A sewing machine feed trajectory adjustment cam assembly

Abstract

The utility model relates to sewing machine technical field discloses a sewing machine cloth feeding track adjustment cam assembly, including spindle, the outside coaxial of spindle is equipped with first shoulder, the inside fixed connection of first shoulder has the locating sleeve, both sides of locating sleeve all are fixedly connected with the butt joint block, two second shoulders, symmetrical setting are equipped with in the outside of locating sleeve, two second shoulders all are fixedly connected with annular seat one side of mutual approaching, the utility model discloses through the installation process of simplifying second shoulder whole by clamping assembly, has reduced the installation difficulty of second shoulder whole, so realized the quick assembly of cam assembly, through the slider, the sliding slot is favorable to improving the working stability of clamping assembly, through adjusting assembly can remove the restriction of clamping assembly to second shoulder whole, so the subsequent cam assembly maintenance work is convenient to carry out, is favorable for the reduction of sewing machine maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, specifically to a cam assembly for adjusting the fabric feed trajectory of a sewing machine. Background Technology

[0002] A sewing machine is a device used to form stitches on sewing materials. It interweaves or sews together one or more layers of fabric using one or more sewing threads. The key components of a sewing machine include the machine head, needle bar, feed device, thread roller, and universal joint. The feed device is mainly used to drive the feed dog and the feed dog mounted on the feed dog to move along a preset feed trajectory, thereby achieving the feeding of fabric.

[0003] When using existing sewing machine feed trajectory adjustment cam assemblies, workers use screws and other fasteners to position and fix the cam assembly on the outside of the main shaft. Since most feed device cam assemblies are one-piece designs, if one of the feed eccentric wheel or the tooth lifting eccentric wheel in the cam assembly is damaged, the entire cam assembly must be discarded and replaced with a new one. This increases the maintenance cost of the sewing machine to some extent and is not conducive to the maintenance and repair of the feed device. Utility Model Content

[0004] The purpose of this invention is to provide a cam assembly for adjusting the feed path of a sewing machine, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a cam assembly for adjusting the fabric feed trajectory of a sewing machine, comprising:

[0006] The main shaft has a first shoulder coaxially provided on its outer side, and a positioning sleeve is fixedly connected inside the first shoulder. Both sides of the positioning sleeve are fixedly connected to a mating block.

[0007] Two second shoulders are symmetrically arranged on the outside of the positioning sleeve. An annular seat is fixedly connected to the side of the two second shoulders that are close to each other. Two arc-shaped connecting parts are symmetrically installed on one side of the annular seat.

[0008] A receiving cavity is provided inside the docking block. Push-pull blocks are provided on both sides of the inner cavity of the receiving cavity. One end of the push-pull block is provided with a locking component for limiting the displacement of the arc-shaped connection part. An adjustment component is provided inside the receiving cavity to adjust the position of the push-pull block.

[0009] Preferably, the engaging assembly includes slots at both ends of the arc-shaped connecting portion, and one end of the push-pull block extends into the interior of the slot and is fixedly connected to a locking block.

[0010] Preferably, a slider is fixedly connected to one side of the push-pull block, and a groove corresponding to the slider is opened on the inner wall of the receiving cavity. The slider is located inside the groove, and a relief groove is opened on one side of the slider. A second spring is provided between adjacent relief grooves, and the second spring is connected to the relief grooves at both ends respectively.

[0011] Preferably, the arc-shaped connecting part and the axis of the positioning sleeve are in the same plane, and the positioning sleeve is connected to the main shaft by screws.

[0012] Preferably, the adjustment assembly includes a strip seat disposed inside the receiving cavity, with wedge blocks fixedly connected to both ends of the strip seat, and a wedge groove corresponding to the wedge block is provided on one side of the push-pull block, with one side of the wedge block contacting the wedge groove.

[0013] Preferably, a guide post is fixedly connected to one side of the strip seat, one end of the guide post extends through to the outside of the docking block and is fixedly connected to a pressing plate, and a first spring is coaxially provided around the guide post, the first spring being connected to the pressing plate and the docking block respectively.

[0014] Preferably, one of the second shoulders is fixedly connected to a feeding eccentric wheel on one side, and the other second shoulder is fixedly connected to a tooth lifting eccentric wheel on one side.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] This invention restricts the displacement of the second shoulder assembly through the locking component, simplifying the installation process and reducing the installation difficulty of the second shoulder assembly, thus enabling rapid assembly of the cam assembly. The slider and groove ensure smooth sliding of the push-pull block assembly, which improves the working stability of the locking component. The adjustment component can remove the restriction of the locking component on the second shoulder assembly, facilitating subsequent maintenance of the cam assembly and reducing sewing machine maintenance costs. Attached Figure Description

[0017] Figure 1 A schematic diagram of a preferred embodiment of the cam assembly for adjusting the fabric feed trajectory of a sewing machine provided by this utility model;

[0018] Figure 2 A schematic diagram of the specific structure of the positioning sleeve provided by this utility model;

[0019] Figure 3 A schematic diagram of the specific structure of the docking block provided by this utility model;

[0020] Figure 4 A schematic diagram of the specific structure of the arc-shaped connecting part provided by this utility model;

[0021] Figure 5 A schematic diagram of the adjustment component structure provided by this utility model;

[0022] Figure 6 This is a schematic diagram of the snap-fit ​​assembly structure provided by this utility model.

