JPS5934389B2 - Operation control device for electric sewing machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an operation control device for an electric sewing machine, which is characterized in that the sewing machine can be started and stopped extremely easily using either hands or knees of a worker. be.

Electric sewing machines currently on the market are equipped with a sewing machine motor in the sewing machine main body, and are equipped with a foot-operated controller that is electrically connected to the motor and placed outside the sewing machine main body, and suppresses operation of the controller. This is a system in which the rotational speed of the motor is continuously variable controlled.

In this type of sewing machine, the sewing machine is started and stopped by the operator's feet, so both hands can always be used to guide the transfer of the fabric to be processed, and the sewing machine operating speed can be adjusted arbitrarily depending on the location of the sewing work. While this has the advantage of being able to be adjusted at any time, it tends to limit where the sewing machine can be used.

In other words, when using the controller on a kotatsu (a kotatsu kotatsu), the actual situation is that when a worker wants to use the controller while sitting, he or she cannot operate the controller with his or her feet, and must operate it by holding it between his knees. .

However, under these operating conditions of the controller, it is extremely difficult to adjust the operating speed of the sewing machine at will, and the sewing machine may suddenly start running, or may not be able to continue operating at low speed. However, it is not only extremely dangerous to work with, but also may prevent stitches from being formed along desired sewing lines.

In view of these circumstances, instead of controlling the operating speed of the sewing machine using a foot-operated controller as described above, only the speed control section of the motor is housed in a small frame that can be held in the hand, and it is possible to guide the transfer of the work cloth and operate the sewing machine. The speed can be controlled simultaneously by the operator's hands, or the motor rotation speed can be selected and set in advance using a dial, etc., and the motor can be controlled by operating a manual operation member movably mounted on the sewing machine body. Systems that control only the supply and cutoff of power have already been proposed.

These types of sewing machines are convenient when a worker uses them while sitting in a kotatsu, but when using them while sitting on a chair, those who are accustomed to using foot-operated controllers may find it difficult to use.

For this reason, the sewing machine is designed so that the operation of the sewing machine can be controlled by the operator's hands, and if necessary, a foot-operated controller can be connected and the operation of the sewing machine can also be controlled by the operation of the controller. has already been proposed.

Although this type of sewing machine is certainly easy to operate, it has the disadvantage that it increases the cost and also makes it difficult to store such a foot-operated controller in order to provide a compact sewing machine.

The present invention has been made as a result of considering the above-mentioned actual situation, and by simply adding a few members to a conventional sewing machine, an operator can control the operation of the sewing machine using either hands or knees.
Moreover, it is designed so that the positioning means for both operating members and the operation control mechanism of the sewing machine can be used for this purpose. The goal is to provide equipment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an apparatus embodying the present invention will be described below with reference to the drawings.

In the figure, 1 is a main shaft of the sewing machine supported on a sewing machine frame 2, 3 is a band wheel fixed to the end of the main shaft, 4 is an electric motor for driving the main shaft 1, and a motor pulley 5
The main shaft 1 is driven via a belt 7 that is hung between the main shaft 1 and a drive pulley 6 fixed to the main shaft 1.

Reference numerals 8, 9, and 10 indicate speed setting push buttons for pre-selecting and setting the rotational speed of the motor 4, and these buttons, along with the release push button 11, are arranged in front of the column of the sewing machine.

Reference numeral 12 denotes a sieve plate fixed to the front surface of the pedestal, 13 a first manual operation knob for amplitude adjustment fixed to a shaft 14 rotatably supported by the sieve plate 12, and 15 a first manual operation knob 13 for adjusting the amplitude.
The adjustment plate 16 is fixed to the shaft 1 and the IH so as to rotate together with the shaft 14, and the adjustment plate 16 is an operating arm loosely fitted to the shaft 14.
7 is operatively connected to a known needle bar link (not shown), and the rotation of the actuating arm 16 about the axis 14 moves the needle bar link, causing the needle bar link to move. By changing the distance between the supported rollers and the pivot point of a known pivot link (not shown), the amount of pivoting momentum imparted to the needle bar can be varied.

Further, an engaging pin 18 is implanted in the operating arm 16, and a forked portion 16a is formed.
; is opposed to the protrusion 15a formed on the adjustment plate 15.

Reference numeral 19 denotes a linkage lever rotatably supported on a shaft 20 fixed to the sieve plate 12r, and a pin 2 implanted at one end of the linkage lever 19.
1 is fitted into the forked portion 16a of the actuating arm 16, and due to the action of a tension spring 22 stretched between it and the sieve plate, the linking lever 19 is moved in the counterclockwise direction shown in FIG. , thereby imparting a rotational force to the operating arm 16 in the clockwise direction in the figure t.

Therefore, the engagement pin 18 comes into contact with the protrusion 15a of the adjustment plate 15, and urges the adjustment plate 15 together with the shaft 14 and the first manual operation knob 13 in the clockwise direction in the figure. The manual operation knob 13 is configured to be held at an arbitrary rotational position t against the biasing force t by a locking means similar to the second manual operation knob described later. The arm 16 also has the engagement pin 18 and the adjustment plate 1.
5, and subsequent rotation is regulated.

Therefore, when the manual operation knob 13 is now rotated, the adjustment plate 15, the actuating arm 15, and the actuating arm 16 rotate together, and the position of the roller relative to the fulcrum of the oscillating link is adjusted as described above. The swinging link, rollers, connecting rod 17, actuating arm 16, etc. constitute an amplitude adjusting device.

Further, reference numeral 23 denotes a shaft 2 rotatably supported by the sieve plate 12.
A second manual operation knob for adjusting the feed amount fixed at 4;
Reference numeral 25 denotes a feed adjustment cam body fixed to the shaft 24 so as to rotate integrally with the knob 23;
5 is formed with a cam surface 25a for setting the normal feed amount and a cam surface 25b for setting the reverse feed amount corresponding to the cam surface.

