JP2009207734A - Marking illumination device of sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a marking illumination device of sewing machines which is can stabilize reproducibility of finish in sewing. <P>SOLUTION: In a case where an angle of a marking light 31 is changed according to a reference position for positioning a body cloth C to be mounted on a table 11 when illuminating a point mark P at the reference position with a light emitted from a first marking light 31, this marking illumination device 30 can adjust the output of the marking light 31 to increase the light intensity more as its illumination angle becomes shallower from the angle where the marking light 31 illuminates the point mark P in the substantially perpendicular direction to the table 11, and the marking illumination device 30 changes its output of the light according to the angle of the marking light 31 to the table 11, so that, whatever angle it is, the point mark P illuminated toward the table 11 is illuminated at substantially the same brightness. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a marking irradiation apparatus for a sewing machine.

2. Description of the Related Art Conventionally, there has been known a marking light device for a sewing machine that displays a reference line indicating a reference position on which a cloth is to be placed by a projected light beam when sewing is performed on the sewing machine (see, for example, Patent Document 1).
JP 2001-162078 A

However, in the case of the above-described prior art, when performing sewing with different reference positions of the fabric, if the angle of the projector is adjusted according to the reference position, the brightness of the projected light beam indicating the reference line changes. Depending on the position of the line, the fabric may be easily displaced.
Specifically, when light is projected substantially perpendicularly to the fabric at a position close to the projector, the reference line corresponding to the projection is clearly displayed with high brightness, but away from the projector When light is projected onto the position at a shallow angle toward the fabric, the reference line corresponding to the light projection is relatively dark and blurred. That is, this type of irradiation light usually has the luminous intensity distribution shown in FIG. 10, and it is possible to visually recognize the bandwidth D having a strong luminous intensity. However, when the luminous intensity of the bandwidth D falls, the whole is blurred. You will see. For example, when positioning the fabric with respect to this unclear reference line, misalignment of the fabric is likely to occur, so that the sewing finish tends to vary.
The sewing finish is stable depending on the clearly displayed reference line, and the sewing finish varies depending on the unclear reference line. Therefore, the reproducibility of the sewing finish varies depending on the position of the reference line. was there.

  An object of the present invention is to provide a marking irradiation apparatus for a sewing machine that can stabilize the reproducibility of a sewing finish.

  In order to solve the above problems, the invention described in claim 1 has a light emitting portion disposed above a placing table on which a fabric to be sewn in a sewing machine is placed, and emits light from the light emitting portion. By the above, a marking irradiation apparatus for a sewing machine that irradiates a point mark to a reference position for alignment of the fabric placed on the placement table, and an angle adjustment unit that switches the irradiation angle of the light emitting unit according to the position of the reference position And a light amount adjusting means for adjusting the amount of light output from the light emitting unit according to the irradiation angle of the light emitting unit switched by the angle adjusting unit, the light amount adjusting unit being away from the vertical direction facing the mounting table. The amount of light is adjusted so that the amount of light increases corresponding to the change in the irradiation angle of the light emitting unit.

According to the first aspect of the invention, the marking irradiation apparatus for the sewing machine irradiates the point mark by the light emission from the light emitting unit to the reference position for performing the alignment of the cloth placed on the placing table. When the angle of the light emitting unit is switched according to the reference position, the amount of light increases as the irradiation angle changes away from the vertical direction from the angle at which the light emitting unit irradiates the point mark in a substantially vertical direction toward the mounting table. So that the output of the light emitting unit can be adjusted.
Then, the marking irradiation device switches the light output according to the angle of the light emitting unit with respect to the mounting table, so that the angle of the light emitting unit is the angle (light path) from the light emitting unit to the mounting table. Even if they are different from each other, it becomes possible to make the point marks irradiated on the mounting table and the cloth have almost the same brightness.

  According to a second aspect of the present invention, in the marking irradiation apparatus for a sewing machine according to the first aspect, the light amount adjusting means is configured such that the angle of the light emitting unit switched by the angle adjusting means is an angle exceeding a predetermined limit angle. The light emitting unit is adjusted to be turned off.

