JPS6030235B2 - Sewing machine with built-in fabric edge cutting device - Google Patents

Description

[Detailed Description of the Invention] This invention has a built-in cloth edge cutting device for automatically cutting the edges of the workpiece cloth before the hem stitching of the workpiece cloth sent to the sewing position on the sewing machine bed. It is related to sewing machines.

The object of the present invention is to provide at least a use position where the movable blade is exposed above the sewing machine belt and can cut the edge of the work cloth in cooperation with the fixed blade, and a storage position where the movable blade is located below the sewing machine bed surface. A fabric edge cutting device is built into the sewing machine bed so that the sewing machine bed can be reciprocated. No motion is transmitted to the movable blade relative to the small diameter portion, and when the movable blade moves to the use position, the forked arms are automatically engaged with the actuating cam portion from the small flanges of the actuating cam through the inclined portions. By configuring the movable blade and the movement mechanism of the sewing machine to be connected, although the configuration of the connection mechanism is simple, it is possible to simply move the fabric edge cutting device to the use position or storage position. An object of the present invention is to provide a sewing machine incorporating a novel fabric edge cutting device that can automatically separate the connection between a movable blade and a movement mechanism of the sewing machine without requiring any other adjustment operations.

Hereinafter, one embodiment of the present invention will be constructed according to the drawings.
In the drawings, reference numeral 1 denotes a sewing machine arm, and as shown in FIG. 1, a sewing machine needle 2 and a presser foot 3 are attached to a needle bar and a presser foot bar attached to the head end of the arm.

Reference numeral 4 denotes a sewing machine bed, on the upper surface of which a top plate 5 is fixed, and on the left side of the front surface a hook lid 6 is attached so as to be rotatable in opening and closing.

Reference numeral 7 denotes a needle plate fixed near the front end of the upper surface of the upper plate 5 so as to cooperate with the upper plate 5 to form a workpiece support surface, and as shown in FIG. Here, a needle hole 7a for the general zigzag pattern and a closing opening 7b for the feed dog 8 are formed, and an opening □c for the cloth edge cutting device is formed on the right side.

Reference numeral 9 denotes a hook plate that is attached to the opening □ 7c of the throat plate 7 when using the cloth edge cutting device, and is attached to the opening □ 7c adjacent to the cloth feeding side of the feed dog 8 as shown by the chain line in FIG. It covers most of the closing opening 7c, leaving only the front left end slightly. During normal sewing work without using the fabric edge cutting device, the diamond plate 9 is removed and a separate cover plate 9A that can cover the entire Sekiguchi 7c of the throat plate 7 is attached as shown in FIG. It has become. 10' so as to extend in a direction perpendicular to the cloth feeding direction of the feed dog 8;
A hook drive shaft in the movement mechanism of the sewing machine rotatably supported in the sewing machine bed 4, which is rotated in conjunction with a main shaft (not shown) of the sewing machine, and a second rotary hook drive shaft.
As shown in the figure, a drive bevel gear 11 is fixed to its left end.

Reference numeral 12 denotes a rotation shaft rotatably supported within the sewing machine bed 4 so as to extend along the cloth feeding direction of the feed dog 8, and a drive bevel gear 11 on the hook drive shaft 10 is attached to the rear end thereof.
A helical bevel gear 13 that meshes with the sewing machine needle 2 is fixed thereto, and a shark hook 14 is attached to the front end of the hook 14 for sewing work cloth in cooperation with the sewing machine needle 2.
is installed.

Next, the sewing machine bed 4 is placed in a use position in which only a portion of the sewing machine bed 4 is exposed through the closing opening 7c of the throat plate 7 on the upper surface of the sewing machine bed 4;
The structure of the fabric edge cutting device built into the sewing machine bed 4 will be described so that it can be stored in a storage position located below the top surface of the sewing machine bed 4.

Reference numeral 15 denotes a support member in a support mechanism rotatably attached to the inner bottom of the sewing machine bed 4 at its lower end by a support shaft 16 extending parallel to the cloth feeding direction of the feed dog 8;
7 is wound around the support shaft 16 and attached to the sewing machine bed 4 at both ends.
The springs are fixed to the inner bottom portion of the support body 15 and the support body 15, respectively, and urge the support body 15 to rotate in the counterclockwise direction in FIG.

Reference numeral 18 denotes a holder rotatably supported at the upper end of the support body 5 by a support shaft 19 at its right end, and as the support body 15 rotates, the feed dog 8 is rotated in the sewing machine bed 4. It is designed to be able to move in a plane substantially perpendicular to the cloth feeding direction.

