Sewing machine

Abstract

The invention provides a sewing machine which can properly prompt the sewing range. The marking device is equipped with a marking lamp (50) for irradiating slit light (L) to a needle dropping position, and the marking lamp is provided with a light emitting part for emitting the slit light; a first shielding body (54) that shields one end of the slit light; and a second shielding body (55) which shields the other end portion of the slit light, the first shielding body is movable, the shielding range of the one end portion can be adjusted along the long side direction of the slit light irradiated to the needle dropping position, and the second shielding body is movable, the shielding range of the other end portion can be adjusted along the long side direction of the slit light irradiated to the needle dropping position.

Description

TECHNICAL FIELD

[0001] The present application relates to a sewing machine provided with a marker light. BACKGROUND

[0002] If the sewing machine lifts the presser foot upward to become a released state, and places a workpiece on the needle plate, the needle hole is covered, so it is difficult to accurately grasp the position of the workpiece to be sewn.

[0003] Therefore, in order to solve the above problems, a marker light is mounted in the sewing machine, which irradiates the position of the workpiece placed on the needle plate to be sewn (for example, refer to Patent Document 1).

[0004] PRIOR ART DOCUMENT

[0005] PATENT DOCUMENT

[0006] Patent Document 1: Japanese Realization Hei 02-126580 SUMMARY

[0007] (I) Technical problem to be solved

[0008] However, the above marker light only indicates the position with respect to the position of the sewing.

[0009] Therefore, for example, in the case of sewing where the range to be sewn has been determined, it is not possible to appropriately indicate the range.

[0010] The purpose of the present application is to appropriately indicate the range to be sewn.

[0011] (II) Technical solution

[0012] The present application is a sewing machine characterized by being provided with a marker light that irradiates slit light to a needle drop position,

[0013] The marker light is provided with:

[0014] a light emitting portion that emits slit light;

[0015] a first shielding body that shields one end portion of the slit light; and

[0016] a second shielding body that shields the other end portion of the slit light,

[0017] The first shielding body is movable and can adjust the shielding range of the one end portion in the longitudinal direction of the slit light irradiated to the needle drop position,

[0018] The second shielding body is movable and can adjust the shielding range of the other end portion in the longitudinal direction of the slit light irradiated to the needle drop position.

[0019] (3) Advantageous Effects

[0020] The marker light of the present application not only appropriately indicates the position at which sewing is to be performed, but also appropriately indicates the range at which sewing is to be performed. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a side view of a sewing machine that is an embodiment of the invention.

[0022] Figure 2 is a block diagram showing the overall structure of a sewing machine.

[0023] Figure 3 is a perspective view of the face side of a sewing machine.

[0024] Figure 4 is a cross-sectional view along a cross section parallel to the optical axis of the slit light in the marker light and the X-axis direction.

[0025] Figure 5 (A) of is a diagram showing irradiation light in which the right end portion of the slit light is shielded and the length from the intermediate position is shortened, Figure 5 (B) of is a diagram showing an example in which the left end portion of the slit light is shielded and the length from the intermediate position is shortened.

[0026] Figure 6 is a display example of a setting screen for performing reinforcement sewing (Japanese: shimegime niuri) that is displayed on the display portion of the operation input portion.

[0027] Figure 7 is an example of a sewing pattern, and is an explanatory diagram showing a setting item in the sewing pattern.

[0028] BRIEF DESCRIPTION OF DRAWINGS

[0029] 10: sewing machine frame; 14: face cover; 50: marker light; 52: light source; 53: light shield; 54: first shielding body; 55: second shielding body; 56: frame; 569, 569: fastening screw; 58: first motor; 59: second motor; 90: control device; 91: CPU; 94: data storage; 96: operation input portion; 100: sewing machine; 941: pattern data; 961: display portion; G1: setting screen; K1: selection key; K2: increase / decrease key; K3: determination key; L: slit light; Pc: intermediate position; Pl: dimension; Pw: dimension. DETAILED DESCRIPTION

[0030] [SUMMARY OF EMBODIMENT]

[0031] Embodiments of the present application are described based on the drawings.

[0032] As the sewing machine 100 of the present embodiment, a so-called lock stitch sewing machine (Japanese: shachime misin) is exemplified.

