JPH0230343A - Work holder for plate stock working machine - Google Patents

Abstract

PURPOSE:To enable smoothly inserting the front end parts of both jaw members even if droop, etc., exist, by swinging the front end part of the lower jaw member downward at releasing time of the both jaw members and swinging the front end part to of the lower member upward at closing time. CONSTITUTION:In the case of opening the front end of work holder, the upper jaw member 20 is abutted on a lower part of a cam face 31a, therefore, as for the cam member 30, its small diameter part 33 is loaded on the casing 7. In this condition, the front end part of the lower jaw member 10 is positioned on the lower position than the lower surface of the word loaded on the table, the work is possible to be easily inserted between the both jaw members 10, 20.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a work holder in a plate processing machine such as a punch press machine.

[Conventional technology]

In a plate processing machine such as a punch press machine, a plate (hereinafter referred to as a work) is placed on a work table and held by a work holder.゛This work holder is
The carriage is movable in the left and right directions and is fixed to a loss slide, and the carriage is movable in the front and rear directions together with the moving table. This results in
The work held by the work holder can be moved back and forth and left and right on the table.

The work holder is composed of a lower jaw member and an upper jaw member that are rotatably connected to each other, and when gripping the work, the tip portions of both jaw members are closed by a cylinder, and when releasing the grip, the ends of the jaw members are closed. The tip portions of both jaw members are left open.

The tip of the lower jaw member is located slightly above the table surface so as not to interfere with the table surface when the workpiece is gripped and moved. This position is approximately flush with the lower surface of the plate placed on the table.

[Problem to be solved by the invention]

In the work holder, the contact surface (reference surface) with the work when the work is gripped is the coordinate reference for the machining position of the work. Therefore, when gripping the work, the work is placed on the reference surface of the work holder. It is necessary to contact them accurately.

However, if the workpiece has a sag or is slightly bent, and the end thereof hangs downward, the workpiece will not be inserted smoothly between the lower jaw member and the upper jaw member.

Therefore, if the tip of the lower jaw member is positioned below the bottom surface of the workpiece, it is thought that the workpiece will be inserted smoothly even if the workpiece is sagging. A problem arises in that the tip of the lower jaw member interferes with the table surface.

This invention has been made in view of the above problems, and is a plate processing machine that allows the workpiece to be easily inserted into the workholder even if the workpiece has sag, and in addition, the workpiece holder does not interfere with the table surface when moving the workpiece. The purpose is to obtain a work holder.

(Means for Solving the Problems) A work holder for a plate material processing machine according to the present invention has a lower jaw member and an upper jaw member that are rotatably connected to each other, and the tips of both jaw members are opened and closed to work the workpiece. At least the tip of the lower jaw member is made swingable in the vertical direction, and the tip of the lower jaw member is positioned below the lower surface of the workpiece on the table when the tips of both jaw members are opened. Further, the distal end portions of the lower jaw members are configured to swing upward in conjunction with the operation in which the distal end portions of the double jaw members are closed for gripping the workpiece.

[Effect]

In this invention, when the workpiece is not gripped, that is, when the tips of both jaw members are open, the tips of the lower jaw members swing downward from the lower surface of the workpiece, causing the workpiece to droop or bend. However, the workpiece can be smoothly inserted between both jaw members.

On the other hand, when a workpiece is inserted and the tips of both jaw members are closed to grip the workpiece, the tips of the lower jaw members move upward in conjunction with this gripping operation, that is, at the same height as the conventional height position. Lift to position. This can prevent the tip of the lower jaw member from interfering with the table surface.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional configuration diagram of a work holder according to an embodiment of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a sectional view taken along the line ■--■ in FIG. 2. In these figures, 10 is a lower jaw member, the front half of which (the right side in the figures is the front) has a bifurcated structure. The upper jaw member 20 is disposed at the bifurcated portion, that is, the center portion in the width direction, and both are rotatably connected to each other by the fulcrum pin 1. Therefore, the distal end 12.22 of the bijaw member 10.20 can be opened and closed. Further, a cylinder 2 is fixed to the rear end 21 of the upper jaw member 20, and the tip of the operating rod 3 is in contact with a plate 4 provided at the rear end 11 of the lower jaw member 10. . Note that the main body of the cylinder 2 is movable in the vertical direction together with the upper jaw member 20. That is, the main body of the cylinder 2 and the upper jaw member end portion 21 are integrally screwed together.

As shown in FIGS. 2 and 3, the rear end 11 of the lower jaw member 10 is rotatably attached to the cross slide 6 by means of a parallel pin 5. Therefore, the tips of the double-jaw members 10.20, that is, the gripping ends of the work holder, can swing vertically about the parallel pin 5 (see arrow A in FIG. 1).

Note that the cross slide 6 is movably mounted on a carriage (not shown).

Further, a side wall 13 at a substantially central portion of the lower jaw member 10 is provided with a mechanism for vertically swinging the gripping end of the work holder. This mechanism will be explained below with reference to FIG. 4(a). FIG. 4(a) is a sectional view taken along the line IV-IV in FIG. 2. Stepped holes 1 are provided in both side walls 13 of the mandibular member 10.
4 is formed, and a cam member 30 is fitted into this hole 14. The cam member 30 has a cam surface 31a on its end surface.
cam portion 31, large diameter portion 32, and small diameter portion 33.
It consists of and the large diameter portion 32 and the small diameter portion 3
3 can protrude outward from the hole 14 of the lower jaw member 10, and the protruding portion is placed on the casing 7. That is, as described above, the lower jaw member 10, which is swingable around the pin 5, is supported on the casing 7 via either the large diameter portion 32 or the small diameter portion 33.

