JPS5936025B2 - Needle amplitude adjustment device for embroidery sewing machine - Google Patents

Description

[Detailed description of the invention] The present invention relates to a needle amplitude adjusting device for an embroidery sewing machine.

The prior art will be explained with reference to FIG.

In this embroidery sewing machine, an operator places a knee pad 4 on the knee pad 4 while feeding the cloth frame 1 with the cloth to be embroidered in any direction on the "bed 3" on the table 2. Push it to the left and right as shown in Figure 1.

When the knee pad 4 is pushed to the right in FIG. 1, the push-up bar 5 is pushed up.

The upward displacement of the push-up bar 5 is transmitted to the needle 9 held on the needle bar 8 via a plurality of levers (not shown) built into the sewing machine head 6, a triangular cam, and a needle oscillating forked rod 7. be done.

As a result, the needle 9 vibrates alternately in the left and right directions in FIG. 1 every time it moves up and down once.

Moreover, the more strongly the knee pad 4 is pushed to the right, the more the amplitude of the needle 9 increases.

Such embroidery sewing machines are generally used for non-mass-produced embroidery, such as embroidery of high-class patterns and emblems, or name engraving, but it takes a relatively long time for an operator to become proficient in its operation.

The reason for this is that the amplitude of the needle 9 must be adjusted with the knee in relation to the movement of the hand that sends the cloth frame 1.

That is, the femur is relatively long and one end of the femur is pivotally supported by the hip joint.

Therefore, pushing and moving the knee plate 4 with the knee, which is the other end of the femur, is similar to grasping one end of a long rod and pushing an object with the other end, and the knee plate 4 It is difficult to finely adjust the amount of movement in the left and right direction.

Also, the muscles that move the knees from side to side are rarely used in daily life, so it is not easy to link the knees to the movements of the hands.

By the way, the fingers of the hand can make much more subtle movements than the knees.

Moreover, this is something that is done on a daily basis by linking the fingers to the movements of the hand.

Therefore, an embroidery sewing machine in which the amplitude of the needle 9 can be adjusted with a finger would be convenient because it would allow the operator to become familiar with the operation in a relatively short period of time.

The present invention has been made based on the above-mentioned viewpoints, and provides a method that allows adjustment of the needle amplitude with the fingers of the hand.
It is an object of the present invention to provide a needle amplitude adjusting device for an embroidery sewing machine that shortens the time required to become proficient in its operation.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 2 is a front view showing a part of an embroidery sewing machine according to an embodiment of the present invention.

A cloth frame 12 is slidably placed on a bed 11 on a table 10.

The needle amplitude adjustment device 13 includes an adjustment section 14 that is integrally provided on the fabric frame 12 and is used to adjust the needle amplitude with the fingers of the hand, and a push-up bar 19 that is used to drive the needle 18 held by the needle bar 17 in an amplitude manner. and a transmission section 16 that transmits the adjustment amount by the adjustment section 14 to the drive section 15.

The push-up operation of the push-up bar 19 by the drive unit 15 is transmitted to the needle bar 17 via a conventionally well-known mechanism built into the sewing machine head 20 and the needle oscillating forked rod 21, and the needle 18 is moved up and down once in response to the push-up operation of the push-up bar 19. Each time it moves, it vibrates alternately to the left and right in Figure 2.

FIG. 3 is a simplified sectional view taken along the section line A-B-C-D in FIG. 2.

The cloth frame 12 has an annular shape, and an annular inner frame 22 is fitted into the cloth frame 12.

The cloth 23 to be embroidered is stretched between the outer peripheral surface of the inner frame 22 and the inner peripheral surface of the cloth frame 12.

The adjustment section 14 includes a support frame 24 integrally fixed to the outer circumferential surface of the cloth frame 12, and an operation lever 26 rotatably supported within the support frame 24 by a pin 25.

An opening 27 is formed in the support frame 24, and one end of the operating lever 26 projects outward from the opening 27.

