JPH07190687A - Method and apparatus for feeding ammunition of machine cannon - Google Patents

Abstract

PURPOSE:To lower a height of a machine cannon and to reduce its weight by releasing an elastic deformation of an elastic element when a bolt is moved rearward to be released from a slit and sequentially feeding ammunitions to a loading preparing positions. CONSTITUTION:An ammunition 3 received in a gun carriage is received by ammunition receiving recesses 18b, 18e of an ammunition feeding wheel 18. When a cam drum 13 in a state that a bolt 4 is engaged with a slit 18a of the wheel 18 is rotated, rotation of the wheel 18 is restricted with the bolt 4 to be engaged with the slit 18a used as a stopper, and an elastic element 20 is elastically deformed by the rotation of the drum 13. Then, when the bolt 4 is moved rearward and released from the slit 18a, the deformation of the element 20 is released to rotate the wheel 18 by one pitch corresponding to an interval of the slits 18a, and the ammunition 3 received by the recesses 18b, 18e of the wheel 18 is fed to a forward loading preparing position of the bolt 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ammunition feed method and apparatus for an cannon in which a breech bolt is driven by a cam drum.

[0002]

2. Description of the Related Art In a conventional machine gun of this type, as a means for sending ammunition from a feeder to a mount of the machine gun and then sending the ammunition to a pre-loading position in front of the breech bolt, a delivery wheel is used. Is widely used. This is because the delivery wheel is rational for ejecting the cartridge case as well as the delivery. The ammo wheel rotates intermittently with the rotation of the cam drum to rotate, so that one ammo that is received in the ammo receiving recess consisting of a notch is intermittently sent while the breech bolt is retracting and is retracting and stopping. . A Geneva mechanism, a roller cam gear, etc. are used for this intermittent motion mechanism. Further, the conventional bullet sending wheel is arranged above the cam drum, and a method of sending the ammunition sent from the ammunition machine to the front of the bottom of the playground is generally adopted.

[0003]

However, such a conventional method for feeding ammunition for a machine gun has the following technical problems. (1) Since the bullet sending wheel is arranged above the cam drum, the height of the machine gun increases and the weight also increases. That is, when the cannon is installed on the turret and used, the space required for the elevation of the cannon is large due to its high height. Therefore, it is necessary to increase the height of the turret ceiling, and the height of the turret is disadvantageous as a combat vehicle. In particular, when mounted on an aircraft for use, there is a demand to reduce both space and weight.

(2) The intermittent motion mechanism is constructed by transmitting the rotation of the shaft that drives the cam drum to, for example, the Geneva mechanism through a gear, a chain and the like. This is a relationship in which the cam drum and the blasting wheel are arranged with their central axes separated from each other, and the size of the machine gun in the longitudinal direction (front-back direction) is increased to accommodate the intermittent motion mechanism including these power transmission mechanisms. As a result, the weight is also increasing.

