An electronic quantitative packaging scale and high-precision weighing method thereof

Abstract

The present invention relates to an electronic quantitative packaging scale and a high-precision weighing method thereof, belonging to the field of packaging technology. The scale comprises a frame and a feeding weighing platform installed on the top surface of the frame, a weighing mechanism is installed on the surface of the weighing platform, the weighing mechanism comprises weighing sensors symmetrically arranged on both sides of the top of the weighing mechanism, and a weighing bin assembly is hoisted and connected in the inner cavity of the weighing mechanism; a feeding mechanism is connected to the top of the weighing mechanism, a feeding hopper is connected to the bottom of the weighing mechanism, the bottom of the feeding hopper is connected to a bag clamping mechanism, a lifting cylinder is fixedly installed on the middle part of the bag clamping frame and the crossbeam, a lifting slide block is connected to the top of the lifting cylinder, a square bag clamping horizontal mounting frame is horizontally arranged on the front surface of the lifting slide block, a conveying mechanism is also arranged directly below the bag clamping mechanism, a control box is also arranged on the side of the conveying mechanism, and the control box is electrically connected to the feeding mechanism for automatically calculating and controlling the weight of the unloading material.

Description

Technical Field

[0001] The invention relates to an electronic quantitative packaging scale and a high-precision weighing method thereof, belonging to the technical field of packaging. Background Art

[0002] An electronic quantitative packaging scale is a device that uses an electronic weighing sensor for quantitative weighing and packaging. M represents the target value of packaging. Existing electronic quantitative packaging scales all use M as the target value to set the metering mechanism. The feeding mechanism controls the material entering the weighing hopper. The metering mechanism controls the feeding mechanism through feedback to perform coarse and fine feeding. When the target value is reached, the feeding mechanism is closed to stop feeding, and then the material in the weighing hopper is placed in the packaging bag. Due to the limitations of the existing weighing sensors and weighing instrument technology, the current maximum division number of electronic scales is generally 3000~6000. In addition to feeding and other system errors, the highest packaging accuracy of electronic packaging scales is generally ±1 / 1000M. Although this packaging accuracy can meet the requirements of national standards, for the packaging of some precious materials, we still hope to have higher precision quantitative packaging to avoid user losses.

[0003] In view of the above-mentioned defects, the designers have actively carried out research and innovation in order to create an electronic quantitative packaging scale and its high-precision weighing method to make it more valuable for industrial use. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide an electronic quantitative packaging scale, comprising a frame and a material adding and weighing platform installed on the top surface of the frame.

[0005] A weighing mechanism is installed on the surface of the weighing platform, and the weighing mechanism includes a weighing sensor fixedly connected to the weighing mechanism, and a weighing bin assembly is hoisted and connected in the inner cavity of the weighing mechanism;

[0006] The top of the weighing mechanism is connected with a feeding mechanism;

[0007] A feeding hopper is connected to the bottom of the weighing mechanism, and the bottom of the feeding hopper is connected to the bag clamping mechanism. A conveying mechanism is also provided directly below the bag clamping mechanism, and a control box is also provided on the side of the conveying mechanism. The control box is electrically connected to the feeding mechanism for automatically calculating and controlling the feeding weight.

[0008] A high-precision weighing method for an electronic quantitative packaging scale, the specific weighing steps are:

[0009] (1) Through the control box setting and calculation, the target weight M of the material to be packaged is divided into n equal parts, that is, the measured weight of a single part is M / n;

[0010] (2) Use an electronic fixed wheel packaging scale to weigh n-1 times according to the measured weight of M / n, and put the material weighed each time into the packaging bag;

[0011] (3) The control box automatically records the cumulative weight of the previous n-1 materials M / n×(n-1);

[0012] (4) The control box automatically calculates the difference between the target weight M and the cumulative weight of the previous n-1 materials M / n×(n-1), that is, M - M / n×(n-1);

[0013] (5) The above difference M-M / n×(n-1) is taken as the adjustment error value of the nth scale;

[0014] (6) Adjust the last weighing, i.e. the measured weight of the nth weighing, to M / n±[M- M / n×(n-1)];

[0015] (7) The material weighed in the nth weighing and the material weighed cumulatively in the previous n-1 times can be combined to complete the high-precision weighing of the material by the electronic quantitative packaging scale.

