Split type high-capacity serial dynamic double-scale

Abstract

The utility model discloses a split type high-capacity serial dynamic double scale, which comprises a weighing platform A and a weighing platform B, the weighing platform A and the weighing platform B are arranged in series along the direction of the conveying line, and the weighing-out end of the weighing platform A corresponds to the weighing-in end of the weighing platform B; the weighing platform A is provided with scale-A weighing photoelectricity at two sides of the weighing end, scale-A middle photoelectricity at two sides of the middle, and scale-A weighing photoelectricity at two sides of the weighing end; the two sides of the weighing end of the weighing platform B are provided with weighing photoelectricity of the weighing platform B, and the two sides of the weighing end of the weighing platform B are provided with weighing photoelectricity of the weighing platform B. The length of the A scale conveying platform is smaller than that of the B scale conveying platform, and the distance between the B scale input photoelectric device and the B scale output photoelectric device is larger than the distance between the A scale input photoelectric device and the A scale middle photoelectric device. The scale A in-scale photoelectricity and the scale A middle photoelectricity achieve package length classification and weighing platform selection, the scale A and the scale B are independently calibrated in the same measuring range and independently weigh (the scale A weighs short packages, and the scale B weighs long packages), and compared with combined weighing of the scale A and the scale B, the resolution ratio is improved, and the weighing precision and efficiency are improved.

Description

Technical Field

[0001] The utility model belongs to the field of logistics automation equipment and relates to a split-type high-throughput cargo serial dynamic double scale. Background Art

[0002] High throughput efficiency is the development trend of dynamic DWS systems. The weighing efficiency of dynamic scales has always been a key factor in improving the performance of DWS systems. To meet the express sorting industry's pursuit of continuous cost reduction and improved sorting efficiency, dual-table dynamic scales offer greater efficiency advantages over single-table dynamic scales to accommodate applications where package lengths vary randomly. Currently, dual-table weighing modes, including A-scale weighing and A+B-scale weighing, are commonly used. All packages are divided into two categories based on a certain size: short and long. Scale A weighs short packages, while scale A+B weighs long packages. This dual-table dynamic scale uses two scales for collaborative weighing of long packages, with the package weight being the sum of the weights of scales A and B. The scale's overall length is relatively short, saving some installation space. However, there are three problems. First, it is impossible to directly calibrate the combined weighing platform consisting of weighing platform A and weighing platform B, resulting in a decrease in weighing accuracy in the A+B weighing mode; second, the range of the combined weighing platform is twice that of a single-table weighing platform. The graduation value of the combined weighing platform increases and the resolution decreases, which is equivalent to using a large-scale scale to weigh a small package, resulting in reduced weighing precision; third, when the package length is measured by multiplying the time a single photoelectric sensor is blocked by the speed of the conveyor belt, the measurement error is large, and some short packages are mistakenly judged as long packages, resulting in a loss of currency efficiency. Utility Model Content

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a split high-throughput cargo series dynamic dual scale, which adopts A scale weighing and B scale weighing mode to realize calibration and package length judgment, improve resolution and improve weighing accuracy.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A split-type high-throughput tandem dynamic double scale, including a scale platform A and a scale platform B;

[0006] Scale platforms A and B are arranged in series along the conveyor line, with the outflow end of scale platform A butted against the inflow end of scale platform B.

[0007] The A scale platform is equipped with A scale input photoelectric indicators on both sides of the input end, A scale middle photoelectric indicators on both sides of the middle, and A scale output photoelectric indicators on both sides of the output end; the B scale platform is equipped with B scale input photoelectric indicators on both sides of the input end, and B scale output photoelectric indicators on both sides of the output end;

[0008] The length of the conveyor platform of scale A is shorter than that of scale B. The distance between the photoelectric input of scale B and the photoelectric output of scale B is greater than the distance between the photoelectric input of scale A and the photoelectric center of scale A.

[0009] Preferably, the A scale platform includes an A scale conveying platform and an A scale mounting base, and the A scale conveying platform is located on top of the A scale mounting base. The B scale platform includes a B scale conveying platform and a B scale mounting base, and the B scale conveying platform is located on top of the B scale mounting base.

[0010] Furthermore, at least four adjustment shoe angles are provided at the bottom of the A scale mounting base and the B scale mounting base.

