JPH07139895A - Ammunition supplying and discharging device for machine gun - Google Patents

Abstract

PURPOSE:To provide an ammunition-supplying and discharging device for a machine gun which has a switching mechanism of a guide member having a simple structure and can be applied to the gun of a high shooting speed. CONSTITUTION:Guide members 18, 26 which can be disposed at an ammunition guiding position A for partitioning ammunition feeding bent passages 2e, 2f for guiding ammunitions 4R, 4L to be fed by an ammunition feeding wheel 6 and a cartridge case discharging position B for opening cartridge case discharge passages 2c, 2d to discharge cartridge cases 4c are oscillatorily provided at base ends of the passages 2c, 2d. An elastic element for elastically energizing the members 18, 26 to a neutral position C of intermediate of the positions A and B is provided, a switching cam 19c operated to dispose the one member 18 or 26 at the position A and the other member 26 or 18 at the position B is formed at a cam drum 19 in a predetermined length in a circumferential direction corresponding to the rotary angle of the drum 19 when at least the ammunitions 4R, 4L is intermittently supplied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ammunition supplying / discharging device for a machine gun.

[0002]

2. Description of the Related Art In a conventional machine gun, in order to continuously fire bullets, after ammunition is continuously supplied from a bullet feeder, the ammunition is loaded into the barrel, and the bullet is fired to fire the bullets. ,
It is necessary to repeat the cycle of pulling out the cartridge case remaining on the barrel and discharging it from the cannon to the outside. On the other hand, in current machine guns, two types of ammunition are generally fired by the same machine gun. In this case, it is general to provide a magazine for each type of ammunition and supply ammunition to the machine gun. There are various methods for driving the play bottom, but when the play bottom is driven by external power, there is a method using a cam drum.

Further, after the ammunition supplied from the ammunition machine is loaded into the barrel through the breech, the shell is closed and the bullet is fired, the cartridge case is pulled out from the barrel and discharged to the outside of the machine gun. The action of feeding the ammunition from the front of the playground and the action of discharging the ammunition are performed by the delivery wheel. In the case of the bullet sending method using a bullet sending wheel, there is a method of providing a bullet sending wheel for each bullet type and driving either one of the bullet sending wheels depending on the bullet type, but the structure becomes complicated. There are drawbacks.

As a method of solving this drawback, there is a method in which only one bullet feeding wheel is used and the bullet type to be bulleted is changed only by changing the rotation directions of the bullet feeding wheel and the cam drum. In this case, the two kinds of ammunition are supplied from the left and right sides of the machine gun, respectively, and are transferred by a sending wheel to a loading position in front of the breech, and after loading and firing by the breech,
The cartridge case is pulled out and released by the blasting wheel to the side opposite to the side where it was bombarded. It is most rational to set the discharging direction to the left or right diagonally downward because the ammunition is supplied from both the left and right sides. Therefore, in this method, on the left side of the machine gun, there is an ammunition passage from the left side, and below that, an ammunition case passage for ammunition from the right side. A cartridge case discharge passage is provided. For this reason,
For example, while the ammunition supplied from the left side is transferred to the loading position, the ammunition passes through the ammunition case passage from the right side. Then, during the transfer of the ammunition, the ammunition is sent by the rotational movement of the sending wheel, so that it receives a centrifugal force. Therefore, the ammunition is discharged from the cartridge case discharge passage.

There are the following methods for preventing the release of ammunition from the pod discharge passage. (1) When the direction of bullet feeding, that is, the type of bullet is changed, the guide member for guiding the ammunition so as to block the cartridge case discharge passage on the side to be amended is driven manually or by power and held at that position,
Prevent the release of ammunition and guide the ammunition. When the type of bullet is changed, the guide member on the opposite side is set to the guide position and held in the same manner. (2) The guide member is held by a spring force at a position to prevent the release of the ammunition to guide the ammunition at the time of sending the ammunition, while the ejection side of the cartridge case causes the spring force of the guide member by the ejection force of the cartridge case. It defeats and pushes open and the case is released.

