JPS6160715B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a feed setting device for a sewing machine, and more particularly to a conventional four-motion feed dog that moves in synchronization with the up and down reciprocating movement of a needle, and a device for controlling the feed movement of the feed dog. A sewing machine comprising a feed adjuster and an actuating means that operates when the feed dog sinks in conjunction with the up and down reciprocation of the needle to set the feed adjuster in accordance with feed information corresponding to each stitch pattern. This invention relates to a feed setting device.

Feed information for forming various stitch patterns is stored in the sewing machine so as to be extracted as a mechanical displacement amount, and this information is mechanically extracted in synchronization with the rotation of the main shaft of the sewing machine and sent to the feed regulator. Devices are known in which transmission and setting operations of the feed regulator are carried out. Further, the feed information is stored in the sewing machine so that it can be taken out as an electrical code signal, and after the information is taken out electrically in synchronization with the rotation of the main shaft of the sewing machine, it is converted into mechanical displacement via an exchange device. Devices are also known in the prior art in which the mechanical displacement is transmitted to a feed regulator to effect a setting operation of the feed regulator. In such devices, due to the large mechanical and electrical inertia, the setting operation of the feed regulator is not performed quickly when the sewing machine is running at high speed, and the feed regulator is not adjusted within a predetermined period of time. It has the disadvantage that it is difficult to position it stably.

In view of such circumstances, a technique has already been proposed to electrically quickly eliminate the above-mentioned inertia. The technique is to control a reversible motor operating as the conversion device in a closed loop, as disclosed in, for example, Japanese Patent Application Laid-Open No. 101161/1983.
Such closed loop control requires a position detector that detects the position of the reversible motor and generates a position signal, a signal generator that compares the position signal with a command signal, and generates an error signal, and the like. Moreover, such closed-loop control is not applicable to sewing machines of the type where feed information can be extracted as a mechanical displacement amount.

SUMMARY OF THE INVENTION The object of the present invention is to provide a device which can overcome the above-mentioned drawbacks and which can be applied to any type of sewing machine. In order to achieve the object, the sewing machine according to the present invention sets the feed adjuster according to the feed information prior to actuating the actuating means that operates in conjunction with the up and down reciprocating movement of the needle. Means are provided for temporarily acting on the regulator to force the feed regulator to move within a predefined operating range within the maximum adjustable operating range. Due to the actuation of the means, when the feeding operation of the feed dog with respect to the work cloth is completed and the feed dog is sinking, the feed adjuster must be activated in advance before the said actuating means is actuated to control the next feed movement. Located within a limited operating range, the displacement for subsequent setting operations of the feed adjuster is minimized. Therefore, the setting operation of the feed adjuster can be performed quickly, and the feed adjuster can be stably positioned within a predetermined period.

In a preferred embodiment according to the present invention, the forced moving means includes a driven member fixed to a shaft for setting and operating the feed adjuster, and a driven member located opposite to the driven member so as to be able to engage with the driven member to move the needle up and down. and a drive body that is reciprocated in synchronization with the movement of the feed adjuster to mechanically move the feed adjuster into a predefined operating range. It is therefore another object of the present invention to provide a feed setting device that mechanically provides rapid and accurate positioning of the feed adjuster.

Furthermore, in one embodiment of the present invention described below,
A synchronizing means for reciprocating the drive body in synchronization with the up and down reciprocation of the needle includes an actuation cam,
The rotation of the actuating cam causes the driving part body to move forward, and the feed adjuster is once moved within a predetermined operating range via the driven part body, and the feed adjuster is moved by the subsequent actuation of the actuating means. When operated, the driven part body engages with the driving part body which is moving backwards due to the rotation of the operating cam, and the feed adjuster is set and operated accordingly as the driving part body subsequently moves backwards. Ru. Accordingly, a further object of the present invention is to provide a feed setting device in which the feed adjuster is stably positioned without passing the setting position corresponding to the feed information.

An embodiment embodying the present invention will be described in detail below with reference to the drawings.

Referring to FIG. 1, the sewing machine 20 includes a column 21, a bed 22 extending from the column, and a bracket arm 23 that is supported by the column and extends above the bed and has a head formed at its end. It has a frame. The bracket arm 23 opens upward, and the opening is covered by a top cover 24. A display board 25 is fixed to the bracket arm and visually displays all of the stitch patterns that can be formed, as well as one of the particular stitch patterns that has been selected. a pair of push buttons 26,
27 and a further pushbutton 28 on the display board 2
It protrudes through the opening 5 and can be manually operated by the operator. A series of indicator lamps 29 are arranged above each indication of the stitch pattern, and when the lamp corresponding to a selected stitch pattern is selectively turned on, the selected stitch pattern is displayed. The eye pattern is indicated. Further, a push button 30 for instructing to start and stop the sewing machine and a push button 31 for instructing to perform tacking are mounted adjacent to the front surface of the head of the bracket arm 23, and A manual knob 32 for setting the operating speed is attached. Further, on the right side of the pillar 21, there are three adjustment dials 33, 34 and 3.
5 protrudes so as to be manually operable, and each performs the function described below. 36 is the bracket arm 2
A needle bar 38 is mounted in the head of the sewing machine so as to be able to reciprocate up and down and slide in the lateral direction, and supports the needle 37 at its lower end. This is a feed dog that performs a four-feed motion.