[0033] Figure 1 is a side view of the sewing machine 100, Figure 2 is a block diagram showing the overall structure, Figure 3 is a perspective view of the face side of the sewing machine 100.

[0034] The sewing machine 100 has a needle up-down movement mechanism 20 that performs up-down movement of a needle bar 24 that holds a sewing needle, a presser foot mechanism 40 that presses a workpiece and can be positioned arbitrarily on a plane along a needle plate, a marker lamp 50, a control device, and a sewing machine frame 10 that supports the entire sewing machine.

[0035] In addition, the sewing machine 100 has a thread regulator device, a thread tension lever mechanism, and a thread cutting device that a general sewing machine has, but they are the same as the known structures, so the description is omitted.

[0036] Further, in the following description, the direction that coincides with the vertical up-down direction in the state where the sewing machine 100 is disposed on a horizontal plane is set as the Z-axis direction, one direction that is orthogonal to each other on the horizontal plane is set as the X-axis direction (the direction of the paper surface perpendicular to Figure 1 ), and the other direction is set as the Y-axis direction (the left-right direction of the paper surface perpendicular to Figure 1 ). In addition, sometimes the end portion side of the Y-axis direction (the left side of the paper surface perpendicular to Figure 1 ) is called "front", the other end portion side of the Y-axis direction (the right side of the paper surface perpendicular to Figure 1 ) is called "rear", the end portion side of the X-axis direction (the left side of the paper surface perpendicular to Figure 4 ) is called "left", and the other end portion side of the X-axis direction (the right side of the paper surface perpendicular to Figure 4 ) is called "right".

[0037] [Sewing machine frame]

[0038] The sewing machine frame 10 has a sewing machine base portion 11 that extends along the Y-axis direction at the lower portion of the sewing machine 100, an upright body portion 12 that stands vertically from one end portion of the sewing machine base portion 11, and a sewing machine arm portion 13 that extends from the upper end portion of the upright body portion 12 in the same direction as the sewing machine base portion 11.

[0039] The entire sewing machine frame 10 is covered by a sewing machine cover. In addition, a part of the sewing machine cover can be opened and closed to access the inside of the sewing machine cover.

[0040] For example, a face cover 14 that can be opened and closed via a hinge is provided at the face portion at the front end of the sewing machine arm portion 13. The marker lamp 50 is housed in the inside space formed by the face cover 14.

[0041] In order to mark the needle plate lower surface with the slit light L indicating the sewing position and the sewing range, a cutout 141 is formed in the lower end of the face cover 14 so as not to shield the slit light L. That is, even in the state where the face cover 14 is closed, the marking lamp 50 can irradiate the slit light L onto the needle plate or the lower plate 41 described later.

[0042] [Needle up-and-down movement mechanism]

[0043] The needle up-and-down movement mechanism has a sewing machine motor 21, an upper shaft (not shown) that is rotationally driven by the sewing machine motor 21, a needle bar 24 that supports the needle 22 at the lower end, and a crank mechanism that converts the rotational motion of the upper shaft into a reciprocating motion in the Z-axis direction to be imparted to the needle bar 24.

[0044] [Movement mechanism]

[0045] The movement mechanism 40 has a lower plate 41 that is placed on the plane along the X-Y plane of the sewing machine base portion 11, a support frame 42 that is vertically provided on the upper surface of the rear end of the lower plate 41, a reinforcing frame 47 that is supported on the front end of the front side extension of the support frame 42 in a manner capable of ascending and descending, a presser foot lifting motor 31 that performs the ascending and descending motion of the reinforcing frame 47, and an X-axis motor 43 and a Y-axis motor 44 that move the reinforcing frame 47 in the X-axis direction and the Y-axis direction arbitrarily via the lower plate 41 and the support frame 42.

[0046] The reinforcing frame 47 is positioned above the needle plate on the upper surface of the sewing machine base portion 11. In addition, a rectangular opening that is long in the X-axis direction is formed through the reinforcing frame 47, and sewing is performed on the inside of the opening. The position of the lower plate 41 corresponding to the opening of the descending reinforcing frame 47 is opened to the same degree as the opening, and the work to be sewn is held by the descending reinforcing frame 47 and the lower plate 41, and sewing based on the drop needle can be performed in this held state.