[Problems to be Solved by the Invention]

However, the conventional artillery ammunition supply / discharge device has the following technical problems. (1) When the guide member is manually driven, one-step switching operation is always required when changing the type of ammunition, and the operation is complicated. On the other hand, when the guide member is driven by power, it is possible to automatically switch the cartridge case discharge passage at the same time as the bullet type is switched, but a separate drive source is required and the structure becomes complicated. (2) On the other hand, in the method of holding the guide member by the spring force, the centrifugal force acting on the ammunition during the bullet feeding increases as the firing speed (the number of bullets ejected per unit time) increases. A strong spring force is required to support this. Therefore, it is difficult to apply it to a high firing rate cannon.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional technical problems.
In the configuration of the invention, the breech plate 3 that is movably accommodated in the gun rack 2 so that the rotating cam drum 19 sequentially performs forward, backward, backward, and stop operations in the central axis direction of the barrel 1.
And a single bullet feeding wheel 6, 12 for intermittently supplying ammunition 4R, 4L between the breech bolt 3 and the barrel 1, and the bullet feeding wheels 6, 12 arranged on both left and right sides of the barrel 1. A pair of ammunition machines 22 and 2 for storing a plurality of ammunition 4R and 4L to be fed.
3 and the bullet feed wheels 6, 6
The cartridge casing discharge passages 2a and 2b reaching 12 are formed, and below the cartridge supply passages 2a and 2b, cartridge case discharge passages 2c and 2d for discharging the cartridge case 4c pulled out from the barrel 1 are formed, respectively, and the cam drum 19 And the sending wheel 6,
The rotation direction of 12 is changed, and one of the ammunition feeders 2
A cartridge ammunition supply / discharge device for supplying ammunition 4R, 4L from Nos. 2, 23 to the barrel 1, each cartridge case discharge passage 2c, 2d
At the base end of the shell, the shell case discharge passages 2c, 2d are swung toward the shell delivery wheels 6, 12 to close the shells.
The ammunition guide position A for partitioning the ammunition feed curved passages 2e, 2f capable of guiding the ammunition 4R, 4L sent at 2 around the ammunition delivery wheels 6, 12 and the respective cartridge case discharge passages 2c, 2d are opened, Guide members 18, 26 capable of taking a cartridge case discharge position B capable of discharging the cartridge case 4c delivered from the bullet delivery wheels 6, 12 are swingably provided, and each guide member 18, 26 is provided.
In the normal state, elastic bodies 7 and 8 for elastically biasing and taking a neutral position C intermediate between the ammunition guiding position A and the shell case discharging position B are provided, and one guide is provided on the cam drum 19. Ammunition guide position A from neutral position C to members 18, 26
A switching cam 19c that causes the other guide member 26, 18 to change from the neutral position C to the cartridge case discharge position B intermittently supplies the ammunition 4R, 4L at least by the delivery wheels 6, 12. An ammunition supply / discharge device for a machine gun, which is formed in a predetermined length in a circumferential direction in correspondence with a rotation angle of a cam drum 19. According to a second aspect of the present invention, the cam drum 19 is formed so as to correspond to the switching cam 19c, has a circumferential length that is equal to or greater than the circumferential length of the switching cam 19c, and is radially outward of the switching cam 19c. The ammunition support cam 19 that projects the ammunition 4R, 4L until the tip ends of the ammunition 4R, 4L are fed to the barrel 1.
2. The ammunition supply / discharge device for a machine gun according to claim 1, further comprising b. According to a third aspect of the present invention, there is provided a bullet type switching plate 10 that opens either one of the pair of bullet feed passages 2a and 2b and closes the other. It is an ammunition supply / discharge device.

[0008]

According to the first aspect of the invention, the single feed wheels 6 and 12 are rotationally driven in one direction, and the ammunition 4L or 4R from the one ammunition machine 22 or 23 is supplied to the ammunition passage 2a or 2b. Through the feed wheels 6 and 12. When the breech bolt 3 moves forward, stops, and retreats in sequence, and the retracting stop stroke is taken, the cartridge pod 4c is pulled out from the barrel 1 by the breech bolt 3. Immediately after the play bottom 3 takes the reverse stop stroke, if the feed wheels 6, 12 start to rotate, the switching cam 19c contacts one guide member 18 or 26 that takes the neutral position C,
One of the guide members 18 or 26 is the sending wheel 6, 12
Is moved toward the ammunition guide position A by swinging toward the ammunition, the ammunition feed passages 6e and 2f are defined around the ammunition delivery wheels 6 and 12, and the ammunition 4L or 4R held by the ammunition delivery wheels 6 and 12 Is guided so as not to fall into the cartridge case discharge passage 2c or 2d.

