JPS631983Y2 - - Google Patents

Description

[Detailed description of the invention] Purpose of the invention (industrial application field) This invention aims to move the workpiece held by the workpiece holder on the throat plate in the lateral direction perpendicular to the vertical movement of the needle. This invention relates to a sewing machine that forms stitches at predetermined positions on a workpiece while applying a feeding motion to the sewing machine.

(Prior Art) In a conventional sewing machine of this type, for example, as shown in FIG. The workpiece W is clamped and held between them, and the feed mechanism sends the workpiece W through the feed plate 4 in the X and Y directions in a plane orthogonal to the vertical movement of the needle 6. A stitch is formed at a predetermined position on the workpiece W by the cooperation of the needle 6 and the thread loop catcher 7.

However, in this conventional configuration, the feed plate 4 of the sewing object holder 3 has a thickness of about 0.5 to 2 mm, and the feed plate 4 has an opening for needle drop formed in correspondence with the sewing pattern. The workpiece W is sewn inside the groove 4a.
A gap corresponding to the thickness of the feed plate 4 is created between the needle plate 2 and the needle plate 2. Therefore, when the needle 6 moves downward and penetrates the workpiece W as shown in FIG. 8b, the workpiece W is pushed by the needle 6 and bends downward, as shown in FIG. 8c. There was a risk that needle drift would occur, leading to problems such as needle breakage, skipped stitches, pattern distortion, and thread breakage.

In order to eliminate such problems, an opening 2a provided in the throat plate 2 as shown in FIGS. 9a and 9b.
A receiving member 8 having a supporting protrusion 8a and a needle hole 8b therein is disposed so as to be movable up and down, and when the needle 6 moves downward and penetrates the workpiece W, the receiving member 8 is raised and attached to the supporting protrusion 8a. to support the lower surface of the workpiece W,
Sewing machines have been proposed in the past that prevent the workpiece W from bending downward due to being pushed by the needle 6.

(Problem to be solved by the invention) However, in this conventional sewing machine, since the receiving member 8 is designed to move up and down at a fixed amount, it is difficult to move up and down as the workpiece W or the sewing program is changed. If the feed plate 4 of the sewing object holder 3 is replaced with one having a different thickness, the amount of elevation of the receiving member will no longer match the thickness of the feed plate 4. Therefore, if the feed plate 4 is so thick that the supporting protrusions 8a do not reach the lower surface of the workpiece W, the lower surface of the workpiece W cannot be accurately supported on the supporting protrusions 8a, and the The object W is pushed by the needle 6 and bent downward, causing needle drift, and the problems such as needle breakage as described above cannot be completely eliminated. Furthermore, if the feed plate 4 is thin and the supporting protrusions 8a push up the object W to be sewn, there is a risk that the feeding of the object W to be sewn may be hindered.

Structure of the Device (Means for Solving the Problems) This device was devised by paying attention to the problems mentioned above. a receiving member having a needle hole passing therethrough; and a receiving member that is linked with the vertical movement of the needle so that when the needle moves downward and penetrates the object to be sewn, the receiving member is raised to support the lower surface of the object to be sewn. The receiving member is provided with an elevating mechanism for elevating and lowering the receiving member, and an adjusting mechanism for adjusting the amount of elevating and lowering the receiving member by the elevating mechanism.

(Function) Therefore, in the sewing machine of this invention, even if the workpiece holder 15 is replaced with one of a different thickness due to changes in the workpiece W or the sewing program, etc.
By adjusting the elevating mechanism 30 using the adjusting mechanism 31, the setting of the elevating amount of the receiving member 25 can be easily changed, and the possibility that the workpiece W is bent downward due to being pushed by the needle 18 can be prevented. Needle breakage based on needle flow,
Problems such as skipped stitches, pattern distortion, and thread breakage can be reliably eliminated, and the workpiece W can be fed smoothly at all times.

(Embodiment) Hereinafter, an embodiment of a sewing machine embodying this invention will be described in detail with reference to FIGS. 1 to 7.

Now, as shown in FIGS. 1 and 2, the sewing machine frame 11 of this embodiment has a bed 12 and an arm 13.
An opening 14a is provided on the bed 12.
A throat plate 14 having a diameter is attached. A workpiece holder 15 consisting of a feed plate 16 and a presser plate 17 is movably arranged on the throat plate 14, and the feed plate 1
6 and the presser plate 17 are formed with opening grooves 16a and 17a for needle drops corresponding to a predetermined sewing pattern. The workpiece W is clamped and held between the feed plate 16 and the presser plate 17 of the workpiece holder 15, and the workpiece W is held by the feed plate 16 by a feed mechanism (not shown) based on a predetermined sewing program. direction and the Y direction. Further, a needle 18 is provided at the tip of the arm 13 so as to be movable up and down, and a thread loop catcher 19 provided within the bed 12
A stitch is formed at a predetermined position on the workpiece W by cooperation with the sewing machine.

