JPS5910236B2 - tape sewing machine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tape sewing machine, and in particular, to sewing a futon cover, etc. by sewing a tape wrapped around a core string to the side edges of two pieces of work cloth fed above and below the tape. The present invention relates to a tape sewing machine that is capable of sewing.

This type of sewing machine is equipped with a wrapper 1 as shown in FIGS. 1 and 2, and the tape 2 is folded in half by the wrapper 1, and a core cord 3 is inserted into the folded portion 2a.

Then, the needle 4, which moves vertically and reciprocally in conjunction with the main shaft of the sewing machine, is placed on the cloth feeding side, that is, from the sewing needle 4 to the second
A cutter 5 is arranged at a position apart in the direction of arrow A shown in the figure, and the cutter 5 reciprocates up and down in synchronization with the up and down reciprocation of a fixed menu 5a fixed below the bed surface 6 of the sewing machine and the sewing needle 4. It is composed of a movable menu 5b for exercising.

Both ends of the above-mentioned folded tape 2 and the two work cloths 7a and 7b fed above and below the tape 2 are sewn together while being trimmed by the cutter 5.

This sewing operation differs depending on whether the side edges of the work cloths 7a, 7b are linear or curved.

In the case of a linear shape, the sewing work described above can be accomplished by simply allowing the operator to continuously rotate the main shaft of the sewing machine at a desired speed by depressing the foot pedal for speed control.

However, in the case of a curved shape, the following operations are required.

When moving from the linear side end to the curved end of the work cloths 7a, 7b, the rotation of the main shaft is temporarily stopped.

While it is stopped, is the tip of the sewing needle 4 touching the tape 2 and the processed cloth? The operator manually rotates the sewing machine pulley to adjust the position of the main shaft so that it is inserted into the sewing diagonal 4. A and 7b are rotated at an appropriate angle in the force direction of arrow B as shown in FIG. 1, and the work cloths are set thereon.

Next, the worker depresses the foot pedal again and adjusts the amount of depressing of the foot pedal so that the main shaft rotates at a constant low speed.
Tape 2 and processing cloth according to the rotation of its main axis? a,7b
A small number of stitches are formed on the cloth while trimming it with a cutter 5 at the side edge.

By repeating the above multiple operations, the processed cloths 7a, 7
b is cut into a desired curved shape, and the tape 2 is sewn to the curved end.

However, in the conventional sewing work explained above, the processed cloth 7
The work of rotating and setting a and 7b is done using cutter 5.
This process was performed regardless of whether or not the movable menu 5b was located above the workpiece cloths 7a, 7b, so that the workpiece cloths 7a, 7b had already been cut by the cutter 5.
The length of the unsewn part is not constant. Is movable menu 5b processed cloth? When a and 7b are cut and in the lower position, the length of the unsewn portion becomes longer and reaches its maximum length.

Such uneven lengths of the unsewn parts cause the following defects.

That is, the smaller the radius of curvature r (shown in FIG. 3) at the curved ends of the work cloths 7a and 7b to which the tape 2 is sewn, the lower the speed of rotation of the main shaft with one depression of the foot pedal. However, the number of stitches (hereinafter referred to as low-speed stitches) that can be formed accurately along the curved edge is reduced.

The number of stitches to be sewn at low speed is based on the maximum length of the unsewn part, which is equivalent to the distance LM (shown in Figure 2) between the sewing needle 4 and the end of the movable menu 5b on the cloth feeding side. Therefore, the minimum value of the radius of curvature r is limited accordingly.

Therefore, the tape 2 cannot be beautifully sewn onto the curved end portion of the curved end portion whose radius of curvature r is unnecessarily smaller than the minimum value.

In addition, it is troublesome for workers to manually adjust the position of the spindle in the multiple tasks mentioned above.
The more acutely the curved ends of the workpiece cloths 7a and 7b are bent, that is, the smaller the angle θ shown in FIG. The amount of data has become enormous, causing a decrease in work efficiency.

Furthermore, since the work of forming low-speed stitches on the workpiece cloths 7a, 7b and the tape 2 must be carried out while maintaining the rotation of the main shaft of the sewing machine at a constant low speed, the operator has to adjust the speed. Must be skilled.

