Patent Publication Number: US-2022219460-A1

Title: Adjustable print substance detector

Description:
BACKGROUND 
     Fluid level detectors can be utilized to determine a fluid level within a container. In some examples, fluid detectors can utilize a conductive liquid level sensor that utilizes a level of conductivity generated by a particular quantity of liquid surrounding the fluid detector. For example, a relatively higher level of liquid can correspond to a first level of conductivity and a relatively lower level of liquid can correspond to a second level of conductivity. In this way, the fluid detector can determine the level of a liquid within a container. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an example system for an adjustable print substance detector consistent with the present disclosure. 
         FIG. 2  is an example system for an adjustable print substance detector consistent with the present disclosure. 
         FIG. 3  is an example system for an adjustable print substance detector consistent with the present disclosure. 
         FIG. 4  is an example system for an adjustable print substance detector for a fill operation consistent with the present disclosure. 
         FIG. 5  is an example system for an adjustable print substance detector for a drain operation consistent with the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     In some examples, a printing device can generate an image such as text, pictures, or other features on a print medium. As used herein, a print medium can include a material that can receive a print substance from a printing device. For example, a print medium can include, but is not limited to paper, plastic, metal, among other materials. In some examples, the printing device can deposit the print substance on to specific locations of a print medium to generate the image. As used herein, a print substance can include a compound that can be deposited on the print medium by the printing device. For example, the print substance can include ink, toner, three dimensional (3D) print ink, and/or other materials that can be deposited on a print medium to generate an image. 
     In some examples, the printing device can utilize a reservoir to store the print substance. For example, the reservoir can be an enclosure that can receive and enclose ink that can be utilized by an inkjet printing device. In this example, the reservoir can be filled to store additional print substance or store a relatively large quantity of print substance for the printing device. In this example, the reservoir can be drained to reclaim unused print substance at the end of a workable life of a printing device. In this way, the reservoir can be utilized to provide continuous print substance with relatively less waste compared to previous systems. 
     In some examples, a conductive sensor can be positioned within the reservoir to determine the level of print substance stored within the reservoir. As used herein, a conductive sensor can include a device with a power source to provide power across electrodes to detect a resistance between the electrodes. In some examples, different levels of print substance can correspond to different resistance levels, which can be utilized to determine a quantity of print substance within the reservoir. In previous systems, a fixed conductive sensor can be utilized within a reservoir and extend from a top surface to a bottom surface of the reservoir. In some examples, the fixed conductive sensor can have a relatively low accuracy level, which can make it difficult to determine precise and/or accurate print substance levels. 
     The present disclosure relates to an adjustable print substance detector that can be adjusted to different heights within the reservoir. For example, a conductive sensor can be coupled to an actuator or motorized mechanism to raise or lower the conductive sensor to different levels within the reservoir. In some examples, the conductive sensor can be a sensor pin. As used herein, a sensor pin can include a sensor that is capable of providing an input voltage or current and/or receiving an output voltage or current. In some examples, the voltage or current provided by the sensor pin or detected by the sensor pin can include other signals, such as, but not limited to: waveform signals, pulse signals, and/or other types of signals that can be generated and received through a print substance. In some examples, the actuator can be utilized to adjust the sensor to a particular level such that a tip portion or end of the sensor is positioned at a particular level within the reservoir. In this way, the adjustable sensor can be positioned at a particular level within the reservoir to determine when the particular level is reached by the print substance which can be utilized to more accurately determine the level of the print substance within the reservoir. 
     The figures herein follow a numbering convention in which the first digit corresponds to the drawing figure number and the remaining digits identify an element or component in the drawing. Elements shown in the various figures herein may be capable of being added, exchanged, and/or eliminated so as to provide a number of additional examples of the present disclosure. In addition, the proportion and the relative scale of the elements provided in the figures are intended to illustrate the examples of the present disclosure and should not be taken in a limiting sense. 
