Workstation device and corresponding horizontal plug-in machine

Abstract

The present application relates to a kind of workbench device and corresponding horizontal plug-in machine, which includes rack, workbench device, driving device, conveying device, jumper device and head plug-in device.The disc of workbench device is movably arranged on the rack, and the disc is provided with plug-in conveying unit for conveying circuit board.The conveying device conveys circuit board to workbench device.Jumper device conveys jumper, and head plug-in device cuts off jumper and presses into circuit board, and base shear leg device shears leg of component.The output shaft of disc driving motor is connected with driving wheel, and a plurality of driven wheels are arranged at the periphery of disc and are in extrusion connection with disc.One end of belt is connected with driving wheel, and a plurality of driven wheels are arranged at the inner side of belt at intervals.By controlling the rotation angle of disc driving motor, the rotation angle of disc is controlled, so that the disc can rotate at any angle, which greatly improves compatibility and plug-in efficiency.

Description

[0001] This application is a divisional application. The original application has the application number "202210836011.8" and the application date is "July 15, 2022". The invention title is "Horizontal Insertion Machine". Technical Field

[0002] This invention relates to the field of automatic insertion machine equipment, and particularly to a workbench device and a corresponding horizontal insertion machine. Background Technology

[0003] With the rapid development of electronic technology, electronic products are being used more and more widely, and component insertion machines are essential equipment for manufacturing electronic products. Currently, the worktable of component insertion machines on the market can only rotate 90° at a time, resulting in poor compatibility of component orientation and low insertion efficiency.

[0004] Therefore, it is necessary to provide a workbench device and a corresponding horizontal insertion machine to solve the above problems. Summary of the Invention

[0005] This invention relates to a workbench device and a corresponding horizontal insertion machine. The horizontal insertion machine uses a disc drive motor, a drive wheel, and a belt to drive multiple driven wheels to rotate. The driven wheels are fixedly connected to the disc, thereby driving the disc to rotate. The rotation angle of the disc can be controlled by controlling the rotation angle of the disc drive motor, allowing the disc to rotate at any angle. This greatly improves compatibility and insertion efficiency, solving the problem in existing insertion machines where the workbench can only rotate 90° at a time, resulting in poor insertion orientation compatibility and low efficiency.

[0006] To solve the above problems, the present invention provides a workbench device, which includes a disc and a drive device. The disc is movably mounted on a frame, and a plug-in conveying unit is provided on the disc for conveying circuit boards. The drive device includes a disc drive unit for driving the workbench device to rotate at any angle.

[0007] The disc drive unit includes a disc drive motor, a drive pulley, a belt, multiple driven pulleys, an adjusting plate, and two adjusting pulleys. The output shaft of the disc drive motor is connected to the drive pulley. The multiple driven pulleys are spaced apart around the periphery of the disc and are press-fitted to the disc. One end of the belt is connected to the drive pulley, and multiple driven pulleys are spaced apart on the inner side of the belt. The rotation angle of the disc is controlled by controlling the rotation angle of the disc drive motor. The adjusting plate is fixedly mounted on the frame and has two adjusting slots arranged side by side. One adjusting pulley corresponds to one adjusting slot, and the adjusting pulley is bolted to the adjusting plate to adjust the distance between the two adjusting pulleys. The outer side of the belt is press-fitted to the adjusting pulleys and is located between the two adjusting pulleys. The tension of the belt is adjusted by adjusting the distance between the two adjusting pulleys.

[0008] In this invention, the two ends of the plug-in conveying unit are respectively provided with a left connecting unit and a right connecting unit. The circuit board is conveyed from the left connecting unit to the plug-in conveying unit. The plug-in conveying unit conveys the circuit board to a set position for plug-in operation. After the plug-in operation is completed, the plug-in conveying unit conveys the circuit board to the right connecting unit.

[0009] In this invention, the worktable device further includes an X-axis worktable and a Y-axis worktable; the driving device further includes an X-axis drive motor, two X-axis guide rails, a Y-axis drive motor, and two Y-axis guide rails; the two Y-axis guide rails are disposed at both ends of the frame, the lower end of the Y-axis worktable is slidably connected to the two Y-axis guide rails, and the Y-axis drive motor is fixedly connected to the Y-axis worktable for driving the Y-axis worktable to reciprocate along the Y-axis guide rails; the two X-axis guide rails are disposed on the upper surface of the Y-axis worktable, the lower end of the X-axis worktable is slidably connected to the two X-axis guide rails, and the upper end face of the X-axis worktable is connected to the disk; the X-axis drive motor is fixedly connected to the X-axis worktable for driving the X-axis worktable and the disk to slide along the X-axis guide rails.

[0010] The worktable device further includes an annular guide rail, which is disposed below the disc and fixedly mounted on the X-axis worktable. An annular groove is provided on the outer circumference of the annular guide rail. A positioning wheel is also provided at the lower end of the driven wheel. The side of the positioning wheel is located in the groove, and the end of the upper surface of the positioning wheel is pressed and connected to the upper side wall of the groove.

[0011] Furthermore, the positioning wheel is hollow inside, and a first limiting groove is provided on the inner side wall of the positioning wheel, with at least one set of the first limiting groove; the positioning wheel is also provided with a plurality of steel balls and studs, with one end of the plurality of steel balls located in the first limiting groove; one end of the stud is provided with a second limiting groove corresponding to the first limiting groove, and the other end of the plurality of steel balls is located in the second limiting groove, for fixing the stud to the positioning wheel; the other end of the stud passes through the positioning wheel, the driven wheel and connects to the disc in sequence.

[0012] In addition, both the X-axis worktable and the Y-axis worktable have through holes in their middle parts to provide working space. A protective shell is provided on the outer periphery of the annular guide rail. The upper end of the protective shell is pressed against the upper surface end of the disk, and the lower end of the protective shell is screwed to the X-axis worktable.

[0013] In this invention, the outer periphery of the driving pulley is provided with a first straight tooth, and the inner side of the belt is provided with a second straight tooth, the first straight tooth and the second straight tooth being meshed and connected; the driven pulley is provided with a third straight tooth, the third straight tooth being meshed and connected with the second straight tooth.

[0014] The present invention also includes a horizontal insertion machine that uses the workbench device. The horizontal insertion machine further includes a jumper device disposed on the workbench device and a head insertion device mounted on the frame. The two sets of jumper devices are respectively disposed on both sides of the head insertion device.