Reference numeral 26 denotes a plate fixed to the back side of the sieve plate 12 by screws 27, and a locking pin 28 is fixed to the tip of the plate, and the locking pin 28 penetrates through the sieve plate 12 and connects the The second manual operation knob 23 is engaged with a knurling formed on the back side of the second manual operation knob 23 to hold the knob 23 in an arbitrary rotating position, and the first manual operation knob 13 has a similar structure. have.

Furthermore, 29 is a bracket fixed to the frame of the sewing machine, 30
32 is a feed control arm that is rotatably supported by the step screw 31, and is fixed to the lever 30 through the screw 331. Rotates together with the lever.

An engagement pin 34 that can be relatively engaged with the cam surfaces 25a and 25b of the feed adjustment cam body 25 is implanted at the tip of the feed control arm 32.

35 is a feed adjustment shaft rotatably supported by the sewing machine frame and the bracket 29, 36 is a known feed adjustment member fixed to one end of the shaft, and 37 is the other end 1 of the shaft 35.
3 is a rod that connects the connecting arm with the feed control lever 30; 39 is a coiled spring wound around the feed adjustment shaft 35; The engaging pin 34 of the feed control arm 32 is rotated in the direction of the feed adjustment cam body 25.
The cam surface 25a of the cam surface 25a of FIG.

Therefore, when the second manual operation knob 23 is rotated, the feed adjustment shaft 35 is rotated by the feed adjustment cam body 25, the feed control arm 32, the feed control lever 30, the rod 38, and the connecting arm 37. The feed adjustment member 36, the feed control lever 30,
The feed control arm 32, the feed adjustment cam body 25, etc. constitute a feed adjustment device.

Note that the operational connection between the feed adjustment body 36 and the feed dog is well known and will therefore be omitted.

Reference numeral 40 denotes a manual operation lever located above the jaw of the sewing machine so that it can be operated from the front side of the sewing machine, and is fixed to the front end of a shaft 41 rotatably supported on the sewing machine frame. A connecting arm 42 is fixed to the rear end side of 41.

43 is a step screw 45 attached to a support arm 44 fixed to the sewing machine frame.
The operating arm is rotatably attached to the operating arm, and one arm is connected to the connecting arm 42 by a link 46, and an operating projection 43a and a fitting hole 43b are formed in the thin arm.

Reference numeral 47 denotes a switching arm rotatably attached to the support plate 44 through the step screw 45, and a shaft pin 48 having first to third shaft cylinder portions 48a to 48c is fixed to one arm. , the 20th shaft cylinder portion 48b comes into contact with the upper edge of the fitting hole 43b of the operating arm 43 due to the action of a pull spring 49 stretched between the thin arm l and the operating arm 43, Normally, the operating arm 43 and the switching arm 47 rotate integrally in this state.

Reference numeral 50 denotes a bar switching lever which is rotatably attached to the sewing machine frame 2 (this lever is rotatably attached to the sewing machine frame 2 by a step screw 51 at the intermediate portion thereof, and the third shaft cylinder portion 48 of the shaft pin 48 is connected to the forked portion 50a formed at one end thereof.
c is fitted, and the switching lever 50 is biased clockwise in FIG. 2 by the action of a pull spring 52 stretched between it and the sewing machine frame.

Therefore, a rotational force is applied to the switching arm 47 and the operating arm 43 in the counterclockwise direction in the figure, and one side edge of the operating arm 43 comes into contact with the bent portion 44a formed on the supporting plate 44. This makes it impossible to rotate counterclockwise beyond the position shown in FIGS. 2 and 4.

Reference numeral 53 denotes a locking arm 55 attached to the support plate 44 by a mounting shaft 54 so as to be rotatable and tiltable around the shaft.
The winding wound around the mounting shaft 54 is sprung between the locking arm 53 and the support plate 44, and as shown in FIG. , the other end extends along the locking arm 53 and is locked to an inclined portion to be described later, which applies a clockwise rotational force to the locking arm 53 in the clockwise direction in FIG. It is biased in the direction of the arrow in Figure 6.

Therefore, the locking arm 53, as shown in FIG. As shown in FIG. 6, the head of the mounting shaft 54 is in contact with the head and is always held parallel to the operating arm 43 and the switching arm 47, and in this state, one side of the locking arm 53 The edge is arranged so that it can be relatively engaged with the first shaft cylinder portion 48a of the shaft pin 48.

The switching arm 47 is attached to one side edge of the locking arm 53.
When the shaft is rotated clockwise from the state shown in FIG. an inclined edge 56 for rotating the shaft pin 4 over the inclined edge;
8 is a guide edge 57 that engages when the switching arm 47 continues to rotate clockwise, and can be engaged with the first shaft cylinder portion 48a following the guide edge 57 (see FIG. 15). A locking edge 58 is formed to restrict further rotation of the switching arm 47.

59 is an engagement groove whose tip is located between the inclined edge 57 and the guide edge 58, and when the switching arm 47 is rotated counterclockwise from the state shown in FIG. It comes into contact with the first shaft cylindrical portion 48a, prevents the switching arm 47 from returning to the position shown in FIG.
3 is shown in FIG. 13 from the position shown in FIG. 15.

It is allowed to rotate to this position by the action of the coil spring 55.

The first shaft cylindrical portion 48 is attached to the inner edge of the retaining groove 59.
By engaging the locking arm 53, further rotation of the locking arm 53 is prevented and the locking arm 53 is held in the state shown in FIG. 13.

Reference numeral 60 denotes a guide groove following the retaining groove 59, which allows the switching arm 47 to be rotated again from the position shown in FIG. 13 to the position shown in FIG. 14; By engaging the first shaft cylinder portion 48a, the subsequent switching arm 4
7 is prevented from rotating clockwise.

Reference numeral 61 denotes an inclined portion located above the right edge t of the guide groove 60, and as shown in FIG. 6, the tip thereof is inclined in a direction away from the switching arm 47 and the operating arm 43. .

