Injection apparatus and method of manufacturing resin body

1 . An injection apparatus, comprising:

an injection nozzle configured to inject a resin;

an injection cylinder configured to store the resin to be supplied to the injection nozzle;

an injection plunger configured to press the resin stored in the injection cylinder;

a movable unit, configured to move the injection plunger, including a moving member and a ball screw including a screw shaft, the moving member being configured to move in a predetermined direction and being joined or contacted to the injection plunger, the screw shaft being configured to rotate to move the moving member; and

a fixing unit, configured to hold the injection cylinder and the movable unit, including a first portion for holding a first end part of the screw shaft, a second portion for holding a second end part of the screw shaft, and a third portion for holding the injection cylinder,

wherein the screw shaft and the injection plunger are disposed side by side in a direction orthogonal to the predetermined direction,

wherein the moving member is provided between the first portion and the second portion,

wherein the third portion is provided so as to be pressed by the injection cylinder when the injection plunger presses the resin, and

wherein the injection cylinder is located inside the fixing unit,

wherein the injection plunger is configured to press the resin stored in the injection cylinder such that the resin is supplied to the injection nozzle via a flow path,

wherein the injection cylinder is located upstream of the nozzle along the flow path, and

wherein the nozzle is exposed to an outside of the fixing unit.

2 . The injection apparatus according to claim 1 , wherein the fixing unit includes a first rigid member including the first portion, a second rigid member including the second portion, and a third rigid member including the third portion.

3 . The injection apparatus according to claim 2 , wherein the second rigid member is joined to the third rigid member.

4 . The injection apparatus according to claim 3 , further comprising a motor configured to rotate the screw shaft, wherein, in the predetermined direction, the first rigid member is disposed between the motor and the moving member.

5 . The injection apparatus according to claim 2 ,

wherein the fixing unit includes a fourth rigid member joined to the first rigid member and the second rigid member, and

wherein, in the direction orthogonal to the predetermined direction, the screw shaft is disposed between the injection plunger and the fourth rigid member.

6 . The injection apparatus according to claim 5 , wherein the third rigid member is joined to the fourth rigid member.

7 . The injection apparatus according to claim 5 , wherein, in the direction orthogonal to the predetermined direction, the second rigid member is disposed between the injection cylinder and the fourth rigid member.

8 . The injection apparatus according to claim 5 ,

wherein the fixing unit includes a guide member configured to guide the moving member, and

wherein the guide member is joined to the fourth rigid member.

9 . The injection apparatus according to claim 5 ,

wherein the fixing unit includes a guide member configured to guide the moving member, and

wherein, in the direction orthogonal to the predetermined direction, the screw shaft is disposed between the guide member and the fourth rigid member.

10 . The injection apparatus according to claim 5 ,

wherein the fixing unit includes a sixth rigid member,

wherein, in the direction orthogonal to the predetermined direction, the screw shaft and the injection plunger are disposed between the fourth rigid member and the sixth rigid member, and

wherein the first rigid member is joined to the sixth rigid member.

11 . The injection apparatus according to claim 5 ,

wherein the fixing unit includes a fifth rigid member joined to the fourth rigid member, and

wherein, in the predetermined direction, the first rigid member and the second rigid member are disposed between the third rigid member and the fifth rigid member.

12 . The injection apparatus according to claim 11 , wherein the first rigid member is joined to the fifth rigid member.

13 . The injection apparatus according to claim 11 , further comprising a motor configured to rotate the screw shaft, wherein the motor is joined to the fifth rigid member.

14 . The injection apparatus according to claim 11 ,

wherein the fixing unit includes a guide member configured to guide the moving member, and

wherein the guide member is joined to the third rigid member and the fifth rigid member.

15 . The injection apparatus according to claim 2 , wherein, in the predetermined direction, the second rigid member is disposed between the first rigid member and the third rigid member.

16 . The injection apparatus according to claim 2 ,

wherein the first rigid member includes a first bearing as an angular ball bearing, and a bearing holder to which the first bearing is fixed, and

wherein the second rigid member includes a second bearing as a deep-groove ball bearing, and a bearing holder to which the second bearing is fixed.

17 . The injection apparatus according to claim 2 , wherein the first rigid member and the second rigid member are joined to the third rigid member.

18 . The injection apparatus according to claim 1 , further comprising:

a plasticizing cylinder configured to store the resin to be supplied to the injection cylinder; and

a plasticizing screw configured to press the resin stored in the injection cylinder,

wherein, in the direction orthogonal to the predetermined direction, a part of the injection cylinder and a part of the plasticizing cylinder are positioned between the injection plunger and the plasticizing screw, and

wherein the fixing unit holds the plasticizing cylinder.

19 . The injection apparatus according to claim 1 ,

wherein the moving member includes a nut and an injection ram to which the nut is fixed,

wherein, in the predetermined direction, the injection ram and the injection plunger are disposed side by side, and

wherein the injection ram is separable from the injection plunger.

20 . The injection apparatus according to claim 1 ,

wherein the injection plunger is movable in a first direction and a second direction that is opposite of the first direction, and

wherein the third portion is provided so as to be pressed in the first direction by the injection cylinder when the injection plunger presses the resin in the first direction.

21 . A method of manufacturing a resin body, the method comprising injecting a resin from the injection apparatus according to claim 1 into a cavity of a mold, to form the resin body having a shape corresponding to a shape of the cavity.

22 . A method of manufacturing a resin body, the method comprising:

injecting a resin from the injection apparatus according to claim 1 into a first cavity of a mold to form a resin body having a shape corresponding to a shape of the first cavity, the mold including the first cavity and a second cavity; and

injecting a resin from another injection apparatus into the second cavity of the mold to form a resin body having a shape corresponding to a shape of the second cavity.