JP5116148B2 - Multi-optical axis photoelectric switch, controller and printing system - Google Patents

Description

  The present invention relates to a multi-optical axis photoelectric switch, a controller thereof, and a printing system using the multi-optical axis photoelectric switch.

  2. Description of the Related Art Conventionally, for example, in a sheet-fed printing machine, in order to prevent an object other than printing paper from entering a paper discharge unit from which printed paper (hereinafter referred to as printing paper) is discharged, A switch (light curtain) is provided. This multi-optical axis photoelectric switch is provided outside the area where the printing paper of the paper discharge unit is stacked, and a light projecting unit in which a plurality of light projecting elements are arranged in a row, and the same number of light receiving elements as the light projecting elements Are arranged in a row, and these light projecting and receiving units form a protection area. The multi-optical axis photoelectric switch detects that there is an abnormality when a light-shielding object enters the protection area, and outputs a detection signal to, for example, a printing press or a warning device. By receiving this signal in each device, the drive of the printing press is stopped, a warning by the sound of the warning device, or the like is performed.

  By the way, in the above-described printing machines and the like, printing paper is stacked on a tray provided in a paper discharge unit. Since this tray needs to be replaced by an operator every 5000 sheets, for example, the protection barrier of the multi-optical axis photoelectric switch is detected so that even if a light shielding object enters the protection barrier during replacement, it is not recognized as light shielding. Muting must be done to temporarily disable it. Also, at the start of printing, it is necessary to perform muting in order to confirm the test printing. In particular, in a printing press, it is preferable to operate continuously as much as possible, and the above-described muting needs to be performed only in the work area (tray replacement location or test printing confirmation location).

Therefore, there is one disclosed in Patent Document 1 as a multi-optical axis photoelectric switch capable of performing the above-described muting.
In the multi-optical axis photoelectric switch of Patent Document 1, when it is desired to partially perform muting, the user first determines which light projecting element and light receiving element of the multi-optical axis photoelectric switch are to be muted (invalidated). In the printing machine, for example, when the tray is installed at the lowermost part of the paper discharge unit, information indicating that the lowermost light projecting element and light receiving element are muted is stored in the memory. In addition, information for muting the light emitting element and the light receiving element at the top of the paper discharge unit is stored in the memory to check the trial printing, and is discharged to take out the tray when the tray is full. Information that mutes all the light projecting elements and light receiving elements (multi-optical axis photoelectric switches) provided in the paper portion is stored in the memory. Such information can select the above-mentioned three types of muting by switching the memory, for example, by switching a switch provided in a controller that controls the multi-optical axis photoelectric switch.
JP 2003-218679 A

  By the way, the multi-optical axis photoelectric switch of Patent Document 1 is designed so that muting is performed only when a light-shielding object is detected by a separately provided detection sensor (muting sensor) and switching of the switch is selected. . That is, muting is performed by a controller that has received two types of signals, that is, a detection signal when a light shielding object is detected by the detection sensor and a signal generated when the user selects a switch.

  However, the controller has to process two kinds of signals, and the control load of the entire system of the multi-optical axis photoelectric switch increases, and a multi-optical axis photoelectric switch having a lower load system configuration has been desired.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to form a protection area in a printing press, simplify processing for setting muting for the protection area, and control load. It is an object of the present invention to provide a multi-optical axis photoelectric switch and a printing system using the same.

  In order to solve the above problems, the invention described in claim 1 is a first step of setting a printed material receiving tray on which printed materials are stacked in a printed material discharge chamber, and confirming a printing state on the printed material. For a printing machine having an operation cycle composed of a second step for removing the printed matter receiving tray and a third step for taking out the printed matter on the printed matter receiving tray. A plurality of photoelectric sensors installed in the vertical direction on both sides of the entrance and exit of the printed product discharge chamber, and a control for forming a protection area for detecting an intrusion abnormality at the entrance and exit of the printed product discharge chamber by sequentially operating the plurality of photoelectric sensors. A multi-optical axis photoelectric switch comprising: a control means for performing an operation based on an operation signal from a first operation switch operated in the operation of the first step. Muting the photoelectric sensor located at the bottom of the printed material discharge chamber and positioning it at the top of the printed material discharge chamber based on an operation signal from a second operation switch operated in the operation of the second step The gist of the invention is that the photoelectric sensor is muted, and all the photoelectric sensors are muted based on a print end signal from the printing machine in the operation of the third step.

