Double-bead feeding mechanism capable of changing colors from front to back

Abstract

The utility model discloses a double-bead feeding mechanism capable of changing colors front and back, which comprises a base, a pulley is arranged on the base, a bead feeding clamp is arranged on the pulley, a jaw capable of being opened or closed under the action of the pulley is arranged at the front end of the bead feeding clamp, the double-bead feeding mechanism further comprises a shifting mechanism, a fixed positioning block is arranged above the bead feeding clamp, and the fixed positioning block is arranged on the base. A fixed positioning block is arranged on the base, a sliding positioning block is connected to the front side of the fixed positioning block in a sliding mode, a first positioning hole is formed in the sliding positioning block, a second positioning hole is formed in the fixed positioning block, a color changing supporting plate is arranged between the sliding positioning block and the base, and a front stroke limiting structure, a first rear stroke limiting structure and a second rear stroke limiting structure are arranged on the base. The sliding positioning block and the first rear stroke limiting structure can slide left and right at the same time under the action of the shifting mechanism. The bead feeding mechanism is compact in structure, small in occupied installation space, good in operation stability and reliability and suitable for the bead embroidery machine head with a plurality of bead feeding mechanisms.

Description

Technical Field

[0001] The utility model relates to a bead feeding mechanism, in particular to a double-bead feeding mechanism with front and rear color changes. Background Art

[0002] The feeding mechanism is an important structure in the bead embroidery machine, which is used to clamp and feed the embroidery beads to the embroidery needle position for bead embroidery. In order to enrich the color and layering of the pattern, there are now multi-color embroidery machines that can switch and clamp different colors of embroidery beads without stopping the machine.

[0003] For example, a Chinese patent with application publication number CN109518374A and application publication date March 26, 2019 discloses a multi-color color-changing embroidery machine head, comprising a color changing unit, a bead feeding unit, a bead blocking unit and a driving unit, wherein the color changing unit is used to selectively send the embroidery beads to the designated position of the bead feeding unit; the bead feeding unit is used to push the embroidery beads to be embroidered to the embroidery area; the bead blocking unit is arranged between the color changing unit and the bead feeding unit; the driving unit drives the color changing unit to reciprocate so that the corresponding embroidery beads pass through the bead blocking unit and fall into the designated position of the bead feeding unit. The multi-color color-changing embroidery machine head has the following defects: (1) When receiving and feeding beads, the bead feeding unit will produce position displacement due to the action of inertia, and when changing colors, the color changing unit will also produce position displacement due to the action of inertia, which may easily cause the embroidery beads to fail to fall into the specified position of the bead feeding unit, affecting the bead receiving and feeding, and poor operating stability and reliability; (2) The overall structure is not compact and occupies a large installation space; (3) The embroidery beads of different colors are arranged horizontally in the color-changing unit, and the color is changed by overall translation, which is easily limited by the horizontal space, resulting in its limited application in the embroidery machine head with multiple bead feeding mechanisms. Utility Model Content

