PIN plate feeding mechanism

By designing the PIN board loading mechanism, the problem of manual intervention in the repair and replacement of needle rolling in the existing winding technology is solved, and efficient loading of PIN board is achieved, reducing cost and processing difficulty, and improving the processing efficiency of battery cell winding.

CN222592739UActive Publication Date: 2025-03-11SHENZHEN GREENSUN TECH CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202420710733.3
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-08
Publication Date
2025-03-11
Estimated Expiration
2034-04-08

AI Technical Summary

Technical Problem

In the existing winding technology, the split structure of the roll needle causes manual intervention to be shut down and replaced, and the processing accuracy is high, the cost is high, the debugging is difficult, and the folding phenomenon is prone to occur during the rolling core forming.

Method used

A PIN board loading mechanism is designed, including a material frame, a PIN board feeding assembly and a PIN board loading robot assembly. The loading supply of the PIN board is independently completed through a simple structural design, reducing manual intervention.

Benefits of technology

It realizes efficient and reliable feeding of PIN boards, reduces the time and cost of manual intervention, improves the efficiency of cell winding, and reduces wrinkles during processing.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN222592739U_ABST
    Figure CN222592739U_ABST
Patent Text Reader

Abstract

The utility model discloses a PIN plate feeding mechanism which comprises a material frame, a PIN plate feeding assembly and a PIN plate feeding mechanical arm assembly, and the material frame is used for placing a plurality of PIN plates in a stacked mode. The PIN plate feeding assembly is arranged below the material frame, and the PIN plate feeding assembly is used for conveying the PIN plates in the material frame to a feeding position; and the PIN plate feeding manipulator assembly is arranged above the PIN plate supply assembly, and the PIN plate feeding manipulator assembly is used for carrying the PIN plates located at the feeding position to the tail coil station. The utility model provides a PIN plate feeding mechanism which can efficiently and reliably take and feed PIN plates, is simple in structure, can independently complete feeding and supply of the PIN plates, and reduces the time and cost of manual intervention.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The utility model relates to the technical field of electric core processing, in particular to a PIN plate feeding mechanism. Background Art

[0002] The winding needles of the existing winding technology are usually round, oval, or prismatic, and are all split structures, that is, a winding needle is divided into an upper winding needle and a lower winding needle, and both are fixed on the winding main drive mechanism; a winding station and a tail winding station are provided on the winding main drive, and the two are interchangeable and used together; when the upper winding needle or the lower winding needle has problems at the same time or individually and needs to be repaired or needs to be changed, it is necessary to stop the machine for manual intervention, and the tightness between the various mechanisms of the winding equipment causes a great waste of time and cost for maintenance personnel, and the processing accuracy requirements of the upper winding needle or the lower winding needle are high, the processing cost is high, and the debugging is difficult, and when the upper winding needle or the lower winding needle is used to wind the square battery cell after the core is rolled, wrinkles will appear on both sides of the inner diameter of the core.

[0003] In order to solve the above problems, the applicant designed a winding device that uses a PIN plate instead of a winding needle. However, the existing loading mechanism has a complex structure and cannot adapt to the loading and unloading of the PIN plate, which affects the efficiency of the battery cell winding process. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the utility model provides a PIN plate loading mechanism, which can efficiently and reliably retrieve and load PIN plates, and has a simple structure and can independently complete the PIN plate loading supply, reducing the time and cost of manual intervention.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A PIN plate feeding mechanism, comprising:

[0007] A material frame, the material frame is used to place multiple PIN plates;

[0008] A PIN plate feeding assembly, the PIN plate feeding assembly is arranged below the material frame, and the PIN plate feeding assembly is used to convey the PIN plate in the material frame to the loading position;

[0009] A PIN plate loading robot assembly is provided above the PIN plate feeding assembly and is used for conveying the PIN plate at the loading position to the tail roll station.

[0010] As a further improvement of the above technical solution, the material frame includes a material frame bottom plate, a connecting plate and multiple adjustment plates. The material frame bottom plate is provided with a slot for the PIN plate to pass through. The multiple adjustment plates are arranged along the edge of the slot. A storage space for accommodating the PIN plate is formed between the multiple adjustment plates. The connecting plate is movably connected to the material frame bottom plate, and the connecting plate is used to block or avoid the PIN plate from unloading from the slot.

