JP2795488B2 - Upper knife drive for lock sewing machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an upper knife driving device in a lock sewing machine.

[Conventional technology]

8 and 9 show an upper knife driving device in a conventional lock sewing machine, 1 is a main shaft of the sewing machine, 2 is an upper knife swing cam having a center portion fixed to the main shaft 1, and 3 is one end of the upper cam. An upper knife swing arm, which is fixed to the knife drive shaft 4 and the other end of which is engaged with the upper knife swing cam 2, 5 is an upper knife drive arm connected to the upper knife drive shaft 4, and 7 is An upper knife holder rotatably supported by the free end of the upper knife drive arm 5,
8 is an upper knife knob fixed to one end of the upper knife holder 7, 9 is a stopper pin provided on the upper knife knob 8,
Reference numeral 10 denotes a pin hole provided at the free end of the upper knife driving arm 5 for receiving the stopper pin 9, and 11 denotes an upper knife holder for suppressing the stopper pin 9 in a direction always engaging with the pin hole 10. A spring, 12 is an upper knife for cutting cloth fixed to the other end of the upper knife holder 7, 13 is a lower knife, 14 is a lower knife holder, and 15 is a frame.

In such a conventional upper knife drive device of a lock sewing machine, the upper knife swing arm 3 is swung by rotation of the upper knife swing cam 2 mounted on the main shaft 1, and the free end of the upper knife drive arm 5 is moved to the upper knife. The upper knife 12 is moved up and down with respect to the lower knife 13 via the upper knife holder 7 supported on the free end of the upper knife drive shaft 4 so as to cut the cloth. Has become.

When performing double chain stitching, replacing needles, or passing a thread through the needle hole, the upper knife knob 8 is turned against the upper knife holder spring 11 as shown in FIGS. When the stopper pin 9 is detached from the pin hole 10 and turned by pulling outward, the upper knife 12 rotates about 270 ° until it hits a stopper (not shown), and moves rearward in a substantially horizontal state with the upper surface of the frame 15. They are being evacuated.

[Problems to be solved by the invention]

However, in the above-described conventional upper knife driving device of the lock sewing machine, since the upper knife driving arm 5 is directly moved by the upper knife swing arm 3 via the upper knife driving shaft 4, the driving of the upper knife must be stopped. Is impossible unless you stop the sewing machine. Therefore, when performing double chain stitching, there is a fear that a finger may go under the upper knife driving arm 5 by mistake, and in such a case, it is extremely dangerous.

 The present invention has been made to eliminate the above disadvantages.

[Means for solving the problem]

The upper knife drive device in the lock sewing machine of the present invention includes a connecting rod that swings in conjunction with an upper knife drive shaft that is driven in conjunction with the main shaft of the sewing machine, a hole provided in a free end of the connecting rod, and a base end. An upper knife driving arm pivotally supported by the frame and having an upper knife at the free end, a retracting means for retracting the upper knife from the operating position to the non-operating position, and a hole coaxial with the hole, An insertion bracket interlocked with the upper knife drive arm, a connection pin inserted through the hole of the insertion bracket, supported and inserted into and removed from the hole, and insertion and removal means for inserting and removing the connection pin, The connection rod and the upper knife drive arm are releasably connected by inserting and removing the connection pin from the hole by operating the insertion / removal means.

An upper knife driving device in a lock sewing machine according to the present invention includes a connecting rod that swings in conjunction with an upper knife drive shaft that is driven in association with a main shaft of the sewing machine, a hole provided in a free end of the connecting rod, and a base. An upper knife drive arm pivotally supported at the end to the frame and having an upper knife at a free end, retreat means for retreating the upper knife from the working position to the non-working position, and a hole coaxial with the hole. An insertion bracket interlocking with the upper knife drive arm, a connection pin inserted into and supported by the insertion bracket and inserted into and removed from the hole, and a connection operation lever for connecting the connection pin and the upper knife retraction means. Wherein the connecting pin and the upper knife driving arm are releasably connected by inserting and removing the connecting pin from the hole in conjunction with the operation of the upper knife retreating means.

