JP2018007724A - Embroidery sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an embroidery sewing machine capable of easily performing adjustment of swing width for allowing a sewing needle to swing with respect to a cloth stretched across an embroidery frame, while grasping the embroidery frame with both hands.SOLUTION: An embroidery sewing machine includes: a bed part extending in the horizontal direction; a needle plate which is provided at an upper surface of the bad part, on which a cloth to be sewn is place and in which a long hole is formed in which a sewing needle for sewing passes; an arm part provided above the bed part; a needle bar provided opposing to the needle plate at the arm part and including the sewing needle at a lower end; a repetition motion device for allowing the needle bar to perform a repetition motion vertically; a swing motion device for allowing the needle bar to perform a swing motion along the long hole with swing width equal to or less than maximum allowable width; and swing width adjustment mechanism connected to the swing motion device, and for adjusting the swing width of the swing motion of the needle bar to the desired swing width equal to or less than the maximum allowable width, according to an operation amount of an operation part provided adjacent to the needle bar.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an embroidery sewing machine in which an operation unit for adjusting a swing width of a needle bar is adjacent to the needle bar.

  Traditionally, embroidery sewing machines can be freely moved to any position with respect to the sewing machine needle (free motion) to sew specific logo characters and patterns of various widths into the cloth. It is required to be able to adjust the sewing speed at which the sewing needle moves up and down, and to adjust the swing width that swings with respect to the cloth on which the sewing needle is stretched. In such an embroidery machine described in Patent Document 1 in which an embroidery machine is described, a buttonhole switch lever 24 (FIG. 1 in Patent Document 1) is arranged beside the sewing machine needle so that it can be operated by hand. The buttonhole switch lever 24 is also used as an embroidery sewing start / stop switch. The embroidery sewing start / stop switch operation can be easily performed while operating the embroidery frame with both hands.

  The sewing machine with an embroidery function in Patent Document 2 has a hand controller unit 20 connected to the sewing machine body via a harness, and the hand controller unit 20 operates the start / stop of sewing and the sewing width of the sewing needle. It has become. The hand controller unit 20 can be attached to the embroidery frame 11 and can be held by both hands of the embroidery frame 11 while operating the operation switch 23 with a fingertip or palm.

JP 2010-207542 A JP 2013-009894 A

However, in the embroidery sewing machine disclosed in Patent Document 1, the buttonhole switch lever 24 is used only to start and stop embroidery sewing, and the swing width for swinging the sewing needle with respect to the fabric stretched on the embroidery frame can be adjusted. could not.
Further, the sewing machine with an embroidery function in Patent Document 2 cannot adjust the swing width by which the sewing machine needle is swung with respect to the cloth stretched on the embroidery frame by the hand controller unit 20.

  The present invention has been made in view of the above-described problems, and easily adjusts the swing width for swinging the sewing needle with respect to the fabric stretched on the embroidery frame while holding the embroidery frame with both hands. An object of the present invention is to provide an embroidery sewing machine that can be used.

  In order to solve the above problems, the structural feature of the invention according to claim 1 is that an embroidery sewing machine is provided with a bed portion extending in a horizontal direction and a cloth provided on the upper surface of the bed portion and sewn. A needle plate in which an elongated hole through which a sewing needle to be sewn is formed, an arm portion provided above the bed portion, and the sewing needle provided at the lower end of the arm portion so as to face the needle plate A needle bar, a repetitive motion device that repetitively moves the needle bar up and down, a deflection motion device that causes the needle bar to swing along the elongated hole with a swing width of a maximum allowable width or less, and the deflection motion device A swing width adjusting mechanism that adjusts a swing width of the swing motion of the needle bar to a desired swing width that is less than or equal to a maximum allowable width according to an operation amount of an operation portion provided adjacent to the needle bar. Is provided.

  According to this, the embroidery sewing machine according to claim 1 holds the embroidery frame with both hands by operating the operation part of the swing width adjusting mechanism provided adjacent to the needle bar when performing embroidery sewing. Thus, it is possible to adjust the swing width of the swing motion of the needle bar to a desired swing width while freely moving the embroidery frame. In this way, the embroidery machine can be embroidered while adjusting the desired swing width while holding the embroidery frame with both hands, so that the embroidery frame can be freely operated to facilitate the embroidery work and can be of any width. Embroidery can be easily realized.

It is a perspective view which shows the whole embroidery sewing machine outline in an embodiment. It is a perspective view which shows the outline | summary of a deflection exercise apparatus and a swing width adjustment mechanism. It is the elements on larger scale which expand and show a shake exercise device. It is the schematic which shows a repetition speed converter with a circuit diagram and a block diagram. It is a map which shows the relationship between an output voltage and the rotational speed of a drive motor. It is a graph which shows the relationship between the operation amount of an operation lever, and the rotational speed of a drive motor. It is a graph which shows the state which shows the predetermined | prescribed rotational speed based on an instruction | indication value, without being influenced by operation of an operation lever. It is the schematic which shows the repetition rate converter of another example with a circuit diagram and a block diagram. It is a graph which shows the relationship between the operation amount of the operation lever in the repetition speed converter of another example, and the rotational speed of a drive motor.

