A positioning mechanism of a guide bead bar

Abstract

The utility model provides a kind of positioning mechanism of guide bead bar, including the chuck assembly of at least two positioning guide bead bar, and the driving structure of the corresponding number chuck assembly time-sharing opening and closing, the chuck assembly include a pair of mutually matched chuck, at least one the chuck assembly is located the corresponding place of two chucks respectively equipped with a first clamping groove and a second clamping groove, the first clamping groove is matched with the outer wall of guide bead bar, the positioning center when the first clamping groove clamps guide bead bar is the axle of guide bead bar;The second clamping groove is matched with the outer wall of bead on guide bead bar, the positioning center when the second clamping groove clamps bead on guide bead bar is the axle of bead, and the axle of bead and the axle of guide bead bar coincide at this time.The utility model is equipped with two clamping grooves respectively with guide bead bar and bead cooperation, prevent chuck clamps bead when position deviation, prevent bead to drive guide bead bar deviation and affect bead to fall.

Description

Technical Field

[0001] This utility model relates to the field of bead embroidery technology, and in particular to a positioning mechanism for a bead guide rod. Background Technology

[0002] Bead embroidery is an embroidery technique that uses an embroidery machine to fix connected beads onto fabric. In existing technology, the beads are transported by a feeding mechanism. The principle is that the beads are placed in a material cup and, through stirring or other methods, the beads are threaded onto a vertical guide rod, the upper end of which is connected to the material cup.

[0003] The beads on the guide rod slide down the rod under gravity. A fixing structure, including at least two clamping assemblies, is installed along the sliding path of the guide rod to hold and fix the guide rod in place. The clamping assemblies open layer by layer or selectively at different times from top to bottom, allowing the beads to fall smoothly layer by layer. When the clamping assemblies are closed, there is a certain probability that the beads will be caught. In the prior art, the clamping assemblies only have a groove that mates with the outer wall of the guide rod. After the clamping assemblies hold the guide rod, the adaptive axis position of the guide rod becomes the positioning center of the groove. However, since the outer diameter of the beads is larger than the outer diameter of the guide rod, the clamping assemblies open at a larger angle when holding the beads. The groove rotates as the clamping assemblies open, and the tilt angle of the clamping assemblies changes. The tilt angle of the groove on the clamping assemblies also changes as the groove rotates, and the positioning center shifts after the groove rotates. Therefore, when the chuck grips the bead, the bead's self-adapted axis position will deviate from the guide rod's self-adapted axis position when gripping the guide rod. Thus, when the chuck grips the bead, it will cause the bead to shift away from its original positioning center. For example... Figure 5 , 6 The positioning center of the chuck holding the guide rod is point A, and the positioning center of the chuck holding the bead is point B. Since the bead is located outside the guide rod, any deviation of the bead will also cause the guide rod to deviate, resulting in wobbling. The position of the guide rod needs to match the guide sleeve at the output end of the guide rod, and it needs to match the bead clamp at the lower end of the guide sleeve. If the guide rod deviates, the bead is likely to get stuck in the entrance or inside the guide sleeve, and it will be difficult for it to fall accurately into the clamping position of the bead clamp. Utility Model Content

[0004] To address the problems of the prior art, this utility model provides a positioning mechanism for a guide rod. The clamping head for holding the guide rod has clamping grooves that respectively cooperate with the guide rod and the bead, preventing the bead from causing the guide rod to deviate when the clamping head holds the bead. This makes the guide rod less prone to shaking and allows the bead to fall more smoothly.

[0005] The technical solution adopted is as follows:

[0006] A positioning mechanism for a guide bead rod includes at least two clamping assemblies for positioning the guide bead rod, and a driving structure for time-division opening and closing of a corresponding number of clamping assemblies. Each clamping assembly includes a pair of cooperating clamps. At least one clamping assembly has a first clamping groove and a second clamping groove at corresponding positions of the two clamps. The first clamping groove mates with the outer wall of the guide bead rod, and its positioning center when clamping the guide bead rod is the axis of the guide bead rod. The second clamping groove mates with the outer wall of a bead threaded onto the guide bead rod, and its positioning center when clamping a bead on the guide bead rod is the axis of the bead, and at this time, the axis of the bead coincides with the axis of the guide bead rod.

[0007] Furthermore, both sides of the first clamping groove and both sides of the second clamping groove are provided with arc-shaped transition surfaces.

[0008] Furthermore, the first clamping groove is located at the front end of the second clamping groove, that is, at the end away from the driving structure.

[0009] Furthermore, the clamp assembly includes a clamp mounting bracket for mounting the clamps, with the two clamps rotatably mounted at both ends of the clamp mounting bracket.

[0010] Furthermore, the drive structure includes a drive motor, a transmission shaft for transmitting power to the drive motor, and drive cams mounted on the transmission shaft and corresponding to the respective chuck assemblies.