Therefore, the present invention was made in view of the above-mentioned drawbacks, and includes a fixed position stopping device for stopping the movable knife of the sewing needle and cutter at a predetermined position, and a main shaft of the sewing machine that rotates at a constant low speed. It is an object of the present invention to provide a tape sewing machine which can easily sew a tape to a curved end of a work cloth by providing a means for sewing the tape to a curved end of a work cloth.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described with reference to the drawings.

In FIG. 4, reference numeral 8 denotes a sewing machine body, and in this embodiment, a two-needle overlock sewing machine equipped with a sewing needle 4 and a shorter sewing needle 4a is used.

9 is a main shaft of the sewing machine, on which a sewing machine pulley 10 and a rotary plate 11 are mounted.

12 is a detector for detecting the positions of the sewing needles 4, 4a, and includes one permanent magnet piece 13 fixed to the rotary plate 11, and a normally open reed switch P disposed on the sewing machine body 8.
D.

The reed switch PD is activated by the action of the permanent magnet piece 13 when the sewing needle 4 reaches the lower force position NP1 on the bed surface 6 and the sewing needle 4a and the movable menu 5b reach the upper force positions NP2 and CP on the bed surface 6, respectively. It is configured to be closed.

Reference numeral 14 denotes a cloth presser foot for pressing the tape 2 and the work cloths 7a and 7b, and is attached to one end 16a of the presser arm 16 by a pin 15, as shown in FIG.

The joint between the presser foot 14 and the presser arm 16, that is, the presser foot 1
Since the fulcrum of 4 is located away from the through hole 18 of the sewing needles 4, 4a formed in the throat plate 17 in the direction of cloth feeding force C shown in FIG. Pressing force by the presser foot 14 is applied intensively to the part where the sewing is completed, and it is possible to prevent the sewing from occurring between the tape 2 and the work cloths 7a and 7b.

The other end 16b of the presser arm 16 is rotatably supported by a shaft 19 and connected to an intermediate portion of a rotating lever 21 by a connecting rod 20.

One end 21a of the rotary lever 21 is rotatably attached to the machine frame of the sewing machine by a screw 22, and the free end 21a is rotatably attached to the machine frame of the sewing machine by a screw 22.
A spring 23 constantly applies tension in the force direction of arrow D shown in FIG.

Further, the rotary lever 21 is provided with a convex portion 24 at a position close to its free end 2lb, and the convex portion 24
A plunger 26 of a solenoid 25 is in contact with the tip of the solenoid 25 .

FIG. 6 shows a state in which the solenoid 25 is energized, and due to the energization of the solenoid 25, the presser foot 14 is raised and separated from the bed 6 as shown in FIG.

27 is a driving device for rotating the main shaft 9 of the sewing machine, and includes a main motor 28 that constantly rotates at a high speed and an auxiliary motor 29 that rotates at a constant low speed.

The main 1 drive device is composed of the main motor 28, a flywheel 31 fixed to the rotor shaft 30, and a clutch plate 33 fixed to the output shaft 32 on the side opposite to the flywheel 31. .

The output shaft 32 is rotatably and slidably attached to the bracket of the main motor 28, and its end opposite to the flywheel 31 is connected to the main shaft 9 of the sewing machine via a belt 34.

A brake wheel 35 is rotatably supported around the output shaft 32, one side facing the clutch plate 33, and a worm gear 36 attached to the other side.

A worm 37 meshes with the worm gear 36, and its shaft portion 38 extends on both sides.

A rotating plate 39 is fixed to one end, and the other end is formed as a spline shaft and a movable plate 40 is fitted therein.

41 is a brake coil attached to the bracket of the main motor 28, and when it is excited, it attracts the movable plate 40 toward the fixed brake 42 and stops the rotation of the shaft 38, so its end can be used as a spline shaft. A movable plate 44 that is formed and faces the rotary plate 39 is fitted therein.

The auxiliary drive device is composed of the auxiliary motor 29 and the movable plate 44.

45 is a drive coil, and when it is excited, the movable plate 44
is sucked toward the rotary plate 39, and the rotation of the auxiliary motor 29 is transmitted to the shaft portion 38.

Reference numeral 46 designates a clutch lever, which includes a main lever 48 whose intermediate portion is rotatably supported by a shaft 47 on the bracket of the main motor 28 and whose upper end is operatively connected to the output shaft 32; and an auxiliary lever 50 rotatably supported by a shaft 49.

A foot pedal 51 is connected to the auxiliary lever 50 of the clutch lever 46 by a connecting rod 52 and is configured to be able to be depressed in two directions from a neutral position around its support shaft 53. There is.