As shown in FIGS. 1 to 3, a fixed shaft 20 is installed in the rear part of the bed 12 so as to extend horizontally to the right and left, and a rotating shaft 20 is installed in the front part of the bed 12.
1 is also rotatably supported so as to extend horizontally in the left and right direction. As shown in FIGS. 2 and 3, a support arm 22 is erected and fixed at the left end of the fixed shaft 20. At the upper end of the support arm 22, a feed bar 23 is rotatably supported at its rear end by a pin 24, and a forked portion 23a is formed at its front end. A receiving member 25 is provided on the upper surface of the feed bar 23 so that it can be raised and lowered within the opening 14a of the throat plate 14.
is attached, and a support protrusion 25a is formed protruding from the upper surface thereof, and a needle hole 25b for passing the needle is formed in the center of the support protrusion 25a.

As shown in FIGS. 2 and 3, a vertical feed arm 26 is fixed to the left end of the rotation shaft 21, and a square piece 27 that slidably engages with the bifurcated portion 23a of the feed base 23 is provided at the tip of the vertical feed arm 26. It is rotatably supported by a pin 28. As the rotation shaft 21 reciprocates, vertical reciprocation is applied to the feed table 23 via the vertical feed arm 26 and the square piece 27, and the receiving member 25 is moved up and down within the opening 14a of the throat plate 14. It is becoming more and more like this.

As shown in FIGS. 1 and 4, the sewing machine frame 1
A main shaft 29 extending horizontally in the left-right direction is rotatably supported within the arm 13 of the first arm 1. An elevating mechanism 30 for rotating and elevating the receiving member 25 in conjunction with the vertical movement of the needle 18 is provided, and the elevating mechanism 30
An adjustment mechanism 31 is provided for adjusting the amount of elevation of the receiving member 25. Based on the actions of both mechanisms 30 and 31, when the needle 18 moves downward and penetrates the workpiece W, the receiving member 25 corresponds to the thickness of the feed plate 16 in the workpiece holder 15. The supporting protrusion 25 is raised by the amount of elevation.
The lower surface of the workpiece W is supported on a.

Therefore, the construction of the elevating mechanism 30 and the adjusting mechanism 31 will be explained in detail. As shown in FIGS. 1 and 4, an eccentric cam 32 is provided on the main shaft 29.
A bifurcated first rotary lever 33 is rotatably supported on the right end of the fixed shaft 20 in correspondence with the eccentric cam 32, and one arm portion of the first rotary lever 33 is rotatably supported on the right end of the fixed shaft 20.
4a, a two-pronged rod 34 that engages with the eccentric cam 32 is rotatably supported by a stepped screw 35, and the other arm has a fitting hole 33a extending parallel to the axis of the fixed shaft 20 and a fitting hole 33a for fitting therein. Matching hole 3
A screw hole 33b is formed extending in a direction perpendicular to 3a. When the eccentric cam 32 is rotated, the two-pronged rod 34 is reciprocated about the stepped screw 35 due to its cam action.

As shown in FIGS. 1 and 4, below the main shaft 29, inside the arm 13 of the sewing machine frame 11,
The adjustment cam body 36 is rotatably supported by a support shaft 37 protruding from one side of its upper end via a bearing metal 38, and is normally rotated counterclockwise in FIG. 1 by the force of a spring (not shown). energized.
The upper front edge of the adjusting cam body 36 has an inclined cam surface 2.
6a is formed, and a bifurcated portion 36 is formed at the bottom.
b is provided, and a support pin 39 is provided on the other side of the lower part.
is installed protrudingly. A link body 40 is rotatably supported at its lower end by the support pin 39 on the adjustment cam body 36, and its upper end is rotatably connected to the upper end of the two-pronged rod 34 by a stepped screw 41. As the two-pronged rod 34 swings, the link body 40 is reciprocated about the support pin 39.

