JP2000094074A - Press feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniature a press feeder with a relatively simple constitution. SOLUTION: A press feeder is provided with a feeder body 2, a rocking arm 10 fitted to the feeder body 2 in a rocking manner, a pair of feed rolls 20, 22 to feed a work, and a release mechanism 38 to release the feeding condition of a pair of feed nulls 20, 22. One feed roll 20 is rotatably supported by the feeder body 2, while the other feed roll 22 is rotatably by the rocking arm 10. The release mechanism 38 includes a leaf spring 40 fitted between the rocking arm 10 and the feeder body 2, a link mechanism 42 connected to the leaf spring 40, and a motor 44 to operate the link mechanism 42.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press feeder for intermittently supplying a work toward a working area of a press.

[0002]

2. Description of the Related Art When a band-shaped work (workpiece) is pressed, a press feeder for intermittently feeding the work toward a processing area of a press device is used. As an example of the press feeder, For example, the one shown in FIG. 7 is known. Referring to FIG. 7, a known press feeder includes an apparatus main body 102, and a pair of feed rolls 104 and 106 are provided on the apparatus main body 102. One of the feed rolls 104 is rotatably mounted on the apparatus main body 102, and is driven by a drive motor (not shown) as indicated by an arrow 10 in FIG.
It is intermittently driven to rotate in a predetermined direction indicated by reference numeral 8. The other feed roll 106 is rotatably supported by a pair of swing arms 112 (only one is shown in FIG. 7) that is swingably supported by the apparatus main body 102 via a support pin 110. The pair of swing arms 112 are connected to the connection member 11.
4,115. One connecting member 1
An air cylinder mechanism 116 is provided below 14, and a rod portion 120 provided on a piston 118 protrudes from the cylinder 122. Usually, the cylinder mechanism 116
Is held in an extended state, so that the tip of the rod 120 acts on the connecting member 114 to push it upward, and the swing arm 112 is positioned at the angular position shown in FIG. A pair of feed rolls 104, 1
06 are held in a state where they are pressed against each other. In this feeding state, when the feed roll 104 is driven to rotate in a predetermined direction, the strip-shaped work nipped by the pair of rolls 104 and 106 is fed from right to left in FIG.

In connection with the swing arm 112, a release mechanism 124 for releasing the feed state of the feed rolls 104 and 106 is provided. Release mechanism 12
4 has a release cam 126 and a release arm 128. The rotation center of the release cam 126 is eccentric, and the release cam 126 is drivingly connected to a crankshaft (not shown) of a press device by a belt or the like, and is rotated in a predetermined direction in synchronization with the crankshaft. The release arm 128 is swingably mounted on the apparatus main body 102 via a support pin 130, and a cam follower 132 is mounted on one end thereof. The release mechanism 124 is connected to the other connecting member 115.
And a push bolt 134 screwed into it. FIG.
As shown in (1), the tip of the push bolt 134 abuts on the action portion 135 of the release arm 126, whereby the cam follower 132 acts on the cam surface of the release cam 126.

When the release cam 126 rotates in synchronization with the crankshaft of the press device and the release arm 128 swings in the direction indicated by the arrow 136 via the cam follower 132, the push bolt 134 is caused by the swing of the release arm 128. Is depressed, thereby causing the swing arm 112
Swings counterclockwise around the support pin 110 against the lifting action of the air cylinder mechanism 116, and the feeding state of the pair of feed rolls 104 and 106 is released.

When the release cam 126 is further rotated to the angular position shown in FIG. 7, the rod portion 120 of the air cylinder mechanism 116 is extended, and the swing arm 112 is moved to the support pin 110.
, And the pair of feed rolls 104 and 106 are held in a feeding state. When the swing arm 112 swings as described above, the release arm 128 swings in the direction indicated by the arrow 138 via the push bolt 134 and is kept in the original state.

[0006]

In such a conventional press feeder, a pair of feed rolls 104 and 106 are used.
An air cylinder mechanism 116 is used to maintain the feeding state of the pair of feed rolls 104 and 106, and a release cam 126 and a release arm 128 are used to release the feeding state of the pair of feed rolls 104 and 106.
6 is drivingly connected to its crankshaft by a belt or the like in order to synchronize with the movement of the press device.

