JPS63275382A - Cloth presser of cycle sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Field of Industrial Application] This invention relates to a cycle sewing machine, and more particularly to a presser foot device for a cycle sewing machine that allows easy adjustment of the presser foot position prior to sewing work. .

[Prior Art] Conventionally, a cloth presser device for a cycle sewing machine normally presses the cloth downward with the biasing force of a spring, and when releasing the cloth or inserting the cloth, a cam or the like is used to press the cloth downward. This produced a force that resisted the biasing force of the spring (Special Publication Publication No. 60-273)
No. 07, Utility Model Application No. 61-56965).

[Problems to be solved by the invention] Since the presser force is exerted only by the spring, the biasing force of the spring itself must be very strong, and as a result, the spring has to be large. Furthermore, even if the operator attempts to raise the presser foot by operating a lever with his or her hands or feet against the spring, an excessive amount of force is required, making the operation difficult. In addition, even if you attempt to temporarily press the fabric by lowering the rising presser foot to adjust the fabric position, the presser foot will rise due to the mechanical force of the cam, so the presser foot will resist this. It was impossible to lower it and required other special mechanisms.

In this manner, the conventional presser foot cannot be raised or lowered by the operator at will.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems and provide a presser foot device that can temporarily press the cloth by lowering the presser foot at any time by operation at least when the presser foot is raised. One structure was used.

[Means for Solving the Problems] That is, the gist of the present invention is that a presser foot, which is movably disposed on the bed surface of the sewing machine across the vertical movement path of the needle, is moved at the start or end of sewing. In the presser foot device of a cycle sewing machine, which presses against or separates from the bed surface in conjunction with a contact that is in contact with the contact surface of a rotating cam, the presser foot is always urged and separated in the opposite direction from the bed surface. A biasing means, and an operating means for pressing the presser foot against the bed surface against the biasing means when operated, and a contactor pressed by rotation of the cam at the start of sewing is applied to the biasing means. The cycle is characterized in that the presser foot is pressed against the bed surface, and when sewing is completed, the contactor releases the presser foot by rotation of the cam, and the biasing means separates the presser foot from the bed surface. It's in the presser foot device of the sewing machine.

[The operating biasing means biases the presser foot away from the bed surface in a direction opposite to the bed surface. Therefore, it is sufficient that the biasing force is sufficient to lift the presser foot. As a result, when the presser foot is rising, the operator can arbitrarily press the presser foot against the bend surface using the operating means against the biasing means. On the other hand, when starting sewing on a cycle sewing machine,
By the rotation of the cam, the contact presses the presser foot against the bed surface against the urging means, or releases the presser foot, and the urging means separates the presser foot from the bed surface. In this way, the direction of the operating force during operation and the direction of the cam force do not conflict with each other, making the operation easier.

[Example] Next, the present invention will be explained in detail. The present invention is not limited to these, but includes various embodiments without departing from the gist thereof.

FIG. 1 is a right side view showing the main parts of the cycle sewing machine of this embodiment, and FIG. 2 is a diagram showing the internal structure of the main parts as seen from the front.

However, in FIG. 2, the clutch, stopper, etc. of the main shaft are not shown in order to explain the main parts.

A fixed support shaft 3 protrudes from the side plate 1a of the sewing machine frame 1 from inside the sewing machine frame 1, and the support shaft 3 includes a power cam 5, a spring 7, a clutch body 9, and a power pulley 11.
is rotatably attached to the shaft.

The power cam 5 brings the contact end 13a of the oval-shaped contactor 13 into contact with the contact surface 5a formed on its outer periphery, and
By engaging a similar engaging pawl 9a of the clutch body 9 with an engaging pawl 5b protruding toward the clutch body 9 in parallel with the axis of the support shaft 3, the clutch body 9 can be moved in the axial direction. , when the clutch body 9 rotates, the clutch body 9
Obtain rotational driving force from. The spring 7 is arranged in a compressed state between the power cam 5 and the clutch body 9, and is always connected to the clutch body 9.
is urged toward the power pulley 11.

