JPH0112708Y2 - - Google Patents

Description

[Detailed description of the invention] Technical field This invention provides only four-movement feed consisting of vertical feed and horizontal feed to the feed table on which the feed dog is mounted, to form a normal pattern, and to This invention relates to a sewing machine capable of horizontal feed, which is configured to be able to form a cross feed pattern by providing cross feed in a direction perpendicular to the direction of the cross feed and at least vertical feed among the four movement movements, and particularly relates to its cloth feed device. It is.

Prior Art In conventional sewing machines of this type, mechanisms for providing horizontal feed and cross-feed to the feed table are separately provided in the bed of the sewing machine frame, and the swinging members of each mechanism move the sewing needle up and down and back and forth. It is swung in time with the movement, and the feed adjuster is made up of an adjustment groove provided in each oscillation member and a fitting member that is displaceably fitted into the adjustment groove. Horizontal feed and cross feed were now provided.

For this reason, the mechanisms for imparting horizontal feed and cross feed become complicated, and the overall structure of the cloth feeding device including these mechanisms becomes large, and in particular, it is required to sew long and narrow cylindrical workpieces. It is extremely difficult to incorporate this large cloth feeding device into the cylindrical bed of a free arm sewing machine, which is narrow in height and width in the longitudinal direction.

Purpose of the invention This invention solves the above-mentioned defects in conventional sewing machines, has a simple and compact structure, and can be easily incorporated into the narrow cylindrical bed of a free arm sewing machine. The purpose is to provide a cloth feeding device for sewing machines.

Structure of the invention In order to achieve the above-mentioned object, this invention supports one swinging member so as to be swingable around a fixed axis extending in the vertical direction, and a first and a second swing member are mounted on the swinging member. adjustment grooves are provided, and first and second fitting members for controlling horizontal feed and lateral feed are displaceably fitted into each adjustment groove, and the swinging member is synchronized with the up and down reciprocating movement of the sewing needle. When shaken, the first
The motion of the second fitting member is transmitted via the connecting member to the support mechanism of the feed table on which the feed dog is placed, and horizontal feed and lateral feed are applied to the feed table. .

Embodiment Hereinafter, the structure of a free arm sewing machine embodying this invention will be explained in detail with reference to the drawings.

Now, in this embodiment, the sewing machine frame 1 has an arm 2, a column 3, and a cylindrical bed 4, and as shown in FIGS. 1 and 3, the top opening of the bed 4 has an opening for a feed dog. The plate 5 is attached, and a sewing needle (not shown) is supported on the head of the arm 2 above the throat plate 5 so that it can reciprocate vertically and swing horizontally (left and right). . As shown in FIGS. 1 and 2, a mounting plate 6 is disposed and fixed within the bed 4, and a horizontal hook 7 is rotatably supported on the upper surface of the mounting plate 6.

A drive shaft 8 rotatably driven by a motor (not shown) is supported within the support column 3 so as to be rotatable around a vertical axis, and a drive pulley 9 is fixed to the lower end of the drive shaft 8 . A driven pulley 10 is rotatably supported on the upper surface of the mounting plate 6, and a small pulley 11 is also provided on the rotating shaft of the horizontal hook 7, and a timing belt 1 is attached to each of the pulleys 9, 10, 11.
2 is hung under tension by a tension pulley 13. As the drive shaft 8 rotates, the horizontal hook 7 is rotated in synchronization with the vertical and reciprocating movement of the sewing needle, and a stitch pattern is formed on the workpiece cloth by the cooperation of the horizontal hook 7 and the sewing needle. It's getting old.

As shown in FIGS. 2 to 4, on the mounting plate 6,
A feed table 15 with a feed dog 14 mounted and fixed on its upper surface is enabled by a support mechanism 16 to perform four-movement feeding consisting of vertical feeding and horizontal feeding (back-and-forth feeding), and horizontal feeding in a direction perpendicular to the direction of horizontal feeding ( left/right feed)
Possibly supported.

That is, a support shaft 17 extending horizontally in the left-right direction is fixed to the rear portion of the upper surface of the mounting plate 6, and a support frame 18 having a planar substantially inverted U-shape is rotatably supported at the lower end of the support shaft 17. has been done. An intermediate shaft 19 is rotatably installed in the center of the support frame 18, and an operating shaft 20 is installed and supported at the upper end so as to be rotatable and movable in the left-right direction. Actuation axis 20
An engaging body 22 having an engaging groove 21 is fitted and fixed to approximately the center in the left-right direction, and a support pin 23 extending in the vertical direction is fixed to the left end (right end in FIG. 3). The feed table 15 has a bifurcated portion 24.
It is engaged with the actuating shaft 20 and supported so as to be movable up and down along a support pin 23, and is biased downward by a spring 25 on the support pin 23.

