JP2008168314A - Press transfer device - Google Patents

Abstract

The present invention provides a press transfer device that can be conveyed quickly and reliably.
A crank mechanism coupled to a rear end side of a pair of superimposed feed bars and a clamp bar, and a pair of servo motors for controlling the rotation angle of the crank mechanism are provided, and a workpiece is gripped to each die. A plurality of transported clamp hands H1 to H3 are connected to the clamp bar at regular intervals, and the gripping claws extending from the clamp bar to one side and the opening and closing operation of the gripping claws accommodated in the housing on the upper surface of the clamp bar are extended. A claw opening / closing mechanism that performs forward / backward movement in the exit direction, an operating shaft DS that engages with this claw opening / closing mechanism and extends to the outside of the housing perpendicular to the conveying direction of the clamp bar, and offset to the other side of the clamp bar Actuation in which the reciprocating linear movement of the feed bar and the clamp bar is moved forward and backward by the conversion mechanisms 14a and 14b with respect to the operation shaft DS connected to the operation frame 24 provided in parallel And a frame 24.
[Selection] Figure 2

Description

  The present invention relates to a press transfer apparatus that sequentially transports a plurality of supply workpieces onto a die of a press machine using a pair of transfer bars arranged side by side.

  As a press transfer device in the prior art, a pair of transfer bars are arranged in parallel on the base so that the front end faces the inside of the press machine die so as to be vertically reciprocated by a drive mechanism provided on the rear end side. An apparatus is known that is installed and guided and supports a plurality of supply workpieces sequentially on a die of a press machine (see Patent Document 1).

  The pair of transfer bars includes a pair of clamp bars arranged in parallel at a predetermined interval and a pair of feed bars superimposed on the upper surface of the clamp bar, and a clamp mechanism is provided at the front end side of the transfer bar. Is provided.

  In this clamping mechanism, clamping claws protruding inward to grip a plurality of supply workpieces simultaneously between a pair of frames arranged in parallel in the vicinity of both outer side surfaces of the transfer bar face each other at predetermined intervals. These clamp claws are slidably fitted in the lateral grooves formed on the upper surfaces of the pair of feed bars.

  A pair of left and right inclined grooves that are inclined at a predetermined inclination angle in plan view with respect to the straight traveling direction are symmetrically formed at front and rear portions of the upper surfaces of the pair of clamp bars and are supported on the upper surfaces of the clamp bars. The laterally elongated grooves are formed so as to overlap with the inclined grooves.

  In addition, a pair of operating pieces with operating pins perpendicular to the upper and lower surfaces project inward on the front and rear of both frames, and the lower operating pins fit into the inclined grooves on the clamp bar. In addition, the operation pins on the upper surface are configured to be fitted in the laterally long grooves of the feed bar.

  Therefore, the relative movement of the clamp bar and the feed bar causes the pair of frames to approach and separate in the width direction via the upper and lower operation pins fitted in the laterally long and inclined grooves of the clamp mechanism. Thus, the plurality of opposing clamp claws can be opened and closed.

  Further, the drive mechanism of the transfer bar uses a driving force of a press machine to swing the feed lever and the clamp lever to linearly move the feed bar and the clamp bar. The clamp bar has an extra movement distance relative to the linear movement distance of the pair of feed bars, and the clamping or unclamping operation is performed by the clamp claws by the extra movement distance.

  As described above, the above-described press transfer device grips a plurality of supply workpieces at the same time with clamp claws by the synchronous and relative reciprocating linear movement of a pair of feed bars and clamp bars, and presses them on the press machine die. Are transported sequentially.

Japanese Patent No. 3783161

  By the way, the transfer line that automatically conveys the workpiece to be processed to a plurality of press machines consists of a transfer press line in which portal type press machines are continuously arranged according to the type of press machine and a C type structure press machine. A tandem press line is used.

  In the above-mentioned press transfer device, there is a wide transfer device using clamp claws that are opposed to each other inward from a pair of transfer bars that are arranged in parallel with a predetermined distance apart between clamp claws that simultaneously grip a plurality of supply workpieces. It is suitable for use as a transfer press line because it is used, but it is difficult to transport with a wide transfer device to put it into a tandem press line with a press machine with shallow C-type structure of Futokoro. Therefore, there has been a demand for an improved press transfer device that can be introduced into both press lines.

  Therefore, the applicant pays attention to the fact that the width of the conveying line can be narrowed into both press lines, so that both sides in the conveying direction are provided by a pair of transfer bars arranged in parallel at a predetermined interval as in the prior art. It is found that the transfer bar can be unified by arranging the clamp claws arranged opposite from the inside toward the inner side toward the mold side of the press machine as a cantilever structure. developed.

