JP2000129564A - Embroidery tool driving mechanism of lace embroidery machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an embroidery tool driving mechanism of lace embroidery machine capable of reducing striking sound and/or vibration in operation. SOLUTION: This embroidery tool driving mechanism has a support for at least one embroidery tool among embroidery tools such as needle, borer and yarn guide reciprocating in the direction perpendicular to a cloth frame for attaching cloth to be embroidered, a rotation shaft rotated by power of a motor and at least one motion converting means for directly converting rotation motion of the rotation shaft to reciprocating motion of the embroidery tool support without interposing sliding motion in an embroidery machine for embroidering the cloth, having the cloth frame, at least one motor and these embroidery tools.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lace embroidery machine, and more particularly to an embroidery tool driving mechanism of the lace embroidery machine.

[0002]

2. Description of the Related Art A conventional embroidery tool driving mechanism of a lace embroidery machine converts a rotational motion of a prime mover into an oscillating motion by using an oscillating follower cam, and then converts the oscillating motion by using a slider crank mechanism. It was converted to the reciprocating motion of the embroidery tool. For example, FIG. 1 shows a needle driving mechanism for driving a needle which is one of embroidery tools of a lace embroidery machine.
That is, the conventional needle drive mechanism, generally designated by reference numeral 1, has a prime mover 2, and a small pulley 4 is attached to an output shaft 3 of the prime mover 2. A rotating shaft 5 extends in parallel with the output shaft 3, and a large pulley 6 is attached to the rotating shaft 5.
A first endless belt 7 is looped between the small pulley 4 and the large pulley 6. A third pulley 8 is also attached to the rotating shaft 5. A second endless belt 11 is provided between the third pulley 8 and a fourth pulley 10 attached to a cam shaft 9 extending parallel to the rotating shaft 5. Is hung around.

A plurality of pairs of cams 12, 1
3 is fixed. 2, the support shaft 14 extends parallel to the camshaft 9, and the first swing member 15 is fixed to the support shaft 14 corresponding to each pair of the cams 12 and 13. Each first swing member 15
At both ends, a first arm 16 and a second arm 17 are provided, and cam rollers 18 and 19 are rotatably attached to free ends of these arms, respectively. Each first swing member 15 also has a first arm 16 and a second arm 1 at both ends.
7, a third arm 20 is provided. This third arm 2
A support pin 21 is fixed to a free end of the first vertical swinging connecting rod 22. The support pin 21 is rotatably attached to one end of the first vertical swing connection rod 22. A lower needle shaft 23 extends in parallel with the support shaft 14, and a lower needle shaft 23 has a second needle shaft 23 corresponding to each first swing member 15.
The swing member 24 is fixed. Each second swing member 24
Is provided with a first arm 25 at one end thereof, and a third arm 26 adjacent to the first arm 25. A pin 27 extends between these arms 25 and 26, The other end of the first vertical swing connection rod 22 is rotatably attached to 27.

Here, the cams 12 and 13 perform the function of the swing follower cam, and the cam rollers 18 and 19 serve as the swing follower via the above-mentioned several members to the lower needle shaft 23 and to the lower needle shaft 23. It transmits a swinging motion according to the shape of the cam. As shown in FIG. 1, the lower needle shaft 23 is also provided with a plurality of link mechanisms 29. Each link mechanism 29 includes a yoke member 30 fixed to the lower needle shaft 23. The yoke member 30 includes a pair of legs 31 and 32, and a pin 33 is provided between the legs.
Extends parallel to the axis of the lower needle shaft 23, and one end of a horizontal swing connection rod 34 is rotatably attached to the pin 33. The other end of the horizontal swing connection rod 34 is a needle support member 3 that supports a plurality of needles N.
5 is rotatably mounted on the mounting member 36. One end of a guide rod 37 extending parallel to the horizontal swing connection rod 34 is fixed to the mounting member 36 adjacent to the horizontal swing connection rod 34, and the guide rod 37 is attached to the lower needle shaft. The guide member 38 is rotatably attached to the guide member 38 and is inserted into a guide hole.

