Sole sewing machine

Abstract

The utility model provides a sole sewing machine. The shoe sole sewing machine comprises a working wheel and a pressing wheel. Materials to be sewn are pressed between the working wheel and the pressing wheel through the pressing wheel, the pressing wheel is pressed in a normal state during working, and the automatic arm lifting assembly can drive the materials to be lifted partially or completely so as to exit the pressing state. The automatic arm lifting assembly comprises an arm lifting driving piece used for driving the automatic arm lifting assembly to act, and the arm lifting driving piece is arranged on the outer side of a shell of the upper pulling machine. According to the shoe sole sewing machine, the problem that the lifting arm driving piece is prone to failure due to the influence of lubricating materials is solved by moving the lifting arm driving piece to the outside of the shell of the upper pulling machine. Therefore, the long-term work of the lifting arm driving piece can be ensured. And meanwhile, the specific position of the lifting arm driving piece can be reasonably arranged on the outer side of the shell to optimize the boundary dimension of the equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a sole sewing machine, and specifically to a sole sewing machine. Background Art

[0002] A sole sewing machine is a key piece of sewing equipment in the shoemaking process, used for wind-stitching shoe soles. Of course, sole sewing machines can also be used to sew other thicker products. Advances in miniaturized electric drive systems, such as the widespread use of stepper motors and permanent magnet motors, have enabled sole sewing machines to be miniaturized and integrated into limited workspaces on work surfaces. During operation, the working and pressure wheels of a sole sewing machine compress the sewing material and feed it as the working wheels rotate. Naturally, maintaining a sufficient pressure between the pressure and working wheels is essential for stable and reliable feeding. However, this also has a disadvantage: the compression prevents the material from easily changing direction during transport. Therefore, the pressure wheels of sole sewing machines are configured to be normally closed, but the degree of temporary release can be controlled by the operator. In the existing technology, the operator sews on the table with both hands, and the control of the pressure wheel is generally achieved by the lower limbs. A common solution is to use a pedal as a switch to fully open the pressure wheel for loading and unloading materials, and swing the knees left and right to drive the swing handle under the table to control the temporary loosening of the pressure wheel to an adjustable distance, that is, to change the degree of compression to facilitate the change of direction of the material.

[0003] In the prior art, as disclosed in the invention patent application entitled “A Presser Foot Lifting Mechanism for a Sewing Machine” with the publication number CN117026525A published by our partners, the driving member that drives the press wheel is generally placed inside the housing of the device. After testing and use, there is obvious room for optimization. The interior of the housing of a sewing machine is a chamber for the driving mechanism that drives the sewing machine. In order to ensure the long-term stable operation of the arm lifting mechanism and the head driving mechanism, the moving parts in the housing need to be lubricated. Therefore, lubricating oil or grease is scattered throughout the interior of the housing. For example, in a common solution, a lubricating oil dripping hole will be provided on the upper cover of the housing to ensure effective lubrication of the internal moving parts; or a lubricating oil chamber will be provided to continuously transport lubricating oil into the housing to ensure lubrication of the moving parts. The arm lift actuator is typically electrically driven, such as an electromagnet or motor, and is typically not protected from lubricants such as oil or grease. Placing the arm lift actuator inside the housing exposes it to long-term oil or grease contamination, leading to performance degradation and premature failure. This is especially true for solutions using electromagnets as the arm lift actuator. If lubricant or grease enters the electromagnet's internal operating space, it can hinder the movement of the arm lift. Utility Model Content

[0004] Aiming at the problem that the driving member of the pressure wheel movement of the existing sole sewing machine is easily invalidated due to the influence of lubricating oil intrusion, the utility model provides a sole sewing machine.

[0005] The technical solution of the present utility model provides a sole sewing machine, comprising a working wheel and a pressing wheel; the material to be sewn is pressed between the working wheel and the pressing wheel by the pressing wheel, and the pressing wheel is normally pressed when working, and can be driven by an automatic arm lifting assembly to partially or completely lift up to exit the pressing state; it is characterized in that the automatic arm lifting assembly includes an arm lifting drive component for driving the automatic arm lifting assembly to move, and the arm lifting drive component is arranged on the outside of the shell of the lasting machine.