Therefore, when the switching arm 47 is rotated back counterclockwise from the state shown in FIG. The switching arm 47 is tilted in a direction opposite to the direction of the arrow shown in FIG. 6 against the action, and the switching arm 47 is allowed to rotate back to the position shown in FIG.

Note that 62 is a bent portion formed on the other side edge of the locking arm 53, and as is clear from FIG. 6, the operating arm 43
It stands upright in the direction 1, and has an inclined surface formed at its tip, and is arranged so as to be able to operatively engage with the operating protrusion 43a of the operating arm 43, as will be described later.

The manual operation lever 40 is provided with the manual operation lever 40 shown in FIGS.
As is clear from the figure, a switching body 77 is attached.

That is, the front end surface E of the lever 40 has a beginning 40a along the longitudinal direction t, and a long hole 40b passing through the beginning is formed, so that the operating portion 7 of the switching portion body 77
7a is fitted with the starting 40al, and the shaft portion 77
b extends rearward through the elongated hole 40b, and is attached by a retaining ring 78 and an elastic thin plate 79 to prevent it from coming off.

Therefore, the switching part body 77 can move relative to the manual operation lever 40# along the start 40a, and its movement range is caused by the shaft part 77b coming into contact with both end surfaces of the elongated hole 40b. is regulated.

Furthermore, an abutment pin 80 is installed in the sewing machine frame 2,
When the manual operating lever 40 is rotated clockwise with the switching body 77 located at the leftmost position as shown in FIGS. 7 and 8, the shaft portion of the switching body 77 77b comes into contact with the contact pin 80, and then the manual operation lever 40
The rotation in the same direction is prevented, and the above-mentioned 15th
The situation shown in the figure corresponds to this case.

Then, when the switching part body 77 is moved to the rightmost position, which is opposite to the above, when the iron is rotated, the shaft part 77b and the abutment pin 80 do not come into contact with each other, and manual operation is performed. The lever 40 can be rotated one turn so that the first shaft cylindrical portion 48a of the shaft pin 48 comes into contact with the locking edge 58 of the locking portion 53.

Therefore, the manual operating lever 40 is at the position P1.FIG. 2 and FIG. 7E. It is possible to selectively move to P2P3 and another position P4.

Further, referring to FIGS. 2 and 3, reference numeral 63 denotes an actuating lever rotatably attached to the bracket 29 by a pivot 64, and the tip 63a of one arm thereof is attached to the linking lever 19.
It faces the other end 19a from above, and the tip of the thin arm is connected to the other end of the switching lever 50 by a land 65.

Also, the operating lever 63f has an eccentric roller 66 connected to the screw 67.
When the operating lever 63 is rotated counterclockwise in FIG. 3, the peripheral edge of the eccentric roller 66 engages with the lower edge of the feed control lever 30, thereby controlling the feed control lever. This is to rotate the control lever 30 in the same direction.

Reference numeral 68 denotes a rotating lever that is rotatably fitted loosely on the feed adjustment shaft 35 and is connected to the operating lever 63 by a rod 69.

70 is a mounting plate fixed to the sewing machine frame, 71 is a pivot 72
The switch actuating cam body is rotatably mounted on the mounting plate 70 by the rod 73, and the rotary lever 6 is rotated by the rod 73.
It is connected to 8.

Reference numerals 74 to 76 denote three switches, which will be described later, which are fixed in parallel to the mounting plate 70, each of which has an actuator that can be attached to the lower side of the switch actuating cam body 71. It is constructed so that it can be operated sequentially from a cam portion 71at formed on the side.

Further, referring to FIGS. 10 and 11, a rotating shaft 81 is rotatably attached to the bottom of the sewing machine frame 2, and a cylinder 82 having a slot 82a is fixed to the front end of the rotating shaft 81. There is also a tri-arm-shaped switching arm 83 on the rear end side.
are firmly fixed and loosely fitted so that the connecting arm 84 does not move in the axial direction.

One arm 83a of the switching arm 83 is formed with a bent part 83d that extends upward t and faces the right edge of the upright part 84a of the connecting arm 84, and the other two arms 83b and 83c extend left and right. Due to the action of a coiled spring 85 wound around the rear end of the rotating shaft 81, the switching arm 83 is urged clockwise in FIG. The extended arm 83b remains stationary since it comes into contact with a part of the sewing machine frame.

The connecting arm 84 extends to the left as shown in FIG. 2, and is connected to the tip of the operating lever 65 by a rod 86 as shown in FIG.

Further, reference numeral 87 is a knee operating member (see Fig. 1), and a retaining pin 88 is fixed to the tip of its shaft portion 87a.
The knee operating member 87 is located at the throat t'82a of the cylindrical body 82.
By fitting the engagement pin 88 into the holder, the holder is removably attached.

Therefore, when the knee operating member 87 is operated to the right in FIG. 1, the rotation shaft 81 is rotated counterclockwise in FIG. 10.

Next, an embodiment of the electric circuit will be described with reference to FIG.

P and N are AC busbars connected to the AC power supply, and this busbar P
, N is connected with a motor drive circuit formed by connecting in series a sewing machine motor 4 for driving the main shaft of the sewing machine such as a commutator motor and a cyrisk 90 for controlling the supply of electric power to this motor. There is.

A protective variable valve 91 is connected in parallel to this cyrisk 90, and a parallel circuit consisting of a resistor 92 and a capacitor 93 is connected between the gate and cathode of the cyrisk as means for preventing erroneous ignition.

Furthermore, a signal level setting circuit for setting the signal level of the trigger signal to the thyristor 90 is connected between the buses P and N via a second thyristor 94, and this setting circuit includes a plurality of A series circuit consisting of resistors 95 to 100 and diodes 101 and 102, and the resistor 97
and 98 and the slider 99a of the resistor 99.

Further, the midpoint between the resistors 99 and 100 and the resistor 10
speed setting selection switches 103 to 105 each having one end connected to the slider 100a of 0; and the resistor 9;
A phase shifting capacitor 106 connected in parallel to 8 to 100 series circuits, and the selection switches 103 to 105.
A switching device having a contact a connected to the other end and a contact a directly connected to the slider 100a of the resistor 100, and a fixed contact connected to the gate of the thyristor 90 via diodes 107 and 108. It is composed of a switch 74.

