JPH0532899U - Press slide drop prevention device - Google Patents

Abstract

(57) [Summary] [Purpose] The safety of workers is prevented by preventing the slides from accidentally falling. [Structure] A slide rack 2 is dropped by engaging a locking rack 10a having a large number of teeth 10c in the vertical direction on the upright 1a side of the press body 1 and engaging a tooth 10c of the locking rack 10a on the slide 2 side. In a slide drop prevention device of a press, which is provided with a lock pin 10b capable of advancing and retracting, a slide adjustment amount is calculated by detecting the current position of the slide 2 stopped at an arbitrary position, and the obtained slide adjustment amount is calculated. By adjusting the slide 2 up and down by the slide adjusting mechanism 4 so that
The tooth 10c of the locking rack 10a and the position of the lock pin 10b are made to coincide with each other, so that even if the slide 2 is stopped at an arbitrary position, the lock pin 10b reliably engages with the tooth 10c of the locking rack 10a. Therefore, the slide can be prevented from falling.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a slide fall prevention device for a press that prevents a slide from accidentally falling.

[0002]

[Prior Art]

 In the conventional press, there are times when a person enters the press to perform work when changing dies. At this time, if the slide is accidentally dropped, the worker may be injured. Therefore, conventionally, a slide drop prevention device as shown in FIGS. 1 and 2 is provided to prevent the slide from being accidentally dropped. is doing. That is, in the above-mentioned conventional slide dropping device, a locking rack b having saw tooth-shaped locking teeth a is provided on the upright f side of the press so as to be vertically adjustable, and the locking rack b is provided on the slide c side. By locking the lock pin d, the slide c is locked from falling.

[0003]

[Problems to be solved by the device]

 In the above-mentioned conventional slide fall prevention device, the position of the locking rack b can be adjusted in the vertical direction according to the die height or the like, but at the position where the locking teeth a and the tips of the locking claws abut. The slide c drops until the lock pin d is locked to the lower position tooth a. In other words, the amount of slide drop is one pitch of the maximum locking tooth a, which poses a safety problem and requires a strong support structure to absorb the drop energy of the slide. There were also problems such as. The present invention has been made for the purpose of improving the above problems, and an object of the present invention is to provide a slide fall prevention device for a press capable of reliably preventing a slide fall.

[0004]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a locking rack having a plurality of vertical teeth on the upright side of the press body, and a locking rack tooth on the slide side. In the slide drop prevention device of the press, which is equipped with a lock pin that can be moved forwards and backwards to prevent the slide from falling by engaging with the slide, calculate the slide adjustment amount by detecting the current position of the slide stopped at any position. Then, the slide adjustment mechanism adjusts the slide up and down so that the obtained slide adjustment amount is obtained, so that the teeth of the locking rack and the position of the lock pin are aligned with each other.

[0005]

[Work]

 With the above configuration, even if the slide is stopped at an arbitrary position during die height adjustment or the like, the lock pin is always engaged with the teeth of the locking rack, so that the slide does not drop accidentally during work.

[0006]

【Example】

 An embodiment of the present invention will be described in detail with reference to the drawings shown in FIGS. In FIG. 3, reference numeral 1 denotes a press main body, which has a slide 2 that can move up and down, and a slide adjusting mechanism 4 is provided at a point 3 portion of the slide 2. The slide adjusting mechanism 4 has a screw member 5a formed on a plunger 5 which is vertically moved by a slide driving mechanism (not shown), and a nut member 4a provided on the slide 2 side is screwed into the screw member 5a. The worm 4c is meshed with the worm wheel 4b provided on the.

An adjusting motor 6 is connected to the worm 4c, and by rotating the worm wheel 4b via the worm 6 by the adjusting motor 6, the die height H from the bolster 1b to the bottom surface of the slide 2 can be arbitrarily set. The adjusted die height H is detected by a detector 7 such as a resolver.

