is a device for punching holes in a sheet on which an image is formed in the main body 1 of the printer. The punching device 2 can be used alone without being provided in the main body of the copying machine. In this case, holes can be formed not only in the sheet but also in a wooden plate or a metal plate. Therefore, the perforating apparatus 2 is not designed to perforate only the sheet. Examples of the sheet include plain paper, resin-made substitutes for plain paper, and cardboard.

In FIG. 3, a motor 33 as a driving source is provided on a front side plate 31 in a housing 59 of the punching device 2. Motor gear 3 attached to shaft 33a of motor 33
Reference numeral 4 denotes a drive shaft 6 to be described later via a double gear 35 rotatably supported by a gear shaft 36 protruding from the front side plate 31.
The rotation is transmitted to a drive gear 37 fixed to the drive shaft 8 (or the drive shaft 38). The drive shaft 68 (or the drive shaft 38) is connected to the front side plate 31 by bearings 38a, 38a.
And is rotatably supported by the rear side plate 32.

[0036] The punching device 2 is provided with a sheet S according to specifications.
In addition, it is possible to cope with the case of drilling two holes and the case of drilling three holes. When the specification is to make two holes, two punch parts 4 indicated by broken lines
By assembling the drive shaft 68 provided with the two punch portions 42 and 42 and the die hole 50
a and 50a, two holes can be formed in the sheet. When the specification is such that three holes are formed, three punches 43, 43, 4
By equipping the drive shaft 38 provided with the three at the time of assembly, three holes can be formed in the sheet by the three punch portions 143, 143, 143 and the die holes 50b, 50b, 50b. .

The punch 42 for two holes will be described with reference to FIGS. The punch portion 42 is pivotally connected to a cam holder 45 fixed to the drive shaft 38, a cam holder 45 rotatably fitted on the outer periphery of the eccentric cam 44, and a cam shaft 45 by a support shaft 46. And a punch 47. A punching edge 47a is formed at the tip of the punch 47. The tip of the punch 47 is inserted into a punch guide 48 fixed and held by a frame body 49, and is slidably positioned. The punch 4 has a punch 4
A through-hole 48a through which 7 penetrates is formed. The frame body 49 also has a through hole 49a through which the punch 47 penetrates. The frame body 49 includes a front plate 31 and a rear plate 32.
It is hung between and. A die 50 is further stretched between the front side plate 31 and the rear side plate 32 at an interval necessary for the sheet to pass, facing the frame body 49. Therefore, between the frame body 49 and the die 50, a sheet conveying path 51 of a sheet to be punched is formed. The die 50 includes a punching edge 47 of the punch 47.
A two-hole die hole 50a engageable with the hole a is formed.

The structure of the two-hole punch 42 and the parts related thereto have been described above.
Since the same configuration as that of the two-hole punch portion 42 is used, the same reference numerals are given to the same portions, and the description of the portions will be omitted. The die 50b for three holes is also formed on the die 50. The sheet conveyance path 51 is provided with a sensor flag 52, and the presence or absence of a sheet can be detected by detecting the sensor flag 52 with the sheet detection sensor 53.

Therefore, when the drive shaft 68 is rotated from the state where the punch 47 is raised as shown in FIG.
As shown in FIG. 5B, the eccentric cam 44 rotates, and the cam holder 45 fitted on the outer periphery rotates around the support shaft 46. Then, the punch 47, the operation of which is regulated by the support shaft 46 and the punch guide 48, is pressed downward, and at the position where the drive shaft 68 is rotated half a turn, the punching edge 47a of the punch 47 is The hole is fitted in the hole 50a, and a hole is formed in the sheet. 5D, the eccentric cam 44 rotates the cam holder 45 about the support shaft 46 to retreat the punch 47 upward, as shown in FIG. 5D. Again, FIG. 5 (a)
Return to the standby position shown in. With this configuration, the cam 47 does not rattle and the punch 47
Can smoothly reciprocate. At one end of the drive shaft 68, a sensor flag 39 for detecting reciprocation of the punch 47 is provided. A sensor 40 (see FIG. 2) for detecting the sensor flag 39 and an encoder 41 are attached to the front side plate 31. The sensor 40 detects the notch 39a of the sensor flag 39,
1 and the control circuit 72 (see FIG. 3) manage the reciprocating operation of the punch 47.

When a hole is formed in the sheet, as shown in FIG. 2, the sheet on which an image has been formed in the copying machine body 1 is conveyed from the discharge roller pair 54 of the copying machine body 1 into the sheet punching device 2. . The sheet is conveyed along a sheet conveyance path 51 between the frame body 49 and the die 50, and the conveyance and the stay are detected by the sensor flag 52 and the sheet detection sensor 53. Then, the sheet passes through the sheet entrance conveyance path 55 of the post-processing device 3 and is conveyed to the sheet conveyance path 57 by the rotation of the conveyance roller pair 56. The sheet stops at a predetermined timing after the leading end is detected by the sheet detection sensor 53.

