JPH0517028Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to an upper feed device of a sewing machine, and in particular, the spring force of the first spring that biases a presser foot bar equipped with a cloth presser foot downward, and the upper feed dog. The present invention relates to an improvement in an upper feed device for a sewing machine, in which the spring force of a second spring that biases the feed dog presser bar engaged with the feed dog presser bar downward can be adjusted individually.

(Prior Art) Conventionally, as a top feed device of this type of sewing machine, there is one described in, for example, Japanese Utility Model Publication No. 1336/1983.

In this case, by screwing the adjusting screw 5 forward and backward, the spring force of the first elastic body 17 that biases the first presser bar 7 having the cloth presser foot 21 in one direction can be increased or decreased, and the knob 16 is pushed down against the spring force of the third elastic body 19, and the protrusion 15 at the lower end of the adjustment shaft 14 is engaged with the groove 8 of the movable body 10, and the knob 16 is moved in a predetermined direction. By rotating the movable body 10 and screwing it back, the second presser bar 11 is urged downwardly against the feed dog 31.
The spring force of the elastic body 18 is increased or decreased.

(Problem to be Solved by the Invention) By the way, when increasing or decreasing the spring force of the second elastic body 18 that urges the second presser bar 11 downward, the knob 16 is the protrusion 1 at the lower end of the adjustment shaft 14.
5 in the groove 8 of the movable body 10, and rotating the knob 16 while maintaining this state is cumbersome. Furthermore, when the fingertip is removed from the knob 16 during the rotation operation, the knob 16 is pushed upward by the spring force of the third elastic body 19, and the protrusion 15 of the adjustment shaft 14 is removed from the groove 8 of the movable body 10. It comes off. Therefore, the knob 16 is moved again to the third elastic body 19.
While pushing down against the spring force of
4 must be engaged with the groove 8 of the movable body 10. For this reason, when the spring force of the second elastic body 18 is changed significantly, there are problems such as requiring a lot of effort to adjust the spring force.

(Means for solving the problem) In this invention, an upper feed device for a sewing machine includes a cylindrical presser bar with a presser foot, which is inserted into the lower part of a sewing machine frame so as to be able to move up and down, a first adjustment body which is screwed into the upper part of the sewing machine frame so as to be able to move up and down and which has an operation knob on its upper outer periphery, a first spring which is disposed between the presser bar and the first adjustment body and which urges the presser bar downward, a feed dog presser bar which is inserted into the lower part of a central hole of the presser bar so as to be able to move up and down so as to engage with an upper feed dog which is operated for feeding the cloth by a feed mechanism, a second adjustment body which is screwed into the central hole of the presser bar above the feed dog presser bar so as to be able to move up and down, and a second spring which is disposed between the feed dog presser bar and the second adjustment body and which urges the feed dog presser bar downward,
A rotary body for moving the second adjustment body in the vertical direction is attached to a protruding portion protruding on the same center line as the adjustment body so as to be rotatable via a rotor but immovable in the vertical direction, and a connecting shaft is provided in a downward direction at the center of the lower surface of the rotary body, and is inserted into an engagement hole of an upper opening formed in the center of the second adjustment body, and the connecting shaft is engaged with the engagement hole so as to be capable of transmitting torque at all times by engaging a square shaft with a square hole.
The up and down movement of the elastic body is set by the allowable shaft length and hole depth, and the rotor is rotatably inserted around the protrusion that protrudes from the upper end surface of the operating knob, and is immovably disposed between the operating knob and a retaining ring fixed to the outer periphery of the tip of the protrusion, and the rotating body is secured to the outer periphery of the rotor by a set screw.

(Function) In the upper feed device of the sewing machine configured as described above, the first
When increasing or decreasing the spring force of the spring, by rotating the operating knob of the first adjusting body in a predetermined direction, the first adjusting body is screwed upward or downward, thereby causing the first spring to increase or decrease. The spring force of is increased or decreased.

Furthermore, when adjusting the spring force of the second spring that biases the feed dog presser bar downward, the rotating body can be rotated in a predetermined direction at a fixed position without pushing down. The torque of the moving body is transmitted to the second adjustment body via the connecting shaft and the engagement hole, and the second adjustment body is screwed forward or backward in the vertical direction,
This increases or decreases the spring force of the second spring.

Further, the rotating body is easily assembled by being fixed with a set screw to the outer periphery of a rotor which is rotatably provided on the protrusion of the operating knob but not movable in the vertical direction.

(Example) An example of this invention will be described below with reference to the drawings.