As shown in FIG. 1, the selection switches 103 to 105 have a release leg button 1 located in front of the leg column of the sewing machine.
Speed setting pushbuttons 8, 9, 1 arranged with 1
It is selectively closed by a pressing operation of 0.

Further, between the bus lines P and N, resistors 109 and 110 are connected in series through the diode 102, and between both ends of the resistor 110 is a diode 111, and a changeover switch connected to the connected side. 75 and capacitor 11
Two series circuits are connected.

The other contact a of the changeover switch 75 is connected to a resistor 1.
03 and a diode 114 to the gate of the second thyristor 94.

Further, a transistor 115 is connected in parallel to the series circuit G of the resistors 97 to 100 and the diode 101 to form a bypass circuit, and its base is connected to the three resistors 116 to 118 arranged in parallel with each other. are connected to each other, and the other terminals of each of these resistors are connected to the bus line N via the diode 102.
The sliders 116a, 117a, 118a of the resistors 116 to 118 are connected to the switches 119 to 121, the transistor 122, and the resistor 123, which are opened and closed in conjunction with the selection switches 103 to 105, respectively.
It is connected to the contact a of the changeover switch 75 via.

A series circuit consisting of a resistor 124, a capacitor 125, and the diode 102 is connected between the contact a and the bus line N.

Furthermore, a capacitor 126 is connected between the connection point of the resistors 96 and 97 and the gate of the second thyristor 94.
, a resistor 127, and a diode 128 are connected, and a changeover switch 76 is connected between the capacitor 126 and the resistor 127 and the resistor 9596.
A diode 129 with the illustrated polarity is connected through the switch 76, and the other contact of the changeover switch 76 is connected through a resistor 131 to the base of a second transistor 130 connected between the base and emitter of the transistor 115. It is connected.

Furthermore, another transistor 132 is connected in parallel to the changeover switch 75 connected to the contact point via a diode 133, and its base is connected to the collector of the transistor 115 via a resistor 134.

Yet another transistor 135 connects the diode 10 between the base of the transistor 132 and the bus line N.
2, and its base is connected to the selection switches 103 to 105 via a resistor 136.

Further, a transistor 137 is connected between the base of the transistor 122 and the bus line N via the diode 102, and its base is connected to the emitter of the transistor 132 via a resistor 138.

In addition, 139 is a protective resistor connected between the base and emitter of the transistor 130, 140 is a resistor connected between the base of the transistor 122 and the contact a of the changeover switch 75, and 141 is the bus line P, N. A noise prevention capacitor is connected between them, 142 is a power switch, and 143 is a lamp.

Further, a parallel circuit of a resistor 144 and a capacitor 145 is connected between the gate and cathode of the second thyristor 94 as means for preventing erroneous firing.

As is clear from the above description, the three changeover switches 74 to 76 are switched in conjunction with the operation of the manual operation lever 40, and the first changeover switch 7
4 switches to the contact a side when the manual operation lever 40 is moved to position P2 for normal sewing machine operation;
When it is operated to any other position, it is connected to the contact side.

The second and third changeover switches 75 and 76 are connected to the contacts only when the manual operation lever 40 is located at position P1 for stopping the operation of the sewing machine, and are connected to the contacts when the manual operation lever 40 is moved to other positions. This is to switch to the a side.

The operating mode of the embodiment device configured as described above will be explained.

2 to 12 show the state when the manual operation lever 40 is located at the sewing machine stop position P1 and the operation of the sewing machine is stopped, and the release push button 11 shown in FIG.
is pressed, and the selection switches 103 to 105 and the interlocking switches 119 to 121 shown in FIG. 12 are all opened.

In addition, the adjustment plate 15, the operating arm 16, shown in solid lines in FIG.
The position of the connecting rod 17 etc. is such that the first manual operation knob 13 is the first
This figure shows a state in which the needle bar is rotated to the maximum clockwise direction and the swing amplitude of the needle bar is set to the maximum. The position shows the state where the cloth feed amount is set to the medium feed amount, but as mentioned above, these settings can be changed arbitrarily by operating the first and second manual operation knobs 13 and 23. It is possible.

When the power switch 142 is closed in FIG. 12, a lamp 143 disposed inside the sewing machine head lights up, and the sewing machine user senses that the power has been turned on.

Then, in order to set the operating speed of the sewing machine to high speed, medium speed, or low speed, push button 8 for speed setting shown in FIG.
9. If the push button 8 for high speed setting is suppressed in any one of 9.10, the push button 8 is held in the pressed state by appropriate means, and the selection switch 103 for speed setting is closed. At the same time, the interlock switch 119 is closed.

Therefore, in order to operate the sewing machine, the manual operation lever 40 is moved to the second position.
When the operating arm 43 is rotated clockwise from position P1 in the drawing, the operating arm 43 is rotated in the same direction, and the upper edge of the fitting hole 43b presses the second shaft cylinder portion 48b of the shaft pin 48, causing switching. Arm 47 is also rotated in the same direction.

As a result, the switching lever 50 is rotated counterclockwise in FIG. 2 against the action of the tension spring 52, and the rod 65
The actuating lever 63 is rotated via the rod 692 and the rotating arm 68. Switch actuating cam body 7 via rod 73
1 rotates.

When the manual operating lever 40 reaches the rotational position P2, the switch 74 is activated by the switch operating cam body 71.
, 75, 76 are pressed, and the switches 74 to 76 are switched to the contact a side in FIG.

The fact that the manual operation lever 40 has reached the rotational position P2 occurs when the first shaft cylindrical portion 48a of the shaft pin 48 crosses over the inclined edge 56 of the locking arm 53 and comes into contact with the guide edge 57. The sudden change in the rotational resistance of the manual operation lever 40 and the abutting sound are detected by the operator, and if the lever 40 is released at that point, the first shaft is rotated as shown in FIG. The state in which the cylindrical portion 48a is engaged with the upper edge of the engagement groove 59, that is, the manual operation lever 40 is in the rotation position P in FIG.
2 against the action of the tension spring 52.

