JP2019125633A - Feeder maintenance device - Google Patents

Abstract

To provide a feeder maintenance device capable of preventing generation of wear powder due to a braking system of a load device and eliminating the cause of failure.SOLUTION: A feeder maintenance device having a function of measuring the stop position of a sprocket 4 by using a tape feeder that supplies a component to a component mounting apparatus by pitch-feeding a carrier tape by a sprocket 4 as a target includes a preload mechanism in which an engaging portion 7 engaged with the sprocket 4 is axially supported on a braking shaft 21 via a bearing mechanism using angular bearings 22 and 23, and a preload is given to the bearing mechanism by a nut member 25 screwed on a screw shaft portion 21e. As a result, it is possible to prevent the generation of wear powder generated in the prior art using a disc brake system.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a feeder maintenance device used for maintenance of a tape feeder used in a component mounting apparatus.

  DESCRIPTION OF RELATED ART The tape feeder is known as a components supply apparatus in the component mounting apparatus which mounts components on a board | substrate. In the tape feeder, components are supplied to the component removal position by the mounting head by pitch-feeding a carrier tape containing the components. In order to operate the tape feeder correctly, it is necessary to secure the stop position accuracy of the part at the part removal position within a predetermined range. For this reason, the tape feeder is a target of measurement of the stop position accuracy by the feeder maintenance device every predetermined maintenance interval (see, for example, Patent Document 1).

  In the prior art shown in this patent document example, the feeder maintenance apparatus provided with the load device 43 engaged with the sprocket 13 of the tape feeder of maintenance object, and driven to rotate with the sprocket 13 is disclosed. The load device 43 is provided with a brake mechanism 43a of an electromagnetic drive system, and the driven rotation of the load device 43 is braked by the brake mechanism 43a. By controlling the braking force, the load state when the tape feeder performs tape feeding is reproduced.

JP, 2014-220315, A

  However, the above-mentioned prior art has the following problems due to the braking system of the load device. That is, in the prior art, a disk brake is adopted as a brake mechanism, and a disk for braking is pressed against a brake pad by a predetermined braking force. For this reason, the brake surface of the disc always wears and wear powder is generated. Then, when the wear powder diffuses and intrudes into the inside of the tape feeder to be maintained, abnormal wear of the mechanism portion is promoted to cause a defect. As described above, in the feeder maintenance device of the prior art, wear powder is generated during operation due to the braking method of the load device, which causes a failure.

  Then, an object of this invention is to provide the feeder maintenance apparatus which can prevent generation | occurrence | production of the abrasion powder resulting from the damping | braking system of a load device, and can remove the cause of a malfunction.

  The feeder maintenance device of the present invention has a function of measuring the stop position of the sprocket for a tape feeder that supplies the component to the component mounting device by pitch-feeding a carrier tape containing the component by a sprocket. A maintenance device, comprising: a shaft; and an engaging portion axially supported on the shaft via a bearing mechanism using a rolling bearing and capable of engaging with the sprocket; and a preload mechanism for applying a preload to the bearing mechanism. Equipped.

  ADVANTAGE OF THE INVENTION According to this invention, generation | occurrence | production of the abrasion powder resulting from the damping | braking system of a load device can be prevented, and the cause of a malfunction can be removed.

Structure explanatory drawing of the feeder maintenance apparatus of one embodiment of this invention Explanatory drawing of the engagement state to the sprocket of the engaging part which comprises the brake mechanism of the feeder maintenance apparatus of one embodiment of this invention. Explanatory drawing of the stop position measurement in the feeder maintenance apparatus of one embodiment of this invention Structure explanatory drawing of the precompression mechanism provided in the brake mechanism of the feeder maintenance apparatus of one embodiment of this invention

  Next, embodiments of the present invention will be described with reference to the drawings. First, the configuration of the feeder maintenance device 1 will be described with reference to FIG. The feeder maintenance device 1 has a function of performing a predetermined maintenance operation on a tape feeder. The tape feeder is a component supply device that supplies components to a component mounting apparatus by pitch-feeding a carrier tape containing components with a sprocket.

  In the present embodiment, the stop position of the sprocket is measured as a predetermined maintenance operation. In the component feeding by the tape feeder, it is necessary to feed the component to the component take-out position by the component mounting mechanism and stop the component with high positional accuracy. For this reason, the measurement of the stop position for confirming the accuracy of the stop position of the sprocket which pitch-feeds a carrier tape in a tape feeder is performed at a predetermined interval.

