LED packaging dispensing device and dispensing method

Abstract

The present invention belongs to the field of LED packaging technology, and provides an LED packaging dispensing device and dispensing method. The dispensing device includes a device body, a revolving wheel assembly, a dispensing head, and a driving device. The revolving wheel assembly is connected to the device body, and the dispensing head is connected to the revolving wheel assembly. The revolving wheel assembly includes a plurality of revolving wheel components arranged from the inside out and rotating with each other. The dispensing head is arranged on the revolving wheel component in the innermost layer and rotates with it. The number of dispensing heads is two or more. The present application can adjust the needle distance and the direction of the needle connection line of the dispensing head by independently adjusting and rotating the revolving wheel assembly and the dispensing head. Accordingly, it can adapt to the simultaneous dispensing of two chips at different positions and distances in a multi-chip COB / module light source, doubling the production capacity and solving the compatibility problem of irregular chip position layout.

Description

Technical Field

[0001] The present invention belongs to the technical field of LED packaging, and in particular relates to an LED packaging glue dispensing device and a glue dispensing method. Background Art

[0002] The LED packaging dispensing process involves applying a mixture of phosphor and potting compound to the LED package. Current methods include dispensing, spraying, and pre-film lamination. Generally speaking, each method has its own advantages and disadvantages, meeting different scenarios and process requirements, and none of them can completely replace each other. Dispensing is the most widely used method.

[0003] The existing technologies for the dispensing method used in the LED packaging dispensing process are as follows:

[0004] The core equipment for the dispensing method is the dispensing machine, whose core component is the volumetric metering valve, supplemented by motion control components and image recognition components. As the representative structure of mainstream dispensing machines in the industry, the image recognition component and volumetric metering valve are installed on the Z-axis (vertical axis) of the motion control system.

[0005] The valve body is driven by a motor that drives a screw, which pushes a piston rod inside the valve cavity, squeezing the potting compound and phosphor mixture out of the needle and applying it to the appropriate position of the LED package. This device can only coat one LED per working cycle.

[0006] To improve efficiency, specialized metering valves known as "needle arrays" or "needle arrays" exist in the field. These are essentially the same as the volumetric metering valves mentioned above, differing primarily in that they integrate several valve bodies into a single, fixed array of needles. These devices can coat multiple LEDs simultaneously during each cycle, but because the needles are fixed, their number, spacing, and angle cannot be adjusted. Therefore, they must be customized for the arrangement of the LED package holder and are only compatible with holders with arrays of LED chips.

[0007] The two aforementioned methods are subject to significant speed and compatibility limitations in the chip-level dispensing process for irregularly distributed COB (Chips-On-Board) and LED module light sources. The single-needle method has extremely low production capacity, and array needles are not applicable. This significantly restricts production efficiency. Summary of the Invention

[0008] In order to overcome the above-mentioned shortcomings of the prior art, an object of the present invention is to provide an LED packaging glue dispensing device.

[0009] The technical solution adopted by the present invention to solve its technical problem is:

[0010] An LED packaging dispensing device, comprising:

[0011] A device body, a revolving wheel assembly, a dispensing head and a driving device, wherein the revolving wheel assembly is connected to the device body, and the dispensing head is connected to the revolving wheel assembly;

[0012] The revolving wheel assembly includes a plurality of revolving wheel members arranged from the inside out and rotating in cooperation with each other;

[0013] The dispensing head is provided on the innermost revolving wheel disc and rotates with it, and the number of the dispensing heads is more than two;

[0014] The device body has a flow channel portion for supplying glue to the glue dispensing head, and the glue dispensing head has a glue dispensing channel portion communicating with the flow channel portion;

[0015] The driving device is used to drive the rotation of the dispensing head and the rotation of the revolving wheel assembly respectively.

[0016] Preferably, the device body is provided with an inlet channel and a device cavity, the inlet channel is communicated with the device cavity and forms the flow channel portion, one end of the inlet channel is connected to the glue supply device, and the device cavity is used to place the revolving wheel assembly.