[0011] As a further improvement of the above technical solution, a plurality of grooves for installing the adjustment plate are provided on the bottom plate of the material frame, and the position of the adjustment plate in the groove is adjustable so that the size of the storage space is adjustable.

[0012] As a further improvement of the above technical solution, the PIN plate feeding assembly includes a loading bracket, a loading mounting plate and a push plate power unit. The loading mounting plate is fixedly connected to the loading bracket. Two parallel guide plates are arranged on the loading mounting plate, and step grooves are arranged on opposite sides of the two guide plates. The two step grooves form a PIN plate guide groove. The PIN plate guide groove is used to guide the sliding of the PIN plate. The push plate power unit is used to drive the PIN plate to move to the loading position.

[0013] As a further improvement of the above technical solution, a PIN plate limit block is provided on the loading mounting plate, and the PIN plate limit block is located at the end of the PIN plate guide slot. When the PIN plate contacts the PIN plate limit block, the PIN plate is in the loading position.

[0014] As a further improvement of the above technical solution, a material frame guide slot is provided on the loading mounting plate, and the material frame bottom plate is slidably connected to the material frame guide slot. When the material frame bottom plate slides to the unloading position, the slot is located directly above the PIN plate guide slot, and the connecting plate is moved to prevent the PIN plate from falling into the PIN plate guide slot when the PIN plate is unloaded from the slot.

[0015] As a further improvement of the above technical solution, a limit bar and a stop block are provided on the material frame guide slot, the limit bar is used to limit the sliding of the material frame bottom plate on the material frame guide slot, and the stop block is used to limit the maximum distance of the material frame bottom plate moving in the direction of the PIN plate guide slot.

[0016] As a further improvement of the above technical solution, the push plate power unit includes a pushing cylinder, a push plate, a linear guide and a slide. The push plate is slidably connected to the PIN plate guide groove, the linear guide and the pushing cylinder are fixedly connected to the bottom of the feeding mounting plate, the pushing cylinder is used to drive the slider of the linear guide to move, the slide is connected to the slider of the linear guide, the push plate is connected to the top of the slide, and the feeding mounting plate is provided with a notch for avoiding the movement of the slide.

[0017] As a further improvement of the above technical solution, the PIN plate feeding robot assembly includes a transverse movement module, a connecting bracket and a robot clamp, and the robot clamp is installed on the movable end of the transverse movement module through the connecting bracket; the robot clamp includes a lower clamp, an upper clamp, a connecting plate and a clamp cylinder, the clamp cylinder and the upper clamp are fixed on the connecting bracket, the connecting plate is slidably connected to the connecting bracket through a linear guide rail, the lower clamp is installed on the connecting plate and is located directly below the upper clamp, and the clamp cylinder is used to drive the connecting plate to move up and down to drive the lower clamp close to or away from the upper clamp.

[0018] As a further improvement of the above technical solution, the guide plate is provided with an opening, and the lower clamping plate can pass through the opening and move to below the PIN plate.

[0019] The beneficial effects of the utility model are:

[0020] When the PIN plate is about to be loaded, the PIN plate feeding assembly starts to transfer the PIN plate in the material basket until the PIN plate is pushed to the loading position (i.e., the picking position of the PIN plate loading manipulator assembly). The PIN plate loading manipulator receives the signal, and the lower clamping plate cooperates with the upper clamping plate to clamp the PIN plate located at the picking position, completing the pre-loading operation of the PIN plate; when the tail roll station is received for PIN plate loading, the transverse movement module receives the command, and transfers the PIN plate loading manipulator that clamps the PIN plate to the PIN plate loading position set at the tail roll station. After the top mechanism completes the fixed support of the PIN plate, the manipulator clamping plate cancels the clamping of the PIN plate, and the transverse movement module returns to the standby position (reset) to complete the loading operation of the PIN plate. The PIN plate loading mechanism of the utility model has a simple structure, can efficiently and reliably pick up and load the PIN plate, improves work efficiency, and reduces the time and cost of manual intervention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 This is a schematic diagram of the assembly of a PIN plate feeding mechanism of the utility model;

