Pin bending equipment

Abstract

The utility model relates to the technical field of electronic component preparation. The utility model provides a pin bending device, the first end of a pin is connected with the head of a product, and the second end of the pin is a free end; the pin bending equipment comprises a positioning structure, a pressing structure and a movable die structure. The second end of the pin is clamped between the positioning structure and the pressing structure, the movable die structure moves relative to the pin, the movable die structure abuts against the first end of the pin, and the movable die structure is used for bending the pin. The free ends of the base pins are pressed through the positioning structures and the pressing structures, the phenomenon that when the base pins are bent through the movable die structure, the distance between the base pins is randomly increased or reduced can be avoided, the correction procedure can be omitted, the manufacturing cost is reduced, and the assembling efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic component preparation, in particular to a pin bending device. Background Art

[0002] There are two types of optoelectronic components, namely PIC light elements and LED light elements, which are two important components of photoelectric sensors. Before assembling these two optoelectronic components in the photoelectric sensor, the pins need to be bent 90°, and the bending angle and the spacing between two adjacent pins after bending are strictly required.

[0003] The existing bending methods are to fix the product head and one end of the pin connected to the product head, then press it, and use the moving die to punch and bend the other end of the pin to bend the pin to 90 degrees. The advantages of this bending method are simple equipment structure, fewer parts, low cost, and high reliability; the disadvantages are that since the end of the bent end pin is unconstrained during the bending process, any slight disturbance of the bending part will be magnified at the end, causing the distance between the two adjacent pins at the bent end to expand or shrink randomly after bending, and the longer the length of the bent end of the pin, the more obvious this effect.

[0004] The bent ends of the pins of the commonly used PIC light elements and LED light elements are very long, and the pin spacing after bending requires high dimensional accuracy. In order to improve the installation accuracy, it is necessary to add a correction process before assembling the photoelectric sensor to correct the pin spacing, which increases the manufacturing cost and reduces the assembly efficiency. Utility Model Content

[0005] In view of this, the utility model provides a tube pin bending device.

[0006] Specifically, the following technical solutions are included:

[0007] The present application provides a tube pin bending device, wherein the first end of the tube pin is connected to the head of the product, and the second end of the tube pin is a free end;

[0008] The tube pin bending equipment comprises a positioning structure, a pressing structure and a movable mold structure;

[0009] The second end of the tube pin is clamped between the positioning structure and the pressing structure, the movable mold structure moves relative to the tube pin, the movable mold structure and the first end of the tube pin are against each other, and the movable mold structure is used to bend the tube pin.

[0010] Preferably, the tube pin bending device further comprises a product groove;

[0011] The product groove is arranged on the positioning structure or the pressing structure, and the product head is located in the product groove after the tube pin is bent.

[0012] Preferably, the positioning structure includes a positioning block and a positioning groove;

[0013] The positioning groove is arranged on the side wall of the positioning block, and the second end of the pin is placed in the positioning groove;

[0014] The depth of the positioning groove is smaller than the thickness of the pin, and the second end of the pin is pressed between the pressing structure and the positioning groove.

[0015] Preferably, the positioning structure includes a positioning block and a positioning groove;

[0016] The pressing structure comprises a pressing block and a pressing edge;

[0017] The positioning groove is arranged on the side wall of the positioning block, and the second end of the pin is placed in the positioning groove;

[0018] The clamping edge is arranged on the side wall of the clamping block, the depth of the positioning groove is greater than the thickness of the pin, the clamping edge is inserted into the positioning groove, and the second end of the pin is clamped between the clamping edge and the positioning groove.

[0019] Preferably, the positioning structure further includes a positioning sheet;

[0020] The pins are provided in plurality, and the plurality of pins are arranged in the positioning grooves;

[0021] The end of the positioning piece is inserted between two adjacent pins.

[0022] Preferably, the positioning piece and the movable mold structure are arranged on the same side of the pin;

[0023] The movable mold structure performs linear motion, and the length extension direction of the positioning piece is arranged in parallel with the running direction of the movable mold structure.