[0015] In this invention, the jumper device includes a fixing unit, a traction unit, and a straightening unit. The fixing unit is fixedly connected to the head plug device. The traction unit is located on the side of the fixing unit near the head plug device and is used to drive the jumper to move. The straightening unit is located at the end of the traction unit away from the head plug device and is used to center and level the jumper.

[0016] The fixing unit includes a fixing block, a connecting block, a bearing seat, a jumper box aluminum block, a first aluminum block, and a second aluminum block; the traction unit includes a servo motor, a straightening jumper connecting block, a first jumper gear, and a second jumper gear; the straightening unit includes a horizontal straightening component and a vertical straightening component; the horizontal straightening component includes a roller fixing block and multiple first small wheels; the vertical straightening component includes a roller seat and multiple second small wheels.

[0017] The fixing block is fixed to the head tool holder of the head insertion device by bolts. One end of the connecting block is connected to the fixing block, and the other end of the connecting block is connected to the bearing seat. One end of the bearing seat is connected to the jumper box aluminum block. The second aluminum block is provided with a second through groove. The second aluminum block is located at the end of the first gap away from the straightening unit, and is used to guide the jumper to the head insertion device. The second aluminum block is fixed above one end of the jumper box aluminum block. The second jumper gear is fixed above the other end of the jumper box aluminum block. The first aluminum block is provided with a first through groove. The first aluminum block is located at the end of the straightening unit away from the servo motor, and the first aluminum block is fixed at the end of the roller seat. The jumper passes through the first through groove and is used to guide the jumper into the straightening unit.

[0018] The servo motor is mounted on the bearing housing. The first jumper gear is fitted on the outer circumference of the output shaft of the servo motor. The second jumper gear is located on one side of the first jumper gear, and the first jumper gear and the second jumper gear are meshed together. A first gap is provided between the upper end of the first jumper gear and the upper end of the second jumper gear. The jumper wire is located in the first gap and is in close contact with the upper ends of the first jumper gear and the second jumper gear. The servo motor drives the first jumper gear to rotate, and the first jumper gear drives the second jumper gear to rotate. The straightened jumper wire connecting block is mounted on the roller fixing block and the bearing housing, and is used to guide the straightened jumper wire into the traction unit.

[0019] One end of the roller fixing block is connected to the bearing seat. The roller fixing block is horizontally arranged. The upper surface of the roller fixing block is provided with a plurality of first small wheels. The plurality of first small wheels are arranged in two groups. A second gap is provided between the outer circumferences of the two groups of first small wheels. The second gap and the first gap are located on the same horizontal line.

[0020] The roller seat is located at the end of the roller fixing block away from the servo motor. The side of the roller seat is provided with a mounting surface, which is perpendicular to the upper surface of the roller fixing block. A plurality of second small wheels are provided on the mounting surface, and the plurality of second small wheels are arranged in two groups. A third gap is provided between the two groups of second small wheels, and the third gap and the second gap are located on the same horizontal line.

[0021] Furthermore, the first small wheel is set to 7, with 4 in one group and 3 in another group. The first small wheels in one group are staggered with the first small wheels in the other group to extend the shaping path.

[0022] There are 7 second small wheels, 4 of which are provided at the lower end of the mounting surface and 3 of which are provided at the upper end of the mounting surface. The second small wheels at the upper end are staggered with the second small wheels at the lower end to extend the shaping path.

[0023] This invention, employing the aforementioned horizontal insertion machine, offers the following advantages compared to existing technologies: The invention relates to a horizontal insertion machine comprising a frame, a worktable assembly, a drive unit, a conveying unit, a jumper wire assembly, and a head insertion assembly. The worktable assembly is mounted on the frame and includes a disc movably mounted on the frame. A insertion conveying unit is mounted on the disc for conveying circuit boards. The conveying unit transports the circuit boards onto the worktable assembly. The jumper wire assembly is mounted on the worktable assembly for conveying jumper wires. The head insertion assembly is mounted on the frame and located to one side of the jumper wire assembly, for cutting and pressing the jumper wires conveyed by the jumper wire assembly onto the circuit board. A base clipping device is located below the head assembly for clipping the leads of components inserted into the circuit board. The drive unit includes a disc drive unit for driving the worktable assembly to rotate at any angle. The disc drive unit includes a disc drive motor, a drive wheel, a belt, and multiple driven wheels. The output shaft of the disc drive motor is connected to the drive pulley, and multiple driven pulleys are spaced apart around the periphery of the disc and pressed against it. One end of a belt is connected to the drive pulley, and multiple driven pulleys are spaced apart on the inner side of the belt. By controlling the rotation angle of the disc drive motor, the rotation angle of the disc can be controlled, allowing the disc to rotate at any angle. This greatly improves compatibility and insertion efficiency, solving the problem of poor insertion orientation compatibility and low efficiency caused by the fact that the worktable of the insertion machine can only rotate 90° at a time in the existing technology. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments are briefly introduced below. The drawings described below are only the corresponding drawings of some embodiments of the present invention.

[0025] Figure 1 This is a schematic diagram of the structure of an embodiment of the horizontal insertion machine of the present invention.

[0026] Figure 2 This is an exploded structural diagram of an embodiment of the horizontal insertion machine of the present invention.

[0027] Figure 3 This is a schematic diagram of an embodiment of the layout of two jumper devices in the horizontal insertion machine of the present invention.

[0028] Figure 4 This is a schematic diagram of an embodiment of the connection structure between the workbench device and the drive device of the horizontal insertion machine of the present invention.

[0029] Figure 5 This is a schematic diagram of the structure of an embodiment of the X-axis worktable of the horizontal insertion machine of the present invention.

[0030] Figure 6 This is a schematic diagram of an embodiment of the driven wheel and positioning wheel of the horizontal insertion machine of the present invention.

[0031] Figure 7 for Figure 6 AA cross-section view.

[0032] Figure 8 This is a schematic diagram of a structure of a jumper device for a horizontal insertion machine according to the present invention.

[0033] Figure 9 This is a schematic diagram of the structure of a first embodiment of the head insertion device of the horizontal insertion head of the present invention.

[0034] Figure 10 This is an exploded view of a first embodiment of the head insertion device of the horizontal insertion head of the present invention.

