JPH07100306B2 - Electric tucker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Industrial Field of Use The present invention operates staple members such as inverted U-shaped, T-shaped, and inverted L-shaped staples, nails, and the like (hereinafter simply referred to as needles) to operate a driving member. The present invention relates to an electric tucker that is hit by a hammer accelerated by the stored force of a spring urged by a spring, and more specifically to a control means thereof.

(B) Conventional technology As an electric tucker equipped with the above control means, conventionally, for example, a main switch that turns on and off a connection circuit between a power supply and a motor in conjunction with a pressing operation of a trigger, a trigger operation only once. JP-A-60-135182, which is provided with a sub-switch connected in series with the main switch to operate the hammer driving means in order to execute the striking of the hammer.
In the structure described in the publication, when the main switch is first turned ON by pressing the trigger, the motor rotates and the hammer at the bottom dead center is pulled up to the top dead center by the drive means, and then the drive is performed. When the hammer is hit by the hammer (hereinafter referred to as needle driving) by breaking the connection between the means and the hammer, when the hammer reaches the bottom dead center, the sub switch is actuated to stop the motor and trigger it. When the operation of is released, the motor is rotated again to feed the driving means until the hammer is ready to start pulling up the hammer, the motor is stopped, and the hammer is made to wait at the bottom dead center (conventional example 1). A connector plate that adopts a worm gear as the driving means and that engages and disengages with the hammer in conjunction with the trigger operation so that the hammer waits at the top dead center. When the hammer is near the top dead center, the switch plate that is elastically urged by the elastic force of the return spring to engage and lock with the hammer is moved away from the switch to turn it off. An electric tucker described in Japanese Utility Model Laid-Open No. 62-81581, which has a control mechanism for ensuring a reset state by releasing the pulling up of the trigger, and waits at the top dead center position by locking with a connector plate. The hammer is released, the locking relationship is released by the pressing operation of the trigger, and needle driving is executed,
Then, regardless of the operation of the trigger, when the hammer is pushed up by the driving means and the hammer reaches the top dead center, the motor stops and the hammer waits at the top dead center position by locking with the connector plate. (Prior art example 2), and further, between the position where the switch button is touched and the switch is turned on when the trigger is pressed, and the position where the switch button is turned off and the switch is turned off. A moving rod is provided, and the rod is moved to a position where the contact with the switch button is broken in cooperation with the hammer striking operation, and when the pressing operation of the trigger is released, the rod is automatically moved to the position where the switch is turned on. Japanese Patent Laid-Open No. 174882/1988
In the electric tucker described in Japanese Patent Publication No. JP-A-2003-138, the motor is rotated by the pressing operation of the trigger and the hammer at the bottom dead center is pulled up to the top dead center by the driving means, and subsequently the relationship between the driving means and the hammer is broken. It is known that when the needle is hit, the motor is stopped and the motor stops, and the hammer waits at the bottom dead center position (conventional example 3).