As shown in FIGS. 1 and 3, the first rotating lever 3
3, a rotating arm 4 is located at the right end of the rotating shaft 21.
2 is fixed, and a connecting rod 43 is attached between the tip of the lever and the other arm portion of the first rotating lever 33 by a stepped screw 44 and a connecting pin 45. In this embodiment, in particular, the connecting pin 45 on the side of the first rotating lever 33 is always inserted into the fitting hole 43a formed at the rear end of the connecting rod 43 and extending horizontally in the left-right direction. It is fitted into the fitting hole 33a on the movable lever 33 so as to be movable in the axial direction, and is fixed to prevent it from coming off by a fixing screw 46 screwed into the screw hole 33b on the first rotary lever 33. Therefore, when the two-pronged rod 34 is moved up and down, the first rotating lever 33 is rotated back and forth, and this is transmitted to the rotating shaft 21 via the connecting rod 43 and rotating arm 42, and the rotation thereof is As the shaft 21 rotates, the receiving member 25 shown in FIG. 2 is moved up and down as described above.

That is, as shown in FIG.
6 is rotated so that the adjustment cam body 36 is arranged almost vertically, and the support pin 3 which is the rotation center of the link body 40
9 deviates from the line connecting the stepped screw 41 and the stepped screw 35, when the two-pronged rod 34 is swung, the two-pronged rod 34 will be linked to the swing locus of the two-pronged rod 34 on the stepped screw 41. Since the rotation locus of the body 40 is different, vertical movement is imparted to the two-pronged rod 34. Further, as shown in FIG. 7, the adjusting cam body 36
As the support pin 39 rotates, the stepped screws 41, 3
Step screw 4 if placed on the line connecting 9
Swing locus of the two-pronged rod on 1 and link body 4
0, the two-pronged rod 34 hardly moves up and down, and the receiving member 25 does not move up and down. In the state shown in FIG. 7, the two-pronged rod 34 is moved up and down very slightly based on the difference between the swing radius of the two-pronged rod 34 and the rotation radius of the link body 40, but this can be ignored. It is of a certain degree.

As shown in FIG. 1, an adjustment operation body 47 that constitutes the adjustment mechanism 31 together with the adjustment cam body 36 is screwed to the front surface of the arm 13 of the sewing machine frame 11 so as to be adjustable and rotatable at a threaded portion 47a. An engaging portion 47b is formed in the engaging portion 47b to engage with the inclined cam surface 36a of the adjusting cam body 36 to position and hold the adjusting cam body 36 in a desired inclined state, thereby determining the position of the support pin 39. There is. Adjustment operation body 4
An operation dial 48 is fixed to the front end of the arm 13, and a scale (not shown) corresponding to the amount of elevation of the receiving member 25 is attached to the front surface of the dial 48, and a dial 48 that engages with a regulation pin 49 on the front surface of the arm 13 is attached to the rear surface of the dial 48. and a projection 4 for regulating the rotation range of the adjustment operation body 47.
8a is provided.

Then, by moving the adjustment operation body 47 forward and backward toward the adjustment cam body 36 by rotating the operation dial 48, the adjustment cam body 36 is moved forward and backward based on the engagement between the engagement portion 47b and the inclined cam surface 36a. The tilt state is changed.

As shown in FIGS. 1, 4, 5, and 6, the arm 1 of the sewing machine frame 11 is connected to the lifting mechanism 30.
3 is provided with a holding mechanism 50, and this holding mechanism 5
0, the action of the elevating mechanism 30 is nullified, and the receiving member 25 is held in the raised position or the lowered position.

Therefore, the structure of this holding mechanism 50 will be explained in detail. As is clear from FIGS. 1, 4, and 5, an operating shaft 5 extending horizontally in the left-right direction is provided in the arm 13 of the sewing machine frame 11 below the main shaft 29.
1 is rotatably supported. Its operating shaft 51
An operating lever 52 is fixed at the lower end to the left end of the lever, and the two-pronged portion 3 of the adjusting cam body 36 is attached to the upper end of the operating lever 52.
A pin 52a that engages with the pin 6b is provided in a protruding manner.
Further, an operating arm 53 is fixed to the right end of the operating shaft 51 on the outer surface of the arm 13 of the sewing machine frame 11.

As shown in FIG. 5, an air cylinder 54 is rotatably supported at its upper end by a support shaft 55 on the rear surface of the arm 13 of the sewing machine frame 11 in correspondence with the operating arm 53, and its piston rod 56
is extending downward. A two-arm lever 57 is rotatably supported at the center by a support shaft 58 on the right side surface of the arm 13, and the piston rod 56 is connected to one arm part by a pin 59, and the other arm part is connected to the piston rod 56 by a pin 59. The operating arm 53 is connected by a pin 61 via a connecting rod 60.