Next, referring to FIGS. 2 to 8, a step motor 39 is fixed within the bracket arm 23, and its output shaft 40 carries a large amount of needle position information for controlling the lateral position of the needle. A first disk 41 having a series of recorded concave and convex portions on its periphery.
A second disk 42 is fixed, which has a series of concave and convex portions on its periphery, each of which is loosely fitted and has a series of concave and convex portions each recording a large number of feed information for controlling the feed movement of the feed dog. A substantially annular intermediate member 44 having a protruding shoulder portion 43 is loosely fitted around the boss portion of the second disc 42 between the two discs, and a through hole 45 formed in each of the discs 41 and 42, 46, the protruding shoulder 43
are mated. The respective widths of both through holes are the protruding shoulders 4
3, and the intermediate body 44 is rotatable relative to both disks 41, 42 by at least about 5 degrees. The first coil spring 47 is locked at one end to the second disk 42 and at the other end to the intermediate body 44.
The intermediate body 44 is connected to the second disk 42.
The force is applied in the counterclockwise direction in FIG. The second coil spring 48 connects the first disc 41 at one end.
The first disk 41 is engaged with the intermediate body at its other end, and the first disc 41 is urged clockwise in FIG. 8 with respect to the intermediate body 44. Therefore, the first disc 41 is always held at a predetermined relative angular position with respect to the second disc 42, and at that angular position both through holes 45, 46 are aligned. Now, if the first disc 41 is fixed, the second disc 42 can be independently rotated by at least about 5 degrees both clockwise and counterclockwise. Further, the step motor 39 is constructed so that it can take 148 resting positions during one rotation of its output shaft 40, and correspondingly, the circumferential edge of each disc 41, 42 is divided into 148 equal parts. A flat surface having the same radius within the unit angle range is formed, and the uneven portion is formed from such a flat surface. Different needle position information or feed information is recorded in relation to the size of the radius of the flat surface, and both disks 41 and 42 have information in which 148 needle position information and 148 feed information are recorded, respectively. It constitutes a record body.

Furthermore, as can be fully understood by referring to FIG.
are recorded as a group within each corresponding section of the stitch pattern according to a predetermined sequence for each stitch pattern. In this way, the uneven portions related to the needle position and feed information for determining the arrangement of each of a plurality of stitches constituting one stitch pattern are not necessarily adjacent to each other in the order in which the stitches are arranged. The fact that it has not been formed is an important matter in understanding its future effects. Then, the uneven portions of both discs 41 and 42 located at the angular positions indicated in the top row of the columns related to each stitch pattern in FIG. This corresponds to the first part where needle position and feed information are recorded.

A bracket 49 fixed in the bracket arm 23 supports a shaft 50 on which a first swinging arm, on which a contact 51 facing the first disc 41 is adjustable, is fixed. 52, a second swinging arm 53 and an intermediate arm 54 whose relative positions are adjustable and fixed; first and second swinging members 5;
5 and 56 are each swingably supported.
The first swinging arm 52 includes a first operating lever 58 having a pin 57 that fits into the two prongs formed on the swinging body 55, and a first operating lever 58 having a pin 57 that fits into the two prongs formed on the swinging body 55. a buffer piece 59 that faces the pin 57 with one leg sandwiched therebetween and is formed with a cam surface that faces the leg;
are pivotally connected to each other, and the buffer piece is connected to the swinging body 55.
The cam surface of the buffer piece 59 comes into contact with the swinging body 55 due to the action of the coil spring 60 stretched between the shock absorbing piece 59 and the swing member 55 . Similarly, a second operating lever 62 having a pin 61 that fits into the forked portion formed on the swinging body 56 is pivotally attached to the second swinging arm 53 , and a second actuation lever 62 is pivotally attached to the second swinging arm 53 . A buffer piece 63 is pivotally mounted to sandwich one leg of the two-pronged part of the swinging body 56, facing the pin 61, and having a cam surface facing the leg. Due to the action of the coil spring 64 stretched between the swinging member 56 and the
The cam surface contacts the swinging member 56. Further, the movement of both the swinging parts 55 and 56 along the axis 50 is as follows:
Projecting pieces 65 and 66 formed on the bracket 49
This is prevented by fitting into grooves (see FIGS. 2 and 5) formed in both swinging members. A link 69 having a roller 68 that fits into a groove 67 formed in the swinging body 55 is connected to the needle 3.
A link 72 is operatively connected to the needle bar 36 for lateral oscillation of 7 and also has a pin 71 that fits in a groove 70 formed in the second oscillating body 56. It is operatively connected to a feed adjuster 164, described below, for controlling the feed movement of the feed dog 38. The position of the roller 68 in the groove 67 of the swinging body 55 and the position of the pin 71 in the groove 70 of the swinging body 56 can be adjusted arbitrarily by manual operation of the adjustment dials 33 and 34 shown in FIG. It is adjustable. The brake member 73 is fixed to the bracket 49, and includes a protrusion 74 that elastically engages with the swing body 55 to prevent its movement;
It is formed with a pair of bent pieces 75, 75 that limit the swinging range of the swinging member body 55.

