Movable screen printing plate for silk-screen printing
By designing a mobile screen plate in screen printing, using the transmission system of rotating screws and nuts and electromagnetic attraction devices, the uniform movement of the screen frame is achieved, and the problems of uneven coating of paste and assembly difficulties in traditional screen printing are solved. Improved yield and sample uniformity.
Patent Information
- Application Number
- CN202421209964.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-30
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-05-30
AI Technical Summary
In traditional screen printing technology, manual operation leads to uneven coating of slurry, prone to volcanic defects, and inconvenient assembly, low yield, and poor sample uniformity.
Design a mobile screen plate for screen printing, adopting a screen frame, screen and screen plate lifting device, and realizes a uniform speed rise and fall of the screen frame through a transmission system of rotating screws and nuts, combining with a motor and magnetic touch switch. Ensure that the four corners of the screen move at a uniform speed at the same time and ensure that the slurry is evenly coated.
The slurry is uniformly coated layer by layer, forming a complete and high three-dimensional effect, improving the yield and sample uniformity, and reducing manual operation errors.
Smart Images
Figure CN222291258U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a screen printing process, in particular to a mobile screen plate used for screen printing. Background Art
[0002] In recent years, as people's living standards have gradually improved, the pursuit of shoe beauty has become higher and higher, requiring not only durability but also three-dimensional beauty. Traditional printing technology uses the adhesion between the screen and the slurry to cover the screen with a thick coating of slurry, and then manually lift the screen to raise the height of the slurry, thereby forming a special high three-dimensional effect. However, the strength and speed of manual gestures can only be operated by feeling and experience, and there is no uniformity. There are also certain difficulties in the later assembly. It is also common to have abnormal operation during slurry pulling, resulting in no slurry in the middle of the mountain effect, forming a defective crater. Utility Model Content
[0003] In view of the above problems, the present application provides a mobile screen for screen printing, which is used to solve the technical problems of generating volcanic defect mouths, non-uniform operation, and inconvenient assembly.
[0004] To achieve the above-mentioned purpose, in a first aspect, the present application provides a mobile screen for screen printing, comprising a screen frame, a screen and a screen lifting device, wherein the screen frame is composed of four frame frames connected end to end, and adjacent frames are perpendicular to each other, the screen is installed inside the screen frame, and the screen lifting device is installed at the corner outside the screen frame, and one screen lifting device is installed at each corner, and the screen lifting device comprises a rotating screw and a nut, the nut is drivingly connected to the rotating screw, and the nut is fixedly connected to the screen frame, and the screen lifting device is used to drive the screen frame to rise or fall at a uniform speed.
[0005] As an embodiment of the utility model, the screen lifting device also includes a motor, which is installed on the top of the rotating screw, and the output end of the motor is drivingly connected to the rotating screw, and the motor is used to drive the rotating screw to rotate at a constant speed.
[0006] In this way, the motor is started, and the motor drives the rotating screw to rotate clockwise or counterclockwise. When the rotating screw rotates clockwise, the nut moves upward at a constant speed, and when the rotating screw rotates counterclockwise, the nut moves downward at a constant speed.
[0007] As an implementation mode of the utility model, the screen lifting device further comprises a bearing, and the bearing is installed at the bottom of the rotating screw.
[0008] In this way, the bearing fixes the position of the rotating screw, so that the rotating screw maintains stable rotation in the vertical direction, supports the relative movement between the rotating screw and the nut, and reduces the friction coefficient during the rotation process.
[0009] As an embodiment of the utility model, a screw magnetic touch switch is provided on the upper part of the screen frame, and a first button and a second button are provided on the screw magnetic touch switch, the first button and the second button are electrically connected to the motor respectively, the first button is used to control the uniform speed rise of the screen lifting device, and the second button is used to control the uniform speed descent of the screen lifting device.
[0010] In this way, it is convenient for the staff to operate. When the first button is touched, the motor rotates forward, the rotating screw rotates clockwise, and the nut rises at a constant speed. When the second button is touched, the motor rotates reversely, the rotating screw rotates counterclockwise, and the nut descends at a constant speed.
[0011] As an implementation mode of the utility model, the interior of the nut is provided with an internal thread, the rotating screw is provided with an external thread, and the internal thread is adapted to the external thread.
[0012] In this way, the nut is connected to the rotating screw by helical transmission, and the rotating screw and the nut are matched with each other through the external thread and the internal thread, so that the nut moves at a uniform speed as the rotating screw rotates.
