Pressing wheel mechanism and drilling and cutting all-in-one machine
By installing a pressing wheel mechanism in the sheet processing equipment, the friction and contact area of the sheet are reduced by using bearings and pressing wheels, the damage and interference problems when the sheet is moved is solved, and the efficiency of the sheet processing is improved.
Patent Information
- Application Number
- CN202422051066.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-22
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-08-22
AI Technical Summary
During the processing of the plate, in the prior art, the friction force of the plate is high when moving, which can easily damage the plate, and the movement is easily disturbed, affecting the processing efficiency.
A pressing wheel mechanism is provided, including a first pressing member, a first support member and a first contact member, which is located on one side of the processing area and has a bearing for contacting the plate and rotating in the direction of movement of the plate. The first pressing member and the first support member are arranged oppositely to form a space for the sheet to move, and the pressure wheel is driven down and pressed by a driver.
By reducing the contact area and friction with the board, avoiding damage to the board and eliminating interference to the board movement, improving the board processing efficiency.
Smart Images

Figure CN222987150U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of sheet processing. Specifically, this application relates to a pressing wheel mechanism and a drilling and cutting integrated machine. Background Art
[0002] Sheet processing is to make wood into standard-sized flat rectangular building material boards, which are applied to the construction industry and the decoration industry, or used in furniture production, etc., and are used as components for walls, ceilings or floors. Sheet processing includes a series of processes such as saw blades, cutting, and grinding. Commonly used sheet processing machinery includes cutting machines, cutting tables, grinding machines, etc.
[0003] During the sheet processing process, the sheet needs to be moved from the non-processing area to the processing area or from the previous processing area to the next processing area. In the prior art, a table with a flat top surface is arranged on the side of the processing area, and the sheet is placed on this flat structure, and the sheet is moved along this flat structure. This moving method is likely to increase the friction between the sheet and the table, resulting in damage to the objects attached to the sheet or the table. Moreover, for the convenience of processing, an opening opposite to the processing area needs to be arranged on the table. When moving, the end of the sheet may contact the side wall of the opening due to its own material or deformation, causing the sheet to be blocked and unable to move, interfering with the processing of the sheet and reducing the sheet processing efficiency. Summary of the Utility Model
[0004] The embodiments of this application provide a pressing wheel mechanism and a drilling and cutting integrated machine, which can solve the problems that the friction is large when the sheet moves, it is easy to damage the sheet, and the movement of the sheet is easily interfered, affecting the sheet processing. To achieve this purpose, the embodiments of this application provide the following several solutions.
[0005] According to one aspect of the embodiments of this application, a pressing wheel mechanism is provided. The pressing wheel mechanism is installed on at least one side of the processing area. The pressing wheel mechanism includes a first component provided with at least one first pressing member, at least one first supporting member, and at least one first contacting member;
[0006] The first contacting member is located on the side of the first supporting member close to the processing area and includes at least one set of bearings. The rotating surface on the outer side of the bearings is used to contact the sheet and rotate along the moving direction of the sheet;
[0007] The first pressing member and the first supporting member are arranged oppositely. A first pressing wheel is provided on the side of the first pressing member facing the first supporting member, and a second pressing wheel is provided on the side of the first supporting member facing the first pressing member. A space for the sheet to move is formed between the first pressing wheel and the second pressing wheel, and the top height of the second pressing wheel is lower than the top height of the bearings;
[0008] The first pressing member includes a driver, a driving end of the driver is connected to the first pressing wheel, and the driver is configured to drive the first pressing wheel to descend and press the to-be-processed plate.
[0009] In a possible implementation, the driver includes a cylinder, and the first pressing member includes a first cylinder mounting seat, a floating joint, and a first pressing wheel fixing plate. The cylinder is mounted on the first cylinder mounting seat, a driving end of the cylinder passes through the first cylinder mounting seat and is connected to the floating joint, an end of the floating joint away from the cylinder is connected to the first pressing wheel fixing plate, and the first pressing wheel is fixed on both sides of the first pressing wheel fixing plate.
[0010] In a possible implementation, the first pressing member further includes a guiding member, the guiding member is fixed on both sides of the driver, and one end of the guiding member is fixed to the first pressing wheel fixing plate and the other end penetrates through the first cylinder mounting seat. The guiding member includes at least one of an optical axis and a linear bearing.