       FIG. 1  is an example system  100  for an adjustable print substance detector consistent with the present disclosure. In some examples, the system  100  can be a part of a print substance detection system positioned within a printing device. For example, the system  100  can be part of an inkjet printing device that can utilize a print substance  104  stored within a print substance reservoir  102 . Although a print substance reservoir  102  that is capable of storing a print substance  104  is illustrated, examples of the present disclosure are not so limited. For example, other types of enclosures that are utilized to store materials could be implement the systems and devices described herein. In some examples, the print substance reservoir  102  can be an enclosure or container that can receive and store the print substance  104 . As described herein, the print substance  104  can be a compound that can be utilized by a printing device to generate images on a print medium. These compounds can include, but are not limited to, ink, toner, three-dimensional printing fluid, among other compounds. For example, the print substance  104  can be an ink substance that can be deposited on a print medium to generate an image on the print medium. 
     In some examples, the system  100  can include a sensor pin  106  that is coupled to an actuator  108 . As used herein, an actuator  108  can be a mechanical device to control movement of a device or system. In some examples, the actuator  108  can be utilized to move the sensor pin  106  in the directions of double arrow  114 . For example, the actuator  108  can be coupled to the sensor pin  106  and move in the direction of double arrow  114  to move the sensor pin  106  to a particular level within the print substance reservoir  102 . In some examples, the actuator  108  can be a motorized pulley system that can utilize a cord coupled to the sensor pin  106  and a motor to extend and retract the cord to alter the position of the sensor pin  106  within the print substance reservoir  102 . In other examples, the actuator  108  can include a hydraulic, pneumatic, or electric actuator that can be coupled directly or indirectly to the sensor pin  106  to alter the position of the sensor pin  106  in the direction of double arrow  114 . 
     In some examples, the system  100  can include a base portion  110  to couple the actuator  108  to the print substance reservoir  102 . In some examples, the base portion  110  can be utilized to support the actuator  108  and/or system associated with the actuator  108 . In some examples, the base portion  110  can be coupled to an exterior portion of the print substance reservoir  102 . For example, the print substance reservoir  102  can include an interior portion to store the print substance  104  and an exterior portion that is opposite of the interior portion. In some examples, the base portion  110  can be utilized to position the sensor pin  106  at a particular angle with respect to the print substance reservoir  102 . In some examples, the angle of the sensor pin  106  can be utilized to determine a level of the sensor pin  106 . For example, the angle of the sensor pin  106  can change the level or position of the tip of the sensor pin  106  as the actuator  108  moves the sensor pin  106  in the directions of double arrow  114 . Thus, in some examples, the controller  116  can utilize the angle of the sensor pin  106  provided by the base portion  110  to calculate a more precise level of a tip portion of the sensor pin  106 . 
     In some examples, the sensor pin  106  can extend from the exterior portion of the print substance reservoir  102  to the interior portion of the print substance reservoir  102 . In these examples, the system  100  can include an aperture to allow the sensor pin  106  to extend from the exterior position to the interior position of the print substance reservoir  102 . In some examples, the system  100  can include a seal  112  to prevent the print substance  104  from passing through the aperture utilized to allow the sensor pin  106  to extend from the exterior position to the interior position of the print substance reservoir  102 . As used herein, the seal  112  can be a liquid tight barrier that allows the sensor pin  106  to move in the directions of double arrow  114  without allowing a liquid to pass through. For example, the seal  112  can be a rubber grommet that can surround the sensor pin  106  to create a liquid tight seal around the sensor pin  106 . 
     In some examples, the system  100  can include a controller  116  communicatively coupled to the actuator  108 . In some examples, the controller  116  can be utilized to control particular functions of a printing device that includes or is coupled to the print substance reservoir  102 . In some examples, the controller  116  can be connected to the actuator  108  through a communication path  124 . For example, the controller  116  can be connected to the actuator  108  through a wired or wireless communication connection. In some examples, the communication path  124  can be utilized by the controller  116  to alter the position of the sensor pin  106  as described herein. For example, the controller  116  can send instructions through the communication path  124  to the actuator  108  to make the actuator  108  alter the position of the sensor pin  106 . 
