JP6064328B2 - sewing machine - Google Patents

Description

  The present invention relates to a sewing machine.

  As a conventional sewing machine, in order to change the sewing characteristics, the foot pedal (foot controller) has a tread plate that can be displaced by the operator's stepping action, and a resistance value that determines the motor speed of the sewing machine according to the stepping amount of this tread plate. Two variable resistors that have different characteristics in the relationship between the amount of depression of the tread board and the resistance value, that is, the relationship between the tread amount of the tread board and the sewing speed (sewing characteristics), and either of these two variable resistances alone, or , Switching means that enables both to be connected in parallel to the control device of the sewing machine, and the switching means can select one type close to the necessary sewing characteristics from the three types of sewing characteristics prepared in advance. There are some (for example, refer to Patent Document 1).

  In addition, in order to change the sewing characteristics, a foot-operated controller (foot controller) has a treadle that can be displaced by the operator's stepping action, a controller slide base that supports the treadle so that it can be displaced, and a variable resistance operation that detects the amount of tread on the treadle. The mechanism, the controller base that pivotally supports the controller slide base, the rotary variable resistor that changes the resistance value according to the amount of displacement of the tread, and the rotation position of the controller slide base is detected to detect the resistance value And a switching means comprising a detecting means for changing the upper limit value or the lower limit value, and the switching means is selected from three types of relations (sewing characteristics) between the amount of stepping on the tread plate and the number of rotations of the sewing machine motor. There is one that can select one type close to the necessary sewing characteristics (for example, see Patent Document 2).

JP 2008-245728 A JP 2009-089729 A

  However, in the sewing machine disclosed in Patent Document 1, even if the operator wants to adjust the sewing characteristics according to various sewing items, it is necessary to select from among those prepared in advance. There is a problem that it cannot be done.

  Further, the sewing machine disclosed in Patent Document 2 has a problem that it is necessary to bend the ankle in an unfamiliar lateral direction in addition to the same problem as the sewing machine disclosed in Patent Document 1.

  The present invention has been made in view of the above problems, and an operator can select and use necessary sewing characteristics according to various sewing items from sewing characteristics prepared continuously in advance. An object of the present invention is to provide a sewing machine that does not require the ankle to bend in an unfamiliar lateral direction.

A first problem-solving means of the present invention is a step-down casing having a base casing in contact with a floor surface, and a press-fitting engagement portion to the rotation shaft that is rotatable via a rotation shaft formed on the base casing. A variable resistor that adjusts a resistance value according to a stepping amount of the stepping casing, a pedestal having a holding portion for the variable resistance, and a direction in which a user goes the pedestal perpendicularly to the rotation shaft on the base casing A movement device capable of continuously changing the maximum depression angle of the depression casing by moving to a foot controller, and a motor that adjusts the sewing speed according to the resistance value of the variable resistance, The base casing is orthogonal to the rotating shaft on the base casing via a first bearing and a second bearing that are integrally formed with the base casing. A male screw installed in a direction is rotatably engaged, and an adjustment dial for rotating a part of the male screw in the rotation direction of the male screw shaft is integrally formed with the male screw. The pedestal is engaged with the male screw so as to be movable on the male screw by rotation of the male screw, and the variable resistance operating lever is placed on the pedestal when the stepping casing is stepped on. the are installed depresses depression amount transmission rod, wherein the maximum depression observed angle of the foot controller,
In a state where there is no stepping force on the stepping casing, an angle between a straight line connecting the center of the rotating shaft and the upper surface of the pedestal and a straight line connecting the center of the rotating shaft and the tip of the stepping amount transmission rod. There is a sewing machine.

According to a second means for solving the problem of the present invention , a transparent resin is used for the base casing, and the stepping amount transmission rod is moved between the foremost part and the rearmost part of the male screw on the male screw via the pedestal. A scale indicating the amount of movement of the pedestal is integrally formed in the movement range of the pedestal .

According to the first problem solving means, the sewing machine of the present invention includes a pedestal that holds a variable resistance and a moving device that changes the maximum stepping angle of the foot controller by moving the pedestal, so that various sewing products can be used. Accordingly, the relationship between the depression angle of the tread board and the sewing speed (sewing characteristics) can be selected from the continuous sewing characteristics prepared in advance and used. In addition, by having a moving device, the operating direction of the foot controller is one direction of the stepping direction with one moving device that operates the variable resistance, so there is no need to bend the ankle in an unfamiliar lateral direction. Can be made. Furthermore, since the sewing machine of the present invention is configured by the external thread and the adjustment dial, the sewing characteristics can be easily selected and used simply by turning the adjustment dial.