[0035] Figure 11 This is a schematic diagram of a first embodiment of the tool assembly drive component of the horizontal insert head of the present invention.

[0036] Figure 12 This is a schematic diagram of the structure of a first embodiment of the blade box of the horizontal insert head of the present invention.

[0037] Figure 13 This is a schematic diagram of the structure of a first embodiment of the horizontal plug-in connector of the present invention.

[0038] Figure 14 This is a schematic diagram of the tool holder of the horizontal insert head of the present invention.

[0039] Figure 15 This is a side view of a first embodiment of the blade assembly unit of the horizontal insert head of the present invention.

[0040] Figure 16 for Figure 12 An enlarged schematic diagram.

[0041] Figure 17 This is a schematic diagram of the internal structure of the horizontal plug-in head according to a first embodiment of the present invention.

[0042] Figure 18 This is a schematic diagram of the tool holder of the horizontal insert head of the present invention.

[0043] Figure 19 This is a schematic diagram of the structure of a first embodiment of the forming blade of the horizontal insert head of the present invention.

[0044] In the diagram: 10. Horizontal insertion machine; 20. Frame; 21. Crossbeam; 30. Worktable device; 31. Disc; 32. Circular guide rail; 321. Groove; 33. X-axis worktable; 34. Y-axis worktable; 35. Insertion conveying unit; 40. Drive device; 41. Disc drive unit; 411. Disc drive motor; 412. Drive wheel; 413. Driven wheel; 414. Positioning wheel; 4141. First limit groove; 4142. Steel ball; 4143. Stud; 4144. Second limit groove; 415. Adjusting plate; 416. Adjusting wheel. 42. X-axis drive motor; 43. X-axis guide rail; 44. Y-axis drive motor; 45. Y-axis guide rail; 50. Jumper device; 511. Fixing block; 512. Connecting block; 513. Bearing seat; 514. Jumper box aluminum block; 515. First aluminum block; 516. Second aluminum block; 521. Servo motor; 522. Straight jumper connecting block; 523. First jumper gear; 524. Second jumper gear; 531. Roller fixing block; 532. First small wheel; 533. Roller seat; 534. Second small wheel; 60. Head insertion device; 61. Head. 611. Support bracket; 62. Guide rail; 62. Tool set drive unit; 621. Tool set drive assembly; 6211. Motor; 6212. Synchronous pulley; 6213. Driven pulley; 6214. Belt; 6215. Transmission gear shaft; 6216. Z-axis rack; 6217. Rotating rod; 6218. Connector; 622. Tool holder; 6221. Frame; 6222. Fixing plate; 6223. Weight reduction hole; 6224. First groove; 6225. Second groove; 6226. Slot; 623. Tool box; 6231. Box cover; 6232. Box frame; 6 233. Adjusting bracket, 624. First ball bearing box, 625. Second ball bearing box, 626. Connector cover, 63. Blade assembly unit, 631. Cutting blade, 632. Forming blade, 6321. Recessed groove, 633. Push blade, 634. First support frame, 6341. First through hole, 635. Second support frame, 6351. Second through hole, 636. Forming blade, 637. Lower curved blade, 638. V-shaped groove, 70. Conveying device, 71. Left connecting unit, 72. Right connecting unit, 80. U-axis adjusting device, 90. Base shearing device. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] The directional terms mentioned in this invention, such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", "top" and "bottom", are only for reference to the orientation of the accompanying drawings. The directional terms used are for the purpose of explaining and understanding this invention, and are not intended to limit this invention.

[0047] In the diagram, units with similar structures are represented by the same labels.

[0048] Please refer to Figure 1 , Figure 2 , Figure 3 In this embodiment, the horizontal insertion machine 10 includes a frame 20, a worktable device 30, a drive device 40, a jumper device, a head insertion device 60, a conveying device 70, a U-axis adjustment device 80, and a base shearing device 90. A crossbeam 21 is provided at the upper end of the frame 20, and the head insertion device 60 is mounted on the crossbeam 21. Two sets of jumper devices are respectively located on the left and right sides of the head insertion device 60. The U-axis adjustment device 80 is mounted on the crossbeam 21, with its upper end connected to the head insertion device 60 and its lower end connected to the base shearing device 90. During adjustment, the head insertion device 60 and the base shearing device 90 can be adjusted synchronously. The U-axis adjustment device 80 adjusts the forward and reverse spiral screws to drive the left and right tool holders to move relative to each other, thereby adjusting the span between the left and right tool holders. The span is calculated based on the distance between the two forming blades. The worktable device 30 is located at the upper end of the frame 20 and below the head insertion device 60. The base trimming device 90 is mounted on the frame 20 and located below the workbench device 30. It is used to trim the leads of components after insertion.

[0049] In this embodiment, please refer to Figure 2 , Figure 4 , Figure 5 The worktable device 30 includes a disc 31, an annular guide rail 32, an X-axis worktable 33, and a Y-axis worktable 34. Each of the disc 31, the X-axis worktable 33, and the Y-axis worktable 34 has a through hole in its center to provide working space. The Y-axis worktable 34 is slidably connected to the Y-axis guide rail 45 on the frame 20, and the X-axis worktable 33 is slidably connected to the X-axis guide rail 43 on the Y-axis worktable 34. The annular guide rail 32 is fixedly mounted on the X-axis worktable 33, and an annular groove 321 is provided on the outer circumference of the annular guide rail 32. The disc 31 is positioned above the annular guide rail 32 via multiple driven wheels 413. A protective shell is provided on the outer circumference of the annular guide rail 32. The upper end of the protective shell presses against the upper surface of the disc 31, and the lower end of the protective shell is screwed to the X-axis worktable 33, facilitating the protection of the belt and driven wheels 413 and preventing water or dust from affecting the belt's rotation of the driven wheels 413.

[0050] A component conveying unit 35 is mounted on the upper surface of the disc 31. The conveying device 70 includes a left connecting unit 71 and a right connecting unit 72, which have identical structures. The left connecting unit 71 and the right connecting unit 72 are respectively located at opposite ends of the component conveying unit 35. Circuit boards are conveyed from the left connecting unit 71 to the component conveying unit 35, which then conveys the circuit boards to a designated position for component insertion. After insertion is completed, the component conveying unit 35 conveys the circuit boards to the right connecting unit 72, which then conveys them to the next process step.

