Pole piece rolling device

Abstract

The utility model belongs to the technical field of battery production, and particularly relates to a pole piece rolling device which comprises a first rolling mechanism and a second rolling mechanism, the first rolling mechanism and the second rolling mechanism are arranged side by side, and the first rolling mechanism and the second rolling mechanism form a rolling structure; at least one first scribing component is arranged on the first rolling mechanism; at least one second scribing component is arranged on the second rolling mechanism; the projection, facing the first rolling mechanism, of the second lineation component and the first lineation component are arranged in a staggered mode. According to the utility model, the loss material quantity of the whole capacity of the pole piece body can be reduced, the operation stability and the processing efficiency are improved, and the rate capability of a battery cell is optimized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the battery production technical field especially relates to a pole piece roll device. BACKGROUND

[0002] At present, the demand of client to the energy density of the battery is increasing, and thick coating is the most direct means to increase the capacity of the battery. Under the condition of certain thickness specification of the battery, the coating surface density is increased, and the compaction density of the pole piece needs to be improved synchronously, and the close stacking between particles will cause the difficulty of electrolyte infiltration, the decline of ion transmission performance and the attenuation of the rate performance of the battery, and the optimization of the rate performance of thick electrode is the only way for the development of high energy density battery.

[0003] However, etching on the surface of the pole piece to promote the infiltration of electrolyte is a more direct and simple means. At present, the laser etching is mainly used to punch or scribe lines on the surface of the pole piece to artificially manufacture efficient ion transmission channels. However, the loss of the pole piece material in the laser etching part is irreversible, and the operation is complex, so as to increase the production and processing cost, and the processing efficiency is low. UTILITY MODEL CONTENT

[0004] The utility model aims at the shortage of prior art, and provides a pole piece roll device, which can solve the technical problem of low processing efficiency of prior art.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A pole piece roll device, comprising a first roll mechanism and a second roll mechanism; the first roll mechanism and the second roll mechanism are arranged side by side, and the first roll mechanism and the second roll mechanism form a roll structure; and at least one first scribing part is arranged on the first roll mechanism; at least one second scribing part is arranged on the second roll mechanism; the projection of the second scribing part towards the first roll mechanism is arranged in a staggered manner with the first scribing part; and the scribing direction of the first scribing part is the same as the conveying direction; the scribing direction of the second scribing part is the same as the conveying direction.

[0007] Preferably, the first roll mechanism comprises a first roller and a first rotating part connected to one side end of the first roller; all the first scribing parts are arranged on the outer surface of the first roller;

[0008] And / or, the second roll mechanism comprises a second roller and a second rotating part connected to one side end of the second roller; all the second scribing parts are arranged on the outer surface of the second roller.

[0009] Preferably, the width D1 of the first scribing part satisfies: 50um≤D1≤150um;

[0010] and / or, the height H1 of the first scribe component satisfies: 0um≤H1≤30um;

[0011] and / or, the distance L1 between two adjacent first scribe components satisfies: 1mm≤L1≤10mm.

[0012] Preferably, the width D2 of the second scribe component satisfies: 50um≤D2≤150um;

[0013] and / or, the height H2 of the second scribe component satisfies: 0um≤H2≤30um;

[0014] and / or, the distance L2 between two adjacent second scribe components satisfies: 1mm≤L2≤10mm.

[0015] Preferably, the first scribe component is connected to the outer surface of the first roller and protrudes outwardly from the outer surface of the first roller;

[0016] and / or, the second scribe component is connected to the outer surface of the second roller and protrudes outwardly from the outer surface of the second roller.

[0017] Preferably, the pole piece rolling device further comprises a dust collection mechanism and a pre-heating mechanism; the pre-heating mechanism, the rolling structure and the dust collection mechanism are sequentially arranged along the conveying direction of the pole piece body.

[0018] Preferably, the pre-heating mechanism comprises a first heating assembly and a second heating assembly arranged side by side; a pre-heating area is arranged between the first heating assembly and the second heating assembly, and the pre-heating area is arranged in the conveying direction.

