JP2722800B2 - Tape cutting device of tape sewing machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape sewing machine for sewing a tape supplied from a tape supply source to a work cloth, and in particular, from a work cloth to a tape supply source after sewing the tape. The present invention relates to a tape cutting device of a tape sewing machine for cutting an extending tape.

[Prior Art] Conventionally, as this type of apparatus, for example, Japanese Utility Model Laid-Open No. 54-1453
As described in Japanese Patent Publication No. 71, there is known a material embodying a bead sewing machine to which a slide fastener can be sewn.

This bead sewing machine is disposed on the operator side (preparation position) from the needle drop point, and has a guide tube through which a slide fastener drawn out from a supply spool is inserted.
A mold ruler, a pair of clamps which hold the work cloth on both sides of the T-shaped ruler and are moved to the delivery side beyond the needle drop point, and to the T-shaped ruler and the delivery side of the worker side from the needle drop point. An air scissor that advances from the standby position to the clamp that has been moved, cuts a slide fastener extending from the work cloth to the guide tube of the T-shaped ruler, and then retreats to the standby position.

[Problems to be Solved by the Invention] When the slide fastener is completely cut by the air scissors, the above-described device retreats the air scissors and moves the pair of clamps toward the worker side from the needle drop point. It is possible to exchange the work cloth on which the slide fastener has been sewn and a new work cloth immediately after the movement, and has an advantage of good workability.

However, when the slide fastener is not completely cut by the air scissors, the slide fastener may be stuck on the air scissors,
When the air shear moves backward in this state, the slide fastener is pulled off from the work cloth held by the clamp, and the slide fastener is unnecessarily pulled out from the guide tube of the T-shaped ruler. Thereafter, when the clamp is moved to the preparation position while holding the work cloth, the slide fastener is further peeled off from the work cloth, and the commercial value as a finished product is lost.

Even when the slide fastener is not hooked on the air shears, the slide fastener is unnecessarily pulled out from the guide tube of the T-shaped ruler by moving the clamp to the preparation position. After that, the operator cuts the sewn work cloth with scissors in order to replace it with a new work cloth, and pulls out an excessively extended slide fastener from the guide pipe of the T-shaped ruler, which is troublesome. Work had to be done.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and its purpose is to remove a tape from a work cloth by moving a cutter even when a tape such as a slide fastener is not completely cut. It is an object of the present invention to provide a tape sewing apparatus of a tape sewing machine which can completely cut a tape without being cut or unnecessarily fed out from a tape supply source.

Means for Solving the Problems In order to achieve the above object, the present invention provides a tape sewing machine for sewing a tape supplied from a tape supply source to a work cloth. A use position having a fixed blade, a movable blade, and first driving means for driving the movable blade, wherein the tape can be used to cut a tape extending from the work cloth to a tape supply source after sewing the tape; A tape cutter provided movably between the position,
Second driving means for moving the tape cutter between the two positions; and responsive to a signal generated after the sewing of the tape, the first drive means in a state where the tape cutter is disposed at a use position. First control means for operating the drive means to cut the tape after operating the second drive means and for moving the tape cutter to the non-use position; Discriminating means for discriminating whether or not the tape has been cut, and, based on the discrimination result from the discriminating means that the tape has not been cut, preventing the first control means from moving the tape cutter to an unused position. And
Second control means for reactivating the first drive means in response to operation of the operation switch.

[Operation] In the present invention, in response to a signal generated after the tape is sewn, the first control means operates the first driving means of the tape cutter arranged at the use position to move the movable blade. In cooperation with the fixed blade, the tape extending from the work cloth to the tape supply source is cut. After the tape is cut, the second driving means is operated to move the tape cutter to the unused position.

On the other hand, the discriminating means discriminates whether or not the tape cutter has cut the tape by means of the first control means, and the second control means determines whether or not the tape has been cut by the first control means. Is prevented from moving to the non-use position, and the first driving means is reactivated according to the operation of the operation switch by the operator.

[Embodiment] Hereinafter, an embodiment in which a slide fastener of the present invention is embodied in a bead sewing machine for sewing a bead portion to a bead portion will be described with reference to drawings.

As shown in FIG. 1, the sewing machine main body 1 is arranged on a sewing machine table 2. The needle bar 3 is provided on an arm portion of the sewing machine main body 1 so as to be vertically movable, and two needles 4 are attached to a lower end thereof. The needle 4 constitutes a stitch forming device together with a thread catcher (not shown) provided in the bed portion 1a of the sewing machine main body 1, and two parallel lockstitches are formed on the work cloth in cooperation with each other. Eyes are formed.