[0051] In this embodiment, please refer to Figure 4 , Figure 5 The drive unit 40 is used to drive the worktable device 30 to rotate at any angle. It includes a disk drive unit 41, an X-axis drive motor 42, two X-axis guide rails 43, a Y-axis drive motor 44, and two Y-axis guide rails 45. The two Y-axis guide rails 45 are located at both ends of the frame 20. The lower end of the Y-axis worktable 34 is slidably connected to the two Y-axis guide rails 45. The Y-axis drive motor 44 is fixedly connected to the Y-axis worktable 34 and is used to drive the Y-axis worktable 34, the X-axis worktable 33, and the disk 31 to reciprocate along the Y-axis guide rails 45. The two X-axis guide rails 43 are located on the upper surface of the Y-axis worktable 34. The lower end of the X-axis worktable 33 is slidably connected to the two X-axis guide rails 43, and the upper surface of the X-axis worktable 33 is connected to the disk 31. The X-axis drive motor 42 is fixedly connected to the X-axis worktable 33 and is used to drive the X-axis worktable 33 and the disk 31 to slide along the X-axis guide rails 43. This can increase the range of motion of disk 31 and improve compatibility.

[0052] The disc drive unit 41 includes a disc drive motor 411, a drive pulley 412, a belt, multiple driven pulleys 413, a positioning wheel 414, an adjusting plate 415, and two adjusting wheels 416. The output shaft of the disc drive motor 411 is connected to the drive pulley 412, and the multiple driven pulleys 413 are spaced apart around the periphery of the disc 31. One end of the belt is connected to the drive pulley 412, and multiple driven pulleys 413 are spaced apart on the inner side of the belt. The control system can control the rotation angle of the disc 31 by controlling the rotation angle of the disc drive motor 411, allowing the disc 31 to rotate at any angle. The outer periphery of the drive pulley 412 is provided with a first straight tooth, and the inner side of the belt is provided with a second straight tooth, which meshes with the second straight tooth. The driven pulleys 413 are provided with a third straight tooth, which meshes with the second straight tooth. This improves transmission efficiency and facilitates control of the rotation angle of the disc 31.

[0053] Please refer to Figure 6 , Figure 7A positioning wheel 414 is also provided at the lower end of the driven wheel 413. The side of the positioning wheel 414 is located in the groove 321, and the end of the upper surface of the positioning wheel 414 is pressed and connected to the upper side wall of the groove 321. This can improve the stability of the positioning wheel 414 and the annular guide rail 32, thereby ensuring the accuracy of the rotation of the disc 31.

[0054] The positioning wheel 414 is hollow inside, and a first limiting groove 4141 is provided on its inner side wall. At least one set of the first limiting groove 4141 is provided. The positioning wheel 414 also has multiple steel balls 4142 and studs 4143. One end of each steel ball 4142 is located within the first limiting groove 4141. One end of the stud 4143 has a second limiting groove 4144 corresponding to the first limiting groove 4141, and the other end of each steel ball 4142 is located within the second limiting groove 4144, used to fix the stud 4143 to the positioning wheel 414. The other end of the stud 4143 passes sequentially through the positioning wheel 414, the driven wheel 413, and connects to the disc 31. Installation and disassembly are convenient, facilitating maintenance.

[0055] Please refer to Figure 4 An adjusting plate 415 is fixedly mounted on the frame 20. The adjusting plate 415 has two adjusting slots arranged side-by-side. One adjusting wheel 416 corresponds to one adjusting slot, and the adjusting wheel 416 is bolted to the adjusting plate 415, used to adjust the distance between the two adjusting wheels 416. The adjusting wheel 416 is positioned between the driving wheel 412 and the driven wheel 413. The outer side of the belt is pressed against the adjusting wheel 416, and the belt passes through the gap between the two adjusting wheels 416. Adjusting the distance between the two adjusting wheels 416 adjusts the belt tension, improving the rotational accuracy of the disc 31.

[0056] In this embodiment, please refer to Figure 3 , Figure 8 Two sets of jumper devices 50 are respectively located at both ends of one side of the head insertion device 60, and are symmetrically arranged with respect to the center of the head insertion device 60. This provides a larger working area, prevents mutual interference, and improves work efficiency. Please refer to... Figure 2 The jumper cable device 50 includes a fixing unit, a traction unit, and a straightening unit. The fixing unit is fixedly connected to the head insertion device 60. The traction unit is located on the side of the fixing unit closer to the head insertion device 60 and is used to move the jumper cable. The straightening unit is located at the end of the traction unit away from the head insertion device 60 and is used to center and level the jumper cable. This improves the jumper cable conveying efficiency and the shaping quality of the jumper cable, thereby improving work efficiency.

[0057] The fixing unit includes a fixing block 511, a connecting block 512, a bearing seat 513, a jumper box aluminum block 514, a first aluminum block 515, and a second aluminum block 516. The fixing block 511 is bolted to the head tool holder of the head insertion device 60. One end of the connecting block 512 is connected to the fixing block 511, and the other end is connected to the bearing seat 513. One end of the bearing seat 513 is connected to the jumper box aluminum block 514. The second aluminum block 516 has a second through slot and is located at the end of the first gap away from the straightening unit, used to guide the jumper wire to the head insertion device 60, improving work efficiency. The second aluminum block 516 is fixed above one end of the jumper box aluminum block 514, and a second jumper gear 524 is fixed above the other end of the jumper box aluminum block 514. The first aluminum block 515 is provided with a first through slot. The first aluminum block 515 is located at the end of the straightening unit away from the servo motor 521, and the first aluminum block 515 is fixed to the end of the roller seat 533. The jumper wire passes through the first through slot to guide the jumper wire into the straightening unit.

[0058] The traction unit includes a servo motor 521, a straight jumper wire connecting block 522, a first jumper wire gear 523, and a second jumper wire gear 524. The servo motor 521 is mounted on a bearing housing 513. The first jumper wire gear 523 is fitted onto the outer circumference of the output shaft of the servo motor 521. The second jumper wire gear 524 is located on one side of the first jumper wire gear 523, and the first jumper wire gear 523 and the second jumper wire gear 524 are meshed together. A first gap is provided between the upper end of the first jumper wire gear 523 and the upper end of the second jumper wire gear 524. The jumper wire is located within the first gap and is in close contact with the upper ends of both the first jumper wire gear 523 and the second jumper wire gear 524. The servo motor 521 drives the first jumper wire gear 523 to rotate, and the first jumper wire gear 523 drives the second jumper wire gear 524 to rotate. Because the jumper wire is pressed and connected to the upper ends of the first jumper wire gear 523 and the second jumper wire gear 524, the jumper wire can be pulled forward during rotation. The straightened jumper wire connecting block 522 is installed on the roller fixing block 531 and the bearing seat 513, and is used to guide the straightened jumper wire into the traction unit.