  The present invention has been made paying attention to the above points, and by extending a hand equipped with gripping claws from the side surface of the transfer bar, the range of application to press machines of various structures is expanded, and the electric motor It is an object of the present invention to provide a press transfer device that can quickly and surely convey at a timing that matches the press working tact corresponding to the type of workpiece to be supplied by control.

In order to achieve the above object, a press transfer apparatus according to claim 1 of the present invention sequentially transfers a plurality of supply workpieces W onto dies K1, K2, and K3 of a press machine M using a transfer bar. In the press transfer device, the transfer bar TB is composed of a pair of feed bar FB and clamp bar CB which are superposed vertically so as to be linearly reciprocated by the drive mechanism D and guided and supported on the base 22. The drive mechanism D has a pair of crank mechanisms 4a connected to the rear end side in the conveying direction of the pair of feed bars FB and clamp bars CB extending so that the front end faces the inside of the molds K1, K2, and K3. , 4b and a pair of electric motors M1, M2 for controlling the rotation angles of the crank mechanisms 4a, 4b by a control device, the clamp bar CB A plurality of clamp hands H1, H2, and H3 that hold the plurality of supply workpieces W and convey them simultaneously corresponding to the molds K1, K2, and K3 of the press machine M are provided at regular intervals on the front side. The clamp hands H1, H2, and H3 are attached to the upper surface of the clamp bar CB and a pair of grip claws J that extend from the clamp bar CB to one side perpendicular to the conveying direction and grip the supply workpiece W. A claw opening / closing mechanism 30 that is housed in a housing 28 and that continuously opens and closes the gripping claw J and moves the gripping claw J forward and backward in the extending direction; A front end that engages with the claw opening / closing mechanism 30 and a rear end thereof that extends from the housing 28 toward the other side perpendicular to the conveying direction of the clamp bar CB; Of the feed bar CB and the clamp bar CB obtained by offsetting the rotation angle of the crank mechanisms 4a and 4b. An operation frame 24 that moves the operation shaft DS back and forth through conversion mechanisms 14a and 14b that convert a relative reciprocating linear movement into a lateral movement orthogonal to the transport direction. The plurality of supply workpieces W are simultaneously conveyed in the press working tact on the molds K1, K2, and K3 of the press machine M in the order of processes by the interaction of the synchronous and relative reciprocating linear movement of the clamp bar CB. This is a press transfer device.
According to the press transfer device, when the crank mechanisms 4a and 4b are rotationally driven by the activation of the pair of electric motors M1 and M2, the crank mechanisms 4a and 4b are controlled by the rotation control of the pair of electric motors M1 and M2. A pair of feed bar FB and clamp bar CB which are superimposed on each other via a straight line are synchronously and relatively linearly reciprocated, and the relative reciprocating linear movement is operated via conversion mechanisms 14a and 14b. A claw opening / closing mechanism 30 that gives the frame 24 a reciprocating motion in a transverse direction perpendicular to the conveying direction and engages the tip of the claw opening / closing mechanism 30 by the operating shaft DS connected to the operating frame 24 moves back and forth in the housing 28. The opening / closing mechanism 30 moves relative to the operating shaft DS in the vicinity of the front and rear moving ends of the gripping claws J attached to the pair of clamp hands H1, H2, and H3. The gripping claws J are opened and closed horizontally, and the plurality of workpieces W are simultaneously moved in the press working tact on each die of the press machine M by the synchronous reciprocation of the pair of feed bars FB and clamp bars CB. It is conveyed in process order.

The press transfer device according to claim 2 of the present invention is characterized in that the claw opening / closing mechanism 30 is supported in the housing 28 so as to be able to move straight forward and backward, and the operating shaft facing the moving casing 26. A pair of guides that are rotatably supported on the inner bottom surface of the movable casing 26 at symmetrical positions on both sides of the operating shaft DS behind the opening / closing cam follower 34 and rotatably supported by the front end of the DS. A pair of spring accommodating cases 32a, 32b, which are held in a state of being extended from the side surface of the operating frame 24 so that the front end faces the inside of the housing 28, and both the spring accommodating cases 32a, A pair of springs SP housed in 32b for pressing and urging the movable casing 26 forward, and flat plates overlapping each other. The open / close cam follower 34 is inserted and fitted into the intersecting portion of the inclined elongated holes 40a, 40b accommodated in the movable casing 26 and formed symmetrically on the front sides of the two flat plates, and the inclined elongated holes 40a. The pair of guide cam followers 36a and 36b are respectively inserted and fitted into horizontally elongated holes 42a and 42b formed so that the end portions are opened at both ends of each flat plate behind 40b. A pair of claw opening / closing plates 38a, 38b and both end portions spaced forward from the opposite end portions of the both claw opening / closing plates 38a, 38b and extending forward are attached inward by the action of the spring SP1. A pair of gripping arms R1 and R2 that are biased, and a pair of gripping claws J that are detachably attached to the tips of the gripping arms R1 and R2 and horizontally grip both side surfaces of the supply workpiece W; A pressing transfer device characterized in that it is al configuration.
According to the press transfer device, the claw opening / closing mechanism 30 moves forward / backward in the housing 28 via the operating shaft DS by the reciprocating motion of the operating frame 24 in the lateral direction, and the forward / backward movement of the claw opening / closing mechanism 30 is gripped. When the claw J is stopped in the vicinity of the front and rear moving end, the claw opening / closing mechanism 30 and the opening / closing cam follower 34 are opened / closed by the symmetrical elongated long holes 40a, 40b in which the claw opening / closing mechanism 30 and the opening / closing cam follower 34 move relative to each other. And a pair of guide cam followers 36a and 36b are moved in synchronism with each other to move the pair of gripping arms R1 and R2 mounted with the gripping claws J forward and backward in the extending direction together with the operating shaft DS.