  According to the second aspect of the present invention, the same effect as that of the first aspect of the invention can be obtained, and the irradiation angle of the light emitting unit switched by the angle adjusting means is an angle exceeding a predetermined limit angle. When the light emitted from the light emitting unit is at an angle that is easy to face the sewing machine user's face and eyes, the light amount adjusting means turns off the light emitting unit and prevents the light emitted from the light emitting unit from being dazzled by the operator. The irradiation light can be prevented from interfering with the operator's work.

  According to a third aspect of the present invention, in the marking irradiation apparatus for a sewing machine according to the first or second aspect, the sewing machine is a bead stitch sewing machine that performs bead stitching on a fabric.

  According to the invention described in claim 3, the same effect as that of the invention described in claim 1 or 2 can be achieved, and the alignment of the fabric subjected to the bead stitching in the bead stitch sewing machine can be suitably performed.

According to the present invention, the marking irradiation apparatus for a sewing machine is provided at the reference position for irradiating the point mark by light emission from the light emitting unit at the reference position for aligning the cloth placed on the placing table. When switching the angle of the light emitting unit accordingly, from the angle at which the light emitting unit irradiates the point mark in a substantially vertical direction toward the mounting table, the amount of light increases as the irradiation angle changes away from the vertical direction, The output of the light emitting unit can be adjusted. Then, the marking irradiation device switches the light output according to the angle of the light emitting unit with respect to the mounting table, so that the angle of the light emitting unit is different and the optical path distance of light from the light emitting unit to the mounting table is different. It is possible to make the point marks irradiated on the cloth and the cloth have almost the same brightness.
And even if the reference position of the fabric is different depending on the type of sewing and the type of work to be sewn, the point mark indicating the reference position is displayed with the same brightness, so the point mark at any position The fabric can be aligned in the same way.
In other words, even if the position of the point mark differs depending on the type of sewing and the type of the item to be sewn, the point mark is always displayed in the same form according to the marking irradiation device of this sewing machine. Since the position alignment of the fabric with respect to the point mark is stabilized, the reproducibility of the sewing finish can be stabilized.

(Overall configuration of the stitching machine)
Hereinafter, a bead stitch sewing machine 10 according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing an overall schematic configuration of the edge stitch sewing machine 10, and FIG. 2 is a front view of the edge stitch sewing machine 10.
In the present embodiment, the direction of each part of the sewing machine 10 is determined based on the XYZ axes shown in the drawings. In a state where the sewing machine 10 is installed on the horizontal plane, the Z-axis direction indicates a vertical direction, the X-axis direction indicates a horizontal direction that coincides with the cloth feed direction, and the Y-axis direction is horizontal and orthogonal to the X-axis direction. Indicates direction.

The bead stitch sewing machine 10 has a table 11 as a mounting table as a sewing work table and a point mark P for aligning the cloth C as a set position (reference position) on the table 11. Marking irradiation device 30 having marking lights 31 and 32 as light emitting portions for irradiating laser light on C, and a large conveying means for conveying the body cloth C from the set position to the vertical movement position of the two sewing needles 13 Feed along the X-axis direction by the press feed mechanism 40, a binder mechanism that folds both sides of the cloth into contact with the binder 12 (not shown) sewn on the cloth C, and a large press feed mechanism 40. A needle up-and-down moving mechanism for forming a seam by moving the two sewing needles 13 up and down by a main shaft motor 16 with respect to the body cloth C, and a moving knife 14 on the downstream side in the cloth feed direction of the sewing needle 13 Stores a knife mechanism that lowers and forms a cut in the body cloth C, a hook mechanism that captures the sewing thread from the sewing needle 13 and entangles the lower thread, and a needle vertical movement mechanism and a female mechanism that are installed on the table 11 A sewing machine frame 80 to be held, a corner knife mechanism 90 for forming a substantially V-shaped cut at positions corresponding to both ends of the straight cut, and an operation control means 60 for controlling the operation of each of the above-described components are provided.
When the sewing machine 10 starts sewing, no other input operation is required, and according to various processes performed by the operation control means 60 according to various parameters required for the ball sewing, which are set in advance. This corresponds to a so-called automatic edge stitch sewing machine in which a series of sewing operations are performed.
Each part is described in detail below.

