Load measuring device and load measuring method

A load measuring device is provided with load sensor, data logger, and measurement start switch on body. When switch section is pressed down by a suction nozzle, load sensor outputs detection voltage to data logger in accordance with the size of the pressing load. Data logger records detection voltage for a specified time only from the time it starts receiving high level start recording signal from measurement start switch. By this, data logger does not record detection voltage until high level start recording signal is received from measurement start switch, thus does not incorrectly record vibrations and the like during conveyance as the load.

TECHNICAL FIELD

The present application relates to a load measuring device for measuring a load.

BACKGROUND ART

With a component mounter that mounts an electronic component (also referred to as simply as “component”) on a circuit board (also referred to as simply as “board”), in order to curtail problems such as board damage and electrical connection problems, there is a requirement to set an appropriate value for a load with which a component is pressed against a board. Also, as recent components are more integrated, smaller, and thinner, it is desirable to more accurately manage the load with which components are pressed. With respect to this, there are load measuring devices for measuring a pressing load on a component by a suction nozzle of a mounting head when mounting the component on a board (for example, see patent literature 1).

The load measuring device disclosed in patent literature 1 is connected via a connection cord to a personal computer that displays measurement results or the like. With the load measuring device, the resistance value of an internal strain gauge changes as a load is applied to a suction nozzle. The load measuring device outputs a signal (such as a voltage) to the personal computer in accordance with the changing resistance value of the strain gauge.

CITATION LIST

Patent Literature

BRIEF SUMMARY

Technical Problem

Technological developments have led to the measuring accuracy of load measuring devices improving as circuit designs are improved and measuring methods changed. For example, among piezoelectric load sensors that use the piezoelectric properties of quartz, there are sensors with high detection accuracy. Thus, one may consider using such a high accuracy load sensor when setting and managing pressing loads of suction nozzles.

However, a load measuring device as given above, for example, is mounted on a measurement-use board. A mounted measurement-use board, similar to a normally produced board, is conveyed along a conveyance path inside a component mounter from an upstream side to a work position at which components are mounted on a board. The measurement-use board is held at a work position by a board holding section. In this state, the load measuring device measures the pressing load of the suction nozzle. Thus, a user performing measurements must convey the load measuring device along the conveyance path. Therefore, the load measuring device, when using a measuring method with high detection accuracy or sensitivity, may incorrectly measure as a load an external force due to vibration during fixing work as the board is held or while it is being conveyed along the conveyance path.

The present disclosure takes account of such circumstances and an object thereof is to provide a load measuring device and a loading measuring method that curtail mistaken measurements.

Solution to Problem

To solve the above problems, a load measuring device of the present disclosure is for measuring a pressing load applied by a mounting head to a component in a mounter having the mounting head that applies a pressing force when mounting the component on a board, the load measuring device including: a body; a start command section provided on the body, the start command section being configured to issue a command to start acquiring the pressing load based on a start instruction from the mounter; and a load acquiring section configured to acquire the pressing load in accordance with the command from the start command section.

Also, the present disclosure is not limited to a load measuring device and may be realized as a load measuring method for measuring a pressing load.

Advantageous Effects

A load measuring device of the present disclosure is provided with a body, a start command section provided on the body, and a load acquiring section. The start command section issues a command to the load acquiring section to start acquiring the pressing load based on the start instruction from the mounter. The load acquiring section, based on the command from the start command section, acquires the pressing load of the pressing force applied by the mounting head. Thus, the load acquiring section does not perform entering, saving or the like of the pressing load until receiving the command. That is, even if such pressing loads are received, they are not processed as valid data. Accordingly, with this load measuring device, it is possible to perform acquiring in accordance with the timing at which pressing force is applied by the mounting head without acquiring a pressing load during conveyance along the conveyance path or the like. As a result, mistaken measurements of the pressing load are curtailed, and it is possible to appropriately measure the pressing load due to the mounting head.

