JP2011110352A - Sewing machine - Google Patents

Abstract

To smoothly operate an operation pedal.
A sewing machine main body 10 including a sewing machine mechanism and a sewing machine frame for storing the sewing machine, a table 20 on which the sewing machine main body is installed, a sewing machine motor 30 serving as a drive source for the sewing machine main body, and a sewing machine control unit. A control box 40 that stores the operation of the sewing machine, a pedal sensor 60 that detects the operation of the operation pedal, and a transmission rod 70 that transmits the operation of the operation pedal to the pedal sensor. The sewing machine motor, the control box, and the pedal sensor are individually attached to the table so that the position can be adjusted.
[Selection] Figure 1

Description

  The present invention relates to a sewing machine that forms a seam on a workpiece.

A conventional sewing machine includes a table composed of an upper plate and a frame including four legs. The sewing machine main body is installed on the upper surface of the upper plate, the sewing machine motor is provided on the lower side of the upper plate, and the lower side thereof. Had a control box with built-in control board and operation panel.
An operation pedal for operating the sewing machine (for example, starting and stopping of driving of the sewing machine motor, thread trimming, etc.) is provided at the bottom of the frame, and is a pedal composed of a variable resistor or the like held in the control box Connected to the sensor by a connecting rod, the pedal depression amount or various operation commands are transmitted to the control base in the control box (see, for example, Patent Document 1).

JP 59-055271 A

By the way, the normal sewing machine engages in the work at the position (upstream side in the cloth feed direction) facing the sewing needle provided at the arm section tip of the sewing machine frame. It is desirable to arrange the operation pedal at a position that is in front of the operator.
On the other hand, the sewing machine motor has a structure in which power is input by a timing belt from a motor pulley attached to the output shaft of the motor to a pulley provided on the base end side (vertical body side) of the arm part of the sewing machine frame. It is necessary to dispose the sewing machine motor closer to the base end portion of the arm portion so that the positions of the motor pulley and the pulley in the left-right direction match.
In that case, when the pedal sensor is held in the control box provided on the lower side of the sewing machine motor, in the case of the sewing machine having a long arm portion, the pedal sensor and the operation pedal are separated in the longitudinal direction of the arm portion, The direction of the connecting rod that connects them was not vertical, but had to be arranged obliquely.
Since both ends of the connecting rod are connected to the pedal sensor and the pedal via universal joints, it is possible to transmit power even when the power transmission direction is not parallel to the longitudinal direction of the connecting rod. However, the connecting rod, pedal sensor, and operation pedal are subjected to stress with a directional component different from the originally intended direction of movement, causing unexpected wear and deterioration, and smooth movement transmission due to twisting. The problem of disappearing occurred.

  In addition, the control box is provided with an opening / closing portion for maintenance and the like, and is installed on the table so that it can be opened / closed from the front side. On the other hand, for example, in the case of a sewing machine type in which an oil pan is provided on the lower side of the sewing machine frame, since the oil pan is in the way, it is easier to open and close the control box on the back side than on the front side. Desirable from a viewpoint. However, the conventional sewing machine as described above has a structure in which the control box holds the pedal sensor. Therefore, when the direction of the control box is changed in the front-rear direction, the position of the pedal sensor is reversed left and right. For this reason, it is necessary to separately provide a control box that opens and closes on the back side, which increases the cost, or requires a configuration in which the left and right positions relative to the control box can be changed by attaching and detaching the pedal sensor. Both installation changes were required, and there was a problem that workability was deteriorated.

  An object of the present invention is to enable smooth operation transmission by an operation pedal.

  According to the first aspect of the present invention, there is provided a sewing machine main body comprising a sewing machine part and a sewing machine frame for storing the sewing machine, a table on which the sewing machine main body is installed, a sewing machine motor serving as a drive source for the sewing machine main body, In a sewing machine comprising a control box for storing a control unit, an operation pedal for inputting an operation of the sewing machine, a pedal sensor for detecting the operation of the operation pedal, and a transmission rod for transmitting the operation of the operation pedal to the pedal sensor, The pedal sensor is separate from the control box, and the sewing machine motor, the control box, and the pedal sensor are individually attached to the table so that the position can be adjusted.