(First embodiment)
An embodiment embodying an embroidery sewing machine having a swing adjustment lever according to the present invention will be described below with reference to the drawings. FIG. 1 shows an outline of an entire embroidery sewing machine 1 according to the present invention.
In this specification, when viewed from the front side where the user operating the embroidery sewing machine 1 is located, the left and right directions of the embroidery sewing machine 1 are the left and right directions, and the front and rear directions of the embroidery sewing machine 1 are the front and rear directions. . When the embroidery sewing machine 1 is viewed from the front side where the user is located, the user side is referred to as the front side or the front side, and the opposite side of the user is referred to as the rear side or the back side.

  The embroidery sewing machine 1 is provided with a needle plate 2a on which a cloth C to be sewn is placed, a bed portion 2 extending in the horizontal direction, and a pedestal column portion 3 extending above the right end of the bed portion 2, An arm portion 4 extending to the left side along the horizontal direction from the upper end portion of the pedestal column portion 3, and a sewing head 5 extending downward from the distal end portion of the arm portion 4 are provided. The cloth C to be sewn is stretched on the embroidery frame CF.

  The pedestal part 3 includes a drive motor 31 fixed to the machine casing 13. For example, an AC servo motor is used as the drive motor 31. The arm portion 4 is provided with an upper shaft 41 that is connected to the drive motor 31 on the right end side and extends in the horizontal direction. A hand wheel 41a for rotating the upper shaft 41 is provided at the right end of the upper shaft 41 when the user finely adjusts the position of the needle bar 51 or the like. The bed portion 2 is provided with a lower shaft 21 that is connected to the drive motor 31 on the right end side and extends in the horizontal direction. Further, the sewing machine head 5 includes a needle bar 51 to which a sewing needle 53 is attached and which can be moved up and down, and a presser bar (not shown) for holding a cloth presser (not shown). The needle plate 2a is provided with a long hole 2b having a predetermined width and a longitudinal portion extending in the left-right direction. The elongate hole 2b passes through the sewing needle 53 and intersects the hook portion (not shown). The width of the longitudinal portion of the long hole 2b is such that when the sewing needle 53 is swung in the left-right direction within the swing width swung for embroidery sewing, the sewing needle 53 is placed on the needle plate 2a (the edge of the long hole 2b). It is configured not to touch. The maximum allowable width of the deflection movement of the needle bar 51 is such that the sewing needle 53 crosses the hook portion (not shown) and causes the lower thread (not shown) and the upper thread (not shown) to be locked with each other. It is set within the range. The width in the longitudinal direction of the long hole 26 is also set according to the maximum allowable width. The upper shaft 41 and the lower shaft 21 are configured to rotate in synchronization by an unshown endless belt and pulley provided between the drive motor 31 and the upper shaft 41.

  The embroidery sewing machine 1 includes a repetitive motion device 6, a swing motion device 7, a swing width adjusting mechanism 8, and the like. In addition, a first volume 9 as a first repetition speed changing device to be described later is provided inside the arm portion 4. On the front surface of the arm unit 4, a changeover switch for selecting the second volume 10, the first volume 9, and the second volume 10 as the second repetition speed changing device and changing the repetition speed based on one output. 11 (seesaw switch).

(Repetitive motion device)
The repetitive motion device 6 is provided at the left end of the upper shaft 41 and includes a needle bar crank (not shown) and a crank rod (not shown). The upper shaft 41 is rotated by the drive of the drive motor 31, and the rotational motion of the upper shaft 41 is converted into the vertical reciprocating motion of the crank rod by the needle bar crank. The vertical reciprocating motion of the crank rod is transmitted to the needle bar 51 and causes the needle bar 51 to repeatedly move in the vertical direction. Since this needle bar crank is a known technique, description thereof is omitted. As the needle bar crank, for example, a needle bar crank described in JP 2012-19976 A can be used. The needle bar 51 is held by a needle bar guide 63 extending in the vertical direction so as to be movable up and down. A needle clamp 52 is provided at the lower end of the needle bar 51, and a sewing needle 53 is attached to the needle clamp 52. An upper end portion of the needle bar guide 63 is pivotally supported by an upper support shaft 63a fixed to the machine frame 13, and the needle bar guide 63 is configured to swing in an arc shape in a vertical plane in the left-right direction.