For example, the fingers of the right hand holding the cloth frame 12 are hung on one end of the operating lever 26, and the operating lever 26 can be rotated around the pin 25 by the fingers of the right hand.

One end of the transmission section 16 is connected to the other end of the operation lever 26, and the rotational movement of the operation lever 26 is connected to the transmission section 1.
6 to the drive section 15.

The transmission section 16 includes a cylindrical flexible guide tube 28 and a cable 29 that is slidable inside the guide tube 28 .

One end of the guide tube 28 is connected to the support frame 24 in the adjustment section 14.
One end of the cable 29 movably passes through the support frame 24 and is connected to the other end of the operating lever 26 .

FIG. 4 is a simplified sectional view taken along section line IV-IV in FIG. 2, and FIG. 5 is a sectional view taken along section line V-V in FIG.

The support frame 30 of the 1 drive unit 15 is fixed to the lower surface of the table 10.

An opening 31 is formed in the support frame 30, and a substrate 32 is detachably fixed to the support frame 30 so as to cover the opening 31.

A sliding plate 33 is provided so as to be slidable on the substrate 32 in the moving direction of the push-up rod 19, that is, in the vertical direction in FIG.

A pair of abbreviated guide members 34 and 35 extending vertically are fixed on the base plate 32, and the sliding plate 33 is attached to the base plate 32.
and guide members 34, 35 in the vertical direction in FIG.

On the sliding plate 35 is a support member 37 that supports a contact rod 36 extending in the vertical direction in FIG. 4 to abut against the push-up rod 19, and a support member 37 for driving the sliding plate 33 in the vertical direction in FIG. A cylinder 38 for this purpose and a switching valve 39 for selectively supplying compressed air to the cylinder 38 are each fixedly supported.

The support member 37 has a bottomed cylindrical shape with an open top, and the contact rod 36 is inserted into the support member 37.

An external thread 36a is formed at the bottom of the contact rod 36,
The external screw 36a passes through the bottom of the support member 37 so as to be freely screwable and retractable, and is projected downward.

A nut 40 is screwed into the protruding external screw 36a.

Therefore, screw the outer screw 36a forward and backward to tighten the nut 40.
By tightening, the vertical position of the contact rod 36 can be freely adjusted.

A disc-shaped contact plate 41 is fixed to the upper end of the contact rod 36 .

The push-up bar 19 is urged downward in FIG. 4 by a spring (not shown), and a roller 42 is rotatably supported at the lower end of the push-up bar 19 around a horizontal axis.

Therefore, the roller 42 is always in contact with the contact plate 41.

The cylinder 38 has an axis along the vertical direction in FIG. 4 and is supported by the sliding plate 33.

This cylinder 38 is a single-sided Rondo type double-acting cylinder,
The pinton rod 43 is fixed to the support frame 30.

The cylinder 38 has a hole 45 that communicates with the head side action chamber 44.
and a hole 47 communicating with the rond side action chamber 46 are formed respectively, and by the function of the switching valve 39, the name plate 45
, 47 to each working chamber 44, 46 in a switchable manner.

When compressed air is supplied to the head side action chamber 44,
The cylinder 38 and the sliding plate 33 are moved upward by the air pressure acting on the piston 48, and at this time, the rond side working chamber 46 is contracted and air is released from the hole 47.

Further, when compressed air is supplied to the rond side action chamber 46, the air pressure acting on the piston 48 causes the cylinder 38 to
moves downward, and at this time, the head-side working chamber 44 contracts and air escapes from the hole 45.

The interior of the main body 49 of the switching valve 39 is divided into three chambers 53, 54, .
It is divided into 55 sections.

An exhaust hole 56 is formed in the main body 49 so as to communicate with the chamber 53 at all times, and an exhaust pipe 57 is connected to the exhaust hole 56.

Further, an exhaust hole 58 is formed in the main body 49 so as to communicate with the chamber 55 at all times, and an exhaust pipe 59 is connected to this exhaust hole 58.