(Table and sewing frame)
The table 11 has an upper surface parallel to the XY plane and is used in a horizontal state. A needle plate 15 is attached to a needle drop position 15 a of the table 11 by the sewing needle 13. The needle plate 15 is formed with a needle hole into which the two sewing needles 13 are individually inserted and a slit into which the moving knife 14 of the knife mechanism is inserted.
Further, a recess for storing the bed portion 81 of the sewing machine frame 80 is formed on the table 11, and the sewing machine frame 80 is installed in the recess. Further, the table 11 is provided with a large press feed mechanism 40 and a corner knife mechanism 90 on the downstream side in the cloth feed direction of the sewing machine frame 80, and a binder mechanism (not shown except for the binder 12) on the upstream side in the cloth feed direction. Has been placed.

The sewing machine frame 80 mainly includes a bed portion 81 installed on the table 11, a vertical trunk portion 82 erected therefrom, and an arm portion 83 extending horizontally from the upper portion thereof.
A main shaft motor 16 is disposed below the sewing machine frame 80, and a lower shaft that transmits the rotational driving force of the shuttle mechanism from the main shaft motor 16 is supported in the bed portion 81 in a state along the Y-axis direction. In the arm portion 83, an upper shaft that transmits the vertical movement driving force of the needle vertical movement mechanism from the main shaft motor 16 is supported in a state along the Y-axis direction.
A pulley is fixedly mounted on each of the upper shaft and the lower shaft, and is connected by a timing belt passed through the vertical body portion 82 of the sewing machine frame 80.

(Needle vertical movement mechanism)
The needle up-and-down movement mechanism includes two sewing needles 13 constituting two needles, two needle bars that hold the respective sewing needles 13 of the two needles at the lower end, and each needle bar along its longitudinal direction. The upper and lower metal bearings that are slidably supported, the needle bar holder that holds the two needle bars at the same time, the upper shaft that is rotationally driven by the main shaft motor 16, and one end of the upper shaft are fixedly connected to each other for rotational movement. It has a well-known configuration including a rotating weight to be performed and a crank rod having one end connected to a position eccentric from the rotation center of the rotating weight and the other end connected to a needle bar holder.
When the upper shaft is rotated, the rotating weight rotates in the same manner, one end of the crank rod performs a circular motion around the upper shaft, and the other end moves in the Z-axis direction of the circular motion of the one end. Only the needle bar is transmitted to each needle bar so that each needle bar moves up and down.
The two sewing needles 13 are arranged side by side along the Y-axis direction, and form two stitches along the X-axis direction on the body cloth C conveyed along the X-axis direction.

(Female mechanism)
The knife mechanism includes a moving knife 14 that forms a linear cut, a knife provided with the knife 14 at the lower end and supported so as to move up and down within the arm 83, and a drive source for moving the knife up and down. And a transmission mechanism for transmitting the rotational driving force from the female motor in place of the reciprocating driving force in the vertical direction.
That is, the knife motor performs rotational driving together with the feeding operation of the body cloth C, moves the moving knife 14 up and down by the transmission mechanism, and repeatedly forms cuts according to the knife width to form linear cuts.

(Hook mechanism)
The shuttle mechanism is provided in the bed portion 81 of the sewing machine frame 80. This hook mechanism is equipped with two horizontal hooks individually corresponding to the two sewing needles 13, a hook gear provided on the rotating shaft of each horizontal hook, and a fixedly mounted on the lower shaft, and each hook gear rotates individually. And a transmission gear for applying a driving force.
As described above, a rotational driving force is applied to the lower shaft from the output shaft of the spindle motor 16 by the timing belt. When the lower shaft is rotationally driven, the rotational driving force is transmitted to the hook gear via each transmission gear, and each horizontal hook rotates via the hook shaft. Each horizontal hook catches the sewing thread from the sewing needle 13 when the tip of the sewing needle 13 is lowered to the lower side of the needle plate 15 and rotates it so that the loop is passed through the horizontal hook to rotate the lower thread. Insert and thread the sewing thread and bobbin thread.