(Swing exercise device)
The swing motion device 7 includes a pattern cam 71, a crank claw 72, an amplification arm 73, a swing member 74, and an operating arm 75. The swinging motion device 7 causes the needle bar 51 to swing along the long hole 2b with a swinging width W equal to or less than the maximum allowable width. The pattern cam 71 is formed of a disk-shaped member having a regular uneven surface 71a on the outer periphery. The pattern cam 71 is configured such that the drive of the drive motor 31 is transmitted by a gear mechanism (not shown) and rotates in synchronization with the rotation of the upper shaft 41 around a rotation shaft 71b fixed to the machine frame 13. . The crank pawl 72 is formed, for example, from an iron member in a substantially inverted L shape, and is rotatable about a rotation shaft 72a provided at a central corner. One end 72 b of the crank claw 72 can come into contact with the uneven surface 71 a of the pattern cam 71. An engaging groove 72c having an open end is formed at the other end. The crank pawl 72 is urged by a coil spring 72d disposed around the rotation shaft 72a in a direction in which one end 72b contacts the outer periphery of the pattern cam 71 (clockwise in FIGS. 2 and 3). Yes. A front end protrusion 73b of a branch arm 73a provided integrally with the amplification arm 73 is rotatably engaged with the engagement groove 72c.

  The amplification arm 73 is formed in a thin plate shape from an iron member, for example, and extends in the vertical direction. A base end portion of the amplification arm 73 is rotatably supported by a rotation support shaft 73c provided in parallel with the rotation shaft 71b of the pattern cam 71. A curved portion 73d that is gently curved is formed at the tip of the amplification arm 73, and an engagement shaft 74a of the swing member 74 is slidably engaged with the curved portion 73d (see FIG. 3).

  The swing member 74 is formed of, for example, an iron member in a rectangular shape, and includes a fixed engagement portion 74c and a slide engagement portion 74d with a partition wall 74b (a rectangular wall parallel to the paper surface in FIG. 3) as a boundary. (See FIG. 2). The fixed engagement portion 74c is provided with a swing center shaft 74c1 having an axial center disposed in the front-rear direction on the swing member 74 (see FIG. 3). The swing center shaft 74c1 is fixed to the machine frame 13. It is fixed to the fixed bar 74c2. The swing member 74 is rotatable about the swing center shaft 74c1. The fixed engagement portion 74c is integrally provided with an engagement shaft 74a standing upright in a direction perpendicular to the partition wall 74b. The sliding engagement portion 74d is provided with a sliding groove 74d1 substantially parallel to one side in the vertical direction of the swing member 74. A disk-like slider shaft 75a provided at the right end of the operating arm 75 is slidably engaged with the sliding groove 74d1. The slider shaft 75a slides along the sliding groove 74d1, and a greater swing is transmitted to the operating arm 75 as the slider shaft 75a moves away from the swing center shaft 74c1. Conversely, when the swing center shaft 74c1 and the slider shaft 75a approach each other and become coaxial, the swing transmitted from the swing member 74 to the operating arm 75 becomes zero. The swing member 74 is urged clockwise (in FIGS. 2 and 3) by a spring member 74e whose left end is fixed to the machine frame 13, and the engagement shaft 74a is engaged with the curved portion 73d at the tip of the amplification arm 73. The engagement is maintained.

  The actuating arm 75 is, for example, a thin plate-like bar member formed of an iron member and extending in the left-right direction, and the left end portion is rotatably connected to the right lower end portion of the needle bar guide 63 by a support connecting shaft 75b. Has been. The operating arm 75 is connected to the link member 85 of the swing width adjusting mechanism 8 in the center portion on the rear side inside the arm portion 4, and the needle bar 51 and the pattern cam located on the center side of the arm portion 4 at the left and right ends. 71 is formed to be bent forward so as to face 71. The operating arm 75 is urged obliquely downward toward the needle bar 51 by a spring member 75d having a left end fixed to the machine frame 13 in the vicinity of the right bent portion 75c.

(Swing width adjustment mechanism)
The swing width adjusting mechanism 8 includes an operation lever 81 (operation unit), a horizontal arm 82, a bell crank 83, a holding bracket 84, and a link member 85. The swing width adjusting mechanism 8 adjusts the swing width of the needle bar 51 generated in the swing motion device 7 to a desired swing width W that is equal to or less than the maximum allowable width according to the operation amount in the swing width adjusting mechanism 8.
The operation lever 81 is a thin plate-like member made of, for example, an iron member, and is provided to extend in the vertical direction adjacent to the needle bar 51, and is provided with a hand pressing portion 81a having a flat surface at the lower end portion. ing. An upper end portion of the operation lever 81 is connected to an upper connecting shaft 81 b having a rotation axis in the front-rear direction at the left end portion of the horizontal arm 82, and is relatively rotatable with the horizontal arm 82. A central portion of the operation lever 81 is connected to a first connecting shaft 84 a having a rotational axis in the front-rear direction at a lower left end portion of a holding bracket 84 (described later) fixed to the machine casing 13. The operation lever 81 is rotatable around the first connecting shaft 84a of the holding bracket 84 in an imaginary vertical plane extending in the left-right direction. The upper portion of the operation lever 81 is urged to the left by a spring member 81c whose left end is fixed to the machine casing 13. When the operation lever 81 is urged to the leftmost side by the spring member 81 c, the operation lever 81 is locked to a first stopper portion 84 b (described later) provided at the left end portion of the holding bracket 84. As described above, the operating lever 81 is positioned by the spring member 81c and the first stopper portion 84b at a position where the hand pressing portion 81a is tilted to the rightmost side when the user does not operate.