  The invention according to claim 2 has the same configuration as that of the invention according to claim 1, and a support for attaching the pedal sensor to the table includes a horizontal part and a vertical part, and the horizontal part of the support is provided. Is characterized in that it is attached to the table via a support for attaching the sewing machine motor to the table.

According to the first aspect of the present invention, the sewing machine motor, the control box, and the pedal sensor are individually attached to the table so that the position of the sewing machine motor can be adjusted. Even when it is necessary to dispose the operation pedal on the tip side of the arm portion in order to ensure workability, the pedal sensor can be provided with a degree of freedom.
As a result, even when the operation pedal is arranged according to the length of the arm portion, the pedal sensor can be appropriately arranged with respect to the table, and the connecting rod can be arranged along the vertical direction. It is possible to suppress the wear and deterioration of the connecting portion and perform smooth operation transmission without twisting.
In addition, since the control box can be freely arranged, even if it has an opening / closing part, it can be arranged either on the front side or the back side depending on the type of sewing machine. It is not necessary to change the position, and workability can be improved.

  According to a second aspect of the present invention, the horizontal portion of the support body of the pedal sensor is attached to the table via the support portion for attaching the sewing machine motor to the table, so that the pulley of the sewing machine and the sewing needle are in the horizontal direction. Even if it is difficult to arrange the support and the support portion in the horizontal direction on the table, it is possible to attach the support to the table after securing the adjustment allowance for the attachment position of the support and the support portion.

It is a front view of a sewing machine. It is a rear view of a sewing machine. It is a rear view of a pedal sensor. It is a perspective view of a pedal sensor.

(Overall configuration of the embodiment of the invention)
An embodiment of a sewing machine 100 according to the present invention will be described. 1 and 2 are a front view and a rear view of the sewing machine 100, respectively.
The sewing machine 100 includes a sewing machine main body 10 including a sewing mechanism and a sewing machine frame for storing the sewing machine, a table 20 on which the sewing machine main body 10 is installed, a sewing machine motor 30 serving as a drive source for the sewing machine main body 10, and a sewing machine 100. A control box 40 for storing the control unit, an operation pedal 50 for inputting an operation of the sewing machine 100, a pedal sensor 60 for detecting the operation of the operation pedal 50, and a transmission rod for transmitting the operation of the operation pedal 50 to the pedal sensor 60. 70.

(Sewing machine body)
The sewing machine body 10 includes a sewing machine bed portion 11, a vertical body portion 12 erected from one end portion of the sewing machine bed portion 11, and an arm portion 13 extending in the same direction as the bed portion 11 on the upper side of the vertical body portion 12. A sewing machine frame, and a mechanism portion for performing sewing stored in the sewing machine frame.
In the following description, the horizontal direction, the extending direction of the bed portion 11 and the arm portion 13 is the left-right direction, the vertical trunk portion 12 side of the bed portion 11 is “right side”, and the free end side of the arm portion is The description will be made on the “left side”. The horizontal direction and the direction orthogonal to the left-right direction is referred to as the front-rear direction.

A needle bar for holding a sewing needle 14 is supported at the left end of the arm 13 so as to be movable up and down, and a pulley 15 is provided at the right end so as to be rotatable about the horizontal direction as a rotation axis. A timing belt 16 for transmitting rotational power from the sewing machine motor 30 is stretched over the pulley 15 so that torque is input.
The pulley 15 is connected to an upper shaft (not shown), and the upper shaft converts a rotational force into a vertical reciprocating motion and transmits it to the needle bar via a crank mechanism. As other mechanisms, a balance mechanism, a thread tension, a cloth feeding mechanism, a shuttle mechanism, and the like are disposed on the sewing machine frame. However, since the configuration of the sewing machine is well known, detailed description thereof will be omitted.