  Next, in order to perform the measurement of the above-mentioned stop position, the function with which feeder maintenance device 1 was provided is explained with reference to each figure. In FIG. 1, the frame portion 2 in which each portion constituting the feeder maintenance device 1 is disposed is provided with a vertical frame 2b in a vertical posture at the end of the horizontal base plate 2a, and from the upper end of the vertical frame 2b to above the base plate 2a A horizontal bracket 2c is extended.

  The upper surface of the base plate 2a is a feeder mounting surface on which the tape feeder 3 to be subjected to the maintenance operation is mounted. By mounting the tape feeder 3 on the feeder mounting surface, the tape feeder 3 is mounted at a predetermined position on the base plate 2a. At the same time, the tape feeder 3 is electrically connected to the feeder maintenance device 1, whereby the supply of power to the tape feeder 3 and the exchange of control signals and measurement signals can be performed.

  At the tip of the main body 3 a of the tape feeder 3, a sprocket 4 is provided which engages with the carrier tape and feeds the pitch. The sprocket 4 is rotationally driven by the motor 5, and the driving current of the motor 5 at the time of maintenance work is measured by the ammeter 11. The current measurement result by the ammeter 11 is transmitted to the control unit 13.

  In the main body portion 3a, a tape cover member 3b covering the upper side of the sprocket 4 is provided rotatably (arrow a) around the pivot pin 3c. By rotating the tape cover member 3b upward, the sprocket 4 is in the state where the upper surface is opened. Thereby, access at the time of engaging the engaging part 7 of the brake mechanism 6 demonstrated below with the sprocket 4 becomes possible.

  The camera 2 is provided on the bracket 2c so as to be located immediately above the sprocket 4 with the imaging surface facing downward. By imaging the sprocket 4 from the upper surface by the camera 10, an image of the feed pin 4a provided on the outer periphery of the sprocket 4 is acquired. The imaging of the sprocket 4 is performed in a state where the tape cover member 3 b is rotated to open the upper surface of the sprocket 4. The image acquired by the camera 10 is sent to the recognition processing unit 12, and the image recognition result by the recognition processing unit 12 is sent to the control unit 13.

  A brake mechanism 6 (load device) is disposed to be held by the vertical frame 2 b obliquely above the sprocket 4 in a state where the tape feeder 3 is mounted. The brake mechanism 6 has a configuration (arrow b) for advancing and retracting the braking member 8 provided at the tip end with the engaging portion 7 engaged with the sprocket 4 with respect to the sprocket 4 by the advancing and retracting mechanism 9.

  In a state in which the advancing and retracting mechanism 9 is driven to advance the braking member 8, as shown in FIG. 2, a feed pin formed with an engaging claw 7 a formed on the outer periphery of the engaging portion 7 on the outer periphery of the sprocket 4. Engage 4a. Here, the engagement claws 7a have a shape and a pitch which are less likely to slip with the feed pin 4a when the sprocket 4 rotates in the tape feeding direction (arrow c). The brake mechanism 6 has a function of applying a braking force for braking the rotational drive of the sprocket 4 when the motor 5 is operated to rotationally drive the sprocket 4.

  At this time, by adjusting the braking force applied to the sprocket 4 by the brake mechanism 6, the driving load acting on the sprocket 4 in the actual tape feeding in the operating state of the tape feeder 3 can be artificially reproduced. In the feeder maintenance device 1 of the present embodiment, the adjustment of the braking force by the brake mechanism 6 is performed by adjusting the preload of the bearing mechanism that axially supports the engaging portion 7.

  The structure and function of the control part 13 with which the feeder maintenance apparatus 1 was equipped are demonstrated. The control unit 13 includes a measurement processing unit 14, a drive torque measurement unit 15, and a stop position detection unit 16, and further, a display unit 17 is attached to the control unit 13. The drive torque measurement unit 15 performs a process of measuring the drive torque of the sprocket 4 by the motor 5 based on the current measurement result by the ammeter 11.

  In the measurement of the stop position of the sprocket 4 described below, it is necessary to simulate the driving load acting on the sprocket 4 in the actual tape feeding. For this reason, the operator estimates the drive load acting on the sprocket 4 based on the value of the drive torque measured by the drive torque measurement unit 15. Then, the braking force is adjusted by the brake mechanism 6 so that the driving load becomes a desired reference value.