The holding bracket 84 is, for example, an iron plate-like member and is formed in an inverted L shape. The L-shaped longitudinal portion 84c in the left-right direction extends in the horizontal direction and is fixed to the machine frame 13 by two screws 84d. The left end is provided with a protruding portion 84e at a position facing the longitudinal portion 84c, and the protruding portion 84e is bent forward to form a first stopper portion 84b. A rotation center portion 83a of a bell crank 83, which will be described later, is rotatably connected to the right end portion of the holding bracket 84 by a second connecting shaft 84f. As described above, the operating lever 81 is rotatably connected to the lower end portion of the vertical member 84h extending downward on the left side of the holding bracket 84 by the first connecting shaft 84a.
The holding bracket 84 includes a second stopper portion 84j that temporarily stops the operation lever 81 so as to pass therethrough. The second stopper portion 84j is a hard resin member, for example, and is formed of a convex member having a thin thickness in the front-rear direction. In the holding bracket 84, the second stopper portion 84j is fixed at a position corresponding to a position where the hand pressing portion 81a is tilted slightly to the left side from the rightmost end portion. The second stopper portion 84j can be passed while the rear surface of the operation lever 81 is in contact with the second stopper portion 84j. When the operation lever 81 passes, the second stopper portion 84j is configured such that the left side end surface of the operation lever 81 contacts the second stopper portion 84j and can be temporarily stopped.
When the operation lever 81 is moved from the first stopper portion 84b and positioned at the second stopper portion 84j, a switch of a circuit (not shown) is connected. Then, embroidery sewing can be started, and for example, the feed dog (not shown) is moved downward from the upper surface of the needle plate 2a by a drop feed mechanism (not shown). Further, in the deflection motion device 7, the pattern cam 71 is connected via the upper shaft 41 and a reduction gear (not shown), and the rotation of the pattern cam 71 is started.
When the operation lever 81 is positioned on the first stopper portion 84b, the embroidery sewing is stopped, for example, the feed dog (not shown) is moved above the upper surface of the needle plate 2a by a drop feed mechanism (not shown), The feed dog movement mechanism (not shown) becomes operable. Also, the pattern cam 71 stops rotating. Thus, the operation lever 81 is also used as a start / stop switch for embroidery sewing. The circuit provided with the embroidery sewing start / stop switch is a known technique and will not be described.

  The horizontal arm 82 is formed, for example, from a steel member into a plate-like bar shape, and is arranged above the holding bracket 84 in line with the longitudinal portion 84 c. As described above, the left end portion of the horizontal arm 82 is rotatably connected to the upper end portion of the operation lever 81 by the upper connecting shaft 81b. The right end of the horizontal arm 82 is rotatably connected to the left end of the bell crank 83 by an upper right connecting shaft 82a. An engaging recess 82b that opens downward is formed in the central portion of the horizontal arm 82. The engagement recess 82b is provided to engage with the engagement operation portion 9a of the first volume 9 fixed to the machine frame 13 so that the engagement operation portion 9a can be moved in the left-right direction. The horizontal arm 82 is urged to the left side by the spring member 81c and is positioned to the leftmost side (in this case, a position locked by the first stopper portion 84b and a position stopped by the second stopper portion 84j). In other words, the instruction value by the engagement operation portion 9a of the first volume 9 is set to the minimum value.

  The bell crank 83 is, for example, a plate-like member formed from an iron member in an L shape, and the left end is rotatably connected to the right end of the horizontal arm 82 by the upper right connecting shaft 82a as described above. . The right end portion of the bell crank 83 is rotatably connected to the upper end portion of the link member 85 by an upper link connecting shaft 85a. The bell crank 83 has a central rotation center portion 83a rotatably connected to the right end portion of the holding bracket 84 by a second connecting shaft 84f. The link member 85 has a lower end portion rotatably connected to a central portion of the operating arm 75 by a lower link connecting shaft 85b.

  When the user operates the hand pressing portion 81a of the operation lever 81 to the left side, the horizontal arm 82 connected to the upper end portion of the operation lever 81 moves to the right side. When the horizontal arm 82 moves to the right side, the bell crank 83 connected to the right end of the horizontal arm 82 rotates clockwise. When the bell crank 83 rotates clockwise, the operating arm 75 moves downward via the link member 85. The operating arm 75 moves the slider shaft 75a at the right end of the operating arm 75 downward along the sliding groove 74d1 of the swinging member 74, with the support connecting shaft 75b connected to the needle bar guide 63 as the rotation center. . When the slider shaft 75a is moved downward, the slider shaft 75a is separated from the swing center shaft 74c1, so that the swing radius for swinging the operating arm 75 in the left-right direction is increased. Thus, by operating the hand pressing portion 81a of the operation lever 81 to the left side, the swing of the operating arm 75 is increased, and the desired swing width W of the needle bar 51 is increased.

