A stud feeder and a screw machine

Abstract

The present application discloses a stud feeder (1000) and a screw machine. The stud feeder (1000) is used to automatically supply studs (100), and comprises a housing (200), a vibration plate (300), a screening ramp (400), a direction assimilation component (500) and a storage tank (600). According to the stud feeder of the present application, the direction of the studs can be assimilated, so that the studs are arranged in a predetermined direction, which is convenient for standardized locking operations.

Description

Technical Field

[0001] The present application belongs to the technical field of screw feeding and locking, and in particular to a stud feeder for supplying studs. Background Art

[0002] The screw machine consists of a feeding system and a locking system. The feeding part is also called a screw arranging machine or a screw feeder. The screw feeder is a relatively simple automated device that arranges screws in a row to improve work efficiency. It is widely used in the electronics industry. For example, when installing and fixing circuit boards, hexagonal copper studs are usually used. Summary of the invention

[0003] The purpose of the present application is to provide a stud feeder that can assimilate the direction of the studs so that the studs are arranged in a predetermined direction, thereby facilitating standardized locking operations.

[0004] This application is implemented through the following technical solutions:

[0005] A stud feeder for automatically supplying studs, wherein the stud feeder comprises a housing, a vibrating plate, a screening ramp, a direction assimilation component and a storage tank,

[0006] The stud comprises a thread segment and a screw segment with different diameters.

[0007] The direction assimilation component includes a direction selection opening, a turning fulcrum, a first guide portion, a second guide portion and a discharge track.

[0008] The selective opening includes a first opening portion matching the screw segment, a second opening portion matching the thread segment, and a third opening portion matching the thread segment.

[0009] The second opening and the third opening are arranged at opposite ends of the first opening.

[0010] The selective opening is arranged on the outer side of the output end of the screening ramp.

[0011] The flip fulcrum is arranged below the upper surface of the direction selection opening.

[0012] The turning fulcrum is located at the center of the first opening in the front-rear direction.

[0013] The first guide portion is located below the flip fulcrum portion.

[0014] The first guide portion is located in front of the second guide portion,

[0015] The second guide portion is connected to the discharging track.

[0016] In the stud feeder, further, the first guide portion includes a first upward extending section, a first arc section and a first forward extending end, and the first upward extending section, the first arc section and the first forward extending end are connected in sequence.

[0017] In the stud feeder, further, the second guide portion includes a second upwardly extending section, a second arc section and a second forwardly extending end, and the second upwardly extending section, the second arc section and the second forwardly extending end are connected in sequence.

[0018] In the stud feeder, further, the distance between the first upwardly extending section and the second upwardly extending section in the front-to-rear direction is greater than half the length of the stud.

[0019] In the stud feeder, further, the distance between the first upwardly extending section and the second upwardly extending section in the front-to-rear direction is smaller than the sum of the length of the thread section and the length of the screw section.

[0020] In the stud feeder, further, the second upwardly extending section is located behind the third opening portion.

[0021] In the stud feeder, further, the studs are hexagonal copper studs or steel studs.

[0022] In the stud feeder, further, upstream of the storage trough, a stopper is provided on the discharge track for preventing the stud from tilting prematurely.

[0023] In the stud feeder, further, the screening ramp has a first screening section connected to the selection opening and a second screening section connected to the first screening section, the width of the first screening section is smaller than the width of the second screening section, the width of the first screening section is 1.1 to 1.3 times the diameter of the inscribed circle of the screw segment of the stud; the width of the second screening section is more than 1.5 times the diameter of the inscribed circle of the screw segment of the stud.

[0024] On the other hand, the present application also provides a screw machine, which includes the stud feeder.

[0025] The beneficial effect of the present application is that the stud feeder of the present application includes a shell, a vibration plate, a screening ramp, a direction assimilation component and a storage trough, which can assimilate the direction of the studs so that the studs are arranged in a certain direction, which is convenient for standardized locking operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the appearance of a stud feeder according to one embodiment of the present application;

[0027] Figure 2 yes Figure 1 Schematic diagram of the internal structure of the stud feeder;

[0028] Figure 3 yes Figure 1 Another structural schematic diagram of a stud feeder;

[0029] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0030] Figure 5 yes Figure 1 A schematic cross-sectional view of a directional assimilation assembly of a stud feeder;

[0031] Figure 6 It is used to illustrate Figure 1 A schematic diagram of the working principle of the direction assimilation assembly of the stud feeder;

[0032] Figure 7 It is used to illustrate Figure 1 A schematic diagram of the working principle of the first guide part of the stud feeder;

[0033] Figure 8 It is used to illustrate Figure 1 A schematic diagram of the working principle of the second guide portion of the stud feeder;

[0034] Fig. 9 yes Figure 1 Another three-dimensional structural schematic diagram of the stud feeder;

[0035] Fig.10 for Fig. 9 Enlarged view of point B in the middle;

[0036] Fig.11 It is a front view of the stud, used to show the composition of the stud and the diameter of the inscribed circle of the screw section of the stud;

[0037] Fig.12 for Fig. 9 The enlarged view at point C in the middle is used to show the width of the first screening section and the width of the second screening section of the screening ramp.

