Interaction quantity speed limiting structure of sewing machine head

Abstract

The utility model provides an interaction quantity speed limiting structure of a sewing machine head, and belongs to the technical field of sewing machines. The problem that sewing is affected after the interaction amount of an existing sewing machine is increased is solved. According to the interaction quantity speed limiting structure of the sewing machine head, a sewing machine comprises the machine head and a main shaft rotationally connected into the machine head, the main shaft is connected with an adjusting assembly, and the adjusting assembly is provided with an adjusting shaft capable of rotating and adjusting the interaction quantity of a presser foot. The rotary rheostat comprises a measuring seat fixed in the machine head and an input shaft rotationally connected to the measuring seat, the input shaft is fixedly mounted on the adjusting shaft, a mounting plate is fixedly connected to the machine head, the mounting plate and the input shaft are axially connected and limited, and the adjusting shaft can drive the input shaft to rotate relative to the measuring seat. According to the interaction quantity speed limiting structure of the sewing machine head, the sewing speed is achieved by detecting the rotating angle of the adjusting shaft, and sewing is not affected while the interaction quantity of the presser foot is detected.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing machines and relates to an interaction amount speed limiting structure of a sewing machine head. Background Art

[0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material, so as to interweave or sew together one or more layers of sewing materials. When sewing sewing materials with different thicknesses, it is necessary to adjust the interaction amount of the inner and outer presser feet. Especially when sewing relatively thick sewing materials, it is necessary to adjust the interaction amount of the inner and outer presser feet to be relatively large. When the interaction amount of the inner and outer presser feet is large, during the sewing process, the impact on the sewing material is too large, generating a large amount of noise and damaging the sewing material.

[0003] In view of the above problems, for example, Chinese Patent Application [Authorization Publication No.: CN109440308A] discloses an automatic adjustment device for the alternate amount of the upper presser foot of a sewing machine. The sewing machine includes a presser foot rod and an outer presser foot provided at the lower end of the presser foot rod. The automatic adjustment device includes a stepping motor, a swing shaft and an adjustment crank. A swing crank capable of swinging under the drive of the stepping motor is connected to the output shaft of the stepping motor. An adjustment link capable of adjusting the length is connected to the swing crank. One end of the adjustment link is hinged to the end of the swing crank. The other end of the adjustment link is rotatably connected to a limit screw. The adjustment crank is fixedly provided on the swing shaft and has a waist-shaped hole along the radial direction of the swing shaft. The fiber screw is slidably inserted into the waist-shaped hole. The swing shaft is connected to the presser foot rod through a presser foot lifting crank and can drive the presser foot rod to reciprocate up and down. A sewing material thickness detection mechanism is provided directly in front of the outer presser foot. The sewing material thickness detection mechanism includes a cloth guiding wheel, a detection sensor, an input shaft and a mounting rod fixedly installed on the presser foot rod. The lower end of the mounting rod is hinged to the upper end of the input shaft. The cloth guiding wheel is rollingly connected to the lower end of the input shaft. A return torsion spring capable of swinging the input shaft downward is provided between the lower end of the mounting rod and the upper end of the input shaft. The detection sensor is located above the cloth guiding wheel.

[0004] The above structure is that when the interaction amount of the inner and outer presser feet is large, by providing a detection sensor above the cloth guiding wheel, when the detection sensor detects that the sewing material becomes thicker, the cloth guiding wheel swings up the step, and then the detected signal is transmitted to the controller, and the stepping motor in the controller is used to adjust the interaction amount of the presser feet. However, the arrangement of the guiding wheel and the detection sensor near the presser foot will affect the user's observation of the sewing stitch and components such as the sewing needle during the sewing process. Therefore, it will affect the normal sewing activity and cause inconvenience in sewing. Summary of the Utility Model

[0005] The object of the present utility model is to address the above problems existing in the prior art and propose an interaction volume speed limiting structure for a sewing machine head. The technical problem to be solved by the present utility model is: how to solve the problem that the sewing is affected after the interaction volume of the existing sewing machine increases.

[0006] The object of the present utility model can be achieved by the following technical solutions:

[0007] An interaction volume speed limiting structure for a sewing machine head. The sewing machine includes a head and a main shaft rotatably connected inside the head. An adjusting assembly is connected to the main shaft. The adjusting assembly has an adjusting shaft that can rotate and adjust the interaction volume of the presser foot. It is characterized in that this interaction volume speed limiting functional structure includes a rotary variable resistor. The rotary variable resistor includes a measuring seat fixed inside the head and an input shaft rotatably connected to the measuring seat. The input shaft is fixedly installed on the adjusting shaft. A mounting plate is fixedly connected to the head. The mounting plate is axially connected to and limits the input shaft. The adjusting shaft can drive the input shaft to rotate relative to the measuring seat.

