JP2010246839A - Sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To conduct feed adjustment accurately by placing a vertical feed shaft on the upstream side in the cloth feeding direction against a horizontal feed shaft. <P>SOLUTION: A sewing machine includes a feed adjustment mechanism 60 provided with a motion controlling link 61 one end of which is connected to another end of a motion transforming rod 50, a feed adjusting body 62 which is connected to the other end of the motion controlling link 61 and is supported in a rotatable manner inside a sewing machine frame 20, a rotation supporting shaft 63 which is installed fixedly to the feed adjustment body, and a fixed input arm 68 which is installed to the supporting shaft fixedly and rotates in an integrated manner. The vertical feed shaft 43 is placed on the upstream side in the cloth feeding direction against the horizontal feed shaft 46 and the fixed input arm 68 and the other end of a connecting rod 67 are connected with each other to adjust the angle of the feed adjusting body 62 by the forward and backward motion of the connecting rod. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a sewing machine including a cloth feed adjusting mechanism.

As shown in FIG. 10, a conventional sewing machine 200 includes a vertical feed shaft 202 that receives power from a main shaft 201 supported by a sewing machine frame (not shown), a horizontal feed shaft 203 that receives power from the vertical feed shaft 202, and a feed shaft. A feed mechanism having a feed dog (not shown) to which a vertical reciprocating motion and a reciprocating motion along the cloth feeding direction are applied is provided.
One end of a rod 205 is connected to the vertical feed shaft 202 via an eccentric cam 204, and the first link body 206, 206 and the second link body 207, 207 are connected to the other end of the rod 205. The first link bodies 206 and 206 are connected to an input arm 208 that rotates together with the horizontal feed shaft 203. The second link bodies 207 and 207 are connected to a feed adjusting body 210 that is pivotally supported by a support shaft 209 that is parallel to the vertical feed shaft 202. The feed adjusting body 210 can be rotated around the support shaft 209 to increase / decrease or reverse the angular range of reciprocating rotation transmitted from the vertical feed shaft 202 to the horizontal feed shaft 203. That is, by changing the magnitude of the rotation angle transmitted to the horizontal feed shaft 203, the horizontal reciprocation range of the feed dog can be changed, and by reverse, the forward feed and the reverse feed can be changed, The feed amount is adjusted by these.

  In the conventional sewing machine 200, in order to freely adjust the angle of the feed adjusting body 210, a feed dial 211 for performing a feed amount adjusting operation, a feed adjusting screw 212 for moving forward and backward by the dial 211, and a screw 212 A feed adjustment base 213 that rotates by contact and generates an angle change, a connecting rod 214 that moves up and down by the rotation of the adjustment base 213, and a conversion shaft 215 that is connected to the rod 214 and supported by the sewing machine frame. An input arm 216 that moves is provided, and an output arm 218 that is fixedly supported by the conversion shaft 215 and connected to the feed adjusting body 210 via a link body 217.

  The feed adjusting base 213 is formed with two opposing slopes, and the connecting portion with the connecting rod 214 is pulled downward so that the tip of the feed adjusting screw 212 contacts one of the slopes (not shown). A tension spring is provided. When the feed dial 211 is rotated, for example, counterclockwise while maintaining the contact state by the tension spring, the feed adjustment screw 212 presses the feed adjustment table 213 via the slope, so that the feed adjustment table 213 is The rotation is performed around the support shaft, the connecting rod 214 is pulled down, and the input arm 216 is rotated. As a result, the output arm 218 is also rotated in the same direction via the conversion shaft 215, the feed adjusting body 210 is rotated around the support shaft via the link body 217, and the feed amount is adjusted. Yes.

  Since the second link bodies 207 and 207 having one end connected to the feed adjusting body 210 are connected to the rod 205 at the other end, the end of the rod 205 has the link body 207 as a radius. It has a function of restricting reciprocation along an arc locus. As a result, when the angle of the feed adjusting body 210 changes, the center position of the arc locus whose radius is the link body 207 changes, so the direction of the arc locus drawn by the end of the rod 205 changes, and the horizontal feed shaft 203 reciprocates. The motion component in the direction of imparting motion increases or decreases, and the angular range of the reciprocating rotation of the horizontal feed shaft 203 can be adjusted.

  Further, the conventional sewing machine 200 includes a switching lever 219 for switching the slope of the feed adjusting base 213 with which the tip of the feed adjusting screw 212 abuts, and a switching solenoid 220 for performing switching similar to the switching lever 219. It is also possible to switch the feed direction.

JP 2006-116290 A

However, the conventional sewing machine 200 has a very large number of members that perform operation transmission from the feed dial 211 adjusted by the operator to the feed adjusting body 210 that actually changes the feed amount, and is complicated. It has been. For this reason, if the processing accuracy and assembly accuracy of all transmission members are not sufficiently high, rattling, falling down, friction, etc. are likely to occur, and accurate feeding cannot be performed or operation becomes unstable. There was a fear.
In addition, when switching to the reverse feed motion by the switching solenoid 220, there is a problem that the torque for moving the mechanism increases due to the large number of parts, and the responsiveness of the solenoid deteriorates. It was.

  An object of the present invention is to reduce the number of parts, prevent backlash, and stabilize the operation.

  The invention according to claim 1 is characterized in that a feed dog (41) that feeds and sews the material to and from the needle plate (11), and a vertical feed shaft (43) that gives a vertical reciprocating motion to the feed dog by a rotation operation. A horizontal feed shaft (46) for applying a reciprocating motion in the cloth feed direction to the feed dog by obtaining power from the vertical feed shaft and performing a reciprocating rotational motion; A motion conversion rod (50) for performing a reciprocating motion for imparting reciprocal rotation to the horizontal feed shaft at an end, a rotary arm (51) fixed to the horizontal feed shaft and rotating together; Adjustment that performs forward and backward movement by rotating the feed dial (64) and a feed mechanism (40) that includes a transmission link (53) that connects the other end of the motion conversion rod and the rotation end of the input arm. The adjustment member comes into contact with the member (65) and the cam surface (66b). A feed adjustment mechanism (66) including a cam member (66) whose posture changes by rotating, and a connecting transmission rod (67) having one end connected to the cam member and moving forward and backward along its longitudinal direction. 60), the feed adjusting mechanism includes an operation restricting link (61) having one end connected to the other end of the operation converting rod and an other end of the operation restricting link. The feed adjustment body (62) supported rotatably in the sewing machine frame (20), the pivot shaft (63) fixedly mounted on the feed adjustment body, and fixedly mounted on the support shaft. A fixed input arm (68) that integrally rotates, and the vertical feed shaft is disposed upstream of the horizontal feed shaft in the cloth feed direction, and the fixed input arm and the connection transmission rod Connect the other end to And performing angle adjustment of the adjuster feed by forward and backward movement of the transmission rod.

