EP2617884B1 - Cloth feed adjusting device of sewing machine - Google Patents
Cloth feed adjusting device of sewing machine Download PDFInfo
- Publication number
- EP2617884B1 EP2617884B1 EP13151760.9A EP13151760A EP2617884B1 EP 2617884 B1 EP2617884 B1 EP 2617884B1 EP 13151760 A EP13151760 A EP 13151760A EP 2617884 B1 EP2617884 B1 EP 2617884B1
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- EP
- European Patent Office
- Prior art keywords
- feed
- adjusting
- cam
- pitch
- cam member
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000004744 fabric Substances 0.000 title claims description 53
- 238000009958 sewing Methods 0.000 title claims description 47
- 230000008859 change Effects 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims 1
- 239000011295 pitch Substances 0.000 description 151
- 230000007246 mechanism Effects 0.000 description 63
- 230000033001 locomotion Effects 0.000 description 58
- 230000005540 biological transmission Effects 0.000 description 16
- 230000007935 neutral effect Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 8
- 230000009467 reduction Effects 0.000 description 7
- 238000001514 detection method Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 230000010355 oscillation Effects 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05D—HINGES OR SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS
- E05D15/00—Suspension arrangements for wings
- E05D15/06—Suspension arrangements for wings for wings sliding horizontally more or less in their own plane
- E05D15/0621—Details, e.g. suspension or supporting guides
- E05D15/0626—Details, e.g. suspension or supporting guides for wings suspended at the top
- E05D15/063—Details, e.g. suspension or supporting guides for wings suspended at the top on wheels with fixed axis
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B27/00—Work-feeding means
- D05B27/02—Work-feeding means with feed dogs having horizontal and vertical movements
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B3/00—Window sashes, door leaves, or like elements for closing wall or like openings; Layout of fixed or moving closures, e.g. windows in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
- E06B3/32—Arrangements of wings characterised by the manner of movement; Arrangements of movable wings in openings; Features of wings or frames relating solely to the manner of movement of the wing
- E06B3/34—Arrangements of wings characterised by the manner of movement; Arrangements of movable wings in openings; Features of wings or frames relating solely to the manner of movement of the wing with only one kind of movement
- E06B3/42—Sliding wings; Details of frames with respect to guiding
- E06B3/46—Horizontally-sliding wings
- E06B3/4663—Horizontally-sliding wings specially adapted for furniture
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
- E05Y2201/00—Constructional elements; Accessories therefor
- E05Y2201/60—Suspension or transmission members; Accessories therefor
- E05Y2201/622—Suspension or transmission members elements
- E05Y2201/688—Rollers
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
- E05Y2600/00—Mounting or coupling arrangements for elements provided for in this subclass
- E05Y2600/60—Mounting or coupling members; Accessories therefor
- E05Y2600/626—Plates or brackets
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
- E05Y2900/00—Application of doors, windows, wings or fittings thereof
- E05Y2900/20—Application of doors, windows, wings or fittings thereof for furniture, e.g. cabinets
Definitions
- the present invention relates to a cloth feed adjusting device of a sewing machine including two adjusting members.
- a cloth feeding device of a typical sewing machine includes a feed adjusting body capable of adjusting a motion transmission amount thereof along a pathway through which a feeding motion is transmitted from a cloth feeding driving source to a feed dog.
- a feed adjusting body capable of adjusting a motion transmission amount thereof along a pathway through which a feeding motion is transmitted from a cloth feeding driving source to a feed dog.
- This feed adjusting body is configured such that, when this feed adjusting body is at a neutral angle, the stitch pitch is 0, and when the feed adjusting body is turned in a given direction from the neutral angle, the stitch pitch in a forward feed direction increases from 0, and when the feed adjusting body is turned in the opposite direction from the neutral angle, the stitch pitch in a backward feed direction increases from 0.
- the cloth feed adjusting mechanism configured to be able to switch between two stitch pitches which are individually set, so as to selectively use the stitch pitch depending on the application of the sewing.
- the cloth feed adjusting mechanism includes two adjusting members which separately set different stitch pitches in advance corresponding to the different angles of the above-described feed adjusting body, and is configured to be able to switch from a stitch pitch set by one of the feed adjusting members to a stitch pitch set by the other feed adjusting member at the time of switching the stitch pitch.
- Fig. 16 shows a cloth feed adjusting mechanism 100 described in JP 2007-202667 A .
- the cloth feed adjusting mechanism 100 includes a first adjusting member 101 and a second adjusting member 102 configured to move forward or backward by dialing operations, a first cam member 103 having a lower end supported by a machine frame in a rotatable manner by a pivot 109, receiving a rotational force in a clockwise direction in Fig.
- a coil spring 107 configured to turn when pushed by a tip end portion 101A of the first adjusting member 101
- a second cam member 104 having an intermediate portion supported by the machine frame in a rotatable manner by a pivot 110, and is configured to turn when pushed by a tip end portion 102A of the second adjusting member 102
- a feed adjusting arm 106 having a single contact pin 105 capable of contacting cam portions 103A, 104A of the first cam member 103 and the second cam member 104, and an action arm 108 coupled to the second cam member 104 to move to the left in Fig. 16 due to an action of an air cylinder (not shown).
- the feed adjusting arm 106 is coupled to a feed adjusting body (not shown) of the feeding device, and when the feed adjusting arm 106 turns, the feed adjusting body also turns in an interlocking manner.
- the cam portions 103A, 104A of the respective cam members 103, 104 are both formed in substantially V shapes in which the both sides of the valley portions are sloping portions, and the valley portions are at intermediate positions which set the feed adjusting body at a neutral position.
- One of the sloping portions of each the cam portions 103A, 104A is formed such that the stitch pitch in the forward feed direction increases as it separates from the intermediate position, and the other sloping portion of each of the cam portions is formed such that the stitch pitch in the backward feed direction increases as it separates from the intermediate position.
- the first cam member 103 receives a rotational force in a clockwise direction by the coil spring 107, to contact the first adjusting member 101, and the second cam member 104 retracts so as not to contact the second adjusting member 102.
- the cam portion 104A of the second cam member 104 is located on the rear side (on the right side in Fig. 16 ) than the cam portion 103A of the first cam member 103, so as to separate from the contact pin 105, and the cam portion 103A of the first cam member 103 contacts the contact pin 105, to perform cloth feeding at a stitch pitch set by the first adjusting member 101.
- the cam portion 104A of the second cam member 104 is located further forward (on the left side in Fig. 16 ) than the cam portion 103A of the first cam member 103 by an actuation of the air cylinder, and the second cam member 104 is turned in a clockwise direction in Fig. 16 so as to bring the second cam member 104 into contact with the second adjusting member 102. Then, the cam portion 104A of the second cam member 104 engages the contact pin 105, and the stitch pitch set by the first adjusting member 101 is switched to the stitch pitch set by the second adjusting member 102. Then, the mechanism returns to the aforementioned normal condition by stopping the actuation of the air cylinder.
- this cloth feed adjusting mechanism 100 is further equipped with an air cylinder which receives an operation of the switching button for backward feeding, to turn the contact pin 105 of the feed adjusting arm 106 from the sloping portions on the forward feeding side to the sloping portions on the backward feeding side in the respective cam portions 103A, 104A, thereby switching the feed direction.
- the contact pin 105 and the cam portion slide on each other from when the contact pin 105 engages the cam portion of the other cam member until the other cam member engages the tip end portion of the corresponding adjusting member. Accordingly, the air cylinder for switching motion is required to have an output corresponding to the resistance by sliding friction between the contact pin and the cam portion. This is the same also when different actuating means such as an electromagnet is used in place of the air cylinder. Further, because the cam member or the contact pin becomes worn by sliding, and this causes a change in a stitch pitch, an adjustment becomes necessary, thereby leading to a problem that the maintenance efficiency is lowered.
- An object of the present invention is to facilitate a stitch pitch switching operation.
- a cloth feed adjusting device includes a first cam member supported by machine frame in a rotatable manner by a first pivot, a second cam member supported by the machine frame in a rotatable manner by a second pivot, a first adjusting member configured to move forward or backward by being operated, and to push the first cam member to regulate a rotational position of the first cam member, a second adjusting member configured to move forward or backward by being operated, and when the second adjusting member contacts the second cam member, the second adjusting member pushes the second cam member to regulate a rotational position of the second cam member, a pitch switching actuator coupled to the second cam member and configured to cause the second cam member to contact or separate from the second adjusting member, and a control unit configured to drive the pitch switching actuator.
- the first cam member has a first cam portion which is formed such that a first forward feed adjusting portion capable of setting a stitch pitch in a forward feed direction and a first backward feed adjusting portion capable of setting a stitch pitch in a backward feed direction face each other and have a border at an intermediate position at which a stitch pitch becomes 0.
- the second cam member has a second cam portion which is formed such that a second forward feed adjusting portion capable of setting a stitch pitch in the forward feed direction and a second backward feed adjusting portion capable of setting a stitch pitch in the backward feed direction face each other and have a border at an intermediate position at which a stitch pitch becomes 0.
- the cloth feed adjusting device further includes a turning unit having a contact portion capable of contacting one of the first cam portion and the second cam portion, and supported so as to be rotatable about one axis with respect to the machine frame to change, in accordance with a rotation angle thereof, the stitch pitch in a range from a forward feeding to a backward feeding, and a feed direction switching actuator configured to rotate the turning unit such that the contact portion moves between the forward feed adjusting portion and the backward feed adjusting portion of one of the first and second cam portions, thereby switching the stitch direction from one of the forward feed direction and the backward feed direction to the other, and at the time of starting the operation of the pitch switching actuator, the control unit drives the feed direction switching actuator in a range in which the stitch direction is not switched.
- a cloth feed adjusting device includes a cam member supported by a machine frame in a rotatable manner by a pivot, a first adjusting member configured to move forward or backward when operated, and to push the cam member to regulate a rotational position of the cam member, a second adjusting member configured to move forward or backward when operated, a pitch switching actuator coupled to the cam member, and configured to cause the cam member to contact or separate from the second adjusting member, and a control unit configured to drive the pitch switching actuator.
- the cam member has a cam portion which is formed such that a forward feed adjusting portion capable of adjusting a stitch pitch in a forward feeding when contacted by the contact portion and a backward feed adjusting portion capable of adjusting a stitch pitch in a backward feeding when contacted by the contact portion face each other and have a border at an intermediate position at which a stitch pitch becomes 0.
- the cloth feed adjusting device further includes a turning unit having a contact portion capable of contacting the cam portion, and supported so as to be rotatable about one axis with respect to the machine frame to change, in accordance with a rotation angle thereof, the stitch pitch in a range from the forward feeding to the backward feeding, and a feed direction switching actuator configured to rotate the turning unit such that the contact portion moves between the forward feed adjusting portion and the backward feed adjusting portion of the cam portion, thereby switching the stitch direction from one of the forward feed direction and the backward feed direction to the other, and at the time of starting the operation of the pitch switching actuator, the control unit drives the feed direction switching actuator in a range in which the stitch direction is not switched.
- the cloth feed adjusting device may further include detecting means for detecting a predetermined operation amount of the feed direction switching actuator, and the control unit may perform the operation of the feed direction switching actuator at the time of starting the operation of the pitch switching actuator until the detecting means detects the predetermined operation amount.
- the cloth feed adjusting device may further include clocking means for measuring an operation time of the feed direction switching actuator, and the control unit may perform the operation of the feed direction switching actuator at the time of starting the operation of the pitch switching actuator until the clocking means measures a predetermined operation time.
- first, the first and second adjusting members are operated, to determine the respective forward and backward positions. At this time, the first cam member is in contact with the first adjusting member, and the second cam member is spaced away from the second adjusting member.
- the feed direction switching actuator When switching to a stitch pitch set by the second adjusting member from a state in which a stitch pitch set by the first adjusting member is selected, the feed direction switching actuator is, simultaneously with the pitch switching actuator, driven in a range in which the stitch direction is not switched. As a result, the contact portion moves from one of the forward feed adjusting portion and the backward feed adjusting portion to the other. Because the pitch switching actuator performs the operation of switching of the cam members at that time, sliding contact between the contact portion and the cam portion of the second cam member is avoided or reduced. Accordingly, sliding friction is reduced, and it becomes possible for even a small pitch switching actuator having a small output to easily perform a stitch pitch switching operation.
- first and second adjusting members are operated to determine the respective forward and backward positions. At this time, the cam member contacts the first adjusting member, and is spaced away from the second adjusting member.
- the feed direction switching actuator When switching the stitch pitch to a stitch pitch set by the second adjusting member from a state in which a stitch pitch set by the first adjusting member is selected, the feed direction switching actuator is, simultaneously with the pitch switching actuator, driven in a range in which the stitch direction is not switched.
- the contact portion moves from one of the forward feed adjusting portion and the backward feed adjusting portion to the other.
- the pitch switching actuator turns the cam member to switch the contact position between the contact portion and the cam portion at that time, sliding contact between the contact portion and the cam portion is avoided or reduced. Accordingly, sliding friction is reduced, and the load on the pitch switching actuator is reduced, which makes it possible to use a small pitch switching actuator having a small output.
- a sewing machine 10 includes a sewing machine frame 20 (machine frame) which is composed of a bed portion 21 having a bed surface horizontally extending so as to be flat and slender, a vertical drum portion 22 installed upright and upward from one end portion in a longitudinal direction of the sewing machine bed portion 21, and an arm portion (not shown) extending in the same direction so as to face the upper side of the bed portion 21 from the upper end portion of the vertical drum portion 22.