As shown in FIGS. 1 and 2, the clamp device 5 constituting the cloth feeding device is arranged on the sewing machine table 2 along the straight line passing through the drop point (stitch forming position) of the needle 4 on the worker side. 1 can be reciprocated by a clamp moving motor 49 between a preparation position (indicated by a two-dot chain line in FIG. 1) and a sewing completion position (indicated by a solid line in FIG. 1). Are located. As is well known in the art, the clamp device 5 includes a pair of vertically movable large presser plates 6 for pressing and holding the workable cloth W1 on the surface of the table 2,
The bead W2 as a work cloth placed on the best cloth W1,
A pair of laterally openable and closable folding plates 7 that are folded from both sides to surround a binder 9 described later and that are held on the best-view cloth W1, and a work cloth placed on the ball cloth W2 There is provided a pair of vertically movable flap holders 8 for pressing and holding the flap cloth W3 on the folding plate 7.

The binder 9 is arranged above the sewing machine table 2 so as to be able to ascend and descend so as to extend from a preparation position of the clamp device 5 to a stitch forming position. The binder 9 has a substantially inverted T-shaped cross section as is well known in the art, and after the bead cloth W2 is placed on the best-looking cloth W1, the bead cloth W2 is placed prior to the folding operation of the folding plate 7. It is lowered up and its ball cloth W2
Is pressed and held on the cloth W1.

As is well known, the binder 9 has a slide fastener F fed from a spool S as a tape supply source.
Is provided on the bead cloth W2 or the flap cloth W3 pressed and held by the clamp device 5.

Then, in the state where the clamp device 5 is moved to the preparation position shown by the chain line in FIG. 1, the large holding plate 6, the folding plate 7, the flap holding body 8 and the binder 9 cooperate with each other. As shown in FIG. 7, the free cloth W1, the bead cloth W2 and the flap cloth W3 are pressed and held on the sewing machine table 2, and the free ends of a pair of separated slide fasteners from which the teeth are separated in advance are used to clamp the teeth. 5 are guided on both sides of the binder 9 in a state of facing the large presser 6, respectively, and the ends of the free ends thereof are aligned with the seam forming start ends on the bead cloth W2 and the flap cloth W3. In this state, when the worker presses the sewing start pedal, the needle 4 is reciprocated up and down to form a stitch for connecting the slide fastener F, the flap cloth W3, the ball cloth 2 and the best-looking cloth W1, and is clamped by the clamp moving motor 49. The device 5 is moved and sewing is performed.

Next, the slide fastener cutting device 10 will be described.

A base 11 is detachably attached to the bed 1a of the sewing machine with screws 12, and a support block 14 is rotatably supported on the base 11 via a pin 13. Guide holes 15 (only one is shown in FIG. 3) which are parallel to each other are formed through the support block 14, and guide shafts 16 are slidably accommodated in the guide holes 15, respectively.

One end of each of the pair of guide shafts 16 has a cutting device described later.
The body block 21 of 20 is screwed and the guide shaft 16
A connecting plate 17 is screwed to the other end of. This connecting plate
17 has a through hole 17a through which a cylinder portion of a second air cylinder 18 described later penetrates.

The second air cylinder 18 as a second driving means has a cylinder portion formed on the support block 14 such that the direction in which the piston rod 19 expands and contracts is parallel to the axis of the guide shaft 16. It is fixed in a hole (not shown). The piston rod 19 of the second air cylinder 18 has a thread portion 19a formed at the tip thereof, and is screwed to the main body block 21. Therefore, this second air cylinder
By operating 18, the main body block 21 is guided by the guide shaft 16 and the guide hole 15, and
Position close to 14 (referred to as unused position; see Fig. 1)
And a position away from the support block 14 and close to the needle 4 (refer to FIG. 3 referred to as a use position).

The cutter 20 includes a main body block 21, a fixed blade 22, a movable blade 23, and a first air cylinder 24 as first driving means. The main body block 21 is integrally formed with a first arm 21a protruding toward the needle from one side (the rear side in FIG. 3) and a second arm 21b protruding in the opposite direction. A fixed blade 22 is fixed to the tip of the first arm 21a, and a movable blade 23 cooperating with the fixed blade 22 is rotatably supported via a pin 25.