[0013] As an embodiment of the utility model, the screen lifting device includes an electric magnetic sheet, a permanent magnetic sheet and a bearing, the bearing is located at the bottom of the rotating screw, the permanent magnetic sheet is arranged in the bearing, the electric magnetic sheet is arranged at the bottom of the rotating screw, the electric magnetic sheet is arranged opposite to the permanent magnetic sheet, and the electric magnetic sheet is connected to an external power supply.
[0014] In this way, the electric magnetic sheet is energized and the magnetism is turned on. When the magnetism of the electric magnetic sheet is the same as that of the permanent magnetic sheet, a repulsive force is generated. The repulsive force and the bearing work together to make the rotating screw move upward at a constant speed, thereby driving the nut and the screen frame to rise at a constant speed. When the magnetism of the electric magnetic sheet is opposite to that of the permanent magnetic sheet, an attractive force is generated. The attractive force and the bearing work together to make the rotating screw move downward at a constant speed and return to its original position, thereby driving the nut and the screen frame to descend at a constant speed.
[0015] As an implementation mode of the utility model, the screen lifting device is L-shaped, and the right angle of the screen lifting device is in contact with the right angle of the outside of the screen frame.
[0016] In this way, it is convenient for the screen lifting device to drive the four corners of the screen frame to run at a uniform speed at the same time, thereby driving the entire screen to move upward or downward at a uniform speed, thereby improving the stability of operation.
[0017] As an implementation mode of the utility model, a T-shaped handle is provided on one side of the mesh frame.
[0018] This makes it easy for the operator to grab the handle and adjust the position of the screen.
[0019] Different from the prior art, the technical solution of the present application installs a screen lifting device at a right angle outside the screen frame, and the four right angles of the screen frame are lifted up at a uniform speed through the screen lifting device, so that the entire screen moves upward at a uniform speed, so that the slurry is evenly coated on the screen layer by layer, forming a complete and high three-dimensional effect, overcoming the problems of low yield rate, poor sample uniformity and difficult double matching in the later stage caused by manual operation.
[0020] The above-mentioned records related to the content of the utility model are only an overview of the technical solution of the present application. In order to enable ordinary technicians in the field to more clearly understand the technical solution of the present application, and then implement it according to the text of the specification and the contents recorded in the drawings, and to make the above-mentioned purpose and other purposes, features and advantages of the present application easier to understand, the following is an explanation in combination with the specific implementation method and drawings of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The drawings are only used to illustrate the principles, implementation methods, applications, characteristics and effects of the specific embodiments of the present application and other related contents, and shall not be considered as limitations of the present application.
[0022] In the drawings of the specification:
[0023] Figure 1 A schematic structural diagram of a mobile screen for screen printing in this application;
[0024] Figure 2 A top view of a mobile screen for screen printing in this application;
[0025] Figure 3 A cross-section of a screen lifting device for a mobile screen for screen printing in this application Figure 1 ;
[0026] Figure 4 A cross-section of a screen lifting device for a mobile screen for screen printing in this application Figure 2 ;
[0027] Figure 5 This is a schematic structural diagram of a rotating screw and a nut of a mobile screen for screen printing in the present application.
[0028] The reference numerals in the above drawings are described as follows:
[0029] 1. Screen frame,
[0030] 2. Silk screen,
[0031] 3. Screen lifting device, 31. Rotating screw, 311. External thread, 32. Nut, 321. Internal thread, 33. Motor, 34. Electric magnetic sheet, 35. Permanent magnetic sheet, 36. Bearing,
[0032] 4. Screw magnetic touch switch, 41. First button, 42. Second button,
[0033] 5. Lean on it. DETAILED DESCRIPTION
[0034] In order to explain in detail the possible application scenarios, technical principles, specific schemes that can be implemented, and the purposes and effects that can be achieved, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.
[0035] Reference to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way to form a corresponding implementable technical solution.
[0036] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms in this document is only for describing specific embodiments and is not intended to limit this application.
[0037] In the description of this application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships may exist, for example, X and / or Y, which means: X exists, Y exists, and X and Y exist at the same time. In addition, the character " / " in this article generally indicates that the objects before and after are in a logical relationship of "or".
[0038] In the present application, terms such as “first” and “second” are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.
[0039] Without further limitations, in this application, the words "include", "comprises", "has" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those limited elements, but also other elements not explicitly listed, or also include elements inherent to such process, method or product.