[0016] Furthermore, the feeding mechanism includes a feed port at the top, a buffer bin is obliquely arranged at the bottom of the feed port, a rectangular plug plate is plugged and installed on the top side wall of the buffer bin, a vertically arranged feed port is connected to the bottom of the buffer bin, and a feed quantity adjustment mechanism is also provided in the feed port cavity.

[0017] Furthermore, a square weighing feed port is provided at the center position of the top of the weighing mechanism, the weighing bin assembly and the weighing sensor are connected by hoisting, the weighing bin assembly includes a weighing bin, a horizontal suspension rod is provided running through the top of the weighing bin on the left and right sides, both ends of the horizontal suspension rod are hoisted on the weighing sensor by ropes, an opening and closing installation frame is also connected to the bottom of the weighing bin, two rotating shafts are symmetrically provided at the bottom of the left and right sides of the opening and closing frame, and opening and closing claws are rotatably sleeved on the surface of the rotating shafts, and the opening and closing claws are one on each side and symmetrically arranged, and the top ends of the two opening and closing claws on the left and right are respectively hinged to the two ends of the opening and closing cylinder.

[0018] Furthermore, the bag clamping mechanism includes a bag clamping frame arranged below the frame, a lifting cylinder is fixedly installed in the middle of the bag clamping frame and on the cross beam, a lifting slider is connected to the top of the lifting cylinder, a bag clamping horizontal mounting frame is horizontally arranged on the front surface of the lifting slider, four lifting clamps are extended outward at the four corners of the bag clamping horizontal mounting frame, two inclined bag clamping cylinders are also arranged at the bottom of the bag clamping horizontal mounting frame, and a horizontally arranged bag clamping ring is also connected to the output end of each bag clamping cylinder.

[0019] Furthermore, the material discharge amount adjustment mechanism includes a transmission cylinder fixedly mounted on the outer side of the side wall of the material discharge bin, a transmission block is hingedly connected to the output end of the transmission cylinder, the lower end of the transmission block is movably fixed on the side wall of the material discharge bin, and the bottom end of the transmission block is fixedly connected to an adjustment frame shaft.

[0020] Furthermore, the adjusting frame shaft and the transmission block are perpendicular to each other, and pass through the left and right side walls of the material discharge bin, and are also perpendicular to the left and right side walls of the material discharge bin. A material discharge amount adjusting frame is fixedly connected to the bottom of the adjusting frame shaft, and the bottom of the material discharge amount adjusting frame is an arc surface structure, and an arc-shaped opening is provided on the edge of the left side frame of the material discharge amount adjusting frame.

[0021] Furthermore, the slide rails on both sides of the lifting slider and the bag clamping frame are matched and slidably connected.

[0022] Furthermore, the hoisting clamping member is also provided with a hoisting clamping cylinder.

[0023] Furthermore, the conveying mechanism includes a conveying frame installed directly below the horizontal bag clamping mounting frame, a conveyor belt is provided on the surface of the conveying frame, and a conveying motor is also installed on the side of the conveying frame. The conveying motor and the conveyor belt are connected by transmission and are used to transport the packaging bags packaged by the bag clamping to the next workstation.

[0024] By means of the above scheme, the present invention has at least the following advantages:

[0025] The electronic quantitative packaging scale and its high-precision weighing method of the present invention adopt a new packaging scale weighing method under the level of the current maximum division number of 3000-6000 of the electronic scale, and invent a new packaging scale to achieve a packaging accuracy higher than ±1 / 1000M, which greatly improves the packaging weighing accuracy of materials and has broad application prospects.