  Since the horizontal arm 82 is moved to the right side when the hand pressing portion 81a of the operation lever 81 is operated to the left side, the first volume 9 is simultaneously increased with the increase of the desired swing width W of the needle bar 51 by the movement of the engagement recess 82b. The engagement operation portion 9a can be moved to the right side.

(First volume (first iteration speed change device))
For example, as shown in FIG. 4, the first volume 9 (first repetition speed changing device) is a circuit on the left side provided with a variable resistor 91, which transforms an input voltage (Vx2 in this circuit) to Vx1. Output as. The first volume 9 increases and outputs Vx1 according to the increase amount of the desired swing width W by the operation lever 81 of the swing width adjusting mechanism 8. This increase in Vx1 is an increase in repetition rate as will be described later.
Transformation by the variable resistor 91 occurs when the contact position of the contact terminal 95 is moved by the operation of the engagement operation portion 9a. When the variable resistor 91 generates a resistance corresponding to the length, when the total length of the variable resistor 91 is Lo and the length between the lower end of the variable resistor 91 and the contact terminal is Lx, the first volume 9 is A voltage (Vx1) corresponding to the ratio of Lx / Lo with respect to the input voltage (Vx2) is output between the output terminal 9p and the output terminal 9m.
The operation lever 81 also serves as an embroidery sewing start / stop switch. When the operating lever 81 is moved to the left side from the stop position by the first stopper portion 84b set at the rightmost end of the hand pressing portion 81a to the second stopper portion 84j position, embroidery sewing can be started. For example, the feed dog (not shown) is moved downward from the upper surface of the needle plate 2a by the drop feed mechanism.

As shown in FIG. 5, the instruction value (rotation speed of the drive motor 31) instructed by the engagement operation unit 9 a and the voltage Vx1 are formed in advance as a map and stored in a speed command unit (microcomputer) 92. Has been. The speed command unit 92 as a microcomputer includes a central processing unit (CPU), a program memory (ROM), a data memory (RAM), an A / D conversion device, etc. (not shown). Then, the command from the speed command unit 92 is input to the drive circuit (driver 93) as shown in FIG. The driver 93 controls the drive current to output the rotation speed required for the motor (drive motor 31). The rotational speed of the drive motor 31 is detected by the encoder 94 and fed back to the driver 93 to control the rotational speed to a desired rotational speed.
Here, the “repetitive speed” described in the claims is a speed at which the needle bar 51 moves up and down. Generally, the “sewing speed” that indicates how many times the sewing needle 53 has passed through the cloth C to be sewn every minute. (Needle / minute) ". As for the sewing speed (repetitive speed), the rotational speed of the drive motor 31 is transmitted to the rotation of the upper shaft 41, and the rotational motion of the upper shaft 41 is converted into vertical motion by the repetitive motion device 6. The rotational speed of the drive motor 31 always corresponds to the repetition speed. Therefore, in the present embodiment, “the rotational speed (N / S) of the drive motor 31” is described as the target output value to be controlled as the repetition speed.

(Second volume (second repetitive speed change device), changeover switch)
The second volume 10 indicates the rotational speed of the drive motor 31 as an instruction value (for example, 5a, 5b, 5c) by sliding in the left-right direction on the front surface of the arm unit 4 (see FIGS. 6 and 7). . The second volume 10 operates independently of the swing width adjusting mechanism 8. As shown in FIG. 4, the second volume 10 has, for example, a variable resistor 10a, transforms the input voltage Vo, and outputs an output voltage Vx2 between the output terminal 10p and the output terminal 10m.

  Further, as shown in FIG. 4, the changeover switch 11 switches the connection terminal 11a between the A terminal at the A position and the B terminal at the B position for connection. At the A position, the output from the second volume 10 is not connected to the first volume 9 side. Therefore, when the connection terminal 11a is connected to the A terminal, the voltage Vx2 output from the second volume 10 is output to the speed command unit 92. In other words, the indication value of the second volume 10 reflects the reflected voltage Vx2. The speed command unit 92 converts the input voltage into a rotation speed of the drive motor 31, and the speed command unit 92 outputs a desired rotation speed to the driver 93. The driver 93 controls the drive current to output the rotation speed required for the drive motor 31 (this rotation speed is determined by the indication values (5a, 5b, 5c) of the second volume 10 as described above, It is reflected as it is (FIG. 7)). The rotational speed of the drive motor 31 is detected by the encoder 94, fed back to the driver 93, and controlled so that the rotational speed is maintained at a desired rotational speed. When the connection terminal 11a of the changeover switch 11 is connected to the A terminal, the operation lever 81 functions only as an embroidery start / stop switch.

