JP4822181B2 - Motor driven sewing machine - Google Patents

Description

  The present invention relates to a motor-driven sewing machine configured to drive and rotate a main shaft of a sewing machine with an electric motor. Specifically, the main shaft that protrudes outward from the side of the sewing machine frame and the output shaft that is positioned parallel to the main shaft of the drive motor disposed at the rear of the sewing machine frame are linked via a timing pulley and a timing belt. The present invention relates to a motor-driven sewing machine that is connected.

  As this type of motor-driven sewing machine, conventionally, a motor mount that can be attached to and detached from a side outer surface of the sewing machine frame via a screw member is extended to the rear side of the sewing machine frame, and on the inner surface side of the extended mounting part. The drive motor is fixedly supported, and its output shaft is projected to the outer surface side of the motor mount through a hole formed in the motor mount, and the transmission-side timing pulley is fixed to the projecting output shaft portion via a screw member. On the other hand, the main shaft is protruded to the outer surface side of the motor mounting base through a hole formed in the motor mounting base, and a passive side timing pulley is fixed to the protruding main shaft portion via a screw member. A belt formed by winding a timing belt is known (for example, see Patent Document 1).

  Republic of Taiwan (Taiwan) Invention Publication No. 200506129

  In such a motor-driven sewing machine, as is clear from the illustration in the above-mentioned Patent Document 1, the drive motor does not protrude greatly to the outside of the side of the sewing machine frame, and the longitudinal length of the sewing machine is as long as possible. In order to shorten the structure, the drive motor is disposed immediately after the sewing machine frame and in close proximity to the rear wall of the sewing machine frame so that the structure of the whole sewing machine is simplified and compact.

  By the way, in the sewing machine, in order to regularly check, adjust, and repair the internal mechanism of the sewing machine frame, a detachable or swingable cover is provided on the rear wall and side wall of the sewing machine frame. In general, when performing maintenance by attaching / detaching or opening / closing this cover on the user side, it is desirable to secure a wide working space at the rear or side of the sewing machine frame. Therefore, it is necessary to move the drive motor, which is disposed in close proximity to the machine, and hinders maintenance work, from the position immediately after the sewing machine frame to another place. As the retreating means, either a means for removing the drive motor from the motor mounting base alone, or a means for disassembling and removing the components of the transmission assembly such as the driving motor, motor mounting base, both timing pulleys, and timing belts. Must be adopted.

  However, in the case of the latter means, the components of the transmission assembly are removed one by one for each maintenance (disassembly) and reattached one after the maintenance (assembly). Not only is the operation required, but after assembly, the distance between the motor output shaft and the main shaft, which has been precisely adjusted in advance on the manufacturer's side in order to guarantee the quality at the time of shipment of the sewing machine, varies slightly. As a result, the load tension to the timing belt is changed, and the predetermined transmission performance cannot be reproduced stably. In particular, when the load tension on the belt becomes excessive, there is a problem that the frictional heat acting on the belt increases abnormally and adversely affects the belt life. Also, when the drive motor is detached from the motor mounting base like the former means, the number of operations is reduced compared to the latter means, but the mounting screws must be loosened or tightened while supporting the heavy drive motor. For this, even in the case of the former means, the transmission side timing pulley fixed to the motor output shaft is released from the output shaft by loosening the screw member, and then the drive motor is removed. In addition, after the maintenance is completed, the drive motor is attached to a predetermined position of the motor mounting base, and then the screw member is fastened to the output shaft again to fix and attach the timing pulley. It is inevitable that the distance between the shafts fluctuates with the removal of the shaft, and as a result, predetermined transmission performance is unavoidable. The there has been a problem that it is difficult to eliminate the adverse effects on the stability with good reproducibility and belt life.

  The present invention has been made in view of the above-described circumstances, and the drive motor is arranged in the immediate vicinity of the sewing machine frame at the rear wall portion of the sewing machine frame so that the overall structure is simplified and made compact. The purpose of the present invention is to provide a motor-driven sewing machine that can easily and efficiently disengage the drive motor with less work effort and operation during maintenance, and that can always reproduce the transmission performance in a stable state. .