(table)
The table 20 includes a top plate 21 on which the sewing machine body 10 is installed, and a frame 22 on which the top plate 21 is placed and supported.
The top plate 21 has a smooth top surface and is horizontal, and is used as a work table on which a cloth to be sewn is placed. The top plate 21 is formed with an opening therethrough for storing the bed portion 11 of the sewing machine body 10, and holds the bed portion 11 exposed below the top plate 21.
The frame 22 has two struts 23 provided on the left and right sides, and a connecting portion 24 along the left-right direction that connects the bottoms of the respective struts 23, and the operation pedal 50 is set on the upper surface of the connecting portion 24. It is fixed by.

(Sewing machine motor)
The sewing machine motor 30 includes a main body portion 31, a pulley (not shown) attached to the output shaft thereof, and a support portion 32 for fixing the main body portion 31 to the lower surface of the top plate 21 of the table 20. . The support portion 32 is provided with a long hole (not shown) for allowing the fixing bolt 33 to pass through the table 20 so that the attachment position of the sewing machine motor 30 with respect to the table 20 can be adjusted.
The sewing machine motor 30 is arranged adjacent to the back side (back side) in the front-rear direction with respect to the right end of the bed 11 of the sewing machine body 10 with its output shaft directed in the left-right direction. The pulley is located at the right end of the main body 31, and the pulley of the sewing machine motor 30 and the pulley 15 of the sewing machine main body 10 are arranged so that their positions coincide with each other in the left-right direction.

(Control box)
The control box 40 includes a casing having a rectangular parallelepiped shape, a hollow casing, a power supply circuit stored in the casing, a control circuit board, and an operation panel.
The control box 40 is disposed adjacent to the back side (back side) in the front-rear direction with respect to the left end portion of the bed portion 11 of the sewing machine body 10 with the longitudinal direction thereof directed in the left-right direction. Strictly speaking, the left end of the control box is located somewhat to the left of the left end of the bed 11.
In addition, the control box 40 is open on the back side, so that internal maintenance and operation of the operation panel can be performed.

(Operating pedal)
The operation pedal 50 has a tread 51 and a support portion 52 that supports the tread 51 in the left and right sides by a shaft along the left-right direction so that each support 52 can connect the table 20 described above. Fixed to the upper surface of the part 24 by screws.
The tread 51 has a neutral position in which the tread surface is inclined at a certain angle to the front side, and can be rotated from the neutral position to the back side by a stepping operation. And operation which inputs a sewing speed according to the rotation angle from a neutral position is performed.
The step board 51 is pivotally supported by the support parts 52 and 52 from both sides at an intermediate position in the front-rear direction at both left and right end parts, and the end part on the back side of the tread board 51 is lowered by stepping on. In addition, the end of the connecting rod 70 is connected to the rear side of the right end of the tread 51 through a universal joint 71. As a result, the downward movement amount due to depression of the tread plate 51 is transmitted to the pedal sensor 60.
Further, the center position of the operation pedal 50 in the left-right direction of the tread 51 is set so as to substantially coincide with the sewing needle 14 provided at the left end of the arm 13 of the sewing machine body 10 in the left-right direction.

(Pedal sensor)
FIG. 3 is a rear view of the pedal sensor 60 as viewed from the back, and FIG. 4 is a perspective view of the pedal sensor 60 as viewed from the right rear side.
The pedal sensor 60 includes a variable resistance element 61, an L-shaped bell crank 62 fixedly mounted on the input shaft of the variable resistance element 61, and a rotational force in a fixed direction with respect to one arm portion 62a of the bell crank 62. , A stopper 64 that stops the bell crank 62 at a fixed position against the rotational force urged by the spring 63, and a support that fixes the variable resistance element 61 to the lower surface of the top plate 21 of the table 20. And a body 65.

