JPH0440636Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device for preventing lateral vibration of a feed table supported in a cantilevered manner by a horizontal shaft within a sewing machine frame.

[Prior art] Generally speaking, in the feed device of a sewing machine, the
As disclosed in Japanese Patent No. 3740, the feed table is supported in a cantilevered manner by a horizontal shaft disposed within the sewing machine frame, and the feed table is is configured to carry out a known feeding movement.

[Problems to be solved by the invention] However, due to the accuracy of the fit between the feed base and the horizontal shaft, the feed base may oscillate laterally during sewing machine operation, and this lateral vibration generates noise and causes the sewing machine to The machine frame itself may vibrate, causing problems with sewing.

Therefore, in order to prevent the feed table from swinging laterally, a method can be considered in which both sides of the free end of the feed table are guided and supported from the lateral direction, but a guide member for this guidance support is arranged in a narrow space inside the sewing machine bed. Therefore, it is difficult to arrange the guide member so as not to interfere with the moving member such as the looper.

[Purpose of the invention] The present invention was devised in view of the above-mentioned problems, and its purpose is to reduce the lateral vibration of a cantilever-supported feed plate using a simple structure without interfering with moving members. The object of the present invention is to provide a device that can prevent such problems.

[Means for Solving the Problems] In order to achieve the above object, the lateral vibration prevention device of the present invention is swingably supported by a horizontal shaft disposed within the sewing machine frame, and has a feed dog at the free end. a rotating body that rotates around a fixed axis parallel to the horizontal axis and is placed close to the feeding platform; In a sewing machine equipped with a connecting member that connects to the base, a circumferential groove is bored in the outer circumferential surface of the rotating body so as to be located in a plane orthogonal to the horizontal axis, and the sewing machine can be fitted into the circumferential groove. A prevention plate having an engaging portion is fixed to the feed base.

[Function] Due to the engagement between the engaging portion of the prevention plate and the circumferential groove of the rotating body, the free end of the feed table is held at a constant distance from the rotating body in the lateral direction, thereby preventing lateral runout of the feed table during operation of the sewing machine. is prevented. As a result, the feed table moves smoothly in a plane perpendicular to the horizontal axis, and vibrations of the entire sewing machine frame are reduced.

[Embodiment] An embodiment of the present invention will be described below with reference to drawings embodying the invention.

FIG. 1 is a plan view showing a feed mechanism of a differential feed sewing machine in which the lateral vibration prevention device of this embodiment is employed, and FIG. 2 is a front view of the feed mechanism. As shown in FIGS. 1 and 2, the main feed bar 10 has a main feed dog 12 mounted and supported on the upper surface of its right end, and its left end is rotated by a main swinging arm 14 via a connecting shaft 16 as a horizontal shaft. movably connected. The main swing arm 14 is
It is swingably attached to a fixed shaft 18 fixedly supported on the sewing machine frame, and a long groove 20 extending in the longitudinal direction is formed below the fixed shaft 18.

The drive shaft 22 is rotatably supported within the sewing machine frame and rotationally driven by a sewing machine motor (not shown). On the drive shaft 22, a rotating body 24 for forward/backward feeding is fixed, and a moving body 26 for vertical feeding is attached via an eccentric body (not shown). As shown in FIG. 2, the moving body 26 is connected at its lower end to the main feed table 10 via a shaft (not shown).With this configuration, the moving body 26 moves up and down as the drive shaft 22 rotates, and The vertical motion is applied to the main feed table 10 as a vertical feed motion. The main adjustment link 28 has one end rotatably attached to the side end of the rotating body 24 with a stepped screw 30 in a state eccentric to the rotation center of the rotating body 24, and the other end is attached to the side end of the rotating body 24 via a clamping device 40. It is connected to the swing arm 14. With this configuration, as the drive shaft 22 rotates, the main adjustment link 28 reciprocates in its longitudinal direction and imparts back-and-forth movement to the main feed base 10 via the main swing arm 14. The main swing arm 14 and the main adjustment link 28 constitute a connecting member that connects the main feed base 10 and the rotating body 24.