[0011] Furthermore, the A scale conveyor platform and the B scale conveyor platform both include a conveyor belt, a pad, an active roller assembly and a driven roller assembly. The active roller assembly and the driven roller assembly are respectively rotatably connected to the two ends of the pad, and the active roller assembly and the driven roller assembly are connected by a conveyor belt.

[0012] Furthermore, a motor reducer assembly is provided on both the A scale mounting base and the B scale mounting base, and the motor reducer assembly is connected to the active roller assembly through a synchronous belt.

[0013] Furthermore, photovoltaic mounting aluminum profiles are provided above both sides of the top of the pad.

[0014] Furthermore, weighing sensors are provided at the bottom of the A scale conveying platform and the B scale conveying platform.

[0015] Furthermore, there are four weighing sensors, which are located at the four corners of the bottom of the A scale conveyor platform and the B scale conveyor platform.

[0016] Furthermore, a junction box is provided on both the A scale mounting base and the B scale mounting base, and the junction box is connected to the weighing sensor.

[0017] Preferably, the A and B scale platforms have the same width.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The utility model optimizes the weighing mode, adopts the weighing mode of A scale platform and B scale platform, does not use the A+B combination scale platform for weighing, optimizes the double scale structure, and the A scale platform and B scale platform are arranged in series along the conveyor line direction. The A scale platform and the B scale platform can be calibrated separately to ensure the accuracy of weighing; the A scale platform and the B scale platform have the same measuring range, the A scale platform and the B scale platform are independent in mounting base structure, the weighing instrument is independent in function and does not affect each other, avoiding the problem of increased weighing division value and reduced resolution of the combined weighing of the A scale platform and the B scale platform; the A scale platform and the B scale platform are both equipped with in-weighing and out-weighing photoelectric devices, among which the A scale middle photoelectric device is also installed on the A scale platform, and the distance between the A scale middle photoelectric device and the A scale in-weighing photoelectric device on the A scale platform is the dividing length between long packages and short packages; the judgment of the package length is no longer affected by the fluctuation of the scale platform speed during the package entering the scale, thereby improving the accuracy of the package length judgment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural isometric view of the utility model's split-type high-throughput tandem dynamic double scale;

[0021] Figure 2 This is the main view of the utility model split-type high-throughput series dynamic double scale;

[0022] Figure 3 This is a top view of the utility model's split-type high-throughput tandem dynamic double scale;

[0023] Figure 4 This is the left view of the utility model split-type high-throughput tandem dynamic double scale;

[0024] Figure 5 This is a schematic diagram of the working principle of the utility model split-type series dynamic double scale.

[0025] In the figure, 1-adjusting shoe angle, 2-A scale mounting base, 3-driven roller assembly, 4-A scale inlet photoelectric, 5-A scale conveyor belt, 6-A scale platform pad, 7-A scale intermediate photoelectric, 8-A scale outlet photoelectric, 9-B scale inlet photoelectric, 10-Z-shaped connecting block, 11-photoelectric mounting aluminum profile, 12-B scale platform pad, 13-B scale outlet photoelectric, 14-active roller assembly, 15-B scale conveyor belt, 16-synchronous belt, 17-B scale mounting base, 18-junction box, 19-A scale conveyor platform, 20-weighing sensor assembly, 21-motor reducer assembly 22-B scale conveyor platform. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms "installed", "connected", and "connected" should be understood in a broad sense, for example, they can be fixedly connected, detachably connected, or integrally connected; they can be mechanically connected, electrically connected, or able to communicate with each other; they can be directly connected, or indirectly connected through an intermediate medium, or they can be internally connected between two elements or an interactive relationship between two elements. The term "and / or" used herein includes any and all combinations of one or more related listed items. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to the specific circumstances. The terms used herein in the specification of this utility model are only for the purpose of describing specific embodiments and are not intended to limit this utility model.

[0029] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0030] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but a person of ordinary skill in the art will recognize the application of other processes and / or the use of other materials.

[0031] like Figure 1 As shown in the figure, a split-type high-throughput tandem dynamic double scale described in the utility model is mainly composed of a scale platform A and a scale platform B.

[0032] The A scale platform includes an A scale conveying platform 19 and an A scale mounting base 2. The A scale conveying platform 19 is located on the top of the A scale mounting base 2. The B scale platform includes a B scale conveying platform 22 and a B scale mounting base 17. The B scale conveying platform 22 is located on the top of the B scale mounting base 17.