An upper knife driving device in a lock sewing machine according to the present invention includes a connecting rod that swings in conjunction with an upper knife drive shaft that is driven in association with a main shaft of the sewing machine, a hole provided in a free end of the connecting rod, and a base. An upper knife drive arm pivotally supported at the end by the upper knife drive shaft and having an upper knife at the free end, an insertion bracket having a hole coaxial with the hole and interlocking with the upper knife drive arm; A connection pin that is inserted into and supported by the insertion bracket and inserted into and removed from the hole, and insertion and removal means for inserting and removing the connection pin. The connection lever and the upper knife drive arm are releasably connected by being inserted into and removed from the hole.

(Operation)

In the upper knife driving device of the lock sewing machine according to the present invention, when the upper knife is not used, the driving of the upper knife is stopped, and the upper knife and / or the upper knife driving arm are moved to the retracted position as necessary.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In the present invention, as shown in FIGS. 1 and 2, the upper knife driving arm 5 is separated from the upper knife driving shaft 4, and the base 5 'of the upper knife driving arm 5 is connected to the frame via a pivot pin 15'. A connecting means which is rotatably supported by a pivot 15 and is released by pulling the upper knife knob 8 axially outward (downward in FIG. 1) between the upper knife drive arm 5 and the upper knife drive shaft 4.
Connect with 16.

The connecting means 16 includes a connecting rod 17 having one end fixed to the upper knife swing arm 3, a connecting pin 19 having one end inserted into and removed from a hole 18 formed at the other end of the connecting rod 17, A connecting operating arm 21 having one end connected to the other end of the connecting pin 19 and an intermediate portion rotatably supported on the upper knife driving arm 5 via a supporting pin 20; The other end of the arm has a connection operating lever 22 having one end pivotally supported and the other end rotatably connected to the upper knife knob 8, and a hole 34 coaxial with the hole 18; And an upper knife interlock arm 25 as an insertion bracket interlocking with the upper knife knob 8.
Against the upper knife holder spring 11 in the axial direction (first
Pulling downward in the figure) the retaining ring 33 fixed to the shaft
By means of the connecting operating arm via the connecting operating lever 22
1 pivots counterclockwise in FIG. 1 through the pivot pin 20, so that one end of the connecting pin 19 comes out of the hole 18 of the connecting rod 17 as shown in FIG. And the connection between the upper knife drive arm 5 and the upper knife drive arm 5 are disconnected.

Since the upper knife driving device in the lock sewing machine of the present invention has the above-described configuration, when performing double chain stitching, exchanging a needle, or passing a thread through a needle hole, the upper knife knob 8 is used as an upper knife holder. If the stopper pin 9 is disengaged from the pin hole 10 by pulling it axially outward against the spring 11, the upper knife 12 is turned together with the upper knife knob 8 by turning the upper knife knob 8 clockwise in FIG. 4, the connecting means 16 is released via the connecting operation lever 22, and the upper knife driving arm 5 is no longer driven, so that it is extremely safe.

When the upper knife 12 is driven up and down for cutting the cloth, the upper knife drive arm 5 is lowered downward until it hits the upper knife drive arm stopper 6, and the upper knife knob 8 is rotated to make the pin hole 10 and the stopper pin. When 9 is matched, the upper knife holder 7 is returned to the original position by the restoring force of the upper knife holder spring 11, and the upper knife 12 is pressed against the lower knife 13.

At this time, the connection operation lever 22 is pushed by the upper knife knob 8 and moves, the connection operation arm 21 rotates clockwise in FIG. 3, and the connection pin 19 enters the hole 18 of the connection rod 17 to drive the upper knife. The arm 5 and the upper knife swing arm 3 are connected, and the upper knife 12 is driven up and down by the rotation of the upper knife swing cam 2.

In the embodiment of the present invention, as shown in FIGS. 1 and 2, one side of the base 5 'of the upper knife driving arm 5 between the frame 15 and the upper knife driving arm 5, that is, as shown in FIG. An arm turning spring 23 is stretched so as to pass below the base 5 ′, and the upper knife driving arm 5 is always suppressed by the arm turning spring 23 in a direction where the upper knife 12 is directed toward the lower knife 13. Arm rotation spring 23
The upper knife 12 is connected to the lower knife 13
If it is turned upward or clockwise in FIG. 2, the arm turning spring 23 is moved to the other side of the base 5 'of the upper knife driving arm 5, that is, as shown in FIG. 4th
As shown in the figure, the upper knife drive arm 5 is spontaneously moved to a position where it comes into contact with the drive arm stopper 24 by the action of the arm rotation spring 23 as shown in FIG. It turns clockwise.