Next, when the cam drum 19 rotates, the ammunition 4L or 4R forms the ammunition feed path A or 2f by taking the ammunition guide position A by the rotation of the interlocking feed wheels 6 and 12. While moving while being guided by the guide member 18 or 26, the other guide member 26 or 1
8 contacts the switching cam 19c and is pushed up from the neutral position C to form a space capable of receiving the cartridge case 4c held by the feed wheels 6 and 12. Further, when the cam drum 19 rotates, the ammunition 4L or 4R held by the bullet feeding wheels 6 and 12 by the rotation of the bullet feeding wheels 6 and 12 that interlock with each other.
Is sent to the front of the breech bolt 3, and in this state, the breech bolt 3 takes the forward stroke to load the ammunition 4L or 4R into the barrel 1, and after the breech bolt 3 is closed by the barrel 1, the forward stop stroke is taken and the bullet Fire.

After the rotation of the feed wheels 6 and 12, one guide member 18 or 26 is separated from the switching cam 19c and is elastically returned to the neutral position C by being urged by the elastic bodies (7, 8). . Then, the other guide member 26 or 18
Moves away from the switching cam 19c and is elastically returned to the neutral position C by being urged by the elastic bodies (7, 8). Then, after the breech hole 3 is released from the barrel 1, the breech hole 3 shifts to the retreat stroke, and immediately after the breech hole 3 reaches the retreat stop position, the feed wheels 6, 12 start rotating again.

According to the invention of claim 2, the switching cam 19
c is in contact with one guide member 18 or 26 having the neutral position C, and the bullet feed curved passage 2f is provided around the bullet feed wheels 6 and 12.
Or, almost simultaneously with partitioning 2e, the ammunition support cam 19
Since b is rotationally moved, support of the lower portion of the ammunition 4R is started, and the lower portion of the ammunition 4R is continuously supported until the ammunition 4R is pushed by the play bottom 3 and the tip is supported by the barrel 1.

According to the invention of claim 3, the bullet type switching plate 10
By this switching, the ammunition 4L, 4R fed to the bullet feeding wheels 6, 12 is formed by either one of the pair of ammunition feeders 22, 23.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 7 show an embodiment of an ammunition supplying / discharging device for a machine gun according to the present invention. First, the essential parts of the machine gun will be described with reference to FIGS. The machine gun has a turret 2 to which the turret 1 is fixed, and is slid onto the turret 2 so that the drive mechanism 72 sequentially advances, stops, retracts, and stops in the central axis direction of the barrel 1. A play bottom 3 that is movably accommodated,
Bombing wheels 6 and 12 of the same shape for intermittently supplying ammunition 4R or 4L between the breech bolt 3 and the barrel 1 (loading preparation position).
And a pair of ammunition feeders 22 and 23, which are arranged on the sides of the delivery wheels 6 and 12 so as to be connected to the gun rack 2 and store a plurality of ammunition 4R or 4L, respectively. Each of the ammunition feeders 22 and 23 has a well-known structure, and usually stores different types of ammunition 4R and 4L, and the ammunition 4R and 4L are sent to the delivery wheels 6 and 1 by a motor and a spring motor (not shown).
It is pressing toward 2. The ammunition 4R, 4L of each of the ammunition feeders 22, 23 is fed to the single bullet feed wheel 6, 12 via the bullet feed passages 2a, 2b.

As shown in FIG. 1, the center axes 13 of the bullet feeding wheels 6 and 12 are rotatably supported by the gun rack 2 via bearings 5, and an intermittent interlocking mechanism 14 interlocks with the rotation of the cam drum 19. Performs intermittent rotary motion. Further, the bullet feed wheels 6 and 12 have four notches 6a and 12a at predetermined intervals in the circumferential direction, and as shown in FIGS.
2 and 23 through the bullet feed passages 2a and 2b and the respective cutout portions 6
ammunition 4L or 4R sent to a, 12a
It is sent intermittently between the gun and the barrel 1. That is, when the play bottom 3 takes the retracted position, the bullet feed wheels 6 and 12 rotate 1/4 rotation, that is, one pitch, by the intermittent interlocking mechanism 14, and feed the ammunition 4L or 4R to the front side of the play bottom 3 so that the play bottom 3 moves. It is stopped when taking the forward position. As can be seen from FIG. 2, the cutout portions 6 of the delivery wheels 6 and 12 are
The a and 12a are shaped and dimensioned so that the play bottom 3 can pass through, and the play bottom 3 can be moved forward or backward without hindrance while the feed wheels 6 and 12 are stopped.

