JP5574682B2 - Vertical feed sewing machine - Google Patents

Description

  The present invention relates to a vertical feed sewing machine.

The vertical feed sewing machine is composed of a feed dog that reciprocates in the front-rear direction of the cloth feed while appearing from below the needle plate, and a feed leg that moves in the front-rear direction while moving up and down from the top of the needle plate in synchronization with the feed dog. The two cloths are overlapped, and these cloths are sandwiched from above and sent from below, so that the two cloths are stitched together.
Furthermore, in order to keep the seam allowance (the length from the seam to the side end along the feed direction of the upper and lower fabrics) constant, the vertical feed sewing machine is parallel to the upper surface of the needle plate and perpendicular to the fabric feed direction. An upper manipulator for moving each cloth and a lower manipulator are provided.
The upper manipulator and the lower manipulator are each provided with a roller that moves the cloth in a direction perpendicular to the cloth feeding direction at the tip. During sewing, the roller is rotated by a servo motor while detecting the side edge of the cloth, and the sewing allowance is increased. Is kept constant (see, for example, Patent Documents 1 and 2).

JP 58-192576 A JP 59-14881 A

By the way, as shown in FIG. 15, the upper cloth CU to be sewn is stitched by a seam perpendicular to the cloth feed direction F, and is folded by the seam to form the step portion D. When sewing, the following problems have occurred.
As shown in FIG. 16, the conventional vertical feed sewing machine described above includes upper and lower sensors 202 and 203 that detect the side end positions of the upper cloth CU and the lower cloth CD on the upstream side in the cloth feed direction of the needle plate 201. An upper roller 204 that contacts the upper surface of the upper cloth CU and a lower roller 205 that contacts the lower surface of the lower cloth CD are provided further upstream. Further, a separation plate 206 that separates the upper and lower fabrics CU and CD is provided between the upper and lower rollers 204 and 205, and a guide plate 207 that guides the upper fabric CU to the separation plate 206 side on the upstream side of the upper roller 204. Is provided.
In these arrangements, when the upper cloth having the stepped portion D is conveyed, the stepped portion D formed with the cloth ends in the double-opened state is lifted up by the guide plate 207 and faces the upstream side in the cloth feeding direction. There was a problem that it was knocked down (one-sided) and sewn as it was.
Further, assuming that the guide plate 207 has passed safely, the stepped portion D is raised by the upper roller 204 or the upper sensor 202 on the downstream side and directed upstream in the feed direction, and is still sewn while being tilted down. It had a problem that
Further, even when the same step portion is formed on the lower cloth CD, there has been a problem that the step portion is sewn by the lower roller 205 or the lower sensor 203 due to one-sided fall.
Furthermore, in the case of a sewing machine that has a feed dog that comes into contact with the lower cloth from below and a feed foot that comes into contact with the upper cloth from above, and that feeds the upper cloth and the lower cloth individually, the cloth feed direction There was also a case where the stepped portion D was lifted up by a feed leg when moving to the upstream side, causing a one-sided fall.

  An object of the present invention is to perform sewing while maintaining a double-opened state when a double-opening step portion is formed on a sewing object.

  According to the first aspect of the present invention, there is provided a feed leg for performing a feed operation by contacting an upper sewing product from above, and a lower workpiece, out of two sewing products placed on the needle plate. A feed dog that performs a feed operation in contact with the sewing product from below; an upper roller that contacts the upper sewing product from above on the upstream side of the feed foot in the feed direction; and moves in a direction perpendicular to the feed direction; An upper drive means for rotating the upper roller, a lower roller for moving in a direction perpendicular to the feed direction by contacting the lower sewing product from below at an upstream side in the feed direction of the feed dog, and the lower roller A lower drive means for rotating the upper side roller, a separation plate disposed between the upper roller and the lower roller arranged in the vertical direction, and sandwiching each workpiece by the upper roller and the lower roller, and the upper roller And between the feed leg and the front An upper detection means for detecting whether or not a side end portion of the upper sewing product is in a predetermined position in a direction orthogonal to the feed direction, and disposed between the lower roller and the feed dog, A lower side detecting means for detecting whether or not a side end portion of the side sewing product is in a predetermined position in a direction perpendicular to the feeding direction; and an upper side raising / lowering for moving the upper roller toward and away from the separating plate Means, lower elevating means for moving the lower roller toward and away from the separation plate, and upstream of the upper roller in the feed direction, facing the upper surface of the separation plate and moving in the feed direction A guide plate having a guide surface formed to have a low height, and a driving unit for each roller so that a side end portion of each sewing product is in a predetermined position based on a detection result of each detection unit. Control means for controlling In the up-and-down feed sewing machine, the control means controls the upper and lower lifting means to repeatedly contact and separate the upper roller when the stepped portion of the upper sewing product passes through the upper roller. It is characterized by performing.

  The invention according to claim 2 has the same configuration as that of the invention according to claim 1, and the first upper side that blows air downward from the guide surface of the guide plate or downstream in the feed direction or in the direction of synthesis thereof. Blower means is provided, and the control means performs operation control to perform spraying by the first upper blower means when the stepped portion of the upper sewing product passes through the guide plate. And

  The invention described in claim 3 has the same configuration as that of the invention described in claim 1 or 2, and is provided between the feed leg and the upper detection means, and from above with respect to the upper sewing product. A second upper blowing means for blowing air, and the control means performs the blowing by the second upper blowing means when a stepped portion of the upper sewing product passes through the upper detection means. The operation control is performed.

  The invention according to claim 4 has the same configuration as the invention according to any one of claims 1 to 3, and further includes a retracting means for retracting the feed leg upward, and the control means has the upper side When the stepped portion for sewing of the workpieces passes through the feed leg, operation control for executing a retracting operation by the retracting means is performed.

The invention according to claim 5 has the same configuration as that of the invention according to any one of claims 1 to 4, and the control means is configured such that the stepped portion for sewing the lower sewing product is the lower part. when passing through the side roller, and performs operation control to repeat perform the contact and separation movement of the lower rollers by the lower lifting means.

  The invention according to claim 6 has the same configuration as that of the invention according to any one of claims 1 to 5, and in the upstream or the feed direction or the combined direction thereof on the upstream side in the feed direction of the lower roller. A lower air blowing means for blowing air toward the lower air blowing means, and the control means executes the blowing by the lower air blowing means when the stepped portion of the lower sewing product passes through the lower roller. It is characterized by performing operation control.

  The invention according to claim 7 has the same configuration as that of the invention according to any one of claims 1 to 6, and the control means counts the number of stitches, and a step portion for sewing the sewing product. Is determined based on the counted number of needles, and operation control is executed.

  The invention according to claim 8 has the same configuration as that of the invention according to any one of claims 1 to 7, and detects a step formed on the upper sewing product or the lower sewing product. A step detecting unit that performs the operation control by determining the passage of the stepped portion of the sewing product based on the step detection by the step detecting unit. .