- a sewing machine frame 20 (machine frame) which is composed of a bed portion 21 having a bed surface horizontally extending so as to be flat and slender, a vertical drum portion 22 installed upright and upward from one end portion in a longitudinal direction of the sewing machine bed portion 21, and an arm portion (not shown) extending in the same direction so as to face the upper side of the bed portion 21 from the upper end portion of the vertical drum portion 22.
- the longitudinal direction of the bed portion 21 is defined as the Y-axis direction
- the horizontal direction perpendicular to the Y-axis direction is defined as the X-axis direction
- the vertical direction perpendicular to the X-axis direction and the Y-axis direction is defined as the Z-axis direction.
- a throat plate 11 in which an eye through which a sewing needle is inserted, and a through hole 11a from and into which a feed dog 41 of the feeding device 40 which will be described later comes out and gets back are formed, is provided on the top surface of the bed portion 21, and a cloth presser 19 which is supported by a cloth presser bar 18 is disposed at a position immediately above the eye and the through hole 11a of the throat plate 11.
- an upper shaft 12 is installed along the Y-axis direction in the arm portion, and is coupled to a sewing machine motor 16 ( Fig. 9 ) provided outside the arm portion, to be driven to rotate.
- the upper shaft 12 gives an up-down movement to a needle bar which holds the sewing needle with its lower end portion, via a crank mechanism (not shown).
- a geared pulley 14 is fixedly mounted to the end portion on the vertical drum portion 22 side, and a timing belt 13 for transmitting rotary drive force to a up-down feed shaft 43 of the feeding device 40 is placed around the pulley 14.
- the sewing machine motor 16 may be coupled to the upper shaft 12 via a coupling, or may transmit torque via a transmission mechanism such as gears.
- a shuttle mechanism 30 includes a shuttle shaft 32 supported rotatably so as to be along the Y-axis direction in the bed portion 21.
- the shuttle shaft 32 holds a well-known full rotary shuttle 31 at one end portion, and is coupled to the up-down feed shaft 43 via a gear mechanism 60 at the opposite end portion, to be driven to rotate.
- the gear mechanism 60 includes a drive gear 61 fixedly mounted to the up-down feed shaft 43 and a driven gear 62 fixedly mounted to the shuttle shaft 32, to mesh with the drive gear 61.
- the number of gear teeth of the drive gear 61 is twice as many as the number of gear teeth of the driven gear 62.
- the feeding device 40 includes a feed base 42 which fixedly holds the feed dog 41 at an intermediate portion in the longitudinal direction, an up-down feeding mechanism which reciprocates the feed base 42 in the vertical direction (Z-axis direction) by rotation of the up-down feed shaft 43, and a horizontal feeding mechanism which reciprocates the feed base 42 in a feed direction (X-axis direction) along the horizontal direction by rotation of the up-down feed shaft 43.
- the up-down feeding mechanism includes the up-down feed shaft 43 which is supported rotatably along the Y-axis direction in the bed portion 21, an eccentric cam 44 which is fixed to the up-down feed shaft 43, and a crank rod 45 which fits into the eccentric cam 44, and converts the rotation of the up-down feed shaft 43 into reciprocating drive force in the vertical direction, to transmit the force to the feed base 42.
- the up-down feed shaft 43 is disposed along the Y-axis direction in the bed portion 21, and supported rotatably by the machine frame.
- a geared pulley 15 around which the timing belt 13 is placed is fixed to one end portion of the vertical drum portion 22 side of the up-down feed shaft 43.
- the pulley 15 has the same number of gear teeth as that of the pulley 14 of the upper shaft which is mentioned above. That is, the pulley 14 and the pulley 15 rotate at a constant speed.
- crank rod 45 whose one end portion fits into the eccentric cam 44 is coupled rotatably to one end portion of the feed base 42 with the other end portion thereof, and reciprocates the one end portion of the feed base 42 in the vertical direction at a stroke twice as much as an eccentric amount thereof by the eccentric cam 44 when the up-down feed shaft 43 is fully rotated.
- the horizontal feeding mechanism that reciprocates the feed base 42 along the feed direction (X-axis direction) is disposed in parallel with the up-down feed shaft 43, and supported rotatably by the machine frame.
- the horizontal feeding mechanism includes a horizontal feed shaft 46 which interlocks with the up-down feed shaft 43, to turn in a reciprocating manner, a horizontal feed arm 47 which converts reciprocation-turning drive force of the horizontal feed shaft 46 into reciprocating drive force in the feed direction, to transmit the force to the feed base 42, and a transmission mechanism 48 which converts rotary drive force of the up-down feed shaft 43 into reciprocation-turning drive force, to transmit the force to the horizontal feed shaft 46.
- the transmission mechanism 48 will be described on the basis of Figs. 1 , 2 , and 4 .
- the transmission mechanism 48 includes an eccentric cam 49 fixed to the up-down feed shaft 43, a crank rod 50 whose one end portion is coupled to the up-down feed shaft 43 via the eccentric cam 49, an oscillating arm 51 which is fixed to the horizontal shaft 46, and a feeding amount variable portion 52 which couples the other end portion of the crank rod 50 and the oscillation end portion of the oscillating arm 51, and is capable of adjusting a width of a reciprocation-turning angle transmitted to the horizontal feed shaft 46.
- the crank rod 50 is disposed such that the longitudinal direction thereof is substantially along the X-axis direction, and its base end portion rotatably fits into the eccentric cam 49, and its tip end portion is coupled to the feeding amount variable portion 52.
- the tip end portion of the crank rod 50 performs a reciprocating motion along the longitudinal direction at a stroke twice as much as an eccentric amount thereof by the eccentric cam 49.
- This reciprocating motion of the crank rod 50 is transmitted as reciprocation-turning drive force to the horizontal feed shaft 46 via the feeding amount variable portion 52 and the oscillating arm 51.
- a substantially U-shaped feed adjusting body 55 is supported rotatably with respect to the sewing machine frame by a pivot 56 parallel to the horizontal shaft 46, and one ends of a pair of second link bodies 54 and 54 are supported rotatably by a pair of pivots 57A and 57B, at the both tip end portions of the feed adjusting body 55.
- the other ends of the pair of second link bodies 54 and 54 are coupled to and supported rotatably by a pivot 59 to which the tip end of the crank rod 50 is coupled rotatably. Moreover, the lower ends of a pair of first link bodies 53 are supported rotatably by the pivot 59, and the upper ends of the pair of first link bodies 53 are coupled rotatably to the tip end of the oscillating arm 51.
- the pivots 57A, 57B, and 59 are respectively parallel to the horizontal feed shaft 46.
- the feeding amount variable portion 52 includes the pair of first link bodies 53 which are coupled to the tip end portion of the crank rod 50 and the tip end portion of the oscillating arm 51, the pair of second link bodies 54 which guides a reciprocating motion direction of the other end portion of the crank rod 50 to any direction, and the feed adjusting body 55 which adjusts a guiding direction by the second link bodies 54.
- the feed adjusting body 55 when the feed adjusting body 55 is rotated to an angular position (a neutral position) at which the first link bodies 53 and the second link bodies 54 are overlapped in parallel, the drive force of the crank rod 50 is not transmitted to the oscillating arm 51, so as not to transmit the reciprocation-turning motion to the horizontal feed shaft 46, thereby making a stitch pitch 0.
- the horizontal feed shaft 46 is disposed further on the downstream side (on the left side in Figs. 2 and 3 ) in the cloth feed direction than the shuttle shaft 32.
- the feeding amount variable portion 52 is coupled to one end portion in the direction of axis on the vertical drum portion 22 side of the horizontal feed shaft 46, and reciprocation-turning drive force is given to the one end portion from the up-down feed shaft 43 via the feeding amount variable portion 52.
- the other end portion in the direction of axis of the horizontal feed shaft 46 is coupled to the horizontal feed arm 47, to transmit reciprocating drive force along the X-axis direction to the feed base 42 via the horizontal feed arm 47.
- the lower end portion (base end portion) of the horizontal feed arm 47 is fixedly coupled to the one end portion in the direction of axis of the horizontal feed shaft 46, and the upper end portion (oscillation end portion) of the horizontal feed arm 47 is coupled to the feed base 42.
- the feed base 42 is installed under the throat plate, and its end portion on the front side in the cloth feed direction (X-axis direction) is coupled to the up-down feed shaft 43 via the crank rod 45, and the end portion on the rear side in the cloth feed direction is coupled to the horizontal feed shaft 46 via the horizontal feed arm 47.
- the feed base 42 is attached so as to slightly bend (off-set) the end portion on the up-down feed shaft 43 side toward the vertical drum portion 22 side.
- a cloth feed adjusting mechanism 70 will be described based on Figs. 5 to 7B . In these drawings, the detailed configuration of the feeding amount variable portion 52 is omitted.
- the cloth feed adjusting mechanism 70 is capable of freely switching between setup stitch pitches of two different widths by matching the feed adjusting body 55 to two target turning angles, and is further capable of switching between the forward feed direction and the backward feed direction at the setup stitch pitches of the two different widths.
- the cloth feed adjusting mechanism 70 includes an input arm 71 which is fixedly mounted to the feed adjusting body 55 via the pivot 56, an adjustment shaft 72 which is supported rotatably so as to be along the X-axis direction in the bed portion 21, first and second feed adjusting arms 73, 74 which are fixedly mounted to the adjustment shaft 72, a link body 75 which couples the first feed adjusting arm 73 and the turning end portion of the input arm 71, first and second adjustment screw members 76, 77 (examples as first and second adjusting members) which configure the setting of stitch pitches by manual dialing operations, first and second cam members 78, 79 which are supported turnably around the X-axis in the bed portion 21, a pitch switching cylinder 80 (an example of a pitch switching actuator) that switches between the stitch pitches respectively set by the first and second adjustment screw members 76, 77, a direction switching cylinder 81 (an example of a feed direction switching actuator) that switches between the forward and backward sewing directions, and link bodies 82 to 84 and a switching arm
- the adjustment shaft 72, the first and second adjusting arms 73, 74, and the switching arm 85 are fixedly coupled to one another, so as to function as a turning unit 86 which integrally performs a turning motion around the X-axis in the bed portion 21.
- the input arm 71 radially extends centering around the pivot 56 along the X-axis direction.
- the first feed adjusting arm 73 as well radially extends centering around the adjustment shaft 72 along the X-axis direction, and these turning end portions of the input arm 71 and the first feed adjusting arm 73 are coupled to one another by the link body 75, thereby configuring a four-node link mechanism. That is, when turning is generated on the adjustment shaft 72 side, it is possible to interlock the feed adjusting body 55 to turn via the pivot 56.
- the first and second feed adjusting arms 73, 74 both include boss-shaped contact pins 731, 741 (examples as contact portions) which project along the X-axis direction on the side surface portions thereof. These contact pins 731, 741 are respectively configured to come into contact with cam portions 781, 791 of the first and second cam members 78, 79 which will be described later, to fix turning angles around the adjustment shaft 72 of the first or second feed adjusting arms 73, 74.
- the first and second adjustment screw members 76, 77 are composed of dial portions 761, 771 whose rotation operations are manually carried out, and shaft portions 762, 772 which make forward and backward movements by the rotation operations, and the dial portions 761, 771 are provided on the outer side surfaces of the sewing machine frame 20, and the shaft portions 762, 772 are supported with screw structures by the sewing machine frame 20.
- first and second adjustment screw members 76, 77 when rotation operations of the respective dial portions 761, 771 are carried out, the shaft portions 762, 772 make forward and backward movements, and the tip end portions thereof push the first and second cam members 78, 79, to turn those, thereby separately setting and inputting stitch pitches of different widths.
- these setup widths of the stitch pitches input from the first and second adjustment screw members 76, 77 are values in common in the forward feed direction and the backward feed direction, forward feeding and backward feeding are performed at the stitch pitches set by the first and second adjustment screw members 76, 77.
- the first and second cam members 78, 79 are respectively installed on the front side of the shaft portions 762, 772 inside the sewing machine frame 20.
- the first cam member 78 includes a turning shaft 782 (an example of a first pivot) extending along the X-axis direction at its lower end portion, and a flat contact surface 783, with which the shaft portion 762 contact in a pressed manner, is formed at a region facing the shaft portion 762.
- first cam member 78 is disposed adjacent to the first feed adjusting arm 73 in the X-axis direction, and the cam portion 781 formed at the upper portion of the cam member 78 engages the contact pin 731 of the first feed adjusting arm 73.
- the cam portion 781 is, as shown in Figs. 6A and 6B , a substantially V-shaped notch opening toward the first feed adjusting arm 73 side, and the respective members are assembled such that the feed adjusting body 55 is at the neutral angle with a stitch pitch of 0 in a state in which the contact pin 731 is in contact with the V-shaped bottom portion (innermost portion). That is, the V-shaped bottom portion in the cam portion 781 is an intermediate position 784 at which a stitch pitch is set to 0.
- sloping portions facing each other with the intermediate position 784 interposed therebetween are formed, and one of those (the upper portion in Figs. 6A and 6B ) is a forward feed adjusting portion 785 capable of adjusting the stitch pitch in the forward feed direction by contacting the contact pin 731 thereto. Further, the other sloping portion (the lower portion in Figs. 6A and 6B ) of the cam portion 781 is a backward feed adjusting portion 786 capable of adjusting the stitch pitch in the backward feed direction by contacting the contact pin 731 thereto.