(Binder mechanism)
The binder mechanism has an inverted T-shaped cross section, a binder 12 that is set so as to wind a ball and is sent out along the longitudinal direction, and a support mechanism (not shown) that supports the binder 12 so as to be movable up and down. is doing.
The binder 12 has an inverted T-shape when viewed in cross section from a bottom plate facing the top surface of the table 11 and a standing plate erected perpendicularly to the top surface of the flat plate.
The support mechanism includes an air cylinder (not shown) that serves as a drive source for the raising and lowering operation of the binder 12, a solenoid valve that drives the air cylinder, and a plurality of mechanisms that apply the driving force of the air cylinder to the binder 12 in place of the vertical moving force. And link body.
At the time of sewing, the binder mechanism lowers the binder 12 by the air cylinder, and the ball cloth is bonded to the binder 12 so as to have a cross-sectional shape of the binder 12 in cooperation with a pair of large pressers 41 of the large press feed mechanism 40 described later. The webbing is fed out in the longitudinal direction while being held so as to be wound around the body cloth, and sewing to the body cloth C is performed.

(Large press feed mechanism)
The large presser feed mechanism 40 includes a pair of large pressers 41 (one of which is not shown) that presses the cloth C from above at positions on both sides of the sewing needle 13, and a support body that supports the large pressers 41 so as to be movable up and down. 42, a pressing air cylinder 43 as a vertically moving drive means for moving the large presser 41 up and down with respect to the support 42, an electromagnetic valve for controlling the driving of the pressing air cylinder 43, and the large presser 41. A pressing motor (not shown) that moves the cloth C in the cloth feeding direction, and a ball screw mechanism 46 that converts the rotational driving force of the pressing motor into a linear driving force along the X-axis direction and transmits it to the support 42. It is equipped with.
Each large presser 41 is a flat plate that is wedge-shaped in cross-sectional view and rectangular in plan view, and is supported by the support 42 in a state in which the longitudinal direction is along the X-axis direction. And it can switch to two upper and lower positions by the drive of the air cylinder 43, and when it is an upper position, it separates from the upper surface of the table 11, and descends to near the upper surface height of the table 11 in a lower position.
The ball screw mechanism 46 supports the support 42 so as to be movable along the X-axis direction on the table 11, and the two large pressers 41 supported by the support 42 are on both sides of the vertical movement path of the two needles 13. Is arranged to pass through.

(Corner knife mechanism)
The corner knife mechanism 90 is arranged below the table 11 and in the passage path of the large presser 41 by the large presser feed mechanism 40, and the large presser feed mechanism 40 operates the corner knife 91 composed of a pair of scalpels 91a and 91b. A substantially V-shaped cut is formed at a position corresponding to both ends of the straight cut by penetrating the body knife C from below and passing through the corner knife 91.
That is, the corner knife mechanism 90 includes an air cylinder 92 that moves the corner knife 91 up and down, an electromagnetic valve that drives the air cylinder 92, and a drive motor 94 that moves and positions the knife 91a along the X-axis direction. Yes.
The corner knife 91 has a V-shaped cross section viewed from above, and forms a V-shaped cut through each body cloth C from below.
That is, when the body cloth C and the drape, in which the seam and the linear cut are formed, are conveyed by the large press feed mechanism 40 to a predetermined position downstream of the moving knife 14 in the cloth feeding direction, the corner knife is moved. Position and raise the lower position on one end side of the cut, then position and raise the corner knife 91 on the lower position on the other end side of the cut to form two V-shaped cuts.

(Marking irradiation device)
As shown in FIG. 3, the marking irradiation device 30 includes a first marking light 31 as a light emitting unit that irradiates slit light P <b> 1 along the Y-axis direction toward the lower table 11, and the X-axis direction. A second marking light 32 as a light emitting unit for irradiating the slit light P2 toward the lower table 11, and an angle adjusting means for adjusting the rotation of the first marking light 31 about an axis along the Y-axis direction. A marking light angle adjusting motor 33, a light amount adjusting device 36 as a light amount adjusting means for adjusting the amount of light emitted from the first marking light 31, and the front side of the front end of the sewing machine arm portion 83 toward the upstream side in the sewing direction. A first marking light 31 that is extended and pivotally supported above the table 11 via a marking light angle adjusting motor 33 is pivotally supported. The second marking light 32 extends from the front side of the front end of the sewing machine arm portion 83 toward the upstream side in the sewing direction and rotates the second marking light 32 above the table 11 about the axis along the X-axis direction. And a second support portion 35 that is pivotally supported.