When the sheet stops, the punch 47 is moved to the die 5
The sheet is reciprocated with respect to 0 to make a hole in the sheet. Die 5
A dust box 58 is provided below 0, and punch dust generated by punching is received by the dust box 58. The dust box 58 can be put into and taken out of the housing 59 in a direction intersecting with a transmission direction of light transmitted by a transmission sensor 66 described later.

When the punching of the sheet is completed, the conveying roller pair 56 of the post-processing device 3 is rotated by a motor (not shown) to restart the conveying of the sheet. The sheet is discharged to a discharge tray 29 by a discharge roller 28 shown in FIG. When the sheets are to be stapled after the perforation, as described above, the sheets are aligned on the intermediate tray 27 by the knurl belt 26, stapled by the stapler 22 and then conveyed in a bundle to the discharge tray 29. Discharge and load.

(Punch Debris Detecting Apparatus) The punch dust detecting apparatus 69 will be described with reference to FIG. The transmission sensor (stacking height detecting means) 66 is provided on the front side plate 31 and emits transmitted light, and the light emitting unit 66a is provided on the rear side plate 32 and emits light.
And a light-receiving section 66b for receiving the transmitted light from the light-receiving section 6a. The transmission sensor 66 emits transmitted light along the arrangement direction of the plurality of punches 42 (43) attached to the drive shaft 68 (38) (along the drive shaft 68 (38)). . In the dust box 58 for receiving punch dust generated when a hole is formed in the sheet, through holes (pass allowance portions) 58a, 58a are formed on both side surfaces so that light transmitted by the transmission sensor 66 can pass therethrough. The passage hole 58a is formed to prevent the transmitted light from being blocked by the dust box 58. Therefore, it is sufficient that the transmitted light is not blocked by the dust box 58.
Instead of a, a U-shaped, V-shaped, or other shaped notch may be used.

Note that the dust box 58 does not necessarily need to be provided. The punch scraps may be directly loaded in the housing 59, and the punch scraps may be swept out by the user when the punch scraps reach a predetermined height.

The punch dust 67 forms a number of peaks corresponding to the number of punches. The plurality of peaks are formed to be linearly arranged corresponding to the punches arranged linearly. That is, when two holes are punched in the sheet according to the specifications of the punching device 2, the number of peaks of the punch dust 67a becomes two as shown by the broken line in FIG. Then, the number of peaks of the punch waste 67b becomes three as shown by the solid line.

The transmitted light from the light emitting section 66a of the transmission sensor 66 is received by the light receiving section 66b without being blocked by the punch chips 67 until the stacking height of the punch chips 67 reaches a certain height. When a predetermined amount of the punch dust 67 is stacked and reaches a certain height, the transmitted light from the light emitting unit 66a is blocked by the punch dust 67 and is not received by the light receiving unit 66b. As a result, the transmission sensor 66 detects that the punch waste has reached the predetermined stacking height. Transmission sensor 66
Indicates the punch 42 (43) and the die holes 50a (50b)
Since the transmitted light is transmitted from the direction of the arrangement and the punch dust is detected, the transmission direction of the transmitted light and the arrangement direction of the pile of the punch waste match, and the peak of the pile of the punch waste 67 is detected.

Thus, the transmission sensor 66 changes the number of punches in order to detect the peak of
Even if the number of peaks formed by the punch dust changes, the transmission sensor 66 always detects the peak of the peak of the punch dust, and is not affected by the number of punches punching holes in the sheet. By detecting that the stacking height of the waste has reached a predetermined height, the punch waste does not overflow from the dust box 58.

That is, as shown in FIG. 3, the transmission sensor 66 is also capable of forming the punch waste 67a generated when the sheet is punched by the two-hole punch section 42. 6 generated when punching a hole in a sheet
Also in the case of 7b, the peak of the mountain having the same height is detected.

The dust box 58 includes a transmission sensor 66.
Is formed in order to prevent the dust box 58 from blocking the transmitted light. The punch dust that has reached a predetermined stacking height in the dust box 58 and has been fully loaded is taken out of the housing 59 of the punching device 2 and discarded. When the dust box 58 is returned to the original position, if the dust box 58 is not returned to the predetermined position,
8a cannot face the transmission sensor 66. Therefore, the transmitted light is blocked by the dust box 58, and the transmission sensor 66 detects that the dust box 58 has not been returned to the predetermined position. As described above, by forming the transmitted light passage hole 58 a in the dust box 58, the transmission sensor 66 can detect not only the height of the punch dust 67 but also the attachment / detachment of the dust box 58.