  The invention described in claim 2 has the same configuration as that of the invention described in claim 1, and further includes a switching solenoid (69) for switching the feed adjusting body to a constant rotation angle.

  The invention described in claim 3 has the same configuration as that of the invention described in claim 2, and the sewing machine is provided with a protective support (23) at the end of the bottom of the sewing machine bed on the side of the vertical body (22) of the sewing machine. ), And the switching solenoid is supported by the column.

  The invention according to claim 4 has the same configuration as that of the invention according to claim 3, and the switching solenoid is attached to the support column so that the body can be adjusted in the mounting position along the forward / backward direction of the plunger. It is characterized by being supported.

  The invention according to claim 5 has the same configuration as that of the invention according to claim 4, and the switching solenoid is configured such that the plunger advance / retreat direction is inclined with respect to the horizontal and cloth feed direction. It is attached to the said support | pillar.

  The invention according to claim 6 has the same configuration as that of the invention according to claim 5, and when the sewing machine frame is tilted to a predetermined tiltable position, the switching solenoid has its plunger advancing and retracting direction before tilting. It is characterized by being attached to the support column so as to be closer to the horizontal state than the state.

The invention according to claim 7 has the same configuration as that of the invention according to any one of claims 1 to 6, and is arranged to face the cam member with the adjustment member interposed therebetween as the cam surface. The cam surface for forward feed and the cam surface for reverse feed are formed.
A switching lever (71) for switching from a state in which one of the cam surfaces is in contact with the adjusting member to a state in which the cam surface is in contact with the other cam surface is provided.

  According to the first aspect of the present invention, the fixed input arm of the support shaft provided on the feed adjusting body is connected to the connecting rod that moves forward and backward by the cam member, and the operation from the adjusting member to the feed adjusting body is compared with the conventional sewing machine. The number of transmission members can be greatly reduced (for example, the conversion shaft 215, the link body 217, the output arm 218, etc. shown in FIG. 10 are unnecessary), and the influence of the processing accuracy and assembly accuracy of each member is reduced. It is possible to suppress rattling, falling, friction and the like. As a result, it is possible to feed with high accuracy and to improve the sewing quality. Also, the operation during sewing is stable.

Furthermore, there are many conventional sewing machines in which the vertical feed shaft is arranged downstream in the cloth feed direction with respect to the horizontal feed shaft. In such an arrangement, the vertical movement of the feed dog is performed on the horizontal feed shaft side. Since vertical movement is given on the vertical feed shaft side as a fulcrum, the feed operation is performed so that the vertical amplitude is larger on the downstream side of the feed dog in the feed direction, causing the cloth presser to jump and accurately. There is a problem that good feeding cannot be performed.
On the other hand, in the sewing machine, a feed dial, a switching lever (see claim 7), and other components that are operated by an operator are usually arranged on the upstream side (operator side) of the sewing machine frame in the cloth feed direction.
Therefore, in the case of the above-described conventional shaft arrangement, it is necessary to bypass the motion transmission path in order to avoid interference with the configuration operated by the operator, and the connecting rod and the input arm of the support adjusting shaft are directly connected. In other words, the connecting rods need to be bent or bent to avoid interference. As a result, the number of parts cannot be reduced, and the occurrence of rattling, falling, friction, etc. cannot be suppressed due to the processing accuracy and assembly accuracy of each member, and the bending shape of the connecting rod may be bent. As a result, there arises a problem that the operation can be accurately transmitted.
However, in the present invention, the vertical feed shaft is arranged upstream of the horizontal feed shaft in the cloth feed direction, so that the problem of jumping of the cloth feed due to the shaft arrangement is solved, and good and accurate feed is realized. .
Furthermore, the above-described shaft arrangement eliminates the need for a new member for bypassing the configuration for the operator to operate and eliminates the need for the connecting rod to be curved or bent. It is possible to suppress the friction and the like, improve the sewing quality by feeding with high accuracy, and improve the stability of the sewing operation. That is, the present invention realizes a good feed operation by the synergistic effect of the shaft arrangement of the vertical feed shaft and the horizontal feed shaft and the direct connection structure of the feed adjustment mechanism.

According to the second aspect of the present invention, by reducing the number of members of the feed adjusting mechanism, the number of members that operate when the switching solenoid is operated is also reduced, improving the response of the switching solenoid and making it operate smoothly. It becomes possible. Also, a large solenoid with a large output can be dispensed with.
It is assumed that the rotation angle of the feed adjusting body that is switched by the switching solenoid is smaller than the feed pitch adjusted by the feed dial (in the case of a configuration that allows reverse feed, it is adjusted by the feed dial. Within the range smaller than the absolute value of the feed pitch). Therefore, the rotation angle of the feed adjusting body by the switching solenoid is changed to a feed pitch smaller than the feed pitch at the time of normal sewing, for example, the switching solenoid is operated at the time of performing the condensation sewing, and the feed suitable for condensation sewing is used. Suitable for applications such as switching to pitch. The application is not limited to the use of condensed stitching.

  In the third aspect of the invention, since the switching solenoid is supported by the support column, a dedicated member for supporting the switching solenoid is not required, and the number of parts can be reduced.