[0006] Preferably, a concave area that can at least fully or partially accommodate the arm-lifting driving member is formed on the housing of the lasting machine, and the arm-lifting driving member is fixedly arranged in the concave area.

[0007] Preferably, the lasting machine further comprises a first driving member arranged on the outside of the casing, and the arm-lifting driving member and the first driving member are arranged on the same side of the outside of the casing.

[0008] Preferably, the lasting machine further includes an electric control box, which is installed on the outer surface of the shell and partially or completely covers the arm-lifting drive component and the first drive component.

[0009] Preferably, the arm-lifting driving member, the first driving member and the electric control box are placed on the outer surfaces of the left and right sides of the lasting machine when facing the operator.

[0010] Preferably, the lasting machine also includes a manual arm lifting assembly for manually controlling the lifting amplitude of the pressing wheel. The automatic arm lifting assembly and the manual arm lifting assembly drive the guide assembly independently of each other. The transmission links of the automatic arm lifting assembly driving the guide assembly and the manual arm lifting assembly driving the guide assembly are both unidirectional motion transmission with the guide assembly as the transmission end point.

[0011] Preferably, the lasting machine includes a guide assembly for guiding the pressing wheel, a pressing assembly for achieving normal pressing of the guide assembly, and the automatic arm lifting assembly includes a first connecting rod located in the transmission link from the arm lifting drive to the guide assembly, and the first connecting rod only transmits motion from the arm lifting drive to the guide assembly.

[0012] Preferably, when the pressure wheel is lifted, the first connecting rod is pulled, and the first connecting rod is a flexible connecting member.

[0013] Preferably, the first connecting rod has a sliding pair composed of two slidingly connected rods, and the two rods are respectively connected to the guide assembly and the arm lifting drive member through a transmission link. Under the lifting control, the two rods are in a dead point position away from each other, so when lifting, the two are relatively stationary at the dead point position to transmit motion.

[0014] Preferably, the arm lifting drive component is an electromagnet or a motor.

[0015] The shoe sole stitching machine of this invention addresses the issue of the arm lift driver being susceptible to failure due to the influence of lubricating materials by relocating the arm lift driver to the exterior of the machine's housing. The housing acts as a natural barrier between the internal lubricating oil and the external arm lift driver, ensuring the long-term operation of the arm lift driver. Furthermore, the specific positioning of the arm lift driver outside the housing can be rationally considered to optimize the device's overall dimensions, achieving a balanced effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of a conventional sole sewing machine according to the present invention;

[0017] Figure 2 Schematic diagram of a conventional sole sewing machine according to the present invention;

[0018] Figure 3 This is a schematic diagram of the principle of the sole sewing machine of the present utility model;

[0019] Figure 4 Schematic diagram of the housing of the sole sewing machine of the present invention;

[0020] Figure 5 This is a schematic diagram of the layout of the specific arrangement of the arm lift drive member 41 of the present invention;

[0021] Figure 6 Schematic diagram of the link of the lifting action of the mounting arm 13 of the present invention.

[0022] In the figure,

[0023] 11: Working wheel 12: Pressing wheel 13: Mounting arm 1: Arm lifting mechanism 2: Guide assembly 3: Pressing assembly 31: Spring 4: Automatic arm lifting assembly 41: Arm lifting drive 42: Concave area 43: Electric control box 44: First drive 45: Swing arm 46: First connecting rod 47: First lever 5: Manual arm lifting assembly 51: Arm lifting handle 52: Swing rod 521: Elastic element DETAILED DESCRIPTION

[0024] The following is a detailed description of the present invention in conjunction with the accompanying drawings and specific embodiments. In this specification, the size ratios in the drawings do not represent the actual size ratios, but are only used to reflect the relative positional relationship and connection relationship between the various components. Components with the same name or the same number represent similar or identical structures and are only for illustrative purposes.