[0059] The straightening unit includes a horizontal straightening component and a vertical straightening component. The horizontal straightening component includes a roller fixing block 531 and multiple first small wheels 532. One end of the roller fixing block 531 is connected to the bearing seat 513. The roller fixing block 531 is horizontally positioned, and multiple first small wheels 532 are arranged on its upper surface. The multiple first small wheels 532 are arranged in two groups, and a second gap is provided between the outer circumferences of the two groups of first small wheels 532. The second gap and the first gap are located on the same horizontal line to facilitate the passage of the jumper wire. The jumper wire is squeezed through the second gap to straighten and center the jumper wire from left to right, improve the forming quality of the jumper wire, and save costs.

[0060] The first small wheel 532 can be set to 7 units, with 4 units in one group and 3 units in another. The first small wheels 532 in one group are staggered with those in the other group to extend the shaping path and save costs. The first small wheels 532 in each group can also be set at intervals to save costs. When the jumper cable passes through, it is squeezed by the first small wheels 532 on both sides, which straightens the horizontally bent part of the jumper cable, achieving the effect of horizontal shaping and centering.

[0061] The vertical straightening assembly includes a roller base 533 and multiple second pinions 534. The roller base 533 is located at the end of the roller fixing block 531 furthest from the servo motor 521. A mounting surface is provided on the side of the roller base 533, perpendicular to the upper surface of the roller fixing block 531. Multiple second pinions 534 are mounted on the mounting surface, arranged in two groups. A third gap is provided between the two groups of second pinions 534, and this third gap is on the same horizontal line as the second gap, facilitating the passage of jumper wires. The jumper wire is pressed through the third gap to vertically straighten and center it, improving the forming quality of the jumper wire and saving costs.

[0062] There are seven second small wheels 534, four at the lower end of the mounting surface and three at the upper end. The upper and lower second small wheels 534 are staggered to extend the shaping path and save costs. The second small wheels 534 in each group are spaced apart to further reduce costs. When the jumper wire passes through the third gap, it is squeezed by the second small wheels 534 on both sides, straightening the vertically bent part of the jumper wire and achieving a vertical shaping and centering effect.

[0063] In use, select one set of jumper devices 50 according to the jumper specifications. Manually pass the end of the jumper through the first through slot, the third gap, the second gap, and then through the first gap and the second through slot in sequence. Start the servo motor 521, and the jumper moves towards the head insertion device 60 under the traction of the first jumper gear 523 and the second jumper gear 524. The subsequent part of the jumper passes through the vertical straightening component and the horizontal straightening component for vertical and horizontal straightening and centering, improving the utilization rate of the jumper and the efficiency of the work. Adding this jumper device 50 will not affect the use of the jumper device 50 on the other side, nor will it interfere with the head insertion device 60. On the contrary, it increases the functionality of the insertion machine and improves its cost-effectiveness. It allows the machine to adapt to jumpers of different diameters, increasing the machine's functionality and improving its cost-effectiveness. The jumper device 50 increases compatibility with jumpers of different diameters, has stable performance, is easy to install and debug, and significantly improves production efficiency.

[0064] Please refer to Figure 9The head insertion device 60 includes a head support 6111, a blade drive unit 62, and a blade unit 63. The head support 6111 is mounted on the crossbeam 21, the blade drive unit 62 is mounted on the head support 6111, and the blade unit 63 is connected to the blade drive unit 62. The blade drive unit 62 is used to drive the blade unit 63 to move up and down to perform cutting, shaping, and insertion operations on the components.

[0065] In this embodiment, please refer to Figure 10 , Figure 11 , Figure 12 The tool assembly drive unit 62 includes a tool assembly drive component 621, a tool holder 622, a tool box 623, a first ball box 624, a first ball, a second ball box 625, and a second ball. The tool assembly drive component 621 is mounted on the head support 6111, and the tool holder 622 is slidably connected to the head support 6111. The tool assembly drive component 621 is used to drive the tool holder 622 to reciprocate up and down.

[0066] Please refer to Figure 11 The tool set drive assembly 621 includes a motor 6211, a synchronous pulley 6212, a driven pulley 6213, a belt 6214, a transmission gear shaft 6215, a Z-axis rack 6216, a rotating rod 6217, and a connector 6218. The motor 6211 is mounted on one side of the head support 6111, and its output shaft is connected to the synchronous pulley 6212. One end of the transmission gear shaft 6215 is fitted with the driven pulley 6213, and the belt 6214 is mounted on both the synchronous pulley 6212 and the driven pulley 6213. The transmission gear shaft 6215 is rotatably mounted on the head support 6111, and a first gear is mounted on it. A guide rail 611 is mounted on the side of the head support 6111. One side of the Z-axis rack 6216 is slidably connected to the guide rail 611, and a second gear is mounted on the other side of the Z-axis rack 6216, meshing with the first gear. The lower end of the Z-axis rack 6216 is connected to the tool holder 622, making efficient use of space and saving costs. The motor 6211 is used to drive the Z-axis rack 6216 up and down through the transmission gear shaft 6215, thereby driving the tool holder 622 and the tool assembly unit 63 on the tool holder 622 to move up and down for operation.

[0067] The lower end of the Z-axis rack 6216 is equipped with a rotating rod 6217, and one end of the connector 6218 is fitted onto the rotating rod 6217. The upper end of the tool post 622 is equipped with a slot 6226, and the other end of the connector 6218 is engaged within the slot 6226. Installation and disassembly are convenient, facilitating maintenance and transportation. Please refer to [reference needed]. Figure 13The connector 6218 includes a first connecting segment, a second connecting segment, and a third connecting segment. The first connecting segment is a cylindrical rod, and one end of the first connecting segment is connected to a rotating rod 6217. The other end of the first connecting segment is connected to one end of the second connecting segment, and the diameter of the second connecting segment is smaller than that of the first connecting segment. The other end of the second connecting segment is connected to one end of the third connecting segment, and the third connecting segment is a spherical structure with a diameter smaller than that of the first connecting segment. A slot 6226 is matched with the third connecting segment to improve the secure fastening and installation / removal efficiency. A connector cover 626 is provided on the upper end of the frame 6221 of the tool holder 622. The connector cover 626 is screwed to the upper end of the frame 6221. A slot 6226 is provided between the connector cover 626 and the tool holder 622 to hold the third connecting segment in the slot 6226, thereby improving installation / removal efficiency.