(C) The problem to be solved by the invention In the above-mentioned conventional electric tucker, first of all, in the conventional example 1, the bottom dead center position of the hammer is set to the starting point of one cycle, so the needle ejection port is set to the object surface. When abutting, the tip of the driver protruding near the needle ejection port becomes an obstacle and positioning is difficult, and the surface to be hit is easily scratched. Since it has to be moved to top dead center, even if the trigger is pressed, the needle is not immediately hit,
The responsiveness is poor, and if the motor is stopped due to the trigger pressing operation being canceled or the battery running out while the hammer is being pushed up, not only will needle striking not be executed, but the hammer will also return to bottom dead center and energy loss will occur. The workability is extremely poor. In addition, since the motor is started twice in one cycle, the electric loss due to the consumption of the starting current cannot be ignored, and the cost increase due to the use of two switches cannot be avoided. Also, in the electric tucker of the reference example 2, since the top dead center position of the hammer is set to the starting point of one cycle, the responsiveness is excellent, but to hit the needle, the hammer waits at the top dead center position. Since the rod to be left must be operated directly by pressing the trigger, the resistance of the trigger operation is large and the operability is poor. Further, when the driving means is stopped due to insufficient battery to push up the hammer due to insufficient battery during the pushing up operation of the hammer, the driving means is a worm gear, so that the hammer is bottom dead as in the prior art example 1. Although it does not return to the point and cause energy loss, the switch remains ON even if the trigger operation is released, which may damage the battery. That is, when a closed circuit including a plurality of batteries and a motor connected in series is formed, if the short-circuit state continues and the remaining electric capacities of the batteries are uneven, the remaining electric capacities of the batteries are excessive. Electrolysis occurs due to discharge, rendering the battery unusable. Further, in the electric tucker of Conventional Example 3, since the start position of the hammer is at the bottom dead center, in addition to the same drawbacks as in the above-mentioned Conventional Example 1 caused by the hammer, the contact of the rod with the switch button is mechanically prevented. If the motor stops in the state where it is moved to the disconnection position, the relationship between the trigger and the switch will remain disconnected, so manually operate the drive mechanism and press the switch button when pressing the trigger. It is necessary to return the switch to the ON position by touching it, and the needle-punching work must be stopped during that time. That is, if the rod moves to a position where it breaks the contact with the switch button, the electrical connection between the power supply and the motor is also cut at the same time, but the inertial force causes the motor to stop with a slight delay. If the rod is set to automatically return to the switch ON position by disconnecting the connection with the means for moving the rod at the time of stop and releasing the pressing operation of the trigger, the rod will not contact the switch button. If the pressing operation of the trigger is released before the disconnection, the above situation may occur depending on the release timing. In terms of drive means, the hammer pushes back the full stroke by half rotation of the rotating body, so not only a large torque is required for that, but also a large radius of rotation must be secured, so it cannot be made compact. There was also a problem.

D. Means for Solving the Problems The present invention provides an electric tucker that is easy to operate and highly reliable in view of the drawbacks that have occurred in the above-described electric tuckers, and its structure is to strike a needle. A hammer, a spring that biases the hammer in the direction of striking the needle, and a drive that pushes the hammer back in the direction opposite to the direction of striking the needle by the rotation of the motor stored in the housing, and accumulates elastic force in the spring. Means, a switch that is fixed in the housing and that turns on and off the connection circuit between the power supply and the motor, and the pressing portion are exposed to the outside of the housing,
A trigger that moves within a predetermined range according to the pressing operation,
During the pressing operation of the trigger, linked to the pressing operation,
Switch on by touching the switch button on the switch
A first operating member that can move between the first position to operate and the second position to put the switch in the OFF position and not in contact with the switch button, and to connect the hammer to the position just before the pushing back end The first actuating member
And a control member provided in the housing for controlling the one-time impact of the hammer, and connected with the control member by the pressing operation of the trigger. , When the hammer leaves the push-back few-end position and the operating position where the switch is turned on by contacting the switch button of the switch,
A second actuating member that is movable between the control member and a free position for turning off the switch, and pushes the hammer back to accelerate from the push-back end position by the elastic force of the spring. And a control means for hitting the needle with a hammer.

When the trigger is pressed, the switch is turned on by the second actuating member to rotate the motor, which causes the hammer that was waiting at the push-back end position to be accelerated by the elastic force of the spring and urged in the striking direction. Move well. After the hammer hits, the pressing force to turn on the switch by the second actuating member cannot be secured, but when the hammer starts moving in the striking direction, the first actuating member moves to the position to turn on the switch. The electrical connection between the power source and the motor is maintained, so when the hammer reaches the end position in the striking direction and the striking of the needle is completed, the hammer is then pushed back in the direction opposite to the striking direction and the hammer is pushed back. When it reaches just before the terminal position, the restricting member blocks the ON operation of the switch by the first operating member, the motor stops, and the hammer waits at that position for only one cycle. Also, those equipped with a safety lever,
The one cycle is executed only when the trigger operation and the safety lever pushing operation are performed at the same time.