(3) While the breech hole moves forward and backward, it passes through the ammunition receiving recess of the blasting wheel. However, if the precision and rigidity of the intermittent motion mechanism including the power transmission mechanism are not sufficient, the breech hole and the blasting wheel are not necessary. Interfering with and getting damaged. This defect occurs even when the assembly and adjustment are inaccurate, which reduces reliability.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional technical problems.
The configuration of the invention of FIG.
A delivery wheel that has a play bottom 4 that is movably accommodated in the turret 2 so as to move back and forth in the direction of the central axis of the turret, and that intermittently rotates the ammunition 3 received in the turret 2 every one pitch. 1
A method for feeding ammunition of a machine gun which feeds to a loading preparation position in front of the breech bolt 4 by means of 8,
A plurality of slits 18a that extend forward from the rear end and serve as a passage for the playground 4 are provided, and ammunition receiving recesses 18d and 18e that receive the ammunition 3 are provided on the outer diameter side of each slit 18a. Arranged freely,
When the cam drum 13 rotates while the play bottom 4 is engaged with the slit 18a, the elastic body 20 is elastically deformed while the rotation of the feed wheel 18 is restrained by using the play bottom 4 engaged with the slit 18a as a stopper. Then, when the play bottom 4 moves rearward and disengages from the slit 18a, the elastic deformation of the elastic body 20 is released and the bullet sending wheel 1 is released.
8 is rotated by one pitch corresponding to the interval between the slits 18a, and the ammunition receiving concave portions 18d and 18e of the bullet feeding wheel 18 are rotated.
Is a method of feeding ammunition for a machine gun, characterized in that the ammunition 3 received in the above is sequentially fed to the loading preparation position. The structure of the invention of claim 2 is provided with a play bottom 4 movably accommodated in the turret 2 so as to move back and forth in the central axis direction of the barrel 1 by the rotation of the cam drum 13. A delivery wheel 18 for intermittently rotating the received ammunition 3 every pitch.
Is an ammunition feed device for a machine gun that feeds to the front of the playground 4 in a loading preparation position. The ammunition delivery device is arranged on the outer periphery of the cam drum 13 so as to be rotatable relative to the ammunition. And a plurality of slits 18a, each having an ammunition receiving recess 18d, 18e for receiving the ammunition 3 on the outer diameter side of each slit 18a,
Interlocking with the rotation of the cam drum 13, the breech bolt 4 is elastically deformed while engaging with the slit 18a and restraining the rotation of the feed wheel 18, and the breech bolt 4 moves rearward to engage with the slit 18a. And an intermittent motion mechanism having an elastic body 20 for releasing the elastic deformation when the gear is separated from each other, and rotating the feed wheel 18 by one pitch corresponding to the interval of the slit 18a. It is a feeder. In the configuration of the invention of claim 3, the intermittent motion mechanism is
A stop wheel 15 that is rotatably supported on the gun rack 2 by aligning the center axis with the cam drum 13, and the cam drum 1.
3 is movably supported in the front-rear direction, is elastically biased rearward, and is engaged with the engaged portion 15a of the stop wheel 15 and the engaging portion 16a; An annular shape having a deformable portion 11b which is formed and allows the rearward movement of the lock member 16 so that the engaging portion 16a engages with the engaging recess 15a to give the stop wheel 15 a rotation of substantially one pitch. 3. The ammunition feeding device for a machine gun according to claim 2, further comprising a cam surface 11 a of the above, and an elastic body 20 interposed between the stop wheel 15 and the shot sending wheel 18.

[0007]

According to the first aspect of the present invention, the ammunition 3 received in the gun rack 2 is provided with the ammunition receiving concave portion 18d,
Accept at 18e. Then, the playground 4 is the sending wheel 18
Cam drum 1 in a state of being engaged with the slit 18a of
At the time of rotation of 3, the rotation of the feed wheel 18 is restrained by using the free bottom 4 engaging with the slit 18a as a stopper, and the elastic body 20 is elastically deformed by the rotation of the cam drum 13. Then, when the breech bolt 4 moves rearward and disengages from the slit 18a serving as a passage path, the elastic deformation of the elastic body 20 is released, and the feed wheel 18 is moved to the slit 18a.
1 pitch corresponding to the interval of
The ammunition 3 received in the ammunition receiving concave portions 18d and 18e is sent to the loading preparation position in front of the playground 4.

According to the second aspect of the present invention, the ammunition 3 received in the gun rack 2 has the ammunition receiving concave portion 18 of the bullet feeding wheel 18.
Accept in d and 18e. Then, when the cam drum 13 rotates in a state in which the play bottom 4 is engaged with the slit 18a of the feed wheel 18, the play bottom 4 is engaged with the slit 18a.
Is used as a stopper to restrain the rotation of the bullet delivery wheel 18,
The rotation of the cam drum 13 elastically deforms the elastic body 20 via the intermittent motion mechanism. Next, when the breech bolt 4 moves rearward and disengages from the slit 18a serving as a passage, the elastic deformation of the elastic body 20 is released, and the feed wheel 18 is moved by one pitch corresponding to the interval of the slit 18a. The ammunition receiving concave portions 18d and 18e of the bullet feeding wheel 18 are rotated.
The ammunition 3 received in is sent to the loading preparation position in front of the breech bolt 4.