[0033] Scale A mounting base 2 and scale B mounting base 17 serve as the foundation for the entire dynamic scale, securing the entire system and ensuring stability. Scale A mounting base 2 and scale B mounting base 17 are each equipped with at least four adjustment horns, located at the four corners of each horn. These horns are used to adjust the height and level of the Scale A and Scale B conveyor platforms 19 and 22 to accommodate varying surface flatness.

[0034] The A-scale conveyor platform 19 includes an A-scale conveyor belt 5, an A-scale platform pad 6, a photoelectric mounting aluminum profile 11, an active roller assembly 14 and a driven roller assembly 3. The active roller assembly 14 and the driven roller assembly 3 are respectively connected to the two ends of the A-scale platform pad 6 through bearings. The active roller assembly 14 and the driven roller assembly 3 are connected through the A-scale conveyor belt 5 belt to ensure the synchronous movement of the A-scale conveyor belt 5 during operation. The A-scale conveyor belt 5 is arranged around the A-scale platform pad 6. There are two photoelectric mounting aluminum profiles 11, which are located above both sides of the A-scale platform pad 6 and are used to install multiple groups of photoelectric sensors.

[0035] A plurality of weighing sensors 20 are provided on the top of the A-scale mounting base 2. In this embodiment, four weighing sensors 20 are provided on the A-scale mounting base 2, respectively located at the four corners of the top of the A-scale mounting base 2. The fixed end of the weighing sensor 20 is installed on the top of the A-scale mounting base 2. The loading end of the weighing sensor 20 is connected to the four corners of the A-scale platform pad 6 of the A-scale conveyor platform 19 through a Z-shaped connecting block 10. The Z-shaped connecting block 10 is used to fix the loading end of the weighing sensor 20 and connect the weighing sensor 20 to the A-scale platform pad 6 to ensure that the weighing sensor 20 can accurately detect the weight of the goods on the A-scale conveyor belt 5.

[0036] A motor reducer assembly 21 is provided on the A scale mounting base 2. The motor reducer assembly 21 is connected to the active roller assembly 14 through a synchronous belt 16. The motor reducer assembly 21 serves as a power source to drive the active roller assembly 14 to achieve continuous transmission of the A scale conveyor belt 5.

[0037] A junction box 18 is provided on the mounting base 2 of scale A. The junction box 18 is connected to the weighing sensor 20, the motor reducer assembly 21 and the photoelectric sensor. It is used to summarize the electrical connections of the various components of the scale platform A for centralized management and connect the signals of the weighing sensor 20, the motor reducer assembly 21 and the photoelectric sensor.

[0038] In this embodiment, there are three groups of photoelectric sensors on the A-scale conveyor platform 19. The first group is located on both sides of the inlet end of the A-scale conveyor platform 19, serving as the A-scale inlet photoelectric sensor 4. The second group is located on both sides of the middle of the A-scale conveyor platform 19, which can be close to the inlet end or the outlet end, serving as the A-scale intermediate photoelectric sensor 7. The third group is located on both sides of the outlet end of the A-scale conveyor platform 19, serving as the A-scale outlet photoelectric sensor 8. The A-scale inlet photoelectric sensor 4 and the A-scale outlet photoelectric sensor 8 are respectively used to detect the moment when the package enters and leaves the A-scale conveyor platform 19. The A-scale intermediate photoelectric sensor 7 cooperates with the A-scale inlet photoelectric sensor 4 to determine whether the package is a long package.

[0039] The B-scale conveyor platform 22 includes a B-scale conveyor belt 15, a B-scale platform pad 12, a photoelectric mounting aluminum profile 11, an active roller assembly 14 and a driven roller assembly 3. The active roller assembly 14 and the driven roller assembly 3 are respectively connected to the B-scale platform pad 12 at both ends through bearings. The active roller assembly 14 and the driven roller assembly 3 are connected by the B-scale conveyor belt 15 belt to ensure the synchronous movement of the B-scale conveyor belt 15 during operation. The B-scale conveyor belt 15 is arranged around the B-scale platform pad 12. There are two photoelectric mounting aluminum profiles 11, which are located above both sides of the B-scale platform pad 12 and are used to install multiple groups of photoelectric sensors.