  In the present invention, the control means mutes the photoelectric sensor located at the bottom of the printed material discharge chamber based on the operation signal from the first operation switch operated in the operation of the first step. Further, the control means mutes the photoelectric sensor located at the uppermost part of the printed material discharge chamber based on an operation signal from the second operation switch operated in the operation of the second step. Further, the control means mutes all of the photoelectric sensors based on the print end signal from the printing press in the operation of the third step. As a result, the control means can perform muting with a single control signal, so that the processing for setting muting can be simplified and the control load applied to the control means can be reduced.

  According to a second aspect of the present invention, in the multi-optical axis photoelectric switch according to the first aspect, the control means is configured to operate the first operation switch or the second operation switch based on an operation of a release switch for canceling muting. The gist is to cancel muting based on the operation.

  In the present invention, the control means releases the muting based on the operation of the first operation switch or the second operation switch based on the operation of the release switch for canceling the muting. Thus, even if muting is performed by operating the first operation switch or the second operation switch, the muting can be released by the release switch.

  The gist of the invention described in claim 3 is the multi-optical axis photoelectric switch according to claim 1 or 2, wherein the photoelectric sensor includes a projector and a light receiver that receives light from the projector. .

  In the present invention, the photoelectric sensor is composed of a projector and a light receiver that receives light from the projector, so that, for example, any one of the projector and the light receiver can be easily replaced even if a trouble such as a failure occurs. , Maintenance can be improved.

  According to a fourth aspect of the present invention, in the multi-optical axis photoelectric switch according to any one of the first to third aspects, the control means uses an informing means when the intrusion abnormality is detected by the photoelectric sensor. The gist is to make the notification.

  In the present invention, the control means can notify the operator that light other than the muting location has been shielded by causing the notification means to notify when an intrusion abnormality is detected by the single photoelectric sensor. The operator can know it.

  According to a fifth aspect of the present invention, in the multi-optical axis photoelectric switch according to any one of the first to fourth aspects, the control means detects the number of series connection of the plurality of photoelectric sensors, and the connection position thereof. The gist is to set one end of the sensor as the photoelectric sensor to be muted in the first step and set the other end of the connection position as the photoelectric sensor to be muted in the second step.

  In this invention, the control means detects the number of series connection of a plurality of photoelectric sensors, sets one end of the connection position as a photoelectric sensor to be muted in the first step, and sets the other end of the connection position in the second step. Set as a photoelectric sensor for muting. Thereby, for example, even when the number of photoelectric sensors is changed, the photoelectric sensor to be muted in the first process and the photoelectric sensor to be muted in the second process are automatically set by the control means. For this reason, it is possible to reduce the setting effort by the operator, and to prevent setting errors.

  The invention according to claim 6 is a first step of setting a printed matter receiving tray in which printed printed matter is laminated in a printed matter discharge chamber, a second step for confirming a printing state on the printed matter, and The printed matter receiving tray is pulled out and installed in a printing machine having an operation cycle composed of a third step of taking out the printed matter on the printed matter receiving tray, on both sides of the entrance of the printed matter discharge chamber of the printing machine. A controller that performs control to form a protection area for detecting an intrusion abnormality at the entrance / exit of the printed material discharge chamber by sequentially performing a light projecting / receiving operation on a plurality of photoelectric sensors installed in the vertical direction. Based on the operation signal from the first operation switch operated in the operation of the first step, the photoelectric sensor located at the bottom of the printed material discharge chamber is muted. Based on an operation signal from a second operation switch operated in the operation of the second step, the photoelectric sensor located at the uppermost part of the printed material discharge chamber is muted, and the printing is performed in the operation of the third step. The gist of the invention is to mute all the photoelectric sensors based on the print end signal from the machine.

In the present invention, a controller having the same effect as the effect of the first aspect of the invention can be provided.
According to a seventh aspect of the present invention, in the controller according to the sixth aspect, the connection order of the photoelectric sensors is detected, and the photoelectric sensor to be muted in each step is recognized based on the connection order. The controller which produces the effect similar to the effect of the invention of Claim 5 can be provided.