[0025] Figure 1 and Figure 2 It is a structural diagram of an existing sole sewing machine. Figure 2 yes Figure 1 A schematic diagram showing a normal view of section B along the center view A. In short, the working area of ​​the sole sewing machine is located at section B and features a rotatable working wheel 11 and a pressure wheel 12. The pressure wheel 12 shown in the figure rotates with the machine. Specifically, during normal sewing, the material to be sewn extends in the direction shown in the figure and is compressed between the working wheel 11 and the pressure wheel 12. At this time, the working wheel 11 is driven, advancing the material to be sewn and simultaneously rotating the pressure wheel 12. When the sole sewing machine is turned on, it spends most of its time in normal sewing mode. Occasionally, it may be necessary to release the pressure or adjust the pressure force, such as when changing parts or adjusting the sewing direction. Therefore, the pressure wheel 12 is typically designed to be in a permanent state of compression, releasing it after an intervention. The pressure wheel 12 is rotatably mounted on a mounting arm 13. Release of the pressure wheel 12 is achieved by moving the mounting arm 13 a certain distance away from the working wheel 11. This means that the mounting arm 13 is movable. As shown in the figure, the working surfaces of the pressure wheel 12 and the mounting arm 13 are parallel, and can also be further arranged in the same plane. In this case, preferably, the mounting arm 13 moves along the radial direction of the working wheel 11 or parallel to the radial direction.

[0026] In the following text, the release of the pressure wheel 12 will be referred to as arm lifting (relative to the mounting arm 13) or wheel lifting (relative to the pressure wheel 12). In general, the sole sewing machine has an automatic arm lifting mode and a manual arm lifting mode. In the automatic arm lifting mode, after the operator outputs the operating instruction, the mounting arm 13 moves a set distance so that the pressure wheel 12 is away from the working wheel 11 by a set distance. Generally, this set distance can be the maximum stroke of the mounting arm 13, which can be applied to the loading and unloading operations of the material. In the manual arm lifting mode, as the intensity of the operating instruction changes, the moving distance of the mounting arm 13 also gradually changes. This means that a trained operator can control the body movements to make the pressure wheel 12 leave the working wheel 11 by the expected distance. The manual arm lifting mode is very necessary and can be used when bending stitches. At this time, controlling the pressure wheel 12 to appropriately move away from the working wheel 11 reduces the pressing force, which is convenient for adjusting the direction of the material to be sewn. At the same time, the pressure wheel 12 gives the material to be sewn enough pressing force so that it can still move forward steadily under the drive of the working wheel 11.

[0027] Figure 3A schematic diagram of the mechanical principle of the arm lifting control of the mounting arm 13 is given. This is only a simplified schematic diagram of the principle and does not represent the actual part structure and combination relationship. The mounting arm 13 is arranged on the guide assembly 2, and the clamping assembly 3 can be connected in parallel with the guide assembly 2. The clamping assembly 3 is normally tensioned or clamps the mounting arm 13 through other action modes. The automatic arm lifting assembly 4 and the manual arm lifting assembly 5 can respectively control the guide assembly 2 to overcome the movement of the clamping assembly 3 to realize the lifting of the mounting arm 13. In this regard, the internal structure of the sole sewing machine similar to the above principle has been disclosed in the "A Presser Foot Lifting Mechanism of a Sewing Machine" with application number CN202311045131.7.

[0028] In the prior art, as disclosed in the invention patent application entitled "A Presser Foot Lifting Mechanism for a Sewing Machine" with the publication number CN117026525A published by our partners, in general, in the prior art, an arm lifting drive 41 is provided in the automatic arm lifting assembly 4, and the arm lifting drive 41 is connected to the guide assembly 2 through the recessed area 42. By controlling the action of the arm lifting drive 41, the initial restriction of the spring 31 is overcome so that the pressure wheel 12 is lifted as required. However, in the prior art, the arm lifting drive 41 is generally provided inside the casing. After testing and use, it is found that there is obvious room for optimization. Similar to the casing of a sewing machine, the inside of the casing is a driving mechanism that drives the sewing machine to move. In order to ensure the long-term stable operation of the arm lifting mechanism and the head driving mechanism, etc., the moving parts in the casing need to be lubricated. Therefore, lubricating oil or grease is scattered everywhere inside the casing. In some designs, a lubricating oil chamber may be provided to continuously transport lubricating oil into the casing to ensure the lubrication of the moving parts. The arm lift actuator 41 is typically electrically driven, such as by an electromagnet or motor, and is typically not protected from lubricating oil or grease. Placing the arm lift actuator 41 inside the housing exposes it to the aforementioned oil or grease contamination for extended periods, leading to performance degradation and premature failure. This is especially true for designs using electromagnets as the arm lift actuator 41. If lubricating oil or grease enters the electromagnet's internal operating space, it can hinder the movement of the arm lift actuator.