[0026] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show a certain embodiment of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 This is a diagram of the assembly of the high-precision electronic quantitative packaging scale of the present invention;

[0029] Figure 2 It is an assembly diagram of a feeding mechanism, a weighing mechanism and a feeding hopper in a high-precision electronic quantitative packaging scale of the present invention;

[0030] Figure 3 It is a complete diagram of the weighing mechanism in the high-precision electronic quantitative packaging scale of the present invention;

[0031] Figure 4 This is a diagram of the overall assembly of the weighing bin in the high-precision electronic quantitative packaging scale of the present invention;

[0032] Figure 5 It is a perspective view of the weighing mechanism in the high-precision electronic quantitative packaging scale of the present invention;

[0033] Figure 6 A three-dimensional diagram of the opening and closing claws in the high-precision electronic quantitative packaging scale of the present invention;

[0034] Figure 7 It is a stereoscopic diagram of the feeding mechanism in the high-precision electronic quantitative packaging scale of the present invention;

[0035] Figure 8 It is a three-dimensional diagram of the material discharge amount adjustment mechanism in the high-precision electronic quantitative packaging scale of the present invention;

[0036] Fig. 9 It is a structural side view of the bag clamping mechanism in the high-precision electronic quantitative packaging scale of the present invention;

[0037] Fig.10 It is a structural schematic diagram of the transmission mechanism in the high-precision electronic quantitative packaging scale of the present invention;

[0038] Among them, in the figure,

[0039] 1. Frame; 2. Weighing platform; 3. Feeding mechanism; 4. Weighing mechanism; 5. Feeding hopper; 6. Bag clamping mechanism; 7. Control box; 8. Conveying mechanism;

[0040] 31. Feeding port; 32. Buffer bin; 33. Insert plate; 34. Feeding bin; 35. Feeding amount adjustment mechanism;

[0041] 351, feeding amount adjustment frame; 352, adjustment frame rotating shaft; 353, transmission block; 354, transmission cylinder;

[0042] 41. Weighing sensor; 42. Weighing feed port; 43. Weighing bin assembly;

[0043] 431, weighing bin; 432, horizontal suspension rod; 433, opening and closing mounting frame; 434, rotating shaft; 435, opening and closing claw; 436, opening and closing cylinder;

[0044] 61. Bag clamping rack; 62. Lifting cylinder; 63. Lifting slide block; 64. Bag clamping horizontal mounting frame; 65. Lifting clamping piece; 66. Lifting clamping cylinder; 67. Bag clamping cylinder; 68. Bag clamping ring; 69. Packaging bag;

[0045] 81. Conveyor frame; 82. Conveyor belt; 83. Conveyor motor. DETAILED DESCRIPTION

[0046] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0047] See also Figure 1 , Figure 2 A high-precision weighing device for an electronic quantitative packaging scale according to a preferred embodiment of the present invention comprises a frame 1 and a material feeding weighing platform 2 installed on the top surface of the frame 1, characterized in that:

[0048] See also Figure 1 , Figures 3 to 6 A weighing mechanism 4 is installed on the surface of the weighing platform 2. The weighing mechanism 4 includes weighing sensors 41 symmetrically arranged on both sides of the top of the weighing mechanism 4, and the model is DEE-100kg. A square weighing feed port 42 is provided at the center of the top of the weighing mechanism 4. A weighing bin assembly 43 connected to the weighing sensor 41 by hoisting is also provided in the inner cavity of the weighing mechanism 4. The weighing bin assembly 43 includes a weighing bin 431. A horizontal suspension rod 432 is provided on the top of the weighing bin 431. Both ends of the horizontal suspension rod 432 are hoisted on the weighing sensor 41 by ropes. An opening and closing installation frame 433 is also connected to the bottom of the weighing bin 431. Two rotating shafts 434 are symmetrically provided at the bottom on both sides of the opening and closing frame 433. An opening and closing sleeve is rotatably provided on the surface of the rotating shaft 434. The closing claws 435 are symmetrically arranged, one on each side of the opening and closing claws 435. When the opening and closing claws 435 are closed, they can just match the shape of the bottom of the weighing bin 431, so that the bottom of the entire weighing bin 431 is closed to prevent materials from leaking. The top ends of the left and right opening and closing claws 435 are respectively hinged to the two ends of the opening and closing cylinder 436. When the opening and closing cylinder 436 extends outward, it will push the top ends of the left and right opening and closing claws 435 to move outward. At this time, the opening and closing claws 435 will rotate with the rotating shaft 434 as the fulcrum, prompting the bottom of the opening and closing claws 435 to close inward. On the contrary, if the opening and closing cylinder 436 contracts inward, it will pull the top ends of the left and right opening and closing claws 435 to move inward. At this time, the opening and closing claws 435 will rotate with the rotating shaft 434 as the fulcrum, prompting the bottom of the opening and closing claws 435 to open outward, thus completing the opening and closing of the bottom of the weighing mechanism 4.