[0023] Figure 2 It is a structural schematic diagram of the material frame in the utility model;

[0024] Figure 3 It is a top view of the material frame in the utility model;

[0025] Figure 4 It is a structural schematic diagram of the bottom plate of the material frame in the utility model;

[0026] Figure 5 It is a structural schematic diagram of the connecting piece in the utility model;

[0027] Figure 6 It is a structural schematic diagram of the PIN plate feeding assembly in the utility model;

[0028] Figure 7 This is a structural breakdown diagram of the PIN plate feeding assembly in the utility model;

[0029] Figure 8 It is a structural schematic diagram of the PIN plate feeding manipulator assembly in the utility model;

[0030] Fig. 9 It is a structural disassembly diagram of the PIN plate feeding component in the utility model.

[0031] Figure numerals: 1, material frame; 11, material frame bottom plate; 111, concave surface; 112, positioning column; 113, groove; 12, adjustment plate; 13, connecting piece; 131, bar-shaped positioning hole; 132, support portion; 14, handle; 15, notch; 2, PIN plate feeding assembly; 21, loading bracket; 22, loading mounting plate; 221, notch; 23, material frame pad; 231, first step groove; 24, lower limit strip; 25, upper limit strip; 26, stopper; 27, guide plate; 271, second step groove; 272, opening; 28, PIN plate limit block; 29 , push plate power unit; 291, push plate; 292, slide plate; 293, slide rail; 294, slider; 295, cylinder mounting plate; 296, push cylinder; 3, PIN plate feeding robot assembly; 31, transverse movement module; 311, fixed plate; 312, second linear guide; 313, motor; 314, screw rod; 315, ball nut; 32, connecting bracket; 33, robot gripper; 331, connecting plate; 332, third linear guide; 333, clamping plate mounting plate; 334, clamping plate cylinder; 335, upper clamping plate; 336, lower clamping plate; 4, PIN plate. DETAILED DESCRIPTION

[0032] The following will be combined with the embodiments and drawings to clearly and completely describe the concept, specific structure and technical effects of the utility model, so as to fully understand the purpose, characteristics and effects of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the utility model. In addition, all the connection / connection relationships involved in the patent do not refer to the direct connection of components, but refer to the fact that according to the specific implementation situation, a better connection structure can be formed by adding or reducing connection accessories. For example, fixed connection / fixed installation can be selected according to the needs of screw connection, bolt connection, pin connection, key connection, bonding, mortise and tenon connection, welding, riveting and other methods. For example, detachable connection can be selected according to the needs of screw connection, bolt connection, threaded connection, snap connection, mortise and tenon connection, Velcro connection and other methods. The various technical features in the creation of the utility model can be combined interactively without conflicting with each other.

[0033] Reference Figure 1 A PIN plate feeding mechanism includes a material frame 1, a PIN plate feeding assembly 2 and a PIN plate feeding robot assembly 3, wherein the PIN plate feeding assembly 2 is arranged below the material frame 1, and the PIN plate feeding robot assembly 3 is arranged above the PIN plate feeding assembly 2. In this embodiment, a plurality of PIN plates 4 are stacked and placed in the material frame 1 for material preparation (in this embodiment, the PIN plate 4 refers to the square core plate inside the battery cell), and then the PIN plate feeding assembly 2 conveys the PIN plate 4 in the material frame 1 to the loading position (i.e., the material taking position of the PIN plate feeding robot assembly 3), and the PIN plate feeding robot assembly 3 transports the PIN plate 4 at the loading position to the tail winding position, and waits for the top mechanism in the winding device to complete the fixed support of the PIN plate 4, and the PIN plate feeding robot assembly 3 cancels the clamping of the PIN plate 4 and returns to the standby position (reset), completing the feeding operation of the PIN plate 4.