     In some examples, the controller  116  can include a processing resource  118  and/or a memory resource  120  storing instructions to perform particular functions. A processing resource  118 , as used herein, can include a number of processing resources capable of executing instructions stored by a memory resource  120 . The instructions (e.g., machine-readable instructions (MRI), computer-readable instructions (CRI), etc.) can include instructions stored on the memory resource  120  and executable by the processing resource  118  to perform or implement a particular function. The memory resource  120 , as used herein, can include a number of memory components capable of storing non-transitory instructions that can be executed by the processing resource  118 . 
     The memory resource  120  can be in communication with the processing resource  118  via a communication link (e.g., communication path). The communication link can be local or remote to an electronic device associated with the processing resource  118 . The memory resource  120  includes instructions  122 . The memory resource  120  can include more or fewer instructions than illustrated to perform the various functions described herein. In some examples, instructions (e.g., software, firmware, etc.) can be downloaded and stored in memory resource  120  (e.g., MRM) as well as a hard-wired program (e.g., logic), among other possibilities. In other examples, the controller  116  can be hardware, such as an application-specific integrated circuit (ASIC), that can include instructions to perform particular functions. 
     The controller  116  can include instructions  122 , that when executed by a processing resource  118  can send instructions to the actuator  108  to adjust the distance of the sensor pin  106  based on an indication of an operation associated with the print substance reservoir  102 . As described herein, the controller  116  can send the instructions to the actuator  108  through a communication path  124 . In some examples, the actuator  108  can adjust the distance of the sensor pin  106  to a particular level within the print substance reservoir  102  to determine when a particular change in the level of the print substance  104  has occurred. For example, the actuator  108  can adjust the distance to a relatively higher level to determine when the addition of the print substance  104  has reached the relatively higher level. 
     In some examples, the controller  116  can receive an instruction that a particular operation is to be performed that is associated with the print substance reservoir  102 . As used herein, an operation associated with the print substance reservoir  102  can include an action that can correspond to an increase or decrease in the level of the print substance  104  within the print substance reservoir  102 . For example, the operation can include a filling operation, a draining operation, and/or a storage operation. In this example, a filling operation can include an action of adding a quantity of print substance  104  to the print substance reservoir  102 . In addition, a draining operation can include an action of removing a quantity or transporting a quantity of print substance  104  from the print substance reservoir  102 . Furthermore, a storage operation can include an action to maintain a level of print substance  104  within the print substance reservoir  102  for a quantity of time. 
     In some examples, the system  100  can be utilized to more precisely identify changes in the level of the print substance  104  stored within the print substance reservoir  102 . For example, the actuator  108  can be utilized to alter the position of the sensor pin  106  to a specific location and notify the controller  116  when the print substance  104  reaches a tip portion of the sensor pin  106 . In this way, the sensor pin  106  can be utilized to determine the presence or the absence of the print substance  104  and be more precise when determining the level of the print substance  104  within the print substance reservoir  102 . As described herein, previous systems can utilize a conductive sensor such as the sensor pin  106  to determine the level of a print substance  104  through a calculation utilizing the conductivity between electrodes of the conductive sensor. However, this calculation can be less accurate or precise than utilizing the sensor pin  106  to determine the presence or absence of the print substance  104  at a particular level adjusted by the actuator  108 . 
       FIG. 2  is an example system  200  for an adjustable print substance detector consistent with the present disclosure. In some examples, the system  200  can include the same or similar elements as system  100  as referenced in  FIG. 1 . For example, the system  200  can be part of a printing device and include a print substance reservoir  202  that includes a print substance  204 . In addition, the system  200  can include a sensor pin  206  coupled to an actuator  208  to alter the position of the sensor pin  206  within the print substance reservoir  202 . In some examples, the system  200  can include a base portion  210  that can include a seal  212  to prevent the print substance  204  from passing through the aperture to the exterior of the print substance reservoir  202 . 