Also, in the clutch lever 46, there is a normally open front depression switch SF which is closed by an auxiliary lever 50 which is rotated at the initial stage of depression of the foot pedal on the toe side, and a normally open front depression switch SF which is closed when the foot pedal 51 is depressed on the heel side. Auxiliary lever 5 to be rotated
A normally open type rear depression switch SP which is closed by 0 is provided.

Furthermore, even after the previous pedal switch SF is closed, the foot pedal 5 remains
1 is depressed toward the toe side, the entire clutch lever 46 is rotated, and the clutch plate 33 is moved toward the flywheel 31 side.On the other hand, when the depression is released, the clutch lever 46 is moved toward the return spring 54. The actuation causes the clutch plate 33 to be brought into engagement with the brake mechanism 35.

Reference numeral 55 denotes a knee lever, the middle part of which is rotatably attached to the machine frame of the sewing machine by a shaft 56, and a knee pedal 57 as an operator operating means is attached to one end of the lever.

A normally open switch SN is provided at the other end of the knee lever 55, and when the knee pedal 57 is depressed in the direction of the arrow E shown in FIG. 4 against the spring force of the return spring 58. The switch SN is configured to be closed.

Reference numeral 59 denotes a rotating shaft rotatably supported by a support member 60 attached to the machine frame of the sewing machine, and the above-mentioned wrapper 1 is fixed to the rotating shaft 59 by fixtures 61 and 62.

63 is an operating lever rotatably attached to the sewing machine body 8 by a shaft 64, one end of which is connected to the flexible wire 6.
5 is connected to the intermediate portion of the aforementioned rotating lever 21, and the other end is adapted to engage with a free end 66a of a first lever 66 fixed to the rotating shaft 59.

67 is a second lever fixed to the rotating shaft 59, and its free end 6 is moved toward a fixed body 68 fixed to the machine frame of the sewing machine.
7a is constantly pressed by the action of a spring 69.

When the free end 67a of the second lever 67 is in contact with the fixed body 68, the wrapper 1 from which the tape 2 is fed out
The delivery side 1a of the pump is in a lowered state as shown by the imaginary line in FIG.

70 is a winding device for winding the tape 2, which includes a holding member 71 fixed to the sewing machine, a shaft 73 attached to the holding member 71 by an adjustment screw 72, and the shaft 7.
The reel 74 is rotatably mounted around the shaft 73, and the spring 75 is fitted into the shaft 73 and constantly presses one side of the reel 74. It can be adjusted by the amount of tightening.

Next, the operation of each of the operating parts described above regarding the control circuit of this embodiment shown in FIG. 10 will be explained.

However, P and N are busbars connected to positive and negative power supplies, and R
1 to R11 indicate relays.

RA, RB, RC are solenoid 25, drive coil 45
and brake coil 41, and are configured so that when these relays are in an energized state, the solenoid 25 and both of its coils 41, 45 are energized.

NR and CR indicate the normally open contact and normally closed contact of the above-mentioned relay, and the contact of each relay is shown with the number or symbol of the corresponding relay attached after NR and CRO.

Figures 11 and 12 are time charts for explaining the operation of switches and relays during sewing work.
FIG. 3 shows the relationship between the operations of the sewing needles 4, 4a and the movable knife 5b and the cloth feeding period T, and also shows the opening and closing operations of the reed switch PD of the detector 12.

In FIG. 13, L1 and L2 are sewing needles 4 and 4a.
, and L3 indicates the movement trajectory of the cutting edge of the movable menu 5b.

Now, in order to sew the two-folded tape 2 to the linear side ends of the work cloths 7a and 7b, the foot pedal 51 is depressed with the toe to close the front depression switch SF (ON shown in FIG. 11).
state) and rotates the clutch lever 46 to engage the clutch plate 33 with the flywheel 31, the rotation of the main motor 28 is transmitted to the main shaft 9 of the sewing machine via the output shaft 32.

When the toe of the foot pedal 51 is depressed, the relay RA is always demagnetized, so the solenoid 2
5 becomes demagnetized in the same way, and the sending side 1 of wrapper 1
a and the presser foot 14 are in a lowered state as shown by imaginary lines in FIG. 5, and come into contact with the workpiece cloths 7a and 7b.