The support body 15 is wound around the support shaft 19 at both ends.
and springs respectively latched to the holders 18, which urge the holders to rotate clockwise in FIG.

The 2 tatami mat is a guide body having a substantially U-shaped side surface as a guide means fixed to the inner bottom of the sewing machine bed 4 by a mounting screw 22 below the holder wealth 8, and as shown in FIGS. 3 and 5. As is clear, the rear upright piece is formed with a guide groove 23 that includes a horizontally extending movement guide part 23a and an elevation guide part 23b that slopes downward to the right from the right end of the movement guide part 23a.

Numeral 24 is a mari pin installed between the lower protruding pieces of the holder 18 so as to be fitted into the guide groove 23, and cooperates with the guide groove 23 to guide the movement of the holder 18 and to control the movement thereof. With the mari pin 24 engaged with the left end of the guide groove 23, the holder 8 is moved to the left side where only a part of its left upper surface is exposed on the sewing machine bed surface, as shown in FIG. Place it in the upper usage position,
When the rutting pins 24 are engaged with the lower right end of the guide groove 23, the holder 18 is placed in a storage position on the lower right side below the surface of the sewing machine bed, as shown in FIG.

Reference numeral 25 denotes a locking member in a locking mechanism which is rotatably mounted on the holder 18' via a spring washer 26 so as to be located above the guide member 21, and is shown in FIGS.
As shown in the figure, an operating knob 27 is housed in a recess on the holder 18 and has a pair of recesses 27a on the top surface for finger rests.
It is screwed into a screw hole formed in the holder 18 so as to be rotatable and movable up and down, and has a threaded groove 28 at its lower end that can be mated with the upper end green of the rear upright piece of the guide body 21. .

Then, as shown in FIGS. 3 and 5, the holder 18
By rotating the locking body 26 in the state in which the screw has been moved to the use position, the lower end of the screw punch 28 engages with the pressure bush of the rear side upright piece of the guide body 21, and the guide The width of the groove 23 at the movement guide portion 23a is reduced, and the shaft pin 24
The guiding action of the guide groove 23 is temporarily blocked, and the holder 18 can be locked in the use position so that it cannot move. Reference numeral 29 denotes a pair of support pins 30' provided in a protruding manner on the rear surface of the front upright piece of the guide body 21.
9a is a free iron and is supported on the guide member body 21 so as to be movable laterally, and as shown in FIGS. Rut pin 2 in groove 23
A locking piece 29b that can be engaged with the front end of the handle 4 is provided protrudingly, and an operating piece 29c is bent forward on the left side.

Reference numeral 31 denotes a spring suspended between the hooking part body 29 and the guide part body 21, and urges the cocking part body 29 to move toward the right.

Then, due to the guiding action of the guide groove 23, the holder 18
When the front end of the shaft pin 24 is moved from the use position shown in FIG. 3 to the storage position shown in FIG.
The guide groove 2 is engaged with the arcuate portion of the upper surface of b, and the latching member 29 is moved to the left against the action of the spring 31.
3, the latching member 29 moves back to its original position as shown in FIG. 18 is held at the storage position so as not to be able to move freely. Reference numeral 32 denotes a fixed blade having a substantially L-shaped front face fixed to the upper surface of the left end of the holder 18, and the holder 18 is moved to the use position as shown in FIGS. 2, 3, and 6. At this time, the blade portion of the fixed blade 32 is located on the same plane as the upper surface of the throat plate 7 and close to the needle hole 7a on the cloth feeding side.

33 is a working koji rotatably supported by the rear end bearing portion of the holder 18 so as to extend in a direction perpendicular to the cloth feeding direction, and 34 is fixed to the left side of the working shaft 33. The drive arm extends toward the upper front as shown in FIGS. 2 and 6.

A movable blade 35 is fixed to the front end of the drive arm 34, and a blade portion and a guide protrusion 36a are formed at the lower end of the movable blade.
When the holder 18 is moved to the use position as shown in FIGS. 3 and 6, only the front end of the drive arm 34 including the movable blade 35 passes through the opening □ 7c of the throat plate 7 to the sewing machine bed 4. A movable blade 35 protrudes from the upper surface and cooperates with the fixed blade 32 as the operating shaft 33 reciprocates to cut the edge of the work cloth being transferred in the cloth feeding direction prior to overcasting. It has become.

36 is a spring receiver 37 on the operating shaft 33 and a holder 18;
The spring is interposed between the movable blade 35 and the fixed blade 32 and urges the operating shaft 33 to move leftward, thereby constantly pressing the movable blade 35 toward the fixed blade 32.