The first air cylinder 24 is rotatably connected to an end of the second arm 21b via a pin 26 at an end of the cylinder portion, and is fixed to a tip of a piston rod 24a. A block 27 is rotatably connected to an end of a transmission arm 23a formed integrally with the movable blade 23 via a pin 28. Therefore, by operating the first air cylinder 24, the movable blade 23 is moved to a cutting position (shown by a solid line in FIG. 3) and a non-cutting position (2 in FIG. 3).
(Represented by a dashed line).

A slide fastener cutting sensor 30 for detecting the position of the piston when the movable blade 23 is located at the cutting position and outputting a detection signal is provided on the cylinder portion of the first air cylinder 24.
Is attached.

A third air cylinder 35 is rotatably connected to the base 11 via a pin 36 in the cylinder portion. The distal end of a piston rod 35a has a lower protruding portion 14a integrally formed with the support block 14. Are rotatably connected to each other via a pin 37. Therefore, the third air cylinder 35
The support block 14 can be switched between the horizontal state and the inclined state shown in FIG. By switching the support block 14 to the horizontal state, it is possible to increase the distance between the lower end of the cutter 20 moved to the non-use position and the bed 1a.

 Next, the electrical configuration will be described with reference to FIG.

A central processing unit (hereinafter referred to as a CPU) 40 has a two-stage stepped-on clamp pedal switch (automatic return type) 42, a sewing start switch (automatic return type) 43, and a disconnection via an input port 41 on its input side. A device use switch (on / off position holding type) 44, a movable blade up / down switch (automatic return type) 45, and the slide fastener cutting sensor 30 are connected. On the output side, on the other hand, a sewing machine motor 47 via an output port 46, a large presser plate 6 and a folding plate
Air cylinder group 48 for driving the flap holder 8 and the clamp device moving motor 49;
A binder vertical air cylinder 50 for vertically moving the binder 9, the first air cylinder 24, the second air cylinder 18, and the third air cylinder 35 are respectively driven via drive circuits 51 to 57. It is connected.

Further, a ROM 58 and a RAM 59 are connected to the CPU 40, and the ROM 58 stores an operation program shown by a flowchart in FIGS. 5 (a) and 5 (b). The CPU 40 functions as first and second control means and also as discriminating means.

Next, the operation will be described with reference to the flowcharts of FIGS. 5 (a) and 5 (b) and the state explanatory diagrams of FIGS. 6 (a) to 6 (c).

First, the operator determines whether or not to cut the slide fastener F using the cutter 20, and then operates the cutter use switch 44 to set the switch to the ON state if used and the OFF state if not used. I do. After this, a power switch (not shown)
Is turned on, the CPU 40 starts the processing of the flowchart shown in FIGS. 5 (a) and 5 (b).

When the power is turned on, the CPU 40 initializes each device. That is,
When the clamp device 5 is moved to the preparation position, the large presser plate 6 rises from the table 2, the folded plate 7 enters the large presser plate 6, and the flap presser 8 is separated from the large presser plate 6. At this time, the binder 9 is lifted from the table 2 and the piston rod 35a of the third air cylinder 35 of the slide fastener cutting device 10 is sucked to hold the support block 14 in a horizontal state. Further, the piston rod 19 of the second air cylinder 18 is sucked to hold the cutter 20 at the unused position, and the piston rod 24a of the first air cylinder 24 is projected to hold the movable blade 23 at the cutting position. .

After turning on the power, the CPU 40 determines whether or not the first stage of the clamp pedal switch 42 is turned on (step S1), and repeats this determination until the first stage of the switch 42 is turned on. During this time, the worker places the best-fitting cloth W1 on the table 2.

When the determination in step S1 is YES, the CPU 40 activates the air cylinder group 48 to lower the large presser plate 6 to press and hold the cloth W1 at the best time (step S2).

In step S3, the CPU 40 sets the clamp pedal switch 4
It is determined whether or not the second stage 2 is turned on, and this determination is repeated until it is turned on. During this time, the operator presses the large holding plate 6
The beading cloth W2 and the flap cloth W3 are set at different setting positions. The slide fastener F is supplied in advance by the supply spool S.
And set in the binder 9.

When the determination in step S3 is YES, the CPU 40 activates the binder vertical air cylinder 50 to lower the binder 9 between the pair of large presser plates 6, thereby allowing the central portion of the beaded cloth W2 to be viewed at the center of the cloth W1.
(Step S4), and clamp air cylinder group 48
Is operated to cause the folding plate 7 to project toward the binder 9 to bend the bead cloth W2 along the shape of the binder 9, and then the flap pressing member 8 onto the folding plate 7 from which the flap cloth W3 projects.
(Step S5). As a result, the best cloth W
1. The bead cloth W2 and the flap cloth W3 are held in the state as shown in FIG. At this time, slide fastener F
The ends of the large holding plates 6 on both sides of the binder 9
And the tip of the binder 9
And protrudes toward the needle 4 side and is arranged on the ball cloth W2 (flap cloth W3) (see FIG. 6 (a)).