When the main shaft 9 begins to rotate, the sewing needles 4, 4a and the movable knife 5b are in the stopped state shown in FIG.
The sewing needle 4a stops at the lower force position NP1, and the tip of the sewing needle 4a and the cutting edge of the movable menu 5b are separated from those cloths, and the bed surface 6
It escapes from the stopped state at upper force positions NP2 and CP and rises.

As a result, the closed reed switch PD of the detector 12 is opened and the relay R1 is demagnetized.

The relay R1 is energized as shown in FIG. 11 every time the reed switch PD is closed.

Also, at the same time as the front depression switch SF is closed, the relay R4
Since power is supplied from the bus P through the switch SF, the relay R4 is energized.

Excitation of relay R4 closes its normally open contact NR4.
relay R11 is energized, and then relay R connected in series with the normally open contacts NR4 and NRI1 of both relays is energized.
5 is also energized.

Once the relay R5 is energized, the relay R1? The energized state is maintained until the normally open contact NRI 1 is opened.

While the tape 2 is being sewn to the straight side ends of the work cloths 7a, 7b, the above-mentioned relays R4, R5, R11 are kept in the energized state.

When the foot pedal 51 is released from the toe depression operation and returned to the neutral position in order to transfer the sewing work from the linear side edges to the curved edges of the work cloths 7a, 7b, the front depression switch SF is opened (the 11th At the same time, the clutch plate 33 is separated from the flywheel 31 and engaged with the brake mechanism 35, and the rotational speed of the output shaft 32 is reduced while being braked.

As a result, the rotational speed of the main shaft 9 similarly decreases, and the period during which the reed switch PD is in the closed state becomes longer.

As described above, when the front depression switch SF is opened, power is supplied to the relay R4 via the normally closed contact CR1 of the relay R1 while the reed switch PD is in the open state, and the opposite reed switch PD is in the closed state. The normally closed contact C
Capacitor C1 connected in parallel with R1 is charged and power is supplied to relay R4.

However, when the rotational speed of the main shaft 9 becomes lower than a preset low speed, the reed switch PD becomes closed longer than the charging time TP of the capacitor C1 set by the time constant circuit consisting of the capacitor C1 and the variable resistor VR1. for a certain period,
In other words, since the period in which normally closed contact CR1 is in the open state becomes longer, the power supply to relay R4 is stopped and that relay R
4 is demagnetized at time t1 shown in FIG.

Simultaneously with the demagnetization of relay R4, its normally closed contact CR4 is closed, and relay R6 is energized for a set time T1 by a time constant circuit consisting of capacitor C2 and variable resistor VR2, and is in a demagnetized state due to the excitation of relay R6. Normally closed contact CR7, normally closed contact CR4, and normally open contact N of relay R7
Relay RB is also energized via R5.

Relay R11 maintains its energized state because relay RB continues to be energized even when relay R4 is demagnetized.

The drive coil 45 is excited by the energization of RB, and the movable plate 44 is attracted by the attraction action of the drive coil 45 and engaged with the rotating plate 39, and the shaft portion 38 of the worm 37, the worm gear 36, and the brake are attracted. The rotation of the auxiliary motor 29 is transmitted to the clutch plate 33 and the output shaft 32 via the clutch plate 33 and the output shaft 32, respectively.

The main shaft 9 of the sewing machine, which had been rotating due to inertia, is driven by the auxiliary motor 29 and rotates at a constant low speed.

The main shaft 9 is driven at low speed for at least a set time T1, and after the set time T1 has elapsed, the reed switch PD
is closed (time t2 shown in FIG. 11), relay R
7 is energized to demagnetize relay RB and energize relay RC via its normally open contact NR7 and capacitor C4.

As a result, the drive coil 45 is demagnetized and the rotating plate 39 is separated from the movable plate 44, while the brake coil 41 is excited and the movable plate 40 is attracted toward the fixed brake 42.

Then, the movable plate 40 and the fixed brake 42 are engaged, and the main shaft 9 of the sewing machine is braked via the output shaft 32.

Braking of the main shaft 9 is done by capacitor C4 and variable resistor VR3.
This is carried out for a set time T2 set by a time constant circuit consisting of.

Relay R11 is activated at the same time as relay RB is demagnetized.
When RC continues to be excited through its regular contact NRC and the aforementioned set time T2 has elapsed (the 11th
At time t3) shown in the figure, the relay Rll is demagnetized together with the relay RC.

Due to the demagnetization of relay R11, relay R5 is demagnetized and capacitors C2 and C4 connected in parallel with its normally closed contact CRI 1 discharge their residual charge via resistors DRI and DR3.

