JPH0593623U - Hemming machine - Google Patents

Abstract

(57) [Summary] [Purpose] Make enough stroke of the forced return mechanism that operates when the upper die return spring of the hemming machine is damaged. [Structure] A lower die 11 on which a work W is placed, a preliminary bending blade bracket 23 that slides so as to approach the lower die 11 as it descends, and supports the preliminary bending blade 21, and the preliminary bending blade 21 is always upward. A spring 25 for urging, an upper die 11 that moves up and down and presses the preliminary bending blade 21 when descending, a cam 37 that is installed so as to project downward from the upper die 11, and a projecting downward from the preliminary bending blade bracket. Both the arm 7 for rotatably mounted around the auxiliary bending blade side forced return receiver 27 and the mounting shaft 73 as the center of rotation, and for locating each tip at the lowered position of the cam 37 and the preliminary bending blade side forced return receiver 27.
A hemming machine including an arm 72 having 4, 75.

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a hemming machine, and more specifically, a forced return for forcibly returning a preliminary bending blade bracket when a spring for returning the preliminary bending blade bracket to an initial raised position is damaged. A hemming machine having a mechanism.

[0002]

2. Description of the Related Art As a conventional hemming machine, a hemming machine shown in FIG. 8 is known. That is, 51 is an upper mold and 52 is a lower mold. The upper mold is moved up and down, and a cam 53 having a triangular shape in a side view is provided on the lower mold 52 side of the lower end. Contact surfaces 54 and 55 are provided on the upper side and the lower side of the cam 53, respectively. 56 is a spare curved blade. The spare curved blade 56 is attached to the work surface via a link 57. A roller 58 is attached above the upper link 57.

Therefore, when hemming is performed on the work set on the lower die 52, the upper die 51 is lowered. Then, the contact surface 55 of the cam 53 pushes the roller 58, lowers the preliminary curved blade 56 via the link 57, and brings the preliminary curved blade 56 closer to the lower die 52, so that the workpiece is hemmed. Further, when the upper die 51 is lowered, the contact between the cam 53 and the roller 58 is released, the roller 58 returns to the initial position, the preliminary curved blade 56 rises and separates from the lower die, and separates from the work. Further, the upper die is lowered, and the main bending blade located on the lower die is brought into contact with the work to perform the main bending work on the work. Then, the upper mold is lifted to complete the work.

However, when the spring that returns the preliminary bending blade bracket to the initial position, which is the raised position, is damaged, the preliminary bending blade bracket does not rise and does not return to the initial position. As a forced return mechanism for forcibly returning the preliminary bending blade bracket for that purpose, a mechanism including a forced return driver 59 and a forced return roller 61 shown in FIG. 9 is known.

In the forced return mechanism, the forced return roller 61 is attached coaxially with the roller 58, and the tip of the forced return driver 59 is attached to the upper die 51 so as to sandwich the 53 cam and the rollers 61 and 58. Therefore, when the spring that returns the preliminary bending blade bracket to the initial position in the ascending position is damaged, the tip of the forced return driver 59 contacts the left side of the forced return roller 61 and is guided by the taper surface, which is accompanied by the lowering of the upper die. As the forced return driver 59 descends, the forced return roller 61 is moved to the right in FIG. 9 in the direction of the arrow A to pull the preliminary bending blade 56 away from the main bending blade setting surface to prevent the preliminary bending blade from being damaged.

[0006]

In the conventional example shown in FIG. 9, the descending stroke of the forced return driver and the escape stroke of the forced return roller are almost the same at maximum due to the contact angle between the driver and the roller. I had a problem that I could only take strokes.

[0007]

[Means for Solving the Problems]

[0008] A lower die on which a work is placed, a preliminary bending blade bracket that supports a preliminary bending blade by sliding so as to approach the lower die as it descends, and a spring that constantly biases the preliminary bending blade bracket upward. An upper die that moves up and down and presses the preliminary bending blade when descending, a driver that projects downward from the upper die, and a preliminary bending blade side forced return receiver that projects downward from the preliminary bending blade bracket. And a arm having both arms that are mounted on a rotation centering on the mounting shaft as a rotation center and that have each tip positioned at the descending position of the driver and the preliminary bending blade side forced return receiver. Machine,

Providing

[0010]

[Operation] When the upper die is lowered, the upper die lowers the pre-bending blade in the direction of approaching the lower die. The pre-bending blade pre-bends the work and releases the upper die pressure. Then, the pre-bending blade is moved upward by the biasing force of the spring and away from the lower die.