  The invention according to claim 8 is a first step of setting a printed matter receiving tray on which printed printed matter is stacked on a printed matter discharge unit, a second step for confirming a printing state on the printed matter, and A multi-optical axis photoelectric switch according to any one of claims 1 to 5, and a printing machine having an operation cycle comprising a third step of pulling out the printed matter receiving tray and taking out the printed matter on the printed matter receiving tray. The gist is that

  In this invention, the printing system which can show | play the effect similar to the effect of the invention of Claims 1-5 can be provided.

  Therefore, according to the above-described invention, a protection area is formed in the printing press, a multi-optical axis photoelectric switch capable of simplifying the processing for setting muting for the protection area and reducing the control load, and A printing system using the same can be provided.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
As shown in FIG. 1, the printing press 1 of the present embodiment is provided with a transport device 3 that operates based on the control of the print control device 2. The conveying device 3 is provided with a conveying belt 4, and the conveying belt 4 is provided with a plurality of grips 5 at equal intervals, and is printed on the conveying paper 4 up to the conveying terminal end 4 a of the conveying belt 4. 6 are conveyed one after another. A discharge unit 7 serving as a printed sheet discharge unit on which the print sheets 6 are stacked is provided below the conveyance termination unit 4a. The discharge unit 7 is loaded with the print sheets 6 and discharged. A paper discharge tray 8 that automatically descends from the upper part of 7 is detachably provided. FIG. 1 shows a full state in which the print paper 6 fills the discharge area 7 a in the discharge tray 8. When there is no print paper 6, the discharge tray 8 is located above the discharge section 7. It is located on the (conveyance terminal end 4a side).

  The paper discharge unit 7 is provided with a multi-optical axis photoelectric switch 10 including a single optical axis photoelectric sensor (light projector and light receiver) at a position that does not overlap the paper discharge area (protection area) 7a. This multi-optical axis photoelectric switch 10 includes three light projectors 11 to 13, three light receivers 14 to 16, and light axes L1 to L1 formed between the light projectors 11 to 13 and the light receivers 14 to 16 facing each other. It is comprised from the controller 17 as a control means which determines whether L3 exists in a light-shielding state. The light projectors 11 to 13 are provided on the left frame 7 b of the paper discharge unit 7, and the light receivers 14 to 16 are provided on the right frame 7 c of the paper discharge unit 7. The light projector 11 and the light receiver 14, the light projector 12 and the light receiver 15, and the light projector 13 and the light receiver 16 are arranged to face each other with their optical axes L 1 to L 3 aligned. The height of the optical axis L1 between the light projector 11 and the light receiver 14 is provided to be slightly higher than the uppermost printing paper 6 stacked on the paper discharge tray 8. The height of the optical axis L3 between the light projector 13 and the light receiver 16 is set to be substantially the same as the height when the paper discharge tray 8 is positioned at the lowest position. The height of the optical axis L2 between the projector 12 and the light receiver 15 is the height direction of the height of the optical axis L1 of the projector 11 and the light receiver 14 and the height of the optical axis L3 of the projector 13 and the light receiver 16. It is provided to be at an intermediate position.

  The light projectors 11 to 13 and the light receivers 14 to 16 are connected to the controller 17. The controller 17 sequentially outputs a projection signal to each of the projectors 11 to 13, and each of the projectors 11 to 13 sequentially drives to emit light based on the projection signal. Each of the light receivers 14 to 16 detects (receives) light emitted from each of the projectors 11 to 13 and outputs a light reception signal to the controller 17. And the controller 17 determines whether each optical axis L1-L3 formed between each light projector 11-13 and each light receiver 14-16 which oppose based on this input light reception signal is in the light-shielding state. To do.

  Each of the projectors 11 to 13 and each of the light receivers 14 to 16 is automatically assigned an address in order from the shortest connection path from the controller 17 by the controller 17, and the controller 17 counts the number of addresses. The number of connections (number of connection pairs) of the projectors 11 to 13 and the light receivers 14 to 16 connected to the controller 17 is determined.