[0047] The Y-axis motor 44 imparts a movement motion to the lower plate 41 in the Y-axis direction by an arbitrary movement amount. The X-axis motor 43 can impart a rotational motion around the Z-axis with the rear end of the lower plate 41 as the axis, and move and position the front end of the lower plate 41 and the reinforcing frame 47 in the X-axis direction.

[0048] By the cooperation of these X-axis motor 43 and Y-axis motor 44, the reinforcing frame 47 is arbitrarily positioned in the X-Y plane, and reinforcing sewing can be performed in accordance with a certain sewing pattern.

[0049] [Kettle mechanism]

[0050] Although not shown in the figure, the kettle mechanism comprises a kettle located below the needle plate of the sewing machine base 11; a kettle shaft that rotationally drives the kettle; and a transmission mechanism that transmits rotational power from the upper shaft to the kettle shaft. While the kettle can be a vertical, fully rotating kettle, a horizontal kettle, or a semi-rotating kettle, a vertical, fully rotating kettle is used here. The transmission mechanism can be a belt mechanism or a gear mechanism using bevel gears. The transmission mechanism transmits the upper shaft's rotation at twice the speed to the kettle.

[0051] [Marker Light]

[0052] As described above, the marker light 50 is provided on the face portion of the sewing machine arm 13 and housed inside the face cover 14 .

[0053] Figure 4 It is a cross-sectional view taken along a cross section parallel to the optical axis of the slit light L in the marker light 50 and the X-axis direction.

[0054] The marker light 50 includes: a light-emitting portion, which is composed of a light source 52 that uses an LED 51 to emit parallel light and a mask 53 that blocks a portion of the parallel light to form a slit light L; a first shielding body 54 that blocks one end (the left end) of the slit light L; a second shielding body 55 that blocks the other end (the right end) of the slit light L; and a frame 56 that supports the light-emitting portion, the first shielding body 54, and the second shielding body 55.

[0055] The frame 56 is fixedly supported on the front surface of the face of the sewing machine arm 13 .

[0056] The frame 56 is in the shape of a rectangular parallelepiped elongated in the X-axis direction and has a through hole 561 extending vertically therethrough. The light source 52 is mounted downwardly at the upper end of the through hole 561, and parallel light is projected downwardly through the through hole 561.

[0057] Furthermore, the optical axis of the light source 52 and the center line of the through hole 561 of the frame 56 are both strictly inclined downward and rearward, in a direction that allows the needle drop position (pinhole) on the needle plate to be illuminated from the face.

[0058] The light shielding sheet 53 is a flat plate having a slit hole 531 formed therein along the X-axis direction. The light shielding sheet 53 is disposed in the through hole 561 of the frame 56 just below the light source 52 and slits parallel light. Figure 5 (A) and Figure 5 (B) shows the slit light L irradiated onto the pin plate. In these figures, a region where a portion of the longitudinal direction of the slit light L is shielded by the first shielding body 54 or the second shielding body 55 is indicated by a dotted line.

[0059] The slit light L irradiated through the light shielding sheet 53 is parallel to the X-axis direction as shown in the figure, and the slit hole 531 is processed so as to form a short-axis light along the Y-axis direction at the middle position Pc in the long-side direction in a state not shielded by the first shielding body 54 or the second shielding body 55. Also, the position of this short-axis light is the position of the pinhole.

[0060] On each of the left and right side surfaces of the frame body 56, an insertion hole 562, 563 of the first shielding body 54 and the second shielding body 55 reaching the through-hole 561 from the side surface along the X-axis direction is formed. The cross-sectional shape of the first shielding body 54 and the second shielding body 55 and the insertion hole 562, 563 is not particularly limited and is the same for each. These cross-sectional shapes are circular if rotated, and thus are preferably a shape other than this. Here, a case where the cross-section is substantially quadrangular is exemplified.

[0061] The front end portions of the first shielding body 54 and the second shielding body 55 inserted into the insertion hole 562, 563 shield one end portion and the other end portion of the slit light L, respectively. The deeper the insertion depth of the first shielding body 54 and the second shielding body 55 with respect to the insertion hole 562, 563, the longer the range of the corresponding end portion side of the slit light L is shielded, and thus the corresponding end portion side of the slit light L irradiated onto the pinboard is shortened.