[0011] In a possible implementation, the first assembly further includes a first support frame, and the first support member and the first contact member are fixed to the first support frame;
[0012] The first support member and the first contact member are fixed to the same side of the first support frame.
[0013] In a possible implementation, the number of the first pressing members, the first support members, and the first contact members is the same. The first support members are arranged at intervals on the support member, and the distance between the first contact members corresponds to the distance between the first support members.
[0014] In a possible implementation, the first support member includes a first pressing wheel mounting seat provided with a first mounting plate and a first vertical plate. The first mounting plate is fixed to the first support frame, the first vertical plate is vertically fixed to a side of the first mounting plate away from the first support frame, and the second pressing wheel is fixed to the first vertical plate.
[0015] In a possible implementation, the first contact member further includes a third mounting seat provided with a second mounting plate and a second vertical plate. The second mounting plate is fixed to the support frame, the second vertical plate is vertically fixed to a side of the second mounting plate away from the first support frame, and the bearings are fixed on both sides of the second vertical plate.
[0016] In a possible implementation, a second assembly is further included, and the second assembly and the first assembly are arranged on both sides of the processing area along the movement direction of the plate;
[0017] The second component includes at least one second pressing member, at least one second supporting member, and a first component of at least one second contacting member. The second pressing member is disposed opposite to the second supporting member. The structure of the first contacting member is the same as that of the second contacting member, and the second contacting member is located on the side of the second pressing member close to the first component.
[0018] In a possible implementation, a third pressing wheel is provided on the side of the second pressing member facing the second supporting member, and a fourth pressing wheel is provided on the side of the second supporting member facing the second pressing member. The fourth pressing wheel is disposed opposite to the third pressing wheel.
[0019] According to one aspect of the embodiments of the present application, a drilling and cutting integrated machine is provided. The drilling and cutting integrated machine includes the pressing wheel mechanism as described above.
[0020] The beneficial effects brought by the technical solution provided by the embodiments of the present application are as follows:
[0021] In the pressing wheel mechanism provided by the present application, the first contacting member is located on the side of the first supporting member close to the processing area, and includes at least one set of bearings. The rotating surface on the outer side of the bearings is used to contact the plate and rotate along the moving direction of the plate; the first pressing member and the first supporting member are disposed opposite to each other. A first pressing wheel is provided on the side of the first pressing member facing the second pressing wheel, and a second pressing wheel is provided on the side of the first supporting member facing the first pressing member. A space for the plate to move is formed between the first pressing wheel and the second pressing wheel. The top height of the second pressing wheel is lower than the top height of the bearings; the first pressing member includes a driver, and the driving end of the driver is connected to the first pressing wheel. The driver is used to drive the first pressing wheel to descend and press the plate to be processed. When the plate moves in the embodiments of the present application, the pressing wheel and the bearings are used to contact the plate, reducing the contact area with the plate and the generated frictional force, effectively avoiding the possibility of the plate being damaged by the attached object, and being able to eliminate the interference to the movement of the plate and improve the processing efficiency of the plate. Description of the Drawings
[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required to be used in the description of the embodiments of the present application.
[0023] Figure 1 It is a structural diagram of the pressing wheel mechanism provided by the embodiments of the present application;
[0024] Figure 2 It is a front view of the pressing wheel mechanism provided by the embodiments of the present application;
[0025] Figure 3 It is a side view of the pressing wheel mechanism provided by the embodiments of the present application;
[0026] Figure 4 It is a top view of the pressing wheel mechanism provided by the embodiments of the present application;
[0027] Figure 5 The structural diagram of the drilling and cutting integrated machine provided by the embodiment of the present application.
[0028] Label description: 111, the first cylinder mounting seat; 112, the optical axis; 113, the linear bearing; 114, the cylinder; 115, the first pressing wheel fixing plate; 116, the floating joint; 117, the first pressing wheel.
[0029] 121, the second pressing wheel; 122, the first mounting plate; 123, the first vertical plate; 131, the bearing; 132, the second vertical plate; 14, the first support frame.
