JPS6043993B2 - sewing machine sewing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sewing device for a sewing machine, and particularly to a sewing device that electrically detects the right end and moves the cloth from side to side in a direction intersecting the cloth feeding direction using a moving mechanism that acts on the right end based on the detection signal. This invention relates to a sewing device that automatically keeps the distance from the right end to the needle constant and performs automatic suturing.

In this type of conventional device, in order to accurately feed the cloth to the right edge detection device and the cloth moving device, which are fixedly placed, a cloth guiding device is placed at a fixed horizontal interval in front of these devices in the cloth feeding direction. It was configured.

For this reason, when using this type of device to sew products that have a thick part in the middle of the fabric, such as the side seam of pants, the pocket is sewn in the middle of one side of the fabric, making it thicker. There is a drawback that this type of sewing is virtually impossible because the fabric gets caught in the fabric guide device or the right edge detection device and the fabric cannot be fed, and if the gap between the fabric guide devices is widened so that the thick part of the fabric can pass through, There was a drawback that the right end could not be accurately guided to the cloth detection device, and accurate sewing could not be performed.

The present invention aims to eliminate the above-mentioned conventional drawbacks.

An embodiment of the present invention will be described below with reference to the drawings. Although not shown, a sewing machine is mounted and a pedal that can be operated by foot in the forward and backward directions is arranged below the table. 2 is a schematic plan view thereof, and FIG. 2 is a side view thereof, showing a pair of upper cloth control devices 1 arranged vertically and shifted from side to side in order to detect and move the ends of two cloths separately. It consists of a lower cloth control device 2. FIG. 3 is a perspective view with the upper part of the frame 3 of the upper fabric control device 1 cut away and a part of the cover 4 removed, and 5 is a fixed body whose base is fixed to the upper surface of a bed 6 (not shown). At the same time, a cylindrical portion 7 is integrally formed above. Reference numeral 7 denotes a U-shaped connecting body, which is fixed to the right inner side of the frame 3 with screws 8, 8, and is connected to the frame with respect to the fixed body 5 by a shaft 9 that loosely fits through the cylindrical portion 7 of the fixed body 5. 3 and is rotatably supported.

Reference numeral 10 denotes a spring wound around the shaft 9, one end of which is engaged with the upper surface of the fixed body 5, the other end of which is engaged with the upper right surface of the connecting body 7, and the frame 3 is
A clockwise rotational force is always applied to the shaft 9 around the shaft 9.

Reference numeral 11 denotes a sliding plate, which is supported on the inside lower side of the frame 3 so as to be slidable left and right in a direction perpendicular to the cloth feeding direction, and its left end protrudes outward from the left end of the frame 3.

12 is a rack gear, and the gear 1 is fixed to the upper surface of the sliding plate 11 inside the frame 3 and rotatably supported inside the frame 3.
3 are interlocked.

A gear 14 meshes with the gear 13, is rotatably supported on the frame 3, and one end is fixed to a shaft 15 protruding outward from the frame 3.

Reference numeral 16 denotes a rack support, which is fixed to the outer surface of the frame 3 with screws 17, 17, and has a rack gear 18 on the upper surface.
．． A groove 19 is formed to slidably support the rack gear 1.
8 meshes with a gear 20 fixed to the protruding end of the shaft 15 mentioned above.

21 is a cylinder support plate whose base is connected to the rack support 16
At the same time, the base of the air cylinder 22 is supported at the tip! hold

23 is an interlocking plate whose base is fixed to the rear end surface of the rack gear 18 (not shown) and whose tip is connected to the rod 24 of the air cylinder 22.

As a result, when the air cylinder 22 acts and the rod 24 protrudes to the right, the rack gear 18 slides to the right, rotates the gear 20 and the shafts 15, 14, and 13, and the rack gear 18 slides to the right.
The sliding plate 11 is moved to the right through the air cylinder 22, and the sliding plate 11, on which the air cylinder 22 becomes inactive, is moved to the right. 25 is a well-known electrical cloth edge detection device, and the sliding plate 1
1, and includes an upper cloth detection passage 27 and a lower cloth detection passage which sandwich a reflecting plate 26 extending in the horizontal direction.