A cam groove 9b having a substantially rectangular cross section is provided on the outer periphery of the clutch body 9, and this cam n9b has roller members 17a and 19a provided at the tips of two arms 17 and 19 of the arms of the power drive lever 15. has been inserted. The cam groove 9b is provided with a smooth protrusion 9c on the side surface on the power cam 5 side at one point in its rotational phase. Therefore, when either of the inserted roller members 17a, 19a rides on the protrusion N9c, the Kurasochi body 9 separates from the power pulley 11 against the biasing force of the spring 7.

The clutch body 9 has a conical contact surface 9d facing the power pulley 11, and when this contact surface 9d separates from the power pulley 11, it is driven and rotated by an electric motor (not shown). No driving force can be transferred from the power pulley 11, and the rotation stops. At this time, the power cam 5 that is interlocked with the clutch body 9 also stops rotating.

The power-driven bar 15 has a starting pedal wire 21 (not shown) installed on the other arm thereof, and is linked to a substantially U-shaped cam plate 25 by a clutch linking rod 23 that is pivotally supported. The cam plate 25 connects and disconnects the rotational driving force to the sewing machine main shaft 27. By pressing the steel ball 28 with the convex part of the cam plate 25, the main shaft power pulley 29 is brought into contact with a clutch body (not shown), and the sewing machine The sewing operation starts. In the state shown in FIG. 1, the steel ball 28 is not pushed and no driving force is transmitted to the main shaft. Immediately after the end of the sewing operation, the stopper tie 31a at the tip of the stopper 31 collides with g33a of the stopper cam 33 to stop the rotation of the main shaft 27 at a predetermined rotational phase.

On the other hand, a presser lever 35 is coaxially attached to the contactor 13, and the presser lever 35 is attached to the contact end 13 of the contactor 13.
A locking pawl 35 contacts the arm 13b on the opposite side from a.
A is provided. A wire 36 of a presser pedal (not shown) is installed at the tip of the presser lever 35. The contactor 13 and the presser lever 35 are each tensioned with springs 41 and 43 extending between the locking holes 37 and 39 provided in the upper side plate 1a. A pulling force is applied to the lever 35 in the counterclockwise direction.

A rod 45 is swingably supported at one end of the tip of the rotation 13b of the contactor 13, and the other end of the rod 45 is an abbreviated swinging member fitted into a shaft 46 attached to the sewing machine frame 1. It is swingably supported by tPff47a of the movable lever 47. Other F of the swing lever 47! A rod 49 is swingably supported at one end of the rod 47b, and the other end of the rod 49 is connected to a shaft 5 attached to the sewing machine frame 1.
It is swingably supported by an arm 51a of a substantially T-shaped swing lever 51 that is fitted into the arm 51a. The arm 51a of the swinging bar 51 is provided substantially perpendicularly to the arm 51a of the swinging bar 51. A rod 53 that vertically penetrates and protrudes downward from the lower wall 52 of the sewing machine arm is swingably supported at the tip of the sewing machine arm 51b. A presser plate 55 is attached to the tip of the rod 53 with its lower surface parallel to the horizontal plane. A U-shaped spring press plate 57 is in contact with the press plate 55 with its hemispherical protrusion 57a. Both ends of the spring presser plate 57 are swingably supported at both ends of a shaft 61 that is provided penetratingly near the upper end of the vertical column 59a of the presser llR59. The above pillar 59
A substantially dogleg-shaped arm 59b is integrally provided at a right angle to the tip of a, and a pair of pressing springs 63 forming a loop 63a at one location are arranged along both sides of this arm 59b. It is set up. One end of this presser spring 63 is swingably supported by a shaft 61, and the other end is a presser foot 67 slidably inserted into a sliding groove 65a of a tip member 65 of an arm 59b of the presser arm 59.
is engaged with. Further, the presser spring 63 is located between the shaft 61 and the loop 63a, and is located between the hemispherical protrusion 57a of the spring presser plate 57.
It is inserted into a through hole of a claw portion 57b provided on both side surfaces of. Further, a spring 71 is supported on the shaft 61 over both sides of the presser arm 59, and the center portion 71a of the spring 71 is supported by the support 59a.
The ends 71b are engaged with pressing springs 63 on both sides, and the tips of the pressing springs 63 are biased in a direction away from the bed surface 69. The biasing force is strong enough to lift the presser spring 63 and presser foot 67. Therefore, the swing of the contact 13 is caused by the movement of the rod 45, the swing lever 47, and the rod 4.
9. The information is transmitted to the presser foot 67 at the tip of the presser arm 59 through the swinging lever 51, the rod 53, the spring presser plate 57, and the presser spring 63, and the presser foot 67 is moved against the cloth 73 on the bed surface 69.
are pressed together or separated.