DESCRIPTION OF EMBODIMENTS

A mounter that measures a load using a load measuring device of the present disclosure is described below in detail with reference to the figures.

Configuration of Substrate Work System

FIG. 1schematically shows the configuration of board work system10provided with mounter11of an embodiment. Board work system10is a system for mounting components on circuit board (also referred to as “board”) CB. Board work system10includes one component mounting line12. Board CB is conveyed along component mounting line12from left to right as shown inFIG. 1, with mounting related work being performed by various machines. Component mounting line12is configured from multiple (in this embodiment, four) mounters11, solder printer13, inspection machine14, reflow machine15, and board handlers17that are connected. The machines are arranged adjacent to each other in a single line and overall control is performed by production management computer19. Note that, in the descriptions below, the X-axis direction refers to the direction in which the machines are lined up and the Y-axis direction refers to a direction that is parallel to the flat surface of board CB and perpendicular to the X-axis direction.

Solder printer13prints solder paste on board CB. Mounters11mount components on the board CB printed with solder paste. Details of mounters11are described later. Inspection machine14inspects for things such as the state of components mounted on board CB, and the presence of foreign matter. Reflow machine15heats the solder paste so that it melts, then allows it to cool and harden, so as to complete the mounting of the components. Board handlers17are provided in component mounting line12upstream and downstream of each of the mounters11. Board handlers17convey boards CB to the next machine, hold boards CB on standby, or flip boards CB.

Configuration of Mounters

FIG. 2is a plan view of mounter11. As shown inFIG. 2, mounter11includes conveyance device20, mounting head moving device (hereinafter also referred to as “moving device”)22, mounting head24, and supply device26.

Conveyance device20includes conveyor31that extends in the X-axis direction. Board CB is held and conveyed in the X-axis direction by conveyor31.FIG. 3shows a work position of mounter11in a cross section taken along a plane perpendicular to the X-axis direction. As shown inFIG. 3, conveyor31includes conveyor belts33, stoppers35, and clampers36. A pair of conveyor belts33is provided separated by a specified distance in the Y-axis direction, and the conveyor belts are rotated by the driving of an electromagnetic motor (not shown). Conveyor belts33rotate with board CB loaded on them, such that board CB is conveyed to a specified work position (for example, the position shown inFIG. 2).

Stopper35extends in the X-axis direction and has an L-shaped cross section. Clampers36sandwich board CB at the work position, and are provided at positions facing stoppers35in the vertical direction. Conveyor31rotates conveyor belts33to convey board CB to the work position and raise clampers36. Board CB is sandwiched between clampers36and stoppers35so as to be fixedly held at the work position. Note that, the thickness of board CB in the vertical direction is, for example, 2 mm.

Also, mounter11adjusts the rail width of conveyor31(the distance in the Y-axis direction between conveyor belts33, stoppers35, and clampers36) in accordance with the board width W1of board CB being produced. Stoppers35are provided facing the edge of board CB being conveyed separated by gap38. Thus, conveyor31is able to convey board CB smoothly.

Also, raising and lowering table43capable of being raised and lowered by drive section41(for example, an air cylinder) is provided at the work position of mounter11. Raising and lowering table43is plate-shaped and is provided below conveyor31and within conveyor31in the Y-axis direction. Backup base44is provided on raising and lowering table31in an exchangeable manner. Backup base44is plate-shaped and can be exchanged based on the type (for example, size) of board CB. Multiple backup pins46stand upright on the upper surface of backup base44. Mounter11, when mounting components, drives drive section41to raise raising and lowering table43, such that backup pins46contact the underside of board CB held in position by stoppers35and clampers36. Thus, backup pins46support board CB such that it does not bend during component mounting.

