JPH07204374A - Chain stitching type sewing machine - Google Patents

Abstract

PURPOSE:To enable the setting of a button and an object to be sewn at a specified position accurately and quickly in a chain stitching type machine allowing button stitching. CONSTITUTION:The base end part of a keep lever 3 is pivoted on a machine frame 2 containing a looper 4 and a looper interlocking mechanism 5 rotatable vertically with a pivot pin 6 and a sewing needle 7 is mounted at the tip part of the keep lever 3 being extended onto the top surface of the machine frame 2. A cloth receiving plate 17 and a pressure plate 18 are fitted on the top surface of the machine frame 2 in such a manner as to oscillate to the left or right intermittently according to the depressing and the upward rotation of the keep lever 3. A bored button 15 and an object 16 to be sewn 16 are grasped with a pressure plate 18, so arranged that the base part side thereof is rotatable vertically on the surface side of the cloth receiving plate 17 and being energized downward with a first energizing spring 19. A crank body attached on the top surface side of the cloth receiving plate 17 is made to abut the undersurface of a recess of the pressure plate 18 with the rotation of a handle mounted on one side thereof to keep the pressure plate 18 rising.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a chain stitch type sewing machine capable of button sewing.

[0002]

2. Description of the Related Art Among the prior art sewing machines of a single-thread, chain stitch type, which are manually type and portable, it is possible to sew a button by using Japanese Patent Publication No. 4-35195.
There is one described in the publication. As far as is understood from the description and the description of the drawings, the manual sewing machine in this prior art is capable of vertically rotating the base end portion of the presser lever with respect to the machine frame incorporating the double-pointed looper and the looper interlocking mechanism. The presser lever is equipped with an urging spring so that the tip end side of the presser lever rises, and when the presser lever is rotated downward, the sewing needle attached to the tip end of the presser lever slides left and right on the upper surface of the machine frame. It is configured so that it can be inserted into each matching hole of the fastening carrier that is mounted so that it can fit in the upper and lower fastening plates of the upper and lower paired fastening plates. The sewing machine is made of a flexible material, and the sewing object is pressed and sandwiched between the pair of upper and lower fastening plates.

[0003]

However, in the above-mentioned prior art, at the time of the button sewing operation, the button is installed at a predetermined upper surface position of the object to be sewn such as cloth, and the button hole (sew hole) is formed. In order to set the position of the sewing needle to the needle drop position of the sewing needle, loosen the screw for attaching to the fastening carrier once, and set the flexible upper fastening plate against the elastic force of its own. Then, it is necessary to lift it so that there is a gap between it and the lower fastening plate, and to set the sewing object and the button in the predetermined position within the gap. Since it cannot be determined unless the sewing needle is lowered, there is a problem that it is extremely difficult to set the sewing needle at an accurate position.

The first aspect of the present invention is to solve this problem.
It is an object of the present invention to provide a chain stitch type sewing machine capable of accurately and quickly setting the positions of a sewing object and buttons to be sewn. Also, in this type of chain stitch sewing machine, when thread tightening is performed in the process of raising the presser lever during chain stitching work on buttonholes, the tension of the sewing thread inserted through the sewing needle that has come out upward from the buttonhole is If it is too strong or the sewing thread is thick, the sewing object or button may move laterally so that the hole of the button clamped between the cloth receiving plate and the pressing plate approaches the axis of the sewing needle, When the next sewing needle descends, the sewing needle may not enter the hole of the button, collide with the upper surface of the button, and break the needle tip.

Another object of the present invention is to provide a chain stitch type sewing machine capable of preventing lateral displacement movement of a sewn object or a button sandwiched between the cloth receiving plate and the pressing plate even in such a case. is there.

[0006]

In order to achieve the above object, the invention of claim 1 is a chain stitch type sewing machine for button sewing, wherein a cloth receiving plate that reciprocates left and right along the upper surface of the machine frame. The cloth receiving plate is arranged so that the base side of the cloth receiving plate is rotatably up and down, and the pressing plate urged downward holds the button with a hole and the sewing object. The expanding means is provided for maintaining the upward posture of the pressing plate with respect to the upper surface of the plate.