Further, a rod 75 is pivotally supported on the remaining 15!51c of the swing lever 51, and the other end of the rod 75 is a swing lever in the shape of an abbreviated character fitted into a shaft 77 attached to the sewing machine frame 1. It is swingably supported by H79a of 79. A wiper connection plate 8 is attached to the other arm 79b of the swing lever 79.
1 is swingably supported at one end thereof, and a wiper series connecting plate 8
The other end of 1 protrudes from the sewing machine frame 1 to the outside, and connects a wiper arm 85 attached to a wiper arm support 83 fixed to the sewing machine frame 1 to a needle 89 attached to the tip of a needle bar 87 and a presser foot 67. It crosses between the tip end 67a and serves to pull out the thread that has been cut after sewing.

In the presser foot device of the cycle sewing machine of this embodiment constructed as described above, the power cam 5 is at a low phase position with respect to the contact 13 as shown in FIG. 1 before the starting pedal is depressed. As a result, due to the urging force of the spring 41 as the urging means, the contact end 13a in contact with the contact surface 5a is at the limit position of left rotation, the rod 45 is at the limit position of rising, and the bar 47 is swung. is at the limit position for left rotation as shown by the dashed line in FIG. It is at the limit of ascent. Therefore, the presser plate 55 at the tip of the rod 53 is spaced apart from the hemispherical protrusion 57a of the spring presser temporary 57, and the spring presser plate 57 is not subjected to any pressing force. The tip of the presser foot 67 is raised, and the tip 67a of the presser foot 67 is attached to the cloth 7.
3, and the cloth 73 is in an unrestricted state.

When the operator depresses the presser foot pedal, the presser lever 35 is pulled downward, and the contact 13 engaged with the locking pawl 35a is pulled downward.
However, as the contact end 13a rises from the contact surface 5a, it rotates clockwise.

As a result, the rod 45, the swinging lever 47, the rod 49, the swinging lever 51, and the rod 53 are interlocked, the holding plate 55 of the rod 53 is lowered, and the spring holding plate 57 is
It rotates counterclockwise against the urging force of 1. the result,
The tip of the spring 63 descends, and the presser foot 67 engaged with the tip presses and restrains the cloth 73 against the bed surface 69 with its tip 67a. In this way, even before the starting pedal is depressed, the position of the cloth can be adjusted and temporarily fixed prior to sewing work by depressing the presser foot pedal. Of course, when the presser foot pedal is released, the fabric 73- can be released and readjusted.

If the start pedal is depressed while the presser foot pedal is still depressed or after the presser foot pedal has been released,
As shown in Fig. 2, the bar 15 is rotated by power drive.
The roller member 17a provided at the tip of the roller member 1817 separates from the cam groove 9b of the clutch body 9. At the same time, roller member 1
9a is inserted into the cam groove 9b of the clutch body 9. At this time, the protrusion 9c of the cam groove 9b comes off the roller member 17a,
The clutch body 9 is pressed toward the power pulley 11 by the springs 7, and receives a driving force from the power pulley 11 to rotate. Due to this rotation, the high phase position of the power cam 5 pushes up the contact end 13a of the contactor 13, resulting in a state similar to the state in which the presser foot pedal is depressed, and the presser foot 6
The tip 67a of the cloth 73 will restrain the cloth 73. However, since the presser foot pedal has already been pressed here, even if the start pedal is pressed, the contact end 13a remains raised and its position does not change; however, even if the presser foot pedal is released after this, the contact end 13a will continue to rise until the sewing is finished. It remains as it is.