[0004] The utility model aims to solve the above-mentioned problems existing in the multi-color changing embroidery machine head of the prior art, and provides a double bead feeding mechanism for front and rear color changing in an embroidery machine head with multiple bead feeding mechanisms, which has a compact structure, occupies a small installation space, has good operating stability and reliability, and is suitable for use.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a double-bead feeding mechanism for front and back color change, comprising a base and a toggle mechanism, a pulley is provided on the base, a bead feeding clamp is provided on the pulley, a jaw that can be opened or closed under the action of the pulley is provided at the front end of the bead feeding clamp, a fixed positioning block is provided above the bead feeding clamp, a sliding positioning block is slidably connected to the front side of the fixed positioning block, a first positioning hole is provided on the sliding positioning block, a second positioning hole is provided on the fixed positioning block, a color changing support plate is provided between the sliding positioning block and the base, a front stroke limiting structure, a first rear stroke limiting structure and a second rear stroke limiting structure are provided on the base, the sliding positioning block and the first rear stroke limiting structure can slide left and right at the same time under the action of the toggle mechanism; when the sliding positioning block and the first rear stroke limiting structure move left and right at the same time When the cam is in the position where the embroidery needle is in the embroidery state, the bead feeding clamp can slide to the front stroke limit structure and be blocked by the front stroke limit structure, and the jaws reach the embroidery needle position and remain closed. When the cam is in the position where the embroidery needle is in the embroidery state, the embroidery needle can slide to the front stroke limit structure and be blocked by the front stroke limit structure, and the jaws reach the bottom of the first positioning hole and remain open. When the sliding positioning block and the first rear stroke limit structure slide to the right to the end of the stroke, the first positioning hole and the second positioning hole are staggered front and back, and the first positioning hole is located above the color changing support plate and is blocked. When the cam is in the position where the embroidery needle is in the embroidery state, the embroidery needle can slide to the front stroke limit structure and be blocked by the front stroke limit structure, and the jaws reach the bottom of the embroidery needle position and remain closed. When the cam is in the position where the embroidery needle is in the embroidery state, the embroidery needle can slide to the front stroke limit structure and be blocked by the front stroke limit structure, and the jaws reach the bottom of the second positioning hole and remain open.The embroidery beads are then moved back and forth to the embroidery needle position, and the embroidery beads are ... When the bead feeding clamp moves, the front stroke limiting structure limits the front stroke of the bead feeding clamp, and the first rear stroke limiting structure limits the rear stroke of the bead feeding clamp, and the jaws can accurately move backward to the bottom of the first positioning hole and remain stably open, so as to catch the embroidery beads dropped from the first positioning hole, and the bead receiving is more reliable; when changing colors, the sliding positioning block and the first rear stroke limiting structure slide to the right to the end of the stroke at the same time, at this time, the first positioning hole and the second positioning hole are staggered front and back, and when the bead feeding clamp moves, the front stroke limiting structure limits the front stroke of the bead feeding clamp, and the second rear stroke limiting structure limits the rear stroke of the bead feeding clamp (the first rear stroke limiting structure avoids the bead feeding clamp), and the jaws can move backward to the bottom of the second positioning hole and remain stably open, so as to catch the embroidery beads dropped from the second positioning hole (to achieve color change); the sliding fixed block is moved horizontally left and right to achieve front and back color change, and the structure is compact and not easily restricted by horizontal space, so that the utility model can be applied to the head of an embroidery machine with multiple bead feeding mechanisms.

[0006] Preferably, the rear ends of both sides of the bead feeding clamp are provided with limit blocks, a slide groove is provided in the base, the pulley is arranged in the slide groove, and the inner walls of both sides of the slide groove are provided with travel limit grooves, the limit blocks are located in the travel limit grooves, the front inner wall of the travel limit groove forms a front travel limit structure, and the rear inner wall of the travel limit groove forms a second rear travel limit structure. The cooperation of the limit blocks and the travel limit grooves limits the front and rear travels of the bead feeding clamp, and the structure is simple.

[0007] Preferably, the first rear stroke limit structure includes a sliding slot, a limit pull block and a stop block, the limit pull block is arranged in the sliding slot and connected to the toggle mechanism, the stop block is fixed on the limit pull block, an avoidance gap is provided between the pulley and the base for the limit pull block to pass through, and an avoidance groove is provided at the bottom of the bead feeding clamp to accommodate the limit pull block. When the stopper moves to the left to the end point, the bead feeding clamp is blocked and limited by the stopper when it moves backward (before the second rear stroke limit structure), and the jaws are just below the first positioning hole; when the stopper moves to the right to the end point, the stopper is aligned with the air avoidance groove, and the first positioning hole is located above the color changing tray (so that the color changing tray can block the embroidery beads in the first positioning hole to catch the embroidery beads falling from the second positioning hole, avoiding the embroidery beads in the first positioning hole from interfering with the bead feeding clamp), when the bead feeding clamp retreats, the stopper enters the air avoidance groove to avoid the bead feeding clamp, and the bead feeding clamp can continue to move backward until it is blocked by the second rear stroke limit structure, and the jaws are just below the second positioning hole to catch the embroidery beads falling from the second positioning hole.

[0008] Preferably, the bottom surface of the limit pull block is provided with a limit step, and the bottom surface of the base is provided with a limit gasket that interferes with the limit step. The limit step and the limit gasket cooperate to limit the left and right translation stroke of the limit pull block, while ensuring the accuracy of the position of the sliding positioning block.