[0019] The first heating assembly and the second heating assembly each comprise a first housing, a blowing component and at least one heating pipe; the first housing is provided with a heating cavity, the blowing component is connected to the first housing, and the blowing end of the blowing component is in communication with the inlet of the heating cavity; the heating pipe is connected to the first housing, and the heating pipe is arranged in the conveying direction.

[0020] Preferably, the dust collection mechanism comprises a dust collection pipe, a guide pipe, a dust collection fan and a recovery container; the input end of the dust collection pipe is arranged towards the pole piece body; the input end of the guide pipe is in communication with the output end of the dust collection pipe; the output end of the guide pipe is in communication with the input end of the dust collection fan; and the output end of the dust collection fan is in communication with the interior of the recovery container.

[0021] Preferably, the pole piece rolling device further comprises at least two brush cleaning mechanisms, one of the brush cleaning mechanisms is connected with the first rolling mechanism, and the other brush cleaning mechanism is connected with the second rolling mechanism.

[0022] Preferably, the brush cleaning mechanism comprises a rotating cylinder, a brush cleaning part and a driving motor, the driving motor is drivingly connected with one end of the rotating cylinder, the brush cleaning part is connected to the outer surface of the rotating cylinder, and the brush cleaning part is connected with the first rolling mechanism or the second rolling mechanism.

[0023] The utility model discloses the beneficial effect lies in, the first rolling mechanism and its first scribe part and the second rolling mechanism and its second scribe part of the upper and lower side -by -side arrangement of this technical scheme are to realize the synchronous scribe in the pole piece body rolling process, compared with the etching of the pole piece in traditional craft, and the rolling scribe is extruded to the material area at the scribe part, and the loss of the whole electrode is less, thereby can effectively reduce the material loss amount of the pole piece body whole, is favorable for subsequent in the enhancement electrode core ratio performance while reserving more capacity play material, reduces the slurry input cost, on the other hand, the rolling scribe replaces the etching, can omit the subsequent etching procedure, shortens the technological process, and the loss material amount of the whole capacity of the pole piece body is reduced, and the processing efficiency of the pole piece is improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] The features, advantages, and technical effects of the exemplary embodiments of the utility model will be described below with reference to the accompanying drawings. Figures 1-7

[0025] Figure 1 It is the structure schematic drawing of pole piece rolling device of an embodiment of the utility model;

[0026] Figure 2 It is the structure schematic drawing of the rolling scribe mechanism of pole piece rolling device of an embodiment of the utility model;

[0027] Figure 3 It is the structure schematic drawing of the rolling scribe mechanism of pole piece rolling device of an embodiment of the utility model;

[0028] Figure 4 It is the structure schematic drawing of preheating mechanism of pole piece rolling device of an embodiment of the utility model;

[0029] Figure 5 It is the structure schematic drawing of brush cleaning mechanism of pole piece rolling device of an embodiment of the utility model;

[0030] Figure 6 It is the local enlarged view of brush cleaning mechanism of pole piece rolling device of an embodiment of the utility model;

[0031] ​Figure 7 It is the structural schematic view of the dust collection mechanism of the pole piece rolling device of an embodiment of the utility model.

[0032] In the drawing: 100 - first rolling mechanism;101 - first line marking component;110 - first rotating part;120 - first roller;200 - second rolling mechanism;201 - second line marking component;210 - second rotating part;220 - second roller;300 - preheating mechanism;310 - first heating assembly;320 - second heating assembly;301 - first shell;302 - heating cavity;303 - air blowing component;304 - heating pipe;400 - brush cleaning mechanism;410 - second shell;420 - rotating cylinder;430 - brush component;431 - mounting seat;432 - brush body;433 - mounting block;434 - bristles;435 - suction accessory;440 - driving motor;500 - dust collection mechanism;510 - dust collection pipe;520 - third shell;530 - guide pipe;540 - dust collection fan;550 - recovery container;6 - pole piece body;A - conveying direction. DETAILED DESCRIPTION

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the description and claims of this application as well as the above description of the drawings herein are not inclusive of all of the features of the application, and are subject to change and modification.