F. Embodiment The drawing shows an embodiment of the electric tucker according to the present invention. In FIG. 1, in a housing 1 made of synthetic resin, one corner is a needle punching port P, and the needle punching port P is shown. A needle accommodating magazine portion 2 for sequentially delivering the needles N is provided along the bottom surface, and a hammer 3 that can move back and forth orthogonally to the needle feeding direction is attached to the needle ejection port P side by a coil spring 4. It is provided in the energized state. The hammer 3 has a U-shaped cross section, and the coil spring 4 is held by the U-shaped inner wall of the hammer 3, and the biasing direction of the coil spring 4 is provided in the guide member 4a having the U-shaped cross section which is arranged to face the opening surface. Slidably accommodated in (Fig. 2),
A driver 3a is protrudingly provided at the lower end. Further, a first hooking protrusion 5 and a second hooking protrusion 6 are formed by cutting and raising in two steps on the outer surface, and a third hooking protrusion 7 is provided above it. Further, a deceleration mechanism 9 including a combination of a motor 8 and a gear is provided in an inner portion of the housing 1 adjacent to the needle accommodating magazine portion 2, and is a disk that is a rotating body arranged on the side of the hammer 3. A gear wheel (hereinafter, simply referred to as a disk) 10 is configured to rotate in association with a motor 8 via a speed reduction mechanism 9. The speed reduction mechanism 9 includes
The ratchet pawl 9a prevents reverse rotation (FIG. 3), and the disk 10 has a first drive pin 11 on the side facing the hammer 3.
And the second drive pin 12 are provided so as to project with a phase difference slightly offset from each other by 180 degrees. And disc 10
The hammer 3 and the hooking protrusions 5 and 6 are attached to the drive pins.
Maintaining the relationship that 11 and 12 are positioned on the circular arc trajectory that moves toward the push-back end of the hammer 3 (hereinafter referred to as top dead center),
By rotating the disk 10, the first and second hooking projections 5 and 6 have a hooking relationship with each other within a predetermined range, and the driving pins 11 and 12 and the hooking projections 5 and 6 have different lengths. By attaching
Since the two drive pins are provided so as to project with a phase difference slightly shifted from 180 degrees, the first drive pin 11 and the second drive pin 12 are the second hook and the second hook, respectively. It corresponds to each of the protrusions 6, and no other correspondence is possible (4th
Figure). A grip 13 is provided on the opposite side of the body 1 where the needle storage magazine section 2 is located, and a switch 14 for turning on and off a connection circuit between a power source and the motor 8 is incorporated in the grip 13. In addition, a battery 15 as a power source is housed therein. The battery 15 is a secondary battery that can be taken out of the housing 1 and appropriately charged, and is fixed in the housing by a locking spring 15a and electrically. The connection is made. The switch 14 has a pressing portion exposed to the outside of the housing, and by pressing a trigger 16 which rotates around a fulcrum in response to a pressing operation, two long and short members which are a first operating member and a second operating member. The leaf springs 17 and 18 each having a substantially V-shape are operated. A control plate, which is a control member formed of a plate-like body having a spring property, which is regulated so as to be slidable in a moving direction of the hammer 3 in a groove formed in the housing 1, is provided on a side portion of the hammer 3. 19 is set, and the upper end of the control plate 19 serves as a hook 19a. Then, when a pressing force is applied to the tip catching portion 19a laterally, the whole bends,
Also, when the pressing force is released, the spring force returns to the posture parallel to the hammer 3 by itself, and the lower end portion thereof is a safety lever 19b projecting from the needle ejection port P, and the pushing down spring 19c is used. The tip of the safety lever 19b projects from the end of the needle ejection port. The long leaf spring 17 is normally in contact with the locking portion 19a at the tip of the control plate 19, and is pushed by the second drive pin 12 and bent laterally so that the contact is released. ing. On the other hand, the short plate panel 18 comes into contact with the turning lever 20 serving as a restricting member and the third hooking protrusion 7 and is turned immediately before the hammer 3 reaches the upper fulcrum, and the tip of the turning lever 20 is moved. When the switch is touched, it is pushed down in the direction opposite to the direction of contact with the switch.

