Sewing machine with high machine head lifting precision

Abstract

The utility model discloses a sewing machine with a machine head high in lifting precision, and belongs to the technical field of sewing machines. Through the coupling arranged on the upper shaft and the matching of the V-shaped opening processed on the coupling, the repeated positioning is accurate in the lifting process of the lifting machine head, and the deformation of the upper shaft during needle puncture is reduced; the upper feeding shaft sliding block groove and the feeding crank are high in matching precision, the lifting machine head can transmit torque at high precision at any time during lifting, position deviation is avoided, and feeding stability is guaranteed; the end portion of the lower shaft transmits torque through the bevel gear, transmission rigidity is improved, service life is prolonged, maintenance man-hours frequently increased due to breakage of the synchronous belt are reduced, and machine stability is improved.

Description

TECHNICAL FIELD

[0001] The utility model provides a sewing machine with high precision of machine head lifting belongs to sewing machine technical field. BACKGROUND

[0002] The sewing machine is a kind of mechanical equipment for connecting cloth or other materials by needle thread, greatly improves sewing efficiency and precision, and makes thread pass through material to form firm joint by needle and bobbin core cooperation.

[0003] At present, many sewing machines for box type articles on the market, because the distance between presser foot and needle plate is small, so the machine head lifting machine appears on the market, the machine head lifting part is linked by coupling, and the shuttle transmission is driven by synchronous belt, and the high-precision torque transmission required by machine head lifting is needed, and the market feedback is that the positioning accuracy of coupling is poor, synchronous belt is easy to break and transmission accuracy is poor. UTILITY MODEL CONTENTS

[0004] The utility model solves the technical problems that the positioning accuracy of coupling is poor, synchronous belt is easy to break and transmission accuracy is poor for the sewing machine on the market.

[0005] In order to solve the above problems, the utility model provides a sewing machine with high precision of machine head lifting, which comprises a machine frame; the high seat outside the machine frame is provided with a power wheel, the power wheel is connected with an upper shaft, a coupling, a needle bar crank and a thread lifting lever, the high seat inside is provided with a large fork connected with the upper shaft and a large connecting rod, the large connecting rod transmits reciprocating motion to a swing shaft, the swing shaft drives a lower shaft, the lower shaft changes transmission position through two groups of bevel gears and a short shaft, the tail of the bevel gear is provided with a shuttle, the large fork drives the lower feeding shaft and feeding crank to rotate, the feeding crank drives the feeding tooth to cooperate with the presser foot through the small fork matched with the sliding block, and the machine body inside the machine frame is provided with an upper feeding shaft; the upper feeding shaft transmits the swing of upper feeding to the needle bar frame through the sliding block groove and feeding crank, and drives the small presser foot to feed.

[0006] As an improvement, the machine frame comprises a bottom plate, a variable diameter adapter arranged on one side of the bottom plate and a high seat arranged above the other side, a stand arranged on one side and above the variable diameter adapter, a machine body arranged on the upper end of the high seat and located on one side of the bottom plate, a lifting machine head and a cylinder;

[0007] As an improvement, the upper shaft, the coupling and the needle bar crank are arranged in the machine body of the machine frame;

[0008] As an improvement, the thread lifting lever passes through the machine body on one side;

[0009] As an improvement, the lower shaft and the lower feeding shaft are arranged in the bottom plate and the variable diameter adapter;

[0010] As an improvement, the feeding crank is arranged at the end of the lower feeding shaft and outside the column.

[0011] The utility model discloses the beneficial effect that:

[0012] The shaft coupling is installed on the upper shaft, and the V-shaped port on the shaft coupling is matched to make the repeated positioning accurate during the lifting process of the lifter head, and the deformation of the upper shaft during needle puncture is reduced.

[0013] The feeding crank and the upper feeding shaft sliding block groove have high matching precision, the lifter head can transfer the torque with high precision at any time during lifting, no position deviation is generated, and feeding stability is ensured.

[0014] The lower shaft end transmits the torque through the bevel gear, the rigidity and service life of transmission are improved, the maintenance man-hours are increased due to the frequent rupture of the synchronous belt, and the machine stability is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The utility model discloses a sewing machine with high lifter head lifting precision Figure One .

[0016] Figure 2 The utility model discloses a sewing machine with high lifter head lifting precision Figure Two .

[0017] Figure 3 The utility model discloses a sewing machine with high lifter head lifting precision.

[0018] Figure 4 The utility model discloses a sewing machine with high lifter head lifting precision.

[0019] Figure 5 The utility model discloses a sewing machine with high lifter head lifting precision.

[0020] Figure 6 The utility model discloses a sewing machine with high lifter head lifting precision.

[0021] Figure 7 The utility model discloses a sewing machine with high lifter head lifting precision.

[0022] Figure 8 The utility model discloses a sewing machine with high lifter head lifting precision. Figure One .

[0023] Figure 9 The utility model discloses a sewing machine with high lifter head lifting precision. Figure Two .

[0024] Figure 10The utility model discloses a sewing machine with high precision of machine head lifting Figure Three .

[0025] Figure 11 The utility model discloses a sewing machine with high precision of machine head lifting Figure Four .

[0026] 1, power wheel; 2, height seat; 3, bottom plate; 4, variable diameter adapter; 6, small jaw fork; 7, stand; 9, lifting machine head; 10, air cylinder; 15, machine body; 20, big jaw fork; 21, big connecting rod; 22, swing axle; 23, lower shaft; 24, lower feeding shaft; 25, short shaft; 26, bevel gear; 28, upper shaft; 29, coupling; 30, needle bar crank; 31, thread tension lever; 32, sliding block groove; 33, feeding crank; 34, upper feeding shaft. DETAILED DESCRIPTION

[0027] The utility model is further explained in connection with the drawings.