According to a fourth aspect of the present invention, the main body (coil side) of the switching solenoid is supported by the support so that the attachment position can be adjusted along the forward and backward direction of the plunger. The solenoid can pull the plunger to the bottom of the coil by exciting the coil, and the position of the bottom of the coil can be adjusted by adjusting the position of the main body, thereby adjusting the pull-in position of the plunger. . That is, by adjusting the position of the switching solenoid, the feed adjusting body can be adjusted to be switched to an arbitrary rotation angle.
In addition, the adjustment of the position of the main body of the switching solenoid adjusts the target rotation angle of the feed adjustment body, so that the plunger can always be pulled to the bottom of the coil during operation, and stable thrust is always maintained even when the position is adjusted. It becomes possible to operate with.

  The invention according to claim 5 is attached to the support column so that the plunger advancing / retreating direction of the switching solenoid is inclined with respect to the horizontal state along the cloth feeding direction. It can be arranged in a small space. In particular, it is difficult to secure the arrangement space of the solenoid in which the plunger moves forward and backward. However, the installation space can be more easily secured by arranging the solenoid in this manner.

  According to the sixth aspect of the present invention, when the sewing machine frame is tilted to a predetermined tiltable position, the switching solenoid is tilted so that the plunger advancing / retreating direction tilts closer to the horizontal state than the state before tilting, and is attached to the column. Therefore, when the sewing machine frame is tilted to adjust the target rotation angle of the feed adjustment body by the switching solenoid, the switching solenoid can be brought into a state that is almost horizontal, and the movement adjustment of the main body can be performed. In such a case, it is possible to suppress the situation of moving to an unintended position, and to perform adjustment work easily and smoothly.

  According to the seventh aspect of the present invention, since the switching lever for switching the contact state of the cam surface is provided, it is possible to smoothly switch between the forward and reverse feeding operations. Further, since the above-described predetermined shaft arrangement and position switching mechanism are configured as described above, even when the above-described switching lever is provided, the sewing quality is improved by accurate feeding and the stability of the sewing operation is improved. Can be planned.

It is the block diagram which illustrated only the principal part structure in the bed part mentioned later of the sewing machine which is embodiment of invention by planar view. It is sectional drawing along the VV line in FIG. It is sectional drawing along the WW line in FIG. It is a perspective view of a feed adjustment mechanism. It is a perspective schematic diagram for demonstrating the adjustment effect | action of the feed amount of a feed adjustment body. It is the schematic diagram seen from the left side surface for demonstrating the adjustment effect | action of the feed amount of a feed adjustment body. It is a right view of a sewing machine bed part. It is a right view which shows the example which fixed the switching solenoid with the stopper fixed to the support | pillar with a screw. It is sectional drawing which looked at the inside of a sewing machine from the right side. It is a perspective view of the conventional feed adjustment mechanism of a sewing machine.

(Overall configuration of the embodiment of the invention)
Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. FIG. 1 is a configuration diagram illustrating only a configuration of a main part in a bed portion 21 to be described later of a sewing machine 10 according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line VV in FIG. 3 is a cross-sectional view taken along line WW in FIG.
The sewing machine 10 includes a needle up-and-down movement mechanism (not shown) that moves the sewing needle up and down, a sewing machine motor (not shown) that is a driving source thereof, and a hook mechanism that binds the lower thread to the sewing thread that is inserted into the sewing thread by the full rotation hook 31. 30, a cloth feed mechanism 40 that feeds the cloth to be sewn on the needle plate 11 in accordance with the vertical movement of the sewing needle, a feed adjustment mechanism 60 that adjusts the feed amount of the cloth feed mechanism 40, and the needle plate 11 A cloth presser 19 that presses and holds the cloth from above and a sewing machine frame 20 that supports the above-described components are provided.

(Sewing frame)
The sewing machine frame 20 includes a bed portion 21 positioned at the lower portion of the entire sewing machine 10, a vertical body portion 22 erected upward at one longitudinal end portion of the sewing machine bed portion 21, and an upper end portion of the vertical body portion 22. An arm portion (not shown) extending in the same direction as the bed portion 21 is provided.
The bed portion 21 is horizontal in the longitudinal direction with the sewing machine 10 installed on a horizontal plane. In the following description, the longitudinal direction of the bed portion 21 is defined as the Y-axis direction, the direction parallel to the horizontal plane and orthogonal to the Y-axis direction is defined as the X-axis direction, and the direction orthogonal to the X-axis and Y-axis directions is defined as Z. Axial direction. Also, in one direction in the Z-axis direction, the upper side is “upper”, the lower side is “lower”, and the direction in which the operator is positioned with respect to the sewing machine in one direction in the X-axis direction is “front” (or upstream in the cloth feed direction). Side), the opposite side is “rear” (or the downstream side in the cloth feed direction), the left side when viewed from the operator side in one direction in the Y-axis direction is “left”, and the right side is “right”.

(Needle plate and cloth presser)
As shown in FIG. 3, the throat plate 11 is provided on the upper surface of the bed portion 21 and at the end opposite to the vertical trunk portion 22. The needle plate 11 is formed with a needle hole through which a sewing needle is inserted and a through hole 11a in which a feed dog 41 of a cloth feed mechanism 40 described later appears and disappears.
The cloth presser 19 is disposed at a position directly above the needle hole and the through hole 11 a of the needle plate 11, and is pressed downward via a cloth presser bar 18 that supports the cloth presser 19. The cloth presser 19 is arranged on the throat plate 11 with its longitudinal direction along the X-axis direction, and is located downstream of the intermediate position in the longitudinal direction of the cloth presser 19 in the cloth feed direction (left side in FIG. 3). It is supported at a somewhat offset position. Further, the cloth presser 19 is connected to the lower end portion of the cloth presser bar 18 via a support shaft along the Y-axis direction, so that both ends of the cloth presser 19 can be swung somewhat in the vertical direction. It has become.