[0009] Preferably, the toggle mechanism includes a color-changing motor, a limit fork and a transmission shaft, the transmission shaft is rotatably connected to the base, a color-changing connecting rod is fixed at one end of the transmission shaft, and a color-changing swing rod is fixed at the other end, a color-changing fork is fixed at the output end of the color-changing motor, the lower end of the color-changing fork is toggle-connected with the color-changing connecting rod, a limit fork connecting rod is fixed on the color-changing connecting rod, a sliding lever is fixed on the limit fork connecting rod, the limit fork is rotatably connected to the base, a first toggle limit slot is provided on the upper part of the limit fork, the sliding lever cooperates with the first toggle limit slot, the lower part of the limit fork is toggle-connected with the limit pull block; a second toggle limit slot is provided on the color-changing swing rod, a sliding pin is provided on the sliding positioning block, and the sliding pin cooperates with the second toggle limit slot. The toggle mechanism in the utility model adopts the above structure, has a compact structure, a small volume, and an accurate toggle position, which can ensure the accuracy of the moving position of the sliding positioning block and the stopper.

[0010] Preferably, a color-changing connecting rod seat is provided on the base, the transmission shaft is rotatably arranged in the color-changing connecting rod seat, a motor seat is provided on the color-changing connecting rod seat, and the color-changing motor is fixed on the motor seat.

[0011] Preferably, a bearing seat is provided on one side of the color-changing connecting rod seat, a connecting pin is provided in the bearing seat, and the connecting pin is fixedly connected to the middle part of the limit shift fork.

[0012] Preferably, the fixed positioning block is provided with a guide protrusion, and the sliding positioning block is provided with a guide groove matched with the guide protrusion.

[0013] Preferably, the base is provided with a bead-moving motor seat, the bead-moving motor seat is provided with a fork mechanism for driving the pulley to slide forward and backward, and the inner side of the bead-moving motor seat is provided with a limit bar for limiting the longitudinal jump of the pulley. The fork mechanism is a conventional mechanism in this field, so it is not described in detail.

[0014] Preferably, a magnet is provided on the bottom surface of the bead feeding clamp, and the magnet is in magnetic attraction contact with the base to generate a friction damping force, and the jaws are opened or closed under the combined action of the pulley and the friction damping force.

[0015] Therefore, the utility model has the following beneficial effects: through the mutual cooperation between the fixed positioning block, the sliding positioning block, the toggle mechanism, the front stroke limit structure, the first rear stroke limit structure and the second rear stroke limit structure, the front and rear color change of the embroidery beads can be realized; the structure is compact, the installation space is small, the operation stability and reliability are good, and it is suitable for the embroidery machine head with multiple bead feeding mechanisms. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a stereogram of the utility model.

[0017] Figure 2 It is a connection diagram of the base, pulley, bead feeding clamp, limit pull block and limit gasket.

[0018] Figure 3 It is a three-dimensional picture of the bead feeding clamp.

[0019] Figure 4 It is a connection diagram of the fixed positioning block and the sliding positioning block.

[0020] Figure 5 It is a connection diagram of the base, the pulley, the bead feeding clamp and the first rear stroke limit structure.

[0021] Figure 6 It is a three-dimensional image of the base.

[0022] Figure 7 yes Figure 5 Exploded diagram of .

[0023] Figure 8 It is a connection diagram of the toggle mechanism and the base.

[0024] Fig. 9 It is a connection diagram of the fork mechanism and the base.

[0025] In the figure: base 1, pulley 2, bead feeding clamp 3, jaw 4, fixed positioning block 5, sliding positioning block 6, first positioning hole 7, second positioning hole 8, color changing support plate 9, limit block 10, slide groove 11, travel limit groove 12, front travel limit structure 13, second rear travel limit structure 14, sliding groove 15, limit pull block 16, stopper 17, avoidance gap 18, avoidance groove 19, limit step 20, limit gasket 21, color changing motor 22, limit fork 23, transmission shaft 24, color changing connecting rod 25, color changing rocker rod 26, color changing fork 27, limit fork connecting rod 28, sliding lever 29, first shift limit slide groove 30, second shift limit slide groove 31, sliding pin 32, color changing connecting rod seat 33, motor seat 34, bearing seat 35, connecting pin 36, guide protrusion 37, guide groove 38, bead motor seat 39, shift fork mechanism 40, limit strip 41, magnet 42. DETAILED DESCRIPTION

