Packaging box appearance detection device

Abstract

The invention belongs to the technical field of detection equipment, and particularly relates to a packaging box appearance detection device which comprises a cabinet, a vertical frame and a conveying mechanism, one end of the conveying mechanism is provided with a film opening assembly, the top of the vertical frame is provided with a transfer mechanism, the output end of the transfer mechanism is provided with a suction assembly, and one side of the vertical frame is provided with a visual detection mechanism; the film opening assembly comprises a base and a hot cutter, the hot cutter is fixed to the upper surface of the base, the base is fixed between the two inner walls of the conveying mechanism, double-shaft air cylinders with upward output ends are fixed to the two sides of the lower surface of the base, and first vacuum adsorption bases are fixed to the output ends of the double-shaft air cylinders. When defects exist, the suction assembly fixes the film-coated packaging box, the first vacuum adsorption base adsorbs a film layer at the bottom of the film-coated packaging box, the double-shaft air cylinder drives the first vacuum adsorption base to move downwards, the film layer is made to be close to the blade point of the hot cutter, then the film layer is softened and cracked, then the film is taken down through the suction assembly, and rapid and lossless film tearing is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of detection equipment, and in particular is a packaging box appearance detection device. Background Art

[0002] In the product packaging industry, after all products are packed into the packaging box, the packaging box needs to be laminated to improve the durability and damage resistance of the packaging. The lamination process gives the packaging a variety of visual effects and touches through the selection of different film materials.

[0003] It is a crucial step to inspect the quality of finished packaging and deal with defects. Therefore, the finished packaging boxes need to be inspected for key indicators such as film defects (such as incomplete film, bubbles, wrinkles, edge lift, foreign matter inclusions, etc.), printing accuracy, and defective products need to be reworked by tearing off the film.

[0004] Currently, this process relies on manual operation, which has problems such as low detection efficiency and high missed detection rate. Manual film tearing relies on experience to judge the peeling angle and strength. If the force is too strong, it is easy to damage the packaging box and increase the rework cost. Summary of the invention

[0005] The object of the present invention is to provide a packaging box appearance inspection device, which can automatically perform multi-angle inspection on the packaging box after lamination, and automatically tear off the film of the finished product packaging with defects, so as to effectively improve the work efficiency and improve the product quality.

[0006] In order to solve the above-mentioned technical problems, the present invention provides a packaging box appearance inspection device, including a cabinet and a stand and a conveying mechanism both installed on the cabinet; a film opening component is installed at one end of the conveying mechanism, a transfer mechanism is installed on the top of the stand, a suction component facing the film opening component is fixed at the output end of the transfer mechanism, and a visual inspection mechanism facing the suction component is installed on one side of the stand; the film opening component includes a base and a hot cutting knife, the hot cutting knife is fixed at the middle of the upper surface of the base, the base is fixed between the two inner walls of the conveying mechanism, and both sides of the lower surface of the base are fixed with double-axis cylinders with output ends facing upwards, and a first vacuum adsorption seat is fixed at the output end of the double-axis cylinder, the adsorption plane of the first vacuum adsorption seat is lower than the conveying plane of the conveying mechanism, and the tip of the hot cutting knife is lower than the adsorption plane of the first vacuum adsorption seat.

[0007] Preferably, the suction assembly includes a chassis fixedly connected to the output end of the transfer mechanism, a third vacuum adsorption seat is fixed to the middle part of the lower surface of the chassis, guide rod cylinders with output ends facing downwards are fixed on both sides of the upper surface of the chassis, a bidirectional slide cylinder is fixed to the output end of the guide rod cylinder, a mounting seat is fixed to both output ends of the bidirectional slide cylinder, and a second vacuum adsorption seat is fixed to one side of the mounting seat.

[0008] Preferably, the chassis is fixedly connected to the third vacuum adsorption seat via a tension sensor.

