JPS599187B2 - Pattern selection device for sewing machine - Google Patents

Description

[Detailed description of the invention] The present invention relates to a button selection device for a sewing machine.

Decorative stitch sewing machines, such as those described in U.S. Pat. And a predetermined point in time occurs at which it is delivered to the electromagnetic actuator.

If a different batten is selected following this given point in the cycle, the first stitch made after that selection will be in position according to the data already drawn from the batten used before the selection. Become.

Therefore, an inappropriate seam is formed at the beginning of the seam pattern, detracting from the aesthetic appearance of the seam.

An object of the present invention is to prevent stitches drawn from a previously selected stitch from being carried over when a new pattern is selected in a sewing machine equipped with an electromagnetic actuator for controlling stitch patterns. .

This object is achieved by providing an interlacing mechanism that pulls the needle away from the needle actuating mechanism and activating said interlacing mechanism during one stitch forming cycle when the button selection device is activated. .

There are various types of electromagnetic actuators capable of commanding the stitch pattern of a sewing machine, and each of these actuators has a different predetermined point in time at which it should supply batten data prior to stitch formation.

For example, U.S. Patent No. 3. In the electromagnetic actuator described in , 8 1 2, 7 2 9, the data retrieved from the storage device is stored virtually throughout the seam forming cycle before the seam to be controlled is placed. need to be sent.

Therefore, with this type of actuator, no matter at what point in the stitch forming cycle the stitch selection occurs, an interlaced stitch mechanism is used when the button selection device is actuated.

However, in the electromagnetic actuator described in U.S. Pat. I need to send it in the evening.

Therefore, when using this actuator, there is no need to operate the interlaced stitch mechanism if the button selection is made when the needle is rising, and in fact, using the interlaced stitch mechanism in such conditions is a new choice. This only delays the formation of the seam pattern.

It is an object of the present invention that during each stitch forming cycle, the interlaced stitch mechanism is activated in accordance with the selection of the stitch only when the electromagnetic actuator is actuated in response to data sent from the previous stitch selection button. It is to provide a device that is adapted to operate.

The purpose is to provide a stitch forming mechanism that can continuously form stitches in various stitch patterns, a sewing machine drive mechanism that causes the stitch forming mechanism to perform repeated stitch forming cycles, and a sewing machine drive mechanism that allows the stitch forming mechanism to perform repeated stitch forming cycles. an electromagnetic actuator operatively coupled to control the stitch pattern formed by the mechanism and storing data for adjusting said electromagnetic actuator to control the placement of each stitch in accordance with the stitch pattern; death,
and a storage device having a capacity to store independent data regarding each of the plurality of various stitch patterns, and the storage device written by an operator and associated with a selected one of the plurality of various stitch patterns. a button selection device for validating data stored in the sewing machine; an interlaced stitch mechanism for separating the sewing machine drive mechanism from the stitch forming mechanism; and a pulse generator for supplying a synchronizing pulse for each stitch forming cycle. a device for retrieving data regarding the placement of a next stitch in the selected stitch button from the storage device in response to synchronization pulses from the pulse generator; and a device responsive to operation of the button selection device. and a device for operating the interlaced stitch mechanism until the next synchronizing pulse is supplied from the pulse generator, and an operation of the interlaced stitch mechanism is performed in response to the operation of the button selection device. and a device for preventing the data retrieval device from retrieving data from the storage device while the data retrieval device is in use.

Preferably, the sewing machine selects the next stitch in the selected stitch batten from the memory device by a synchronization pulse supplied at a predetermined timing just before the needle penetrates the workpiece from the pulse generator. and a device for energizing the electromagnetic actuator in accordance with this data, the point of operation of the button selection device being at a predetermined seam forming cycle after the supply of synchronizing pulses from the pulse generator. A device is provided for enabling the device to operate the interlacing mechanism when the interlacing mechanism is in between.

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

As shown in FIG. 1, a sewing machine casing 10 represented by phantom lines has a bed 11, a machine column 12 rising from the bed, and an extending arm 13 suspended above the bed.

The drive mechanism of the sewing machine has an upper shaft 14 and a lower shaft 15 connected by a timing belt 16 within the machine column.

The needle 17 is carried so as to perform longitudinal reciprocating movement by a needle bar 18 , which needle bar supports 19 in the overhanging arm 13 .
It is mounted in such a way that it can swing laterally.

The connection between the upper shaft and the needle bar for imparting reciprocating motion to the needle has a separable connection section, generally designated by 100, as described below, and this connection section is technically referred to as an interlaced stitch mechanism. It is something.