[0062] Figure 5 (A) is a state where the right end portion of the slit light L is shielded by the second shielding body 55, Figure 5 (B) is a state where the left end portion of the slit light L is shielded by the first shielding body 54.

[0063] The first shielding body 54 can adjust the length of the left end portion of the irradiated slit light L (the length from the middle position Pc) by adjusting the insertion depth with respect to the insertion hole 562. Similarly, the second shielding body 55 can adjust the length of the right end portion of the irradiated slit light L (the length from the middle position Pc) by adjusting the insertion depth with respect to the insertion hole 562.

[0064] In addition, the first shielding body 54 and the second shielding body 55 each have a shape where the front end portion of the insertion side is a sharp wedge shape as viewed from the front. That is, the first shielding body 54 and the second shielding body 55 have a shape where the thickness in the direction of the optical axis of the slit light L becomes thinner toward the front end portion.

[0065] Therefore, the thinnest front end portion of the first shielding body 54 and the second shielding body 55 shields the end portion of the slit light L, and thus clear definition of the end portion of the irradiated slit light L can be achieved.

[0066] Further, first threaded holes 564, 564 orthogonal to each of the insertion holes 562, 563 and reaching each of the insertion holes 562, 563 from the lower surface of the frame body 56 are formed in the frame body 56. Springs 567, 567 are housed in the first threaded holes 564, 564 and are sealed with screws 565, 565, and the springs 567, 567 are in pressure contact with the first shield 54 and the second shield 55 inserted into each of the insertion holes 562, 563.

[0067] By the pressure contact of each of the springs 567, 567, the first shield 54 and the second shield 55 can be retained in each of the insertion holes 562, 563. The springs 567, 567 can have an elastic force to the extent that does not hinder the position adjustment of the insertion direction of the first shield 54 and the second shield 55.

[0068] Further, the first threaded holes 564, 564 are formed from the lower surface of the frame body 56, but can be formed from any direction as long as they are orthogonal to each of the insertion holes 562, 563.

[0069] Further, on the front surface of the frame body 56, second threaded holes 568, 568 reaching each of the insertion holes 562, 563 from the front surface of the frame body 56 are formed orthogonal to each of the insertion holes 562, 563. Fastening screws 569, 569 as fastening members are screwed into the second threaded holes 568, 568, and the front end portions of each of the fastening screws 569, 569 are in pressure contact with the first shield 54 and the second shield 55, respectively, and are held in the adjusted positions. The second threaded holes 568, 568 and the fastening screws 569, 569 constitute a holding mechanism that holds the first shield 54 and the second shield 55 in the moved positions, respectively, fixedly.

[0070] Each of the fastening screws 569, 569 can be a screw of a type that is fastened with a tool such as a bolt, but a screw having a knurled portion after processing, a wing screw, or the like that can be fastened by hand is preferable.

[0071] Further, the second threaded holes 568, 568 are formed from the front surface of the frame body 56, but can be formed from any direction other than the rear as long as they are orthogonal to each of the insertion holes 562, 563.

[0072] Further, a sharp claw member can be provided at the front end portion of the spring 567, 567 disposed in the first threaded hole 564, 564, and a plurality of fine grooves arranged in the longitudinal direction of the side surface of the first shield 54 and the second shield 55 in pressure contact with the claw member can be provided, and the claw member and each of the grooves can be engaged to constitute a latch mechanism that can position the first shield 54 or the second shield 55 in the X-axis direction.

[0073] In this case, since the latching mechanism functions as the holding mechanism, the holding mechanism composed of the second threaded holes 568, 568 and the fastening screws 569, 569 can be omitted.

[0074] Alternatively, instead of the structure of the first threaded holes 564, 564 and the springs 567, 567, a rack gear can be formed along the long side direction of the side surface of the first shield 54 and the second shield 55, and an operation section such as a knob for rotating a pinion gear engaged with the rack gear by hand can be provided to adjust the positions of the first shield 54 and the second shield 55.

[0075] Alternatively, a worm gear can be engaged with the rack gear, and an operation section such as a knob for rotating the worm gear by hand can be provided to adjust the positions of the first shield 54 and the second shield 55.

[0076] In the case of the structure using the pinion gear, the holding mechanism composed of the second threaded holes 568, 568 and the fastening screws 569, 569 is preferably provided, but in the case of the structure using the worm gear, the rack gear can be restrained, so that the holding mechanism composed of the second threaded holes 568, 568 and the fastening screws 569, 569 can be omitted.