When the air cylinder 54 is actuated and the piston rod 56 is retracted upward, the two-arm lever 57 and the connecting rod 6
0, the operating lever 52 is rotated counterclockwise in FIGS. 1 and 5 via the operating arm 53 and the operating shaft 51,
Accordingly, the adjustment cam body 36 is rotated clockwise from the arbitrary adjustment tilted state in a direction in which the engagement between the inclined cam surface 36a and the adjustment operation body 47 is released, and is brought into a substantially vertical state as shown in FIG. Become. Therefore, when the air cylinder 54 is operated, the action of the elevating mechanism 30 is disabled, and the receiving member 25 is held in the lowered position with zero vertical amount.

Further, as shown in FIGS. 3, 4, and 6, a rotating arm 62 is fixed to the operating shaft 51 near the right side of the operating lever 52. The rotating arm 62
At the right end of the fixed shaft 20 adjacent to the first rotation lever 33 of the lifting mechanism 30, there is a first
A bifurcated second rotary lever 63 having the same shape as the rotary lever 33 is rotatably supported, and the rotary arm 62 is attached to one arm portion of the lever by a stepped screw 65 via a connecting rod 64. The other arm has a first rotating lever 33 and a connecting rod 4.
A fitting hole 6 that matches the fitting holes 33a and 43a on 3
3a and a screw hole 63b extending in a direction perpendicular to the fitting hole 63a.

Then, as shown by the chain line in FIGS. 3 and 6, the connecting pin 45 is moved out of the fitting hole 33a of the first rotating lever 33, and the connecting pin 45 is removed from the fitting hole 43a of the connecting rod 43. Second rotation lever 6
3 through the fitting hole 63a, and then tighten the fixing screw 4.
6 from the screw hole 33b on the first rotation lever 33 to the screw hole 3b on the second rotation lever 63 to prevent it from coming off. The power transmission path from the connecting rod 64 of the holding mechanism 50 to the second rotating lever 63 is cut off.
A power transmission path is formed through the connecting rod 43.

Therefore, in this state, when the air cylinder 54 is actuated and the piston rod 56 protrudes downward, the piston rod 56 is moved through the two-arm lever 57, the connecting rod 60, the actuating arm 53, the actuating shaft 51, the rotating arm 62, and the connecting rod 64. Acting on the second rotation lever 63,
The second rotating lever 63 is urged to rotate counterclockwise in FIG. 6, and the receiving member 25 is held in the raised position. Also, at this time, since the operating shaft 51 is linked to the adjusting cam body 36 via the operating lever 52, the raised position of the receiving member 25 is the same as when the lifting mechanism 30 is operated. It is set according to the inclination state of the adjustment cam body 36 based on the adjustment.

The operation of the sewing machine constructed as described above will now be described.

Now, in this sewing machine, normally the connecting pin 45 is attached to the fitting holes 33a, 43 of the first rotating lever 33 and the connecting rod 43, as shown by solid lines in FIGS.
The elevating mechanism 30 is in a state where it is inserted into the a side and the action of the elevating mechanism 30 is activated. Therefore, when the sewing machine is operated in this state, the eccentric cam 3
2, vertical movement is generated in the two-pronged rod 34, and as shown in FIG.
The receiving member 25 is moved up and down via the vertical feed arm 26 and the feed table 23 shown in the figure. And needle 1
8 moves down and the workpiece W on the workpiece holder 15
When the needle 18 and the thread loop catcher 19 work together, the receiving member 25 rises and the lower surface of the workpiece W is supported on the supporting protrusion 25a. Eyes are formed.

Furthermore, when the feed plate 16 of the workpiece holder 15 is replaced with one of a different thickness due to changes in the workpiece W or the sewing program, the operation dial 48 is adjusted based on the change in the thickness. When the adjustment operation body 47 is adjusted forward or backward by rotating the adjustment cam body 36
The tilt state of the receiving member 25 changes, and the amount of elevation of the receiving member 25 based on the rotation of the eccentric cam 32 can be easily changed. Therefore, the receiving member 25 is connected to the feed plate 1.
6, the lower surface of the workpiece W is reliably supported without being pushed up on the support protrusion 25a, and smooth feeding can be obtained. This prevents the sewing object W from being pushed by the needle 18 and bending downward, and sewing can be smoothly performed without causing needle drift or the like.