As shown in FIG. 1, a support shaft 16 of the cam drum 19 is rotatably supported by a gun rack 2 via a bearing 17, and is connected to an external power source such as a motor to rotate by receiving a rotational force. Reference numerals 15 and 20 are bearing retainers. A cam groove 19a is formed on the outer peripheral surface of the cam drum 19 to repeatedly give a series of forward-stop-backward-stop operations to the playground 3. The cam groove 19a of the cam drum 19 is provided with the engagement protrusion 3a of the playground 3 and the bearing 21. It is intervening and engaged. Then, by rotating the cam drum 19 in one direction, the play bottom 3
Are driven to perform the above series of operations. A drive mechanism 72 for driving the playground 3 is configured by the cam drum 19, the motor, and the like.

The delivery wheels 6 and 12 are located above the cam drum 19 of the gun mount 2 and below the supply paths 2a and 2b.
As shown in FIGS. 2 and 3, cartridge case discharge passages 2c and 2d are formed on both left and right sides of the cartridge. Each cartridge case discharge passage 2c, 2
d is a downward slope from the central axis of the barrel 1 toward the left and right sides so that the cartridge case 4c can roll under its own weight, and the upper edge of the ammunition support cam 19b whose upper end portion will be described later is shown in FIG. Partition walls 2g and 2h of the gun rack 2 that have an arc shape that substantially matches
It is divided by. The partition walls 2g and 2h have a groove for receiving a roller 25, which will be described later.
The play bottom 3 is slidably guided back and forth between g and 2h.
Further, guide members 18 and 26 are provided at the base ends of the cartridge case discharge passages 2c and 2d so as to divide the bullet feed curved passages 2e and 2f around the lower portions of the feed wheels 6 and 12, respectively.

Each of the guide members 18 and 26 has a curved plate shape, and the upper end portions thereof are supported by the gun rack 2 by a support shaft 11 so as to be swingable in the left and right directions, respectively, and the torsion springs shown in FIG. It is urged at 7 and 8 to elastically assume the neutral position C. The neutral position C of each of the guide members 18, 26
Is the delivery wheel 6, 1 as shown by the alternate long and short dash line in FIG.
It is an intermediate position between the ammunition guide position A swung toward 2 and the shell case discharge position B swung toward the outside in the left-right direction as shown by the chain double-dashed line, and is rotated to the lower end of each guide member 18, 26. This is a position where the pair of rollers 25 freely attached can be engaged with the switching cam 19c described later. The torsion springs 7 and 8 are
Each guide member 18, 26 has a relatively weak elastic force capable of causing the neutral position C to be taken in the unloaded state, and each guide member 18, 26 taking the neutral position C causes the rotating delivery wheel 6, 6.
When pressed by the cartridge case 4c sent from 12,
Each guide member 18, 26 can swing to the outside in the left-right direction to take the cartridge case discharging position B. Instead of the torsion springs 7 and 8, it is possible to use leaf springs or other spring members or elastic rubber.

In this way, each cartridge case discharge passage 2c, 2
The guide members 18, 26 are swingably provided at the base end portion of d,
In the normal state, each guide member 18, 26 is in the ammunition guide position A
A neutral position C intermediate between the shell case discharging position B and the shell case discharging position B is elastically biased by the torsion springs 7 and 8 to be taken. Ammo guide position A
Is capable of guiding the ammunition 4L, 4R fed by the bullet feeding wheels 6, 12 by swinging the guide members 18, 26 toward the bullet feeding wheels 6, 12 to close the respective cartridge case discharge passages 2c, 2d. It is a position that divides the bullet feed curved passages 2e, 2f around the lower portions of the bullet feeding wheels 6, 12, and the cartridge case discharge position B opens each cartridge case discharge passage 2c, 2d as shown in FIG.
This is a position where the cartridge case 4c delivered from the delivery wheels 6 and 12 can be discharged.