[0023] In the diagram: 1. Main shaft; 2. First shoulder; 3. Positioning sleeve; 4. Connecting block; 5. Second shoulder; 6. Annular seat; 7. Arc-shaped connecting part; 8. Feeding eccentric wheel; 9. Tooth lifting eccentric wheel; 10. Receiving cavity; 11. Push-pull block; 12. Engaging assembly; 121. Locking block; 122. Locking groove; 13. Adjusting assembly; 131. Strip seat; 132. Wedge block; 133. Wedge groove; 14. Guide post; 15. First spring; 16. Pressing plate; 17. Slide groove; 18. Slider; 19. Relief groove; 20. Second spring. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-6 As shown, a cam assembly for adjusting the fabric feed trajectory of a sewing machine includes a main shaft 1. A first shoulder 2 is coaxially provided on the outer side of the main shaft 1. A positioning sleeve 3 is fixedly connected inside the first shoulder 2. A docking block 4 is fixedly connected to both sides of the positioning sleeve 3. Two second shoulders 5 are symmetrically arranged on the outer side of the positioning sleeve 3. An annular seat 6 is fixedly connected to the side of the two second shoulders 5 that are close to each other. Two arc-shaped connecting parts 7 are symmetrically installed on one side of the annular seat 6. A receiving cavity 10 is provided inside the docking block 4. Push-pull blocks 11 are provided on both sides of the inner cavity of the receiving cavity 10. One end of block 11 is provided with a locking component 12 for limiting the displacement of the arc-shaped connecting part 7. By setting the locking component 12, the installation process of the second shoulder 5 as a whole is simplified and the installation difficulty of the second shoulder 5 as a whole is reduced, thus realizing the rapid assembly of the cam assembly. The cavity 10 is provided with an adjustment component 13 that can adjust the position of the push-pull block 11. By setting the adjustment component 13, the restriction of the locking component 12 on the second shoulder 5 as a whole can be released, which facilitates the subsequent inspection and maintenance of the cam assembly and helps to reduce the maintenance cost of the sewing machine.

[0026] The engaging assembly 12 includes slots 122 located at both ends of the arc-shaped connecting portion 7. One end of the push-pull block 11 extends through the interior of the slot 122 and is fixedly connected to a locking block 121. Figure 2 , Figure 5 As shown, by inserting the locking block 121 at one end of the push-pull block 11 into the locking slots 122 at both ends of the arc-shaped connecting part 7, the displacement of the second shoulder 5 as a whole can be restricted, thereby realizing the quick assembly between the first shoulder 2 as a whole and the second shoulder 5 as a whole.

[0027] A slider 18 is fixedly connected to one side of the push-pull block 11. A groove 17 corresponding to the slider 18 is provided on the inner wall of the receiving cavity 10. The slider 18 is located inside the groove 17. A relief groove 19 is provided on one side of the slider 18. A second spring 20 is provided between adjacent relief grooves 19. The second spring 20 is connected to both ends of the relief groove 19, such as... Figure 5 , Figure 6 As shown, by setting the slider 18 and the slide groove 17, the push-pull block 11 can be kept smooth during the sliding process. The second spring 20 between the relief grooves 19 can make the locking block 121 at one end of the push-pull block 11 firmly inserted into the locking grooves 122 at both ends of the arc-shaped connecting part 7, which helps to improve the working stability of the locking assembly 12.

[0028] The arc-shaped connecting part 7 and the axis of the positioning sleeve 3 are in the same plane. The positioning sleeve 3 is connected to the main shaft 1 by screws, such as... Figure 1 , Figure 2 and Figure 3 As shown, in actual use, before fixing the two second shoulders 5 as a whole, the positioning sleeve 3 can be installed on the outside of the main shaft 1 using screws.

[0029] The adjustment assembly 13 includes a strip-shaped seat 131 disposed inside the receiving cavity 10. Wedge-shaped blocks 132 are fixedly connected to both ends of the strip-shaped seat 131. A wedge-shaped groove 133 corresponding to the wedge-shaped block 132 is formed on one side of the push-pull block 11. One side of the wedge-shaped block 132 contacts the wedge-shaped groove 133. Figure 5 As shown, the strip seat 131 can drive the wedge block 132 into the corresponding wedge groove 133. As the wedge block 132 goes deeper, it will force the locking block 121 at one end of the push-pull block 11 to leave the locking groove 122 at both ends of the arc-shaped connecting part 7, thereby releasing the restriction of the locking assembly 12 on the second shoulder 5 as a whole, which facilitates the subsequent inspection and maintenance of the cam assembly.