Next, the clamp device 40 will be described in detail with reference to FIG. 3. The clamping device 40 has a shaft 46 connected to the main adjustment lever 42 by a pin 44 and a clamping spring 48 . The axis 46 is
It is inserted into the through hole 36 of the bush 34 fitted into the fitting hole 32 at the other end of the adjustment link 28 and the long groove 20 of the main swing arm 14, and further penetrates the clamp spring 48. It protrudes upward in FIG. 3, and a stop pin 50 is fixed to the end of the shaft 46. In addition, the button 34 is
The main swing arm 14 and the main adjustment link 28 are integrally formed with a flange 34a located between them so that they do not come into contact with each other, and are made of a hardened metal bush. The main adjustment lever 42 has two engaging surfaces 42a and 42b that can be engaged with the washer 52, and the engaging surface 42a is formed at a position farther from the engaging surface 42b with respect to the arrangement position of the pin 44. As shown in FIG. 3, when the main adjustment lever 42 is operated in the tightened state in which the engaging surface 42a is engaged with the washer 52, the main swing arm 14 and the bush 34 are in the clamped state. Pressure is applied by spring action.
When the main adjustment lever 42 is rotated so that the engagement surface 42b engages with the washer 52, the spring action of the clamp spring 48 is released, and the main adjustment link 28 is moved into the long groove 20 of the main swing arm 14. The position can be changed along the line. Therefore, clamp spring 4
8, the operator can arbitrarily change the position of the main adjustment link 28 to adjust and set the amount of longitudinal feed of the main feed base 10.
For example, by locating the main adjustment link 28 on the free end side of the main swing arm 14, the amount of back-and-forth feed of the main feed base 10 can be reduced.

As shown in FIGS. 1 and 2, two guide rods 54 and 56 are fixed in parallel to the lower right end of the main feed table 10, and extend in the direction in which the workpiece cloth is fed, that is, in the front-rear direction. There is. The sub-feed table 60 on which the sub-feed dog 58 is mounted and supported is configured to be movable relative to the main feed table 10 by being fitted with both guide rods 54, 56. The sub-swinging arm 62 is swingably supported by a fixed shaft 64 fixedly supported on the sewing machine frame, and has a long groove 66 bored in its intermediate portion. The guide body 68 is connected to the shaft 64 similarly to the sub-swinging arm 62.
The upper end thereof is attached to the sub-swinging arm 62 by a screw 70, and has a guide groove (not shown) extending in the longitudinal direction. A shaft 72 perpendicular to the guide rods 54 and 56 is bored in the sub-feed table 60, and a square piece 74 that fits into the guide groove of the guide body 68 is rotatably attached to the shaft 72. ing. With this configuration, the sub-feed table 60 is given a forward and backward feeding motion according to the swinging of the sub-swinging arm 62 and the guide body 68, and is also allowed to move in the vertical direction relative to the guide body 68. There is. The sub adjustment link 76 has one end connected to the main swing arm 14 via the connection shaft 16 and the other end connected to the sub swing arm 62 via a clamp device 80.

The clamping device 80 has a similar configuration to the clamping device 40 as shown in FIG.
and a clamp spring 88. A bushing 102 similar to the bushing 34 is fitted into the fitting hole 100 at the other end of the sub-adjustment link 76, and the shaft 8
6 is inserted into the through hole 104 of the bush 102 and the long groove 66 of the auxiliary swing arm 62, and projects through the clamp spring 88, and has a stop pin 90 that presses the clamp spring 88 at its projecting end. It is fixed. The bush 102 has a flange 102a located between the sub-swing arm 62 and the sub-adjustment link 76.
It is also integrally formed with the sub-adjustment lever 8.
Similarly to the main adjustment lever 42, the lever 2 has two engaging surfaces 82a and 82b that can be engaged with the washer 106. As shown in Figures 1 and 2, the main feed table 1
0 and the sub-feed table 60 is a porous elastic body 120.
is interposed, and a guide rod 5 is located between the two.
4 and 56 are always covered.