  In the press transfer device according to claim 3 of the present invention, the clamp hands H1, H2, and H3 have an operation frame in which a pair of gripping claws J in the retracted position are at a position farthest from the side surface of the transfer bar TB. 24 is held in the retracted position against the urging force of the spring SP by the operating shaft DS and is opened by the claw opening / closing mechanism 30 in the movable casing 26, and the gripping claw J in the opened state is Due to the relative linear movement of the bar FB and the clamp bar CB, the movable casing 26 is moved by the urging force of the spring SP cooperating with the operating shaft DS that moves forward and forward to one side of the clamp bar CB orthogonal to the conveying direction. After moving to the forward end, the gripping claw J moved to the forward end via the claw opening / closing mechanism 30 by the further forward movement of the operating shaft DS is Next, the gripping claws J that are gripping the supply workpiece W and gripping the supply workpiece W in the forward position are moved from the side surface of the transfer bar TB by the relative linear movement of the feed bar FB and the clamp bar CB. The claw opening / closing mechanism 30 is operated against the urging force of the two springs SP holding the movable casing 26 at the forward end by the backward movement of the operation shaft DS of the operation frame 24 at the closest position. The press transfer device is configured to open the pair of gripping arms R1 and R2 and to move to a retracted position by further retracting the operating shaft DS.

  The present invention has the following effects.

  According to the first aspect of the present invention, various structures can be obtained by arranging a plurality of clamp hands on one side orthogonal to the conveying direction from a transfer bar in which a pair of feed bars and clamp bars are vertically superimposed. The application range to a press machine is expanded, and the pair of feed bars and clamp bars are synchronously and relatively reciprocated linearly by a pair of crank mechanisms respectively connected to a pair of electric motors whose rotation angles are controlled. Therefore, it can be quickly and reliably transported at a timing that matches the press working tact corresponding to the type of workpiece to be supplied.

  According to the second aspect of the present invention, the claw opening / closing mechanism has an operating shaft that reciprocates in a direction orthogonal to the conveying direction only by a relative linear reciprocation of a pair of feed bar and clamp bar superimposed vertically. The gripping claws that move back and forth in synchronization with each other can be opened or closed at the moving end.

  According to the third aspect of the invention, since the biasing force of the spring is used for the opening / closing operation of the gripping claw at the reciprocating end, it acts when the power is transmitted from the operating shaft to the claw opening / closing mechanism and the gripping claw. An excessive load can be avoided.

Examples of the present invention will be described below.

  1 to 6 show an embodiment of the present invention. FIG. 1 is a partially enlarged plan view showing a drive mechanism of a press transfer apparatus according to the present invention, and FIG. 2 is a partially enlarged plan view of a transfer bar provided with a plurality of clamp hands on the front end side connected to the drive mechanism on the rear end side in the transport direction. Fig. 3 (a) is an enlarged plan view of part E of Fig. 2 showing a conversion mechanism for switching the operating shaft to a movement perpendicular to the conveying direction by reciprocating linear movement of the feed bar and clamp bar. AA sectional view, FIG. 4 is a plan view of a plurality of clamp hands arranged at regular intervals on the upper surface of the clamp bar, FIG. 5 is a partial plan view showing the relationship between the clamp hand and the conversion mechanism, and FIG. FIG. 5 is a sectional view taken along line BB in FIG. 5, and FIG. 5B is a sectional view taken along line CC in FIG.