  According to the first aspect of the present invention, the upper roller can be repeatedly moved up and down by the upper roller ascending / descending movement, so even if the upper workpiece has a stepped portion for sewing, It is possible to pass the step portion when it rises, and it is possible to effectively eliminate the occurrence of the one-side fall of the step portion. Furthermore, since the upper roller that descends compresses the stepped portion, it becomes possible to flatten the stepped portion, and to prevent the stepped portion from being caught and tilted even when passing through the upper detection means located downstream of the upper roller.

According to the second aspect of the present invention, air is blown from the guide surface of the guide plate downward, downstream in the feed direction, or in the synthesis direction thereof by the first upper air blowing means, and therefore along the upper surface of the separation plate facing the guide surface. An air flow can be formed on the downstream side in the feed direction, and the step of the upper sewing product that passes through the guide plate can be prevented from curling up by the air flow from the rear, and can be prevented from falling down. It becomes.
In particular, by blowing air toward the downstream side in the feed direction or in the direction in which it is combined, an air flow is generated downstream in the feed direction due to a decrease in air pressure at the gap between the guide surface and the separation plate even on the upstream side of the blowing means. In addition, since the stepped portion is drawn to the downstream side, it is possible to more effectively prevent one-sided fall due to rolling up by the guide plate.

  In the invention according to claim 3, since the stepped portion compressed from the upper side by the upper roller passes through the upper side detecting means, the second upper blowing unit blows from the upper side, so the flat state of the stepped portion is maintained. In addition, it is possible to prevent the stepped portion from being lifted and tilted by the downstream feed leg.

  In the invention according to claim 4, it is possible to effectively prevent the one-side-down due to the rising of the stepped portion of the cloth caused by the feeding foot.

  In the invention according to claim 5, since the lifting operation by the lower roller moving means can be repeatedly performed by the lower lifting means, even if the lower sewing product has a stepped portion for sewing, When the lower roller is lowered, the step portion can be passed, and it is possible to effectively eliminate the occurrence of the one-sided fall of the step portion. Furthermore, since the lower roller that rises compresses the stepped portion, it is possible to flatten the stepped portion and prevent the stepped portion from being caught and tilted even when passing through the lower detection means on the downstream side of the lower roller. It becomes.

  According to the sixth aspect of the present invention, the air is blown upward or in the feed direction or the combined direction on the upstream side in the feed direction of the lower roller. It is possible to prevent the rising of the airflow from the airflow and to prevent the lower roller from collapsing.

  Since the invention according to claim 7 performs the operation control according to the counted number of stitches, the operation control can be performed at an appropriate timing according to where the step portion of the cloth is located in the feeding direction. Become.

  The invention according to claim 8 is provided with a step detection means for detecting a step formed on the upper sewing product or the lower sewing product, and therefore where the cloth step is positioned in the feeding direction. It is possible to accurately detect and control the operation at an appropriate timing with respect to the step position.

It is a perspective view of a vertical feed sewing machine. It is a schematic diagram which shows the needle drop vicinity. It is the perspective view which showed the mechanism regarding the drive of each roller. It is the perspective view from the lower part which showed the mechanism regarding the drive of a lower roller. It is the perspective view from the upper part which showed the mechanism regarding the drive of a lower roller. It is the perspective view from the upper part which showed the mechanism regarding the drive of an upper side roller. It is the perspective view from the upper part which showed the mechanism regarding the drive of an upper side roller. It is a perspective view of a cloth sensor. It is a schematic diagram explaining the detection of a cloth sensor. It is the top view which showed the structure of the cloth feed direction upstream side of a throat plate. It is a block diagram which shows the structure around a control apparatus. It is a flowchart of sewing control. It is explanatory drawing which shows the area setting in step part one fall prevention control. It is a flowchart of step part one fall prevention control. It is a perspective view of the upper cloth which has a step part. It is explanatory drawing which shows the structure around the needle plate of the conventional vertical feed sewing machine.

(Configuration of vertical feed sewing machine)
An embodiment of a vertical feed sewing machine 100 according to the present invention will be described.
The vertical feed sewing machine 100 sews two cloths (to-be-sewn products) placed on the needle plate while feeding them in the same direction. Further, the vertical feed sewing machine 100 includes rollers 3 and 7 that are in contact with upper and lower fabrics individually, and it is possible to perform sewage sewing by changing the vertical feed amount using the rollers 3 and 7. .
As shown in FIGS. 1 and 2, the vertical feed sewing machine 100 includes a cloth presser 19, a feed dog 1, a feed leg 2, a lower roller 3, a lower pulse motor 4, a lower connection mechanism 5, Lower solenoid 6, upper roller 7, upper pulse motor 8, upper coupling mechanism 9, upper solenoid 10, separation plate 11, guide plate 20, lower and upper cloth sensors 24 and 25, control Device 13.

(Feed dog)
As shown in FIG. 2, the feed dog 1 is in contact with the lower cloth C <b> 1 (hereinafter, referred to as the lower cloth) of the two cloths placed on the needle plate 14 so as to feed from below. I do. The feed dog 1 is driven by a feed dog forward / backward feed mechanism (not shown) that gives a reciprocating motion along the cloth feed direction and a feed dog vertical feed mechanism (not shown) that gives a reciprocating motion along the vertical direction. . Thereby, the feed dog 1 moves so as to draw an elliptical orbit in a side view below the needle plate 14, and protrudes from the needle plate 14 when the feed dog 1 moves upward, and comes into contact with the lower cloth from below. Hereinafter, the cloth feeding direction by the feed dog 1 is F.

(Cloth presser and feed leg)
As shown in FIG. 2, the feed leg 2 is in contact with the upper cloth C <b> 2 (hereinafter referred to as the upper cloth) of the two cloths stacked on the needle plate 14 from above and performs a feeding operation. The cloth presser 19 touches the upper cloth C2 from above and presses the cloth. The feed foot 2 is driven by a feed foot forward / backward feed mechanism (not shown) that gives a reciprocating motion along the cloth feed direction and a feed foot vertical feed mechanism (not shown) that gives a reciprocating motion along the vertical direction. The cloth presser 19 only moves up and down by the above-mentioned feed leg up-and-down feed mechanism. Thereby, the feed leg 2 moves to draw an elliptical orbit in a side view above the needle plate 14, and comes into contact with the upper cloth from above when the feed leg 2 moves downward. Further, the cloth presser 19 moves up and down alternately with the feed leg 2 at a fixed position. That is, while the cloth presser 19 is separated above the upper cloth C2, the feed leg 2 moves downward while moving the feed leg 2 to perform the upper cloth C2 feeding operation, and the cloth presser 19 moves to the upper cloth C2. While in contact, the feed leg 2 moves upward while returning to the upstream side in the feed direction.
Further, the feed foot up / down feed mechanism that supports the feed foot 2 is provided with a retracting electromagnetic solenoid 39 as a retracting means for forcibly retracting the feed foot 2 upward (moving away from the upper cloth C2). Therefore, regardless of the feeding operation, the feeding foot 2 can be forcibly retracted upward regardless of the feeding operation. The operation of the retracting electromagnetic solenoid 39 (see FIG. 11) is controlled by a control device 13 described later.