  In order to achieve the above object, a motor-driven sewing machine according to the present invention has a main shaft that protrudes outward from the side of the sewing machine frame, and an output shaft that is positioned parallel to the main shaft at the rear of the sewing machine frame. The drive motor arranged, a motor mounting base that extends rearward from the side of the sewing machine frame on the side from which the main shaft projects, and that fixes and supports the drive motor, and the output shaft and the main shaft of the drive motor are connected to the sewing machine. A motor-driven sewing machine comprising a timing pulley and a timing belt interlockingly connected at a position outside the side of the frame, wherein the motor mounting base is rotated around a vertical axis so that the drive motor is connected to the sewing machine frame. It is configured to be switchable between a first state that is drawn out and displaced outward on the side and a second state that is disposed and fixed at a predetermined position on the rear part of the sewing machine frame. It is set to.

  According to the present invention having the characteristic configuration as described above, when the maintenance is necessary, only the timing belt is removed and the motor mounting base is rotated around the vertical axis so that the drive motor is located on the side of the sewing machine frame. By simply switching to the first state, which is pulled out and displaced outward, the drive motor can be moved away from the position immediately after the sewing machine frame to secure a wide working space at the rear part of the sewing machine frame for easy and easy maintenance. It was possible, and after the maintenance was completed, the motor mounting base was rotated around the vertical axis to switch to the second state where the drive motor was placed and fixed at a predetermined position on the rear part of the sewing machine frame and removed. It is possible to return to the normal sewing use state only by hanging the timing belt.

  Therefore, the components of the transmission assembly are disassembled one by one at the time of maintenance, while the drive motor is placed in close proximity to the rear wall of the sewing machine frame immediately after the sewing machine frame to simplify and reduce the overall structure of the sewing machine. After the maintenance, the operation pulley is assembled one by one. Alternatively, the timing pulley is released from the motor output shaft after being removed from the motor at the time of maintenance, removed from the motor mounting base while supporting the heavy drive motor, and again after maintenance. The drive motor can be easily and efficiently moved away and returned with less labor and man-hours, without requiring troublesome and labor-intensive operations such as attaching them sequentially. In addition, since it is only necessary to rotate the motor mount around the vertical axis at a fixed position, the distance between the output shaft of the drive motor and the main shaft does not fluctuate at the time of the above-mentioned retraction / return, A certain distance between the shafts, which is precisely adjusted on the manufacturer's side when the machine is shipped, can be reliably maintained, and appropriate and good transmission performance can be stably reproduced even after maintenance. In particular, it is possible to prevent inconveniences such as a reduction in transmission performance and a reduction in belt life due to excessive or insufficient load tension applied to the timing belt.

  In the motor-driven sewing machine according to the present invention, as described in claim 2, the motor mount is attached to a rear end portion of a front fixed mount that is releasably mounted on a side outer surface of the frame. When the motor mount is pivotally connected so as to be switchable between the first state and the second state, that is, when the motor mounting base is configured as a series of front and rear portions extending from the side outer surface of the sewing machine frame to the rear of the sewing machine frame. Without retrofitting such as fixing the bracket for connecting the pivot of the motor mount to the sewing machine frame, the drive assembly such as the drive motor, motor mount, both timing pulleys and timing belt can be retrofitted to the existing sewing machine. Simplification, compactness, and easy maintenance of the entire structure as described above can be easily realized.

  In particular, according to the present invention, the drive motor is disposed at a predetermined position, and a detachable rear cover is provided on the rear surface portion of the sewing machine frame. The present invention can be very effectively applied to a motor-driven sewing machine that performs maintenance on the internal mechanism.

  Further, in the case where the motor mounting base is configured to be pivotally connected to the rear end portion of the front fixed mounting base that is releasably attached to the outer side surface of the frame (claim 2), 4, in the second state in which the drive motor is disposed and fixed at a predetermined position on the rear part of the sewing machine frame, it can be spanned and abutted across the motor mounting base and the front fixed mounting base. It is preferable to provide a mounting base fixing reinforcing member capable of fixing and holding both the mounting bases in a straight line by fixing them to the two mounting bases in the spanning contact state. In this case, the motor mounting base is positioned at a predetermined position in a predetermined position by sufficiently resisting a large rotational moment around the vertical axis that will act on the motor mounting base due to high tension applied to the timing belt during operation of the sewing machine. It can be securely fixed and held in the posture. Therefore, the output moment of the drive motor is tilted and displaced with respect to the main shaft due to the rotational moment, and the inter-shaft distance fluctuates. As a result, the rotational force transmission performance from the drive motor to the main shaft decreases, It is possible to reliably prevent the occurrence of a malfunction such as accidental disconnection.

