JPS6235533Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a workpiece angle conversion device in a press machine.

Conventionally, press machines have multiple stages of stations and are configured to automatically transfer workpieces one after another to the downstream station using a clamp mechanism attached to a transfer bar. There was no device to convert and set the angle of the workpiece (angle with respect to the vertical line) when transferring it to the workpiece, and therefore the workpiece angle conversion had to be done manually, which did not improve work efficiency and increased the risk of danger. There were some problems, such as:

Therefore, in such a press machine, when transferring the workpiece to the next station, the workpiece is guided by a guide groove fixed to the bar and a guide groove provided to the feed bar so that the workpiece is automatically rotated by a certain angle. A clamp is pivotally supported on the feed bar, and a converting section consisting of a rack and pinion is permanently connected to the lever and converts the swing motion of the lever into rotational motion. A workpiece angle converting device has been proposed that is configured to convert movement in advance and return directions into rotation of a clamp (see, for example, Japanese Utility Model Application Publication No. 154633/1983).

However, in a workpiece angle converting device with such a configuration, the rotation angle of the clamp is affected by the influence of gaps and bumps between the components from the guide groove to the clamp, such as between the guide groove and the lever, and between the rack and pinion. Fluctuations occur. In addition, there is a risk that the relative position between the two moving bodies, the feed bar and the bar, may be misaligned, and as a result, the displacement of the rotation angle of the clamp is unreliable, and there is a problem that the angle changes each time. .

In addition, since the rotation start position of the clamp is determined by the shape of the guide groove, it is difficult to change the timing of the rotation start position between stations. The problem was that it took a lot of time to respond.

In view of the above, this idea automatically changes the angle of the workpiece to enable it to be set at the downstream station, performs accurate and stable angle conversion, and allows the rotation start position of the workpiece to be easily changed. An object of the present invention is to provide an angle conversion device configured.

The gist of this invention is that the transfer bar of the press, together with the action of the clamp attached to it, grips the workpiece, lifts it up, transfers it to the downstream station, lowers it, sets it on the die, and releases the workpiece. , to return to the upstream station,
The transfer bar moves forward, raises, transfers,
Through a circular process of descending and returning,
The first and second shafts, which are pivotally supported by a transfer bar and have a clamp mechanism attached to their front ends, are fixed at an angle by an interlocking mechanism having a reversible biasing mechanism, and a first fixed arm and a second fixed arm that act on this mechanism. It is configured to convert.

The structure of this invention will be explained below based on the illustrated embodiment. 1 to 3, the transfer bar 1 moves forward a predetermined distance while maintaining the height shown in FIG. It moves a predetermined distance equal to the station interval of the press in the direction, and when it finishes moving, it descends by the height it previously rose, and when it descends, it retreats by the distance it previously moved forward, and from the retreated position it moves to the right. It is configured to be driven by a drive mechanism (not shown) so as to return to the initial starting point. 2 is a bracket body fixed to the transfer bar, and the bracket body 2 includes a first shaft 3 disposed in the front-rear direction;
A second shaft 4 arranged parallel to the first shaft 3 on the left side thereof
A first clamp mechanism 5 and a second clamp mechanism 6 are respectively attached to the rear ends of the first shaft 3 and the second shaft 4, and these clamp mechanisms control the forward movement of the transfer bar 1. The press grips the workpiece on the press die at the end point, releases the gripped workpiece at the start point of the backward stroke, and supplies the workpiece onto the die at the downstream station. A first lever 7 is fixed to the front end of the first shaft.
The lever 7 is in the form of a bell crank, and has a dogleg-shaped position as shown in Figure 1 and rotates 90° clockwise from that position.
A pin 12 and a pin 13 are implanted in the bracket body 2 so as to rotate between angularly displaced positions, and a tension coil spring 9 is attached to the pin 8 implanted in the upper end of the dogleg shape. The other end of the coil spring 9 is connected to a pin 10 implanted in the bracket body 2 on the left side of the first shaft 3, and the first lever 7 is biased counterclockwise in FIG. ing.
At this time, one side of the first lever 7 comes into contact with the pin 12 to define a first angular attitude. However, when the first lever 7 is rotated clockwise and the pin 8 crosses the straight line connecting the pin 10 and the axis of the first shaft 3 (passes the dead center), the coil spring 9 causes the first lever 7 to rotate clockwise. (The other side of the first lever 7 comes into contact with the pin 13, and the second angular attitude is defined.) A reversible biasing mechanism 11 is formed here as shown in FIG. A notch 7a is formed in the first lever 7 from the lower end of the dogleg shape toward the base, and a roller 15 pivotally supported at the upper end of the first drive lever 14 is rotatably fitted into this notch 7a. The first drive lever 14 is pivotally attached to the bracket body 2 below the first shaft 3, and has a leftward protrusion 14a formed at its lower end. A second lever 16 is fixed to the front end of the second shaft 4, and a roller 15 rotatably supported by the upper end of the second drive lever 17 is rotatably fitted into the notch 16a of the second lever 16. The second drive lever 17 is pivoted to the bracket main body below the second shaft 4 at the same height as the pivot point of the first drive lever 14, and has a protrusion 17a formed at its lower end. Reference numeral 19 denotes a link which is pivotally connected to the first drive lever 14 and the second drive lever 17 at a position below their respective pivot joints.
Or when the second drive lever 17 is rotated,
An interlocking mechanism 22 is formed so that the first lever 7 and the second lever 16 are both angularly displaced by 90 degrees, and the interlocking mechanism 22 is formed so that the first lever 7 has a dogleg shape.
The first lever 7 is angularly displaced between the angular position and the second angular position in which the first lever 7 is rotated 90 degrees clockwise from this position.