Therefore, when a vertical movement is applied to the lower end of the feed table 15, the feed table 15 is moved vertically along the support pin 23, and when a longitudinal movement is applied to the intermediate shaft 19, the support When the frame 18 is reciprocated in the same direction and the feed table 15 is moved horizontally, and the engaging body 22 is given a left-right movement, the operating shaft 20 is reciprocated in the same direction and the feed table 15 is moved horizontally. Transverse movement is performed.

In addition, in the support mechanism 16 of this embodiment,
When the feed table 15 is horizontally fed with the rotation of the support frame 18, the feed dog 14 is maintained in a horizontal state without being tilted. That is, as shown in FIGS. 1 to 4, the operating shaft 20
A regulation plate 26 is fixed to and extends horizontally to the front.
A regulating pin 27 erected on the mounting plate 6 is engaged with the lower surface of the front end by the action of a spring 28 . Therefore, even if the support frame 18 is rotated, the feed base 1
5 and the feed dog 14 are maintained in a horizontal state by engagement between the regulating plate 26 and the regulating pin 27, and are horizontally fed in the front-rear direction in this state.

On the other hand, between the driven pulley 10 and the support mechanism 16, a four-motion feed mechanism 29 and a horizontal feed mechanism 30 are provided, which provide four-movement feed to the support mechanism 16 in synchronization with the up and down reciprocating movement of the sewing needle. Mechanism 31
and a lateral feed mechanism 32 that similarly applies lateral feed to the support mechanism 16.

First, the vertical feed mechanism 29 in the four-motion feed mechanism 31 will be described in detail. As shown in FIG. 3, a side cam 33 is integrally formed on the lower surface of the driven pulley 10. As shown in FIGS. 2 and 3, a rotating lever 34 is rotatably supported on the mounting plate 6 in front of the support mechanism 16 by a support shaft 35 at approximately the center, and its left end (right end in FIG. 3) The feed table 15 is engaged with and placed on the horizontal engagement portion 36 of the slider 1 through a ball 37, and an eccentric pin 39 is attached to the right end (left end in FIG. 3) with a screw 38. A driven roller 40 is supported by the eccentric pin 39 so as to be rotatable and movable to two positions, before and after engaging and disengaging from the side cam 33, and is always held in the forward engagement position by the action of a leaf spring 41. has been done.

Therefore, when the driven pulley 10 is rotated with the rotation of the drive shaft 8, the rotating lever 34 is rotated back and forth via the driven roller 40 by the action of the side cam 33, and the rotating lever 34 is rotated back and forth via the ball 37 to the feed table 15. A vertical feed motion is applied to the The positions of the top dead center and bottom dead center of the feed dog 14 during the vertical feeding movement of the feed table 15 are determined by loosening the screw 38 and adjusting the rotation of the eccentric pin 39, so that the driven roller 40 relative to the rotation lever 34 can be adjusted. Adjustment settings can be easily made by changing the mounting height position.

Moreover, as shown in FIGS. 1 and 2, the side cam 33
A switching lever 42 for lowering the feed dog is rotatably supported by a support shaft 43 on the mounting plate 6 at the lower left side of the mounting plate 6. Depending on the situation, it can be switched between two positions, left and right. The switching lever 42
A pressing portion 46 is protruded from the rear end of the switching lever 4.
2 is switched and rotated from the left position to the right position shown in FIG. . Therefore, in the detached state of the driven roller 40, the rotation lever 34
can be rotated clockwise from the state shown in FIG. 3, and the feed bar 15 is moved downward by the action of the spring 25.
The feed dog 14 is lowered from the upper surface of the throat plate 5.

Next, the horizontal feed mechanism 30 in the four-movement feed mechanism 31 will be described in detail. As shown in FIGS. It is formed. As shown in Figures 1, 2 and 4, the triangular cam 4
On the mounting plate 6 in the vicinity of 7, a swinging member 48 which also serves as the lateral feed mechanism 32 is swingably supported via a support plate 50 by a fixed support shaft 49 extending in the vertical direction. The triangular cam 47 is held in the forked portion 51, and as the triangular cam 47 rotates, the triangular cam 47 is swung within a horizontal plane.