In the above embodiment, the retracting means (7, 8, and 7 in FIG. 1) for retracting the upper knife 12 from the working position to the non-working position.
9, 10, 11), and therefore the insertion / removal means (FIG. 1)
In steps 8, 21, 22), the upper knife drive arm 5 and the connecting rod 17 are disconnected from each other, the upper knife drive arm 5 is immobilized, and the retracting means is operated to return to the non-operating position. Because the upper knife can be moved, the upper knife is not driven even if the upper knife drive shaft is accidentally driven when the upper knife is moved to the non-working position. can do.

Further, it has a configuration of a connection operating lever 22 for connecting the connection pin 19 and the upper knife retreating means, and therefore, special insertion / removal means for connecting / disconnecting the upper knife drive shaft and the connection rod is required. In addition, the upper knife can be moved to the non-operating position by operating the retracting means, and at the same time, the connection between the upper knife driving arm and the connecting rod can be released.

Further, since a large gap is formed between the needle plate and the free end of the upper knife drive arm 5, the work area at the time of sewing is widened and double chain stitching is performed. This is extremely convenient when passing through.

5 to 7 show still another embodiment of the present invention. In this embodiment, the upper knife drive shaft 4 is fixed to the upper knife drive arm 5, and the upper knife swing arm 3 is connected to the upper knife. The connecting rod 17 is pivotally supported on the drive shaft 4 and the connecting means 16 has one end fixed to the upper knife swing arm 3, and one end is inserted into and removed from a hole 18 formed in the connecting rod 17. Connecting pin 19 and the upper knife drive shaft 4 so as to slidably support the connecting pin 19.
The upper knife interlocking arm 25 fixed to, a tension spring 25a for suppressing the upper knife interlocking arm 25 to always rotate in one direction, a projecting pin 26 protruding from the other end of the connection pin 19, A switching lever 28 having an elongated hole 27 at its free end for inserting the protruding pin 26, and an upper knife drive switching knob 29 fixed to the base of the switching lever 28 and rotatably supported by the frame 15.
By turning the upper knife drive switching knob 29, the connecting pin 19 is connected to the connecting rod 17 via the switching lever 28.
6 and 7, when the connecting pin 19 comes out of the hole 18 of the connecting hole 17, the projecting pin 26 is inserted into the long hole 27 by the action of the tension spring 25a. The upper knife interlocking arm 25 is displaced until it reaches the upper end.

Reference numeral 30 denotes a stop spring, and reference numerals 31 and 32 denote a connecting link and a needle driving rod for connecting the upper knife swing arm 3 and the upper knife swing cam 2 respectively.

In this embodiment, the connecting means 16 can be released by turning the upper knife drive switching knob 29 instead of the upper knife knob 8.

According to another embodiment of the present invention, an upper knife drive arm 5 having a base end pivotally supported by the upper knife drive shaft 4 and having a free end on the upper knife 12 is provided. The axis and the rotation axis of the upper knife drive arm are coaxial. Therefore, the rotation trajectory of the insertion bracket 25 and the connecting rod 17 becomes the same, and the connecting pin 19 and the hole 18 are not rubbed, and the durability is good.

In this case, the insertion / removal means is a projection pin shown in FIG.
26, long hole 27, switching lever 28 and upper knife drive switching knob
Point to 29.

〔The invention's effect〕

As described above, according to the upper knife driving device in the lock sewing machine of the present invention, when the upper knife is not used, the swing of the upper knife driving arm can be stopped when the upper knife is not used. Can be deviated in a direction away from the needle plate, so that there is a great advantage in that a work area at the time of sewing can be widened and the work becomes convenient.

