JPS6357077B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sewing machine with adjustable feed, and particularly to a sewing machine that is equipped with a main feed and a sub-feed, and whose feed amounts can be adjusted to a desired amount according to sewing work conditions. It is about a possible sewing machine.

A conventionally known sewing machine of this type is, for example, the sewing machine described in Japanese Patent Application Laid-Open No. 150154/1983.

Conventional sewing machines of this type are provided with adjustment shafts that control the feed amounts for main feed, sub-feed, and top feed, as well as the reverse feed amount, and these adjustment shafts are controlled through mechanical mechanisms such as links, arms, and cams. By coordinating the two to obtain a differential ratio, it was possible to cope with various sewing work conditions such as normal sewing, gathered stitching, and backstitching.

However, such conventional sewing machines have a complicated structure, are large in size, and cannot have a wide differential ratio, so the applicable range of sewing work conditions is narrow and it is difficult to change the sewing work conditions. This method has drawbacks such as having to stop the sewing machine each time and requiring complicated lever operations.

The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to provide a sewing machine with adjustable feed that is simple in structure and operation, can be made smaller and lighter, and can be adapted to a wide range of sewing work conditions. Our goal is to provide the following.

In order to achieve the above object, the present invention rotates each of the main feed, sub feed, and top feed adjustment axes separately using stepping motors, etc., and drives these stepping motors in conjunction with each other. The present invention is characterized in that the feed amount of the main feed, sub feed, and top feed can be obtained by controlling the feed amount according to various sewing work conditions.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

1 and 2 showing an embodiment of the present invention, a main feed stand 16 and a sub feed stand 1 of a sewing machine are shown.
8 carries a main feed 12 and a sub feed 14, respectively, and bifurcated portions 20 and 22 are formed at one ends of both stands 16 and 18, respectively. Eccentric bodies 26 and 28 fixed to a shaft 24 are fitted into both the bifurcated portions 20 and 22, respectively, and the shaft 24 is driven by a known drive means (not shown) to move the main feed 12 and the sub feed 14. gives rise and fall motion to.

At another position on the frame 10, a shaft 30, which is interlocked with the shaft 24, is rotatably supported in parallel with the shaft 24. Eccentric bodies 32 and 34 which are freely fitted are fixed respectively. Also,
A pair of concentric shafts 40 and 42 are supported at a predetermined distance from the shaft 30 of the frame 10, and the inner shaft 42 projects from the outer shaft 40. A bifurcated main horizontal feed left arm 44 is fixed to the outer shaft 40, and the main feed table 16 is pivotally attached to this arm 44. A sub horizontal feed left arm 46 is fixed to the inner shaft 42, and the sub horizontal feed table 18 is pivotally attached to this arm 46.

The free end of the eccentric rod 36 is pivotally connected to a pin 48 which is fixed to a link 50 and rotatably connected to a link 52. One link 52 is pivotally connected to a main horizontal feed right arm 56 by a pin 54, and this arm 56 is fixed to the outer shaft 40 by a boss. The other link 50 is pivotally connected to the arm 60 by a pin 58,
This arm 60 is fixed to a main adjustment shaft 62. The group of pins 48, 54, 58, links 50, 22, arms 56, 60, and main adjustment shaft 62
The arm 60 and the links 50 and 52 have the same effective length.

A worm wheel 66 is fixed to the main adjustment shaft 62, and a worm 68 is meshed with the wheel 66 so as not to be able to transmit rotation from itself, and the worm 68 is fixed to a motor shaft 72 of a stepping motor 70. ing.

The free end of the eccentric rod 38 is pivotally connected to a pin 88 which is fixed to a link 90 and rotatably connected to a link 92. One link 92 is pivotally connected to a sub-horizontal feed right arm 96 by a pin 94, and this arm 96 is fixed to the inner shaft 42 by a boss. The other link 90 is pivotally connected to the arm 100 by a pin 98,
This arm 100 is fixed to a sub-adjustment shaft 102. The pins 88, 94, 98, links 90, 9
2. The group of arms 96, 100 and sub-adjustment shaft 102 constitutes an adjusting device 104 for adjusting the feed amount of the sub-feed 14, and the arm 100, link 90,
92 have equal effective lengths.

A worm wheel 10 is attached to the sub-adjustment shaft 102.
6 is fixed, and a worm 108 is engaged with the wheel 106 so as not to rotate from itself, and the worm 108 is fixed to a motor shaft 112 of a stepping motor 110.