Furthermore, an air supply hole 60 is provided in the main body 49 to constantly communicate with the chamber 54.
is formed, and an air supply pipe 61 is connected to this air supply hole 60.

This air supply pipe 61 is connected to a compressed air supply source (not shown).

A spring 62 is housed in the chamber 53, and the spring force of the spring 62 urges the spool 50 downward in FIG.

The other end of the spool 50 extends through the main body 49 so as to be freely displaceable in the axial direction.

A roller 63 is pivotally supported at the other end of the spool 50, and the roller 63 is always in contact with a lever 64 that is rotated by an adjustment operation of the adjustment section 14.

Therefore, the spool 50 is displaced in the axial direction within the main body 49 as the lever 64 rotates.

The main body 49 has a valve hole 65 that is closed by a valve body 51, 52.
, 66 are formed respectively, and these valve holes 65 .
66 and the hole 45°47 of the cylinder 38 is connected to the connecting pipe 67.
68, respectively.

When the lever 64 is in the rest position as shown in FIG.
, 66 are closed by valve bodies 51 and 52, respectively.

The lever 64 has an oval shape, and its bent portion is connected to the spool 5.
The support frame 3 is rotatably supported by a pin 69 perpendicular to the axis of
It is pivoted to 0.

The roller 63 contacts one end of the lever 64 as described above.

Further, a negative end of a spring 70 is connected to one end of the lever 64, and the other end of the spring 70 is connected to a support piece 71 fixed to the support frame 30.

The spring 70 uses its spring force to move the lever 64 around the pin 69 in the direction shown by the arrow 72, that is, in the direction in which the spool 50 elastically abutting one end of the lever 64 is displaced downward in FIG. energize.

A bolt 73 is screwed onto the support frame 30 so as to abut near one end of the lever 64 to limit rotation of the lever 64 in the direction indicated by an arrow 72 .

The other end of the guide tube 28 of the transmission section 16 is fixed to the outer surface of the support frame 30.

The other end of the cable 29 movably passes through the support frame 30 and is attached to the other end of the lever 64 with a set screw 75 and a nut 76.
connected by.

Therefore, when the cable 29 is pulled in the direction shown by the arrow 74, the lever 64 is rotated in the opposite direction to the arrow 72 against the spring force of the springs 62 and 70.

When embroidering the cloth 23 stretched on the cloth frame 12,
While moving the needle 18 up and down, move the fabric frame 12 onto the bed 11.
to move it in any direction and rotate the control lever 26 of the adjustment section 14.

As a result, the amplitude of the needle 18 in the left-right direction in FIG. 2 is adjusted, and embroidery can be performed.

Move the operating lever 26 in the direction of arrow 77 (third direction) with the fingers of your right hand.
Assume that the rotation operation is performed (see figure).

By this rotation of the operating lever 26, the cable 29 of the transmission section 16 is pulled in the direction of arrow 78 (see FIG. 3).

Therefore, the cable 29 is pulled in the direction of the arrow 74 in the drive section 15, and the lever 64 is accordingly pulled by the springs 62, 7.
It is rotated in the direction opposite to the arrow 72 against the spring force of 0.

As a result, the spool 50 in contact with one end of the lever 64 is displaced upward in FIG. 4, and the valve hole 65 communicates with the chamber 54 and the valve hole 66 communicates with the chamber 55.

Therefore, the compressed air that is being supplied to the chamber 54 from the air supply hole 61 is supplied to the head-side working chamber 44 of the cylinder 38 via the valve hole 65, the connecting pipe 67, and the hole 45.

When the pressure of compressed air acts on this head-side working chamber 44, the cylinder 38 and the sliding plate 33 are pushed upward in FIG. 4.

At the same time, the contact rod 36 supported by the support member 37 moves upward, and the push-up rod 19 is pushed upward.