Here, the link mechanism 29 constitutes a crank slider mechanism. That is, the yoke member 39 functions as a crank, and the guide rod 37 serves as a slider.
Of the needle supporting member is converted into a forward and backward swinging motion of the needle supporting member. As can be clearly seen in FIG. 2, each second swing member 24
Is further adjacent to the third arm 26,
The second arm 39 is provided at the opposite end of the third arm 26, and the pin 27 extends through the third arm 26 and the third arm 26 and the second arm 3.
9 and extends. Between the third arm 26 and the second arm 39, one end of the second vertical swing connection rod 40 is rotatably attached to the pin 27. The upper needle shaft 41 extends in parallel with the lower needle shaft 23, and a third swing member 42 is fixed to the upper needle shaft 41, corresponding to each of the second swing members 24. Each third swing member 42 is formed of a yoke member, and the yoke member 42 includes a pair of legs 43 and 44. A pin 45 extends between these legs in parallel with the upper needle shaft 41, and the pin 45 has a second The other end of the vertical swing connection rod 40 is rotatably mounted. Further, the upper needle shaft 41 is provided with a plurality of link mechanisms 46 having the same structure as the link mechanism 29 of the lower needle shaft 23, and these link mechanisms 46 support the needle N similarly to the link mechanism 29. Needle support member 35 is attached. The link mechanism 46 also forms a crank slider mechanism like the link mechanism 29, and the repetitive rotation of the upper needle shaft is converted to the reciprocation of the needle support member.

In the conventional needle driving mechanism of a lace embroidery machine having the above structure, the rotation of the output shaft 3 of the prime mover 2 is transmitted to the rotation shaft 5 via pulleys 3 and 6 and an endless belt 7.
This rotational force is then transmitted to the camshaft 9 via the pulleys 8, 10 and the endless belt 11. Here, since the cams 12, 13 and the cam rollers 18, 19 constitute a swing follower cam, when the camshaft 9 rotates, the swing follower cam 12, which is conjugated to the camshaft 9,
13 rotates and the cam roller 1 which is a swing follower thereof
8 and 19 are caused to swing, and the first swing member 15 is repeatedly swung up and down in the direction indicated by the arrow A in FIG. When the first rocking member 15 is rocked upward, the first vertical rocking connecting rod 22 is moved upward, whereby the second rocking member 24 is moved to the lower needle shaft 2.
When the first swing member 15 swings downward around the center, the first vertical swing connecting rod 22
Is moved downward, whereby the second swing member 24 swings downward around the lower needle shaft 23. Thus, the second rocking member 24 is repeatedly rocked vertically in the direction indicated by the arrow B in FIG.

The lower needle shaft 23 is repeatedly rotated in the direction indicated by arrow C in FIG. 2 by the swing of the second swing member 24, and the yoke member 30 of each link mechanism 29 is rotated by the repeated rotation. In the direction indicated by arrow D in FIG.
It is rocked. Here, the link mechanism 29 constitutes a crank slider mechanism. When the yoke member 30 corresponding to the crank swings, the guide rod 32 serving as a slider reciprocates in the direction shown by the arrow E. Accordingly, the needle supporting member 35 supporting the needle N is reciprocated in a direction indicated by an arrow F in FIG. 1 with respect to a cloth (not shown) attached to a frame (not shown). Further, by the swing of the second swing member 24,
The second vertical swing connection rod 40 is reciprocated in the direction indicated by the arrow G in FIG. 1, whereby the third swing member 42 is swung in the direction indicated by the arrow H in FIG. The shaft 41 is repeatedly rotated repeatedly in the direction indicated by the arrow J in FIG. By the repetitive rotation of the upper needle shaft 41, the needle support member 35 reciprocates via the link mechanism 46 having the function of a crank slider, as in the link mechanism 29.