[0038] The meanings of the numbers in the figure are as follows:

[0039] 100-stud; 110-screw segment; 120-screw segment; 200-housing; 300-vibration plate; 400-screening ramp; 410-first screening segment; 420-second screening segment; 500-directional assimilation assembly; 510-selective opening; 511-first opening portion; 512-second opening portion; 513-third opening portion; 520-flip fulcrum portion; 530-first guide portion; 531-first upward extension segment; 532-first arc segment; 533-first forward extension end; 540-second guide portion; 541-second upward extension segment; 542-second arc segment; 543-second forward extension end; 550-discharging track; 600-storage trough; 610-stop portion; 700-monitoring portion; 1000-stud feeder. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0041] According to the research and development personnel of the applicant, the stud feeders currently on the market generally feed the studs in a vertical position with the thread segments facing downward. When the studs are arranged from the disordered state in the vibration plate to the vertical state, two arrangement states are generated: one with the thread segments facing downward and the other with the thread segments facing upward. This feeding method is not convenient for subsequent standardized locking operations.

[0042] In view of the above problems, the inventor has made great efforts to innovate and proposed a stud feeder, which can assimilate the direction of the studs so that the studs can be arranged in a certain direction, which is convenient for subsequent standardized locking operations.

[0043] like Figure 1-10 As shown, the stud feeder 1000 of this embodiment is used to automatically supply studs 100. The stud feeder 1000 includes a housing 200, a vibration plate 300, a screening ramp 400, a direction assimilation component 500 and a storage tank 600.

[0044] Among them, Fig.11As shown, the stud 100 includes a thread segment 110 and a screw segment 120 with different diameters. The outer diameter of the thread segment 110 is smaller than the diameter Da of the inscribed circle of the screw segment 120.

[0045] like Figures 3 to 10 As shown, the direction assimilation component 500 includes a direction selection opening 510 , a turning fulcrum portion 520 , a first guide portion 530 , a second guide portion 540 and a discharge track 550 .

[0046] Specifically, the selective opening 510 includes a first opening portion 511 matched with the screw segment 120 , a second opening portion 512 matched with the thread segment 110 , and a third opening portion 513 matched with the thread segment 110 .

[0047] The second opening 512 and the third opening 513 are disposed at two ends of the first opening 511 opposite to each other.

[0048] like Figures 1 to 5 As shown, the directional selection opening 510 is arranged on the circumferential outer side of the output end of the screening ramp 400 .

[0049] like Figure 6 As shown, the flip fulcrum portion 520 is disposed below the upper surface of the direction selection opening 510 .

[0050] Specifically, Figure 6 As shown, the flip fulcrum portion 520 is located at the center of the first opening portion 511 in the front-to-back direction.

[0051] like Figures 6 to 8 As shown, the first guide portion 530 is located below the flip fulcrum portion 520. The first guide portion 530 is located in front of the second guide portion 540. The second guide portion 540 is connected to the discharge track 550.

[0052] The stud 100 includes a thread segment 110 and a screw segment 120 with different diameters. When the thread segment has a diameter greater than or less than the screw segment, the direction assimilation component 500 distinguishes the thread segment 110 and the screw segment 120 of the stud 100, so that the stud 100 can be arranged in the same direction.

[0053] In general, in this embodiment, the stud 100 is subjected to vibration in the vibration plate 300, so that the stud 100 moves along the screening ramp 400 connected to the vibration plate 300, and reaches the direction assimilation assembly 500 outside the output end of the screening ramp 400. And under the action of vibration, the stud 100 moves to the direction selection opening 510 of the direction assimilation assembly 500. In addition, in this embodiment, as described later, the screening ramp has a first screening section connected to the direction selection opening and a second screening section connected to the first screening section, the width of the first screening section is smaller than the width of the second screening section, and the first screening section of the screening ramp 400 only allows a single stud 100 to pass through.