  More specifically, as shown in FIG. 2, a first sensor address (Mal 1 in FIG. 2) is assigned to the projector 13 and the light receiver 16 by the controller 17. A second sensor address (circle 2 in FIG. 2) is assigned to the projector 12 and the light receiver 15 by the controller 17. A third sensor address (maru 3 in FIG. 2) is assigned to the projector 11 and the light receiver 14 by the controller 17. The number of connections is determined by counting the number of sensor addresses by the controller 17. It is recognized that the projector 13 and the light receiver 16 to which the address is assigned first, that is, the first sensor address is assigned at the bottom. Finally, it is recognized that the projector 11 and the light receiver 14 to which the address is assigned, that is, the third sensor address is assigned, are installed at the top. It is recognized that the projector 12 to which the second sensor address is assigned is installed in the intermediate part between the projector 11 and the projector 13, and the light receiver 15 to which the second sensor address is assigned is the intermediate between the receiver 14 and the receiver 16. It is recognized that it was installed in the department.

The controller 17 is connected to the print control apparatus 2 and can control each other.
In addition, the controller 17 includes a first operation switch 18 a for muting the projector 13 and the light receiver 16, a second operation switch 18 b for muting the projector 11 and the light receiver 14, and the above-described muting. A release switch 18c for releasing the pinning is connected.

  These switches 18a to 18c are used by the operator to perform muting in accordance with the work process. The first operation switch 18a is used in the first step of installing the paper discharge tray 8. The second operation switch 18b is used in the second step of confirming the printing state of the printing paper 6, that is, confirming the test printing. The release switch 18c is a switch used by an operator at the end of the first and second steps, and is used to release muting.

Next, the printing system of the printing press 1 of this Embodiment is demonstrated using FIGS. 1-3.
The printing system of the present embodiment is configured to detect intrusions other than the printing paper 6 into the paper discharge area 7 a of the paper discharge unit 7 by the optical axes L 1 to L 3 of the multi-optical axis photoelectric switch 10.

  First, since the operator installs the paper discharge tray 8 below the paper discharge unit 7, the operator pushes the first operation switch 18a and the operation signal (first mux) output from the first operation switch 18a. The controller 17 performs muting of the light projector 13 and the light receiver 16 of the multi-optical axis photoelectric switch 10. When the installation of the discharge tray 8 is completed, the release switch 18c is pushed by the operator, and the controller 17 receives the muting release signal output from the release switch 18c, whereby the controller 17 projects the projector 13 of the multi-optical axis photoelectric switch 10. And the muting of the light receiver 16 is canceled. The installed paper discharge tray 8 is automatically moved to the top of the paper discharge unit 7. Thereafter, the printing machine 1 performs printing as usual.

  When printing is started as usual, the operator presses the second operation switch 18b and outputs from the second operation switch 18b in order to confirm the printing status of the printing paper 6, that is, to confirm the test printing. By receiving the operation signal (second muting signal), the controller 17 mutes the light projector 11 and the light receiver 14 of the multi-optical axis photoelectric switch 10. When the confirmation of the trial printing is completed, the release switch 18c is pushed by the operator, and the controller 17 receives the muting release signal output from the release switch 18c, whereby the controller 17 projects the light projector 11 and the light receiver 14 of the multi-optical axis photoelectric switch 10. Cancel muting.

  When the print control device 2 provided in the printing press 1 determines that the paper discharge tray 8 is full, a print end signal is output from the print control device 2 to the controller 17. The controller 17 receives the signal and performs muting of each of the light projectors 11 to 13 and each of the light receivers 14 to 16. As a result, it becomes possible to take out the paper discharge tray 8 full of the printing paper 6 (third step).

  2 and 3, A, B, and C indicate the first step, the second step, and the third step, respectively, that is, A is muting by the operation of the first operation switch 18a, and B is the second operation. Muting by operation of the switch 18b, C indicates muting of each of the projectors 11-13 and each of the light receivers 14-16.

  When the light projectors 11 to 13 and the light receivers 14 to 16 are shielded from light other than the muting operation described above, the controller 17 sends a signal indicating that an intrusion abnormality has occurred to the print control device 2 of the printing press 1. The printing control device 2 that has received the signal and has received the signal stops the driving of the printing press 1 and the driving of the conveying belt 4 to stop the printing operation.