[0024] Preferably, the positioning groove is provided in plurality, and the pin is provided in plurality;

[0025] The positioning grooves and the pins are arranged in one-to-one correspondence.

[0026] Preferably, the movable mold structure includes a driving structure and a bending plate;

[0027] The driving structure is connected to the bending plate, the bending plate and the first end of the tube pin are against each other, and the bending point of the tube pin is located on the rotation axis of the bending plate.

[0028] Preferably, the driving structure comprises a driving member, a rack and a gear;

[0029] The bending plate is connected to the gear, the driving member is connected to the rack, and the gear and the rack are meshingly connected.

[0030] Preferably, the bending angle of the pin is greater than 90°.

[0031] The beneficial effects of the technical solution provided by the utility model include at least:

[0032] The present application uses a positioning structure and a clamping structure to clamp the free end of the pin, which can avoid the random expansion or reduction of the pin spacing when the movable mold structure bends the pin, and can eliminate the correction process, reducing manufacturing costs and improving assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 This is a schematic diagram of the LED light element structure of an embodiment of the utility model;

[0035] Figure 2 This is a schematic diagram of the structure of a PIC light element according to an embodiment of the utility model;

[0036] Figure 3 It is a schematic diagram of the existing pin bending structure;

[0037] Figure 4 This is a schematic diagram of a bent cross-sectional structure of a tube pin according to an embodiment of the utility model;

[0038] Figure 5 A schematic diagram of a pin bending structure of an embodiment of the utility model;

[0039] Figure 6 A schematic diagram of a cross-sectional structure of a bent tube pin of another embodiment of the utility model;

[0040] Figure 7 This is a schematic diagram of a pin bending structure according to another embodiment of the utility model.

[0041] The reference numerals in the figures represent respectively:

[0042] 11-product head; 12-tube pin; 2-positioning block; 21-positioning groove; 3-pressing block; 31-pressing edge; 4-movable mold structure; 41-bending plate; 42-gear; 43-rack; 5-product groove; 6-positioning piece.

[0043] The above drawings have shown clear embodiments of the present invention, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present invention in any way, but to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0045] Before further describing the embodiments of the present invention in detail, the directional nouns involved in the embodiments of the present invention, such as "upper part", "lower part", "side part", etc., are Figure 1 The orientation shown in is a reference and does not limit the protection scope of the present utility model.

[0046] In order to make the technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0047] There are currently two types of optoelectronic components, namely Figure 1 The LED light elements shown and Figure 2 The PIC photoelement shown in the figure is an important component of the photoelectric sensor. Figure 3 As shown, the existing bending methods are to fix the product head 11 and one end of the pin 12 connected to the product head 11, and then press them, and the movable mold punches and bends the other end of the pin 12 to bend the pin 12 to 90°. In this bending method, since the end of the bent end pin 12 is unconstrained during the bending process, any slight disturbance of the bent part will be magnified at the end, so that the distance between two adjacent pins 12 at the bent end after bending will randomly expand or shrink, and the longer the length of the bent end of the pin 12, the more obvious this effect is. In order to improve the installation accuracy, the pins 12 bent by the existing bending method need to add a correction process before assembly to correct the distance between the pins 12, which increases the manufacturing cost and reduces the assembly efficiency.

[0048] like Figures 4 to 7As shown, the present application provides a tube pin bending device, the first end of the tube pin 12 is connected to the product head 11, the second end of the tube pin 12 is a free end, the tube pin bending device includes a positioning structure, a clamping structure and a movable mold structure 4, the second end of the tube pin 12 is clamped between the positioning structure and the clamping structure, the movable mold structure 4 moves relative to the tube pin 12, the movable mold structure 4 and the first end of the bent tube pin 12 are against each other, and the movable mold structure 4 is used to bend the tube pin. The present application clamps the free end of the tube pin 12 by the positioning structure and the clamping structure, which can avoid the random expansion or reduction of the spacing between the tube pins 12 when the movable mold structure 4 bends the tube pin 12, and can cancel the correction process, reduce the manufacturing cost, and improve the assembly efficiency.