According to a second aspect of the present invention, in the chain stitch type sewing machine according to the first aspect, a through hole is formed in the pressing plate in a range including a needle passing position of a sewing needle passing through a button hole. The through-hole is formed so that the button-holding portion of the button-holding tool having a pair of protrusions that fit into the pair of left and right holes of the button fits, and the button hole and the needle drop position of the sewing needle match. The shape has been set.

According to a third aspect of the present invention, in the chain stitch sewing machine according to the first or second aspect, one or both of the upper surface of the cloth receiving plate and the contact portion of the button on the pressing plate are provided. The contact surface having a large friction coefficient is formed.

[0009]

[Embodiments] Next, embodiments embodying the present invention will be described. FIG. 1 shows a lower case 21 for covering a machine frame 2 in a button-stitchable chain stitch sewing machine 1 of the present invention.
FIG. 3 is a side view showing a state in which the presser lever 3 with the upper case 20 is opened. FIG. 3 shows a state in which the tip end side of the presser lever 3 is opened upward with respect to the machine frame 2 (however, the upper and lower cases 20 and 21 are removed). 4 is a side view of the state where the tip end side of the presser lever 3 is close to the machine frame 2 (however, the upper and lower cases 20 and 21 are removed).

As shown in FIG. 3, below the machine casing 2, there are provided a looper 4 and a looper interlocking mechanism 5 for rotating the looper 4 from side to side in a reciprocating manner. A mounting seat body 8a for the sewing needle 7 and a fastening screw portion 8b are provided on the upper surface of the tip end portion of the pressing lever 3 which is pivotally mounted so as to be vertically rotatable about the pivot pin 6. The thread 11 from the thread winding bobbin 10 which is loosely fitted to the central support shaft 9 protruding upward to the right end portion of the machine frame 2 is provided with a thread tension tray 12 (a screw shaft 12a on the lower surface side and an attached thread shaft 12a provided on the upper surface of the pressing lever 3). Spring 12b
Is attached through the hole 13) to the needle hole 14 of the sewing needle 7 through the hole 13.

A holding body for holding the button 15 having the holes 15a and 15b and the sewing object 16 as shown in FIG.
A cloth receiving plate 17 that is placed on the upper surface plate 2a of the machine frame 2 and can swing left and right around the central support shaft 9, and the cloth receiving plate 1
The bottom surface of the machine frame 2 is composed of a pressing plate 18 that is attached to the base end side of the cloth receiving plate 7 so as to be rotatable up and down, and is guided by left and right side flange portions 17a of the cloth receiving plate 17 so that the cloth receiving plate 17 cannot swing to the left and right. The bottom plate portion 2b fixed to the side, the other end of the first urging spring 19 having one end locked to the pressing plate 18 and the pressing plate 1
The button 15 inserted into the lower surface of the sewing machine 8 is firmly pressed against the sewing object 16.

Then, in order to easily set the sewing object 16 and the button 15 to the sewing position on the upper surface of the cloth receiving plate 17, the tip end side of the pressing plate 18 is expanded so as to maintain the upward open posture. Provide opening means. That is, the pressing plate 18
While forming an upward recess 22 in the middle of the longitudinal direction of
The crank body 23 axially supported by the left and right flange portions 17a, 17a of the cloth receiving plate 17 is exposed in the recess 22 (see FIGS. 4 and 9). When the handle 24 attached to one end of the crank body 23 is rotated upward as shown by the solid line in FIG. 1, the crank body 23 is rotated upward in the recess 22 and hits the lower surface of the recess 22. In contact with each other, the state in which the tip end side of the pressing plate 18 is opened by the dimension (H1) with respect to the upper surface of the cloth receiving plate 17 is maintained.

Further, in this state, the tip (bent portion) of the handle 24 with respect to the lower edge of the middle portion of the upper case 20 in the longitudinal direction.
Abutting against each other (see FIGS. 1 and 2), even if the upper case 20 is inadvertently pressed from above, the upper case 20 and thus the presser lever 3 are prevented from closing downward, and the sewing target 16 The setting work of the and buttons 15 can be safely executed.