A horizontal feed adjuster 52 is provided on the lower surface of the swinging member 48 for controlling the horizontal feed movement of the feed dog 14.
is provided. That is, a first adjustment groove 53 is integrally formed on the lower surface of the swinging member 48 so as to extend in an arc shape in the left-right direction through the axis of the support shaft 49 within a horizontal plane orthogonal to the axis of the support shaft 49. and is open downwards. The first
A square piece-shaped first fitting member 54 for controlling horizontal feed is fitted into the adjustment groove 53 so as to be movable along the adjustment groove 53 . A connecting member 55 consisting of one lever is provided between the first fitting member 54 and the intermediate shaft 19 of the support mechanism 16, and as is particularly clear from FIG. It is pivotally connected to the fitting member 54 of 1, and is also pivotally connected to the intermediate shaft 19 by a pin 57 at the folded portion of the other end.

Therefore, as shown in Figs.
In the state where the first fitting member 54 is set and arranged at the inactive position on the axis of the support shaft 49, which is the center of swing of the first fitting member 54, even if the swing member 48 swings, the first fitting member 54 does not move back and forth.
No horizontal feed motion is imparted to the support mechanism 16.
In addition, when the first fitting member 54 is displaced and set to any operating position on the left normal feed side or the right reverse feed side in the first adjustment groove 53, the swing member 48 As the first fitting member 54 swings, the first fitting member 54 is reciprocated in the front-back direction according to the amount of displacement thereof, and the connecting member 5
A forward or reverse horizontal feed movement is applied to the intermediate shaft 19 of the support mechanism 16 via 5.

Next, to explain the lateral feed mechanism 32 in detail, as shown in FIGS. 1 and 2, a lateral feed adjuster 58 for controlling the lateral movement of the feed dog 14 is provided on the upper surface of the swinging member 48. It is provided. That is, a second adjustment groove 59 is integrally formed on the upper surface of the swinging member 48 so as to extend in an arc shape in the front-rear direction through the axis of the support shaft 49 within a horizontal plane orthogonal to the axis of the support shaft 49. It is open facing upwards. In this embodiment, the center of the arc of the first adjustment groove 53 and the support shaft 49 are
A straight line connecting the axis of the second adjustment groove 59 and a straight line connecting the center of the arc of the second adjustment groove 59 and the axis of the support shaft 49 are orthogonal to each other. Said second adjustment groove 5
9 has a square piece-shaped second
A fitting member 60 is fitted so as to be movable along the adjustment groove 59.

A connecting member 63 consisting of two levers 61 and 62, a first and second lever, is provided between the second fitting member 60 and the engaging body 22 of the support mechanism 16. A first lever 61 extending in the front-rear direction is rotatably supported on the mounting plate 6 by a support shaft 64 at the center, and is engaged at the rear end with the engagement groove 21 of the engagement body 22 in the support mechanism 16. An engaging pin 65 is provided to protrude. The second lever 62
It is provided between the front end of the lever 61 and the second fitting member 60, and is pivotally connected to both members 61, 60 by pins 66, 67 at both ends.

Therefore, as shown in FIGS.
In the state where the second fitting member 60 is set and arranged at the inactive position on the axis of the support shaft 49, which is the center of swing of the second fitting member 60, even if the swing member 48 swings, the second fitting member 60 is not moved left or right.
No lateral movement is imparted to the support mechanism 16.
Further, when the second fitting member 60 is displaced and set in the second adjustment groove 59 to any operating position on the forward normal feed side or the rear reverse feed side, the swinging of the swinging member 48 Accordingly, the second fitting member 60 is reciprocated in the left-right direction according to the amount of displacement thereof, and the connecting member 6
3, a forward or reverse (right or left) lateral movement is applied to the engaging body 21 of the support mechanism 16.

Further, in this embodiment, the first adjustment groove 53
A straight line connecting the center of the arc of the second adjustment groove 59 and the axis of the support shaft 49 is parallel to the horizontal feed direction, and a straight line connecting the center of the arc of the second adjustment groove 59 and the axis of the support shaft 49 is parallel to the horizontal feed direction. Since both straight lines are orthogonal to each other, the swinging motion of the swinging member 48 can be efficiently converted into horizontal feed and lateral feed motions, and these motions can be transferred to the feed dog 14 by a simple connection mechanism. can be transmitted.