  1 and 2, reference numeral 1 denotes a press transfer apparatus according to the present invention, and 2 denotes a drive mechanism for moving the transfer bar back and forth linearly back and forth in the transport direction. The press transfer device 1 intermittently and sequentially conveys the supply workpiece W onto a plurality of molds (not shown) of the press machine M by a transfer bar TB described later via a drive mechanism D using a pair of electric motors M1 and M2. It is like that.

  In the drive mechanism D, a pair of servo motors that control a rotation angle or the like by a control device (not shown) is used as a pair of electric motors M1 and M2 serving as drive sources, and the transfer bar TB has the same width. The steel bar is composed of a pair of a feed bar and a clamp bar that are formed in the shape of a long strip. The feed bar FB can be moved straight on the upper surface of the base 22 via a linear guide LM1 as shown in FIG. The clamp bar CB is supported on the upper surface of the feed bar FB so as to be linearly movable by the linear guide LM2, and the feed bar FB and the clamp bar CB are arranged at the rear ends of the FB and CB. It is guided and supported on the base by a drive mechanism D provided on the side, and the tip side extends toward a plurality of dies of the press machine M.

  Next, a description will be given of the drive mechanism D that gives the transfer bar TB a linear reciprocating movement.

  The drive mechanism D applies a linear reciprocating motion to the transfer bar TB and sequentially conveys the supply workpiece W gripped by a plurality of clamp hands, which will be described later, onto a plurality of dies K1, K2, K3 of the press machine M. Thus, the reciprocating linear movement operation synchronously and relative to the longitudinal direction of the feed bar FB and the clamp bar CB, which are vertically overlapped to form the transfer bar TB, is provided via a pair of crank mechanisms 4a and 4b. It has become.

  One crank mechanism 4a has a crank arm CR1 having one end mounted on the output shaft of the servo motor M1 and a cam follower 5a supported on the other end, and a lower surface in a direction perpendicular to the conveying direction so as to insert the cam follower 5a. The other end of the crank mechanism 4b is mounted on the output shaft of the servo motor M2 and is connected to the other end of the stay 6a. The stay 6a extends in the same direction from the side surface of the rear end of the clamp bar CB. A crank arm CR2 on which the cam follower 5b is pivotally supported, and a guide groove 8b in the direction perpendicular to the conveying direction are provided on the lower surface so that the cam follower 5b is inserted, and extends in the same direction from the side surface of the rear end of the feed bar FB. And the stay 6b.

  Three clamp hands H1, H2, H3 extending on one side in the conveying direction of the transfer bar TB are provided on a top surface on the tip side of the clamp bar CB superimposed on the upper surface of the feed bar FB. And the mold K1 and the interval L between the molds K1 to K3, and these three clamp hands H1, H2, H3 are adjacent to each other via a pair of conversion mechanisms 14a, 14b described later. Between the workpiece supply position N, the mold K1, the molds K1 and K2, and the molds K2 and K3, reciprocates by a predetermined distance L in the same direction as the transfer direction of the transfer bar TB and reciprocates in the front-rear direction perpendicular to the transport direction. Is configured to do.

As shown in FIGS. 2, 3 (a), and (b), the conversion mechanisms 14 a and 14 b include a pair of support arms 18 a and 18 b in a lateral groove G formed on the lower surface of the clamp bar CB in a direction perpendicular to the conveying direction. The cam followers 15a, 16a and 15b, 16b are coaxially supported on the upper and lower surfaces of the support arms 18a, 18b, respectively, and the cam followers 15a, 15b are pivotally supported on the upper surface. Are inserted into a pair of horizontally elongated holes 20a, 20b formed in a direction perpendicular to the conveying direction in the clamp bar CB, and cam followers 16a, 16b pivotally supported on the lower surface are oblique to the feed bar FB in the conveying direction. Are inserted into a pair of slanted long holes 21a, 21b formed in a direction intersecting with each other.

  An operation frame 24 is attached in parallel to the tip of the support arms 18a, 18b extending to the other side in the transport direction of the transfer bar TB in a state offset from the side surface of the clamp bar CB.

  A vertical frame 24a is attached to a side end of the operating frame 24 that approaches the clamp bar CB, and the tip of the operating shaft DS is spaced on the vertical frame 24a at intervals corresponding to the three clamp hands H1, H2, and H3. Is attached to the rear end side so as to extend toward the clamp bar CB.

  Next, the clamp hands H1, H2, and H3 will be described in detail with reference to FIGS. In this embodiment, a description will be given of the clamp hand H3 having the same configuration.

  As shown in FIG. 4, the three clamp hands H1, H2, and H3 are movable casings 26 that can move linearly back and forth in the same direction as the operating shaft DS in a housing 28 attached to the upper surface of the clamp bar at regular intervals L. A claw opening / closing mechanism 30 that horizontally opens and closes a pair of gripping arms R1 and R2 that are detachably mounted with gripping claws J that grip a workpiece W at the tip is housed in the movable casing 26. Yes.