3 and 4, the point mark P that the marking irradiation device 30 irradiates on the upper surface of the table 11 includes the slit light P <b> 1 and the second marking light 32 along the Y-axis direction that the first marking light 31 irradiates. It is comprised from the slit light P2 along the X-axis direction to irradiate. That is, the setting position of the cloth C is indicated by the intersection position of the slit light P1 and the slit light P2.
The slit light P1 along the Y-axis direction irradiated by the first marking light 31 indicates the reference position component in the X-axis direction at the set position, and along the X-axis direction irradiated by the second marking light 32. The slit light P2 indicates a reference position component in the Y-axis direction at the set position.

  The second support portion 35 includes a fastening screw (not shown) that fixes and holds the second marking light 32. With the fastening screw loosened, the irradiation position and irradiation angle of the second marking light 32 are manually adjusted around the axis along the X-axis direction, and the slit light P2, which is a point mark, is sewn into two stitches. Position adjustment and angle adjustment of the second marking light 32 are performed so as to pass through the intermediate position of the needle 13.

Further, in the first support portion 34, the first marking light 31 pivotally supported by the drive shaft extending in the Y-axis direction is rotated around the axis along the Y-axis direction by driving the marking light angle adjusting motor 33. By rotating, the position adjustment and angle adjustment of the first marking light 31 are performed.
The marking light angle adjusting motor 33 is a stepping motor whose operation is controlled by the operation control means 60. The position mark and the angle of the first marking light 31 are switched by the step driving to irradiate the first marking light 31. The irradiation position of the slit light P1 can be moved along the X-axis direction.

Then, when the angle of the first marking light 31 in the marking irradiation device 30 is switched by the marking light angle adjusting motor 33, the amount of light emitted from the first marking light 31 is adjusted by the light amount adjusting device 36. It has become so.
Specifically, the light amount adjusting device 36 increases the light amount as the irradiation angle becomes shallower from the angle at which the first marking light 31 irradiates the point mark P (slit light P1) in a substantially vertical direction toward the table 11. Is adjusted so that the light emission output of the first marking light 31 is increased.
Particularly, the brightness of the point mark P when the first marking light 31 is irradiated at an angle that is substantially perpendicular to the table 11 and the optical path toward the table 11 is the shortest distance, and the first marking light. The brightness of the point mark P when the light 31 is irradiated obliquely with respect to the table 11 and irradiated with light at an angle that is a long light path as compared with the case where the irradiation angle is shallow and the angle is substantially vertical is approximately. The light amount adjusting device 36 is configured to adjust the amount of light emitted from the first marking light 31 so as to have the same brightness.

  In addition, the light amount adjusting device 36 adjusts to turn off the first marking light 31 when the angle of the first marking light 31 switched by the marking light angle adjusting motor 33 becomes a shallow angle exceeding a predetermined limit angle. Is supposed to do.

  Next, adjustment of the amount of light output from the marking irradiation device 30 will be described.