In this state, the tip 63a of the operating lever 63 also does not engage the end 19a of the link lever 19.

Therefore, by switching the switches 75 and 76 to the contact a side, the capacitor 112 that has been charged up to that time is
is input to the gate of the second thyristor 94 via the resistor 113 and the diode 114, the thyristor becomes conductive, and the capacitor 126 is connected to the resistor 95 and the diode 12.
It is charged via 9.

On the other hand, the electric charge of the capacitor 112 is transferred to the resistor 123, the transistor 122, the motion switch 119, and the resistor 116.
The signal is input to the base of the transistor 115 through the transistor 115, and this transistor is turned on.

Therefore, due to conduction of the second thyristor 94, the bus line P
The current flowing from the signal level setting circuit t to the signal level setting circuit t initially hardly passes through the series circuit of the resistors 97 to 100, detours to a bypass circuit mainly composed of the transistor 115, and flows through the diode 102 to the mother MN.

Then, as the discharge of the capacitor 112 progresses, the input to the base of the transistor 115 decreases, and the current flowing through the bypass circuit gradually decreases, and instead flows through the series circuit of the resistors 97 to 100. When the current gradually increases and the discharge of the capacitor 112 is almost completed, the transistor 115 is turned off and the bypass circuit is cut off.

Therefore, the trigger signal to the first thyristor 90 by the signal level setting circuit is extremely small immediately after the switches 74 to 76 are switched to the contact a side, and does not cause the thyristor 90 to conduct. Gradually, the signal level rises to make the si-risk 90 conductive, and power is supplied to the electric motor 4 to start the motor.

As the conduction angle of the thyristor 90 widens, the rotation speed of the motor 4 increases, and when the transistor 115 turns off, the selection switch 10, which is selectively closed in advance,
The trigger signal of the level set by 3 is CyRisk 9
0, and the motor 4 reaches a predetermined rotational speed.

By the way, since the capacitor 126 is charged when the second thyristor 94 is conductive, the capacitor 11 described above is charged.
When the discharge of the second thyristor 94 is almost completed, the charge of the capacitor 126 is input to the gate of the second thyristor 94 through the resistor 127 and the diode 128 instead of the capacitor, and this thyristor is kept in a conductive state.

When the thyristor 94 has a constant conduction, it is maintained in a conductive state until the sewing machine stops, that is, the changeover switches 75 and 76 return to the contact side, and during this time the capacitor 12
6 is one that repeats charging and discharging.

Therefore, after the transistor 115 is turned off, the motor 4 is driven to constant rotation at a rotation speed preset by the speed setting push button 8.

When the sewing machine is operated in this manner, the desired sewing work is performed with the amplitude and cloth feed amount set by the first and second manual operation knobs 13.23. If push button 9 or 10 is pressed,
The selection switch 103 and movement switch 119 are opened, and the selection switch 104 or 105 is closed together with its interlocking switch 120 or 121,
A trigger signal at a lower level than in the case described above is input to the Sairisk 90, and the motor 4 is driven at a corresponding rotational speed (medium speed or low speed).

At this time, since the capacitor 112 has been discharged, the transistor 115 remains off.

Then, when the manual operation lever 40 is rotated back from the rotational position P2 to the original position P1, the switch 76 returns to the contact side, and when the discharge of the capacitor 126 is completed, the input to the second thyristor 94 is activated. is cut off, the power supply to the motor 4 is cut off, and the sewing machine stops.

Further, the changeover switch 75 returns to the contact side, and the capacitor 112 is charged.

The manual operation lever 40 is rotated back to the original position P1 in the following manner.

That is, when the manual operating lever 40 is rotated from the state shown in FIG. 13, the operating arm 43 is rotated counterclockwise in the figure independently of the switching arm 47, and the operating protrusion 43a is rotated against the locking arm. 53 from below (see FIG. 16), and moves the locking arm 53 backward (to the right in FIG. 6) against the action of the coil spring 55.

Therefore, the first shaft cylindrical portion 48a of the shaft pin 48, which had been locked in the engagement groove 59 of the locking arm 53, disengages from the engagement groove 59, and the tension spring 49 Due to this action, it passes over the front surface of the locking arm 53.

Therefore, when the manual operating lever 40 is rotated back to the original position P1, the operating arm 43 and the switching arm 47 return to the positions shown in FIGS. 2 and 4, and the switching lever 50° operating lever 63, The switch actuating cam body 71 etc. are also shown in Figs. 2 and 3.
The changeover switches 74 to 76 return to the position E shown in FIG. 12 (FIG. 12).

When sewing a new sewing location, one of the push buttons 8 to 10 is pressed to set the motor speed to a desired rotational speed t, and selection switches 103 to 1 are pressed.
05 and rotates the manual operation lever 40 again to position P2, the switches 74 to 76 operate in the same way as described above, and the level of the trigger signal to the first thyristor 90 changes to the level of the capacitor. The motor 4 gradually increases its rotation speed in accordance with the discharge of the motor 112, and the motor 4 gradually increases its rotation speed in the same way as when a conventional controller is gradually depressed. Rotationally driven.

Incidentally, in the present embodiment, the manual operation lever 40 is configured so that it can also be moved to the rotational position P3 shown in FIG. It works.

That is, when starting sewing, the switching member 77 is operated to the left as shown in FIG. 8, and then the manual operation lever 40 is moved from the sewing machine stop position P1 to the sewing machine operating position P2.
If the rotation operation is performed beyond the
b is rotated to a position P3 where the rear end is in contact with the contact pin 80, and the operating arm 43 and the switching arm 47 are moved to the state shown in FIG. 14.

In this state, the first shaft cylindrical portion 48a of the shaft pin 48 does not engage with the locking edge 58 of the locking arm 53, and is held in that position while the lever 40 is pressed from above.