[0030] 211, the second cylinder mounting seat; 212, the third pressing wheel; 221, the fourth pressing wheel; 23, the second contact member; 24, the second support frame. Detailed implementation manners
[0031] The embodiments of the present application will be described below with reference to the accompanying drawings in the present application. It should be understood that the embodiments described below in conjunction with the accompanying drawings are exemplary descriptions for explaining the technical solutions of the embodiments of the present application, and do not constitute limitations on the technical solutions of the embodiments of the present application.
[0032] Those skilled in the art of the present technology can understand that, unless specifically stated otherwise, the singular forms "a", "an", "the" and "said" used herein may also include the plural forms. It should be further understood that the terms "including" and "comprising" used in the embodiments of the present application mean that the corresponding features can be implemented as the presented features, information, data, steps, operations, elements and / or components, but do not exclude being implemented as other features, information, data, steps, operations, elements, components and / or their combinations supported by the art of the present technology. It should be understood that when we say an element is "connected" or "coupled" to another element, the one element can be directly connected or coupled to the other element, or it can mean that the one element and the other element establish a connection relationship through an intermediate element. In addition, the "connection" or "coupling" used here can include wireless connection or wireless coupling. The term "and / or" used here indicates at least one of the items defined by the term, for example, "A and / or B" indicates being implemented as "A", or being implemented as "B", or being implemented as "A and B".
[0033] To make the purpose, technical solutions and advantages of the present utility model clearer, the embodiments of the present utility model will be further described in detail below with reference to the accompanying drawings.
[0034] The technical solutions of the embodiments of the present utility model and the technical effects produced by the technical solutions of the present utility model will be described below through the description of several exemplary embodiments. It should be noted that the following embodiments can be referred to, learned from, or combined with each other. For the same terms, similar features, and similar implementation steps in different embodiments, they will not be described repeatedly.
[0035] The pressing wheel mechanism and the drilling and cutting integrated machine provided in the present application aim to solve at least one technical problem existing in the prior art.
[0036] In an embodiment of the present application, a pressing wheel mechanism is provided. As Figures 1 - 4 shown, the pressing wheel mechanism is installed on at least one side of the processing area. The pressing wheel mechanism includes a first component provided with at least one first pressing member, at least one first supporting member, and at least one first contacting member; the first contacting member is located on the side of the first supporting member close to the processing area and includes at least one set of bearings 131. The rotating surface on the outer side of the bearings 131 is used to contact the plate and rotate along the moving direction of the plate; the first pressing member and the first supporting member are arranged opposite to each other. A first pressing wheel 117 is provided on the first pressing member facing the second pressing wheel 121, and a second pressing wheel 121 is provided on the first supporting member facing the first pressing member. A space for the plate to move is formed between the first pressing wheel 117 and the second pressing wheel 121. The top height of the second pressing wheel 121 is lower than the top height of the bearings 131; the first pressing member includes a driver, and the driving end of the driver is connected to the first pressing wheel 117. The driver is used to drive the first pressing wheel 117 to descend and press the plate to be processed.
[0037] In one embodiment, the pressing wheel mechanism can be installed on a drilling and cutting integrated machine. Specifically, the processing area is a drilling and grooving area. The drilling and grooving mechanism for drilling and grooving is arranged above and below the drilling and grooving area. When the plate to be processed passes through the drilling and grooving area and the equipment for drilling and grooving the plate is located in the drilling and grooving area, the plate is fixed by the pressing wheel mechanism to facilitate processing the plate. Among them, the drilling and cutting integrated machine can also include a blanking mechanism. After drilling and grooving the plate, the plate is transported to the blanking area of the blanking mechanism, and the blanking operation is performed using the blanking mechanism.
[0038] Optionally, the bearing 131 can be a deep groove ball bearing, and the deep groove ball bearing can be fixed to the first contacting member through a rotating shaft.
[0039] Optionally, the driver includes a cylinder 114, the first pressing member includes a first cylinder mounting seat 111, a floating joint 116, and a first pressing wheel fixing plate 115. The cylinder 114 is mounted on the first cylinder mounting seat 111. The driving end of the cylinder 114 passes through the first cylinder mounting seat 111 and is connected to the floating joint 116. The end of the floating joint 116 away from the cylinder 114 is connected to the first pressing wheel fixing plate 115. The first pressing wheels 117 are fixed on both sides of the first pressing wheel fixing plate 115.