Therefore, the upward rotation of the handle 24 can maintain a state in which the crank body 23 holds a large gap between the top end of the pressing plate 18 and the upper surface of the cloth receiving plate 17 even if the operator releases the hand. Then, the operator can insert the sewing object 16 such as a shirt and the button 15 into the gap with both hands, and the position of the sewing object 16 and the button 15 and the sewing needle 7 for the holes 15a and 15b of the button 15 can be used. When the handle 24 is tilted sideways with one hand while the sewing position is fixed, the regulation by the crank body 23 in the recess 22 can be released, so that the spring force of the first biasing spring 19 causes the upper surface of the button 15 to move. It is possible to secure a state in which the pressing plate 18 is pressed and the positional relationship between the button 15 and the sewn item 16 and the needle drop position of the sewing needle 7 with respect to the holes 15a and 15b of the button 15 are made accurate, and the operation is also performed. It is extremely easy to implement.

Next, a chain stitching mechanism by operating the presser lever 3 will be described. The chain stitching mechanism includes the looper 4, the looper interlocking mechanism 5, and a swinging mechanism 28 that swings a holding body including the cloth receiving plate 17 and the pressing plate 18 to the left and right. Looper interlocking mechanism 5 and swing mechanism 28
And are configured to operate in synchronization with the vertical swing of the actuating body 25 described later.

That is, the operating body 2 arranged below the machine casing 2
5 is for tightening screws 26a,
26 b, the other end of the second biasing spring 27 having one end locked to the base of the actuating body 25 is locked to one side of the bottom plate portion 2 b of the machine frame 2, and the free end side of the actuating body 25 ( The side closer to the looper 4) and the tip end side of the presser lever 3 (attachment side of the sewing needle 7) are always biased upward. The appropriate position of the actuating body 25 comes into contact with the lower surface of the upper surface plate 2a of the machine frame 2 to determine the upper limit position.

As shown in FIG. 5, the looper interlocking mechanism 5 includes a thread catching lever 29 arranged on the front side of the front plate 2c fixed to the lower surface of the machine frame 2, a guide block 30, and the guide block 30. And a looper 4 fixed via a mounting screw 31 and a drive pin at the tip of an operating body 25 for reciprocally rotating the looper 4 in synchronization with the vertical movement of the presser lever 3 and the vertical movement of the sewing needle 7. The yarn catching lever 29 and the guide block 30 are composed of 32 and the like, and the front plate portion 2 is configured such that both lower ends of the yarn catching lever 29 and the guide block 30 are reciprocally rotated left and right via the pivot pin 33.
It is pivotally supported by c. The drive pin 32 that fits in the vertical guide groove 34 formed in the front plate portion 2c is fitted in the cam groove 35 formed in the yarn catching lever 29 and the cam groove 36 that extends vertically in the guide block 30. To do.

As shown in FIGS. 3, 7 and 8, at the end of the downward rotation of the actuating member 25, the switch mechanism 40 is pushed by the abutting portion 2d of the machine frame 2 to move backward, and the one-way. The clutch 52 and the clutch 52 are attached to the vertically divided case 41, and the case 41 is fixed to the support plate portion 25a at a midway portion in the longitudinal direction of the actuating body 25 with bolts and nuts.

The switch mechanism 40 has the contact portion 2
A guide plate 54 with a long guide groove hole provided at the tip (upper end) of a hollow push button 53 that moves upward when pressed by d, and is fitted in a guide groove hole in the guide plate 54 and protrudes upward. And its upper end engages with the lower surface notch 56 of the drive gear 42.
And one-way clutch 5
Reference numeral 2 includes a ratchet wheel 58 and a stop leaf spring 59 formed on the upper side of the drive gear 42.

An eccentric cam 43 having a gear portion 60 formed on the lower portion thereof is rotatably erected on the support plate portion 25a via a spindle pin 61, and the gear portion 60 and the drive gear 42 mesh with each other. . At the end of the lowering stroke of the actuating body 25, the lower end of the push button 53 is pushed by the contact portion 2d, and the coil spring 57
The push button 53 linearly moves against the urging force of the case 41.
The driver 55 is forcibly rotated along the guide groove in the guide plate 54 as it retracts inward. This rotational force rotates the drive gear 42 by 90 degrees in one direction via the notch portion 56, and when the push button 53 projects downward in the upward stroke of the operating body 25, it reversely rotates due to the function of the one-way clutch 52. Movement is blocked. In this way, the eccentric cam 43 is moved in one direction by meshing with the drive gear 42 that intermittently rotates in a certain direction through the switch mechanism 40 and the one-way clutch 52 and the gear portion 60 makes a double rotation angle. It is configured to rotate by 180 degrees (see FIGS. 7 to 8).