[0049] See also Figures 7 and 8The top of the weighing mechanism 4 is connected to a feeding mechanism 3, and the feeding mechanism 3 includes a square feeding port 31 arranged horizontally at the top, and a buffer bin 32 is arranged obliquely at the bottom of the feeding port 31. A rectangular plug-in plate 33 is installed on the top side wall of the buffer bin 32. The feeding speed of the dosing device can be controlled by controlling the depth of the plug-in plate 33 inserted into the buffer bin 32. The deeper the plug-in plate 33 is inserted, the slower the feeding speed. The bottom of the buffer bin 32 is connected to a vertical feeding bin 34, and a feeding amount is also arranged in the cavity of the feeding bin 34. The adjusting mechanism 35 includes a transmission cylinder 354 fixedly mounted on the outer side of the side wall of the lower material bin 34, and a transmission block 353 is hingedly connected to the output end of the transmission cylinder 354. The lower end of the transmission block 353 is movably fixed on the side wall of the lower material bin 34, and the bottom end of the transmission block 353 is fixedly connected to an adjusting frame shaft 352. The adjusting frame shaft 352 and the transmission block 353 are perpendicular to each other, and pass through the left and right side walls of the lower material bin 34, and are also perpendicular to each other between the left and right side walls of the lower material bin 34. The bottom of the adjustment frame shaft 352 is fixedly connected to the feed amount adjustment frame 351. The bottom of the feed amount adjustment frame 351 is an arc surface structure. An arc-shaped opening 355 is provided on the edge of the left side frame of the feed amount adjustment frame 351. When the transmission cylinder 354 extends outward, it pushes the top of the transmission block 353 forward, thereby using the lower end of the transmission block 353 as a fulcrum to drive the adjustment frame shaft 352 to move counterclockwise, thereby driving the feed amount adjustment frame 351 to move counterclockwise as well, so that the right side frame of the feed amount adjustment frame 351 moves up and overlaps with the top of the feed bin 34. At this time, the left side frame of the material discharge amount adjustment frame 351 has no obstruction to the material, which is equivalent to the material falling vertically. At this time, the material discharge amount is the largest. When the transmission cylinder 354 retracts, the transmission block 353 will drive the adjustment frame shaft 352 and the material discharge amount adjustment frame 351 to move clockwise until the left side frame of the material discharge amount adjustment frame 351 and the forearm of the material discharge bin coincide with each other. At this time, the material can only leak out through the arc-shaped opening 355 on the left side frame of the material discharge amount adjustment frame 351, thereby ensuring the minimum material discharge amount. Therefore, during the contraction of the transmission cylinder 354, the material discharge amount can be reduced.

[0050] See also Fig. 9The bottom of the weighing mechanism 4 is connected to a feeding hopper 5, and the bottom of the feeding hopper 5 is connected to a bag clamping mechanism 6. The bag clamping mechanism 6 includes a vertically arranged rectangular bag clamping frame 61 arranged below the frame 1. A lifting cylinder 62 is fixedly installed on the middle part and the crossbeam of the bag clamping frame 61. A lifting slider 63 is connected to the top of the lifting cylinder 62. The two sides of the lifting slider 63 match and are slidably connected to the slide rails on both sides of the bag clamping frame 61. A square bag clamping horizontal mounting frame 64 is horizontally arranged on the front surface of the lifting slider 63. Four lifting clamps 65 are extended outward at the four corners of the bag clamping horizontal mounting frame 64. The hoisting clamping member 65 is also provided with a hoisting clamping cylinder 66. The bottom of the bag clamping horizontal mounting frame 64 is also symmetrically provided with two inclined bag clamping cylinders 67. The output end of each bag clamping cylinder 67 is also connected to a horizontally arranged bag clamping ring 68. The bag clamping ring 68 is semicircular. The two bag clamping rings 68 are closed to form a complete circular structure, so as to clamp and fix the packaging bag 69. The hoisting clamping member 65 hoists the packaging bag 69 on the bag clamping horizontal mounting frame 64 through a rope, and hoists the packaging bag 69 off the ground for loading through the lifting cylinder 62. The hoisting installation off the ground can prevent the packaging bag 69 from being insufficiently filled due to wrinkles and stacking.