[0009] Preferably, the conveying mechanism includes a second conveyor installed on the cabinet, the film opening assembly is installed at one end of the second conveyor, the first conveyor is mounted on the top of the other end of the second conveyor, and conveying mechanisms close to the first conveyor are installed on both sides of the top of the second conveyor, and the two groups of conveying mechanisms are arranged opposite to each other.

[0010] Preferably, the transport mechanism comprises a rotating cylinder fixed on the top of the second conveyor, a swing arm is fixed to the output end of the rotating cylinder, a pen-shaped cylinder is fixed to the end of the swing arm, and a rubber seat is fixed to the output end of the pen-shaped cylinder.

[0011] Preferably, the transfer mechanism includes a first electric cylinder slide horizontally installed on the top of the vertical frame, a second electric cylinder slide is vertically installed on the first slider of the first electric cylinder slide, a servo motor is installed on the second slider of the second electric cylinder slide, the motor shaft of the servo motor is connected to a fixed long rod through a coupling, and one end of the fixed long rod is fixedly connected to the suction assembly.

[0012] Preferably, a guide sleeve is provided on one side of the bottom of the second electric cylinder slide, and the fixed long rod passes through the guide sleeve.

[0013] Preferably, the visual inspection mechanism comprises a vertical pole installed on the cabinet, an industrial camera is installed on the vertical pole, and a strip light source adapted to the industrial camera is installed on one side of the vertical frame.

[0014] Preferably, a collection box is installed on one side of the stand.

[0015] After adopting the above technical solution, the beneficial effects of the present invention are: The visual inspection mechanism performs multi-angle inspection on the film-coated packaging box grasped by the suction component. When defects are found, the suction component first fixes the film-coated packaging box, and the first vacuum adsorption seat adsorbs the film layer at the bottom of the film-coated packaging box. The dual-axis cylinder drives the first vacuum adsorption seat to move downward, so that the film layer is close to the tip of the hot cutting knife, thereby softening and cracking the film layer, and then the suction component is used to remove the film, thereby achieving fast and damage-free film tearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of the conveying mechanism; Figure 3 It is a structural schematic diagram of the membrane opening component; Figure 4 It is a schematic diagram of the structure of the suction component; Figure 5 It is a structural schematic diagram of the transport mechanism; Figure 6 It is a schematic diagram of the structure of the transfer mechanism; Figure 7 It is a structural diagram of the visual inspection mechanism.

[0018] Figure markings: 1-stand, 2-visual inspection mechanism, 3-handling mechanism, 4-conveyor mechanism, 5-film opening assembly, 6-transfer mechanism, 7-suction assembly, 8-fixed long rod, 9-first conveyor, 10-second conveyor, 11-base, 12-guide rod, 13-spring, 14-dual-axis cylinder, 15-hot cutting knife, 16-first vacuum adsorption seat, 17-mounting seat, 18-bidirectional slide cylinder, 19-second vacuum adsorption seat, 20-third vacuum adsorption seat, 21-chassis, 22-guide rod cylinder, 23-rotating cylinder, 24-swing arm, 25-rubber seat, 26-pen-shaped cylinder, 27-first electric cylinder slide, 28-second electric cylinder slide, 29-second slider, 30-servo motor, 31-guide sleeve, 32-first slider, 33-stand, 34-industrial camera, 35-strip light source, 36-collection box. DETAILED DESCRIPTION

[0019] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention.

[0020] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the present invention. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0021] like Figure 1 and Figure 7 As shown, the packaging box appearance inspection device includes a cabinet (not shown) and a stand 1, a visual inspection mechanism 2, a conveying mechanism 4, a film opening component 5, a transfer mechanism 6 and a suction component 7 integrated thereon, forming a collaborative operation system for inspection, film tearing and rework. A collection box 36 is installed on one side of the stand 1 to collect the processed film. The side of the collection box 36 near the conveying mechanism 4 is high to prevent the film from falling to other locations, and the side of the far conveying mechanism 4 is low to facilitate manual collection and processing of the film.