(Lower roller)
The lower roller 3 is disposed in the concave hole of the needle plate 14 so as to be movable up and down, is provided so as to protrude somewhat from the upper surface of the needle plate 14 when raised, and comes into contact with the lower cloth C1 from below to feed teeth 1. The cloth is moved in a direction intersecting (orthogonal to) the cloth feeding direction F and parallel to the upper surface of the needle plate 14. The lower roller 3 is rotatably supported by a lower coupling mechanism 5 (details will be described later). The outer surface of the lower roller 3 is formed in a sawtooth shape so that the lower roller 3 can reliably catch and move the cloth when contacting the cloth.
As shown in FIGS. 3 to 5, the lower roller 3 is connected to the output shaft of the lower pulse motor 4 by a belt 15 to be rotated.

(Lower pulse motor)
As shown in FIGS. 3 to 5, the lower pulse motor 4 is fixed to the base 16. The base 16 is provided with a swing arm 17 extending linearly. One end of the swing arm 17 is fixed to the base 16 together with the lower pulse motor 4, and the other end is a free end. The lower roller 3 is rotatably supported on the other end of the swing arm 17. The swing arm 17 is formed in a rod shape, and a belt 15 is stretched between the lower roller 3 and the output shaft of the lower pulse motor 4 so as to cover the swing arm 17. Thus, when the output shaft of the lower pulse motor 4 rotates, the rotation is transmitted to the lower roller 3 via the belt 15 to rotate the lower roller 3. That is, the lower pulse motor 4 functions as “lower drive means”.

(Lower connection mechanism)
As shown in FIGS. 3 to 5, the lower coupling mechanism 5 includes the base 16 and the swing arm 17, the rotating shaft 21, the drive lever 22, and the transmission link 23 described above.
The base 16 to which the lower pulse motor 4 is fixed is formed in a pentagonal shape, and a rotating shaft 21 is provided at one corner thereof.
The rotating shaft 21 is rotatably supported by the sewing machine frame, and the direction of the shaft is parallel to the output shaft of the lower pulse motor 4. One end thereof is fixed to the base 16, and the base 16 rotates with the rotation of the rotary shaft 21. A drive lever 22 is provided at the other end of the rotating shaft 21.
The drive lever 22 is a rod-like plate material extending in the radial direction with the rotation shaft 21 as the center, and the rotation shaft 21 is clamped and fixed at one end thereof. One end of the transmission link 23 is connected and fixed to the other end of the drive lever 22 with a screw or the like.
The transmission link 23 is a plate material extending in the extending direction of the drive lever 22, and the plunger 62 of the lower solenoid 6 can come into contact with the other end of the transmission link 23 from below.
That is, the lower solenoid 6 is arranged so that the plunger 62 can move in the vertical direction. When the plunger 62 is extended, the transmission link 23 is pushed up, and when the plunger 62 is contracted, the transmission link 23 is not supported and moves downward. An urging member such as a spring that urges the transmission link 23 to move downward may be provided. That is, the transmission link 23 may be moved upward by the lower solenoid 6 and moved downward by the spring. Here, the housing 60 of the lower solenoid 6 is provided with a support base 61, and supports the transmission link 23 from below when the plunger 62 is not driven.

(Lower solenoid)
As shown in FIGS. 3 to 5, the lower solenoid 6 is arranged such that the plunger 62 moves along the vertical direction of the sewing machine (the vertical direction of the needle). The lower solenoid 6 changes the amount of movement of the plunger 62 in accordance with the amount of current that is energized. Thereby, the lower solenoid 6 can adjust the pressing force against the cloth via the lower roller 3 in accordance with the amount of current supplied.

The lower solenoid 6 is attached in a direction to drive the plunger 62 in a direction in which the plunger 62 is drawn by energizing the coil. Then, the thrust for pulling the plunger 62 is increased as the energization current increases.
The lower solenoid 6 generates a thrust proportional to the square of the applied current. That is, the amount of change in thrust with respect to current change increases as the generated thrust increases. For this reason, a small amount of change can be obtained with a small thrust, and a slight change in pressing force can be achieved. With a large thrust, a large amount of change can be obtained and the pressing force can be changed with a relatively large width. The pressing force can be easily adjusted.
That is, the lower solenoid 6 functions as “lower lifting means”.

(Upper roller)
As shown in FIGS. 3, 6, and 7, the upper roller 7 is provided above the throat plate 14 so as to be movable up and down. The cloth is moved in a (perpendicular) direction parallel to the upper surface of the needle plate 14. The upper roller 7 is rotatably supported by an upper coupling mechanism 9 (details will be described later). The outer surface of the upper roller 7 is formed in a sawtooth shape so that the upper roller 7 can reliably catch and move the cloth when it comes into contact with the cloth.
The upper roller 7 is connected to the output shaft of the upper pulse motor 8 by a belt 18 to be rotated.

(Upper pulse motor)
The upper pulse motor 8 is fixed to the base 31. The upper pulse motor 8 is provided with a swing arm 32 extending linearly. One end of the swing arm 32 is fixed to the upper pulse motor 8, and the other end is a free end. The upper roller 7 is rotatably supported at the other end of the swing arm 32. The swing arm 32 is formed in a plate shape, and the belt 18 is stretched between the upper roller 7 and the output shaft of the upper pulse motor 8 so as to cover the swing arm 32. Thereby, when the output shaft of the upper pulse motor 8 rotates, the rotation is transmitted to the upper roller 7 via the belt 18 to rotate the upper roller 7. That is, the upper pulse motor 8 functions as an “upper drive unit”.

(Upper coupling mechanism)
The upper coupling mechanism 9 includes the base 31 and the swing arm 32, the rotation shaft 33, the drive lever 34, the transmission link 35, and the rotation link 36 described above.
The base 31 to which the upper pulse motor 8 is fixed is formed in a pentagonal shape, and a rotation shaft 33 is provided at one corner thereof.
The rotating shaft 33 is rotatably supported by the sewing machine frame, and the direction of the shaft is parallel to the output shaft of the upper pulse motor 8. One end of the base 31 is fixed to the base 31, and the base 31 rotates with the rotation of the rotary shaft 33. A drive lever 34 is provided at the other end of the rotating shaft 33.
The drive lever 34 is a plate material extending in the radial direction around the rotation shaft 33, and the rotation shaft 33 is clamped and fixed at one end thereof. One end of a transmission link 35 is rotatably connected to the other end of the drive lever 34.
The transmission link 35 is a rod-like plate material extending in a direction substantially orthogonal to the drive lever 34, and a plurality of connection holes 35a are formed along the longitudinal direction thereof. One end of a rotary link 36 is rotatably connected to the other end of the transmission link 35.
The rotary link 36 is rotatably supported by a plate material 71 attached to the housing 70 of the upper solenoid 10 in the vicinity of the center portion thereof. The other end of the rotary link 36 is rotatably connected to a plunger 72 that serves as an output shaft of the upper solenoid 10. The rotary link 36 is disposed substantially parallel to the drive lever 34.