[0040] Optionally, the first cylinder mounting seat 111 may include a bottom plate. The cylinder 114 is fixed on the bottom plate, and the driving end of the cylinder 114 passes through the bottom plate and is connected to the floating joint 116.
[0041] Optionally, the first pressing wheels 117 are rotatably fixed on both sides of the first pressing wheel fixing plate 115. Among them, the first pressing wheels 117 can be rotatably fixed on both sides of the first pressing wheel fixing plate 115 through a long and short sleeve or other shaft bodies.
[0042] Optionally, to ensure that the first pressing wheels 117 move in a fixed direction, the first pressing member further includes a guiding member. The guiding member is fixed on both sides of the driver, and one end of the guiding member is fixed to the first pressing wheel fixing plate 115, and the other end penetrates through the first cylinder mounting seat 111. The guiding member includes at least one of a optical axis 112 and a linear bearing 113.
[0043] In one embodiment, the guiding member includes an optical axis 112 and a linear bearing 113, and the optical axis 112 and the linear bearing 113 are arranged on different sides of the driver.
[0044] Optionally, the first pressing member is fixed above the first support member. The pressing wheel mechanism may further include a gantry frame provided with columns and a cross beam. Both ends of the cross beam are fixed to the tops of the columns. The first cylinder mounting seat 111 can be fixed on the cross beam of the gantry frame, and the first pressing member is fixed to the gantry frame through the first cylinder mounting seat 111.
[0045] Optionally, the first assembly further includes a first support frame 14, and the first support member and the first contact member are fixed to the first support frame 14; the first support member and the first contact member are fixed to the same side of the first support frame 14.
[0046] Optionally, the first support frame 14 is horizontally disposed on the moving path of the sheet. The first support frame 14 may include a first support beam, and the first support beam is horizontally placed. The first support member and the first contact member are installed on the top of the first support beam. Among them, to provide an installation space, a flat plate may be provided at the top of the first support beam corresponding to the positions where the first support member and the first contact member are located, and the first support member and the first contact member are installed on the flat plate.
[0047] Optionally, the number of the first pressing members, the first supporting members, and the first contacting members is the same. The first supporting members are arranged at intervals on the supporting member, and the distance between the first contacting members corresponds to the distance between the first supporting members.
[0048] In one embodiment, the number of the first pressing members, the first supporting members, and the first contacting members is all 3. And the first pressing members and the first supporting members are arranged in one-to-one correspondence.
[0049] Optionally, the first supporting member includes a first pressing wheel mounting seat provided with a first mounting plate 122 and a first vertical plate 123. The first mounting plate 122 is fixed to the first supporting frame 14, the first vertical plate 123 is vertically fixed to the side of the first mounting plate 122 away from the first supporting frame 14, and the second pressing wheel 121 is fixed to the first vertical plate 123. The shape of the first vertical plate 123 can be the same as the plate structure on the first pressing wheel fixing plate 115, and the way the first pressing wheel 117 is fixed on the plate can also be the same as the way the second pressing wheel 121 is fixed on the first vertical plate 123.
[0050] Optionally, in order to effectively support the first pressing wheel mounting seat, the first supporting frame 14 further includes a first support plate. One side of the first support plate is fixed to the side of the first mounting plate 122 away from the first pressing wheel fixing plate 115, and the first support plate is vertically fixed to the side surface of the first support beam.
[0051] Optionally, the first contacting member further includes a third mounting seat provided with a second mounting plate and a second vertical plate 132. The second mounting plate is fixed to the first supporting frame 14, the second vertical plate 132 is vertically fixed to the side of the second mounting plate away from the first supporting frame 14, and the bearing 131 is fixed to both sides of the second vertical plate 132.
[0052] Optionally, bearings 131 are provided at both ends of the second vertical plate 132. Taking the bearings 131 on one second vertical plate 132 as a group, two groups of bearings 131 are provided on each second mounting plate.
[0053] Optionally, the first supporting frame 14 may further include a second support plate. The second support plate is fixed to the back of the second mounting plate, and the second support plate is vertically fixed to the side surface of the first support beam. The first support plate and the second support plate are fixed to the opposite sides of the first support beam.