An upper feed adjustment shaft 114 is located above the main adjustment shaft 62 and the auxiliary adjustment shaft 102 of the frame 10 of the sewing machine.
is supported, and this shaft 114 is connected to a U-shaped member 124. Between the arms of this member 124 is another U-shaped member 126 with a pin 128.
The arm of this U-shaped member 126 is connected to a pin 130 that engages a link 132. This link 132
is pivotally connected to an upper horizontal feed right arm 136 by a pin 134, and this arm 136 is fixed to one end of a swing shaft 138. A main shaft 140 is supported at another position on the frame 10 in parallel to the swing shaft 138,
An eccentric body 142 is fixed to this main shaft 140. The eccentric body 142 is rotatably fitted with an eccentric rod 144, which imparts a swinging motion to the pin 130 about the pin 128. The upper feed adjustment shaft 1
14, U-shaped members 124, 126, pin 12
8, 130, 134, the link 132, the group of the upper horizontal feed right arm 136 constitutes the adjustment device 146, the upper horizontal feed right arm 136, the U-shaped member 124, 12
6 have equal effective lengths.

The upper horizontal feed left arm 1 is attached to the other end of the swing shaft 138.
48 are connected, and this arm 148 is connected to link 1.
50 to one arm 152A of the shaft 152. A link 154 shown in FIG. 1 is pivotally attached to the other arm 152B of this shaft 152.
This link 154 is connected to the upper feed 1 via a pin 156.
58. This upper feed 158 is carried by a pair of links 160, and this link 16
0 is pivotally connected to a support 164 fixed to a presser bar 162. This support 164 has a presser foot 16
6 is also fixed, and this presser foot 166 includes a presser foot 168 that cooperates with the main feed 12 and the sub feed. This presser foot 168 is provided with a notch 170 through which a pawl 172 of the upper feeder 158 that engages with the sewing material passes.

The presser rod 162 is formed into a hollow body,
A rod 174 is supported within the hollow. This rod 174 is provided at its lower end with a pin 178 that engages with a bifurcated member 176 of the upper feed 158. This rod 174 is adapted to be moved up and down in the axial direction in a known manner to ensure the up and down movement of the upper feed 158.

As shown in FIG. 2, a crank 180 is fixed to the main shaft 140.
0 is connected to the needle bar 18 via the needle bar crank rod 182.
It is linked to 8. This needle bar 188 is
0, and a needle 184 is attached to the tip. As shown in FIG. 1, this needle 184 is adapted to cooperate through a needle hole 192 with a hook (not shown) that is driven in a known manner below the throat plate 190, and the needle 184 of the needle Before and after the hole 192, there is a slit 1 through which the main feed 12 and the sub feed 14 pass.
94 and 196 are provided. Main feed 1
2 and the presser foot 168 of the presser foot 166 are arranged behind the needle hole 192 when viewed in the sewing direction, and the sub feed 14 and the upper feed 158 are arranged in front of the needle hole 192 so as to engage with the sewing material.

As shown in FIG. 2, the upper feed adjustment shaft 114
A worm wheel 116 is fixed to the
A worm 118 is meshed with this wheel 116 so as to be unable to transmit rotation from itself. This worm 118 is fixed to a motor shaft 122 of a stepping motor 120.

Further, as shown in FIG. 2, a pin 74 is supported at an appropriate location on the casing (not shown), and a lever 76 fixed to this pin 74 has a reverse stitch button 78 manually operated by the sewing machine operator. A reverse stitch switch 80 is provided which closes when pressed. Further, as shown in FIG. 2, an irregular stitch command pedal 84 is disposed at a suitable location on the outside of the casing, and is provided with an irregular stitch switch 82 therein, which is closed when the sewing machine operator presses the button.

Further, an operation panel 198 as shown in FIG. 9 is installed at a suitable location outside the casing, and this operation panel 198 includes a plurality of scale discs 200 to 218 having known electric control means and a control panel 198 according to the sewing conditions. changeover switch 220, 2 for selecting the sewing process according to the
22 are provided. The scale disc 200~
218 commands and controls the rotational positions of the motor shafts 72, 112, 122 of the stepping motors 70, 110, 120, which determine the respective feed amounts of the main feed 12, sub-feed 14, and upper feed 158 according to sewing conditions. It is for the purpose of That is, scale disk 2
00 is for commanding and controlling the rotational position of the motor shafts 72, 112, 122, and the scale disc 20
2, 204, 206 indicate the rotational position of the motor shaft 72; scale discs 208, 210, 212 indicate the rotational position of the motor shaft 112; scale discs 214, 216,
Reference numeral 218 is for commanding and controlling the rotational position of the motor shaft 122.

The operation of the sewing machine having the above configuration will be explained.

First, as shown in FIGS. 3 and 8, when sewing with the same ratio of the main feed 12, sub feed 14, and top feed 158, the sewing machine operator should mark the scale on the operation panel 198. When the disc 200 is adjusted to the desired stitch pitch, the stepping motor shafts 72, 112, 122, the worms 68, 88,
118, the rotational positions of the main adjustment shaft 62, the sub-adjustment shaft 102, and the upper feed adjustment shaft 114 change by the same angle through the worm wheels 66, 86, and 116, so that the upper feed 12, the sub-adjustment shaft 114, and the Feed 1
4. The upper feed 158 can feed the sewing material with the same feed amount.