(Upper solenoid)
The upper solenoid 10 is arranged such that the plunger 72 moves along the moving direction (longitudinal direction) of the transmission link 35.
The upper solenoid 10 includes a housing 70, a plunger 72, and the like. Since the internal configuration of the upper solenoid 10 is the same as that of the lower solenoid 6, the description thereof is omitted.
That is, the upper solenoid 10 functions as “upper lifting means”.

(Separator)
As shown in FIG. 6, one end of the separation plate 11 is fixed to the bottom surface of the support plate 44 by screws (not shown). A guide plate 20 (not shown) is screwed to the upper surface of the support plate 44. The support plate 44 is connected to an adjustment dial 45 shown in FIG. 1 via a rack and a pinion gear (not shown). When the adjustment dial 45 is rotated, the position of the separation plate 11 and the guide plate 20 is adjusted with respect to the direction G perpendicular to the cloth feeding direction.
The separation plate 11 fixed to the bottom surface of the support plate 44 is disposed above the needle plate 14 between the upper roller 7 and the lower roller 3. The separation plate 11 is bent so that the tip of the separation plate 11 is lifted from the needle plate 14 when attached to the needle plate 14. Further, the separating plate 11 extends to the upstream side in the distribution feed direction from the rollers 3 and 7. That is, the separation plate 11 can divide the space on the needle plate 14 up and down, and the upper cloth C2 is sent to the upper side of the separation plate 11 and the lower cloth C1 is sent to the lower side.
Thus, the separation plate 11 is disposed between the two cloths C1 and C2, and the lower cloth 3 is sandwiched between the lower roller 3 and the lower surface of the separation plate 11, and the upper roller 7 and the upper surface of the separation plate 11 are sandwiched. Insert the upper cloth C2.

  The guide plate 20 is attached to the upper surface of the support plate 44 with screws so as to be disposed on the upper side of the separation plate 11. The guide plate 20 has a lower surface facing the upper surface of the separation plate 11 and a gap through which the upper cloth C2 passes. The end of the guide plate 20 on the downstream side in the cloth feeding direction extends to the front of the upper roller 7, and the lower surface of the guide plate 20 guides the upper cloth C 2 into the gap between the upper roller 7 and the separation plate 11. Functions as a guide surface. Further, the upstream end portion of the guide plate 20 in the cloth feeding direction extends to the upstream side from the end portion of the separation plate 11, and the guide surface gradually goes upward as it goes upstream. It is formed so as to be curved. The radius of curvature of the guide surface of the guide plate 20 is desirably set as large as possible from the viewpoint of preventing the one-side falling when the step portion is formed on the upper cloth C2. However, when the radius of curvature is set to be excessively large, the guide plate 20 becomes almost parallel to the separation plate 11 and is easy to insert the upper cloth C2 between the guide plate 20 and the separation plate 11. Since the guide function is impaired, it is desirable to set the curvature radius in consideration of the harmony between the guide function and the effect of preventing the stepped portion from falling down.

(Cloth sensor)
As shown in FIGS. 8 and 9, the lower and upper cloth sensors 24 and 25 are used to keep the seam allowance (the length from one side edge (referred to as the cloth edge) of the cloth to the seam) constant during sewing. Whether or not the end is in a predetermined position is detected. As shown in FIG. 2, the cloth sensors 24 and 25 are provided close to the downstream side in the cloth feeding direction with respect to the lower roller 3 and the upper roller 7, respectively. As shown in FIGS. 8 and 9, these cloth sensors 24 and 25 are held by a common sensor base 41, are horizontally arranged, and are opposed to each other with a reflecting plate 46 whose both surfaces are reflecting surfaces. Has been. Each of the cloth sensors 24 and 25 includes a cloth presence sensor 42 on the front side and a cloth edge sensor 43 on the back side.
The sensor base 41 is formed in a substantially U shape when viewed from the cloth feeding direction F, and the above-described reflecting plate 46 is held horizontally inside the sensor base 41. The cloth moving direction by the rollers 3 and 7 (hereinafter, the cloth moving direction by the upper and lower rollers 3 and 7 is referred to as the adjustment direction G, and the cloth feeding direction is provided on the inner lower surface and the inner upper surface of the U-shaped portion. In the right direction (left side in FIG. 8) is the forward direction and the left hand direction (right direction in FIG. 8 is the reverse direction). Recesses 41a and 41b are formed. Then, the reflection plate 46 is disposed at a position slightly higher than the upper surface of the needle plate 14 so as to be inserted between the lower fabric C1 and the upper fabric C2 that are conveyed while being stacked on the needle plate 14. .
Thus, the lower cloth C1 passes inside the U-shaped part of the sensor base 41 and passes between the reflector 46 and the lower concave part 41a, and the upper cloth C2 is inside the U-shaped part of the sensor base 41. Thus, it passes between the reflector 46 and the upper concave portion 41b.

Each recess 41a, 41b is formed in a V shape when viewed from the adjustment direction G.
On the two inclined surfaces of the recesses 41a and 41b, a cloth presence / absence sensor 42 including a light emitting sensor 42a and a light receiving sensor 42b is provided on the front side (opposite to the adjustment direction G). The cloth presence sensor 42 on the upper wall surface is a sensor that detects whether there is an upper cloth C2, and the cloth presence sensor 42 on the lower wall surface is a sensor that detects whether there is a lower cloth C1.
On the two inclined surfaces of the recesses 41a and 41b, a cloth end sensor 43 including a light emitting sensor 43a and a light receiving sensor 43b is provided on the back side (near the opposite direction of the adjustment direction G). The cloth edge sensor 43 on the upper wall surface (41b side) is a sensor that detects whether the cloth edge of the upper cloth C2 is in a predetermined position, and the cloth edge sensor 43 on the lower wall surface (41a side) is the lower cloth C1. It is a sensor which detects whether the cloth edge is in a predetermined position.
The reflecting plate 46 reflects the light emitted from the light emitting sensors 42a and 43a. If there is no cloth edge on the optical path, the light reflected by the reflecting plate 46 has high intensity and the light receiving sensors 42b, Light is received at 43b.

With the above structure, the upper cloth C2 can enter between the reflecting plate 46 and the cloth presence sensor 42 and the cloth end sensor 43 on the upper wall surface, and the lower cloth C1 can be inserted between the reflecting plate 46 and the cloth presence sensor 42 on the lower wall surface. It is possible to enter between the cloth end sensor 43. If the cloth has entered, since the cloth blocks the light from the light emitting sensors 42a and 43a and is not reflected by the reflecting plate 46, the light receiving sensors 42b and 43b cannot detect the light. Using this principle, the presence / absence of cloth and the edge of the cloth are detected.
That is, the lower cloth sensor 24 functions as “lower detection means”, and the upper cloth sensor 25 functions as “upper detection means”.