- a contacting position of the contact pin 731 with respect to the cam portion 781 is determined according to a turning angle around the turning shaft 782 of the first cam member 78, and the turning angle of the first cam member 78 can be set by a rotation operation of the first adjustment screw member 76.
- the feed adjusting body 55 receives torque in the anticlockwise direction in Figs. 6A and 6B centering around the pivot 56 by the tension spring 58, thereby transmitting torque in the same direction to the first feed adjusting arm 73. Accordingly, when the first cam member 78 moves backward from the position shown in Fig. 6A to the position shown in Fig. 6B , the contact pin 731 moves along the forward feed adjusting portion 785. Accordingly, when the feed direction is switched to the backward feed direction, the adjustment shaft 72 is forcibly turned by the direction switching cylinder 81, to bring the contact pin 731 into contact with the backward feed adjusting portion 786. Thereby, turning the feed adjusting body 55 up to the backward feeding side over the neutral angle, makes it possible to perform sewing in the backward feed direction.
- the contact pin 731 is switched from a state in which the contact pin 731 is in contact with a predetermined position of the forward feed adjusting portion 785 to a state in which the contact pin 731 is in contact with a predetermined position of the backward feed adjusting portion 786.
- the shape of the cam portion 781 is designed such that the stitch pitch in the forward feed direction in the state in which the contact pin 731 is in contact with the predetermined position of the forward feed adjusting portion 785 and the stitch pitch in the backward feed direction in the state in which the contact pin 731 is in contact with the predetermined position of the backward feed adjusting portion 785 are equal in their pitch widths.
- the second cam member 79 extends in a state in which its longitudinal direction is substantially along the Z-axis direction, and includes a turning shaft 792 (an example of a second pivot) along the X-axis direction at a substantially intermediate position in the longitudinal direction, and a flat contact surface 793, with which the shaft portion 772 contacts in a pressed manner, is formed slightly above the turning shaft 792 and at a region facing the shaft portion 772.
- the second cam member 79 is disposed adjacent to the second feed adjusting arm 74 in the X-axis direction, and the cam portion 791 formed at the lower portion of the cam member 79 engages the contact pin 741 of the second feed adjusting arm 74.
- the cam portion 791 has, as shown in Figs. 7A and 7B , an intermediate position 794, a forward feed adjusting portion 795, and a backward feed adjusting portion 796 in the same way as the cam portion 781 of the first cam member 78. Because these have the structures which are the same as those of the cam portion 781 of the first cam member 78, descriptions thereof will be omitted.
- the upper end portion of the second cam member 79 is coupled to a plunger of the pitch switching cylinder 80 via a link body 801.
- the pitch switching cylinder 80 is, as shown in Fig. 7A , in a state in which the plunger is brought backward, thereby leading to a state in which the contact surface 793 of the second cam member 79 is separated from the tip end portion of the shaft portion 772 of the second adjustment screw member 77, so as to maintain a state in which the cam portion 791 as well is spaced from the contact pin 741 of the second feed adjusting arm 74. That is, in this state, not the stitch pitch set by the second adjustment screw member 77, but the stitch pitch set by the first adjustment screw member 76 is selected.
- the stitch pitch set by the second adjustment screw member 77 needs to be set to a value lower than the stitch pitch set by the first adjustment screw member 76. If the stitch pitch set by the second adjustment screw member 77 is set to be a higher value, even when a motion of switching to the second cam member 79 is performed by the pitch switching cylinder 80, the cam portion 791 does not reach the contact pin 741, which does not allow to switch to the stitch pitch set by the second adjustment screw member 77. That is, the second adjustment screw member 77 is for setting a small pitch.
- one end portion of the link body 82 is coupled to the plunger of the direction switching cylinder 81, and the other end portion of the link body 82 is coupled to one arm portion of a bell crank member 83 supported turnably by the bed portion 21.
- the other arm portion of the bell crank member 83 is coupled to one end portion of the link body 84, and the other end portion of the link body 84 is coupled to a turning step portion of the switching arm 85 fixedly mounted to the end portion of the adjustment shaft 72.
- a marking 821 is marked along the way of the above-described link body 82. This is marked for detecting a motion of the slight operation amount because it is necessary for the direction switching cylinder 81 to carry out driving in a slight operation amount to an extent that the sewing direction is not switched in pitch switching control which will be described later.
- an optical position detecting sensor 87 (an example of detecting means) that detects the marking 821 is installed together to the link body 82, and when the plunger of the direction switching cylinder 81 moves backward by a slight operation amount set in advance, the marking 821 enters the range of detection by the position detecting sensor 87, to output a detection signal.
- control for stopping the direction switching cylinder 81 so as not to cause a further motion is performed.
- the sewing machine 10 includes a control unit 90 which performs motion controls in the respective configurations.
- a solenoid valve 802 that controls the motion of the pitch switching cylinder 80, and a solenoid valve 811 that controls the motion of the direction switching cylinder 81 are connected to the control unit 90 via respective drive circuits 803 and 812, and the aforementioned position detecting sensor 87 installed together to the direction switching cylinder 81 as well is connected to the control unit 90.
- a pitch selecting switch 95 that switches the stitch pitch set by the first adjustment screw member 76 to the stitch pitch set by the second adjustment screw member 77
- a direction selecting switch 96 that switches between the forward and backward sewing directions are connected to the control unit 90 via an interface 97.
- the sewing machine motor 16 and an encoder 17 that detects the number of rotations of the sewing machine motor 16 are connected to the control unit 90 via a motor drive circuit 161.
- the control unit 90 includes a CPU 91, a ROM 92, a RAM 93, and an EEPROM 94, and controls the sewing machine motor 16 to keep a target speed while monitoring an output from the encoder 17.
- the cloth feed adjusting device of the present embodiment includes the cloth feed adjusting mechanism 70 and the control system shown in Fig. 9 .
- the control unit 90 controls the solenoid valve 811 to move the plunger of the direction switching cylinder 81 backward (ON in Fig. 10B ). Further, at the same time, the control unit 90 controls the solenoid valve 802 to move the plunger of the pitch switching cylinder 80 forward (ON in Fig. 10C ).
- the pitch switching cylinder 80 pushes the upper end portion of the second cam member 79, to move the cam portion 791 toward the contact pin 741 side.
- the pitch switching cylinder 80 is capable of smoothly performing the switching motion with a small output.
- the control unit 90 stops the actuation of the direction switching cylinder 81 simultaneously with this detection by the sensor (OFF in Fig. 10B ), and the plunger is returned into the forward-movement state.
- the contact pin 741 is returned before the contact pin 741 reaches the backward feed adjusting portion 796 of the cam portion 791, and the contact pin 741 contacts the forward feed adjusting portion 795, to set to the stitch pitch set by the second adjustment screw member 77.
- the direction switching cylinder 81 is, simultaneously with the pitch switching cylinder 80, driven within the range in which the sewing direction is not switched.
- the actuation of the direction switching cylinder 81 in the pitch switching control is preferably performed within the range in which the contact pin 741 does not reach the backward feed adjusting portion 796.
- the position detecting sensor 87 that detects that the direction switching cylinder 81 performs a motion to a certain range is provided, to perform the control for stopping the direction switching cylinder 81 upon detection by the position detecting sensor 87.
- the control for stopping the direction switching cylinder 81 is performed.
- the condition for stopping the direction switching cylinder 81 is not limited to an operation amount, and may be set according to an operation time, for example.
- a time shorter than the required operation time may be determined as an actuation time of the direction switching cylinder 81, to perform the control for stopping the direction switching cylinder 81 at a point in time of passage of the actuation time.
- the control for stopping the actuation of the direction switching cylinder 81 is performed.
- FIG. 11 As a second embodiment, another example of a cloth feed adjusting mechanism will be described based on Figs. 11 and 13 .
- illustration of the feed adjusting body 55 is omitted, and only the pivot 56 thereof is illustrated.
- the feed adjusting body 55 and the feeding device 40 have the mechanisms which are the same as those in the first embodiment.
- the aforementioned cloth feed adjusting mechanism 70 includes the two feed adjusting arms 73, 74, and the two cam members 78, 79. However, this cloth feed adjusting mechanism 70A is different from the cloth feed adjusting mechanism 70 in the point that a single feed adjusting arm and a single cam member are used.
- the cloth feed adjusting mechanism 70A includes an input arm 71A which is fixedly mounted to the feed adjusting body 55 via the pivot 56, an adjustment shaft 72A which is supported rotatably so as to be along the X-axis direction in the bed portion 21, a feed adjusting arm 73A which is fixedly mounted to the adjustment shaft 72A, a link body 75A which couples the feed adjusting arm 73A and the turning end portion of the input arm 71A, first and second adjustment screw members 76A, 77A (examples as first and second adjusting members) which configure the setting of stitch pitches by manual dialing operations, a cam member 78A which is supported turnably around the X-axis in the bed portion 21, a pitch switching cylinder 80A (an example of a pitch switching actuator) that switches between stitch pitches respectively set by the first and second adjustment screw members 76A, 77A, a direction switching cylinder 81A (an example of a feed direction switching actuator) that switches between the forward and backward sewing directions, and a switching arm 85A which
- the adjustment shaft 72A, the feed adjusting arms 73A, and the switching arm 85A are fixedly coupled to one another, and function as a turning unit 86A which integrally perform a turning motion around the X-axis in the bed portion 21.
- the input arm 71A radially extends centering around the pivot 56 along the X-axis direction.
- the input arm 71A is capable of being interlocked with the feed adjusting arm 73A capable of turning around the X-axis by the link body 75A.
- the feed adjusting arm 73 includes a boss-shaped contact pin 731A (an example of a contact portion) which projects along the X-axis direction on the side surface portion thereof, and is configured to contact a cam portion 781A of the cam member 78A, to fix a turning angle around the adjustment shaft 72A of the feed adjusting arm 73A.
- a boss-shaped contact pin 731A an example of a contact portion
- the first and second adjustment screw members 76A, 77A have substantially the same structures as the aforementioned adjustment screw members 76, 77. Accordingly, the first and second adjustment screw members 76A, 77A include shaft portions 762A, 772A which make forward and backward movements by rotation operations of dial portions 761A, 771A.
- first and second adjustment screw members 76A, 77A as well, normally, sewing is performed at the stitch pitch set by the first adjustment screw member 76A, it is possible to switch the stitch pitch to the stitch pitch set by the second adjustment screw member 77A by an actuation of the pitch switching cylinder 80A.
- the first and second adjustment screw members 76A, 77A are the same as those of the respective adjustment screw members 76, 77.
- first and second adjustment screw members 76A, 77A are disposed one above the other such that the first adjustment screw member 76A is on the upper side, on the side surface of the sewing machine frame.
- the cam member 78A is installed on the front side of the shaft portions 762A, 772A arranged one above the other inside the sewing machine frame 20.
- first and second contact surfaces 787A, 788A with which the shaft portions 762A, 772A respectively come into contact are provided one above the other, and a turning shaft 782A (an example of a pivot) along the X-axis direction is included between the contact surfaces 787A, 788A.
- a torsion coil spring 789A which pushes the first contact surface 787A of the cam member 78A in a direction in which first contact surface 787A firmly presses the first adjustment screw member 76A is attached to the turning shaft 782A.
- the cam member 78A is disposed adjacent to the feed adjusting arm 73A in the X-axis direction, and the cam portion 781A formed in the vicinity of the end portion on the opposite side of the respective contact surfaces 787A, 788A of the cam member 78A engages the contact pin 731A of the feed adjusting arm 73A.
- the cam portion 781A of the cam member 78A is formed so as to be perforated into a substantially triangle with respect to the cam member 78A forming a plate shape.
- a region corresponding to one side of the triangle is a forward feed adjusting portion 785A
- a region corresponding to one side which faces adjacent to the forward feed adjusting portion 785A is a backward feed adjusting portion 786A
- a region corresponding to the vertex between the adjusting portions 785A, 786A is an intermediate position 784A.
- This cloth feed adjusting mechanism 70A has the feature that, as mentioned above, the cam member 78A and the feed adjusting arm 73A are each composed of one member, to achieve switching of setup stitch pitches by the two adjustment screw members 76A, 77A.
- the contact pin 731A shown by the solid line in Fig. 13 indicates a contacting position with respect to the forward feed adjusting portion 785A at that time.
- the pitch switching cylinder 80A is actuated, and the plunger pushes the top surface in the vicinity of the rear end portion of the cam member 78A downward.
- the cam member 78A turns in the anticlockwise direction in the drawing centering around the turning shaft 782A, to switch to a state in which the contact surface 788A firmly presses the second adjustment screw member 77A.
- the contact pin 731A moves toward the intermediate position 784A while sliding over the forward feed adjusting portion 785A (the contact pin 731A by the alternate long and two short dashed line), and therefore, the feed adjusting arm 73A (not shown in Fig. 13 ) engaging the contact pin 731A turns in the clockwise direction in Fig. 13 .
- the feed adjusting body 55 along with the feed adjusting arm 73A, to switch to the stitch pitch set by the second adjustment screw member 77A.
- the direction switching cylinder 81A gives turning in the arrow direction (the clockwise direction) in Fig. 12 to the switching arm 85A at the time of switching from forward feeding to backward feeding.