According to the third aspect of the invention, when the elastic body 20 is elastically deformed, the lock member 16 supported by the cam drum 13 so as to be movable back and forth is engaged with the deformed portion 11b of the annular cam surface 11a. When the lock member 16 is moved in the front-rear direction, the engaging portion 16a of the lock member 16 is engaged with the engaging recess 15a of the stop wheel 15.
And the rotation of the cam drum 13 is transmitted to the stop wheel 15. Since the deformable portion 11b is formed so as to give the stop wheel 15 a rotation of one pitch, the elastic body 20 interposed between the stop wheel 15 and the bullet feeding wheel 18 substantially has a pitch of one pitch. Elastic deformation is given. Next, when the breech bolt 4 moves rearward and disengages from the slit 18a serving as a passage, the elastic deformation of the elastic body 20 is released. It can be rotated by the pitch.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 9 show one embodiment of an ammunition feeding device for a machine gun according to the present invention. First, the essential parts of the machine gun will be described with reference to FIG. The machine gun has a gun rack 2 to which a barrel 1 is fixed, and a cam drum 13 that is rotationally driven by a rotary drive source 7 such as a motor advances, stops forward, retracts, and retracts in the direction of the central axis of the barrel 1. 1 to intermittently feed the ammunition 3 (3d) to the loading preparation position between the breech 4 and the barrel 1 so that the operation of the And a sending wheel 18.
As shown in FIGS. 1 and 3, the play bottom 4 is guided forward and backward by engaging the upper end portion with an engaging groove portion 2b formed in the upper portion of the gun rack 2.

The cam drum 13 has bearings 1 at both front and rear ends.
2 and 30 are rotatably supported on the side of the turret 2 and tooth portions 13b on the outer periphery of the rear end portion mesh with the gear 6 having a small diameter.
Is connected to the drive shaft 7a of the rotary drive source 7 by serration. The gear 6 is rotatably supported by a mount 5 and a bracket 11 fixed to the rear portion of the mount 2 via a bearing 5. In addition, an endless cam groove 13a is formed on the outer peripheral surface of the cam drum 13 to repeatedly give a series of operations of forward-forward stop-backward-backward stop to the play bottom 4. The cam groove 13a of the cam drum 13 has a lower end portion of the play bottom 4. The engaging projection 4a is engaged. The rear end portion of the cam groove 13a projects rearward from the exterior bullet sending wheel 18. Then,
The rotation of the drive shaft 7a of the rotary drive source 7 causes the cam drum 1 to rotate.
3 is decelerated and rotationally driven, and the unidirectional rotational drive of the cam drum 13 drives the play bottom 4 to perform the series of operations described above.

The delivery wheel 18 has a cylindrical shape with a bottom, and a plurality of slits 1 (eight in this embodiment) cut in the central axis direction so as to extend forward from the opening end located at the rear side.
8a are formed at a predetermined interval in the circumferential direction, and as shown in FIG. 4, the sending claws 18b are formed on the outer circumference between the slits 18a.
Are formed. Each slit 18a serves as a passage for the play bottom 4, and the width thereof has a size capable of receiving the upper portion of the engaging protrusion 4a of the play bottom 4, and the adjacent feed claw 18b is provided with each slit. The outer diameter side of 18a has an opposing surface shape capable of receiving the ammunition 3 and defines an ammunition receiving concave portion 18d. Further, as shown in FIGS. 1 and 5, an annular collar portion 18f forming a semi-circular ammunition receiving recess 18e facing the ammunition receiving recess 18d is also formed at the front end of the delivery wheel 18.
Are formed.