(Blower means)
The vertical feed sewing machine 100 is a case where a step D is formed by stitching two pieces of cloth on the upper cloth C2 or the lower cloth C1, and the cloth ends are sewn in a direction orthogonal to the stitched seam in a double-open state. In this case, in order to prevent the one-sided fall of the step portion D, first to third upper air blowing means for blowing air to the upper cloth C2 and lower air blowing means for blowing air to the lower cloth C1 are provided. .

As shown in FIGS. 1 and 2, the first upper blowing means includes a first upper nozzle 27 provided on the guide plate 20, a pneumatic source (not shown), and a first pneumatic nozzle 27 connected to the first upper nozzle 27 from the pneumatic source. It is mainly comprised from the 1st upper side solenoid valve 28 (refer FIG. 11) which supplies and stops compressed air.
The first upper nozzle 27 is opened obliquely downward on the guide surface (lower surface) of the guide plate 20, and is perpendicular to the upper surface of the conveyed upper cloth C2 and downstream in the cloth feeding direction. It is possible to blow air toward the diagonally downward direction, which is the direction of synthesis with the direction. Accordingly, it is possible to effectively prevent the one-sided fall due to the rising of the stepped portion D by the upper roller 7 located immediately downstream.
The air pressure source is composed of, for example, an air compressor or a motor fan that is commonly used for all the air blowing means.
The operation of the first upper electromagnetic valve 28 is controlled by a control device 13 described later, and air is blown at a predetermined timing during sewing.
Note that the air blowing direction by the first upper nozzle 27 is not limited to the above-described oblique direction, and may be either the vertically downward direction or the downstream direction of the cloth feeding direction. Even if blown vertically downward, the air travels along the upper surface of the separation plate 11, so that an air flow downstream from the nozzle position in the cloth feeding direction can be obtained, and the step portion The effect of preventing D from falling down can be obtained.

As shown in FIGS. 1 and 2, the second upper air blowing means includes a second upper nozzle 29 provided between the upper cloth sensor 25 and the feed leg 2, an air pressure source (not shown), and a second upper air blowing means. The nozzle 29 is mainly composed of a second upper solenoid valve 30 (see FIG. 11) that supplies and stops compressed air from the air pressure source.
The second upper nozzle 29 is opened vertically downward in the above arrangement, and allows air to be blown vertically downward on the upper surface of the transported upper cloth C2. . Since the second upper nozzle 29 is positioned downstream of the upper roller 7 in the cloth feeding direction, the step D of the upper cloth C2 compressed by the upper roller 7 and passed through the upper cloth sensor 25 is blown from above. It is possible to maintain the double-opened state at both ends of the cloth end by performing the attachment, and it is possible to prevent the stepped portion D from being lifted by the feed foot 2 on the downstream side, thereby preventing the one-sided collapse due to this. .
The air pressure source is shared with the first upper air blowing means.
The operation of the second upper solenoid valve 30 is controlled by a control device 13 described later, and air is blown at a predetermined timing during sewing.
The air blowing direction by the second upper nozzle 29 is not limited to the vertical downward direction, but may be a downstream direction in the cloth feeding direction or an oblique direction in which the vertical downward direction and the downstream direction in the cloth feeding direction are combined. .

As shown in FIGS. 1 and 2, the third upper air blowing means includes a third upper nozzle 37 provided between the upper roller 7 and the upper cloth sensor 25, an air pressure source (not shown), and a third upper air source. The nozzle 37 is mainly composed of a third upper solenoid valve 38 (see FIG. 11) for supplying and stopping compressed air from a pneumatic pressure source.
The third upper nozzle 37 is opened vertically downward in the above arrangement, and allows air to be blown vertically downward on the upper surface of the transported upper cloth C2. . Since the third upper nozzle 37 is disposed adjacent to the downstream side of the upper roller 7 in the cloth feeding direction, the edge of the cloth is blown by blowing the step D of the upper cloth C2 compressed by the upper roller 7 from above. It is possible to maintain the double-opened state at both ends, and to prevent one-side falling by the upper cloth sensor 25 on the downstream side.
The air pressure source is shared with the first and second upper air blowing means.
The operation of the third upper solenoid valve 38 is controlled by a control device 13 described later, and air is blown at a predetermined timing during sewing.
The air blowing direction by the third upper nozzle 37 is not limited to the vertical downward direction, but may be a downstream direction in the cloth feeding direction or an oblique direction in which the vertical downward direction and the downstream direction in the cloth feeding direction are combined. .

FIG. 10 is a plan view showing a configuration of the needle plate 14 on the upstream side in the cloth feeding direction.
As shown in FIGS. 2 and 10, the lower air blowing means includes first and second lower nozzles 47 and 48 provided adjacent to the upstream side of the lower roller 3 in the cloth feeding direction, and an air pressure source (not shown). And a lower solenoid valve 49 (see FIG. 11) for supplying and stopping compressed air from the air pressure source to the first and second lower nozzles 47, 48.
The first lower nozzle 47 is opened vertically upward in the above arrangement, and allows air to be blown vertically upward on the lower surface of the conveyed lower cloth C1. . By the first lower nozzle 47, it is possible to effectively prevent the lower roller 3 located immediately downstream or the one-sided fall due to the rising of the step portion D caused by the concave portion in which the lower roller 3 is stored.
The second lower nozzle 48 is opened toward the downstream side in the cloth feeding direction in the above arrangement, and air is blown toward the downstream side in the cloth pressing and feeding direction with respect to the lower surface of the lower cloth C1 being conveyed. It makes it possible to apply
Accordingly, the second lower nozzle 48 can effectively prevent the lower roller 3 located immediately downstream or the one-side-down due to the stepped portion D from being raised by the concave portion in which the lower roller 3 is stored. Since the air is blown almost horizontally, the air reaches farther, and it is possible to effectively prevent the side cloth D from being tilted up by the lower cloth sensor 24 positioned further downstream of the lower roller 3. Can do.
The air pressure source is shared with each upper air blowing means.
The operation of the lower solenoid valve 49 is controlled by a control device 13 to be described later, and air is blown at a predetermined timing during sewing.
The first and second lower nozzles 47 and 48 may not be used, but only one of them may be used, or an oblique direction in which the vertically upward direction and the cloth feed direction downstream direction are combined. A single lower nozzle that sprays on the surface may be used.

(Control device)
As shown in FIG. 11, the control device 13 includes a CPU 51 that performs various arithmetic processes, a ROM 52 that stores a program related to the drive control of each configuration described above, and a RAM 53 that stores various data related to the processing of the CPU 51 in a work area. And.
Further, the control device 13 includes the pulse motors 4 and 8, the solenoids 6 and 10, the cloth presence / absence sensors 42 and 42, the cloth edge sensors 43 and 43, and the electromagnetic valves 28 and 40 in the air blowing units. 30, 38, 49 and the retracting electromagnetic solenoid 39 of the feed leg 2 are connected to each other via a drive circuit or an interface (not shown).
Then, when the cloth presence / absence sensors 42 and 42 in the lower and upper cloth sensors 24 and 25 detect the cloth, the control device 13 detects the cloth edge sensors 43 and 43 and detects the cloth result. Based on this, the rotation direction and the rotation amount of each roller 3, 7 are determined, and each pulse motor 4, 8 is driven. Further, the control device 13 drives the solenoids 6 and 10 in order to adjust the pressing force of the cloths by the rollers 3 and 7 according to the amount of squeezing when performing staking sewing.