(Needle vertical movement mechanism and sewing machine motor)
The needle up-and-down moving mechanism is disposed inside the arm portion, is rotationally driven by the sewing machine motor and is disposed along the Y-axis direction, a needle bar that holds the sewing needle at the lower end portion, A known crank mechanism that converts the rotational driving force of the upper shaft 12 into a reciprocating driving force that moves up and down and transmits it to the needle bar. The upper shaft 12 is fixedly equipped with a pulley 14 that hangs a timing belt 13 for transmitting a rotational driving force to an upper and lower feed shaft 43 of a cloth feed mechanism 40 described later on an end portion on the vertical body portion 22 side. ing. The timing belt 13 is suspended in the vertical body portion 22 in a state where the timing belt 13 is slightly inclined with respect to the Z-axis direction.
The sewing machine motor is provided inside the end portion of the arm portion on the vertical body portion side, and rotationally drives the upper shaft 12. The output shaft of the sewing machine motor is directly connected to one end portion of the upper shaft 12, which is a so-called direct drive system.

(Hook mechanism)
The hook mechanism 30 is provided inside the bed portion 21, holds the full rotary hook 31 described above and the full rotary hook 31 at one end thereof, and rotates in a state along the Y-axis direction in the bed portion 21. The hook shaft 32 is supported so as to be able to support the speed increasing gear 33 provided at the other end of the hook shaft 32.
As shown in FIG. 1, the hook shaft 32 is disposed at the center position in the X-axis direction and in parallel with the Y-axis direction in the bed portion 21, so as to correspond to the arrangement of the entire rotary hook 31. Further, the speed increasing gear 33 provided on the shuttle shaft 32 meshes with a main driving gear 48 provided on a vertical feed shaft 43 of the cloth feed mechanism 40 described later, and torque is transmitted from the upper shaft 12 to the vertical feed shaft 43. Further, torque is applied from the vertical feed shaft 43 to the shuttle shaft 32. The speed increasing gear 33 has half the number of teeth with respect to the main driving gear 48, and the shuttle shaft 32 rotates at a double speed of the vertical feed shaft 43 and the upper shaft 12.
The full rotary hook 31 is composed of an inner hook and an outer hook, and the inner hook is provided with a bobbin around which a lower thread is wound, and the outer hook is held by the hook shaft 32 so as to rotate. It has become. The outer hook is provided with a sword tip that captures the sewing thread from the sewing needle to form a loop.When the loop of the sewing thread is caught during rotation, the sewing thread is carried so that the inner hook passes through the loop, and the inner hook The lower thread fed from the bobbin is inserted into the upper thread loop. As a result, a knot between the upper thread and the lower thread is formed, and sewing is performed.

(Cloth feed mechanism)
2 and 3, the cloth feed mechanism 40 includes a feed dog 41 that feeds the cloth in a predetermined direction from the through hole 11 a to the upper surface of the needle plate 11, a feed base 42 that holds the feed tooth 41, and A vertical feed shaft 43 that rotates to reciprocate the feed base 42 in the vertical direction (Z-axis direction) and a reciprocating rotation to reciprocate the feed base 42 in the feed direction (X-axis direction). A horizontal feed shaft 46 to be performed, an eccentric rod 50 as an operation conversion rod for converting the rotational driving force of the vertical feed shaft 43 into a reciprocating rotational driving force by an eccentric cam 49, and applying it to the horizontal feed shaft 46; A horizontal feed arm 47 that transmits the reciprocating motion of 46 to the feed base 42, and a transmission rod 45 that converts the rotational driving force of the vertical feed shaft 43 into a reciprocating vertical motion by the eccentric cam 44 and transmits it to the feed base 42. I have.

  The vertical feed shaft 43 is supported in the bed portion 21 so as to be rotatable along the Y-axis direction, and is upstream of the cloth feed direction with respect to the hook shaft 32 (the right side in FIGS. 2 and 3, the sewing machine). It is arranged on the operator side). A pulley 56 to which the rotational driving force of full rotation is transmitted from the upper shaft 12 through the timing belt 13 is fixedly installed at one end portion of the vertical feed shaft 43 on the vertical body portion 22 side. The pulley 56 has the same number of teeth as the pulley 14 of the upper shaft 12 described above, and the vertical feed shaft 43 has the same rotational driving force in the same direction as the upper shaft 12 (clockwise direction in FIGS. 2 and 3). Is transmitted.

  The other end of the vertical feed shaft 43 extends to the lower side of the needle plate 11, and an eccentric cam 44 is fixedly mounted on the other end. Then, one end portion of the transmission rod 45 is connected to the vertical feed shaft 43 through the eccentric cam 44 so as to be rotatable. The transmission rod 45 rotatably holds the circular eccentric cam 44 at one end thereof, and the other end is rotatably connected to one end of the feed base 42. Since the transmission rod 45 has a connecting end with the feed base 42 located substantially above the connecting end with the vertical feed shaft 43, the eccentric cam 44 reduces the amount of eccentricity when the vertical feed shaft 43 rotates. A driving force for reciprocating movement along the vertical direction is applied to one end of the feed base 42 with a double stroke.

Further, an eccentric cam 49 is also fixedly installed in the vicinity of one end portion of the vertical feed shaft 43 on the vertical body portion 22 side, and the eccentric rod 50 is connected through the eccentric cam 49. The eccentric rod 50 has a circular eccentric cam 49 rotatably held at one end portion thereof, and the other end portion extends substantially in the horizontal direction. Therefore, the vertical feed shaft 43 rotates at the other end portion. Then, the eccentric cam 49 performs a reciprocating operation along the horizontal direction with a stroke twice as much as the eccentric amount.
On the other hand, a horizontal feed shaft 46 disposed parallel to the vertical feed shaft 43 is fixedly equipped with a rotating arm 51 extending to the vertical feed shaft 43 side. The other end portion of the eccentric rod 50 and the rotating end portion of the rotating arm 51 are connected by a transmission link 53. Further, the other end portion of the eccentric rod 50 is also connected to the other end portion of the operation restricting link 61 whose one end portion is connected to the feed adjusting body 62 of the feed adjusting mechanism 60, and is provided from the eccentric cam 49 on one end side. The reciprocating motion direction of the other end portion of the eccentric rod 50 can be changed and adjusted by the motion restricting link 61 and the feed adjusting body 62. The reciprocating rotation angle range applied from the vertical feed shaft 43 to the horizontal feed shaft 46 is adjusted according to the reciprocating motion direction of the other end portion of the eccentric rod 50 to be changed and adjusted. The adjustment of the reciprocating rotation angle range will be described in detail when the feed adjustment mechanism 60 is described.