[0011] Furthermore, a drive block is provided between the two chucks to drive the chucks to move and cooperate with the drive cam. The drive block and the corresponding parts of the pair of chucks are respectively provided with mutually cooperating drive teeth.

[0012] Furthermore, the chuck assembly at the top of the guide bead rod is provided with both a first and a second clamping groove, while other chuck assemblies are only provided with a first clamping groove.

[0013] Furthermore, the first clamping groove and / or the second clamping groove is an arc groove.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model provides a fixing structure for a guide rod, including a plurality of clamping head assemblies arranged vertically for clamping the guide rod. At least one clamping head assembly has a first clamping groove that cooperates with the guide rod and a second clamping groove that cooperates with the bead. When the first clamping groove clamps the guide rod, the axis of the guide rod coincides with the axis of the bead when the second clamping head clamps the bead. Therefore, the clamping head will not cause the bead to shift when clamping the bead, and the guide rod will not shift or shake due to the bead shifting. It is less likely that the bead will get stuck in the entrance or inside the guide sleeve. The subsequent bead feeding and dropping are more accurate and convenient for subsequent bead clamping. Attached Figure Description

[0015] Figure 1 A schematic diagram of the chuck holding the guide bead rod;

[0016] Figure 2 A schematic diagram of a chuck holding a bead;

[0017] Figure 3 for Figure 1 Enlarged view at point a;

[0018] Figure 4 for Figure 2 Enlarged view at point b;

[0019] Figure 5 A schematic diagram of an existing chuck for clamping beads;

[0020] Figure 6 for Figure 5 Enlarged view at point c;

[0021] Figure 7 This is a schematic diagram of the overall structure of the fixed structure;

[0022] Figure 8 This is a schematic diagram of the chuck assembly;

[0023] Among them, there are: guide rod 1, chuck assembly 2, chuck 201, chuck mounting bracket 202, drive structure 3, drive motor 301, transmission shaft 302, drive cam 303, drive block 304, first clamping groove 4, second clamping groove 5, drive tooth 6, return spring 9, and bead 10. Detailed Implementation

[0024] The present invention will be further described below with reference to specific embodiments.

[0025] refer to Figure 1-8 A positioning mechanism for a guide bead rod includes at least two clamping assemblies 2 for positioning the guide bead rod 1, and a driving structure 3 for driving the corresponding number of clamping assemblies 2 to open and close in a time-sharing manner. Each clamping assembly 2 includes a pair of cooperating clamps 201. At least one clamping assembly 2 has a first clamping groove 4 and a second clamping groove 5 respectively located at corresponding positions of the two clamps 201. The first clamping groove 4 cooperates with the outer wall of the guide bead rod, and its positioning center when clamping the guide bead rod is the axis of the guide bead rod. The second clamping groove 5 cooperates with the outer wall of the bead 10 threaded on the guide bead rod, and its positioning center when clamping the bead on the guide bead rod is the axis of the bead, and at this time, the axis of the bead coincides with the axis of the guide bead rod. Preferably, the first clamping groove 4 and / or the second clamping groove 5 are arc grooves. The grooves can also be square grooves or other shapes, and square grooves and arc grooves can also cooperate for clamping.

[0026] The clamp assembly 2 includes a clamp mounting bracket 202 for mounting the clamps, and the two clamps 201 are respectively rotatably mounted at both ends of the clamp mounting bracket 202.

[0027] In the prior art, all chuck assemblies 2 only have a first clamping groove 4, which mates with the outer wall of the guide rod to fix the guide rod. However, it cannot be ruled out that when the bead slides, the chuck may clamp the bead. But when the chuck clamps the bead, the outer diameter of the bead is larger, and the two chucks will rotate at a certain angle, causing the first clamping groove to rotate as well. The positioning center of the first clamping groove when clamping the bead will deviate from the axis of the guide rod. The "positioning center" refers to the axis of the guide rod or bead after self-adaptation when the clamping groove clamps the guide rod or bead. For example Figure 5 , 6 Point A is the positioning center of the chuck holding the guide bead rod, and point B is the positioning center of the chuck holding the bead. Point B is offset from point A. This offset of the positioning center of the chuck groove will cause the bead to shift. Since the bead is positioned outside the guide bead rod, it will cause the guide bead rod to shift as well, resulting in wobbling of the guide bead rod and affecting subsequent bead feeding. Therefore, only when the axis of the bead when the chuck is holding the bead is aligned with the axis of the guide bead rod when it is holding the guide bead rod will the bead not affect the position of the guide bead rod. Once the axis of the bead shifts too much, it will easily cause the position of the guide bead rod to shift.

[0028] The chuck is equipped with a first groove that mates with the outer wall of the guide rod and a second groove that mates with the outer wall of the bead. The positioning center of the first groove when holding the guide rod coincides with the axis of the guide rod, and the positioning center of the second groove when holding the bead coincides with the axis of the bead and also with the axis of the guide rod. Figure 2 , 4 The guide rod and the bead can be concentric, and the bead is less likely to affect the position of the guide rod.