In order to impart a lateral swing to the needle, the drive link 25 is pivotally connected at 26 to a block 27 which is arranged in a radial guide groove 28 of the swing drive member 29.

Said drive member forms part of an electromagnetic actuator, generally designated 30, and is adapted to control the lateral force oscillation or zigzag width.

One such actuator that can be used with the present invention is described in US Pat. No. 3,881,433.

To understand the invention, it is sufficient to understand that the actuator 30 has a drive shaft 31 carrying a sprocket 32 that engages the timing belt 16.

The interlocking link 33 connected to the drive member 29 is connected to the drive shaft 31
The selected position of the drive member 29 within the range of movement given by the drive shaft is determined by five solenoids 20, 21,
It is maintained by selective energization of 22, 23, and 24.

In addition, in FIG. 1, the feed dog 3 supported by the feed base 35 is shown.
A portion of the workpiece feeding mechanism including 4 is shown.

FIG. 1 shows the workpiece feeding mechanism that gives the feed dog a workpiece conveyance motion, including a feed drive shaft 36 driven by a gear 37 from the lower shaft 15, and a cam 3 on the feed drive shaft.
8. A pitman 39 is connected to hold the cam 38 and reciprocate the sliding block 40 within the feed adjustment slot 41.

A link 42 pivotally connects the pitman 39 to the feed carriage 35 such that the inclination of the slot 41 determines the magnitude and direction of the feed stroke of the feed dog.

In the present invention, the slope of said slot 41 can be controlled by an electromagnetic actuator, generally represented by 43.

This electromagnetic actuator 43 is further described in the above-mentioned U.S. Pat.
Sprocket 45 which can be formed according to No. 8 8 1, 4 3 3 and engages with timing belt 16
It is possible to have a drive shaft 44 carrying a.

An interlocking link (not shown), which is moved alternately back and forth by a drive shaft 44, is connected at 47 to a link 46 which is pivotally connected to a swinging arm 48, said swinging arm being a swinging link mounted in slot 41. It is carried by a shaft 49.

The selected position of the interlocking link and thus the link 46 is such that the five solenoids 7
It can be maintained by selecting 4, 75, 76, 77.78.

A dial 88 on the sewing machine bed includes a crank pin 89 held by an adjustment link 94, said link 94
extends into the electromagnetic actuator 43 to provide balanced control.

This balance control provides fine mechanical adjustments between the interlock link connections and slots 41 to obtain the exact stitch length and direction desired.

In the preferred embodiment, the extending arm has four selection switches 5.
0, 51, 52, 53, these switches are actuated by the operator to select one of the decorative stitch patterns stored in the electronic storage device 91, 92, 93 or a straight stitch. ing.

A straight stitch pattern is obtained by actuating the selection switch 50, while three different decorative stitch patterns are associated with each selection switch 51, 52, 53.

The actuation of switches 50-53 and the apparatus for actuating said switches to form a selected stitch pattern are the subject matter of U.S. Pat. No. 3,872,808, which is associated with this invention. be.

As described in this patent, pressing any one of switches 50-53 to select a pattern generates a pulse signal in its conductors which resets the address count and creates a new pattern each time a selection is made. The selected button will start at a predetermined time.

In the present invention, a pulse signal in conductor 139 (FIG. 4) is used to indicate when any button selection has been made.

In FIGS. 1 and 3, an interlacing mechanism 100 has a construction as described in U.S. Pat. No. 3,820,485.

The manner in which this interlaced stitch mechanism cooperates with the present invention will now be described.

A block 102 is attached to the needle bar 18 with a screw 101.

A second block 103, which is freely slidable on needle bar 18, has a shaft 104 that is operatively connected to a conventional needle reciprocating crank mechanism (not shown) of a sewing machine.

When blocks 102, 103 are locked together, the needle reciprocates in the normal manner, and blocks 102, 103
3 are mutually released, the reciprocating movement of the hands is interrupted.

The clutch lever 105, which is pivotally connected to the block 102 at 106, is provided with a clutch finger 107 which, when located below the block 103, connects the two blocks 10
2, 103 are locked.

The tongue piece 108 on the clutch lever 105 is the bell crank 1
The bellcrank is capable of engaging one arm 109 of 10 with a fulcrum pin 111 carried within the block 102.
It is pivoted by.