Since the main body 49 of the switching valve 39 is also fixedly supported by the sliding plate 33, the main body 49 is also displaced upward as the sliding plate 33 moves upward.

Moreover, since the spool 50 is biased by the spring 62, the spool 50 and the main body 49 are displaced relative to each other in the vertical direction, so that the valve holes 65 and 66, which were open, are closed by the valve bodies 51 and 52. It will be done.

Therefore, the supply of compressed air to the head-side working chamber 44 of the cylinder 38 is stopped, the upward movement of the sliding plate 33 is stopped, and the upward movement of the push-up rod 19 is stopped.

When the operating lever 26 is rotated in the direction opposite to the arrow 77 (see FIG. 3), the lever 64 is rotated in the direction of the arrow 72 by the spring force of the spring 70.

Therefore, the spool 50 is displaced downward by the spring force of the spring 62, and the valve holes 65 and 66 are opened.
3, and the valve hole 66 communicates with the chamber 54.

Therefore, compressed air flows into the rod side working chamber 4 of the cylinder 38.
6, and the cylinder 38 moves downward accordingly, and the push-up rod 19 descends and returns to its original position by the force of a spring (not shown).

In this way, by using the lever mechanism that combines the switching valve 39 and the cylinder 38, the push-up rod 19 can be pushed up or down depending on the amount of angular displacement of the operating lever 26.

Moreover, the force of the finger that rotates the operating lever 26 is the lever 6.
Only a small amount of force is required to rotate 4.

In the embodiment described above, the push-up bar 19 was driven using compressed air, but in another embodiment of the present invention, the push-up bar 19 may be driven by hydraulic pressure.

FIG. 6 is a block circuit diagram of another embodiment of the invention.

In this embodiment, an electric signal is transmitted to the drive unit 8 via an insulated wire serving as a transmission unit 82 in accordance with the amount of adjustment from the adjustment unit 80.
1.

In the drive section 81, the pulse smoke 83 is driven in response to the signal from the adjustment section 80, thereby adjusting the amplitude of the needle.

FIG. 7 is a simplified sectional view showing the vicinity of the adjustment section 80 in FIG. 6, and parts corresponding to the embodiments in FIGS. 2 to 5 described above are given the same reference numerals.

The support frame 84 of the adjustment section 80 is provided integrally with the cloth frame 12.

A guide hole 85 extending in the vertical direction (vertical direction in FIG. 7) is formed on the upper surface of the support frame 84, and a scale 86 is displayed on one side of the guide hole 85.

One end of a substantially 7-shaped operating lever 87 is fitted into the guide hole 85, and a knob 88 that projects upward from the guide hole 85 is provided with a knob 88 for indicating a scale.

The operating lever 8T is provided movably along the guide hole 85, and a rack 89 extending parallel to the guide hole 85 is provided at the other end.

FIG. 8 is a cross-sectional view taken along the section line ■--■ in FIG. 7.

A gear 90 meshes with the rack 89.

This gear 90 is provided in association with a low-resolution encoder 91.

A spring 92 connected to the support frame 84 is connected to one end of the rack 89, so that the gear 90 is connected to the spring 92.
It is urged to rotate in the direction shown by arrow 93 by the spring force.

Referring again to FIG. 6, the rotary encoder 91 generates a signal having a number of pulses depending on the rotation angle of the gear 90,
The signal is transmitted to the transmission section 82 via the amplifier 94.

FIG. 9 is a sectional view showing the drive section 81 of FIG.
The same reference numerals are given to parts corresponding to the embodiments in FIGS.

A support frame 95 of the drive unit 81 is provided on the lower surface of the table 10, and within this support frame 95, a control circuit 96, a DC power source 97.1 a drive circuit 98, and a pulse smoke 83 are provided.

Referring again to FIG. 6, the adjustment section 80 is
A signal transmitted from the control circuit 96 is input to the control circuit 96.

DC power supply 97 is a power supply for driving drive circuit 98 and pulse motor 83.