[0034] In a specific embodiment, refer to Figure 2-Figure 4 The material frame 1 includes a material frame bottom plate 11, a connecting piece 13 and six adjustment plates 12. The material frame bottom plate 11 is provided with a slot 15 for the PIN plate 4 to pass through. The six adjustment plates 12 are arranged along the edge of the slot 15. A rectangular storage space for accommodating the PIN plate 4 is formed between the six adjustment plates 12. Furthermore, six grooves 113 for installing the adjustment plates 12 are provided on the bottom plate of the material frame bottom plate 11. The adjustment plates 12 and the grooves 113 can be installed by snap connection, screw connection, etc.

[0035] In addition, in a preferred embodiment, the position of the adjustment plate 12 in the groove 113 is adjustable, so that by adjusting the position of the adjustment plate 12 in the groove 113, the size of the storage space can be adjusted to accommodate the storage of PIN plates 4 of different sizes.

[0036] The material frame bottom plate 11 is provided with a concave surface 111 on both sides along the long side direction of the notch 15, and the connecting piece 13 is movably engaged in the concave surface 111 on the material frame bottom plate 11, and the connecting piece 13 can be driven to move closer to or away from the notch 15 by external force, as shown in FIG. Figure 5 The connecting piece 13 is a Z-shaped structure, and the bottom of the connecting piece 13 is a supporting portion 132. When the connecting piece 13 is driven to move toward the notch 15, the supporting portion 132 is located below the notch 15 and can support the PIN plate 4, so that the PIN plate 4 stays in the material frame 1; when the connecting piece 13 is driven to move away from the notch 15, the supporting portion 132 no longer supports the PIN plate 4, and the PIN plate 4 will fall down from the notch 15, making it easier for the PIN plate feeding assembly 2 to carry it to the loading position.

[0037] In a preferred embodiment, a positioning column 112 is provided on the concave surface 111 , and a strip-shaped positioning hole 131 is provided on the connecting piece 13 . The stability of the movement of the connecting piece 13 can be achieved through the cooperation between the strip-shaped positioning hole 131 and the positioning column 112 .

[0038] Furthermore, a handle 14 is provided on the material frame bottom plate 11 , and the material frame 1 is conveniently carried by the handle 14 .

[0039] In a specific embodiment, refer to Figure 6 and Figure 7 , the PIN plate feeding assembly 2 includes a loading bracket 21, a loading mounting plate 22 and a push plate power unit 29, the loading mounting plate 22 is fixedly connected to the loading bracket 21, and two parallel guide plates 27 are arranged on the loading mounting plate 22, and a second step groove 271 is arranged on the opposite side of the two guide plates 27, and the two second step grooves 271 form a PIN plate guide slide, and the PIN plate 4 in the material frame 1 falls into the PIN plate guide slide after falling from the notch 15, and the PIN plate guide slide is used to guide the sliding of the PIN plate 4. Further, a PIN plate limit block 28 is arranged on the loading mounting plate 22, and the PIN plate limit block 28 is located at the end of the PIN plate guide slide. When the PIN plate 4 contacts the PIN plate limit block 28, the PIN plate 4 is in the loading position, so that the PIN plate 4 is driven by the push plate power unit 29 to slide in the PIN plate guide slide to the loading position, thereby facilitating the PIN plate feeding manipulator assembly 3 to take the PIN plate 4.

[0040] Furthermore, a material frame 1 guide groove is provided on the loading mounting plate 22. Specifically, two parallel material frame pads 23 are provided on the loading mounting plate 22. The opposite sides of the two material frame pads 23 are provided with first step grooves 231. The two first step grooves 231 form the material frame 1 guide groove. The material frame bottom plate 11 is slidably connected to the material frame 1 guide groove. When the material frame bottom plate 11 slides to the unloading position, the notch 15 is located directly above the PIN plate guide groove. The connecting piece 13 is moved to avoid the PIN plate 4 from unloading from the notch 15, so that the PIN plate 4 falls into the PIN plate guide groove.