  The stop position detection unit 16 performs processing for detecting the stop position accuracy of the sprocket 4 based on the recognition result obtained by the recognition processing unit 12 performing recognition processing on the image of the sprocket 4 acquired by the camera 10. The stop position accuracy detection will be described with reference to FIG. First, as shown in FIG. 3A, the feed pin 4a is imaged by the camera 10 located above the sprocket 4. As shown in FIG.

  At this time, with the stop position on the control data of the feed pin 4a to be measured set at the reference point (for example, the origin of the optical coordinates) of the imaging screen of the camera 10, the tape feeder 3 is operated to operate the sprocket 4 To drive. Then, with the feed pin 4a stopped by this operation, the camera 10 captures an image of the sprocket 4 from above. Here, an example is shown in which the control data is set such that the stop position of the feed pin 4a coincides with the imaging optical axis 10a of the imaging screen by the camera 10.

  FIG. 3B shows an example in which the position of the feed pin 4 a is measured on the recognition screen 12 a by the recognition processing unit 12 based on the imaging screen obtained by imaging the feed pin 4 a by the camera 10 under such conditions. In general, the stop position of the feed pin 4a does not match the stop command position according to the design drive data, and the position varies depending on the individual feed pin 4a and the state of the drive mechanism system of the tape feeder 3 . For example, in the example illustrated in FIG. 3B, positional deviations of Δx and Δy occur in the optical coordinate system of the recognition screen 12a.

  When the degree of positional deviation detected exceeds the predetermined allowable range, it is determined that maintenance for improving the stop position accuracy is necessary, and a notification to that effect is issued. In the above configuration, the camera 10, the recognition processing unit 12, and the stop position detection unit 16 constitute a stop position measurement unit that measures the stop position of the sprocket 4 engaged with the engagement unit 7.

  The measurement processing unit 14 performs a process of causing the display unit 17 to display the measurement results of the driving torque measurement unit 15 and the stop position detection unit 16. Then, based on the measurement result displayed on the display unit 17, the worker performs necessary maintenance work. That is, based on the measurement result by the drive torque measurement unit 15, adjustment of the braking force of the brake mechanism 6 described below is performed. Further, based on the detection result by the stop position detection unit 16, the tape feeder 3 to be subjected to maintenance as a stop position defect is specified.

  As shown in FIG. 3, the brake mechanism 6 in the feeder maintenance device 1 shown in the present embodiment includes two engaging portions 7 provided in parallel at predetermined intervals. Thereby, two tape feeders 3 mounted in parallel to the base plate 2a can be simultaneously targeted for maintenance work. In this case, a relative movement mechanism for relatively moving and aligning the camera 10 and the sprocket 4 is required.

  In FIG. 3, a fitting shaft portion 21 a of a braking shaft 21 (shaft) is fitted and fixed in a fitting hole 8 a provided at the tip end portion of the braking member 8. On one side (left side in FIG. 3) of the fitting shaft portion 21a, a shaft support portion 21d whose outer diameter is reduced via a stepped portion 21b extends. A rotating cylindrical portion 20, in which the engaging portion 7 is integrally provided at an inner end portion, is pivotally supported by the pivotal support portion 21d.

  On the other side (right side in FIG. 3) of the fitting shaft 21a, the same shaft support 21d as described above is extended via the flange 21c, and in the shaft support 21d, the engaging portion at the inner end A rotating cylindrical portion 20 in which 7 is integrally provided is pivotally supported. The engaging portion 7 is provided with an engaging claw 7 a shown in FIG. 2, and the engaging claw 7 a engages with the feed pin 4 a of the sprocket 4.

  In the rotating cylindrical portion 20, a casing portion 20a which accommodates a pair of angular bearings 22 and 23 which are rolling bearings extends out of the engaging portion 7. Here, a bearing mechanism is formed to accommodate the pair of angular bearings 22 and 23 of the front combination in which the washer 24 is sandwiched between the outer ring portions and opposed to each other in the casing portion 20a to pivotally support the rotating cylindrical portion 20. . That is, in the present embodiment, the engaging portion 7 engageable with the sprocket 4 is pivotally supported by the braking shaft 21 via the bearing mechanism having the above-described configuration.

  An externally threaded portion 21f is provided on the outer periphery of a screw shaft portion 21e in which the shaft support portion 21d extends to the outside of the casing portion 20a. A nut member 25 which is an internally threaded member having an internally threaded portion 25a on the inner periphery is screwed to the screw shaft portion 21e. An annular collar member 26 intervenes between the nut member 25 and the inner ring portion 22 a of the angular bearing 22.