[0008] Working principle: According to the thickness of the sewing material, the interaction volume of the presser foot is adjusted by rotating the adjusting shaft. The rotation of the adjusting shaft drives the rotation of the input shaft. And a mounting plate is fixedly connected to the head. The mounting plate is axially connected to and limits the input shaft. When the input shaft rotates, the mounting plate remains stationary. The measuring seat is fixed inside the head. The resistance value can be measured according to the rotation of the input shaft relative to the measuring seat. The measuring seat is electrically connected to an external processor. The measuring seat measures the resistance value and feeds it back to the external processor. The processor adjusts the sewing speed according to the fed-back resistance value. When the resistance value is larger, the speed is slower, thereby reducing the instability of sewing caused by a large interaction volume of the presser foot. The above structure directly connects an input shaft to the adjusting shaft and circumferentially fixes the input shaft and the adjusting shaft. The interaction volume of the presser foot is monitored in real time through the relative rotation amount of the input shaft and the measuring seat, and the control of the sewing speed is realized through an external processor, achieving speed limiting when the interaction volume of the presser foot is large, and further improving the sewing stability of the sewing machine for sewing materials of various thicknesses. And in this application, a rotary variable resistor is added to the adjusting shaft of the head, and a mounting plate is provided on the head to axially limit the input shaft in the rotary variable resistor. The sewing speed is achieved by detecting the rotation angle of the adjusting shaft, which does not affect the normal sewing observation and can detect the interaction volume of the presser foot without affecting sewing.

[0009] In the above-mentioned interaction volume speed limiting structure for a sewing machine head, a fastening nut is also sleeved on the input shaft. A friction gasket and a sliding gasket are also sleeved on the input shaft. The sliding gasket is arranged between the fastening nut and the mounting plate. The friction gasket is arranged between the mounting plate and the measuring seat. The fastening nut presses the mounting plate and the friction gasket against the measuring seat through the sliding gasket.

[0010] The fastening nut is sleeved with the input shaft, a sliding gasket is provided between the fastening nut and the mounting plate, a friction gasket is provided between the mounting plate and the measuring seat, and the sliding gasket, the mounting plate and the friction gasket are pressed onto the measuring seat by the fastening nut, thereby realizing the fixed connection between the measuring seat and the mounting plate, thereby fixing the measuring seat in the machine head, and the setting of the sliding gasket does not affect the rotation of the input shaft, so that when the input shaft rotates, only the fastening nut rotates with it, and the friction gasket, the mounting plate and the sliding gasket do not rotate with it, thereby improving the convenience of installing the measuring seat and ensuring the stability of the rotation of the input shaft.

[0011] In the above-mentioned interactive speed limiting structure of the sewing machine head, the mounting plate is vertically provided with a long strip-shaped clearance hole, the clearance hole allows the input shaft to pass through, and there is a clearance gap between the outer side wall of the input shaft and the hole wall of the clearance hole.

[0012] The mounting plate does not contact the input shaft when axially limited by the fastening nut, sliding gasket and friction gasket, which reduces the influence of the rotation of the input shaft on the mounting plate, and can reduce the friction between the input shaft and the input shaft while axially limiting the input shaft, making the measurement of the rotating rheostat more accurate.

[0013] In the above-mentioned interactive speed limiting structure of the sewing machine head, one end of the mounting plate protrudes to form an elastic clamping part, a clamping through hole is provided on the elastic clamping part, and a positioning pin with one end inserted into the clamping through hole is fixedly connected to the head.

[0014] By fixing a positioning pin on the machine head and inserting the positioning pin into the clamping through hole of the elastic clamping part, a quick connection between the mounting plate and the machine head is achieved, and the stability of the mounting plate installation is improved.

[0015] In the above-mentioned interactive speed limiting structure of the sewing machine head, a mounting groove is axially provided at the end of the adjusting shaft, one end of the input shaft is inserted into the mounting groove, a mounting gap is provided between the end of the input shaft and the bottom of the mounting groove, and a gap is provided between the fastening nut and the end of the adjusting shaft.

[0016] By setting the installation gap and interval, the installation of the input shaft and the adjustment shaft is more convenient, and the processing accuracy requirement is lower.

[0017] In the above-mentioned interactive speed limiting structure of the sewing machine head, a tie hole is provided at the lower end of the mounting plate for allowing a tie for bundling electric wires to pass through.

[0018] The setting of the tie hole allows a tie to be set on the mounting plate. The tie passes through the tie hole and can bundle the wires of the measuring seat to avoid interference with other components in the machine head. The stability of the installation of the rotary rheostat is improved.