  Specifically, when the side edge of the lower cloth C1 (upper cloth C2) is detected by the cloth end sensor 43 as part of the sew stitch control, the control device 13 lowers the lower roller 3 (upper roller 7). Controls the lower pulse motor 4 (upper pulse motor 8) to move the lower cloth C1 (upper cloth C2) in the reverse direction in the adjustment direction G, and the cloth end sensor 43 controls the lower cloth C1 (upper cloth C2) side. When the end is no longer detected, the lower pulse motor 4 (upper pulse motor 8) is moved by the lower roller 3 (upper roller 7) to move the lower cloth C1 (upper cloth C2) in the positive direction in the adjustment direction G. Control.

  Moreover, the control apparatus 13 prevents the step part D from falling down when the upper cloth C2 and the lower cloth C1 have the step part D along the direction crossing the cloth feeding direction F as the step part falling prevention control. In order to do this, the number of stitches from the start of sewing is counted, and according to the number of stitches, the solenoid valves 28, 30, 38, 49, the retracting solenoid solenoid 39, the lower solenoid 6, the upper solenoid 10 of each blower means. Control the operation.

  Specifically, the CPU 51 of the control device 13 determines that the count value of the number of stitches from the start of sewing becomes a numerical value indicating the approach of the step portion D to the nozzles 27, 29, 37, 47, 48 of each blowing means. Control is performed to open the corresponding solenoid valves 28, 30, 38, and 49 and to blow air until a numerical value indicating passage is obtained.

Further, the CPU 51 of the control device 13 controls the corresponding solenoids until the count value of the number of stitches from the start of sewing becomes a numerical value indicating the passage from the numerical value indicating the approach of the step portion D to each of the rollers 3 and 7. 6 and 10 are subjected to ON-OFF control at a predetermined repetition period, and operation control is performed so that each of the rollers 3 and 7 repeats vertical movement. Before and after the passage of the step portion D, the solenoids 6 and 10 are driven and controlled so that the rollers 3 and 7 press the lower cloth C1 and the upper cloth C2 with a predetermined pressing force.
Thereby, when each roller 3 and 7 leaves | separates from the lower cloth C1 or the upper cloth C2, the step part D can be allowed to pass through, and the one-sided fall by the step part D being rolled up by each roller 3 and 7 is effective. Can be prevented.
Also, as described above, the side edge position adjustment control of the lower cloth C1 and the upper cloth C2 is executed in parallel when the vertical movement of the rollers 3 and 7 is performed. 3 and 7 repeatedly move up and down, so that when the lower cloth C1 and the upper cloth C2 are contacted, the movement adjustment of each cloth in the adjustment direction G can be performed, and the effect of the side edge position adjustment control is achieved. Is designed to remain intact.

Further, the CPU 51 of the control device 13 is for retracting the feed leg 2 until the count value of the number of stitches from the start of sewing becomes a value indicating the passage after the count value indicating the approach of the step portion D to the feed leg 2. Operation control is performed so as to operate the electromagnetic solenoid 39 in the upward direction.
Thereby, when the feed leg 2 is raised, the step portion D of the upper cloth C2 can be passed, and it is possible to effectively prevent the one-side-down due to the step portion D being lifted by the feed foot 2. It becomes.

(Upper and lower feed sewing machine operation: sewing control)
By performing each control described above, the control device 13 functions as a “control unit”.
Next, the operation of the vertical feed sewing machine will be described. First, the position adjustment control of the side end portions of the cloths C1 and C2 when performing shampooing will be described. Hereinafter, since the sewing control for the upper cloth C2 is performed in the same manner as the sewing control for the lower cloth C1, in the following description, the lower cloth C1 will be mainly described, and the same control contents for the upper cloth C2 are attached in parentheses. I will explain it.
As shown in FIG. 12, when performing sewing, the control device 13 determines whether or not the cloth presence sensor 42 has detected the front end position of the lower cloth C1 (upper cloth C2) (step S1).
In step S1, if the control device 13 determines that the cloth presence sensor 42 has detected the lower cloth C1 (upper cloth C2) (step S1: YES), the control apparatus 13 turns the lower solenoid 6 (upper solenoid 10). The lower roller 3 (upper roller 7) is raised (lowered) by driving (step S2). Further, the control device 13 drives the lower pulse motor 4 (upper pulse motor 8) in the positive direction in the adjustment direction G (step S3). As a result, the lower roller 3 (upper roller 7) contacts the lower cloth C1 (upper cloth C2) while rotating. When the lower roller 3 (upper roller 7) comes into contact with the lower cloth C1 (upper cloth C2), the lower roller 3 (upper roller C2) rotates to cause the lower cloth C1 (upper cloth C2) to move into the recess 41a of the sensor base 41. It is drawn into (concave part 41b).
Next, the control device 13 determines whether or not the cloth end sensor 43 has detected the lower cloth C1 (upper cloth C2) (step S4).
In step S4, when the control device 13 determines that the cloth edge sensor 43 has detected the lower cloth C1 (upper cloth C2) (step S4: YES), the control apparatus 13 determines that the lower pulse motor 4 (upper pulse motor 8). ) Is switched in the reverse direction of the adjustment direction G (step S5). Further, when the cloth end sensor 43 does not detect the lower cloth C1 (upper cloth C2) (step S4: NO), the control device 13 drives the lower pulse motor 4 (upper pulse motor 8) in the adjustment direction G. (Step S6).

Next, the control device 13 determines whether or not the cloth presence sensor 42 continues to detect the lower cloth C1 (upper cloth C2) (step S7). If it continues (step S7: YES), the process returns to step S4, and the cloth end is detected again.
If the cloth presence / absence sensor 42 no longer detects the lower cloth C1 (upper cloth C2) (step S7: NO), it is assumed that the end of the lower cloth C1 (upper cloth C2) has passed the sensor position. The driving of the side pulse motor 4 (upper pulse motor 8) is stopped (step S8), and control is performed so that the lower roller 3 is lowered (upper roller 7 is raised) with respect to the lower solenoid 6 (upper solenoid 10) ( Step S9), the operation control is terminated.

Further, the control device 13 executes the sew sewing control from the start to the end of the sewing. Sewing stitching is performed according to sewing data stored in advance in a memory or the like. For example, when the upper cloth C2 has a longer edge than the lower cloth C1, the lower solenoid 6 is controlled at the edge of the upper cloth C2 to increase the pressing force of the lower cloth C1 by the lower roller 3. Carry out sprain sewing. On the contrary, when the lower cloth C1 is long, the upper solenoid 10 is controlled to increase the pressing force of the upper cloth C2 by the upper roller 7 and perform the sewing.
Thus, the amount of squeezing can be changed by controlling the pressure applied to each of the rollers 3 and 7.