According to the second problem-solving means, the sewing machine according to the present invention is designed to sew a polyester fabric or a wool fabric having characteristics between a satin fabric and a wool fabric, and then step on the pedestal to transmit the front and rear portions of the transmission amount rod. In accordance with the operator's needs, the stepping amount transmission rod can be stepped to the required position (maximum stepping angle of the stepping casing) between about 14 ° and about 10 °. When selecting freely, it becomes possible to make it easy for an operator to memorize the scale position according to the cloth.

Perspective view of sewing machine Upper external perspective view of foot controller Bottom external perspective view of foot controller Cross section of foot controller Illustration of mobile device

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view of a sewing machine 1 according to the present invention. The sewing machine 1 is placed on the table 8, the foot controller 10 is placed on the floor 9, and the sewing machine 1 and the foot controller 10 are electrically connected by the harness 2. The sewing machine 1 includes a motor 6 and a substrate 5. The substrate 5 is electrically connected to the harness 2 via the connector 3 (see FIG. 2) and the motor 6 via the internal electric wire 7.

  FIG. 2 is an upper external perspective view of the foot controller 10. The foot controller 10 includes a base casing 11 that is in contact with the floor surface 9, a stepping casing 12 that is press-fitted and engaged with the base casing 11 via a rotation shaft 11 a that is integrally formed with the base casing 11, and a base A harness 2 is provided which transmits a signal generated by the foot controller 10 to the main body 1 through the first harness through hole 11b integrally formed on the rear surface of the casing 11. The harness 2 has a connector 3 for electrically connecting the main body 4 of the sewing machine 1 and the harness 2 at one end. The depression casing 12 has a first harness relief recess 11c having an opening that is the same as or slightly larger than the first harness passage hole 11b at a position overlapping the first harness passage hole 11b when depressed.

  The harness 2 can be passed through the second harness through hole 11d or the third harness through hole 11f integrally formed on the side surface of the base casing 11 instead of the first harness through hole 11b. . In the step-on casing 12, the second harness escape recess 11e and the third harness escape are provided in the same manner as the first harness escape recess 11c so that the harness is not disconnected even if the position of taking out the harness 2 from the base casing 11 is changed. It has a recess 11g.

  FIG. 3 is a lower external perspective view of the foot controller 10. A male screw 13a is rotatably engaged with a rear portion of the base casing 11 of the foot controller 10 via a first bearing 13b and a second bearing 13c formed integrally with the base casing 11. The male screw 13a is partly exposed on the lower surface of the base casing 11, and an adjustment dial 13d for rotating the male screw 13a in the rotational direction of the shaft is integrally formed with the male screw 13a. The male screw 13a includes a variable resistance unit 13f (variable resistance). The base 13e is engaged with the male screw 13a by the rotation. At the upper part of the pedestal 13e, a stepping amount transmission rod 13h that pushes down the operation lever 13g of the variable resistance unit 13f when the stepping casing 12 is stepped on is installed. A depression return spring 13j that generates a biasing force in the direction opposite to the depression force applied to the depression casing 12 is inserted into the depression amount transmission rod 13h.

  The variable resistance unit 13f includes other variable resistances such as an encoder printed on the surface of the pedestal 13e that contacts the stepping amount transmission rod 13h and a contact printed on the surface of the stepping amount transmission rod 13h that contacts the encoder. A unit can be substituted. The male screw 13a can be replaced by other engaging means such as a rack. The adjustment dial 13 d can be partially exposed from the side surface or the rear surface of the base casing 11.

  FIG. 4 is a cross-sectional view of the foot controller 10. The foot controller 10 forms a moving device 13 including a male screw 13a and an adjustment dial 13d. A cam 12 a is integrally formed on the inner surface of the step-on casing 12 so as to be substantially parallel to the bottom surface of the base casing 11. The distance A in the horizontal direction in the figure from the tip 13i of the stepping amount transmission rod 13h to the center of the rotation shaft 11a of the base casing 11 can be changed by the moving device 13. The height B from the center of the rotating shaft 11a of the base casing 11 to the tip end portion 13i of the stepping amount transmission rod 13h is set to be constant by the cam 12a when there is no stepping force on the stepping casing 12, and when there is stepping force. It can be changed according to the stepping force between 21 mm and 45 mm.

