JPS6143416Y2 - - Google Patents

Description

[Detailed description of the invention] A. Industrial field of application This invention relates to a mobile sewing machine that is mainly used for sewing the edges of jackets, and in particular, it is possible to move the sewing machine without moving jackets, etc. Regarding the mobile sewing machine for processing.

B. Prior Art and its Problems The present inventor developed a mobile sewing machine for edge stitching of jackets, in which traveling wheels are attached to the bottom of the sewing machine body (Japanese Utility Model Publication No. 78085/1985).

By the way, a sewing machine with wheels attached to the bottom of the sewing machine has been developed as a tatami edge sewing machine. (Japanese Utility Model Publication No. 44-17966) In all of these sewing machines, the object to be sewn is fixed and the sewing machine is moved to sew. In this type of sewing machine, the amount of movement of the sewing machine must be determined in accordance with the sewing speed. In conventional sewing machines, the workpiece is clamped between a presser foot near the needle and a serrated transfer tool located under the presser foot on the top surface. was moved.

Relatively thin fabrics can be transported sufficiently using a presser foot and a transfer tool, but thick fabrics such as jutan
It is not always possible to transfer at a constant pitch. In particular, mobile sewing machines still need to be moved, which requires a fairly strong transport ability.

By the way, a mechanism for feeding cloth using rollers has been developed for sewing machines with high cloth feeding speeds, such as industrial sewing machines (Japanese Patent Application Laid-Open No. 55-5663).

Also, by arranging many sewing machines in series in the cloth feeding direction,
A mechanism has also been developed in which the fabric to be embroidered by multiple sewing machines is forcibly fed using a roll (Special Publication No. 51-2030).

However, these conventional sewing machines are designed to feed fabric quickly or to match the fabric feeding speed of multiple sewing machines, and are not used to drive the sewing machines, so they are not used to sew thick and large fabrics. However, the sewing machine itself cannot be moved to match the sewing speed.

In developing the present invention, the present inventor also developed a system for driving running wheels attached to the sewing machine body as a mechanism for smoothly moving the sewing machine in accordance with the sewing speed. This mechanism allows the sewing machine to move smoothly, but it is difficult to move the sewing machine body in synchronization with the sewing machine's sewing speed, and the disadvantage is that the sewing machine's cloth feed does not match the movement of the sewing machine itself. It was hot. especially,
Depending on the condition of the floor surface on which the sewing machine is placed, the sewing machine cannot move at the same speed as the sewing speed even if the moving wheels are set accurately to the sewing speed.

In order to eliminate this drawback, the inventor of the present invention has developed a sewing machine that transfers the sewing machine by sandwiching it between rolls. In this sewing machine, a roll is intermittently rotated at a constant angle in synchronization with the sewing operation of a needle to transport jackets and the like. This roll is driven via a clutch with power transmitted only to one side, which transports the jacket. However, in this structure, the drive shaft of the roll is driven by a swinging arm, so when the drive shaft is rotated in the direction of transferring the jutan, one clutch is connected and the roll 8D is moved as shown in FIG. However, when the drive shaft 28 is rotated in the opposite direction by the swinging arm 17, a force is applied that moves the jersey back to its original position, and the eighth
There was a drawback that the roll 8 rotated in the direction indicated by the arrow B in the figure, causing the jacket and the like to retreat somewhat, resulting in uneven stitches.

That is, when the arm 17 moves in the direction _P1 in FIG. 7 and pulls the jacket and the like to move the sewing machine, a reaction force acts to restore the sewing machine to its original position. Therefore, as shown in Figure 8,
When the arm 17 moves in the direction of _P2 in Fig. 8,
Unless the rotation of roll 8D is forcibly stopped,
Roll 8D rotates in the direction of arrow B together with arm 17. However, if the roll 8D is not driven by a swinging arm but is driven by a stepping motor or the like that rotates the shaft of the roll 8D by a predetermined angle in synchronization with other transport means, the roll 8D is not driven by a swinging arm. The 8D drive shaft can be stopped. Therefore, in this case, the jutan etc. can be transferred accurately at a constant pitch. However, this method requires an expensive stepping motor and a control circuit to control its operation, and has the disadvantage that the overall structure is extremely complex and expensive.

Since the swinging arm can be easily obtained from another power source of the sewing machine, if the roll can be rotated at a constant pitch using this swinging arm, constant transfer of the jacket or the like can be realized with the simplest mechanism.