[0008]

In recent years, however, it has been required to increase the operating speed of drive mechanisms for embroidery tools in general, such as the above-described needle drive mechanism, a borer drive mechanism, and a thread guide drive mechanism. For example, when the needle drive mechanism of the conventional race embroidery machine adopting the above-described swing follower cam and crank slider mechanism is operated at high speed, the first swing member 15 and the second swing member 24 are used.
And the third oscillating member 42 performs an oscillating motion of constantly repeating abutment with these connecting members,
Since the rocking member 15 is driven by the cams 12 and 13 and the abutment is constantly repeated between the two, the yoke member 30 is further rocked and the abutment with the horizontal rocking connecting rod 34 is constantly performed. This causes intense striking noise and vibration between these abutting members, which is an obstacle to operating the needle drive mechanism at high speed.

A similar problem occurs in general embroidery tool driving mechanisms such as a borer driving mechanism and a thread guide driving mechanism. In a embroidery tool driving mechanism of a race embroidery machine, a swinging member or a rotating member is used, and these are operated at high speed. Occasionally, these members cause intense tapping and vibration. Furthermore, in the above-mentioned needle driving mechanism, the needle support 1 is determined by the cam curves of the cams 12 and 13 provided at both ends.
37 movements are determined. However, since many parts including the needle shaft 23 are interposed between the cam and the needle support, the needle support 137 is originally intended by the cam curve due to the twist of the shaft, the play between the parts, and the like. There is a problem that the reciprocating motion that has been performed cannot be accurately performed.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems of the prior art, and provides an embroidery tool driving mechanism for a lace embroidery machine, which reduces a tapping sound and / or a vibration during operation. The purpose is to:

[0011]

In order to achieve the above object, an embroidery tool driving mechanism of a lace embroidery machine according to the present invention comprises a cloth frame for mounting a cloth to be embroidered, at least one prime mover, a needle, a borer and In an embroidery machine having an embroidery tool such as a thread guide and performing embroidery on a fabric, a support for at least one of the embroidery tools reciprocating in a direction perpendicular to the cloth frame and a rotary motion by the power of a motor. A rotary shaft, for directly converting the rotary motion of the rotary shaft into a reciprocating motion of the embroidery tool support without involving a swinging motion;
It has at least one motion conversion means. In the embroidery tool driving mechanism according to the present invention, it is preferable that the motion converting means includes a linear follower cam.

An embroidery tool driving mechanism for a lace embroidery machine according to the present invention is an embroidery tool for a lace embroidery machine having a motor having an output shaft, an embroidery tool support for supporting an embroidery tool, and a frame for mounting a fabric to be embroidered. In a tool driving mechanism, a rotation shaft, a rotation transmitting means for transmitting the rotation of the output shaft of the motor to the rotation shaft, and the rotation of the rotation shaft, the rotation of the rotation shaft, the embroidery tool of the embroidery tool support for the fabric attached to the frame At least one embroidery tool motion converting means for converting to reciprocating motion may be provided. In the present invention, the embroidery tool support for supporting the embroidery tool is constituted by the first needle support for supporting the needle, the rotating shaft is constituted by the first needle shaft, and the rotation transmitting means is constituted by the output shaft of the motor. The embroidery tool movement converting means is constituted by a first rotation transmitting means for transmitting the rotational movement to the first needle shaft.
At least one first for converting a rotational movement of the needle shaft into a reciprocating movement of a needle mounted on the first needle support relative to a fabric mounted on the frame.
It is good to be constituted by a needle movement conversion means.

A second needle shaft extending parallel to the first needle shaft; a second rotation transmitting means for transmitting a rotational movement of the first needle shaft to the second needle shaft; and a second rotation transmitting means for supporting the plurality of needles. Further comprising a two-needle support and at least one second-needle-motion converting means for converting the rotational movement of the second needle shaft into a reciprocating movement of a needle mounted on the second needle support relative to the fabric of the frame. Is preferred. In the present invention, the second rotation transmitting means may further include a first rotation transmitting means.
At least one bevel gear attached to the needle shaft, at least one bevel gear attached to the second needle shaft, at least one bevel gear meshing with the bevel gear of the first needle shaft, and at least one bevel gear meshing with the bevel gear of the second needle shaft. It is preferable to have two connecting shafts.