However, in the conventional press feeder, the air cylinder mechanism 116, the release cam 126, the release arm 128, and the like are required, so that the configuration is complicated and the apparatus itself is expensive. Further, if such a feeder is applied to a high-speed press, a speed reducer for reducing the rotation of the crankshaft of the press and transmitting the rotation to the release cam 126 is required, which also makes the device complicated and complicated. There is a problem that the apparatus becomes expensive and the whole apparatus becomes large.

An object of the present invention is to provide a press feeder which can be reduced in size with a relatively simple structure. Further, another object of the present invention is to provide a press feed device which can be conveniently applied to a high-speed press working work feed.

[0009]

According to the present invention, there is provided an apparatus main body,
A swing arm swingably mounted on the apparatus main body, a pair of feed rolls for intermittently feeding a work toward a processing area of a press device, and a feeding state of the pair of feed rolls. A release mechanism for releasing, wherein one of the pair of feed rolls is rotatably supported by the apparatus body, and the other feed roll is rotatably supported by the swing arm, In the press feeder, wherein the release mechanism swings the swing arm in a release direction to release a feed state of the pair of feed rolls, the release mechanism has one end connected to the swing arm, and A leaf spring having an end connected to the apparatus body, a link mechanism connected to an intermediate portion of the leaf spring, and a motor for operating the link mechanism. When the motor rotates in a predetermined direction, the leaf spring elastically deforms in a bending direction via the link mechanism, whereby the swing arm swings in a direction away from the one feed roll, and 1, the feed state of the pair of feed rolls is released, and when the motor rotates in a direction opposite to a predetermined direction, the leaf spring returns to the extension direction via the link mechanism. Thereby, the swing arm swings in a direction approaching the one feed roll to be positioned at the second angular position, and thus the pair of feed rolls is held in the feeding state. .

According to the present invention, a leaf spring is provided between the apparatus main body and the swing arm, a link mechanism is connected to the leaf spring, and the link mechanism is operated by a motor. The configuration of the release mechanism for bringing the feed roller into the release state can be simplified, whereby the configuration of the entire press feeder can be simplified and the manufacturing cost can be reduced.

In this press feeder, when the motor rotates in a predetermined direction, the leaf spring is elastically deformed in the bending direction via the link mechanism and the swing arm is positioned at the first angular position. Feed rolls are held in a released state. In this release state, the other feed roll is located away from one feed roll,
The nip state of the work by the pair of feed rolls is released, and therefore, the work can be moved and positioned at a predetermined position. When the motor rotates in the direction opposite to the predetermined direction, the leaf spring is restored in the extension direction via the link mechanism, and the swing arm is positioned at the second angular position. Held in state. In this feeding state, the pair of feed rolls is held in a press-contact state via the work, and the feed roll is driven to rotate, whereby the nipped work is fed toward the processing area of the press device.

As described above, the pair of feed rolls are selectively held in the feed state and the release state by using the rotation of the motor, so that the holding state can be controlled quickly and easily, and the high speed can be achieved. It can be conveniently used as a feed device of a press device for performing press working. Also,
Since the swing arm is swung using the bending of the leaf spring, the swing arm can be swung with a simple configuration. In connection with this, the mechanism for swinging the swing arm can be further simplified, and the workpiece can be fed sufficiently following the high-speed operation of the press device. Furthermore, since it has a flexible structure using a leaf spring, vibration when the pair of feed rolls nip the work is small, and vibration and noise of the feeder can be reduced.

Further, according to the present invention, the link mechanism includes a first link having one end connected to the leaf spring and a second link having one end connected to an output portion of the motor. The other ends of the first and second links are rotatably connected.

According to the present invention, since the link mechanism connected to the leaf spring is composed of the first and second links, the mechanism for swinging the swing arm is similar to the toggle link mechanism. Thus, a pressure increasing mechanism utilizing the deflection of the leaf spring is provided, and a large nip force can be obtained with a small motor torque.

Further, according to the present invention, a swing angle limiting member is provided in association with the link mechanism, and the swing angle limiting member is configured to rotate the first or second motor when the motor rotates in a predetermined direction. And a first blocking portion for preventing the swing arm from swinging beyond the first angular position by contact.

According to the present invention, the swing angle limiting member has a first blocking portion for blocking swing beyond the first angular position. When the motor rotates in a predetermined direction and the first or second link comes into contact with the first blocking portion, the swing arm is positioned at the first angular position, whereby the pair of feed rolls is released. Is held.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a press feeder according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a sectional view showing an embodiment of a press feeder according to the present invention, and FIG. 2 is a sectional view taken along the line II-II in FIG.
FIG. 3 is a cross-sectional view showing the link mechanism of the press feeder of FIG. 1 and its vicinity, and FIG.
FIG. 5 is an operation explanatory diagram for explaining movements of a link mechanism and a leaf spring in the press feeder of FIG. 1;
FIG. 6 is a cross-sectional view illustrating a state where a pair of feed rolls are in a release state, and FIG. 6 is a block diagram illustrating a control system of the press feeding device in FIG. 1.