When the braking of the main shaft 9 is completed and the sewing needles 4, 4a and the movable menu 5b are stopped in the state shown in FIG. 2,
The foot pedal 51 is depressed from the neutral position to the heel side to close the rear depression switch SP (ON state shown in FIG. 12), and the switch SP and the demagnetized relay R. 1
Relay RA is energized via normally closed contact CR11 of No. 1.

The solenoid 25 is energized by the energization of the relay RA to move the plunger 26, and the convex portion 24 of the rotary lever 21 that is in contact with the tip of the plunger 26 is pressed and moved from the position shown by the imaginary line in FIG. The pivot lever 21 is pivoted to the position shown by the solid line.

With the rotation of the rotation lever 21, the presser foot 16 is rotated around the shaft 19, and the presser foot 14 is raised to the position shown by the solid line in FIG. 5, and the operating lever 63 is also rotated around the shaft 64. The first lever 66 and the second lever 67 are rotated together with the rotation shaft 59.

At the same time, the delivery side 1a of the wrapper 1 is rotated about its rotation axis 59 and raised to the position shown by the solid line in FIG.

As mentioned above, when the sewing needles 4, 4a and the movable menu 5b are stopped and the presser foot 14 and the feeding side 1a of the wrapper 1 are raised, the work cloths 7a, yb can be rotated on the bed 6. The work cloths 7a and 7b are rotated by an angle desired by the operator in the force direction of arrow B shown in FIG. 1 to bring them into the state shown by imaginary lines in FIG.

At this time, the sewing needle 4 is inserted through the tape 2 and the work cloths 7a and 7b, and the tape 2 is given an appropriate tension by the spring 75 shown in FIG. The tape 2 is attached to the processed cloth 7 in the
a There is no deviation from y7b.

When the setting of the work cloths 7a and 7b is completed, the knee pedal 57 is pressed in the direction of arrow E shown in FIG. 4 in order to start the sewing operation again.

When the knee pedal 57 is suppressed and the switch SN is closed (time t4 shown in FIG. 12), the relay R2 is energized via the rear depression switch SP and the switch SN,
Relay R3 is also energized via its normally open contact NR2.

Since the reed switch PD is in the closed state, the relay R8 is energized via the normally open contacts NR1 and NR3 of the relay R1 and the capacitor C3, and the relay is energized via the normally open contacts NR1 and NR3. Normally open contact CRI O of relay RIO with R9 energized and demagnetized
Relay RB is also energized at the same time via normally open contact NR3.

Once the relay R3 is energized, even if the knee pedal 57 is released, as long as the rear depression switch SP is not released, the relay R3 will continue to operate its switch SP, the normally open contact NR3, the normally closed contact CR4 of the deenergized relay R4, and the The energized relay R11 of the relay RB is subsequently energized via the normally open contact NR11.

When the relay RB is energized and the drive coil 45 is energized, the movable plate 44 is attracted and engaged with the rotary plate 39, and the main shaft 9 of the sewing machine is driven by the auxiliary motor 29 via the output shaft 32 to generate a constant Rotate at low speed.

Excitation of relay R8 is done by resistors TR1, TR2 and TFt3.
Since the operation is performed for the set time T3 set by the resistor selected by the selection switch TS and the capacitor C3, the relays R and 10 connected in series with the normally closed contact CR8 continue to be demagnetized, and the relay RB The excitation state of is maintained.

After the aforementioned set time T3 has elapsed, the reed switch PD
is closed (time t5 shown in FIG. 12), relay R
10 is energized via normally open contacts NR1, NR3, NR9 and normally closed contact CR8, relay RB is demagnetized and relay RC is energized via its normally open contact NR10 and capacitor C4.

Relay R11 continues to be energized via its normally open contact NRC.

When the knee pedal 57 is pressed once, the main shaft 9 of the sewing machine changes from time t4 to time t shown in FIG. 12 as described above.
5, the workpiece cloth 7a is driven by an auxiliary motor 29 and rotates at a constant low speed until
A preset number of stitches (the number of opening and closing times of the reed switch PD shown in FIG. 12) are formed on the tape 7b and the tape 2.

Thereafter, the drive coil 45 is demagnetized by the demagnetization of the relay RB, the rotary plate 39 is separated from the movable plate 44, and the relay R
The brake coil 41 is excited by the excitation of C, the movable plate 40 is engaged with the fixed brake 42, and the main shaft 9 of the sewing machine is braked via the output shaft 32.