[0026] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0027] like Figure 1 , Figure 2 The double-bead feeding mechanism with front and rear color change shown in FIG. 1 includes a base 1 and a toggle mechanism, and a bead motor base 39 (such as Fig. 9 As shown in the figure, a fork mechanism 40 for driving the pulley to slide forward and backward is provided on the bead-moving motor seat, a limit strip 41 for limiting the longitudinal jump of the pulley is provided on the inner side of the bead-moving motor seat, a slide groove 11 is provided in the base, a pulley 2 is installed in the slide groove, the pulley can slide forward and backward under the action of the fork mechanism, a bead-feeding clamp 3 is installed on the pulley, a jaw 4 is provided at the front end of the bead-feeding clamp, and a magnet 42 is provided on the bottom surface of the bead-feeding clamp (as shown in the figure). Figure 3 As shown in the figure, the magnet and the base are magnetically attracted to each other to generate friction damping force, and the jaws are opened or closed under the combined action of the pulley and the friction damping force. A fixed positioning block 5 is provided above the bead feeding clamp, and a sliding positioning block 6 is slidably connected to the front side of the fixed positioning block. A guide protrusion 37 (as shown in the figure) is provided on the fixed positioning block. Figure 4 As shown), the sliding positioning block is provided with a guide groove 38 adapted to the guide protrusion, the sliding positioning block is provided with a first positioning hole 7, the fixed positioning block is provided with a second positioning hole 8, a color changing support plate 9 is provided between the sliding positioning block and the base, the base is provided with a front stroke limit structure, a first rear stroke limit structure and a second rear stroke limit structure, limit blocks 10 are provided at the rear ends of both sides of the bead feeding clamp, and stroke limit grooves 12 are provided on the inner walls of both sides of the slide groove, the limit blocks are located in the stroke limit groove, the front end inner wall of the stroke limit groove forms a front stroke limit structure 13, and the rear end inner wall of the stroke limit groove forms a second rear stroke limit structure 14; the sliding positioning block and the first rear stroke limit structure can slide left and right at the same time under the action of the toggle mechanism, and the first rear stroke limit structure (as shown Figure 5 , Figure 6 , Figure 7 As shown in the figure, the bead feeding clamp comprises a sliding notch 15, a limiting pull block 16 and a stopper 17. The sliding notch is arranged on the base, the limiting pull block is arranged in the sliding notch and is connected to the toggle mechanism, the stopper is fixed on the limiting pull block, an avoidance gap 18 for the limiting pull block to pass through is arranged between the pulley and the base, an avoidance groove 19 for accommodating the limiting pull block is arranged at the bottom of the bead feeding clamp, a limiting step 20 is arranged on the bottom surface of the limiting pull block, and a limiting gasket 21 interfering with the limiting step is arranged on the bottom surface of the base; the toggle mechanism comprises a color changing motor 22, a limiting fork 23 and a transmission shaft 24 (as shown in the figure, the limiting fork 23 and the transmission shaft 24 are arranged at the bottom surface of the bead feeding clamp, and the limiting step 20 is arranged on the bottom surface of the bead feeding clamp, and the limiting step 20 is arranged on the bottom surface of the bead feeding clamp, and the limiting step 21 is arranged on the bottom surface of the base; the toggle mechanism comprises a color changing motor 22, a limiting fork 23 and a transmission shaft 24 (as shown in the figure, the limiting fork 23 and the transmission shaft 24 are arranged at the bottom surface of the bead feeding clamp, and the limiting step 20 is arranged on the bottom surface of the bead feeding clamp, and the limiting step 21 is arranged on the bottom surface of the bead feeding clamp; the limiting step 20 is arranged on the bottom surface of the bead feeding clamp, and the limiting step 21 is arranged on the bottom surface of the bead feeding clamp; the toggle mechanism comprises a color changing motor 22, a limiting fork 23 and a transmission shaft 24 (as shown in the figure, the limiting fork 23 and the transmission shaft 24 are arranged at the bottom surface of the bead feeding clamp, and the limiting step 20 is arranged on the bottom surface of the Figure 8 As shown in the figure, a color-changing connecting rod seat 33 is provided on the base, and a transmission shaft is rotatably arranged in the color-changing connecting rod seat. A motor seat 34 is fixed on the color-changing connecting rod seat, and the color-changing motor is fixed on the motor seat. A color-changing connecting rod 25 is fixed on one end of the transmission shaft, and a color-changing swing rod 26 is fixed on the other end. A color-changing fork 27 is fixed on the output end of the color-changing motor, and the lower end of the color-changing fork is connected to the color-changing connecting rod for toggling. A limited fork connecting rod 28 is fixed on the color-changing connecting rod, and a sliding lever 29 is fixed on the limited fork connecting rod. A bearing seat 35 is provided on one side of the color-changing connecting rod seat, and a connecting pin 36 is provided in the bearing seat. The connecting pin is fixedly connected to the middle part of the limit fork. A first toggle limit sliding groove 30 is provided on the upper part of the limit fork, and the sliding lever cooperates with the first toggle limit sliding groove, and the lower part of the limit fork is connected to the limit pull block for toggling; a second toggle limit sliding groove 31 is provided on the color-changing swing rod, and a sliding pin 32 is provided on the sliding positioning block. The cam is in a position to move in a direction opposite to the first stop, and the cam is in a position to move in a direction opposite to the first stop, so that the cam is in a position to move in a direction opposite to the first stop, and the cam is in a position to move in a direction opposite to the first stop, so that the cam is in a position to move in a direction opposite to the first stop.

