JP2005312742A - Sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To fix an upper shaft in a state that the upper shaft becomes an arbitrary phase at the time of positioning without being powered by a power source. <P>SOLUTION: In a sewing machine 1 having the upper shaft 3 which is rotatably supported in a sewing machine frame 2 and which can be rotated and operated from outside, a sewing needle 5 coupled with the upper shaft 3 and vertically moving, a synchronous member so arranged as to operate synchronously with the vertical movement of the sewing needle 5 at the time of sewing, has a fixing means comprising a fixing screw or others for fixing to a rotational position where the upper shaft 3 is rotated and operated movably forward and backward relative to the sewing machine frame 2 when the upper shaft 3 is rotated and operated. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sewing machine that sews a workpiece by cooperation of a sewing needle that moves up and down by rotation of an upper shaft and a timing member that is arranged to operate in synchronization with the vertical movement of the sewing needle. .

  In the sewing machine, the sewing needle is moved up and down by rotating the upper shaft, the sewing needle and sewing hook, looper, etc. are interlocked to sew the thread on the cloth, etc., and the sewing needle and thread trimming cam are interlocked to cut the thread. Is common. A timing member such as a sewing machine hook, a looper, or a thread trimming cam is driven by rotation of a lower shaft that rotates in time with the upper shaft. On the other hand, in recent years, belts and couplings having a small mechanical loss due to friction are often used as a drive transmission mechanism in the drive unit including the upper shaft. In addition, the torque required for driving the drive unit is extremely small, coupled with the fact that the motor as a drive source has a smaller moment of inertia of the rotor than before.

By the way, the applicant of the present application has proposed that the upper shaft is fixed at an arbitrary phase by electrically controlling the motor when positioning the sewing needle and the timing member (see, for example, Patent Document 1). ). According to this sewing machine, since the upper shaft is fixed by the braking force of the motor, when aligning with the upper shaft of the timing member such as a sewing machine hook or thread trimming cam, the upper shaft is held with one hand, There is no need to temporarily fix the upper shaft with tape, and workability is improved.
JP-A-7-670

  However, the sewing machine cannot be aligned unless the power is turned on. If the position is visually adjusted when the power is not turned on, the friction of the drive system is small as described above, so if the operator touches the needle bar lightly or releases the hand from the needle bar. The upper shaft rotates and the needle bar moves. As a result, the operator is forced to perform the alignment work of the timing member in a state in which the hand is not released from the needle bar, and the alignment work is extremely complicated and cannot be performed accurately. there were.

  The present invention has been made in view of the above circumstances, and an object thereof is to fix the upper shaft in a state where the upper shaft is in an arbitrary phase at the time of alignment work without turning on the power. It is to provide a sewing machine that can be used.

  In order to achieve the above object, according to the first aspect of the present invention, an upper shaft that is rotatably supported by the sewing machine frame and can be rotated from the outside, a sewing needle that is connected to the upper shaft and moves up and down, In a sewing machine having a timing member arranged to operate in synchronization with the vertical movement of the sewing needle during sewing, the sewing machine can be moved forward and backward with respect to the machine frame when the upper shaft is rotated from the outside. And a fixing means for fixing the upper shaft at a rotational position where the upper shaft is rotated.

According to the first aspect of the present invention, it is possible to manually rotate the phase of the upper shaft without turning on the power, and to fix the upper shaft by the fixing means in this state. Thereby, for example, when aligning the timing member, which is arranged to operate in synchronization with the vertical movement of the sewing needle, such as a sewing machine hook or a thread trimming cam, with respect to the sewing needle, the operator can It is possible to adjust the position of the timing member while adjusting the phase to a desired level and mechanically fixing the upper shaft.
Therefore, since it is not necessary to temporarily fix the upper shaft by using one hand or tape, the operator can concentrate on the position adjustment of the timing member. In addition, since the upper shaft is accurately fixed, even if the operator touches the needle bar or the like during work, the phase of the upper shaft does not change and the work posture avoids interference with the needle bar or the like. Etc., and workability can be improved. Thus, since the burden on the operator is reduced, the accuracy of the alignment between the sewing needle and the timing member is improved.
Furthermore, alignment work can be performed without turning on the power, and power consumption can be reduced. Further, for example, the alignment operation can be performed even when the power supply is disconnected from the conveyance operation, which is extremely advantageous in practical use.

  According to a second aspect of the present invention, in the sewing machine according to the first aspect, the upper shaft is provided with a driven gear, and has an operation part for performing the rotation operation at one end part and the driven part at the other end part. An operating shaft provided with a drive gear so as to be engaged with and disengaged from the gear and supported so as to be able to advance and retreat in the axial direction; And an operation member configured to rotate the upper shaft, and the driving gear and the driven gear are engaged against the urging force of the urging portion by pressing the operation member. The rotational force of the operation portion that has been rotated is transmitted to the upper shaft so that the upper shaft can be rotated, and the fixing means includes a contact position that contacts the operation shaft, and a retracted position that is separated from the operation shaft. The drive gear and the slave. Characterized in that to prevent rotation of the operating shaft by a gear and the abutment positions in a state in mesh.