As shown in FIG. 1, a bottom portion of the delivery wheel 18 located on the front side is mounted on the gun rack 2 via a bearing 19.
1 and 3, the outer periphery of the rear end portion is rotatably supported by the ribs 2a of the gun rack 2 as shown in FIGS. It is rotatably supported on the outer peripheral surface of the cam drum 13 by the rotary sliding portion 18c. As shown in FIG. 3, a notch 2c is formed in the center of the upper portion of the rib 2a, and the engaging protrusion 4 of the play bottom 4 is formed.
The vicinity of a can pass through the notch 2c. Further, the bearing 12 for rotatably supporting the front end portion of the cam drum 13
Specifically, as shown in FIG. 1, it is interposed between the bullet feeding wheel 18 and the bullet feeding wheel 18.

An intermittent motion mechanism is arranged near the rear of the cam drum 13. The intermittent motion mechanism includes a slit 18a of the bullet sending wheel 18 and a stop wheel 15
The lock member 16, the torsion bar 20, and the cam surface 11a are main constituent elements. Stop wheel 15
Has a front end rotatably supported by a rear end of the cam drum 13 via a bearing 14 with its central axis aligned, and a rear end rotatably supported by the bracket 11 via a bearing 14. As shown in FIG. 6, a plurality of (8 in this embodiment) engaging recesses 15 are provided on the outer circumference of the large diameter portion of the stop wheel 15.
a is formed at predetermined intervals in the circumferential direction, and the circumferential width of the engaging recessed portion 15a, which is the engaged portion, is large enough to allow the protrusion 16a, which is the engaging portion of the lock member 16, to enter. .
The lock member 16 is slidably received back and forth on the outer peripheral portion of the rear end of the cam drum 13, and is biased rearward by a spring 17 so that the rear end surface of the lock member 16 and the cam surface 11 a formed to face the bracket 11. Always in contact. Bracket 11
Is an annular cam surface 1 that is fixed to the gun rack 2 as described above.
As shown in FIG. 7, the cam surface 11a has a flat portion 11c and a concave portion 11b which is a deformed portion having a predetermined length.

A torsion bar 20, which is an elastic body, is provided between the center of rotation of the bullet sending wheel 18 and the center of rotation of the stop wheel 15. Specifically, the torsion bar 20 has a front end portion serrated with the bottom center portion of the feed wheel 18, and a rear end portion of the stop wheel 1.
Serrated at the center of 5. Then, the torsion bar 20 is elastically deformed by the relative rotation between the feed wheel 18 and the stop wheel 15. Further, the pawl wheel 8 is fixed to the rear end portion of the stop wheel 15, and as shown in FIG.
A plurality of (8 in this embodiment) triangular claw portions 8a are formed at predetermined intervals on the outer periphery of the rear side surface.

Further, as shown in FIGS. 2 and 9, a pair of left and right lock pawls 22a and 22b which allow only one direction of rotation of the stop wheel 15 and the pawl wheel 8 are arranged at the lower portion of the gun rack 2. The lock claws 22a and 22b are attached to the gun rack 2
The intermediate portion is swingably supported by the shaft 23 between the cover 9 and the bracket 11 which are integrated with the claw wheel 22 and the opposing claw portions 22c and 22d at the upper end thereof are respectively supported by the springs 24 by the claw wheel 8. It is urged to engage with the claw portion 8a. Each spring 24 is supported by a guide pin 25, and the pair of guide pins 25 are attached to the bracket 1
It is sandwiched between the cover 1 and the cover 9 and horizontally projected on the left and right slidable slides 26. This slide 26
Can be locked at a moving position to the right or left by a locking mechanism (not shown), and one step portion 26a or 26b of the slide 26 abuts on the lower end portion of each locking claw 22a, 22b. The claw portion 22c or 22d and the claw portion 8a of the claw wheel 8 are disengageable from each other. FIG. 9 shows a state in which the slide 26 is moved to the right and locked, and in this state, the right side lock claw 22a is elastically pressed against the claw wheel 8 and the left side lock claw 22b.
Is held in a position away from the claw wheel 8 such that it cannot be engaged. In this state, the pawl wheel 8 can be rotated clockwise in the drawing, but the counterclockwise rotation is restricted by the right lock pawl 22a being locked to the pawl portion 8a. It Similarly, when the slide 26 moves to the left and is locked, the pawl wheel 8 can rotate only in the counterclockwise direction.