The cam drum 19 has at least a switching cam 19c for swinging the guide members 18, 26 so that the guide members 18, 26 can take the ammunition guiding position A or the cartridge case discharging position B. Bullet wheel 6,
By means of 12, a predetermined length is formed in the circumferential direction corresponding to the rotation angle of the cam drum 19 when the ammunition 4R, 4L is intermittently supplied. A pair of switching cams 19c are formed in front and rear in the direction of the central axis of the barrel 1. For example, as shown in FIG. 3, when the cam drum 19 rotates in one direction (counterclockwise direction), the front and rear ends of one guide member 26. And pushes up a pair of rollers 25 provided on the guide member 26 to rotate the guide member 26 in the clockwise direction so that the ammunition guide position A is set.
Ammunition 4R that divides the bullet feed curved passage 2f around 12 and is received in the notch portions 6a, 12a of the bullet feeding wheels 6, 12
Guides so as not to fall into the cartridge case discharge passage 2d, and further, the pair of rollers 2 provided at the front and rear ends of the other guide member 18.
5, the guide member 18 is rotated in the clockwise direction as shown in FIG. 4 to form a relatively large space around the lower left part of the delivery wheels 6 and 12 for receiving the cartridge case 4c. On the contrary, the cam drum 19 is in the other direction (clockwise direction).
In the state of rotating to the forward direction, the other guide member 18 is rotated in the counterclockwise direction to take the ammunition guiding position A, and the bullet feed curved passage 2e is defined around the bullet feeding wheels 6 and 12 to feed the bullet. The ammunition 4L received in the notches 6a and 12a of the wheels 6 and 12 is guided so as not to fall into the cartridge case discharge passage 2c, and the pair of rollers 25 provided at the front and rear ends of the other guide member 26 are pushed up to guide the ammunition. The member 26 is rotated counterclockwise to form a relatively large space around the lower right portion of the feed wheels 6 and 12 that can receive the cartridge case 4c.

In the present embodiment, the switching cam 19c
Is engaged with one roller 25 at a position M immediately before starting the intermittent supply of the ammunition 4R, 4L by the delivery wheels 6, 12, that is, immediately before the start of the backward stopping stroke c of the play bottom 3 shown in FIG. , Then engage the other roller 25,
A predetermined length is formed in the circumferential direction in correspondence with the rotation angle of the cam drum 19 so that the engagement with the other roller 25 is released immediately after passing through the firing P during the forward stop stroke a of the play bottom 3.

Further, as shown in FIG. 1, a pair of ammunition support cams 19b are formed on the cam drum 19 side by side on the front and rear sides of the switching cam 19c. Ammunition support cam 19b
After the ammunition 4R or 4L has been loaded into the loading position,
Ammunition 4 until it is pushed by the breech bolt 3 and the tip is supported by the barrel 1.
It supports the lower part of R or 4L, and functions to escape from the passage of the playground 3 when the playground 3 advances as the cam drum 19 rotates. Therefore, the ammunition support cam 19b has a circumferential length equal to or greater than the circumferential length of the switching cam 19c in a state of being located outside the switching cam 19c in the front-rear direction and preventing interference with the roller 25, and It projects radially outward from the switching cam 19c. And each guide member 18,
In a state in which the rollers 26 are biased by the torsion springs 7 and 8 respectively and returned to the neutral position C, the roller 25 moves to the cam drum 1
It is located outside the outer peripheral surface of 9 and inside the outer diameter surface of the switching cam 19c. Of course, ammunition support cam 19b
The switching cam 19c is provided in the cam groove 19 of the cam drum 19.
It is formed avoiding a.

Further, at the upper end of the gun rack 2, the ammunition type switching plate 1
Equipped with 0. As shown in FIGS. 1 and 2, the ammunition type switching plate 10 is movably guided to the left and right in the opening 2i of the gun rack 2, and the upper end portion protruding from the gun rack 2 is rotatably supported by the gun rack 2. The screw shaft 9 is screwed. As shown in FIG. 2, engaging portions 10a and 10b are provided in a projecting manner on the left and right sides of the front and rear positions of the lower end portion of the bullet type switching plate 10, respectively.
Between the a and 10b, the central axis 13 of the delivery wheels 6 and 12
Accepts. Then, by the forward / reverse driving of the motor 24 including the speed reducer connected to the screw shaft 9, the bullet type switching plate 10
Moves to the left and right in Figs.
The position on the second side, the position on the other side of the feeder 23, or the neutral position can be adopted.