According to the second aspect of the present invention, in addition to the operation of the first aspect, when aligning the sewing needle and the timing member, the operator first grasps the operation portion and moves the operation shaft to the biasing portion. The drive gear and the driven gear are engaged with each other by being moved in one axial direction against the urging force. Since the upper shaft rotates when the operation unit is rotated in a state where the gears are engaged with each other, the operator can manually adjust the phase of the upper shaft. Since the operation shaft is constantly urged to the other in the axial direction by the urging portion, the drive gear and the driven gear are separated unless a force is applied to the operation shaft in one of the axial directions. During normal sewing, there is no problem with the rotation of the upper shaft.
In addition, the upper shaft is fixed together with the operation shaft by fixing the operation shaft by contacting the contact member with the driven gear and the drive gear meshed to adjust the phase of the upper shaft. Thus, by fixing the operation shaft, the number of parts of the fixing means can be reduced, and the operator can easily and accurately fix and release the operation shaft.

Thus, according to the present invention, it is possible to fix the upper shaft in a state where the upper shaft is in an arbitrary phase during alignment work without turning on the power. That is, the worker can concentrate on the position adjustment of the timing member, and is not forced to work posture to avoid interference with the needle bar or the like, so that workability can be improved. In addition, since the burden on the operator is reduced, the accuracy of alignment between the sewing needle and the timing member is improved.
Furthermore, the alignment operation can be performed without turning on the power, and the alignment operation can be performed even when not connected to the power source, which is extremely advantageous in practical use.

  1 to 5 show an embodiment of the present invention. FIG. 1 is a schematic explanatory view showing the overall configuration of the sewing machine, FIG. 2 is an internal explanatory view of the sewing machine showing an arrangement state of a drive unit fixing device, and FIG. Is a cross-sectional view of the drive unit fixing device, FIG. 4 is an internal explanatory diagram of the sewing machine showing a state where the upper shaft is fixed by the drive unit fixing device, and FIG. 5 is a cross-sectional view of the drive unit fixing device with the upper shaft fixed is there.

  As shown in FIG. 1, the sewing machine 1 includes a sewing machine frame 2 as a sewing machine frame whose outer shape is substantially U-shaped in a side view. The sewing machine frame 2 has a sewing machine arm portion 2a that extends in the front-rear direction and forms an upper portion of the sewing machine 1, and a sewing machine bed portion that extends in the front-rear direction and forms a lower portion of the sewing machine 1. An operation unit 9 of a drive unit fixing device 103 to be described later is exposed on the sewing machine arm unit 2a. In FIG. 1, the sewing machine bed portion is omitted for illustration.

  As shown in FIG. 2, the sewing machine 1 has an upper shaft 3 and a lower shaft (not shown) that are rotatable and extend in the front-rear direction. The upper shaft 3 is disposed inside the sewing machine arm portion 2a, and the lower shaft is disposed inside the sewing machine bed portion. The upper shaft 3 is connected to a motor (not shown) as rotation driving means, and is supported by the sewing machine frame 2 so that it can be rotated from the outside. In the present embodiment, the motor is a conventionally known servo motor, and the output shaft of the motor and the upper shaft 3 are connected in series. As shown in FIG. 1, the sewing machine 1 has a sewing needle 5 at the tip of a needle bar 4 that moves up and down by the rotation of the upper shaft 3. Similar to a conventionally known sewing machine, power is transmitted to the needle bar 4 by a needle bar drive mechanism that mechanically converts the rotation of the upper shaft 3 into vertical movement. That is, in the present embodiment, the drive unit 100 that moves the sewing needle 5 up and down includes a motor and the upper shaft 3.

  Further, when the upper shaft 3 is rotated by driving the motor, the lower shaft is rotated in time with this. A sewing hook as a timing member is fixed to the lower shaft. This sewing hook forms a seam in cooperation with the sewing needle 5 at the time of sewing. The sewing machine hook is the same as that conventionally known and will not be described in detail here. Further, the timing member may be a known looper instead of the sewing machine hook.

  The sewing machine 1 includes an adjustment mechanism 101 that manually adjusts the phase of the upper shaft 3, and a fixing mechanism 102 that serves as a fixing unit that fixes the drive unit 100 whose phase of the upper shaft 3 has been adjusted by the adjustment mechanism. A driving unit fixing device 103 is provided. Hereinafter, the drive unit fixing device 103 which is a characteristic configuration of the present invention will be described in detail.