[0054] Since the direction selection opening 510 is provided with a first opening portion 511 matching with the screw segment 120, a second opening portion 512 matching with the thread segment 110, and a third opening portion 513 matching with the thread segment 110, and the second opening portion 512 and the third opening portion 513 are respectively provided at both ends of the first opening portion 511, when the stud 100 moves to the direction selection opening 510, no matter the thread segment 110 of the stud 100 faces forward or backward, it can fall into the direction selection opening 510.

[0055] Since a flip fulcrum portion 520 is provided at the center of the first opening portion 511 on the selection opening 510 in the front-to-back direction (the location that divides the first opening portion 511 into two equal parts in the front-to-back direction), when the stud 100 moves to the selection opening 510, the flip fulcrum portion 520 causes the stud 100 to rotate and tilt, and fall into the corresponding guide portion (the first guide portion 530 or the second guide portion 540).

[0056] In one embodiment, the flip fulcrum 520 is a thin wire that crosses the center of the first opening 511 in the front-to-back direction, and its function is to make the stud 100 receive uneven gravity in the front-to-back direction, so that the selective opening 510 rotates and tilts. Of course, the flip fulcrum 520 can also be composed of a thin rope or a convex point.

[0057] When the stud 100 enters the selective opening 510 with the thread segment 110 facing forward, Figure 7 As shown. Under the action of gravity, the stud 100 rotates at the turning fulcrum 520, and the screw thread segment 110 falls forward toward the first guide portion 530 below the directional opening 510. At this time, under the action of gravity, the stud 100 falls along the first upward extending segment 531, the first arc segment 532 and the first forward extending end 533 on the first guide portion 530 until it falls on the discharge track 550. At this time, the stud 100 moves on the discharge track 550 with the screw thread segment 110 facing forward.

[0058] When the stud 100 enters the selective opening 510 with the thread segment 110 facing backward, Figure 8 As shown. Under the action of gravity, the stud 100 rotates at the flip fulcrum 520 and falls to the second guide portion 540 below the directional opening 510. Since the gap between the first guide portion 530 and the second guide portion 540 is smaller than the length of the stud 100, the stud 100 cannot fall directly onto the second guide portion 540. At this time, the thread segment 110 of the stud 100 contacts the second arc segment 542 on the second guide portion 540, and the screw segment 120 contacts the top of the first upwardly extending segment 531 on the first guide portion 530. As the vibration disk 300 vibrates, the thread segment 110 of the stud 100 slides along the second arc segment 542, so that the stud 100 moves on the discharge track 550 with the thread segment 110 facing forward without getting stuck. At this point, the direction of the stud 100 is assimilated.

[0059] like Figure 5-8 As shown, the first guide portion 530 includes a first upwardly extending section 531, a first arc-shaped section 532 arched backward, and a first forwardly extending end 533, and the first upwardly extending section 531, the first arc-shaped section 532, and the first forwardly extending end 533 are connected in sequence. The second guide portion 540 includes a second upwardly extending section 541, a second arc-shaped section 542 arched backward, and a second forwardly extending end 543, and the second upwardly extending section 541, the second arc-shaped section 542, and the second forwardly extending end 543 are connected in sequence. The distance between the first upwardly extending section 531 and the second upwardly extending section 541 in the front-to-back direction is greater than half of the length of the stud 100, that is, the sum of the length of the thread segment 110 and half of the length of the screw segment 120. The distance between the first upwardly extending section 531 and the second upwardly extending section 541 in the front-to-back direction is less than the sum of the length of the thread segment 110 and the length of the screw segment 120. The second upwardly extending section 541 is located behind the third opening 513.

[0060] The upper end of the first upward extension section 531 is located directly below the flip fulcrum 520, and the distance between the first upward extension section 531 and the flip fulcrum 520 is less than the length of the screw segment 110 plus half the length of the screw segment 120, so as to prevent the stud 100 from being deflected at the first upward extension section 531. At the same time, the angle between the first forward extension end 533 and the horizontal is 45 degrees. The distance between the lower end of the first forward extension end 533 and the discharge track 550 is less than the length of the screw segment 110 plus half the length of the screw segment 120, so as to prevent the stud 100 from being deflected at the first forward extension end 533; at the same time, the distance between the lower end of the first forward extension end 533 and the discharge track 550 is greater than the maximum diameter of the stud 100, so that the stud 100 falling from the second guide portion 540 can be transported forward along the discharge track 550.

[0061] At the same time, the second upwardly extending section 541 of the second guide portion 540 is located behind the third opening portion 513 to prevent the upper end of the second upwardly extending section 541 from being caught by the stud 100 falling from the directional opening 510 .