The housing of the step motor 39 has a shaft 7.
6 is fixed, and a contact 77 facing the second disc 42 is fitted onto the shaft thereof so as to be movable in the axial direction. A pin 78 fixed to the second swinging arm 53 is fitted into the two prongs formed on the contact,
The contact 77 is urged to be separated from the second disc 42 by the action of a coil spring 79 stretched between the pin and the bracket 49. Similarly, the contact 51 is separated from the first disk 41 by the action of the coil spring 81 stretched between the first swing arm 52 and the spring hook 80 fixed to the bracket 49. energized. As will be described later, both the contacts 51 and 77 engage with the uneven portions of the first and second disks 41 and 42, respectively, and move in the lateral direction of the needle 37 according to the height of the uneven portions. The position and setting position of the feed adjuster are determined, and both contacts have information retrieval means for selectively retrieving the needle position information and feed information recorded on the first and second discs 41 and 42, respectively. It consists of Further, by the axial movement of the contactor 77, two flat surfaces 82, 8 facing the contactor are formed.
A cam member 84 having a stepped shape is attached to the housing of the step motor 39 and is located behind the second disc 42 . As is clear from FIG. 15, the flat surfaces 82 and 83 are as follows.
Each of the output shafts 40 of the step motor 39 has a predetermined radius from the axis, and as described later, one flat surface 82 sets a predetermined minute backward feed amount for tacking stitches. The other flat surface 83
is for setting a constant large backward feed amount for reverse stitching. The moving lever 85 is pivotally connected to the housing of the step motor 39, and a pin 86 fixed to one end of the moving lever 85 is fitted into the elongated hole of the contact 77. Rotation of the moving lever 85 causes the contact 77 to move. sliding along axis 76;

A guide body 89 having a pair of longitudinal slots 87, 88 is fixed within the bracket arm 23, into which the first and second actuating levers 5 are inserted.
The extensions 8 and 62 fit together to guide the movement of both operating levers. A pair of linking arms 91 and 92 are fitted at the base end of the shaft 90 supported by the guide body 89, and a coil spring 93 is fitted between the two linking arms. Linking arm 92
A coil spring 94 is inserted between the guide member 89 and one of the upright portions of the guide body 89 . The pattern selection solenoid 95 is fixed to the bracket arm 23 by a mounting plate 96, and one end of a bifurcated arm 97 pivotally mounted to the mounting plate 96 is connected to the armature of the solenoid 95 via a link 98. The prong is fitted onto the shaft 90 between the other upright portion of the guide body 89 and the linking arm 91 . The connecting arms 91, 92 are always held at the position shown in FIG. 6 by the action of the coil springs 93, 94, and in this position, the operating levers 58,
2 from below, and when the pattern selection solenoid 95 is temporarily energized by pressing the push button 26 or 27, it is moved to the position shown by the two-dot chain line. In addition, 99 is the solenoid 95
It is a rod connected at one end to Amathia,
The other end is connected to a brake member (not shown) for the aforementioned adjustment dials 33 and 34, and when the solenoid 95 is energized, the action of the brake member is released, and both adjustment dials 33 and 34 are connected to each other. It acts to return to a predetermined position. Since this operating mode has no relation to the present invention, further explanation will be omitted.

a shaft 1 fixed within the bracket arm 23;
A pair of actuating forks 101 and 102 are rotatably mounted on 00, and the upper and lower legs of each actuating fork are offset laterally. A pair of operating cams 103 and 104 each having two cam surfaces that engage with the upper and lower legs of each of the operating forks are fixed to the main shaft 105 of the sewing machine, and as the main shaft rotates, the The actuating forks 101 and 102 are swung. Coil springs 106 and 107 having strong spring force are provided between the actuating prongs 101 and the linking arm 91 and between the actuating prongs 102 and the linking arm 92, respectively.
are connected. A rotating arm 108 and an intermediate arm 109 are each pivotally mounted within the bracket arm 23, and one end of the intermediate arm is connected to the moving lever 85 via a rod 110. The aforementioned push button 28 is held in the inactive position shown in FIG. 2 by the action of a coil spring 111 inserted between the display board 25 and the bracket arm 23, and its rear end is connected to the rotating arm 23. 10
One end of 8 faces the upright portion 112 . Furthermore, the rotating arm 108 has two other upright portions 113, 1
14 is formed, one upright portion 113 facing one side edge of the intermediate arm 109, and the other upright portion 114 facing the tip of a linking arm 115 pivotally connected to the bracket arm 23. . A locking solenoid 116 is fixed to the bracket arm 23 so that its position can be adjusted, and its armature is connected to the link arm 115. A coil spring 117 biases the rotating arm 108 counterclockwise in FIG. 2, and another coil spring 118 biases the intermediate arm 109 clockwise in the figure. and,
The coil spring 117 has a stronger spring force than the coil spring 118, and the rotating arm 108 and the intermediate arm 10
9. The link arm 115 is always held in the position shown in FIG. 2, and the contact 77 is located opposite the second disc 42. When the solenoid 116 is excited by pressing the push button 31, the linking arm 115 is moved by an angle corresponding to the stroke of the armature, and the rotating arm 108 is rotated against the action of the coil spring 117. Ru. Therefore,
The intermediate arm 109 rotates in a follow-up manner due to the action of the coil spring 118, and the rod 110 and the moving lever 85
The contact 77 is moved through the cam member 84 to face the flat surface 82 of the cam member 84. On the other hand, when the push button 28 is operated, the rotating arm 108 is rotated further than when the solenoid 116 is energized, and the contact 77 is moved to face the second flat surface 83 of the cam member 84. be done.