[0022] like Figure 2 As shown, the second conveyor 10 is the main part of the conveying mechanism 4, which is responsible for inputting the film-coated packaging boxes to be inspected. The film opening component 5 is installed at one end of the second conveyor 10, and is used to open the film on the film-coated packaging boxes. The first conveyor 9 is set on the top of the other end of the second conveyor 10, and is used to receive the packaging boxes that have been film-opened and transport them to the next process or collection area. A set of transport mechanisms 3 is installed on both sides of the top of the second conveyor 10, and the two sets of transport mechanisms 3 are arranged opposite to each other and close to the end of the first conveyor 9.

[0023] like Figure 5 As shown, the transport mechanism 3 includes a rotary cylinder 23 and a swing arm 24. The rotary cylinder 23 is fixed on the top of the second conveyor 10, one end of the swing arm 24 is fixedly connected to the output end of the rotary cylinder 23, and swings with the rotation of the rotary cylinder 23, and the other end of the swing arm 24 is fixed with a pen-shaped cylinder 26. The output end of the pen-shaped cylinder 26 is fixed with a rubber seat 25 as a component that directly contacts the packaging box.

[0024] like Figure 3 As shown, the film opening assembly 5 includes a base 11 and a hot cutter 15. The base 11 is fixed between the two inner walls of the second conveyor 10, providing a stable installation base for the entire assembly. The hot cutter 15 is fixed to the middle of the upper surface of the base 11 and is consistent with the length direction of the packaging box. When opening the film, the hot cutter 15 is melted along the long axis (i.e., the length direction) of the packaging box, reducing damage to the packaging box caused by improper film opening, and also facilitating the next step of film tearing.

[0025] A double-axis cylinder 14 with an output end facing upward is fixed on both sides of the lower surface of the base 11, and a first vacuum adsorption seat 16 is fixed on the output end of the double-axis cylinder 14. A guide rod 12 passing through the base 11 is fixed on both sides of the lower surface of the first vacuum adsorption seat 16, and a spring 13 is sleeved on the guide rod 12 and abuts between the first vacuum adsorption seat 16 and the base 11.

[0026] The adsorption plane of the first vacuum adsorption seat 16 is 2 mm lower than the conveying plane of the conveying mechanism 4, ensuring that the film-coated packaging box can pass smoothly during the conveying process without being blocked by the first vacuum adsorption seat 16. The tip of the hot cutter 15 is 2 mm lower than the adsorption plane of the first vacuum adsorption seat 16, preventing the hot cutter 15 from contacting the film on the film-coated packaging box in advance.

[0027] like Figure 6 As shown, the transfer mechanism 6 is composed of an electric cylinder slide and a servo motor 30, providing precise position and angle control. The first electric cylinder slide 27 is horizontally mounted on the top of the stand 1, driving the first slider 32 thereon to move along the horizontal track. The second electric cylinder slide 28 is mounted on the first slider 32, driving the second slider 29 thereon to move along the track perpendicular to the first electric cylinder slide 27. Driven by the first electric cylinder slide 27, the second electric cylinder slide 28 travels back and forth between the film opening assembly 5 and the collection box 36, and puts the peeled film into the collection box 36.

[0028] The servo motor 30 is mounted on the second slide block 29. The motor shaft of the servo motor 30 is connected to the fixed long rod 8 through a coupling. One end of the fixed long rod 8 is fixedly connected to the suction assembly 7. The second electric cylinder slide 28 drives the servo motor 30 to complete the Z-axis lifting. The servo motor 30 drives the fixed long rod 8 to rotate through the coupling to achieve the posture adjustment of the film-coated packaging box, which is convenient for the multi-angle detection of the visual detection mechanism 2.

[0029] A guide sleeve 31 is provided on one side of the bottom of the second electric cylinder slide 28, and the fixed long rod 8 passes through the guide sleeve 31. The guide sleeve 31 provides guidance and support for the fixed long rod 8, ensuring that the fixed long rod 8 can move smoothly along a predetermined path to avoid deviation or shaking.