The eccentric cam 43 extends upward, and the through hole 44 formed in the upper surface plate 2a of the machine frame 2 and the cloth receiving plate 1 are formed.
7 and the pressing plate 18 are inserted into the restriction holes 45 and 46 formed in the same plane shape (see FIGS. 9 to 12). With these configurations, the lower case 21 is used as a workbench (not shown).
Then, as described above, the handle 24 is lifted and rotated to open the pressing plate 18, the sewn object 16 is inserted between the cloth receiving plate 17, and then, as shown in FIG. The hole 1 of the button 15 is formed in the pair of left and right protrusions 48, 48 of the button holder 47.
5a and 15b are fitted, the protrusion 48 is directed downward, and the tip portion (button holding portion) of the button holder 47 is pressed.
When it is fitted into the through hole 49 on the front end side (see FIGS. 14 and 1).
5), one hole 15a of the button 15 is set so as to coincide with the needle drop position of the sewing needle 7.

In this case, the shape of the through hole 49 in plan view is made equal to the left-right width dimension L1 of the tip of the button holder 47, and the dimension L2 from the tip surface of the button holder 47 to the protrusion 48 is a needle hole. It is set to coincide with the needle drop position of the sewing needle 7 above 51. According to the investigation by the present inventor, the pair of left and right holes 15a, 1 of the currently commercially available button 15 is
The spacing of 5b ranges from the narrow one P1 (≈2.7 mm) to the wide one P2 (≈3.5 mm), and the diameter of each hole 15a, 15b is 1.4 mm to 2.1 mm.
It is about mm. Therefore, the left-right interval P3 of the pair of left and right protrusions 48, 48 in the button holder 47 is 3.8 mm, and the left-right interval P4 of the other pair of left and right protrusions 48, 48 is 4.2 mm. The diameter of the portion 48 is slightly smaller than that of the button hole and is set to 1.4 mm and 1.6 mm, respectively.

The left and right pair of protrusions 48, 48 are provided at the ends of the forked forks separated by the slit groove 47a, whereby the left and right pairs of the forked forks are pinched by the fingers. Protrusions 48, 48
The left and right button holes 15a
After inserting the protrusions 48, 48 into 15b, when the finger is released from the bifurcated fork, the elastic force exerts the left and right protrusions 48, 4
Left and right button holes 15 on the button 15 on the outer surface of 8
The button 15 can be held so as not to fall by pulling it on the wide side of the cylindrical side surfaces of a and 15b.

When the handle 24 is tilted again with the tip of the button holder 47 holding the button 15 inserted in the through hole 49 of the pressing plate 18, the spring force of the first biasing spring 19 causes The sewing object 16 and the button 15 are integrally clamped, and the button hole is set so as to coincide with the needle drop position of the sewing needle 7 (see FIGS. 14 and 15). Next, when only the button holder 4 is removed and the pressing lever 3 (upper case 20) is rotated downward against the force of the second biasing spring 27 (see the state of FIG. 4), the sewing needle 7 causes the cloth receiving plate 17 to move. Also, depending on the descending and ascending movement of the drive pin 32, the sewing needle 7 is inserted into the gap between the guide block 30 and the looper 4 through the needle holes 50 and 51 in the top plate 2a of the machine frame.
The thread 11 on the button 15 is the one hole 1 on the button 15.
The looper 4 and the thread catching lever 29 cooperate with each other to perform chain stitching at a back surface portion of the workpiece 16 below 5a.