Next, referring to FIG. 8, the housing of the step motor 39 includes a light emitter (for example, a light emitting diode) and a light receiving element (for example, a phototransistor) that face each other with the second disk 42 in between. A detector 127 is attached, and a slit 128 is formed in the second disk 42. When the slit faces the detector 127, an output signal is generated. At this time, the first and second contacts 51, 77 are configured to face portions of the first and second disks 41, 42 corresponding to the straight seam S1. The relative positions of the two discs and the contacts are set as reference positions.

Furthermore, FIG. 12 shows a curve X showing the vertical reciprocating movement of the needle 37, a curve Y showing the vertical reciprocating movement of the feed dog, and curves Z and V showing the vertical reciprocating movement of the actuating forks 101 and 102, respectively. is expressed relative to the rotation angle of the main axis. As is clear from this diagram, each of the actuating prongs 101, 102 swings with a rest angle of about 150 degrees at its top dead center,
And they move with an angular phase difference of about 110 degrees from each other. Additionally, this diagram represents the output signal RP generated by a rotation detector (not shown) mounted in the bracket arm of the sewing machine.

9 to 11 regarding the following main parts of the present invention.
This will be explained with reference to the figures.

The drive shaft 150 is rotatably mounted within the bed 22, and is rotated in conjunction with the rotation of the main shaft 105 to drive a known full-rotation hook (not shown). The intermediate shaft 151 is rotatably mounted on the bed 22 parallel to the drive shaft 150, and a horizontal feed cam 152, a vertical feed cam 153, and a driven gear 154 are integrally formed on the shaft and are rotatable. is installed on. The driven gear 154 is connected to the drive shaft 1
The rotation of the drive shaft 150 causes the two feed cams 152, 1 to mesh with the drive gear 155 fixed to the
53 are both rotated at a reduced speed. The horizontal feed arm 156 is rotatably attached to the bed 22 at its lower end, and a feed base 158 to which the aforementioned feed dog 38 is fixed by a shaft 157 is attached to its upper end. The swinging fork 159 is connected to the horizontal feed arm 1 by a shaft 160.
56 , and its two pronged portions fit into the horizontal feed cam 152 . The feed adjustment shaft 161 is rotatably mounted on the bed 22 by a bearing 162, and a feed adjuster 164 having a groove 163 is fixed to its left end, and a linking arm 16 is fixed to its right end.
5 is fixed. The linking arm is connected to the link 7 shown in FIG. 4 via a linking means not shown.
2. The feed regulator 1
A sliding block 166 that fits into the groove 163 of 64
is supported by a pin 167 fixed to the upper arm of the swinging fork 159. Further, the feed table 158 is operatively related to the vertical feed cam 153, and the rotation of the cam causes the feed dog 38 to
is swung to move up and down.

The above configuration is well known and operates in a known manner to apply a feed movement to the work cloth by means of the feed dog in accordance with the setting operation of the feed adjuster 164. Further, a driven member 168 made of an elastic material is fixed to the feed adjuster 161 via a collar 169, and
A pair of engaging portions 17 spaced apart from each other with 61 in between
It has a value of 0,170. A drive body 171 made of a synthetic resin material is formed with a long hole 172,
It is inserted into the intermediate shaft 151 through the elongated hole. The movable arm 173 is supported by the drive shaft 150 and connected to the drive body 171 by one arm 174 thereof. The operating cam 175 is inserted into the intermediate portion 151 adjacent to the horizontal feed cam 152, and a protrusion 176 formed on the left end of the operating cam 175 is inserted into the intermediate portion 151 adjacent to the horizontal feed cam 152.
The horizontal feed cam 152 rotates integrally with the horizontal feed cam 152 .
The other arm of the movable arm 173 is formed with an engaging portion 179 that faces the cam surface 178 of the operating cam 175, and a coil stretched between the arm 174 and a plate 180 fixed to the bed 22. Due to the action of the spring 181, it is in contact with the cam surface 178. Further, the driving part body 171 includes the driven part body 16.
Shoulder portions 182 are formed to face the pair of engaging portions 170, 170 of No.8. Therefore, due to the rotation of the operating cam 175, the drive body 171 reciprocates using the intermediate shaft 151 as a guide, and the shoulder portion 182
approaches the engaging portion 170 and moves away from the engaging portion. Therefore, the driven part body 168, the driving part body 171, the moving arm 173 and the actuating cam 175
etc. constitute a forced movement means that operates in a manner to be described later.