[0068] Please refer to Figure 12 The blade holder 623 includes a cover 6231, a frame 6232, and an adjusting bracket 6233. One side of the frame 6232 is fixedly connected to the head bracket 6111 and is located below the slide rail. One end of the adjusting bracket 6233 is connected to the frame 6232, and the other end is bolted to the cover 6231 for adjusting the position of the cover 6231. A second ball bearing box 625 is mounted on the cover 6231. The height of the second ball bearing box 625 is adjusted by adjusting the height of the cover 6231, thereby adjusting the descent height of the pusher blade 633 and improving compatibility. The frame 6232 has openings at the top and bottom, through which both the blade holder 622 and the blade assembly unit 63 pass.

[0069] Please refer to Figure 14 The tool holder 622 is designed with a cross-shaped structure, comprising a frame 6221 and a fixing plate 6222. The frame 6221 is vertically oriented, with its upper end connected to a connector 6218. The frame 6221 is a cuboid structure, with its two sides in the width direction contacting a first support frame 634 and a second support frame 635, respectively. The frame 6221 also has at least one weight-reducing hole 6223 for weight reduction, improving motion efficiency and saving costs. The fixing plate 6222 is horizontally positioned on the frame 6221, with a first groove 6224 and a second groove 6225 located on opposite sides of the frame 6221, below the fixing plate 6222. The structure is compact and saves space.

[0070] Please refer to Figure 15A first ball bearing box 624 is disposed on one side of a box frame 6232, and a first ball bearing groove is provided inside the first ball bearing box 624. A first support frame 634 is located between the first ball bearing box 624 and the cutter holder 622. A first groove 6224 is provided on the side of the cutter holder 622 opposite to the first ball bearing box 624. Initially, the first ball bearing is located between the first groove 6224 and the first through hole 6341. The first support frame 634 is provided with a first through hole 6341, which connects the first ball bearing groove and the first groove 6224. When the cutter 631 cuts the component foot, the first ball bearing rolls from the first groove 6224 into the first ball bearing groove, so that the first ball bearing is located between the first through hole 6341 and the first ball bearing groove, which can fix the first support frame 634, so that the cutter 631 no longer descends with the cutter holder 622. It is flexible in use, simple in structure, and easy to install and disassemble.

[0071] The first ball bearing box 624 is located on one side of the cover 6231, and the second ball bearing box 625 has a second ball bearing groove. The second support frame 635 is located between the second ball bearing box 625 and the tool holder 622. The tool holder 622 has a second groove 6225 on the side opposite to the second ball bearing box 625, and the second ball bearing is located between the second groove 6225 and the second through hole 6351. The second support frame 635 has a second through hole 6351, which connects the second ball bearing groove and the second groove 6225. When the forming tool 632 forms the element foot, the second ball bearing rolls from the second groove 6225 into the second ball bearing groove, so that the second ball bearing is located between the second through hole 6351 and the second ball bearing groove, which can fix the second support frame 635 and stop the forming tool 632 from descending. It is flexible in use, simple in structure, and easy to install and disassemble. Springs are installed in both the first ball bearing box 624 and the second ball bearing box 625, with the first and second balls engaged between the springs and the tool holder 622. When the tool holder 622 moves upward, under the force of the springs, the first ball returns from the first ball bearing groove to the first groove 6224, and the second ball returns from the second ball bearing groove to the second groove 6225, thereby causing the first support frame 634 and the second support frame 635 to return to their initial state.

[0072] In this embodiment, please refer to Figure 16 , Figure 17 , Figure 18The blade assembly unit 63 includes two cutting blades 631, two forming blades 632, two push blades 633, a first support frame 634, a second support frame 635, two forming blades 636, and two downward-curving blades 637. The first support frame 634 and the second support frame 635 are respectively disposed on both sides of the blade holder 622. The two cutting blades 631 are connected to the first support frame 634 and are located on both sides of the first support frame 634. The two forming blades 632 are disposed on the second support frame 635, and the two push blades 633 are disposed on the blade holder 622, located between the two forming blades 632. The two forming blades 632 are located between the two cutting blades 631. The two cutting blades 631, two forming blades 632, and two push blades 633 are all vertically arranged on the same plane, and the blades on both sides are symmetrically arranged with respect to the blade holder 622. Please refer to... Figure 19 The forming blade 632 has a clearance groove 6321 on its side end. Two forming blades 636 are respectively set on two opposite sides of the two forming blades 632, and are located below the pusher blade 633. One end of the lower curved blade 637 is connected to one end of the forming blade 636, and the other end of the lower curved blade 637 is suspended. Before the forming blade 632 completes the forming operation, the two forming blades 636 are set horizontally, and the lower curved blade 637 is suspended. After the forming blade 632 completes the forming operation, the forming blade 636 swings back, driving the lower curved blade 637 to swing back, so that the other end of the lower curved blade 637 is located in the clearance groove 6321 of the forming blade 632, so that the forming blade 636 provides clearance for the pusher blade 633, which facilitates the downward movement of the pusher blade 633. The lower ends of the cutting blade 631, forming blade 632, and pusher blade 633 are all provided with a V-shaped groove 638, which can hold the component during operation, improving operation efficiency and operation accuracy.

[0073] In the initial state until the cutter 631 cuts off the component lead, the cutter 631, forming cutter 632, and pusher 633 are relatively stationary, with the lower end of the cutter 631 at the bottom and the lower end of the pusher 633 at the top. When the cutter 631 cuts off the component lead, the cutter 631 is fixed to the first support frame 634, and the cutter holder 622 moves the forming cutter 632 and pusher 633 downwards. When the forming cutter 632 has finished forming the component lead, the forming cutter 632 remains stationary, and the cutter holder 622 moves the pusher 633 downwards. When the pusher 633 presses the formed component lead into the circuit board, the pusher 633 is at its lowest point.