  As shown in FIG. 2, the adjustment mechanism 101 has a driven gear 6 provided on the upper shaft 3. The adjustment mechanism 101 has an operation shaft 7 that is disposed above the driven gear 6 and extends substantially vertically up and down substantially perpendicular to the upper shaft 3. The operation shaft 7 is provided with a drive gear 8 that meshes with the driven gear 6 at the lower end portion, and an operation portion 9 that protrudes from the upper surface of the sewing machine arm 2a to the outside at the upper end portion. Although the operation part 9 of this embodiment is formed in a knob shape, the operation part 9 may be a pulley shape. As shown in FIG. 1, a portion corresponding to the operation unit 9 on the upper surface of the sewing machine arm 2a forms a detachable cover member 2b, and the drive unit fixing device 103 is exposed by removing the cover member 2b. It has become. The operation shaft 7 is configured to be rotatable and to advance and retract in the axial direction. That is, as shown in FIG. 4, the phase of the upper shaft 3 can be adjusted by rotating the operation unit 9 in a state where the driven gear 6 and the drive gear 8 are engaged with each other.

  In the present embodiment, the adjustment mechanism 101 includes a support member 10 that supports the operation shaft 7 so that the operation shaft 7 is rotatable and can be moved back and forth in the vertical direction. As shown in FIG. 2, the support member 10 has an inverted L-shape including a front-rear extending portion 10 a extending in the front-rear direction and a vertical extending portion 10 b extending downward from the rear end, and is fixed to the sewing machine body. . Specifically, as shown in FIG. 3, the support member 10 is formed with an insertion hole 11 through which the operation shaft 7 is inserted and extending substantially vertically, in the front-rear extension portion 10 a, and a screw hole 12 extending substantially forward and backward is provided vertically. It is formed in the extending part 10b. When the fixing screw 13 is screwed into the screw hole 12 and the fixing screw 13 is tightened as shown in FIG. 5, the bottom of the fixing screw 13 comes into contact with the operation shaft 7 and the operation shaft 7 is fixed in the rotational direction and the axial direction. Is done. Then, when the fixing screw 13 is loosened as shown in FIG. 3, the bottom of the fixing screw 13 is separated from the operating shaft 7 and the fixing of the operating shaft 7 is released. That is, in the present embodiment, the fixing mechanism 102 has the fixing screw 13, and the fixing screw 13 can be moved forward and backward to a contact position where the fixing screw 13 contacts the operation shaft 7 and a retracted position separated from the operation shaft 7. Make contact members.

  Further, the adjustment mechanism 101 includes a coil spring 14 wound between the operation unit 9 and the support member 10 in the operation shaft 7. The coil spring 14 as an urging unit is sandwiched between the operation unit 9 and the support member 10 and constantly urges the operation shaft 7 together with the operation unit 9 in the axial direction so that the drive gear 8 and the driven gear 6 are separated from each other. To do. That is, in the present embodiment, the drive gear 8 is engaged with the driven gear 6 against the urging force of the coil spring 14 by pressing the operation member 15 including the operation shaft 7 and the coil spring 14. The rotational force of the operation unit 9 that has been rotated is transmitted to the upper shaft 3.

  In the sewing machine 1 configured as described above, the phase of the upper shaft 3 is manually adjusted using the adjustment mechanism 101 without turning on the power, and in this state, the drive unit 100 including the upper shaft 3 by the fixing mechanism 102. Can be fixed. Thereby, when aligning the sewing needle 5 and the sewing machine hook, the operator adjusts the upper shaft 3 to a desired phase and mechanically fixes the drive unit 100 by the fixing mechanism 102, and then the sewing machine hook. Can be adjusted.

  In this embodiment, when aligning the sewing needle 5 and the sewing machine hook, the operator first removes the cover member 2b on the upper surface of the sewing machine arm 2a, and removes the part other than the operation unit 9 of the drive unit fixing device 103. Expose. Thereafter, the operator grips the operation portion 9 and moves the operation shaft 7 downward against the urging force of the coil spring 14 to mesh the drive gear 8 and the driven gear 6 (see FIG. 4). . When the operation unit 9 is rotated in a state where the gears 6 and 8 are engaged in this manner, the upper shaft 3 rotates, so that the operator can manually adjust the phase of the upper shaft 3. Since the operating shaft 7 is biased upward by the coil spring 14, the drive gear 8 and the driven gear 6 are separated from each other unless a downward force is applied to the operating shaft 7, and normal sewing is performed. At times, the rotation of the upper shaft 3 is not hindered.

  The operator can fix the operation shaft 7 at a desired position by tightening the fixing screw 13 in a state where the drive gear 8 and the driven gear 6 are engaged with each other, and the operator can loosen the fixing screw 13 to operate the operation shaft. 7 can be released. Thus, the operator can easily and accurately fix and release the operation shaft 7.