Thereafter, the CPU 40 waits for an ON signal from the sewing start switch 43 (step S6). When the sewing start switch 43 is turned on, the CPU 40 drives the sewing machine motor 47 to reciprocate the needle 4 up and down (step S7), and drives the clamp device moving motor 49 to complete the sewing of the clamp device 5. Move to the position (step S8). As a result, a bead is formed, and the slide fastener F is sewn to the bead portion. When the sewing is completed (see FIG. 6 (b)), the CPU 40 stops the sewing machine motor 47 (step S9) and activates the binder vertical air cylinder 50 to raise the binder 9 (step S9).
S10, see FIG. 6 (c)), the ON / OFF state of the switch 44 is determined (step S11).

Here, it is assumed that the cutting device use switch 44 has been set to an ON state in advance in order to use the cutting device 10.

Since the determination in step S11 is YES, the CPU 40 protrudes the piston rod 35a of the third air cylinder 35, switches the support block 14 to the inclined state as shown in FIG. 3, and moves the cutter 20 closer to the bed 1a. , Second air cylinder
The piston rod 19 of the 18 is projected to move the cutter 20 toward the use position, and the piston rod 24a of the first air cylinder 24 is sucked to move the movable blade 23 to the non-cutting position (step S12).

When the movement of the cutter 20 to the use position is completed, the slide fastener F extending from the work cloth W to the binder 9 between the fixed blade 22 and the movable blade 23 as shown in FIG. It will be located.

Thereafter, the CPU 40 protrudes the piston rod 24a of the first air cylinder 24 to move the movable blade 23 to the cutting position to cut the slide fastener F (step S13), and whether the slide fastener cut sensor 30 is on. It is determined whether or not it is (step S14). The slide fastener cutting sensor 30 magnetically detects the position of the piston (stroke end position) in the cylinder when the movable blade 23 is completely moved to the cutting position, and outputs an ON signal when the cutting position is at the cutting position. When the movable blade 23 does not reach the cutting position without completely cutting F, an off signal is output.

When the determination in step S14 is YES, that is, when the slide fastener F is disconnected, the CPU 40
The piston block 19 is sucked and moved to the unused position of the cutter 20, and the piston rod 35a of the third air cylinder 35 is sucked to switch the support block 14 to a horizontal state as shown in FIG. Then, the cutter 20 is raised from the bed 1a (step S15). This ends the operation of the slide fastener cutting device.

On the other hand, if the slide fastener F is not completely cut in step S13 despite the cutting operation of the movable blade 23, the slide fastener cut sensor 30 outputs an OFF signal. NO, the CPU 40 determines whether or not the movable blade up / down switch 45 has been turned on. If it is off, the CPU 40 returns to the determination routine of step S14 (step S16).

Therefore, the CPU 40 repeats the determination routine of steps S14 and S16, and if the operator turns on the movable blade up / down switch 45 during that time, the determination of step S16 becomes YES. Then, the CPU 40 once sucks the piston rod 24a of the first air cylinder 24 to move the movable blade 23 to the non-cutting position, and then projects the piston rod 24a again to move the movable blade 23.
Is moved to the cutting position, and the process returns to the determination routine of step S14 (step S17). As a result of the manual operation of the movable blade 23, if the slide fastener F is completely cut off, the CPU 40 performs the processing of the step S15 to terminate the operation of the slide fastener cutting device 10, but when the slide fastener F is not completely cut off, Since the operator waits for the movable blade up / down switch 45 to be turned on again, the operator can repeatedly operate the movable blade 23 until the slide fastener F is completely cut.

As described above, when the cutting of the slide fastener F by the cutting device 10 is completed in steps S12 to S17, the CPU 40
Drives the clamp device moving motor 49 to move the clamp device 5 to the preparatory position (step S18), and activates the clamp air cylinder group 48 to return the flap holder 8 and the folding plate 7 to the initial state. After that, the large presser plate 6 is raised from the table 2 to release the sewn work cloth (step S19). Thereafter, the CPU 40 returns to the process of step S1, and waits until a new best-looking cloth W1 is placed on the table 2 and the first stage of the clamp pedal switch 42 is turned on. In this way, a large number of beaded seams with slide fasteners can be produced.