  In the vertical frame 24a of the operating frame 24, a pair of spring housing cases 32a and 32b housing compression springs SP for pressing and urging the movable casing 26 forward on both sides of the operating shaft DS are disposed in the housing 28. It is inserted and held so that the tip faces.

The claw opening / closing mechanism 30 is located symmetrically on both sides of the opening / closing cam follower 34 rotatably supported at the tip of the operating shaft DS facing the moving casing 26 and the operating shaft DS behind the opening / closing cam follower 34. A pair of guide cam followers 36a and 36b that are rotatably supported on the inner bottom surface of the upper and lower ends, and a pair of upper and lower claw opening and closing plates 38a and 38b formed in a rectangular flat plate shape are accommodated in the movable casing 26. In addition, left and right symmetrical inclined long holes 40a and 40b are formed at the front center of the both claw opening and closing plates 38a and 38b, and the opening and closing cam follower 34 is inserted into a portion where the inclined long holes 40a and 40b overlap with each other. Match.

  Lateral long holes 42a and 42b whose side ends are opened are formed on both side ends of the claw opening and closing plates 38a and 38b behind the inclined long holes 40a and 40b, respectively. A pair of guide cam followers 36a and 36b, which are rotatably supported on the inner bottom surface, are respectively inserted and fitted.

  A pair of gripping arms R1 and R2 project forward from the opposite ends of the front and rear ends of the both claw opening and closing plates 38a and 38b, respectively. A pair of gripping claws J for horizontally gripping both side surfaces of W are detachably mounted, and the distal ends of both gripping arms R1 and R2 are urged inward by the action of the tension spring SP1.

  Next, the operation of the press transfer apparatus 1 will be described with reference to the timing diagrams of FIGS. 9 (a) and 9 (b).

  9A and 9B are timing diagrams of the press transfer device, wherein FIG. 9A is a timing diagram for each processing step by each mold in the press machine, and FIG. 9B is a timing diagram of the clamp bar and the feed bar.

  The transfer bar TB that linearly reciprocates between a plurality of dies of the press machine M has an initial position X shown in FIG. 9B. When the drive mechanism D is activated, the transfer bar TB is moved from this position. Forward movement (right feed) is started.

  The drive mechanism D shown in FIG. 1 shows a state in which the pair of upper and lower feed bars FB and the clamp bar CB constituting the transfer bar TB are at the forward end Y in the transport direction in FIG. Both gripping arms R1 and R2 that grip the arm are also in the forward end.

  As shown in FIG. 9B, a description will be given based on the drive mechanism shown in FIG. 1 when the transfer bar TB is started from the initial position X. First, when the servo motor M1 start command and the servo motor M2 stop command are output at the same time after temporarily stopping from the initial position, the crank arm CR1 rotates counterclockwise during the stop of the servo motor M2 and moves to the reverse position. The cam follower 5a at the position is swung from the P1 position to the P3 position.

  As a result, as shown in FIGS. 4 and 5, the clamp bar CB moves forward relative to the stopped feed bar FB in the right direction by the movement distance L1 (= 30 mm), whereby both the conversion mechanisms 14a and 14b are moved. The support arms 18a and 18b are respectively guided by cam followers 15a and 15b that are guided by a pair of laterally long holes 20a and 20b through cam followers 16a and 16b (see FIG. 3) inserted in the oblique long holes 21a and 21b, respectively. The operation frame 24 is moved forward in a direction orthogonal to the conveyance direction to a position where the operation frame 24 is closest to the side surface of the clamp bar CB.

  The movable casing 26 is a pair of gripping arms that remain open together with the claw opening / closing mechanism 30 by the biasing force of the compression spring SP in the pair of spring housing cases 32a and 32b that move forward together with the operating shaft DS by the moving action of the operating frame 24. R1 and R2 move forward, and come into contact with the front end inner wall 26a in the housing 28 to stop.

  Due to the further forward movement (= 7 mm) of the operation frame 24, the upper and lower claw opening / closing plates 38a, 38b are paired with a pair of upper and lower laterally via an opening / closing cam follower 34 at the tip of the operation shaft DS fitted into the inclined elongated holes 40a, 40b. The holes 42a and 42b are guided by the guide cam followers 36a and 36b to move inward.

  As a result, of the three clamp hands H1, H2, and H3 that move forward simultaneously, the grip claw J of the clamp hand H1 on the rear end side in the transport direction moves to the inside of the pair of grip arms R1 and R2 and the tension spring SP1. By this cooperative action, the supply workpiece W at the supply position can be reliably gripped.