(Upper and lower feed sewing machine operation: Stepped part tilting prevention control)
Next, based on FIGS. 13 and 14, the control unit 13 performs the above-described blowing operation by the air blowing means, the vertical movement operation of the rollers 3, 7, and the stepped-up side fall prevention control in which the feed foot 12 is retracted upward. explain.
As a premise of the stepped part falling prevention control, the control device 13 sets a plurality of control sections determined in advance by the number of stitches from the start of sewing. FIG. 13 is an explanatory diagram of the control section.
The first section H1 is a section determined by the number of stitches until the step portion D of the cloth C1, C2 reaches the lower side of the guide plate 20 and passes through.
The second section H2 is a section determined by the number of stitches that reach before the rollers 3 and 7 of the cloth C1 and C2 and pass between the rollers.
The third section H3 is a section determined by the number of stitches until the step D of the cloths C1 and C2 reaches before the sensors 24 and 25 and passes between the sensors.
The fourth section H4 is a section determined by the number of stitches until the step D of the cloths C1 and C2 reaches the front of the feed leg 2 and passes below the feed leg 2.
The number of start stitches and the number of end stitches in each of the sections H1 to H4 are set by teaching using sample cloths C1 and C2 performed before sewing. That is, the front ends of the cloths C1 and C2 are set on the cloth presser 19, sewing is started and counting of the number of stitches is started. The cloth step D is formed by the guide plate 20, the rollers 3 and 7, When the respective positions of the sensors 24 and 25 and the feed leg 12 are reached, a command is input to store the number of stitches at that time by the operation panel 40. Similarly, when each position is passed, the operation panel 40 inputs a command to store the number of stitches at that time. As a result, the number of start stitches and the number of end stitches of each section H1 to H4 are recorded in the control device 13.

Next, the stepped part fall-down prevention control will be described in detail with reference to the flowchart of FIG.
The control device 13 starts counting the number of stitches together with the start of sewing (step S21).
Then, it is determined whether the number of count stitches has reached the start stitch number of the first section H1 (step S22), and if not, the determination is repeated. When the number of start stitches in the first section H1 is reached, the control device 13 controls the first upper solenoid valve 28 and the lower solenoid valve 49 to control the first upper nozzle 27 and the first and second lower solenoid valves 49. Air blowing from the nozzles 47 and 48 is started (step S23).

  Next, the control device 13 determines whether the count stitch number has reached the start stitch number of the second section H2 (step S24), and repeats the determination if not reached. Further, when the number of start stitches in the second section H2 is reached, the control device 13 controls the upper and lower solenoids 10 and 6 to start up and down movement of the lower roller 3 and the upper roller 7 (step S25). The timing of this vertical movement (also referred to as contact / separation operation) is set so that the lower roller 3 and the upper roller 7 are moved up and down once per needle in synchronism with the vertical movement of the needle bar according to the setting of the operation panel 40. Alternatively, it can be arbitrarily set to move up and down twice per stitch, or move up and down once per two stitches. Although both the lower roller 3 and the upper roller 7 may be moved up and down, it can be set from the operation panel so that one of the lower roller 3 and the upper roller 7 is moved up and down by the sewing product. With this setting, the control means performs the contacting / separating operation intermittently in synchronization with the vertical movement of the needle bar.

Next, the control device 13 determines whether the count stitch number has reached the start stitch number of the third section H3 (step S26), and repeats the determination if not reached. When the number of start stitches in the third section H3 is reached, the control device 13 controls the first upper solenoid valve 28 and the lower solenoid valve 49 to control the first upper nozzle 27 and the first and second lower solenoid valves 49. Air blowing from the nozzles 47 and 48 is stopped. Further, the upper and lower solenoids 10 and 6 are controlled to stop the lower roller 3 and the upper roller 7 at the cloth pressing position (step S27).
Further, the control device 13 controls the third upper solenoid valve 38 to start blowing air from the third upper nozzle 37 (step S28).

Next, the control device 13 determines whether the count stitch number has reached the start stitch number of the fourth section H4 (step S29), and repeats the determination if not reached. When the number of start stitches in the fourth section H4 is reached, the control device 13 controls the third upper solenoid valve 38 to stop the blowing of air from the third upper nozzle 37 and The upper solenoid valve 30 is controlled to start blowing air from the second upper nozzle 29 (step S30).
Further, the control device 13 controls the retracting electromagnetic solenoid 39 to retract the feed leg 2 upward (step S31).

  Next, the control device 13 determines whether the count stitch number has reached the end stitch number of the fourth section H4 (step S32), and repeats the determination if not reached. When the number of stitches in the fourth section H4 is reached, the control device 13 controls the second upper solenoid valve 30 to stop the blowing of air from the second upper nozzle 29, and the retraction electromagnetic Control is performed to control the solenoid 39 so as to return the feed foot 2 to a height at which it can be fed downward (step S33).

  In the above-described example, the number of end stitches in the first section H1 and the number of start stitches in the second section H2 match, and the number of end stitches in the second section H2 and the number of start stitches in the third section H3 match. Since the number of stitches at the end of the third section H3 and the number of stitches at the start of the fourth section H4 are the same, the determination of reaching the number of stitches at the start of the second to fourth sections is completed at the same time. Although the description has been made assuming that the number of stitches is determined, when the setting is made so that they do not match, the determination may be performed individually.

  The section is set on the assumption that the step D of the lower cloth C1 and the upper cloth C2 are in the same position in the cloth feeding direction F, but the position of the step D is different between the cloths C1 and C2. Alternatively, the section may be set separately for the lower side and the upper side.

In addition, when the rollers 3 and 7 are moved up and down in the stepped part fall-down prevention control, the pressing force for changing the vertical feed amount cannot be obtained at the time of raising the roller at the time of sewage sewing. Sewing sewing can be performed by making the upper and lower pressing forces different.
Note that the stepped part fall-down prevention control is not limited to false sewing, and may be performed for normal main sewing or other sewing.

(Effect)
In the vertical feed sewing machine 100, the lower roller 6 and the upper solenoid 10 can repeatedly raise and lower the lower roller 3 and the upper roller 7, so that each of the cloths C1 and C2 has a sewing step D. However, when the rollers 3 and 7 are separated from the cloth, the step portion D can be passed, and the occurrence of the one-side fall of the step portion can be effectively eliminated.
Further, since the rollers 3 and 7 compress the step portion D, the step portion is flattened, and the step portion D is caught and tilted even when the sensors 24 and 25 on the downstream side of the rollers 3 and 7 pass. It becomes possible to deter.