Referring to FIGS. 1 and 2, the illustrated press feeder includes an apparatus main body 2, and the apparatus main body 2
And a pair of support walls 6 and 8 (see FIG. 2) which are disposed at intervals in a direction perpendicular to the work transfer direction (a direction perpendicular to the paper surface in FIG. 1 and a horizontal direction in FIG. 2). A swing arm 10 is provided between the pair of support walls 6 and 8. The swing arm 10 includes arms 12 and 14 disposed inside a pair of support walls 6 and 8,
A connection portion 16 for connecting one end portion of each of the support walls 2 and 14, and the connection portion 16 is supported by a support wall 6 via a bearing 17 and a support pin 18.
8 swingably supported. This swing arm 10
Is swingable between a first angular position shown in FIG. 5 and a second angular position shown in FIGS.

The press feeder includes a pair of feed rolls 2 for feeding a band-shaped work (workpiece) in a direction indicated by an arrow 4 toward a working area of a press device (not shown).
0, 22 and one (lower in this embodiment)
Is supported by the apparatus main body 2, and the other (upper in this embodiment) feed roll 22 is supported by the swing arm 10. Referring mainly to FIG. 2, shaft portions 23 and 24 are provided at both ends of the feed roll 20, and these shaft portions 23 and 24 are rotatably supported by the support walls 6 and 8 via bearings 25. . Shafts 26 and 27 are provided at both ends of the other feed roll 22, and these shafts 26 and 27 are rotatably supported by the arms 12 and 14 of the swing arm 10 via bearings 28. I have.

When the swing arm 10 is at the second angular position, as shown in FIGS. 1 and 2, the pair of feed rolls 20 and 22 are held in a feeding state. In this feeding state, the feeding roller unit 3 of the feed rolls 20 and 22
0 and 32 are held in a contact or pressure contact state. Therefore, if a work is interposed between the pair of feed rolls 20 and 22 in this feeding state, the other feed roll 22 moves slightly upward due to the thickness of the work, and the swing arm 1
The reference numeral 0 slightly swings from the second angular position, and the work is held in the nip by a pair of feed rollers 20, 32. When the swing arm 10 is at the first angular position, the feeding state of the pair of feed rolls 20 and 22 is released as shown in FIG. In this release state, the feed roller portion 32 of the feed roller 22 retreats upward from the feed roller portion 30 of the feed roll 20, and the feed roll portion 32 does not act on the workpiece to be fed. Can be done.

As shown in FIG. 1, a feed motor 34 composed of, for example, a servomotor is mounted on the support wall 6 of the apparatus main body 2.
Drive-coupled. Accordingly, when the motor 34 is driven to rotate in the feeding state, the feed roll 20 is driven to rotate in the direction indicated by the arrow 35, whereby the other feed roll 22 is driven in the direction indicated by the arrow 36.

Referring again to FIGS. 1 and 2, a release mechanism 38 for releasing the feeding state is provided in relation to the other feed roll 22. The illustrated release mechanism 38 includes a leaf spring 40, a link mechanism 42, and a release motor 44 for moving the link mechanism 42. The leaf springs 40 are provided at intervals in a direction perpendicular to the feeding direction indicated by the arrow 4. In this embodiment, a connecting member 46 is attached to the arm portions 12 and 14 of the swing arm 10 by a fixing screw 45, and one end (lower end) of the leaf spring 40 is fixed to the connecting member 46 by a fixing screw 47. . A holder 50 is mounted on the upper wall 48 of the apparatus main body 2, and a support block 52 is mounted on the holder 50 by mounting bolts 51, and the other end (upper end) of the leaf spring 40 is fixed to the support block 52. It is fixed by screws 53. A gauge 54 is interposed between the holder 50 and the support block 52. The gauge 54 is selected according to the thickness of the work to be pressed, and the position of the other end of the leaf spring 38, that is, the position of the portion fixed to the support block 52, is adjusted according to the thickness of the work. I do. For example, when the work to be pressed is thick, the thin gauge 54 is used, while when the work is thin, the thick gauge 54 is used. By selecting the gauge 54 in this manner, the thickness of the work is increased. Irrespective of this, the leaf spring 40 can be kept in a substantially linear state (a state of extending substantially 180 degrees).