The sewing machine shown in the above-mentioned Japanese Patent Publication No. 51-2030 rotates the feed roll in one direction and is driven by a clutch, but even with this system, the swinging arm transports the material to be sewn. When the workpiece is moved in the opposite direction, the arm of the feed roll that transports the workpiece rotates in the opposite direction along with the shaft, making it impossible to eliminate the backlash caused by the reaction that occurs after the workpiece is transported, making it difficult to accurately maintain the fixed pitch. It has the disadvantage that it cannot be transported.

By the way, in the transfer means for pinching and transporting the workpiece, the serrated cloth feed protrudes from the needle plate, which is the sewing surface, and is pressed against the lower surface of the workpiece, but in this state, The object to be sewn is prevented from retreating. However, since this cloth feeder reciprocates to transport the sewing material in a fixed direction, it is necessary to move in the opposite direction to the cloth transporting direction below the throat plate. There is a drawback that the material to be sewn tends to move backward when the serrated material is not pressed against the back surface of the material to be sewn because the material feed is located on the lower surface of the throat plate.

This invention was developed with the aim of further eliminating this drawback, and the purpose of this invention is to reverse the gripping roll that forcibly transports the workpiece without transporting the workpiece. To provide a mobile sewing machine that is easy to use, prevents irregular stitches from occurring, and can easily and reliably sew thick objects to be sewn, by transporting the sewing machine reliably at a constant pitch according to the sewing process.

C. Measures to solve conventional problems A running wheel is attached to the bottom of the sewing machine body, and the wheels move the sewing machine along the edge of the workpiece to sew the edge of the workpiece. It is a mobile sewing machine.

A mobile sewing machine consists of a moving means for pinching and transporting the workpiece, a pair of clamping rolls disposed in front of the transporting means for transporting the workpiece by sandwiching it between the upper and lower sides, and the pair of clamping rolls. an elastic body that urges the rolls in the direction of pressure contact with each other; a drive means that rotates the clamping rolls at a predetermined pitch in the direction in which the sewing material is transferred by the transfer means in synchronization with the transfer means; and movement and sewing of the mobile sewing machine. blocking means fixed to the sewing machine body and acting on the clamping roll so that the clamping roll is not rotated by the sewing machine body in the opposite direction to the direction in which the clamping roll is driven by the driving means due to the reaction caused by the machining; Consisting of

To move a sewing machine main body without moving back a workpiece to be sewn in accordance with the sewing process by a clamping roll.

D. Effects Hereinafter, the effects of the embodiment in which the blocking means for preventing the nipping roll from reversing is a clutch on one side will be explained based on FIGS. 7 to 9.

As shown in FIG. 9, this means prevents the workpiece from retreating when the workpiece is pulled in the direction of arrow T while the workpiece is being clamped between the clamping rolls 8A and 8B. On the other hand, since the clutch does not restrict the rotation of the clamping roll 8D in the direction of transporting the workpiece,
On the other hand, the clutch does not stop the rotation of the clamping roll 8D, and the workpiece is pulled out to the sewing machine.

In the actual sewing process, when the arm 17 is swung, the object to be sewn is transported at a constant pitch through the movements shown in FIGS. 7 and 8.

As shown in FIG. 7, when the arm 17 swings in the direction P ₁ and the drive shaft fixed thereto is rotated by a required angle, the clutch moves between the drive shaft and the lower roll 8.
D, and the lower roll 8D is rotated to move the sewing object a certain distance. That is, arm 17 is P ₁
Considering the relative motion between the drive shaft 28 and the lower roll 8D in the state of swinging in the direction of
8 rotates to the right with respect to the lower roll 8D, in other words, the lower roll 8D tries to rotate to the right with respect to the drive shaft 28, so the clutch prevents the lower roll 8D from rotating with respect to the drive shaft 28. will be connected to.

In this state, one clutch between the lower roll 8D and the fixed shaft is not connected, and the lower roll 8D rotates in the direction of arrow A together with the arm and the drive shaft.

When the swinging arm 17 moves in the direction shown in FIG. 8, the clutch that connects the drive shaft 28 and the lower roll 8D releases the connection. That is, in this state, the drive shaft 28 rotates to the right with respect to the lower roll 8D, in other words, the lower roll 8D is rotated to the left with respect to the drive shaft 28, so that the relationship between the drive shaft 28 and the lower roll 8D is One clutch in between is not connected.

However, when the lower roll 8D attempts to rotate in the direction shown by arrow B in this state, one clutch between the lower roll 8D and the fixed shaft connects the lower roll 8D and the fixed shaft, causing the lower roll 8D to reverse rotation. to stop.