Next, characteristic actions and effects of the present embodiment will be described.
(1) The controller 17 is a single unit composed of a projector 13 and a light receiver 16 positioned at the bottom of the paper discharge unit 7 based on a first muting signal from the first operation switch 18a operated in the operation of the first step. Muting the optical axis photoelectric sensor. Further, the controller 17 is a single light composed of the light projector 11 and the light receiver 14 positioned at the uppermost part of the paper discharge unit 7 based on the second muting signal from the second operation switch 18b operated in the operation of the second step. Muting the axial photoelectric sensor. Furthermore, the controller 17 mutes all of the light projectors 11 to 13 and the light receivers 14 to 16 based on the print end signal from the printing press in the operation of the third step. As a result, the control means can perform muting with a single control signal, so that the processing for setting muting can be simplified and the control load applied to the control means can be reduced.

  (2) Since the multi-optical axis photoelectric switch 10 is composed of the single optical axis photoelectric sensors (senders 11 to 13 and light receivers 14 to 16), the single optical axis photoelectric sensor is exchanged even if a trouble such as a failure occurs. Therefore, maintenance can be improved.

  (3) The controller 17 releases the muting based on the operation of the first operation switch 18a or the second operation switch 18b based on the operation of the release switch 18c for canceling the muting. Even if the first operation switch 18a or the second operation switch 18b is inadvertently operated and muting is performed, the muting can be canceled by the release switch 18c.

  (4) The single optical axis photoelectric sensor is configured by the light projectors 11 to 13 and the light receivers 14 to 16 that receive light from the light projector, so that, for example, one of the light projectors 11 to 13 and the light receivers 14 to 16 is broken. Since the replacement is easy even if this trouble occurs, the maintainability can be further improved.

  (5) The controller 17 detects the number of series connection of a plurality of single optical axis photoelectric sensors (light projectors 11 to 13 and light receivers 14 to 16), and the light projector 13 at the bottom of the paper discharge unit 7 which is one end of the connection position. And the light receiver 16 are set as sensors for muting in the first step, and the projector 11 and the light receiver 14 at the top of the paper discharge unit 7 which is the other end of the connection position are set as sensors for muting in the second step. I did it. Even when the number of sensors of the single optical axis photoelectric sensors (projectors 11 to 13 and light receivers 14 to 16) is changed, the single optical axis photoelectric sensor muted in the first step by the controller 17 and muted in the second step A single optical axis photoelectric sensor is automatically selected. For this reason, muting setting work can be simplified for a sensor that has been complicated in the prior art, setting work by an operator can be reduced, and setting errors can be prevented.

The embodiment of the present invention may be modified as follows.
In the above embodiment, the multi-optical axis photoelectric switch 10 is configured using single optical axis photoelectric sensors each including three projectors 11 to 13 and light receivers 14 to 16, but the number of projectors and light receivers is the same. Not exclusively. For example, as shown in FIG. 4, the projectors 11, 12a, 12b, 13 and the light receivers 14, 15a, 15b. 16 may be used to form the multi-optical axis photoelectric switch 10. In addition, the multi-optical axis photoelectric switch 10 is configured by using a single optical axis photoelectric sensor composed of a pair of projectors 11 to 13 and light receivers 14 to 16. However, the present invention is not limited to this. The multi-optical axis photoelectric switch 10 may be configured by using a plurality of optical axis photoelectric sensors.

  In the embodiment described above, when the intrusion abnormality occurs, the drive of the printing press 1 and the drive of the conveyor belt 4 are stopped. However, the present invention is not limited to this, and the controller 17 is notified as shown by a broken line in FIG. A notification device 20 as a means may be connected to notify by sound or light emission when an intrusion abnormality occurs. As a result, it is possible to notify the operator that an intrusion abnormality has occurred.

In the above embodiment, the switches 18a to 18c are provided on the printing press 1 side, but may be provided on the multi-optical axis photoelectric switch 10 side.
In the above embodiment, the separation type single optical axis photoelectric sensor such as the projectors 11 to 13 and the light receivers 14 to 16 is provided. For example, a mirror is provided at a position opposed to the projector, and light is applied from the projector to the mirror. Further, it may be a single optical axis photoelectric sensor composed of a light receiver in which the reflected light is integrally formed with a projector, that is, a so-called integrated single optical axis photoelectric sensor.

  In the above embodiment, the printing machine 1 handles the printing paper 6, but a printed material other than paper may be used.