The switching lever 50 is rotated counterclockwise in FIG. 2 to its position P3, and the operating lever 63 is rotated counterclockwise in FIG. Rotated.

As a result, the eccentric roller 66 comes into contact with the lower edge of the feed control lever 30 and rotates the lever in the same direction, causing the rod 38 to rotate.
, via the connecting arm 37) The adjustment shaft 35 is connected to the coiled spring 39.
It is rotated together with the feed adjustment member 36 against the action of the feed adjustment member 36.

As a result, the feed adjustment member 36 is changed to a suitable state, for example, a minute forward feed amount or a minute backward feed amount, so that one piece of work cloth can be applied by the feed dog.

At this time, since the engagement pin 34 of the feed control arm 32 moves in the direction away from the normal feed cam surface 25a of the feed adjustment cam body 25, the setting operation of the second manual operation knob 23 is disabled. .

Further, the rotational position of the feed adjustment member 36 can be adjusted by rotating the eccentric roller 66.

On the other hand, the tip 63a of the rotation F of the operating lever 63
presses the end 19a of the linking lever 19 from above, and rotates the lever 19 to the position shown in two-dot chain line in FIG.

Therefore, the operating arm 16 is rotated from the solid line position B to the two-dot chain line position A) regardless of the adjustment plate 15, and the needle bar is rotated through the connecting rod 17 regardless of the setting operation of the first manual operation knob 13. Align the rollers of the connecting rod with the swinging fulcrum of the swinging link, and change the swinging amplitude of the needle bar to zero.

Furthermore, due to the rotation of the operating lever 63, the switch operating cam body 71 is rotated as described above, and each switch 7 is rotated.
4,75.76 operates as follows.

That is, the manual operation lever 40 is in the second position P described above.
2, the changeover switch 74 is temporarily switched to the contact a side, but immediately returns to the contact side.

Further, other changeover switches 75 and 76 are set to the second position P.
After passing through 2, it is maintained connected to the contact a side.

Therefore, when the manual operation lever 40 is moved to the third position P3, even if the selection switch 103 for high speed setting is closed, the selection switch 105 for low speed setting is closed. As in the case, the motor 4 will be driven at low speed.

At that time, by connecting the switch 75 to the contact a side,
As before, the charge on the capacitor 112 is transferred to the transistor 1.
15, the transistor is turned on and the bypass circuit is activated, and as mentioned above, the so-called slow start phenomenon occurs in which the rotational speed of the motor 4 gradually increases, and then the motor runs at a predetermined speed. Rotationally driven at low constant speed.

As described above, the manual operation lever 40 is in the third position P.
3, the first manual operation knob 13
The swing amplitude of the needle bar is changed to zero regardless of the setting state of t, and the fabric feed amount is adjusted to a feed amount suitable for tacking stitches (micro feed) regardless of the setting state of the second manual operation knob 23. and push buttons 8 to 10 for speed setting.
This is changed so that the motor 4 is driven at a low speed regardless of the speed selection setting state, so that tacking can be easily performed at a low speed.

After performing the required tacking stitches as described above, when the pressure on the manual operation lever 40 is released, the switching lever 50 is rotated by the action of the pull spring 52, and the switching arm 47 and the operating arm 4 are rotated.
The third and other parts move to the state shown in FIG. 13, and the first shaft cylindrical portion 48a of the shaft pin 48 engages with the engagement groove 59 of the locking arm 53 and is held in that state.

At this time, the manual operating lever 40 is moved and held at the second position P2, and the operating lever 63 and switch operating cam body 71 are also moved to corresponding positions.

Therefore, the changeover switch 74 is connected to the contact a side and is driven to rotate at a preset speed, but at this time, the capacitor 112 has completed discharging, and there is no possibility that the sewing machine will temporarily stop. do not have.

Further, the actuating arm 16 returns to the preset position from the first manual operation knob 13t, the feed adjustment body 36 also rotates back together with the feed control lever 30, the feed control arm 32, etc., and the retaining pin 34 The feed adjustment cam body 25 is kept in contact with the normal feed setting cam surface 25a (this state is maintained).

Therefore, the first and second manual operating knobs 13.23i
This makes it possible to perform desired sewing at a preset swing amplitude and cloth feed amount, and at a preset speed using the push buttons 8 to 10.

When the sewing is completed, if the manual operation lever 40 is moved to the first position P1 as described above, the power supply to the motor 4 is cut off and the sewing machine stops at the normal position. If you want to perform tacking at the end of sewing,
The manual operation lever 40 may be moved from position P2 to position P3 again.

As a result, the operating arm 43 and the switching arm 47 move to the position shown in FIG. The tacking stitch can be performed using the sewing machine.

At this time, the first shaft cylinder portion 4 of the shaft pin 48 of the switching arm 47
8a does not come into contact with the lower edge of the guide groove 60 of the locking arm 53, as shown in FIG.
7b engages with the abutting pin 80, further rotation is prevented, whereby the manual operation lever 40
The position P3 is exactly the same as the position corresponding to the state shown in FIG.

After performing the required tacking stitches, the manual operation lever 40
When the suppression is released, the switching arm 47 rotates under the action of the tension spring 52, and the first shaft cylindrical portion 48a of the shaft pin 48 rotates.
contacts the inclined portion 61E of the locking arm 53, and the locking arm 53 is tilted against the action of the coil spring 55.

Therefore, the shaft pin 48 moves without being locked by the locking arm 53 and returns to the position shown in FIG. 4t.

Therefore, the manual operation lever 40 is moved to the second position P2.
, and returns to the first position P1, and the sewing machine stops at the final position.

At that time, since the lever 40 passes through the second position P2, the changeover switch 74 is temporarily switched to the contact a side.
Since it is instantly reconnected to the contact point, the motor 4 does not rotate at high speed, and then, as described above, the single switch 76 is connected to the contact side, and the power supply to the motor 4 is cut off. It is something that will be done.