Reference numeral 38 denotes a movement regulating pin that is movably protruded and fixed to the left side of the holder 18 so as to come into contact with the right side of the drive arm 34, and is movable with respect to the movable blade 35 when cutting thick work cloth. Even if a rightward movement force is applied to move away from the fixed blade 32, the drive arm 34 is restricted from moving in the same direction, allowing the cutting operation to be performed smoothly.

Reference numeral 39 denotes a thin cloth handling piece attached to the upper surface of the left end of the holder 18 so as to be adjacent to the cutting operation section consisting of the fixed blade 32 and the movable blade 35, and is shown in FIGS. 2 and 3. A standing portion 39a is formed as shown in FIG.
8 is moved to the use position, the cloth handling piece 39 is exposed to the upper surface of the sewing machine bed 4 through the opening 7c of the throat plate 7 together with the movable blade 35 and the front end of the drive arm 34, and the The cloth scraps cut in the cutting operation section are guided to the right rear side along the upright portion 39a of the cloth scattering piece 39, and are quickly discharged from the cutting operation section on the upper surfaces of the lid plate 9 and throat plate 7. It has become. 4 rivers holder 1
In order to reciprocate the movable blade 35 in conjunction with the motion mechanism of the sewing machine when the movable blade 8 is moved to the use position, the bifurcated arm 41 of the operating mechanism is fixed to the right end of the operating shaft 34. An operating cam fixed to the hook drive shaft in the sewing machine bed 4 at the rear of the forked arm 40,
As is clear from FIG. 2, FIG. 6, FIG. 7, and FIG. 8, in the use position of the holder 18, the two-pronged arm 40 is iron-coupled and the large-diameter deflection 'D' that moves the two-pronged arm 40 is formed. a small-diameter portion 41b that faces the two-pronged arm 40 without movement in the storage position of the holder 18; and an inclined portion 41c that connects the raised portion 41b and the operating cam portion 41a. are formed, and each of these parts 41a,
41b and 41c are surfaces 4 having the same radius from the axis ○ of the hook driving shaft 10 at a predetermined common angular position.
I have 1d.

In this embodiment, a needle positioning layer stop device (
(not shown) is built into the sewing machine, and when the sewing machine is stopped, the operating cam 41 engages with one engaging piece of the bifurcated arm 40 at its surface 41d having the same radius as shown in FIG. It is designed to be stopped in this state.

Therefore, if the holder 18 is moved from the use position to the storage position in this stopped state, the forked arms 4 and 4, which are drumming against the operating cam portion 41a of the operating cam 41, as shown in FIG. One of the engaging pieces is smoothly moved rightward along the surface 4d having the same radius on the operating cam 41, and faces the small diameter portion 41b of the operating cam 41 as shown in FIG. When the holder 18 is moved from the storage position to the use position, the two forked arms facing the small diameter portion 41b of the operating cam 41 have the same radius as the engagement piece on one of them. It is smoothly moved to the left by the sliding engagement with the surface 41d having the above-mentioned surface 41d, and the other engaging piece rides on the operating cam portion 41a along the inclined portion 41c of the operating cam 41 on the opposite side to the surface 41d. , as shown in FIG. 7, is automatically engaged with the operating cam portion 41a. The following operation of the sewing machine incorporating the fabric edge cutting device configured as described above will be explained.

Now, in FIG. 4, the holder 18 is moved to the storage position in the sewing machine bed 4, and the cover plate 9A is used to close the upper surface of the needle plate 7.
This shows the state in which the entire area c is covered.

In this state, the mari pin 24 at the lower part of the holder 18 moves within the guide groove 23 of the guide body 21 in the elevation guide section 23b.
The front end of the mouse pin 24 is engaged with the lower surface of the locking piece 29b of the locking member 29, so that the holder 18 resists the action of the springs 17 and 20 in the support mechanism. It is latched and held in the storage position so that it cannot move freely.
In addition, in the retracted position of the holder 18, as shown in FIG. 8, the two-pronged arm 40 of the actuating mechanism faces the small diameter portion 41b of the actuating cam 41, so that the actuating shaft 33 to which the movable blade 35 is fixed is It is separated from the hook drive shaft 10 in the movement mechanism of the sewing machine. Therefore, if the sewing machine is operated in this state, there is no risk of the holder 18 rattling within the sewing machine bed 4, and the entire upper surface of the sewing machine bed 4 can be effectively utilized with the movable blade 35 stopped, allowing normal sewing to be performed. Able to perform work. Next, when performing overlock stitching while cutting the edge of the work cloth using the fabric edge cutting device, remove the cover plate 9A on the throat plate 7 and also remove the hook cover 6 on the front of the sewing machine bed 4. When the opening operation is performed and the locking member 29 is moved to the left from the front opening portion using the operation piece 29c against the action of the spring 31, the locking piece 29b is separated from the shaft pin 24 at the bottom of the holder 18. .