By the way, if a large number of clothes are continuously produced using the slide fastener cutting device 10 described above, the sharpness between the fixed blade 22 and the movable blade 23 of the cutter 20 is reduced, and as a result, the movable blade up / down switch 45 No matter how many times you operate the slide fastener F
When the cutting device 10 cannot be cut, or when the two blades 22 and 23 are damaged, the use of the cutting device 10
May not be possible until 3 is replaced.

In such a case, it is possible to respond by stopping the operation of the slide fastener cutting device 10 by turning off the cutting device use switch 44 and cutting by a hand scissor or the like by the operator. It is.

In this case, after the processing of steps S1 to S10 is performed and the sewing of the slide fastener F to the bead portion is completed and the binder 9 is raised, the CPU 40 executes the ON state determination routine of the cutting device use switch ( If the determination result in step S11) is N
Since it becomes O, it is determined whether or not the first stage of the clamp pedal switch 42 is on, and this determination routine is repeated until it is turned on (step S20).

At this time, since the slide fastener F extends from the work cloth disposed at the sewing completion position to the binder 9 at the raised position, the operator can easily cut the slide fastener F by hand scissors or the like. When the cutting of the slide fastener F is completed and the clamp pedal switch 42 is depressed, the first stage is turned on, so that the determination in step S20 is YES and the CPU 40 proceeds to step S20.
The process proceeds to 18, S19. In steps S18 and S19, after the clamp device 5 is moved to the preparation position and the large presser plate 6 is raised to release the sewn work cloth, the CPU 40 proceeds to the processing in step S1, and the CPU 40 moves to a new work cloth. Wait for the set.

The present invention is not limited only to the above-described embodiment, and various changes can be made without departing from the gist of the present invention. For example, instead of the air cylinder, another actuator such as a solenoid can be used as the first and second driving means.

[Effects of the Invention] As described in detail above, the present invention prevents the tape cutter from moving to the unused position when the tape such as the slide fastener is not completely cut, and operates the operation switch to operate the tape cutter. The tape drive can be completely cut by cooperating the movable blade and the fixed blade by re-actuating the first drive means. It has the advantage of excellent practicality without being moved to the use position and peeling off the tape from the work cloth and losing commercial value, and the tape is not unwound from the tape supply source. .

[Brief description of the drawings]

1 to 6 show a bead sewing machine according to an embodiment of the present invention. FIG. 1 is a perspective view showing a schematic configuration thereof. FIG. FIG. 3 is an explanatory view showing a held state, FIG. 3 is a front view showing a slide fastener cutting device partially cut away, FIG. 4 is a block diagram showing an electric configuration, and FIGS. 5 (a) and 5 (b). Is a flowchart showing the operation of the CPU, and FIGS. 6 (a) to 6 (c).
Is an explanatory diagram showing a sewing operation. In the figure, 1 is a sewing machine main body, 4 is a needle, 5 is a clamp device, 6
Is a large presser plate, 7 is a folding plate, 9 is a binder, 10 is a slide fastener cutting device, 18 is a second air cylinder (second driving means), 20 is a cutter, 22 is a fixed blade, 23 is a movable blade, 24 is a first air cylinder (first driving means), 30 is a slide fastener cutting sensor (determination means), 40 is a CPU (first and second control means), S is a slide fastener spool (tape supply source), F is a slide fastener, W1 is a fine cloth, W2 is a ball cloth, and W3 is a flap cloth.

Claims (1)

(57) [Claims] 1. A tape sewing machine for sewing a tape supplied from a tape supply source onto a work cloth, wherein a first driving means for driving a fixed blade, a movable blade and the movable blade for cutting the tape. A tape cutting device movably provided between a use position capable of cutting a tape extending from the work cloth to the tape supply source after the tape is sewn and a non-use position separated therefrom; A second driving means for moving the tape cutter between the two positions; and a first drive means for responding to a signal generated after the tape sewing, in a state where the tape cutter is arranged at a use position.
After the tape is cut by operating the driving means of
A first control means for activating the drive means for moving the tape cutter to the non-use position; a discriminating means for discriminating whether or not the tape cutter has cut the tape by the first control means; Based on the result of the determination from the determining means that the tape has not been cut, the movement of the tape cutter to the unused position by the first control means is prevented, and the first driving means is operated in accordance with the operation of the operation switch. And a second control means for re-actuating the tape sewing machine.