[0049] Embodiment 1

[0050] like Figure 4 and Figure 5 As shown, the tube pin bending device also includes a product groove 5, which is arranged on a positioning structure or a pressing structure. After the tube pin 12 is bent, the product head 11 is located in the product groove 5.

[0051] Specifically, whether the product groove 5 is arranged on the positioning structure or the pressing structure is related to the bending direction of the tube pin 12. The arrangement of the product groove 5 avoids the damage of the equipment to the product head 11 after the tube pin 12 is bent. Figure 4 As shown, the movable mold structure 4 moves from right to left to bend the tube pin 12, and the first end of the tube pin 12 is bent to the left. The product groove 5 is set on the positioning structure. After the bending is completed, the product head 11 is located in the product groove 5.

[0052] The pressing structure comprises a pressing block 3 .

[0053] Specifically, Figure 5 As shown, the positioning structure includes a positioning block 2 and a positioning groove 21. The positioning groove 21 is arranged on the side wall of the positioning block 2, and the second end of the pin 12 is placed in the positioning groove 21. The depth of the positioning groove 21 is less than the thickness of the pin 12, and the second end of the pin 12 is pressed between the pressing structure and the positioning groove 21.

[0054] Specifically, Figure 5 As shown, the positioning groove 21 is arranged on the side wall opposite to the positioning block 2 and the pressing block 3. The positioning groove 21 has an upper opening and a side opening, and the pressing block 3 can cover the side opening. Figure 4 The positioning groove 21 is arranged on the right side wall of the positioning block 2. The positioning groove 21 has an upper opening, a lower opening and a right side opening. The upper opening and the lower opening are arranged opposite to each other, and the pressing block 3 can cover the right side opening. The depth of the positioning groove 21 refers to the depth of the positioning groove 21 in the horizontal direction. Only when the depth of the positioning groove 21 is less than the thickness of the pin 12, the positioning block 2 and the pressing block 3 can press the pin 12.

[0055] like Figure 5 As shown, the positioning structure further includes a positioning piece 6, which is arranged on the positioning block 2 or the pressing block 3. A plurality of pins 12 are arranged, and the plurality of pins 12 are arranged in the positioning groove 21, and the end of the positioning piece 6 is inserted between two adjacent pins 12.

[0056] Specifically, the location of the positioning piece 6 is related to the bending direction of the pin 12. The positioning piece 6 is arranged in the opposite direction of the bending direction of the pin 12. For example, if the bending direction of the pin 12 is to bend to the left, the positioning piece 6 is arranged on the right side of the pin 12. Figure 5 As shown, the positioning piece 6 is arranged on the pressing block 3. In this embodiment, since a plurality of pins 12 are arranged in one positioning groove 21, in order to prevent the distance between two adjacent pins 12 from randomly decreasing when bending, the end of the positioning piece 6 is inserted between two adjacent pins 12. Figure 1 As shown, when there are two pins 12, the end of the positioning piece 6 is inserted between the two pins 12 to fix the distance between the two pins 12; Figure 2 As shown, when there are multiple pins 12, the end of the positioning piece 6 includes multiple branch ends arranged in parallel, the width of the branch end is equal to the distance between two adjacent pins 12, and one branch end is inserted between two adjacent pins 12. If there are four pins 12, three branch ends are arranged, and one branch end is inserted between two adjacent pins 12.

[0057] Specifically, the positioning piece 6 and the movable mold structure 4 are arranged on the same side of the pin 12. The movable mold structure 4 moves linearly, and the length extension direction of the positioning piece 6 is arranged parallel to the running direction of the movable mold structure 4. In this embodiment, the positioning piece 6 also guides the movement of the movable mold structure 4.

[0058] Specifically, in another embodiment, if the positioning piece 6 is not provided, in order to prevent the random reduction of the distance between two adjacent pins 12 during bending, a plurality of positioning grooves 21 are provided, a plurality of pins 12 are provided, one positioning groove 21 is provided for one pin 12, and the positioning grooves 21 and the pins 12 are provided one to one. The provision of the positioning grooves 21 improves the dimensional accuracy of the electrical components during bending.