However, in this case, if the user removes the dust box 58 from the housing 59 of the punching device 2 and starts the punching device 2 without forgetting to return it, the transmitted light is not blocked and the transmission sensor 66 , Dust box 58
Is erroneously detected as being returned to the predetermined position.

Therefore, as shown in FIGS. 3 and 6, the full load detecting shutter (blocking member) 65 is tiltable to the front side plate 1 by the support shaft 64 so as to block the transmitted light from the light emitting portion 66a of the transmission sensor 66. It is provided. When the dust box 58 is taken out of the housing 59, the full load detection shutter 64 tilts from the position indicated by the broken line to the position recommended by the user by its own weight, as shown in FIG. It is possible to detect that the user has forgotten to mount the dust box 58 or that the dust box 58 is not mounted at a predetermined position.

However, when the dust box 58 is mounted at a predetermined position, the full load detecting shutter 65
Must be allowed to pass through. Therefore, when the dust box 58 is attached to a predetermined position of the housing 59 of the punching device 2, the full load detection shutter 65 is
Is tilted, and a full load detection shutter hole 65a that allows the transmitted light from the light emitting unit 66a to pass therethrough is formed at a position facing the light emitting unit 66a.

Accordingly, when the dust box 58 is mounted at a predetermined position, the full-load detection shutter 65 is pushed by the dust box 58 and tilts, and the full-load detection shutter hole 65a allows the transmitted light of the transmission sensor 66 to pass therethrough. Then, the transmission sensor 66 can detect punch dust. Further, the full load detection shutter 65 is connected to the dust box 5.
When 8 is pulled out of the housing 59, the transmitted light of the transmission sensor 66 is blocked, so that the transmission sensor 66 can detect that the dust box 58 has been taken out of the housing 59.

The full load detection shutter 65 described above is designed to rotate by its own weight, but may be biased by a spring in a counterclockwise direction.

Although the full load detection shutter 65 is tilted, it may be slid like a full load detection shutter (blocking member) 70 shown in FIG. The full load detection shutter 70 includes a tension spring 71,
When the dust box 58 is attached to the housing 59, the protrusion 58 is slid against the tension spring 71 by the protruding shaft 58b, and the full load detection shutter hole 70a formed in the full load detection shutter 70 is drawn. so,
The transmission sensor 66 allows the transmitted light to pass therethrough. When the dust box 58 is pulled out of the housing 59, the full load detection shutter 70 is pulled by the tension spring 71, closes the passage hole 58a of the dust box 58, and cuts off the transmitted light of the transmission sensor 66. .

Therefore, the full load detection shutter 70
Also, when the dust box 58 is mounted at a predetermined position, the dust box 58 is moved by being pushed by the dust box 58, and the transmitted light of the transmission sensor 66 is allowed to pass through the full load detection shutter hole 70a. So that it can be detected. When the dust box 58 is pulled out of the housing 59, the full load detection shutter 70 blocks the transmitted light of the transmission sensor 66 so that the transmission sensor 66 can detect that the dust box 58 has been taken out of the housing 59. ing.

As described above, the full load detection shutters 65 and 70
Is provided, the transmission sensor 66 can
7, it is possible to detect the attachment / detachment of the dust box 58 as well as the height of the dust box 58.

When the transmission sensor 66 detects that the stacking height of the punch dust has reached a certain height, or detects that the dust box is not set at a predetermined position, for example, , Control device 72 of drilling device 2
(See FIG. 3), the fact that the punching device 2 is in an abnormal state is displayed on the display panel 73 of the copying machine body 1, the punching device 2 is stopped, or the copying machine body 1 is notified and the By stopping the image formation, scattering of the punch dust can be prevented beforehand.

It should be noted that the punch dust detecting device of the above embodiment can be applied to not only two holes and three holes but also other numbers of holes.

Further, in the punching apparatus of the above embodiment, the number of punches is determined according to the specification, and holes are formed in the sheet only by the determined number of punches. In some perforators, different numbers of holes can be selectively drilled in the sheet with one unit. The punch dust detection device of the present invention can be applied to such a punching device.

[0061]

According to the punch dust detecting device of the present invention, the stack height detecting means detects the punch dust by the transmitted light along the arrangement direction of the punches and the die holes. Even if the holes are different, since the peak of the punch dust is always detected, it is possible to reliably detect that the punch dust is full with a simple configuration.

Further, when a permissible light transmitting portion is formed in the dust box of the punching device, the punch dust detecting device detects not only the full load of the punch dust but also discards the punch dust by the loading height detecting means. By detecting whether or not the dust box is mounted at a predetermined position, it is possible to prevent scattering of punch dust.