As shown in FIG. 3, if the ammunition type switching plate 10 is on the side of the one ammunition machine 22, the ammunition 4R from the other ammunition machine 23 can be received in the notches 6a and 12a. Further, if the bullet type switching plate 10 is on the side of the other ammunition feeder 23, it is possible to feed the ammunition 4L from one ammunition feeder 22. By switching the ammunition type switching plate 10 as described above, it is determined which ammunition 4R or 4L of the pair of ammunition feeders 22 and 23 is fed to the bullet feeding wheels 6 and 12. Bullet type switching plate 10
When the neutral position is taken, neither of the ammunition 4R, 4L can be received by the cutout portions 6a, 12a of the delivery wheels 6, 12 and the shooting is automatically stopped.

If the ammunition 4R or 4L is already accommodated in the notches 6a and 12a when the ammunition type switching plate 10 is moved to the left or right, the ammunition 4R or 4L is stored.
Is a bullet feeder 22 or 23 depending on the bullet type switching plate 10.
Pushed back to the side. Thus, the bullet delivery wheels 6 and 12 rotate without hindrance, and when the empty notches 6a and 12a rotate to the bullet feed passage 2b or 2a connected to the other bullet feeder 23 or 22, the bullet is fed. It When the bullets 6 and 12 are rotated from one bullet feeder 22, the rotation direction is counterclockwise when viewed from the rear, and when the other bullet feeder 23 is used, the rotation direction of FIG. , The rotation direction is switched so as to be clockwise as shown in FIG. This prevents the ammunition 4R, 4L housed in the notches 6a, 12a from interfering with the ammunition type switching plate 10 and being unable to be fed between the breech block 3 and the barrel 1.

Next, the operation of the above embodiment will be described. When firing a machine gun, first, the motor 24 is driven to move the bullet type switching plate 10 to the left or right, and the bullet feeder 22 or 23 is switched. Now, it is assumed that the bullet type switching plate 10 is moving to the left as shown. If the bullet feed wheels 6 and 12 are driven to rotate clockwise in this state, the ammunition 4R from the other bullet feeder 23 passes through the bullet feed passage 2b and is pushed into the notches 6a and 12a in the empty state. . When the breech bolt 3 sequentially moves forward, stops, and retreats, and the retracting stop step c shown in FIG. 7 is taken, the cartridge case 4c is pulled out from the barrel 1 by the breech bolt 3.

FIG. 3 shows a state immediately after the play bottom 3 has taken the reverse stop stroke c and just before the feed wheels 6 and 12 start to rotate. The other guide member 26 in which the switching cam 19c takes the neutral position C is shown. The other guide member 26 is oscillated and driven toward the bullet feed wheels 6 and 12 to move to the ammunition guide position A, and the bullet feed curved passage 2f is defined around the bullet feed wheels 6 and 12. However, the ammunition 4R held in the notches 6a and 12a is guided so as not to drop into the cartridge case discharge passage 2d shown in FIG. One guide member 18
Is not in contact with the switching cam 19c yet and is in the neutral position C.
As it is, the ammunition support cam 19b rotates and starts supporting the lower portion of the ammunition 4R. From this state, the feed wheels 6 and 12 start rotating.

As shown in FIG. 4, the cam drum 19 (see FIG.
45 ° from the position shown in FIG. 2A, the ammunition 4R held in the notches 6a, 12a by the rotation of the interlocking feed wheels 6, 12 takes the ammunition guide position A and the ammunition feed curved path 2f. While being firmly guided by the guide member 26 that forms the guide member 18, one guide member 18 contacts the switching cam 19c and is pushed up from the neutral position C, so that the cartridge case 4c held in the notches 6a and 12a is removed. Form an acceptable space. Further, when the cam drum 19 rotates as shown in FIG. 5 (45 ° from the position shown in FIG. 4), the cutout portion 6 is formed by the rotation of the interlocking feed wheels 6 and 12.
The ammunition 4R held by a and 12a is fed to the front of the breech bolt 3 and supported by the ammunition support cam 19b. In this state, the breech bolt 3 takes the forward travel distance d and loads the ammunition 4R onto the barrel 1. The ammunition support cam 19b continues to support the lower part of the ammunition 4R until the ammunition 4R is pushed by the play bottom 3 and the tip is supported by the barrel 1. Then, after the play bottom 3 is closed by the barrel 1, the forward stop stroke a is taken and the bullet is fired (point P shown in FIG. 6). When the cartridge case 4c held in the notches 6a and 12a is present, the cartridge case 4c pushes up one guide member 18 to take the cartridge case discharge position B and is discharged from the cartridge case discharge passage 2c. In addition, although two cartridge casings 4c are shown in FIG. 5, normally, as shown in FIG.
The cartridge case 4c that is discharged by receiving the centrifugal force from 2a is discharged by rolling the cartridge case discharge passage 2c by its own weight while pushing up the guide member 18.