     As described herein, the actuator  208  can be communicatively coupled to a controller  216  through a communication path  224 . In some examples, the controller  216  can send instructions to the actuator  208  through the communication path  224  and/or the sensor pin  206  can send sensor data to the controller  216 . As used herein, sensor data can include information sensed by the sensor pin  206 . For example, the sensor data can include a particular conductivity between electrodes of the sensor pin  206 . In other examples, the sensor data can include an indication of the presence or absence of print substance  204  contacting the surface of the sensor pin  206 . 
     In some examples, the controller  216  can be the same or similar device as controller  116  as referenced in  FIG. 1 . For example, the controller  216  can include a processing resource  218  and a memory resource  220  storing instructions  232 ,  234 ,  236  that can be executed by the processing resource  218  to perform particular functions. The controller  216  can include instructions  232 , that when executed by a processing resource  218  can determine an initiation of an operation to change a level of print substance  204  within the print substance reservoir  202 . 
     In some examples, the controller  216  can receive an indication that an operation to change the level of the print substance  204  is to be performed. For example, the controller  216  can receive an indication that print substance  204  is to be added to the print substance reservoir  202 . In this example, the controller  216  can receive authentication information from a filling device to open a filling aperture. As used herein, a filling aperture can include an aperture to receive additional print substance  204  from a filling device. In other examples, the controller  216  can receive an indication that a portion of the print substance  204  is to be drained from the print substance reservoir  202 . For example, the controller  216  can receive an indication that a portion of the print substance  204  is to be removed from the print substance reservoir  202  to reuse the print substance  204  with a different printing device. 
     The controller  216  can include instructions  234 , that when executed by a processing resource  218  can activate the actuator  208  to alter a level of the sensor pin  206  within the print substance reservoir  202 . In some examples, the sensor pin  206  can be positioned at a level of the print substance  204  and in response to the actuator  208  receiving the instruction from the controller  216  can be raised a distance  238 - 1  above the level of the print substance  204 . In some examples, the instructions provided to the actuator  208  can be an indication that a fill operation is to be performed. As described herein, a fill operation can include an addition of a quantity of print substance  204  to the print substance reservoir  202 . 
     In some examples, the distance  238 - 1  can correspond to a predicted or authorized quantity of print substance  204  to be added to the print substance reservoir  202  during a particular fill operation. For example, the controller  216  can receive an indication of a fill operation and send instructions through the communication path  224  to the actuator  208 . In this example, the instructions can indicate the distance  238 - 1  and the actuator can move the sensor pin  206  in an upward direction of double arrow  214  as illustrated in  FIG. 2 . In this example, the controller  216  can authorize the filling operation to proceed or begin when the sensor pin  206  has been moved the distance  238 - 1 . In this example, the sensor pin  206  can be utilized to determine when the fill operation should end based on an indication that the print substance  204  is present at the adjusted level. 
     In some examples, the distance  238 - 1  can correspond to a particular quantity of print substance  204  to be added to the print substance reservoir  204 . For example, the controller  216  can authorize that a particular quantity of print substance  204  is to be added to the print substance reservoir  202 . In this example, the controller  216  can determine the distance  238 - 1  and/or distance  238 - 2  that will be reached by the print substance  204  within the print substance reservoir  202  with the addition of the particular quantity of print substance  204 . 
     The controller  216  can include instructions  236 , that when executed by a processing resource  218  can determine when the operation is completed based on the sensor pin  206  interacting with the print substance  204  within the print substance reservoir  202 . As described herein, the controller  216  can send instructions to the actuator  208  to raise the level of the sensor pin  206  a distance  238 - 1  or to a distance  238 - 2  from a base or bottom of the print substance reservoir  202 . In some examples, the controller  216  can determine that a fill operation is completed when the print substance  204  level within the print substance reservoir  202  reaches the sensor pin  206 . In a similar way, the controller  216  can alter the position of the sensor pin  206  to a lower level than a current level of the print substance  204 . In this example, the operation can be a drain operation and the controller  216  can determine that the drain operation has completed when the sensor pin  206  detects an absence of print substance  204  at the altered level of the sensor pin  206 . 