[0017] Preferably, the longitudinal cross-section of the device cavity is stepped and the transverse cross-section is circular, and includes a first cavity and a second cavity, the first cavity is connected to the inlet channel and the second cavity respectively, and the revolving wheel assembly is arranged in the second cavity;

[0018] The cross section of the revolving disc is a circular structure. The revolving disc is provided with a plurality of third cavities. The third cavities are used to place the dispensing head or the revolving disc in the inner layer.

[0019] Preferably, a first arc-shaped rack portion is provided along the inner wall surface of the second cavity, a second rack portion is provided along the outer wall surface of the revolving wheel disc, and a third rack portion is provided along the outer wall surface of the dispensing head;

[0020] The revolving wheel disc is provided with a first through slot for the first rack portion to pass through, and the first rack portion is meshed with the third rack portion;

[0021] The inner wall surface of the second cavity is provided with a second through-groove, and the second through-groove cooperates with the second rack portion of the outermost revolving wheel disc. The revolving wheel disc is provided with a third through-groove, and the third through-groove cooperates with the adjacent second rack portion.

[0022] A window is further provided on the device body. The position of the window corresponds to the position of the second rack portion and the third rack portion, and is used to expose the second rack portion and the third rack portion.

[0023] Preferably, a sealing ring is provided between the second cavity and the revolving disc, a sealing ring is provided between the third cavity and the revolving disc, and a sealing ring is provided between the third cavity and the dispensing head.

[0024] Preferably, the glue dispensing head is cylindrical, and a glue injection channel is provided in the glue dispensing head. The glue dispensing channel portion is the glue injection channel. The cross-section of the glue injection channel is funnel-shaped, including a glue injection inlet and a glue injection outlet. The size of the glue injection inlet is larger than the size of the glue injection outlet. The glue injection inlet is located at the center position of one end face of the glue dispensing head, and the glue injection outlet is located at a non-center position of the other end face of the glue dispensing head.

[0025] Preferably, one end surface of the dispensing head is provided with a mounting groove for placing the sealing ring, and the mounting groove is arranged around the glue injection inlet;

[0026] The top end surface of the revolving wheel disc is provided with a mounting groove for placing the sealing ring, and the mounting groove is arranged around the cavity opening of the third cavity.

[0027] Preferably, a conical protrusion is provided at the center of the top end surface of the revolving wheel disc.

[0028] The present invention also includes a dispensing method for an LED packaging dispensing device, which is applied to the above-mentioned LED packaging dispensing device, and the steps are as follows:

[0029] S1. The dispensing head rotates by the driving device, and the center distance between the dispensing needles of adjacent dispensing heads is set to d. The maximum and minimum values of the center distance are recorded: dmax and dmin;

[0030] S2. The revolving wheel assembly is rotated by the driving device, and the inclination angle of the connecting center line of the glue dispensing needles of adjacent glue dispensing heads on the revolving wheel assembly is set to θ;

[0031] S3. Scan all chip locations that require dispensing using an image recognition system, and group the chips in pairs based on the dmin / dmax parameters identified by the image recognition system, ensuring that the center-to-center distance dx of all chip groups is between dmin and dmax. Calculate the inclination angle θx of the center-to-center line of each chip group based on the x-axis of the image recognition system.

[0032] S4. The motion control system reads (dx, θx) of each chip group in turn, controls the rotation of the dispensing head to adjust the distance between the centers of the dispensing needles of adjacent dispensing heads to be equal to dx, and controls the revolution of the revolving wheel assembly to adjust the inclination angle of the center line of the dispensing needles of adjacent dispensing heads to be equal to θx, and then moves the device body with the adjusted distance between the centers of the dispensing needles and the inclination angle of the center line of the dispensing needles to the top of the corresponding group of chips through the xyz three axes to discharge glue, completing a working cycle.

[0033] Preferably, S5, after the motion control system completes dispensing of all grouped chips, if the total number of chips cannot be divided evenly by the number of dispensing needles of the dispensing head, the motion control system rotates the suspended dispensing needles of the dispensing head to a blank area without chips.