The relationship between the lock member 16 and the cam 11a will now be described. While the cam drum 13 rotates and the lock member 16 that rotates integrally with the cam drum 13 slides on the flat portion 11c of the cam 11a of the bracket 11 shown in FIG. 7, the spring 17 elastically compresses the lock member 16. Is pushed in, and the protrusion 16 of the lock member 16 is
In the state of “a”, the state of being released from the engaging recess 15 a of the stop wheel 15 is kept, and the rotation of the cam drum 13 is not transmitted to the stop wheel 15. Next, when the cam drum 13 rotates and the rear end of the lock member 16 reaches the position of the recess 11b, the lock member 16 is pushed backward by the elastic force of the spring 17, and the protrusion 16a engages with the stop wheel 15. The stop wheel 15 comes to rotate integrally with the cam drum 13 by engaging with the engaging recess 15a.
An elastic torsional deformation is applied to the torsion bar 20 coupled to the. When the cam drum 13 rotates further, the lock member 16
Re-engages with the flat portion 11c, the protrusion 16a is pulled out from the engaging recess 15a of the stop wheel 15, and the rotation of the cam drum 13 is not transmitted to the stop wheel 15.

However, the torsion angle of the torsion bar 20 provided by the stop wheel 15 is slightly smaller than the angle between the adjacent slits 18a of the bullet feeding wheel 18 (360 ° / 8 = 45 ° in this embodiment). It is a large angle (about 50 ° in this embodiment). The reason for ensuring a larger angle than the theoretically required torsional deformation angle (45 °) for the torsion bar 20 as this slightly larger angle (about 50 °) is that the projection 16a is separated from the engaging recess 15a of the stop wheel 15. After releasing, one lock claw 22
When the claw portions 22c or 22d of a and 22b are engaged with the claw portions 8a of the claw wheel 8 to maintain the torsionally deformed state of the torsion bar 20, the claw wheel 8 rotates and the torsion bar 2 is rotated.
It is in the place of compensating for the loosening angle of 0 torsional deformation.

At the time when the lock member 16 coincides with the position of the recess 11b, the play bottom 4 reaches the latter half of the backward stroke,
The torsion bar 20 has a predetermined twisting angle (about 5
0 °) can be given. Further, when the lock member 16 separates from the concave portion 11b and coincides with the position of the flat portion 11c, the claw portion 22 of one of the lock claws 22a and 22b thereafter is provided.
Since c or 22d engages with the claw portion 8a of the claw wheel 8 and maintains the torsionally deformed state of the torsion bar 20, it may be immediately after the torsion bar 20 is given a predetermined twisting angle (about 50 °). Then, immediately after the play bottom 4 retracts and disengages from the slit 18a of the bullet sending wheel 18, and the bullet sending wheel 18 is rotated by one pitch by the torsion bar 20, the lock member 16 is released from the recess 11b. The claw wheel 8 can be omitted if it is configured to move away to the flat portion 11c.

Next, the operation of the above embodiment will be described. Now, as shown in FIGS. 4 and 5, one feeder 21a
Ammo 3 (3b, 3c, 3d) from
It has been sent to the ammunition receiving recessed portions 18d and 18e of No. 8. Rotation of the cam drum 13 in one direction (clockwise direction in FIGS. 4 and 5) gives the playground 4 a forward movement, a forward movement stop, a backward movement, and a backward movement stop motion, and the forward movement of the playbed 4 causes the loading. The ammunition 3 (3d) that takes the preparation position is pushed into the barrel 1 and, while it is stopped forward,
The rear end is closed and the bullet is fired. The breech bolt 4'shown by the chain double-dashed line in FIG. Then, the closed state of the play bottom 4 is released, and the play bottom 4 shifts from the forward stop state to the reverse stroke.