Also, as shown inFIG. 2, moving device22includes X-axis direction slide mechanism50and Y-axis direction slider mechanism52. X-axis direction slide mechanism50has X-axis slider56provided on base54so as to be movable in the X-axis direction. X-axis slider56is moved to any position in the X-axis direction by the driving of an electromagnetic motor (not shown). Also, Y-axis direction slide mechanism52includes Y-axis slider60. Y-axis slider60is provided on a side surface of X-axis slider56so as to be movable in the Y-axis direction. Y-axis slider60is moved to any position in the Y-axis direction by the driving of an electromagnetic motor (not shown). Mounting head24is attached to Y-axis slider60. According to such a structure, mounting head24is moved to any position on base54by moving device22. Note that, mounting head24is removable from Y-axis slider60and can be exchanged with another head in accordance with the work to be performed.

Mounting head24is for mounting components on board CB. Mounting head24includes suction nozzle70provided on a lower surface of mounting head24. Suction nozzle70is connected to a positive and negative pressure supply device (not shown) via a negative pressure air and positive pressure air passage. Suction nozzle70picks up and holds a component using negative pressure, and releases the held component using positive pressure. Also, mounting head24has a raising and lowering device (not shown) that raises and lowers suction nozzle70. Mounting head24changes the vertical position of suction nozzle70that holds a component using the raising and lowering device. Note that, suction nozzle70is removably attached to mounting head24, such that suction nozzle70can be exchanged in accordance with the component to be held.

Supply device26is a feeder type supply device that includes multiple tape feeders72. Tape feeders72house taped components in a wound state. Taped components are components that have been put into tape. Tape feeder72feeds taped components using a feeding device (not shown) so as to supply components to the supply position.

Mounting Work by Mounter

Mounter11uses the above configuration to perform work of mounting components on board CB. More specifically, mounter11uses conveyance device20to convey board CB conveyed from upstream board handler17to the work position. Stoppers35and clampers36fixedly hold board CB at the work position. Also, tape feeder72feeds taped components so as to supply components to the supply position. Mounting head24moves above the supply position of tape feeder72and picks up and holds a component using suction nozzle70. Mounting head24then moves about board CB arranged at the work position and mounted the held component on board CB. When mounter11has completed work of mounting components, the downstream board handler17conveys board CB to a downstream machine.

Configuration of Load Measuring Device

Described next is the configuration of load measuring device81of an embodiment.FIG. 4shows a plan view of load measuring device81of the embodiment.FIG. 5is a cross section view of load measuring device81and shows load measuring device81arranged at the work position of mounter11. That is, compared toFIG. 3,FIG. 5shows load measuring device81arranged in place of board CB. Also,FIG. 6shows the electrical configuration of load measuring device81.

Note that, inFIG. 5, backup base44is shown with backup pins46removed. This enables a larger space to be maintained between backup base44and conveyor31. Also, in descriptions below, positions and the like of components of load measuring device81are given using directions (X-axis direction and Y-axis direction) when load measuring device81is conveyed.

As shown inFIGS. 4 and 5, load measuring device81includes body83and holding plates85and86attached to an upper surface of housing83. Body83is substantially rectangular when viewed from above. Body83extends in the X-axis direction and the Y-axis direction and is a thick plate with a specified thickness in the vertical direction. Thickness L2(refer toFIG. 5) in the vertical direction of body83is, for example, 50 mm. Note that, in a case in which load measuring device81is configured as a thin item, load measuring device81may be conveyed by conveyor with backup pins46remaining attached to backup base44.

Holding plates85and86are provided at either end in the Y-axis direction at upper surface83A of body83. Holding plates85and86are plates extending in the X-axis direction while having approximately the same width in the Y-axis direction. Thickness L3in the vertical direction of holding plates85and86is the same (for example, 2 mm) as the thickness of board CB shown inFIG. 3. Holding plates85and86extend along the flat plane of upper surface83A towards the outside from the edge of body83in the Y-axis direction. Conveyor belts33support an underside of a portion of holding plates85and86that protrudes towards the outside in the Y-axis direction. Also, each of holding plates85and86is fixed to body83by multiple (in this embodiment, five) screws88.