In FIG. 1, which shows the upper feed device of the sewing machine from the side, and FIG. A cloth presser rod 4 having a shape is fitted so as to be movable up and down. Presser foot 4
An upper feed base 5 is fixed to the outer periphery of the lower end of the sewing machine, and a fabric presser foot 6 for pressing the fabric on the upper surface of the throat plate of the sewing machine bed 3 is attached to the lower part of the upper feed base 5. Further, a support roller 8 is attached to the lower part of the support piece 5a extending downward at the rear of the upper feed table 5 by means of a pin 7.
is rotatably attached.

A mounting base 10 on which the upper feed dog 9 is attached at its front end is formed with a longitudinal sliding groove 11 that slidably fits into the support roller 8 of the upper feed base 5. The mounting base 10 is supported by the upper feed base 5 in a state where its sliding groove 11 is fitted with the support roller 8. Upper feed dog 9 of the mounting base 10
As is well known, the horizontal feed mechanism 12 and the vertical feed mechanism 13 cause four upward movements. That is, the drive shaft 1 of the horizontal feed mechanism 12
4 in the forward and reverse directions within a predetermined angle range, the swing arm 15 for horizontal feed swings about the shaft 16, and the mounting base 10 of the upper feed dog 9 is rotated via the interlocking link 17. Support roller 8 and sliding groove 1
It is moved back and forth by the guiding action with 1. Further, by rotating the drive shaft 18 of the vertical feed mechanism 13 forward and backward within a predetermined angle range, the swing arm 19 for vertical feed swings about the shaft 20, and the interlocking link 21 and the interlocking lever 22 are rotated. Through this, the mounting base 10 of the upper feed dog 9 can be moved up and down using the support roller 8 as a fulcrum.

Sewing machine frame 1 facing above the presser foot 4
A first adjustment body 23 formed in a cylindrical shape is provided on the upper part of the
However, there is a male threaded portion 23 formed on the outer periphery of the approximately lower half thereof.
A is screwed together so that it can move forward and backward in the vertical direction. A large diameter operation knob 24 is integrally formed on the upper outer periphery of the first adjustment body 23 .

Between the first adjusting body 23 and the presser foot bar 4,
A first spring 25 made of a compression coil spring that urges the presser rod 4 downward is supported and extendably interposed on the outer periphery of a second adjusting body 28, which will be described later.

A short feed dog presser rod 26 is fitted into the lower part of the center hole of the cloth presser rod 4 so as to be movable up and down, and the lower end of the feed dog presser rod 26 is in contact with the front upper surface of the mounting base 10. A presser ball 27, which is engaged with the presser ball 27, is rotatably fitted.

At the upper part of the center hole of the presser foot rod 4, a second adjusting body 28 is provided with a male threaded part 28 formed on the outer periphery of the lower part thereof.
A is screwed together so that it can move forward and backward in the vertical direction. The upper end of this second adjusting body 28
It extends to approximately the middle position of the center hole of the adjustment body 23. Further, in the center hole of the cloth presser rod 4, a second spring 29 made of a compression coil spring is provided between the second adjuster 28 and the feed dog presser rod 26 and biases the feed dog presser rod 26 downward. is interposed.

A rotating body 30 for moving the second adjustment body 28 forward and backward in the vertical direction is provided on the outer periphery of a protrusion that projects from the upper end surface of the operation knob 24 of the first adjustment body 23 on the same center line as the first adjustment body 23. It is arranged to be rotatable via a rotor 32 but immovable in the vertical direction.

That is, the rotor 32 is rotatably fitted around the protrusion of the operation knob 24, and the retaining ring 3 is fixed to the outer periphery of the tip of the protrusion.
A rotor 32 is mounted between the rotor 1 and the operation knob 24 so as to be rotatable but not movable in the vertical direction. The circular cap-shaped rotating body 30 is fixed to the outer periphery of the rotor 32 with a set screw 33. A boss portion 34 that is rotatably fitted into the upper part of the center hole of the first adjusting body 23 is protruded from the center of the lower surface of the rotating body 30.
4, a vertical connection shaft 35 is fitted in the upper part of the shaft 35 so as to be prevented from rotating and being prevented from coming off. The lower part of the connecting shaft 35 is connected to the second adjusting body 2
8 is fitted into an upper opening engagement hole 36 formed in the center of the holder 8. And, as shown in Figure 3,
The connecting shaft 35 and the engagement hole 36 are fitted with a square shaft such as a square or hexagonal shaft or a square hole so that torque can be transmitted at all times. The length and hole depth are set.

In addition, in this embodiment, as shown in FIG. 4, on the front surface of the sewing machine frame 1, there is a first adjustment dial 37 for adjusting the top feed amount, and a first adjustment dial 37 for adjusting the top feed amount in shirring stitches, etc. A second adjustment dial 38 and a third adjustment dial 39 for adjusting the downward feed amount are respectively provided. especially,
The first adjustment dial 37 is connected to other dials 38,
It is formed to have a diameter approximately twice as large as that of No. 39, and has an enlarged scale on its periphery so that the upward feed amount can be easily and accurately adjusted.