The operating cam 175 rotates exactly once per rotation of the main shaft 105, and due to the rotation of the operating cam 175, the drive body 171 rotates from the vicinity of time T0 when the rotation angle of the main shaft is 100 degrees in FIG. It performs a reciprocating motion up to the vicinity of time T4 at 280 degrees, and takes the maximum forward position at time T2 when the rotation angle of the main shaft is 190 degrees. The drive body 1
71 is closest to the driven part body 168, the feed adjustment shaft 161 is moved so that the engaging part 170 of the driven part body 168 is closest to the shoulder part 182.
Rotation is possible only within an angular range in which it does not engage. In other words, when the feed adjuster 164 is set outside the operating range corresponding to the angular range of the feed adjustment shaft 161, the forward movement of the drive body 171 causes its shoulder 182 to move toward the position of the driven body 168. The feed adjuster 1 contacts one of the pair of engaging portions 170, 170, and
64 is forcibly moved within the operation range. In this embodiment, the operating range is approximately 1 mm of the normal feed amount between the operating position where the feed amount is set to 0.
This corresponds to the range limited by the position where the reverse feed amount is set and the position where the reverse feed amount is approximately 1 mm. Also,
When the driving part body 171 is in the maximum retracted state, the driving part body does not interfere with the movement of the driven part body 168, and the feed adjuster 164 is at a position where the maximum normal feed amount is set to about 4 mm. It can be freely operated within the maximum adjustment operation range between the position where the maximum reverse feed amount is set to approximately 4 mm. The setting operation of the feed adjuster 164 is performed using the second disk 42 described above.
This is performed in conjunction with the vertical reciprocating motion of the needle according to the height of the uneven portion of the needle, and its operation mode will be explained below in relation to other mechanisms.

3 to 5 show the positional relationship of each member just before the needle reaches its uppermost point. As the actuating fork 101 moves upward as the main shaft 105 of the sewing machine rotates, the linking arm 91 moves upward and moves the actuating lever 58. After that, since the brake member 73 is acting on the swinging body 55, the operating lever 58 first rotates around the pin 57, and the swinging arm 52 rotates against the weak coil spring 81. let As a result, the pivot point of the buffer piece 59 approaches the pin 57, and the buffer piece 59 is rotated against the coil spring 60, resulting in the state shown in FIG. 3. When the linking arm 91 moves further upward from this state, the swinging member 55, the operating lever 58, and the swinging arm 52 are prevented from relative movement therebetween, and rotate integrally. Therefore, when the needle bar 36 is swung laterally through the link 69 and the contactor 51 engages with the opposing concavo-convex portion of the first disk 41 (the fourteenth
(see figure), the lateral position corresponding to the height of the uneven portion is reached and positioned. Subsequent operation fork 1
Coil spring 1 raises 01 and stops at the highest position.
06 extension.

Meanwhile, the other actuating fork 102, which had previously remained in the uppermost position, begins to descend, causing the link arm 92 to pivot counterclockwise from the position shown in FIG. Although no positive braking action is applied to the second rocker body 56, some resistance acts against the movement of the coupling means between it and the feed regulator 164. With the relative rotation between the operating lever 62, the swing arm 53, and the swing body 56, the contact 77 is released from the second disk 42 by the action of the coil spring 79, as shown in FIG. reach the state where it is. Subsequent linking arm 92
When descending, the swing arm 56 continues to rotate with the swing body 56 almost stopped, and the contactor 77 further rises slightly. At this time, the buffer piece 63 is rotated by the action of the coil spring 64, and its cam surface is always kept in contact with the lower surface of the swinging member 56.

The above-described separation of the contactor 77 from the disk 42 is as follows:
The process is completed before time T1 in FIG. 12, and at that time T1, the step motor 39 is operated in a predetermined sequence for each stitch pattern by an appropriate drive control means, as shown in FIG. It is therefore step-driven. When the step motor 39 is driven, the first contact 51 engages with the first disc 41 by the action of the coil spring 106,
The second contactor 77 is separated from the second disk 42 by the action of the coil spring 79. Therefore, when the step motor 39 is driven and its output shaft 40 rotates during operation of the sewing machine, the second disc 42
rotates together with its output shaft, but the first disc 41 cannot rotate and is stopped against the action of the coil spring 47 or 48. The relative rotation of the second disk 42 with respect to the first disk 41 is controlled by the intermediate body 44 having through holes 45 and 46 formed in both cam bodies and a protruding shoulder portion 43 fitted in both of the through holes. , and the coiled spring 4
7,48. That is, when the output shaft 40 of the step motor 39 is rotated clockwise in FIG. conversely, when the output shaft 40 is rotated counterclockwise, only the second disc 42 is wound while the first disc 41 and the intermediate body 44 are stopped. It is rotated against the action of spring 47.