     The system  200  can be part of a printing device or utilized by a printing device to more accurately monitor a level of print substance  204  within a print substance reservoir  202 . In addition, the system  200  can be utilized to more closely monitor changes in the level of the print substance  204  within the print substance reservoir  202  by continually adjusting the level of the sensor pin  206  to the level of the print substance  204 . For example, the controller  216  can adjust the level of the sensor pin  206  to a point when the sensor pin  206  detects the level of print substance  204  and identify relatively small changes in the level of print substance  204  (e.g., the level of print substance  204  drops below the sensor pin  206 , etc.). 
       FIG. 3  is an example system  300  for an adjustable print substance detector consistent with the present disclosure. In some examples, the system  300  can include the same or similar elements as system  200  as referenced in  FIG. 2  and/or system  100  as referenced in  FIG. 1 . For example, the system  300  can be part of a printing device and include a print substance reservoir  302  that includes a print substance  304 . In addition, the system  300  can include a first sensor pin  306 - 1  coupled to an actuator  308  to alter the position of the first sensor pin  306 - 1  within the print substance reservoir  302 . In some examples, the system  300  can include a second sensor pin  306 - 2  that is fixed to a base portion  310 . In some examples, the system  300  can include a base portion  310  that can include a seal  312  to prevent the print substance  304  from passing through the aperture to the exterior of the print substance reservoir  302 . 
     As described herein, the actuator  308  can be communicatively coupled to a controller  316  through a communication path  324 . In some examples, the controller  316  can send instructions to the actuator  308  through the communication path  324 . In other examples, the first sensor pin  306 - 1  and/or the second sensor pin  306 - 2  can send sensor data to the controller  316 . As used herein, sensor data can include information sensed by the first sensor pin  306 - 1  and/or the second sensor pin  306 - 2 . For example, the sensor data can include a particular conductivity between electrodes of the first sensor pin  306 - 1  and/or the second sensor pin  306 - 2 . In other examples, the sensor data can include an indication of the presence or absence of print substance  304  contacting the surface of the first sensor pin  306 - 1  and/or the second sensor pin  306 - 2 . 
     In some examples, the first sensor pin  306 - 1  and the second senor pin  306 - 2  can be coupled to a sensing circuit. In some examples, the controller  316  can include a sensing circuit and utilize the sensing circuit to analyze the sensor data provided by the first sensor pin  306 - 1  and/or the second sensor pin  306 - 2 . As used herein, a sensing circuit can include a circuit that can compare an input current or voltage to an output current or voltage from a sensor. For example, an input current or voltage can be applied to the second sensor pin  306 - 2 . In this example, the input current or voltage can be input into the print substance  304  through the second sensor pin  306 - 2 . In this example, the first sensor pin  306 - 1  can include a voltage or current detector that can be utilized to measure a voltage or current at the first sensor pin  306 - 1 . As described further herein, the presence or absence of print substance  304  can be determined based on a detected voltage or current. As described herein, the first sensor pin  306 - 1  and/or second sensor pin  306 - 2  can utilize a voltage or current as a signal to determine a level of the print substance  304 . However, other signals can be utilized by the first sensor pin  306 - 1  and/or second sensor pin  306 - 2 . For example, a waveform signal and/or pulsed signal can be utilized to determine the level of the print substance  304  in a similar way as described herein. 
     In some examples, the first sensor pin  306 - 1  can be utilized to apply a voltage or current to the print substance  304  and the second sensor pin  306 - 2  can be utilized to detect a voltage or current. For example, a voltage or current can be applied to the first sensor pin  306 - 1 . In this example, the second sensor pin  306 - 2  can include a voltage or current sensor to determine a voltage or current of the print substance  304 . In this example, the detected voltage or current at the second sensor pin  306 - 2  can increase when the first sensor pin  306 - 1  is in contact with the print substance  304  and decrease when the first sensor pin  306 - 1  is not in contact with the print substance  304 . In some examples, a threshold voltage or threshold current can be utilized to determine when the first sensor pin  306 - 1  is in contact with the print substance  304 . In this way, a more accurate level of the print substance  304  can be determined. 