As is clear from the above explanation, when the manual operation lever 40 is depressed from the first position P1 for stopping the sewing machine, beyond the second position P2, to the third position P3, sewing starts. When the lever 40 is released, the manually operated lever 40 returns to the second position and is held at that position, allowing normal sewing work to be performed. Then, by pressing the lever 40 again to move to the third position P3, the tacking stitch at the end of sewing can be performed at a low speed, and by releasing the pressure on the operating lever 40, it moves to the second position P3. The manual operation lever 40 can be operated according to a series of programs.

In addition, if you wish to omit the above-mentioned tacking stitch at the start of sewing, move the manual operation lever 40 from the first position P1 to a position beyond the second position P2, and then move the manual operation lever 40 to the third position P3. It is sufficient to release the lever 40 before reaching the position P21, whereby the lever 40 is held in the second position P21.

Furthermore, if it is desired to omit the tacking stitch at the end of sewing, the manual operating lever 40 may be forcibly moved from the second position P2 toward the first position P1. is rotated independently of the switching arm 47 due to the presence of the fitting hole 43a, and the locking arm 5 of the switching arm 47 is rotated by the cooperative action of the operating protrusion 43a and the bent portion 62 of the locking arm 53.
3 is released, and the manual operation lever 4
0 returns to the first position P1.

Then, the switching member 77 attached to the manual operation lever 40 is moved to the right in FIGS. 40, the second manual operation knob 2
3 allows linear reverse stitching to be performed with a reverse feed amount equal to the normal feed amount set in advance.The operating mode of 1 will be described below.

That is, when the manual operation lever 40 is rotated further after passing through the position P2, since the shaft portion 77b of the switching member 77 is in a position where it does not contact the contact pin 80, it is further rotated beyond the position P3. It can be rotated.

Therefore, the switching lever 50 is rotated further than in the case of the above-mentioned fixing stitch, and the engagement pin 34 of the feed control arm 32 engages with the reverse feed cam surface 25b of the feed adjustment cam body 25.

In this state, further rotation of the manually operated leno' 40 is prevented, and the feed adjustment unit 36 is adjusted to a reverse feed amount equal to the normal feed amount preset by the second manual operation knob 23. is rotated to set.

At that time, the actuating arm 16 is activated via the link lever 19 as shown in FIG.
Although it will not be possible to rotate further counterclockwise from the position shown by the dashed-dotted line, the connecting rod 17 is divided into two parts, the upper part of the connecting rod absorbs the interlocking movement, and the needle bar connecting rod and the roller (both There will be no problem if the sewing machine is configured so that the sewing machine (not shown) is held at the same position as that at the time of the tacking sewing.

When the manual operation lever 40 is rotated in this way,
The changeover switches 74 to 76 operate in the same manner as when the above-mentioned lock stitching is performed, that is, when the manual operation lever 40 is operated to position P3, and the backward movement is the same as the forward cloth feed preset by the second manual operation knob 23. Straight backstitching can be performed at low speed in the bloodstream.

Therefore, the locking edge 58 of the locking arm 53 and the guide groove 60 in FIG. 4 are such that when the second manual operation knob 23 is maximally rotated clockwise in FIG. The manual operation lever 40 is in position P in a preset state.
3, the engagement pin 34 of the feed control arm 32 shown in FIG. 3 engages with the opposing reverse feed cam surface 25b). The manual operation lever 40 can be rotated to position P4.

Furthermore, in the present embodiment, the operation and stopping of the sewing machine can also be controlled by the knee operating member 87.

That is, when the operation or stopping of the sewing machine is controlled by operating the manual operating lever 40, the connecting arm 84 is rotated counterclockwise from the solid line position in FIG. 10 t as the operating lever 63 moves. However, the switching arm 83 does not rotate at all, and even if the knee operating member 87 is attached, the switching arm 83 does not rotate at all.
7 never moves.

Now, when the knee operating member 87 is rotated in the counterclockwise direction in FIG. The bending portion 83d of the switching arm 83 engages with the right edge of the upright portion 84a of the connecting arm 84, thereby moving the connecting arm to the tenth position.
Rotate counterclockwise in the figure.

The rotation is such that the right arm 83c of the switching arm 83 is connected to the sewing machine frame 2.
The movement of the connecting arm 84, which is regulated by coming into contact with a part of the lever from below, rotates the operating lever 63 via the rod 86, and further rotates the switching lever 50 via the rod 65 counterclockwise in FIG. rotated in the direction.

Therefore, the switching arm 47 having the shaft pin 48 is rotated, and its second shaft cylinder portion 48b comes into contact with the lower edge of the fitting hole 43b of the operating arm 43, causing the operating arm 43 to rotate. The manual operation lever 40 is also rotated.

When the knee operating member 87 is rotated to the maximum and the connecting arm 84 is moved to the position indicated by the dashed dot line in FIG. When the knee operating member 87 is released, the first shaft cylindrical portion 48a of the shaft pin 48 is locked in the engagement groove 59 of the locking arm 53, as described above, and the manual operation lever 4 is locked.
0 is held at the sewing machine operating position P2.

Further, the knee operating member 87 is operated by the switching arm 8 due to the action of the coiled spring 85.
3, but the connecting arm 84 is returned to the original position with the 10th
After the manual operating lever 40 is rotated slightly clockwise from the position shown by the dashed dotted line in FIG.

As a result of the above-described operation of the knee operating member 87, the switch operating cam body 71 is rotated, similar to when the manual operating lever 40 is moved from position P1 to position P2, and the changeover switches 74 to 76 are rotated. switch to contact a side, motor 4
can be started slowly and normal sewing work can be performed at the speed set by any of the boost buttons 8 to 10.

At that time, the first and second manual operation knobs 13.23
Needless to say, sewing can be performed with a preset amplitude and feed amount.

Then, when the knee operating member 87 is rotated again in the counterclockwise direction in FIG.
8 and rotated slightly clockwise from the position shown in FIG. 13, and the first shaft cylindrical portion 48a moves into the guide groove 60 and faces the inclined portion 61 from below.