[0019] Compared with the prior art, the interactive amount speed limit structure of the sewing machine head has the following advantages: By connecting an input shaft to the adjusting shaft and circumferentially fixing the input shaft to the adjusting shaft, the real-time monitoring of the presser foot interactive amount is realized through the relative rotation amount between the input shaft and the rotating rheostat seat body, and the control of the sewing speed is achieved through the processor, realizing the speed limit when the presser foot interactive amount is large, thereby improving the sewing stability of the sewing machine for sewing materials of various thicknesses. Moreover, in this application, a rotating rheostat seat body, an input shaft and a mounting plate are added to the adjusting shaft of the machine head, and the sewing speed is realized by detecting the rotation angle of the adjusting shaft, which does not affect the normal sewing observation and does not affect the sewing while realizing the detection of the presser foot interactive amount. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG. is a schematic structural view of the assembled utility model.

[0021] Figure 2 FIG. is a partial schematic structural view of the assembled utility model.

[0022] Figure 3 FIG. is a partial front view of the assembled utility model.

[0023] Figure 4 is Figure 3 the sectional view taken along A-A in FIG.

[0024] Figure 5 FIG. is a schematic structural view of the mounting plate in the utility model.

[0025] In the figure, 1, machine head; 11, positioning pin; 2, main shaft; 3, adjusting assembly; 31, adjusting knob; 32, crank; 33, adjusting shaft; 33a, mounting groove; 4, rotating rheostat; 41, input shaft; 42, mounting plate; 42a, relief hole; 42b, elastic clamping portion; 42c, clamping through hole; 42d, wire passing hole; 43, fastening nut; 44, measuring seat; 45, friction gasket; 46, sliding gasket; 5, fastener; 6, relief gap; 7, mounting gap; 8, interval. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The following are specific embodiments of the present utility model and in conjunction with the accompanying drawings, the technical solutions of the present utility model are further described, but the present utility model is not limited to these embodiments.

[0027] Such as Figure 1As shown in the figure, the interaction amount speed limit structure of the sewing machine head. The sewing machine includes a head 1 and a main shaft 2 rotatably connected within the head 1. A regulating assembly 3 is connected to the main shaft 2. The regulating assembly 3 includes a regulating knob 31 rotatably connected to the head 1, a regulating shaft 33 that can rotate and adjust the presser foot interaction amount, and a crank 32 fixedly connected to the regulating shaft 33. The upper end of the crank 32 is embedded within the regulating knob 31 and the regulating knob 31 can drive the crank 32 to swing.

[0028] Specifically, as Figure 1-5 shown, this interaction amount speed limit function structure includes a rotary variable resistor 4. The rotary variable resistor 4 includes a measuring base 44 fixed within the head 1 and an input shaft 41 rotatably connected to the measuring base 44. The input shaft 41 is fixedly installed on the regulating shaft 33. A mounting plate 42 is fixedly connected to the head 1. The mounting plate 42 is axially connected to and limits the input shaft 41. The regulating shaft 33 can drive the input shaft 41 to rotate relative to the measuring base 44.

[0029] Working principle: According to the thickness of the sewing material, the presser foot interaction amount is adjusted by rotating the regulating shaft 33. The rotation of the regulating shaft 33 drives the input shaft 41 to rotate. And a mounting plate 42 is fixedly connected to the head 1. The mounting plate 42 is axially connected to and limits the input shaft 41. When the input shaft 41 rotates, the mounting plate 42 remains stationary. The measuring base 44 is fixed within the head 1. The resistance value can be measured according to the rotation of the input shaft 41 relative to the measuring base 44. The measuring base 44 is electrically connected to an external processor. The measuring base 44 measures the resistance value and feeds it back to the external processor. The processor adjusts the sewing speed according to the fed-back resistance value. When the resistance value is larger, the speed is slower, thereby reducing the instability of sewing caused by a large presser foot interaction amount. The above structure directly connects an input shaft 41 to the regulating shaft 33 and circumferentially fixes the input shaft 41 to the regulating shaft 33. The relative rotation amount between the input shaft 41 and the measuring base 44 is used to monitor the presser foot interaction amount in real time, and the sewing speed is controlled through an external processor, achieving speed limit when the presser foot interaction amount is large, thereby improving the sewing stability of the sewing machine for sewing materials of various thicknesses. And in this application, a rotary variable resistor 4 is added to the regulating shaft 33 of the head 1, and a mounting plate 42 is provided on the head 1 to axially limit the input shaft 41 in the rotary variable resistor 4. The sewing speed is achieved by detecting the rotation angle of the regulating shaft 33, without affecting normal sewing observation, and without affecting sewing while realizing the detection of the presser foot interaction amount.