[0034] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0035] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0036] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can mean that A exists alone, A and B exist together, and multiple cases exist alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are "or" relationship.

[0037] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and other terms should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanical connection, or it can be electrical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0038] The following will be described in detail in combination with the accompanying drawings Figures 1-7 The present application will be described in further detail, but not as a limitation on the present application.

[0039] As shown in Figure 1 And 2 As shown in an embodiment of the present application, the pole piece rolling device; comprising a first rolling mechanism 100 and a second rolling mechanism 200; the first rolling mechanism 100 and the second rolling mechanism 200 are arranged side by side, and the first rolling mechanism 100 and the second rolling mechanism 200 form a rolling structure; and at least one first scribing component 101 is arranged on the first rolling mechanism 100; at least one second scribing component 201 is arranged on the second rolling mechanism 200; the projection of the second scribing component 201 towards the first rolling mechanism 100 is arranged in a staggered manner with the first scribing component 101; and the scribing direction of the first scribing component 101 is the same as the conveying direction; the scribing direction of the second scribing component 201 is the same as the conveying direction A of the pole piece body 6.

[0040] The technical scheme of the present application realizes synchronous scribing during the rolling process of the pole piece body through the first rolling mechanism and its first scribing component and the second rolling mechanism and its second scribing component arranged side by side. Compared with etching the pole piece in the traditional process, the rolling scribing is to extrude the material area at the scribing component, which has less loss to the whole electrode, thereby effectively reducing the material loss amount of the whole pole piece body, which is beneficial to subsequent improvement of the cell rate performance while retaining more capacity to play the material, reducing the slurry input cost. On the other hand, the rolling scribing replaces the etching, which can omit the subsequent etching process, shorten the process flow, and reduce the material loss amount of the whole capacity of the pole piece body, thereby improving the processing efficiency of the pole piece.

[0041] Specifically, in some embodiments, as shown inFigure 1 and 2 As shown, the first roller pressing mechanism 100 includes a first roller 120 and a first rotating member 110 connected to one side of the first roller 120; all first scribing components 101 are disposed on the outer surface of the first roller 120. The first rotating member 110 can be a first rotating metal shaft, on which a first rotating wheel is mounted, and the first rotating wheel is driven by a first motor. Further, as... Figure 2 As shown, the first scribing component 101 is connected to the outer surface of the first roller 120, and the first scribing component 101 extends outward from the outer surface of the first roller 120 (the outward extension can be in the direction of extending from the outer surface of the first roller 120 toward the second rolling mechanism 200). Furthermore, the first scribing component 101 can be selected with edges having a frustum, rectangle, or triangle cross-section. This structure performs rolling and scribing operations on the side surface of the electrode body through the edges, thereby reducing the overall material loss of the electrode body, improving operational stability and processing efficiency, and also facilitating the optimization of the cell rate performance.

[0042] Specifically, in some implementations, such as Figure 2 and 3 As shown, the width D1 of the first scribing component 101 satisfies: 50um ≤ D1 ≤ 150um; where D1 can be 50um, 60um, 70um, 75um, 140um, 150um, etc. The height H1 of the first scribing component 101 satisfies: 0um ≤ H1 ≤ 30um; where H1 can be 0um, 15um, 18um, 25um, 28um, 30um, etc. The distance L1 between two adjacent first scribing components 101 satisfies: 1mm ≤ L1 ≤ 10mm; where L1 can be 1mm, 3mm, 4mm, 5.5mm, 6mm, 10mm, etc. This structure uses the edge as the first scribing component 101, and satisfies the following requirements: edge spacing 1-10mm, edge height 10-30um, and edge width 50-150um, so as to achieve edge extrusion on the first roller. The electrode is scribing is achieved at the same time as the roller pressing. By squeezing the material area at the edge position to the edge, the overall loss of the electrode is reduced. It also achieves the characteristics of low-cost and rapid production of high-ratio electrodes.