[0030] like Figure 4 As shown, the suction assembly 7 includes a chassis 21 fixedly connected to the fixed long rod 8. The suction assembly 7 is driven to rotate by the servo motor 30 to adjust the posture of the film-coated packaging box, so as to present the best detection angle to the visual inspection mechanism 2. A tension sensor is fixed in the middle of the lower surface of the chassis 21, and the end of the tension sensor is fixedly connected to the third vacuum adsorption seat 20, which can measure the weight of the film-coated packaging box and facilitate the rejection of defective products.

[0031] A guide rod cylinder 22 with an output end facing downward is fixed to both sides of the top of the chassis 21, and a two-way slide cylinder 18 is fixed to the output end of the guide rod cylinder 22. As the guide rod cylinder 22 is extended and retracted, the two-way slide cylinder 18 can move in the vertical direction to adapt to film packaging boxes of different heights.

[0032] The two output ends of the two-way slide cylinder 18 are fixed with a mounting seat 17, and a second vacuum adsorption seat 19 is fixed to one side of the mounting seat 17. With the expansion and contraction and movement of the two-way slide cylinder 18, the mounting seat 17 can move flexibly with the second vacuum adsorption seat 19 in the width direction of the packaging box, which is convenient for film tearing.

[0033] After the suction component 7 absorbs the film-coated packaging box, the second electric cylinder slide 28 is responsible for lifting it to a predetermined height, which is marked as the detection area, to ensure that the film-coated packaging box is located within the optimal pickup range of the visual detection mechanism 2.

[0034] like Figure 7 As shown, the visual inspection mechanism 2 includes a vertical pole 33 installed on the cabinet. Two groups of industrial cameras 34 are installed on the vertical pole 33 through a clamp universal seat to allow the industrial cameras 34 to be flexibly adjusted in angle and position. One of the industrial cameras 34 is tilted toward the top of the inspection area, so that the camera can capture details of the top and side (the side facing the visual inspection mechanism 2) of the coated packaging box (such as the integrity of the film, labels, printed patterns, etc.). The other industrial camera 34 is tilted toward the bottom of the inspection area, so that the camera can capture details of the bottom and side of the coated packaging box. The upper and lower oblique layout ensures that all key parts of the coated packaging box can be effectively detected, thereby improving the accuracy and reliability of the detection.

[0035] Two sets of bar light sources 35 adapted to the industrial camera 34 are installed on one side of the stand 1, one of which is slanted toward the top of the inspection area, and the other is slanted toward the bottom of the inspection area. The bar light sources 35 provide uniform and sufficient lighting, reduce the influence of shadows and reflections, highlight the detailed features of the film-coated packaging box, and enable the industrial camera 34 to capture high-quality images of the film-coated packaging box, which helps to improve the accuracy and reliability of image processing.

[0036] The film-coated packaging box first flows out of the laminating machine and is then fed into the second conveyor 10. The film-coated packaging box moves forward on the second conveyor 10 along a predetermined path. When the film-coated packaging box flows through the first sensor (located at the starting end of the second conveyor 10), the second conveyor 10 is inching (through a control button or program, the conveyor is temporarily run for a short distance or completes a short action). When the second sensor (installed on the second conveyor 10 and located on the side of the film opening component 5) detects the film-coated packaging box, the control system sends a stop command to the second conveyor 10. The control system automatically analyzes the lateral movement distance and the descending height of the suction component 7 based on the image captured by the visual inspection mechanism 2. The second electric cylinder slide 28 drives the servo motor 30 to descend to the set height, and the third vacuum adsorption seat 20 adsorbs the film-coated packaging box. Subsequently, the second electric cylinder slide 28 lifts the film-coated packaging box to the inspection area, and the double-station industrial camera 34 starts to take pictures. At the same time, the servo motor 30 is started, and the film-coated packaging box is driven to rotate through the fixed long rod 8 to ensure the complete detection of the appearance of the film-coated packaging box. The control system processes and analyzes the acquired image to determine whether the film-coated packaging box has appearance defects, such as incomplete film coating, wrong label, etc.