  FIG. 5 is an explanatory diagram of the moving device 13. The distance A is about 95 mm A1 when the pedestal 13e is set to the foremost part D1, and is about 115 mm A2 when the pedestal 13e is set to the last part D2. C having a height of 24 mm from the upper surface of the pedestal 13e to the tip 13i of the stepping amount transmission rod 13h is always constant while the pedestal 13e is moved from the frontmost part D1 to the rearmost part D2 when there is no stepping force. When there is, it can be changed between 0 mm and 24 mm according to the stepping force. The depression angle E1 of the stepping amount transmission rod 13h is about 14 ° when the stepping amount transmission rod 13h is at the forefront D1, and E2 is about 10 ° when the stepping amount transmission rod 13h is at the forefront D2. It is. The upper tip 13i of the stepping amount transmission rod 13h is always 0 to 1 mm by a cam 12a integrally formed on the inner lower surface of the stepping casing 12 when the stepping amount transmission rod 13h is between the front and rear portions D1 and D2. It is in a state where it is pushed in to a certain extent. The maximum depression angle is between a straight line connecting the rotation shaft 11a and the upper surface of the pedestal 13e and a straight line connecting the rotation shaft 11a and the distal end portion 13i of the depression amount transmission rod 13h in a state where no depression force is applied to the depression casing 12. Is an angle.

  Below, operation | movement of the sewing machine 1 of this invention is demonstrated.

  In FIG. 4, when an operator or a seller (hereinafter referred to as an operator) puts his sole on the stepping casing 12 and applies a stepping force to the stepping casing 12 from substantially above, the urging force of the stepping return spring 13j is applied. Against this, the depression casing 12 and the depression amount transmission rod 13h are pushed downward. When the depression amount transmission rod 13h is pushed downward, the operation lever 13g of the variable resistance unit 13f is pushed down, and the variable resistance unit 13f outputs a resistance value corresponding to the depression amount. The substrate 5 increases or decreases the output voltage to the motor 6 according to the resistance value of the variable resistance unit 13f. The motor 6 increases or decreases the sewing speed (the number of rotations and the rotation torque) according to the output voltage of the substrate 5. By these operations, the sewing speed of the sewing machine 1 becomes 0 rpm when the depression amount of the depression casing 12 is zero, becomes about 700 rpm when the depression amount is maximum (about 24 mm), and the depression amount of the depression casing 12 increases from zero to the maximum. In between, it is a value that is approximately proportionally divided by the amount of depression.

  Below, the effect of the sewing machine 1 of this invention is demonstrated.

  According to the first problem solving means, in the sewing machine 1 of the present invention, the operator can set the stepping angle E1 of the stepping amount transmission rod 13h from about 14 ° when the stepping amount transmission rod 13h is at the foremost portion D1. By including the moving device 13 that can be continuously changed up to about 10 ° when the stepping amount transmission rod 13h is at the rearmost part D2, the sewing characteristics can be selected from the continuous sewing characteristics according to various sewing items. You can select and adjust. That is, when sewing what is called a satin fabric that is easily slippery and easily wrinkled, the position of the pedestal 13e is adjusted to the foremost part D1 to widen the stepable angle transmission rod E1 to about 14 °. The sewing angle and the sewing speed can be carefully adjusted to sew. On the contrary, when sewing what is said to be a non-slip and wrinkle-free cotton fabric, by adjusting the position of the pedestal 13e to the rearmost part D2 and narrowing the stepable angle transmission rod E1 of the stepping amount transmission rod 13h to about 10 °, It becomes possible to sew quickly without worrying about the sewing angle and sewing speed. When sewing polyester fabric or wool fabric having characteristics between both fabrics, the stepping amount transmission rod 13h is adjusted to the necessary position between the foremost part D1 and the last part D2, and the stepping amount transmission rod 13h is stepped on. By freely selecting the possible angle E1 between 14 ° and about 10 ° according to the needs of the operator, the sewing angle and the sewing speed can be freely sewn according to the needs of the operator. . When the position of the base 13e is adjusted to the foremost portion D1 to be sewn by carefully adjusting the sewing angle and the sewing speed, the free running distance (gap) between the upper end of the stepping amount transmission rod 13h and the inner lower surface of the stepping casing 12 is Since it is almost zero, it becomes easier to concentrate on the adjustment of the depression amount. In addition, the sewing machine 1 of the present invention reduces the bending angle in the vertical direction of the ankle and reduces the load on the ankle by setting the stepping angle E1 of the stepping amount transmission rod 13h from 14 ° to about 10 °. You can also Furthermore, the foot controller 10 has a single built-in variable resistance unit 13f so that the stepping direction of the foot controller 10 is one direction substantially perpendicular to the bottom surface of the base casing 1. It is possible to eliminate the need to bend in the horizontal direction.