[0062] In addition, in this embodiment, the distance between the first upward extending section 531 and the second upward extending section 541 in the front-to-back direction, and the radius difference between the first arc section 532 and the second arc section 542 in the concentric direction are both smaller than the sum of the length of the thread segment 110 and the length of the screw segment 120. When the stud 100 falls from the direction selection opening 510 with the thread segment 110 facing backward, the thread segment 110 first contacts the second guide portion 540. At this time, if the distance between the first upward extending section 531 and the second upward extending section 541 in the front-to-back direction, or the radius difference between the first arc section 532 and the second arc section 542 in the concentric direction, is greater than the sum of the length of the thread segment 110 and the length of the screw segment 120, it is possible that the stud 100 enters the discharge track 550 with the thread segment 110 facing backward, thereby failing to achieve the effect of reversing. Therefore, the distance between the first upwardly extending section 531 and the second upwardly extending section 541 in the front-to-back direction, and the radius difference between the first arc section 532 and the second arc section 542 in the concentric circle direction must be smaller than the sum of the length of the thread section 110 and the length of the screw section 120, so as to ensure that the stud 100 achieves the effect of reversing when falling toward the second guide portion 540.

[0063] Although the structures of the first guide portion 530 and the second guide portion 540 are described by way of example, the present application is not limited thereto. For example, the first guide portion 530 and the second guide portion 540 may also adopt smooth inclined planes, smooth curved pipes, or various geometric component combinations, as long as the corresponding guiding function can be achieved.

[0064] In this embodiment, the second forward extending end 543 is connected to the second arc segment 542 and the discharge track 550 .

[0065] like Figure 2 , 7 As shown, the stud 100 is a hexagonal copper stud 100. In some other embodiments, the stud 100 may also be a stud with thread segments of other shapes and screw segments with different diameters.

[0066] like Fig. 9 , Fig.10 As shown, upstream of the material storage trough 600 , a stopper 610 for preventing the stud 100 from tilting is provided on the discharge track 550 , so that the stud 100 can smoothly enter the material storage trough 600 .

[0067] In this embodiment, after the studs 100 are placed on the vibration plate 300 of the stud feeder 1000 , the studs 100 move along the screening ramp 400 as the vibration plate 300 vibrates.

[0068] In this embodiment, the track cross section at the input end of the screening ramp 400 can accommodate two or more studs 100 passing through at the same time, and the track cross section at the output end connected to the selection opening 510 can only accommodate one stud 100 passing through.

[0069] Specifically, if Figures 9 to 12 As shown, the screening ramp 400 has a first screening section 410 connected to the direction selection opening 510 and a second screening section 420 connected to the first screening section 410. The width of the first screening section 410 is smaller than the width of the second screening section 420. Moreover, the width Dc of the first screening section 410 is 1.1 to 1.3 times the diameter Da of the inscribed circle of the screw section 120 of the stud 100; the width Db of the second screening section 420 is more than 1.5 times the diameter Da of the inscribed circle of the screw section 120 of the stud 100.

[0070] In a specific application example, the width Dc of the first screening section 410 is 1.1 times the diameter Da of the inscribed circle of the screw section 120 of the stud 100, so as to ensure that only one stud 100 can pass through the same position on the first screening section 410 at the same time, so as to ensure smooth feeding of the downstream selective opening 510. In addition, the total length of the first screening section 410 is more than 10 times the length of the stud 100. In addition, the width Db of the second screening section 420 is more than 1.6 times the diameter Da of the inscribed circle of the screw section 120 of the stud 100, so as to keep enough studs 100 on the second screening section 420 to achieve a higher feeding rate.

[0071] Of course, a plurality of screening sections with larger widths may be provided upstream of the second screening section 420 .

[0072] During the feeding process, when the studs are connected end to end, there is a risk that the thread segment will enter the screw hole set at the tail of the screw segment and cause a wrong connection. By setting a first screening segment 410 and a second screening segment 420 connected to the first screening segment 410, by limiting the width Dc of the first screening segment 410, and cooperating with the arc-shaped inner wall of the vibration plate 300, it is ensured that the center lines of the two adjacent studs are arranged at a certain angle and will not be aligned in a straight line, and the thread segment will not enter the screw hole set at the tail of the screw segment, so that the end-to-end connection of the yin and yang studs (the end-to-end connection between two or more studs) can be avoided and screened.

[0073] After the stud 100 enters the direction selection opening 510 along the screening ramp 400, under the action of the flip fulcrum 520, the stud 100 falls from the opening to the first guide portion 530 or the second guide portion 540, and then reaches the discharge track 550 with the thread segment arranged forward. Under the action of vibration, the stud 100 moves along the discharge track 550 to the storage trough 600. Since a stopper 610 is provided at the junction of the discharge track 550 and the storage trough 600, it can prevent the stud 100 from tilting and rotating when entering the storage trough 600 from the discharge track 550, thereby affecting the direction of the thread segment of the stud 100. Therefore, the stud 100 can enter the storage trough 600 in the same posture.

