Photoelectric fork sensors
With photoelectric fork sensors, the transmitter and receiver are located in the two ends of the housing and detect objects within the fork range. Thanks to the torsion-resistant housing, the device is always faultlessly aligned and functions perfectly, even with temperature fluctuations and mechanical stress. Particularly suitable for small thin objects. Read more here
Photoelectric fork sensors
All items of the category Photoelectric fork sensors:
Fork-Type Photoelectric Sensors: Precise Detection of Small Parts
Our fork-type photoelectric sensors provide reliable and precise detection of even the smallest objects in production and conveyor systems. Since the transmitter and receiver are permanently mounted in a U-shaped housing, they completely eliminate the need for adjustment. Thanks to their compact design, rugged housing, and switchable light/dark detection modes, you can quickly and reliably integrate our sensors into your control systems.
Design and Operation of Fork-Type Photoelectric Sensors
Fork-type photoelectric sensors are optical sensors consisting of two main components: a transmitter and a receiver, arranged in a fork-like configuration. The transmitter emits a beam of light—often red light—which is detected by the receiver. When an object interrupts the beam, a signal is triggered that is considered valid for controlling various applications, such as in automation technology.
These photoelectric sensors operate by precisely detecting interruptions in the light beam. Many modern fork-type photoelectric sensors use laser technology for greater accuracy and range. The programmable light/dark switching function determines whether the sensor outputs a signal when the light beam is unobstructed or when it is interrupted. This offers maximum flexibility for integration into your PLC logic.
Advantages of fork-type photoelectric sensors compared to traditional photoelectric sensors
- Compact design: Ideal for installations in tight spaces—takes up little room and allows for flexible integration.
- Easy installation: Quick and easy to install, without the need for time-consuming adjustments or extensive installation work.
- Reliable signal transmission: PNP technology ensures secure and stable communication with the controller.
- Precise Position Detection: Detection by directly interrupting the light beam between the fork arms; high accuracy even with small objects.
- Minimized false alarms: A clear distinction between actual objects and ambient light reduces false triggers and increases process reliability.
- Efficient Use: A space-saving and reliable solution for numerous industrial applications—the ideal choice over traditional photoelectric sensors.
Typical Applications for Fork-Type Photoelectric Sensors
Automation Technology:
Fork-type photoelectric sensors are versatile sensors used in a wide range of applications. Typical areas of application include, above all, automation technology and material handling. Here, they are used for object detection and counting—for example, in production lines, where they precisely detect products and thus provide a reliable data basis for control systems.
Packaging Industry:
In addition, fork-type photoelectric sensors are also used in the packaging industry to ensure that products are properly positioned before they are packaged. In all of these areas, the characteristics of PNP sensors play a crucial role, as they ensure a reliable and rapid response to changes in the environment.
Assembly and Feeding Automation:
Thanks to their fast switching frequency and precise object detection, fork-type photoelectric sensors are particularly well-suited for small parts such as screws, springs, or plastic clips, ensuring reliable part separation, a consistent cycle time, and fewer downtimes in automated assembly. They are used, for example, on vibratory conveyors, linear conveyors, and separation lines to monitor the parts feed, detect jams early, and synchronize the transfer to assembly or inspection stations.
The Right Fork-Type Photoelectric Sensor for Your Application
Counting small parts on feed rails:
You want to reliably detect and count small metal clips or stamped parts on a feed rail. In doing so, it is particularly important to avoid false signals caused by lateral play.
If your mechanical guide is very tight, we recommend the model AO905 with a 10-mm jaw opening. The narrow opening ensures that the workpiece is guided precisely and minimizes false triggers.
If you have more space or larger/thicker workpieces, we recommend fork-type photoelectric sensors with a wider fork span: e.g., 50 mm, 80 mm, or up to 120 mm. AO904 (120 mm) is ideal here; thanks to its large opening, it offers a high tolerance for mechanical deviations and makes installation easier when using more generously sized guides.
Identifying edges or narrow tabs:
You must reliably detect a narrow tab, a flag, or the edge of a label as it passes through.
The Red Light Version AO903 (80 mm, light/dark-switching) is your best choice when parts enter the light beam in a geometrically defined manner and you need a clean, logical connection to your PLC.
Large components:
You want to check whether components are present on the gripper or in an assembly fixture—the component must be detected before the next step in the process can proceed.
If you need a particularly large opening—for example, for wide beams or large assemblies—we recommend the model AO904 with a 120 mm fork width. Here, you'll enjoy maximum mechanical freedom.
Light/Dark Mode:
You want to clearly define your PLC logic and ensure that the output is active when the light beam is unobstructed or when it is interrupted—for example, for error or safety logic.
All fork-type photoelectric sensors in the autosen product line feature a light/dark switching function and are named accordingly in their product titles. This provides you with immediate clarity for your application and allows you to implement the logic easily and reliably.
Fork-type photoelectric sensor or other photoelectric sensors?
The choice between fork-type photoelectric sensors and other types of photoelectric sensors depends on the specific requirements of the application. Fork-type photoelectric sensors do not require time-consuming alignment and are well-suited for detecting small objects. Other types of photoelectric sensors, such as Reflective Light Barriers or Single-pass photoelectric sensors, may be more suitable for other applications where fork-type photoelectric sensors cannot be used due to design constraints or where objects need to be detected over long distances. It is important to understand the characteristics of the various types of photoelectric sensors and to make the right choice based on the specific requirements.
Frequently Asked Questions (FAQ) About Fork-Type Photoelectric Sensors
A fork-type photoelectric sensor is an optical sensor with a transmitter and a receiver housed in a fork. It detects objects when a light beam is interrupted, thereby generating a switching signal (e.g., for counting or stopping a conveyor belt).
PNP fork-type photoelectric sensors send a positive signal when the light beam is interrupted, while NPN fork-type photoelectric sensors send a negative signal. The choice between the two depends on the requirements of the electrical circuit. For more information, see here: PNP or NPN? - autosen.com
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