Therefore, in this state, even if the object to be sewn is pulled in the direction of arrow T by the reaction after being transferred, the lower roll 8D will not be reversed.

That is, in the mobile sewing machine having this structure, when the arm swings, only one of the clutches between the drive shaft and the fixed shaft and the lower roll is connected.
By selectively switching the connection state depending on the swinging direction of the arm, one or both of the nipping rolls are forcibly rotated at a constant pitch, and reversal due to reaction is prevented.

7 to 9 show an embodiment in which the driving means is connected to the lower roll 8D, it goes without saying that the driving means can also be connected to the upper roll or to both the upper and lower rolls.

E. Preferred Embodiment Hereinafter, one embodiment of this invention will be described based on the drawings.

The sewing machine shown in FIG. 1 has traveling wheels 2 attached to the bottom of a sewing machine body 1.

One wheel 2 is installed at each of the four corners of the sewing machine body 1,
A total of 4 pieces are installed. In FIG. 1, the wheel 2 on the right side is supported so that the wheel shaft 4 does not rotate in a horizontal plane so that the sewing machine body 1 can move only in parallel to the direction of movement of the workpiece 3. . The left wheel 2 is attached to the bottom of the sewing machine body 1 via a rotatable vertical shaft such that the wheel shaft 4 is rotatable in a horizontal plane.

The sewing machine main body 1 includes a presser foot 6 that presses the workpiece 3 downward near the needle 5 sewing the workpiece 3, and a presser foot 6 that presses the workpiece 3 downward, and a presser foot 6 that presses the workpiece 3 at a certain pitch. It is equipped with a transfer means consisting of a remittance tool 7 that transfers the material to be sewn, and the front side of the transfer means (in this specification, the front refers to the direction in which the workpiece 3 is transferred).
The pinching roll 8 disposed in the pinching roll 8, the driving means 9 of the pinching roll 8, and the pinching roll being rotated in the opposite direction to the driving direction of the driving means to prevent the workpiece 3 from moving backward. and prevention means.

As shown in FIG. 2, the pinching roll 8 consists of a lower roll 8D and an upper roll 8U, both rolls 8D,
The workpiece 3 is sandwiched between 8U and transported at a constant pitch.

The lower roll 8D is located below the sewing table 10 and is supported such that its upper portion protrudes somewhat from the upper surface of the sewing table 10.

As shown in FIG. 3, the upper roll 8U is pressed against the lower roll 8D via a coil spring 11, which is a pressing spring.

The upper roll 8U has a rotating shaft attached to the lower end of the vertical shaft 12, and the vertical shaft 12 is inserted into the L-shaped support 13 so as to be vertically movable.A cam lever 14 is attached to the upper end of this vertical shaft 12 so as to be rotatable in a vertical plane. installed.

When the cam lever 14 is raised from the horizontal position shown in FIG. 3, the cam surface 15 presses the upper end surface of the L-shaped column 13 to pull up the vertical shaft 12.

When the cam lever 14 is in a horizontal position, the coil spring 11 interposed between the L-shaped support 13 and the vertical shaft 12 moves the upper roll 8U to the lower roll 8D.
Pressed by

The driving means rotationally drives either or both of the upper roll and the lower roll in accordance with the sewing speed.

The driving means 9 in FIG. 2 rotates the lower roll 8D. As shown in FIG. 4, the drive means 9 includes a one-side clutch 16A built into the lower roll 8D, and a lower roll 8D to which the one-side clutch 16A is attached.
An arm 17 fixed to a drive shaft 28, a connecting rod 18 whose one end is rotatably connected to the end of this arm 17, a rocker arm 19 rotatably connected to the other end of this connecting rod 18, and this rocker arm. 19 and a main connecting rod 21 that connects the crankshaft 20.

The blocking means for preventing the workpiece 3 from retreating when the pinching roll is rotated in the opposite direction to the driving direction of the driving means includes a clutch 16B on one side and a fixed shaft inserted through the central axis of the clutch 16B on the other hand. It consists of 29.

On the other hand, the clutches 16A and 16B rotate only to the left around the outer periphery of the lower roll in FIG.
8 rotates to the right, the rotational torque is not transmitted to the outer periphery of the lower roll 8D.

As shown in FIG. 4, two one-side clutches 16A and 16B are arranged in the axial direction on the lower roll 8D, and the drive shaft 28 and the fixed shaft 29 are arranged relative to the lower roll 8D. They are fitted so that they can rotate in the same direction. In FIG. 4, the drive shaft 2 is inserted into and supported by the one-way clutch 16A located on the left.
8 is connected to the arm 17, and a fixed shaft 29 located on the right side, which is inserted through and supported by the clutch 16B, is fixed to the frame.