The first marking light 31, the second marking light 32, the marking light angle adjustment motor 33, and the light quantity adjustment device 36 in the marking irradiation device 30 are connected to the operation control means 60 as shown in FIG. The operation is controlled by the operation control means 60.
The operation control means 60 includes a CPU 61 that controls various parts of the sewing machine, a program memory 62 that stores various programs, and a memory 63 that stores control data and setting data.
The program memory 62 stores a sewing program, in particular, a normal sewing program 62a related to the edge stitching, and a marking light adjustment program 62b related to the control of the first marking light 31.
The memory 63 is data for adjusting the amount of light output from the first marking light 31 and a command for outputting an appropriate amount of light according to the angle of the rotated first marking light 31. The voltage value (Vc) is stored as light amount adjustment data 63 a associated with the angle of the marking light angle adjustment motor 33. Specifically, the light amount adjustment data 63a outputs an appropriate light amount that makes the point mark P irradiated to an arbitrary reference position on the table 11 corresponding to the angle of the rotated first marking light 31 have substantially the same brightness. This is data relating to the command voltage value (Vc).
The memory 63 also stores sewing data related to various types of edge stitches. As the sewing data, for example, a sewing start position as a reference position is also stored, and this sewing start position is a position that varies depending on the type of edge stitching.
The light quantity adjustment data 63a in which the angle of the marking light angle adjustment motor 33 and the command voltage value of the light quantity corresponding to the angle are combined so as to correspond to a reference position such as a sewing start position in each sewing data is related. The point mark P output from the first marking light 31 can be applied to a reference position determined for each sewing data.

And the light quantity adjustment data 63a is not the angle of the first marking light 31 (that is, the angle of the marking light angle adjusting motor 33). The command voltage value (Vc) corresponding to the amount of light output from the first marking light 31 is associated with the angle of the marking light angle adjusting motor 33 so that the brightness is substantially constant. A larger command voltage value (Vc) is set so that the light quantity of the first marking light 31 increases as the irradiation angle of the light emitted from the one marking light 31 to the table 11 becomes shallower than 90 °. It is associated.
Further, in the light amount adjustment data 63a, a shallow angle in which the angle of the first marking light 31 (the angle of the marking light angle adjustment motor 33) exceeds a predetermined limit angle (for example, an angle of 10 ° with respect to the upper surface of the table 11). The command voltage value (Vc) with a voltage value of zero (Vc = 0) is associated with the first marking light 31 so that the first marking light 31 is turned off.

As shown in FIG. 6, the light amount adjusting device 36 includes an NPN transistor 1, and a first marking light 31, which is a light emitting diode, is electrically connected to the emitter side of the transistor 1.
The light amount adjusting device 36 is electrically connected to the current detection resistor 3 interposed between the first marking light 31 and the ground 2 and the base side of the transistor 1 via the current limiting resistor 4 and the first. The marking light 31 and the operational amplifier 5 connected between the current detection resistor 3 are provided, and a power source is connected to the collector side of the transistor 1.

Then, the CPU 61 of the operation control means 60 executes the marking light adjustment program 62b, reads the light amount adjustment data 63a from the memory 63, and commands according to the angle of the marking light angle adjustment motor 33 of the marking irradiation device 30 in the operation state. By applying the voltage value (Vc) to the light amount adjusting device 36 through the operational amplifier 5, the first marking light 31 emits light of a predetermined light amount corresponding to the angle of the marking light angle adjusting motor 33. Yes.
Specifically, when the command voltage value “Vc” is applied to the operational amplifier 5 of the light amount adjusting device 36, if the resistance value of the current detection resistor 3 is “R”, the first marking is made from the power source through the transistor 1. The current of “I = Vc / R” is supplied to the light 31, and the first marking light 31 emits light with brightness according to the command voltage value (Vc), and the point mark is directed toward the table 11. Irradiate P.
That is, the first marking light 31 irradiates the table 11 with a light irradiation angle that is shallower than 90 °, that is, the irradiation angle changes so as to move away from the vertical direction. As the light quantity of the marking light 31 increases, the brightness of the point mark P irradiated to a position close to the first marking light 31 and the brightness of the point mark P irradiated to a position away from the first marking light 31. Makes it possible to obtain almost the same brightness.

Moreover, when the irradiation angle of the light which the 1st marking light 31 irradiates with respect to the table 11 becomes a shallow angle exceeding a predetermined limit angle (for example, angle of 10 degrees with respect to the upper surface of the table 11), command voltage Since the value is zero (Vc = 0), no current is supplied from the power source to the first marking light 31 (I = 0), and the first marking light 31 is turned off.
Then, when the irradiation angle of the first marking light 31 becomes a shallow angle exceeding the limit angle, and the irradiation light of the first marking light 31 becomes an angle that is easy to face the sewing machine user's face and eyes, the irradiation light is dazzled. The first marking light 31 is turned off so as not to feel it, so that the irradiation light does not hinder the work.