On the other hand, as shown in FIG. 1, on the front surface of the column 3 of the sewing machine frame 1, an adjustment operation knob 68 as an adjustment operation body for changing the adjustment state of the horizontal feed adjuster 52 and the lateral feed adjuster 58 is rotatable. It is provided so that it can be operated. The adjustment operation knob 68 is provided with the horizontal feed adjuster 5 so that the operation position can be changed in correspondence with the pointer 69 on the front surface of the support column 3.
A first operation area 7 that changes only the adjustment state of No. 2.
0, and both horizontal feed and lateral feed adjusters 52, 58
A second operation area 71 for changing the adjustment state of at least the traverse feed adjuster 58 therein is continuously provided. Then, in the first operation area 70, F,
Feed amount indicator symbols 1, 2, 3, and 4 are attached, and a lateral feed adjuster 5 is provided in the second operation area 71.
an operating area 72 for the cross-feed adjuster that changes only the adjustment state of 8; and an operation area 7 for the double-feed adjuster that changes the adjustment state of both feed adjusters 52, 58;
3 is provided, and one area 72 has a feed rate indicator symbol, , and the other area 73 has a feed rate indicator symbol A, B, C.
is attached.

For example, when the adjustment operation knob 68 is set to the position of the feed amount indicator symbol 0 as shown in FIG. 55−15806
Due to the action of the well-known feed adjustment device as shown in the above publication, the horizontal feed adjustment device 52 is brought to the inactive position shown in FIGS. At the same time, the lateral feed adjustment is performed via a linkage device 82 consisting of a plurality of levers or links 78, 79, 80, 81, etc. by the action of a lateral feed adjustment cam (not shown) provided inside the adjustment operation knob 68. vessel 58 is the second
When the adjustment operation knob 68 is set to the inactive position shown in the figure, and when the adjustment operation knob 68 is set at any position in each operation area 70, 72, 73, both adjusters 52, 58 are adjusted according to the set position. One or both of them are set to the working position for normal feeding.

Furthermore, a push button 83 is provided at the center of the adjustment operation knob 68, and by pressing the push button 83, the setting of the horizontal feed adjuster 52 is changed to the reverse feed state via the linking device 77. It's summery. Also, the lever 78 of the linking device 82
An operating rod 84 is protruded from the top, and by moving the operating rod 84 upward, the setting of the lateral feed adjuster 58 is changed to the reverse feeding state via the linking device 82. .

Therefore, by rotating the adjustment operation knob 68 from the state shown in FIG.
When set to an arbitrary position in the center, only the first fitting member 54 of the horizontal feed adjuster 52 is displaced from the state shown in FIGS. The position is set and placed. Therefore, when the sewing machine is operated in this state, the sewing needle is reciprocated up and down, and the horizontal hook 7 is rotated.
In synchronization with this, the side cam 33 on the driven pulley 10
and the triangular cam 47 is rotated. Then, due to the action of the side cam 33, the support mechanism 16 is given vertical feed interlock via the rotary lever 34 of the vertical feed mechanism 29, etc., and along with the swinging of the swinging member 48 based on the action of the triangular cam 47. The first fitting member 54 is reciprocated in the front and back direction, and the horizontal feed mechanism 3
A horizontal feed motion is applied to the support mechanism 16 through the connecting member 55 of
performs normal four-movement feeding. Therefore, the feed dog 14 moves the work cloth backward, and the sewing needle and the horizontal hook 7 cooperate to create a normal pattern, that is, a straight stitch pattern when the swing amplitude of the sewing needle is set to zero. Alternatively, a zigzag stitch pattern can be formed when the swing amplitude of the sewing needle is set to a predetermined amount.

Further, the adjustment operation knob 68 is moved from the state shown in FIG. 1 to one operation area 7 in the second operation area 71.
When the setting is changed to any position in 2, the linking device 82
The second mating member 60 of the traverse feed adjuster 58 via
The only part is displaced from the state shown in FIG. 2 toward the forward normal feed side, and is set and arranged at an arbitrary operating position. Therefore, when the sewing machine is operated in this state, the support mechanism 16 is given vertical feed interlocking by the action of the vertical feed mechanism 29, and the second fitting member 60 is moved as the swinging member 48 swings. The support mechanism 16 is reciprocated in the left and right direction, and the support mechanism 16 is provided with a lateral feed interlock via the connecting member 63 of the lateral feed mechanism 32, and the feed dog 14
performs a combined feed motion of vertical feed and horizontal feed. Therefore, the work cloth is moved laterally by the feed dog 14, and a horizontal feed pattern is formed by the cooperation of the sewing needle and the horizontal hook 7.