     In some examples, the first sensor pin  306 - 1  can be a sense pin and the second sensor pin  306 - 2  can be a driver pin. As used herein, a sense pin can be a sensor pin that that is utilized to determine a voltage or current applied within the print substance  304  that is applied by a driver pin (e.g., second sensor pin  306 - 2 , etc.). As used herein, a driver pin can be a pin that is utilized apply an input voltage or current into the print substance  304 . In some examples, the sense pin can be coupled to the actuator  308  and the driver pin can be in a fixed location coupled to the base portion  310 . In other examples, the sense pin can be in a fixed location and the driver pin can be coupled to the actuator  308 . In some examples, the sense pin can include a voltage or current sensor to detect a voltage or current within the print substance  304 . 
     In some examples, the system  300  can utilize the sense pin to determine when the detected voltage or current by the sense pin exceeds a threshold value (e.g., ink threshold value, etc.). For example, the detected voltage or current can be below the threshold value when the sense pin is not positioned within or in contact with the print substance  304  since the applied voltage or current from the driver pin is not received by the sense pin when the sense pin is not in contact with the print substance  304 . In this example, the detected voltage or current by the sense pin can be above the threshold value when the sense pin is in contact with the print substance  304  since the applied voltage or current applied by the driver pin is received by the sense pin through the print substance  304 . 
     In some examples, the first sensor pin  306 - 1  can be adjustable utilizing the actuator  308  as described herein. In this way, the first sensor pin  306 - 1  can be utilized to monitor relatively minor changes in the level of print substance  304  within the print substance reservoir  302 . In these examples, the second sensor pin  306 - 2  can be position in a fixed location as described herein. For example, the second sensor pin  306 - 2  can be positioned in a fixed location with a fixed tip  346 - 2  position within the enclosure of the print substance reservoir  302 . 
     Although a single first sensor pin  306 - 1  and a single second sensor pin  306 - 2  are illustrated in  FIG. 3 , examples of the present disclosure are not so limited. For example, the system  300  can include a plurality of sensor pins utilized in a similar way as the second sensor pin  306 - 2 . For example, the system  300  can include a plurality of fixed sensor pins that are fixed at different levels within the print substance reservoir  302 . In this example, the plurality of fixed sensors can be positioned at different threshold levels (e.g., maximum level, minimum level, etc.) within the print substance reservoir  302 . In addition, the system  300  can include a plurality of adjustable sensor pins similar to the first sensor pin  306 - 1 . For example, the actuator  308  can be coupled to a plurality of sensor pins to adjust the plurality of sensor pins. In some examples, the plurality of sensor pins coupled to the actuator  308  can be at different levels within the print substance reservoir  302 . In some examples, the plurality of sensor pins coupled to the actuator can be adjusted independently or simultaneously. 
     In some examples, the controller  316  can be the same or similar device as controller  216  as referenced in  FIG. 2 , and/or controller  116  as referenced in  FIG. 1 . For example, the controller  316  can include a processing resource  318  and a memory resource  320  storing instructions  342 ,  344  that can be executed by the processing resource  318  to perform particular functions. The controller  316  can include instructions  342 , that when executed by a processing resource  318  can instruct the actuator  308  to alter the tip  346 - 1  position of the first sensor pin  306 - 1  to a first distance  338 - 1  from a base of the enclosure (e.g., print substance reservoir  302 , etc.) in response to a first operation. In some examples, the enclosure can be a storage location of the print substance reservoir  302 . For example, the enclosure can be utilized to store the print substance  304  as described herein. 
     As described herein, the first sensor pin  306 - 1  can be coupled to the actuator  308  and be adjustable within the enclosure of the print substance reservoir  302 . For example, the actuator  308  can move the first sensor pin  306 - 1  in the directions of double arrow  314 . In this way, a tip  346 - 1  of the first sensor pin  306 - 1  can be adjusted to different levels within the enclosure of the print substance reservoir  302 . As described herein, the actuator  308  can adjust the first sensor pin  306 - 1  such that the tip  346 - 1  of the first sensor pin  306 - 1  is positioned at a particular level based on a corresponding operation to be performed. As described herein, the operation can be a fill operation, a drain operation, a storage operation, and/or other type of operation that can alter a level of the print substance  304  within the enclosure of the print substance reservoir  302 . 