Conveyor31conveys load measuring device81in a state with the portions of holding plates85and86that protrude towards the outside of body83loaded on conveyor belts33. Width W2of load measuring device81in the Y-axis direction is approximately the same as board width W1(refer toFIG. 3) of board CB. Therefore, stoppers35are provided facing holding plates85and86of load measuring device81being conveyed separated by gap38. Thus, conveyor31is able to convey load measuring device81smoothly.

Also, chamfer sections85A are formed in holding plate85on an external edge in the Y-axis direction at both ends in the X-axis direction. Similarly, chamfer sections86A are formed in holding plate86. By providing chamfer sections85A and86A in holding plates85and86, the problem of holding plates85and86catching on stoppers35of conveyor31and thereby hindering conveyance is curtailed. This also enables conveyor31to convey load measuring device81smoothly.

As shown inFIG. 6, load measuring device81includes items such as power source91, power switch93, load sensor95, data logger97, measurement start switch99, and external interface101. Power source91, for example, is a rechargeable battery that supplies direct current voltage V1to load sensor95and data logger97.

Power source switch93is used to switch between supplying voltage V1from power source91to load sensor95and the like, and stopping the supply. Power switch93is attached to side surface83B (refer toFIG. 5) of body83. Power switch93, for example, is a slide switch or a tact switch (registered trademark), and causes on/off signal S1to be output to power source91based on operations of a user. Power switch93starts supply of voltage V1to load sensor95and the like, or stops the supply, in accordance with the on/off signal S1from power switch93.

Load sensor95detects a pressing force (such as a force that presses a component) of suction nozzle70of mounting head24. Load sensor95, for example, is a piezoelectric load sensor and is configured from a single axis sensor that detects only the load in the vertical direction. Note that, load sensor95may by another type of load sensor, such as a strain gauge. Also, load sensor95may be configured from a multiple axis load sensor capable of detecting the load in multiple directions.

Load sensor95includes switch section95A attached to upper surface83A of body83. As shown inFIG. 4, measurement plate83is provided on upper surface83A at a position adjacent to holding plate86. Measurement plate83C is approximately a long rectangle when viewed in the vertical direction. Through-holes83D are provided piercing measurement plate83C in the vertical direction. Switch section95A is approximately cylindrical, and is inserted through through-hole83D in the vertical direction. With load sensor95, when switch section95A is pressed down by suction nozzle70, compressive stress occurs inside the quartz piezoelectric element (not shown) due to the load, and load sensor95outputs analog detection voltage V2in accordance with the size of the stress. Load sensor95outputs detection voltage V2to data logger97. Note that, load sensor95may be provided with an amplifier or the like that amplifies detection voltage V2.

Measurement start switch99includes pressure switch99A that can be operated by suction nozzle70. Pressure switch99A is provided at a position on measurement plate83C adjacent to switch section95A. As shown inFIG. 5, measurement start switch99, for example, is off when pressure switch99A is not being pressed by suction nozzle70, and outputs low level start recording signal S2to data logger97. Further, measurement start switch99, for example, when pressure switch99A is pressed down to a specified reference position by suction nozzle70, outputs high level start recording signal S2to data logger97.

Data logger97, is set to not perform recording of detection voltage V2received from load sensor95while receiving low level start recording signal S2. Also, data logger97is set to record detection voltage V2for a specified time only from the time it starts receiving high level start recording signal S2from measurement start switch99. This specified time is set according to an operating sequence of suction nozzle70, more specifically, is set according to the actual work state and operating state when mounting components on board CB. With the above configuration, data logger97records detection voltage V2received from load sensor95for a specified time only from when pressure switch99A is pressed by suction nozzle70. Data logger97records the received detection voltage V2as load data. Thus, it is possible to drastically reduce unnecessary data from before and after load measurement.