[0040] A plurality of weighing sensors 20 are provided on the top of the B-scale mounting base 17. In this embodiment, four weighing sensors 20 are provided on the B-scale mounting base 17, respectively located at the four corners of the top of the B-scale mounting base 17. The fixed ends of the weighing sensors 20 are installed on the top of the B-scale mounting base 17. The loading ends of the weighing sensors 20 are connected to the four corners of the B-scale platform pad 12 of the B-scale conveyor platform 22 through Z-shaped connecting blocks 10. The Z-shaped connecting blocks 10 are used to fix the loading ends of the weighing sensors 20 and connect the weighing sensors 20 to the B-scale platform pad 12 to ensure that the weighing sensors 20 can accurately detect the weight of the goods on the B-scale conveyor belt 15.

[0041] A motor reducer assembly 21 is provided on the B scale mounting base 17. The motor reducer assembly 21 is connected to the active roller assembly 14 through a synchronous belt 16. The motor reducer assembly 21 serves as a power source to drive the active roller assembly 14 to achieve continuous transmission of the B scale conveyor belt 15.

[0042] A junction box 18 is provided on the B scale mounting base 17. The junction box 18 is connected to the weighing sensor 20, the motor reducer assembly 21 and the photoelectric sensor. It is used to summarize the electrical connections of the various components of the B scale platform for centralized management and connect the signals of the weighing sensor 20, the motor reducer assembly 21 and the photoelectric sensor.

[0043] In this embodiment, there are two groups of photoelectric sensors on the B-scale conveyor platform 22, one of which is located on both sides of the inlet end of the B-scale conveyor platform 22, serving as the B-scale inlet photoelectric sensors 9, and the other group is located on both sides of the outlet end of the B-scale conveyor platform 22, serving as the B-scale outlet photoelectric sensors 13. The B-scale inlet photoelectric sensors 9 and the B-scale outlet photoelectric sensors 13 are respectively used to detect the moment when the package enters and leaves the B-scale conveyor platform 22.

[0044] In this embodiment, the length of the A scale conveyor platform 19 is smaller than that of the B scale conveyor platform 22, and they have the same width. The distance between the B scale input photoelectric device 9 and the B scale output photoelectric device 13 is larger than the distance between the A scale input photoelectric device 4 and the A scale middle photoelectric device 7, so that short packages are weighed on the A scale platform and long packages are weighed on the B scale platform.

[0045] The function of the junction box 18 in this embodiment is to compensate for the output error of each weighing sensor 20 and the error caused by the different deformation of the four corners of the weighing platform. By adjusting the potentiometer corresponding to each weighing sensor 20 in the junction box 18, the output of each weighing sensor 20 is made as consistent as possible, thereby further improving the weighing accuracy.

[0046] In this embodiment, the A scale platform and the B scale platform are connected in series end to end and arranged in series along the conveyor line direction. The outflow end of the A scale conveyor platform 19 is connected to the inflow end of the B scale conveyor platform 22. After the package passes through the A scale conveyor platform 19, it can directly enter the B scale conveyor platform 22.

[0047] Since the outgoing end of the A scale conveyor platform 19 is connected to the incoming end of the B scale conveyor platform 22, the A scale outgoing photoelectric sensor 8 and the B scale incoming photoelectric sensor 9 can use the same photoelectric sensor.

[0048] like Figure 5 As shown, the weighing principle of the dynamic dual scale in this embodiment is as follows: the package first enters the dynamic dual scale through scale platform A, and the weight of the package is transmitted to the weighing sensor 20 through the Z-shaped connector 10 and its accessories on the scale platform, causing the weighing sensor 20 to deform and output a weight signal. When the package enters the A scale conveyor platform 19, if the head of the package triggers the A scale entry photoelectric sensor 4 on the A scale conveyor platform 19, the receiver of the A scale entry photoelectric sensor 4 is blocked. Thereafter, if the receiver of the A scale entry photoelectric sensor 4 remains blocked, and the head of the package triggers the A scale middle photoelectric sensor 7 on the A scale conveyor platform 19, the package is a long package, and the A scale conveyor platform 19 activates the direct-through mode, and the package enters the B scale platform for weighing. If the tail of the package triggers the A scale entry photoelectric sensor 4 on the A scale conveyor platform 19, but the head of the package has not yet triggered the A scale middle photoelectric sensor 7, the package is a short package, and the A scale platform activates the weighing function to complete the weighing, and the B scale platform activates the direct-through mode, thereby achieving independent weighing of the A and B scale platforms.

[0049] This utility model first optimizes the weighing mode, adopting the A-scale and B-scale weighing modes, rather than the A+B combination scale. Second, it optimizes the dual-scale structure, using two separate single-scale platforms connected in series to form a dual-scale platform. A set of A-scale intermediate photoelectric sensors 7 is added to the A-scale, which is used in combination with the A-scale inlet photoelectric sensors 4 to classify parcel lengths, improving the accuracy of parcel length determination.