- the feed adjusting arm 73A along with the switching arm 85A in a clockwise direction, to move the contact pin 731A to a position of 731R in Fig. 13 .
- bringing the contact pin 731A into contact with the backward feed adjusting portion 786A to be able to turn the feed adjusting body 55 so as to perform backward feeding at the setup stitch pitch.
- the pitch switching control in the cloth feed adjusting mechanism 70A with such a configuration will be described.
- a marking is attached to a forward and backward motion region in the same way as the direction switching cylinder 81 mentioned above, and a slight motion to an extent that forward feeding is not switched to backward feeding is detected by a position detecting sensor.
- the pitch switching cylinder 80A and the direction switching cylinder simultaneously start actuations.
- the contact pin 731 A is spaced from the forward feed adjusting portion 785A of the cam portion 781A by the direction switching cylinder, and simultaneously, the cam member 78A is turned by the pitch switching cylinder 80A. Therefore, the contact pin 731A moves to the setting position by the second adjustment screw member 77A without sliding over the forward feed adjusting portion 785A.
- the transmission mechanism 48 which converts rotary drive force of the up-down feed shaft 43 into reciprocation-turning drive force, to transmit the force to the horizontal feed shaft 46
- the aforementioned cloth feed adjusting mechanisms 70 and 70A are both applicable not only to the transmission mechanism 48, but also to a transmission mechanism 48B shown hereinafter.
- the same reference numerals are given for the same configuration of the sewing machine 10 mentioned above, and overlapping descriptions will be omitted.
- the transmission mechanism 48B includes an eccentric cam 49B fixedly mounted to the up-down feed shaft 43, a crank rod 50B whose one end portion is coupled to the up-down feed shaft 43 via the eccentric cam 49B, an oscillating arm 51B which is fixedly mounted to the horizontal shaft 46, to oscillate centering around the horizontal shaft 46, and a feeding amount variable portion 52B which couples the other end portion of the crank rod 50B and the oscillation end portion of the oscillating arm 51B, and is capable of adjusting a width of a reciprocation-turning angle transmitted to the horizontal feed shaft 46.
- the feeding amount variable portion 52B includes a link body 53B whose one end portion in the longitudinal direction is coupled to the oscillation end portion of the oscillating arm 51B, and whose intermediate portion is coupled to the other end portion of the crank rod 50B, a pair of square pieces 54B which are held by the other end portion of the link body 53B, a feed adjusting body 55B having a guide groove 551B that guides the square pieces 54B, and a pivot 56B which allows the feed adjusting body 55B to be turnable around the Y-axis.
- the link body 53B is coupled turnably around the Y-axis to the oscillating arm 51B, the square pieces 54B, and the crank rod 50B respectively with the both end portions and the intermediate portion.
- crank rod 50B Because the other end portion of the crank rod 50B is coupled to the intermediate portion of the link body 53B, when the up-down feed shaft 43 rotates, a reciprocating motion containing a vertical direction component is given to the link body 53B.
- the square pieces 54B are attached to the other end portion of the link body 53B, and the square pieces 54B are structured so as to regulate its moving direction by the guide groove 551B formed in the feed adjusting body 55B.
- the guide groove 551B When the feed adjusting body 55B is turned in any direction from the neutral angle, the guide groove 551B is inclined in an oblique direction, and therefore, a reciprocating motion component in a right and left direction (in the X-axis direction) is generated in the link body 53B, and this is transmitted to the turning end portion of the oscillating arm 51B as well, thereby transmitting the turning motion to the horizontal feed shaft 46 as well.
- a stroke of the reciprocation-turning transmitted to the horizontal feed shaft 46 varies according to an angular variation amount of the feed adjusting body 55B from the neutral angle.
- the feed adjusting body 55B is turned in the clockwise direction or the anticlockwise direction from the neutral angle, the phase of the reciprocating motion transmitted to the horizontal feed shaft 46 is inverted. Accordingly, it is possible to optionally adjust stitch pitches in the forward direction and the backward direction according to turning angles in the respective directions.
- the aforementioned cloth feed adjusting mechanisms 70, 70A are able to function in all the same ways as the transmission mechanism 48 by mounting the input arms 71, 71A to the pivot 56B in the transmission mechanism 48B.
- first and second adjustment screw members have been described as examples of the first and second adjusting members in the embodiment described above, one or both of the first and second adjusting members may not necessarily have a screw structure in so far as they move forward or backward when operated.
- the pitch switching cylinder and the direction switching cylinder have been described as examples of the pitch switching actuator and the feed direction switching actuator in the embodiment described above, one or both of the pitch switching actuator and the feed direction switching actuator may be actuators other than the cylinders.
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Description
- The present invention relates to a cloth feed adjusting device of a sewing machine including two adjusting members.
- A cloth feeding device of a typical sewing machine includes a feed adjusting body capable of adjusting a motion transmission amount thereof along a pathway through which a feeding motion is transmitted from a cloth feeding driving source to a feed dog. By turning the feed adjusting body to change its angle, it is possible to adjust a stitch pitch (a feeding amount). This feed adjusting body is configured such that, when this feed adjusting body is at a neutral angle, the stitch pitch is 0, and when the feed adjusting body is turned in a given direction from the neutral angle, the stitch pitch in a forward feed direction increases from 0, and when the feed adjusting body is turned in the opposite direction from the neutral angle, the stitch pitch in a backward feed direction increases from 0.
- Further, there is know a cloth feed adjusting mechanism configured to be able to switch between two stitch pitches which are individually set, so as to selectively use the stitch pitch depending on the application of the sewing. For example, the cloth feed adjusting mechanism includes two adjusting members which separately set different stitch pitches in advance corresponding to the different angles of the above-described feed adjusting body, and is configured to be able to switch from a stitch pitch set by one of the feed adjusting members to a stitch pitch set by the other feed adjusting member at the time of switching the stitch pitch.
- For example,
Fig. 16 shows a clothfeed adjusting mechanism 100 described inJP 2007-202667 A feed adjusting mechanism 100 includes a first adjustingmember 101 and a second adjustingmember 102 configured to move forward or backward by dialing operations, afirst cam member 103 having a lower end supported by a machine frame in a rotatable manner by apivot 109, receiving a rotational force in a clockwise direction inFig. 16 by acoil spring 107, and configured to turn when pushed by atip end portion 101A of the first adjustingmember 101, asecond cam member 104 having an intermediate portion supported by the machine frame in a rotatable manner by a pivot 110, and is configured to turn when pushed by atip end portion 102A of the second adjustingmember 102, afeed adjusting arm 106 having asingle contact pin 105 capable of contactingcam portions first cam member 103 and thesecond cam member 104, and anaction arm 108 coupled to thesecond cam member 104 to move to the left inFig. 16 due to an action of an air cylinder (not shown). - The
feed adjusting arm 106 is coupled to a feed adjusting body (not shown) of the feeding device, and when thefeed adjusting arm 106 turns, the feed adjusting body also turns in an interlocking manner. - When the
contact pin 105 of thefeed adjusting arm 106 contacts thecam portions second cam members feed adjusting arm 106, and the stitch pitch is adjusted to a stitch pitch corresponding to the contacting positions. - The
cam portions respective cam members cam portions contact pin 105 moves along the sloping portions on both sides facing each other with the intermediate position interposed therebetween, the feed adjusting body turns in the forward and backward respective directions, to adjust the setting of a stitch pitch. - Normally, as shown in
Fig. 16 , thefirst cam member 103 receives a rotational force in a clockwise direction by thecoil spring 107, to contact the first adjustingmember 101, and thesecond cam member 104 retracts so as not to contact the second adjustingmember 102. In this state, thecam portion 104A of thesecond cam member 104 is located on the rear side (on the right side inFig. 16 ) than thecam portion 103A of thefirst cam member 103, so as to separate from thecontact pin 105, and thecam portion 103A of thefirst cam member 103 contacts thecontact pin 105, to perform cloth feeding at a stitch pitch set by the first adjustingmember 101. - When a switching button is pressed in this state, the
cam portion 104A of thesecond cam member 104 is located further forward (on the left side inFig. 16 ) than thecam portion 103A of thefirst cam member 103 by an actuation of the air cylinder, and thesecond cam member 104 is turned in a clockwise direction inFig. 16 so as to bring thesecond cam member 104 into contact with the second adjustingmember 102. Then, thecam portion 104A of thesecond cam member 104 engages thecontact pin 105, and the stitch pitch set by the first adjustingmember 101 is switched to the stitch pitch set by the second adjustingmember 102. Then, the mechanism returns to the aforementioned normal condition by stopping the actuation of the air cylinder. Further, this clothfeed adjusting mechanism 100 is further equipped with an air cylinder which receives an operation of the switching button for backward feeding, to turn thecontact pin 105 of thefeed adjusting arm 106 from the sloping portions on the forward feeding side to the sloping portions on the backward feeding side in therespective cam portions - However, in a conventional cloth feed adjusting mechanism of a sewing machine, at the time of switching the stitch pitch in accordance with an actuation or no actuation of the air cylinder, from the state in which the
cam portion 103A (104A) of one of the cam members 103 (and 104) is in contact with thecontact pin 105, the other cam member 104 (103) is rotated from when thecam portion 104A (103A) of the other cam member 104 (103) engages thecontact pin 105 until the other cam member 104 (103) engages thetip end portion 102A (101A) of the corresponding adjusting member 102 (101). Therefore, thecontact pin 105 and the cam portion slide on each other from when thecontact pin 105 engages the cam portion of the other cam member until the other cam member engages the tip end portion of the corresponding adjusting member. Accordingly, the air cylinder for switching motion is required to have an output corresponding to the resistance by sliding friction between the contact pin and the cam portion. This is the same also when different actuating means such as an electromagnet is used in place of the air cylinder. Further, because the cam member or the contact pin becomes worn by sliding, and this causes a change in a stitch pitch, an adjustment becomes necessary, thereby leading to a problem that the maintenance efficiency is lowered. - An object of the present invention is to facilitate a stitch pitch switching operation.
- A cloth feed adjusting device according to an aspect of the present invention includes a first cam member supported by machine frame in a rotatable manner by a first pivot, a second cam member supported by the machine frame in a rotatable manner by a second pivot, a first adjusting member configured to move forward or backward by being operated, and to push the first cam member to regulate a rotational position of the first cam member, a second adjusting member configured to move forward or backward by being operated, and when the second adjusting member contacts the second cam member, the second adjusting member pushes the second cam member to regulate a rotational position of the second cam member, a pitch switching actuator coupled to the second cam member and configured to cause the second cam member to contact or separate from the second adjusting member, and a control unit configured to drive the pitch switching actuator. The first cam member has a first cam portion which is formed such that a first forward feed adjusting portion capable of setting a stitch pitch in a forward feed direction and a first backward feed adjusting portion capable of setting a stitch pitch in a backward feed direction face each other and have a border at an intermediate position at which a stitch pitch becomes 0. The second cam member has a second cam portion which is formed such that a second forward feed adjusting portion capable of setting a stitch pitch in the forward feed direction and a second backward feed adjusting portion capable of setting a stitch pitch in the backward feed direction face each other and have a border at an intermediate position at which a stitch pitch becomes 0. The cloth feed adjusting device further includes a turning unit having a contact portion capable of contacting one of the first cam portion and the second cam portion, and supported so as to be rotatable about one axis with respect to the machine frame to change, in accordance with a rotation angle thereof, the stitch pitch in a range from a forward feeding to a backward feeding, and a feed direction switching actuator configured to rotate the turning unit such that the contact portion moves between the forward feed adjusting portion and the backward feed adjusting portion of one of the first and second cam portions, thereby switching the stitch direction from one of the forward feed direction and the backward feed direction to the other, and at the time of starting the operation of the pitch switching actuator, the control unit drives the feed direction switching actuator in a range in which the stitch direction is not switched.
- A cloth feed adjusting device according to another aspect of the present invention includes a cam member supported by a machine frame in a rotatable manner by a pivot, a first adjusting member configured to move forward or backward when operated, and to push the cam member to regulate a rotational position of the cam member, a second adjusting member configured to move forward or backward when operated, a pitch switching actuator coupled to the cam member, and configured to cause the cam member to contact or separate from the second adjusting member, and a control unit configured to drive the pitch switching actuator. The cam member has a cam portion which is formed such that a forward feed adjusting portion capable of adjusting a stitch pitch in a forward feeding when contacted by the contact portion and a backward feed adjusting portion capable of adjusting a stitch pitch in a backward feeding when contacted by the contact portion face each other and have a border at an intermediate position at which a stitch pitch becomes 0. The cloth feed adjusting device further includes a turning unit having a contact portion capable of contacting the cam portion, and supported so as to be rotatable about one axis with respect to the machine frame to change, in accordance with a rotation angle thereof, the stitch pitch in a range from the forward feeding to the backward feeding, and a feed direction switching actuator configured to rotate the turning unit such that the contact portion moves between the forward feed adjusting portion and the backward feed adjusting portion of the cam portion, thereby switching the stitch direction from one of the forward feed direction and the backward feed direction to the other, and at the time of starting the operation of the pitch switching actuator, the control unit drives the feed direction switching actuator in a range in which the stitch direction is not switched.
- The cloth feed adjusting device may further include detecting means for detecting a predetermined operation amount of the feed direction switching actuator, and the control unit may perform the operation of the feed direction switching actuator at the time of starting the operation of the pitch switching actuator until the detecting means detects the predetermined operation amount.
