JPH0217563Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention allows sewing from double hem stitching to single hem stitching, or from single hem stitching to double hem stitching, in one touch on a welt sewing machine. This provides a simple device that can be easily switched.

"Conventional Technology" Conventionally, in this type of welt sewing machine, when changing the sewing from double welt sewing to single heel sewing, a spacer for switching between double heel and single welt hem is attached to the intermediate arm. The spacer was switched between the left and right arms by loosening a set screw or the like and moving the spacer each time.

``Problem that the invention aims to solve'' As mentioned above, the operator needs to move the spacer from both hems to one heel, and from one hem to both hems, by loosening the set screws, etc. each time he sews. Moreover, a large amount of time is spent on the switching operation, resulting in a huge loss from both an efficiency and economic point of view.

The purpose of the present invention is to eliminate the waste of preparation time and effort required for the above-mentioned switching operations.

"Means for Solving the Problem" In order to achieve the above-mentioned purpose, the present invention uses an air cylinder or a solenoid to switch the T-shaped ruler through a switch, and thereby switches the T-shaped ruler.
By turning ON and OFF and automatically moving the horizontal position of the fabric clamp, the sewing machine can easily and automatically switch between double heel sewing and single heel hem sewing.

``Embodiments and Effects'' Now, an example of the implementation of the present invention will be described in detail with reference to the accompanying drawings.

1 is the left fabric clamp, 2 is the right fabric clamp,
Both parties work together to hold down the dough. Reference numeral 3 denotes an air cylinder, which is a driving source that operates a switching valve 15 by the action of a switch 16, and moves the fabric clamp device 22 for double welt sewing or single heel sewing to the right or left. 4 is an air cylinder mounting plate, and 5 and 6 are left and right positioning plates, respectively, which roughly determine the left and right positions of the fabric clamps 1 and 2. 7
is a positioning stopper, which serves to finely adjust the left and right positions of the fabric clamps 1 and 2. 8 is the left positioning plate set screw, 9 is the right positioning plate set screw,
10 is the left intermediate arm, and the left dough clamp 1 is attached to the tip.
is installed. Reference numeral 11 denotes a right intermediate arm, and a right fabric clamp 2 is attached to the tip thereof, and the base ends of the left intermediate arm 10 and the right intermediate arm 11 are fixed to the base arm (not shown). 12 is T
A type ruler mounting stand with 1 T-shaped ruler fixing screw on one side.
3. Guide pins 14, 14 are attached, and T
Guide pin insertion grooves 19 provided in the type rulers 17, 20 are inserted, and the T-shaped rulers 17, 20 are fixed. 13 is a T-shaped ruler fixing screw, and T-shaped ruler 1
Fix 7,20. A guide pin 14 is loosely fitted into the guide pin insertion groove 19 of the T-shaped rulers 17 and 20. 15 is a switching valve, and T-type ruler mounting stand 12
It is attached to the other end and serves to move the fabric clamping device 22 to the left or right by the action of the switch 16. 16 is a switch, which includes T-shaped rulers 17, cutout portions 18 of 20, and a switch contact portion 21.
The changeover valve 15 is instructed to operate depending on whether it is in contact or not. Now, let's assume that the T-shaped ruler 17 is attached to the T-shaped ruler mounting base 1.
Suppose that it is fixed at 2. Then, since the T-shaped ruler 17 has a notch 18 and does not come into contact with the switch 16, the fabric clamping device 22 is fixed at a distributed position centered on the needle drop 23, and becomes the double welt sewing work position. Next, attach the T-shaped ruler 20 to the T-shaped ruler mounting base 1.
Suppose that it is fixed at 2. Then, the T-shaped ruler 20 has a switch contact part 21 that contacts the switch 16,
The changeover valve 15 operates in response to a command from the switch 16, and the air B, that is, the air for moving to the right, is switched from air A to the air B for moving to the left, and the fabric clamping device 22 moves to the left with the needle bar as the center. The position is changed to the edge sewing work position. 17 is a T-shaped ruler for both bead edges, which determines the bead width of the pocket; 18 is a notch; 19 is a guide pin insertion groove;
It serves as an auxiliary positioner for fixing 20. 2
0 is a T-shaped ruler for one heel edge, which determines the width of the pocket bead, 21 is a switch contact part, 22 is a fabric clamping device, and 23 is a needle drop, which is the position for forming a seam. A is an air pipe for moving the fabric clamping device to the left, B is an air pipe for moving the fabric clamping device to the right, and C is an air source pipe.

``Effects of the invention'' This invention has the above-mentioned structure and function, and has a very simple structure, so it does not require a large amount of equipment cost, is low cost, and uses an air cylinder to operate the switch. By changing the T-shaped ruler through the switch, the switch is turned ON and OFF to automatically move the fabric clamping device to the left or right, and this action allows the sewing process to be changed from double-welded hem sewing to single-welded hem sewing. It can be easily performed without requiring much time, and is very effective as it enables highly efficient sewing work.

Although an air cylinder is used as an embodiment of the present invention, an electric solenoid or the like may be substituted if necessary.

[Brief explanation of the drawing]

The attached drawings show an example of the implementation of the present invention.
The figure is a perspective view of a welt sewing machine that includes this device, Figure 2 is a perspective view of the fabric clamping device, Figure 3 is a perspective view with a T-shaped ruler for sewing double welts, and Figure 4 is a perspective view of a single heel sewing machine. A perspective view of the sewing T-shaped ruler attached, Figure 5 is a front view showing the T-shaped ruler for one welt not in contact with the switch, and Figure 6 shows the T-shaped ruler for both welts in contact with the switch. FIG. 1...Left dough clamp, 2...Right dough clamp, 3...Air cylinder, 4...Cylinder mounting base, 5...Left positioning plate, 6...Right positioning plate,
7...Positioning stopper, 8...Left positioning plate set screw, 9...Right positioning plate set screw, 10...
...Left intermediate arm, 11...Right intermediate arm, 12...
...T-shaped ruler mounting stand, 13...T-shaped ruler fixing screw,
14...Guide pin, 15...Switching valve, 16
...Switch, 17...T-shaped ruler for both bead edges, 18
...Notch, 19...Guide pin insertion groove, 20...
...T-shaped ruler for one bead, 21...Switch contact part,
22... Fabric clamp device, 23... Needle drop, 2
4... Throat plate, 25... Needle, 26... Sewing machine arm section, 27... Sewing machine bed section, A... Air pipe for moving the fabric clamping device to the left, B... Air pipe for moving the fabric clamping device to the right, C... Air source pipe.

Claims (1)

[Scope of utility model registration request] In the welt sewing machine, when switching work between double welt sewing and single welt sewing, the notch 18 is brought into contact with one of the T-shaped ruler 17 for double welts and the T-shaped ruler 20 for single welt edge, and the switch is brought into contact with the other. 21, a switching valve 15 that is activated by contact or non-contact of the switch contact part, and an air cylinder 3 or solenoid that moves the fabric clamping device by the operation of the switching valve, A welt edge sewing conversion device is characterized in that it is possible to switch between double heel edge sewing and single heel edge sewing with a single touch.