Furthermore, in cases where the sewing machine is brought to an emergency stop in the middle of sewing, the workpiece holder 15 is manually moved, and sewing is continued while partially omitting feeding of the workpiece W based on the sewing pattern. When the air cylinder 54 of the holding mechanism 50 is operated, the adjustment cam body 36 of the elevating mechanism 30 is moved through the operating shaft 51 etc. by the retracting operation of the piston rod 56.
is rotated to the substantially vertical position shown in FIG. 7, the action of the lifting mechanism 30 is disabled, and the receiving member 25 is held in the lowered position. Therefore, in this state, the workpiece holder 15 can be moved without interfering with the receiving member 25.
can be moved freely and placed in any position.

Further, without automatically transferring the workpiece W based on the sewing pattern, the workpiece holder 15 is moved between one side of the opening groove 16a on the feed plate 16 and the receiving member 25.
If you want to perform sewing while sequentially manually feeding the needle by a guiding action based on the engagement with the supporting protrusion 25a, or if you are sewing using a thin thread and the contact resistance between the thread and the supporting protrusion 8a is If the lever is small and sewing can be performed without any trouble without raising or lowering the receiving member 25, connect the connecting pin 45 to the second rotating lever 63 as shown by chain lines in FIGS. 3 and 6. Fitting holes 63a, 43 for rod 43
If it is inserted into the a side, the receiving member 2 is removed from the lifting mechanism 30.
The power transmission path leading to the holding mechanism 5 is cut off, and the holding mechanism 5
A power transmission path from 0 to the receiving member 25 is formed. Thereby, the receiving member 25 is held in the raised position based on the protrusion of the air cylinder 54 and the piston rod 56, so that the sewing described above can be easily performed.

It should be noted that this invention is not limited to the configuration of the above-mentioned embodiments, and it is also possible to embody the invention by changing the configuration of each part arbitrarily within a range that does not depart from the spirit of this invention.

Effects of the invention As detailed above, this invention allows the adjustment mechanism to maintain the lifting and lowering mechanism even when the workpiece holder is replaced with one of a different thickness due to changes in the workpiece or sewing program, etc. By adjusting the amount of elevation of the receiving member, the settings can be easily changed, preventing the sewing material from being pushed by the needle and bending downward, and preventing needle breakage, skipped stitches, and pattern distortion due to needle flow. It is possible to reliably eliminate problems such as thread breakage, and also has excellent effects in that the workpiece W can always be fed smoothly.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing in particular the elevating and lowering mechanism and adjustment mechanism of the receiving member in a sewing machine embodying this invention, Fig. 2 is a side sectional view similarly showing the supporting structure of the receiving member, and Fig. 3 is a portion of the sewing machine. 4 is a partial front sectional view of the sewing machine, FIG. 5 is a partial side view of the sewing machine, especially showing the holding mechanism, FIG. 6 is a partial side sectional view of the sewing machine, also showing the holding mechanism, and FIG. 1
A side sectional view of the sewing machine showing the operating state shown in Fig. 8a.
- Fig. 8c is a partial sectional view for explaining the needle flow phenomenon during sewing in a conventional sewing machine, and Figs. 9a and 9b are partial sectional views showing the lifting and lowering movement of the receiving member in the conventional sewing machine. be. In the figure, 11 is a sewing machine frame, 12 is a bed, 13 is an arm, 14 is a throat plate, 14a is an opening,
15 is a sewing object holder, 16 is a feed plate, 17 is a presser plate, 18 is a needle, 23 is a feed base, 25 is a receiving member, 25a is a supporting projection, 25b is a needle hole, 26 is a vertical feed arm, 30 31 is a lifting mechanism, 31 is an adjustment mechanism, 32 is an eccentric cam, 34 is a two-pronged rod, 36 is an adjustment cam body, and 47 is an adjustment operation body.

Claims (1)

[Claims for Utility Model Registration] While applying a horizontal feeding movement perpendicular to the vertical movement of the needle 18 to the sewing object W held by the sewing object holder 15 on the needle plate 14, In a sewing machine configured to form stitches at predetermined positions on a workpiece W, a receiving member 25 is disposed so as to be movable up and down within an opening 14a provided in the throat plate 14, and has a needle hole 25b through which the needle 18 passes. When the needle 18 moves downward and penetrates the object W to be sewn, the receiving member 25 is moved up and down to support the lower surface of the object W to be sewn, in conjunction with the vertical movement of the needle 18. Lifting mechanism 3 for lifting and lowering 25
1. A sewing machine characterized by comprising: a sewing machine having a lifting mechanism 30; and an adjusting mechanism 31 for adjusting the amount of lifting and lowering of the receiving member 25 by the lifting mechanism 30.