[0054] Optionally, the pressing wheel mechanism further includes a second component. The second component and the first component are arranged on both sides of the processing area along the movement direction of the sheet; the second component includes at least one second pressing member, at least one second supporting member, and at least one second contacting member 23 of the first component. The second pressing member and the second supporting member are arranged oppositely. The structure of the first contacting member is the same as the structure of the second contacting member 23, and the second contacting member 23 is located on the side of the second pressing member close to the first component. Among them, the first contacting member and the second contacting member 23 are symmetrically arranged.
[0055] Optionally, the second component also includes a second support frame 24, the second support frame 24 includes a second support beam and a third vertical plate, the first support beam and the second support beam are arranged in parallel, the second support member and the second contact member 23 are installed on the top of the second support beam, the third vertical plate is vertically fixed to the side of the second support beam, and one side is connected to the side of the second contact member 23 away from the second pressing member.
[0056] Optionally, the second pressing member is provided with a third pressing wheel 212 on the side facing the second supporting member, and the second supporting member is provided with a fourth pressing wheel 221 on the side facing the second pressing member, and the fourth pressing wheel 221 is arranged opposite to the third pressing wheel 212. The second supporting member has the same structure as the first supporting member.
[0057] Optionally, the second pressing member has a similar structure to that of the first pressing member, and is also provided with a driver and a guide member, and the structure for fixing the third pressing wheel 212 is also the same as the structure of the first pressing wheel fixing plate 115 for fixing the first pressing wheel 117 in the first pressing member, and the driver is a cylinder 114, and the cylinder 114 is fixed to the second cylinder mounting seat 211. The structure of the second cylinder mounting seat 211 is different from that of the first cylinder mounting seat 111, and the arrangement direction of the guide member and the driver on the second cylinder mounting seat 211 is different from that of the guide member and the driver on the first cylinder mounting seat 111.
[0058] In the pressure wheel mechanism of the embodiment of the present application, the first contact member is located on the side of the first support member close to the processing area, and includes at least one group of bearings, and the rotating surface on the outer side of the bearing is used to contact the plate and rotate along the movement direction of the plate; the first pressing member and the first support member are arranged oppositely, and the first pressing member is provided with a first pressing wheel on the side facing the second pressing wheel, and the first support member is provided with a second pressing wheel on the side facing the first pressing member, and a space for the plate to move is formed between the first pressing wheel and the second pressing wheel, and the top height of the second pressing wheel is lower than the top height of the bearing; the first pressing member includes a driver, and the driving end of the driver is connected to the first pressing wheel, and the driver is used to drive the first pressing wheel to descend and press the plate to be processed. When the plate moves, the embodiment of the present application uses the pressing wheel and the bearing to contact the plate, reduce the contact area with the plate and reduce the friction generated, effectively avoid the possibility of the plate being damaged by the attached object, and can eliminate interference with the movement of the plate, thereby improving the plate processing efficiency.
[0059] According to one aspect of the embodiment of the present application, a drilling and cutting machine is also provided. Figure 5 As shown, the drilling and cutting machine includes the pressure wheel mechanism as described in the above embodiment.
[0060] Optionally, the drilling and cutting machine includes a work surface, a drilling and grooving mechanism and a cutting mechanism, wherein the pressure wheel mechanism is installed in the drilling and grooving area of the work surface, and the drilling and grooving end of the drilling and grooving mechanism is opposite to the drilling and grooving area.
[0061] The terms "first", "second", "third", "fourth", "1", "2", etc. (if any) in the description, claims and the above-mentioned drawings of this application are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of this application described here can be implemented in an order other than that shown or described in words.
[0062] It should be understood that although the flowchart of the embodiments of this application indicates each operation step by an arrow, the execution order of these steps is not limited to the order indicated by the arrow. Unless there is a clear description in this article, in some implementation scenarios of the embodiments of this application, the implementation steps in each flowchart can be executed in other orders according to requirements. In addition, some or all of the steps in each flowchart may include multiple sub-steps or multiple stages based on the actual implementation scenario. Some or all of these sub-steps or stages can be executed at the same time, and each sub-step or stage among these sub-steps or stages can also be executed at different times respectively. In the scenario where the execution times are different, the execution order of these sub-steps or stages can be flexibly configured according to requirements, and the embodiments of this application do not limit this.