[0074] In this embodiment, the storage tank 600 is connected to the nail feeding device, which is used to transfer the studs 100, thereby completing the feeding process of the studs 100. After the studs 100 are fed, the screw locking operation can be performed. Since the studs 100 can enter the storage tank 600 in the same posture, it is convenient for standardized stud locking operations.

[0075] It should be noted that, in this embodiment, the stud feeder 1000 is also provided with a monitoring unit 700, such as Figure 3 , 9 As shown. The monitoring unit 700 is used to monitor the amount of studs 100 in the vibration plate 300. When the vibration plate 300 is empty or low in material, an alarm can be sounded to remind you to add material. This improves the continuous operation capacity of the stud feeder 1000. The monitoring unit 700 can be implemented using a proximity sensor commonly used in the art, and its implementation principle is well known to the public and will not be described in detail here.

[0076] On the other hand, the present application also provides a screw machine, which includes the stud feeder.

[0077] In the description of the present application, in addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0078] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances. In addition, in the description of this application, unless otherwise specified, "plurality" means two or more.

[0079] In the description of the embodiments of the present application, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0080] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0081] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0082] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A stud feeder (1000) for automatically supplying studs, characterized in that: The stud feeder (1000) comprises a housing (200), a vibrating plate (300), a screening ramp (400), a direction assimilation assembly (500) for studs, and a storage trough (600); The stud (100) comprises a thread segment (110) and a screw segment (120) having different diameters; The direction assimilation component (500) comprises a direction selection opening (510), a turning fulcrum portion (520), a first guide portion (530), a second guide portion (540) and a discharge track (550); wherein the direction selection opening (510) comprises a first opening portion (511) matching the screw segment (120), a second opening portion (512) matching the screw tooth segment (110) and a third opening portion (513) matching the screw tooth segment (110), the second opening portion (512) and the third opening portion (513) being arranged at two ends of the first opening portion (511) in a relative manner, and the direction selection opening (510) is arranged on the outer side of the output end of the screening inclined track (400); The flip fulcrum portion (520) is arranged below the upper surface of the direction selection opening (510), and the flip fulcrum portion (520) is located at the center of the first opening portion (511) in the front-rear direction; The first guide portion (530) comprises a first upwardly extending section (531), a first arc-shaped section (532) and a first forwardly extending end (533), wherein the first upwardly extending section (531), the first arc-shaped section (532) and the first forwardly extending end (533) are connected in sequence; the first guide portion (530) is located below the flip fulcrum portion (520), and the first guide portion (530) is located in front of the second guide portion (540); The second guide portion (540) comprises a second upwardly extending section (541), a second arc-shaped section (542) and a second forwardly extending end (543), the second upwardly extending section (541), the second arc-shaped section (542) and the second forwardly extending end (543) are connected in sequence, and the second guide portion (540) is connected to the discharge track (550); A gap between the first guide portion and the second guide portion is smaller than a length of the stud.

2. The stud feeder (1000) according to claim 1, characterized in that: The distance between the first upwardly extending section (531) and the second upwardly extending section (541) in the front-to-rear direction is greater than half the length of the stud (100).

3. The stud feeder (1000) according to claim 2, characterized in that: The distance between the first upwardly extending section (531) and the second upwardly extending section (541) in the front-to-rear direction is less than the sum of the length of the thread section (110) and the length of the screw rod section (120).

4. The stud feeder (1000) according to claim 3, characterized in that: The second upwardly extending section (541) is located behind the third opening portion (513).

5. The stud feeder (1000) according to claim 1, characterized in that: The stud (100) is a hexagonal copper stud.

6. The stud feeder (1000) according to claim 1, characterized in that: A stopper (610) for preventing the stud (100) from tilting is provided on the discharge track (550) upstream of the material storage trough (600).

7. The stud feeder (1000) according to claim 1, characterized in that: The screening inclined rail (400) comprises a first screening section (410) connected to the directional selection opening (510) and a second screening section (420) connected to the first screening section (410); the width of the first screening section (410) is smaller than the width of the second screening section (420); the width (Dc) of the first screening section (410) is 1.1 to 1.3 times the diameter (Da) of the inscribed circle of the screw section (120) of the stud (100); and the width (Db) of the second screening section (420) is more than 1.5 times the diameter (Da) of the inscribed circle of the screw section (120) of the stud (100).

8. A screw machine, characterized in that Comprising the stud feeder (1000) described in claim 1.

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