Braking of the main shaft 9 is performed for a period when the relay RC is in an excited state, that is, for a set time T2 set by the capacitor C4 and the variable resistor VR3.

When the set time T2 has elapsed (time t shown in FIG.
6), relays RC and R11 are demagnetized and relay R
3 is also demagnetized, the closing of its normally closed contact CRI 1 causes capacitors C3 and C4 to discharge their residual charge through resistors DR2 and DR3, and relay RA is reenergized, and the opening of its normally open contact NR3 causes relay R9 to discharge. is demagnetized.

The relays in the control circuit shown in FIG. 10 have all returned to the demagnetized state, except for the rear-depression switch SP which is in the closed state and the relay RA which is re-energized.

The rotation of the main shaft 9 of the sewing machine is completely stopped by the braking performed during the set time T2, and the sewing needles 4, 4a and the movable menu 5b are stopped.
stops in the state shown in FIG. 2, and while the relay RA is in an energized state and the solenoid 25 lifts the presser foot 14 and the feed-out side 1a of the wrapper 1 away from the workpiece cloths 7a and 7b, the workpiece cloth ? A and 7b are further rotated by an appropriate angle in the force direction of arrow B from the position shown by the imaginary line in FIG. 1, and the work cloths are set thereon.

When the knee pedal 57 is pressed again, the operation described above is performed, a preset number of stitches are formed on the work cloth γa v 7 b and the tape 2, and the sewing needles 4, 4a and the movable menu 5b are At the same time as it stops in the state shown in FIG.
The rise is separated from the stop.

By repeating the pressing operation of the knee pedal 57 as long as the foot pedal 51 is depressed on the heel side, the processed cloth? a
, 7b are cut by the cutter 5 into a curved shape desired by the operator, and the tape 2 is sewn to the cut curved ends.

By one pressing operation of the knee pedal 57, the work cloth 7a,
7b and the number of stitches formed on the tape 2 is determined by the set time T.
3. Therefore, in order to increase the number of stitches, it is necessary to lengthen the set time T3.

In particular, when the radius of curvature r at the curved ends of the work cloths 7a and 7b shown in FIG. Therefore, a resistor with a large resistance value is selected by the selection switch TS and the set time T3 is lengthened.

In this embodiment, two motors are used: a main motor 28 for variable speed drive and an auxiliary motor 29 for constant low speed drive. Of course, the main shaft 9 of the sewing machine may be rotated by controlling the rotation speed.

As is clear from the detailed description above, the present invention uses a sewing needle and a movable knife of a cutter in a sewing machine that uses a cutter to trim a work cloth and a tape overlapped along the side edges of the cloth and sew the two together. By providing a fixed position stop device for stopping at a predetermined position and a means for rotating the main shaft of the sewing machine at a constant low speed, tape can be attached to the curved end of the work cloth cut by the cutter. This makes it easier to handle the processed fabric when sewing the fabric, and always keeps the length of the unsewn part to a minimum (second
LS shown in the figure, the tape can be sewn beautifully even on a curved end with a small radius of curvature r, and furthermore, when sewing the tape on the curved end, the operator has to Since manual work is reduced, sewing work efficiency can be improved.

[Brief explanation of the drawing]

Figures 1 to 3 are explanatory diagrams for explaining the sewing work of sewing work cloth and tape, Figures 4 to 9 show the present embodiment, and Figure 4 is a diagram of a tape sewing machine. A front view, FIGS. 5 to 7 are explanatory diagrams for explaining the operations of the presser foot and the wrapper, FIG. 8 is a sectional view taken along the line ■-■ in FIG. 7, and FIG. 9 is a side view of the winding device. Fig. 10 is a circuit diagram showing the relay control circuit of this embodiment, Figs. 11 and 12 are time charts for explaining the operation of this embodiment, and Fig. 13 is a movable knife of the sewing needle and cutter. FIG. In the figure, 1 is a wrapper, 1a is the sending side of the wrapper 1, 2 is a tape, 4, 4a are sewing needles, 5 is a cutter, 5a
, sb are the fixed menu and movable knife of the cutter 5, 7
a and 7b are work cloths, 9 is a main shaft of the sewing machine, 12 is a detector, 25 is a solenoid (third operating means), 21 is a drive device, 2B and 29 are main motors included in the drive device 27; Auxiliary motor, 31 is flywheel, 32
is the output shaft, 33 is the clutch plate, 35 is the brake theory, 39
is a rotating plate, 40 is a movable plate, 41 is a brake coil, 44
45 is a movable plate, 45 is a drive coil (second actuating means), 46 is a movable plate;
is a clutch lever (first actuation means), 51 is a foot pedal, 57 is a knee pedal, 70 is a winding device, 75 is a spring constituting the winding device, R1 to R11 are relays,
RA, RB, RC are relays, PD is a reed switch included in the detector 12, NP1, NP2 are sewing needles 4, 4
The lower and upper positions of a and CP are the upper positions of the movable menu 5b.