External interface101is for connecting to an external device such as external PC201. As shown inFIG. 5, external interface101, for example, is attached to side surface83B below power switch93. For example, an interface that conforms to the USB (Universal Serial Bus) standard may be used as external interface101.

For example, a user may read load data from data logger97using external PC201connected to external interface101. Thus, a user can display and check desired load data on external PC201. For example, a user can check whether the pressing load of suction nozzle70is normal based on whether the peak value of the load data is within a desired range.

Also, as shown inFIG. 4, two fiducial marks111for detecting an accurate position of load measuring device81fixed at the work position, that is, for detecting an accurate position of switch section95A and pressure switch99A, are provided on upper surface83A. Fiducial marks111are provided at each end to sandwich measurement plate883C at both ends in the X-axis direction. Also, code section113positioned adjacent to holding plate85is provided on upper surface83A. Code section113, for example, is a 2D code for distinguishing load measuring device81from board CB. Note that, code section113may be another form of identification information such as a barcode, so long as it allows distinguishing between load measuring device81and board CB.

Mounter11captures code section113and fiducial marks111provided on upper surface83A of load measuring device81using a camera (not shown) of mounting head24and acquires the image data. Mounter11detects accurate coordinates (position in the X-axis direction and the Y-axis direction) of positioned load measuring device81by image processing the captured image data of fiducial marks111. Also, mounter11is able to determine whether an item is load measuring device81by image processing image data captured of code section113.

Load Measuring Processing

A load measuring method of load measuring device81is described next with reference toFIG. 7.FIG. 7is an example of load measuring. First, in step11(hereinafter step is abbreviated to “S”), a user operates power switch93of load measuring device81to turn it on. Power source81starts supplying voltage V1to load sensor95and data logger97in accordance with the receiving on/off signal S1that represents an on state.

A user arranges load measuring device81with the power turned on at an upstream side of component mounting line12of board work system10. The user, for example, uses production management computer19to execute control data for selectively operating only the mounter11on which it is desired to perform measurement. Thus, board work system10conveys load measuring device81from an upstream side of component mounting line12(a solder printer13side) to a work position of the measurement target mounter11. Also, board work system10does not perform work using solder printer13or the like while load measuring device81is being conveyed. And, the measurement target mounter11, based on the control data acquired form production management computer19operates mounting head24and suction nozzle70and performs the following work with respect to load measuring device81.

Here, for example, load measuring device81, while being conveyed through component mounting line12, is subject to vibrations from various machines such as board handlers17. Thus, load sensor95, when having high detection accuracy and sensitivity may incorrectly detect this vibration as load. However, while load measuring device81of the present embodiment is being conveyed, data logger97is receiving lower level start recording signal S2, so does not record any detected voltage V2received from load sensor95. Thus, load measuring device81curtails the incorrect recording of vibrations caused by conveyance as load in data logger97. Also, with load measuring device81of the present embodiment, because incorrect measurements during conveyance are corrected, it is possible to use a sensor with a high detection level and sensitivity, for example, a piezoelectric sensor.

Next, the measurement target mounter11loads the load measuring device81from board handler17on the upstream side (S13). Mounter11adjusts the conveyance speed of load measuring device81in accordance with detection results of sensors (not shown) provided on conveyor31or the like and conveys load measuring device81to the work position. Conveyor31drives conveyor belts33to convey load measuring device81to the work position, then raises clampers36to position load measuring device81by sandwiching holding plates85and86between clampers36and stoppers35(S13).

Next, measurement target mounter11moves mounting head24based on control data received from production management computer19and captures an image of code section113of load measuring device81held at the work position. Mounter11detects code section113from the captured image (S15). Mounter11determines whether the detected code section113is identification information indicating load measuring device81(S17).

Mounter11, in a case in which the detected code section113is determined not to be identification information of load measuring device81(S17: no), displays an error on a display section or sounds an alarm to report an error to the user (S19), then ends processing ofFIG. 7. By this, a situation is prevented in which mounter11incorrectly performs load measurement on board CB. Also, the user is prompted to take necessary measures by the reporting of the error.