  In this state, while the gripped supply workpiece W is being processed by each die by the press machine, the feed bar FB stopped from the initial position X as shown in FIG. In addition, the clamp bar CB, which has moved forward relative to hold the supply workpiece W and stopped for a certain period of time, causes the cam follower 5a of the crank arm CR1 to swing counterclockwise from the position P3 by the activation of the servo motor M1 shown in FIG. At the same time, the forward movement in the right direction is started, and at the same time, the cam follower 5b of the crank arm CR2 swings counterclockwise by the activation of the servo motor M2, so that the feed bar FB also starts to move in the right direction.

  Although the feed bar FB and the clamp bar CB are both moved forward by the simultaneous counterclockwise swinging motion of the crank arm CR1 and the crank arm CR2, the clamp bar has already moved in the transport direction by the moving distance L1 (= 30 mm). The CB moves to the Y position moved by the moving distance L + L1 (= 130 mm) with respect to the moving distance L (= 100 mm) of the feed bar FB and simultaneously stops.

  Next, the clamp bar CB in the stationary state shown in FIG. 9B is moved to the left via the cam follower 5a of the crank arm CR1 that is swung clockwise by the servo motor M1 that has been activated first with respect to the feed bar FB. Start relative backward movement.

  As a result, the operating shaft DS moves in a direction away from the clamp bar CB via both the conversion mechanisms 14a and 14b to move the operating frame 24 backward, and is biased and supported by the compression springs SP in the housing cases 32a and 32b. With respect to the claw opening / closing mechanism 30 in the movable casing 26, the gripping claws J at the tips of the gripping arms R1, R2 are opened by the first backward movement (= 7 mm) of the operating shaft DS, and both gripping arms remain open. In R1 and R2, the cam follower 5a of the crank arm CR1 returns to the P1 position when the clamp bar CB moves backward by a moving distance (= 30 mm).

  After that, the clamp bar CB which holds both the gripping arms R1 and R2 in the retracted position for a certain time is moved by the crank arms CR1 and CR2 which are simultaneously started by the servo motors M1 and M2 and swing counterclockwise. The feed bar FB and the clamp bar CB are synchronously moved in the left direction and returned to the initial position X.

  As described above, the clamp bar CB that has moved forward after the fixed stop from the initial position X is moved by the relative forward movement (= 30 mm) with respect to the feed bar FB via the conversion mechanisms 14a and 14b. Both grip arms R1 and R2 are moved forward to grip the workpiece W supplied at 7 mm immediately before the forward end by gripping claws J, and stopped until the press working by the mold is completed. The workpiece W is moved forward 100 mm to the right together with the clamp bar CB, and the supply workpiece W is transferred to a mold for performing the next process.

  The clamp bar CB, which has transferred the supply workpiece W to the mold for performing the next process by the simultaneous operation with the feed bar FB, is stopped until the press working is completed, and then is moved backward relative to the left (= 30 mm). Immediately after the gripping arms R1 and R2 are moved backward via the conversion mechanisms 14a and 14b, the gripping claws J are moved back to the retracted end by moving 7 mm.

  After stopping for a certain period of time, the feed bar FB and the clamp bar CB are simultaneously moved backward in the left direction to return to the initial position X, and both the gripping arms R1, R2 having the gripping claws J in the open state are in the retracted position. Return to the original position while waiting.

  The supply work W is repeatedly reciprocated in the conveying direction of both gripping arms R1 and R2 by the interaction of synchronous and relative reciprocating linear movement of the feed bar FB and the clamp bar CB by the rotation control of the servo motors M1 and M2. By the movement and the back-and-forth movement orthogonal to the transport direction converted by the pair of conversion mechanisms 14a and 14b, the feed position D can be sequentially fed into the molds K1, K2, and K3 in the order of steps.

  As described above, the press transfer device of the present invention is applied to press machines having various structures by arranging a plurality of clamp hands H1, H2, and H3 from the transfer bar TB on one side orthogonal to the transport direction. The pair of feed bars FB and the clamp bars CB are synchronously and relatively moved by a pair of crank mechanisms CR1 and CR2 respectively connected to a pair of servo motors M1 and M2 whose range of rotation is controlled and whose rotation angle is controlled. By reciprocating linear movement, it can be quickly and reliably conveyed at a timing that matches the press working tact corresponding to the type of the workpiece W to be supplied.

  The claw opening / closing mechanism 30 is moved back and forth in synchronism with the operating shaft DS that reciprocates in the direction perpendicular to the conveying direction only by the relative linear reciprocation of the pair of feed bars FB and clamp bars CB that are superposed vertically. An operation of opening or closing the gripping claws J at the tips of the pair of moving gripping arms R1 and R2 at the moving end can be performed.