[0029] Both sides of the first clamping groove 4 and both sides of the second clamping groove 5 are provided with arc-shaped transition surfaces 11. The arc-shaped transition surfaces are provided to prevent the guide rod or bead from being scratched when clamping the guide rod or bead.

[0030] The first clamping groove 4 is located at the front end of the second clamping groove 5, that is, at the end away from the driving structure.

[0031] The drive structure 3 includes a drive motor 301, a transmission shaft 302 for transmitting power to the drive motor 301, and drive cams 303 mounted on the transmission shaft 302 and corresponding to the respective chuck assemblies 2. A drive block 304 is provided between the two chucks 201 to drive the chucks and cooperate with the drive cams 303. The drive block 304 and the corresponding chucks 201 each have cooperating drive teeth 6. The corresponding end of the drive block 304 cooperates with the drive cam 303. Each drive cam 303 has a drive surface that rotates with the transmission shaft 302 to drive the drive block 304 to slide. The drive cam 303 corresponding to the corresponding chuck 201 rotates with the transmission shaft 302 to drive the corresponding chuck 201 to open intermittently. The multiple sets of chucks 201 open and close alternately. When the transmission shaft drives each set of ball chucks to open alternately, it must be ensured that at least one set of chuck assemblies 2 clamps the guide bead rod 1 at all times to prevent the guide bead rod 1 from falling off.

[0032] The drive block 304 can be further equipped with a reset spring 9 to keep the pair of chucks 201 of the chuck assembly 2 in a normally closed state. The drive block 304 is mainly used to open the pair of chucks 201 of the chuck assembly 2. The motor shaft of the drive motor 301 and the transmission shaft 302 can be connected by a synchronous belt assembly or other existing components.

[0033] In this embodiment, the chuck assembly 2 located at the uppermost end of the guide bead rod is provided with both a first and a second clamping groove, while other chuck assemblies 2 are only provided with the first clamping groove 4. Of course, multiple chuck assemblies 2 with both the first and second clamping grooves can be provided, or they can be set in different positions to ensure the stability of the guide bead rod, prevent the guide bead rod from shaking, and prevent the bead from getting stuck in the guide bead sleeve inlet or the guide bead hole of the guide bead sleeve, resulting in more accurate bead placement.

[0034] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A positioning mechanism for a guide bead rod, comprising a clamp assembly (2) for at least two positioning guide bead rods (1), and a drive structure (3) for driving a corresponding number of clamp assemblies (2) to open and close in a time-division manner, wherein the clamp assembly (2) comprises a pair of mutually cooperating clamps (201), characterized in that: At least one of the clamping assemblies (2) is provided with a first clamping groove (4) and a second clamping groove (5) at the corresponding positions of the two clamps (201). The first clamping groove (4) is engaged with the outer wall of the guide rod, and the positioning center of the first clamping groove (4) when clamping the guide rod is the axis of the guide rod. The second clamping groove (5) is engaged with the outer wall of the bead (10) threaded on the guide rod, and the positioning center of the second clamping groove (5) when clamping the bead on the guide rod is the axis of the bead, and at this time the axis of the bead coincides with the axis of the guide rod.

2. The positioning mechanism for the guide bead rod as described in claim 1, characterized in that: Both sides of the first clamping groove (4) and both sides of the second clamping groove (5) are provided with arc-shaped transition surfaces (11).

3. The positioning mechanism for the guide bead rod as described in claim 1, characterized in that: The first clamping groove (4) is located at the front end of the second clamping groove (5), that is, at the end away from the driving structure (3).

4. The positioning mechanism for the guide bead rod as described in claim 1, characterized in that: The clamp assembly (2) includes a clamp mounting bracket (202) for mounting the clamps, and the two clamps (201) are respectively rotatably mounted at both ends of the clamp mounting bracket (202).

5. The positioning mechanism for the guide bead rod as described in claim 1, characterized in that: The drive structure (3) includes a drive motor (301), a transmission shaft (302) for transmitting power from the drive motor (301), and drive cams (303) mounted on the transmission shaft (302) and corresponding to the respective chuck assemblies (2).

6. The positioning mechanism for the guide bead rod as described in claim 5, characterized in that: Between the two chucks (201), there is a drive block (304) that drives the chucks to move and cooperates with the drive cam (303). The drive block (304) and the corresponding parts of the pair of chucks (201) are respectively provided with mutually cooperating drive teeth (6).

7. The positioning mechanism for the guide bead rod as described in claim 1, characterized in that: The chuck assembly (2) located at the top of the guide bead rod is provided with both the first and second clamping slots, while the other chuck assemblies (2) are only provided with the first clamping slot (4).

8. The positioning mechanism for the guide bead rod as described in claim 1, characterized in that: The first clamping groove (4) and / or the second clamping groove (5) are arc grooves.

Images