Referring to FIGS. 2 and 3, link mechanism 42
Is composed of a first link 56 and a second link 58. One end of the first link 56 is connected to a longitudinally intermediate portion of the leaf spring 40. In this embodiment, a connecting shaft 60 is provided between a pair of leaf springs 40, both ends of the connecting shaft 60 are fixed to the leaf spring 40 by fixing screws 61, and one end of the first link 56 is connected to the connecting shaft 60. It is pivotally connected to the leaf spring 40 via a bearing 60 and a bearing 62.
One end of the second link 58 is connected via a key 64 to an output shaft 63 of a motor 44 composed of, for example, a servomotor, and rotates integrally with the output shaft 63 of the motor 44. The other end of the first link member 56 and the other end of the second link member 58 are rotatably connected to each other via a support pin 66 and a bearing 68.

Referring to FIGS. 1 and 5, link mechanism 42
A swing angle limiting member 70 is provided in association with the second link 58. The swing angle limiting member 70 is attached to the support wall 6 of the apparatus main body 2 together with the motor 44. The illustrated swing angle limiting member 70 includes a first
And a second blocking portion 74 provided at the other end.
And When the motor 44 rotates by a predetermined angle in a predetermined direction (clockwise in FIG. 1) from the state shown in FIG.
As shown in FIG. 5, the second link 58 is connected to the first blocking portion 72.
, So that the swing arm 10
Is positioned at the first angular position, and swinging beyond the first angular position is reliably prevented. When the motor 44 rotates a predetermined angle in a direction opposite to the predetermined direction (counterclockwise in FIG. 1) from the state shown in FIG. 5, as shown in FIG.
The second link 58 abuts on the second blocking portion 74, whereby the swing arm 10 is positioned at the second angular position, and the swing beyond the second angular position is reliably prevented (a pair). When the work is interposed, the feed rolls 20 and 22 of the first and second nips hold the nip before the second link 58 comes into contact with the second blocking portion 74 due to the thickness of the work). When the swing arm 10 is positioned at the second angular position, the pair of feed rolls 20 and 22 are held in the feeding state, so that swing of the swing arm 10 beyond the second angular position is performed. Became blocked, and therefore,
The second blocking section 74 can be omitted.

Next, the operation of the above-described press feeder will be described with reference to FIGS. The press feeder is mounted on a press (not shown). The pair of feed rolls 20 and 22 are normally held in a release state shown in FIG. 5, and a work (not shown) to be processed in such a release state is provided with an opening formed in a side wall 76 of the apparatus main body 2. It is inserted between the pair of feed rolls 20 and 22 through 77 and further guided through the opening 79 formed in the other side wall 78 toward the processing area.

When the workpiece is fed in the direction indicated by the arrow 4 toward the working area of the press, the release motor 44 is rotated in a direction opposite to the predetermined direction. Then, the second link 58 is rotated counterclockwise in FIG.
Of the leaf spring 38 via the link 58 and the first link 56
Is restored in the extending direction, and the swing arm 10 is pressed toward the feed roll 20, whereby the swing arm 10
Is pivoted counterclockwise in FIG. 5 about the support pin 18. At this time, as shown in FIG. 4, the second link 58 rotates from the angular position shown by the solid line to the angular position shown by the dashed line, and the first link 56 is pressed toward the leaf spring 40 by this rotation. The connecting shaft 60 connecting the leaf spring 40 and the first link 56 moves while being pushed from the position X1 to the position X2. When the connecting shaft 60 moves in this way, the leaf spring 40 becomes substantially linear, and the leaf spring 40 is restored in this manner, so that the fixed portion between the leaf spring 40 and the swing arm 10 is moved from the position Q1 to the position Q2. The swing arm 10 is pivoted toward the second angular position. The mechanism by the link mechanism 42 and the leaf spring 40
Similar to the well-known toggle link mechanism, its operation is
A pressure increasing mechanism similar to the toggle link mechanism utilizing the deflection of 0 is formed, and the swing arm 1 is amplified by a large amplified force.
0 is moved toward the second angular position, and in the feeding state, a sufficient nip force can be obtained by utilizing the torque of the motor 44.