[0040] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than", "less than", "exceed" and the like are understood to exclude the number itself; expressions such as "above", "below", "within" and the like are understood to include the number itself. In addition, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups", "multiple times", etc., unless otherwise clearly and specifically limited.
[0041] In the description of the embodiments of the present application, space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and do not indicate or imply that the referred device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.
[0042] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms such as "install", "connect", "connect", "fix", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For technicians in the technical field to which the present application belongs, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.
[0043] According to some embodiments of the present application, please refer to Figures 1 to 5The present embodiment relates to a mobile screen for screen printing 2, including a screen frame 1, a screen 2 and a screen lifting device 3. The screen frame 1 is composed of four frames connected end to end, and adjacent frames are perpendicular to each other. The screen 2 is installed inside the screen frame 1, and the screen lifting device 3 is installed at the corner outside the screen frame 1. One screen lifting device 3 is installed at each corner. The screen lifting device 3 includes a rotating screw 31 and a nut 32. The nut 32 is transmission-connected to the rotating screw 31, and the nut 32 is fixedly connected to the screen frame 1. The screen lifting device 3 is used to drive the screen frame 1 to rise or fall at a uniform speed.
[0044] When screen printing is used to create a three-dimensional pattern, it is necessary to move the screen and apply slurry layer by layer to form a 3D effect. However, the force and speed of manually lifting the screen rely on feeling and experience, which cannot be accurately controlled and often have large errors. Figure 1 As shown, in this embodiment, a screen lifting device 3 is installed at the four corners of the outside of the screen, the screen lifting device 3 is close to the four corners of the screen frame 1, the shell height of the screen lifting device 3 is not less than the height of the screen frame 1, and the four screen lifting devices 3 can be connected to a control switch. When the control switch is started, the four screen lifting devices 3 are started at the same time, and the screen lifting devices 3 drive the four corners of the screen frame 1 to be lifted up at a uniform speed at the same time, so that the whole screen can move upward at a uniform speed, and the slurry is evenly applied on the dyeing and printing material at different heights to form a complete three-dimensional pattern, which can reduce manual operation errors and prevent uneven slurry or gaps.
[0045] According to some embodiments of the present application, optionally, the screen lifting device 3 also includes a motor 33, which is installed on the top of the rotating screw 31, and the output end of the motor 33 is transmission-connected to the rotating screw 31, and the motor 33 is used to drive the rotating screw 31 to rotate at a constant speed.
[0046] Thus, the motor 33 is started, and the motor 33 drives the rotating screw 31 to rotate clockwise or counterclockwise. When the rotating screw 31 rotates clockwise, the nut 32 moves upward at a constant speed, and when the rotating screw 31 rotates counterclockwise, the nut 32 moves downward at a constant speed.
[0047] According to some embodiments of the present application, optionally, the screen lifting device 3 further includes a bearing 36 , and the bearing 36 is installed at the bottom of the rotating screw 31 .
[0048] In this way, the bearing 36 fixes the position of the rotating screw 31, so that the rotating screw 31 maintains stable rotation in the vertical direction, supports the relative movement between the rotating screw 31 and the nut 32, and reduces the friction coefficient during the rotation process.
[0049] like Figure 3As shown, the motor 33 is arranged above the rotating screw 31. The rotating screw 31 has a certain lead. The rotating screw 31 with a corresponding lead can be selected according to the three-dimensional pattern effect to be produced by printing the screen 2. The specifications of the rotating screw 31 are compatible with the specifications of the bearing 36. The rotating screw 31 can rotate under the support of the bearing 36, so that the rotation direction of the rotating screw 31 is more stable.
[0050] According to some embodiments of the present application, optionally, a screw magnetic touch switch 4 is provided on the upper portion of the screen frame 1, and a first button 41 and a second button 42 are provided on the screw magnetic touch switch 4. The first button 41 and the second button 42 are electrically connected to the motor 33 respectively. The first button 41 is used to control the uniform rise of the screen lifting device 3, and the second button 42 is used to control the uniform descent of the screen lifting device 3.
[0051] One screw magnetic touch switch 4 can control four motors 33 to rotate forward and reverse at the same time.
[0052] In this way, it is convenient for the staff to operate. When the first button 41 is touched, the motor 33 rotates forward, the rotating screw 31 rotates clockwise, and the nut 32 rises at a constant speed. When the second button 42 is touched, the motor 33 rotates reversely, the rotating screw 31 rotates counterclockwise, and the nut 32 descends at a constant speed.