As a result, the support body 15 is rotated counterclockwise in FIG. 4 by the action of the spring 17, and the holder 18 is rotated clockwise by the action of the spring 20, so that the shaft pin 24 The holder 18G is moved to the upper left side along the elevation guide portion 23b within the guide groove 23 of No. 21, and then moved to the left along the movement guide portion 23a, and the holder 18G is automatically moved to the use position shown in FIG. Moved and placed. On the other hand, when the holder 18 is moved from the storage position to the use position, as shown in FIG. The cam 41 is moved to the left by sliding engagement with a surface 41d having the same radius, and the surface 41d
The other engaging piece on the opposite side is the inclined part 41c of the actuating cam 41.
along the operating cam part 41a, and is automatically integrated with the operating cam part 41a as shown in FIG.

Therefore, the actuating shaft 33 of the cloth edge cutting device is connected to the hook driving shaft in the movement mechanism of the sewing machine, and the movable blade 35 can be reciprocated as the sewing machine is operated. Then, when the operation knob 27 of the locking body 25 is rotated clockwise in the use position of the holder 18, the lower end of the screw thread 28 is pressed into engagement with the rear side upright piece of the guide body 21, and the guide body 25 is rotated clockwise. The groove width in the movement guide portion 23a of the groove 23 is reduced, and the guiding action of the guide groove 23 on the mari pin 24 is temporarily blocked.

For this purpose, the holder 18 is locked so that it cannot move in the use position, and in this state, the lid plate 9A is attached to the closing opening 7c of the throat plate 7.
If a separate cover plate 9 is attached, only the front end of the drive arm 34 including the movable blade 35 and the cloth handling piece 39 will protrude above the upper surface of the sewing machine bed 4, as shown in FIGS. 1 and 5. , most of the holder 18 is covered by the cover plate 9. Therefore, when the sewing machine is operated in this state, the movable blade 35 reciprocates via the operating cam part 41a of the operating cam 41, the bifurcated arm 40, the operating shaft 33, and the driving arm 34 as the hook driving shaft 10 rotates. The movable blade 35 and fixed blade 3
2, the edges of the workpiece cloth being transferred in the cloth feeding direction are cut, and the sewing machine needle 2 and hook 14 cooperate to cut the edges of the workpiece cloth, and the sewing machine needle 2 and hook 14 cooperate with each other to complete the hem stitching immediately after the cutting operation section. Also, during this sewing work, hold holder 1 as described above.
Since most of the upper part of the cloth handling section 8 is covered by the cover plate 9, there is no possibility that the cloth waste generated in the cutting operation section will stagnate in the vicinity thereof, and will be guided to the rear right side along the upright section 39a of the cloth handling piece 39. It is quickly discharged from the cutting operation section at the upper surfaces of the lid plate 9 and needle plate 7.

Therefore, it is possible to easily and accurately cut the edges of the cloth and overlock without being hindered by cloth scraps. Next, a case will be described in which the cloth edge cutting device is stored in the sewing machine bed 4 again.

In this case, first remove the cover plate 9 from the state shown in FIG. 3 and rotate the operating knob 27 of the locking body 25 counterclockwise in almost the reverse order of the operation during use as described above. The pressure engagement of the screw punch 28 with the rear side upright piece of the part body 21 is released, and the ball pin 24 at the lower part of the holder 18 is in a state where it can move along the guide groove 23 of the guide part body 21.
Thereafter, when the holder 18 is moved to the right from the use position shown in FIG. 3 by hooking a finger on the protruding portion of the movable blade 35 and the like and is pressed downward from the predetermined movement position, the shaft pin 24 is inserted into the guide groove 23. The holder 18 moves from the left end to the lower right end along the sewing machine bed 4 shown in FIG.
It is placed in the storage position inside. When the holder 18 is moved, the rattan pin 24 is moved to the vertical guide portion 23b of the guide groove 23.
When moving downward to the right side along In the guide groove 2
3, the neck stopper body 29 moves back to its original position as shown in FIG. Therefore, the holder 18 is held in the storage position so as not to be able to move freely.
On the other hand, when the holder 18 is moved from the use position to the storage position, as shown in FIG.
One engagement piece of the two-pronged arm 40 that is iron-coupled with the actuating cam 41 is moved to the right along a surface 41d having the same radius as the actuating cam 41, as shown in FIG. The small diameter portion 41b is opposite to the small diameter portion 41b.