When the spring is broken, the pre-bending blade is not already moved upward in the initial position direction by the biasing force of the spring. On the other hand, due to the lowering of the upper die, the driver and one arm located below the driver come into contact with each other and the arm is pushed down, so that the tip of the other arm rises in the opposite direction. Therefore, the preliminary bending blade side forced return receiver comes into contact with the other arm, and the preliminary bending blade is raised in the initial position direction.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A front view of a hemming machine according to an embodiment of the present invention is shown in FIG. 1, and a schematic front view of an operating state is sequentially shown in FIG. 2, FIG. 3, FIG. 4, and FIG.

Reference numeral 11 is a lower mold. A work placement portion 12 is provided on the upper surface of the lower die 11. A lower die fixing portion 13 is attached to the lower die 11 at a lower portion thereof, and the side surface of the work placement portion 12 is inclined with respect to a vertical line so that the side closer to the lower die 11 is lowered. Attach the side guide 14.

Reference numeral 21 is a preliminary bending blade. The tip of the pre-bending blade 21 forms a tapered working surface 22, and the other end of the working surface 22 is attached to the pre-bending blade bracket 23. A preliminary bending blade side guide 24 is attached to the lower end of the preliminary bending blade bracket 23 so as to be inclined with respect to the vertical line. The preliminary bending blade side guide 24 is slidably attached to the lower mold side guide 14. 25 is a spring. The spring 25 has a lower end attached to the lower die fixing portion 13 and an upper end attached to the preliminary bending blade side guide 24, and always biases the preliminary bending blade 21 upward. Reference numeral 26 denotes a roller, which is attached to the opposite end of the lower mold 11 of the preliminary bending blade bracket 23. Reference numeral 27 denotes a preliminary bending blade side forced return receiver, which is provided so as to project downward from the vicinity of the roller 26.

Reference numeral 31 is an upper die. A driver 37 having a cam 36 having a taper on the lower end is attached to the lower end of the upper die 31, and vertically moves above the position where the driver 37 contacts the roller 26. The cam 36 is rotatably attached by the rotating shaft 33, and the upward rotation is restricted by the stopper 34 so as not to rotate more than the horizontal state. The downward rotation of the cam 36 is not restricted. Reference numeral 35 denotes an escape portion, which is provided above the driver 37 so as to be retracted from the tip of the cam 32 to the side opposite to the lower mold 11. 37 is a driver. The driver 37 is installed on the side of the upper die 31 opposite to the auxiliary bending blade 21 in the vertical direction so that the tip of the driver 37 projects from the roller contact portion 36. The outside of the tip of the driver 37 is provided with a taper 38 that is sharper toward the tip than the pre-bending blade 21.

Reference numeral 41 is a main bending blade, and W is a work, which is installed on the work placement site.

Reference numeral 71 is an arm mounting bracket. The arm mounting bracket 71 is installed close to the lower mold 11. 72 is an arm. The arm 72 has a substantially V shape bent upward, and is attached to the arm mounting bracket 71 rotatably about an axis by an arm mounting shaft 73 at the bent portion. The arm 72 includes a long arm portion 74 having a long distance from the mounting shaft 73 to the tip, and a short arm portion 75 having a distance from the mounting shaft 73 to the tip that is shorter than the long arm portion 74. Rollers 76 are attached to the ends of the long arm portion 74 and the short arm portion 75, respectively.

Next, the operation of the embodiment will be described.

When the upper die 31 is lowered, the roller contact portion 36 of the cam 32 at the tip of the upper die 31 comes into contact with the roller 26, as shown in FIG. The cam 32, which is regulated by the stopper 34 and maintains a horizontal state, pushes down the roller 26. Then, the pre-bending blade bracket 23 resists the urging force of the spring 25 and moves downward according to the lower mold side guide 14 and the pre-bending blade side guide 24, and in the direction of approaching the lower mold 11 as a whole. Move. The pre-bending blade 21 contacts the work W to perform pre-bending, and the roller 26 attached to the pre-bending blade bracket 23 moves from the lower portion of the driver 32 so that they do not come into contact with each other (see FIG. 3). ..

However, in this state, the driver 37, the roller 76 attached to the short arm portion 75 to the short arm portion 75 front end, the preliminary bending blade side forced return receiver 27, the long arm portion 74 to the long arm portion 74 tip. Is not in contact with the roller 76 attached to.