It is a schematic block diagram of the printing machine in this Embodiment and the single optical axis photoelectric switch used for it. It is explanatory drawing for demonstrating the muting setting in the same as the above. It is explanatory drawing for demonstrating the muting setting in the same as the above. It is explanatory drawing for demonstrating the muting setting in another example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Printing machine, 6 ... Printing paper (printed material), 7 ... Paper discharge part (printed material discharge chamber), 7a ... Paper discharge area (protection area), 8 ... Paper discharge tray (printed material receiving tray), 10 ... Multi-light Shaft photoelectric switch, 11, 12, 13 ... projector, 14, 15, 16 ... light receiver, 18a ... first operation switch, 18b ... second operation switch, 18c ... release switch, 20 ... notification device (notification means).

Claims (8)

A first step of setting a printed product receiving tray on which printed products are stacked in a printed product discharge chamber; a second step for confirming a printing state on the printed product; and pulling out the printed product receiving tray to receive the printed product. Installed in a printing press having an operation cycle composed of a third step of taking out the printed matter on the tray;
A plurality of photoelectric sensors installed in the vertical direction on both sides of the entrance and exit of the printed product discharge chamber of the printing press, and a protective area for detecting an intrusion abnormality at the entrance and exit of the printed product discharge chamber by sequentially projecting and receiving the plurality of photoelectric sensors. A multi-optical axis photoelectric switch comprising control means for performing control to form
The control means mutes the photoelectric sensor located at the lowermost part of the printed material discharge chamber based on an operation signal from a first operation switch operated in the operation of the first step. Based on the operation signal from the second operation switch operated by the operation, the photoelectric sensor located at the uppermost part of the printed material discharge chamber is muted, and the print end signal from the printing machine is operated by the operation of the third step. A multi-optical axis photoelectric switch characterized by muting all of the photoelectric sensors based on the above. The multi-optical axis photoelectric switch according to claim 1.
The multi-optical axis photoelectric switch, wherein the control means releases muting based on an operation of the first operation switch or the second operation switch based on an operation of a release switch for canceling muting. The multi-optical axis photoelectric switch according to claim 1 or 2,
The photoelectric sensor comprises a light projector and a light receiver that receives light from the light projector. In the multi-optical axis photoelectric switch according to any one of claims 1 to 3,
The multi-optical axis photoelectric switch according to claim 1, wherein when the intrusion abnormality is detected by the photoelectric sensor, the control unit causes the notification unit to perform notification. In the multi-optical axis photoelectric switch according to any one of claims 1 to 4,
The control means detects the number of series connection of the plurality of photoelectric sensors, sets one end of the connection position as the photoelectric sensor to be muted in the first step, and sets the other end of the connection position to the second step. A multi-optical axis photoelectric switch, wherein the photoelectric sensor is set as the photoelectric sensor to be muted by the optical sensor. A first step of setting a printed product receiving tray on which printed products are stacked in a printed product discharge chamber; a second step for confirming a printing state on the printed product; and pulling out the printed product receiving tray to receive the printed product. Installed in a printing press having an operation cycle composed of a third step of taking out the printed matter on the tray;
A plurality of photoelectric sensors are sequentially projected and received with respect to photoelectric sensors installed on both sides of the entrance of the printed product discharge chamber of the printing machine to detect an abnormal entry at the entrance of the printed product discharge chamber. A controller that performs control to form a protection area,
Based on the operation signal from the first operation switch operated in the operation of the first step, the photoelectric sensor located at the lowermost part of the printed material discharge chamber is muted and operated in the operation of the second step. Based on an operation signal from a second operation switch, the photoelectric sensor located at the top of the printed material discharge chamber is muted, and the photoelectric sensor is based on a print end signal from the printing machine in the operation of the third step. A controller characterized by muting everything. The controller of claim 6, wherein
The number of series connection of the plurality of photoelectric sensors is detected, one end of the connection position is set as the photoelectric sensor to be muted in the first step, and the other end of the connection position is muted in the second step A controller that is set as a photoelectric sensor. A first step of setting a printed product receiving tray on which printed products are stacked in a printed product discharge chamber; a second step for confirming a printing state on the printed product; and pulling out the printed product receiving tray to receive the printed product. A printing press having an operation cycle composed of a third step of taking out the printed matter on the tray;
A printing system comprising: the multi-optical axis photoelectric switch according to claim 1.

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