When the second link 58 is rotated until just before the second link 58 comes into contact with the second blocking portion 74 of the swing angle limiting member 70, the swing arm 10 is moved via the link mechanism 42 and the leaf spring 40. The pair of feed rolls 20 and 22 are held in the feeding state by the swinging movement up to just before the second angular position, and nip the work interposed therebetween. In this feeding state, the feeding motor 34
Is rotated in a predetermined direction, a pair of feed rolls 20,
22 is rotated in the directions indicated by arrows 35 and 36, and the work nipped in these is fed in the direction indicated by arrow 4.
The feeding of such a work is performed before the processing by the press device is performed. In the feeding state, a driving current is supplied to the motor 44, and therefore, a driving torque of the motor 44 acts on the second link 58, and the driving torque is transmitted to the link mechanism 42 and the leaf spring 40. Is transmitted through the swing arm 10 via the pair of feed rolls 20,
Acting as a nip force of 22.

When the supply of the work is temporarily stopped to release the nip state, the release motor 44 is rotated in a predetermined direction. Thus, the second link 58 is rotated clockwise in FIG. 1, and the leaf spring 38 is elastically deformed in the bending direction via the second link 58 and the first link 56 to move the swing arm 10. The swing arm 10 is lifted away from the feed roll 20 so that the swing arm 10
1 is pivoted clockwise in FIG. At this time, as shown in FIG. 4, the second link 58 pivots from the angular position shown by the dashed line to the angular position shown by the solid line, and this rotation causes the first link 56 to slightly move the second link 56. The connection shaft 60 that connects the leaf spring 40 and the first link 56 is lifted and moved while being pulled from the position X2 to the position X1. When the connecting shaft 60 moves in this manner, the leaf spring 40 is elastically deformed in the bending direction and becomes inverted, and the leaf spring 40 is elastically deformed in this manner, so that the leaf spring 40 and the swing arm 10 are moved. Is fixed at position Q
2 to the position Q1, and the swing arm 10
Is turned to the angular position of.

When the second link 58 is rotated until it comes into contact with the first blocking portion 72 of the swing angle limiting member 70, the link mechanism 42 and the leaf spring 4 are rotated as shown in FIG.
The swing arm 10 is swung to the first angular position via the first roll 0, thereby releasing the feed state of the pair of feed rolls 20 and 22 and releasing the nip state of the work interposed therebetween. You. In this feed release state, the nip state by the pair of feed rolls 20 and 22 is released, so that the work can move freely and can be positioned at a predetermined position. The release of the nip state is performed immediately before processing by the press device.
In the release state, the drive current is supplied to the motor 44, and therefore, the drive torque of the motor 44 acts on the second link 58, and this drive torque causes the link mechanism 42 and the leaf spring 40 to operate. The swing arm 10 is transmitted through the swing arm 10, and the swing arm 10 is securely held at the first angular position.

When the working of the work by the press device is completed, the release motor 44 is again rotated in the opposite direction to the predetermined direction, and the swing arm 10 is moved through the link mechanism 42 and the leaf spring 40 in the same manner as described above. Swinging toward the second angular position, whereby the pair of feed rolls 2
0 and 22 are kept in the feeding state. In this manner, the pair of feed rolls 20 and 22 are held in a feeding state when feeding a work, and in a release state when positioning the work, and the feeding state and the release state are repeatedly performed.

The operation of the feed motor 34 and the release motor 44 of the press feeder is controlled by, for example, a control system shown in FIG. Referring to FIG. 6, this control system includes:
Control means 84 composed of, for example, a microprocessor
The control means 84 is supplied with an input signal from an input means 86. The input means 86 includes a numeric keypad or the like, and the input means 86 sets the rotation speed, drive torque, and the like of the motors 34 and 44. Feeding motor 34
, A drive circuit 88 is provided, and the release motor 44 is provided with a drive circuit 90. The control means 84 controls the motor 3
A drive signal for driving the workpieces 4 and 34 is generated. A drive signal for feeding the workpiece is sent to a drive circuit 88, and a drive signal for release is sent to a drive circuit 90. It is driven to rotate as required.

The control means 84 is also supplied with a control signal T1 from a press device (not shown) for processing a work, and the control means 84 uses this control signal to drive the feed motor 34, A signal for controlling the drive stop and a signal for controlling the forward / reverse rotation of the release motor 44 are generated, and the operation of the motors 34 and 44 is controlled by these signals. The control means 84 is also supplied with a torque detection signal T2 of the motor 44. Control means 84
Is the set value set by the input means 86 and the motor 4
Then, the current supplied to the motor 44 is controlled so that the torque value becomes equal to the set value. Instead of using the torque detection signal of the motor 44, the pressing force of the feed roll 22 may be detected, and the current supplied to the motor 44 may be controlled using the detection signal of the pressing force.