  The horizontal feed shaft 46 is supported in the bed portion 21 so as to be rotatable along the Y-axis direction, and is disposed on the downstream side of the cloth feed direction with respect to the hook shaft 32 (left side in FIGS. 2 and 3). Has been. A reciprocating rotational driving force is applied to one end portion of the horizontal feed shaft 46 on the vertical body portion 22 side from the vertical feed shaft 43 via the above-described pivot arm 51, and from the other end portion via the horizontal feed arm 47. A reciprocating driving force along the X-axis direction is transmitted to the feed base 42.

The horizontal feed arm 47 is fixedly connected at its base end to the end of the horizontal feed shaft 46 on the needle plate 11 side, and its swing end is connected to the feed base 42 in a state of being directed substantially upward. .
The feed base 42 is disposed below the needle plate 11, one end in the cloth feed direction (X-axis direction) is connected to the vertical feed shaft 43 via the transmission rod 45, and the other end via the horizontal feed arm 47. Are connected to a horizontal feed shaft 46. Further, a feed dog 41 is fixedly installed at the upper part of the intermediate position in the longitudinal direction of the feed table.
As a result, the feed base 42 is given a reciprocating drive force in the vertical direction from one end thereof, and a reciprocating drive force in the feed direction is given from the other end in the same cycle. Then, by combining these reciprocating driving forces, an ellipse motion is performed along the XZ plane. The feed dog 41 also moves in an elliptical manner along with the feed base 42, and the tip of the feed dog 41 protrudes upward from the through hole 11a of the needle plate 11 when passing through the upper region of the ellipse motion trajectory. It is possible to send.

(Feed adjustment mechanism: overview)
FIG. 4 is a perspective view of the feed adjusting mechanism 60. The feed adjustment mechanism 60 includes an operation restriction link 61 having one end connected to the other end of the eccentric rod 50 of the cloth feed mechanism 40 and a feed adjustment body 62 to which the other end of the operation restriction link 61 is connected. A rotation support shaft 63 that is integrated with the feed adjustment body 62 along the Y-axis direction, a feed dial 64 that performs a feed amount adjustment operation, and a feed adjustment member that moves forward and backward with the dial 64. A feed adjusting screw 65, a feed adjusting base 66 as a cam member that rotates when the screw 65 abuts to produce an angle change, and a connecting rod 67 having an upper end connected to the rotating end of the adjusting base 66. A first fixed input arm 68 fixedly connected to the rotary support shaft 63 and connected to the lower end of the connecting rod 67, a switching solenoid 69 for switching the feed adjusting body 62 to a fixed target angle, and a rotary support Fixed to shaft 63 And a second fixed input arm 70 connected to the plunger of the solenoid 69, a switching lever 71 for performing a main operation for switching the cloth feeding direction to the reverse feeding, and a shaft portion 71a of the switching lever 71. And an input arm 72 that imparts an upward movement to the connecting rod 67.

(Feed adjusting mechanism: Feed adjusting body)
FIG. 5 and FIG. 6 are schematic diagrams for explaining the adjusting operation of the feed amount of the feed adjusting body 62. As shown in the figure, the other end of the eccentric rod 50 is connected to a rotating arm 51 via a connecting link 53, and a reciprocating rotating operation is applied from the rotating arm 51 to the horizontal feed shaft 46. One end of the operation restriction link 61 is connected to the other end of the eccentric rod 50, and the other end of the operation restriction link 61 is connected to the feed adjustment body 62. Note that all of the connecting portions of the eccentric rod 50, the connecting link 53, the rotating arm 51, the operation restricting link 61, and the feed adjusting body 62 are connected so as to be rotatable about the Y axis. As a result, the other end of the eccentric rod 50 is restricted so that it can move only along a trajectory along the arc R1 with the radius between the connecting shafts at both ends of the operation restricting link 61 as the radius. The center of the arc R1 is a connecting portion between the operation restricting link 61 and the feed adjusting body 62, and the position of the connecting portion (the center of the arc) is such that the feed adjusting body 62 rotates to cause an angle change. Will change.
As shown in FIG. 5, the other end of the eccentric rod 50, the connection link 53, and the operation restriction link 61 are connected by the same axis, and their center line and the rotation support shaft of the feed adjusting body 62 are connected. The center line 63 is designed to be on the same axis.

Under such a premise, when the feed adjusting body 62 is rotated in the clockwise direction in FIG. 6 from the position indicated by the solid line in FIG. 6 to the position indicated by the two-dot chain line, the reciprocating rotation transmitted to the horizontal feed shaft 46. The angle gradually decreases, and the reciprocating rotation angle becomes 0 at the position of the two-dot chain line. That is, the position indicated by the two-dot chain line indicates that the connecting end portion of the operation restricting link 61 with the feed adjusting body 62 and the connecting end portion of the transmission link 53 with the rotating arm 51 are on the same axis in the Y-axis direction. In this position, the transmission link 53 turns around the connecting end with the turning arm 51 (R2 in the drawing), and no torque is applied to the turning arm 51. It becomes a state.
Further, when the feed adjusting body 62 is further rotated in the clockwise direction in FIG. 6 from the angle indicated by the two-dot chain line in FIG. 6, the rotation operation is gradually transmitted to the rotating arm 51. In this case, the phase of the transmitted reciprocating rotation operation is reversed, and the operation transmitted to the feed dog 41 is switched to the reverse feed operation.
In this way, by setting the feed adjusting body 62 to the position of the two-dot chain line, the feed amount is set to 0, and when it is turned counterclockwise from that position, the feed amount is increased by forward feed according to the turn amount. If it is turned clockwise, the feed amount can be increased by reverse feed according to the turn amount. The feed dial 64, the switching solenoid 69, and the switching lever 71 are all configured to obtain a desired feed amount by applying a turning operation to the feed adjusting body 62.