[0077] In addition, in the case of using the rack-pinion mechanism or the rack-worm mechanism, the pinion gear or the worm gear can be driven by a motor. In addition, in the case of being driven by a motor, a ball screw mechanism can be used instead of the rack-pinion mechanism or the rack-worm mechanism.

[0078] In addition, an actuator of a linear motion system such as a linear motor can be used to omit the gear mechanism, and the first shield 54 and the second shield 55 can be moved and positioned in the X-axis direction, respectively.

[0079] In Figure 2 , the motor for adjusting the position of the first shield 54 in the X-axis direction is illustrated as a first motor 58, and the motor for adjusting the position of the second shield 55 in the X-axis direction is illustrated as a second motor 59. Further, of course, in the case where the first shield 54 and the second shield 55 are manually adjusted in the X-axis direction, these motors 58, 59 can be omitted.

[0080] [Threader mechanism]

[0081] In addition, the sewing machine 100 is provided with a threader mechanism, a thread regulator, a thread cutter, and the like, which are provided in a general sewing machine, but they are well-known structures, so detailed descriptions thereof are omitted.

[0082] The thread take-up lever mechanism in the sewing machine 100 is a structure that is powered from the sewing machine motor 21 of the needle up-down moving mechanism 20, and makes the thread take-up lever act in synchronization with the up-down movement of the needle bar 24.

[0083] [Control system of sewing machine]

[0084] As shown in Figure 2 The sewing machine 100 has a control device 90 that performs the action control of each structure. Also, the sewing machine motor 21, the presser foot lifting motor 31, the X-axis motor 43, and the Y-axis motor 44 are connected to the control device 90 via respective motor drive circuits 21a, 31a, 43a, and 44a.

[0085] In addition, encoders 23, 33, 45, and 46 that detect the shaft angle of the output shaft are attached to the sewing machine motor 21, the presser foot lifting motor 31, the X-axis motor 43, and the Y-axis motor 44. These encoders 23, 33, 45, and 46 are also connected to the control device 90 via the motor drive circuits 21a, 31a, 43a, and 44a.

[0086] In addition, in the case where the marker lamp 50 is configured to have the above-described first motor 58 and the second motor 59, these motors 58 and 59 are also connected to the control device 90 via respective motor drive circuits 58a and 59a. In addition, encoders 581 and 591 that detect the shaft angle of the output shaft are attached to the respective motors 58 and 59. In addition, in the case where the first motor 58 and the second motor 59 are provided as pulse motors to drive the first motor 58 and the second motor 59 based on the amount of action of the command from the control device 90, the encoders 581 and 591 can also be omitted.

[0087] The control device 90 has a CPU 91, a ROM 92, a RAM 93, and a data storage 94, and performs various action controls described later.

[0088] The ROM 92 stores a basic system program.

[0089] In addition, a pattern data 941 for performing sewing of a predetermined reinforcement-based sewing pattern is stored in the data storage 94. Furthermore, the data storage 94 is configured from a nonvolatile semiconductor memory such as a flash memory, an EEPROM, or an EPROM, but a memory device such as an HDD can also be used.

[0090] The CPU 91 executes a control program and performs sewing action control based on the pattern data 941. The RAM 93 is a memory that serves as a work area of the CPU 91.

[0091] In addition, an operation input 96 that is a setting input device is connected to the control device 90 via an interface 96a.

[0092] The operation input section 96 is provided with a display section 961 and an input section arranged around it.

[0093] The operation input section 96 can be constituted by a so-called touch panel or touch screen provided with a touch sensor at the display section 961.

[0094] Figure 6 A state in which a setting screen Gl for reinforcing sewing is displayed on the display section 961 of the operation input section 96 is shown.

[0095] The reinforcing sewing pattern described above is various, and pattern data 941 is prepared for each of the reinforcing sewing patterns.

[0096] For example, a general reinforcing in which one or more times of sewing is performed linearly over the entire width in the X-axis direction of a sewing pattern and sewing is performed zigzag over the entire width in the X-axis direction in a superimposed manner thereon, a line reinforcing in which linear sewing is repeatedly performed over the entire width in the X-axis direction of a sewing pattern, and the like can be cited.