[0059] During operation, ① the tube pin 12 is placed in the positioning groove 21, and the tube pin 12 is adjusted to be inserted downward to meet the requirements; ② the clamping block 3 moves to the left, and the end of the positioning piece 6 is inserted between two adjacent tube pins 12, and the clamping block 3 and the positioning block 2 clamp the tube pin 12; ③ the movable mold structure 4 moves to the left from the original position, and the first end of the tube pin 12 is bent to the left under the action of the movable mold structure 4 until the product head 11 falls into the product groove 5; ④ the movable mold structure 4 moves to the right until it returns to the original position, and the bending is completed in one step.

[0060] Specifically, a limiting structure can be set on the positioning block 2 or the clamping block 3, and the second end of the pin 12 abuts against the limiting structure, thereby limiting the depth of the second end of the pin 12 inserted downward into the positioning groove 21, so as to quickly and accurately determine the bending point of the pin 12, improve the dimensional accuracy of the optoelectronic components, and improve the bending efficiency.

[0061] Specifically, since the pin 12 is made of metal and has springback, the bending angle of the pin 12 is greater than 90°. After the pin 12 rebounds, the bending angle of the pin 12 will be exactly 90°, which improves the dimensional accuracy of the optoelectronic component during bending. The bending angle is the rotation angle of the first end of the pin 12 along the bending direction. Specifically, Figure 4 As shown, in order to achieve a bending angle of the pin 12 greater than 90°, the angle between the positioning block 2 and the wall at the bending point of the pin 12 is less than 90°, that is, the upper right corner of the positioning block 2 is less than 90°, and the movable mold structure 4 is tilted, and the cross-sectional thickness of the positioning piece 6 gradually decreases from right to left.

[0062] Embodiment 2

[0063] like Figure 6 and Figure 7 As shown, the tube pin bending device also includes a product groove 5, which is arranged on a positioning structure or a pressing structure. After the tube pin 12 is bent, the product head 11 is located in the product groove 5.

[0064] Specifically, whether the product groove 5 is arranged on the positioning structure or the pressing structure is related to the bending direction of the tube pin 12. The arrangement of the product groove 5 avoids the damage of the equipment to the product head 11 after the tube pin 12 is bent. Figure 6 As shown, the movable mold structure 4 rotates clockwise with the bending point of the pin 12 as the axis to bend the pin 12, and the first end of the pin 12 is bent upward. The product groove 5 is set on the clamping structure. After the bending is completed, the product head 11 is located in the product groove 5.

[0065] The pressing structure includes a pressing block 3, and a product groove 5 is arranged on the side wall of the pressing block 3. Figure 6 As shown, the product groove 5 is arranged on the left side wall of the pressing block 3.

[0066] like Figure 6 and Figure 7As shown, the positioning structure includes a positioning block 2 and a positioning groove 21, and the clamping structure includes a clamping block 3 and a clamping ridge 31. The positioning groove 21 is arranged on the side wall of the positioning block 2, and the second end of the tube pin 12 is placed in the positioning groove 21. The clamping ridge 31 is arranged on the side wall of the clamping block 3. The depth of the positioning groove 21 is greater than the thickness of the tube pin 12. The clamping ridge 31 is inserted into the positioning groove 21, and the second end of the tube pin 12 is clamped between the clamping ridge 31 and the positioning groove 21. A plurality of positioning grooves 21 are arranged, and a plurality of tube pins 12 are arranged. One positioning groove 21 is arranged for one tube pin 12, and the positioning grooves 21 and the tube pins 12 are arranged one by one. For example, Figure 1 As shown, when the pin 12 has two, two pressing edges 31 are provided, and one pressing edge 31 is inserted between one positioning groove 21 to fix the first end of the pin 12; Figure 2 As shown, when there are four tube pins 12, four pressing edges 31 are provided, and one pressing edge 31 is inserted between one positioning groove 21 to fix the first end of the tube pin 12. The depth of the positioning groove 21 is greater than the thickness of the tube pin 12, so that the pressing edge 31 can be limited while the tube pin 12 is pressed, so as to achieve stability in pressing the tube pin 12.