Immediately thereafter, the roller 25 of the guide member 26 separates from the switching cam 19c, and is biased by the torsion springs 7 and 8 to elastically return to the neutral position C. Then, the roller 25 of the guide member 18 separates from the switching cam 19c, and is biased by the torsion springs 7 and 8 to elastically return to the neutral position C. In addition, the ammunition support cam 19b also has a delivery wheel 6,
Take a position away from 12. Next, the barrel 1 to the playground 3
Is released, the breech bolt 3 moves to the backward stroke b, and the breech bolt 3
Immediately after the retreat stop position was adopted,
Starts rotating again. During such a series of operations of the play bottom 3, the ammunition 4L from the other ammunition machine 22 is prevented from moving at the engaging portion 10a of the ammunition type switching plate 10 and inhibits the rotation of the bullet feeding wheels 6 and 12. It is in a position not to.

By the way, when the firing speed of the machine gun is high and the centrifugal force pushing out the cartridge case 4c is large, the cartridge case 4c strongly pushes the guide member 18, and the cartridge case discharge passage 2c descends from the central axis of the barrel 1 toward the left side. In addition to being inclined, the cartridge case 4c is discharged from the cartridge case discharge passage 2c while rolling due to its own weight. On the other hand, when the firing speed of the machine gun is very low, the force of pushing the cartridge case 4c by the delivery wheels 6 and 12 is small. In this case, the guide member 18 may not be pushed open by the cartridge case 4c. In this case, one cartridge case 4c is stopped by the guide member 18 as shown in FIG.
9 is rotated once and the next cartridge case 4c is ejected, the cartridge case 4 is pushed by the delivery wheels 6 and 12, and as shown in FIG.
c is subsequently released. In this way, the ammunition 4R is successively supplied to the barrel 1 and the shooting is continued.

Even when the ammunition type switching plate 10 moves to the right and the cam drum 19 rotates in the clockwise direction, one guide member 18 similarly forms the bullet feed curved passage 2e and the ammunition 4L.
And the other guide member 26 is held in a state in which it can freely swing outwards to take the cartridge case discharging position B, and therefore the cartridge case 4c is discharged from the cartridge case discharging passage 2d.

When the rotation direction of the cam drum 19 is changed, one of the guide members 18 and 26 is located on the guide side of the ammunition 4R and 4L, regardless of the position of the cam drum 19.
The other is kept at a position where the cartridge case 4c can be discharged. As described above, neither of the guide members 18 and 26 is on the guide side of the ammunition 4R and 4L, so that the jamming (sticking phenomenon) by the discharged cartridge 4c does not occur. The reason is that when the type of ammunition is changed, that is, when the rotation direction of the cam drum 19 is changed, (1) both of the guide members 18 and 26 are changed to the change cam 19
When it is separated from c, one guide member 18 or 26 is in the guide side and the other guide member 26 or 18 is in the discharging state due to the rotation of the cam drum 19. (2) One guide member 18 or 26 is the switching cam 19
When riding on c, the same as above (1). (3) Even when both the guide members 18 and 26 are mounted on the switching cam 19c as shown in FIG. 4, the center of the support shaft 11 on the side where the cartridge case 4c is discharged and the center of the support shaft 16 of the cam drum 19 are formed. Since the contact point between the roller 25 of the guide member 18 and the switching cam 19c is located on the outer side in the rotation direction than the line connecting the and, the guide member 18 is retained even when the rotation direction of the cam drum 19 changes. Is kept in this position. Therefore, jamming does not occur. Of course, the notch portions 6a, 12 are rotated slightly (about 45 °) in the counterclockwise direction from the state shown in FIG.
The ammunition 4R received in a is returned to the position of the bullet feed passage 2b, the cartridge case 4c is pushed out by its own weight or the tip of the bullet feed wheels 6 and 12, and then the ammunition type switching plate 10 is switched.