The bell crank 110 is a release member 1 that is vertically movable.
13, said release member having an angled slot 114 which embraces a guide pin 115 in the sewing machine frame, said release member being moved laterally when raised and thus raised. At times, the reciprocating movement of the needle bar is interrupted.

A spring 116 located between the fulcrum pin 111 on the block 102 and the arm 117 on the release member is adapted to raise the needle bar when the crunch lever 105 rotates to interrupt the reciprocating movement of the needle. .

A lateral hanging piece 120 on the release member 113 is located above one arm 121 of a lever 122, which has a fulcrum pin 123 carried in the sewing machine frame and which has a fulcrum pin 123 carried within the sewing machine frame and the other arm 124.
is operatively connected to solenoid 125.

If the solenoid 125 is momentarily energized, the reciprocating movement of the needle is interrupted, thus causing stitch skipping.

The pulse signal produced in conductor 139 upon closing one of the button selection switches 50-53 as described in the aforementioned U.S. Pat. No. 3,872,808 is amplified in the conventional manner and It can be used to directly actuate solenoid 125 whenever a button selection is made.

Such an arrangement is ideal when using an actuator in which the button information is delivered well in advance of each stitch being formed.

When using an actuator that is supplied with flap stitch information immediately before needle penetration begins, it is possible to select a pattern without having to skip the first stitch. A period exists between each seam forming cycle prior to providing the baton information.

In order to avoid unnecessary skipping of the first stitch, a device for determining the point in time when the baton information is supplied is required, and this is disclosed in U.S. Pat. No. 3,815,531, as described below.
A pulse generator unit 143 as described in
This is done by using .

As shown in FIG. 2, the unit 143 consists of two independent pulse generators, each pulse generator having a semicircular cam 150, 152.

Preferably, the cams are formed of the same magnetic flux conductive material as the upper shaft to which they are secured by screws 148.

Each cam 150, 152 has a variable circumference consisting of a large diameter segment 154 and a small diameter segment 156, with each cam adapted to cooperate with one of a pair of Hall effect devices 158, 160.

Each Hall effect device 158, 160 comprises a magnetic flux responsive unit, which unit has an output conductor 170, 172, respectively.
Or, by 1 7 0' and 1 7 2', when the magnetic flux density is small, a low voltage (0.3 volts) or zero voltage is generated, and when the magnetic flux density is small, a relatively high DC voltage (+4 volts) is generated. occurs.

The conductors 170, 170' are grounded and thus actually form the output of the high voltage pulse generator unit 143 produced in the lines 172, 172'.

Permanent magnets 174 are placed in close proximity to the Hall effect devices 158, 160 and are provided with a flux conducting base member 176.

The flux conducting member has an extension 184 located above a disk 186, also formed of a flux conducting material, and mounted on the upper shaft 14.

When the large diameter segment 154 of each cam iso, 152 is positioned relative to the corresponding Hall effect device 158 or 160, the output line 172 or 172, respectively
’ High voltage is generated.

When the upper shaft rotates in the direction of the arrow in FIG. large diameter segment 15 of
4 is the Hall effect device 16 at the top dead center of the reciprocating movement of the needle.
It is synchronized so that it is positioned opposite to 0.

Cam 150 cooperates with Hall effect device 158 to
A pulse is generated within the machine, and the button information for feed adjustment is supplied at the point where the needle has made a 1/4 rotation past the tenth dead center, that is, the point where the needle begins to enter the workpiece and the previous feed stroke has ended. It is synchronized to start.

When the shaft 14 rotates counterclockwise when looking at FIG. 2 from the left,
The large diameter segment 154 of the cam 152 is moved relative to the Hall effect device 160 as previously described, its position being synchronized at the tenth dead center of the needle reciprocation, and transmitting a high voltage signal to line 172'. Occur.

As cam 152 rotates approximately 180 degrees more, the high voltage signal on line 172' is disconnected.

A large diameter segment 154 of cam 150 moves relative to Hall effect device 158 about 90 degrees behind that of cam 152, ie, about 90 degrees beyond top dead center, and produces a high voltage signal on line 172.

As cam 150 rotates an additional 180 degrees, the high voltage on line 172 is disconnected.

Therefore, at 270 degrees beyond top dead center of the needle reciprocation, lines 172 and 172' are both off.

In the above-described type of the present invention, if the selection of the slam cam is performed between 1/4 rotation from 270 degrees to the top dead center of each stitch type cycle, skip stitches will not occur; is performed at any other point, interlaced stitching is performed.