  When the connection terminal 11 a is connected to the B terminal, the output from the second volume 10 is connected to the first volume 9. Therefore, the voltage Vx2 output from the second volume 10 is further transformed by the first volume 9 and output as the voltage Vx1. The first volume 9 is transformed and output as the voltage Vx1 as described in the first volume 9. In this case, the voltage Vx2 output from the second volume 10 is the maximum value of the voltage Vx1 that is transformed by the first volume 9 and output. Since the maximum value of the rotational speed of the drive motor 31 is also determined corresponding to the maximum value of this voltage, the value based on the indication value (for example, 5a, 5b, 5c) of the second volume 10 is the rotational speed of the drive motor 31. (See FIG. 6).

  In the present embodiment, when the connection terminal 11a of the changeover switch 11 is connected to the B terminal, the maximum value of the rotation speed of the drive motor 31 can be changed based on the second volume 10 in addition to the output of the first volume 9. However, the present invention is not limited to this. For example, as shown in the equivalent circuit of FIG. 8, only the first volume 9 may be selected, and the input voltage Va (Vx2) may be constant and the maximum value of the rotation speed of the drive motor 31 may not be changed. In this case, operating the operating lever 81 to the left increases the rotational speed of the drive motor 31 (FIG. 9).

(Feed dog movement mechanism, etc.)
When performing embroidery sewing with the embroidery frame CF in hand, a feed dog (not shown) that feeds the cloth C to be sewn in a predetermined direction and a feed dog movement mechanism (not shown) can freely operate the embroidery frame CF. Inhibits. Therefore, the feed dog is moved downward by the drop feed mechanism below the upper surface of the needle plate 2a. Since the drop feed mechanism is a known technique, description thereof is omitted. Examples of the drop feed mechanism include those described in JP-A-10-33861.
Further, since the feed dog and the feed dog movement mechanism are also known techniques, the description thereof is omitted. Examples of the feed dog and the feed dog movement mechanism include a feed dog and a feed dog movement mechanism described in JP2013-172A.

The embroidery sewing machine 1 configured as described above is embroidered according to the following procedure based on FIGS. 1 and 4 to 7.
When the user performs embroidery at a predetermined speed regardless of the desired swing width W of the needle bar 51 that responds to the operation lever 81, the user sets the sewing switch (the rotational speed of the drive motor 31) to the switch 11 Position to position (connect to A terminal). In this case, the instruction value (for example, 5a, 5b, 5c) of the second volume 10 is output as it is as the sewing speed (see FIG. 7). This is effective when the user wants to embroidery at a constant sewing speed, for example. In this case, the operation lever 81 functions only as an embroidery sewing start / stop switch.

When the user increases embroidery by increasing the sewing speed (the rotational speed of the drive motor 31) in accordance with an increase in the desired swing width W of the needle bar 51 in response to the operation lever 81, the changeover switch 11 is set to B Position to position (connect to B terminal). In this case, the operating lever 81 is operated from the stop position by the first stopper portion 84b to the left side, and when the second stop portion 84j is exceeded, the shake motion device 7 starts driving. When the hand pressing portion 81a of the operation lever 81 is further moved to the left side, the horizontal arm 82 connected to the upper end portion of the operation lever 81 is moved to the right side as shown in FIG.
When the horizontal arm 82 moves to the right side, the bell crank 83 connected to the right end of the horizontal arm 82 rotates clockwise. When the bell crank 83 rotates clockwise, the operating arm 75 moves downward via the link member 85.
The operating arm 75 moves the slider shaft 75a at the right end of the operating arm 75 downward along the sliding groove 74d1 of the swinging member 74, with the support connecting shaft 75b connected to the needle bar guide 63 as the rotation center. . When the slider shaft 75a is moved downward, the slider shaft 75a is separated from the swing center shaft 74c1, so that the swing radius for swinging the operating arm 75 in the left-right direction is increased.
Thus, by moving the hand pressing portion 81a of the operation lever 81 to the left side, the swing of the operating arm 75 is increased and the swing width W of the needle bar 51 is increased.

  In conjunction with the operation of the operation lever 81, the engagement operation portion 9a of the first volume 9 is operated. As a result, the first volume 9 transforms the voltage Vx2 output from the second volume 10 with the variable resistor 91 and outputs the voltage Vx1 as shown in FIG.