Thereafter, when the first actuating prong 101 is lowered and the first contact 51 is separated from the first disc 41, the disc 41 is moved to the second disc 42 by the action of the coil spring 47 or 48. in the state shown in FIGS. 3 and 4, with the protruding shoulder 43 of the intermediate body 44 at one side edge of the through holes 45, 46 of each disc 41, 42. It becomes engaged. The operation mode when the linking arm 91 is lowered from the position shown in FIG. 14 by the lowering movement of the actuating fork 101 is as follows. That is, since the movement of the swinging member 55 is prevented by the action of the brake member 73, the operating lever 58 rotates about the pin 57 under the action of the coil spring 81, and the swinging arm 52 and the contact The child 51 rotates around the shaft 50. At this time, the buffer piece 59 rotates due to the action of the coil spring 60, and elastically holds the swinging member 55 between its cam surface and the pin 57. Therefore, when the contact 51 is detached from the disc 41, the needle does not move laterally, and the contact 51 does not move laterally.
The occurrence of impact noise is prevented as much as possible when engaging with the disc 41.

The second actuating prong 102 rises in tandem with the downward movement of the actuating prong 101, and the second contact 77
engages with the opposing concavo-convex portions of the second disc 42 by the action of the coil spring 107. By engaging the contactor 77, the swinging member 56 is positioned according to the height of the uneven portion, and the feed adjuster is positioned via the link 72 at a position corresponding to the height. The engagement of the contact 77 with the disc 42 and the dissociation of the contact 51 from the disc 41 are performed before time T3 in FIG. 12, and the step motor 39 is demagnetized at that time T3. In this way, the operating cam 103, the operating fork 101, the linking arm 91
The operating lever 58 and the like control the engagement and disengagement of the contact 51 with respect to the disc 41 in relation to the rotation of the main shaft 105 of the sewing machine, and the retrieval of the needle position information recorded on the disc 41 by the contact. The information retrieval control means is configured to perform the operation. Similarly, the operating cam 104 and the operating forks 10
2. The linking arm 92, the operating lever 62, etc. constitute a second information retrieval control means that causes the contactor 77 to perform the retrieval operation of the feed information recorded on the disk 42 in relation to the rotation of the main shaft of the sewing machine. are doing.

When the push button 31 is pressed during operation of the sewing machine, the stop stitch solenoid 116 is energized and the step drive of the step motor 39 is interrupted. By energizing the solenoid 116, the second contactor 77 is moved to face the flat surface 82 of the cam member 84, and performs an engagement/disengagement motion with respect to the flat surface 82. In contrast, the first contact 5
1 performs an engagement/disengagement motion with respect to the same concavo-convex portion of the first disc 41 that was facing when the step drive of the step motor 39 was interrupted. Therefore, the locking stitch is performed by the push button 3 at a needle position corresponding to the uneven portion and a minute reverse feed amount corresponding to the flat surface 82.
Executed for 1 press. Further, when the push button 28 is pressed while the sewing machine is operating, the contact 7
7 is moved to face the flat portion 83 of the cam member 84 and performs an engagement/disengagement movement with respect to the flat surface 83. At this time, the first disk 41 is rotated in steps according to a predetermined sequence without interrupting the step drive of the step motor 39. Therefore, reverse stitching is performed with a constant large backward feed amount.

By the way, the contactor 77 for the second disc
The manner in which the forcible moving means operates when the feed adjuster is set by engagement will be described below.

As can be understood from the time chart shown in FIG.
starts moving forward. As the actuating fork 102 moves downward, the contact 77 separates from the disc 42 and the swinging member 56 moves. Movement of the swinging member causes rotation of the feed adjuster 161 via the coupling means including the link 72 and the linking arm 165, causing the driven member 168 to rotate clockwise in FIG. Therefore, one engaging portion 170 of the driven body 168 comes into contact with the shoulder portion 182 of the driving body 171 that has moved forward, and the rotation of the driven body 168 and the feed adjustment shaft 161 is stopped. After that, on the contrary, the drive body 171 moves further forward.
the feed adjustment shaft 1 via the driven member 168.
61 in the counterclockwise direction in the figure. Corresponding to the stoppage and subsequent rotation of the feed adjustment shaft 161, the swinging member 56 stops and rotates in FIG. 15. It will be fully understood from the above description that the series of movements of the swinging member body 56 does not interfere with the movements of the swinging arm 53 and the contactor 77.

Then, at a time point T2 after the actuating fork 102 changes from a downward movement to an upward movement, the driving part body 171 advances the most, and the feed adjustment shaft 161 is moved within a predefined angular range via the driven part body 168. to be located. Therefore, the feed regulator 164 is located within a predefined operating range at the time T2. The subsequent upward movement of the actuating fork 102 causes the contactor 77 to engage with the disc 42 in the manner described above, and in conjunction with the backward movement of the drive body 171, the setting operation of the feed regulator 164 is carried out. be exposed. To explain the setting operation, if the height of the uneven portion of the disc 42 with which the contactor 77 is to engage corresponds to the setting of the feed adjuster 164 outside the pre-limited operation range, Before the contactor 77 engages with the uneven portion of the disc 42, the elastic force of the coil spring 107 is applied to the shoulder portion 182 of the driving member 171 during the backward movement of the engaging portion 170 of one of the driven member 168. contact through. Therefore, the subsequent engagement movement of the contactor 77 and rotation of the feed adjustment shaft 161 are performed following the backward movement of the drive unit body 171, and the contactor 77 engages with the opposing uneven portion. By doing so, the feed adjustment shaft 16
1 stops rotating, and the feed adjuster 164 is set to the corresponding operating position. The drive body 171 is further retracted and reaches the most retracted position at time T4 in FIG. 12, and remains at the retracted position during the subsequent rotation of the main shaft by about 180 degrees.