A circuit which operates the interlaced stitch mechanism only when a button selection is made at a predetermined portion of each stitch forming cycle will be described with reference to the Bellock diagram of FIG.

In the diagram of FIG. 4, 201, 202, 203 indicate one-shot units having input terminals A, B and output terminal Q.

A high voltage or on voltage pulse appears at output terminal Q only when input terminal A is at a low voltage or off voltage state and input terminal B is at a high voltage or on voltage state.

In the following description, an off state in any conductor means a low voltage (0.3 volts DC) or zero voltage, and an on state means a high voltage (+4 volts DC).

FIG. 4 shows AND gates 301 and 302, OR gates 401 and 402, and NOR gate 500, each of which has an input terminal A, B and an output terminal Q.

AND gates 301 and 302 generate a signal at output terminal Q only when both input terminals A and B accept an ON signal.

OR gates 401 and 402 generate a signal at output terminal Q only when one or both of input terminals A and H accepts an ON signal.

NOR gate soo generates a signal at output terminal Q only when both input terminals A and B accept an OFF signal.

The diagram in FIG. 4 shows three flip-poof opening units 601, 602, and 603, and each of these flip-poof opening units has a pair of input terminals A, B and symbols 0, 1. It has an output terminal.

The symbol 0 represents that the Fritspoof lamp is in the off state when its input terminal A receives an on pulse, and the symbol 1 represents that it is in the on state.

When input terminal B of any flippoof spout unit receives an on-pulse, the state of each pair of output terminals is opposite to that shown in FIG. 4, and vice versa until input terminal A receives an on-pulse again. It stays in this state.

The flip-poof spout unit 601 is shown in FIG. 4 by a pulse in line 901 extending from one-shot unit 201 when it receives a zigzag width signal in line 172' starting at the top dead center of the reciprocating movement of the sewing machine needle. state.

Line 902 thus places AND gate 301 in a ready state to generate an output signal when the AND gate receives a button select pulse on lines 139, 903, and 904.

The flip-poof spout unit 602 is now switched to the state shown in FIG. 4, and the line 905 for activating the interlacing mechanism now accepts the ON signal.

Note that as a result of flip-flop unit 601 being switched to the state shown in FIG.
Upon receiving a sending signal in line 172 extending from 43,
It is prepared to respond to this signal.

The pulse from the one-shot unit 202 to the flip-flop unit 603 through line 907 is transmitted through line 908.
is in the OFF state, and therefore the pulse generator 1 is turned off at a point rotated 270 degrees past the top dead center of the sewing machine needle reciprocating motion.
When the zigzag width from 43 and the signals from both the feed lines 172' and 172 disappear, the one-shot unit 20
3 is prepared to respond to the signal from the NOR gate 500.

A count pulse is then generated in line 909 to retrieve the stitch slam data for the next stitch.

The operation of the Noah gate is not to send a pulse to the one-shot unit 203, but to change the flip-poof spout unit 602 to the opposite state to that shown in FIG. 4 through a line 910, thereby ending the operation of the interlaced stitch operating mechanism let

In this way, the reciprocating movement of the needle is controlled by the button selection line 13.
Only one stitch is interrupted when started by a pulse within 9.

The count pulse in line 909 causes the OR gates 401, 402 to send a signal through line 911 to the flip-flop units 601, 603 to change the state opposite to that shown in FIG.

During the period from 270 degrees before top dead center to the top dead center, the AND gate 301 is deenergized and the line 139
A slam pulse received within will not activate the interlace stitch mechanism.

The other portions of the logic circuit shown in FIG.
Count pulses within 09 are prohibited.

When the count pulse is inhibited in this way, the stitch slam data corresponding to the first stitch of the newly selected pattern is changed to the sewing machine needle reciprocating mechanism is activated again and the stitch batt data corresponding to the first stitch of the newly selected pattern is changed. is retained as a stored output until it is prepared to be formed.

The button selection pulse in line 139 is sent to the OR gate 402 and the line 9 to flippoof spout unit 603.
By generating a signal in 12, the flippoof spout unit 603 immediately changes to the state opposite to that shown in FIG.

This causes one-shot unit 203 to not send count pulses to its output terminal Q.

Furthermore, the ON signal in line 905 which activates the interlace stitch mechanism is sent through line 913 to input terminal A of AND gate 302.

This on signal is transmitted from output terminal Q of AND gate 302 to line 91 along with an on signal in line 903 generated from a button selector applied to input terminal B of AND gate 302.
4 to send an on signal to the OR gate 401,
An on signal is provided to terminal B of flip-flop 601 through line 915.