[0028] The operation process of the utility model is as follows: when the sliding positioning block is located in front of the fixed positioning block, the first positioning hole and the second positioning hole are aligned front and back, the stopper is staggered with the avoidance groove, the jaws are closed, and the bead feeding clamp slides forward under the action of the pulley and can slide to the front stroke limit structure (the front end inner wall of the stroke limit groove) and is blocked by the front stroke limit structure, the jaws reach the embroidery needle position, and after the embroidery beads in the jaws are embroidered on the fabric, the bead feeding clamp slides backward under the action of the pulley, the jaws open, the bead feeding clamp can slide to the stopper and is blocked by the stopper, and the jaws reach below the first positioning hole and remain open; when changing colors, the toggle mechanism drives the sliding positioning block to move right to the end of the stroke At this point, the first positioning hole and the second positioning hole are staggered front and back, the stopper is aligned with the air avoidance groove, the first positioning hole is located above the color changing support plate and is blocked, and the bead feeding clamp can slide forward under the action of the pulley (the front end inner wall of the stroke limit groove) and is blocked by the front stroke limit structure, and the jaws reach the embroidery needle position. After the embroidery beads in the jaws are embroidered on the fabric, the bead feeding clamp slides backward under the action of the pulley, and the jaws open. During the backward sliding process of the bead feeding clamp, the stopper enters the air avoidance groove, and the bead feeding clamp can slide to the second rear stroke limit structure (the rear end inner wall of the stroke limit groove) and is blocked by the second rear stroke limit structure, and the jaws reach below the second positioning hole and remain open.

[0029] The above-described embodiment is only a preferred solution of the present invention and does not limit the present invention in any form. There are other variations and modifications without exceeding the technical solution described in the claims.

Claims

1. A double-bead feeding mechanism with front and rear color change, characterized in that: The invention comprises a base (1) and a toggle mechanism, wherein a pulley (2) is provided on the base, a bead feeding clamp (3) is provided on the pulley, a jaw (4) which can be opened or closed under the action of the pulley is provided at the front end of the bead feeding clamp, a fixed positioning block (5) is provided above the bead feeding clamp, a sliding positioning block (6) is slidably connected to the front side of the fixed positioning block, a first positioning hole (7) is provided on the sliding positioning block, a second positioning hole (8) is provided on the fixed positioning block, a color changing support plate (9) is provided between the sliding positioning block and the base, a front stroke limiting structure, a first rear stroke limiting structure and a second rear stroke limiting structure are provided on the base, and the sliding positioning block and the first rear stroke limiting structure can slide left and right at the same time under the action of the toggle mechanism; when the sliding positioning block and the first rear stroke limiting structure slide left to the stroke limit at the same time, At the end point, the first positioning hole and the second positioning hole are aligned front to back, the bead feeding clamp can slide forward to the front stroke limit structure and is blocked by the front stroke limit structure, the jaws reach the embroidery needle position and remain closed, the bead feeding clamp can slide backward to the first rear stroke limit structure and is blocked by the first rear stroke limit structure, the jaws reach below the first positioning hole and remain open; when the sliding positioning block and the first rear stroke limit structure slide to the right to the end point of the stroke, the first positioning hole and the second positioning hole are staggered front to back, the first positioning hole is located above the color changing support plate and is blocked, the bead feeding clamp can slide forward to the front stroke limit structure and is blocked by the front stroke limit structure, the jaws reach the embroidery needle position and remain closed, the bead feeding clamp can slide backward to the second rear stroke limit structure and is blocked by the second rear stroke limit structure, the jaws reach below the second positioning hole and remain open.