[0097] In the setting screen Gl, the pattern of the currently selected sewing pattern and its data number, the size of the X-axis direction of the set sewing pattern, the size of the Y-axis direction of the sewing pattern, the sewing speed, and the like are displayed.

[0098] In addition, the operation input section 96 is provided with a selection key Kl of the data number or the kind of the set parameter, an increase / decrease key K2 of the set value, a confirmation key K3 of the set content, and the like.

[0099] Figure 7 is an explanatory view showing a set parameter in the sewing pattern, and is an example of the sewing pattern.

[0100] The set parameters that can be set from the operation input section 96 are, in addition to the selection of the kind of the sewing pattern, the size Pl of the X-axis direction of the sewing pattern, the size Pw of the Y-axis direction of the sewing pattern, the sewing speed, the length Pl 1 from the middle position Pc serving as a reference of the X-axis direction of the sewing pattern to one end portion (left end portion) in the X-axis direction of the sewing pattern, the length Pl2 from the middle position Pc serving as a reference of the X-axis direction of the sewing pattern to the other end portion (right end portion) in the X-axis direction of the sewing pattern, and the like.

[0101] In addition, the middle position Pc serving as a reference coincides with a position that becomes directly below the needle when the sewing object is held in the reinforcing frame 47 at the time of the start of sewing.

[0102] If the kind of the sewing pattern and the values of the above-described parameters are set, they are registered as one pattern data 941 in the data storage 94.

[0103] In addition, a pedal 95 is connected to the control device 90 via an interface 95a, and the start and stop of sewing and other instructions are input by a stepping operation. However, the pedal 95 is not essential in the sewing machine 100, and can be omitted from the structure.

[0104] [Seaming action based on the sewing machine (1)]

[0105] The structure of manually adjusting the positions of the first shield 54 and the second shield 55 of the marker light 50 will be described.

[0106] First, the operator of the sewing machine selects the pattern data 941, and grasps the length Pl 1 from the middle position Pc to one end of the seaming pattern in the X-axis direction and the length Pl 2 from the middle position Pc to the other end of the seaming pattern in the X-axis direction, based on the set contents of the pattern data 941 displayed on the display section 961.

[0107] Then, the face cover 14 is opened, and the respective fastening screws 569, 569 of the marker light 50 are loosened, and the first shield 54 and the second shield 55 are moved in the X-axis direction.

[0108] If the first shield 54 is moved to the right, as shown in (B) of FIG. 6, the left end of the slit light L is shielded, and the length from the middle position Pc is shortened. Similarly, if the second shield 55 is moved to the left, as shown in (A) of FIG. 6, the right end of the slit light L is shielded, and the length from the middle position Pc is shortened. Figure 5 Figure 5

[0109] Therefore, the first shield 54 and the second shield 55 are positioned so that the set value of the length Pl 1 from the middle position to one end of the seaming pattern and the set value of the length Pl 2 from the middle position to the other end of the seaming pattern are obtained, and the positions of the first shield 54 and the second shield 55 are fixed by the fastening of the respective fastening screws 569, 569.

[0110] If the face cover 14 is closed and the reinforcement frame 47 is raised by the operation of the pedal 95, the CPU 91 of the control device 90 of the sewing machine 100 causes the LED 51 of the marker light 50 to emit light, and the slit light L whose left and right ends are adjusted to predetermined lengths is irradiated onto the needle plate (or the lower plate 41) in accordance with the settings of the selected pattern data 941.

[0111] The operator configures the seaming object on the needle plate while observing the irradiation position of the slit light L, and steps on the pedal 95 to start seaming.

[0112] ​​According to the depression of the pedal 95, the CPU 91 turns off the LED 51 of the marker lamp 50, controls the presser lifting motor 31 to lower the reinforcing frame 47, and holds the work to be sewn by the lower plate 41 and the reinforcing frame 47.

[0113] Further, the CPU 91 starts the rotational drive so that the sewing machine motor 21 becomes the set sewing speed, and controls the X-axis motor 43 and the Y-axis motor 44 in accordance with the set values of the class and the parameters of the sewing pattern set in the pattern data 941, to sequentially feed the work to be sewn to the set respective needle drop positions, and performs reinforcing sewing.