[0041] Furthermore, the guide chute of the material frame 1 is provided with a limit bar and a stopper 26, the limit bar includes an upper limit bar 25 and a lower limit bar 24, the lower limit bar 24 is provided at the bottom of the material frame pad 23, the upper limit bar 25 is provided at the top of the material frame pad 23, the upper limit bar 25 and the lower limit bar 24 form a limit space, so that the material frame bottom plate 11 can only move horizontally on the guide chute of the material frame 1, and prevent the material frame bottom plate 11 from being displaced in the vertical direction when moving, thereby avoiding the material frame 1 from jumping when moving. In addition, the stopper 26 is provided at the end of the material frame pad 23, and is used to limit the limit distance of the material frame bottom plate 11 moving in the direction of the PIN plate guide chute, that is, when the material frame bottom plate 11 moves to contact with the stopper 26, the material frame 1 is in the unloading position, and at this time, the notch 15 is located in the PIN plate guide chute, so the PIN plate 4 can stably fall into the PIN plate guide chute.

[0042] In this embodiment, refer to Figure 7 The push plate power unit 29 includes a push cylinder 296, a push plate 291, a first linear guide and a slide 292. The push plate 291 is slidably connected to the PIN plate guide groove. The slide 293 of the first linear guide is fixedly connected to the bottom of the loading mounting plate 22. The push cylinder 296 is fixedly connected to the bottom of the loading mounting plate 22 through the cylinder mounting plate 295. The piston rod of the push cylinder 296 is connected to the slider 294 of the first linear guide through a fisheye joint. The slide 292 is also connected to the slider 294. The push plate 291 is connected to the top of the slide 292. The loading mounting plate 22 is provided with a notch 221 for avoiding the movement of the slide 292. Through the above arrangement, the pushing cylinder 296 can drive the slider 294 to move on the slide rail 293 when it is extended and retracted, thereby driving the push plate 291 to slide in the PIN plate guide groove. When the PIN plate 4 falls into the PIN plate guide groove, the pushing cylinder 296 drives the push plate 291 to move and pushes the PIN plate 4 to the loading position, and then the pushing start drives the push plate 291 to return to the standby position (reset) to facilitate the loading of the next PIN plate 4.

[0043] In a specific embodiment, refer to Figure 8 and Fig. 9 The PIN plate feeding robot assembly 3 includes a transverse movement module 31, a connecting bracket 32 ​​and a robot clamp 33. The robot clamp 33 is installed on the movable end of the transverse movement module 31 through the connecting bracket 32. Specifically, the transverse movement module 31 includes a fixed plate 311, a motor 313, a screw module and a second linear guide 312. The second linear guide 312 limits and guides the ball nut 315 in the screw module. The motor 313 drives the screw 314 in the screw module to rotate, thereby driving the ball nut 315 in the screw module to move. The connecting bracket 32 ​​is fixedly connected to the ball nut 315, thereby driving the robot clamp 33 to move from the loading position to the tail winding position.

[0044] Furthermore, the manipulator clamp 33 includes a lower clamp plate 336, an upper clamp plate 335, a connecting plate 331 and a clamp cylinder 334, the clamp cylinder 334 and the upper clamp plate 335 are fixed on the connecting bracket 32, the connecting plate 331 is slidably connected to the connecting bracket 32 ​​via a third linear guide 332, the lower clamp plate 336 is fixedly connected to the connecting plate 331 via a clamp mounting plate 333, and the lower clamp plate 336 is located directly below the upper clamp plate 335, the piston rod of the clamp cylinder 334 is connected to the clamp mounting plate 333, thereby driving the connecting plate 331 and the lower pressure plate to move up and down, so that the lower clamp plate 336 is close to or away from the upper clamp plate 335.

[0045] The guide plate 27 is provided with an opening 272. When the PIN plate 4 moves to the loading position, the transverse movement module 31 drives the lower clamping plate 336 to pass through the opening 272 and move to the bottom of the PIN plate 4. Then the clamping plate cylinder 334 drives the lower pressure plate to move up and moves the PIN plate 4 upward. Then the upper pressure plate and the lower pressure plate clamp the PIN plate 4. At this time, the PIN plate 4 leaves the guide plate 27 (the PIN plate 4 is higher than the guide plate 27). The transverse movement module 31 drives the PIN plate 4 to move to the tail winding station to realize the loading of the PIN plate 4.

