JPH0424063A - Cloth feeding degree regulator for sewing machine - Google Patents

Abstract

PURPOSE:To enable a cloth feeding degree to be kept to a regulated degree without any load bearing at a driving source by driving a feed regulating screw with the driving source via a worm and a worm wheel. CONSTITUTION:By a cloth feeding mechanism, a cloth piece is fed in the specified direction. Besides, with movement in the axial direction along with the rotational movement of a feed regulating screw 72 fitted rotatably on a sewing machine arm, the feed degree of said cloth feeding mechanism is regulated. On the rotary shaft 80a of a stepping motor 80 for rotating the feed regulating screw 72, a worm 78 is fitted. A worm wheel 76 to be fitted on the worm 78 is fitted on the feed regulating screw 72. In other words, even if the screw 72 is forced to be rotationally moved at the time of the stopping of the motor 80, the movement is suppressed with the worm and the worm wheel and the screw can be kept at a regulated position. Accordingly, even if the motor 80 is still, a cloth feeding degree can be kept constant.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention (Uta) relates to a cloth feed amount adjusting device for a sewing machine, and specifically relates to a cloth feed amount adjusting device for a sewing machine, and specifically a cloth feed mechanism that feeds cloth in a predetermined direction, and a cloth feed amount adjustment device that moves the cloth in an axial direction. The present invention relates to a cloth feed amount adjusting device for a sewing machine, which includes a feed adjustment screw for adjusting the feed amount.

[Prior Art] Conventionally, sewing machines have been equipped with a cloth feed mechanism that feeds the work cloth to the sewing position. When the work cloth is fed through the cloth feed mechanism 1, the sewing needle moves up and down and the hook rotates. Then, a seam is formed in the work cloth.

In this type of sewing machine, the feed amount of the cloth feed mechanism is determined by the feed pitch of the horizontal feed shaft, which moves the feed dog one step in the horizontal direction. It can be adjusted by changing the swing angle of the cloth feed adjuster. And the swing angle is
It is determined by the amount of movement of the feed adjustment screw that comes into contact with the V-shaped swinging part of the cloth feed adjuster, and by turning the dial (feed scale plate set) directly connected to this feed adjustment screw, the rotation angle corresponds to the amount of cloth feed. By matching, the cloth feed amount can be set to a desired amount.

Incidentally, in recent years, automation of sewing machines has progressed, and devices have been developed that automatically adjust the amount of cloth feed to a set amount using an electromagnetic solenoid. For example, the swing angle of the feed adjuster is detected by a detector, and the link mechanism is activated by an electromagnetic solenoid according to the detected swing angle and the target angle (preset according to the cloth feed amount). A device has been proposed that changes the feed pitch of the horizontal feed shaft and adjusts the cloth feed amount to a set amount by pulling the cloth.

[Problem to be Solved by the Invention] However, in order to maintain the previously set cloth feed amount with the cloth feed amount adjusting device described above, it is difficult to keep the link mechanism at a constant inclination angle by constantly energizing the electromagnetic solenoid. This causes problems such as increased power consumption and overheating of the electromagnetic solenoid.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a cloth feed adjustment device for a sewing machine that can maintain the cloth feed amount at an adjusted amount without imposing a load on the drive source.

[Means for Solving the Problems] The gist of the present invention is to provide a fabric feeding mechanism that feeds fabric in a predetermined direction, and a fabric feeding mechanism that is rotatably attached to a sewing machine arm and moves in the axial direction as the sewing machine arm rotates. A cloth feed amount adjustment device for a sewing machine that is equipped with a feed adjustment screw that adjusts the feed amount of the mechanism includes a drive source for rotating the feed adjustment screw, a worm attached to a rotating shaft of the drive source, and a feed adjustment screw. A feed amount adjusting device for a sewing machine is characterized by comprising a worm wheel that is attached to a worm wheel and meshes with a worm.

[Function] With the cloth feed amount adjusting device of the present invention configured as described above, [1] When the worm is driven by the driving source and rotates, the rotation is transmitted to the worm wheel, and the amount adjusting screw is rotated. . The adjusting screw moves in the axial direction according to rotation 1 to adjust the feed amount of the cloth feeding mechanism. On the other hand, when the drive source is stopped (even if the amount adjustment screw tries to turn in either the forward or reverse direction, the worm wheel is blocked by the worm, so the adjustment screw cannot turn at all. .

Therefore, the adjusting screw is held at the adjusted position, and the feed amount of the cloth feeding mechanism is also maintained at the adjusted amount.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

Figure 1 is a perspective view of the cloth feed amount adjusting device of the embodiment, Figure 2 (
A) is a front view of the sewing machine with a built-in cloth feed amount adjustment device, FIG. 2(B) is a bottom view of the sewing machine, and FIG. 2(C) is a sectional view taken along line X-X in FIG. 1(A). .