[0074] The principle of this head plug-in device 60 will be described in detail below.

[0075] 1. The motor 6211 drives the Z-axis rack 6216 to move downward along the guide rail 611 through the transmission gear shaft 6215, thereby driving the tool holder 622, the first support frame 634, the second support frame 635, the cutter 631, the forming blade 632, the pusher 633, the first ball bearing, and the second ball bearing to move downward together.

[0076] Second, when the cutter 631 touches the component and cuts off the component's lead, the first ball bearing is exactly in position in the first ball bearing groove. As the cutter holder 622 continues to move downward, the first ball bearing rolls from the first groove 6224 into the first ball bearing groove. The first support frame 634 is fixedly connected to the box frame 6232, causing the first support frame 634, the cutter 631, and the cutter holder 622 to separate and stop moving. At the same time, under the pressure of the cutter holder 622, the spring inside the first ball bearing box 624 is compressed.

[0077] Third, the blade holder 622 continues to move downwards. When the forming blade 632 touches the cut component foot, the component foot bends 90° under the action of the forming blade 632, completing the forming operation. At this time, the second ball is located in the second ball groove. As the blade holder 622 continues to move downwards, the second ball rolls from the second groove 6225 into the second ball groove. The second support frame 635 is fixedly connected to the cover 6231, causing the second support frame 635, the forming blade 632, and the blade holder 622 to separate and stop moving. At the same time, under the pressure of the blade holder 622, the spring in the second ball box 625 is compressed. The forming blade 636 drives the lower curved blade 637 to rotate backwards, offsetting its position from the push blade 633.

[0078] Fourth, the tool holder 622 continues to move downward, and the pusher 633, under the pushing force of the tool holder 622, inserts the formed component lead into the corresponding span hole on the circuit board, completing the insertion operation.

[0079] 5. Motor 6211 reverses, driving tool holder 622 upward. When it reaches the position of the second ball bearing hole in the second groove 6225, the second ball bearing returns to the second groove 6225 under the push of the spring, thus fixing the second support frame 635 to the tool holder 622. Continuing upward, when it reaches the position of the first ball bearing hole in the first groove 6224, the first ball bearing returns to the first groove 6224 under the push of the spring, thus fixing the first support frame 634 to the tool holder 622. Tool holder 622 continues to move upward until it returns to its initial position, starting the next insertion operation.

[0080] The working principle of this embodiment will be described in detail below.

[0081] 1. Start the control system. The left connecting unit 71 transports the circuit board to the plug-in transport unit 35, and the plug-in transport unit 35 transports the circuit board to the set position.

[0082] 2. The Y-axis drive motor 44 drives the Y-axis worktable 34 and the X-axis drive motor 42 drives the X-axis worktable 33 to move to the set position. The disc drive motor 411 starts and controls the disc 31 drive device 40 to rotate a certain angle through the control system. The belt drives the driven wheel 413 and the disc 31 to rotate the same angle.

[0083] Third, the double jumper device delivers the jumper to the lower end of the head insertion device 60, the cutter cuts the jumper, the forming blade shapes the jumper, and the pusher inserts the shaped jumper into the corresponding position on the circuit board.

[0084] IV. The base cutting device 90 cuts off the excess jumper wires at the bottom of the circuit board.

[0085] 5. Rotate disc 31 to the set angle and repeat steps 2 to 4 until all the circuit board insertion work is completed.

[0086] 6. The plug-in conveying unit 35 conveys the circuit board to the right connecting unit 72, and the right connecting unit 72 conveys the plugged circuit board to the next process.

[0087] In this embodiment, the present invention relates to a horizontal insertion machine, which includes a frame, a worktable assembly, a drive unit, a conveying unit, a jumper wire assembly, and a head insertion assembly. The worktable assembly is mounted on the frame and includes a disc movably mounted on the frame. An insertion conveying unit is mounted on the disc for conveying circuit boards. The conveying unit transports the circuit boards onto the worktable assembly. The jumper wire assembly is mounted on the worktable assembly for conveying jumper wires. The head insertion assembly is mounted on the frame and located to one side of the jumper wire assembly, for cutting and pressing the jumper wires conveyed by the jumper wire assembly onto the circuit board. A base clipping device is located below the head assembly for clipping the leads of components inserted into the circuit board. The drive unit includes a disc drive unit for driving the worktable assembly to rotate at any angle. The disc drive unit includes a disc drive motor, a drive wheel, a belt, and multiple driven wheels. The output shaft of the disc drive motor is connected to the drive wheel, and the multiple driven wheels are spaced apart around the periphery of the disc and pressed against it. One end of the belt is connected to the drive pulley, and multiple driven pulleys are spaced apart on the inner side of the belt. The rotation angle of the disc is controlled by controlling the rotation angle of the disc drive motor, allowing the disc to rotate at any angle, which greatly improves compatibility and insertion efficiency. This solves the problem of poor insertion orientation compatibility and low efficiency caused by the fact that the worktable of the insertion machine can only rotate 90° at a time in the existing technology.

[0088] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. A workbench device, characterized in that, The workbench device includes a disc and a drive device. The disc is movably mounted on the frame and is equipped with a plug-in conveying unit for conveying circuit boards. The drive device includes a disc drive unit for driving the disc to rotate at any angle. The disc drive unit includes a disc drive motor, a drive pulley, a belt, multiple driven pulleys, an adjusting plate, and two adjusting pulleys. The output shaft of the disc drive motor is connected to the drive pulley. The multiple driven pulleys are spaced apart around the periphery of the disc and are press-fitted to the disc. One end of the belt is connected to the drive pulley, and multiple driven pulleys are spaced apart on the inner side of the belt. The rotation angle of the disc is controlled by controlling the rotation angle of the disc drive motor. The adjusting plate is fixedly mounted on the frame and has two adjusting slots arranged side by side. One adjusting pulley corresponds to one adjusting slot, and the adjusting pulley is bolted to the adjusting plate to adjust the distance between the two adjusting pulleys. The outer side of the belt is press-fitted to the adjusting pulleys, and the belt is located between the two adjusting pulleys. The tension of the belt is adjusted by adjusting the distance between the two adjusting pulleys. The worktable device also includes an X-axis worktable, a Y-axis worktable, and an annular guide rail. The annular guide rail is disposed below the disc and is fixedly disposed on the X-axis worktable. An annular groove is provided on the outer circumference of the annular guide rail. A positioning wheel is also provided at the lower end of the driven wheel. The side of the positioning wheel is located in the groove, and the end of the upper end face of the positioning wheel is pressed and connected to the upper side wall of the groove. The positioning wheel is hollow inside, and a first limiting groove is provided on the inner side wall of the positioning wheel. At least one set of the first limiting groove is provided. The positioning wheel is also provided with a plurality of steel balls and studs. One end of the plurality of steel balls is located in the first limiting groove. One end of the stud is provided with a second limiting groove corresponding to the first limiting groove. The other end of the plurality of steel balls is located in the second limiting groove, which is used to fix the stud to the positioning wheel. The other end of the stud passes through the positioning wheel and the driven wheel in sequence and is connected to the disc.