[0043] Specifically, in some implementations, such as Figure 1 and 2 As shown, the second roller pressing mechanism 200 includes a second roller 220 and a second rotating member 210 connected to one side of the second roller 220; all second scribing components 201 are disposed on the outer surface of the second roller 220. The second rotating member 210 can be a second rotating metal shaft, on which a second rotating wheel is mounted, and the second rotating wheel is driven by a second motor. Further, as...Figure 2 As shown in the drawings, the second scribing member 201 is arranged around the outer surface of the second roller 220, and the second scribing member 201 is arranged protruding outward from the outer surface of the second roller 220 (outward can be the direction extending from the outer surface of the second roller 220 towards the first roller 120 in the first roller pressing mechanism 100). Further, the second scribing member 201 can be selected to have a cross section of a circular truncated cone or a rectangle or a triangle. This structure performs the roller pressing and scribing operation on the side surface of the pole piece body through the edge, thereby reducing the amount of waste material of the whole pole piece body, improving the stability and processing efficiency of the operation, and facilitating the optimization of the rate capability of the battery cell.

[0044] Specifically, in some embodiments, as shown in Figure 2 and 3 The width D2 of the second scribing member 201 satisfies: 50um≤D2≤150um; wherein D2 can be 50um, 60um, 70um, 75um, 140um, 150um, etc. The height H2 of the second scribing member 201 satisfies: 0um≤H2≤30um; wherein H2 can be 0um, 15um, 18um, 25um, 28um, 30um, etc. The distance L2 between adjacent two second scribing members 201 satisfies: 1mm≤L2≤10mm; wherein L1 can be 1mm, 3mm, 4mm, 5.5mm, 6mm, 10mm, etc. This structure uses the edge as the first scribing member 101, and satisfies the edge distance 1-10mm, the edge height 10-30um, and the edge width 50-150um, to realize the edge extrusion on the second roller, to realize the pole piece scribing while rolling, so as to extrude the edge position material area to the edge, and the loss of the whole electrode is small; and the characteristics of low-cost and rapid production of high-rate electrodes are realized.

[0045] Specifically, in some embodiments, as shown in Figure 1 The pole piece rolling device further comprises a dust suction mechanism and a pre-heating mechanism; the pre-heating mechanism, the rolling structure and the dust suction mechanism are sequentially arranged along the conveying direction of the pole piece body. This structure realizes the pre-heating treatment of the pole piece body before rolling and scribing through the pre-heating mechanism, and realizes the roller pressing and scribing operation on the upper and lower side surfaces of the pole piece body in combination with the first roller pressing mechanism and the first scribing member thereof and the second roller pressing mechanism and the second scribing member thereof arranged side by side; and the dust suction mechanism can quickly adsorb and discharge the generated dust, improving the cleanliness of the device.

[0046] Specifically, in some embodiments, as shown in Figure 1As shown, the preheating mechanism 300 includes a first heating assembly 310 and a second heating assembly 320 arranged side by side; a preheating area is provided between the first heating assembly 310 and the second heating assembly 320, and the preheating area is arranged in the conveying direction A of the pole piece body 6. In some embodiments, as shown in Figure 1 and 4 As shown, the first heating assembly 310 and the second heating assembly 320 each include a first shell 301, a blowing component 303, and at least one heating pipe 304; the first shell 301 is provided with a heating cavity 302, the blowing component 303 is connected to the first shell 301, and the blowing end of the blowing component 303 is in communication with the inlet of the heating cavity 302; the heating pipe 304 is connected to the first shell 301, and the heating pipe 304 is arranged in the conveying direction A of the pole piece body 6. Further, the blowing component 303 is a blowing fan or the like. This structure accelerates the discharge of the hot air flow formed by the heating pipe 304 through the blowing component 303, thereby improving the rapidity of preheating and improving the processing efficiency.