First, as shown in FIG. 2, in the sewing machine, a needle bar mechanism 5 is provided at the leading end 3a of the arm 3, and an AC motor 7 is provided at the rear end 3b of the arm 3. A cloth feed mechanism 9 is disposed on the lower surface 5a of the bed portion 5 (around the needle drop position, and the attachment of the arm portion 3 from the cloth feed mechanism 9 extends from the root portion 3C to the horizontal feed axis] 1 and the vertical feed axis) 3 are arranged in parallel.Furthermore, a cloth feed amount adjustment device 15 for adjusting the feed amount of the cloth feed mechanism 9 is provided at the vertical portion 3d of the arm portion 3.

The needle bar mechanism 5 moves up and down while being supported by a thread take-up crank 20 that converts the rotation of the upper shaft 7, which is directly connected to the AC motor 7, into vertical movement, and a needle bar link assembly 22. It is composed of well-known combination parts such as a needle bar 24 and a sewing needle 26.

A cylindrical sleeve 30 with a large number of grooves 30a is formed on the outer periphery of the AC motor 7. This protects the inside of the AC motor 7 and promotes heat radiation. Also, the drive shaft 7a of the AC motor 7
The upper shaft 17 is connected to the upper shaft 17 via a coupling 32, and a timing pulley 34 is fitted along with the coupling 32.

A timing belt 36 is connected from this timing pulley 34 to a timing pulley 44 fitted on the vertical feed shaft] 3.
The rotation of the drive shaft 7a is transmitted to the vertical feed shaft 13.

Cloth feed mechanism 9 (see table) Consists of a combination of a feed table 40 attached near the tip of the horizontal feed shaft 11 and a vertical feed arm 42 rotatably attached near the tip of the vertical feed 13 axis. A feed dog 40a attached to the top surface of the feed table 40 is moved back and forth to feed the work cloth (path shown) toward the needle drop position.

A timing pulley 44 is fitted to the rear end of the vertical feed shaft 3. The timing pulley 44 is rotationally driven by the AC motor 7 via the timing belt 36. Therefore,
The vertical feed shaft 13 rotates in synchronization with the upper shaft ]7. In addition, a vertical eccentric wheel 48 is fitted to the vertical feed shaft] 3 (the upper bearing is lined up with a metal 46, and a vertical eccentric wheel 48 is fitted with a vertical feed arm 42).
The base 42a is connected to a tongue-and-groove upper and lower eccentric wheel 48, which is configured so that the upper and lower feed arms 42 move in an arc upward and downward as the upper and lower eccentric wheels 48 rotate.

Further, a horizontal eccentric wheel 50 disposed near the timing pulley 44 is fitted onto the vertical feed shaft 3. The horizontal eccentric wheel 50 includes a horizontal feed link 54a and a horizontal feed link set 5.
4b, the horizontal feed shaft 1 is
When the horizontal eccentric wheel 50 rotates, the horizontal feed arm 56 (two connecting tongues, the horizontal feed shaft 1) fitted in the horizontal feed shaft 1 is configured to move back and forth in the width direction of the bed portion 5. The horizontal feed arm 56 is connected to the horizontal feed link set 54b, and is connected to the feed adjustment device 1 via a switch (not shown), a reverse stitching lever shaft 58, and a link mechanism 60.
The tongue and groove horizontal feed shaft connected to the feed adjuster 70 of No. 5] is configured such that the forward and backward movement pitch of No. 1 can be adjusted.

The above-mentioned longitudinal movement of the horizontal feed shaft 11 (2)
0 moves back and forth, and the vertical arc movement of the vertical feed arm 42 is transmitted to the feed table 40 by the bifurcated portion 42b of the vertical feed arm 42 that engages with the engagement end 40b of the feed table 40. 40a performs four movements of raising, moving forward, moving downward, and moving backward to feed the work cloth in the direction of the needle drop position. Therefore,
The cloth feed amount of the cloth feed mechanism 9 is determined by the pitch of the back and forth movement of the horizontal feed shaft, and the pitch is adjusted by the feed adjuster 70 of the feed amount adjustment device]5.

Also, a lower shaft gear 62 is fitted to the vertical feed shaft 13. This engages with the hook shaft gear 66 of the hook shaft 64, and the vertical feed shaft 1
3 is transmitted to the hook shaft 64 to rotate the hook (not shown).

As shown in FIG. 1, the feed amount adjusting device] 5 is configured to adjust the feed through a cloth feed amount adjuster 70, a feed adjustment screw 72 for adjusting the swing angle of the cloth feed amount adjuster 70, and a joint 74. A worm wheel 76 connected to the screw 72, a worm 78 meshing with the worm wheel 76, and a worm 78.
The main parts include a stepping motor 80 that rotationally drives the cloth feeding amount regulator 70, and a potentiometer 82 that detects the swing angle of the cloth feed amount regulator 70.