[0063] The above are only optional implementation manners of some implementation scenarios of this application. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical concept of the solution of this application, adopting other similar implementation means based on the technical idea of this application also belongs to the protection scope of the embodiments of this application.
Claims
1. A pressing wheel mechanism, characterized in that: The pressing wheel mechanism is installed on at least one side of the processing area, and the pressing wheel mechanism includes a first component including at least one first pressing member, at least one first supporting member and at least one first contact member; The first contact member is located on the side of the first support member close to the processing area, and includes at least one set of bearings, and the outer rotating surface of the bearing is used to contact the plate and rotate along the moving direction of the plate; The first pressing member and the first supporting member are arranged opposite to each other, a first pressing wheel is provided on the side of the first pressing member facing the first supporting member, and a second pressing wheel is provided on the side of the first supporting member facing the first pressing member, a space for the plate to move is formed between the first pressing wheel and the second pressing wheel, and a top height of the second pressing wheel is lower than a top height of the bearing; The first pressing member includes a driver, a driving end of the driver is connected to the first pressing wheel, and the driver is used to drive the first pressing wheel to descend and press the plate to be processed.
2. The pressing wheel mechanism according to claim 1, characterized in that: The driver includes a cylinder, and the first pressing member includes a first cylinder mounting seat, a floating joint, and a first pressure wheel fixing plate. The cylinder is mounted on the first cylinder mounting seat, and the driving end of the cylinder passes through the first cylinder mounting seat and is connected to the floating joint. The end of the floating joint away from the cylinder is connected to the first pressure wheel fixing plate, and the first pressure wheel is fixed on both sides of the first pressure wheel fixing plate.
3. The pressing wheel mechanism according to claim 2, characterized in that: The first pressing member also includes a guide member, which is fixed on both sides of the driver, and one end of the guide member is fixed to the first pressure wheel fixing plate, and the other end passes through the first cylinder mounting seat, and the guide member includes at least one of an optical axis and a linear bearing.
4. The pressing wheel mechanism according to claim 1, characterized in that: The first assembly further comprises a first support frame, and the first support member and the first contact member are fixed to the first support frame; The first supporting member and the first contact member are fixed to the same side of the first supporting frame.
5. The pressing wheel mechanism according to claim 4, characterized in that: The number of the first pressing members, the first supporting members and the first contact members is the same, the first supporting members are arranged on the supporting member at intervals, and the distance between the first contact members corresponds to the distance between the first supporting members.
6. The pressing wheel mechanism according to claim 4, characterized in that: The first support member includes a first pressure wheel mounting seat provided with a first mounting plate and a first vertical plate, the first mounting plate is fixed to the first support frame, the first vertical plate is vertically fixed to the side of the first mounting plate away from the first support frame, and the second pressure wheel is fixed to the first vertical plate.
7. The pressing wheel mechanism according to claim 4, characterized in that: The first contact member also includes a third mounting seat provided with a second mounting plate and a second vertical plate, the second mounting plate is fixed to the support frame, the second vertical plate is vertically fixed to the side of the second mounting plate away from the first support frame, and the bearings are fixed on both sides of the second vertical plate.
8. The pressing wheel mechanism according to claim 1, characterized in that: It also includes a second component, wherein the second component and the first component are arranged on both sides of the processing area along the moving direction of the plate; The second component includes a first component of at least one second pressing member, at least one second supporting member and at least one second contact member, the second pressing member is arranged opposite to the second supporting member, the structure of the first contact member is the same as that of the second contact member, and the second contact member is located on the side of the second pressing member close to the first component.
9. The pressing wheel mechanism according to claim 8, characterized in that: A third pressing wheel is disposed on the side of the second pressing member facing the second supporting member, and a fourth pressing wheel is disposed on the side of the second supporting member facing the second pressing member. The fourth pressing wheel is arranged opposite to the third pressing wheel.
10. A drilling and cutting machine, characterized in that: The drilling and cutting machine includes the pressure wheel mechanism as described in any one of claims 1-9.