  Further, since the biasing force of the compression spring SP is used for the opening / closing operation of the gripping claw J at the reciprocating end, it is excessive when acting on transmitting power from the operating shaft DS to the claw opening / closing mechanism 30 or the gripping claw J. A load can be avoided.

  Next, a modified example of the clamp hand will be described with reference to FIGS. 7 is a plan view of a clamp hand showing a modified example, FIG. 8A is a sectional view taken along the line DD in FIG. 7, and FIG. 7B is a sectional view taken along the line EE in FIG. Members having the same configurations as those shown in FIG. 5 and FIG.

  Oscillating arms 44a and 44b having gripping claws J attached to the tips are pivotally attached to the tips of a pair of gripping arms R3 and R4 constituting a modification of the clamp hand so that they can swing horizontally via a pivot 45. The swinging arms 44a and 44b have a pair of gripping claws J attached to the outside of the supply work W by a torsion spring SP2 whose central portion is inserted and supported by the pivot 45 and both ends are locked to pins 46 and 48. It is urged in a closing direction with a certain distance from the diameter at a distance at which a closing allowance is formed.

  As described above, the supply workpiece W at the supply position can be reliably gripped by the inward movement of the gripping arms R3 and R4 and the cooperative action of the torsion spring SP2 as in the tension spring SP1. The other actions and effects in this modification have the same actions and effects as those of the above embodiment, and the description thereof is omitted.

  In addition, although not particularly illustrated, instead of the torsion spring SP2, the pair of tension springs are stretched and locked in parallel to the inner sides facing the pair of gripping arms R3, R4 and the swinging arms 44a, 44b. The gripping claws J at the tips of the swinging arms 44a and 44b are urged inward via the pivot 45, and are attached in the direction of closing in a state of being spaced apart from the outer diameter of the supply work W by a fixed distance. The same function can be obtained by adopting a configuration that supports the above.

It is a partial enlarged plan view which shows the drive mechanism of the press transfer apparatus which concerns on one Embodiment of this invention. It is the elements on larger scale of the transfer bar which provided the some clamp hand in the front end side by which the conveyance direction rear end side was connected with the drive mechanism. 2A is an enlarged plan view of a portion E in FIG. 2 showing a conversion mechanism that switches the operation shaft to a movement orthogonal to the conveying direction by reciprocating linear movement of the feed bar and the clamp bar, and FIG. 2B is an AA cross section of FIG. FIG. It is a top view of a plurality of clamp hands arranged in a line at regular intervals on the upper surface of a clamp bar. It is a fragmentary top view which shows the relationship between a clamp hand and a conversion mechanism. (A) is BB sectional drawing of FIG. 5, (b) is CC sectional drawing of (a). It is a top view of the clamp hand which shows a modification. (A) is DD sectional drawing of FIG. 7, (b) is EE sectional drawing of (a). FIG. 4 is a timing diagram of the press transfer apparatus, where (a) is a timing diagram for each processing step by each mold in the press machine, and (b) is a timing diagram of a clamp bar and a feed bar.

Explanation of symbols

1 Press transfer device 4a, 4b Crank mechanism 5a, 5b Cam follower 6a, 6b Stay 8a, 8b Guide groove 14a, 14b Conversion mechanism 15a, 15b Cam follower 16a, 16b Cam follower 18a, 18b Support arm 20a, 20b Horizontal long hole 22 Base 24 Actuation Frame 24a Vertical frame 26 Moving casing 26a Front end inner wall 28 Housing 30 Claw opening / closing mechanism 32a, 32b Spring housing case 34 Opening / closing cam follower 36a, 36b Guide cam follower 38a, 38b Claw opening / closing plate 40a, 40b Inclined slot 42a, 42b Horizontal slot 44a, 44b Oscillating arm 45 Pivot axis 46, 48 Pin CB Clamp bar CR1, CR2 Crank arm D Drive mechanism DS Actuation axis FB Feed bar G Horizontal groove H1, H2, H3 Clamp hand J Grip claw K1, K2, K3 Die LM1, LM2 Linear guide N Work supply position M Press machine M1, M2 Servo motor (electric motor)
R1, R2 Grip arm R3, R4 Grip arm SP Compression spring SP1 Tension spring SP2 Torsion spring TB Transfer bar W Supply workpiece

Claims (3)