- The cloth feed adjusting device may further include clocking means for measuring an operation time of the feed direction switching actuator, and the control unit may perform the operation of the feed direction switching actuator at the time of starting the operation of the pitch switching actuator until the clocking means measures a predetermined operation time.
- In the case of a configuration in which two different stitch pitches are set by using the first and second cam members, first, the first and second adjusting members are operated, to determine the respective forward and backward positions. At this time, the first cam member is in contact with the first adjusting member, and the second cam member is spaced away from the second adjusting member.
- When switching to a stitch pitch set by the second adjusting member from a state in which a stitch pitch set by the first adjusting member is selected, the feed direction switching actuator is, simultaneously with the pitch switching actuator, driven in a range in which the stitch direction is not switched. As a result, the contact portion moves from one of the forward feed adjusting portion and the backward feed adjusting portion to the other. Because the pitch switching actuator performs the operation of switching of the cam members at that time, sliding contact between the contact portion and the cam portion of the second cam member is avoided or reduced. Accordingly, sliding friction is reduced, and it becomes possible for even a small pitch switching actuator having a small output to easily perform a stitch pitch switching operation.
- Further, due to a reduction in sliding friction, it becomes possible to more quickly perform a stitch pitch switching operation.
- Moreover, due to a reduction in sliding friction, it becomes possible to reduce wear between the contact portion and the cam portion, which makes it possible to improve durability and maintenance efficiency.
- In the case of a configuration in which two different stitch pitches are set by using one cam member, first, the first and second adjusting members are operated to determine the respective forward and backward positions. At this time, the cam member contacts the first adjusting member, and is spaced away from the second adjusting member.
- When switching the stitch pitch to a stitch pitch set by the second adjusting member from a state in which a stitch pitch set by the first adjusting member is selected, the feed direction switching actuator is, simultaneously with the pitch switching actuator, driven in a range in which the stitch direction is not switched. As a result, in the cam portion of the cam member, the contact portion moves from one of the forward feed adjusting portion and the backward feed adjusting portion to the other. Because the pitch switching actuator turns the cam member to switch the contact position between the contact portion and the cam portion at that time, sliding contact between the contact portion and the cam portion is avoided or reduced. Accordingly, sliding friction is reduced, and the load on the pitch switching actuator is reduced, which makes it possible to use a small pitch switching actuator having a small output.
- Further, due to a reduction in sliding friction, it becomes possible to more quickly perform a stitch pitch switching operation.
- Moreover, due to a reduction in sliding friction, it becomes possible to reduce wear between the contact portion and the cam portion, which makes it possible to improve durability and maintenance efficiency.
- Further, in the case of a configuration in which detecting means for detecting a predetermined operation amount of the feed direction switching actuator is included, an appropriate operation amount of the pitch switching actuator is detected by the detecting means, and it is possible to perform a more secure motion, which makes it possible to improve reliability of the mechanism.
- Further, in the case of a configuration in which clocking means for measuring an operation time of the feed direction switching actuator is included, an appropriate motion timing of the pitch switching actuator is detected by the clocking means, and it is possible to perform a more secure motion, which makes it possible to improve reliability of the mechanism.
- The following description of embodiments of the present invention describes the present invention in greater detail along with the drawings. The drawings include:
- Fig. 1:
- a plan view showing a configuration inside a bed portion of a sewing machine;
- Fig. 2:
- a cross sectional view taken along V-V in
Fig. 1 ; - Fig. 3:
- a cross sectional view taken along W-W in
Fig. 1 ; - Fig. 4:
- a perspective view of a transmission mechanism;
- Fig. 5:
- a perspective view of a cloth feed adjusting mechanism;
- Fig. 6A:
- a motion explanatory diagram of a first cam member where a contact pin is at an intermediate position, viewed from the Y-axis direction;
- Fig. 6B:
- a motion explanatory diagram of the first cam member setting a stitch pitch in a forward feed direction, viewed from the Y-axis direction;
- Fig. 7A:
- a motion explanatory diagram of a second cam member retracting from a second adjusting member, viewed from the Y-axis direction;
- Fig. 7B:
- a motion explanatory diagram of the second cam member in contact with the second adjusting member, viewed from the Y-axis direction;
- Fig. 8A:
- an explanatory diagram illustrating the stopped state of a direction switching cylinder;
- Fig. 8B:
- an explanatory diagram illustrating an actuating state in a slight operation amount of the direction switching cylinder;
- Fig. 9:
- a block diagram of a control system of the sewing machine;
- Fig. 10:
- a timing chart in pitch switching control;
- Fig. 11:
- a perspective view of another example of a cloth feed adjusting mechanism;
- Fig. 12:
- an exploded perspective view of the cloth feed adjusting mechanism of
Fig. 11 ; - Fig. 13:
- a side view of a cam member of the cloth feed adjusting mechanism of
Fig. 11 ; - Fig. 14:
- an exploded perspective view of the transmission mechanism;
- Fig. 15:
- a motion explanatory diagram of another example of the transmission mechanism; and
- Fig. 16:
- a side view of a conventional cloth feed adjusting mechanism.
- Hereinafter, a sewing machine including a cloth feed adjusting device according to a first embodiment of the present invention will be described in detail with reference to
Figs. 1 to 9 . - A
sewing machine 10 includes a sewing machine frame 20 (machine frame) which is composed of abed portion 21 having a bed surface horizontally extending so as to be flat and slender, a vertical drum portion 22 installed upright and upward from one end portion in a longitudinal direction of the sewingmachine bed portion 21, and an arm portion (not shown) extending in the same direction so as to face the upper side of thebed portion 21 from the upper end portion of the vertical drum portion 22. - In the following description, the longitudinal direction of the
bed portion 21 is defined as the Y-axis direction, the horizontal direction perpendicular to the Y-axis direction is defined as the X-axis direction, and the vertical direction perpendicular to the X-axis direction and the Y-axis direction is defined as the Z-axis direction. - As shown in
Fig. 3 , athroat plate 11 in which an eye through which a sewing needle is inserted, and a throughhole 11a from and into which afeed dog 41 of thefeeding device 40 which will be described later comes out and gets back are formed, is provided on the top surface of thebed portion 21, and acloth presser 19 which is supported by acloth presser bar 18 is disposed at a position immediately above the eye and the throughhole 11a of thethroat plate 11. - As shown in
Fig. 2 , anupper shaft 12 is installed along the Y-axis direction in the arm portion, and is coupled to a sewing machine motor 16 (Fig. 9 ) provided outside the arm portion, to be driven to rotate. Theupper shaft 12 gives an up-down movement to a needle bar which holds the sewing needle with its lower end portion, via a crank mechanism (not shown). Further, a gearedpulley 14 is fixedly mounted to the end portion on the vertical drum portion 22 side, and atiming belt 13 for transmitting rotary drive force to a up-downfeed shaft 43 of thefeeding device 40 is placed around thepulley 14. - The
sewing machine motor 16 may be coupled to theupper shaft 12 via a coupling, or may transmit torque via a transmission mechanism such as gears. - As shown in
Figs. 1 to 3 , ashuttle mechanism 30 includes ashuttle shaft 32 supported rotatably so as to be along the Y-axis direction in thebed portion 21. Theshuttle shaft 32 holds a well-known fullrotary shuttle 31 at one end portion, and is coupled to the up-downfeed shaft 43 via agear mechanism 60 at the opposite end portion, to be driven to rotate. - The
gear mechanism 60 includes adrive gear 61 fixedly mounted to the up-downfeed shaft 43 and a drivengear 62 fixedly mounted to theshuttle shaft 32, to mesh with thedrive gear 61. The number of gear teeth of thedrive gear 61 is twice as many as the number of gear teeth of the drivengear 62. - As shown in
Figs. 2 and3 , thefeeding device 40 includes afeed base 42 which fixedly holds thefeed dog 41 at an intermediate portion in the longitudinal direction, an up-down feeding mechanism which reciprocates thefeed base 42 in the vertical direction (Z-axis direction) by rotation of the up-downfeed shaft 43, and a horizontal feeding mechanism which reciprocates thefeed base 42 in a feed direction (X-axis direction) along the horizontal direction by rotation of the up-downfeed shaft 43. - The up-down feeding mechanism includes the up-down
feed shaft 43 which is supported rotatably along the Y-axis direction in thebed portion 21, aneccentric cam 44 which is fixed to the up-downfeed shaft 43, and acrank rod 45 which fits into theeccentric cam 44, and converts the rotation of the up-downfeed shaft 43 into reciprocating drive force in the vertical direction, to transmit the force to thefeed base 42. - The up-down
feed shaft 43 is disposed along the Y-axis direction in thebed portion 21, and supported rotatably by the machine frame. A gearedpulley 15 around which thetiming belt 13 is placed is fixed to one end portion of the vertical drum portion 22 side of the up-downfeed shaft 43. Thepulley 15 has the same number of gear teeth as that of thepulley 14 of the upper shaft which is mentioned above. That is, thepulley 14 and thepulley 15 rotate at a constant speed. - Further, the
crank rod 45 whose one end portion fits into theeccentric cam 44 is coupled rotatably to one end portion of thefeed base 42 with the other end portion thereof, and reciprocates the one end portion of thefeed base 42 in the vertical direction at a stroke twice as much as an eccentric amount thereof by theeccentric cam 44 when the up-downfeed shaft 43 is fully rotated. - The horizontal feeding mechanism that reciprocates the
feed base 42 along the feed direction (X-axis direction) is disposed in parallel with the up-downfeed shaft 43, and supported rotatably by the machine frame. The horizontal feeding mechanism includes ahorizontal feed shaft 46 which interlocks with the up-downfeed shaft 43, to turn in a reciprocating manner, ahorizontal feed arm 47 which converts reciprocation-turning drive force of thehorizontal feed shaft 46 into reciprocating drive force in the feed direction, to transmit the force to thefeed base 42, and atransmission mechanism 48 which converts rotary drive force of the up-downfeed shaft 43 into reciprocation-turning drive force, to transmit the force to thehorizontal feed shaft 46. - Due to the motions of these up-down feeding mechanism and the horizontal feeding mechanism, a cloth intermittent feed motion in units of a predetermined stitch pitch by a well-known feeding movement (elliptic movement) is made with respect to the
feed dog 41. - The
transmission mechanism 48 will be described on the basis ofFigs. 1 ,2 , and4 . - The
transmission mechanism 48 includes aneccentric cam 49 fixed to the up-downfeed shaft 43, acrank rod 50 whose one end portion is coupled to the up-downfeed shaft 43 via theeccentric cam 49, anoscillating arm 51 which is fixed to thehorizontal shaft 46, and a feeding amountvariable portion 52 which couples the other end portion of thecrank rod 50 and the oscillation end portion of theoscillating arm 51, and is capable of adjusting a width of a reciprocation-turning angle transmitted to thehorizontal feed shaft 46. - The
crank rod 50 is disposed such that the longitudinal direction thereof is substantially along the X-axis direction, and its base end portion rotatably fits into theeccentric cam 49, and its tip end portion is coupled to the feeding amountvariable portion 52. When the up-downfeed shaft 43 is fully rotated, the tip end portion of thecrank rod 50 performs a reciprocating motion along the longitudinal direction at a stroke twice as much as an eccentric amount thereof by theeccentric cam 49. This reciprocating motion of thecrank rod 50 is transmitted as reciprocation-turning drive force to thehorizontal feed shaft 46 via the feeding amountvariable portion 52 and theoscillating arm 51. - With respect to the feeding amount
variable portion 52, as shown inFig. 4 , a substantially U-shapedfeed adjusting body 55 is supported rotatably with respect to the sewing machine frame by apivot 56 parallel to thehorizontal shaft 46, and one ends of a pair ofsecond link bodies pivots feed adjusting body 55. - The other ends of the pair of
second link bodies pivot 59 to which the tip end of thecrank rod 50 is coupled rotatably. Moreover, the lower ends of a pair offirst link bodies 53 are supported rotatably by thepivot 59, and the upper ends of the pair offirst link bodies 53 are coupled rotatably to the tip end of theoscillating arm 51. Thepivots horizontal feed shaft 46. - Accordingly, the feeding amount
variable portion 52 includes the pair offirst link bodies 53 which are coupled to the tip end portion of thecrank rod 50 and the tip end portion of theoscillating arm 51, the pair ofsecond link bodies 54 which guides a reciprocating motion direction of the other end portion of thecrank rod 50 to any direction, and thefeed adjusting body 55 which adjusts a guiding direction by thesecond link bodies 54. - In the feeding amount
variable portion 52, when thefeed adjusting body 55 is rotated to an angular position (a neutral position) at which thefirst link bodies 53 and thesecond link bodies 54 are overlapped in parallel, the drive force of thecrank rod 50 is not transmitted to theoscillating arm 51, so as not to transmit the reciprocation-turning motion to thehorizontal feed shaft 46, thereby making a stitch pitch 0. - When the
feed adjusting body 55 is turned in one direction from the neutral angle, a reciprocating oscillating motion is given to theoscillating arm 51 side according to its turning angle amount, thereby it is possible to widen a stitch pitch in the forward feed direction. - When the
feed adjusting body 55 is turned in the opposite direction from the neutral angle, a reciprocating oscillating motion is given to theoscillating arm 51 side according to its turning angle amount, and because the phase is reversely transmitted in this case, it is possible to widen a stitch pitch in a backward feed direction. - The
horizontal feed shaft 46 is disposed further on the downstream side (on the left side inFigs. 2 and3 ) in the cloth feed direction than theshuttle shaft 32. The feeding amountvariable portion 52 is coupled to one end portion in the direction of axis on the vertical drum portion 22 side of thehorizontal feed shaft 46, and reciprocation-turning drive force is given to the one end portion from the up-downfeed shaft 43 via the feeding amountvariable portion 52. The other end portion in the direction of axis of thehorizontal feed shaft 46 is coupled to thehorizontal feed arm 47, to transmit reciprocating drive force along the X-axis direction to thefeed base 42 via thehorizontal feed arm 47. - The lower end portion (base end portion) of the
horizontal feed arm 47 is fixedly coupled to the one end portion in the direction of axis of thehorizontal feed shaft 46, and the upper end portion (oscillation end portion) of thehorizontal feed arm 47 is coupled to thefeed base 42. - The
feed base 42 is installed under the throat plate, and its end portion on the front side in the cloth feed direction (X-axis direction) is coupled to the up-downfeed shaft 43 via thecrank rod 45, and the end portion on the rear side in the cloth feed direction is coupled to thehorizontal feed shaft 46 via thehorizontal feed arm 47. - Further, the
feed base 42 is attached so as to slightly bend (off-set) the end portion on the up-downfeed shaft 43 side toward the vertical drum portion 22 side. - A cloth
feed adjusting mechanism 70 will be described based onFigs. 5 to 7B . In these drawings, the detailed configuration of the feeding amountvariable portion 52 is omitted. - The cloth