A thin shaft 30 protrudes to the left of the drive shaft 28, and this thin shaft 30 is rotatably inserted into a cylindrical fixed shaft 29.

On the other hand, the clutches 16A and 16B may be of any type that can transmit rotational torque of the shaft only in one direction. FIG. 5 shows an example of a one-way clutch. In this one-way clutch, a pawl groove 33 is carved in an outer ring 31 in which a roller 32 can move, and when the shaft rotates to the left, the pawl groove 33 is narrowed between the outer ring 31 and the shaft, and the rotational torque of the shaft is transferred to the outer ring 31. to communicate.

The lower roll 8D in FIG. 4 incorporates two sets of one-side clutches 16A and 16B. On the lower roll 8D,
Although not shown, it is also possible to incorporate three or more one-way clutches; in this case, the shaft of one of the one-way clutches is used as a drive shaft, and the shaft of the other one-side clutch is used as a fixed shaft.

The two one-side clutches 16A and 16B forcibly rotate the lower roll 8D in one direction at a constant pitch in the following state.

In FIG. 2, when the lower end of the arm 17 is moved to the right and the drive shaft 28 is rotated to the left, one clutch 16A on the drive shaft side is engaged and rotates the lower roll 8D to the left. At this time, the one clutch 16B on the fixed shaft side is in the same state as when the fixed shaft 29 is rotated to the right with respect to the lower roll 8D, and the lower roll 8D
does not prevent rotation. After that, when the lower end of the arm 17 is moved to the left and the drive shaft 28 is rotated to the right,
The lower roll 8D is moved by the workpiece that is about to retreat
tries to rotate to the right, but always lower roll 8D
One clutch on the fixed shaft side that prevents clockwise rotation of the
6B prevents the lower roll 8D from rotating in reverse, and the lower roll 8D does not rotate clockwise together with the drive shaft 28. Thereafter, this operation is repeated, and the lower roll 8D is forcibly rotated only to the left intermittently at a constant rotation angle.

The connecting portion of the arm 17 that rotates the drive shaft 28 and the connecting rod 18 that drives this arm 17 can be moved, so that the rotation angle of the lower roll 8D can be controlled.
That is, as shown in FIG. 6, the arm 17 and connecting rod 18 are connected by an adjustment screw 22 and a nut 23. The adjustment screw 22 has a cylindrical portion 24 that is longer than the thickness of the arm 17 and the connecting rod 18 and has a smaller diameter than the slit 26 of the arm 17 and the hole of the connecting rod 18. At the tip of this cylindrical portion 24,
A male thread that is thinner than this is engraved.

As shown in FIG. 2, the Rotzker arm 19 is
so that it can rotate by any desired angle within the vertical plane.
The middle part is supported on the frame via a shaft.

The rocker arm 19 has two arms extending downward and one arm extending upward, and the connecting rod 18 is connected to the lower end of the arm extending directly below, and one end of the main connecting rod 21 rotates to the curved arm 25 extending downward. freely connected.

The other end of the main connecting rod 21 is rotatably connected to the crank pin of the crankshaft 20, and the connection point with the bending arm 25 is the rocker arm 19.
By adjusting the locking angle of the sewing machine, the amount of movement of the workpiece 3 can be changed.

A slit 26 passes through the curved arm 25 in the longitudinal direction, and the arm 17 of the lower roll is connected to the connecting rod 18 by a mechanism similar to that of the arm 17 of the lower roll.

The crankshaft 20 drives the transfer tool 7 together with the lower roll 8D. The left end of the remittance tool 7 is rotatably connected to the upper end of the rocker arm 19, and the remittance tool 7 is reciprocated left and right, and is further rotatably inserted into the crank pin of the crankshaft 20, so that the sending surface 27 is moved up and down.

The feeding surface 27 is formed in a sawtooth shape so that the sewing object 3 can be pressed and transferred without slipping.

When the crankshaft 20 is rotated, the driving means 9 causes the sending surface 27 of the remittance tool to protrude from the sewing table and move from left to right, and together with this, the lower roll 8D
rotates to the left by a required angle to transfer the workpiece 3 to the left.