[0034] Compared with the prior art, the beneficial effects of the present invention include:

[0035] This application can adjust the needle distance and the direction of the needle connection line of the dispensing head through the independent adjustment and rotation of the revolving wheel assembly and the dispensing head. Accordingly, it can adapt to the simultaneous dispensing of two chips at different positions and distances in a multi-chip COB / module light source, doubling the production capacity and solving the compatibility of irregular chip position layout. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 FIG. 1 is a schematic diagram of a first embodiment of the present invention.

[0038] Figure 2 FIG. 1 is a schematic diagram of a device body according to a first embodiment of the present invention.

[0039] Figure 3 FIG. 1 is a schematic diagram of a revolving disc member according to a first embodiment of the present invention.

[0040] Figure 4 Schematic diagram of the center distance between the glue discharge needles of two dispensing heads according to the first embodiment of the present invention.

[0041] Figure 5 Schematic diagram of the cooperation between the first rack portion and the third rack portion according to the first embodiment of the present invention.

[0042] Figure 6 Schematic diagram of the inclination angle of the line connecting the dispensing needles of two dispensing heads according to the first embodiment of the present invention.

[0043] Figure 7 FIG. 1 is an application diagram of the first embodiment of the present invention.

[0044] Figure 8 FIG. 2 is a schematic diagram of an application of the second embodiment of the present invention.

[0045] Figure 9 FIG. 1 is a schematic diagram of a third embodiment of the present invention.

[0046] Figure 10 Schematic diagram of a primary orbiting disc member according to a third embodiment of the present invention.

[0047] Figure 11 FIG. 4 is an application diagram of the third embodiment of the present invention.

[0048] in:

[0049] 1-Device body, 2-Glue dispensing head, 3-Introduction channel, 4-First cavity, 5-Second cavity, 6-First rack part, 7-Second rack part, 8-Third rack part, 9-Revolving wheel disc, 10-First through groove; 11-Second through groove, 12-Third through groove, 13-Window, 14-Glue injection channel, 15-Glue injection inlet, 16-Glue injection outlet, 17-Ceramic sealing ring, 18-Mounting groove, 19-Protrusion, 20-First revolving wheel disc, 21-Second revolving wheel disc, 22-Third cavity. DETAILED DESCRIPTION

[0050] In order to be able to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. In the following description, many specific details are set forth in order to fully understand the present invention. The embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0052] Example:

[0053] like Figure 1-7 The first embodiment is a LED packaging dispensing device having a double dispensing head 2 structure. The specific structure is as follows, including:

[0054] The device body 1, the revolving wheel assembly, the dispensing head 2 and the driving device, the revolving wheel assembly is connected to the device body 1, and the dispensing head 2 is connected to the revolving wheel assembly. The revolving wheel assembly of the first embodiment is a revolving wheel member 9;

[0055] The device body 1 is provided with an inlet channel 3 and a device cavity. The longitudinal section of the device cavity is stepped and the transverse section is circular. It includes a first cavity 4 and a second cavity 5. The first cavity 4 is connected to the inlet channel 3 and the second cavity 5 respectively. The first cavity 4 and the inlet channel 3 form a flow channel portion, which is used to supply glue to the dispensing head 2.

[0056] The cross section of the revolving wheel disc 9 of this embodiment is a circular structure. The revolving wheel disc 9 has two third cavities. The third cavity 22 is used to place the dispensing head 2. A first arc-shaped rack portion 6 is provided along the inner wall surface of the second cavity 5, a second rack portion 7 is provided along the outer wall surface of the revolving wheel disc 9, and a third rack portion 8 is provided along the outer wall surface of the dispensing head 2. A first through groove 10 for the first rack portion 6 to pass through is provided on the revolving wheel disc 9. The first rack portion 6 is meshed with the third rack portion 8, and the second rack portion 8 is meshed with the third rack portion 8. A second through-slot 11 is provided on the inner wall of the cavity 5, which cooperates with the second rack portion 7 of the revolving wheel disc 9. A third through-slot 12 is provided on the revolving wheel disc, which cooperates with the adjacent second rack portion 7. A window 13 is also provided on the device body 1. The position of the window 13 corresponds to the positions of the third rack portion 8 and the second rack portion 7, and is used to expose the third rack portion 8 and the second rack portion 7. The arc length spanned by the window 13 is less than 1 / 2 of the circumference of the second cavity 5;