  Further, in the case where the motor mounting base is configured to be pivotally connected to the rear end portion of the front fixed mounting base that is releasably attached to the outer side surface of the frame (claim 2), 5, it is preferable that a bearing for rotatably supporting the spindle-side timing pulley is held on the front mounting base. In this case, by adjusting the position of the bearing with respect to the motor mounting base at the time of initial assembly, the distance between the output shaft of the drive motor and the main shaft can be easily and precisely optimized to improve the transmission performance at the time of shipment, and consequently the sewing machine. The quality can be improved and the state can be maintained for a long time.

  Furthermore, in the motor-driven sewing machine according to the present invention, as described in claim 5, a belt cover that covers both the timing pulleys and the timing belt is provided on an outer surface of the motor mounting base or a side portion of the motor mounting base and the sewing machine frame. It is preferable to detachably attach to the outer surface. In this case, although the belt cover needs to be attached / detached during maintenance, safety can be ensured for workers and the like by covering the transmission assembly exposed on the side of the sewing machine frame during normal sewing use.

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic perspective view of an entire motor-driven sewing machine according to the present invention. In FIG. 1, reference numeral 1 denotes a sewing machine frame including a sewing machine bed portion 1A and a sewing machine arm portion 1B. A cylinder bed 2 extends from the lower front of the sewing machine in a direction opposite to the sewing progressing direction a (front of the sewing machine), and the rear part of the sewing machine bed 1A in the sewing machine frame 1 is located in the sewing machine frame 1. A detachable rear cover 3 is provided for opening and closing an opening when performing various maintenance such as inspection, adjustment, and repair with respect to an internal mechanism (not shown). In FIG. 1, 22 is a thread tensioner, and 23 is a hand pulley.

  As clearly shown in FIGS. 2 and 3, a main shaft 4 protrudes from the sewing machine bed 1A of the sewing machine frame 1 toward the outside of the side of the sewing machine bed 1A. On the other hand, an electric drive motor 5 is disposed in the position immediately adjacent to the rear cover 3 immediately after the sewing machine bed 1A in the sewing machine frame 1 with its output shaft 5a positioned parallel to the main shaft 4. .

  A plurality of first screw members 12 (shown as four in the drawing but may be three or five or more) are provided on the outer surface of the side of the sewing machine bed 1A in the sewing machine frame 1 through the front part. The fixed motor mounting base 11A is releasably attached, and the rear end of the front fixed motor mounting base 11A is fitted with a male and a female formed so as to fit each other from the front and the rear. A motor mounting base 11B that is rotatable around the vertical axis is pivotally connected via a shaft 24 penetrating the parts 11a and 11b in the vertical direction. The rear movable motor mounting base 11B and the front part are connected to each other. A series of long rectangular plate-shaped motor mounts 11 are formed on the front and rear sides of the fixed motor mount 11A.

  Of the motor mount 11, the drive motor 5 is provided with a plurality of screws 13 on the inner surface side of the rear movable motor mount 11B. It may be fixedly supported via With such a configuration, the drive motor 5 is moved to the sewing bed 1A side by rotating the rear movable motor mounting base 11B around the axis of the vertical shaft 24 with respect to the front fixed motor mounting base 11A. It is possible to switch between a first state that is drawn out and displaced outward and a second state that is disposed at a predetermined position immediately after the sewing machine bed 1A.

  An output shaft 5a of the drive motor 5 passes through an insertion hole 14 formed in the rear movable motor mount 11B of the motor mount 11 and protrudes to the outer surface side of the motor mount 11 (11B). While the transmission side timing pulley 9 is fixed to the portion 5a via a screw 7, the portion corresponding to the main shaft 4 of the front fixed motor mounting base 11A of the motor mounting base 11 is connected to the main shaft 4 outside the side. A bearing press-fitting hole 18 is formed to rotatably support the adapter 15 that can be fitted and removed from the side through a bearing 16 and a bearing retainer 17, and the adapter 15 can be rotated through the bearing 16 press-fitted and fixed to the press-fitting hole 18. A passive-side timing pulley 8 that is brought into contact with the outer surface of the supported adapter 15 and fitted to the main shaft 4 is fixed to the main shaft 4 via screws 19.

  Between the transmission-side timing pulley 9 and the passive-side timing pulley 8, a timing belt 10 for linking the main shaft 4 and the output shaft 5a of the drive motor 5 is wound and stretched. The load tension of the timing belt 10 is determined by adjusting the fixing position of the bearing 16 with respect to the front fixed motor mounting base 11A on the manufacturer side at the time of shipment of the sewing machine to adjust the distance L between the main shaft 4 and the output shaft 5a of the drive motor 5. The optimum value is set in advance by precisely adjusting (see FIG. 3).