The ON signal developed in line 906 is the one-shot unit 2.
A line 90 where 02 connects to the Fritspoof spout unit 603
7.

Therefore, one shot unit 203 will not generate a count pulse until the next stitch forming cycle occurs and the interlace mechanism is not activated by the ON signal in line 905.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a sewing machine using the apparatus of the present invention. FIG. 2 is an enlarged perspective view of the pulse generator used in the present invention. FIG. 3 is an enlarged perspective view of a portion of the needle bar mechanism of the sewing machine shown in FIG. 1, and also shows an interlaced stitch mechanism. FIG. 4 is a block diagram showing a portion of the electronic circuit used in the present invention. In the figure, 10 is a sewing machine casing, 11 is a bed, 1
2 is the machine pillar, 13 is the extending arm, 14 is the upper shaft, 15 is the lower shaft, 1
6 is a timing belt, 17 is a needle, 18 is a needle bar, 19 is a needle bar support, 20-24 is a solenoid, 25 is a drive link, 27
is a block, 28 is a guide groove, 29 is a swinging drive member, 30
3 is an actuator, 31 is a drive shaft, 32 is a sprocket, 33 is an interlocking link, 34 is a feed dog, 35 is a feed base, 3
7 is a gear, 38 is a cam, 39 is a pitman, 40 is a sliding block, 41 is a slot, 42 is a link, 43 is an actuator, 44 is a drive shaft, 45 is a sprocket, 46 is a link, 48 is a swinging arm, 49 is a swing axis, 50-53 is a switch, 74-78 is a solenoid, 88 is a dial, 89
1 is a crank pin, 91-93 is a storage device, 94 is an adjustment link, 100 is a connecting portion, a skip stitch mechanism, 101 is a screw, 102 is a block, 103 is a second block, 104
is the shaft, 105 is the clutch lever, 107 is the finger piece, 108
109 is a tongue piece, 109 is an arm, 110 is a bell crank, 111 is a fulcrum pin, 112 is a second arm, 113 is a release member, 114
115 is a slot, 115 is a guide pin, 116 is a spring, 117 is an arm, 120 is a side hanging piece, 121 is an arm, 122 is a lever, 12
3 is a fulcrum pin, 124 is an arm, 125 is a solenoid, 13
9 is a conductor, 143 is a pulse generator unit, 148 is a screw, 151, 152 are cams, 154 is a large diameter segment, 156 is a small diameter segment, 158, 160 are Hall effect devices, 170, 172, 170', 172' is an output conductor, 174 is a permanent magnet, 176 is a magnetic flux conduction basic member,
184 is an extension part, 186 is a disk, 201, 202,
203 is a one-shot unit, 301 and 302 are AND gates, 401 and 402 are OR gates, 500 is a NOAH gate, and 601, 602, and 603 are flip-to-flip units.

Claims (1)

[Scope of Claims] 1. A stitch forming mechanism that can continuously form stitches in various stitch patterns, a sewing machine drive mechanism that causes the stitch forming mechanism to perform repeated stitch forming cycles, and an electromagnetic actuator operatively coupled to the forming mechanism to control the stitch pattern formed by the mechanism; and adjusting the electromagnetic actuator to control the placement of each stitch in accordance with the stitch pattern. a storage device having a capacity to store data and to store independent data regarding each of a plurality of different stitch patterns;
a button selection device for activating data stored in the storage device relating to a selected one of the plurality of different stitch patterns; and a jump for separating the sewing machine drive mechanism from the stitch forming mechanism. a basting mechanism; a pulse generator for supplying a synchronizing pulse for each stitch forming cycle; a device for extracting data relating to eye placement; and a device for activating the interlaced stitch mechanism for a period of time until a next synchronization pulse is supplied from the pulse generator in response to operation of the button selection device; The invention is characterized by comprising a device that prevents the data extraction device from extracting data from the storage device while the interlaced stitching mechanism is operating in response to the operation of the button selection device. sewing machine. 2. The sewing machine according to claim 1, wherein the selected i-th button is stored in the storage device by a synchronization pulse supplied from the pulse generator at a predetermined timing immediately before the needle penetrates the workpiece. a device for retrieving data regarding the placement of the next stitch in the stitch and energizing the electromagnetic actuator in accordance with this data, the moment of operation of the button selection device being after the supply of synchronizing pulses from the pulse generator; A sewing machine comprising a device for activating the interlacing mechanism during a predetermined stitch forming cycle of the sewing machine.