F. Effect The mobile sewing machine of this invention has running wheels attached to the bottom of the sewing machine body, and the workpiece is sandwiched between the upper and lower sides and transported in front of a transport means that transports the workpiece while sewing it. A clamping roll is provided, and the clamping roll is configured to be rotated by a driving means at a constant pitch in accordance with the speed of the sewing process. The application roll is configured to be forcibly rotated only in a fixed direction, and to be reliably prevented from being reversed by the object to be sewn by the blocking means. Therefore, no matter how thick the material to be sewn, the upper and lower sides of the material to be sewn can be pinched and transported by the pinching rolls.Furthermore, the pinching rolls can be moved by a driving means according to the speed of the sewing process.
It is driven to rotate at a constant pitch. Therefore, no matter how thick the object to be sewn, it can be moved relatively reliably with respect to the sewing machine in accordance with the sewing process. That is, the sewing machine body is reliably moved at a predetermined pitch by the joint action of the traveling wheels, the transport means, and the clamping rolls.
For this reason, there is no need to push the sewing machine by hand,
It is easy to use and has the advantage of minimizing irregularities in the seams of the workpiece.

Furthermore, a noteworthy feature of this invention is that the clamping rolls that transport the workpiece are prevented from being pulled back and rotating in the opposite direction by the reaction after the workpiece has been transported with a certain pitch. The objects to be sewn can be transported accurately with a constant pitch, and the structure of the driving means can be simplified. This means that the transfer means that clamps and transfers the workpiece does not need to constantly prevent the workpiece from retreating, and uses a transport means with a simple structure in which the fabric feed moves backward at the bottom surface of the throat plate. Realizes the feature of reliably feeding the cloth even when

[Brief explanation of the drawing]

Fig. 1 is a side view of a mobile sewing machine showing an embodiment of the present invention, Fig. 2 is a sectional view showing the lower roll and driving means, Fig. 3 is a side view of the vicinity of the upper roll, Figs. 4 and 5. 6 is a sectional view of the lower roll and one clutch, FIG. 6 is a perspective view of the lower roll, and FIGS.
FIG. 9 is a schematic side view showing the rotating state of the nipping roll. 1... Sewing machine body, 2... Wheel, 3... Sewn object, 4... Shaft, 5... Needle, 6... Presser foot, 7...
Transfer tool, 8...pinching roll, 9...driving means, 1
0... Sewing table, 11... Coil spring, 12
...Vertical shaft, 13...L-shaped support, 14...Cam lever, 15...Cam surface, 16A, 16B...One side clutch, 17...Arm, 18...Conrod,
19...Rotzker arm, 20...crankshaft,
21...Main connecting rod, 22...Adjustment screw, 23
... Nut, 24 ... Cylindrical part, 25 ... Curved arm, 26 ... Slit, 27 ... Feeding surface, 28
... Drive shaft, 29 ... Fixed shaft, 30 ... Thin shaft, 3
1... Outer ring, 32... Roller, 33... Pawl groove.

Claims (1)

[Claims for Utility Model Registration] (1) A running wheel is attached to the bottom of the sewing machine body, and the wheels move the sewing machine along the edge of the workpiece to sew the edge of the workpiece. In a mobile sewing machine configured to perform processing, a pair of clamping rolls are disposed in front of a transfer means for pinching and transporting a workpiece to be sewn, and a pair of clamping rolls for transporting a workpiece to be sewn by sandwiching the workpiece at the top and bottom; an elastic body that urges the pinching rolls in the direction of pressure contact with each other; a drive means that rotationally drives the pinching rolls at a predetermined pitch in the sewing material transfer direction of the transfer means in synchronization with the transfer means; The clipping roll is fixed to the sewing machine body so that the clamping roll is not rotated by the sewing machine body in a direction opposite to the direction in which it is driven by the driving means due to a reaction caused by the movement of the mobile sewing machine and the sewing process. 1. A mobile sewing machine comprising a blocking means acting on a clamping roll, the clamping roll being configured to move a sewing machine main body without retracting the object to be sewn in accordance with the sewing process. (2) The mobile sewing machine according to claim 1, wherein the blocking means is a one-way clutch that fits between a fixed shaft fixed to the frame of the sewing machine and a clamping roll. (3) The nipping roll consists of an upper roll and a lower roll, and a driving means is connected to the lower roll. An arm fixed to the shaft of the sewing machine, a connecting rod with one end rotatably connected to this arm, and a connecting rod rotatably connected to the other end of the connecting rod, which itself is supported on the frame of the sewing machine body so as to be rotatable through the required angle. Registered as a utility model consisting of a Rotsuker arm, which is rotatable, and a main connecting rod, one end of which is rotatably connected to the arm of the Rotsuker arm, and the other end rotatably connected to a crank pin of a drive shaft that is rotated by the motor of the sewing machine body. A mobile sewing machine according to claim 1.