(Feed adjustment mechanism: motion transmission element from the feed dial to the feed adjuster)
The feed dial 64 is provided so as to be rotatable around the X axis on the surface facing the operator who performs the sewing work in the vertical body portion 22 of the sewing machine frame 20. The feed dial 64 has a screw shaft (not shown) and is screwed into a screw hole (not shown) provided in the feed adjusting screw 65. The feed adjusting screw 65 is supported so as to be movable back and forth along the X-axis direction in the vertical body portion 22, and its rotation is restricted so as not to rotate with the feed dial 64. Thus, when a rotation operation is applied to the feed dial 64, the feed adjustment screw 65 can be moved back and forth along the X-axis direction according to the amount of operation.

The feed adjustment base 66 is arranged in the vertical body portion 22 so as to be aligned with the feed adjustment screw 65 in the X-axis direction, and is supported so as to be swingable around the Y-axis. That is, the feed adjustment base 66 includes a support shaft 66a extending in the Y-axis direction at an intermediate position thereof, and the end portion of the feed adjustment screw 65 is placed on one end side in the X-axis direction across the support shaft 66a. A cam surface 66b composed of two inclined surfaces in contact with each other is formed, and the other end in the X-axis direction is connected to the upper end of the connecting rod 67 so as to be rotatable around the Y-axis.
The cam surface 66b of the feed adjusting base 66 is formed with inclined surfaces that face each other in a V shape with the tip of the feed adjusting screw 65 interposed therebetween. The other end of the feed adjusting base 66 is always under tension by a tension spring (not shown) provided on the connecting rod 67, and the lower inclined surface is brought to the tip of the feed adjusting screw 65 by this tension. In the abutted state, the feed adjusting screw 65 moves backward in the counterclockwise direction of FIG. 4 to move the connecting rod 67 downward and through the first fixed input arm 68 to rotate. The shaft 63 and the feed adjusting body 62 can be rotated counterclockwise to increase the forward feed amount.
Further, when the feed adjusting screw 65 is advanced to a portion that becomes a valley between the two inclined surfaces, the angle of the feed adjusting base 66 at that time is such that the feed adjusting body 62 is at a position where the aforementioned feed amount becomes zero. Designed.
Further, when the lower inclined surface of the feed adjusting base 66 is in contact with the tip of the feed adjusting screw 65 and is rotated further in the clockwise direction in FIG. The tension spring (not shown) provided on the cam surface is provided so as to generate tension in the clockwise direction of FIG. 4 beyond the dead point. As a result, the upper inclined surface of the cam surface is fed and adjusted. It can be brought into contact with the tip of the screw 65. In this state, when the feed adjusting screw 65 is moved backward, the feed adjusting base 66 is rotated in the clockwise direction in FIG. 4 and the connecting rod 67 is moved up and rotated via the first fixed input arm 68. The shaft 63 and the feed adjusting body 62 can be rotated counterclockwise to increase the reverse feed amount.

The connecting rod 67 is provided inside the vertical body portion 22 with the upper end portion thereof slightly tilted toward the operator side and generally along the vertical direction. As described above, the connecting rod 67 has an upper end connected to the feed adjustment base 66 and a lower end connected to the rotating end of the first fixed input arm 68. The feed adjustment body 62, the rotation support shaft 63, and the first fixed input arm 68 are configured to perform a rotation operation integrally without performing a mutual operation. Therefore, the connecting rod 67 and the feed adjusting body 62 are substantially equal to the state in which they are substantially directly connected without any moving parts, and the operation can be transmitted satisfactorily. It has become.
In addition, an engaging protrusion 67 a protruding forward is provided at an intermediate position of the connecting rod 67, and the engaging protrusion 67 a is connected to a rotating end portion of the input arm 72 that rotates together with the switching lever 71. It is connected. By such a turning operation that pushes down the switching lever 71, the connecting rod 67 is moved upward, and the upper inclined surface of the cam surface 66 b of the feed adjusting table 66 comes into contact with the tip of the feed adjusting screw 65, By rotating the switch lever 71 upward, the connecting rod 67 is moved downward, and the lower inclined surface of the cam surface 66b of the feed adjusting table 66 is in contact with the tip of the feed adjusting screw 65. .

(Feed adjustment mechanism: switching solenoid)
The switching solenoid 69 is an actuator for applying a switching operation so that the feed adjusting body 62 has a predetermined target rotation angle so that a constant feed amount is obtained regardless of forward feed or reverse feed. . For example, in a sewing machine, there is a case where a very small sewing pitch is used at the start of sewing or at the end of sewing to perform condensation sewing that is less likely to cause fraying of the thread.To temporarily adjust to the sewing pitch of the condensation sewing, A switching solenoid 69 can be used. Note that the switching solenoid 69 can also be used to switch the feed pitch adjusted with the feed dial 64 to a different pitch or a reverse feed at a predetermined pitch during sewing.

FIG. 7 is a right side view of the sewing machine bed portion 21. On the bottom of the sewing machine bed portion 21 from which the bottom plate is removed, a protection column 23 having an internal configuration is suspended from the vicinity of the end portion (right end portion) on the vertical trunk portion 22 side. The column 23 is a flat plate along the X-Z plane, and the internal configuration of the sewing machine bed portion 21 avoids collision with the outside, protects the internal configuration, or the internal configuration collides with an external one or an operator. It is provided to prevent it from getting caught.
The switching solenoid 69 is attached to the plane on the left side of the column 23 by screwing. The switching solenoid 69 supports the plunger so that the advancing / retreating direction of the plunger is parallel to the XZ plane and faces a direction inclined with respect to both the X-axis direction and the Z-axis direction.
The sewing machine frame 20 is rotated by a support shaft 24 shown in FIG. 7 so that the entire frame can be tilted with respect to a bottom plate or a table on which the sewing machine is installed. By tilting in this way, the bottom of the sewing machine bed portion 21 is exposed, and maintenance work from the bottom side is possible with respect to the internal configuration of the sewing machine bed portion 21. When the sewing machine frame 20 is tilted in this way, a stopper for maintaining a predetermined rotation angle is provided. When the sewing machine frame 20 is fixed in a rotating state by the stopper, a switching solenoid is provided. The inclination angle is set so that the plunger advance / retreat direction 69 is substantially horizontal. As will be described later, the position of the switching solenoid 69 can be adjusted along the forward and backward direction of the plunger, and the switching solenoid 69 is inclined as described above, so that the sewing machine frame 20 is tilted. When performing the adjustment work, inconveniences such as accidental movement of the main body and plunger of the switching solenoid 69 caused by gravity are suppressed, and the workability of the adjustment work is improved.