[0046] The above is a specific description of the preferred implementation of the utility model, but the invention of the utility model is not limited to the described embodiments. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the utility model. These equivalent deformations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A PIN plate feeding mechanism, characterized in that: include: A material frame, the material frame is used to place multiple PIN plates; A PIN plate feeding assembly, the PIN plate feeding assembly is arranged below the material frame, and the PIN plate feeding assembly is used to convey the PIN plate in the material frame to the loading position; The PIN plate loading robot assembly is used to move the PIN plate at the loading position to the tail winding position.

2. A PIN plate feeding mechanism according to claim 1, characterized in that: The material frame includes a material frame bottom plate, a connecting piece and a plurality of adjusting plates. A slot for a PIN plate to pass through is arranged on the material frame bottom plate. The plurality of adjusting plates are arranged along the edge of the slot. A storage space for accommodating the PIN plate is formed between the plurality of adjusting plates. The connecting piece is movably connected to the material frame bottom plate. The connecting piece is used to block or prevent the PIN plate from unloading from the slot.

3. A PIN plate feeding mechanism according to claim 2, characterized in that: A plurality of grooves for mounting the adjustment plate are arranged on the bottom plate of the material frame, and the position of the adjustment plate in the groove is adjustable so that the size of the storage space can be adjusted.

4. A PIN plate feeding mechanism according to claim 2, characterized in that: The PIN plate feeding assembly includes a loading bracket, a loading mounting plate and a push plate power unit. The loading mounting plate is fixedly connected to the loading bracket. Two parallel guide plates are arranged on the loading mounting plate, and step grooves are arranged on opposite sides of the two guide plates. The two step grooves form a PIN plate guide slot. The PIN plate guide slot is used to guide the sliding of the PIN plate. The push plate power unit is used to drive the PIN plate to move to the loading position.

5. A PIN plate feeding mechanism according to claim 4, characterized in that: A PIN plate limiting block is arranged on the feeding installation plate, and the PIN plate limiting block is located at the end of the PIN plate guiding slot. When the PIN plate contacts the PIN plate limiting block, the PIN plate is in the feeding position.

6. A PIN plate feeding mechanism according to claim 5, characterized in that: A material frame guide slot is provided on the loading mounting plate, and the material frame bottom plate is slidably connected to the material frame guide slot. When the material frame bottom plate slides to the unloading position, the slot is located directly above the PIN plate guide slot. The connecting piece is moved to prevent the PIN plate from falling into the PIN plate guide slot when the PIN plate is unloaded from the slot.

7. A PIN plate feeding mechanism according to claim 6, characterized in that: A limit bar and a stop block are arranged on the material frame guide slot, wherein the limit bar is used to limit the sliding of the material frame bottom plate on the material frame guide slot, and the stop block is used to limit the maximum distance of movement of the material frame bottom plate in the direction of the PIN plate guide slot.

8. A PIN plate feeding mechanism according to claim 7, characterized in that: The push plate power unit includes a push cylinder, a push plate, a linear guide and a slide. The push plate is slidably connected to the PIN plate guide groove. The linear guide and the push cylinder are fixedly connected to the bottom of the feeding mounting plate. The push cylinder is used to drive the slider of the linear guide to move. The slide is connected to the slider of the linear guide. The push plate is connected to the top of the slide. The feeding mounting plate is provided with a notch for avoiding the movement of the slide.

9. A PIN plate feeding mechanism according to claim 4, characterized in that: The PIN plate feeding robot assembly includes a transverse movement module, a connecting bracket and a robot clamp, and the robot clamp is installed on the movable end of the transverse movement module through the connecting bracket; the robot clamp includes a lower clamp, an upper clamp, a connecting plate and a clamp cylinder, the clamp cylinder and the upper clamp are fixed on the connecting bracket, the connecting plate is slidably connected to the connecting bracket through a linear guide rail, the lower clamp is installed on the connecting plate and is located directly below the upper clamp, and the clamp cylinder is used to drive the connecting plate to move up and down to drive the lower clamp close to or away from the upper clamp.

10. A PIN plate feeding mechanism according to claim 9, characterized in that: The guide plate is provided with an opening, and the lower clamping plate can pass through the opening and move to below the PIN plate.