[0030] A guide post 14 is fixedly connected to one side of the strip seat 131. One end of the guide post 14 extends through to the outside of the mating block 4 and is fixedly connected to a pressing plate 16. A first spring 15 is coaxially provided around the guide post 14. The first spring 15 is connected to the pressing plate 16 and the mating block 4 respectively. Figure 3 , Figure 5As shown, the pressing plate 16 can drive the strip seat 131 to move closer to the wedge groove 133, which facilitates the adjustment of the position of the push-pull block 11. After the second shoulder 5 is completely inspected and replaced, the elastic potential energy of the first spring 15 can drive the strip seat 131 back to its original position, thus achieving the positioning and fixing of the second shoulder 5 as a whole again.

[0031] One side of one of the second shoulder blocks 5 is fixedly connected to a feed eccentric wheel 8, and one side of the other second shoulder block 5 is fixedly connected to a tooth-lifting eccentric wheel 9, as shown. Figure 1 , Figure 2 As shown, the feed eccentric wheel 8 and the tooth lifting eccentric wheel 9 are respectively installed on the outside of the two second shoulders 5. Compared with the common integrated cam assembly, when one of the feed eccentric wheel 8 and the tooth lifting eccentric wheel 9 malfunctions or is damaged, the operator can simply remove the corresponding second shoulder 5 and replace it with a new one, which helps to reduce the maintenance cost of the sewing machine.

[0032] Working principle: First, the operator uses screws to install the positioning sleeve 3 on the outside of the main shaft 1 of the sewing machine's feeding device. Then, the displacement of the second shoulder 5 is restricted by the locking assembly 12, which simplifies the installation process of the second shoulder 5 and reduces its installation difficulty, thus achieving rapid assembly of the cam assembly. During this process, the slider 18 and the slide groove 17 ensure smooth sliding of the push-pull block 11, which helps improve the working stability of the locking assembly 12. When one of the feeding eccentric wheel 8 or the lifting tooth eccentric wheel 9 malfunctions or is damaged, the locking assembly 12 can be released from its restriction on the second shoulder 5 by adjusting the assembly 13. This facilitates subsequent maintenance of the cam assembly and helps reduce the sewing machine's maintenance costs.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cam assembly for adjusting the fabric feed trajectory of a sewing machine, characterized in that, include: A main shaft (1) is provided with a first shoulder (2) on the outer side of the main shaft (1). A positioning sleeve (3) is fixedly connected inside the first shoulder (2). A docking block (4) is fixedly connected on both sides of the positioning sleeve (3). Two second shoulders (5) are symmetrically arranged on the outside of the positioning sleeve (3). An annular seat (6) is fixedly connected to the side of the two second shoulders (5) that are close to each other. Two arc-shaped connecting parts (7) are symmetrically installed on one side of the annular seat (6). A receiving cavity (10) is provided inside the docking block (4). Push-pull blocks (11) are provided on both sides of the inner cavity of the receiving cavity (10). One end of the push-pull block (11) is provided with a locking component (12) for limiting the displacement of the arc-shaped connecting part (7). An adjustment component (13) for adjusting the position of the push-pull block (11) is provided inside the receiving cavity (10).

2. The cam assembly for adjusting the fabric feed trajectory of a sewing machine according to claim 1, characterized in that: The engaging assembly (12) includes slots (122) at both ends of the arc-shaped connecting part (7), and one end of the push-pull block (11) extends into the inside of the slot (122) and is fixedly connected to a block (121).

3. The cam assembly for adjusting the fabric feed trajectory of a sewing machine according to claim 1, characterized in that: A slider (18) is fixedly connected to one side of the push-pull block (11). A groove (17) corresponding to the slider (18) is provided on the inner wall of the receiving cavity (10). The slider (18) is located inside the groove (17). A relief groove (19) is provided on one side of the slider (18). A second spring (20) is provided between adjacent relief grooves (19). The second spring (20) is connected to the relief grooves (19) at both ends respectively.

4. The cam assembly for adjusting the fabric feed trajectory of a sewing machine according to claim 1, characterized in that: The arc-shaped connecting part (7) and the positioning sleeve (3) are on the same plane, and the positioning sleeve (3) is connected to the main shaft (1) by screws.

5. A cam assembly for adjusting the fabric feed trajectory of a sewing machine according to claim 1, characterized in that: The adjustment assembly (13) includes a strip seat (131) disposed inside the receiving cavity (10). Both ends of the strip seat (131) are fixedly connected to wedge blocks (132). A wedge groove (133) corresponding to the wedge block (132) is opened on one side of the push-pull block (11). One side of the wedge block (132) is in contact with the wedge groove (133).

6. A cam assembly for adjusting the fabric feed trajectory of a sewing machine according to claim 5, characterized in that: A guide post (14) is fixedly connected to one side of the strip seat (131). One end of the guide post (14) extends through to the outside of the docking block (4) and is fixedly connected to a pressing plate (16). A first spring (15) is coaxially provided on the periphery of the guide post (14). The first spring (15) is connected to the pressing plate (16) and the docking block (4) respectively.

7. A cam assembly for adjusting the fabric feed trajectory of a sewing machine according to claim 1, characterized in that: One of the second shoulder blocks (5) is fixedly connected to one side of a feeding eccentric wheel (8), and the other of the second shoulder blocks (5) is fixedly connected to one side of a tooth lifting eccentric wheel (9).

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