Furthermore, when the adjustment operation knob 68 is changed from the state shown in FIG. 1 to an arbitrary position in the other operation area 73 in the second operation area 71, is displaced from the state shown in FIGS. 2 and 4 to the operating position on the normal feed side. Therefore, when the sewing machine is operated in this state, the vertical feed mechanism 29
The vertical feed movement of , the horizontal feed movement of the horizontal feed mechanism 30 and the lateral feed movement of the lateral feed mechanism 32 are respectively applied, and the feed dog 14 performs a composite feed movement of these. Therefore, the feed dog 14 transports the work cloth backward and laterally, and the sewing needle and the horizontal hook 7 work together to create, for example, a zigzag stitch pattern with a wider width than the normal zigzag stitch pattern described above. A horizontal pattern is formed.

It should be noted that this invention is not limited to the above-mentioned embodiments, and the configuration of each part can be arbitrarily changed and embodied without departing from the spirit of this invention.

Effects of the invention As detailed above, the cloth feeding device of this invention has
One swing member is supported swingably around a fixed axis extending in the vertical direction, and a first swing member is mounted on the swing member.
and second adjustment grooves are provided, and first and second fitting members for controlling horizontal feed and lateral feed are displaceably fitted in each adjustment groove, and are oscillated in synchronization with the up and down reciprocating movement of the sewing needle. When the movable member is oscillated, the accompanying interlocking movement of the first and second fitting members is transmitted via the connecting member to the support mechanism of the feed stand on which the feed dog is mounted, and the feed stand is provided with horizontal feed and By being configured to provide lateral feed, the structure can be simple and compact, and it can be easily incorporated into the narrow cylindrical bed of a free arm sewing machine.

[Brief explanation of the drawing]

Figure 1 is a partial cross-sectional view of a sewing machine that embodies this invention, taken longitudinally and seen from the front side; Figure 2 is a partially enlarged cross-sectional view of the sewing machine, seen from the plane side;
FIG. 3 is a partial cross-sectional view similarly taken longitudinally and viewed from the back side, and FIG. 4 is a partial cross-sectional view similarly taken cross-sectionally and viewed from the bottom side. Sewing machine frame...1, bed...4, feed dog...14, feed stand...15, support mechanism...16,
Swinging member...48, Support shaft...49, First adjustment groove...53, First fitting member...54, Connection member...
...55, second adjustment groove...59, second fitting member...60, connecting member...63.

Claims (1)

[Claims for Utility Model Registration] 1. A feed table 15 on which a feed dog 14 is mounted is supported so as to be capable of four-movement feeding consisting of vertical feeding and horizontal feeding, and lateral movement in a direction orthogonal to the horizontal feeding direction. A support mechanism 16 that supports the sewing needle so that it can be fed; a swinging member 48 that swings in synchronization with the vertical reciprocating movement of the sewing needle around a fixed axis that extends in the vertical direction; first and second adjusting grooves 53, 59 provided in the rocking member 48, each extending in one plane through its fixed axis; First and second fitting members 54 and 6 that fit into the second adjustment grooves 53 and 59 and are movable along the adjustment grooves 53 and 59, respectively.
0, and each of the fitting members 54, 6 in order to transmit the movement of the first and second fitting members 54, 60 accompanying the swinging of the swinging member 48 to the support mechanism 16.
0 and the support mechanism 16, a connecting member 55,
A cloth feeding device for a sewing machine including 63. 2. The sewing machine cloth according to claim 1, wherein the first and second adjustment grooves 53, 59 are open upwardly and downwardly and are formed integrally with the swinging member 48. Feeding device. 3 The first and second adjustment grooves 53 and 59 are formed in an arc shape, and a straight line connecting the center of the arc of the first adjustment groove 53 and the fixed axis line and the arc of the second adjustment groove 59 The fabric feeding device for a sewing machine according to claim 1 or 2, wherein straight lines connecting the center and the fixed axis are orthogonal to each other.