Reference numeral 29 denotes a cloth guide device, which is composed of a separating plate 30 whose base is fixed to the sliding plate 11, and an upper cloth guide plate 32 arranged above the separating plate 30 at a distance to form an upper cloth guide passage 31. As shown in the figure, the separating plate 30 extends to the upper surface of the bed to form a lower cloth guide passage 33.

Reference numeral 34 denotes a well-known cloth moving device, which supports a holder 35 inside the frame 3 so as to be rotatable about a shaft 36, and an arm 37.
extends above the separation plate 30.

A servo motor 38 indicated by a two-dot chain line is a servo motor fixed to the back side of the holder 35, which rotates in forward and reverse directions according to the cloth presence/absence signal from the cloth edge detection device. 40 is rotated forward and backward to move the cloth in cooperation with the separating plate 30. 49 is an air cylinder provided within the frame 3, the base of which is supported within the frame 3, and the tip of the rod supported by the holder 35.
The holder 35 is rotated counterclockwise about the shaft 36 by the cloth edge detection signal of the cloth edge detection device 25, and the roller 40 is pressed against the separating plate 30, It presses into contact with the cloth in between, becomes inactive due to the cloth trailing edge detection signal, and moves upward due to the inaction.

Note that the lower cloth control device 2 includes the same parts related to the holder 35 of the upper cloth control device 1, and as shown in FIG. 2, its roller is disposed below the separating plate 30 to move the lower cloth. .

In the figure, 41 is a cloth presser foot, and 42 is a cloth edge guide fixed to the throat plate 43.

Reference numeral 44 shown in FIG. 2 is an air cylinder, whose base is supported by a sewing machine frame (not shown), and whose lower end is opposed to the upper left end of the frame 3 from the axis 9. The moving device 3 is rotated against the spring 10.
4. The cloth guide device 29 and the cloth edge detection device 25 are moved downward to the lower working position, and the frame 3 is rotated clockwise around the shaft 9 by the action force of the spring 10 due to the non-action, and the above-mentioned each The device is placed in an inactive position above and away from the top surface of the head 6.

A thread cutting means 51 having a thread cutting blade 50 that is moved by an air cylinder (not shown) so as to cross over and cut the upper thread connected to the needle and the cloth is fixed to the frame 3. Next, the electric circuit will be explained.

P is an operation detection circuit provided in the pedal, and a variable resistor R whose resistance value is changed by moving the movable element K in relation to the front depression operation of the pedal, and a current control circuit which sets the current to the variable resistor R. A constitutes a speed setting part that sets the sewing machine speed to a speed proportional to the amount of the front pedal depression, and a changeover switch W that closes in connection with the rear depression operation of the pedal constitutes a switching part between automatic specification and manual specification. do.

CPl and CP2 are voltage comparators, each having one input connected to a movable element K of a variable resistor R, and comparing that voltage with a reference voltage serving as the other input. When the output from the setting section reaches the voltage of the first stage corresponding to the initial position of the front pedal depression, an H level output is generated, and the second comparator CP2 generates a voltage of the second stage corresponding to the latter position of the pedal front depression. When the voltage is reached, an H level signal is generated.

FF is a T-type flip-flop, and the T (trigger) force is connected to a pulse shaping circuit E that generates an L-level trigger signal when the changeover switch BSW is closed.

ASW is an analog switch,
(7)' Open when the Q output is at H level to output the output voltage of the speed control section to the speed control circuit °C, and closed when the O output is at L level.

On the input side of gate G1, there is a flip-flop FF (7).
Connect the Q output and the output from the switch TSW to a thread trimmer that is operable at a predetermined position on the sewing machine, and use the rising output when both are at H level as a stop command signal to stop the sewing machine at the needle up position. This signal is used as a thread cutting command signal via the delay circuit L2.

The output of the comparator CPl and the mutual output of the flip-flop FF (7) are connected to the input side of the gate G2, and the rising output when both are at H level is input to the starting circuit MC via the delay circuit L1. .

The output of the comparator CPl and the output of the gate G1 are connected to the input side of the gate G3, and when both inputs are at the L level, a presser foot lifting command signal is sent that raises and holds the presser foot 41 against the elastic force. occurs. The output of the second comparator CP2 and the Q output of the flip-flop FF (7) are connected to the input side of the gate G4, and the rising output when both inputs become H level is used as the action signal of the constant speed control circuit AS. shall be.