Therefore, the connection between the operating shaft 33 of the cloth edge cutting device and the shuttle drive shaft 10 in the movement mechanism of the sewing machine is disengaged, and in this state, if the cover plate 9A covering the entire opening 7c of the throat plate 7 is attached, As shown in FIG. 4, the machine is in a state where normal sewing work can be performed. Note that the present invention is not limited to the configuration of the above-mentioned embodiments; for example, the configuration of the support mechanism may be changed so that almost the entire upper surface of the holder is exposed above the sewing machine bed surface when the holder is in the use position. The configuration of each part may be changed as desired without departing from the spirit of the invention, such as by changing the specific configuration of the holder, drive shaft, bifurcated arm, support mechanism, locking mechanism, or operating cam. You can also do that. As described in detail above, the present invention has at least a use position where the movable blade is exposed above the sewing machine bed surface and can cut the edge of the workpiece cloth in cooperation with the fixed blade, and a position where the movable blade is exposed above the sewing machine bed surface. A fabric edge cutting device is built into the sewing machine bed so that it can be stored in a lower storage position, and when stored, the two-pronged arm for reciprocating the movable blade is placed on the drive shaft that interlocks with the main shaft of the sewing machine. The motion is not transmitted to the movable blade relative to the small part of the operating cam installed in the
When moved to the use position, the forked arm automatically competes with the operating cam part from the small diameter part of the operating cam via the inclined part, so that the movable blade and the movement mechanism of the sewing machine are connected. Therefore, despite the simple configuration of the coupling mechanism, the movement mechanism of the movable blade and sewing machine can be easily adjusted by simply moving the fabric edge cutting device to the use position or storage position without requiring any other adjustment operations. This has an excellent effect of automatically separating the connections between the two.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a partial perspective view of a sewing machine showing the state in which a cloth edge cutting device embodying the present invention is used, and Fig. 2 is a partial plan view of the sewing machine bed section, also shown with the cover plate removed. , FIG. 3 is a sectional view taken approximately along the line 3-3 in FIG. 2, FIG. 3, FIG. 6 is a sectional view taken approximately at line 6-6 in FIG. 3, FIG. 7 is a partial sectional view taken approximately at line 7-7 in FIG. 2, and FIG.
This figure is a partial sectional view showing a state in which the cloth edge cutting device is stored in the sewing machine bed from the state shown in FIG. 7. 4... Sewing machine bed, 7... Throat plate, 1
0... Hook drive shaft, 15... Support body, 18
...Holder, 21 ...Guide body, 2
3... Guide groove, 24... Shaft pin, 25...
... Locking body, 32 ... Fixed blade, 33 ...
... Operating axis, 34... Drive arm, 35... Movable blade, 4
0...Two-pronged arm, 41...Operating cam, 4
1a...Operating cam part, 41b...Small folding part, 41c...Incline part. Figure 2 Figure 3 Figure Ship Figure 4 Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Scope of Claims] 1. A holder to which a fixed blade is fixed; a drive arm having a movable blade for cutting work cloth in cooperation with the fixed blade and movably attached to the holder; a bifurcated arm integrally connected to the drive arm and configured to reciprocate the movable blade in conjunction with a movement mechanism of the sewing machine;
The holder is mounted on the sewing machine bed so that the movable blade can take at least a working position where the movable blade is exposed above the sewing machine bed surface and can cut the edge of the work cloth, and a storage position where the movable blade is located below the sewing machine bed surface. A fabric edge cutting device is provided, which includes a support mechanism for movably supporting the holder within the sewing machine, and a locking mechanism for preventing movement of the holder in the use position, and is disposed within the sewing machine bed and interlocks with the main shaft of the sewing machine. Fix the operating cam to the drive shaft,
The operating cam has an operating cam portion into which the bifurcated arm is fitted when the holder is in use and allows the bifurcated arm to move, and a small diameter portion that faces the bifurcated arm without moving when the holder is in the storage position. and an inclined portion connecting the small diameter portion and the actuation cam portion, and the bifurcated arm automatically engages with the actuation cam portion when the holder is moved from the storage position to the use position. A sewing machine with a built-in fabric edge cutting device. 2. The operating cam portion, small diameter portion, and inclined portion of the operating cam are:
2. A sewing machine incorporating a cloth edge cutting device according to claim 1, which is formed with a surface having the same radius from the axis of the drive shaft at a predetermined common angular position.