When the cam drum 13 rotates and the play bottom 4 retreats, the lock member 16 also comes into contact with the flat portion 11c of the cam surface 11a to disengage the engagement recess 15a from the protrusion 16a. Rotates together with. When the cam drum 13 rotates, the upper portion of the engaging protrusion 4a of the play bottom 4 engages with the slit 18a, so that the play bottom 4 moves.
Since it functions as a stopper against rotation of 8, the sending wheel 18 does not rotate, and the torsion bar 20
The stop wheel 15 and the pawl wheel 8 that are connected by means of are also stopped. When the second half of the backward movement stroke of the play bottom 4 is reached, before the engaging protrusion 4a of the play bottom 4 comes out of the slit 18a, the rotation angle range of the cam drum 13 corresponding to the torsion angle of the torsion bar 20 is about 50 °. The rear end surface of the member 16 engages with the recess 11b. As a result, the elastic member of the spring 17 causes the lock member 16 to move backward, and the protrusion 16a of the lock member 16 engages with the engagement recess 15a. Thus, the stop wheel 15 starts rotating integrally with the cam drum 13 in a state where the play bottom 4 functions as a stopper against the rotation of the feed wheel 18.

In this way, the torsion bar 20 is elastically wound about 50 °. Torsion bar 20
When the lock is caught, the claw portion 2 of the one lock claw 22a
2c rides over one claw portion 8a of the claw wheel 8.
Next, since the rear end surface of the lock member 16 engages with the flat portion 11c at the end of the predetermined torsional deformation of the torsion bar 20, the protrusion 16a of the lock member 16 comes out of the engagement recess 15a of the stop wheel 15. The cam drum 13 rotates regardless of the stop wheel 15. At that time, the claw wheel 8 is slightly angled (about 5
Rotation of the torsion bar 20 in a direction in which the winding of the torsion bar 20 weakens, the claw portion 22c of the one lock claw 22a is locked to the claw portion 8a of the claw wheel 8, and the claw wheel 8 winds the torsion bar 20 by 45 °. The position is maintained as a closed state.

When the cam drum 13 is further rotated, the play bottom 4
Exits from the slit 18a of the bullet delivery wheel 18. As a result, the rotation of the claw wheel 8 is restrained by the claw portion 22c of the one lock claw 22a, and the sending bar 18 is rotated by one pitch by the torsion bar 20, and the ammunition of the sending wheel 18 is changed. The ammunition 3 (3c) received in the receiving recesses 18d and 18e is sent to the loading preparation position in front of the play bottom 4. At this time, the ammunition 3 (3c) received in the ammunition receiving recesses 18d and 18e is sent to the loading preparation position while being guided by the arc-shaped guide surface 2d of the gun rack 2 shown in FIG.

The ammunition feeder 21a (or 21b) is used for the ammunition 3 (3
Since a) is constantly pushed out toward the bullet feed wheel 18, as shown in FIG. 4 and FIG.
The ammunition 3 (3a) from 1a (or 21b) is pushed toward the ammunition receiving recesses 18d and 18e of the bullet delivery wheel 18. In this state, if the feed wheel 18 rotates one pitch, the ammunition 3 on the side of the ammunition machine 21a (or 21b) 3
Immediately after (3a), the ammunition receiving concave portion 1 of the delivery wheel 18
It is pushed into 8d and 18e and is ready to send. Further, since the bullet sending wheel 18 is rotated by one pitch, the next slit 18a is located on the moving path of the play bottom 4,
The forward movement of the breech bolt 4 is not obstructed by the feed wheel 18.