     In some examples, the first operation can be a fill operation. As described herein, a fill operation can include an action to add print substance  304  to the print substance reservoir  302 . In some examples, the actuator  308  can receive an indication from the controller  316  through the communication path  324  that the first operation is a fill operation. In these examples, the actuator  308  can adjust the tip  346 - 1  of the first sensor pin  306 - 1  to the first distance  338 - 1 . In these examples, the fill operation can be performed and the tip  346 - 1  of the first sensor pin  306 - 1  can determine the presence of the print substance  304  at the completion of the fill operation. In other examples, the notification can be generated by a sensing circuit coupled to the controller  316 . 
     In some examples, the first distance  338 - 1  can correspond to a predicted level of the print substance at the completion of the fill operation. In this way, the tip  346 - 1  of the first sensor pin  306 - 1  can determine the presence of the print substance  304  upon the completion of the fill operation. That is, the first sensor pin  306 - 1  can be utilized to indicate when the first operation and/or the fill operation is complete. In other examples, the first distance  338 - 1  can correspond to a threshold level of print substance  304 . For example, the first distance  338 - 1  can correspond to a level near an overflow level. In this example, the tip  346 - 1  of the first sensor pin  306 - 1  can be utilized to generate a notification when the tip  346 - 1  detects the presence of the print substance  304 . In this way, the system  300  can prevent the enclosure of the print substance reservoir  302  from being overfilled with the print substance  304 . 
     The controller  316  can include instructions  344 , that when executed by a processing resource  318  can instruct the actuator  308  to alter the tip  346 - 1  position of the first sensor pin  306 - 1  to a second distance  338 - 2  from the base of the enclosure in response to a second operation. In some examples, the second operation can be a drain operation. As described herein, the drain operation can include an action to remove a portion of the print substance  304  from the enclosure of the print substance reservoir  302 . For example, the drain operation can be an action to transport a portion of the print substance  304  to a different area of the printing device or reclaim the print substance  304  from the print substance reservoir  302 . In some examples, the actuator  308  can receive an instruction from the controller  316  that the second operation is a drain operation. In these examples, the actuator  308  can alter the first sensor pin  306 - 1  such that the tip  346 - 1  is positioned at a second distance  338 - 2 . 
     In some examples, the second distance  338 - 2  can be a predicted level of the print substance  304  when the drain operation is completed. For example, the drain operation can be a particular quantity of print substance that can correspond to a particular level being removed from the enclosure of the print substance reservoir  302 . In this way, the tip  346 - 1  of the first sensor pin  306 - 1  can be utilized to determine when the second operation and/or a drain operation has been completed. In other examples, the second distance  338 - 2  can be a low level threshold for the enclosure of the print substance reservoir  302 . For example, the tip  346 - 1  of the first sensor pin  306 - 1  can be positioned to provide a notification when the first sensor pin  306 - 1  detects the absence of print substance  304  to prevent a level of the print substance  304  from falling below the low level threshold, which can damage the print substance reservoir  302  and/or a system utilized to drain the print substance reservoir  302  (e.g., pumps, etc.). 
     As described herein, the first sensor pin  306 - 1  can provide a notification when the first sensor pin  306 - 1  detects print substance  304  at a fill level during a fill operation. As used herein, the fill level can be a predicted level of print substance  304  within the print substance reservoir  302  after print substance  304  is added during a fill operation. In addition, the first sensor pin  306 - 1  can provide a notification when the first sensor pin  306 - 1  detects the absence of print substance  302  at a drain level during a drain operation. As used herein, the drain level can be a level of print substance  304  within the print substance reservoir  302  after the print substance  304  is removed during the drain operation. 