  By rotating the nut member 25 in the tightening direction, the nut member 25 applies a pressing force F to press the inner ring portion 22 a of the angular bearing 22 inward through the collar member 26. Since the inner ring portion 23a of the angular bearing 23 is pressed against the stepped portion 21b and fixed in position, the pressing force F causes the angular bearings 22 and 23 to be subjected to a pre-tension for tightening the mutual.

  Therefore, by adjusting the pressing force F by the nut member 25, it is possible to adjust the preload that presses the angular bearings 22, 23 in the axial direction. The adjustment of the pressing force F is performed by measuring and managing the torque when tightening the nut member 25 with a torque gauge or the like. Here, since the angular bearings 22 and 23 excellent in the load capacity in the axial direction are arranged and used in a front combination, a bearing excellent in durability and operation stability even when a large preload is applied. It is possible to realize the function.

  In the above configuration, the external screw portion 21f provided on the outer periphery of the screw shaft portion 21e and the nut member 25 provided with the internal screw portion 25a screwed to the external screw portion 21f apply a preload to the aforementioned bearing mechanism. It constitutes a preload mechanism. Also in the engaging portion 7 shown on the right side in FIG. 4, a bearing mechanism configured to pivotally support the rotating cylindrical portion 20 inside the rotating cylindrical portion 20 via the pair of front combinations of angular bearings 22 and 23 is provided. It is built-in. And it is the structure provided with the same precompression mechanism.

  By adjusting the preload in this manner, it is possible to adjust the magnitude of the braking torque Tb for braking the drive torque Td in the tape feeding direction to the drive shaft 4AX of the drive mechanism that rotationally drives the sprocket 4. Thereby, in the measurement of the stop position of the sprocket 4, the driving load acting on the sprocket 4 in the actual tape feeding can be artificially reproduced.

  In the present embodiment, the feeder maintenance device 1 is pivotally supported by the brake shaft 21 via the bearing mechanism using the angular bearings 22 and 23 and the engaging portion 7 engaged with the sprocket 4 is used as the bearing mechanism in the bearing mechanism. It is set as the structure provided with the precompression mechanism which gives a precompression. This makes it possible to solve the problems in the prior art in which the brake disc coupled to the braking shaft is sandwiched by the pads.

  That is, in the prior art, the brake disk to which the brake pad is pressed by a predetermined braking force is always worn and dust is generated. Then, when the wear powder diffuses and intrudes into the inside of the tape feeder to be maintained, abnormal wear of the mechanism portion is promoted to cause a defect. On the other hand, in the present embodiment of the above-described configuration, there is no generation of such wear powder. Therefore, generation | occurrence | production of the abrasion powder resulting from the damping | braking system of a load device can be prevented, and the cause of a malfunction can be removed.

  The feeder maintenance device of the present invention has an effect that generation of wear powder caused by the braking system of the load can be prevented and the cause of the failure can be removed, and the parts supply which supplies parts using the tape feeder It is useful in the field.

Reference Signs List 1 feeder maintenance device 3 tape feeder 4 sprocket 4a feed pin 6 brake mechanism 7 engagement portion 7a engagement claw 10 camera 20 rotation cylindrical portion 21 braking shaft 21 e screw shaft portion 21 f outer thread portion 22 23 angular bearing 25 nut member

Claims (5)

A feeder maintenance device having a function of measuring the stop position of the sprocket for a tape feeder that supplies the component to the component mounting apparatus by pitch-feeding a carrier tape containing the component by a sprocket.
Axis,
An engagement portion axially supported by the shaft via a bearing mechanism using a rolling bearing and engageable with the sprocket;
A feeder maintenance device comprising: a preloading mechanism for applying a preload to the bearing mechanism.   The feeder maintenance device according to claim 1, further comprising a stop position measurement unit that measures a stop position of the sprocket engaged with the engagement portion.   The feeder maintenance device according to claim 1, wherein the rolling bearing is an angular bearing.   The feeder maintenance device according to claim 3, wherein the bearing mechanism is a pair of angular bearings in front combination.   The feeder maintenance device according to any one of claims 1 to 4, wherein the preloading mechanism is an externally threaded portion provided on an outer periphery of the shaft and an internally threaded member screwed to the externally threaded portion.

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