[0057] The dispensing head 2 of this embodiment is cylindrical and is provided with a glue injection channel 14. The cross section of the glue injection channel 14 is funnel-shaped and includes a glue injection inlet 15 and a glue injection outlet 16. The size of the glue injection inlet 15 is larger than that of the glue injection outlet 16. The glue injection inlet 15 is located at the center of the top end surface of the dispensing head 2, and the glue injection outlet 16 is located at a non-center position of the bottom end surface of the dispensing head 2.

[0058] A sealing ring is provided between the second cavity 5 and the revolving wheel disc member 9, a sealing ring is provided between the third cavity and the revolving wheel disc member 9, and a sealing ring is provided between the third cavity and the dispensing head 2. The sealing ring in this embodiment is a ceramic sealing ring 17. Specifically, the top end face of the dispensing head 2 is provided with a mounting groove 18 for placing the sealing ring, and the mounting groove 18 is arranged around the glue injection inlet 15. The top end face of the revolving wheel disc member 9 is provided with a mounting groove 18 for placing the sealing ring, and the mounting groove 18 is arranged around the cavity opening of the third cavity.

[0059] The driving device of this embodiment is used to drive the rotation of the dispensing head 2 and the rotation of the revolving wheel disc 9 respectively, which is specifically achieved through the third rack portion 8 and the second rack portion 7 at the action window 13.

[0060] In this embodiment, a conical protrusion 19 is provided at the center of the top end surface of the orbiting wheel disc 9 . The conical protrusion 19 forms a flow guide slope to facilitate the fluid to converge evenly toward the glue injection inlet 15 .

[0061] For the dispensing method of the first embodiment, the steps are as follows:

[0062] S1. The dispensing head 2 rotates self - rotationally through the driving device. Set the center distance between the dispensing needles of adjacent dispensing heads 2 as d, and record the maximum and minimum values of the center distance: dmax and dmin;

[0063] S2. The revolution turntable assembly rotates through the driving device. Set the inclination angle of the connecting line of the dispensing needles of adjacent dispensing heads 2 on the revolution turntable part 9 as θ;

[0064] S3. Scan the positions of all chips that need to be dispensed through the image recognition system, and group the chips in pairs according to the dmin / dmax parameters recognized by the image recognition system. Make the connecting distance dx of all chip groups be between dmin and dmax, and calculate the inclination angle θx of the connecting line of each group of chips based on the x - axis of the image recognition system;

[0065] S4. Read (dx, θx) of each group of chip groups in sequence through the motion control system. Control the self - rotation of the dispensing head 2 to adjust the connecting distance between the dispensing needles of adjacent dispensing heads 2 to be equal to dx, and control the revolution of the revolution turntable assembly to adjust the inclination angle of the connecting line of the dispensing needles of adjacent dispensing heads 2 to be equal to θx. Then move the device body 1 with the adjusted connecting distance between the dispensing needles and the inclination angle of the connecting line of the dispensing needles to the corresponding group of chips through the x - y - z three - axis, and perform glue dispensing to complete one working cycle.

[0066] S5. After the motion control system completes the dispensing of all grouped chips, if the total number of chips cannot be divided evenly by the number of dispensing needles of the dispensing head 2, then the motion control system rotates the dispensing needles of the suspended dispensing head 2 to the blank area without chips.

[0067] Through the adjustment of the above actions, under the condition of meeting the distance requirement of dmin < dx < dmax, the double - head dispensing device can adapt to the simultaneous dispensing of two chips at different positions, improve the dispensing productivity, and solve the compatibility problem of irregular distribution.