As described above, according to the sewing machine 1 of the present embodiment, it is not necessary to temporarily fix the drive unit 100 by using one hand or tape, so that the operator is devoted to adjusting the position of the sewing machine hook. be able to. In addition, since the driving unit 100 is accurately fixed by the fixing mechanism 102 and the operator touches the needle bar 4 or the like during the operation, the phase of the upper shaft 3 does not change. A work posture or the like that avoids interference is not forced, and workability can be improved. Since the burden on the operator is reduced, the accuracy of alignment between the sewing needle 5 and the sewing machine hook is improved.
Furthermore, since the upper shaft 3 is fixed mechanically without using a motor, alignment work can be performed without turning on the power, and power consumption can be reduced. Further, for example, the alignment operation can be performed even when the power supply is disconnected from the conveyance operation, which is extremely advantageous in practical use.

  Further, according to the sewing machine 1 of the present embodiment, the operation shaft 7 is fixed together with the operation shaft 7 by fixing the operation shaft 7 in a state where the driven gear 6 and the drive gear 8 are engaged and the phase of the upper shaft 3 is adjusted. The drive part 100 including it is fixed. Thus, by fixing the operating shaft 7 that forms a part of the adjusting mechanism 101, the number of parts of the fixing mechanism 102 can be reduced.

  In the above-described embodiment, the adjustment mechanism 101 and the fixing mechanism 102 are arranged on the upper part of the sewing machine frame 2, but may be arranged on the side part of the sewing machine frame 2, for example. When the operation shaft 7 is disposed on the side of the sewing machine frame 2, a configuration in which the operation shaft 7 extends in the horizontal direction is preferable. Further, the operation shaft 7 is not fixed, and the upper shaft 3 and the drive unit 100 such as a motor may be fixed.

  In the above-described embodiment, the shaft portion of the operation shaft 7 of the adjustment mechanism 101 is fixed. However, the operation portion 9 of the operation shaft 7 may be fixed. Also in this case, since the operation shaft 7 is fixed, the number of parts of the fixing mechanism 102 can be reduced. Moreover, although what fixed the operating shaft 7 with the fixing screw 13 was shown, you may make it fix the operating shaft 7 with the hole of the operating shaft 7, the pin which can be attached / detached, etc., for example.

  In the above embodiment, the coil spring 14 biases the operation shaft 7. However, the operation shaft 7 may be biased by a leaf spring, rubber, or the like. As described above, the operation unit 9 may be a knob or a pulley, and the timing member may be a sewing machine hook, a looper or a thread trimming cam. Of course, the detailed structure and the like can be appropriately changed.

1 is a schematic explanatory diagram illustrating an overall configuration of a sewing machine according to an embodiment of the present invention. It is an internal explanatory drawing of the sewing machine which shows the arrangement | positioning state of a drive part fixing device. It is sectional drawing of a drive part fixing device. It is an internal explanatory drawing of the sewing machine which shows the state by which the upper shaft was fixed by the drive part fixing device. It is sectional drawing of the drive part fixing device of the state which fixed the upper axis | shaft.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sewing machine 2 Sewing machine frame 3 Upper shaft 5 Sewing needle 6 Drive gear 7 Operation shaft 8 Drive gear 9 Operation part 10 Support member 13 Fixing screw 14 Coil spring 15 Operation member 100 Drive part 101 Adjustment mechanism 102 Fixation mechanism 103 Drive part fixing device

Claims (2)

An upper shaft that is rotatably supported by the sewing machine frame and can be rotated from the outside, a sewing needle that is connected to the upper shaft and moves up and down, and operates in synchronization with the vertical movement of the sewing needle during sewing A sewing machine having a timing member arranged,
A sewing machine comprising fixing means for fixing the upper shaft at a rotational position where the upper shaft is rotated so that the upper shaft can be moved forward and backward when the upper shaft is rotated from the outside. The upper shaft is provided with a driven gear,
An operation shaft having an operation portion for performing the rotation operation at one end and a drive gear provided at the other end to be engaged with and disengaged from the driven gear and supported so as to advance and retreat in the axial direction; and the operation shaft An urging unit that constantly urges the drive gear and the driven gear in the axial direction so as to be separated from each other, and an operation member that rotates the upper shaft.
By pressing the operation member, the drive gear and the driven gear are engaged against the urging force of the urging portion, and the rotational force of the operation portion rotated is transmitted to the upper shaft. The upper shaft can be rotated,
The fixing means includes a contact member that can advance and retreat to a contact position that contacts the operation shaft and a retracted position that is separated from the operation shaft, and the contact mechanism is engaged with the drive gear and the driven gear. The sewing machine according to claim 1, wherein rotation of the operation shaft is prevented by setting the contact position.

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