20 is a first fixed arm, the base 20 of which
a is fixed to the machine base, and is located between a predetermined distance and the protrusion 14a of the first drive lever 14 when the transfer bar 1 is in the forward position corresponding to the station of the press and the interlocking mechanism 22 is in the first angular position. They are placed at opposing positions, and their heights are defined as follows. That is, when the transfer bar 1 moves to the transfer stroke after the upward stroke, the protrusion 14a comes into contact with the right side surface of the first fixed arm 20, and as the transfer stroke progresses, the first drive lever 14 moves counterclockwise. With this rotation, the first lever 7 rotates, but as mentioned above, a biasing force in the opposite direction acts from the middle of this rotation, causing the first lever 7 to reversely move to the first drive. The necessary minimum height is such that the lever 14 is rotated to displace the interlocking mechanism 22 to the second angular position, and the second angular position is moved to the first angular position.
The height should be such that the drive lever 14 can exceed it. The second fixed arm 21 is also fixed to the machine base, and its position is such that the transfer bar 1 is lowered at a position corresponding to the downstream station and further retreated, and the interlocking mechanism 22 is in the second angular position. , the protruding portion 17a of the second drive lever is defined to face the left side surface of the second fixed arm 21 with a predetermined distance, and the height of the second fixed arm 21 is set to The drive lever 17 is pushed by the second fixed arm 21 and rotates clockwise, and the interlocking mechanism 22
Angular displacement is made from the angular position to the first angular position, and the second drive lever 17 is defined so as to be able to move over the second fixed arm 21 . Note that the front surface of the first fixed arm 20 is formed to be located further rear than the rear surface of the first drive lever 14 during the return stroke. Further, by changing the fixing positions of the first fixed arm 20 and the second fixed arm 21 to the machine base, the rotation start position of the workpiece can be changed. Note that 18 is a sub-bracket fixed to the bracket main body 2.

Next, in FIG. 4 showing the stroke of the transfer bar 1, the effect of this invention is shown at the end point A of the forward stroke f starting from the starting point S, the end point B of the upward stroke u,
Midway point C of transfer process t and end point D of transfer process t
, the end point E of the backward stroke b after the downward stroke d, and the midway point F of the return stroke r will be explained. FIG. 5A shows the state at point A, where the interlocking mechanism 22 is in the first angular posture, and in this posture, the first clamping mechanism 5 and the second clamping mechanism 6 respectively grip the workpieces R and L in a horizontal posture. . FIG. 5B shows the state at point B, at which time the protruding portion 14a of the first drive lever faces a position a predetermined distance below the upper end of the first fixed arm 20. Figure 5C shows the state at point C, and the first
After the protrusion 14a of the drive lever 14 comes into contact with the first fixed arm 20, the first drive lever 14 rotates counterclockwise, and the interlocking mechanism 22 assumes the second angular position by the action of the reversible biasing mechanism 11. It is angularly displaced and biased into that position. At this time, the first shaft 3 and the second shaft 4 are rotated 90 degrees clockwise, and the works R and L are placed in a vertical position. Figure 5D shows the state at point D, at which time the workpieces R and L are directly above the die of the downstream station, but at the end point of the downward stroke d, the workpieces R and L
is set in the die, and simultaneously with the start of the backward stroke b, the first clamp mechanism 5 and the second crank mechanism 6 release the works R and L, respectively. FIG. 5E shows the state at point E, where the protrusion 17a of the second drive lever 17 faces the left side surface of the second fixed arm 21 and assumes a position a predetermined distance below the upper end of this side surface. FIG. 5F shows the state at point F, where the second drive lever 17 has a protrusion 17a that is connected to the second fixed arm 2.
1 and rotates clockwise after contacting the reversible biasing mechanism 11.
As a result of the operation, the interlocking mechanism 22 is angularly displaced to the first angular position, and the first clamp mechanism 5 and the second clamp mechanism 6 return to their initial horizontal positions. Then, the second drive lever 17 passes over the second fixed arm 21, the transfer bar 1 returns to the starting point S, and the above-described operation is repeated thereafter. Note that the chain line in FIG. 3 indicates the interlocking mechanism at point S.