[0053] like Figure 2 As shown, the screw magnetic touch switch 4 can be set on the upper surface of one end of the screen frame 1, which is convenient for staff to operate. The screw magnetic touch switch 4 can adopt a micro switch. The first button 41 and the second button 42 can be set side by side on the screw magnetic touch switch 4. The buttons can be designed as touch buttons. When the buttons are gently touched, the motor 33 can quickly respond accordingly, which is convenient for operation. When the screen needs to be lifted during use, the first button 41 is pressed, and the motor 33 rotates forward to drive the screen to rise at a uniform speed. When the screen needs to be lowered, the second button 42 is pressed, and the motor 33 reverses to drive the screen to descend at a uniform speed.
[0054] According to some embodiments of the present application, optionally, an internal thread 321 is provided inside the nut 32 , and an external thread 311 is provided on the rotating screw 31 , and the internal thread 321 is adapted to the external thread 311 .
[0055] In this way, the nut 32 is connected to the rotating screw 31 by helical transmission, and the rotating screw 31 and the nut 32 cooperate with each other through the external thread 311 and the internal thread 321 , so that the nut 32 moves at a uniform speed as the rotating screw 31 rotates.
[0056] like Figure 5As shown, the nut 32 can be sleeved on the surface of the rotating screw 31, the outer surfaces of the four nuts 32 are fixedly connected to the frames of the four corners of the screen frame 1, and the internal threads 321 of the four nuts 32 fit the external threads 311 of the rotating screw 31. During the rotation of the rotating screw 31, the nut 32 moves at a constant speed through the cooperation between the external threads 311 and the internal threads 321. When in use, the first button 41 is pressed, the motor 33 rotates forward to drive the screw to rotate clockwise, and the screw drives the nut 32 to move upward at a constant speed, thereby achieving a uniform rise of the screen, and the second button 42 is pressed, the motor 33 rotates reversely to drive the screw to rotate counterclockwise, and the screw drives the nut 32 to move downward at a constant speed, thereby achieving a uniform descent of the screen.
[0057] According to some embodiments of the present application, optionally, the screen lifting device 3 includes an electric magnetic sheet 34, a permanent magnetic sheet 35 and a bearing 36, the bearing 36 is located at the bottom of the rotating screw 31, the permanent magnetic sheet 35 is arranged in the bearing 36, the electric magnetic sheet 34 is arranged at the bottom of the rotating screw 31, the electric magnetic sheet 34 and the permanent magnetic sheet 35 are arranged opposite to each other, and the electric magnetic sheet 34 is connected to an external power supply.
[0058] In this way, the electric magnetic sheet 34 is energized and its magnetism is turned on. When the magnetism of the electric magnetic sheet 34 is the same as that of the permanent magnetic sheet 35, a repulsive force is generated. The repulsive force and the bearing 36 work together to make the rotating screw 31 move upward at a constant speed, thereby driving the nut 32 and the screen frame 1 to rise at a constant speed. When the magnetism of the electric magnetic sheet 34 is opposite to that of the permanent magnetic sheet 35, an attractive force is generated. The attractive force and the bearing 36 work together to make the rotating screw 31 move downward at a constant speed and return to its original position, thereby driving the nut 32 and the screen frame 1 to descend at a constant speed.
[0059] like Figure 4 As shown, the bearing 36 has a certain height. The bearing 36 with matching height specifications can be selected according to the distance that the screen needs to be lifted. The bearing 36 can be a seated bearing. The internal dimensions of the bearing 36 match the specifications of the electromagnetic sheet, the permanent magnet sheet 35 and the rotating screw 31, so that the rotating screw 31 can be inserted into the bearing 36, and the electromagnetic sheet and the permanent magnet sheet 35 can also be placed in the bearing 36. When in use, the electric magnetic sheet 34 is energized, the electric magnetic sheet 34 will generate magnetism, and the permanent magnet sheet 35 will also be magnetic. According to the principle that like repels like and opposites attract, the rotating screw 31 moves up and down inside the bearing 36, and the nut 32 outside the rotating screw 31 moves up and down at a uniform speed, thereby driving the screen frame 1 to rise or fall at a uniform speed. When the suction force is generated, the suction force causes the permanent magnet sheet 35 to leave the platen, and the staff can move the sucked permanent magnet sheet 35 to the next printing position.