[0047] Specifically, in some embodiments, as shown in Figure 4 The projection of the heating pipe 304 in the first heating assembly 310 towards the second heating assembly 320 is arranged in a staggered manner with the heating pipe 304 in the second heating assembly 320. This structure avoids the overheating of the same vertical area due to the staggered arrangement of the heating pipes 304 on both sides, thereby ensuring the rapidity of preheating and improving the stability of processing.

[0048] Specifically, in some embodiments, as shown in Figure 1 and 7 As shown, the dust collection mechanism 500 includes a dust collection pipe 510, a third shell 520, a guide pipe 530, a dust collection fan 540, and a recovery container 550; the dust collection pipe 510 is connected to the third shell 520, and the input end of the dust collection pipe 510 is arranged towards the pole piece body 6; the guide pipe 530 is connected to the third shell 520, and the input end of the guide pipe 530 is in communication with the output end of the dust collection pipe 510; the output end of the guide pipe 530 is in communication with the input end of the dust collection fan 540; the dust collection fan 540 is connected to the third shell 520; the output end of the dust collection fan 540 is in communication with the interior of the recovery container 550; and the recovery container 550 is connected to the third shell 520. In some embodiments, the angle between the dust collection pipe 510 and the horizontal plane in which the conveying direction A is located is α, and α satisfies: 15°≤α≤45°. This structure can quickly absorb and discharge the generated dust through the dust collection pipe 510 with a small acute angle, thereby improving the cleanliness of the device.

[0049] Specifically, in some embodiments, as shown in Figure 1As shown in the drawings, the pole piece rolling device further comprises at least two brush cleaning mechanisms 400, one of which is in contact with the first rolling mechanism 100, and the other of which is in contact with the second rolling mechanism 200. This structure can prolong the service life of the first rolling mechanism and the second rolling mechanism by respectively scrubbing the first rolling mechanism 100 and the second rolling mechanism 200 with the at least two brush cleaning mechanisms 400, and can improve the stability and efficiency of the operation by causing the surface material area of the first rolling mechanism and the first scribing component thereof and the surface material area of the second rolling mechanism and the second scribing component thereof to fall off dust. As shown in Figure 1 and 5 As shown in the drawings, the brush cleaning mechanism 400 comprises a second housing 410, a rotating cylinder 420, a brush component 430, and a driving motor 440. The rotating cylinder 420 is rotatably connected to the second housing 410. The driving motor 440 is connected to the second housing 410 and is in driving connection with one end of the rotating cylinder 420. The brush component 430 is connected to the outer surface of the rotating cylinder 420, and the brush component 430 is in contact with the first rolling mechanism 100 or the second rolling mechanism 200. The rotating direction of the rotating cylinder 420 is opposite to the rotating direction of the first rolling mechanism 100 or the second rolling mechanism 200, so as to improve the scrubbing speed. As shown in Figure 5 As shown in the drawings, the brush component 430 comprises a mounting seat 431 and a brush body 432. The mounting seat 431 is connected around (sleeved on) the outer surface of the rotating cylinder 420. The brush body 432 is connected to the outer surface of the mounting seat 431 away from the rotating cylinder 420. As shown in Figure 5 and 6 As shown in the drawings, the brush body 432 comprises a mounting block 433, a brush 434, and a suction accessory 435. The mounting block 433 is connected to the mounting seat 431. The brush 434 is connected to the mounting block 433, and one side end of the brush 434 extends towards the first rolling mechanism 100 or the second rolling mechanism 200. The suction accessory 435 is connected to the side surface of the brush 434. Preferably, the suction accessory 435 is selected from gauze soaked in natural water. This structure can improve the scrubbing and cleaning efficiency by the scrubbing of the brush 434 and the adsorption of the suction accessory 435 to the falling dust.

[0050] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution. The description of the specification is only for the sake of clarity, and the skilled person should understand the specification as a whole. The technical solutions in each embodiment can be combined appropriately to form other embodiments that can be understood by the skilled person.

