JPH057405U - Automatic nail supply device for continuous nailing machine - Google Patents

Abstract

(57) [Summary] [Structure] An opening / closing valve 19 is provided on an air passage connecting a feed valve 3 and a compressed air supply source 15 for supplying / exhausting compressed air to / from the feed piston / cylinder mechanism 2.
And the supply valve 20 are arranged in series, the opening / closing valve 19 is opened based on the operation of the trigger valve 1 from the operating end position to the initial position, and the air passage is delayed in the middle of the operation of the supply valve 20. The feed valve 3 and the feed piston / cylinder mechanism 2 are operated by the compressed air supplied from. [Effect] Since the feed piston / cylinder mechanism 2 automatically operates after the nail driving is completed, in the continuous hammering type nailing machine, the nails are automatically supplied when the hammering by the continuous hammering is completed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an automatic nail supply device for automatically supplying nails after a hammering operation of nails by continuous hammering is completed in a hammering machine.

[0002]

[Prior art and its problems]

 In a normal continuous hammering type nailing machine, so-called additional hammering is performed in which one nail is continuously and repeatedly hammered to drive it completely. Since the nail cannot be automatically supplied after each striking operation in the additional striking operation, the nail is supplied by manually operating the nail supply lever every time the driving operation of one nail is completed. ing. However, there are cases where it is not necessary to perform additional work for construction work of wood or the like. If a normal continuous hammering machine is used for these operations, the nail supply lever has to be manually operated every time driving is completed, which has a drawback of impairing workability.

[0003]

[The purpose of the device]

 An object of the present invention is to provide an automatic nail supply device for a continuous hammering nailer that automatically supplies nails at the time when a series of continuous hammering is completed.

[0004]

[Means for achieving the purpose]

 In order to achieve the above object, an automatic nail supply device for a continuous hammering nailer according to the present invention engages with a triggering trigger valve for continuously and repeatedly driving a striking piston by one manual operation, and a connecting nail. A feed piston / cylinder mechanism for supplying each nail to the striking position one by one, and a feed valve for supplying and discharging compressed air to / from the feed piston / cylinder mechanism to operate the feed valve. An on-off valve that connects a part of the air passage to the air passage that connects the air supply source and the feed valve when not in operation and shuts off the air passage when not in operation, and another portion of the air passage from at least the operation end position. A supply valve that communicates with the valve on the way to the initial position is arranged in series, and the opening / closing valve and the supply valve are connected to operate the trigger valve. Based on the compressed air, the opening / closing valve and the supply valve are moved from the operation end position to the initial position when the trigger valve is moved from the operation end position to the initial position, and the supply valve is opened / closed. It is characterized by delayed operation.

[0005]

[Function and effect of the device]

 According to the above configuration, when the trigger valve is actuated and moved from the initial position to the actuating end position, the trigger valve nailer is driven, and at the same time, the opening / closing valve and the supply valve are actuated, and the initial position To the working end position. At this time, the on-off valve shuts off the air passage that operates the feed valve, so the feed valve does not operate. After that, when the nail driving operation is completed and the trigger valve is moved from the operating end position to the initial position, the operation of the nailing machine is stopped and the opening / closing valve and the supply valve are also moved from the operating end position to the initial position. .. At this time, the open / close valve moves first to connect the air passage for operating the feed valve. After that, the supply valve is actuated in a delayed manner, and the other part of the air passage is communicated during the actuation. Therefore, the air passages are communicated with each other, the feed valve is actuated, and thereby the feed piston / cylinder mechanism is actuated to perform nail feeding.

As described above, the feed piston / cylinder mechanism automatically operates when the trigger valve moves from the operating state for driving the nailing machine to the non-operating state. The nails are automatically supplied at the end of a series of impacts by the. Therefore, it is not necessary to manually feed the nails one by one, so the working efficiency is remarkably improved.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an automatic nail supply device for a continuous hammering nailer driven by compressed air. The continuous hammering type nailing machine is designed to drive the striking piston (not shown) continuously and repeatedly by reciprocating motion based on one manual operation of the trigger valve 1 for starting, and then stop. It is provided with a feed piston / cylinder mechanism 2 for supplying each one to the striking position, and a feed valve 3 for supplying / exhausting compressed air to / from the feed piston / cylinder mechanism 2.

The trigger valve 1 is configured such that one end of a valve stem 5 slidably accommodated in a valve cylinder 4 is projected to the outside and a spring 6 biases the valve stem 5 in the direction in which the one end is projected. The protruding end 5a of the stem 5 is formed so as to be pushed in and operated by a manually operated trigger lever (not shown), and compresses the air passages 7 and 8 leading to the on-off valve and the supply valve described later at the operating end position. It is configured to be connected to the air supply source 9 and selectively connected to the atmosphere in the initial position. A part of the air passage is connected to a head valve (not shown). The head valve supplies compressed air to the striking piston / cylinder mechanism to drive the nail driving machine.