Cloth feed amount adjuster 70 [L Adjusts the pitch of the back-and-forth movement of the horizontal feed shaft 11, that is, the cloth feed amount, according to its swing angle, and the feed adjustment screw 72 contacts the V-shaped notch 70a. The swing angle is determined by the following. In other words, when the feed adjustment screw 72 moves forward in its axial direction (towards the back of the notch 70a), the swing angle becomes smaller and the amount of fabric feed decreases, and when it moves backward, the swing angle increases and the amount of fabric feed is reduced. It is structured so that the number increases.

As shown in FIG. 3, the stepping motor 80 is housed in a case 84 attached to the vertical portion 3d of the arm portion 3.
The drive shaft 80a is housed so as to be orthogonal to the feed adjustment screw 72, and its rotation is controlled by a control device (not shown).

The potentiometer 82 is disposed below the stepping motor 80, and when the swing angle of the cloth feed amount regulator 70 is transmitted via the link mechanism 86, a voltage corresponding to the swing angle is applied to the control device. to have high strength. Further, the case 84 is attached to the side of the vertical portion 3d opposite to the wall surface on the side where the sewing machine is operated, and is arranged so as not to interfere with the operation.

The stepping motor 80 is driven by a command pulse from the control device, and is controlled by the control device so that the swing angle detected by the potentiometer 82 becomes a target angle corresponding to a preset cloth feed amount. Its rotation is controlled.

Note that the configuration of the control device and the rotation control of the stepping motor by the control device are well known, so detailed descriptions thereof will be omitted.

In the above sewing machine], when the AC motor 7 rotates and each axis [13.17] is driven, the feed dog 40a of the cloth feed mechanism 9 performs the four movements described above, and the The fabric to be processed is sequentially fed to the needle drop position using the fabric feed amount set. At the same time, the sewing needle 26 moves up and down, the hook rotates, and stitches are formed on the fed work cloth. At this time,
Even if the vibrations of the AC motor 7 and each mechanism are transmitted to the feed adjustment device] 5 and act to rotate the feed adjustment screw 72, the worm wheel 76 and the worm 78 fix the feed adjustment screw 72 at the adjustment position and prevent rotation. Since the sewing machine does not move, sewing is performed at a constant feed amount.

As explained above, according to this embodiment, the stepping motor 80 moves the worm 76 and the worm wheel 7.
Since the cloth feed adjustment screw 72 is turned through the stepper motor 80, when the stepping motor 80 is stopped,
Even if the vibration accompanying the operation of the sewing machine acts as a force to turn the feed adjustment screw 72, the worm wheel 76 and the worm 7
Since rotation of the cloth feed adjustment screw 72 is mechanically prevented by 8, the cloth feed adjustment screw 72 does not rotate. Therefore, the cloth feed amount of the cloth feed mechanism 9 is kept at an adjustable amount, and stitches are accurately formed at the same pitch.

Therefore, after adjusting the cloth feed amount, the stepping motor 8
Since the energization of 0 can be stopped, power consumption can be suppressed and the stepping motor 80 will not overheat. In conventional devices using electromagnetic solenoids, electricity must be constantly turned on to maintain the amount of cloth feed at the adjusted amount, resulting in problems such as increased power consumption and overheating.
This does not occur at all in this embodiment.

Further, since the rotation angle of the stepping motor 80 is controlled based on the detected angle and the target angle by detecting the swing angle using the potentiometer 82, fine adjustments can be made and the amount of cloth feed can be adjusted accurately. can.

[Effects of the Invention] As detailed above, according to the present invention, the feed adjustment screw has the following features:
Since it is driven by the drive source via the worm and worm wheel, even if the air feed adjustment screw tries to rotate when the drive source is stopped, it is blocked by the worm and worm wheel and kept at the adjusted position. . Therefore, even if the drive source is stopped, the amount of cloth feed can be kept constant.

Further, unlike the conventional method, there is no need for the drive source to continue operating in order to keep the feed adjustment screw stationary even after adjusting the amount of cloth feed, so energy consumption can be reduced.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the fabric feed adjustment device of the embodiment, Figure 2 (A
) is a front view of the sewing machine, Figure 2 (B) is a bottom view of the same, Figure 2 (C) is a sectional view taken along the line X-X in Figure 1, and Figure 3 is a partial front view of the fabric feed amount adjustment device. be. ]... Sewing machine 3... Arm part 5... Bed part 9... Cloth feed mechanism 15... Feed amount adjustment device 70... Cloth feed adjuster 72... Cloth feed adjustment screw 76...・Worm wheel 78...worm 80・
... Stepping motor 82 ... Potentiometer

Claims (1)

[Scope of Claims] A cloth feeding mechanism that feeds fabric in a predetermined direction, and a feed adjustment screw that is rotatably attached to a sewing machine arm and adjusts the amount of feed of the cloth feeding mechanism by moving in the axial direction as the sewing machine arm rotates. ,
A cloth feed amount adjustment device for a sewing machine equipped with a drive source for rotating the feed adjustment screw, a worm attached to the rotating shaft of the drive source, and a worm attached to the feed adjustment screw and meshing with the worm. A cloth feed amount adjustment device for a sewing machine, characterized by comprising a worm wheel and the following.