Claims (1)

[Scope of Claims] 1. A cloth presser for pressing a workpiece cloth and a tape superimposed along its side edge, a sewing needle that moves vertically and reciprocally in conjunction with the main shaft of a sewing machine, and the sewing needle. a cassotater disposed on the cloth feeding side and having two knives that move relative to each other in synchronization with the up and down reciprocating movement of the sewing needle; A sewing machine that sews both sides of the tape while aligning both ends, the machine comprising: at least one driving means for rotating the main shaft; and operating the driving means to rotate the main shaft at a variable speed over a predetermined speed range. a first actuating means for actuating the driving means to rotate the main shaft at a constant low speed; and a first suppressing means for actuating the first actuating means. a foot pedal capable of operation and a second pressing operation for canceling the action of the first actuating means and raising and separating the presser foot from the work cloth and tape; an operating member capable of performing a suppressing operation to cause the sewing needle to pass through the work cloth and the tape when both the first suppressing operation of the foot pedal and the suppressing operation of the operating member are released; A tape stitching sewing machine characterized in that a fixed position stopping device is provided for stopping the sewing needle and the cutter so that the two knives of the cutter are both separated from the work cloth and the tape. . 2. A patent claim characterized in that at least while the second actuating means is acting due to the suppressing operation of the operating member, the lifting action of the presser foot caused by the second pressing operation of the foot pedal is disabled. The tape sewing machine according to item 1. 3. The tape is wound around a winding means, and the tape is supplied from the winding means to a wrapper, and the side edges of the folded tape and the two pieces of work cloth fed above and below the tape are trimmed by the cutter. 2. The tape sewing machine according to claim 1, wherein the tape sewing machine sews the sewing machine while sewing the tape. 4. The tape sewing machine according to claim 3, wherein the winding means includes elastic means for applying appropriate tension to the tape. 5. The wrapper is pivotally supported on the machine frame of the sewing machine, and is configured such that the feeding side of the tape is always pressed downward and the feeding side rises in conjunction with the presser foot. A tape sewing machine according to claim 3. 6. A presser foot for pressing the work cloth and the tape superimposed along its side edges, a sewing needle that moves up and down in conjunction with the main shaft of the sewing machine, and a sewing needle placed on the cloth feeding side of the sewing needle. and a cutter having two knives that move relative to each other in synchronization with the up and down reciprocating movement of the sewing needle, and the cutter cuts at least the side edges of the work cloth to separate both ends of the work cloth and the tape. A sewing machine that sews both while aligning the two, comprising: at least one drive means for rotating the main shaft; and a first actuation for operating the drive means to rotate the main shaft at variable speeds over a predetermined speed range. means, second actuating means for actuating the driving means to rotate the main shaft at a constant low speed, and third actuating means for raising and separating the presser foot from the work cloth and tape. , a foot capable of a first pressing operation for activating the first actuating means and a second suppressing operation for releasing the action of the first actuating means and activating the third actuating means; a foot pedal; a scrap member operable to suppress the operation of the second actuating means; and when the first suppressing operation of the foot pedal and the pressing operation of the operating member are both released, the stitching is performed. a fixed position stop device for stopping the sewing needle and cutter such that the tip of the needle is inserted through the work cloth and tape and the two knives of the cutter are both separated from the work cloth and tape; and a stitch number setting device that operates in response to a pressing operation of the operating member to form a preset number of stitches on the work cloth and tape. sewing machine. 7. The tape according to claim 6, wherein the stitch number setting device includes a stitch number selection switch for selectively forming different preset numbers of stitches. Sewing machine. 8 at least while said second actuating means is in operation;
7. The tape sewing machine according to claim 6, wherein the action of the third actuating means is canceled regardless of the second pressing operation of the foot pedal.