The feed piston / cylinder mechanism 2 slidably accommodates a feed piston 11 for supplying and driving a nail in the feed cylinder 10, and a feed claw (not shown) of a connecting nail is attached to the tip of the feed piston 11. When the feed piston 11 is reciprocated, the feed claws feed the connecting nails one by one to the striking position. Air passages 12 and 13 are formed in the front and rear portions of the feed cylinder 10, and the compressed air from the front air passage 12 acts only on the front end surface of the bulging portion 14 formed on the peripheral surface of the feed piston 11. The compressed air from the rear air passage 13 is configured to act on the rear end surface of the feed piston 11. Normally, compressed air is supplied to the front and rear parts, and the effective area for receiving compressed air is larger at the rear end surface, so the feed piston 11 is held at the forward position.

The feed valve 3 constantly connects the front air passage 12 of the feed cylinder 10 to the compressed air supply source 15, and slides the valve stem 30 to connect the rear air passage 13 to the compressed air supply source 15. To the atmosphere, and is always urged in the backward direction by a spring 16 so that the front air passage 12 is always connected to the compressed air supply source 15. The operation of the feed valve 3 in the forward direction is performed by supplying compressed air from the compressed air supply source 15 to the bulging portion 30a on the side of the vane 16, and the bulging portion 14 is exposed to the atmosphere at the operating end position. It opens in the air passage 17 communicating with it, and is returned to the initial position again by the spring 16.

By the way, an opening / closing valve 19 and a supply valve 20 are arranged in series on an air passage 18 that connects the compressed air supply source 15 and the bulging portion 14 side of the feed valve 3. That is, the supply valve 20 is arranged on the compressed air supply source 15 side, and the opening / closing valve 19 is arranged on the feed valve 3 side via the intermediate air passage 18b. Further, the opening / closing valve 19 and the supply valve 20 move the respective valve stems 21 and 22 from the initial position to the operation end position by the supply of the compressed air based on the operation of the trigger valve 1, and discharge the compressed air and the spring. Due to the elasticity of 23 and 24, the valve stems 21 and 22 are configured to return to their initial positions.

The supply valve 20 blocks a part of the above-mentioned air passage, that is, between the compressed air supply source 15 side air passage 18a and the intermediate air passage 18b, at the ends of the valve stem 22 at the initial position and the operating end position. The air passage 18a is opened only when the open ends of the air passages 18a and 18b open between the seal portions 25 and 26 of the valve stem 22 while moving from the operation end position to the initial position or from the initial position to the operation end position. , 18b are set to communicate with each other.

On the other hand, in the initial position, the opening / closing valve 19 makes a part of the air passage, that is, the intermediate air passage 18b communicate with the air passage 18c on the feed valve 3 side. The seal portion 27 blocks the air passages 18b and 18c.

In the supply valve 20 and the opening / closing valve 19, the air passage 8 connecting the supply valve 20 and the trigger valve 1 has a smaller diameter than the air passage 7 connecting the opening / closing valve 19 and the trigger valve 1. Is formed in. For this reason, the supply amount of the compressed air supplied through the trigger valve 1 per unit time is smaller in the supply valve 20 than in the opening / closing valve 19. Therefore, the operation of the supply valve 20 is delayed as compared with the opening / closing valve 19.

Here, an operation mode of the nail supply mechanism having the above configuration will be described. Prior to the operation of the trigger valve 1, each valve is in the state shown in FIG. 1, and the feed piston 11 of the feed piston / cylinder mechanism 2 is held in the forward position. Here, in order to activate the nail driver, the operator operates the trigger lever and pushes the valve stem of the trigger valve 1 from the initial position to the operating end position as shown in FIG. 2, whereby the nail driver is driven. At the same time, the compressed air supply source 9 is opened to the air passages 7 and 8 which branch and communicate with the supply valve 20 and the opening / closing valve 19, and the compressed air is supplied to the supply valve 20 and the opening / closing valve 19. Since the diameter of the air passage 8 communicating with the supply valve 20 is smaller than that of the air passage 7 communicating with the opening / closing valve 19, the valve stem 21 of the opening / closing valve 19 operates faster. Therefore, of the air passages connecting the compressed air supply source 15 and the bulging portion 14 of the feed valve 3, the open / close valve 19 blocks the intermediate air passage 18b from the air passage 18c on the feed valve side, and then supplies the air. The valve stem 22 of the valve 20 moves from the initial position to the working end position. During the operation of the supply valve 20, the compressed air supply source side air passage 18a and the intermediate air passage 18b communicate with each other, but the feed valve 3 does not operate because the opening / closing valve 19 has already cut off the air passages 18b and 18c. .. Therefore, the nail supply device does not operate during the nail driving operation.