2. A double-bead feeding mechanism with front and rear color change according to claim 1, characterized in that: Limit blocks (10) are provided at the rear ends of both sides of the bead feeding clamp, a slide groove (11) is provided in the base, the pulley is arranged in the slide groove, and travel limit grooves (12) are provided on the inner walls of both sides of the slide groove, the limit blocks are located in the travel limit groove, the front inner wall of the travel limit groove forms a front travel limit structure (13), and the rear inner wall of the travel limit groove forms a second rear travel limit structure (14).

3. A double-bead feeding mechanism with front and rear color change according to claim 1 or 2, characterized in that: The first rear stroke limit structure comprises a sliding slot (15), a limit pull block (16) and a stop block (17); the limit pull block is arranged in the sliding slot and connected to the toggle mechanism; the stop block is fixed on the limit pull block; an avoidance gap (18) is provided between the pulley and the base for the limit pull block to pass through; and a clearance groove (19) is provided at the bottom of the bead feeding clamp for accommodating the limit pull block.

4. A double-bead feeding mechanism with front and rear color change according to claim 3, characterized in that: The bottom surface of the limiting pull block is provided with a limiting step (20), and the bottom surface of the base is provided with a limiting gasket (21) that interferes with the limiting step.

5. A double-bead feeding mechanism with front and rear color change according to claim 3, characterized in that: The toggle mechanism comprises a color-changing motor (22), a limit fork (23) and a transmission shaft (24); the transmission shaft is rotatably connected to the base; a color-changing connecting rod (25) is fixed to one end of the transmission shaft, and a color-changing swing rod (26) is fixed to the other end; a color-changing fork (27) is fixed to the output end of the color-changing motor; the lower end of the color-changing fork is toggle-connected to the color-changing connecting rod; a limit fork connecting rod (28) is fixed to the color-changing connecting rod; a sliding lever (29) is fixed to the limit fork connecting rod; the limit fork is rotatably connected to the base; a first toggle limit slot (30) is provided on the upper part of the limit fork; the sliding lever cooperates with the first toggle limit slot; the lower part of the limit fork is toggle-connected to the limit pull block; the color-changing swing rod is provided with a second toggle limit slot (31); the sliding positioning block is provided with a sliding pin (32); the sliding pin cooperates with the second toggle limit slot.

6. A double-bead feeding mechanism with front and rear color change according to claim 5, characterized in that: A color-changing connecting rod seat (33) is provided on the base, the transmission shaft is rotatably arranged in the color-changing connecting rod seat, a motor seat (34) is provided on the color-changing connecting rod seat, and the color-changing motor is fixed on the motor seat.

7. A double-bead feeding mechanism with front and rear color change according to claim 6, characterized in that: A bearing seat (35) is provided on one side of the color-changing connecting rod seat, and a connecting pin (36) is provided in the bearing seat, wherein the connecting pin is fixedly connected to the middle part of the limit shift fork.

8. A double-bead feeding mechanism with front and rear color change according to claim 1, characterized in that: The fixed positioning block is provided with a guide protrusion (37), and the sliding positioning block is provided with a guide groove (38) matched with the guide protrusion.

9. A double-bead feeding mechanism with front and rear color change according to claim 1, characterized in that: The base is provided with a bead-moving motor seat (39), the bead-moving motor seat is provided with a shifting fork mechanism (40) for driving the pulley to slide forward and backward, and the inner side of the bead-moving motor seat is provided with a limit strip (41) for limiting the longitudinal jump of the pulley.

10. A double-bead feeding mechanism with front and rear color change according to claim 1, characterized in that: The bottom surface of the bead feeding clamp is provided with a magnet (42), and the magnet is in magnetic attraction contact with the base to generate a friction damping force, and the jaws are opened or closed under the combined action of the pulley and the friction damping force.

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