[0051] See also Fig.10 A conveying mechanism 8 is also provided directly below the bag clamping mechanism 6. The conveying mechanism 8 includes a conveying frame 81 installed directly below the bag clamping horizontal mounting frame 64. A conveying belt 82 is provided on the surface of the conveying frame 81. A conveying motor 83 is also installed on the side of the conveying frame 81. The conveying motor 83 and the conveying belt 82 are connected by transmission, and are used to transport the packaging bags 69 packaged by the bag clamping to the next workstation.

[0052] A control box 7 is also provided on the side of the conveying mechanism 8. The control box 7 is electrically connected to the feeding mechanism 3 for automatically calculating and controlling the weighing weight of the unloaded materials.

[0053] When the present invention is actually used, the target value of quantitative packaging is 1000kg. When the existing packaging scale is used for packaging, 1000kg is measured at a time, and the highest accuracy we can achieve is ±1 / 1000*1000kg, that is, ±1kg.

[0054] When using the high-precision electronic quantitative packaging scale of the present invention, we divide it into 20 measurements through the control box 7, and control the feeding amount through the feeding mechanism 3. The target value set for each measurement of the first 19 times is 50kg. When we weigh 19 times, the material actually entering the packaging bag is 1950kg. Of course, there will be some errors during packaging, which is also ±1 / 1000*950kg, that is, ±0.95kg, that is, there is still 50±0.95kg away from the target value. We set this value as the target value of the last scale, so the error of our last scale is the packaging error of the packaging scale. The accuracy we can achieve for the last scale is 50±0.95kg*±1 / 1000≈±0.05kg. Obviously, compared with the packaging error ±1kg of the existing packaging scale, the error is reduced by 20 times. High-precision quantitative packaging is achieved.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An electronic quantitative packaging scale, comprising a frame (1) and a material feeding and weighing platform (2) mounted on the top surface of the frame (1), characterized in that: A weighing mechanism (4) is installed on the surface of the weighing platform (2), and the weighing mechanism (4) comprises a weighing sensor (41) fixedly connected to the weighing mechanism (4), and a weighing bin assembly (43) is hoisted and connected in the inner cavity of the weighing mechanism (4); The top of the weighing mechanism (4) is connected to a feeding mechanism (3); The bottom of the weighing mechanism (4) is connected to a feeding hopper (5), the bottom of the feeding hopper (5) is connected to a bag clamping mechanism (6), a conveying mechanism (8) is provided directly below the bag clamping mechanism (6), a control box (7) is provided on the side of the conveying mechanism (8), and the control box (7) is electrically connected to the feeding mechanism (3) for automatically calculating and controlling the weighing weight of the feeding; The feeding mechanism (3) comprises a feeding port (31) at the top, a buffer bin (32) is obliquely arranged at the bottom of the feeding port (31), a rectangular plug plate (33) is plugged and installed on the top side wall of the buffer bin (32), a vertically arranged feeding bin (34) is connected to the bottom of the buffer bin (32), and a feeding amount adjustment mechanism (35) is also arranged in the cavity of the feeding bin (34); A square weighing feed port (42) is provided at the center of the top of the weighing mechanism (4), the weighing bin assembly (43) and the weighing sensor (41) are connected by hoisting, the weighing bin assembly (43) comprises a weighing bin (431), a horizontal suspension rod (432) is provided on the top of the weighing bin (431) and passes through the top and bottom of the weighing bin (431), both ends of the horizontal suspension rod (432) are hoisted on the weighing sensor (41) by ropes, an opening and closing installation frame (433) is connected to the bottom of the weighing bin (431), two rotating shafts (434) are symmetrically provided at the bottom of the left and right sides of the opening and closing installation frame (433), and an opening and closing claw (435) is rotatably sleeved on the surface of the rotating shaft (434), one opening and closing claw (435) is provided on each side and symmetrically arranged, and the top ends of the two opening and closing claws (435) on the left and right are respectively hinged to the two ends of the opening and closing cylinder (436); The bag clamping mechanism (6) comprises a bag clamping frame (61) arranged below the frame (1); a lifting cylinder (62) is fixedly installed in the middle of the bag clamping frame (61) and on the crossbeam; a lifting slider (63) is connected to the top of the lifting cylinder (62); a bag clamping horizontal mounting frame (64) is horizontally arranged on the front surface of the lifting slider (63); four lifting clamps (65) are extended outwardly from the four corners of the bag clamping horizontal mounting frame (64); two inclined bag clamping cylinders (67) are also arranged at the bottom of the bag clamping horizontal mounting frame (64); and the output end of each bag clamping cylinder (67) is also connected to a horizontally arranged bag clamping ring (68).