[0037] When the coated packaging box has information defects such as inkjet coding and labels, after the visual inspection mechanism 2 takes pictures, the second electric cylinder slide 28 descends, the third vacuum adsorption seat 20 releases the coated packaging box, and the second conveyor 10 starts to release the current coated packaging box. When the third sensor at the conveying mechanism 3 detects that the coated packaging box is flowing through, the pen-shaped cylinders 26 on both sides are started at the same time, and the output ends of both extend forward, pushing the rubber seat 25 to fit tightly and clamp the coated packaging box. After clamping the coated packaging box, the rotating cylinders 23 on both sides will start at the same time. The rotation of the rotating cylinder 23 will drive the swing arm 24 and the clamped coated packaging box to rotate together to the top of the first conveyor 9. Finally, the pen-shaped cylinder 26 retracts, releasing the coated packaging box, allowing it to fall smoothly onto the first conveyor 9, and the rotating cylinder 23 drives the swing arm 24 to reset.

[0038] When the film-coated packaging box has surface quality defects such as incomplete film coating and bulging, after taking pictures, the second electric cylinder slide 28 descends, the film-coated packaging box falls back to the second conveyor 10, and the third vacuum adsorption seat 20 remains in the suction state. The double-axis slide cylinder 18 shrinks, pulling the second vacuum adsorption seat 19 to fit tightly and clamp the film-coated packaging box. The double-axis cylinders 14 on both sides of the base 11 simultaneously push the first vacuum adsorption seat 16 up until its adsorption surface fits tightly with the bottom of the film-coated packaging box. The first vacuum adsorption seat 16 starts to adsorb the film layer at the bottom of the packaging box. The double-axis cylinder 14 pulls the first vacuum adsorption seat 16 down, and the adsorbed film layer begins to detach from the outer surface of the packaging box. As the first vacuum adsorption seat 16 descends, the dragged film layer contacts the tip of the hot cutter 15, causing the film layer to melt and crack. Subsequently, the first vacuum adsorption seat 16 and the double-axis cylinder 14 stop moving, and the double-axis slide cylinder 18 and the second vacuum adsorption seat 19 start. The bidirectional slide cylinder 18 pushes the second vacuum adsorption seat 19 on both sides to move outward. Under the suction of the second vacuum adsorption seat 19, the film layers on both sides of the film-coated packaging box are separated to both sides along the fused opening. Subsequently, the second electric cylinder slide 28 rises, and the servo motor 30 drives the base 11 to rotate 90 degrees to make it easier to remove the film layer. After the coated film layer is removed, the removed film layer is moved to the top of the collection box 36 as the first electric cylinder slide 27 drives. Finally, the third vacuum adsorption seat 20 stops sucking, and the removed film layer naturally falls into the collection box 36, completing the film tearing process. After the film tearing process, the second conveyor 10 is started, and the handling mechanism 3 sends the processed packaging box to the first conveyor 9.

[0039] When the third vacuum adsorption seat 20 absorbs the film-coated packaging box and lifts it, the tension sensor will be subjected to a tensile force, which includes the weight of the third vacuum adsorption seat 20 itself and the weight of the film-coated packaging box. By measuring and recording the weight of the third vacuum adsorption seat 20 in advance, and then subtracting this value from the reading of the tension sensor, the actual weight of the film-coated packaging box can be indirectly obtained. The measured weight is compared with the finished product weight range pre-entered in the control system to determine whether the film-coated packaging box has quality defects.

[0040] If the weight is within this range, the weight of the film-coated packaging box is considered qualified. If the weight is not within this range, it means that there are too many or too few items in the film-coated packaging box. For film-coated packaging boxes with more than one piece, and the visual inspection mechanism 2 does not find any defects in the appearance, film coating, etc. of the film-coated packaging box, no additional measures will be taken, and the film-coated packaging box will be released after the inspection. For film-coated packaging boxes with fewer pieces, the same treatment measures as those for appearance defects are taken, and the film is torn off and diverted.