  According to the second problem solving means, in the sewing machine 1 of the present invention, since the moving device 13 is constituted by the male screw 13a, the adjustment dial 13d, and the pedestal 13e, the sewing characteristics can be easily selected only by turning the adjustment dial. Can be used. In addition, in the sewing machine 1 of the present invention, since the moving device 13 is constituted by the male screw 13a and the adjustment dial 13d, the pedestal 13e can be continuously connected between the frontmost part D1 and the rearmost part D2 only by turning the preparation dial 13d. It is easy to delicately adjust the required position from among the various positions, and the stepping angle E1 of the stepping amount transmission rod 13h can be freely selected between 14 ° and about 10 ° according to the needs of the operator. However, it becomes easier. In the sewing machine 1 of the present invention, the gear engagement ratio between the male screw 13a and the female gear 13m of the pedestal 13e is set to 1 or more to eliminate backlash of both gears, thereby increasing the stepping angle and reducing the gear. It is also possible to eliminate the movement hysteresis and eliminate the mismatch between the position of the base 13e and the sewing characteristics.

(Additional item 1)
A transparent resin is used for the base casing 11, and a scale 13k indicating the amount of movement of the pedestal 13e is integrally formed in the movement range of the pedestal 13e that moves the stepping amount transmission rod 13h between the frontmost part D1 and the rearmost part D2. Yes.

  As a result, the sewing machine 1 of the present invention is designed to sew the pedestal 13e between the foremost part D1 and the last part D2 of the stepping amount transmission rod 13h in order to sew polyester cloth, wool cloth or the like having characteristics between the satin cloth and the wool cloth. When the position of the stepping amount transmission rod 13h is freely adjusted according to the needs of the operator within the range of 14 ° to about 10 ° by adjusting the position to the position of the need, the scale according to the fabric It becomes possible for the operator to easily remember the 13k position.

(Appendix 2)
The base casing 11 is integrally formed with position indication numerals 13l at the right or left position of the scale 13k of the base 13e so that the position of the scale 13k can be seen at a glance.

  As a result, the sewing machine 1 of the present invention is designed to sew the pedestal 13e between the foremost part D1 and the last part D2 of the stepping amount transmission rod 13h in order to sew polyester cloth, wool cloth or the like having characteristics between the satin cloth and the wool cloth. When the position of the stepping amount transmission rod 13h is freely adjusted according to the needs of the operator within the range of 14 ° to about 10 ° by adjusting the position to the position of the need, the scale according to the fabric It becomes possible to make it easier for the operator to remember the 13k position.

1 sewing machine 6 motor 10 foot controller 11a rotating shaft 12 step casing (step surface)
13 moving device 13a male screw (moving device)
13d Adjustment dial (mobile device)
13e Base 13f Variable resistance unit (variable resistance)

Claims (2)

A base casing in contact with the floor surface;
A stepping casing having a press-fitting engagement portion with the pivot shaft that is pivotable through a pivot shaft formed in the base casing;
A variable resistor that adjusts the resistance value according to the amount of depression of the depression casing;
A pedestal having a holding portion of the variable resistance;
A moving device that allows a user to continuously change the maximum depression angle of the stepping casing by moving the pedestal on the base casing in a direction perpendicular to the rotation axis;
A foot controller comprising:
A motor that adjusts the sewing speed according to the resistance value of the variable resistor,
A male screw installed in a direction perpendicular to the rotating shaft on the base casing is rotatably engaged with the base casing via a first bearing and a second bearing formed integrally with the base casing. And
The male screw is partially formed on the lower surface of the base casing, and an adjustment dial for rotating the male screw in the rotation direction of the male screw shaft is integrally formed with the male screw. The pedestal is engaged with the male screw so as to be movable,
At the upper part of the pedestal, a stepping amount transmission rod that pushes down the operation lever of the variable resistance when the stepping casing is stepped on is installed,
Wherein the maximum depression observed angle of the foot controller, the in state depression force is not to depression casing, the center and the amount of depression transmission rod of the linear and the rotational axis connecting the centers and the upper surface of the pedestal of the pivot shaft The sewing machine is the angle between the straight lines connecting the tips of the sewing machines. The sewing machine according to claim 1,
Transparent resin is used for the base casing, and the movement of the pedestal to the movement range of the pedestal in which the stepping amount transmission rod is moved between the foremost part and the rearmost part of the male screw on the male screw via the pedestal. A sewing machine in which a scale indicating the amount is integrally formed.

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