Further, on the bottom surface of the needle storage magazine portion 2, a height is changed according to the hardness of the driving material so that the amount of driving the needle can be adjusted. An adjusting mechanism 21 is provided, and the driving depth adjusting mechanism 21 has a stud bolt 21a as shown in FIG.
To the knob nut 21b.
With the rotation of 1b, the knob nut 21b is moved in the axial direction of the stud bolt 21a by a screw feeding action, and the height can be adjusted. Further, the knob nut 21b is sandwiched on both sides by a pair of leaf springs 21c, and the two opposite side surfaces of the knob nut 21b are scraped off so that the leaf spring 21c and the flat portion of the knob nut 21b come into contact with each other. In such a state, a strong force is required to rotate the knob nut 21b, and resistance is generated every 180 degrees, so that the knob nut 21b does not rotate carelessly during the work and the height adjustment does not go wrong.

The electric tucker formed in this manner will be described from the state in which the hammer 3 stands by at the position immediately before the upper fulcrum (Figs. 6a and 7a). First, the needle ejection port P is pressed against the driving target to When the trigger 16 is pressed (hereinafter referred to as pulling the trigger) while the safety lever 19b protruding from the needle ejection port P is pushed in (Fig. 6b) (Fig. 6c), the rotary lever 20 is moved. The short leaf spring 18 is rotated by the third locking projection, and the short leaf spring 18 is in the second position while being pressed down.The short leaf spring 18 does not turn on the switch 14, but the tip of the long leaf spring 17 is the control plate. The switch 14 is turned on only by the long leaf spring 17 because it is in the operating position where it abuts on the front end hooking portion 19a of 19. As a result, the motor 8 rotates, the disk 10 rotates via the reduction mechanism 9, and the drive pins 11 and 12 projecting from the disk 10 move in a circular locus.

As a result, the second drive pin 12 slightly pushes up the second locking projection 6, the hammer 3 goes over the top dead center (FIGS. 6d and 7b), and the second drive pin 12 moves to the second hooking projection. When the hammer 3 is released from 6, the hammer 3 is accelerated by the elastic force of the coil spring 4 and moves so as to jump toward the needle ejection port P, and the needle N at the needle ejection port P is ejected by the driver 3a at the tip of the hammer 3. Yes (Fig. 6e, Fig. 7b). When the second drive pin 12 is disengaged from the second hooking protrusion 6 when the hammer 3 moves, the first drive pin 11 is slightly displaced from the second drive pin 12 by 180 degrees as described above. Since the phase difference is projected, the first drive pin 11 is not located on the movement locus of the second locking projection 6. When the second drive pin 12 is disengaged from the second hooking projection 6 and the hammer leaves the top dead center, the contact between the turning lever 20 and the third hooking projection 7 is cut off, and the turning lever 20 is a short plate. The spring 18 loses the force to push down the spring 18 and rotates, and the short leaf spring 18 moves to the first position and becomes the posture for turning on the switch 14 (Fig. 6d). As soon as the hammer 3 reaches the end position in the striking direction (hereinafter referred to as bottom dead center), the control plate 19 causes the second drive pin 12 to move.
It is urged to the side by means of which the abutment between the tip catching portion 19a of the control plate 19 and the tip of the long leaf spring 17 is released (7th step).
Figure c), the long leaf spring 17 moves to the free position and the switch 14
The pressing force for turning ON is lost. However, as described above, since the ON operation of the switch 14 is maintained only by the short leaf spring 18, the hammer 3 that has reached the bottom dead center will not move to the first drive pin.
11 contacts the first hooking protrusion 5, and the first hooking protrusion 5 is pushed up as the first drive pin 11 moves, and is pushed up to a height of about half of the entire stroke against the biasing force (7th).
Figure d). Then, the second drive pin 12 comes into contact with the second hooking protrusion 6, and the second hooking protrusion 6 is pushed up as the second drive pin 12 moves, while the first driving pin 11 moves to the first hooking protrusion 5.
The hammer 3 is pushed up against the biasing force until just before the top dead center. Then, the rotation lever 20 is rotated by the third hooking protrusion 7, the switch operation by the short leaf spring 18 is also released, and the motor 8 is stopped (Fig. 6e). When the finger is released from the trigger 16 here, the long leaf spring 17 slides the side surface of the control plate 19 to the tip position of the locking portion 19a, and the tip locking portion 19a.
Wait at the contact position with.