[0029] Figure 4This is a schematic diagram of the improved sole stitching machine housing. After the improvement, the arm lift drive member 41 is preferably located outside the housing. Specifically, the housing wall divides the inner and outer areas, with the mechanical transmission mechanism installed in the inner area and the outer area separated from the inner area by the wall. The outer area includes not only the visible area of ​​the housing but also the non-visible area of ​​the housing. Since the arm lift drive member 41 is located outside the housing, it can be physically isolated from the lubricating oil / grease inside the housing by the housing wall, thus ensuring that the arm lift drive member 41 is in a good working environment and avoiding affecting the performance and life of the arm lift drive member 41. Specifically, the arm lift drive member 41 can be arranged with the action axis parallel to the movement direction of the guide assembly 2 as in the prior art. Generally, this means that the arm lift drive member 41 is located at the rear of the sole stitching machine and is directly fixed to the rear outer side of the sole stitching machine housing. The disadvantage is that if the housing is not improved and the arm lift drive member 41 is mechanically installed outside the housing, the exposure of the arm lift drive member 41 will lead to an increase in the overall size of the sole stitching machine. Therefore, we can further Figure 4 As shown on the right, a concave area 42 is formed on the shell body which can be used to at least fully or partially accommodate the arm lift drive 41. The concave area 42 can pass through the surface of one side of the shell body as shown in the figure, or it can be formed locally on the surface of one side of the shell body. It depends on the process requirements. The above partial accommodation means that the arm lift drive 41 may partially protrude from the concave area 42, such as being higher than the shell surface along its axial direction. Of course, it is preferred to fully accommodate it to reduce the overall size of the sole stitching machine. Naturally, in this solution, the automatic arm lift assembly 4 is not limited to the arm lift drive 41, but can also be other drive components, such as a motor, a pneumatic motor, a hydraulic motor, etc. It can be imagined that Figure 4 In the technical solution, the internal transmission structure design can refer to the existing technology or the transmission structure design based on the later text of this application.

[0030] Furthermore, the sole sewing machine can be used as Figure 5 Design shown. Figure 5 The left is a schematic diagram of the installed electric control box. Figure 5 The right side shows the schematic diagram of the exposed drive unit after removing the electric control box and the electrical accessories inside. Figure 5 As shown on the right, the sole sewing machine is generally provided with more than one driving member, for example, it has a first driving member 44 for driving the periodic action of the core shuttle and the sewing needle. To this end, it is preferred to arrange the arm-lifting driving member 41 and the first driving member 44 on the same side of the outer shell, so that the contribution of the arm-lifting driving member 41 and the first driving member 44 to the overall area of ​​the machine overlaps, thereby achieving the effect of reducing the overall volume of the equipment, as shown in FIG. Figure 5As shown on the right, the size of the arm-lifting driver 41 may be smaller than the first driver 44, so the arm-lifting driver 41 is within the overall volume increased by the first driver 44 and hardly contributes to the increase of the overall volume. Which side of the sole stitching machine is specifically placed is determined by the design. This can be used as a realization of the present application. However, preferably, the electrical components for the sole stitching machine drive control can also be integrated and integrated into the space expanded by the arm-lifting driver 41 and the first driver 44 on the side of the sole stitching machine. For this, an electric control box 43 that can be installed on the housing and partially or completely covers the arm-lifting driver 41 and the first driver 44 can be provided to realize the protection of the arm-lifting driver 41 and the first driver 44 and the electrical integration. The surface of the electric control box 43 facing the operating side can have a human-machine interface that interacts with the personnel. For this reason, the above-mentioned arm-lifting driver 41, the first driver 44 and the electric control box 43 can be placed on the outer surface of the left and right sides of the sole stitching machine when facing the operator, with the human-machine interface facing the operator.