When the power cam 5 rotates half a turn, the roller member 19a rides on the protrusion 9c, and the clutch body 9 separates from the power pulley 11, so the rotation stops at that phase.

A recess is provided at the bottom of the cam groove 9b in the protrusion 90 portion, and the roller member 19a is fitted into this recess, allowing further rotation of the power drive lever 15, and as a result, the cam plate interlocked with the clutch linking rod 23. 25 connects the clutch body of the main shaft to the power pulley 29, and the sewing operation is started.

Thereafter, during the sewing operation, the feed cam (not shown) rotates in conjunction with the rotation of the main shaft, and the vertical feed cam lever and horizontal feed cam lever that are in contact with the cam surface of this feed cam swing.
The feed base to which the support column 59a of the presser arm 59 is fixed is moved on the bed surface 69. During the sewing operation, the presser plate 55 is
It is pressed against the hemispherical protrusion 57a of the spring holding plate 57 in a sliding state. The shape of the sliding surface of the holding plate 55 is set to match the movement range of the vertical cam lever and the horizontal cam lever, so that it does not come off the hemispherical protrusion 57a.

When the feed cam rotates once, the control roller at one end of the clutch cam lever falls into a notch in a clutch cam (not shown) that rotates on the same axis, and as a result, the claw 91 at the other end of the clutch cam lever engages the power drive lever 15. When released, the power drive lever 15 is rotated clockwise by the biasing force of a spring (not shown) provided on the cam plate 25 or the like of the main shaft. Therefore, the roller member 19a provided at the tip of the arm 19 of the power drive lever 15 separates from the cam groove 9b of the clutch body 9.

At the same time, the roller member 17a is inserted into the cam groove 9b of the Kurasochi body 9. At this time, the protrusion 9C of the cam groove 9b comes off from the roller member 19a, and the clutch body 9 is pressed toward the power pulley 11 by the springs 7, and receives the driving force from the power pulley 11 to rotate. Due to this rotation, the low phase position of the power cam 5 allows the contact end 13a of the contactor 13 to descend, and the presser plate 55 springs into the presser plate 570 and the hemispherical protrusion 5
7a, and release the tip 67a of the presser foot 67 of the cloth presser device.
is separated from the cloth 73. In this way, the condition of the presser foot device returns to its original state, and the next sewing operation becomes possible.

Effects of the Invention In the present invention, the biasing means always biases the presser foot away from the bed surface in a direction opposite to the bed surface. Therefore, the urging force only needs to be sufficient to raise the presser foot, and when the presser foot is rising, the presser foot is arbitrarily pressed against the bed surface using the operating means against the urging means, Adjustments such as positioning can be made.

On the other hand, when a cycle sewing machine starts sewing, the contactor presses the presser foot against the bed surface against the urging means by the rotation of the cam, or releases the presser foot and the urging means presses the presser foot against the bed surface. In order to separate it from the surface, the direction of the operating force during operation and
Since the direction of the cam force does not conflict, operation becomes easier.

[Brief explanation of the drawing]

FIG. 1 is a right side view showing the main parts of the cycle sewing machine of this embodiment, and FIG. 2 is a diagram showing the internal structure of the main parts as seen from the front. 5... Power cam 13... Contactor 15
... Power drive lever 35 ... Presser lever 35
a...Latching claw 41, 43...Spring 45
．． 49.53...-rod 47.51...swing lever

Claims (1)

[Claims] A presser foot movably disposed on the bed surface of the sewing machine across the vertical movement path of the needle is interlocked with a contactor in contact with the contact surface of a rotating cam at the start or end of sewing. In a presser foot device of a cycle sewing machine that presses against or separates from a bed surface, there is provided a biasing means that always urges and separates the presser foot in a direction opposite to the bed surface, and a biasing means that presses the presser foot against the bed surface during operation. and an operating means for pressing the presser foot against the bed surface against the biasing means, and the contactor pressed by the rotation of the cam at the start of sewing presses the presser foot against the bed surface against the biasing means, and at the end of sewing, the presser foot is pressed against the bed surface. A presser foot device for a cycle sewing machine, characterized in that the contact element releases the presser foot when the cam rotates, and the urging means moves the presser foot away from the bed surface.