The aforementioned detachment and engagement movements of the contactor 77 with respect to the disc 42, the reciprocating movement of the drive body 171, etc. are carried out when the feeding operation of the feed dog 38 to the work cloth is completed and the feed dog sinks from the bed surface. It is done in between. The swinging body 56 cooperates with the information retrieval control means in order to operate the feed adjuster 164 in accordance with the feed information retrieved from the disk 42 by the contactor 77; Both constitute actuating means for setting and operating the feed regulator 164. Further, since the driven member 168 is made of an elastic material and the drive member 168 is made of a synthetic resin material, impact noise when the two come into contact is alleviated.

In this way, the feed regulator 1 by said actuating means
64, the feed adjuster is once moved within a pre-limited operating range, so that during the setting operation of the feed adjuster, the feed adjuster changes from the maximum forward feed setting position to the maximum reverse feed setting position, for example. The setting position is not operated in one step. Therefore, the amount of setting operation of the feed adjuster 164 is reduced, allowing quick setting and stable positioning of the feed adjuster. Furthermore, the feed regulator 16
Since the setting operation No. 4 is performed following the backward movement of the drive unit body 171, the feed adjuster 164 does not pass the setting position corresponding to the feed information, and is positioned more stably. Therefore, even when the sewing machine is operating at high speed, the feed dog can stably feed the workpiece cloth, and a beautiful stitch pattern can be formed.

By the way, if the height of the uneven portion of the disc 42 with which the contactor 77 is to engage corresponds to the setting of the feed adjuster 164 within the pre-limited operation range, the drive section During the backward movement of the body 171, the driven body 168 does not come into contact with its driving body. In that case, the feed regulator 16
Since the amount of setting operation in step 4 is small, the setting operation can be performed stably, and forming a satin step is one example of this.

Finally, the pattern selection operation of the sewing machine in this embodiment will be briefly explained.

When the push button 26 or 27 is pressed,
The pattern selection solenoid 95 is temporarily energized,
Thereafter, the step motor 39 is driven. Due to the energization of the solenoid 95, the linking arms 91 and 92 are moved to the two-dot chain line position in FIG. Therefore, the contacts 51 and 77 are moved against the disk 4 by the action of the coil springs 81 and 79, respectively.
Dissociates from 1,42. Immediately thereafter, the solenoid 95 is demagnetized, and the forked arm 97 immediately returns to its original position. At this time, if the actuating prongs 101 are at the lowest position and therefore the linking arm 91 is at the lowest position, the linking arm 91 will be moved so that its cam surface faces the actuating lever 58 due to the action of the coil spring 93. However, in other cases, the actuating lever 58 comes into contact with the side surface of the actuating lever 58 and is prevented from returning to the operating position. In addition, in any of the above cases, the second linking arm 92 is connected to the coil spring 9.
4, if the linking arm 92 is at the lowest position, its cam surface will be moved to face the actuating lever 62; otherwise, the side surface of the actuating lever 62 will move. comes into contact with.
As mentioned above, each of these linking arms 91, 92,
Since the main shaft of the sewing machine always reaches the lowest position once during each revolution, it returns to the working position within one revolution of the main shaft thereafter.

Thus, when the contacts 51, 77 are in the disengaged state, both the discs 41, 42 are connected to the step motor 3.
9, and when the desired shape of the stitch pattern is indicated by the display lamp 29, if the push button 26 or 27 is released, the uneven portion corresponding to the stitch pattern in each disc is rotated. The rotation of the disks 41, 42 is stopped in a state where the leading edge of the pattern faces each of the contacts 51, 77. In this way, the pattern selection operation is completed, and the manner in which stitches are formed when the sewing machine starts operating thereafter will be understood from the above description.

In the embodiment described above, the synchronizing means for reciprocating the driving body 171 in synchronization with the vertical reciprocating motion of the needle is the actuating cam 175 and the movable arm 173.
However, it is also possible to configure the synchronizing means using an electromagnetic solenoid instead. Further, in this embodiment, the feed information for forming various stitch patterns is recorded on the disk 42 so that it can be taken out as a mechanical displacement amount, and the feed information for forming various stitch patterns is recorded on the disk 42 so that it can be taken out as a mechanical displacement amount, and the feed information is directly The present invention is applied to a sewing machine in which the adjuster 164 is configured to be set and operated.
As disclosed in Publication No. 101161, sending information is stored in a static storage means so that it can be taken out as an electrical code signal, and the taken out code signal is converted into a mechanical displacement amount through an appropriate conversion device. The present invention is also applicable to a sewing machine configured such that the feed adjuster 164 is set and operated based on the amount of displacement. In that case, the conversion device no longer needs to be controlled in a closed loop.