On the other hand, the downward rotation of the actuating body 25 causes the switch mechanism 40 to come into contact with the contact portion 2d to operate, the eccentric cam 43 rotates 180 degrees, and the protruding portion 43a thereof has the restricting holes 45 and 46. The vehicle is stopped in a posture such that it faces one of the narrow width directions in (1) (see FIG. 11). In this state, when the downward pressing force on the presser lever 3 (upper case 20) is released, the sewing needle 7 is pulled out upward from the one button hole 15a, and at the same time, the force of the second biasing spring 27 causes the presser lever 3 to operate. The body 25 rotates upward about the pivot pin 6 (see the state of FIG. 3).

Therefore, since the protruding portion 43a of the eccentric cam 43 on the actuating body 25 abuts against one of the narrow widths of the restriction holes 45 and 46 (see FIG. 12), the upper side of the other hole 15b of the button 15 is prevented. Since the cloth receiving plate 17 is rotated so that the sewing needle 7 is positioned at the same position, the sewing work 16 below the other hole 15b of the button 15 can be performed by one reciprocating rotation of the pressing lever 3 downward and upward. Chain stitch on the back side is executed. At the end of the downward rotation of the actuating body 25, the projecting portion 43a of the eccentric cam 43 is in the opposite direction by 180 degrees, and when the pressing force on the presser lever 3 is released in this state, the sewing needle is above the one hole 15a of the button 15. Cloth support plate 1 so that 7 is positioned
The cycle of rotating 7 is repeated.

As described above, the cloth receiving plate 17 is intermittently rotated right and left about the central support shaft 9 and the cooperation of the looper 4 and the thread catching lever 29 allows the sewing needle 7 to move.
Is alternately passed through the left and right button holes 15a and 15b of the button 15, and button sewing can be performed by a chain stitching method using the single thread 11. When performing thread tightening in the lifting step of the presser lever 3 during chain stitching work for buttonholes, the tension of the sewing thread 11 inserted into the sewing needle 7 that has pulled out upward from the holes 15a and 15b of the button 15 is too strong. In the case or because the sewing thread 11 is thick, the holes 15a and 15b of the button 15 sandwiched between the cloth receiving plate 17 and the pressing plate 18 are formed.
16 and button 15 so that the
May move in the lateral direction (width direction of the pressing plate 18), the next time the sewing needle 7 descends, the sewing needle 7 does not enter the hole of the button 15, collides with the upper surface of the button, and breaks the needle tip. There can be an accident.

Therefore, in this embodiment, although not shown, a contact surface having a large friction coefficient is provided on the upper surface of the cloth receiving plate 17 with which the lower surface of the sewn object 16 abuts and the lower surface of the pressing plate 18 with which the upper surface of the button 15 abuts. It is preferably formed so as to prevent lateral displacement movement of the button 15 and the sewing object 16. As a contact surface having a large friction coefficient, a rubber film or the like having a large friction coefficient, such as a non-slip rubber film, is attached to the lower surface of the pressing plate 18 and the upper surface of the cloth receiving plate 17, and short hairs (cut short fibers) are fixed. A so-called flocked surface to be fixed (adhered) by an electric coating method is formed, the lower surface of the metal pressing plate 18, the cloth receiving plate 17
It is sufficient to form a saw-toothed surface or a concave-convex groove surface on the upper surface of the disk by knurling. The contact surface having the large friction coefficient may be only one of the pressing plate 18 and the cloth receiving plate 17.

Next, the upper case 20 and the lower case 21.
To further explain the structure of the above, first, the upper case 20
As shown in FIGS. 1 and 2, the downward opening is formed so as to cover the upper surface of the presser lever 3, and on the inner surface side of the upper case 20, there are ribs 90 that come into contact with the upper surface of the presser lever 3 at a plurality of points. Has been formed. Then, as shown in FIGS. 16 and 17, a recess 91 is formed in a portion of the upper case 20 on the upper right side. Inside the recess 91, there is a slide type gripping piece 9.
2 is provided, and the locking piece 93 at the lower end thereof is a small-diameter hole among the locking holes 94 in a plan view in which a large-diameter hole and a small-diameter hole formed on the upper surface of the presser lever 3 shown in FIG. The upper case 20 cannot be pulled out from the presser lever 3 when the lock piece 93 is positioned in the large diameter hole.
Can be removed from the presser lever 3.