Then, the cam drum 13 rotates and the play bottom 4
Moves to a certain extent and stops backward, and then moves forward to enter the slit 18a of the feed wheel 18. Since the breech bolt 4 is guided by the slit 18a (and the engaging groove portion 2b), the breech bolt 4 is moved during the forward and backward movements within the slit 18a.
Does not interfere with the bullet sending claw 18b of the bullet sending wheel 18 or the brim portion 18f. Further, since the ammunition 3 (3d) is rapidly sent to the loading preparation position by the elastic force of the torsion bar 20, the breech bolt 4 can be moved to the forward movement stage only by slightly retracting and stopping. is there. The forward movement of the breech bolt 4 causes the ammunition 3 (3d) in the loading preparation position to move to the barrel 1.
Be pushed into. In this way, ammunition 3 (3c, 3
b, 3a) are sent to the loading position one after another and the barrel 1
Be pushed into.

Of course, the slide 26 is moved leftward in FIG. 9 to be locked, and the cam drum 13 is reversed by the rotary drive source 7 in a state where the pawl wheel 8 is allowed to rotate counterclockwise. By rotating in one direction, the ammunition receiving concave portion 18 of the bullet feeding wheel 18 from the other feeder 21b.
Ammunition 3 of different types pushed toward d, 18e
(3a) can be sent to the loading preparation position in front of the playground 4 by the same action.

[0027]

As can be understood from the above description,
According to the ammunition feeding method for the machine gun and the apparatus therefor according to the present invention, the following effects can be obtained. (1) Since the cam drum is inserted in the shot sending wheel and these are coaxially overlapped with each other, the height of the machine gun can be reduced. Specifically, the height can be reduced by about 25% as compared with the conventional cannon ammunition feeding method or apparatus having a cam drum and a bullet feeding wheel of a normal size. (2) An elastic body or other intermittent motion mechanism can be incorporated inside the conventional cam drum, which has been a dead space. Therefore, the inside of the cam drum is effectively used, and the dedicated space required for accommodating the intermittent motion mechanism including the conventional power transmission mechanism can be reduced. As a result, the length of the machine gun was shortened and the weight was reduced accordingly.

(3) Since the slit of the bullet sending wheel is positively used as a guide for the play bottom, the bullet sending wheel rotates during the forward movement and the backward movement of the play bottom within the slit, and the play bottom collides with the bullet sending wheel. I was able to solve the problem. Further, when the torsion bar is used as the elastic body, the intermittent rotation position of the bullet sending wheel is stabilized, and the interference between the bullet sending wheel and the breech when entering the slit of the bullet sending wheel is well resolved. (4) The bullet sending wheel is rapidly rotated by the elastic body in a short time when the play bottom takes the retracted position. For this reason, in order to send the bullets to the loading preparation position, conventionally, a period in which the cam drum makes 1/4 rotation is used as a time when the breech bolt is stopped to move backward, but this can be remarkably reduced. .
As a result, it is possible to secure a long rotation angle of the cam drum that can be used for advancing and retreating the breech bolt, that is, a long time.
Since the drive torque of the cam drum can be reduced and the drive speed of the breech bolt can be reduced, problems such as wear and seizure can be reduced and reliability can be improved.

(5) During the backward stroke, the breech bolt is first accelerated and moves backward at a certain speed, and then is forcibly decelerated. For this reason, the exercise energy conventionally used in the playground has been wasted. On the other hand, according to the present invention, the elastic body can be deformed during deceleration of the breech bolt to be used as a force for rotating the bullet feeding wheel, and thus the kinetic energy of the breech bolt is used for the bullet feeding action. become. As a result, the fluctuation of the torque that drives the cam drum is reduced, and the efficiency of the rotary drive source is also improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing a machine gun according to an embodiment of the present invention.

FIG. 2 is a sectional view showing an enlarged main part of the same.

FIG. 3 is a sectional view taken along line III-III of FIG.

FIG. 4 is a sectional view taken along line IV-IV of FIG.

FIG. 5 is a sectional view taken along line VV of FIG. 1.

6 is a sectional view taken along line VI-VI of FIG.

7 is a sectional view taken along line VII-VII of FIG.

8 is a sectional view taken along line VIII-VIII of FIG.

9 is a sectional view taken along line IX-IX of FIG. 1.