     The system  300  can be part of a printing device or utilized by a printing device to more accurately monitor a level of print substance  304  within a print substance reservoir  302 . In addition, the system  300  can be utilized to more closely monitor changes in the level of the print substance  304  within the print substance reservoir  302  by continually adjusting the level of the sensor pin  306  to the level of the print substance  304 . In addition, the system  300  can be utilized to more accurately determine when the level of the print substance  304  exceeds or falls below a threshold level. 
       FIG. 4  is an example system  400 - 1 ,  400 - 2  for an adjustable print substance detector for a fill operation consistent with the present disclosure. In some examples, the system  400 - 1 ,  400 - 2  can include the same or similar elements as system  300  as referenced in  FIG. 3 , system  200  as referenced in  FIG. 2  and/or system  100  as referenced in  FIG. 1 . In some examples, the system  400 - 1  can be a representation at a first time and the system  400 - 2  can be a representation at a second time. For example, the first time can be prior to an operation and the second time can be upon completion of the operation. In some examples, the operation can be a fill operation to increase a quantity of prints substance  404 - 1 ,  404 - 2 . 
     In some examples, the actuator  408 - 1  can alter the position of the sensor pin  406 - 1  to a level  452 - 1  when there is an indication of a fill operation. For example, a controller can instruct the actuator  408 - 1  to alter the distance of the sensor pin  406 - 1  to a fill level based on an indication of the fill operation. As used herein, a fill level can include a level within the print substance reservoir  402 - 1  that is predicted to be the level of the print substance  404 - 1  after the fill operation. Thus, the level  452 - 1  can be a level that is relatively higher than a current level of the print substance  404 - 1  within the print substance reservoir  402 - 1 . As described herein, the sensor pin  406 - 1  can be adjusted to the level  452 - 1  based on a determination of a quantity of print substance  404 - 1  to be added during the fill operation. In this way, the sensor pin  406 - 1  can be utilized to determine when the fill operation is complete. 
     The system  400 - 2  can illustrate a time when the fill operation is complete. For example, the system  400 - 2  can illustrate that print substance  404 - 2  has reached the level  452 - 2  and is interacting with a portion of the sensor pin  406 - 2 . In this way, the sensor pin  406 - 2  can provide a notification that the level of the print substance  404 - 2  has reached the level  452 - 2  and/or a tip portion of the sensor pin  406 - 2 . 
       FIG. 5  is an example system  500 - 1 ,  500 - 2  for an adjustable print substance detector for a drain operation consistent with the present disclosure. In some examples, the system  500 - 1 ,  500 - 2  can include the same or similar elements as system  400 - 1 ,  400 - 2  as referenced in  FIG. 4 , system  300  as referenced in  FIG. 3 , system  200  as referenced in  FIG. 2  and/or system  100  as referenced in  FIG. 1 . In some examples, the system  500 - 1  can be a representation at a first time and the system  500 - 2  can be a representation at a second time. For example, the first time can be prior to an operation and the second time can be upon completion of the operation. In some examples, the operation can be a drain operation. 
     In some examples, the actuator  508 - 1  can alter the position of the sensor pin  506 - 1  to a level  564 - 1  when there is an indication of a drain operation. Thus, the level  564 - 1  can be a level that is relatively lower than a current level  562 - 1  of the print substance  504 - 1  within the print substance reservoir  502 - 1 . As described herein, the sensor pin  506 - 1  can be adjusted to the level  564 - 1  based on a determination of a quantity of print substance  504 - 1  to be removed during the drain operation. In this way, the sensor pin  506 - 1  can be utilized to determine when the drain operation is complete. 
     The system  500 - 2  can illustrate a time when the drain operation is complete. For example, the system  500 - 2  can illustrate that print substance  504 - 2  has reached the level  564 - 2  and is no longer interacting with a portion of the sensor pin  506 - 2 . In this way, the sensor pin  506 - 2  can provide a notification that the level of the print substance  504 - 2  has reached the level  546 - 2  and/or a tip portion of the sensor pin  506 - 2 . 
     The above specification, examples and data provide a description of the method and applications and use of the system and method of the present disclosure. Since many examples can be made without departing from the spirit and scope of the system and method of the present disclosure, this specification merely sets forth some of the many possible example configurations and implementations.