At the start, when the engagement operation portion 9a is positioned at the leftmost end portion, the contact terminal 95 is positioned at the lowermost end portion of the variable resistor 91 in FIG. When the engagement operation portion 9a is operated to the right side in conjunction with the operation lever 81, the contact terminal 95 is moved upward in FIG.
When the contact terminal 95 is moved upward, the voltage between the output terminal 9p and the output terminal 9m output from the variable resistor 91 changes so as to increase in accordance with the ratio of Lx / Lo in FIG. The terminal 95 outputs a larger voltage Vx1 than when it is positioned below. (However, when the voltage is transformed, the output voltage Vx1 is reduced with respect to the input voltage Vx2.) As a result, the rotational speed of the drive motor 31 is increased.
The input voltage of the first volume 9 is the voltage Vx2 output from the second volume 10. In this case, the voltage Vx2 output from the second volume 10 is output after the constant input voltage Vo is reduced by the variable resistor 10a in the same manner as the variable resistor 91. Thus, the input voltage of the first volume 9 is the voltage Vx2 output from the second volume 10, and is the maximum value of the voltage Vx1 output from the first volume 9. Therefore, the maximum value of the rotational speed of the drive motor 31 corresponding to the voltage Vx1 can be set as shown in FIG. 6 by the instruction values 5a to 5c of the second volume 10, for example.
In this way, when the changeover switch 11 is positioned at the B position, the user sets the desired swing width W of the needle bar 51 and the rotation speed (sewing speed / repetition speed) of the drive motor 31 to the swing width adjusting mechanism 8. The cloth C can be embroidered by increasing or decreasing it by operating the operation lever 81. In the cloth C to be sewn, for example, when the area to be embroidered by the user is larger than the maximum allowable width of the needle bar 51, the desired swing width W of the needle bar 51 and the rotational speed of the drive motor 31 are set. By increasing both, the user can efficiently perform the embroidery work. Further, when the embroidery area is small and fine embroidery is performed, the user can reduce the desired swing width W of the needle bar 51 and the rotational speed of the drive motor 31 to perform the embroidery work carefully and reliably. it can.
When stopping the embroidery sewing, the user operates the operation lever 81 to move it to the stop position by the first stopper portion 84b. As a result, the embroidery stitching is stopped, and the feed dog can protrude to the upper surface of the needle plate 2a by the drop feed mechanism. Further, the rotation of the pattern cam 71 is stopped.

  As is apparent from the above description, in the embroidery sewing machine 1 of the present embodiment, the bed 2 that extends in the horizontal direction and the sewing needle that is placed and sewn on the upper surface of the bed 2 that is sewn is placed. The needle plate 2a in which the long hole 2b through which the 53 passes is formed, the arm portion 4 provided above the bed portion 2, and the sewing needle 53 provided on the arm portion 4 so as to face the needle plate 2a are provided at the lower end. A needle bar 51, a repetitive motion device 6 that causes the needle bar 51 to repetitively move up and down, a deflection motion device 7 that causes the needle bar 51 to swing along the long hole 2b with a swing width that is less than or equal to the maximum allowable width, and a swing A swing width that is connected to the exercise device 7 and adjusts the swing width of the swing motion of the needle bar 51 to a desired swing width W that is less than or equal to the maximum allowable width in accordance with the amount of operation of the operation lever 81 provided adjacent to the needle bar 51. An adjustment mechanism 8.

  According to this, the embroidery sewing machine 1 holds the embroidery frame CF with both hands by operating the operation lever 81 of the swing adjustment mechanism 8 provided adjacent to the needle bar 51 when performing embroidery sewing. Thus, the swing width of the swing motion of the needle bar 51 can be adjusted to the desired swing width W while freely moving the embroidery frame CF. As described above, the embroidery frame CF can be moved while adjusting the desired swing width W while the embroidery frame CF is held with both hands, so that the embroidery frame CF can be moved to facilitate the embroidery work, and embroidery can be easily performed with the desired swing width W. Can be realized.

  The embroidery sewing machine 1 includes a first volume 9 that is connected to the repetitive motion device 6 and changes the repetitive speed of the repetitive motion of the needle bar 51. The first volume 9 is connected to the swing width adjusting mechanism 8, and The repetition speed of the needle bar 51 (the rotational speed of the drive motor 31) is increased based on the output of the first volume 9 corresponding to the increase amount of the desired swing width W adjusted by the adjusting mechanism 8.

  According to this, by operating the operation lever 81 of the swing width adjusting mechanism 8, the repetition speed of the needle bar 51 (the rotation of the drive motor 31) according to the increase amount of the desired swing width W adjusted by the swing width adjusting mechanism 8. Speed) can be increased. As described above, the embroidery sewing machine 1 operates the operating lever 81 of the swing width adjusting mechanism 8 while holding the embroidery frame CF with both hands, thereby adjusting the repetition speed of the needle bar 51 while adjusting the desired swing width W. It is also possible to increase the (rotational speed of the drive motor 31). For this reason, an extremely efficient embroidery operation can be performed especially when a large area exceeding the maximum allowable width of the swinging width is reciprocated many times.