After that, when the nail driving operation ends and the operator releases the operation of the trigger lever, the valve stem 5 of the trigger valve 1 returns from the operating end position to the original initial position by the spring 6, as shown in FIG. The compressed air in the air passages 7 and 8 through the supply valve 20 and the opening / closing valve 19 is exhausted to the atmosphere. Also in this case, the diameter of the air passage 8 communicating with the supply valve 20 is smaller than that of the air passage 7 communicating with the supply valve 20, so that the valve stem 21 of the opening / closing valve 19 moves faster and the intermediate air passage 18b is formed. The feed valve 3 side air passage 18c communicates with each other, and then the valve stem 22 of the supply valve 20 returns from the operating end position to the initial position. On the way, the compressed air supply source 15 side air passage 18a communicates with the intermediate air passage 18b, and is cut off again at the initial position. Therefore, compressed air is supplied to the feed valve 3 for a short time while the air passages 18a and 18b communicate with each other, and the valve stem 30 moves forward against the spring 16. However, as shown in FIG. 4, the air passages 18a and 18b are connected to the atmosphere at the operating end, so that the valve stem 30 is retracted by the force of the spring 16.

By the way, when the valve stem 30 of the feed valve 3 is moved forward as described above, exhaust is performed from the rear air passage 13 of the feed cylinder 10 of the feed piston / cylinder mechanism 2 as shown in FIGS. As a result, compressed air is supplied from the front air passage 12 and acts on the front end surface of the bulging portion 14 of the feed piston 11, so that the feed piston 11 retracts and engages with the connecting nail. Next, when the valve stem 30 of the feed valve 3 is retracted, compressed air from the compressed air supply source 15 is supplied from the front and rear air passages 12 and 13 of the feed cylinder 10 as shown in FIG. Returns to the forward position due to the difference in effective area, and supplies the nail to the striking position.

As described above, the above-described automatic nail supply mechanism is basically operated by opening the supply valve 20 and the opening / closing valve 19 when the operation of the trigger valve 1 is released at the end of driving the nail so that the valve of the feed valve 3 is closed. The stem 30 is reciprocally moved, and the feed piston / cylinder mechanism 2 is interlocked with the forward / backward movement to automatically supply a nail. In this way, the feed piston / cylinder mechanism 2 is automatically operated when the trigger valve 1 shifts the nailing machine from the driving state to the stopped state. The nails are automatically supplied at the time when is finished. Therefore, it is not necessary to feed the nails by manual operation one by one, and the work efficiency is remarkably improved.

In the above-described example, the supply valve 20 blocks the compressed air supply source 15 side air passage 18a and the intermediate air passage 18b at the operating end position, but the supply valve 20 is at the initial position. The air passage may be blocked so that the air passage communicates at the operating end position. In this case, the compressed air supply source 15 and the feed valve 3 are operated from the time when the opening / closing valve 19 returns from the operating state to the non-operating state until the valve stem of the supply valve 20 moves from the initial position to the operating end position. Will be connected.

[Brief description of drawings]

FIG. 1 is an explanatory view of a non-operating state of an automatic nail supply device for a continuous hammering nailer according to the present invention.

FIG. 2 is an operation state explanatory view of the automatic nail supply device when the trigger valve for starting the nail driving machine is operated.

FIG. 3 is an explanatory diagram of an operation state of the first half of the automatic nail supply device when the activation trigger valve is changed from an operation state to a non-operation state.

FIG. 4 is an operation state explanatory diagram of the latter half of the automatic nail supply device when the activation trigger valve is changed from an operating state to a non-operating state.

[Explanation of symbols]

 1 Trigger valve 2 Feed piston / cylinder mechanism 3 Feed valve 9 Compressed air supply source 15 Compressed air supply source 19 Open / close valve 20 Supply valve

Claims (1)

[Claims for utility model registration] [Claim 1] A trigger valve for starting which continuously and repeatedly drives a striking piston by reciprocating motion based on one manual operation, and one nail by engaging with a connecting nail. A feed piston / cylinder mechanism for supplying to a striking position, and a feed valve for supplying and discharging compressed air to / from the feed piston / cylinder mechanism to operate, and a compressed air supply source for operating the feed valve and the feed. An on-off valve that communicates a part of the air passage when not in operation and shuts off when the air passage is connected to the air passage that connects the valve, and another part of the air passage at least during the movement from the operating end position to the initial position. And a supply valve that communicates with each other in series, and these on-off valve and supply valve are connected by compressed air based on the operation of the trigger valve. In conjunction with this, when the trigger valve moves from the operating end position to the initial position, the opening / closing valve and the supply valve are moved from the operating end position to the initial position, and the supply valve is actuated later than the opening / closing valve. An automatic nail supply device for a continuous hammering type nailing machine.