The recess 91 is formed so that the button holder 47 can be detachably accommodated therein.
Next, the configuration of the lower case 21 will be described with reference to FIGS. 3, 4 and 18. A lateral slide type knob 95 is provided on one side surface of the machine frame 2, and a protrusion of the knob 95 is provided. Is exposed on one side surface of the lower case 21, and a lock piece 96 having a U-shaped cross section as shown in FIGS. 4 and 9 is attached to the inner surface of the knob piece 95. On the other hand, a locking piece 97 that extends downward to the lower inner side surface of the machine frame 2 is provided at a middle portion in the longitudinal direction of the presser lever 3, and the tip end side of the presser lever 3 is pressed so as to approach the upper surface of the machine frame 2. When the knob piece 95 is slid laterally in this state, the lock piece 96 moves in the direction of the alternate long and short dash line in FIG.
7a, the pressing lever 3 can be held so as not to rotate upward, and when the knob piece 95 is slid in the opposite direction, the lock piece 96 is positioned in the solid line state in FIG. The lock piece 96 is disengaged from the notch 97a, and the tip end side of the presser lever 3 is rotated upward so as to be separated from the upper surface of the machine frame 2.

With such a lock mechanism, the presser lever 3
Since the front end side of the machine frame 2 is held close to the upper surface of the machine frame 2, the upper case 20 and the lower case 2 on the machine frame 2 side to be attached thereto are held.
As a result, this type of chain stitch sewing machine becomes compact and compact. Therefore, it is not bulky to carry this chain stitch sewing machine for traveling. Further, since the needle tip of the sewing needle 7 on the presser lever 3 is stored under the machine frame 2, it is said that the needle tip of the sewing needle 7 does not damage a human finger or the like during handling (carrying). Produce an effect.
In addition, the lock piece 96 in the lock mechanism is pressed against the lever 3
It may be configured to engage and disengage with a locking portion (not shown) formed in a notch on the base end side (mounting side of the pivot pin 6).

A bottom case 98 for accommodating small items as shown in FIGS. 1 and 18 is mounted on the lower surface of the lower case 21 so as to be horizontally rotatable via a vertical axis 99. The sewing needle 7, the threader 100, the bobbin 10 and the like can be stored. As a result, even if a button such as a shirt comes off during travel, the necessary small articles can be taken out immediately, which makes it very convenient to attach the button quickly.

In addition, one side of the bottom case 98 is attached to the lower case 2
By making it high so as to contact one side surface of 1,
It is possible to prevent the bottom case 98 from rotating carelessly. Although not shown, elastic dowels are provided on the confronting surfaces of the bottom case 98 and the lower case 21 so that the bottom case 98 can be connected to the lower case 2.
Therefore, it is possible to prevent the unintentional free rotation by holding it in the state along the longitudinal direction.

By using the chain stitch type sewing machine of the present invention and binding one end of a plurality of sheets of paper or newspaper with the thread 11, it is possible to substitute for a metal stapler.

[0035]

As described above, claim 1
Of the invention, in a chain stitch sewing machine for button sewing, a cloth receiving plate that reciprocates left and right along the upper surface of the machine frame,
The upper surface of the cloth receiving plate is arranged so as to be rotatable up and down, and the pressing plate urged downward holds the button with a hole and the object to be sewn. Since the expanding means for maintaining the upward posture of the pressing plate with respect to the upper surface is provided, when the expanding plate is operated to hold the pressing plate in the raised position, the pressing plate is manually operated. There is no need to hold it, and the operator can use both hands to insert the sewing object and the button into the gap between the cloth receiving plate, so the sewing position of the sewing object and the button can be set accurately, and the needle drop of the sewing needle is possible. It is extremely easy to set the position of the button hole with respect to the position. Then, when the position setting is completed, the expanding means is operated again to urge the pressing plate downward, so that the object to be sewn and the button are sandwiched between the cloth receiving plate and the pressing plate.
The effect is that the preparation work for button sewing becomes extremely easy.

