JP2598576B2 - Automatic flat plate punching machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lower movable base when a lower movable base which moves up and down so as to approach and separate from an upper fixed base in a punching machine of an automatic flat plate punching machine shifts to a lowering operation. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic flat plate punching apparatus that prevents a delay in plate operation and prevents damage to members due to errors in mutual operation.

[0002]

2. Description of the Related Art In general, an automatic flat plate punching apparatus for manufacturing base paper used for assembling a paper box or the like is provided with a lower movable base plate which is vertically moved by a toggle mechanism below an upper fixed base plate having a die mounted on the lower surface. And a paper feed mechanism composed of two rows of endless chains for feeding paper sheets to be punched from the paper feed unit to the paper discharge unit through the lower part of the die.
In order to bend and stretch four sets of toggle mechanisms for moving the lower movable base plate up and down, there is known a type of the punching machine using four drive cams fixedly mounted on one drive shaft (see, for example, Japanese Patent Application Laid-Open No. H11-157556). JP-B-61-58279, JP-A-60-319
No. 95).

FIG. 6 is a side view showing an example of such an apparatus. When the lower movable base plate 6 'is lowered, each of the toggle joints 13',. In the stage where the lower movable base plate is at the limit of ascending, the toggle joints 13 '... Are driven by the cam rollers 12'. 1
As a result of being pushed outward by 1 ', it is almost upright. A compression spring 19 for compensating the contact pressure acting on the surface of the driving cam 11 'of the cam rollers 12' is provided on the base 8 'which is located outside the cam rollers 12'. 'Are attached respectively.

In such a conventional punching machine using a driving cam, the means for pressing the cam rollers 12 '... Against the driving cam 11' includes the spring force of the compression springs 19 'and the own weight of the toggle joint itself. It works by. And the relation operation between the paper holding member and the lower movable base plate basically determines the performance of the automatic flat plate punching machine,
It is customary to design these distances to be as small as possible.
The member may be damaged due to contact or the like due to the operation delay.

[0005]

SUMMARY OF THE INVENTION The present invention relates to an automatic flattening apparatus which prevents damage to members caused by insufficient contact pressure due to the pressure contact means of the conventional compression spring and toggle joint itself due to its own weight. The purpose of the present invention is to provide a punching device.

[0006]

According to the present invention, according to the prior art, the contact pressure acting on the driving cam of the cam roller of the toggle mechanism is simply determined by a compression spring.
In addition to the spring force, a member that comes into direct contact with the toggle mechanism, separately linked to the rotation of the drive cam, is attached, and only the error dimension caused by bending and stretching of the toggle joint at the time of processing or assembly or adjusting the release pressure Of the toggle mechanism can be maintained with an appropriate force and with a minimum of movement.

That is, according to the present invention, there is provided a punching machine having a lower movable base plate which moves up and down by a toggle mechanism which is bent and stretched via a driving cam below an upper fixed base plate having a punching die attached to a lower surface thereof. An automatic flat plate punching device comprising an endless paper feed mechanism for feeding a paper sheet to be fed from the paper feeding section to the paper discharging section through the lower side of the above-mentioned die, in accordance with bending and stretching of the toggle mechanism on the base of the punching machine. A rotation lever for rotating the angle is arranged, and a pressure-contacting rod having an adjustable length is provided between the upper end of the rotation lever and a corresponding toggle joint with a shock-absorbing member at the tip. It is intended to provide an automatic flat plate punching device characterized by being attached.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention;
FIG. 1 is a schematic view of an automatic flat plate punching apparatus according to the present invention, in which a paper feeder 2 comprising two rows of endless chains intermittently transferring paper fed from a paper feeder 1 to one side. The members 3... Are fed between the upper fixed base plate 5 and the lower movable base plate 6 of the punching machine 4 to perform punching, and output the paper to the paper discharge unit 7.

Next, FIG. 2 is a cut-away plan view of the punching machine 4,
FIG. 3 is a longitudinal sectional front view of the same.
A drive shaft 10 with a worm wheel 9 on a base 8
, And four driving cams 11... Are attached thereto, and the base end and the upper end are mounted on the base 8 and the lower movable base plate 6 outside these driving cams 11. A toggle mechanism comprising four sets of toggle joints 13... Formed in such a way that the middle thereof can be freely bent by a cam roller 12 is provided upright. Drive cam 1 provided
The toggle joint bends and stretches via 1 and the lower movable base plate 6 moves up and down to perform punching. Up to this point, it is the same as the conventional apparatus shown in FIG.