[0051] According to the disclosure and teaching of the above description, the person skilled in the art of the present application can also change and modify the above embodiments. Therefore, the present application is not limited to the above specific embodiments, and any obvious improvement, replacement or modification made by the person skilled in the art on the basis of the present application belongs to the protection scope of the present application. In addition, although some specific terms are used in the specification, these terms are only for convenience of description and do not constitute any limitation on the present application.

Claims

1. An electrode rolling device, characterized in that: It includes a first roller pressing mechanism and a second roller pressing mechanism; the first roller pressing mechanism and the second roller pressing mechanism are arranged side by side, and the first roller pressing mechanism and the second roller pressing mechanism form a roller pressing structure; and the first roller pressing mechanism is provided with at least one first scribing component; the second roller pressing mechanism is provided with at least one second scribing component; the projection of the second scribing component toward the first roller pressing mechanism is offset from that of the first scribing component.

2. The electrode rolling device according to claim 1, characterized in that: The first rolling mechanism includes a first roller and a first rotating member connected to one side of the first roller; all the first scribing components are disposed on the outer surface of the first roller; And / or, the second rolling mechanism includes a second roller and a second rotating member connected to one side of the second roller; all the second scribing components are disposed on the outer surface of the second roller.

3. The electrode rolling device according to claim 2, characterized in that: The width D1 of the first scribing component satisfies: 50um≤D1≤150um; And / or, the height H1 of the first scribing component satisfies: 0um≤H1≤30um; And / or, the distance L1 between two adjacent first scribing components satisfies: 1mm≤L1≤10mm.

4. The electrode rolling device according to claim 2, characterized in that: The width D2 of the second scribing component satisfies: 50um ≤ D2 ≤ 150um; And / or, the height H2 of the second scribing component satisfies: 0um≤H2≤30um; And / or, the distance L2 between two adjacent second scribing components satisfies: 1mm≤L2≤10mm.

5. The electrode rolling device according to claim 2, 3, or 4, characterized in that: The first scribing component is connected to the outer surface of the first roller, and the first scribing component extends outward from the outer surface of the first roller. And / or, the second scribing member is connected to the outer surface of the second roller around it, and the second scribing member extends outward from the outer surface of the second roller.

6. The electrode rolling device according to claim 1, characterized in that: The electrode rolling device further includes a dust extraction mechanism and a preheating mechanism; the preheating mechanism, the rolling structure, and the dust extraction mechanism are arranged sequentially along the conveying direction of the electrode body.

7. The electrode rolling device according to claim 6, characterized in that: The preheating mechanism includes a first heating component and a second heating component arranged side by side; a preheating area is provided between the first heating component and the second heating component, and the preheating area is located in the conveying direction; The first heating component and the second heating component each include a first housing, an air blowing component, and at least one heating tube; the first housing has a heating cavity, the air blowing component is connected to the first housing, and the air blowing end of the air blowing component is connected to the inlet of the heating cavity; the heating tube is connected to the first housing and is arranged in the conveying direction.

8. The electrode rolling device according to claim 6, characterized in that: The vacuuming mechanism includes a vacuum pipe, a guide pipe, a vacuum fan, and a recycling container; the input end of the vacuum pipe is directed toward the electrode body; the input end of the guide pipe is connected to the output end of the vacuum pipe; the output end of the guide pipe is connected to the input end of the vacuum fan; and the output end of the vacuum fan is connected to the interior of the recycling container.

9. The electrode rolling device according to claim 1, characterized in that: The electrode rolling device further includes at least two brushing and cleaning mechanisms, one of which is connected to the first rolling mechanism; the other of which is connected to the second rolling mechanism.

10. The electrode rolling device according to claim 9, characterized in that: The brushing and cleaning mechanism includes a rotating drum, a brushing component, and a drive motor; the drive motor is drivenly connected to one end of the rotating drum; the brushing component is connected to the outer surface of the rotating drum, and the brushing component is connected to the first roller pressing mechanism or the second roller pressing mechanism.

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