Conversely, in a case in which the detected code section113matches the identification information of load measuring device81(S17: yes), mounter11captures an image of the two fiducial marks111(S21). Mounter11, based on the positions of the fiducial marks detected from the image data, detects the accurate positional coordinates of the positioned load measuring device81. Mounter11performs correction of the coordinates to which mounting head24was moved in accordance with the positions of the detected fiducial marks111(S21). Thus, mounter11corrects the coordinate values in the X-axis direction and the Y-axis direction above load measuring device81, and mounting head24can be more accurately moved to the positions of switch section95A and pressure switch99A.

Next, mounter11moves mounting head24above pressure switch99A (S23). Mounter11lowers mounting head24to press pressure switch99A with suction nozzle70. Due to pressure switch99A being pressed, measurement start switch99outputs high level start recording signal S2to data logger97. Data logger97starts recording detection voltage V2for a specified time from that point (S23).

Next, mounter11moves mounting head24above switch section95A, and presses switch section95A using suction nozzle70(S25). Pressure sensor95outputs detection voltage V2to data logger97in accordance with the pressing force due to suction nozzle70.

Next, data logger97, after the specified time from when high level start recording signal S2was received from measurement start switch99has elapsed, stops recording detection voltage V2(S27). Accordingly, the recording time by data logger97is set in advance to an appropriate time in accordance with the operation of mounting head24and suction nozzle70, more specifically, in accordance with the operations of S21and S23above.

Next, measurement target mounter11conveys load measuring device81downstream (S29). Board work system10conveys the load measuring device81unloaded from measurement target mounter11downstream (towards reflow machine15) (S29). Then, the user removes the load measuring device81unloaded from component mounting line12. The user is able to read the load data of the desired mounter11by connecting the removed load measuring device81to external PC201.

Note that, in the above embodiment, upper surface83A is an example of a flat surface section. Holding sections85and86are examples of plate sections. Data logger97is an example of a storage section. Start measurement switch99is an example of a start command section. Pressure switch99A is an example of a command input section. Fiducial mark111is an example of a position detection mark. Code section113is an example of an identification mark. Detection voltage V2is an example of a load signal. S23is an example of a command issuing process and an acquisition starting process. S25is an example of a pressing load applying process.

The following effects are achieved by the above embodiments. Load measuring device81of an embodiment above is provided with load sensor95, data logger97, and start measurement switch99on body83. When switch section95A is pressed down by suction nozzle70, load sensor95outputs detection voltage V2to data logger97in accordance with the size of the pressing load. When pressure switch99A is pressed down by suction nozzle70, measurement start switch99outputs high level start recording signal S2to data logger97. Data logger97records detection voltage V2for a specified time only from the time it starts receiving high level start recording signal S2from measurement start switch99. Thus, data logger97does not record detection voltage V2until high level start recording signal S2is received from measurement start switch99. Accordingly, load measuring device81of the embodiment does not incorrectly measure vibrations and the like that occur during conveyance through component mounting line12as a pressing load. Also, load measuring device81starts measuring when pressure switch99A is pressed down by mounting head24. As a result, incorrect measurements are curtailed and it is possible to appropriately measure the pressing load.

Here, it may be considered to connect a load measuring device disclosed in the background art (JP-A-2009-188002) to a personal computer via a connection cord, and to issue an instruction to start measuring from the personal computer while monitoring operation at the mounters. However, in this case, the user must start load measurement by checking operation of the mounting devices and choosing the appropriate timing. Thus, the workload for load measurement is large.

In contrast, with load measuring device81of the embodiment, measurement start switch99is provided such that the timing of starting load measurement can be received externally. Measurement start switch99can be pressed by suction nozzle70. Therefore, for measurement, it is not necessary for the user to issue instructions to load measuring device81, so the workload is reduced.