To explain the device for preventing lateral vibration of the main feed table 10 and the sub-feed table 60, this lateral vibration prevention device has a prevention plate 110;
0 is fixed to the upper surface of the intermediate portion of the main feed table 10 with a screw 112, and a bent portion 114 as an engaging portion is formed at its free end. A circumferential groove 116 is bored in the outer peripheral surface of the rotating body 24 so as to be located in a plane orthogonal to the connecting shaft 16, and the bent portion 114 of the prevention plate 110 fits into the circumferential groove 116. ing.

Next, the operation of the lateral shake prevention device of this embodiment will be explained.

During operation of the sewing machine, the rotating body 24 rotates with the circumferential groove 116 located in a plane perpendicular to the connecting shaft 16, and the bending portion 114 of the prevention plate 110 and the circumferential groove 116 are connected to each other. Due to the fitting, the free end side of the main feed bar 10 is held at a constant distance from the circumferential groove 116 in the direction perpendicular to the direction of movement thereof,
Lateral vibration of the main feed base 10 is prevented or reduced.
On the other hand, guide rods 54 and 56 are attached to the free end of the main feed base 10.
The sub-feed table 60 attached via the auxiliary feed plate 60 is in a state where the amount of lateral vibration of the main feed plate 10 and the amount of lateral vibration of the sub-feed plate 60 itself due to the precision of fitting with the guide rods 54 and 56 are accumulated. Therefore, by preventing the main feed table 10 from wobbling sideways as described above, the side wobbling of the sub feed table 60 is reduced. Therefore, the lateral vibration prevention device of this embodiment is extremely effective in preventing lateral vibration of the feed tables 10, 60 in a differential feed sewing machine.

The present invention is not limited to the embodiments described above, and various changes can be made without departing from the spirit thereof.

For example, although the lateral vibration prevention device of this embodiment is employed in a differential feed sewing machine, it can also be employed in a normal sewing machine equipped with a single feed table.

Further, in this embodiment, the circumferential groove 116 is formed in the rotary body 24 for generating a forward feeding motion, but the circumferential groove 116 is bored in the rotating body 24 for generating a vertical feeding motion. may be set.

[Effects of the invention] As is clear from the detailed description above, the present invention has a method of drilling a circumferential groove in a rotating body that is rotationally driven in order to impart a feeding motion to a feed base that is cantilevered by a horizontal shaft. Since the engaging part of the prevention plate fixed to the feed plate is fitted into the circumferential groove, the free end of the feed plate is held at a constant distance from the rotating body, and the lateral vibration of the feed plate can be easily prevented. This can be prevented by changing the configuration. Moreover, it is only necessary to add a prevention plate to prevent the feed table from lateral vibration, and it is easy to arrange the feed table in a narrow space within the sewing machine bed without causing interference with moving members such as a looper.

[Brief explanation of the drawing]

The drawings show a differential feed sewing machine employing a lateral vibration prevention device according to an embodiment of the present invention, in which FIG. 1 is a plan view showing the sewing machine feed mechanism, FIG. 2 is a front view of the feed mechanism, Figure 3 shows arrow A shown in Figure 2.
Enlarged side view of the clamping device seen from the direction of
The figure is an enlarged cross-sectional view of the clamping device taken along line 4--4 in FIG. 2. 10...Main feed base, 12...Main feed dog, 14...
...Main swing arm, 16...Connection shaft, 24...Rotating body,
28... Main adjustment link, 110... Prevention plate, 11
4...Bending portion, 116...Circumferential groove.

Claims (1)

[Claims for Utility Model Registration] A feed table 10 that is swingably supported by a horizontal shaft 16 disposed within the sewing machine frame and has a feed dog 12 mounted and supported on its free end; A rotary body 24 that rotates around a fixed axis and is disposed close to the feed base 10, and connecting members 14, 28 that connect the rotary body 24 and the feed base 10 in order to impart a feeding motion to the feed base 10. In the sewing machine, a circumferential groove 116 is bored in the outer circumferential surface of the rotating body 24 so as to be located in a plane orthogonal to the horizontal axis 16, and an engagement that can fit into the circumferential groove 116 is provided. A device for preventing lateral vibration of a feed table, characterized in that a prevention plate 110 having a portion 114 is fixed to the feed table.