Further, when the punching device is provided with a blocking member capable of blocking transmitted light, the punch dust detecting device not only detects the full load of the punch dust but also discards the punch dust by the loading height detecting means. Thereafter, it is detected whether or not the dust box is mounted at a predetermined position, so that scattering of punch dust can be prevented.

Since the image forming apparatus of the present invention is provided with the punch dust detecting device capable of preventing the scattering of the punch dust, it does not malfunction due to the punch dust,
The sheet on which the image is formed can be reliably supplied.

[Brief description of the drawings]

FIG. 1 is a schematic front sectional view of a copy which is an image forming apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic front sectional view of a punching device provided with the punch dust detection device of the present invention.

FIG. 3 is a sectional view taken along the line AA in FIG.

FIG. 4 is a perspective view of a punch for two holes and a die.

FIG. 5 is an explanatory diagram of a drilling operation. (A) is a state diagram before drilling. (B) is a state diagram immediately before drilling. (C) State diagram during drilling. (D) is a state diagram after completion of drilling.

FIG. 6 is a diagram illustrating the operation of a full load detection shutter.
(A) It is a figure of the state where the dust box was attached to the perforation device. (B) It is the figure of the state which took out the dust box from the perforation apparatus.

FIG. 7 is a diagram illustrating an operation of a full load detection shutter according to another embodiment. (A) It is a figure of the state where the dust box was attached to the perforation device. (B) It is the figure of the state which took out the dust box from the perforation apparatus.

FIG. 8 is a schematic front sectional view of a punching device provided with a conventional punch waste detection device.

FIG. 9 is a sectional view taken along the line BB in FIG.

[Explanation of symbols]

 P sheet (member to be punched) 1 Copying machine main body 2 Punching device 3 Post-processing device 4 Image reading unit 5 Feeding unit 6 Image forming unit (image forming unit) 22 Stapler 23 Folding unit 31 Front side plate 32 Rear side plate 38 Three holes Drive shaft 42 Punch portion for two holes 43 Punch portion for three holes 47 Punch 49 Frame body 50 Die 50a Die hole for two holes 50b Die hole for three holes 51 Sheet transport path 58 Dust box 58a Dust box passage hole ( 58b Projection shaft 59 Case 65 Full load detection shutter (blocking member) 65a Full load detection shutter hole 66 Transmission sensor (load height detection means) 66a Transmission sensor light emitting unit 66b Transmission sensor light receiving unit 67 Punch waste 67a Punch waste ( 2 holes) 67b Punch waste (3 holes) 68 2-hole drive shaft 69 Punch waste detection device 70 Full load detection Data (blocking member) 70a full detecting shutter hole 71 a tension spring 72 the control device 73 the display panel 99 the post-processing unit 100 copier (image forming apparatus)

Claims (5)

[Claims] 1. A stacking height of punch chips generated during a punching operation of a punching device for punching a plurality of holes in a member to be punched by a plurality of punches arranged in a straight line and a die hole of a die facing the punch. A punch waste detecting device for a punching device, comprising: a stack height detecting means for detecting the punch waste by transmitted light along a direction in which the punches and the die holes are arranged. Detection device. 2. The punching device has a dust box for accommodating the punch dust detachably in a direction intersecting a transmission direction of the transmitted light, and when the dust box is mounted at a mounting position, the dust box has a dust box. A pass permitting part that allows passage is formed in the dust box, and the loading height detecting unit detects whether the transmitted light is passing through the pass permitting part, so that attachment / detachment of the dust box can also be detected. 2. The punch dust detecting device for a punching device according to claim 1, wherein: 3. The punching device has a dust box for accommodating the punch dust detachably in a direction intersecting with the transmission direction of the transmitted light, and a blocking member that blocks the transmitted light when the dust box is taken out. The loading height detecting means detects whether or not the transmitted light passes without being blocked by the blocking member, so that the attachment / detachment of the dust box can be detected. The punch dust detection device for a punching device according to claim 1, wherein 4. The punching device has a dust box for accommodating the punch dust detachably in a direction intersecting with a transmission direction of the transmitted light, and a blocking member for blocking the transmitted light when the dust box is taken out. The dust box is displaceably formed, and the dust box is formed with a passage permitting portion that allows the transmission of the transmitted light when the dust box is mounted at the mounting position, and the transmitted light is transmitted without being blocked by the blocking member. The punch waste for a punching device according to claim 1 or 3, wherein the loading height detecting means detects whether or not the dust box has passed through, thereby enabling detection of attachment / detachment of the dust box. Detection device. 5. An image forming means for forming an image on a to-be-pierced member, a perforating device for perforating the to-be-perforated member on which the image is formed, and detecting a loading height of punch chips generated from the perforating device. An image forming apparatus comprising: the punch dust detection device for a punching device according to any one of claims 1 to 4, wherein the member to be punched is a sheet.