  When the front and rear motor mounting bases 11A and 11B are set to the second state on the outside of the side of the motor mounting base 11, the motor mounting base 11 is in a spanned state across the outer surfaces of the front and rear motor mounting bases 11A and 11B. A mounting base fixing / reinforcing reinforcing member 25 having a contactable length is provided, and the second screw member 26 is in a state where the reinforcing member 25 is stretched between the outer surfaces of the front and rear motor mounting bases 11A and 11B. The front and rear motor mounting bases 11A and 11B are fixed in a straight line by fixing them to the front and rear motor mounting bases 11A and 11B through four (shown as four in the drawing, but two or more are sufficient). It is configured to be able to hold.

  Further, on the outer surface side of the motor mount 11, a belt cover 20 that covers the timing pulleys 8, 9 and the timing belt 10 is shown by bolts 21 (two are shown in the drawing, but may be three or more. ) Is removably attached via

  In the motor-driven sewing machine configured as described above, during normal sewing use, as shown in FIG. 3, the front and rear mounting bases 11A and 11B of the motor mounting base 11 are stretched across their outer surfaces. The output shaft 5a and the main shaft 4 of the drive motor 5 are connected to each other via the timing pulleys 9 and 8 and the timing belt 10 while being in a second state in which the reinforcing member 25 is in contact and fixed and held in a straight line. When the driving motor 5 is operated in this state, the driving rotational force is transmitted to the main shaft 4 via the timing pulleys 9 and 8 and the timing belt 10 to perform a predetermined sewing operation.

  When maintenance such as inspection, adjustment or repair of the internal mechanism of the sewing machine frame 1 becomes necessary, the bolt 21 is loosened to remove the belt cover 20 from the motor mount 11, and the timing belt 10 is removed. After the second screw member 26 is loosened and the reinforcing member 25 is fixedly released from the motor mount 11, the rear movable motor mount 11B is moved around the axis of the vertical shaft 24 with respect to the front fixed motor mount 11A by the arrow X. 4, the drive motor 5, the rear movable motor mounting base 11 </ b> B, and the transmission-side timing pulley 9 are positioned so that the motor output shaft 5 a is orthogonal or almost orthogonal to the main shaft 4 as shown in FIG. 4. By switching to the first state that is pulled out and displaced to the outside of the side of the sewing machine bed portion 1B, the sewing bed portion 1A of the sewing machine frame 1 is changed. Securing a wide working space drive motor 5 is dismissed in part, it can be easily performed and easily the predetermined maintenance by opening the opening portion by leaving the rear cover 3 in this state.

  After the maintenance is completed, the rear cover 3 is fixed to close the opening, and then the rear movable motor mounting base 11B is moved around the axis of the vertical shaft 24 with respect to the front fixed motor mounting base 11A in the arrow Y direction. As shown in FIG. 3, the sewing machine bed 1 </ b> B is arranged so that the motor output shaft 5 a is parallel to the main shaft 4 as shown in FIG. 3. The reinforcing member 25 is placed across the outer surfaces of the front and rear motor mounting bases 11A and 11B, and the front and rear motor mounting bases are interposed via the second screw member 26. 11A and 11B are fixed to the second state in which both the front and rear motor mounting bases 11A and 11B are fixedly held in a straight line, and then the timing belt 10 is moved to both timing belts. On wound between 8.9, by securing the belt cover 20 to the motor mount 11 via a bolt 21, it can be restored to the normal sewing use.

  As described above, the drive motor 5 is arranged immediately adjacent to the rear wall of the sewing machine bed 1A immediately after the sewing machine frame 1 to simplify and reduce the overall structure of the sewing machine. Disassembling the elements one by one and assembling them one by one after maintenance, or removing the transmission-side timing pulley 9 from the motor output shaft 5a by releasing it from the motor output shaft 5a during maintenance. It is possible to attach the rear movable motor while keeping the weight of the drive motor 5 in the rear movable motor mounting base 11B without requiring a cumbersome operation of removing the motor mounting base 11 while supporting it by hand and attaching them again after maintenance. With less work effort and maneuvering such as turning around the axis of the table 11B vertical shaft 24 Easy and can be or is restored or efficiently dismissed drive motor 5.