feed adjusting mechanism 70 is capable of freely switching between setup stitch pitches of two different widths by matching thefeed adjusting body 55 to two target turning angles, and is further capable of switching between the forward feed direction and the backward feed direction at the setup stitch pitches of the two different widths. - The cloth
feed adjusting mechanism 70 includes aninput arm 71 which is fixedly mounted to thefeed adjusting body 55 via thepivot 56, anadjustment shaft 72 which is supported rotatably so as to be along the X-axis direction in thebed portion 21, first and secondfeed adjusting arms adjustment shaft 72, alink body 75 which couples the firstfeed adjusting arm 73 and the turning end portion of theinput arm 71, first and secondadjustment screw members 76, 77 (examples as first and second adjusting members) which configure the setting of stitch pitches by manual dialing operations, first andsecond cam members bed portion 21, a pitch switching cylinder 80 (an example of a pitch switching actuator) that switches between the stitch pitches respectively set by the first and secondadjustment screw members bodies 82 to 84 and a switchingarm 85 which transmit an output of thedirection switching cylinder 81 to theadjustment shaft 72. - The
adjustment shaft 72, the first and second adjustingarms arm 85 are fixedly coupled to one another, so as to function as aturning unit 86 which integrally performs a turning motion around the X-axis in thebed portion 21. - The
input arm 71 radially extends centering around thepivot 56 along the X-axis direction. On the other hand, the firstfeed adjusting arm 73 as well radially extends centering around theadjustment shaft 72 along the X-axis direction, and these turning end portions of theinput arm 71 and the firstfeed adjusting arm 73 are coupled to one another by thelink body 75, thereby configuring a four-node link mechanism. That is, when turning is generated on theadjustment shaft 72 side, it is possible to interlock thefeed adjusting body 55 to turn via thepivot 56. - Turning power in an anticlockwise direction in
Figs. 6A and 6B centering around thepivot 56 is always given to thefeed adjusting body 55 by atension spring 58. - The first and second
feed adjusting arms cam portions second cam members adjustment shaft 72 of the first or secondfeed adjusting arms - The first and second
adjustment screw members dial portions shaft portions dial portions sewing machine frame 20, and theshaft portions sewing machine frame 20. - With respect to the first and second
adjustment screw members respective dial portions shaft portions second cam members - In addition, these setup widths of the stitch pitches input from the first and second
adjustment screw members adjustment screw members - The first and
second cam members shaft portions sewing machine frame 20. - The
first cam member 78 includes a turning shaft 782 (an example of a first pivot) extending along the X-axis direction at its lower end portion, and aflat contact surface 783, with which theshaft portion 762 contact in a pressed manner, is formed at a region facing theshaft portion 762. - Moreover, the
first cam member 78 is disposed adjacent to the firstfeed adjusting arm 73 in the X-axis direction, and thecam portion 781 formed at the upper portion of thecam member 78 engages thecontact pin 731 of the firstfeed adjusting arm 73. - The
cam portion 781 is, as shown inFigs. 6A and 6B , a substantially V-shaped notch opening toward the firstfeed adjusting arm 73 side, and the respective members are assembled such that thefeed adjusting body 55 is at the neutral angle with a stitch pitch of 0 in a state in which thecontact pin 731 is in contact with the V-shaped bottom portion (innermost portion). That is, the V-shaped bottom portion in thecam portion 781 is anintermediate position 784 at which a stitch pitch is set to 0. - In the
cam portion 781, sloping portions facing each other with theintermediate position 784 interposed therebetween are formed, and one of those (the upper portion inFigs. 6A and 6B ) is a forwardfeed adjusting portion 785 capable of adjusting the stitch pitch in the forward feed direction by contacting thecontact pin 731 thereto. Further, the other sloping portion (the lower portion inFigs. 6A and 6B ) of thecam portion 781 is a backwardfeed adjusting portion 786 capable of adjusting the stitch pitch in the backward feed direction by contacting thecontact pin 731 thereto. - A contacting position of the
contact pin 731 with respect to thecam portion 781 is determined according to a turning angle around the turningshaft 782 of thefirst cam member 78, and the turning angle of thefirst cam member 78 can be set by a rotation operation of the firstadjustment screw member 76. - The
feed adjusting body 55 receives torque in the anticlockwise direction inFigs. 6A and 6B centering around thepivot 56 by thetension spring 58, thereby transmitting torque in the same direction to the firstfeed adjusting arm 73. Accordingly, when thefirst cam member 78 moves backward from the position shown inFig. 6A to the position shown inFig. 6B , thecontact pin 731 moves along the forwardfeed adjusting portion 785. Accordingly, when the feed direction is switched to the backward feed direction, theadjustment shaft 72 is forcibly turned by thedirection switching cylinder 81, to bring thecontact pin 731 into contact with the backwardfeed adjusting portion 786. Thereby, turning thefeed adjusting body 55 up to the backward feeding side over the neutral angle, makes it possible to perform sewing in the backward feed direction. - In this
cam portion 781, as described above, by turning thecontact pin 731 around theadjustment shaft 72, thecontact pin 731 is switched from a state in which thecontact pin 731 is in contact with a predetermined position of the forwardfeed adjusting portion 785 to a state in which thecontact pin 731 is in contact with a predetermined position of the backwardfeed adjusting portion 786. The shape of thecam portion 781 is designed such that the stitch pitch in the forward feed direction in the state in which thecontact pin 731 is in contact with the predetermined position of the forwardfeed adjusting portion 785 and the stitch pitch in the backward feed direction in the state in which thecontact pin 731 is in contact with the predetermined position of the backwardfeed adjusting portion 785 are equal in their pitch widths. - The
second cam member 79 extends in a state in which its longitudinal direction is substantially along the Z-axis direction, and includes a turning shaft 792 (an example of a second pivot) along the X-axis direction at a substantially intermediate position in the longitudinal direction, and aflat contact surface 793, with which theshaft portion 772 contacts in a pressed manner, is formed slightly above the turningshaft 792 and at a region facing theshaft portion 772. - Moreover, the
second cam member 79 is disposed adjacent to the secondfeed adjusting arm 74 in the X-axis direction, and thecam portion 791 formed at the lower portion of thecam member 79 engages thecontact pin 741 of the secondfeed adjusting arm 74. - The
cam portion 791 has, as shown inFigs. 7A and 7B , anintermediate position 794, a forwardfeed adjusting portion 795, and a backwardfeed adjusting portion 796 in the same way as thecam portion 781 of thefirst cam member 78. Because these have the structures which are the same as those of thecam portion 781 of thefirst cam member 78, descriptions thereof will be omitted. - The upper end portion of the
second cam member 79 is coupled to a plunger of thepitch switching cylinder 80 via alink body 801. Normally, thepitch switching cylinder 80 is, as shown inFig. 7A , in a state in which the plunger is brought backward, thereby leading to a state in which thecontact surface 793 of thesecond cam member 79 is separated from the tip end portion of theshaft portion 772 of the secondadjustment screw member 77, so as to maintain a state in which thecam portion 791 as well is spaced from thecontact pin 741 of the secondfeed adjusting arm 74. That is, in this state, not the stitch pitch set by the secondadjustment screw member 77, but the stitch pitch set by the firstadjustment screw member 76 is selected. - In the case where the stitch pitch is switched to the stitch pitch set by the second
adjustment screw member 77, as shown inFig. 7B , the plunger of thepitch switching cylinder 80 moves forward, and thesecond cam member 79 turns in the clockwise direction centering around the turningshaft 792, to switch to a state in which thecam portion 791 is in contact with thecontact pin 741. When thecontact surface 793 of thesecond cam member 79 contacts the tip end portion of theshaft portion 772 of the secondadjustment screw member 77, thesecond cam member 79 stops turning, to switch to the stitch pitch set by the secondadjustment screw member 77. - At this time, the stitch pitch set by the second
adjustment screw member 77 needs to be set to a value lower than the stitch pitch set by the firstadjustment screw member 76. If the stitch pitch set by the secondadjustment screw member 77 is set to be a higher value, even when a motion of switching to thesecond cam member 79 is performed by thepitch switching cylinder 80, thecam portion 791 does not reach thecontact pin 741, which does not allow to switch to the stitch pitch set by the secondadjustment screw member 77. That is, the secondadjustment screw member 77 is for setting a small pitch. - As shown in
Figs. 5 and8A , one end portion of thelink body 82 is coupled to the plunger of thedirection switching cylinder 81, and the other end portion of thelink body 82 is coupled to one arm portion of a bell crankmember 83 supported turnably by thebed portion 21. Moreover, the other arm portion of the bell crankmember 83 is coupled to one end portion of thelink body 84, and the other end portion of thelink body 84 is coupled to a turning step portion of the switchingarm 85 fixedly mounted to the end portion of theadjustment shaft 72. With this configuration, when the plunger of thedirection switching cylinder 81 performs a backward motion, turning force in a clockwise direction inFigs. 6A to 8B is given to theadjustment shaft 72 via thelink members member 83, and the switchingarm 85. Thereby, the respective contact pins 731, 741 move from the forwardfeed adjusting portions feed adjusting portions respective cam portions adjustment screw member - A marking 821 is marked along the way of the above-described
link body 82. This is marked for detecting a motion of the slight operation amount because it is necessary for thedirection switching cylinder 81 to carry out driving in a slight operation amount to an extent that the sewing direction is not switched in pitch switching control which will be described later. - That is, an optical position detecting sensor 87 (an example of detecting means) that detects the marking 821 is installed together to the
link body 82, and when the plunger of thedirection switching cylinder 81 moves backward by a slight operation amount set in advance, the marking 821 enters the range of detection by theposition detecting sensor 87, to output a detection signal. Thereby, when a motion in the slight operation amount is detected, control for stopping thedirection switching cylinder 81 so as not to cause a further motion is performed. - A control system of the
sewing machine 10 will be described with reference toFig. 9 . - The
sewing machine 10 includes acontrol unit 90 which performs motion controls in the respective configurations. Asolenoid valve 802 that controls the motion of thepitch switching cylinder 80, and asolenoid valve 811 that controls the motion of thedirection switching cylinder 81 are connected to thecontrol unit 90 viarespective drive circuits position detecting sensor 87 installed together to thedirection switching cylinder 81 as well is connected to thecontrol unit 90. - Further, a
pitch selecting switch 95 that switches the stitch pitch set by the firstadjustment screw member 76 to the stitch pitch set by the secondadjustment screw member 77, and adirection selecting switch 96 that switches between the forward and backward sewing directions are connected to thecontrol unit 90 via aninterface 97. - Further, the
sewing machine motor 16 and anencoder 17 that detects the number of rotations of thesewing machine motor 16 are connected to thecontrol unit 90 via amotor drive circuit 161. - The
control unit 90 includes aCPU 91, aROM 92, aRAM 93, and anEEPROM 94, and controls thesewing machine motor 16 to keep a target speed while monitoring an output from theencoder 17. - The cloth feed adjusting device of the present embodiment includes the cloth
feed adjusting mechanism 70 and the control system shown inFig. 9 . - Pitch switching control that the
control unit 90 performs with respect to the clothfeed adjusting mechanism 70 will be described in a timing chart shown inFig. 10 . - First, on the premise of the motion, as shown in
Fig. 6B , sewing is being performed at the stitch pitch set by the firstadjustment screw member 76 in a state in which thecontact pin 731 is in contact with thecam portion 781 of thefirst cam member 78. At this time, thepitch switching cylinder 80 is in a state in which the plunger moved backward, and as shown inFig. 7A , thesecond cam member 79 is spaced from the secondadjustment screw member 77. Moreover, thedirection switching cylinder 81 is, as shown inFig. 8A , in a state in which the plunger is moved forward, and thecontact pin 731 is in contact with the forwardfeed adjusting portion 785 in thecam portion 781 of thefirst cam member 78 which is currently selected. - When the
pitch selecting switch 95 is pressed (ON inFig. 10A ), thecontrol unit 90 controls thesolenoid valve 811 to move the plunger of thedirection switching cylinder 81 backward (ON inFig. 10B ). Further, at the same time, thecontrol unit 90 controls thesolenoid valve 802 to move the plunger of thepitch switching cylinder 80 forward (ON inFig. 10C ). - By this motion of the
direction switching cylinder 81, theadjustment shaft 72 is caused to turn in a clockwise direction inFigs. 7A and 7B , thecontact pin 741 moves in the direction so as to separate away from the forwardfeed adjusting portion 795 of thecam portion 791. Simultaneously, as shown inFig. 7B , thepitch switching cylinder 80 pushes the upper end portion of thesecond cam member 79, to move thecam portion 791 toward thecontact pin 741 side. At this time, because thecontact pin 731 moves in the direction so as to separate away from the forwardfeed adjusting portion 785, and thecontact pin 741 moves in the direction so as to separate away from the forwardfeed adjusting portion 795, sliding motions between these contact pins and the cam portions are avoided or reduced. Accordingly, thepitch switching cylinder 80 is capable of smoothly performing the switching motion with a small output. - On the other hand, when the plunger of the
direction switching cylinder 81 moves backward to an extent, the marking 821 is detected by the position detecting sensor 87 (Fig. 8B and ON inFig. 10D ), and thecontrol unit 90 stops the actuation of thedirection switching cylinder 81 simultaneously with this detection by the sensor (OFF inFig. 10B ), and the plunger is returned into the forward-movement state. - Thereby, the
contact pin 741 is returned before thecontact pin 741 reaches the backwardfeed adjusting portion 796 of thecam portion 791, and thecontact pin 741 contacts the forwardfeed adjusting portion 795, to set to the stitch pitch set by the secondadjustment screw member 77. - In addition, when the
pitch selecting switch 95 is pressed again (OFF inFig. 10A ), the plunger of thepitch switching cylinder 80 moves backward (OFF inFig. 10C ), and thecam portion 791 of thesecond cam member 79 is separated from thecontact pin 741, and thecam portion 781 of thefirst cam member 78 again contacts thecontact pin 731, to return to the stitch pitch set by the firstadjustment screw member 76. - In the
sewing machine 10, in the pitch switching control, at the time of switching to the stitch pitch set by the secondadjustment screw member 77 from the state in which the stitch pitch set by the firstadjustment screw member 76 is selected, thedirection switching cylinder 81 is, simultaneously with thepitch switching cylinder 80, driven within the range in which the sewing direction is not switched. - In this manner, because the respective contact pins 731, 741 produce movement from the forward
feed adjusting portions feed adjusting portions pitch switching cylinder 80 performs the switching motion to thesecond cam member 79 at that time, and therefore, sliding contact between thecontact pin 731 and thecam portion 781 of thefirst cam member 85, and sliding contact between thecontact pin 741 and thecam portion 791 of thesecond cam member 79 are avoided or reduced. Accordingly, sliding friction is reduced, and the load on thepitch switching cylinder 80 is reduced, which makes it possible to use a downsized cylinder with a small output. - Further, it becomes possible to more rapidly perform a switching motion by a reduction in sliding friction.