A lock mechanism 10 is provided between the upright 1 b of the press body 1 and the slide 2. The lock mechanism 10 includes a locking rack 10a provided on the upright 1b side and a lock pin 10b provided on the slide 2 side, and the lock pin 10b is a lock formed by an air cylinder provided on the slide 2 side. The cylinder 11 is movable toward and away from the locking rack 10a, and the tip of the lock pin 10b can lock the teeth 10c of the locking rack 10a.

The locking rack 10 a has teeth 10 c formed at a constant pitch P, and its upper end is fixed to the upright 1 a by a fixing tool 12. The lower end of the locking rack 10a is in contact with a stopper 10e fixed to the upright 1a by a pin 10d from above, and is supported by the load acting on the locking rack 10a by the stopper 10e.

Next, the operation will be described in detail with reference to the flowchart shown in FIG. When working with the slide 2 stopped at an arbitrary height when exchanging dies, first lower the slide 2 from the top dead center and then slide the slide 2 at an arbitrary height in step (1) of FIG. Is stopped, the slide adjustment amount is calculated by step (2) by a control device (not shown) so that L ₂ + S + H = L ₁ + P × n.

L _{1 is} the height from the upper surface of the bolster to the bottom teeth of the locking rack (constant). L _2: from the slide lower surface until the lock pin the bottom surface height. H: Die height, detected by the detector 7. P: Pitch of locking rack teeth. n: the number of teeth. s: A stroke amount of the slide, which is detected by a slide stroke detector provided in a cam switch or the like.

When the slide adjusting amount is calculated as described above, step (3) the adjusting mechanism 4 is driven by the adjusting motor 6 to move the slide 2 up and down. Then, when the slide 2 is stopped when the calculated slide adjustment amount is reached, the positions of the lock pin 10b and the teeth 10c of the locking rack 10a coincide with each other, so that the lock cylinder 11 is operated in step (4). , The lock pin 10b is advanced to the locking rack 10a side, and the lock pin 10b is engaged with the tooth 10c of the locking rack 10a as shown in FIG. As a result, the tip of the lock pin 10b is securely locked to the teeth 10c of the locking rack 10a, so that it is possible to reliably prevent the slide 2 from accidentally falling during the work.

Next, when the work in the press is finished and the lock of the slide 2 is released, the lock pin 10b is moved backward by the lock cylinder 11 in step (5) of the flow shown in FIG. Then, the slide adjusting mechanism 4 is driven by the adjusting motor 6 to return the slide 2 to the position before adjustment. This allows the operation of the press to start in step (7).

[0014]

[Effect of the device]

 As described in detail above, even if the slide is stopped at an arbitrary position when adjusting the die height, the lock pin provided on the slide and the teeth of the locking rack provided on the upright side are aligned with each other. Since the height of the slide is automatically adjusted, the slide does not drop accidentally while working in the press and the safety of the worker is ensured. Further, since the slide rack does not exert a large impact force on the locking rack side, the size of the entire apparatus can be reduced.

[Brief description of drawings]

FIG. 1 is a front view of a conventional slide fall prevention device.

FIG. 2 is a view from the direction of arrow A in FIG.

FIG. 3 is a front view showing a slide fall prevention device according to an embodiment of the present invention.

FIG. 4 is a flowchart showing the operation of the present invention.

[Explanation of symbols]

1 ... Press body, 1a ... Upright, 2 ... Slide, 4
… Slide adjust mechanism, 10a… Locking rack, 10
b ... Lock pin, 10c ... Teeth.

Claims (1)

[Scope of utility model registration request] 1. A slide 2 by engaging a locking rack 10a having a plurality of teeth 10c in the vertical direction on the upright 1a side of the press body 1 and engaging a tooth 10c of the locking rack 10a on the slide 2 side. In a slide drop prevention device of a press, which is provided with a lock pin 10b for preventing the fall of the slide, the slide adjust amount obtained by calculating the slide adjust amount by detecting the current position of the slide 2 stopped at an arbitrary position By adjusting the slide 2 up and down by the slide adjusting mechanism 4 so that the amount becomes equal, the teeth 10c of the locking rack 10a and the lock pin 10b
A slide fall prevention device for presses that matches the positions of.