[0114] Further, if the sewing is completed for all the needle drop positions, the sewing machine motor 21 is stopped, and the reinforcing frame 47 is raised to release the work to be sewn. In addition, in the case of being provided with a thread cutting device, the thread cutting is performed before the release of the work to be sewn.

[0115] Further, although the control example of turning off the LED 51 of the marker lamp 50 at the start of the sewing is shown, the LED 51 can be turned on during the sewing to continue the irradiation of the slit light L.

[0116] [Seam sewing operation based on the sewing machine (2)]

[0117] The structure in which the first motor 58 and the second motor 59 that move the positions of the first shield 54 and the second shield 55 of the marker lamp 50 are provided is described.

[0118] First, if the operator of the sewing machine selects the pattern data 941, the CPU 91 acquires the length Pl 1 from the middle position Pc to one end portion of the X-axis direction of the sewing pattern and the length Pl 2 from the middle position Pc to the other end portion of the X-axis direction of the sewing pattern.

[0119] Accordingly, the CPU 91 drives the first motor 58 in accordance with the set value of the length Pl 1 from the middle position to one end portion of the sewing pattern, positions the first shield 54 at the position that shields one end portion of the slit light L, so that the length from the middle position Pc to one end portion of the sewing pattern is Pl 1.

[0120] Similarly, the CPU 91 drives the second motor 59 in accordance with the set value of the length Pl 2 from the middle position Pc to the other end portion of the sewing pattern, positions the second shield 55 at the position that shields the other end portion of the slit light L, so that the length from the middle position Pc to the other end portion of the sewing pattern is Pl 2.

[0121] Further, the control device 90 preferably prepares in advance in the data storage 94, respectively, a table of data of the correspondence relation of the set value of the length Pl 1 and the amount of action of the first motor 58 for moving the first shield 54 to the appropriate position in correspondence therewith, and a table of data of the correspondence relation of the set value of the length Pl 2 and the amount of action of the second motor 59 for moving the second shield 55 to the appropriate position in correspondence therewith.

[0122] The CPU 91, when performing the action control of the first motor 58 and the second motor 59, refers to the respective table data, and performs the positioning action of the first shield 54 and the second shield 55.

[0123] Then, the CPU 91 of the control device 90 of the sewing machine 100 causes the LED 51 of the marker lamp 50 to be lit, and causes the slit light L of which the left and right end portions are adjusted to the predetermined length to be irradiated onto the needle plate (or the lower plate 41) in accordance with the setting of the selected pattern data 941. Further, the face cover 14 can be kept closed at all times.

[0124] The operator, while observing the irradiation position of the slit light L, arranges the material to be sewn on the needle plate, steps on the pedal 95, and starts sewing.

[0125] The action of the sewing machine 100 thereafter is the same as that of the sewing action (1) based on the sewing machine, and thus the description is omitted.

[0126] [Technical Effects of the Sewing Machine]

[0127] The marker lamp 50 of the sewing machine 100 is provided with the first shield 54 that shields one end portion of the irradiated slit light L and the second shield 55 that shields the other end portion of the slit light L, the first shield 54 is movable and can adjust the shielding range of the one end portion in the longitudinal direction of the slit light L irradiated toward the drop position, and the second shield 55 is movable and can adjust the shielding range of the other end portion in the longitudinal direction of the slit light L irradiated toward the drop position.

[0128] Therefore, even in the state where the reinforcing frame 47 is retracted upward, it is possible to recognize the sewing position with respect to the material to be sewn by the irradiation position of the slit light L, and it is also possible to recognize the range in which sewing is performed depending on the length of the slit light L.

[0129] Therefore, the operator can arrange the material to be sewn at the appropriate position, and can accurately perform reinforcing sewing at the position as the target.

[0130] Further, the marker lamp 50 is housed inside the face cover 14 provided to the sewing machine cover. Therefore, it is possible to avoid the marker lamp 50 being arranged in the exposed state outside the sewing machine 100, the marker lamp 50 does not become an obstacle, and it is possible to achieve the improvement of the workability of sewing.

[0131] In addition, the front end portions of the slit light L are sharpened in a manner that the thickness in the traveling direction of the slit light is thinned, and thus the end portions of the irradiated slit light are not blurred, and clear slit light can be irradiated.