The support body 65 includes a plate-like horizontal portion 65a attached to the lower surface side of the top plate 21 and a plate-like vertical portion 65b vertically suspended from the horizontal portion 65a. A through-hole is formed in the horizontal portion 65a. The top plate 21 is screwed. Such a through hole is a long hole along the left-right direction, and the position of the pedal sensor 60 can be adjusted in the left-right direction.
The vertical portion 65b is suspended vertically downward from the left end portion of the horizontal portion 65a, and its flat plate surface is parallel to the vertical vertical direction and the front-rear direction.
In the present embodiment, the horizontal portion 65 a of the support body 65 is fixed to the top plate 21 of the table 20 by the fixing bolt 33 via the support portion 32. Such a mounting form is performed when the distance between the sewing machine pulley 15 and the sewing needle 14 in the horizontal direction is short and it is difficult to mount the support body 65 and the support portion 32 in the horizontal direction on the top plate 21. When the distance between the pulley 15 and the sewing needle 14 in the horizontal direction is long and it is easy to arrange the support body 65 and the support portion 32 in the horizontal direction and attach to the top plate 21, the horizontal portion 65a of the support body 65 is directly It is attached to the plate 21.
A variable resistance element 61 is attached to the left surface of the vertical portion 65b, and an input shaft 61a extends from the lower left surface of the variable resistance element 61. The input shaft 61a is parallel to the left-right direction. When a rotation operation is input to the input shaft 61a, the variable resistance element 61 exhibits a resistance value corresponding to the rotation angle, and the control circuit board in the control box 40 is By detecting the resistance value indicated by the variable resistance element 61, the amount of depression of the operation pedal 50 is detected, and drive control of the sewing machine motor 30 is performed at a rotational speed corresponding to the detected amount.

The bell crank 62 is supported by the input shaft 61a of the variable resistance element 61 with an L-shaped bent portion, and has an arm portion extending in two directions around the input shaft 61a.
One arm portion 62a of the bell crank 62 extends generally upward, and the other arm portion 62b extends generally toward the front side.
The above-described spring 63 is connected to one arm portion 62a, and is biased in a direction to rotate the other arm portion 62b upward.
The upper end portion of the connecting rod 70 is connected to the other arm portion 62 b via the universal joint 72. As a result, the tension of the spring 63 is transmitted to the operation pedal 50 via the bell crank 62, and the operation pedal 50 is turned in a direction to return to the neutral position with respect to the stepping operation.

Further, the stopper 64 is located downstream in the direction of biasing force by the spring 63 with respect to one arm portion 62a of the bell crank 62, and is prevented from rotating by being abutted against the arm portion 62a. Yes. The stopper 64 defines the neutral position of the operation pedal 50 by stopping the arm portion 62a.
The stopper 64 is supported on the support body 65 by a screw structure, can be moved and adjusted along the front-rear direction by a rotating operation, and can adjust the abutting position with the arm portion 62a. Thereby, the neutral position of the stopper 64 can be changed and adjusted.

(Connecting rod)
The connecting rod 70 connects the first to third rod-shaped bodies 73 to 75, the coupling body 76 that couples the first and second rod-shaped bodies 73 and 74, and the second and third rod-shaped bodies 74 and 75. It is comprised from the connection body 77 which does.
The connecting body 76 can be connected by overlapping the lower portion of the first rod-like body 73 and the upper portion of the second rod-like body 74 and fastening them with screws, and the first rod-like body 73 and the second rod 76 are loosened by loosening the screws. The connecting position with the rod-shaped body 74 can be moved to adjust the length.
Similarly, the connecting body 77 can be connected by overlapping the lower portion of the second rod-like body 74 and the upper portion of the third rod-like body 75 and fastening them with screws, and the second rod-like shape can be connected by loosening the screws. The connecting position between the lower part of the body 74 and the third rod-like body 75 is moved, and the length can be adjusted.
Therefore, the connecting rod 70 can arbitrarily adjust the length of the whole length by the above structure.

The upper end portion of the first rod-like body 73 is connected to the left end portion of the pedal sensor 60 via the universal joint 72. The universal joint 72 allows the connecting rod 70 to rotate with respect to the bell crank 62 around the rotation axis along the left-right direction and tilts in the front-rear, left-right direction.
Further, the lower end portion of the third rod-like body 75 is connected to the right end portion of the operation pedal 50 via the universal joint 71. The universal joint 71 enables the connecting rod 70 to rotate with respect to the tread plate 51 around a rotation axis along the left-right direction and tilts in the front-rear, left-right direction.