According to a second aspect of the present invention, in the chain stitch type sewing machine according to the first aspect, the pressing plate has a through hole in a range including a needle passing position of a sewing needle passing through a button hole. The through-hole is formed so that the button-holding portion of the button-holding tool having a pair of protrusions that fit into the pair of left and right holes of the button fits, and the button hole and the needle drop position of the sewing needle match. The shape has been set.

Therefore, the position of the button hole can be aligned with the needle drop position of the sewing needle simply by holding the button in the button holder and fitting the button into the through hole of the pressing plate. , It is possible to save the trouble of setting the button and then bringing the needle tip of the sewing needle closer to the button hole to check it, and set the position of the sewing object and the button to be sewn accurately and quickly. Therefore, the button sewing preparation work can be performed extremely easily.

Furthermore, the invention of claim 3 is the chain stitch type sewing machine according to claim 1 or 2, wherein one or both of the upper surface of the cloth receiving plate and the contact portion of the button on the pressing plate are provided. Since the contact surface having a large friction coefficient is formed, when the cloth receiving plate and the pressing plate integrally swing left and right so that the sewing needle passes through the button hole, they are sandwiched between the two. The object to be sewn and the button can be reciprocally moved to the left and right by the same size without lateral displacement, and it is possible to prevent the needle tip of the sewing needle from colliding with the upper surface of the button and being broken.

[Brief description of drawings]

FIG. 1 is a side view of a chain stitch type sewing machine with an upper case opened.

FIG. 2 is a front view of a chain stitch sewing machine.

FIG. 3 is a side view of a main part with a presser lever opened.

FIG. 4 is a side view of a main part with a presser lever closed.

FIG. 5 is a perspective view of each part of the looper and the looper interlocking mechanism.

FIG. 6 is a perspective view of a main part of an eccentric cam and a pressing plate.

FIG. 7 is a partially cutaway plan view of a switch mechanism and an eccentric cam.

8 is a sectional view taken along the line VIII-VIII of FIG.

FIG. 9 is a plan view showing a state in which an upper case and a pressing lever are removed.

FIG. 10 is a plan view showing a laterally swinging state of a cloth receiving plate and the like.

11 is a sectional view taken along the line XI-XI of FIG.

FIG. 12 is an explanatory diagram showing a state where an eccentric cam is raised.

FIG. 13 is a perspective view of a button holder and a button.

FIG. 14 is a cross-sectional view showing a button mounting state by a button holder.

15 is a cross-sectional view taken along the line XV-XV of FIG.

FIG. 16 is a plan view of an upper case.

17 is a cross-sectional view taken along the line XVII-XVII of FIG.

FIG. 18 is a plan view showing a state in which the bottom case is rotated with respect to the lower case.

[Explanation of symbols]

 1 Chainstitch type sewing machine 2 Machine frame 3 Presser lever 4 Looper 5 Looper interlocking mechanism 6 Pivot pin 7 Sewing needle 15 Button 15a, 15b Button hole 16 Workpiece 17 Cloth support plate 18 Press plate 19 First biasing spring 20 Upper case 21 Lower Case 22 Recess 23 Crank Body 24 Handle 27 Second Energizing Spring 43 Eccentric Cam 47 Button Holder 48 Projection 49 Through Hole 50, 51 Needle Hole

Claims (3)

[Claims] 1. A chain stitch type sewing machine for button sewing, wherein a cloth receiving plate that reciprocates left and right along an upper surface of a machine frame, and a base side of the upper surface of the cloth receiving plate can be rotated up and down. An expanding means for holding the button with a hole and the object to be sewn by a pressing plate that is arranged and urged downward and holds the pressing plate upward with respect to the upper surface of the cloth receiving plate. A chain stitch sewing machine characterized by being provided with. 2. A through hole is formed in the pressing plate in a range including a needle passing position of a sewing needle passing through a button hole,
The through hole has a shape such that the button holding portion of the button holder having a pair of protrusions that fit in a pair of left and right holes of the button fits and the button hole and the needle drop position of the sewing needle match. The chain stitch type sewing machine according to claim 1, wherein the sewing machine is set. 3. The contact surface having a large friction coefficient is formed on one or both of the upper surface of the cloth receiving plate and the contact portion of the button on the pressing plate, according to claim 1 or 2. The chain stitch sewing machine described.