[0132] In addition, since the holding mechanism that holds the first and second shielding bodies 54 and 55 at the positions after the movement is provided, the positional deviation of the first and second shielding bodies 54 and 55 due to the disturbance of the sewing work or the like can be suppressed, and even if the reinforcing sewing is repeatedly performed, the slit light L can be irradiated at the appropriate position for a long time.

[0133] The holding mechanism of the first and second shielding bodies 54 and 55 can appropriately hold the positions of the first and second shielding bodies 54 and 55 by a simple structure and a simple operation in a case where the holding mechanism is configured to have a fastening screw 569, 569 that fixes the first or second shielding body 54 or 55 by a manual operation.

[0134] In addition, in a case where the marker lamp 50 is configured to have the first motor 58 that moves and positions the first shielding body 54 to an arbitrary position and the second motor 59 that moves and positions the second shielding body 55 to an arbitrary position, the positional adjustment of the first and second shielding bodies 54 and 55 can be appropriately performed by the motor control.

[0135] Further, the CPU 91 of the control device 90 controls the first and second motors 58 and 59 based on the pattern data 941 that is the setting data in which the range and the size in which the sewing is performed are determined, and adjusts the shielding range of one end portion and the shielding range of the other end portion in the long side direction of the slit light L in the range corresponding to the pattern data 941.

[0136] Therefore, if various parameters are set with respect to the pattern data 941 or the pattern data 941 in which the parameters are already set is prepared, the operator does not have to perform the adjustment work, and the lengths of the both end portions of the slit light L can be appropriately adjusted.

[0137] Therefore, the workability of the sewing machine can be improved, and appropriate reinforcing sewing can be performed.

[0138] [Others]

[0139] The above describes the embodiments of the present application. However, the present application is not limited to the above-described embodiments. For example, in the embodiments, the constituent elements integrally formed by a single member can be replaced by constituent elements split into a plurality of members and fixed to each other. In addition, the constituent elements constituted by linking a plurality of members can be replaced by constituent elements integrally formed by a single member. Furthermore, the details shown in the embodiments can be appropriately changed within the scope not departing from the gist of the present application.

[0140] For example, although the structure of mounting the marker lamp 50 of the above-described structure on the topstitch sewing machine is exemplified, the marker lamp 50 can be applied to all sewing machines contributing to the alignment of the sewn article by irradiating the slit light L adjusted to an arbitrary length, not limited to the topstitch sewing machine.

[0141] For example, the welting sewing machine, the buttonhole overlock sewing machine, the round buttonhole overlock sewing machine, and the like sew within the range of the target length, and thus the marker lamp 50 can appropriately indicate the range and position of the sewing using the slit light.

Claims

1. A sewing machine characterized by comprising: The marker lamp includes a light-emitting portion that emits slit light toward a needle drop position, The marker lamp includes: a light-emitting portion that emits slit light; a first shielding body that shields one end portion of the slit light; and a second shielding body that shields the other end portion of the slit light, The first shielding body is movable and can adjust a shielding range of the one end portion in a long side direction of the slit light that is emitted toward the needle drop position, The second shielding body is movable and can adjust a shielding range of the other end portion in the long side direction of the slit light that is emitted toward the needle drop position.

2. The sewing machine of claim 1, wherein The marker lamp is housed inside a cover of a sewing machine.

3. The sewing machine of claim 1, wherein The first shielding body and the second shielding body are each sharpened in a manner that a thickness in a traveling direction of the slit light is thinned at a front end portion that shields the slit light.

4. The sewing machine of claim 1, wherein The marker lamp includes a holding mechanism that fixedly holds the first shielding body and the second shielding body at positions after movement.

5. The sewing machine of claim 4, wherein, The holding mechanism includes a fastening member that fixes the first shielding body or the second shielding body by manual operation.

6. The sewing machine of claim 1, wherein, The marker lamp includes a first motor that moves and positions the first shielding body at an arbitrary position and a second motor that moves and positions the second shielding body at an arbitrary position.

7. The sewing machine according to claim 6, wherein The marker lamp includes a control device that controls the first motor and the second motor, The control device controls the first motor and the second motor to adjust the shielding range of the one end portion and the shielding range of the other end portion in the long side direction of the slit light within a range corresponding to setting data that specifies a range or a size in which sewing is performed, based on the setting data.

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