  Next, the light amount adjustment processing in the marking irradiation device 30 will be described based on the flowcharts shown in FIGS.

  First, when the main power supply of the sewing machine 10 is turned on (step S101), the marking light angle adjusting motor 33 of the marking irradiation device 30 is activated, and the origin of the stepping motor is searched (step S102).

Next, the CPU 61 of the operation control means 60 executes the normal sewing program 62a and the marking light adjustment program 62b, and reads predetermined sewing data and light amount adjustment data 63a from the memory 63 (step S103).
Then, the CPU 61 performs marking so that the first marking light 31 irradiates the slit light P1 as the point mark P toward the reference position corresponding to the sewing or sewing object to be executed based on the predetermined sewing data. The light angle adjustment motor 33 is driven to start the movement of the first marking light 31 (step S104). The angle at which the second marking light 32 irradiates the slit light P2 is manually adjusted in advance.
Then, when the movement of the first marking light 31 is started so as to adjust the angle of the first marking light 31, the CPU 61 executes a marking light light amount adjustment process (step S105).

In the marking light light amount adjustment processing in step S105, the CPU 61 acquires the angle of the marking light angle adjustment motor 33 in the read light amount adjustment data 63a as in the subroutine shown in FIG. 8 (step S51).
And CPU61 judges whether the angle of the acquired marking light angle adjustment motor 33 is more than a limit angle (step S52).
If the angle of the marking light angle adjustment motor 33 is less than the limit angle (step S52; No), the command voltage value (Vc) associated with the angle is acquired from the memory 63 (light quantity adjustment data 63a) (step S52). In step S53, a voltage based on the command voltage value (Vc) is output to the operational amplifier 5 of the light amount adjusting device 36 (step S54). And the 1st marking light 31 is light-emitted by the brightness according to the command voltage value (Vc), the point mark P is irradiated toward the table 11 (step S55), and it transfers to step S106.
In this way, the marking irradiation device 30 switches the light output according to the angle of the first marking light 31 with respect to the table 11, so that the angle of the first marking light 31 is different, and the first marking light 31 Even when the optical path distance of the light to the table 11 is different, the point mark P irradiated to the table 11 and the cloth C has almost the same brightness.

  On the other hand, if the angle of the marking light angle adjusting motor 33 is equal to or larger than the limit angle (step S52; Yes), the first marking light 31 is turned off (step S56), and the process proceeds to step S106.

  Then, as the first marking light 31 moves to a predetermined angle, the marking light angle adjustment motor 33 stops (step S106).

Next, the CPU 61 controls the operation of each part of the sewing machine, and executes sewing related to predetermined bead stitching (step S107). The sewing operation of the bead stitching sewing machine 10 is the same as that conventionally known and will not be described in detail here.
Then, after the sewing is completed, the CPU 61 stops each part of the sewing machine such as turning off the first marking light 31 and the second marking light 32 (step S108), and ends the sewing process.

As described above, the marking irradiation device 30 in the edge stitch sewing machine 10 switches the light emission output in accordance with the angle of the first marking light 31 with respect to the table 11 to determine which angle of the first marking light 31 is. Even at such an angle, the point marks P irradiated to the table 11 and the cloth C on the table 11 can be set to have substantially the same brightness.
Even when the set position (reference position) of the body cloth C differs depending on the type of sewing and the type of the sewing object, the point mark P (slit light P1) indicating the set position (reference position) is different. ) Are represented with the same lightness, the body cloth C can be aligned in the same manner with respect to the point mark P at any position.
That is, even when the position of the point mark P differs depending on the type of sewing and the type of the sewing product, the marking mark irradiation device 30 of the sewing machine always displays the point mark P in the same form. Therefore, the alignment of the body cloth C with respect to the same point mark P is stabilized, and the reproducibility of the sewing finish can be stabilized.