As mentioned above, in this invention, in the transfer stroke of the transfer bar 1, the first drive lever 14 and the first
By cooperating with the fixed arm 20, the reversible biasing mechanism 1
1 to rotate the clamp mechanism, and in the return stroke, the second drive lever 17 and second fixed arm 21 work together to activate the reversible biasing mechanism 11 to rotate the clamp mechanism in the direction of the return posture. Therefore, in the first and second angular postures, the clamp is self-locked by the reversible biasing mechanism to define the angle, and in the first and second angular postures, the clamp engages with the interlocking mechanism and the first and second angular postures. 2. Because the fixed arm is separated, the rotation angle of the clamp can be accurately and stably maintained regardless of the relative position of the transfer bar and the machine base, and without being affected by gaps or bumps between parts. be able to.
In addition, the rotation start position of the clamp can be set by the fixing positions of the first and second fixing arms to the machine base, so even if the mold structure or workpiece shape is different,
The setting of the turning position of the workpiece can be easily changed and adjusted accordingly. Furthermore, the manual work required to change the angular posture of the workpiece is omitted, which improves efficiency, which not only saves labor but also improves safety.

In addition, in this invention, the connection between the first lever and the first drive lever and the connection between the second lever and the second drive lever can be made into a gear mechanism, and the connection between the first angular position and the second angular position can be made into a gear mechanism. The angular displacement is the pin 12,1
By changing the planting position of No. 3, the angle can be easily changed to a desired angle. Furthermore, it is possible to eliminate one of the two clamp mechanisms, or to provide another axis linked to the first axis, second axis, etc., and attach a clamp mechanism to its rear end to convert the angle of three or more workpieces. It can be configured as follows.

[Brief explanation of drawings]

The figures show an embodiment of this invention, with Fig. 1 being a front view, Fig. 2 being a plan view, and Fig. 3 being a partially sectional side view.
FIG. 4 is a three-dimensional diagram showing the circulation stroke of the transfer bar, and FIGS. 5A to 5F are action explanatory diagrams. 1... Transfer bar, 2... Bracket body, 3... First axis, 4... Second axis, 5, 6...
Clamp mechanism, 7... First lever, 11... Reversible biasing mechanism, 14... First drive lever, 16... Second lever, 17... Second drive lever, 20... First fixed arm, 21 ...Second fixed arm, 22...
...Interlocking mechanism.

Claims (1)

[Scope of utility model registration request] The transfer bar of the press is formed to cycle through a forward stroke, an upward stroke, a transfer stroke to the downstream station, a downward stroke, a backward stroke, and a return process to the upstream station in this order, and is fixed to the transfer bar. A first shaft is pivotally supported in the bracket body facing in the front-rear direction, a second shaft is pivotally supported in parallel to the first shaft in the direction of the downstream station with respect to the first shaft, and at least one clamp mechanism is provided. The first shaft is attached to the rear end of the second shaft, and a first lever and a second lever are fixed to the front ends of the first shaft and the second shaft, respectively.
The first drive lever and the second drive lever are located below the lever, respectively.
A drive lever is pivotally attached to the bracket body, the first lever and the first drive lever are connected to each other so as to rotate in opposite directions, and the first lever and the second drive lever are connected so as to rotate in opposite directions. The drive lever is connected by a link so as to rotate in the same direction, and includes a first lever, a second lever, a first drive lever,
The second drive lever and the link form an interlocking mechanism, the interlocking mechanism is formed to be angularly displaceable between a first angular posture and a second angular posture, and the interlocking mechanism
It is equipped with a reversible biasing mechanism capable of biasing in both the angular position and the second angular position, and the first fixed arm fixed to the machine base contacts the first drive lever during the transfer stroke in the first angular position. The second fixed arm fixed to the machine base contacts the second drive lever during the return stroke in the second angular attitude and drives it to the first angular attitude. 1. An angle conversion device for a workpiece in a press machine, characterized in that it is formed to be displaced.