[0060] According to some embodiments of the present application, optionally, the screen lifting device 3 is L-shaped, and the right angle of the screen lifting device 3 fits the right angle of the outside of the screen frame 1.
[0061] In this way, it is convenient for the screen lifting device 3 to drive the four corners of the screen frame 1 to run at a uniform speed at the same time, thereby driving the entire screen to move upward or downward at a uniform speed, thereby improving the stability of operation.
[0062] According to some embodiments of the present application, optionally, a T-shaped handle 5 is provided on one side of the screen frame 1 .
[0063] In this way, it is convenient for the operator to grab the handle 5 and adjust the position of the screen.
[0064] The technical solution of the present application installs a screen lifting device 3 at a right angle position outside the screen frame 1. The screen lifting device 3 drives the four right angles of the screen frame 1 to be lifted at a uniform speed, and the entire screen moves upward at a uniform speed, so that the slurry is evenly coated on the screen layer by layer, forming a complete and high three-dimensional effect, overcoming the problems of low yield rate of manual operation, poor sample uniformity, and difficult double matching in the later stage.
[0065] In this embodiment, the power mechanism or power unit includes but is not limited to an engine, a motor, a pneumatic tool, a hydraulic pump, etc. The power unit also includes a direct power source and an indirect power source. The direct power source can provide power by itself, such as an engine, a motor, etc., and the indirect power source includes a cylinder, a hydraulic cylinder, etc. The power mechanism or power unit can drive the linear reciprocating motion of the execution unit through the matching of gear racks, the matching of sliders and slide grooves, and the matching of screws and nuts.
[0066] In this embodiment, the transmission mechanism or transmission unit includes a reducer, a gearbox, a worm gear mechanism, a connecting rod mechanism, a compound mechanism, etc. The transmission mechanism or transmission unit is used to transfer power from the power mechanism or power unit to the actuator or actuator unit.
[0067] In this embodiment, the actuator or actuator unit includes but is not limited to a compression mechanism, a rotation mechanism, a swing mechanism, a vibration mechanism, a lifting mechanism, a cutting mechanism, etc.
[0068] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.
[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.
Claims
1. A mobile screen for screen printing, characterized in that: include: A screen frame, the screen frame is composed of four frames connected end to end, and the adjacent frames are perpendicular to each other; A wire mesh installed inside the mesh frame; as well as A screen lifting device is installed at a corner outside the screen frame, and one screen lifting device is installed at each corner. The screen lifting device includes a rotating screw and a nut. The nut is drivingly connected to the rotating screw, and the nut is fixedly connected to the screen frame. The screen lifting device is used to drive the screen frame to rise or fall at a uniform speed.
2. The mobile screen for screen printing according to claim 1, characterized in that: The screen lifting device also includes a motor, which is installed on the top of the rotating screw. The output end of the motor is drivingly connected to the rotating screw, and the motor is used to drive the rotating screw to rotate at a constant speed.
3. The mobile screen for screen printing according to claim 2, characterized in that: The screen lifting device also includes a bearing, which is installed at the bottom of the rotating screw.
4. The mobile screen for screen printing according to claim 3, characterized in that: A screw magnetic touch switch is provided on the upper part of the screen frame, and a first button and a second button are provided on the screw magnetic touch switch. The first button and the second button are electrically connected to the motor respectively. The first button is used to control the uniform rise of the screen lifting device, and the second button is used to control the uniform descent of the screen lifting device.
5. The mobile screen for screen printing according to claim 1, characterized in that: The nut is provided with an internal thread inside, and the rotating screw is provided with an external thread, and the internal thread is adapted to the external thread.
6. The movable screen for screen printing according to claim 1, characterized in that: The screen lifting device includes an electric magnetic sheet, a permanent magnetic sheet and a bearing. The bearing is located at the bottom of the rotating screw. The permanent magnetic sheet is arranged in the bearing. The electric magnetic sheet is arranged at the bottom of the rotating screw. The electric magnetic sheet is arranged opposite to the permanent magnetic sheet. The electric magnetic sheet is connected to an external power supply.
7. The mobile screen for screen printing according to claim 1, characterized in that: The screen lifting device is L-shaped, and the right angle of the screen lifting device is in contact with the right angle outside the screen frame.
8. The mobile screen for screen printing according to claim 1, characterized in that: A T-shaped handle is arranged on one side of the net frame.