Further, since the vertical feed sewing machine 100 blows air by the first to third upper air blowing means and the lower air blowing means, the stepped portions D of the cloths C1 and C2 are prevented from being rolled up by the air flow from the rear, It becomes possible to prevent one side fall.
In particular, the nozzle 27 of the first upper air blowing means blows in an oblique direction including a direction component downstream in the cloth feeding direction, so that the nozzle 27 is provided between the guide surface of the guide plate 20 and the separation plate 11. An air flow toward the downstream side in the cloth feeding direction can also be formed on the upstream side of the blow-out port, and it is possible to effectively prevent the step portion D from rising and falling down by the guide plate 20.

Furthermore, since the vertical feed sewing machine 100 retracts the feed foot 2 upward when the step portion D approaches and passes, it effectively prevents the tilting of the step portion D of the upper cloth C2 caused by the feed foot 2 from falling down. Is possible.
Moreover, since the control apparatus 13 performs various operation control according to the counted needle | hook number, operation control is carried out at an appropriate timing according to where the step part D of each cloth C1, C2 is located in a feed direction. Can be performed.

(Other)
In the control device 13, the stepped part fall-down prevention control is performed by teaching the number of stitches. However, the start stitch number and the end stitch number of each section may be set directly from the operation panel 40 by numerical input. Needless to say.
Further, each section may be set by the feed amount (length) from the start of sewing without using the number of stitches.

  Furthermore, a step detection means for detecting the step D for each of the lower cloth and the upper cloth is arranged at the start position and the end position of each section H1 to H4 without counting the number of stitches or measuring the feed amount. However, it may be controlled to execute the stepped part fall-down prevention control based on the detection at each position. In this case, the step detection means that detects the change in thickness by pressing against the cloth, the one that reads the change in thickness of the cloth by distance detection, the one that reads the visual image change of the step by imaging, etc. Is done.

In addition, an actuator such as an air cylinder is provided that supports each of the rollers 3 and 7 and each of the cloth sensors 24 and 25 so as to be movable along the adjustment direction G and retracts from the extended line of the sewing position. Operation control for retracting the rollers 3 and 7 and the cloth sensors 24 and 25 individually may be performed.
In particular, the rollers 3 and 7 have little effect even if they are retracted when passing through the step portion D if no shampooing is performed, so that the stepped portion can be effectively prevented from falling down. It becomes possible to do.

1 Feed dog 2 Feeding foot 3 Lower roller 4 Lower pulse motor (lower drive means)
5 Lower coupling mechanism 6 Lower solenoid (lower lifting means)
7 Upper roller 8 Upper pulse motor (upper drive means)
9 Upper coupling mechanism 10 Upper solenoid (upper lifting means)
11 Separator 12 Cloth sensor (detection means)
13 Control device (control means)
14 Needle plate 20 Guide plate 24 Upper cloth sensor (upper detection means)
25 Lower cloth sensor (lower detection means)
27 First upper nozzle (first upper air blowing means)
28 1st upper side solenoid valve (1st upper side ventilation means)
29 Second upper nozzle (second upper air blowing means)
30 Second upper solenoid valve (second upper blowing means)
39 Retraction electromagnetic solenoid (retraction means)
47 First lower nozzle (lower air blowing means)
48 Second lower nozzle (lower air blowing means)
49 Lower solenoid valve (lower air blower)
100 Vertical feed sewing machine C1 Lower cloth C2 Upper cloth

Claims (8)

Of the two sewing products that are placed on the needle plate, the feeding foot that performs the feeding operation in contact with the upper sewing product from above,
A feed dog that performs a feed operation by contacting the lower sewing product from below;
An upper roller that is in contact with the upper sewing product from above on the upstream side in the feed direction of the feed foot and moves in a direction perpendicular to the feed direction;
Upper drive means for rotating the upper roller;
A lower roller that is in contact with the lower sewing product from below on the upstream side in the feed direction of the feed dog and moves in a direction perpendicular to the feed direction;
Lower drive means for rotating the lower roller;
A separation plate disposed between the upper roller and the lower roller arranged vertically, and sandwiching each workpiece with the upper roller and the lower roller;
An upper detection means that is disposed between the upper roller and the feed leg and detects whether or not a side end portion of the upper sewing product is in a predetermined position in a direction orthogonal to the feed direction;
A lower detection means that is disposed between the lower roller and the feed dog and detects whether or not a side end portion of the lower sewing product is in a predetermined position in a direction orthogonal to the feed direction; ,
Upper lifting means for moving the upper roller toward and away from the separation plate;
Lower elevating means for moving the lower roller toward and away from the separation plate;
A guide plate provided on the upstream side in the feed direction of the upper roller, and having a guide surface formed so as to face the upper surface of the separation plate and to become lower in the feed direction;
In a vertical feed sewing machine comprising: a control unit that controls a driving unit of each roller so that a side end portion of each sewing product is in a predetermined position based on a detection result of each detection unit;
The control means performs an operation control in which when the stepped portion of the upper workpiece to be sewn passes through the upper roller, the upper raising / lowering means repeatedly moves the upper roller in contact and separation. Up and down feed sewing machine. Comprising a first upper air blowing means for blowing air from the guide surface of the guide plate downward or downstream in the feed direction or in the combined direction thereof;
The said control means performs operation control which performs spraying by said 1st upper side air blowing means, when the step part of the sewing of the said upper side to-be-sewn material passes the said guide plate. The vertical feed sewing machine described in 1. Provided between the feed leg and the upper side detection means, and comprises a second upper side air blowing means for blowing air from above on the upper sewing product,
The said control means performs operation control which performs spraying by said 2nd upper side blowing means, when the step part of the sewing of said upper side sewing thing passes said upper side detection means. The vertical feed sewing machine according to 1 or 2. A retracting means for retracting the feed leg upward;
The said control means performs the operation control which performs the retraction | saving operation | movement by the said retraction means, when the step part of the sewing of the said upper side sewing thing passes the said feed leg. The vertical feed sewing machine according to any one of the above. Wherein, when the stepped portion of stitching of the lower workpiece passes through the lower roller, the operation control to repeat perform the contact and separation movement of the lower rollers by the lower lifting means The vertical feed sewing machine according to claim 1, wherein the vertical feed sewing machine is performed. A lower blowing means for blowing air toward the upper side or the feeding direction or the direction of combining these at the upstream side in the feeding direction of the lower roller;
The said control means performs operation control which performs the spraying by the said lower side blowing means, when the step part of the sewing of the said lower side sewing material passes the said lower roller. To 5. The vertical feed sewing machine according to any one of items 5 to 5.   7. The control unit according to claim 1, wherein the control unit counts the number of stitches, determines the passage of the sewing product through a stepped portion of the sewing based on the counted number of stitches, and executes operation control. The vertical feed sewing machine according to any one of the above. A step detection means for detecting a step formed on the upper sewing product or the lower sewing product,
7. The control unit according to claim 1, wherein the control unit determines the passage of the sewing step of the sewing product based on the step detection by the step detection unit, and executes operation control. The vertical feed sewing machine according to one item.

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