In a press transfer apparatus that sequentially transfers a plurality of supply workpieces W onto dies K1, K2, and K3 of a press machine M using a transfer bar.
The transfer bar TB includes a pair of a feed bar FB and a clamp bar CB that are superposed vertically so as to be linearly reciprocable by the drive mechanism D and guided and supported on the base 22. A pair of crank mechanisms 4a and 4b connected to the rear ends in the conveying direction of the pair of feed bars FB and the clamp bars CB extending so as to face the inside of the molds K1, K2, and K3, and a control device A pair of electric motors M1 and M2 for controlling the rotation angles of the crank mechanisms 4a and 4b,
The clamp bar CB has a plurality of clamp hands H1, H2, and H3 that hold the plurality of supply workpieces W corresponding to the dies K1, K2, and K3 of the press machine M at the front side and convey them simultaneously. The clamp hands H1, H2, and H3 are provided at intervals, and the clamp hands H1, H2, and H3 extend from the clamp bar CB to one side orthogonal to the conveyance direction, and a pair of grip claws J that grip the supply workpiece W, and the clamp bar A claw opening / closing mechanism 30 that is housed in a housing 28 attached to the upper surface of the CB and that continuously opens and closes the grip claw J and moves the grip claw J forward and backward in the extending direction; The front end facing the inner center of the opening / closing mechanism 30 engages with the claw opening / closing mechanism 30 and the rear end extends from the housing 28 toward the other side orthogonal to the conveying direction of the clamp bar CB. The feed shaft obtained by the rotation angle difference of each of the crank mechanisms 4a and 4b is arranged in parallel with the actuation shaft DS offset to the other side of the clamp bar CB and connected to each of the rear ends of the plurality of actuation shafts DS. An operation frame 24 that moves the operation shaft DS back and forth through conversion mechanisms 14a and 14b that convert a relative reciprocating linear movement of the bar FB and the clamp bar CB into a lateral movement perpendicular to the transport direction. Consisting of
Due to the synchronous and relative reciprocating linear movement of the feed bar FB and the clamp bar CB, the plurality of supply workpieces W are simultaneously transferred into the press working tact on the dies K1, K2, K3 of the press machine M. The press transfer device is characterized in that it is conveyed in the order of processes. The claw opening / closing mechanism 30 includes a moving casing 26 that is supported in the housing 28 so as to be able to move straight forward and backward, and an opening / closing cam follower 34 that is rotatably supported at the tip of the operating shaft DS that faces the moving casing 26. And a pair of guide cam followers 36a and 36b that are symmetrically located on both sides of the operating shaft DS behind the open / close cam follower 34 and are rotatably supported on the inner bottom surface of the movable casing 26. And a pair of spring housing cases 32a and 32b that are held in a state extending from the side surface of the operating frame 24 so as to face each other, and are housed in the spring housing cases 32a and 32b. A pair of springs SP to be energized, and flat plates that are superposed on each other and housed in the moving casing 26 and on the front side of the flat plates. The open / close cam follower 34 is inserted and fitted into the intersecting portions of the inclined long holes 40a and 40b that are formed symmetrically to each other, and ends on both side ends of the flat plates behind the inclined long holes 40a and 40b. A pair of upper and lower claw opening / closing plates 38a, 38b configured such that the pair of guide cam followers 36a, 36b are respectively inserted and fitted into horizontally elongated holes 42a, 42b formed so as to be open at the top and bottom, A pair of gripping arms R1, R2 in which both tip portions spaced forward from the opposite ends of the claw opening / closing plates 38a, 38b and extending forward are biased inward by the action of the spring SP1; 2. The press according to claim 1, comprising a pair of gripping claws J which are detachably attached to the tips of the gripping arms R1 and R2 and grip both side surfaces of the supply work W horizontally. Lance fur apparatus. In the clamp hands H1, H2, and H3, the pair of gripping claws J in the retracted position resists the urging force of the spring SP by the operating shaft DS of the operating frame 24 in the position farthest from the side surface of the transfer bar TB. Held in the retracted position and opened by the claw opening / closing mechanism 30 in the movable casing 26,
The gripping claw J in the open state cooperates with the operating shaft DS that moves straight forward and forward to one side of the clamp bar CB perpendicular to the conveying direction by the relative straight movement of the feed bar FB and the clamp bar CB. After the movable casing 26 moves to the forward end by the biasing force of the spring SP, the gripping claws J moved to the forward end via the pawl opening / closing mechanism 30 by the further forward movement of the operating shaft DS are closed and the Hold the supply workpiece W,
The gripping claws J in the state of gripping the supply workpiece W at the forward movement position of the operation frame 24 at the position closest to the side surface of the transfer bar TB due to the relative linear movement of the feed bar FB and the clamp bar CB. In the backward movement of the operating shaft DS, the pawl opening / closing mechanism 30 is operated against the urging force of the two springs SP holding the movable casing 26 at the forward end to open the pair of gripping arms R1, R2. The press transfer device according to claim 1, wherein the press transfer device is configured to move to a retracted position by further retracting the operating shaft DS.

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