The switching solenoid 69 enables the position switching described above by a long hole 23a formed in the support 23 and a set screw 73 for fixing the switching solenoid 69 to the long hole 23a. That is, three elongated holes 23a are formed in the column 23 along the plunger advancing / retreating direction when the switching solenoid 69 is attached, and the main body of the switching solenoid 69 is set by a set screw 73 through each elongated hole 23a. It is possible to fix the part (part other than the plunger).
The switching solenoid 69 is of a type that performs an operation of attracting the plunger to the deepest part when activated (when the drive current is applied). That is, by adjusting the position of the main body of the switching solenoid 69 along the plunger advance / retreat direction, the plunger stop position during operation can be arbitrarily determined. For example, as described above, when the switching solenoid 69 is used for adjusting the pitch of the condensation stitch, the rotation angle that the feed adjusting body 62 uses as the target pitch for the condensation stitching with the plunger pushed into the deepest part of the main body In this manner, the position of the main body of the switching solenoid 69 is adjusted, and fixed to the support column with each set screw 73.
With this structure, it is possible to switch to an arbitrary feed pitch by the operation of the switching solenoid 69.
In addition, as shown in FIG. 7, you may attach | subject the scale 23b used as the parameter | index of an adjustment position to the long hole 23a. Further, it is more desirable that each scale 23b be given a numerical value indicating how large the pitch is at the scale position.
The adjusted position of the switching solenoid 69 may be fixed by a stopper 74 that is fixed to the column 23 shown in FIG. As a result, the adjusted position of the switching solenoid 69 can be stably maintained.

(Description of sewing machine operation)
In the sewing machine 10 configured as described above, when the sewing machine motor starts to rotate, the upper shaft 12 is driven to rotate at a rotational speed corresponding to the rotational output of the sewing machine motor, and the needle up-and-down moving mechanism depends on the rotational speed of the upper shaft 12. Raise and lower the sewing needle.
On the other hand, the rotational driving force of the upper shaft 12 is transmitted to the vertical feed shaft 43 of the cloth feed mechanism 40 via the timing belt 13, and the vertical feed shaft 43 is rotationally driven in the same direction and at the same rotational speed as the upper shaft. The vertical feed shaft 43 vertically moves the feed base 42 and the feed dog 41 via the eccentric cam 44 and the transmission rod 45 in synchronization with the vertical movement of the sewing needle.
Further, the rotational drive force of the vertical feed shaft 43 is transmitted to the horizontal feed shaft 46 as a reciprocating rotational drive force by the eccentric rod 50. Thus, the horizontal feed shaft 46 moves the feed base 42 and the feed dog 41 forward in the feed direction in synchronization with the vertical movement of the sewing needle via the horizontal feed arm 47.
Thereby, the cloth feed mechanism 40 synthesizes and applies the driving force of the vertical movement and the forward movement along the feed direction to the feed dog 41, and as a result, the feed dog 42 moves in an oval shape. Then, the feed dog protrudes upward from the through hole 11a of the needle plate 11 when passing through the upper part of the elliptical motion locus, and the fabric pressed by the fabric retainer 19 is fed from below along the feed direction.

The cloth feed mechanism 40 is provided with a feed amount adjusting mechanism 60 capable of adjusting the feed pitch. At the time of adjustment, the feed dial 64 is rotated and the feed adjustment screw 65 is moved back and forth. As a result, the feed adjusting table 66 having the cam surface 66 b in pressure contact with the tip of the feed adjusting screw 65 rotates and simultaneously rotates the feed adjusting body 62 via the connecting rod 67. That is, the feed adjusting body 62 also rotates in accordance with the rotation operation of the feed dial 64, and adjustment is performed at an arbitrary pitch.
Further, when the forward / reverse switching of the feeding direction is executed, the switching lever 71 is rotated upward, for example. As a result, the feed adjusting screw 65 that has been in contact with the lower inclined surface of the cam surface of the feed adjusting table 66 is switched to the contact state of the upper inclined surface, and the feed adjusting body 62 exceeds the angular position where the feed amount becomes zero. Rotation is performed to switch from forward feed to reverse feed.
In addition, when switching to a predetermined pitch for execution of condensation sewing or the like, a pitch switching switch (not shown) is pressed to operate the switching solenoid 69. Thereby, the switching solenoid 69 can perform the pull-in operation of the plunger, rotate the feed adjusting body 62 to a position having a pitch determined in advance by adjusting the position of the main body, and switch to the target pitch.

(Explanation of effect of embodiment)
The sewing machine 10 connects a first fixed input arm 68 of a rotation support shaft 63 provided on the feed adjusting body 62 to a connecting rod 67 that moves up and down by a feed adjusting base 66, and feeds the feed adjusting body 62 from the feed dial 64. Since the number of parts of the motion transmitting member to be reached is greatly reduced, and the feed adjusting body 62, the turning support shaft 63, the first fixed input arm 68 and the connecting rod 67 that rotate integrally are connected, There is no movable member between them, and further, since a member for supporting the member accompanying the reduction in the number of parts can be eliminated, the influence of the processing accuracy and assembly accuracy of each member is reduced. It is possible to suppress rattling, falling down, friction, and the like. As a result, it is possible to feed with high accuracy and to improve the sewing quality. Also, the operation during sewing is stable.