While the embodiment of the press feeder according to the present invention has been described above, the present invention is not limited to such an embodiment, and various modifications and corrections can be made without departing from the scope of the present invention. It is. For example, in the illustrated embodiment, the swing angle limiting member is provided in relation to the second link, but is not limited thereto, and the swing angle limiting member is provided in relation to the first link. You can also. In this case, the first link is the first link of the swing angle limiting member.
And comes into contact with the second blocking portion.

In the illustrated embodiment, the upper feed roll 22 is mounted on the swing arm 10, and the swing arm 10 is swung to move the upper feed roll 22, but this is not the case. Alternatively, the lower feed roll 20 may be mounted on a swing arm, and the swing arm may be swung to move the lower feed roll 20.

[0035]

According to the press feeder of the first aspect of the present invention, the structure of the release mechanism for bringing the pair of feed rollers into the release state can be simplified. The configuration can be simplified, and the manufacturing cost can be reduced. Further, since the pair of feed rolls are selectively held in the feeding state and the release state using the rotation of the motor, the holding state can be controlled quickly and easily. Further, since the swing arm is swung by using the bending of the leaf spring, the swing arm can be swung with a simple configuration. In connection with this, the mechanism for swinging the swing arm can be further simplified. Furthermore, since it has a flexible structure using a leaf spring, vibration and noise of the feeder can be reduced.

Further, according to the press feeder of the second aspect of the present invention, the mechanism for swinging the swing arm is a pressure increasing mechanism similar to the toggle link mechanism using the deflection of the leaf spring. A large nip force can be obtained with a small motor torque. Further, according to the press feeder of the third aspect of the present invention, it is possible to reliably prevent the swing arm from moving beyond the first angular position, thereby holding the pair of feed rolls in the released state. Can be.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a press feeder according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a cross-sectional view showing a link mechanism of the press feeder of FIG. 1 and its vicinity.

FIG. 4 is an operation explanatory diagram for explaining movements of a link mechanism and a leaf spring in the press feeder of FIG. 1;

FIG. 5 is a cross-sectional view showing a state when a pair of feed rolls are in a release state.

FIG. 6 is a block diagram showing a control system of the press feeder of FIG.

FIG. 7 is a cross-sectional view showing an example of a conventional press feed device.

[Explanation of symbols]

 2 Apparatus main body 10 Swing arm 20, 22 Feed roll 38 Release mechanism 40 Leaf spring 42 Link mechanism 44 Release motor 56 First link 58 Second link 70 Swing angle limiting member 72 First blocking section

Claims (3)

[Claims] An apparatus main body, a swing arm swingably mounted on the apparatus main body, a pair of feed rolls for intermittently feeding a work toward a processing area of a press apparatus, and A release mechanism for releasing a feed state of the pair of feed rolls, wherein one of the pair of feed rolls is rotatably supported by the apparatus main body, and the other of the feed rolls is the swinging roll. A press feeder rotatably supported by a moving arm, wherein the release mechanism swings the swing arm in a release direction to release the feeding state of the pair of feed rolls. A leaf spring connected to the swing arm and having the other end connected to the apparatus main body, a link mechanism connected to an intermediate portion of the leaf spring, and operating the link mechanism When the motor rotates in a predetermined direction, the leaf spring elastically deforms in a bending direction via the link mechanism, whereby the swing arm is separated from the one feed roll. And the pair of feed rolls are released from the feeding state, and when the motor rotates in a direction opposite to a predetermined direction, the leaf spring is moved via the link mechanism. Is restored in the extension direction, whereby the swing arm swings in a direction approaching the one feed roll and is positioned at the second angular position, and thus the pair of feed rolls is held in the feeding state. Press feeder characterized by the following. 2. The link mechanism comprises: a first link having one end connected to the leaf spring; and a second link having one end connected to an output of the motor. 2. The press feeder according to claim 1, wherein the other end of the second link is pivotally connected to the other end. 3. A swing angle limiting member is provided in connection with the link mechanism, and the swing angle limiting member is configured to contact the first or second link when the motor rotates in a predetermined direction. 3. The press-feeding device according to claim 2, further comprising a first blocking portion for preventing the swinging arm from swinging beyond the first angular position.