[0068] Such as Figure 8 , the second embodiment is an LED packaging dispensing device with a three - dispensing - head 2 structure. The difference from the first embodiment is that the revolution turntable part 9 has three third cavities, and at the same time, the three third cavities are arranged in an equilateral conical layout. The number of windows 13 is three, and they are arranged in a staggered manner in the height direction of the device body 1 and are staggered at an angle of 120° in the circumferential direction of the cross - section of the device body 1;

[0069] Using the dispensing method of the second embodiment, the image recognition system groups each three chips into a group and determines the center-to-center distances D1, D2, and D3 between each pair of chips. The system also uses the maximum side length of the three values as a reference, with the angle between the longest side and the x-axis as θ, to obtain the parameter group (D1x, D2x, D3x, θx).

[0070] Correspondingly, the motion control system adjusts D1, D2, and D3 by rotation, adjusts θ by revolution, and moves the device to a suitable height above the corresponding chipset through the xyz axes to spit glue and complete a working cycle.

[0071] In this way, each working cycle of all chip groups is completed one by one. If the total number of chips cannot be divided by the number of needles, the motion control system will rotate the suspended needles to a blank area without chips.

[0072] The dispensing device of the second embodiment has a production capacity three times that of a single head and can accommodate irregular chip positions.

[0073] like Figure 9-11 The third embodiment is a dispensing device for LED packaging, wherein the number of the revolving wheel disc components 9 in the revolving wheel disc assembly is three, and the structure is nested. Specifically, the revolving wheel disc component 9 in the outer layer is set as a first-level revolving wheel disc component 20, and the first-level revolving wheel disc component 20 has two third cavities. A second-level revolving wheel disc component 21 is provided in the third cavity of the first-level revolving wheel disc component 20, that is, in the inner layer, and the second-level revolving wheel disc component 21 has two third cavities. The third cavity of the second-level revolving wheel disc component 21 is provided with a dispensing head 2;

[0074] In this embodiment, the third rack portions 8 on a pair of dispensing heads 2 in each secondary revolving wheel component 21 are engaged with each other. When the dispensing head 2 on the relatively outer side is driven, the dispensing head 2 on the relatively inner side will be linked in the opposite direction, thereby achieving the purpose of adjusting the center distance of the dispensing needles of the dispensing head 2.

[0075] The dispensing method of the third embodiment is identical to that of the previous two embodiments. The distance, angle, and position of the eccentric needle are adjusted and matched based on parameters obtained through the image recognition system, ultimately completing the dispensing cycle for all grouped chips. If the total number of chips is not evenly divisible by the number of needles, the motion control system rotates the suspended needle to a blank area without chips. This embodiment can quadruple the efficiency of the dispensing process and is compatible with irregular chip positions, which will not be discussed further here.

[0076] To sum up, the present invention can adjust the needle distance and the direction of the needle connection line of the dispensing head 2 through the independent adjustment and rotation of the revolving wheel assembly and the dispensing head 2. Accordingly, it can adapt to the simultaneous dispensing of two chips at different positions and distances in a multi-chip COB / module light source, double the production capacity, and also solve the compatibility of irregular chip position layout.

[0077] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Therefore, any modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A dispensing method for an LED packaging dispensing device, characterized in that: The LED packaging dispensing device includes: The device body, the revolving wheel assembly, the dispensing head, the image recognition system, the motion control system and the driving device, the revolving wheel assembly is connected to the device body, and the dispensing head is connected to the revolving wheel assembly; The revolving wheel assembly includes a plurality of revolving wheel members arranged from the inside out and rotating in cooperation with each other; The dispensing head is provided on the innermost revolving wheel disc and rotates with it, and the number of the dispensing heads is more than two; The device body has a flow channel portion for supplying glue to the glue dispensing head, and the glue dispensing head has a glue dispensing channel portion communicating with the flow channel portion; The driving device is used to drive the rotation of the dispensing head and the rotation of the revolving wheel assembly respectively; The steps of the dispensing method are as follows: S1. The dispensing head rotates by the driving device, and the center distance between the dispensing needles of adjacent dispensing heads is set to d. The maximum and minimum values of the center distance are recorded: dmax and dmin; S2. The revolving wheel assembly is rotated by the driving device, and the inclination angle of the connecting center line of the glue dispensing needles of adjacent glue dispensing heads on the revolving wheel assembly is set to θ; S3. Scan all chip locations that require dispensing using an image recognition system, and group the chips in pairs based on the dmin / dmax parameters identified by the image recognition system, ensuring that the center-to-center distance dx of all chip groups is between dmin and dmax. Calculate the inclination angle θx of the center-to-center line of each chip group based on the x-axis of the image recognition system. S4. The motion control system reads (dx, θx) of each chip group in turn, controls the rotation of the dispensing head to adjust the distance between the centers of the dispensing needles of adjacent dispensing heads to be equal to dx, and controls the revolution of the revolving wheel assembly to adjust the inclination angle of the center line of the dispensing needles of adjacent dispensing heads to be equal to θx, and then moves the device body with the adjusted distance between the centers of the dispensing needles and the inclination angle of the center line of the dispensing needles to the top of the corresponding chip group through the xyz three axes to discharge glue, completing a working cycle.