A spring 8 is provided in the hole 14 of the lower jaw member 10 to bias the cam member 30 inward (towards the center). Further, a notch 34 is formed below the cam member 30, and the tip of the locking screw 9 for rotation prevention engages with this notch 34. The casing 7 is disposed on both sides of the rear half of the double-jaw member 10.20, as shown in FIG. 2, and is fixed to the cross slide 6 with bolts.

Further, the rear end portion 11 of the lower jaw member 10 is configured to move upward when receiving a shock such as a collision. That is, as shown in FIG. 3, the parallel pin 5 engages with a notch 6a formed in the cross slide 6 in the vertical direction, and is movable in the vertical direction. A spring case 40 is fixed to the upper surface of the cross slide 6, and inside this case 40,
A spring 41 that presses the parallel pin 5 downward via the pin 42 and spacer block 43 is housed.

Next, the operation will be explained.

The normal workpiece gripping and releasing operations are the same as in the past. That is, when gripping a workpiece, the cylinder 2 shown in FIG. 1 is operated to cause the rod 3 to protrude. Then, since the tip of the rod 3 is in contact with the plate 4 of the lower jaw member 10, the cylinder body side moves upward. Since this cylinder body and the rear end 21 of the upper jaw member 20 are fixed, the rear end 21 of the upper jaw member 20 also moves upward.

As a result, the tip 22 of the upper jaw member 20 rotates clockwise around the fulcrum pin 1 and moves downward, and the lower jaw member 10
The workpiece is gripped together with the tip 12 of the gripper. The grip release operation is performed by a reverse operation.

The action of the tip of the lower jaw member 10 as the work holder tip opens and closes will be explained based on FIGS. 4 and 5. When the tip of the work holder is open as shown in FIG. 4(b), the upper jaw member 20 is opened as shown in FIG. 4(a).
is in contact with the lower part of the cam surface 31a, so that the small diameter portion 33 of the cam member 30 is placed on the casing 7.

In this state, the tip of the lower jaw member 10 is located further below the lower surface of the workpiece placed on the table, so the workpiece can be easily inserted between the jaw members 10.20.

On the other hand, along with the above-mentioned grasping operation, as shown in FIG.
When the rear end portion of the upper jaw member 20 rises as shown in FIG. 32 protrudes from the hole 14.

As a result, the large diameter portion 32 is placed on the upper surface of the casing 7, and the lower jaw member 10 is positioned higher than in FIG. 4(a).

Therefore, the tip of the lower jaw member 10 also rotates counterclockwise around the parallel pin 5 and rises, and the tip of the lower jaw member 10 does not interfere with the table surface even when moving the workpiece.

Moreover, even if there is a collision, the parallel bin 5 at the rear end of the lower jaw member 10
moves by pushing the spring 41 upward via the spacer block 43 and pin 42, thereby avoiding damage to various parts.

In this way, in this embodiment, the tip of the subcontractor member 1o is lowered or raised in conjunction with the opening/closing operation of the double-jaw members 10.20, making it easy to insert the workpiece without providing a special control mechanism. It is also possible to avoid collision between the work holder and the table surface during movement.

In the above embodiment, the entire work holder is swung by the operation of the cam member, and the tip of the lower jaw member is moved in the vertical direction. However, at least the tip of the lower jaw member is linked to the gripping operation of the work holder. All you have to do is move it up and down.

〔Effect of the invention〕

As described above, according to the present invention, when the double-jaw member is opened, the tip of the subcontractor member is swung downward, and when the tip of the double-jaw member is closed for gripping a workpiece, this movement is performed. Since the tip of the mandible member is swung upward in conjunction with Furthermore, there is an effect of preventing the lower jaw member from interfering with the table surface when moving the workpiece.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional configuration diagram of a work holder according to an embodiment of the present invention, Fig. 2 is a plan view thereof, and Fig. 3 is a -
■ Line sectional view, Fig. 4(a) is a sectional view showing the state of the cam member when releasing the work, Fig. 4(b) is a drawing showing the state of the work holder at that time, Fig. 5(a) is A sectional view showing the state of the cam member when gripping the workpiece, and FIG. 5(b) is a diagram showing the state of the workpiece holder at that time. 2... Cylinder, 5... Parallel pin, 10... Lower jaw member, 20... Upper jaw member, 30... Cam member.

Claims (1)

[Claims] (1) In a work holder for a plate material processing machine, which has a lower jaw member and an upper jaw member that are rotatably connected to each other, and which grips a plate material on a processing table by opening and closing the tips of both jaw members, At least the tip of the lower jaw member is configured to be swingable in the vertical direction, and when the tip of the both jaw members are opened, the tip of the lower jaw member is lower than the lower surface of the plate placed on the processing table. 1. A work holder for a plate processing machine, characterized in that the work holder is located below and swings upward in conjunction with the closing of the ends of the jaw members when gripping a plate.