[0031] The arm lift drive 41 can be an electromagnet, but is preferably a motor assembly. The reason is that, generally speaking, in order to overcome the clamping force of the clamping assembly 3, the arm lift drive 41 requires a large driving force to open the mounting arm 13, which means that a large driving current is required. For an electromagnet, this means that a separate power supply and control circuit needs to be designed for the arm lift drive 41 to ensure the reliable operation of the electromagnet. However, the use of motor control can basically avoid redesigning the circuit. The motor power supply and control circuit can usually be synchronously integrated with the drive circuit of the first drive member 44, etc., sharing some circuits and devices, and can reduce the current value of the arm lift drive 41 when it is working, thereby providing more stable, reliable and accurate arm lift control. When using a motor assembly, a stepper motor or other product can be used so that it can maintain torque after a certain angle of rotation under control. Obviously, the motor's rotation angle can be converted into linear movement by a swing arm or other means to act on the aforementioned guide assembly 2.

[0032] Figure 6The figure is a schematic diagram of the internal structure of the arm lifting mechanism 1 when the arm lifting drive 41 is placed on the side. The arm lifting drive 41 is connected to the guide assembly 2 through a transmission mechanism. When it is controlled to move, the guide assembly 2 overcomes the pressing force of the clamping assembly 3 and lifts up. Once the arm lifting drive 41 is restored, the guide assembly 2 is reset. The artificial arm lifting assembly 5 includes an arm lifting handle 51 for artificial knee-lifting. The arm lifting handle 51 is connected to the guide assembly 2 through a transmission mechanism. When it is controlled to move, the guide assembly 2 overcomes the pressing force of the clamping assembly 3 and moves a certain distance following the movement of the guide assembly 2. This realizes the fine control of the arm lifting distance by the arm lifting handle 51, which is not available for the arm lifting drive 41. In order to realize that the automatic arm lifting assembly 4 and the manual arm lifting assembly 5 drive the guide assembly 2 independently of each other (mutual independence means that when either the automatic arm lifting assembly 4 or the manual arm lifting assembly 5 drives the guide assembly 2, it does not affect the position of the other one), the transmission links of the automatic arm lifting assembly 4 driving the guide assembly 2 and the manual arm lifting assembly 5 driving the guide assembly 2 are both unidirectional, and can only be transmitted from the automatic arm lifting assembly 4 to the guide assembly 2 and from the manual arm lifting assembly 5 to the guide assembly 2. This is especially necessary when the arm lifting drive 41 is a motor. If the motion transmission is bidirectional, when the manual arm lifting assembly 5 drives the guide assembly 2, the arm lifting drive 41 may hinder the movement of the guide assembly 2 due to the presence of the positioning torque of the arm lifting drive 41.

[0033] Figure 6Further provided are a schematic diagram of the transmission link of the automatic arm lifting assembly 4 (upper right) and a schematic diagram of the transmission link of the manual arm lifting assembly 5 (lower right). For the transmission link of the automatic arm lifting assembly 4, the figure is an example, in which the swing arm 45 is connected to the output shaft of the arm lifting drive 41, or is connected to the output shaft that is connected to the arm lifting drive 41 through several transmission systems. The first lever 47 can rotate around the axis, one end of which is connected to the swing arm 45 via the first connecting rod 46, and the other end is connected to the guide assembly 2 via a connecting member. Once the swing arm 45 rotates, the movement of the guide assembly 2 can be achieved through the above-mentioned transmission system. Preferably, the first connecting rod 46 should be a one-way transmission motion, that is, only the arm lifting drive 41 is allowed to transmit power to the first lever 47, and cannot be transmitted in the opposite direction. Since in the present embodiment, the first connecting rod 46 is pulled during the lifting process of the control mounting arm 13, it is necessary for the first connecting rod 46 to play a transmission role only when it is pulled, and not to transmit motion when it is compressed. To achieve this movement of the first connecting rod 46, in this particular embodiment, the first connecting rod 46 can use a flexible connector, such as a soft rope, a thin steel rope, a chain, or a cable. Alternatively, the technical solution shown in the figure can be employed, wherein the first connecting rod 46 comprises a sliding pair consisting of two slidingly connected rods, the two rods being connected to the first lever 47 and the swing arm 45, respectively. Under the lifting control, the two rods are at a stop position in a state of moving away from each other. Therefore, under the lifting control, the two rods are relatively stationary at this stop position, and the first connecting rod 46 formed by them can transmit motion. Conversely, in other situations, such as when the mounting arm 13 is lifted and the arm lift driver 41 is not actuated, the first lever 47 rotates to compress the rod of the first connecting rod 46, while the arm lift driver 41 remains stationary due to the presence of a holding torque. At this point, the two sliding rods of the first connecting rod 46 slide closer together, absorbing the motion of the first lever 47. This design can precisely achieve one-way transmission of the mounting arm 13, which can play a key role described later when a manual arm lift assembly 5 is present.