D is a drive control circuit, which is a flip-flop FF (7)
The air cylinders 22 and 44 are controlled to be activated when the output is at the L level, and deactivated when the output is at the H level. The constant speed control circuit AS starts the drive motor of the sewing machine in response to the action signal from the gate G4 and controls the speed so that it is driven at a constant speed.

The speed control circuit SC inputs the output voltages from the speed setting units A, R, and K via the analog switch ASW, and based on the voltages, drives the sewing machine drive motor at a speed proportional to the amount of forward depression of the pedal. to control the speed.

The starting circuit MC drives the drive motor of the sewing machine via the delay circuit L1 when the gate G2 goes to the H level, and stops it when the gate G2 goes to the L level. This invention has the above-mentioned configuration. First, when the power is turned on, the flip-flop FR is reset and the Q output is set to L and the O output is set to H, so that the air cylinders 22 and 44 are inactive and the upper cloth is turned on. The cloth guide means 29 and the detection means 25 of the control device 1 are moved rearward to the non-position position and the analog switch ASW is opened.

In this state, when the cloth is placed on the seam part and the pedal is pressed forward, the voltage from the speed setting section via the variable resistor R changes, and an H level output is generated from the first comparator CPl at the beginning of the pressing. , As a result, the gate G3 becomes an H output and the presser foot is lowered, and the comparator CPl is connected to the gate G2.
And flip-flop FF(7)'Q output H is input, and the starting circuit MC drives the sewing machine motor. At this time, since the analog switch is open, the speed control cycle βC is controlled in accordance with the amount of front pedal depression. Drive the sewing machine motor at a speed of Release the pedal and turn the thread trimming switch TS
Even if W is turned on, it is held down by gate G1 and thread cutting is impossible. When the pedal is released and then stepped on again, the changeover switch BSW closes and an SL level changeover signal is generated from the pulse shaping circuit E, and the flip-flop FF (7)
The Q output is set to the automatic state by setting the HlO output to L, and the analog switch ASW is set to the closed state, and the drive control circuit D operates the air cylinders 22 and 44 to detect the detection means 25 and the guide means 29 of the upper cloth control device 1. and move them forward to the operating position. When the end of the cloth is inserted between the detection means 25 and the guide means 29 and the pedal is pressed forward, the first comparator CPl generates an H level output, and the presser foot descends in the same manner as described above. The gate G2 is held at the L level by the O output of the flip-flop FF, and by further depressing the pedal, the second comparator CP2 is turned on.
An H level output is generated from the gate G4, and the comparator CP
2 and the H of the Q output of the flip-flop FF are input to generate an action signal, and the sewing machine motor is driven at a constant speed under the control of the constant speed control circuit AS. The stitches are formed while being controlled by the roller of the lower fabric control device 2 in a direction crossing the fabric feeding direction so that the needle drops from the edge of the fabric at regular intervals. When the trailing edge of the fabric passes through the fabric detection means 25, the sewing machine is automatically stopped at the needle down position. When the thread trimming switch field W is operated after stopping, since the gate G1 is opened by the output of the flip-flop FFO), an upper stop command signal and a thread trimming command signal are generated, and the thread trimming means is activated.

When the pedal is pressed backward again from this state, the switching switch BSW is once closed and the flip-flop FF sets the Q output to L and the η output to H to enter the manual state, allowing the same control as described above.

For example, when forming side seams to sew the left and right armpits of pants using this sewing machine, if thick stepped sections such as pockets are formed at different distances from the starting edge of the fabric depending on the left and right armpits, The sewing machine is set to manual mode from the start of sewing until the multi-layered section passes through cloth detection means 25, and when the multi-layered section passes through cloth detection means 25, the pedal is released to temporarily stop the sewing machine, and the sewing machine is set to automatic mode by depressing the pedal backward. After switching to , the sewing machine is started again, and the sewing up to the remaining sewing end of the cloth is automatically sewn under the control of the upper and lower cloth control devices 1 and 2.