  The embroidery sewing machine 1 is further provided with a second volume 10 that is connected to the repetitive motion device 6 and changes the repetitive speed of the needle bar 51 (the rotational speed of the drive motor 31). The adjusting mechanism 8 is operated independently and can change the repetitive speed of the needle bar 51 (corresponding to the rotational speed of the drive motor 31) based on the output of the second volume 10, and the first volume 9 and the second volume 10 Is further provided with a change-over switch 11 that selects one of the volumes 9 and 10 and changes the repetition speed of the needle bar 51 (the rotational speed of the drive motor 31) based on the output of the selected one of the volumes 9 and 10.

According to this, the embroidery sewing machine 1 can select one of the first volume 9 and the second volume 10 by the changeover switch 11. When the embroidery sewing machine 1 selects the first volume 9 and operates the operation lever 81 of the swing width adjusting mechanism 8 provided adjacent to the needle bar 51, the desired swing width W adjusted by the swing width adjusting mechanism 8 is set. The repetition speed of the needle bar 51 (the rotational speed of the drive motor 31) can be increased according to the increase amount of the needle bar 51. When the second volume 10 is selected, the repetition speed of the needle bar 51 can be changed independently of the swing width adjusting mechanism 8.
Thus, the embroidery sewing machine 1 can be easily switched to a mode that is easy for the operator to use by the changeover switch 11.

In the present embodiment, the first repetition speed changing device (first volume 9) and the second repetition speed changing device (second volume 10) are configured by an electric circuit having a variable resistance, and Although the rotational speed of the drive motor 31 was controlled based on the voltage Vx1 output from the output terminals 9p and 9m, it is not limited to this. For example, based on the signals individually output from the first volume, the second volume, and the changeover switch, the rotation speed of the drive motor is calculated by a microcomputer, and the drive motor is controlled by current control of the desired rotation speed by a driver. May be output.
The operation lever 81 is also used as an embroidery sewing start / stop switch. However, the present invention is not limited to this, and for example, an embroidery sewing start / stop switch may be provided as a dedicated switch.
The changeover switch 11 is a seesaw switch that connects the connection terminal to one of the A terminal and the B terminal, but is not limited thereto, and may be, for example, a slide switch or a push button switch.
In addition, the engagement operation portion 9a for operating the first volume 9 is operated by being engaged with the horizontal arm 82 of the swing adjustment mechanism 8. However, the present invention is not limited to this. For example, the operation lever 81 or the bell The crank 83 may be engaged.

  The present invention is not limited to the embodiment described above and shown in the drawings, and can be implemented with appropriate modifications within a range not departing from the gist.

  DESCRIPTION OF SYMBOLS 1 ... Embroidery sewing machine, 2 ... Bed part, 2a ... Needle plate, 2b ... Long hole, 4 ... Arm part, 5 ... Sewing head, 51 ... Needle bar, 53 ... Sewing needle, 6 ... Repetitive motion device, 7 ... Swing motion device, 8 ... Swing width adjustment mechanism, 81 ... Operation lever (operation part), 9 ... First volume ( (First repeat speed changing device), 10 ... second volume (second repeat speed changing device), 11 ... changeover switch, C ... cloth to be sewn, CF ... embroidery frame, W ... -Swing width (desired swing width).

Claims (3)

A bed portion extending in a horizontal direction;
A needle plate on which an elongate hole is formed, through which a sewing needle placed and sewed is placed and sewn on the upper surface of the bed portion;
An arm portion provided above the bed portion;
A needle bar provided on the arm portion so as to face the needle plate and having the sewing needle at a lower end;
A repetitive motion device for repetitively moving the needle bar up and down;
A swing motion device that swings the needle bar along the elongated hole with a swing width of a maximum allowable width or less;
A swing width that is connected to the swing motion device and adjusts the swing width of the swing motion of the needle bar to a desired swing width that is less than or equal to a maximum allowable width in accordance with an operation amount of an operation unit provided adjacent to the needle bar. An embroidery sewing machine comprising an adjustment mechanism. A first repetitive speed changing device connected to the repetitive motion device for changing a repetitive speed of the repetitive motion of the needle bar;
The first repetitive speed changing device is connected to the swing width adjusting mechanism, and the needle bar is based on an output of the first repetitive speed changing device according to an increase amount of the desired swing width adjusted by the swing width adjusting mechanism. The embroidery sewing machine according to claim 1, wherein the repetition speed is increased. A second repetitive speed changing device connected to the repetitive motion device for changing the repetitive speed of the repetitive motion of the needle bar;
The second repetition speed changing device is operated independently of the amplitude adjustment mechanism, and can change the repetition speed of the needle bar based on an output of the second repetition speed changing device.
One repetition speed change device of the first repetition speed change device and the second repetition speed change device is selected, and the repetition speed of the needle bar is determined based on the output of the selected one repetition speed change device. The embroidery sewing machine according to claim 2, further comprising a changeover switch to be changed.

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