  Further, since the rear movable motor mount 11B only needs to be rotated around the axis of the vertical shaft 24 at a fixed position, an inter-axis distance L between the output shaft 5a of the drive motor 5 and the main shaft 4 at the time of retreating / returning. It is possible to maintain a certain distance between the shafts that is precisely adjusted at the manufacturer's side when the sewing machine is shipped, and to ensure proper and good transmission performance even after maintenance. It can be reproduced stably. In particular, the load tension applied to the timing belt 10 can be maintained at the initial adjustment value without excess or deficiency to prevent a reduction in transmission performance and an adverse effect on the belt life.

  In the above-described embodiment, the reinforcing members 25 for fixing and holding the front and rear motor mounting bases 11A and 11B in a straight line form are arranged in a straight line between the lower outer surfaces of the front and rear motor mounting bases 11A and 11B. As shown by the phantom line in FIG. 2, the upper and lower portions of the outer surfaces of the front and rear motor mounting bases 11A and 11B are substantially U-shaped as shown by phantom lines in FIG. You may use the thing of the form which can be provided over a span. In this case, both the front and rear sides are sufficiently countered by the large rotational moment around the vertical axis acting on the rear movable motor mount 11B due to the high tension applied to the timing belt 10 in the second state (sewing operation state). The motor mounts 11A and 11B can be fixed and held in a straight line with even greater certainty.

  The reinforcing member 25 may be a bar member having a square cross section or a flat bar bent into an L shape.

  Furthermore, in the said embodiment, the motor mounting base 11 is divided | segmented into two front and back, Among them, the rear mounting base 11B was pivotally connected with respect to the front mounting base 11A so that rotation was possible around a vertical axis. As described above, the front mounting base 11A is not used, and the rear mounting base 11B may be pivotally supported by a bracket fixed to the sewing machine bed 1B so as to be pivotable about the vertical axis.

1 is a schematic perspective view of an entire motor-driven sewing machine according to the present invention. It is an expansion disassembled perspective view of the principal part. It is an expanded horizontal sectional view of the principal part which shows a normal sewing use state. It is an expanded cross-sectional view of the principal part which shows the drive motor withdrawal state at the time of a maintenance.

Explanation of symbols

1 sewing machine frame 3 rear cover 4 main shaft 5 drive motor 5a output shafts 8 and 9 timing pulley 10 timing belt 11 motor mounting base 11A front fixed motor mounting base 11B rear movable motor mounting base 16 bearing 20 belt cover 25 reinforcement for fixing the base Element

Claims (6)

A main shaft that protrudes outward from the sewing machine frame, a drive motor that is disposed at the rear of the sewing machine so that its output shaft is parallel to the main shaft, and a side of the sewing machine frame on which the main shaft protrudes A motor mounting base that extends rearward from the section and fixes and supports the drive motor, and a timing pulley and a timing belt that interlock and connect the output shaft of the drive motor and the main shaft at a laterally outward position of the sewing machine frame. A motor driven sewing machine comprising:
The first state in which the motor mounting base is rotated around the vertical axis and the drive motor is pulled out and displaced outward from the side of the sewing machine frame, and the second state in which the motor mounting base is disposed and fixed at a predetermined position on the rear part of the sewing machine frame. A motor-driven sewing machine characterized in that it can be switched between.   The motor mounting base is pivotally connected to a rear end portion of a front fixed mounting base that is releasably attached to an outer side surface of the frame so as to be switchable between the first state and the second state. Item 2. The motor-driven sewing machine according to Item 1.   The motor-driven sewing machine according to claim 1 or 2, wherein a detachable rear cover is provided on a rear surface portion of the sewing machine frame where the driving motor is disposed at a predetermined position.   In the second state, the motor mounting base and the front fixed mounting base can be brought into contact with each other, and are fixed to both mounting bases in the state of contact between the two, so that both the mounting bases are in a straight line shape. The motor-driven sewing machine according to claim 2, wherein a mounting base fixing reinforcing member that can be fixed and held is provided.   The motor-driven sewing machine according to any one of claims 2 to 4, wherein a bearing that rotatably supports the timing pulley on the main shaft side is held on the front mounting base.   The motor according to any one of claims 1 to 5, wherein a belt cover that covers both the timing pulley and the timing belt is detachably attached to an outer surface of the motor mounting base or a side outer surface of the motor mounting base and the sewing machine frame. Drive type sewing machine.

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