- Moreover, due to a reduction in sliding friction, it becomes possible to reduce wear of the members, which makes it possible to achieve an improvement in durability and maintenance efficiency.
- Further, in the
sewing machine 10, the actuation of thedirection switching cylinder 81 in the pitch switching control is preferably performed within the range in which thecontact pin 741 does not reach the backwardfeed adjusting portion 796. In order to satisfy this condition, theposition detecting sensor 87 that detects that thedirection switching cylinder 81 performs a motion to a certain range is provided, to perform the control for stopping thedirection switching cylinder 81 upon detection by theposition detecting sensor 87. - In this manner, it becomes possible to cause the
direction switching cylinder 81 to perform a motion in an appropriate operation amount, which makes it possible avoid the situation in which thecontact pin 741 contacts the backwardfeed adjusting portion 796, to cause sliding friction, or the like, a more secure motion is performed, that makes it possible to achieve an improvement in reliability of the mechanism. - In the
sewing machine 10, in order to perform a slight motion of thedirection switching cylinder 81 in the pitch switching control, when an actual operation amount reaches a target value by theposition detecting sensor 87, the control for stopping thedirection switching cylinder 81 is performed. However, the condition for stopping thedirection switching cylinder 81 is not limited to an operation amount, and may be set according to an operation time, for example. - For example, in the case where a required operation time until the
contact pin 741 reaches the backwardfeed adjusting portion 796 from the forwardfeed adjusting portion 795 by thedirection switching cylinder 81 is known in advance, a time shorter than the required operation time may be determined as an actuation time of thedirection switching cylinder 81, to perform the control for stopping thedirection switching cylinder 81 at a point in time of passage of the actuation time. - For example, in the case where the above-described required operation time is 10 [ms], when a time shorter than the required operation time of 10 [ms], for example, 5 [ms] is measured from the start of driving of the
direction switching cylinder 81 by a built-in clock (an example of clocking means) of theCPU 91 of thecontrol unit 90, the control for stopping the actuation of thedirection switching cylinder 81 is performed. - Thereby, in the pitch switching control, it is possible to actuate the
direction switching cylinder 81 in a slight operation amount, which makes it possible to obtain the effect which is the same as in the case where theposition detecting sensor 87 is used. - As a second embodiment, another example of a cloth feed adjusting mechanism will be described based on
Figs. 11 and13 . In these drawings, illustration of thefeed adjusting body 55 is omitted, and only thepivot 56 thereof is illustrated. Further, thefeed adjusting body 55 and thefeeding device 40 have the mechanisms which are the same as those in the first embodiment. - The aforementioned cloth
feed adjusting mechanism 70 includes the twofeed adjusting arms cam members feed adjusting mechanism 70A is different from the clothfeed adjusting mechanism 70 in the point that a single feed adjusting arm and a single cam member are used. - The cloth
feed adjusting mechanism 70A includes aninput arm 71A which is fixedly mounted to thefeed adjusting body 55 via thepivot 56, anadjustment shaft 72A which is supported rotatably so as to be along the X-axis direction in thebed portion 21, afeed adjusting arm 73A which is fixedly mounted to theadjustment shaft 72A, alink body 75A which couples thefeed adjusting arm 73A and the turning end portion of theinput arm 71A, first and secondadjustment screw members cam member 78A which is supported turnably around the X-axis in thebed portion 21, apitch switching cylinder 80A (an example of a pitch switching actuator) that switches between stitch pitches respectively set by the first and secondadjustment screw members direction switching cylinder 81A (an example of a feed direction switching actuator) that switches between the forward and backward sewing directions, and aswitching arm 85A which transmits an output of thedirection switching cylinder 81A to theadjustment shaft 72A. - The
adjustment shaft 72A, thefeed adjusting arms 73A, and theswitching arm 85A are fixedly coupled to one another, and function as aturning unit 86A which integrally perform a turning motion around the X-axis in thebed portion 21. - The
input arm 71A radially extends centering around thepivot 56 along the X-axis direction. Theinput arm 71A is capable of being interlocked with thefeed adjusting arm 73A capable of turning around the X-axis by thelink body 75A. - The
feed adjusting arm 73 includes a boss-shapedcontact pin 731A (an example of a contact portion) which projects along the X-axis direction on the side surface portion thereof, and is configured to contact acam portion 781A of thecam member 78A, to fix a turning angle around theadjustment shaft 72A of thefeed adjusting arm 73A. - The first and second
adjustment screw members adjustment screw members adjustment screw members shaft portions dial portions - In the case of the first and second
adjustment screw members adjustment screw member 76A, it is possible to switch the stitch pitch to the stitch pitch set by the secondadjustment screw member 77A by an actuation of thepitch switching cylinder 80A. - Further, in the point that sewing is performed at the same setup stitch pitch in the cases of forward feeding and backward feeding, and it is necessary to make the stitch pitch set by the second
adjustment screw member 77A smaller than the stitch pitch set by the firstadjustment screw member 76A, the first and secondadjustment screw members adjustment screw members - However, the first and second
adjustment screw members adjustment screw member 76A is on the upper side, on the side surface of the sewing machine frame. - The
cam member 78A is installed on the front side of theshaft portions sewing machine frame 20. - In the
cam member 78A, first and second contact surfaces 787A, 788A with which theshaft portions shaft 782A (an example of a pivot) along the X-axis direction is included between the contact surfaces 787A, 788A. Further, atorsion coil spring 789A which pushes thefirst contact surface 787A of thecam member 78A in a direction in whichfirst contact surface 787A firmly presses the firstadjustment screw member 76A is attached to the turningshaft 782A. - Moreover, the
cam member 78A is disposed adjacent to thefeed adjusting arm 73A in the X-axis direction, and thecam portion 781A formed in the vicinity of the end portion on the opposite side of therespective contact surfaces cam member 78A engages thecontact pin 731A of thefeed adjusting arm 73A. - As shown in
Fig. 13 , thecam portion 781A of thecam member 78A is formed so as to be perforated into a substantially triangle with respect to thecam member 78A forming a plate shape. In thiscam portion 781A, a region corresponding to one side of the triangle is a forwardfeed adjusting portion 785A, a region corresponding to one side which faces adjacent to the forwardfeed adjusting portion 785A is a backwardfeed adjusting portion 786A, and a region corresponding to the vertex between the adjustingportions intermediate position 784A. - This cloth
feed adjusting mechanism 70A has the feature that, as mentioned above, thecam member 78A and thefeed adjusting arm 73A are each composed of one member, to achieve switching of setup stitch pitches by the twoadjustment screw members - The principle of actuation will be described. First, when a desired stitch pitch is set and adjusted by the first
adjustment screw member 76A, and a desired stitch pitch is set and adjusted by the secondadjustment screw member 77A so as to be smaller than that of the firstadjustment screw member 76A, thecam member 78A firmly presses the firstadjustment screw member 76A with itscontact surface 787A by thetorsion coil spring 789A, to form a gap between thecontact surface 788A and the secondadjustment screw member 77A. - The
contact pin 731A shown by the solid line inFig. 13 indicates a contacting position with respect to the forwardfeed adjusting portion 785A at that time. - At the time of switching the pitch, the
pitch switching cylinder 80A is actuated, and the plunger pushes the top surface in the vicinity of the rear end portion of thecam member 78A downward. Thereby, turning thecam member 78A in the anticlockwise direction in the drawing centering around the turningshaft 782A, to switch to a state in which thecontact surface 788A firmly presses the secondadjustment screw member 77A. When thecam member 78A turns in the anticlockwise direction, thecontact pin 731A moves toward theintermediate position 784A while sliding over the forwardfeed adjusting portion 785A (thecontact pin 731A by the alternate long and two short dashed line), and therefore, thefeed adjusting arm 73A (not shown inFig. 13 ) engaging thecontact pin 731A turns in the clockwise direction inFig. 13 . Thereby, turning thefeed adjusting body 55 along with thefeed adjusting arm 73A, to switch to the stitch pitch set by the secondadjustment screw member 77A. - Further, the
direction switching cylinder 81A gives turning in the arrow direction (the clockwise direction) inFig. 12 to theswitching arm 85A at the time of switching from forward feeding to backward feeding. Thereby, turning thefeed adjusting arm 73A along with the switchingarm 85A in a clockwise direction, to move thecontact pin 731A to a position of 731R inFig. 13 . Thereby, bringing thecontact pin 731A into contact with the backwardfeed adjusting portion 786A, to be able to turn thefeed adjusting body 55 so as to perform backward feeding at the setup stitch pitch. - The pitch switching control in the cloth
feed adjusting mechanism 70A with such a configuration will be described. In the case of the clothfeed adjusting mechanism 70A as well, a marking is attached to a forward and backward motion region in the same way as thedirection switching cylinder 81 mentioned above, and a slight motion to an extent that forward feeding is not switched to backward feeding is detected by a position detecting sensor. - Then, with respect to the
pitch switching cylinder 80A and the direction switching cylinder, the motion control which is the same as that shown by the timing chart ofFig. 10 with respect to thepitch switching cylinder 80 and thedirection switching cylinder 81 mentioned above is performed. - That is, at the time of switching the pitch, the
pitch switching cylinder 80A and the direction switching cylinder simultaneously start actuations. Thus, thecontact pin 731 A is spaced from the forwardfeed adjusting portion 785A of thecam portion 781A by the direction switching cylinder, and simultaneously, thecam member 78A is turned by thepitch switching cylinder 80A. Therefore, thecontact pin 731A moves to the setting position by the secondadjustment screw member 77A without sliding over the forwardfeed adjusting portion 785A. - Further, with respect to the direction switching cylinder, because the plunger is returned to the original position when a slight motion is detected by the position detecting sensor, it is possible to move the
contact pin 731A to a planned position. - That is, with respect to this cloth
feed adjusting mechanism 70A as well, in the same way in the case of the clothfeed adjusting mechanism 70, it is possible to achieve downsizing, and achieve an improvement in motion rapidity and a reduction in sliding friction of the respective members with respect to thepitch switching cylinder 80A. - As a third embodiment, another example of the
transmission mechanism 48 which converts rotary drive force of the up-downfeed shaft 43 into reciprocation-turning drive force, to transmit the force to thehorizontal feed shaft 46 will be described. That is, the aforementioned clothfeed adjusting mechanisms transmission mechanism 48, but also to atransmission mechanism 48B shown hereinafter. In the description of thetransmission mechanism 48B, the same reference numerals are given for the same configuration of thesewing machine 10 mentioned above, and overlapping descriptions will be omitted. - The
transmission mechanism 48B includes aneccentric cam 49B fixedly mounted to the up-downfeed shaft 43, acrank rod 50B whose one end portion is coupled to the up-downfeed shaft 43 via theeccentric cam 49B, anoscillating arm 51B which is fixedly mounted to thehorizontal shaft 46, to oscillate centering around thehorizontal shaft 46, and a feeding amountvariable portion 52B which couples the other end portion of thecrank rod 50B and the oscillation end portion of theoscillating arm 51B, and is capable of adjusting a width of a reciprocation-turning angle transmitted to thehorizontal feed shaft 46. - The feeding amount
variable portion 52B includes alink body 53B whose one end portion in the longitudinal direction is coupled to the oscillation end portion of theoscillating arm 51B, and whose intermediate portion is coupled to the other end portion of thecrank rod 50B, a pair ofsquare pieces 54B which are held by the other end portion of thelink body 53B, afeed adjusting body 55B having aguide groove 551B that guides thesquare pieces 54B, and apivot 56B which allows thefeed adjusting body 55B to be turnable around the Y-axis. - The
link body 53B is coupled turnably around the Y-axis to theoscillating arm 51B, thesquare pieces 54B, and thecrank rod 50B respectively with the both end portions and the intermediate portion. - Because the other end portion of the
crank rod 50B is coupled to the intermediate portion of thelink body 53B, when the up-downfeed shaft 43 rotates, a reciprocating motion containing a vertical direction component is given to thelink body 53B. Thesquare pieces 54B are attached to the other end portion of thelink body 53B, and thesquare pieces 54B are structured so as to regulate its moving direction by theguide groove 551B formed in thefeed adjusting body 55B. - In this case, for example, as shown in
Fig. 15 , when theguide groove 551B is directed in the vertical direction, the reciprocating motion input from thecrank rod 50B to thelink body 53B is substantially in the vertical direction, and thelink body 53B performs a reciprocation-turning motion with a coupling portion with theoscillating arm 51B serving as a fulcrum. Therefore, the turning end portion side of theoscillating arm 51B is a substantially resting state, and no turning motion is transmitted to thehorizontal feed shaft 46. That is, this direction is a neutral angle in thefeed adjusting body 55B. - When the
feed adjusting body 55B is turned in any direction from the neutral angle, theguide groove 551B is inclined in an oblique direction, and therefore, a reciprocating motion component in a right and left direction (in the X-axis direction) is generated in thelink body 53B, and this is transmitted to the turning end portion of theoscillating arm 51B as well, thereby transmitting the turning motion to thehorizontal feed shaft 46 as well. A stroke of the reciprocation-turning transmitted to thehorizontal feed shaft 46 varies according to an angular variation amount of thefeed adjusting body 55B from the neutral angle. - Further, depending on whether the
feed adjusting body 55B is turned in the clockwise direction or the anticlockwise direction from the neutral angle, the phase of the reciprocating motion transmitted to thehorizontal feed shaft 46 is inverted. Accordingly, it is possible to optionally adjust stitch pitches in the forward direction and the backward direction according to turning angles in the respective directions. - The aforementioned cloth
feed adjusting mechanisms transmission mechanism 48 by mounting theinput arms pivot 56B in thetransmission mechanism 48B. - While the first and second adjustment screw members have been described as examples of the first and second adjusting members in the embodiment described above, one or both of the first and second adjusting members may not necessarily have a screw structure in so far as they move forward or backward when operated. Further, while the pitch switching cylinder and the direction switching cylinder have been described as examples of the pitch switching actuator and the feed direction switching actuator in the embodiment described above, one or both of the pitch switching actuator and the feed direction switching actuator may be actuators other than the cylinders.