As a result, even if the distance from the starting edge to the stepped portion of the cloth is different between the left and right side portions, a reliable seam can be formed. In addition, in this embodiment, the front and back pedal depression operations are detected by analog output, but the pedal operation amount is detected digitally, and the speed control circuit SC is detected by digital output.
, the constant speed control circuit AS1, the starting circuit MC, etc., or other operating means such as a lever may be used in place of the pedal.

As described above, according to the present invention, the operating means B-SW enables the first operation that generates different data signals corresponding to the operation position and the second operation that generates a switching signal in relation to the operation; It has a manual circuit that drives and stops the sewing machine at different speeds in response to the data signal, and an automatic circuit that drives and stops the sewing machine at a constant speed in response to the data signal, and one circuit is connected to the sewing machine alternately in response to the switching signal. a control circuit connected to the cloth detecting means and the cloth guiding means, in response to a switching signal, an automatic circuit of the control circuit moves and locks both said means in an operating position when connected to the sewing machine, and a manual circuit connects the means; By providing actuating means 22 and 44 for moving and locking both of the above-mentioned means to the inactive position when the operation is performed, switching by the second operation of the operating means allows the cloth to be moved to the cloth detecting means, the cloth guiding means, and the cloth moving means. The sewing machine can be immediately set to an automatic state in which the sewing machine is controlled at a constant speed and driven at a constant speed, and a manual state in which each means is separated from the fabric and the sewing machine is driven at a variable speed by the first operation of the operating means. In cases such as side sewing with a stepped portion at the edge, manual sewing is used from the starting edge of the fabric to the stepped portion, and automatic sewing is performed after the stepped portion passes through the fabric detection means. Side stitching can be performed accurately and quickly without getting caught in the detection means or guide means, which has the effect of significantly improving work efficiency. Even when the distance between the multi-layered part and the starting edge of the material is different depending on the left and right sides, automatic sewing can be performed on the left and right sides. Effects such as being able to do this can be obtained.

[Brief explanation of the drawing]

Figure 1 is a plan view of the sutured part, Figure 2 is a side view of the sutured part, and Figure 3 is a side view of the sutured part.
The figure is a perspective view with a part of the upper part of the frame of the upper cloth control device cut away and a part of the cover removed, and FIG. 4 is an electric circuit. In the figure, 25... Cloth detection means, 29... Cloth guiding means, 34... Cloth guiding means, BSW... Changeover switch as operating means, FF... T-type flip-flop in control circuit. , ASW...analog switch in the control circuit, SC...speed control circuit in the manual circuit, AS...
Constant speed control circuit in automatic circuit, 2 sous, 44...Air cylinder as operating means.

Claims (1)

[Claims] 1. On one side of the fabric feed line that passes through the needle in front of the fabric feed direction with respect to the sewing machine sewing part, there is an operating position that is close to one edge of the fabric to detect the presence or absence of fabric and generate a fabric detection signal. The cloth detection means 25 is movable in the horizontal direction crossing the cloth feeding direction or in the vertical direction to an inactive position away from one side edge.
and a working position which is arranged in the cloth feeding direction relative to the cloth detection means and has a fixed horizontal interval and which maintains one edge of the cloth horizontally and guides it to the cloth detection means, and a non-operating position which is located away from the one edge of the cloth. A cloth guiding means 29 is provided at the working position and is movable in the horizontal direction or in the vertical direction crossing the cloth feeding direction, and a cloth detecting means is provided at the working position so as to keep the distance from one edge of the cloth to the needle constant. a cloth moving means 34 capable of moving the cloth in a direction crossing the cloth feeding direction by contacting the cloth in response to a cloth detection signal from the first operation; and a first operation that generates different data signals corresponding to the operation position. and a second operation that generates a switching signal in relation to the operation, a manual circuit that drives and stops the sewing machine at different speeds in response to the data signal, and a second operation that is constant in relation to the data signal. a control circuit which has an automatic circuit that drives and stops at different speeds and alternately connects both circuits to the sewing machine each time a switching signal is generated; and a control circuit which is connected to the fabric detection means and the fabric guide means and is connected to the switching signal in relation to the switching signal. actuating means 22, 44 for moving and locking both said means in an operative position when a manual circuit is connected to the sewing machine, and moving and locking said two means for moving and locking said two means in an inactive position when a manual circuit is connected; sewing equipment.