[0067] Specifically, the positioning block 2 is arranged horizontally, the positioning groove 21 is arranged on the upper side wall of the positioning block 2 , the depth of the positioning groove 21 refers to the depth of the positioning groove 21 in the vertical plane, and the pressing block 3 is arranged above the positioning block 2 .

[0068] Specifically, in another embodiment, the depth of the positioning groove 21 is less than the thickness of the pin 12, and a plurality of pins 12 are provided. The plurality of pins 12 are provided in one positioning groove 21. In order to prevent the random reduction of the distance between two adjacent pins 12 during bending, the pressing edge 31 is provided between two adjacent pins 12. For example, Figure 1 As shown, when there are two pins 12, one pressing edge 31 is provided, and the pressing edge 31 is inserted between the two pins 12 to fix the distance between the two pins 12; Figure 2 As shown, when there are multiple pins 12, multiple pressing edges 31 are provided, the width of the pressing edge 31 is equal to the distance between two adjacent pins 12, and one pressing edge 31 is inserted between two adjacent pins 12. If there are four pins 12, three pressing edges 31 are provided, and one pressing edge 31 is inserted between two adjacent pins 12. Only when the depth of the positioning groove 21 is less than the thickness of the pin 12 can the positioning block 2 and the pressing block 3 press the pin 12. The provision of the positioning groove 21 improves the dimensional accuracy of the optoelectronic component during bending.

[0069] like Figure 6 and Figure 7As shown, the movable mold structure 4 includes a driving structure and a bending plate 41, the driving structure and the bending plate 41 are connected, the bending plate 41 and the first end of the pin 12 are against each other, and the bending point of the pin 12 is located on the rotation axis of the bending plate 41. Specifically, as Figure 6 As shown, the cross section of the bending plate 41 is fan-shaped, and the bending point of the pin 12 is located at the center of the fan. Figure 7 As shown, the length of the bending plate 41 extends along the width direction of the positioning block 2, and the length extension direction of the bending plate 41 is perpendicular to the length extension direction of the positioning slot 21. The driving structure drives the bending plate 41 to rotate clockwise around the rotation axis, and the first end of the pin 12 is bent upward under the action of the bending plate 41.

[0070] Specifically, Figure 7 As shown, the driving structure includes a driving member, a rack 43 and a gear 42, the bending plate 41 is connected to the gear 42, the driving member is connected to the rack 43, and the gear 42 is meshed and connected to the rack 43. The driving member drives the rack 43 to move up and down, and the gear 42 rotates as the rack 43 moves up and down.

[0071] During operation, ① place the tube pin 12 into the positioning groove 21, and adjust the insertion depth of the tube pin 12 to the right to meet the requirements; ② the clamping block 3 and the positioning block 2 clamp the tube pin 12; ③ the driving member drives the rack 43 to move downward, and the gear 42 and the bending plate 41 rotate clockwise at the same time, and the first end of the tube pin 12 is bent upward under the action of the bending plate 41 until the product head 11 falls into the product groove 5; ④ the driving member drives the rack 43 to move upward, and the gear 42 and the bending plate 41 rotate counterclockwise at the same time, and the bending plate 41 returns to its original position, and one-time bending is completed.

[0072] Specifically, a limiting structure can be provided on the positioning block 2, and the end faces of the product head 11 opposite to the first end of the tube pin 12 abut against the limiting structure, thereby limiting the depth of the second end of the tube pin 12 inserted to the right into the positioning groove 21, so as to quickly and accurately determine the bending point of the tube pin 12, improve the dimensional accuracy of the optoelectronic components, and improve the bending efficiency.