[0028] According to Figure 1 -11 shows: the utility model provides a kind of sewing machine with high precision of machine head lifting: including machine frame;Machine frame includes bottom plate 3, variable diameter adapter 4 being arranged at the one side of bottom plate 3 and the high seat 2 of another side top, the stand 7 being arranged at the one side and top of variable diameter adapter 4, the machine body 15 of being arranged at the upper end of high seat 2 and being located at the one side of bottom plate 3, lifting machine head 9, air cylinder 10;This is the frame structure of sewing machine;

[0029] The high seat 2 outside of machine frame is equipped with power wheel 1, and power wheel 1 is connected with upper shaft 28, coupling 29, needle bar crank 30 and thread tension lever 31;Upper shaft 28, coupling 29, needle bar crank 30 are rotatably arranged in the machine body 15 of machine frame;Thread tension lever 31 side passes through machine body 15;This constitutes the running system of upper portion of sewing machine;

[0030] High seat 2 is equipped with big jaw fork 20 and big connecting rod 21 being connected with upper shaft 28, and big connecting rod 21 transmits reciprocating motion to swing axle 22, and swing axle 22 drives lower shaft 23, and lower shaft 23 changes transmission position by two groups of bevel gear 26 and short shaft 25, and the tail of bevel gear 26 is equipped with shuttle, so as to drive shuttle running, and cooperate with the synchronous operation of upper shaft 28 to realize the purpose of continuous thread hooking and thread releasing;

[0031] The lower feeding shaft 24 drives the feeding crank 33 to rotate, and the feeding crank 33 drives the feeding teeth to cooperate with the presser foot to feed through the cooperation of the slide block and the small fork 6; the upper feeding shaft 34 is arranged in the machine body 15 of the machine frame; the upper feeding shaft 34 transmits the swing of the upper feeding to the needle bar frame through the slide block groove 32 and the feeding crank 33, and drives the small presser foot to feed; the lower shaft 23 and the lower feeding shaft 24 are arranged in the bottom plate 3 and the variable-diameter sleeve 4; the feeding crank 33 is arranged at the end of the lower feeding shaft 24 and located outside the upright column 7.

[0032] The principle of the utility model is as follows: when the device is running, the coupling 29 arranged on the upper shaft 28 is matched with the V-shaped port on the coupling 29, so that the elevator head 9 is accurately positioned during the lifting process, and the deformation of the upper shaft 28 during needle puncture is reduced; the feeding crank 33 and the slide block groove 32 of the upper feeding shaft 34 have high matching precision, the elevator head 9 can transmit torque with high precision at any time during the lifting process, no position deviation is generated, and the feeding stability is ensured; the lower shaft 23 transmits torque through the bevel gear 26 at the end, the rigidity and service life of transmission are improved, the maintenance man-hours are increased due to frequent synchronous belt breakage, and the machine stability is improved.

[0033] The above describes the utility model and its implementation mode, which is not limited, and the drawings only show one of the implementation modes of the utility model, and the actual structure is not limited thereto. In summary, if a person skilled in the art is inspired, without departing from the creative purpose of the utility model, similar structural modes and embodiments are not creatively designed, which should belong to the protection scope of the utility model.

Claims

1. A sewing machine with high precision of head lifting, comprising a machine frame; characterized in that: The power wheel (1) is provided outside the high seat (2) of the machine frame, and is connected with the upper shaft (28), the shaft coupling (29), the needle bar crank (30) and the thread tension lever (31). The large fork (20) and the large connecting rod (21) connected with the upper shaft (28) are arranged in the high seat (2). The large connecting rod (21) transmits reciprocating motion to the swing shaft (22). The swing shaft (22) drives the lower shaft (23). The lower shaft (23) changes the transmission position through two groups of bevel gears (26) and short shafts (25). The tail of the bevel gear (26) is provided with a shuttle. The large fork (20) drives the lower feeding shaft (24) and the feeding crank (33) to rotate. The feeding crank (33) drives the feeding tooth to cooperate with the presser foot through the small fork (6) matched with the sliding block. The machine body (15) of the machine frame is provided with the upper feeding shaft (34). The upper feeding shaft (34) transmits the swing of the upper feeding to the needle bar frame through the sliding block groove (32) and the feeding crank (33), and drives the small presser foot feeding.

2. The sewing machine of claim 1, wherein: The machine frame comprises a bottom plate (3), a variable diameter sleeve (4) arranged on one side of the bottom plate (3) and a high seat (2) arranged above the other side, a stand (7) arranged on one side and above the variable diameter sleeve (4), a machine body (15) arranged at the upper end of the high seat (2) and located on one side of the bottom plate (3), a lifting head (9) and an air cylinder (10).

3. The sewing machine of claim 2, wherein: The upper shaft (28), the shaft coupling (29) and the needle bar crank (30) are rotatably arranged in the machine body (15) of the machine frame.

4. The sewing machine of claim 2, wherein: The thread tension lever (31) passes through the machine body (15) on one side.

5. The sewing machine of claim 1, wherein: The lower shaft (23) and the lower feeding shaft (24) are arranged in the bottom plate (3) and the variable diameter sleeve (4).

6. The sewing machine of claim 1, wherein: The feeding crank (33) is arranged at the end of the lower feeding shaft (24) and located outside the stand (7).

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