In the present invention, the first needle motion converting means may further include a pulley fixed to the first needle shaft, a cam shaft extending in parallel with the first needle shaft, and a pulley attached to the cam shaft. , First
A needle shaft pulley, an endless belt wrapped around the camshaft pulley, a fixed support member bearing the camshaft, a pair of main cam and sub cam fixed to the camshaft, and a camshaft penetrating therethrough. 1
A pair of sliding plates having slots extending in a direction in which the needle support reciprocates, a connecting plate connecting the pair of sliding plates, and a reciprocating motion connecting the sliding plate and the first needle support; A rod, a main cam roller rotatably mounted on one of the slide plates between the main cam and the first needle support, and a rotation on the other slide plate behind the sub-cam relative to the first needle support. And a sub-cam roller freely mounted.When the main cam advances the sliding plate with respect to the cloth through the main cam roller by rotation of the cam shaft, the sub-cam slides the sliding plate through the sub-cam roller. The sub-cam moves the slide plate most backward with respect to the fabric via the sub-cam roller by the rotation of the cam shaft. When the, main cam begins to have advance the slide plate against the dough through a main cam roller, thereby reciprocating the slide plate without play, it is preferable.

This needle motion conversion mechanism constitutes a linear motion follower cam mechanism. In other words, the main cam and the sub cam correspond to the original stage of the direct acting follower cam, and the cam roller, the sliding plate, and the reciprocating rod constitute a direct acting follower system,
The needle support fixed to the follower system reciprocates linearly. In the present invention, the second needle motion converting means may further include a pulley fixed to the second needle shaft, a second cam shaft extending parallel to the second needle shaft, a pulley attached to the cam shaft, 2
An endless belt wrapped around a pulley of a needle shaft, a pulley of a second camshaft, a second fixed support member bearing the second camshaft, a pair of second main cams fixed to the second camshaft, and The second sub cam and the second
A pair of second sliding plates having a second slot extending through the camshaft and extending in a direction in which the second needle support reciprocates; a connecting plate connecting the pair of second sliding plates; A second reciprocating rod connecting the second sliding plate and the second needle support, and a second reciprocating rod rotatably mounted on one of the second sliding plates between the second main cam and the second needle support. Main cam roller and second
A second sub-cam roller rotatably mounted on the other second sliding plate behind the second sub-cam with respect to the needle support, wherein the second main cam is rotated by the rotation of the second cam shaft. When the second sliding plate is moved forward with respect to the fabric through the second sub-cam roller, the second sub-cam starts moving backward with respect to the fabric via the second sub-cam roller. When the sliding plate is moved most backward with respect to the cloth via the second sub-cam roller by the rotation of the second main cam, the second main cam starts to advance the sliding plate with respect to the cloth via the second main cam roller. Preferably, the sliding plate is reciprocated without play.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a needle driving mechanism of a lace embroidery machine will be described below with reference to the accompanying drawings. As shown in FIG. 3, a needle drive mechanism generally designated by reference numeral 100 has a prime mover 102, and an output shaft 103 of the prime mover 102 has a small pulley 1 attached thereto.
04 is attached. A first rotating shaft 105 extends in parallel with the output shaft 103, and a large pulley 106 is attached to the first rotating shaft 105, and a small pulley 104 and a large pulley 106
A first endless belt 107 is looped between them.
A third pulley 108 is also attached to the first rotating shaft 105, and the fourth pulley 1 attached to the third pulley 108 and a second rotating shaft 109 extending in parallel with the first rotating shaft 105.
The second endless belt 111 is looped between the belts 10.

The second rotating shaft 109 has a plurality of fifth pulleys 1.
12 is fixed. The first needle shaft, that is, the lower needle shaft 113 extends in parallel with the second rotation shaft 109, and the lower needle shaft 113
A sixth pulley 114 is fixed corresponding to the pulley 112. A third endless belt 115 is looped between the fifth pulley 112 and the sixth pulley 114. The needle driving mechanism 1 further controls the rotational movement of the lower needle shaft 113 by using a direct-acting follower cam to move the first needle shaft 113 to a first embroidery cloth (not shown) attached to a frame (not shown).
It has a plurality of motion converting means for converting the reciprocating motion of the needle N supported by the needle support 137, that is, a first needle motion converting means 120.