2. The dispensing method of the LED packaging dispensing device according to claim 1, characterized in that: The device body is provided with an inlet channel and a device cavity. The inlet channel communicates with the device cavity and forms the flow channel portion. One end of the inlet channel is connected to the glue supply device. The device cavity is used to place the revolving wheel assembly.

3. The dispensing method of the LED packaging dispensing device according to claim 2, characterized in that: The device cavity has a stepped longitudinal section and a circular transverse section, and includes a first cavity and a second cavity. The first cavity is connected to the inlet channel and the second cavity respectively, and the orbiting wheel assembly is arranged in the second cavity. The cross section of the revolving disc is a circular structure. The revolving disc is provided with a plurality of third cavities. The third cavities are used to place the dispensing head or the revolving disc in the inner layer.

4. The dispensing method of the LED packaging dispensing device according to claim 3, characterized in that: A first arc-shaped rack portion is provided along the inner wall surface of the second cavity, a second rack portion is provided along the outer wall surface of the revolving wheel disc, and a third rack portion is provided along the outer wall surface of the dispensing head; The revolving wheel disc is provided with a first through slot for the first rack portion to pass through, and the first rack portion is meshed with the third rack portion; The inner wall surface of the second cavity is provided with a second through-groove, and the second through-groove cooperates with the second rack portion of the outermost revolving wheel disc. The revolving wheel disc is provided with a third through-groove, and the third through-groove cooperates with the adjacent second rack portion. A window is further provided on the device body. The position of the window corresponds to the position of the second rack portion and the third rack portion, and is used to expose the second rack portion and the third rack portion.

5. The dispensing method of the LED packaging dispensing device according to claim 4, characterized in that: A sealing ring is provided between the second cavity and the revolving disc, a sealing ring is provided between the third cavity and the revolving disc, and a sealing ring is provided between the third cavity and the dispensing head.

6. The dispensing method of the LED packaging dispensing device according to claim 5, characterized in that: The glue dispensing head is cylindrical, and a glue injection channel is provided in the glue dispensing head. The glue dispensing channel portion is the glue injection channel. The cross-section of the glue injection channel is funnel-shaped, including a glue injection inlet and a glue injection outlet. The size of the glue injection inlet is larger than the size of the glue injection outlet. The glue injection inlet is located at the center position of one end face of the glue dispensing head, and the glue injection outlet is located at a non-center position of the other end face of the glue dispensing head.

7. The dispensing method of the LED packaging dispensing device according to claim 6, characterized in that: An end surface of the dispensing head is provided with a mounting groove for placing the sealing ring, and the mounting groove is arranged around the glue injection inlet; The top end surface of the revolving wheel disc is provided with a mounting groove for placing the sealing ring, and the mounting groove is arranged around the cavity opening of the third cavity.

8. The method for dispensing glue for LED packaging according to claim 7, characterized in that: A conical convex portion is provided at the center of the top end surface of the revolving wheel disc.

9. The method for dispensing glue for LED packaging according to claim 1, characterized in that: S5. After the motion control system completes dispensing of all grouped chips, if the total number of chips cannot be divided by the number of dispensing needles of the dispensing head, the motion control system rotates the dispensing needles of the suspended dispensing head to a blank area without chips.

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