[0041] According to the embodiments of the present invention as described above, these embodiments do not describe all the details in detail, nor do they limit the invention to specific embodiments. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can make good use of the present invention and the modified use based on the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A packaging box appearance inspection device, comprising a cabinet, a stand (1) and a conveying mechanism (4) both mounted on the cabinet; characterized in that: A film opening component (5) is installed at one end of the conveying mechanism (4), a transfer mechanism (6) is installed at the top of the stand (1), a suction component (7) facing the film opening component (5) is fixed at the output end of the transfer mechanism (6), and a visual inspection mechanism (2) facing the suction component (7) is installed on one side of the stand (1); the film opening component (5) comprises a base (11) and a hot cutter (15), the hot cutter (15) is fixed to the middle of the upper surface of the base (11), the base (11) is fixed between the two inner walls of the conveying mechanism (4), and a double-axis cylinder (14) with the output end facing upward is fixed on both sides of the lower surface of the base (11), and a first vacuum adsorption seat (16) is fixed at the output end of the double-axis cylinder (14), the adsorption plane of the first vacuum adsorption seat (16) is lower than the conveying plane of the conveying mechanism (4), and the tip of the hot cutter (15) is lower than the adsorption plane of the first vacuum adsorption seat (16).

2. The packaging box appearance detection device according to claim 1, characterized in that: The suction assembly (7) comprises a chassis (21) fixedly connected to the output end of the transfer mechanism (6); a third vacuum adsorption seat (20) is fixed to the middle of the lower surface of the chassis (21); guide rod cylinders (22) with output ends facing downward are fixed to both sides of the upper surface of the chassis (21); a bidirectional slide cylinder (18) is fixed to the output end of the guide rod cylinder (22); a mounting seat (17) is fixed to both output ends of the bidirectional slide cylinder (18); and a second vacuum adsorption seat (19) is fixed to one side of the mounting seat (17).

3. The packaging box appearance detection device according to claim 2, characterized in that: The chassis (21) is fixedly connected to the third vacuum adsorption seat (20) via a tension sensor.

4. The packaging box appearance detection device according to claim 1, characterized in that: The conveying mechanism (4) includes a second conveyor (10) installed in the cabinet, the film opening assembly (5) is installed at one end of the second conveyor (10), the first conveyor (9) is mounted on the top of the other end of the second conveyor (10), and the top of the second conveyor (10) is installed with a transport mechanism (3) close to the first conveyor (9), and the two groups of the transport mechanisms (3) are arranged opposite to each other.

5. The packaging box appearance detection device according to claim 4, characterized in that: The transport mechanism (3) comprises a rotary cylinder (23) fixed to the top of the second conveyor (10), a swing arm (24) being fixed to the output end of the rotary cylinder (23), a pen-shaped cylinder (26) being fixed to the end of the swing arm (24), and a rubber seat (25) being fixed to the output end of the pen-shaped cylinder (26).

6. The packaging box appearance detection device according to claim 1, characterized in that: The transfer mechanism (6) comprises a first electric cylinder slide (27) installed horizontally on the top of the stand (1); a second electric cylinder slide (28) is vertically installed on a first slider (32) of the first electric cylinder slide (27); a servo motor (30) is installed on a second slider (29) of the second electric cylinder slide (28); a motor shaft of the servo motor (30) is connected to a fixed long rod (8) via a coupling; one end of the fixed long rod (8) is fixedly connected to the suction assembly (7).

7. The packaging box appearance detection device according to claim 6, characterized in that: A guide sleeve (31) is provided on one side of the bottom of the second electric cylinder slide (28), and the fixed long rod (8) passes through the guide sleeve (31).

8. The packaging box appearance detection device according to claim 1, characterized in that: The visual inspection mechanism (2) comprises a vertical pole (33) mounted on a cabinet, an industrial camera (34) being mounted on the vertical pole (33), and a strip light source (35) adapted to the industrial camera (34) being mounted on one side of the vertical frame (1).

9. The packaging box appearance detection device according to claim 1, characterized in that: A collection box (36) is installed on one side of the stand (1).

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