Each of the first needle motion converting means 120 is provided with a seventh pulley 12 fixed to the lower needle shaft 113.
And an eighth pulley 1 fixed to one end of a camshaft 122 extending in parallel with the lower needle shaft 113.
23, and these pulleys 121 and 123 have a fourth
An endless belt 139 is wound around. Camshaft 1
Reference numeral 22 denotes a bearing at the upper part of each side wall of the fixed support member 124 having a U-shaped cross section. As can be clearly seen in FIG. 4, the two pairs of support rollers 125, 126 are fixed support members 124.
, And is supported by a lower portion of each side wall of the fixed support member 124. Each pair of support rollers 125, 12
The sliding plates 127 and 128 are arranged on 6. As can be clearly seen in FIG. 5, each sliding plate 127, 128
Are formed with horizontally extending slots 129 through which the camshaft 122 passes.
One end of the reciprocating rods 130, 131 is fixed to each sliding plate 127, 128, and one end of the rods 130, 131 is connected to the connecting plate 132.
Are connected to each other.

A fixed guide plate 133 is provided adjacent to the fixed support member 124, and has a pair of guide sleeves 134, 135 on the upper side surfaces thereof, and these guide sleeves 134, 135 are connected to the reciprocating rods 130, 13 respectively.
1 is passed. The other end of each of the reciprocating rods 130, 131 is fixed to brackets 136, and these brackets 136 are attached to a first needle support 137 that supports a plurality of needles N. As shown in FIGS. 4 and 5, a pair of main cam 140 and sub cam 141 are
Inside the slide plates 127, 128, the camshaft 1
22. The main cam roller 142 is located on the first needle support 137 side of the main cam 140 and is rotatably attached to the slide plate 128, and the sub cam roller 143 is located on the side of the sub cam 141 opposite to the first needle shaft. , Is rotatably attached to the sliding plate 127.

The main cam 140 and the sub cam 141 constitute a conjugate cam. That is, the camshaft 122
The main cam 140 is rotated by the rotation of the sliding plate 128, and the main cam 140 rotates through the main cam roller 142 of the sliding plate 128 (and the sliding plate 12 connected thereto).
7) is advanced in the direction toward the fabric of the frame, that is, with respect to the fabric of the frame.
When the cams 27 and 128 are advanced to the fabric of the frame, the sub cam 141 moves the sliding plate 127 (and the sliding plate 128 connected thereto) via the sub cam roller 143 of the sliding plate 127 to the fabric of the frame. , The sub cam 141 starts moving backward
When the sliding plates 127 and 128 are moved most backward with respect to the cloth via the sub cam roller 143 by the rotation of the main cam 140, the main cam 140 causes the sliding plates 127 and 128 to move with respect to the cloth of the frame via the main cam roller 142. It starts to move forward. This allows the sliding plates 127, 128 to reciprocate relative to the fabric of the frame without play.

That is, according to the present invention, the rotational movement of the camshaft 122 is converted into the first needle support 137 by the movement converting means, that is, the first needle movement converting means 120 which realizes the direct acting follower cam mechanism. Thus, the reciprocating motion of the needle N can be converted. Referring again to FIG. 3, the lower needle shaft 113 also has a plurality of bevel gears 150 mounted thereon. Each bevel gear 150 is engaged with a bevel gear 152 attached to a lower end of a connecting shaft 151 extending perpendicularly to the lower needle shaft 113 and perpendicular to the lower shaft. Connecting shaft 151
A bevel gear 153 is also attached to the upper end of the first bevel gear 153. The bevel gear 153 meshes with a second needle shaft extending parallel to the lower needle shaft 113, that is, a bevel gear 155 attached to the upper needle shaft 154.