In the control circuit 96, the rotation direction and rotation angle of the pulse smoke 83 are determined according to the signal from the adjustment section 80, and the pulse smoke 83 is driven by the drive circuit 98 according to the signal from the control circuit 96.

FIG. 10 is a side view seen from arrow XX in FIG. 9.

A cam 100 is fixed to the output shaft 99 of the pulse motor 83.

This cam 100 is in contact with a roller 42 that is pivotally supported at the lower end of the push-up rod 19.

Therefore, the push-up rod 19 is driven in the vertical direction according to the rotational direction and angular displacement amount of the cam 100, that is, the rotational direction and rotational angle of the pulse motor 83.

With the fingers of the right hand holding the cloth frame 12, move the knob 88 to the arrow 1.
When the gear 90 is moved in the direction 01, the gear 90 rotates in the opposite direction to the arrow 93 against the spring force of the spring 92.

The pulse smoke 83 is driven via the control circuit 96 and the drive circuit 98 by a signal output from the low reencoder 91 in response.

The push-up rod 19 is pushed up or down depending on the rotation direction and rotation angle of the pulse motor 83.

Therefore, the amplitude of the needle is adjusted according to the push-up or push-down operation of the push-up bar 19.

As described above, according to the present invention, since the needle amplitude amount can be adjusted with the fingers of the hand in the adjustment section integrated with the cloth frame,
There is no need to adjust it with the knee as in the past, so it is convenient because the technique for finely adjusting the amplitude of the needle can be learned in a relatively short period of time.

Moreover, since the adjustment can be made with a relatively small force, physical fatigue is reduced.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the prior art, Fig. 2 is a front view showing a part of an embroidery sewing machine according to an embodiment of the present invention, and Fig. 3 is a section line A-B-C-D in Fig. 2. A simplified cross-sectional view from
FIG. 4 is a simplified cross-sectional view taken from section line IV-■ in FIG. 2, FIG. 5 is a cross-sectional view taken from section line ■--■ in FIG. 4, and FIG. A block circuit diagram of another embodiment, FIG. 7 is a simplified cross-sectional view showing the vicinity of the adjustment section 80 in FIG. 6, FIG. 8 is a cross-sectional view taken from the section line 9 is a sectional view showing the drive unit 81 in FIG. 6, and FIG. 10 is a side view taken along the arrow XX in FIG. 9. 11...Bed, 12...Cloth frame, 13
...Needle amplitude adjustment device, 14.80...
Adjustment section, 15.81... Drive section, 16.32.
...Transmission part, 18... Needle, 19...
・・Push-up bar, 26.87 ・・・・Operation lever, 29
... cable, 83 ... pulse motor, 9
9... Output shaft, 100... Cam.

Claims (1)

[Scope of Claims] 1. An adjustment unit provided on a filter cloth frame that is moved while being held by hand on the bed of a sewing machine, and is adjusted by the finger of the held hand; and a push-up bar that determines the amplitude of the needle. 1. A needle amplitude adjustment device for an embroidery sewing machine, comprising: a drive section that drives a push-up bar up and down; and a transmission section that transmits an adjustment amount operated by the adjustment section to the drive section. 2. The adjusting section includes an operating lever that can be rotated by a finger, the transmitting section includes a cable that is displaced in the longitudinal direction according to the amount of angular displacement of the operating lever, and the driving section adjusts the amount of displacement of the cable. 2. The needle amplitude adjusting device for an embroidery sewing machine according to claim 1, wherein said push-up bar is driven by fluid pressure in accordance with said needle amplitude adjusting device. 3. The adjusting section includes a low-return encoder that outputs a signal according to the amount of operation of the operating lever, and the driving section includes a pulse motor driven according to the signal from the encoder.
and a cam provided in connection with the output shaft of the pulse motor and abutting on the push-up bar, the transmission section being an insulated wire, the needle amplitude of the embroidery sewing machine according to claim 1. Regulator.