When the trigger 16 is pulled again, the long leaf spring 17 comes into contact with the tip locking portion 19a of the control plate 19 and the switch 14 is turned ON, completing the same needle striking as above, and the hammer 3 immediately before top dead center. Stop while waiting at.

Even if the trigger 16 is pulled without pushing in the safety lever 19b protruding from the needle ejection port P here,
The long leaf spring 17 does not contact the tip locking portion 19a of the control plate 19,
Since the switch 14 does not operate ON, the safety is high. By pulling the trigger 16 without pushing the safety lever 19b (Fig. 6g) and pushing the safety lever 19b in that state (Fig. 6h), The needle can be punched in the same manner as described above.

While the hammer 3 is being pushed back before the hammer 3 reaches the standby position at the end of pushing back, for example, when the hammer 3 is stopped in the state of FIG. 7d, it is because the trigger 16 is pulled instantaneously. The switch 14 is turned off and the moder 8 is stopped, but the tip of the long leaf spring 17 is in contact with the tip catching portion 19a of the control plate 19 (the long leaf spring 17 returns to the initial position by releasing the pressing of the trigger). Because)
If the trigger 16 is pulled again, the rest of the process and one stroke of the needle are continuously performed, and if the hammer 3 cannot be pushed back due to insufficient capacity of the battery 15, the trigger 14 is released to release the switch 14 Since it can be turned off, over discharge of the battery 15 can be prevented, and if the battery 15 is replaced and the trigger 16 is pulled again as described above, the long leaf spring 17 is returned to the initial position by releasing the pressing of the trigger. Therefore, the remaining steps and one nailing operation are continuously executed. Further, by the reverse rotation prevention by the ratchet pawl 9a, the hammer 3 in the middle of pushing back is not pushed down by the elastic force of the coil spring 4, and the energy loss is small.

The electric tucker of the present embodiment has a safety measure by a safety lever provided at the nail ejection port, but in addition to that, a stopper mechanism is provided to prevent the switch from being pulled unless it is released, and the reliability is further improved. It is desirable to choose one. Further, since the drive means is a mechanism that pushes the hammer back in two steps by the rotating first and second drive pins, a stroke that is twice the radius of rotation can be secured, and a reduction ratio is small and a small gear is used. It becomes possible to make it compact.

In the above description, the needle ejection direction is assumed to be right below in accordance with the drawings, and the expressions of the hammer top dead center, bottom dead center, and push up are used. The point means the side opposite to the direction in which the needle is launched, and is not necessarily the one in which the hammer moves up and down. Further, in the embodiment, the shape, size, etc. of the hammer, spring, driving means, switch, trigger, first and second actuating members, regulating member, control member are within the range in which the above-mentioned object of the present invention can be achieved. May be changed as appropriate.

Effect According to the present invention, the hammer is pushed back at the end position and the trigger is pulled once to ensure that the needle is hit only once. It has excellent workability as it is rich and does not hit twice. In addition, even if you encounter a situation that stops on the way, it is easy to deal with, there is no energy loss or adverse effect on the battery, high reliability, simple structure and cost reduction, especially when using a battery type The benefit is enormous.