When the knee operating member 87 is released, the shaft cylinder portion 48a presses the inclined portion 61 to tilt the locking arm 53, and as described above, the manual operating lever 40 returns to the sewing machine stop position P1. do.

Therefore, all the members return to their original positions and the sewing machine stops.

In this way, the operation and stopping of the sewing machine can also be controlled by operating the knee operating member 87 instead of operating the manual operating lever 40, and in this case, the operator uses both hands to move the work cloth. It can be used for.

It should be noted that with the operation of the knee operation member 57 in this embodiment, it is not possible to perform the above-mentioned tacking stitches or backstitching, but the first
If the left arm 83b of the switching arm 83 shown in FIG. It is clear from the above explanation that this is possible.

Incidentally, when sewing work is performed only by operating the manual operation lever 40, the knee operation member 87 is not necessary, so it can be removed and attached as necessary.

As is clear from the above description, the present invention allows a worker to select and set the speed of an electric motor for driving the main shaft of a sewing machine in advance, and to operate and stop the sewing machine at the set motor speed. The knee operating member that can be moved and operated by the worker's knee is attached to the sewing machine frame t.
The manual operation member is connected so that the manual operation member is moved in conjunction with the operation of the knee operation member, and the operator can start and stop the sewing machine by hand. The sewing machine can be controlled not only by the knee but also by the knee, making it extremely easy to use the sewing machine in any location, and because the knee actuating element is subjected to the action of the positioning means for the manual actuating element, its own positioning relative to the knee actuating element is possible. There is no need to provide a separate means, the structure is simple and it can be manufactured at low cost.Furthermore, if the knee operating member is formed into a rod shape, it is lightweight, easy to attach and detach, and can be stored compactly, and has many practical effects. The present invention provides an operation control device having the following features.

[Brief explanation of the drawing]

The drawing shows an embodiment of the device embodying the present invention.
Fig. 1 is a perspective view showing the external appearance of the sewing machine, Fig. 2 is a front view of the main parts with the sewing machine frame removed, and Fig. 3 is the same as Fig. 2.
Figure 4 is a partially enlarged front view for explaining the positioning mechanism of the manual operation lever, Figure 5 is its top view, Figure 6 is its right side view, and Figure 7 is the manual operation lever. An enlarged front view showing the operating lever, Figure 8 is the same as ■- in Figure 7.
■ Line sectional view, Figure 9 is a sectional view taken along line IX-IX in Figure 8, Figure 10 is a partial front view showing the attachment part of the knee operating member, Figure 11 is
The figures are a partially cutaway top view of FIG. 10, FIG. 12 is an electric circuit diagram, and FIGS. 13 to 16 are side views corresponding to FIG. 4 for explaining different operating modes. In the figure, 1 is the main shaft of the sewing machine, 4 is an electric motor, 8 to 10 are push buttons, 40 is a manual operation lever, 43 is an operation arm, 4
7 is a switching arm, 48 is a shaft pin, 50 is a switching lever, 52 is a tension spring, 53 is a locking arm, 54 is a coil spring, 59 is an engagement groove,
61 is a slope, 63 is an operating lever, 65 is a rod, 68
69 is a rotary lever, 71 is a switch actuating cam body, 73 is a rod, 74 to 76 are changeover switches, 8
1 is a rotating shaft, 82 is a cylindrical body, 83 is a switching arm, 84 is a connecting arm, 85 is a coiled spring, 86 is a rod, 87 is a knee operating member, 8
8 is an engagement pin, and 103 to 105 are selection switches.

Claims (1)

[Claims] 1. An electric motor 4 for driving the main shaft 1 of the basin;
Motor drive circuit 9 for supplying electric power to the motor
0.94, etc., and speed setting means 1 for selectively setting the speed of the motor disposed in its motor drive circuit.
03 to 105, and manual speed selection means 8 to 10 operatively connected to the speed setting means and for preselecting and setting the speed of the motor by operation from outside the sewing machine frame.
and a manual operation member 40 which is operatively connected to the motor drive circuit 90, 94, etc. and can be moved and operated by an operator from outside the sewing machine frame in order to control supply and cutoff of electric power to the motor 4. , at least a first position P1 for stopping the sewing machine by cutting off the power supply to the motor 4 and a second position P1 for supplying power to the motor 4 to operate the sewing machine. P2 and positioning means 48, 52 for selectively holding it on either side.
53.59.61, a knee operating member 87 which is detachably attached to the sewing machine frame and can be moved and operated by the worker's knee, and the manual operating member is moved in conjunction with the operation of the knee operating member. Connecting means 83 to 86 are provided for operatively connecting both operating members, so that the operation and stopping of the sewing machine can be controlled not only by the operator's hands but also by the knee. An operation control device for an electric sewing machine, characterized in that an operating member 87 is subjected to the action of positioning means 48, 52, 53, 59, 61 for a manual operating member 40. 2. The positioning means 48, 52, 53, 59°61 includes a spring means 52 for biasing the manual operation member 40 toward the first position P1, and a spring means 52 for urging the manual operation member 40 toward the first position P1. For holding the manual operating member 40 at the second position P2f when the manual operating member 40 is released after being moved from the first position P1 against the action and reaching the second position P21. Due to the action of the holding means 48 and 59, the manual operation member 40 held in the second position P2) is slightly moved from the second position P2 to the side opposite to the first position P1. and a release means 61 for releasing the manual operation member 40 from the action of the holding means 48,59 and returning it to the first position P1 by the action of the spring means 52 when it is released later. By moving the knee operating member 87 in one direction and releasing the operation, the manual operating member 40 is moved to the second and second positions P1. An operation control device for an electric sewing machine according to claim 1, characterized in that the device selectively moves to two positions corresponding to P2. 3. Claims characterized in that the connecting means 83 to 86 connect both operating members 40.87 so that the knee operating member 87 does not move in conjunction with each other when the manual operating member 40 is operated. An operation control device for an electric sewing machine according to item 1 or 2.