[0050] Scale platform A is a short single scale for weighing short packages, and scale platform B is a long single scale for weighing long packages. Scale platforms A and B are arranged in series along the conveyor line. Scale platforms A and B can be calibrated separately to ensure weighing accuracy.

[0051] Scales A and B have the same measuring range. The mounting bases of scales A and B are independent in structure, and the weighing instruments are independent in function, without affecting each other. This avoids the problem of increased weighing division value and reduced resolution caused by the combination of scales A and B.

[0052] Both scales A and B are equipped with weighing and unweighing sensors. Scale A also features a scale intermediate sensor 7. The distance between scale intermediate sensor 7 and scale inlet sensor 4 on scale A defines the demarcation between long and short packages. Package length determination is no longer affected by scale speed fluctuations during weighing.

[0053] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0054] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of this patent should not be determined with reference to the above description, but rather with reference to the preceding claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein from the preceding claims is not a disclaimer of such subject matter, nor should it be considered that the applicant did not consider such subject matter to be part of the disclosed utility model subject matter.

Claims

1. A split type high throughput tandem dynamic double scale, characterized in that: Including A scale platform and B scale platform; Scale platforms A and B are arranged in series along the conveyor line, with the outflow end of scale platform A butted against the inflow end of scale platform B. The A scale platform is provided with A scale inlet photoelectric devices (4) on both sides of the inlet end, A scale middle photoelectric devices (7) on both sides of the middle end, and A scale outlet photoelectric devices (8) on both sides of the outlet end; the B scale platform is provided with B scale inlet photoelectric devices (9) on both sides of the inlet end, and B scale outlet photoelectric devices (13) on both sides of the outlet end; The length of the A scale conveyor platform (19) is shorter than that of the B scale conveyor platform (22), and the distance between the B scale inlet photoelectric device (9) and the B scale outlet photoelectric device (13) is greater than the distance between the A scale inlet photoelectric device (4) and the A scale middle photoelectric device (7).

2. The split-type high-throughput tandem dynamic dual scale according to claim 1, characterized in that: The A scale platform includes an A scale conveying platform (19) and an A scale mounting base (2), wherein the A scale conveying platform (19) is located on top of the A scale mounting base (2), and the B scale platform includes a B scale conveying platform (22) and a B scale mounting base (17), wherein the B scale conveying platform (22) is located on top of the B scale mounting base (17).

3. The split-type high-throughput tandem dynamic dual scale according to claim 2, characterized in that: The bottom of the A scale mounting base (2) and the B scale mounting base (17) are both provided with at least four adjustment shoe angles.

4. The split-type high-throughput tandem dynamic dual scale according to claim 2, characterized in that: The A scale conveying platform (19) and the B scale conveying platform (22) both include a conveyor belt, a pad, an active roller assembly (14) and a driven roller assembly (3), wherein the active roller assembly (14) and the driven roller assembly (3) are rotatably connected to both ends of the pad, and the active roller assembly (14) and the driven roller assembly (3) are connected via a conveyor belt.

5. The split-type high-throughput tandem dynamic dual scale according to claim 4, characterized in that: A motor reducer assembly (21) is provided on both the A scale mounting base (2) and the B scale mounting base (17). The motor reducer assembly (21) is connected to the active roller assembly (14) via a synchronous belt (16).

6. The split-type high-throughput tandem dynamic dual scale according to claim 4, characterized in that: Photovoltaic mounting aluminum profiles are provided above both sides of the top of the pad.

7. The split-type high-throughput tandem dynamic dual scale according to claim 2, characterized in that: The bottoms of the A scale conveying platform (19) and the B scale conveying platform (22) are both provided with weighing sensors (20).

8. The split-type high-throughput tandem dynamic dual scale according to claim 7, characterized in that: There are four weighing sensors (20), which are located at the four corners of the bottom of the A scale conveying platform (19) and the B scale conveying platform (22).

9. The split-type high-throughput tandem dynamic dual scale according to claim 7, characterized in that: A junction box (18) is provided on both the A scale mounting base (2) and the B scale mounting base (17), and the junction box (18) is connected to the weighing sensor (20).

10. The split-type high-throughput tandem dynamic dual scale according to claim 1, characterized in that: Weighing platforms A and B have the same width.

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