[0032]

As can be understood from the above description,
According to the ammunition supply / discharge device for a machine gun of the present invention, the following effects can be obtained. (1) Since the guide member is held at the position where the guide surface is surely formed by the cam drum, the ammunition is not discharged from the cartridge case discharge hole even at a high firing speed. As a result, it has become possible to apply it to high-speed machine guns. (2) The guide member is automatically switched to guide the ammunition by changing the type of ammunition, that is, changing the rotation direction of the cam drum. For this reason, a separate operation for switching the position of the guide member and a drive mechanism therefor are not required in accordance with the change of the bullet type. As a result, the guide member switching structure is simplified.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a main part of a machine gun according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

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

FIG. 4 is a similar operation explanatory diagram.

FIG. 5 is an explanatory view of the same operation.

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

FIG. 7 is a diagram showing the relationship between the rotation of the cam drum and the displacement of the play bottom.

[Explanation of symbols]

1: barrel, 2: gun rack, 2a, 2b: bullet feed passage, 2c, 2
d: cartridge case discharge passage, 2e, 2f: bullet feed curved passageway, 3: play bottom, 3a: engaging protrusion ,: 4c: cartridge case, 4R, 4L: ammunition, 6,12: delivery wheel, 6a, 12a: notch Part, 7, 8: torsion spring (elastic body), 9: screw shaft, 1
0: bullet type switching plate, 10a: elongated hole, 13: central axis, 18,
26: guide member, 19: cam drum, 19a: cam groove, 19b: ammunition support cam, 19c: switching cam, 2
2, 23: ammunition feeder, A: ammunition guide position, B: shell case discharge position, C: neutral position.

Claims (3)

[Claims] 1. A rotatable cam drum (19) is movably accommodated in a gun mount (2) so as to sequentially advance, stop, retract and stop in the direction of the central axis of the barrel (1). Barrel (1) with a breech bolt (3), a single delivery wheel (6, 12) for intermittently supplying ammunition (4R, 4L) between the breech bolt (3) and the barrel (1) The ammunition (4) placed on both the left and right sides of the
R, 4L) A pair of ammo (22, 2)
3) and bullet feed passages (2a, 2b) from the bullet feed machines (22, 23) to the bullet feed wheels (6, 12) are formed, and the bullet feed passages (2a, 2b) are formed. The cartridge case discharge passages (2c, 2d) for discharging the cartridge case (4c) pulled out from the barrel (1) are respectively formed under the barrel, and the rotation directions of the cam drum (19) and the delivery wheel (6, 12) are changed. Then, one of the ammunition supply machines (22, 23)
An ammunition supply / discharge device for a machine gun that supplies ammunition (4R, 4L) from the shell to the barrel (1), each of the shell case discharge passages (2c, 2)
At the base end of d), the ammunition (6, 12) is swung toward the ammunition delivery wheel (6, 12) to close the respective cartridge case discharge passages (2c, 2d), and the ammunition (6 4R, 4L) and ammunition guide position (A) for partitioning the bullet feed curved passages (2e, 2f) around the feed wheel (6, 12),
A guide member (18, 26) that can take a cartridge case discharge position (B) that allows each cartridge case discharge passage (2c, 2d) to be opened to discharge the cartridge case (4c) sent from the bullet sending wheel (6, 12). ) Respectively, and each guide member (18, 26) is elastic at a neutral position (C) intermediate between the ammunition guide position (A) and the shell case discharge position (B) in a normal state. An elastic body (7, 8) for urging the guide member (18, 26) is provided, and one guide member (18, 26) is made to take the ammunition guide position (A) from the neutral position (C), and the other guide member (26, 18). A switching cam (19c) that allows the shell case discharge position (B) to be taken from the neutral position (C) to the ammunition (4R, 4L) at least by the delivery wheel (6, 12).
The predetermined length in the circumferential direction corresponding to the rotation angle of the cam drum (19) when intermittently supplying
An ammunition supply / discharge device for a machine gun, characterized in that it is formed in 9). 2. A cam drum (19) formed corresponding to the switching cam (19c), having a circumferential length equal to or greater than the circumferential length of the switching cam (19c), and from the switching cam (19c). Also protrudes radially outward, and ammunition (4R,
The ammunition supply / discharge device for a machine gun according to claim 1, further comprising an ammunition support cam (19b) for supporting the ammunition (4R, 4L) until the tip of the (4L) is fed to the barrel (1). 3. A machine gun according to claim 1, further comprising a bullet type switching plate (10) for opening one of the pair of bullet feed passages (2a, 2b) and closing the other. Ammunition supply and discharge device.