In this embodiment configured as described above, first, when adjusting the spring force of the first spring 25 that biases the presser foot bar 4 downward, the operation knob 24 of the first adjustment body 23 is turned to a predetermined position. When the first adjusting body 23 is rotated in this direction, the first adjusting body 23 is screwed forward or backward in the vertical direction. Then, as the first adjusting body 23 is screwed downward, the first spring 25 is compressed and its spring force is increased. Conversely, by screwing the first adjustment body 23 upward, the first spring 25
is stretched and its spring force is reduced.

Next, when adjusting the spring force of the second spring 29 that urges the feed dog presser bar 26 downward, the rotating body 30 is rotated in a predetermined direction. Then, the torque of this rotating body 30 is applied to the connecting shaft 35 and the engagement hole 36.
is transmitted to the second adjustment body 28 via
The adjustment body 28 is screwed forward or backward in the vertical direction. Then, as the second adjustment body 28 is screwed downward, the second spring 29 is compressed and its spring force is increased. Conversely, when the second adjustment body 28 is screwed back upward, the second spring 29 is expanded and its spring force is reduced.

That is, when increasing or decreasing the spring force of the second spring 29, the second spring 29 can be adjusted by rotating the rotating body 30 at a fixed position without pushing it downward.
The spring force can be easily increased or decreased.

(Effects of the invention) As described above, according to this invention, when increasing or decreasing the spring force of the second spring that biases the feed dog presser bar downward, the rotating body can be adjusted without pushing down. It rotates in a specific direction at a fixed position.
The second adjusting body can be screwed forward and backward in the vertical direction by an extremely simple operation.

As a result, the spring force of the second spring can be easily and quickly adjusted to increase or decrease, which is particularly effective when it is necessary to significantly change the spring force of the second spring.

Furthermore, by fixing the rotating body to the outer periphery of the rotor provided on the protruding part of the operation knob with a set screw, the rotating body can be rotated with respect to the protruding part, but cannot be moved in the vertical direction. Can be easily assembled.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention.
FIG. 2 is a front sectional view showing the upper feed device of the sewing machine, FIG. 3 is a horizontal sectional view taken along line 1 of FIG. 1, and FIG. 4 is a front view showing the entire sewing machine. 1... sewing machine frame, 4... presser bar, 6... presser foot, 9... upper feed dog, 23... first adjustment body, 2
4: operation knob, 25: first spring, 26: feed dog presser bar, 28: second adjustment body, 29: second
Spring, 30...rotating body, 35...connecting shaft, 36...
...Engagement hole.

Claims (1)

[Claims for Utility Model Registration] A cylindrical shaft-shaped presser foot 4 which is fitted into the lower part of the sewing machine frame 1 so as to be movable up and down and is equipped with a presser foot 6; a first adjusting body 23 that can be screwed together and has an operation knob 24 on the outer periphery of the upper part; and a first adjusting body 23 that is disposed between the presser foot bar 4 and the first adjuster body 23 and urges the presser foot bar 4 downward. the first spring 25 that feeds the cloth, and the upper feed dog 9 that feeds the cloth by the feed mechanism.
a feed dog presser rod 26 that is movably inserted into the lower part of the center hole of the cloth presser rod 4 so as to engage with the feed dog presser rod 26; a second adjusting body 28 that is screwed together so as to be able to move forward and backward in the vertical direction; and a second adjusting body 28 that is disposed between the feed dog presser bar 26 and the second adjuster body 28 and urges the feed dog presser bar 26 downward. The upper feed device of the sewing machine is equipped with a second spring 29 that moves, and the protruding portion that protrudes from the upper end surface of the operation knob 24 of the first adjusting body 23 on the same center line as the first adjusting body 23 has a A rotary body 30 for moving the second adjustment body 28 forward and backward in the vertical direction is attached rotatably via a rotor 32 but not movable in the vertical direction. Second adjustment body 2
A connecting shaft 35 is provided in a hanging manner to be fitted into an upper opening engaging hole 36 formed in the center of the connecting shaft 35, and the connecting shaft 35 and the engaging hole 36 are connected by fitting a square shaft and a square hole. They are fitted so that torque can be transmitted at all times, and the vertical movement of the second adjusting body 28 is set according to the permissible shaft length and hole depth, and the rotor 32 protrudes from the upper end surface of the operating knob 24. is rotatably fitted around the protrusion, and is provided immovably in the vertical direction between the retaining ring 31 fixed to the outer periphery of the tip of the protrusion and the operation knob 24; The upper feed device of a sewing machine, wherein the rotating body 30 is fixed to the outer periphery of the rotor 32 by a set screw 33.