2. The electronic quantitative packaging scale according to claim 1, characterized in that: The material discharge amount adjustment mechanism (35) comprises a transmission cylinder (354) fixedly mounted on the outer side wall of the material discharge bin (34); a transmission block (353) is hingedly connected to the output end of the transmission cylinder (354); the lower end of the transmission block (353) is movably fixed to the side wall of the material discharge bin (34); and the bottom end of the transmission block (353) is fixedly connected to an adjustment frame rotating shaft (352).

3. An electronic quantitative packaging scale according to claim 2, characterized in that: The adjusting frame rotating shaft (352) and the transmission block (353) are perpendicular to each other and pass through the left and right side walls of the material discharge bin (34). The left and right side walls of the material discharge bin (34) are also arranged perpendicular to each other. The bottom of the adjusting frame rotating shaft (352) is fixedly connected to a material discharge amount adjusting frame (351). The bottom of the material discharge amount adjusting frame (351) is an arc surface structure. An arc-shaped opening (355) is provided on the edge of the left side frame of the material discharge amount adjusting frame (351).

4. The electronic quantitative packaging scale according to claim 1, characterized in that: The slide rails on both sides of the lifting slider (63) and the bag clamping frame (61) match and are slidably connected.

5. The electronic quantitative packaging scale according to claim 1, characterized in that: The hoisting clamping member (65) is also provided with a hoisting clamping cylinder (66).

6. The electronic quantitative packaging scale according to claim 1, characterized in that: The conveying mechanism (8) comprises a conveying frame (81) installed directly below the bag clamping horizontal mounting frame (64); a conveying belt (82) is provided on the surface of the conveying frame (81); a conveying motor (83) is also installed on the side of the conveying frame (81); the conveying motor (83) and the conveying belt (82) are transmission-connected to transport the packaging bag (69) packed by the bag clamping to the next workstation.

7. The high-precision weighing method of an electronic quantitative packaging scale according to claim 1, characterized in that The specific weighing steps are: (1) Setting and calculating through the control box (7), dividing the target weight M of the material to be packaged into n equal parts, that is, the measured weight of a single part is M / n; (2) Use an electronic fixed wheel packaging scale to weigh n-1 times according to the measured weight of M / n, and put the material weighed each time into the packaging bag; (3) The control box (7) automatically records the cumulative weight M / n×(n-1) of the previous n-1 times of materials; (4) The control box (7) automatically calculates the difference between the target weight M and the cumulative weight of the previous n-1 materials M / n×(n-1), i.e., M - M / n×(n-1); (5) The above difference M-M / n×(n-1) is used as the adjustment error value of the nth scale; (6) Adjust the last weighing, i.e. the measured weight of the nth weighing, to M / n±[M- M / n×(n-1)]; (7) The material weighed in the nth weighing and the material weighed cumulatively in the previous n-1 times can be combined to complete the high-precision weighing of the material by the electronic quantitative packaging scale.

Images