(Machine operation)
In the sewing machine 100 having the above-described configuration, when the operator depresses the tread plate 51 of the operation pedal 50, the depressing amount is detected by the pedal sensor 60 and output to the control circuit board in the control box 40. The control circuit board drives the sewing machine motor 30 at a speed corresponding to the detected depression amount of the operation pedal 50, whereby the sewing machine body 10 executes sewing. Note that the depression amount of the operation pedal 50 is continuously detected at a predetermined cycle, and sewing is performed by always reflecting the depression amount that changes during sewing.

(Arrangement of each component)
In the sewing machine 100, as described above, the center part in the left-right direction of the tread plate 51 of the operation pedal 50 is arranged so as to substantially match the sewing needle 14 in the left-right direction.
On the other hand, since the sewing machine motor 30, the control box 40, and the pedal sensor 60 are separated and individually installed on the table 20, the sewing machine motor 30 has a pulley that coincides with the pulley 15 of the sewing machine body 10 in the left-right direction. However, it is possible to arrange the control box 40 and the pedal sensor 60 at arbitrary positions.
And about the pedal sensor 60, the connection position (position of the universal joint 72) of the pedal sensor 60 and the connection rod 70 and the connection position (position of the universal joint 71) of the operation pedal 50 and the connection rod 70 are the left-right direction. Are attached to the table 20 so as to agree with each other.
Thereby, the connecting rod 70 can be arranged so that the upper end and the lower end thereof are not inclined in the left-right direction, and the displacement in the up-down direction due to the depression of the operation pedal 50 is transmitted to the pedal sensor 60. Thus, it is possible to effectively prevent the occurrence of wear and deterioration due to the occurrence of stresses other than in the vertical direction, and realize smooth motion transmission without twisting.
When a sewing machine body of a different type from the above is used for the sewing machine body 10 or when a sewing machine body having a longer arm portion 13 is used, the tread 51 of the operation pedal 50 is positioned at the sewing needle position held by the sewing machine body. In addition, it is necessary to set the arrangement in the left-right direction. However, since the pedal sensor 60 is not restricted by any other configuration with respect to the arrangement, the pedal sensor 60 can be arranged corresponding to the arrangement of the new operation pedal 50. With respect to the sewing machine body, it is possible to easily avoid the tilting of the connecting rod 70 in the left-right direction, to prevent wear and deterioration due to the occurrence of stresses other than the vertical direction, and to realize smooth motion transmission without twisting. It is possible to enjoy the effect.

Further, as described above, since the control box 40 can also be arbitrarily arranged without being restricted by the arrangement of the pedal sensor 60 and the sewing machine motor 30, for example, oil is applied to the bottom surface of the bed portion 11 of the sewing machine body 10. Even when the control box 40 is arranged avoiding the sewing machine main body 10 such as equipped with a pan, the arrangement and orientation of the control box 40 can be arbitrarily set. For example, the opening portion faces the back side. Arrangement can be easily realized, and workability can be improved.
The control box 40 may be provided with a long hole in the left-right direction and attached to the top plate 21 of the table 20 with a bolt or a screw through the long hole so that the position adjustment in the left-right direction may be possible. . Further, the front and rear directions of the control box may be attached in the reverse direction by providing an extra long hole or providing a long hole in a symmetrical arrangement.

10 sewing machine body 20 table 30 sewing machine motor 40 control box 50 operation pedal 60 pedal sensor 70 transmission rod

Claims (2)

A sewing machine body composed of a sewing machine part and a sewing machine frame for storing it;
A table on which the sewing machine body is installed, and
A sewing machine motor as a drive source of the sewing machine body;
A control box for storing the control unit of the sewing machine;
An operation pedal for inputting the operation of the sewing machine;
A pedal sensor for detecting the operation of the operation pedal;
In a sewing machine comprising a transmission rod that transmits the operation of the operation pedal to a pedal sensor,
The pedal sensor is separated from the control box,
The sewing machine, wherein the sewing machine motor, the control box, and the pedal sensor are individually attached to the table so as to be adjustable in position.   A support for attaching the pedal sensor to the table comprises a horizontal part and a vertical part, and the horizontal part of the support is attached to the table via a support part for attaching the sewing machine motor to the table. The sewing machine according to claim 1, wherein

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