In the present invention, the member for pressing the toggle joints 13 against the cam rollers 12 is merely a compression spring 19 'in the prior art, but in the present invention, the member is interlocked with the operation of the toggle mechanism. It is formed of separate members that work. That is, two left and right pressure contact member rotating shafts 15a and 15b are laterally provided on the base 8 with the driving shaft 10 interposed therebetween, and the small rollers 16 are respectively mounted on the upper ends of these shafts as shown in FIGS. A floating lever 17 having a freely movable protrusion 17 at the upper end and a pivoting lever 20 provided with a buffer member 19 such as a spring interposed at the distal end thereof. The floating lever 17 is loosely inserted into the pressing member rotating shafts 15a and 15b, and the rotating lever 20 is fixedly attached to the pressing member rotating shafts 15a and 15b. , Drive shaft 10
Are provided with swinging levers 22a and 22b abutting on the guide cams 21a and 21b, which are fixed to one end of the shaft, so that the rotating levers 20 can be adjusted to a specific rotating angle according to a change in the operation of the toggle mechanism. It is configured to be held. In addition, FIG.
In FIG. 5, reference numeral 23 denotes a small roller 1 having a toggle joint 13.
The reference numeral 6 designates an abutment plate attached to a contact portion, 24 designates an adjusting screw of a buffer member, and 25 designates a locking nut.

[0011]

As described above, in the present invention, the drive shaft 10
Swinging lever 22 from guide cams 21a and 21b
The movement transmitted to the pressure contact member rotating shafts 15a and 15b via the pressure contact member rotating shafts 15a and 15b is transmitted to the rotation levers 20 and 20, and the free movement is performed through the pressure contact rod 18 and the cushioning member 19 whose degree of protrusion is adjustable by the rotation. It is transmitted to the lever 17, passes through the small roller 16 incorporated therein, acts on the abutment plates 23, 23 attached to the toggle joint 13, and drives the cam rollers 12, 12 attached to the shaft of the toggle mechanism 11, 11.
In such a state, the stalk, acceleration, deceleration, and timing of the lower movable base plate can be continuously maintained. This is because the lower movable base plate is inherently less inclined to fall due to the weight of the toggle joint in the vicinity of the ascending limit, so that a follow-up delay easily occurs between the drive cam 11 and the cam roller 12. However, in the present invention, first, the cam roller 12 is always pressed against the drive cam 11 by the cushioning member 19, and if this is insufficient, it is usually due to the vertical movement of the toggle mechanism during processing, assembling and adjusting the release pressure. The tip of the pressure contact rod 18 that provides a gap only for the generated error dimension acts directly on the idler lever 17 to force the toggle joint 13 to follow the drive cam 11. Safe driving can be continued without generating a gap.

Next, in the embodiment shown in FIGS. 2 and 3, as shown by a dotted line in FIG. 2, a worm-powered shaft 26 which engages with the worm wheel 9 of the drive shaft 10 is provided in front of the worm gear 14. Overload release clutch 2 located
7 are interposed. As this clutch, a clutch that releases power transmission in response to an overload is used as it is, so that the paper holding member 3 and the like are located between the upper fixed base plate 5 and the lower movable base plate 6 during high-speed operation. The force applied to the worm gear when it is bitten can be cut off to prevent the worm gear from being damaged.

[0013]

According to the automatic flat plate punching apparatus of the present invention,
Even if the distance between the upper fixed base plate and the lower movable base plate moving up and down with respect to the upper fixed base plate is designed to be as small as possible, the abrupt movement of members caused by errors in the movement of both plates Collision can be avoided, and safe operation can be continued without damaging the members.

[Brief description of the drawings]

FIG. 1 is a schematic view of the apparatus of the present invention.

FIG. 2 is a plan view of the cutting machine.

FIG. 3 is a vertical sectional front view of the punching machine.

FIG. 4 is a front view of a main part of a pressing rod portion.

5A is a front view showing a rotation mechanism of a pressing member rotation shaft, and FIGS. 5B and 5C are front views showing the rotation mechanism for left and right swing levers; FIG.

FIG. 6 is a front view showing an example of a conventional device.

[Explanation of symbols]

 1: paper feed unit 2: paper feeder 3: paper holding member 4: punching machine 5: upper fixed base plate 6: lower movable base plate 7: paper discharge unit 8: base 9: worm wheel 10: drive shaft 11: Driving cam 12: Cam roller 13: Toggle joint 14: Worm gear 15a, 15b: Pressing member rotating shaft 17: Floating lever 18: Pressing rod 19: Buffer member 20: Rotating lever 21a, 21b: Guide cam 22a, 22b: Swing Driving lever 24: Adjusting screw for buffer member 26: Power shaft 27: Overload release clutch

Claims (2)

(57) [Claims] 1. A punching machine having a lower movable base plate that moves up and down by a toggle mechanism that is bent and stretched via a driving cam below an upper fixed base plate having a punching die attached to a lower surface, and a sheet to be punched. In an automatic flat plate punching device comprising an endless paper feed mechanism that feeds the paper from the paper feeding section to the paper discharging section through the lower side of the above-mentioned die, a predetermined angle of rotation is performed on the base of the punching machine in conjunction with bending and stretching of the toggle mechanism. And a rotating lever that performs
An automatic flat plate punching device, characterized in that a press-connecting rod having an adjustable length is mounted between the upper end of the rotating lever and the corresponding toggle joint with a buffer member interposed at the tip thereof. 2. A power shaft for transmitting rotation to a drive shaft having a drive cam via a worm gear, wherein an overload release clutch is disposed in front of the worm gear and releases transmission in response to an overload. Item 2. The automatic flat plate punching device according to Item 1.