[Brief description of the drawings]

1 and 2 are a plan view and a front view of an upper knife driving device in a lock sewing machine according to the present invention showing a case where a movable knife for cloth cutting moves up and down in conjunction with a moving part of the sewing machine to cut the cloth. 3 and 4 are a plan view and a front view of the upper knife driving device of the lock sewing machine of the present invention showing the state where the movable knife is retracted, and FIG. 5 is an upper knife driving device of the lock sewing machine of the present invention. Perspective view showing another embodiment of the sixth embodiment.
FIGS. 7 and 8 are cross-sectional views for explaining the operation state of the connecting pins. FIGS. 8 and 9 are a plan view and a front view of an upper knife driving device in a conventional lock sewing machine, and FIGS. FIG. 3 is a plan view and a front view showing a state where the movable knife is retracted. 1 ... spindle, 2 ... upper knife swing cam, 3 ... upper knife swing arm, 4 ... upper knife drive shaft, 5 ... upper knife drive arm, 5 '...
... Base, 6 ... Upper knife drive arm stopper, 7 ... Upper knife holder, 8 ... Upper knife knob, 9 ... Stopper pin, 10 ... Pin hole, 11 ... Upper knife holder spring, 12 ...
Upper knife, 13 ... Lower knife, 14 ... Lower knife holder, 15 ...
Frame, 15 '... pivot pin, 16 ... connecting means, 17 ...
Connecting rod, 18 hole, 19 connecting pin, 20 pivot pin,
21 ... connecting operating arm, 22 ... connecting operating lever, 23 ... arm rotating spring, 24 ... driving arm stopper, 25 ... upper knife interlocking arm, 26 ... protruding pin, 27 ... long hole, 28 ...... Switch lever,
29 ... Upper knife drive switching knob, 30 ... Stop spring, 31
... Connecting link, 32 ... Needle drive rod, 33 ... Retaining ring.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) D05B 37/06 D05B 83/00

Claims (3)

(57) [Claims] A connecting rod (17) swinging in conjunction with an upper knife drive shaft (4) driven in conjunction with a main shaft of a sewing machine, and a hole (18) provided in a free end of the connecting rod (17). An upper knife drive arm (5) pivotally supported at the base end to the frame (15) and having an upper knife (12) at the free end; and moving the upper knife (12) from the working position to the non-working position. Evacuation means for evacuation, an insertion bracket (25) having a hole (34) coaxial with the hole (18), interlocking with the upper knife drive arm (5), and a hole (25) of the insertion bracket (25). 34) a connection pin (19) that is inserted into and supported by the inside of the hole (18), and insertion / removal means for inserting / removing the connection pin (19); By connecting and disconnecting the connecting pin (19) from the hole (18), the connecting rod (17) and the upper knife drive arm (5) are releasably connected. Upper knife driving device in sewing machine according to claim. 2. A connecting rod (17) swinging in conjunction with an upper knife drive shaft (4) driven in conjunction with a main shaft of a sewing machine, and a hole (18) provided in a free end of the connecting rod (17). An upper knife drive arm (5) pivotally supported at the base end to the frame (15) and having an upper knife (12) at the free end; and moving the upper knife (12) from the working position to the non-working position. Evacuation means for evacuation, an insertion bracket (25) having a hole (34) coaxial with the hole (18), interlocking with the upper knife drive arm (5), and a hole (25) of the insertion bracket (25). 34) a connection pin (19) inserted into and supported by the inside of the hole (18), and a connection operation lever (22) for connecting the connection pin (19) and the upper knife retreating means. In conjunction with the operation of the upper knife retracting means, the connection pin (1
An upper knife driving device for a lock sewing machine, wherein the connecting rod (17) and the upper knife driving arm (5) are releasably connected by inserting and removing 9) from the hole (18). 3. A connecting rod (17) swinging in conjunction with an upper knife drive shaft (4) driven in conjunction with a main shaft of a sewing machine, and a hole (18) provided in a free end of the connecting rod (17). An upper knife drive arm (5) having a base end pivotally supported by the upper knife drive shaft (4) and having an upper knife (12) at its free end; and a hole coaxial with the hole (18). An insertion bracket (25) interlocking with the upper knife drive arm (5); and an insertion bracket (25) inserted through the hole (34) of the insertion bracket (25). A connection pin (19) to be removed; and insertion / removal means for inserting / removing the connection pin (19). The operation of the insertion / removal means inserts and removes the connection pin (19) from the hole (18). An upper knife driving device in a lock sewing machine, wherein the connecting rod (17) and the upper knife driving arm (5) are releasably connected by doing so.