[Brief description of drawings]

The drawings show an electric tucker according to the present invention.
FIG. 2 is an explanatory view showing an internal structure, FIG. 2 is an end view showing a positional relationship between a housing and a hammer and a control plate, FIG. 3 is an end view showing a reverse rotation preventing mechanism portion, and FIG. Exploded explanatory view showing the relationship with the switch, Fig. 5 is an end view of the driving depth adjusting mechanism, and Figs. 6 (a) to 6
Drawing (h) and Drawing 7 (a) -Drawing 7 (d) are operation explanatory views showing the relation between a drive pin and a hammer. 1 ... Housing, 1b ... Groove part, 2 ... Needle storage magazine part, 2 ... Hammer, 3a ... Driver, 4 ... Coil spring, 4a ... Guide member, 5 ... First hooking protrusion, 6 …
… Second latching protrusion, 7 …… Third latching protrusion, 8 …… Motor
9: Reduction mechanism, 9a: Ratchet pawl, 10: Disc, 11
...... First drive pin, 12 …… Second drive pin, 13 …… Grip, 14 …… Switch, 15 …… Battery, 16 …… Trigger, 17 …… Long leaf spring, 18 …… Short leaf spring, 19 ...... Control plate, 19a ...... Latch, 19b ...... Safety lever, 19c ......
Push-down spring, 20 …… Release plate, 21 …… Striking depth adjustment mechanism, 21a …… Stud bolt, 21b …… Knob nut,
21c: leaf spring, P: needle ejection port, N: needle

Claims (6)

[Claims] 1. A hammer for striking a needle, a spring for urging the hammer in the striking direction of the needle, and a rotation of a motor housed in a housing to push the hammer back in a direction opposite to the striking direction of the needle. Drive means for accumulating elastic force in the spring, and controlling means including the following a to e for pushing back the hammer and hitting the needle with the hammer accelerated by the elastic force of the spring from the push-back end position. Electric tucker equipped with: a, a switch that is fixed in the housing and turns ON / OFF the connection circuit between the power supply and the motor, b, the pressing part is exposed to the outside of the housing, and within a predetermined range corresponding to the pressing operation. A trigger for moving a switch, c, a first operation that is linked to the pressing operation of the trigger when the pressing operation of the trigger is performed and is brought into contact with the switch button of the switch to turn on the switch. And a second position that is in a non-contact state with the switch button and is in a non-contact state with which the switch is turned off. A restricting member that moves the first actuating member to the second position to prevent ON operation of the switch, e, a control member provided in the housing to control one hit of the hammer, f, pressing of the trigger When the hammer leaves the push-back end position, the switch is turned off when the hammer leaves the push-back end position, as well as connecting with the control member by operation and contacting the switch button of the switch to turn on the switch. A second actuating member movable between the actuating free position and the other, 2. The electric tucker according to claim 1, wherein the first actuating member is a leaf spring which is interposed between the trigger and the switch and is bent into a substantially V shape. 3. The rotating member is a rotating lever which is rotated by contact with a protrusion provided on a hammer and which moves the first actuating member to a second position at an edge thereof. Electric tucker. 4. The electric tacker according to claim 1, wherein the second actuating member is a leaf spring that is bent between the trigger and the switch and is bent into a substantially V shape. 5. The control member is a plate-like body having a spring property, in which the base end side is regulated in the housing and the tip end side is flexibly set. The bent end portion on the tip end side and the second actuating member are provided. The electric tucker according to claim 1, wherein the electric tacker is arranged so as to be detachable from the system. 6. A safety lever, wherein the control member is movably provided in a housing, and the safety lever is always elastically biased so that one end thereof protrudes from a nail ejection port of the housing, and the other. 2. The electric tucker according to claim 1, wherein the end faces the end of the second actuating member, and the pressing operation of the safety lever against the driven material and the pressing operation of the trigger work together to turn on the switch.