[0034] The above content is only a description of the preferred implementation mode of the present invention, and does not limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solution of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A shoe sole sewing machine, comprising a working wheel (11) and a pressing wheel (12); the material to be sewn is pressed between the working wheel (11) and the pressing wheel (12) by the pressing wheel (12); the pressing wheel (12) is normally pressed when working, and can be driven by an automatic arm lifting assembly (4) to be partially or completely lifted to exit the pressing state; characterized in that: The automatic arm lifting assembly (4) comprises an arm lifting driving member (41) for driving the automatic arm lifting assembly (4) to move, and the arm lifting driving member (41) is arranged outside the shell of the lasting machine.

2. The sole stitching machine according to claim 1, characterized in that: An inner concave area (42) capable of at least fully or partially accommodating an arm-lifting driving member (41) is formed on the shell of the lasting machine, and the arm-lifting driving member (41) is fixedly arranged in the inner concave area (42).

3. The sole stitching machine according to claim 1, characterized in that: The lasting machine also has a first driving member (44) arranged on the outside of the housing, and the arm-lifting driving member (41) and the first driving member (44) are arranged on the same side of the outside of the housing.

4. The sole stitching machine according to claim 3, characterized in that: The lasting machine further comprises an electric control box (43), which is mounted on the outer surface of the shell and partially or completely covers the arm-lifting driving component (41) and the first driving component (44).

5. The sole stitching machine according to claim 4, characterized in that: The arm-lifting driving member (41), the first driving member (44) and the electric control box (43) are placed on the outer surfaces of the left and right sides of the lasting machine when the lasting machine faces the operator.

6. The shoe sole stitching machine according to claim 1, characterized in that: The lasting machine further comprises an artificial arm lifting assembly (5) for artificially controlling the lifting range of the pressing wheel (12); the automatic arm lifting assembly (4) and the artificial arm lifting assembly (5) independently drive the guide assembly (2); the transmission links of the automatic arm lifting assembly (4) driving the guide assembly (2) and the artificial arm lifting assembly (5) driving the guide assembly (2) are both unidirectional motion transmission with the guide assembly (2) as the transmission end point.

7. The shoe sole stitching machine according to claim 1, characterized in that: The lasting machine comprises a guide assembly (2) for guiding the pressing wheel (12), a clamping assembly (3) for achieving normal clamping of the guide assembly (2), and the automatic arm lifting assembly (4) comprises a first connecting rod (46) located in a transmission chain from the arm lifting drive member (41) to the guide assembly (2), and the first connecting rod (46) only transmits movement from the arm lifting drive member (41) to the guide assembly (2).

8. The shoe sole stitching machine according to claim 7, characterized in that: When the pressure wheel (12) is lifted, the first connecting rod (46) is pulled, and the first connecting rod (46) is a flexible connecting member.

9. The shoe sole stitching machine according to claim 7, characterized in that: The first connecting rod (46) has a sliding pair composed of two slidably connected rods, and the two rods are respectively connected to the guide component (2) and the arm lifting drive component (41) through a transmission link. Under lifting control, the two rods are in a dead point position away from each other, so that when lifting, the two rods are relatively still at the dead point position to transmit movement.

10. The shoe sole stitching machine according to claim 1, characterized in that: The arm lifting driving component (41) is an electromagnet or a motor.

Images