The present invention is not limited to the above embodiment.
For example, as shown in FIG. 9, the light amount adjusting device as the light amount adjusting means may be a filter 37 that physically limits the amount of light passing therethrough.
The filter 37 is a member exhibiting a substantially arc shape in a side view, which is provided over a range in which the first marking light 31 can irradiate light and corresponds to a rotatable angle.
The filter 37 is made of, for example, a light-transmitting material that is darkly colored at the center side and is subjected to a gradation process in which the color becomes lighter toward both ends, and the first marking light 31 emits light with the same output. In addition, from the angle at which the first marking light 31 irradiates the point mark P (slit light P1) in a substantially vertical direction toward the table 11, the amount of light transmitted through the filter increases as the irradiation angle becomes shallower. Thus, the brightness of the point mark P (slit light P1) on the table 11 is substantially the same.

  The filter 37 is not limited to a light-transmitting material colored in a gradation. For example, the filter 37 is formed of a light-shielding material and has a substantially arc shape in a side view as it goes from the center to both ends. A member in which a plurality of slits are formed so as to increase the number and width of the slits may be used.

  In the above embodiment, the light amount adjustment data 63a is read from the memory 63 and the specified voltage value (Vc) for performing light emission according to the angle of the first marking light 31 is acquired. The invention is not limited to this, and the specified voltage value (Vc) may be calculated from the angle of the first marking light 31 by a predetermined mathematical formula.

  In the above embodiment, if the angle of the marking light angle adjusting motor 33 acquired for adjusting the angle of the first marking light 31 is equal to or larger than the limit angle, the first marking light 31 is turned on. In this case, the reference position may be indicated by using a predetermined scale.

  In addition, it is needless to say that other specific detailed structures can be appropriately changed.

It is a perspective view which shows the schematic structure of the whole edge stitch sewing machine. It is a front view of a bead stitch sewing machine. It is the perspective view which expanded and showed each structure of the marking irradiation apparatus. It is the arrangement explanatory view which showed the irradiation position of a point mark, arrangement of two sewing needles, a moving knife, and one corner knife in plan view. It is a block diagram which shows the control system regarding the marking irradiation apparatus in a bead stitch sewing machine. It is explanatory drawing which shows the principal part structure of the circuit regarding a light quantity adjustment apparatus. It is a flowchart which shows the light quantity adjustment process in a marking irradiation apparatus. It is a flowchart which shows the subroutine in the light quantity adjustment process of a marking irradiation apparatus. It is explanatory drawing which shows the filter which is a modification of a light quantity adjustment apparatus. It is a graph which shows general light intensity distribution.

Explanation of symbols

10 Sewing machine (sewing machine)
11 Table (mounting table)
30 Marking irradiation device 31 First marking light (light emitting part)
32 Second marking light (light emitting part)
33 Marking light angle adjustment motor (angle adjustment means)
36 Light quantity adjustment device (light quantity adjustment means)
37 Filter (Light intensity adjustment means)
60 Operation control means 61 CPU
62 Program memory 63 Memory C Body cloth (cloth)
P Point mark P1, P2 Slit light

Claims (3)

A reference for alignment of the fabric placed on the placement table by the light emission from the light emitting portion, which is disposed above the placement table on which the fabric to be sewn in the sewing machine is placed. A marking irradiation apparatus for a sewing machine that irradiates a point mark at a position,
An angle adjusting means for switching the irradiation angle of the light emitting unit according to the position of the reference position;
A light amount adjusting means for adjusting the light amount output by the light emitting unit according to the irradiation angle of the light emitting unit switched by the angle adjusting unit,
The sewing light marking irradiation apparatus characterized in that the light amount adjusting means adjusts the light amount so that the light amount increases corresponding to a change in the irradiation angle of the light emitting unit so as to move away from a vertical direction facing the mounting table. .   2. The light amount adjusting unit performs adjustment to turn off the light emitting unit when an irradiation angle of the light emitting unit switched by the angle adjusting unit exceeds an angle of a predetermined limit. The marking irradiation apparatus of the sewing machine described in 1.   3. The marking irradiation apparatus for a sewing machine according to claim 1, wherein the sewing machine is a bead stitch sewing machine that performs bead stitching on the fabric.