Next, as shown in FIG. 4, when the upper fabric layer is geared against the lower fabric layer, when the sewing machine operator depresses the irregular stitch command pedal 84, the feed amount of the upper feed 158 changes to the main feed. 12,
The stepping motor 120 rotates so that the rotational position of the upper feed adjustment shaft 114 changes by a larger angle than the rotational positions of the main adjustment shaft 62 and the auxiliary adjustment shaft 102 so that the feed amount of the sub-feed 14 is increased. Therefore, the differential ratio of the irregular stitching process D shown in FIG. 8 can be obtained.

On the other hand, as shown in FIG. 5, when the lower fabric layer is geared against the upper fabric layer, the sewing machine operator switches to the irregular stitching process E side and depresses the irregular stitching command pedal 84. , the size of the feed amount of the sub feed 14 is the main feed 14,
Since the stepping motor 110 rotates so that the rotational position of the sub-adjustment shaft 102 changes by a larger angle than the rotational positions of the main adjustment shaft 62 and the upper-feed adjustment shaft 114 so that the feed amount of the upper feed 158 is increased. , the differential ratio of the irregular stitching process E shown in FIG. 8 can be obtained.

As shown in Figure 6, when performing stretch stitching when sewing knitted fabrics, etc., the operator presses the
98 changeover switch 220 is switched from the sewing process A/C side to the sewing process B side, and the scales of main feed 12, sub feed 14, and top feed 158 are adjusted to obtain the differential ratio of sewing process B shown in FIG. Discs 202, 208,
214, the stepping motor 7
0, 110, 120 are rotated and each adjustment shaft 62, 1
Since the rotational positions of 02 and 114 relatively change by a predetermined angle, the differential ratio shown in FIG. 8 can be obtained for each feed amount.

When the sewing machine operator touches the reverse stitch button 78 and presses the reverse stitch button 78, the reverse stitch switch 8
0 is ON, the fabric is reversely sewn as shown in Fig. 7 at the feed amount set on the scale disc 200 for main feed 12 on the operation panel 198 in accordance with the ratio shown in the reverse stitching process C in Fig. 8. can be sent. That is, stepping motors 70, 110, 12
0 is reversely rotated from each of the above states, and the main adjustment shaft 62,
The rotational positions of the sub-adjustment shaft 102 and the upper feed adjustment shaft 114 are rotated in the opposite rotational direction from the state of each sewing process, and take relatively the same rotational angular position, whereby the main feed 12 and the sub-feed 14 , top feed 158
performs reverse feeding motion of the fabric with the same feed amount.

As described above, according to the present invention, the main adjustment axis, sub-adjustment axis, and top feed adjustment axis that determine the feed amount during normal feed and reverse feed of main feed, sub-feed, and top feed are Since each axis is controlled separately by a stepping motor installed on each axis,
The structure and operation are simplified, and the range of adjustment conditions can be widened. Further, if the operation panel, reverse stitch button, and irregular stitch command pedal are arranged at appropriate locations convenient for the sewing machine operator to operate, the operation can be further facilitated. Furthermore, when the stepping motor and each adjustment shaft are interlocked, if a worm and a worm wheel are used so that the rotation can be transmitted only from the motor, the rotation and static position of each adjustment shaft can be reliably maintained during high-speed operation. In addition, even if the stepping motor is de-energized and its stationary holding torque is released after completing various sewing processes, each feed amount is maintained, so the sewing work can be started again.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a perspective view of the sewing machine head, FIG. 2 is a perspective view of the feed drive mechanism of the sewing machine, and FIGS. 6
7 and 7 are explanatory diagrams showing the operation under each sewing condition, FIG. 8 is a differential ratio diagram showing the feed amount ratio, and FIG. 9 is a perspective view of the operation panel. The same members in each figure are given the same reference numerals, 12 is the main feed, 14 is the sub feed, 62 is the main adjustment shaft, 70 is the stepping motor, 102 is the sub adjustment shaft, 110 is the stepping motor, and 114 is the upper Feed adjustment axis, 12
0 is a stepping motor, and 158 is an upward feed.

Claims (1)

[Claims] 1. A main feed, a sub feed, and an upper feed, three stepping motors that are provided corresponding to each of these feeds and drive these feeds separately, and these three stepping motors. A feed adjustment device comprising an operation panel for setting the rotation range of each motor, and a control means for controlling the three stepping motors and adjusting the feed amount based on the settings of the operation panel. sewing machine.