Claims (4)
- A cloth feed adjusting device of a sewing machine comprising:at least one cam member (78, 79, 78A) supported by a machine frame (20) in a rotatable manner by a pivot (782, 792, 782A);a first adjusting member (76, 76A) configured to move forward or backward when operated, and to push the at least one cam member (78, 79, 78A) to regulate a rotational position of the at least one cam member (78, 79, 78A);a second adjusting member (77, 77A) configured to move forward or backward when operated;a pitch switching actuator (80, 80A) coupled to the at least one cam member (78, 79, 78A), and configured to cause the at least one cam member (78, 79, 78A) to contact or separate from the second adjusting member (77, 77A); anda control unit (90) configured to drive the pitch switching actuator (80, 80A),wherein the at least one cam member (78, 79, 78A) comprises a cam portion (781, 791, 781A) which is formed such that a forward feed adjusting portion (785, 795, 785A) capable of adjusting a stitch pitch in a forward feeding and a backward feed adjusting portion (786, 796, 786A) capable of adjusting a stitch pitch in a backward feeding face each other and have a border at an intermediate position (784, 794, 784A) at which a stitch pitch becomes 0,characterized in that the cloth feed adjusting device further comprises:a turning unit (86, 86A) comprising a contact portion (731, 741, 731A) capable of contacting the cam portion (781, 791, 781A), and supported so as to be rotatable about one axis (72, 72A) with respect to the machine frame (20) to change, in accordance with a rotation angle thereof, the stitch pitch in a range from the forward feeding to the backward feeding; anda feed direction switching actuator (81, 81A) configured to rotate the turning unit (86, 86A) such that the contact portion (731, 741, 731A) moves between the forward feed adjusting portion (785, 795, 785A) and the backward feed adjusting portion (786, 796, 786A) of the cam portion (781, 791, 781A), thereby switching a stitch direction from one of a forward feed direction and a backward feed direction to the other,wherein, at the time of starting the operation of the pitch switching actuator (80,80A), the control unit (90) drives the feed direction switching actuator (81, 81A) in a range in which the stitch direction is not switched.
- The cloth feed adjusting device of the sewing machine according to claim 1, wherein the at least one cam member (78, 79, 78A) comprises:a first cam member (78) supported by the machine frame (20) in a rotatable manner by a first pivot (782), anda second cam member (79) supported by the machine frame (20) in a rotatable manner by a second pivot (792) and capable of contacting and separating from the second adjusting member, wherein a rotational position thereof is regulated by being pushed when contacting the second adjusting member,the first adjusting member (76) pushes the first cam member (78) to regulate the rotational position of the first cam member (78),when the second adjusting member (77) contacts the second cam member (79), the second adjusting member (77) pushes the second cam member (79) to regulate the rotational position of the second cam member (79),the pitch switching actuator is coupled to the second cam member (79), and causes the second cam member (79) to contact or separate from the second adjusting member (77),the first cam member (78) comprises a first cam portion (781) which is formed such that a forward feed adjusting portion (785) capable of setting a stitch pitch in the forward feed direction and a backward feed adjusting portion (786) capable of setting a stitch pitch in the backward feed direction face each other and have an intermediate position (784) as a border at which the stitch pitch becomes 0,the second cam member (79) comprises a second cam portion (791) which is formed such that a forward feed adjusting portion (795) capable of setting the stitch pitch in the forward feed direction and a backward feed adjusting portion (796) capable of setting the stitch pitch in the backward feed direction face each other and have a border at an intermediate position (794) at which a stitch pitch becomes 0,the contact portion (731, 741) is capable of contacting one of the first cam portion (781) and the second cam portion (791), andthe feed direction switching actuator (81) rotates the turning unit (86) such that the contact portion (731, 741) moves between the forward feed adjusting portion (785, 795) and the backward feed adjusting portion (786, 796) of one of the first and second cam portions (781, 791), thereby switching the stitch direction from one of the forward feed direction and the backward feed direction to the other.
- The cloth feed adjusting device of the sewing machine according to claim 1 or 2, further comprising detecting means (87) for detecting a predetermined operation amount of the feed direction switching actuator (81,81A),
wherein the control unit (90) performs the operation of the feed direction switching actuator (81, 81A) at the time of starting the operation of the pitch switching actuator (80, 80A) until the detecting means (87) detects the predetermined operation amount. - The cloth feed adjusting device of the sewing machine according to claim 1 or 2, further comprising clocking means (91) for measuring an operation time of the feed direction switching actuator (81, 81A),
wherein the control unit (90) performs the operation of the feed direction switching actuator (81, 81A) at the time of starting the operation of the pitch switching actuator (80), 80A) until the clocking means (91) measures a predetermined operation time.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012007756A JP5940307B2 (en) | 2012-01-18 | 2012-01-18 | Sewing machine feed adjustment mechanism |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2617884A1 EP2617884A1 (en) | 2013-07-24 |
EP2617884B1 true EP2617884B1 (en) | 2014-08-13 |
Family
ID=47912882
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13151760.9A Active EP2617884B1 (en) | 2012-01-18 | 2013-01-18 | Cloth feed adjusting device of sewing machine |
Country Status (4)
Country | Link |
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EP (1) | EP2617884B1 (en) |
JP (1) | JP5940307B2 (en) |
KR (1) | KR101912354B1 (en) |
TW (1) | TW201341620A (en) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015207996B3 (en) * | 2015-04-30 | 2016-10-27 | Dürkopp Adler AG | sewing machine |
DE102015207998B3 (en) * | 2015-04-30 | 2016-08-04 | Dürkopp Adler AG | Stitch length adjusting device for a sewing machine and sewing machine with such a stitch length adjusting device |
JP2017184980A (en) | 2016-04-05 | 2017-10-12 | Juki株式会社 | sewing machine |
JP6761659B2 (en) | 2016-04-05 | 2020-09-30 | Juki株式会社 | sewing machine |
CN106012337B (en) * | 2016-08-03 | 2019-01-11 | 杰克缝纫机股份有限公司 | Needle gage and differential regulating mechanism and sewing machine |
CN111379092B (en) * | 2018-12-30 | 2024-07-23 | 浙江中捷缝纫科技有限公司 | Sewing machine |
CN110130003B (en) * | 2019-06-27 | 2024-07-02 | 廊坊市东平汽车零配件有限公司 | Sewing machine and use method thereof |
TWI796518B (en) * | 2019-09-20 | 2023-03-21 | 億勤有限公司 | Feeding mechanism of sewing machine |
CN112127059A (en) * | 2020-09-28 | 2020-12-25 | 琦星智能科技股份有限公司 | Intelligent multifunctional sewing machine |
CN111979653A (en) * | 2020-09-30 | 2020-11-24 | 琦星智能科技股份有限公司 | Driving device for lifting presser foot and adjusting needle distance in sewing machine |
CN112779685A (en) * | 2021-01-30 | 2021-05-11 | 琦星智能科技股份有限公司 | Sewing machine has combination wheel of adjusting gauge needle |
CN112899897B (en) * | 2021-01-30 | 2024-09-20 | 琦星智能科技股份有限公司 | Sewing machine capable of executing thread cutting under zero-needle-distance position state |
CN112779690A (en) * | 2021-01-30 | 2021-05-11 | 琦星智能科技股份有限公司 | Sewing machine with positioning zero function |
TWI782686B (en) * | 2021-09-01 | 2022-11-01 | 伸興工業股份有限公司 | Feed gear drive for sewing machines |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH290562A (en) * | 1951-04-25 | 1953-05-15 | Orelli Franz Von | Reversible fabric feed device on a sewing machine. |
DE3819061C1 (en) * | 1988-06-04 | 1989-11-23 | Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern, De | |
JP2881784B2 (en) * | 1988-11-29 | 1999-04-12 | アイシン精機株式会社 | Sewing machine feed amount control device |
JPH04108488A (en) * | 1990-08-28 | 1992-04-09 | Juki Corp | Fabric feeding stopping device in beginning of sewing for sewing machine |
JPH06292778A (en) * | 1993-04-08 | 1994-10-21 | Brother Ind Ltd | Sewing machine |
JP4624169B2 (en) * | 2004-09-22 | 2011-02-02 | Juki株式会社 | Sewing machine feeder |
JP4823700B2 (en) * | 2006-01-31 | 2011-11-24 | Juki株式会社 | sewing machine |
JP2010246839A (en) * | 2009-04-20 | 2010-11-04 | Juki Corp | Sewing machine |
JP2011101719A (en) * | 2009-11-11 | 2011-05-26 | Juki Corp | Feeding amount adjusting mechanism of sewing machine |
-
2012
- 2012-01-18 JP JP2012007756A patent/JP5940307B2/en active Active
-
2013
- 2013-01-17 KR KR1020130005293A patent/KR101912354B1/en active IP Right Grant
- 2013-01-17 TW TW102101800A patent/TW201341620A/en unknown
- 2013-01-18 EP EP13151760.9A patent/EP2617884B1/en active Active
Also Published As
Publication number | Publication date |
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KR101912354B1 (en) | 2018-10-26 |
CN103215756A (en) | 2013-07-24 |
TW201341620A (en) | 2013-10-16 |
TWI563139B (en) | 2016-12-21 |
JP5940307B2 (en) | 2016-06-29 |
KR20130085003A (en) | 2013-07-26 |
EP2617884A1 (en) | 2013-07-24 |
JP2013146326A (en) | 2013-08-01 |
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