The needle driving mechanism 1 also controls the rotational movement of the upper needle shaft 154 by rotating the needle N supported by the second needle support 161 with respect to the fabric of the frame.
A plurality of second needle motion converting means 160 for converting the reciprocating motion of the second needle motion;
The structure of 60 is exactly the same as the structure of the first needle movement converting means 120 of the lower needle shaft 113. next,
The operation (operation) of the above embodiment will be described. Prime mover 102
Is operated, the output shaft 103 rotates to rotate the small pulley 10
4 is rotated. Endless belt 1 rotates the small pulley 104
07, the rotation of the first rotating shaft 105 is transmitted to the second rotating shaft 109 via the pulleys 108, 110 and the endless belt 111, and the rotation of the second rotating shaft 109 is transmitted to the second rotating shaft 109. Rotates in the direction indicated by the arrow M in FIG.

The rotation of the second rotating shaft 109 is controlled by the pulley 1
The lower needle shaft 113 is rotated in the direction indicated by the arrow Q in FIG. Next, when the lower needle shaft 113 is rotated, the seventh pulley 121, the eighth pulley 123, and the fourth
The camshaft 122 is rotated via the endless belt 139. When the camshaft 122 rotates, the main cam 1
40 is rotated, the sliding plate 128 and the sliding plate 12 connected thereto via the main cam roller 142.
7 is advanced with respect to the fabric of the frame, i.e.
When the sliding plates 127, 128 are most advanced,
The sub cam 141 starts retreating the sliding plate 127 and the sliding plate 128 connected thereto via the sub cam roller 143 of the sliding plate 127 with respect to the fabric of the frame. Through the sliding plate 12
The main cam 140 starts moving the slide plates 127 and 128 forward with respect to the frame cloth via the main cam rollers 142 when the rollers 7 and 128 are moved most backward with respect to the frame cloth.

When the sliding plates 127, 128 are advanced, the reciprocating rod 13 fixed to these plates is moved.
0, 131 slides in each pair of guide sleeves 134, 135 of the fixed guide plate 133, and the bracket 1
The first needle support 137 and the needles N supported by the first needle support 137 are advanced with respect to the fabric of the frame via 36. On the other hand, when the sliding plates 127 and 128 are retracted, the first needle support 137 and the needles N supported by the first needle support 137 are retracted with respect to the fabric of the frame via the reciprocating rods 130 and 131. Here, the conjugate cam 1
40, 141 are the original sections of the linear motion follower cam mechanism,
Cam rollers 142 and 143, sliding plates 127 and 12
8. The reciprocating rods 130 and 131 constitute a linear follower. In addition, the reciprocating rods of the guide sleeves 134 and 135 perform reciprocating linear motion to fulfill the function of a slider. Thus, by the rotation of the camshaft 122,
The first needle support fixed to the follower system of the linear follower cam mechanism and the needle N supported by the first needle support reciprocate in a direction indicated by an arrow R in FIG.

When the lower needle shaft 113 is rotated, the upper shaft 154 is moved to an arrow in FIG. 3 via the bevel gear 150 of the shaft, the bevel gears 152 and 153 of the connecting shaft 151 and the bevel gear 155 of the upper needle shaft 154. It is rotated in the direction indicated by P. Due to the rotation of the upper needle shaft 154, the second needle support member 161 and the needle N attached to the second needle motion converter 160 are connected via the second needle motion converter 160 provided on the upper needle shaft 154. Reciprocate with respect to the fabric of the frame in the direction indicated by arrow S in FIG. The operation of the second needle motion converting means 160 of the upper needle shaft 154 is the same as the operation of the first needle motion converting means 120 of the lower needle shaft 113, and thus will not be described again here.

As described above, the lower needle shaft 1
13 is rotated by the bevel gear 150 and the connection shaft 151.
The upper needle shaft 154 is rotated via the bevel gears 152 and 153 and the bevel gear 155 of the upper needle shaft 154. Thus, according to the present invention, the rotational movement of the lower needle shaft 113 is transmitted to the upper needle shaft 154 as it is.
Therefore, the present invention provides a swing member 24, 42 that repeats abutment with each other as in the prior art needle drive mechanism 1.
And the connecting member 40 for connecting these components does not repeatedly and repeatedly rotate the upper needle shaft. Therefore, the striking sound and the vibration caused by the abutment of the swinging member in the conventional needle driving mechanism can be significantly reduced. it can.