[0030] As Figure 4 and Figure 5As shown, a fastening nut 43 is also sleeved on the input shaft 41. A friction gasket 45 and a sliding gasket 46 are also sleeved on the input shaft 41. The sliding gasket 46 is arranged between the fastening nut 43 and the mounting plate 42, and the friction gasket 45 is arranged between the mounting plate 42 and the measuring seat 44. The fastening nut 43 presses the mounting plate 42 and the friction gasket 45 against the measuring seat 44 through the sliding gasket 46. The mounting plate 42 is provided with a long strip-shaped relief hole 42a in the vertical direction. The relief hole 42a allows the input shaft 41 to pass through, and there is a relief gap 6 between the outer wall of the input shaft 41 and the hole wall of the relief hole 42a.

[0031] As Figure 2 , Figure 4 and Figure 5 shown, one end of the mounting plate 42 protrudes to form an elastic clamping portion 42b. A clamping through hole 42c is provided in the elastic clamping portion 42b. A positioning pin 11 with one end inserted into the clamping through hole 42c is fixedly connected to the machine head 1.

[0032] As Figure 4 shown, an installation groove 33a is axially provided at the end of the adjusting shaft 33. One end of the input shaft 41 is inserted into the installation groove 33a. There is an installation gap 7 between the end of the input shaft 41 and the bottom of the installation groove 33a. There is a gap 8 between the fastening nut 43 and the end of the adjusting shaft 33. A tie-rod hole 42d through which a tie-rod for bundling electric wires can pass is provided at the lower end of the mounting plate 42.

[0033] The specific embodiments described herein are merely illustrative of the spirit of the present utility model. Those skilled in the art of the present utility model can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present utility model or exceed the scope defined by the appended claims.

Claims

1. A speed limiting structure for the interaction amount of a sewing machine head, the sewing machine comprising a head (1) and a main shaft (2) rotatably connected to the head (1), an adjusting component (3) being connected to the main shaft (2), the adjusting component (3) having an adjusting shaft (33) capable of rotating and adjusting the interaction amount of a presser foot, characterized in that: The interactive speed limiting functional structure comprises a rotary rheostat (4), the rotary rheostat (4) comprising a measuring seat (44) fixed in a machine head (1) and an input shaft (41) rotatably connected to the measuring seat (44), the input shaft (41) being fixedly mounted on an adjusting shaft (33), a mounting plate (42) being fixedly connected to the machine head (1), the mounting plate (42) being axially connected to the input shaft (41) and limiting the position, and the adjusting shaft (33) being able to drive the input shaft (41) to rotate relative to the measuring seat (44).

2. The interactive speed limiting structure of the sewing machine head according to claim 1, characterized in that: The input shaft (41) is also sleeved with a fastening nut (43), and the input shaft (41) is also sleeved with a friction washer (45) and a sliding washer (46). The sliding washer (46) is arranged between the fastening nut (43) and the mounting plate (42), and the friction washer (45) is arranged between the mounting plate (42) and the measuring seat (44). The fastening nut (43) presses the mounting plate (42) and the friction washer (45) onto the measuring seat (44) through the sliding washer (46).

3. The interactive speed limiting structure of the sewing machine head according to claim 1 or 2, characterized in that: The mounting plate (42) is provided with a long strip-shaped clearance hole (42a) in the vertical direction. The clearance hole (42a) allows the input shaft (41) to pass through, and a clearance gap (6) is provided between the outer side wall of the input shaft (41) and the hole wall of the clearance hole (42a).

4. The interactive speed limiting structure of the sewing machine head according to claim 1 or 2, characterized in that: One end of the mounting plate (42) is raised to form an elastic clamping portion (42b), and a clamping through hole (42c) is provided on the elastic clamping portion (42b). A positioning pin (11) with one end inserted into the clamping through hole (42c) is fixedly connected to the machine head (1).

5. The interactive speed limiting structure of the sewing machine head according to claim 2, characterized in that: The end of the adjusting shaft (33) is provided with a mounting groove (33a) along the axial direction, one end of the input shaft (41) is inserted into the mounting groove (33a), a mounting gap (7) is provided between the end of the input shaft (41) and the bottom of the mounting groove (33a), and a gap (8) is provided between the fastening nut (43) and the end of the adjusting shaft (33).

6. The interactive speed limiting structure of the sewing machine head according to claim 2, characterized in that: The lower end of the mounting plate (42) is provided with a tie hole (42d) through which a tie for bundling electric wires can pass.

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