[Explanation of Codes] 1: Barrel, 2: Gun rack, 3 (3a, 3b, 3c, 3d):
Ammunition, 4: play bottom, 4a: engaging protrusion, 7: rotary drive source,
8: claw wheel, 8a: claw part, 11: bracket, 11
a: cam surface, 11b: recessed portion (deformed portion), 13: cam drum, 15: stop wheel, 15a: engaging recessed portion (engaged portion), 16: locking member, 16a: protruding portion (engaging portion), 18 : Sending wheel, 18a: Slit, 18
d, 18e: ammunition receiving concave portion, 20: torsion bar (elastic body), 21a, 21b: ammunition machine.

Claims (3)

[Claims] 1. A gun provided with a play bottom (4) movably accommodated in a gun rack (2) so as to move back and forth in the direction of the central axis of the barrel (1) by rotation of a cam drum (13). A method for feeding ammunition of a machine gun in which ammunition (3) received in the rack (2) is fed to a pre-loading position in front of the breech bolt (4) by means of a delivery wheel (18) which intermittently rotates every pitch. The slit (1) that extends from the rear end toward the front and serves as a passage for the play bottom (4) is formed on the outer periphery of the cam drum (13).
8a) and a plurality of ammunition receiving recesses (18d, 18e) for receiving the ammunition (3), each slit (18a).
When the cam drum (13) is rotated while the breech wheel (18) is relatively rotatably arranged on the outer diameter side of the cam drum (13) and is engaged with the slit (18a), the slit ( The elastic body (20) is elastically deformed while the rotation of the feed wheel (18) is restrained by using the play bottom (4) engaged with the slit (18a) as a stopper, and the play bottom (4) moves rearward. ) When disengaged from
The elastic deformation of the elastic body (20) is released so that the bullet sending wheel (18) corresponds to the interval of the slit (18a).
A method of feeding ammunition for a machine gun, which comprises rotating the pitch and feeding the ammunition (3) received in the ammunition receiving recesses (18d, 18e) of the delivery wheel (18) to the loading preparation position one after another. 2. A gun is provided with a play bottom (4) movably accommodated in the gun rack (2) so as to move back and forth in the direction of the central axis of the barrel (1) by the rotation of the cam drum (13). Ammunition feed device for a machine gun that feeds the ammunition (3) received in the rack (2) to a pre-loading position in front of the breech bolt (4) by means of an ammunition feed wheel (18) that intermittently rotates every pitch. That is, the cam drum (13) has a plurality of slits (18a) that are arranged so as to be relatively rotatable on the outer periphery of the cam drum, extend from the rear end toward the front, and serve as passage paths for the play bottom (4).
The feed wheel (18) having an ammo receiving recess (18d, 18e) for receiving the ammunition (3) on the outer diameter side of each slit (18a) and the cam drum (13) are interlocked with each other, and the breech hole (4) is the above Engage with the slit (18a) and elastically deform while restraining the rotation of the feed wheel (18),
When the breech bolt (4) moves rearward and disengages from the slit (18a), elastic deformation is released, and the feed wheel (18) is moved by one pitch corresponding to the interval of the slit (18a). An ammunition feeder for a machine gun, comprising: an intermittent motion mechanism having an elastic body (20) for rotation. 3. A stop wheel (15), which is rotatably supported by the gun rack (2) with a central axis aligned with the cam drum (13), and a cam drum (13) which is movable back and forth. It is supported and elastically biased rearward, and the engaged portion (15a) of the stop wheel (15)
A lock member (16) capable of engaging with the engaging portion (16a)
And the stop wheel (1) formed on the gun rack (2) side by engaging the engaging portion (16a) with the engaging recess (15a).
Deformation part (11b) that allows the rearward movement of the lock member (16) so as to give the rotation of 5) substantially one pitch.
And an annular cam surface (11a) having an elastic body (2
0) has a stop wheel (15) and a delivery wheel (1)
8) It is intervening between and 8)
Ammunition feeder for the machine gun.