  FIG. 9 is a cross-sectional view of the inside of the sewing machine 10 as viewed from the right. As shown in FIG. 9, in the sewing machine 10, a feed dial 64 and a switching lever 71 (only the shaft portion 71 a is illustrated) are arranged on the front side (operator side) of the vertical body portion 22 of the sewing machine frame 20. In the sewing machine 10, the vertical feed shaft 43 is arranged on the front side with respect to the horizontal feed shaft 46 to prevent the cloth presser 19 from jumping. All the configurations for adjusting the rotation angle range of the shaft 46 can be arranged on the rear side inside the sewing machine frame 20 in the same manner as the horizontal feed shaft 46, and the shaft portion 71 a of the feed dial 64 and the switching lever 71 can be arranged. In order to avoid this, the connecting rod 67 does not need to be curved or bent, and can be made straight. Accordingly, it is possible to improve the sewing quality and to improve the stability of the sewing operation by suppressing the backlash, the falling, the friction, and the like, and feeding with high accuracy. That is, in the sewing machine 10, a favorable feed operation is realized by the synergistic effect of the shaft arrangement of the vertical feed shaft 43 and the horizontal feed shaft 46 and the direct connection structure of the feed adjustment mechanism 60.

Further, in the sewing machine 10, the number of members that operate when the switching solenoid 69 is operated is reduced by reducing the number of members of the feed adjusting mechanism 60, thereby improving the response of the switching solenoid 69 and improving the output. Large solenoids can also be dispensed with.
Further, since the switching solenoid 69 is supported on the support column 23, a dedicated member for supporting the switching solenoid 69 is not required, and the number of parts can be reduced.
Furthermore, the configuration of the elongated hole 23a of the support post 23 and the set screw 73 allows the attachment position of the main body (coil side) of the switching solenoid 69 to be adjusted along the plunger's forward / backward direction. The switching solenoid 69 can pull the plunger to the bottom of the coil by exciting the coil, and the position of the bottom of the coil is adjusted by adjusting the position of the main body, thereby adjusting the pull-in position of the plunger. Can do. That is, by adjusting the position of the main body of the switching solenoid 69, the feed adjusting body 62 can be adjusted to stop at an arbitrary rotation angle.
In addition, since the rotation angle that is the target of the feed adjusting body is adjusted by adjusting the position of the main body of the switching solenoid 69, the plunger can always be pulled down to the bottom of the coil during operation, and the position adjustment is always stable. It can be operated with thrust.

  In addition, since the plunger advance / retreat direction of the switching solenoid 69 is attached to the support column so as to be inclined with respect to the horizontal state along the cloth feeding direction, the space has a smaller width than the case where it is horizontally arranged. It becomes possible to arrange. In particular, although it is difficult to secure the arrangement space of the solenoid 69 in which the plunger moves forward and backward, the installation space can be more easily secured by arranging the slant arrangement in this way.

DESCRIPTION OF SYMBOLS 10 Sewing machine 11 Needle plate 20 Sewing machine frame 21 Sewing machine bed part 22 Vertical trunk | drum 23 23 Support | pillar 23a Slot 40 Feed mechanism 41 Feed dog 43 Vertical feed shaft 46 Horizontal feed shaft 50 Eccentric rod (motion conversion rod)
51 Rotating arm 53 Transmission link 60 Feed adjusting mechanism 61 Operation restricting link 62 Feed adjusting body 63 Rotating support shaft 64 Feed dial 65 Feed adjusting screw (adjusting member)
66 Feed adjustment stand (cam member)
67 Connecting rod 68 First fixed input arm 69 Switching solenoid 71 Switching lever 73 Set screw

Claims (7)

A feed dog that appears and disappears from the needle plate and feeds the workpiece
A vertical feed shaft that gives a vertical reciprocating motion to the feed dog by a rotational motion;
A horizontal feed shaft that gives the feed dog a reciprocating motion in the cloth feeding direction by obtaining power from the vertical feed shaft and performing a reciprocating rotation operation;
A motion conversion rod that is provided with a circular motion at one end and performs an advancing and retreating operation for imparting reciprocating rotation to the horizontal feed shaft at the other end;
A rotating arm fixed to the horizontal feed shaft and rotating together;
A transmission link that connects the other end of the motion conversion rod and the rotation end of the input arm;
A feed mechanism comprising:
An adjustment member that moves forward and backward by rotating the feed dial;
A cam member that changes its posture by rotating when the adjusting member comes into contact with the cam surface;
In a sewing machine provided with a feed adjusting mechanism comprising one end connected to the cam member and a connecting transmission rod that moves forward and backward along its longitudinal direction.
The feed adjusting mechanism is
A motion regulating link having one end connected to the other end of the motion conversion rod;
A feed adjustment body connected to the other end of the operation restriction link and rotatably supported in the sewing machine frame;
A pivot shaft fixedly mounted on the feed adjustment body;
A fixed input arm that is fixedly mounted on the support shaft and rotates integrally;
While arranging the vertical feed shaft on the upstream side in the cloth feed direction with respect to the horizontal feed shaft,
The sewing machine is characterized in that the fixed input arm and the other end of the connection transmission rod are connected, and the angle of the feed adjusting body is adjusted by an advance / retreat operation of the connection transmission rod.   The sewing machine according to claim 1, further comprising a switching solenoid for switching the feed adjusting body to a constant rotation angle. The sewing machine is equipped with a supporting column hanging down at the end of the machine body at the bottom of the sewing machine bed,
The sewing machine according to claim 2, wherein the switching solenoid is supported by the column.   4. The sewing machine according to claim 3, wherein the switching solenoid is supported by the column so that a main body of the switching solenoid can be adjusted along a forward / backward direction of the plunger.   The sewing machine according to claim 4, wherein the switching solenoid is attached to the column so that a plunger advancing / retreating direction is inclined with respect to a horizontal state along the cloth feeding direction.   When the sewing machine frame is tilted to a predetermined tiltable position, the switching solenoid is attached to the column in such a manner that the plunger advancing / retreating direction is inclined closer to the horizontal state than the state before tilting. The sewing machine according to claim 5. The cam member is formed with a cam surface for forward feeding and a cam surface for backward feeding in an arrangement opposite to each other across the adjustment member as the cam surface,
The sewing machine according to any one of claims 1 to 6, further comprising a switching lever that switches from a state in which one of the cam surfaces is in contact with the adjusting member to a state in which the cam surface is in contact with the other cam surface.

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