Also, switch section95A of load sensor95and pressure switch99A of measurement start switch99of the embodiment are provided adjacent to each other on measurement plate83C of body83. Thus, the movement time of mounting head24during measurement of the pressing load is reduced.

Also, load measuring device81includes holding plates85and86with a thickness the same as thickness L1of board CB. Load measuring device81is fixed at the work position in a similar manner as board CB, by holding plates85and86being sandwiched by clampers36and the like. With such a configuration, it is possible to fix load measuring device81at a work position of mounter11the same as board CB, and it is possible to measure the pressing load in a state closer to an actual work state.

Further, the present disclosure is not limited to the above example embodiments, and various changed or improved methods of embodiment are possible based on the knowledge of someone skilled in the art. For example, in an embodiment above, measurement start switch99is used as a start command section, but the means of issuing the command to start measuring is not limited to this. For example, mounter11may instruct load measuring device81to start measuring the load wirelessly using infrared waves or the like. In this case, a wireless receiver provided in load measuring device81is an example of the start command section. Also, for example, mounter11may instruct load measuring device81to start measuring the load wirelessly using light emitted from mounting head24or the like. Alternatively, load measuring device81may be provided with measurement start switch99on holding plate85. In this case, mounter11can issue the instruction to start load measurement by start measurement switch99being pressed down while holding plate85is sandwiched by stopper35and clamper36. Also, load measuring device81, for example, may be provided with a timer, and be configured to start measuring based on the time it takes to be conveyed from the upstream side of component mounting line12to the measurement target mounter11. Also, for example, load measuring device81may be configured to start measuring when pressure switch99A is pressed once, and to stop measuring when pressure switch99A is pressed a second time.

Also, in an embodiment above, measuring the load is performed by conveying load measuring device81from the upstream side of component mounting line12, but the configuration is not limited to this. For example, a user may arrange load measuring device81by directly inserting it at the work position of mounter11. In this case, it is possible to curtail incorrect measurement of load measuring device81of such an embodiment by not incorrectly measuring vibration and the like that occurs when load measuring device81is conveyed by hand to the work position.

Further, in an embodiment above, measurement start switch99, for example, when pressure switch99A is pressed down to a specified reference position by suction nozzle70, outputs high level start recording signal S2to data logger97, but the timing of the output is not limited to this. For example, measurement start switch99may output high level start recording signal S2after a specified time has elapsed since the pressing by suction nozzle70. By this, it is possible to delay the timing of the recording to detection voltage V2by data logger97by the specified time.

Similarly, data logger97starts recording of detection voltage V2from when high level start recording signal S2is received from measurement start switch99, by the timing of starting measuring is not limited to this. For example, data logger97may record detection voltage V2from a time counting back by a specified time from the time when high level start recording signal S2started to be received as a reference. Alternatively, data logger97may start recording detection voltage V2after a specified time has elapsed from when high level start recording signal S2started to be received.

Also, load measuring device81may be provided with data logger97. For example, load measuring device81may be provided with a sending section that wirelessly sends detection voltage V2received from load sensor95. Load measuring device81may send detection voltage V2from the communication section to mounter11for a specified time only in accordance with receiving the high level start recording signal S2from measurement start switch99. With such a configuration too, it is possible to acquire a pressing load for a specified time from the point at which the start command was issued.

Also, in an embodiment above, mounting head24presses pressure switch99A using suction nozzle70, but the configuration is not limited to this. For example, mounting head24may press pressure switch99A using another member (such as a chuck) that holds a component. Also, the configuration of load measuring device81of an embodiment above is just one example and the configuration may be changed as appropriate. For example, fiducial marks111are not limited to a quantity of two; one fiducial mark, or three or greater marks may be provided. Also, for example, pressure switch99A and switch section95A may be provided separated from each other. Also, for example, power switch93and external interface101may be provided on upper surface83A.

REFERENCE SIGNS LIST