2. The workbench device according to claim 1, characterized in that, The plug-in conveying unit is provided with a left connecting unit and a right connecting unit at both ends. The circuit board is conveyed from the left connecting unit to the plug-in conveying unit. The plug-in conveying unit conveys the circuit board to the set position for plug-in operation. After the plug-in operation is completed, the plug-in conveying unit conveys the circuit board to the right connecting unit.

3. The workbench device according to claim 1, characterized in that, The driving device further includes an X-axis drive motor, two X-axis guide rails, a Y-axis drive motor, and two Y-axis guide rails. The two Y-axis guide rails are disposed at both ends of the frame, and the lower end of the Y-axis worktable is slidably connected to the two Y-axis guide rails. The Y-axis drive motor is fixedly connected to the Y-axis worktable and is used to drive the Y-axis worktable to reciprocate along the Y-axis guide rails. The two X-axis guide rails are disposed on the upper surface of the Y-axis worktable, and the lower end of the X-axis worktable is slidably connected to the two X-axis guide rails. The upper surface of the X-axis worktable is connected to the disk. The X-axis drive motor is fixedly connected to the X-axis worktable and is used to drive the X-axis worktable and the disk to slide along the X-axis guide rails.

4. The workbench device according to claim 1, characterized in that, Both the X-axis worktable and the Y-axis worktable have through holes in their middle sections to provide working space. A protective shell is provided on the outer periphery of the annular guide rail. The upper end of the protective shell is pressed against the upper surface end of the disk, and the lower end of the protective shell is screwed to the X-axis worktable.

5. The workbench device according to claim 1, characterized in that, The outer circumference of the driving pulley is provided with a first straight tooth, and the inner side of the belt is provided with a second straight tooth, the first straight tooth and the second straight tooth being meshed together; the driven pulley is provided with a third straight tooth, the third straight tooth being meshed together with the second straight tooth.

6. A horizontal insertion machine, characterized in that, The workbench device according to any one of claims 1-5 further includes a jumper device disposed on the workbench device and a head plug-in device mounted on the frame, wherein the two sets of jumper devices are respectively disposed on both sides of the head plug-in device.

7. The horizontal insertion machine according to claim 6, characterized in that, The jumper device includes a fixing unit, a traction unit, and a straightening unit. The fixing unit is fixedly connected to the head plug device. The traction unit is located on the side of the fixing unit close to the head plug device and is used to drive the jumper to move. The straightening unit is located at the end of the traction unit away from the head plug device and is used to center and level the jumper. The fixing unit includes a fixing block, a connecting block, a bearing seat, a jumper box aluminum block, a first aluminum block, and a second aluminum block; the traction unit includes a servo motor, a straightening jumper connecting block, a first jumper gear, and a second jumper gear; the straightening unit includes a horizontal straightening component and a vertical straightening component; the horizontal straightening component includes a roller fixing block and multiple first small wheels; the vertical straightening component includes a roller seat and multiple second small wheels. The fixing block is fixed to the head tool holder of the head insertion device by bolts. One end of the connecting block is connected to the fixing block, and the other end of the connecting block is connected to the bearing seat. One end of the bearing seat is connected to the jumper box aluminum block. The second aluminum block is provided with a second through groove. The second aluminum block is located at the end of the first gap away from the straightening unit, and is used to guide the jumper to the head insertion device. The second aluminum block is fixed above one end of the jumper box aluminum block. The second jumper gear is fixed above the other end of the jumper box aluminum block. The first aluminum block is provided with a first through groove. The first aluminum block is located at the end of the straightening unit away from the servo motor, and the first aluminum block is fixed at the end of the roller seat. The jumper passes through the first through groove and is used to guide the jumper into the straightening unit. The servo motor is mounted on the bearing housing. The first jumper gear is fitted on the outer circumference of the output shaft of the servo motor. The second jumper gear is located on one side of the first jumper gear, and the first jumper gear and the second jumper gear are meshed together. A first gap is provided between the upper end of the first jumper gear and the upper end of the second jumper gear. The jumper wire is located in the first gap and is in close contact with the upper ends of the first jumper gear and the second jumper gear. The servo motor drives the first jumper gear to rotate, and the first jumper gear drives the second jumper gear to rotate. The straightened jumper wire connecting block is mounted on the roller fixing block and the bearing housing, and is used to guide the straightened jumper wire into the traction unit. One end of the roller fixing block is connected to the bearing seat. The roller fixing block is horizontally arranged. The upper surface of the roller fixing block is provided with a plurality of first small wheels. The plurality of first small wheels are arranged in two groups. A second gap is provided between the outer circumferences of the two groups of first small wheels. The second gap and the first gap are located on the same horizontal line. The roller seat is located at the end of the roller fixing block away from the servo motor. The side of the roller seat is provided with a mounting surface, which is perpendicular to the upper surface of the roller fixing block. A plurality of second small wheels are provided on the mounting surface, and the plurality of second small wheels are arranged in two groups. A third gap is provided between the two groups of second small wheels, and the third gap and the second gap are located on the same horizontal line.

8. The horizontal insertion machine according to claim 7, characterized in that, The first small wheel is set to 7, with 4 in one group and 3 in another group. The first small wheels in one group are staggered with the first small wheels in the other group to extend the shaping path. There are 7 second small wheels, 4 of which are provided at the lower end of the mounting surface and 3 of which are provided at the upper end of the mounting surface. The second small wheels at the upper end are staggered with the second small wheels at the lower end to extend the shaping path.

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