Further, according to the present invention, a constant-speed rotary motion capable of transmitting relatively accurate motion is transmitted to the needle shaft near the moving end, and immediately before the needle support which is the moving end, In addition, since the cam is arranged for each block, there is an advantage that the movement of the needle support is an accurate movement very close to the movement intended by the cam curve. The present invention is not limited to the embodiments described above, and various modifications as described below are possible. For example, in the above embodiment, the present invention is applied to a needle driving mechanism, but the present invention can be widely applied to embroidery tool driving mechanisms in general, such as a borer driving mechanism and a thread guide driving mechanism, in addition to the needle driving mechanism.

In the above embodiment, the rotation of the output shaft 103 of the prime mover 102 is controlled by the lower needle shaft 113.
The plurality of pulleys 10 are transmitted in
Although four, 106, 108, 110, 112, 114, a plurality of endless belts 107, 111, 115, and a plurality of rotating shafts 105, 109 are used, the structure of this embodiment is applied to the space of the applied lace embroidery machine. Other means can be adopted as long as the required driving torque can be obtained, and other means can be adopted, for example, the output shaft of a motor or The output shaft of the gear train connected to the output shaft and the lower needle shaft 113 may be directly connected without using the rotating shafts 105 and 109. In the above embodiment,
Rotational movement of the lower needle shaft 23 is performed by moving the upper needle shaft 154 to the bevel gear 150 and the connecting shaft 1.
Although transmitted via the bevel gears 152 and 153 of the 51 and the bevel gear 155 of the upper needle shaft 154, the transmission of the rotational motion may be achieved by other known means such as a pulley and an endless belt. Similarly, in the above-described embodiment, the pulley and the endless belt are used for transmitting the rotational motion between the first rotary shaft 105 and the second rotary shaft 109 and transmitting the rotary motion between the multiple rotary shafts. However, transmission of the rotational motion between the rotating shafts may be achieved by other known means such as a bevel gear instead of the pulley and the endless belt.

Further, in the above-described embodiment, in order to increase the productivity per installation space, two upper and lower
A lace embroidery machine with a stepped embroidery mechanism has been described. Therefore, an upper needle shaft 154 is provided in addition to the lower needle shaft 113. However, when a single-stage embroidery mechanism is sufficient, such as a lace embroidery machine for a sample, the upper needle shaft 154 and means 150, 151, 152, 153, 155 for rotating the upper shaft are used.
The second needle reciprocating means 160 and the second needle support 161 relating to the upper needle shaft 154 can be omitted, and an embroidery mechanism using only one needle shaft of the lower needle shaft 113 can be provided. Conversely, a lace embroidery machine having three or more embroidery mechanisms is also possible.

[0030]

As described above, the present invention can provide an embroidery tool driving mechanism for a lace embroidery machine, which can reduce the tapping sound and / or vibration during operation.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a needle driving mechanism of a conventional lace embroidery machine.

FIG. 2 is a partially enlarged view of the needle driving mechanism of FIG.

FIG. 3 is a schematic perspective view of one embodiment of a needle driving mechanism of the lace embroidery machine according to the present invention.

FIG. 4 is an enlarged view of the needle driving mechanism of FIG.

FIG. 5 is a schematic partial sectional view of the needle driving mechanism of FIG. 3;

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 needle driving mechanism of lace embroidery machine 102 motor 103 output shaft 113 first needle shaft 120 first needle reciprocating means 137 first needle support N needle

Claims (2)

[Claims] 1. An embroidery machine for embroidering a cloth, comprising a cloth frame for mounting a cloth to be embroidered, at least one prime mover, and embroidery tools such as needles, borers, and thread guides. A support for at least one of the embroidery tools reciprocating in a direction, a rotating shaft rotating by the power of the prime mover, and the embroidery tool support rotating the rotating shaft without oscillating movement. An embroidery tool driving mechanism for a lace embroidery machine, comprising at least one motion converting means for directly converting the reciprocating motion into a reciprocating motion. 2. An embroidery tool driving mechanism for a lace embroidery machine according to claim 1, wherein said motion converting means comprises a linearly driven follower plate cam.