As is clear from the above description, the present invention is directed to the operation of an actuating means that operates in conjunction with the up and down reciprocation of the needle in order to operate the feed adjuster in accordance with the feed information corresponding to each stitch pattern. In advance, a forced movement means is provided to temporarily act on the feed adjuster and forcibly move the feed adjuster within a predetermined operating range, and the feed operation of the feed dog with respect to the workpiece cloth is completed. When the actuating means performs the setting operation of the feed adjuster in order to control the next feed movement after the feed dog has sunk, the amount of operation is reduced as much as possible, and the feed adjuster is quickly set. operated and stably positioned in its operating position. Therefore, even when the sewing machine is operating at high speed, the feed adjuster sufficiently follows the operating speed of the sewing machine and is set within a predetermined period, so that the stitch pattern is not disturbed.

[Brief explanation of the drawing]

The drawings show an embodiment embodying the present invention; FIG. 1 is a perspective view showing the external appearance of the sewing machine, FIG. 2 is a plan view showing the main mechanism of the sewing machine with the top cover removed, and FIG. An enlarged front view showing the mechanism in Fig. 2 with the frame of the sewing machine removed, Fig. 4 is an enlarged sectional view taken approximately along line 4-4 in Fig. 2, and Fig. 5 is an enlarged sectional view taken approximately along line 5-5 in Fig. 2. 6 is an enlarged plan view showing the guide body and related members, FIG. 7 is an exploded perspective view showing the members constituting the main mechanism, and FIG. 8 is an illustration of the installation of both discs. FIG. 9 is an enlarged plan view showing the feeding mechanism with a part of the bed cut away, FIG. 10 is a right side view of FIG. 9, and FIG. 11 is an abbreviation of FIG. 9. 12 is a time chart for explaining the stitch forming operation, and FIG. 13 is a diagram for explaining the drive sequence of both disks in forming various stitch patterns. 14 and 15 are partial front views corresponding to FIGS. 3 and 4, respectively, for explaining the operating mode. In the figure, 37 is a needle, 38 is a feed dog, 42 is a disc,
53 is a swing arm, 54 is an intermediate arm, 56 is a swing body,
62 is an operating lever, 72 is a link, 77 is a contactor, 102 is an operating fork, 104 is an operating cam, 16
1 is a feed adjustment shaft, 164 is a feed adjuster, 168 is a driven part body, 170 is an engaging part, 171 is a drive part body,
173 is a moving arm, and 175 is an operating cam.

Claims (1)

[Claims] 1. An ordinary four-movement feed dog that moves in synchronization with the up and down reciprocation of the needle, and a desired adjustment within a predetermined maximum adjustment operation range to control the feed movement of the feed dog. A feed adjuster is operated to set the feed adjuster to the position, and in order to set and operate the feed adjuster according to the feed information corresponding to each stitch pattern, when the feed dog sinks in relation to the vertical reciprocating movement of the needle, actuating means for actuation; prior to activation of the actuating means and upon depression of the feed dog, acting temporarily on the feed adjuster to bring the feed adjuster into a predetermined operating range within the maximum adjustment operating range; and forced movement means for forcibly moving the feed dog, and when the feed dog has finished operating on the workpiece cloth and the feed dog is sinking, the actuating means is actuated to control the next feed movement. A feed setting device for a sewing machine, characterized in that the feed adjuster is always positioned within the predetermined operating range. 2. The forced movement means includes a driven member fixed to a shaft for setting and operating the feed adjuster, a driving member located opposite to the driven member so as to be able to engage with the driven member, and a driving member that connects the driving member to the needle. A feed setting device for a sewing machine according to claim 1, comprising synchronizing means for reciprocating in synchronization with the vertical reciprocating motion. 3. Claim 2, wherein the driven member has a pair of engaging parts that are spaced apart from each other with the shaft in between and are located opposite to the drive member, and is made of an elastic material. Feed setting device for the sewing machine described in Section 1. 4. The synchronizing means comprises an operating cam that rotates in synchronization with the up and down reciprocation of the needle, and a movable arm that is operatively connected to the drive body and moves back and forth based on the rotation of the operating cam. A feed setting device for a sewing machine according to scope 2. 5. The synchronizing means includes an operating cam that rotates in synchronization with the up and down reciprocation of the needle, and the rotation of the operating cam causes the driving part body to move forward, and the feed adjuster is adjusted to the predetermined position via the driven part body. When the feed adjuster is operated to set by once moving it within the limited operation range and then operating the actuating means, the driven part body engages with the driving part body which is moving back due to the rotation of the actuating cam. The feed setting of the sewing machine according to claim 2, wherein the cam shape of the operating cam is configured such that the feed adjuster is set and operated in a follow-up manner as the drive unit moves backward thereafter. Device.