[0073] Specifically, since the pin 12 is made of metal and has springback, the bending angle of the pin 12 is greater than 90°. After the pin 12 rebounds, the bending angle of the pin 12 will be exactly 90°, which improves the dimensional accuracy of the optoelectronic component during bending. The bending angle is the rotation angle of the first end of the pin 12 along the bending direction. Specifically, Figure 6 As shown, in order to achieve a bending angle of the pin 12 greater than 90°, the angle between the wall where the pressing block 3 and the bending point of the pin 12 abut is less than 90°, that is, the lower left corner of the pressing block 3 is less than 90°.

[0074] The LED light element and the PIC light element are bent in the manner of Embodiment 1 or Embodiment 2. Preferably, the LED light element is bent in the manner of Embodiment 1, and the PIC light element is bent in the manner of Embodiment 2.

[0075] Compared with the existing bending methods, the pin bending equipment we requested can solve the accuracy problem in the bending of electrical components at one time, eliminating the subsequent tedious correction process and the corresponding equipment for the process, eliminating the corresponding operators and equipment maintenance personnel for the process, and the electricity and gas costs for equipment operation, thereby reducing the manufacturing cost of the corresponding electrical components and improving the competitiveness of the corresponding electrical components.

[0076] In the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0077] Those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the present invention disclosed herein. The present invention is intended to cover any variation, use, or adaptation of the present invention that follows the general principles of the present invention and includes common knowledge or customary technical means in the art that are not disclosed in the present invention. The specification and examples are to be regarded as exemplary only.

[0078] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pin bending device, characterized in that: The first end of the tube pin is connected to the product head, and the second end of the tube pin is a free end; The tube pin bending equipment comprises a positioning structure, a pressing structure and a movable mold structure; The second end of the tube pin is clamped between the positioning structure and the pressing structure, the movable mold structure moves relative to the tube pin, the movable mold structure and the first end of the tube pin are against each other, and the movable mold structure is used to bend the tube pin.

2. A pin bending device according to claim 1, characterized in that: The tube pin bending equipment also includes a product groove; The product groove is arranged on the positioning structure or the pressing structure, and the product head is located in the product groove after the tube pin is bent.

3. The pin bending device according to claim 1, characterized in that: The positioning structure includes a positioning block and a positioning groove; The positioning groove is arranged on the side wall of the positioning block, and the second end of the pin is placed in the positioning groove; The depth of the positioning groove is smaller than the thickness of the pin, and the second end of the pin is pressed between the pressing structure and the positioning groove.

4. The pin bending device according to claim 1, characterized in that: The positioning structure includes a positioning block and a positioning groove; The pressing structure comprises a pressing block and a pressing edge; The positioning groove is arranged on the side wall of the positioning block, and the second end of the pin is placed in the positioning groove; The clamping edge is arranged on the side wall of the clamping block, the depth of the positioning groove is greater than the thickness of the pin, the clamping edge is inserted into the positioning groove, and the second end of the pin is clamped between the clamping edge and the positioning groove.

5. A pin bending device according to any one of claims 3 or 4, characterized in that: The positioning structure also includes a positioning piece; The pins are provided in plurality, and the plurality of pins are arranged in the positioning grooves; The end of the positioning piece is inserted between two adjacent pins.

6. A pin bending device according to claim 5, characterized in that: The positioning piece and the movable mold structure are arranged on the same side of the pin; The movable mold structure performs linear motion, and the length extension direction of the positioning piece is arranged in parallel with the running direction of the movable mold structure.

7. A pin bending device according to any one of claims 3 or 4, characterized in that: The positioning groove is provided in plurality, and the pin is provided in plurality; The positioning grooves and the pins are arranged in one-to-one correspondence.

8. The pin bending device according to claim 1, characterized in that: The movable mold structure includes a driving structure and a bending plate; The driving structure is connected to the bending plate, the bending plate and the first end of the tube pin are against each other, and the bending point of the tube pin is located on the rotation axis of the bending plate.

9. The pin bending device according to claim 8, characterized in that: The driving structure includes a driving member, a rack and a gear; The bending plate is connected to the gear, the driving member is connected to the rack, and the gear and the rack are meshingly connected.

10. The pin bending device according to claim 1, characterized in that: The bending angle of the pin is greater than 90°.

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