The pre-bending blade bracket 23 is again guided by the pre-bending blade side guide 24 and the lower die side guide 14 by the urging force of the spring 25 to move upward and away from the lower die 11, and the roller 26 is moved. , Is housed in the escape portion 35 of the upper mold 31.

At this time, when the upper die 31 descends, the driver 37 comes into contact with the short arm portion 75 to the roller 76 attached to the tip of the short arm portion 75, and the short arm portion 75 is pressed down. Although the tip of 74 is raised in the opposite direction, the preliminary bending blade 21 has already moved upward in the initial position direction by the biasing force of the spring 25, so the preliminary bending blade side forced return receiver 27 and the long arm portion 74 to the long arm portion No contact is made with the roller 76 attached to the tip of the 74.

Next, the main bending blade 41 is lowered onto the work W to perform the main bending process.

After the main bending process is completed, the upper die 31 is lifted again. At this time, the cam 32 and the roller 26 come into contact with each other, but the cam 32 is rotatably attached by the rotating shaft 33, and the upward rotation is regulated by the stopper 34 so as not to rotate more than the horizontal state. Since the downward rotation is not restricted, the cam 32 escapes and the upper die 31 rises without moving the preliminary bending blade bracket 23, as shown in FIG. 5, to prepare for new machining.

Therefore, the preliminary bending blade 21 only comes into contact with the work W during the preliminary bending process, and does not come into contact with the work W again when the upper die is raised.

When the spring 25 is damaged, the pre-bending blade 21 is not already moved upward in the initial position direction by the urging force of the spring 25. On the other hand, as the upper die 31 descends, the driver 37 and the roller 76 attached to the short arm portion 75 to the short arm portion 75 are brought into contact with each other, and the short arm portion 75 is pressed down. On the contrary, it rises. Therefore, the preliminary bending blade side forced return receiver 27 contacts the long arm portion 74 to the roller 76 attached to the tip of the long arm portion 74, and the preliminary bending blade 21 is lifted in the initial position direction.

Since the taper 38 is provided on the side surface of the tip of the driver 37, the roller 76 attached to the tip of the short arm portion 75 is guided by the side surface of the driver 37 and the contact between the short arm portion 75 and the driver 37 beyond that. Avoid and hold.

[0028]

According to the present invention, in the case where the stroke of the driver attached to the upper mold is at least, the pre-bending blade returns to the initial position in the initial position, the return spring is damaged, or the return failure is caused by the settling. However, it is possible to take a sufficient stroke for forced movement.

[Brief description of drawings]

FIG. 1 is a front view of a hemming machine according to an embodiment of the present invention.

FIG. 2 is a schematic front view of an operating state of a hemming machine according to an embodiment of the present invention.

FIG. 3 is a schematic front view of an operating state of a hemming machine according to an embodiment of the present invention.

FIG. 4 is a schematic front view of an operating state of a hemming machine according to an embodiment of the present invention.

FIG. 5 is a schematic front view of an operating state of a hemming machine according to an embodiment of the present invention.

FIG. 6 is a schematic front view of an operating state of a hemming machine according to an embodiment of the present invention.

FIG. 7 is a schematic front view of an operating state of a hemming machine according to an embodiment of the present invention.

FIG. 8 is a front view of a conventional example.

FIG. 9 is a front view of a conventional example.

[Explanation of symbols]

 11 Lower Die 21 Preliminary Bending Blade 23 Preliminary Bending Blade Bracket 25 Spring 27 Preliminary Bending Blade Side Forced Return Receiver 31 Upper Die 36 Cam 37 Driver 72 Arm 74 Arm (Long Arm) 75 Arm (Short Arm)

Claims (1)

[Scope of utility model registration request] 1. A lower die on which a work is placed, a preliminary bending blade bracket that slides so as to approach the lower die as it descends, and supports the preliminary bending blade, and the preliminary bending blade bracket is always biased upward. A spring, an upper die that moves up and down and presses the preliminary bending blade when descending, a driver that is installed by projecting downward from the upper mold, and a preliminary bending blade side driver that projects downward from the preliminary bending blade bracket. , A hemming machine, which is rotatably mounted about a mounting shaft and has an arm having both arms for positioning each tip at a descending position of a driver and a preliminary bending blade side forced return receiver.